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Merge branch 'for-2.6.28' of git://linux-nfs.org/~bfields/linux
[linux-2.6-block.git] / drivers / net / wireless / zd1211rw / zd_usb.c
CommitLineData
66bb42fd
DD		 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>
e85d0918
DD		 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
d066c219 22#include <linux/kernel.h>
e85d0918 23#include <linux/init.h>
e85d0918
DD		 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>
bc5f06a8 29#include <linux/workqueue.h>
459c51ad 30#include <net/mac80211.h>
c248725b 31#include <asm/unaligned.h>
e85d0918
DD		 32
33#include "zd_def.h"
e85d0918
DD		 34#include "zd_mac.h"
35#include "zd_usb.h"
e85d0918
DD		 36
37static 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 },
aa1d3a18 44 { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
e85d0918 45 { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
dd2f5538 46 { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
1b865491 47 { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
12f39308 48 { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
4ceb7e99 49 { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
fca2714f 50 { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
fc3e39be 51 { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
f2423723
DD		 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 },
a362bf57 55 { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
229782a3 56 { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
a3fa3aba 57 { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
a9eea9ae 58 { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
ababda03 59 { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 },
269fca0e 60 { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
5d89945e 61 { USB_DEVICE(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 },
e85d0918
DD		 62 /* ZD1211B */
63 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
0feec9df 64 { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B },
e85d0918 65 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
dd2f5538 66 { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
943599ee 67 { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
8e87295b 68 { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
9dfd5500 69 { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
a2bdcc67
DD		 70 { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
71 { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
33218ba1 72 { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
2e9b2467 73 { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
aec91028
DD		 74 { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
75 { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
c445a31c 76 { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
5d082fe8 77 { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
187bb417 78 { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
019a6755 79 { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
93f510bb 80 { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
6eb07250 81 { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
25343469 82 { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
8e97afe5 83 { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
475fed1e 84 { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
61ef6062 85 { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
0feec9df 86 { USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B },
a1030e92
DD		 87 /* "Driverless" devices that need ejecting */
88 { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
aa1d3a18 89 { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
e85d0918
DD		 90 {}
91};
92
93MODULE_LICENSE("GPL");
94MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
95MODULE_AUTHOR("Ulrich Kunitz");
96MODULE_AUTHOR("Daniel Drake");
97MODULE_VERSION("1.0");
98MODULE_DEVICE_TABLE(usb, usb_ids);
99
100#define FW_ZD1211_PREFIX "zd1211/zd1211_"
101#define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
102
e85d0918 103/* USB device initialization */
72e77a8a 104static void int_urb_complete(struct urb *urb);
e85d0918
DD		 105
106static int request_fw_file(
107 const struct firmware **fw, const char *name, struct device *device)
108{
109 int r;
110
111 dev_dbg_f(device, "fw name %s\n", name);
112
113 r = request_firmware(fw, name, device);
114 if (r)
115 dev_err(device,
116 "Could not load firmware file %s. Error number %d\n",
117 name, r);
118 return r;
119}
120
121static inline u16 get_bcdDevice(const struct usb_device *udev)
122{
123 return le16_to_cpu(udev->descriptor.bcdDevice);
124}
125
126enum upload_code_flags {
127 REBOOT = 1,
128};
129
130/* Ensures that MAX_TRANSFER_SIZE is even. */
131#define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
132
133static int upload_code(struct usb_device *udev,
134 const u8 *data, size_t size, u16 code_offset, int flags)
135{
136 u8 *p;
137 int r;
138
139 /* USB request blocks need "kmalloced" buffers.
140 */
141 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
142 if (!p) {
143 dev_err(&udev->dev, "out of memory\n");
144 r = -ENOMEM;
145 goto error;
146 }
147
148 size &= ~1;
149 while (size > 0) {
150 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
151 size : MAX_TRANSFER_SIZE;
152
153 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
154
155 memcpy(p, data, transfer_size);
156 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
157 USB_REQ_FIRMWARE_DOWNLOAD,
158 USB_DIR_OUT | USB_TYPE_VENDOR,
159 code_offset, 0, p, transfer_size, 1000 /* ms */);
160 if (r < 0) {
161 dev_err(&udev->dev,
162 "USB control request for firmware upload"
163 " failed. Error number %d\n", r);
164 goto error;
165 }
166 transfer_size = r & ~1;
167
168 size -= transfer_size;
169 data += transfer_size;
170 code_offset += transfer_size/sizeof(u16);
171 }
172
173 if (flags & REBOOT) {
174 u8 ret;
175
a8c4ea7a 176 /* Use "DMA-aware" buffer. */
e85d0918
DD		 177 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
178 USB_REQ_FIRMWARE_CONFIRM,
179 USB_DIR_IN | USB_TYPE_VENDOR,
a8c4ea7a 180 0, 0, p, sizeof(ret), 5000 /* ms */);
e85d0918
DD		 181 if (r != sizeof(ret)) {
182 dev_err(&udev->dev,
183 "control request firmeware confirmation failed."
184 " Return value %d\n", r);
185 if (r >= 0)
186 r = -ENODEV;
187 goto error;
188 }
a8c4ea7a 189 ret = p[0];
e85d0918
DD		 190 if (ret & 0x80) {
191 dev_err(&udev->dev,
192 "Internal error while downloading."
193 " Firmware confirm return value %#04x\n",
194 (unsigned int)ret);
195 r = -ENODEV;
196 goto error;
197 }
198 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
199 (unsigned int)ret);
200 }
201
202 r = 0;
203error:
204 kfree(p);
205 return r;
206}
207
208static u16 get_word(const void *data, u16 offset)
209{
210 const __le16 *p = data;
211 return le16_to_cpu(p[offset]);
212}
213
74553aed 214static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
e85d0918
DD		 215 const char* postfix)
216{
217 scnprintf(buffer, size, "%s%s",
74553aed 218 usb->is_zd1211b ?
e85d0918
DD		 219 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
220 postfix);
221 return buffer;
222}
223
74553aed 224static int handle_version_mismatch(struct zd_usb *usb,
d066c219
DD		 225 const struct firmware *ub_fw)
226{
74553aed 227 struct usb_device *udev = zd_usb_to_usbdev(usb);
d066c219
DD		 228 const struct firmware *ur_fw = NULL;
229 int offset;
230 int r = 0;
231 char fw_name[128];
232
233 r = request_fw_file(&ur_fw,
74553aed 234 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
d066c219
DD		 235 &udev->dev);
236 if (r)
237 goto error;
238
ee302767 239 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
d066c219
DD		 240 if (r)
241 goto error;
242
ee302767 243 offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
d066c219 244 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
ee302767 245 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
d066c219
DD		 246
247 /* At this point, the vendor driver downloads the whole firmware
248 * image, hacks around with version IDs, and uploads it again,
249 * completely overwriting the boot code. We do not do this here as
250 * it is not required on any tested devices, and it is suspected to
251 * cause problems. */
252error:
253 release_firmware(ur_fw);
254 return r;
255}
256
74553aed 257static int upload_firmware(struct zd_usb *usb)
e85d0918
DD		 258{
259 int r;
260 u16 fw_bcdDevice;
261 u16 bcdDevice;
74553aed 262 struct usb_device *udev = zd_usb_to_usbdev(usb);
e85d0918
DD		 263 const struct firmware *ub_fw = NULL;
264 const struct firmware *uph_fw = NULL;
265 char fw_name[128];
266
267 bcdDevice = get_bcdDevice(udev);
268
269 r = request_fw_file(&ub_fw,
74553aed 270 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
e85d0918
DD		 271 &udev->dev);
272 if (r)
273 goto error;
274
ee302767 275 fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
e85d0918 276
e85d0918
DD		 277 if (fw_bcdDevice != bcdDevice) {
278 dev_info(&udev->dev,
d066c219
DD		 279 "firmware version %#06x and device bootcode version "
280 "%#06x differ\n", fw_bcdDevice, bcdDevice);
281 if (bcdDevice <= 0x4313)
282 dev_warn(&udev->dev, "device has old bootcode, please "
283 "report success or failure\n");
284
74553aed 285 r = handle_version_mismatch(usb, ub_fw);
d066c219
DD		 286 if (r)
287 goto error;
e85d0918
DD		 288 } else {
289 dev_dbg_f(&udev->dev,
290 "firmware device id %#06x is equal to the "
291 "actual device id\n", fw_bcdDevice);
292 }
293
294
295 r = request_fw_file(&uph_fw,
74553aed 296 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
e85d0918
DD		 297 &udev->dev);
298 if (r)
299 goto error;
300
ee302767 301 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
e85d0918
DD		 302 if (r) {
303 dev_err(&udev->dev,
304 "Could not upload firmware code uph. Error number %d\n",
305 r);
306 }
307
308 /* FALL-THROUGH */
309error:
310 release_firmware(ub_fw);
311 release_firmware(uph_fw);
312 return r;
313}
314
74553aed
DD		 315/* Read data from device address space using "firmware interface" which does
316 * not require firmware to be loaded. */
317int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
318{
319 int r;
320 struct usb_device *udev = zd_usb_to_usbdev(usb);
a8c4ea7a 321 u8 *buf;
74553aed 322
a8c4ea7a
AN		 323 /* Use "DMA-aware" buffer. */
324 buf = kmalloc(len, GFP_KERNEL);
325 if (!buf)
326 return -ENOMEM;
74553aed
DD		 327 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
328 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
a8c4ea7a 329 buf, len, 5000);
74553aed
DD		 330 if (r < 0) {
331 dev_err(&udev->dev,
332 "read over firmware interface failed: %d\n", r);
a8c4ea7a 333 goto exit;
74553aed
DD		 334 } else if (r != len) {
335 dev_err(&udev->dev,
336 "incomplete read over firmware interface: %d/%d\n",
337 r, len);
a8c4ea7a
AN		 338 r = -EIO;
339 goto exit;
74553aed 340 }
a8c4ea7a
AN		 341 r = 0;
342 memcpy(data, buf, len);
343exit:
344 kfree(buf);
345 return r;
74553aed
DD		 346}
347
e85d0918
DD		 348#define urb_dev(urb) (&(urb)->dev->dev)
349
350static inline void handle_regs_int(struct urb *urb)
351{
352 struct zd_usb *usb = urb->context;
353 struct zd_usb_interrupt *intr = &usb->intr;
354 int len;
72e77a8a 355 u16 int_num;
e85d0918
DD		 356
357 ZD_ASSERT(in_interrupt());
358 spin_lock(&intr->lock);
359
d63ddcec 360 int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
72e77a8a
LCC		 361 if (int_num == CR_INTERRUPT) {
362 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
363 memcpy(&mac->intr_buffer, urb->transfer_buffer,
364 USB_MAX_EP_INT_BUFFER);
365 schedule_work(&mac->process_intr);
366 } else if (intr->read_regs_enabled) {
e85d0918
DD		 367 intr->read_regs.length = len = urb->actual_length;
368
369 if (len > sizeof(intr->read_regs.buffer))
370 len = sizeof(intr->read_regs.buffer);
371 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
372 intr->read_regs_enabled = 0;
373 complete(&intr->read_regs.completion);
374 goto out;
375 }
376
e85d0918
DD		 377out:
378 spin_unlock(&intr->lock);
379}
380
7d12e780 381static void int_urb_complete(struct urb *urb)
e85d0918
DD		 382{
383 int r;
384 struct usb_int_header *hdr;
385
386 switch (urb->status) {
387 case 0:
388 break;
389 case -ESHUTDOWN:
390 case -EINVAL:
391 case -ENODEV:
392 case -ENOENT:
393 case -ECONNRESET:
e85d0918 394 case -EPIPE:
b312d799 395 goto kfree;
e85d0918
DD		 396 default:
397 goto resubmit;
398 }
399
400 if (urb->actual_length < sizeof(hdr)) {
401 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
402 goto resubmit;
403 }
404
405 hdr = urb->transfer_buffer;
406 if (hdr->type != USB_INT_TYPE) {
407 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
408 goto resubmit;
409 }
410
411 switch (hdr->id) {
412 case USB_INT_ID_REGS:
413 handle_regs_int(urb);
414 break;
415 case USB_INT_ID_RETRY_FAILED:
459c51ad 416 zd_mac_tx_failed(zd_usb_to_hw(urb->context));
e85d0918
DD		 417 break;
418 default:
419 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
420 (unsigned int)hdr->id);
421 goto resubmit;
422 }
423
424resubmit:
425 r = usb_submit_urb(urb, GFP_ATOMIC);
426 if (r) {
427 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
428 goto kfree;
429 }
430 return;
431kfree:
432 kfree(urb->transfer_buffer);
433}
434
435static inline int int_urb_interval(struct usb_device *udev)
436{
437 switch (udev->speed) {
438 case USB_SPEED_HIGH:
439 return 4;
440 case USB_SPEED_LOW:
441 return 10;
442 case USB_SPEED_FULL:
443 default:
444 return 1;
445 }
446}
447
448static inline int usb_int_enabled(struct zd_usb *usb)
449{
450 unsigned long flags;
451 struct zd_usb_interrupt *intr = &usb->intr;
452 struct urb *urb;
453
454 spin_lock_irqsave(&intr->lock, flags);
455 urb = intr->urb;
456 spin_unlock_irqrestore(&intr->lock, flags);
457 return urb != NULL;
458}
459
460int zd_usb_enable_int(struct zd_usb *usb)
461{
462 int r;
463 struct usb_device *udev;
464 struct zd_usb_interrupt *intr = &usb->intr;
465 void *transfer_buffer = NULL;
466 struct urb *urb;
467
468 dev_dbg_f(zd_usb_dev(usb), "\n");
469
35c3404e 470 urb = usb_alloc_urb(0, GFP_KERNEL);
e85d0918
DD		 471 if (!urb) {
472 r = -ENOMEM;
473 goto out;
474 }
475
476 ZD_ASSERT(!irqs_disabled());
477 spin_lock_irq(&intr->lock);
478 if (intr->urb) {
479 spin_unlock_irq(&intr->lock);
480 r = 0;
481 goto error_free_urb;
482 }
483 intr->urb = urb;
484 spin_unlock_irq(&intr->lock);
485
486 /* TODO: make it a DMA buffer */
487 r = -ENOMEM;
35c3404e 488 transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
e85d0918
DD		 489 if (!transfer_buffer) {
490 dev_dbg_f(zd_usb_dev(usb),
491 "couldn't allocate transfer_buffer\n");
492 goto error_set_urb_null;
493 }
494
495 udev = zd_usb_to_usbdev(usb);
496 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
497 transfer_buffer, USB_MAX_EP_INT_BUFFER,
498 int_urb_complete, usb,
499 intr->interval);
500
501 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
35c3404e 502 r = usb_submit_urb(urb, GFP_KERNEL);
e85d0918
DD		 503 if (r) {
504 dev_dbg_f(zd_usb_dev(usb),
505 "Couldn't submit urb. Error number %d\n", r);
506 goto error;
507 }
508
509 return 0;
510error:
511 kfree(transfer_buffer);
512error_set_urb_null:
513 spin_lock_irq(&intr->lock);
514 intr->urb = NULL;
515 spin_unlock_irq(&intr->lock);
516error_free_urb:
517 usb_free_urb(urb);
518out:
519 return r;
520}
521
522void zd_usb_disable_int(struct zd_usb *usb)
523{
524 unsigned long flags;
525 struct zd_usb_interrupt *intr = &usb->intr;
526 struct urb *urb;
527
528 spin_lock_irqsave(&intr->lock, flags);
529 urb = intr->urb;
530 if (!urb) {
531 spin_unlock_irqrestore(&intr->lock, flags);
532 return;
533 }
534 intr->urb = NULL;
535 spin_unlock_irqrestore(&intr->lock, flags);
536
537 usb_kill_urb(urb);
538 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
539 usb_free_urb(urb);
540}
541
542static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
543 unsigned int length)
544{
545 int i;
e85d0918
DD		 546 const struct rx_length_info *length_info;
547
548 if (length < sizeof(struct rx_length_info)) {
549 /* It's not a complete packet anyhow. */
550 return;
551 }
552 length_info = (struct rx_length_info *)
553 (buffer + length - sizeof(struct rx_length_info));
554
555 /* It might be that three frames are merged into a single URB
556 * transaction. We have to check for the length info tag.
557 *
558 * While testing we discovered that length_info might be unaligned,
559 * because if USB transactions are merged, the last packet will not
560 * be padded. Unaligned access might also happen if the length_info
561 * structure is not present.
562 */
533dd1b0 563 if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
b269825b 564 {
e85d0918
DD		 565 unsigned int l, k, n;
566 for (i = 0, l = 0;; i++) {
533dd1b0 567 k = get_unaligned_le16(&length_info->length[i]);
850c211c
UK		 568 if (k == 0)
569 return;
e85d0918
DD		 570 n = l+k;
571 if (n > length)
572 return;
459c51ad 573 zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
e85d0918
DD		 574 if (i >= 2)
575 return;
576 l = (n+3) & ~3;
577 }
578 } else {
459c51ad 579 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
e85d0918
DD		 580 }
581}
582
7d12e780 583static void rx_urb_complete(struct urb *urb)
e85d0918
DD		 584{
585 struct zd_usb *usb;
586 struct zd_usb_rx *rx;
587 const u8 *buffer;
588 unsigned int length;
589
590 switch (urb->status) {
591 case 0:
592 break;
593 case -ESHUTDOWN:
594 case -EINVAL:
595 case -ENODEV:
596 case -ENOENT:
597 case -ECONNRESET:
e85d0918 598 case -EPIPE:
b312d799 599 return;
e85d0918
DD		 600 default:
601 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
602 goto resubmit;
603 }
604
605 buffer = urb->transfer_buffer;
606 length = urb->actual_length;
607 usb = urb->context;
608 rx = &usb->rx;
609
610 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
611 /* If there is an old first fragment, we don't care. */
612 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
613 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
614 spin_lock(&rx->lock);
615 memcpy(rx->fragment, buffer, length);
616 rx->fragment_length = length;
617 spin_unlock(&rx->lock);
618 goto resubmit;
619 }
620
621 spin_lock(&rx->lock);
622 if (rx->fragment_length > 0) {
623 /* We are on a second fragment, we believe */
624 ZD_ASSERT(length + rx->fragment_length <=
625 ARRAY_SIZE(rx->fragment));
626 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
627 memcpy(rx->fragment+rx->fragment_length, buffer, length);
628 handle_rx_packet(usb, rx->fragment,
629 rx->fragment_length + length);
630 rx->fragment_length = 0;
631 spin_unlock(&rx->lock);
632 } else {
633 spin_unlock(&rx->lock);
634 handle_rx_packet(usb, buffer, length);
635 }
636
637resubmit:
638 usb_submit_urb(urb, GFP_ATOMIC);
639}
640
459c51ad 641static struct urb *alloc_rx_urb(struct zd_usb *usb)
e85d0918
DD		 642{
643 struct usb_device *udev = zd_usb_to_usbdev(usb);
644 struct urb *urb;
645 void *buffer;
646
35c3404e 647 urb = usb_alloc_urb(0, GFP_KERNEL);
e85d0918
DD		 648 if (!urb)
649 return NULL;
35c3404e 650 buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
e85d0918
DD		 651 &urb->transfer_dma);
652 if (!buffer) {
653 usb_free_urb(urb);
654 return NULL;
655 }
656
657 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
658 buffer, USB_MAX_RX_SIZE,
659 rx_urb_complete, usb);
660 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
661
662 return urb;
663}
664
459c51ad 665static void free_rx_urb(struct urb *urb)
e85d0918
DD		 666{
667 if (!urb)
668 return;
669 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
670 urb->transfer_buffer, urb->transfer_dma);
671 usb_free_urb(urb);
672}
673
674int zd_usb_enable_rx(struct zd_usb *usb)
675{
676 int i, r;
677 struct zd_usb_rx *rx = &usb->rx;
678 struct urb **urbs;
679
680 dev_dbg_f(zd_usb_dev(usb), "\n");
681
682 r = -ENOMEM;
459c51ad 683 urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
e85d0918
DD		 684 if (!urbs)
685 goto error;
459c51ad
DD		 686 for (i = 0; i < RX_URBS_COUNT; i++) {
687 urbs[i] = alloc_rx_urb(usb);
e85d0918
DD		 688 if (!urbs[i])
689 goto error;
690 }
691
692 ZD_ASSERT(!irqs_disabled());
693 spin_lock_irq(&rx->lock);
694 if (rx->urbs) {
695 spin_unlock_irq(&rx->lock);
696 r = 0;
697 goto error;
698 }
699 rx->urbs = urbs;
459c51ad 700 rx->urbs_count = RX_URBS_COUNT;
e85d0918
DD		 701 spin_unlock_irq(&rx->lock);
702
459c51ad 703 for (i = 0; i < RX_URBS_COUNT; i++) {
35c3404e 704 r = usb_submit_urb(urbs[i], GFP_KERNEL);
e85d0918
DD		 705 if (r)
706 goto error_submit;
707 }
708
709 return 0;
710error_submit:
459c51ad 711 for (i = 0; i < RX_URBS_COUNT; i++) {
e85d0918
DD		 712 usb_kill_urb(urbs[i]);
713 }
714 spin_lock_irq(&rx->lock);
715 rx->urbs = NULL;
716 rx->urbs_count = 0;
717 spin_unlock_irq(&rx->lock);
718error:
719 if (urbs) {
459c51ad
DD		 720 for (i = 0; i < RX_URBS_COUNT; i++)
721 free_rx_urb(urbs[i]);
e85d0918
DD		 722 }
723 return r;
724}
725
726void zd_usb_disable_rx(struct zd_usb *usb)
727{
728 int i;
729 unsigned long flags;
730 struct urb **urbs;
731 unsigned int count;
732 struct zd_usb_rx *rx = &usb->rx;
733
734 spin_lock_irqsave(&rx->lock, flags);
735 urbs = rx->urbs;
736 count = rx->urbs_count;
737 spin_unlock_irqrestore(&rx->lock, flags);
738 if (!urbs)
739 return;
740
741 for (i = 0; i < count; i++) {
742 usb_kill_urb(urbs[i]);
459c51ad 743 free_rx_urb(urbs[i]);
e85d0918
DD		 744 }
745 kfree(urbs);
746
747 spin_lock_irqsave(&rx->lock, flags);
748 rx->urbs = NULL;
749 rx->urbs_count = 0;
750 spin_unlock_irqrestore(&rx->lock, flags);
751}
752
459c51ad
DD		 753/**
754 * zd_usb_disable_tx - disable transmission
755 * @usb: the zd1211rw-private USB structure
756 *
757 * Frees all URBs in the free list and marks the transmission as disabled.
758 */
759void zd_usb_disable_tx(struct zd_usb *usb)
760{
761 struct zd_usb_tx *tx = &usb->tx;
762 unsigned long flags;
763 struct list_head *pos, *n;
764
765 spin_lock_irqsave(&tx->lock, flags);
766 list_for_each_safe(pos, n, &tx->free_urb_list) {
767 list_del(pos);
768 usb_free_urb(list_entry(pos, struct urb, urb_list));
769 }
770 tx->enabled = 0;
771 tx->submitted_urbs = 0;
772 /* The stopped state is ignored, relying on ieee80211_wake_queues()
773 * in a potentionally following zd_usb_enable_tx().
774 */
775 spin_unlock_irqrestore(&tx->lock, flags);
776}
777
778/**
779 * zd_usb_enable_tx - enables transmission
780 * @usb: a &struct zd_usb pointer
781 *
782 * This function enables transmission and prepares the &zd_usb_tx data
783 * structure.
784 */
785void zd_usb_enable_tx(struct zd_usb *usb)
786{
787 unsigned long flags;
788 struct zd_usb_tx *tx = &usb->tx;
789
790 spin_lock_irqsave(&tx->lock, flags);
791 tx->enabled = 1;
792 tx->submitted_urbs = 0;
793 ieee80211_wake_queues(zd_usb_to_hw(usb));
794 tx->stopped = 0;
795 spin_unlock_irqrestore(&tx->lock, flags);
796}
797
798/**
799 * alloc_tx_urb - provides an tx URB
800 * @usb: a &struct zd_usb pointer
801 *
802 * Allocates a new URB. If possible takes the urb from the free list in
803 * usb->tx.
804 */
805static struct urb *alloc_tx_urb(struct zd_usb *usb)
806{
807 struct zd_usb_tx *tx = &usb->tx;
808 unsigned long flags;
809 struct list_head *entry;
810 struct urb *urb;
811
812 spin_lock_irqsave(&tx->lock, flags);
813 if (list_empty(&tx->free_urb_list)) {
814 urb = usb_alloc_urb(0, GFP_ATOMIC);
815 goto out;
816 }
817 entry = tx->free_urb_list.next;
818 list_del(entry);
819 urb = list_entry(entry, struct urb, urb_list);
820out:
821 spin_unlock_irqrestore(&tx->lock, flags);
822 return urb;
823}
824
825/**
826 * free_tx_urb - frees a used tx URB
827 * @usb: a &struct zd_usb pointer
828 * @urb: URB to be freed
829 *
830 * Frees the the transmission URB, which means to put it on the free URB
831 * list.
832 */
833static void free_tx_urb(struct zd_usb *usb, struct urb *urb)
834{
835 struct zd_usb_tx *tx = &usb->tx;
836 unsigned long flags;
837
838 spin_lock_irqsave(&tx->lock, flags);
839 if (!tx->enabled) {
840 usb_free_urb(urb);
841 goto out;
842 }
843 list_add(&urb->urb_list, &tx->free_urb_list);
844out:
845 spin_unlock_irqrestore(&tx->lock, flags);
846}
847
848static void tx_dec_submitted_urbs(struct zd_usb *usb)
849{
850 struct zd_usb_tx *tx = &usb->tx;
851 unsigned long flags;
852
853 spin_lock_irqsave(&tx->lock, flags);
854 --tx->submitted_urbs;
855 if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
856 ieee80211_wake_queues(zd_usb_to_hw(usb));
857 tx->stopped = 0;
858 }
859 spin_unlock_irqrestore(&tx->lock, flags);
860}
861
862static void tx_inc_submitted_urbs(struct zd_usb *usb)
863{
864 struct zd_usb_tx *tx = &usb->tx;
865 unsigned long flags;
866
867 spin_lock_irqsave(&tx->lock, flags);
868 ++tx->submitted_urbs;
869 if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
870 ieee80211_stop_queues(zd_usb_to_hw(usb));
871 tx->stopped = 1;
872 }
873 spin_unlock_irqrestore(&tx->lock, flags);
874}
875
876/**
877 * tx_urb_complete - completes the execution of an URB
878 * @urb: a URB
879 *
880 * This function is called if the URB has been transferred to a device or an
881 * error has happened.
882 */
7d12e780 883static void tx_urb_complete(struct urb *urb)
e85d0918
DD		 884{
885 int r;
459c51ad 886 struct sk_buff *skb;
e039fa4a 887 struct ieee80211_tx_info *info;
459c51ad 888 struct zd_usb *usb;
e85d0918
DD		 889
890 switch (urb->status) {
891 case 0:
892 break;
893 case -ESHUTDOWN:
894 case -EINVAL:
895 case -ENODEV:
896 case -ENOENT:
897 case -ECONNRESET:
b312d799 898 case -EPIPE:
e85d0918
DD		 899 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
900 break;
e85d0918
DD		 901 default:
902 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
903 goto resubmit;
904 }
905free_urb:
459c51ad 906 skb = (struct sk_buff *)urb->context;
dbabad0c
JB		 907 /*
908 * grab 'usb' pointer before handing off the skb (since
909 * it might be freed by zd_mac_tx_to_dev or mac80211)
910 */
e039fa4a
JB		 911 info = IEEE80211_SKB_CB(skb);
912 usb = &zd_hw_mac(info->driver_data[0])->chip.usb;
dbabad0c 913 zd_mac_tx_to_dev(skb, urb->status);
459c51ad
DD		 914 free_tx_urb(usb, urb);
915 tx_dec_submitted_urbs(usb);
e85d0918
DD		 916 return;
917resubmit:
918 r = usb_submit_urb(urb, GFP_ATOMIC);
919 if (r) {
920 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
921 goto free_urb;
922 }
923}
924
459c51ad
DD		 925/**
926 * zd_usb_tx: initiates transfer of a frame of the device
927 *
928 * @usb: the zd1211rw-private USB structure
929 * @skb: a &struct sk_buff pointer
930 *
931 * This function tranmits a frame to the device. It doesn't wait for
932 * completion. The frame must contain the control set and have all the
933 * control set information available.
934 *
935 * The function returns 0 if the transfer has been successfully initiated.
e85d0918 936 */
459c51ad 937int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
e85d0918
DD		 938{
939 int r;
940 struct usb_device *udev = zd_usb_to_usbdev(usb);
941 struct urb *urb;
e85d0918 942
459c51ad 943 urb = alloc_tx_urb(usb);
e85d0918
DD		 944 if (!urb) {
945 r = -ENOMEM;
946 goto out;
947 }
948
e85d0918 949 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
459c51ad 950 skb->data, skb->len, tx_urb_complete, skb);
e85d0918
DD		 951
952 r = usb_submit_urb(urb, GFP_ATOMIC);
953 if (r)
954 goto error;
459c51ad 955 tx_inc_submitted_urbs(usb);
e85d0918
DD		 956 return 0;
957error:
459c51ad 958 free_tx_urb(usb, urb);
e85d0918
DD		 959out:
960 return r;
961}
962
963static inline void init_usb_interrupt(struct zd_usb *usb)
964{
965 struct zd_usb_interrupt *intr = &usb->intr;
966
967 spin_lock_init(&intr->lock);
968 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
969 init_completion(&intr->read_regs.completion);
0ce34bc8 970 intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
e85d0918
DD		 971}
972
973static inline void init_usb_rx(struct zd_usb *usb)
974{
975 struct zd_usb_rx *rx = &usb->rx;
976 spin_lock_init(&rx->lock);
977 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
978 rx->usb_packet_size = 512;
979 } else {
980 rx->usb_packet_size = 64;
981 }
982 ZD_ASSERT(rx->fragment_length == 0);
983}
984
985static inline void init_usb_tx(struct zd_usb *usb)
986{
459c51ad
DD		 987 struct zd_usb_tx *tx = &usb->tx;
988 spin_lock_init(&tx->lock);
989 tx->enabled = 0;
990 tx->stopped = 0;
991 INIT_LIST_HEAD(&tx->free_urb_list);
992 tx->submitted_urbs = 0;
e85d0918
DD		 993}
994
459c51ad 995void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
e85d0918
DD		 996 struct usb_interface *intf)
997{
998 memset(usb, 0, sizeof(*usb));
999 usb->intf = usb_get_intf(intf);
459c51ad 1000 usb_set_intfdata(usb->intf, hw);
e85d0918
DD		 1001 init_usb_interrupt(usb);
1002 init_usb_tx(usb);
1003 init_usb_rx(usb);
1004}
1005
e85d0918
DD		 1006void zd_usb_clear(struct zd_usb *usb)
1007{
1008 usb_set_intfdata(usb->intf, NULL);
1009 usb_put_intf(usb->intf);
c48cf125 1010 ZD_MEMCLEAR(usb, sizeof(*usb));
e85d0918
DD		 1011 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
1012}
1013
1014static const char *speed(enum usb_device_speed speed)
1015{
1016 switch (speed) {
1017 case USB_SPEED_LOW:
1018 return "low";
1019 case USB_SPEED_FULL:
1020 return "full";
1021 case USB_SPEED_HIGH:
1022 return "high";
1023 default:
1024 return "unknown speed";
1025 }
1026}
1027
1028static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1029{
1030 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1031 le16_to_cpu(udev->descriptor.idVendor),
1032 le16_to_cpu(udev->descriptor.idProduct),
1033 get_bcdDevice(udev),
1034 speed(udev->speed));
1035}
1036
1037int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1038{
1039 struct usb_device *udev = interface_to_usbdev(usb->intf);
1040 return scnprint_id(udev, buffer, size);
1041}
1042
1043#ifdef DEBUG
1044static void print_id(struct usb_device *udev)
1045{
1046 char buffer[40];
1047
1048 scnprint_id(udev, buffer, sizeof(buffer));
1049 buffer[sizeof(buffer)-1] = 0;
1050 dev_dbg_f(&udev->dev, "%s\n", buffer);
1051}
1052#else
1053#define print_id(udev) do { } while (0)
1054#endif
1055
a1030e92
DD		 1056static int eject_installer(struct usb_interface *intf)
1057{
1058 struct usb_device *udev = interface_to_usbdev(intf);
1059 struct usb_host_interface *iface_desc = &intf->altsetting[0];
1060 struct usb_endpoint_descriptor *endpoint;
1061 unsigned char *cmd;
1062 u8 bulk_out_ep;
1063 int r;
1064
1065 /* Find bulk out endpoint */
1066 endpoint = &iface_desc->endpoint[1].desc;
1067 if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
1068 (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
1069 USB_ENDPOINT_XFER_BULK) {
1070 bulk_out_ep = endpoint->bEndpointAddress;
1071 } else {
1072 dev_err(&udev->dev,
1073 "zd1211rw: Could not find bulk out endpoint\n");
1074 return -ENODEV;
1075 }
1076
1077 cmd = kzalloc(31, GFP_KERNEL);
1078 if (cmd == NULL)
1079 return -ENODEV;
1080
1081 /* USB bulk command block */
1082 cmd[0] = 0x55; /* bulk command signature */
1083 cmd[1] = 0x53; /* bulk command signature */
1084 cmd[2] = 0x42; /* bulk command signature */
1085 cmd[3] = 0x43; /* bulk command signature */
1086 cmd[14] = 6; /* command length */
1087
1088 cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1089 cmd[19] = 0x2; /* eject disc */
1090
1091 dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1092 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1093 cmd, 31, NULL, 2000);
1094 kfree(cmd);
1095 if (r)
1096 return r;
1097
1098 /* At this point, the device disconnects and reconnects with the real
1099 * ID numbers. */
1100
1101 usb_set_intfdata(intf, NULL);
1102 return 0;
1103}
1104
74553aed
DD		 1105int zd_usb_init_hw(struct zd_usb *usb)
1106{
1107 int r;
1108 struct zd_mac *mac = zd_usb_to_mac(usb);
1109
1110 dev_dbg_f(zd_usb_dev(usb), "\n");
1111
1112 r = upload_firmware(usb);
1113 if (r) {
1114 dev_err(zd_usb_dev(usb),
1115 "couldn't load firmware. Error number %d\n", r);
1116 return r;
1117 }
1118
1119 r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1120 if (r) {
1121 dev_dbg_f(zd_usb_dev(usb),
1122 "couldn't reset configuration. Error number %d\n", r);
1123 return r;
1124 }
1125
459c51ad 1126 r = zd_mac_init_hw(mac->hw);
74553aed
DD		 1127 if (r) {
1128 dev_dbg_f(zd_usb_dev(usb),
1129 "couldn't initialize mac. Error number %d\n", r);
1130 return r;
1131 }
1132
1133 usb->initialized = 1;
1134 return 0;
1135}
1136
e85d0918
DD		 1137static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1138{
1139 int r;
1140 struct usb_device *udev = interface_to_usbdev(intf);
459c51ad
DD		 1141 struct zd_usb *usb;
1142 struct ieee80211_hw *hw = NULL;
e85d0918
DD		 1143
1144 print_id(udev);
1145
a1030e92
DD		 1146 if (id->driver_info & DEVICE_INSTALLER)
1147 return eject_installer(intf);
1148
e85d0918
DD		 1149 switch (udev->speed) {
1150 case USB_SPEED_LOW:
1151 case USB_SPEED_FULL:
1152 case USB_SPEED_HIGH:
1153 break;
1154 default:
1155 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1156 r = -ENODEV;
1157 goto error;
1158 }
1159
459c51ad
DD		 1160 r = usb_reset_device(udev);
1161 if (r) {
1162 dev_err(&intf->dev,
1163 "couldn't reset usb device. Error number %d\n", r);
1164 goto error;
1165 }
6e3632f6 1166
459c51ad
DD		 1167 hw = zd_mac_alloc_hw(intf);
1168 if (hw == NULL) {
e85d0918
DD		 1169 r = -ENOMEM;
1170 goto error;
1171 }
1172
459c51ad 1173 usb = &zd_hw_mac(hw)->chip.usb;
74553aed 1174 usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
e85d0918 1175
459c51ad 1176 r = zd_mac_preinit_hw(hw);
e85d0918
DD		 1177 if (r) {
1178 dev_dbg_f(&intf->dev,
1179 "couldn't initialize mac. Error number %d\n", r);
1180 goto error;
1181 }
1182
459c51ad 1183 r = ieee80211_register_hw(hw);
e85d0918
DD		 1184 if (r) {
1185 dev_dbg_f(&intf->dev,
459c51ad 1186 "couldn't register device. Error number %d\n", r);
e85d0918
DD		 1187 goto error;
1188 }
1189
1190 dev_dbg_f(&intf->dev, "successful\n");
459c51ad 1191 dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
e85d0918
DD		 1192 return 0;
1193error:
1194 usb_reset_device(interface_to_usbdev(intf));
459c51ad
DD		 1195 if (hw) {
1196 zd_mac_clear(zd_hw_mac(hw));
1197 ieee80211_free_hw(hw);
1198 }
e85d0918
DD		 1199 return r;
1200}
1201
1202static void disconnect(struct usb_interface *intf)
1203{
459c51ad 1204 struct ieee80211_hw *hw = zd_intf_to_hw(intf);
e0579d57
MP		 1205 struct zd_mac *mac;
1206 struct zd_usb *usb;
e85d0918 1207
a1030e92
DD		 1208 /* Either something really bad happened, or we're just dealing with
1209 * a DEVICE_INSTALLER. */
459c51ad 1210 if (hw == NULL)
a1030e92
DD		 1211 return;
1212
459c51ad 1213 mac = zd_hw_mac(hw);
e0579d57
MP		 1214 usb = &mac->chip.usb;
1215
e85d0918
DD		 1216 dev_dbg_f(zd_usb_dev(usb), "\n");
1217
459c51ad 1218 ieee80211_unregister_hw(hw);
e85d0918
DD		 1219
1220 /* Just in case something has gone wrong! */
1221 zd_usb_disable_rx(usb);
1222 zd_usb_disable_int(usb);
1223
1224 /* If the disconnect has been caused by a removal of the
1225 * driver module, the reset allows reloading of the driver. If the
1226 * reset will not be executed here, the upload of the firmware in the
1227 * probe function caused by the reloading of the driver will fail.
1228 */
1229 usb_reset_device(interface_to_usbdev(intf));
1230
459c51ad
DD		 1231 zd_mac_clear(mac);
1232 ieee80211_free_hw(hw);
e85d0918
DD		 1233 dev_dbg(&intf->dev, "disconnected\n");
1234}
1235
1236static struct usb_driver driver = {
459c51ad 1237 .name = KBUILD_MODNAME,
e85d0918
DD		 1238 .id_table = usb_ids,
1239 .probe = probe,
1240 .disconnect = disconnect,
1241};
1242
bc5f06a8
UK		 1243struct workqueue_struct *zd_workqueue;
1244
e85d0918
DD		 1245static int __init usb_init(void)
1246{
1247 int r;
1248
741fec53 1249 pr_debug("%s usb_init()\n", driver.name);
e85d0918 1250
bc5f06a8
UK		 1251 zd_workqueue = create_singlethread_workqueue(driver.name);
1252 if (zd_workqueue == NULL) {
741fec53 1253 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
bc5f06a8
UK		 1254 return -ENOMEM;
1255 }
1256
e85d0918
DD		 1257 r = usb_register(&driver);
1258 if (r) {
192b775c 1259 destroy_workqueue(zd_workqueue);
741fec53
UK		 1260 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1261 driver.name, r);
e85d0918
DD		 1262 return r;
1263 }
1264
741fec53 1265 pr_debug("%s initialized\n", driver.name);
e85d0918
DD		 1266 return 0;
1267}
1268
1269static void __exit usb_exit(void)
1270{
741fec53 1271 pr_debug("%s usb_exit()\n", driver.name);
e85d0918 1272 usb_deregister(&driver);
bc5f06a8 1273 destroy_workqueue(zd_workqueue);
e85d0918
DD		 1274}
1275
1276module_init(usb_init);
1277module_exit(usb_exit);
1278
1279static int usb_int_regs_length(unsigned int count)
1280{
1281 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1282}
1283
1284static void prepare_read_regs_int(struct zd_usb *usb)
1285{
1286 struct zd_usb_interrupt *intr = &usb->intr;
1287
a68077de 1288 spin_lock_irq(&intr->lock);
e85d0918
DD		 1289 intr->read_regs_enabled = 1;
1290 INIT_COMPLETION(intr->read_regs.completion);
a68077de
UK		 1291 spin_unlock_irq(&intr->lock);
1292}
1293
1294static void disable_read_regs_int(struct zd_usb *usb)
1295{
1296 struct zd_usb_interrupt *intr = &usb->intr;
1297
1298 spin_lock_irq(&intr->lock);
1299 intr->read_regs_enabled = 0;
1300 spin_unlock_irq(&intr->lock);
e85d0918
DD		 1301}
1302
1303static int get_results(struct zd_usb *usb, u16 *values,
1304 struct usb_req_read_regs *req, unsigned int count)
1305{
1306 int r;
1307 int i;
1308 struct zd_usb_interrupt *intr = &usb->intr;
1309 struct read_regs_int *rr = &intr->read_regs;
1310 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1311
a68077de 1312 spin_lock_irq(&intr->lock);
e85d0918
DD		 1313
1314 r = -EIO;
1315 /* The created block size seems to be larger than expected.
1316 * However results appear to be correct.
1317 */
1318 if (rr->length < usb_int_regs_length(count)) {
1319 dev_dbg_f(zd_usb_dev(usb),
1320 "error: actual length %d less than expected %d\n",
1321 rr->length, usb_int_regs_length(count));
1322 goto error_unlock;
1323 }
1324 if (rr->length > sizeof(rr->buffer)) {
1325 dev_dbg_f(zd_usb_dev(usb),
1326 "error: actual length %d exceeds buffer size %zu\n",
1327 rr->length, sizeof(rr->buffer));
1328 goto error_unlock;
1329 }
1330
1331 for (i = 0; i < count; i++) {
1332 struct reg_data *rd = &regs->regs[i];
1333 if (rd->addr != req->addr[i]) {
1334 dev_dbg_f(zd_usb_dev(usb),
1335 "rd[%d] addr %#06hx expected %#06hx\n", i,
1336 le16_to_cpu(rd->addr),
1337 le16_to_cpu(req->addr[i]));
1338 goto error_unlock;
1339 }
1340 values[i] = le16_to_cpu(rd->value);
1341 }
1342
1343 r = 0;
1344error_unlock:
a68077de 1345 spin_unlock_irq(&intr->lock);
e85d0918
DD		 1346 return r;
1347}
1348
1349int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1350 const zd_addr_t *addresses, unsigned int count)
1351{
1352 int r;
1353 int i, req_len, actual_req_len;
1354 struct usb_device *udev;
1355 struct usb_req_read_regs *req = NULL;
1356 unsigned long timeout;
1357
1358 if (count < 1) {
1359 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1360 return -EINVAL;
1361 }
1362 if (count > USB_MAX_IOREAD16_COUNT) {
1363 dev_dbg_f(zd_usb_dev(usb),
1364 "error: count %u exceeds possible max %u\n",
1365 count, USB_MAX_IOREAD16_COUNT);
1366 return -EINVAL;
1367 }
1368 if (in_atomic()) {
1369 dev_dbg_f(zd_usb_dev(usb),
1370 "error: io in atomic context not supported\n");
1371 return -EWOULDBLOCK;
1372 }
1373 if (!usb_int_enabled(usb)) {
1374 dev_dbg_f(zd_usb_dev(usb),
1375 "error: usb interrupt not enabled\n");
1376 return -EWOULDBLOCK;
1377 }
1378
1379 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
35c3404e 1380 req = kmalloc(req_len, GFP_KERNEL);
e85d0918
DD		 1381 if (!req)
1382 return -ENOMEM;
1383 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1384 for (i = 0; i < count; i++)
0ce34bc8 1385 req->addr[i] = cpu_to_le16((u16)addresses[i]);
e85d0918
DD		 1386
1387 udev = zd_usb_to_usbdev(usb);
1388 prepare_read_regs_int(usb);
1389 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1390 req, req_len, &actual_req_len, 1000 /* ms */);
1391 if (r) {
1392 dev_dbg_f(zd_usb_dev(usb),
1393 "error in usb_bulk_msg(). Error number %d\n", r);
1394 goto error;
1395 }
1396 if (req_len != actual_req_len) {
1397 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1398 " req_len %d != actual_req_len %d\n",
1399 req_len, actual_req_len);
1400 r = -EIO;
1401 goto error;
1402 }
1403
1404 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1405 msecs_to_jiffies(1000));
1406 if (!timeout) {
1407 disable_read_regs_int(usb);
1408 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1409 r = -ETIMEDOUT;
1410 goto error;
1411 }
1412
1413 r = get_results(usb, values, req, count);
1414error:
1415 kfree(req);
1416 return r;
1417}
1418
1419int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1420 unsigned int count)
1421{
1422 int r;
1423 struct usb_device *udev;
1424 struct usb_req_write_regs *req = NULL;
1425 int i, req_len, actual_req_len;
1426
1427 if (count == 0)
1428 return 0;
1429 if (count > USB_MAX_IOWRITE16_COUNT) {
1430 dev_dbg_f(zd_usb_dev(usb),
1431 "error: count %u exceeds possible max %u\n",
1432 count, USB_MAX_IOWRITE16_COUNT);
1433 return -EINVAL;
1434 }
1435 if (in_atomic()) {
1436 dev_dbg_f(zd_usb_dev(usb),
1437 "error: io in atomic context not supported\n");
1438 return -EWOULDBLOCK;
1439 }
1440
1441 req_len = sizeof(struct usb_req_write_regs) +
1442 count * sizeof(struct reg_data);
35c3404e 1443 req = kmalloc(req_len, GFP_KERNEL);
e85d0918
DD		 1444 if (!req)
1445 return -ENOMEM;
1446
1447 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1448 for (i = 0; i < count; i++) {
1449 struct reg_data *rw = &req->reg_writes[i];
0ce34bc8 1450 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
e85d0918
DD		 1451 rw->value = cpu_to_le16(ioreqs[i].value);
1452 }
1453
1454 udev = zd_usb_to_usbdev(usb);
1455 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1456 req, req_len, &actual_req_len, 1000 /* ms */);
1457 if (r) {
1458 dev_dbg_f(zd_usb_dev(usb),
1459 "error in usb_bulk_msg(). Error number %d\n", r);
1460 goto error;
1461 }
1462 if (req_len != actual_req_len) {
1463 dev_dbg_f(zd_usb_dev(usb),
1464 "error in usb_bulk_msg()"
1465 " req_len %d != actual_req_len %d\n",
1466 req_len, actual_req_len);
1467 r = -EIO;
1468 goto error;
1469 }
1470
1471 /* FALL-THROUGH with r == 0 */
1472error:
1473 kfree(req);
1474 return r;
1475}
1476
1477int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1478{
1479 int r;
1480 struct usb_device *udev;
1481 struct usb_req_rfwrite *req = NULL;
1482 int i, req_len, actual_req_len;
1483 u16 bit_value_template;
1484
1485 if (in_atomic()) {
1486 dev_dbg_f(zd_usb_dev(usb),
1487 "error: io in atomic context not supported\n");
1488 return -EWOULDBLOCK;
1489 }
1490 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1491 dev_dbg_f(zd_usb_dev(usb),
1492 "error: bits %d are smaller than"
1493 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1494 bits, USB_MIN_RFWRITE_BIT_COUNT);
1495 return -EINVAL;
1496 }
1497 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1498 dev_dbg_f(zd_usb_dev(usb),
1499 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1500 bits, USB_MAX_RFWRITE_BIT_COUNT);
1501 return -EINVAL;
1502 }
1503#ifdef DEBUG
1504 if (value & (~0UL << bits)) {
1505 dev_dbg_f(zd_usb_dev(usb),
1506 "error: value %#09x has bits >= %d set\n",
1507 value, bits);
1508 return -EINVAL;
1509 }
1510#endif /* DEBUG */
1511
1512 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1513
1514 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1515 if (r) {
1516 dev_dbg_f(zd_usb_dev(usb),
1517 "error %d: Couldn't read CR203\n", r);
1518 goto out;
1519 }
1520 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1521
1522 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
35c3404e 1523 req = kmalloc(req_len, GFP_KERNEL);
e85d0918
DD		 1524 if (!req)
1525 return -ENOMEM;
1526
1527 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1528 /* 1: 3683a, but not used in ZYDAS driver */
1529 req->value = cpu_to_le16(2);
1530 req->bits = cpu_to_le16(bits);
1531
1532 for (i = 0; i < bits; i++) {
1533 u16 bv = bit_value_template;
1534 if (value & (1 << (bits-1-i)))
1535 bv |= RF_DATA;
1536 req->bit_values[i] = cpu_to_le16(bv);
1537 }
1538
1539 udev = zd_usb_to_usbdev(usb);
1540 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1541 req, req_len, &actual_req_len, 1000 /* ms */);
1542 if (r) {
1543 dev_dbg_f(zd_usb_dev(usb),
1544 "error in usb_bulk_msg(). Error number %d\n", r);
1545 goto out;
1546 }
1547 if (req_len != actual_req_len) {
1548 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1549 " req_len %d != actual_req_len %d\n",
1550 req_len, actual_req_len);
1551 r = -EIO;
1552 goto out;
1553 }
1554
1555 /* FALL-THROUGH with r == 0 */
1556out:
1557 kfree(req);
1558 return r;
1559}
Linux 6.x block layer and io_uring tree(s)