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[PATCH] bcm43xx-softmac: Fix an off-by-one condition in handle_irq_noise
[deliverable/linux.git] / drivers / net / wireless / zd1211rw / zd_usb.c
CommitLineData
e85d0918
DD		 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/init.h>
20#include <linux/module.h>
21#include <linux/firmware.h>
22#include <linux/device.h>
23#include <linux/errno.h>
24#include <linux/skbuff.h>
25#include <linux/usb.h>
26#include <net/ieee80211.h>
27
28#include "zd_def.h"
29#include "zd_netdev.h"
30#include "zd_mac.h"
31#include "zd_usb.h"
32#include "zd_util.h"
33
34static struct usb_device_id usb_ids[] = {
35 /* ZD1211 */
36 { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
37 { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
38 { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
39 { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
40 { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
41 { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
42 /* ZD1211B */
43 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
44 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
45 {}
46};
47
48MODULE_LICENSE("GPL");
49MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
50MODULE_AUTHOR("Ulrich Kunitz");
51MODULE_AUTHOR("Daniel Drake");
52MODULE_VERSION("1.0");
53MODULE_DEVICE_TABLE(usb, usb_ids);
54
55#define FW_ZD1211_PREFIX "zd1211/zd1211_"
56#define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
57
58/* register address handling */
59
60#ifdef DEBUG
61static int check_addr(struct zd_usb *usb, zd_addr_t addr)
62{
63 u32 base = ZD_ADDR_BASE(addr);
64 u32 offset = ZD_OFFSET(addr);
65
66 if ((u32)addr & ADDR_ZERO_MASK)
67 goto invalid_address;
68 switch (base) {
69 case USB_BASE:
70 break;
71 case CR_BASE:
72 if (offset > CR_MAX_OFFSET) {
73 dev_dbg(zd_usb_dev(usb),
74 "CR offset %#010x larger than"
75 " CR_MAX_OFFSET %#10x\n",
76 offset, CR_MAX_OFFSET);
77 goto invalid_address;
78 }
79 if (offset & 1) {
80 dev_dbg(zd_usb_dev(usb),
81 "CR offset %#010x is not a multiple of 2\n",
82 offset);
83 goto invalid_address;
84 }
85 break;
86 case E2P_BASE:
87 if (offset > E2P_MAX_OFFSET) {
88 dev_dbg(zd_usb_dev(usb),
89 "E2P offset %#010x larger than"
90 " E2P_MAX_OFFSET %#010x\n",
91 offset, E2P_MAX_OFFSET);
92 goto invalid_address;
93 }
94 break;
95 case FW_BASE:
96 if (!usb->fw_base_offset) {
97 dev_dbg(zd_usb_dev(usb),
98 "ERROR: fw base offset has not been set\n");
99 return -EAGAIN;
100 }
101 if (offset > FW_MAX_OFFSET) {
102 dev_dbg(zd_usb_dev(usb),
103 "FW offset %#10x is larger than"
104 " FW_MAX_OFFSET %#010x\n",
105 offset, FW_MAX_OFFSET);
106 goto invalid_address;
107 }
108 break;
109 default:
110 dev_dbg(zd_usb_dev(usb),
111 "address has unsupported base %#010x\n", addr);
112 goto invalid_address;
113 }
114
115 return 0;
116invalid_address:
117 dev_dbg(zd_usb_dev(usb),
118 "ERROR: invalid address: %#010x\n", addr);
119 return -EINVAL;
120}
121#endif /* DEBUG */
122
123static u16 usb_addr(struct zd_usb *usb, zd_addr_t addr)
124{
125 u32 base;
126 u16 offset;
127
128 base = ZD_ADDR_BASE(addr);
129 offset = ZD_OFFSET(addr);
130
131 ZD_ASSERT(check_addr(usb, addr) == 0);
132
133 switch (base) {
134 case CR_BASE:
135 offset += CR_BASE_OFFSET;
136 break;
137 case E2P_BASE:
138 offset += E2P_BASE_OFFSET;
139 break;
140 case FW_BASE:
141 offset += usb->fw_base_offset;
142 break;
143 }
144
145 return offset;
146}
147
148/* USB device initialization */
149
150static int request_fw_file(
151 const struct firmware **fw, const char *name, struct device *device)
152{
153 int r;
154
155 dev_dbg_f(device, "fw name %s\n", name);
156
157 r = request_firmware(fw, name, device);
158 if (r)
159 dev_err(device,
160 "Could not load firmware file %s. Error number %d\n",
161 name, r);
162 return r;
163}
164
165static inline u16 get_bcdDevice(const struct usb_device *udev)
166{
167 return le16_to_cpu(udev->descriptor.bcdDevice);
168}
169
170enum upload_code_flags {
171 REBOOT = 1,
172};
173
174/* Ensures that MAX_TRANSFER_SIZE is even. */
175#define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
176
177static int upload_code(struct usb_device *udev,
178 const u8 *data, size_t size, u16 code_offset, int flags)
179{
180 u8 *p;
181 int r;
182
183 /* USB request blocks need "kmalloced" buffers.
184 */
185 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
186 if (!p) {
187 dev_err(&udev->dev, "out of memory\n");
188 r = -ENOMEM;
189 goto error;
190 }
191
192 size &= ~1;
193 while (size > 0) {
194 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
195 size : MAX_TRANSFER_SIZE;
196
197 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
198
199 memcpy(p, data, transfer_size);
200 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
201 USB_REQ_FIRMWARE_DOWNLOAD,
202 USB_DIR_OUT | USB_TYPE_VENDOR,
203 code_offset, 0, p, transfer_size, 1000 /* ms */);
204 if (r < 0) {
205 dev_err(&udev->dev,
206 "USB control request for firmware upload"
207 " failed. Error number %d\n", r);
208 goto error;
209 }
210 transfer_size = r & ~1;
211
212 size -= transfer_size;
213 data += transfer_size;
214 code_offset += transfer_size/sizeof(u16);
215 }
216
217 if (flags & REBOOT) {
218 u8 ret;
219
220 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
221 USB_REQ_FIRMWARE_CONFIRM,
222 USB_DIR_IN | USB_TYPE_VENDOR,
223 0, 0, &ret, sizeof(ret), 5000 /* ms */);
224 if (r != sizeof(ret)) {
225 dev_err(&udev->dev,
226 "control request firmeware confirmation failed."
227 " Return value %d\n", r);
228 if (r >= 0)
229 r = -ENODEV;
230 goto error;
231 }
232 if (ret & 0x80) {
233 dev_err(&udev->dev,
234 "Internal error while downloading."
235 " Firmware confirm return value %#04x\n",
236 (unsigned int)ret);
237 r = -ENODEV;
238 goto error;
239 }
240 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
241 (unsigned int)ret);
242 }
243
244 r = 0;
245error:
246 kfree(p);
247 return r;
248}
249
250static u16 get_word(const void *data, u16 offset)
251{
252 const __le16 *p = data;
253 return le16_to_cpu(p[offset]);
254}
255
256static char *get_fw_name(char *buffer, size_t size, u8 device_type,
257 const char* postfix)
258{
259 scnprintf(buffer, size, "%s%s",
260 device_type == DEVICE_ZD1211B ?
261 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
262 postfix);
263 return buffer;
264}
265
266static int upload_firmware(struct usb_device *udev, u8 device_type)
267{
268 int r;
269 u16 fw_bcdDevice;
270 u16 bcdDevice;
271 const struct firmware *ub_fw = NULL;
272 const struct firmware *uph_fw = NULL;
273 char fw_name[128];
274
275 bcdDevice = get_bcdDevice(udev);
276
277 r = request_fw_file(&ub_fw,
278 get_fw_name(fw_name, sizeof(fw_name), device_type, "ub"),
279 &udev->dev);
280 if (r)
281 goto error;
282
283 fw_bcdDevice = get_word(ub_fw->data, EEPROM_REGS_OFFSET);
284
285 /* FIXME: do we have any reason to perform the kludge that the vendor
286 * driver does when there is a version mismatch? (their driver uploads
287 * different firmwares and stuff)
288 */
289 if (fw_bcdDevice != bcdDevice) {
290 dev_info(&udev->dev,
291 "firmware device id %#06x and actual device id "
292 "%#06x differ, continuing anyway\n",
293 fw_bcdDevice, bcdDevice);
294 } else {
295 dev_dbg_f(&udev->dev,
296 "firmware device id %#06x is equal to the "
297 "actual device id\n", fw_bcdDevice);
298 }
299
300
301 r = request_fw_file(&uph_fw,
302 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
303 &udev->dev);
304 if (r)
305 goto error;
306
307 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START_OFFSET,
308 REBOOT);
309 if (r) {
310 dev_err(&udev->dev,
311 "Could not upload firmware code uph. Error number %d\n",
312 r);
313 }
314
315 /* FALL-THROUGH */
316error:
317 release_firmware(ub_fw);
318 release_firmware(uph_fw);
319 return r;
320}
321
322static void disable_read_regs_int(struct zd_usb *usb)
323{
324 struct zd_usb_interrupt *intr = &usb->intr;
325
326 ZD_ASSERT(in_interrupt());
327 spin_lock(&intr->lock);
328 intr->read_regs_enabled = 0;
329 spin_unlock(&intr->lock);
330}
331
332#define urb_dev(urb) (&(urb)->dev->dev)
333
334static inline void handle_regs_int(struct urb *urb)
335{
336 struct zd_usb *usb = urb->context;
337 struct zd_usb_interrupt *intr = &usb->intr;
338 int len;
339
340 ZD_ASSERT(in_interrupt());
341 spin_lock(&intr->lock);
342
343 if (intr->read_regs_enabled) {
344 intr->read_regs.length = len = urb->actual_length;
345
346 if (len > sizeof(intr->read_regs.buffer))
347 len = sizeof(intr->read_regs.buffer);
348 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
349 intr->read_regs_enabled = 0;
350 complete(&intr->read_regs.completion);
351 goto out;
352 }
353
354 dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
355out:
356 spin_unlock(&intr->lock);
357}
358
359static inline void handle_retry_failed_int(struct urb *urb)
360{
361 dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
362}
363
364
365static void int_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
366{
367 int r;
368 struct usb_int_header *hdr;
369
370 switch (urb->status) {
371 case 0:
372 break;
373 case -ESHUTDOWN:
374 case -EINVAL:
375 case -ENODEV:
376 case -ENOENT:
377 case -ECONNRESET:
378 goto kfree;
379 case -EPIPE:
380 usb_clear_halt(urb->dev, EP_INT_IN);
381 /* FALL-THROUGH */
382 default:
383 goto resubmit;
384 }
385
386 if (urb->actual_length < sizeof(hdr)) {
387 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
388 goto resubmit;
389 }
390
391 hdr = urb->transfer_buffer;
392 if (hdr->type != USB_INT_TYPE) {
393 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
394 goto resubmit;
395 }
396
397 switch (hdr->id) {
398 case USB_INT_ID_REGS:
399 handle_regs_int(urb);
400 break;
401 case USB_INT_ID_RETRY_FAILED:
402 handle_retry_failed_int(urb);
403 break;
404 default:
405 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
406 (unsigned int)hdr->id);
407 goto resubmit;
408 }
409
410resubmit:
411 r = usb_submit_urb(urb, GFP_ATOMIC);
412 if (r) {
413 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
414 goto kfree;
415 }
416 return;
417kfree:
418 kfree(urb->transfer_buffer);
419}
420
421static inline int int_urb_interval(struct usb_device *udev)
422{
423 switch (udev->speed) {
424 case USB_SPEED_HIGH:
425 return 4;
426 case USB_SPEED_LOW:
427 return 10;
428 case USB_SPEED_FULL:
429 default:
430 return 1;
431 }
432}
433
434static inline int usb_int_enabled(struct zd_usb *usb)
435{
436 unsigned long flags;
437 struct zd_usb_interrupt *intr = &usb->intr;
438 struct urb *urb;
439
440 spin_lock_irqsave(&intr->lock, flags);
441 urb = intr->urb;
442 spin_unlock_irqrestore(&intr->lock, flags);
443 return urb != NULL;
444}
445
446int zd_usb_enable_int(struct zd_usb *usb)
447{
448 int r;
449 struct usb_device *udev;
450 struct zd_usb_interrupt *intr = &usb->intr;
451 void *transfer_buffer = NULL;
452 struct urb *urb;
453
454 dev_dbg_f(zd_usb_dev(usb), "\n");
455
456 urb = usb_alloc_urb(0, GFP_NOFS);
457 if (!urb) {
458 r = -ENOMEM;
459 goto out;
460 }
461
462 ZD_ASSERT(!irqs_disabled());
463 spin_lock_irq(&intr->lock);
464 if (intr->urb) {
465 spin_unlock_irq(&intr->lock);
466 r = 0;
467 goto error_free_urb;
468 }
469 intr->urb = urb;
470 spin_unlock_irq(&intr->lock);
471
472 /* TODO: make it a DMA buffer */
473 r = -ENOMEM;
474 transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_NOFS);
475 if (!transfer_buffer) {
476 dev_dbg_f(zd_usb_dev(usb),
477 "couldn't allocate transfer_buffer\n");
478 goto error_set_urb_null;
479 }
480
481 udev = zd_usb_to_usbdev(usb);
482 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
483 transfer_buffer, USB_MAX_EP_INT_BUFFER,
484 int_urb_complete, usb,
485 intr->interval);
486
487 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
488 r = usb_submit_urb(urb, GFP_NOFS);
489 if (r) {
490 dev_dbg_f(zd_usb_dev(usb),
491 "Couldn't submit urb. Error number %d\n", r);
492 goto error;
493 }
494
495 return 0;
496error:
497 kfree(transfer_buffer);
498error_set_urb_null:
499 spin_lock_irq(&intr->lock);
500 intr->urb = NULL;
501 spin_unlock_irq(&intr->lock);
502error_free_urb:
503 usb_free_urb(urb);
504out:
505 return r;
506}
507
508void zd_usb_disable_int(struct zd_usb *usb)
509{
510 unsigned long flags;
511 struct zd_usb_interrupt *intr = &usb->intr;
512 struct urb *urb;
513
514 spin_lock_irqsave(&intr->lock, flags);
515 urb = intr->urb;
516 if (!urb) {
517 spin_unlock_irqrestore(&intr->lock, flags);
518 return;
519 }
520 intr->urb = NULL;
521 spin_unlock_irqrestore(&intr->lock, flags);
522
523 usb_kill_urb(urb);
524 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
525 usb_free_urb(urb);
526}
527
528static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
529 unsigned int length)
530{
531 int i;
532 struct zd_mac *mac = zd_usb_to_mac(usb);
533 const struct rx_length_info *length_info;
534
535 if (length < sizeof(struct rx_length_info)) {
536 /* It's not a complete packet anyhow. */
537 return;
538 }
539 length_info = (struct rx_length_info *)
540 (buffer + length - sizeof(struct rx_length_info));
541
542 /* It might be that three frames are merged into a single URB
543 * transaction. We have to check for the length info tag.
544 *
545 * While testing we discovered that length_info might be unaligned,
546 * because if USB transactions are merged, the last packet will not
547 * be padded. Unaligned access might also happen if the length_info
548 * structure is not present.
549 */
550 if (get_unaligned(&length_info->tag) == RX_LENGTH_INFO_TAG) {
551 unsigned int l, k, n;
552 for (i = 0, l = 0;; i++) {
553 k = le16_to_cpu(get_unaligned(
554 &length_info->length[i]));
555 n = l+k;
556 if (n > length)
557 return;
558 zd_mac_rx(mac, buffer+l, k);
559 if (i >= 2)
560 return;
561 l = (n+3) & ~3;
562 }
563 } else {
564 zd_mac_rx(mac, buffer, length);
565 }
566}
567
568static void rx_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
569{
570 struct zd_usb *usb;
571 struct zd_usb_rx *rx;
572 const u8 *buffer;
573 unsigned int length;
574
575 switch (urb->status) {
576 case 0:
577 break;
578 case -ESHUTDOWN:
579 case -EINVAL:
580 case -ENODEV:
581 case -ENOENT:
582 case -ECONNRESET:
583 return;
584 case -EPIPE:
585 usb_clear_halt(urb->dev, EP_DATA_IN);
586 /* FALL-THROUGH */
587 default:
588 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
589 goto resubmit;
590 }
591
592 buffer = urb->transfer_buffer;
593 length = urb->actual_length;
594 usb = urb->context;
595 rx = &usb->rx;
596
597 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
598 /* If there is an old first fragment, we don't care. */
599 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
600 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
601 spin_lock(&rx->lock);
602 memcpy(rx->fragment, buffer, length);
603 rx->fragment_length = length;
604 spin_unlock(&rx->lock);
605 goto resubmit;
606 }
607
608 spin_lock(&rx->lock);
609 if (rx->fragment_length > 0) {
610 /* We are on a second fragment, we believe */
611 ZD_ASSERT(length + rx->fragment_length <=
612 ARRAY_SIZE(rx->fragment));
613 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
614 memcpy(rx->fragment+rx->fragment_length, buffer, length);
615 handle_rx_packet(usb, rx->fragment,
616 rx->fragment_length + length);
617 rx->fragment_length = 0;
618 spin_unlock(&rx->lock);
619 } else {
620 spin_unlock(&rx->lock);
621 handle_rx_packet(usb, buffer, length);
622 }
623
624resubmit:
625 usb_submit_urb(urb, GFP_ATOMIC);
626}
627
628struct urb *alloc_urb(struct zd_usb *usb)
629{
630 struct usb_device *udev = zd_usb_to_usbdev(usb);
631 struct urb *urb;
632 void *buffer;
633
634 urb = usb_alloc_urb(0, GFP_NOFS);
635 if (!urb)
636 return NULL;
637 buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS,
638 &urb->transfer_dma);
639 if (!buffer) {
640 usb_free_urb(urb);
641 return NULL;
642 }
643
644 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
645 buffer, USB_MAX_RX_SIZE,
646 rx_urb_complete, usb);
647 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
648
649 return urb;
650}
651
652void free_urb(struct urb *urb)
653{
654 if (!urb)
655 return;
656 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
657 urb->transfer_buffer, urb->transfer_dma);
658 usb_free_urb(urb);
659}
660
661int zd_usb_enable_rx(struct zd_usb *usb)
662{
663 int i, r;
664 struct zd_usb_rx *rx = &usb->rx;
665 struct urb **urbs;
666
667 dev_dbg_f(zd_usb_dev(usb), "\n");
668
669 r = -ENOMEM;
670 urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS);
671 if (!urbs)
672 goto error;
673 for (i = 0; i < URBS_COUNT; i++) {
674 urbs[i] = alloc_urb(usb);
675 if (!urbs[i])
676 goto error;
677 }
678
679 ZD_ASSERT(!irqs_disabled());
680 spin_lock_irq(&rx->lock);
681 if (rx->urbs) {
682 spin_unlock_irq(&rx->lock);
683 r = 0;
684 goto error;
685 }
686 rx->urbs = urbs;
687 rx->urbs_count = URBS_COUNT;
688 spin_unlock_irq(&rx->lock);
689
690 for (i = 0; i < URBS_COUNT; i++) {
691 r = usb_submit_urb(urbs[i], GFP_NOFS);
692 if (r)
693 goto error_submit;
694 }
695
696 return 0;
697error_submit:
698 for (i = 0; i < URBS_COUNT; i++) {
699 usb_kill_urb(urbs[i]);
700 }
701 spin_lock_irq(&rx->lock);
702 rx->urbs = NULL;
703 rx->urbs_count = 0;
704 spin_unlock_irq(&rx->lock);
705error:
706 if (urbs) {
707 for (i = 0; i < URBS_COUNT; i++)
708 free_urb(urbs[i]);
709 }
710 return r;
711}
712
713void zd_usb_disable_rx(struct zd_usb *usb)
714{
715 int i;
716 unsigned long flags;
717 struct urb **urbs;
718 unsigned int count;
719 struct zd_usb_rx *rx = &usb->rx;
720
721 spin_lock_irqsave(&rx->lock, flags);
722 urbs = rx->urbs;
723 count = rx->urbs_count;
724 spin_unlock_irqrestore(&rx->lock, flags);
725 if (!urbs)
726 return;
727
728 for (i = 0; i < count; i++) {
729 usb_kill_urb(urbs[i]);
730 free_urb(urbs[i]);
731 }
732 kfree(urbs);
733
734 spin_lock_irqsave(&rx->lock, flags);
735 rx->urbs = NULL;
736 rx->urbs_count = 0;
737 spin_unlock_irqrestore(&rx->lock, flags);
738}
739
740static void tx_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
741{
742 int r;
743
744 switch (urb->status) {
745 case 0:
746 break;
747 case -ESHUTDOWN:
748 case -EINVAL:
749 case -ENODEV:
750 case -ENOENT:
751 case -ECONNRESET:
752 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
753 break;
754 case -EPIPE:
755 usb_clear_halt(urb->dev, EP_DATA_OUT);
756 /* FALL-THROUGH */
757 default:
758 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
759 goto resubmit;
760 }
761free_urb:
762 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
763 urb->transfer_buffer, urb->transfer_dma);
764 usb_free_urb(urb);
765 return;
766resubmit:
767 r = usb_submit_urb(urb, GFP_ATOMIC);
768 if (r) {
769 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
770 goto free_urb;
771 }
772}
773
774/* Puts the frame on the USB endpoint. It doesn't wait for
775 * completion. The frame must contain the control set.
776 */
777int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
778{
779 int r;
780 struct usb_device *udev = zd_usb_to_usbdev(usb);
781 struct urb *urb;
782 void *buffer;
783
784 urb = usb_alloc_urb(0, GFP_ATOMIC);
785 if (!urb) {
786 r = -ENOMEM;
787 goto out;
788 }
789
790 buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
791 &urb->transfer_dma);
792 if (!buffer) {
793 r = -ENOMEM;
794 goto error_free_urb;
795 }
796 memcpy(buffer, frame, length);
797
798 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
799 buffer, length, tx_urb_complete, NULL);
800 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
801
802 r = usb_submit_urb(urb, GFP_ATOMIC);
803 if (r)
804 goto error;
805 return 0;
806error:
807 usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
808 urb->transfer_dma);
809error_free_urb:
810 usb_free_urb(urb);
811out:
812 return r;
813}
814
815static inline void init_usb_interrupt(struct zd_usb *usb)
816{
817 struct zd_usb_interrupt *intr = &usb->intr;
818
819 spin_lock_init(&intr->lock);
820 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
821 init_completion(&intr->read_regs.completion);
822 intr->read_regs.cr_int_addr = cpu_to_le16(usb_addr(usb, CR_INTERRUPT));
823}
824
825static inline void init_usb_rx(struct zd_usb *usb)
826{
827 struct zd_usb_rx *rx = &usb->rx;
828 spin_lock_init(&rx->lock);
829 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
830 rx->usb_packet_size = 512;
831 } else {
832 rx->usb_packet_size = 64;
833 }
834 ZD_ASSERT(rx->fragment_length == 0);
835}
836
837static inline void init_usb_tx(struct zd_usb *usb)
838{
839 /* FIXME: at this point we will allocate a fixed number of urb's for
840 * use in a cyclic scheme */
841}
842
843void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
844 struct usb_interface *intf)
845{
846 memset(usb, 0, sizeof(*usb));
847 usb->intf = usb_get_intf(intf);
848 usb_set_intfdata(usb->intf, netdev);
849 init_usb_interrupt(usb);
850 init_usb_tx(usb);
851 init_usb_rx(usb);
852}
853
854int zd_usb_init_hw(struct zd_usb *usb)
855{
856 int r;
857 struct zd_chip *chip = zd_usb_to_chip(usb);
858
859 ZD_ASSERT(mutex_is_locked(&chip->mutex));
860 r = zd_ioread16_locked(chip, &usb->fw_base_offset,
861 USB_REG((u16)FW_BASE_ADDR_OFFSET));
862 if (r)
863 return r;
864 dev_dbg_f(zd_usb_dev(usb), "fw_base_offset: %#06hx\n",
865 usb->fw_base_offset);
866
867 return 0;
868}
869
870void zd_usb_clear(struct zd_usb *usb)
871{
872 usb_set_intfdata(usb->intf, NULL);
873 usb_put_intf(usb->intf);
874 memset(usb, 0, sizeof(*usb));
875 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
876}
877
878static const char *speed(enum usb_device_speed speed)
879{
880 switch (speed) {
881 case USB_SPEED_LOW:
882 return "low";
883 case USB_SPEED_FULL:
884 return "full";
885 case USB_SPEED_HIGH:
886 return "high";
887 default:
888 return "unknown speed";
889 }
890}
891
892static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
893{
894 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
895 le16_to_cpu(udev->descriptor.idVendor),
896 le16_to_cpu(udev->descriptor.idProduct),
897 get_bcdDevice(udev),
898 speed(udev->speed));
899}
900
901int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
902{
903 struct usb_device *udev = interface_to_usbdev(usb->intf);
904 return scnprint_id(udev, buffer, size);
905}
906
907#ifdef DEBUG
908static void print_id(struct usb_device *udev)
909{
910 char buffer[40];
911
912 scnprint_id(udev, buffer, sizeof(buffer));
913 buffer[sizeof(buffer)-1] = 0;
914 dev_dbg_f(&udev->dev, "%s\n", buffer);
915}
916#else
917#define print_id(udev) do { } while (0)
918#endif
919
920static int probe(struct usb_interface *intf, const struct usb_device_id *id)
921{
922 int r;
923 struct usb_device *udev = interface_to_usbdev(intf);
924 struct net_device *netdev = NULL;
925
926 print_id(udev);
927
928 switch (udev->speed) {
929 case USB_SPEED_LOW:
930 case USB_SPEED_FULL:
931 case USB_SPEED_HIGH:
932 break;
933 default:
934 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
935 r = -ENODEV;
936 goto error;
937 }
938
939 netdev = zd_netdev_alloc(intf);
940 if (netdev == NULL) {
941 r = -ENOMEM;
942 goto error;
943 }
944
945 r = upload_firmware(udev, id->driver_info);
946 if (r) {
947 dev_err(&intf->dev,
948 "couldn't load firmware. Error number %d\n", r);
949 goto error;
950 }
951
952 r = usb_reset_configuration(udev);
953 if (r) {
954 dev_dbg_f(&intf->dev,
955 "couldn't reset configuration. Error number %d\n", r);
956 goto error;
957 }
958
959 /* At this point the interrupt endpoint is not generally enabled. We
960 * save the USB bandwidth until the network device is opened. But
961 * notify that the initialization of the MAC will require the
962 * interrupts to be temporary enabled.
963 */
964 r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
965 if (r) {
966 dev_dbg_f(&intf->dev,
967 "couldn't initialize mac. Error number %d\n", r);
968 goto error;
969 }
970
971 r = register_netdev(netdev);
972 if (r) {
973 dev_dbg_f(&intf->dev,
974 "couldn't register netdev. Error number %d\n", r);
975 goto error;
976 }
977
978 dev_dbg_f(&intf->dev, "successful\n");
979 dev_info(&intf->dev,"%s\n", netdev->name);
980 return 0;
981error:
982 usb_reset_device(interface_to_usbdev(intf));
983 zd_netdev_free(netdev);
984 return r;
985}
986
987static void disconnect(struct usb_interface *intf)
988{
989 struct net_device *netdev = zd_intf_to_netdev(intf);
990 struct zd_mac *mac = zd_netdev_mac(netdev);
991 struct zd_usb *usb = &mac->chip.usb;
992
993 dev_dbg_f(zd_usb_dev(usb), "\n");
994
995 zd_netdev_disconnect(netdev);
996
997 /* Just in case something has gone wrong! */
998 zd_usb_disable_rx(usb);
999 zd_usb_disable_int(usb);
1000
1001 /* If the disconnect has been caused by a removal of the
1002 * driver module, the reset allows reloading of the driver. If the
1003 * reset will not be executed here, the upload of the firmware in the
1004 * probe function caused by the reloading of the driver will fail.
1005 */
1006 usb_reset_device(interface_to_usbdev(intf));
1007
1008 /* If somebody still waits on this lock now, this is an error. */
1009 zd_netdev_free(netdev);
1010 dev_dbg(&intf->dev, "disconnected\n");
1011}
1012
1013static struct usb_driver driver = {
1014 .name = "zd1211rw",
1015 .id_table = usb_ids,
1016 .probe = probe,
1017 .disconnect = disconnect,
1018};
1019
1020static int __init usb_init(void)
1021{
1022 int r;
1023
1024 pr_debug("usb_init()\n");
1025
1026 r = usb_register(&driver);
1027 if (r) {
1028 printk(KERN_ERR "usb_register() failed. Error number %d\n", r);
1029 return r;
1030 }
1031
1032 pr_debug("zd1211rw initialized\n");
1033 return 0;
1034}
1035
1036static void __exit usb_exit(void)
1037{
1038 pr_debug("usb_exit()\n");
1039 usb_deregister(&driver);
1040}
1041
1042module_init(usb_init);
1043module_exit(usb_exit);
1044
1045static int usb_int_regs_length(unsigned int count)
1046{
1047 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1048}
1049
1050static void prepare_read_regs_int(struct zd_usb *usb)
1051{
1052 struct zd_usb_interrupt *intr = &usb->intr;
1053
1054 spin_lock(&intr->lock);
1055 intr->read_regs_enabled = 1;
1056 INIT_COMPLETION(intr->read_regs.completion);
1057 spin_unlock(&intr->lock);
1058}
1059
1060static int get_results(struct zd_usb *usb, u16 *values,
1061 struct usb_req_read_regs *req, unsigned int count)
1062{
1063 int r;
1064 int i;
1065 struct zd_usb_interrupt *intr = &usb->intr;
1066 struct read_regs_int *rr = &intr->read_regs;
1067 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1068
1069 spin_lock(&intr->lock);
1070
1071 r = -EIO;
1072 /* The created block size seems to be larger than expected.
1073 * However results appear to be correct.
1074 */
1075 if (rr->length < usb_int_regs_length(count)) {
1076 dev_dbg_f(zd_usb_dev(usb),
1077 "error: actual length %d less than expected %d\n",
1078 rr->length, usb_int_regs_length(count));
1079 goto error_unlock;
1080 }
1081 if (rr->length > sizeof(rr->buffer)) {
1082 dev_dbg_f(zd_usb_dev(usb),
1083 "error: actual length %d exceeds buffer size %zu\n",
1084 rr->length, sizeof(rr->buffer));
1085 goto error_unlock;
1086 }
1087
1088 for (i = 0; i < count; i++) {
1089 struct reg_data *rd = &regs->regs[i];
1090 if (rd->addr != req->addr[i]) {
1091 dev_dbg_f(zd_usb_dev(usb),
1092 "rd[%d] addr %#06hx expected %#06hx\n", i,
1093 le16_to_cpu(rd->addr),
1094 le16_to_cpu(req->addr[i]));
1095 goto error_unlock;
1096 }
1097 values[i] = le16_to_cpu(rd->value);
1098 }
1099
1100 r = 0;
1101error_unlock:
1102 spin_unlock(&intr->lock);
1103 return r;
1104}
1105
1106int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1107 const zd_addr_t *addresses, unsigned int count)
1108{
1109 int r;
1110 int i, req_len, actual_req_len;
1111 struct usb_device *udev;
1112 struct usb_req_read_regs *req = NULL;
1113 unsigned long timeout;
1114
1115 if (count < 1) {
1116 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1117 return -EINVAL;
1118 }
1119 if (count > USB_MAX_IOREAD16_COUNT) {
1120 dev_dbg_f(zd_usb_dev(usb),
1121 "error: count %u exceeds possible max %u\n",
1122 count, USB_MAX_IOREAD16_COUNT);
1123 return -EINVAL;
1124 }
1125 if (in_atomic()) {
1126 dev_dbg_f(zd_usb_dev(usb),
1127 "error: io in atomic context not supported\n");
1128 return -EWOULDBLOCK;
1129 }
1130 if (!usb_int_enabled(usb)) {
1131 dev_dbg_f(zd_usb_dev(usb),
1132 "error: usb interrupt not enabled\n");
1133 return -EWOULDBLOCK;
1134 }
1135
1136 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1137 req = kmalloc(req_len, GFP_NOFS);
1138 if (!req)
1139 return -ENOMEM;
1140 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1141 for (i = 0; i < count; i++)
1142 req->addr[i] = cpu_to_le16(usb_addr(usb, addresses[i]));
1143
1144 udev = zd_usb_to_usbdev(usb);
1145 prepare_read_regs_int(usb);
1146 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1147 req, req_len, &actual_req_len, 1000 /* ms */);
1148 if (r) {
1149 dev_dbg_f(zd_usb_dev(usb),
1150 "error in usb_bulk_msg(). Error number %d\n", r);
1151 goto error;
1152 }
1153 if (req_len != actual_req_len) {
1154 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1155 " req_len %d != actual_req_len %d\n",
1156 req_len, actual_req_len);
1157 r = -EIO;
1158 goto error;
1159 }
1160
1161 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1162 msecs_to_jiffies(1000));
1163 if (!timeout) {
1164 disable_read_regs_int(usb);
1165 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1166 r = -ETIMEDOUT;
1167 goto error;
1168 }
1169
1170 r = get_results(usb, values, req, count);
1171error:
1172 kfree(req);
1173 return r;
1174}
1175
1176int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1177 unsigned int count)
1178{
1179 int r;
1180 struct usb_device *udev;
1181 struct usb_req_write_regs *req = NULL;
1182 int i, req_len, actual_req_len;
1183
1184 if (count == 0)
1185 return 0;
1186 if (count > USB_MAX_IOWRITE16_COUNT) {
1187 dev_dbg_f(zd_usb_dev(usb),
1188 "error: count %u exceeds possible max %u\n",
1189 count, USB_MAX_IOWRITE16_COUNT);
1190 return -EINVAL;
1191 }
1192 if (in_atomic()) {
1193 dev_dbg_f(zd_usb_dev(usb),
1194 "error: io in atomic context not supported\n");
1195 return -EWOULDBLOCK;
1196 }
1197
1198 req_len = sizeof(struct usb_req_write_regs) +
1199 count * sizeof(struct reg_data);
1200 req = kmalloc(req_len, GFP_NOFS);
1201 if (!req)
1202 return -ENOMEM;
1203
1204 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1205 for (i = 0; i < count; i++) {
1206 struct reg_data *rw = &req->reg_writes[i];
1207 rw->addr = cpu_to_le16(usb_addr(usb, ioreqs[i].addr));
1208 rw->value = cpu_to_le16(ioreqs[i].value);
1209 }
1210
1211 udev = zd_usb_to_usbdev(usb);
1212 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1213 req, req_len, &actual_req_len, 1000 /* ms */);
1214 if (r) {
1215 dev_dbg_f(zd_usb_dev(usb),
1216 "error in usb_bulk_msg(). Error number %d\n", r);
1217 goto error;
1218 }
1219 if (req_len != actual_req_len) {
1220 dev_dbg_f(zd_usb_dev(usb),
1221 "error in usb_bulk_msg()"
1222 " req_len %d != actual_req_len %d\n",
1223 req_len, actual_req_len);
1224 r = -EIO;
1225 goto error;
1226 }
1227
1228 /* FALL-THROUGH with r == 0 */
1229error:
1230 kfree(req);
1231 return r;
1232}
1233
1234int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1235{
1236 int r;
1237 struct usb_device *udev;
1238 struct usb_req_rfwrite *req = NULL;
1239 int i, req_len, actual_req_len;
1240 u16 bit_value_template;
1241
1242 if (in_atomic()) {
1243 dev_dbg_f(zd_usb_dev(usb),
1244 "error: io in atomic context not supported\n");
1245 return -EWOULDBLOCK;
1246 }
1247 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1248 dev_dbg_f(zd_usb_dev(usb),
1249 "error: bits %d are smaller than"
1250 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1251 bits, USB_MIN_RFWRITE_BIT_COUNT);
1252 return -EINVAL;
1253 }
1254 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1255 dev_dbg_f(zd_usb_dev(usb),
1256 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1257 bits, USB_MAX_RFWRITE_BIT_COUNT);
1258 return -EINVAL;
1259 }
1260#ifdef DEBUG
1261 if (value & (~0UL << bits)) {
1262 dev_dbg_f(zd_usb_dev(usb),
1263 "error: value %#09x has bits >= %d set\n",
1264 value, bits);
1265 return -EINVAL;
1266 }
1267#endif /* DEBUG */
1268
1269 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1270
1271 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1272 if (r) {
1273 dev_dbg_f(zd_usb_dev(usb),
1274 "error %d: Couldn't read CR203\n", r);
1275 goto out;
1276 }
1277 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1278
1279 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1280 req = kmalloc(req_len, GFP_NOFS);
1281 if (!req)
1282 return -ENOMEM;
1283
1284 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1285 /* 1: 3683a, but not used in ZYDAS driver */
1286 req->value = cpu_to_le16(2);
1287 req->bits = cpu_to_le16(bits);
1288
1289 for (i = 0; i < bits; i++) {
1290 u16 bv = bit_value_template;
1291 if (value & (1 << (bits-1-i)))
1292 bv |= RF_DATA;
1293 req->bit_values[i] = cpu_to_le16(bv);
1294 }
1295
1296 udev = zd_usb_to_usbdev(usb);
1297 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1298 req, req_len, &actual_req_len, 1000 /* ms */);
1299 if (r) {
1300 dev_dbg_f(zd_usb_dev(usb),
1301 "error in usb_bulk_msg(). Error number %d\n", r);
1302 goto out;
1303 }
1304 if (req_len != actual_req_len) {
1305 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1306 " req_len %d != actual_req_len %d\n",
1307 req_len, actual_req_len);
1308 r = -EIO;
1309 goto out;
1310 }
1311
1312 /* FALL-THROUGH with r == 0 */
1313out:
1314 kfree(req);
1315 return r;
1316}
Linux kernel - Deliverables
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