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zd1211rw: correct use of usb_bulk_msg on interrupt endpoints
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / wireless / zd1211rw / zd_usb.c
blob7346512158e80aef729d281905ee0045b6e5bef8
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/slab.h>
28 #include <linux/skbuff.h>
29 #include <linux/usb.h>
30 #include <linux/workqueue.h>
31 #include <net/mac80211.h>
32 #include <asm/unaligned.h>
33
34 #include "zd_def.h"
35 #include "zd_mac.h"
36 #include "zd_usb.h"
37
38 static struct usb_device_id usb_ids[] = {
39 /* ZD1211 */
40 { USB_DEVICE(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 },
41 { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
42 { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
43 { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
44 { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
45 { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
46 { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
47 { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
48 { USB_DEVICE(0x0ace, 0xa211), .driver_info = DEVICE_ZD1211 },
49 { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
50 { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
51 { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
52 { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
53 { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
54 { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
55 { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 },
56 { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
57 { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
58 { USB_DEVICE(0x14ea, 0xab10), .driver_info = DEVICE_ZD1211 },
59 { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
60 { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
61 { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
62 { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
63 { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
64 { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
65 /* ZD1211B */
66 { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
67 { USB_DEVICE(0x0409, 0x0248), .driver_info = DEVICE_ZD1211B },
68 { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
69 { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
70 { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
71 { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
72 { USB_DEVICE(0x054c, 0x0257), .driver_info = DEVICE_ZD1211B },
73 { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
74 { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
75 { USB_DEVICE(0x0586, 0x3410), .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(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
79 { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211B },
80 { USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B },
81 { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
82 { USB_DEVICE(0x083a, 0xe501), .driver_info = DEVICE_ZD1211B },
83 { USB_DEVICE(0x083a, 0xe503), .driver_info = DEVICE_ZD1211B },
84 { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
85 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
86 { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B },
87 { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
88 { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
89 { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
90 { USB_DEVICE(0x0df6, 0x0036), .driver_info = DEVICE_ZD1211B },
91 { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
92 { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
93 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
94 { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
95 { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
96 { USB_DEVICE(0x2019, 0xed01), .driver_info = DEVICE_ZD1211B },
97 /* "Driverless" devices that need ejecting */
98 { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
99 { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
100 {}
101 };
102
103 MODULE_LICENSE("GPL");
104 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
105 MODULE_AUTHOR("Ulrich Kunitz");
106 MODULE_AUTHOR("Daniel Drake");
107 MODULE_VERSION("1.0");
108 MODULE_DEVICE_TABLE(usb, usb_ids);
109
110 #define FW_ZD1211_PREFIX "zd1211/zd1211_"
111 #define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
112
113 /* USB device initialization */
114 static void int_urb_complete(struct urb *urb);
115
116 static int request_fw_file(
117 const struct firmware **fw, const char *name, struct device *device)
118 {
119 int r;
120
121 dev_dbg_f(device, "fw name %s\n", name);
122
123 r = request_firmware(fw, name, device);
124 if (r)
125 dev_err(device,
126 "Could not load firmware file %s. Error number %d\n",
127 name, r);
128 return r;
129 }
130
131 static inline u16 get_bcdDevice(const struct usb_device *udev)
132 {
133 return le16_to_cpu(udev->descriptor.bcdDevice);
134 }
135
136 enum upload_code_flags {
137 REBOOT = 1,
138 };
139
140 /* Ensures that MAX_TRANSFER_SIZE is even. */
141 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
142
143 static int upload_code(struct usb_device *udev,
144 const u8 *data, size_t size, u16 code_offset, int flags)
145 {
146 u8 *p;
147 int r;
148
149 /* USB request blocks need "kmalloced" buffers.
150 */
151 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
152 if (!p) {
153 dev_err(&udev->dev, "out of memory\n");
154 r = -ENOMEM;
155 goto error;
156 }
157
158 size &= ~1;
159 while (size > 0) {
160 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
161 size : MAX_TRANSFER_SIZE;
162
163 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
164
165 memcpy(p, data, transfer_size);
166 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
167 USB_REQ_FIRMWARE_DOWNLOAD,
168 USB_DIR_OUT | USB_TYPE_VENDOR,
169 code_offset, 0, p, transfer_size, 1000 /* ms */);
170 if (r < 0) {
171 dev_err(&udev->dev,
172 "USB control request for firmware upload"
173 " failed. Error number %d\n", r);
174 goto error;
175 }
176 transfer_size = r & ~1;
177
178 size -= transfer_size;
179 data += transfer_size;
180 code_offset += transfer_size/sizeof(u16);
181 }
182
183 if (flags & REBOOT) {
184 u8 ret;
185
186 /* Use "DMA-aware" buffer. */
187 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
188 USB_REQ_FIRMWARE_CONFIRM,
189 USB_DIR_IN | USB_TYPE_VENDOR,
190 0, 0, p, sizeof(ret), 5000 /* ms */);
191 if (r != sizeof(ret)) {
192 dev_err(&udev->dev,
193 "control request firmeware confirmation failed."
194 " Return value %d\n", r);
195 if (r >= 0)
196 r = -ENODEV;
197 goto error;
198 }
199 ret = p[0];
200 if (ret & 0x80) {
201 dev_err(&udev->dev,
202 "Internal error while downloading."
203 " Firmware confirm return value %#04x\n",
204 (unsigned int)ret);
205 r = -ENODEV;
206 goto error;
207 }
208 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
209 (unsigned int)ret);
210 }
211
212 r = 0;
213 error:
214 kfree(p);
215 return r;
216 }
217
218 static u16 get_word(const void *data, u16 offset)
219 {
220 const __le16 *p = data;
221 return le16_to_cpu(p[offset]);
222 }
223
224 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
225 const char* postfix)
226 {
227 scnprintf(buffer, size, "%s%s",
228 usb->is_zd1211b ?
229 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
230 postfix);
231 return buffer;
232 }
233
234 static int handle_version_mismatch(struct zd_usb *usb,
235 const struct firmware *ub_fw)
236 {
237 struct usb_device *udev = zd_usb_to_usbdev(usb);
238 const struct firmware *ur_fw = NULL;
239 int offset;
240 int r = 0;
241 char fw_name[128];
242
243 r = request_fw_file(&ur_fw,
244 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
245 &udev->dev);
246 if (r)
247 goto error;
248
249 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
250 if (r)
251 goto error;
252
253 offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
254 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
255 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
256
257 /* At this point, the vendor driver downloads the whole firmware
258 * image, hacks around with version IDs, and uploads it again,
259 * completely overwriting the boot code. We do not do this here as
260 * it is not required on any tested devices, and it is suspected to
261 * cause problems. */
262 error:
263 release_firmware(ur_fw);
264 return r;
265 }
266
267 static int upload_firmware(struct zd_usb *usb)
268 {
269 int r;
270 u16 fw_bcdDevice;
271 u16 bcdDevice;
272 struct usb_device *udev = zd_usb_to_usbdev(usb);
273 const struct firmware *ub_fw = NULL;
274 const struct firmware *uph_fw = NULL;
275 char fw_name[128];
276
277 bcdDevice = get_bcdDevice(udev);
278
279 r = request_fw_file(&ub_fw,
280 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
281 &udev->dev);
282 if (r)
283 goto error;
284
285 fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
286
287 if (fw_bcdDevice != bcdDevice) {
288 dev_info(&udev->dev,
289 "firmware version %#06x and device bootcode version "
290 "%#06x differ\n", fw_bcdDevice, bcdDevice);
291 if (bcdDevice <= 0x4313)
292 dev_warn(&udev->dev, "device has old bootcode, please "
293 "report success or failure\n");
294
295 r = handle_version_mismatch(usb, ub_fw);
296 if (r)
297 goto error;
298 } else {
299 dev_dbg_f(&udev->dev,
300 "firmware device id %#06x is equal to the "
301 "actual device id\n", fw_bcdDevice);
302 }
303
304
305 r = request_fw_file(&uph_fw,
306 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
307 &udev->dev);
308 if (r)
309 goto error;
310
311 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
312 if (r) {
313 dev_err(&udev->dev,
314 "Could not upload firmware code uph. Error number %d\n",
315 r);
316 }
317
318 /* FALL-THROUGH */
319 error:
320 release_firmware(ub_fw);
321 release_firmware(uph_fw);
322 return r;
323 }
324
325 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ur");
326 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ur");
327 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ub");
328 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ub");
329 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "uphr");
330 MODULE_FIRMWARE(FW_ZD1211_PREFIX "uphr");
331
332 /* Read data from device address space using "firmware interface" which does
333 * not require firmware to be loaded. */
334 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
335 {
336 int r;
337 struct usb_device *udev = zd_usb_to_usbdev(usb);
338 u8 *buf;
339
340 /* Use "DMA-aware" buffer. */
341 buf = kmalloc(len, GFP_KERNEL);
342 if (!buf)
343 return -ENOMEM;
344 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
345 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
346 buf, len, 5000);
347 if (r < 0) {
348 dev_err(&udev->dev,
349 "read over firmware interface failed: %d\n", r);
350 goto exit;
351 } else if (r != len) {
352 dev_err(&udev->dev,
353 "incomplete read over firmware interface: %d/%d\n",
354 r, len);
355 r = -EIO;
356 goto exit;
357 }
358 r = 0;
359 memcpy(data, buf, len);
360 exit:
361 kfree(buf);
362 return r;
363 }
364
365 #define urb_dev(urb) (&(urb)->dev->dev)
366
367 static inline void handle_regs_int(struct urb *urb)
368 {
369 struct zd_usb *usb = urb->context;
370 struct zd_usb_interrupt *intr = &usb->intr;
371 int len;
372 u16 int_num;
373
374 ZD_ASSERT(in_interrupt());
375 spin_lock(&intr->lock);
376
377 int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
378 if (int_num == CR_INTERRUPT) {
379 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
380 spin_lock(&mac->lock);
381 memcpy(&mac->intr_buffer, urb->transfer_buffer,
382 USB_MAX_EP_INT_BUFFER);
383 spin_unlock(&mac->lock);
384 schedule_work(&mac->process_intr);
385 } else if (intr->read_regs_enabled) {
386 intr->read_regs.length = len = urb->actual_length;
387
388 if (len > sizeof(intr->read_regs.buffer))
389 len = sizeof(intr->read_regs.buffer);
390 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
391 intr->read_regs_enabled = 0;
392 complete(&intr->read_regs.completion);
393 goto out;
394 }
395
396 out:
397 spin_unlock(&intr->lock);
398 }
399
400 static void int_urb_complete(struct urb *urb)
401 {
402 int r;
403 struct usb_int_header *hdr;
404
405 switch (urb->status) {
406 case 0:
407 break;
408 case -ESHUTDOWN:
409 case -EINVAL:
410 case -ENODEV:
411 case -ENOENT:
412 case -ECONNRESET:
413 case -EPIPE:
414 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
415 return;
416 default:
417 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
418 goto resubmit;
419 }
420
421 if (urb->actual_length < sizeof(hdr)) {
422 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
423 goto resubmit;
424 }
425
426 hdr = urb->transfer_buffer;
427 if (hdr->type != USB_INT_TYPE) {
428 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
429 goto resubmit;
430 }
431
432 switch (hdr->id) {
433 case USB_INT_ID_REGS:
434 handle_regs_int(urb);
435 break;
436 case USB_INT_ID_RETRY_FAILED:
437 zd_mac_tx_failed(urb);
438 break;
439 default:
440 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
441 (unsigned int)hdr->id);
442 goto resubmit;
443 }
444
445 resubmit:
446 r = usb_submit_urb(urb, GFP_ATOMIC);
447 if (r) {
448 dev_dbg_f(urb_dev(urb), "error: resubmit urb %p err code %d\n",
449 urb, r);
450 /* TODO: add worker to reset intr->urb */
451 }
452 return;
453 }
454
455 static inline int int_urb_interval(struct usb_device *udev)
456 {
457 switch (udev->speed) {
458 case USB_SPEED_HIGH:
459 return 4;
460 case USB_SPEED_LOW:
461 return 10;
462 case USB_SPEED_FULL:
463 default:
464 return 1;
465 }
466 }
467
468 static inline int usb_int_enabled(struct zd_usb *usb)
469 {
470 unsigned long flags;
471 struct zd_usb_interrupt *intr = &usb->intr;
472 struct urb *urb;
473
474 spin_lock_irqsave(&intr->lock, flags);
475 urb = intr->urb;
476 spin_unlock_irqrestore(&intr->lock, flags);
477 return urb != NULL;
478 }
479
480 int zd_usb_enable_int(struct zd_usb *usb)
481 {
482 int r;
483 struct usb_device *udev = zd_usb_to_usbdev(usb);
484 struct zd_usb_interrupt *intr = &usb->intr;
485 struct urb *urb;
486
487 dev_dbg_f(zd_usb_dev(usb), "\n");
488
489 urb = usb_alloc_urb(0, GFP_KERNEL);
490 if (!urb) {
491 r = -ENOMEM;
492 goto out;
493 }
494
495 ZD_ASSERT(!irqs_disabled());
496 spin_lock_irq(&intr->lock);
497 if (intr->urb) {
498 spin_unlock_irq(&intr->lock);
499 r = 0;
500 goto error_free_urb;
501 }
502 intr->urb = urb;
503 spin_unlock_irq(&intr->lock);
504
505 r = -ENOMEM;
506 intr->buffer = usb_alloc_coherent(udev, USB_MAX_EP_INT_BUFFER,
507 GFP_KERNEL, &intr->buffer_dma);
508 if (!intr->buffer) {
509 dev_dbg_f(zd_usb_dev(usb),
510 "couldn't allocate transfer_buffer\n");
511 goto error_set_urb_null;
512 }
513
514 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
515 intr->buffer, USB_MAX_EP_INT_BUFFER,
516 int_urb_complete, usb,
517 intr->interval);
518 urb->transfer_dma = intr->buffer_dma;
519 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
520
521 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
522 r = usb_submit_urb(urb, GFP_KERNEL);
523 if (r) {
524 dev_dbg_f(zd_usb_dev(usb),
525 "Couldn't submit urb. Error number %d\n", r);
526 goto error;
527 }
528
529 return 0;
530 error:
531 usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER,
532 intr->buffer, intr->buffer_dma);
533 error_set_urb_null:
534 spin_lock_irq(&intr->lock);
535 intr->urb = NULL;
536 spin_unlock_irq(&intr->lock);
537 error_free_urb:
538 usb_free_urb(urb);
539 out:
540 return r;
541 }
542
543 void zd_usb_disable_int(struct zd_usb *usb)
544 {
545 unsigned long flags;
546 struct usb_device *udev = zd_usb_to_usbdev(usb);
547 struct zd_usb_interrupt *intr = &usb->intr;
548 struct urb *urb;
549 void *buffer;
550 dma_addr_t buffer_dma;
551
552 spin_lock_irqsave(&intr->lock, flags);
553 urb = intr->urb;
554 if (!urb) {
555 spin_unlock_irqrestore(&intr->lock, flags);
556 return;
557 }
558 intr->urb = NULL;
559 buffer = intr->buffer;
560 buffer_dma = intr->buffer_dma;
561 intr->buffer = 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 if (buffer)
569 usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER,
570 buffer, buffer_dma);
571 }
572
573 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
574 unsigned int length)
575 {
576 int i;
577 const struct rx_length_info *length_info;
578
579 if (length < sizeof(struct rx_length_info)) {
580 /* It's not a complete packet anyhow. */
581 printk("%s: invalid, small RX packet : %d\n",
582 __func__, length);
583 return;
584 }
585 length_info = (struct rx_length_info *)
586 (buffer + length - sizeof(struct rx_length_info));
587
588 /* It might be that three frames are merged into a single URB
589 * transaction. We have to check for the length info tag.
590 *
591 * While testing we discovered that length_info might be unaligned,
592 * because if USB transactions are merged, the last packet will not
593 * be padded. Unaligned access might also happen if the length_info
594 * structure is not present.
595 */
596 if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
597 {
598 unsigned int l, k, n;
599 for (i = 0, l = 0;; i++) {
600 k = get_unaligned_le16(&length_info->length[i]);
601 if (k == 0)
602 return;
603 n = l+k;
604 if (n > length)
605 return;
606 zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
607 if (i >= 2)
608 return;
609 l = (n+3) & ~3;
610 }
611 } else {
612 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
613 }
614 }
615
616 static void rx_urb_complete(struct urb *urb)
617 {
618 int r;
619 struct zd_usb *usb;
620 struct zd_usb_rx *rx;
621 const u8 *buffer;
622 unsigned int length;
623
624 switch (urb->status) {
625 case 0:
626 break;
627 case -ESHUTDOWN:
628 case -EINVAL:
629 case -ENODEV:
630 case -ENOENT:
631 case -ECONNRESET:
632 case -EPIPE:
633 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
634 return;
635 default:
636 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
637 goto resubmit;
638 }
639
640 buffer = urb->transfer_buffer;
641 length = urb->actual_length;
642 usb = urb->context;
643 rx = &usb->rx;
644
645 zd_usb_reset_rx_idle_timer(usb);
646
647 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
648 /* If there is an old first fragment, we don't care. */
649 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
650 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
651 spin_lock(&rx->lock);
652 memcpy(rx->fragment, buffer, length);
653 rx->fragment_length = length;
654 spin_unlock(&rx->lock);
655 goto resubmit;
656 }
657
658 spin_lock(&rx->lock);
659 if (rx->fragment_length > 0) {
660 /* We are on a second fragment, we believe */
661 ZD_ASSERT(length + rx->fragment_length <=
662 ARRAY_SIZE(rx->fragment));
663 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
664 memcpy(rx->fragment+rx->fragment_length, buffer, length);
665 handle_rx_packet(usb, rx->fragment,
666 rx->fragment_length + length);
667 rx->fragment_length = 0;
668 spin_unlock(&rx->lock);
669 } else {
670 spin_unlock(&rx->lock);
671 handle_rx_packet(usb, buffer, length);
672 }
673
674 resubmit:
675 r = usb_submit_urb(urb, GFP_ATOMIC);
676 if (r)
677 dev_dbg_f(urb_dev(urb), "urb %p resubmit error %d\n", urb, r);
678 }
679
680 static struct urb *alloc_rx_urb(struct zd_usb *usb)
681 {
682 struct usb_device *udev = zd_usb_to_usbdev(usb);
683 struct urb *urb;
684 void *buffer;
685
686 urb = usb_alloc_urb(0, GFP_KERNEL);
687 if (!urb)
688 return NULL;
689 buffer = usb_alloc_coherent(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
690 &urb->transfer_dma);
691 if (!buffer) {
692 usb_free_urb(urb);
693 return NULL;
694 }
695
696 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
697 buffer, USB_MAX_RX_SIZE,
698 rx_urb_complete, usb);
699 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
700
701 return urb;
702 }
703
704 static void free_rx_urb(struct urb *urb)
705 {
706 if (!urb)
707 return;
708 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
709 urb->transfer_buffer, urb->transfer_dma);
710 usb_free_urb(urb);
711 }
712
713 static int __zd_usb_enable_rx(struct zd_usb *usb)
714 {
715 int i, r;
716 struct zd_usb_rx *rx = &usb->rx;
717 struct urb **urbs;
718
719 dev_dbg_f(zd_usb_dev(usb), "\n");
720
721 r = -ENOMEM;
722 urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
723 if (!urbs)
724 goto error;
725 for (i = 0; i < RX_URBS_COUNT; i++) {
726 urbs[i] = alloc_rx_urb(usb);
727 if (!urbs[i])
728 goto error;
729 }
730
731 ZD_ASSERT(!irqs_disabled());
732 spin_lock_irq(&rx->lock);
733 if (rx->urbs) {
734 spin_unlock_irq(&rx->lock);
735 r = 0;
736 goto error;
737 }
738 rx->urbs = urbs;
739 rx->urbs_count = RX_URBS_COUNT;
740 spin_unlock_irq(&rx->lock);
741
742 for (i = 0; i < RX_URBS_COUNT; i++) {
743 r = usb_submit_urb(urbs[i], GFP_KERNEL);
744 if (r)
745 goto error_submit;
746 }
747
748 return 0;
749 error_submit:
750 for (i = 0; i < RX_URBS_COUNT; i++) {
751 usb_kill_urb(urbs[i]);
752 }
753 spin_lock_irq(&rx->lock);
754 rx->urbs = NULL;
755 rx->urbs_count = 0;
756 spin_unlock_irq(&rx->lock);
757 error:
758 if (urbs) {
759 for (i = 0; i < RX_URBS_COUNT; i++)
760 free_rx_urb(urbs[i]);
761 }
762 return r;
763 }
764
765 int zd_usb_enable_rx(struct zd_usb *usb)
766 {
767 int r;
768 struct zd_usb_rx *rx = &usb->rx;
769
770 mutex_lock(&rx->setup_mutex);
771 r = __zd_usb_enable_rx(usb);
772 mutex_unlock(&rx->setup_mutex);
773
774 zd_usb_reset_rx_idle_timer(usb);
775
776 return r;
777 }
778
779 static void __zd_usb_disable_rx(struct zd_usb *usb)
780 {
781 int i;
782 unsigned long flags;
783 struct urb **urbs;
784 unsigned int count;
785 struct zd_usb_rx *rx = &usb->rx;
786
787 spin_lock_irqsave(&rx->lock, flags);
788 urbs = rx->urbs;
789 count = rx->urbs_count;
790 spin_unlock_irqrestore(&rx->lock, flags);
791 if (!urbs)
792 return;
793
794 for (i = 0; i < count; i++) {
795 usb_kill_urb(urbs[i]);
796 free_rx_urb(urbs[i]);
797 }
798 kfree(urbs);
799
800 spin_lock_irqsave(&rx->lock, flags);
801 rx->urbs = NULL;
802 rx->urbs_count = 0;
803 spin_unlock_irqrestore(&rx->lock, flags);
804 }
805
806 void zd_usb_disable_rx(struct zd_usb *usb)
807 {
808 struct zd_usb_rx *rx = &usb->rx;
809
810 mutex_lock(&rx->setup_mutex);
811 __zd_usb_disable_rx(usb);
812 mutex_unlock(&rx->setup_mutex);
813
814 cancel_delayed_work_sync(&rx->idle_work);
815 }
816
817 static void zd_usb_reset_rx(struct zd_usb *usb)
818 {
819 bool do_reset;
820 struct zd_usb_rx *rx = &usb->rx;
821 unsigned long flags;
822
823 mutex_lock(&rx->setup_mutex);
824
825 spin_lock_irqsave(&rx->lock, flags);
826 do_reset = rx->urbs != NULL;
827 spin_unlock_irqrestore(&rx->lock, flags);
828
829 if (do_reset) {
830 __zd_usb_disable_rx(usb);
831 __zd_usb_enable_rx(usb);
832 }
833
834 mutex_unlock(&rx->setup_mutex);
835
836 if (do_reset)
837 zd_usb_reset_rx_idle_timer(usb);
838 }
839
840 /**
841 * zd_usb_disable_tx - disable transmission
842 * @usb: the zd1211rw-private USB structure
843 *
844 * Frees all URBs in the free list and marks the transmission as disabled.
845 */
846 void zd_usb_disable_tx(struct zd_usb *usb)
847 {
848 struct zd_usb_tx *tx = &usb->tx;
849 unsigned long flags;
850
851 atomic_set(&tx->enabled, 0);
852
853 /* kill all submitted tx-urbs */
854 usb_kill_anchored_urbs(&tx->submitted);
855
856 spin_lock_irqsave(&tx->lock, flags);
857 WARN_ON(!skb_queue_empty(&tx->submitted_skbs));
858 WARN_ON(tx->submitted_urbs != 0);
859 tx->submitted_urbs = 0;
860 spin_unlock_irqrestore(&tx->lock, flags);
861
862 /* The stopped state is ignored, relying on ieee80211_wake_queues()
863 * in a potentionally following zd_usb_enable_tx().
864 */
865 }
866
867 /**
868 * zd_usb_enable_tx - enables transmission
869 * @usb: a &struct zd_usb pointer
870 *
871 * This function enables transmission and prepares the &zd_usb_tx data
872 * structure.
873 */
874 void zd_usb_enable_tx(struct zd_usb *usb)
875 {
876 unsigned long flags;
877 struct zd_usb_tx *tx = &usb->tx;
878
879 spin_lock_irqsave(&tx->lock, flags);
880 atomic_set(&tx->enabled, 1);
881 tx->submitted_urbs = 0;
882 ieee80211_wake_queues(zd_usb_to_hw(usb));
883 tx->stopped = 0;
884 spin_unlock_irqrestore(&tx->lock, flags);
885 }
886
887 static void tx_dec_submitted_urbs(struct zd_usb *usb)
888 {
889 struct zd_usb_tx *tx = &usb->tx;
890 unsigned long flags;
891
892 spin_lock_irqsave(&tx->lock, flags);
893 --tx->submitted_urbs;
894 if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
895 ieee80211_wake_queues(zd_usb_to_hw(usb));
896 tx->stopped = 0;
897 }
898 spin_unlock_irqrestore(&tx->lock, flags);
899 }
900
901 static void tx_inc_submitted_urbs(struct zd_usb *usb)
902 {
903 struct zd_usb_tx *tx = &usb->tx;
904 unsigned long flags;
905
906 spin_lock_irqsave(&tx->lock, flags);
907 ++tx->submitted_urbs;
908 if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
909 ieee80211_stop_queues(zd_usb_to_hw(usb));
910 tx->stopped = 1;
911 }
912 spin_unlock_irqrestore(&tx->lock, flags);
913 }
914
915 /**
916 * tx_urb_complete - completes the execution of an URB
917 * @urb: a URB
918 *
919 * This function is called if the URB has been transferred to a device or an
920 * error has happened.
921 */
922 static void tx_urb_complete(struct urb *urb)
923 {
924 int r;
925 struct sk_buff *skb;
926 struct ieee80211_tx_info *info;
927 struct zd_usb *usb;
928 struct zd_usb_tx *tx;
929
930 skb = (struct sk_buff *)urb->context;
931 info = IEEE80211_SKB_CB(skb);
932 /*
933 * grab 'usb' pointer before handing off the skb (since
934 * it might be freed by zd_mac_tx_to_dev or mac80211)
935 */
936 usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb;
937 tx = &usb->tx;
938
939 switch (urb->status) {
940 case 0:
941 break;
942 case -ESHUTDOWN:
943 case -EINVAL:
944 case -ENODEV:
945 case -ENOENT:
946 case -ECONNRESET:
947 case -EPIPE:
948 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
949 break;
950 default:
951 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
952 goto resubmit;
953 }
954 free_urb:
955 skb_unlink(skb, &usb->tx.submitted_skbs);
956 zd_mac_tx_to_dev(skb, urb->status);
957 usb_free_urb(urb);
958 tx_dec_submitted_urbs(usb);
959 return;
960 resubmit:
961 usb_anchor_urb(urb, &tx->submitted);
962 r = usb_submit_urb(urb, GFP_ATOMIC);
963 if (r) {
964 usb_unanchor_urb(urb);
965 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
966 goto free_urb;
967 }
968 }
969
970 /**
971 * zd_usb_tx: initiates transfer of a frame of the device
972 *
973 * @usb: the zd1211rw-private USB structure
974 * @skb: a &struct sk_buff pointer
975 *
976 * This function tranmits a frame to the device. It doesn't wait for
977 * completion. The frame must contain the control set and have all the
978 * control set information available.
979 *
980 * The function returns 0 if the transfer has been successfully initiated.
981 */
982 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
983 {
984 int r;
985 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
986 struct usb_device *udev = zd_usb_to_usbdev(usb);
987 struct urb *urb;
988 struct zd_usb_tx *tx = &usb->tx;
989
990 if (!atomic_read(&tx->enabled)) {
991 r = -ENOENT;
992 goto out;
993 }
994
995 urb = usb_alloc_urb(0, GFP_ATOMIC);
996 if (!urb) {
997 r = -ENOMEM;
998 goto out;
999 }
1000
1001 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
1002 skb->data, skb->len, tx_urb_complete, skb);
1003
1004 info->rate_driver_data[1] = (void *)jiffies;
1005 skb_queue_tail(&tx->submitted_skbs, skb);
1006 usb_anchor_urb(urb, &tx->submitted);
1007
1008 r = usb_submit_urb(urb, GFP_ATOMIC);
1009 if (r) {
1010 dev_dbg_f(zd_usb_dev(usb), "error submit urb %p %d\n", urb, r);
1011 usb_unanchor_urb(urb);
1012 skb_unlink(skb, &tx->submitted_skbs);
1013 goto error;
1014 }
1015 tx_inc_submitted_urbs(usb);
1016 return 0;
1017 error:
1018 usb_free_urb(urb);
1019 out:
1020 return r;
1021 }
1022
1023 static bool zd_tx_timeout(struct zd_usb *usb)
1024 {
1025 struct zd_usb_tx *tx = &usb->tx;
1026 struct sk_buff_head *q = &tx->submitted_skbs;
1027 struct sk_buff *skb, *skbnext;
1028 struct ieee80211_tx_info *info;
1029 unsigned long flags, trans_start;
1030 bool have_timedout = false;
1031
1032 spin_lock_irqsave(&q->lock, flags);
1033 skb_queue_walk_safe(q, skb, skbnext) {
1034 info = IEEE80211_SKB_CB(skb);
1035 trans_start = (unsigned long)info->rate_driver_data[1];
1036
1037 if (time_is_before_jiffies(trans_start + ZD_TX_TIMEOUT)) {
1038 have_timedout = true;
1039 break;
1040 }
1041 }
1042 spin_unlock_irqrestore(&q->lock, flags);
1043
1044 return have_timedout;
1045 }
1046
1047 static void zd_tx_watchdog_handler(struct work_struct *work)
1048 {
1049 struct zd_usb *usb =
1050 container_of(work, struct zd_usb, tx.watchdog_work.work);
1051 struct zd_usb_tx *tx = &usb->tx;
1052
1053 if (!atomic_read(&tx->enabled) || !tx->watchdog_enabled)
1054 goto out;
1055 if (!zd_tx_timeout(usb))
1056 goto out;
1057
1058 /* TX halted, try reset */
1059 dev_warn(zd_usb_dev(usb), "TX-stall detected, reseting device...");
1060
1061 usb_queue_reset_device(usb->intf);
1062
1063 /* reset will stop this worker, don't rearm */
1064 return;
1065 out:
1066 queue_delayed_work(zd_workqueue, &tx->watchdog_work,
1067 ZD_TX_WATCHDOG_INTERVAL);
1068 }
1069
1070 void zd_tx_watchdog_enable(struct zd_usb *usb)
1071 {
1072 struct zd_usb_tx *tx = &usb->tx;
1073
1074 if (!tx->watchdog_enabled) {
1075 dev_dbg_f(zd_usb_dev(usb), "\n");
1076 queue_delayed_work(zd_workqueue, &tx->watchdog_work,
1077 ZD_TX_WATCHDOG_INTERVAL);
1078 tx->watchdog_enabled = 1;
1079 }
1080 }
1081
1082 void zd_tx_watchdog_disable(struct zd_usb *usb)
1083 {
1084 struct zd_usb_tx *tx = &usb->tx;
1085
1086 if (tx->watchdog_enabled) {
1087 dev_dbg_f(zd_usb_dev(usb), "\n");
1088 tx->watchdog_enabled = 0;
1089 cancel_delayed_work_sync(&tx->watchdog_work);
1090 }
1091 }
1092
1093 static void zd_rx_idle_timer_handler(struct work_struct *work)
1094 {
1095 struct zd_usb *usb =
1096 container_of(work, struct zd_usb, rx.idle_work.work);
1097 struct zd_mac *mac = zd_usb_to_mac(usb);
1098
1099 if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags))
1100 return;
1101
1102 dev_dbg_f(zd_usb_dev(usb), "\n");
1103
1104 /* 30 seconds since last rx, reset rx */
1105 zd_usb_reset_rx(usb);
1106 }
1107
1108 void zd_usb_reset_rx_idle_timer(struct zd_usb *usb)
1109 {
1110 struct zd_usb_rx *rx = &usb->rx;
1111
1112 cancel_delayed_work(&rx->idle_work);
1113 queue_delayed_work(zd_workqueue, &rx->idle_work, ZD_RX_IDLE_INTERVAL);
1114 }
1115
1116 static inline void init_usb_interrupt(struct zd_usb *usb)
1117 {
1118 struct zd_usb_interrupt *intr = &usb->intr;
1119
1120 spin_lock_init(&intr->lock);
1121 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
1122 init_completion(&intr->read_regs.completion);
1123 intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
1124 }
1125
1126 static inline void init_usb_rx(struct zd_usb *usb)
1127 {
1128 struct zd_usb_rx *rx = &usb->rx;
1129 spin_lock_init(&rx->lock);
1130 mutex_init(&rx->setup_mutex);
1131 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
1132 rx->usb_packet_size = 512;
1133 } else {
1134 rx->usb_packet_size = 64;
1135 }
1136 ZD_ASSERT(rx->fragment_length == 0);
1137 INIT_DELAYED_WORK(&rx->idle_work, zd_rx_idle_timer_handler);
1138 }
1139
1140 static inline void init_usb_tx(struct zd_usb *usb)
1141 {
1142 struct zd_usb_tx *tx = &usb->tx;
1143 spin_lock_init(&tx->lock);
1144 atomic_set(&tx->enabled, 0);
1145 tx->stopped = 0;
1146 skb_queue_head_init(&tx->submitted_skbs);
1147 init_usb_anchor(&tx->submitted);
1148 tx->submitted_urbs = 0;
1149 tx->watchdog_enabled = 0;
1150 INIT_DELAYED_WORK(&tx->watchdog_work, zd_tx_watchdog_handler);
1151 }
1152
1153 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
1154 struct usb_interface *intf)
1155 {
1156 memset(usb, 0, sizeof(*usb));
1157 usb->intf = usb_get_intf(intf);
1158 usb_set_intfdata(usb->intf, hw);
1159 init_usb_interrupt(usb);
1160 init_usb_tx(usb);
1161 init_usb_rx(usb);
1162 }
1163
1164 void zd_usb_clear(struct zd_usb *usb)
1165 {
1166 usb_set_intfdata(usb->intf, NULL);
1167 usb_put_intf(usb->intf);
1168 ZD_MEMCLEAR(usb, sizeof(*usb));
1169 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
1170 }
1171
1172 static const char *speed(enum usb_device_speed speed)
1173 {
1174 switch (speed) {
1175 case USB_SPEED_LOW:
1176 return "low";
1177 case USB_SPEED_FULL:
1178 return "full";
1179 case USB_SPEED_HIGH:
1180 return "high";
1181 default:
1182 return "unknown speed";
1183 }
1184 }
1185
1186 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1187 {
1188 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1189 le16_to_cpu(udev->descriptor.idVendor),
1190 le16_to_cpu(udev->descriptor.idProduct),
1191 get_bcdDevice(udev),
1192 speed(udev->speed));
1193 }
1194
1195 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1196 {
1197 struct usb_device *udev = interface_to_usbdev(usb->intf);
1198 return scnprint_id(udev, buffer, size);
1199 }
1200
1201 #ifdef DEBUG
1202 static void print_id(struct usb_device *udev)
1203 {
1204 char buffer[40];
1205
1206 scnprint_id(udev, buffer, sizeof(buffer));
1207 buffer[sizeof(buffer)-1] = 0;
1208 dev_dbg_f(&udev->dev, "%s\n", buffer);
1209 }
1210 #else
1211 #define print_id(udev) do { } while (0)
1212 #endif
1213
1214 static int eject_installer(struct usb_interface *intf)
1215 {
1216 struct usb_device *udev = interface_to_usbdev(intf);
1217 struct usb_host_interface *iface_desc = &intf->altsetting[0];
1218 struct usb_endpoint_descriptor *endpoint;
1219 unsigned char *cmd;
1220 u8 bulk_out_ep;
1221 int r;
1222
1223 /* Find bulk out endpoint */
1224 for (r = 1; r >= 0; r--) {
1225 endpoint = &iface_desc->endpoint[r].desc;
1226 if (usb_endpoint_dir_out(endpoint) &&
1227 usb_endpoint_xfer_bulk(endpoint)) {
1228 bulk_out_ep = endpoint->bEndpointAddress;
1229 break;
1230 }
1231 }
1232 if (r == -1) {
1233 dev_err(&udev->dev,
1234 "zd1211rw: Could not find bulk out endpoint\n");
1235 return -ENODEV;
1236 }
1237
1238 cmd = kzalloc(31, GFP_KERNEL);
1239 if (cmd == NULL)
1240 return -ENODEV;
1241
1242 /* USB bulk command block */
1243 cmd[0] = 0x55; /* bulk command signature */
1244 cmd[1] = 0x53; /* bulk command signature */
1245 cmd[2] = 0x42; /* bulk command signature */
1246 cmd[3] = 0x43; /* bulk command signature */
1247 cmd[14] = 6; /* command length */
1248
1249 cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1250 cmd[19] = 0x2; /* eject disc */
1251
1252 dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1253 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1254 cmd, 31, NULL, 2000);
1255 kfree(cmd);
1256 if (r)
1257 return r;
1258
1259 /* At this point, the device disconnects and reconnects with the real
1260 * ID numbers. */
1261
1262 usb_set_intfdata(intf, NULL);
1263 return 0;
1264 }
1265
1266 int zd_usb_init_hw(struct zd_usb *usb)
1267 {
1268 int r;
1269 struct zd_mac *mac = zd_usb_to_mac(usb);
1270
1271 dev_dbg_f(zd_usb_dev(usb), "\n");
1272
1273 r = upload_firmware(usb);
1274 if (r) {
1275 dev_err(zd_usb_dev(usb),
1276 "couldn't load firmware. Error number %d\n", r);
1277 return r;
1278 }
1279
1280 r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1281 if (r) {
1282 dev_dbg_f(zd_usb_dev(usb),
1283 "couldn't reset configuration. Error number %d\n", r);
1284 return r;
1285 }
1286
1287 r = zd_mac_init_hw(mac->hw);
1288 if (r) {
1289 dev_dbg_f(zd_usb_dev(usb),
1290 "couldn't initialize mac. Error number %d\n", r);
1291 return r;
1292 }
1293
1294 usb->initialized = 1;
1295 return 0;
1296 }
1297
1298 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1299 {
1300 int r;
1301 struct usb_device *udev = interface_to_usbdev(intf);
1302 struct zd_usb *usb;
1303 struct ieee80211_hw *hw = NULL;
1304
1305 print_id(udev);
1306
1307 if (id->driver_info & DEVICE_INSTALLER)
1308 return eject_installer(intf);
1309
1310 switch (udev->speed) {
1311 case USB_SPEED_LOW:
1312 case USB_SPEED_FULL:
1313 case USB_SPEED_HIGH:
1314 break;
1315 default:
1316 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1317 r = -ENODEV;
1318 goto error;
1319 }
1320
1321 r = usb_reset_device(udev);
1322 if (r) {
1323 dev_err(&intf->dev,
1324 "couldn't reset usb device. Error number %d\n", r);
1325 goto error;
1326 }
1327
1328 hw = zd_mac_alloc_hw(intf);
1329 if (hw == NULL) {
1330 r = -ENOMEM;
1331 goto error;
1332 }
1333
1334 usb = &zd_hw_mac(hw)->chip.usb;
1335 usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1336
1337 r = zd_mac_preinit_hw(hw);
1338 if (r) {
1339 dev_dbg_f(&intf->dev,
1340 "couldn't initialize mac. Error number %d\n", r);
1341 goto error;
1342 }
1343
1344 r = ieee80211_register_hw(hw);
1345 if (r) {
1346 dev_dbg_f(&intf->dev,
1347 "couldn't register device. Error number %d\n", r);
1348 goto error;
1349 }
1350
1351 dev_dbg_f(&intf->dev, "successful\n");
1352 dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
1353 return 0;
1354 error:
1355 usb_reset_device(interface_to_usbdev(intf));
1356 if (hw) {
1357 zd_mac_clear(zd_hw_mac(hw));
1358 ieee80211_free_hw(hw);
1359 }
1360 return r;
1361 }
1362
1363 static void disconnect(struct usb_interface *intf)
1364 {
1365 struct ieee80211_hw *hw = zd_intf_to_hw(intf);
1366 struct zd_mac *mac;
1367 struct zd_usb *usb;
1368
1369 /* Either something really bad happened, or we're just dealing with
1370 * a DEVICE_INSTALLER. */
1371 if (hw == NULL)
1372 return;
1373
1374 mac = zd_hw_mac(hw);
1375 usb = &mac->chip.usb;
1376
1377 dev_dbg_f(zd_usb_dev(usb), "\n");
1378
1379 ieee80211_unregister_hw(hw);
1380
1381 /* Just in case something has gone wrong! */
1382 zd_usb_disable_tx(usb);
1383 zd_usb_disable_rx(usb);
1384 zd_usb_disable_int(usb);
1385
1386 /* If the disconnect has been caused by a removal of the
1387 * driver module, the reset allows reloading of the driver. If the
1388 * reset will not be executed here, the upload of the firmware in the
1389 * probe function caused by the reloading of the driver will fail.
1390 */
1391 usb_reset_device(interface_to_usbdev(intf));
1392
1393 zd_mac_clear(mac);
1394 ieee80211_free_hw(hw);
1395 dev_dbg(&intf->dev, "disconnected\n");
1396 }
1397
1398 static void zd_usb_resume(struct zd_usb *usb)
1399 {
1400 struct zd_mac *mac = zd_usb_to_mac(usb);
1401 int r;
1402
1403 dev_dbg_f(zd_usb_dev(usb), "\n");
1404
1405 r = zd_op_start(zd_usb_to_hw(usb));
1406 if (r < 0) {
1407 dev_warn(zd_usb_dev(usb), "Device resume failed "
1408 "with error code %d. Retrying...\n", r);
1409 if (usb->was_running)
1410 set_bit(ZD_DEVICE_RUNNING, &mac->flags);
1411 usb_queue_reset_device(usb->intf);
1412 return;
1413 }
1414
1415 if (mac->type != NL80211_IFTYPE_UNSPECIFIED) {
1416 r = zd_restore_settings(mac);
1417 if (r < 0) {
1418 dev_dbg(zd_usb_dev(usb),
1419 "failed to restore settings, %d\n", r);
1420 return;
1421 }
1422 }
1423 }
1424
1425 static void zd_usb_stop(struct zd_usb *usb)
1426 {
1427 dev_dbg_f(zd_usb_dev(usb), "\n");
1428
1429 zd_op_stop(zd_usb_to_hw(usb));
1430
1431 zd_usb_disable_tx(usb);
1432 zd_usb_disable_rx(usb);
1433 zd_usb_disable_int(usb);
1434
1435 usb->initialized = 0;
1436 }
1437
1438 static int pre_reset(struct usb_interface *intf)
1439 {
1440 struct ieee80211_hw *hw = usb_get_intfdata(intf);
1441 struct zd_mac *mac;
1442 struct zd_usb *usb;
1443
1444 if (!hw || intf->condition != USB_INTERFACE_BOUND)
1445 return 0;
1446
1447 mac = zd_hw_mac(hw);
1448 usb = &mac->chip.usb;
1449
1450 usb->was_running = test_bit(ZD_DEVICE_RUNNING, &mac->flags);
1451
1452 zd_usb_stop(usb);
1453
1454 mutex_lock(&mac->chip.mutex);
1455 return 0;
1456 }
1457
1458 static int post_reset(struct usb_interface *intf)
1459 {
1460 struct ieee80211_hw *hw = usb_get_intfdata(intf);
1461 struct zd_mac *mac;
1462 struct zd_usb *usb;
1463
1464 if (!hw || intf->condition != USB_INTERFACE_BOUND)
1465 return 0;
1466
1467 mac = zd_hw_mac(hw);
1468 usb = &mac->chip.usb;
1469
1470 mutex_unlock(&mac->chip.mutex);
1471
1472 if (usb->was_running)
1473 zd_usb_resume(usb);
1474 return 0;
1475 }
1476
1477 static struct usb_driver driver = {
1478 .name = KBUILD_MODNAME,
1479 .id_table = usb_ids,
1480 .probe = probe,
1481 .disconnect = disconnect,
1482 .pre_reset = pre_reset,
1483 .post_reset = post_reset,
1484 };
1485
1486 struct workqueue_struct *zd_workqueue;
1487
1488 static int __init usb_init(void)
1489 {
1490 int r;
1491
1492 pr_debug("%s usb_init()\n", driver.name);
1493
1494 zd_workqueue = create_singlethread_workqueue(driver.name);
1495 if (zd_workqueue == NULL) {
1496 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1497 return -ENOMEM;
1498 }
1499
1500 r = usb_register(&driver);
1501 if (r) {
1502 destroy_workqueue(zd_workqueue);
1503 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1504 driver.name, r);
1505 return r;
1506 }
1507
1508 pr_debug("%s initialized\n", driver.name);
1509 return 0;
1510 }
1511
1512 static void __exit usb_exit(void)
1513 {
1514 pr_debug("%s usb_exit()\n", driver.name);
1515 usb_deregister(&driver);
1516 destroy_workqueue(zd_workqueue);
1517 }
1518
1519 module_init(usb_init);
1520 module_exit(usb_exit);
1521
1522 static int usb_int_regs_length(unsigned int count)
1523 {
1524 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1525 }
1526
1527 static void prepare_read_regs_int(struct zd_usb *usb)
1528 {
1529 struct zd_usb_interrupt *intr = &usb->intr;
1530
1531 spin_lock_irq(&intr->lock);
1532 intr->read_regs_enabled = 1;
1533 INIT_COMPLETION(intr->read_regs.completion);
1534 spin_unlock_irq(&intr->lock);
1535 }
1536
1537 static void disable_read_regs_int(struct zd_usb *usb)
1538 {
1539 struct zd_usb_interrupt *intr = &usb->intr;
1540
1541 spin_lock_irq(&intr->lock);
1542 intr->read_regs_enabled = 0;
1543 spin_unlock_irq(&intr->lock);
1544 }
1545
1546 static int get_results(struct zd_usb *usb, u16 *values,
1547 struct usb_req_read_regs *req, unsigned int count)
1548 {
1549 int r;
1550 int i;
1551 struct zd_usb_interrupt *intr = &usb->intr;
1552 struct read_regs_int *rr = &intr->read_regs;
1553 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1554
1555 spin_lock_irq(&intr->lock);
1556
1557 r = -EIO;
1558 /* The created block size seems to be larger than expected.
1559 * However results appear to be correct.
1560 */
1561 if (rr->length < usb_int_regs_length(count)) {
1562 dev_dbg_f(zd_usb_dev(usb),
1563 "error: actual length %d less than expected %d\n",
1564 rr->length, usb_int_regs_length(count));
1565 goto error_unlock;
1566 }
1567 if (rr->length > sizeof(rr->buffer)) {
1568 dev_dbg_f(zd_usb_dev(usb),
1569 "error: actual length %d exceeds buffer size %zu\n",
1570 rr->length, sizeof(rr->buffer));
1571 goto error_unlock;
1572 }
1573
1574 for (i = 0; i < count; i++) {
1575 struct reg_data *rd = &regs->regs[i];
1576 if (rd->addr != req->addr[i]) {
1577 dev_dbg_f(zd_usb_dev(usb),
1578 "rd[%d] addr %#06hx expected %#06hx\n", i,
1579 le16_to_cpu(rd->addr),
1580 le16_to_cpu(req->addr[i]));
1581 goto error_unlock;
1582 }
1583 values[i] = le16_to_cpu(rd->value);
1584 }
1585
1586 r = 0;
1587 error_unlock:
1588 spin_unlock_irq(&intr->lock);
1589 return r;
1590 }
1591
1592 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1593 const zd_addr_t *addresses, unsigned int count)
1594 {
1595 int r;
1596 int i, req_len, actual_req_len;
1597 struct usb_device *udev;
1598 struct usb_req_read_regs *req = NULL;
1599 unsigned long timeout;
1600
1601 if (count < 1) {
1602 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1603 return -EINVAL;
1604 }
1605 if (count > USB_MAX_IOREAD16_COUNT) {
1606 dev_dbg_f(zd_usb_dev(usb),
1607 "error: count %u exceeds possible max %u\n",
1608 count, USB_MAX_IOREAD16_COUNT);
1609 return -EINVAL;
1610 }
1611 if (in_atomic()) {
1612 dev_dbg_f(zd_usb_dev(usb),
1613 "error: io in atomic context not supported\n");
1614 return -EWOULDBLOCK;
1615 }
1616 if (!usb_int_enabled(usb)) {
1617 dev_dbg_f(zd_usb_dev(usb),
1618 "error: usb interrupt not enabled\n");
1619 return -EWOULDBLOCK;
1620 }
1621
1622 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1623 BUILD_BUG_ON(sizeof(struct usb_req_read_regs) + USB_MAX_IOREAD16_COUNT *
1624 sizeof(__le16) > sizeof(usb->req_buf));
1625 BUG_ON(sizeof(struct usb_req_read_regs) + count * sizeof(__le16) >
1626 sizeof(usb->req_buf));
1627
1628 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1629 req = (void *)usb->req_buf;
1630
1631 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1632 for (i = 0; i < count; i++)
1633 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1634
1635 udev = zd_usb_to_usbdev(usb);
1636 prepare_read_regs_int(usb);
1637 r = usb_interrupt_msg(udev, usb_sndintpipe(udev, EP_REGS_OUT),
1638 req, req_len, &actual_req_len, 50 /* ms */);
1639 if (r) {
1640 dev_dbg_f(zd_usb_dev(usb),
1641 "error in usb_interrupt_msg(). Error number %d\n", r);
1642 goto error;
1643 }
1644 if (req_len != actual_req_len) {
1645 dev_dbg_f(zd_usb_dev(usb), "error in usb_interrupt_msg()\n"
1646 " req_len %d != actual_req_len %d\n",
1647 req_len, actual_req_len);
1648 r = -EIO;
1649 goto error;
1650 }
1651
1652 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1653 msecs_to_jiffies(50));
1654 if (!timeout) {
1655 disable_read_regs_int(usb);
1656 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1657 r = -ETIMEDOUT;
1658 goto error;
1659 }
1660
1661 r = get_results(usb, values, req, count);
1662 error:
1663 return r;
1664 }
1665
1666 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1667 unsigned int count)
1668 {
1669 int r;
1670 struct usb_device *udev;
1671 struct usb_req_write_regs *req = NULL;
1672 int i, req_len, actual_req_len;
1673
1674 if (count == 0)
1675 return 0;
1676 if (count > USB_MAX_IOWRITE16_COUNT) {
1677 dev_dbg_f(zd_usb_dev(usb),
1678 "error: count %u exceeds possible max %u\n",
1679 count, USB_MAX_IOWRITE16_COUNT);
1680 return -EINVAL;
1681 }
1682 if (in_atomic()) {
1683 dev_dbg_f(zd_usb_dev(usb),
1684 "error: io in atomic context not supported\n");
1685 return -EWOULDBLOCK;
1686 }
1687
1688 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1689 BUILD_BUG_ON(sizeof(struct usb_req_write_regs) +
1690 USB_MAX_IOWRITE16_COUNT * sizeof(struct reg_data) >
1691 sizeof(usb->req_buf));
1692 BUG_ON(sizeof(struct usb_req_write_regs) +
1693 count * sizeof(struct reg_data) >
1694 sizeof(usb->req_buf));
1695
1696 req_len = sizeof(struct usb_req_write_regs) +
1697 count * sizeof(struct reg_data);
1698 req = (void *)usb->req_buf;
1699
1700 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1701 for (i = 0; i < count; i++) {
1702 struct reg_data *rw = &req->reg_writes[i];
1703 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1704 rw->value = cpu_to_le16(ioreqs[i].value);
1705 }
1706
1707 udev = zd_usb_to_usbdev(usb);
1708 r = usb_interrupt_msg(udev, usb_sndintpipe(udev, EP_REGS_OUT),
1709 req, req_len, &actual_req_len, 50 /* ms */);
1710 if (r) {
1711 dev_dbg_f(zd_usb_dev(usb),
1712 "error in usb_interrupt_msg(). Error number %d\n", r);
1713 goto error;
1714 }
1715 if (req_len != actual_req_len) {
1716 dev_dbg_f(zd_usb_dev(usb),
1717 "error in usb_interrupt_msg()"
1718 " req_len %d != actual_req_len %d\n",
1719 req_len, actual_req_len);
1720 r = -EIO;
1721 goto error;
1722 }
1723
1724 /* FALL-THROUGH with r == 0 */
1725 error:
1726 return r;
1727 }
1728
1729 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1730 {
1731 int r;
1732 struct usb_device *udev;
1733 struct usb_req_rfwrite *req = NULL;
1734 int i, req_len, actual_req_len;
1735 u16 bit_value_template;
1736
1737 if (in_atomic()) {
1738 dev_dbg_f(zd_usb_dev(usb),
1739 "error: io in atomic context not supported\n");
1740 return -EWOULDBLOCK;
1741 }
1742 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1743 dev_dbg_f(zd_usb_dev(usb),
1744 "error: bits %d are smaller than"
1745 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1746 bits, USB_MIN_RFWRITE_BIT_COUNT);
1747 return -EINVAL;
1748 }
1749 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1750 dev_dbg_f(zd_usb_dev(usb),
1751 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1752 bits, USB_MAX_RFWRITE_BIT_COUNT);
1753 return -EINVAL;
1754 }
1755 #ifdef DEBUG
1756 if (value & (~0UL << bits)) {
1757 dev_dbg_f(zd_usb_dev(usb),
1758 "error: value %#09x has bits >= %d set\n",
1759 value, bits);
1760 return -EINVAL;
1761 }
1762 #endif /* DEBUG */
1763
1764 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1765
1766 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1767 if (r) {
1768 dev_dbg_f(zd_usb_dev(usb),
1769 "error %d: Couldn't read CR203\n", r);
1770 return r;
1771 }
1772 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1773
1774 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1775 BUILD_BUG_ON(sizeof(struct usb_req_rfwrite) +
1776 USB_MAX_RFWRITE_BIT_COUNT * sizeof(__le16) >
1777 sizeof(usb->req_buf));
1778 BUG_ON(sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16) >
1779 sizeof(usb->req_buf));
1780
1781 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1782 req = (void *)usb->req_buf;
1783
1784 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1785 /* 1: 3683a, but not used in ZYDAS driver */
1786 req->value = cpu_to_le16(2);
1787 req->bits = cpu_to_le16(bits);
1788
1789 for (i = 0; i < bits; i++) {
1790 u16 bv = bit_value_template;
1791 if (value & (1 << (bits-1-i)))
1792 bv |= RF_DATA;
1793 req->bit_values[i] = cpu_to_le16(bv);
1794 }
1795
1796 udev = zd_usb_to_usbdev(usb);
1797 r = usb_interrupt_msg(udev, usb_sndintpipe(udev, EP_REGS_OUT),
1798 req, req_len, &actual_req_len, 50 /* ms */);
1799 if (r) {
1800 dev_dbg_f(zd_usb_dev(usb),
1801 "error in usb_interrupt_msg(). Error number %d\n", r);
1802 goto out;
1803 }
1804 if (req_len != actual_req_len) {
1805 dev_dbg_f(zd_usb_dev(usb), "error in usb_interrupt_msg()"
1806 " req_len %d != actual_req_len %d\n",
1807 req_len, actual_req_len);
1808 r = -EIO;
1809 goto out;
1810 }
1811
1812 /* FALL-THROUGH with r == 0 */
1813 out:
1814 return r;
1815 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree