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zd1211rw: use async urb for write command
[deliverable/linux.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>
5a0e3ad6 27#include <linux/slab.h>
e85d0918
DD		 28#include <linux/skbuff.h>
29#include <linux/usb.h>
bc5f06a8 30#include <linux/workqueue.h>
459c51ad 31#include <net/mac80211.h>
c248725b 32#include <asm/unaligned.h>
e85d0918
DD		 33
34#include "zd_def.h"
e85d0918
DD		 35#include "zd_mac.h"
36#include "zd_usb.h"
e85d0918
DD		 37
38static struct usb_device_id usb_ids[] = {
39 /* ZD1211 */
3bfbe80e
HTL		 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 },
e85d0918 47 { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
14990c69 48 { USB_DEVICE(0x0ace, 0xa211), .driver_info = DEVICE_ZD1211 },
3bfbe80e
HTL		 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 },
e85d0918 52 { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
aa1d3a18 53 { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
3bfbe80e
HTL		 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 },
f2423723 57 { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
8cecc90e 58 { USB_DEVICE(0x14ea, 0xab10), .driver_info = DEVICE_ZD1211 },
229782a3 59 { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
269fca0e 60 { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
3bfbe80e
HTL		 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 },
e85d0918 65 /* ZD1211B */
3bfbe80e 66 { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
ad580db5 67 { USB_DEVICE(0x0409, 0x0248), .driver_info = DEVICE_ZD1211B },
3bfbe80e
HTL		 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 },
8b339d05 72 { USB_DEVICE(0x054c, 0x0257), .driver_info = DEVICE_ZD1211B },
3bfbe80e
HTL		 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 },
dd2f5538 78 { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
3bfbe80e
HTL		 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 },
8f75e07a 82 { USB_DEVICE(0x083a, 0xe501), .driver_info = DEVICE_ZD1211B },
f72151fb 83 { USB_DEVICE(0x083a, 0xe503), .driver_info = DEVICE_ZD1211B },
9dfd5500 84 { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
3bfbe80e
HTL		 85 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
86 { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B },
aec91028 87 { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
c445a31c 88 { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
8e97afe5 89 { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
de262496 90 { USB_DEVICE(0x0df6, 0x0036), .driver_info = DEVICE_ZD1211B },
3bfbe80e
HTL		 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 },
8cecc90e 96 { USB_DEVICE(0x2019, 0xed01), .driver_info = DEVICE_ZD1211B },
a1030e92
DD		 97 /* "Driverless" devices that need ejecting */
98 { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
aa1d3a18 99 { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
e85d0918
DD		 100 {}
101};
102
103MODULE_LICENSE("GPL");
104MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
105MODULE_AUTHOR("Ulrich Kunitz");
106MODULE_AUTHOR("Daniel Drake");
107MODULE_VERSION("1.0");
108MODULE_DEVICE_TABLE(usb, usb_ids);
109
110#define FW_ZD1211_PREFIX "zd1211/zd1211_"
111#define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
112
e85d0918 113/* USB device initialization */
72e77a8a 114static void int_urb_complete(struct urb *urb);
e85d0918
DD		 115
116static 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
131static inline u16 get_bcdDevice(const struct usb_device *udev)
132{
133 return le16_to_cpu(udev->descriptor.bcdDevice);
134}
135
136enum 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
143static 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
a8c4ea7a 186 /* Use "DMA-aware" buffer. */
e85d0918
DD		 187 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
188 USB_REQ_FIRMWARE_CONFIRM,
189 USB_DIR_IN | USB_TYPE_VENDOR,
a8c4ea7a 190 0, 0, p, sizeof(ret), 5000 /* ms */);
e85d0918
DD		 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 }
a8c4ea7a 199 ret = p[0];
e85d0918
DD		 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;
213error:
214 kfree(p);
215 return r;
216}
217
218static u16 get_word(const void *data, u16 offset)
219{
220 const __le16 *p = data;
221 return le16_to_cpu(p[offset]);
222}
223
74553aed 224static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
e85d0918
DD		 225 const char* postfix)
226{
227 scnprintf(buffer, size, "%s%s",
74553aed 228 usb->is_zd1211b ?
e85d0918
DD		 229 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
230 postfix);
231 return buffer;
232}
233
74553aed 234static int handle_version_mismatch(struct zd_usb *usb,
d066c219
DD		 235 const struct firmware *ub_fw)
236{
74553aed 237 struct usb_device *udev = zd_usb_to_usbdev(usb);
d066c219
DD		 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,
74553aed 244 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
d066c219
DD		 245 &udev->dev);
246 if (r)
247 goto error;
248
ee302767 249 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
d066c219
DD		 250 if (r)
251 goto error;
252
ee302767 253 offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
d066c219 254 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
ee302767 255 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
d066c219
DD		 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. */
262error:
263 release_firmware(ur_fw);
264 return r;
265}
266
74553aed 267static int upload_firmware(struct zd_usb *usb)
e85d0918
DD		 268{
269 int r;
270 u16 fw_bcdDevice;
271 u16 bcdDevice;
74553aed 272 struct usb_device *udev = zd_usb_to_usbdev(usb);
e85d0918
DD		 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,
74553aed 280 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
e85d0918
DD		 281 &udev->dev);
282 if (r)
283 goto error;
284
ee302767 285 fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
e85d0918 286
e85d0918
DD		 287 if (fw_bcdDevice != bcdDevice) {
288 dev_info(&udev->dev,
d066c219
DD		 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
74553aed 295 r = handle_version_mismatch(usb, ub_fw);
d066c219
DD		 296 if (r)
297 goto error;
e85d0918
DD		 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,
74553aed 306 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
e85d0918
DD		 307 &udev->dev);
308 if (r)
309 goto error;
310
ee302767 311 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
e85d0918
DD		 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 */
319error:
320 release_firmware(ub_fw);
321 release_firmware(uph_fw);
322 return r;
323}
324
3e8b4d00
BH		 325MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ur");
326MODULE_FIRMWARE(FW_ZD1211_PREFIX "ur");
327MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ub");
328MODULE_FIRMWARE(FW_ZD1211_PREFIX "ub");
329MODULE_FIRMWARE(FW_ZD1211B_PREFIX "uphr");
330MODULE_FIRMWARE(FW_ZD1211_PREFIX "uphr");
331
74553aed
DD		 332/* Read data from device address space using "firmware interface" which does
333 * not require firmware to be loaded. */
334int 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);
a8c4ea7a 338 u8 *buf;
74553aed 339
a8c4ea7a
AN		 340 /* Use "DMA-aware" buffer. */
341 buf = kmalloc(len, GFP_KERNEL);
342 if (!buf)
343 return -ENOMEM;
74553aed
DD		 344 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
345 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
a8c4ea7a 346 buf, len, 5000);
74553aed
DD		 347 if (r < 0) {
348 dev_err(&udev->dev,
349 "read over firmware interface failed: %d\n", r);
a8c4ea7a 350 goto exit;
74553aed
DD		 351 } else if (r != len) {
352 dev_err(&udev->dev,
353 "incomplete read over firmware interface: %d/%d\n",
354 r, len);
a8c4ea7a
AN		 355 r = -EIO;
356 goto exit;
74553aed 357 }
a8c4ea7a
AN		 358 r = 0;
359 memcpy(data, buf, len);
360exit:
361 kfree(buf);
362 return r;
74553aed
DD		 363}
364
e85d0918
DD		 365#define urb_dev(urb) (&(urb)->dev->dev)
366
367static 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;
72e77a8a 372 u16 int_num;
e85d0918
DD		 373
374 ZD_ASSERT(in_interrupt());
375 spin_lock(&intr->lock);
376
d63ddcec 377 int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
72e77a8a
LCC		 378 if (int_num == CR_INTERRUPT) {
379 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
8b17f75c 380 spin_lock(&mac->lock);
72e77a8a
LCC		 381 memcpy(&mac->intr_buffer, urb->transfer_buffer,
382 USB_MAX_EP_INT_BUFFER);
8b17f75c 383 spin_unlock(&mac->lock);
72e77a8a
LCC		 384 schedule_work(&mac->process_intr);
385 } else if (intr->read_regs_enabled) {
e85d0918
DD		 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
e85d0918
DD		 396out:
397 spin_unlock(&intr->lock);
398}
399
7d12e780 400static void int_urb_complete(struct urb *urb)
e85d0918
DD		 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:
e85d0918 413 case -EPIPE:
24d24c62 414 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
4a3b0874 415 return;
e85d0918 416 default:
24d24c62 417 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
e85d0918
DD		 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:
7f4013f0 437 zd_mac_tx_failed(urb);
e85d0918
DD		 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
445resubmit:
446 r = usb_submit_urb(urb, GFP_ATOMIC);
447 if (r) {
4a3b0874
JK		 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 */
e85d0918
DD		 451 }
452 return;
e85d0918
DD		 453}
454
455static 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
468static 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
480int zd_usb_enable_int(struct zd_usb *usb)
481{
482 int r;
4a3b0874 483 struct usb_device *udev = zd_usb_to_usbdev(usb);
e85d0918 484 struct zd_usb_interrupt *intr = &usb->intr;
e85d0918
DD		 485 struct urb *urb;
486
487 dev_dbg_f(zd_usb_dev(usb), "\n");
488
35c3404e 489 urb = usb_alloc_urb(0, GFP_KERNEL);
e85d0918
DD		 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
e85d0918 505 r = -ENOMEM;
4a3b0874
JK		 506 intr->buffer = usb_alloc_coherent(udev, USB_MAX_EP_INT_BUFFER,
507 GFP_KERNEL, &intr->buffer_dma);
508 if (!intr->buffer) {
e85d0918
DD		 509 dev_dbg_f(zd_usb_dev(usb),
510 "couldn't allocate transfer_buffer\n");
511 goto error_set_urb_null;
512 }
513
e85d0918 514 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
4a3b0874 515 intr->buffer, USB_MAX_EP_INT_BUFFER,
e85d0918
DD		 516 int_urb_complete, usb,
517 intr->interval);
4a3b0874
JK		 518 urb->transfer_dma = intr->buffer_dma;
519 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
e85d0918
DD		 520
521 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
35c3404e 522 r = usb_submit_urb(urb, GFP_KERNEL);
e85d0918
DD		 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;
530error:
4a3b0874
JK		 531 usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER,
532 intr->buffer, intr->buffer_dma);
e85d0918
DD		 533error_set_urb_null:
534 spin_lock_irq(&intr->lock);
535 intr->urb = NULL;
536 spin_unlock_irq(&intr->lock);
537error_free_urb:
538 usb_free_urb(urb);
539out:
540 return r;
541}
542
543void zd_usb_disable_int(struct zd_usb *usb)
544{
545 unsigned long flags;
4a3b0874 546 struct usb_device *udev = zd_usb_to_usbdev(usb);
e85d0918
DD		 547 struct zd_usb_interrupt *intr = &usb->intr;
548 struct urb *urb;
4a3b0874
JK		 549 void *buffer;
550 dma_addr_t buffer_dma;
e85d0918
DD		 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;
4a3b0874
JK		 559 buffer = intr->buffer;
560 buffer_dma = intr->buffer_dma;
561 intr->buffer = NULL;
e85d0918
DD		 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);
4a3b0874
JK		 567
568 if (buffer)
569 usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER,
570 buffer, buffer_dma);
e85d0918
DD		 571}
572
573static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
574 unsigned int length)
575{
576 int i;
e85d0918
DD		 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. */
7f4013f0
BP		 581 printk("%s: invalid, small RX packet : %d\n",
582 __func__, length);
e85d0918
DD		 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 */
533dd1b0 596 if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
b269825b 597 {
e85d0918
DD		 598 unsigned int l, k, n;
599 for (i = 0, l = 0;; i++) {
533dd1b0 600 k = get_unaligned_le16(&length_info->length[i]);
850c211c
UK		 601 if (k == 0)
602 return;
e85d0918
DD		 603 n = l+k;
604 if (n > length)
605 return;
459c51ad 606 zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
e85d0918
DD		 607 if (i >= 2)
608 return;
609 l = (n+3) & ~3;
610 }
611 } else {
459c51ad 612 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
e85d0918
DD		 613 }
614}
615
7d12e780 616static void rx_urb_complete(struct urb *urb)
e85d0918 617{
24d24c62 618 int r;
e85d0918
DD		 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:
e85d0918 632 case -EPIPE:
24d24c62 633 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
b312d799 634 return;
e85d0918
DD		 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
1f6ccccc
JK		 645 zd_usb_reset_rx_idle_timer(usb);
646
e85d0918
DD		 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
674resubmit:
24d24c62
JK		 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);
e85d0918
DD		 678}
679
459c51ad 680static struct urb *alloc_rx_urb(struct zd_usb *usb)
e85d0918
DD		 681{
682 struct usb_device *udev = zd_usb_to_usbdev(usb);
683 struct urb *urb;
684 void *buffer;
685
35c3404e 686 urb = usb_alloc_urb(0, GFP_KERNEL);
e85d0918
DD		 687 if (!urb)
688 return NULL;
997ea58e
DM		 689 buffer = usb_alloc_coherent(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
690 &urb->transfer_dma);
e85d0918
DD		 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),
997ea58e 697 buffer, USB_MAX_RX_SIZE,
e85d0918
DD		 698 rx_urb_complete, usb);
699 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
700
701 return urb;
702}
703
459c51ad 704static void free_rx_urb(struct urb *urb)
e85d0918
DD		 705{
706 if (!urb)
707 return;
997ea58e
DM		 708 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
709 urb->transfer_buffer, urb->transfer_dma);
e85d0918
DD		 710 usb_free_urb(urb);
711}
712
1f6ccccc 713static int __zd_usb_enable_rx(struct zd_usb *usb)
e85d0918
DD		 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;
459c51ad 722 urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
e85d0918
DD		 723 if (!urbs)
724 goto error;
459c51ad
DD		 725 for (i = 0; i < RX_URBS_COUNT; i++) {
726 urbs[i] = alloc_rx_urb(usb);
e85d0918
DD		 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;
459c51ad 739 rx->urbs_count = RX_URBS_COUNT;
e85d0918
DD		 740 spin_unlock_irq(&rx->lock);
741
459c51ad 742 for (i = 0; i < RX_URBS_COUNT; i++) {
35c3404e 743 r = usb_submit_urb(urbs[i], GFP_KERNEL);
e85d0918
DD		 744 if (r)
745 goto error_submit;
746 }
747
748 return 0;
749error_submit:
459c51ad 750 for (i = 0; i < RX_URBS_COUNT; i++) {
e85d0918
DD		 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);
757error:
758 if (urbs) {
459c51ad
DD		 759 for (i = 0; i < RX_URBS_COUNT; i++)
760 free_rx_urb(urbs[i]);
e85d0918
DD		 761 }
762 return r;
763}
764
1f6ccccc
JK		 765int 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
779static void __zd_usb_disable_rx(struct zd_usb *usb)
e85d0918
DD		 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]);
459c51ad 796 free_rx_urb(urbs[i]);
e85d0918
DD		 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
1f6ccccc
JK		 806void 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
817static 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
459c51ad
DD		 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 */
846void zd_usb_disable_tx(struct zd_usb *usb)
847{
848 struct zd_usb_tx *tx = &usb->tx;
849 unsigned long flags;
78fc800f
JK		 850
851 atomic_set(&tx->enabled, 0);
852
853 /* kill all submitted tx-urbs */
854 usb_kill_anchored_urbs(&tx->submitted);
459c51ad
DD		 855
856 spin_lock_irqsave(&tx->lock, flags);
a0fd751f 857 WARN_ON(!skb_queue_empty(&tx->submitted_skbs));
78fc800f 858 WARN_ON(tx->submitted_urbs != 0);
459c51ad 859 tx->submitted_urbs = 0;
78fc800f
JK		 860 spin_unlock_irqrestore(&tx->lock, flags);
861
459c51ad
DD		 862 /* The stopped state is ignored, relying on ieee80211_wake_queues()
863 * in a potentionally following zd_usb_enable_tx().
864 */
459c51ad
DD		 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 */
874void 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);
78fc800f 880 atomic_set(&tx->enabled, 1);
459c51ad
DD		 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
459c51ad
DD		 887static 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
901static 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 */
7d12e780 922static void tx_urb_complete(struct urb *urb)
e85d0918
DD		 923{
924 int r;
459c51ad 925 struct sk_buff *skb;
e039fa4a 926 struct ieee80211_tx_info *info;
459c51ad 927 struct zd_usb *usb;
78fc800f
JK		 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;
e85d0918
DD		 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:
b312d799 947 case -EPIPE:
e85d0918
DD		 948 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
949 break;
e85d0918
DD		 950 default:
951 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
952 goto resubmit;
953 }
954free_urb:
a0fd751f 955 skb_unlink(skb, &usb->tx.submitted_skbs);
dbabad0c 956 zd_mac_tx_to_dev(skb, urb->status);
78fc800f 957 usb_free_urb(urb);
459c51ad 958 tx_dec_submitted_urbs(usb);
e85d0918
DD		 959 return;
960resubmit:
78fc800f 961 usb_anchor_urb(urb, &tx->submitted);
e85d0918
DD		 962 r = usb_submit_urb(urb, GFP_ATOMIC);
963 if (r) {
78fc800f 964 usb_unanchor_urb(urb);
e85d0918
DD		 965 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
966 goto free_urb;
967 }
968}
969
459c51ad
DD		 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.
e85d0918 981 */
459c51ad 982int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
e85d0918
DD		 983{
984 int r;
a0fd751f 985 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e85d0918
DD		 986 struct usb_device *udev = zd_usb_to_usbdev(usb);
987 struct urb *urb;
78fc800f 988 struct zd_usb_tx *tx = &usb->tx;
e85d0918 989
78fc800f
JK		 990 if (!atomic_read(&tx->enabled)) {
991 r = -ENOENT;
992 goto out;
993 }
994
995 urb = usb_alloc_urb(0, GFP_ATOMIC);
e85d0918
DD		 996 if (!urb) {
997 r = -ENOMEM;
998 goto out;
999 }
1000
e85d0918 1001 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
459c51ad 1002 skb->data, skb->len, tx_urb_complete, skb);
e85d0918 1003
a0fd751f
JK		 1004 info->rate_driver_data[1] = (void *)jiffies;
1005 skb_queue_tail(&tx->submitted_skbs, skb);
78fc800f 1006 usb_anchor_urb(urb, &tx->submitted);
a0fd751f 1007
e85d0918 1008 r = usb_submit_urb(urb, GFP_ATOMIC);
78fc800f 1009 if (r) {
24d24c62 1010 dev_dbg_f(zd_usb_dev(usb), "error submit urb %p %d\n", urb, r);
78fc800f 1011 usb_unanchor_urb(urb);
a0fd751f 1012 skb_unlink(skb, &tx->submitted_skbs);
e85d0918 1013 goto error;
78fc800f 1014 }
459c51ad 1015 tx_inc_submitted_urbs(usb);
e85d0918
DD		 1016 return 0;
1017error:
78fc800f 1018 usb_free_urb(urb);
e85d0918
DD		 1019out:
1020 return r;
1021}
1022
a0fd751f
JK		 1023static 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
1047static 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;
1065out:
1066 queue_delayed_work(zd_workqueue, &tx->watchdog_work,
1067 ZD_TX_WATCHDOG_INTERVAL);
1068}
1069
1070void 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
1082void 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
1f6ccccc
JK		 1093static 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
1108void 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
e85d0918
DD		 1116static 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);
0ce34bc8 1123 intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
e85d0918
DD		 1124}
1125
1126static inline void init_usb_rx(struct zd_usb *usb)
1127{
1128 struct zd_usb_rx *rx = &usb->rx;
1129 spin_lock_init(&rx->lock);
1f6ccccc 1130 mutex_init(&rx->setup_mutex);
e85d0918
DD		 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);
1f6ccccc 1137 INIT_DELAYED_WORK(&rx->idle_work, zd_rx_idle_timer_handler);
e85d0918
DD		 1138}
1139
1140static inline void init_usb_tx(struct zd_usb *usb)
1141{
459c51ad
DD		 1142 struct zd_usb_tx *tx = &usb->tx;
1143 spin_lock_init(&tx->lock);
78fc800f 1144 atomic_set(&tx->enabled, 0);
459c51ad 1145 tx->stopped = 0;
a0fd751f 1146 skb_queue_head_init(&tx->submitted_skbs);
78fc800f 1147 init_usb_anchor(&tx->submitted);
459c51ad 1148 tx->submitted_urbs = 0;
a0fd751f
JK		 1149 tx->watchdog_enabled = 0;
1150 INIT_DELAYED_WORK(&tx->watchdog_work, zd_tx_watchdog_handler);
e85d0918
DD		 1151}
1152
459c51ad 1153void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
e85d0918
DD		 1154 struct usb_interface *intf)
1155{
1156 memset(usb, 0, sizeof(*usb));
1157 usb->intf = usb_get_intf(intf);
459c51ad 1158 usb_set_intfdata(usb->intf, hw);
eefdbec1 1159 init_usb_anchor(&usb->submitted_cmds);
e85d0918
DD		 1160 init_usb_interrupt(usb);
1161 init_usb_tx(usb);
1162 init_usb_rx(usb);
1163}
1164
e85d0918
DD		 1165void zd_usb_clear(struct zd_usb *usb)
1166{
1167 usb_set_intfdata(usb->intf, NULL);
1168 usb_put_intf(usb->intf);
c48cf125 1169 ZD_MEMCLEAR(usb, sizeof(*usb));
e85d0918
DD		 1170 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
1171}
1172
1173static const char *speed(enum usb_device_speed speed)
1174{
1175 switch (speed) {
1176 case USB_SPEED_LOW:
1177 return "low";
1178 case USB_SPEED_FULL:
1179 return "full";
1180 case USB_SPEED_HIGH:
1181 return "high";
1182 default:
1183 return "unknown speed";
1184 }
1185}
1186
1187static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1188{
1189 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1190 le16_to_cpu(udev->descriptor.idVendor),
1191 le16_to_cpu(udev->descriptor.idProduct),
1192 get_bcdDevice(udev),
1193 speed(udev->speed));
1194}
1195
1196int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1197{
1198 struct usb_device *udev = interface_to_usbdev(usb->intf);
1199 return scnprint_id(udev, buffer, size);
1200}
1201
1202#ifdef DEBUG
1203static void print_id(struct usb_device *udev)
1204{
1205 char buffer[40];
1206
1207 scnprint_id(udev, buffer, sizeof(buffer));
1208 buffer[sizeof(buffer)-1] = 0;
1209 dev_dbg_f(&udev->dev, "%s\n", buffer);
1210}
1211#else
1212#define print_id(udev) do { } while (0)
1213#endif
1214
a1030e92
DD		 1215static int eject_installer(struct usb_interface *intf)
1216{
1217 struct usb_device *udev = interface_to_usbdev(intf);
1218 struct usb_host_interface *iface_desc = &intf->altsetting[0];
1219 struct usb_endpoint_descriptor *endpoint;
1220 unsigned char *cmd;
1221 u8 bulk_out_ep;
1222 int r;
1223
1224 /* Find bulk out endpoint */
11466f13
SS		 1225 for (r = 1; r >= 0; r--) {
1226 endpoint = &iface_desc->endpoint[r].desc;
1227 if (usb_endpoint_dir_out(endpoint) &&
1228 usb_endpoint_xfer_bulk(endpoint)) {
1229 bulk_out_ep = endpoint->bEndpointAddress;
1230 break;
1231 }
1232 }
1233 if (r == -1) {
a1030e92
DD		 1234 dev_err(&udev->dev,
1235 "zd1211rw: Could not find bulk out endpoint\n");
1236 return -ENODEV;
1237 }
1238
1239 cmd = kzalloc(31, GFP_KERNEL);
1240 if (cmd == NULL)
1241 return -ENODEV;
1242
1243 /* USB bulk command block */
1244 cmd[0] = 0x55; /* bulk command signature */
1245 cmd[1] = 0x53; /* bulk command signature */
1246 cmd[2] = 0x42; /* bulk command signature */
1247 cmd[3] = 0x43; /* bulk command signature */
1248 cmd[14] = 6; /* command length */
1249
1250 cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1251 cmd[19] = 0x2; /* eject disc */
1252
1253 dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1254 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1255 cmd, 31, NULL, 2000);
1256 kfree(cmd);
1257 if (r)
1258 return r;
1259
1260 /* At this point, the device disconnects and reconnects with the real
1261 * ID numbers. */
1262
1263 usb_set_intfdata(intf, NULL);
1264 return 0;
1265}
1266
74553aed
DD		 1267int zd_usb_init_hw(struct zd_usb *usb)
1268{
1269 int r;
1270 struct zd_mac *mac = zd_usb_to_mac(usb);
1271
1272 dev_dbg_f(zd_usb_dev(usb), "\n");
1273
1274 r = upload_firmware(usb);
1275 if (r) {
1276 dev_err(zd_usb_dev(usb),
1277 "couldn't load firmware. Error number %d\n", r);
1278 return r;
1279 }
1280
1281 r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1282 if (r) {
1283 dev_dbg_f(zd_usb_dev(usb),
1284 "couldn't reset configuration. Error number %d\n", r);
1285 return r;
1286 }
1287
459c51ad 1288 r = zd_mac_init_hw(mac->hw);
74553aed
DD		 1289 if (r) {
1290 dev_dbg_f(zd_usb_dev(usb),
1291 "couldn't initialize mac. Error number %d\n", r);
1292 return r;
1293 }
1294
1295 usb->initialized = 1;
1296 return 0;
1297}
1298
e85d0918
DD		 1299static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1300{
1301 int r;
1302 struct usb_device *udev = interface_to_usbdev(intf);
459c51ad
DD		 1303 struct zd_usb *usb;
1304 struct ieee80211_hw *hw = NULL;
e85d0918
DD		 1305
1306 print_id(udev);
1307
a1030e92
DD		 1308 if (id->driver_info & DEVICE_INSTALLER)
1309 return eject_installer(intf);
1310
e85d0918
DD		 1311 switch (udev->speed) {
1312 case USB_SPEED_LOW:
1313 case USB_SPEED_FULL:
1314 case USB_SPEED_HIGH:
1315 break;
1316 default:
1317 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1318 r = -ENODEV;
1319 goto error;
1320 }
1321
459c51ad
DD		 1322 r = usb_reset_device(udev);
1323 if (r) {
1324 dev_err(&intf->dev,
1325 "couldn't reset usb device. Error number %d\n", r);
1326 goto error;
1327 }
6e3632f6 1328
459c51ad
DD		 1329 hw = zd_mac_alloc_hw(intf);
1330 if (hw == NULL) {
e85d0918
DD		 1331 r = -ENOMEM;
1332 goto error;
1333 }
1334
459c51ad 1335 usb = &zd_hw_mac(hw)->chip.usb;
74553aed 1336 usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
e85d0918 1337
459c51ad 1338 r = zd_mac_preinit_hw(hw);
e85d0918
DD		 1339 if (r) {
1340 dev_dbg_f(&intf->dev,
1341 "couldn't initialize mac. Error number %d\n", r);
1342 goto error;
1343 }
1344
459c51ad 1345 r = ieee80211_register_hw(hw);
e85d0918
DD		 1346 if (r) {
1347 dev_dbg_f(&intf->dev,
459c51ad 1348 "couldn't register device. Error number %d\n", r);
e85d0918
DD		 1349 goto error;
1350 }
1351
1352 dev_dbg_f(&intf->dev, "successful\n");
459c51ad 1353 dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
e85d0918
DD		 1354 return 0;
1355error:
1356 usb_reset_device(interface_to_usbdev(intf));
459c51ad
DD		 1357 if (hw) {
1358 zd_mac_clear(zd_hw_mac(hw));
1359 ieee80211_free_hw(hw);
1360 }
e85d0918
DD		 1361 return r;
1362}
1363
1364static void disconnect(struct usb_interface *intf)
1365{
459c51ad 1366 struct ieee80211_hw *hw = zd_intf_to_hw(intf);
e0579d57
MP		 1367 struct zd_mac *mac;
1368 struct zd_usb *usb;
e85d0918 1369
a1030e92
DD		 1370 /* Either something really bad happened, or we're just dealing with
1371 * a DEVICE_INSTALLER. */
459c51ad 1372 if (hw == NULL)
a1030e92
DD		 1373 return;
1374
459c51ad 1375 mac = zd_hw_mac(hw);
e0579d57
MP		 1376 usb = &mac->chip.usb;
1377
e85d0918
DD		 1378 dev_dbg_f(zd_usb_dev(usb), "\n");
1379
459c51ad 1380 ieee80211_unregister_hw(hw);
e85d0918
DD		 1381
1382 /* Just in case something has gone wrong! */
78fc800f 1383 zd_usb_disable_tx(usb);
e85d0918
DD		 1384 zd_usb_disable_rx(usb);
1385 zd_usb_disable_int(usb);
1386
1387 /* If the disconnect has been caused by a removal of the
1388 * driver module, the reset allows reloading of the driver. If the
1389 * reset will not be executed here, the upload of the firmware in the
1390 * probe function caused by the reloading of the driver will fail.
1391 */
1392 usb_reset_device(interface_to_usbdev(intf));
1393
459c51ad
DD		 1394 zd_mac_clear(mac);
1395 ieee80211_free_hw(hw);
e85d0918
DD		 1396 dev_dbg(&intf->dev, "disconnected\n");
1397}
1398
a0fd751f
JK		 1399static void zd_usb_resume(struct zd_usb *usb)
1400{
1401 struct zd_mac *mac = zd_usb_to_mac(usb);
1402 int r;
1403
1404 dev_dbg_f(zd_usb_dev(usb), "\n");
1405
1406 r = zd_op_start(zd_usb_to_hw(usb));
1407 if (r < 0) {
1408 dev_warn(zd_usb_dev(usb), "Device resume failed "
1409 "with error code %d. Retrying...\n", r);
1410 if (usb->was_running)
1411 set_bit(ZD_DEVICE_RUNNING, &mac->flags);
1412 usb_queue_reset_device(usb->intf);
1413 return;
1414 }
1415
1416 if (mac->type != NL80211_IFTYPE_UNSPECIFIED) {
1417 r = zd_restore_settings(mac);
1418 if (r < 0) {
1419 dev_dbg(zd_usb_dev(usb),
1420 "failed to restore settings, %d\n", r);
1421 return;
1422 }
1423 }
1424}
1425
1426static void zd_usb_stop(struct zd_usb *usb)
1427{
1428 dev_dbg_f(zd_usb_dev(usb), "\n");
1429
1430 zd_op_stop(zd_usb_to_hw(usb));
1431
1432 zd_usb_disable_tx(usb);
1433 zd_usb_disable_rx(usb);
1434 zd_usb_disable_int(usb);
1435
1436 usb->initialized = 0;
1437}
1438
1439static int pre_reset(struct usb_interface *intf)
1440{
1441 struct ieee80211_hw *hw = usb_get_intfdata(intf);
1442 struct zd_mac *mac;
1443 struct zd_usb *usb;
1444
1445 if (!hw || intf->condition != USB_INTERFACE_BOUND)
1446 return 0;
1447
1448 mac = zd_hw_mac(hw);
1449 usb = &mac->chip.usb;
1450
1451 usb->was_running = test_bit(ZD_DEVICE_RUNNING, &mac->flags);
1452
1453 zd_usb_stop(usb);
1454
1455 mutex_lock(&mac->chip.mutex);
1456 return 0;
1457}
1458
1459static int post_reset(struct usb_interface *intf)
1460{
1461 struct ieee80211_hw *hw = usb_get_intfdata(intf);
1462 struct zd_mac *mac;
1463 struct zd_usb *usb;
1464
1465 if (!hw || intf->condition != USB_INTERFACE_BOUND)
1466 return 0;
1467
1468 mac = zd_hw_mac(hw);
1469 usb = &mac->chip.usb;
1470
1471 mutex_unlock(&mac->chip.mutex);
1472
1473 if (usb->was_running)
1474 zd_usb_resume(usb);
1475 return 0;
1476}
1477
e85d0918 1478static struct usb_driver driver = {
459c51ad 1479 .name = KBUILD_MODNAME,
e85d0918
DD		 1480 .id_table = usb_ids,
1481 .probe = probe,
1482 .disconnect = disconnect,
a0fd751f
JK		 1483 .pre_reset = pre_reset,
1484 .post_reset = post_reset,
e85d0918
DD		 1485};
1486
bc5f06a8
UK		 1487struct workqueue_struct *zd_workqueue;
1488
e85d0918
DD		 1489static int __init usb_init(void)
1490{
1491 int r;
1492
741fec53 1493 pr_debug("%s usb_init()\n", driver.name);
e85d0918 1494
bc5f06a8
UK		 1495 zd_workqueue = create_singlethread_workqueue(driver.name);
1496 if (zd_workqueue == NULL) {
741fec53 1497 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
bc5f06a8
UK		 1498 return -ENOMEM;
1499 }
1500
e85d0918
DD		 1501 r = usb_register(&driver);
1502 if (r) {
192b775c 1503 destroy_workqueue(zd_workqueue);
741fec53
UK		 1504 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1505 driver.name, r);
e85d0918
DD		 1506 return r;
1507 }
1508
741fec53 1509 pr_debug("%s initialized\n", driver.name);
e85d0918
DD		 1510 return 0;
1511}
1512
1513static void __exit usb_exit(void)
1514{
741fec53 1515 pr_debug("%s usb_exit()\n", driver.name);
e85d0918 1516 usb_deregister(&driver);
bc5f06a8 1517 destroy_workqueue(zd_workqueue);
e85d0918
DD		 1518}
1519
1520module_init(usb_init);
1521module_exit(usb_exit);
1522
1523static int usb_int_regs_length(unsigned int count)
1524{
1525 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1526}
1527
1528static void prepare_read_regs_int(struct zd_usb *usb)
1529{
1530 struct zd_usb_interrupt *intr = &usb->intr;
1531
a68077de 1532 spin_lock_irq(&intr->lock);
e85d0918
DD		 1533 intr->read_regs_enabled = 1;
1534 INIT_COMPLETION(intr->read_regs.completion);
a68077de
UK		 1535 spin_unlock_irq(&intr->lock);
1536}
1537
1538static void disable_read_regs_int(struct zd_usb *usb)
1539{
1540 struct zd_usb_interrupt *intr = &usb->intr;
1541
1542 spin_lock_irq(&intr->lock);
1543 intr->read_regs_enabled = 0;
1544 spin_unlock_irq(&intr->lock);
e85d0918
DD		 1545}
1546
1547static int get_results(struct zd_usb *usb, u16 *values,
1548 struct usb_req_read_regs *req, unsigned int count)
1549{
1550 int r;
1551 int i;
1552 struct zd_usb_interrupt *intr = &usb->intr;
1553 struct read_regs_int *rr = &intr->read_regs;
1554 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1555
a68077de 1556 spin_lock_irq(&intr->lock);
e85d0918
DD		 1557
1558 r = -EIO;
1559 /* The created block size seems to be larger than expected.
1560 * However results appear to be correct.
1561 */
1562 if (rr->length < usb_int_regs_length(count)) {
1563 dev_dbg_f(zd_usb_dev(usb),
1564 "error: actual length %d less than expected %d\n",
1565 rr->length, usb_int_regs_length(count));
1566 goto error_unlock;
1567 }
1568 if (rr->length > sizeof(rr->buffer)) {
1569 dev_dbg_f(zd_usb_dev(usb),
1570 "error: actual length %d exceeds buffer size %zu\n",
1571 rr->length, sizeof(rr->buffer));
1572 goto error_unlock;
1573 }
1574
1575 for (i = 0; i < count; i++) {
1576 struct reg_data *rd = &regs->regs[i];
1577 if (rd->addr != req->addr[i]) {
1578 dev_dbg_f(zd_usb_dev(usb),
1579 "rd[%d] addr %#06hx expected %#06hx\n", i,
1580 le16_to_cpu(rd->addr),
1581 le16_to_cpu(req->addr[i]));
1582 goto error_unlock;
1583 }
1584 values[i] = le16_to_cpu(rd->value);
1585 }
1586
1587 r = 0;
1588error_unlock:
a68077de 1589 spin_unlock_irq(&intr->lock);
e85d0918
DD		 1590 return r;
1591}
1592
1593int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1594 const zd_addr_t *addresses, unsigned int count)
1595{
1596 int r;
1597 int i, req_len, actual_req_len;
1598 struct usb_device *udev;
1599 struct usb_req_read_regs *req = NULL;
1600 unsigned long timeout;
1601
1602 if (count < 1) {
1603 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1604 return -EINVAL;
1605 }
1606 if (count > USB_MAX_IOREAD16_COUNT) {
1607 dev_dbg_f(zd_usb_dev(usb),
1608 "error: count %u exceeds possible max %u\n",
1609 count, USB_MAX_IOREAD16_COUNT);
1610 return -EINVAL;
1611 }
1612 if (in_atomic()) {
1613 dev_dbg_f(zd_usb_dev(usb),
1614 "error: io in atomic context not supported\n");
1615 return -EWOULDBLOCK;
1616 }
1617 if (!usb_int_enabled(usb)) {
9bca0c3b 1618 dev_dbg_f(zd_usb_dev(usb),
e85d0918
DD		 1619 "error: usb interrupt not enabled\n");
1620 return -EWOULDBLOCK;
1621 }
1622
9bca0c3b
JK		 1623 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1624 BUILD_BUG_ON(sizeof(struct usb_req_read_regs) + USB_MAX_IOREAD16_COUNT *
1625 sizeof(__le16) > sizeof(usb->req_buf));
1626 BUG_ON(sizeof(struct usb_req_read_regs) + count * sizeof(__le16) >
1627 sizeof(usb->req_buf));
1628
e85d0918 1629 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
9bca0c3b
JK		 1630 req = (void *)usb->req_buf;
1631
e85d0918
DD		 1632 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1633 for (i = 0; i < count; i++)
0ce34bc8 1634 req->addr[i] = cpu_to_le16((u16)addresses[i]);
e85d0918
DD		 1635
1636 udev = zd_usb_to_usbdev(usb);
1637 prepare_read_regs_int(usb);
37939810
JK		 1638 r = usb_interrupt_msg(udev, usb_sndintpipe(udev, EP_REGS_OUT),
1639 req, req_len, &actual_req_len, 50 /* ms */);
e85d0918
DD		 1640 if (r) {
1641 dev_dbg_f(zd_usb_dev(usb),
37939810 1642 "error in usb_interrupt_msg(). Error number %d\n", r);
e85d0918
DD		 1643 goto error;
1644 }
1645 if (req_len != actual_req_len) {
37939810 1646 dev_dbg_f(zd_usb_dev(usb), "error in usb_interrupt_msg()\n"
e85d0918
DD		 1647 " req_len %d != actual_req_len %d\n",
1648 req_len, actual_req_len);
1649 r = -EIO;
1650 goto error;
1651 }
1652
1653 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
8f2d8f86 1654 msecs_to_jiffies(50));
e85d0918
DD		 1655 if (!timeout) {
1656 disable_read_regs_int(usb);
1657 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1658 r = -ETIMEDOUT;
1659 goto error;
1660 }
1661
1662 r = get_results(usb, values, req, count);
1663error:
e85d0918
DD		 1664 return r;
1665}
1666
eefdbec1
JK		 1667static void iowrite16v_urb_complete(struct urb *urb)
1668{
1669 struct zd_usb *usb = urb->context;
1670
1671 if (urb->status && !usb->cmd_error)
1672 usb->cmd_error = urb->status;
1673}
1674
1675static int zd_submit_waiting_urb(struct zd_usb *usb, bool last)
1676{
1677 int r;
1678 struct urb *urb = usb->urb_async_waiting;
1679
1680 if (!urb)
1681 return 0;
1682
1683 usb->urb_async_waiting = NULL;
1684
1685 if (!last)
1686 urb->transfer_flags |= URB_NO_INTERRUPT;
1687
1688 usb_anchor_urb(urb, &usb->submitted_cmds);
1689 r = usb_submit_urb(urb, GFP_KERNEL);
1690 if (r) {
1691 usb_unanchor_urb(urb);
1692 dev_dbg_f(zd_usb_dev(usb),
1693 "error in usb_submit_urb(). Error number %d\n", r);
1694 goto error;
1695 }
1696
1697 /* fall-through with r == 0 */
1698error:
1699 usb_free_urb(urb);
1700 return r;
1701}
1702
1703static void zd_usb_iowrite16v_async_start(struct zd_usb *usb)
1704{
1705 ZD_ASSERT(usb_anchor_empty(&usb->submitted_cmds));
1706 ZD_ASSERT(usb->urb_async_waiting == NULL);
1707 ZD_ASSERT(!usb->in_async);
1708
1709 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1710
1711 usb->in_async = 1;
1712 usb->cmd_error = 0;
1713 usb->urb_async_waiting = NULL;
1714}
1715
1716static int zd_usb_iowrite16v_async_end(struct zd_usb *usb, unsigned int timeout)
1717{
1718 int r;
1719
1720 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1721 ZD_ASSERT(usb->in_async);
1722
1723 /* Submit last iowrite16v URB */
1724 r = zd_submit_waiting_urb(usb, true);
1725 if (r) {
1726 dev_dbg_f(zd_usb_dev(usb),
1727 "error in zd_submit_waiting_usb(). "
1728 "Error number %d\n", r);
1729
1730 usb_kill_anchored_urbs(&usb->submitted_cmds);
1731 goto error;
1732 }
1733
1734 if (timeout)
1735 timeout = usb_wait_anchor_empty_timeout(&usb->submitted_cmds,
1736 timeout);
1737 if (!timeout) {
1738 usb_kill_anchored_urbs(&usb->submitted_cmds);
1739 if (usb->cmd_error == -ENOENT) {
1740 dev_dbg_f(zd_usb_dev(usb), "timed out");
1741 r = -ETIMEDOUT;
1742 goto error;
1743 }
1744 }
1745
1746 r = usb->cmd_error;
1747error:
1748 usb->in_async = 0;
1749 return r;
1750}
1751
1752static int zd_usb_iowrite16v_async(struct zd_usb *usb,
1753 const struct zd_ioreq16 *ioreqs,
1754 unsigned int count)
e85d0918
DD		 1755{
1756 int r;
1757 struct usb_device *udev;
1758 struct usb_req_write_regs *req = NULL;
eefdbec1
JK		 1759 int i, req_len;
1760 struct urb *urb;
1761 struct usb_host_endpoint *ep;
1762
1763 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1764 ZD_ASSERT(usb->in_async);
e85d0918
DD		 1765
1766 if (count == 0)
1767 return 0;
1768 if (count > USB_MAX_IOWRITE16_COUNT) {
1769 dev_dbg_f(zd_usb_dev(usb),
1770 "error: count %u exceeds possible max %u\n",
1771 count, USB_MAX_IOWRITE16_COUNT);
1772 return -EINVAL;
1773 }
1774 if (in_atomic()) {
1775 dev_dbg_f(zd_usb_dev(usb),
1776 "error: io in atomic context not supported\n");
1777 return -EWOULDBLOCK;
1778 }
1779
eefdbec1
JK		 1780 udev = zd_usb_to_usbdev(usb);
1781
1782 ep = usb_pipe_endpoint(udev, usb_sndintpipe(udev, EP_REGS_OUT));
1783 if (!ep)
1784 return -ENOENT;
1785
1786 urb = usb_alloc_urb(0, GFP_KERNEL);
1787 if (!urb)
1788 return -ENOMEM;
9bca0c3b 1789
e85d0918
DD		 1790 req_len = sizeof(struct usb_req_write_regs) +
1791 count * sizeof(struct reg_data);
eefdbec1
JK		 1792 req = kmalloc(req_len, GFP_KERNEL);
1793 if (!req) {
1794 r = -ENOMEM;
1795 goto error;
1796 }
e85d0918
DD		 1797
1798 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1799 for (i = 0; i < count; i++) {
1800 struct reg_data *rw = &req->reg_writes[i];
0ce34bc8 1801 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
e85d0918
DD		 1802 rw->value = cpu_to_le16(ioreqs[i].value);
1803 }
1804
eefdbec1
JK		 1805 usb_fill_int_urb(urb, udev, usb_sndintpipe(udev, EP_REGS_OUT),
1806 req, req_len, iowrite16v_urb_complete, usb,
1807 ep->desc.bInterval);
1808 urb->transfer_flags |= URB_FREE_BUFFER | URB_SHORT_NOT_OK;
1809
1810 /* Submit previous URB */
1811 r = zd_submit_waiting_urb(usb, false);
e85d0918
DD		 1812 if (r) {
1813 dev_dbg_f(zd_usb_dev(usb),
eefdbec1
JK		 1814 "error in zd_submit_waiting_usb(). "
1815 "Error number %d\n", r);
e85d0918
DD		 1816 goto error;
1817 }
1818
eefdbec1
JK		 1819 /* Delay submit so that URB_NO_INTERRUPT flag can be set for all URBs
1820 * of currect batch except for very last.
1821 */
1822 usb->urb_async_waiting = urb;
1823 return 0;
e85d0918 1824error:
eefdbec1 1825 usb_free_urb(urb);
e85d0918
DD		 1826 return r;
1827}
1828
eefdbec1
JK		 1829int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1830 unsigned int count)
1831{
1832 int r;
1833
1834 zd_usb_iowrite16v_async_start(usb);
1835 r = zd_usb_iowrite16v_async(usb, ioreqs, count);
1836 if (r) {
1837 zd_usb_iowrite16v_async_end(usb, 0);
1838 return r;
1839 }
1840 return zd_usb_iowrite16v_async_end(usb, 50 /* ms */);
1841}
1842
e85d0918
DD		 1843int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1844{
1845 int r;
1846 struct usb_device *udev;
1847 struct usb_req_rfwrite *req = NULL;
1848 int i, req_len, actual_req_len;
1849 u16 bit_value_template;
1850
1851 if (in_atomic()) {
1852 dev_dbg_f(zd_usb_dev(usb),
1853 "error: io in atomic context not supported\n");
1854 return -EWOULDBLOCK;
1855 }
1856 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1857 dev_dbg_f(zd_usb_dev(usb),
1858 "error: bits %d are smaller than"
1859 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1860 bits, USB_MIN_RFWRITE_BIT_COUNT);
1861 return -EINVAL;
1862 }
1863 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1864 dev_dbg_f(zd_usb_dev(usb),
1865 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1866 bits, USB_MAX_RFWRITE_BIT_COUNT);
1867 return -EINVAL;
1868 }
1869#ifdef DEBUG
1870 if (value & (~0UL << bits)) {
1871 dev_dbg_f(zd_usb_dev(usb),
1872 "error: value %#09x has bits >= %d set\n",
1873 value, bits);
1874 return -EINVAL;
1875 }
1876#endif /* DEBUG */
1877
1878 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1879
1880 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1881 if (r) {
1882 dev_dbg_f(zd_usb_dev(usb),
1883 "error %d: Couldn't read CR203\n", r);
9bca0c3b 1884 return r;
e85d0918
DD		 1885 }
1886 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1887
9bca0c3b
JK		 1888 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1889 BUILD_BUG_ON(sizeof(struct usb_req_rfwrite) +
1890 USB_MAX_RFWRITE_BIT_COUNT * sizeof(__le16) >
1891 sizeof(usb->req_buf));
1892 BUG_ON(sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16) >
1893 sizeof(usb->req_buf));
1894
e85d0918 1895 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
9bca0c3b 1896 req = (void *)usb->req_buf;
e85d0918
DD		 1897
1898 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1899 /* 1: 3683a, but not used in ZYDAS driver */
1900 req->value = cpu_to_le16(2);
1901 req->bits = cpu_to_le16(bits);
1902
1903 for (i = 0; i < bits; i++) {
1904 u16 bv = bit_value_template;
1905 if (value & (1 << (bits-1-i)))
1906 bv |= RF_DATA;
1907 req->bit_values[i] = cpu_to_le16(bv);
1908 }
1909
1910 udev = zd_usb_to_usbdev(usb);
37939810
JK		 1911 r = usb_interrupt_msg(udev, usb_sndintpipe(udev, EP_REGS_OUT),
1912 req, req_len, &actual_req_len, 50 /* ms */);
e85d0918
DD		 1913 if (r) {
1914 dev_dbg_f(zd_usb_dev(usb),
37939810 1915 "error in usb_interrupt_msg(). Error number %d\n", r);
e85d0918
DD		 1916 goto out;
1917 }
1918 if (req_len != actual_req_len) {
37939810 1919 dev_dbg_f(zd_usb_dev(usb), "error in usb_interrupt_msg()"
e85d0918
DD		 1920 " req_len %d != actual_req_len %d\n",
1921 req_len, actual_req_len);
1922 r = -EIO;
1923 goto out;
1924 }
1925
1926 /* FALL-THROUGH with r == 0 */
1927out:
e85d0918
DD		 1928 return r;
1929}
Linux kernel - Deliverables
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