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[PATCH] zd1211rw: Don't handle broken frames in monitor mode
[mirror_ubuntu-zesty-kernel.git] / drivers / net / wireless / zd1211rw / zd_usb.c
CommitLineData
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>
d066c219 19#include <linux/kernel.h>
e85d0918
DD		 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>
bc5f06a8 27#include <linux/workqueue.h>
e85d0918
DD		 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
36static 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 },
dd2f5538 44 { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
1b865491 45 { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
12f39308 46 { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
4ceb7e99 47 { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
fca2714f 48 { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
fc3e39be 49 { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
f2423723
DD		 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 },
a362bf57 53 { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
229782a3 54 { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
e85d0918
DD		 55 /* ZD1211B */
56 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
57 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
dd2f5538 58 { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
943599ee 59 { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
8e87295b 60 { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
a2bdcc67
DD		 61 { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
62 { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
33218ba1 63 { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
2e9b2467 64 { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
aec91028
DD		 65 { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
66 { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
c445a31c 67 { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
a1030e92
DD		 68 /* "Driverless" devices that need ejecting */
69 { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
e85d0918
DD		 70 {}
71};
72
73MODULE_LICENSE("GPL");
74MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
75MODULE_AUTHOR("Ulrich Kunitz");
76MODULE_AUTHOR("Daniel Drake");
77MODULE_VERSION("1.0");
78MODULE_DEVICE_TABLE(usb, usb_ids);
79
80#define FW_ZD1211_PREFIX "zd1211/zd1211_"
81#define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
82
e85d0918
DD		 83/* USB device initialization */
84
85static int request_fw_file(
86 const struct firmware **fw, const char *name, struct device *device)
87{
88 int r;
89
90 dev_dbg_f(device, "fw name %s\n", name);
91
92 r = request_firmware(fw, name, device);
93 if (r)
94 dev_err(device,
95 "Could not load firmware file %s. Error number %d\n",
96 name, r);
97 return r;
98}
99
100static inline u16 get_bcdDevice(const struct usb_device *udev)
101{
102 return le16_to_cpu(udev->descriptor.bcdDevice);
103}
104
105enum upload_code_flags {
106 REBOOT = 1,
107};
108
109/* Ensures that MAX_TRANSFER_SIZE is even. */
110#define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
111
112static int upload_code(struct usb_device *udev,
113 const u8 *data, size_t size, u16 code_offset, int flags)
114{
115 u8 *p;
116 int r;
117
118 /* USB request blocks need "kmalloced" buffers.
119 */
120 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
121 if (!p) {
122 dev_err(&udev->dev, "out of memory\n");
123 r = -ENOMEM;
124 goto error;
125 }
126
127 size &= ~1;
128 while (size > 0) {
129 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
130 size : MAX_TRANSFER_SIZE;
131
132 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
133
134 memcpy(p, data, transfer_size);
135 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
136 USB_REQ_FIRMWARE_DOWNLOAD,
137 USB_DIR_OUT | USB_TYPE_VENDOR,
138 code_offset, 0, p, transfer_size, 1000 /* ms */);
139 if (r < 0) {
140 dev_err(&udev->dev,
141 "USB control request for firmware upload"
142 " failed. Error number %d\n", r);
143 goto error;
144 }
145 transfer_size = r & ~1;
146
147 size -= transfer_size;
148 data += transfer_size;
149 code_offset += transfer_size/sizeof(u16);
150 }
151
152 if (flags & REBOOT) {
153 u8 ret;
154
155 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
156 USB_REQ_FIRMWARE_CONFIRM,
157 USB_DIR_IN | USB_TYPE_VENDOR,
158 0, 0, &ret, sizeof(ret), 5000 /* ms */);
159 if (r != sizeof(ret)) {
160 dev_err(&udev->dev,
161 "control request firmeware confirmation failed."
162 " Return value %d\n", r);
163 if (r >= 0)
164 r = -ENODEV;
165 goto error;
166 }
167 if (ret & 0x80) {
168 dev_err(&udev->dev,
169 "Internal error while downloading."
170 " Firmware confirm return value %#04x\n",
171 (unsigned int)ret);
172 r = -ENODEV;
173 goto error;
174 }
175 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
176 (unsigned int)ret);
177 }
178
179 r = 0;
180error:
181 kfree(p);
182 return r;
183}
184
185static u16 get_word(const void *data, u16 offset)
186{
187 const __le16 *p = data;
188 return le16_to_cpu(p[offset]);
189}
190
191static char *get_fw_name(char *buffer, size_t size, u8 device_type,
192 const char* postfix)
193{
194 scnprintf(buffer, size, "%s%s",
195 device_type == DEVICE_ZD1211B ?
196 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
197 postfix);
198 return buffer;
199}
200
d066c219
DD		 201static int handle_version_mismatch(struct usb_device *udev, u8 device_type,
202 const struct firmware *ub_fw)
203{
204 const struct firmware *ur_fw = NULL;
205 int offset;
206 int r = 0;
207 char fw_name[128];
208
209 r = request_fw_file(&ur_fw,
210 get_fw_name(fw_name, sizeof(fw_name), device_type, "ur"),
211 &udev->dev);
212 if (r)
213 goto error;
214
ee302767 215 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
d066c219
DD		 216 if (r)
217 goto error;
218
ee302767 219 offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
d066c219 220 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
ee302767 221 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
d066c219
DD		 222
223 /* At this point, the vendor driver downloads the whole firmware
224 * image, hacks around with version IDs, and uploads it again,
225 * completely overwriting the boot code. We do not do this here as
226 * it is not required on any tested devices, and it is suspected to
227 * cause problems. */
228error:
229 release_firmware(ur_fw);
230 return r;
231}
232
e85d0918
DD		 233static int upload_firmware(struct usb_device *udev, u8 device_type)
234{
235 int r;
236 u16 fw_bcdDevice;
237 u16 bcdDevice;
238 const struct firmware *ub_fw = NULL;
239 const struct firmware *uph_fw = NULL;
240 char fw_name[128];
241
242 bcdDevice = get_bcdDevice(udev);
243
244 r = request_fw_file(&ub_fw,
245 get_fw_name(fw_name, sizeof(fw_name), device_type, "ub"),
246 &udev->dev);
247 if (r)
248 goto error;
249
ee302767 250 fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
e85d0918 251
e85d0918
DD		 252 if (fw_bcdDevice != bcdDevice) {
253 dev_info(&udev->dev,
d066c219
DD		 254 "firmware version %#06x and device bootcode version "
255 "%#06x differ\n", fw_bcdDevice, bcdDevice);
256 if (bcdDevice <= 0x4313)
257 dev_warn(&udev->dev, "device has old bootcode, please "
258 "report success or failure\n");
259
260 r = handle_version_mismatch(udev, device_type, ub_fw);
261 if (r)
262 goto error;
e85d0918
DD		 263 } else {
264 dev_dbg_f(&udev->dev,
265 "firmware device id %#06x is equal to the "
266 "actual device id\n", fw_bcdDevice);
267 }
268
269
270 r = request_fw_file(&uph_fw,
271 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
272 &udev->dev);
273 if (r)
274 goto error;
275
ee302767 276 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
e85d0918
DD		 277 if (r) {
278 dev_err(&udev->dev,
279 "Could not upload firmware code uph. Error number %d\n",
280 r);
281 }
282
283 /* FALL-THROUGH */
284error:
285 release_firmware(ub_fw);
286 release_firmware(uph_fw);
287 return r;
288}
289
e85d0918
DD		 290#define urb_dev(urb) (&(urb)->dev->dev)
291
292static inline void handle_regs_int(struct urb *urb)
293{
294 struct zd_usb *usb = urb->context;
295 struct zd_usb_interrupt *intr = &usb->intr;
296 int len;
297
298 ZD_ASSERT(in_interrupt());
299 spin_lock(&intr->lock);
300
301 if (intr->read_regs_enabled) {
302 intr->read_regs.length = len = urb->actual_length;
303
304 if (len > sizeof(intr->read_regs.buffer))
305 len = sizeof(intr->read_regs.buffer);
306 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
307 intr->read_regs_enabled = 0;
308 complete(&intr->read_regs.completion);
309 goto out;
310 }
311
312 dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
313out:
314 spin_unlock(&intr->lock);
315}
316
317static inline void handle_retry_failed_int(struct urb *urb)
318{
22d3405f
UK		 319 struct zd_usb *usb = urb->context;
320 struct zd_mac *mac = zd_usb_to_mac(usb);
321 struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
322
323 ieee->stats.tx_errors++;
324 ieee->ieee_stats.tx_retry_limit_exceeded++;
e85d0918
DD		 325 dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
326}
327
328
7d12e780 329static void int_urb_complete(struct urb *urb)
e85d0918
DD		 330{
331 int r;
332 struct usb_int_header *hdr;
333
334 switch (urb->status) {
335 case 0:
336 break;
337 case -ESHUTDOWN:
338 case -EINVAL:
339 case -ENODEV:
340 case -ENOENT:
341 case -ECONNRESET:
e85d0918 342 case -EPIPE:
b312d799 343 goto kfree;
e85d0918
DD		 344 default:
345 goto resubmit;
346 }
347
348 if (urb->actual_length < sizeof(hdr)) {
349 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
350 goto resubmit;
351 }
352
353 hdr = urb->transfer_buffer;
354 if (hdr->type != USB_INT_TYPE) {
355 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
356 goto resubmit;
357 }
358
359 switch (hdr->id) {
360 case USB_INT_ID_REGS:
361 handle_regs_int(urb);
362 break;
363 case USB_INT_ID_RETRY_FAILED:
364 handle_retry_failed_int(urb);
365 break;
366 default:
367 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
368 (unsigned int)hdr->id);
369 goto resubmit;
370 }
371
372resubmit:
373 r = usb_submit_urb(urb, GFP_ATOMIC);
374 if (r) {
375 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
376 goto kfree;
377 }
378 return;
379kfree:
380 kfree(urb->transfer_buffer);
381}
382
383static inline int int_urb_interval(struct usb_device *udev)
384{
385 switch (udev->speed) {
386 case USB_SPEED_HIGH:
387 return 4;
388 case USB_SPEED_LOW:
389 return 10;
390 case USB_SPEED_FULL:
391 default:
392 return 1;
393 }
394}
395
396static inline int usb_int_enabled(struct zd_usb *usb)
397{
398 unsigned long flags;
399 struct zd_usb_interrupt *intr = &usb->intr;
400 struct urb *urb;
401
402 spin_lock_irqsave(&intr->lock, flags);
403 urb = intr->urb;
404 spin_unlock_irqrestore(&intr->lock, flags);
405 return urb != NULL;
406}
407
408int zd_usb_enable_int(struct zd_usb *usb)
409{
410 int r;
411 struct usb_device *udev;
412 struct zd_usb_interrupt *intr = &usb->intr;
413 void *transfer_buffer = NULL;
414 struct urb *urb;
415
416 dev_dbg_f(zd_usb_dev(usb), "\n");
417
35c3404e 418 urb = usb_alloc_urb(0, GFP_KERNEL);
e85d0918
DD		 419 if (!urb) {
420 r = -ENOMEM;
421 goto out;
422 }
423
424 ZD_ASSERT(!irqs_disabled());
425 spin_lock_irq(&intr->lock);
426 if (intr->urb) {
427 spin_unlock_irq(&intr->lock);
428 r = 0;
429 goto error_free_urb;
430 }
431 intr->urb = urb;
432 spin_unlock_irq(&intr->lock);
433
434 /* TODO: make it a DMA buffer */
435 r = -ENOMEM;
35c3404e 436 transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
e85d0918
DD		 437 if (!transfer_buffer) {
438 dev_dbg_f(zd_usb_dev(usb),
439 "couldn't allocate transfer_buffer\n");
440 goto error_set_urb_null;
441 }
442
443 udev = zd_usb_to_usbdev(usb);
444 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
445 transfer_buffer, USB_MAX_EP_INT_BUFFER,
446 int_urb_complete, usb,
447 intr->interval);
448
449 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
35c3404e 450 r = usb_submit_urb(urb, GFP_KERNEL);
e85d0918
DD		 451 if (r) {
452 dev_dbg_f(zd_usb_dev(usb),
453 "Couldn't submit urb. Error number %d\n", r);
454 goto error;
455 }
456
457 return 0;
458error:
459 kfree(transfer_buffer);
460error_set_urb_null:
461 spin_lock_irq(&intr->lock);
462 intr->urb = NULL;
463 spin_unlock_irq(&intr->lock);
464error_free_urb:
465 usb_free_urb(urb);
466out:
467 return r;
468}
469
470void zd_usb_disable_int(struct zd_usb *usb)
471{
472 unsigned long flags;
473 struct zd_usb_interrupt *intr = &usb->intr;
474 struct urb *urb;
475
476 spin_lock_irqsave(&intr->lock, flags);
477 urb = intr->urb;
478 if (!urb) {
479 spin_unlock_irqrestore(&intr->lock, flags);
480 return;
481 }
482 intr->urb = NULL;
483 spin_unlock_irqrestore(&intr->lock, flags);
484
485 usb_kill_urb(urb);
486 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
487 usb_free_urb(urb);
488}
489
490static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
491 unsigned int length)
492{
493 int i;
494 struct zd_mac *mac = zd_usb_to_mac(usb);
495 const struct rx_length_info *length_info;
496
497 if (length < sizeof(struct rx_length_info)) {
498 /* It's not a complete packet anyhow. */
22d3405f
UK		 499 struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
500 ieee->stats.rx_errors++;
501 ieee->stats.rx_length_errors++;
e85d0918
DD		 502 return;
503 }
504 length_info = (struct rx_length_info *)
505 (buffer + length - sizeof(struct rx_length_info));
506
507 /* It might be that three frames are merged into a single URB
508 * transaction. We have to check for the length info tag.
509 *
510 * While testing we discovered that length_info might be unaligned,
511 * because if USB transactions are merged, the last packet will not
512 * be padded. Unaligned access might also happen if the length_info
513 * structure is not present.
514 */
b269825b
UK		 515 if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
516 {
e85d0918
DD		 517 unsigned int l, k, n;
518 for (i = 0, l = 0;; i++) {
b269825b 519 k = le16_to_cpu(get_unaligned(&length_info->length[i]));
850c211c
UK		 520 if (k == 0)
521 return;
e85d0918
DD		 522 n = l+k;
523 if (n > length)
524 return;
4d1feabc 525 zd_mac_rx_irq(mac, buffer+l, k);
e85d0918
DD		 526 if (i >= 2)
527 return;
528 l = (n+3) & ~3;
529 }
530 } else {
4d1feabc 531 zd_mac_rx_irq(mac, buffer, length);
e85d0918
DD		 532 }
533}
534
7d12e780 535static void rx_urb_complete(struct urb *urb)
e85d0918
DD		 536{
537 struct zd_usb *usb;
538 struct zd_usb_rx *rx;
539 const u8 *buffer;
540 unsigned int length;
541
542 switch (urb->status) {
543 case 0:
544 break;
545 case -ESHUTDOWN:
546 case -EINVAL:
547 case -ENODEV:
548 case -ENOENT:
549 case -ECONNRESET:
e85d0918 550 case -EPIPE:
b312d799 551 return;
e85d0918
DD		 552 default:
553 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
554 goto resubmit;
555 }
556
557 buffer = urb->transfer_buffer;
558 length = urb->actual_length;
559 usb = urb->context;
560 rx = &usb->rx;
561
562 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
563 /* If there is an old first fragment, we don't care. */
564 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
565 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
566 spin_lock(&rx->lock);
567 memcpy(rx->fragment, buffer, length);
568 rx->fragment_length = length;
569 spin_unlock(&rx->lock);
570 goto resubmit;
571 }
572
573 spin_lock(&rx->lock);
574 if (rx->fragment_length > 0) {
575 /* We are on a second fragment, we believe */
576 ZD_ASSERT(length + rx->fragment_length <=
577 ARRAY_SIZE(rx->fragment));
578 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
579 memcpy(rx->fragment+rx->fragment_length, buffer, length);
580 handle_rx_packet(usb, rx->fragment,
581 rx->fragment_length + length);
582 rx->fragment_length = 0;
583 spin_unlock(&rx->lock);
584 } else {
585 spin_unlock(&rx->lock);
586 handle_rx_packet(usb, buffer, length);
587 }
588
589resubmit:
590 usb_submit_urb(urb, GFP_ATOMIC);
591}
592
c48cf125 593static struct urb *alloc_urb(struct zd_usb *usb)
e85d0918
DD		 594{
595 struct usb_device *udev = zd_usb_to_usbdev(usb);
596 struct urb *urb;
597 void *buffer;
598
35c3404e 599 urb = usb_alloc_urb(0, GFP_KERNEL);
e85d0918
DD		 600 if (!urb)
601 return NULL;
35c3404e 602 buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
e85d0918
DD		 603 &urb->transfer_dma);
604 if (!buffer) {
605 usb_free_urb(urb);
606 return NULL;
607 }
608
609 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
610 buffer, USB_MAX_RX_SIZE,
611 rx_urb_complete, usb);
612 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
613
614 return urb;
615}
616
c48cf125 617static void free_urb(struct urb *urb)
e85d0918
DD		 618{
619 if (!urb)
620 return;
621 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
622 urb->transfer_buffer, urb->transfer_dma);
623 usb_free_urb(urb);
624}
625
626int zd_usb_enable_rx(struct zd_usb *usb)
627{
628 int i, r;
629 struct zd_usb_rx *rx = &usb->rx;
630 struct urb **urbs;
631
632 dev_dbg_f(zd_usb_dev(usb), "\n");
633
634 r = -ENOMEM;
35c3404e 635 urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
e85d0918
DD		 636 if (!urbs)
637 goto error;
638 for (i = 0; i < URBS_COUNT; i++) {
639 urbs[i] = alloc_urb(usb);
640 if (!urbs[i])
641 goto error;
642 }
643
644 ZD_ASSERT(!irqs_disabled());
645 spin_lock_irq(&rx->lock);
646 if (rx->urbs) {
647 spin_unlock_irq(&rx->lock);
648 r = 0;
649 goto error;
650 }
651 rx->urbs = urbs;
652 rx->urbs_count = URBS_COUNT;
653 spin_unlock_irq(&rx->lock);
654
655 for (i = 0; i < URBS_COUNT; i++) {
35c3404e 656 r = usb_submit_urb(urbs[i], GFP_KERNEL);
e85d0918
DD		 657 if (r)
658 goto error_submit;
659 }
660
661 return 0;
662error_submit:
663 for (i = 0; i < URBS_COUNT; i++) {
664 usb_kill_urb(urbs[i]);
665 }
666 spin_lock_irq(&rx->lock);
667 rx->urbs = NULL;
668 rx->urbs_count = 0;
669 spin_unlock_irq(&rx->lock);
670error:
671 if (urbs) {
672 for (i = 0; i < URBS_COUNT; i++)
673 free_urb(urbs[i]);
674 }
675 return r;
676}
677
678void zd_usb_disable_rx(struct zd_usb *usb)
679{
680 int i;
681 unsigned long flags;
682 struct urb **urbs;
683 unsigned int count;
684 struct zd_usb_rx *rx = &usb->rx;
685
686 spin_lock_irqsave(&rx->lock, flags);
687 urbs = rx->urbs;
688 count = rx->urbs_count;
689 spin_unlock_irqrestore(&rx->lock, flags);
690 if (!urbs)
691 return;
692
693 for (i = 0; i < count; i++) {
694 usb_kill_urb(urbs[i]);
695 free_urb(urbs[i]);
696 }
697 kfree(urbs);
698
699 spin_lock_irqsave(&rx->lock, flags);
700 rx->urbs = NULL;
701 rx->urbs_count = 0;
702 spin_unlock_irqrestore(&rx->lock, flags);
703}
704
7d12e780 705static void tx_urb_complete(struct urb *urb)
e85d0918
DD		 706{
707 int r;
708
709 switch (urb->status) {
710 case 0:
711 break;
712 case -ESHUTDOWN:
713 case -EINVAL:
714 case -ENODEV:
715 case -ENOENT:
716 case -ECONNRESET:
b312d799 717 case -EPIPE:
e85d0918
DD		 718 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
719 break;
e85d0918
DD		 720 default:
721 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
722 goto resubmit;
723 }
724free_urb:
725 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
726 urb->transfer_buffer, urb->transfer_dma);
727 usb_free_urb(urb);
728 return;
729resubmit:
730 r = usb_submit_urb(urb, GFP_ATOMIC);
731 if (r) {
732 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
733 goto free_urb;
734 }
735}
736
737/* Puts the frame on the USB endpoint. It doesn't wait for
738 * completion. The frame must contain the control set.
739 */
740int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
741{
742 int r;
743 struct usb_device *udev = zd_usb_to_usbdev(usb);
744 struct urb *urb;
745 void *buffer;
746
747 urb = usb_alloc_urb(0, GFP_ATOMIC);
748 if (!urb) {
749 r = -ENOMEM;
750 goto out;
751 }
752
753 buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
754 &urb->transfer_dma);
755 if (!buffer) {
756 r = -ENOMEM;
757 goto error_free_urb;
758 }
759 memcpy(buffer, frame, length);
760
761 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
762 buffer, length, tx_urb_complete, NULL);
763 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
764
765 r = usb_submit_urb(urb, GFP_ATOMIC);
766 if (r)
767 goto error;
768 return 0;
769error:
770 usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
771 urb->transfer_dma);
772error_free_urb:
773 usb_free_urb(urb);
774out:
775 return r;
776}
777
778static inline void init_usb_interrupt(struct zd_usb *usb)
779{
780 struct zd_usb_interrupt *intr = &usb->intr;
781
782 spin_lock_init(&intr->lock);
783 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
784 init_completion(&intr->read_regs.completion);
0ce34bc8 785 intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
e85d0918
DD		 786}
787
788static inline void init_usb_rx(struct zd_usb *usb)
789{
790 struct zd_usb_rx *rx = &usb->rx;
791 spin_lock_init(&rx->lock);
792 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
793 rx->usb_packet_size = 512;
794 } else {
795 rx->usb_packet_size = 64;
796 }
797 ZD_ASSERT(rx->fragment_length == 0);
798}
799
800static inline void init_usb_tx(struct zd_usb *usb)
801{
802 /* FIXME: at this point we will allocate a fixed number of urb's for
803 * use in a cyclic scheme */
804}
805
806void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
807 struct usb_interface *intf)
808{
809 memset(usb, 0, sizeof(*usb));
810 usb->intf = usb_get_intf(intf);
811 usb_set_intfdata(usb->intf, netdev);
812 init_usb_interrupt(usb);
813 init_usb_tx(usb);
814 init_usb_rx(usb);
815}
816
e85d0918
DD		 817void zd_usb_clear(struct zd_usb *usb)
818{
819 usb_set_intfdata(usb->intf, NULL);
820 usb_put_intf(usb->intf);
c48cf125 821 ZD_MEMCLEAR(usb, sizeof(*usb));
e85d0918
DD		 822 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
823}
824
825static const char *speed(enum usb_device_speed speed)
826{
827 switch (speed) {
828 case USB_SPEED_LOW:
829 return "low";
830 case USB_SPEED_FULL:
831 return "full";
832 case USB_SPEED_HIGH:
833 return "high";
834 default:
835 return "unknown speed";
836 }
837}
838
839static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
840{
841 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
842 le16_to_cpu(udev->descriptor.idVendor),
843 le16_to_cpu(udev->descriptor.idProduct),
844 get_bcdDevice(udev),
845 speed(udev->speed));
846}
847
848int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
849{
850 struct usb_device *udev = interface_to_usbdev(usb->intf);
851 return scnprint_id(udev, buffer, size);
852}
853
854#ifdef DEBUG
855static void print_id(struct usb_device *udev)
856{
857 char buffer[40];
858
859 scnprint_id(udev, buffer, sizeof(buffer));
860 buffer[sizeof(buffer)-1] = 0;
861 dev_dbg_f(&udev->dev, "%s\n", buffer);
862}
863#else
864#define print_id(udev) do { } while (0)
865#endif
866
a1030e92
DD		 867static int eject_installer(struct usb_interface *intf)
868{
869 struct usb_device *udev = interface_to_usbdev(intf);
870 struct usb_host_interface *iface_desc = &intf->altsetting[0];
871 struct usb_endpoint_descriptor *endpoint;
872 unsigned char *cmd;
873 u8 bulk_out_ep;
874 int r;
875
876 /* Find bulk out endpoint */
877 endpoint = &iface_desc->endpoint[1].desc;
878 if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
879 (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
880 USB_ENDPOINT_XFER_BULK) {
881 bulk_out_ep = endpoint->bEndpointAddress;
882 } else {
883 dev_err(&udev->dev,
884 "zd1211rw: Could not find bulk out endpoint\n");
885 return -ENODEV;
886 }
887
888 cmd = kzalloc(31, GFP_KERNEL);
889 if (cmd == NULL)
890 return -ENODEV;
891
892 /* USB bulk command block */
893 cmd[0] = 0x55; /* bulk command signature */
894 cmd[1] = 0x53; /* bulk command signature */
895 cmd[2] = 0x42; /* bulk command signature */
896 cmd[3] = 0x43; /* bulk command signature */
897 cmd[14] = 6; /* command length */
898
899 cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
900 cmd[19] = 0x2; /* eject disc */
901
902 dev_info(&udev->dev, "Ejecting virtual installer media...\n");
903 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
904 cmd, 31, NULL, 2000);
905 kfree(cmd);
906 if (r)
907 return r;
908
909 /* At this point, the device disconnects and reconnects with the real
910 * ID numbers. */
911
912 usb_set_intfdata(intf, NULL);
913 return 0;
914}
915
e85d0918
DD		 916static int probe(struct usb_interface *intf, const struct usb_device_id *id)
917{
918 int r;
919 struct usb_device *udev = interface_to_usbdev(intf);
920 struct net_device *netdev = NULL;
921
922 print_id(udev);
923
a1030e92
DD		 924 if (id->driver_info & DEVICE_INSTALLER)
925 return eject_installer(intf);
926
e85d0918
DD		 927 switch (udev->speed) {
928 case USB_SPEED_LOW:
929 case USB_SPEED_FULL:
930 case USB_SPEED_HIGH:
931 break;
932 default:
933 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
934 r = -ENODEV;
935 goto error;
936 }
937
6e3632f6
UK		 938 usb_reset_device(interface_to_usbdev(intf));
939
e85d0918
DD		 940 netdev = zd_netdev_alloc(intf);
941 if (netdev == NULL) {
942 r = -ENOMEM;
943 goto error;
944 }
945
946 r = upload_firmware(udev, id->driver_info);
947 if (r) {
948 dev_err(&intf->dev,
949 "couldn't load firmware. Error number %d\n", r);
950 goto error;
951 }
952
953 r = usb_reset_configuration(udev);
954 if (r) {
955 dev_dbg_f(&intf->dev,
956 "couldn't reset configuration. Error number %d\n", r);
957 goto error;
958 }
959
960 /* At this point the interrupt endpoint is not generally enabled. We
961 * save the USB bandwidth until the network device is opened. But
962 * notify that the initialization of the MAC will require the
963 * interrupts to be temporary enabled.
964 */
965 r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
966 if (r) {
967 dev_dbg_f(&intf->dev,
968 "couldn't initialize mac. Error number %d\n", r);
969 goto error;
970 }
971
972 r = register_netdev(netdev);
973 if (r) {
974 dev_dbg_f(&intf->dev,
975 "couldn't register netdev. Error number %d\n", r);
976 goto error;
977 }
978
979 dev_dbg_f(&intf->dev, "successful\n");
980 dev_info(&intf->dev,"%s\n", netdev->name);
981 return 0;
982error:
983 usb_reset_device(interface_to_usbdev(intf));
984 zd_netdev_free(netdev);
985 return r;
986}
987
988static void disconnect(struct usb_interface *intf)
989{
990 struct net_device *netdev = zd_intf_to_netdev(intf);
991 struct zd_mac *mac = zd_netdev_mac(netdev);
992 struct zd_usb *usb = &mac->chip.usb;
993
a1030e92
DD		 994 /* Either something really bad happened, or we're just dealing with
995 * a DEVICE_INSTALLER. */
996 if (netdev == NULL)
997 return;
998
e85d0918
DD		 999 dev_dbg_f(zd_usb_dev(usb), "\n");
1000
1001 zd_netdev_disconnect(netdev);
1002
1003 /* Just in case something has gone wrong! */
1004 zd_usb_disable_rx(usb);
1005 zd_usb_disable_int(usb);
1006
1007 /* If the disconnect has been caused by a removal of the
1008 * driver module, the reset allows reloading of the driver. If the
1009 * reset will not be executed here, the upload of the firmware in the
1010 * probe function caused by the reloading of the driver will fail.
1011 */
1012 usb_reset_device(interface_to_usbdev(intf));
1013
e85d0918
DD		 1014 zd_netdev_free(netdev);
1015 dev_dbg(&intf->dev, "disconnected\n");
1016}
1017
1018static struct usb_driver driver = {
1019 .name = "zd1211rw",
1020 .id_table = usb_ids,
1021 .probe = probe,
1022 .disconnect = disconnect,
1023};
1024
bc5f06a8
UK		 1025struct workqueue_struct *zd_workqueue;
1026
e85d0918
DD		 1027static int __init usb_init(void)
1028{
1029 int r;
1030
741fec53 1031 pr_debug("%s usb_init()\n", driver.name);
e85d0918 1032
bc5f06a8
UK		 1033 zd_workqueue = create_singlethread_workqueue(driver.name);
1034 if (zd_workqueue == NULL) {
741fec53 1035 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
bc5f06a8
UK		 1036 return -ENOMEM;
1037 }
1038
e85d0918
DD		 1039 r = usb_register(&driver);
1040 if (r) {
192b775c 1041 destroy_workqueue(zd_workqueue);
741fec53
UK		 1042 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1043 driver.name, r);
e85d0918
DD		 1044 return r;
1045 }
1046
741fec53 1047 pr_debug("%s initialized\n", driver.name);
e85d0918
DD		 1048 return 0;
1049}
1050
1051static void __exit usb_exit(void)
1052{
741fec53 1053 pr_debug("%s usb_exit()\n", driver.name);
e85d0918 1054 usb_deregister(&driver);
bc5f06a8 1055 destroy_workqueue(zd_workqueue);
e85d0918
DD		 1056}
1057
1058module_init(usb_init);
1059module_exit(usb_exit);
1060
1061static int usb_int_regs_length(unsigned int count)
1062{
1063 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1064}
1065
1066static void prepare_read_regs_int(struct zd_usb *usb)
1067{
1068 struct zd_usb_interrupt *intr = &usb->intr;
1069
a68077de 1070 spin_lock_irq(&intr->lock);
e85d0918
DD		 1071 intr->read_regs_enabled = 1;
1072 INIT_COMPLETION(intr->read_regs.completion);
a68077de
UK		 1073 spin_unlock_irq(&intr->lock);
1074}
1075
1076static void disable_read_regs_int(struct zd_usb *usb)
1077{
1078 struct zd_usb_interrupt *intr = &usb->intr;
1079
1080 spin_lock_irq(&intr->lock);
1081 intr->read_regs_enabled = 0;
1082 spin_unlock_irq(&intr->lock);
e85d0918
DD		 1083}
1084
1085static int get_results(struct zd_usb *usb, u16 *values,
1086 struct usb_req_read_regs *req, unsigned int count)
1087{
1088 int r;
1089 int i;
1090 struct zd_usb_interrupt *intr = &usb->intr;
1091 struct read_regs_int *rr = &intr->read_regs;
1092 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1093
a68077de 1094 spin_lock_irq(&intr->lock);
e85d0918
DD		 1095
1096 r = -EIO;
1097 /* The created block size seems to be larger than expected.
1098 * However results appear to be correct.
1099 */
1100 if (rr->length < usb_int_regs_length(count)) {
1101 dev_dbg_f(zd_usb_dev(usb),
1102 "error: actual length %d less than expected %d\n",
1103 rr->length, usb_int_regs_length(count));
1104 goto error_unlock;
1105 }
1106 if (rr->length > sizeof(rr->buffer)) {
1107 dev_dbg_f(zd_usb_dev(usb),
1108 "error: actual length %d exceeds buffer size %zu\n",
1109 rr->length, sizeof(rr->buffer));
1110 goto error_unlock;
1111 }
1112
1113 for (i = 0; i < count; i++) {
1114 struct reg_data *rd = &regs->regs[i];
1115 if (rd->addr != req->addr[i]) {
1116 dev_dbg_f(zd_usb_dev(usb),
1117 "rd[%d] addr %#06hx expected %#06hx\n", i,
1118 le16_to_cpu(rd->addr),
1119 le16_to_cpu(req->addr[i]));
1120 goto error_unlock;
1121 }
1122 values[i] = le16_to_cpu(rd->value);
1123 }
1124
1125 r = 0;
1126error_unlock:
a68077de 1127 spin_unlock_irq(&intr->lock);
e85d0918
DD		 1128 return r;
1129}
1130
1131int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1132 const zd_addr_t *addresses, unsigned int count)
1133{
1134 int r;
1135 int i, req_len, actual_req_len;
1136 struct usb_device *udev;
1137 struct usb_req_read_regs *req = NULL;
1138 unsigned long timeout;
1139
1140 if (count < 1) {
1141 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1142 return -EINVAL;
1143 }
1144 if (count > USB_MAX_IOREAD16_COUNT) {
1145 dev_dbg_f(zd_usb_dev(usb),
1146 "error: count %u exceeds possible max %u\n",
1147 count, USB_MAX_IOREAD16_COUNT);
1148 return -EINVAL;
1149 }
1150 if (in_atomic()) {
1151 dev_dbg_f(zd_usb_dev(usb),
1152 "error: io in atomic context not supported\n");
1153 return -EWOULDBLOCK;
1154 }
1155 if (!usb_int_enabled(usb)) {
1156 dev_dbg_f(zd_usb_dev(usb),
1157 "error: usb interrupt not enabled\n");
1158 return -EWOULDBLOCK;
1159 }
1160
1161 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
35c3404e 1162 req = kmalloc(req_len, GFP_KERNEL);
e85d0918
DD		 1163 if (!req)
1164 return -ENOMEM;
1165 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1166 for (i = 0; i < count; i++)
0ce34bc8 1167 req->addr[i] = cpu_to_le16((u16)addresses[i]);
e85d0918
DD		 1168
1169 udev = zd_usb_to_usbdev(usb);
1170 prepare_read_regs_int(usb);
1171 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1172 req, req_len, &actual_req_len, 1000 /* ms */);
1173 if (r) {
1174 dev_dbg_f(zd_usb_dev(usb),
1175 "error in usb_bulk_msg(). Error number %d\n", r);
1176 goto error;
1177 }
1178 if (req_len != actual_req_len) {
1179 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1180 " req_len %d != actual_req_len %d\n",
1181 req_len, actual_req_len);
1182 r = -EIO;
1183 goto error;
1184 }
1185
1186 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1187 msecs_to_jiffies(1000));
1188 if (!timeout) {
1189 disable_read_regs_int(usb);
1190 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1191 r = -ETIMEDOUT;
1192 goto error;
1193 }
1194
1195 r = get_results(usb, values, req, count);
1196error:
1197 kfree(req);
1198 return r;
1199}
1200
1201int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1202 unsigned int count)
1203{
1204 int r;
1205 struct usb_device *udev;
1206 struct usb_req_write_regs *req = NULL;
1207 int i, req_len, actual_req_len;
1208
1209 if (count == 0)
1210 return 0;
1211 if (count > USB_MAX_IOWRITE16_COUNT) {
1212 dev_dbg_f(zd_usb_dev(usb),
1213 "error: count %u exceeds possible max %u\n",
1214 count, USB_MAX_IOWRITE16_COUNT);
1215 return -EINVAL;
1216 }
1217 if (in_atomic()) {
1218 dev_dbg_f(zd_usb_dev(usb),
1219 "error: io in atomic context not supported\n");
1220 return -EWOULDBLOCK;
1221 }
1222
1223 req_len = sizeof(struct usb_req_write_regs) +
1224 count * sizeof(struct reg_data);
35c3404e 1225 req = kmalloc(req_len, GFP_KERNEL);
e85d0918
DD		 1226 if (!req)
1227 return -ENOMEM;
1228
1229 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1230 for (i = 0; i < count; i++) {
1231 struct reg_data *rw = &req->reg_writes[i];
0ce34bc8 1232 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
e85d0918
DD		 1233 rw->value = cpu_to_le16(ioreqs[i].value);
1234 }
1235
1236 udev = zd_usb_to_usbdev(usb);
1237 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1238 req, req_len, &actual_req_len, 1000 /* ms */);
1239 if (r) {
1240 dev_dbg_f(zd_usb_dev(usb),
1241 "error in usb_bulk_msg(). Error number %d\n", r);
1242 goto error;
1243 }
1244 if (req_len != actual_req_len) {
1245 dev_dbg_f(zd_usb_dev(usb),
1246 "error in usb_bulk_msg()"
1247 " req_len %d != actual_req_len %d\n",
1248 req_len, actual_req_len);
1249 r = -EIO;
1250 goto error;
1251 }
1252
1253 /* FALL-THROUGH with r == 0 */
1254error:
1255 kfree(req);
1256 return r;
1257}
1258
1259int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1260{
1261 int r;
1262 struct usb_device *udev;
1263 struct usb_req_rfwrite *req = NULL;
1264 int i, req_len, actual_req_len;
1265 u16 bit_value_template;
1266
1267 if (in_atomic()) {
1268 dev_dbg_f(zd_usb_dev(usb),
1269 "error: io in atomic context not supported\n");
1270 return -EWOULDBLOCK;
1271 }
1272 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1273 dev_dbg_f(zd_usb_dev(usb),
1274 "error: bits %d are smaller than"
1275 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1276 bits, USB_MIN_RFWRITE_BIT_COUNT);
1277 return -EINVAL;
1278 }
1279 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1280 dev_dbg_f(zd_usb_dev(usb),
1281 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1282 bits, USB_MAX_RFWRITE_BIT_COUNT);
1283 return -EINVAL;
1284 }
1285#ifdef DEBUG
1286 if (value & (~0UL << bits)) {
1287 dev_dbg_f(zd_usb_dev(usb),
1288 "error: value %#09x has bits >= %d set\n",
1289 value, bits);
1290 return -EINVAL;
1291 }
1292#endif /* DEBUG */
1293
1294 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1295
1296 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1297 if (r) {
1298 dev_dbg_f(zd_usb_dev(usb),
1299 "error %d: Couldn't read CR203\n", r);
1300 goto out;
1301 }
1302 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1303
1304 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
35c3404e 1305 req = kmalloc(req_len, GFP_KERNEL);
e85d0918
DD		 1306 if (!req)
1307 return -ENOMEM;
1308
1309 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1310 /* 1: 3683a, but not used in ZYDAS driver */
1311 req->value = cpu_to_le16(2);
1312 req->bits = cpu_to_le16(bits);
1313
1314 for (i = 0; i < bits; i++) {
1315 u16 bv = bit_value_template;
1316 if (value & (1 << (bits-1-i)))
1317 bv |= RF_DATA;
1318 req->bit_values[i] = cpu_to_le16(bv);
1319 }
1320
1321 udev = zd_usb_to_usbdev(usb);
1322 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1323 req, req_len, &actual_req_len, 1000 /* ms */);
1324 if (r) {
1325 dev_dbg_f(zd_usb_dev(usb),
1326 "error in usb_bulk_msg(). Error number %d\n", r);
1327 goto out;
1328 }
1329 if (req_len != actual_req_len) {
1330 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1331 " req_len %d != actual_req_len %d\n",
1332 req_len, actual_req_len);
1333 r = -EIO;
1334 goto out;
1335 }
1336
1337 /* FALL-THROUGH with r == 0 */
1338out:
1339 kfree(req);
1340 return r;
1341}
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