/*
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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/bug.h>
#include "rt2x00.h"
#include "rt2x00usb.h"
/*
* Interfacing with the HW.
*/
int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
const u8 request, const u8 requesttype,
const u16 offset, const u16 value,
void *buffer, const u16 buffer_length,
const int timeout)
{
struct usb_device *usb_dev =
interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
int status;
unsigned int i;
unsigned int pipe =
(requesttype == USB_VENDOR_REQUEST_IN) ?
usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
status = usb_control_msg(usb_dev, pipe, request, requesttype,
value, offset, buffer, buffer_length,
timeout);
if (status >= 0)
return 0;
/*
* Check for errors
* -ENODEV: Device has disappeared, no point continuing.
* All other errors: Try again.
*/
else if (status == -ENODEV)
break;
}
ERROR(rt2x00dev,
"Vendor Request 0x%02x failed for offset 0x%04x with error %d.\n",
request, offset, status);
return status;
}
EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
const u8 request, const u8 requesttype,
const u16 offset, void *buffer,
const u16 buffer_length, const int timeout)
{
int status;
BUG_ON(!mutex_is_locked(&rt2x00dev->usb_cache_mutex));
/*
* Check for Cache availability.
*/
if (unlikely(!rt2x00dev->csr_cache || buffer_length > CSR_CACHE_SIZE)) {
ERROR(rt2x00dev, "CSR cache not available.\n");
return -ENOMEM;
}
if (requesttype == USB_VENDOR_REQUEST_OUT)
memcpy(rt2x00dev->csr_cache, buffer, buffer_length);
status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
offset, 0, rt2x00dev->csr_cache,
buffer_length, timeout);
if (!status && requesttype == USB_VENDOR_REQUEST_IN)
memcpy(buffer, rt2x00dev->csr_cache, buffer_length);
return status;
}
EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
const u8 request, const u8 requesttype,
const u16 offset, void *buffer,
const u16 buffer_length, const int timeout)
{
int status;
mutex_lock(&rt2x00dev->usb_cache_mutex);
status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
requesttype, offset, buffer,
buffer_length, timeout);
mutex_unlock(&rt2x00dev->usb_cache_mutex);
return status;
}
EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
/*
* 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;
__le32 *txd = (__le32 *)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 data_entry *entry = rt2x00_get_data_entry(ring);
struct skb_desc *desc;
u32 length;
if (rt2x00_ring_full(ring))
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);
return -EINVAL;
}
/*
* Add the descriptor in front of the skb.
*/
skb_push(skb, ring->desc_size);
memset(skb->data, 0, ring->desc_size);
/*
* Fill in skb descriptor
*/
desc = get_skb_desc(skb);
desc->desc_len = ring->desc_size;
desc->data_len = skb->len - ring->desc_size;
desc->desc = skb->data;
desc->data = skb->data + ring->desc_size;
desc->ring = ring;
desc->entry = entry;
rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
/*
* USB devices cannot blindly pass the skb->len as the
* length of the data to usb_fill_bulk_urb. Pass the skb
* to the driver to determine what the length should be.
*/
length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, skb);
/*
* Initialize URB and send the frame to the device.
*/
__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);
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
/*
* RX data handlers.
*/
static void rt2x00usb_interrupt_rxdone(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 sk_buff *skb;
struct ieee80211_hdr *hdr;
struct skb_desc *skbdesc;
struct rxdata_entry_desc desc;
int header_size;
int frame_size;
if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
!test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
return;
/*
* Check if the received data is simply too small
* to be actually valid, or if the urb is signaling
* a problem.
*/
if (urb->actual_length < entry->ring->desc_size || urb->status)
goto skip_entry;
memset(&desc, 0, sizeof(desc));
rt2x00dev->ops->lib->fill_rxdone(entry, &desc);
/*
* Allocate a new sk buffer to replace the current one.
* If allocation fails, we should drop the current frame
* so we can recycle the existing sk buffer for the new frame.
* As alignment we use 2 and not NET_IP_ALIGN because we need
* to be sure we have 2 bytes room in the head. (NET_IP_ALIGN
* can be 0 on some hardware). We use these 2 bytes for frame
* alignment later, we assume that the chance that
* header_size % 4 == 2 is bigger then header_size % 2 == 0
* and thus optimize alignment by reserving the 2 bytes in
* advance.
*/
frame_size = entry->ring->data_size + entry->ring->desc_size;
skb = dev_alloc_skb(frame_size + 2);
if (!skb)
goto skip_entry;
skb_reserve(skb, 2);
skb_put(skb, frame_size);
/*
* The data behind the ieee80211 header must be
* aligned on a 4 byte boundary.
* After that trim the entire buffer down to only
* contain the valid frame data excluding the device
* descriptor.
*/
hdr = (struct ieee80211_hdr *)entry->skb->data;
header_size =
ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
if (header_size % 4 == 0) {
skb_push(entry->skb, 2);
memmove(entry->skb->data, entry->skb->data + 2, skb->len - 2);
}
skb_trim(entry->skb, desc.size);
/*
* Fill in skb descriptor
*/
skbdesc = get_skb_desc(entry->skb);
skbdesc->desc_len = entry->ring->desc_size;
skbdesc->data_len = entry->skb->len;
skbdesc->ring = ring;
skbdesc->entry = entry;
/*
* Send the frame to rt2x00lib for further processing.
*/
rt2x00lib_rxdone(entry, entry->skb, &desc);
/*
* Replace current entry's skb with the newly allocated one,
* and reinitialize the urb.
*/
entry->skb = skb;
urb->transfer_buffer = entry->skb->data;
urb->transfer_buffer_length = entry->skb->len;
skip_entry:
if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
__set_bit(ENTRY_OWNER_NIC, &entry->flags);
usb_submit_urb(urb, GFP_ATOMIC);
}
rt2x00_ring_index_inc(ring);
}
/*
* Radio handlers
*/
void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
{
struct data_ring *ring;
unsigned int i;
rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0x0000, 0x0000,
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);
/*
* Device initialization handlers.
*/
void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
struct data_entry *entry)
{
struct usb_device *usb_dev =
interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
usb_fill_bulk_urb(entry->priv, usb_dev,
usb_rcvbulkpipe(usb_dev, 1),
entry->skb->data, entry->skb->len,
rt2x00usb_interrupt_rxdone, entry);
__set_bit(ENTRY_OWNER_NIC, &entry->flags);
usb_submit_urb(entry->priv, GFP_ATOMIC);
}
EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
struct data_entry *entry)
{
entry->flags = 0;
}
EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
static int rt2x00usb_alloc_urb(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;
}
static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
struct data_ring *ring)
{
unsigned int i;
if (!ring->entry)
return;
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);
}
}
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_urb(rt2x00dev, ring);
if (status)
goto exit;
}
/*
* For the RX ring, skb's should be allocated.
*/
entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->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;
ring_for_each(rt2x00dev, ring)
rt2x00usb_free_urb(rt2x00dev, ring);
}
EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
/*
* USB driver handlers.
*/
static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
{
kfree(rt2x00dev->rf);
rt2x00dev->rf = NULL;
kfree(rt2x00dev->eeprom);
rt2x00dev->eeprom = NULL;
kfree(rt2x00dev->csr_cache);
rt2x00dev->csr_cache = NULL;
}
static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
{
rt2x00dev->csr_cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
if (!rt2x00dev->csr_cache)
goto exit;
rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
if (!rt2x00dev->eeprom)
goto exit;
rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
if (!rt2x00dev->rf)
goto exit;
return 0;
exit:
ERROR_PROBE("Failed to allocate registers.\n");
rt2x00usb_free_reg(rt2x00dev);
return -ENOMEM;
}
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->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");
