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[PATCH] bcm43xx: Enable fwpostfix in nondebug bcm43xx
[mirror_ubuntu-bionic-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 },
a1030e92
DD		 61 /* "Driverless" devices that need ejecting */
62 { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
e85d0918
DD		 63 {}
64};
65
66MODULE_LICENSE("GPL");
67MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
68MODULE_AUTHOR("Ulrich Kunitz");
69MODULE_AUTHOR("Daniel Drake");
70MODULE_VERSION("1.0");
71MODULE_DEVICE_TABLE(usb, usb_ids);
72
73#define FW_ZD1211_PREFIX "zd1211/zd1211_"
74#define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
75
76/* register address handling */
77
78#ifdef DEBUG
79static int check_addr(struct zd_usb *usb, zd_addr_t addr)
80{
81 u32 base = ZD_ADDR_BASE(addr);
82 u32 offset = ZD_OFFSET(addr);
83
84 if ((u32)addr & ADDR_ZERO_MASK)
85 goto invalid_address;
86 switch (base) {
87 case USB_BASE:
88 break;
89 case CR_BASE:
90 if (offset > CR_MAX_OFFSET) {
91 dev_dbg(zd_usb_dev(usb),
92 "CR offset %#010x larger than"
93 " CR_MAX_OFFSET %#10x\n",
94 offset, CR_MAX_OFFSET);
95 goto invalid_address;
96 }
97 if (offset & 1) {
98 dev_dbg(zd_usb_dev(usb),
99 "CR offset %#010x is not a multiple of 2\n",
100 offset);
101 goto invalid_address;
102 }
103 break;
104 case E2P_BASE:
105 if (offset > E2P_MAX_OFFSET) {
106 dev_dbg(zd_usb_dev(usb),
107 "E2P offset %#010x larger than"
108 " E2P_MAX_OFFSET %#010x\n",
109 offset, E2P_MAX_OFFSET);
110 goto invalid_address;
111 }
112 break;
113 case FW_BASE:
114 if (!usb->fw_base_offset) {
115 dev_dbg(zd_usb_dev(usb),
116 "ERROR: fw base offset has not been set\n");
117 return -EAGAIN;
118 }
119 if (offset > FW_MAX_OFFSET) {
120 dev_dbg(zd_usb_dev(usb),
121 "FW offset %#10x is larger than"
122 " FW_MAX_OFFSET %#010x\n",
123 offset, FW_MAX_OFFSET);
124 goto invalid_address;
125 }
126 break;
127 default:
128 dev_dbg(zd_usb_dev(usb),
129 "address has unsupported base %#010x\n", addr);
130 goto invalid_address;
131 }
132
133 return 0;
134invalid_address:
135 dev_dbg(zd_usb_dev(usb),
136 "ERROR: invalid address: %#010x\n", addr);
137 return -EINVAL;
138}
139#endif /* DEBUG */
140
141static u16 usb_addr(struct zd_usb *usb, zd_addr_t addr)
142{
143 u32 base;
144 u16 offset;
145
146 base = ZD_ADDR_BASE(addr);
147 offset = ZD_OFFSET(addr);
148
149 ZD_ASSERT(check_addr(usb, addr) == 0);
150
151 switch (base) {
152 case CR_BASE:
153 offset += CR_BASE_OFFSET;
154 break;
155 case E2P_BASE:
156 offset += E2P_BASE_OFFSET;
157 break;
158 case FW_BASE:
159 offset += usb->fw_base_offset;
160 break;
161 }
162
163 return offset;
164}
165
166/* USB device initialization */
167
168static int request_fw_file(
169 const struct firmware **fw, const char *name, struct device *device)
170{
171 int r;
172
173 dev_dbg_f(device, "fw name %s\n", name);
174
175 r = request_firmware(fw, name, device);
176 if (r)
177 dev_err(device,
178 "Could not load firmware file %s. Error number %d\n",
179 name, r);
180 return r;
181}
182
183static inline u16 get_bcdDevice(const struct usb_device *udev)
184{
185 return le16_to_cpu(udev->descriptor.bcdDevice);
186}
187
188enum upload_code_flags {
189 REBOOT = 1,
190};
191
192/* Ensures that MAX_TRANSFER_SIZE is even. */
193#define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
194
195static int upload_code(struct usb_device *udev,
196 const u8 *data, size_t size, u16 code_offset, int flags)
197{
198 u8 *p;
199 int r;
200
201 /* USB request blocks need "kmalloced" buffers.
202 */
203 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
204 if (!p) {
205 dev_err(&udev->dev, "out of memory\n");
206 r = -ENOMEM;
207 goto error;
208 }
209
210 size &= ~1;
211 while (size > 0) {
212 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
213 size : MAX_TRANSFER_SIZE;
214
215 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
216
217 memcpy(p, data, transfer_size);
218 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
219 USB_REQ_FIRMWARE_DOWNLOAD,
220 USB_DIR_OUT | USB_TYPE_VENDOR,
221 code_offset, 0, p, transfer_size, 1000 /* ms */);
222 if (r < 0) {
223 dev_err(&udev->dev,
224 "USB control request for firmware upload"
225 " failed. Error number %d\n", r);
226 goto error;
227 }
228 transfer_size = r & ~1;
229
230 size -= transfer_size;
231 data += transfer_size;
232 code_offset += transfer_size/sizeof(u16);
233 }
234
235 if (flags & REBOOT) {
236 u8 ret;
237
238 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
239 USB_REQ_FIRMWARE_CONFIRM,
240 USB_DIR_IN | USB_TYPE_VENDOR,
241 0, 0, &ret, sizeof(ret), 5000 /* ms */);
242 if (r != sizeof(ret)) {
243 dev_err(&udev->dev,
244 "control request firmeware confirmation failed."
245 " Return value %d\n", r);
246 if (r >= 0)
247 r = -ENODEV;
248 goto error;
249 }
250 if (ret & 0x80) {
251 dev_err(&udev->dev,
252 "Internal error while downloading."
253 " Firmware confirm return value %#04x\n",
254 (unsigned int)ret);
255 r = -ENODEV;
256 goto error;
257 }
258 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
259 (unsigned int)ret);
260 }
261
262 r = 0;
263error:
264 kfree(p);
265 return r;
266}
267
268static u16 get_word(const void *data, u16 offset)
269{
270 const __le16 *p = data;
271 return le16_to_cpu(p[offset]);
272}
273
274static char *get_fw_name(char *buffer, size_t size, u8 device_type,
275 const char* postfix)
276{
277 scnprintf(buffer, size, "%s%s",
278 device_type == DEVICE_ZD1211B ?
279 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
280 postfix);
281 return buffer;
282}
283
d066c219
DD		 284static int handle_version_mismatch(struct usb_device *udev, u8 device_type,
285 const struct firmware *ub_fw)
286{
287 const struct firmware *ur_fw = NULL;
288 int offset;
289 int r = 0;
290 char fw_name[128];
291
292 r = request_fw_file(&ur_fw,
293 get_fw_name(fw_name, sizeof(fw_name), device_type, "ur"),
294 &udev->dev);
295 if (r)
296 goto error;
297
298 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START_OFFSET,
299 REBOOT);
300 if (r)
301 goto error;
302
303 offset = ((EEPROM_REGS_OFFSET + EEPROM_REGS_SIZE) * sizeof(u16));
304 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
305 E2P_BASE_OFFSET + EEPROM_REGS_SIZE, REBOOT);
306
307 /* At this point, the vendor driver downloads the whole firmware
308 * image, hacks around with version IDs, and uploads it again,
309 * completely overwriting the boot code. We do not do this here as
310 * it is not required on any tested devices, and it is suspected to
311 * cause problems. */
312error:
313 release_firmware(ur_fw);
314 return r;
315}
316
e85d0918
DD		 317static int upload_firmware(struct usb_device *udev, u8 device_type)
318{
319 int r;
320 u16 fw_bcdDevice;
321 u16 bcdDevice;
322 const struct firmware *ub_fw = NULL;
323 const struct firmware *uph_fw = NULL;
324 char fw_name[128];
325
326 bcdDevice = get_bcdDevice(udev);
327
328 r = request_fw_file(&ub_fw,
329 get_fw_name(fw_name, sizeof(fw_name), device_type, "ub"),
330 &udev->dev);
331 if (r)
332 goto error;
333
334 fw_bcdDevice = get_word(ub_fw->data, EEPROM_REGS_OFFSET);
335
e85d0918
DD		 336 if (fw_bcdDevice != bcdDevice) {
337 dev_info(&udev->dev,
d066c219
DD		 338 "firmware version %#06x and device bootcode version "
339 "%#06x differ\n", fw_bcdDevice, bcdDevice);
340 if (bcdDevice <= 0x4313)
341 dev_warn(&udev->dev, "device has old bootcode, please "
342 "report success or failure\n");
343
344 r = handle_version_mismatch(udev, device_type, ub_fw);
345 if (r)
346 goto error;
e85d0918
DD		 347 } else {
348 dev_dbg_f(&udev->dev,
349 "firmware device id %#06x is equal to the "
350 "actual device id\n", fw_bcdDevice);
351 }
352
353
354 r = request_fw_file(&uph_fw,
355 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
356 &udev->dev);
357 if (r)
358 goto error;
359
360 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START_OFFSET,
361 REBOOT);
362 if (r) {
363 dev_err(&udev->dev,
364 "Could not upload firmware code uph. Error number %d\n",
365 r);
366 }
367
368 /* FALL-THROUGH */
369error:
370 release_firmware(ub_fw);
371 release_firmware(uph_fw);
372 return r;
373}
374
e85d0918
DD		 375#define urb_dev(urb) (&(urb)->dev->dev)
376
377static inline void handle_regs_int(struct urb *urb)
378{
379 struct zd_usb *usb = urb->context;
380 struct zd_usb_interrupt *intr = &usb->intr;
381 int len;
382
383 ZD_ASSERT(in_interrupt());
384 spin_lock(&intr->lock);
385
386 if (intr->read_regs_enabled) {
387 intr->read_regs.length = len = urb->actual_length;
388
389 if (len > sizeof(intr->read_regs.buffer))
390 len = sizeof(intr->read_regs.buffer);
391 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
392 intr->read_regs_enabled = 0;
393 complete(&intr->read_regs.completion);
394 goto out;
395 }
396
397 dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
398out:
399 spin_unlock(&intr->lock);
400}
401
402static inline void handle_retry_failed_int(struct urb *urb)
403{
404 dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
405}
406
407
7d12e780 408static void int_urb_complete(struct urb *urb)
e85d0918
DD		 409{
410 int r;
411 struct usb_int_header *hdr;
412
413 switch (urb->status) {
414 case 0:
415 break;
416 case -ESHUTDOWN:
417 case -EINVAL:
418 case -ENODEV:
419 case -ENOENT:
420 case -ECONNRESET:
e85d0918 421 case -EPIPE:
b312d799 422 goto kfree;
e85d0918
DD		 423 default:
424 goto resubmit;
425 }
426
427 if (urb->actual_length < sizeof(hdr)) {
428 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
429 goto resubmit;
430 }
431
432 hdr = urb->transfer_buffer;
433 if (hdr->type != USB_INT_TYPE) {
434 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
435 goto resubmit;
436 }
437
438 switch (hdr->id) {
439 case USB_INT_ID_REGS:
440 handle_regs_int(urb);
441 break;
442 case USB_INT_ID_RETRY_FAILED:
443 handle_retry_failed_int(urb);
444 break;
445 default:
446 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
447 (unsigned int)hdr->id);
448 goto resubmit;
449 }
450
451resubmit:
452 r = usb_submit_urb(urb, GFP_ATOMIC);
453 if (r) {
454 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
455 goto kfree;
456 }
457 return;
458kfree:
459 kfree(urb->transfer_buffer);
460}
461
462static inline int int_urb_interval(struct usb_device *udev)
463{
464 switch (udev->speed) {
465 case USB_SPEED_HIGH:
466 return 4;
467 case USB_SPEED_LOW:
468 return 10;
469 case USB_SPEED_FULL:
470 default:
471 return 1;
472 }
473}
474
475static inline int usb_int_enabled(struct zd_usb *usb)
476{
477 unsigned long flags;
478 struct zd_usb_interrupt *intr = &usb->intr;
479 struct urb *urb;
480
481 spin_lock_irqsave(&intr->lock, flags);
482 urb = intr->urb;
483 spin_unlock_irqrestore(&intr->lock, flags);
484 return urb != NULL;
485}
486
487int zd_usb_enable_int(struct zd_usb *usb)
488{
489 int r;
490 struct usb_device *udev;
491 struct zd_usb_interrupt *intr = &usb->intr;
492 void *transfer_buffer = NULL;
493 struct urb *urb;
494
495 dev_dbg_f(zd_usb_dev(usb), "\n");
496
497 urb = usb_alloc_urb(0, GFP_NOFS);
498 if (!urb) {
499 r = -ENOMEM;
500 goto out;
501 }
502
503 ZD_ASSERT(!irqs_disabled());
504 spin_lock_irq(&intr->lock);
505 if (intr->urb) {
506 spin_unlock_irq(&intr->lock);
507 r = 0;
508 goto error_free_urb;
509 }
510 intr->urb = urb;
511 spin_unlock_irq(&intr->lock);
512
513 /* TODO: make it a DMA buffer */
514 r = -ENOMEM;
515 transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_NOFS);
516 if (!transfer_buffer) {
517 dev_dbg_f(zd_usb_dev(usb),
518 "couldn't allocate transfer_buffer\n");
519 goto error_set_urb_null;
520 }
521
522 udev = zd_usb_to_usbdev(usb);
523 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
524 transfer_buffer, USB_MAX_EP_INT_BUFFER,
525 int_urb_complete, usb,
526 intr->interval);
527
528 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
529 r = usb_submit_urb(urb, GFP_NOFS);
530 if (r) {
531 dev_dbg_f(zd_usb_dev(usb),
532 "Couldn't submit urb. Error number %d\n", r);
533 goto error;
534 }
535
536 return 0;
537error:
538 kfree(transfer_buffer);
539error_set_urb_null:
540 spin_lock_irq(&intr->lock);
541 intr->urb = NULL;
542 spin_unlock_irq(&intr->lock);
543error_free_urb:
544 usb_free_urb(urb);
545out:
546 return r;
547}
548
549void zd_usb_disable_int(struct zd_usb *usb)
550{
551 unsigned long flags;
552 struct zd_usb_interrupt *intr = &usb->intr;
553 struct urb *urb;
554
555 spin_lock_irqsave(&intr->lock, flags);
556 urb = intr->urb;
557 if (!urb) {
558 spin_unlock_irqrestore(&intr->lock, flags);
559 return;
560 }
561 intr->urb = NULL;
562 spin_unlock_irqrestore(&intr->lock, flags);
563
564 usb_kill_urb(urb);
565 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
566 usb_free_urb(urb);
567}
568
569static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
570 unsigned int length)
571{
572 int i;
573 struct zd_mac *mac = zd_usb_to_mac(usb);
574 const struct rx_length_info *length_info;
575
576 if (length < sizeof(struct rx_length_info)) {
577 /* It's not a complete packet anyhow. */
578 return;
579 }
580 length_info = (struct rx_length_info *)
581 (buffer + length - sizeof(struct rx_length_info));
582
583 /* It might be that three frames are merged into a single URB
584 * transaction. We have to check for the length info tag.
585 *
586 * While testing we discovered that length_info might be unaligned,
587 * because if USB transactions are merged, the last packet will not
588 * be padded. Unaligned access might also happen if the length_info
589 * structure is not present.
590 */
b269825b
UK		 591 if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
592 {
e85d0918
DD		 593 unsigned int l, k, n;
594 for (i = 0, l = 0;; i++) {
b269825b 595 k = le16_to_cpu(get_unaligned(&length_info->length[i]));
850c211c
UK		 596 if (k == 0)
597 return;
e85d0918
DD		 598 n = l+k;
599 if (n > length)
600 return;
4d1feabc 601 zd_mac_rx_irq(mac, buffer+l, k);
e85d0918
DD		 602 if (i >= 2)
603 return;
604 l = (n+3) & ~3;
605 }
606 } else {
4d1feabc 607 zd_mac_rx_irq(mac, buffer, length);
e85d0918
DD		 608 }
609}
610
7d12e780 611static void rx_urb_complete(struct urb *urb)
e85d0918
DD		 612{
613 struct zd_usb *usb;
614 struct zd_usb_rx *rx;
615 const u8 *buffer;
616 unsigned int length;
617
618 switch (urb->status) {
619 case 0:
620 break;
621 case -ESHUTDOWN:
622 case -EINVAL:
623 case -ENODEV:
624 case -ENOENT:
625 case -ECONNRESET:
e85d0918 626 case -EPIPE:
b312d799 627 return;
e85d0918
DD		 628 default:
629 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
630 goto resubmit;
631 }
632
633 buffer = urb->transfer_buffer;
634 length = urb->actual_length;
635 usb = urb->context;
636 rx = &usb->rx;
637
638 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
639 /* If there is an old first fragment, we don't care. */
640 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
641 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
642 spin_lock(&rx->lock);
643 memcpy(rx->fragment, buffer, length);
644 rx->fragment_length = length;
645 spin_unlock(&rx->lock);
646 goto resubmit;
647 }
648
649 spin_lock(&rx->lock);
650 if (rx->fragment_length > 0) {
651 /* We are on a second fragment, we believe */
652 ZD_ASSERT(length + rx->fragment_length <=
653 ARRAY_SIZE(rx->fragment));
654 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
655 memcpy(rx->fragment+rx->fragment_length, buffer, length);
656 handle_rx_packet(usb, rx->fragment,
657 rx->fragment_length + length);
658 rx->fragment_length = 0;
659 spin_unlock(&rx->lock);
660 } else {
661 spin_unlock(&rx->lock);
662 handle_rx_packet(usb, buffer, length);
663 }
664
665resubmit:
666 usb_submit_urb(urb, GFP_ATOMIC);
667}
668
c48cf125 669static struct urb *alloc_urb(struct zd_usb *usb)
e85d0918
DD		 670{
671 struct usb_device *udev = zd_usb_to_usbdev(usb);
672 struct urb *urb;
673 void *buffer;
674
675 urb = usb_alloc_urb(0, GFP_NOFS);
676 if (!urb)
677 return NULL;
678 buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS,
679 &urb->transfer_dma);
680 if (!buffer) {
681 usb_free_urb(urb);
682 return NULL;
683 }
684
685 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
686 buffer, USB_MAX_RX_SIZE,
687 rx_urb_complete, usb);
688 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
689
690 return urb;
691}
692
c48cf125 693static void free_urb(struct urb *urb)
e85d0918
DD		 694{
695 if (!urb)
696 return;
697 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
698 urb->transfer_buffer, urb->transfer_dma);
699 usb_free_urb(urb);
700}
701
702int zd_usb_enable_rx(struct zd_usb *usb)
703{
704 int i, r;
705 struct zd_usb_rx *rx = &usb->rx;
706 struct urb **urbs;
707
708 dev_dbg_f(zd_usb_dev(usb), "\n");
709
710 r = -ENOMEM;
711 urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS);
712 if (!urbs)
713 goto error;
714 for (i = 0; i < URBS_COUNT; i++) {
715 urbs[i] = alloc_urb(usb);
716 if (!urbs[i])
717 goto error;
718 }
719
720 ZD_ASSERT(!irqs_disabled());
721 spin_lock_irq(&rx->lock);
722 if (rx->urbs) {
723 spin_unlock_irq(&rx->lock);
724 r = 0;
725 goto error;
726 }
727 rx->urbs = urbs;
728 rx->urbs_count = URBS_COUNT;
729 spin_unlock_irq(&rx->lock);
730
731 for (i = 0; i < URBS_COUNT; i++) {
732 r = usb_submit_urb(urbs[i], GFP_NOFS);
733 if (r)
734 goto error_submit;
735 }
736
737 return 0;
738error_submit:
739 for (i = 0; i < URBS_COUNT; i++) {
740 usb_kill_urb(urbs[i]);
741 }
742 spin_lock_irq(&rx->lock);
743 rx->urbs = NULL;
744 rx->urbs_count = 0;
745 spin_unlock_irq(&rx->lock);
746error:
747 if (urbs) {
748 for (i = 0; i < URBS_COUNT; i++)
749 free_urb(urbs[i]);
750 }
751 return r;
752}
753
754void zd_usb_disable_rx(struct zd_usb *usb)
755{
756 int i;
757 unsigned long flags;
758 struct urb **urbs;
759 unsigned int count;
760 struct zd_usb_rx *rx = &usb->rx;
761
762 spin_lock_irqsave(&rx->lock, flags);
763 urbs = rx->urbs;
764 count = rx->urbs_count;
765 spin_unlock_irqrestore(&rx->lock, flags);
766 if (!urbs)
767 return;
768
769 for (i = 0; i < count; i++) {
770 usb_kill_urb(urbs[i]);
771 free_urb(urbs[i]);
772 }
773 kfree(urbs);
774
775 spin_lock_irqsave(&rx->lock, flags);
776 rx->urbs = NULL;
777 rx->urbs_count = 0;
778 spin_unlock_irqrestore(&rx->lock, flags);
779}
780
7d12e780 781static void tx_urb_complete(struct urb *urb)
e85d0918
DD		 782{
783 int r;
784
785 switch (urb->status) {
786 case 0:
787 break;
788 case -ESHUTDOWN:
789 case -EINVAL:
790 case -ENODEV:
791 case -ENOENT:
792 case -ECONNRESET:
b312d799 793 case -EPIPE:
e85d0918
DD		 794 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
795 break;
e85d0918
DD		 796 default:
797 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
798 goto resubmit;
799 }
800free_urb:
801 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
802 urb->transfer_buffer, urb->transfer_dma);
803 usb_free_urb(urb);
804 return;
805resubmit:
806 r = usb_submit_urb(urb, GFP_ATOMIC);
807 if (r) {
808 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
809 goto free_urb;
810 }
811}
812
813/* Puts the frame on the USB endpoint. It doesn't wait for
814 * completion. The frame must contain the control set.
815 */
816int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
817{
818 int r;
819 struct usb_device *udev = zd_usb_to_usbdev(usb);
820 struct urb *urb;
821 void *buffer;
822
823 urb = usb_alloc_urb(0, GFP_ATOMIC);
824 if (!urb) {
825 r = -ENOMEM;
826 goto out;
827 }
828
829 buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
830 &urb->transfer_dma);
831 if (!buffer) {
832 r = -ENOMEM;
833 goto error_free_urb;
834 }
835 memcpy(buffer, frame, length);
836
837 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
838 buffer, length, tx_urb_complete, NULL);
839 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
840
841 r = usb_submit_urb(urb, GFP_ATOMIC);
842 if (r)
843 goto error;
844 return 0;
845error:
846 usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
847 urb->transfer_dma);
848error_free_urb:
849 usb_free_urb(urb);
850out:
851 return r;
852}
853
854static inline void init_usb_interrupt(struct zd_usb *usb)
855{
856 struct zd_usb_interrupt *intr = &usb->intr;
857
858 spin_lock_init(&intr->lock);
859 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
860 init_completion(&intr->read_regs.completion);
861 intr->read_regs.cr_int_addr = cpu_to_le16(usb_addr(usb, CR_INTERRUPT));
862}
863
864static inline void init_usb_rx(struct zd_usb *usb)
865{
866 struct zd_usb_rx *rx = &usb->rx;
867 spin_lock_init(&rx->lock);
868 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
869 rx->usb_packet_size = 512;
870 } else {
871 rx->usb_packet_size = 64;
872 }
873 ZD_ASSERT(rx->fragment_length == 0);
874}
875
876static inline void init_usb_tx(struct zd_usb *usb)
877{
878 /* FIXME: at this point we will allocate a fixed number of urb's for
879 * use in a cyclic scheme */
880}
881
882void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
883 struct usb_interface *intf)
884{
885 memset(usb, 0, sizeof(*usb));
886 usb->intf = usb_get_intf(intf);
887 usb_set_intfdata(usb->intf, netdev);
888 init_usb_interrupt(usb);
889 init_usb_tx(usb);
890 init_usb_rx(usb);
891}
892
893int zd_usb_init_hw(struct zd_usb *usb)
894{
895 int r;
896 struct zd_chip *chip = zd_usb_to_chip(usb);
897
898 ZD_ASSERT(mutex_is_locked(&chip->mutex));
899 r = zd_ioread16_locked(chip, &usb->fw_base_offset,
900 USB_REG((u16)FW_BASE_ADDR_OFFSET));
901 if (r)
902 return r;
903 dev_dbg_f(zd_usb_dev(usb), "fw_base_offset: %#06hx\n",
904 usb->fw_base_offset);
905
906 return 0;
907}
908
909void zd_usb_clear(struct zd_usb *usb)
910{
911 usb_set_intfdata(usb->intf, NULL);
912 usb_put_intf(usb->intf);
c48cf125 913 ZD_MEMCLEAR(usb, sizeof(*usb));
e85d0918
DD		 914 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
915}
916
917static const char *speed(enum usb_device_speed speed)
918{
919 switch (speed) {
920 case USB_SPEED_LOW:
921 return "low";
922 case USB_SPEED_FULL:
923 return "full";
924 case USB_SPEED_HIGH:
925 return "high";
926 default:
927 return "unknown speed";
928 }
929}
930
931static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
932{
933 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
934 le16_to_cpu(udev->descriptor.idVendor),
935 le16_to_cpu(udev->descriptor.idProduct),
936 get_bcdDevice(udev),
937 speed(udev->speed));
938}
939
940int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
941{
942 struct usb_device *udev = interface_to_usbdev(usb->intf);
943 return scnprint_id(udev, buffer, size);
944}
945
946#ifdef DEBUG
947static void print_id(struct usb_device *udev)
948{
949 char buffer[40];
950
951 scnprint_id(udev, buffer, sizeof(buffer));
952 buffer[sizeof(buffer)-1] = 0;
953 dev_dbg_f(&udev->dev, "%s\n", buffer);
954}
955#else
956#define print_id(udev) do { } while (0)
957#endif
958
a1030e92
DD		 959static int eject_installer(struct usb_interface *intf)
960{
961 struct usb_device *udev = interface_to_usbdev(intf);
962 struct usb_host_interface *iface_desc = &intf->altsetting[0];
963 struct usb_endpoint_descriptor *endpoint;
964 unsigned char *cmd;
965 u8 bulk_out_ep;
966 int r;
967
968 /* Find bulk out endpoint */
969 endpoint = &iface_desc->endpoint[1].desc;
970 if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
971 (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
972 USB_ENDPOINT_XFER_BULK) {
973 bulk_out_ep = endpoint->bEndpointAddress;
974 } else {
975 dev_err(&udev->dev,
976 "zd1211rw: Could not find bulk out endpoint\n");
977 return -ENODEV;
978 }
979
980 cmd = kzalloc(31, GFP_KERNEL);
981 if (cmd == NULL)
982 return -ENODEV;
983
984 /* USB bulk command block */
985 cmd[0] = 0x55; /* bulk command signature */
986 cmd[1] = 0x53; /* bulk command signature */
987 cmd[2] = 0x42; /* bulk command signature */
988 cmd[3] = 0x43; /* bulk command signature */
989 cmd[14] = 6; /* command length */
990
991 cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
992 cmd[19] = 0x2; /* eject disc */
993
994 dev_info(&udev->dev, "Ejecting virtual installer media...\n");
995 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
996 cmd, 31, NULL, 2000);
997 kfree(cmd);
998 if (r)
999 return r;
1000
1001 /* At this point, the device disconnects and reconnects with the real
1002 * ID numbers. */
1003
1004 usb_set_intfdata(intf, NULL);
1005 return 0;
1006}
1007
e85d0918
DD		 1008static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1009{
1010 int r;
1011 struct usb_device *udev = interface_to_usbdev(intf);
1012 struct net_device *netdev = NULL;
1013
1014 print_id(udev);
1015
a1030e92
DD		 1016 if (id->driver_info & DEVICE_INSTALLER)
1017 return eject_installer(intf);
1018
e85d0918
DD		 1019 switch (udev->speed) {
1020 case USB_SPEED_LOW:
1021 case USB_SPEED_FULL:
1022 case USB_SPEED_HIGH:
1023 break;
1024 default:
1025 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1026 r = -ENODEV;
1027 goto error;
1028 }
1029
1030 netdev = zd_netdev_alloc(intf);
1031 if (netdev == NULL) {
1032 r = -ENOMEM;
1033 goto error;
1034 }
1035
1036 r = upload_firmware(udev, id->driver_info);
1037 if (r) {
1038 dev_err(&intf->dev,
1039 "couldn't load firmware. Error number %d\n", r);
1040 goto error;
1041 }
1042
1043 r = usb_reset_configuration(udev);
1044 if (r) {
1045 dev_dbg_f(&intf->dev,
1046 "couldn't reset configuration. Error number %d\n", r);
1047 goto error;
1048 }
1049
1050 /* At this point the interrupt endpoint is not generally enabled. We
1051 * save the USB bandwidth until the network device is opened. But
1052 * notify that the initialization of the MAC will require the
1053 * interrupts to be temporary enabled.
1054 */
1055 r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
1056 if (r) {
1057 dev_dbg_f(&intf->dev,
1058 "couldn't initialize mac. Error number %d\n", r);
1059 goto error;
1060 }
1061
1062 r = register_netdev(netdev);
1063 if (r) {
1064 dev_dbg_f(&intf->dev,
1065 "couldn't register netdev. Error number %d\n", r);
1066 goto error;
1067 }
1068
1069 dev_dbg_f(&intf->dev, "successful\n");
1070 dev_info(&intf->dev,"%s\n", netdev->name);
1071 return 0;
1072error:
1073 usb_reset_device(interface_to_usbdev(intf));
1074 zd_netdev_free(netdev);
1075 return r;
1076}
1077
1078static void disconnect(struct usb_interface *intf)
1079{
1080 struct net_device *netdev = zd_intf_to_netdev(intf);
1081 struct zd_mac *mac = zd_netdev_mac(netdev);
1082 struct zd_usb *usb = &mac->chip.usb;
1083
a1030e92
DD		 1084 /* Either something really bad happened, or we're just dealing with
1085 * a DEVICE_INSTALLER. */
1086 if (netdev == NULL)
1087 return;
1088
e85d0918
DD		 1089 dev_dbg_f(zd_usb_dev(usb), "\n");
1090
1091 zd_netdev_disconnect(netdev);
1092
1093 /* Just in case something has gone wrong! */
1094 zd_usb_disable_rx(usb);
1095 zd_usb_disable_int(usb);
1096
1097 /* If the disconnect has been caused by a removal of the
1098 * driver module, the reset allows reloading of the driver. If the
1099 * reset will not be executed here, the upload of the firmware in the
1100 * probe function caused by the reloading of the driver will fail.
1101 */
1102 usb_reset_device(interface_to_usbdev(intf));
1103
e85d0918
DD		 1104 zd_netdev_free(netdev);
1105 dev_dbg(&intf->dev, "disconnected\n");
1106}
1107
1108static struct usb_driver driver = {
1109 .name = "zd1211rw",
1110 .id_table = usb_ids,
1111 .probe = probe,
1112 .disconnect = disconnect,
1113};
1114
bc5f06a8
UK		 1115struct workqueue_struct *zd_workqueue;
1116
e85d0918
DD		 1117static int __init usb_init(void)
1118{
1119 int r;
1120
741fec53 1121 pr_debug("%s usb_init()\n", driver.name);
e85d0918 1122
bc5f06a8
UK		 1123 zd_workqueue = create_singlethread_workqueue(driver.name);
1124 if (zd_workqueue == NULL) {
741fec53 1125 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
bc5f06a8
UK		 1126 return -ENOMEM;
1127 }
1128
e85d0918
DD		 1129 r = usb_register(&driver);
1130 if (r) {
192b775c 1131 destroy_workqueue(zd_workqueue);
741fec53
UK		 1132 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1133 driver.name, r);
e85d0918
DD		 1134 return r;
1135 }
1136
741fec53 1137 pr_debug("%s initialized\n", driver.name);
e85d0918
DD		 1138 return 0;
1139}
1140
1141static void __exit usb_exit(void)
1142{
741fec53 1143 pr_debug("%s usb_exit()\n", driver.name);
e85d0918 1144 usb_deregister(&driver);
bc5f06a8 1145 destroy_workqueue(zd_workqueue);
e85d0918
DD		 1146}
1147
1148module_init(usb_init);
1149module_exit(usb_exit);
1150
1151static int usb_int_regs_length(unsigned int count)
1152{
1153 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1154}
1155
1156static void prepare_read_regs_int(struct zd_usb *usb)
1157{
1158 struct zd_usb_interrupt *intr = &usb->intr;
1159
a68077de 1160 spin_lock_irq(&intr->lock);
e85d0918
DD		 1161 intr->read_regs_enabled = 1;
1162 INIT_COMPLETION(intr->read_regs.completion);
a68077de
UK		 1163 spin_unlock_irq(&intr->lock);
1164}
1165
1166static void disable_read_regs_int(struct zd_usb *usb)
1167{
1168 struct zd_usb_interrupt *intr = &usb->intr;
1169
1170 spin_lock_irq(&intr->lock);
1171 intr->read_regs_enabled = 0;
1172 spin_unlock_irq(&intr->lock);
e85d0918
DD		 1173}
1174
1175static int get_results(struct zd_usb *usb, u16 *values,
1176 struct usb_req_read_regs *req, unsigned int count)
1177{
1178 int r;
1179 int i;
1180 struct zd_usb_interrupt *intr = &usb->intr;
1181 struct read_regs_int *rr = &intr->read_regs;
1182 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1183
a68077de 1184 spin_lock_irq(&intr->lock);
e85d0918
DD		 1185
1186 r = -EIO;
1187 /* The created block size seems to be larger than expected.
1188 * However results appear to be correct.
1189 */
1190 if (rr->length < usb_int_regs_length(count)) {
1191 dev_dbg_f(zd_usb_dev(usb),
1192 "error: actual length %d less than expected %d\n",
1193 rr->length, usb_int_regs_length(count));
1194 goto error_unlock;
1195 }
1196 if (rr->length > sizeof(rr->buffer)) {
1197 dev_dbg_f(zd_usb_dev(usb),
1198 "error: actual length %d exceeds buffer size %zu\n",
1199 rr->length, sizeof(rr->buffer));
1200 goto error_unlock;
1201 }
1202
1203 for (i = 0; i < count; i++) {
1204 struct reg_data *rd = &regs->regs[i];
1205 if (rd->addr != req->addr[i]) {
1206 dev_dbg_f(zd_usb_dev(usb),
1207 "rd[%d] addr %#06hx expected %#06hx\n", i,
1208 le16_to_cpu(rd->addr),
1209 le16_to_cpu(req->addr[i]));
1210 goto error_unlock;
1211 }
1212 values[i] = le16_to_cpu(rd->value);
1213 }
1214
1215 r = 0;
1216error_unlock:
a68077de 1217 spin_unlock_irq(&intr->lock);
e85d0918
DD		 1218 return r;
1219}
1220
1221int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1222 const zd_addr_t *addresses, unsigned int count)
1223{
1224 int r;
1225 int i, req_len, actual_req_len;
1226 struct usb_device *udev;
1227 struct usb_req_read_regs *req = NULL;
1228 unsigned long timeout;
1229
1230 if (count < 1) {
1231 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1232 return -EINVAL;
1233 }
1234 if (count > USB_MAX_IOREAD16_COUNT) {
1235 dev_dbg_f(zd_usb_dev(usb),
1236 "error: count %u exceeds possible max %u\n",
1237 count, USB_MAX_IOREAD16_COUNT);
1238 return -EINVAL;
1239 }
1240 if (in_atomic()) {
1241 dev_dbg_f(zd_usb_dev(usb),
1242 "error: io in atomic context not supported\n");
1243 return -EWOULDBLOCK;
1244 }
1245 if (!usb_int_enabled(usb)) {
1246 dev_dbg_f(zd_usb_dev(usb),
1247 "error: usb interrupt not enabled\n");
1248 return -EWOULDBLOCK;
1249 }
1250
1251 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1252 req = kmalloc(req_len, GFP_NOFS);
1253 if (!req)
1254 return -ENOMEM;
1255 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1256 for (i = 0; i < count; i++)
1257 req->addr[i] = cpu_to_le16(usb_addr(usb, addresses[i]));
1258
1259 udev = zd_usb_to_usbdev(usb);
1260 prepare_read_regs_int(usb);
1261 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1262 req, req_len, &actual_req_len, 1000 /* ms */);
1263 if (r) {
1264 dev_dbg_f(zd_usb_dev(usb),
1265 "error in usb_bulk_msg(). Error number %d\n", r);
1266 goto error;
1267 }
1268 if (req_len != actual_req_len) {
1269 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1270 " req_len %d != actual_req_len %d\n",
1271 req_len, actual_req_len);
1272 r = -EIO;
1273 goto error;
1274 }
1275
1276 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1277 msecs_to_jiffies(1000));
1278 if (!timeout) {
1279 disable_read_regs_int(usb);
1280 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1281 r = -ETIMEDOUT;
1282 goto error;
1283 }
1284
1285 r = get_results(usb, values, req, count);
1286error:
1287 kfree(req);
1288 return r;
1289}
1290
1291int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1292 unsigned int count)
1293{
1294 int r;
1295 struct usb_device *udev;
1296 struct usb_req_write_regs *req = NULL;
1297 int i, req_len, actual_req_len;
1298
1299 if (count == 0)
1300 return 0;
1301 if (count > USB_MAX_IOWRITE16_COUNT) {
1302 dev_dbg_f(zd_usb_dev(usb),
1303 "error: count %u exceeds possible max %u\n",
1304 count, USB_MAX_IOWRITE16_COUNT);
1305 return -EINVAL;
1306 }
1307 if (in_atomic()) {
1308 dev_dbg_f(zd_usb_dev(usb),
1309 "error: io in atomic context not supported\n");
1310 return -EWOULDBLOCK;
1311 }
1312
1313 req_len = sizeof(struct usb_req_write_regs) +
1314 count * sizeof(struct reg_data);
1315 req = kmalloc(req_len, GFP_NOFS);
1316 if (!req)
1317 return -ENOMEM;
1318
1319 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1320 for (i = 0; i < count; i++) {
1321 struct reg_data *rw = &req->reg_writes[i];
1322 rw->addr = cpu_to_le16(usb_addr(usb, ioreqs[i].addr));
1323 rw->value = cpu_to_le16(ioreqs[i].value);
1324 }
1325
1326 udev = zd_usb_to_usbdev(usb);
1327 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1328 req, req_len, &actual_req_len, 1000 /* ms */);
1329 if (r) {
1330 dev_dbg_f(zd_usb_dev(usb),
1331 "error in usb_bulk_msg(). Error number %d\n", r);
1332 goto error;
1333 }
1334 if (req_len != actual_req_len) {
1335 dev_dbg_f(zd_usb_dev(usb),
1336 "error in usb_bulk_msg()"
1337 " req_len %d != actual_req_len %d\n",
1338 req_len, actual_req_len);
1339 r = -EIO;
1340 goto error;
1341 }
1342
1343 /* FALL-THROUGH with r == 0 */
1344error:
1345 kfree(req);
1346 return r;
1347}
1348
1349int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1350{
1351 int r;
1352 struct usb_device *udev;
1353 struct usb_req_rfwrite *req = NULL;
1354 int i, req_len, actual_req_len;
1355 u16 bit_value_template;
1356
1357 if (in_atomic()) {
1358 dev_dbg_f(zd_usb_dev(usb),
1359 "error: io in atomic context not supported\n");
1360 return -EWOULDBLOCK;
1361 }
1362 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1363 dev_dbg_f(zd_usb_dev(usb),
1364 "error: bits %d are smaller than"
1365 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1366 bits, USB_MIN_RFWRITE_BIT_COUNT);
1367 return -EINVAL;
1368 }
1369 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1370 dev_dbg_f(zd_usb_dev(usb),
1371 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1372 bits, USB_MAX_RFWRITE_BIT_COUNT);
1373 return -EINVAL;
1374 }
1375#ifdef DEBUG
1376 if (value & (~0UL << bits)) {
1377 dev_dbg_f(zd_usb_dev(usb),
1378 "error: value %#09x has bits >= %d set\n",
1379 value, bits);
1380 return -EINVAL;
1381 }
1382#endif /* DEBUG */
1383
1384 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1385
1386 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1387 if (r) {
1388 dev_dbg_f(zd_usb_dev(usb),
1389 "error %d: Couldn't read CR203\n", r);
1390 goto out;
1391 }
1392 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1393
1394 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1395 req = kmalloc(req_len, GFP_NOFS);
1396 if (!req)
1397 return -ENOMEM;
1398
1399 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1400 /* 1: 3683a, but not used in ZYDAS driver */
1401 req->value = cpu_to_le16(2);
1402 req->bits = cpu_to_le16(bits);
1403
1404 for (i = 0; i < bits; i++) {
1405 u16 bv = bit_value_template;
1406 if (value & (1 << (bits-1-i)))
1407 bv |= RF_DATA;
1408 req->bit_values[i] = cpu_to_le16(bv);
1409 }
1410
1411 udev = zd_usb_to_usbdev(usb);
1412 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1413 req, req_len, &actual_req_len, 1000 /* ms */);
1414 if (r) {
1415 dev_dbg_f(zd_usb_dev(usb),
1416 "error in usb_bulk_msg(). Error number %d\n", r);
1417 goto out;
1418 }
1419 if (req_len != actual_req_len) {
1420 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1421 " req_len %d != actual_req_len %d\n",
1422 req_len, actual_req_len);
1423 r = -EIO;
1424 goto out;
1425 }
1426
1427 /* FALL-THROUGH with r == 0 */
1428out:
1429 kfree(req);
1430 return r;
1431}
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