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zd1211rw: port to mac80211
[linux-2.6-block.git] / drivers / net / wireless / zd1211rw / zd_usb.c
CommitLineData
e85d0918
DD		 1/* zd_usb.c
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 */
17
d066c219 18#include <linux/kernel.h>
e85d0918 19#include <linux/init.h>
e85d0918
DD		 20#include <linux/firmware.h>
21#include <linux/device.h>
22#include <linux/errno.h>
23#include <linux/skbuff.h>
24#include <linux/usb.h>
bc5f06a8 25#include <linux/workqueue.h>
459c51ad 26#include <net/mac80211.h>
c248725b 27#include <asm/unaligned.h>
e85d0918
DD		 28
29#include "zd_def.h"
e85d0918
DD		 30#include "zd_mac.h"
31#include "zd_usb.h"
e85d0918
DD		 32
33static struct usb_device_id usb_ids[] = {
34 /* ZD1211 */
35 { USB_DEVICE(0x0ace, 0x1211), .driver_info = DEVICE_ZD1211 },
36 { USB_DEVICE(0x07b8, 0x6001), .driver_info = DEVICE_ZD1211 },
37 { USB_DEVICE(0x126f, 0xa006), .driver_info = DEVICE_ZD1211 },
38 { USB_DEVICE(0x6891, 0xa727), .driver_info = DEVICE_ZD1211 },
39 { USB_DEVICE(0x0df6, 0x9071), .driver_info = DEVICE_ZD1211 },
aa1d3a18 40 { USB_DEVICE(0x0df6, 0x9075), .driver_info = DEVICE_ZD1211 },
e85d0918 41 { USB_DEVICE(0x157e, 0x300b), .driver_info = DEVICE_ZD1211 },
dd2f5538 42 { USB_DEVICE(0x079b, 0x004a), .driver_info = DEVICE_ZD1211 },
1b865491 43 { USB_DEVICE(0x1740, 0x2000), .driver_info = DEVICE_ZD1211 },
12f39308 44 { USB_DEVICE(0x157e, 0x3204), .driver_info = DEVICE_ZD1211 },
4ceb7e99 45 { USB_DEVICE(0x0586, 0x3402), .driver_info = DEVICE_ZD1211 },
fca2714f 46 { USB_DEVICE(0x0b3b, 0x5630), .driver_info = DEVICE_ZD1211 },
fc3e39be 47 { USB_DEVICE(0x0b05, 0x170c), .driver_info = DEVICE_ZD1211 },
f2423723
DD		 48 { USB_DEVICE(0x1435, 0x0711), .driver_info = DEVICE_ZD1211 },
49 { USB_DEVICE(0x0586, 0x3409), .driver_info = DEVICE_ZD1211 },
50 { USB_DEVICE(0x0b3b, 0x1630), .driver_info = DEVICE_ZD1211 },
a362bf57 51 { USB_DEVICE(0x0586, 0x3401), .driver_info = DEVICE_ZD1211 },
229782a3 52 { USB_DEVICE(0x14ea, 0xab13), .driver_info = DEVICE_ZD1211 },
a3fa3aba 53 { USB_DEVICE(0x13b1, 0x001e), .driver_info = DEVICE_ZD1211 },
a9eea9ae 54 { USB_DEVICE(0x0586, 0x3407), .driver_info = DEVICE_ZD1211 },
ababda03 55 { USB_DEVICE(0x129b, 0x1666), .driver_info = DEVICE_ZD1211 },
e85d0918
DD		 56 /* ZD1211B */
57 { USB_DEVICE(0x0ace, 0x1215), .driver_info = DEVICE_ZD1211B },
58 { USB_DEVICE(0x157e, 0x300d), .driver_info = DEVICE_ZD1211B },
dd2f5538 59 { USB_DEVICE(0x079b, 0x0062), .driver_info = DEVICE_ZD1211B },
943599ee 60 { USB_DEVICE(0x1582, 0x6003), .driver_info = DEVICE_ZD1211B },
8e87295b 61 { USB_DEVICE(0x050d, 0x705c), .driver_info = DEVICE_ZD1211B },
a2bdcc67
DD		 62 { USB_DEVICE(0x083a, 0x4505), .driver_info = DEVICE_ZD1211B },
63 { USB_DEVICE(0x0471, 0x1236), .driver_info = DEVICE_ZD1211B },
33218ba1 64 { USB_DEVICE(0x13b1, 0x0024), .driver_info = DEVICE_ZD1211B },
2e9b2467 65 { USB_DEVICE(0x0586, 0x340f), .driver_info = DEVICE_ZD1211B },
aec91028
DD		 66 { USB_DEVICE(0x0b05, 0x171b), .driver_info = DEVICE_ZD1211B },
67 { USB_DEVICE(0x0586, 0x3410), .driver_info = DEVICE_ZD1211B },
c445a31c 68 { USB_DEVICE(0x0baf, 0x0121), .driver_info = DEVICE_ZD1211B },
5d082fe8 69 { USB_DEVICE(0x0586, 0x3412), .driver_info = DEVICE_ZD1211B },
187bb417 70 { USB_DEVICE(0x0586, 0x3413), .driver_info = DEVICE_ZD1211B },
019a6755 71 { USB_DEVICE(0x0053, 0x5301), .driver_info = DEVICE_ZD1211B },
93f510bb 72 { USB_DEVICE(0x0411, 0x00da), .driver_info = DEVICE_ZD1211B },
6eb07250 73 { USB_DEVICE(0x2019, 0x5303), .driver_info = DEVICE_ZD1211B },
25343469 74 { USB_DEVICE(0x129b, 0x1667), .driver_info = DEVICE_ZD1211B },
8e97afe5 75 { USB_DEVICE(0x0cde, 0x001a), .driver_info = DEVICE_ZD1211B },
475fed1e 76 { USB_DEVICE(0x0586, 0x340a), .driver_info = DEVICE_ZD1211B },
61ef6062 77 { USB_DEVICE(0x0471, 0x1237), .driver_info = DEVICE_ZD1211B },
a1030e92
DD		 78 /* "Driverless" devices that need ejecting */
79 { USB_DEVICE(0x0ace, 0x2011), .driver_info = DEVICE_INSTALLER },
aa1d3a18 80 { USB_DEVICE(0x0ace, 0x20ff), .driver_info = DEVICE_INSTALLER },
e85d0918
DD		 81 {}
82};
83
84MODULE_LICENSE("GPL");
85MODULE_DESCRIPTION("USB driver for devices with the ZD1211 chip.");
86MODULE_AUTHOR("Ulrich Kunitz");
87MODULE_AUTHOR("Daniel Drake");
88MODULE_VERSION("1.0");
89MODULE_DEVICE_TABLE(usb, usb_ids);
90
91#define FW_ZD1211_PREFIX "zd1211/zd1211_"
92#define FW_ZD1211B_PREFIX "zd1211/zd1211b_"
93
e85d0918
DD		 94/* USB device initialization */
95
96static int request_fw_file(
97 const struct firmware **fw, const char *name, struct device *device)
98{
99 int r;
100
101 dev_dbg_f(device, "fw name %s\n", name);
102
103 r = request_firmware(fw, name, device);
104 if (r)
105 dev_err(device,
106 "Could not load firmware file %s. Error number %d\n",
107 name, r);
108 return r;
109}
110
111static inline u16 get_bcdDevice(const struct usb_device *udev)
112{
113 return le16_to_cpu(udev->descriptor.bcdDevice);
114}
115
116enum upload_code_flags {
117 REBOOT = 1,
118};
119
120/* Ensures that MAX_TRANSFER_SIZE is even. */
121#define MAX_TRANSFER_SIZE (USB_MAX_TRANSFER_SIZE & ~1)
122
123static int upload_code(struct usb_device *udev,
124 const u8 *data, size_t size, u16 code_offset, int flags)
125{
126 u8 *p;
127 int r;
128
129 /* USB request blocks need "kmalloced" buffers.
130 */
131 p = kmalloc(MAX_TRANSFER_SIZE, GFP_KERNEL);
132 if (!p) {
133 dev_err(&udev->dev, "out of memory\n");
134 r = -ENOMEM;
135 goto error;
136 }
137
138 size &= ~1;
139 while (size > 0) {
140 size_t transfer_size = size <= MAX_TRANSFER_SIZE ?
141 size : MAX_TRANSFER_SIZE;
142
143 dev_dbg_f(&udev->dev, "transfer size %zu\n", transfer_size);
144
145 memcpy(p, data, transfer_size);
146 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
147 USB_REQ_FIRMWARE_DOWNLOAD,
148 USB_DIR_OUT | USB_TYPE_VENDOR,
149 code_offset, 0, p, transfer_size, 1000 /* ms */);
150 if (r < 0) {
151 dev_err(&udev->dev,
152 "USB control request for firmware upload"
153 " failed. Error number %d\n", r);
154 goto error;
155 }
156 transfer_size = r & ~1;
157
158 size -= transfer_size;
159 data += transfer_size;
160 code_offset += transfer_size/sizeof(u16);
161 }
162
163 if (flags & REBOOT) {
164 u8 ret;
165
166 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
167 USB_REQ_FIRMWARE_CONFIRM,
168 USB_DIR_IN | USB_TYPE_VENDOR,
169 0, 0, &ret, sizeof(ret), 5000 /* ms */);
170 if (r != sizeof(ret)) {
171 dev_err(&udev->dev,
172 "control request firmeware confirmation failed."
173 " Return value %d\n", r);
174 if (r >= 0)
175 r = -ENODEV;
176 goto error;
177 }
178 if (ret & 0x80) {
179 dev_err(&udev->dev,
180 "Internal error while downloading."
181 " Firmware confirm return value %#04x\n",
182 (unsigned int)ret);
183 r = -ENODEV;
184 goto error;
185 }
186 dev_dbg_f(&udev->dev, "firmware confirm return value %#04x\n",
187 (unsigned int)ret);
188 }
189
190 r = 0;
191error:
192 kfree(p);
193 return r;
194}
195
196static u16 get_word(const void *data, u16 offset)
197{
198 const __le16 *p = data;
199 return le16_to_cpu(p[offset]);
200}
201
74553aed 202static char *get_fw_name(struct zd_usb *usb, char *buffer, size_t size,
e85d0918
DD		 203 const char* postfix)
204{
205 scnprintf(buffer, size, "%s%s",
74553aed 206 usb->is_zd1211b ?
e85d0918
DD		 207 FW_ZD1211B_PREFIX : FW_ZD1211_PREFIX,
208 postfix);
209 return buffer;
210}
211
74553aed 212static int handle_version_mismatch(struct zd_usb *usb,
d066c219
DD		 213 const struct firmware *ub_fw)
214{
74553aed 215 struct usb_device *udev = zd_usb_to_usbdev(usb);
d066c219
DD		 216 const struct firmware *ur_fw = NULL;
217 int offset;
218 int r = 0;
219 char fw_name[128];
220
221 r = request_fw_file(&ur_fw,
74553aed 222 get_fw_name(usb, fw_name, sizeof(fw_name), "ur"),
d066c219
DD		 223 &udev->dev);
224 if (r)
225 goto error;
226
ee302767 227 r = upload_code(udev, ur_fw->data, ur_fw->size, FW_START, REBOOT);
d066c219
DD		 228 if (r)
229 goto error;
230
ee302767 231 offset = (E2P_BOOT_CODE_OFFSET * sizeof(u16));
d066c219 232 r = upload_code(udev, ub_fw->data + offset, ub_fw->size - offset,
ee302767 233 E2P_START + E2P_BOOT_CODE_OFFSET, REBOOT);
d066c219
DD		 234
235 /* At this point, the vendor driver downloads the whole firmware
236 * image, hacks around with version IDs, and uploads it again,
237 * completely overwriting the boot code. We do not do this here as
238 * it is not required on any tested devices, and it is suspected to
239 * cause problems. */
240error:
241 release_firmware(ur_fw);
242 return r;
243}
244
74553aed 245static int upload_firmware(struct zd_usb *usb)
e85d0918
DD		 246{
247 int r;
248 u16 fw_bcdDevice;
249 u16 bcdDevice;
74553aed 250 struct usb_device *udev = zd_usb_to_usbdev(usb);
e85d0918
DD		 251 const struct firmware *ub_fw = NULL;
252 const struct firmware *uph_fw = NULL;
253 char fw_name[128];
254
255 bcdDevice = get_bcdDevice(udev);
256
257 r = request_fw_file(&ub_fw,
74553aed 258 get_fw_name(usb, fw_name, sizeof(fw_name), "ub"),
e85d0918
DD		 259 &udev->dev);
260 if (r)
261 goto error;
262
ee302767 263 fw_bcdDevice = get_word(ub_fw->data, E2P_DATA_OFFSET);
e85d0918 264
e85d0918
DD		 265 if (fw_bcdDevice != bcdDevice) {
266 dev_info(&udev->dev,
d066c219
DD		 267 "firmware version %#06x and device bootcode version "
268 "%#06x differ\n", fw_bcdDevice, bcdDevice);
269 if (bcdDevice <= 0x4313)
270 dev_warn(&udev->dev, "device has old bootcode, please "
271 "report success or failure\n");
272
74553aed 273 r = handle_version_mismatch(usb, ub_fw);
d066c219
DD		 274 if (r)
275 goto error;
e85d0918
DD		 276 } else {
277 dev_dbg_f(&udev->dev,
278 "firmware device id %#06x is equal to the "
279 "actual device id\n", fw_bcdDevice);
280 }
281
282
283 r = request_fw_file(&uph_fw,
74553aed 284 get_fw_name(usb, fw_name, sizeof(fw_name), "uphr"),
e85d0918
DD		 285 &udev->dev);
286 if (r)
287 goto error;
288
ee302767 289 r = upload_code(udev, uph_fw->data, uph_fw->size, FW_START, REBOOT);
e85d0918
DD		 290 if (r) {
291 dev_err(&udev->dev,
292 "Could not upload firmware code uph. Error number %d\n",
293 r);
294 }
295
296 /* FALL-THROUGH */
297error:
298 release_firmware(ub_fw);
299 release_firmware(uph_fw);
300 return r;
301}
302
74553aed
DD		 303/* Read data from device address space using "firmware interface" which does
304 * not require firmware to be loaded. */
305int zd_usb_read_fw(struct zd_usb *usb, zd_addr_t addr, u8 *data, u16 len)
306{
307 int r;
308 struct usb_device *udev = zd_usb_to_usbdev(usb);
309
310 r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
311 USB_REQ_FIRMWARE_READ_DATA, USB_DIR_IN | 0x40, addr, 0,
312 data, len, 5000);
313 if (r < 0) {
314 dev_err(&udev->dev,
315 "read over firmware interface failed: %d\n", r);
316 return r;
317 } else if (r != len) {
318 dev_err(&udev->dev,
319 "incomplete read over firmware interface: %d/%d\n",
320 r, len);
321 return -EIO;
322 }
323
324 return 0;
325}
326
e85d0918
DD		 327#define urb_dev(urb) (&(urb)->dev->dev)
328
329static inline void handle_regs_int(struct urb *urb)
330{
331 struct zd_usb *usb = urb->context;
332 struct zd_usb_interrupt *intr = &usb->intr;
333 int len;
334
335 ZD_ASSERT(in_interrupt());
336 spin_lock(&intr->lock);
337
338 if (intr->read_regs_enabled) {
339 intr->read_regs.length = len = urb->actual_length;
340
341 if (len > sizeof(intr->read_regs.buffer))
342 len = sizeof(intr->read_regs.buffer);
343 memcpy(intr->read_regs.buffer, urb->transfer_buffer, len);
344 intr->read_regs_enabled = 0;
345 complete(&intr->read_regs.completion);
346 goto out;
347 }
348
349 dev_dbg_f(urb_dev(urb), "regs interrupt ignored\n");
350out:
351 spin_unlock(&intr->lock);
352}
353
7d12e780 354static void int_urb_complete(struct urb *urb)
e85d0918
DD		 355{
356 int r;
357 struct usb_int_header *hdr;
358
359 switch (urb->status) {
360 case 0:
361 break;
362 case -ESHUTDOWN:
363 case -EINVAL:
364 case -ENODEV:
365 case -ENOENT:
366 case -ECONNRESET:
e85d0918 367 case -EPIPE:
b312d799 368 goto kfree;
e85d0918
DD		 369 default:
370 goto resubmit;
371 }
372
373 if (urb->actual_length < sizeof(hdr)) {
374 dev_dbg_f(urb_dev(urb), "error: urb %p to small\n", urb);
375 goto resubmit;
376 }
377
378 hdr = urb->transfer_buffer;
379 if (hdr->type != USB_INT_TYPE) {
380 dev_dbg_f(urb_dev(urb), "error: urb %p wrong type\n", urb);
381 goto resubmit;
382 }
383
384 switch (hdr->id) {
385 case USB_INT_ID_REGS:
386 handle_regs_int(urb);
387 break;
388 case USB_INT_ID_RETRY_FAILED:
459c51ad 389 zd_mac_tx_failed(zd_usb_to_hw(urb->context));
e85d0918
DD		 390 break;
391 default:
392 dev_dbg_f(urb_dev(urb), "error: urb %p unknown id %x\n", urb,
393 (unsigned int)hdr->id);
394 goto resubmit;
395 }
396
397resubmit:
398 r = usb_submit_urb(urb, GFP_ATOMIC);
399 if (r) {
400 dev_dbg_f(urb_dev(urb), "resubmit urb %p\n", urb);
401 goto kfree;
402 }
403 return;
404kfree:
405 kfree(urb->transfer_buffer);
406}
407
408static inline int int_urb_interval(struct usb_device *udev)
409{
410 switch (udev->speed) {
411 case USB_SPEED_HIGH:
412 return 4;
413 case USB_SPEED_LOW:
414 return 10;
415 case USB_SPEED_FULL:
416 default:
417 return 1;
418 }
419}
420
421static inline int usb_int_enabled(struct zd_usb *usb)
422{
423 unsigned long flags;
424 struct zd_usb_interrupt *intr = &usb->intr;
425 struct urb *urb;
426
427 spin_lock_irqsave(&intr->lock, flags);
428 urb = intr->urb;
429 spin_unlock_irqrestore(&intr->lock, flags);
430 return urb != NULL;
431}
432
433int zd_usb_enable_int(struct zd_usb *usb)
434{
435 int r;
436 struct usb_device *udev;
437 struct zd_usb_interrupt *intr = &usb->intr;
438 void *transfer_buffer = NULL;
439 struct urb *urb;
440
441 dev_dbg_f(zd_usb_dev(usb), "\n");
442
35c3404e 443 urb = usb_alloc_urb(0, GFP_KERNEL);
e85d0918
DD		 444 if (!urb) {
445 r = -ENOMEM;
446 goto out;
447 }
448
449 ZD_ASSERT(!irqs_disabled());
450 spin_lock_irq(&intr->lock);
451 if (intr->urb) {
452 spin_unlock_irq(&intr->lock);
453 r = 0;
454 goto error_free_urb;
455 }
456 intr->urb = urb;
457 spin_unlock_irq(&intr->lock);
458
459 /* TODO: make it a DMA buffer */
460 r = -ENOMEM;
35c3404e 461 transfer_buffer = kmalloc(USB_MAX_EP_INT_BUFFER, GFP_KERNEL);
e85d0918
DD		 462 if (!transfer_buffer) {
463 dev_dbg_f(zd_usb_dev(usb),
464 "couldn't allocate transfer_buffer\n");
465 goto error_set_urb_null;
466 }
467
468 udev = zd_usb_to_usbdev(usb);
469 usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, EP_INT_IN),
470 transfer_buffer, USB_MAX_EP_INT_BUFFER,
471 int_urb_complete, usb,
472 intr->interval);
473
474 dev_dbg_f(zd_usb_dev(usb), "submit urb %p\n", intr->urb);
35c3404e 475 r = usb_submit_urb(urb, GFP_KERNEL);
e85d0918
DD		 476 if (r) {
477 dev_dbg_f(zd_usb_dev(usb),
478 "Couldn't submit urb. Error number %d\n", r);
479 goto error;
480 }
481
482 return 0;
483error:
484 kfree(transfer_buffer);
485error_set_urb_null:
486 spin_lock_irq(&intr->lock);
487 intr->urb = NULL;
488 spin_unlock_irq(&intr->lock);
489error_free_urb:
490 usb_free_urb(urb);
491out:
492 return r;
493}
494
495void zd_usb_disable_int(struct zd_usb *usb)
496{
497 unsigned long flags;
498 struct zd_usb_interrupt *intr = &usb->intr;
499 struct urb *urb;
500
501 spin_lock_irqsave(&intr->lock, flags);
502 urb = intr->urb;
503 if (!urb) {
504 spin_unlock_irqrestore(&intr->lock, flags);
505 return;
506 }
507 intr->urb = NULL;
508 spin_unlock_irqrestore(&intr->lock, flags);
509
510 usb_kill_urb(urb);
511 dev_dbg_f(zd_usb_dev(usb), "urb %p killed\n", urb);
512 usb_free_urb(urb);
513}
514
515static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
516 unsigned int length)
517{
518 int i;
e85d0918
DD		 519 const struct rx_length_info *length_info;
520
521 if (length < sizeof(struct rx_length_info)) {
522 /* It's not a complete packet anyhow. */
523 return;
524 }
525 length_info = (struct rx_length_info *)
526 (buffer + length - sizeof(struct rx_length_info));
527
528 /* It might be that three frames are merged into a single URB
529 * transaction. We have to check for the length info tag.
530 *
531 * While testing we discovered that length_info might be unaligned,
532 * because if USB transactions are merged, the last packet will not
533 * be padded. Unaligned access might also happen if the length_info
534 * structure is not present.
535 */
b269825b
UK		 536 if (get_unaligned(&length_info->tag) == cpu_to_le16(RX_LENGTH_INFO_TAG))
537 {
e85d0918
DD		 538 unsigned int l, k, n;
539 for (i = 0, l = 0;; i++) {
b269825b 540 k = le16_to_cpu(get_unaligned(&length_info->length[i]));
850c211c
UK		 541 if (k == 0)
542 return;
e85d0918
DD		 543 n = l+k;
544 if (n > length)
545 return;
459c51ad 546 zd_mac_rx(zd_usb_to_hw(usb), buffer+l, k);
e85d0918
DD		 547 if (i >= 2)
548 return;
549 l = (n+3) & ~3;
550 }
551 } else {
459c51ad 552 zd_mac_rx(zd_usb_to_hw(usb), buffer, length);
e85d0918
DD		 553 }
554}
555
7d12e780 556static void rx_urb_complete(struct urb *urb)
e85d0918
DD		 557{
558 struct zd_usb *usb;
559 struct zd_usb_rx *rx;
560 const u8 *buffer;
561 unsigned int length;
562
563 switch (urb->status) {
564 case 0:
565 break;
566 case -ESHUTDOWN:
567 case -EINVAL:
568 case -ENODEV:
569 case -ENOENT:
570 case -ECONNRESET:
e85d0918 571 case -EPIPE:
b312d799 572 return;
e85d0918
DD		 573 default:
574 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
575 goto resubmit;
576 }
577
578 buffer = urb->transfer_buffer;
579 length = urb->actual_length;
580 usb = urb->context;
581 rx = &usb->rx;
582
583 if (length%rx->usb_packet_size > rx->usb_packet_size-4) {
584 /* If there is an old first fragment, we don't care. */
585 dev_dbg_f(urb_dev(urb), "*** first fragment ***\n");
586 ZD_ASSERT(length <= ARRAY_SIZE(rx->fragment));
587 spin_lock(&rx->lock);
588 memcpy(rx->fragment, buffer, length);
589 rx->fragment_length = length;
590 spin_unlock(&rx->lock);
591 goto resubmit;
592 }
593
594 spin_lock(&rx->lock);
595 if (rx->fragment_length > 0) {
596 /* We are on a second fragment, we believe */
597 ZD_ASSERT(length + rx->fragment_length <=
598 ARRAY_SIZE(rx->fragment));
599 dev_dbg_f(urb_dev(urb), "*** second fragment ***\n");
600 memcpy(rx->fragment+rx->fragment_length, buffer, length);
601 handle_rx_packet(usb, rx->fragment,
602 rx->fragment_length + length);
603 rx->fragment_length = 0;
604 spin_unlock(&rx->lock);
605 } else {
606 spin_unlock(&rx->lock);
607 handle_rx_packet(usb, buffer, length);
608 }
609
610resubmit:
611 usb_submit_urb(urb, GFP_ATOMIC);
612}
613
459c51ad 614static struct urb *alloc_rx_urb(struct zd_usb *usb)
e85d0918
DD		 615{
616 struct usb_device *udev = zd_usb_to_usbdev(usb);
617 struct urb *urb;
618 void *buffer;
619
35c3404e 620 urb = usb_alloc_urb(0, GFP_KERNEL);
e85d0918
DD		 621 if (!urb)
622 return NULL;
35c3404e 623 buffer = usb_buffer_alloc(udev, USB_MAX_RX_SIZE, GFP_KERNEL,
e85d0918
DD		 624 &urb->transfer_dma);
625 if (!buffer) {
626 usb_free_urb(urb);
627 return NULL;
628 }
629
630 usb_fill_bulk_urb(urb, udev, usb_rcvbulkpipe(udev, EP_DATA_IN),
631 buffer, USB_MAX_RX_SIZE,
632 rx_urb_complete, usb);
633 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
634
635 return urb;
636}
637
459c51ad 638static void free_rx_urb(struct urb *urb)
e85d0918
DD		 639{
640 if (!urb)
641 return;
642 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
643 urb->transfer_buffer, urb->transfer_dma);
644 usb_free_urb(urb);
645}
646
647int zd_usb_enable_rx(struct zd_usb *usb)
648{
649 int i, r;
650 struct zd_usb_rx *rx = &usb->rx;
651 struct urb **urbs;
652
653 dev_dbg_f(zd_usb_dev(usb), "\n");
654
655 r = -ENOMEM;
459c51ad 656 urbs = kcalloc(RX_URBS_COUNT, sizeof(struct urb *), GFP_KERNEL);
e85d0918
DD		 657 if (!urbs)
658 goto error;
459c51ad
DD		 659 for (i = 0; i < RX_URBS_COUNT; i++) {
660 urbs[i] = alloc_rx_urb(usb);
e85d0918
DD		 661 if (!urbs[i])
662 goto error;
663 }
664
665 ZD_ASSERT(!irqs_disabled());
666 spin_lock_irq(&rx->lock);
667 if (rx->urbs) {
668 spin_unlock_irq(&rx->lock);
669 r = 0;
670 goto error;
671 }
672 rx->urbs = urbs;
459c51ad 673 rx->urbs_count = RX_URBS_COUNT;
e85d0918
DD		 674 spin_unlock_irq(&rx->lock);
675
459c51ad 676 for (i = 0; i < RX_URBS_COUNT; i++) {
35c3404e 677 r = usb_submit_urb(urbs[i], GFP_KERNEL);
e85d0918
DD		 678 if (r)
679 goto error_submit;
680 }
681
682 return 0;
683error_submit:
459c51ad 684 for (i = 0; i < RX_URBS_COUNT; i++) {
e85d0918
DD		 685 usb_kill_urb(urbs[i]);
686 }
687 spin_lock_irq(&rx->lock);
688 rx->urbs = NULL;
689 rx->urbs_count = 0;
690 spin_unlock_irq(&rx->lock);
691error:
692 if (urbs) {
459c51ad
DD		 693 for (i = 0; i < RX_URBS_COUNT; i++)
694 free_rx_urb(urbs[i]);
e85d0918
DD		 695 }
696 return r;
697}
698
699void zd_usb_disable_rx(struct zd_usb *usb)
700{
701 int i;
702 unsigned long flags;
703 struct urb **urbs;
704 unsigned int count;
705 struct zd_usb_rx *rx = &usb->rx;
706
707 spin_lock_irqsave(&rx->lock, flags);
708 urbs = rx->urbs;
709 count = rx->urbs_count;
710 spin_unlock_irqrestore(&rx->lock, flags);
711 if (!urbs)
712 return;
713
714 for (i = 0; i < count; i++) {
715 usb_kill_urb(urbs[i]);
459c51ad 716 free_rx_urb(urbs[i]);
e85d0918
DD		 717 }
718 kfree(urbs);
719
720 spin_lock_irqsave(&rx->lock, flags);
721 rx->urbs = NULL;
722 rx->urbs_count = 0;
723 spin_unlock_irqrestore(&rx->lock, flags);
724}
725
459c51ad
DD		 726/**
727 * zd_usb_disable_tx - disable transmission
728 * @usb: the zd1211rw-private USB structure
729 *
730 * Frees all URBs in the free list and marks the transmission as disabled.
731 */
732void zd_usb_disable_tx(struct zd_usb *usb)
733{
734 struct zd_usb_tx *tx = &usb->tx;
735 unsigned long flags;
736 struct list_head *pos, *n;
737
738 spin_lock_irqsave(&tx->lock, flags);
739 list_for_each_safe(pos, n, &tx->free_urb_list) {
740 list_del(pos);
741 usb_free_urb(list_entry(pos, struct urb, urb_list));
742 }
743 tx->enabled = 0;
744 tx->submitted_urbs = 0;
745 /* The stopped state is ignored, relying on ieee80211_wake_queues()
746 * in a potentionally following zd_usb_enable_tx().
747 */
748 spin_unlock_irqrestore(&tx->lock, flags);
749}
750
751/**
752 * zd_usb_enable_tx - enables transmission
753 * @usb: a &struct zd_usb pointer
754 *
755 * This function enables transmission and prepares the &zd_usb_tx data
756 * structure.
757 */
758void zd_usb_enable_tx(struct zd_usb *usb)
759{
760 unsigned long flags;
761 struct zd_usb_tx *tx = &usb->tx;
762
763 spin_lock_irqsave(&tx->lock, flags);
764 tx->enabled = 1;
765 tx->submitted_urbs = 0;
766 ieee80211_wake_queues(zd_usb_to_hw(usb));
767 tx->stopped = 0;
768 spin_unlock_irqrestore(&tx->lock, flags);
769}
770
771/**
772 * alloc_tx_urb - provides an tx URB
773 * @usb: a &struct zd_usb pointer
774 *
775 * Allocates a new URB. If possible takes the urb from the free list in
776 * usb->tx.
777 */
778static struct urb *alloc_tx_urb(struct zd_usb *usb)
779{
780 struct zd_usb_tx *tx = &usb->tx;
781 unsigned long flags;
782 struct list_head *entry;
783 struct urb *urb;
784
785 spin_lock_irqsave(&tx->lock, flags);
786 if (list_empty(&tx->free_urb_list)) {
787 urb = usb_alloc_urb(0, GFP_ATOMIC);
788 goto out;
789 }
790 entry = tx->free_urb_list.next;
791 list_del(entry);
792 urb = list_entry(entry, struct urb, urb_list);
793out:
794 spin_unlock_irqrestore(&tx->lock, flags);
795 return urb;
796}
797
798/**
799 * free_tx_urb - frees a used tx URB
800 * @usb: a &struct zd_usb pointer
801 * @urb: URB to be freed
802 *
803 * Frees the the transmission URB, which means to put it on the free URB
804 * list.
805 */
806static void free_tx_urb(struct zd_usb *usb, struct urb *urb)
807{
808 struct zd_usb_tx *tx = &usb->tx;
809 unsigned long flags;
810
811 spin_lock_irqsave(&tx->lock, flags);
812 if (!tx->enabled) {
813 usb_free_urb(urb);
814 goto out;
815 }
816 list_add(&urb->urb_list, &tx->free_urb_list);
817out:
818 spin_unlock_irqrestore(&tx->lock, flags);
819}
820
821static void tx_dec_submitted_urbs(struct zd_usb *usb)
822{
823 struct zd_usb_tx *tx = &usb->tx;
824 unsigned long flags;
825
826 spin_lock_irqsave(&tx->lock, flags);
827 --tx->submitted_urbs;
828 if (tx->stopped && tx->submitted_urbs <= ZD_USB_TX_LOW) {
829 ieee80211_wake_queues(zd_usb_to_hw(usb));
830 tx->stopped = 0;
831 }
832 spin_unlock_irqrestore(&tx->lock, flags);
833}
834
835static void tx_inc_submitted_urbs(struct zd_usb *usb)
836{
837 struct zd_usb_tx *tx = &usb->tx;
838 unsigned long flags;
839
840 spin_lock_irqsave(&tx->lock, flags);
841 ++tx->submitted_urbs;
842 if (!tx->stopped && tx->submitted_urbs > ZD_USB_TX_HIGH) {
843 ieee80211_stop_queues(zd_usb_to_hw(usb));
844 tx->stopped = 1;
845 }
846 spin_unlock_irqrestore(&tx->lock, flags);
847}
848
849/**
850 * tx_urb_complete - completes the execution of an URB
851 * @urb: a URB
852 *
853 * This function is called if the URB has been transferred to a device or an
854 * error has happened.
855 */
7d12e780 856static void tx_urb_complete(struct urb *urb)
e85d0918
DD		 857{
858 int r;
459c51ad
DD		 859 struct sk_buff *skb;
860 struct zd_tx_skb_control_block *cb;
861 struct zd_usb *usb;
e85d0918
DD		 862
863 switch (urb->status) {
864 case 0:
865 break;
866 case -ESHUTDOWN:
867 case -EINVAL:
868 case -ENODEV:
869 case -ENOENT:
870 case -ECONNRESET:
b312d799 871 case -EPIPE:
e85d0918
DD		 872 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
873 break;
e85d0918
DD		 874 default:
875 dev_dbg_f(urb_dev(urb), "urb %p error %d\n", urb, urb->status);
876 goto resubmit;
877 }
878free_urb:
459c51ad
DD		 879 skb = (struct sk_buff *)urb->context;
880 zd_mac_tx_to_dev(skb, urb->status);
881 cb = (struct zd_tx_skb_control_block *)skb->cb;
882 usb = &zd_hw_mac(cb->hw)->chip.usb;
883 free_tx_urb(usb, urb);
884 tx_dec_submitted_urbs(usb);
e85d0918
DD		 885 return;
886resubmit:
887 r = usb_submit_urb(urb, GFP_ATOMIC);
888 if (r) {
889 dev_dbg_f(urb_dev(urb), "error resubmit urb %p %d\n", urb, r);
890 goto free_urb;
891 }
892}
893
459c51ad
DD		 894/**
895 * zd_usb_tx: initiates transfer of a frame of the device
896 *
897 * @usb: the zd1211rw-private USB structure
898 * @skb: a &struct sk_buff pointer
899 *
900 * This function tranmits a frame to the device. It doesn't wait for
901 * completion. The frame must contain the control set and have all the
902 * control set information available.
903 *
904 * The function returns 0 if the transfer has been successfully initiated.
e85d0918 905 */
459c51ad 906int zd_usb_tx(struct zd_usb *usb, struct sk_buff *skb)
e85d0918
DD		 907{
908 int r;
909 struct usb_device *udev = zd_usb_to_usbdev(usb);
910 struct urb *urb;
e85d0918 911
459c51ad 912 urb = alloc_tx_urb(usb);
e85d0918
DD		 913 if (!urb) {
914 r = -ENOMEM;
915 goto out;
916 }
917
e85d0918 918 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, EP_DATA_OUT),
459c51ad 919 skb->data, skb->len, tx_urb_complete, skb);
e85d0918
DD		 920
921 r = usb_submit_urb(urb, GFP_ATOMIC);
922 if (r)
923 goto error;
459c51ad 924 tx_inc_submitted_urbs(usb);
e85d0918
DD		 925 return 0;
926error:
459c51ad 927 free_tx_urb(usb, urb);
e85d0918
DD		 928out:
929 return r;
930}
931
932static inline void init_usb_interrupt(struct zd_usb *usb)
933{
934 struct zd_usb_interrupt *intr = &usb->intr;
935
936 spin_lock_init(&intr->lock);
937 intr->interval = int_urb_interval(zd_usb_to_usbdev(usb));
938 init_completion(&intr->read_regs.completion);
0ce34bc8 939 intr->read_regs.cr_int_addr = cpu_to_le16((u16)CR_INTERRUPT);
e85d0918
DD		 940}
941
942static inline void init_usb_rx(struct zd_usb *usb)
943{
944 struct zd_usb_rx *rx = &usb->rx;
945 spin_lock_init(&rx->lock);
946 if (interface_to_usbdev(usb->intf)->speed == USB_SPEED_HIGH) {
947 rx->usb_packet_size = 512;
948 } else {
949 rx->usb_packet_size = 64;
950 }
951 ZD_ASSERT(rx->fragment_length == 0);
952}
953
954static inline void init_usb_tx(struct zd_usb *usb)
955{
459c51ad
DD		 956 struct zd_usb_tx *tx = &usb->tx;
957 spin_lock_init(&tx->lock);
958 tx->enabled = 0;
959 tx->stopped = 0;
960 INIT_LIST_HEAD(&tx->free_urb_list);
961 tx->submitted_urbs = 0;
e85d0918
DD		 962}
963
459c51ad 964void zd_usb_init(struct zd_usb *usb, struct ieee80211_hw *hw,
e85d0918
DD		 965 struct usb_interface *intf)
966{
967 memset(usb, 0, sizeof(*usb));
968 usb->intf = usb_get_intf(intf);
459c51ad 969 usb_set_intfdata(usb->intf, hw);
e85d0918
DD		 970 init_usb_interrupt(usb);
971 init_usb_tx(usb);
972 init_usb_rx(usb);
973}
974
e85d0918
DD		 975void zd_usb_clear(struct zd_usb *usb)
976{
977 usb_set_intfdata(usb->intf, NULL);
978 usb_put_intf(usb->intf);
c48cf125 979 ZD_MEMCLEAR(usb, sizeof(*usb));
e85d0918
DD		 980 /* FIXME: usb_interrupt, usb_tx, usb_rx? */
981}
982
983static const char *speed(enum usb_device_speed speed)
984{
985 switch (speed) {
986 case USB_SPEED_LOW:
987 return "low";
988 case USB_SPEED_FULL:
989 return "full";
990 case USB_SPEED_HIGH:
991 return "high";
992 default:
993 return "unknown speed";
994 }
995}
996
997static int scnprint_id(struct usb_device *udev, char *buffer, size_t size)
998{
999 return scnprintf(buffer, size, "%04hx:%04hx v%04hx %s",
1000 le16_to_cpu(udev->descriptor.idVendor),
1001 le16_to_cpu(udev->descriptor.idProduct),
1002 get_bcdDevice(udev),
1003 speed(udev->speed));
1004}
1005
1006int zd_usb_scnprint_id(struct zd_usb *usb, char *buffer, size_t size)
1007{
1008 struct usb_device *udev = interface_to_usbdev(usb->intf);
1009 return scnprint_id(udev, buffer, size);
1010}
1011
1012#ifdef DEBUG
1013static void print_id(struct usb_device *udev)
1014{
1015 char buffer[40];
1016
1017 scnprint_id(udev, buffer, sizeof(buffer));
1018 buffer[sizeof(buffer)-1] = 0;
1019 dev_dbg_f(&udev->dev, "%s\n", buffer);
1020}
1021#else
1022#define print_id(udev) do { } while (0)
1023#endif
1024
a1030e92
DD		 1025static int eject_installer(struct usb_interface *intf)
1026{
1027 struct usb_device *udev = interface_to_usbdev(intf);
1028 struct usb_host_interface *iface_desc = &intf->altsetting[0];
1029 struct usb_endpoint_descriptor *endpoint;
1030 unsigned char *cmd;
1031 u8 bulk_out_ep;
1032 int r;
1033
1034 /* Find bulk out endpoint */
1035 endpoint = &iface_desc->endpoint[1].desc;
1036 if ((endpoint->bEndpointAddress & USB_TYPE_MASK) == USB_DIR_OUT &&
1037 (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
1038 USB_ENDPOINT_XFER_BULK) {
1039 bulk_out_ep = endpoint->bEndpointAddress;
1040 } else {
1041 dev_err(&udev->dev,
1042 "zd1211rw: Could not find bulk out endpoint\n");
1043 return -ENODEV;
1044 }
1045
1046 cmd = kzalloc(31, GFP_KERNEL);
1047 if (cmd == NULL)
1048 return -ENODEV;
1049
1050 /* USB bulk command block */
1051 cmd[0] = 0x55; /* bulk command signature */
1052 cmd[1] = 0x53; /* bulk command signature */
1053 cmd[2] = 0x42; /* bulk command signature */
1054 cmd[3] = 0x43; /* bulk command signature */
1055 cmd[14] = 6; /* command length */
1056
1057 cmd[15] = 0x1b; /* SCSI command: START STOP UNIT */
1058 cmd[19] = 0x2; /* eject disc */
1059
1060 dev_info(&udev->dev, "Ejecting virtual installer media...\n");
1061 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, bulk_out_ep),
1062 cmd, 31, NULL, 2000);
1063 kfree(cmd);
1064 if (r)
1065 return r;
1066
1067 /* At this point, the device disconnects and reconnects with the real
1068 * ID numbers. */
1069
1070 usb_set_intfdata(intf, NULL);
1071 return 0;
1072}
1073
74553aed
DD		 1074int zd_usb_init_hw(struct zd_usb *usb)
1075{
1076 int r;
1077 struct zd_mac *mac = zd_usb_to_mac(usb);
1078
1079 dev_dbg_f(zd_usb_dev(usb), "\n");
1080
1081 r = upload_firmware(usb);
1082 if (r) {
1083 dev_err(zd_usb_dev(usb),
1084 "couldn't load firmware. Error number %d\n", r);
1085 return r;
1086 }
1087
1088 r = usb_reset_configuration(zd_usb_to_usbdev(usb));
1089 if (r) {
1090 dev_dbg_f(zd_usb_dev(usb),
1091 "couldn't reset configuration. Error number %d\n", r);
1092 return r;
1093 }
1094
459c51ad 1095 r = zd_mac_init_hw(mac->hw);
74553aed
DD		 1096 if (r) {
1097 dev_dbg_f(zd_usb_dev(usb),
1098 "couldn't initialize mac. Error number %d\n", r);
1099 return r;
1100 }
1101
1102 usb->initialized = 1;
1103 return 0;
1104}
1105
e85d0918
DD		 1106static int probe(struct usb_interface *intf, const struct usb_device_id *id)
1107{
1108 int r;
1109 struct usb_device *udev = interface_to_usbdev(intf);
459c51ad
DD		 1110 struct zd_usb *usb;
1111 struct ieee80211_hw *hw = NULL;
e85d0918
DD		 1112
1113 print_id(udev);
1114
a1030e92
DD		 1115 if (id->driver_info & DEVICE_INSTALLER)
1116 return eject_installer(intf);
1117
e85d0918
DD		 1118 switch (udev->speed) {
1119 case USB_SPEED_LOW:
1120 case USB_SPEED_FULL:
1121 case USB_SPEED_HIGH:
1122 break;
1123 default:
1124 dev_dbg_f(&intf->dev, "Unknown USB speed\n");
1125 r = -ENODEV;
1126 goto error;
1127 }
1128
459c51ad
DD		 1129 r = usb_reset_device(udev);
1130 if (r) {
1131 dev_err(&intf->dev,
1132 "couldn't reset usb device. Error number %d\n", r);
1133 goto error;
1134 }
6e3632f6 1135
459c51ad
DD		 1136 hw = zd_mac_alloc_hw(intf);
1137 if (hw == NULL) {
e85d0918
DD		 1138 r = -ENOMEM;
1139 goto error;
1140 }
1141
459c51ad 1142 usb = &zd_hw_mac(hw)->chip.usb;
74553aed 1143 usb->is_zd1211b = (id->driver_info == DEVICE_ZD1211B) != 0;
e85d0918 1144
459c51ad 1145 r = zd_mac_preinit_hw(hw);
e85d0918
DD		 1146 if (r) {
1147 dev_dbg_f(&intf->dev,
1148 "couldn't initialize mac. Error number %d\n", r);
1149 goto error;
1150 }
1151
459c51ad 1152 r = ieee80211_register_hw(hw);
e85d0918
DD		 1153 if (r) {
1154 dev_dbg_f(&intf->dev,
459c51ad 1155 "couldn't register device. Error number %d\n", r);
e85d0918
DD		 1156 goto error;
1157 }
1158
1159 dev_dbg_f(&intf->dev, "successful\n");
459c51ad 1160 dev_info(&intf->dev, "%s\n", wiphy_name(hw->wiphy));
e85d0918
DD		 1161 return 0;
1162error:
1163 usb_reset_device(interface_to_usbdev(intf));
459c51ad
DD		 1164 if (hw) {
1165 zd_mac_clear(zd_hw_mac(hw));
1166 ieee80211_free_hw(hw);
1167 }
e85d0918
DD		 1168 return r;
1169}
1170
1171static void disconnect(struct usb_interface *intf)
1172{
459c51ad 1173 struct ieee80211_hw *hw = zd_intf_to_hw(intf);
e0579d57
MP		 1174 struct zd_mac *mac;
1175 struct zd_usb *usb;
e85d0918 1176
a1030e92
DD		 1177 /* Either something really bad happened, or we're just dealing with
1178 * a DEVICE_INSTALLER. */
459c51ad 1179 if (hw == NULL)
a1030e92
DD		 1180 return;
1181
459c51ad 1182 mac = zd_hw_mac(hw);
e0579d57
MP		 1183 usb = &mac->chip.usb;
1184
e85d0918
DD		 1185 dev_dbg_f(zd_usb_dev(usb), "\n");
1186
459c51ad 1187 ieee80211_unregister_hw(hw);
e85d0918
DD		 1188
1189 /* Just in case something has gone wrong! */
1190 zd_usb_disable_rx(usb);
1191 zd_usb_disable_int(usb);
1192
1193 /* If the disconnect has been caused by a removal of the
1194 * driver module, the reset allows reloading of the driver. If the
1195 * reset will not be executed here, the upload of the firmware in the
1196 * probe function caused by the reloading of the driver will fail.
1197 */
1198 usb_reset_device(interface_to_usbdev(intf));
1199
459c51ad
DD		 1200 zd_mac_clear(mac);
1201 ieee80211_free_hw(hw);
e85d0918
DD		 1202 dev_dbg(&intf->dev, "disconnected\n");
1203}
1204
1205static struct usb_driver driver = {
459c51ad 1206 .name = KBUILD_MODNAME,
e85d0918
DD		 1207 .id_table = usb_ids,
1208 .probe = probe,
1209 .disconnect = disconnect,
1210};
1211
bc5f06a8
UK		 1212struct workqueue_struct *zd_workqueue;
1213
e85d0918
DD		 1214static int __init usb_init(void)
1215{
1216 int r;
1217
741fec53 1218 pr_debug("%s usb_init()\n", driver.name);
e85d0918 1219
bc5f06a8
UK		 1220 zd_workqueue = create_singlethread_workqueue(driver.name);
1221 if (zd_workqueue == NULL) {
741fec53 1222 printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
bc5f06a8
UK		 1223 return -ENOMEM;
1224 }
1225
e85d0918
DD		 1226 r = usb_register(&driver);
1227 if (r) {
192b775c 1228 destroy_workqueue(zd_workqueue);
741fec53
UK		 1229 printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
1230 driver.name, r);
e85d0918
DD		 1231 return r;
1232 }
1233
741fec53 1234 pr_debug("%s initialized\n", driver.name);
e85d0918
DD		 1235 return 0;
1236}
1237
1238static void __exit usb_exit(void)
1239{
741fec53 1240 pr_debug("%s usb_exit()\n", driver.name);
e85d0918 1241 usb_deregister(&driver);
bc5f06a8 1242 destroy_workqueue(zd_workqueue);
e85d0918
DD		 1243}
1244
1245module_init(usb_init);
1246module_exit(usb_exit);
1247
1248static int usb_int_regs_length(unsigned int count)
1249{
1250 return sizeof(struct usb_int_regs) + count * sizeof(struct reg_data);
1251}
1252
1253static void prepare_read_regs_int(struct zd_usb *usb)
1254{
1255 struct zd_usb_interrupt *intr = &usb->intr;
1256
a68077de 1257 spin_lock_irq(&intr->lock);
e85d0918
DD		 1258 intr->read_regs_enabled = 1;
1259 INIT_COMPLETION(intr->read_regs.completion);
a68077de
UK		 1260 spin_unlock_irq(&intr->lock);
1261}
1262
1263static void disable_read_regs_int(struct zd_usb *usb)
1264{
1265 struct zd_usb_interrupt *intr = &usb->intr;
1266
1267 spin_lock_irq(&intr->lock);
1268 intr->read_regs_enabled = 0;
1269 spin_unlock_irq(&intr->lock);
e85d0918
DD		 1270}
1271
1272static int get_results(struct zd_usb *usb, u16 *values,
1273 struct usb_req_read_regs *req, unsigned int count)
1274{
1275 int r;
1276 int i;
1277 struct zd_usb_interrupt *intr = &usb->intr;
1278 struct read_regs_int *rr = &intr->read_regs;
1279 struct usb_int_regs *regs = (struct usb_int_regs *)rr->buffer;
1280
a68077de 1281 spin_lock_irq(&intr->lock);
e85d0918
DD		 1282
1283 r = -EIO;
1284 /* The created block size seems to be larger than expected.
1285 * However results appear to be correct.
1286 */
1287 if (rr->length < usb_int_regs_length(count)) {
1288 dev_dbg_f(zd_usb_dev(usb),
1289 "error: actual length %d less than expected %d\n",
1290 rr->length, usb_int_regs_length(count));
1291 goto error_unlock;
1292 }
1293 if (rr->length > sizeof(rr->buffer)) {
1294 dev_dbg_f(zd_usb_dev(usb),
1295 "error: actual length %d exceeds buffer size %zu\n",
1296 rr->length, sizeof(rr->buffer));
1297 goto error_unlock;
1298 }
1299
1300 for (i = 0; i < count; i++) {
1301 struct reg_data *rd = &regs->regs[i];
1302 if (rd->addr != req->addr[i]) {
1303 dev_dbg_f(zd_usb_dev(usb),
1304 "rd[%d] addr %#06hx expected %#06hx\n", i,
1305 le16_to_cpu(rd->addr),
1306 le16_to_cpu(req->addr[i]));
1307 goto error_unlock;
1308 }
1309 values[i] = le16_to_cpu(rd->value);
1310 }
1311
1312 r = 0;
1313error_unlock:
a68077de 1314 spin_unlock_irq(&intr->lock);
e85d0918
DD		 1315 return r;
1316}
1317
1318int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
1319 const zd_addr_t *addresses, unsigned int count)
1320{
1321 int r;
1322 int i, req_len, actual_req_len;
1323 struct usb_device *udev;
1324 struct usb_req_read_regs *req = NULL;
1325 unsigned long timeout;
1326
1327 if (count < 1) {
1328 dev_dbg_f(zd_usb_dev(usb), "error: count is zero\n");
1329 return -EINVAL;
1330 }
1331 if (count > USB_MAX_IOREAD16_COUNT) {
1332 dev_dbg_f(zd_usb_dev(usb),
1333 "error: count %u exceeds possible max %u\n",
1334 count, USB_MAX_IOREAD16_COUNT);
1335 return -EINVAL;
1336 }
1337 if (in_atomic()) {
1338 dev_dbg_f(zd_usb_dev(usb),
1339 "error: io in atomic context not supported\n");
1340 return -EWOULDBLOCK;
1341 }
1342 if (!usb_int_enabled(usb)) {
1343 dev_dbg_f(zd_usb_dev(usb),
1344 "error: usb interrupt not enabled\n");
1345 return -EWOULDBLOCK;
1346 }
1347
1348 req_len = sizeof(struct usb_req_read_regs) + count * sizeof(__le16);
35c3404e 1349 req = kmalloc(req_len, GFP_KERNEL);
e85d0918
DD		 1350 if (!req)
1351 return -ENOMEM;
1352 req->id = cpu_to_le16(USB_REQ_READ_REGS);
1353 for (i = 0; i < count; i++)
0ce34bc8 1354 req->addr[i] = cpu_to_le16((u16)addresses[i]);
e85d0918
DD		 1355
1356 udev = zd_usb_to_usbdev(usb);
1357 prepare_read_regs_int(usb);
1358 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1359 req, req_len, &actual_req_len, 1000 /* ms */);
1360 if (r) {
1361 dev_dbg_f(zd_usb_dev(usb),
1362 "error in usb_bulk_msg(). Error number %d\n", r);
1363 goto error;
1364 }
1365 if (req_len != actual_req_len) {
1366 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()\n"
1367 " req_len %d != actual_req_len %d\n",
1368 req_len, actual_req_len);
1369 r = -EIO;
1370 goto error;
1371 }
1372
1373 timeout = wait_for_completion_timeout(&usb->intr.read_regs.completion,
1374 msecs_to_jiffies(1000));
1375 if (!timeout) {
1376 disable_read_regs_int(usb);
1377 dev_dbg_f(zd_usb_dev(usb), "read timed out\n");
1378 r = -ETIMEDOUT;
1379 goto error;
1380 }
1381
1382 r = get_results(usb, values, req, count);
1383error:
1384 kfree(req);
1385 return r;
1386}
1387
1388int zd_usb_iowrite16v(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
1389 unsigned int count)
1390{
1391 int r;
1392 struct usb_device *udev;
1393 struct usb_req_write_regs *req = NULL;
1394 int i, req_len, actual_req_len;
1395
1396 if (count == 0)
1397 return 0;
1398 if (count > USB_MAX_IOWRITE16_COUNT) {
1399 dev_dbg_f(zd_usb_dev(usb),
1400 "error: count %u exceeds possible max %u\n",
1401 count, USB_MAX_IOWRITE16_COUNT);
1402 return -EINVAL;
1403 }
1404 if (in_atomic()) {
1405 dev_dbg_f(zd_usb_dev(usb),
1406 "error: io in atomic context not supported\n");
1407 return -EWOULDBLOCK;
1408 }
1409
1410 req_len = sizeof(struct usb_req_write_regs) +
1411 count * sizeof(struct reg_data);
35c3404e 1412 req = kmalloc(req_len, GFP_KERNEL);
e85d0918
DD		 1413 if (!req)
1414 return -ENOMEM;
1415
1416 req->id = cpu_to_le16(USB_REQ_WRITE_REGS);
1417 for (i = 0; i < count; i++) {
1418 struct reg_data *rw = &req->reg_writes[i];
0ce34bc8 1419 rw->addr = cpu_to_le16((u16)ioreqs[i].addr);
e85d0918
DD		 1420 rw->value = cpu_to_le16(ioreqs[i].value);
1421 }
1422
1423 udev = zd_usb_to_usbdev(usb);
1424 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1425 req, req_len, &actual_req_len, 1000 /* ms */);
1426 if (r) {
1427 dev_dbg_f(zd_usb_dev(usb),
1428 "error in usb_bulk_msg(). Error number %d\n", r);
1429 goto error;
1430 }
1431 if (req_len != actual_req_len) {
1432 dev_dbg_f(zd_usb_dev(usb),
1433 "error in usb_bulk_msg()"
1434 " req_len %d != actual_req_len %d\n",
1435 req_len, actual_req_len);
1436 r = -EIO;
1437 goto error;
1438 }
1439
1440 /* FALL-THROUGH with r == 0 */
1441error:
1442 kfree(req);
1443 return r;
1444}
1445
1446int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
1447{
1448 int r;
1449 struct usb_device *udev;
1450 struct usb_req_rfwrite *req = NULL;
1451 int i, req_len, actual_req_len;
1452 u16 bit_value_template;
1453
1454 if (in_atomic()) {
1455 dev_dbg_f(zd_usb_dev(usb),
1456 "error: io in atomic context not supported\n");
1457 return -EWOULDBLOCK;
1458 }
1459 if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
1460 dev_dbg_f(zd_usb_dev(usb),
1461 "error: bits %d are smaller than"
1462 " USB_MIN_RFWRITE_BIT_COUNT %d\n",
1463 bits, USB_MIN_RFWRITE_BIT_COUNT);
1464 return -EINVAL;
1465 }
1466 if (bits > USB_MAX_RFWRITE_BIT_COUNT) {
1467 dev_dbg_f(zd_usb_dev(usb),
1468 "error: bits %d exceed USB_MAX_RFWRITE_BIT_COUNT %d\n",
1469 bits, USB_MAX_RFWRITE_BIT_COUNT);
1470 return -EINVAL;
1471 }
1472#ifdef DEBUG
1473 if (value & (~0UL << bits)) {
1474 dev_dbg_f(zd_usb_dev(usb),
1475 "error: value %#09x has bits >= %d set\n",
1476 value, bits);
1477 return -EINVAL;
1478 }
1479#endif /* DEBUG */
1480
1481 dev_dbg_f(zd_usb_dev(usb), "value %#09x bits %d\n", value, bits);
1482
1483 r = zd_usb_ioread16(usb, &bit_value_template, CR203);
1484 if (r) {
1485 dev_dbg_f(zd_usb_dev(usb),
1486 "error %d: Couldn't read CR203\n", r);
1487 goto out;
1488 }
1489 bit_value_template &= ~(RF_IF_LE|RF_CLK|RF_DATA);
1490
1491 req_len = sizeof(struct usb_req_rfwrite) + bits * sizeof(__le16);
35c3404e 1492 req = kmalloc(req_len, GFP_KERNEL);
e85d0918
DD		 1493 if (!req)
1494 return -ENOMEM;
1495
1496 req->id = cpu_to_le16(USB_REQ_WRITE_RF);
1497 /* 1: 3683a, but not used in ZYDAS driver */
1498 req->value = cpu_to_le16(2);
1499 req->bits = cpu_to_le16(bits);
1500
1501 for (i = 0; i < bits; i++) {
1502 u16 bv = bit_value_template;
1503 if (value & (1 << (bits-1-i)))
1504 bv |= RF_DATA;
1505 req->bit_values[i] = cpu_to_le16(bv);
1506 }
1507
1508 udev = zd_usb_to_usbdev(usb);
1509 r = usb_bulk_msg(udev, usb_sndbulkpipe(udev, EP_REGS_OUT),
1510 req, req_len, &actual_req_len, 1000 /* ms */);
1511 if (r) {
1512 dev_dbg_f(zd_usb_dev(usb),
1513 "error in usb_bulk_msg(). Error number %d\n", r);
1514 goto out;
1515 }
1516 if (req_len != actual_req_len) {
1517 dev_dbg_f(zd_usb_dev(usb), "error in usb_bulk_msg()"
1518 " req_len %d != actual_req_len %d\n",
1519 req_len, actual_req_len);
1520 r = -EIO;
1521 goto out;
1522 }
1523
1524 /* FALL-THROUGH with r == 0 */
1525out:
1526 kfree(req);
1527 return r;
1528}
Linux 6.x block layer and io_uring tree(s)