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zd1211rw: too early inclusion of asm/unaligned.h
[pv_ops_mirror.git] / drivers / net / wireless / zd1211rw / zd_usb.c
blobca24299a26c6eab3c1aede78654124b5418b1acd
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 <linux/kernel.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 <linux/workqueue.h>
27 #include <net/ieee80211.h>
28 #include <asm/unaligned.h>
29
30 #include "zd_def.h"
31 #include "zd_netdev.h"
32 #include "zd_mac.h"
33 #include "zd_usb.h"
34 #include "zd_util.h"
35
36 static struct usb_device_id usb_ids[] = {
37 /* ZD1211 */
38 { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
39 { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
40 { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
41 { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
42 { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
43 { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
44 { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
45 { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
46 { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
47 { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
48 { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
49 { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
50 { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
51 { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
52 { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
53 { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
54 { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
55 { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
56 { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
57 { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
58 /* ZD1211B */
59 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
60 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
61 { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
62 { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
63 { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
64 { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
65 { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
66 { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
67 { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
68 { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
69 { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
70 { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
71 { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
72 { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
73 { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
74 /* "Driverless" devices that need ejecting */
75 { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
76 { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
77 {}
78 };
79
80 MODULE_LICENSE("GPL");
81 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
82 MODULE_AUTHOR("Ulrich Kunitz");
83 MODULE_AUTHOR("Daniel Drake");
84 MODULE_VERSION("1.0");
85 MODULE_DEVICE_TABLE(usb, usb_ids);
86
87 #define FW_ZD1211_PREFIX "zd1211/zd1211_"
88 #define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
89
90 /* USB device initialization */
91
92 static int request_fw_file(
93 const struct firmware **fw, const char *name, struct device *device)
94 {
95 int r;
96
97 dev_dbg_f(device, "fw name %s\n", name);
98
99 r = request_firmware(fw, name, device);
100 if (r)
101 dev_err(device,
102 "Could not load firmware file %s. Error number %d\n",
103 name, r);
104 return r;
105 }
106
107 static inline u16 get_bcdDevice(const struct usb_device *udev)
108 {
109 return le16_to_cpu(udev->descriptor.bcdDevice);
110 }
111
112 enum upload_code_flags {
113 REBOOT = 1,
114 };
115
116 /* Ensures that MAX_TRANSFER_SIZE is even. */
117 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
118
119 static int upload_code(struct usb_device *udev,
120 const u8 *data, size_t size, u16 code_offset, int flags)
121 {
122 u8 *p;
123 int r;
124
125 /* USB request blocks need "kmalloced" buffers.
126 */
127 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
128 if (!p) {
129 dev_err(&udev->dev, "out of memory\n");
130 r = -ENOMEM;
131 goto error;
132 }
133
134 size &= ~1;
135 while (size > 0) {
136 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
137 size : MAX_TRANSFER_SIZE;
138
139 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
140
141 memcpy(p, data, transfer_size);
142 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
143 USB_REQ_FIRMWARE_DOWNLOAD,
144 USB_DIR_OUT | USB_TYPE_VENDOR,
145 code_offset, 0, p, transfer_size, 1000 /* ms */);
146 if (r < 0) {
147 dev_err(&udev->dev,
148 "USB control request for firmware upload"
149 " failed. Error number %d\n", r);
150 goto error;
151 }
152 transfer_size = r & ~1;
153
154 size -= transfer_size;
155 data += transfer_size;
156 code_offset += transfer_size/sizeof(u16);
157 }
158
159 if (flags & REBOOT) {
160 u8 ret;
161
162 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
163 USB_REQ_FIRMWARE_CONFIRM,
164 USB_DIR_IN | USB_TYPE_VENDOR,
165 0, 0, &ret, sizeof(ret), 5000 /* ms */);
166 if (r != sizeof(ret)) {
167 dev_err(&udev->dev,
168 "control request firmeware confirmation failed."
169 " Return value %d\n", r);
170 if (r >= 0)
171 r = -ENODEV;
172 goto error;
173 }
174 if (ret & 0x80) {
175 dev_err(&udev->dev,
176 "Internal error while downloading."
177 " Firmware confirm return value %#04x\n",
178 (unsigned int)ret);
179 r = -ENODEV;
180 goto error;
181 }
182 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
183 (unsigned int)ret);
184 }
185
186 r = 0;
187 error:
188 kfree(p);
189 return r;
190 }
191
192 static u16 get_word(const void *data, u16 offset)
193 {
194 const __le16 *p = data;
195 return le16_to_cpu(p[offset]);
196 }
197
198 static char *get_fw_name(char *buffer, size_t size, u8 device_type,
199 const char* postfix)
200 {
201 scnprintf(buffer, size, "%s%s",
202 device_type == DEVICE_ZD1211B ?
203 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
204 postfix);
205 return buffer;
206 }
207
208 static int handle_version_mismatch(struct usb_device *udev, u8 device_type,
209 const struct firmware *ub_fw)
210 {
211 const struct firmware *ur_fw = NULL;
212 int offset;
213 int r = 0;
214 char fw_name[128];
215
216 r = request_fw_file(&ur_fw,
217 get_fw_name(fw_name, sizeof(fw_name), device_type, "ur"),
218 &udev->dev);
219 if (r)
220 goto error;
221
222 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
223 if (r)
224 goto error;
225
226 offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
227 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
228 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
229
230 /* At this point, the vendor driver downloads the whole firmware
231 * image, hacks around with version IDs, and uploads it again,
232 * completely overwriting the boot code. We do not do this here as
233 * it is not required on any tested devices, and it is suspected to
234 * cause problems. */
235 error:
236 release_firmware(ur_fw);
237 return r;
238 }
239
240 static int upload_firmware(struct usb_device *udev, u8 device_type)
241 {
242 int r;
243 u16 fw_bcdDevice;
244 u16 bcdDevice;
245 const struct firmware *ub_fw = NULL;
246 const struct firmware *uph_fw = NULL;
247 char fw_name[128];
248
249 bcdDevice = get_bcdDevice(udev);
250
251 r = request_fw_file(&ub_fw,
252 get_fw_name(fw_name, sizeof(fw_name), device_type, "ub"),
253 &udev->dev);
254 if (r)
255 goto error;
256
257 fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
258
259 if (fw_bcdDevice != bcdDevice) {
260 dev_info(&udev->dev,
261 "firmware version %#06x and device bootcode version "
262 "%#06x differ\n", fw_bcdDevice, bcdDevice);
263 if (bcdDevice <= 0x4313)
264 dev_warn(&udev->dev, "device has old bootcode, please "
265 "report success or failure\n");
266
267 r = handle_version_mismatch(udev, device_type, ub_fw);
268 if (r)
269 goto error;
270 } else {
271 dev_dbg_f(&udev->dev,
272 "firmware device id %#06x is equal to the "
273 "actual device id\n", fw_bcdDevice);
274 }
275
276
277 r = request_fw_file(&uph_fw,
278 get_fw_name(fw_name, sizeof(fw_name), device_type, "uphr"),
279 &udev->dev);
280 if (r)
281 goto error;
282
283 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
284 if (r) {
285 dev_err(&udev->dev,
286 "Could not upload firmware code uph. Error number %d\n",
287 r);
288 }
289
290 /* FALL-THROUGH */
291 error:
292 release_firmware(ub_fw);
293 release_firmware(uph_fw);
294 return r;
295 }
296
297 #define urb_dev(urb) (&(urb)->dev->dev)
298
299 static inline void handle_regs_int(struct urb *urb)
300 {
301 struct zd_usb *usb = urb->context;
302 struct zd_usb_interrupt *intr = &usb->intr;
303 int len;
304
305 ZD_ASSERT(in_interrupt());
306 spin_lock(&intr->lock);
307
308 if (intr->read_regs_enabled) {
309 intr->read_regs.length = len = urb->actual_length;
310
311 if (len > sizeof(intr->read_regs.buffer))
312 len = sizeof(intr->read_regs.buffer);
313 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
314 intr->read_regs_enabled = 0;
315 complete(&intr->read_regs.completion);
316 goto out;
317 }
318
319 dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
320 out:
321 spin_unlock(&intr->lock);
322 }
323
324 static inline void handle_retry_failed_int(struct urb *urb)
325 {
326 struct zd_usb *usb = urb->context;
327 struct zd_mac *mac = zd_usb_to_mac(usb);
328 struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
329
330 ieee->stats.tx_errors++;
331 ieee->ieee_stats.tx_retry_limit_exceeded++;
332 dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
333 }
334
335
336 static void int_urb_complete(struct urb *urb)
337 {
338 int r;
339 struct usb_int_header *hdr;
340
341 switch (urb->status) {
342 case 0:
343 break;
344 case -ESHUTDOWN:
345 case -EINVAL:
346 case -ENODEV:
347 case -ENOENT:
348 case -ECONNRESET:
349 case -EPIPE:
350 goto kfree;
351 default:
352 goto resubmit;
353 }
354
355 if (urb->actual_length < sizeof(hdr)) {
356 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
357 goto resubmit;
358 }
359
360 hdr = urb->transfer_buffer;
361 if (hdr->type != USB_INT_TYPE) {
362 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
363 goto resubmit;
364 }
365
366 switch (hdr->id) {
367 case USB_INT_ID_REGS:
368 handle_regs_int(urb);
369 break;
370 case USB_INT_ID_RETRY_FAILED:
371 handle_retry_failed_int(urb);
372 break;
373 default:
374 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
375 (unsigned int)hdr->id);
376 goto resubmit;
377 }
378
379 resubmit:
380 r = usb_submit_urb(urb, GFP_ATOMIC);
381 if (r) {
382 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
383 goto kfree;
384 }
385 return;
386 kfree:
387 kfree(urb->transfer_buffer);
388 }
389
390 static inline int int_urb_interval(struct usb_device *udev)
391 {
392 switch (udev->speed) {
393 case USB_SPEED_HIGH:
394 return 4;
395 case USB_SPEED_LOW:
396 return 10;
397 case USB_SPEED_FULL:
398 default:
399 return 1;
400 }
401 }
402
403 static inline int usb_int_enabled(struct zd_usb *usb)
404 {
405 unsigned long flags;
406 struct zd_usb_interrupt *intr = &usb->intr;
407 struct urb *urb;
408
409 spin_lock_irqsave(&intr->lock, flags);
410 urb = intr->urb;
411 spin_unlock_irqrestore(&intr->lock, flags);
412 return urb != NULL;
413 }
414
415 int zd_usb_enable_int(struct zd_usb *usb)
416 {
417 int r;
418 struct usb_device *udev;
419 struct zd_usb_interrupt *intr = &usb->intr;
420 void *transfer_buffer = NULL;
421 struct urb *urb;
422
423 dev_dbg_f(zd_usb_dev(usb), "\n");
424
425 urb = usb_alloc_urb(0, GFP_KERNEL);
426 if (!urb) {
427 r = -ENOMEM;
428 goto out;
429 }
430
431 ZD_ASSERT(!irqs_disabled());
432 spin_lock_irq(&intr->lock);
433 if (intr->urb) {
434 spin_unlock_irq(&intr->lock);
435 r = 0;
436 goto error_free_urb;
437 }
438 intr->urb = urb;
439 spin_unlock_irq(&intr->lock);
440
441 /* TODO: make it a DMA buffer */
442 r = -ENOMEM;
443 transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
444 if (!transfer_buffer) {
445 dev_dbg_f(zd_usb_dev(usb),
446 "couldn't allocate transfer_buffer\n");
447 goto error_set_urb_null;
448 }
449
450 udev = zd_usb_to_usbdev(usb);
451 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
452 transfer_buffer, USB_MAX_EP_INT_BUFFER,
453 int_urb_complete, usb,
454 intr->interval);
455
456 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
457 r = usb_submit_urb(urb, GFP_KERNEL);
458 if (r) {
459 dev_dbg_f(zd_usb_dev(usb),
460 "Couldn't submit urb. Error number %d\n", r);
461 goto error;
462 }
463
464 return 0;
465 error:
466 kfree(transfer_buffer);
467 error_set_urb_null:
468 spin_lock_irq(&intr->lock);
469 intr->urb = NULL;
470 spin_unlock_irq(&intr->lock);
471 error_free_urb:
472 usb_free_urb(urb);
473 out:
474 return r;
475 }
476
477 void zd_usb_disable_int(struct zd_usb *usb)
478 {
479 unsigned long flags;
480 struct zd_usb_interrupt *intr = &usb->intr;
481 struct urb *urb;
482
483 spin_lock_irqsave(&intr->lock, flags);
484 urb = intr->urb;
485 if (!urb) {
486 spin_unlock_irqrestore(&intr->lock, flags);
487 return;
488 }
489 intr->urb = NULL;
490 spin_unlock_irqrestore(&intr->lock, flags);
491
492 usb_kill_urb(urb);
493 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
494 usb_free_urb(urb);
495 }
496
497 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
498 unsigned int length)
499 {
500 int i;
501 struct zd_mac *mac = zd_usb_to_mac(usb);
502 const struct rx_length_info *length_info;
503
504 if (length < sizeof(struct rx_length_info)) {
505 /* It's not a complete packet anyhow. */
506 struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
507 ieee->stats.rx_errors++;
508 ieee->stats.rx_length_errors++;
509 return;
510 }
511 length_info = (struct rx_length_info *)
512 (buffer + length - sizeof(struct rx_length_info));
513
514 /* It might be that three frames are merged into a single URB
515 * transaction. We have to check for the length info tag.
516 *
517 * While testing we discovered that length_info might be unaligned,
518 * because if USB transactions are merged, the last packet will not
519 * be padded. Unaligned access might also happen if the length_info
520 * structure is not present.
521 */
522 if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
523 {
524 unsigned int l, k, n;
525 for (i = 0, l = 0;; i++) {
526 k = le16_to_cpu(get_unaligned(&length_info->length[i]));
527 if (k == 0)
528 return;
529 n = l+k;
530 if (n > length)
531 return;
532 zd_mac_rx_irq(mac, buffer+l, k);
533 if (i >= 2)
534 return;
535 l = (n+3) & ~3;
536 }
537 } else {
538 zd_mac_rx_irq(mac, buffer, length);
539 }
540 }
541
542 static void rx_urb_complete(struct urb *urb)
543 {
544 struct zd_usb *usb;
545 struct zd_usb_rx *rx;
546 const u8 *buffer;
547 unsigned int length;
548
549 switch (urb->status) {
550 case 0:
551 break;
552 case -ESHUTDOWN:
553 case -EINVAL:
554 case -ENODEV:
555 case -ENOENT:
556 case -ECONNRESET:
557 case -EPIPE:
558 return;
559 default:
560 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
561 goto resubmit;
562 }
563
564 buffer = urb->transfer_buffer;
565 length = urb->actual_length;
566 usb = urb->context;
567 rx = &usb->rx;
568
569 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
570 /* If there is an old first fragment, we don't care. */
571 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
572 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
573 spin_lock(&rx->lock);
574 memcpy(rx->fragment, buffer, length);
575 rx->fragment_length = length;
576 spin_unlock(&rx->lock);
577 goto resubmit;
578 }
579
580 spin_lock(&rx->lock);
581 if (rx->fragment_length > 0) {
582 /* We are on a second fragment, we believe */
583 ZD_ASSERT(length + rx->fragment_length <=
584 ARRAY_SIZE(rx->fragment));
585 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
586 memcpy(rx->fragment+rx->fragment_length, buffer, length);
587 handle_rx_packet(usb, rx->fragment,
588 rx->fragment_length + length);
589 rx->fragment_length = 0;
590 spin_unlock(&rx->lock);
591 } else {
592 spin_unlock(&rx->lock);
593 handle_rx_packet(usb, buffer, length);
594 }
595
596 resubmit:
597 usb_submit_urb(urb, GFP_ATOMIC);
598 }
599
600 static struct urb *alloc_urb(struct zd_usb *usb)
601 {
602 struct usb_device *udev = zd_usb_to_usbdev(usb);
603 struct urb *urb;
604 void *buffer;
605
606 urb = usb_alloc_urb(0, GFP_KERNEL);
607 if (!urb)
608 return NULL;
609 buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
610 &urb->transfer_dma);
611 if (!buffer) {
612 usb_free_urb(urb);
613 return NULL;
614 }
615
616 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
617 buffer, USB_MAX_RX_SIZE,
618 rx_urb_complete, usb);
619 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
620
621 return urb;
622 }
623
624 static void free_urb(struct urb *urb)
625 {
626 if (!urb)
627 return;
628 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
629 urb->transfer_buffer, urb->transfer_dma);
630 usb_free_urb(urb);
631 }
632
633 int zd_usb_enable_rx(struct zd_usb *usb)
634 {
635 int i, r;
636 struct zd_usb_rx *rx = &usb->rx;
637 struct urb **urbs;
638
639 dev_dbg_f(zd_usb_dev(usb), "\n");
640
641 r = -ENOMEM;
642 urbs = kcalloc(URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
643 if (!urbs)
644 goto error;
645 for (i = 0; i < URBS_COUNT; i++) {
646 urbs[i] = alloc_urb(usb);
647 if (!urbs[i])
648 goto error;
649 }
650
651 ZD_ASSERT(!irqs_disabled());
652 spin_lock_irq(&rx->lock);
653 if (rx->urbs) {
654 spin_unlock_irq(&rx->lock);
655 r = 0;
656 goto error;
657 }
658 rx->urbs = urbs;
659 rx->urbs_count = URBS_COUNT;
660 spin_unlock_irq(&rx->lock);
661
662 for (i = 0; i < URBS_COUNT; i++) {
663 r = usb_submit_urb(urbs[i], GFP_KERNEL);
664 if (r)
665 goto error_submit;
666 }
667
668 return 0;
669 error_submit:
670 for (i = 0; i < URBS_COUNT; i++) {
671 usb_kill_urb(urbs[i]);
672 }
673 spin_lock_irq(&rx->lock);
674 rx->urbs = NULL;
675 rx->urbs_count = 0;
676 spin_unlock_irq(&rx->lock);
677 error:
678 if (urbs) {
679 for (i = 0; i < URBS_COUNT; i++)
680 free_urb(urbs[i]);
681 }
682 return r;
683 }
684
685 void zd_usb_disable_rx(struct zd_usb *usb)
686 {
687 int i;
688 unsigned long flags;
689 struct urb **urbs;
690 unsigned int count;
691 struct zd_usb_rx *rx = &usb->rx;
692
693 spin_lock_irqsave(&rx->lock, flags);
694 urbs = rx->urbs;
695 count = rx->urbs_count;
696 spin_unlock_irqrestore(&rx->lock, flags);
697 if (!urbs)
698 return;
699
700 for (i = 0; i < count; i++) {
701 usb_kill_urb(urbs[i]);
702 free_urb(urbs[i]);
703 }
704 kfree(urbs);
705
706 spin_lock_irqsave(&rx->lock, flags);
707 rx->urbs = NULL;
708 rx->urbs_count = 0;
709 spin_unlock_irqrestore(&rx->lock, flags);
710 }
711
712 static void tx_urb_complete(struct urb *urb)
713 {
714 int r;
715
716 switch (urb->status) {
717 case 0:
718 break;
719 case -ESHUTDOWN:
720 case -EINVAL:
721 case -ENODEV:
722 case -ENOENT:
723 case -ECONNRESET:
724 case -EPIPE:
725 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
726 break;
727 default:
728 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
729 goto resubmit;
730 }
731 free_urb:
732 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
733 urb->transfer_buffer, urb->transfer_dma);
734 usb_free_urb(urb);
735 return;
736 resubmit:
737 r = usb_submit_urb(urb, GFP_ATOMIC);
738 if (r) {
739 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
740 goto free_urb;
741 }
742 }
743
744 /* Puts the frame on the USB endpoint. It doesn't wait for
745 * completion. The frame must contain the control set.
746 */
747 int zd_usb_tx(struct zd_usb *usb, const u8 *frame, unsigned int length)
748 {
749 int r;
750 struct usb_device *udev = zd_usb_to_usbdev(usb);
751 struct urb *urb;
752 void *buffer;
753
754 urb = usb_alloc_urb(0, GFP_ATOMIC);
755 if (!urb) {
756 r = -ENOMEM;
757 goto out;
758 }
759
760 buffer = usb_buffer_alloc(zd_usb_to_usbdev(usb), length, GFP_ATOMIC,
761 &urb->transfer_dma);
762 if (!buffer) {
763 r = -ENOMEM;
764 goto error_free_urb;
765 }
766 memcpy(buffer, frame, length);
767
768 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
769 buffer, length, tx_urb_complete, NULL);
770 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
771
772 r = usb_submit_urb(urb, GFP_ATOMIC);
773 if (r)
774 goto error;
775 return 0;
776 error:
777 usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
778 urb->transfer_dma);
779 error_free_urb:
780 usb_free_urb(urb);
781 out:
782 return r;
783 }
784
785 static inline void init_usb_interrupt(struct zd_usb *usb)
786 {
787 struct zd_usb_interrupt *intr = &usb->intr;
788
789 spin_lock_init(&intr->lock);
790 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
791 init_completion(&intr->read_regs.completion);
792 intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
793 }
794
795 static inline void init_usb_rx(struct zd_usb *usb)
796 {
797 struct zd_usb_rx *rx = &usb->rx;
798 spin_lock_init(&rx->lock);
799 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
800 rx->usb_packet_size = 512;
801 } else {
802 rx->usb_packet_size = 64;
803 }
804 ZD_ASSERT(rx->fragment_length == 0);
805 }
806
807 static inline void init_usb_tx(struct zd_usb *usb)
808 {
809 /* FIXME: at this point we will allocate a fixed number of urb's for
810 * use in a cyclic scheme */
811 }
812
813 void zd_usb_init(struct zd_usb *usb, struct net_device *netdev,
814 struct usb_interface *intf)
815 {
816 memset(usb, 0, sizeof(*usb));
817 usb->intf = usb_get_intf(intf);
818 usb_set_intfdata(usb->intf, netdev);
819 init_usb_interrupt(usb);
820 init_usb_tx(usb);
821 init_usb_rx(usb);
822 }
823
824 void zd_usb_clear(struct zd_usb *usb)
825 {
826 usb_set_intfdata(usb->intf, NULL);
827 usb_put_intf(usb->intf);
828 ZD_MEMCLEAR(usb, sizeof(*usb));
829 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
830 }
831
832 static const char *speed(enum usb_device_speed speed)
833 {
834 switch (speed) {
835 case USB_SPEED_LOW:
836 return "low";
837 case USB_SPEED_FULL:
838 return "full";
839 case USB_SPEED_HIGH:
840 return "high";
841 default:
842 return "unknown speed";
843 }
844 }
845
846 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
847 {
848 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
849 le16_to_cpu(udev->descriptor.idVendor),
850 le16_to_cpu(udev->descriptor.idProduct),
851 get_bcdDevice(udev),
852 speed(udev->speed));
853 }
854
855 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
856 {
857 struct usb_device *udev = interface_to_usbdev(usb->intf);
858 return scnprint_id(udev, buffer, size);
859 }
860
861 #ifdef DEBUG
862 static void print_id(struct usb_device *udev)
863 {
864 char buffer[40];
865
866 scnprint_id(udev, buffer, sizeof(buffer));
867 buffer[sizeof(buffer)-1] = 0;
868 dev_dbg_f(&udev->dev, "%s\n", buffer);
869 }
870 #else
871 #define print_id(udev) do { } while (0)
872 #endif
873
874 static int eject_installer(struct usb_interface *intf)
875 {
876 struct usb_device *udev = interface_to_usbdev(intf);
877 struct usb_host_interface *iface_desc = &intf->altsetting[0];
878 struct usb_endpoint_descriptor *endpoint;
879 unsigned char *cmd;
880 u8 bulk_out_ep;
881 int r;
882
883 /* Find bulk out endpoint */
884 endpoint = &iface_desc->endpoint[1].desc;
885 if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
886 (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
887 USB_ENDPOINT_XFER_BULK) {
888 bulk_out_ep = endpoint->bEndpointAddress;
889 } else {
890 dev_err(&udev->dev,
891 "zd1211rw: Could not find bulk out endpoint\n");
892 return -ENODEV;
893 }
894
895 cmd = kzalloc(31, GFP_KERNEL);
896 if (cmd == NULL)
897 return -ENODEV;
898
899 /* USB bulk command block */
900 cmd[0] = 0x55; /* bulk command signature */
901 cmd[1] = 0x53; /* bulk command signature */
902 cmd[2] = 0x42; /* bulk command signature */
903 cmd[3] = 0x43; /* bulk command signature */
904 cmd[14] = 6; /* command length */
905
906 cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
907 cmd[19] = 0x2; /* eject disc */
908
909 dev_info(&udev->dev, "Ejecting virtual installer media...\n");
910 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
911 cmd, 31, NULL, 2000);
912 kfree(cmd);
913 if (r)
914 return r;
915
916 /* At this point, the device disconnects and reconnects with the real
917 * ID numbers. */
918
919 usb_set_intfdata(intf, NULL);
920 return 0;
921 }
922
923 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
924 {
925 int r;
926 struct usb_device *udev = interface_to_usbdev(intf);
927 struct net_device *netdev = NULL;
928
929 print_id(udev);
930
931 if (id->driver_info & DEVICE_INSTALLER)
932 return eject_installer(intf);
933
934 switch (udev->speed) {
935 case USB_SPEED_LOW:
936 case USB_SPEED_FULL:
937 case USB_SPEED_HIGH:
938 break;
939 default:
940 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
941 r = -ENODEV;
942 goto error;
943 }
944
945 usb_reset_device(interface_to_usbdev(intf));
946
947 netdev = zd_netdev_alloc(intf);
948 if (netdev == NULL) {
949 r = -ENOMEM;
950 goto error;
951 }
952
953 r = upload_firmware(udev, id->driver_info);
954 if (r) {
955 dev_err(&intf->dev,
956 "couldn't load firmware. Error number %d\n", r);
957 goto error;
958 }
959
960 r = usb_reset_configuration(udev);
961 if (r) {
962 dev_dbg_f(&intf->dev,
963 "couldn't reset configuration. Error number %d\n", r);
964 goto error;
965 }
966
967 /* At this point the interrupt endpoint is not generally enabled. We
968 * save the USB bandwidth until the network device is opened. But
969 * notify that the initialization of the MAC will require the
970 * interrupts to be temporary enabled.
971 */
972 r = zd_mac_init_hw(zd_netdev_mac(netdev), id->driver_info);
973 if (r) {
974 dev_dbg_f(&intf->dev,
975 "couldn't initialize mac. Error number %d\n", r);
976 goto error;
977 }
978
979 r = register_netdev(netdev);
980 if (r) {
981 dev_dbg_f(&intf->dev,
982 "couldn't register netdev. Error number %d\n", r);
983 goto error;
984 }
985
986 dev_dbg_f(&intf->dev, "successful\n");
987 dev_info(&intf->dev,"%s\n", netdev->name);
988 return 0;
989 error:
990 usb_reset_device(interface_to_usbdev(intf));
991 zd_netdev_free(netdev);
992 return r;
993 }
994
995 static void disconnect(struct usb_interface *intf)
996 {
997 struct net_device *netdev = zd_intf_to_netdev(intf);
998 struct zd_mac *mac = zd_netdev_mac(netdev);
999 struct zd_usb *usb = &mac->chip.usb;
1000
1001 /* Either something really bad happened, or we're just dealing with
1002 * a DEVICE_INSTALLER. */
1003 if (netdev == NULL)
1004 return;
1005
1006 dev_dbg_f(zd_usb_dev(usb), "\n");
1007
1008 zd_netdev_disconnect(netdev);
1009
1010 /* Just in case something has gone wrong! */
1011 zd_usb_disable_rx(usb);
1012 zd_usb_disable_int(usb);
1013
1014 /* If the disconnect has been caused by a removal of the
1015 * driver module, the reset allows reloading of the driver. If the
1016 * reset will not be executed here, the upload of the firmware in the
1017 * probe function caused by the reloading of the driver will fail.
1018 */
1019 usb_reset_device(interface_to_usbdev(intf));
1020
1021 zd_netdev_free(netdev);
1022 dev_dbg(&intf->dev, "disconnected\n");
1023 }
1024
1025 static struct usb_driver driver = {
1026 .name = "zd1211rw",
1027 .id_table = usb_ids,
1028 .probe = probe,
1029 .disconnect = disconnect,
1030 };
1031
1032 struct workqueue_struct *zd_workqueue;
1033
1034 static int __init usb_init(void)
1035 {
1036 int r;
1037
1038 pr_debug("%s usb_init()\n", driver.name);
1039
1040 zd_workqueue = create_singlethread_workqueue(driver.name);
1041 if (zd_workqueue == NULL) {
1042 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1043 return -ENOMEM;
1044 }
1045
1046 r = usb_register(&driver);
1047 if (r) {
1048 destroy_workqueue(zd_workqueue);
1049 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1050 driver.name, r);
1051 return r;
1052 }
1053
1054 pr_debug("%s initialized\n", driver.name);
1055 return 0;
1056 }
1057
1058 static void __exit usb_exit(void)
1059 {
1060 pr_debug("%s usb_exit()\n", driver.name);
1061 usb_deregister(&driver);
1062 destroy_workqueue(zd_workqueue);
1063 }
1064
1065 module_init(usb_init);
1066 module_exit(usb_exit);
1067
1068 static int usb_int_regs_length(unsigned int count)
1069 {
1070 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1071 }
1072
1073 static void prepare_read_regs_int(struct zd_usb *usb)
1074 {
1075 struct zd_usb_interrupt *intr = &usb->intr;
1076
1077 spin_lock_irq(&intr->lock);
1078 intr->read_regs_enabled = 1;
1079 INIT_COMPLETION(intr->read_regs.completion);
1080 spin_unlock_irq(&intr->lock);
1081 }
1082
1083 static void disable_read_regs_int(struct zd_usb *usb)
1084 {
1085 struct zd_usb_interrupt *intr = &usb->intr;
1086
1087 spin_lock_irq(&intr->lock);
1088 intr->read_regs_enabled = 0;
1089 spin_unlock_irq(&intr->lock);
1090 }
1091
1092 static int get_results(struct zd_usb *usb, u16 *values,
1093 struct usb_req_read_regs *req, unsigned int count)
1094 {
1095 int r;
1096 int i;
1097 struct zd_usb_interrupt *intr = &usb->intr;
1098 struct read_regs_int *rr = &intr->read_regs;
1099 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1100
1101 spin_lock_irq(&intr->lock);
1102
1103 r = -EIO;
1104 /* The created block size seems to be larger than expected.
1105 * However results appear to be correct.
1106 */
1107 if (rr->length < usb_int_regs_length(count)) {
1108 dev_dbg_f(zd_usb_dev(usb),
1109 "error: actual length %d less than expected %d\n",
1110 rr->length, usb_int_regs_length(count));
1111 goto error_unlock;
1112 }
1113 if (rr->length > sizeof(rr->buffer)) {
1114 dev_dbg_f(zd_usb_dev(usb),
1115 "error: actual length %d exceeds buffer size %zu\n",
1116 rr->length, sizeof(rr->buffer));
1117 goto error_unlock;
1118 }
1119
1120 for (i = 0; i < count; i++) {
1121 struct reg_data *rd = &regs->regs[i];
1122 if (rd->addr != req->addr[i]) {
1123 dev_dbg_f(zd_usb_dev(usb),
1124 "rd[%d] addr %#06hx expected %#06hx\n", i,
1125 le16_to_cpu(rd->addr),
1126 le16_to_cpu(req->addr[i]));
1127 goto error_unlock;
1128 }
1129 values[i] = le16_to_cpu(rd->value);
1130 }
1131
1132 r = 0;
1133 error_unlock:
1134 spin_unlock_irq(&intr->lock);
1135 return r;
1136 }
1137
1138 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1139 const zd_addr_t *addresses, unsigned int count)
1140 {
1141 int r;
1142 int i, req_len, actual_req_len;
1143 struct usb_device *udev;
1144 struct usb_req_read_regs *req = NULL;
1145 unsigned long timeout;
1146
1147 if (count < 1) {
1148 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1149 return -EINVAL;
1150 }
1151 if (count > USB_MAX_IOREAD16_COUNT) {
1152 dev_dbg_f(zd_usb_dev(usb),
1153 "error: count %u exceeds possible max %u\n",
1154 count, USB_MAX_IOREAD16_COUNT);
1155 return -EINVAL;
1156 }
1157 if (in_atomic()) {
1158 dev_dbg_f(zd_usb_dev(usb),
1159 "error: io in atomic context not supported\n");
1160 return -EWOULDBLOCK;
1161 }
1162 if (!usb_int_enabled(usb)) {
1163 dev_dbg_f(zd_usb_dev(usb),
1164 "error: usb interrupt not enabled\n");
1165 return -EWOULDBLOCK;
1166 }
1167
1168 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1169 req = kmalloc(req_len, GFP_KERNEL);
1170 if (!req)
1171 return -ENOMEM;
1172 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1173 for (i = 0; i < count; i++)
1174 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1175
1176 udev = zd_usb_to_usbdev(usb);
1177 prepare_read_regs_int(usb);
1178 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1179 req, req_len, &actual_req_len, 1000 /* ms */);
1180 if (r) {
1181 dev_dbg_f(zd_usb_dev(usb),
1182 "error in usb_bulk_msg(). Error number %d\n", r);
1183 goto error;
1184 }
1185 if (req_len != actual_req_len) {
1186 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1187 " req_len %d != actual_req_len %d\n",
1188 req_len, actual_req_len);
1189 r = -EIO;
1190 goto error;
1191 }
1192
1193 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1194 msecs_to_jiffies(1000));
1195 if (!timeout) {
1196 disable_read_regs_int(usb);
1197 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1198 r = -ETIMEDOUT;
1199 goto error;
1200 }
1201
1202 r = get_results(usb, values, req, count);
1203 error:
1204 kfree(req);
1205 return r;
1206 }
1207
1208 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1209 unsigned int count)
1210 {
1211 int r;
1212 struct usb_device *udev;
1213 struct usb_req_write_regs *req = NULL;
1214 int i, req_len, actual_req_len;
1215
1216 if (count == 0)
1217 return 0;
1218 if (count > USB_MAX_IOWRITE16_COUNT) {
1219 dev_dbg_f(zd_usb_dev(usb),
1220 "error: count %u exceeds possible max %u\n",
1221 count, USB_MAX_IOWRITE16_COUNT);
1222 return -EINVAL;
1223 }
1224 if (in_atomic()) {
1225 dev_dbg_f(zd_usb_dev(usb),
1226 "error: io in atomic context not supported\n");
1227 return -EWOULDBLOCK;
1228 }
1229
1230 req_len = sizeof(struct usb_req_write_regs) +
1231 count * sizeof(struct reg_data);
1232 req = kmalloc(req_len, GFP_KERNEL);
1233 if (!req)
1234 return -ENOMEM;
1235
1236 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1237 for (i = 0; i < count; i++) {
1238 struct reg_data *rw = &req->reg_writes[i];
1239 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1240 rw->value = cpu_to_le16(ioreqs[i].value);
1241 }
1242
1243 udev = zd_usb_to_usbdev(usb);
1244 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1245 req, req_len, &actual_req_len, 1000 /* ms */);
1246 if (r) {
1247 dev_dbg_f(zd_usb_dev(usb),
1248 "error in usb_bulk_msg(). Error number %d\n", r);
1249 goto error;
1250 }
1251 if (req_len != actual_req_len) {
1252 dev_dbg_f(zd_usb_dev(usb),
1253 "error in usb_bulk_msg()"
1254 " req_len %d != actual_req_len %d\n",
1255 req_len, actual_req_len);
1256 r = -EIO;
1257 goto error;
1258 }
1259
1260 /* FALL-THROUGH with r == 0 */
1261 error:
1262 kfree(req);
1263 return r;
1264 }
1265
1266 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1267 {
1268 int r;
1269 struct usb_device *udev;
1270 struct usb_req_rfwrite *req = NULL;
1271 int i, req_len, actual_req_len;
1272 u16 bit_value_template;
1273
1274 if (in_atomic()) {
1275 dev_dbg_f(zd_usb_dev(usb),
1276 "error: io in atomic context not supported\n");
1277 return -EWOULDBLOCK;
1278 }
1279 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1280 dev_dbg_f(zd_usb_dev(usb),
1281 "error: bits %d are smaller than"
1282 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1283 bits, USB_MIN_RFWRITE_BIT_COUNT);
1284 return -EINVAL;
1285 }
1286 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1287 dev_dbg_f(zd_usb_dev(usb),
1288 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1289 bits, USB_MAX_RFWRITE_BIT_COUNT);
1290 return -EINVAL;
1291 }
1292 #ifdef DEBUG
1293 if (value & (~0UL << bits)) {
1294 dev_dbg_f(zd_usb_dev(usb),
1295 "error: value %#09x has bits >= %d set\n",
1296 value, bits);
1297 return -EINVAL;
1298 }
1299 #endif /* DEBUG */
1300
1301 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1302
1303 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1304 if (r) {
1305 dev_dbg_f(zd_usb_dev(usb),
1306 "error %d: Couldn't read CR203\n", r);
1307 goto out;
1308 }
1309 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1310
1311 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1312 req = kmalloc(req_len, GFP_KERNEL);
1313 if (!req)
1314 return -ENOMEM;
1315
1316 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1317 /* 1: 3683a, but not used in ZYDAS driver */
1318 req->value = cpu_to_le16(2);
1319 req->bits = cpu_to_le16(bits);
1320
1321 for (i = 0; i < bits; i++) {
1322 u16 bv = bit_value_template;
1323 if (value & (1 << (bits-1-i)))
1324 bv |= RF_DATA;
1325 req->bit_values[i] = cpu_to_le16(bv);
1326 }
1327
1328 udev = zd_usb_to_usbdev(usb);
1329 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1330 req, req_len, &actual_req_len, 1000 /* ms */);
1331 if (r) {
1332 dev_dbg_f(zd_usb_dev(usb),
1333 "error in usb_bulk_msg(). Error number %d\n", r);
1334 goto out;
1335 }
1336 if (req_len != actual_req_len) {
1337 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1338 " req_len %d != actual_req_len %d\n",
1339 req_len, actual_req_len);
1340 r = -EIO;
1341 goto out;
1342 }
1343
1344 /* FALL-THROUGH with r == 0 */
1345 out:
1346 kfree(req);
1347 return r;
1348 }
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