USB: rename usb_buffer_alloc() and usb_buffer_free() users
[linux-2.6.git] / 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/slab.h>
28 #include <linux/skbuff.h>
29 #include <linux/usb.h>
30 #include <linux/workqueue.h>
31 #include <net/mac80211.h>
32 #include <asm/unaligned.h>
33
34 #include "zd_def.h"
35 #include "zd_mac.h"
36 #include "zd_usb.h"
37
38 static struct usb_device_id usb_ids[] = {
39         /* ZD1211 */
40         { USB_DEVICE(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 },
41         { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
42         { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
43         { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
44         { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
45         { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
46         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
47         { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
48         { USB_DEVICE(0x0ace, 0xa211), .driver_info = DEVICE_ZD1211 },
49         { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
50         { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
51         { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
52         { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
53         { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
54         { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
55         { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 },
56         { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
57         { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
58         { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
59         { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
60         { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
61         { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
62         { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
63         { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
64         /* ZD1211B */
65         { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
66         { USB_DEVICE(0x0409, 0x0248), .driver_info = DEVICE_ZD1211B },
67         { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
68         { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
69         { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
70         { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
71         { USB_DEVICE(0x054c, 0x0257), .driver_info = DEVICE_ZD1211B },
72         { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
73         { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
74         { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
75         { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
76         { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
77         { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
78         { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211B },
79         { USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B },
80         { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
81         { USB_DEVICE(0x083a, 0xe501), .driver_info = DEVICE_ZD1211B },
82         { USB_DEVICE(0x083a, 0xe503), .driver_info = DEVICE_ZD1211B },
83         { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
84         { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
85         { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B },
86         { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
87         { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
88         { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
89         { USB_DEVICE(0x0df6, 0x0036), .driver_info = DEVICE_ZD1211B },
90         { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
91         { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
92         { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
93         { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
94         { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
95         /* "Driverless" devices that need ejecting */
96         { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
97         { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
98         {}
99 };
100
101 MODULE_LICENSE("GPL");
102 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
103 MODULE_AUTHOR("Ulrich Kunitz");
104 MODULE_AUTHOR("Daniel Drake");
105 MODULE_VERSION("1.0");
106 MODULE_DEVICE_TABLE(usb, usb_ids);
107
108 #define FW_ZD1211_PREFIX        "zd1211/zd1211_"
109 #define FW_ZD1211B_PREFIX       "zd1211/zd1211b_"
110
111 /* USB device initialization */
112 static void int_urb_complete(struct urb *urb);
113
114 static int request_fw_file(
115         const struct firmware **fw, const char *name, struct device *device)
116 {
117         int r;
118
119         dev_dbg_f(device, "fw name %s\n", name);
120
121         r = request_firmware(fw, name, device);
122         if (r)
123                 dev_err(device,
124                        "Could not load firmware file %s. Error number %d\n",
125                        name, r);
126         return r;
127 }
128
129 static inline u16 get_bcdDevice(const struct usb_device *udev)
130 {
131         return le16_to_cpu(udev->descriptor.bcdDevice);
132 }
133
134 enum upload_code_flags {
135         REBOOT = 1,
136 };
137
138 /* Ensures that MAX_TRANSFER_SIZE is even. */
139 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
140
141 static int upload_code(struct usb_device *udev,
142         const u8 *data, size_t size, u16 code_offset, int flags)
143 {
144         u8 *p;
145         int r;
146
147         /* USB request blocks need "kmalloced" buffers.
148          */
149         p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
150         if (!p) {
151                 dev_err(&udev->dev, "out of memory\n");
152                 r = -ENOMEM;
153                 goto error;
154         }
155
156         size &= ~1;
157         while (size > 0) {
158                 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
159                         size : MAX_TRANSFER_SIZE;
160
161                 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
162
163                 memcpy(p, data, transfer_size);
164                 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
165                         USB_REQ_FIRMWARE_DOWNLOAD,
166                         USB_DIR_OUT | USB_TYPE_VENDOR,
167                         code_offset, 0, p, transfer_size, 1000 /* ms */);
168                 if (r < 0) {
169                         dev_err(&udev->dev,
170                                "USB control request for firmware upload"
171                                " failed. Error number %d\n", r);
172                         goto error;
173                 }
174                 transfer_size = r & ~1;
175
176                 size -= transfer_size;
177                 data += transfer_size;
178                 code_offset += transfer_size/sizeof(u16);
179         }
180
181         if (flags & REBOOT) {
182                 u8 ret;
183
184                 /* Use "DMA-aware" buffer. */
185                 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
186                         USB_REQ_FIRMWARE_CONFIRM,
187                         USB_DIR_IN | USB_TYPE_VENDOR,
188                         0, 0, p, sizeof(ret), 5000 /* ms */);
189                 if (r != sizeof(ret)) {
190                         dev_err(&udev->dev,
191                                 "control request firmeware confirmation failed."
192                                 " Return value %d\n", r);
193                         if (r >= 0)
194                                 r = -ENODEV;
195                         goto error;
196                 }
197                 ret = p[0];
198                 if (ret & 0x80) {
199                         dev_err(&udev->dev,
200                                 "Internal error while downloading."
201                                 " Firmware confirm return value %#04x\n",
202                                 (unsigned int)ret);
203                         r = -ENODEV;
204                         goto error;
205                 }
206                 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
207                         (unsigned int)ret);
208         }
209
210         r = 0;
211 error:
212         kfree(p);
213         return r;
214 }
215
216 static u16 get_word(const void *data, u16 offset)
217 {
218         const __le16 *p = data;
219         return le16_to_cpu(p[offset]);
220 }
221
222 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
223                        const char* postfix)
224 {
225         scnprintf(buffer, size, "%s%s",
226                 usb->is_zd1211b ?
227                         FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
228                 postfix);
229         return buffer;
230 }
231
232 static int handle_version_mismatch(struct zd_usb *usb,
233         const struct firmware *ub_fw)
234 {
235         struct usb_device *udev = zd_usb_to_usbdev(usb);
236         const struct firmware *ur_fw = NULL;
237         int offset;
238         int r = 0;
239         char fw_name[128];
240
241         r = request_fw_file(&ur_fw,
242                 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
243                 &udev->dev);
244         if (r)
245                 goto error;
246
247         r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
248         if (r)
249                 goto error;
250
251         offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
252         r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
253                 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
254
255         /* At this point, the vendor driver downloads the whole firmware
256          * image, hacks around with version IDs, and uploads it again,
257          * completely overwriting the boot code. We do not do this here as
258          * it is not required on any tested devices, and it is suspected to
259          * cause problems. */
260 error:
261         release_firmware(ur_fw);
262         return r;
263 }
264
265 static int upload_firmware(struct zd_usb *usb)
266 {
267         int r;
268         u16 fw_bcdDevice;
269         u16 bcdDevice;
270         struct usb_device *udev = zd_usb_to_usbdev(usb);
271         const struct firmware *ub_fw = NULL;
272         const struct firmware *uph_fw = NULL;
273         char fw_name[128];
274
275         bcdDevice = get_bcdDevice(udev);
276
277         r = request_fw_file(&ub_fw,
278                 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
279                 &udev->dev);
280         if (r)
281                 goto error;
282
283         fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
284
285         if (fw_bcdDevice != bcdDevice) {
286                 dev_info(&udev->dev,
287                         "firmware version %#06x and device bootcode version "
288                         "%#06x differ\n", fw_bcdDevice, bcdDevice);
289                 if (bcdDevice <= 0x4313)
290                         dev_warn(&udev->dev, "device has old bootcode, please "
291                                 "report success or failure\n");
292
293                 r = handle_version_mismatch(usb, ub_fw);
294                 if (r)
295                         goto error;
296         } else {
297                 dev_dbg_f(&udev->dev,
298                         "firmware device id %#06x is equal to the "
299                         "actual device id\n", fw_bcdDevice);
300         }
301
302
303         r = request_fw_file(&uph_fw,
304                 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
305                 &udev->dev);
306         if (r)
307                 goto error;
308
309         r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
310         if (r) {
311                 dev_err(&udev->dev,
312                         "Could not upload firmware code uph. Error number %d\n",
313                         r);
314         }
315
316         /* FALL-THROUGH */
317 error:
318         release_firmware(ub_fw);
319         release_firmware(uph_fw);
320         return r;
321 }
322
323 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ur");
324 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ur");
325 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ub");
326 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ub");
327 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "uphr");
328 MODULE_FIRMWARE(FW_ZD1211_PREFIX "uphr");
329
330 /* Read data from device address space using "firmware interface" which does
331  * not require firmware to be loaded. */
332 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
333 {
334         int r;
335         struct usb_device *udev = zd_usb_to_usbdev(usb);
336         u8 *buf;
337
338         /* Use "DMA-aware" buffer. */
339         buf = kmalloc(len, GFP_KERNEL);
340         if (!buf)
341                 return -ENOMEM;
342         r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
343                 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
344                 buf, len, 5000);
345         if (r < 0) {
346                 dev_err(&udev->dev,
347                         "read over firmware interface failed: %d\n", r);
348                 goto exit;
349         } else if (r != len) {
350                 dev_err(&udev->dev,
351                         "incomplete read over firmware interface: %d/%d\n",
352                         r, len);
353                 r = -EIO;
354                 goto exit;
355         }
356         r = 0;
357         memcpy(data, buf, len);
358 exit:
359         kfree(buf);
360         return r;
361 }
362
363 #define urb_dev(urb) (&(urb)->dev->dev)
364
365 static inline void handle_regs_int(struct urb *urb)
366 {
367         struct zd_usb *usb = urb->context;
368         struct zd_usb_interrupt *intr = &usb->intr;
369         int len;
370         u16 int_num;
371
372         ZD_ASSERT(in_interrupt());
373         spin_lock(&intr->lock);
374
375         int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
376         if (int_num == CR_INTERRUPT) {
377                 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
378                 memcpy(&mac->intr_buffer, urb->transfer_buffer,
379                                 USB_MAX_EP_INT_BUFFER);
380                 schedule_work(&mac->process_intr);
381         } else if (intr->read_regs_enabled) {
382                 intr->read_regs.length = len = urb->actual_length;
383
384                 if (len > sizeof(intr->read_regs.buffer))
385                         len = sizeof(intr->read_regs.buffer);
386                 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
387                 intr->read_regs_enabled = 0;
388                 complete(&intr->read_regs.completion);
389                 goto out;
390         }
391
392 out:
393         spin_unlock(&intr->lock);
394 }
395
396 static void int_urb_complete(struct urb *urb)
397 {
398         int r;
399         struct usb_int_header *hdr;
400
401         switch (urb->status) {
402         case 0:
403                 break;
404         case -ESHUTDOWN:
405         case -EINVAL:
406         case -ENODEV:
407         case -ENOENT:
408         case -ECONNRESET:
409         case -EPIPE:
410                 goto kfree;
411         default:
412                 goto resubmit;
413         }
414
415         if (urb->actual_length < sizeof(hdr)) {
416                 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
417                 goto resubmit;
418         }
419
420         hdr = urb->transfer_buffer;
421         if (hdr->type != USB_INT_TYPE) {
422                 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
423                 goto resubmit;
424         }
425
426         switch (hdr->id) {
427         case USB_INT_ID_REGS:
428                 handle_regs_int(urb);
429                 break;
430         case USB_INT_ID_RETRY_FAILED:
431                 zd_mac_tx_failed(urb);
432                 break;
433         default:
434                 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
435                         (unsigned int)hdr->id);
436                 goto resubmit;
437         }
438
439 resubmit:
440         r = usb_submit_urb(urb, GFP_ATOMIC);
441         if (r) {
442                 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
443                 goto kfree;
444         }
445         return;
446 kfree:
447         kfree(urb->transfer_buffer);
448 }
449
450 static inline int int_urb_interval(struct usb_device *udev)
451 {
452         switch (udev->speed) {
453         case USB_SPEED_HIGH:
454                 return 4;
455         case USB_SPEED_LOW:
456                 return 10;
457         case USB_SPEED_FULL:
458         default:
459                 return 1;
460         }
461 }
462
463 static inline int usb_int_enabled(struct zd_usb *usb)
464 {
465         unsigned long flags;
466         struct zd_usb_interrupt *intr = &usb->intr;
467         struct urb *urb;
468
469         spin_lock_irqsave(&intr->lock, flags);
470         urb = intr->urb;
471         spin_unlock_irqrestore(&intr->lock, flags);
472         return urb != NULL;
473 }
474
475 int zd_usb_enable_int(struct zd_usb *usb)
476 {
477         int r;
478         struct usb_device *udev;
479         struct zd_usb_interrupt *intr = &usb->intr;
480         void *transfer_buffer = NULL;
481         struct urb *urb;
482
483         dev_dbg_f(zd_usb_dev(usb), "\n");
484
485         urb = usb_alloc_urb(0, GFP_KERNEL);
486         if (!urb) {
487                 r = -ENOMEM;
488                 goto out;
489         }
490
491         ZD_ASSERT(!irqs_disabled());
492         spin_lock_irq(&intr->lock);
493         if (intr->urb) {
494                 spin_unlock_irq(&intr->lock);
495                 r = 0;
496                 goto error_free_urb;
497         }
498         intr->urb = urb;
499         spin_unlock_irq(&intr->lock);
500
501         /* TODO: make it a DMA buffer */
502         r = -ENOMEM;
503         transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
504         if (!transfer_buffer) {
505                 dev_dbg_f(zd_usb_dev(usb),
506                         "couldn't allocate transfer_buffer\n");
507                 goto error_set_urb_null;
508         }
509
510         udev = zd_usb_to_usbdev(usb);
511         usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
512                          transfer_buffer, USB_MAX_EP_INT_BUFFER,
513                          int_urb_complete, usb,
514                          intr->interval);
515
516         dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
517         r = usb_submit_urb(urb, GFP_KERNEL);
518         if (r) {
519                 dev_dbg_f(zd_usb_dev(usb),
520                          "Couldn't submit urb. Error number %d\n", r);
521                 goto error;
522         }
523
524         return 0;
525 error:
526         kfree(transfer_buffer);
527 error_set_urb_null:
528         spin_lock_irq(&intr->lock);
529         intr->urb = NULL;
530         spin_unlock_irq(&intr->lock);
531 error_free_urb:
532         usb_free_urb(urb);
533 out:
534         return r;
535 }
536
537 void zd_usb_disable_int(struct zd_usb *usb)
538 {
539         unsigned long flags;
540         struct zd_usb_interrupt *intr = &usb->intr;
541         struct urb *urb;
542
543         spin_lock_irqsave(&intr->lock, flags);
544         urb = intr->urb;
545         if (!urb) {
546                 spin_unlock_irqrestore(&intr->lock, flags);
547                 return;
548         }
549         intr->urb = NULL;
550         spin_unlock_irqrestore(&intr->lock, flags);
551
552         usb_kill_urb(urb);
553         dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
554         usb_free_urb(urb);
555 }
556
557 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
558                              unsigned int length)
559 {
560         int i;
561         const struct rx_length_info *length_info;
562
563         if (length < sizeof(struct rx_length_info)) {
564                 /* It's not a complete packet anyhow. */
565                 printk("%s: invalid, small RX packet : %d\n",
566                        __func__, length);
567                 return;
568         }
569         length_info = (struct rx_length_info *)
570                 (buffer + length - sizeof(struct rx_length_info));
571
572         /* It might be that three frames are merged into a single URB
573          * transaction. We have to check for the length info tag.
574          *
575          * While testing we discovered that length_info might be unaligned,
576          * because if USB transactions are merged, the last packet will not
577          * be padded. Unaligned access might also happen if the length_info
578          * structure is not present.
579          */
580         if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
581         {
582                 unsigned int l, k, n;
583                 for (i = 0, l = 0;; i++) {
584                         k = get_unaligned_le16(&length_info->length[i]);
585                         if (k == 0)
586                                 return;
587                         n = l+k;
588                         if (n > length)
589                                 return;
590                         zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
591                         if (i >= 2)
592                                 return;
593                         l = (n+3) & ~3;
594                 }
595         } else {
596                 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
597         }
598 }
599
600 static void rx_urb_complete(struct urb *urb)
601 {
602         struct zd_usb *usb;
603         struct zd_usb_rx *rx;
604         const u8 *buffer;
605         unsigned int length;
606
607         switch (urb->status) {
608         case 0:
609                 break;
610         case -ESHUTDOWN:
611         case -EINVAL:
612         case -ENODEV:
613         case -ENOENT:
614         case -ECONNRESET:
615         case -EPIPE:
616                 return;
617         default:
618                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
619                 goto resubmit;
620         }
621
622         buffer = urb->transfer_buffer;
623         length = urb->actual_length;
624         usb = urb->context;
625         rx = &usb->rx;
626
627         if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
628                 /* If there is an old first fragment, we don't care. */
629                 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
630                 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
631                 spin_lock(&rx->lock);
632                 memcpy(rx->fragment, buffer, length);
633                 rx->fragment_length = length;
634                 spin_unlock(&rx->lock);
635                 goto resubmit;
636         }
637
638         spin_lock(&rx->lock);
639         if (rx->fragment_length > 0) {
640                 /* We are on a second fragment, we believe */
641                 ZD_ASSERT(length + rx->fragment_length <=
642                           ARRAY_SIZE(rx->fragment));
643                 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
644                 memcpy(rx->fragment+rx->fragment_length, buffer, length);
645                 handle_rx_packet(usb, rx->fragment,
646                                  rx->fragment_length + length);
647                 rx->fragment_length = 0;
648                 spin_unlock(&rx->lock);
649         } else {
650                 spin_unlock(&rx->lock);
651                 handle_rx_packet(usb, buffer, length);
652         }
653
654 resubmit:
655         usb_submit_urb(urb, GFP_ATOMIC);
656 }
657
658 static struct urb *alloc_rx_urb(struct zd_usb *usb)
659 {
660         struct usb_device *udev = zd_usb_to_usbdev(usb);
661         struct urb *urb;
662         void *buffer;
663
664         urb = usb_alloc_urb(0, GFP_KERNEL);
665         if (!urb)
666                 return NULL;
667         buffer = usb_alloc_coherent(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
668                                     &urb->transfer_dma);
669         if (!buffer) {
670                 usb_free_urb(urb);
671                 return NULL;
672         }
673
674         usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
675                           buffer, USB_MAX_RX_SIZE,
676                           rx_urb_complete, usb);
677         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
678
679         return urb;
680 }
681
682 static void free_rx_urb(struct urb *urb)
683 {
684         if (!urb)
685                 return;
686         usb_free_coherent(urb->dev, urb->transfer_buffer_length,
687                           urb->transfer_buffer, urb->transfer_dma);
688         usb_free_urb(urb);
689 }
690
691 int zd_usb_enable_rx(struct zd_usb *usb)
692 {
693         int i, r;
694         struct zd_usb_rx *rx = &usb->rx;
695         struct urb **urbs;
696
697         dev_dbg_f(zd_usb_dev(usb), "\n");
698
699         r = -ENOMEM;
700         urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
701         if (!urbs)
702                 goto error;
703         for (i = 0; i < RX_URBS_COUNT; i++) {
704                 urbs[i] = alloc_rx_urb(usb);
705                 if (!urbs[i])
706                         goto error;
707         }
708
709         ZD_ASSERT(!irqs_disabled());
710         spin_lock_irq(&rx->lock);
711         if (rx->urbs) {
712                 spin_unlock_irq(&rx->lock);
713                 r = 0;
714                 goto error;
715         }
716         rx->urbs = urbs;
717         rx->urbs_count = RX_URBS_COUNT;
718         spin_unlock_irq(&rx->lock);
719
720         for (i = 0; i < RX_URBS_COUNT; i++) {
721                 r = usb_submit_urb(urbs[i], GFP_KERNEL);
722                 if (r)
723                         goto error_submit;
724         }
725
726         return 0;
727 error_submit:
728         for (i = 0; i < RX_URBS_COUNT; i++) {
729                 usb_kill_urb(urbs[i]);
730         }
731         spin_lock_irq(&rx->lock);
732         rx->urbs = NULL;
733         rx->urbs_count = 0;
734         spin_unlock_irq(&rx->lock);
735 error:
736         if (urbs) {
737                 for (i = 0; i < RX_URBS_COUNT; i++)
738                         free_rx_urb(urbs[i]);
739         }
740         return r;
741 }
742
743 void zd_usb_disable_rx(struct zd_usb *usb)
744 {
745         int i;
746         unsigned long flags;
747         struct urb **urbs;
748         unsigned int count;
749         struct zd_usb_rx *rx = &usb->rx;
750
751         spin_lock_irqsave(&rx->lock, flags);
752         urbs = rx->urbs;
753         count = rx->urbs_count;
754         spin_unlock_irqrestore(&rx->lock, flags);
755         if (!urbs)
756                 return;
757
758         for (i = 0; i < count; i++) {
759                 usb_kill_urb(urbs[i]);
760                 free_rx_urb(urbs[i]);
761         }
762         kfree(urbs);
763
764         spin_lock_irqsave(&rx->lock, flags);
765         rx->urbs = NULL;
766         rx->urbs_count = 0;
767         spin_unlock_irqrestore(&rx->lock, flags);
768 }
769
770 /**
771  * zd_usb_disable_tx - disable transmission
772  * @usb: the zd1211rw-private USB structure
773  *
774  * Frees all URBs in the free list and marks the transmission as disabled.
775  */
776 void zd_usb_disable_tx(struct zd_usb *usb)
777 {
778         struct zd_usb_tx *tx = &usb->tx;
779         unsigned long flags;
780         struct list_head *pos, *n;
781
782         spin_lock_irqsave(&tx->lock, flags);
783         list_for_each_safe(pos, n, &tx->free_urb_list) {
784                 list_del(pos);
785                 usb_free_urb(list_entry(pos, struct urb, urb_list));
786         }
787         tx->enabled = 0;
788         tx->submitted_urbs = 0;
789         /* The stopped state is ignored, relying on ieee80211_wake_queues()
790          * in a potentionally following zd_usb_enable_tx().
791          */
792         spin_unlock_irqrestore(&tx->lock, flags);
793 }
794
795 /**
796  * zd_usb_enable_tx - enables transmission
797  * @usb: a &struct zd_usb pointer
798  *
799  * This function enables transmission and prepares the &zd_usb_tx data
800  * structure.
801  */
802 void zd_usb_enable_tx(struct zd_usb *usb)
803 {
804         unsigned long flags;
805         struct zd_usb_tx *tx = &usb->tx;
806
807         spin_lock_irqsave(&tx->lock, flags);
808         tx->enabled = 1;
809         tx->submitted_urbs = 0;
810         ieee80211_wake_queues(zd_usb_to_hw(usb));
811         tx->stopped = 0;
812         spin_unlock_irqrestore(&tx->lock, flags);
813 }
814
815 /**
816  * alloc_tx_urb - provides an tx URB
817  * @usb: a &struct zd_usb pointer
818  *
819  * Allocates a new URB. If possible takes the urb from the free list in
820  * usb->tx.
821  */
822 static struct urb *alloc_tx_urb(struct zd_usb *usb)
823 {
824         struct zd_usb_tx *tx = &usb->tx;
825         unsigned long flags;
826         struct list_head *entry;
827         struct urb *urb;
828
829         spin_lock_irqsave(&tx->lock, flags);
830         if (list_empty(&tx->free_urb_list)) {
831                 urb = usb_alloc_urb(0, GFP_ATOMIC);
832                 goto out;
833         }
834         entry = tx->free_urb_list.next;
835         list_del(entry);
836         urb = list_entry(entry, struct urb, urb_list);
837 out:
838         spin_unlock_irqrestore(&tx->lock, flags);
839         return urb;
840 }
841
842 /**
843  * free_tx_urb - frees a used tx URB
844  * @usb: a &struct zd_usb pointer
845  * @urb: URB to be freed
846  *
847  * Frees the the transmission URB, which means to put it on the free URB
848  * list.
849  */
850 static void free_tx_urb(struct zd_usb *usb, struct urb *urb)
851 {
852         struct zd_usb_tx *tx = &usb->tx;
853         unsigned long flags;
854
855         spin_lock_irqsave(&tx->lock, flags);
856         if (!tx->enabled) {
857                 usb_free_urb(urb);
858                 goto out;
859         }
860         list_add(&urb->urb_list, &tx->free_urb_list);
861 out:
862         spin_unlock_irqrestore(&tx->lock, flags);
863 }
864
865 static void tx_dec_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_LOW) {
873                 ieee80211_wake_queues(zd_usb_to_hw(usb));
874                 tx->stopped = 0;
875         }
876         spin_unlock_irqrestore(&tx->lock, flags);
877 }
878
879 static void tx_inc_submitted_urbs(struct zd_usb *usb)
880 {
881         struct zd_usb_tx *tx = &usb->tx;
882         unsigned long flags;
883
884         spin_lock_irqsave(&tx->lock, flags);
885         ++tx->submitted_urbs;
886         if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
887                 ieee80211_stop_queues(zd_usb_to_hw(usb));
888                 tx->stopped = 1;
889         }
890         spin_unlock_irqrestore(&tx->lock, flags);
891 }
892
893 /**
894  * tx_urb_complete - completes the execution of an URB
895  * @urb: a URB
896  *
897  * This function is called if the URB has been transferred to a device or an
898  * error has happened.
899  */
900 static void tx_urb_complete(struct urb *urb)
901 {
902         int r;
903         struct sk_buff *skb;
904         struct ieee80211_tx_info *info;
905         struct zd_usb *usb;
906
907         switch (urb->status) {
908         case 0:
909                 break;
910         case -ESHUTDOWN:
911         case -EINVAL:
912         case -ENODEV:
913         case -ENOENT:
914         case -ECONNRESET:
915         case -EPIPE:
916                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
917                 break;
918         default:
919                 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
920                 goto resubmit;
921         }
922 free_urb:
923         skb = (struct sk_buff *)urb->context;
924         /*
925          * grab 'usb' pointer before handing off the skb (since
926          * it might be freed by zd_mac_tx_to_dev or mac80211)
927          */
928         info = IEEE80211_SKB_CB(skb);
929         usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb;
930         zd_mac_tx_to_dev(skb, urb->status);
931         free_tx_urb(usb, urb);
932         tx_dec_submitted_urbs(usb);
933         return;
934 resubmit:
935         r = usb_submit_urb(urb, GFP_ATOMIC);
936         if (r) {
937                 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
938                 goto free_urb;
939         }
940 }
941
942 /**
943  * zd_usb_tx: initiates transfer of a frame of the device
944  *
945  * @usb: the zd1211rw-private USB structure
946  * @skb: a &struct sk_buff pointer
947  *
948  * This function tranmits a frame to the device. It doesn't wait for
949  * completion. The frame must contain the control set and have all the
950  * control set information available.
951  *
952  * The function returns 0 if the transfer has been successfully initiated.
953  */
954 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
955 {
956         int r;
957         struct usb_device *udev = zd_usb_to_usbdev(usb);
958         struct urb *urb;
959
960         urb = alloc_tx_urb(usb);
961         if (!urb) {
962                 r = -ENOMEM;
963                 goto out;
964         }
965
966         usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
967                           skb->data, skb->len, tx_urb_complete, skb);
968
969         r = usb_submit_urb(urb, GFP_ATOMIC);
970         if (r)
971                 goto error;
972         tx_inc_submitted_urbs(usb);
973         return 0;
974 error:
975         free_tx_urb(usb, urb);
976 out:
977         return r;
978 }
979
980 static inline void init_usb_interrupt(struct zd_usb *usb)
981 {
982         struct zd_usb_interrupt *intr = &usb->intr;
983
984         spin_lock_init(&intr->lock);
985         intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
986         init_completion(&intr->read_regs.completion);
987         intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
988 }
989
990 static inline void init_usb_rx(struct zd_usb *usb)
991 {
992         struct zd_usb_rx *rx = &usb->rx;
993         spin_lock_init(&rx->lock);
994         if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
995                 rx->usb_packet_size = 512;
996         } else {
997                 rx->usb_packet_size = 64;
998         }
999         ZD_ASSERT(rx->fragment_length == 0);
1000 }
1001
1002 static inline void init_usb_tx(struct zd_usb *usb)
1003 {
1004         struct zd_usb_tx *tx = &usb->tx;
1005         spin_lock_init(&tx->lock);
1006         tx->enabled = 0;
1007         tx->stopped = 0;
1008         INIT_LIST_HEAD(&tx->free_urb_list);
1009         tx->submitted_urbs = 0;
1010 }
1011
1012 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
1013                  struct usb_interface *intf)
1014 {
1015         memset(usb, 0, sizeof(*usb));
1016         usb->intf = usb_get_intf(intf);
1017         usb_set_intfdata(usb->intf, hw);
1018         init_usb_interrupt(usb);
1019         init_usb_tx(usb);
1020         init_usb_rx(usb);
1021 }
1022
1023 void zd_usb_clear(struct zd_usb *usb)
1024 {
1025         usb_set_intfdata(usb->intf, NULL);
1026         usb_put_intf(usb->intf);
1027         ZD_MEMCLEAR(usb, sizeof(*usb));
1028         /* FIXME: usb_interrupt, usb_tx, usb_rx? */
1029 }
1030
1031 static const char *speed(enum usb_device_speed speed)
1032 {
1033         switch (speed) {
1034         case USB_SPEED_LOW:
1035                 return "low";
1036         case USB_SPEED_FULL:
1037                 return "full";
1038         case USB_SPEED_HIGH:
1039                 return "high";
1040         default:
1041                 return "unknown speed";
1042         }
1043 }
1044
1045 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1046 {
1047         return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1048                 le16_to_cpu(udev->descriptor.idVendor),
1049                 le16_to_cpu(udev->descriptor.idProduct),
1050                 get_bcdDevice(udev),
1051                 speed(udev->speed));
1052 }
1053
1054 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1055 {
1056         struct usb_device *udev = interface_to_usbdev(usb->intf);
1057         return scnprint_id(udev, buffer, size);
1058 }
1059
1060 #ifdef DEBUG
1061 static void print_id(struct usb_device *udev)
1062 {
1063         char buffer[40];
1064
1065         scnprint_id(udev, buffer, sizeof(buffer));
1066         buffer[sizeof(buffer)-1] = 0;
1067         dev_dbg_f(&udev->dev, "%s\n", buffer);
1068 }
1069 #else
1070 #define print_id(udev) do { } while (0)
1071 #endif
1072
1073 static int eject_installer(struct usb_interface *intf)
1074 {
1075         struct usb_device *udev = interface_to_usbdev(intf);
1076         struct usb_host_interface *iface_desc = &intf->altsetting[0];
1077         struct usb_endpoint_descriptor *endpoint;
1078         unsigned char *cmd;
1079         u8 bulk_out_ep;
1080         int r;
1081
1082         /* Find bulk out endpoint */
1083         for (r = 1; r >= 0; r--) {
1084                 endpoint = &iface_desc->endpoint[r].desc;
1085                 if (usb_endpoint_dir_out(endpoint) &&
1086                     usb_endpoint_xfer_bulk(endpoint)) {
1087                         bulk_out_ep = endpoint->bEndpointAddress;
1088                         break;
1089                 }
1090         }
1091         if (r == -1) {
1092                 dev_err(&udev->dev,
1093                         "zd1211rw: Could not find bulk out endpoint\n");
1094                 return -ENODEV;
1095         }
1096
1097         cmd = kzalloc(31, GFP_KERNEL);
1098         if (cmd == NULL)
1099                 return -ENODEV;
1100
1101         /* USB bulk command block */
1102         cmd[0] = 0x55;  /* bulk command signature */
1103         cmd[1] = 0x53;  /* bulk command signature */
1104         cmd[2] = 0x42;  /* bulk command signature */
1105         cmd[3] = 0x43;  /* bulk command signature */
1106         cmd[14] = 6;    /* command length */
1107
1108         cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1109         cmd[19] = 0x2;  /* eject disc */
1110
1111         dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1112         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1113                 cmd, 31, NULL, 2000);
1114         kfree(cmd);
1115         if (r)
1116                 return r;
1117
1118         /* At this point, the device disconnects and reconnects with the real
1119          * ID numbers. */
1120
1121         usb_set_intfdata(intf, NULL);
1122         return 0;
1123 }
1124
1125 int zd_usb_init_hw(struct zd_usb *usb)
1126 {
1127         int r;
1128         struct zd_mac *mac = zd_usb_to_mac(usb);
1129
1130         dev_dbg_f(zd_usb_dev(usb), "\n");
1131
1132         r = upload_firmware(usb);
1133         if (r) {
1134                 dev_err(zd_usb_dev(usb),
1135                        "couldn't load firmware. Error number %d\n", r);
1136                 return r;
1137         }
1138
1139         r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1140         if (r) {
1141                 dev_dbg_f(zd_usb_dev(usb),
1142                         "couldn't reset configuration. Error number %d\n", r);
1143                 return r;
1144         }
1145
1146         r = zd_mac_init_hw(mac->hw);
1147         if (r) {
1148                 dev_dbg_f(zd_usb_dev(usb),
1149                          "couldn't initialize mac. Error number %d\n", r);
1150                 return r;
1151         }
1152
1153         usb->initialized = 1;
1154         return 0;
1155 }
1156
1157 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1158 {
1159         int r;
1160         struct usb_device *udev = interface_to_usbdev(intf);
1161         struct zd_usb *usb;
1162         struct ieee80211_hw *hw = NULL;
1163
1164         print_id(udev);
1165
1166         if (id->driver_info & DEVICE_INSTALLER)
1167                 return eject_installer(intf);
1168
1169         switch (udev->speed) {
1170         case USB_SPEED_LOW:
1171         case USB_SPEED_FULL:
1172         case USB_SPEED_HIGH:
1173                 break;
1174         default:
1175                 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1176                 r = -ENODEV;
1177                 goto error;
1178         }
1179
1180         r = usb_reset_device(udev);
1181         if (r) {
1182                 dev_err(&intf->dev,
1183                         "couldn't reset usb device. Error number %d\n", r);
1184                 goto error;
1185         }
1186
1187         hw = zd_mac_alloc_hw(intf);
1188         if (hw == NULL) {
1189                 r = -ENOMEM;
1190                 goto error;
1191         }
1192
1193         usb = &zd_hw_mac(hw)->chip.usb;
1194         usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1195
1196         r = zd_mac_preinit_hw(hw);
1197         if (r) {
1198                 dev_dbg_f(&intf->dev,
1199                          "couldn't initialize mac. Error number %d\n", r);
1200                 goto error;
1201         }
1202
1203         r = ieee80211_register_hw(hw);
1204         if (r) {
1205                 dev_dbg_f(&intf->dev,
1206                          "couldn't register device. Error number %d\n", r);
1207                 goto error;
1208         }
1209
1210         dev_dbg_f(&intf->dev, "successful\n");
1211         dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
1212         return 0;
1213 error:
1214         usb_reset_device(interface_to_usbdev(intf));
1215         if (hw) {
1216                 zd_mac_clear(zd_hw_mac(hw));
1217                 ieee80211_free_hw(hw);
1218         }
1219         return r;
1220 }
1221
1222 static void disconnect(struct usb_interface *intf)
1223 {
1224         struct ieee80211_hw *hw = zd_intf_to_hw(intf);
1225         struct zd_mac *mac;
1226         struct zd_usb *usb;
1227
1228         /* Either something really bad happened, or we're just dealing with
1229          * a DEVICE_INSTALLER. */
1230         if (hw == NULL)
1231                 return;
1232
1233         mac = zd_hw_mac(hw);
1234         usb = &mac->chip.usb;
1235
1236         dev_dbg_f(zd_usb_dev(usb), "\n");
1237
1238         ieee80211_unregister_hw(hw);
1239
1240         /* Just in case something has gone wrong! */
1241         zd_usb_disable_rx(usb);
1242         zd_usb_disable_int(usb);
1243
1244         /* If the disconnect has been caused by a removal of the
1245          * driver module, the reset allows reloading of the driver. If the
1246          * reset will not be executed here, the upload of the firmware in the
1247          * probe function caused by the reloading of the driver will fail.
1248          */
1249         usb_reset_device(interface_to_usbdev(intf));
1250
1251         zd_mac_clear(mac);
1252         ieee80211_free_hw(hw);
1253         dev_dbg(&intf->dev, "disconnected\n");
1254 }
1255
1256 static struct usb_driver driver = {
1257         .name           = KBUILD_MODNAME,
1258         .id_table       = usb_ids,
1259         .probe          = probe,
1260         .disconnect     = disconnect,
1261 };
1262
1263 struct workqueue_struct *zd_workqueue;
1264
1265 static int __init usb_init(void)
1266 {
1267         int r;
1268
1269         pr_debug("%s usb_init()\n", driver.name);
1270
1271         zd_workqueue = create_singlethread_workqueue(driver.name);
1272         if (zd_workqueue == NULL) {
1273                 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1274                 return -ENOMEM;
1275         }
1276
1277         r = usb_register(&driver);
1278         if (r) {
1279                 destroy_workqueue(zd_workqueue);
1280                 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1281                        driver.name, r);
1282                 return r;
1283         }
1284
1285         pr_debug("%s initialized\n", driver.name);
1286         return 0;
1287 }
1288
1289 static void __exit usb_exit(void)
1290 {
1291         pr_debug("%s usb_exit()\n", driver.name);
1292         usb_deregister(&driver);
1293         destroy_workqueue(zd_workqueue);
1294 }
1295
1296 module_init(usb_init);
1297 module_exit(usb_exit);
1298
1299 static int usb_int_regs_length(unsigned int count)
1300 {
1301         return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1302 }
1303
1304 static void prepare_read_regs_int(struct zd_usb *usb)
1305 {
1306         struct zd_usb_interrupt *intr = &usb->intr;
1307
1308         spin_lock_irq(&intr->lock);
1309         intr->read_regs_enabled = 1;
1310         INIT_COMPLETION(intr->read_regs.completion);
1311         spin_unlock_irq(&intr->lock);
1312 }
1313
1314 static void disable_read_regs_int(struct zd_usb *usb)
1315 {
1316         struct zd_usb_interrupt *intr = &usb->intr;
1317
1318         spin_lock_irq(&intr->lock);
1319         intr->read_regs_enabled = 0;
1320         spin_unlock_irq(&intr->lock);
1321 }
1322
1323 static int get_results(struct zd_usb *usb, u16 *values,
1324                        struct usb_req_read_regs *req, unsigned int count)
1325 {
1326         int r;
1327         int i;
1328         struct zd_usb_interrupt *intr = &usb->intr;
1329         struct read_regs_int *rr = &intr->read_regs;
1330         struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1331
1332         spin_lock_irq(&intr->lock);
1333
1334         r = -EIO;
1335         /* The created block size seems to be larger than expected.
1336          * However results appear to be correct.
1337          */
1338         if (rr->length < usb_int_regs_length(count)) {
1339                 dev_dbg_f(zd_usb_dev(usb),
1340                          "error: actual length %d less than expected %d\n",
1341                          rr->length, usb_int_regs_length(count));
1342                 goto error_unlock;
1343         }
1344         if (rr->length > sizeof(rr->buffer)) {
1345                 dev_dbg_f(zd_usb_dev(usb),
1346                          "error: actual length %d exceeds buffer size %zu\n",
1347                          rr->length, sizeof(rr->buffer));
1348                 goto error_unlock;
1349         }
1350
1351         for (i = 0; i < count; i++) {
1352                 struct reg_data *rd = &regs->regs[i];
1353                 if (rd->addr != req->addr[i]) {
1354                         dev_dbg_f(zd_usb_dev(usb),
1355                                  "rd[%d] addr %#06hx expected %#06hx\n", i,
1356                                  le16_to_cpu(rd->addr),
1357                                  le16_to_cpu(req->addr[i]));
1358                         goto error_unlock;
1359                 }
1360                 values[i] = le16_to_cpu(rd->value);
1361         }
1362
1363         r = 0;
1364 error_unlock:
1365         spin_unlock_irq(&intr->lock);
1366         return r;
1367 }
1368
1369 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1370                      const zd_addr_t *addresses, unsigned int count)
1371 {
1372         int r;
1373         int i, req_len, actual_req_len;
1374         struct usb_device *udev;
1375         struct usb_req_read_regs *req = NULL;
1376         unsigned long timeout;
1377
1378         if (count < 1) {
1379                 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1380                 return -EINVAL;
1381         }
1382         if (count > USB_MAX_IOREAD16_COUNT) {
1383                 dev_dbg_f(zd_usb_dev(usb),
1384                          "error: count %u exceeds possible max %u\n",
1385                          count, USB_MAX_IOREAD16_COUNT);
1386                 return -EINVAL;
1387         }
1388         if (in_atomic()) {
1389                 dev_dbg_f(zd_usb_dev(usb),
1390                          "error: io in atomic context not supported\n");
1391                 return -EWOULDBLOCK;
1392         }
1393         if (!usb_int_enabled(usb)) {
1394                  dev_dbg_f(zd_usb_dev(usb),
1395                           "error: usb interrupt not enabled\n");
1396                 return -EWOULDBLOCK;
1397         }
1398
1399         req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1400         req = kmalloc(req_len, GFP_KERNEL);
1401         if (!req)
1402                 return -ENOMEM;
1403         req->id = cpu_to_le16(USB_REQ_READ_REGS);
1404         for (i = 0; i < count; i++)
1405                 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1406
1407         udev = zd_usb_to_usbdev(usb);
1408         prepare_read_regs_int(usb);
1409         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1410                          req, req_len, &actual_req_len, 1000 /* ms */);
1411         if (r) {
1412                 dev_dbg_f(zd_usb_dev(usb),
1413                         "error in usb_bulk_msg(). Error number %d\n", r);
1414                 goto error;
1415         }
1416         if (req_len != actual_req_len) {
1417                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1418                         " req_len %d != actual_req_len %d\n",
1419                         req_len, actual_req_len);
1420                 r = -EIO;
1421                 goto error;
1422         }
1423
1424         timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1425                                               msecs_to_jiffies(1000));
1426         if (!timeout) {
1427                 disable_read_regs_int(usb);
1428                 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1429                 r = -ETIMEDOUT;
1430                 goto error;
1431         }
1432
1433         r = get_results(usb, values, req, count);
1434 error:
1435         kfree(req);
1436         return r;
1437 }
1438
1439 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1440                       unsigned int count)
1441 {
1442         int r;
1443         struct usb_device *udev;
1444         struct usb_req_write_regs *req = NULL;
1445         int i, req_len, actual_req_len;
1446
1447         if (count == 0)
1448                 return 0;
1449         if (count > USB_MAX_IOWRITE16_COUNT) {
1450                 dev_dbg_f(zd_usb_dev(usb),
1451                         "error: count %u exceeds possible max %u\n",
1452                         count, USB_MAX_IOWRITE16_COUNT);
1453                 return -EINVAL;
1454         }
1455         if (in_atomic()) {
1456                 dev_dbg_f(zd_usb_dev(usb),
1457                         "error: io in atomic context not supported\n");
1458                 return -EWOULDBLOCK;
1459         }
1460
1461         req_len = sizeof(struct usb_req_write_regs) +
1462                   count * sizeof(struct reg_data);
1463         req = kmalloc(req_len, GFP_KERNEL);
1464         if (!req)
1465                 return -ENOMEM;
1466
1467         req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1468         for (i = 0; i < count; i++) {
1469                 struct reg_data *rw  = &req->reg_writes[i];
1470                 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1471                 rw->value = cpu_to_le16(ioreqs[i].value);
1472         }
1473
1474         udev = zd_usb_to_usbdev(usb);
1475         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1476                          req, req_len, &actual_req_len, 1000 /* ms */);
1477         if (r) {
1478                 dev_dbg_f(zd_usb_dev(usb),
1479                         "error in usb_bulk_msg(). Error number %d\n", r);
1480                 goto error;
1481         }
1482         if (req_len != actual_req_len) {
1483                 dev_dbg_f(zd_usb_dev(usb),
1484                         "error in usb_bulk_msg()"
1485                         " req_len %d != actual_req_len %d\n",
1486                         req_len, actual_req_len);
1487                 r = -EIO;
1488                 goto error;
1489         }
1490
1491         /* FALL-THROUGH with r == 0 */
1492 error:
1493         kfree(req);
1494         return r;
1495 }
1496
1497 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1498 {
1499         int r;
1500         struct usb_device *udev;
1501         struct usb_req_rfwrite *req = NULL;
1502         int i, req_len, actual_req_len;
1503         u16 bit_value_template;
1504
1505         if (in_atomic()) {
1506                 dev_dbg_f(zd_usb_dev(usb),
1507                         "error: io in atomic context not supported\n");
1508                 return -EWOULDBLOCK;
1509         }
1510         if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1511                 dev_dbg_f(zd_usb_dev(usb),
1512                         "error: bits %d are smaller than"
1513                         " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1514                         bits, USB_MIN_RFWRITE_BIT_COUNT);
1515                 return -EINVAL;
1516         }
1517         if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1518                 dev_dbg_f(zd_usb_dev(usb),
1519                         "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1520                         bits, USB_MAX_RFWRITE_BIT_COUNT);
1521                 return -EINVAL;
1522         }
1523 #ifdef DEBUG
1524         if (value & (~0UL << bits)) {
1525                 dev_dbg_f(zd_usb_dev(usb),
1526                         "error: value %#09x has bits >= %d set\n",
1527                         value, bits);
1528                 return -EINVAL;
1529         }
1530 #endif /* DEBUG */
1531
1532         dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1533
1534         r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1535         if (r) {
1536                 dev_dbg_f(zd_usb_dev(usb),
1537                         "error %d: Couldn't read CR203\n", r);
1538                 goto out;
1539         }
1540         bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1541
1542         req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
1543         req = kmalloc(req_len, GFP_KERNEL);
1544         if (!req)
1545                 return -ENOMEM;
1546
1547         req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1548         /* 1: 3683a, but not used in ZYDAS driver */
1549         req->value = cpu_to_le16(2);
1550         req->bits = cpu_to_le16(bits);
1551
1552         for (i = 0; i < bits; i++) {
1553                 u16 bv = bit_value_template;
1554                 if (value & (1 << (bits-1-i)))
1555                         bv |= RF_DATA;
1556                 req->bit_values[i] = cpu_to_le16(bv);
1557         }
1558
1559         udev = zd_usb_to_usbdev(usb);
1560         r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1561                          req, req_len, &actual_req_len, 1000 /* ms */);
1562         if (r) {
1563                 dev_dbg_f(zd_usb_dev(usb),
1564                         "error in usb_bulk_msg(). Error number %d\n", r);
1565                 goto out;
1566         }
1567         if (req_len != actual_req_len) {
1568                 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1569                         " req_len %d != actual_req_len %d\n",
1570                         req_len, actual_req_len);
1571                 r = -EIO;
1572                 goto out;
1573         }
1574
1575         /* FALL-THROUGH with r == 0 */
1576 out:
1577         kfree(req);
1578         return r;
1579 }