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1 | #ifndef __LINUX_USB_H |
2 | #define __LINUX_USB_H | |
3 | ||
4 | #include <linux/mod_devicetable.h> | |
5 | #include <linux/usb_ch9.h> | |
6 | ||
7 | #define USB_MAJOR 180 | |
8 | ||
9 | ||
10 | #ifdef __KERNEL__ | |
11 | ||
12 | #include <linux/config.h> | |
13 | #include <linux/errno.h> /* for -ENODEV */ | |
14 | #include <linux/delay.h> /* for mdelay() */ | |
15 | #include <linux/interrupt.h> /* for in_interrupt() */ | |
16 | #include <linux/list.h> /* for struct list_head */ | |
17 | #include <linux/kref.h> /* for struct kref */ | |
18 | #include <linux/device.h> /* for struct device */ | |
19 | #include <linux/fs.h> /* for struct file_operations */ | |
20 | #include <linux/completion.h> /* for struct completion */ | |
21 | #include <linux/sched.h> /* for current && schedule_timeout */ | |
22 | ||
23 | struct usb_device; | |
24 | struct usb_driver; | |
25 | ||
26 | /*-------------------------------------------------------------------------*/ | |
27 | ||
28 | /* | |
29 | * Host-side wrappers for standard USB descriptors ... these are parsed | |
30 | * from the data provided by devices. Parsing turns them from a flat | |
31 | * sequence of descriptors into a hierarchy: | |
32 | * | |
33 | * - devices have one (usually) or more configs; | |
34 | * - configs have one (often) or more interfaces; | |
35 | * - interfaces have one (usually) or more settings; | |
36 | * - each interface setting has zero or (usually) more endpoints. | |
37 | * | |
38 | * And there might be other descriptors mixed in with those. | |
39 | * | |
40 | * Devices may also have class-specific or vendor-specific descriptors. | |
41 | */ | |
42 | ||
43 | /** | |
44 | * struct usb_host_endpoint - host-side endpoint descriptor and queue | |
45 | * @desc: descriptor for this endpoint, wMaxPacketSize in native byteorder | |
46 | * @urb_list: urbs queued to this endpoint; maintained by usbcore | |
47 | * @hcpriv: for use by HCD; typically holds hardware dma queue head (QH) | |
48 | * with one or more transfer descriptors (TDs) per urb | |
49 | * @extra: descriptors following this endpoint in the configuration | |
50 | * @extralen: how many bytes of "extra" are valid | |
51 | * | |
52 | * USB requests are always queued to a given endpoint, identified by a | |
53 | * descriptor within an active interface in a given USB configuration. | |
54 | */ | |
55 | struct usb_host_endpoint { | |
56 | struct usb_endpoint_descriptor desc; | |
57 | struct list_head urb_list; | |
58 | void *hcpriv; | |
59 | ||
60 | unsigned char *extra; /* Extra descriptors */ | |
61 | int extralen; | |
62 | }; | |
63 | ||
64 | /* host-side wrapper for one interface setting's parsed descriptors */ | |
65 | struct usb_host_interface { | |
66 | struct usb_interface_descriptor desc; | |
67 | ||
68 | /* array of desc.bNumEndpoint endpoints associated with this | |
69 | * interface setting. these will be in no particular order. | |
70 | */ | |
71 | struct usb_host_endpoint *endpoint; | |
72 | ||
73 | char *string; /* iInterface string, if present */ | |
74 | unsigned char *extra; /* Extra descriptors */ | |
75 | int extralen; | |
76 | }; | |
77 | ||
78 | enum usb_interface_condition { | |
79 | USB_INTERFACE_UNBOUND = 0, | |
80 | USB_INTERFACE_BINDING, | |
81 | USB_INTERFACE_BOUND, | |
82 | USB_INTERFACE_UNBINDING, | |
83 | }; | |
84 | ||
85 | /** | |
86 | * struct usb_interface - what usb device drivers talk to | |
87 | * @altsetting: array of interface structures, one for each alternate | |
88 | * setting that may be selected. Each one includes a set of | |
89 | * endpoint configurations. They will be in no particular order. | |
90 | * @num_altsetting: number of altsettings defined. | |
91 | * @cur_altsetting: the current altsetting. | |
92 | * @driver: the USB driver that is bound to this interface. | |
93 | * @minor: the minor number assigned to this interface, if this | |
94 | * interface is bound to a driver that uses the USB major number. | |
95 | * If this interface does not use the USB major, this field should | |
96 | * be unused. The driver should set this value in the probe() | |
97 | * function of the driver, after it has been assigned a minor | |
98 | * number from the USB core by calling usb_register_dev(). | |
99 | * @condition: binding state of the interface: not bound, binding | |
100 | * (in probe()), bound to a driver, or unbinding (in disconnect()) | |
101 | * @dev: driver model's view of this device | |
102 | * @class_dev: driver model's class view of this device. | |
103 | * | |
104 | * USB device drivers attach to interfaces on a physical device. Each | |
105 | * interface encapsulates a single high level function, such as feeding | |
106 | * an audio stream to a speaker or reporting a change in a volume control. | |
107 | * Many USB devices only have one interface. The protocol used to talk to | |
108 | * an interface's endpoints can be defined in a usb "class" specification, | |
109 | * or by a product's vendor. The (default) control endpoint is part of | |
110 | * every interface, but is never listed among the interface's descriptors. | |
111 | * | |
112 | * The driver that is bound to the interface can use standard driver model | |
113 | * calls such as dev_get_drvdata() on the dev member of this structure. | |
114 | * | |
115 | * Each interface may have alternate settings. The initial configuration | |
116 | * of a device sets altsetting 0, but the device driver can change | |
117 | * that setting using usb_set_interface(). Alternate settings are often | |
118 | * used to control the the use of periodic endpoints, such as by having | |
119 | * different endpoints use different amounts of reserved USB bandwidth. | |
120 | * All standards-conformant USB devices that use isochronous endpoints | |
121 | * will use them in non-default settings. | |
122 | * | |
123 | * The USB specification says that alternate setting numbers must run from | |
124 | * 0 to one less than the total number of alternate settings. But some | |
125 | * devices manage to mess this up, and the structures aren't necessarily | |
126 | * stored in numerical order anyhow. Use usb_altnum_to_altsetting() to | |
127 | * look up an alternate setting in the altsetting array based on its number. | |
128 | */ | |
129 | struct usb_interface { | |
130 | /* array of alternate settings for this interface, | |
131 | * stored in no particular order */ | |
132 | struct usb_host_interface *altsetting; | |
133 | ||
134 | struct usb_host_interface *cur_altsetting; /* the currently | |
135 | * active alternate setting */ | |
136 | unsigned num_altsetting; /* number of alternate settings */ | |
137 | ||
138 | int minor; /* minor number this interface is bound to */ | |
139 | enum usb_interface_condition condition; /* state of binding */ | |
140 | struct device dev; /* interface specific device info */ | |
141 | struct class_device *class_dev; | |
142 | }; | |
143 | #define to_usb_interface(d) container_of(d, struct usb_interface, dev) | |
144 | #define interface_to_usbdev(intf) \ | |
145 | container_of(intf->dev.parent, struct usb_device, dev) | |
146 | ||
147 | static inline void *usb_get_intfdata (struct usb_interface *intf) | |
148 | { | |
149 | return dev_get_drvdata (&intf->dev); | |
150 | } | |
151 | ||
152 | static inline void usb_set_intfdata (struct usb_interface *intf, void *data) | |
153 | { | |
154 | dev_set_drvdata(&intf->dev, data); | |
155 | } | |
156 | ||
157 | struct usb_interface *usb_get_intf(struct usb_interface *intf); | |
158 | void usb_put_intf(struct usb_interface *intf); | |
159 | ||
160 | /* this maximum is arbitrary */ | |
161 | #define USB_MAXINTERFACES 32 | |
162 | ||
163 | /** | |
164 | * struct usb_interface_cache - long-term representation of a device interface | |
165 | * @num_altsetting: number of altsettings defined. | |
166 | * @ref: reference counter. | |
167 | * @altsetting: variable-length array of interface structures, one for | |
168 | * each alternate setting that may be selected. Each one includes a | |
169 | * set of endpoint configurations. They will be in no particular order. | |
170 | * | |
171 | * These structures persist for the lifetime of a usb_device, unlike | |
172 | * struct usb_interface (which persists only as long as its configuration | |
173 | * is installed). The altsetting arrays can be accessed through these | |
174 | * structures at any time, permitting comparison of configurations and | |
175 | * providing support for the /proc/bus/usb/devices pseudo-file. | |
176 | */ | |
177 | struct usb_interface_cache { | |
178 | unsigned num_altsetting; /* number of alternate settings */ | |
179 | struct kref ref; /* reference counter */ | |
180 | ||
181 | /* variable-length array of alternate settings for this interface, | |
182 | * stored in no particular order */ | |
183 | struct usb_host_interface altsetting[0]; | |
184 | }; | |
185 | #define ref_to_usb_interface_cache(r) \ | |
186 | container_of(r, struct usb_interface_cache, ref) | |
187 | #define altsetting_to_usb_interface_cache(a) \ | |
188 | container_of(a, struct usb_interface_cache, altsetting[0]) | |
189 | ||
190 | /** | |
191 | * struct usb_host_config - representation of a device's configuration | |
192 | * @desc: the device's configuration descriptor. | |
193 | * @string: pointer to the cached version of the iConfiguration string, if | |
194 | * present for this configuration. | |
195 | * @interface: array of pointers to usb_interface structures, one for each | |
196 | * interface in the configuration. The number of interfaces is stored | |
197 | * in desc.bNumInterfaces. These pointers are valid only while the | |
198 | * the configuration is active. | |
199 | * @intf_cache: array of pointers to usb_interface_cache structures, one | |
200 | * for each interface in the configuration. These structures exist | |
201 | * for the entire life of the device. | |
202 | * @extra: pointer to buffer containing all extra descriptors associated | |
203 | * with this configuration (those preceding the first interface | |
204 | * descriptor). | |
205 | * @extralen: length of the extra descriptors buffer. | |
206 | * | |
207 | * USB devices may have multiple configurations, but only one can be active | |
208 | * at any time. Each encapsulates a different operational environment; | |
209 | * for example, a dual-speed device would have separate configurations for | |
210 | * full-speed and high-speed operation. The number of configurations | |
211 | * available is stored in the device descriptor as bNumConfigurations. | |
212 | * | |
213 | * A configuration can contain multiple interfaces. Each corresponds to | |
214 | * a different function of the USB device, and all are available whenever | |
215 | * the configuration is active. The USB standard says that interfaces | |
216 | * are supposed to be numbered from 0 to desc.bNumInterfaces-1, but a lot | |
217 | * of devices get this wrong. In addition, the interface array is not | |
218 | * guaranteed to be sorted in numerical order. Use usb_ifnum_to_if() to | |
219 | * look up an interface entry based on its number. | |
220 | * | |
221 | * Device drivers should not attempt to activate configurations. The choice | |
222 | * of which configuration to install is a policy decision based on such | |
223 | * considerations as available power, functionality provided, and the user's | |
224 | * desires (expressed through hotplug scripts). However, drivers can call | |
225 | * usb_reset_configuration() to reinitialize the current configuration and | |
226 | * all its interfaces. | |
227 | */ | |
228 | struct usb_host_config { | |
229 | struct usb_config_descriptor desc; | |
230 | ||
231 | char *string; | |
232 | /* the interfaces associated with this configuration, | |
233 | * stored in no particular order */ | |
234 | struct usb_interface *interface[USB_MAXINTERFACES]; | |
235 | ||
236 | /* Interface information available even when this is not the | |
237 | * active configuration */ | |
238 | struct usb_interface_cache *intf_cache[USB_MAXINTERFACES]; | |
239 | ||
240 | unsigned char *extra; /* Extra descriptors */ | |
241 | int extralen; | |
242 | }; | |
243 | ||
244 | int __usb_get_extra_descriptor(char *buffer, unsigned size, | |
245 | unsigned char type, void **ptr); | |
246 | #define usb_get_extra_descriptor(ifpoint,type,ptr)\ | |
247 | __usb_get_extra_descriptor((ifpoint)->extra,(ifpoint)->extralen,\ | |
248 | type,(void**)ptr) | |
249 | ||
250 | /* -------------------------------------------------------------------------- */ | |
251 | ||
252 | struct usb_operations; | |
253 | ||
254 | /* USB device number allocation bitmap */ | |
255 | struct usb_devmap { | |
256 | unsigned long devicemap[128 / (8*sizeof(unsigned long))]; | |
257 | }; | |
258 | ||
259 | /* | |
260 | * Allocated per bus (tree of devices) we have: | |
261 | */ | |
262 | struct usb_bus { | |
263 | struct device *controller; /* host/master side hardware */ | |
264 | int busnum; /* Bus number (in order of reg) */ | |
265 | char *bus_name; /* stable id (PCI slot_name etc) */ | |
266 | u8 otg_port; /* 0, or number of OTG/HNP port */ | |
267 | unsigned is_b_host:1; /* true during some HNP roleswitches */ | |
268 | unsigned b_hnp_enable:1; /* OTG: did A-Host enable HNP? */ | |
269 | ||
270 | int devnum_next; /* Next open device number in round-robin allocation */ | |
271 | ||
272 | struct usb_devmap devmap; /* device address allocation map */ | |
273 | struct usb_operations *op; /* Operations (specific to the HC) */ | |
274 | struct usb_device *root_hub; /* Root hub */ | |
275 | struct list_head bus_list; /* list of busses */ | |
276 | void *hcpriv; /* Host Controller private data */ | |
277 | ||
278 | int bandwidth_allocated; /* on this bus: how much of the time | |
279 | * reserved for periodic (intr/iso) | |
280 | * requests is used, on average? | |
281 | * Units: microseconds/frame. | |
282 | * Limits: Full/low speed reserve 90%, | |
283 | * while high speed reserves 80%. | |
284 | */ | |
285 | int bandwidth_int_reqs; /* number of Interrupt requests */ | |
286 | int bandwidth_isoc_reqs; /* number of Isoc. requests */ | |
287 | ||
288 | struct dentry *usbfs_dentry; /* usbfs dentry entry for the bus */ | |
289 | ||
290 | struct class_device class_dev; /* class device for this bus */ | |
291 | void (*release)(struct usb_bus *bus); /* function to destroy this bus's memory */ | |
292 | #if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE) | |
293 | struct mon_bus *mon_bus; /* non-null when associated */ | |
294 | int monitored; /* non-zero when monitored */ | |
295 | #endif | |
296 | }; | |
297 | #define to_usb_bus(d) container_of(d, struct usb_bus, class_dev) | |
298 | ||
299 | ||
300 | /* -------------------------------------------------------------------------- */ | |
301 | ||
302 | /* This is arbitrary. | |
303 | * From USB 2.0 spec Table 11-13, offset 7, a hub can | |
304 | * have up to 255 ports. The most yet reported is 10. | |
305 | */ | |
306 | #define USB_MAXCHILDREN (16) | |
307 | ||
308 | struct usb_tt; | |
309 | ||
310 | /* | |
311 | * struct usb_device - kernel's representation of a USB device | |
312 | * | |
313 | * FIXME: Write the kerneldoc! | |
314 | * | |
315 | * Usbcore drivers should not set usbdev->state directly. Instead use | |
316 | * usb_set_device_state(). | |
317 | */ | |
318 | struct usb_device { | |
319 | int devnum; /* Address on USB bus */ | |
320 | char devpath [16]; /* Use in messages: /port/port/... */ | |
321 | enum usb_device_state state; /* configured, not attached, etc */ | |
322 | enum usb_device_speed speed; /* high/full/low (or error) */ | |
323 | ||
324 | struct usb_tt *tt; /* low/full speed dev, highspeed hub */ | |
325 | int ttport; /* device port on that tt hub */ | |
326 | ||
327 | struct semaphore serialize; | |
328 | ||
329 | unsigned int toggle[2]; /* one bit for each endpoint ([0] = IN, [1] = OUT) */ | |
330 | ||
331 | struct usb_device *parent; /* our hub, unless we're the root */ | |
332 | struct usb_bus *bus; /* Bus we're part of */ | |
333 | struct usb_host_endpoint ep0; | |
334 | ||
335 | struct device dev; /* Generic device interface */ | |
336 | ||
337 | struct usb_device_descriptor descriptor;/* Descriptor */ | |
338 | struct usb_host_config *config; /* All of the configs */ | |
339 | ||
340 | struct usb_host_config *actconfig;/* the active configuration */ | |
341 | struct usb_host_endpoint *ep_in[16]; | |
342 | struct usb_host_endpoint *ep_out[16]; | |
343 | ||
344 | char **rawdescriptors; /* Raw descriptors for each config */ | |
345 | ||
346 | int have_langid; /* whether string_langid is valid yet */ | |
347 | int string_langid; /* language ID for strings */ | |
348 | ||
349 | char *product; | |
350 | char *manufacturer; | |
351 | char *serial; /* static strings from the device */ | |
352 | struct list_head filelist; | |
353 | struct dentry *usbfs_dentry; /* usbfs dentry entry for the device */ | |
354 | ||
355 | /* | |
356 | * Child devices - these can be either new devices | |
357 | * (if this is a hub device), or different instances | |
358 | * of this same device. | |
359 | * | |
360 | * Each instance needs its own set of data structures. | |
361 | */ | |
362 | ||
363 | int maxchild; /* Number of ports if hub */ | |
364 | struct usb_device *children[USB_MAXCHILDREN]; | |
365 | }; | |
366 | #define to_usb_device(d) container_of(d, struct usb_device, dev) | |
367 | ||
368 | extern struct usb_device *usb_get_dev(struct usb_device *dev); | |
369 | extern void usb_put_dev(struct usb_device *dev); | |
370 | ||
371 | extern void usb_lock_device(struct usb_device *udev); | |
372 | extern int usb_trylock_device(struct usb_device *udev); | |
373 | extern int usb_lock_device_for_reset(struct usb_device *udev, | |
374 | struct usb_interface *iface); | |
375 | extern void usb_unlock_device(struct usb_device *udev); | |
376 | ||
377 | /* USB port reset for device reinitialization */ | |
378 | extern int usb_reset_device(struct usb_device *dev); | |
379 | ||
380 | extern struct usb_device *usb_find_device(u16 vendor_id, u16 product_id); | |
381 | ||
382 | /*-------------------------------------------------------------------------*/ | |
383 | ||
384 | /* for drivers using iso endpoints */ | |
385 | extern int usb_get_current_frame_number (struct usb_device *usb_dev); | |
386 | ||
387 | /* used these for multi-interface device registration */ | |
388 | extern int usb_driver_claim_interface(struct usb_driver *driver, | |
389 | struct usb_interface *iface, void* priv); | |
390 | ||
391 | /** | |
392 | * usb_interface_claimed - returns true iff an interface is claimed | |
393 | * @iface: the interface being checked | |
394 | * | |
395 | * Returns true (nonzero) iff the interface is claimed, else false (zero). | |
396 | * Callers must own the driver model's usb bus readlock. So driver | |
397 | * probe() entries don't need extra locking, but other call contexts | |
398 | * may need to explicitly claim that lock. | |
399 | * | |
400 | */ | |
401 | static inline int usb_interface_claimed(struct usb_interface *iface) { | |
402 | return (iface->dev.driver != NULL); | |
403 | } | |
404 | ||
405 | extern void usb_driver_release_interface(struct usb_driver *driver, | |
406 | struct usb_interface *iface); | |
407 | const struct usb_device_id *usb_match_id(struct usb_interface *interface, | |
408 | const struct usb_device_id *id); | |
409 | ||
410 | extern struct usb_interface *usb_find_interface(struct usb_driver *drv, | |
411 | int minor); | |
412 | extern struct usb_interface *usb_ifnum_to_if(struct usb_device *dev, | |
413 | unsigned ifnum); | |
414 | extern struct usb_host_interface *usb_altnum_to_altsetting( | |
415 | struct usb_interface *intf, unsigned int altnum); | |
416 | ||
417 | ||
418 | /** | |
419 | * usb_make_path - returns stable device path in the usb tree | |
420 | * @dev: the device whose path is being constructed | |
421 | * @buf: where to put the string | |
422 | * @size: how big is "buf"? | |
423 | * | |
424 | * Returns length of the string (> 0) or negative if size was too small. | |
425 | * | |
426 | * This identifier is intended to be "stable", reflecting physical paths in | |
427 | * hardware such as physical bus addresses for host controllers or ports on | |
428 | * USB hubs. That makes it stay the same until systems are physically | |
429 | * reconfigured, by re-cabling a tree of USB devices or by moving USB host | |
430 | * controllers. Adding and removing devices, including virtual root hubs | |
431 | * in host controller driver modules, does not change these path identifers; | |
432 | * neither does rebooting or re-enumerating. These are more useful identifiers | |
433 | * than changeable ("unstable") ones like bus numbers or device addresses. | |
434 | * | |
435 | * With a partial exception for devices connected to USB 2.0 root hubs, these | |
436 | * identifiers are also predictable. So long as the device tree isn't changed, | |
437 | * plugging any USB device into a given hub port always gives it the same path. | |
438 | * Because of the use of "companion" controllers, devices connected to ports on | |
439 | * USB 2.0 root hubs (EHCI host controllers) will get one path ID if they are | |
440 | * high speed, and a different one if they are full or low speed. | |
441 | */ | |
442 | static inline int usb_make_path (struct usb_device *dev, char *buf, size_t size) | |
443 | { | |
444 | int actual; | |
445 | actual = snprintf (buf, size, "usb-%s-%s", dev->bus->bus_name, dev->devpath); | |
446 | return (actual >= (int)size) ? -1 : actual; | |
447 | } | |
448 | ||
449 | /*-------------------------------------------------------------------------*/ | |
450 | ||
451 | #define USB_DEVICE_ID_MATCH_DEVICE (USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT) | |
452 | #define USB_DEVICE_ID_MATCH_DEV_RANGE (USB_DEVICE_ID_MATCH_DEV_LO | USB_DEVICE_ID_MATCH_DEV_HI) | |
453 | #define USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION (USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_DEV_RANGE) | |
454 | #define USB_DEVICE_ID_MATCH_DEV_INFO \ | |
455 | (USB_DEVICE_ID_MATCH_DEV_CLASS | USB_DEVICE_ID_MATCH_DEV_SUBCLASS | USB_DEVICE_ID_MATCH_DEV_PROTOCOL) | |
456 | #define USB_DEVICE_ID_MATCH_INT_INFO \ | |
457 | (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS | USB_DEVICE_ID_MATCH_INT_PROTOCOL) | |
458 | ||
459 | /** | |
460 | * USB_DEVICE - macro used to describe a specific usb device | |
461 | * @vend: the 16 bit USB Vendor ID | |
462 | * @prod: the 16 bit USB Product ID | |
463 | * | |
464 | * This macro is used to create a struct usb_device_id that matches a | |
465 | * specific device. | |
466 | */ | |
467 | #define USB_DEVICE(vend,prod) \ | |
468 | .match_flags = USB_DEVICE_ID_MATCH_DEVICE, .idVendor = (vend), .idProduct = (prod) | |
469 | /** | |
470 | * USB_DEVICE_VER - macro used to describe a specific usb device with a version range | |
471 | * @vend: the 16 bit USB Vendor ID | |
472 | * @prod: the 16 bit USB Product ID | |
473 | * @lo: the bcdDevice_lo value | |
474 | * @hi: the bcdDevice_hi value | |
475 | * | |
476 | * This macro is used to create a struct usb_device_id that matches a | |
477 | * specific device, with a version range. | |
478 | */ | |
479 | #define USB_DEVICE_VER(vend,prod,lo,hi) \ | |
480 | .match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION, .idVendor = (vend), .idProduct = (prod), .bcdDevice_lo = (lo), .bcdDevice_hi = (hi) | |
481 | ||
482 | /** | |
483 | * USB_DEVICE_INFO - macro used to describe a class of usb devices | |
484 | * @cl: bDeviceClass value | |
485 | * @sc: bDeviceSubClass value | |
486 | * @pr: bDeviceProtocol value | |
487 | * | |
488 | * This macro is used to create a struct usb_device_id that matches a | |
489 | * specific class of devices. | |
490 | */ | |
491 | #define USB_DEVICE_INFO(cl,sc,pr) \ | |
492 | .match_flags = USB_DEVICE_ID_MATCH_DEV_INFO, .bDeviceClass = (cl), .bDeviceSubClass = (sc), .bDeviceProtocol = (pr) | |
493 | ||
494 | /** | |
495 | * USB_INTERFACE_INFO - macro used to describe a class of usb interfaces | |
496 | * @cl: bInterfaceClass value | |
497 | * @sc: bInterfaceSubClass value | |
498 | * @pr: bInterfaceProtocol value | |
499 | * | |
500 | * This macro is used to create a struct usb_device_id that matches a | |
501 | * specific class of interfaces. | |
502 | */ | |
503 | #define USB_INTERFACE_INFO(cl,sc,pr) \ | |
504 | .match_flags = USB_DEVICE_ID_MATCH_INT_INFO, .bInterfaceClass = (cl), .bInterfaceSubClass = (sc), .bInterfaceProtocol = (pr) | |
505 | ||
506 | /* -------------------------------------------------------------------------- */ | |
507 | ||
508 | /** | |
509 | * struct usb_driver - identifies USB driver to usbcore | |
510 | * @owner: Pointer to the module owner of this driver; initialize | |
511 | * it using THIS_MODULE. | |
512 | * @name: The driver name should be unique among USB drivers, | |
513 | * and should normally be the same as the module name. | |
514 | * @probe: Called to see if the driver is willing to manage a particular | |
515 | * interface on a device. If it is, probe returns zero and uses | |
516 | * dev_set_drvdata() to associate driver-specific data with the | |
517 | * interface. It may also use usb_set_interface() to specify the | |
518 | * appropriate altsetting. If unwilling to manage the interface, | |
519 | * return a negative errno value. | |
520 | * @disconnect: Called when the interface is no longer accessible, usually | |
521 | * because its device has been (or is being) disconnected or the | |
522 | * driver module is being unloaded. | |
523 | * @ioctl: Used for drivers that want to talk to userspace through | |
524 | * the "usbfs" filesystem. This lets devices provide ways to | |
525 | * expose information to user space regardless of where they | |
526 | * do (or don't) show up otherwise in the filesystem. | |
527 | * @suspend: Called when the device is going to be suspended by the system. | |
528 | * @resume: Called when the device is being resumed by the system. | |
529 | * @id_table: USB drivers use ID table to support hotplugging. | |
530 | * Export this with MODULE_DEVICE_TABLE(usb,...). This must be set | |
531 | * or your driver's probe function will never get called. | |
532 | * @driver: the driver model core driver structure. | |
533 | * | |
534 | * USB drivers must provide a name, probe() and disconnect() methods, | |
535 | * and an id_table. Other driver fields are optional. | |
536 | * | |
537 | * The id_table is used in hotplugging. It holds a set of descriptors, | |
538 | * and specialized data may be associated with each entry. That table | |
539 | * is used by both user and kernel mode hotplugging support. | |
540 | * | |
541 | * The probe() and disconnect() methods are called in a context where | |
542 | * they can sleep, but they should avoid abusing the privilege. Most | |
543 | * work to connect to a device should be done when the device is opened, | |
544 | * and undone at the last close. The disconnect code needs to address | |
545 | * concurrency issues with respect to open() and close() methods, as | |
546 | * well as forcing all pending I/O requests to complete (by unlinking | |
547 | * them as necessary, and blocking until the unlinks complete). | |
548 | */ | |
549 | struct usb_driver { | |
550 | struct module *owner; | |
551 | ||
552 | const char *name; | |
553 | ||
554 | int (*probe) (struct usb_interface *intf, | |
555 | const struct usb_device_id *id); | |
556 | ||
557 | void (*disconnect) (struct usb_interface *intf); | |
558 | ||
559 | int (*ioctl) (struct usb_interface *intf, unsigned int code, void *buf); | |
560 | ||
27d72e85 | 561 | int (*suspend) (struct usb_interface *intf, pm_message_t message); |
1da177e4 LT |
562 | int (*resume) (struct usb_interface *intf); |
563 | ||
564 | const struct usb_device_id *id_table; | |
565 | ||
566 | struct device_driver driver; | |
567 | }; | |
568 | #define to_usb_driver(d) container_of(d, struct usb_driver, driver) | |
569 | ||
570 | extern struct bus_type usb_bus_type; | |
571 | ||
572 | /** | |
573 | * struct usb_class_driver - identifies a USB driver that wants to use the USB major number | |
574 | * @name: devfs name for this driver. Will also be used by the driver | |
575 | * class code to create a usb class device. | |
576 | * @fops: pointer to the struct file_operations of this driver. | |
577 | * @mode: the mode for the devfs file to be created for this driver. | |
578 | * @minor_base: the start of the minor range for this driver. | |
579 | * | |
580 | * This structure is used for the usb_register_dev() and | |
581 | * usb_unregister_dev() functions, to consolidate a number of the | |
582 | * parameters used for them. | |
583 | */ | |
584 | struct usb_class_driver { | |
585 | char *name; | |
586 | struct file_operations *fops; | |
587 | mode_t mode; | |
588 | int minor_base; | |
589 | }; | |
590 | ||
591 | /* | |
592 | * use these in module_init()/module_exit() | |
593 | * and don't forget MODULE_DEVICE_TABLE(usb, ...) | |
594 | */ | |
595 | extern int usb_register(struct usb_driver *); | |
596 | extern void usb_deregister(struct usb_driver *); | |
597 | ||
598 | extern int usb_register_dev(struct usb_interface *intf, | |
599 | struct usb_class_driver *class_driver); | |
600 | extern void usb_deregister_dev(struct usb_interface *intf, | |
601 | struct usb_class_driver *class_driver); | |
602 | ||
603 | extern int usb_disabled(void); | |
604 | ||
605 | /* -------------------------------------------------------------------------- */ | |
606 | ||
607 | /* | |
608 | * URB support, for asynchronous request completions | |
609 | */ | |
610 | ||
611 | /* | |
612 | * urb->transfer_flags: | |
613 | */ | |
614 | #define URB_SHORT_NOT_OK 0x0001 /* report short reads as errors */ | |
615 | #define URB_ISO_ASAP 0x0002 /* iso-only, urb->start_frame ignored */ | |
616 | #define URB_NO_TRANSFER_DMA_MAP 0x0004 /* urb->transfer_dma valid on submit */ | |
617 | #define URB_NO_SETUP_DMA_MAP 0x0008 /* urb->setup_dma valid on submit */ | |
618 | #define URB_ASYNC_UNLINK 0x0010 /* usb_unlink_urb() returns asap */ | |
619 | #define URB_NO_FSBR 0x0020 /* UHCI-specific */ | |
620 | #define URB_ZERO_PACKET 0x0040 /* Finish bulk OUTs with short packet */ | |
621 | #define URB_NO_INTERRUPT 0x0080 /* HINT: no non-error interrupt needed */ | |
622 | ||
623 | struct usb_iso_packet_descriptor { | |
624 | unsigned int offset; | |
625 | unsigned int length; /* expected length */ | |
626 | unsigned int actual_length; | |
627 | unsigned int status; | |
628 | }; | |
629 | ||
630 | struct urb; | |
631 | struct pt_regs; | |
632 | ||
633 | typedef void (*usb_complete_t)(struct urb *, struct pt_regs *); | |
634 | ||
635 | /** | |
636 | * struct urb - USB Request Block | |
637 | * @urb_list: For use by current owner of the URB. | |
638 | * @pipe: Holds endpoint number, direction, type, and more. | |
639 | * Create these values with the eight macros available; | |
640 | * usb_{snd,rcv}TYPEpipe(dev,endpoint), where the TYPE is "ctrl" | |
641 | * (control), "bulk", "int" (interrupt), or "iso" (isochronous). | |
642 | * For example usb_sndbulkpipe() or usb_rcvintpipe(). Endpoint | |
643 | * numbers range from zero to fifteen. Note that "in" endpoint two | |
644 | * is a different endpoint (and pipe) from "out" endpoint two. | |
645 | * The current configuration controls the existence, type, and | |
646 | * maximum packet size of any given endpoint. | |
647 | * @dev: Identifies the USB device to perform the request. | |
648 | * @status: This is read in non-iso completion functions to get the | |
649 | * status of the particular request. ISO requests only use it | |
650 | * to tell whether the URB was unlinked; detailed status for | |
651 | * each frame is in the fields of the iso_frame-desc. | |
652 | * @transfer_flags: A variety of flags may be used to affect how URB | |
653 | * submission, unlinking, or operation are handled. Different | |
654 | * kinds of URB can use different flags. | |
655 | * @transfer_buffer: This identifies the buffer to (or from) which | |
656 | * the I/O request will be performed (unless URB_NO_TRANSFER_DMA_MAP | |
657 | * is set). This buffer must be suitable for DMA; allocate it with | |
658 | * kmalloc() or equivalent. For transfers to "in" endpoints, contents | |
659 | * of this buffer will be modified. This buffer is used for the data | |
660 | * stage of control transfers. | |
661 | * @transfer_dma: When transfer_flags includes URB_NO_TRANSFER_DMA_MAP, | |
662 | * the device driver is saying that it provided this DMA address, | |
663 | * which the host controller driver should use in preference to the | |
664 | * transfer_buffer. | |
665 | * @transfer_buffer_length: How big is transfer_buffer. The transfer may | |
666 | * be broken up into chunks according to the current maximum packet | |
667 | * size for the endpoint, which is a function of the configuration | |
668 | * and is encoded in the pipe. When the length is zero, neither | |
669 | * transfer_buffer nor transfer_dma is used. | |
670 | * @actual_length: This is read in non-iso completion functions, and | |
671 | * it tells how many bytes (out of transfer_buffer_length) were | |
672 | * transferred. It will normally be the same as requested, unless | |
673 | * either an error was reported or a short read was performed. | |
674 | * The URB_SHORT_NOT_OK transfer flag may be used to make such | |
675 | * short reads be reported as errors. | |
676 | * @setup_packet: Only used for control transfers, this points to eight bytes | |
677 | * of setup data. Control transfers always start by sending this data | |
678 | * to the device. Then transfer_buffer is read or written, if needed. | |
679 | * @setup_dma: For control transfers with URB_NO_SETUP_DMA_MAP set, the | |
680 | * device driver has provided this DMA address for the setup packet. | |
681 | * The host controller driver should use this in preference to | |
682 | * setup_packet. | |
683 | * @start_frame: Returns the initial frame for isochronous transfers. | |
684 | * @number_of_packets: Lists the number of ISO transfer buffers. | |
685 | * @interval: Specifies the polling interval for interrupt or isochronous | |
686 | * transfers. The units are frames (milliseconds) for for full and low | |
687 | * speed devices, and microframes (1/8 millisecond) for highspeed ones. | |
688 | * @error_count: Returns the number of ISO transfers that reported errors. | |
689 | * @context: For use in completion functions. This normally points to | |
690 | * request-specific driver context. | |
691 | * @complete: Completion handler. This URB is passed as the parameter to the | |
692 | * completion function. The completion function may then do what | |
693 | * it likes with the URB, including resubmitting or freeing it. | |
694 | * @iso_frame_desc: Used to provide arrays of ISO transfer buffers and to | |
695 | * collect the transfer status for each buffer. | |
696 | * | |
697 | * This structure identifies USB transfer requests. URBs must be allocated by | |
698 | * calling usb_alloc_urb() and freed with a call to usb_free_urb(). | |
699 | * Initialization may be done using various usb_fill_*_urb() functions. URBs | |
700 | * are submitted using usb_submit_urb(), and pending requests may be canceled | |
701 | * using usb_unlink_urb() or usb_kill_urb(). | |
702 | * | |
703 | * Data Transfer Buffers: | |
704 | * | |
705 | * Normally drivers provide I/O buffers allocated with kmalloc() or otherwise | |
706 | * taken from the general page pool. That is provided by transfer_buffer | |
707 | * (control requests also use setup_packet), and host controller drivers | |
708 | * perform a dma mapping (and unmapping) for each buffer transferred. Those | |
709 | * mapping operations can be expensive on some platforms (perhaps using a dma | |
710 | * bounce buffer or talking to an IOMMU), | |
711 | * although they're cheap on commodity x86 and ppc hardware. | |
712 | * | |
713 | * Alternatively, drivers may pass the URB_NO_xxx_DMA_MAP transfer flags, | |
714 | * which tell the host controller driver that no such mapping is needed since | |
715 | * the device driver is DMA-aware. For example, a device driver might | |
716 | * allocate a DMA buffer with usb_buffer_alloc() or call usb_buffer_map(). | |
717 | * When these transfer flags are provided, host controller drivers will | |
718 | * attempt to use the dma addresses found in the transfer_dma and/or | |
719 | * setup_dma fields rather than determining a dma address themselves. (Note | |
720 | * that transfer_buffer and setup_packet must still be set because not all | |
721 | * host controllers use DMA, nor do virtual root hubs). | |
722 | * | |
723 | * Initialization: | |
724 | * | |
725 | * All URBs submitted must initialize the dev, pipe, transfer_flags (may be | |
726 | * zero), and complete fields. | |
727 | * The URB_ASYNC_UNLINK transfer flag affects later invocations of | |
728 | * the usb_unlink_urb() routine. Note: Failure to set URB_ASYNC_UNLINK | |
729 | * with usb_unlink_urb() is deprecated. For synchronous unlinks use | |
730 | * usb_kill_urb() instead. | |
731 | * | |
732 | * All URBs must also initialize | |
733 | * transfer_buffer and transfer_buffer_length. They may provide the | |
734 | * URB_SHORT_NOT_OK transfer flag, indicating that short reads are | |
735 | * to be treated as errors; that flag is invalid for write requests. | |
736 | * | |
737 | * Bulk URBs may | |
738 | * use the URB_ZERO_PACKET transfer flag, indicating that bulk OUT transfers | |
739 | * should always terminate with a short packet, even if it means adding an | |
740 | * extra zero length packet. | |
741 | * | |
742 | * Control URBs must provide a setup_packet. The setup_packet and | |
743 | * transfer_buffer may each be mapped for DMA or not, independently of | |
744 | * the other. The transfer_flags bits URB_NO_TRANSFER_DMA_MAP and | |
745 | * URB_NO_SETUP_DMA_MAP indicate which buffers have already been mapped. | |
746 | * URB_NO_SETUP_DMA_MAP is ignored for non-control URBs. | |
747 | * | |
748 | * Interrupt URBs must provide an interval, saying how often (in milliseconds | |
749 | * or, for highspeed devices, 125 microsecond units) | |
750 | * to poll for transfers. After the URB has been submitted, the interval | |
751 | * field reflects how the transfer was actually scheduled. | |
752 | * The polling interval may be more frequent than requested. | |
753 | * For example, some controllers have a maximum interval of 32 milliseconds, | |
754 | * while others support intervals of up to 1024 milliseconds. | |
755 | * Isochronous URBs also have transfer intervals. (Note that for isochronous | |
756 | * endpoints, as well as high speed interrupt endpoints, the encoding of | |
757 | * the transfer interval in the endpoint descriptor is logarithmic. | |
758 | * Device drivers must convert that value to linear units themselves.) | |
759 | * | |
760 | * Isochronous URBs normally use the URB_ISO_ASAP transfer flag, telling | |
761 | * the host controller to schedule the transfer as soon as bandwidth | |
762 | * utilization allows, and then set start_frame to reflect the actual frame | |
763 | * selected during submission. Otherwise drivers must specify the start_frame | |
764 | * and handle the case where the transfer can't begin then. However, drivers | |
765 | * won't know how bandwidth is currently allocated, and while they can | |
766 | * find the current frame using usb_get_current_frame_number () they can't | |
767 | * know the range for that frame number. (Ranges for frame counter values | |
768 | * are HC-specific, and can go from 256 to 65536 frames from "now".) | |
769 | * | |
770 | * Isochronous URBs have a different data transfer model, in part because | |
771 | * the quality of service is only "best effort". Callers provide specially | |
772 | * allocated URBs, with number_of_packets worth of iso_frame_desc structures | |
773 | * at the end. Each such packet is an individual ISO transfer. Isochronous | |
774 | * URBs are normally queued, submitted by drivers to arrange that | |
775 | * transfers are at least double buffered, and then explicitly resubmitted | |
776 | * in completion handlers, so | |
777 | * that data (such as audio or video) streams at as constant a rate as the | |
778 | * host controller scheduler can support. | |
779 | * | |
780 | * Completion Callbacks: | |
781 | * | |
782 | * The completion callback is made in_interrupt(), and one of the first | |
783 | * things that a completion handler should do is check the status field. | |
784 | * The status field is provided for all URBs. It is used to report | |
785 | * unlinked URBs, and status for all non-ISO transfers. It should not | |
786 | * be examined before the URB is returned to the completion handler. | |
787 | * | |
788 | * The context field is normally used to link URBs back to the relevant | |
789 | * driver or request state. | |
790 | * | |
791 | * When the completion callback is invoked for non-isochronous URBs, the | |
792 | * actual_length field tells how many bytes were transferred. This field | |
793 | * is updated even when the URB terminated with an error or was unlinked. | |
794 | * | |
795 | * ISO transfer status is reported in the status and actual_length fields | |
796 | * of the iso_frame_desc array, and the number of errors is reported in | |
797 | * error_count. Completion callbacks for ISO transfers will normally | |
798 | * (re)submit URBs to ensure a constant transfer rate. | |
799 | */ | |
800 | struct urb | |
801 | { | |
802 | /* private, usb core and host controller only fields in the urb */ | |
803 | struct kref kref; /* reference count of the URB */ | |
804 | spinlock_t lock; /* lock for the URB */ | |
805 | void *hcpriv; /* private data for host controller */ | |
806 | struct list_head urb_list; /* list pointer to all active urbs */ | |
807 | int bandwidth; /* bandwidth for INT/ISO request */ | |
808 | atomic_t use_count; /* concurrent submissions counter */ | |
809 | u8 reject; /* submissions will fail */ | |
810 | ||
811 | /* public, documented fields in the urb that can be used by drivers */ | |
812 | struct usb_device *dev; /* (in) pointer to associated device */ | |
813 | unsigned int pipe; /* (in) pipe information */ | |
814 | int status; /* (return) non-ISO status */ | |
815 | unsigned int transfer_flags; /* (in) URB_SHORT_NOT_OK | ...*/ | |
816 | void *transfer_buffer; /* (in) associated data buffer */ | |
817 | dma_addr_t transfer_dma; /* (in) dma addr for transfer_buffer */ | |
818 | int transfer_buffer_length; /* (in) data buffer length */ | |
819 | int actual_length; /* (return) actual transfer length */ | |
820 | unsigned char *setup_packet; /* (in) setup packet (control only) */ | |
821 | dma_addr_t setup_dma; /* (in) dma addr for setup_packet */ | |
822 | int start_frame; /* (modify) start frame (ISO) */ | |
823 | int number_of_packets; /* (in) number of ISO packets */ | |
824 | int interval; /* (modify) transfer interval (INT/ISO) */ | |
825 | int error_count; /* (return) number of ISO errors */ | |
826 | void *context; /* (in) context for completion */ | |
827 | usb_complete_t complete; /* (in) completion routine */ | |
828 | struct usb_iso_packet_descriptor iso_frame_desc[0]; /* (in) ISO ONLY */ | |
829 | }; | |
830 | ||
831 | /* -------------------------------------------------------------------------- */ | |
832 | ||
833 | /** | |
834 | * usb_fill_control_urb - initializes a control urb | |
835 | * @urb: pointer to the urb to initialize. | |
836 | * @dev: pointer to the struct usb_device for this urb. | |
837 | * @pipe: the endpoint pipe | |
838 | * @setup_packet: pointer to the setup_packet buffer | |
839 | * @transfer_buffer: pointer to the transfer buffer | |
840 | * @buffer_length: length of the transfer buffer | |
841 | * @complete: pointer to the usb_complete_t function | |
842 | * @context: what to set the urb context to. | |
843 | * | |
844 | * Initializes a control urb with the proper information needed to submit | |
845 | * it to a device. | |
846 | */ | |
847 | static inline void usb_fill_control_urb (struct urb *urb, | |
848 | struct usb_device *dev, | |
849 | unsigned int pipe, | |
850 | unsigned char *setup_packet, | |
851 | void *transfer_buffer, | |
852 | int buffer_length, | |
853 | usb_complete_t complete, | |
854 | void *context) | |
855 | { | |
856 | spin_lock_init(&urb->lock); | |
857 | urb->dev = dev; | |
858 | urb->pipe = pipe; | |
859 | urb->setup_packet = setup_packet; | |
860 | urb->transfer_buffer = transfer_buffer; | |
861 | urb->transfer_buffer_length = buffer_length; | |
862 | urb->complete = complete; | |
863 | urb->context = context; | |
864 | } | |
865 | ||
866 | /** | |
867 | * usb_fill_bulk_urb - macro to help initialize a bulk urb | |
868 | * @urb: pointer to the urb to initialize. | |
869 | * @dev: pointer to the struct usb_device for this urb. | |
870 | * @pipe: the endpoint pipe | |
871 | * @transfer_buffer: pointer to the transfer buffer | |
872 | * @buffer_length: length of the transfer buffer | |
873 | * @complete: pointer to the usb_complete_t function | |
874 | * @context: what to set the urb context to. | |
875 | * | |
876 | * Initializes a bulk urb with the proper information needed to submit it | |
877 | * to a device. | |
878 | */ | |
879 | static inline void usb_fill_bulk_urb (struct urb *urb, | |
880 | struct usb_device *dev, | |
881 | unsigned int pipe, | |
882 | void *transfer_buffer, | |
883 | int buffer_length, | |
884 | usb_complete_t complete, | |
885 | void *context) | |
886 | { | |
887 | spin_lock_init(&urb->lock); | |
888 | urb->dev = dev; | |
889 | urb->pipe = pipe; | |
890 | urb->transfer_buffer = transfer_buffer; | |
891 | urb->transfer_buffer_length = buffer_length; | |
892 | urb->complete = complete; | |
893 | urb->context = context; | |
894 | } | |
895 | ||
896 | /** | |
897 | * usb_fill_int_urb - macro to help initialize a interrupt urb | |
898 | * @urb: pointer to the urb to initialize. | |
899 | * @dev: pointer to the struct usb_device for this urb. | |
900 | * @pipe: the endpoint pipe | |
901 | * @transfer_buffer: pointer to the transfer buffer | |
902 | * @buffer_length: length of the transfer buffer | |
903 | * @complete: pointer to the usb_complete_t function | |
904 | * @context: what to set the urb context to. | |
905 | * @interval: what to set the urb interval to, encoded like | |
906 | * the endpoint descriptor's bInterval value. | |
907 | * | |
908 | * Initializes a interrupt urb with the proper information needed to submit | |
909 | * it to a device. | |
910 | * Note that high speed interrupt endpoints use a logarithmic encoding of | |
911 | * the endpoint interval, and express polling intervals in microframes | |
912 | * (eight per millisecond) rather than in frames (one per millisecond). | |
913 | */ | |
914 | static inline void usb_fill_int_urb (struct urb *urb, | |
915 | struct usb_device *dev, | |
916 | unsigned int pipe, | |
917 | void *transfer_buffer, | |
918 | int buffer_length, | |
919 | usb_complete_t complete, | |
920 | void *context, | |
921 | int interval) | |
922 | { | |
923 | spin_lock_init(&urb->lock); | |
924 | urb->dev = dev; | |
925 | urb->pipe = pipe; | |
926 | urb->transfer_buffer = transfer_buffer; | |
927 | urb->transfer_buffer_length = buffer_length; | |
928 | urb->complete = complete; | |
929 | urb->context = context; | |
930 | if (dev->speed == USB_SPEED_HIGH) | |
931 | urb->interval = 1 << (interval - 1); | |
932 | else | |
933 | urb->interval = interval; | |
934 | urb->start_frame = -1; | |
935 | } | |
936 | ||
937 | extern void usb_init_urb(struct urb *urb); | |
938 | extern struct urb *usb_alloc_urb(int iso_packets, int mem_flags); | |
939 | extern void usb_free_urb(struct urb *urb); | |
940 | #define usb_put_urb usb_free_urb | |
941 | extern struct urb *usb_get_urb(struct urb *urb); | |
942 | extern int usb_submit_urb(struct urb *urb, int mem_flags); | |
943 | extern int usb_unlink_urb(struct urb *urb); | |
944 | extern void usb_kill_urb(struct urb *urb); | |
945 | ||
946 | #define HAVE_USB_BUFFERS | |
947 | void *usb_buffer_alloc (struct usb_device *dev, size_t size, | |
948 | int mem_flags, dma_addr_t *dma); | |
949 | void usb_buffer_free (struct usb_device *dev, size_t size, | |
950 | void *addr, dma_addr_t dma); | |
951 | ||
952 | #if 0 | |
953 | struct urb *usb_buffer_map (struct urb *urb); | |
954 | void usb_buffer_dmasync (struct urb *urb); | |
955 | void usb_buffer_unmap (struct urb *urb); | |
956 | #endif | |
957 | ||
958 | struct scatterlist; | |
959 | int usb_buffer_map_sg (struct usb_device *dev, unsigned pipe, | |
960 | struct scatterlist *sg, int nents); | |
961 | #if 0 | |
962 | void usb_buffer_dmasync_sg (struct usb_device *dev, unsigned pipe, | |
963 | struct scatterlist *sg, int n_hw_ents); | |
964 | #endif | |
965 | void usb_buffer_unmap_sg (struct usb_device *dev, unsigned pipe, | |
966 | struct scatterlist *sg, int n_hw_ents); | |
967 | ||
968 | /*-------------------------------------------------------------------* | |
969 | * SYNCHRONOUS CALL SUPPORT * | |
970 | *-------------------------------------------------------------------*/ | |
971 | ||
972 | extern int usb_control_msg(struct usb_device *dev, unsigned int pipe, | |
973 | __u8 request, __u8 requesttype, __u16 value, __u16 index, | |
974 | void *data, __u16 size, int timeout); | |
975 | extern int usb_bulk_msg(struct usb_device *usb_dev, unsigned int pipe, | |
976 | void *data, int len, int *actual_length, | |
977 | int timeout); | |
978 | ||
979 | /* selective suspend/resume */ | |
27d72e85 | 980 | extern int usb_suspend_device(struct usb_device *dev, pm_message_t message); |
1da177e4 LT |
981 | extern int usb_resume_device(struct usb_device *dev); |
982 | ||
983 | ||
984 | /* wrappers around usb_control_msg() for the most common standard requests */ | |
985 | extern int usb_get_descriptor(struct usb_device *dev, unsigned char desctype, | |
986 | unsigned char descindex, void *buf, int size); | |
987 | extern int usb_get_status(struct usb_device *dev, | |
988 | int type, int target, void *data); | |
989 | extern int usb_get_string(struct usb_device *dev, | |
990 | unsigned short langid, unsigned char index, void *buf, int size); | |
991 | extern int usb_string(struct usb_device *dev, int index, | |
992 | char *buf, size_t size); | |
993 | ||
994 | /* wrappers that also update important state inside usbcore */ | |
995 | extern int usb_clear_halt(struct usb_device *dev, int pipe); | |
996 | extern int usb_reset_configuration(struct usb_device *dev); | |
997 | extern int usb_set_interface(struct usb_device *dev, int ifnum, int alternate); | |
998 | ||
999 | /* | |
1000 | * timeouts, in milliseconds, used for sending/receiving control messages | |
1001 | * they typically complete within a few frames (msec) after they're issued | |
1002 | * USB identifies 5 second timeouts, maybe more in a few cases, and a few | |
1003 | * slow devices (like some MGE Ellipse UPSes) actually push that limit. | |
1004 | */ | |
1005 | #define USB_CTRL_GET_TIMEOUT 5000 | |
1006 | #define USB_CTRL_SET_TIMEOUT 5000 | |
1007 | ||
1008 | ||
1009 | /** | |
1010 | * struct usb_sg_request - support for scatter/gather I/O | |
1011 | * @status: zero indicates success, else negative errno | |
1012 | * @bytes: counts bytes transferred. | |
1013 | * | |
1014 | * These requests are initialized using usb_sg_init(), and then are used | |
1015 | * as request handles passed to usb_sg_wait() or usb_sg_cancel(). Most | |
1016 | * members of the request object aren't for driver access. | |
1017 | * | |
1018 | * The status and bytecount values are valid only after usb_sg_wait() | |
1019 | * returns. If the status is zero, then the bytecount matches the total | |
1020 | * from the request. | |
1021 | * | |
1022 | * After an error completion, drivers may need to clear a halt condition | |
1023 | * on the endpoint. | |
1024 | */ | |
1025 | struct usb_sg_request { | |
1026 | int status; | |
1027 | size_t bytes; | |
1028 | ||
1029 | /* | |
1030 | * members below are private to usbcore, | |
1031 | * and are not provided for driver access! | |
1032 | */ | |
1033 | spinlock_t lock; | |
1034 | ||
1035 | struct usb_device *dev; | |
1036 | int pipe; | |
1037 | struct scatterlist *sg; | |
1038 | int nents; | |
1039 | ||
1040 | int entries; | |
1041 | struct urb **urbs; | |
1042 | ||
1043 | int count; | |
1044 | struct completion complete; | |
1045 | }; | |
1046 | ||
1047 | int usb_sg_init ( | |
1048 | struct usb_sg_request *io, | |
1049 | struct usb_device *dev, | |
1050 | unsigned pipe, | |
1051 | unsigned period, | |
1052 | struct scatterlist *sg, | |
1053 | int nents, | |
1054 | size_t length, | |
1055 | int mem_flags | |
1056 | ); | |
1057 | void usb_sg_cancel (struct usb_sg_request *io); | |
1058 | void usb_sg_wait (struct usb_sg_request *io); | |
1059 | ||
1060 | ||
1061 | /* -------------------------------------------------------------------------- */ | |
1062 | ||
1063 | /* | |
1064 | * For various legacy reasons, Linux has a small cookie that's paired with | |
1065 | * a struct usb_device to identify an endpoint queue. Queue characteristics | |
1066 | * are defined by the endpoint's descriptor. This cookie is called a "pipe", | |
1067 | * an unsigned int encoded as: | |
1068 | * | |
1069 | * - direction: bit 7 (0 = Host-to-Device [Out], | |
1070 | * 1 = Device-to-Host [In] ... | |
1071 | * like endpoint bEndpointAddress) | |
1072 | * - device address: bits 8-14 ... bit positions known to uhci-hcd | |
1073 | * - endpoint: bits 15-18 ... bit positions known to uhci-hcd | |
1074 | * - pipe type: bits 30-31 (00 = isochronous, 01 = interrupt, | |
1075 | * 10 = control, 11 = bulk) | |
1076 | * | |
1077 | * Given the device address and endpoint descriptor, pipes are redundant. | |
1078 | */ | |
1079 | ||
1080 | /* NOTE: these are not the standard USB_ENDPOINT_XFER_* values!! */ | |
1081 | /* (yet ... they're the values used by usbfs) */ | |
1082 | #define PIPE_ISOCHRONOUS 0 | |
1083 | #define PIPE_INTERRUPT 1 | |
1084 | #define PIPE_CONTROL 2 | |
1085 | #define PIPE_BULK 3 | |
1086 | ||
1087 | #define usb_pipein(pipe) ((pipe) & USB_DIR_IN) | |
1088 | #define usb_pipeout(pipe) (!usb_pipein(pipe)) | |
1089 | ||
1090 | #define usb_pipedevice(pipe) (((pipe) >> 8) & 0x7f) | |
1091 | #define usb_pipeendpoint(pipe) (((pipe) >> 15) & 0xf) | |
1092 | ||
1093 | #define usb_pipetype(pipe) (((pipe) >> 30) & 3) | |
1094 | #define usb_pipeisoc(pipe) (usb_pipetype((pipe)) == PIPE_ISOCHRONOUS) | |
1095 | #define usb_pipeint(pipe) (usb_pipetype((pipe)) == PIPE_INTERRUPT) | |
1096 | #define usb_pipecontrol(pipe) (usb_pipetype((pipe)) == PIPE_CONTROL) | |
1097 | #define usb_pipebulk(pipe) (usb_pipetype((pipe)) == PIPE_BULK) | |
1098 | ||
1099 | /* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */ | |
1100 | #define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> (ep)) & 1) | |
1101 | #define usb_dotoggle(dev, ep, out) ((dev)->toggle[out] ^= (1 << (ep))) | |
1102 | #define usb_settoggle(dev, ep, out, bit) ((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << (ep))) | ((bit) << (ep))) | |
1103 | ||
1104 | ||
1105 | static inline unsigned int __create_pipe(struct usb_device *dev, unsigned int endpoint) | |
1106 | { | |
1107 | return (dev->devnum << 8) | (endpoint << 15); | |
1108 | } | |
1109 | ||
1110 | /* Create various pipes... */ | |
1111 | #define usb_sndctrlpipe(dev,endpoint) ((PIPE_CONTROL << 30) | __create_pipe(dev,endpoint)) | |
1112 | #define usb_rcvctrlpipe(dev,endpoint) ((PIPE_CONTROL << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN) | |
1113 | #define usb_sndisocpipe(dev,endpoint) ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev,endpoint)) | |
1114 | #define usb_rcvisocpipe(dev,endpoint) ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN) | |
1115 | #define usb_sndbulkpipe(dev,endpoint) ((PIPE_BULK << 30) | __create_pipe(dev,endpoint)) | |
1116 | #define usb_rcvbulkpipe(dev,endpoint) ((PIPE_BULK << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN) | |
1117 | #define usb_sndintpipe(dev,endpoint) ((PIPE_INTERRUPT << 30) | __create_pipe(dev,endpoint)) | |
1118 | #define usb_rcvintpipe(dev,endpoint) ((PIPE_INTERRUPT << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN) | |
1119 | ||
1120 | /*-------------------------------------------------------------------------*/ | |
1121 | ||
1122 | static inline __u16 | |
1123 | usb_maxpacket(struct usb_device *udev, int pipe, int is_out) | |
1124 | { | |
1125 | struct usb_host_endpoint *ep; | |
1126 | unsigned epnum = usb_pipeendpoint(pipe); | |
1127 | ||
1128 | if (is_out) { | |
1129 | WARN_ON(usb_pipein(pipe)); | |
1130 | ep = udev->ep_out[epnum]; | |
1131 | } else { | |
1132 | WARN_ON(usb_pipeout(pipe)); | |
1133 | ep = udev->ep_in[epnum]; | |
1134 | } | |
1135 | if (!ep) | |
1136 | return 0; | |
1137 | ||
1138 | /* NOTE: only 0x07ff bits are for packet size... */ | |
1139 | return le16_to_cpu(ep->desc.wMaxPacketSize); | |
1140 | } | |
1141 | ||
1142 | /* -------------------------------------------------------------------------- */ | |
1143 | ||
1144 | #ifdef DEBUG | |
1145 | #define dbg(format, arg...) printk(KERN_DEBUG "%s: " format "\n" , __FILE__ , ## arg) | |
1146 | #else | |
1147 | #define dbg(format, arg...) do {} while (0) | |
1148 | #endif | |
1149 | ||
1150 | #define err(format, arg...) printk(KERN_ERR "%s: " format "\n" , __FILE__ , ## arg) | |
1151 | #define info(format, arg...) printk(KERN_INFO "%s: " format "\n" , __FILE__ , ## arg) | |
1152 | #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n" , __FILE__ , ## arg) | |
1153 | ||
1154 | ||
1155 | #endif /* __KERNEL__ */ | |
1156 | ||
1157 | #endif |