2 Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
3 <http://rt2x00.serialmonkey.com>
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.
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.
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.
23 Abstract: rt2x00 generic usb device routines.
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/usb.h>
29 #include <linux/bug.h>
32 #include "rt2x00usb.h"
35 * Interfacing with the HW.
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
,
43 struct usb_device
*usb_dev
= to_usb_device_intf(rt2x00dev
->dev
);
47 (requesttype
== USB_VENDOR_REQUEST_IN
) ?
48 usb_rcvctrlpipe(usb_dev
, 0) : usb_sndctrlpipe(usb_dev
, 0);
51 for (i
= 0; i
< REGISTER_BUSY_COUNT
; i
++) {
52 status
= usb_control_msg(usb_dev
, pipe
, request
, requesttype
,
53 value
, offset
, buffer
, buffer_length
,
60 * -ENODEV: Device has disappeared, no point continuing.
61 * All other errors: Try again.
63 else if (status
== -ENODEV
)
68 "Vendor Request 0x%02x failed for offset 0x%04x with error %d.\n",
69 request
, offset
, status
);
73 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request
);
75 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev
*rt2x00dev
,
76 const u8 request
, const u8 requesttype
,
77 const u16 offset
, void *buffer
,
78 const u16 buffer_length
, const int timeout
)
82 BUG_ON(!mutex_is_locked(&rt2x00dev
->csr_mutex
));
85 * Check for Cache availability.
87 if (unlikely(!rt2x00dev
->csr
.cache
|| buffer_length
> CSR_CACHE_SIZE
)) {
88 ERROR(rt2x00dev
, "CSR cache not available.\n");
92 if (requesttype
== USB_VENDOR_REQUEST_OUT
)
93 memcpy(rt2x00dev
->csr
.cache
, buffer
, buffer_length
);
95 status
= rt2x00usb_vendor_request(rt2x00dev
, request
, requesttype
,
96 offset
, 0, rt2x00dev
->csr
.cache
,
97 buffer_length
, timeout
);
99 if (!status
&& requesttype
== USB_VENDOR_REQUEST_IN
)
100 memcpy(buffer
, rt2x00dev
->csr
.cache
, buffer_length
);
104 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock
);
106 int rt2x00usb_vendor_request_buff(struct rt2x00_dev
*rt2x00dev
,
107 const u8 request
, const u8 requesttype
,
108 const u16 offset
, void *buffer
,
109 const u16 buffer_length
, const int timeout
)
113 mutex_lock(&rt2x00dev
->csr_mutex
);
115 status
= rt2x00usb_vendor_req_buff_lock(rt2x00dev
, request
,
116 requesttype
, offset
, buffer
,
117 buffer_length
, timeout
);
119 mutex_unlock(&rt2x00dev
->csr_mutex
);
123 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff
);
125 int rt2x00usb_vendor_request_large_buff(struct rt2x00_dev
*rt2x00dev
,
126 const u8 request
, const u8 requesttype
,
127 const u16 offset
, const void *buffer
,
128 const u16 buffer_length
,
135 mutex_lock(&rt2x00dev
->csr_mutex
);
140 while (len
&& !status
) {
141 bsize
= min_t(u16
, CSR_CACHE_SIZE
, len
);
142 status
= rt2x00usb_vendor_req_buff_lock(rt2x00dev
, request
,
143 requesttype
, off
, tb
,
151 mutex_unlock(&rt2x00dev
->csr_mutex
);
155 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_large_buff
);
160 static void rt2x00usb_interrupt_txdone(struct urb
*urb
)
162 struct queue_entry
*entry
= (struct queue_entry
*)urb
->context
;
163 struct rt2x00_dev
*rt2x00dev
= entry
->queue
->rt2x00dev
;
164 struct txdone_entry_desc txdesc
;
166 if (!test_bit(DEVICE_STATE_ENABLED_RADIO
, &rt2x00dev
->flags
) ||
167 !test_bit(ENTRY_OWNER_DEVICE_DATA
, &entry
->flags
))
171 * Obtain the status about this packet.
172 * Note that when the status is 0 it does not mean the
173 * frame was send out correctly. It only means the frame
174 * was succesfully pushed to the hardware, we have no
175 * way to determine the transmission status right now.
176 * (Only indirectly by looking at the failed TX counters
181 __set_bit(TXDONE_UNKNOWN
, &txdesc
.flags
);
183 __set_bit(TXDONE_FAILURE
, &txdesc
.flags
);
186 rt2x00lib_txdone(entry
, &txdesc
);
189 int rt2x00usb_write_tx_data(struct queue_entry
*entry
)
191 struct rt2x00_dev
*rt2x00dev
= entry
->queue
->rt2x00dev
;
192 struct usb_device
*usb_dev
= to_usb_device_intf(rt2x00dev
->dev
);
193 struct queue_entry_priv_usb
*entry_priv
= entry
->priv_data
;
194 struct skb_frame_desc
*skbdesc
;
198 * Add the descriptor in front of the skb.
200 skb_push(entry
->skb
, entry
->queue
->desc_size
);
201 memset(entry
->skb
->data
, 0, entry
->queue
->desc_size
);
204 * Fill in skb descriptor
206 skbdesc
= get_skb_frame_desc(entry
->skb
);
207 skbdesc
->desc
= entry
->skb
->data
;
208 skbdesc
->desc_len
= entry
->queue
->desc_size
;
211 * USB devices cannot blindly pass the skb->len as the
212 * length of the data to usb_fill_bulk_urb. Pass the skb
213 * to the driver to determine what the length should be.
215 length
= rt2x00dev
->ops
->lib
->get_tx_data_len(rt2x00dev
, entry
->skb
);
217 usb_fill_bulk_urb(entry_priv
->urb
, usb_dev
,
218 usb_sndbulkpipe(usb_dev
, 1),
219 entry
->skb
->data
, length
,
220 rt2x00usb_interrupt_txdone
, entry
);
223 * Make sure the skb->data pointer points to the frame, not the
226 skb_pull(entry
->skb
, entry
->queue
->desc_size
);
230 EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data
);
232 static inline void rt2x00usb_kick_tx_entry(struct queue_entry
*entry
)
234 struct queue_entry_priv_usb
*entry_priv
= entry
->priv_data
;
236 if (test_and_clear_bit(ENTRY_DATA_PENDING
, &entry
->flags
))
237 usb_submit_urb(entry_priv
->urb
, GFP_ATOMIC
);
240 void rt2x00usb_kick_tx_queue(struct rt2x00_dev
*rt2x00dev
,
241 const enum data_queue_qid qid
)
243 struct data_queue
*queue
= rt2x00queue_get_queue(rt2x00dev
, qid
);
244 unsigned long irqflags
;
246 unsigned int index_done
;
250 * Only protect the range we are going to loop over,
251 * if during our loop a extra entry is set to pending
252 * it should not be kicked during this run, since it
253 * is part of another TX operation.
255 spin_lock_irqsave(&queue
->lock
, irqflags
);
256 index
= queue
->index
[Q_INDEX
];
257 index_done
= queue
->index
[Q_INDEX_DONE
];
258 spin_unlock_irqrestore(&queue
->lock
, irqflags
);
261 * Start from the TX done pointer, this guarentees that we will
262 * send out all frames in the correct order.
264 if (index_done
< index
) {
265 for (i
= index_done
; i
< index
; i
++)
266 rt2x00usb_kick_tx_entry(&queue
->entries
[i
]);
268 for (i
= index_done
; i
< queue
->limit
; i
++)
269 rt2x00usb_kick_tx_entry(&queue
->entries
[i
]);
271 for (i
= 0; i
< index
; i
++)
272 rt2x00usb_kick_tx_entry(&queue
->entries
[i
]);
275 EXPORT_SYMBOL_GPL(rt2x00usb_kick_tx_queue
);
280 static void rt2x00usb_interrupt_rxdone(struct urb
*urb
)
282 struct queue_entry
*entry
= (struct queue_entry
*)urb
->context
;
283 struct rt2x00_dev
*rt2x00dev
= entry
->queue
->rt2x00dev
;
284 struct skb_frame_desc
*skbdesc
= get_skb_frame_desc(entry
->skb
);
287 if (!test_bit(DEVICE_STATE_ENABLED_RADIO
, &rt2x00dev
->flags
) ||
288 !test_bit(ENTRY_OWNER_DEVICE_DATA
, &entry
->flags
))
292 * Check if the received data is simply too small
293 * to be actually valid, or if the urb is signaling
296 if (urb
->actual_length
< entry
->queue
->desc_size
|| urb
->status
) {
297 set_bit(ENTRY_OWNER_DEVICE_DATA
, &entry
->flags
);
298 usb_submit_urb(urb
, GFP_ATOMIC
);
303 * Fill in desc fields of the skb descriptor
306 skbdesc
->desc_len
= entry
->queue
->desc_size
;
309 * Send the frame to rt2x00lib for further processing.
311 rt2x00lib_rxdone(rt2x00dev
, entry
);
317 void rt2x00usb_disable_radio(struct rt2x00_dev
*rt2x00dev
)
319 struct queue_entry_priv_usb
*entry_priv
;
320 struct queue_entry_priv_usb_bcn
*bcn_priv
;
321 struct data_queue
*queue
;
324 rt2x00usb_vendor_request_sw(rt2x00dev
, USB_RX_CONTROL
, 0, 0,
330 queue_for_each(rt2x00dev
, queue
) {
331 for (i
= 0; i
< queue
->limit
; i
++) {
332 entry_priv
= queue
->entries
[i
].priv_data
;
333 usb_kill_urb(entry_priv
->urb
);
338 * Kill guardian urb (if required by driver).
340 if (!test_bit(DRIVER_REQUIRE_BEACON_GUARD
, &rt2x00dev
->flags
))
343 for (i
= 0; i
< rt2x00dev
->bcn
->limit
; i
++) {
344 bcn_priv
= rt2x00dev
->bcn
->entries
[i
].priv_data
;
345 if (bcn_priv
->guardian_urb
)
346 usb_kill_urb(bcn_priv
->guardian_urb
);
349 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio
);
352 * Device initialization handlers.
354 void rt2x00usb_clear_entry(struct queue_entry
*entry
)
356 struct usb_device
*usb_dev
=
357 to_usb_device_intf(entry
->queue
->rt2x00dev
->dev
);
358 struct queue_entry_priv_usb
*entry_priv
= entry
->priv_data
;
360 if (entry
->queue
->qid
== QID_RX
) {
361 usb_fill_bulk_urb(entry_priv
->urb
, usb_dev
,
362 usb_rcvbulkpipe(usb_dev
, 1),
363 entry
->skb
->data
, entry
->skb
->len
,
364 rt2x00usb_interrupt_rxdone
, entry
);
366 set_bit(ENTRY_OWNER_DEVICE_DATA
, &entry
->flags
);
367 usb_submit_urb(entry_priv
->urb
, GFP_ATOMIC
);
372 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry
);
374 static int rt2x00usb_alloc_urb(struct rt2x00_dev
*rt2x00dev
,
375 struct data_queue
*queue
)
377 struct queue_entry_priv_usb
*entry_priv
;
378 struct queue_entry_priv_usb_bcn
*bcn_priv
;
381 for (i
= 0; i
< queue
->limit
; i
++) {
382 entry_priv
= queue
->entries
[i
].priv_data
;
383 entry_priv
->urb
= usb_alloc_urb(0, GFP_KERNEL
);
384 if (!entry_priv
->urb
)
389 * If this is not the beacon queue or
390 * no guardian byte was required for the beacon,
393 if (rt2x00dev
->bcn
!= queue
||
394 !test_bit(DRIVER_REQUIRE_BEACON_GUARD
, &rt2x00dev
->flags
))
397 for (i
= 0; i
< queue
->limit
; i
++) {
398 bcn_priv
= queue
->entries
[i
].priv_data
;
399 bcn_priv
->guardian_urb
= usb_alloc_urb(0, GFP_KERNEL
);
400 if (!bcn_priv
->guardian_urb
)
407 static void rt2x00usb_free_urb(struct rt2x00_dev
*rt2x00dev
,
408 struct data_queue
*queue
)
410 struct queue_entry_priv_usb
*entry_priv
;
411 struct queue_entry_priv_usb_bcn
*bcn_priv
;
417 for (i
= 0; i
< queue
->limit
; i
++) {
418 entry_priv
= queue
->entries
[i
].priv_data
;
419 usb_kill_urb(entry_priv
->urb
);
420 usb_free_urb(entry_priv
->urb
);
424 * If this is not the beacon queue or
425 * no guardian byte was required for the beacon,
428 if (rt2x00dev
->bcn
!= queue
||
429 !test_bit(DRIVER_REQUIRE_BEACON_GUARD
, &rt2x00dev
->flags
))
432 for (i
= 0; i
< queue
->limit
; i
++) {
433 bcn_priv
= queue
->entries
[i
].priv_data
;
434 usb_kill_urb(bcn_priv
->guardian_urb
);
435 usb_free_urb(bcn_priv
->guardian_urb
);
439 int rt2x00usb_initialize(struct rt2x00_dev
*rt2x00dev
)
441 struct data_queue
*queue
;
447 queue_for_each(rt2x00dev
, queue
) {
448 status
= rt2x00usb_alloc_urb(rt2x00dev
, queue
);
456 rt2x00usb_uninitialize(rt2x00dev
);
460 EXPORT_SYMBOL_GPL(rt2x00usb_initialize
);
462 void rt2x00usb_uninitialize(struct rt2x00_dev
*rt2x00dev
)
464 struct data_queue
*queue
;
466 queue_for_each(rt2x00dev
, queue
)
467 rt2x00usb_free_urb(rt2x00dev
, queue
);
469 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize
);
472 * USB driver handlers.
474 static void rt2x00usb_free_reg(struct rt2x00_dev
*rt2x00dev
)
476 kfree(rt2x00dev
->rf
);
477 rt2x00dev
->rf
= NULL
;
479 kfree(rt2x00dev
->eeprom
);
480 rt2x00dev
->eeprom
= NULL
;
482 kfree(rt2x00dev
->csr
.cache
);
483 rt2x00dev
->csr
.cache
= NULL
;
486 static int rt2x00usb_alloc_reg(struct rt2x00_dev
*rt2x00dev
)
488 rt2x00dev
->csr
.cache
= kzalloc(CSR_CACHE_SIZE
, GFP_KERNEL
);
489 if (!rt2x00dev
->csr
.cache
)
492 rt2x00dev
->eeprom
= kzalloc(rt2x00dev
->ops
->eeprom_size
, GFP_KERNEL
);
493 if (!rt2x00dev
->eeprom
)
496 rt2x00dev
->rf
= kzalloc(rt2x00dev
->ops
->rf_size
, GFP_KERNEL
);
503 ERROR_PROBE("Failed to allocate registers.\n");
505 rt2x00usb_free_reg(rt2x00dev
);
510 int rt2x00usb_probe(struct usb_interface
*usb_intf
,
511 const struct usb_device_id
*id
)
513 struct usb_device
*usb_dev
= interface_to_usbdev(usb_intf
);
514 struct rt2x00_ops
*ops
= (struct rt2x00_ops
*)id
->driver_info
;
515 struct ieee80211_hw
*hw
;
516 struct rt2x00_dev
*rt2x00dev
;
519 usb_dev
= usb_get_dev(usb_dev
);
521 hw
= ieee80211_alloc_hw(sizeof(struct rt2x00_dev
), ops
->hw
);
523 ERROR_PROBE("Failed to allocate hardware.\n");
525 goto exit_put_device
;
528 usb_set_intfdata(usb_intf
, hw
);
530 rt2x00dev
= hw
->priv
;
531 rt2x00dev
->dev
= &usb_intf
->dev
;
532 rt2x00dev
->ops
= ops
;
535 rt2x00dev
->usb_maxpacket
=
536 usb_maxpacket(usb_dev
, usb_sndbulkpipe(usb_dev
, 1), 1);
537 if (!rt2x00dev
->usb_maxpacket
)
538 rt2x00dev
->usb_maxpacket
= 1;
540 retval
= rt2x00usb_alloc_reg(rt2x00dev
);
542 goto exit_free_device
;
544 retval
= rt2x00lib_probe_dev(rt2x00dev
);
551 rt2x00usb_free_reg(rt2x00dev
);
554 ieee80211_free_hw(hw
);
557 usb_put_dev(usb_dev
);
559 usb_set_intfdata(usb_intf
, NULL
);
563 EXPORT_SYMBOL_GPL(rt2x00usb_probe
);
565 void rt2x00usb_disconnect(struct usb_interface
*usb_intf
)
567 struct ieee80211_hw
*hw
= usb_get_intfdata(usb_intf
);
568 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
571 * Free all allocated data.
573 rt2x00lib_remove_dev(rt2x00dev
);
574 rt2x00usb_free_reg(rt2x00dev
);
575 ieee80211_free_hw(hw
);
578 * Free the USB device data.
580 usb_set_intfdata(usb_intf
, NULL
);
581 usb_put_dev(interface_to_usbdev(usb_intf
));
583 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect
);
586 int rt2x00usb_suspend(struct usb_interface
*usb_intf
, pm_message_t state
)
588 struct ieee80211_hw
*hw
= usb_get_intfdata(usb_intf
);
589 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
592 retval
= rt2x00lib_suspend(rt2x00dev
, state
);
596 rt2x00usb_free_reg(rt2x00dev
);
599 * Decrease usbdev refcount.
601 usb_put_dev(interface_to_usbdev(usb_intf
));
605 EXPORT_SYMBOL_GPL(rt2x00usb_suspend
);
607 int rt2x00usb_resume(struct usb_interface
*usb_intf
)
609 struct ieee80211_hw
*hw
= usb_get_intfdata(usb_intf
);
610 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
613 usb_get_dev(interface_to_usbdev(usb_intf
));
615 retval
= rt2x00usb_alloc_reg(rt2x00dev
);
619 retval
= rt2x00lib_resume(rt2x00dev
);
626 rt2x00usb_free_reg(rt2x00dev
);
630 EXPORT_SYMBOL_GPL(rt2x00usb_resume
);
631 #endif /* CONFIG_PM */
634 * rt2x00usb module information.
636 MODULE_AUTHOR(DRV_PROJECT
);
637 MODULE_VERSION(DRV_VERSION
);
638 MODULE_DESCRIPTION("rt2x00 usb library");
639 MODULE_LICENSE("GPL");