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proc: use seq_puts()/seq_putc() where possible
[linux-2.6/next.git] / drivers / net / wireless / zd1211rw / zd_usb.c
blob06041cb1c4220e548a08d4229a5a64ca645a0bbb
1 /* ZD1211 USB-WLAN driver for Linux
2 *
3 * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
4 * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
5 * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 #include <linux/kernel.h>
23 #include <linux/init.h>
24 #include <linux/firmware.h>
25 #include <linux/device.h>
26 #include <linux/errno.h>
27 #include <linux/slab.h>
28 #include <linux/skbuff.h>
29 #include <linux/usb.h>
30 #include <linux/workqueue.h>
31 #include <net/mac80211.h>
32 #include <asm/unaligned.h>
33
34 #include "zd_def.h"
35 #include "zd_mac.h"
36 #include "zd_usb.h"
37
38 static struct usb_device_id usb_ids[] = {
39 /* ZD1211 */
40 { USB_DEVICE(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 },
41 { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
42 { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
43 { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
44 { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
45 { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
46 { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
47 { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
48 { USB_DEVICE(0x0ace, 0xa211), .driver_info = DEVICE_ZD1211 },
49 { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
50 { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
51 { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
52 { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
53 { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
54 { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
55 { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 },
56 { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
57 { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
58 { USB_DEVICE(0x14ea, 0xab10), .driver_info = DEVICE_ZD1211 },
59 { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
60 { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
61 { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
62 { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
63 { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
64 { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
65 /* ZD1211B */
66 { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
67 { USB_DEVICE(0x0409, 0x0248), .driver_info = DEVICE_ZD1211B },
68 { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
69 { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
70 { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
71 { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
72 { USB_DEVICE(0x054c, 0x0257), .driver_info = DEVICE_ZD1211B },
73 { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
74 { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
75 { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
76 { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
77 { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
78 { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
79 { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211B },
80 { USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B },
81 { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
82 { USB_DEVICE(0x083a, 0xe501), .driver_info = DEVICE_ZD1211B },
83 { USB_DEVICE(0x083a, 0xe503), .driver_info = DEVICE_ZD1211B },
84 { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
85 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
86 { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B },
87 { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
88 { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
89 { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
90 { USB_DEVICE(0x0df6, 0x0036), .driver_info = DEVICE_ZD1211B },
91 { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
92 { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
93 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
94 { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
95 { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
96 { USB_DEVICE(0x2019, 0xed01), .driver_info = DEVICE_ZD1211B },
97 /* "Driverless" devices that need ejecting */
98 { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
99 { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
100 {}
101 };
102
103 MODULE_LICENSE("GPL");
104 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
105 MODULE_AUTHOR("Ulrich Kunitz");
106 MODULE_AUTHOR("Daniel Drake");
107 MODULE_VERSION("1.0");
108 MODULE_DEVICE_TABLE(usb, usb_ids);
109
110 #define FW_ZD1211_PREFIX "zd1211/zd1211_"
111 #define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
112
113 /* USB device initialization */
114 static void int_urb_complete(struct urb *urb);
115
116 static int request_fw_file(
117 const struct firmware **fw, const char *name, struct device *device)
118 {
119 int r;
120
121 dev_dbg_f(device, "fw name %s\n", name);
122
123 r = request_firmware(fw, name, device);
124 if (r)
125 dev_err(device,
126 "Could not load firmware file %s. Error number %d\n",
127 name, r);
128 return r;
129 }
130
131 static inline u16 get_bcdDevice(const struct usb_device *udev)
132 {
133 return le16_to_cpu(udev->descriptor.bcdDevice);
134 }
135
136 enum upload_code_flags {
137 REBOOT = 1,
138 };
139
140 /* Ensures that MAX_TRANSFER_SIZE is even. */
141 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
142
143 static int upload_code(struct usb_device *udev,
144 const u8 *data, size_t size, u16 code_offset, int flags)
145 {
146 u8 *p;
147 int r;
148
149 /* USB request blocks need "kmalloced" buffers.
150 */
151 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
152 if (!p) {
153 dev_err(&udev->dev, "out of memory\n");
154 r = -ENOMEM;
155 goto error;
156 }
157
158 size &= ~1;
159 while (size > 0) {
160 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
161 size : MAX_TRANSFER_SIZE;
162
163 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
164
165 memcpy(p, data, transfer_size);
166 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
167 USB_REQ_FIRMWARE_DOWNLOAD,
168 USB_DIR_OUT | USB_TYPE_VENDOR,
169 code_offset, 0, p, transfer_size, 1000 /* ms */);
170 if (r < 0) {
171 dev_err(&udev->dev,
172 "USB control request for firmware upload"
173 " failed. Error number %d\n", r);
174 goto error;
175 }
176 transfer_size = r & ~1;
177
178 size -= transfer_size;
179 data += transfer_size;
180 code_offset += transfer_size/sizeof(u16);
181 }
182
183 if (flags & REBOOT) {
184 u8 ret;
185
186 /* Use "DMA-aware" buffer. */
187 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
188 USB_REQ_FIRMWARE_CONFIRM,
189 USB_DIR_IN | USB_TYPE_VENDOR,
190 0, 0, p, sizeof(ret), 5000 /* ms */);
191 if (r != sizeof(ret)) {
192 dev_err(&udev->dev,
193 "control request firmeware confirmation failed."
194 " Return value %d\n", r);
195 if (r >= 0)
196 r = -ENODEV;
197 goto error;
198 }
199 ret = p[0];
200 if (ret & 0x80) {
201 dev_err(&udev->dev,
202 "Internal error while downloading."
203 " Firmware confirm return value %#04x\n",
204 (unsigned int)ret);
205 r = -ENODEV;
206 goto error;
207 }
208 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
209 (unsigned int)ret);
210 }
211
212 r = 0;
213 error:
214 kfree(p);
215 return r;
216 }
217
218 static u16 get_word(const void *data, u16 offset)
219 {
220 const __le16 *p = data;
221 return le16_to_cpu(p[offset]);
222 }
223
224 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
225 const char* postfix)
226 {
227 scnprintf(buffer, size, "%s%s",
228 usb->is_zd1211b ?
229 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
230 postfix);
231 return buffer;
232 }
233
234 static int handle_version_mismatch(struct zd_usb *usb,
235 const struct firmware *ub_fw)
236 {
237 struct usb_device *udev = zd_usb_to_usbdev(usb);
238 const struct firmware *ur_fw = NULL;
239 int offset;
240 int r = 0;
241 char fw_name[128];
242
243 r = request_fw_file(&ur_fw,
244 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
245 &udev->dev);
246 if (r)
247 goto error;
248
249 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
250 if (r)
251 goto error;
252
253 offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
254 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
255 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
256
257 /* At this point, the vendor driver downloads the whole firmware
258 * image, hacks around with version IDs, and uploads it again,
259 * completely overwriting the boot code. We do not do this here as
260 * it is not required on any tested devices, and it is suspected to
261 * cause problems. */
262 error:
263 release_firmware(ur_fw);
264 return r;
265 }
266
267 static int upload_firmware(struct zd_usb *usb)
268 {
269 int r;
270 u16 fw_bcdDevice;
271 u16 bcdDevice;
272 struct usb_device *udev = zd_usb_to_usbdev(usb);
273 const struct firmware *ub_fw = NULL;
274 const struct firmware *uph_fw = NULL;
275 char fw_name[128];
276
277 bcdDevice = get_bcdDevice(udev);
278
279 r = request_fw_file(&ub_fw,
280 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
281 &udev->dev);
282 if (r)
283 goto error;
284
285 fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
286
287 if (fw_bcdDevice != bcdDevice) {
288 dev_info(&udev->dev,
289 "firmware version %#06x and device bootcode version "
290 "%#06x differ\n", fw_bcdDevice, bcdDevice);
291 if (bcdDevice <= 0x4313)
292 dev_warn(&udev->dev, "device has old bootcode, please "
293 "report success or failure\n");
294
295 r = handle_version_mismatch(usb, ub_fw);
296 if (r)
297 goto error;
298 } else {
299 dev_dbg_f(&udev->dev,
300 "firmware device id %#06x is equal to the "
301 "actual device id\n", fw_bcdDevice);
302 }
303
304
305 r = request_fw_file(&uph_fw,
306 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
307 &udev->dev);
308 if (r)
309 goto error;
310
311 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
312 if (r) {
313 dev_err(&udev->dev,
314 "Could not upload firmware code uph. Error number %d\n",
315 r);
316 }
317
318 /* FALL-THROUGH */
319 error:
320 release_firmware(ub_fw);
321 release_firmware(uph_fw);
322 return r;
323 }
324
325 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ur");
326 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ur");
327 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ub");
328 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ub");
329 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "uphr");
330 MODULE_FIRMWARE(FW_ZD1211_PREFIX "uphr");
331
332 /* Read data from device address space using "firmware interface" which does
333 * not require firmware to be loaded. */
334 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
335 {
336 int r;
337 struct usb_device *udev = zd_usb_to_usbdev(usb);
338 u8 *buf;
339
340 /* Use "DMA-aware" buffer. */
341 buf = kmalloc(len, GFP_KERNEL);
342 if (!buf)
343 return -ENOMEM;
344 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
345 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
346 buf, len, 5000);
347 if (r < 0) {
348 dev_err(&udev->dev,
349 "read over firmware interface failed: %d\n", r);
350 goto exit;
351 } else if (r != len) {
352 dev_err(&udev->dev,
353 "incomplete read over firmware interface: %d/%d\n",
354 r, len);
355 r = -EIO;
356 goto exit;
357 }
358 r = 0;
359 memcpy(data, buf, len);
360 exit:
361 kfree(buf);
362 return r;
363 }
364
365 #define urb_dev(urb) (&(urb)->dev->dev)
366
367 static inline void handle_regs_int(struct urb *urb)
368 {
369 struct zd_usb *usb = urb->context;
370 struct zd_usb_interrupt *intr = &usb->intr;
371 int len;
372 u16 int_num;
373
374 ZD_ASSERT(in_interrupt());
375 spin_lock(&intr->lock);
376
377 int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
378 if (int_num == CR_INTERRUPT) {
379 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
380 memcpy(&mac->intr_buffer, urb->transfer_buffer,
381 USB_MAX_EP_INT_BUFFER);
382 schedule_work(&mac->process_intr);
383 } else if (intr->read_regs_enabled) {
384 intr->read_regs.length = len = urb->actual_length;
385
386 if (len > sizeof(intr->read_regs.buffer))
387 len = sizeof(intr->read_regs.buffer);
388 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
389 intr->read_regs_enabled = 0;
390 complete(&intr->read_regs.completion);
391 goto out;
392 }
393
394 out:
395 spin_unlock(&intr->lock);
396 }
397
398 static void int_urb_complete(struct urb *urb)
399 {
400 int r;
401 struct usb_int_header *hdr;
402
403 switch (urb->status) {
404 case 0:
405 break;
406 case -ESHUTDOWN:
407 case -EINVAL:
408 case -ENODEV:
409 case -ENOENT:
410 case -ECONNRESET:
411 case -EPIPE:
412 goto kfree;
413 default:
414 goto resubmit;
415 }
416
417 if (urb->actual_length < sizeof(hdr)) {
418 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
419 goto resubmit;
420 }
421
422 hdr = urb->transfer_buffer;
423 if (hdr->type != USB_INT_TYPE) {
424 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
425 goto resubmit;
426 }
427
428 switch (hdr->id) {
429 case USB_INT_ID_REGS:
430 handle_regs_int(urb);
431 break;
432 case USB_INT_ID_RETRY_FAILED:
433 zd_mac_tx_failed(urb);
434 break;
435 default:
436 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
437 (unsigned int)hdr->id);
438 goto resubmit;
439 }
440
441 resubmit:
442 r = usb_submit_urb(urb, GFP_ATOMIC);
443 if (r) {
444 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
445 goto kfree;
446 }
447 return;
448 kfree:
449 kfree(urb->transfer_buffer);
450 }
451
452 static inline int int_urb_interval(struct usb_device *udev)
453 {
454 switch (udev->speed) {
455 case USB_SPEED_HIGH:
456 return 4;
457 case USB_SPEED_LOW:
458 return 10;
459 case USB_SPEED_FULL:
460 default:
461 return 1;
462 }
463 }
464
465 static inline int usb_int_enabled(struct zd_usb *usb)
466 {
467 unsigned long flags;
468 struct zd_usb_interrupt *intr = &usb->intr;
469 struct urb *urb;
470
471 spin_lock_irqsave(&intr->lock, flags);
472 urb = intr->urb;
473 spin_unlock_irqrestore(&intr->lock, flags);
474 return urb != NULL;
475 }
476
477 int zd_usb_enable_int(struct zd_usb *usb)
478 {
479 int r;
480 struct usb_device *udev;
481 struct zd_usb_interrupt *intr = &usb->intr;
482 void *transfer_buffer = NULL;
483 struct urb *urb;
484
485 dev_dbg_f(zd_usb_dev(usb), "\n");
486
487 urb = usb_alloc_urb(0, GFP_KERNEL);
488 if (!urb) {
489 r = -ENOMEM;
490 goto out;
491 }
492
493 ZD_ASSERT(!irqs_disabled());
494 spin_lock_irq(&intr->lock);
495 if (intr->urb) {
496 spin_unlock_irq(&intr->lock);
497 r = 0;
498 goto error_free_urb;
499 }
500 intr->urb = urb;
501 spin_unlock_irq(&intr->lock);
502
503 /* TODO: make it a DMA buffer */
504 r = -ENOMEM;
505 transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
506 if (!transfer_buffer) {
507 dev_dbg_f(zd_usb_dev(usb),
508 "couldn't allocate transfer_buffer\n");
509 goto error_set_urb_null;
510 }
511
512 udev = zd_usb_to_usbdev(usb);
513 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
514 transfer_buffer, USB_MAX_EP_INT_BUFFER,
515 int_urb_complete, usb,
516 intr->interval);
517
518 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
519 r = usb_submit_urb(urb, GFP_KERNEL);
520 if (r) {
521 dev_dbg_f(zd_usb_dev(usb),
522 "Couldn't submit urb. Error number %d\n", r);
523 goto error;
524 }
525
526 return 0;
527 error:
528 kfree(transfer_buffer);
529 error_set_urb_null:
530 spin_lock_irq(&intr->lock);
531 intr->urb = NULL;
532 spin_unlock_irq(&intr->lock);
533 error_free_urb:
534 usb_free_urb(urb);
535 out:
536 return r;
537 }
538
539 void zd_usb_disable_int(struct zd_usb *usb)
540 {
541 unsigned long flags;
542 struct zd_usb_interrupt *intr = &usb->intr;
543 struct urb *urb;
544
545 spin_lock_irqsave(&intr->lock, flags);
546 urb = intr->urb;
547 if (!urb) {
548 spin_unlock_irqrestore(&intr->lock, flags);
549 return;
550 }
551 intr->urb = NULL;
552 spin_unlock_irqrestore(&intr->lock, flags);
553
554 usb_kill_urb(urb);
555 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
556 usb_free_urb(urb);
557 }
558
559 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
560 unsigned int length)
561 {
562 int i;
563 const struct rx_length_info *length_info;
564
565 if (length < sizeof(struct rx_length_info)) {
566 /* It's not a complete packet anyhow. */
567 printk("%s: invalid, small RX packet : %d\n",
568 __func__, length);
569 return;
570 }
571 length_info = (struct rx_length_info *)
572 (buffer + length - sizeof(struct rx_length_info));
573
574 /* It might be that three frames are merged into a single URB
575 * transaction. We have to check for the length info tag.
576 *
577 * While testing we discovered that length_info might be unaligned,
578 * because if USB transactions are merged, the last packet will not
579 * be padded. Unaligned access might also happen if the length_info
580 * structure is not present.
581 */
582 if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
583 {
584 unsigned int l, k, n;
585 for (i = 0, l = 0;; i++) {
586 k = get_unaligned_le16(&length_info->length[i]);
587 if (k == 0)
588 return;
589 n = l+k;
590 if (n > length)
591 return;
592 zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
593 if (i >= 2)
594 return;
595 l = (n+3) & ~3;
596 }
597 } else {
598 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
599 }
600 }
601
602 static void rx_urb_complete(struct urb *urb)
603 {
604 struct zd_usb *usb;
605 struct zd_usb_rx *rx;
606 const u8 *buffer;
607 unsigned int length;
608
609 switch (urb->status) {
610 case 0:
611 break;
612 case -ESHUTDOWN:
613 case -EINVAL:
614 case -ENODEV:
615 case -ENOENT:
616 case -ECONNRESET:
617 case -EPIPE:
618 return;
619 default:
620 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
621 goto resubmit;
622 }
623
624 buffer = urb->transfer_buffer;
625 length = urb->actual_length;
626 usb = urb->context;
627 rx = &usb->rx;
628
629 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
630 /* If there is an old first fragment, we don't care. */
631 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
632 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
633 spin_lock(&rx->lock);
634 memcpy(rx->fragment, buffer, length);
635 rx->fragment_length = length;
636 spin_unlock(&rx->lock);
637 goto resubmit;
638 }
639
640 spin_lock(&rx->lock);
641 if (rx->fragment_length > 0) {
642 /* We are on a second fragment, we believe */
643 ZD_ASSERT(length + rx->fragment_length <=
644 ARRAY_SIZE(rx->fragment));
645 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
646 memcpy(rx->fragment+rx->fragment_length, buffer, length);
647 handle_rx_packet(usb, rx->fragment,
648 rx->fragment_length + length);
649 rx->fragment_length = 0;
650 spin_unlock(&rx->lock);
651 } else {
652 spin_unlock(&rx->lock);
653 handle_rx_packet(usb, buffer, length);
654 }
655
656 resubmit:
657 usb_submit_urb(urb, GFP_ATOMIC);
658 }
659
660 static struct urb *alloc_rx_urb(struct zd_usb *usb)
661 {
662 struct usb_device *udev = zd_usb_to_usbdev(usb);
663 struct urb *urb;
664 void *buffer;
665
666 urb = usb_alloc_urb(0, GFP_KERNEL);
667 if (!urb)
668 return NULL;
669 buffer = usb_alloc_coherent(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
670 &urb->transfer_dma);
671 if (!buffer) {
672 usb_free_urb(urb);
673 return NULL;
674 }
675
676 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
677 buffer, USB_MAX_RX_SIZE,
678 rx_urb_complete, usb);
679 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
680
681 return urb;
682 }
683
684 static void free_rx_urb(struct urb *urb)
685 {
686 if (!urb)
687 return;
688 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
689 urb->transfer_buffer, urb->transfer_dma);
690 usb_free_urb(urb);
691 }
692
693 int zd_usb_enable_rx(struct zd_usb *usb)
694 {
695 int i, r;
696 struct zd_usb_rx *rx = &usb->rx;
697 struct urb **urbs;
698
699 dev_dbg_f(zd_usb_dev(usb), "\n");
700
701 r = -ENOMEM;
702 urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
703 if (!urbs)
704 goto error;
705 for (i = 0; i < RX_URBS_COUNT; i++) {
706 urbs[i] = alloc_rx_urb(usb);
707 if (!urbs[i])
708 goto error;
709 }
710
711 ZD_ASSERT(!irqs_disabled());
712 spin_lock_irq(&rx->lock);
713 if (rx->urbs) {
714 spin_unlock_irq(&rx->lock);
715 r = 0;
716 goto error;
717 }
718 rx->urbs = urbs;
719 rx->urbs_count = RX_URBS_COUNT;
720 spin_unlock_irq(&rx->lock);
721
722 for (i = 0; i < RX_URBS_COUNT; i++) {
723 r = usb_submit_urb(urbs[i], GFP_KERNEL);
724 if (r)
725 goto error_submit;
726 }
727
728 return 0;
729 error_submit:
730 for (i = 0; i < RX_URBS_COUNT; i++) {
731 usb_kill_urb(urbs[i]);
732 }
733 spin_lock_irq(&rx->lock);
734 rx->urbs = NULL;
735 rx->urbs_count = 0;
736 spin_unlock_irq(&rx->lock);
737 error:
738 if (urbs) {
739 for (i = 0; i < RX_URBS_COUNT; i++)
740 free_rx_urb(urbs[i]);
741 }
742 return r;
743 }
744
745 void zd_usb_disable_rx(struct zd_usb *usb)
746 {
747 int i;
748 unsigned long flags;
749 struct urb **urbs;
750 unsigned int count;
751 struct zd_usb_rx *rx = &usb->rx;
752
753 spin_lock_irqsave(&rx->lock, flags);
754 urbs = rx->urbs;
755 count = rx->urbs_count;
756 spin_unlock_irqrestore(&rx->lock, flags);
757 if (!urbs)
758 return;
759
760 for (i = 0; i < count; i++) {
761 usb_kill_urb(urbs[i]);
762 free_rx_urb(urbs[i]);
763 }
764 kfree(urbs);
765
766 spin_lock_irqsave(&rx->lock, flags);
767 rx->urbs = NULL;
768 rx->urbs_count = 0;
769 spin_unlock_irqrestore(&rx->lock, flags);
770 }
771
772 /**
773 * zd_usb_disable_tx - disable transmission
774 * @usb: the zd1211rw-private USB structure
775 *
776 * Frees all URBs in the free list and marks the transmission as disabled.
777 */
778 void zd_usb_disable_tx(struct zd_usb *usb)
779 {
780 struct zd_usb_tx *tx = &usb->tx;
781 unsigned long flags;
782 struct list_head *pos, *n;
783
784 spin_lock_irqsave(&tx->lock, flags);
785 list_for_each_safe(pos, n, &tx->free_urb_list) {
786 list_del(pos);
787 usb_free_urb(list_entry(pos, struct urb, urb_list));
788 }
789 tx->enabled = 0;
790 tx->submitted_urbs = 0;
791 /* The stopped state is ignored, relying on ieee80211_wake_queues()
792 * in a potentionally following zd_usb_enable_tx().
793 */
794 spin_unlock_irqrestore(&tx->lock, flags);
795 }
796
797 /**
798 * zd_usb_enable_tx - enables transmission
799 * @usb: a &struct zd_usb pointer
800 *
801 * This function enables transmission and prepares the &zd_usb_tx data
802 * structure.
803 */
804 void zd_usb_enable_tx(struct zd_usb *usb)
805 {
806 unsigned long flags;
807 struct zd_usb_tx *tx = &usb->tx;
808
809 spin_lock_irqsave(&tx->lock, flags);
810 tx->enabled = 1;
811 tx->submitted_urbs = 0;
812 ieee80211_wake_queues(zd_usb_to_hw(usb));
813 tx->stopped = 0;
814 spin_unlock_irqrestore(&tx->lock, flags);
815 }
816
817 /**
818 * alloc_tx_urb - provides an tx URB
819 * @usb: a &struct zd_usb pointer
820 *
821 * Allocates a new URB. If possible takes the urb from the free list in
822 * usb->tx.
823 */
824 static struct urb *alloc_tx_urb(struct zd_usb *usb)
825 {
826 struct zd_usb_tx *tx = &usb->tx;
827 unsigned long flags;
828 struct list_head *entry;
829 struct urb *urb;
830
831 spin_lock_irqsave(&tx->lock, flags);
832 if (list_empty(&tx->free_urb_list)) {
833 urb = usb_alloc_urb(0, GFP_ATOMIC);
834 goto out;
835 }
836 entry = tx->free_urb_list.next;
837 list_del(entry);
838 urb = list_entry(entry, struct urb, urb_list);
839 out:
840 spin_unlock_irqrestore(&tx->lock, flags);
841 return urb;
842 }
843
844 /**
845 * free_tx_urb - frees a used tx URB
846 * @usb: a &struct zd_usb pointer
847 * @urb: URB to be freed
848 *
849 * Frees the transmission URB, which means to put it on the free URB
850 * list.
851 */
852 static void free_tx_urb(struct zd_usb *usb, struct urb *urb)
853 {
854 struct zd_usb_tx *tx = &usb->tx;
855 unsigned long flags;
856
857 spin_lock_irqsave(&tx->lock, flags);
858 if (!tx->enabled) {
859 usb_free_urb(urb);
860 goto out;
861 }
862 list_add(&urb->urb_list, &tx->free_urb_list);
863 out:
864 spin_unlock_irqrestore(&tx->lock, flags);
865 }
866
867 static void tx_dec_submitted_urbs(struct zd_usb *usb)
868 {
869 struct zd_usb_tx *tx = &usb->tx;
870 unsigned long flags;
871
872 spin_lock_irqsave(&tx->lock, flags);
873 --tx->submitted_urbs;
874 if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
875 ieee80211_wake_queues(zd_usb_to_hw(usb));
876 tx->stopped = 0;
877 }
878 spin_unlock_irqrestore(&tx->lock, flags);
879 }
880
881 static void tx_inc_submitted_urbs(struct zd_usb *usb)
882 {
883 struct zd_usb_tx *tx = &usb->tx;
884 unsigned long flags;
885
886 spin_lock_irqsave(&tx->lock, flags);
887 ++tx->submitted_urbs;
888 if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
889 ieee80211_stop_queues(zd_usb_to_hw(usb));
890 tx->stopped = 1;
891 }
892 spin_unlock_irqrestore(&tx->lock, flags);
893 }
894
895 /**
896 * tx_urb_complete - completes the execution of an URB
897 * @urb: a URB
898 *
899 * This function is called if the URB has been transferred to a device or an
900 * error has happened.
901 */
902 static void tx_urb_complete(struct urb *urb)
903 {
904 int r;
905 struct sk_buff *skb;
906 struct ieee80211_tx_info *info;
907 struct zd_usb *usb;
908
909 switch (urb->status) {
910 case 0:
911 break;
912 case -ESHUTDOWN:
913 case -EINVAL:
914 case -ENODEV:
915 case -ENOENT:
916 case -ECONNRESET:
917 case -EPIPE:
918 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
919 break;
920 default:
921 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
922 goto resubmit;
923 }
924 free_urb:
925 skb = (struct sk_buff *)urb->context;
926 /*
927 * grab 'usb' pointer before handing off the skb (since
928 * it might be freed by zd_mac_tx_to_dev or mac80211)
929 */
930 info = IEEE80211_SKB_CB(skb);
931 usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb;
932 zd_mac_tx_to_dev(skb, urb->status);
933 free_tx_urb(usb, urb);
934 tx_dec_submitted_urbs(usb);
935 return;
936 resubmit:
937 r = usb_submit_urb(urb, GFP_ATOMIC);
938 if (r) {
939 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
940 goto free_urb;
941 }
942 }
943
944 /**
945 * zd_usb_tx: initiates transfer of a frame of the device
946 *
947 * @usb: the zd1211rw-private USB structure
948 * @skb: a &struct sk_buff pointer
949 *
950 * This function tranmits a frame to the device. It doesn't wait for
951 * completion. The frame must contain the control set and have all the
952 * control set information available.
953 *
954 * The function returns 0 if the transfer has been successfully initiated.
955 */
956 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
957 {
958 int r;
959 struct usb_device *udev = zd_usb_to_usbdev(usb);
960 struct urb *urb;
961
962 urb = alloc_tx_urb(usb);
963 if (!urb) {
964 r = -ENOMEM;
965 goto out;
966 }
967
968 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
969 skb->data, skb->len, tx_urb_complete, skb);
970
971 r = usb_submit_urb(urb, GFP_ATOMIC);
972 if (r)
973 goto error;
974 tx_inc_submitted_urbs(usb);
975 return 0;
976 error:
977 free_tx_urb(usb, urb);
978 out:
979 return r;
980 }
981
982 static inline void init_usb_interrupt(struct zd_usb *usb)
983 {
984 struct zd_usb_interrupt *intr = &usb->intr;
985
986 spin_lock_init(&intr->lock);
987 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
988 init_completion(&intr->read_regs.completion);
989 intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
990 }
991
992 static inline void init_usb_rx(struct zd_usb *usb)
993 {
994 struct zd_usb_rx *rx = &usb->rx;
995 spin_lock_init(&rx->lock);
996 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
997 rx->usb_packet_size = 512;
998 } else {
999 rx->usb_packet_size = 64;
1000 }
1001 ZD_ASSERT(rx->fragment_length == 0);
1002 }
1003
1004 static inline void init_usb_tx(struct zd_usb *usb)
1005 {
1006 struct zd_usb_tx *tx = &usb->tx;
1007 spin_lock_init(&tx->lock);
1008 tx->enabled = 0;
1009 tx->stopped = 0;
1010 INIT_LIST_HEAD(&tx->free_urb_list);
1011 tx->submitted_urbs = 0;
1012 }
1013
1014 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
1015 struct usb_interface *intf)
1016 {
1017 memset(usb, 0, sizeof(*usb));
1018 usb->intf = usb_get_intf(intf);
1019 usb_set_intfdata(usb->intf, hw);
1020 init_usb_interrupt(usb);
1021 init_usb_tx(usb);
1022 init_usb_rx(usb);
1023 }
1024
1025 void zd_usb_clear(struct zd_usb *usb)
1026 {
1027 usb_set_intfdata(usb->intf, NULL);
1028 usb_put_intf(usb->intf);
1029 ZD_MEMCLEAR(usb, sizeof(*usb));
1030 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
1031 }
1032
1033 static const char *speed(enum usb_device_speed speed)
1034 {
1035 switch (speed) {
1036 case USB_SPEED_LOW:
1037 return "low";
1038 case USB_SPEED_FULL:
1039 return "full";
1040 case USB_SPEED_HIGH:
1041 return "high";
1042 default:
1043 return "unknown speed";
1044 }
1045 }
1046
1047 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1048 {
1049 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1050 le16_to_cpu(udev->descriptor.idVendor),
1051 le16_to_cpu(udev->descriptor.idProduct),
1052 get_bcdDevice(udev),
1053 speed(udev->speed));
1054 }
1055
1056 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1057 {
1058 struct usb_device *udev = interface_to_usbdev(usb->intf);
1059 return scnprint_id(udev, buffer, size);
1060 }
1061
1062 #ifdef DEBUG
1063 static void print_id(struct usb_device *udev)
1064 {
1065 char buffer[40];
1066
1067 scnprint_id(udev, buffer, sizeof(buffer));
1068 buffer[sizeof(buffer)-1] = 0;
1069 dev_dbg_f(&udev->dev, "%s\n", buffer);
1070 }
1071 #else
1072 #define print_id(udev) do { } while (0)
1073 #endif
1074
1075 static int eject_installer(struct usb_interface *intf)
1076 {
1077 struct usb_device *udev = interface_to_usbdev(intf);
1078 struct usb_host_interface *iface_desc = &intf->altsetting[0];
1079 struct usb_endpoint_descriptor *endpoint;
1080 unsigned char *cmd;
1081 u8 bulk_out_ep;
1082 int r;
1083
1084 /* Find bulk out endpoint */
1085 for (r = 1; r >= 0; r--) {
1086 endpoint = &iface_desc->endpoint[r].desc;
1087 if (usb_endpoint_dir_out(endpoint) &&
1088 usb_endpoint_xfer_bulk(endpoint)) {
1089 bulk_out_ep = endpoint->bEndpointAddress;
1090 break;
1091 }
1092 }
1093 if (r == -1) {
1094 dev_err(&udev->dev,
1095 "zd1211rw: Could not find bulk out endpoint\n");
1096 return -ENODEV;
1097 }
1098
1099 cmd = kzalloc(31, GFP_KERNEL);
1100 if (cmd == NULL)
1101 return -ENODEV;
1102
1103 /* USB bulk command block */
1104 cmd[0] = 0x55; /* bulk command signature */
1105 cmd[1] = 0x53; /* bulk command signature */
1106 cmd[2] = 0x42; /* bulk command signature */
1107 cmd[3] = 0x43; /* bulk command signature */
1108 cmd[14] = 6; /* command length */
1109
1110 cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1111 cmd[19] = 0x2; /* eject disc */
1112
1113 dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1114 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1115 cmd, 31, NULL, 2000);
1116 kfree(cmd);
1117 if (r)
1118 return r;
1119
1120 /* At this point, the device disconnects and reconnects with the real
1121 * ID numbers. */
1122
1123 usb_set_intfdata(intf, NULL);
1124 return 0;
1125 }
1126
1127 int zd_usb_init_hw(struct zd_usb *usb)
1128 {
1129 int r;
1130 struct zd_mac *mac = zd_usb_to_mac(usb);
1131
1132 dev_dbg_f(zd_usb_dev(usb), "\n");
1133
1134 r = upload_firmware(usb);
1135 if (r) {
1136 dev_err(zd_usb_dev(usb),
1137 "couldn't load firmware. Error number %d\n", r);
1138 return r;
1139 }
1140
1141 r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1142 if (r) {
1143 dev_dbg_f(zd_usb_dev(usb),
1144 "couldn't reset configuration. Error number %d\n", r);
1145 return r;
1146 }
1147
1148 r = zd_mac_init_hw(mac->hw);
1149 if (r) {
1150 dev_dbg_f(zd_usb_dev(usb),
1151 "couldn't initialize mac. Error number %d\n", r);
1152 return r;
1153 }
1154
1155 usb->initialized = 1;
1156 return 0;
1157 }
1158
1159 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1160 {
1161 int r;
1162 struct usb_device *udev = interface_to_usbdev(intf);
1163 struct zd_usb *usb;
1164 struct ieee80211_hw *hw = NULL;
1165
1166 print_id(udev);
1167
1168 if (id->driver_info & DEVICE_INSTALLER)
1169 return eject_installer(intf);
1170
1171 switch (udev->speed) {
1172 case USB_SPEED_LOW:
1173 case USB_SPEED_FULL:
1174 case USB_SPEED_HIGH:
1175 break;
1176 default:
1177 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1178 r = -ENODEV;
1179 goto error;
1180 }
1181
1182 r = usb_reset_device(udev);
1183 if (r) {
1184 dev_err(&intf->dev,
1185 "couldn't reset usb device. Error number %d\n", r);
1186 goto error;
1187 }
1188
1189 hw = zd_mac_alloc_hw(intf);
1190 if (hw == NULL) {
1191 r = -ENOMEM;
1192 goto error;
1193 }
1194
1195 usb = &zd_hw_mac(hw)->chip.usb;
1196 usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1197
1198 r = zd_mac_preinit_hw(hw);
1199 if (r) {
1200 dev_dbg_f(&intf->dev,
1201 "couldn't initialize mac. Error number %d\n", r);
1202 goto error;
1203 }
1204
1205 r = ieee80211_register_hw(hw);
1206 if (r) {
1207 dev_dbg_f(&intf->dev,
1208 "couldn't register device. Error number %d\n", r);
1209 goto error;
1210 }
1211
1212 dev_dbg_f(&intf->dev, "successful\n");
1213 dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
1214 return 0;
1215 error:
1216 usb_reset_device(interface_to_usbdev(intf));
1217 if (hw) {
1218 zd_mac_clear(zd_hw_mac(hw));
1219 ieee80211_free_hw(hw);
1220 }
1221 return r;
1222 }
1223
1224 static void disconnect(struct usb_interface *intf)
1225 {
1226 struct ieee80211_hw *hw = zd_intf_to_hw(intf);
1227 struct zd_mac *mac;
1228 struct zd_usb *usb;
1229
1230 /* Either something really bad happened, or we're just dealing with
1231 * a DEVICE_INSTALLER. */
1232 if (hw == NULL)
1233 return;
1234
1235 mac = zd_hw_mac(hw);
1236 usb = &mac->chip.usb;
1237
1238 dev_dbg_f(zd_usb_dev(usb), "\n");
1239
1240 ieee80211_unregister_hw(hw);
1241
1242 /* Just in case something has gone wrong! */
1243 zd_usb_disable_rx(usb);
1244 zd_usb_disable_int(usb);
1245
1246 /* If the disconnect has been caused by a removal of the
1247 * driver module, the reset allows reloading of the driver. If the
1248 * reset will not be executed here, the upload of the firmware in the
1249 * probe function caused by the reloading of the driver will fail.
1250 */
1251 usb_reset_device(interface_to_usbdev(intf));
1252
1253 zd_mac_clear(mac);
1254 ieee80211_free_hw(hw);
1255 dev_dbg(&intf->dev, "disconnected\n");
1256 }
1257
1258 static struct usb_driver driver = {
1259 .name = KBUILD_MODNAME,
1260 .id_table = usb_ids,
1261 .probe = probe,
1262 .disconnect = disconnect,
1263 };
1264
1265 struct workqueue_struct *zd_workqueue;
1266
1267 static int __init usb_init(void)
1268 {
1269 int r;
1270
1271 pr_debug("%s usb_init()\n", driver.name);
1272
1273 zd_workqueue = create_singlethread_workqueue(driver.name);
1274 if (zd_workqueue == NULL) {
1275 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1276 return -ENOMEM;
1277 }
1278
1279 r = usb_register(&driver);
1280 if (r) {
1281 destroy_workqueue(zd_workqueue);
1282 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1283 driver.name, r);
1284 return r;
1285 }
1286
1287 pr_debug("%s initialized\n", driver.name);
1288 return 0;
1289 }
1290
1291 static void __exit usb_exit(void)
1292 {
1293 pr_debug("%s usb_exit()\n", driver.name);
1294 usb_deregister(&driver);
1295 destroy_workqueue(zd_workqueue);
1296 }
1297
1298 module_init(usb_init);
1299 module_exit(usb_exit);
1300
1301 static int usb_int_regs_length(unsigned int count)
1302 {
1303 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1304 }
1305
1306 static void prepare_read_regs_int(struct zd_usb *usb)
1307 {
1308 struct zd_usb_interrupt *intr = &usb->intr;
1309
1310 spin_lock_irq(&intr->lock);
1311 intr->read_regs_enabled = 1;
1312 INIT_COMPLETION(intr->read_regs.completion);
1313 spin_unlock_irq(&intr->lock);
1314 }
1315
1316 static void disable_read_regs_int(struct zd_usb *usb)
1317 {
1318 struct zd_usb_interrupt *intr = &usb->intr;
1319
1320 spin_lock_irq(&intr->lock);
1321 intr->read_regs_enabled = 0;
1322 spin_unlock_irq(&intr->lock);
1323 }
1324
1325 static int get_results(struct zd_usb *usb, u16 *values,
1326 struct usb_req_read_regs *req, unsigned int count)
1327 {
1328 int r;
1329 int i;
1330 struct zd_usb_interrupt *intr = &usb->intr;
1331 struct read_regs_int *rr = &intr->read_regs;
1332 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1333
1334 spin_lock_irq(&intr->lock);
1335
1336 r = -EIO;
1337 /* The created block size seems to be larger than expected.
1338 * However results appear to be correct.
1339 */
1340 if (rr->length < usb_int_regs_length(count)) {
1341 dev_dbg_f(zd_usb_dev(usb),
1342 "error: actual length %d less than expected %d\n",
1343 rr->length, usb_int_regs_length(count));
1344 goto error_unlock;
1345 }
1346 if (rr->length > sizeof(rr->buffer)) {
1347 dev_dbg_f(zd_usb_dev(usb),
1348 "error: actual length %d exceeds buffer size %zu\n",
1349 rr->length, sizeof(rr->buffer));
1350 goto error_unlock;
1351 }
1352
1353 for (i = 0; i < count; i++) {
1354 struct reg_data *rd = &regs->regs[i];
1355 if (rd->addr != req->addr[i]) {
1356 dev_dbg_f(zd_usb_dev(usb),
1357 "rd[%d] addr %#06hx expected %#06hx\n", i,
1358 le16_to_cpu(rd->addr),
1359 le16_to_cpu(req->addr[i]));
1360 goto error_unlock;
1361 }
1362 values[i] = le16_to_cpu(rd->value);
1363 }
1364
1365 r = 0;
1366 error_unlock:
1367 spin_unlock_irq(&intr->lock);
1368 return r;
1369 }
1370
1371 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1372 const zd_addr_t *addresses, unsigned int count)
1373 {
1374 int r;
1375 int i, req_len, actual_req_len;
1376 struct usb_device *udev;
1377 struct usb_req_read_regs *req = NULL;
1378 unsigned long timeout;
1379
1380 if (count < 1) {
1381 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1382 return -EINVAL;
1383 }
1384 if (count > USB_MAX_IOREAD16_COUNT) {
1385 dev_dbg_f(zd_usb_dev(usb),
1386 "error: count %u exceeds possible max %u\n",
1387 count, USB_MAX_IOREAD16_COUNT);
1388 return -EINVAL;
1389 }
1390 if (in_atomic()) {
1391 dev_dbg_f(zd_usb_dev(usb),
1392 "error: io in atomic context not supported\n");
1393 return -EWOULDBLOCK;
1394 }
1395 if (!usb_int_enabled(usb)) {
1396 dev_dbg_f(zd_usb_dev(usb),
1397 "error: usb interrupt not enabled\n");
1398 return -EWOULDBLOCK;
1399 }
1400
1401 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1402 req = kmalloc(req_len, GFP_KERNEL);
1403 if (!req)
1404 return -ENOMEM;
1405 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1406 for (i = 0; i < count; i++)
1407 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1408
1409 udev = zd_usb_to_usbdev(usb);
1410 prepare_read_regs_int(usb);
1411 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1412 req, req_len, &actual_req_len, 1000 /* ms */);
1413 if (r) {
1414 dev_dbg_f(zd_usb_dev(usb),
1415 "error in usb_bulk_msg(). Error number %d\n", r);
1416 goto error;
1417 }
1418 if (req_len != actual_req_len) {
1419 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1420 " req_len %d != actual_req_len %d\n",
1421 req_len, actual_req_len);
1422 r = -EIO;
1423 goto error;
1424 }
1425
1426 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1427 msecs_to_jiffies(1000));
1428 if (!timeout) {
1429 disable_read_regs_int(usb);
1430 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1431 r = -ETIMEDOUT;
1432 goto error;
1433 }
1434
1435 r = get_results(usb, values, req, count);
1436 error:
1437 kfree(req);
1438 return r;
1439 }
1440
1441 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1442 unsigned int count)
1443 {
1444 int r;
1445 struct usb_device *udev;
1446 struct usb_req_write_regs *req = NULL;
1447 int i, req_len, actual_req_len;
1448
1449 if (count == 0)
1450 return 0;
1451 if (count > USB_MAX_IOWRITE16_COUNT) {
1452 dev_dbg_f(zd_usb_dev(usb),
1453 "error: count %u exceeds possible max %u\n",
1454 count, USB_MAX_IOWRITE16_COUNT);
1455 return -EINVAL;
1456 }
1457 if (in_atomic()) {
1458 dev_dbg_f(zd_usb_dev(usb),
1459 "error: io in atomic context not supported\n");
1460 return -EWOULDBLOCK;
1461 }
1462
1463 req_len = sizeof(struct usb_req_write_regs) +
1464 count * sizeof(struct reg_data);
1465 req = kmalloc(req_len, GFP_KERNEL);
1466 if (!req)
1467 return -ENOMEM;
1468
1469 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1470 for (i = 0; i < count; i++) {
1471 struct reg_data *rw = &req->reg_writes[i];
1472 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1473 rw->value = cpu_to_le16(ioreqs[i].value);
1474 }
1475
1476 udev = zd_usb_to_usbdev(usb);
1477 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1478 req, req_len, &actual_req_len, 1000 /* ms */);
1479 if (r) {
1480 dev_dbg_f(zd_usb_dev(usb),
1481 "error in usb_bulk_msg(). Error number %d\n", r);
1482 goto error;
1483 }
1484 if (req_len != actual_req_len) {
1485 dev_dbg_f(zd_usb_dev(usb),
1486 "error in usb_bulk_msg()"
1487 " req_len %d != actual_req_len %d\n",
1488 req_len, actual_req_len);
1489 r = -EIO;
1490 goto error;
1491 }
1492
1493 /* FALL-THROUGH with r == 0 */
1494 error:
1495 kfree(req);
1496 return r;
1497 }
1498
1499 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1500 {
1501 int r;
1502 struct usb_device *udev;
1503 struct usb_req_rfwrite *req = NULL;
1504 int i, req_len, actual_req_len;
1505 u16 bit_value_template;
1506
1507 if (in_atomic()) {
1508 dev_dbg_f(zd_usb_dev(usb),
1509 "error: io in atomic context not supported\n");
1510 return -EWOULDBLOCK;
1511 }
1512 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1513 dev_dbg_f(zd_usb_dev(usb),
1514 "error: bits %d are smaller than"
1515 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1516 bits, USB_MIN_RFWRITE_BIT_COUNT);
1517 return -EINVAL;
1518 }
1519 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1520 dev_dbg_f(zd_usb_dev(usb),
1521 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1522 bits, USB_MAX_RFWRITE_BIT_COUNT);
1523 return -EINVAL;
1524 }
1525 #ifdef DEBUG
1526 if (value & (~0UL << bits)) {
1527 dev_dbg_f(zd_usb_dev(usb),
1528 "error: value %#09x has bits >= %d set\n",
1529 value, bits);
1530 return -EINVAL;
1531 }
1532 #endif /* DEBUG */
1533
1534 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1535
1536 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1537 if (r) {
1538 dev_dbg_f(zd_usb_dev(usb),
1539 "error %d: Couldn't read CR203\n", r);
1540 goto out;
1541 }
1542 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1543
1544 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1545 req = kmalloc(req_len, GFP_KERNEL);
1546 if (!req)
1547 return -ENOMEM;
1548
1549 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1550 /* 1: 3683a, but not used in ZYDAS driver */
1551 req->value = cpu_to_le16(2);
1552 req->bits = cpu_to_le16(bits);
1553
1554 for (i = 0; i < bits; i++) {
1555 u16 bv = bit_value_template;
1556 if (value & (1 << (bits-1-i)))
1557 bv |= RF_DATA;
1558 req->bit_values[i] = cpu_to_le16(bv);
1559 }
1560
1561 udev = zd_usb_to_usbdev(usb);
1562 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1563 req, req_len, &actual_req_len, 1000 /* ms */);
1564 if (r) {
1565 dev_dbg_f(zd_usb_dev(usb),
1566 "error in usb_bulk_msg(). Error number %d\n", r);
1567 goto out;
1568 }
1569 if (req_len != actual_req_len) {
1570 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1571 " req_len %d != actual_req_len %d\n",
1572 req_len, actual_req_len);
1573 r = -EIO;
1574 goto out;
1575 }
1576
1577 /* FALL-THROUGH with r == 0 */
1578 out:
1579 kfree(req);
1580 return r;
1581 }
linux-next