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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / net / wireless / zd1211rw / zd_usb.c
blob7942b15acfe7019bc604ccc442b066b56107c36b
1 /* ZD1211 USB-WLAN driver for Linux
2 *
3 * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
4 * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
5 * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 #include <linux/kernel.h>
23 #include <linux/init.h>
24 #include <linux/firmware.h>
25 #include <linux/device.h>
26 #include <linux/errno.h>
27 #include <linux/skbuff.h>
28 #include <linux/usb.h>
29 #include <linux/workqueue.h>
30 #include <net/mac80211.h>
31 #include <asm/unaligned.h>
32
33 #include "zd_def.h"
34 #include "zd_mac.h"
35 #include "zd_usb.h"
36
37 static struct usb_device_id usb_ids[] = {
38 /* ZD1211 */
39 { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
40 { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
41 { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
42 { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
43 { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
44 { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
45 { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
46 { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
47 { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
48 { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
49 { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
50 { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
51 { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
52 { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
53 { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
54 { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
55 { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
56 { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
57 { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
58 { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
59 { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 },
60 { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
61 /* ZD1211B */
62 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
63 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
64 { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
65 { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
66 { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
67 { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
68 { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
69 { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
70 { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
71 { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
72 { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
73 { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
74 { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
75 { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
76 { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
77 { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
78 { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
79 { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
80 { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
81 { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
82 { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
83 /* "Driverless" devices that need ejecting */
84 { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
85 { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
86 {}
87 };
88
89 MODULE_LICENSE("GPL");
90 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
91 MODULE_AUTHOR("Ulrich Kunitz");
92 MODULE_AUTHOR("Daniel Drake");
93 MODULE_VERSION("1.0");
94 MODULE_DEVICE_TABLE(usb, usb_ids);
95
96 #define FW_ZD1211_PREFIX "zd1211/zd1211_"
97 #define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
98
99 /* USB device initialization */
100
101 static int request_fw_file(
102 const struct firmware **fw, const char *name, struct device *device)
103 {
104 int r;
105
106 dev_dbg_f(device, "fw name %s\n", name);
107
108 r = request_firmware(fw, name, device);
109 if (r)
110 dev_err(device,
111 "Could not load firmware file %s. Error number %d\n",
112 name, r);
113 return r;
114 }
115
116 static inline u16 get_bcdDevice(const struct usb_device *udev)
117 {
118 return le16_to_cpu(udev->descriptor.bcdDevice);
119 }
120
121 enum upload_code_flags {
122 REBOOT = 1,
123 };
124
125 /* Ensures that MAX_TRANSFER_SIZE is even. */
126 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
127
128 static int upload_code(struct usb_device *udev,
129 const u8 *data, size_t size, u16 code_offset, int flags)
130 {
131 u8 *p;
132 int r;
133
134 /* USB request blocks need "kmalloced" buffers.
135 */
136 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
137 if (!p) {
138 dev_err(&udev->dev, "out of memory\n");
139 r = -ENOMEM;
140 goto error;
141 }
142
143 size &= ~1;
144 while (size > 0) {
145 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
146 size : MAX_TRANSFER_SIZE;
147
148 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
149
150 memcpy(p, data, transfer_size);
151 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
152 USB_REQ_FIRMWARE_DOWNLOAD,
153 USB_DIR_OUT | USB_TYPE_VENDOR,
154 code_offset, 0, p, transfer_size, 1000 /* ms */);
155 if (r < 0) {
156 dev_err(&udev->dev,
157 "USB control request for firmware upload"
158 " failed. Error number %d\n", r);
159 goto error;
160 }
161 transfer_size = r & ~1;
162
163 size -= transfer_size;
164 data += transfer_size;
165 code_offset += transfer_size/sizeof(u16);
166 }
167
168 if (flags & REBOOT) {
169 u8 ret;
170
171 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
172 USB_REQ_FIRMWARE_CONFIRM,
173 USB_DIR_IN | USB_TYPE_VENDOR,
174 0, 0, &ret, sizeof(ret), 5000 /* ms */);
175 if (r != sizeof(ret)) {
176 dev_err(&udev->dev,
177 "control request firmeware confirmation failed."
178 " Return value %d\n", r);
179 if (r >= 0)
180 r = -ENODEV;
181 goto error;
182 }
183 if (ret & 0x80) {
184 dev_err(&udev->dev,
185 "Internal error while downloading."
186 " Firmware confirm return value %#04x\n",
187 (unsigned int)ret);
188 r = -ENODEV;
189 goto error;
190 }
191 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
192 (unsigned int)ret);
193 }
194
195 r = 0;
196 error:
197 kfree(p);
198 return r;
199 }
200
201 static u16 get_word(const void *data, u16 offset)
202 {
203 const __le16 *p = data;
204 return le16_to_cpu(p[offset]);
205 }
206
207 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
208 const char* postfix)
209 {
210 scnprintf(buffer, size, "%s%s",
211 usb->is_zd1211b ?
212 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
213 postfix);
214 return buffer;
215 }
216
217 static int handle_version_mismatch(struct zd_usb *usb,
218 const struct firmware *ub_fw)
219 {
220 struct usb_device *udev = zd_usb_to_usbdev(usb);
221 const struct firmware *ur_fw = NULL;
222 int offset;
223 int r = 0;
224 char fw_name[128];
225
226 r = request_fw_file(&ur_fw,
227 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
228 &udev->dev);
229 if (r)
230 goto error;
231
232 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
233 if (r)
234 goto error;
235
236 offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
237 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
238 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
239
240 /* At this point, the vendor driver downloads the whole firmware
241 * image, hacks around with version IDs, and uploads it again,
242 * completely overwriting the boot code. We do not do this here as
243 * it is not required on any tested devices, and it is suspected to
244 * cause problems. */
245 error:
246 release_firmware(ur_fw);
247 return r;
248 }
249
250 static int upload_firmware(struct zd_usb *usb)
251 {
252 int r;
253 u16 fw_bcdDevice;
254 u16 bcdDevice;
255 struct usb_device *udev = zd_usb_to_usbdev(usb);
256 const struct firmware *ub_fw = NULL;
257 const struct firmware *uph_fw = NULL;
258 char fw_name[128];
259
260 bcdDevice = get_bcdDevice(udev);
261
262 r = request_fw_file(&ub_fw,
263 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
264 &udev->dev);
265 if (r)
266 goto error;
267
268 fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
269
270 if (fw_bcdDevice != bcdDevice) {
271 dev_info(&udev->dev,
272 "firmware version %#06x and device bootcode version "
273 "%#06x differ\n", fw_bcdDevice, bcdDevice);
274 if (bcdDevice <= 0x4313)
275 dev_warn(&udev->dev, "device has old bootcode, please "
276 "report success or failure\n");
277
278 r = handle_version_mismatch(usb, ub_fw);
279 if (r)
280 goto error;
281 } else {
282 dev_dbg_f(&udev->dev,
283 "firmware device id %#06x is equal to the "
284 "actual device id\n", fw_bcdDevice);
285 }
286
287
288 r = request_fw_file(&uph_fw,
289 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
290 &udev->dev);
291 if (r)
292 goto error;
293
294 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
295 if (r) {
296 dev_err(&udev->dev,
297 "Could not upload firmware code uph. Error number %d\n",
298 r);
299 }
300
301 /* FALL-THROUGH */
302 error:
303 release_firmware(ub_fw);
304 release_firmware(uph_fw);
305 return r;
306 }
307
308 /* Read data from device address space using "firmware interface" which does
309 * not require firmware to be loaded. */
310 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
311 {
312 int r;
313 struct usb_device *udev = zd_usb_to_usbdev(usb);
314
315 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
316 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
317 data, len, 5000);
318 if (r < 0) {
319 dev_err(&udev->dev,
320 "read over firmware interface failed: %d\n", r);
321 return r;
322 } else if (r != len) {
323 dev_err(&udev->dev,
324 "incomplete read over firmware interface: %d/%d\n",
325 r, len);
326 return -EIO;
327 }
328
329 return 0;
330 }
331
332 #define urb_dev(urb) (&(urb)->dev->dev)
333
334 static inline void handle_regs_int(struct urb *urb)
335 {
336 struct zd_usb *usb = urb->context;
337 struct zd_usb_interrupt *intr = &usb->intr;
338 int len;
339
340 ZD_ASSERT(in_interrupt());
341 spin_lock(&intr->lock);
342
343 if (intr->read_regs_enabled) {
344 intr->read_regs.length = len = urb->actual_length;
345
346 if (len > sizeof(intr->read_regs.buffer))
347 len = sizeof(intr->read_regs.buffer);
348 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
349 intr->read_regs_enabled = 0;
350 complete(&intr->read_regs.completion);
351 goto out;
352 }
353
354 dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
355 out:
356 spin_unlock(&intr->lock);
357 }
358
359 static void int_urb_complete(struct urb *urb)
360 {
361 int r;
362 struct usb_int_header *hdr;
363
364 switch (urb->status) {
365 case 0:
366 break;
367 case -ESHUTDOWN:
368 case -EINVAL:
369 case -ENODEV:
370 case -ENOENT:
371 case -ECONNRESET:
372 case -EPIPE:
373 goto kfree;
374 default:
375 goto resubmit;
376 }
377
378 if (urb->actual_length < sizeof(hdr)) {
379 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
380 goto resubmit;
381 }
382
383 hdr = urb->transfer_buffer;
384 if (hdr->type != USB_INT_TYPE) {
385 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
386 goto resubmit;
387 }
388
389 switch (hdr->id) {
390 case USB_INT_ID_REGS:
391 handle_regs_int(urb);
392 break;
393 case USB_INT_ID_RETRY_FAILED:
394 zd_mac_tx_failed(zd_usb_to_hw(urb->context));
395 break;
396 default:
397 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
398 (unsigned int)hdr->id);
399 goto resubmit;
400 }
401
402 resubmit:
403 r = usb_submit_urb(urb, GFP_ATOMIC);
404 if (r) {
405 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
406 goto kfree;
407 }
408 return;
409 kfree:
410 kfree(urb->transfer_buffer);
411 }
412
413 static inline int int_urb_interval(struct usb_device *udev)
414 {
415 switch (udev->speed) {
416 case USB_SPEED_HIGH:
417 return 4;
418 case USB_SPEED_LOW:
419 return 10;
420 case USB_SPEED_FULL:
421 default:
422 return 1;
423 }
424 }
425
426 static inline int usb_int_enabled(struct zd_usb *usb)
427 {
428 unsigned long flags;
429 struct zd_usb_interrupt *intr = &usb->intr;
430 struct urb *urb;
431
432 spin_lock_irqsave(&intr->lock, flags);
433 urb = intr->urb;
434 spin_unlock_irqrestore(&intr->lock, flags);
435 return urb != NULL;
436 }
437
438 int zd_usb_enable_int(struct zd_usb *usb)
439 {
440 int r;
441 struct usb_device *udev;
442 struct zd_usb_interrupt *intr = &usb->intr;
443 void *transfer_buffer = NULL;
444 struct urb *urb;
445
446 dev_dbg_f(zd_usb_dev(usb), "\n");
447
448 urb = usb_alloc_urb(0, GFP_KERNEL);
449 if (!urb) {
450 r = -ENOMEM;
451 goto out;
452 }
453
454 ZD_ASSERT(!irqs_disabled());
455 spin_lock_irq(&intr->lock);
456 if (intr->urb) {
457 spin_unlock_irq(&intr->lock);
458 r = 0;
459 goto error_free_urb;
460 }
461 intr->urb = urb;
462 spin_unlock_irq(&intr->lock);
463
464 /* TODO: make it a DMA buffer */
465 r = -ENOMEM;
466 transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
467 if (!transfer_buffer) {
468 dev_dbg_f(zd_usb_dev(usb),
469 "couldn't allocate transfer_buffer\n");
470 goto error_set_urb_null;
471 }
472
473 udev = zd_usb_to_usbdev(usb);
474 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
475 transfer_buffer, USB_MAX_EP_INT_BUFFER,
476 int_urb_complete, usb,
477 intr->interval);
478
479 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
480 r = usb_submit_urb(urb, GFP_KERNEL);
481 if (r) {
482 dev_dbg_f(zd_usb_dev(usb),
483 "Couldn't submit urb. Error number %d\n", r);
484 goto error;
485 }
486
487 return 0;
488 error:
489 kfree(transfer_buffer);
490 error_set_urb_null:
491 spin_lock_irq(&intr->lock);
492 intr->urb = NULL;
493 spin_unlock_irq(&intr->lock);
494 error_free_urb:
495 usb_free_urb(urb);
496 out:
497 return r;
498 }
499
500 void zd_usb_disable_int(struct zd_usb *usb)
501 {
502 unsigned long flags;
503 struct zd_usb_interrupt *intr = &usb->intr;
504 struct urb *urb;
505
506 spin_lock_irqsave(&intr->lock, flags);
507 urb = intr->urb;
508 if (!urb) {
509 spin_unlock_irqrestore(&intr->lock, flags);
510 return;
511 }
512 intr->urb = NULL;
513 spin_unlock_irqrestore(&intr->lock, flags);
514
515 usb_kill_urb(urb);
516 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
517 usb_free_urb(urb);
518 }
519
520 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
521 unsigned int length)
522 {
523 int i;
524 const struct rx_length_info *length_info;
525
526 if (length < sizeof(struct rx_length_info)) {
527 /* It's not a complete packet anyhow. */
528 return;
529 }
530 length_info = (struct rx_length_info *)
531 (buffer + length - sizeof(struct rx_length_info));
532
533 /* It might be that three frames are merged into a single URB
534 * transaction. We have to check for the length info tag.
535 *
536 * While testing we discovered that length_info might be unaligned,
537 * because if USB transactions are merged, the last packet will not
538 * be padded. Unaligned access might also happen if the length_info
539 * structure is not present.
540 */
541 if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
542 {
543 unsigned int l, k, n;
544 for (i = 0, l = 0;; i++) {
545 k = le16_to_cpu(get_unaligned(&length_info->length[i]));
546 if (k == 0)
547 return;
548 n = l+k;
549 if (n > length)
550 return;
551 zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
552 if (i >= 2)
553 return;
554 l = (n+3) & ~3;
555 }
556 } else {
557 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
558 }
559 }
560
561 static void rx_urb_complete(struct urb *urb)
562 {
563 struct zd_usb *usb;
564 struct zd_usb_rx *rx;
565 const u8 *buffer;
566 unsigned int length;
567
568 switch (urb->status) {
569 case 0:
570 break;
571 case -ESHUTDOWN:
572 case -EINVAL:
573 case -ENODEV:
574 case -ENOENT:
575 case -ECONNRESET:
576 case -EPIPE:
577 return;
578 default:
579 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
580 goto resubmit;
581 }
582
583 buffer = urb->transfer_buffer;
584 length = urb->actual_length;
585 usb = urb->context;
586 rx = &usb->rx;
587
588 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
589 /* If there is an old first fragment, we don't care. */
590 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
591 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
592 spin_lock(&rx->lock);
593 memcpy(rx->fragment, buffer, length);
594 rx->fragment_length = length;
595 spin_unlock(&rx->lock);
596 goto resubmit;
597 }
598
599 spin_lock(&rx->lock);
600 if (rx->fragment_length > 0) {
601 /* We are on a second fragment, we believe */
602 ZD_ASSERT(length + rx->fragment_length <=
603 ARRAY_SIZE(rx->fragment));
604 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
605 memcpy(rx->fragment+rx->fragment_length, buffer, length);
606 handle_rx_packet(usb, rx->fragment,
607 rx->fragment_length + length);
608 rx->fragment_length = 0;
609 spin_unlock(&rx->lock);
610 } else {
611 spin_unlock(&rx->lock);
612 handle_rx_packet(usb, buffer, length);
613 }
614
615 resubmit:
616 usb_submit_urb(urb, GFP_ATOMIC);
617 }
618
619 static struct urb *alloc_rx_urb(struct zd_usb *usb)
620 {
621 struct usb_device *udev = zd_usb_to_usbdev(usb);
622 struct urb *urb;
623 void *buffer;
624
625 urb = usb_alloc_urb(0, GFP_KERNEL);
626 if (!urb)
627 return NULL;
628 buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
629 &urb->transfer_dma);
630 if (!buffer) {
631 usb_free_urb(urb);
632 return NULL;
633 }
634
635 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
636 buffer, USB_MAX_RX_SIZE,
637 rx_urb_complete, usb);
638 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
639
640 return urb;
641 }
642
643 static void free_rx_urb(struct urb *urb)
644 {
645 if (!urb)
646 return;
647 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
648 urb->transfer_buffer, urb->transfer_dma);
649 usb_free_urb(urb);
650 }
651
652 int zd_usb_enable_rx(struct zd_usb *usb)
653 {
654 int i, r;
655 struct zd_usb_rx *rx = &usb->rx;
656 struct urb **urbs;
657
658 dev_dbg_f(zd_usb_dev(usb), "\n");
659
660 r = -ENOMEM;
661 urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
662 if (!urbs)
663 goto error;
664 for (i = 0; i < RX_URBS_COUNT; i++) {
665 urbs[i] = alloc_rx_urb(usb);
666 if (!urbs[i])
667 goto error;
668 }
669
670 ZD_ASSERT(!irqs_disabled());
671 spin_lock_irq(&rx->lock);
672 if (rx->urbs) {
673 spin_unlock_irq(&rx->lock);
674 r = 0;
675 goto error;
676 }
677 rx->urbs = urbs;
678 rx->urbs_count = RX_URBS_COUNT;
679 spin_unlock_irq(&rx->lock);
680
681 for (i = 0; i < RX_URBS_COUNT; i++) {
682 r = usb_submit_urb(urbs[i], GFP_KERNEL);
683 if (r)
684 goto error_submit;
685 }
686
687 return 0;
688 error_submit:
689 for (i = 0; i < RX_URBS_COUNT; i++) {
690 usb_kill_urb(urbs[i]);
691 }
692 spin_lock_irq(&rx->lock);
693 rx->urbs = NULL;
694 rx->urbs_count = 0;
695 spin_unlock_irq(&rx->lock);
696 error:
697 if (urbs) {
698 for (i = 0; i < RX_URBS_COUNT; i++)
699 free_rx_urb(urbs[i]);
700 }
701 return r;
702 }
703
704 void zd_usb_disable_rx(struct zd_usb *usb)
705 {
706 int i;
707 unsigned long flags;
708 struct urb **urbs;
709 unsigned int count;
710 struct zd_usb_rx *rx = &usb->rx;
711
712 spin_lock_irqsave(&rx->lock, flags);
713 urbs = rx->urbs;
714 count = rx->urbs_count;
715 spin_unlock_irqrestore(&rx->lock, flags);
716 if (!urbs)
717 return;
718
719 for (i = 0; i < count; i++) {
720 usb_kill_urb(urbs[i]);
721 free_rx_urb(urbs[i]);
722 }
723 kfree(urbs);
724
725 spin_lock_irqsave(&rx->lock, flags);
726 rx->urbs = NULL;
727 rx->urbs_count = 0;
728 spin_unlock_irqrestore(&rx->lock, flags);
729 }
730
731 /**
732 * zd_usb_disable_tx - disable transmission
733 * @usb: the zd1211rw-private USB structure
734 *
735 * Frees all URBs in the free list and marks the transmission as disabled.
736 */
737 void zd_usb_disable_tx(struct zd_usb *usb)
738 {
739 struct zd_usb_tx *tx = &usb->tx;
740 unsigned long flags;
741 struct list_head *pos, *n;
742
743 spin_lock_irqsave(&tx->lock, flags);
744 list_for_each_safe(pos, n, &tx->free_urb_list) {
745 list_del(pos);
746 usb_free_urb(list_entry(pos, struct urb, urb_list));
747 }
748 tx->enabled = 0;
749 tx->submitted_urbs = 0;
750 /* The stopped state is ignored, relying on ieee80211_wake_queues()
751 * in a potentionally following zd_usb_enable_tx().
752 */
753 spin_unlock_irqrestore(&tx->lock, flags);
754 }
755
756 /**
757 * zd_usb_enable_tx - enables transmission
758 * @usb: a &struct zd_usb pointer
759 *
760 * This function enables transmission and prepares the &zd_usb_tx data
761 * structure.
762 */
763 void zd_usb_enable_tx(struct zd_usb *usb)
764 {
765 unsigned long flags;
766 struct zd_usb_tx *tx = &usb->tx;
767
768 spin_lock_irqsave(&tx->lock, flags);
769 tx->enabled = 1;
770 tx->submitted_urbs = 0;
771 ieee80211_wake_queues(zd_usb_to_hw(usb));
772 tx->stopped = 0;
773 spin_unlock_irqrestore(&tx->lock, flags);
774 }
775
776 /**
777 * alloc_tx_urb - provides an tx URB
778 * @usb: a &struct zd_usb pointer
779 *
780 * Allocates a new URB. If possible takes the urb from the free list in
781 * usb->tx.
782 */
783 static struct urb *alloc_tx_urb(struct zd_usb *usb)
784 {
785 struct zd_usb_tx *tx = &usb->tx;
786 unsigned long flags;
787 struct list_head *entry;
788 struct urb *urb;
789
790 spin_lock_irqsave(&tx->lock, flags);
791 if (list_empty(&tx->free_urb_list)) {
792 urb = usb_alloc_urb(0, GFP_ATOMIC);
793 goto out;
794 }
795 entry = tx->free_urb_list.next;
796 list_del(entry);
797 urb = list_entry(entry, struct urb, urb_list);
798 out:
799 spin_unlock_irqrestore(&tx->lock, flags);
800 return urb;
801 }
802
803 /**
804 * free_tx_urb - frees a used tx URB
805 * @usb: a &struct zd_usb pointer
806 * @urb: URB to be freed
807 *
808 * Frees the the transmission URB, which means to put it on the free URB
809 * list.
810 */
811 static void free_tx_urb(struct zd_usb *usb, struct urb *urb)
812 {
813 struct zd_usb_tx *tx = &usb->tx;
814 unsigned long flags;
815
816 spin_lock_irqsave(&tx->lock, flags);
817 if (!tx->enabled) {
818 usb_free_urb(urb);
819 goto out;
820 }
821 list_add(&urb->urb_list, &tx->free_urb_list);
822 out:
823 spin_unlock_irqrestore(&tx->lock, flags);
824 }
825
826 static void tx_dec_submitted_urbs(struct zd_usb *usb)
827 {
828 struct zd_usb_tx *tx = &usb->tx;
829 unsigned long flags;
830
831 spin_lock_irqsave(&tx->lock, flags);
832 --tx->submitted_urbs;
833 if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
834 ieee80211_wake_queues(zd_usb_to_hw(usb));
835 tx->stopped = 0;
836 }
837 spin_unlock_irqrestore(&tx->lock, flags);
838 }
839
840 static void tx_inc_submitted_urbs(struct zd_usb *usb)
841 {
842 struct zd_usb_tx *tx = &usb->tx;
843 unsigned long flags;
844
845 spin_lock_irqsave(&tx->lock, flags);
846 ++tx->submitted_urbs;
847 if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
848 ieee80211_stop_queues(zd_usb_to_hw(usb));
849 tx->stopped = 1;
850 }
851 spin_unlock_irqrestore(&tx->lock, flags);
852 }
853
854 /**
855 * tx_urb_complete - completes the execution of an URB
856 * @urb: a URB
857 *
858 * This function is called if the URB has been transferred to a device or an
859 * error has happened.
860 */
861 static void tx_urb_complete(struct urb *urb)
862 {
863 int r;
864 struct sk_buff *skb;
865 struct zd_tx_skb_control_block *cb;
866 struct zd_usb *usb;
867
868 switch (urb->status) {
869 case 0:
870 break;
871 case -ESHUTDOWN:
872 case -EINVAL:
873 case -ENODEV:
874 case -ENOENT:
875 case -ECONNRESET:
876 case -EPIPE:
877 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
878 break;
879 default:
880 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
881 goto resubmit;
882 }
883 free_urb:
884 skb = (struct sk_buff *)urb->context;
885 zd_mac_tx_to_dev(skb, urb->status);
886 cb = (struct zd_tx_skb_control_block *)skb->cb;
887 usb = &zd_hw_mac(cb->hw)->chip.usb;
888 free_tx_urb(usb, urb);
889 tx_dec_submitted_urbs(usb);
890 return;
891 resubmit:
892 r = usb_submit_urb(urb, GFP_ATOMIC);
893 if (r) {
894 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
895 goto free_urb;
896 }
897 }
898
899 /**
900 * zd_usb_tx: initiates transfer of a frame of the device
901 *
902 * @usb: the zd1211rw-private USB structure
903 * @skb: a &struct sk_buff pointer
904 *
905 * This function tranmits a frame to the device. It doesn't wait for
906 * completion. The frame must contain the control set and have all the
907 * control set information available.
908 *
909 * The function returns 0 if the transfer has been successfully initiated.
910 */
911 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
912 {
913 int r;
914 struct usb_device *udev = zd_usb_to_usbdev(usb);
915 struct urb *urb;
916
917 urb = alloc_tx_urb(usb);
918 if (!urb) {
919 r = -ENOMEM;
920 goto out;
921 }
922
923 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
924 skb->data, skb->len, tx_urb_complete, skb);
925
926 r = usb_submit_urb(urb, GFP_ATOMIC);
927 if (r)
928 goto error;
929 tx_inc_submitted_urbs(usb);
930 return 0;
931 error:
932 free_tx_urb(usb, urb);
933 out:
934 return r;
935 }
936
937 static inline void init_usb_interrupt(struct zd_usb *usb)
938 {
939 struct zd_usb_interrupt *intr = &usb->intr;
940
941 spin_lock_init(&intr->lock);
942 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
943 init_completion(&intr->read_regs.completion);
944 intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
945 }
946
947 static inline void init_usb_rx(struct zd_usb *usb)
948 {
949 struct zd_usb_rx *rx = &usb->rx;
950 spin_lock_init(&rx->lock);
951 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
952 rx->usb_packet_size = 512;
953 } else {
954 rx->usb_packet_size = 64;
955 }
956 ZD_ASSERT(rx->fragment_length == 0);
957 }
958
959 static inline void init_usb_tx(struct zd_usb *usb)
960 {
961 struct zd_usb_tx *tx = &usb->tx;
962 spin_lock_init(&tx->lock);
963 tx->enabled = 0;
964 tx->stopped = 0;
965 INIT_LIST_HEAD(&tx->free_urb_list);
966 tx->submitted_urbs = 0;
967 }
968
969 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
970 struct usb_interface *intf)
971 {
972 memset(usb, 0, sizeof(*usb));
973 usb->intf = usb_get_intf(intf);
974 usb_set_intfdata(usb->intf, hw);
975 init_usb_interrupt(usb);
976 init_usb_tx(usb);
977 init_usb_rx(usb);
978 }
979
980 void zd_usb_clear(struct zd_usb *usb)
981 {
982 usb_set_intfdata(usb->intf, NULL);
983 usb_put_intf(usb->intf);
984 ZD_MEMCLEAR(usb, sizeof(*usb));
985 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
986 }
987
988 static const char *speed(enum usb_device_speed speed)
989 {
990 switch (speed) {
991 case USB_SPEED_LOW:
992 return "low";
993 case USB_SPEED_FULL:
994 return "full";
995 case USB_SPEED_HIGH:
996 return "high";
997 default:
998 return "unknown speed";
999 }
1000 }
1001
1002 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1003 {
1004 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1005 le16_to_cpu(udev->descriptor.idVendor),
1006 le16_to_cpu(udev->descriptor.idProduct),
1007 get_bcdDevice(udev),
1008 speed(udev->speed));
1009 }
1010
1011 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1012 {
1013 struct usb_device *udev = interface_to_usbdev(usb->intf);
1014 return scnprint_id(udev, buffer, size);
1015 }
1016
1017 #ifdef DEBUG
1018 static void print_id(struct usb_device *udev)
1019 {
1020 char buffer[40];
1021
1022 scnprint_id(udev, buffer, sizeof(buffer));
1023 buffer[sizeof(buffer)-1] = 0;
1024 dev_dbg_f(&udev->dev, "%s\n", buffer);
1025 }
1026 #else
1027 #define print_id(udev) do { } while (0)
1028 #endif
1029
1030 static int eject_installer(struct usb_interface *intf)
1031 {
1032 struct usb_device *udev = interface_to_usbdev(intf);
1033 struct usb_host_interface *iface_desc = &intf->altsetting[0];
1034 struct usb_endpoint_descriptor *endpoint;
1035 unsigned char *cmd;
1036 u8 bulk_out_ep;
1037 int r;
1038
1039 /* Find bulk out endpoint */
1040 endpoint = &iface_desc->endpoint[1].desc;
1041 if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
1042 (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
1043 USB_ENDPOINT_XFER_BULK) {
1044 bulk_out_ep = endpoint->bEndpointAddress;
1045 } else {
1046 dev_err(&udev->dev,
1047 "zd1211rw: Could not find bulk out endpoint\n");
1048 return -ENODEV;
1049 }
1050
1051 cmd = kzalloc(31, GFP_KERNEL);
1052 if (cmd == NULL)
1053 return -ENODEV;
1054
1055 /* USB bulk command block */
1056 cmd[0] = 0x55; /* bulk command signature */
1057 cmd[1] = 0x53; /* bulk command signature */
1058 cmd[2] = 0x42; /* bulk command signature */
1059 cmd[3] = 0x43; /* bulk command signature */
1060 cmd[14] = 6; /* command length */
1061
1062 cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1063 cmd[19] = 0x2; /* eject disc */
1064
1065 dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1066 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1067 cmd, 31, NULL, 2000);
1068 kfree(cmd);
1069 if (r)
1070 return r;
1071
1072 /* At this point, the device disconnects and reconnects with the real
1073 * ID numbers. */
1074
1075 usb_set_intfdata(intf, NULL);
1076 return 0;
1077 }
1078
1079 int zd_usb_init_hw(struct zd_usb *usb)
1080 {
1081 int r;
1082 struct zd_mac *mac = zd_usb_to_mac(usb);
1083
1084 dev_dbg_f(zd_usb_dev(usb), "\n");
1085
1086 r = upload_firmware(usb);
1087 if (r) {
1088 dev_err(zd_usb_dev(usb),
1089 "couldn't load firmware. Error number %d\n", r);
1090 return r;
1091 }
1092
1093 r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1094 if (r) {
1095 dev_dbg_f(zd_usb_dev(usb),
1096 "couldn't reset configuration. Error number %d\n", r);
1097 return r;
1098 }
1099
1100 r = zd_mac_init_hw(mac->hw);
1101 if (r) {
1102 dev_dbg_f(zd_usb_dev(usb),
1103 "couldn't initialize mac. Error number %d\n", r);
1104 return r;
1105 }
1106
1107 usb->initialized = 1;
1108 return 0;
1109 }
1110
1111 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1112 {
1113 int r;
1114 struct usb_device *udev = interface_to_usbdev(intf);
1115 struct zd_usb *usb;
1116 struct ieee80211_hw *hw = NULL;
1117
1118 print_id(udev);
1119
1120 if (id->driver_info & DEVICE_INSTALLER)
1121 return eject_installer(intf);
1122
1123 switch (udev->speed) {
1124 case USB_SPEED_LOW:
1125 case USB_SPEED_FULL:
1126 case USB_SPEED_HIGH:
1127 break;
1128 default:
1129 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1130 r = -ENODEV;
1131 goto error;
1132 }
1133
1134 r = usb_reset_device(udev);
1135 if (r) {
1136 dev_err(&intf->dev,
1137 "couldn't reset usb device. Error number %d\n", r);
1138 goto error;
1139 }
1140
1141 hw = zd_mac_alloc_hw(intf);
1142 if (hw == NULL) {
1143 r = -ENOMEM;
1144 goto error;
1145 }
1146
1147 usb = &zd_hw_mac(hw)->chip.usb;
1148 usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1149
1150 r = zd_mac_preinit_hw(hw);
1151 if (r) {
1152 dev_dbg_f(&intf->dev,
1153 "couldn't initialize mac. Error number %d\n", r);
1154 goto error;
1155 }
1156
1157 r = ieee80211_register_hw(hw);
1158 if (r) {
1159 dev_dbg_f(&intf->dev,
1160 "couldn't register device. Error number %d\n", r);
1161 goto error;
1162 }
1163
1164 dev_dbg_f(&intf->dev, "successful\n");
1165 dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
1166 return 0;
1167 error:
1168 usb_reset_device(interface_to_usbdev(intf));
1169 if (hw) {
1170 zd_mac_clear(zd_hw_mac(hw));
1171 ieee80211_free_hw(hw);
1172 }
1173 return r;
1174 }
1175
1176 static void disconnect(struct usb_interface *intf)
1177 {
1178 struct ieee80211_hw *hw = zd_intf_to_hw(intf);
1179 struct zd_mac *mac;
1180 struct zd_usb *usb;
1181
1182 /* Either something really bad happened, or we're just dealing with
1183 * a DEVICE_INSTALLER. */
1184 if (hw == NULL)
1185 return;
1186
1187 mac = zd_hw_mac(hw);
1188 usb = &mac->chip.usb;
1189
1190 dev_dbg_f(zd_usb_dev(usb), "\n");
1191
1192 ieee80211_unregister_hw(hw);
1193
1194 /* Just in case something has gone wrong! */
1195 zd_usb_disable_rx(usb);
1196 zd_usb_disable_int(usb);
1197
1198 /* If the disconnect has been caused by a removal of the
1199 * driver module, the reset allows reloading of the driver. If the
1200 * reset will not be executed here, the upload of the firmware in the
1201 * probe function caused by the reloading of the driver will fail.
1202 */
1203 usb_reset_device(interface_to_usbdev(intf));
1204
1205 zd_mac_clear(mac);
1206 ieee80211_free_hw(hw);
1207 dev_dbg(&intf->dev, "disconnected\n");
1208 }
1209
1210 static struct usb_driver driver = {
1211 .name = KBUILD_MODNAME,
1212 .id_table = usb_ids,
1213 .probe = probe,
1214 .disconnect = disconnect,
1215 };
1216
1217 struct workqueue_struct *zd_workqueue;
1218
1219 static int __init usb_init(void)
1220 {
1221 int r;
1222
1223 pr_debug("%s usb_init()\n", driver.name);
1224
1225 zd_workqueue = create_singlethread_workqueue(driver.name);
1226 if (zd_workqueue == NULL) {
1227 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1228 return -ENOMEM;
1229 }
1230
1231 r = usb_register(&driver);
1232 if (r) {
1233 destroy_workqueue(zd_workqueue);
1234 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1235 driver.name, r);
1236 return r;
1237 }
1238
1239 pr_debug("%s initialized\n", driver.name);
1240 return 0;
1241 }
1242
1243 static void __exit usb_exit(void)
1244 {
1245 pr_debug("%s usb_exit()\n", driver.name);
1246 usb_deregister(&driver);
1247 destroy_workqueue(zd_workqueue);
1248 }
1249
1250 module_init(usb_init);
1251 module_exit(usb_exit);
1252
1253 static int usb_int_regs_length(unsigned int count)
1254 {
1255 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1256 }
1257
1258 static void prepare_read_regs_int(struct zd_usb *usb)
1259 {
1260 struct zd_usb_interrupt *intr = &usb->intr;
1261
1262 spin_lock_irq(&intr->lock);
1263 intr->read_regs_enabled = 1;
1264 INIT_COMPLETION(intr->read_regs.completion);
1265 spin_unlock_irq(&intr->lock);
1266 }
1267
1268 static void disable_read_regs_int(struct zd_usb *usb)
1269 {
1270 struct zd_usb_interrupt *intr = &usb->intr;
1271
1272 spin_lock_irq(&intr->lock);
1273 intr->read_regs_enabled = 0;
1274 spin_unlock_irq(&intr->lock);
1275 }
1276
1277 static int get_results(struct zd_usb *usb, u16 *values,
1278 struct usb_req_read_regs *req, unsigned int count)
1279 {
1280 int r;
1281 int i;
1282 struct zd_usb_interrupt *intr = &usb->intr;
1283 struct read_regs_int *rr = &intr->read_regs;
1284 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1285
1286 spin_lock_irq(&intr->lock);
1287
1288 r = -EIO;
1289 /* The created block size seems to be larger than expected.
1290 * However results appear to be correct.
1291 */
1292 if (rr->length < usb_int_regs_length(count)) {
1293 dev_dbg_f(zd_usb_dev(usb),
1294 "error: actual length %d less than expected %d\n",
1295 rr->length, usb_int_regs_length(count));
1296 goto error_unlock;
1297 }
1298 if (rr->length > sizeof(rr->buffer)) {
1299 dev_dbg_f(zd_usb_dev(usb),
1300 "error: actual length %d exceeds buffer size %zu\n",
1301 rr->length, sizeof(rr->buffer));
1302 goto error_unlock;
1303 }
1304
1305 for (i = 0; i < count; i++) {
1306 struct reg_data *rd = &regs->regs[i];
1307 if (rd->addr != req->addr[i]) {
1308 dev_dbg_f(zd_usb_dev(usb),
1309 "rd[%d] addr %#06hx expected %#06hx\n", i,
1310 le16_to_cpu(rd->addr),
1311 le16_to_cpu(req->addr[i]));
1312 goto error_unlock;
1313 }
1314 values[i] = le16_to_cpu(rd->value);
1315 }
1316
1317 r = 0;
1318 error_unlock:
1319 spin_unlock_irq(&intr->lock);
1320 return r;
1321 }
1322
1323 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1324 const zd_addr_t *addresses, unsigned int count)
1325 {
1326 int r;
1327 int i, req_len, actual_req_len;
1328 struct usb_device *udev;
1329 struct usb_req_read_regs *req = NULL;
1330 unsigned long timeout;
1331
1332 if (count < 1) {
1333 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1334 return -EINVAL;
1335 }
1336 if (count > USB_MAX_IOREAD16_COUNT) {
1337 dev_dbg_f(zd_usb_dev(usb),
1338 "error: count %u exceeds possible max %u\n",
1339 count, USB_MAX_IOREAD16_COUNT);
1340 return -EINVAL;
1341 }
1342 if (in_atomic()) {
1343 dev_dbg_f(zd_usb_dev(usb),
1344 "error: io in atomic context not supported\n");
1345 return -EWOULDBLOCK;
1346 }
1347 if (!usb_int_enabled(usb)) {
1348 dev_dbg_f(zd_usb_dev(usb),
1349 "error: usb interrupt not enabled\n");
1350 return -EWOULDBLOCK;
1351 }
1352
1353 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1354 req = kmalloc(req_len, GFP_KERNEL);
1355 if (!req)
1356 return -ENOMEM;
1357 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1358 for (i = 0; i < count; i++)
1359 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1360
1361 udev = zd_usb_to_usbdev(usb);
1362 prepare_read_regs_int(usb);
1363 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1364 req, req_len, &actual_req_len, 1000 /* ms */);
1365 if (r) {
1366 dev_dbg_f(zd_usb_dev(usb),
1367 "error in usb_bulk_msg(). Error number %d\n", r);
1368 goto error;
1369 }
1370 if (req_len != actual_req_len) {
1371 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1372 " req_len %d != actual_req_len %d\n",
1373 req_len, actual_req_len);
1374 r = -EIO;
1375 goto error;
1376 }
1377
1378 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1379 msecs_to_jiffies(1000));
1380 if (!timeout) {
1381 disable_read_regs_int(usb);
1382 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1383 r = -ETIMEDOUT;
1384 goto error;
1385 }
1386
1387 r = get_results(usb, values, req, count);
1388 error:
1389 kfree(req);
1390 return r;
1391 }
1392
1393 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1394 unsigned int count)
1395 {
1396 int r;
1397 struct usb_device *udev;
1398 struct usb_req_write_regs *req = NULL;
1399 int i, req_len, actual_req_len;
1400
1401 if (count == 0)
1402 return 0;
1403 if (count > USB_MAX_IOWRITE16_COUNT) {
1404 dev_dbg_f(zd_usb_dev(usb),
1405 "error: count %u exceeds possible max %u\n",
1406 count, USB_MAX_IOWRITE16_COUNT);
1407 return -EINVAL;
1408 }
1409 if (in_atomic()) {
1410 dev_dbg_f(zd_usb_dev(usb),
1411 "error: io in atomic context not supported\n");
1412 return -EWOULDBLOCK;
1413 }
1414
1415 req_len = sizeof(struct usb_req_write_regs) +
1416 count * sizeof(struct reg_data);
1417 req = kmalloc(req_len, GFP_KERNEL);
1418 if (!req)
1419 return -ENOMEM;
1420
1421 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1422 for (i = 0; i < count; i++) {
1423 struct reg_data *rw = &req->reg_writes[i];
1424 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1425 rw->value = cpu_to_le16(ioreqs[i].value);
1426 }
1427
1428 udev = zd_usb_to_usbdev(usb);
1429 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1430 req, req_len, &actual_req_len, 1000 /* ms */);
1431 if (r) {
1432 dev_dbg_f(zd_usb_dev(usb),
1433 "error in usb_bulk_msg(). Error number %d\n", r);
1434 goto error;
1435 }
1436 if (req_len != actual_req_len) {
1437 dev_dbg_f(zd_usb_dev(usb),
1438 "error in usb_bulk_msg()"
1439 " req_len %d != actual_req_len %d\n",
1440 req_len, actual_req_len);
1441 r = -EIO;
1442 goto error;
1443 }
1444
1445 /* FALL-THROUGH with r == 0 */
1446 error:
1447 kfree(req);
1448 return r;
1449 }
1450
1451 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1452 {
1453 int r;
1454 struct usb_device *udev;
1455 struct usb_req_rfwrite *req = NULL;
1456 int i, req_len, actual_req_len;
1457 u16 bit_value_template;
1458
1459 if (in_atomic()) {
1460 dev_dbg_f(zd_usb_dev(usb),
1461 "error: io in atomic context not supported\n");
1462 return -EWOULDBLOCK;
1463 }
1464 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1465 dev_dbg_f(zd_usb_dev(usb),
1466 "error: bits %d are smaller than"
1467 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1468 bits, USB_MIN_RFWRITE_BIT_COUNT);
1469 return -EINVAL;
1470 }
1471 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1472 dev_dbg_f(zd_usb_dev(usb),
1473 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1474 bits, USB_MAX_RFWRITE_BIT_COUNT);
1475 return -EINVAL;
1476 }
1477 #ifdef DEBUG
1478 if (value & (~0UL << bits)) {
1479 dev_dbg_f(zd_usb_dev(usb),
1480 "error: value %#09x has bits >= %d set\n",
1481 value, bits);
1482 return -EINVAL;
1483 }
1484 #endif /* DEBUG */
1485
1486 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1487
1488 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1489 if (r) {
1490 dev_dbg_f(zd_usb_dev(usb),
1491 "error %d: Couldn't read CR203\n", r);
1492 goto out;
1493 }
1494 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1495
1496 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1497 req = kmalloc(req_len, GFP_KERNEL);
1498 if (!req)
1499 return -ENOMEM;
1500
1501 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1502 /* 1: 3683a, but not used in ZYDAS driver */
1503 req->value = cpu_to_le16(2);
1504 req->bits = cpu_to_le16(bits);
1505
1506 for (i = 0; i < bits; i++) {
1507 u16 bv = bit_value_template;
1508 if (value & (1 << (bits-1-i)))
1509 bv |= RF_DATA;
1510 req->bit_values[i] = cpu_to_le16(bv);
1511 }
1512
1513 udev = zd_usb_to_usbdev(usb);
1514 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1515 req, req_len, &actual_req_len, 1000 /* ms */);
1516 if (r) {
1517 dev_dbg_f(zd_usb_dev(usb),
1518 "error in usb_bulk_msg(). Error number %d\n", r);
1519 goto out;
1520 }
1521 if (req_len != actual_req_len) {
1522 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1523 " req_len %d != actual_req_len %d\n",
1524 req_len, actual_req_len);
1525 r = -EIO;
1526 goto out;
1527 }
1528
1529 /* FALL-THROUGH with r == 0 */
1530 out:
1531 kfree(req);
1532 return r;
1533 }
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