28d41a29d7b1ae2864816fb9ce26732fe06d3685
[linux-2.6.git] / drivers / net / wireless / zd1211rw / zd_usb.c
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         { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
75         /* "Driverless" devices that need ejecting */
76         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
77         { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
78         {}
79 };
80
81 MODULE_LICENSE("GPL");
82 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
83 MODULE_AUTHOR("Ulrich Kunitz");
84 MODULE_AUTHOR("Daniel Drake");
85 MODULE_VERSION("1.0");
86 MODULE_DEVICE_TABLE(usb, usb_ids);
87
88 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
89 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
90
91 /* USB device initialization */
92
93 static int request_fw_file(
94         const struct firmware **fw, const char *name, struct device *device)
95 {
96         int r;
97
98         dev_dbg_f(device, "fw name %s\n", name);
99
100         r = request_firmware(fw, name, device);
101         if (r)
102                 dev_err(device,
103                        "Could not load firmware file %s. Error number %d\n",
104                        name, r);
105         return r;
106 }
107
108 static inline u16 get_bcdDevice(const struct usb_device *udev)
109 {
110         return le16_to_cpu(udev->descriptor.bcdDevice);
111 }
112
113 enum upload_code_flags {
114         REBOOT = 1,
115 };
116
117 /* Ensures that MAX_TRANSFER_SIZE is even. */
118 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
119
120 static int upload_code(struct usb_device *udev,
121         const u8 *data, size_t size, u16 code_offset, int flags)
122 {
123         u8 *p;
124         int r;
125
126         /* USB request blocks need "kmalloced" buffers.
127          */
128         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
129         if (!p) {
130                 dev_err(&udev->dev, "out of memory\n");
131                 r = -ENOMEM;
132                 goto error;
133         }
134
135         size &= ~1;
136         while (size > 0) {
137                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
138                         size : MAX_TRANSFER_SIZE;
139
140                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
141
142                 memcpy(p, data, transfer_size);
143                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
144                         USB_REQ_FIRMWARE_DOWNLOAD,
145                         USB_DIR_OUT | USB_TYPE_VENDOR,
146                         code_offset, 0, p, transfer_size, 1000 /* ms */);
147                 if (r < 0) {
148                         dev_err(&udev->dev,
149                                "USB control request for firmware upload"
150                                " failed. Error number %d\n", r);
151                         goto error;
152                 }
153                 transfer_size = r & ~1;
154
155                 size -= transfer_size;
156                 data += transfer_size;
157                 code_offset += transfer_size/sizeof(u16);
158         }
159
160         if (flags & REBOOT) {
161                 u8 ret;
162
163                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
164                         USB_REQ_FIRMWARE_CONFIRM,
165                         USB_DIR_IN | USB_TYPE_VENDOR,
166                         0, 0, &ret, sizeof(ret), 5000 /* ms */);
167                 if (r != sizeof(ret)) {
168                         dev_err(&udev->dev,
169                                 "control request firmeware confirmation failed."
170                                 " Return value %d\n", r);
171                         if (r >= 0)
172                                 r = -ENODEV;
173                         goto error;
174                 }
175                 if (ret & 0x80) {
176                         dev_err(&udev->dev,
177                                 "Internal error while downloading."
178                                 " Firmware confirm return value %#04x\n",
179                                 (unsigned int)ret);
180                         r = -ENODEV;
181                         goto error;
182                 }
183                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
184                         (unsigned int)ret);
185         }
186
187         r = 0;
188 error:
189         kfree(p);
190         return r;
191 }
192
193 static u16 get_word(const void *data, u16 offset)
194 {
195         const __le16 *p = data;
196         return le16_to_cpu(p[offset]);
197 }
198
199 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
200                        const char* postfix)
201 {
202         scnprintf(buffer, size, "%s%s",
203                 usb->is_zd1211b ?
204                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
205                 postfix);
206         return buffer;
207 }
208
209 static int handle_version_mismatch(struct zd_usb *usb,
210         const struct firmware *ub_fw)
211 {
212         struct usb_device *udev = zd_usb_to_usbdev(usb);
213         const struct firmware *ur_fw = NULL;
214         int offset;
215         int r = 0;
216         char fw_name[128];
217
218         r = request_fw_file(&ur_fw,
219                 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
220                 &udev->dev);
221         if (r)
222                 goto error;
223
224         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
225         if (r)
226                 goto error;
227
228         offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
229         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
230                 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
231
232         /* At this point, the vendor driver downloads the whole firmware
233          * image, hacks around with version IDs, and uploads it again,
234          * completely overwriting the boot code. We do not do this here as
235          * it is not required on any tested devices, and it is suspected to
236          * cause problems. */
237 error:
238         release_firmware(ur_fw);
239         return r;
240 }
241
242 static int upload_firmware(struct zd_usb *usb)
243 {
244         int r;
245         u16 fw_bcdDevice;
246         u16 bcdDevice;
247         struct usb_device *udev = zd_usb_to_usbdev(usb);
248         const struct firmware *ub_fw = NULL;
249         const struct firmware *uph_fw = NULL;
250         char fw_name[128];
251
252         bcdDevice = get_bcdDevice(udev);
253
254         r = request_fw_file(&ub_fw,
255                 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
256                 &udev->dev);
257         if (r)
258                 goto error;
259
260         fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
261
262         if (fw_bcdDevice != bcdDevice) {
263                 dev_info(&udev->dev,
264                         "firmware version %#06x and device bootcode version "
265                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
266                 if (bcdDevice <= 0x4313)
267                         dev_warn(&udev->dev, "device has old bootcode, please "
268                                 "report success or failure\n");
269
270                 r = handle_version_mismatch(usb, ub_fw);
271                 if (r)
272                         goto error;
273         } else {
274                 dev_dbg_f(&udev->dev,
275                         "firmware device id %#06x is equal to the "
276                         "actual device id\n", fw_bcdDevice);
277         }
278
279
280         r = request_fw_file(&uph_fw,
281                 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
282                 &udev->dev);
283         if (r)
284                 goto error;
285
286         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
287         if (r) {
288                 dev_err(&udev->dev,
289                         "Could not upload firmware code uph. Error number %d\n",
290                         r);
291         }
292
293         /* FALL-THROUGH */
294 error:
295         release_firmware(ub_fw);
296         release_firmware(uph_fw);
297         return r;
298 }
299
300 /* Read data from device address space using "firmware interface" which does
301  * not require firmware to be loaded. */
302 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
303 {
304         int r;
305         struct usb_device *udev = zd_usb_to_usbdev(usb);
306
307         r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
308                 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
309                 data, len, 5000);
310         if (r < 0) {
311                 dev_err(&udev->dev,
312                         "read over firmware interface failed: %d\n", r);
313                 return r;
314         } else if (r != len) {
315                 dev_err(&udev->dev,
316                         "incomplete read over firmware interface: %d/%d\n",
317                         r, len);
318                 return -EIO;
319         }
320
321         return 0;
322 }
323
324 #define urb_dev(urb) (&(urb)->dev->dev)
325
326 static inline void handle_regs_int(struct urb *urb)
327 {
328         struct zd_usb *usb = urb->context;
329         struct zd_usb_interrupt *intr = &usb->intr;
330         int len;
331
332         ZD_ASSERT(in_interrupt());
333         spin_lock(&intr->lock);
334
335         if (intr->read_regs_enabled) {
336                 intr->read_regs.length = len = urb->actual_length;
337
338                 if (len > sizeof(intr->read_regs.buffer))
339                         len = sizeof(intr->read_regs.buffer);
340                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
341                 intr->read_regs_enabled = 0;
342                 complete(&intr->read_regs.completion);
343                 goto out;
344         }
345
346         dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
347 out:
348         spin_unlock(&intr->lock);
349 }
350
351 static inline void handle_retry_failed_int(struct urb *urb)
352 {
353         struct zd_usb *usb = urb->context;
354         struct zd_mac *mac = zd_usb_to_mac(usb);
355         struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
356
357         ieee->stats.tx_errors++;
358         ieee->ieee_stats.tx_retry_limit_exceeded++;
359         dev_dbg_f(urb_dev(urb), "retry failed interrupt\n");
360 }
361
362
363 static void int_urb_complete(struct urb *urb)
364 {
365         int r;
366         struct usb_int_header *hdr;
367
368         switch (urb->status) {
369         case 0:
370                 break;
371         case -ESHUTDOWN:
372         case -EINVAL:
373         case -ENODEV:
374         case -ENOENT:
375         case -ECONNRESET:
376         case -EPIPE:
377                 goto kfree;
378         default:
379                 goto resubmit;
380         }
381
382         if (urb->actual_length < sizeof(hdr)) {
383                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
384                 goto resubmit;
385         }
386
387         hdr = urb->transfer_buffer;
388         if (hdr->type != USB_INT_TYPE) {
389                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
390                 goto resubmit;
391         }
392
393         switch (hdr->id) {
394         case USB_INT_ID_REGS:
395                 handle_regs_int(urb);
396                 break;
397         case USB_INT_ID_RETRY_FAILED:
398                 handle_retry_failed_int(urb);
399                 break;
400         default:
401                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
402                         (unsigned int)hdr->id);
403                 goto resubmit;
404         }
405
406 resubmit:
407         r = usb_submit_urb(urb, GFP_ATOMIC);
408         if (r) {
409                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
410                 goto kfree;
411         }
412         return;
413 kfree:
414         kfree(urb->transfer_buffer);
415 }
416
417 static inline int int_urb_interval(struct usb_device *udev)
418 {
419         switch (udev->speed) {
420         case USB_SPEED_HIGH:
421                 return 4;
422         case USB_SPEED_LOW:
423                 return 10;
424         case USB_SPEED_FULL:
425         default:
426                 return 1;
427         }
428 }
429
430 static inline int usb_int_enabled(struct zd_usb *usb)
431 {
432         unsigned long flags;
433         struct zd_usb_interrupt *intr = &usb->intr;
434         struct urb *urb;
435
436         spin_lock_irqsave(&intr->lock, flags);
437         urb = intr->urb;
438         spin_unlock_irqrestore(&intr->lock, flags);
439         return urb != NULL;
440 }
441
442 int zd_usb_enable_int(struct zd_usb *usb)
443 {
444         int r;
445         struct usb_device *udev;
446         struct zd_usb_interrupt *intr = &usb->intr;
447         void *transfer_buffer = NULL;
448         struct urb *urb;
449
450         dev_dbg_f(zd_usb_dev(usb), "\n");
451
452         urb = usb_alloc_urb(0, GFP_KERNEL);
453         if (!urb) {
454                 r = -ENOMEM;
455                 goto out;
456         }
457
458         ZD_ASSERT(!irqs_disabled());
459         spin_lock_irq(&intr->lock);
460         if (intr->urb) {
461                 spin_unlock_irq(&intr->lock);
462                 r = 0;
463                 goto error_free_urb;
464         }
465         intr->urb = urb;
466         spin_unlock_irq(&intr->lock);
467
468         /* TODO: make it a DMA buffer */
469         r = -ENOMEM;
470         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
471         if (!transfer_buffer) {
472                 dev_dbg_f(zd_usb_dev(usb),
473                         "couldn't allocate transfer_buffer\n");
474                 goto error_set_urb_null;
475         }
476
477         udev = zd_usb_to_usbdev(usb);
478         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
479                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
480                          int_urb_complete, usb,
481                          intr->interval);
482
483         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
484         r = usb_submit_urb(urb, GFP_KERNEL);
485         if (r) {
486                 dev_dbg_f(zd_usb_dev(usb),
487                          "Couldn't submit urb. Error number %d\n", r);
488                 goto error;
489         }
490
491         return 0;
492 error:
493         kfree(transfer_buffer);
494 error_set_urb_null:
495         spin_lock_irq(&intr->lock);
496         intr->urb = NULL;
497         spin_unlock_irq(&intr->lock);
498 error_free_urb:
499         usb_free_urb(urb);
500 out:
501         return r;
502 }
503
504 void zd_usb_disable_int(struct zd_usb *usb)
505 {
506         unsigned long flags;
507         struct zd_usb_interrupt *intr = &usb->intr;
508         struct urb *urb;
509
510         spin_lock_irqsave(&intr->lock, flags);
511         urb = intr->urb;
512         if (!urb) {
513                 spin_unlock_irqrestore(&intr->lock, flags);
514                 return;
515         }
516         intr->urb = NULL;
517         spin_unlock_irqrestore(&intr->lock, flags);
518
519         usb_kill_urb(urb);
520         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
521         usb_free_urb(urb);
522 }
523
524 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
525                              unsigned int length)
526 {
527         int i;
528         struct zd_mac *mac = zd_usb_to_mac(usb);
529         const struct rx_length_info *length_info;
530
531         if (length < sizeof(struct rx_length_info)) {
532                 /* It's not a complete packet anyhow. */
533                 struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
534                 ieee->stats.rx_errors++;
535                 ieee->stats.rx_length_errors++;
536                 return;
537         }
538         length_info = (struct rx_length_info *)
539                 (buffer + length - sizeof(struct rx_length_info));
540
541         /* It might be that three frames are merged into a single URB
542          * transaction. We have to check for the length info tag.
543          *
544          * While testing we discovered that length_info might be unaligned,
545          * because if USB transactions are merged, the last packet will not
546          * be padded. Unaligned access might also happen if the length_info
547          * structure is not present.
548          */
549         if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
550         {
551                 unsigned int l, k, n;
552                 for (i = 0, l = 0;; i++) {
553                         k = le16_to_cpu(get_unaligned(&length_info->length[i]));
554                         if (k == 0)
555                                 return;
556                         n = l+k;
557                         if (n > length)
558                                 return;
559                         zd_mac_rx_irq(mac, buffer+l, k);
560                         if (i >= 2)
561                                 return;
562                         l = (n+3) & ~3;
563                 }
564         } else {
565                 zd_mac_rx_irq(mac, buffer, length);
566         }
567 }
568
569 static void rx_urb_complete(struct urb *urb)
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:
584         case -EPIPE:
585                 return;
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
623 resubmit:
624         usb_submit_urb(urb, GFP_ATOMIC);
625 }
626
627 static struct 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_KERNEL);
634         if (!urb)
635                 return NULL;
636         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
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
651 static void 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
660 int 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_KERNEL);
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_KERNEL);
691                 if (r)
692                         goto error_submit;
693         }
694
695         return 0;
696 error_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);
704 error:
705         if (urbs) {
706                 for (i = 0; i < URBS_COUNT; i++)
707                         free_urb(urbs[i]);
708         }
709         return r;
710 }
711
712 void 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
739 static void tx_urb_complete(struct urb *urb)
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:
751         case -EPIPE:
752                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
753                 break;
754         default:
755                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
756                 goto resubmit;
757         }
758 free_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;
763 resubmit:
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  */
774 int 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;
803 error:
804         usb_buffer_free(zd_usb_to_usbdev(usb), length, buffer,
805                         urb->transfer_dma);
806 error_free_urb:
807         usb_free_urb(urb);
808 out:
809         return r;
810 }
811
812 static 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((u16)CR_INTERRUPT);
820 }
821
822 static 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
834 static 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
840 void 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
851 void zd_usb_clear(struct zd_usb *usb)
852 {
853         usb_set_intfdata(usb->intf, NULL);
854         usb_put_intf(usb->intf);
855         ZD_MEMCLEAR(usb, sizeof(*usb));
856         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
857 }
858
859 static const char *speed(enum usb_device_speed speed)
860 {
861         switch (speed) {
862         case USB_SPEED_LOW:
863                 return "low";
864         case USB_SPEED_FULL:
865                 return "full";
866         case USB_SPEED_HIGH:
867                 return "high";
868         default:
869                 return "unknown speed";
870         }
871 }
872
873 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
874 {
875         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
876                 le16_to_cpu(udev->descriptor.idVendor),
877                 le16_to_cpu(udev->descriptor.idProduct),
878                 get_bcdDevice(udev),
879                 speed(udev->speed));
880 }
881
882 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
883 {
884         struct usb_device *udev = interface_to_usbdev(usb->intf);
885         return scnprint_id(udev, buffer, size);
886 }
887
888 #ifdef DEBUG
889 static void print_id(struct usb_device *udev)
890 {
891         char buffer[40];
892
893         scnprint_id(udev, buffer, sizeof(buffer));
894         buffer[sizeof(buffer)-1] = 0;
895         dev_dbg_f(&udev->dev, "%s\n", buffer);
896 }
897 #else
898 #define print_id(udev) do { } while (0)
899 #endif
900
901 static int eject_installer(struct usb_interface *intf)
902 {
903         struct usb_device *udev = interface_to_usbdev(intf);
904         struct usb_host_interface *iface_desc = &intf->altsetting[0];
905         struct usb_endpoint_descriptor *endpoint;
906         unsigned char *cmd;
907         u8 bulk_out_ep;
908         int r;
909
910         /* Find bulk out endpoint */
911         endpoint = &iface_desc->endpoint[1].desc;
912         if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
913             (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
914             USB_ENDPOINT_XFER_BULK) {
915                 bulk_out_ep = endpoint->bEndpointAddress;
916         } else {
917                 dev_err(&udev->dev,
918                         "zd1211rw: Could not find bulk out endpoint\n");
919                 return -ENODEV;
920         }
921
922         cmd = kzalloc(31, GFP_KERNEL);
923         if (cmd == NULL)
924                 return -ENODEV;
925
926         /* USB bulk command block */
927         cmd[0] = 0x55;  /* bulk command signature */
928         cmd[1] = 0x53;  /* bulk command signature */
929         cmd[2] = 0x42;  /* bulk command signature */
930         cmd[3] = 0x43;  /* bulk command signature */
931         cmd[14] = 6;    /* command length */
932
933         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
934         cmd[19] = 0x2;  /* eject disc */
935
936         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
937         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
938                 cmd, 31, NULL, 2000);
939         kfree(cmd);
940         if (r)
941                 return r;
942
943         /* At this point, the device disconnects and reconnects with the real
944          * ID numbers. */
945
946         usb_set_intfdata(intf, NULL);
947         return 0;
948 }
949
950 int zd_usb_init_hw(struct zd_usb *usb)
951 {
952         int r;
953         struct zd_mac *mac = zd_usb_to_mac(usb);
954
955         dev_dbg_f(zd_usb_dev(usb), "\n");
956
957         r = upload_firmware(usb);
958         if (r) {
959                 dev_err(zd_usb_dev(usb),
960                        "couldn't load firmware. Error number %d\n", r);
961                 return r;
962         }
963
964         r = usb_reset_configuration(zd_usb_to_usbdev(usb));
965         if (r) {
966                 dev_dbg_f(zd_usb_dev(usb),
967                         "couldn't reset configuration. Error number %d\n", r);
968                 return r;
969         }
970
971         r = zd_mac_init_hw(mac);
972         if (r) {
973                 dev_dbg_f(zd_usb_dev(usb),
974                          "couldn't initialize mac. Error number %d\n", r);
975                 return r;
976         }
977
978         usb->initialized = 1;
979         return 0;
980 }
981
982 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
983 {
984         int r;
985         struct zd_usb *usb;
986         struct usb_device *udev = interface_to_usbdev(intf);
987         struct net_device *netdev = NULL;
988
989         print_id(udev);
990
991         if (id->driver_info & DEVICE_INSTALLER)
992                 return eject_installer(intf);
993
994         switch (udev->speed) {
995         case USB_SPEED_LOW:
996         case USB_SPEED_FULL:
997         case USB_SPEED_HIGH:
998                 break;
999         default:
1000                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1001                 r = -ENODEV;
1002                 goto error;
1003         }
1004
1005         usb_reset_device(interface_to_usbdev(intf));
1006
1007         netdev = zd_netdev_alloc(intf);
1008         if (netdev == NULL) {
1009                 r = -ENOMEM;
1010                 goto error;
1011         }
1012
1013         usb = &zd_netdev_mac(netdev)->chip.usb;
1014         usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1015
1016         r = zd_mac_preinit_hw(zd_netdev_mac(netdev));
1017         if (r) {
1018                 dev_dbg_f(&intf->dev,
1019                          "couldn't initialize mac. Error number %d\n", r);
1020                 goto error;
1021         }
1022
1023         r = register_netdev(netdev);
1024         if (r) {
1025                 dev_dbg_f(&intf->dev,
1026                          "couldn't register netdev. Error number %d\n", r);
1027                 goto error;
1028         }
1029
1030         dev_dbg_f(&intf->dev, "successful\n");
1031         dev_info(&intf->dev,"%s\n", netdev->name);
1032         return 0;
1033 error:
1034         usb_reset_device(interface_to_usbdev(intf));
1035         zd_netdev_free(netdev);
1036         return r;
1037 }
1038
1039 static void disconnect(struct usb_interface *intf)
1040 {
1041         struct net_device *netdev = zd_intf_to_netdev(intf);
1042         struct zd_mac *mac = zd_netdev_mac(netdev);
1043         struct zd_usb *usb = &mac->chip.usb;
1044
1045         /* Either something really bad happened, or we're just dealing with
1046          * a DEVICE_INSTALLER. */
1047         if (netdev == NULL)
1048                 return;
1049
1050         dev_dbg_f(zd_usb_dev(usb), "\n");
1051
1052         zd_netdev_disconnect(netdev);
1053
1054         /* Just in case something has gone wrong! */
1055         zd_usb_disable_rx(usb);
1056         zd_usb_disable_int(usb);
1057
1058         /* If the disconnect has been caused by a removal of the
1059          * driver module, the reset allows reloading of the driver. If the
1060          * reset will not be executed here, the upload of the firmware in the
1061          * probe function caused by the reloading of the driver will fail.
1062          */
1063         usb_reset_device(interface_to_usbdev(intf));
1064
1065         zd_netdev_free(netdev);
1066         dev_dbg(&intf->dev, "disconnected\n");
1067 }
1068
1069 static struct usb_driver driver = {
1070         .name           = "zd1211rw",
1071         .id_table       = usb_ids,
1072         .probe          = probe,
1073         .disconnect     = disconnect,
1074 };
1075
1076 struct workqueue_struct *zd_workqueue;
1077
1078 static int __init usb_init(void)
1079 {
1080         int r;
1081
1082         pr_debug("%s usb_init()\n", driver.name);
1083
1084         zd_workqueue = create_singlethread_workqueue(driver.name);
1085         if (zd_workqueue == NULL) {
1086                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1087                 return -ENOMEM;
1088         }
1089
1090         r = usb_register(&driver);
1091         if (r) {
1092                 destroy_workqueue(zd_workqueue);
1093                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1094                        driver.name, r);
1095                 return r;
1096         }
1097
1098         pr_debug("%s initialized\n", driver.name);
1099         return 0;
1100 }
1101
1102 static void __exit usb_exit(void)
1103 {
1104         pr_debug("%s usb_exit()\n", driver.name);
1105         usb_deregister(&driver);
1106         destroy_workqueue(zd_workqueue);
1107 }
1108
1109 module_init(usb_init);
1110 module_exit(usb_exit);
1111
1112 static int usb_int_regs_length(unsigned int count)
1113 {
1114         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1115 }
1116
1117 static void prepare_read_regs_int(struct zd_usb *usb)
1118 {
1119         struct zd_usb_interrupt *intr = &usb->intr;
1120
1121         spin_lock_irq(&intr->lock);
1122         intr->read_regs_enabled = 1;
1123         INIT_COMPLETION(intr->read_regs.completion);
1124         spin_unlock_irq(&intr->lock);
1125 }
1126
1127 static void disable_read_regs_int(struct zd_usb *usb)
1128 {
1129         struct zd_usb_interrupt *intr = &usb->intr;
1130
1131         spin_lock_irq(&intr->lock);
1132         intr->read_regs_enabled = 0;
1133         spin_unlock_irq(&intr->lock);
1134 }
1135
1136 static int get_results(struct zd_usb *usb, u16 *values,
1137                        struct usb_req_read_regs *req, unsigned int count)
1138 {
1139         int r;
1140         int i;
1141         struct zd_usb_interrupt *intr = &usb->intr;
1142         struct read_regs_int *rr = &intr->read_regs;
1143         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1144
1145         spin_lock_irq(&intr->lock);
1146
1147         r = -EIO;
1148         /* The created block size seems to be larger than expected.
1149          * However results appear to be correct.
1150          */
1151         if (rr->length < usb_int_regs_length(count)) {
1152                 dev_dbg_f(zd_usb_dev(usb),
1153                          "error: actual length %d less than expected %d\n",
1154                          rr->length, usb_int_regs_length(count));
1155                 goto error_unlock;
1156         }
1157         if (rr->length > sizeof(rr->buffer)) {
1158                 dev_dbg_f(zd_usb_dev(usb),
1159                          "error: actual length %d exceeds buffer size %zu\n",
1160                          rr->length, sizeof(rr->buffer));
1161                 goto error_unlock;
1162         }
1163
1164         for (i = 0; i < count; i++) {
1165                 struct reg_data *rd = &regs->regs[i];
1166                 if (rd->addr != req->addr[i]) {
1167                         dev_dbg_f(zd_usb_dev(usb),
1168                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1169                                  le16_to_cpu(rd->addr),
1170                                  le16_to_cpu(req->addr[i]));
1171                         goto error_unlock;
1172                 }
1173                 values[i] = le16_to_cpu(rd->value);
1174         }
1175
1176         r = 0;
1177 error_unlock:
1178         spin_unlock_irq(&intr->lock);
1179         return r;
1180 }
1181
1182 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1183                      const zd_addr_t *addresses, unsigned int count)
1184 {
1185         int r;
1186         int i, req_len, actual_req_len;
1187         struct usb_device *udev;
1188         struct usb_req_read_regs *req = NULL;
1189         unsigned long timeout;
1190
1191         if (count < 1) {
1192                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1193                 return -EINVAL;
1194         }
1195         if (count > USB_MAX_IOREAD16_COUNT) {
1196                 dev_dbg_f(zd_usb_dev(usb),
1197                          "error: count %u exceeds possible max %u\n",
1198                          count, USB_MAX_IOREAD16_COUNT);
1199                 return -EINVAL;
1200         }
1201         if (in_atomic()) {
1202                 dev_dbg_f(zd_usb_dev(usb),
1203                          "error: io in atomic context not supported\n");
1204                 return -EWOULDBLOCK;
1205         }
1206         if (!usb_int_enabled(usb)) {
1207                  dev_dbg_f(zd_usb_dev(usb),
1208                           "error: usb interrupt not enabled\n");
1209                 return -EWOULDBLOCK;
1210         }
1211
1212         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1213         req = kmalloc(req_len, GFP_KERNEL);
1214         if (!req)
1215                 return -ENOMEM;
1216         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1217         for (i = 0; i < count; i++)
1218                 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1219
1220         udev = zd_usb_to_usbdev(usb);
1221         prepare_read_regs_int(usb);
1222         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1223                          req, req_len, &actual_req_len, 1000 /* ms */);
1224         if (r) {
1225                 dev_dbg_f(zd_usb_dev(usb),
1226                         "error in usb_bulk_msg(). Error number %d\n", r);
1227                 goto error;
1228         }
1229         if (req_len != actual_req_len) {
1230                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1231                         " req_len %d != actual_req_len %d\n",
1232                         req_len, actual_req_len);
1233                 r = -EIO;
1234                 goto error;
1235         }
1236
1237         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1238                                               msecs_to_jiffies(1000));
1239         if (!timeout) {
1240                 disable_read_regs_int(usb);
1241                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1242                 r = -ETIMEDOUT;
1243                 goto error;
1244         }
1245
1246         r = get_results(usb, values, req, count);
1247 error:
1248         kfree(req);
1249         return r;
1250 }
1251
1252 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1253                       unsigned int count)
1254 {
1255         int r;
1256         struct usb_device *udev;
1257         struct usb_req_write_regs *req = NULL;
1258         int i, req_len, actual_req_len;
1259
1260         if (count == 0)
1261                 return 0;
1262         if (count > USB_MAX_IOWRITE16_COUNT) {
1263                 dev_dbg_f(zd_usb_dev(usb),
1264                         "error: count %u exceeds possible max %u\n",
1265                         count, USB_MAX_IOWRITE16_COUNT);
1266                 return -EINVAL;
1267         }
1268         if (in_atomic()) {
1269                 dev_dbg_f(zd_usb_dev(usb),
1270                         "error: io in atomic context not supported\n");
1271                 return -EWOULDBLOCK;
1272         }
1273
1274         req_len = sizeof(struct usb_req_write_regs) +
1275                   count * sizeof(struct reg_data);
1276         req = kmalloc(req_len, GFP_KERNEL);
1277         if (!req)
1278                 return -ENOMEM;
1279
1280         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1281         for (i = 0; i < count; i++) {
1282                 struct reg_data *rw  = &req->reg_writes[i];
1283                 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1284                 rw->value = cpu_to_le16(ioreqs[i].value);
1285         }
1286
1287         udev = zd_usb_to_usbdev(usb);
1288         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1289                          req, req_len, &actual_req_len, 1000 /* ms */);
1290         if (r) {
1291                 dev_dbg_f(zd_usb_dev(usb),
1292                         "error in usb_bulk_msg(). Error number %d\n", r);
1293                 goto error;
1294         }
1295         if (req_len != actual_req_len) {
1296                 dev_dbg_f(zd_usb_dev(usb),
1297                         "error in usb_bulk_msg()"
1298                         " req_len %d != actual_req_len %d\n",
1299                         req_len, actual_req_len);
1300                 r = -EIO;
1301                 goto error;
1302         }
1303
1304         /* FALL-THROUGH with r == 0 */
1305 error:
1306         kfree(req);
1307         return r;
1308 }
1309
1310 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1311 {
1312         int r;
1313         struct usb_device *udev;
1314         struct usb_req_rfwrite *req = NULL;
1315         int i, req_len, actual_req_len;
1316         u16 bit_value_template;
1317
1318         if (in_atomic()) {
1319                 dev_dbg_f(zd_usb_dev(usb),
1320                         "error: io in atomic context not supported\n");
1321                 return -EWOULDBLOCK;
1322         }
1323         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1324                 dev_dbg_f(zd_usb_dev(usb),
1325                         "error: bits %d are smaller than"
1326                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1327                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1328                 return -EINVAL;
1329         }
1330         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1331                 dev_dbg_f(zd_usb_dev(usb),
1332                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1333                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1334                 return -EINVAL;
1335         }
1336 #ifdef DEBUG
1337         if (value & (~0UL << bits)) {
1338                 dev_dbg_f(zd_usb_dev(usb),
1339                         "error: value %#09x has bits >= %d set\n",
1340                         value, bits);
1341                 return -EINVAL;
1342         }
1343 #endif /* DEBUG */
1344
1345         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1346
1347         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1348         if (r) {
1349                 dev_dbg_f(zd_usb_dev(usb),
1350                         "error %d: Couldn't read CR203\n", r);
1351                 goto out;
1352         }
1353         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1354
1355         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1356         req = kmalloc(req_len, GFP_KERNEL);
1357         if (!req)
1358                 return -ENOMEM;
1359
1360         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1361         /* 1: 3683a, but not used in ZYDAS driver */
1362         req->value = cpu_to_le16(2);
1363         req->bits = cpu_to_le16(bits);
1364
1365         for (i = 0; i < bits; i++) {
1366                 u16 bv = bit_value_template;
1367                 if (value & (1 << (bits-1-i)))
1368                         bv |= RF_DATA;
1369                 req->bit_values[i] = cpu_to_le16(bv);
1370         }
1371
1372         udev = zd_usb_to_usbdev(usb);
1373         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1374                          req, req_len, &actual_req_len, 1000 /* ms */);
1375         if (r) {
1376                 dev_dbg_f(zd_usb_dev(usb),
1377                         "error in usb_bulk_msg(). Error number %d\n", r);
1378                 goto out;
1379         }
1380         if (req_len != actual_req_len) {
1381                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1382                         " req_len %d != actual_req_len %d\n",
1383                         req_len, actual_req_len);
1384                 r = -EIO;
1385                 goto out;
1386         }
1387
1388         /* FALL-THROUGH with r == 0 */
1389 out:
1390         kfree(req);
1391         return r;
1392 }