Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * USB hub driver. | |
3 | * | |
4 | * (C) Copyright 1999 Linus Torvalds | |
5 | * (C) Copyright 1999 Johannes Erdfelt | |
6 | * (C) Copyright 1999 Gregory P. Smith | |
7 | * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) | |
8 | * | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/kernel.h> |
12 | #include <linux/errno.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/moduleparam.h> | |
15 | #include <linux/completion.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/slab.h> | |
1da177e4 LT |
19 | #include <linux/ioctl.h> |
20 | #include <linux/usb.h> | |
21 | #include <linux/usbdevice_fs.h> | |
9c8d6178 | 22 | #include <linux/kthread.h> |
4186ecf8 | 23 | #include <linux/mutex.h> |
7dfb7103 | 24 | #include <linux/freezer.h> |
1da177e4 | 25 | |
1da177e4 LT |
26 | #include <asm/uaccess.h> |
27 | #include <asm/byteorder.h> | |
28 | ||
29 | #include "usb.h" | |
30 | #include "hcd.h" | |
31 | #include "hub.h" | |
32 | ||
f2a383e4 GKH |
33 | /* if we are in debug mode, always announce new devices */ |
34 | #ifdef DEBUG | |
35 | #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES | |
36 | #define CONFIG_USB_ANNOUNCE_NEW_DEVICES | |
37 | #endif | |
38 | #endif | |
39 | ||
1bb5f66b AS |
40 | struct usb_hub { |
41 | struct device *intfdev; /* the "interface" device */ | |
42 | struct usb_device *hdev; | |
e8054854 | 43 | struct kref kref; |
1bb5f66b AS |
44 | struct urb *urb; /* for interrupt polling pipe */ |
45 | ||
46 | /* buffer for urb ... with extra space in case of babble */ | |
47 | char (*buffer)[8]; | |
48 | dma_addr_t buffer_dma; /* DMA address for buffer */ | |
49 | union { | |
50 | struct usb_hub_status hub; | |
51 | struct usb_port_status port; | |
52 | } *status; /* buffer for status reports */ | |
db90e7a1 | 53 | struct mutex status_mutex; /* for the status buffer */ |
1bb5f66b AS |
54 | |
55 | int error; /* last reported error */ | |
56 | int nerrors; /* track consecutive errors */ | |
57 | ||
58 | struct list_head event_list; /* hubs w/data or errs ready */ | |
59 | unsigned long event_bits[1]; /* status change bitmask */ | |
60 | unsigned long change_bits[1]; /* ports with logical connect | |
61 | status change */ | |
62 | unsigned long busy_bits[1]; /* ports being reset or | |
63 | resumed */ | |
64 | #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ | |
65 | #error event_bits[] is too short! | |
66 | #endif | |
67 | ||
68 | struct usb_hub_descriptor *descriptor; /* class descriptor */ | |
69 | struct usb_tt tt; /* Transaction Translator */ | |
70 | ||
71 | unsigned mA_per_port; /* current for each child */ | |
72 | ||
73 | unsigned limited_power:1; | |
74 | unsigned quiescing:1; | |
e8054854 | 75 | unsigned disconnected:1; |
1bb5f66b AS |
76 | |
77 | unsigned has_indicators:1; | |
78 | u8 indicator[USB_MAXCHILDREN]; | |
6d5aefb8 | 79 | struct delayed_work leds; |
8520f380 | 80 | struct delayed_work init_work; |
1bb5f66b AS |
81 | }; |
82 | ||
83 | ||
1da177e4 | 84 | /* Protect struct usb_device->state and ->children members |
9ad3d6cc | 85 | * Note: Both are also protected by ->dev.sem, except that ->state can |
1da177e4 LT |
86 | * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
87 | static DEFINE_SPINLOCK(device_state_lock); | |
88 | ||
89 | /* khubd's worklist and its lock */ | |
90 | static DEFINE_SPINLOCK(hub_event_lock); | |
91 | static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ | |
92 | ||
93 | /* Wakes up khubd */ | |
94 | static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); | |
95 | ||
9c8d6178 | 96 | static struct task_struct *khubd_task; |
1da177e4 LT |
97 | |
98 | /* cycle leds on hubs that aren't blinking for attention */ | |
99 | static int blinkenlights = 0; | |
100 | module_param (blinkenlights, bool, S_IRUGO); | |
101 | MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); | |
102 | ||
fd7c519d JK |
103 | /* |
104 | * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about | |
105 | * 10 seconds to send reply for the initial 64-byte descriptor request. | |
106 | */ | |
107 | /* define initial 64-byte descriptor request timeout in milliseconds */ | |
108 | static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; | |
109 | module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); | |
b9cef6c3 WF |
110 | MODULE_PARM_DESC(initial_descriptor_timeout, |
111 | "initial 64-byte descriptor request timeout in milliseconds " | |
112 | "(default 5000 - 5.0 seconds)"); | |
fd7c519d | 113 | |
1da177e4 LT |
114 | /* |
115 | * As of 2.6.10 we introduce a new USB device initialization scheme which | |
116 | * closely resembles the way Windows works. Hopefully it will be compatible | |
117 | * with a wider range of devices than the old scheme. However some previously | |
118 | * working devices may start giving rise to "device not accepting address" | |
119 | * errors; if that happens the user can try the old scheme by adjusting the | |
120 | * following module parameters. | |
121 | * | |
122 | * For maximum flexibility there are two boolean parameters to control the | |
123 | * hub driver's behavior. On the first initialization attempt, if the | |
124 | * "old_scheme_first" parameter is set then the old scheme will be used, | |
125 | * otherwise the new scheme is used. If that fails and "use_both_schemes" | |
126 | * is set, then the driver will make another attempt, using the other scheme. | |
127 | */ | |
128 | static int old_scheme_first = 0; | |
129 | module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); | |
130 | MODULE_PARM_DESC(old_scheme_first, | |
131 | "start with the old device initialization scheme"); | |
132 | ||
133 | static int use_both_schemes = 1; | |
134 | module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); | |
135 | MODULE_PARM_DESC(use_both_schemes, | |
136 | "try the other device initialization scheme if the " | |
137 | "first one fails"); | |
138 | ||
32fe0198 AS |
139 | /* Mutual exclusion for EHCI CF initialization. This interferes with |
140 | * port reset on some companion controllers. | |
141 | */ | |
142 | DECLARE_RWSEM(ehci_cf_port_reset_rwsem); | |
143 | EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); | |
144 | ||
948fea37 AS |
145 | #define HUB_DEBOUNCE_TIMEOUT 1500 |
146 | #define HUB_DEBOUNCE_STEP 25 | |
147 | #define HUB_DEBOUNCE_STABLE 100 | |
148 | ||
1da177e4 | 149 | |
742120c6 ML |
150 | static int usb_reset_and_verify_device(struct usb_device *udev); |
151 | ||
404d5b18 | 152 | static inline char *portspeed(int portstatus) |
1da177e4 LT |
153 | { |
154 | if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) | |
155 | return "480 Mb/s"; | |
156 | else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) | |
157 | return "1.5 Mb/s"; | |
d2e9b4d6 SS |
158 | else if (portstatus & (1 << USB_PORT_FEAT_SUPERSPEED)) |
159 | return "5.0 Gb/s"; | |
1da177e4 LT |
160 | else |
161 | return "12 Mb/s"; | |
162 | } | |
1da177e4 LT |
163 | |
164 | /* Note that hdev or one of its children must be locked! */ | |
165 | static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev) | |
166 | { | |
167 | return usb_get_intfdata(hdev->actconfig->interface[0]); | |
168 | } | |
169 | ||
170 | /* USB 2.0 spec Section 11.24.4.5 */ | |
171 | static int get_hub_descriptor(struct usb_device *hdev, void *data, int size) | |
172 | { | |
173 | int i, ret; | |
174 | ||
175 | for (i = 0; i < 3; i++) { | |
176 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
177 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, | |
178 | USB_DT_HUB << 8, 0, data, size, | |
179 | USB_CTRL_GET_TIMEOUT); | |
180 | if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) | |
181 | return ret; | |
182 | } | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
186 | /* | |
187 | * USB 2.0 spec Section 11.24.2.1 | |
188 | */ | |
189 | static int clear_hub_feature(struct usb_device *hdev, int feature) | |
190 | { | |
191 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
192 | USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); | |
193 | } | |
194 | ||
195 | /* | |
196 | * USB 2.0 spec Section 11.24.2.2 | |
197 | */ | |
198 | static int clear_port_feature(struct usb_device *hdev, int port1, int feature) | |
199 | { | |
200 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
201 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, | |
202 | NULL, 0, 1000); | |
203 | } | |
204 | ||
205 | /* | |
206 | * USB 2.0 spec Section 11.24.2.13 | |
207 | */ | |
208 | static int set_port_feature(struct usb_device *hdev, int port1, int feature) | |
209 | { | |
210 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
211 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, | |
212 | NULL, 0, 1000); | |
213 | } | |
214 | ||
215 | /* | |
216 | * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 | |
217 | * for info about using port indicators | |
218 | */ | |
219 | static void set_port_led( | |
220 | struct usb_hub *hub, | |
221 | int port1, | |
222 | int selector | |
223 | ) | |
224 | { | |
225 | int status = set_port_feature(hub->hdev, (selector << 8) | port1, | |
226 | USB_PORT_FEAT_INDICATOR); | |
227 | if (status < 0) | |
228 | dev_dbg (hub->intfdev, | |
229 | "port %d indicator %s status %d\n", | |
230 | port1, | |
231 | ({ char *s; switch (selector) { | |
232 | case HUB_LED_AMBER: s = "amber"; break; | |
233 | case HUB_LED_GREEN: s = "green"; break; | |
234 | case HUB_LED_OFF: s = "off"; break; | |
235 | case HUB_LED_AUTO: s = "auto"; break; | |
236 | default: s = "??"; break; | |
237 | }; s; }), | |
238 | status); | |
239 | } | |
240 | ||
241 | #define LED_CYCLE_PERIOD ((2*HZ)/3) | |
242 | ||
c4028958 | 243 | static void led_work (struct work_struct *work) |
1da177e4 | 244 | { |
c4028958 DH |
245 | struct usb_hub *hub = |
246 | container_of(work, struct usb_hub, leds.work); | |
1da177e4 LT |
247 | struct usb_device *hdev = hub->hdev; |
248 | unsigned i; | |
249 | unsigned changed = 0; | |
250 | int cursor = -1; | |
251 | ||
252 | if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) | |
253 | return; | |
254 | ||
255 | for (i = 0; i < hub->descriptor->bNbrPorts; i++) { | |
256 | unsigned selector, mode; | |
257 | ||
258 | /* 30%-50% duty cycle */ | |
259 | ||
260 | switch (hub->indicator[i]) { | |
261 | /* cycle marker */ | |
262 | case INDICATOR_CYCLE: | |
263 | cursor = i; | |
264 | selector = HUB_LED_AUTO; | |
265 | mode = INDICATOR_AUTO; | |
266 | break; | |
267 | /* blinking green = sw attention */ | |
268 | case INDICATOR_GREEN_BLINK: | |
269 | selector = HUB_LED_GREEN; | |
270 | mode = INDICATOR_GREEN_BLINK_OFF; | |
271 | break; | |
272 | case INDICATOR_GREEN_BLINK_OFF: | |
273 | selector = HUB_LED_OFF; | |
274 | mode = INDICATOR_GREEN_BLINK; | |
275 | break; | |
276 | /* blinking amber = hw attention */ | |
277 | case INDICATOR_AMBER_BLINK: | |
278 | selector = HUB_LED_AMBER; | |
279 | mode = INDICATOR_AMBER_BLINK_OFF; | |
280 | break; | |
281 | case INDICATOR_AMBER_BLINK_OFF: | |
282 | selector = HUB_LED_OFF; | |
283 | mode = INDICATOR_AMBER_BLINK; | |
284 | break; | |
285 | /* blink green/amber = reserved */ | |
286 | case INDICATOR_ALT_BLINK: | |
287 | selector = HUB_LED_GREEN; | |
288 | mode = INDICATOR_ALT_BLINK_OFF; | |
289 | break; | |
290 | case INDICATOR_ALT_BLINK_OFF: | |
291 | selector = HUB_LED_AMBER; | |
292 | mode = INDICATOR_ALT_BLINK; | |
293 | break; | |
294 | default: | |
295 | continue; | |
296 | } | |
297 | if (selector != HUB_LED_AUTO) | |
298 | changed = 1; | |
299 | set_port_led(hub, i + 1, selector); | |
300 | hub->indicator[i] = mode; | |
301 | } | |
302 | if (!changed && blinkenlights) { | |
303 | cursor++; | |
304 | cursor %= hub->descriptor->bNbrPorts; | |
305 | set_port_led(hub, cursor + 1, HUB_LED_GREEN); | |
306 | hub->indicator[cursor] = INDICATOR_CYCLE; | |
307 | changed++; | |
308 | } | |
309 | if (changed) | |
310 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
311 | } | |
312 | ||
313 | /* use a short timeout for hub/port status fetches */ | |
314 | #define USB_STS_TIMEOUT 1000 | |
315 | #define USB_STS_RETRIES 5 | |
316 | ||
317 | /* | |
318 | * USB 2.0 spec Section 11.24.2.6 | |
319 | */ | |
320 | static int get_hub_status(struct usb_device *hdev, | |
321 | struct usb_hub_status *data) | |
322 | { | |
323 | int i, status = -ETIMEDOUT; | |
324 | ||
325 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { | |
326 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
327 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, | |
328 | data, sizeof(*data), USB_STS_TIMEOUT); | |
329 | } | |
330 | return status; | |
331 | } | |
332 | ||
333 | /* | |
334 | * USB 2.0 spec Section 11.24.2.7 | |
335 | */ | |
336 | static int get_port_status(struct usb_device *hdev, int port1, | |
337 | struct usb_port_status *data) | |
338 | { | |
339 | int i, status = -ETIMEDOUT; | |
340 | ||
341 | for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) { | |
342 | status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
343 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, | |
344 | data, sizeof(*data), USB_STS_TIMEOUT); | |
345 | } | |
346 | return status; | |
347 | } | |
348 | ||
3eb14915 AS |
349 | static int hub_port_status(struct usb_hub *hub, int port1, |
350 | u16 *status, u16 *change) | |
351 | { | |
352 | int ret; | |
353 | ||
354 | mutex_lock(&hub->status_mutex); | |
355 | ret = get_port_status(hub->hdev, port1, &hub->status->port); | |
356 | if (ret < 4) { | |
357 | dev_err(hub->intfdev, | |
358 | "%s failed (err = %d)\n", __func__, ret); | |
359 | if (ret >= 0) | |
360 | ret = -EIO; | |
361 | } else { | |
362 | *status = le16_to_cpu(hub->status->port.wPortStatus); | |
363 | *change = le16_to_cpu(hub->status->port.wPortChange); | |
364 | ret = 0; | |
365 | } | |
366 | mutex_unlock(&hub->status_mutex); | |
367 | return ret; | |
368 | } | |
369 | ||
1da177e4 LT |
370 | static void kick_khubd(struct usb_hub *hub) |
371 | { | |
372 | unsigned long flags; | |
373 | ||
40f122f3 AS |
374 | /* Suppress autosuspend until khubd runs */ |
375 | to_usb_interface(hub->intfdev)->pm_usage_cnt = 1; | |
376 | ||
1da177e4 | 377 | spin_lock_irqsave(&hub_event_lock, flags); |
2e2c5eea | 378 | if (!hub->disconnected && list_empty(&hub->event_list)) { |
1da177e4 LT |
379 | list_add_tail(&hub->event_list, &hub_event_list); |
380 | wake_up(&khubd_wait); | |
381 | } | |
382 | spin_unlock_irqrestore(&hub_event_lock, flags); | |
383 | } | |
384 | ||
385 | void usb_kick_khubd(struct usb_device *hdev) | |
386 | { | |
e8054854 | 387 | /* FIXME: What if hdev isn't bound to the hub driver? */ |
1da177e4 LT |
388 | kick_khubd(hdev_to_hub(hdev)); |
389 | } | |
390 | ||
391 | ||
392 | /* completion function, fires on port status changes and various faults */ | |
7d12e780 | 393 | static void hub_irq(struct urb *urb) |
1da177e4 | 394 | { |
ec17cf1c | 395 | struct usb_hub *hub = urb->context; |
e015268d | 396 | int status = urb->status; |
71d2718f | 397 | unsigned i; |
1da177e4 LT |
398 | unsigned long bits; |
399 | ||
e015268d | 400 | switch (status) { |
1da177e4 LT |
401 | case -ENOENT: /* synchronous unlink */ |
402 | case -ECONNRESET: /* async unlink */ | |
403 | case -ESHUTDOWN: /* hardware going away */ | |
404 | return; | |
405 | ||
406 | default: /* presumably an error */ | |
407 | /* Cause a hub reset after 10 consecutive errors */ | |
e015268d | 408 | dev_dbg (hub->intfdev, "transfer --> %d\n", status); |
1da177e4 LT |
409 | if ((++hub->nerrors < 10) || hub->error) |
410 | goto resubmit; | |
e015268d | 411 | hub->error = status; |
1da177e4 | 412 | /* FALL THROUGH */ |
ec17cf1c | 413 | |
1da177e4 LT |
414 | /* let khubd handle things */ |
415 | case 0: /* we got data: port status changed */ | |
416 | bits = 0; | |
417 | for (i = 0; i < urb->actual_length; ++i) | |
418 | bits |= ((unsigned long) ((*hub->buffer)[i])) | |
419 | << (i*8); | |
420 | hub->event_bits[0] = bits; | |
421 | break; | |
422 | } | |
423 | ||
424 | hub->nerrors = 0; | |
425 | ||
426 | /* Something happened, let khubd figure it out */ | |
427 | kick_khubd(hub); | |
428 | ||
429 | resubmit: | |
430 | if (hub->quiescing) | |
431 | return; | |
432 | ||
433 | if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 | |
434 | && status != -ENODEV && status != -EPERM) | |
435 | dev_err (hub->intfdev, "resubmit --> %d\n", status); | |
436 | } | |
437 | ||
438 | /* USB 2.0 spec Section 11.24.2.3 */ | |
439 | static inline int | |
440 | hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) | |
441 | { | |
442 | return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
443 | HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, | |
444 | tt, NULL, 0, 1000); | |
445 | } | |
446 | ||
447 | /* | |
448 | * enumeration blocks khubd for a long time. we use keventd instead, since | |
449 | * long blocking there is the exception, not the rule. accordingly, HCDs | |
450 | * talking to TTs must queue control transfers (not just bulk and iso), so | |
451 | * both can talk to the same hub concurrently. | |
452 | */ | |
cb88a1b8 | 453 | static void hub_tt_work(struct work_struct *work) |
1da177e4 | 454 | { |
c4028958 | 455 | struct usb_hub *hub = |
cb88a1b8 | 456 | container_of(work, struct usb_hub, tt.clear_work); |
1da177e4 | 457 | unsigned long flags; |
55e5fdfa | 458 | int limit = 100; |
1da177e4 LT |
459 | |
460 | spin_lock_irqsave (&hub->tt.lock, flags); | |
55e5fdfa | 461 | while (--limit && !list_empty (&hub->tt.clear_list)) { |
d0f830d3 | 462 | struct list_head *next; |
1da177e4 LT |
463 | struct usb_tt_clear *clear; |
464 | struct usb_device *hdev = hub->hdev; | |
cb88a1b8 | 465 | const struct hc_driver *drv; |
1da177e4 LT |
466 | int status; |
467 | ||
d0f830d3 HS |
468 | next = hub->tt.clear_list.next; |
469 | clear = list_entry (next, struct usb_tt_clear, clear_list); | |
1da177e4 LT |
470 | list_del (&clear->clear_list); |
471 | ||
472 | /* drop lock so HCD can concurrently report other TT errors */ | |
473 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
474 | status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); | |
1da177e4 LT |
475 | if (status) |
476 | dev_err (&hdev->dev, | |
477 | "clear tt %d (%04x) error %d\n", | |
478 | clear->tt, clear->devinfo, status); | |
cb88a1b8 AS |
479 | |
480 | /* Tell the HCD, even if the operation failed */ | |
481 | drv = clear->hcd->driver; | |
482 | if (drv->clear_tt_buffer_complete) | |
483 | (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); | |
484 | ||
1bc3c9e1 | 485 | kfree(clear); |
cb88a1b8 | 486 | spin_lock_irqsave(&hub->tt.lock, flags); |
1da177e4 LT |
487 | } |
488 | spin_unlock_irqrestore (&hub->tt.lock, flags); | |
489 | } | |
490 | ||
491 | /** | |
cb88a1b8 AS |
492 | * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub |
493 | * @urb: an URB associated with the failed or incomplete split transaction | |
1da177e4 LT |
494 | * |
495 | * High speed HCDs use this to tell the hub driver that some split control or | |
496 | * bulk transaction failed in a way that requires clearing internal state of | |
497 | * a transaction translator. This is normally detected (and reported) from | |
498 | * interrupt context. | |
499 | * | |
500 | * It may not be possible for that hub to handle additional full (or low) | |
501 | * speed transactions until that state is fully cleared out. | |
502 | */ | |
cb88a1b8 | 503 | int usb_hub_clear_tt_buffer(struct urb *urb) |
1da177e4 | 504 | { |
cb88a1b8 AS |
505 | struct usb_device *udev = urb->dev; |
506 | int pipe = urb->pipe; | |
1da177e4 LT |
507 | struct usb_tt *tt = udev->tt; |
508 | unsigned long flags; | |
509 | struct usb_tt_clear *clear; | |
510 | ||
511 | /* we've got to cope with an arbitrary number of pending TT clears, | |
512 | * since each TT has "at least two" buffers that can need it (and | |
513 | * there can be many TTs per hub). even if they're uncommon. | |
514 | */ | |
54e6ecb2 | 515 | if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { |
1da177e4 LT |
516 | dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
517 | /* FIXME recover somehow ... RESET_TT? */ | |
cb88a1b8 | 518 | return -ENOMEM; |
1da177e4 LT |
519 | } |
520 | ||
521 | /* info that CLEAR_TT_BUFFER needs */ | |
522 | clear->tt = tt->multi ? udev->ttport : 1; | |
523 | clear->devinfo = usb_pipeendpoint (pipe); | |
524 | clear->devinfo |= udev->devnum << 4; | |
525 | clear->devinfo |= usb_pipecontrol (pipe) | |
526 | ? (USB_ENDPOINT_XFER_CONTROL << 11) | |
527 | : (USB_ENDPOINT_XFER_BULK << 11); | |
528 | if (usb_pipein (pipe)) | |
529 | clear->devinfo |= 1 << 15; | |
cb88a1b8 AS |
530 | |
531 | /* info for completion callback */ | |
532 | clear->hcd = bus_to_hcd(udev->bus); | |
533 | clear->ep = urb->ep; | |
534 | ||
1da177e4 LT |
535 | /* tell keventd to clear state for this TT */ |
536 | spin_lock_irqsave (&tt->lock, flags); | |
537 | list_add_tail (&clear->clear_list, &tt->clear_list); | |
cb88a1b8 | 538 | schedule_work(&tt->clear_work); |
1da177e4 | 539 | spin_unlock_irqrestore (&tt->lock, flags); |
cb88a1b8 | 540 | return 0; |
1da177e4 | 541 | } |
cb88a1b8 | 542 | EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); |
1da177e4 | 543 | |
8520f380 AS |
544 | /* If do_delay is false, return the number of milliseconds the caller |
545 | * needs to delay. | |
546 | */ | |
547 | static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) | |
1da177e4 LT |
548 | { |
549 | int port1; | |
b789696a | 550 | unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; |
8520f380 | 551 | unsigned delay; |
4489a571 AS |
552 | u16 wHubCharacteristics = |
553 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
554 | ||
555 | /* Enable power on each port. Some hubs have reserved values | |
556 | * of LPSM (> 2) in their descriptors, even though they are | |
557 | * USB 2.0 hubs. Some hubs do not implement port-power switching | |
558 | * but only emulate it. In all cases, the ports won't work | |
559 | * unless we send these messages to the hub. | |
560 | */ | |
561 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) | |
1da177e4 | 562 | dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
4489a571 AS |
563 | else |
564 | dev_dbg(hub->intfdev, "trying to enable port power on " | |
565 | "non-switchable hub\n"); | |
566 | for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++) | |
567 | set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); | |
1da177e4 | 568 | |
b789696a | 569 | /* Wait at least 100 msec for power to become stable */ |
8520f380 AS |
570 | delay = max(pgood_delay, (unsigned) 100); |
571 | if (do_delay) | |
572 | msleep(delay); | |
573 | return delay; | |
1da177e4 LT |
574 | } |
575 | ||
1da177e4 LT |
576 | static int hub_hub_status(struct usb_hub *hub, |
577 | u16 *status, u16 *change) | |
578 | { | |
579 | int ret; | |
580 | ||
db90e7a1 | 581 | mutex_lock(&hub->status_mutex); |
1da177e4 LT |
582 | ret = get_hub_status(hub->hdev, &hub->status->hub); |
583 | if (ret < 0) | |
584 | dev_err (hub->intfdev, | |
441b62c1 | 585 | "%s failed (err = %d)\n", __func__, ret); |
1da177e4 LT |
586 | else { |
587 | *status = le16_to_cpu(hub->status->hub.wHubStatus); | |
588 | *change = le16_to_cpu(hub->status->hub.wHubChange); | |
589 | ret = 0; | |
590 | } | |
db90e7a1 | 591 | mutex_unlock(&hub->status_mutex); |
1da177e4 LT |
592 | return ret; |
593 | } | |
594 | ||
8b28c752 AS |
595 | static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
596 | { | |
597 | struct usb_device *hdev = hub->hdev; | |
0458d5b4 | 598 | int ret = 0; |
8b28c752 | 599 | |
0458d5b4 | 600 | if (hdev->children[port1-1] && set_state) |
8b28c752 AS |
601 | usb_set_device_state(hdev->children[port1-1], |
602 | USB_STATE_NOTATTACHED); | |
0458d5b4 AS |
603 | if (!hub->error) |
604 | ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); | |
8b28c752 AS |
605 | if (ret) |
606 | dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", | |
0458d5b4 | 607 | port1, ret); |
8b28c752 AS |
608 | return ret; |
609 | } | |
610 | ||
0458d5b4 AS |
611 | /* |
612 | * Disable a port and mark a logical connnect-change event, so that some | |
613 | * time later khubd will disconnect() any existing usb_device on the port | |
614 | * and will re-enumerate if there actually is a device attached. | |
615 | */ | |
616 | static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) | |
617 | { | |
618 | dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); | |
619 | hub_port_disable(hub, port1, 1); | |
7d069b7d | 620 | |
0458d5b4 AS |
621 | /* FIXME let caller ask to power down the port: |
622 | * - some devices won't enumerate without a VBUS power cycle | |
623 | * - SRP saves power that way | |
624 | * - ... new call, TBD ... | |
625 | * That's easy if this hub can switch power per-port, and | |
626 | * khubd reactivates the port later (timer, SRP, etc). | |
627 | * Powerdown must be optional, because of reset/DFU. | |
628 | */ | |
629 | ||
630 | set_bit(port1, hub->change_bits); | |
631 | kick_khubd(hub); | |
632 | } | |
633 | ||
6ee0b270 | 634 | enum hub_activation_type { |
8520f380 AS |
635 | HUB_INIT, HUB_INIT2, HUB_INIT3, |
636 | HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, | |
6ee0b270 | 637 | }; |
5e6effae | 638 | |
8520f380 AS |
639 | static void hub_init_func2(struct work_struct *ws); |
640 | static void hub_init_func3(struct work_struct *ws); | |
641 | ||
f2835219 | 642 | static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) |
5e6effae AS |
643 | { |
644 | struct usb_device *hdev = hub->hdev; | |
645 | int port1; | |
f2835219 | 646 | int status; |
948fea37 | 647 | bool need_debounce_delay = false; |
8520f380 AS |
648 | unsigned delay; |
649 | ||
650 | /* Continue a partial initialization */ | |
651 | if (type == HUB_INIT2) | |
652 | goto init2; | |
653 | if (type == HUB_INIT3) | |
654 | goto init3; | |
5e6effae | 655 | |
f2835219 AS |
656 | /* After a resume, port power should still be on. |
657 | * For any other type of activation, turn it on. | |
658 | */ | |
8520f380 AS |
659 | if (type != HUB_RESUME) { |
660 | ||
661 | /* Speed up system boot by using a delayed_work for the | |
662 | * hub's initial power-up delays. This is pretty awkward | |
663 | * and the implementation looks like a home-brewed sort of | |
664 | * setjmp/longjmp, but it saves at least 100 ms for each | |
665 | * root hub (assuming usbcore is compiled into the kernel | |
666 | * rather than as a module). It adds up. | |
667 | * | |
668 | * This can't be done for HUB_RESUME or HUB_RESET_RESUME | |
669 | * because for those activation types the ports have to be | |
670 | * operational when we return. In theory this could be done | |
671 | * for HUB_POST_RESET, but it's easier not to. | |
672 | */ | |
673 | if (type == HUB_INIT) { | |
674 | delay = hub_power_on(hub, false); | |
675 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2); | |
676 | schedule_delayed_work(&hub->init_work, | |
677 | msecs_to_jiffies(delay)); | |
61fbeba1 AS |
678 | |
679 | /* Suppress autosuspend until init is done */ | |
680 | to_usb_interface(hub->intfdev)->pm_usage_cnt = 1; | |
8520f380 AS |
681 | return; /* Continues at init2: below */ |
682 | } else { | |
683 | hub_power_on(hub, true); | |
684 | } | |
685 | } | |
686 | init2: | |
f2835219 | 687 | |
6ee0b270 AS |
688 | /* Check each port and set hub->change_bits to let khubd know |
689 | * which ports need attention. | |
5e6effae AS |
690 | */ |
691 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
692 | struct usb_device *udev = hdev->children[port1-1]; | |
5e6effae AS |
693 | u16 portstatus, portchange; |
694 | ||
6ee0b270 AS |
695 | portstatus = portchange = 0; |
696 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
697 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
698 | dev_dbg(hub->intfdev, | |
699 | "port %d: status %04x change %04x\n", | |
700 | port1, portstatus, portchange); | |
701 | ||
702 | /* After anything other than HUB_RESUME (i.e., initialization | |
703 | * or any sort of reset), every port should be disabled. | |
704 | * Unconnected ports should likewise be disabled (paranoia), | |
705 | * and so should ports for which we have no usb_device. | |
706 | */ | |
707 | if ((portstatus & USB_PORT_STAT_ENABLE) && ( | |
708 | type != HUB_RESUME || | |
709 | !(portstatus & USB_PORT_STAT_CONNECTION) || | |
710 | !udev || | |
711 | udev->state == USB_STATE_NOTATTACHED)) { | |
712 | clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); | |
713 | portstatus &= ~USB_PORT_STAT_ENABLE; | |
5e6effae AS |
714 | } |
715 | ||
948fea37 AS |
716 | /* Clear status-change flags; we'll debounce later */ |
717 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
718 | need_debounce_delay = true; | |
719 | clear_port_feature(hub->hdev, port1, | |
720 | USB_PORT_FEAT_C_CONNECTION); | |
721 | } | |
722 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
723 | need_debounce_delay = true; | |
724 | clear_port_feature(hub->hdev, port1, | |
725 | USB_PORT_FEAT_C_ENABLE); | |
726 | } | |
727 | ||
6ee0b270 AS |
728 | if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
729 | /* Tell khubd to disconnect the device or | |
730 | * check for a new connection | |
731 | */ | |
732 | if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) | |
733 | set_bit(port1, hub->change_bits); | |
734 | ||
735 | } else if (portstatus & USB_PORT_STAT_ENABLE) { | |
736 | /* The power session apparently survived the resume. | |
737 | * If there was an overcurrent or suspend change | |
738 | * (i.e., remote wakeup request), have khubd | |
739 | * take care of it. | |
740 | */ | |
741 | if (portchange) | |
742 | set_bit(port1, hub->change_bits); | |
5e6effae | 743 | |
6ee0b270 | 744 | } else if (udev->persist_enabled) { |
6ee0b270 | 745 | #ifdef CONFIG_PM |
5e6effae | 746 | udev->reset_resume = 1; |
6ee0b270 | 747 | #endif |
8808f00c AS |
748 | set_bit(port1, hub->change_bits); |
749 | ||
6ee0b270 AS |
750 | } else { |
751 | /* The power session is gone; tell khubd */ | |
752 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
753 | set_bit(port1, hub->change_bits); | |
5e6effae | 754 | } |
5e6effae AS |
755 | } |
756 | ||
948fea37 AS |
757 | /* If no port-status-change flags were set, we don't need any |
758 | * debouncing. If flags were set we can try to debounce the | |
759 | * ports all at once right now, instead of letting khubd do them | |
760 | * one at a time later on. | |
761 | * | |
762 | * If any port-status changes do occur during this delay, khubd | |
763 | * will see them later and handle them normally. | |
764 | */ | |
8520f380 AS |
765 | if (need_debounce_delay) { |
766 | delay = HUB_DEBOUNCE_STABLE; | |
767 | ||
768 | /* Don't do a long sleep inside a workqueue routine */ | |
769 | if (type == HUB_INIT2) { | |
770 | PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3); | |
771 | schedule_delayed_work(&hub->init_work, | |
772 | msecs_to_jiffies(delay)); | |
773 | return; /* Continues at init3: below */ | |
774 | } else { | |
775 | msleep(delay); | |
776 | } | |
777 | } | |
778 | init3: | |
f2835219 AS |
779 | hub->quiescing = 0; |
780 | ||
781 | status = usb_submit_urb(hub->urb, GFP_NOIO); | |
782 | if (status < 0) | |
783 | dev_err(hub->intfdev, "activate --> %d\n", status); | |
784 | if (hub->has_indicators && blinkenlights) | |
785 | schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); | |
786 | ||
787 | /* Scan all ports that need attention */ | |
788 | kick_khubd(hub); | |
5e6effae AS |
789 | } |
790 | ||
8520f380 AS |
791 | /* Implement the continuations for the delays above */ |
792 | static void hub_init_func2(struct work_struct *ws) | |
793 | { | |
794 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
795 | ||
796 | hub_activate(hub, HUB_INIT2); | |
797 | } | |
798 | ||
799 | static void hub_init_func3(struct work_struct *ws) | |
800 | { | |
801 | struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); | |
802 | ||
803 | hub_activate(hub, HUB_INIT3); | |
804 | } | |
805 | ||
4330354f AS |
806 | enum hub_quiescing_type { |
807 | HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND | |
808 | }; | |
809 | ||
810 | static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) | |
811 | { | |
812 | struct usb_device *hdev = hub->hdev; | |
813 | int i; | |
814 | ||
8520f380 AS |
815 | cancel_delayed_work_sync(&hub->init_work); |
816 | ||
4330354f AS |
817 | /* khubd and related activity won't re-trigger */ |
818 | hub->quiescing = 1; | |
819 | ||
820 | if (type != HUB_SUSPEND) { | |
821 | /* Disconnect all the children */ | |
822 | for (i = 0; i < hdev->maxchild; ++i) { | |
823 | if (hdev->children[i]) | |
824 | usb_disconnect(&hdev->children[i]); | |
825 | } | |
826 | } | |
827 | ||
828 | /* Stop khubd and related activity */ | |
829 | usb_kill_urb(hub->urb); | |
830 | if (hub->has_indicators) | |
831 | cancel_delayed_work_sync(&hub->leds); | |
832 | if (hub->tt.hub) | |
cb88a1b8 | 833 | cancel_work_sync(&hub->tt.clear_work); |
4330354f AS |
834 | } |
835 | ||
3eb14915 AS |
836 | /* caller has locked the hub device */ |
837 | static int hub_pre_reset(struct usb_interface *intf) | |
838 | { | |
839 | struct usb_hub *hub = usb_get_intfdata(intf); | |
840 | ||
4330354f | 841 | hub_quiesce(hub, HUB_PRE_RESET); |
f07600cf | 842 | return 0; |
7d069b7d AS |
843 | } |
844 | ||
845 | /* caller has locked the hub device */ | |
f07600cf | 846 | static int hub_post_reset(struct usb_interface *intf) |
7d069b7d | 847 | { |
7de18d8b AS |
848 | struct usb_hub *hub = usb_get_intfdata(intf); |
849 | ||
f2835219 | 850 | hub_activate(hub, HUB_POST_RESET); |
f07600cf | 851 | return 0; |
7d069b7d AS |
852 | } |
853 | ||
1da177e4 LT |
854 | static int hub_configure(struct usb_hub *hub, |
855 | struct usb_endpoint_descriptor *endpoint) | |
856 | { | |
857 | struct usb_device *hdev = hub->hdev; | |
858 | struct device *hub_dev = hub->intfdev; | |
859 | u16 hubstatus, hubchange; | |
74ad9bd2 | 860 | u16 wHubCharacteristics; |
1da177e4 LT |
861 | unsigned int pipe; |
862 | int maxp, ret; | |
863 | char *message; | |
864 | ||
865 | hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL, | |
866 | &hub->buffer_dma); | |
867 | if (!hub->buffer) { | |
868 | message = "can't allocate hub irq buffer"; | |
869 | ret = -ENOMEM; | |
870 | goto fail; | |
871 | } | |
872 | ||
873 | hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); | |
874 | if (!hub->status) { | |
875 | message = "can't kmalloc hub status buffer"; | |
876 | ret = -ENOMEM; | |
877 | goto fail; | |
878 | } | |
db90e7a1 | 879 | mutex_init(&hub->status_mutex); |
1da177e4 LT |
880 | |
881 | hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); | |
882 | if (!hub->descriptor) { | |
883 | message = "can't kmalloc hub descriptor"; | |
884 | ret = -ENOMEM; | |
885 | goto fail; | |
886 | } | |
887 | ||
888 | /* Request the entire hub descriptor. | |
889 | * hub->descriptor can handle USB_MAXCHILDREN ports, | |
890 | * but the hub can/will return fewer bytes here. | |
891 | */ | |
892 | ret = get_hub_descriptor(hdev, hub->descriptor, | |
893 | sizeof(*hub->descriptor)); | |
894 | if (ret < 0) { | |
895 | message = "can't read hub descriptor"; | |
896 | goto fail; | |
897 | } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { | |
898 | message = "hub has too many ports!"; | |
899 | ret = -ENODEV; | |
900 | goto fail; | |
901 | } | |
902 | ||
903 | hdev->maxchild = hub->descriptor->bNbrPorts; | |
904 | dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, | |
905 | (hdev->maxchild == 1) ? "" : "s"); | |
906 | ||
74ad9bd2 | 907 | wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
1da177e4 | 908 | |
74ad9bd2 | 909 | if (wHubCharacteristics & HUB_CHAR_COMPOUND) { |
1da177e4 LT |
910 | int i; |
911 | char portstr [USB_MAXCHILDREN + 1]; | |
912 | ||
913 | for (i = 0; i < hdev->maxchild; i++) | |
914 | portstr[i] = hub->descriptor->DeviceRemovable | |
915 | [((i + 1) / 8)] & (1 << ((i + 1) % 8)) | |
916 | ? 'F' : 'R'; | |
917 | portstr[hdev->maxchild] = 0; | |
918 | dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); | |
919 | } else | |
920 | dev_dbg(hub_dev, "standalone hub\n"); | |
921 | ||
74ad9bd2 | 922 | switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
1da177e4 LT |
923 | case 0x00: |
924 | dev_dbg(hub_dev, "ganged power switching\n"); | |
925 | break; | |
926 | case 0x01: | |
927 | dev_dbg(hub_dev, "individual port power switching\n"); | |
928 | break; | |
929 | case 0x02: | |
930 | case 0x03: | |
931 | dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); | |
932 | break; | |
933 | } | |
934 | ||
74ad9bd2 | 935 | switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
1da177e4 LT |
936 | case 0x00: |
937 | dev_dbg(hub_dev, "global over-current protection\n"); | |
938 | break; | |
939 | case 0x08: | |
940 | dev_dbg(hub_dev, "individual port over-current protection\n"); | |
941 | break; | |
942 | case 0x10: | |
943 | case 0x18: | |
944 | dev_dbg(hub_dev, "no over-current protection\n"); | |
945 | break; | |
946 | } | |
947 | ||
948 | spin_lock_init (&hub->tt.lock); | |
949 | INIT_LIST_HEAD (&hub->tt.clear_list); | |
cb88a1b8 | 950 | INIT_WORK(&hub->tt.clear_work, hub_tt_work); |
1da177e4 LT |
951 | switch (hdev->descriptor.bDeviceProtocol) { |
952 | case 0: | |
953 | break; | |
954 | case 1: | |
955 | dev_dbg(hub_dev, "Single TT\n"); | |
956 | hub->tt.hub = hdev; | |
957 | break; | |
958 | case 2: | |
959 | ret = usb_set_interface(hdev, 0, 1); | |
960 | if (ret == 0) { | |
961 | dev_dbg(hub_dev, "TT per port\n"); | |
962 | hub->tt.multi = 1; | |
963 | } else | |
964 | dev_err(hub_dev, "Using single TT (err %d)\n", | |
965 | ret); | |
966 | hub->tt.hub = hdev; | |
967 | break; | |
d2e9b4d6 SS |
968 | case 3: |
969 | /* USB 3.0 hubs don't have a TT */ | |
970 | break; | |
1da177e4 LT |
971 | default: |
972 | dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", | |
973 | hdev->descriptor.bDeviceProtocol); | |
974 | break; | |
975 | } | |
976 | ||
e09711ae | 977 | /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
74ad9bd2 | 978 | switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
e09711ae | 979 | case HUB_TTTT_8_BITS: |
980 | if (hdev->descriptor.bDeviceProtocol != 0) { | |
981 | hub->tt.think_time = 666; | |
982 | dev_dbg(hub_dev, "TT requires at most %d " | |
983 | "FS bit times (%d ns)\n", | |
984 | 8, hub->tt.think_time); | |
985 | } | |
1da177e4 | 986 | break; |
e09711ae | 987 | case HUB_TTTT_16_BITS: |
988 | hub->tt.think_time = 666 * 2; | |
989 | dev_dbg(hub_dev, "TT requires at most %d " | |
990 | "FS bit times (%d ns)\n", | |
991 | 16, hub->tt.think_time); | |
1da177e4 | 992 | break; |
e09711ae | 993 | case HUB_TTTT_24_BITS: |
994 | hub->tt.think_time = 666 * 3; | |
995 | dev_dbg(hub_dev, "TT requires at most %d " | |
996 | "FS bit times (%d ns)\n", | |
997 | 24, hub->tt.think_time); | |
1da177e4 | 998 | break; |
e09711ae | 999 | case HUB_TTTT_32_BITS: |
1000 | hub->tt.think_time = 666 * 4; | |
1001 | dev_dbg(hub_dev, "TT requires at most %d " | |
1002 | "FS bit times (%d ns)\n", | |
1003 | 32, hub->tt.think_time); | |
1da177e4 LT |
1004 | break; |
1005 | } | |
1006 | ||
1007 | /* probe() zeroes hub->indicator[] */ | |
74ad9bd2 | 1008 | if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
1da177e4 LT |
1009 | hub->has_indicators = 1; |
1010 | dev_dbg(hub_dev, "Port indicators are supported\n"); | |
1011 | } | |
1012 | ||
1013 | dev_dbg(hub_dev, "power on to power good time: %dms\n", | |
1014 | hub->descriptor->bPwrOn2PwrGood * 2); | |
1015 | ||
1016 | /* power budgeting mostly matters with bus-powered hubs, | |
1017 | * and battery-powered root hubs (may provide just 8 mA). | |
1018 | */ | |
1019 | ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); | |
55c52718 | 1020 | if (ret < 2) { |
1da177e4 LT |
1021 | message = "can't get hub status"; |
1022 | goto fail; | |
1023 | } | |
7d35b929 AS |
1024 | le16_to_cpus(&hubstatus); |
1025 | if (hdev == hdev->bus->root_hub) { | |
55c52718 AS |
1026 | if (hdev->bus_mA == 0 || hdev->bus_mA >= 500) |
1027 | hub->mA_per_port = 500; | |
1028 | else { | |
1029 | hub->mA_per_port = hdev->bus_mA; | |
1030 | hub->limited_power = 1; | |
1031 | } | |
7d35b929 | 1032 | } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
1da177e4 LT |
1033 | dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
1034 | hub->descriptor->bHubContrCurrent); | |
55c52718 AS |
1035 | hub->limited_power = 1; |
1036 | if (hdev->maxchild > 0) { | |
1037 | int remaining = hdev->bus_mA - | |
1038 | hub->descriptor->bHubContrCurrent; | |
1039 | ||
1040 | if (remaining < hdev->maxchild * 100) | |
1041 | dev_warn(hub_dev, | |
1042 | "insufficient power available " | |
1043 | "to use all downstream ports\n"); | |
1044 | hub->mA_per_port = 100; /* 7.2.1.1 */ | |
1045 | } | |
1046 | } else { /* Self-powered external hub */ | |
1047 | /* FIXME: What about battery-powered external hubs that | |
1048 | * provide less current per port? */ | |
1049 | hub->mA_per_port = 500; | |
7d35b929 | 1050 | } |
55c52718 AS |
1051 | if (hub->mA_per_port < 500) |
1052 | dev_dbg(hub_dev, "%umA bus power budget for each child\n", | |
1053 | hub->mA_per_port); | |
1da177e4 LT |
1054 | |
1055 | ret = hub_hub_status(hub, &hubstatus, &hubchange); | |
1056 | if (ret < 0) { | |
1057 | message = "can't get hub status"; | |
1058 | goto fail; | |
1059 | } | |
1060 | ||
1061 | /* local power status reports aren't always correct */ | |
1062 | if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) | |
1063 | dev_dbg(hub_dev, "local power source is %s\n", | |
1064 | (hubstatus & HUB_STATUS_LOCAL_POWER) | |
1065 | ? "lost (inactive)" : "good"); | |
1066 | ||
74ad9bd2 | 1067 | if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
1da177e4 LT |
1068 | dev_dbg(hub_dev, "%sover-current condition exists\n", |
1069 | (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); | |
1070 | ||
88fafff9 | 1071 | /* set up the interrupt endpoint |
1072 | * We use the EP's maxpacket size instead of (PORTS+1+7)/8 | |
1073 | * bytes as USB2.0[11.12.3] says because some hubs are known | |
1074 | * to send more data (and thus cause overflow). For root hubs, | |
1075 | * maxpktsize is defined in hcd.c's fake endpoint descriptors | |
1076 | * to be big enough for at least USB_MAXCHILDREN ports. */ | |
1da177e4 LT |
1077 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
1078 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); | |
1079 | ||
1080 | if (maxp > sizeof(*hub->buffer)) | |
1081 | maxp = sizeof(*hub->buffer); | |
1082 | ||
1083 | hub->urb = usb_alloc_urb(0, GFP_KERNEL); | |
1084 | if (!hub->urb) { | |
1085 | message = "couldn't allocate interrupt urb"; | |
1086 | ret = -ENOMEM; | |
1087 | goto fail; | |
1088 | } | |
1089 | ||
1090 | usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, | |
1091 | hub, endpoint->bInterval); | |
1092 | hub->urb->transfer_dma = hub->buffer_dma; | |
1093 | hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
1094 | ||
1095 | /* maybe cycle the hub leds */ | |
1096 | if (hub->has_indicators && blinkenlights) | |
1097 | hub->indicator [0] = INDICATOR_CYCLE; | |
1098 | ||
f2835219 | 1099 | hub_activate(hub, HUB_INIT); |
1da177e4 LT |
1100 | return 0; |
1101 | ||
1102 | fail: | |
1103 | dev_err (hub_dev, "config failed, %s (err %d)\n", | |
1104 | message, ret); | |
1105 | /* hub_disconnect() frees urb and descriptor */ | |
1106 | return ret; | |
1107 | } | |
1108 | ||
e8054854 AS |
1109 | static void hub_release(struct kref *kref) |
1110 | { | |
1111 | struct usb_hub *hub = container_of(kref, struct usb_hub, kref); | |
1112 | ||
1113 | usb_put_intf(to_usb_interface(hub->intfdev)); | |
1114 | kfree(hub); | |
1115 | } | |
1116 | ||
1da177e4 LT |
1117 | static unsigned highspeed_hubs; |
1118 | ||
1119 | static void hub_disconnect(struct usb_interface *intf) | |
1120 | { | |
1121 | struct usb_hub *hub = usb_get_intfdata (intf); | |
e8054854 AS |
1122 | |
1123 | /* Take the hub off the event list and don't let it be added again */ | |
1124 | spin_lock_irq(&hub_event_lock); | |
1125 | list_del_init(&hub->event_list); | |
1126 | hub->disconnected = 1; | |
1127 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 1128 | |
7de18d8b AS |
1129 | /* Disconnect all children and quiesce the hub */ |
1130 | hub->error = 0; | |
4330354f | 1131 | hub_quiesce(hub, HUB_DISCONNECT); |
7de18d8b | 1132 | |
8b28c752 | 1133 | usb_set_intfdata (intf, NULL); |
1da177e4 | 1134 | |
e8054854 | 1135 | if (hub->hdev->speed == USB_SPEED_HIGH) |
1da177e4 LT |
1136 | highspeed_hubs--; |
1137 | ||
1da177e4 | 1138 | usb_free_urb(hub->urb); |
1bc3c9e1 | 1139 | kfree(hub->descriptor); |
1bc3c9e1 | 1140 | kfree(hub->status); |
e8054854 AS |
1141 | usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer, |
1142 | hub->buffer_dma); | |
1da177e4 | 1143 | |
e8054854 | 1144 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
1145 | } |
1146 | ||
1147 | static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
1148 | { | |
1149 | struct usb_host_interface *desc; | |
1150 | struct usb_endpoint_descriptor *endpoint; | |
1151 | struct usb_device *hdev; | |
1152 | struct usb_hub *hub; | |
1153 | ||
1154 | desc = intf->cur_altsetting; | |
1155 | hdev = interface_to_usbdev(intf); | |
1156 | ||
38f3ad5e | 1157 | if (hdev->level == MAX_TOPO_LEVEL) { |
b9cef6c3 WF |
1158 | dev_err(&intf->dev, |
1159 | "Unsupported bus topology: hub nested too deep\n"); | |
38f3ad5e FB |
1160 | return -E2BIG; |
1161 | } | |
1162 | ||
89ccbdc9 DB |
1163 | #ifdef CONFIG_USB_OTG_BLACKLIST_HUB |
1164 | if (hdev->parent) { | |
1165 | dev_warn(&intf->dev, "ignoring external hub\n"); | |
1166 | return -ENODEV; | |
1167 | } | |
1168 | #endif | |
1169 | ||
1da177e4 LT |
1170 | /* Some hubs have a subclass of 1, which AFAICT according to the */ |
1171 | /* specs is not defined, but it works */ | |
1172 | if ((desc->desc.bInterfaceSubClass != 0) && | |
1173 | (desc->desc.bInterfaceSubClass != 1)) { | |
1174 | descriptor_error: | |
1175 | dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); | |
1176 | return -EIO; | |
1177 | } | |
1178 | ||
1179 | /* Multiple endpoints? What kind of mutant ninja-hub is this? */ | |
1180 | if (desc->desc.bNumEndpoints != 1) | |
1181 | goto descriptor_error; | |
1182 | ||
1183 | endpoint = &desc->endpoint[0].desc; | |
1184 | ||
fbf81c29 LFC |
1185 | /* If it's not an interrupt in endpoint, we'd better punt! */ |
1186 | if (!usb_endpoint_is_int_in(endpoint)) | |
1da177e4 LT |
1187 | goto descriptor_error; |
1188 | ||
1189 | /* We found a hub */ | |
1190 | dev_info (&intf->dev, "USB hub found\n"); | |
1191 | ||
0a1ef3b5 | 1192 | hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
1da177e4 LT |
1193 | if (!hub) { |
1194 | dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); | |
1195 | return -ENOMEM; | |
1196 | } | |
1197 | ||
e8054854 | 1198 | kref_init(&hub->kref); |
1da177e4 LT |
1199 | INIT_LIST_HEAD(&hub->event_list); |
1200 | hub->intfdev = &intf->dev; | |
1201 | hub->hdev = hdev; | |
c4028958 | 1202 | INIT_DELAYED_WORK(&hub->leds, led_work); |
8520f380 | 1203 | INIT_DELAYED_WORK(&hub->init_work, NULL); |
e8054854 | 1204 | usb_get_intf(intf); |
1da177e4 LT |
1205 | |
1206 | usb_set_intfdata (intf, hub); | |
40f122f3 | 1207 | intf->needs_remote_wakeup = 1; |
1da177e4 LT |
1208 | |
1209 | if (hdev->speed == USB_SPEED_HIGH) | |
1210 | highspeed_hubs++; | |
1211 | ||
1212 | if (hub_configure(hub, endpoint) >= 0) | |
1213 | return 0; | |
1214 | ||
1215 | hub_disconnect (intf); | |
1216 | return -ENODEV; | |
1217 | } | |
1218 | ||
1219 | static int | |
1220 | hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) | |
1221 | { | |
1222 | struct usb_device *hdev = interface_to_usbdev (intf); | |
1223 | ||
1224 | /* assert ifno == 0 (part of hub spec) */ | |
1225 | switch (code) { | |
1226 | case USBDEVFS_HUB_PORTINFO: { | |
1227 | struct usbdevfs_hub_portinfo *info = user_data; | |
1228 | int i; | |
1229 | ||
1230 | spin_lock_irq(&device_state_lock); | |
1231 | if (hdev->devnum <= 0) | |
1232 | info->nports = 0; | |
1233 | else { | |
1234 | info->nports = hdev->maxchild; | |
1235 | for (i = 0; i < info->nports; i++) { | |
1236 | if (hdev->children[i] == NULL) | |
1237 | info->port[i] = 0; | |
1238 | else | |
1239 | info->port[i] = | |
1240 | hdev->children[i]->devnum; | |
1241 | } | |
1242 | } | |
1243 | spin_unlock_irq(&device_state_lock); | |
1244 | ||
1245 | return info->nports + 1; | |
1246 | } | |
1247 | ||
1248 | default: | |
1249 | return -ENOSYS; | |
1250 | } | |
1251 | } | |
1252 | ||
1da177e4 | 1253 | |
1da177e4 LT |
1254 | static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
1255 | { | |
1256 | int i; | |
1257 | ||
1258 | for (i = 0; i < udev->maxchild; ++i) { | |
1259 | if (udev->children[i]) | |
1260 | recursively_mark_NOTATTACHED(udev->children[i]); | |
1261 | } | |
15123006 | 1262 | if (udev->state == USB_STATE_SUSPENDED) { |
ee49fb5d | 1263 | udev->discon_suspended = 1; |
15123006 SS |
1264 | udev->active_duration -= jiffies; |
1265 | } | |
1da177e4 LT |
1266 | udev->state = USB_STATE_NOTATTACHED; |
1267 | } | |
1268 | ||
1269 | /** | |
1270 | * usb_set_device_state - change a device's current state (usbcore, hcds) | |
1271 | * @udev: pointer to device whose state should be changed | |
1272 | * @new_state: new state value to be stored | |
1273 | * | |
1274 | * udev->state is _not_ fully protected by the device lock. Although | |
1275 | * most transitions are made only while holding the lock, the state can | |
1276 | * can change to USB_STATE_NOTATTACHED at almost any time. This | |
1277 | * is so that devices can be marked as disconnected as soon as possible, | |
1278 | * without having to wait for any semaphores to be released. As a result, | |
1279 | * all changes to any device's state must be protected by the | |
1280 | * device_state_lock spinlock. | |
1281 | * | |
1282 | * Once a device has been added to the device tree, all changes to its state | |
1283 | * should be made using this routine. The state should _not_ be set directly. | |
1284 | * | |
1285 | * If udev->state is already USB_STATE_NOTATTACHED then no change is made. | |
1286 | * Otherwise udev->state is set to new_state, and if new_state is | |
1287 | * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set | |
1288 | * to USB_STATE_NOTATTACHED. | |
1289 | */ | |
1290 | void usb_set_device_state(struct usb_device *udev, | |
1291 | enum usb_device_state new_state) | |
1292 | { | |
1293 | unsigned long flags; | |
1294 | ||
1295 | spin_lock_irqsave(&device_state_lock, flags); | |
1296 | if (udev->state == USB_STATE_NOTATTACHED) | |
1297 | ; /* do nothing */ | |
b94dc6b5 | 1298 | else if (new_state != USB_STATE_NOTATTACHED) { |
fb669cc0 DB |
1299 | |
1300 | /* root hub wakeup capabilities are managed out-of-band | |
1301 | * and may involve silicon errata ... ignore them here. | |
1302 | */ | |
1303 | if (udev->parent) { | |
645daaab AS |
1304 | if (udev->state == USB_STATE_SUSPENDED |
1305 | || new_state == USB_STATE_SUSPENDED) | |
1306 | ; /* No change to wakeup settings */ | |
1307 | else if (new_state == USB_STATE_CONFIGURED) | |
fb669cc0 DB |
1308 | device_init_wakeup(&udev->dev, |
1309 | (udev->actconfig->desc.bmAttributes | |
1310 | & USB_CONFIG_ATT_WAKEUP)); | |
645daaab | 1311 | else |
fb669cc0 DB |
1312 | device_init_wakeup(&udev->dev, 0); |
1313 | } | |
15123006 SS |
1314 | if (udev->state == USB_STATE_SUSPENDED && |
1315 | new_state != USB_STATE_SUSPENDED) | |
1316 | udev->active_duration -= jiffies; | |
1317 | else if (new_state == USB_STATE_SUSPENDED && | |
1318 | udev->state != USB_STATE_SUSPENDED) | |
1319 | udev->active_duration += jiffies; | |
645daaab | 1320 | udev->state = new_state; |
b94dc6b5 | 1321 | } else |
1da177e4 LT |
1322 | recursively_mark_NOTATTACHED(udev); |
1323 | spin_unlock_irqrestore(&device_state_lock, flags); | |
1324 | } | |
6da9c990 | 1325 | EXPORT_SYMBOL_GPL(usb_set_device_state); |
1da177e4 | 1326 | |
8af548dc IPG |
1327 | /* |
1328 | * WUSB devices are simple: they have no hubs behind, so the mapping | |
1329 | * device <-> virtual port number becomes 1:1. Why? to simplify the | |
1330 | * life of the device connection logic in | |
1331 | * drivers/usb/wusbcore/devconnect.c. When we do the initial secret | |
1332 | * handshake we need to assign a temporary address in the unauthorized | |
1333 | * space. For simplicity we use the first virtual port number found to | |
1334 | * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] | |
1335 | * and that becomes it's address [X < 128] or its unauthorized address | |
1336 | * [X | 0x80]. | |
1337 | * | |
1338 | * We add 1 as an offset to the one-based USB-stack port number | |
1339 | * (zero-based wusb virtual port index) for two reasons: (a) dev addr | |
1340 | * 0 is reserved by USB for default address; (b) Linux's USB stack | |
1341 | * uses always #1 for the root hub of the controller. So USB stack's | |
1342 | * port #1, which is wusb virtual-port #0 has address #2. | |
c6515272 SS |
1343 | * |
1344 | * Devices connected under xHCI are not as simple. The host controller | |
1345 | * supports virtualization, so the hardware assigns device addresses and | |
1346 | * the HCD must setup data structures before issuing a set address | |
1347 | * command to the hardware. | |
8af548dc | 1348 | */ |
1da177e4 LT |
1349 | static void choose_address(struct usb_device *udev) |
1350 | { | |
1351 | int devnum; | |
1352 | struct usb_bus *bus = udev->bus; | |
1353 | ||
1354 | /* If khubd ever becomes multithreaded, this will need a lock */ | |
8af548dc IPG |
1355 | if (udev->wusb) { |
1356 | devnum = udev->portnum + 1; | |
1357 | BUG_ON(test_bit(devnum, bus->devmap.devicemap)); | |
1358 | } else { | |
1359 | /* Try to allocate the next devnum beginning at | |
1360 | * bus->devnum_next. */ | |
1361 | devnum = find_next_zero_bit(bus->devmap.devicemap, 128, | |
1362 | bus->devnum_next); | |
1363 | if (devnum >= 128) | |
1364 | devnum = find_next_zero_bit(bus->devmap.devicemap, | |
1365 | 128, 1); | |
1366 | bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); | |
1367 | } | |
1da177e4 LT |
1368 | if (devnum < 128) { |
1369 | set_bit(devnum, bus->devmap.devicemap); | |
1370 | udev->devnum = devnum; | |
1371 | } | |
1372 | } | |
1373 | ||
1374 | static void release_address(struct usb_device *udev) | |
1375 | { | |
1376 | if (udev->devnum > 0) { | |
1377 | clear_bit(udev->devnum, udev->bus->devmap.devicemap); | |
1378 | udev->devnum = -1; | |
1379 | } | |
1380 | } | |
1381 | ||
4953d141 DV |
1382 | static void update_address(struct usb_device *udev, int devnum) |
1383 | { | |
1384 | /* The address for a WUSB device is managed by wusbcore. */ | |
1385 | if (!udev->wusb) | |
1386 | udev->devnum = devnum; | |
1387 | } | |
1388 | ||
d5d4db70 AS |
1389 | #ifdef CONFIG_USB_SUSPEND |
1390 | ||
1391 | static void usb_stop_pm(struct usb_device *udev) | |
1392 | { | |
1393 | /* Synchronize with the ksuspend thread to prevent any more | |
1394 | * autosuspend requests from being submitted, and decrement | |
1395 | * the parent's count of unsuspended children. | |
1396 | */ | |
1397 | usb_pm_lock(udev); | |
1398 | if (udev->parent && !udev->discon_suspended) | |
1399 | usb_autosuspend_device(udev->parent); | |
1400 | usb_pm_unlock(udev); | |
1401 | ||
9ac39f28 AS |
1402 | /* Stop any autosuspend or autoresume requests already submitted */ |
1403 | cancel_delayed_work_sync(&udev->autosuspend); | |
1404 | cancel_work_sync(&udev->autoresume); | |
d5d4db70 AS |
1405 | } |
1406 | ||
1407 | #else | |
1408 | ||
1409 | static inline void usb_stop_pm(struct usb_device *udev) | |
1410 | { } | |
1411 | ||
1412 | #endif | |
1413 | ||
1da177e4 LT |
1414 | /** |
1415 | * usb_disconnect - disconnect a device (usbcore-internal) | |
1416 | * @pdev: pointer to device being disconnected | |
1417 | * Context: !in_interrupt () | |
1418 | * | |
1419 | * Something got disconnected. Get rid of it and all of its children. | |
1420 | * | |
1421 | * If *pdev is a normal device then the parent hub must already be locked. | |
1422 | * If *pdev is a root hub then this routine will acquire the | |
1423 | * usb_bus_list_lock on behalf of the caller. | |
1424 | * | |
1425 | * Only hub drivers (including virtual root hub drivers for host | |
1426 | * controllers) should ever call this. | |
1427 | * | |
1428 | * This call is synchronous, and may not be used in an interrupt context. | |
1429 | */ | |
1430 | void usb_disconnect(struct usb_device **pdev) | |
1431 | { | |
1432 | struct usb_device *udev = *pdev; | |
1433 | int i; | |
1434 | ||
1435 | if (!udev) { | |
441b62c1 | 1436 | pr_debug ("%s nodev\n", __func__); |
1da177e4 LT |
1437 | return; |
1438 | } | |
1439 | ||
1440 | /* mark the device as inactive, so any further urb submissions for | |
1441 | * this device (and any of its children) will fail immediately. | |
1442 | * this quiesces everyting except pending urbs. | |
1443 | */ | |
1444 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
1da177e4 LT |
1445 | dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum); |
1446 | ||
9ad3d6cc AS |
1447 | usb_lock_device(udev); |
1448 | ||
1da177e4 LT |
1449 | /* Free up all the children before we remove this device */ |
1450 | for (i = 0; i < USB_MAXCHILDREN; i++) { | |
1451 | if (udev->children[i]) | |
1452 | usb_disconnect(&udev->children[i]); | |
1453 | } | |
1454 | ||
1455 | /* deallocate hcd/hardware state ... nuking all pending urbs and | |
1456 | * cleaning up all state associated with the current configuration | |
1457 | * so that the hardware is now fully quiesced. | |
1458 | */ | |
782da727 | 1459 | dev_dbg (&udev->dev, "unregistering device\n"); |
1da177e4 | 1460 | usb_disable_device(udev, 0); |
cde217a5 | 1461 | usb_hcd_synchronize_unlinks(udev); |
1da177e4 | 1462 | |
3b23dd6f | 1463 | usb_remove_ep_devs(&udev->ep0); |
782da727 AS |
1464 | usb_unlock_device(udev); |
1465 | ||
1466 | /* Unregister the device. The device driver is responsible | |
3b23dd6f AS |
1467 | * for de-configuring the device and invoking the remove-device |
1468 | * notifier chain (used by usbfs and possibly others). | |
782da727 AS |
1469 | */ |
1470 | device_del(&udev->dev); | |
3099e75a | 1471 | |
782da727 | 1472 | /* Free the device number and delete the parent's children[] |
1da177e4 LT |
1473 | * (or root_hub) pointer. |
1474 | */ | |
1da177e4 | 1475 | release_address(udev); |
1da177e4 LT |
1476 | |
1477 | /* Avoid races with recursively_mark_NOTATTACHED() */ | |
1478 | spin_lock_irq(&device_state_lock); | |
1479 | *pdev = NULL; | |
1480 | spin_unlock_irq(&device_state_lock); | |
1481 | ||
d5d4db70 | 1482 | usb_stop_pm(udev); |
ee49fb5d | 1483 | |
782da727 | 1484 | put_device(&udev->dev); |
1da177e4 LT |
1485 | } |
1486 | ||
f2a383e4 | 1487 | #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
1da177e4 LT |
1488 | static void show_string(struct usb_device *udev, char *id, char *string) |
1489 | { | |
1490 | if (!string) | |
1491 | return; | |
1492 | dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string); | |
1493 | } | |
1494 | ||
f2a383e4 GKH |
1495 | static void announce_device(struct usb_device *udev) |
1496 | { | |
1497 | dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", | |
1498 | le16_to_cpu(udev->descriptor.idVendor), | |
1499 | le16_to_cpu(udev->descriptor.idProduct)); | |
b9cef6c3 WF |
1500 | dev_info(&udev->dev, |
1501 | "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", | |
f2a383e4 GKH |
1502 | udev->descriptor.iManufacturer, |
1503 | udev->descriptor.iProduct, | |
1504 | udev->descriptor.iSerialNumber); | |
1505 | show_string(udev, "Product", udev->product); | |
1506 | show_string(udev, "Manufacturer", udev->manufacturer); | |
1507 | show_string(udev, "SerialNumber", udev->serial); | |
1508 | } | |
1da177e4 | 1509 | #else |
f2a383e4 | 1510 | static inline void announce_device(struct usb_device *udev) { } |
1da177e4 LT |
1511 | #endif |
1512 | ||
1da177e4 LT |
1513 | #ifdef CONFIG_USB_OTG |
1514 | #include "otg_whitelist.h" | |
1515 | #endif | |
1516 | ||
3ede760f | 1517 | /** |
d9d16e8a | 1518 | * usb_configure_device_otg - FIXME (usbcore-internal) |
3ede760f ON |
1519 | * @udev: newly addressed device (in ADDRESS state) |
1520 | * | |
d9d16e8a | 1521 | * Do configuration for On-The-Go devices |
3ede760f | 1522 | */ |
d9d16e8a | 1523 | static int usb_configure_device_otg(struct usb_device *udev) |
1da177e4 | 1524 | { |
d9d16e8a | 1525 | int err = 0; |
1da177e4 LT |
1526 | |
1527 | #ifdef CONFIG_USB_OTG | |
1528 | /* | |
1529 | * OTG-aware devices on OTG-capable root hubs may be able to use SRP, | |
1530 | * to wake us after we've powered off VBUS; and HNP, switching roles | |
1531 | * "host" to "peripheral". The OTG descriptor helps figure this out. | |
1532 | */ | |
1533 | if (!udev->bus->is_b_host | |
1534 | && udev->config | |
1535 | && udev->parent == udev->bus->root_hub) { | |
1536 | struct usb_otg_descriptor *desc = 0; | |
1537 | struct usb_bus *bus = udev->bus; | |
1538 | ||
1539 | /* descriptor may appear anywhere in config */ | |
1540 | if (__usb_get_extra_descriptor (udev->rawdescriptors[0], | |
1541 | le16_to_cpu(udev->config[0].desc.wTotalLength), | |
1542 | USB_DT_OTG, (void **) &desc) == 0) { | |
1543 | if (desc->bmAttributes & USB_OTG_HNP) { | |
12c3da34 | 1544 | unsigned port1 = udev->portnum; |
fc849b85 | 1545 | |
1da177e4 LT |
1546 | dev_info(&udev->dev, |
1547 | "Dual-Role OTG device on %sHNP port\n", | |
1548 | (port1 == bus->otg_port) | |
1549 | ? "" : "non-"); | |
1550 | ||
1551 | /* enable HNP before suspend, it's simpler */ | |
1552 | if (port1 == bus->otg_port) | |
1553 | bus->b_hnp_enable = 1; | |
1554 | err = usb_control_msg(udev, | |
1555 | usb_sndctrlpipe(udev, 0), | |
1556 | USB_REQ_SET_FEATURE, 0, | |
1557 | bus->b_hnp_enable | |
1558 | ? USB_DEVICE_B_HNP_ENABLE | |
1559 | : USB_DEVICE_A_ALT_HNP_SUPPORT, | |
1560 | 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
1561 | if (err < 0) { | |
1562 | /* OTG MESSAGE: report errors here, | |
1563 | * customize to match your product. | |
1564 | */ | |
1565 | dev_info(&udev->dev, | |
b9cef6c3 | 1566 | "can't set HNP mode: %d\n", |
1da177e4 LT |
1567 | err); |
1568 | bus->b_hnp_enable = 0; | |
1569 | } | |
1570 | } | |
1571 | } | |
1572 | } | |
1573 | ||
1574 | if (!is_targeted(udev)) { | |
1575 | ||
1576 | /* Maybe it can talk to us, though we can't talk to it. | |
1577 | * (Includes HNP test device.) | |
1578 | */ | |
1579 | if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { | |
634a84f8 | 1580 | err = usb_port_suspend(udev, PMSG_SUSPEND); |
1da177e4 LT |
1581 | if (err < 0) |
1582 | dev_dbg(&udev->dev, "HNP fail, %d\n", err); | |
1583 | } | |
ffcdc18d | 1584 | err = -ENOTSUPP; |
1da177e4 LT |
1585 | goto fail; |
1586 | } | |
d9d16e8a | 1587 | fail: |
1da177e4 | 1588 | #endif |
d9d16e8a IPG |
1589 | return err; |
1590 | } | |
1591 | ||
1592 | ||
1593 | /** | |
1594 | * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal) | |
1595 | * @udev: newly addressed device (in ADDRESS state) | |
1596 | * | |
1597 | * This is only called by usb_new_device() and usb_authorize_device() | |
1598 | * and FIXME -- all comments that apply to them apply here wrt to | |
1599 | * environment. | |
1600 | * | |
1601 | * If the device is WUSB and not authorized, we don't attempt to read | |
1602 | * the string descriptors, as they will be errored out by the device | |
1603 | * until it has been authorized. | |
1604 | */ | |
1605 | static int usb_configure_device(struct usb_device *udev) | |
1606 | { | |
1607 | int err; | |
1da177e4 | 1608 | |
d9d16e8a IPG |
1609 | if (udev->config == NULL) { |
1610 | err = usb_get_configuration(udev); | |
1611 | if (err < 0) { | |
1612 | dev_err(&udev->dev, "can't read configurations, error %d\n", | |
1613 | err); | |
1614 | goto fail; | |
1615 | } | |
1616 | } | |
1617 | if (udev->wusb == 1 && udev->authorized == 0) { | |
1618 | udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1619 | udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1620 | udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1621 | } | |
1622 | else { | |
1623 | /* read the standard strings and cache them if present */ | |
1624 | udev->product = usb_cache_string(udev, udev->descriptor.iProduct); | |
1625 | udev->manufacturer = usb_cache_string(udev, | |
1626 | udev->descriptor.iManufacturer); | |
1627 | udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); | |
1628 | } | |
1629 | err = usb_configure_device_otg(udev); | |
1630 | fail: | |
1631 | return err; | |
1632 | } | |
1633 | ||
1634 | ||
1635 | /** | |
1636 | * usb_new_device - perform initial device setup (usbcore-internal) | |
1637 | * @udev: newly addressed device (in ADDRESS state) | |
1638 | * | |
1639 | * This is called with devices which have been enumerated, but not yet | |
1640 | * configured. The device descriptor is available, but not descriptors | |
1641 | * for any device configuration. The caller must have locked either | |
1642 | * the parent hub (if udev is a normal device) or else the | |
1643 | * usb_bus_list_lock (if udev is a root hub). The parent's pointer to | |
1644 | * udev has already been installed, but udev is not yet visible through | |
1645 | * sysfs or other filesystem code. | |
1646 | * | |
1647 | * It will return if the device is configured properly or not. Zero if | |
1648 | * the interface was registered with the driver core; else a negative | |
1649 | * errno value. | |
1650 | * | |
1651 | * This call is synchronous, and may not be used in an interrupt context. | |
1652 | * | |
1653 | * Only the hub driver or root-hub registrar should ever call this. | |
1654 | */ | |
1655 | int usb_new_device(struct usb_device *udev) | |
1656 | { | |
1657 | int err; | |
1658 | ||
6cd13201 AS |
1659 | /* Increment the parent's count of unsuspended children */ |
1660 | if (udev->parent) | |
1661 | usb_autoresume_device(udev->parent); | |
1662 | ||
d9d16e8a IPG |
1663 | usb_detect_quirks(udev); /* Determine quirks */ |
1664 | err = usb_configure_device(udev); /* detect & probe dev/intfs */ | |
1665 | if (err < 0) | |
1666 | goto fail; | |
c6515272 SS |
1667 | dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", |
1668 | udev->devnum, udev->bus->busnum, | |
1669 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
9f8b17e6 KS |
1670 | /* export the usbdev device-node for libusb */ |
1671 | udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, | |
1672 | (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); | |
1673 | ||
6cd13201 AS |
1674 | /* Tell the world! */ |
1675 | announce_device(udev); | |
195af2cc | 1676 | |
782da727 | 1677 | /* Register the device. The device driver is responsible |
3b23dd6f AS |
1678 | * for configuring the device and invoking the add-device |
1679 | * notifier chain (used by usbfs and possibly others). | |
782da727 | 1680 | */ |
9f8b17e6 | 1681 | err = device_add(&udev->dev); |
1da177e4 LT |
1682 | if (err) { |
1683 | dev_err(&udev->dev, "can't device_add, error %d\n", err); | |
1684 | goto fail; | |
1685 | } | |
9ad3d6cc | 1686 | |
3b23dd6f | 1687 | (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); |
c066475e | 1688 | return err; |
1da177e4 LT |
1689 | |
1690 | fail: | |
1691 | usb_set_device_state(udev, USB_STATE_NOTATTACHED); | |
6cd13201 | 1692 | usb_stop_pm(udev); |
d9d16e8a | 1693 | return err; |
1da177e4 LT |
1694 | } |
1695 | ||
93993a0a IPG |
1696 | |
1697 | /** | |
fd39c86b RD |
1698 | * usb_deauthorize_device - deauthorize a device (usbcore-internal) |
1699 | * @usb_dev: USB device | |
1700 | * | |
1701 | * Move the USB device to a very basic state where interfaces are disabled | |
1702 | * and the device is in fact unconfigured and unusable. | |
93993a0a IPG |
1703 | * |
1704 | * We share a lock (that we have) with device_del(), so we need to | |
1705 | * defer its call. | |
1706 | */ | |
1707 | int usb_deauthorize_device(struct usb_device *usb_dev) | |
1708 | { | |
1709 | unsigned cnt; | |
1710 | usb_lock_device(usb_dev); | |
1711 | if (usb_dev->authorized == 0) | |
1712 | goto out_unauthorized; | |
1713 | usb_dev->authorized = 0; | |
1714 | usb_set_configuration(usb_dev, -1); | |
1715 | usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1716 | usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1717 | usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL); | |
1718 | kfree(usb_dev->config); | |
1719 | usb_dev->config = NULL; | |
1720 | for (cnt = 0; cnt < usb_dev->descriptor.bNumConfigurations; cnt++) | |
1721 | kfree(usb_dev->rawdescriptors[cnt]); | |
1722 | usb_dev->descriptor.bNumConfigurations = 0; | |
1723 | kfree(usb_dev->rawdescriptors); | |
1724 | out_unauthorized: | |
1725 | usb_unlock_device(usb_dev); | |
1726 | return 0; | |
1727 | } | |
1728 | ||
1729 | ||
1730 | int usb_authorize_device(struct usb_device *usb_dev) | |
1731 | { | |
1732 | int result = 0, c; | |
1733 | usb_lock_device(usb_dev); | |
1734 | if (usb_dev->authorized == 1) | |
1735 | goto out_authorized; | |
1736 | kfree(usb_dev->product); | |
1737 | usb_dev->product = NULL; | |
1738 | kfree(usb_dev->manufacturer); | |
1739 | usb_dev->manufacturer = NULL; | |
1740 | kfree(usb_dev->serial); | |
1741 | usb_dev->serial = NULL; | |
1742 | result = usb_autoresume_device(usb_dev); | |
1743 | if (result < 0) { | |
1744 | dev_err(&usb_dev->dev, | |
1745 | "can't autoresume for authorization: %d\n", result); | |
1746 | goto error_autoresume; | |
1747 | } | |
1748 | result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); | |
1749 | if (result < 0) { | |
1750 | dev_err(&usb_dev->dev, "can't re-read device descriptor for " | |
1751 | "authorization: %d\n", result); | |
1752 | goto error_device_descriptor; | |
1753 | } | |
1754 | usb_dev->authorized = 1; | |
1755 | result = usb_configure_device(usb_dev); | |
1756 | if (result < 0) | |
1757 | goto error_configure; | |
1758 | /* Choose and set the configuration. This registers the interfaces | |
1759 | * with the driver core and lets interface drivers bind to them. | |
1760 | */ | |
b5ea060f | 1761 | c = usb_choose_configuration(usb_dev); |
93993a0a IPG |
1762 | if (c >= 0) { |
1763 | result = usb_set_configuration(usb_dev, c); | |
1764 | if (result) { | |
1765 | dev_err(&usb_dev->dev, | |
1766 | "can't set config #%d, error %d\n", c, result); | |
1767 | /* This need not be fatal. The user can try to | |
1768 | * set other configurations. */ | |
1769 | } | |
1770 | } | |
1771 | dev_info(&usb_dev->dev, "authorized to connect\n"); | |
1772 | error_configure: | |
1773 | error_device_descriptor: | |
1774 | error_autoresume: | |
1775 | out_authorized: | |
1776 | usb_unlock_device(usb_dev); // complements locktree | |
1777 | return result; | |
1778 | } | |
1779 | ||
1780 | ||
0165de09 IPG |
1781 | /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
1782 | static unsigned hub_is_wusb(struct usb_hub *hub) | |
1783 | { | |
1784 | struct usb_hcd *hcd; | |
1785 | if (hub->hdev->parent != NULL) /* not a root hub? */ | |
1786 | return 0; | |
1787 | hcd = container_of(hub->hdev->bus, struct usb_hcd, self); | |
1788 | return hcd->wireless; | |
1789 | } | |
1790 | ||
1791 | ||
1da177e4 LT |
1792 | #define PORT_RESET_TRIES 5 |
1793 | #define SET_ADDRESS_TRIES 2 | |
1794 | #define GET_DESCRIPTOR_TRIES 2 | |
1795 | #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) | |
1796 | #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first) | |
1797 | ||
1798 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ | |
1799 | #define HUB_SHORT_RESET_TIME 10 | |
1800 | #define HUB_LONG_RESET_TIME 200 | |
1801 | #define HUB_RESET_TIMEOUT 500 | |
1802 | ||
1803 | static int hub_port_wait_reset(struct usb_hub *hub, int port1, | |
1804 | struct usb_device *udev, unsigned int delay) | |
1805 | { | |
1806 | int delay_time, ret; | |
1807 | u16 portstatus; | |
1808 | u16 portchange; | |
1809 | ||
1810 | for (delay_time = 0; | |
1811 | delay_time < HUB_RESET_TIMEOUT; | |
1812 | delay_time += delay) { | |
1813 | /* wait to give the device a chance to reset */ | |
1814 | msleep(delay); | |
1815 | ||
1816 | /* read and decode port status */ | |
1817 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
1818 | if (ret < 0) | |
1819 | return ret; | |
1820 | ||
1821 | /* Device went away? */ | |
1822 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) | |
1823 | return -ENOTCONN; | |
1824 | ||
dd4dd19e | 1825 | /* bomb out completely if the connection bounced */ |
1da177e4 | 1826 | if ((portchange & USB_PORT_STAT_C_CONNECTION)) |
dd4dd19e | 1827 | return -ENOTCONN; |
1da177e4 LT |
1828 | |
1829 | /* if we`ve finished resetting, then break out of the loop */ | |
1830 | if (!(portstatus & USB_PORT_STAT_RESET) && | |
1831 | (portstatus & USB_PORT_STAT_ENABLE)) { | |
0165de09 IPG |
1832 | if (hub_is_wusb(hub)) |
1833 | udev->speed = USB_SPEED_VARIABLE; | |
1834 | else if (portstatus & USB_PORT_STAT_HIGH_SPEED) | |
1da177e4 LT |
1835 | udev->speed = USB_SPEED_HIGH; |
1836 | else if (portstatus & USB_PORT_STAT_LOW_SPEED) | |
1837 | udev->speed = USB_SPEED_LOW; | |
1838 | else | |
1839 | udev->speed = USB_SPEED_FULL; | |
1840 | return 0; | |
1841 | } | |
1842 | ||
1843 | /* switch to the long delay after two short delay failures */ | |
1844 | if (delay_time >= 2 * HUB_SHORT_RESET_TIME) | |
1845 | delay = HUB_LONG_RESET_TIME; | |
1846 | ||
1847 | dev_dbg (hub->intfdev, | |
1848 | "port %d not reset yet, waiting %dms\n", | |
1849 | port1, delay); | |
1850 | } | |
1851 | ||
1852 | return -EBUSY; | |
1853 | } | |
1854 | ||
1855 | static int hub_port_reset(struct usb_hub *hub, int port1, | |
1856 | struct usb_device *udev, unsigned int delay) | |
1857 | { | |
1858 | int i, status; | |
1859 | ||
32fe0198 AS |
1860 | /* Block EHCI CF initialization during the port reset. |
1861 | * Some companion controllers don't like it when they mix. | |
1862 | */ | |
1863 | down_read(&ehci_cf_port_reset_rwsem); | |
1864 | ||
1da177e4 LT |
1865 | /* Reset the port */ |
1866 | for (i = 0; i < PORT_RESET_TRIES; i++) { | |
1867 | status = set_port_feature(hub->hdev, | |
1868 | port1, USB_PORT_FEAT_RESET); | |
1869 | if (status) | |
1870 | dev_err(hub->intfdev, | |
1871 | "cannot reset port %d (err = %d)\n", | |
1872 | port1, status); | |
1873 | else { | |
1874 | status = hub_port_wait_reset(hub, port1, udev, delay); | |
dd16525b | 1875 | if (status && status != -ENOTCONN) |
1da177e4 LT |
1876 | dev_dbg(hub->intfdev, |
1877 | "port_wait_reset: err = %d\n", | |
1878 | status); | |
1879 | } | |
1880 | ||
1881 | /* return on disconnect or reset */ | |
1882 | switch (status) { | |
1883 | case 0: | |
b789696a DB |
1884 | /* TRSTRCY = 10 ms; plus some extra */ |
1885 | msleep(10 + 40); | |
4953d141 | 1886 | update_address(udev, 0); |
1da177e4 LT |
1887 | /* FALL THROUGH */ |
1888 | case -ENOTCONN: | |
1889 | case -ENODEV: | |
1890 | clear_port_feature(hub->hdev, | |
1891 | port1, USB_PORT_FEAT_C_RESET); | |
1892 | /* FIXME need disconnect() for NOTATTACHED device */ | |
1893 | usb_set_device_state(udev, status | |
1894 | ? USB_STATE_NOTATTACHED | |
1895 | : USB_STATE_DEFAULT); | |
32fe0198 | 1896 | goto done; |
1da177e4 LT |
1897 | } |
1898 | ||
1899 | dev_dbg (hub->intfdev, | |
1900 | "port %d not enabled, trying reset again...\n", | |
1901 | port1); | |
1902 | delay = HUB_LONG_RESET_TIME; | |
1903 | } | |
1904 | ||
1905 | dev_err (hub->intfdev, | |
1906 | "Cannot enable port %i. Maybe the USB cable is bad?\n", | |
1907 | port1); | |
1908 | ||
32fe0198 AS |
1909 | done: |
1910 | up_read(&ehci_cf_port_reset_rwsem); | |
1da177e4 LT |
1911 | return status; |
1912 | } | |
1913 | ||
d388dab7 | 1914 | #ifdef CONFIG_PM |
1da177e4 | 1915 | |
b01b03f3 AS |
1916 | #define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \ |
1917 | USB_PORT_STAT_SUSPEND) | |
1918 | #define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION) | |
1919 | ||
1920 | /* Determine whether the device on a port is ready for a normal resume, | |
1921 | * is ready for a reset-resume, or should be disconnected. | |
1922 | */ | |
1923 | static int check_port_resume_type(struct usb_device *udev, | |
1924 | struct usb_hub *hub, int port1, | |
1925 | int status, unsigned portchange, unsigned portstatus) | |
1926 | { | |
1927 | /* Is the device still present? */ | |
1928 | if (status || (portstatus & MASK_BITS) != WANT_BITS) { | |
1929 | if (status >= 0) | |
1930 | status = -ENODEV; | |
1931 | } | |
1932 | ||
86c57edf AS |
1933 | /* Can't do a normal resume if the port isn't enabled, |
1934 | * so try a reset-resume instead. | |
1935 | */ | |
1936 | else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { | |
1937 | if (udev->persist_enabled) | |
1938 | udev->reset_resume = 1; | |
1939 | else | |
1940 | status = -ENODEV; | |
1941 | } | |
b01b03f3 AS |
1942 | |
1943 | if (status) { | |
1944 | dev_dbg(hub->intfdev, | |
1945 | "port %d status %04x.%04x after resume, %d\n", | |
1946 | port1, portchange, portstatus, status); | |
1947 | } else if (udev->reset_resume) { | |
1948 | ||
1949 | /* Late port handoff can set status-change bits */ | |
1950 | if (portchange & USB_PORT_STAT_C_CONNECTION) | |
1951 | clear_port_feature(hub->hdev, port1, | |
1952 | USB_PORT_FEAT_C_CONNECTION); | |
1953 | if (portchange & USB_PORT_STAT_C_ENABLE) | |
1954 | clear_port_feature(hub->hdev, port1, | |
1955 | USB_PORT_FEAT_C_ENABLE); | |
1956 | } | |
1957 | ||
1958 | return status; | |
1959 | } | |
1960 | ||
1da177e4 LT |
1961 | #ifdef CONFIG_USB_SUSPEND |
1962 | ||
1963 | /* | |
624d6c07 AS |
1964 | * usb_port_suspend - suspend a usb device's upstream port |
1965 | * @udev: device that's no longer in active use, not a root hub | |
1966 | * Context: must be able to sleep; device not locked; pm locks held | |
1967 | * | |
1968 | * Suspends a USB device that isn't in active use, conserving power. | |
1969 | * Devices may wake out of a suspend, if anything important happens, | |
1970 | * using the remote wakeup mechanism. They may also be taken out of | |
1971 | * suspend by the host, using usb_port_resume(). It's also routine | |
1972 | * to disconnect devices while they are suspended. | |
1973 | * | |
1974 | * This only affects the USB hardware for a device; its interfaces | |
1975 | * (and, for hubs, child devices) must already have been suspended. | |
1976 | * | |
1da177e4 LT |
1977 | * Selective port suspend reduces power; most suspended devices draw |
1978 | * less than 500 uA. It's also used in OTG, along with remote wakeup. | |
1979 | * All devices below the suspended port are also suspended. | |
1980 | * | |
1981 | * Devices leave suspend state when the host wakes them up. Some devices | |
1982 | * also support "remote wakeup", where the device can activate the USB | |
1983 | * tree above them to deliver data, such as a keypress or packet. In | |
1984 | * some cases, this wakes the USB host. | |
624d6c07 AS |
1985 | * |
1986 | * Suspending OTG devices may trigger HNP, if that's been enabled | |
1987 | * between a pair of dual-role devices. That will change roles, such | |
1988 | * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. | |
1989 | * | |
1990 | * Devices on USB hub ports have only one "suspend" state, corresponding | |
1991 | * to ACPI D2, "may cause the device to lose some context". | |
1992 | * State transitions include: | |
1993 | * | |
1994 | * - suspend, resume ... when the VBUS power link stays live | |
1995 | * - suspend, disconnect ... VBUS lost | |
1996 | * | |
1997 | * Once VBUS drop breaks the circuit, the port it's using has to go through | |
1998 | * normal re-enumeration procedures, starting with enabling VBUS power. | |
1999 | * Other than re-initializing the hub (plug/unplug, except for root hubs), | |
2000 | * Linux (2.6) currently has NO mechanisms to initiate that: no khubd | |
2001 | * timer, no SRP, no requests through sysfs. | |
2002 | * | |
2003 | * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when | |
2004 | * the root hub for their bus goes into global suspend ... so we don't | |
2005 | * (falsely) update the device power state to say it suspended. | |
2006 | * | |
2007 | * Returns 0 on success, else negative errno. | |
1da177e4 | 2008 | */ |
65bfd296 | 2009 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 2010 | { |
624d6c07 AS |
2011 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
2012 | int port1 = udev->portnum; | |
2013 | int status; | |
1da177e4 LT |
2014 | |
2015 | // dev_dbg(hub->intfdev, "suspend port %d\n", port1); | |
2016 | ||
2017 | /* enable remote wakeup when appropriate; this lets the device | |
2018 | * wake up the upstream hub (including maybe the root hub). | |
2019 | * | |
2020 | * NOTE: OTG devices may issue remote wakeup (or SRP) even when | |
2021 | * we don't explicitly enable it here. | |
2022 | */ | |
645daaab | 2023 | if (udev->do_remote_wakeup) { |
1da177e4 LT |
2024 | status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
2025 | USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, | |
2026 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2027 | NULL, 0, | |
2028 | USB_CTRL_SET_TIMEOUT); | |
2029 | if (status) | |
624d6c07 AS |
2030 | dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
2031 | status); | |
1da177e4 LT |
2032 | } |
2033 | ||
2034 | /* see 7.1.7.6 */ | |
2035 | status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); | |
2036 | if (status) { | |
624d6c07 AS |
2037 | dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", |
2038 | port1, status); | |
1da177e4 LT |
2039 | /* paranoia: "should not happen" */ |
2040 | (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
2041 | USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, | |
2042 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2043 | NULL, 0, | |
2044 | USB_CTRL_SET_TIMEOUT); | |
2045 | } else { | |
2046 | /* device has up to 10 msec to fully suspend */ | |
645daaab | 2047 | dev_dbg(&udev->dev, "usb %ssuspend\n", |
65bfd296 | 2048 | (msg.event & PM_EVENT_AUTO ? "auto-" : "")); |
1da177e4 LT |
2049 | usb_set_device_state(udev, USB_STATE_SUSPENDED); |
2050 | msleep(10); | |
2051 | } | |
2052 | return status; | |
2053 | } | |
2054 | ||
1da177e4 | 2055 | /* |
390a8c34 DB |
2056 | * If the USB "suspend" state is in use (rather than "global suspend"), |
2057 | * many devices will be individually taken out of suspend state using | |
54515fe5 | 2058 | * special "resume" signaling. This routine kicks in shortly after |
1da177e4 LT |
2059 | * hardware resume signaling is finished, either because of selective |
2060 | * resume (by host) or remote wakeup (by device) ... now see what changed | |
2061 | * in the tree that's rooted at this device. | |
54515fe5 AS |
2062 | * |
2063 | * If @udev->reset_resume is set then the device is reset before the | |
2064 | * status check is done. | |
1da177e4 | 2065 | */ |
140d8f68 | 2066 | static int finish_port_resume(struct usb_device *udev) |
1da177e4 | 2067 | { |
54515fe5 | 2068 | int status = 0; |
1da177e4 LT |
2069 | u16 devstatus; |
2070 | ||
2071 | /* caller owns the udev device lock */ | |
b9cef6c3 WF |
2072 | dev_dbg(&udev->dev, "%s\n", |
2073 | udev->reset_resume ? "finish reset-resume" : "finish resume"); | |
1da177e4 LT |
2074 | |
2075 | /* usb ch9 identifies four variants of SUSPENDED, based on what | |
2076 | * state the device resumes to. Linux currently won't see the | |
2077 | * first two on the host side; they'd be inside hub_port_init() | |
2078 | * during many timeouts, but khubd can't suspend until later. | |
2079 | */ | |
2080 | usb_set_device_state(udev, udev->actconfig | |
2081 | ? USB_STATE_CONFIGURED | |
2082 | : USB_STATE_ADDRESS); | |
1da177e4 | 2083 | |
54515fe5 AS |
2084 | /* 10.5.4.5 says not to reset a suspended port if the attached |
2085 | * device is enabled for remote wakeup. Hence the reset | |
2086 | * operation is carried out here, after the port has been | |
2087 | * resumed. | |
2088 | */ | |
2089 | if (udev->reset_resume) | |
86c57edf | 2090 | retry_reset_resume: |
742120c6 | 2091 | status = usb_reset_and_verify_device(udev); |
54515fe5 | 2092 | |
1da177e4 LT |
2093 | /* 10.5.4.5 says be sure devices in the tree are still there. |
2094 | * For now let's assume the device didn't go crazy on resume, | |
2095 | * and device drivers will know about any resume quirks. | |
2096 | */ | |
54515fe5 | 2097 | if (status == 0) { |
46dede46 | 2098 | devstatus = 0; |
54515fe5 AS |
2099 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
2100 | if (status >= 0) | |
46dede46 | 2101 | status = (status > 0 ? 0 : -ENODEV); |
86c57edf AS |
2102 | |
2103 | /* If a normal resume failed, try doing a reset-resume */ | |
2104 | if (status && !udev->reset_resume && udev->persist_enabled) { | |
2105 | dev_dbg(&udev->dev, "retry with reset-resume\n"); | |
2106 | udev->reset_resume = 1; | |
2107 | goto retry_reset_resume; | |
2108 | } | |
54515fe5 | 2109 | } |
b40b7a90 | 2110 | |
624d6c07 AS |
2111 | if (status) { |
2112 | dev_dbg(&udev->dev, "gone after usb resume? status %d\n", | |
2113 | status); | |
2114 | } else if (udev->actconfig) { | |
1da177e4 | 2115 | le16_to_cpus(&devstatus); |
686314cf | 2116 | if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { |
1da177e4 LT |
2117 | status = usb_control_msg(udev, |
2118 | usb_sndctrlpipe(udev, 0), | |
2119 | USB_REQ_CLEAR_FEATURE, | |
2120 | USB_RECIP_DEVICE, | |
2121 | USB_DEVICE_REMOTE_WAKEUP, 0, | |
2122 | NULL, 0, | |
2123 | USB_CTRL_SET_TIMEOUT); | |
a8e7c565 | 2124 | if (status) |
b9cef6c3 WF |
2125 | dev_dbg(&udev->dev, |
2126 | "disable remote wakeup, status %d\n", | |
2127 | status); | |
4bf0ba86 | 2128 | } |
1da177e4 | 2129 | status = 0; |
1da177e4 LT |
2130 | } |
2131 | return status; | |
2132 | } | |
2133 | ||
624d6c07 AS |
2134 | /* |
2135 | * usb_port_resume - re-activate a suspended usb device's upstream port | |
2136 | * @udev: device to re-activate, not a root hub | |
2137 | * Context: must be able to sleep; device not locked; pm locks held | |
2138 | * | |
2139 | * This will re-activate the suspended device, increasing power usage | |
2140 | * while letting drivers communicate again with its endpoints. | |
2141 | * USB resume explicitly guarantees that the power session between | |
2142 | * the host and the device is the same as it was when the device | |
2143 | * suspended. | |
2144 | * | |
feccc30d AS |
2145 | * If @udev->reset_resume is set then this routine won't check that the |
2146 | * port is still enabled. Furthermore, finish_port_resume() above will | |
54515fe5 AS |
2147 | * reset @udev. The end result is that a broken power session can be |
2148 | * recovered and @udev will appear to persist across a loss of VBUS power. | |
2149 | * | |
2150 | * For example, if a host controller doesn't maintain VBUS suspend current | |
2151 | * during a system sleep or is reset when the system wakes up, all the USB | |
2152 | * power sessions below it will be broken. This is especially troublesome | |
2153 | * for mass-storage devices containing mounted filesystems, since the | |
2154 | * device will appear to have disconnected and all the memory mappings | |
2155 | * to it will be lost. Using the USB_PERSIST facility, the device can be | |
2156 | * made to appear as if it had not disconnected. | |
2157 | * | |
742120c6 | 2158 | * This facility can be dangerous. Although usb_reset_and_verify_device() makes |
feccc30d | 2159 | * every effort to insure that the same device is present after the |
54515fe5 AS |
2160 | * reset as before, it cannot provide a 100% guarantee. Furthermore it's |
2161 | * quite possible for a device to remain unaltered but its media to be | |
2162 | * changed. If the user replaces a flash memory card while the system is | |
2163 | * asleep, he will have only himself to blame when the filesystem on the | |
2164 | * new card is corrupted and the system crashes. | |
2165 | * | |
624d6c07 AS |
2166 | * Returns 0 on success, else negative errno. |
2167 | */ | |
65bfd296 | 2168 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
1da177e4 | 2169 | { |
624d6c07 AS |
2170 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
2171 | int port1 = udev->portnum; | |
2172 | int status; | |
2173 | u16 portchange, portstatus; | |
d25450c6 AS |
2174 | |
2175 | /* Skip the initial Clear-Suspend step for a remote wakeup */ | |
2176 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
2177 | if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND)) | |
2178 | goto SuspendCleared; | |
1da177e4 LT |
2179 | |
2180 | // dev_dbg(hub->intfdev, "resume port %d\n", port1); | |
2181 | ||
d5cbad4b AS |
2182 | set_bit(port1, hub->busy_bits); |
2183 | ||
1da177e4 LT |
2184 | /* see 7.1.7.7; affects power usage, but not budgeting */ |
2185 | status = clear_port_feature(hub->hdev, | |
2186 | port1, USB_PORT_FEAT_SUSPEND); | |
2187 | if (status) { | |
624d6c07 AS |
2188 | dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", |
2189 | port1, status); | |
1da177e4 | 2190 | } else { |
1da177e4 | 2191 | /* drive resume for at least 20 msec */ |
686314cf | 2192 | dev_dbg(&udev->dev, "usb %sresume\n", |
65bfd296 | 2193 | (msg.event & PM_EVENT_AUTO ? "auto-" : "")); |
1da177e4 LT |
2194 | msleep(25); |
2195 | ||
1da177e4 LT |
2196 | /* Virtual root hubs can trigger on GET_PORT_STATUS to |
2197 | * stop resume signaling. Then finish the resume | |
2198 | * sequence. | |
2199 | */ | |
d25450c6 | 2200 | status = hub_port_status(hub, port1, &portstatus, &portchange); |
54515fe5 | 2201 | |
b01b03f3 AS |
2202 | /* TRSMRCY = 10 msec */ |
2203 | msleep(10); | |
2204 | } | |
2205 | ||
54515fe5 | 2206 | SuspendCleared: |
b01b03f3 AS |
2207 | if (status == 0) { |
2208 | if (portchange & USB_PORT_STAT_C_SUSPEND) | |
2209 | clear_port_feature(hub->hdev, port1, | |
2210 | USB_PORT_FEAT_C_SUSPEND); | |
1da177e4 | 2211 | } |
1da177e4 | 2212 | |
d5cbad4b | 2213 | clear_bit(port1, hub->busy_bits); |
d5cbad4b | 2214 | |
b01b03f3 AS |
2215 | status = check_port_resume_type(udev, |
2216 | hub, port1, status, portchange, portstatus); | |
54515fe5 AS |
2217 | if (status == 0) |
2218 | status = finish_port_resume(udev); | |
2219 | if (status < 0) { | |
2220 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
2221 | hub_port_logical_disconnect(hub, port1); | |
2222 | } | |
1da177e4 LT |
2223 | return status; |
2224 | } | |
2225 | ||
8808f00c | 2226 | /* caller has locked udev */ |
1da177e4 LT |
2227 | static int remote_wakeup(struct usb_device *udev) |
2228 | { | |
2229 | int status = 0; | |
2230 | ||
1da177e4 | 2231 | if (udev->state == USB_STATE_SUSPENDED) { |
645daaab | 2232 | dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
1941044a | 2233 | usb_mark_last_busy(udev); |
65bfd296 | 2234 | status = usb_external_resume_device(udev, PMSG_REMOTE_RESUME); |
1da177e4 | 2235 | } |
1da177e4 LT |
2236 | return status; |
2237 | } | |
2238 | ||
d388dab7 AS |
2239 | #else /* CONFIG_USB_SUSPEND */ |
2240 | ||
2241 | /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */ | |
2242 | ||
65bfd296 | 2243 | int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
d388dab7 AS |
2244 | { |
2245 | return 0; | |
2246 | } | |
2247 | ||
b01b03f3 AS |
2248 | /* However we may need to do a reset-resume */ |
2249 | ||
65bfd296 | 2250 | int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
d388dab7 | 2251 | { |
b01b03f3 AS |
2252 | struct usb_hub *hub = hdev_to_hub(udev->parent); |
2253 | int port1 = udev->portnum; | |
2254 | int status; | |
2255 | u16 portchange, portstatus; | |
2256 | ||
2257 | status = hub_port_status(hub, port1, &portstatus, &portchange); | |
2258 | status = check_port_resume_type(udev, | |
2259 | hub, port1, status, portchange, portstatus); | |
54515fe5 | 2260 | |
b01b03f3 AS |
2261 | if (status) { |
2262 | dev_dbg(&udev->dev, "can't resume, status %d\n", status); | |
2263 | hub_port_logical_disconnect(hub, port1); | |
2264 | } else if (udev->reset_resume) { | |
54515fe5 | 2265 | dev_dbg(&udev->dev, "reset-resume\n"); |
742120c6 | 2266 | status = usb_reset_and_verify_device(udev); |
54515fe5 AS |
2267 | } |
2268 | return status; | |
d388dab7 AS |
2269 | } |
2270 | ||
2271 | static inline int remote_wakeup(struct usb_device *udev) | |
2272 | { | |
2273 | return 0; | |
2274 | } | |
2275 | ||
2276 | #endif | |
2277 | ||
db690874 | 2278 | static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
1da177e4 LT |
2279 | { |
2280 | struct usb_hub *hub = usb_get_intfdata (intf); | |
2281 | struct usb_device *hdev = hub->hdev; | |
2282 | unsigned port1; | |
1da177e4 | 2283 | |
c9f89fa4 | 2284 | /* fail if children aren't already suspended */ |
1da177e4 LT |
2285 | for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
2286 | struct usb_device *udev; | |
2287 | ||
2288 | udev = hdev->children [port1-1]; | |
6840d255 | 2289 | if (udev && udev->can_submit) { |
65bfd296 | 2290 | if (!(msg.event & PM_EVENT_AUTO)) |
645daaab AS |
2291 | dev_dbg(&intf->dev, "port %d nyet suspended\n", |
2292 | port1); | |
c9f89fa4 DB |
2293 | return -EBUSY; |
2294 | } | |
1da177e4 LT |
2295 | } |
2296 | ||
441b62c1 | 2297 | dev_dbg(&intf->dev, "%s\n", __func__); |
40f122f3 | 2298 | |
12f1ff83 | 2299 | /* stop khubd and related activity */ |
4330354f | 2300 | hub_quiesce(hub, HUB_SUSPEND); |
b6f6436d | 2301 | return 0; |
1da177e4 LT |
2302 | } |
2303 | ||
2304 | static int hub_resume(struct usb_interface *intf) | |
2305 | { | |
5e6effae | 2306 | struct usb_hub *hub = usb_get_intfdata(intf); |
40f122f3 | 2307 | |
5e6effae | 2308 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 2309 | hub_activate(hub, HUB_RESUME); |
1da177e4 LT |
2310 | return 0; |
2311 | } | |
2312 | ||
b41a60ec | 2313 | static int hub_reset_resume(struct usb_interface *intf) |
f07600cf | 2314 | { |
b41a60ec | 2315 | struct usb_hub *hub = usb_get_intfdata(intf); |
f07600cf | 2316 | |
5e6effae | 2317 | dev_dbg(&intf->dev, "%s\n", __func__); |
f2835219 | 2318 | hub_activate(hub, HUB_RESET_RESUME); |
f07600cf AS |
2319 | return 0; |
2320 | } | |
2321 | ||
54515fe5 AS |
2322 | /** |
2323 | * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power | |
2324 | * @rhdev: struct usb_device for the root hub | |
2325 | * | |
2326 | * The USB host controller driver calls this function when its root hub | |
2327 | * is resumed and Vbus power has been interrupted or the controller | |
feccc30d AS |
2328 | * has been reset. The routine marks @rhdev as having lost power. |
2329 | * When the hub driver is resumed it will take notice and carry out | |
2330 | * power-session recovery for all the "USB-PERSIST"-enabled child devices; | |
2331 | * the others will be disconnected. | |
54515fe5 AS |
2332 | */ |
2333 | void usb_root_hub_lost_power(struct usb_device *rhdev) | |
2334 | { | |
2335 | dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); | |
2336 | rhdev->reset_resume = 1; | |
2337 | } | |
2338 | EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); | |
2339 | ||
d388dab7 AS |
2340 | #else /* CONFIG_PM */ |
2341 | ||
2342 | static inline int remote_wakeup(struct usb_device *udev) | |
2343 | { | |
2344 | return 0; | |
2345 | } | |
2346 | ||
f07600cf AS |
2347 | #define hub_suspend NULL |
2348 | #define hub_resume NULL | |
2349 | #define hub_reset_resume NULL | |
d388dab7 AS |
2350 | #endif |
2351 | ||
1da177e4 LT |
2352 | |
2353 | /* USB 2.0 spec, 7.1.7.3 / fig 7-29: | |
2354 | * | |
2355 | * Between connect detection and reset signaling there must be a delay | |
2356 | * of 100ms at least for debounce and power-settling. The corresponding | |
2357 | * timer shall restart whenever the downstream port detects a disconnect. | |
2358 | * | |
2359 | * Apparently there are some bluetooth and irda-dongles and a number of | |
2360 | * low-speed devices for which this debounce period may last over a second. | |
2361 | * Not covered by the spec - but easy to deal with. | |
2362 | * | |
2363 | * This implementation uses a 1500ms total debounce timeout; if the | |
2364 | * connection isn't stable by then it returns -ETIMEDOUT. It checks | |
2365 | * every 25ms for transient disconnects. When the port status has been | |
2366 | * unchanged for 100ms it returns the port status. | |
2367 | */ | |
1da177e4 LT |
2368 | static int hub_port_debounce(struct usb_hub *hub, int port1) |
2369 | { | |
2370 | int ret; | |
2371 | int total_time, stable_time = 0; | |
2372 | u16 portchange, portstatus; | |
2373 | unsigned connection = 0xffff; | |
2374 | ||
2375 | for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { | |
2376 | ret = hub_port_status(hub, port1, &portstatus, &portchange); | |
2377 | if (ret < 0) | |
2378 | return ret; | |
2379 | ||
2380 | if (!(portchange & USB_PORT_STAT_C_CONNECTION) && | |
2381 | (portstatus & USB_PORT_STAT_CONNECTION) == connection) { | |
2382 | stable_time += HUB_DEBOUNCE_STEP; | |
2383 | if (stable_time >= HUB_DEBOUNCE_STABLE) | |
2384 | break; | |
2385 | } else { | |
2386 | stable_time = 0; | |
2387 | connection = portstatus & USB_PORT_STAT_CONNECTION; | |
2388 | } | |
2389 | ||
2390 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
2391 | clear_port_feature(hub->hdev, port1, | |
2392 | USB_PORT_FEAT_C_CONNECTION); | |
2393 | } | |
2394 | ||
2395 | if (total_time >= HUB_DEBOUNCE_TIMEOUT) | |
2396 | break; | |
2397 | msleep(HUB_DEBOUNCE_STEP); | |
2398 | } | |
2399 | ||
2400 | dev_dbg (hub->intfdev, | |
2401 | "debounce: port %d: total %dms stable %dms status 0x%x\n", | |
2402 | port1, total_time, stable_time, portstatus); | |
2403 | ||
2404 | if (stable_time < HUB_DEBOUNCE_STABLE) | |
2405 | return -ETIMEDOUT; | |
2406 | return portstatus; | |
2407 | } | |
2408 | ||
fc721f51 | 2409 | void usb_ep0_reinit(struct usb_device *udev) |
1da177e4 | 2410 | { |
ddeac4e7 AS |
2411 | usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); |
2412 | usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); | |
2caf7fcd | 2413 | usb_enable_endpoint(udev, &udev->ep0, true); |
1da177e4 | 2414 | } |
fc721f51 | 2415 | EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
1da177e4 LT |
2416 | |
2417 | #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) | |
2418 | #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) | |
2419 | ||
4326ed0b | 2420 | static int hub_set_address(struct usb_device *udev, int devnum) |
1da177e4 LT |
2421 | { |
2422 | int retval; | |
c6515272 | 2423 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
1da177e4 | 2424 | |
c6515272 SS |
2425 | /* |
2426 | * The host controller will choose the device address, | |
2427 | * instead of the core having chosen it earlier | |
2428 | */ | |
2429 | if (!hcd->driver->address_device && devnum <= 1) | |
1da177e4 LT |
2430 | return -EINVAL; |
2431 | if (udev->state == USB_STATE_ADDRESS) | |
2432 | return 0; | |
2433 | if (udev->state != USB_STATE_DEFAULT) | |
2434 | return -EINVAL; | |
c6515272 SS |
2435 | if (hcd->driver->address_device) { |
2436 | retval = hcd->driver->address_device(hcd, udev); | |
2437 | } else { | |
2438 | retval = usb_control_msg(udev, usb_sndaddr0pipe(), | |
2439 | USB_REQ_SET_ADDRESS, 0, devnum, 0, | |
2440 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
2441 | if (retval == 0) | |
2442 | update_address(udev, devnum); | |
2443 | } | |
1da177e4 | 2444 | if (retval == 0) { |
4953d141 | 2445 | /* Device now using proper address. */ |
1da177e4 | 2446 | usb_set_device_state(udev, USB_STATE_ADDRESS); |
fc721f51 | 2447 | usb_ep0_reinit(udev); |
1da177e4 LT |
2448 | } |
2449 | return retval; | |
2450 | } | |
2451 | ||
2452 | /* Reset device, (re)assign address, get device descriptor. | |
2453 | * Device connection must be stable, no more debouncing needed. | |
2454 | * Returns device in USB_STATE_ADDRESS, except on error. | |
2455 | * | |
2456 | * If this is called for an already-existing device (as part of | |
742120c6 | 2457 | * usb_reset_and_verify_device), the caller must own the device lock. For a |
1da177e4 LT |
2458 | * newly detected device that is not accessible through any global |
2459 | * pointers, it's not necessary to lock the device. | |
2460 | */ | |
2461 | static int | |
2462 | hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, | |
2463 | int retry_counter) | |
2464 | { | |
4186ecf8 | 2465 | static DEFINE_MUTEX(usb_address0_mutex); |
1da177e4 LT |
2466 | |
2467 | struct usb_device *hdev = hub->hdev; | |
e7b77172 | 2468 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
1da177e4 LT |
2469 | int i, j, retval; |
2470 | unsigned delay = HUB_SHORT_RESET_TIME; | |
2471 | enum usb_device_speed oldspeed = udev->speed; | |
83a07196 | 2472 | char *speed, *type; |
4326ed0b | 2473 | int devnum = udev->devnum; |
1da177e4 LT |
2474 | |
2475 | /* root hub ports have a slightly longer reset period | |
2476 | * (from USB 2.0 spec, section 7.1.7.5) | |
2477 | */ | |
2478 | if (!hdev->parent) { | |
2479 | delay = HUB_ROOT_RESET_TIME; | |
2480 | if (port1 == hdev->bus->otg_port) | |
2481 | hdev->bus->b_hnp_enable = 0; | |
2482 | } | |
2483 | ||
2484 | /* Some low speed devices have problems with the quick delay, so */ | |
2485 | /* be a bit pessimistic with those devices. RHbug #23670 */ | |
2486 | if (oldspeed == USB_SPEED_LOW) | |
2487 | delay = HUB_LONG_RESET_TIME; | |
2488 | ||
4186ecf8 | 2489 | mutex_lock(&usb_address0_mutex); |
1da177e4 | 2490 | |
e7b77172 SS |
2491 | if ((hcd->driver->flags & HCD_USB3) && udev->config) { |
2492 | /* FIXME this will need special handling by the xHCI driver. */ | |
2493 | dev_dbg(&udev->dev, | |
2494 | "xHCI reset of configured device " | |
2495 | "not supported yet.\n"); | |
2496 | retval = -EINVAL; | |
1da177e4 | 2497 | goto fail; |
e7b77172 SS |
2498 | } else if (!udev->config && oldspeed == USB_SPEED_SUPER) { |
2499 | /* Don't reset USB 3.0 devices during an initial setup */ | |
2500 | usb_set_device_state(udev, USB_STATE_DEFAULT); | |
2501 | } else { | |
2502 | /* Reset the device; full speed may morph to high speed */ | |
2503 | /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ | |
2504 | retval = hub_port_reset(hub, port1, udev, delay); | |
2505 | if (retval < 0) /* error or disconnect */ | |
2506 | goto fail; | |
2507 | /* success, speed is known */ | |
2508 | } | |
1da177e4 LT |
2509 | retval = -ENODEV; |
2510 | ||
2511 | if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { | |
2512 | dev_dbg(&udev->dev, "device reset changed speed!\n"); | |
2513 | goto fail; | |
2514 | } | |
2515 | oldspeed = udev->speed; | |
4326ed0b | 2516 | |
1da177e4 LT |
2517 | /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
2518 | * it's fixed size except for full speed devices. | |
5bb6e0ae IPG |
2519 | * For Wireless USB devices, ep0 max packet is always 512 (tho |
2520 | * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. | |
1da177e4 LT |
2521 | */ |
2522 | switch (udev->speed) { | |
6b403b02 | 2523 | case USB_SPEED_SUPER: |
5bb6e0ae | 2524 | case USB_SPEED_VARIABLE: /* fixed at 512 */ |
551509d2 | 2525 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); |
5bb6e0ae | 2526 | break; |
1da177e4 | 2527 | case USB_SPEED_HIGH: /* fixed at 64 */ |
551509d2 | 2528 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
2529 | break; |
2530 | case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ | |
2531 | /* to determine the ep0 maxpacket size, try to read | |
2532 | * the device descriptor to get bMaxPacketSize0 and | |
2533 | * then correct our initial guess. | |
2534 | */ | |
551509d2 | 2535 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
1da177e4 LT |
2536 | break; |
2537 | case USB_SPEED_LOW: /* fixed at 8 */ | |
551509d2 | 2538 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); |
1da177e4 LT |
2539 | break; |
2540 | default: | |
2541 | goto fail; | |
2542 | } | |
2543 | ||
83a07196 IPG |
2544 | type = ""; |
2545 | switch (udev->speed) { | |
2546 | case USB_SPEED_LOW: speed = "low"; break; | |
2547 | case USB_SPEED_FULL: speed = "full"; break; | |
2548 | case USB_SPEED_HIGH: speed = "high"; break; | |
6b403b02 SS |
2549 | case USB_SPEED_SUPER: |
2550 | speed = "super"; | |
2551 | break; | |
83a07196 IPG |
2552 | case USB_SPEED_VARIABLE: |
2553 | speed = "variable"; | |
2554 | type = "Wireless "; | |
2555 | break; | |
2556 | default: speed = "?"; break; | |
2557 | } | |
c6515272 SS |
2558 | if (udev->speed != USB_SPEED_SUPER) |
2559 | dev_info(&udev->dev, | |
2560 | "%s %s speed %sUSB device using %s and address %d\n", | |
2561 | (udev->config) ? "reset" : "new", speed, type, | |
2562 | udev->bus->controller->driver->name, devnum); | |
1da177e4 LT |
2563 | |
2564 | /* Set up TT records, if needed */ | |
2565 | if (hdev->tt) { | |
2566 | udev->tt = hdev->tt; | |
2567 | udev->ttport = hdev->ttport; | |
2568 | } else if (udev->speed != USB_SPEED_HIGH | |
2569 | && hdev->speed == USB_SPEED_HIGH) { | |
2570 | udev->tt = &hub->tt; | |
2571 | udev->ttport = port1; | |
2572 | } | |
2573 | ||
2574 | /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? | |
2575 | * Because device hardware and firmware is sometimes buggy in | |
2576 | * this area, and this is how Linux has done it for ages. | |
2577 | * Change it cautiously. | |
2578 | * | |
2579 | * NOTE: If USE_NEW_SCHEME() is true we will start by issuing | |
2580 | * a 64-byte GET_DESCRIPTOR request. This is what Windows does, | |
2581 | * so it may help with some non-standards-compliant devices. | |
2582 | * Otherwise we start with SET_ADDRESS and then try to read the | |
2583 | * first 8 bytes of the device descriptor to get the ep0 maxpacket | |
2584 | * value. | |
2585 | */ | |
2586 | for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { | |
c6515272 SS |
2587 | /* |
2588 | * An xHCI controller cannot send any packets to a device until | |
2589 | * a set address command successfully completes. | |
2590 | */ | |
2591 | if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) { | |
1da177e4 LT |
2592 | struct usb_device_descriptor *buf; |
2593 | int r = 0; | |
2594 | ||
2595 | #define GET_DESCRIPTOR_BUFSIZE 64 | |
2596 | buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); | |
2597 | if (!buf) { | |
2598 | retval = -ENOMEM; | |
2599 | continue; | |
2600 | } | |
2601 | ||
b89ee19a AS |
2602 | /* Retry on all errors; some devices are flakey. |
2603 | * 255 is for WUSB devices, we actually need to use | |
2604 | * 512 (WUSB1.0[4.8.1]). | |
1da177e4 LT |
2605 | */ |
2606 | for (j = 0; j < 3; ++j) { | |
2607 | buf->bMaxPacketSize0 = 0; | |
2608 | r = usb_control_msg(udev, usb_rcvaddr0pipe(), | |
2609 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, | |
2610 | USB_DT_DEVICE << 8, 0, | |
2611 | buf, GET_DESCRIPTOR_BUFSIZE, | |
fd7c519d | 2612 | initial_descriptor_timeout); |
1da177e4 | 2613 | switch (buf->bMaxPacketSize0) { |
5bb6e0ae | 2614 | case 8: case 16: case 32: case 64: case 255: |
1da177e4 LT |
2615 | if (buf->bDescriptorType == |
2616 | USB_DT_DEVICE) { | |
2617 | r = 0; | |
2618 | break; | |
2619 | } | |
2620 | /* FALL THROUGH */ | |
2621 | default: | |
2622 | if (r == 0) | |
2623 | r = -EPROTO; | |
2624 | break; | |
2625 | } | |
2626 | if (r == 0) | |
2627 | break; | |
2628 | } | |
2629 | udev->descriptor.bMaxPacketSize0 = | |
2630 | buf->bMaxPacketSize0; | |
2631 | kfree(buf); | |
2632 | ||
2633 | retval = hub_port_reset(hub, port1, udev, delay); | |
2634 | if (retval < 0) /* error or disconnect */ | |
2635 | goto fail; | |
2636 | if (oldspeed != udev->speed) { | |
2637 | dev_dbg(&udev->dev, | |
2638 | "device reset changed speed!\n"); | |
2639 | retval = -ENODEV; | |
2640 | goto fail; | |
2641 | } | |
2642 | if (r) { | |
b9cef6c3 WF |
2643 | dev_err(&udev->dev, |
2644 | "device descriptor read/64, error %d\n", | |
2645 | r); | |
1da177e4 LT |
2646 | retval = -EMSGSIZE; |
2647 | continue; | |
2648 | } | |
2649 | #undef GET_DESCRIPTOR_BUFSIZE | |
2650 | } | |
2651 | ||
6c529cdc IPG |
2652 | /* |
2653 | * If device is WUSB, we already assigned an | |
2654 | * unauthorized address in the Connect Ack sequence; | |
2655 | * authorization will assign the final address. | |
2656 | */ | |
c6515272 | 2657 | if (udev->wusb == 0) { |
6c529cdc IPG |
2658 | for (j = 0; j < SET_ADDRESS_TRIES; ++j) { |
2659 | retval = hub_set_address(udev, devnum); | |
2660 | if (retval >= 0) | |
2661 | break; | |
2662 | msleep(200); | |
2663 | } | |
2664 | if (retval < 0) { | |
2665 | dev_err(&udev->dev, | |
2666 | "device not accepting address %d, error %d\n", | |
2667 | devnum, retval); | |
2668 | goto fail; | |
2669 | } | |
c6515272 SS |
2670 | if (udev->speed == USB_SPEED_SUPER) { |
2671 | devnum = udev->devnum; | |
2672 | dev_info(&udev->dev, | |
2673 | "%s SuperSpeed USB device using %s and address %d\n", | |
2674 | (udev->config) ? "reset" : "new", | |
2675 | udev->bus->controller->driver->name, devnum); | |
2676 | } | |
6c529cdc IPG |
2677 | |
2678 | /* cope with hardware quirkiness: | |
2679 | * - let SET_ADDRESS settle, some device hardware wants it | |
2680 | * - read ep0 maxpacket even for high and low speed, | |
2681 | */ | |
2682 | msleep(10); | |
c6515272 | 2683 | if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) |
1da177e4 | 2684 | break; |
6c529cdc | 2685 | } |
1da177e4 LT |
2686 | |
2687 | retval = usb_get_device_descriptor(udev, 8); | |
2688 | if (retval < 8) { | |
b9cef6c3 WF |
2689 | dev_err(&udev->dev, |
2690 | "device descriptor read/8, error %d\n", | |
2691 | retval); | |
1da177e4 LT |
2692 | if (retval >= 0) |
2693 | retval = -EMSGSIZE; | |
2694 | } else { | |
2695 | retval = 0; | |
2696 | break; | |
2697 | } | |
2698 | } | |
2699 | if (retval) | |
2700 | goto fail; | |
2701 | ||
6b403b02 SS |
2702 | if (udev->descriptor.bMaxPacketSize0 == 0xff || |
2703 | udev->speed == USB_SPEED_SUPER) | |
2704 | i = 512; | |
2705 | else | |
2706 | i = udev->descriptor.bMaxPacketSize0; | |
1da177e4 LT |
2707 | if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) { |
2708 | if (udev->speed != USB_SPEED_FULL || | |
2709 | !(i == 8 || i == 16 || i == 32 || i == 64)) { | |
2710 | dev_err(&udev->dev, "ep0 maxpacket = %d\n", i); | |
2711 | retval = -EMSGSIZE; | |
2712 | goto fail; | |
2713 | } | |
2714 | dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); | |
2715 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); | |
fc721f51 | 2716 | usb_ep0_reinit(udev); |
1da177e4 LT |
2717 | } |
2718 | ||
2719 | retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); | |
2720 | if (retval < (signed)sizeof(udev->descriptor)) { | |
b9cef6c3 WF |
2721 | dev_err(&udev->dev, "device descriptor read/all, error %d\n", |
2722 | retval); | |
1da177e4 LT |
2723 | if (retval >= 0) |
2724 | retval = -ENOMSG; | |
2725 | goto fail; | |
2726 | } | |
2727 | ||
2728 | retval = 0; | |
2729 | ||
2730 | fail: | |
4326ed0b | 2731 | if (retval) { |
1da177e4 | 2732 | hub_port_disable(hub, port1, 0); |
4953d141 | 2733 | update_address(udev, devnum); /* for disconnect processing */ |
4326ed0b | 2734 | } |
4186ecf8 | 2735 | mutex_unlock(&usb_address0_mutex); |
1da177e4 LT |
2736 | return retval; |
2737 | } | |
2738 | ||
2739 | static void | |
2740 | check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) | |
2741 | { | |
2742 | struct usb_qualifier_descriptor *qual; | |
2743 | int status; | |
2744 | ||
e94b1766 | 2745 | qual = kmalloc (sizeof *qual, GFP_KERNEL); |
1da177e4 LT |
2746 | if (qual == NULL) |
2747 | return; | |
2748 | ||
2749 | status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, | |
2750 | qual, sizeof *qual); | |
2751 | if (status == sizeof *qual) { | |
2752 | dev_info(&udev->dev, "not running at top speed; " | |
2753 | "connect to a high speed hub\n"); | |
2754 | /* hub LEDs are probably harder to miss than syslog */ | |
2755 | if (hub->has_indicators) { | |
2756 | hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; | |
c4028958 | 2757 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
2758 | } |
2759 | } | |
1bc3c9e1 | 2760 | kfree(qual); |
1da177e4 LT |
2761 | } |
2762 | ||
2763 | static unsigned | |
2764 | hub_power_remaining (struct usb_hub *hub) | |
2765 | { | |
2766 | struct usb_device *hdev = hub->hdev; | |
2767 | int remaining; | |
55c52718 | 2768 | int port1; |
1da177e4 | 2769 | |
55c52718 | 2770 | if (!hub->limited_power) |
1da177e4 LT |
2771 | return 0; |
2772 | ||
55c52718 AS |
2773 | remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
2774 | for (port1 = 1; port1 <= hdev->maxchild; ++port1) { | |
2775 | struct usb_device *udev = hdev->children[port1 - 1]; | |
2776 | int delta; | |
1da177e4 LT |
2777 | |
2778 | if (!udev) | |
2779 | continue; | |
2780 | ||
55c52718 AS |
2781 | /* Unconfigured devices may not use more than 100mA, |
2782 | * or 8mA for OTG ports */ | |
1da177e4 | 2783 | if (udev->actconfig) |
55c52718 AS |
2784 | delta = udev->actconfig->desc.bMaxPower * 2; |
2785 | else if (port1 != udev->bus->otg_port || hdev->parent) | |
2786 | delta = 100; | |
1da177e4 | 2787 | else |
55c52718 AS |
2788 | delta = 8; |
2789 | if (delta > hub->mA_per_port) | |
b9cef6c3 WF |
2790 | dev_warn(&udev->dev, |
2791 | "%dmA is over %umA budget for port %d!\n", | |
2792 | delta, hub->mA_per_port, port1); | |
1da177e4 LT |
2793 | remaining -= delta; |
2794 | } | |
2795 | if (remaining < 0) { | |
55c52718 AS |
2796 | dev_warn(hub->intfdev, "%dmA over power budget!\n", |
2797 | - remaining); | |
1da177e4 LT |
2798 | remaining = 0; |
2799 | } | |
2800 | return remaining; | |
2801 | } | |
2802 | ||
2803 | /* Handle physical or logical connection change events. | |
2804 | * This routine is called when: | |
2805 | * a port connection-change occurs; | |
2806 | * a port enable-change occurs (often caused by EMI); | |
742120c6 | 2807 | * usb_reset_and_verify_device() encounters changed descriptors (as from |
1da177e4 LT |
2808 | * a firmware download) |
2809 | * caller already locked the hub | |
2810 | */ | |
2811 | static void hub_port_connect_change(struct usb_hub *hub, int port1, | |
2812 | u16 portstatus, u16 portchange) | |
2813 | { | |
2814 | struct usb_device *hdev = hub->hdev; | |
2815 | struct device *hub_dev = hub->intfdev; | |
90da096e | 2816 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
24618b0c AS |
2817 | unsigned wHubCharacteristics = |
2818 | le16_to_cpu(hub->descriptor->wHubCharacteristics); | |
8808f00c | 2819 | struct usb_device *udev; |
1da177e4 | 2820 | int status, i; |
24618b0c | 2821 | |
1da177e4 LT |
2822 | dev_dbg (hub_dev, |
2823 | "port %d, status %04x, change %04x, %s\n", | |
2824 | port1, portstatus, portchange, portspeed (portstatus)); | |
2825 | ||
2826 | if (hub->has_indicators) { | |
2827 | set_port_led(hub, port1, HUB_LED_AUTO); | |
2828 | hub->indicator[port1-1] = INDICATOR_AUTO; | |
2829 | } | |
1da177e4 LT |
2830 | |
2831 | #ifdef CONFIG_USB_OTG | |
2832 | /* during HNP, don't repeat the debounce */ | |
2833 | if (hdev->bus->is_b_host) | |
24618b0c AS |
2834 | portchange &= ~(USB_PORT_STAT_C_CONNECTION | |
2835 | USB_PORT_STAT_C_ENABLE); | |
1da177e4 LT |
2836 | #endif |
2837 | ||
8808f00c AS |
2838 | /* Try to resuscitate an existing device */ |
2839 | udev = hdev->children[port1-1]; | |
2840 | if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && | |
2841 | udev->state != USB_STATE_NOTATTACHED) { | |
8808f00c AS |
2842 | usb_lock_device(udev); |
2843 | if (portstatus & USB_PORT_STAT_ENABLE) { | |
2844 | status = 0; /* Nothing to do */ | |
8808f00c AS |
2845 | |
2846 | #ifdef CONFIG_USB_SUSPEND | |
5257d97a AS |
2847 | } else if (udev->state == USB_STATE_SUSPENDED && |
2848 | udev->persist_enabled) { | |
8808f00c AS |
2849 | /* For a suspended device, treat this as a |
2850 | * remote wakeup event. | |
2851 | */ | |
2852 | if (udev->do_remote_wakeup) | |
2853 | status = remote_wakeup(udev); | |
2854 | ||
2855 | /* Otherwise leave it be; devices can't tell the | |
2856 | * difference between suspended and disabled. | |
2857 | */ | |
2858 | else | |
2859 | status = 0; | |
2860 | #endif | |
2861 | ||
2862 | } else { | |
5257d97a | 2863 | status = -ENODEV; /* Don't resuscitate */ |
8808f00c AS |
2864 | } |
2865 | usb_unlock_device(udev); | |
2866 | ||
2867 | if (status == 0) { | |
2868 | clear_bit(port1, hub->change_bits); | |
2869 | return; | |
2870 | } | |
2871 | } | |
2872 | ||
24618b0c | 2873 | /* Disconnect any existing devices under this port */ |
8808f00c | 2874 | if (udev) |
24618b0c AS |
2875 | usb_disconnect(&hdev->children[port1-1]); |
2876 | clear_bit(port1, hub->change_bits); | |
2877 | ||
5257d97a AS |
2878 | if (portchange & (USB_PORT_STAT_C_CONNECTION | |
2879 | USB_PORT_STAT_C_ENABLE)) { | |
2880 | status = hub_port_debounce(hub, port1); | |
2881 | if (status < 0) { | |
2882 | if (printk_ratelimit()) | |
2883 | dev_err(hub_dev, "connect-debounce failed, " | |
2884 | "port %d disabled\n", port1); | |
2885 | portstatus &= ~USB_PORT_STAT_CONNECTION; | |
2886 | } else { | |
2887 | portstatus = status; | |
2888 | } | |
2889 | } | |
2890 | ||
24618b0c | 2891 | /* Return now if debouncing failed or nothing is connected */ |
1da177e4 LT |
2892 | if (!(portstatus & USB_PORT_STAT_CONNECTION)) { |
2893 | ||
2894 | /* maybe switch power back on (e.g. root hub was reset) */ | |
74ad9bd2 | 2895 | if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 |
1da177e4 LT |
2896 | && !(portstatus & (1 << USB_PORT_FEAT_POWER))) |
2897 | set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); | |
5257d97a | 2898 | |
1da177e4 LT |
2899 | if (portstatus & USB_PORT_STAT_ENABLE) |
2900 | goto done; | |
2901 | return; | |
2902 | } | |
2903 | ||
1da177e4 | 2904 | for (i = 0; i < SET_CONFIG_TRIES; i++) { |
1da177e4 LT |
2905 | |
2906 | /* reallocate for each attempt, since references | |
2907 | * to the previous one can escape in various ways | |
2908 | */ | |
2909 | udev = usb_alloc_dev(hdev, hdev->bus, port1); | |
2910 | if (!udev) { | |
2911 | dev_err (hub_dev, | |
2912 | "couldn't allocate port %d usb_device\n", | |
2913 | port1); | |
2914 | goto done; | |
2915 | } | |
2916 | ||
2917 | usb_set_device_state(udev, USB_STATE_POWERED); | |
55c52718 | 2918 | udev->bus_mA = hub->mA_per_port; |
b6956ffa | 2919 | udev->level = hdev->level + 1; |
8af548dc | 2920 | udev->wusb = hub_is_wusb(hub); |
55c52718 | 2921 | |
e7b77172 SS |
2922 | /* |
2923 | * USB 3.0 devices are reset automatically before the connect | |
2924 | * port status change appears, and the root hub port status | |
2925 | * shows the correct speed. We also get port change | |
2926 | * notifications for USB 3.0 devices from the USB 3.0 portion of | |
2927 | * an external USB 3.0 hub, but this isn't handled correctly yet | |
2928 | * FIXME. | |
2929 | */ | |
2930 | ||
2931 | if (!(hcd->driver->flags & HCD_USB3)) | |
2932 | udev->speed = USB_SPEED_UNKNOWN; | |
2933 | else if ((hdev->parent == NULL) && | |
2934 | (portstatus & (1 << USB_PORT_FEAT_SUPERSPEED))) | |
2935 | udev->speed = USB_SPEED_SUPER; | |
2936 | else | |
2937 | udev->speed = USB_SPEED_UNKNOWN; | |
2938 | ||
c6515272 SS |
2939 | /* |
2940 | * xHCI needs to issue an address device command later | |
2941 | * in the hub_port_init sequence for SS/HS/FS/LS devices. | |
2942 | */ | |
2943 | if (!(hcd->driver->flags & HCD_USB3)) { | |
2944 | /* set the address */ | |
2945 | choose_address(udev); | |
2946 | if (udev->devnum <= 0) { | |
2947 | status = -ENOTCONN; /* Don't retry */ | |
2948 | goto loop; | |
2949 | } | |
2950 | } | |
2951 | ||
e7b77172 | 2952 | /* reset (non-USB 3.0 devices) and get descriptor */ |
1da177e4 LT |
2953 | status = hub_port_init(hub, udev, port1, i); |
2954 | if (status < 0) | |
2955 | goto loop; | |
2956 | ||
2957 | /* consecutive bus-powered hubs aren't reliable; they can | |
2958 | * violate the voltage drop budget. if the new child has | |
2959 | * a "powered" LED, users should notice we didn't enable it | |
2960 | * (without reading syslog), even without per-port LEDs | |
2961 | * on the parent. | |
2962 | */ | |
2963 | if (udev->descriptor.bDeviceClass == USB_CLASS_HUB | |
55c52718 | 2964 | && udev->bus_mA <= 100) { |
1da177e4 LT |
2965 | u16 devstat; |
2966 | ||
2967 | status = usb_get_status(udev, USB_RECIP_DEVICE, 0, | |
2968 | &devstat); | |
55c52718 | 2969 | if (status < 2) { |
1da177e4 LT |
2970 | dev_dbg(&udev->dev, "get status %d ?\n", status); |
2971 | goto loop_disable; | |
2972 | } | |
55c52718 | 2973 | le16_to_cpus(&devstat); |
1da177e4 LT |
2974 | if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
2975 | dev_err(&udev->dev, | |
2976 | "can't connect bus-powered hub " | |
2977 | "to this port\n"); | |
2978 | if (hub->has_indicators) { | |
2979 | hub->indicator[port1-1] = | |
2980 | INDICATOR_AMBER_BLINK; | |
c4028958 | 2981 | schedule_delayed_work (&hub->leds, 0); |
1da177e4 LT |
2982 | } |
2983 | status = -ENOTCONN; /* Don't retry */ | |
2984 | goto loop_disable; | |
2985 | } | |
2986 | } | |
2987 | ||
2988 | /* check for devices running slower than they could */ | |
2989 | if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 | |
2990 | && udev->speed == USB_SPEED_FULL | |
2991 | && highspeed_hubs != 0) | |
2992 | check_highspeed (hub, udev, port1); | |
2993 | ||
2994 | /* Store the parent's children[] pointer. At this point | |
2995 | * udev becomes globally accessible, although presumably | |
2996 | * no one will look at it until hdev is unlocked. | |
2997 | */ | |
1da177e4 LT |
2998 | status = 0; |
2999 | ||
3000 | /* We mustn't add new devices if the parent hub has | |
3001 | * been disconnected; we would race with the | |
3002 | * recursively_mark_NOTATTACHED() routine. | |
3003 | */ | |
3004 | spin_lock_irq(&device_state_lock); | |
3005 | if (hdev->state == USB_STATE_NOTATTACHED) | |
3006 | status = -ENOTCONN; | |
3007 | else | |
3008 | hdev->children[port1-1] = udev; | |
3009 | spin_unlock_irq(&device_state_lock); | |
3010 | ||
3011 | /* Run it through the hoops (find a driver, etc) */ | |
3012 | if (!status) { | |
3013 | status = usb_new_device(udev); | |
3014 | if (status) { | |
3015 | spin_lock_irq(&device_state_lock); | |
3016 | hdev->children[port1-1] = NULL; | |
3017 | spin_unlock_irq(&device_state_lock); | |
3018 | } | |
3019 | } | |
3020 | ||
1da177e4 LT |
3021 | if (status) |
3022 | goto loop_disable; | |
3023 | ||
3024 | status = hub_power_remaining(hub); | |
3025 | if (status) | |
55c52718 | 3026 | dev_dbg(hub_dev, "%dmA power budget left\n", status); |
1da177e4 LT |
3027 | |
3028 | return; | |
3029 | ||
3030 | loop_disable: | |
3031 | hub_port_disable(hub, port1, 1); | |
3032 | loop: | |
fc721f51 | 3033 | usb_ep0_reinit(udev); |
1da177e4 LT |
3034 | release_address(udev); |
3035 | usb_put_dev(udev); | |
ffcdc18d | 3036 | if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
1da177e4 LT |
3037 | break; |
3038 | } | |
3a31155c AS |
3039 | if (hub->hdev->parent || |
3040 | !hcd->driver->port_handed_over || | |
3041 | !(hcd->driver->port_handed_over)(hcd, port1)) | |
3042 | dev_err(hub_dev, "unable to enumerate USB device on port %d\n", | |
3043 | port1); | |
1da177e4 LT |
3044 | |
3045 | done: | |
3046 | hub_port_disable(hub, port1, 1); | |
90da096e BR |
3047 | if (hcd->driver->relinquish_port && !hub->hdev->parent) |
3048 | hcd->driver->relinquish_port(hcd, port1); | |
1da177e4 LT |
3049 | } |
3050 | ||
3051 | static void hub_events(void) | |
3052 | { | |
3053 | struct list_head *tmp; | |
3054 | struct usb_device *hdev; | |
3055 | struct usb_interface *intf; | |
3056 | struct usb_hub *hub; | |
3057 | struct device *hub_dev; | |
3058 | u16 hubstatus; | |
3059 | u16 hubchange; | |
3060 | u16 portstatus; | |
3061 | u16 portchange; | |
3062 | int i, ret; | |
3063 | int connect_change; | |
3064 | ||
3065 | /* | |
3066 | * We restart the list every time to avoid a deadlock with | |
3067 | * deleting hubs downstream from this one. This should be | |
3068 | * safe since we delete the hub from the event list. | |
3069 | * Not the most efficient, but avoids deadlocks. | |
3070 | */ | |
3071 | while (1) { | |
3072 | ||
3073 | /* Grab the first entry at the beginning of the list */ | |
3074 | spin_lock_irq(&hub_event_lock); | |
3075 | if (list_empty(&hub_event_list)) { | |
3076 | spin_unlock_irq(&hub_event_lock); | |
3077 | break; | |
3078 | } | |
3079 | ||
3080 | tmp = hub_event_list.next; | |
3081 | list_del_init(tmp); | |
3082 | ||
3083 | hub = list_entry(tmp, struct usb_hub, event_list); | |
e8054854 AS |
3084 | kref_get(&hub->kref); |
3085 | spin_unlock_irq(&hub_event_lock); | |
1da177e4 | 3086 | |
e8054854 AS |
3087 | hdev = hub->hdev; |
3088 | hub_dev = hub->intfdev; | |
3089 | intf = to_usb_interface(hub_dev); | |
40f122f3 | 3090 | dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
1da177e4 LT |
3091 | hdev->state, hub->descriptor |
3092 | ? hub->descriptor->bNbrPorts | |
3093 | : 0, | |
3094 | /* NOTE: expects max 15 ports... */ | |
3095 | (u16) hub->change_bits[0], | |
40f122f3 | 3096 | (u16) hub->event_bits[0]); |
1da177e4 | 3097 | |
1da177e4 LT |
3098 | /* Lock the device, then check to see if we were |
3099 | * disconnected while waiting for the lock to succeed. */ | |
06b84e8a | 3100 | usb_lock_device(hdev); |
e8054854 | 3101 | if (unlikely(hub->disconnected)) |
1da177e4 LT |
3102 | goto loop; |
3103 | ||
3104 | /* If the hub has died, clean up after it */ | |
3105 | if (hdev->state == USB_STATE_NOTATTACHED) { | |
7de18d8b | 3106 | hub->error = -ENODEV; |
4330354f | 3107 | hub_quiesce(hub, HUB_DISCONNECT); |
1da177e4 LT |
3108 | goto loop; |
3109 | } | |
3110 | ||
40f122f3 AS |
3111 | /* Autoresume */ |
3112 | ret = usb_autopm_get_interface(intf); | |
3113 | if (ret) { | |
3114 | dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); | |
3115 | goto loop; | |
3116 | } | |
a8e7c565 | 3117 | |
40f122f3 | 3118 | /* If this is an inactive hub, do nothing */ |
1da177e4 | 3119 | if (hub->quiescing) |
40f122f3 | 3120 | goto loop_autopm; |
1da177e4 LT |
3121 | |
3122 | if (hub->error) { | |
3123 | dev_dbg (hub_dev, "resetting for error %d\n", | |
3124 | hub->error); | |
3125 | ||
742120c6 | 3126 | ret = usb_reset_device(hdev); |
1da177e4 LT |
3127 | if (ret) { |
3128 | dev_dbg (hub_dev, | |
3129 | "error resetting hub: %d\n", ret); | |
40f122f3 | 3130 | goto loop_autopm; |
1da177e4 LT |
3131 | } |
3132 | ||
3133 | hub->nerrors = 0; | |
3134 | hub->error = 0; | |
3135 | } | |
3136 | ||
3137 | /* deal with port status changes */ | |
3138 | for (i = 1; i <= hub->descriptor->bNbrPorts; i++) { | |
3139 | if (test_bit(i, hub->busy_bits)) | |
3140 | continue; | |
3141 | connect_change = test_bit(i, hub->change_bits); | |
3142 | if (!test_and_clear_bit(i, hub->event_bits) && | |
6ee0b270 | 3143 | !connect_change) |
1da177e4 LT |
3144 | continue; |
3145 | ||
3146 | ret = hub_port_status(hub, i, | |
3147 | &portstatus, &portchange); | |
3148 | if (ret < 0) | |
3149 | continue; | |
3150 | ||
1da177e4 LT |
3151 | if (portchange & USB_PORT_STAT_C_CONNECTION) { |
3152 | clear_port_feature(hdev, i, | |
3153 | USB_PORT_FEAT_C_CONNECTION); | |
3154 | connect_change = 1; | |
3155 | } | |
3156 | ||
3157 | if (portchange & USB_PORT_STAT_C_ENABLE) { | |
3158 | if (!connect_change) | |
3159 | dev_dbg (hub_dev, | |
3160 | "port %d enable change, " | |
3161 | "status %08x\n", | |
3162 | i, portstatus); | |
3163 | clear_port_feature(hdev, i, | |
3164 | USB_PORT_FEAT_C_ENABLE); | |
3165 | ||
3166 | /* | |
3167 | * EM interference sometimes causes badly | |
3168 | * shielded USB devices to be shutdown by | |
3169 | * the hub, this hack enables them again. | |
3170 | * Works at least with mouse driver. | |
3171 | */ | |
3172 | if (!(portstatus & USB_PORT_STAT_ENABLE) | |
3173 | && !connect_change | |
3174 | && hdev->children[i-1]) { | |
3175 | dev_err (hub_dev, | |
3176 | "port %i " | |
3177 | "disabled by hub (EMI?), " | |
3178 | "re-enabling...\n", | |
3179 | i); | |
3180 | connect_change = 1; | |
3181 | } | |
3182 | } | |
3183 | ||
3184 | if (portchange & USB_PORT_STAT_C_SUSPEND) { | |
8808f00c AS |
3185 | struct usb_device *udev; |
3186 | ||
1da177e4 LT |
3187 | clear_port_feature(hdev, i, |
3188 | USB_PORT_FEAT_C_SUSPEND); | |
8808f00c AS |
3189 | udev = hdev->children[i-1]; |
3190 | if (udev) { | |
3191 | usb_lock_device(udev); | |
1da177e4 LT |
3192 | ret = remote_wakeup(hdev-> |
3193 | children[i-1]); | |
8808f00c | 3194 | usb_unlock_device(udev); |
1da177e4 LT |
3195 | if (ret < 0) |
3196 | connect_change = 1; | |
3197 | } else { | |
3198 | ret = -ENODEV; | |
3199 | hub_port_disable(hub, i, 1); | |
3200 | } | |
3201 | dev_dbg (hub_dev, | |
3202 | "resume on port %d, status %d\n", | |
3203 | i, ret); | |
3204 | } | |
3205 | ||
3206 | if (portchange & USB_PORT_STAT_C_OVERCURRENT) { | |
3207 | dev_err (hub_dev, | |
3208 | "over-current change on port %d\n", | |
3209 | i); | |
3210 | clear_port_feature(hdev, i, | |
3211 | USB_PORT_FEAT_C_OVER_CURRENT); | |
8520f380 | 3212 | hub_power_on(hub, true); |
1da177e4 LT |
3213 | } |
3214 | ||
3215 | if (portchange & USB_PORT_STAT_C_RESET) { | |
3216 | dev_dbg (hub_dev, | |
3217 | "reset change on port %d\n", | |
3218 | i); | |
3219 | clear_port_feature(hdev, i, | |
3220 | USB_PORT_FEAT_C_RESET); | |
3221 | } | |
3222 | ||
3223 | if (connect_change) | |
3224 | hub_port_connect_change(hub, i, | |
3225 | portstatus, portchange); | |
3226 | } /* end for i */ | |
3227 | ||
3228 | /* deal with hub status changes */ | |
3229 | if (test_and_clear_bit(0, hub->event_bits) == 0) | |
3230 | ; /* do nothing */ | |
3231 | else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) | |
3232 | dev_err (hub_dev, "get_hub_status failed\n"); | |
3233 | else { | |
3234 | if (hubchange & HUB_CHANGE_LOCAL_POWER) { | |
3235 | dev_dbg (hub_dev, "power change\n"); | |
3236 | clear_hub_feature(hdev, C_HUB_LOCAL_POWER); | |
55c52718 AS |
3237 | if (hubstatus & HUB_STATUS_LOCAL_POWER) |
3238 | /* FIXME: Is this always true? */ | |
55c52718 | 3239 | hub->limited_power = 1; |
403fae78 | 3240 | else |
3241 | hub->limited_power = 0; | |
1da177e4 LT |
3242 | } |
3243 | if (hubchange & HUB_CHANGE_OVERCURRENT) { | |
3244 | dev_dbg (hub_dev, "overcurrent change\n"); | |
3245 | msleep(500); /* Cool down */ | |
3246 | clear_hub_feature(hdev, C_HUB_OVER_CURRENT); | |
8520f380 | 3247 | hub_power_on(hub, true); |
1da177e4 LT |
3248 | } |
3249 | } | |
3250 | ||
40f122f3 AS |
3251 | loop_autopm: |
3252 | /* Allow autosuspend if we're not going to run again */ | |
3253 | if (list_empty(&hub->event_list)) | |
3254 | usb_autopm_enable(intf); | |
1da177e4 LT |
3255 | loop: |
3256 | usb_unlock_device(hdev); | |
e8054854 | 3257 | kref_put(&hub->kref, hub_release); |
1da177e4 LT |
3258 | |
3259 | } /* end while (1) */ | |
3260 | } | |
3261 | ||
3262 | static int hub_thread(void *__unused) | |
3263 | { | |
3bb1af52 AS |
3264 | /* khubd needs to be freezable to avoid intefering with USB-PERSIST |
3265 | * port handover. Otherwise it might see that a full-speed device | |
3266 | * was gone before the EHCI controller had handed its port over to | |
3267 | * the companion full-speed controller. | |
3268 | */ | |
83144186 | 3269 | set_freezable(); |
3bb1af52 | 3270 | |
1da177e4 LT |
3271 | do { |
3272 | hub_events(); | |
e42837bc | 3273 | wait_event_freezable(khubd_wait, |
9c8d6178 | 3274 | !list_empty(&hub_event_list) || |
3275 | kthread_should_stop()); | |
9c8d6178 | 3276 | } while (!kthread_should_stop() || !list_empty(&hub_event_list)); |
1da177e4 | 3277 | |
9c8d6178 | 3278 | pr_debug("%s: khubd exiting\n", usbcore_name); |
3279 | return 0; | |
1da177e4 LT |
3280 | } |
3281 | ||
3282 | static struct usb_device_id hub_id_table [] = { | |
3283 | { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, | |
3284 | .bDeviceClass = USB_CLASS_HUB}, | |
3285 | { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, | |
3286 | .bInterfaceClass = USB_CLASS_HUB}, | |
3287 | { } /* Terminating entry */ | |
3288 | }; | |
3289 | ||
3290 | MODULE_DEVICE_TABLE (usb, hub_id_table); | |
3291 | ||
3292 | static struct usb_driver hub_driver = { | |
1da177e4 LT |
3293 | .name = "hub", |
3294 | .probe = hub_probe, | |
3295 | .disconnect = hub_disconnect, | |
3296 | .suspend = hub_suspend, | |
3297 | .resume = hub_resume, | |
f07600cf | 3298 | .reset_resume = hub_reset_resume, |
7de18d8b AS |
3299 | .pre_reset = hub_pre_reset, |
3300 | .post_reset = hub_post_reset, | |
1da177e4 LT |
3301 | .ioctl = hub_ioctl, |
3302 | .id_table = hub_id_table, | |
40f122f3 | 3303 | .supports_autosuspend = 1, |
1da177e4 LT |
3304 | }; |
3305 | ||
3306 | int usb_hub_init(void) | |
3307 | { | |
1da177e4 LT |
3308 | if (usb_register(&hub_driver) < 0) { |
3309 | printk(KERN_ERR "%s: can't register hub driver\n", | |
3310 | usbcore_name); | |
3311 | return -1; | |
3312 | } | |
3313 | ||
9c8d6178 | 3314 | khubd_task = kthread_run(hub_thread, NULL, "khubd"); |
3315 | if (!IS_ERR(khubd_task)) | |
1da177e4 | 3316 | return 0; |
1da177e4 LT |
3317 | |
3318 | /* Fall through if kernel_thread failed */ | |
3319 | usb_deregister(&hub_driver); | |
3320 | printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); | |
3321 | ||
3322 | return -1; | |
3323 | } | |
3324 | ||
3325 | void usb_hub_cleanup(void) | |
3326 | { | |
9c8d6178 | 3327 | kthread_stop(khubd_task); |
1da177e4 LT |
3328 | |
3329 | /* | |
3330 | * Hub resources are freed for us by usb_deregister. It calls | |
3331 | * usb_driver_purge on every device which in turn calls that | |
3332 | * devices disconnect function if it is using this driver. | |
3333 | * The hub_disconnect function takes care of releasing the | |
3334 | * individual hub resources. -greg | |
3335 | */ | |
3336 | usb_deregister(&hub_driver); | |
3337 | } /* usb_hub_cleanup() */ | |
3338 | ||
eb764c4b AS |
3339 | static int descriptors_changed(struct usb_device *udev, |
3340 | struct usb_device_descriptor *old_device_descriptor) | |
3341 | { | |
3342 | int changed = 0; | |
3343 | unsigned index; | |
3344 | unsigned serial_len = 0; | |
3345 | unsigned len; | |
3346 | unsigned old_length; | |
3347 | int length; | |
3348 | char *buf; | |
3349 | ||
3350 | if (memcmp(&udev->descriptor, old_device_descriptor, | |
3351 | sizeof(*old_device_descriptor)) != 0) | |
3352 | return 1; | |
3353 | ||
3354 | /* Since the idVendor, idProduct, and bcdDevice values in the | |
3355 | * device descriptor haven't changed, we will assume the | |
3356 | * Manufacturer and Product strings haven't changed either. | |
3357 | * But the SerialNumber string could be different (e.g., a | |
3358 | * different flash card of the same brand). | |
3359 | */ | |
3360 | if (udev->serial) | |
3361 | serial_len = strlen(udev->serial) + 1; | |
1da177e4 | 3362 | |
eb764c4b | 3363 | len = serial_len; |
1da177e4 | 3364 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
eb764c4b AS |
3365 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
3366 | len = max(len, old_length); | |
1da177e4 | 3367 | } |
eb764c4b | 3368 | |
0cc1a51f | 3369 | buf = kmalloc(len, GFP_NOIO); |
1da177e4 LT |
3370 | if (buf == NULL) { |
3371 | dev_err(&udev->dev, "no mem to re-read configs after reset\n"); | |
3372 | /* assume the worst */ | |
3373 | return 1; | |
3374 | } | |
3375 | for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { | |
eb764c4b | 3376 | old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
1da177e4 LT |
3377 | length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
3378 | old_length); | |
eb764c4b | 3379 | if (length != old_length) { |
1da177e4 LT |
3380 | dev_dbg(&udev->dev, "config index %d, error %d\n", |
3381 | index, length); | |
eb764c4b | 3382 | changed = 1; |
1da177e4 LT |
3383 | break; |
3384 | } | |
3385 | if (memcmp (buf, udev->rawdescriptors[index], old_length) | |
3386 | != 0) { | |
3387 | dev_dbg(&udev->dev, "config index %d changed (#%d)\n", | |
eb764c4b AS |
3388 | index, |
3389 | ((struct usb_config_descriptor *) buf)-> | |
3390 | bConfigurationValue); | |
3391 | changed = 1; | |
1da177e4 LT |
3392 | break; |
3393 | } | |
3394 | } | |
eb764c4b AS |
3395 | |
3396 | if (!changed && serial_len) { | |
3397 | length = usb_string(udev, udev->descriptor.iSerialNumber, | |
3398 | buf, serial_len); | |
3399 | if (length + 1 != serial_len) { | |
3400 | dev_dbg(&udev->dev, "serial string error %d\n", | |
3401 | length); | |
3402 | changed = 1; | |
3403 | } else if (memcmp(buf, udev->serial, length) != 0) { | |
3404 | dev_dbg(&udev->dev, "serial string changed\n"); | |
3405 | changed = 1; | |
3406 | } | |
3407 | } | |
3408 | ||
1da177e4 | 3409 | kfree(buf); |
eb764c4b | 3410 | return changed; |
1da177e4 LT |
3411 | } |
3412 | ||
3413 | /** | |
742120c6 | 3414 | * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device |
1da177e4 LT |
3415 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
3416 | * | |
79efa097 AS |
3417 | * WARNING - don't use this routine to reset a composite device |
3418 | * (one with multiple interfaces owned by separate drivers)! | |
742120c6 | 3419 | * Use usb_reset_device() instead. |
1da177e4 LT |
3420 | * |
3421 | * Do a port reset, reassign the device's address, and establish its | |
3422 | * former operating configuration. If the reset fails, or the device's | |
3423 | * descriptors change from their values before the reset, or the original | |
3424 | * configuration and altsettings cannot be restored, a flag will be set | |
3425 | * telling khubd to pretend the device has been disconnected and then | |
3426 | * re-connected. All drivers will be unbound, and the device will be | |
3427 | * re-enumerated and probed all over again. | |
3428 | * | |
3429 | * Returns 0 if the reset succeeded, -ENODEV if the device has been | |
3430 | * flagged for logical disconnection, or some other negative error code | |
3431 | * if the reset wasn't even attempted. | |
3432 | * | |
3433 | * The caller must own the device lock. For example, it's safe to use | |
3434 | * this from a driver probe() routine after downloading new firmware. | |
3435 | * For calls that might not occur during probe(), drivers should lock | |
3436 | * the device using usb_lock_device_for_reset(). | |
6bc6cff5 AS |
3437 | * |
3438 | * Locking exception: This routine may also be called from within an | |
3439 | * autoresume handler. Such usage won't conflict with other tasks | |
3440 | * holding the device lock because these tasks should always call | |
3441 | * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. | |
1da177e4 | 3442 | */ |
742120c6 | 3443 | static int usb_reset_and_verify_device(struct usb_device *udev) |
1da177e4 LT |
3444 | { |
3445 | struct usb_device *parent_hdev = udev->parent; | |
3446 | struct usb_hub *parent_hub; | |
3447 | struct usb_device_descriptor descriptor = udev->descriptor; | |
12c3da34 AS |
3448 | int i, ret = 0; |
3449 | int port1 = udev->portnum; | |
1da177e4 LT |
3450 | |
3451 | if (udev->state == USB_STATE_NOTATTACHED || | |
3452 | udev->state == USB_STATE_SUSPENDED) { | |
3453 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
3454 | udev->state); | |
3455 | return -EINVAL; | |
3456 | } | |
3457 | ||
3458 | if (!parent_hdev) { | |
3459 | /* this requires hcd-specific logic; see OHCI hc_restart() */ | |
441b62c1 | 3460 | dev_dbg(&udev->dev, "%s for root hub!\n", __func__); |
1da177e4 LT |
3461 | return -EISDIR; |
3462 | } | |
1da177e4 LT |
3463 | parent_hub = hdev_to_hub(parent_hdev); |
3464 | ||
1da177e4 LT |
3465 | set_bit(port1, parent_hub->busy_bits); |
3466 | for (i = 0; i < SET_CONFIG_TRIES; ++i) { | |
3467 | ||
3468 | /* ep0 maxpacket size may change; let the HCD know about it. | |
3469 | * Other endpoints will be handled by re-enumeration. */ | |
fc721f51 | 3470 | usb_ep0_reinit(udev); |
1da177e4 | 3471 | ret = hub_port_init(parent_hub, udev, port1, i); |
dd4dd19e | 3472 | if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
1da177e4 LT |
3473 | break; |
3474 | } | |
3475 | clear_bit(port1, parent_hub->busy_bits); | |
d5cbad4b | 3476 | |
1da177e4 LT |
3477 | if (ret < 0) |
3478 | goto re_enumerate; | |
3479 | ||
3480 | /* Device might have changed firmware (DFU or similar) */ | |
eb764c4b | 3481 | if (descriptors_changed(udev, &descriptor)) { |
1da177e4 LT |
3482 | dev_info(&udev->dev, "device firmware changed\n"); |
3483 | udev->descriptor = descriptor; /* for disconnect() calls */ | |
3484 | goto re_enumerate; | |
3485 | } | |
4fe0387a AS |
3486 | |
3487 | /* Restore the device's previous configuration */ | |
1da177e4 LT |
3488 | if (!udev->actconfig) |
3489 | goto done; | |
1da177e4 LT |
3490 | ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
3491 | USB_REQ_SET_CONFIGURATION, 0, | |
3492 | udev->actconfig->desc.bConfigurationValue, 0, | |
3493 | NULL, 0, USB_CTRL_SET_TIMEOUT); | |
3494 | if (ret < 0) { | |
3495 | dev_err(&udev->dev, | |
3496 | "can't restore configuration #%d (error=%d)\n", | |
3497 | udev->actconfig->desc.bConfigurationValue, ret); | |
3498 | goto re_enumerate; | |
3499 | } | |
3500 | usb_set_device_state(udev, USB_STATE_CONFIGURED); | |
3501 | ||
4fe0387a AS |
3502 | /* Put interfaces back into the same altsettings as before. |
3503 | * Don't bother to send the Set-Interface request for interfaces | |
3504 | * that were already in altsetting 0; besides being unnecessary, | |
3505 | * many devices can't handle it. Instead just reset the host-side | |
3506 | * endpoint state. | |
3507 | */ | |
1da177e4 LT |
3508 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
3509 | struct usb_interface *intf = udev->actconfig->interface[i]; | |
3510 | struct usb_interface_descriptor *desc; | |
3511 | ||
1da177e4 | 3512 | desc = &intf->cur_altsetting->desc; |
4fe0387a AS |
3513 | if (desc->bAlternateSetting == 0) { |
3514 | usb_disable_interface(udev, intf, true); | |
3515 | usb_enable_interface(udev, intf, true); | |
3516 | ret = 0; | |
3517 | } else { | |
3518 | ret = usb_set_interface(udev, desc->bInterfaceNumber, | |
3519 | desc->bAlternateSetting); | |
3520 | } | |
1da177e4 LT |
3521 | if (ret < 0) { |
3522 | dev_err(&udev->dev, "failed to restore interface %d " | |
3523 | "altsetting %d (error=%d)\n", | |
3524 | desc->bInterfaceNumber, | |
3525 | desc->bAlternateSetting, | |
3526 | ret); | |
3527 | goto re_enumerate; | |
3528 | } | |
3529 | } | |
3530 | ||
3531 | done: | |
1da177e4 LT |
3532 | return 0; |
3533 | ||
3534 | re_enumerate: | |
3535 | hub_port_logical_disconnect(parent_hub, port1); | |
3536 | return -ENODEV; | |
3537 | } | |
79efa097 AS |
3538 | |
3539 | /** | |
742120c6 | 3540 | * usb_reset_device - warn interface drivers and perform a USB port reset |
79efa097 | 3541 | * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
79efa097 AS |
3542 | * |
3543 | * Warns all drivers bound to registered interfaces (using their pre_reset | |
3544 | * method), performs the port reset, and then lets the drivers know that | |
3545 | * the reset is over (using their post_reset method). | |
3546 | * | |
742120c6 | 3547 | * Return value is the same as for usb_reset_and_verify_device(). |
79efa097 AS |
3548 | * |
3549 | * The caller must own the device lock. For example, it's safe to use | |
3550 | * this from a driver probe() routine after downloading new firmware. | |
3551 | * For calls that might not occur during probe(), drivers should lock | |
3552 | * the device using usb_lock_device_for_reset(). | |
78d9a487 AS |
3553 | * |
3554 | * If an interface is currently being probed or disconnected, we assume | |
3555 | * its driver knows how to handle resets. For all other interfaces, | |
3556 | * if the driver doesn't have pre_reset and post_reset methods then | |
3557 | * we attempt to unbind it and rebind afterward. | |
79efa097 | 3558 | */ |
742120c6 | 3559 | int usb_reset_device(struct usb_device *udev) |
79efa097 AS |
3560 | { |
3561 | int ret; | |
852c4b43 | 3562 | int i; |
79efa097 AS |
3563 | struct usb_host_config *config = udev->actconfig; |
3564 | ||
3565 | if (udev->state == USB_STATE_NOTATTACHED || | |
3566 | udev->state == USB_STATE_SUSPENDED) { | |
3567 | dev_dbg(&udev->dev, "device reset not allowed in state %d\n", | |
3568 | udev->state); | |
3569 | return -EINVAL; | |
3570 | } | |
3571 | ||
645daaab | 3572 | /* Prevent autosuspend during the reset */ |
94fcda1f | 3573 | usb_autoresume_device(udev); |
645daaab | 3574 | |
79efa097 | 3575 | if (config) { |
79efa097 | 3576 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
852c4b43 AS |
3577 | struct usb_interface *cintf = config->interface[i]; |
3578 | struct usb_driver *drv; | |
78d9a487 | 3579 | int unbind = 0; |
852c4b43 AS |
3580 | |
3581 | if (cintf->dev.driver) { | |
79efa097 | 3582 | drv = to_usb_driver(cintf->dev.driver); |
78d9a487 AS |
3583 | if (drv->pre_reset && drv->post_reset) |
3584 | unbind = (drv->pre_reset)(cintf); | |
3585 | else if (cintf->condition == | |
3586 | USB_INTERFACE_BOUND) | |
3587 | unbind = 1; | |
3588 | if (unbind) | |
3589 | usb_forced_unbind_intf(cintf); | |
79efa097 AS |
3590 | } |
3591 | } | |
3592 | } | |
3593 | ||
742120c6 | 3594 | ret = usb_reset_and_verify_device(udev); |
79efa097 AS |
3595 | |
3596 | if (config) { | |
79efa097 | 3597 | for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
852c4b43 AS |
3598 | struct usb_interface *cintf = config->interface[i]; |
3599 | struct usb_driver *drv; | |
78d9a487 | 3600 | int rebind = cintf->needs_binding; |
852c4b43 | 3601 | |
78d9a487 | 3602 | if (!rebind && cintf->dev.driver) { |
79efa097 AS |
3603 | drv = to_usb_driver(cintf->dev.driver); |
3604 | if (drv->post_reset) | |
78d9a487 AS |
3605 | rebind = (drv->post_reset)(cintf); |
3606 | else if (cintf->condition == | |
3607 | USB_INTERFACE_BOUND) | |
3608 | rebind = 1; | |
79efa097 | 3609 | } |
6c640945 | 3610 | if (ret == 0 && rebind) |
78d9a487 | 3611 | usb_rebind_intf(cintf); |
79efa097 AS |
3612 | } |
3613 | } | |
3614 | ||
94fcda1f | 3615 | usb_autosuspend_device(udev); |
79efa097 AS |
3616 | return ret; |
3617 | } | |
742120c6 | 3618 | EXPORT_SYMBOL_GPL(usb_reset_device); |
dc023dce IPG |
3619 | |
3620 | ||
3621 | /** | |
3622 | * usb_queue_reset_device - Reset a USB device from an atomic context | |
3623 | * @iface: USB interface belonging to the device to reset | |
3624 | * | |
3625 | * This function can be used to reset a USB device from an atomic | |
3626 | * context, where usb_reset_device() won't work (as it blocks). | |
3627 | * | |
3628 | * Doing a reset via this method is functionally equivalent to calling | |
3629 | * usb_reset_device(), except for the fact that it is delayed to a | |
3630 | * workqueue. This means that any drivers bound to other interfaces | |
3631 | * might be unbound, as well as users from usbfs in user space. | |
3632 | * | |
3633 | * Corner cases: | |
3634 | * | |
3635 | * - Scheduling two resets at the same time from two different drivers | |
3636 | * attached to two different interfaces of the same device is | |
3637 | * possible; depending on how the driver attached to each interface | |
3638 | * handles ->pre_reset(), the second reset might happen or not. | |
3639 | * | |
3640 | * - If a driver is unbound and it had a pending reset, the reset will | |
3641 | * be cancelled. | |
3642 | * | |
3643 | * - This function can be called during .probe() or .disconnect() | |
3644 | * times. On return from .disconnect(), any pending resets will be | |
3645 | * cancelled. | |
3646 | * | |
3647 | * There is no no need to lock/unlock the @reset_ws as schedule_work() | |
3648 | * does its own. | |
3649 | * | |
3650 | * NOTE: We don't do any reference count tracking because it is not | |
3651 | * needed. The lifecycle of the work_struct is tied to the | |
3652 | * usb_interface. Before destroying the interface we cancel the | |
3653 | * work_struct, so the fact that work_struct is queued and or | |
3654 | * running means the interface (and thus, the device) exist and | |
3655 | * are referenced. | |
3656 | */ | |
3657 | void usb_queue_reset_device(struct usb_interface *iface) | |
3658 | { | |
3659 | schedule_work(&iface->reset_ws); | |
3660 | } | |
3661 | EXPORT_SYMBOL_GPL(usb_queue_reset_device); |