Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide-2.6
[linux-2.6] / drivers / net / wireless / zd1211rw / zd_usb.c
1 /* ZD1211 USB-WLAN driver for Linux
2  *
3  * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
4  * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
5  * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21
22 #include <linux/kernel.h>
23 #include <linux/init.h>
24 #include <linux/firmware.h>
25 #include <linux/device.h>
26 #include <linux/errno.h>
27 #include <linux/skbuff.h>
28 #include <linux/usb.h>
29 #include <linux/workqueue.h>
30 #include <net/mac80211.h>
31 #include <asm/unaligned.h>
32
33 #include "zd_def.h"
34 #include "zd_mac.h"
35 #include "zd_usb.h"
36
37 static struct usb_device_id usb_ids[] = {
38         /* ZD1211 */
39         { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
40         { USB_DEVICE(0x0ace, 0xa211), .driver_info = DEVICE_ZD1211 },
41         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
42         { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
43         { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
44         { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
45         { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
46         { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
47         { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
48         { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
49         { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
50         { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
51         { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
52         { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
53         { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
54         { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
55         { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
56         { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
57         { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
58         { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
59         { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
60         { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 },
61         { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
62         { USB_DEVICE(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 },
63         /* ZD1211B */
64         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
65         { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B },
66         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
67         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
68         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
69         { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
70         { USB_DEVICE(0x083a, 0xe503), .driver_info = DEVICE_ZD1211B },
71         { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
72         { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
73         { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
74         { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
75         { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
76         { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
77         { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
78         { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
79         { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
80         { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
81         { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
82         { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
83         { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
84         { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
85         { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
86         { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
87         { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
88         { USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B },
89         { USB_DEVICE(0x0df6, 0x0036), .driver_info = DEVICE_ZD1211B },
90         /* "Driverless" devices that need ejecting */
91         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
92         { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
93         {}
94 };
95
96 MODULE_LICENSE("GPL");
97 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
98 MODULE_AUTHOR("Ulrich Kunitz");
99 MODULE_AUTHOR("Daniel Drake");
100 MODULE_VERSION("1.0");
101 MODULE_DEVICE_TABLE(usb, usb_ids);
102
103 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
104 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
105
106 /* USB device initialization */
107 static void int_urb_complete(struct urb *urb);
108
109 static int request_fw_file(
110         const struct firmware **fw, const char *name, struct device *device)
111 {
112         int r;
113
114         dev_dbg_f(device, "fw name %s\n", name);
115
116         r = request_firmware(fw, name, device);
117         if (r)
118                 dev_err(device,
119                        "Could not load firmware file %s. Error number %d\n",
120                        name, r);
121         return r;
122 }
123
124 static inline u16 get_bcdDevice(const struct usb_device *udev)
125 {
126         return le16_to_cpu(udev->descriptor.bcdDevice);
127 }
128
129 enum upload_code_flags {
130         REBOOT = 1,
131 };
132
133 /* Ensures that MAX_TRANSFER_SIZE is even. */
134 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
135
136 static int upload_code(struct usb_device *udev,
137         const u8 *data, size_t size, u16 code_offset, int flags)
138 {
139         u8 *p;
140         int r;
141
142         /* USB request blocks need "kmalloced" buffers.
143          */
144         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
145         if (!p) {
146                 dev_err(&udev->dev, "out of memory\n");
147                 r = -ENOMEM;
148                 goto error;
149         }
150
151         size &= ~1;
152         while (size > 0) {
153                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
154                         size : MAX_TRANSFER_SIZE;
155
156                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
157
158                 memcpy(p, data, transfer_size);
159                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
160                         USB_REQ_FIRMWARE_DOWNLOAD,
161                         USB_DIR_OUT | USB_TYPE_VENDOR,
162                         code_offset, 0, p, transfer_size, 1000 /* ms */);
163                 if (r < 0) {
164                         dev_err(&udev->dev,
165                                "USB control request for firmware upload"
166                                " failed. Error number %d\n", r);
167                         goto error;
168                 }
169                 transfer_size = r & ~1;
170
171                 size -= transfer_size;
172                 data += transfer_size;
173                 code_offset += transfer_size/sizeof(u16);
174         }
175
176         if (flags & REBOOT) {
177                 u8 ret;
178
179                 /* Use "DMA-aware" buffer. */
180                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
181                         USB_REQ_FIRMWARE_CONFIRM,
182                         USB_DIR_IN | USB_TYPE_VENDOR,
183                         0, 0, p, sizeof(ret), 5000 /* ms */);
184                 if (r != sizeof(ret)) {
185                         dev_err(&udev->dev,
186                                 "control request firmeware confirmation failed."
187                                 " Return value %d\n", r);
188                         if (r >= 0)
189                                 r = -ENODEV;
190                         goto error;
191                 }
192                 ret = p[0];
193                 if (ret & 0x80) {
194                         dev_err(&udev->dev,
195                                 "Internal error while downloading."
196                                 " Firmware confirm return value %#04x\n",
197                                 (unsigned int)ret);
198                         r = -ENODEV;
199                         goto error;
200                 }
201                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
202                         (unsigned int)ret);
203         }
204
205         r = 0;
206 error:
207         kfree(p);
208         return r;
209 }
210
211 static u16 get_word(const void *data, u16 offset)
212 {
213         const __le16 *p = data;
214         return le16_to_cpu(p[offset]);
215 }
216
217 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
218                        const char* postfix)
219 {
220         scnprintf(buffer, size, "%s%s",
221                 usb->is_zd1211b ?
222                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
223                 postfix);
224         return buffer;
225 }
226
227 static int handle_version_mismatch(struct zd_usb *usb,
228         const struct firmware *ub_fw)
229 {
230         struct usb_device *udev = zd_usb_to_usbdev(usb);
231         const struct firmware *ur_fw = NULL;
232         int offset;
233         int r = 0;
234         char fw_name[128];
235
236         r = request_fw_file(&ur_fw,
237                 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
238                 &udev->dev);
239         if (r)
240                 goto error;
241
242         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
243         if (r)
244                 goto error;
245
246         offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
247         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
248                 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
249
250         /* At this point, the vendor driver downloads the whole firmware
251          * image, hacks around with version IDs, and uploads it again,
252          * completely overwriting the boot code. We do not do this here as
253          * it is not required on any tested devices, and it is suspected to
254          * cause problems. */
255 error:
256         release_firmware(ur_fw);
257         return r;
258 }
259
260 static int upload_firmware(struct zd_usb *usb)
261 {
262         int r;
263         u16 fw_bcdDevice;
264         u16 bcdDevice;
265         struct usb_device *udev = zd_usb_to_usbdev(usb);
266         const struct firmware *ub_fw = NULL;
267         const struct firmware *uph_fw = NULL;
268         char fw_name[128];
269
270         bcdDevice = get_bcdDevice(udev);
271
272         r = request_fw_file(&ub_fw,
273                 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
274                 &udev->dev);
275         if (r)
276                 goto error;
277
278         fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
279
280         if (fw_bcdDevice != bcdDevice) {
281                 dev_info(&udev->dev,
282                         "firmware version %#06x and device bootcode version "
283                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
284                 if (bcdDevice <= 0x4313)
285                         dev_warn(&udev->dev, "device has old bootcode, please "
286                                 "report success or failure\n");
287
288                 r = handle_version_mismatch(usb, ub_fw);
289                 if (r)
290                         goto error;
291         } else {
292                 dev_dbg_f(&udev->dev,
293                         "firmware device id %#06x is equal to the "
294                         "actual device id\n", fw_bcdDevice);
295         }
296
297
298         r = request_fw_file(&uph_fw,
299                 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
300                 &udev->dev);
301         if (r)
302                 goto error;
303
304         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
305         if (r) {
306                 dev_err(&udev->dev,
307                         "Could not upload firmware code uph. Error number %d\n",
308                         r);
309         }
310
311         /* FALL-THROUGH */
312 error:
313         release_firmware(ub_fw);
314         release_firmware(uph_fw);
315         return r;
316 }
317
318 /* Read data from device address space using "firmware interface" which does
319  * not require firmware to be loaded. */
320 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
321 {
322         int r;
323         struct usb_device *udev = zd_usb_to_usbdev(usb);
324         u8 *buf;
325
326         /* Use "DMA-aware" buffer. */
327         buf = kmalloc(len, GFP_KERNEL);
328         if (!buf)
329                 return -ENOMEM;
330         r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
331                 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
332                 buf, len, 5000);
333         if (r < 0) {
334                 dev_err(&udev->dev,
335                         "read over firmware interface failed: %d\n", r);
336                 goto exit;
337         } else if (r != len) {
338                 dev_err(&udev->dev,
339                         "incomplete read over firmware interface: %d/%d\n",
340                         r, len);
341                 r = -EIO;
342                 goto exit;
343         }
344         r = 0;
345         memcpy(data, buf, len);
346 exit:
347         kfree(buf);
348         return r;
349 }
350
351 #define urb_dev(urb) (&(urb)->dev->dev)
352
353 static inline void handle_regs_int(struct urb *urb)
354 {
355         struct zd_usb *usb = urb->context;
356         struct zd_usb_interrupt *intr = &usb->intr;
357         int len;
358         u16 int_num;
359
360         ZD_ASSERT(in_interrupt());
361         spin_lock(&intr->lock);
362
363         int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
364         if (int_num == CR_INTERRUPT) {
365                 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
366                 memcpy(&mac->intr_buffer, urb->transfer_buffer,
367                                 USB_MAX_EP_INT_BUFFER);
368                 schedule_work(&mac->process_intr);
369         } else if (intr->read_regs_enabled) {
370                 intr->read_regs.length = len = urb->actual_length;
371
372                 if (len > sizeof(intr->read_regs.buffer))
373                         len = sizeof(intr->read_regs.buffer);
374                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
375                 intr->read_regs_enabled = 0;
376                 complete(&intr->read_regs.completion);
377                 goto out;
378         }
379
380 out:
381         spin_unlock(&intr->lock);
382 }
383
384 static void int_urb_complete(struct urb *urb)
385 {
386         int r;
387         struct usb_int_header *hdr;
388
389         switch (urb->status) {
390         case 0:
391                 break;
392         case -ESHUTDOWN:
393         case -EINVAL:
394         case -ENODEV:
395         case -ENOENT:
396         case -ECONNRESET:
397         case -EPIPE:
398                 goto kfree;
399         default:
400                 goto resubmit;
401         }
402
403         if (urb->actual_length < sizeof(hdr)) {
404                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
405                 goto resubmit;
406         }
407
408         hdr = urb->transfer_buffer;
409         if (hdr->type != USB_INT_TYPE) {
410                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
411                 goto resubmit;
412         }
413
414         switch (hdr->id) {
415         case USB_INT_ID_REGS:
416                 handle_regs_int(urb);
417                 break;
418         case USB_INT_ID_RETRY_FAILED:
419                 zd_mac_tx_failed(zd_usb_to_hw(urb->context));
420                 break;
421         default:
422                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
423                         (unsigned int)hdr->id);
424                 goto resubmit;
425         }
426
427 resubmit:
428         r = usb_submit_urb(urb, GFP_ATOMIC);
429         if (r) {
430                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
431                 goto kfree;
432         }
433         return;
434 kfree:
435         kfree(urb->transfer_buffer);
436 }
437
438 static inline int int_urb_interval(struct usb_device *udev)
439 {
440         switch (udev->speed) {
441         case USB_SPEED_HIGH:
442                 return 4;
443         case USB_SPEED_LOW:
444                 return 10;
445         case USB_SPEED_FULL:
446         default:
447                 return 1;
448         }
449 }
450
451 static inline int usb_int_enabled(struct zd_usb *usb)
452 {
453         unsigned long flags;
454         struct zd_usb_interrupt *intr = &usb->intr;
455         struct urb *urb;
456
457         spin_lock_irqsave(&intr->lock, flags);
458         urb = intr->urb;
459         spin_unlock_irqrestore(&intr->lock, flags);
460         return urb != NULL;
461 }
462
463 int zd_usb_enable_int(struct zd_usb *usb)
464 {
465         int r;
466         struct usb_device *udev;
467         struct zd_usb_interrupt *intr = &usb->intr;
468         void *transfer_buffer = NULL;
469         struct urb *urb;
470
471         dev_dbg_f(zd_usb_dev(usb), "\n");
472
473         urb = usb_alloc_urb(0, GFP_KERNEL);
474         if (!urb) {
475                 r = -ENOMEM;
476                 goto out;
477         }
478
479         ZD_ASSERT(!irqs_disabled());
480         spin_lock_irq(&intr->lock);
481         if (intr->urb) {
482                 spin_unlock_irq(&intr->lock);
483                 r = 0;
484                 goto error_free_urb;
485         }
486         intr->urb = urb;
487         spin_unlock_irq(&intr->lock);
488
489         /* TODO: make it a DMA buffer */
490         r = -ENOMEM;
491         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
492         if (!transfer_buffer) {
493                 dev_dbg_f(zd_usb_dev(usb),
494                         "couldn't allocate transfer_buffer\n");
495                 goto error_set_urb_null;
496         }
497
498         udev = zd_usb_to_usbdev(usb);
499         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
500                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
501                          int_urb_complete, usb,
502                          intr->interval);
503
504         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
505         r = usb_submit_urb(urb, GFP_KERNEL);
506         if (r) {
507                 dev_dbg_f(zd_usb_dev(usb),
508                          "Couldn't submit urb. Error number %d\n", r);
509                 goto error;
510         }
511
512         return 0;
513 error:
514         kfree(transfer_buffer);
515 error_set_urb_null:
516         spin_lock_irq(&intr->lock);
517         intr->urb = NULL;
518         spin_unlock_irq(&intr->lock);
519 error_free_urb:
520         usb_free_urb(urb);
521 out:
522         return r;
523 }
524
525 void zd_usb_disable_int(struct zd_usb *usb)
526 {
527         unsigned long flags;
528         struct zd_usb_interrupt *intr = &usb->intr;
529         struct urb *urb;
530
531         spin_lock_irqsave(&intr->lock, flags);
532         urb = intr->urb;
533         if (!urb) {
534                 spin_unlock_irqrestore(&intr->lock, flags);
535                 return;
536         }
537         intr->urb = NULL;
538         spin_unlock_irqrestore(&intr->lock, flags);
539
540         usb_kill_urb(urb);
541         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
542         usb_free_urb(urb);
543 }
544
545 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
546                              unsigned int length)
547 {
548         int i;
549         const struct rx_length_info *length_info;
550
551         if (length < sizeof(struct rx_length_info)) {
552                 /* It's not a complete packet anyhow. */
553                 return;
554         }
555         length_info = (struct rx_length_info *)
556                 (buffer + length - sizeof(struct rx_length_info));
557
558         /* It might be that three frames are merged into a single URB
559          * transaction. We have to check for the length info tag.
560          *
561          * While testing we discovered that length_info might be unaligned,
562          * because if USB transactions are merged, the last packet will not
563          * be padded. Unaligned access might also happen if the length_info
564          * structure is not present.
565          */
566         if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
567         {
568                 unsigned int l, k, n;
569                 for (i = 0, l = 0;; i++) {
570                         k = get_unaligned_le16(&length_info->length[i]);
571                         if (k == 0)
572                                 return;
573                         n = l+k;
574                         if (n > length)
575                                 return;
576                         zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
577                         if (i >= 2)
578                                 return;
579                         l = (n+3) & ~3;
580                 }
581         } else {
582                 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
583         }
584 }
585
586 static void rx_urb_complete(struct urb *urb)
587 {
588         struct zd_usb *usb;
589         struct zd_usb_rx *rx;
590         const u8 *buffer;
591         unsigned int length;
592
593         switch (urb->status) {
594         case 0:
595                 break;
596         case -ESHUTDOWN:
597         case -EINVAL:
598         case -ENODEV:
599         case -ENOENT:
600         case -ECONNRESET:
601         case -EPIPE:
602                 return;
603         default:
604                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
605                 goto resubmit;
606         }
607
608         buffer = urb->transfer_buffer;
609         length = urb->actual_length;
610         usb = urb->context;
611         rx = &usb->rx;
612
613         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
614                 /* If there is an old first fragment, we don't care. */
615                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
616                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
617                 spin_lock(&rx->lock);
618                 memcpy(rx->fragment, buffer, length);
619                 rx->fragment_length = length;
620                 spin_unlock(&rx->lock);
621                 goto resubmit;
622         }
623
624         spin_lock(&rx->lock);
625         if (rx->fragment_length > 0) {
626                 /* We are on a second fragment, we believe */
627                 ZD_ASSERT(length + rx->fragment_length <=
628                           ARRAY_SIZE(rx->fragment));
629                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
630                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
631                 handle_rx_packet(usb, rx->fragment,
632                                  rx->fragment_length + length);
633                 rx->fragment_length = 0;
634                 spin_unlock(&rx->lock);
635         } else {
636                 spin_unlock(&rx->lock);
637                 handle_rx_packet(usb, buffer, length);
638         }
639
640 resubmit:
641         usb_submit_urb(urb, GFP_ATOMIC);
642 }
643
644 static struct urb *alloc_rx_urb(struct zd_usb *usb)
645 {
646         struct usb_device *udev = zd_usb_to_usbdev(usb);
647         struct urb *urb;
648         void *buffer;
649
650         urb = usb_alloc_urb(0, GFP_KERNEL);
651         if (!urb)
652                 return NULL;
653         buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
654                                   &urb->transfer_dma);
655         if (!buffer) {
656                 usb_free_urb(urb);
657                 return NULL;
658         }
659
660         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
661                           buffer, USB_MAX_RX_SIZE,
662                           rx_urb_complete, usb);
663         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
664
665         return urb;
666 }
667
668 static void free_rx_urb(struct urb *urb)
669 {
670         if (!urb)
671                 return;
672         usb_buffer_free(urb->dev, urb->transfer_buffer_length,
673                         urb->transfer_buffer, urb->transfer_dma);
674         usb_free_urb(urb);
675 }
676
677 int zd_usb_enable_rx(struct zd_usb *usb)
678 {
679         int i, r;
680         struct zd_usb_rx *rx = &usb->rx;
681         struct urb **urbs;
682
683         dev_dbg_f(zd_usb_dev(usb), "\n");
684
685         r = -ENOMEM;
686         urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
687         if (!urbs)
688                 goto error;
689         for (i = 0; i < RX_URBS_COUNT; i++) {
690                 urbs[i] = alloc_rx_urb(usb);
691                 if (!urbs[i])
692                         goto error;
693         }
694
695         ZD_ASSERT(!irqs_disabled());
696         spin_lock_irq(&rx->lock);
697         if (rx->urbs) {
698                 spin_unlock_irq(&rx->lock);
699                 r = 0;
700                 goto error;
701         }
702         rx->urbs = urbs;
703         rx->urbs_count = RX_URBS_COUNT;
704         spin_unlock_irq(&rx->lock);
705
706         for (i = 0; i < RX_URBS_COUNT; i++) {
707                 r = usb_submit_urb(urbs[i], GFP_KERNEL);
708                 if (r)
709                         goto error_submit;
710         }
711
712         return 0;
713 error_submit:
714         for (i = 0; i < RX_URBS_COUNT; i++) {
715                 usb_kill_urb(urbs[i]);
716         }
717         spin_lock_irq(&rx->lock);
718         rx->urbs = NULL;
719         rx->urbs_count = 0;
720         spin_unlock_irq(&rx->lock);
721 error:
722         if (urbs) {
723                 for (i = 0; i < RX_URBS_COUNT; i++)
724                         free_rx_urb(urbs[i]);
725         }
726         return r;
727 }
728
729 void zd_usb_disable_rx(struct zd_usb *usb)
730 {
731         int i;
732         unsigned long flags;
733         struct urb **urbs;
734         unsigned int count;
735         struct zd_usb_rx *rx = &usb->rx;
736
737         spin_lock_irqsave(&rx->lock, flags);
738         urbs = rx->urbs;
739         count = rx->urbs_count;
740         spin_unlock_irqrestore(&rx->lock, flags);
741         if (!urbs)
742                 return;
743
744         for (i = 0; i < count; i++) {
745                 usb_kill_urb(urbs[i]);
746                 free_rx_urb(urbs[i]);
747         }
748         kfree(urbs);
749
750         spin_lock_irqsave(&rx->lock, flags);
751         rx->urbs = NULL;
752         rx->urbs_count = 0;
753         spin_unlock_irqrestore(&rx->lock, flags);
754 }
755
756 /**
757  * zd_usb_disable_tx - disable transmission
758  * @usb: the zd1211rw-private USB structure
759  *
760  * Frees all URBs in the free list and marks the transmission as disabled.
761  */
762 void zd_usb_disable_tx(struct zd_usb *usb)
763 {
764         struct zd_usb_tx *tx = &usb->tx;
765         unsigned long flags;
766         struct list_head *pos, *n;
767
768         spin_lock_irqsave(&tx->lock, flags);
769         list_for_each_safe(pos, n, &tx->free_urb_list) {
770                 list_del(pos);
771                 usb_free_urb(list_entry(pos, struct urb, urb_list));
772         }
773         tx->enabled = 0;
774         tx->submitted_urbs = 0;
775         /* The stopped state is ignored, relying on ieee80211_wake_queues()
776          * in a potentionally following zd_usb_enable_tx().
777          */
778         spin_unlock_irqrestore(&tx->lock, flags);
779 }
780
781 /**
782  * zd_usb_enable_tx - enables transmission
783  * @usb: a &struct zd_usb pointer
784  *
785  * This function enables transmission and prepares the &zd_usb_tx data
786  * structure.
787  */
788 void zd_usb_enable_tx(struct zd_usb *usb)
789 {
790         unsigned long flags;
791         struct zd_usb_tx *tx = &usb->tx;
792
793         spin_lock_irqsave(&tx->lock, flags);
794         tx->enabled = 1;
795         tx->submitted_urbs = 0;
796         ieee80211_wake_queues(zd_usb_to_hw(usb));
797         tx->stopped = 0;
798         spin_unlock_irqrestore(&tx->lock, flags);
799 }
800
801 /**
802  * alloc_tx_urb - provides an tx URB
803  * @usb: a &struct zd_usb pointer
804  *
805  * Allocates a new URB. If possible takes the urb from the free list in
806  * usb->tx.
807  */
808 static struct urb *alloc_tx_urb(struct zd_usb *usb)
809 {
810         struct zd_usb_tx *tx = &usb->tx;
811         unsigned long flags;
812         struct list_head *entry;
813         struct urb *urb;
814
815         spin_lock_irqsave(&tx->lock, flags);
816         if (list_empty(&tx->free_urb_list)) {
817                 urb = usb_alloc_urb(0, GFP_ATOMIC);
818                 goto out;
819         }
820         entry = tx->free_urb_list.next;
821         list_del(entry);
822         urb = list_entry(entry, struct urb, urb_list);
823 out:
824         spin_unlock_irqrestore(&tx->lock, flags);
825         return urb;
826 }
827
828 /**
829  * free_tx_urb - frees a used tx URB
830  * @usb: a &struct zd_usb pointer
831  * @urb: URB to be freed
832  *
833  * Frees the the transmission URB, which means to put it on the free URB
834  * list.
835  */
836 static void free_tx_urb(struct zd_usb *usb, struct urb *urb)
837 {
838         struct zd_usb_tx *tx = &usb->tx;
839         unsigned long flags;
840
841         spin_lock_irqsave(&tx->lock, flags);
842         if (!tx->enabled) {
843                 usb_free_urb(urb);
844                 goto out;
845         }
846         list_add(&urb->urb_list, &tx->free_urb_list);
847 out:
848         spin_unlock_irqrestore(&tx->lock, flags);
849 }
850
851 static void tx_dec_submitted_urbs(struct zd_usb *usb)
852 {
853         struct zd_usb_tx *tx = &usb->tx;
854         unsigned long flags;
855
856         spin_lock_irqsave(&tx->lock, flags);
857         --tx->submitted_urbs;
858         if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
859                 ieee80211_wake_queues(zd_usb_to_hw(usb));
860                 tx->stopped = 0;
861         }
862         spin_unlock_irqrestore(&tx->lock, flags);
863 }
864
865 static void tx_inc_submitted_urbs(struct zd_usb *usb)
866 {
867         struct zd_usb_tx *tx = &usb->tx;
868         unsigned long flags;
869
870         spin_lock_irqsave(&tx->lock, flags);
871         ++tx->submitted_urbs;
872         if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
873                 ieee80211_stop_queues(zd_usb_to_hw(usb));
874                 tx->stopped = 1;
875         }
876         spin_unlock_irqrestore(&tx->lock, flags);
877 }
878
879 /**
880  * tx_urb_complete - completes the execution of an URB
881  * @urb: a URB
882  *
883  * This function is called if the URB has been transferred to a device or an
884  * error has happened.
885  */
886 static void tx_urb_complete(struct urb *urb)
887 {
888         int r;
889         struct sk_buff *skb;
890         struct ieee80211_tx_info *info;
891         struct zd_usb *usb;
892
893         switch (urb->status) {
894         case 0:
895                 break;
896         case -ESHUTDOWN:
897         case -EINVAL:
898         case -ENODEV:
899         case -ENOENT:
900         case -ECONNRESET:
901         case -EPIPE:
902                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
903                 break;
904         default:
905                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
906                 goto resubmit;
907         }
908 free_urb:
909         skb = (struct sk_buff *)urb->context;
910         /*
911          * grab 'usb' pointer before handing off the skb (since
912          * it might be freed by zd_mac_tx_to_dev or mac80211)
913          */
914         info = IEEE80211_SKB_CB(skb);
915         usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb;
916         zd_mac_tx_to_dev(skb, urb->status);
917         free_tx_urb(usb, urb);
918         tx_dec_submitted_urbs(usb);
919         return;
920 resubmit:
921         r = usb_submit_urb(urb, GFP_ATOMIC);
922         if (r) {
923                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
924                 goto free_urb;
925         }
926 }
927
928 /**
929  * zd_usb_tx: initiates transfer of a frame of the device
930  *
931  * @usb: the zd1211rw-private USB structure
932  * @skb: a &struct sk_buff pointer
933  *
934  * This function tranmits a frame to the device. It doesn't wait for
935  * completion. The frame must contain the control set and have all the
936  * control set information available.
937  *
938  * The function returns 0 if the transfer has been successfully initiated.
939  */
940 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
941 {
942         int r;
943         struct usb_device *udev = zd_usb_to_usbdev(usb);
944         struct urb *urb;
945
946         urb = alloc_tx_urb(usb);
947         if (!urb) {
948                 r = -ENOMEM;
949                 goto out;
950         }
951
952         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
953                           skb->data, skb->len, tx_urb_complete, skb);
954
955         r = usb_submit_urb(urb, GFP_ATOMIC);
956         if (r)
957                 goto error;
958         tx_inc_submitted_urbs(usb);
959         return 0;
960 error:
961         free_tx_urb(usb, urb);
962 out:
963         return r;
964 }
965
966 static inline void init_usb_interrupt(struct zd_usb *usb)
967 {
968         struct zd_usb_interrupt *intr = &usb->intr;
969
970         spin_lock_init(&intr->lock);
971         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
972         init_completion(&intr->read_regs.completion);
973         intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
974 }
975
976 static inline void init_usb_rx(struct zd_usb *usb)
977 {
978         struct zd_usb_rx *rx = &usb->rx;
979         spin_lock_init(&rx->lock);
980         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
981                 rx->usb_packet_size = 512;
982         } else {
983                 rx->usb_packet_size = 64;
984         }
985         ZD_ASSERT(rx->fragment_length == 0);
986 }
987
988 static inline void init_usb_tx(struct zd_usb *usb)
989 {
990         struct zd_usb_tx *tx = &usb->tx;
991         spin_lock_init(&tx->lock);
992         tx->enabled = 0;
993         tx->stopped = 0;
994         INIT_LIST_HEAD(&tx->free_urb_list);
995         tx->submitted_urbs = 0;
996 }
997
998 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
999                  struct usb_interface *intf)
1000 {
1001         memset(usb, 0, sizeof(*usb));
1002         usb->intf = usb_get_intf(intf);
1003         usb_set_intfdata(usb->intf, hw);
1004         init_usb_interrupt(usb);
1005         init_usb_tx(usb);
1006         init_usb_rx(usb);
1007 }
1008
1009 void zd_usb_clear(struct zd_usb *usb)
1010 {
1011         usb_set_intfdata(usb->intf, NULL);
1012         usb_put_intf(usb->intf);
1013         ZD_MEMCLEAR(usb, sizeof(*usb));
1014         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
1015 }
1016
1017 static const char *speed(enum usb_device_speed speed)
1018 {
1019         switch (speed) {
1020         case USB_SPEED_LOW:
1021                 return "low";
1022         case USB_SPEED_FULL:
1023                 return "full";
1024         case USB_SPEED_HIGH:
1025                 return "high";
1026         default:
1027                 return "unknown speed";
1028         }
1029 }
1030
1031 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1032 {
1033         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1034                 le16_to_cpu(udev->descriptor.idVendor),
1035                 le16_to_cpu(udev->descriptor.idProduct),
1036                 get_bcdDevice(udev),
1037                 speed(udev->speed));
1038 }
1039
1040 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1041 {
1042         struct usb_device *udev = interface_to_usbdev(usb->intf);
1043         return scnprint_id(udev, buffer, size);
1044 }
1045
1046 #ifdef DEBUG
1047 static void print_id(struct usb_device *udev)
1048 {
1049         char buffer[40];
1050
1051         scnprint_id(udev, buffer, sizeof(buffer));
1052         buffer[sizeof(buffer)-1] = 0;
1053         dev_dbg_f(&udev->dev, "%s\n", buffer);
1054 }
1055 #else
1056 #define print_id(udev) do { } while (0)
1057 #endif
1058
1059 static int eject_installer(struct usb_interface *intf)
1060 {
1061         struct usb_device *udev = interface_to_usbdev(intf);
1062         struct usb_host_interface *iface_desc = &intf->altsetting[0];
1063         struct usb_endpoint_descriptor *endpoint;
1064         unsigned char *cmd;
1065         u8 bulk_out_ep;
1066         int r;
1067
1068         /* Find bulk out endpoint */
1069         endpoint = &iface_desc->endpoint[1].desc;
1070         if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
1071             usb_endpoint_xfer_bulk(endpoint)) {
1072                 bulk_out_ep = endpoint->bEndpointAddress;
1073         } else {
1074                 dev_err(&udev->dev,
1075                         "zd1211rw: Could not find bulk out endpoint\n");
1076                 return -ENODEV;
1077         }
1078
1079         cmd = kzalloc(31, GFP_KERNEL);
1080         if (cmd == NULL)
1081                 return -ENODEV;
1082
1083         /* USB bulk command block */
1084         cmd[0] = 0x55;  /* bulk command signature */
1085         cmd[1] = 0x53;  /* bulk command signature */
1086         cmd[2] = 0x42;  /* bulk command signature */
1087         cmd[3] = 0x43;  /* bulk command signature */
1088         cmd[14] = 6;    /* command length */
1089
1090         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1091         cmd[19] = 0x2;  /* eject disc */
1092
1093         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1094         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1095                 cmd, 31, NULL, 2000);
1096         kfree(cmd);
1097         if (r)
1098                 return r;
1099
1100         /* At this point, the device disconnects and reconnects with the real
1101          * ID numbers. */
1102
1103         usb_set_intfdata(intf, NULL);
1104         return 0;
1105 }
1106
1107 int zd_usb_init_hw(struct zd_usb *usb)
1108 {
1109         int r;
1110         struct zd_mac *mac = zd_usb_to_mac(usb);
1111
1112         dev_dbg_f(zd_usb_dev(usb), "\n");
1113
1114         r = upload_firmware(usb);
1115         if (r) {
1116                 dev_err(zd_usb_dev(usb),
1117                        "couldn't load firmware. Error number %d\n", r);
1118                 return r;
1119         }
1120
1121         r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1122         if (r) {
1123                 dev_dbg_f(zd_usb_dev(usb),
1124                         "couldn't reset configuration. Error number %d\n", r);
1125                 return r;
1126         }
1127
1128         r = zd_mac_init_hw(mac->hw);
1129         if (r) {
1130                 dev_dbg_f(zd_usb_dev(usb),
1131                          "couldn't initialize mac. Error number %d\n", r);
1132                 return r;
1133         }
1134
1135         usb->initialized = 1;
1136         return 0;
1137 }
1138
1139 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1140 {
1141         int r;
1142         struct usb_device *udev = interface_to_usbdev(intf);
1143         struct zd_usb *usb;
1144         struct ieee80211_hw *hw = NULL;
1145
1146         print_id(udev);
1147
1148         if (id->driver_info & DEVICE_INSTALLER)
1149                 return eject_installer(intf);
1150
1151         switch (udev->speed) {
1152         case USB_SPEED_LOW:
1153         case USB_SPEED_FULL:
1154         case USB_SPEED_HIGH:
1155                 break;
1156         default:
1157                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1158                 r = -ENODEV;
1159                 goto error;
1160         }
1161
1162         r = usb_reset_device(udev);
1163         if (r) {
1164                 dev_err(&intf->dev,
1165                         "couldn't reset usb device. Error number %d\n", r);
1166                 goto error;
1167         }
1168
1169         hw = zd_mac_alloc_hw(intf);
1170         if (hw == NULL) {
1171                 r = -ENOMEM;
1172                 goto error;
1173         }
1174
1175         usb = &zd_hw_mac(hw)->chip.usb;
1176         usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1177
1178         r = zd_mac_preinit_hw(hw);
1179         if (r) {
1180                 dev_dbg_f(&intf->dev,
1181                          "couldn't initialize mac. Error number %d\n", r);
1182                 goto error;
1183         }
1184
1185         r = ieee80211_register_hw(hw);
1186         if (r) {
1187                 dev_dbg_f(&intf->dev,
1188                          "couldn't register device. Error number %d\n", r);
1189                 goto error;
1190         }
1191
1192         dev_dbg_f(&intf->dev, "successful\n");
1193         dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
1194         return 0;
1195 error:
1196         usb_reset_device(interface_to_usbdev(intf));
1197         if (hw) {
1198                 zd_mac_clear(zd_hw_mac(hw));
1199                 ieee80211_free_hw(hw);
1200         }
1201         return r;
1202 }
1203
1204 static void disconnect(struct usb_interface *intf)
1205 {
1206         struct ieee80211_hw *hw = zd_intf_to_hw(intf);
1207         struct zd_mac *mac;
1208         struct zd_usb *usb;
1209
1210         /* Either something really bad happened, or we're just dealing with
1211          * a DEVICE_INSTALLER. */
1212         if (hw == NULL)
1213                 return;
1214
1215         mac = zd_hw_mac(hw);
1216         usb = &mac->chip.usb;
1217
1218         dev_dbg_f(zd_usb_dev(usb), "\n");
1219
1220         ieee80211_unregister_hw(hw);
1221
1222         /* Just in case something has gone wrong! */
1223         zd_usb_disable_rx(usb);
1224         zd_usb_disable_int(usb);
1225
1226         /* If the disconnect has been caused by a removal of the
1227          * driver module, the reset allows reloading of the driver. If the
1228          * reset will not be executed here, the upload of the firmware in the
1229          * probe function caused by the reloading of the driver will fail.
1230          */
1231         usb_reset_device(interface_to_usbdev(intf));
1232
1233         zd_mac_clear(mac);
1234         ieee80211_free_hw(hw);
1235         dev_dbg(&intf->dev, "disconnected\n");
1236 }
1237
1238 static struct usb_driver driver = {
1239         .name           = KBUILD_MODNAME,
1240         .id_table       = usb_ids,
1241         .probe          = probe,
1242         .disconnect     = disconnect,
1243 };
1244
1245 struct workqueue_struct *zd_workqueue;
1246
1247 static int __init usb_init(void)
1248 {
1249         int r;
1250
1251         pr_debug("%s usb_init()\n", driver.name);
1252
1253         zd_workqueue = create_singlethread_workqueue(driver.name);
1254         if (zd_workqueue == NULL) {
1255                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1256                 return -ENOMEM;
1257         }
1258
1259         r = usb_register(&driver);
1260         if (r) {
1261                 destroy_workqueue(zd_workqueue);
1262                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1263                        driver.name, r);
1264                 return r;
1265         }
1266
1267         pr_debug("%s initialized\n", driver.name);
1268         return 0;
1269 }
1270
1271 static void __exit usb_exit(void)
1272 {
1273         pr_debug("%s usb_exit()\n", driver.name);
1274         usb_deregister(&driver);
1275         destroy_workqueue(zd_workqueue);
1276 }
1277
1278 module_init(usb_init);
1279 module_exit(usb_exit);
1280
1281 static int usb_int_regs_length(unsigned int count)
1282 {
1283         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1284 }
1285
1286 static void prepare_read_regs_int(struct zd_usb *usb)
1287 {
1288         struct zd_usb_interrupt *intr = &usb->intr;
1289
1290         spin_lock_irq(&intr->lock);
1291         intr->read_regs_enabled = 1;
1292         INIT_COMPLETION(intr->read_regs.completion);
1293         spin_unlock_irq(&intr->lock);
1294 }
1295
1296 static void disable_read_regs_int(struct zd_usb *usb)
1297 {
1298         struct zd_usb_interrupt *intr = &usb->intr;
1299
1300         spin_lock_irq(&intr->lock);
1301         intr->read_regs_enabled = 0;
1302         spin_unlock_irq(&intr->lock);
1303 }
1304
1305 static int get_results(struct zd_usb *usb, u16 *values,
1306                        struct usb_req_read_regs *req, unsigned int count)
1307 {
1308         int r;
1309         int i;
1310         struct zd_usb_interrupt *intr = &usb->intr;
1311         struct read_regs_int *rr = &intr->read_regs;
1312         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1313
1314         spin_lock_irq(&intr->lock);
1315
1316         r = -EIO;
1317         /* The created block size seems to be larger than expected.
1318          * However results appear to be correct.
1319          */
1320         if (rr->length < usb_int_regs_length(count)) {
1321                 dev_dbg_f(zd_usb_dev(usb),
1322                          "error: actual length %d less than expected %d\n",
1323                          rr->length, usb_int_regs_length(count));
1324                 goto error_unlock;
1325         }
1326         if (rr->length > sizeof(rr->buffer)) {
1327                 dev_dbg_f(zd_usb_dev(usb),
1328                          "error: actual length %d exceeds buffer size %zu\n",
1329                          rr->length, sizeof(rr->buffer));
1330                 goto error_unlock;
1331         }
1332
1333         for (i = 0; i < count; i++) {
1334                 struct reg_data *rd = &regs->regs[i];
1335                 if (rd->addr != req->addr[i]) {
1336                         dev_dbg_f(zd_usb_dev(usb),
1337                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1338                                  le16_to_cpu(rd->addr),
1339                                  le16_to_cpu(req->addr[i]));
1340                         goto error_unlock;
1341                 }
1342                 values[i] = le16_to_cpu(rd->value);
1343         }
1344
1345         r = 0;
1346 error_unlock:
1347         spin_unlock_irq(&intr->lock);
1348         return r;
1349 }
1350
1351 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1352                      const zd_addr_t *addresses, unsigned int count)
1353 {
1354         int r;
1355         int i, req_len, actual_req_len;
1356         struct usb_device *udev;
1357         struct usb_req_read_regs *req = NULL;
1358         unsigned long timeout;
1359
1360         if (count < 1) {
1361                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1362                 return -EINVAL;
1363         }
1364         if (count > USB_MAX_IOREAD16_COUNT) {
1365                 dev_dbg_f(zd_usb_dev(usb),
1366                          "error: count %u exceeds possible max %u\n",
1367                          count, USB_MAX_IOREAD16_COUNT);
1368                 return -EINVAL;
1369         }
1370         if (in_atomic()) {
1371                 dev_dbg_f(zd_usb_dev(usb),
1372                          "error: io in atomic context not supported\n");
1373                 return -EWOULDBLOCK;
1374         }
1375         if (!usb_int_enabled(usb)) {
1376                  dev_dbg_f(zd_usb_dev(usb),
1377                           "error: usb interrupt not enabled\n");
1378                 return -EWOULDBLOCK;
1379         }
1380
1381         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1382         req = kmalloc(req_len, GFP_KERNEL);
1383         if (!req)
1384                 return -ENOMEM;
1385         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1386         for (i = 0; i < count; i++)
1387                 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1388
1389         udev = zd_usb_to_usbdev(usb);
1390         prepare_read_regs_int(usb);
1391         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1392                          req, req_len, &actual_req_len, 1000 /* ms */);
1393         if (r) {
1394                 dev_dbg_f(zd_usb_dev(usb),
1395                         "error in usb_bulk_msg(). Error number %d\n", r);
1396                 goto error;
1397         }
1398         if (req_len != actual_req_len) {
1399                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1400                         " req_len %d != actual_req_len %d\n",
1401                         req_len, actual_req_len);
1402                 r = -EIO;
1403                 goto error;
1404         }
1405
1406         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1407                                               msecs_to_jiffies(1000));
1408         if (!timeout) {
1409                 disable_read_regs_int(usb);
1410                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1411                 r = -ETIMEDOUT;
1412                 goto error;
1413         }
1414
1415         r = get_results(usb, values, req, count);
1416 error:
1417         kfree(req);
1418         return r;
1419 }
1420
1421 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1422                       unsigned int count)
1423 {
1424         int r;
1425         struct usb_device *udev;
1426         struct usb_req_write_regs *req = NULL;
1427         int i, req_len, actual_req_len;
1428
1429         if (count == 0)
1430                 return 0;
1431         if (count > USB_MAX_IOWRITE16_COUNT) {
1432                 dev_dbg_f(zd_usb_dev(usb),
1433                         "error: count %u exceeds possible max %u\n",
1434                         count, USB_MAX_IOWRITE16_COUNT);
1435                 return -EINVAL;
1436         }
1437         if (in_atomic()) {
1438                 dev_dbg_f(zd_usb_dev(usb),
1439                         "error: io in atomic context not supported\n");
1440                 return -EWOULDBLOCK;
1441         }
1442
1443         req_len = sizeof(struct usb_req_write_regs) +
1444                   count * sizeof(struct reg_data);
1445         req = kmalloc(req_len, GFP_KERNEL);
1446         if (!req)
1447                 return -ENOMEM;
1448
1449         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1450         for (i = 0; i < count; i++) {
1451                 struct reg_data *rw  = &req->reg_writes[i];
1452                 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1453                 rw->value = cpu_to_le16(ioreqs[i].value);
1454         }
1455
1456         udev = zd_usb_to_usbdev(usb);
1457         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1458                          req, req_len, &actual_req_len, 1000 /* ms */);
1459         if (r) {
1460                 dev_dbg_f(zd_usb_dev(usb),
1461                         "error in usb_bulk_msg(). Error number %d\n", r);
1462                 goto error;
1463         }
1464         if (req_len != actual_req_len) {
1465                 dev_dbg_f(zd_usb_dev(usb),
1466                         "error in usb_bulk_msg()"
1467                         " req_len %d != actual_req_len %d\n",
1468                         req_len, actual_req_len);
1469                 r = -EIO;
1470                 goto error;
1471         }
1472
1473         /* FALL-THROUGH with r == 0 */
1474 error:
1475         kfree(req);
1476         return r;
1477 }
1478
1479 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1480 {
1481         int r;
1482         struct usb_device *udev;
1483         struct usb_req_rfwrite *req = NULL;
1484         int i, req_len, actual_req_len;
1485         u16 bit_value_template;
1486
1487         if (in_atomic()) {
1488                 dev_dbg_f(zd_usb_dev(usb),
1489                         "error: io in atomic context not supported\n");
1490                 return -EWOULDBLOCK;
1491         }
1492         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1493                 dev_dbg_f(zd_usb_dev(usb),
1494                         "error: bits %d are smaller than"
1495                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1496                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1497                 return -EINVAL;
1498         }
1499         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1500                 dev_dbg_f(zd_usb_dev(usb),
1501                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1502                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1503                 return -EINVAL;
1504         }
1505 #ifdef DEBUG
1506         if (value & (~0UL << bits)) {
1507                 dev_dbg_f(zd_usb_dev(usb),
1508                         "error: value %#09x has bits >= %d set\n",
1509                         value, bits);
1510                 return -EINVAL;
1511         }
1512 #endif /* DEBUG */
1513
1514         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1515
1516         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1517         if (r) {
1518                 dev_dbg_f(zd_usb_dev(usb),
1519                         "error %d: Couldn't read CR203\n", r);
1520                 goto out;
1521         }
1522         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1523
1524         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1525         req = kmalloc(req_len, GFP_KERNEL);
1526         if (!req)
1527                 return -ENOMEM;
1528
1529         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1530         /* 1: 3683a, but not used in ZYDAS driver */
1531         req->value = cpu_to_le16(2);
1532         req->bits = cpu_to_le16(bits);
1533
1534         for (i = 0; i < bits; i++) {
1535                 u16 bv = bit_value_template;
1536                 if (value & (1 << (bits-1-i)))
1537                         bv |= RF_DATA;
1538                 req->bit_values[i] = cpu_to_le16(bv);
1539         }
1540
1541         udev = zd_usb_to_usbdev(usb);
1542         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1543                          req, req_len, &actual_req_len, 1000 /* ms */);
1544         if (r) {
1545                 dev_dbg_f(zd_usb_dev(usb),
1546                         "error in usb_bulk_msg(). Error number %d\n", r);
1547                 goto out;
1548         }
1549         if (req_len != actual_req_len) {
1550                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1551                         " req_len %d != actual_req_len %d\n",
1552                         req_len, actual_req_len);
1553                 r = -EIO;
1554                 goto out;
1555         }
1556
1557         /* FALL-THROUGH with r == 0 */
1558 out:
1559         kfree(req);
1560         return r;
1561 }