1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* ZD1211 USB-WLAN driver for Linux
3 *
4 * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
5 * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
6 * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net>
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/firmware.h>
12 #include <linux/device.h>
13 #include <linux/errno.h>
14 #include <linux/slab.h>
15 #include <linux/skbuff.h>
16 #include <linux/usb.h>
17 #include <linux/workqueue.h>
18 #include <linux/module.h>
19 #include <net/mac80211.h>
20 #include <asm/unaligned.h>
21
22 #include "zd_def.h"
23 #include "zd_mac.h"
24 #include "zd_usb.h"
25
26 static const struct usb_device_id usb_ids[] = {
27 /* ZD1211 */
28 { USB_DEVICE(0x0105, 0x145f), .driver_info = DEVICE_ZD1211 },
29 { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
30 { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
31 { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
32 { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
33 { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
34 { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
35 { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
36 { USB_DEVICE(0x0ace, 0xa211), .driver_info = DEVICE_ZD1211 },
37 { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
38 { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
39 { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
40 { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
41 { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
42 { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
43 { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 },
44 { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
45 { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
46 { USB_DEVICE(0x14ea, 0xab10), .driver_info = DEVICE_ZD1211 },
47 { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
48 { USB_DEVICE(0x157e, 0x300a), .driver_info = DEVICE_ZD1211 },
49 { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
50 { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
51 { USB_DEVICE(0x157e, 0x3207), .driver_info = DEVICE_ZD1211 },
52 { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
53 { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
54 /* ZD1211B */
55 { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
56 { USB_DEVICE(0x0409, 0x0248), .driver_info = DEVICE_ZD1211B },
57 { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
58 { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
59 { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
60 { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
61 { USB_DEVICE(0x054c, 0x0257), .driver_info = DEVICE_ZD1211B },
62 { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
63 { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
64 { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
65 { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
66 { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
67 { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
68 { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211B },
69 { USB_DEVICE(0x07fa, 0x1196), .driver_info = DEVICE_ZD1211B },
70 { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
71 { USB_DEVICE(0x083a, 0xe501), .driver_info = DEVICE_ZD1211B },
72 { USB_DEVICE(0x083a, 0xe503), .driver_info = DEVICE_ZD1211B },
73 { USB_DEVICE(0x083a, 0xe506), .driver_info = DEVICE_ZD1211B },
74 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
75 { USB_DEVICE(0x0ace, 0xb215), .driver_info = DEVICE_ZD1211B },
76 { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
77 { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
78 { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
79 { USB_DEVICE(0x0df6, 0x0036), .driver_info = DEVICE_ZD1211B },
80 { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
81 { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
82 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
83 { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
84 { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
85 { USB_DEVICE(0x2019, 0xed01), .driver_info = DEVICE_ZD1211B },
86 /* "Driverless" devices that need ejecting */
87 { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
88 { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
89 {}
90 };
91
92 MODULE_LICENSE("GPL");
93 MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
94 MODULE_AUTHOR("Ulrich Kunitz");
95 MODULE_AUTHOR("Daniel Drake");
96 MODULE_VERSION("1.0");
97 MODULE_DEVICE_TABLE(usb, usb_ids);
98
99 #define FW_ZD1211_PREFIX "zd1211/zd1211_"
100 #define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
101
102 static bool check_read_regs(struct zd_usb *usb, struct usb_req_read_regs *req,
103 unsigned int count);
104
105 /* USB device initialization */
106 static void int_urb_complete(struct urb *urb);
107
request_fw_file(const struct firmware ** fw,const char * name,struct device * device)108 static int request_fw_file(
109 const struct firmware **fw, const char *name, struct device *device)
110 {
111 int r;
112
113 dev_dbg_f(device, "fw name %s\n", name);
114
115 r = request_firmware(fw, name, device);
116 if (r)
117 dev_err(device,
118 "Could not load firmware file %s. Error number %d\n",
119 name, r);
120 return r;
121 }
122
get_bcdDevice(const struct usb_device * udev)123 static inline u16 get_bcdDevice(const struct usb_device *udev)
124 {
125 return le16_to_cpu(udev->descriptor.bcdDevice);
126 }
127
128 enum upload_code_flags {
129 REBOOT = 1,
130 };
131
132 /* Ensures that MAX_TRANSFER_SIZE is even. */
133 #define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
134
upload_code(struct usb_device * udev,const u8 * data,size_t size,u16 code_offset,int flags)135 static int upload_code(struct usb_device *udev,
136 const u8 *data, size_t size, u16 code_offset, int flags)
137 {
138 u8 *p;
139 int r;
140
141 /* USB request blocks need "kmalloced" buffers.
142 */
143 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
144 if (!p) {
145 r = -ENOMEM;
146 goto error;
147 }
148
149 size &= ~1;
150 while (size > 0) {
151 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
152 size : MAX_TRANSFER_SIZE;
153
154 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
155
156 memcpy(p, data, transfer_size);
157 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
158 USB_REQ_FIRMWARE_DOWNLOAD,
159 USB_DIR_OUT | USB_TYPE_VENDOR,
160 code_offset, 0, p, transfer_size, 1000 /* ms */);
161 if (r < 0) {
162 dev_err(&udev->dev,
163 "USB control request for firmware upload"
164 " failed. Error number %d\n", r);
165 goto error;
166 }
167 transfer_size = r & ~1;
168
169 size -= transfer_size;
170 data += transfer_size;
171 code_offset += transfer_size/sizeof(u16);
172 }
173
174 if (flags & REBOOT) {
175 u8 ret;
176
177 /* Use "DMA-aware" buffer. */
178 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
179 USB_REQ_FIRMWARE_CONFIRM,
180 USB_DIR_IN | USB_TYPE_VENDOR,
181 0, 0, p, sizeof(ret), 5000 /* ms */);
182 if (r != sizeof(ret)) {
183 dev_err(&udev->dev,
184 "control request firmware confirmation failed."
185 " Return value %d\n", r);
186 if (r >= 0)
187 r = -ENODEV;
188 goto error;
189 }
190 ret = p[0];
191 if (ret & 0x80) {
192 dev_err(&udev->dev,
193 "Internal error while downloading."
194 " Firmware confirm return value %#04x\n",
195 (unsigned int)ret);
196 r = -ENODEV;
197 goto error;
198 }
199 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
200 (unsigned int)ret);
201 }
202
203 r = 0;
204 error:
205 kfree(p);
206 return r;
207 }
208
get_word(const void * data,u16 offset)209 static u16 get_word(const void *data, u16 offset)
210 {
211 const __le16 *p = data;
212 return le16_to_cpu(p[offset]);
213 }
214
get_fw_name(struct zd_usb * usb,char * buffer,size_t size,const char * postfix)215 static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
216 const char* postfix)
217 {
218 scnprintf(buffer, size, "%s%s",
219 usb->is_zd1211b ?
220 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
221 postfix);
222 return buffer;
223 }
224
handle_version_mismatch(struct zd_usb * usb,const struct firmware * ub_fw)225 static int handle_version_mismatch(struct zd_usb *usb,
226 const struct firmware *ub_fw)
227 {
228 struct usb_device *udev = zd_usb_to_usbdev(usb);
229 const struct firmware *ur_fw = NULL;
230 int offset;
231 int r = 0;
232 char fw_name[128];
233
234 r = request_fw_file(&ur_fw,
235 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
236 &udev->dev);
237 if (r)
238 goto error;
239
240 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
241 if (r)
242 goto error;
243
244 offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
245 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
246 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
247
248 /* At this point, the vendor driver downloads the whole firmware
249 * image, hacks around with version IDs, and uploads it again,
250 * completely overwriting the boot code. We do not do this here as
251 * it is not required on any tested devices, and it is suspected to
252 * cause problems. */
253 error:
254 release_firmware(ur_fw);
255 return r;
256 }
257
upload_firmware(struct zd_usb * usb)258 static int upload_firmware(struct zd_usb *usb)
259 {
260 int r;
261 u16 fw_bcdDevice;
262 u16 bcdDevice;
263 struct usb_device *udev = zd_usb_to_usbdev(usb);
264 const struct firmware *ub_fw = NULL;
265 const struct firmware *uph_fw = NULL;
266 char fw_name[128];
267
268 bcdDevice = get_bcdDevice(udev);
269
270 r = request_fw_file(&ub_fw,
271 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
272 &udev->dev);
273 if (r)
274 goto error;
275
276 fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
277
278 if (fw_bcdDevice != bcdDevice) {
279 dev_info(&udev->dev,
280 "firmware version %#06x and device bootcode version "
281 "%#06x differ\n", fw_bcdDevice, bcdDevice);
282 if (bcdDevice <= 0x4313)
283 dev_warn(&udev->dev, "device has old bootcode, please "
284 "report success or failure\n");
285
286 r = handle_version_mismatch(usb, ub_fw);
287 if (r)
288 goto error;
289 } else {
290 dev_dbg_f(&udev->dev,
291 "firmware device id %#06x is equal to the "
292 "actual device id\n", fw_bcdDevice);
293 }
294
295
296 r = request_fw_file(&uph_fw,
297 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
298 &udev->dev);
299 if (r)
300 goto error;
301
302 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
303 if (r) {
304 dev_err(&udev->dev,
305 "Could not upload firmware code uph. Error number %d\n",
306 r);
307 }
308
309 /* FALL-THROUGH */
310 error:
311 release_firmware(ub_fw);
312 release_firmware(uph_fw);
313 return r;
314 }
315
316 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ur");
317 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ur");
318 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "ub");
319 MODULE_FIRMWARE(FW_ZD1211_PREFIX "ub");
320 MODULE_FIRMWARE(FW_ZD1211B_PREFIX "uphr");
321 MODULE_FIRMWARE(FW_ZD1211_PREFIX "uphr");
322
323 /* Read data from device address space using "firmware interface" which does
324 * not require firmware to be loaded. */
zd_usb_read_fw(struct zd_usb * usb,zd_addr_t addr,u8 * data,u16 len)325 int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
326 {
327 int r;
328 struct usb_device *udev = zd_usb_to_usbdev(usb);
329 u8 *buf;
330
331 /* Use "DMA-aware" buffer. */
332 buf = kmalloc(len, GFP_KERNEL);
333 if (!buf)
334 return -ENOMEM;
335 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
336 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
337 buf, len, 5000);
338 if (r < 0) {
339 dev_err(&udev->dev,
340 "read over firmware interface failed: %d\n", r);
341 goto exit;
342 } else if (r != len) {
343 dev_err(&udev->dev,
344 "incomplete read over firmware interface: %d/%d\n",
345 r, len);
346 r = -EIO;
347 goto exit;
348 }
349 r = 0;
350 memcpy(data, buf, len);
351 exit:
352 kfree(buf);
353 return r;
354 }
355
356 #define urb_dev(urb) (&(urb)->dev->dev)
357
handle_regs_int_override(struct urb * urb)358 static inline void handle_regs_int_override(struct urb *urb)
359 {
360 struct zd_usb *usb = urb->context;
361 struct zd_usb_interrupt *intr = &usb->intr;
362 unsigned long flags;
363
364 spin_lock_irqsave(&intr->lock, flags);
365 if (atomic_read(&intr->read_regs_enabled)) {
366 atomic_set(&intr->read_regs_enabled, 0);
367 intr->read_regs_int_overridden = 1;
368 complete(&intr->read_regs.completion);
369 }
370 spin_unlock_irqrestore(&intr->lock, flags);
371 }
372
handle_regs_int(struct urb * urb)373 static inline void handle_regs_int(struct urb *urb)
374 {
375 struct zd_usb *usb = urb->context;
376 struct zd_usb_interrupt *intr = &usb->intr;
377 unsigned long flags;
378 int len;
379 u16 int_num;
380
381 ZD_ASSERT(in_interrupt());
382 spin_lock_irqsave(&intr->lock, flags);
383
384 int_num = le16_to_cpu(*(__le16 *)(urb->transfer_buffer+2));
385 if (int_num == CR_INTERRUPT) {
386 struct zd_mac *mac = zd_hw_mac(zd_usb_to_hw(urb->context));
387 spin_lock(&mac->lock);
388 memcpy(&mac->intr_buffer, urb->transfer_buffer,
389 USB_MAX_EP_INT_BUFFER);
390 spin_unlock(&mac->lock);
391 schedule_work(&mac->process_intr);
392 } else if (atomic_read(&intr->read_regs_enabled)) {
393 len = urb->actual_length;
394 intr->read_regs.length = urb->actual_length;
395 if (len > sizeof(intr->read_regs.buffer))
396 len = sizeof(intr->read_regs.buffer);
397
398 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
399
400 /* Sometimes USB_INT_ID_REGS is not overridden, but comes after
401 * USB_INT_ID_RETRY_FAILED. Read-reg retry then gets this
402 * delayed USB_INT_ID_REGS, but leaves USB_INT_ID_REGS of
403 * retry unhandled. Next read-reg command then might catch
404 * this wrong USB_INT_ID_REGS. Fix by ignoring wrong reads.
405 */
406 if (!check_read_regs(usb, intr->read_regs.req,
407 intr->read_regs.req_count))
408 goto out;
409
410 atomic_set(&intr->read_regs_enabled, 0);
411 intr->read_regs_int_overridden = 0;
412 complete(&intr->read_regs.completion);
413
414 goto out;
415 }
416
417 out:
418 spin_unlock_irqrestore(&intr->lock, flags);
419
420 /* CR_INTERRUPT might override read_reg too. */
421 if (int_num == CR_INTERRUPT && atomic_read(&intr->read_regs_enabled))
422 handle_regs_int_override(urb);
423 }
424
int_urb_complete(struct urb * urb)425 static void int_urb_complete(struct urb *urb)
426 {
427 int r;
428 struct usb_int_header *hdr;
429 struct zd_usb *usb;
430 struct zd_usb_interrupt *intr;
431
432 switch (urb->status) {
433 case 0:
434 break;
435 case -ESHUTDOWN:
436 case -EINVAL:
437 case -ENODEV:
438 case -ENOENT:
439 case -ECONNRESET:
440 case -EPIPE:
441 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
442 return;
443 default:
444 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
445 goto resubmit;
446 }
447
448 if (urb->actual_length < sizeof(hdr)) {
449 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
450 goto resubmit;
451 }
452
453 hdr = urb->transfer_buffer;
454 if (hdr->type != USB_INT_TYPE) {
455 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
456 goto resubmit;
457 }
458
459 /* USB_INT_ID_RETRY_FAILED triggered by tx-urb submit can override
460 * pending USB_INT_ID_REGS causing read command timeout.
461 */
462 usb = urb->context;
463 intr = &usb->intr;
464 if (hdr->id != USB_INT_ID_REGS && atomic_read(&intr->read_regs_enabled))
465 handle_regs_int_override(urb);
466
467 switch (hdr->id) {
468 case USB_INT_ID_REGS:
469 handle_regs_int(urb);
470 break;
471 case USB_INT_ID_RETRY_FAILED:
472 zd_mac_tx_failed(urb);
473 break;
474 default:
475 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
476 (unsigned int)hdr->id);
477 goto resubmit;
478 }
479
480 resubmit:
481 r = usb_submit_urb(urb, GFP_ATOMIC);
482 if (r) {
483 dev_dbg_f(urb_dev(urb), "error: resubmit urb %p err code %d\n",
484 urb, r);
485 /* TODO: add worker to reset intr->urb */
486 }
487 return;
488 }
489
int_urb_interval(struct usb_device * udev)490 static inline int int_urb_interval(struct usb_device *udev)
491 {
492 switch (udev->speed) {
493 case USB_SPEED_HIGH:
494 return 4;
495 case USB_SPEED_LOW:
496 return 10;
497 case USB_SPEED_FULL:
498 default:
499 return 1;
500 }
501 }
502
usb_int_enabled(struct zd_usb * usb)503 static inline int usb_int_enabled(struct zd_usb *usb)
504 {
505 unsigned long flags;
506 struct zd_usb_interrupt *intr = &usb->intr;
507 struct urb *urb;
508
509 spin_lock_irqsave(&intr->lock, flags);
510 urb = intr->urb;
511 spin_unlock_irqrestore(&intr->lock, flags);
512 return urb != NULL;
513 }
514
zd_usb_enable_int(struct zd_usb * usb)515 int zd_usb_enable_int(struct zd_usb *usb)
516 {
517 int r;
518 struct usb_device *udev = zd_usb_to_usbdev(usb);
519 struct zd_usb_interrupt *intr = &usb->intr;
520 struct urb *urb;
521
522 dev_dbg_f(zd_usb_dev(usb), "\n");
523
524 urb = usb_alloc_urb(0, GFP_KERNEL);
525 if (!urb) {
526 r = -ENOMEM;
527 goto out;
528 }
529
530 ZD_ASSERT(!irqs_disabled());
531 spin_lock_irq(&intr->lock);
532 if (intr->urb) {
533 spin_unlock_irq(&intr->lock);
534 r = 0;
535 goto error_free_urb;
536 }
537 intr->urb = urb;
538 spin_unlock_irq(&intr->lock);
539
540 r = -ENOMEM;
541 intr->buffer = usb_alloc_coherent(udev, USB_MAX_EP_INT_BUFFER,
542 GFP_KERNEL, &intr->buffer_dma);
543 if (!intr->buffer) {
544 dev_dbg_f(zd_usb_dev(usb),
545 "couldn't allocate transfer_buffer\n");
546 goto error_set_urb_null;
547 }
548
549 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
550 intr->buffer, USB_MAX_EP_INT_BUFFER,
551 int_urb_complete, usb,
552 intr->interval);
553 urb->transfer_dma = intr->buffer_dma;
554 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
555
556 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
557 r = usb_submit_urb(urb, GFP_KERNEL);
558 if (r) {
559 dev_dbg_f(zd_usb_dev(usb),
560 "Couldn't submit urb. Error number %d\n", r);
561 goto error;
562 }
563
564 return 0;
565 error:
566 usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER,
567 intr->buffer, intr->buffer_dma);
568 error_set_urb_null:
569 spin_lock_irq(&intr->lock);
570 intr->urb = NULL;
571 spin_unlock_irq(&intr->lock);
572 error_free_urb:
573 usb_free_urb(urb);
574 out:
575 return r;
576 }
577
zd_usb_disable_int(struct zd_usb * usb)578 void zd_usb_disable_int(struct zd_usb *usb)
579 {
580 unsigned long flags;
581 struct usb_device *udev = zd_usb_to_usbdev(usb);
582 struct zd_usb_interrupt *intr = &usb->intr;
583 struct urb *urb;
584 void *buffer;
585 dma_addr_t buffer_dma;
586
587 spin_lock_irqsave(&intr->lock, flags);
588 urb = intr->urb;
589 if (!urb) {
590 spin_unlock_irqrestore(&intr->lock, flags);
591 return;
592 }
593 intr->urb = NULL;
594 buffer = intr->buffer;
595 buffer_dma = intr->buffer_dma;
596 intr->buffer = NULL;
597 spin_unlock_irqrestore(&intr->lock, flags);
598
599 usb_kill_urb(urb);
600 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
601 usb_free_urb(urb);
602
603 if (buffer)
604 usb_free_coherent(udev, USB_MAX_EP_INT_BUFFER,
605 buffer, buffer_dma);
606 }
607
handle_rx_packet(struct zd_usb * usb,const u8 * buffer,unsigned int length)608 static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
609 unsigned int length)
610 {
611 int i;
612 const struct rx_length_info *length_info;
613
614 if (length < sizeof(struct rx_length_info)) {
615 /* It's not a complete packet anyhow. */
616 dev_dbg_f(zd_usb_dev(usb), "invalid, small RX packet : %d\n",
617 length);
618 return;
619 }
620 length_info = (struct rx_length_info *)
621 (buffer + length - sizeof(struct rx_length_info));
622
623 /* It might be that three frames are merged into a single URB
624 * transaction. We have to check for the length info tag.
625 *
626 * While testing we discovered that length_info might be unaligned,
627 * because if USB transactions are merged, the last packet will not
628 * be padded. Unaligned access might also happen if the length_info
629 * structure is not present.
630 */
631 if (get_unaligned_le16(&length_info->tag) == RX_LENGTH_INFO_TAG)
632 {
633 unsigned int l, k, n;
634 for (i = 0, l = 0;; i++) {
635 k = get_unaligned_le16(&length_info->length[i]);
636 if (k == 0)
637 return;
638 n = l+k;
639 if (n > length)
640 return;
641 zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
642 if (i >= 2)
643 return;
644 l = (n+3) & ~3;
645 }
646 } else {
647 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
648 }
649 }
650
rx_urb_complete(struct urb * urb)651 static void rx_urb_complete(struct urb *urb)
652 {
653 int r;
654 struct zd_usb *usb;
655 struct zd_usb_rx *rx;
656 const u8 *buffer;
657 unsigned int length;
658 unsigned long flags;
659
660 switch (urb->status) {
661 case 0:
662 break;
663 case -ESHUTDOWN:
664 case -EINVAL:
665 case -ENODEV:
666 case -ENOENT:
667 case -ECONNRESET:
668 case -EPIPE:
669 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
670 return;
671 default:
672 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
673 goto resubmit;
674 }
675
676 buffer = urb->transfer_buffer;
677 length = urb->actual_length;
678 usb = urb->context;
679 rx = &usb->rx;
680
681 tasklet_schedule(&rx->reset_timer_tasklet);
682
683 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
684 /* If there is an old first fragment, we don't care. */
685 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
686 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
687 spin_lock_irqsave(&rx->lock, flags);
688 memcpy(rx->fragment, buffer, length);
689 rx->fragment_length = length;
690 spin_unlock_irqrestore(&rx->lock, flags);
691 goto resubmit;
692 }
693
694 spin_lock_irqsave(&rx->lock, flags);
695 if (rx->fragment_length > 0) {
696 /* We are on a second fragment, we believe */
697 ZD_ASSERT(length + rx->fragment_length <=
698 ARRAY_SIZE(rx->fragment));
699 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
700 memcpy(rx->fragment+rx->fragment_length, buffer, length);
701 handle_rx_packet(usb, rx->fragment,
702 rx->fragment_length + length);
703 rx->fragment_length = 0;
704 spin_unlock_irqrestore(&rx->lock, flags);
705 } else {
706 spin_unlock_irqrestore(&rx->lock, flags);
707 handle_rx_packet(usb, buffer, length);
708 }
709
710 resubmit:
711 r = usb_submit_urb(urb, GFP_ATOMIC);
712 if (r)
713 dev_dbg_f(urb_dev(urb), "urb %p resubmit error %d\n", urb, r);
714 }
715
alloc_rx_urb(struct zd_usb * usb)716 static struct urb *alloc_rx_urb(struct zd_usb *usb)
717 {
718 struct usb_device *udev = zd_usb_to_usbdev(usb);
719 struct urb *urb;
720 void *buffer;
721
722 urb = usb_alloc_urb(0, GFP_KERNEL);
723 if (!urb)
724 return NULL;
725 buffer = usb_alloc_coherent(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
726 &urb->transfer_dma);
727 if (!buffer) {
728 usb_free_urb(urb);
729 return NULL;
730 }
731
732 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
733 buffer, USB_MAX_RX_SIZE,
734 rx_urb_complete, usb);
735 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
736
737 return urb;
738 }
739
free_rx_urb(struct urb * urb)740 static void free_rx_urb(struct urb *urb)
741 {
742 if (!urb)
743 return;
744 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
745 urb->transfer_buffer, urb->transfer_dma);
746 usb_free_urb(urb);
747 }
748
__zd_usb_enable_rx(struct zd_usb * usb)749 static int __zd_usb_enable_rx(struct zd_usb *usb)
750 {
751 int i, r;
752 struct zd_usb_rx *rx = &usb->rx;
753 struct urb **urbs;
754
755 dev_dbg_f(zd_usb_dev(usb), "\n");
756
757 r = -ENOMEM;
758 urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
759 if (!urbs)
760 goto error;
761 for (i = 0; i < RX_URBS_COUNT; i++) {
762 urbs[i] = alloc_rx_urb(usb);
763 if (!urbs[i])
764 goto error;
765 }
766
767 ZD_ASSERT(!irqs_disabled());
768 spin_lock_irq(&rx->lock);
769 if (rx->urbs) {
770 spin_unlock_irq(&rx->lock);
771 r = 0;
772 goto error;
773 }
774 rx->urbs = urbs;
775 rx->urbs_count = RX_URBS_COUNT;
776 spin_unlock_irq(&rx->lock);
777
778 for (i = 0; i < RX_URBS_COUNT; i++) {
779 r = usb_submit_urb(urbs[i], GFP_KERNEL);
780 if (r)
781 goto error_submit;
782 }
783
784 return 0;
785 error_submit:
786 for (i = 0; i < RX_URBS_COUNT; i++) {
787 usb_kill_urb(urbs[i]);
788 }
789 spin_lock_irq(&rx->lock);
790 rx->urbs = NULL;
791 rx->urbs_count = 0;
792 spin_unlock_irq(&rx->lock);
793 error:
794 if (urbs) {
795 for (i = 0; i < RX_URBS_COUNT; i++)
796 free_rx_urb(urbs[i]);
797 }
798 return r;
799 }
800
zd_usb_enable_rx(struct zd_usb * usb)801 int zd_usb_enable_rx(struct zd_usb *usb)
802 {
803 int r;
804 struct zd_usb_rx *rx = &usb->rx;
805
806 mutex_lock(&rx->setup_mutex);
807 r = __zd_usb_enable_rx(usb);
808 mutex_unlock(&rx->setup_mutex);
809
810 zd_usb_reset_rx_idle_timer(usb);
811
812 return r;
813 }
814
__zd_usb_disable_rx(struct zd_usb * usb)815 static void __zd_usb_disable_rx(struct zd_usb *usb)
816 {
817 int i;
818 unsigned long flags;
819 struct urb **urbs;
820 unsigned int count;
821 struct zd_usb_rx *rx = &usb->rx;
822
823 spin_lock_irqsave(&rx->lock, flags);
824 urbs = rx->urbs;
825 count = rx->urbs_count;
826 spin_unlock_irqrestore(&rx->lock, flags);
827 if (!urbs)
828 return;
829
830 for (i = 0; i < count; i++) {
831 usb_kill_urb(urbs[i]);
832 free_rx_urb(urbs[i]);
833 }
834 kfree(urbs);
835
836 spin_lock_irqsave(&rx->lock, flags);
837 rx->urbs = NULL;
838 rx->urbs_count = 0;
839 spin_unlock_irqrestore(&rx->lock, flags);
840 }
841
zd_usb_disable_rx(struct zd_usb * usb)842 void zd_usb_disable_rx(struct zd_usb *usb)
843 {
844 struct zd_usb_rx *rx = &usb->rx;
845
846 mutex_lock(&rx->setup_mutex);
847 __zd_usb_disable_rx(usb);
848 mutex_unlock(&rx->setup_mutex);
849
850 tasklet_kill(&rx->reset_timer_tasklet);
851 cancel_delayed_work_sync(&rx->idle_work);
852 }
853
zd_usb_reset_rx(struct zd_usb * usb)854 static void zd_usb_reset_rx(struct zd_usb *usb)
855 {
856 bool do_reset;
857 struct zd_usb_rx *rx = &usb->rx;
858 unsigned long flags;
859
860 mutex_lock(&rx->setup_mutex);
861
862 spin_lock_irqsave(&rx->lock, flags);
863 do_reset = rx->urbs != NULL;
864 spin_unlock_irqrestore(&rx->lock, flags);
865
866 if (do_reset) {
867 __zd_usb_disable_rx(usb);
868 __zd_usb_enable_rx(usb);
869 }
870
871 mutex_unlock(&rx->setup_mutex);
872
873 if (do_reset)
874 zd_usb_reset_rx_idle_timer(usb);
875 }
876
877 /**
878 * zd_usb_disable_tx - disable transmission
879 * @usb: the zd1211rw-private USB structure
880 *
881 * Frees all URBs in the free list and marks the transmission as disabled.
882 */
zd_usb_disable_tx(struct zd_usb * usb)883 void zd_usb_disable_tx(struct zd_usb *usb)
884 {
885 struct zd_usb_tx *tx = &usb->tx;
886 unsigned long flags;
887
888 atomic_set(&tx->enabled, 0);
889
890 /* kill all submitted tx-urbs */
891 usb_kill_anchored_urbs(&tx->submitted);
892
893 spin_lock_irqsave(&tx->lock, flags);
894 WARN_ON(!skb_queue_empty(&tx->submitted_skbs));
895 WARN_ON(tx->submitted_urbs != 0);
896 tx->submitted_urbs = 0;
897 spin_unlock_irqrestore(&tx->lock, flags);
898
899 /* The stopped state is ignored, relying on ieee80211_wake_queues()
900 * in a potentionally following zd_usb_enable_tx().
901 */
902 }
903
904 /**
905 * zd_usb_enable_tx - enables transmission
906 * @usb: a &struct zd_usb pointer
907 *
908 * This function enables transmission and prepares the &zd_usb_tx data
909 * structure.
910 */
zd_usb_enable_tx(struct zd_usb * usb)911 void zd_usb_enable_tx(struct zd_usb *usb)
912 {
913 unsigned long flags;
914 struct zd_usb_tx *tx = &usb->tx;
915
916 spin_lock_irqsave(&tx->lock, flags);
917 atomic_set(&tx->enabled, 1);
918 tx->submitted_urbs = 0;
919 ieee80211_wake_queues(zd_usb_to_hw(usb));
920 tx->stopped = 0;
921 spin_unlock_irqrestore(&tx->lock, flags);
922 }
923
tx_dec_submitted_urbs(struct zd_usb * usb)924 static void tx_dec_submitted_urbs(struct zd_usb *usb)
925 {
926 struct zd_usb_tx *tx = &usb->tx;
927 unsigned long flags;
928
929 spin_lock_irqsave(&tx->lock, flags);
930 --tx->submitted_urbs;
931 if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
932 ieee80211_wake_queues(zd_usb_to_hw(usb));
933 tx->stopped = 0;
934 }
935 spin_unlock_irqrestore(&tx->lock, flags);
936 }
937
tx_inc_submitted_urbs(struct zd_usb * usb)938 static void tx_inc_submitted_urbs(struct zd_usb *usb)
939 {
940 struct zd_usb_tx *tx = &usb->tx;
941 unsigned long flags;
942
943 spin_lock_irqsave(&tx->lock, flags);
944 ++tx->submitted_urbs;
945 if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
946 ieee80211_stop_queues(zd_usb_to_hw(usb));
947 tx->stopped = 1;
948 }
949 spin_unlock_irqrestore(&tx->lock, flags);
950 }
951
952 /**
953 * tx_urb_complete - completes the execution of an URB
954 * @urb: a URB
955 *
956 * This function is called if the URB has been transferred to a device or an
957 * error has happened.
958 */
tx_urb_complete(struct urb * urb)959 static void tx_urb_complete(struct urb *urb)
960 {
961 int r;
962 struct sk_buff *skb;
963 struct ieee80211_tx_info *info;
964 struct zd_usb *usb;
965 struct zd_usb_tx *tx;
966
967 skb = (struct sk_buff *)urb->context;
968 info = IEEE80211_SKB_CB(skb);
969 /*
970 * grab 'usb' pointer before handing off the skb (since
971 * it might be freed by zd_mac_tx_to_dev or mac80211)
972 */
973 usb = &zd_hw_mac(info->rate_driver_data[0])->chip.usb;
974 tx = &usb->tx;
975
976 switch (urb->status) {
977 case 0:
978 break;
979 case -ESHUTDOWN:
980 case -EINVAL:
981 case -ENODEV:
982 case -ENOENT:
983 case -ECONNRESET:
984 case -EPIPE:
985 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
986 break;
987 default:
988 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
989 goto resubmit;
990 }
991 free_urb:
992 skb_unlink(skb, &usb->tx.submitted_skbs);
993 zd_mac_tx_to_dev(skb, urb->status);
994 usb_free_urb(urb);
995 tx_dec_submitted_urbs(usb);
996 return;
997 resubmit:
998 usb_anchor_urb(urb, &tx->submitted);
999 r = usb_submit_urb(urb, GFP_ATOMIC);
1000 if (r) {
1001 usb_unanchor_urb(urb);
1002 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
1003 goto free_urb;
1004 }
1005 }
1006
1007 /**
1008 * zd_usb_tx: initiates transfer of a frame of the device
1009 *
1010 * @usb: the zd1211rw-private USB structure
1011 * @skb: a &struct sk_buff pointer
1012 *
1013 * This function tranmits a frame to the device. It doesn't wait for
1014 * completion. The frame must contain the control set and have all the
1015 * control set information available.
1016 *
1017 * The function returns 0 if the transfer has been successfully initiated.
1018 */
zd_usb_tx(struct zd_usb * usb,struct sk_buff * skb)1019 int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
1020 {
1021 int r;
1022 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1023 struct usb_device *udev = zd_usb_to_usbdev(usb);
1024 struct urb *urb;
1025 struct zd_usb_tx *tx = &usb->tx;
1026
1027 if (!atomic_read(&tx->enabled)) {
1028 r = -ENOENT;
1029 goto out;
1030 }
1031
1032 urb = usb_alloc_urb(0, GFP_ATOMIC);
1033 if (!urb) {
1034 r = -ENOMEM;
1035 goto out;
1036 }
1037
1038 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
1039 skb->data, skb->len, tx_urb_complete, skb);
1040
1041 info->rate_driver_data[1] = (void *)jiffies;
1042 skb_queue_tail(&tx->submitted_skbs, skb);
1043 usb_anchor_urb(urb, &tx->submitted);
1044
1045 r = usb_submit_urb(urb, GFP_ATOMIC);
1046 if (r) {
1047 dev_dbg_f(zd_usb_dev(usb), "error submit urb %p %d\n", urb, r);
1048 usb_unanchor_urb(urb);
1049 skb_unlink(skb, &tx->submitted_skbs);
1050 goto error;
1051 }
1052 tx_inc_submitted_urbs(usb);
1053 return 0;
1054 error:
1055 usb_free_urb(urb);
1056 out:
1057 return r;
1058 }
1059
zd_tx_timeout(struct zd_usb * usb)1060 static bool zd_tx_timeout(struct zd_usb *usb)
1061 {
1062 struct zd_usb_tx *tx = &usb->tx;
1063 struct sk_buff_head *q = &tx->submitted_skbs;
1064 struct sk_buff *skb, *skbnext;
1065 struct ieee80211_tx_info *info;
1066 unsigned long flags, trans_start;
1067 bool have_timedout = false;
1068
1069 spin_lock_irqsave(&q->lock, flags);
1070 skb_queue_walk_safe(q, skb, skbnext) {
1071 info = IEEE80211_SKB_CB(skb);
1072 trans_start = (unsigned long)info->rate_driver_data[1];
1073
1074 if (time_is_before_jiffies(trans_start + ZD_TX_TIMEOUT)) {
1075 have_timedout = true;
1076 break;
1077 }
1078 }
1079 spin_unlock_irqrestore(&q->lock, flags);
1080
1081 return have_timedout;
1082 }
1083
zd_tx_watchdog_handler(struct work_struct * work)1084 static void zd_tx_watchdog_handler(struct work_struct *work)
1085 {
1086 struct zd_usb *usb =
1087 container_of(work, struct zd_usb, tx.watchdog_work.work);
1088 struct zd_usb_tx *tx = &usb->tx;
1089
1090 if (!atomic_read(&tx->enabled) || !tx->watchdog_enabled)
1091 goto out;
1092 if (!zd_tx_timeout(usb))
1093 goto out;
1094
1095 /* TX halted, try reset */
1096 dev_warn(zd_usb_dev(usb), "TX-stall detected, resetting device...");
1097
1098 usb_queue_reset_device(usb->intf);
1099
1100 /* reset will stop this worker, don't rearm */
1101 return;
1102 out:
1103 queue_delayed_work(zd_workqueue, &tx->watchdog_work,
1104 ZD_TX_WATCHDOG_INTERVAL);
1105 }
1106
zd_tx_watchdog_enable(struct zd_usb * usb)1107 void zd_tx_watchdog_enable(struct zd_usb *usb)
1108 {
1109 struct zd_usb_tx *tx = &usb->tx;
1110
1111 if (!tx->watchdog_enabled) {
1112 dev_dbg_f(zd_usb_dev(usb), "\n");
1113 queue_delayed_work(zd_workqueue, &tx->watchdog_work,
1114 ZD_TX_WATCHDOG_INTERVAL);
1115 tx->watchdog_enabled = 1;
1116 }
1117 }
1118
zd_tx_watchdog_disable(struct zd_usb * usb)1119 void zd_tx_watchdog_disable(struct zd_usb *usb)
1120 {
1121 struct zd_usb_tx *tx = &usb->tx;
1122
1123 if (tx->watchdog_enabled) {
1124 dev_dbg_f(zd_usb_dev(usb), "\n");
1125 tx->watchdog_enabled = 0;
1126 cancel_delayed_work_sync(&tx->watchdog_work);
1127 }
1128 }
1129
zd_rx_idle_timer_handler(struct work_struct * work)1130 static void zd_rx_idle_timer_handler(struct work_struct *work)
1131 {
1132 struct zd_usb *usb =
1133 container_of(work, struct zd_usb, rx.idle_work.work);
1134 struct zd_mac *mac = zd_usb_to_mac(usb);
1135
1136 if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags))
1137 return;
1138
1139 dev_dbg_f(zd_usb_dev(usb), "\n");
1140
1141 /* 30 seconds since last rx, reset rx */
1142 zd_usb_reset_rx(usb);
1143 }
1144
zd_usb_reset_rx_idle_timer_tasklet(unsigned long param)1145 static void zd_usb_reset_rx_idle_timer_tasklet(unsigned long param)
1146 {
1147 struct zd_usb *usb = (struct zd_usb *)param;
1148
1149 zd_usb_reset_rx_idle_timer(usb);
1150 }
1151
zd_usb_reset_rx_idle_timer(struct zd_usb * usb)1152 void zd_usb_reset_rx_idle_timer(struct zd_usb *usb)
1153 {
1154 struct zd_usb_rx *rx = &usb->rx;
1155
1156 mod_delayed_work(zd_workqueue, &rx->idle_work, ZD_RX_IDLE_INTERVAL);
1157 }
1158
init_usb_interrupt(struct zd_usb * usb)1159 static inline void init_usb_interrupt(struct zd_usb *usb)
1160 {
1161 struct zd_usb_interrupt *intr = &usb->intr;
1162
1163 spin_lock_init(&intr->lock);
1164 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
1165 init_completion(&intr->read_regs.completion);
1166 atomic_set(&intr->read_regs_enabled, 0);
1167 intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
1168 }
1169
init_usb_rx(struct zd_usb * usb)1170 static inline void init_usb_rx(struct zd_usb *usb)
1171 {
1172 struct zd_usb_rx *rx = &usb->rx;
1173
1174 spin_lock_init(&rx->lock);
1175 mutex_init(&rx->setup_mutex);
1176 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
1177 rx->usb_packet_size = 512;
1178 } else {
1179 rx->usb_packet_size = 64;
1180 }
1181 ZD_ASSERT(rx->fragment_length == 0);
1182 INIT_DELAYED_WORK(&rx->idle_work, zd_rx_idle_timer_handler);
1183 rx->reset_timer_tasklet.func = zd_usb_reset_rx_idle_timer_tasklet;
1184 rx->reset_timer_tasklet.data = (unsigned long)usb;
1185 }
1186
init_usb_tx(struct zd_usb * usb)1187 static inline void init_usb_tx(struct zd_usb *usb)
1188 {
1189 struct zd_usb_tx *tx = &usb->tx;
1190
1191 spin_lock_init(&tx->lock);
1192 atomic_set(&tx->enabled, 0);
1193 tx->stopped = 0;
1194 skb_queue_head_init(&tx->submitted_skbs);
1195 init_usb_anchor(&tx->submitted);
1196 tx->submitted_urbs = 0;
1197 tx->watchdog_enabled = 0;
1198 INIT_DELAYED_WORK(&tx->watchdog_work, zd_tx_watchdog_handler);
1199 }
1200
zd_usb_init(struct zd_usb * usb,struct ieee80211_hw * hw,struct usb_interface * intf)1201 void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
1202 struct usb_interface *intf)
1203 {
1204 memset(usb, 0, sizeof(*usb));
1205 usb->intf = usb_get_intf(intf);
1206 usb_set_intfdata(usb->intf, hw);
1207 init_usb_anchor(&usb->submitted_cmds);
1208 init_usb_interrupt(usb);
1209 init_usb_tx(usb);
1210 init_usb_rx(usb);
1211 }
1212
zd_usb_clear(struct zd_usb * usb)1213 void zd_usb_clear(struct zd_usb *usb)
1214 {
1215 usb_set_intfdata(usb->intf, NULL);
1216 usb_put_intf(usb->intf);
1217 ZD_MEMCLEAR(usb, sizeof(*usb));
1218 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
1219 }
1220
speed(enum usb_device_speed speed)1221 static const char *speed(enum usb_device_speed speed)
1222 {
1223 switch (speed) {
1224 case USB_SPEED_LOW:
1225 return "low";
1226 case USB_SPEED_FULL:
1227 return "full";
1228 case USB_SPEED_HIGH:
1229 return "high";
1230 default:
1231 return "unknown speed";
1232 }
1233 }
1234
scnprint_id(struct usb_device * udev,char * buffer,size_t size)1235 static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
1236 {
1237 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1238 le16_to_cpu(udev->descriptor.idVendor),
1239 le16_to_cpu(udev->descriptor.idProduct),
1240 get_bcdDevice(udev),
1241 speed(udev->speed));
1242 }
1243
zd_usb_scnprint_id(struct zd_usb * usb,char * buffer,size_t size)1244 int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1245 {
1246 struct usb_device *udev = interface_to_usbdev(usb->intf);
1247 return scnprint_id(udev, buffer, size);
1248 }
1249
1250 #ifdef DEBUG
print_id(struct usb_device * udev)1251 static void print_id(struct usb_device *udev)
1252 {
1253 char buffer[40];
1254
1255 scnprint_id(udev, buffer, sizeof(buffer));
1256 buffer[sizeof(buffer)-1] = 0;
1257 dev_dbg_f(&udev->dev, "%s\n", buffer);
1258 }
1259 #else
1260 #define print_id(udev) do { } while (0)
1261 #endif
1262
eject_installer(struct usb_interface * intf)1263 static int eject_installer(struct usb_interface *intf)
1264 {
1265 struct usb_device *udev = interface_to_usbdev(intf);
1266 struct usb_host_interface *iface_desc = &intf->altsetting[0];
1267 struct usb_endpoint_descriptor *endpoint;
1268 unsigned char *cmd;
1269 u8 bulk_out_ep;
1270 int r;
1271
1272 if (iface_desc->desc.bNumEndpoints < 2)
1273 return -ENODEV;
1274
1275 /* Find bulk out endpoint */
1276 for (r = 1; r >= 0; r--) {
1277 endpoint = &iface_desc->endpoint[r].desc;
1278 if (usb_endpoint_dir_out(endpoint) &&
1279 usb_endpoint_xfer_bulk(endpoint)) {
1280 bulk_out_ep = endpoint->bEndpointAddress;
1281 break;
1282 }
1283 }
1284 if (r == -1) {
1285 dev_err(&udev->dev,
1286 "zd1211rw: Could not find bulk out endpoint\n");
1287 return -ENODEV;
1288 }
1289
1290 cmd = kzalloc(31, GFP_KERNEL);
1291 if (cmd == NULL)
1292 return -ENODEV;
1293
1294 /* USB bulk command block */
1295 cmd[0] = 0x55; /* bulk command signature */
1296 cmd[1] = 0x53; /* bulk command signature */
1297 cmd[2] = 0x42; /* bulk command signature */
1298 cmd[3] = 0x43; /* bulk command signature */
1299 cmd[14] = 6; /* command length */
1300
1301 cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1302 cmd[19] = 0x2; /* eject disc */
1303
1304 dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1305 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1306 cmd, 31, NULL, 2000);
1307 kfree(cmd);
1308 if (r)
1309 return r;
1310
1311 /* At this point, the device disconnects and reconnects with the real
1312 * ID numbers. */
1313
1314 usb_set_intfdata(intf, NULL);
1315 return 0;
1316 }
1317
zd_usb_init_hw(struct zd_usb * usb)1318 int zd_usb_init_hw(struct zd_usb *usb)
1319 {
1320 int r;
1321 struct zd_mac *mac = zd_usb_to_mac(usb);
1322
1323 dev_dbg_f(zd_usb_dev(usb), "\n");
1324
1325 r = upload_firmware(usb);
1326 if (r) {
1327 dev_err(zd_usb_dev(usb),
1328 "couldn't load firmware. Error number %d\n", r);
1329 return r;
1330 }
1331
1332 r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1333 if (r) {
1334 dev_dbg_f(zd_usb_dev(usb),
1335 "couldn't reset configuration. Error number %d\n", r);
1336 return r;
1337 }
1338
1339 r = zd_mac_init_hw(mac->hw);
1340 if (r) {
1341 dev_dbg_f(zd_usb_dev(usb),
1342 "couldn't initialize mac. Error number %d\n", r);
1343 return r;
1344 }
1345
1346 usb->initialized = 1;
1347 return 0;
1348 }
1349
probe(struct usb_interface * intf,const struct usb_device_id * id)1350 static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1351 {
1352 int r;
1353 struct usb_device *udev = interface_to_usbdev(intf);
1354 struct zd_usb *usb;
1355 struct ieee80211_hw *hw = NULL;
1356
1357 print_id(udev);
1358
1359 if (id->driver_info & DEVICE_INSTALLER)
1360 return eject_installer(intf);
1361
1362 switch (udev->speed) {
1363 case USB_SPEED_LOW:
1364 case USB_SPEED_FULL:
1365 case USB_SPEED_HIGH:
1366 break;
1367 default:
1368 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1369 r = -ENODEV;
1370 goto error;
1371 }
1372
1373 r = usb_reset_device(udev);
1374 if (r) {
1375 dev_err(&intf->dev,
1376 "couldn't reset usb device. Error number %d\n", r);
1377 goto error;
1378 }
1379
1380 hw = zd_mac_alloc_hw(intf);
1381 if (hw == NULL) {
1382 r = -ENOMEM;
1383 goto error;
1384 }
1385
1386 usb = &zd_hw_mac(hw)->chip.usb;
1387 usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
1388
1389 r = zd_mac_preinit_hw(hw);
1390 if (r) {
1391 dev_dbg_f(&intf->dev,
1392 "couldn't initialize mac. Error number %d\n", r);
1393 goto error;
1394 }
1395
1396 r = ieee80211_register_hw(hw);
1397 if (r) {
1398 dev_dbg_f(&intf->dev,
1399 "couldn't register device. Error number %d\n", r);
1400 goto error;
1401 }
1402
1403 dev_dbg_f(&intf->dev, "successful\n");
1404 dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
1405 return 0;
1406 error:
1407 usb_reset_device(interface_to_usbdev(intf));
1408 if (hw) {
1409 zd_mac_clear(zd_hw_mac(hw));
1410 ieee80211_free_hw(hw);
1411 }
1412 return r;
1413 }
1414
disconnect(struct usb_interface * intf)1415 static void disconnect(struct usb_interface *intf)
1416 {
1417 struct ieee80211_hw *hw = zd_intf_to_hw(intf);
1418 struct zd_mac *mac;
1419 struct zd_usb *usb;
1420
1421 /* Either something really bad happened, or we're just dealing with
1422 * a DEVICE_INSTALLER. */
1423 if (hw == NULL)
1424 return;
1425
1426 mac = zd_hw_mac(hw);
1427 usb = &mac->chip.usb;
1428
1429 dev_dbg_f(zd_usb_dev(usb), "\n");
1430
1431 ieee80211_unregister_hw(hw);
1432
1433 /* Just in case something has gone wrong! */
1434 zd_usb_disable_tx(usb);
1435 zd_usb_disable_rx(usb);
1436 zd_usb_disable_int(usb);
1437
1438 /* If the disconnect has been caused by a removal of the
1439 * driver module, the reset allows reloading of the driver. If the
1440 * reset will not be executed here, the upload of the firmware in the
1441 * probe function caused by the reloading of the driver will fail.
1442 */
1443 usb_reset_device(interface_to_usbdev(intf));
1444
1445 zd_mac_clear(mac);
1446 ieee80211_free_hw(hw);
1447 dev_dbg(&intf->dev, "disconnected\n");
1448 }
1449
zd_usb_resume(struct zd_usb * usb)1450 static void zd_usb_resume(struct zd_usb *usb)
1451 {
1452 struct zd_mac *mac = zd_usb_to_mac(usb);
1453 int r;
1454
1455 dev_dbg_f(zd_usb_dev(usb), "\n");
1456
1457 r = zd_op_start(zd_usb_to_hw(usb));
1458 if (r < 0) {
1459 dev_warn(zd_usb_dev(usb), "Device resume failed "
1460 "with error code %d. Retrying...\n", r);
1461 if (usb->was_running)
1462 set_bit(ZD_DEVICE_RUNNING, &mac->flags);
1463 usb_queue_reset_device(usb->intf);
1464 return;
1465 }
1466
1467 if (mac->type != NL80211_IFTYPE_UNSPECIFIED) {
1468 r = zd_restore_settings(mac);
1469 if (r < 0) {
1470 dev_dbg(zd_usb_dev(usb),
1471 "failed to restore settings, %d\n", r);
1472 return;
1473 }
1474 }
1475 }
1476
zd_usb_stop(struct zd_usb * usb)1477 static void zd_usb_stop(struct zd_usb *usb)
1478 {
1479 dev_dbg_f(zd_usb_dev(usb), "\n");
1480
1481 zd_op_stop(zd_usb_to_hw(usb));
1482
1483 zd_usb_disable_tx(usb);
1484 zd_usb_disable_rx(usb);
1485 zd_usb_disable_int(usb);
1486
1487 usb->initialized = 0;
1488 }
1489
pre_reset(struct usb_interface * intf)1490 static int pre_reset(struct usb_interface *intf)
1491 {
1492 struct ieee80211_hw *hw = usb_get_intfdata(intf);
1493 struct zd_mac *mac;
1494 struct zd_usb *usb;
1495
1496 if (!hw || intf->condition != USB_INTERFACE_BOUND)
1497 return 0;
1498
1499 mac = zd_hw_mac(hw);
1500 usb = &mac->chip.usb;
1501
1502 usb->was_running = test_bit(ZD_DEVICE_RUNNING, &mac->flags);
1503
1504 zd_usb_stop(usb);
1505
1506 mutex_lock(&mac->chip.mutex);
1507 return 0;
1508 }
1509
post_reset(struct usb_interface * intf)1510 static int post_reset(struct usb_interface *intf)
1511 {
1512 struct ieee80211_hw *hw = usb_get_intfdata(intf);
1513 struct zd_mac *mac;
1514 struct zd_usb *usb;
1515
1516 if (!hw || intf->condition != USB_INTERFACE_BOUND)
1517 return 0;
1518
1519 mac = zd_hw_mac(hw);
1520 usb = &mac->chip.usb;
1521
1522 mutex_unlock(&mac->chip.mutex);
1523
1524 if (usb->was_running)
1525 zd_usb_resume(usb);
1526 return 0;
1527 }
1528
1529 static struct usb_driver driver = {
1530 .name = KBUILD_MODNAME,
1531 .id_table = usb_ids,
1532 .probe = probe,
1533 .disconnect = disconnect,
1534 .pre_reset = pre_reset,
1535 .post_reset = post_reset,
1536 .disable_hub_initiated_lpm = 1,
1537 };
1538
1539 struct workqueue_struct *zd_workqueue;
1540
usb_init(void)1541 static int __init usb_init(void)
1542 {
1543 int r;
1544
1545 pr_debug("%s usb_init()\n", driver.name);
1546
1547 zd_workqueue = create_singlethread_workqueue(driver.name);
1548 if (zd_workqueue == NULL) {
1549 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
1550 return -ENOMEM;
1551 }
1552
1553 r = usb_register(&driver);
1554 if (r) {
1555 destroy_workqueue(zd_workqueue);
1556 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1557 driver.name, r);
1558 return r;
1559 }
1560
1561 pr_debug("%s initialized\n", driver.name);
1562 return 0;
1563 }
1564
usb_exit(void)1565 static void __exit usb_exit(void)
1566 {
1567 pr_debug("%s usb_exit()\n", driver.name);
1568 usb_deregister(&driver);
1569 destroy_workqueue(zd_workqueue);
1570 }
1571
1572 module_init(usb_init);
1573 module_exit(usb_exit);
1574
zd_ep_regs_out_msg(struct usb_device * udev,void * data,int len,int * actual_length,int timeout)1575 static int zd_ep_regs_out_msg(struct usb_device *udev, void *data, int len,
1576 int *actual_length, int timeout)
1577 {
1578 /* In USB 2.0 mode EP_REGS_OUT endpoint is interrupt type. However in
1579 * USB 1.1 mode endpoint is bulk. Select correct type URB by endpoint
1580 * descriptor.
1581 */
1582 struct usb_host_endpoint *ep;
1583 unsigned int pipe;
1584
1585 pipe = usb_sndintpipe(udev, EP_REGS_OUT);
1586 ep = usb_pipe_endpoint(udev, pipe);
1587 if (!ep)
1588 return -EINVAL;
1589
1590 if (usb_endpoint_xfer_int(&ep->desc)) {
1591 return usb_interrupt_msg(udev, pipe, data, len,
1592 actual_length, timeout);
1593 } else {
1594 pipe = usb_sndbulkpipe(udev, EP_REGS_OUT);
1595 return usb_bulk_msg(udev, pipe, data, len, actual_length,
1596 timeout);
1597 }
1598 }
1599
prepare_read_regs_int(struct zd_usb * usb,struct usb_req_read_regs * req,unsigned int count)1600 static void prepare_read_regs_int(struct zd_usb *usb,
1601 struct usb_req_read_regs *req,
1602 unsigned int count)
1603 {
1604 struct zd_usb_interrupt *intr = &usb->intr;
1605
1606 spin_lock_irq(&intr->lock);
1607 atomic_set(&intr->read_regs_enabled, 1);
1608 intr->read_regs.req = req;
1609 intr->read_regs.req_count = count;
1610 reinit_completion(&intr->read_regs.completion);
1611 spin_unlock_irq(&intr->lock);
1612 }
1613
disable_read_regs_int(struct zd_usb * usb)1614 static void disable_read_regs_int(struct zd_usb *usb)
1615 {
1616 struct zd_usb_interrupt *intr = &usb->intr;
1617
1618 spin_lock_irq(&intr->lock);
1619 atomic_set(&intr->read_regs_enabled, 0);
1620 spin_unlock_irq(&intr->lock);
1621 }
1622
check_read_regs(struct zd_usb * usb,struct usb_req_read_regs * req,unsigned int count)1623 static bool check_read_regs(struct zd_usb *usb, struct usb_req_read_regs *req,
1624 unsigned int count)
1625 {
1626 int i;
1627 struct zd_usb_interrupt *intr = &usb->intr;
1628 struct read_regs_int *rr = &intr->read_regs;
1629 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1630
1631 /* The created block size seems to be larger than expected.
1632 * However results appear to be correct.
1633 */
1634 if (rr->length < struct_size(regs, regs, count)) {
1635 dev_dbg_f(zd_usb_dev(usb),
1636 "error: actual length %d less than expected %zu\n",
1637 rr->length, struct_size(regs, regs, count));
1638 return false;
1639 }
1640
1641 if (rr->length > sizeof(rr->buffer)) {
1642 dev_dbg_f(zd_usb_dev(usb),
1643 "error: actual length %d exceeds buffer size %zu\n",
1644 rr->length, sizeof(rr->buffer));
1645 return false;
1646 }
1647
1648 for (i = 0; i < count; i++) {
1649 struct reg_data *rd = ®s->regs[i];
1650 if (rd->addr != req->addr[i]) {
1651 dev_dbg_f(zd_usb_dev(usb),
1652 "rd[%d] addr %#06hx expected %#06hx\n", i,
1653 le16_to_cpu(rd->addr),
1654 le16_to_cpu(req->addr[i]));
1655 return false;
1656 }
1657 }
1658
1659 return true;
1660 }
1661
get_results(struct zd_usb * usb,u16 * values,struct usb_req_read_regs * req,unsigned int count,bool * retry)1662 static int get_results(struct zd_usb *usb, u16 *values,
1663 struct usb_req_read_regs *req, unsigned int count,
1664 bool *retry)
1665 {
1666 int r;
1667 int i;
1668 struct zd_usb_interrupt *intr = &usb->intr;
1669 struct read_regs_int *rr = &intr->read_regs;
1670 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1671
1672 spin_lock_irq(&intr->lock);
1673
1674 r = -EIO;
1675
1676 /* Read failed because firmware bug? */
1677 *retry = !!intr->read_regs_int_overridden;
1678 if (*retry)
1679 goto error_unlock;
1680
1681 if (!check_read_regs(usb, req, count)) {
1682 dev_dbg_f(zd_usb_dev(usb), "error: invalid read regs\n");
1683 goto error_unlock;
1684 }
1685
1686 for (i = 0; i < count; i++) {
1687 struct reg_data *rd = ®s->regs[i];
1688 values[i] = le16_to_cpu(rd->value);
1689 }
1690
1691 r = 0;
1692 error_unlock:
1693 spin_unlock_irq(&intr->lock);
1694 return r;
1695 }
1696
zd_usb_ioread16v(struct zd_usb * usb,u16 * values,const zd_addr_t * addresses,unsigned int count)1697 int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1698 const zd_addr_t *addresses, unsigned int count)
1699 {
1700 int r, i, req_len, actual_req_len, try_count = 0;
1701 struct usb_device *udev;
1702 struct usb_req_read_regs *req = NULL;
1703 unsigned long timeout;
1704 bool retry = false;
1705
1706 if (count < 1) {
1707 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1708 return -EINVAL;
1709 }
1710 if (count > USB_MAX_IOREAD16_COUNT) {
1711 dev_dbg_f(zd_usb_dev(usb),
1712 "error: count %u exceeds possible max %u\n",
1713 count, USB_MAX_IOREAD16_COUNT);
1714 return -EINVAL;
1715 }
1716 if (in_atomic()) {
1717 dev_dbg_f(zd_usb_dev(usb),
1718 "error: io in atomic context not supported\n");
1719 return -EWOULDBLOCK;
1720 }
1721 if (!usb_int_enabled(usb)) {
1722 dev_dbg_f(zd_usb_dev(usb),
1723 "error: usb interrupt not enabled\n");
1724 return -EWOULDBLOCK;
1725 }
1726
1727 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1728 BUILD_BUG_ON(sizeof(struct usb_req_read_regs) + USB_MAX_IOREAD16_COUNT *
1729 sizeof(__le16) > sizeof(usb->req_buf));
1730 BUG_ON(sizeof(struct usb_req_read_regs) + count * sizeof(__le16) >
1731 sizeof(usb->req_buf));
1732
1733 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
1734 req = (void *)usb->req_buf;
1735
1736 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1737 for (i = 0; i < count; i++)
1738 req->addr[i] = cpu_to_le16((u16)addresses[i]);
1739
1740 retry_read:
1741 try_count++;
1742 udev = zd_usb_to_usbdev(usb);
1743 prepare_read_regs_int(usb, req, count);
1744 r = zd_ep_regs_out_msg(udev, req, req_len, &actual_req_len, 50 /*ms*/);
1745 if (r) {
1746 dev_dbg_f(zd_usb_dev(usb),
1747 "error in zd_ep_regs_out_msg(). Error number %d\n", r);
1748 goto error;
1749 }
1750 if (req_len != actual_req_len) {
1751 dev_dbg_f(zd_usb_dev(usb), "error in zd_ep_regs_out_msg()\n"
1752 " req_len %d != actual_req_len %d\n",
1753 req_len, actual_req_len);
1754 r = -EIO;
1755 goto error;
1756 }
1757
1758 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1759 msecs_to_jiffies(50));
1760 if (!timeout) {
1761 disable_read_regs_int(usb);
1762 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1763 r = -ETIMEDOUT;
1764 goto error;
1765 }
1766
1767 r = get_results(usb, values, req, count, &retry);
1768 if (retry && try_count < 20) {
1769 dev_dbg_f(zd_usb_dev(usb), "read retry, tries so far: %d\n",
1770 try_count);
1771 goto retry_read;
1772 }
1773 error:
1774 return r;
1775 }
1776
iowrite16v_urb_complete(struct urb * urb)1777 static void iowrite16v_urb_complete(struct urb *urb)
1778 {
1779 struct zd_usb *usb = urb->context;
1780
1781 if (urb->status && !usb->cmd_error)
1782 usb->cmd_error = urb->status;
1783
1784 if (!usb->cmd_error &&
1785 urb->actual_length != urb->transfer_buffer_length)
1786 usb->cmd_error = -EIO;
1787 }
1788
zd_submit_waiting_urb(struct zd_usb * usb,bool last)1789 static int zd_submit_waiting_urb(struct zd_usb *usb, bool last)
1790 {
1791 int r = 0;
1792 struct urb *urb = usb->urb_async_waiting;
1793
1794 if (!urb)
1795 return 0;
1796
1797 usb->urb_async_waiting = NULL;
1798
1799 if (!last)
1800 urb->transfer_flags |= URB_NO_INTERRUPT;
1801
1802 usb_anchor_urb(urb, &usb->submitted_cmds);
1803 r = usb_submit_urb(urb, GFP_KERNEL);
1804 if (r) {
1805 usb_unanchor_urb(urb);
1806 dev_dbg_f(zd_usb_dev(usb),
1807 "error in usb_submit_urb(). Error number %d\n", r);
1808 goto error;
1809 }
1810
1811 /* fall-through with r == 0 */
1812 error:
1813 usb_free_urb(urb);
1814 return r;
1815 }
1816
zd_usb_iowrite16v_async_start(struct zd_usb * usb)1817 void zd_usb_iowrite16v_async_start(struct zd_usb *usb)
1818 {
1819 ZD_ASSERT(usb_anchor_empty(&usb->submitted_cmds));
1820 ZD_ASSERT(usb->urb_async_waiting == NULL);
1821 ZD_ASSERT(!usb->in_async);
1822
1823 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1824
1825 usb->in_async = 1;
1826 usb->cmd_error = 0;
1827 usb->urb_async_waiting = NULL;
1828 }
1829
zd_usb_iowrite16v_async_end(struct zd_usb * usb,unsigned int timeout)1830 int zd_usb_iowrite16v_async_end(struct zd_usb *usb, unsigned int timeout)
1831 {
1832 int r;
1833
1834 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1835 ZD_ASSERT(usb->in_async);
1836
1837 /* Submit last iowrite16v URB */
1838 r = zd_submit_waiting_urb(usb, true);
1839 if (r) {
1840 dev_dbg_f(zd_usb_dev(usb),
1841 "error in zd_submit_waiting_usb(). "
1842 "Error number %d\n", r);
1843
1844 usb_kill_anchored_urbs(&usb->submitted_cmds);
1845 goto error;
1846 }
1847
1848 if (timeout)
1849 timeout = usb_wait_anchor_empty_timeout(&usb->submitted_cmds,
1850 timeout);
1851 if (!timeout) {
1852 usb_kill_anchored_urbs(&usb->submitted_cmds);
1853 if (usb->cmd_error == -ENOENT) {
1854 dev_dbg_f(zd_usb_dev(usb), "timed out");
1855 r = -ETIMEDOUT;
1856 goto error;
1857 }
1858 }
1859
1860 r = usb->cmd_error;
1861 error:
1862 usb->in_async = 0;
1863 return r;
1864 }
1865
zd_usb_iowrite16v_async(struct zd_usb * usb,const struct zd_ioreq16 * ioreqs,unsigned int count)1866 int zd_usb_iowrite16v_async(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1867 unsigned int count)
1868 {
1869 int r;
1870 struct usb_device *udev;
1871 struct usb_req_write_regs *req = NULL;
1872 int i, req_len;
1873 struct urb *urb;
1874 struct usb_host_endpoint *ep;
1875
1876 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
1877 ZD_ASSERT(usb->in_async);
1878
1879 if (count == 0)
1880 return 0;
1881 if (count > USB_MAX_IOWRITE16_COUNT) {
1882 dev_dbg_f(zd_usb_dev(usb),
1883 "error: count %u exceeds possible max %u\n",
1884 count, USB_MAX_IOWRITE16_COUNT);
1885 return -EINVAL;
1886 }
1887 if (in_atomic()) {
1888 dev_dbg_f(zd_usb_dev(usb),
1889 "error: io in atomic context not supported\n");
1890 return -EWOULDBLOCK;
1891 }
1892
1893 udev = zd_usb_to_usbdev(usb);
1894
1895 ep = usb_pipe_endpoint(udev, usb_sndintpipe(udev, EP_REGS_OUT));
1896 if (!ep)
1897 return -ENOENT;
1898
1899 urb = usb_alloc_urb(0, GFP_KERNEL);
1900 if (!urb)
1901 return -ENOMEM;
1902
1903 req_len = struct_size(req, reg_writes, count);
1904 req = kmalloc(req_len, GFP_KERNEL);
1905 if (!req) {
1906 r = -ENOMEM;
1907 goto error;
1908 }
1909
1910 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1911 for (i = 0; i < count; i++) {
1912 struct reg_data *rw = &req->reg_writes[i];
1913 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
1914 rw->value = cpu_to_le16(ioreqs[i].value);
1915 }
1916
1917 /* In USB 2.0 mode endpoint is interrupt type. However in USB 1.1 mode
1918 * endpoint is bulk. Select correct type URB by endpoint descriptor.
1919 */
1920 if (usb_endpoint_xfer_int(&ep->desc))
1921 usb_fill_int_urb(urb, udev, usb_sndintpipe(udev, EP_REGS_OUT),
1922 req, req_len, iowrite16v_urb_complete, usb,
1923 ep->desc.bInterval);
1924 else
1925 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1926 req, req_len, iowrite16v_urb_complete, usb);
1927
1928 urb->transfer_flags |= URB_FREE_BUFFER;
1929
1930 /* Submit previous URB */
1931 r = zd_submit_waiting_urb(usb, false);
1932 if (r) {
1933 dev_dbg_f(zd_usb_dev(usb),
1934 "error in zd_submit_waiting_usb(). "
1935 "Error number %d\n", r);
1936 goto error;
1937 }
1938
1939 /* Delay submit so that URB_NO_INTERRUPT flag can be set for all URBs
1940 * of currect batch except for very last.
1941 */
1942 usb->urb_async_waiting = urb;
1943 return 0;
1944 error:
1945 usb_free_urb(urb);
1946 return r;
1947 }
1948
zd_usb_iowrite16v(struct zd_usb * usb,const struct zd_ioreq16 * ioreqs,unsigned int count)1949 int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1950 unsigned int count)
1951 {
1952 int r;
1953
1954 zd_usb_iowrite16v_async_start(usb);
1955 r = zd_usb_iowrite16v_async(usb, ioreqs, count);
1956 if (r) {
1957 zd_usb_iowrite16v_async_end(usb, 0);
1958 return r;
1959 }
1960 return zd_usb_iowrite16v_async_end(usb, 50 /* ms */);
1961 }
1962
zd_usb_rfwrite(struct zd_usb * usb,u32 value,u8 bits)1963 int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1964 {
1965 int r;
1966 struct usb_device *udev;
1967 struct usb_req_rfwrite *req = NULL;
1968 int i, req_len, actual_req_len;
1969 u16 bit_value_template;
1970
1971 if (in_atomic()) {
1972 dev_dbg_f(zd_usb_dev(usb),
1973 "error: io in atomic context not supported\n");
1974 return -EWOULDBLOCK;
1975 }
1976 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1977 dev_dbg_f(zd_usb_dev(usb),
1978 "error: bits %d are smaller than"
1979 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1980 bits, USB_MIN_RFWRITE_BIT_COUNT);
1981 return -EINVAL;
1982 }
1983 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1984 dev_dbg_f(zd_usb_dev(usb),
1985 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1986 bits, USB_MAX_RFWRITE_BIT_COUNT);
1987 return -EINVAL;
1988 }
1989 #ifdef DEBUG
1990 if (value & (~0UL << bits)) {
1991 dev_dbg_f(zd_usb_dev(usb),
1992 "error: value %#09x has bits >= %d set\n",
1993 value, bits);
1994 return -EINVAL;
1995 }
1996 #endif /* DEBUG */
1997
1998 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1999
2000 r = zd_usb_ioread16(usb, &bit_value_template, ZD_CR203);
2001 if (r) {
2002 dev_dbg_f(zd_usb_dev(usb),
2003 "error %d: Couldn't read ZD_CR203\n", r);
2004 return r;
2005 }
2006 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
2007
2008 ZD_ASSERT(mutex_is_locked(&zd_usb_to_chip(usb)->mutex));
2009 BUILD_BUG_ON(sizeof(struct usb_req_rfwrite) +
2010 USB_MAX_RFWRITE_BIT_COUNT * sizeof(__le16) >
2011 sizeof(usb->req_buf));
2012 BUG_ON(sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16) >
2013 sizeof(usb->req_buf));
2014
2015 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
2016 req = (void *)usb->req_buf;
2017
2018 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
2019 /* 1: 3683a, but not used in ZYDAS driver */
2020 req->value = cpu_to_le16(2);
2021 req->bits = cpu_to_le16(bits);
2022
2023 for (i = 0; i < bits; i++) {
2024 u16 bv = bit_value_template;
2025 if (value & (1 << (bits-1-i)))
2026 bv |= RF_DATA;
2027 req->bit_values[i] = cpu_to_le16(bv);
2028 }
2029
2030 udev = zd_usb_to_usbdev(usb);
2031 r = zd_ep_regs_out_msg(udev, req, req_len, &actual_req_len, 50 /*ms*/);
2032 if (r) {
2033 dev_dbg_f(zd_usb_dev(usb),
2034 "error in zd_ep_regs_out_msg(). Error number %d\n", r);
2035 goto out;
2036 }
2037 if (req_len != actual_req_len) {
2038 dev_dbg_f(zd_usb_dev(usb), "error in zd_ep_regs_out_msg()"
2039 " req_len %d != actual_req_len %d\n",
2040 req_len, actual_req_len);
2041 r = -EIO;
2042 goto out;
2043 }
2044
2045 /* FALL-THROUGH with r == 0 */
2046 out:
2047 return r;
2048 }
2049
