drivers/net/wireless/rt2x00/rt2x00usb.h

   1 /*
   2         Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00usb
  23         Abstract: Data structures for the rt2x00usb module.
  24  */
  25
  26 #ifndef RT2X00USB_H
  27 #define RT2X00USB_H
  28
  29 #include <linux/usb.h>
  30
  31 #define to_usb_device_intf(d) \
  32 ({ \
  33         struct usb_interface *intf = to_usb_interface(d); \
  34         interface_to_usbdev(intf); \
  35 })
  36
  37 /*
  38  * This variable should be used with the
  39  * usb_driver structure initialization.
  40  */
  41 #define USB_DEVICE_DATA(__ops)  .driver_info = (kernel_ulong_t)(__ops)
  42
  43 /*
  44  * For USB vendor requests we need to pass a timeout
  45  * time in ms, for this we use the REGISTER_TIMEOUT,
  46  * however when loading firmware a higher value is
  47  * required. In that case we use the REGISTER_TIMEOUT_FIRMWARE.
  48  */
  49 #define REGISTER_TIMEOUT                500
  50 #define REGISTER_TIMEOUT_FIRMWARE       1000
  51
  52 /**
  53  * REGISTER_TIMEOUT16 - Determine the timeout for 16bit register access
  54  * @__datalen: Data length
  55  */
  56 #define REGISTER_TIMEOUT16(__datalen)   \
  57         ( REGISTER_TIMEOUT * ((__datalen) / sizeof(u16)) )
  58
  59 /**
  60  * REGISTER_TIMEOUT32 - Determine the timeout for 32bit register access
  61  * @__datalen: Data length
  62  */
  63 #define REGISTER_TIMEOUT32(__datalen)   \
  64         ( REGISTER_TIMEOUT * ((__datalen) / sizeof(u32)) )
  65
  66 /*
  67  * Cache size
  68  */
  69 #define CSR_CACHE_SIZE                  64
  70
  71 /*
  72  * USB request types.
  73  */
  74 #define USB_VENDOR_REQUEST      ( USB_TYPE_VENDOR | USB_RECIP_DEVICE )
  75 #define USB_VENDOR_REQUEST_IN   ( USB_DIR_IN | USB_VENDOR_REQUEST )
  76 #define USB_VENDOR_REQUEST_OUT  ( USB_DIR_OUT | USB_VENDOR_REQUEST )
  77
  78 /**
  79  * enum rt2x00usb_vendor_request: USB vendor commands.
  80  */
  81 enum rt2x00usb_vendor_request {
  82         USB_DEVICE_MODE = 1,
  83         USB_SINGLE_WRITE = 2,
  84         USB_SINGLE_READ = 3,
  85         USB_MULTI_WRITE = 6,
  86         USB_MULTI_READ = 7,
  87         USB_EEPROM_WRITE = 8,
  88         USB_EEPROM_READ = 9,
  89         USB_LED_CONTROL = 10, /* RT73USB */
  90         USB_RX_CONTROL = 12,
  91 };
  92
  93 /**
  94  * enum rt2x00usb_mode_offset: Device modes offset.
  95  */
  96 enum rt2x00usb_mode_offset {
  97         USB_MODE_RESET = 1,
  98         USB_MODE_UNPLUG = 2,
  99         USB_MODE_FUNCTION = 3,
 100         USB_MODE_TEST = 4,
 101         USB_MODE_SLEEP = 7,     /* RT73USB */
 102         USB_MODE_FIRMWARE = 8,  /* RT73USB */
 103         USB_MODE_WAKEUP = 9,    /* RT73USB */
 104 };
 105
 106 /**
 107  * rt2x00usb_vendor_request - Send register command to device
 108  * @rt2x00dev: Pointer to &struct rt2x00_dev
 109  * @request: USB vendor command (See &enum rt2x00usb_vendor_request)
 110  * @requesttype: Request type &USB_VENDOR_REQUEST_*
 111  * @offset: Register offset to perform action on
 112  * @value: Value to write to device
 113  * @buffer: Buffer where information will be read/written to by device
 114  * @buffer_length: Size of &buffer
 115  * @timeout: Operation timeout
 116  *
 117  * This is the main function to communicate with the device,
 118  * the &buffer argument _must_ either be NULL or point to
 119  * a buffer allocated by kmalloc. Failure to do so can lead
 120  * to unexpected behavior depending on the architecture.
 121  */
 122 int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
 123                              const u8 request, const u8 requesttype,
 124                              const u16 offset, const u16 value,
 125                              void *buffer, const u16 buffer_length,
 126                              const int timeout);
 127
 128 /**
 129  * rt2x00usb_vendor_request_buff - Send register command to device (buffered)
 130  * @rt2x00dev: Pointer to &struct rt2x00_dev
 131  * @request: USB vendor command (See &enum rt2x00usb_vendor_request)
 132  * @requesttype: Request type &USB_VENDOR_REQUEST_*
 133  * @offset: Register offset to perform action on
 134  * @buffer: Buffer where information will be read/written to by device
 135  * @buffer_length: Size of &buffer
 136  * @timeout: Operation timeout
 137  *
 138  * This function will use a previously with kmalloc allocated cache
 139  * to communicate with the device. The contents of the buffer pointer
 140  * will be copied to this cache when writing, or read from the cache
 141  * when reading.
 142  * Buffers send to &rt2x00usb_vendor_request _must_ be allocated with
 143  * kmalloc. Hence the reason for using a previously allocated cache
 144  * which has been allocated properly.
 145  */
 146 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
 147                                   const u8 request, const u8 requesttype,
 148                                   const u16 offset, void *buffer,
 149                                   const u16 buffer_length, const int timeout);
 150
 151 /**
 152  * rt2x00usb_vendor_request_buff - Send register command to device (buffered)
 153  * @rt2x00dev: Pointer to &struct rt2x00_dev
 154  * @request: USB vendor command (See &enum rt2x00usb_vendor_request)
 155  * @requesttype: Request type &USB_VENDOR_REQUEST_*
 156  * @offset: Register offset to perform action on
 157  * @buffer: Buffer where information will be read/written to by device
 158  * @buffer_length: Size of &buffer
 159  * @timeout: Operation timeout
 160  *
 161  * A version of &rt2x00usb_vendor_request_buff which must be called
 162  * if the usb_cache_mutex is already held.
 163  */
 164 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
 165                                    const u8 request, const u8 requesttype,
 166                                    const u16 offset, void *buffer,
 167                                    const u16 buffer_length, const int timeout);
 168
 169 /**
 170  * rt2x00usb_vendor_request_sw - Send single register command to device
 171  * @rt2x00dev: Pointer to &struct rt2x00_dev
 172  * @request: USB vendor command (See &enum rt2x00usb_vendor_request)
 173  * @offset: Register offset to perform action on
 174  * @value: Value to write to device
 175  * @timeout: Operation timeout
 176  *
 177  * Simple wrapper around rt2x00usb_vendor_request to write a single
 178  * command to the device. Since we don't use the buffer argument we
 179  * don't have to worry about kmalloc here.
 180  */
 181 static inline int rt2x00usb_vendor_request_sw(struct rt2x00_dev *rt2x00dev,
 182                                               const u8 request,
 183                                               const u16 offset,
 184                                               const u16 value,
 185                                               const int timeout)
 186 {
 187         return rt2x00usb_vendor_request(rt2x00dev, request,
 188                                         USB_VENDOR_REQUEST_OUT, offset,
 189                                         value, NULL, 0, timeout);
 190 }
 191
 192 /**
 193  * rt2x00usb_eeprom_read - Read eeprom from device
 194  * @rt2x00dev: Pointer to &struct rt2x00_dev
 195  * @eeprom: Pointer to eeprom array to store the information in
 196  * @length: Number of bytes to read from the eeprom
 197  *
 198  * Simple wrapper around rt2x00usb_vendor_request to read the eeprom
 199  * from the device. Note that the eeprom argument _must_ be allocated using
 200  * kmalloc for correct handling inside the kernel USB layer.
 201  */
 202 static inline int rt2x00usb_eeprom_read(struct rt2x00_dev *rt2x00dev,
 203                                         __le16 *eeprom, const u16 length)
 204 {
 205         return rt2x00usb_vendor_request(rt2x00dev, USB_EEPROM_READ,
 206                                         USB_VENDOR_REQUEST_IN, 0, 0,
 207                                         eeprom, length,
 208                                         REGISTER_TIMEOUT16(length));
 209 }
 210
 211 /**
 212  * rt2x00usb_register_read - Read 32bit register word
 213  * @rt2x00dev: Device pointer, see &struct rt2x00_dev.
 214  * @offset: Register offset
 215  * @value: Pointer to where register contents should be stored
 216  *
 217  * This function is a simple wrapper for 32bit register access
 218  * through rt2x00usb_vendor_request_buff().
 219  */
 220 static inline void rt2x00usb_register_read(struct rt2x00_dev *rt2x00dev,
 221                                            const unsigned int offset,
 222                                            u32 *value)
 223 {
 224         __le32 reg;
 225         rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_READ,
 226                                       USB_VENDOR_REQUEST_IN, offset,
 227                                       &reg, sizeof(reg), REGISTER_TIMEOUT);
 228         *value = le32_to_cpu(reg);
 229 }
 230
 231 /**
 232  * rt2x00usb_register_read_lock - Read 32bit register word
 233  * @rt2x00dev: Device pointer, see &struct rt2x00_dev.
 234  * @offset: Register offset
 235  * @value: Pointer to where register contents should be stored
 236  *
 237  * This function is a simple wrapper for 32bit register access
 238  * through rt2x00usb_vendor_req_buff_lock().
 239  */
 240 static inline void rt2x00usb_register_read_lock(struct rt2x00_dev *rt2x00dev,
 241                                                 const unsigned int offset,
 242                                                 u32 *value)
 243 {
 244         __le32 reg;
 245         rt2x00usb_vendor_req_buff_lock(rt2x00dev, USB_MULTI_READ,
 246                                        USB_VENDOR_REQUEST_IN, offset,
 247                                        &reg, sizeof(reg), REGISTER_TIMEOUT);
 248         *value = le32_to_cpu(reg);
 249 }
 250
 251 /**
 252  * rt2x00usb_register_multiread - Read 32bit register words
 253  * @rt2x00dev: Device pointer, see &struct rt2x00_dev.
 254  * @offset: Register offset
 255  * @value: Pointer to where register contents should be stored
 256  * @length: Length of the data
 257  *
 258  * This function is a simple wrapper for 32bit register access
 259  * through rt2x00usb_vendor_request_buff().
 260  */
 261 static inline void rt2x00usb_register_multiread(struct rt2x00_dev *rt2x00dev,
 262                                                 const unsigned int offset,
 263                                                 void *value, const u32 length)
 264 {
 265         rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_READ,
 266                                       USB_VENDOR_REQUEST_IN, offset,
 267                                       value, length,
 268                                       REGISTER_TIMEOUT32(length));
 269 }
 270
 271 /**
 272  * rt2x00usb_register_write - Write 32bit register word
 273  * @rt2x00dev: Device pointer, see &struct rt2x00_dev.
 274  * @offset: Register offset
 275  * @value: Data which should be written
 276  *
 277  * This function is a simple wrapper for 32bit register access
 278  * through rt2x00usb_vendor_request_buff().
 279  */
 280 static inline void rt2x00usb_register_write(struct rt2x00_dev *rt2x00dev,
 281                                             const unsigned int offset,
 282                                             u32 value)
 283 {
 284         __le32 reg = cpu_to_le32(value);
 285         rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_WRITE,
 286                                       USB_VENDOR_REQUEST_OUT, offset,
 287                                       &reg, sizeof(reg), REGISTER_TIMEOUT);
 288 }
 289
 290 /**
 291  * rt2x00usb_register_write_lock - Write 32bit register word
 292  * @rt2x00dev: Device pointer, see &struct rt2x00_dev.
 293  * @offset: Register offset
 294  * @value: Data which should be written
 295  *
 296  * This function is a simple wrapper for 32bit register access
 297  * through rt2x00usb_vendor_req_buff_lock().
 298  */
 299 static inline void rt2x00usb_register_write_lock(struct rt2x00_dev *rt2x00dev,
 300                                                  const unsigned int offset,
 301                                                  u32 value)
 302 {
 303         __le32 reg = cpu_to_le32(value);
 304         rt2x00usb_vendor_req_buff_lock(rt2x00dev, USB_MULTI_WRITE,
 305                                        USB_VENDOR_REQUEST_OUT, offset,
 306                                        &reg, sizeof(reg), REGISTER_TIMEOUT);
 307 }
 308
 309 /**
 310  * rt2x00usb_register_multiwrite - Write 32bit register words
 311  * @rt2x00dev: Device pointer, see &struct rt2x00_dev.
 312  * @offset: Register offset
 313  * @value: Data which should be written
 314  * @length: Length of the data
 315  *
 316  * This function is a simple wrapper for 32bit register access
 317  * through rt2x00usb_vendor_request_buff().
 318  */
 319 static inline void rt2x00usb_register_multiwrite(struct rt2x00_dev *rt2x00dev,
 320                                                  const unsigned int offset,
 321                                                  const void *value,
 322                                                  const u32 length)
 323 {
 324         rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_WRITE,
 325                                       USB_VENDOR_REQUEST_OUT, offset,
 326                                       (void *)value, length,
 327                                       REGISTER_TIMEOUT32(length));
 328 }
 329
 330 /**
 331  * rt2x00usb_regbusy_read - Read from register with busy check
 332  * @rt2x00dev: Device pointer, see &struct rt2x00_dev.
 333  * @offset: Register offset
 334  * @field: Field to check if register is busy
 335  * @reg: Pointer to where register contents should be stored
 336  *
 337  * This function will read the given register, and checks if the
 338  * register is busy. If it is, it will sleep for a couple of
 339  * microseconds before reading the register again. If the register
 340  * is not read after a certain timeout, this function will return
 341  * FALSE.
 342  */
 343 int rt2x00usb_regbusy_read(struct rt2x00_dev *rt2x00dev,
 344                            const unsigned int offset,
 345                            const struct rt2x00_field32 field,
 346                            u32 *reg);
 347
 348 /*
 349  * Radio handlers
 350  */
 351 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev);
 352
 353 /**
 354  * struct queue_entry_priv_usb: Per entry USB specific information
 355  *
 356  * @urb: Urb structure used for device communication.
 357  */
 358 struct queue_entry_priv_usb {
 359         struct urb *urb;
 360 };
 361
 362 /**
 363  * struct queue_entry_priv_usb_bcn: Per TX entry USB specific information
 364  *
 365  * The first section should match &struct queue_entry_priv_usb exactly.
 366  * rt2500usb can use this structure to send a guardian byte when working
 367  * with beacons.
 368  *
 369  * @urb: Urb structure used for device communication.
 370  * @guardian_data: Set to 0, used for sending the guardian data.
 371  * @guardian_urb: Urb structure used to send the guardian data.
 372  */
 373 struct queue_entry_priv_usb_bcn {
 374         struct urb *urb;
 375
 376         unsigned int guardian_data;
 377         struct urb *guardian_urb;
 378 };
 379
 380 /**
 381  * rt2x00usb_kick_queue - Kick data queue
 382  * @queue: Data queue to kick
 383  *
 384  * This will walk through all entries of the queue and push all pending
 385  * frames to the hardware as a single burst.
 386  */
 387 void rt2x00usb_kick_queue(struct data_queue *queue);
 388
 389 /**
 390  * rt2x00usb_flush_queue - Flush data queue
 391  * @queue: Data queue to stop
 392  *
 393  * This will walk through all entries of the queue and kill all
 394  * URB's which were send to the device.
 395  */
 396 void rt2x00usb_flush_queue(struct data_queue *queue);
 397
 398 /**
 399  * rt2x00usb_watchdog - Watchdog for USB communication
 400  * @rt2x00dev: Pointer to &struct rt2x00_dev
 401  *
 402  * Check the health of the USB communication and determine
 403  * if timeouts have occured. If this is the case, this function
 404  * will reset all communication to restore functionality again.
 405  */
 406 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev);
 407
 408 /*
 409  * Device initialization handlers.
 410  */
 411 void rt2x00usb_clear_entry(struct queue_entry *entry);
 412 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev);
 413 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev);
 414
 415 /*
 416  * USB driver handlers.
 417  */
 418 int rt2x00usb_probe(struct usb_interface *usb_intf,
 419                     const struct usb_device_id *id);
 420 void rt2x00usb_disconnect(struct usb_interface *usb_intf);
 421 #ifdef CONFIG_PM
 422 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state);
 423 int rt2x00usb_resume(struct usb_interface *usb_intf);
 424 #else
 425 #define rt2x00usb_suspend       NULL
 426 #define rt2x00usb_resume        NULL
 427 #endif /* CONFIG_PM */
 428
 429 #endif /* RT2X00USB_H */