forked from Minki/linux
3d82346c5d
There is a buffer, csr_cache which is used to hold copies of data being passed to the USB stack which can get corrupted if multiple threads attempt to access CSR registers simultaneously. There is also the possibility if multiple threads try to access BBP or RF registers for the multiple USB operations needed to get interleaved leading to incorrect results. This patch introduces a mutex to prevent such simultaneous access. The interleaved access problem may also affect the PCI devices but if so that will be handled in a follow-up patch. Signed-off-by: Adam Baker <linux@baker-net.org.uk> Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
188 lines
5.8 KiB
C
188 lines
5.8 KiB
C
/*
|
|
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: Data structures for the rt2x00usb module.
|
|
*/
|
|
|
|
#ifndef RT2X00USB_H
|
|
#define RT2X00USB_H
|
|
|
|
/*
|
|
* This variable should be used with the
|
|
* usb_driver structure initialization.
|
|
*/
|
|
#define USB_DEVICE_DATA(__ops) .driver_info = (kernel_ulong_t)(__ops)
|
|
|
|
/*
|
|
* Register defines.
|
|
* Some registers require multiple attempts before success,
|
|
* in those cases REGISTER_BUSY_COUNT attempts should be
|
|
* taken with a REGISTER_BUSY_DELAY interval.
|
|
* For USB vendor requests we need to pass a timeout
|
|
* time in ms, for this we use the REGISTER_TIMEOUT,
|
|
* however when loading firmware a higher value is
|
|
* required. In that case we use the REGISTER_TIMEOUT_FIRMWARE.
|
|
*/
|
|
#define REGISTER_BUSY_COUNT 5
|
|
#define REGISTER_BUSY_DELAY 100
|
|
#define REGISTER_TIMEOUT 500
|
|
#define REGISTER_TIMEOUT_FIRMWARE 1000
|
|
|
|
/*
|
|
* Cache size
|
|
*/
|
|
#define CSR_CACHE_SIZE 8
|
|
#define CSR_CACHE_SIZE_FIRMWARE 64
|
|
|
|
/*
|
|
* USB request types.
|
|
*/
|
|
#define USB_VENDOR_REQUEST ( USB_TYPE_VENDOR | USB_RECIP_DEVICE )
|
|
#define USB_VENDOR_REQUEST_IN ( USB_DIR_IN | USB_VENDOR_REQUEST )
|
|
#define USB_VENDOR_REQUEST_OUT ( USB_DIR_OUT | USB_VENDOR_REQUEST )
|
|
|
|
/*
|
|
* USB vendor commands.
|
|
*/
|
|
#define USB_DEVICE_MODE 0x01
|
|
#define USB_SINGLE_WRITE 0x02
|
|
#define USB_SINGLE_READ 0x03
|
|
#define USB_MULTI_WRITE 0x06
|
|
#define USB_MULTI_READ 0x07
|
|
#define USB_EEPROM_WRITE 0x08
|
|
#define USB_EEPROM_READ 0x09
|
|
#define USB_LED_CONTROL 0x0a /* RT73USB */
|
|
#define USB_RX_CONTROL 0x0c
|
|
|
|
/*
|
|
* Device modes offset
|
|
*/
|
|
#define USB_MODE_RESET 0x01
|
|
#define USB_MODE_UNPLUG 0x02
|
|
#define USB_MODE_FUNCTION 0x03
|
|
#define USB_MODE_TEST 0x04
|
|
#define USB_MODE_SLEEP 0x07 /* RT73USB */
|
|
#define USB_MODE_FIRMWARE 0x08 /* RT73USB */
|
|
#define USB_MODE_WAKEUP 0x09 /* RT73USB */
|
|
|
|
/*
|
|
* Used to read/write from/to the device.
|
|
* This is the main function to communicate with the device,
|
|
* the buffer argument _must_ either be NULL or point to
|
|
* a buffer allocated by kmalloc. Failure to do so can lead
|
|
* to unexpected behavior depending on the architecture.
|
|
*/
|
|
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);
|
|
|
|
/*
|
|
* Used to read/write from/to the device.
|
|
* This function will use a previously with kmalloc allocated cache
|
|
* to communicate with the device. The contents of the buffer pointer
|
|
* will be copied to this cache when writing, or read from the cache
|
|
* when reading.
|
|
* Buffers send to rt2x00usb_vendor_request _must_ be allocated with
|
|
* kmalloc. Hence the reason for using a previously allocated cache
|
|
* which has been allocated properly.
|
|
*/
|
|
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);
|
|
|
|
/*
|
|
* A version of rt2x00usb_vendor_request_buff which must be called
|
|
* if the usb_cache_mutex is already held. */
|
|
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);
|
|
|
|
/*
|
|
* Simple wrapper around rt2x00usb_vendor_request to write a single
|
|
* command to the device. Since we don't use the buffer argument we
|
|
* don't have to worry about kmalloc here.
|
|
*/
|
|
static inline int rt2x00usb_vendor_request_sw(struct rt2x00_dev *rt2x00dev,
|
|
const u8 request,
|
|
const u16 offset,
|
|
const u16 value,
|
|
const int timeout)
|
|
{
|
|
return rt2x00usb_vendor_request(rt2x00dev, request,
|
|
USB_VENDOR_REQUEST_OUT, offset,
|
|
value, NULL, 0, timeout);
|
|
}
|
|
|
|
/*
|
|
* Simple wrapper around rt2x00usb_vendor_request to read the eeprom
|
|
* from the device. Note that the eeprom argument _must_ be allocated using
|
|
* kmalloc for correct handling inside the kernel USB layer.
|
|
*/
|
|
static inline int rt2x00usb_eeprom_read(struct rt2x00_dev *rt2x00dev,
|
|
__le16 *eeprom, const u16 lenght)
|
|
{
|
|
int timeout = REGISTER_TIMEOUT * (lenght / sizeof(u16));
|
|
|
|
return rt2x00usb_vendor_request(rt2x00dev, USB_EEPROM_READ,
|
|
USB_VENDOR_REQUEST_IN, 0x0000,
|
|
0x0000, eeprom, lenght, timeout);
|
|
}
|
|
|
|
/*
|
|
* Radio handlers
|
|
*/
|
|
void rt2x00usb_enable_radio(struct rt2x00_dev *rt2x00dev);
|
|
void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev);
|
|
|
|
/*
|
|
* TX data handlers.
|
|
*/
|
|
int rt2x00usb_write_tx_data(struct rt2x00_dev *rt2x00dev,
|
|
struct data_ring *ring, struct sk_buff *skb,
|
|
struct ieee80211_tx_control *control);
|
|
|
|
/*
|
|
* Device initialization handlers.
|
|
*/
|
|
int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev);
|
|
void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev);
|
|
|
|
/*
|
|
* USB driver handlers.
|
|
*/
|
|
int rt2x00usb_probe(struct usb_interface *usb_intf,
|
|
const struct usb_device_id *id);
|
|
void rt2x00usb_disconnect(struct usb_interface *usb_intf);
|
|
#ifdef CONFIG_PM
|
|
int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state);
|
|
int rt2x00usb_resume(struct usb_interface *usb_intf);
|
|
#else
|
|
#define rt2x00usb_suspend NULL
|
|
#define rt2x00usb_resume NULL
|
|
#endif /* CONFIG_PM */
|
|
|
|
#endif /* RT2X00USB_H */
|