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mac80211/drivers: rewrite the rate control API
[deliverable/linux.git] / drivers / net / wireless / zd1211rw / zd_usb.c
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 { USB_DEVICE(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 },
62 /* ZD1211B */
63 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
64 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
65 { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
66 { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
67 { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
68 { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
69 { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
70 { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
71 { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
72 { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
73 { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
74 { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
75 { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
76 { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
77 { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
78 { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
79 { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
80 { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
81 { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
82 { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
83 { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
84 { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
85 /* "Driverless" devices that need ejecting */
86 { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
87 { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
88 {}
89 };
90
91 MODULE_LICENSE("GPL");
92 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
93 MODULE_AUTHOR("Ulrich Kunitz");
94 MODULE_AUTHOR("Daniel Drake");
95 MODULE_VERSION("1.0");
96 MODULE_DEVICE_TABLE(usb, usb_ids);
97
98 #define FW_ZD1211_PREFIX "zd1211/zd1211_"
99 #define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
100
101 /* USB device initialization */
102 static void int_urb_complete(struct urb *urb);
103
104 static int request_fw_file(
105 const struct firmware **fw, const char *name, struct device *device)
106 {
107 int r;
108
109 dev_dbg_f(device, "fw name %s\n", name);
110
111 r = request_firmware(fw, name, device);
112 if (r)
113 dev_err(device,
114 "Could not load firmware file %s. Error number %d\n",
115 name, r);
116 return r;
117 }
118
119 static inline u16 get_bcdDevice(const struct usb_device *udev)
120 {
121 return le16_to_cpu(udev->descriptor.bcdDevice);
122 }
123
124 enum upload_code_flags {
125 REBOOT = 1,
126 };
127
128 /* Ensures that MAX_TRANSFER_SIZE is even. */
129 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
130
131 static int upload_code(struct usb_device *udev,
132 const u8 *data, size_t size, u16 code_offset, int flags)
133 {
134 u8 *p;
135 int r;
136
137 /* USB request blocks need "kmalloced" buffers.
138 */
139 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
140 if (!p) {
141 dev_err(&udev->dev, "out of memory\n");
142 r = -ENOMEM;
143 goto error;
144 }
145
146 size &= ~1;
147 while (size > 0) {
148 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
149 size : MAX_TRANSFER_SIZE;
150
151 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
152
153 memcpy(p, data, transfer_size);
154 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
155 USB_REQ_FIRMWARE_DOWNLOAD,
156 USB_DIR_OUT | USB_TYPE_VENDOR,
157 code_offset, 0, p, transfer_size, 1000 /* ms */);
158 if (r < 0) {
159 dev_err(&udev->dev,
160 "USB control request for firmware upload"
161 " failed. Error number %d\n", r);
162 goto error;
163 }
164 transfer_size = r & ~1;
165
166 size -= transfer_size;
167 data += transfer_size;
168 code_offset += transfer_size/sizeof(u16);
169 }
170
171 if (flags & REBOOT) {
172 u8 ret;
173
174 /* Use "DMA-aware" buffer. */
175 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
176 USB_REQ_FIRMWARE_CONFIRM,
177 USB_DIR_IN | USB_TYPE_VENDOR,
178 0, 0, p, sizeof(ret), 5000 /* ms */);
179 if (r != sizeof(ret)) {
180 dev_err(&udev->dev,
181 "control request firmeware confirmation failed."
182 " Return value %d\n", r);
183 if (r >= 0)
184 r = -ENODEV;
185 goto error;
186 }
187 ret = p[0];
188 if (ret & 0x80) {
189 dev_err(&udev->dev,
190 "Internal error while downloading."
191 " Firmware confirm return value %#04x\n",
192 (unsigned int)ret);
193 r = -ENODEV;
194 goto error;
195 }
196 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
197 (unsigned int)ret);
198 }
199
200 r = 0;
201 error:
202 kfree(p);
203 return r;
204 }
205
206 static u16 get_word(const void *data, u16 offset)
207 {
208 const __le16 *p = data;
209 return le16_to_cpu(p[offset]);
210 }
211
212 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
213 const char* postfix)
214 {
215 scnprintf(buffer, size, "%s%s",
216 usb->is_zd1211b ?
217 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
218 postfix);
219 return buffer;
220 }
221
222 static int handle_version_mismatch(struct zd_usb *usb,
223 const struct firmware *ub_fw)
224 {
225 struct usb_device *udev = zd_usb_to_usbdev(usb);
226 const struct firmware *ur_fw = NULL;
227 int offset;
228 int r = 0;
229 char fw_name[128];
230
231 r = request_fw_file(&ur_fw,
232 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
233 &udev->dev);
234 if (r)
235 goto error;
236
237 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
238 if (r)
239 goto error;
240
241 offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
242 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
243 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
244
245 /* At this point, the vendor driver downloads the whole firmware
246 * image, hacks around with version IDs, and uploads it again,
247 * completely overwriting the boot code. We do not do this here as
248 * it is not required on any tested devices, and it is suspected to
249 * cause problems. */
250 error:
251 release_firmware(ur_fw);
252 return r;
253 }
254
255 static int upload_firmware(struct zd_usb *usb)
256 {
257 int r;
258 u16 fw_bcdDevice;
259 u16 bcdDevice;
260 struct usb_device *udev = zd_usb_to_usbdev(usb);
261 const struct firmware *ub_fw = NULL;
262 const struct firmware *uph_fw = NULL;
263 char fw_name[128];
264
265 bcdDevice = get_bcdDevice(udev);
266
267 r = request_fw_file(&ub_fw,
268 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
269 &udev->dev);
270 if (r)
271 goto error;
272
273 fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
274
275 if (fw_bcdDevice != bcdDevice) {
276 dev_info(&udev->dev,
277 "firmware version %#06x and device bootcode version "
278 "%#06x differ\n", fw_bcdDevice, bcdDevice);
279 if (bcdDevice <= 0x4313)
280 dev_warn(&udev->dev, "device has old bootcode, please "
281 "report success or failure\n");
282
283 r = handle_version_mismatch(usb, ub_fw);
284 if (r)
285 goto error;
286 } else {
287 dev_dbg_f(&udev->dev,
288 "firmware device id %#06x is equal to the "
289 "actual device id\n", fw_bcdDevice);
290 }
291
292
293 r = request_fw_file(&uph_fw,
294 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
295 &udev->dev);
296 if (r)
297 goto error;
298
299 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
300 if (r) {
301 dev_err(&udev->dev,
302 "Could not upload firmware code uph. Error number %d\n",
303 r);
304 }
305
306 /* FALL-THROUGH */
307 error:
308 release_firmware(ub_fw);
309 release_firmware(uph_fw);
310 return r;
311 }
312
313 /* Read data from device address space using "firmware interface" which does
314 * not require firmware to be loaded. */
315 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
316 {
317 int r;
318 struct usb_device *udev = zd_usb_to_usbdev(usb);
319 u8 *buf;
320
321 /* Use "DMA-aware" buffer. */
322 buf = kmalloc(len, GFP_KERNEL);
323 if (!buf)
324 return -ENOMEM;
325 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
326 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
327 buf, len, 5000);
328 if (r < 0) {
329 dev_err(&udev->dev,
330 "read over firmware interface failed: %d\n", r);
331 goto exit;
332 } else if (r != len) {
333 dev_err(&udev->dev,
334 "incomplete read over firmware interface: %d/%d\n",
335 r, len);
336 r = -EIO;
337 goto exit;
338 }
339 r = 0;
340 memcpy(data, buf, len);
341 exit:
342 kfree(buf);
343 return r;
344 }
345
346 #define urb_dev(urb) (&(urb)->dev->dev)
347
348 static inline void handle_regs_int(struct urb *urb)
349 {
350 struct zd_usb *usb = urb->context;
351 struct zd_usb_interrupt *intr = &usb->intr;
352 int len;
353 u16 int_num;
354
355 ZD_ASSERT(in_interrupt());
356 spin_lock(&intr->lock);
357
358 int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
359 if (int_num == CR_INTERRUPT) {
360 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
361 memcpy(&mac->intr_buffer, urb->transfer_buffer,
362 USB_MAX_EP_INT_BUFFER);
363 schedule_work(&mac->process_intr);
364 } else if (intr->read_regs_enabled) {
365 intr->read_regs.length = len = urb->actual_length;
366
367 if (len > sizeof(intr->read_regs.buffer))
368 len = sizeof(intr->read_regs.buffer);
369 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
370 intr->read_regs_enabled = 0;
371 complete(&intr->read_regs.completion);
372 goto out;
373 }
374
375 out:
376 spin_unlock(&intr->lock);
377 }
378
379 static void int_urb_complete(struct urb *urb)
380 {
381 int r;
382 struct usb_int_header *hdr;
383
384 switch (urb->status) {
385 case 0:
386 break;
387 case -ESHUTDOWN:
388 case -EINVAL:
389 case -ENODEV:
390 case -ENOENT:
391 case -ECONNRESET:
392 case -EPIPE:
393 goto kfree;
394 default:
395 goto resubmit;
396 }
397
398 if (urb->actual_length < sizeof(hdr)) {
399 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
400 goto resubmit;
401 }
402
403 hdr = urb->transfer_buffer;
404 if (hdr->type != USB_INT_TYPE) {
405 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
406 goto resubmit;
407 }
408
409 switch (hdr->id) {
410 case USB_INT_ID_REGS:
411 handle_regs_int(urb);
412 break;
413 case USB_INT_ID_RETRY_FAILED:
414 zd_mac_tx_failed(zd_usb_to_hw(urb->context));
415 break;
416 default:
417 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
418 (unsigned int)hdr->id);
419 goto resubmit;
420 }
421
422 resubmit:
423 r = usb_submit_urb(urb, GFP_ATOMIC);
424 if (r) {
425 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
426 goto kfree;
427 }
428 return;
429 kfree:
430 kfree(urb->transfer_buffer);
431 }
432
433 static inline int int_urb_interval(struct usb_device *udev)
434 {
435 switch (udev->speed) {
436 case USB_SPEED_HIGH:
437 return 4;
438 case USB_SPEED_LOW:
439 return 10;
440 case USB_SPEED_FULL:
441 default:
442 return 1;
443 }
444 }
445
446 static inline int usb_int_enabled(struct zd_usb *usb)
447 {
448 unsigned long flags;
449 struct zd_usb_interrupt *intr = &usb->intr;
450 struct urb *urb;
451
452 spin_lock_irqsave(&intr->lock, flags);
453 urb = intr->urb;
454 spin_unlock_irqrestore(&intr->lock, flags);
455 return urb != NULL;
456 }
457
458 int zd_usb_enable_int(struct zd_usb *usb)
459 {
460 int r;
461 struct usb_device *udev;
462 struct zd_usb_interrupt *intr = &usb->intr;
463 void *transfer_buffer = NULL;
464 struct urb *urb;
465
466 dev_dbg_f(zd_usb_dev(usb), "\n");
467
468 urb = usb_alloc_urb(0, GFP_KERNEL);
469 if (!urb) {
470 r = -ENOMEM;
471 goto out;
472 }
473
474 ZD_ASSERT(!irqs_disabled());
475 spin_lock_irq(&intr->lock);
476 if (intr->urb) {
477 spin_unlock_irq(&intr->lock);
478 r = 0;
479 goto error_free_urb;
480 }
481 intr->urb = urb;
482 spin_unlock_irq(&intr->lock);
483
484 /* TODO: make it a DMA buffer */
485 r = -ENOMEM;
486 transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
487 if (!transfer_buffer) {
488 dev_dbg_f(zd_usb_dev(usb),
489 "couldn't allocate transfer_buffer\n");
490 goto error_set_urb_null;
491 }
492
493 udev = zd_usb_to_usbdev(usb);
494 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
495 transfer_buffer, USB_MAX_EP_INT_BUFFER,
496 int_urb_complete, usb,
497 intr->interval);
498
499 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
500 r = usb_submit_urb(urb, GFP_KERNEL);
501 if (r) {
502 dev_dbg_f(zd_usb_dev(usb),
503 "Couldn't submit urb. Error number %d\n", r);
504 goto error;
505 }
506
507 return 0;
508 error:
509 kfree(transfer_buffer);
510 error_set_urb_null:
511 spin_lock_irq(&intr->lock);
512 intr->urb = NULL;
513 spin_unlock_irq(&intr->lock);
514 error_free_urb:
515 usb_free_urb(urb);
516 out:
517 return r;
518 }
519
520 void zd_usb_disable_int(struct zd_usb *usb)
521 {
522 unsigned long flags;
523 struct zd_usb_interrupt *intr = &usb->intr;
524 struct urb *urb;
525
526 spin_lock_irqsave(&intr->lock, flags);
527 urb = intr->urb;
528 if (!urb) {
529 spin_unlock_irqrestore(&intr->lock, flags);
530 return;
531 }
532 intr->urb = NULL;
533 spin_unlock_irqrestore(&intr->lock, flags);
534
535 usb_kill_urb(urb);
536 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
537 usb_free_urb(urb);
538 }
539
540 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
541 unsigned int length)
542 {
543 int i;
544 const struct rx_length_info *length_info;
545
546 if (length < sizeof(struct rx_length_info)) {
547 /* It's not a complete packet anyhow. */
548 return;
549 }
550 length_info = (struct rx_length_info *)
551 (buffer + length - sizeof(struct rx_length_info));
552
553 /* It might be that three frames are merged into a single URB
554 * transaction. We have to check for the length info tag.
555 *
556 * While testing we discovered that length_info might be unaligned,
557 * because if USB transactions are merged, the last packet will not
558 * be padded. Unaligned access might also happen if the length_info
559 * structure is not present.
560 */
561 if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
562 {
563 unsigned int l, k, n;
564 for (i = 0, l = 0;; i++) {
565 k = get_unaligned_le16(&length_info->length[i]);
566 if (k == 0)
567 return;
568 n = l+k;
569 if (n > length)
570 return;
571 zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
572 if (i >= 2)
573 return;
574 l = (n+3) & ~3;
575 }
576 } else {
577 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
578 }
579 }
580
581 static void rx_urb_complete(struct urb *urb)
582 {
583 struct zd_usb *usb;
584 struct zd_usb_rx *rx;
585 const u8 *buffer;
586 unsigned int length;
587
588 switch (urb->status) {
589 case 0:
590 break;
591 case -ESHUTDOWN:
592 case -EINVAL:
593 case -ENODEV:
594 case -ENOENT:
595 case -ECONNRESET:
596 case -EPIPE:
597 return;
598 default:
599 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
600 goto resubmit;
601 }
602
603 buffer = urb->transfer_buffer;
604 length = urb->actual_length;
605 usb = urb->context;
606 rx = &usb->rx;
607
608 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
609 /* If there is an old first fragment, we don't care. */
610 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
611 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
612 spin_lock(&rx->lock);
613 memcpy(rx->fragment, buffer, length);
614 rx->fragment_length = length;
615 spin_unlock(&rx->lock);
616 goto resubmit;
617 }
618
619 spin_lock(&rx->lock);
620 if (rx->fragment_length > 0) {
621 /* We are on a second fragment, we believe */
622 ZD_ASSERT(length + rx->fragment_length <=
623 ARRAY_SIZE(rx->fragment));
624 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
625 memcpy(rx->fragment+rx->fragment_length, buffer, length);
626 handle_rx_packet(usb, rx->fragment,
627 rx->fragment_length + length);
628 rx->fragment_length = 0;
629 spin_unlock(&rx->lock);
630 } else {
631 spin_unlock(&rx->lock);
632 handle_rx_packet(usb, buffer, length);
633 }
634
635 resubmit:
636 usb_submit_urb(urb, GFP_ATOMIC);
637 }
638
639 static struct urb *alloc_rx_urb(struct zd_usb *usb)
640 {
641 struct usb_device *udev = zd_usb_to_usbdev(usb);
642 struct urb *urb;
643 void *buffer;
644
645 urb = usb_alloc_urb(0, GFP_KERNEL);
646 if (!urb)
647 return NULL;
648 buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
649 &urb->transfer_dma);
650 if (!buffer) {
651 usb_free_urb(urb);
652 return NULL;
653 }
654
655 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
656 buffer, USB_MAX_RX_SIZE,
657 rx_urb_complete, usb);
658 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
659
660 return urb;
661 }
662
663 static void free_rx_urb(struct urb *urb)
664 {
665 if (!urb)
666 return;
667 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
668 urb->transfer_buffer, urb->transfer_dma);
669 usb_free_urb(urb);
670 }
671
672 int zd_usb_enable_rx(struct zd_usb *usb)
673 {
674 int i, r;
675 struct zd_usb_rx *rx = &usb->rx;
676 struct urb **urbs;
677
678 dev_dbg_f(zd_usb_dev(usb), "\n");
679
680 r = -ENOMEM;
681 urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
682 if (!urbs)
683 goto error;
684 for (i = 0; i < RX_URBS_COUNT; i++) {
685 urbs[i] = alloc_rx_urb(usb);
686 if (!urbs[i])
687 goto error;
688 }
689
690 ZD_ASSERT(!irqs_disabled());
691 spin_lock_irq(&rx->lock);
692 if (rx->urbs) {
693 spin_unlock_irq(&rx->lock);
694 r = 0;
695 goto error;
696 }
697 rx->urbs = urbs;
698 rx->urbs_count = RX_URBS_COUNT;
699 spin_unlock_irq(&rx->lock);
700
701 for (i = 0; i < RX_URBS_COUNT; i++) {
702 r = usb_submit_urb(urbs[i], GFP_KERNEL);
703 if (r)
704 goto error_submit;
705 }
706
707 return 0;
708 error_submit:
709 for (i = 0; i < RX_URBS_COUNT; i++) {
710 usb_kill_urb(urbs[i]);
711 }
712 spin_lock_irq(&rx->lock);
713 rx->urbs = NULL;
714 rx->urbs_count = 0;
715 spin_unlock_irq(&rx->lock);
716 error:
717 if (urbs) {
718 for (i = 0; i < RX_URBS_COUNT; i++)
719 free_rx_urb(urbs[i]);
720 }
721 return r;
722 }
723
724 void zd_usb_disable_rx(struct zd_usb *usb)
725 {
726 int i;
727 unsigned long flags;
728 struct urb **urbs;
729 unsigned int count;
730 struct zd_usb_rx *rx = &usb->rx;
731
732 spin_lock_irqsave(&rx->lock, flags);
733 urbs = rx->urbs;
734 count = rx->urbs_count;
735 spin_unlock_irqrestore(&rx->lock, flags);
736 if (!urbs)
737 return;
738
739 for (i = 0; i < count; i++) {
740 usb_kill_urb(urbs[i]);
741 free_rx_urb(urbs[i]);
742 }
743 kfree(urbs);
744
745 spin_lock_irqsave(&rx->lock, flags);
746 rx->urbs = NULL;
747 rx->urbs_count = 0;
748 spin_unlock_irqrestore(&rx->lock, flags);
749 }
750
751 /**
752 * zd_usb_disable_tx - disable transmission
753 * @usb: the zd1211rw-private USB structure
754 *
755 * Frees all URBs in the free list and marks the transmission as disabled.
756 */
757 void zd_usb_disable_tx(struct zd_usb *usb)
758 {
759 struct zd_usb_tx *tx = &usb->tx;
760 unsigned long flags;
761 struct list_head *pos, *n;
762
763 spin_lock_irqsave(&tx->lock, flags);
764 list_for_each_safe(pos, n, &tx->free_urb_list) {
765 list_del(pos);
766 usb_free_urb(list_entry(pos, struct urb, urb_list));
767 }
768 tx->enabled = 0;
769 tx->submitted_urbs = 0;
770 /* The stopped state is ignored, relying on ieee80211_wake_queues()
771 * in a potentionally following zd_usb_enable_tx().
772 */
773 spin_unlock_irqrestore(&tx->lock, flags);
774 }
775
776 /**
777 * zd_usb_enable_tx - enables transmission
778 * @usb: a &struct zd_usb pointer
779 *
780 * This function enables transmission and prepares the &zd_usb_tx data
781 * structure.
782 */
783 void zd_usb_enable_tx(struct zd_usb *usb)
784 {
785 unsigned long flags;
786 struct zd_usb_tx *tx = &usb->tx;
787
788 spin_lock_irqsave(&tx->lock, flags);
789 tx->enabled = 1;
790 tx->submitted_urbs = 0;
791 ieee80211_wake_queues(zd_usb_to_hw(usb));
792 tx->stopped = 0;
793 spin_unlock_irqrestore(&tx->lock, flags);
794 }
795
796 /**
797 * alloc_tx_urb - provides an tx URB
798 * @usb: a &struct zd_usb pointer
799 *
800 * Allocates a new URB. If possible takes the urb from the free list in
801 * usb->tx.
802 */
803 static struct urb *alloc_tx_urb(struct zd_usb *usb)
804 {
805 struct zd_usb_tx *tx = &usb->tx;
806 unsigned long flags;
807 struct list_head *entry;
808 struct urb *urb;
809
810 spin_lock_irqsave(&tx->lock, flags);
811 if (list_empty(&tx->free_urb_list)) {
812 urb = usb_alloc_urb(0, GFP_ATOMIC);
813 goto out;
814 }
815 entry = tx->free_urb_list.next;
816 list_del(entry);
817 urb = list_entry(entry, struct urb, urb_list);
818 out:
819 spin_unlock_irqrestore(&tx->lock, flags);
820 return urb;
821 }
822
823 /**
824 * free_tx_urb - frees a used tx URB
825 * @usb: a &struct zd_usb pointer
826 * @urb: URB to be freed
827 *
828 * Frees the the transmission URB, which means to put it on the free URB
829 * list.
830 */
831 static void free_tx_urb(struct zd_usb *usb, struct urb *urb)
832 {
833 struct zd_usb_tx *tx = &usb->tx;
834 unsigned long flags;
835
836 spin_lock_irqsave(&tx->lock, flags);
837 if (!tx->enabled) {
838 usb_free_urb(urb);
839 goto out;
840 }
841 list_add(&urb->urb_list, &tx->free_urb_list);
842 out:
843 spin_unlock_irqrestore(&tx->lock, flags);
844 }
845
846 static void tx_dec_submitted_urbs(struct zd_usb *usb)
847 {
848 struct zd_usb_tx *tx = &usb->tx;
849 unsigned long flags;
850
851 spin_lock_irqsave(&tx->lock, flags);
852 --tx->submitted_urbs;
853 if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
854 ieee80211_wake_queues(zd_usb_to_hw(usb));
855 tx->stopped = 0;
856 }
857 spin_unlock_irqrestore(&tx->lock, flags);
858 }
859
860 static void tx_inc_submitted_urbs(struct zd_usb *usb)
861 {
862 struct zd_usb_tx *tx = &usb->tx;
863 unsigned long flags;
864
865 spin_lock_irqsave(&tx->lock, flags);
866 ++tx->submitted_urbs;
867 if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
868 ieee80211_stop_queues(zd_usb_to_hw(usb));
869 tx->stopped = 1;
870 }
871 spin_unlock_irqrestore(&tx->lock, flags);
872 }
873
874 /**
875 * tx_urb_complete - completes the execution of an URB
876 * @urb: a URB
877 *
878 * This function is called if the URB has been transferred to a device or an
879 * error has happened.
880 */
881 static void tx_urb_complete(struct urb *urb)
882 {
883 int r;
884 struct sk_buff *skb;
885 struct ieee80211_tx_info *info;
886 struct zd_usb *usb;
887
888 switch (urb->status) {
889 case 0:
890 break;
891 case -ESHUTDOWN:
892 case -EINVAL:
893 case -ENODEV:
894 case -ENOENT:
895 case -ECONNRESET:
896 case -EPIPE:
897 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
898 break;
899 default:
900 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
901 goto resubmit;
902 }
903 free_urb:
904 skb = (struct sk_buff *)urb->context;
905 /*
906 * grab 'usb' pointer before handing off the skb (since
907 * it might be freed by zd_mac_tx_to_dev or mac80211)
908 */
909 info = IEEE80211_SKB_CB(skb);
910 usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb;
911 zd_mac_tx_to_dev(skb, urb->status);
912 free_tx_urb(usb, urb);
913 tx_dec_submitted_urbs(usb);
914 return;
915 resubmit:
916 r = usb_submit_urb(urb, GFP_ATOMIC);
917 if (r) {
918 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
919 goto free_urb;
920 }
921 }
922
923 /**
924 * zd_usb_tx: initiates transfer of a frame of the device
925 *
926 * @usb: the zd1211rw-private USB structure
927 * @skb: a &struct sk_buff pointer
928 *
929 * This function tranmits a frame to the device. It doesn't wait for
930 * completion. The frame must contain the control set and have all the
931 * control set information available.
932 *
933 * The function returns 0 if the transfer has been successfully initiated.
934 */
935 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
936 {
937 int r;
938 struct usb_device *udev = zd_usb_to_usbdev(usb);
939 struct urb *urb;
940
941 urb = alloc_tx_urb(usb);
942 if (!urb) {
943 r = -ENOMEM;
944 goto out;
945 }
946
947 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
948 skb->data, skb->len, tx_urb_complete, skb);
949
950 r = usb_submit_urb(urb, GFP_ATOMIC);
951 if (r)
952 goto error;
953 tx_inc_submitted_urbs(usb);
954 return 0;
955 error:
956 free_tx_urb(usb, urb);
957 out:
958 return r;
959 }
960
961 static inline void init_usb_interrupt(struct zd_usb *usb)
962 {
963 struct zd_usb_interrupt *intr = &usb->intr;
964
965 spin_lock_init(&intr->lock);
966 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
967 init_completion(&intr->read_regs.completion);
968 intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
969 }
970
971 static inline void init_usb_rx(struct zd_usb *usb)
972 {
973 struct zd_usb_rx *rx = &usb->rx;
974 spin_lock_init(&rx->lock);
975 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
976 rx->usb_packet_size = 512;
977 } else {
978 rx->usb_packet_size = 64;
979 }
980 ZD_ASSERT(rx->fragment_length == 0);
981 }
982
983 static inline void init_usb_tx(struct zd_usb *usb)
984 {
985 struct zd_usb_tx *tx = &usb->tx;
986 spin_lock_init(&tx->lock);
987 tx->enabled = 0;
988 tx->stopped = 0;
989 INIT_LIST_HEAD(&tx->free_urb_list);
990 tx->submitted_urbs = 0;
991 }
992
993 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
994 struct usb_interface *intf)
995 {
996 memset(usb, 0, sizeof(*usb));
997 usb->intf = usb_get_intf(intf);
998 usb_set_intfdata(usb->intf, hw);
999 init_usb_interrupt(usb);
1000 init_usb_tx(usb);
1001 init_usb_rx(usb);
1002 }
1003
1004 void zd_usb_clear(struct zd_usb *usb)
1005 {
1006 usb_set_intfdata(usb->intf, NULL);
1007 usb_put_intf(usb->intf);
1008 ZD_MEMCLEAR(usb, sizeof(*usb));
1009 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
1010 }
1011
1012 static const char *speed(enum usb_device_speed speed)
1013 {
1014 switch (speed) {
1015 case USB_SPEED_LOW:
1016 return "low";
1017 case USB_SPEED_FULL:
1018 return "full";
1019 case USB_SPEED_HIGH:
1020 return "high";
1021 default:
1022 return "unknown speed";
1023 }
1024 }
1025
1026 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1027 {
1028 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1029 le16_to_cpu(udev->descriptor.idVendor),
1030 le16_to_cpu(udev->descriptor.idProduct),
1031 get_bcdDevice(udev),
1032 speed(udev->speed));
1033 }
1034
1035 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1036 {
1037 struct usb_device *udev = interface_to_usbdev(usb->intf);
1038 return scnprint_id(udev, buffer, size);
1039 }
1040
1041 #ifdef DEBUG
1042 static void print_id(struct usb_device *udev)
1043 {
1044 char buffer[40];
1045
1046 scnprint_id(udev, buffer, sizeof(buffer));
1047 buffer[sizeof(buffer)-1] = 0;
1048 dev_dbg_f(&udev->dev, "%s\n", buffer);
1049 }
1050 #else
1051 #define print_id(udev) do { } while (0)
1052 #endif
1053
1054 static int eject_installer(struct usb_interface *intf)
1055 {
1056 struct usb_device *udev = interface_to_usbdev(intf);
1057 struct usb_host_interface *iface_desc = &intf->altsetting[0];
1058 struct usb_endpoint_descriptor *endpoint;
1059 unsigned char *cmd;
1060 u8 bulk_out_ep;
1061 int r;
1062
1063 /* Find bulk out endpoint */
1064 endpoint = &iface_desc->endpoint[1].desc;
1065 if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
1066 (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
1067 USB_ENDPOINT_XFER_BULK) {
1068 bulk_out_ep = endpoint->bEndpointAddress;
1069 } else {
1070 dev_err(&udev->dev,
1071 "zd1211rw: Could not find bulk out endpoint\n");
1072 return -ENODEV;
1073 }
1074
1075 cmd = kzalloc(31, GFP_KERNEL);
1076 if (cmd == NULL)
1077 return -ENODEV;
1078
1079 /* USB bulk command block */
1080 cmd[0] = 0x55; /* bulk command signature */
1081 cmd[1] = 0x53; /* bulk command signature */
1082 cmd[2] = 0x42; /* bulk command signature */
1083 cmd[3] = 0x43; /* bulk command signature */
1084 cmd[14] = 6; /* command length */
1085
1086 cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1087 cmd[19] = 0x2; /* eject disc */
1088
1089 dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1090 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1091 cmd, 31, NULL, 2000);
1092 kfree(cmd);
1093 if (r)
1094 return r;
1095
1096 /* At this point, the device disconnects and reconnects with the real
1097 * ID numbers. */
1098
1099 usb_set_intfdata(intf, NULL);
1100 return 0;
1101 }
1102
1103 int zd_usb_init_hw(struct zd_usb *usb)
1104 {
1105 int r;
1106 struct zd_mac *mac = zd_usb_to_mac(usb);
1107
1108 dev_dbg_f(zd_usb_dev(usb), "\n");
1109
1110 r = upload_firmware(usb);
1111 if (r) {
1112 dev_err(zd_usb_dev(usb),
1113 "couldn't load firmware. Error number %d\n", r);
1114 return r;
1115 }
1116
1117 r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1118 if (r) {
1119 dev_dbg_f(zd_usb_dev(usb),
1120 "couldn't reset configuration. Error number %d\n", r);
1121 return r;
1122 }
1123
1124 r = zd_mac_init_hw(mac->hw);
1125 if (r) {
1126 dev_dbg_f(zd_usb_dev(usb),
1127 "couldn't initialize mac. Error number %d\n", r);
1128 return r;
1129 }
1130
1131 usb->initialized = 1;
1132 return 0;
1133 }
1134
1135 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1136 {
1137 int r;
1138 struct usb_device *udev = interface_to_usbdev(intf);
1139 struct zd_usb *usb;
1140 struct ieee80211_hw *hw = NULL;
1141
1142 print_id(udev);
1143
1144 if (id->driver_info & DEVICE_INSTALLER)
1145 return eject_installer(intf);
1146
1147 switch (udev->speed) {
1148 case USB_SPEED_LOW:
1149 case USB_SPEED_FULL:
1150 case USB_SPEED_HIGH:
1151 break;
1152 default:
1153 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1154 r = -ENODEV;
1155 goto error;
1156 }
1157
1158 r = usb_reset_device(udev);
1159 if (r) {
1160 dev_err(&intf->dev,
1161 "couldn't reset usb device. Error number %d\n", r);
1162 goto error;
1163 }
1164
1165 hw = zd_mac_alloc_hw(intf);
1166 if (hw == NULL) {
1167 r = -ENOMEM;
1168 goto error;
1169 }
1170
1171 usb = &zd_hw_mac(hw)->chip.usb;
1172 usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1173
1174 r = zd_mac_preinit_hw(hw);
1175 if (r) {
1176 dev_dbg_f(&intf->dev,
1177 "couldn't initialize mac. Error number %d\n", r);
1178 goto error;
1179 }
1180
1181 r = ieee80211_register_hw(hw);
1182 if (r) {
1183 dev_dbg_f(&intf->dev,
1184 "couldn't register device. Error number %d\n", r);
1185 goto error;
1186 }
1187
1188 dev_dbg_f(&intf->dev, "successful\n");
1189 dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
1190 return 0;
1191 error:
1192 usb_reset_device(interface_to_usbdev(intf));
1193 if (hw) {
1194 zd_mac_clear(zd_hw_mac(hw));
1195 ieee80211_free_hw(hw);
1196 }
1197 return r;
1198 }
1199
1200 static void disconnect(struct usb_interface *intf)
1201 {
1202 struct ieee80211_hw *hw = zd_intf_to_hw(intf);
1203 struct zd_mac *mac;
1204 struct zd_usb *usb;
1205
1206 /* Either something really bad happened, or we're just dealing with
1207 * a DEVICE_INSTALLER. */
1208 if (hw == NULL)
1209 return;
1210
1211 mac = zd_hw_mac(hw);
1212 usb = &mac->chip.usb;
1213
1214 dev_dbg_f(zd_usb_dev(usb), "\n");
1215
1216 ieee80211_unregister_hw(hw);
1217
1218 /* Just in case something has gone wrong! */
1219 zd_usb_disable_rx(usb);
1220 zd_usb_disable_int(usb);
1221
1222 /* If the disconnect has been caused by a removal of the
1223 * driver module, the reset allows reloading of the driver. If the
1224 * reset will not be executed here, the upload of the firmware in the
1225 * probe function caused by the reloading of the driver will fail.
1226 */
1227 usb_reset_device(interface_to_usbdev(intf));
1228
1229 zd_mac_clear(mac);
1230 ieee80211_free_hw(hw);
1231 dev_dbg(&intf->dev, "disconnected\n");
1232 }
1233
1234 static struct usb_driver driver = {
1235 .name = KBUILD_MODNAME,
1236 .id_table = usb_ids,
1237 .probe = probe,
1238 .disconnect = disconnect,
1239 };
1240
1241 struct workqueue_struct *zd_workqueue;
1242
1243 static int __init usb_init(void)
1244 {
1245 int r;
1246
1247 pr_debug("%s usb_init()\n", driver.name);
1248
1249 zd_workqueue = create_singlethread_workqueue(driver.name);
1250 if (zd_workqueue == NULL) {
1251 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1252 return -ENOMEM;
1253 }
1254
1255 r = usb_register(&driver);
1256 if (r) {
1257 destroy_workqueue(zd_workqueue);
1258 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1259 driver.name, r);
1260 return r;
1261 }
1262
1263 pr_debug("%s initialized\n", driver.name);
1264 return 0;
1265 }
1266
1267 static void __exit usb_exit(void)
1268 {
1269 pr_debug("%s usb_exit()\n", driver.name);
1270 usb_deregister(&driver);
1271 destroy_workqueue(zd_workqueue);
1272 }
1273
1274 module_init(usb_init);
1275 module_exit(usb_exit);
1276
1277 static int usb_int_regs_length(unsigned int count)
1278 {
1279 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1280 }
1281
1282 static void prepare_read_regs_int(struct zd_usb *usb)
1283 {
1284 struct zd_usb_interrupt *intr = &usb->intr;
1285
1286 spin_lock_irq(&intr->lock);
1287 intr->read_regs_enabled = 1;
1288 INIT_COMPLETION(intr->read_regs.completion);
1289 spin_unlock_irq(&intr->lock);
1290 }
1291
1292 static void disable_read_regs_int(struct zd_usb *usb)
1293 {
1294 struct zd_usb_interrupt *intr = &usb->intr;
1295
1296 spin_lock_irq(&intr->lock);
1297 intr->read_regs_enabled = 0;
1298 spin_unlock_irq(&intr->lock);
1299 }
1300
1301 static int get_results(struct zd_usb *usb, u16 *values,
1302 struct usb_req_read_regs *req, unsigned int count)
1303 {
1304 int r;
1305 int i;
1306 struct zd_usb_interrupt *intr = &usb->intr;
1307 struct read_regs_int *rr = &intr->read_regs;
1308 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1309
1310 spin_lock_irq(&intr->lock);
1311
1312 r = -EIO;
1313 /* The created block size seems to be larger than expected.
1314 * However results appear to be correct.
1315 */
1316 if (rr->length < usb_int_regs_length(count)) {
1317 dev_dbg_f(zd_usb_dev(usb),
1318 "error: actual length %d less than expected %d\n",
1319 rr->length, usb_int_regs_length(count));
1320 goto error_unlock;
1321 }
1322 if (rr->length > sizeof(rr->buffer)) {
1323 dev_dbg_f(zd_usb_dev(usb),
1324 "error: actual length %d exceeds buffer size %zu\n",
1325 rr->length, sizeof(rr->buffer));
1326 goto error_unlock;
1327 }
1328
1329 for (i = 0; i < count; i++) {
1330 struct reg_data *rd = &regs->regs[i];
1331 if (rd->addr != req->addr[i]) {
1332 dev_dbg_f(zd_usb_dev(usb),
1333 "rd[%d] addr %#06hx expected %#06hx\n", i,
1334 le16_to_cpu(rd->addr),
1335 le16_to_cpu(req->addr[i]));
1336 goto error_unlock;
1337 }
1338 values[i] = le16_to_cpu(rd->value);
1339 }
1340
1341 r = 0;
1342 error_unlock:
1343 spin_unlock_irq(&intr->lock);
1344 return r;
1345 }
1346
1347 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1348 const zd_addr_t *addresses, unsigned int count)
1349 {
1350 int r;
1351 int i, req_len, actual_req_len;
1352 struct usb_device *udev;
1353 struct usb_req_read_regs *req = NULL;
1354 unsigned long timeout;
1355
1356 if (count < 1) {
1357 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1358 return -EINVAL;
1359 }
1360 if (count > USB_MAX_IOREAD16_COUNT) {
1361 dev_dbg_f(zd_usb_dev(usb),
1362 "error: count %u exceeds possible max %u\n",
1363 count, USB_MAX_IOREAD16_COUNT);
1364 return -EINVAL;
1365 }
1366 if (in_atomic()) {
1367 dev_dbg_f(zd_usb_dev(usb),
1368 "error: io in atomic context not supported\n");
1369 return -EWOULDBLOCK;
1370 }
1371 if (!usb_int_enabled(usb)) {
1372 dev_dbg_f(zd_usb_dev(usb),
1373 "error: usb interrupt not enabled\n");
1374 return -EWOULDBLOCK;
1375 }
1376
1377 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1378 req = kmalloc(req_len, GFP_KERNEL);
1379 if (!req)
1380 return -ENOMEM;
1381 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1382 for (i = 0; i < count; i++)
1383 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1384
1385 udev = zd_usb_to_usbdev(usb);
1386 prepare_read_regs_int(usb);
1387 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1388 req, req_len, &actual_req_len, 1000 /* ms */);
1389 if (r) {
1390 dev_dbg_f(zd_usb_dev(usb),
1391 "error in usb_bulk_msg(). Error number %d\n", r);
1392 goto error;
1393 }
1394 if (req_len != actual_req_len) {
1395 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1396 " req_len %d != actual_req_len %d\n",
1397 req_len, actual_req_len);
1398 r = -EIO;
1399 goto error;
1400 }
1401
1402 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1403 msecs_to_jiffies(1000));
1404 if (!timeout) {
1405 disable_read_regs_int(usb);
1406 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1407 r = -ETIMEDOUT;
1408 goto error;
1409 }
1410
1411 r = get_results(usb, values, req, count);
1412 error:
1413 kfree(req);
1414 return r;
1415 }
1416
1417 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1418 unsigned int count)
1419 {
1420 int r;
1421 struct usb_device *udev;
1422 struct usb_req_write_regs *req = NULL;
1423 int i, req_len, actual_req_len;
1424
1425 if (count == 0)
1426 return 0;
1427 if (count > USB_MAX_IOWRITE16_COUNT) {
1428 dev_dbg_f(zd_usb_dev(usb),
1429 "error: count %u exceeds possible max %u\n",
1430 count, USB_MAX_IOWRITE16_COUNT);
1431 return -EINVAL;
1432 }
1433 if (in_atomic()) {
1434 dev_dbg_f(zd_usb_dev(usb),
1435 "error: io in atomic context not supported\n");
1436 return -EWOULDBLOCK;
1437 }
1438
1439 req_len = sizeof(struct usb_req_write_regs) +
1440 count * sizeof(struct reg_data);
1441 req = kmalloc(req_len, GFP_KERNEL);
1442 if (!req)
1443 return -ENOMEM;
1444
1445 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1446 for (i = 0; i < count; i++) {
1447 struct reg_data *rw = &req->reg_writes[i];
1448 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1449 rw->value = cpu_to_le16(ioreqs[i].value);
1450 }
1451
1452 udev = zd_usb_to_usbdev(usb);
1453 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1454 req, req_len, &actual_req_len, 1000 /* ms */);
1455 if (r) {
1456 dev_dbg_f(zd_usb_dev(usb),
1457 "error in usb_bulk_msg(). Error number %d\n", r);
1458 goto error;
1459 }
1460 if (req_len != actual_req_len) {
1461 dev_dbg_f(zd_usb_dev(usb),
1462 "error in usb_bulk_msg()"
1463 " req_len %d != actual_req_len %d\n",
1464 req_len, actual_req_len);
1465 r = -EIO;
1466 goto error;
1467 }
1468
1469 /* FALL-THROUGH with r == 0 */
1470 error:
1471 kfree(req);
1472 return r;
1473 }
1474
1475 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1476 {
1477 int r;
1478 struct usb_device *udev;
1479 struct usb_req_rfwrite *req = NULL;
1480 int i, req_len, actual_req_len;
1481 u16 bit_value_template;
1482
1483 if (in_atomic()) {
1484 dev_dbg_f(zd_usb_dev(usb),
1485 "error: io in atomic context not supported\n");
1486 return -EWOULDBLOCK;
1487 }
1488 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1489 dev_dbg_f(zd_usb_dev(usb),
1490 "error: bits %d are smaller than"
1491 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1492 bits, USB_MIN_RFWRITE_BIT_COUNT);
1493 return -EINVAL;
1494 }
1495 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1496 dev_dbg_f(zd_usb_dev(usb),
1497 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1498 bits, USB_MAX_RFWRITE_BIT_COUNT);
1499 return -EINVAL;
1500 }
1501 #ifdef DEBUG
1502 if (value & (~0UL << bits)) {
1503 dev_dbg_f(zd_usb_dev(usb),
1504 "error: value %#09x has bits >= %d set\n",
1505 value, bits);
1506 return -EINVAL;
1507 }
1508 #endif /* DEBUG */
1509
1510 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1511
1512 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1513 if (r) {
1514 dev_dbg_f(zd_usb_dev(usb),
1515 "error %d: Couldn't read CR203\n", r);
1516 goto out;
1517 }
1518 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1519
1520 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1521 req = kmalloc(req_len, GFP_KERNEL);
1522 if (!req)
1523 return -ENOMEM;
1524
1525 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1526 /* 1: 3683a, but not used in ZYDAS driver */
1527 req->value = cpu_to_le16(2);
1528 req->bits = cpu_to_le16(bits);
1529
1530 for (i = 0; i < bits; i++) {
1531 u16 bv = bit_value_template;
1532 if (value & (1 << (bits-1-i)))
1533 bv |= RF_DATA;
1534 req->bit_values[i] = cpu_to_le16(bv);
1535 }
1536
1537 udev = zd_usb_to_usbdev(usb);
1538 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1539 req, req_len, &actual_req_len, 1000 /* ms */);
1540 if (r) {
1541 dev_dbg_f(zd_usb_dev(usb),
1542 "error in usb_bulk_msg(). Error number %d\n", r);
1543 goto out;
1544 }
1545 if (req_len != actual_req_len) {
1546 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1547 " req_len %d != actual_req_len %d\n",
1548 req_len, actual_req_len);
1549 r = -EIO;
1550 goto out;
1551 }
1552
1553 /* FALL-THROUGH with r == 0 */
1554 out:
1555 kfree(req);
1556 return r;
1557 }
Linux kernel - Deliverables
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