1 /*
2 Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
3 <http://rt2x00.serialmonkey.com>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the
17 Free Software Foundation, Inc.,
18 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20
21 /*
22 Module: rt2x00usb
23 Abstract: rt2x00 generic usb device routines.
24 */
25
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/usb.h>
29 #include <linux/bug.h>
30
31 #include "rt2x00.h"
32 #include "rt2x00usb.h"
33
34 /*
35 * Interfacing with the HW.
36 */
37 int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
38 const u8 request, const u8 requesttype,
39 const u16 offset, const u16 value,
40 void *buffer, const u16 buffer_length,
41 const int timeout)
42 {
43 struct usb_device *usb_dev =
44 interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
45 int status;
46 unsigned int i;
47 unsigned int pipe =
48 (requesttype == USB_VENDOR_REQUEST_IN) ?
49 usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
50
51
52 for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
53 status = usb_control_msg(usb_dev, pipe, request, requesttype,
54 value, offset, buffer, buffer_length,
55 timeout);
56 if (status >= 0)
57 return 0;
58
59 /*
60 * Check for errors
61 * -ENODEV: Device has disappeared, no point continuing.
62 * All other errors: Try again.
63 */
64 else if (status == -ENODEV)
65 break;
66 }
67
68 ERROR(rt2x00dev,
69 "Vendor Request 0x%02x failed for offset 0x%04x with error %d.\n",
70 request, offset, status);
71
72 return status;
73 }
74 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
75
76 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
77 const u8 request, const u8 requesttype,
78 const u16 offset, void *buffer,
79 const u16 buffer_length, const int timeout)
80 {
81 int status;
82
83 BUG_ON(!mutex_is_locked(&rt2x00dev->usb_cache_mutex));
84
85 /*
86 * Check for Cache availability.
87 */
88 if (unlikely(!rt2x00dev->csr_cache || buffer_length > CSR_CACHE_SIZE)) {
89 ERROR(rt2x00dev, "CSR cache not available.\n");
90 return -ENOMEM;
91 }
92
93 if (requesttype == USB_VENDOR_REQUEST_OUT)
94 memcpy(rt2x00dev->csr_cache, buffer, buffer_length);
95
96 status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
97 offset, 0, rt2x00dev->csr_cache,
98 buffer_length, timeout);
99
100 if (!status && requesttype == USB_VENDOR_REQUEST_IN)
101 memcpy(buffer, rt2x00dev->csr_cache, buffer_length);
102
103 return status;
104 }
105 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
106
107 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
108 const u8 request, const u8 requesttype,
109 const u16 offset, void *buffer,
110 const u16 buffer_length, const int timeout)
111 {
112 int status;
113
114 mutex_lock(&rt2x00dev->usb_cache_mutex);
115
116 status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
117 requesttype, offset, buffer,
118 buffer_length, timeout);
119
120 mutex_unlock(&rt2x00dev->usb_cache_mutex);
121
122 return status;
123 }
124 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
125
126 /*
127 * TX data handlers.
128 */
129 static void rt2x00usb_interrupt_txdone(struct urb *urb)
130 {
131 struct data_entry *entry = (struct data_entry *)urb->context;
132 struct data_ring *ring = entry->ring;
133 struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
134 __le32 *txd = (__le32 *)entry->skb->data;
135 u32 word;
136 int tx_status;
137
138 if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
139 !__test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
140 return;
141
142 rt2x00_desc_read(txd, 0, &word);
143
144 /*
145 * Remove the descriptor data from the buffer.
146 */
147 skb_pull(entry->skb, ring->desc_size);
148
149 /*
150 * Obtain the status about this packet.
151 */
152 tx_status = !urb->status ? TX_SUCCESS : TX_FAIL_RETRY;
153
154 rt2x00lib_txdone(entry, tx_status, 0);
155
156 /*
157 * Make this entry available for reuse.
158 */
159 entry->flags = 0;
160 rt2x00_ring_index_done_inc(entry->ring);
161
162 /*
163 * If the data ring was full before the txdone handler
164 * we must make sure the packet queue in the mac80211 stack
165 * is reenabled when the txdone handler has finished.
166 */
167 if (!rt2x00_ring_full(ring))
168 ieee80211_wake_queue(rt2x00dev->hw,
169 entry->tx_status.control.queue);
170 }
171
172 int rt2x00usb_write_tx_data(struct rt2x00_dev *rt2x00dev,
173 struct data_ring *ring, struct sk_buff *skb,
174 struct ieee80211_tx_control *control)
175 {
176 struct usb_device *usb_dev =
177 interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
178 struct data_entry *entry = rt2x00_get_data_entry(ring);
179 struct skb_desc *desc;
180 u32 length;
181
182 if (rt2x00_ring_full(ring))
183 return -EINVAL;
184
185 if (test_bit(ENTRY_OWNER_NIC, &entry->flags)) {
186 ERROR(rt2x00dev,
187 "Arrived at non-free entry in the non-full queue %d.\n"
188 "Please file bug report to %s.\n",
189 control->queue, DRV_PROJECT);
190 return -EINVAL;
191 }
192
193 /*
194 * Add the descriptor in front of the skb.
195 */
196 skb_push(skb, ring->desc_size);
197 memset(skb->data, 0, ring->desc_size);
198
199 /*
200 * Fill in skb descriptor
201 */
202 desc = get_skb_desc(skb);
203 desc->desc_len = ring->desc_size;
204 desc->data_len = skb->len - ring->desc_size;
205 desc->desc = skb->data;
206 desc->data = skb->data + ring->desc_size;
207 desc->ring = ring;
208 desc->entry = entry;
209
210 rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
211
212 /*
213 * USB devices cannot blindly pass the skb->len as the
214 * length of the data to usb_fill_bulk_urb. Pass the skb
215 * to the driver to determine what the length should be.
216 */
217 length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, skb);
218
219 /*
220 * Initialize URB and send the frame to the device.
221 */
222 __set_bit(ENTRY_OWNER_NIC, &entry->flags);
223 usb_fill_bulk_urb(entry->priv, usb_dev, usb_sndbulkpipe(usb_dev, 1),
224 skb->data, length, rt2x00usb_interrupt_txdone, entry);
225 usb_submit_urb(entry->priv, GFP_ATOMIC);
226
227 rt2x00_ring_index_inc(ring);
228
229 return 0;
230 }
231 EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
232
233 /*
234 * RX data handlers.
235 */
236 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
237 {
238 struct data_entry *entry = (struct data_entry *)urb->context;
239 struct data_ring *ring = entry->ring;
240 struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
241 struct sk_buff *skb;
242 struct ieee80211_hdr *hdr;
243 struct skb_desc *skbdesc;
244 struct rxdata_entry_desc desc;
245 int header_size;
246 int frame_size;
247
248 if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
249 !test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
250 return;
251
252 /*
253 * Check if the received data is simply too small
254 * to be actually valid, or if the urb is signaling
255 * a problem.
256 */
257 if (urb->actual_length < entry->ring->desc_size || urb->status)
258 goto skip_entry;
259
260 /*
261 * Fill in skb descriptor
262 */
263 skbdesc = get_skb_desc(entry->skb);
264 skbdesc->ring = ring;
265 skbdesc->entry = entry;
266
267 memset(&desc, 0, sizeof(desc));
268 rt2x00dev->ops->lib->fill_rxdone(entry, &desc);
269
270 /*
271 * Allocate a new sk buffer to replace the current one.
272 * If allocation fails, we should drop the current frame
273 * so we can recycle the existing sk buffer for the new frame.
274 * As alignment we use 2 and not NET_IP_ALIGN because we need
275 * to be sure we have 2 bytes room in the head. (NET_IP_ALIGN
276 * can be 0 on some hardware). We use these 2 bytes for frame
277 * alignment later, we assume that the chance that
278 * header_size % 4 == 2 is bigger then header_size % 2 == 0
279 * and thus optimize alignment by reserving the 2 bytes in
280 * advance.
281 */
282 frame_size = entry->ring->data_size + entry->ring->desc_size;
283 skb = dev_alloc_skb(frame_size + 2);
284 if (!skb)
285 goto skip_entry;
286
287 skb_reserve(skb, 2);
288 skb_put(skb, frame_size);
289
290 /*
291 * The data behind the ieee80211 header must be
292 * aligned on a 4 byte boundary.
293 */
294 hdr = (struct ieee80211_hdr *)entry->skb->data;
295 header_size =
296 ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
297
298 if (header_size % 4 == 0) {
299 skb_push(entry->skb, 2);
300 memmove(entry->skb->data, entry->skb->data + 2, skb->len - 2);
301 }
302
303 /*
304 * Trim the entire buffer down to only contain the valid frame data
305 * excluding the device descriptor. The position of the descriptor
306 * varies. This means that we should check where the descriptor is
307 * and decide if we need to pull the data pointer to exclude the
308 * device descriptor.
309 */
310 if (skbdesc->data > skbdesc->desc)
311 skb_pull(entry->skb, skbdesc->desc_len);
312 skb_trim(entry->skb, desc.size);
313
314 /*
315 * Send the frame to rt2x00lib for further processing.
316 */
317 rt2x00lib_rxdone(entry, entry->skb, &desc);
318
319 /*
320 * Replace current entry's skb with the newly allocated one,
321 * and reinitialize the urb.
322 */
323 entry->skb = skb;
324 urb->transfer_buffer = entry->skb->data;
325 urb->transfer_buffer_length = entry->skb->len;
326
327 skip_entry:
328 if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
329 __set_bit(ENTRY_OWNER_NIC, &entry->flags);
330 usb_submit_urb(urb, GFP_ATOMIC);
331 }
332
333 rt2x00_ring_index_inc(ring);
334 }
335
336 /*
337 * Radio handlers
338 */
339 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
340 {
341 struct data_ring *ring;
342 unsigned int i;
343
344 rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0x0000, 0x0000,
345 REGISTER_TIMEOUT);
346
347 /*
348 * Cancel all rings.
349 */
350 ring_for_each(rt2x00dev, ring) {
351 for (i = 0; i < ring->stats.limit; i++)
352 usb_kill_urb(ring->entry[i].priv);
353 }
354 }
355 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
356
357 /*
358 * Device initialization handlers.
359 */
360 void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
361 struct data_entry *entry)
362 {
363 struct usb_device *usb_dev =
364 interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
365
366 usb_fill_bulk_urb(entry->priv, usb_dev,
367 usb_rcvbulkpipe(usb_dev, 1),
368 entry->skb->data, entry->skb->len,
369 rt2x00usb_interrupt_rxdone, entry);
370
371 __set_bit(ENTRY_OWNER_NIC, &entry->flags);
372 usb_submit_urb(entry->priv, GFP_ATOMIC);
373 }
374 EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
375
376 void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
377 struct data_entry *entry)
378 {
379 entry->flags = 0;
380 }
381 EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
382
383 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
384 struct data_ring *ring)
385 {
386 unsigned int i;
387
388 /*
389 * Allocate the URB's
390 */
391 for (i = 0; i < ring->stats.limit; i++) {
392 ring->entry[i].priv = usb_alloc_urb(0, GFP_KERNEL);
393 if (!ring->entry[i].priv)
394 return -ENOMEM;
395 }
396
397 return 0;
398 }
399
400 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
401 struct data_ring *ring)
402 {
403 unsigned int i;
404
405 if (!ring->entry)
406 return;
407
408 for (i = 0; i < ring->stats.limit; i++) {
409 usb_kill_urb(ring->entry[i].priv);
410 usb_free_urb(ring->entry[i].priv);
411 if (ring->entry[i].skb)
412 kfree_skb(ring->entry[i].skb);
413 }
414 }
415
416 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
417 {
418 struct data_ring *ring;
419 struct sk_buff *skb;
420 unsigned int entry_size;
421 unsigned int i;
422 int uninitialized_var(status);
423
424 /*
425 * Allocate DMA
426 */
427 ring_for_each(rt2x00dev, ring) {
428 status = rt2x00usb_alloc_urb(rt2x00dev, ring);
429 if (status)
430 goto exit;
431 }
432
433 /*
434 * For the RX ring, skb's should be allocated.
435 */
436 entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
437 for (i = 0; i < rt2x00dev->rx->stats.limit; i++) {
438 skb = dev_alloc_skb(NET_IP_ALIGN + entry_size);
439 if (!skb)
440 goto exit;
441
442 skb_reserve(skb, NET_IP_ALIGN);
443 skb_put(skb, entry_size);
444
445 rt2x00dev->rx->entry[i].skb = skb;
446 }
447
448 return 0;
449
450 exit:
451 rt2x00usb_uninitialize(rt2x00dev);
452
453 return status;
454 }
455 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
456
457 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
458 {
459 struct data_ring *ring;
460
461 ring_for_each(rt2x00dev, ring)
462 rt2x00usb_free_urb(rt2x00dev, ring);
463 }
464 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
465
466 /*
467 * USB driver handlers.
468 */
469 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
470 {
471 kfree(rt2x00dev->rf);
472 rt2x00dev->rf = NULL;
473
474 kfree(rt2x00dev->eeprom);
475 rt2x00dev->eeprom = NULL;
476
477 kfree(rt2x00dev->csr_cache);
478 rt2x00dev->csr_cache = NULL;
479 }
480
481 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
482 {
483 rt2x00dev->csr_cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
484 if (!rt2x00dev->csr_cache)
485 goto exit;
486
487 rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
488 if (!rt2x00dev->eeprom)
489 goto exit;
490
491 rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
492 if (!rt2x00dev->rf)
493 goto exit;
494
495 return 0;
496
497 exit:
498 ERROR_PROBE("Failed to allocate registers.\n");
499
500 rt2x00usb_free_reg(rt2x00dev);
501
502 return -ENOMEM;
503 }
504
505 int rt2x00usb_probe(struct usb_interface *usb_intf,
506 const struct usb_device_id *id)
507 {
508 struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
509 struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
510 struct ieee80211_hw *hw;
511 struct rt2x00_dev *rt2x00dev;
512 int retval;
513
514 usb_dev = usb_get_dev(usb_dev);
515
516 hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
517 if (!hw) {
518 ERROR_PROBE("Failed to allocate hardware.\n");
519 retval = -ENOMEM;
520 goto exit_put_device;
521 }
522
523 usb_set_intfdata(usb_intf, hw);
524
525 rt2x00dev = hw->priv;
526 rt2x00dev->dev = usb_intf;
527 rt2x00dev->ops = ops;
528 rt2x00dev->hw = hw;
529 mutex_init(&rt2x00dev->usb_cache_mutex);
530
531 rt2x00dev->usb_maxpacket =
532 usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
533 if (!rt2x00dev->usb_maxpacket)
534 rt2x00dev->usb_maxpacket = 1;
535
536 retval = rt2x00usb_alloc_reg(rt2x00dev);
537 if (retval)
538 goto exit_free_device;
539
540 retval = rt2x00lib_probe_dev(rt2x00dev);
541 if (retval)
542 goto exit_free_reg;
543
544 return 0;
545
546 exit_free_reg:
547 rt2x00usb_free_reg(rt2x00dev);
548
549 exit_free_device:
550 ieee80211_free_hw(hw);
551
552 exit_put_device:
553 usb_put_dev(usb_dev);
554
555 usb_set_intfdata(usb_intf, NULL);
556
557 return retval;
558 }
559 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
560
561 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
562 {
563 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
564 struct rt2x00_dev *rt2x00dev = hw->priv;
565
566 /*
567 * Free all allocated data.
568 */
569 rt2x00lib_remove_dev(rt2x00dev);
570 rt2x00usb_free_reg(rt2x00dev);
571 ieee80211_free_hw(hw);
572
573 /*
574 * Free the USB device data.
575 */
576 usb_set_intfdata(usb_intf, NULL);
577 usb_put_dev(interface_to_usbdev(usb_intf));
578 }
579 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
580
581 #ifdef CONFIG_PM
582 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
583 {
584 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
585 struct rt2x00_dev *rt2x00dev = hw->priv;
586 int retval;
587
588 retval = rt2x00lib_suspend(rt2x00dev, state);
589 if (retval)
590 return retval;
591
592 rt2x00usb_free_reg(rt2x00dev);
593
594 /*
595 * Decrease usbdev refcount.
596 */
597 usb_put_dev(interface_to_usbdev(usb_intf));
598
599 return 0;
600 }
601 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
602
603 int rt2x00usb_resume(struct usb_interface *usb_intf)
604 {
605 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
606 struct rt2x00_dev *rt2x00dev = hw->priv;
607 int retval;
608
609 usb_get_dev(interface_to_usbdev(usb_intf));
610
611 retval = rt2x00usb_alloc_reg(rt2x00dev);
612 if (retval)
613 return retval;
614
615 retval = rt2x00lib_resume(rt2x00dev);
616 if (retval)
617 goto exit_free_reg;
618
619 return 0;
620
621 exit_free_reg:
622 rt2x00usb_free_reg(rt2x00dev);
623
624 return retval;
625 }
626 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
627 #endif /* CONFIG_PM */
628
629 /*
630 * rt2x00pci module information.
631 */
632 MODULE_AUTHOR(DRV_PROJECT);
633 MODULE_VERSION(DRV_VERSION);
634 MODULE_DESCRIPTION("rt2x00 library");
635 MODULE_LICENSE("GPL");
636
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