e9dc51aa2b
We provide timeout value to rt2x00usb_vendor_request_buff() based on number of registers to process. That value is passed down to rt2x00usb_vendor_req_buff_lock() and ends in usb_control_msg(). But we do not read/write all registers in rt2x00usb_vendor_req_buff_lock() at once. We read/write them in chunks of 64 bytes in the loop, hence passed timeout value to low level is too big. Patch removes timeout argument from rt2x00usb_vendor_request_buff() and use short REGISTER_TIMEOUT in rt2x00usb_vendor_req_buff_lock(). That timeout value should be fine for 64 bytes and smaller requests. For EEPROM read we introduced new timeout value equal to 2 seconds. Patch fixes process uninterruptible sleep stalls for long period, when USB bus has problem to satisfy a request and we wait very long time on usb_start_wait_urb(). Reported-and-tested-by: Sakari Ailus <sakari.ailus@iki.fi> Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
424 lines
14 KiB
C
424 lines
14 KiB
C
/*
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Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
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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, see <http://www.gnu.org/licenses/>.
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*/
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/*
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Module: rt2x00usb
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Abstract: Data structures for the rt2x00usb module.
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*/
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#ifndef RT2X00USB_H
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#define RT2X00USB_H
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#include <linux/usb.h>
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#define to_usb_device_intf(d) \
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({ \
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struct usb_interface *intf = to_usb_interface(d); \
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interface_to_usbdev(intf); \
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})
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/*
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* For USB vendor requests we need to pass a timeout time in ms, for this we
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* use the REGISTER_TIMEOUT, however when loading firmware or read EEPROM
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* a higher value is required. In that case we use the REGISTER_TIMEOUT_FIRMWARE
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* and EEPROM_TIMEOUT.
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*/
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#define REGISTER_TIMEOUT 500
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#define REGISTER_TIMEOUT_FIRMWARE 1000
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#define EEPROM_TIMEOUT 2000
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/*
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* Cache size
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*/
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#define CSR_CACHE_SIZE 64
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/*
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* USB request types.
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*/
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#define USB_VENDOR_REQUEST ( USB_TYPE_VENDOR | USB_RECIP_DEVICE )
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#define USB_VENDOR_REQUEST_IN ( USB_DIR_IN | USB_VENDOR_REQUEST )
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#define USB_VENDOR_REQUEST_OUT ( USB_DIR_OUT | USB_VENDOR_REQUEST )
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/**
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* enum rt2x00usb_vendor_request: USB vendor commands.
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*/
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enum rt2x00usb_vendor_request {
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USB_DEVICE_MODE = 1,
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USB_SINGLE_WRITE = 2,
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USB_SINGLE_READ = 3,
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USB_MULTI_WRITE = 6,
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USB_MULTI_READ = 7,
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USB_EEPROM_WRITE = 8,
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USB_EEPROM_READ = 9,
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USB_LED_CONTROL = 10, /* RT73USB */
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USB_RX_CONTROL = 12,
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};
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/**
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* enum rt2x00usb_mode_offset: Device modes offset.
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*/
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enum rt2x00usb_mode_offset {
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USB_MODE_RESET = 1,
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USB_MODE_UNPLUG = 2,
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USB_MODE_FUNCTION = 3,
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USB_MODE_TEST = 4,
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USB_MODE_SLEEP = 7, /* RT73USB */
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USB_MODE_FIRMWARE = 8, /* RT73USB */
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USB_MODE_WAKEUP = 9, /* RT73USB */
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USB_MODE_AUTORUN = 17, /* RT2800USB */
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};
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/**
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* rt2x00usb_vendor_request - Send register command to device
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* @rt2x00dev: Pointer to &struct rt2x00_dev
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* @request: USB vendor command (See &enum rt2x00usb_vendor_request)
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* @requesttype: Request type &USB_VENDOR_REQUEST_*
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* @offset: Register offset to perform action on
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* @value: Value to write to device
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* @buffer: Buffer where information will be read/written to by device
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* @buffer_length: Size of &buffer
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* @timeout: Operation timeout
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*
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* This is the main function to communicate with the device,
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* the &buffer argument _must_ either be NULL or point to
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* a buffer allocated by kmalloc. Failure to do so can lead
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* to unexpected behavior depending on the architecture.
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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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* rt2x00usb_vendor_request_buff - Send register command to device (buffered)
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* @rt2x00dev: Pointer to &struct rt2x00_dev
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* @request: USB vendor command (See &enum rt2x00usb_vendor_request)
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* @requesttype: Request type &USB_VENDOR_REQUEST_*
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* @offset: Register offset to perform action on
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* @buffer: Buffer where information will be read/written to by device
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* @buffer_length: Size of &buffer
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*
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* This function will use a previously with kmalloc allocated cache
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* to communicate with the device. The contents of the buffer pointer
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* will be copied to this cache when writing, or read from the cache
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* when reading.
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* Buffers send to &rt2x00usb_vendor_request _must_ be allocated with
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* kmalloc. Hence the reason for using a previously allocated cache
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* which has been allocated properly.
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*/
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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);
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/**
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* rt2x00usb_vendor_request_buff - Send register command to device (buffered)
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* @rt2x00dev: Pointer to &struct rt2x00_dev
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* @request: USB vendor command (See &enum rt2x00usb_vendor_request)
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* @requesttype: Request type &USB_VENDOR_REQUEST_*
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* @offset: Register offset to perform action on
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* @buffer: Buffer where information will be read/written to by device
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* @buffer_length: Size of &buffer
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* @timeout: Operation timeout
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*
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* A version of &rt2x00usb_vendor_request_buff which must be called
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* if the usb_cache_mutex is already held.
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*/
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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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* rt2x00usb_vendor_request_sw - Send single register command to device
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* @rt2x00dev: Pointer to &struct rt2x00_dev
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* @request: USB vendor command (See &enum rt2x00usb_vendor_request)
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* @offset: Register offset to perform action on
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* @value: Value to write to device
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* @timeout: Operation timeout
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*
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* Simple wrapper around rt2x00usb_vendor_request to write a single
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* command to the device. Since we don't use the buffer argument we
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* don't have to worry about kmalloc here.
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*/
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static inline int rt2x00usb_vendor_request_sw(struct rt2x00_dev *rt2x00dev,
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const u8 request,
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const u16 offset,
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const u16 value,
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const int timeout)
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{
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return rt2x00usb_vendor_request(rt2x00dev, request,
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USB_VENDOR_REQUEST_OUT, offset,
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value, NULL, 0, timeout);
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}
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/**
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* rt2x00usb_eeprom_read - Read eeprom from device
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* @rt2x00dev: Pointer to &struct rt2x00_dev
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* @eeprom: Pointer to eeprom array to store the information in
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* @length: Number of bytes to read from the eeprom
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*
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* Simple wrapper around rt2x00usb_vendor_request to read the eeprom
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* from the device. Note that the eeprom argument _must_ be allocated using
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* kmalloc for correct handling inside the kernel USB layer.
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*/
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static inline int rt2x00usb_eeprom_read(struct rt2x00_dev *rt2x00dev,
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__le16 *eeprom, const u16 length)
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{
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return rt2x00usb_vendor_request(rt2x00dev, USB_EEPROM_READ,
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USB_VENDOR_REQUEST_IN, 0, 0,
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eeprom, length, EEPROM_TIMEOUT);
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}
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/**
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* rt2x00usb_register_read - Read 32bit register word
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* @rt2x00dev: Device pointer, see &struct rt2x00_dev.
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* @offset: Register offset
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* @value: Pointer to where register contents should be stored
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*
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* This function is a simple wrapper for 32bit register access
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* through rt2x00usb_vendor_request_buff().
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*/
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static inline void rt2x00usb_register_read(struct rt2x00_dev *rt2x00dev,
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const unsigned int offset,
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u32 *value)
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{
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__le32 reg;
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rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_READ,
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USB_VENDOR_REQUEST_IN, offset,
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®, sizeof(reg));
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*value = le32_to_cpu(reg);
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}
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/**
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* rt2x00usb_register_read_lock - Read 32bit register word
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* @rt2x00dev: Device pointer, see &struct rt2x00_dev.
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* @offset: Register offset
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* @value: Pointer to where register contents should be stored
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*
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* This function is a simple wrapper for 32bit register access
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* through rt2x00usb_vendor_req_buff_lock().
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*/
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static inline void rt2x00usb_register_read_lock(struct rt2x00_dev *rt2x00dev,
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const unsigned int offset,
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u32 *value)
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{
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__le32 reg;
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rt2x00usb_vendor_req_buff_lock(rt2x00dev, USB_MULTI_READ,
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USB_VENDOR_REQUEST_IN, offset,
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®, sizeof(reg), REGISTER_TIMEOUT);
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*value = le32_to_cpu(reg);
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}
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/**
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* rt2x00usb_register_multiread - Read 32bit register words
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* @rt2x00dev: Device pointer, see &struct rt2x00_dev.
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* @offset: Register offset
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* @value: Pointer to where register contents should be stored
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* @length: Length of the data
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*
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* This function is a simple wrapper for 32bit register access
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* through rt2x00usb_vendor_request_buff().
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*/
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static inline void rt2x00usb_register_multiread(struct rt2x00_dev *rt2x00dev,
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const unsigned int offset,
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void *value, const u32 length)
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{
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rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_READ,
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USB_VENDOR_REQUEST_IN, offset,
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value, length);
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}
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/**
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* rt2x00usb_register_write - Write 32bit register word
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* @rt2x00dev: Device pointer, see &struct rt2x00_dev.
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* @offset: Register offset
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* @value: Data which should be written
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*
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* This function is a simple wrapper for 32bit register access
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* through rt2x00usb_vendor_request_buff().
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*/
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static inline void rt2x00usb_register_write(struct rt2x00_dev *rt2x00dev,
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const unsigned int offset,
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u32 value)
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{
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__le32 reg = cpu_to_le32(value);
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rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_WRITE,
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USB_VENDOR_REQUEST_OUT, offset,
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®, sizeof(reg));
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}
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/**
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* rt2x00usb_register_write_lock - Write 32bit register word
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* @rt2x00dev: Device pointer, see &struct rt2x00_dev.
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* @offset: Register offset
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* @value: Data which should be written
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*
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* This function is a simple wrapper for 32bit register access
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* through rt2x00usb_vendor_req_buff_lock().
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*/
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static inline void rt2x00usb_register_write_lock(struct rt2x00_dev *rt2x00dev,
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const unsigned int offset,
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u32 value)
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{
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__le32 reg = cpu_to_le32(value);
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rt2x00usb_vendor_req_buff_lock(rt2x00dev, USB_MULTI_WRITE,
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USB_VENDOR_REQUEST_OUT, offset,
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®, sizeof(reg), REGISTER_TIMEOUT);
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}
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/**
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* rt2x00usb_register_multiwrite - Write 32bit register words
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* @rt2x00dev: Device pointer, see &struct rt2x00_dev.
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* @offset: Register offset
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* @value: Data which should be written
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* @length: Length of the data
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*
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* This function is a simple wrapper for 32bit register access
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* through rt2x00usb_vendor_request_buff().
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*/
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static inline void rt2x00usb_register_multiwrite(struct rt2x00_dev *rt2x00dev,
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const unsigned int offset,
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const void *value,
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const u32 length)
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{
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rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_WRITE,
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USB_VENDOR_REQUEST_OUT, offset,
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(void *)value, length);
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}
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/**
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* rt2x00usb_regbusy_read - Read from register with busy check
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* @rt2x00dev: Device pointer, see &struct rt2x00_dev.
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* @offset: Register offset
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* @field: Field to check if register is busy
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* @reg: Pointer to where register contents should be stored
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*
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* This function will read the given register, and checks if the
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* register is busy. If it is, it will sleep for a couple of
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* microseconds before reading the register again. If the register
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* is not read after a certain timeout, this function will return
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* FALSE.
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*/
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int rt2x00usb_regbusy_read(struct rt2x00_dev *rt2x00dev,
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const unsigned int offset,
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const struct rt2x00_field32 field,
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u32 *reg);
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/**
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* rt2x00usb_register_read_async - Asynchronously read 32bit register word
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* @rt2x00dev: Device pointer, see &struct rt2x00_dev.
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* @offset: Register offset
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* @callback: Functon to call when read completes.
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*
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* Submit a control URB to read a 32bit register. This safe to
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* be called from atomic context. The callback will be called
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* when the URB completes. Otherwise the function is similar
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* to rt2x00usb_register_read().
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* When the callback function returns false, the memory will be cleaned up,
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* when it returns true, the urb will be fired again.
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*/
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void rt2x00usb_register_read_async(struct rt2x00_dev *rt2x00dev,
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const unsigned int offset,
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bool (*callback)(struct rt2x00_dev*, int, u32));
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/*
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* Radio handlers
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*/
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void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev);
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/**
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* struct queue_entry_priv_usb: Per entry USB specific information
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*
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* @urb: Urb structure used for device communication.
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*/
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struct queue_entry_priv_usb {
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struct urb *urb;
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};
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/**
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* struct queue_entry_priv_usb_bcn: Per TX entry USB specific information
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*
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* The first section should match &struct queue_entry_priv_usb exactly.
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* rt2500usb can use this structure to send a guardian byte when working
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* with beacons.
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*
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* @urb: Urb structure used for device communication.
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* @guardian_data: Set to 0, used for sending the guardian data.
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* @guardian_urb: Urb structure used to send the guardian data.
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*/
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struct queue_entry_priv_usb_bcn {
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struct urb *urb;
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unsigned int guardian_data;
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struct urb *guardian_urb;
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};
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/**
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* rt2x00usb_kick_queue - Kick data queue
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* @queue: Data queue to kick
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*
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* This will walk through all entries of the queue and push all pending
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* frames to the hardware as a single burst.
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*/
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void rt2x00usb_kick_queue(struct data_queue *queue);
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/**
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* rt2x00usb_flush_queue - Flush data queue
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* @queue: Data queue to stop
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* @drop: True to drop all pending frames.
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*
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* This will walk through all entries of the queue and will optionally
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* kill all URB's which were send to the device, or at least wait until
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* they have been returned from the device..
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*/
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void rt2x00usb_flush_queue(struct data_queue *queue, bool drop);
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/**
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* rt2x00usb_watchdog - Watchdog for USB communication
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* @rt2x00dev: Pointer to &struct rt2x00_dev
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*
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* Check the health of the USB communication and determine
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* if timeouts have occurred. If this is the case, this function
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* will reset all communication to restore functionality again.
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*/
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void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev);
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/*
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* Device initialization handlers.
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*/
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void rt2x00usb_clear_entry(struct queue_entry *entry);
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int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev);
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void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev);
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/*
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* USB driver handlers.
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*/
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int rt2x00usb_probe(struct usb_interface *usb_intf,
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const struct rt2x00_ops *ops);
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void rt2x00usb_disconnect(struct usb_interface *usb_intf);
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#ifdef CONFIG_PM
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int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state);
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int rt2x00usb_resume(struct usb_interface *usb_intf);
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#else
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#define rt2x00usb_suspend NULL
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#define rt2x00usb_resume NULL
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#endif /* CONFIG_PM */
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#endif /* RT2X00USB_H */
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