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[PATCH] zd1211rw: Add ID for Allnet ALLSPOT Hotspot finder
[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 },
dd2f5538 42 { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
1b865491 43 { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
12f39308 44 { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
e85d0918
DD		 45 /* ZD1211B */
46 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
47 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
dd2f5538 48 { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
e85d0918
DD		 49 {}
50};
51
52MODULE_LICENSE("GPL");
53MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
54MODULE_AUTHOR("Ulrich Kunitz");
55MODULE_AUTHOR("Daniel Drake");
56MODULE_VERSION("1.0");
57MODULE_DEVICE_TABLE(usb, usb_ids);
58
59#define FW_ZD1211_PREFIX "zd1211/zd1211_"
60#define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
61
62/* register address handling */
63
64#ifdef DEBUG
65static int check_addr(struct zd_usb *usb, zd_addr_t addr)
66{
67 u32 base = ZD_ADDR_BASE(addr);
68 u32 offset = ZD_OFFSET(addr);
69
70 if ((u32)addr & ADDR_ZERO_MASK)
71 goto invalid_address;
72 switch (base) {
73 case USB_BASE:
74 break;
75 case CR_BASE:
76 if (offset > CR_MAX_OFFSET) {
77 dev_dbg(zd_usb_dev(usb),
78 "CR offset %#010x larger than"
79 " CR_MAX_OFFSET %#10x\n",
80 offset, CR_MAX_OFFSET);
81 goto invalid_address;
82 }
83 if (offset & 1) {
84 dev_dbg(zd_usb_dev(usb),
85 "CR offset %#010x is not a multiple of 2\n",
86 offset);
87 goto invalid_address;
88 }
89 break;
90 case E2P_BASE:
91 if (offset > E2P_MAX_OFFSET) {
92 dev_dbg(zd_usb_dev(usb),
93 "E2P offset %#010x larger than"
94 " E2P_MAX_OFFSET %#010x\n",
95 offset, E2P_MAX_OFFSET);
96 goto invalid_address;
97 }
98 break;
99 case FW_BASE:
100 if (!usb->fw_base_offset) {
101 dev_dbg(zd_usb_dev(usb),
102 "ERROR: fw base offset has not been set\n");
103 return -EAGAIN;
104 }
105 if (offset > FW_MAX_OFFSET) {
106 dev_dbg(zd_usb_dev(usb),
107 "FW offset %#10x is larger than"
108 " FW_MAX_OFFSET %#010x\n",
109 offset, FW_MAX_OFFSET);
110 goto invalid_address;
111 }
112 break;
113 default:
114 dev_dbg(zd_usb_dev(usb),
115 "address has unsupported base %#010x\n", addr);
116 goto invalid_address;
117 }
118
119 return 0;
120invalid_address:
121 dev_dbg(zd_usb_dev(usb),
122 "ERROR: invalid address: %#010x\n", addr);
123 return -EINVAL;
124}
125#endif /* DEBUG */
126
127static u16 usb_addr(struct zd_usb *usb, zd_addr_t addr)
128{
129 u32 base;
130 u16 offset;
131
132 base = ZD_ADDR_BASE(addr);
133 offset = ZD_OFFSET(addr);
134
135 ZD_ASSERT(check_addr(usb, addr) == 0);
136
137 switch (base) {
138 case CR_BASE:
139 offset += CR_BASE_OFFSET;
140 break;
141 case E2P_BASE:
142 offset += E2P_BASE_OFFSET;
143 break;
144 case FW_BASE:
145 offset += usb->fw_base_offset;
146 break;
147 }
148
149 return offset;
150}
151
152/* USB device initialization */
153
154static int request_fw_file(
155 const struct firmware **fw, const char *name, struct device *device)
156{
157 int r;
158
159 dev_dbg_f(device, "fw name %s\n", name);
160
161 r = request_firmware(fw, name, device);
162 if (r)
163 dev_err(device,
164 "Could not load firmware file %s. Error number %d\n",
165 name, r);
166 return r;
167}
168
169static inline u16 get_bcdDevice(const struct usb_device *udev)
170{
171 return le16_to_cpu(udev->descriptor.bcdDevice);
172}
173
174enum upload_code_flags {
175 REBOOT = 1,
176};
177
178/* Ensures that MAX_TRANSFER_SIZE is even. */
179#define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
180
181static int upload_code(struct usb_device *udev,
182 const u8 *data, size_t size, u16 code_offset, int flags)
183{
184 u8 *p;
185 int r;
186
187 /* USB request blocks need "kmalloced" buffers.
188 */
189 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
190 if (!p) {
191 dev_err(&udev->dev, "out of memory\n");
192 r = -ENOMEM;
193 goto error;
194 }
195
196 size &= ~1;
197 while (size > 0) {
198 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
199 size : MAX_TRANSFER_SIZE;
200
201 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
202
203 memcpy(p, data, transfer_size);
204 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
205 USB_REQ_FIRMWARE_DOWNLOAD,
206 USB_DIR_OUT | USB_TYPE_VENDOR,
207 code_offset, 0, p, transfer_size, 1000 /* ms */);
208 if (r < 0) {
209 dev_err(&udev->dev,
210 "USB control request for firmware upload"
211 " failed. Error number %d\n", r);
212 goto error;
213 }
214 transfer_size = r & ~1;
215
216 size -= transfer_size;
217 data += transfer_size;
218 code_offset += transfer_size/sizeof(u16);
219 }
220
221 if (flags & REBOOT) {
222 u8 ret;
223
224 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
225 USB_REQ_FIRMWARE_CONFIRM,
226 USB_DIR_IN | USB_TYPE_VENDOR,
227 0, 0, &ret, sizeof(ret), 5000 /* ms */);
228 if (r != sizeof(ret)) {
229 dev_err(&udev->dev,
230 "control request firmeware confirmation failed."
231 " Return value %d\n", r);
232 if (r >= 0)
233 r = -ENODEV;
234 goto error;
235 }
236 if (ret & 0x80) {
237 dev_err(&udev->dev,
238 "Internal error while downloading."
239 " Firmware confirm return value %#04x\n",
240 (unsigned int)ret);
241 r = -ENODEV;
242 goto error;
243 }
244 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
245 (unsigned int)ret);
246 }
247
248 r = 0;
249error:
250 kfree(p);
251 return r;
252}
253
254static u16 get_word(const void *data, u16 offset)
255{
256 const __le16 *p = data;
257 return le16_to_cpu(p[offset]);
258}
259
260static char *get_fw_name(char *buffer, size_t size, u8 device_type,
261 const char* postfix)
262{
263 scnprintf(buffer, size, "%s%s",
264 device_type == DEVICE_ZD1211B ?
265 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
266 postfix);
267 return buffer;
268}
269
270static int upload_firmware(struct usb_device *udev, u8 device_type)
271{
272 int r;
273 u16 fw_bcdDevice;
274 u16 bcdDevice;
275 const struct firmware *ub_fw = NULL;
276 const struct firmware *uph_fw = NULL;
277 char fw_name[128];
278
279 bcdDevice = get_bcdDevice(udev);
280
281 r = request_fw_file(&ub_fw,
282 get_fw_name(fw_name, sizeof(fw_name), device_type, "ub"),
283 &udev->dev);
284 if (r)
285 goto error;
286
287 fw_bcdDevice = get_word(ub_fw->data, EEPROM_REGS_OFFSET);
288
289 /* FIXME: do we have any reason to perform the kludge that the vendor
290 * driver does when there is a version mismatch? (their driver uploads
291 * different firmwares and stuff)
292 */
293 if (fw_bcdDevice != bcdDevice) {
294 dev_info(&udev->dev,
295 "firmware device id %#06x and actual device id "
296 "%#06x differ, continuing anyway\n",
297 fw_bcdDevice, bcdDevice);
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(fw_name, sizeof(fw_name), device_type, "uphr"),
307 &udev->dev);
308 if (r)
309 goto error;
310
311 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START_OFFSET,
312 REBOOT);
313 if (r) {
314 dev_err(&udev->dev,
315 "Could not upload firmware code uph. Error number %d\n",
316 r);
317 }
318
319 /* FALL-THROUGH */
320error:
321 release_firmware(ub_fw);
322 release_firmware(uph_fw);
323 return r;
324}
325
326static void disable_read_regs_int(struct zd_usb *usb)
327{
328 struct zd_usb_interrupt *intr = &usb->intr;
329
e85d0918
DD		 330 spin_lock(&intr->lock);
331 intr->read_regs_enabled = 0;
332 spin_unlock(&intr->lock);
333}
334
335#define urb_dev(urb) (&(urb)->dev->dev)
336
337static inline void handle_regs_int(struct urb *urb)
338{
339 struct zd_usb *usb = urb->context;
340 struct zd_usb_interrupt *intr = &usb->intr;
341 int len;
342
343 ZD_ASSERT(in_interrupt());
344 spin_lock(&intr->lock);
345
346 if (intr->read_regs_enabled) {
347 intr->read_regs.length = len = urb->actual_length;
348
349 if (len > sizeof(intr->read_regs.buffer))
350 len = sizeof(intr->read_regs.buffer);
351 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
352 intr->read_regs_enabled = 0;
353 complete(&intr->read_regs.completion);
354 goto out;
355 }
356
357 dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
358out:
359 spin_unlock(&intr->lock);
360}
361
362static inline void handle_retry_failed_int(struct urb *urb)
363{
364 dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
365}
366
367
368static void int_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
369{
370 int r;
371 struct usb_int_header *hdr;
372
373 switch (urb->status) {
374 case 0:
375 break;
376 case -ESHUTDOWN:
377 case -EINVAL:
378 case -ENODEV:
379 case -ENOENT:
380 case -ECONNRESET:
e85d0918 381 case -EPIPE:
b312d799 382 goto kfree;
e85d0918
DD		 383 default:
384 goto resubmit;
385 }
386
387 if (urb->actual_length < sizeof(hdr)) {
388 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
389 goto resubmit;
390 }
391
392 hdr = urb->transfer_buffer;
393 if (hdr->type != USB_INT_TYPE) {
394 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
395 goto resubmit;
396 }
397
398 switch (hdr->id) {
399 case USB_INT_ID_REGS:
400 handle_regs_int(urb);
401 break;
402 case USB_INT_ID_RETRY_FAILED:
403 handle_retry_failed_int(urb);
404 break;
405 default:
406 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
407 (unsigned int)hdr->id);
408 goto resubmit;
409 }
410
411resubmit:
412 r = usb_submit_urb(urb, GFP_ATOMIC);
413 if (r) {
414 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
415 goto kfree;
416 }
417 return;
418kfree:
419 kfree(urb->transfer_buffer);
420}
421
422static inline int int_urb_interval(struct usb_device *udev)
423{
424 switch (udev->speed) {
425 case USB_SPEED_HIGH:
426 return 4;
427 case USB_SPEED_LOW:
428 return 10;
429 case USB_SPEED_FULL:
430 default:
431 return 1;
432 }
433}
434
435static inline int usb_int_enabled(struct zd_usb *usb)
436{
437 unsigned long flags;
438 struct zd_usb_interrupt *intr = &usb->intr;
439 struct urb *urb;
440
441 spin_lock_irqsave(&intr->lock, flags);
442 urb = intr->urb;
443 spin_unlock_irqrestore(&intr->lock, flags);
444 return urb != NULL;
445}
446
447int zd_usb_enable_int(struct zd_usb *usb)
448{
449 int r;
450 struct usb_device *udev;
451 struct zd_usb_interrupt *intr = &usb->intr;
452 void *transfer_buffer = NULL;
453 struct urb *urb;
454
455 dev_dbg_f(zd_usb_dev(usb), "\n");
456
457 urb = usb_alloc_urb(0, GFP_NOFS);
458 if (!urb) {
459 r = -ENOMEM;
460 goto out;
461 }
462
463 ZD_ASSERT(!irqs_disabled());
464 spin_lock_irq(&intr->lock);
465 if (intr->urb) {
466 spin_unlock_irq(&intr->lock);
467 r = 0;
468 goto error_free_urb;
469 }
470 intr->urb = urb;
471 spin_unlock_irq(&intr->lock);
472
473 /* TODO: make it a DMA buffer */
474 r = -ENOMEM;
475 transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_NOFS);
476 if (!transfer_buffer) {
477 dev_dbg_f(zd_usb_dev(usb),
478 "couldn't allocate transfer_buffer\n");
479 goto error_set_urb_null;
480 }
481
482 udev = zd_usb_to_usbdev(usb);
483 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
484 transfer_buffer, USB_MAX_EP_INT_BUFFER,
485 int_urb_complete, usb,
486 intr->interval);
487
488 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
489 r = usb_submit_urb(urb, GFP_NOFS);
490 if (r) {
491 dev_dbg_f(zd_usb_dev(usb),
492 "Couldn't submit urb. Error number %d\n", r);
493 goto error;
494 }
495
496 return 0;
497error:
498 kfree(transfer_buffer);
499error_set_urb_null:
500 spin_lock_irq(&intr->lock);
501 intr->urb = NULL;
502 spin_unlock_irq(&intr->lock);
503error_free_urb:
504 usb_free_urb(urb);
505out:
506 return r;
507}
508
509void zd_usb_disable_int(struct zd_usb *usb)
510{
511 unsigned long flags;
512 struct zd_usb_interrupt *intr = &usb->intr;
513 struct urb *urb;
514
515 spin_lock_irqsave(&intr->lock, flags);
516 urb = intr->urb;
517 if (!urb) {
518 spin_unlock_irqrestore(&intr->lock, flags);
519 return;
520 }
521 intr->urb = NULL;
522 spin_unlock_irqrestore(&intr->lock, flags);
523
524 usb_kill_urb(urb);
525 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
526 usb_free_urb(urb);
527}
528
529static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
530 unsigned int length)
531{
532 int i;
533 struct zd_mac *mac = zd_usb_to_mac(usb);
534 const struct rx_length_info *length_info;
535
536 if (length < sizeof(struct rx_length_info)) {
537 /* It's not a complete packet anyhow. */
538 return;
539 }
540 length_info = (struct rx_length_info *)
541 (buffer + length - sizeof(struct rx_length_info));
542
543 /* It might be that three frames are merged into a single URB
544 * transaction. We have to check for the length info tag.
545 *
546 * While testing we discovered that length_info might be unaligned,
547 * because if USB transactions are merged, the last packet will not
548 * be padded. Unaligned access might also happen if the length_info
549 * structure is not present.
550 */
b269825b
UK		 551 if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
552 {
e85d0918
DD		 553 unsigned int l, k, n;
554 for (i = 0, l = 0;; i++) {
b269825b 555 k = le16_to_cpu(get_unaligned(&length_info->length[i]));
e85d0918
DD		 556 n = l+k;
557 if (n > length)
558 return;
559 zd_mac_rx(mac, buffer+l, k);
560 if (i >= 2)
561 return;
562 l = (n+3) & ~3;
563 }
564 } else {
565 zd_mac_rx(mac, buffer, length);
566 }
567}
568
569static void rx_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
570{
571 struct zd_usb *usb;
572 struct zd_usb_rx *rx;
573 const u8 *buffer;
574 unsigned int length;
575
576 switch (urb->status) {
577 case 0:
578 break;
579 case -ESHUTDOWN:
580 case -EINVAL:
581 case -ENODEV:
582 case -ENOENT:
583 case -ECONNRESET:
e85d0918 584 case -EPIPE:
b312d799 585 return;
e85d0918
DD		 586 default:
587 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
588 goto resubmit;
589 }
590
591 buffer = urb->transfer_buffer;
592 length = urb->actual_length;
593 usb = urb->context;
594 rx = &usb->rx;
595
596 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
597 /* If there is an old first fragment, we don't care. */
598 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
599 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
600 spin_lock(&rx->lock);
601 memcpy(rx->fragment, buffer, length);
602 rx->fragment_length = length;
603 spin_unlock(&rx->lock);
604 goto resubmit;
605 }
606
607 spin_lock(&rx->lock);
608 if (rx->fragment_length > 0) {
609 /* We are on a second fragment, we believe */
610 ZD_ASSERT(length + rx->fragment_length <=
611 ARRAY_SIZE(rx->fragment));
612 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
613 memcpy(rx->fragment+rx->fragment_length, buffer, length);
614 handle_rx_packet(usb, rx->fragment,
615 rx->fragment_length + length);
616 rx->fragment_length = 0;
617 spin_unlock(&rx->lock);
618 } else {
619 spin_unlock(&rx->lock);
620 handle_rx_packet(usb, buffer, length);
621 }
622
623resubmit:
624 usb_submit_urb(urb, GFP_ATOMIC);
625}
626
627struct urb *alloc_urb(struct zd_usb *usb)
628{
629 struct usb_device *udev = zd_usb_to_usbdev(usb);
630 struct urb *urb;
631 void *buffer;
632
633 urb = usb_alloc_urb(0, GFP_NOFS);
634 if (!urb)
635 return NULL;
636 buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_NOFS,
637 &urb->transfer_dma);
638 if (!buffer) {
639 usb_free_urb(urb);
640 return NULL;
641 }
642
643 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
644 buffer, USB_MAX_RX_SIZE,
645 rx_urb_complete, usb);
646 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
647
648 return urb;
649}
650
651void free_urb(struct urb *urb)
652{
653 if (!urb)
654 return;
655 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
656 urb->transfer_buffer, urb->transfer_dma);
657 usb_free_urb(urb);
658}
659
660int zd_usb_enable_rx(struct zd_usb *usb)
661{
662 int i, r;
663 struct zd_usb_rx *rx = &usb->rx;
664 struct urb **urbs;
665
666 dev_dbg_f(zd_usb_dev(usb), "\n");
667
668 r = -ENOMEM;
669 urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_NOFS);
670 if (!urbs)
671 goto error;
672 for (i = 0; i < URBS_COUNT; i++) {
673 urbs[i] = alloc_urb(usb);
674 if (!urbs[i])
675 goto error;
676 }
677
678 ZD_ASSERT(!irqs_disabled());
679 spin_lock_irq(&rx->lock);
680 if (rx->urbs) {
681 spin_unlock_irq(&rx->lock);
682 r = 0;
683 goto error;
684 }
685 rx->urbs = urbs;
686 rx->urbs_count = URBS_COUNT;
687 spin_unlock_irq(&rx->lock);
688
689 for (i = 0; i < URBS_COUNT; i++) {
690 r = usb_submit_urb(urbs[i], GFP_NOFS);
691 if (r)
692 goto error_submit;
693 }
694
695 return 0;
696error_submit:
697 for (i = 0; i < URBS_COUNT; i++) {
698 usb_kill_urb(urbs[i]);
699 }
700 spin_lock_irq(&rx->lock);
701 rx->urbs = NULL;
702 rx->urbs_count = 0;
703 spin_unlock_irq(&rx->lock);
704error:
705 if (urbs) {
706 for (i = 0; i < URBS_COUNT; i++)
707 free_urb(urbs[i]);
708 }
709 return r;
710}
711
712void zd_usb_disable_rx(struct zd_usb *usb)
713{
714 int i;
715 unsigned long flags;
716 struct urb **urbs;
717 unsigned int count;
718 struct zd_usb_rx *rx = &usb->rx;
719
720 spin_lock_irqsave(&rx->lock, flags);
721 urbs = rx->urbs;
722 count = rx->urbs_count;
723 spin_unlock_irqrestore(&rx->lock, flags);
724 if (!urbs)
725 return;
726
727 for (i = 0; i < count; i++) {
728 usb_kill_urb(urbs[i]);
729 free_urb(urbs[i]);
730 }
731 kfree(urbs);
732
733 spin_lock_irqsave(&rx->lock, flags);
734 rx->urbs = NULL;
735 rx->urbs_count = 0;
736 spin_unlock_irqrestore(&rx->lock, flags);
737}
738
739static void tx_urb_complete(struct urb *urb, struct pt_regs *pt_regs)
740{
741 int r;
742
743 switch (urb->status) {
744 case 0:
745 break;
746 case -ESHUTDOWN:
747 case -EINVAL:
748 case -ENODEV:
749 case -ENOENT:
750 case -ECONNRESET:
b312d799 751 case -EPIPE:
e85d0918
DD		 752 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
753 break;
e85d0918
DD		 754 default:
755 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
756 goto resubmit;
757 }
758free_urb:
759 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
760 urb->transfer_buffer, urb->transfer_dma);
761 usb_free_urb(urb);
762 return;
763resubmit:
764 r = usb_submit_urb(urb, GFP_ATOMIC);
765 if (r) {
766 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
767 goto free_urb;
768 }
769}
770
771/* Puts the frame on the USB endpoint. It doesn't wait for
772 * completion. The frame must contain the control set.
773 */
774int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
775{
776 int r;
777 struct usb_device *udev = zd_usb_to_usbdev(usb);
778 struct urb *urb;
779 void *buffer;
780
781 urb = usb_alloc_urb(0, GFP_ATOMIC);
782 if (!urb) {
783 r = -ENOMEM;
784 goto out;
785 }
786
787 buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
788 &urb->transfer_dma);
789 if (!buffer) {
790 r = -ENOMEM;
791 goto error_free_urb;
792 }
793 memcpy(buffer, frame, length);
794
795 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
796 buffer, length, tx_urb_complete, NULL);
797 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
798
799 r = usb_submit_urb(urb, GFP_ATOMIC);
800 if (r)
801 goto error;
802 return 0;
803error:
804 usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
805 urb->transfer_dma);
806error_free_urb:
807 usb_free_urb(urb);
808out:
809 return r;
810}
811
812static inline void init_usb_interrupt(struct zd_usb *usb)
813{
814 struct zd_usb_interrupt *intr = &usb->intr;
815
816 spin_lock_init(&intr->lock);
817 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
818 init_completion(&intr->read_regs.completion);
819 intr->read_regs.cr_int_addr = cpu_to_le16(usb_addr(usb, CR_INTERRUPT));
820}
821
822static inline void init_usb_rx(struct zd_usb *usb)
823{
824 struct zd_usb_rx *rx = &usb->rx;
825 spin_lock_init(&rx->lock);
826 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
827 rx->usb_packet_size = 512;
828 } else {
829 rx->usb_packet_size = 64;
830 }
831 ZD_ASSERT(rx->fragment_length == 0);
832}
833
834static inline void init_usb_tx(struct zd_usb *usb)
835{
836 /* FIXME: at this point we will allocate a fixed number of urb's for
837 * use in a cyclic scheme */
838}
839
840void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
841 struct usb_interface *intf)
842{
843 memset(usb, 0, sizeof(*usb));
844 usb->intf = usb_get_intf(intf);
845 usb_set_intfdata(usb->intf, netdev);
846 init_usb_interrupt(usb);
847 init_usb_tx(usb);
848 init_usb_rx(usb);
849}
850
851int zd_usb_init_hw(struct zd_usb *usb)
852{
853 int r;
854 struct zd_chip *chip = zd_usb_to_chip(usb);
855
856 ZD_ASSERT(mutex_is_locked(&chip->mutex));
857 r = zd_ioread16_locked(chip, &usb->fw_base_offset,
858 USB_REG((u16)FW_BASE_ADDR_OFFSET));
859 if (r)
860 return r;
861 dev_dbg_f(zd_usb_dev(usb), "fw_base_offset: %#06hx\n",
862 usb->fw_base_offset);
863
864 return 0;
865}
866
867void zd_usb_clear(struct zd_usb *usb)
868{
869 usb_set_intfdata(usb->intf, NULL);
870 usb_put_intf(usb->intf);
871 memset(usb, 0, sizeof(*usb));
872 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
873}
874
875static const char *speed(enum usb_device_speed speed)
876{
877 switch (speed) {
878 case USB_SPEED_LOW:
879 return "low";
880 case USB_SPEED_FULL:
881 return "full";
882 case USB_SPEED_HIGH:
883 return "high";
884 default:
885 return "unknown speed";
886 }
887}
888
889static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
890{
891 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
892 le16_to_cpu(udev->descriptor.idVendor),
893 le16_to_cpu(udev->descriptor.idProduct),
894 get_bcdDevice(udev),
895 speed(udev->speed));
896}
897
898int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
899{
900 struct usb_device *udev = interface_to_usbdev(usb->intf);
901 return scnprint_id(udev, buffer, size);
902}
903
904#ifdef DEBUG
905static void print_id(struct usb_device *udev)
906{
907 char buffer[40];
908
909 scnprint_id(udev, buffer, sizeof(buffer));
910 buffer[sizeof(buffer)-1] = 0;
911 dev_dbg_f(&udev->dev, "%s\n", buffer);
912}
913#else
914#define print_id(udev) do { } while (0)
915#endif
916
917static int probe(struct usb_interface *intf, const struct usb_device_id *id)
918{
919 int r;
920 struct usb_device *udev = interface_to_usbdev(intf);
921 struct net_device *netdev = NULL;
922
923 print_id(udev);
924
925 switch (udev->speed) {
926 case USB_SPEED_LOW:
927 case USB_SPEED_FULL:
928 case USB_SPEED_HIGH:
929 break;
930 default:
931 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
932 r = -ENODEV;
933 goto error;
934 }
935
936 netdev = zd_netdev_alloc(intf);
937 if (netdev == NULL) {
938 r = -ENOMEM;
939 goto error;
940 }
941
942 r = upload_firmware(udev, id->driver_info);
943 if (r) {
944 dev_err(&intf->dev,
945 "couldn't load firmware. Error number %d\n", r);
946 goto error;
947 }
948
949 r = usb_reset_configuration(udev);
950 if (r) {
951 dev_dbg_f(&intf->dev,
952 "couldn't reset configuration. Error number %d\n", r);
953 goto error;
954 }
955
956 /* At this point the interrupt endpoint is not generally enabled. We
957 * save the USB bandwidth until the network device is opened. But
958 * notify that the initialization of the MAC will require the
959 * interrupts to be temporary enabled.
960 */
961 r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
962 if (r) {
963 dev_dbg_f(&intf->dev,
964 "couldn't initialize mac. Error number %d\n", r);
965 goto error;
966 }
967
968 r = register_netdev(netdev);
969 if (r) {
970 dev_dbg_f(&intf->dev,
971 "couldn't register netdev. Error number %d\n", r);
972 goto error;
973 }
974
975 dev_dbg_f(&intf->dev, "successful\n");
976 dev_info(&intf->dev,"%s\n", netdev->name);
977 return 0;
978error:
979 usb_reset_device(interface_to_usbdev(intf));
980 zd_netdev_free(netdev);
981 return r;
982}
983
984static void disconnect(struct usb_interface *intf)
985{
986 struct net_device *netdev = zd_intf_to_netdev(intf);
987 struct zd_mac *mac = zd_netdev_mac(netdev);
988 struct zd_usb *usb = &mac->chip.usb;
989
990 dev_dbg_f(zd_usb_dev(usb), "\n");
991
992 zd_netdev_disconnect(netdev);
993
994 /* Just in case something has gone wrong! */
995 zd_usb_disable_rx(usb);
996 zd_usb_disable_int(usb);
997
998 /* If the disconnect has been caused by a removal of the
999 * driver module, the reset allows reloading of the driver. If the
1000 * reset will not be executed here, the upload of the firmware in the
1001 * probe function caused by the reloading of the driver will fail.
1002 */
1003 usb_reset_device(interface_to_usbdev(intf));
1004
1005 /* If somebody still waits on this lock now, this is an error. */
1006 zd_netdev_free(netdev);
1007 dev_dbg(&intf->dev, "disconnected\n");
1008}
1009
1010static struct usb_driver driver = {
1011 .name = "zd1211rw",
1012 .id_table = usb_ids,
1013 .probe = probe,
1014 .disconnect = disconnect,
1015};
1016
1017static int __init usb_init(void)
1018{
1019 int r;
1020
1021 pr_debug("usb_init()\n");
1022
1023 r = usb_register(&driver);
1024 if (r) {
1025 printk(KERN_ERR "usb_register() failed. Error number %d\n", r);
1026 return r;
1027 }
1028
1029 pr_debug("zd1211rw initialized\n");
1030 return 0;
1031}
1032
1033static void __exit usb_exit(void)
1034{
1035 pr_debug("usb_exit()\n");
1036 usb_deregister(&driver);
1037}
1038
1039module_init(usb_init);
1040module_exit(usb_exit);
1041
1042static int usb_int_regs_length(unsigned int count)
1043{
1044 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1045}
1046
1047static void prepare_read_regs_int(struct zd_usb *usb)
1048{
1049 struct zd_usb_interrupt *intr = &usb->intr;
1050
1051 spin_lock(&intr->lock);
1052 intr->read_regs_enabled = 1;
1053 INIT_COMPLETION(intr->read_regs.completion);
1054 spin_unlock(&intr->lock);
1055}
1056
1057static int get_results(struct zd_usb *usb, u16 *values,
1058 struct usb_req_read_regs *req, unsigned int count)
1059{
1060 int r;
1061 int i;
1062 struct zd_usb_interrupt *intr = &usb->intr;
1063 struct read_regs_int *rr = &intr->read_regs;
1064 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1065
1066 spin_lock(&intr->lock);
1067
1068 r = -EIO;
1069 /* The created block size seems to be larger than expected.
1070 * However results appear to be correct.
1071 */
1072 if (rr->length < usb_int_regs_length(count)) {
1073 dev_dbg_f(zd_usb_dev(usb),
1074 "error: actual length %d less than expected %d\n",
1075 rr->length, usb_int_regs_length(count));
1076 goto error_unlock;
1077 }
1078 if (rr->length > sizeof(rr->buffer)) {
1079 dev_dbg_f(zd_usb_dev(usb),
1080 "error: actual length %d exceeds buffer size %zu\n",
1081 rr->length, sizeof(rr->buffer));
1082 goto error_unlock;
1083 }
1084
1085 for (i = 0; i < count; i++) {
1086 struct reg_data *rd = &regs->regs[i];
1087 if (rd->addr != req->addr[i]) {
1088 dev_dbg_f(zd_usb_dev(usb),
1089 "rd[%d] addr %#06hx expected %#06hx\n", i,
1090 le16_to_cpu(rd->addr),
1091 le16_to_cpu(req->addr[i]));
1092 goto error_unlock;
1093 }
1094 values[i] = le16_to_cpu(rd->value);
1095 }
1096
1097 r = 0;
1098error_unlock:
1099 spin_unlock(&intr->lock);
1100 return r;
1101}
1102
1103int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1104 const zd_addr_t *addresses, unsigned int count)
1105{
1106 int r;
1107 int i, req_len, actual_req_len;
1108 struct usb_device *udev;
1109 struct usb_req_read_regs *req = NULL;
1110 unsigned long timeout;
1111
1112 if (count < 1) {
1113 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1114 return -EINVAL;
1115 }
1116 if (count > USB_MAX_IOREAD16_COUNT) {
1117 dev_dbg_f(zd_usb_dev(usb),
1118 "error: count %u exceeds possible max %u\n",
1119 count, USB_MAX_IOREAD16_COUNT);
1120 return -EINVAL;
1121 }
1122 if (in_atomic()) {
1123 dev_dbg_f(zd_usb_dev(usb),
1124 "error: io in atomic context not supported\n");
1125 return -EWOULDBLOCK;
1126 }
1127 if (!usb_int_enabled(usb)) {
1128 dev_dbg_f(zd_usb_dev(usb),
1129 "error: usb interrupt not enabled\n");
1130 return -EWOULDBLOCK;
1131 }
1132
1133 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1134 req = kmalloc(req_len, GFP_NOFS);
1135 if (!req)
1136 return -ENOMEM;
1137 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1138 for (i = 0; i < count; i++)
1139 req->addr[i] = cpu_to_le16(usb_addr(usb, addresses[i]));
1140
1141 udev = zd_usb_to_usbdev(usb);
1142 prepare_read_regs_int(usb);
1143 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1144 req, req_len, &actual_req_len, 1000 /* ms */);
1145 if (r) {
1146 dev_dbg_f(zd_usb_dev(usb),
1147 "error in usb_bulk_msg(). Error number %d\n", r);
1148 goto error;
1149 }
1150 if (req_len != actual_req_len) {
1151 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1152 " req_len %d != actual_req_len %d\n",
1153 req_len, actual_req_len);
1154 r = -EIO;
1155 goto error;
1156 }
1157
1158 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1159 msecs_to_jiffies(1000));
1160 if (!timeout) {
1161 disable_read_regs_int(usb);
1162 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1163 r = -ETIMEDOUT;
1164 goto error;
1165 }
1166
1167 r = get_results(usb, values, req, count);
1168error:
1169 kfree(req);
1170 return r;
1171}
1172
1173int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1174 unsigned int count)
1175{
1176 int r;
1177 struct usb_device *udev;
1178 struct usb_req_write_regs *req = NULL;
1179 int i, req_len, actual_req_len;
1180
1181 if (count == 0)
1182 return 0;
1183 if (count > USB_MAX_IOWRITE16_COUNT) {
1184 dev_dbg_f(zd_usb_dev(usb),
1185 "error: count %u exceeds possible max %u\n",
1186 count, USB_MAX_IOWRITE16_COUNT);
1187 return -EINVAL;
1188 }
1189 if (in_atomic()) {
1190 dev_dbg_f(zd_usb_dev(usb),
1191 "error: io in atomic context not supported\n");
1192 return -EWOULDBLOCK;
1193 }
1194
1195 req_len = sizeof(struct usb_req_write_regs) +
1196 count * sizeof(struct reg_data);
1197 req = kmalloc(req_len, GFP_NOFS);
1198 if (!req)
1199 return -ENOMEM;
1200
1201 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1202 for (i = 0; i < count; i++) {
1203 struct reg_data *rw = &req->reg_writes[i];
1204 rw->addr = cpu_to_le16(usb_addr(usb, ioreqs[i].addr));
1205 rw->value = cpu_to_le16(ioreqs[i].value);
1206 }
1207
1208 udev = zd_usb_to_usbdev(usb);
1209 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1210 req, req_len, &actual_req_len, 1000 /* ms */);
1211 if (r) {
1212 dev_dbg_f(zd_usb_dev(usb),
1213 "error in usb_bulk_msg(). Error number %d\n", r);
1214 goto error;
1215 }
1216 if (req_len != actual_req_len) {
1217 dev_dbg_f(zd_usb_dev(usb),
1218 "error in usb_bulk_msg()"
1219 " req_len %d != actual_req_len %d\n",
1220 req_len, actual_req_len);
1221 r = -EIO;
1222 goto error;
1223 }
1224
1225 /* FALL-THROUGH with r == 0 */
1226error:
1227 kfree(req);
1228 return r;
1229}
1230
1231int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1232{
1233 int r;
1234 struct usb_device *udev;
1235 struct usb_req_rfwrite *req = NULL;
1236 int i, req_len, actual_req_len;
1237 u16 bit_value_template;
1238
1239 if (in_atomic()) {
1240 dev_dbg_f(zd_usb_dev(usb),
1241 "error: io in atomic context not supported\n");
1242 return -EWOULDBLOCK;
1243 }
1244 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1245 dev_dbg_f(zd_usb_dev(usb),
1246 "error: bits %d are smaller than"
1247 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1248 bits, USB_MIN_RFWRITE_BIT_COUNT);
1249 return -EINVAL;
1250 }
1251 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1252 dev_dbg_f(zd_usb_dev(usb),
1253 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1254 bits, USB_MAX_RFWRITE_BIT_COUNT);
1255 return -EINVAL;
1256 }
1257#ifdef DEBUG
1258 if (value & (~0UL << bits)) {
1259 dev_dbg_f(zd_usb_dev(usb),
1260 "error: value %#09x has bits >= %d set\n",
1261 value, bits);
1262 return -EINVAL;
1263 }
1264#endif /* DEBUG */
1265
1266 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1267
1268 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1269 if (r) {
1270 dev_dbg_f(zd_usb_dev(usb),
1271 "error %d: Couldn't read CR203\n", r);
1272 goto out;
1273 }
1274 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1275
1276 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1277 req = kmalloc(req_len, GFP_NOFS);
1278 if (!req)
1279 return -ENOMEM;
1280
1281 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1282 /* 1: 3683a, but not used in ZYDAS driver */
1283 req->value = cpu_to_le16(2);
1284 req->bits = cpu_to_le16(bits);
1285
1286 for (i = 0; i < bits; i++) {
1287 u16 bv = bit_value_template;
1288 if (value & (1 << (bits-1-i)))
1289 bv |= RF_DATA;
1290 req->bit_values[i] = cpu_to_le16(bv);
1291 }
1292
1293 udev = zd_usb_to_usbdev(usb);
1294 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1295 req, req_len, &actual_req_len, 1000 /* ms */);
1296 if (r) {
1297 dev_dbg_f(zd_usb_dev(usb),
1298 "error in usb_bulk_msg(). Error number %d\n", r);
1299 goto out;
1300 }
1301 if (req_len != actual_req_len) {
1302 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1303 " req_len %d != actual_req_len %d\n",
1304 req_len, actual_req_len);
1305 r = -EIO;
1306 goto out;
1307 }
1308
1309 /* FALL-THROUGH with r == 0 */
1310out:
1311 kfree(req);
1312 return r;
1313}
Linux kernel - Deliverables
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