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e85d0918 DD |
1 | /* zd_usb.c |
2 | * | |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License as published by | |
5 | * the Free Software Foundation; either version 2 of the License, or | |
6 | * (at your option) any later version. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software | |
15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
16 | */ | |
17 | ||
18 | #include <asm/unaligned.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/firmware.h> | |
22 | #include <linux/device.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/skbuff.h> | |
25 | #include <linux/usb.h> | |
26 | #include <net/ieee80211.h> | |
27 | ||
28 | #include "zd_def.h" | |
29 | #include "zd_netdev.h" | |
30 | #include "zd_mac.h" | |
31 | #include "zd_usb.h" | |
32 | #include "zd_util.h" | |
33 | ||
34 | static struct usb_device_id usb_ids[] = { | |
35 | /* ZD1211 */ | |
36 | { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 }, | |
37 | { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 }, | |
38 | { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 }, | |
39 | { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 }, | |
40 | { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 }, | |
41 | { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 }, | |
42 | /* ZD1211B */ | |
43 | { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B }, | |
44 | { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B }, | |
45 | {} | |
46 | }; | |
47 | ||
48 | MODULE_LICENSE("GPL"); | |
49 | MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip."); | |
50 | MODULE_AUTHOR("Ulrich Kunitz"); | |
51 | MODULE_AUTHOR("Daniel Drake"); | |
52 | MODULE_VERSION("1.0"); | |
53 | MODULE_DEVICE_TABLE(usb, usb_ids); | |
54 | ||
55 | #define FW_ZD1211_PREFIX "zd1211/zd1211_" | |
56 | #define FW_ZD1211B_PREFIX "zd1211/zd1211b_" | |
57 | ||
58 | /* register address handling */ | |
59 | ||
60 | #ifdef DEBUG | |
61 | static int check_addr(struct zd_usb *usb, zd_addr_t addr) | |
62 | { | |
63 | u32 base = ZD_ADDR_BASE(addr); | |
64 | u32 offset = ZD_OFFSET(addr); | |
65 | ||
66 | if ((u32)addr & ADDR_ZERO_MASK) | |
67 | goto invalid_address; | |
68 | switch (base) { | |
69 | case USB_BASE: | |
70 | break; | |
71 | case CR_BASE: | |
72 | if (offset > CR_MAX_OFFSET) { | |
73 | dev_dbg(zd_usb_dev(usb), | |
74 | "CR offset %#010x larger than" | |
75 | " CR_MAX_OFFSET %#10x\n", | |
76 | offset, CR_MAX_OFFSET); | |
77 | goto invalid_address; | |
78 | } | |
79 | if (offset & 1) { | |
80 | dev_dbg(zd_usb_dev(usb), | |
81 | "CR offset %#010x is not a multiple of 2\n", | |
82 | offset); | |
83 | goto invalid_address; | |
84 | } | |
85 | break; | |
86 | case E2P_BASE: | |
87 | if (offset > E2P_MAX_OFFSET) { | |
88 | dev_dbg(zd_usb_dev(usb), | |
89 | "E2P offset %#010x larger than" | |
90 | " E2P_MAX_OFFSET %#010x\n", | |
91 | offset, E2P_MAX_OFFSET); | |
92 | goto invalid_address; | |
93 | } | |
94 | break; | |
95 | case FW_BASE: | |
96 | if (!usb->fw_base_offset) { | |
97 | dev_dbg(zd_usb_dev(usb), | |
98 | "ERROR: fw base offset has not been set\n"); | |
99 | return -EAGAIN; | |
100 | } | |
101 | if (offset > FW_MAX_OFFSET) { | |
102 | dev_dbg(zd_usb_dev(usb), | |
103 | "FW offset %#10x is larger than" | |
104 | " FW_MAX_OFFSET %#010x\n", | |
105 | offset, FW_MAX_OFFSET); | |
106 | goto invalid_address; | |
107 | } | |
108 | break; | |
109 | default: | |
110 | dev_dbg(zd_usb_dev(usb), | |
111 | "address has unsupported base %#010x\n", addr); | |
112 | goto invalid_address; | |
113 | } | |
114 | ||
115 | return 0; | |
116 | invalid_address: | |
117 | dev_dbg(zd_usb_dev(usb), | |
118 | "ERROR: invalid address: %#010x\n", addr); | |
119 | return -EINVAL; | |
120 | } | |
121 | #endif /* DEBUG */ | |
122 | ||
123 | static u16 usb_addr(struct zd_usb *usb, zd_addr_t addr) | |
124 | { | |
125 | u32 base; | |
126 | u16 offset; | |
127 | ||
128 | base = ZD_ADDR_BASE(addr); | |
129 | offset = ZD_OFFSET(addr); | |
130 | ||
131 | ZD_ASSERT(check_addr(usb, addr) == 0); | |
132 | ||
133 | switch (base) { | |
134 | case CR_BASE: | |
135 | offset += CR_BASE_OFFSET; | |
136 | break; | |
137 | case E2P_BASE: | |
138 | offset += E2P_BASE_OFFSET; | |
139 | break; | |
140 | case FW_BASE: | |
141 | offset += usb->fw_base_offset; | |
142 | break; | |
143 | } | |
144 | ||
145 | return offset; | |
146 | } | |
147 | ||
148 | /* USB device initialization */ | |
149 | ||
150 | static int request_fw_file( | |
151 | const struct firmware **fw, const char *name, struct device *device) | |
152 | { | |
153 | int r; | |
154 | ||
155 | dev_dbg_f(device, "fw name %s\n", name); | |
156 | ||
157 | r = request_firmware(fw, name, device); | |
158 | if (r) | |
159 | dev_err(device, | |
160 | "Could not load firmware file %s. Error number %d\n", | |
161 | name, r); | |
162 | return r; | |
163 | } | |
164 | ||
165 | static inline u16 get_bcdDevice(const struct usb_device *udev) | |
166 | { | |
167 | return le16_to_cpu(udev->descriptor.bcdDevice); | |
168 | } | |
169 | ||
170 | enum upload_code_flags { | |
171 | REBOOT = 1, | |
172 | }; | |
173 | ||
174 | /* Ensures that MAX_TRANSFER_SIZE is even. */ | |
175 | #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1) | |
176 | ||
177 | static int upload_code(struct usb_device *udev, | |
178 | const u8 *data, size_t size, u16 code_offset, int flags) | |
179 | { | |
180 | u8 *p; | |
181 | int r; | |
182 | ||
183 | /* USB request blocks need "kmalloced" buffers. | |
184 | */ | |
185 | p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL); | |
186 | if (!p) { | |
187 | dev_err(&udev->dev, "out of memory\n"); | |
188 | r = -ENOMEM; | |
189 | goto error; | |
190 | } | |
191 | ||
192 | size &= ~1; | |
193 | while (size > 0) { | |
194 | size_t transfer_size = size <= MAX_TRANSFER_SIZE ? | |
195 | size : MAX_TRANSFER_SIZE; | |
196 | ||
197 | dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size); | |
198 | ||
199 | memcpy(p, data, transfer_size); | |
200 | r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), | |
201 | USB_REQ_FIRMWARE_DOWNLOAD, | |
202 | USB_DIR_OUT | USB_TYPE_VENDOR, | |
203 | code_offset, 0, p, transfer_size, 1000 /* ms */); | |
204 | if (r < 0) { | |
205 | dev_err(&udev->dev, | |
206 | "USB control request for firmware upload" | |
207 | " failed. Error number %d\n", r); | |
208 | goto error; | |
209 | } | |
210 | transfer_size = r & ~1; | |
211 | ||
212 | size -= transfer_size; | |
213 | data += transfer_size; | |
214 | code_offset += transfer_size/sizeof(u16); | |
215 | } | |
216 | ||
217 | if (flags & REBOOT) { | |
218 | u8 ret; | |
219 | ||
220 | r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), | |
221 | USB_REQ_FIRMWARE_CONFIRM, | |
222 | USB_DIR_IN | USB_TYPE_VENDOR, | |
223 | 0, 0, &ret, sizeof(ret), 5000 /* ms */); | |
224 | if (r != sizeof(ret)) { | |
225 | dev_err(&udev->dev, | |
226 | "control request firmeware confirmation failed." | |
227 | " Return value %d\n", r); | |
228 | if (r >= 0) | |
229 | r = -ENODEV; | |
230 | goto error; | |
231 | } | |
232 | if (ret & 0x80) { | |
233 | dev_err(&udev->dev, | |
234 | "Internal error while downloading." | |
235 | " Firmware confirm return value %#04x\n", | |
236 | (unsigned int)ret); | |
237 | r = -ENODEV; | |
238 | goto error; | |
239 | } | |
240 | dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n", | |
241 | (unsigned int)ret); | |
242 | } | |
243 | ||
244 | r = 0; | |
245 | error: | |
246 | kfree(p); | |
247 | return r; | |
248 | } | |
249 | ||
250 | static u16 get_word(const void *data, u16 offset) | |
251 | { | |
252 | const __le16 *p = data; | |
253 | return le16_to_cpu(p[offset]); | |
254 | } | |
255 | ||
256 | static char *get_fw_name(char *buffer, size_t size, u8 device_type, | |
257 | const char* postfix) | |
258 | { | |
259 | scnprintf(buffer, size, "%s%s", | |
260 | device_type == DEVICE_ZD1211B ? | |
261 | FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX, | |
262 | postfix); | |
263 | return buffer; | |
264 | } | |
265 | ||
266 | static int upload_firmware(struct usb_device *udev, u8 device_type) | |
267 | { | |
268 | int r; | |
269 | u16 fw_bcdDevice; | |
270 | u16 bcdDevice; | |
271 | const struct firmware *ub_fw = NULL; | |
272 | const struct firmware *uph_fw = NULL; | |
273 | char fw_name[128]; | |
274 | ||
275 | bcdDevice = get_bcdDevice(udev); | |
276 | ||
277 | r = request_fw_file(&ub_fw, | |
278 | get_fw_name(fw_name, sizeof(fw_name), device_type, "ub"), | |
279 | &udev->dev); | |
280 | if (r) | |
281 | goto error; | |
282 | ||
283 | fw_bcdDevice = get_word(ub_fw->data, EEPROM_REGS_OFFSET); | |
284 | ||
285 | /* FIXME: do we have any reason to perform the kludge that the vendor | |
286 | * driver does when there is a version mismatch? (their driver uploads | |
287 | * different firmwares and stuff) | |
288 | */ | |
289 | if (fw_bcdDevice != bcdDevice) { | |
290 | dev_info(&udev->dev, | |
291 | "firmware device id %#06x and actual device id " | |
292 | "%#06x differ, continuing anyway\n", | |
293 | fw_bcdDevice, bcdDevice); | |
294 | } else { | |
295 | dev_dbg_f(&udev->dev, | |
296 | "firmware device id %#06x is equal to the " | |
297 | "actual device id\n", fw_bcdDevice); | |
298 | } | |
299 | ||
300 | ||
301 | r = request_fw_file(&uph_fw, | |
302 | get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"), | |
303 | &udev->dev); | |
304 | if (r) | |
305 | goto error; | |
306 | ||
307 | r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START_OFFSET, | |
308 | REBOOT); | |
309 | if (r) { | |
310 | dev_err(&udev->dev, | |
311 | "Could not upload firmware code uph. Error number %d\n", | |
312 | r); | |
313 | } | |
314 | ||
315 | /* FALL-THROUGH */ | |
316 | error: | |
317 | release_firmware(ub_fw); | |
318 | release_firmware(uph_fw); | |
319 | return r; | |
320 | } | |
321 | ||
322 | static void disable_read_regs_int(struct zd_usb *usb) | |
323 | { | |
324 | struct zd_usb_interrupt *intr = &usb->intr; | |
325 | ||
326 | ZD_ASSERT(in_interrupt()); | |
327 | spin_lock(&intr->lock); | |
328 | intr->read_regs_enabled = 0; | |
329 | spin_unlock(&intr->lock); | |
330 | } | |
331 | ||
332 | #define urb_dev(urb) (&(urb)->dev->dev) | |
333 | ||
334 | static inline void handle_regs_int(struct urb *urb) | |
335 | { | |
336 | struct zd_usb *usb = urb->context; | |
337 | struct zd_usb_interrupt *intr = &usb->intr; | |
338 | int len; | |
339 | ||
340 | ZD_ASSERT(in_interrupt()); | |
341 | spin_lock(&intr->lock); | |
342 | ||
343 | if (intr->read_regs_enabled) { | |
344 | intr->read_regs.length = len = urb->actual_length; | |
345 | ||
346 | if (len > sizeof(intr->read_regs.buffer)) | |
347 | len = sizeof(intr->read_regs.buffer); | |
348 | memcpy(intr->read_regs.buffer, urb->transfer_buffer, len); | |
349 | intr->read_regs_enabled = 0; | |
350 | complete(&intr->read_regs.completion); | |
351 | goto out; | |
352 | } | |
353 | ||
354 | dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n"); | |
355 | out: | |
356 | spin_unlock(&intr->lock); | |
357 | } | |
358 | ||
359 | static inline void handle_retry_failed_int(struct urb *urb) | |
360 | { | |
361 | dev_dbg_f(urb_dev(urb), "retry failed interrupt\n"); | |
362 | } | |
363 | ||
364 | ||
365 | static void int_urb_complete(struct urb *urb, struct pt_regs *pt_regs) | |
366 | { | |
367 | int r; | |
368 | struct usb_int_header *hdr; | |
369 | ||
370 | switch (urb->status) { | |
371 | case 0: | |
372 | break; | |
373 | case -ESHUTDOWN: | |
374 | case -EINVAL: | |
375 | case -ENODEV: | |
376 | case -ENOENT: | |
377 | case -ECONNRESET: | |
378 | goto kfree; | |
379 | case -EPIPE: | |
380 | usb_clear_halt(urb->dev, EP_INT_IN); | |
381 | /* FALL-THROUGH */ | |
382 | default: | |
383 | goto resubmit; | |
384 | } | |
385 | ||
386 | if (urb->actual_length < sizeof(hdr)) { | |
387 | dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb); | |
388 | goto resubmit; | |
389 | } | |
390 | ||
391 | hdr = urb->transfer_buffer; | |
392 | if (hdr->type != USB_INT_TYPE) { | |
393 | dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb); | |
394 | goto resubmit; | |
395 | } | |
396 | ||
397 | switch (hdr->id) { | |
398 | case USB_INT_ID_REGS: | |
399 | handle_regs_int(urb); | |
400 | break; | |
401 | case USB_INT_ID_RETRY_FAILED: | |
402 | handle_retry_failed_int(urb); | |
403 | break; | |
404 | default: | |
405 | dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb, | |
406 | (unsigned int)hdr->id); | |
407 | goto resubmit; | |
408 | } | |
409 | ||
410 | resubmit: | |
411 | r = usb_submit_urb(urb, GFP_ATOMIC); | |
412 | if (r) { | |
413 | dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb); | |
414 | goto kfree; | |
415 | } | |
416 | return; | |
417 | kfree: | |
418 | kfree(urb->transfer_buffer); | |
419 | } | |
420 | ||
421 | static inline int int_urb_interval(struct usb_device *udev) | |
422 | { | |
423 | switch (udev->speed) { | |
424 | case USB_SPEED_HIGH: | |
425 | return 4; | |
426 | case USB_SPEED_LOW: | |
427 | return 10; | |
428 | case USB_SPEED_FULL: | |
429 | default: | |
430 | return 1; | |
431 | } | |
432 | } | |
433 | ||
434 | static inline int usb_int_enabled(struct zd_usb *usb) | |
435 | { | |
436 | unsigned long flags; | |
437 | struct zd_usb_interrupt *intr = &usb->intr; | |
438 | struct urb *urb; | |
439 | ||
440 | spin_lock_irqsave(&intr->lock, flags); | |
441 | urb = intr->urb; | |
442 | spin_unlock_irqrestore(&intr->lock, flags); | |
443 | return urb != NULL; | |
444 | } | |
445 | ||
446 | int zd_usb_enable_int(struct zd_usb *usb) | |
447 | { | |
448 | int r; | |
449 | struct usb_device *udev; | |
450 | struct zd_usb_interrupt *intr = &usb->intr; | |
451 | void *transfer_buffer = NULL; | |
452 | struct urb *urb; | |
453 | ||
454 | dev_dbg_f(zd_usb_dev(usb), "\n"); | |
455 | ||
456 | urb = usb_alloc_urb(0, GFP_NOFS); | |
457 | if (!urb) { | |
458 | r = -ENOMEM; | |
459 | goto out; | |
460 | } | |
461 | ||
462 | ZD_ASSERT(!irqs_disabled()); | |
463 | spin_lock_irq(&intr->lock); | |
464 | if (intr->urb) { | |
465 | spin_unlock_irq(&intr->lock); | |
466 | r = 0; | |
467 | goto error_free_urb; | |
468 | } | |
469 | intr->urb = urb; | |
470 | spin_unlock_irq(&intr->lock); | |
471 | ||
472 | /* TODO: make it a DMA buffer */ | |
473 | r = -ENOMEM; | |
474 | transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_NOFS); | |
475 | if (!transfer_buffer) { | |
476 | dev_dbg_f(zd_usb_dev(usb), | |
477 | "couldn't allocate transfer_buffer\n"); | |
478 | goto error_set_urb_null; | |
479 | } | |
480 | ||
481 | udev = zd_usb_to_usbdev(usb); | |
482 | usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN), | |
483 | transfer_buffer, USB_MAX_EP_INT_BUFFER, | |
484 | int_urb_complete, usb, | |
485 | intr->interval); | |
486 | ||
487 | dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb); | |
488 | r = usb_submit_urb(urb, GFP_NOFS); | |
489 | if (r) { | |
490 | dev_dbg_f(zd_usb_dev(usb), | |
491 | "Couldn't submit urb. Error number %d\n", r); | |
492 | goto error; | |
493 | } | |
494 | ||
495 | return 0; | |
496 | error: | |
497 | kfree(transfer_buffer); | |
498 | error_set_urb_null: | |
499 | spin_lock_irq(&intr->lock); | |
500 | intr->urb = NULL; | |
501 | spin_unlock_irq(&intr->lock); | |
502 | error_free_urb: | |
503 | usb_free_urb(urb); | |
504 | out: | |
505 | return r; | |
506 | } | |
507 | ||
508 | void zd_usb_disable_int(struct zd_usb *usb) | |
509 | { | |
510 | unsigned long flags; | |
511 | struct zd_usb_interrupt *intr = &usb->intr; | |
512 | struct urb *urb; | |
513 | ||
514 | spin_lock_irqsave(&intr->lock, flags); | |
515 | urb = intr->urb; | |
516 | if (!urb) { | |
517 | spin_unlock_irqrestore(&intr->lock, flags); | |
518 | return; | |
519 | } | |
520 | intr->urb = NULL; | |
521 | spin_unlock_irqrestore(&intr->lock, flags); | |
522 | ||
523 | usb_kill_urb(urb); | |
524 | dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb); | |
525 | usb_free_urb(urb); | |
526 | } | |
527 | ||
528 | static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer, | |
529 | unsigned int length) | |
530 | { | |
531 | int i; | |
532 | struct zd_mac *mac = zd_usb_to_mac(usb); | |
533 | const struct rx_length_info *length_info; | |
534 | ||
535 | if (length < sizeof(struct rx_length_info)) { | |
536 | /* It's not a complete packet anyhow. */ | |
537 | return; | |
538 | } | |
539 | length_info = (struct rx_length_info *) | |
540 | (buffer + length - sizeof(struct rx_length_info)); | |
541 | ||
542 | /* It might be that three frames are merged into a single URB | |
543 | * transaction. We have to check for the length info tag. | |
544 | * | |
545 | * While testing we discovered that length_info might be unaligned, | |
546 | * because if USB transactions are merged, the last packet will not | |
547 | * be padded. Unaligned access might also happen if the length_info | |
548 | * structure is not present. | |
549 | */ | |
550 | if (get_unaligned(&length_info->tag) == RX_LENGTH_INFO_TAG) { | |
551 | unsigned int l, k, n; | |
552 | for (i = 0, l = 0;; i++) { | |
553 | k = le16_to_cpu(get_unaligned( | |
554 | &length_info->length[i])); | |
555 | n = l+k; | |
556 | if (n > length) | |
557 | return; | |
558 | zd_mac_rx(mac, buffer+l, k); | |
559 | if (i >= 2) | |
560 | return; | |
561 | l = (n+3) & ~3; | |
562 | } | |
563 | } else { | |
564 | zd_mac_rx(mac, buffer, length); | |
565 | } | |
566 | } | |
567 | ||
568 | static void rx_urb_complete(struct urb *urb, struct pt_regs *pt_regs) | |
569 | { | |
570 | struct zd_usb *usb; | |
571 | struct zd_usb_rx *rx; | |
572 | const u8 *buffer; | |
573 | unsigned int length; | |
574 | ||
575 | switch (urb->status) { | |
576 | case 0: | |
577 | break; | |
578 | case -ESHUTDOWN: | |
579 | case -EINVAL: | |
580 | case -ENODEV: | |
581 | case -ENOENT: | |
582 | case -ECONNRESET: | |
583 | return; | |
584 | case -EPIPE: | |
585 | usb_clear_halt(urb->dev, EP_DATA_IN); | |
586 | /* FALL-THROUGH */ | |
587 | default: | |
588 | dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); | |
589 | goto resubmit; | |
590 | } | |
591 | ||
592 | buffer = urb->transfer_buffer; | |
593 | length = urb->actual_length; | |
594 | usb = urb->context; | |
595 | rx = &usb->rx; | |
596 | ||
597 | if (length%rx->usb_packet_size > rx->usb_packet_size-4) { | |
598 | /* If there is an old first fragment, we don't care. */ | |
599 | dev_dbg_f(urb_dev(urb), "*** first fragment ***\n"); | |
600 | ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment)); | |
601 | spin_lock(&rx->lock); | |
602 | memcpy(rx->fragment, buffer, length); | |
603 | rx->fragment_length = length; | |
604 | spin_unlock(&rx->lock); | |
605 | goto resubmit; | |
606 | } | |
607 | ||
608 | spin_lock(&rx->lock); | |
609 | if (rx->fragment_length > 0) { | |
610 | /* We are on a second fragment, we believe */ | |
611 | ZD_ASSERT(length + rx->fragment_length <= | |
612 | ARRAY_SIZE(rx->fragment)); | |
613 | dev_dbg_f(urb_dev(urb), "*** second fragment ***\n"); | |
614 | memcpy(rx->fragment+rx->fragment_length, buffer, length); | |
615 | handle_rx_packet(usb, rx->fragment, | |
616 | rx->fragment_length + length); | |
617 | rx->fragment_length = 0; | |
618 | spin_unlock(&rx->lock); | |
619 | } else { | |
620 | spin_unlock(&rx->lock); | |
621 | handle_rx_packet(usb, buffer, length); | |
622 | } | |
623 | ||
624 | resubmit: | |
625 | usb_submit_urb(urb, GFP_ATOMIC); | |
626 | } | |
627 | ||
628 | struct urb *alloc_urb(struct zd_usb *usb) | |
629 | { | |
630 | struct usb_device *udev = zd_usb_to_usbdev(usb); | |
631 | struct urb *urb; | |
632 | void *buffer; | |
633 | ||
634 | urb = usb_alloc_urb(0, GFP_NOFS); | |
635 | if (!urb) | |
636 | return NULL; | |
637 | buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS, | |
638 | &urb->transfer_dma); | |
639 | if (!buffer) { | |
640 | usb_free_urb(urb); | |
641 | return NULL; | |
642 | } | |
643 | ||
644 | usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN), | |
645 | buffer, USB_MAX_RX_SIZE, | |
646 | rx_urb_complete, usb); | |
647 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
648 | ||
649 | return urb; | |
650 | } | |
651 | ||
652 | void free_urb(struct urb *urb) | |
653 | { | |
654 | if (!urb) | |
655 | return; | |
656 | usb_buffer_free(urb->dev, urb->transfer_buffer_length, | |
657 | urb->transfer_buffer, urb->transfer_dma); | |
658 | usb_free_urb(urb); | |
659 | } | |
660 | ||
661 | int zd_usb_enable_rx(struct zd_usb *usb) | |
662 | { | |
663 | int i, r; | |
664 | struct zd_usb_rx *rx = &usb->rx; | |
665 | struct urb **urbs; | |
666 | ||
667 | dev_dbg_f(zd_usb_dev(usb), "\n"); | |
668 | ||
669 | r = -ENOMEM; | |
670 | urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS); | |
671 | if (!urbs) | |
672 | goto error; | |
673 | for (i = 0; i < URBS_COUNT; i++) { | |
674 | urbs[i] = alloc_urb(usb); | |
675 | if (!urbs[i]) | |
676 | goto error; | |
677 | } | |
678 | ||
679 | ZD_ASSERT(!irqs_disabled()); | |
680 | spin_lock_irq(&rx->lock); | |
681 | if (rx->urbs) { | |
682 | spin_unlock_irq(&rx->lock); | |
683 | r = 0; | |
684 | goto error; | |
685 | } | |
686 | rx->urbs = urbs; | |
687 | rx->urbs_count = URBS_COUNT; | |
688 | spin_unlock_irq(&rx->lock); | |
689 | ||
690 | for (i = 0; i < URBS_COUNT; i++) { | |
691 | r = usb_submit_urb(urbs[i], GFP_NOFS); | |
692 | if (r) | |
693 | goto error_submit; | |
694 | } | |
695 | ||
696 | return 0; | |
697 | error_submit: | |
698 | for (i = 0; i < URBS_COUNT; i++) { | |
699 | usb_kill_urb(urbs[i]); | |
700 | } | |
701 | spin_lock_irq(&rx->lock); | |
702 | rx->urbs = NULL; | |
703 | rx->urbs_count = 0; | |
704 | spin_unlock_irq(&rx->lock); | |
705 | error: | |
706 | if (urbs) { | |
707 | for (i = 0; i < URBS_COUNT; i++) | |
708 | free_urb(urbs[i]); | |
709 | } | |
710 | return r; | |
711 | } | |
712 | ||
713 | void zd_usb_disable_rx(struct zd_usb *usb) | |
714 | { | |
715 | int i; | |
716 | unsigned long flags; | |
717 | struct urb **urbs; | |
718 | unsigned int count; | |
719 | struct zd_usb_rx *rx = &usb->rx; | |
720 | ||
721 | spin_lock_irqsave(&rx->lock, flags); | |
722 | urbs = rx->urbs; | |
723 | count = rx->urbs_count; | |
724 | spin_unlock_irqrestore(&rx->lock, flags); | |
725 | if (!urbs) | |
726 | return; | |
727 | ||
728 | for (i = 0; i < count; i++) { | |
729 | usb_kill_urb(urbs[i]); | |
730 | free_urb(urbs[i]); | |
731 | } | |
732 | kfree(urbs); | |
733 | ||
734 | spin_lock_irqsave(&rx->lock, flags); | |
735 | rx->urbs = NULL; | |
736 | rx->urbs_count = 0; | |
737 | spin_unlock_irqrestore(&rx->lock, flags); | |
738 | } | |
739 | ||
740 | static void tx_urb_complete(struct urb *urb, struct pt_regs *pt_regs) | |
741 | { | |
742 | int r; | |
743 | ||
744 | switch (urb->status) { | |
745 | case 0: | |
746 | break; | |
747 | case -ESHUTDOWN: | |
748 | case -EINVAL: | |
749 | case -ENODEV: | |
750 | case -ENOENT: | |
751 | case -ECONNRESET: | |
752 | dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); | |
753 | break; | |
754 | case -EPIPE: | |
755 | usb_clear_halt(urb->dev, EP_DATA_OUT); | |
756 | /* FALL-THROUGH */ | |
757 | default: | |
758 | dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status); | |
759 | goto resubmit; | |
760 | } | |
761 | free_urb: | |
762 | usb_buffer_free(urb->dev, urb->transfer_buffer_length, | |
763 | urb->transfer_buffer, urb->transfer_dma); | |
764 | usb_free_urb(urb); | |
765 | return; | |
766 | resubmit: | |
767 | r = usb_submit_urb(urb, GFP_ATOMIC); | |
768 | if (r) { | |
769 | dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r); | |
770 | goto free_urb; | |
771 | } | |
772 | } | |
773 | ||
774 | /* Puts the frame on the USB endpoint. It doesn't wait for | |
775 | * completion. The frame must contain the control set. | |
776 | */ | |
777 | int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length) | |
778 | { | |
779 | int r; | |
780 | struct usb_device *udev = zd_usb_to_usbdev(usb); | |
781 | struct urb *urb; | |
782 | void *buffer; | |
783 | ||
784 | urb = usb_alloc_urb(0, GFP_ATOMIC); | |
785 | if (!urb) { | |
786 | r = -ENOMEM; | |
787 | goto out; | |
788 | } | |
789 | ||
790 | buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC, | |
791 | &urb->transfer_dma); | |
792 | if (!buffer) { | |
793 | r = -ENOMEM; | |
794 | goto error_free_urb; | |
795 | } | |
796 | memcpy(buffer, frame, length); | |
797 | ||
798 | usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT), | |
799 | buffer, length, tx_urb_complete, NULL); | |
800 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
801 | ||
802 | r = usb_submit_urb(urb, GFP_ATOMIC); | |
803 | if (r) | |
804 | goto error; | |
805 | return 0; | |
806 | error: | |
807 | usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer, | |
808 | urb->transfer_dma); | |
809 | error_free_urb: | |
810 | usb_free_urb(urb); | |
811 | out: | |
812 | return r; | |
813 | } | |
814 | ||
815 | static inline void init_usb_interrupt(struct zd_usb *usb) | |
816 | { | |
817 | struct zd_usb_interrupt *intr = &usb->intr; | |
818 | ||
819 | spin_lock_init(&intr->lock); | |
820 | intr->interval = int_urb_interval(zd_usb_to_usbdev(usb)); | |
821 | init_completion(&intr->read_regs.completion); | |
822 | intr->read_regs.cr_int_addr = cpu_to_le16(usb_addr(usb, CR_INTERRUPT)); | |
823 | } | |
824 | ||
825 | static inline void init_usb_rx(struct zd_usb *usb) | |
826 | { | |
827 | struct zd_usb_rx *rx = &usb->rx; | |
828 | spin_lock_init(&rx->lock); | |
829 | if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) { | |
830 | rx->usb_packet_size = 512; | |
831 | } else { | |
832 | rx->usb_packet_size = 64; | |
833 | } | |
834 | ZD_ASSERT(rx->fragment_length == 0); | |
835 | } | |
836 | ||
837 | static inline void init_usb_tx(struct zd_usb *usb) | |
838 | { | |
839 | /* FIXME: at this point we will allocate a fixed number of urb's for | |
840 | * use in a cyclic scheme */ | |
841 | } | |
842 | ||
843 | void zd_usb_init(struct zd_usb *usb, struct net_device *netdev, | |
844 | struct usb_interface *intf) | |
845 | { | |
846 | memset(usb, 0, sizeof(*usb)); | |
847 | usb->intf = usb_get_intf(intf); | |
848 | usb_set_intfdata(usb->intf, netdev); | |
849 | init_usb_interrupt(usb); | |
850 | init_usb_tx(usb); | |
851 | init_usb_rx(usb); | |
852 | } | |
853 | ||
854 | int zd_usb_init_hw(struct zd_usb *usb) | |
855 | { | |
856 | int r; | |
857 | struct zd_chip *chip = zd_usb_to_chip(usb); | |
858 | ||
859 | ZD_ASSERT(mutex_is_locked(&chip->mutex)); | |
860 | r = zd_ioread16_locked(chip, &usb->fw_base_offset, | |
861 | USB_REG((u16)FW_BASE_ADDR_OFFSET)); | |
862 | if (r) | |
863 | return r; | |
864 | dev_dbg_f(zd_usb_dev(usb), "fw_base_offset: %#06hx\n", | |
865 | usb->fw_base_offset); | |
866 | ||
867 | return 0; | |
868 | } | |
869 | ||
870 | void zd_usb_clear(struct zd_usb *usb) | |
871 | { | |
872 | usb_set_intfdata(usb->intf, NULL); | |
873 | usb_put_intf(usb->intf); | |
874 | memset(usb, 0, sizeof(*usb)); | |
875 | /* FIXME: usb_interrupt, usb_tx, usb_rx? */ | |
876 | } | |
877 | ||
878 | static const char *speed(enum usb_device_speed speed) | |
879 | { | |
880 | switch (speed) { | |
881 | case USB_SPEED_LOW: | |
882 | return "low"; | |
883 | case USB_SPEED_FULL: | |
884 | return "full"; | |
885 | case USB_SPEED_HIGH: | |
886 | return "high"; | |
887 | default: | |
888 | return "unknown speed"; | |
889 | } | |
890 | } | |
891 | ||
892 | static int scnprint_id(struct usb_device *udev, char *buffer, size_t size) | |
893 | { | |
894 | return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s", | |
895 | le16_to_cpu(udev->descriptor.idVendor), | |
896 | le16_to_cpu(udev->descriptor.idProduct), | |
897 | get_bcdDevice(udev), | |
898 | speed(udev->speed)); | |
899 | } | |
900 | ||
901 | int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size) | |
902 | { | |
903 | struct usb_device *udev = interface_to_usbdev(usb->intf); | |
904 | return scnprint_id(udev, buffer, size); | |
905 | } | |
906 | ||
907 | #ifdef DEBUG | |
908 | static void print_id(struct usb_device *udev) | |
909 | { | |
910 | char buffer[40]; | |
911 | ||
912 | scnprint_id(udev, buffer, sizeof(buffer)); | |
913 | buffer[sizeof(buffer)-1] = 0; | |
914 | dev_dbg_f(&udev->dev, "%s\n", buffer); | |
915 | } | |
916 | #else | |
917 | #define print_id(udev) do { } while (0) | |
918 | #endif | |
919 | ||
920 | static int probe(struct usb_interface *intf, const struct usb_device_id *id) | |
921 | { | |
922 | int r; | |
923 | struct usb_device *udev = interface_to_usbdev(intf); | |
924 | struct net_device *netdev = NULL; | |
925 | ||
926 | print_id(udev); | |
927 | ||
928 | switch (udev->speed) { | |
929 | case USB_SPEED_LOW: | |
930 | case USB_SPEED_FULL: | |
931 | case USB_SPEED_HIGH: | |
932 | break; | |
933 | default: | |
934 | dev_dbg_f(&intf->dev, "Unknown USB speed\n"); | |
935 | r = -ENODEV; | |
936 | goto error; | |
937 | } | |
938 | ||
939 | netdev = zd_netdev_alloc(intf); | |
940 | if (netdev == NULL) { | |
941 | r = -ENOMEM; | |
942 | goto error; | |
943 | } | |
944 | ||
945 | r = upload_firmware(udev, id->driver_info); | |
946 | if (r) { | |
947 | dev_err(&intf->dev, | |
948 | "couldn't load firmware. Error number %d\n", r); | |
949 | goto error; | |
950 | } | |
951 | ||
952 | r = usb_reset_configuration(udev); | |
953 | if (r) { | |
954 | dev_dbg_f(&intf->dev, | |
955 | "couldn't reset configuration. Error number %d\n", r); | |
956 | goto error; | |
957 | } | |
958 | ||
959 | /* At this point the interrupt endpoint is not generally enabled. We | |
960 | * save the USB bandwidth until the network device is opened. But | |
961 | * notify that the initialization of the MAC will require the | |
962 | * interrupts to be temporary enabled. | |
963 | */ | |
964 | r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info); | |
965 | if (r) { | |
966 | dev_dbg_f(&intf->dev, | |
967 | "couldn't initialize mac. Error number %d\n", r); | |
968 | goto error; | |
969 | } | |
970 | ||
971 | r = register_netdev(netdev); | |
972 | if (r) { | |
973 | dev_dbg_f(&intf->dev, | |
974 | "couldn't register netdev. Error number %d\n", r); | |
975 | goto error; | |
976 | } | |
977 | ||
978 | dev_dbg_f(&intf->dev, "successful\n"); | |
979 | dev_info(&intf->dev,"%s\n", netdev->name); | |
980 | return 0; | |
981 | error: | |
982 | usb_reset_device(interface_to_usbdev(intf)); | |
983 | zd_netdev_free(netdev); | |
984 | return r; | |
985 | } | |
986 | ||
987 | static void disconnect(struct usb_interface *intf) | |
988 | { | |
989 | struct net_device *netdev = zd_intf_to_netdev(intf); | |
990 | struct zd_mac *mac = zd_netdev_mac(netdev); | |
991 | struct zd_usb *usb = &mac->chip.usb; | |
992 | ||
993 | dev_dbg_f(zd_usb_dev(usb), "\n"); | |
994 | ||
995 | zd_netdev_disconnect(netdev); | |
996 | ||
997 | /* Just in case something has gone wrong! */ | |
998 | zd_usb_disable_rx(usb); | |
999 | zd_usb_disable_int(usb); | |
1000 | ||
1001 | /* If the disconnect has been caused by a removal of the | |
1002 | * driver module, the reset allows reloading of the driver. If the | |
1003 | * reset will not be executed here, the upload of the firmware in the | |
1004 | * probe function caused by the reloading of the driver will fail. | |
1005 | */ | |
1006 | usb_reset_device(interface_to_usbdev(intf)); | |
1007 | ||
1008 | /* If somebody still waits on this lock now, this is an error. */ | |
1009 | zd_netdev_free(netdev); | |
1010 | dev_dbg(&intf->dev, "disconnected\n"); | |
1011 | } | |
1012 | ||
1013 | static struct usb_driver driver = { | |
1014 | .name = "zd1211rw", | |
1015 | .id_table = usb_ids, | |
1016 | .probe = probe, | |
1017 | .disconnect = disconnect, | |
1018 | }; | |
1019 | ||
1020 | static int __init usb_init(void) | |
1021 | { | |
1022 | int r; | |
1023 | ||
1024 | pr_debug("usb_init()\n"); | |
1025 | ||
1026 | r = usb_register(&driver); | |
1027 | if (r) { | |
1028 | printk(KERN_ERR "usb_register() failed. Error number %d\n", r); | |
1029 | return r; | |
1030 | } | |
1031 | ||
1032 | pr_debug("zd1211rw initialized\n"); | |
1033 | return 0; | |
1034 | } | |
1035 | ||
1036 | static void __exit usb_exit(void) | |
1037 | { | |
1038 | pr_debug("usb_exit()\n"); | |
1039 | usb_deregister(&driver); | |
1040 | } | |
1041 | ||
1042 | module_init(usb_init); | |
1043 | module_exit(usb_exit); | |
1044 | ||
1045 | static int usb_int_regs_length(unsigned int count) | |
1046 | { | |
1047 | return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data); | |
1048 | } | |
1049 | ||
1050 | static void prepare_read_regs_int(struct zd_usb *usb) | |
1051 | { | |
1052 | struct zd_usb_interrupt *intr = &usb->intr; | |
1053 | ||
1054 | spin_lock(&intr->lock); | |
1055 | intr->read_regs_enabled = 1; | |
1056 | INIT_COMPLETION(intr->read_regs.completion); | |
1057 | spin_unlock(&intr->lock); | |
1058 | } | |
1059 | ||
1060 | static int get_results(struct zd_usb *usb, u16 *values, | |
1061 | struct usb_req_read_regs *req, unsigned int count) | |
1062 | { | |
1063 | int r; | |
1064 | int i; | |
1065 | struct zd_usb_interrupt *intr = &usb->intr; | |
1066 | struct read_regs_int *rr = &intr->read_regs; | |
1067 | struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer; | |
1068 | ||
1069 | spin_lock(&intr->lock); | |
1070 | ||
1071 | r = -EIO; | |
1072 | /* The created block size seems to be larger than expected. | |
1073 | * However results appear to be correct. | |
1074 | */ | |
1075 | if (rr->length < usb_int_regs_length(count)) { | |
1076 | dev_dbg_f(zd_usb_dev(usb), | |
1077 | "error: actual length %d less than expected %d\n", | |
1078 | rr->length, usb_int_regs_length(count)); | |
1079 | goto error_unlock; | |
1080 | } | |
1081 | if (rr->length > sizeof(rr->buffer)) { | |
1082 | dev_dbg_f(zd_usb_dev(usb), | |
1083 | "error: actual length %d exceeds buffer size %zu\n", | |
1084 | rr->length, sizeof(rr->buffer)); | |
1085 | goto error_unlock; | |
1086 | } | |
1087 | ||
1088 | for (i = 0; i < count; i++) { | |
1089 | struct reg_data *rd = ®s->regs[i]; | |
1090 | if (rd->addr != req->addr[i]) { | |
1091 | dev_dbg_f(zd_usb_dev(usb), | |
1092 | "rd[%d] addr %#06hx expected %#06hx\n", i, | |
1093 | le16_to_cpu(rd->addr), | |
1094 | le16_to_cpu(req->addr[i])); | |
1095 | goto error_unlock; | |
1096 | } | |
1097 | values[i] = le16_to_cpu(rd->value); | |
1098 | } | |
1099 | ||
1100 | r = 0; | |
1101 | error_unlock: | |
1102 | spin_unlock(&intr->lock); | |
1103 | return r; | |
1104 | } | |
1105 | ||
1106 | int zd_usb_ioread16v(struct zd_usb *usb, u16 *values, | |
1107 | const zd_addr_t *addresses, unsigned int count) | |
1108 | { | |
1109 | int r; | |
1110 | int i, req_len, actual_req_len; | |
1111 | struct usb_device *udev; | |
1112 | struct usb_req_read_regs *req = NULL; | |
1113 | unsigned long timeout; | |
1114 | ||
1115 | if (count < 1) { | |
1116 | dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n"); | |
1117 | return -EINVAL; | |
1118 | } | |
1119 | if (count > USB_MAX_IOREAD16_COUNT) { | |
1120 | dev_dbg_f(zd_usb_dev(usb), | |
1121 | "error: count %u exceeds possible max %u\n", | |
1122 | count, USB_MAX_IOREAD16_COUNT); | |
1123 | return -EINVAL; | |
1124 | } | |
1125 | if (in_atomic()) { | |
1126 | dev_dbg_f(zd_usb_dev(usb), | |
1127 | "error: io in atomic context not supported\n"); | |
1128 | return -EWOULDBLOCK; | |
1129 | } | |
1130 | if (!usb_int_enabled(usb)) { | |
1131 | dev_dbg_f(zd_usb_dev(usb), | |
1132 | "error: usb interrupt not enabled\n"); | |
1133 | return -EWOULDBLOCK; | |
1134 | } | |
1135 | ||
1136 | req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16); | |
1137 | req = kmalloc(req_len, GFP_NOFS); | |
1138 | if (!req) | |
1139 | return -ENOMEM; | |
1140 | req->id = cpu_to_le16(USB_REQ_READ_REGS); | |
1141 | for (i = 0; i < count; i++) | |
1142 | req->addr[i] = cpu_to_le16(usb_addr(usb, addresses[i])); | |
1143 | ||
1144 | udev = zd_usb_to_usbdev(usb); | |
1145 | prepare_read_regs_int(usb); | |
1146 | r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT), | |
1147 | req, req_len, &actual_req_len, 1000 /* ms */); | |
1148 | if (r) { | |
1149 | dev_dbg_f(zd_usb_dev(usb), | |
1150 | "error in usb_bulk_msg(). Error number %d\n", r); | |
1151 | goto error; | |
1152 | } | |
1153 | if (req_len != actual_req_len) { | |
1154 | dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n" | |
1155 | " req_len %d != actual_req_len %d\n", | |
1156 | req_len, actual_req_len); | |
1157 | r = -EIO; | |
1158 | goto error; | |
1159 | } | |
1160 | ||
1161 | timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion, | |
1162 | msecs_to_jiffies(1000)); | |
1163 | if (!timeout) { | |
1164 | disable_read_regs_int(usb); | |
1165 | dev_dbg_f(zd_usb_dev(usb), "read timed out\n"); | |
1166 | r = -ETIMEDOUT; | |
1167 | goto error; | |
1168 | } | |
1169 | ||
1170 | r = get_results(usb, values, req, count); | |
1171 | error: | |
1172 | kfree(req); | |
1173 | return r; | |
1174 | } | |
1175 | ||
1176 | int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs, | |
1177 | unsigned int count) | |
1178 | { | |
1179 | int r; | |
1180 | struct usb_device *udev; | |
1181 | struct usb_req_write_regs *req = NULL; | |
1182 | int i, req_len, actual_req_len; | |
1183 | ||
1184 | if (count == 0) | |
1185 | return 0; | |
1186 | if (count > USB_MAX_IOWRITE16_COUNT) { | |
1187 | dev_dbg_f(zd_usb_dev(usb), | |
1188 | "error: count %u exceeds possible max %u\n", | |
1189 | count, USB_MAX_IOWRITE16_COUNT); | |
1190 | return -EINVAL; | |
1191 | } | |
1192 | if (in_atomic()) { | |
1193 | dev_dbg_f(zd_usb_dev(usb), | |
1194 | "error: io in atomic context not supported\n"); | |
1195 | return -EWOULDBLOCK; | |
1196 | } | |
1197 | ||
1198 | req_len = sizeof(struct usb_req_write_regs) + | |
1199 | count * sizeof(struct reg_data); | |
1200 | req = kmalloc(req_len, GFP_NOFS); | |
1201 | if (!req) | |
1202 | return -ENOMEM; | |
1203 | ||
1204 | req->id = cpu_to_le16(USB_REQ_WRITE_REGS); | |
1205 | for (i = 0; i < count; i++) { | |
1206 | struct reg_data *rw = &req->reg_writes[i]; | |
1207 | rw->addr = cpu_to_le16(usb_addr(usb, ioreqs[i].addr)); | |
1208 | rw->value = cpu_to_le16(ioreqs[i].value); | |
1209 | } | |
1210 | ||
1211 | udev = zd_usb_to_usbdev(usb); | |
1212 | r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT), | |
1213 | req, req_len, &actual_req_len, 1000 /* ms */); | |
1214 | if (r) { | |
1215 | dev_dbg_f(zd_usb_dev(usb), | |
1216 | "error in usb_bulk_msg(). Error number %d\n", r); | |
1217 | goto error; | |
1218 | } | |
1219 | if (req_len != actual_req_len) { | |
1220 | dev_dbg_f(zd_usb_dev(usb), | |
1221 | "error in usb_bulk_msg()" | |
1222 | " req_len %d != actual_req_len %d\n", | |
1223 | req_len, actual_req_len); | |
1224 | r = -EIO; | |
1225 | goto error; | |
1226 | } | |
1227 | ||
1228 | /* FALL-THROUGH with r == 0 */ | |
1229 | error: | |
1230 | kfree(req); | |
1231 | return r; | |
1232 | } | |
1233 | ||
1234 | int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits) | |
1235 | { | |
1236 | int r; | |
1237 | struct usb_device *udev; | |
1238 | struct usb_req_rfwrite *req = NULL; | |
1239 | int i, req_len, actual_req_len; | |
1240 | u16 bit_value_template; | |
1241 | ||
1242 | if (in_atomic()) { | |
1243 | dev_dbg_f(zd_usb_dev(usb), | |
1244 | "error: io in atomic context not supported\n"); | |
1245 | return -EWOULDBLOCK; | |
1246 | } | |
1247 | if (bits < USB_MIN_RFWRITE_BIT_COUNT) { | |
1248 | dev_dbg_f(zd_usb_dev(usb), | |
1249 | "error: bits %d are smaller than" | |
1250 | " USB_MIN_RFWRITE_BIT_COUNT %d\n", | |
1251 | bits, USB_MIN_RFWRITE_BIT_COUNT); | |
1252 | return -EINVAL; | |
1253 | } | |
1254 | if (bits > USB_MAX_RFWRITE_BIT_COUNT) { | |
1255 | dev_dbg_f(zd_usb_dev(usb), | |
1256 | "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n", | |
1257 | bits, USB_MAX_RFWRITE_BIT_COUNT); | |
1258 | return -EINVAL; | |
1259 | } | |
1260 | #ifdef DEBUG | |
1261 | if (value & (~0UL << bits)) { | |
1262 | dev_dbg_f(zd_usb_dev(usb), | |
1263 | "error: value %#09x has bits >= %d set\n", | |
1264 | value, bits); | |
1265 | return -EINVAL; | |
1266 | } | |
1267 | #endif /* DEBUG */ | |
1268 | ||
1269 | dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits); | |
1270 | ||
1271 | r = zd_usb_ioread16(usb, &bit_value_template, CR203); | |
1272 | if (r) { | |
1273 | dev_dbg_f(zd_usb_dev(usb), | |
1274 | "error %d: Couldn't read CR203\n", r); | |
1275 | goto out; | |
1276 | } | |
1277 | bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA); | |
1278 | ||
1279 | req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16); | |
1280 | req = kmalloc(req_len, GFP_NOFS); | |
1281 | if (!req) | |
1282 | return -ENOMEM; | |
1283 | ||
1284 | req->id = cpu_to_le16(USB_REQ_WRITE_RF); | |
1285 | /* 1: 3683a, but not used in ZYDAS driver */ | |
1286 | req->value = cpu_to_le16(2); | |
1287 | req->bits = cpu_to_le16(bits); | |
1288 | ||
1289 | for (i = 0; i < bits; i++) { | |
1290 | u16 bv = bit_value_template; | |
1291 | if (value & (1 << (bits-1-i))) | |
1292 | bv |= RF_DATA; | |
1293 | req->bit_values[i] = cpu_to_le16(bv); | |
1294 | } | |
1295 | ||
1296 | udev = zd_usb_to_usbdev(usb); | |
1297 | r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT), | |
1298 | req, req_len, &actual_req_len, 1000 /* ms */); | |
1299 | if (r) { | |
1300 | dev_dbg_f(zd_usb_dev(usb), | |
1301 | "error in usb_bulk_msg(). Error number %d\n", r); | |
1302 | goto out; | |
1303 | } | |
1304 | if (req_len != actual_req_len) { | |
1305 | dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()" | |
1306 | " req_len %d != actual_req_len %d\n", | |
1307 | req_len, actual_req_len); | |
1308 | r = -EIO; | |
1309 | goto out; | |
1310 | } | |
1311 | ||
1312 | /* FALL-THROUGH with r == 0 */ | |
1313 | out: | |
1314 | kfree(req); | |
1315 | return r; | |
1316 | } |