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