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[PATCH] bcm43xx: output proper link quality with scans
[mirror_ubuntu-zesty-kernel.git] / drivers / net / wireless / zd1211rw / zd_usb.c
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e85d0918
DD		 1/* zd_usb.c
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 */
17
18#include <asm/unaligned.h>
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 },
e85d0918
DD		 50 /* ZD1211B */
51 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
52 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
dd2f5538 53 { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
943599ee 54 { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
a1030e92
DD		 55 /* "Driverless" devices that need ejecting */
56 { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
e85d0918
DD		 57 {}
58};
59
60MODULE_LICENSE("GPL");
61MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
62MODULE_AUTHOR("Ulrich Kunitz");
63MODULE_AUTHOR("Daniel Drake");
64MODULE_VERSION("1.0");
65MODULE_DEVICE_TABLE(usb, usb_ids);
66
67#define FW_ZD1211_PREFIX "zd1211/zd1211_"
68#define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
69
70/* register address handling */
71
72#ifdef DEBUG
73static int check_addr(struct zd_usb *usb, zd_addr_t addr)
74{
75 u32 base = ZD_ADDR_BASE(addr);
76 u32 offset = ZD_OFFSET(addr);
77
78 if ((u32)addr & ADDR_ZERO_MASK)
79 goto invalid_address;
80 switch (base) {
81 case USB_BASE:
82 break;
83 case CR_BASE:
84 if (offset > CR_MAX_OFFSET) {
85 dev_dbg(zd_usb_dev(usb),
86 "CR offset %#010x larger than"
87 " CR_MAX_OFFSET %#10x\n",
88 offset, CR_MAX_OFFSET);
89 goto invalid_address;
90 }
91 if (offset & 1) {
92 dev_dbg(zd_usb_dev(usb),
93 "CR offset %#010x is not a multiple of 2\n",
94 offset);
95 goto invalid_address;
96 }
97 break;
98 case E2P_BASE:
99 if (offset > E2P_MAX_OFFSET) {
100 dev_dbg(zd_usb_dev(usb),
101 "E2P offset %#010x larger than"
102 " E2P_MAX_OFFSET %#010x\n",
103 offset, E2P_MAX_OFFSET);
104 goto invalid_address;
105 }
106 break;
107 case FW_BASE:
108 if (!usb->fw_base_offset) {
109 dev_dbg(zd_usb_dev(usb),
110 "ERROR: fw base offset has not been set\n");
111 return -EAGAIN;
112 }
113 if (offset > FW_MAX_OFFSET) {
114 dev_dbg(zd_usb_dev(usb),
115 "FW offset %#10x is larger than"
116 " FW_MAX_OFFSET %#010x\n",
117 offset, FW_MAX_OFFSET);
118 goto invalid_address;
119 }
120 break;
121 default:
122 dev_dbg(zd_usb_dev(usb),
123 "address has unsupported base %#010x\n", addr);
124 goto invalid_address;
125 }
126
127 return 0;
128invalid_address:
129 dev_dbg(zd_usb_dev(usb),
130 "ERROR: invalid address: %#010x\n", addr);
131 return -EINVAL;
132}
133#endif /* DEBUG */
134
135static u16 usb_addr(struct zd_usb *usb, zd_addr_t addr)
136{
137 u32 base;
138 u16 offset;
139
140 base = ZD_ADDR_BASE(addr);
141 offset = ZD_OFFSET(addr);
142
143 ZD_ASSERT(check_addr(usb, addr) == 0);
144
145 switch (base) {
146 case CR_BASE:
147 offset += CR_BASE_OFFSET;
148 break;
149 case E2P_BASE:
150 offset += E2P_BASE_OFFSET;
151 break;
152 case FW_BASE:
153 offset += usb->fw_base_offset;
154 break;
155 }
156
157 return offset;
158}
159
160/* USB device initialization */
161
162static int request_fw_file(
163 const struct firmware **fw, const char *name, struct device *device)
164{
165 int r;
166
167 dev_dbg_f(device, "fw name %s\n", name);
168
169 r = request_firmware(fw, name, device);
170 if (r)
171 dev_err(device,
172 "Could not load firmware file %s. Error number %d\n",
173 name, r);
174 return r;
175}
176
177static inline u16 get_bcdDevice(const struct usb_device *udev)
178{
179 return le16_to_cpu(udev->descriptor.bcdDevice);
180}
181
182enum upload_code_flags {
183 REBOOT = 1,
184};
185
186/* Ensures that MAX_TRANSFER_SIZE is even. */
187#define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
188
189static int upload_code(struct usb_device *udev,
190 const u8 *data, size_t size, u16 code_offset, int flags)
191{
192 u8 *p;
193 int r;
194
195 /* USB request blocks need "kmalloced" buffers.
196 */
197 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
198 if (!p) {
199 dev_err(&udev->dev, "out of memory\n");
200 r = -ENOMEM;
201 goto error;
202 }
203
204 size &= ~1;
205 while (size > 0) {
206 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
207 size : MAX_TRANSFER_SIZE;
208
209 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
210
211 memcpy(p, data, transfer_size);
212 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
213 USB_REQ_FIRMWARE_DOWNLOAD,
214 USB_DIR_OUT | USB_TYPE_VENDOR,
215 code_offset, 0, p, transfer_size, 1000 /* ms */);
216 if (r < 0) {
217 dev_err(&udev->dev,
218 "USB control request for firmware upload"
219 " failed. Error number %d\n", r);
220 goto error;
221 }
222 transfer_size = r & ~1;
223
224 size -= transfer_size;
225 data += transfer_size;
226 code_offset += transfer_size/sizeof(u16);
227 }
228
229 if (flags & REBOOT) {
230 u8 ret;
231
232 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
233 USB_REQ_FIRMWARE_CONFIRM,
234 USB_DIR_IN | USB_TYPE_VENDOR,
235 0, 0, &ret, sizeof(ret), 5000 /* ms */);
236 if (r != sizeof(ret)) {
237 dev_err(&udev->dev,
238 "control request firmeware confirmation failed."
239 " Return value %d\n", r);
240 if (r >= 0)
241 r = -ENODEV;
242 goto error;
243 }
244 if (ret & 0x80) {
245 dev_err(&udev->dev,
246 "Internal error while downloading."
247 " Firmware confirm return value %#04x\n",
248 (unsigned int)ret);
249 r = -ENODEV;
250 goto error;
251 }
252 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
253 (unsigned int)ret);
254 }
255
256 r = 0;
257error:
258 kfree(p);
259 return r;
260}
261
262static u16 get_word(const void *data, u16 offset)
263{
264 const __le16 *p = data;
265 return le16_to_cpu(p[offset]);
266}
267
268static char *get_fw_name(char *buffer, size_t size, u8 device_type,
269 const char* postfix)
270{
271 scnprintf(buffer, size, "%s%s",
272 device_type == DEVICE_ZD1211B ?
273 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
274 postfix);
275 return buffer;
276}
277
d066c219
DD		 278static int handle_version_mismatch(struct usb_device *udev, u8 device_type,
279 const struct firmware *ub_fw)
280{
281 const struct firmware *ur_fw = NULL;
282 int offset;
283 int r = 0;
284 char fw_name[128];
285
286 r = request_fw_file(&ur_fw,
287 get_fw_name(fw_name, sizeof(fw_name), device_type, "ur"),
288 &udev->dev);
289 if (r)
290 goto error;
291
292 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START_OFFSET,
293 REBOOT);
294 if (r)
295 goto error;
296
297 offset = ((EEPROM_REGS_OFFSET + EEPROM_REGS_SIZE) * sizeof(u16));
298 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
299 E2P_BASE_OFFSET + EEPROM_REGS_SIZE, REBOOT);
300
301 /* At this point, the vendor driver downloads the whole firmware
302 * image, hacks around with version IDs, and uploads it again,
303 * completely overwriting the boot code. We do not do this here as
304 * it is not required on any tested devices, and it is suspected to
305 * cause problems. */
306error:
307 release_firmware(ur_fw);
308 return r;
309}
310
e85d0918
DD		 311static int upload_firmware(struct usb_device *udev, u8 device_type)
312{
313 int r;
314 u16 fw_bcdDevice;
315 u16 bcdDevice;
316 const struct firmware *ub_fw = NULL;
317 const struct firmware *uph_fw = NULL;
318 char fw_name[128];
319
320 bcdDevice = get_bcdDevice(udev);
321
322 r = request_fw_file(&ub_fw,
323 get_fw_name(fw_name, sizeof(fw_name), device_type, "ub"),
324 &udev->dev);
325 if (r)
326 goto error;
327
328 fw_bcdDevice = get_word(ub_fw->data, EEPROM_REGS_OFFSET);
329
e85d0918
DD		 330 if (fw_bcdDevice != bcdDevice) {
331 dev_info(&udev->dev,
d066c219
DD		 332 "firmware version %#06x and device bootcode version "
333 "%#06x differ\n", fw_bcdDevice, bcdDevice);
334 if (bcdDevice <= 0x4313)
335 dev_warn(&udev->dev, "device has old bootcode, please "
336 "report success or failure\n");
337
338 r = handle_version_mismatch(udev, device_type, ub_fw);
339 if (r)
340 goto error;
e85d0918
DD		 341 } else {
342 dev_dbg_f(&udev->dev,
343 "firmware device id %#06x is equal to the "
344 "actual device id\n", fw_bcdDevice);
345 }
346
347
348 r = request_fw_file(&uph_fw,
349 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
350 &udev->dev);
351 if (r)
352 goto error;
353
354 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START_OFFSET,
355 REBOOT);
356 if (r) {
357 dev_err(&udev->dev,
358 "Could not upload firmware code uph. Error number %d\n",
359 r);
360 }
361
362 /* FALL-THROUGH */
363error:
364 release_firmware(ub_fw);
365 release_firmware(uph_fw);
366 return r;
367}
368
e85d0918
DD		 369#define urb_dev(urb) (&(urb)->dev->dev)
370
371static inline void handle_regs_int(struct urb *urb)
372{
373 struct zd_usb *usb = urb->context;
374 struct zd_usb_interrupt *intr = &usb->intr;
375 int len;
376
377 ZD_ASSERT(in_interrupt());
378 spin_lock(&intr->lock);
379
380 if (intr->read_regs_enabled) {
381 intr->read_regs.length = len = urb->actual_length;
382
383 if (len > sizeof(intr->read_regs.buffer))
384 len = sizeof(intr->read_regs.buffer);
385 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
386 intr->read_regs_enabled = 0;
387 complete(&intr->read_regs.completion);
388 goto out;
389 }
390
391 dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
392out:
393 spin_unlock(&intr->lock);
394}
395
396static inline void handle_retry_failed_int(struct urb *urb)
397{
398 dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
399}
400
401
7d12e780 402static void int_urb_complete(struct urb *urb)
e85d0918
DD		 403{
404 int r;
405 struct usb_int_header *hdr;
406
407 switch (urb->status) {
408 case 0:
409 break;
410 case -ESHUTDOWN:
411 case -EINVAL:
412 case -ENODEV:
413 case -ENOENT:
414 case -ECONNRESET:
e85d0918 415 case -EPIPE:
b312d799 416 goto kfree;
e85d0918
DD		 417 default:
418 goto resubmit;
419 }
420
421 if (urb->actual_length < sizeof(hdr)) {
422 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
423 goto resubmit;
424 }
425
426 hdr = urb->transfer_buffer;
427 if (hdr->type != USB_INT_TYPE) {
428 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
429 goto resubmit;
430 }
431
432 switch (hdr->id) {
433 case USB_INT_ID_REGS:
434 handle_regs_int(urb);
435 break;
436 case USB_INT_ID_RETRY_FAILED:
437 handle_retry_failed_int(urb);
438 break;
439 default:
440 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
441 (unsigned int)hdr->id);
442 goto resubmit;
443 }
444
445resubmit:
446 r = usb_submit_urb(urb, GFP_ATOMIC);
447 if (r) {
448 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
449 goto kfree;
450 }
451 return;
452kfree:
453 kfree(urb->transfer_buffer);
454}
455
456static inline int int_urb_interval(struct usb_device *udev)
457{
458 switch (udev->speed) {
459 case USB_SPEED_HIGH:
460 return 4;
461 case USB_SPEED_LOW:
462 return 10;
463 case USB_SPEED_FULL:
464 default:
465 return 1;
466 }
467}
468
469static inline int usb_int_enabled(struct zd_usb *usb)
470{
471 unsigned long flags;
472 struct zd_usb_interrupt *intr = &usb->intr;
473 struct urb *urb;
474
475 spin_lock_irqsave(&intr->lock, flags);
476 urb = intr->urb;
477 spin_unlock_irqrestore(&intr->lock, flags);
478 return urb != NULL;
479}
480
481int zd_usb_enable_int(struct zd_usb *usb)
482{
483 int r;
484 struct usb_device *udev;
485 struct zd_usb_interrupt *intr = &usb->intr;
486 void *transfer_buffer = NULL;
487 struct urb *urb;
488
489 dev_dbg_f(zd_usb_dev(usb), "\n");
490
491 urb = usb_alloc_urb(0, GFP_NOFS);
492 if (!urb) {
493 r = -ENOMEM;
494 goto out;
495 }
496
497 ZD_ASSERT(!irqs_disabled());
498 spin_lock_irq(&intr->lock);
499 if (intr->urb) {
500 spin_unlock_irq(&intr->lock);
501 r = 0;
502 goto error_free_urb;
503 }
504 intr->urb = urb;
505 spin_unlock_irq(&intr->lock);
506
507 /* TODO: make it a DMA buffer */
508 r = -ENOMEM;
509 transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_NOFS);
510 if (!transfer_buffer) {
511 dev_dbg_f(zd_usb_dev(usb),
512 "couldn't allocate transfer_buffer\n");
513 goto error_set_urb_null;
514 }
515
516 udev = zd_usb_to_usbdev(usb);
517 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
518 transfer_buffer, USB_MAX_EP_INT_BUFFER,
519 int_urb_complete, usb,
520 intr->interval);
521
522 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
523 r = usb_submit_urb(urb, GFP_NOFS);
524 if (r) {
525 dev_dbg_f(zd_usb_dev(usb),
526 "Couldn't submit urb. Error number %d\n", r);
527 goto error;
528 }
529
530 return 0;
531error:
532 kfree(transfer_buffer);
533error_set_urb_null:
534 spin_lock_irq(&intr->lock);
535 intr->urb = NULL;
536 spin_unlock_irq(&intr->lock);
537error_free_urb:
538 usb_free_urb(urb);
539out:
540 return r;
541}
542
543void zd_usb_disable_int(struct zd_usb *usb)
544{
545 unsigned long flags;
546 struct zd_usb_interrupt *intr = &usb->intr;
547 struct urb *urb;
548
549 spin_lock_irqsave(&intr->lock, flags);
550 urb = intr->urb;
551 if (!urb) {
552 spin_unlock_irqrestore(&intr->lock, flags);
553 return;
554 }
555 intr->urb = NULL;
556 spin_unlock_irqrestore(&intr->lock, flags);
557
558 usb_kill_urb(urb);
559 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
560 usb_free_urb(urb);
561}
562
563static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
564 unsigned int length)
565{
566 int i;
567 struct zd_mac *mac = zd_usb_to_mac(usb);
568 const struct rx_length_info *length_info;
569
570 if (length < sizeof(struct rx_length_info)) {
571 /* It's not a complete packet anyhow. */
572 return;
573 }
574 length_info = (struct rx_length_info *)
575 (buffer + length - sizeof(struct rx_length_info));
576
577 /* It might be that three frames are merged into a single URB
578 * transaction. We have to check for the length info tag.
579 *
580 * While testing we discovered that length_info might be unaligned,
581 * because if USB transactions are merged, the last packet will not
582 * be padded. Unaligned access might also happen if the length_info
583 * structure is not present.
584 */
b269825b
UK		 585 if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
586 {
e85d0918
DD		 587 unsigned int l, k, n;
588 for (i = 0, l = 0;; i++) {
b269825b 589 k = le16_to_cpu(get_unaligned(&length_info->length[i]));
e85d0918
DD		 590 n = l+k;
591 if (n > length)
592 return;
593 zd_mac_rx(mac, buffer+l, k);
594 if (i >= 2)
595 return;
596 l = (n+3) & ~3;
597 }
598 } else {
599 zd_mac_rx(mac, buffer, length);
600 }
601}
602
7d12e780 603static void rx_urb_complete(struct urb *urb)
e85d0918
DD		 604{
605 struct zd_usb *usb;
606 struct zd_usb_rx *rx;
607 const u8 *buffer;
608 unsigned int length;
609
610 switch (urb->status) {
611 case 0:
612 break;
613 case -ESHUTDOWN:
614 case -EINVAL:
615 case -ENODEV:
616 case -ENOENT:
617 case -ECONNRESET:
e85d0918 618 case -EPIPE:
b312d799 619 return;
e85d0918
DD		 620 default:
621 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
622 goto resubmit;
623 }
624
625 buffer = urb->transfer_buffer;
626 length = urb->actual_length;
627 usb = urb->context;
628 rx = &usb->rx;
629
630 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
631 /* If there is an old first fragment, we don't care. */
632 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
633 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
634 spin_lock(&rx->lock);
635 memcpy(rx->fragment, buffer, length);
636 rx->fragment_length = length;
637 spin_unlock(&rx->lock);
638 goto resubmit;
639 }
640
641 spin_lock(&rx->lock);
642 if (rx->fragment_length > 0) {
643 /* We are on a second fragment, we believe */
644 ZD_ASSERT(length + rx->fragment_length <=
645 ARRAY_SIZE(rx->fragment));
646 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
647 memcpy(rx->fragment+rx->fragment_length, buffer, length);
648 handle_rx_packet(usb, rx->fragment,
649 rx->fragment_length + length);
650 rx->fragment_length = 0;
651 spin_unlock(&rx->lock);
652 } else {
653 spin_unlock(&rx->lock);
654 handle_rx_packet(usb, buffer, length);
655 }
656
657resubmit:
658 usb_submit_urb(urb, GFP_ATOMIC);
659}
660
c48cf125 661static struct urb *alloc_urb(struct zd_usb *usb)
e85d0918
DD		 662{
663 struct usb_device *udev = zd_usb_to_usbdev(usb);
664 struct urb *urb;
665 void *buffer;
666
667 urb = usb_alloc_urb(0, GFP_NOFS);
668 if (!urb)
669 return NULL;
670 buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS,
671 &urb->transfer_dma);
672 if (!buffer) {
673 usb_free_urb(urb);
674 return NULL;
675 }
676
677 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
678 buffer, USB_MAX_RX_SIZE,
679 rx_urb_complete, usb);
680 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
681
682 return urb;
683}
684
c48cf125 685static void free_urb(struct urb *urb)
e85d0918
DD		 686{
687 if (!urb)
688 return;
689 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
690 urb->transfer_buffer, urb->transfer_dma);
691 usb_free_urb(urb);
692}
693
694int zd_usb_enable_rx(struct zd_usb *usb)
695{
696 int i, r;
697 struct zd_usb_rx *rx = &usb->rx;
698 struct urb **urbs;
699
700 dev_dbg_f(zd_usb_dev(usb), "\n");
701
702 r = -ENOMEM;
703 urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS);
704 if (!urbs)
705 goto error;
706 for (i = 0; i < URBS_COUNT; i++) {
707 urbs[i] = alloc_urb(usb);
708 if (!urbs[i])
709 goto error;
710 }
711
712 ZD_ASSERT(!irqs_disabled());
713 spin_lock_irq(&rx->lock);
714 if (rx->urbs) {
715 spin_unlock_irq(&rx->lock);
716 r = 0;
717 goto error;
718 }
719 rx->urbs = urbs;
720 rx->urbs_count = URBS_COUNT;
721 spin_unlock_irq(&rx->lock);
722
723 for (i = 0; i < URBS_COUNT; i++) {
724 r = usb_submit_urb(urbs[i], GFP_NOFS);
725 if (r)
726 goto error_submit;
727 }
728
729 return 0;
730error_submit:
731 for (i = 0; i < URBS_COUNT; i++) {
732 usb_kill_urb(urbs[i]);
733 }
734 spin_lock_irq(&rx->lock);
735 rx->urbs = NULL;
736 rx->urbs_count = 0;
737 spin_unlock_irq(&rx->lock);
738error:
739 if (urbs) {
740 for (i = 0; i < URBS_COUNT; i++)
741 free_urb(urbs[i]);
742 }
743 return r;
744}
745
746void zd_usb_disable_rx(struct zd_usb *usb)
747{
748 int i;
749 unsigned long flags;
750 struct urb **urbs;
751 unsigned int count;
752 struct zd_usb_rx *rx = &usb->rx;
753
754 spin_lock_irqsave(&rx->lock, flags);
755 urbs = rx->urbs;
756 count = rx->urbs_count;
757 spin_unlock_irqrestore(&rx->lock, flags);
758 if (!urbs)
759 return;
760
761 for (i = 0; i < count; i++) {
762 usb_kill_urb(urbs[i]);
763 free_urb(urbs[i]);
764 }
765 kfree(urbs);
766
767 spin_lock_irqsave(&rx->lock, flags);
768 rx->urbs = NULL;
769 rx->urbs_count = 0;
770 spin_unlock_irqrestore(&rx->lock, flags);
771}
772
7d12e780 773static void tx_urb_complete(struct urb *urb)
e85d0918
DD		 774{
775 int r;
776
777 switch (urb->status) {
778 case 0:
779 break;
780 case -ESHUTDOWN:
781 case -EINVAL:
782 case -ENODEV:
783 case -ENOENT:
784 case -ECONNRESET:
b312d799 785 case -EPIPE:
e85d0918
DD		 786 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
787 break;
e85d0918
DD		 788 default:
789 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
790 goto resubmit;
791 }
792free_urb:
793 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
794 urb->transfer_buffer, urb->transfer_dma);
795 usb_free_urb(urb);
796 return;
797resubmit:
798 r = usb_submit_urb(urb, GFP_ATOMIC);
799 if (r) {
800 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
801 goto free_urb;
802 }
803}
804
805/* Puts the frame on the USB endpoint. It doesn't wait for
806 * completion. The frame must contain the control set.
807 */
808int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
809{
810 int r;
811 struct usb_device *udev = zd_usb_to_usbdev(usb);
812 struct urb *urb;
813 void *buffer;
814
815 urb = usb_alloc_urb(0, GFP_ATOMIC);
816 if (!urb) {
817 r = -ENOMEM;
818 goto out;
819 }
820
821 buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
822 &urb->transfer_dma);
823 if (!buffer) {
824 r = -ENOMEM;
825 goto error_free_urb;
826 }
827 memcpy(buffer, frame, length);
828
829 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
830 buffer, length, tx_urb_complete, NULL);
831 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
832
833 r = usb_submit_urb(urb, GFP_ATOMIC);
834 if (r)
835 goto error;
836 return 0;
837error:
838 usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
839 urb->transfer_dma);
840error_free_urb:
841 usb_free_urb(urb);
842out:
843 return r;
844}
845
846static inline void init_usb_interrupt(struct zd_usb *usb)
847{
848 struct zd_usb_interrupt *intr = &usb->intr;
849
850 spin_lock_init(&intr->lock);
851 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
852 init_completion(&intr->read_regs.completion);
853 intr->read_regs.cr_int_addr = cpu_to_le16(usb_addr(usb, CR_INTERRUPT));
854}
855
856static inline void init_usb_rx(struct zd_usb *usb)
857{
858 struct zd_usb_rx *rx = &usb->rx;
859 spin_lock_init(&rx->lock);
860 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
861 rx->usb_packet_size = 512;
862 } else {
863 rx->usb_packet_size = 64;
864 }
865 ZD_ASSERT(rx->fragment_length == 0);
866}
867
868static inline void init_usb_tx(struct zd_usb *usb)
869{
870 /* FIXME: at this point we will allocate a fixed number of urb's for
871 * use in a cyclic scheme */
872}
873
874void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
875 struct usb_interface *intf)
876{
877 memset(usb, 0, sizeof(*usb));
878 usb->intf = usb_get_intf(intf);
879 usb_set_intfdata(usb->intf, netdev);
880 init_usb_interrupt(usb);
881 init_usb_tx(usb);
882 init_usb_rx(usb);
883}
884
885int zd_usb_init_hw(struct zd_usb *usb)
886{
887 int r;
888 struct zd_chip *chip = zd_usb_to_chip(usb);
889
890 ZD_ASSERT(mutex_is_locked(&chip->mutex));
891 r = zd_ioread16_locked(chip, &usb->fw_base_offset,
892 USB_REG((u16)FW_BASE_ADDR_OFFSET));
893 if (r)
894 return r;
895 dev_dbg_f(zd_usb_dev(usb), "fw_base_offset: %#06hx\n",
896 usb->fw_base_offset);
897
898 return 0;
899}
900
901void zd_usb_clear(struct zd_usb *usb)
902{
903 usb_set_intfdata(usb->intf, NULL);
904 usb_put_intf(usb->intf);
c48cf125 905 ZD_MEMCLEAR(usb, sizeof(*usb));
e85d0918
DD		 906 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
907}
908
909static const char *speed(enum usb_device_speed speed)
910{
911 switch (speed) {
912 case USB_SPEED_LOW:
913 return "low";
914 case USB_SPEED_FULL:
915 return "full";
916 case USB_SPEED_HIGH:
917 return "high";
918 default:
919 return "unknown speed";
920 }
921}
922
923static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
924{
925 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
926 le16_to_cpu(udev->descriptor.idVendor),
927 le16_to_cpu(udev->descriptor.idProduct),
928 get_bcdDevice(udev),
929 speed(udev->speed));
930}
931
932int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
933{
934 struct usb_device *udev = interface_to_usbdev(usb->intf);
935 return scnprint_id(udev, buffer, size);
936}
937
938#ifdef DEBUG
939static void print_id(struct usb_device *udev)
940{
941 char buffer[40];
942
943 scnprint_id(udev, buffer, sizeof(buffer));
944 buffer[sizeof(buffer)-1] = 0;
945 dev_dbg_f(&udev->dev, "%s\n", buffer);
946}
947#else
948#define print_id(udev) do { } while (0)
949#endif
950
a1030e92
DD		 951static int eject_installer(struct usb_interface *intf)
952{
953 struct usb_device *udev = interface_to_usbdev(intf);
954 struct usb_host_interface *iface_desc = &intf->altsetting[0];
955 struct usb_endpoint_descriptor *endpoint;
956 unsigned char *cmd;
957 u8 bulk_out_ep;
958 int r;
959
960 /* Find bulk out endpoint */
961 endpoint = &iface_desc->endpoint[1].desc;
962 if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
963 (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
964 USB_ENDPOINT_XFER_BULK) {
965 bulk_out_ep = endpoint->bEndpointAddress;
966 } else {
967 dev_err(&udev->dev,
968 "zd1211rw: Could not find bulk out endpoint\n");
969 return -ENODEV;
970 }
971
972 cmd = kzalloc(31, GFP_KERNEL);
973 if (cmd == NULL)
974 return -ENODEV;
975
976 /* USB bulk command block */
977 cmd[0] = 0x55; /* bulk command signature */
978 cmd[1] = 0x53; /* bulk command signature */
979 cmd[2] = 0x42; /* bulk command signature */
980 cmd[3] = 0x43; /* bulk command signature */
981 cmd[14] = 6; /* command length */
982
983 cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
984 cmd[19] = 0x2; /* eject disc */
985
986 dev_info(&udev->dev, "Ejecting virtual installer media...\n");
987 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
988 cmd, 31, NULL, 2000);
989 kfree(cmd);
990 if (r)
991 return r;
992
993 /* At this point, the device disconnects and reconnects with the real
994 * ID numbers. */
995
996 usb_set_intfdata(intf, NULL);
997 return 0;
998}
999
e85d0918
DD		 1000static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1001{
1002 int r;
1003 struct usb_device *udev = interface_to_usbdev(intf);
1004 struct net_device *netdev = NULL;
1005
1006 print_id(udev);
1007
a1030e92
DD		 1008 if (id->driver_info & DEVICE_INSTALLER)
1009 return eject_installer(intf);
1010
e85d0918
DD		 1011 switch (udev->speed) {
1012 case USB_SPEED_LOW:
1013 case USB_SPEED_FULL:
1014 case USB_SPEED_HIGH:
1015 break;
1016 default:
1017 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1018 r = -ENODEV;
1019 goto error;
1020 }
1021
1022 netdev = zd_netdev_alloc(intf);
1023 if (netdev == NULL) {
1024 r = -ENOMEM;
1025 goto error;
1026 }
1027
1028 r = upload_firmware(udev, id->driver_info);
1029 if (r) {
1030 dev_err(&intf->dev,
1031 "couldn't load firmware. Error number %d\n", r);
1032 goto error;
1033 }
1034
1035 r = usb_reset_configuration(udev);
1036 if (r) {
1037 dev_dbg_f(&intf->dev,
1038 "couldn't reset configuration. Error number %d\n", r);
1039 goto error;
1040 }
1041
1042 /* At this point the interrupt endpoint is not generally enabled. We
1043 * save the USB bandwidth until the network device is opened. But
1044 * notify that the initialization of the MAC will require the
1045 * interrupts to be temporary enabled.
1046 */
1047 r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
1048 if (r) {
1049 dev_dbg_f(&intf->dev,
1050 "couldn't initialize mac. Error number %d\n", r);
1051 goto error;
1052 }
1053
1054 r = register_netdev(netdev);
1055 if (r) {
1056 dev_dbg_f(&intf->dev,
1057 "couldn't register netdev. Error number %d\n", r);
1058 goto error;
1059 }
1060
1061 dev_dbg_f(&intf->dev, "successful\n");
1062 dev_info(&intf->dev,"%s\n", netdev->name);
1063 return 0;
1064error:
1065 usb_reset_device(interface_to_usbdev(intf));
1066 zd_netdev_free(netdev);
1067 return r;
1068}
1069
1070static void disconnect(struct usb_interface *intf)
1071{
1072 struct net_device *netdev = zd_intf_to_netdev(intf);
1073 struct zd_mac *mac = zd_netdev_mac(netdev);
1074 struct zd_usb *usb = &mac->chip.usb;
1075
a1030e92
DD		 1076 /* Either something really bad happened, or we're just dealing with
1077 * a DEVICE_INSTALLER. */
1078 if (netdev == NULL)
1079 return;
1080
e85d0918
DD		 1081 dev_dbg_f(zd_usb_dev(usb), "\n");
1082
1083 zd_netdev_disconnect(netdev);
1084
1085 /* Just in case something has gone wrong! */
1086 zd_usb_disable_rx(usb);
1087 zd_usb_disable_int(usb);
1088
1089 /* If the disconnect has been caused by a removal of the
1090 * driver module, the reset allows reloading of the driver. If the
1091 * reset will not be executed here, the upload of the firmware in the
1092 * probe function caused by the reloading of the driver will fail.
1093 */
1094 usb_reset_device(interface_to_usbdev(intf));
1095
e85d0918
DD		 1096 zd_netdev_free(netdev);
1097 dev_dbg(&intf->dev, "disconnected\n");
1098}
1099
1100static struct usb_driver driver = {
1101 .name = "zd1211rw",
1102 .id_table = usb_ids,
1103 .probe = probe,
1104 .disconnect = disconnect,
1105};
1106
bc5f06a8
UK		 1107struct workqueue_struct *zd_workqueue;
1108
e85d0918
DD		 1109static int __init usb_init(void)
1110{
1111 int r;
1112
1113 pr_debug("usb_init()\n");
1114
bc5f06a8
UK		 1115 zd_workqueue = create_singlethread_workqueue(driver.name);
1116 if (zd_workqueue == NULL) {
1117 printk(KERN_ERR "%s: couldn't create workqueue\n", driver.name);
1118 return -ENOMEM;
1119 }
1120
e85d0918
DD		 1121 r = usb_register(&driver);
1122 if (r) {
1123 printk(KERN_ERR "usb_register() failed. Error number %d\n", r);
1124 return r;
1125 }
1126
1127 pr_debug("zd1211rw initialized\n");
1128 return 0;
1129}
1130
1131static void __exit usb_exit(void)
1132{
1133 pr_debug("usb_exit()\n");
1134 usb_deregister(&driver);
bc5f06a8 1135 destroy_workqueue(zd_workqueue);
e85d0918
DD		 1136}
1137
1138module_init(usb_init);
1139module_exit(usb_exit);
1140
1141static int usb_int_regs_length(unsigned int count)
1142{
1143 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1144}
1145
1146static void prepare_read_regs_int(struct zd_usb *usb)
1147{
1148 struct zd_usb_interrupt *intr = &usb->intr;
1149
a68077de 1150 spin_lock_irq(&intr->lock);
e85d0918
DD		 1151 intr->read_regs_enabled = 1;
1152 INIT_COMPLETION(intr->read_regs.completion);
a68077de
UK		 1153 spin_unlock_irq(&intr->lock);
1154}
1155
1156static void disable_read_regs_int(struct zd_usb *usb)
1157{
1158 struct zd_usb_interrupt *intr = &usb->intr;
1159
1160 spin_lock_irq(&intr->lock);
1161 intr->read_regs_enabled = 0;
1162 spin_unlock_irq(&intr->lock);
e85d0918
DD		 1163}
1164
1165static int get_results(struct zd_usb *usb, u16 *values,
1166 struct usb_req_read_regs *req, unsigned int count)
1167{
1168 int r;
1169 int i;
1170 struct zd_usb_interrupt *intr = &usb->intr;
1171 struct read_regs_int *rr = &intr->read_regs;
1172 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1173
a68077de 1174 spin_lock_irq(&intr->lock);
e85d0918
DD		 1175
1176 r = -EIO;
1177 /* The created block size seems to be larger than expected.
1178 * However results appear to be correct.
1179 */
1180 if (rr->length < usb_int_regs_length(count)) {
1181 dev_dbg_f(zd_usb_dev(usb),
1182 "error: actual length %d less than expected %d\n",
1183 rr->length, usb_int_regs_length(count));
1184 goto error_unlock;
1185 }
1186 if (rr->length > sizeof(rr->buffer)) {
1187 dev_dbg_f(zd_usb_dev(usb),
1188 "error: actual length %d exceeds buffer size %zu\n",
1189 rr->length, sizeof(rr->buffer));
1190 goto error_unlock;
1191 }
1192
1193 for (i = 0; i < count; i++) {
1194 struct reg_data *rd = &regs->regs[i];
1195 if (rd->addr != req->addr[i]) {
1196 dev_dbg_f(zd_usb_dev(usb),
1197 "rd[%d] addr %#06hx expected %#06hx\n", i,
1198 le16_to_cpu(rd->addr),
1199 le16_to_cpu(req->addr[i]));
1200 goto error_unlock;
1201 }
1202 values[i] = le16_to_cpu(rd->value);
1203 }
1204
1205 r = 0;
1206error_unlock:
a68077de 1207 spin_unlock_irq(&intr->lock);
e85d0918
DD		 1208 return r;
1209}
1210
1211int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1212 const zd_addr_t *addresses, unsigned int count)
1213{
1214 int r;
1215 int i, req_len, actual_req_len;
1216 struct usb_device *udev;
1217 struct usb_req_read_regs *req = NULL;
1218 unsigned long timeout;
1219
1220 if (count < 1) {
1221 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1222 return -EINVAL;
1223 }
1224 if (count > USB_MAX_IOREAD16_COUNT) {
1225 dev_dbg_f(zd_usb_dev(usb),
1226 "error: count %u exceeds possible max %u\n",
1227 count, USB_MAX_IOREAD16_COUNT);
1228 return -EINVAL;
1229 }
1230 if (in_atomic()) {
1231 dev_dbg_f(zd_usb_dev(usb),
1232 "error: io in atomic context not supported\n");
1233 return -EWOULDBLOCK;
1234 }
1235 if (!usb_int_enabled(usb)) {
1236 dev_dbg_f(zd_usb_dev(usb),
1237 "error: usb interrupt not enabled\n");
1238 return -EWOULDBLOCK;
1239 }
1240
1241 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1242 req = kmalloc(req_len, GFP_NOFS);
1243 if (!req)
1244 return -ENOMEM;
1245 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1246 for (i = 0; i < count; i++)
1247 req->addr[i] = cpu_to_le16(usb_addr(usb, addresses[i]));
1248
1249 udev = zd_usb_to_usbdev(usb);
1250 prepare_read_regs_int(usb);
1251 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1252 req, req_len, &actual_req_len, 1000 /* ms */);
1253 if (r) {
1254 dev_dbg_f(zd_usb_dev(usb),
1255 "error in usb_bulk_msg(). Error number %d\n", r);
1256 goto error;
1257 }
1258 if (req_len != actual_req_len) {
1259 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1260 " req_len %d != actual_req_len %d\n",
1261 req_len, actual_req_len);
1262 r = -EIO;
1263 goto error;
1264 }
1265
1266 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1267 msecs_to_jiffies(1000));
1268 if (!timeout) {
1269 disable_read_regs_int(usb);
1270 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1271 r = -ETIMEDOUT;
1272 goto error;
1273 }
1274
1275 r = get_results(usb, values, req, count);
1276error:
1277 kfree(req);
1278 return r;
1279}
1280
1281int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1282 unsigned int count)
1283{
1284 int r;
1285 struct usb_device *udev;
1286 struct usb_req_write_regs *req = NULL;
1287 int i, req_len, actual_req_len;
1288
1289 if (count == 0)
1290 return 0;
1291 if (count > USB_MAX_IOWRITE16_COUNT) {
1292 dev_dbg_f(zd_usb_dev(usb),
1293 "error: count %u exceeds possible max %u\n",
1294 count, USB_MAX_IOWRITE16_COUNT);
1295 return -EINVAL;
1296 }
1297 if (in_atomic()) {
1298 dev_dbg_f(zd_usb_dev(usb),
1299 "error: io in atomic context not supported\n");
1300 return -EWOULDBLOCK;
1301 }
1302
1303 req_len = sizeof(struct usb_req_write_regs) +
1304 count * sizeof(struct reg_data);
1305 req = kmalloc(req_len, GFP_NOFS);
1306 if (!req)
1307 return -ENOMEM;
1308
1309 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1310 for (i = 0; i < count; i++) {
1311 struct reg_data *rw = &req->reg_writes[i];
1312 rw->addr = cpu_to_le16(usb_addr(usb, ioreqs[i].addr));
1313 rw->value = cpu_to_le16(ioreqs[i].value);
1314 }
1315
1316 udev = zd_usb_to_usbdev(usb);
1317 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1318 req, req_len, &actual_req_len, 1000 /* ms */);
1319 if (r) {
1320 dev_dbg_f(zd_usb_dev(usb),
1321 "error in usb_bulk_msg(). Error number %d\n", r);
1322 goto error;
1323 }
1324 if (req_len != actual_req_len) {
1325 dev_dbg_f(zd_usb_dev(usb),
1326 "error in usb_bulk_msg()"
1327 " req_len %d != actual_req_len %d\n",
1328 req_len, actual_req_len);
1329 r = -EIO;
1330 goto error;
1331 }
1332
1333 /* FALL-THROUGH with r == 0 */
1334error:
1335 kfree(req);
1336 return r;
1337}
1338
1339int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1340{
1341 int r;
1342 struct usb_device *udev;
1343 struct usb_req_rfwrite *req = NULL;
1344 int i, req_len, actual_req_len;
1345 u16 bit_value_template;
1346
1347 if (in_atomic()) {
1348 dev_dbg_f(zd_usb_dev(usb),
1349 "error: io in atomic context not supported\n");
1350 return -EWOULDBLOCK;
1351 }
1352 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1353 dev_dbg_f(zd_usb_dev(usb),
1354 "error: bits %d are smaller than"
1355 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1356 bits, USB_MIN_RFWRITE_BIT_COUNT);
1357 return -EINVAL;
1358 }
1359 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1360 dev_dbg_f(zd_usb_dev(usb),
1361 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1362 bits, USB_MAX_RFWRITE_BIT_COUNT);
1363 return -EINVAL;
1364 }
1365#ifdef DEBUG
1366 if (value & (~0UL << bits)) {
1367 dev_dbg_f(zd_usb_dev(usb),
1368 "error: value %#09x has bits >= %d set\n",
1369 value, bits);
1370 return -EINVAL;
1371 }
1372#endif /* DEBUG */
1373
1374 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1375
1376 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1377 if (r) {
1378 dev_dbg_f(zd_usb_dev(usb),
1379 "error %d: Couldn't read CR203\n", r);
1380 goto out;
1381 }
1382 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1383
1384 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1385 req = kmalloc(req_len, GFP_NOFS);
1386 if (!req)
1387 return -ENOMEM;
1388
1389 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1390 /* 1: 3683a, but not used in ZYDAS driver */
1391 req->value = cpu_to_le16(2);
1392 req->bits = cpu_to_le16(bits);
1393
1394 for (i = 0; i < bits; i++) {
1395 u16 bv = bit_value_template;
1396 if (value & (1 << (bits-1-i)))
1397 bv |= RF_DATA;
1398 req->bit_values[i] = cpu_to_le16(bv);
1399 }
1400
1401 udev = zd_usb_to_usbdev(usb);
1402 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1403 req, req_len, &actual_req_len, 1000 /* ms */);
1404 if (r) {
1405 dev_dbg_f(zd_usb_dev(usb),
1406 "error in usb_bulk_msg(). Error number %d\n", r);
1407 goto out;
1408 }
1409 if (req_len != actual_req_len) {
1410 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1411 " req_len %d != actual_req_len %d\n",
1412 req_len, actual_req_len);
1413 r = -EIO;
1414 goto out;
1415 }
1416
1417 /* FALL-THROUGH with r == 0 */
1418out:
1419 kfree(req);
1420 return r;
1421}
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