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zd1211rw: use stack and preallocated memory for small cmd-buffers
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / wireless / zd1211rw / zd_usb.c
blobbf1de04dc9f2ff7c4935f543dcfcedc74540f7de
1 /* ZD1211 USB-WLAN driver for Linux
2 *
3 * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
4 * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
5 * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 #include <linux/kernel.h>
23 #include <linux/init.h>
24 #include <linux/firmware.h>
25 #include <linux/device.h>
26 #include <linux/errno.h>
27 #include <linux/slab.h>
28 #include <linux/skbuff.h>
29 #include <linux/usb.h>
30 #include <linux/workqueue.h>
31 #include <net/mac80211.h>
32 #include <asm/unaligned.h>
33
34 #include "zd_def.h"
35 #include "zd_mac.h"
36 #include "zd_usb.h"
37
38 static struct usb_device_id usb_ids[] = {
39 /* ZD1211 */
40 { USB_DEVICE(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 },
41 { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
42 { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
43 { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
44 { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
45 { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
46 { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
47 { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
48 { USB_DEVICE(0x0ace, 0xa211), .driver_info = DEVICE_ZD1211 },
49 { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
50 { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
51 { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
52 { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
53 { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
54 { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
55 { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 },
56 { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
57 { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
58 { USB_DEVICE(0x14ea, 0xab10), .driver_info = DEVICE_ZD1211 },
59 { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
60 { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
61 { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
62 { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
63 { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
64 { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
65 /* ZD1211B */
66 { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
67 { USB_DEVICE(0x0409, 0x0248), .driver_info = DEVICE_ZD1211B },
68 { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
69 { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
70 { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
71 { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
72 { USB_DEVICE(0x054c, 0x0257), .driver_info = DEVICE_ZD1211B },
73 { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
74 { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
75 { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
76 { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
77 { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
78 { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
79 { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211B },
80 { USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B },
81 { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
82 { USB_DEVICE(0x083a, 0xe501), .driver_info = DEVICE_ZD1211B },
83 { USB_DEVICE(0x083a, 0xe503), .driver_info = DEVICE_ZD1211B },
84 { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
85 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
86 { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B },
87 { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
88 { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
89 { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
90 { USB_DEVICE(0x0df6, 0x0036), .driver_info = DEVICE_ZD1211B },
91 { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
92 { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
93 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
94 { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
95 { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
96 { USB_DEVICE(0x2019, 0xed01), .driver_info = DEVICE_ZD1211B },
97 /* "Driverless" devices that need ejecting */
98 { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
99 { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
100 {}
101 };
102
103 MODULE_LICENSE("GPL");
104 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
105 MODULE_AUTHOR("Ulrich Kunitz");
106 MODULE_AUTHOR("Daniel Drake");
107 MODULE_VERSION("1.0");
108 MODULE_DEVICE_TABLE(usb, usb_ids);
109
110 #define FW_ZD1211_PREFIX "zd1211/zd1211_"
111 #define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
112
113 /* USB device initialization */
114 static void int_urb_complete(struct urb *urb);
115
116 static int request_fw_file(
117 const struct firmware **fw, const char *name, struct device *device)
118 {
119 int r;
120
121 dev_dbg_f(device, "fw name %s\n", name);
122
123 r = request_firmware(fw, name, device);
124 if (r)
125 dev_err(device,
126 "Could not load firmware file %s. Error number %d\n",
127 name, r);
128 return r;
129 }
130
131 static inline u16 get_bcdDevice(const struct usb_device *udev)
132 {
133 return le16_to_cpu(udev->descriptor.bcdDevice);
134 }
135
136 enum upload_code_flags {
137 REBOOT = 1,
138 };
139
140 /* Ensures that MAX_TRANSFER_SIZE is even. */
141 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
142
143 static int upload_code(struct usb_device *udev,
144 const u8 *data, size_t size, u16 code_offset, int flags)
145 {
146 u8 *p;
147 int r;
148
149 /* USB request blocks need "kmalloced" buffers.
150 */
151 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
152 if (!p) {
153 dev_err(&udev->dev, "out of memory\n");
154 r = -ENOMEM;
155 goto error;
156 }
157
158 size &= ~1;
159 while (size > 0) {
160 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
161 size : MAX_TRANSFER_SIZE;
162
163 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
164
165 memcpy(p, data, transfer_size);
166 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
167 USB_REQ_FIRMWARE_DOWNLOAD,
168 USB_DIR_OUT | USB_TYPE_VENDOR,
169 code_offset, 0, p, transfer_size, 1000 /* ms */);
170 if (r < 0) {
171 dev_err(&udev->dev,
172 "USB control request for firmware upload"
173 " failed. Error number %d\n", r);
174 goto error;
175 }
176 transfer_size = r & ~1;
177
178 size -= transfer_size;
179 data += transfer_size;
180 code_offset += transfer_size/sizeof(u16);
181 }
182
183 if (flags & REBOOT) {
184 u8 ret;
185
186 /* Use "DMA-aware" buffer. */
187 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
188 USB_REQ_FIRMWARE_CONFIRM,
189 USB_DIR_IN | USB_TYPE_VENDOR,
190 0, 0, p, sizeof(ret), 5000 /* ms */);
191 if (r != sizeof(ret)) {
192 dev_err(&udev->dev,
193 "control request firmeware confirmation failed."
194 " Return value %d\n", r);
195 if (r >= 0)
196 r = -ENODEV;
197 goto error;
198 }
199 ret = p[0];
200 if (ret & 0x80) {
201 dev_err(&udev->dev,
202 "Internal error while downloading."
203 " Firmware confirm return value %#04x\n",
204 (unsigned int)ret);
205 r = -ENODEV;
206 goto error;
207 }
208 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
209 (unsigned int)ret);
210 }
211
212 r = 0;
213 error:
214 kfree(p);
215 return r;
216 }
217
218 static u16 get_word(const void *data, u16 offset)
219 {
220 const __le16 *p = data;
221 return le16_to_cpu(p[offset]);
222 }
223
224 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
225 const char* postfix)
226 {
227 scnprintf(buffer, size, "%s%s",
228 usb->is_zd1211b ?
229 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
230 postfix);
231 return buffer;
232 }
233
234 static int handle_version_mismatch(struct zd_usb *usb,
235 const struct firmware *ub_fw)
236 {
237 struct usb_device *udev = zd_usb_to_usbdev(usb);
238 const struct firmware *ur_fw = NULL;
239 int offset;
240 int r = 0;
241 char fw_name[128];
242
243 r = request_fw_file(&ur_fw,
244 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
245 &udev->dev);
246 if (r)
247 goto error;
248
249 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
250 if (r)
251 goto error;
252
253 offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
254 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
255 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
256
257 /* At this point, the vendor driver downloads the whole firmware
258 * image, hacks around with version IDs, and uploads it again,
259 * completely overwriting the boot code. We do not do this here as
260 * it is not required on any tested devices, and it is suspected to
261 * cause problems. */
262 error:
263 release_firmware(ur_fw);
264 return r;
265 }
266
267 static int upload_firmware(struct zd_usb *usb)
268 {
269 int r;
270 u16 fw_bcdDevice;
271 u16 bcdDevice;
272 struct usb_device *udev = zd_usb_to_usbdev(usb);
273 const struct firmware *ub_fw = NULL;
274 const struct firmware *uph_fw = NULL;
275 char fw_name[128];
276
277 bcdDevice = get_bcdDevice(udev);
278
279 r = request_fw_file(&ub_fw,
280 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
281 &udev->dev);
282 if (r)
283 goto error;
284
285 fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
286
287 if (fw_bcdDevice != bcdDevice) {
288 dev_info(&udev->dev,
289 "firmware version %#06x and device bootcode version "
290 "%#06x differ\n", fw_bcdDevice, bcdDevice);
291 if (bcdDevice <= 0x4313)
292 dev_warn(&udev->dev, "device has old bootcode, please "
293 "report success or failure\n");
294
295 r = handle_version_mismatch(usb, ub_fw);
296 if (r)
297 goto error;
298 } else {
299 dev_dbg_f(&udev->dev,
300 "firmware device id %#06x is equal to the "
301 "actual device id\n", fw_bcdDevice);
302 }
303
304
305 r = request_fw_file(&uph_fw,
306 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
307 &udev->dev);
308 if (r)
309 goto error;
310
311 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
312 if (r) {
313 dev_err(&udev->dev,
314 "Could not upload firmware code uph. Error number %d\n",
315 r);
316 }
317
318 /* FALL-THROUGH */
319 error:
320 release_firmware(ub_fw);
321 release_firmware(uph_fw);
322 return r;
323 }
324
325 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ur");
326 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ur");
327 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ub");
328 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ub");
329 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "uphr");
330 MODULE_FIRMWARE(FW_ZD1211_PREFIX "uphr");
331
332 /* Read data from device address space using "firmware interface" which does
333 * not require firmware to be loaded. */
334 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
335 {
336 int r;
337 struct usb_device *udev = zd_usb_to_usbdev(usb);
338 u8 *buf;
339
340 /* Use "DMA-aware" buffer. */
341 buf = kmalloc(len, GFP_KERNEL);
342 if (!buf)
343 return -ENOMEM;
344 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
345 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
346 buf, len, 5000);
347 if (r < 0) {
348 dev_err(&udev->dev,
349 "read over firmware interface failed: %d\n", r);
350 goto exit;
351 } else if (r != len) {
352 dev_err(&udev->dev,
353 "incomplete read over firmware interface: %d/%d\n",
354 r, len);
355 r = -EIO;
356 goto exit;
357 }
358 r = 0;
359 memcpy(data, buf, len);
360 exit:
361 kfree(buf);
362 return r;
363 }
364
365 #define urb_dev(urb) (&(urb)->dev->dev)
366
367 static inline void handle_regs_int(struct urb *urb)
368 {
369 struct zd_usb *usb = urb->context;
370 struct zd_usb_interrupt *intr = &usb->intr;
371 int len;
372 u16 int_num;
373
374 ZD_ASSERT(in_interrupt());
375 spin_lock(&intr->lock);
376
377 int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
378 if (int_num == CR_INTERRUPT) {
379 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
380 spin_lock(&mac->lock);
381 memcpy(&mac->intr_buffer, urb->transfer_buffer,
382 USB_MAX_EP_INT_BUFFER);
383 spin_unlock(&mac->lock);
384 schedule_work(&mac->process_intr);
385 } else if (intr->read_regs_enabled) {
386 intr->read_regs.length = len = urb->actual_length;
387
388 if (len > sizeof(intr->read_regs.buffer))
389 len = sizeof(intr->read_regs.buffer);
390 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
391 intr->read_regs_enabled = 0;
392 complete(&intr->read_regs.completion);
393 goto out;
394 }
395
396 out:
397 spin_unlock(&intr->lock);
398 }
399
400 static void int_urb_complete(struct urb *urb)
401 {
402 int r;
403 struct usb_int_header *hdr;
404
405 switch (urb->status) {
406 case 0:
407 break;
408 case -ESHUTDOWN:
409 case -EINVAL:
410 case -ENODEV:
411 case -ENOENT:
412 case -ECONNRESET:
413 case -EPIPE:
414 goto kfree;
415 default:
416 goto resubmit;
417 }
418
419 if (urb->actual_length < sizeof(hdr)) {
420 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
421 goto resubmit;
422 }
423
424 hdr = urb->transfer_buffer;
425 if (hdr->type != USB_INT_TYPE) {
426 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
427 goto resubmit;
428 }
429
430 switch (hdr->id) {
431 case USB_INT_ID_REGS:
432 handle_regs_int(urb);
433 break;
434 case USB_INT_ID_RETRY_FAILED:
435 zd_mac_tx_failed(urb);
436 break;
437 default:
438 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
439 (unsigned int)hdr->id);
440 goto resubmit;
441 }
442
443 resubmit:
444 r = usb_submit_urb(urb, GFP_ATOMIC);
445 if (r) {
446 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
447 goto kfree;
448 }
449 return;
450 kfree:
451 kfree(urb->transfer_buffer);
452 }
453
454 static inline int int_urb_interval(struct usb_device *udev)
455 {
456 switch (udev->speed) {
457 case USB_SPEED_HIGH:
458 return 4;
459 case USB_SPEED_LOW:
460 return 10;
461 case USB_SPEED_FULL:
462 default:
463 return 1;
464 }
465 }
466
467 static inline int usb_int_enabled(struct zd_usb *usb)
468 {
469 unsigned long flags;
470 struct zd_usb_interrupt *intr = &usb->intr;
471 struct urb *urb;
472
473 spin_lock_irqsave(&intr->lock, flags);
474 urb = intr->urb;
475 spin_unlock_irqrestore(&intr->lock, flags);
476 return urb != NULL;
477 }
478
479 int zd_usb_enable_int(struct zd_usb *usb)
480 {
481 int r;
482 struct usb_device *udev;
483 struct zd_usb_interrupt *intr = &usb->intr;
484 void *transfer_buffer = NULL;
485 struct urb *urb;
486
487 dev_dbg_f(zd_usb_dev(usb), "\n");
488
489 urb = usb_alloc_urb(0, GFP_KERNEL);
490 if (!urb) {
491 r = -ENOMEM;
492 goto out;
493 }
494
495 ZD_ASSERT(!irqs_disabled());
496 spin_lock_irq(&intr->lock);
497 if (intr->urb) {
498 spin_unlock_irq(&intr->lock);
499 r = 0;
500 goto error_free_urb;
501 }
502 intr->urb = urb;
503 spin_unlock_irq(&intr->lock);
504
505 /* TODO: make it a DMA buffer */
506 r = -ENOMEM;
507 transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
508 if (!transfer_buffer) {
509 dev_dbg_f(zd_usb_dev(usb),
510 "couldn't allocate transfer_buffer\n");
511 goto error_set_urb_null;
512 }
513
514 udev = zd_usb_to_usbdev(usb);
515 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
516 transfer_buffer, USB_MAX_EP_INT_BUFFER,
517 int_urb_complete, usb,
518 intr->interval);
519
520 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
521 r = usb_submit_urb(urb, GFP_KERNEL);
522 if (r) {
523 dev_dbg_f(zd_usb_dev(usb),
524 "Couldn't submit urb. Error number %d\n", r);
525 goto error;
526 }
527
528 return 0;
529 error:
530 kfree(transfer_buffer);
531 error_set_urb_null:
532 spin_lock_irq(&intr->lock);
533 intr->urb = NULL;
534 spin_unlock_irq(&intr->lock);
535 error_free_urb:
536 usb_free_urb(urb);
537 out:
538 return r;
539 }
540
541 void zd_usb_disable_int(struct zd_usb *usb)
542 {
543 unsigned long flags;
544 struct zd_usb_interrupt *intr = &usb->intr;
545 struct urb *urb;
546
547 spin_lock_irqsave(&intr->lock, flags);
548 urb = intr->urb;
549 if (!urb) {
550 spin_unlock_irqrestore(&intr->lock, flags);
551 return;
552 }
553 intr->urb = NULL;
554 spin_unlock_irqrestore(&intr->lock, flags);
555
556 usb_kill_urb(urb);
557 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
558 usb_free_urb(urb);
559 }
560
561 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
562 unsigned int length)
563 {
564 int i;
565 const struct rx_length_info *length_info;
566
567 if (length < sizeof(struct rx_length_info)) {
568 /* It's not a complete packet anyhow. */
569 printk("%s: invalid, small RX packet : %d\n",
570 __func__, length);
571 return;
572 }
573 length_info = (struct rx_length_info *)
574 (buffer + length - sizeof(struct rx_length_info));
575
576 /* It might be that three frames are merged into a single URB
577 * transaction. We have to check for the length info tag.
578 *
579 * While testing we discovered that length_info might be unaligned,
580 * because if USB transactions are merged, the last packet will not
581 * be padded. Unaligned access might also happen if the length_info
582 * structure is not present.
583 */
584 if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
585 {
586 unsigned int l, k, n;
587 for (i = 0, l = 0;; i++) {
588 k = get_unaligned_le16(&length_info->length[i]);
589 if (k == 0)
590 return;
591 n = l+k;
592 if (n > length)
593 return;
594 zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
595 if (i >= 2)
596 return;
597 l = (n+3) & ~3;
598 }
599 } else {
600 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
601 }
602 }
603
604 static void rx_urb_complete(struct urb *urb)
605 {
606 struct zd_usb *usb;
607 struct zd_usb_rx *rx;
608 const u8 *buffer;
609 unsigned int length;
610
611 switch (urb->status) {
612 case 0:
613 break;
614 case -ESHUTDOWN:
615 case -EINVAL:
616 case -ENODEV:
617 case -ENOENT:
618 case -ECONNRESET:
619 case -EPIPE:
620 return;
621 default:
622 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
623 goto resubmit;
624 }
625
626 buffer = urb->transfer_buffer;
627 length = urb->actual_length;
628 usb = urb->context;
629 rx = &usb->rx;
630
631 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
632 /* If there is an old first fragment, we don't care. */
633 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
634 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
635 spin_lock(&rx->lock);
636 memcpy(rx->fragment, buffer, length);
637 rx->fragment_length = length;
638 spin_unlock(&rx->lock);
639 goto resubmit;
640 }
641
642 spin_lock(&rx->lock);
643 if (rx->fragment_length > 0) {
644 /* We are on a second fragment, we believe */
645 ZD_ASSERT(length + rx->fragment_length <=
646 ARRAY_SIZE(rx->fragment));
647 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
648 memcpy(rx->fragment+rx->fragment_length, buffer, length);
649 handle_rx_packet(usb, rx->fragment,
650 rx->fragment_length + length);
651 rx->fragment_length = 0;
652 spin_unlock(&rx->lock);
653 } else {
654 spin_unlock(&rx->lock);
655 handle_rx_packet(usb, buffer, length);
656 }
657
658 resubmit:
659 usb_submit_urb(urb, GFP_ATOMIC);
660 }
661
662 static struct urb *alloc_rx_urb(struct zd_usb *usb)
663 {
664 struct usb_device *udev = zd_usb_to_usbdev(usb);
665 struct urb *urb;
666 void *buffer;
667
668 urb = usb_alloc_urb(0, GFP_KERNEL);
669 if (!urb)
670 return NULL;
671 buffer = usb_alloc_coherent(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
672 &urb->transfer_dma);
673 if (!buffer) {
674 usb_free_urb(urb);
675 return NULL;
676 }
677
678 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
679 buffer, USB_MAX_RX_SIZE,
680 rx_urb_complete, usb);
681 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
682
683 return urb;
684 }
685
686 static void free_rx_urb(struct urb *urb)
687 {
688 if (!urb)
689 return;
690 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
691 urb->transfer_buffer, urb->transfer_dma);
692 usb_free_urb(urb);
693 }
694
695 int zd_usb_enable_rx(struct zd_usb *usb)
696 {
697 int i, r;
698 struct zd_usb_rx *rx = &usb->rx;
699 struct urb **urbs;
700
701 dev_dbg_f(zd_usb_dev(usb), "\n");
702
703 r = -ENOMEM;
704 urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
705 if (!urbs)
706 goto error;
707 for (i = 0; i < RX_URBS_COUNT; i++) {
708 urbs[i] = alloc_rx_urb(usb);
709 if (!urbs[i])
710 goto error;
711 }
712
713 ZD_ASSERT(!irqs_disabled());
714 spin_lock_irq(&rx->lock);
715 if (rx->urbs) {
716 spin_unlock_irq(&rx->lock);
717 r = 0;
718 goto error;
719 }
720 rx->urbs = urbs;
721 rx->urbs_count = RX_URBS_COUNT;
722 spin_unlock_irq(&rx->lock);
723
724 for (i = 0; i < RX_URBS_COUNT; i++) {
725 r = usb_submit_urb(urbs[i], GFP_KERNEL);
726 if (r)
727 goto error_submit;
728 }
729
730 return 0;
731 error_submit:
732 for (i = 0; i < RX_URBS_COUNT; i++) {
733 usb_kill_urb(urbs[i]);
734 }
735 spin_lock_irq(&rx->lock);
736 rx->urbs = NULL;
737 rx->urbs_count = 0;
738 spin_unlock_irq(&rx->lock);
739 error:
740 if (urbs) {
741 for (i = 0; i < RX_URBS_COUNT; i++)
742 free_rx_urb(urbs[i]);
743 }
744 return r;
745 }
746
747 void zd_usb_disable_rx(struct zd_usb *usb)
748 {
749 int i;
750 unsigned long flags;
751 struct urb **urbs;
752 unsigned int count;
753 struct zd_usb_rx *rx = &usb->rx;
754
755 spin_lock_irqsave(&rx->lock, flags);
756 urbs = rx->urbs;
757 count = rx->urbs_count;
758 spin_unlock_irqrestore(&rx->lock, flags);
759 if (!urbs)
760 return;
761
762 for (i = 0; i < count; i++) {
763 usb_kill_urb(urbs[i]);
764 free_rx_urb(urbs[i]);
765 }
766 kfree(urbs);
767
768 spin_lock_irqsave(&rx->lock, flags);
769 rx->urbs = NULL;
770 rx->urbs_count = 0;
771 spin_unlock_irqrestore(&rx->lock, flags);
772 }
773
774 /**
775 * zd_usb_disable_tx - disable transmission
776 * @usb: the zd1211rw-private USB structure
777 *
778 * Frees all URBs in the free list and marks the transmission as disabled.
779 */
780 void zd_usb_disable_tx(struct zd_usb *usb)
781 {
782 struct zd_usb_tx *tx = &usb->tx;
783 unsigned long flags;
784
785 atomic_set(&tx->enabled, 0);
786
787 /* kill all submitted tx-urbs */
788 usb_kill_anchored_urbs(&tx->submitted);
789
790 spin_lock_irqsave(&tx->lock, flags);
791 WARN_ON(tx->submitted_urbs != 0);
792 tx->submitted_urbs = 0;
793 spin_unlock_irqrestore(&tx->lock, flags);
794
795 /* The stopped state is ignored, relying on ieee80211_wake_queues()
796 * in a potentionally following zd_usb_enable_tx().
797 */
798 }
799
800 /**
801 * zd_usb_enable_tx - enables transmission
802 * @usb: a &struct zd_usb pointer
803 *
804 * This function enables transmission and prepares the &zd_usb_tx data
805 * structure.
806 */
807 void zd_usb_enable_tx(struct zd_usb *usb)
808 {
809 unsigned long flags;
810 struct zd_usb_tx *tx = &usb->tx;
811
812 spin_lock_irqsave(&tx->lock, flags);
813 atomic_set(&tx->enabled, 1);
814 tx->submitted_urbs = 0;
815 ieee80211_wake_queues(zd_usb_to_hw(usb));
816 tx->stopped = 0;
817 spin_unlock_irqrestore(&tx->lock, flags);
818 }
819
820 static void tx_dec_submitted_urbs(struct zd_usb *usb)
821 {
822 struct zd_usb_tx *tx = &usb->tx;
823 unsigned long flags;
824
825 spin_lock_irqsave(&tx->lock, flags);
826 --tx->submitted_urbs;
827 if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
828 ieee80211_wake_queues(zd_usb_to_hw(usb));
829 tx->stopped = 0;
830 }
831 spin_unlock_irqrestore(&tx->lock, flags);
832 }
833
834 static void tx_inc_submitted_urbs(struct zd_usb *usb)
835 {
836 struct zd_usb_tx *tx = &usb->tx;
837 unsigned long flags;
838
839 spin_lock_irqsave(&tx->lock, flags);
840 ++tx->submitted_urbs;
841 if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
842 ieee80211_stop_queues(zd_usb_to_hw(usb));
843 tx->stopped = 1;
844 }
845 spin_unlock_irqrestore(&tx->lock, flags);
846 }
847
848 /**
849 * tx_urb_complete - completes the execution of an URB
850 * @urb: a URB
851 *
852 * This function is called if the URB has been transferred to a device or an
853 * error has happened.
854 */
855 static void tx_urb_complete(struct urb *urb)
856 {
857 int r;
858 struct sk_buff *skb;
859 struct ieee80211_tx_info *info;
860 struct zd_usb *usb;
861 struct zd_usb_tx *tx;
862
863 skb = (struct sk_buff *)urb->context;
864 info = IEEE80211_SKB_CB(skb);
865 /*
866 * grab 'usb' pointer before handing off the skb (since
867 * it might be freed by zd_mac_tx_to_dev or mac80211)
868 */
869 usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb;
870 tx = &usb->tx;
871
872 switch (urb->status) {
873 case 0:
874 break;
875 case -ESHUTDOWN:
876 case -EINVAL:
877 case -ENODEV:
878 case -ENOENT:
879 case -ECONNRESET:
880 case -EPIPE:
881 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
882 break;
883 default:
884 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
885 goto resubmit;
886 }
887 free_urb:
888 zd_mac_tx_to_dev(skb, urb->status);
889 usb_free_urb(urb);
890 tx_dec_submitted_urbs(usb);
891 return;
892 resubmit:
893 usb_anchor_urb(urb, &tx->submitted);
894 r = usb_submit_urb(urb, GFP_ATOMIC);
895 if (r) {
896 usb_unanchor_urb(urb);
897 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
898 goto free_urb;
899 }
900 }
901
902 /**
903 * zd_usb_tx: initiates transfer of a frame of the device
904 *
905 * @usb: the zd1211rw-private USB structure
906 * @skb: a &struct sk_buff pointer
907 *
908 * This function tranmits a frame to the device. It doesn't wait for
909 * completion. The frame must contain the control set and have all the
910 * control set information available.
911 *
912 * The function returns 0 if the transfer has been successfully initiated.
913 */
914 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
915 {
916 int r;
917 struct usb_device *udev = zd_usb_to_usbdev(usb);
918 struct urb *urb;
919 struct zd_usb_tx *tx = &usb->tx;
920
921 if (!atomic_read(&tx->enabled)) {
922 r = -ENOENT;
923 goto out;
924 }
925
926 urb = usb_alloc_urb(0, GFP_ATOMIC);
927 if (!urb) {
928 r = -ENOMEM;
929 goto out;
930 }
931
932 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
933 skb->data, skb->len, tx_urb_complete, skb);
934
935 usb_anchor_urb(urb, &tx->submitted);
936 r = usb_submit_urb(urb, GFP_ATOMIC);
937 if (r) {
938 usb_unanchor_urb(urb);
939 goto error;
940 }
941 tx_inc_submitted_urbs(usb);
942 return 0;
943 error:
944 usb_free_urb(urb);
945 out:
946 return r;
947 }
948
949 static inline void init_usb_interrupt(struct zd_usb *usb)
950 {
951 struct zd_usb_interrupt *intr = &usb->intr;
952
953 spin_lock_init(&intr->lock);
954 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
955 init_completion(&intr->read_regs.completion);
956 intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
957 }
958
959 static inline void init_usb_rx(struct zd_usb *usb)
960 {
961 struct zd_usb_rx *rx = &usb->rx;
962 spin_lock_init(&rx->lock);
963 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
964 rx->usb_packet_size = 512;
965 } else {
966 rx->usb_packet_size = 64;
967 }
968 ZD_ASSERT(rx->fragment_length == 0);
969 }
970
971 static inline void init_usb_tx(struct zd_usb *usb)
972 {
973 struct zd_usb_tx *tx = &usb->tx;
974 spin_lock_init(&tx->lock);
975 atomic_set(&tx->enabled, 0);
976 tx->stopped = 0;
977 init_usb_anchor(&tx->submitted);
978 tx->submitted_urbs = 0;
979 }
980
981 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
982 struct usb_interface *intf)
983 {
984 memset(usb, 0, sizeof(*usb));
985 usb->intf = usb_get_intf(intf);
986 usb_set_intfdata(usb->intf, hw);
987 init_usb_interrupt(usb);
988 init_usb_tx(usb);
989 init_usb_rx(usb);
990 }
991
992 void zd_usb_clear(struct zd_usb *usb)
993 {
994 usb_set_intfdata(usb->intf, NULL);
995 usb_put_intf(usb->intf);
996 ZD_MEMCLEAR(usb, sizeof(*usb));
997 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
998 }
999
1000 static const char *speed(enum usb_device_speed speed)
1001 {
1002 switch (speed) {
1003 case USB_SPEED_LOW:
1004 return "low";
1005 case USB_SPEED_FULL:
1006 return "full";
1007 case USB_SPEED_HIGH:
1008 return "high";
1009 default:
1010 return "unknown speed";
1011 }
1012 }
1013
1014 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1015 {
1016 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1017 le16_to_cpu(udev->descriptor.idVendor),
1018 le16_to_cpu(udev->descriptor.idProduct),
1019 get_bcdDevice(udev),
1020 speed(udev->speed));
1021 }
1022
1023 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1024 {
1025 struct usb_device *udev = interface_to_usbdev(usb->intf);
1026 return scnprint_id(udev, buffer, size);
1027 }
1028
1029 #ifdef DEBUG
1030 static void print_id(struct usb_device *udev)
1031 {
1032 char buffer[40];
1033
1034 scnprint_id(udev, buffer, sizeof(buffer));
1035 buffer[sizeof(buffer)-1] = 0;
1036 dev_dbg_f(&udev->dev, "%s\n", buffer);
1037 }
1038 #else
1039 #define print_id(udev) do { } while (0)
1040 #endif
1041
1042 static int eject_installer(struct usb_interface *intf)
1043 {
1044 struct usb_device *udev = interface_to_usbdev(intf);
1045 struct usb_host_interface *iface_desc = &intf->altsetting[0];
1046 struct usb_endpoint_descriptor *endpoint;
1047 unsigned char *cmd;
1048 u8 bulk_out_ep;
1049 int r;
1050
1051 /* Find bulk out endpoint */
1052 for (r = 1; r >= 0; r--) {
1053 endpoint = &iface_desc->endpoint[r].desc;
1054 if (usb_endpoint_dir_out(endpoint) &&
1055 usb_endpoint_xfer_bulk(endpoint)) {
1056 bulk_out_ep = endpoint->bEndpointAddress;
1057 break;
1058 }
1059 }
1060 if (r == -1) {
1061 dev_err(&udev->dev,
1062 "zd1211rw: Could not find bulk out endpoint\n");
1063 return -ENODEV;
1064 }
1065
1066 cmd = kzalloc(31, GFP_KERNEL);
1067 if (cmd == NULL)
1068 return -ENODEV;
1069
1070 /* USB bulk command block */
1071 cmd[0] = 0x55; /* bulk command signature */
1072 cmd[1] = 0x53; /* bulk command signature */
1073 cmd[2] = 0x42; /* bulk command signature */
1074 cmd[3] = 0x43; /* bulk command signature */
1075 cmd[14] = 6; /* command length */
1076
1077 cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1078 cmd[19] = 0x2; /* eject disc */
1079
1080 dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1081 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1082 cmd, 31, NULL, 2000);
1083 kfree(cmd);
1084 if (r)
1085 return r;
1086
1087 /* At this point, the device disconnects and reconnects with the real
1088 * ID numbers. */
1089
1090 usb_set_intfdata(intf, NULL);
1091 return 0;
1092 }
1093
1094 int zd_usb_init_hw(struct zd_usb *usb)
1095 {
1096 int r;
1097 struct zd_mac *mac = zd_usb_to_mac(usb);
1098
1099 dev_dbg_f(zd_usb_dev(usb), "\n");
1100
1101 r = upload_firmware(usb);
1102 if (r) {
1103 dev_err(zd_usb_dev(usb),
1104 "couldn't load firmware. Error number %d\n", r);
1105 return r;
1106 }
1107
1108 r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1109 if (r) {
1110 dev_dbg_f(zd_usb_dev(usb),
1111 "couldn't reset configuration. Error number %d\n", r);
1112 return r;
1113 }
1114
1115 r = zd_mac_init_hw(mac->hw);
1116 if (r) {
1117 dev_dbg_f(zd_usb_dev(usb),
1118 "couldn't initialize mac. Error number %d\n", r);
1119 return r;
1120 }
1121
1122 usb->initialized = 1;
1123 return 0;
1124 }
1125
1126 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1127 {
1128 int r;
1129 struct usb_device *udev = interface_to_usbdev(intf);
1130 struct zd_usb *usb;
1131 struct ieee80211_hw *hw = NULL;
1132
1133 print_id(udev);
1134
1135 if (id->driver_info & DEVICE_INSTALLER)
1136 return eject_installer(intf);
1137
1138 switch (udev->speed) {
1139 case USB_SPEED_LOW:
1140 case USB_SPEED_FULL:
1141 case USB_SPEED_HIGH:
1142 break;
1143 default:
1144 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1145 r = -ENODEV;
1146 goto error;
1147 }
1148
1149 r = usb_reset_device(udev);
1150 if (r) {
1151 dev_err(&intf->dev,
1152 "couldn't reset usb device. Error number %d\n", r);
1153 goto error;
1154 }
1155
1156 hw = zd_mac_alloc_hw(intf);
1157 if (hw == NULL) {
1158 r = -ENOMEM;
1159 goto error;
1160 }
1161
1162 usb = &zd_hw_mac(hw)->chip.usb;
1163 usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1164
1165 r = zd_mac_preinit_hw(hw);
1166 if (r) {
1167 dev_dbg_f(&intf->dev,
1168 "couldn't initialize mac. Error number %d\n", r);
1169 goto error;
1170 }
1171
1172 r = ieee80211_register_hw(hw);
1173 if (r) {
1174 dev_dbg_f(&intf->dev,
1175 "couldn't register device. Error number %d\n", r);
1176 goto error;
1177 }
1178
1179 dev_dbg_f(&intf->dev, "successful\n");
1180 dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
1181 return 0;
1182 error:
1183 usb_reset_device(interface_to_usbdev(intf));
1184 if (hw) {
1185 zd_mac_clear(zd_hw_mac(hw));
1186 ieee80211_free_hw(hw);
1187 }
1188 return r;
1189 }
1190
1191 static void disconnect(struct usb_interface *intf)
1192 {
1193 struct ieee80211_hw *hw = zd_intf_to_hw(intf);
1194 struct zd_mac *mac;
1195 struct zd_usb *usb;
1196
1197 /* Either something really bad happened, or we're just dealing with
1198 * a DEVICE_INSTALLER. */
1199 if (hw == NULL)
1200 return;
1201
1202 mac = zd_hw_mac(hw);
1203 usb = &mac->chip.usb;
1204
1205 dev_dbg_f(zd_usb_dev(usb), "\n");
1206
1207 ieee80211_unregister_hw(hw);
1208
1209 /* Just in case something has gone wrong! */
1210 zd_usb_disable_tx(usb);
1211 zd_usb_disable_rx(usb);
1212 zd_usb_disable_int(usb);
1213
1214 /* If the disconnect has been caused by a removal of the
1215 * driver module, the reset allows reloading of the driver. If the
1216 * reset will not be executed here, the upload of the firmware in the
1217 * probe function caused by the reloading of the driver will fail.
1218 */
1219 usb_reset_device(interface_to_usbdev(intf));
1220
1221 zd_mac_clear(mac);
1222 ieee80211_free_hw(hw);
1223 dev_dbg(&intf->dev, "disconnected\n");
1224 }
1225
1226 static struct usb_driver driver = {
1227 .name = KBUILD_MODNAME,
1228 .id_table = usb_ids,
1229 .probe = probe,
1230 .disconnect = disconnect,
1231 };
1232
1233 struct workqueue_struct *zd_workqueue;
1234
1235 static int __init usb_init(void)
1236 {
1237 int r;
1238
1239 pr_debug("%s usb_init()\n", driver.name);
1240
1241 zd_workqueue = create_singlethread_workqueue(driver.name);
1242 if (zd_workqueue == NULL) {
1243 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1244 return -ENOMEM;
1245 }
1246
1247 r = usb_register(&driver);
1248 if (r) {
1249 destroy_workqueue(zd_workqueue);
1250 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1251 driver.name, r);
1252 return r;
1253 }
1254
1255 pr_debug("%s initialized\n", driver.name);
1256 return 0;
1257 }
1258
1259 static void __exit usb_exit(void)
1260 {
1261 pr_debug("%s usb_exit()\n", driver.name);
1262 usb_deregister(&driver);
1263 destroy_workqueue(zd_workqueue);
1264 }
1265
1266 module_init(usb_init);
1267 module_exit(usb_exit);
1268
1269 static int usb_int_regs_length(unsigned int count)
1270 {
1271 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1272 }
1273
1274 static void prepare_read_regs_int(struct zd_usb *usb)
1275 {
1276 struct zd_usb_interrupt *intr = &usb->intr;
1277
1278 spin_lock_irq(&intr->lock);
1279 intr->read_regs_enabled = 1;
1280 INIT_COMPLETION(intr->read_regs.completion);
1281 spin_unlock_irq(&intr->lock);
1282 }
1283
1284 static void disable_read_regs_int(struct zd_usb *usb)
1285 {
1286 struct zd_usb_interrupt *intr = &usb->intr;
1287
1288 spin_lock_irq(&intr->lock);
1289 intr->read_regs_enabled = 0;
1290 spin_unlock_irq(&intr->lock);
1291 }
1292
1293 static int get_results(struct zd_usb *usb, u16 *values,
1294 struct usb_req_read_regs *req, unsigned int count)
1295 {
1296 int r;
1297 int i;
1298 struct zd_usb_interrupt *intr = &usb->intr;
1299 struct read_regs_int *rr = &intr->read_regs;
1300 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1301
1302 spin_lock_irq(&intr->lock);
1303
1304 r = -EIO;
1305 /* The created block size seems to be larger than expected.
1306 * However results appear to be correct.
1307 */
1308 if (rr->length < usb_int_regs_length(count)) {
1309 dev_dbg_f(zd_usb_dev(usb),
1310 "error: actual length %d less than expected %d\n",
1311 rr->length, usb_int_regs_length(count));
1312 goto error_unlock;
1313 }
1314 if (rr->length > sizeof(rr->buffer)) {
1315 dev_dbg_f(zd_usb_dev(usb),
1316 "error: actual length %d exceeds buffer size %zu\n",
1317 rr->length, sizeof(rr->buffer));
1318 goto error_unlock;
1319 }
1320
1321 for (i = 0; i < count; i++) {
1322 struct reg_data *rd = &regs->regs[i];
1323 if (rd->addr != req->addr[i]) {
1324 dev_dbg_f(zd_usb_dev(usb),
1325 "rd[%d] addr %#06hx expected %#06hx\n", i,
1326 le16_to_cpu(rd->addr),
1327 le16_to_cpu(req->addr[i]));
1328 goto error_unlock;
1329 }
1330 values[i] = le16_to_cpu(rd->value);
1331 }
1332
1333 r = 0;
1334 error_unlock:
1335 spin_unlock_irq(&intr->lock);
1336 return r;
1337 }
1338
1339 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1340 const zd_addr_t *addresses, unsigned int count)
1341 {
1342 int r;
1343 int i, req_len, actual_req_len;
1344 struct usb_device *udev;
1345 struct usb_req_read_regs *req = NULL;
1346 unsigned long timeout;
1347
1348 if (count < 1) {
1349 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1350 return -EINVAL;
1351 }
1352 if (count > USB_MAX_IOREAD16_COUNT) {
1353 dev_dbg_f(zd_usb_dev(usb),
1354 "error: count %u exceeds possible max %u\n",
1355 count, USB_MAX_IOREAD16_COUNT);
1356 return -EINVAL;
1357 }
1358 if (in_atomic()) {
1359 dev_dbg_f(zd_usb_dev(usb),
1360 "error: io in atomic context not supported\n");
1361 return -EWOULDBLOCK;
1362 }
1363 if (!usb_int_enabled(usb)) {
1364 dev_dbg_f(zd_usb_dev(usb),
1365 "error: usb interrupt not enabled\n");
1366 return -EWOULDBLOCK;
1367 }
1368
1369 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1370 BUILD_BUG_ON(sizeof(struct usb_req_read_regs) + USB_MAX_IOREAD16_COUNT *
1371 sizeof(__le16) > sizeof(usb->req_buf));
1372 BUG_ON(sizeof(struct usb_req_read_regs) + count * sizeof(__le16) >
1373 sizeof(usb->req_buf));
1374
1375 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1376 req = (void *)usb->req_buf;
1377
1378 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1379 for (i = 0; i < count; i++)
1380 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1381
1382 udev = zd_usb_to_usbdev(usb);
1383 prepare_read_regs_int(usb);
1384 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1385 req, req_len, &actual_req_len, 1000 /* ms */);
1386 if (r) {
1387 dev_dbg_f(zd_usb_dev(usb),
1388 "error in usb_bulk_msg(). Error number %d\n", r);
1389 goto error;
1390 }
1391 if (req_len != actual_req_len) {
1392 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1393 " req_len %d != actual_req_len %d\n",
1394 req_len, actual_req_len);
1395 r = -EIO;
1396 goto error;
1397 }
1398
1399 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1400 msecs_to_jiffies(1000));
1401 if (!timeout) {
1402 disable_read_regs_int(usb);
1403 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1404 r = -ETIMEDOUT;
1405 goto error;
1406 }
1407
1408 r = get_results(usb, values, req, count);
1409 error:
1410 return r;
1411 }
1412
1413 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1414 unsigned int count)
1415 {
1416 int r;
1417 struct usb_device *udev;
1418 struct usb_req_write_regs *req = NULL;
1419 int i, req_len, actual_req_len;
1420
1421 if (count == 0)
1422 return 0;
1423 if (count > USB_MAX_IOWRITE16_COUNT) {
1424 dev_dbg_f(zd_usb_dev(usb),
1425 "error: count %u exceeds possible max %u\n",
1426 count, USB_MAX_IOWRITE16_COUNT);
1427 return -EINVAL;
1428 }
1429 if (in_atomic()) {
1430 dev_dbg_f(zd_usb_dev(usb),
1431 "error: io in atomic context not supported\n");
1432 return -EWOULDBLOCK;
1433 }
1434
1435 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1436 BUILD_BUG_ON(sizeof(struct usb_req_write_regs) +
1437 USB_MAX_IOWRITE16_COUNT * sizeof(struct reg_data) >
1438 sizeof(usb->req_buf));
1439 BUG_ON(sizeof(struct usb_req_write_regs) +
1440 count * sizeof(struct reg_data) >
1441 sizeof(usb->req_buf));
1442
1443 req_len = sizeof(struct usb_req_write_regs) +
1444 count * sizeof(struct reg_data);
1445 req = (void *)usb->req_buf;
1446
1447 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1448 for (i = 0; i < count; i++) {
1449 struct reg_data *rw = &req->reg_writes[i];
1450 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1451 rw->value = cpu_to_le16(ioreqs[i].value);
1452 }
1453
1454 udev = zd_usb_to_usbdev(usb);
1455 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1456 req, req_len, &actual_req_len, 1000 /* ms */);
1457 if (r) {
1458 dev_dbg_f(zd_usb_dev(usb),
1459 "error in usb_bulk_msg(). Error number %d\n", r);
1460 goto error;
1461 }
1462 if (req_len != actual_req_len) {
1463 dev_dbg_f(zd_usb_dev(usb),
1464 "error in usb_bulk_msg()"
1465 " req_len %d != actual_req_len %d\n",
1466 req_len, actual_req_len);
1467 r = -EIO;
1468 goto error;
1469 }
1470
1471 /* FALL-THROUGH with r == 0 */
1472 error:
1473 return r;
1474 }
1475
1476 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1477 {
1478 int r;
1479 struct usb_device *udev;
1480 struct usb_req_rfwrite *req = NULL;
1481 int i, req_len, actual_req_len;
1482 u16 bit_value_template;
1483
1484 if (in_atomic()) {
1485 dev_dbg_f(zd_usb_dev(usb),
1486 "error: io in atomic context not supported\n");
1487 return -EWOULDBLOCK;
1488 }
1489 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1490 dev_dbg_f(zd_usb_dev(usb),
1491 "error: bits %d are smaller than"
1492 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1493 bits, USB_MIN_RFWRITE_BIT_COUNT);
1494 return -EINVAL;
1495 }
1496 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1497 dev_dbg_f(zd_usb_dev(usb),
1498 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1499 bits, USB_MAX_RFWRITE_BIT_COUNT);
1500 return -EINVAL;
1501 }
1502 #ifdef DEBUG
1503 if (value & (~0UL << bits)) {
1504 dev_dbg_f(zd_usb_dev(usb),
1505 "error: value %#09x has bits >= %d set\n",
1506 value, bits);
1507 return -EINVAL;
1508 }
1509 #endif /* DEBUG */
1510
1511 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1512
1513 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1514 if (r) {
1515 dev_dbg_f(zd_usb_dev(usb),
1516 "error %d: Couldn't read CR203\n", r);
1517 return r;
1518 }
1519 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1520
1521 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1522 BUILD_BUG_ON(sizeof(struct usb_req_rfwrite) +
1523 USB_MAX_RFWRITE_BIT_COUNT * sizeof(__le16) >
1524 sizeof(usb->req_buf));
1525 BUG_ON(sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16) >
1526 sizeof(usb->req_buf));
1527
1528 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1529 req = (void *)usb->req_buf;
1530
1531 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1532 /* 1: 3683a, but not used in ZYDAS driver */
1533 req->value = cpu_to_le16(2);
1534 req->bits = cpu_to_le16(bits);
1535
1536 for (i = 0; i < bits; i++) {
1537 u16 bv = bit_value_template;
1538 if (value & (1 << (bits-1-i)))
1539 bv |= RF_DATA;
1540 req->bit_values[i] = cpu_to_le16(bv);
1541 }
1542
1543 udev = zd_usb_to_usbdev(usb);
1544 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1545 req, req_len, &actual_req_len, 1000 /* ms */);
1546 if (r) {
1547 dev_dbg_f(zd_usb_dev(usb),
1548 "error in usb_bulk_msg(). Error number %d\n", r);
1549 goto out;
1550 }
1551 if (req_len != actual_req_len) {
1552 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1553 " req_len %d != actual_req_len %d\n",
1554 req_len, actual_req_len);
1555 r = -EIO;
1556 goto out;
1557 }
1558
1559 /* FALL-THROUGH with r == 0 */
1560 out:
1561 return r;
1562 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree