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[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 },
a3fa3aba 55 { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
e85d0918
DD		 56 /* ZD1211B */
57 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
58 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
dd2f5538 59 { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
943599ee 60 { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
8e87295b 61 { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
a2bdcc67
DD		 62 { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
63 { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
33218ba1 64 { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
2e9b2467 65 { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
aec91028
DD		 66 { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
67 { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
c445a31c 68 { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
5d082fe8 69 { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
a1030e92
DD		 70 /* "Driverless" devices that need ejecting */
71 { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
e85d0918
DD		 72 {}
73};
74
75MODULE_LICENSE("GPL");
76MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
77MODULE_AUTHOR("Ulrich Kunitz");
78MODULE_AUTHOR("Daniel Drake");
79MODULE_VERSION("1.0");
80MODULE_DEVICE_TABLE(usb, usb_ids);
81
82#define FW_ZD1211_PREFIX "zd1211/zd1211_"
83#define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
84
e85d0918
DD		 85/* USB device initialization */
86
87static int request_fw_file(
88 const struct firmware **fw, const char *name, struct device *device)
89{
90 int r;
91
92 dev_dbg_f(device, "fw name %s\n", name);
93
94 r = request_firmware(fw, name, device);
95 if (r)
96 dev_err(device,
97 "Could not load firmware file %s. Error number %d\n",
98 name, r);
99 return r;
100}
101
102static inline u16 get_bcdDevice(const struct usb_device *udev)
103{
104 return le16_to_cpu(udev->descriptor.bcdDevice);
105}
106
107enum upload_code_flags {
108 REBOOT = 1,
109};
110
111/* Ensures that MAX_TRANSFER_SIZE is even. */
112#define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
113
114static int upload_code(struct usb_device *udev,
115 const u8 *data, size_t size, u16 code_offset, int flags)
116{
117 u8 *p;
118 int r;
119
120 /* USB request blocks need "kmalloced" buffers.
121 */
122 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
123 if (!p) {
124 dev_err(&udev->dev, "out of memory\n");
125 r = -ENOMEM;
126 goto error;
127 }
128
129 size &= ~1;
130 while (size > 0) {
131 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
132 size : MAX_TRANSFER_SIZE;
133
134 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
135
136 memcpy(p, data, transfer_size);
137 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
138 USB_REQ_FIRMWARE_DOWNLOAD,
139 USB_DIR_OUT | USB_TYPE_VENDOR,
140 code_offset, 0, p, transfer_size, 1000 /* ms */);
141 if (r < 0) {
142 dev_err(&udev->dev,
143 "USB control request for firmware upload"
144 " failed. Error number %d\n", r);
145 goto error;
146 }
147 transfer_size = r & ~1;
148
149 size -= transfer_size;
150 data += transfer_size;
151 code_offset += transfer_size/sizeof(u16);
152 }
153
154 if (flags & REBOOT) {
155 u8 ret;
156
157 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
158 USB_REQ_FIRMWARE_CONFIRM,
159 USB_DIR_IN | USB_TYPE_VENDOR,
160 0, 0, &ret, sizeof(ret), 5000 /* ms */);
161 if (r != sizeof(ret)) {
162 dev_err(&udev->dev,
163 "control request firmeware confirmation failed."
164 " Return value %d\n", r);
165 if (r >= 0)
166 r = -ENODEV;
167 goto error;
168 }
169 if (ret & 0x80) {
170 dev_err(&udev->dev,
171 "Internal error while downloading."
172 " Firmware confirm return value %#04x\n",
173 (unsigned int)ret);
174 r = -ENODEV;
175 goto error;
176 }
177 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
178 (unsigned int)ret);
179 }
180
181 r = 0;
182error:
183 kfree(p);
184 return r;
185}
186
187static u16 get_word(const void *data, u16 offset)
188{
189 const __le16 *p = data;
190 return le16_to_cpu(p[offset]);
191}
192
193static char *get_fw_name(char *buffer, size_t size, u8 device_type,
194 const char* postfix)
195{
196 scnprintf(buffer, size, "%s%s",
197 device_type == DEVICE_ZD1211B ?
198 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
199 postfix);
200 return buffer;
201}
202
d066c219
DD		 203static int handle_version_mismatch(struct usb_device *udev, u8 device_type,
204 const struct firmware *ub_fw)
205{
206 const struct firmware *ur_fw = NULL;
207 int offset;
208 int r = 0;
209 char fw_name[128];
210
211 r = request_fw_file(&ur_fw,
212 get_fw_name(fw_name, sizeof(fw_name), device_type, "ur"),
213 &udev->dev);
214 if (r)
215 goto error;
216
ee302767 217 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
d066c219
DD		 218 if (r)
219 goto error;
220
ee302767 221 offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
d066c219 222 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
ee302767 223 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
d066c219
DD		 224
225 /* At this point, the vendor driver downloads the whole firmware
226 * image, hacks around with version IDs, and uploads it again,
227 * completely overwriting the boot code. We do not do this here as
228 * it is not required on any tested devices, and it is suspected to
229 * cause problems. */
230error:
231 release_firmware(ur_fw);
232 return r;
233}
234
e85d0918
DD		 235static int upload_firmware(struct usb_device *udev, u8 device_type)
236{
237 int r;
238 u16 fw_bcdDevice;
239 u16 bcdDevice;
240 const struct firmware *ub_fw = NULL;
241 const struct firmware *uph_fw = NULL;
242 char fw_name[128];
243
244 bcdDevice = get_bcdDevice(udev);
245
246 r = request_fw_file(&ub_fw,
247 get_fw_name(fw_name, sizeof(fw_name), device_type, "ub"),
248 &udev->dev);
249 if (r)
250 goto error;
251
ee302767 252 fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
e85d0918 253
e85d0918
DD		 254 if (fw_bcdDevice != bcdDevice) {
255 dev_info(&udev->dev,
d066c219
DD		 256 "firmware version %#06x and device bootcode version "
257 "%#06x differ\n", fw_bcdDevice, bcdDevice);
258 if (bcdDevice <= 0x4313)
259 dev_warn(&udev->dev, "device has old bootcode, please "
260 "report success or failure\n");
261
262 r = handle_version_mismatch(udev, device_type, ub_fw);
263 if (r)
264 goto error;
e85d0918
DD		 265 } else {
266 dev_dbg_f(&udev->dev,
267 "firmware device id %#06x is equal to the "
268 "actual device id\n", fw_bcdDevice);
269 }
270
271
272 r = request_fw_file(&uph_fw,
273 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
274 &udev->dev);
275 if (r)
276 goto error;
277
ee302767 278 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
e85d0918
DD		 279 if (r) {
280 dev_err(&udev->dev,
281 "Could not upload firmware code uph. Error number %d\n",
282 r);
283 }
284
285 /* FALL-THROUGH */
286error:
287 release_firmware(ub_fw);
288 release_firmware(uph_fw);
289 return r;
290}
291
e85d0918
DD		 292#define urb_dev(urb) (&(urb)->dev->dev)
293
294static inline void handle_regs_int(struct urb *urb)
295{
296 struct zd_usb *usb = urb->context;
297 struct zd_usb_interrupt *intr = &usb->intr;
298 int len;
299
300 ZD_ASSERT(in_interrupt());
301 spin_lock(&intr->lock);
302
303 if (intr->read_regs_enabled) {
304 intr->read_regs.length = len = urb->actual_length;
305
306 if (len > sizeof(intr->read_regs.buffer))
307 len = sizeof(intr->read_regs.buffer);
308 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
309 intr->read_regs_enabled = 0;
310 complete(&intr->read_regs.completion);
311 goto out;
312 }
313
314 dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
315out:
316 spin_unlock(&intr->lock);
317}
318
319static inline void handle_retry_failed_int(struct urb *urb)
320{
22d3405f
UK		 321 struct zd_usb *usb = urb->context;
322 struct zd_mac *mac = zd_usb_to_mac(usb);
323 struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
324
325 ieee->stats.tx_errors++;
326 ieee->ieee_stats.tx_retry_limit_exceeded++;
e85d0918
DD		 327 dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
328}
329
330
7d12e780 331static void int_urb_complete(struct urb *urb)
e85d0918
DD		 332{
333 int r;
334 struct usb_int_header *hdr;
335
336 switch (urb->status) {
337 case 0:
338 break;
339 case -ESHUTDOWN:
340 case -EINVAL:
341 case -ENODEV:
342 case -ENOENT:
343 case -ECONNRESET:
e85d0918 344 case -EPIPE:
b312d799 345 goto kfree;
e85d0918
DD		 346 default:
347 goto resubmit;
348 }
349
350 if (urb->actual_length < sizeof(hdr)) {
351 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
352 goto resubmit;
353 }
354
355 hdr = urb->transfer_buffer;
356 if (hdr->type != USB_INT_TYPE) {
357 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
358 goto resubmit;
359 }
360
361 switch (hdr->id) {
362 case USB_INT_ID_REGS:
363 handle_regs_int(urb);
364 break;
365 case USB_INT_ID_RETRY_FAILED:
366 handle_retry_failed_int(urb);
367 break;
368 default:
369 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
370 (unsigned int)hdr->id);
371 goto resubmit;
372 }
373
374resubmit:
375 r = usb_submit_urb(urb, GFP_ATOMIC);
376 if (r) {
377 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
378 goto kfree;
379 }
380 return;
381kfree:
382 kfree(urb->transfer_buffer);
383}
384
385static inline int int_urb_interval(struct usb_device *udev)
386{
387 switch (udev->speed) {
388 case USB_SPEED_HIGH:
389 return 4;
390 case USB_SPEED_LOW:
391 return 10;
392 case USB_SPEED_FULL:
393 default:
394 return 1;
395 }
396}
397
398static inline int usb_int_enabled(struct zd_usb *usb)
399{
400 unsigned long flags;
401 struct zd_usb_interrupt *intr = &usb->intr;
402 struct urb *urb;
403
404 spin_lock_irqsave(&intr->lock, flags);
405 urb = intr->urb;
406 spin_unlock_irqrestore(&intr->lock, flags);
407 return urb != NULL;
408}
409
410int zd_usb_enable_int(struct zd_usb *usb)
411{
412 int r;
413 struct usb_device *udev;
414 struct zd_usb_interrupt *intr = &usb->intr;
415 void *transfer_buffer = NULL;
416 struct urb *urb;
417
418 dev_dbg_f(zd_usb_dev(usb), "\n");
419
35c3404e 420 urb = usb_alloc_urb(0, GFP_KERNEL);
e85d0918
DD		 421 if (!urb) {
422 r = -ENOMEM;
423 goto out;
424 }
425
426 ZD_ASSERT(!irqs_disabled());
427 spin_lock_irq(&intr->lock);
428 if (intr->urb) {
429 spin_unlock_irq(&intr->lock);
430 r = 0;
431 goto error_free_urb;
432 }
433 intr->urb = urb;
434 spin_unlock_irq(&intr->lock);
435
436 /* TODO: make it a DMA buffer */
437 r = -ENOMEM;
35c3404e 438 transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
e85d0918
DD		 439 if (!transfer_buffer) {
440 dev_dbg_f(zd_usb_dev(usb),
441 "couldn't allocate transfer_buffer\n");
442 goto error_set_urb_null;
443 }
444
445 udev = zd_usb_to_usbdev(usb);
446 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
447 transfer_buffer, USB_MAX_EP_INT_BUFFER,
448 int_urb_complete, usb,
449 intr->interval);
450
451 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
35c3404e 452 r = usb_submit_urb(urb, GFP_KERNEL);
e85d0918
DD		 453 if (r) {
454 dev_dbg_f(zd_usb_dev(usb),
455 "Couldn't submit urb. Error number %d\n", r);
456 goto error;
457 }
458
459 return 0;
460error:
461 kfree(transfer_buffer);
462error_set_urb_null:
463 spin_lock_irq(&intr->lock);
464 intr->urb = NULL;
465 spin_unlock_irq(&intr->lock);
466error_free_urb:
467 usb_free_urb(urb);
468out:
469 return r;
470}
471
472void zd_usb_disable_int(struct zd_usb *usb)
473{
474 unsigned long flags;
475 struct zd_usb_interrupt *intr = &usb->intr;
476 struct urb *urb;
477
478 spin_lock_irqsave(&intr->lock, flags);
479 urb = intr->urb;
480 if (!urb) {
481 spin_unlock_irqrestore(&intr->lock, flags);
482 return;
483 }
484 intr->urb = NULL;
485 spin_unlock_irqrestore(&intr->lock, flags);
486
487 usb_kill_urb(urb);
488 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
489 usb_free_urb(urb);
490}
491
492static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
493 unsigned int length)
494{
495 int i;
496 struct zd_mac *mac = zd_usb_to_mac(usb);
497 const struct rx_length_info *length_info;
498
499 if (length < sizeof(struct rx_length_info)) {
500 /* It's not a complete packet anyhow. */
22d3405f
UK		 501 struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
502 ieee->stats.rx_errors++;
503 ieee->stats.rx_length_errors++;
e85d0918
DD		 504 return;
505 }
506 length_info = (struct rx_length_info *)
507 (buffer + length - sizeof(struct rx_length_info));
508
509 /* It might be that three frames are merged into a single URB
510 * transaction. We have to check for the length info tag.
511 *
512 * While testing we discovered that length_info might be unaligned,
513 * because if USB transactions are merged, the last packet will not
514 * be padded. Unaligned access might also happen if the length_info
515 * structure is not present.
516 */
b269825b
UK		 517 if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
518 {
e85d0918
DD		 519 unsigned int l, k, n;
520 for (i = 0, l = 0;; i++) {
b269825b 521 k = le16_to_cpu(get_unaligned(&length_info->length[i]));
850c211c
UK		 522 if (k == 0)
523 return;
e85d0918
DD		 524 n = l+k;
525 if (n > length)
526 return;
4d1feabc 527 zd_mac_rx_irq(mac, buffer+l, k);
e85d0918
DD		 528 if (i >= 2)
529 return;
530 l = (n+3) & ~3;
531 }
532 } else {
4d1feabc 533 zd_mac_rx_irq(mac, buffer, length);
e85d0918
DD		 534 }
535}
536
7d12e780 537static void rx_urb_complete(struct urb *urb)
e85d0918
DD		 538{
539 struct zd_usb *usb;
540 struct zd_usb_rx *rx;
541 const u8 *buffer;
542 unsigned int length;
543
544 switch (urb->status) {
545 case 0:
546 break;
547 case -ESHUTDOWN:
548 case -EINVAL:
549 case -ENODEV:
550 case -ENOENT:
551 case -ECONNRESET:
e85d0918 552 case -EPIPE:
b312d799 553 return;
e85d0918
DD		 554 default:
555 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
556 goto resubmit;
557 }
558
559 buffer = urb->transfer_buffer;
560 length = urb->actual_length;
561 usb = urb->context;
562 rx = &usb->rx;
563
564 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
565 /* If there is an old first fragment, we don't care. */
566 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
567 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
568 spin_lock(&rx->lock);
569 memcpy(rx->fragment, buffer, length);
570 rx->fragment_length = length;
571 spin_unlock(&rx->lock);
572 goto resubmit;
573 }
574
575 spin_lock(&rx->lock);
576 if (rx->fragment_length > 0) {
577 /* We are on a second fragment, we believe */
578 ZD_ASSERT(length + rx->fragment_length <=
579 ARRAY_SIZE(rx->fragment));
580 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
581 memcpy(rx->fragment+rx->fragment_length, buffer, length);
582 handle_rx_packet(usb, rx->fragment,
583 rx->fragment_length + length);
584 rx->fragment_length = 0;
585 spin_unlock(&rx->lock);
586 } else {
587 spin_unlock(&rx->lock);
588 handle_rx_packet(usb, buffer, length);
589 }
590
591resubmit:
592 usb_submit_urb(urb, GFP_ATOMIC);
593}
594
c48cf125 595static struct urb *alloc_urb(struct zd_usb *usb)
e85d0918
DD		 596{
597 struct usb_device *udev = zd_usb_to_usbdev(usb);
598 struct urb *urb;
599 void *buffer;
600
35c3404e 601 urb = usb_alloc_urb(0, GFP_KERNEL);
e85d0918
DD		 602 if (!urb)
603 return NULL;
35c3404e 604 buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
e85d0918
DD		 605 &urb->transfer_dma);
606 if (!buffer) {
607 usb_free_urb(urb);
608 return NULL;
609 }
610
611 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
612 buffer, USB_MAX_RX_SIZE,
613 rx_urb_complete, usb);
614 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
615
616 return urb;
617}
618
c48cf125 619static void free_urb(struct urb *urb)
e85d0918
DD		 620{
621 if (!urb)
622 return;
623 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
624 urb->transfer_buffer, urb->transfer_dma);
625 usb_free_urb(urb);
626}
627
628int zd_usb_enable_rx(struct zd_usb *usb)
629{
630 int i, r;
631 struct zd_usb_rx *rx = &usb->rx;
632 struct urb **urbs;
633
634 dev_dbg_f(zd_usb_dev(usb), "\n");
635
636 r = -ENOMEM;
35c3404e 637 urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
e85d0918
DD		 638 if (!urbs)
639 goto error;
640 for (i = 0; i < URBS_COUNT; i++) {
641 urbs[i] = alloc_urb(usb);
642 if (!urbs[i])
643 goto error;
644 }
645
646 ZD_ASSERT(!irqs_disabled());
647 spin_lock_irq(&rx->lock);
648 if (rx->urbs) {
649 spin_unlock_irq(&rx->lock);
650 r = 0;
651 goto error;
652 }
653 rx->urbs = urbs;
654 rx->urbs_count = URBS_COUNT;
655 spin_unlock_irq(&rx->lock);
656
657 for (i = 0; i < URBS_COUNT; i++) {
35c3404e 658 r = usb_submit_urb(urbs[i], GFP_KERNEL);
e85d0918
DD		 659 if (r)
660 goto error_submit;
661 }
662
663 return 0;
664error_submit:
665 for (i = 0; i < URBS_COUNT; i++) {
666 usb_kill_urb(urbs[i]);
667 }
668 spin_lock_irq(&rx->lock);
669 rx->urbs = NULL;
670 rx->urbs_count = 0;
671 spin_unlock_irq(&rx->lock);
672error:
673 if (urbs) {
674 for (i = 0; i < URBS_COUNT; i++)
675 free_urb(urbs[i]);
676 }
677 return r;
678}
679
680void zd_usb_disable_rx(struct zd_usb *usb)
681{
682 int i;
683 unsigned long flags;
684 struct urb **urbs;
685 unsigned int count;
686 struct zd_usb_rx *rx = &usb->rx;
687
688 spin_lock_irqsave(&rx->lock, flags);
689 urbs = rx->urbs;
690 count = rx->urbs_count;
691 spin_unlock_irqrestore(&rx->lock, flags);
692 if (!urbs)
693 return;
694
695 for (i = 0; i < count; i++) {
696 usb_kill_urb(urbs[i]);
697 free_urb(urbs[i]);
698 }
699 kfree(urbs);
700
701 spin_lock_irqsave(&rx->lock, flags);
702 rx->urbs = NULL;
703 rx->urbs_count = 0;
704 spin_unlock_irqrestore(&rx->lock, flags);
705}
706
7d12e780 707static void tx_urb_complete(struct urb *urb)
e85d0918
DD		 708{
709 int r;
710
711 switch (urb->status) {
712 case 0:
713 break;
714 case -ESHUTDOWN:
715 case -EINVAL:
716 case -ENODEV:
717 case -ENOENT:
718 case -ECONNRESET:
b312d799 719 case -EPIPE:
e85d0918
DD		 720 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
721 break;
e85d0918
DD		 722 default:
723 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
724 goto resubmit;
725 }
726free_urb:
727 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
728 urb->transfer_buffer, urb->transfer_dma);
729 usb_free_urb(urb);
730 return;
731resubmit:
732 r = usb_submit_urb(urb, GFP_ATOMIC);
733 if (r) {
734 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
735 goto free_urb;
736 }
737}
738
739/* Puts the frame on the USB endpoint. It doesn't wait for
740 * completion. The frame must contain the control set.
741 */
742int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
743{
744 int r;
745 struct usb_device *udev = zd_usb_to_usbdev(usb);
746 struct urb *urb;
747 void *buffer;
748
749 urb = usb_alloc_urb(0, GFP_ATOMIC);
750 if (!urb) {
751 r = -ENOMEM;
752 goto out;
753 }
754
755 buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
756 &urb->transfer_dma);
757 if (!buffer) {
758 r = -ENOMEM;
759 goto error_free_urb;
760 }
761 memcpy(buffer, frame, length);
762
763 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
764 buffer, length, tx_urb_complete, NULL);
765 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
766
767 r = usb_submit_urb(urb, GFP_ATOMIC);
768 if (r)
769 goto error;
770 return 0;
771error:
772 usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
773 urb->transfer_dma);
774error_free_urb:
775 usb_free_urb(urb);
776out:
777 return r;
778}
779
780static inline void init_usb_interrupt(struct zd_usb *usb)
781{
782 struct zd_usb_interrupt *intr = &usb->intr;
783
784 spin_lock_init(&intr->lock);
785 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
786 init_completion(&intr->read_regs.completion);
0ce34bc8 787 intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
e85d0918
DD		 788}
789
790static inline void init_usb_rx(struct zd_usb *usb)
791{
792 struct zd_usb_rx *rx = &usb->rx;
793 spin_lock_init(&rx->lock);
794 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
795 rx->usb_packet_size = 512;
796 } else {
797 rx->usb_packet_size = 64;
798 }
799 ZD_ASSERT(rx->fragment_length == 0);
800}
801
802static inline void init_usb_tx(struct zd_usb *usb)
803{
804 /* FIXME: at this point we will allocate a fixed number of urb's for
805 * use in a cyclic scheme */
806}
807
808void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
809 struct usb_interface *intf)
810{
811 memset(usb, 0, sizeof(*usb));
812 usb->intf = usb_get_intf(intf);
813 usb_set_intfdata(usb->intf, netdev);
814 init_usb_interrupt(usb);
815 init_usb_tx(usb);
816 init_usb_rx(usb);
817}
818
e85d0918
DD		 819void zd_usb_clear(struct zd_usb *usb)
820{
821 usb_set_intfdata(usb->intf, NULL);
822 usb_put_intf(usb->intf);
c48cf125 823 ZD_MEMCLEAR(usb, sizeof(*usb));
e85d0918
DD		 824 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
825}
826
827static const char *speed(enum usb_device_speed speed)
828{
829 switch (speed) {
830 case USB_SPEED_LOW:
831 return "low";
832 case USB_SPEED_FULL:
833 return "full";
834 case USB_SPEED_HIGH:
835 return "high";
836 default:
837 return "unknown speed";
838 }
839}
840
841static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
842{
843 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
844 le16_to_cpu(udev->descriptor.idVendor),
845 le16_to_cpu(udev->descriptor.idProduct),
846 get_bcdDevice(udev),
847 speed(udev->speed));
848}
849
850int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
851{
852 struct usb_device *udev = interface_to_usbdev(usb->intf);
853 return scnprint_id(udev, buffer, size);
854}
855
856#ifdef DEBUG
857static void print_id(struct usb_device *udev)
858{
859 char buffer[40];
860
861 scnprint_id(udev, buffer, sizeof(buffer));
862 buffer[sizeof(buffer)-1] = 0;
863 dev_dbg_f(&udev->dev, "%s\n", buffer);
864}
865#else
866#define print_id(udev) do { } while (0)
867#endif
868
a1030e92
DD		 869static int eject_installer(struct usb_interface *intf)
870{
871 struct usb_device *udev = interface_to_usbdev(intf);
872 struct usb_host_interface *iface_desc = &intf->altsetting[0];
873 struct usb_endpoint_descriptor *endpoint;
874 unsigned char *cmd;
875 u8 bulk_out_ep;
876 int r;
877
878 /* Find bulk out endpoint */
879 endpoint = &iface_desc->endpoint[1].desc;
880 if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
881 (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
882 USB_ENDPOINT_XFER_BULK) {
883 bulk_out_ep = endpoint->bEndpointAddress;
884 } else {
885 dev_err(&udev->dev,
886 "zd1211rw: Could not find bulk out endpoint\n");
887 return -ENODEV;
888 }
889
890 cmd = kzalloc(31, GFP_KERNEL);
891 if (cmd == NULL)
892 return -ENODEV;
893
894 /* USB bulk command block */
895 cmd[0] = 0x55; /* bulk command signature */
896 cmd[1] = 0x53; /* bulk command signature */
897 cmd[2] = 0x42; /* bulk command signature */
898 cmd[3] = 0x43; /* bulk command signature */
899 cmd[14] = 6; /* command length */
900
901 cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
902 cmd[19] = 0x2; /* eject disc */
903
904 dev_info(&udev->dev, "Ejecting virtual installer media...\n");
905 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
906 cmd, 31, NULL, 2000);
907 kfree(cmd);
908 if (r)
909 return r;
910
911 /* At this point, the device disconnects and reconnects with the real
912 * ID numbers. */
913
914 usb_set_intfdata(intf, NULL);
915 return 0;
916}
917
e85d0918
DD		 918static int probe(struct usb_interface *intf, const struct usb_device_id *id)
919{
920 int r;
921 struct usb_device *udev = interface_to_usbdev(intf);
922 struct net_device *netdev = NULL;
923
924 print_id(udev);
925
a1030e92
DD		 926 if (id->driver_info & DEVICE_INSTALLER)
927 return eject_installer(intf);
928
e85d0918
DD		 929 switch (udev->speed) {
930 case USB_SPEED_LOW:
931 case USB_SPEED_FULL:
932 case USB_SPEED_HIGH:
933 break;
934 default:
935 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
936 r = -ENODEV;
937 goto error;
938 }
939
6e3632f6
UK		 940 usb_reset_device(interface_to_usbdev(intf));
941
e85d0918
DD		 942 netdev = zd_netdev_alloc(intf);
943 if (netdev == NULL) {
944 r = -ENOMEM;
945 goto error;
946 }
947
948 r = upload_firmware(udev, id->driver_info);
949 if (r) {
950 dev_err(&intf->dev,
951 "couldn't load firmware. Error number %d\n", r);
952 goto error;
953 }
954
955 r = usb_reset_configuration(udev);
956 if (r) {
957 dev_dbg_f(&intf->dev,
958 "couldn't reset configuration. Error number %d\n", r);
959 goto error;
960 }
961
962 /* At this point the interrupt endpoint is not generally enabled. We
963 * save the USB bandwidth until the network device is opened. But
964 * notify that the initialization of the MAC will require the
965 * interrupts to be temporary enabled.
966 */
967 r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
968 if (r) {
969 dev_dbg_f(&intf->dev,
970 "couldn't initialize mac. Error number %d\n", r);
971 goto error;
972 }
973
974 r = register_netdev(netdev);
975 if (r) {
976 dev_dbg_f(&intf->dev,
977 "couldn't register netdev. Error number %d\n", r);
978 goto error;
979 }
980
981 dev_dbg_f(&intf->dev, "successful\n");
982 dev_info(&intf->dev,"%s\n", netdev->name);
983 return 0;
984error:
985 usb_reset_device(interface_to_usbdev(intf));
986 zd_netdev_free(netdev);
987 return r;
988}
989
990static void disconnect(struct usb_interface *intf)
991{
992 struct net_device *netdev = zd_intf_to_netdev(intf);
993 struct zd_mac *mac = zd_netdev_mac(netdev);
994 struct zd_usb *usb = &mac->chip.usb;
995
a1030e92
DD		 996 /* Either something really bad happened, or we're just dealing with
997 * a DEVICE_INSTALLER. */
998 if (netdev == NULL)
999 return;
1000
e85d0918
DD		 1001 dev_dbg_f(zd_usb_dev(usb), "\n");
1002
1003 zd_netdev_disconnect(netdev);
1004
1005 /* Just in case something has gone wrong! */
1006 zd_usb_disable_rx(usb);
1007 zd_usb_disable_int(usb);
1008
1009 /* If the disconnect has been caused by a removal of the
1010 * driver module, the reset allows reloading of the driver. If the
1011 * reset will not be executed here, the upload of the firmware in the
1012 * probe function caused by the reloading of the driver will fail.
1013 */
1014 usb_reset_device(interface_to_usbdev(intf));
1015
e85d0918
DD		 1016 zd_netdev_free(netdev);
1017 dev_dbg(&intf->dev, "disconnected\n");
1018}
1019
1020static struct usb_driver driver = {
1021 .name = "zd1211rw",
1022 .id_table = usb_ids,
1023 .probe = probe,
1024 .disconnect = disconnect,
1025};
1026
bc5f06a8
UK		 1027struct workqueue_struct *zd_workqueue;
1028
e85d0918
DD		 1029static int __init usb_init(void)
1030{
1031 int r;
1032
741fec53 1033 pr_debug("%s usb_init()\n", driver.name);
e85d0918 1034
bc5f06a8
UK		 1035 zd_workqueue = create_singlethread_workqueue(driver.name);
1036 if (zd_workqueue == NULL) {
741fec53 1037 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
bc5f06a8
UK		 1038 return -ENOMEM;
1039 }
1040
e85d0918
DD		 1041 r = usb_register(&driver);
1042 if (r) {
192b775c 1043 destroy_workqueue(zd_workqueue);
741fec53
UK		 1044 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1045 driver.name, r);
e85d0918
DD		 1046 return r;
1047 }
1048
741fec53 1049 pr_debug("%s initialized\n", driver.name);
e85d0918
DD		 1050 return 0;
1051}
1052
1053static void __exit usb_exit(void)
1054{
741fec53 1055 pr_debug("%s usb_exit()\n", driver.name);
e85d0918 1056 usb_deregister(&driver);
bc5f06a8 1057 destroy_workqueue(zd_workqueue);
e85d0918
DD		 1058}
1059
1060module_init(usb_init);
1061module_exit(usb_exit);
1062
1063static int usb_int_regs_length(unsigned int count)
1064{
1065 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1066}
1067
1068static void prepare_read_regs_int(struct zd_usb *usb)
1069{
1070 struct zd_usb_interrupt *intr = &usb->intr;
1071
a68077de 1072 spin_lock_irq(&intr->lock);
e85d0918
DD		 1073 intr->read_regs_enabled = 1;
1074 INIT_COMPLETION(intr->read_regs.completion);
a68077de
UK		 1075 spin_unlock_irq(&intr->lock);
1076}
1077
1078static void disable_read_regs_int(struct zd_usb *usb)
1079{
1080 struct zd_usb_interrupt *intr = &usb->intr;
1081
1082 spin_lock_irq(&intr->lock);
1083 intr->read_regs_enabled = 0;
1084 spin_unlock_irq(&intr->lock);
e85d0918
DD		 1085}
1086
1087static int get_results(struct zd_usb *usb, u16 *values,
1088 struct usb_req_read_regs *req, unsigned int count)
1089{
1090 int r;
1091 int i;
1092 struct zd_usb_interrupt *intr = &usb->intr;
1093 struct read_regs_int *rr = &intr->read_regs;
1094 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1095
a68077de 1096 spin_lock_irq(&intr->lock);
e85d0918
DD		 1097
1098 r = -EIO;
1099 /* The created block size seems to be larger than expected.
1100 * However results appear to be correct.
1101 */
1102 if (rr->length < usb_int_regs_length(count)) {
1103 dev_dbg_f(zd_usb_dev(usb),
1104 "error: actual length %d less than expected %d\n",
1105 rr->length, usb_int_regs_length(count));
1106 goto error_unlock;
1107 }
1108 if (rr->length > sizeof(rr->buffer)) {
1109 dev_dbg_f(zd_usb_dev(usb),
1110 "error: actual length %d exceeds buffer size %zu\n",
1111 rr->length, sizeof(rr->buffer));
1112 goto error_unlock;
1113 }
1114
1115 for (i = 0; i < count; i++) {
1116 struct reg_data *rd = &regs->regs[i];
1117 if (rd->addr != req->addr[i]) {
1118 dev_dbg_f(zd_usb_dev(usb),
1119 "rd[%d] addr %#06hx expected %#06hx\n", i,
1120 le16_to_cpu(rd->addr),
1121 le16_to_cpu(req->addr[i]));
1122 goto error_unlock;
1123 }
1124 values[i] = le16_to_cpu(rd->value);
1125 }
1126
1127 r = 0;
1128error_unlock:
a68077de 1129 spin_unlock_irq(&intr->lock);
e85d0918
DD		 1130 return r;
1131}
1132
1133int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1134 const zd_addr_t *addresses, unsigned int count)
1135{
1136 int r;
1137 int i, req_len, actual_req_len;
1138 struct usb_device *udev;
1139 struct usb_req_read_regs *req = NULL;
1140 unsigned long timeout;
1141
1142 if (count < 1) {
1143 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1144 return -EINVAL;
1145 }
1146 if (count > USB_MAX_IOREAD16_COUNT) {
1147 dev_dbg_f(zd_usb_dev(usb),
1148 "error: count %u exceeds possible max %u\n",
1149 count, USB_MAX_IOREAD16_COUNT);
1150 return -EINVAL;
1151 }
1152 if (in_atomic()) {
1153 dev_dbg_f(zd_usb_dev(usb),
1154 "error: io in atomic context not supported\n");
1155 return -EWOULDBLOCK;
1156 }
1157 if (!usb_int_enabled(usb)) {
1158 dev_dbg_f(zd_usb_dev(usb),
1159 "error: usb interrupt not enabled\n");
1160 return -EWOULDBLOCK;
1161 }
1162
1163 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
35c3404e 1164 req = kmalloc(req_len, GFP_KERNEL);
e85d0918
DD		 1165 if (!req)
1166 return -ENOMEM;
1167 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1168 for (i = 0; i < count; i++)
0ce34bc8 1169 req->addr[i] = cpu_to_le16((u16)addresses[i]);
e85d0918
DD		 1170
1171 udev = zd_usb_to_usbdev(usb);
1172 prepare_read_regs_int(usb);
1173 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1174 req, req_len, &actual_req_len, 1000 /* ms */);
1175 if (r) {
1176 dev_dbg_f(zd_usb_dev(usb),
1177 "error in usb_bulk_msg(). Error number %d\n", r);
1178 goto error;
1179 }
1180 if (req_len != actual_req_len) {
1181 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1182 " req_len %d != actual_req_len %d\n",
1183 req_len, actual_req_len);
1184 r = -EIO;
1185 goto error;
1186 }
1187
1188 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1189 msecs_to_jiffies(1000));
1190 if (!timeout) {
1191 disable_read_regs_int(usb);
1192 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1193 r = -ETIMEDOUT;
1194 goto error;
1195 }
1196
1197 r = get_results(usb, values, req, count);
1198error:
1199 kfree(req);
1200 return r;
1201}
1202
1203int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1204 unsigned int count)
1205{
1206 int r;
1207 struct usb_device *udev;
1208 struct usb_req_write_regs *req = NULL;
1209 int i, req_len, actual_req_len;
1210
1211 if (count == 0)
1212 return 0;
1213 if (count > USB_MAX_IOWRITE16_COUNT) {
1214 dev_dbg_f(zd_usb_dev(usb),
1215 "error: count %u exceeds possible max %u\n",
1216 count, USB_MAX_IOWRITE16_COUNT);
1217 return -EINVAL;
1218 }
1219 if (in_atomic()) {
1220 dev_dbg_f(zd_usb_dev(usb),
1221 "error: io in atomic context not supported\n");
1222 return -EWOULDBLOCK;
1223 }
1224
1225 req_len = sizeof(struct usb_req_write_regs) +
1226 count * sizeof(struct reg_data);
35c3404e 1227 req = kmalloc(req_len, GFP_KERNEL);
e85d0918
DD		 1228 if (!req)
1229 return -ENOMEM;
1230
1231 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1232 for (i = 0; i < count; i++) {
1233 struct reg_data *rw = &req->reg_writes[i];
0ce34bc8 1234 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
e85d0918
DD		 1235 rw->value = cpu_to_le16(ioreqs[i].value);
1236 }
1237
1238 udev = zd_usb_to_usbdev(usb);
1239 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1240 req, req_len, &actual_req_len, 1000 /* ms */);
1241 if (r) {
1242 dev_dbg_f(zd_usb_dev(usb),
1243 "error in usb_bulk_msg(). Error number %d\n", r);
1244 goto error;
1245 }
1246 if (req_len != actual_req_len) {
1247 dev_dbg_f(zd_usb_dev(usb),
1248 "error in usb_bulk_msg()"
1249 " req_len %d != actual_req_len %d\n",
1250 req_len, actual_req_len);
1251 r = -EIO;
1252 goto error;
1253 }
1254
1255 /* FALL-THROUGH with r == 0 */
1256error:
1257 kfree(req);
1258 return r;
1259}
1260
1261int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1262{
1263 int r;
1264 struct usb_device *udev;
1265 struct usb_req_rfwrite *req = NULL;
1266 int i, req_len, actual_req_len;
1267 u16 bit_value_template;
1268
1269 if (in_atomic()) {
1270 dev_dbg_f(zd_usb_dev(usb),
1271 "error: io in atomic context not supported\n");
1272 return -EWOULDBLOCK;
1273 }
1274 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1275 dev_dbg_f(zd_usb_dev(usb),
1276 "error: bits %d are smaller than"
1277 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1278 bits, USB_MIN_RFWRITE_BIT_COUNT);
1279 return -EINVAL;
1280 }
1281 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1282 dev_dbg_f(zd_usb_dev(usb),
1283 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1284 bits, USB_MAX_RFWRITE_BIT_COUNT);
1285 return -EINVAL;
1286 }
1287#ifdef DEBUG
1288 if (value & (~0UL << bits)) {
1289 dev_dbg_f(zd_usb_dev(usb),
1290 "error: value %#09x has bits >= %d set\n",
1291 value, bits);
1292 return -EINVAL;
1293 }
1294#endif /* DEBUG */
1295
1296 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1297
1298 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1299 if (r) {
1300 dev_dbg_f(zd_usb_dev(usb),
1301 "error %d: Couldn't read CR203\n", r);
1302 goto out;
1303 }
1304 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1305
1306 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
35c3404e 1307 req = kmalloc(req_len, GFP_KERNEL);
e85d0918
DD		 1308 if (!req)
1309 return -ENOMEM;
1310
1311 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1312 /* 1: 3683a, but not used in ZYDAS driver */
1313 req->value = cpu_to_le16(2);
1314 req->bits = cpu_to_le16(bits);
1315
1316 for (i = 0; i < bits; i++) {
1317 u16 bv = bit_value_template;
1318 if (value & (1 << (bits-1-i)))
1319 bv |= RF_DATA;
1320 req->bit_values[i] = cpu_to_le16(bv);
1321 }
1322
1323 udev = zd_usb_to_usbdev(usb);
1324 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1325 req, req_len, &actual_req_len, 1000 /* ms */);
1326 if (r) {
1327 dev_dbg_f(zd_usb_dev(usb),
1328 "error in usb_bulk_msg(). Error number %d\n", r);
1329 goto out;
1330 }
1331 if (req_len != actual_req_len) {
1332 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1333 " req_len %d != actual_req_len %d\n",
1334 req_len, actual_req_len);
1335 r = -EIO;
1336 goto out;
1337 }
1338
1339 /* FALL-THROUGH with r == 0 */
1340out:
1341 kfree(req);
1342 return r;
1343}
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