summaryrefslogtreecommitdiff
path: root/package/rt2x00/src/rt2x00usb.c
blob: 6b193d023c8e26879e07211467faa21c831dee1f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
/*
	Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
	<http://rt2x00.serialmonkey.com>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the
	Free Software Foundation, Inc.,
	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*
	Module: rt2x00usb
	Abstract: rt2x00 generic usb device routines.
	Supported chipsets: rt2570, rt2571W & rt2671.
 */

/*
 * Set enviroment defines for rt2x00.h
 */
#define DRV_NAME "rt2x00usb"

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/version.h>
#include <linux/init.h>
#include <linux/usb.h>

#include "rt2x00.h"
#include "rt2x00usb.h"

/*
 * Interfacing with the HW.
 */
int rt2x00usb_vendor_request(const struct rt2x00_dev *rt2x00dev,
	const u8 request, const u8 type, const u16 offset,
	u32 value, void *buffer, const u16 buffer_length, const u16 timeout)
{
	struct usb_device *usb_dev = interface_to_usbdev(
		rt2x00dev_usb(rt2x00dev));
	int status;
	unsigned int i;

	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
		status = usb_control_msg(
			usb_dev,
			(type == USB_VENDOR_REQUEST_IN) ?
				usb_rcvctrlpipe(usb_dev, 0) :
				usb_sndctrlpipe(usb_dev, 0),
			request, type, value, offset, buffer, buffer_length,
			timeout);
		if (status >= 0)
			return 0;
	}

	ERROR(rt2x00dev, "vendor request error. Request 0x%02x failed "
		"for offset 0x%04x with error %d.\n", request, offset, status);

	return status;
}
EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);

/*
 * Radio handlers
 */
void rt2x00usb_enable_radio(struct rt2x00_dev *rt2x00dev)
{
	unsigned int i;

	/*
	 * Start the RX ring.
	 */
	for (i = 0; i < rt2x00dev->rx->stats.limit; i++) {
		__set_bit(ENTRY_OWNER_NIC, &rt2x00dev->rx->entry[i].flags);
		usb_submit_urb(rt2x00dev->rx->entry[i].priv, GFP_ATOMIC);
	}
}
EXPORT_SYMBOL_GPL(rt2x00usb_enable_radio);

void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
{
	struct data_ring *ring;
	unsigned int i;

	rt2x00usb_vendor_request(rt2x00dev, USB_RX_CONTROL,
		USB_VENDOR_REQUEST_OUT, 0x00, 0x00, NULL, 0, REGISTER_TIMEOUT);

	/*
	 * Cancel all rings.
	 */
	ring_for_each(rt2x00dev, ring) {
		for (i = 0; i < ring->stats.limit; i++)
			usb_kill_urb(ring->entry[i].priv);
	}
}
EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);

/*
 * Beacon handlers.
 */
int rt2x00usb_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb,
	struct ieee80211_tx_control *control)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct usb_device *usb_dev =
		interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
	struct data_ring *ring =
		rt2x00_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
	struct data_entry *beacon;
	struct data_entry *guardian;
	int length;

	/*
	 * Just in case the ieee80211 doesn't set this,
	 * but we need this queue set for the descriptor
	 * initialization.
	 */
	control->queue = IEEE80211_TX_QUEUE_BEACON;

	/*
	 * Obtain 2 entries, one for the guardian byte,
	 * the second for the actual beacon.
	 */
	guardian = rt2x00_get_data_entry(ring);
	rt2x00_ring_index_inc(ring);
	beacon = rt2x00_get_data_entry(ring);

	/*
	 * First we create the beacon.
	 */
	skb_push(skb, ring->desc_size);
	rt2x00lib_write_tx_desc(rt2x00dev, beacon,
		(struct data_desc*)skb->data,
		(struct ieee80211_hdr*)(skb->data + ring->desc_size),
		skb->len - ring->desc_size,
		control);

	/*
	 * Length passed to usb_fill_urb cannot be an odd number,
	 * so add 1 byte to make it even.
	 */
	length = skb->len;
	if (length % 2)
		length++;

	usb_fill_bulk_urb(
		beacon->priv,
		usb_dev,
		usb_sndbulkpipe(usb_dev, 1),
		skb->data,
		length,
		rt2x00usb_beacondone,
		beacon);

	beacon->skb = skb;

	/*
	 * Second we need to create the guardian byte.
	 * We only need a single byte, so lets recycle
	 * the 'flags' field we are not using for beacons.
	 */
	guardian->flags = 0;
	usb_fill_bulk_urb(
		guardian->priv,
		usb_dev,
		usb_sndbulkpipe(usb_dev, 1),
		&guardian->flags,
		1,
		rt2x00usb_beacondone,
		guardian);

	/*
	 * Send out the guardian byte.
	 */
	usb_submit_urb(guardian->priv, GFP_ATOMIC);

	/*
	 * Enable beacon generation.
	 */
	rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);

	return 0;
}
EXPORT_SYMBOL_GPL(rt2x00usb_beacon_update);

void rt2x00usb_beacondone(struct urb *urb)
{
	struct data_entry *entry = (struct data_entry*)urb->context;
	struct data_ring *ring = entry->ring;

	if (!test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags))
		return;

	/*
	 * Check if this was the guardian beacon,
	 * if that was the case we need to send the real beacon now.
	 * Otherwise we should free the sk_buffer, the device
	 * should be doing the rest of the work now.
	 */
	if (ring->index == 1) {
		rt2x00_ring_index_done_inc(ring);
		entry = rt2x00_get_data_entry(ring);
		usb_submit_urb(entry->priv, GFP_ATOMIC);
		rt2x00_ring_index_inc(ring);
	} else if (ring->index_done == 1) {
		entry = rt2x00_get_data_entry_done(ring);
		if (entry->skb) {
			dev_kfree_skb(entry->skb);
			entry->skb = NULL;
		}
		rt2x00_ring_index_done_inc(ring);
	}
}
EXPORT_SYMBOL_GPL(rt2x00usb_beacondone);

/*
 * TX data handlers.
 */
static void rt2x00usb_interrupt_txdone(struct urb *urb)
{
	struct data_entry *entry = (struct data_entry*)urb->context;
	struct data_ring *ring = entry->ring;
	struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
	struct data_desc *txd = (struct data_desc *)entry->skb->data;
	u32 word;
	int tx_status;

	if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
	    !__test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
		return;

	rt2x00_desc_read(txd, 0, &word);

	/*
	 * Remove the descriptor data from the buffer.
	 */
	skb_pull(entry->skb, ring->desc_size);

	/*
	 * Obtain the status about this packet.
	 */
	tx_status = !urb->status ? TX_SUCCESS : TX_FAIL_RETRY;

	rt2x00lib_txdone(entry, tx_status, 0);

	/*
	 * Make this entry available for reuse.
	 */
	entry->flags = 0;
	rt2x00_ring_index_done_inc(entry->ring);

	/*
	 * If the data ring was full before the txdone handler
	 * we must make sure the packet queue in the mac80211 stack
	 * is reenabled when the txdone handler has finished.
	 */
	if (!rt2x00_ring_full(ring))
		ieee80211_wake_queue(rt2x00dev->hw,
			entry->tx_status.control.queue);
}

int rt2x00usb_write_tx_data(struct rt2x00_dev *rt2x00dev,
	struct data_ring *ring, struct sk_buff *skb,
	struct ieee80211_tx_control *control)
{
	struct usb_device *usb_dev =
		interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
	struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr*)skb->data;
	struct data_entry *entry = rt2x00_get_data_entry(ring);
	struct data_desc *txd;
	u32 length = skb->len;

	if (rt2x00_ring_full(ring)) {
		ieee80211_stop_queue(rt2x00dev->hw, control->queue);
		return -EINVAL;
	}

	if (test_bit(ENTRY_OWNER_NIC, &entry->flags)) {
		ERROR(rt2x00dev,
			"Arrived at non-free entry in the non-full queue %d.\n"
			"Please file bug report to %s.\n",
			control->queue, DRV_PROJECT);
		ieee80211_stop_queue( rt2x00dev->hw, control->queue);
		return -EINVAL;
	}

	skb_push(skb, rt2x00dev->hw->extra_tx_headroom);
	txd = (struct data_desc*)skb->data;
	rt2x00lib_write_tx_desc(rt2x00dev, entry, txd, ieee80211hdr,
		length, control);
	memcpy(&entry->tx_status.control, control, sizeof(*control));
	entry->skb = skb;

	/*
	 * Length passed to usb_fill_urb cannot be an odd number,
	 * so add 1 byte to make it even.
	 */
	length += rt2x00dev->hw->extra_tx_headroom;
	if (length % 2)
		length++;

	__set_bit(ENTRY_OWNER_NIC, &entry->flags);
	usb_fill_bulk_urb(
		entry->priv,
		usb_dev,
		usb_sndbulkpipe(usb_dev, 1),
		skb->data,
		length,
		rt2x00usb_interrupt_txdone,
		entry);
	usb_submit_urb(entry->priv, GFP_ATOMIC);

	rt2x00_ring_index_inc(ring);

	if (rt2x00_ring_full(ring))
		ieee80211_stop_queue(rt2x00dev->hw, control->queue);

	return 0;
}
EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);

/*
 * Device initialization handlers.
 */
static int rt2x00usb_alloc_ring(struct rt2x00_dev *rt2x00dev,
	struct data_ring *ring)
{
	unsigned int i;

	/*
	 * Allocate the URB's
	 */
	for (i = 0; i < ring->stats.limit; i++) {
		ring->entry[i].priv = usb_alloc_urb(0, GFP_KERNEL);
		if (!ring->entry[i].priv)
			return -ENOMEM;
	}

	return 0;
}

int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
{
	struct data_ring *ring;
	struct sk_buff *skb;
	unsigned int entry_size;
	unsigned int i;
	int status;

	/*
	 * Allocate DMA
	 */
	ring_for_each(rt2x00dev, ring) {
		status = rt2x00usb_alloc_ring(rt2x00dev, ring);
		if (status)
			goto exit;
	}

	/*
	 * For the RX ring, skb's should be allocated.
	 */
	entry_size = ring->data_size + ring->desc_size;
	for (i = 0; i < rt2x00dev->rx->stats.limit; i++) {
		skb = dev_alloc_skb(NET_IP_ALIGN + entry_size);
		if (!skb)
			goto exit;

		skb_reserve(skb, NET_IP_ALIGN);
		skb_put(skb, entry_size);

		rt2x00dev->rx->entry[i].skb = skb;
	}

	return 0;

exit:
	rt2x00usb_uninitialize(rt2x00dev);

	return status;
}
EXPORT_SYMBOL_GPL(rt2x00usb_initialize);

void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
{
	struct data_ring *ring;
	unsigned int i;

	ring_for_each(rt2x00dev, ring) {
		if (!ring->entry)
			continue;

		for (i = 0; i < ring->stats.limit; i++) {
			usb_kill_urb(ring->entry[i].priv);
			usb_free_urb(ring->entry[i].priv);
			if (ring->entry[i].skb)
				kfree_skb(ring->entry[i].skb);
		}
	}
}
EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);

/*
 * USB driver handlers.
 */
int rt2x00usb_probe(struct usb_interface *usb_intf,
	const struct usb_device_id *id)
{
	struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
	struct rt2x00_ops *ops = (struct rt2x00_ops*)id->driver_info;
	struct ieee80211_hw *hw;
	struct rt2x00_dev *rt2x00dev;
	int retval;

	usb_dev = usb_get_dev(usb_dev);

	hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
	if (!hw) {
		ERROR_PROBE("Failed to allocate hardware.\n");
		retval = -ENOMEM;
		goto exit_put_device;
	}

	usb_set_intfdata(usb_intf, hw);

	rt2x00dev = hw->priv;
	rt2x00dev->dev = usb_intf;
	rt2x00dev->device = &usb_intf->dev;
	rt2x00dev->ops = ops;
	rt2x00dev->hw = hw;

	retval = rt2x00lib_probe_dev(rt2x00dev);
	if (retval)
		goto exit_free_device;

	return 0;

exit_free_device:
	ieee80211_free_hw(hw);

exit_put_device:
	usb_put_dev(usb_dev);

	usb_set_intfdata(usb_intf, NULL);

	return retval;
}
EXPORT_SYMBOL_GPL(rt2x00usb_probe);

void rt2x00usb_disconnect(struct usb_interface *usb_intf)
{
	struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
	struct rt2x00_dev *rt2x00dev = hw->priv;

	/*
	 * Free all allocated data.
	 */
	rt2x00lib_remove_dev(rt2x00dev);
	ieee80211_free_hw(hw);

	/*
	 * Free the USB device data.
	 */
	usb_set_intfdata(usb_intf, NULL);
	usb_put_dev(interface_to_usbdev(usb_intf));
}
EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);

#ifdef CONFIG_PM
int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
{
	struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
	struct rt2x00_dev *rt2x00dev = hw->priv;
	int retval;

	retval = rt2x00lib_suspend(rt2x00dev, state);
	if (retval)
		return retval;

	/*
	 * Decrease usbdev refcount.
	 */
	usb_put_dev(interface_to_usbdev(usb_intf));

	return 0;
}
EXPORT_SYMBOL_GPL(rt2x00usb_suspend);

int rt2x00usb_resume(struct usb_interface *usb_intf)
{
	struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
	struct rt2x00_dev *rt2x00dev = hw->priv;

	usb_get_dev(interface_to_usbdev(usb_intf));

	return rt2x00lib_resume(rt2x00dev);
}
EXPORT_SYMBOL_GPL(rt2x00usb_resume);
#endif /* CONFIG_PM */

/*
 * rt2x00pci module information.
 */
MODULE_AUTHOR(DRV_PROJECT);
MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION("rt2x00 library");
MODULE_LICENSE("GPL");