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[PATCH] zd1211rw: Firmware version vs bootcode version mismatch handling
[linux-2.6/linux-2.6-openrd.git] / drivers / net / wireless / zd1211rw / zd_usb.c
blob06f72cbaf0ad8b7b3a77690532f3d57c8aac39d0
1 /* zd_usb.c
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 */
17
18 #include <asm/unaligned.h>
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <linux/firmware.h>
23 #include <linux/device.h>
24 #include <linux/errno.h>
25 #include <linux/skbuff.h>
26 #include <linux/usb.h>
27 #include <net/ieee80211.h>
28
29 #include "zd_def.h"
30 #include "zd_netdev.h"
31 #include "zd_mac.h"
32 #include "zd_usb.h"
33 #include "zd_util.h"
34
35 static struct usb_device_id usb_ids[] = {
36 /* ZD1211 */
37 { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
38 { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
39 { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
40 { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
41 { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
42 { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
43 { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
44 { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
45 { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
46 /* ZD1211B */
47 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
48 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
49 { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
50 {}
51 };
52
53 MODULE_LICENSE("GPL");
54 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
55 MODULE_AUTHOR("Ulrich Kunitz");
56 MODULE_AUTHOR("Daniel Drake");
57 MODULE_VERSION("1.0");
58 MODULE_DEVICE_TABLE(usb, usb_ids);
59
60 #define FW_ZD1211_PREFIX "zd1211/zd1211_"
61 #define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
62
63 /* register address handling */
64
65 #ifdef DEBUG
66 static int check_addr(struct zd_usb *usb, zd_addr_t addr)
67 {
68 u32 base = ZD_ADDR_BASE(addr);
69 u32 offset = ZD_OFFSET(addr);
70
71 if ((u32)addr & ADDR_ZERO_MASK)
72 goto invalid_address;
73 switch (base) {
74 case USB_BASE:
75 break;
76 case CR_BASE:
77 if (offset > CR_MAX_OFFSET) {
78 dev_dbg(zd_usb_dev(usb),
79 "CR offset %#010x larger than"
80 " CR_MAX_OFFSET %#10x\n",
81 offset, CR_MAX_OFFSET);
82 goto invalid_address;
83 }
84 if (offset & 1) {
85 dev_dbg(zd_usb_dev(usb),
86 "CR offset %#010x is not a multiple of 2\n",
87 offset);
88 goto invalid_address;
89 }
90 break;
91 case E2P_BASE:
92 if (offset > E2P_MAX_OFFSET) {
93 dev_dbg(zd_usb_dev(usb),
94 "E2P offset %#010x larger than"
95 " E2P_MAX_OFFSET %#010x\n",
96 offset, E2P_MAX_OFFSET);
97 goto invalid_address;
98 }
99 break;
100 case FW_BASE:
101 if (!usb->fw_base_offset) {
102 dev_dbg(zd_usb_dev(usb),
103 "ERROR: fw base offset has not been set\n");
104 return -EAGAIN;
105 }
106 if (offset > FW_MAX_OFFSET) {
107 dev_dbg(zd_usb_dev(usb),
108 "FW offset %#10x is larger than"
109 " FW_MAX_OFFSET %#010x\n",
110 offset, FW_MAX_OFFSET);
111 goto invalid_address;
112 }
113 break;
114 default:
115 dev_dbg(zd_usb_dev(usb),
116 "address has unsupported base %#010x\n", addr);
117 goto invalid_address;
118 }
119
120 return 0;
121 invalid_address:
122 dev_dbg(zd_usb_dev(usb),
123 "ERROR: invalid address: %#010x\n", addr);
124 return -EINVAL;
125 }
126 #endif /* DEBUG */
127
128 static u16 usb_addr(struct zd_usb *usb, zd_addr_t addr)
129 {
130 u32 base;
131 u16 offset;
132
133 base = ZD_ADDR_BASE(addr);
134 offset = ZD_OFFSET(addr);
135
136 ZD_ASSERT(check_addr(usb, addr) == 0);
137
138 switch (base) {
139 case CR_BASE:
140 offset += CR_BASE_OFFSET;
141 break;
142 case E2P_BASE:
143 offset += E2P_BASE_OFFSET;
144 break;
145 case FW_BASE:
146 offset += usb->fw_base_offset;
147 break;
148 }
149
150 return offset;
151 }
152
153 /* USB device initialization */
154
155 static int request_fw_file(
156 const struct firmware **fw, const char *name, struct device *device)
157 {
158 int r;
159
160 dev_dbg_f(device, "fw name %s\n", name);
161
162 r = request_firmware(fw, name, device);
163 if (r)
164 dev_err(device,
165 "Could not load firmware file %s. Error number %d\n",
166 name, r);
167 return r;
168 }
169
170 static inline u16 get_bcdDevice(const struct usb_device *udev)
171 {
172 return le16_to_cpu(udev->descriptor.bcdDevice);
173 }
174
175 enum upload_code_flags {
176 REBOOT = 1,
177 };
178
179 /* Ensures that MAX_TRANSFER_SIZE is even. */
180 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
181
182 static int upload_code(struct usb_device *udev,
183 const u8 *data, size_t size, u16 code_offset, int flags)
184 {
185 u8 *p;
186 int r;
187
188 /* USB request blocks need "kmalloced" buffers.
189 */
190 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
191 if (!p) {
192 dev_err(&udev->dev, "out of memory\n");
193 r = -ENOMEM;
194 goto error;
195 }
196
197 size &= ~1;
198 while (size > 0) {
199 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
200 size : MAX_TRANSFER_SIZE;
201
202 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
203
204 memcpy(p, data, transfer_size);
205 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
206 USB_REQ_FIRMWARE_DOWNLOAD,
207 USB_DIR_OUT | USB_TYPE_VENDOR,
208 code_offset, 0, p, transfer_size, 1000 /* ms */);
209 if (r < 0) {
210 dev_err(&udev->dev,
211 "USB control request for firmware upload"
212 " failed. Error number %d\n", r);
213 goto error;
214 }
215 transfer_size = r & ~1;
216
217 size -= transfer_size;
218 data += transfer_size;
219 code_offset += transfer_size/sizeof(u16);
220 }
221
222 if (flags & REBOOT) {
223 u8 ret;
224
225 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
226 USB_REQ_FIRMWARE_CONFIRM,
227 USB_DIR_IN | USB_TYPE_VENDOR,
228 0, 0, &ret, sizeof(ret), 5000 /* ms */);
229 if (r != sizeof(ret)) {
230 dev_err(&udev->dev,
231 "control request firmeware confirmation failed."
232 " Return value %d\n", r);
233 if (r >= 0)
234 r = -ENODEV;
235 goto error;
236 }
237 if (ret & 0x80) {
238 dev_err(&udev->dev,
239 "Internal error while downloading."
240 " Firmware confirm return value %#04x\n",
241 (unsigned int)ret);
242 r = -ENODEV;
243 goto error;
244 }
245 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
246 (unsigned int)ret);
247 }
248
249 r = 0;
250 error:
251 kfree(p);
252 return r;
253 }
254
255 static u16 get_word(const void *data, u16 offset)
256 {
257 const __le16 *p = data;
258 return le16_to_cpu(p[offset]);
259 }
260
261 static char *get_fw_name(char *buffer, size_t size, u8 device_type,
262 const char* postfix)
263 {
264 scnprintf(buffer, size, "%s%s",
265 device_type == DEVICE_ZD1211B ?
266 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
267 postfix);
268 return buffer;
269 }
270
271 static int handle_version_mismatch(struct usb_device *udev, u8 device_type,
272 const struct firmware *ub_fw)
273 {
274 const struct firmware *ur_fw = NULL;
275 int offset;
276 int r = 0;
277 char fw_name[128];
278
279 r = request_fw_file(&ur_fw,
280 get_fw_name(fw_name, sizeof(fw_name), device_type, "ur"),
281 &udev->dev);
282 if (r)
283 goto error;
284
285 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START_OFFSET,
286 REBOOT);
287 if (r)
288 goto error;
289
290 offset = ((EEPROM_REGS_OFFSET + EEPROM_REGS_SIZE) * sizeof(u16));
291 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
292 E2P_BASE_OFFSET + EEPROM_REGS_SIZE, REBOOT);
293
294 /* At this point, the vendor driver downloads the whole firmware
295 * image, hacks around with version IDs, and uploads it again,
296 * completely overwriting the boot code. We do not do this here as
297 * it is not required on any tested devices, and it is suspected to
298 * cause problems. */
299 error:
300 release_firmware(ur_fw);
301 return r;
302 }
303
304 static int upload_firmware(struct usb_device *udev, u8 device_type)
305 {
306 int r;
307 u16 fw_bcdDevice;
308 u16 bcdDevice;
309 const struct firmware *ub_fw = NULL;
310 const struct firmware *uph_fw = NULL;
311 char fw_name[128];
312
313 bcdDevice = get_bcdDevice(udev);
314
315 r = request_fw_file(&ub_fw,
316 get_fw_name(fw_name, sizeof(fw_name), device_type, "ub"),
317 &udev->dev);
318 if (r)
319 goto error;
320
321 fw_bcdDevice = get_word(ub_fw->data, EEPROM_REGS_OFFSET);
322
323 if (fw_bcdDevice != bcdDevice) {
324 dev_info(&udev->dev,
325 "firmware version %#06x and device bootcode version "
326 "%#06x differ\n", fw_bcdDevice, bcdDevice);
327 if (bcdDevice <= 0x4313)
328 dev_warn(&udev->dev, "device has old bootcode, please "
329 "report success or failure\n");
330
331 r = handle_version_mismatch(udev, device_type, ub_fw);
332 if (r)
333 goto error;
334 } else {
335 dev_dbg_f(&udev->dev,
336 "firmware device id %#06x is equal to the "
337 "actual device id\n", fw_bcdDevice);
338 }
339
340
341 r = request_fw_file(&uph_fw,
342 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
343 &udev->dev);
344 if (r)
345 goto error;
346
347 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START_OFFSET,
348 REBOOT);
349 if (r) {
350 dev_err(&udev->dev,
351 "Could not upload firmware code uph. Error number %d\n",
352 r);
353 }
354
355 /* FALL-THROUGH */
356 error:
357 release_firmware(ub_fw);
358 release_firmware(uph_fw);
359 return r;
360 }
361
362 static void disable_read_regs_int(struct zd_usb *usb)
363 {
364 struct zd_usb_interrupt *intr = &usb->intr;
365
366 spin_lock(&intr->lock);
367 intr->read_regs_enabled = 0;
368 spin_unlock(&intr->lock);
369 }
370
371 #define urb_dev(urb) (&(urb)->dev->dev)
372
373 static inline void handle_regs_int(struct urb *urb)
374 {
375 struct zd_usb *usb = urb->context;
376 struct zd_usb_interrupt *intr = &usb->intr;
377 int len;
378
379 ZD_ASSERT(in_interrupt());
380 spin_lock(&intr->lock);
381
382 if (intr->read_regs_enabled) {
383 intr->read_regs.length = len = urb->actual_length;
384
385 if (len > sizeof(intr->read_regs.buffer))
386 len = sizeof(intr->read_regs.buffer);
387 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
388 intr->read_regs_enabled = 0;
389 complete(&intr->read_regs.completion);
390 goto out;
391 }
392
393 dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
394 out:
395 spin_unlock(&intr->lock);
396 }
397
398 static inline void handle_retry_failed_int(struct urb *urb)
399 {
400 dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
401 }
402
403
404 static void int_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
405 {
406 int r;
407 struct usb_int_header *hdr;
408
409 switch (urb->status) {
410 case 0:
411 break;
412 case -ESHUTDOWN:
413 case -EINVAL:
414 case -ENODEV:
415 case -ENOENT:
416 case -ECONNRESET:
417 case -EPIPE:
418 goto kfree;
419 default:
420 goto resubmit;
421 }
422
423 if (urb->actual_length < sizeof(hdr)) {
424 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
425 goto resubmit;
426 }
427
428 hdr = urb->transfer_buffer;
429 if (hdr->type != USB_INT_TYPE) {
430 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
431 goto resubmit;
432 }
433
434 switch (hdr->id) {
435 case USB_INT_ID_REGS:
436 handle_regs_int(urb);
437 break;
438 case USB_INT_ID_RETRY_FAILED:
439 handle_retry_failed_int(urb);
440 break;
441 default:
442 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
443 (unsigned int)hdr->id);
444 goto resubmit;
445 }
446
447 resubmit:
448 r = usb_submit_urb(urb, GFP_ATOMIC);
449 if (r) {
450 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
451 goto kfree;
452 }
453 return;
454 kfree:
455 kfree(urb->transfer_buffer);
456 }
457
458 static inline int int_urb_interval(struct usb_device *udev)
459 {
460 switch (udev->speed) {
461 case USB_SPEED_HIGH:
462 return 4;
463 case USB_SPEED_LOW:
464 return 10;
465 case USB_SPEED_FULL:
466 default:
467 return 1;
468 }
469 }
470
471 static inline int usb_int_enabled(struct zd_usb *usb)
472 {
473 unsigned long flags;
474 struct zd_usb_interrupt *intr = &usb->intr;
475 struct urb *urb;
476
477 spin_lock_irqsave(&intr->lock, flags);
478 urb = intr->urb;
479 spin_unlock_irqrestore(&intr->lock, flags);
480 return urb != NULL;
481 }
482
483 int zd_usb_enable_int(struct zd_usb *usb)
484 {
485 int r;
486 struct usb_device *udev;
487 struct zd_usb_interrupt *intr = &usb->intr;
488 void *transfer_buffer = NULL;
489 struct urb *urb;
490
491 dev_dbg_f(zd_usb_dev(usb), "\n");
492
493 urb = usb_alloc_urb(0, GFP_NOFS);
494 if (!urb) {
495 r = -ENOMEM;
496 goto out;
497 }
498
499 ZD_ASSERT(!irqs_disabled());
500 spin_lock_irq(&intr->lock);
501 if (intr->urb) {
502 spin_unlock_irq(&intr->lock);
503 r = 0;
504 goto error_free_urb;
505 }
506 intr->urb = urb;
507 spin_unlock_irq(&intr->lock);
508
509 /* TODO: make it a DMA buffer */
510 r = -ENOMEM;
511 transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_NOFS);
512 if (!transfer_buffer) {
513 dev_dbg_f(zd_usb_dev(usb),
514 "couldn't allocate transfer_buffer\n");
515 goto error_set_urb_null;
516 }
517
518 udev = zd_usb_to_usbdev(usb);
519 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
520 transfer_buffer, USB_MAX_EP_INT_BUFFER,
521 int_urb_complete, usb,
522 intr->interval);
523
524 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
525 r = usb_submit_urb(urb, GFP_NOFS);
526 if (r) {
527 dev_dbg_f(zd_usb_dev(usb),
528 "Couldn't submit urb. Error number %d\n", r);
529 goto error;
530 }
531
532 return 0;
533 error:
534 kfree(transfer_buffer);
535 error_set_urb_null:
536 spin_lock_irq(&intr->lock);
537 intr->urb = NULL;
538 spin_unlock_irq(&intr->lock);
539 error_free_urb:
540 usb_free_urb(urb);
541 out:
542 return r;
543 }
544
545 void zd_usb_disable_int(struct zd_usb *usb)
546 {
547 unsigned long flags;
548 struct zd_usb_interrupt *intr = &usb->intr;
549 struct urb *urb;
550
551 spin_lock_irqsave(&intr->lock, flags);
552 urb = intr->urb;
553 if (!urb) {
554 spin_unlock_irqrestore(&intr->lock, flags);
555 return;
556 }
557 intr->urb = NULL;
558 spin_unlock_irqrestore(&intr->lock, flags);
559
560 usb_kill_urb(urb);
561 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
562 usb_free_urb(urb);
563 }
564
565 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
566 unsigned int length)
567 {
568 int i;
569 struct zd_mac *mac = zd_usb_to_mac(usb);
570 const struct rx_length_info *length_info;
571
572 if (length < sizeof(struct rx_length_info)) {
573 /* It's not a complete packet anyhow. */
574 return;
575 }
576 length_info = (struct rx_length_info *)
577 (buffer + length - sizeof(struct rx_length_info));
578
579 /* It might be that three frames are merged into a single URB
580 * transaction. We have to check for the length info tag.
581 *
582 * While testing we discovered that length_info might be unaligned,
583 * because if USB transactions are merged, the last packet will not
584 * be padded. Unaligned access might also happen if the length_info
585 * structure is not present.
586 */
587 if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
588 {
589 unsigned int l, k, n;
590 for (i = 0, l = 0;; i++) {
591 k = le16_to_cpu(get_unaligned(&length_info->length[i]));
592 n = l+k;
593 if (n > length)
594 return;
595 zd_mac_rx(mac, buffer+l, k);
596 if (i >= 2)
597 return;
598 l = (n+3) & ~3;
599 }
600 } else {
601 zd_mac_rx(mac, buffer, length);
602 }
603 }
604
605 static void rx_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
606 {
607 struct zd_usb *usb;
608 struct zd_usb_rx *rx;
609 const u8 *buffer;
610 unsigned int length;
611
612 switch (urb->status) {
613 case 0:
614 break;
615 case -ESHUTDOWN:
616 case -EINVAL:
617 case -ENODEV:
618 case -ENOENT:
619 case -ECONNRESET:
620 case -EPIPE:
621 return;
622 default:
623 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
624 goto resubmit;
625 }
626
627 buffer = urb->transfer_buffer;
628 length = urb->actual_length;
629 usb = urb->context;
630 rx = &usb->rx;
631
632 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
633 /* If there is an old first fragment, we don't care. */
634 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
635 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
636 spin_lock(&rx->lock);
637 memcpy(rx->fragment, buffer, length);
638 rx->fragment_length = length;
639 spin_unlock(&rx->lock);
640 goto resubmit;
641 }
642
643 spin_lock(&rx->lock);
644 if (rx->fragment_length > 0) {
645 /* We are on a second fragment, we believe */
646 ZD_ASSERT(length + rx->fragment_length <=
647 ARRAY_SIZE(rx->fragment));
648 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
649 memcpy(rx->fragment+rx->fragment_length, buffer, length);
650 handle_rx_packet(usb, rx->fragment,
651 rx->fragment_length + length);
652 rx->fragment_length = 0;
653 spin_unlock(&rx->lock);
654 } else {
655 spin_unlock(&rx->lock);
656 handle_rx_packet(usb, buffer, length);
657 }
658
659 resubmit:
660 usb_submit_urb(urb, GFP_ATOMIC);
661 }
662
663 struct urb *alloc_urb(struct zd_usb *usb)
664 {
665 struct usb_device *udev = zd_usb_to_usbdev(usb);
666 struct urb *urb;
667 void *buffer;
668
669 urb = usb_alloc_urb(0, GFP_NOFS);
670 if (!urb)
671 return NULL;
672 buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS,
673 &urb->transfer_dma);
674 if (!buffer) {
675 usb_free_urb(urb);
676 return NULL;
677 }
678
679 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
680 buffer, USB_MAX_RX_SIZE,
681 rx_urb_complete, usb);
682 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
683
684 return urb;
685 }
686
687 void free_urb(struct urb *urb)
688 {
689 if (!urb)
690 return;
691 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
692 urb->transfer_buffer, urb->transfer_dma);
693 usb_free_urb(urb);
694 }
695
696 int zd_usb_enable_rx(struct zd_usb *usb)
697 {
698 int i, r;
699 struct zd_usb_rx *rx = &usb->rx;
700 struct urb **urbs;
701
702 dev_dbg_f(zd_usb_dev(usb), "\n");
703
704 r = -ENOMEM;
705 urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS);
706 if (!urbs)
707 goto error;
708 for (i = 0; i < URBS_COUNT; i++) {
709 urbs[i] = alloc_urb(usb);
710 if (!urbs[i])
711 goto error;
712 }
713
714 ZD_ASSERT(!irqs_disabled());
715 spin_lock_irq(&rx->lock);
716 if (rx->urbs) {
717 spin_unlock_irq(&rx->lock);
718 r = 0;
719 goto error;
720 }
721 rx->urbs = urbs;
722 rx->urbs_count = URBS_COUNT;
723 spin_unlock_irq(&rx->lock);
724
725 for (i = 0; i < URBS_COUNT; i++) {
726 r = usb_submit_urb(urbs[i], GFP_NOFS);
727 if (r)
728 goto error_submit;
729 }
730
731 return 0;
732 error_submit:
733 for (i = 0; i < URBS_COUNT; i++) {
734 usb_kill_urb(urbs[i]);
735 }
736 spin_lock_irq(&rx->lock);
737 rx->urbs = NULL;
738 rx->urbs_count = 0;
739 spin_unlock_irq(&rx->lock);
740 error:
741 if (urbs) {
742 for (i = 0; i < URBS_COUNT; i++)
743 free_urb(urbs[i]);
744 }
745 return r;
746 }
747
748 void zd_usb_disable_rx(struct zd_usb *usb)
749 {
750 int i;
751 unsigned long flags;
752 struct urb **urbs;
753 unsigned int count;
754 struct zd_usb_rx *rx = &usb->rx;
755
756 spin_lock_irqsave(&rx->lock, flags);
757 urbs = rx->urbs;
758 count = rx->urbs_count;
759 spin_unlock_irqrestore(&rx->lock, flags);
760 if (!urbs)
761 return;
762
763 for (i = 0; i < count; i++) {
764 usb_kill_urb(urbs[i]);
765 free_urb(urbs[i]);
766 }
767 kfree(urbs);
768
769 spin_lock_irqsave(&rx->lock, flags);
770 rx->urbs = NULL;
771 rx->urbs_count = 0;
772 spin_unlock_irqrestore(&rx->lock, flags);
773 }
774
775 static void tx_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
776 {
777 int r;
778
779 switch (urb->status) {
780 case 0:
781 break;
782 case -ESHUTDOWN:
783 case -EINVAL:
784 case -ENODEV:
785 case -ENOENT:
786 case -ECONNRESET:
787 case -EPIPE:
788 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
789 break;
790 default:
791 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
792 goto resubmit;
793 }
794 free_urb:
795 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
796 urb->transfer_buffer, urb->transfer_dma);
797 usb_free_urb(urb);
798 return;
799 resubmit:
800 r = usb_submit_urb(urb, GFP_ATOMIC);
801 if (r) {
802 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
803 goto free_urb;
804 }
805 }
806
807 /* Puts the frame on the USB endpoint. It doesn't wait for
808 * completion. The frame must contain the control set.
809 */
810 int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
811 {
812 int r;
813 struct usb_device *udev = zd_usb_to_usbdev(usb);
814 struct urb *urb;
815 void *buffer;
816
817 urb = usb_alloc_urb(0, GFP_ATOMIC);
818 if (!urb) {
819 r = -ENOMEM;
820 goto out;
821 }
822
823 buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
824 &urb->transfer_dma);
825 if (!buffer) {
826 r = -ENOMEM;
827 goto error_free_urb;
828 }
829 memcpy(buffer, frame, length);
830
831 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
832 buffer, length, tx_urb_complete, NULL);
833 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
834
835 r = usb_submit_urb(urb, GFP_ATOMIC);
836 if (r)
837 goto error;
838 return 0;
839 error:
840 usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
841 urb->transfer_dma);
842 error_free_urb:
843 usb_free_urb(urb);
844 out:
845 return r;
846 }
847
848 static inline void init_usb_interrupt(struct zd_usb *usb)
849 {
850 struct zd_usb_interrupt *intr = &usb->intr;
851
852 spin_lock_init(&intr->lock);
853 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
854 init_completion(&intr->read_regs.completion);
855 intr->read_regs.cr_int_addr = cpu_to_le16(usb_addr(usb, CR_INTERRUPT));
856 }
857
858 static inline void init_usb_rx(struct zd_usb *usb)
859 {
860 struct zd_usb_rx *rx = &usb->rx;
861 spin_lock_init(&rx->lock);
862 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
863 rx->usb_packet_size = 512;
864 } else {
865 rx->usb_packet_size = 64;
866 }
867 ZD_ASSERT(rx->fragment_length == 0);
868 }
869
870 static inline void init_usb_tx(struct zd_usb *usb)
871 {
872 /* FIXME: at this point we will allocate a fixed number of urb's for
873 * use in a cyclic scheme */
874 }
875
876 void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
877 struct usb_interface *intf)
878 {
879 memset(usb, 0, sizeof(*usb));
880 usb->intf = usb_get_intf(intf);
881 usb_set_intfdata(usb->intf, netdev);
882 init_usb_interrupt(usb);
883 init_usb_tx(usb);
884 init_usb_rx(usb);
885 }
886
887 int zd_usb_init_hw(struct zd_usb *usb)
888 {
889 int r;
890 struct zd_chip *chip = zd_usb_to_chip(usb);
891
892 ZD_ASSERT(mutex_is_locked(&chip->mutex));
893 r = zd_ioread16_locked(chip, &usb->fw_base_offset,
894 USB_REG((u16)FW_BASE_ADDR_OFFSET));
895 if (r)
896 return r;
897 dev_dbg_f(zd_usb_dev(usb), "fw_base_offset: %#06hx\n",
898 usb->fw_base_offset);
899
900 return 0;
901 }
902
903 void zd_usb_clear(struct zd_usb *usb)
904 {
905 usb_set_intfdata(usb->intf, NULL);
906 usb_put_intf(usb->intf);
907 memset(usb, 0, sizeof(*usb));
908 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
909 }
910
911 static const char *speed(enum usb_device_speed speed)
912 {
913 switch (speed) {
914 case USB_SPEED_LOW:
915 return "low";
916 case USB_SPEED_FULL:
917 return "full";
918 case USB_SPEED_HIGH:
919 return "high";
920 default:
921 return "unknown speed";
922 }
923 }
924
925 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
926 {
927 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
928 le16_to_cpu(udev->descriptor.idVendor),
929 le16_to_cpu(udev->descriptor.idProduct),
930 get_bcdDevice(udev),
931 speed(udev->speed));
932 }
933
934 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
935 {
936 struct usb_device *udev = interface_to_usbdev(usb->intf);
937 return scnprint_id(udev, buffer, size);
938 }
939
940 #ifdef DEBUG
941 static void print_id(struct usb_device *udev)
942 {
943 char buffer[40];
944
945 scnprint_id(udev, buffer, sizeof(buffer));
946 buffer[sizeof(buffer)-1] = 0;
947 dev_dbg_f(&udev->dev, "%s\n", buffer);
948 }
949 #else
950 #define print_id(udev) do { } while (0)
951 #endif
952
953 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
954 {
955 int r;
956 struct usb_device *udev = interface_to_usbdev(intf);
957 struct net_device *netdev = NULL;
958
959 print_id(udev);
960
961 switch (udev->speed) {
962 case USB_SPEED_LOW:
963 case USB_SPEED_FULL:
964 case USB_SPEED_HIGH:
965 break;
966 default:
967 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
968 r = -ENODEV;
969 goto error;
970 }
971
972 netdev = zd_netdev_alloc(intf);
973 if (netdev == NULL) {
974 r = -ENOMEM;
975 goto error;
976 }
977
978 r = upload_firmware(udev, id->driver_info);
979 if (r) {
980 dev_err(&intf->dev,
981 "couldn't load firmware. Error number %d\n", r);
982 goto error;
983 }
984
985 r = usb_reset_configuration(udev);
986 if (r) {
987 dev_dbg_f(&intf->dev,
988 "couldn't reset configuration. Error number %d\n", r);
989 goto error;
990 }
991
992 /* At this point the interrupt endpoint is not generally enabled. We
993 * save the USB bandwidth until the network device is opened. But
994 * notify that the initialization of the MAC will require the
995 * interrupts to be temporary enabled.
996 */
997 r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
998 if (r) {
999 dev_dbg_f(&intf->dev,
1000 "couldn't initialize mac. Error number %d\n", r);
1001 goto error;
1002 }
1003
1004 r = register_netdev(netdev);
1005 if (r) {
1006 dev_dbg_f(&intf->dev,
1007 "couldn't register netdev. Error number %d\n", r);
1008 goto error;
1009 }
1010
1011 dev_dbg_f(&intf->dev, "successful\n");
1012 dev_info(&intf->dev,"%s\n", netdev->name);
1013 return 0;
1014 error:
1015 usb_reset_device(interface_to_usbdev(intf));
1016 zd_netdev_free(netdev);
1017 return r;
1018 }
1019
1020 static void disconnect(struct usb_interface *intf)
1021 {
1022 struct net_device *netdev = zd_intf_to_netdev(intf);
1023 struct zd_mac *mac = zd_netdev_mac(netdev);
1024 struct zd_usb *usb = &mac->chip.usb;
1025
1026 dev_dbg_f(zd_usb_dev(usb), "\n");
1027
1028 zd_netdev_disconnect(netdev);
1029
1030 /* Just in case something has gone wrong! */
1031 zd_usb_disable_rx(usb);
1032 zd_usb_disable_int(usb);
1033
1034 /* If the disconnect has been caused by a removal of the
1035 * driver module, the reset allows reloading of the driver. If the
1036 * reset will not be executed here, the upload of the firmware in the
1037 * probe function caused by the reloading of the driver will fail.
1038 */
1039 usb_reset_device(interface_to_usbdev(intf));
1040
1041 /* If somebody still waits on this lock now, this is an error. */
1042 zd_netdev_free(netdev);
1043 dev_dbg(&intf->dev, "disconnected\n");
1044 }
1045
1046 static struct usb_driver driver = {
1047 .name = "zd1211rw",
1048 .id_table = usb_ids,
1049 .probe = probe,
1050 .disconnect = disconnect,
1051 };
1052
1053 static int __init usb_init(void)
1054 {
1055 int r;
1056
1057 pr_debug("usb_init()\n");
1058
1059 r = usb_register(&driver);
1060 if (r) {
1061 printk(KERN_ERR "usb_register() failed. Error number %d\n", r);
1062 return r;
1063 }
1064
1065 pr_debug("zd1211rw initialized\n");
1066 return 0;
1067 }
1068
1069 static void __exit usb_exit(void)
1070 {
1071 pr_debug("usb_exit()\n");
1072 usb_deregister(&driver);
1073 }
1074
1075 module_init(usb_init);
1076 module_exit(usb_exit);
1077
1078 static int usb_int_regs_length(unsigned int count)
1079 {
1080 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1081 }
1082
1083 static void prepare_read_regs_int(struct zd_usb *usb)
1084 {
1085 struct zd_usb_interrupt *intr = &usb->intr;
1086
1087 spin_lock(&intr->lock);
1088 intr->read_regs_enabled = 1;
1089 INIT_COMPLETION(intr->read_regs.completion);
1090 spin_unlock(&intr->lock);
1091 }
1092
1093 static int get_results(struct zd_usb *usb, u16 *values,
1094 struct usb_req_read_regs *req, unsigned int count)
1095 {
1096 int r;
1097 int i;
1098 struct zd_usb_interrupt *intr = &usb->intr;
1099 struct read_regs_int *rr = &intr->read_regs;
1100 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1101
1102 spin_lock(&intr->lock);
1103
1104 r = -EIO;
1105 /* The created block size seems to be larger than expected.
1106 * However results appear to be correct.
1107 */
1108 if (rr->length < usb_int_regs_length(count)) {
1109 dev_dbg_f(zd_usb_dev(usb),
1110 "error: actual length %d less than expected %d\n",
1111 rr->length, usb_int_regs_length(count));
1112 goto error_unlock;
1113 }
1114 if (rr->length > sizeof(rr->buffer)) {
1115 dev_dbg_f(zd_usb_dev(usb),
1116 "error: actual length %d exceeds buffer size %zu\n",
1117 rr->length, sizeof(rr->buffer));
1118 goto error_unlock;
1119 }
1120
1121 for (i = 0; i < count; i++) {
1122 struct reg_data *rd = &regs->regs[i];
1123 if (rd->addr != req->addr[i]) {
1124 dev_dbg_f(zd_usb_dev(usb),
1125 "rd[%d] addr %#06hx expected %#06hx\n", i,
1126 le16_to_cpu(rd->addr),
1127 le16_to_cpu(req->addr[i]));
1128 goto error_unlock;
1129 }
1130 values[i] = le16_to_cpu(rd->value);
1131 }
1132
1133 r = 0;
1134 error_unlock:
1135 spin_unlock(&intr->lock);
1136 return r;
1137 }
1138
1139 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1140 const zd_addr_t *addresses, unsigned int count)
1141 {
1142 int r;
1143 int i, req_len, actual_req_len;
1144 struct usb_device *udev;
1145 struct usb_req_read_regs *req = NULL;
1146 unsigned long timeout;
1147
1148 if (count < 1) {
1149 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1150 return -EINVAL;
1151 }
1152 if (count > USB_MAX_IOREAD16_COUNT) {
1153 dev_dbg_f(zd_usb_dev(usb),
1154 "error: count %u exceeds possible max %u\n",
1155 count, USB_MAX_IOREAD16_COUNT);
1156 return -EINVAL;
1157 }
1158 if (in_atomic()) {
1159 dev_dbg_f(zd_usb_dev(usb),
1160 "error: io in atomic context not supported\n");
1161 return -EWOULDBLOCK;
1162 }
1163 if (!usb_int_enabled(usb)) {
1164 dev_dbg_f(zd_usb_dev(usb),
1165 "error: usb interrupt not enabled\n");
1166 return -EWOULDBLOCK;
1167 }
1168
1169 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1170 req = kmalloc(req_len, GFP_NOFS);
1171 if (!req)
1172 return -ENOMEM;
1173 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1174 for (i = 0; i < count; i++)
1175 req->addr[i] = cpu_to_le16(usb_addr(usb, addresses[i]));
1176
1177 udev = zd_usb_to_usbdev(usb);
1178 prepare_read_regs_int(usb);
1179 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1180 req, req_len, &actual_req_len, 1000 /* ms */);
1181 if (r) {
1182 dev_dbg_f(zd_usb_dev(usb),
1183 "error in usb_bulk_msg(). Error number %d\n", r);
1184 goto error;
1185 }
1186 if (req_len != actual_req_len) {
1187 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1188 " req_len %d != actual_req_len %d\n",
1189 req_len, actual_req_len);
1190 r = -EIO;
1191 goto error;
1192 }
1193
1194 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1195 msecs_to_jiffies(1000));
1196 if (!timeout) {
1197 disable_read_regs_int(usb);
1198 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1199 r = -ETIMEDOUT;
1200 goto error;
1201 }
1202
1203 r = get_results(usb, values, req, count);
1204 error:
1205 kfree(req);
1206 return r;
1207 }
1208
1209 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1210 unsigned int count)
1211 {
1212 int r;
1213 struct usb_device *udev;
1214 struct usb_req_write_regs *req = NULL;
1215 int i, req_len, actual_req_len;
1216
1217 if (count == 0)
1218 return 0;
1219 if (count > USB_MAX_IOWRITE16_COUNT) {
1220 dev_dbg_f(zd_usb_dev(usb),
1221 "error: count %u exceeds possible max %u\n",
1222 count, USB_MAX_IOWRITE16_COUNT);
1223 return -EINVAL;
1224 }
1225 if (in_atomic()) {
1226 dev_dbg_f(zd_usb_dev(usb),
1227 "error: io in atomic context not supported\n");
1228 return -EWOULDBLOCK;
1229 }
1230
1231 req_len = sizeof(struct usb_req_write_regs) +
1232 count * sizeof(struct reg_data);
1233 req = kmalloc(req_len, GFP_NOFS);
1234 if (!req)
1235 return -ENOMEM;
1236
1237 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1238 for (i = 0; i < count; i++) {
1239 struct reg_data *rw = &req->reg_writes[i];
1240 rw->addr = cpu_to_le16(usb_addr(usb, ioreqs[i].addr));
1241 rw->value = cpu_to_le16(ioreqs[i].value);
1242 }
1243
1244 udev = zd_usb_to_usbdev(usb);
1245 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1246 req, req_len, &actual_req_len, 1000 /* ms */);
1247 if (r) {
1248 dev_dbg_f(zd_usb_dev(usb),
1249 "error in usb_bulk_msg(). Error number %d\n", r);
1250 goto error;
1251 }
1252 if (req_len != actual_req_len) {
1253 dev_dbg_f(zd_usb_dev(usb),
1254 "error in usb_bulk_msg()"
1255 " req_len %d != actual_req_len %d\n",
1256 req_len, actual_req_len);
1257 r = -EIO;
1258 goto error;
1259 }
1260
1261 /* FALL-THROUGH with r == 0 */
1262 error:
1263 kfree(req);
1264 return r;
1265 }
1266
1267 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1268 {
1269 int r;
1270 struct usb_device *udev;
1271 struct usb_req_rfwrite *req = NULL;
1272 int i, req_len, actual_req_len;
1273 u16 bit_value_template;
1274
1275 if (in_atomic()) {
1276 dev_dbg_f(zd_usb_dev(usb),
1277 "error: io in atomic context not supported\n");
1278 return -EWOULDBLOCK;
1279 }
1280 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1281 dev_dbg_f(zd_usb_dev(usb),
1282 "error: bits %d are smaller than"
1283 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1284 bits, USB_MIN_RFWRITE_BIT_COUNT);
1285 return -EINVAL;
1286 }
1287 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1288 dev_dbg_f(zd_usb_dev(usb),
1289 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1290 bits, USB_MAX_RFWRITE_BIT_COUNT);
1291 return -EINVAL;
1292 }
1293 #ifdef DEBUG
1294 if (value & (~0UL << bits)) {
1295 dev_dbg_f(zd_usb_dev(usb),
1296 "error: value %#09x has bits >= %d set\n",
1297 value, bits);
1298 return -EINVAL;
1299 }
1300 #endif /* DEBUG */
1301
1302 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1303
1304 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1305 if (r) {
1306 dev_dbg_f(zd_usb_dev(usb),
1307 "error %d: Couldn't read CR203\n", r);
1308 goto out;
1309 }
1310 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1311
1312 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1313 req = kmalloc(req_len, GFP_NOFS);
1314 if (!req)
1315 return -ENOMEM;
1316
1317 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1318 /* 1: 3683a, but not used in ZYDAS driver */
1319 req->value = cpu_to_le16(2);
1320 req->bits = cpu_to_le16(bits);
1321
1322 for (i = 0; i < bits; i++) {
1323 u16 bv = bit_value_template;
1324 if (value & (1 << (bits-1-i)))
1325 bv |= RF_DATA;
1326 req->bit_values[i] = cpu_to_le16(bv);
1327 }
1328
1329 udev = zd_usb_to_usbdev(usb);
1330 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1331 req, req_len, &actual_req_len, 1000 /* ms */);
1332 if (r) {
1333 dev_dbg_f(zd_usb_dev(usb),
1334 "error in usb_bulk_msg(). Error number %d\n", r);
1335 goto out;
1336 }
1337 if (req_len != actual_req_len) {
1338 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1339 " req_len %d != actual_req_len %d\n",
1340 req_len, actual_req_len);
1341 r = -EIO;
1342 goto out;
1343 }
1344
1345 /* FALL-THROUGH with r == 0 */
1346 out:
1347 kfree(req);
1348 return r;
1349 }
linux 2.6 git repository for openrd