2 Copyright (C) 2004 - 2007 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.
24 Supported chipsets: rt2570, rt2571W & rt2671.
28 * Set enviroment defines for rt2x00.h
30 #define DRV_NAME "rt2x00usb"
32 #include <linux/kernel.h>
33 #include <linux/module.h>
34 #include <linux/version.h>
35 #include <linux/init.h>
36 #include <linux/usb.h>
39 #include "rt2x00lib.h"
40 #include "rt2x00usb.h"
43 * Interfacing with the HW.
45 int rt2x00usb_vendor_request(const struct rt2x00_dev *rt2x00dev,
46 const u8 request, const u8 type, const u16 offset,
47 u32 value, void *buffer, const u16 buffer_length, const u16 timeout)
49 struct usb_device *usb_dev = interface_to_usbdev(
50 rt2x00dev_usb(rt2x00dev));
54 for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
55 status = usb_control_msg(
57 (type == USB_VENDOR_REQUEST_IN) ?
58 usb_rcvctrlpipe(usb_dev, 0) :
59 usb_sndctrlpipe(usb_dev, 0),
60 request, type, value, offset, buffer, buffer_length,
66 ERROR(rt2x00dev, "Vendor Request 0x%02x failed for offset 0x%04x"
67 " with error %d.\n", request, offset, status);
71 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
76 int rt2x00usb_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb,
77 struct ieee80211_tx_control *control)
79 struct rt2x00_dev *rt2x00dev = hw->priv;
80 struct usb_device *usb_dev =
81 interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
82 struct data_ring *ring =
83 rt2x00_get_ring(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
84 struct data_entry *beacon;
85 struct data_entry *guardian;
89 * Just in case the ieee80211 doesn't set this,
90 * but we need this queue set for the descriptor
93 control->queue = IEEE80211_TX_QUEUE_BEACON;
96 * Obtain 2 entries, one for the guardian byte,
97 * the second for the actual beacon.
99 guardian = rt2x00_get_data_entry(ring);
100 rt2x00_ring_index_inc(ring);
101 beacon = rt2x00_get_data_entry(ring);
104 * First we create the beacon.
106 skb_push(skb, ring->desc_size);
107 rt2x00lib_write_tx_desc(rt2x00dev, beacon,
108 (struct data_desc*)skb->data,
109 (struct ieee80211_hdr*)(skb->data + ring->desc_size),
110 skb->len - ring->desc_size,
114 * Length passed to usb_fill_urb cannot be an odd number,
115 * so add 1 byte to make it even.
124 usb_sndbulkpipe(usb_dev, 1),
127 rt2x00usb_beacondone,
133 * Second we need to create the guardian byte.
134 * We only need a single byte, so lets recycle
135 * the 'flags' field we are not using for beacons.
141 usb_sndbulkpipe(usb_dev, 1),
144 rt2x00usb_beacondone,
148 * Send out the guardian byte.
150 usb_submit_urb(guardian->priv, GFP_ATOMIC);
153 * Enable beacon generation.
155 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
159 EXPORT_SYMBOL_GPL(rt2x00usb_beacon_update);
161 void rt2x00usb_beacondone(struct urb *urb)
163 struct data_entry *entry = (struct data_entry*)urb->context;
164 struct data_ring *ring = entry->ring;
166 if (!test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags))
170 * Check if this was the guardian beacon,
171 * if that was the case we need to send the real beacon now.
172 * Otherwise we should free the sk_buffer, the device
173 * should be doing the rest of the work now.
175 if (ring->index == 1) {
176 rt2x00_ring_index_done_inc(ring);
177 entry = rt2x00_get_data_entry(ring);
178 usb_submit_urb(entry->priv, GFP_ATOMIC);
179 rt2x00_ring_index_inc(ring);
180 } else if (ring->index_done == 1) {
181 entry = rt2x00_get_data_entry_done(ring);
183 dev_kfree_skb(entry->skb);
186 rt2x00_ring_index_done_inc(ring);
189 EXPORT_SYMBOL_GPL(rt2x00usb_beacondone);
194 static void rt2x00usb_interrupt_txdone(struct urb *urb)
196 struct data_entry *entry = (struct data_entry*)urb->context;
197 struct data_ring *ring = entry->ring;
198 struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
199 struct data_desc *txd = (struct data_desc *)entry->skb->data;
203 if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
204 !__test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
207 rt2x00_desc_read(txd, 0, &word);
210 * Remove the descriptor data from the buffer.
212 skb_pull(entry->skb, ring->desc_size);
215 * Obtain the status about this packet.
217 tx_status = !urb->status ? TX_SUCCESS : TX_FAIL_RETRY;
219 rt2x00lib_txdone(entry, tx_status, 0);
222 * Make this entry available for reuse.
225 rt2x00_ring_index_done_inc(entry->ring);
228 * If the data ring was full before the txdone handler
229 * we must make sure the packet queue in the mac80211 stack
230 * is reenabled when the txdone handler has finished.
232 if (!rt2x00_ring_full(ring))
233 ieee80211_wake_queue(rt2x00dev->hw,
234 entry->tx_status.control.queue);
237 int rt2x00usb_write_tx_data(struct rt2x00_dev *rt2x00dev,
238 struct data_ring *ring, struct sk_buff *skb,
239 struct ieee80211_tx_control *control)
241 struct usb_device *usb_dev =
242 interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
243 struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr*)skb->data;
244 struct data_entry *entry = rt2x00_get_data_entry(ring);
245 struct data_desc *txd;
246 u32 length = skb->len;
248 if (rt2x00_ring_full(ring)) {
249 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
253 if (test_bit(ENTRY_OWNER_NIC, &entry->flags)) {
255 "Arrived at non-free entry in the non-full queue %d.\n"
256 "Please file bug report to %s.\n",
257 control->queue, DRV_PROJECT);
258 ieee80211_stop_queue( rt2x00dev->hw, control->queue);
262 skb_push(skb, rt2x00dev->hw->extra_tx_headroom);
263 txd = (struct data_desc*)skb->data;
264 rt2x00lib_write_tx_desc(rt2x00dev, entry, txd, ieee80211hdr,
266 memcpy(&entry->tx_status.control, control, sizeof(*control));
270 * Length passed to usb_fill_urb cannot be an odd number,
271 * so add 1 byte to make it even.
273 length += rt2x00dev->hw->extra_tx_headroom;
277 __set_bit(ENTRY_OWNER_NIC, &entry->flags);
281 usb_sndbulkpipe(usb_dev, 1),
284 rt2x00usb_interrupt_txdone,
286 usb_submit_urb(entry->priv, GFP_ATOMIC);
288 rt2x00_ring_index_inc(ring);
290 if (rt2x00_ring_full(ring))
291 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
295 EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
300 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
302 struct data_entry *entry = (struct data_entry*)urb->context;
303 struct data_ring *ring = entry->ring;
304 struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
310 if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
311 !test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
315 * Check if the received data is simply too small
316 * to be actually valid, or if the urb is signaling
319 if (urb->actual_length < entry->ring->desc_size || urb->status)
322 size = rt2x00dev->ops->lib->fill_rxdone(entry, &signal, &rssi, &ofdm);
327 * Trim the skb_buffer to only contain the valid
328 * frame data (so ignore the device's descriptor).
330 skb_trim(entry->skb, size);
333 * Send the packet to upper layer, and update urb.
335 rt2x00lib_rxdone(entry, NULL, ring->data_size + ring->desc_size,
337 urb->transfer_buffer = entry->skb->data;
338 urb->transfer_buffer_length = entry->skb->len;
341 if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
342 __set_bit(ENTRY_OWNER_NIC, &entry->flags);
343 usb_submit_urb(urb, GFP_ATOMIC);
346 rt2x00_ring_index_inc(ring);
352 void rt2x00usb_enable_radio(struct rt2x00_dev *rt2x00dev)
354 struct usb_device *usb_dev =
355 interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
356 struct data_ring *ring;
357 struct data_entry *entry;
361 * Initialize the TX rings
363 txringall_for_each(rt2x00dev, ring) {
364 for (i = 0; i < ring->stats.limit; i++)
365 ring->entry[i].flags = 0;
367 rt2x00_ring_index_clear(ring);
371 * Initialize and start the RX ring.
373 rt2x00_ring_index_clear(rt2x00dev->rx);
375 for (i = 0; i < rt2x00dev->rx->stats.limit; i++) {
376 entry = &rt2x00dev->rx->entry[i];
381 usb_rcvbulkpipe(usb_dev, 1),
384 rt2x00usb_interrupt_rxdone,
387 __set_bit(ENTRY_OWNER_NIC, &entry->flags);
388 usb_submit_urb(entry->priv, GFP_ATOMIC);
391 EXPORT_SYMBOL_GPL(rt2x00usb_enable_radio);
393 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
395 struct data_ring *ring;
398 rt2x00usb_vendor_request(rt2x00dev, USB_RX_CONTROL,
399 USB_VENDOR_REQUEST_OUT, 0x00, 0x00, NULL, 0, REGISTER_TIMEOUT);
404 ring_for_each(rt2x00dev, ring) {
405 for (i = 0; i < ring->stats.limit; i++)
406 usb_kill_urb(ring->entry[i].priv);
409 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
412 * Device initialization handlers.
414 static int rt2x00usb_alloc_ring(struct rt2x00_dev *rt2x00dev,
415 struct data_ring *ring)
422 for (i = 0; i < ring->stats.limit; i++) {
423 ring->entry[i].priv = usb_alloc_urb(0, GFP_KERNEL);
424 if (!ring->entry[i].priv)
431 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
433 struct data_ring *ring;
435 unsigned int entry_size;
442 ring_for_each(rt2x00dev, ring) {
443 status = rt2x00usb_alloc_ring(rt2x00dev, ring);
449 * For the RX ring, skb's should be allocated.
451 entry_size = ring->data_size + ring->desc_size;
452 for (i = 0; i < rt2x00dev->rx->stats.limit; i++) {
453 skb = dev_alloc_skb(NET_IP_ALIGN + entry_size);
457 skb_reserve(skb, NET_IP_ALIGN);
458 skb_put(skb, entry_size);
460 rt2x00dev->rx->entry[i].skb = skb;
466 rt2x00usb_uninitialize(rt2x00dev);
470 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
472 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
474 struct data_ring *ring;
477 ring_for_each(rt2x00dev, ring) {
481 for (i = 0; i < ring->stats.limit; i++) {
482 usb_kill_urb(ring->entry[i].priv);
483 usb_free_urb(ring->entry[i].priv);
484 if (ring->entry[i].skb)
485 kfree_skb(ring->entry[i].skb);
489 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
492 * USB driver handlers.
494 int rt2x00usb_probe(struct usb_interface *usb_intf,
495 const struct usb_device_id *id)
497 struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
498 struct rt2x00_ops *ops = (struct rt2x00_ops*)id->driver_info;
499 struct ieee80211_hw *hw;
500 struct rt2x00_dev *rt2x00dev;
503 usb_dev = usb_get_dev(usb_dev);
505 hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
507 ERROR_PROBE("Failed to allocate hardware.\n");
509 goto exit_put_device;
512 usb_set_intfdata(usb_intf, hw);
514 rt2x00dev = hw->priv;
515 rt2x00dev->dev = usb_intf;
516 rt2x00dev->ops = ops;
519 retval = rt2x00lib_probe_dev(rt2x00dev);
521 goto exit_free_device;
526 ieee80211_free_hw(hw);
529 usb_put_dev(usb_dev);
531 usb_set_intfdata(usb_intf, NULL);
535 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
537 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
539 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
540 struct rt2x00_dev *rt2x00dev = hw->priv;
543 * Free all allocated data.
545 rt2x00lib_remove_dev(rt2x00dev);
546 ieee80211_free_hw(hw);
549 * Free the USB device data.
551 usb_set_intfdata(usb_intf, NULL);
552 usb_put_dev(interface_to_usbdev(usb_intf));
554 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
557 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
559 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
560 struct rt2x00_dev *rt2x00dev = hw->priv;
563 retval = rt2x00lib_suspend(rt2x00dev, state);
568 * Decrease usbdev refcount.
570 usb_put_dev(interface_to_usbdev(usb_intf));
574 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
576 int rt2x00usb_resume(struct usb_interface *usb_intf)
578 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
579 struct rt2x00_dev *rt2x00dev = hw->priv;
581 usb_get_dev(interface_to_usbdev(usb_intf));
583 return rt2x00lib_resume(rt2x00dev);
585 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
586 #endif /* CONFIG_PM */
589 * rt2x00pci module information.
591 MODULE_AUTHOR(DRV_PROJECT);
592 MODULE_VERSION(DRV_VERSION);
593 MODULE_DESCRIPTION("rt2x00 library");
594 MODULE_LICENSE("GPL");