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[deliverable/linux.git] / drivers / net / wireless / zd1211rw / zd_usb.c
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/kernel.h>
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <linux/firmware.h>
23 #include <linux/device.h>
24 #include <linux/errno.h>
25 #include <linux/skbuff.h>
26 #include <linux/usb.h>
27 #include <linux/workqueue.h>
28 #include <net/ieee80211.h>
29
30 #include "zd_def.h"
31 #include "zd_netdev.h"
32 #include "zd_mac.h"
33 #include "zd_usb.h"
34 #include "zd_util.h"
35
36 static struct usb_device_id usb_ids[] = {
37 /* ZD1211 */
38 { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
39 { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
40 { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
41 { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
42 { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
43 { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
44 { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
45 { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
46 { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
47 { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
48 { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
49 { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
50 { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
51 { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
52 { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
53 { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
54 { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
55 /* ZD1211B */
56 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
57 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
58 { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
59 { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
60 { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
61 { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
62 { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
63 /* "Driverless" devices that need ejecting */
64 { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
65 {}
66 };
67
68 MODULE_LICENSE("GPL");
69 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
70 MODULE_AUTHOR("Ulrich Kunitz");
71 MODULE_AUTHOR("Daniel Drake");
72 MODULE_VERSION("1.0");
73 MODULE_DEVICE_TABLE(usb, usb_ids);
74
75 #define FW_ZD1211_PREFIX "zd1211/zd1211_"
76 #define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
77
78 /* register address handling */
79
80 #ifdef DEBUG
81 static int check_addr(struct zd_usb *usb, zd_addr_t addr)
82 {
83 u32 base = ZD_ADDR_BASE(addr);
84 u32 offset = ZD_OFFSET(addr);
85
86 if ((u32)addr & ADDR_ZERO_MASK)
87 goto invalid_address;
88 switch (base) {
89 case USB_BASE:
90 break;
91 case CR_BASE:
92 if (offset > CR_MAX_OFFSET) {
93 dev_dbg(zd_usb_dev(usb),
94 "CR offset %#010x larger than"
95 " CR_MAX_OFFSET %#10x\n",
96 offset, CR_MAX_OFFSET);
97 goto invalid_address;
98 }
99 if (offset & 1) {
100 dev_dbg(zd_usb_dev(usb),
101 "CR offset %#010x is not a multiple of 2\n",
102 offset);
103 goto invalid_address;
104 }
105 break;
106 case E2P_BASE:
107 if (offset > E2P_MAX_OFFSET) {
108 dev_dbg(zd_usb_dev(usb),
109 "E2P offset %#010x larger than"
110 " E2P_MAX_OFFSET %#010x\n",
111 offset, E2P_MAX_OFFSET);
112 goto invalid_address;
113 }
114 break;
115 case FW_BASE:
116 if (!usb->fw_base_offset) {
117 dev_dbg(zd_usb_dev(usb),
118 "ERROR: fw base offset has not been set\n");
119 return -EAGAIN;
120 }
121 if (offset > FW_MAX_OFFSET) {
122 dev_dbg(zd_usb_dev(usb),
123 "FW offset %#10x is larger than"
124 " FW_MAX_OFFSET %#010x\n",
125 offset, FW_MAX_OFFSET);
126 goto invalid_address;
127 }
128 break;
129 default:
130 dev_dbg(zd_usb_dev(usb),
131 "address has unsupported base %#010x\n", addr);
132 goto invalid_address;
133 }
134
135 return 0;
136 invalid_address:
137 dev_dbg(zd_usb_dev(usb),
138 "ERROR: invalid address: %#010x\n", addr);
139 return -EINVAL;
140 }
141 #endif /* DEBUG */
142
143 static u16 usb_addr(struct zd_usb *usb, zd_addr_t addr)
144 {
145 u32 base;
146 u16 offset;
147
148 base = ZD_ADDR_BASE(addr);
149 offset = ZD_OFFSET(addr);
150
151 ZD_ASSERT(check_addr(usb, addr) == 0);
152
153 switch (base) {
154 case CR_BASE:
155 offset += CR_START;
156 break;
157 case E2P_BASE:
158 offset += E2P_START + E2P_DATA_OFFSET;
159 break;
160 case FW_BASE:
161 offset += usb->fw_base_offset;
162 break;
163 }
164
165 return offset;
166 }
167
168 /* USB device initialization */
169
170 static int request_fw_file(
171 const struct firmware **fw, const char *name, struct device *device)
172 {
173 int r;
174
175 dev_dbg_f(device, "fw name %s\n", name);
176
177 r = request_firmware(fw, name, device);
178 if (r)
179 dev_err(device,
180 "Could not load firmware file %s. Error number %d\n",
181 name, r);
182 return r;
183 }
184
185 static inline u16 get_bcdDevice(const struct usb_device *udev)
186 {
187 return le16_to_cpu(udev->descriptor.bcdDevice);
188 }
189
190 enum upload_code_flags {
191 REBOOT = 1,
192 };
193
194 /* Ensures that MAX_TRANSFER_SIZE is even. */
195 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
196
197 static int upload_code(struct usb_device *udev,
198 const u8 *data, size_t size, u16 code_offset, int flags)
199 {
200 u8 *p;
201 int r;
202
203 /* USB request blocks need "kmalloced" buffers.
204 */
205 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
206 if (!p) {
207 dev_err(&udev->dev, "out of memory\n");
208 r = -ENOMEM;
209 goto error;
210 }
211
212 size &= ~1;
213 while (size > 0) {
214 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
215 size : MAX_TRANSFER_SIZE;
216
217 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
218
219 memcpy(p, data, transfer_size);
220 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
221 USB_REQ_FIRMWARE_DOWNLOAD,
222 USB_DIR_OUT | USB_TYPE_VENDOR,
223 code_offset, 0, p, transfer_size, 1000 /* ms */);
224 if (r < 0) {
225 dev_err(&udev->dev,
226 "USB control request for firmware upload"
227 " failed. Error number %d\n", r);
228 goto error;
229 }
230 transfer_size = r & ~1;
231
232 size -= transfer_size;
233 data += transfer_size;
234 code_offset += transfer_size/sizeof(u16);
235 }
236
237 if (flags & REBOOT) {
238 u8 ret;
239
240 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
241 USB_REQ_FIRMWARE_CONFIRM,
242 USB_DIR_IN | USB_TYPE_VENDOR,
243 0, 0, &ret, sizeof(ret), 5000 /* ms */);
244 if (r != sizeof(ret)) {
245 dev_err(&udev->dev,
246 "control request firmeware confirmation failed."
247 " Return value %d\n", r);
248 if (r >= 0)
249 r = -ENODEV;
250 goto error;
251 }
252 if (ret & 0x80) {
253 dev_err(&udev->dev,
254 "Internal error while downloading."
255 " Firmware confirm return value %#04x\n",
256 (unsigned int)ret);
257 r = -ENODEV;
258 goto error;
259 }
260 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
261 (unsigned int)ret);
262 }
263
264 r = 0;
265 error:
266 kfree(p);
267 return r;
268 }
269
270 static u16 get_word(const void *data, u16 offset)
271 {
272 const __le16 *p = data;
273 return le16_to_cpu(p[offset]);
274 }
275
276 static char *get_fw_name(char *buffer, size_t size, u8 device_type,
277 const char* postfix)
278 {
279 scnprintf(buffer, size, "%s%s",
280 device_type == DEVICE_ZD1211B ?
281 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
282 postfix);
283 return buffer;
284 }
285
286 static int handle_version_mismatch(struct usb_device *udev, u8 device_type,
287 const struct firmware *ub_fw)
288 {
289 const struct firmware *ur_fw = NULL;
290 int offset;
291 int r = 0;
292 char fw_name[128];
293
294 r = request_fw_file(&ur_fw,
295 get_fw_name(fw_name, sizeof(fw_name), device_type, "ur"),
296 &udev->dev);
297 if (r)
298 goto error;
299
300 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
301 if (r)
302 goto error;
303
304 offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
305 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
306 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
307
308 /* At this point, the vendor driver downloads the whole firmware
309 * image, hacks around with version IDs, and uploads it again,
310 * completely overwriting the boot code. We do not do this here as
311 * it is not required on any tested devices, and it is suspected to
312 * cause problems. */
313 error:
314 release_firmware(ur_fw);
315 return r;
316 }
317
318 static int upload_firmware(struct usb_device *udev, u8 device_type)
319 {
320 int r;
321 u16 fw_bcdDevice;
322 u16 bcdDevice;
323 const struct firmware *ub_fw = NULL;
324 const struct firmware *uph_fw = NULL;
325 char fw_name[128];
326
327 bcdDevice = get_bcdDevice(udev);
328
329 r = request_fw_file(&ub_fw,
330 get_fw_name(fw_name, sizeof(fw_name), device_type, "ub"),
331 &udev->dev);
332 if (r)
333 goto error;
334
335 fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
336
337 if (fw_bcdDevice != bcdDevice) {
338 dev_info(&udev->dev,
339 "firmware version %#06x and device bootcode version "
340 "%#06x differ\n", fw_bcdDevice, bcdDevice);
341 if (bcdDevice <= 0x4313)
342 dev_warn(&udev->dev, "device has old bootcode, please "
343 "report success or failure\n");
344
345 r = handle_version_mismatch(udev, device_type, ub_fw);
346 if (r)
347 goto error;
348 } else {
349 dev_dbg_f(&udev->dev,
350 "firmware device id %#06x is equal to the "
351 "actual device id\n", fw_bcdDevice);
352 }
353
354
355 r = request_fw_file(&uph_fw,
356 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
357 &udev->dev);
358 if (r)
359 goto error;
360
361 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
362 if (r) {
363 dev_err(&udev->dev,
364 "Could not upload firmware code uph. Error number %d\n",
365 r);
366 }
367
368 /* FALL-THROUGH */
369 error:
370 release_firmware(ub_fw);
371 release_firmware(uph_fw);
372 return r;
373 }
374
375 #define urb_dev(urb) (&(urb)->dev->dev)
376
377 static inline void handle_regs_int(struct urb *urb)
378 {
379 struct zd_usb *usb = urb->context;
380 struct zd_usb_interrupt *intr = &usb->intr;
381 int len;
382
383 ZD_ASSERT(in_interrupt());
384 spin_lock(&intr->lock);
385
386 if (intr->read_regs_enabled) {
387 intr->read_regs.length = len = urb->actual_length;
388
389 if (len > sizeof(intr->read_regs.buffer))
390 len = sizeof(intr->read_regs.buffer);
391 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
392 intr->read_regs_enabled = 0;
393 complete(&intr->read_regs.completion);
394 goto out;
395 }
396
397 dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
398 out:
399 spin_unlock(&intr->lock);
400 }
401
402 static inline void handle_retry_failed_int(struct urb *urb)
403 {
404 dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
405 }
406
407
408 static void int_urb_complete(struct urb *urb)
409 {
410 int r;
411 struct usb_int_header *hdr;
412
413 switch (urb->status) {
414 case 0:
415 break;
416 case -ESHUTDOWN:
417 case -EINVAL:
418 case -ENODEV:
419 case -ENOENT:
420 case -ECONNRESET:
421 case -EPIPE:
422 goto kfree;
423 default:
424 goto resubmit;
425 }
426
427 if (urb->actual_length < sizeof(hdr)) {
428 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
429 goto resubmit;
430 }
431
432 hdr = urb->transfer_buffer;
433 if (hdr->type != USB_INT_TYPE) {
434 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
435 goto resubmit;
436 }
437
438 switch (hdr->id) {
439 case USB_INT_ID_REGS:
440 handle_regs_int(urb);
441 break;
442 case USB_INT_ID_RETRY_FAILED:
443 handle_retry_failed_int(urb);
444 break;
445 default:
446 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
447 (unsigned int)hdr->id);
448 goto resubmit;
449 }
450
451 resubmit:
452 r = usb_submit_urb(urb, GFP_ATOMIC);
453 if (r) {
454 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
455 goto kfree;
456 }
457 return;
458 kfree:
459 kfree(urb->transfer_buffer);
460 }
461
462 static inline int int_urb_interval(struct usb_device *udev)
463 {
464 switch (udev->speed) {
465 case USB_SPEED_HIGH:
466 return 4;
467 case USB_SPEED_LOW:
468 return 10;
469 case USB_SPEED_FULL:
470 default:
471 return 1;
472 }
473 }
474
475 static inline int usb_int_enabled(struct zd_usb *usb)
476 {
477 unsigned long flags;
478 struct zd_usb_interrupt *intr = &usb->intr;
479 struct urb *urb;
480
481 spin_lock_irqsave(&intr->lock, flags);
482 urb = intr->urb;
483 spin_unlock_irqrestore(&intr->lock, flags);
484 return urb != NULL;
485 }
486
487 int zd_usb_enable_int(struct zd_usb *usb)
488 {
489 int r;
490 struct usb_device *udev;
491 struct zd_usb_interrupt *intr = &usb->intr;
492 void *transfer_buffer = NULL;
493 struct urb *urb;
494
495 dev_dbg_f(zd_usb_dev(usb), "\n");
496
497 urb = usb_alloc_urb(0, GFP_NOFS);
498 if (!urb) {
499 r = -ENOMEM;
500 goto out;
501 }
502
503 ZD_ASSERT(!irqs_disabled());
504 spin_lock_irq(&intr->lock);
505 if (intr->urb) {
506 spin_unlock_irq(&intr->lock);
507 r = 0;
508 goto error_free_urb;
509 }
510 intr->urb = urb;
511 spin_unlock_irq(&intr->lock);
512
513 /* TODO: make it a DMA buffer */
514 r = -ENOMEM;
515 transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_NOFS);
516 if (!transfer_buffer) {
517 dev_dbg_f(zd_usb_dev(usb),
518 "couldn't allocate transfer_buffer\n");
519 goto error_set_urb_null;
520 }
521
522 udev = zd_usb_to_usbdev(usb);
523 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
524 transfer_buffer, USB_MAX_EP_INT_BUFFER,
525 int_urb_complete, usb,
526 intr->interval);
527
528 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
529 r = usb_submit_urb(urb, GFP_NOFS);
530 if (r) {
531 dev_dbg_f(zd_usb_dev(usb),
532 "Couldn't submit urb. Error number %d\n", r);
533 goto error;
534 }
535
536 return 0;
537 error:
538 kfree(transfer_buffer);
539 error_set_urb_null:
540 spin_lock_irq(&intr->lock);
541 intr->urb = NULL;
542 spin_unlock_irq(&intr->lock);
543 error_free_urb:
544 usb_free_urb(urb);
545 out:
546 return r;
547 }
548
549 void zd_usb_disable_int(struct zd_usb *usb)
550 {
551 unsigned long flags;
552 struct zd_usb_interrupt *intr = &usb->intr;
553 struct urb *urb;
554
555 spin_lock_irqsave(&intr->lock, flags);
556 urb = intr->urb;
557 if (!urb) {
558 spin_unlock_irqrestore(&intr->lock, flags);
559 return;
560 }
561 intr->urb = NULL;
562 spin_unlock_irqrestore(&intr->lock, flags);
563
564 usb_kill_urb(urb);
565 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
566 usb_free_urb(urb);
567 }
568
569 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
570 unsigned int length)
571 {
572 int i;
573 struct zd_mac *mac = zd_usb_to_mac(usb);
574 const struct rx_length_info *length_info;
575
576 if (length < sizeof(struct rx_length_info)) {
577 /* It's not a complete packet anyhow. */
578 return;
579 }
580 length_info = (struct rx_length_info *)
581 (buffer + length - sizeof(struct rx_length_info));
582
583 /* It might be that three frames are merged into a single URB
584 * transaction. We have to check for the length info tag.
585 *
586 * While testing we discovered that length_info might be unaligned,
587 * because if USB transactions are merged, the last packet will not
588 * be padded. Unaligned access might also happen if the length_info
589 * structure is not present.
590 */
591 if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
592 {
593 unsigned int l, k, n;
594 for (i = 0, l = 0;; i++) {
595 k = le16_to_cpu(get_unaligned(&length_info->length[i]));
596 if (k == 0)
597 return;
598 n = l+k;
599 if (n > length)
600 return;
601 zd_mac_rx_irq(mac, buffer+l, k);
602 if (i >= 2)
603 return;
604 l = (n+3) & ~3;
605 }
606 } else {
607 zd_mac_rx_irq(mac, buffer, length);
608 }
609 }
610
611 static void rx_urb_complete(struct urb *urb)
612 {
613 struct zd_usb *usb;
614 struct zd_usb_rx *rx;
615 const u8 *buffer;
616 unsigned int length;
617
618 switch (urb->status) {
619 case 0:
620 break;
621 case -ESHUTDOWN:
622 case -EINVAL:
623 case -ENODEV:
624 case -ENOENT:
625 case -ECONNRESET:
626 case -EPIPE:
627 return;
628 default:
629 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
630 goto resubmit;
631 }
632
633 buffer = urb->transfer_buffer;
634 length = urb->actual_length;
635 usb = urb->context;
636 rx = &usb->rx;
637
638 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
639 /* If there is an old first fragment, we don't care. */
640 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
641 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
642 spin_lock(&rx->lock);
643 memcpy(rx->fragment, buffer, length);
644 rx->fragment_length = length;
645 spin_unlock(&rx->lock);
646 goto resubmit;
647 }
648
649 spin_lock(&rx->lock);
650 if (rx->fragment_length > 0) {
651 /* We are on a second fragment, we believe */
652 ZD_ASSERT(length + rx->fragment_length <=
653 ARRAY_SIZE(rx->fragment));
654 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
655 memcpy(rx->fragment+rx->fragment_length, buffer, length);
656 handle_rx_packet(usb, rx->fragment,
657 rx->fragment_length + length);
658 rx->fragment_length = 0;
659 spin_unlock(&rx->lock);
660 } else {
661 spin_unlock(&rx->lock);
662 handle_rx_packet(usb, buffer, length);
663 }
664
665 resubmit:
666 usb_submit_urb(urb, GFP_ATOMIC);
667 }
668
669 static struct urb *alloc_urb(struct zd_usb *usb)
670 {
671 struct usb_device *udev = zd_usb_to_usbdev(usb);
672 struct urb *urb;
673 void *buffer;
674
675 urb = usb_alloc_urb(0, GFP_NOFS);
676 if (!urb)
677 return NULL;
678 buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS,
679 &urb->transfer_dma);
680 if (!buffer) {
681 usb_free_urb(urb);
682 return NULL;
683 }
684
685 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
686 buffer, USB_MAX_RX_SIZE,
687 rx_urb_complete, usb);
688 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
689
690 return urb;
691 }
692
693 static void free_urb(struct urb *urb)
694 {
695 if (!urb)
696 return;
697 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
698 urb->transfer_buffer, urb->transfer_dma);
699 usb_free_urb(urb);
700 }
701
702 int zd_usb_enable_rx(struct zd_usb *usb)
703 {
704 int i, r;
705 struct zd_usb_rx *rx = &usb->rx;
706 struct urb **urbs;
707
708 dev_dbg_f(zd_usb_dev(usb), "\n");
709
710 r = -ENOMEM;
711 urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS);
712 if (!urbs)
713 goto error;
714 for (i = 0; i < URBS_COUNT; i++) {
715 urbs[i] = alloc_urb(usb);
716 if (!urbs[i])
717 goto error;
718 }
719
720 ZD_ASSERT(!irqs_disabled());
721 spin_lock_irq(&rx->lock);
722 if (rx->urbs) {
723 spin_unlock_irq(&rx->lock);
724 r = 0;
725 goto error;
726 }
727 rx->urbs = urbs;
728 rx->urbs_count = URBS_COUNT;
729 spin_unlock_irq(&rx->lock);
730
731 for (i = 0; i < URBS_COUNT; i++) {
732 r = usb_submit_urb(urbs[i], GFP_NOFS);
733 if (r)
734 goto error_submit;
735 }
736
737 return 0;
738 error_submit:
739 for (i = 0; i < URBS_COUNT; i++) {
740 usb_kill_urb(urbs[i]);
741 }
742 spin_lock_irq(&rx->lock);
743 rx->urbs = NULL;
744 rx->urbs_count = 0;
745 spin_unlock_irq(&rx->lock);
746 error:
747 if (urbs) {
748 for (i = 0; i < URBS_COUNT; i++)
749 free_urb(urbs[i]);
750 }
751 return r;
752 }
753
754 void zd_usb_disable_rx(struct zd_usb *usb)
755 {
756 int i;
757 unsigned long flags;
758 struct urb **urbs;
759 unsigned int count;
760 struct zd_usb_rx *rx = &usb->rx;
761
762 spin_lock_irqsave(&rx->lock, flags);
763 urbs = rx->urbs;
764 count = rx->urbs_count;
765 spin_unlock_irqrestore(&rx->lock, flags);
766 if (!urbs)
767 return;
768
769 for (i = 0; i < count; i++) {
770 usb_kill_urb(urbs[i]);
771 free_urb(urbs[i]);
772 }
773 kfree(urbs);
774
775 spin_lock_irqsave(&rx->lock, flags);
776 rx->urbs = NULL;
777 rx->urbs_count = 0;
778 spin_unlock_irqrestore(&rx->lock, flags);
779 }
780
781 static void tx_urb_complete(struct urb *urb)
782 {
783 int r;
784
785 switch (urb->status) {
786 case 0:
787 break;
788 case -ESHUTDOWN:
789 case -EINVAL:
790 case -ENODEV:
791 case -ENOENT:
792 case -ECONNRESET:
793 case -EPIPE:
794 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
795 break;
796 default:
797 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
798 goto resubmit;
799 }
800 free_urb:
801 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
802 urb->transfer_buffer, urb->transfer_dma);
803 usb_free_urb(urb);
804 return;
805 resubmit:
806 r = usb_submit_urb(urb, GFP_ATOMIC);
807 if (r) {
808 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
809 goto free_urb;
810 }
811 }
812
813 /* Puts the frame on the USB endpoint. It doesn't wait for
814 * completion. The frame must contain the control set.
815 */
816 int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
817 {
818 int r;
819 struct usb_device *udev = zd_usb_to_usbdev(usb);
820 struct urb *urb;
821 void *buffer;
822
823 urb = usb_alloc_urb(0, GFP_ATOMIC);
824 if (!urb) {
825 r = -ENOMEM;
826 goto out;
827 }
828
829 buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
830 &urb->transfer_dma);
831 if (!buffer) {
832 r = -ENOMEM;
833 goto error_free_urb;
834 }
835 memcpy(buffer, frame, length);
836
837 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
838 buffer, length, tx_urb_complete, NULL);
839 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
840
841 r = usb_submit_urb(urb, GFP_ATOMIC);
842 if (r)
843 goto error;
844 return 0;
845 error:
846 usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
847 urb->transfer_dma);
848 error_free_urb:
849 usb_free_urb(urb);
850 out:
851 return r;
852 }
853
854 static inline void init_usb_interrupt(struct zd_usb *usb)
855 {
856 struct zd_usb_interrupt *intr = &usb->intr;
857
858 spin_lock_init(&intr->lock);
859 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
860 init_completion(&intr->read_regs.completion);
861 intr->read_regs.cr_int_addr = cpu_to_le16(usb_addr(usb, CR_INTERRUPT));
862 }
863
864 static inline void init_usb_rx(struct zd_usb *usb)
865 {
866 struct zd_usb_rx *rx = &usb->rx;
867 spin_lock_init(&rx->lock);
868 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
869 rx->usb_packet_size = 512;
870 } else {
871 rx->usb_packet_size = 64;
872 }
873 ZD_ASSERT(rx->fragment_length == 0);
874 }
875
876 static inline void init_usb_tx(struct zd_usb *usb)
877 {
878 /* FIXME: at this point we will allocate a fixed number of urb's for
879 * use in a cyclic scheme */
880 }
881
882 void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
883 struct usb_interface *intf)
884 {
885 memset(usb, 0, sizeof(*usb));
886 usb->intf = usb_get_intf(intf);
887 usb_set_intfdata(usb->intf, netdev);
888 init_usb_interrupt(usb);
889 init_usb_tx(usb);
890 init_usb_rx(usb);
891 }
892
893 int zd_usb_init_hw(struct zd_usb *usb)
894 {
895 int r;
896 struct zd_chip *chip = zd_usb_to_chip(usb);
897
898 ZD_ASSERT(mutex_is_locked(&chip->mutex));
899 r = zd_ioread16_locked(chip, &usb->fw_base_offset,
900 USB_REG(FW_START + FW_REGS_ADDR_OFFSET));
901 if (r)
902 return r;
903 dev_dbg_f(zd_usb_dev(usb), "fw_base_offset: %#06hx\n",
904 usb->fw_base_offset);
905
906 return 0;
907 }
908
909 void zd_usb_clear(struct zd_usb *usb)
910 {
911 usb_set_intfdata(usb->intf, NULL);
912 usb_put_intf(usb->intf);
913 ZD_MEMCLEAR(usb, sizeof(*usb));
914 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
915 }
916
917 static const char *speed(enum usb_device_speed speed)
918 {
919 switch (speed) {
920 case USB_SPEED_LOW:
921 return "low";
922 case USB_SPEED_FULL:
923 return "full";
924 case USB_SPEED_HIGH:
925 return "high";
926 default:
927 return "unknown speed";
928 }
929 }
930
931 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
932 {
933 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
934 le16_to_cpu(udev->descriptor.idVendor),
935 le16_to_cpu(udev->descriptor.idProduct),
936 get_bcdDevice(udev),
937 speed(udev->speed));
938 }
939
940 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
941 {
942 struct usb_device *udev = interface_to_usbdev(usb->intf);
943 return scnprint_id(udev, buffer, size);
944 }
945
946 #ifdef DEBUG
947 static void print_id(struct usb_device *udev)
948 {
949 char buffer[40];
950
951 scnprint_id(udev, buffer, sizeof(buffer));
952 buffer[sizeof(buffer)-1] = 0;
953 dev_dbg_f(&udev->dev, "%s\n", buffer);
954 }
955 #else
956 #define print_id(udev) do { } while (0)
957 #endif
958
959 static int eject_installer(struct usb_interface *intf)
960 {
961 struct usb_device *udev = interface_to_usbdev(intf);
962 struct usb_host_interface *iface_desc = &intf->altsetting[0];
963 struct usb_endpoint_descriptor *endpoint;
964 unsigned char *cmd;
965 u8 bulk_out_ep;
966 int r;
967
968 /* Find bulk out endpoint */
969 endpoint = &iface_desc->endpoint[1].desc;
970 if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
971 (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
972 USB_ENDPOINT_XFER_BULK) {
973 bulk_out_ep = endpoint->bEndpointAddress;
974 } else {
975 dev_err(&udev->dev,
976 "zd1211rw: Could not find bulk out endpoint\n");
977 return -ENODEV;
978 }
979
980 cmd = kzalloc(31, GFP_KERNEL);
981 if (cmd == NULL)
982 return -ENODEV;
983
984 /* USB bulk command block */
985 cmd[0] = 0x55; /* bulk command signature */
986 cmd[1] = 0x53; /* bulk command signature */
987 cmd[2] = 0x42; /* bulk command signature */
988 cmd[3] = 0x43; /* bulk command signature */
989 cmd[14] = 6; /* command length */
990
991 cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
992 cmd[19] = 0x2; /* eject disc */
993
994 dev_info(&udev->dev, "Ejecting virtual installer media...\n");
995 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
996 cmd, 31, NULL, 2000);
997 kfree(cmd);
998 if (r)
999 return r;
1000
1001 /* At this point, the device disconnects and reconnects with the real
1002 * ID numbers. */
1003
1004 usb_set_intfdata(intf, NULL);
1005 return 0;
1006 }
1007
1008 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1009 {
1010 int r;
1011 struct usb_device *udev = interface_to_usbdev(intf);
1012 struct net_device *netdev = NULL;
1013
1014 print_id(udev);
1015
1016 if (id->driver_info & DEVICE_INSTALLER)
1017 return eject_installer(intf);
1018
1019 switch (udev->speed) {
1020 case USB_SPEED_LOW:
1021 case USB_SPEED_FULL:
1022 case USB_SPEED_HIGH:
1023 break;
1024 default:
1025 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1026 r = -ENODEV;
1027 goto error;
1028 }
1029
1030 netdev = zd_netdev_alloc(intf);
1031 if (netdev == NULL) {
1032 r = -ENOMEM;
1033 goto error;
1034 }
1035
1036 r = upload_firmware(udev, id->driver_info);
1037 if (r) {
1038 dev_err(&intf->dev,
1039 "couldn't load firmware. Error number %d\n", r);
1040 goto error;
1041 }
1042
1043 r = usb_reset_configuration(udev);
1044 if (r) {
1045 dev_dbg_f(&intf->dev,
1046 "couldn't reset configuration. Error number %d\n", r);
1047 goto error;
1048 }
1049
1050 /* At this point the interrupt endpoint is not generally enabled. We
1051 * save the USB bandwidth until the network device is opened. But
1052 * notify that the initialization of the MAC will require the
1053 * interrupts to be temporary enabled.
1054 */
1055 r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
1056 if (r) {
1057 dev_dbg_f(&intf->dev,
1058 "couldn't initialize mac. Error number %d\n", r);
1059 goto error;
1060 }
1061
1062 r = register_netdev(netdev);
1063 if (r) {
1064 dev_dbg_f(&intf->dev,
1065 "couldn't register netdev. Error number %d\n", r);
1066 goto error;
1067 }
1068
1069 dev_dbg_f(&intf->dev, "successful\n");
1070 dev_info(&intf->dev,"%s\n", netdev->name);
1071 return 0;
1072 error:
1073 usb_reset_device(interface_to_usbdev(intf));
1074 zd_netdev_free(netdev);
1075 return r;
1076 }
1077
1078 static void disconnect(struct usb_interface *intf)
1079 {
1080 struct net_device *netdev = zd_intf_to_netdev(intf);
1081 struct zd_mac *mac = zd_netdev_mac(netdev);
1082 struct zd_usb *usb = &mac->chip.usb;
1083
1084 /* Either something really bad happened, or we're just dealing with
1085 * a DEVICE_INSTALLER. */
1086 if (netdev == NULL)
1087 return;
1088
1089 dev_dbg_f(zd_usb_dev(usb), "\n");
1090
1091 zd_netdev_disconnect(netdev);
1092
1093 /* Just in case something has gone wrong! */
1094 zd_usb_disable_rx(usb);
1095 zd_usb_disable_int(usb);
1096
1097 /* If the disconnect has been caused by a removal of the
1098 * driver module, the reset allows reloading of the driver. If the
1099 * reset will not be executed here, the upload of the firmware in the
1100 * probe function caused by the reloading of the driver will fail.
1101 */
1102 usb_reset_device(interface_to_usbdev(intf));
1103
1104 zd_netdev_free(netdev);
1105 dev_dbg(&intf->dev, "disconnected\n");
1106 }
1107
1108 static struct usb_driver driver = {
1109 .name = "zd1211rw",
1110 .id_table = usb_ids,
1111 .probe = probe,
1112 .disconnect = disconnect,
1113 };
1114
1115 struct workqueue_struct *zd_workqueue;
1116
1117 static int __init usb_init(void)
1118 {
1119 int r;
1120
1121 pr_debug("%s usb_init()\n", driver.name);
1122
1123 zd_workqueue = create_singlethread_workqueue(driver.name);
1124 if (zd_workqueue == NULL) {
1125 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1126 return -ENOMEM;
1127 }
1128
1129 r = usb_register(&driver);
1130 if (r) {
1131 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1132 driver.name, r);
1133 return r;
1134 }
1135
1136 pr_debug("%s initialized\n", driver.name);
1137 return 0;
1138 }
1139
1140 static void __exit usb_exit(void)
1141 {
1142 pr_debug("%s usb_exit()\n", driver.name);
1143 usb_deregister(&driver);
1144 destroy_workqueue(zd_workqueue);
1145 }
1146
1147 module_init(usb_init);
1148 module_exit(usb_exit);
1149
1150 static int usb_int_regs_length(unsigned int count)
1151 {
1152 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1153 }
1154
1155 static void prepare_read_regs_int(struct zd_usb *usb)
1156 {
1157 struct zd_usb_interrupt *intr = &usb->intr;
1158
1159 spin_lock_irq(&intr->lock);
1160 intr->read_regs_enabled = 1;
1161 INIT_COMPLETION(intr->read_regs.completion);
1162 spin_unlock_irq(&intr->lock);
1163 }
1164
1165 static void disable_read_regs_int(struct zd_usb *usb)
1166 {
1167 struct zd_usb_interrupt *intr = &usb->intr;
1168
1169 spin_lock_irq(&intr->lock);
1170 intr->read_regs_enabled = 0;
1171 spin_unlock_irq(&intr->lock);
1172 }
1173
1174 static int get_results(struct zd_usb *usb, u16 *values,
1175 struct usb_req_read_regs *req, unsigned int count)
1176 {
1177 int r;
1178 int i;
1179 struct zd_usb_interrupt *intr = &usb->intr;
1180 struct read_regs_int *rr = &intr->read_regs;
1181 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1182
1183 spin_lock_irq(&intr->lock);
1184
1185 r = -EIO;
1186 /* The created block size seems to be larger than expected.
1187 * However results appear to be correct.
1188 */
1189 if (rr->length < usb_int_regs_length(count)) {
1190 dev_dbg_f(zd_usb_dev(usb),
1191 "error: actual length %d less than expected %d\n",
1192 rr->length, usb_int_regs_length(count));
1193 goto error_unlock;
1194 }
1195 if (rr->length > sizeof(rr->buffer)) {
1196 dev_dbg_f(zd_usb_dev(usb),
1197 "error: actual length %d exceeds buffer size %zu\n",
1198 rr->length, sizeof(rr->buffer));
1199 goto error_unlock;
1200 }
1201
1202 for (i = 0; i < count; i++) {
1203 struct reg_data *rd = &regs->regs[i];
1204 if (rd->addr != req->addr[i]) {
1205 dev_dbg_f(zd_usb_dev(usb),
1206 "rd[%d] addr %#06hx expected %#06hx\n", i,
1207 le16_to_cpu(rd->addr),
1208 le16_to_cpu(req->addr[i]));
1209 goto error_unlock;
1210 }
1211 values[i] = le16_to_cpu(rd->value);
1212 }
1213
1214 r = 0;
1215 error_unlock:
1216 spin_unlock_irq(&intr->lock);
1217 return r;
1218 }
1219
1220 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1221 const zd_addr_t *addresses, unsigned int count)
1222 {
1223 int r;
1224 int i, req_len, actual_req_len;
1225 struct usb_device *udev;
1226 struct usb_req_read_regs *req = NULL;
1227 unsigned long timeout;
1228
1229 if (count < 1) {
1230 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1231 return -EINVAL;
1232 }
1233 if (count > USB_MAX_IOREAD16_COUNT) {
1234 dev_dbg_f(zd_usb_dev(usb),
1235 "error: count %u exceeds possible max %u\n",
1236 count, USB_MAX_IOREAD16_COUNT);
1237 return -EINVAL;
1238 }
1239 if (in_atomic()) {
1240 dev_dbg_f(zd_usb_dev(usb),
1241 "error: io in atomic context not supported\n");
1242 return -EWOULDBLOCK;
1243 }
1244 if (!usb_int_enabled(usb)) {
1245 dev_dbg_f(zd_usb_dev(usb),
1246 "error: usb interrupt not enabled\n");
1247 return -EWOULDBLOCK;
1248 }
1249
1250 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1251 req = kmalloc(req_len, GFP_NOFS);
1252 if (!req)
1253 return -ENOMEM;
1254 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1255 for (i = 0; i < count; i++)
1256 req->addr[i] = cpu_to_le16(usb_addr(usb, addresses[i]));
1257
1258 udev = zd_usb_to_usbdev(usb);
1259 prepare_read_regs_int(usb);
1260 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1261 req, req_len, &actual_req_len, 1000 /* ms */);
1262 if (r) {
1263 dev_dbg_f(zd_usb_dev(usb),
1264 "error in usb_bulk_msg(). Error number %d\n", r);
1265 goto error;
1266 }
1267 if (req_len != actual_req_len) {
1268 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1269 " req_len %d != actual_req_len %d\n",
1270 req_len, actual_req_len);
1271 r = -EIO;
1272 goto error;
1273 }
1274
1275 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1276 msecs_to_jiffies(1000));
1277 if (!timeout) {
1278 disable_read_regs_int(usb);
1279 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1280 r = -ETIMEDOUT;
1281 goto error;
1282 }
1283
1284 r = get_results(usb, values, req, count);
1285 error:
1286 kfree(req);
1287 return r;
1288 }
1289
1290 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1291 unsigned int count)
1292 {
1293 int r;
1294 struct usb_device *udev;
1295 struct usb_req_write_regs *req = NULL;
1296 int i, req_len, actual_req_len;
1297
1298 if (count == 0)
1299 return 0;
1300 if (count > USB_MAX_IOWRITE16_COUNT) {
1301 dev_dbg_f(zd_usb_dev(usb),
1302 "error: count %u exceeds possible max %u\n",
1303 count, USB_MAX_IOWRITE16_COUNT);
1304 return -EINVAL;
1305 }
1306 if (in_atomic()) {
1307 dev_dbg_f(zd_usb_dev(usb),
1308 "error: io in atomic context not supported\n");
1309 return -EWOULDBLOCK;
1310 }
1311
1312 req_len = sizeof(struct usb_req_write_regs) +
1313 count * sizeof(struct reg_data);
1314 req = kmalloc(req_len, GFP_NOFS);
1315 if (!req)
1316 return -ENOMEM;
1317
1318 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1319 for (i = 0; i < count; i++) {
1320 struct reg_data *rw = &req->reg_writes[i];
1321 rw->addr = cpu_to_le16(usb_addr(usb, ioreqs[i].addr));
1322 rw->value = cpu_to_le16(ioreqs[i].value);
1323 }
1324
1325 udev = zd_usb_to_usbdev(usb);
1326 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1327 req, req_len, &actual_req_len, 1000 /* ms */);
1328 if (r) {
1329 dev_dbg_f(zd_usb_dev(usb),
1330 "error in usb_bulk_msg(). Error number %d\n", r);
1331 goto error;
1332 }
1333 if (req_len != actual_req_len) {
1334 dev_dbg_f(zd_usb_dev(usb),
1335 "error in usb_bulk_msg()"
1336 " req_len %d != actual_req_len %d\n",
1337 req_len, actual_req_len);
1338 r = -EIO;
1339 goto error;
1340 }
1341
1342 /* FALL-THROUGH with r == 0 */
1343 error:
1344 kfree(req);
1345 return r;
1346 }
1347
1348 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1349 {
1350 int r;
1351 struct usb_device *udev;
1352 struct usb_req_rfwrite *req = NULL;
1353 int i, req_len, actual_req_len;
1354 u16 bit_value_template;
1355
1356 if (in_atomic()) {
1357 dev_dbg_f(zd_usb_dev(usb),
1358 "error: io in atomic context not supported\n");
1359 return -EWOULDBLOCK;
1360 }
1361 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1362 dev_dbg_f(zd_usb_dev(usb),
1363 "error: bits %d are smaller than"
1364 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1365 bits, USB_MIN_RFWRITE_BIT_COUNT);
1366 return -EINVAL;
1367 }
1368 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1369 dev_dbg_f(zd_usb_dev(usb),
1370 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1371 bits, USB_MAX_RFWRITE_BIT_COUNT);
1372 return -EINVAL;
1373 }
1374 #ifdef DEBUG
1375 if (value & (~0UL << bits)) {
1376 dev_dbg_f(zd_usb_dev(usb),
1377 "error: value %#09x has bits >= %d set\n",
1378 value, bits);
1379 return -EINVAL;
1380 }
1381 #endif /* DEBUG */
1382
1383 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1384
1385 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1386 if (r) {
1387 dev_dbg_f(zd_usb_dev(usb),
1388 "error %d: Couldn't read CR203\n", r);
1389 goto out;
1390 }
1391 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1392
1393 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1394 req = kmalloc(req_len, GFP_NOFS);
1395 if (!req)
1396 return -ENOMEM;
1397
1398 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1399 /* 1: 3683a, but not used in ZYDAS driver */
1400 req->value = cpu_to_le16(2);
1401 req->bits = cpu_to_le16(bits);
1402
1403 for (i = 0; i < bits; i++) {
1404 u16 bv = bit_value_template;
1405 if (value & (1 << (bits-1-i)))
1406 bv |= RF_DATA;
1407 req->bit_values[i] = cpu_to_le16(bv);
1408 }
1409
1410 udev = zd_usb_to_usbdev(usb);
1411 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1412 req, req_len, &actual_req_len, 1000 /* ms */);
1413 if (r) {
1414 dev_dbg_f(zd_usb_dev(usb),
1415 "error in usb_bulk_msg(). Error number %d\n", r);
1416 goto out;
1417 }
1418 if (req_len != actual_req_len) {
1419 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1420 " req_len %d != actual_req_len %d\n",
1421 req_len, actual_req_len);
1422 r = -EIO;
1423 goto out;
1424 }
1425
1426 /* FALL-THROUGH with r == 0 */
1427 out:
1428 kfree(req);
1429 return r;
1430 }
Linux kernel - Deliverables
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