647 lines
15 KiB
C
647 lines
15 KiB
C
/*
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Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
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<http://rt2x00.serialmonkey.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the
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Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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Module: rt2x00usb
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Abstract: rt2x00 generic usb device routines.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/bug.h>
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#include "rt2x00.h"
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#include "rt2x00usb.h"
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/*
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* Interfacing with the HW.
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*/
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int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
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const u8 request, const u8 requesttype,
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const u16 offset, const u16 value,
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void *buffer, const u16 buffer_length,
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const int timeout)
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{
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struct usb_device *usb_dev =
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interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
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int status;
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unsigned int i;
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unsigned int pipe =
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(requesttype == USB_VENDOR_REQUEST_IN) ?
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usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
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for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
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status = usb_control_msg(usb_dev, pipe, request, requesttype,
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value, offset, buffer, buffer_length,
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timeout);
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if (status >= 0)
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return 0;
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/*
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* Check for errors
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* -ENODEV: Device has disappeared, no point continuing.
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* All other errors: Try again.
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*/
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else if (status == -ENODEV)
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break;
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}
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ERROR(rt2x00dev,
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"Vendor Request 0x%02x failed for offset 0x%04x with error %d.\n",
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request, offset, status);
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return status;
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}
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EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
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int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
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const u8 request, const u8 requesttype,
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const u16 offset, void *buffer,
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const u16 buffer_length, const int timeout)
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{
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int status;
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BUG_ON(!mutex_is_locked(&rt2x00dev->usb_cache_mutex));
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/*
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* Check for Cache availability.
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*/
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if (unlikely(!rt2x00dev->csr_cache || buffer_length > CSR_CACHE_SIZE)) {
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ERROR(rt2x00dev, "CSR cache not available.\n");
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return -ENOMEM;
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}
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if (requesttype == USB_VENDOR_REQUEST_OUT)
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memcpy(rt2x00dev->csr_cache, buffer, buffer_length);
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status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
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offset, 0, rt2x00dev->csr_cache,
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buffer_length, timeout);
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if (!status && requesttype == USB_VENDOR_REQUEST_IN)
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memcpy(buffer, rt2x00dev->csr_cache, buffer_length);
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return status;
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}
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EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
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int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
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const u8 request, const u8 requesttype,
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const u16 offset, void *buffer,
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const u16 buffer_length, const int timeout)
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{
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int status;
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mutex_lock(&rt2x00dev->usb_cache_mutex);
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status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
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requesttype, offset, buffer,
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buffer_length, timeout);
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mutex_unlock(&rt2x00dev->usb_cache_mutex);
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return status;
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}
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EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
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/*
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* TX data handlers.
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*/
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static void rt2x00usb_interrupt_txdone(struct urb *urb)
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{
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struct data_entry *entry = (struct data_entry *)urb->context;
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struct data_ring *ring = entry->ring;
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struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
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__le32 *txd = (__le32 *)entry->skb->data;
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u32 word;
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int tx_status;
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if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
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!__test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
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return;
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rt2x00_desc_read(txd, 0, &word);
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/*
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* Remove the descriptor data from the buffer.
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*/
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skb_pull(entry->skb, ring->desc_size);
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/*
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* Obtain the status about this packet.
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*/
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tx_status = !urb->status ? TX_SUCCESS : TX_FAIL_RETRY;
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rt2x00lib_txdone(entry, tx_status, 0);
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/*
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* Make this entry available for reuse.
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*/
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entry->flags = 0;
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rt2x00_ring_index_done_inc(entry->ring);
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/*
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* If the data ring was full before the txdone handler
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* we must make sure the packet queue in the mac80211 stack
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* is reenabled when the txdone handler has finished.
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*/
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if (!rt2x00_ring_full(ring))
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ieee80211_wake_queue(rt2x00dev->hw,
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entry->tx_status.control.queue);
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}
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int rt2x00usb_write_tx_data(struct rt2x00_dev *rt2x00dev,
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struct data_ring *ring, struct sk_buff *skb,
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struct ieee80211_tx_control *control)
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{
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struct usb_device *usb_dev =
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interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
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struct data_entry *entry = rt2x00_get_data_entry(ring);
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struct skb_desc *desc;
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u32 length;
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if (rt2x00_ring_full(ring))
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return -EINVAL;
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if (test_bit(ENTRY_OWNER_NIC, &entry->flags)) {
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ERROR(rt2x00dev,
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"Arrived at non-free entry in the non-full queue %d.\n"
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"Please file bug report to %s.\n",
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control->queue, DRV_PROJECT);
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return -EINVAL;
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}
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/*
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* Add the descriptor in front of the skb.
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*/
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skb_push(skb, ring->desc_size);
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memset(skb->data, 0, ring->desc_size);
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/*
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* Fill in skb descriptor
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*/
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desc = get_skb_desc(skb);
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desc->desc_len = ring->desc_size;
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desc->data_len = skb->len - ring->desc_size;
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desc->desc = skb->data;
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desc->data = skb->data + ring->desc_size;
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desc->ring = ring;
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desc->entry = entry;
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rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
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/*
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* USB devices cannot blindly pass the skb->len as the
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* length of the data to usb_fill_bulk_urb. Pass the skb
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* to the driver to determine what the length should be.
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*/
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length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, skb);
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/*
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* Initialize URB and send the frame to the device.
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*/
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__set_bit(ENTRY_OWNER_NIC, &entry->flags);
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usb_fill_bulk_urb(entry->priv, usb_dev, usb_sndbulkpipe(usb_dev, 1),
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skb->data, length, rt2x00usb_interrupt_txdone, entry);
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usb_submit_urb(entry->priv, GFP_ATOMIC);
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rt2x00_ring_index_inc(ring);
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return 0;
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}
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EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
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/*
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* RX data handlers.
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*/
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static void rt2x00usb_interrupt_rxdone(struct urb *urb)
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{
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struct data_entry *entry = (struct data_entry *)urb->context;
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struct data_ring *ring = entry->ring;
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struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
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struct sk_buff *skb;
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struct ieee80211_hdr *hdr;
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struct skb_desc *skbdesc;
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struct rxdata_entry_desc desc;
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int header_size;
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int frame_size;
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if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
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!test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
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return;
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/*
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* Check if the received data is simply too small
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* to be actually valid, or if the urb is signaling
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* a problem.
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*/
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if (urb->actual_length < entry->ring->desc_size || urb->status)
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goto skip_entry;
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memset(&desc, 0, sizeof(desc));
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rt2x00dev->ops->lib->fill_rxdone(entry, &desc);
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/*
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* Allocate a new sk buffer to replace the current one.
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* If allocation fails, we should drop the current frame
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* so we can recycle the existing sk buffer for the new frame.
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* As alignment we use 2 and not NET_IP_ALIGN because we need
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* to be sure we have 2 bytes room in the head. (NET_IP_ALIGN
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* can be 0 on some hardware). We use these 2 bytes for frame
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* alignment later, we assume that the chance that
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* header_size % 4 == 2 is bigger then header_size % 2 == 0
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* and thus optimize alignment by reserving the 2 bytes in
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* advance.
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*/
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frame_size = entry->ring->data_size + entry->ring->desc_size;
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skb = dev_alloc_skb(frame_size + 2);
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if (!skb)
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goto skip_entry;
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skb_reserve(skb, 2);
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skb_put(skb, frame_size);
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/*
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* The data behind the ieee80211 header must be
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* aligned on a 4 byte boundary.
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* After that trim the entire buffer down to only
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* contain the valid frame data excluding the device
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* descriptor.
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*/
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hdr = (struct ieee80211_hdr *)entry->skb->data;
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header_size =
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ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
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if (header_size % 4 == 0) {
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skb_push(entry->skb, 2);
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memmove(entry->skb->data, entry->skb->data + 2, skb->len - 2);
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}
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skb_trim(entry->skb, desc.size);
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/*
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* Fill in skb descriptor
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*/
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skbdesc = get_skb_desc(entry->skb);
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skbdesc->desc_len = entry->ring->desc_size;
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skbdesc->data_len = entry->skb->len;
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skbdesc->desc = entry->skb->data - skbdesc->desc_len;
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skbdesc->data = entry->skb->data;
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skbdesc->ring = ring;
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skbdesc->entry = entry;
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/*
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* Send the frame to rt2x00lib for further processing.
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*/
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rt2x00lib_rxdone(entry, entry->skb, &desc);
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/*
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* Replace current entry's skb with the newly allocated one,
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* and reinitialize the urb.
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*/
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entry->skb = skb;
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urb->transfer_buffer = entry->skb->data;
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urb->transfer_buffer_length = entry->skb->len;
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skip_entry:
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if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
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__set_bit(ENTRY_OWNER_NIC, &entry->flags);
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usb_submit_urb(urb, GFP_ATOMIC);
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}
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rt2x00_ring_index_inc(ring);
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}
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/*
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* Radio handlers
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*/
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void rt2x00usb_enable_radio(struct rt2x00_dev *rt2x00dev)
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{
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struct usb_device *usb_dev =
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interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
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struct data_ring *ring;
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struct data_entry *entry;
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unsigned int i;
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/*
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* Initialize the TX rings
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*/
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txringall_for_each(rt2x00dev, ring) {
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for (i = 0; i < ring->stats.limit; i++)
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ring->entry[i].flags = 0;
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rt2x00_ring_index_clear(ring);
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}
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/*
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* Initialize and start the RX ring.
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*/
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rt2x00_ring_index_clear(rt2x00dev->rx);
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for (i = 0; i < rt2x00dev->rx->stats.limit; i++) {
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entry = &rt2x00dev->rx->entry[i];
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usb_fill_bulk_urb(entry->priv, usb_dev,
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usb_rcvbulkpipe(usb_dev, 1),
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entry->skb->data, entry->skb->len,
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rt2x00usb_interrupt_rxdone, entry);
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__set_bit(ENTRY_OWNER_NIC, &entry->flags);
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usb_submit_urb(entry->priv, GFP_ATOMIC);
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}
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}
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EXPORT_SYMBOL_GPL(rt2x00usb_enable_radio);
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void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
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{
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struct data_ring *ring;
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unsigned int i;
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rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0x0000, 0x0000,
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REGISTER_TIMEOUT);
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/*
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* Cancel all rings.
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*/
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ring_for_each(rt2x00dev, ring) {
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for (i = 0; i < ring->stats.limit; i++)
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usb_kill_urb(ring->entry[i].priv);
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}
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}
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EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
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/*
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* Device initialization handlers.
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*/
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static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
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struct data_ring *ring)
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{
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unsigned int i;
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/*
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* Allocate the URB's
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*/
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for (i = 0; i < ring->stats.limit; i++) {
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ring->entry[i].priv = usb_alloc_urb(0, GFP_KERNEL);
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if (!ring->entry[i].priv)
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return -ENOMEM;
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}
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return 0;
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}
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static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
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struct data_ring *ring)
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{
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unsigned int i;
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if (!ring->entry)
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return;
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for (i = 0; i < ring->stats.limit; i++) {
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usb_kill_urb(ring->entry[i].priv);
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usb_free_urb(ring->entry[i].priv);
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if (ring->entry[i].skb)
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kfree_skb(ring->entry[i].skb);
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}
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}
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int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
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{
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struct data_ring *ring;
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struct sk_buff *skb;
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unsigned int entry_size;
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unsigned int i;
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int status;
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/*
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* Allocate DMA
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*/
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ring_for_each(rt2x00dev, ring) {
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status = rt2x00usb_alloc_urb(rt2x00dev, ring);
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if (status)
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goto exit;
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}
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/*
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* For the RX ring, skb's should be allocated.
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*/
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entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
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for (i = 0; i < rt2x00dev->rx->stats.limit; i++) {
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skb = dev_alloc_skb(NET_IP_ALIGN + entry_size);
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if (!skb)
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goto exit;
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skb_reserve(skb, NET_IP_ALIGN);
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skb_put(skb, entry_size);
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rt2x00dev->rx->entry[i].skb = skb;
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}
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return 0;
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exit:
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rt2x00usb_uninitialize(rt2x00dev);
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return status;
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}
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EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
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void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
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{
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struct data_ring *ring;
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ring_for_each(rt2x00dev, ring)
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rt2x00usb_free_urb(rt2x00dev, ring);
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}
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EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
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/*
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* USB driver handlers.
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*/
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static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
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{
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kfree(rt2x00dev->rf);
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rt2x00dev->rf = NULL;
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kfree(rt2x00dev->eeprom);
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rt2x00dev->eeprom = NULL;
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kfree(rt2x00dev->csr_cache);
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rt2x00dev->csr_cache = NULL;
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}
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static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
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{
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rt2x00dev->csr_cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
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if (!rt2x00dev->csr_cache)
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goto exit;
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rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
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if (!rt2x00dev->eeprom)
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goto exit;
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rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
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if (!rt2x00dev->rf)
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goto exit;
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return 0;
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exit:
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ERROR_PROBE("Failed to allocate registers.\n");
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rt2x00usb_free_reg(rt2x00dev);
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return -ENOMEM;
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}
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int rt2x00usb_probe(struct usb_interface *usb_intf,
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const struct usb_device_id *id)
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{
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struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
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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->ops = ops;
|
|
rt2x00dev->hw = hw;
|
|
mutex_init(&rt2x00dev->usb_cache_mutex);
|
|
|
|
rt2x00dev->usb_maxpacket =
|
|
usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
|
|
if (!rt2x00dev->usb_maxpacket)
|
|
rt2x00dev->usb_maxpacket = 1;
|
|
|
|
retval = rt2x00usb_alloc_reg(rt2x00dev);
|
|
if (retval)
|
|
goto exit_free_device;
|
|
|
|
retval = rt2x00lib_probe_dev(rt2x00dev);
|
|
if (retval)
|
|
goto exit_free_reg;
|
|
|
|
return 0;
|
|
|
|
exit_free_reg:
|
|
rt2x00usb_free_reg(rt2x00dev);
|
|
|
|
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);
|
|
rt2x00usb_free_reg(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;
|
|
|
|
rt2x00usb_free_reg(rt2x00dev);
|
|
|
|
/*
|
|
* 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;
|
|
int retval;
|
|
|
|
usb_get_dev(interface_to_usbdev(usb_intf));
|
|
|
|
retval = rt2x00usb_alloc_reg(rt2x00dev);
|
|
if (retval)
|
|
return retval;
|
|
|
|
retval = rt2x00lib_resume(rt2x00dev);
|
|
if (retval)
|
|
goto exit_free_reg;
|
|
|
|
return 0;
|
|
|
|
exit_free_reg:
|
|
rt2x00usb_free_reg(rt2x00dev);
|
|
|
|
return retval;
|
|
}
|
|
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");
|