drivers/net/wireless/ralink/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, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 /*
  20         Module: rt2x00usb
  21         Abstract: Data structures for the rt2x00usb module.
  22  */
  23
  24 #ifndef RT2X00USB_H
  25 #define RT2X00USB_H
  26
  27 #include <linux/usb.h>
  28
  29 #define to_usb_device_intf(d) \
  30 ({ \
  31         struct usb_interface *intf = to_usb_interface(d); \
  32         interface_to_usbdev(intf); \
  33 })
  34
  35 /*
  36  * For USB vendor requests we need to pass a timeout time in ms, for this we
  37  * use the REGISTER_TIMEOUT, however when loading firmware or read EEPROM
  38  * a higher value is required. In that case we use the REGISTER_TIMEOUT_FIRMWARE
  39  * and EEPROM_TIMEOUT.
  40  */
  41 #define REGISTER_TIMEOUT                100
  42 #define REGISTER_TIMEOUT_FIRMWARE       1000
  43 #define EEPROM_TIMEOUT                  2000
  44
  45 /*
  46  * Cache size
  47  */
  48 #define CSR_CACHE_SIZE                  64
  49
  50 /*
  51  * USB request types.
  52  */
  53 #define USB_VENDOR_REQUEST      ( USB_TYPE_VENDOR | USB_RECIP_DEVICE )
  54 #define USB_VENDOR_REQUEST_IN   ( USB_DIR_IN | USB_VENDOR_REQUEST )
  55 #define USB_VENDOR_REQUEST_OUT  ( USB_DIR_OUT | USB_VENDOR_REQUEST )
  56
  57 /**
  58  * enum rt2x00usb_vendor_request: USB vendor commands.
  59  */
  60 enum rt2x00usb_vendor_request {
  61         USB_DEVICE_MODE = 1,
  62         USB_SINGLE_WRITE = 2,
  63         USB_SINGLE_READ = 3,
  64         USB_MULTI_WRITE = 6,
  65         USB_MULTI_READ = 7,
  66         USB_EEPROM_WRITE = 8,
  67         USB_EEPROM_READ = 9,
  68         USB_LED_CONTROL = 10, /* RT73USB */
  69         USB_RX_CONTROL = 12,
  70 };
  71
  72 /**
  73  * enum rt2x00usb_mode_offset: Device modes offset.
  74  */
  75 enum rt2x00usb_mode_offset {
  76         USB_MODE_RESET = 1,
  77         USB_MODE_UNPLUG = 2,
  78         USB_MODE_FUNCTION = 3,
  79         USB_MODE_TEST = 4,
  80         USB_MODE_SLEEP = 7,     /* RT73USB */
  81         USB_MODE_FIRMWARE = 8,  /* RT73USB */
  82         USB_MODE_WAKEUP = 9,    /* RT73USB */
  83         USB_MODE_AUTORUN = 17, /* RT2800USB */
  84 };
  85
  86 /**
  87  * rt2x00usb_vendor_request - Send register command to device
  88  * @rt2x00dev: Pointer to &struct rt2x00_dev
  89  * @request: USB vendor command (See &enum rt2x00usb_vendor_request)
  90  * @requesttype: Request type &USB_VENDOR_REQUEST_*
  91  * @offset: Register offset to perform action on
  92  * @value: Value to write to device
  93  * @buffer: Buffer where information will be read/written to by device
  94  * @buffer_length: Size of &buffer
  95  * @timeout: Operation timeout
  96  *
  97  * This is the main function to communicate with the device,
  98  * the &buffer argument _must_ either be NULL or point to
  99  * a buffer allocated by kmalloc. Failure to do so can lead
 100  * to unexpected behavior depending on the architecture.
 101  */
 102 int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
 103                              const u8 request, const u8 requesttype,
 104                              const u16 offset, const u16 value,
 105                              void *buffer, const u16 buffer_length,
 106                              const int timeout);
 107
 108 /**
 109  * rt2x00usb_vendor_request_buff - Send register command to device (buffered)
 110  * @rt2x00dev: Pointer to &struct rt2x00_dev
 111  * @request: USB vendor command (See &enum rt2x00usb_vendor_request)
 112  * @requesttype: Request type &USB_VENDOR_REQUEST_*
 113  * @offset: Register offset to perform action on
 114  * @buffer: Buffer where information will be read/written to by device
 115  * @buffer_length: Size of &buffer
 116  *
 117  * This function will use a previously with kmalloc allocated cache
 118  * to communicate with the device. The contents of the buffer pointer
 119  * will be copied to this cache when writing, or read from the cache
 120  * when reading.
 121  * Buffers send to &rt2x00usb_vendor_request _must_ be allocated with
 122  * kmalloc. Hence the reason for using a previously allocated cache
 123  * which has been allocated properly.
 124  */
 125 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
 126                                   const u8 request, const u8 requesttype,
 127                                   const u16 offset, void *buffer,
 128                                   const u16 buffer_length);
 129
 130 /**
 131  * rt2x00usb_vendor_request_buff - Send register command to device (buffered)
 132  * @rt2x00dev: Pointer to &struct rt2x00_dev
 133  * @request: USB vendor command (See &enum rt2x00usb_vendor_request)
 134  * @requesttype: Request type &USB_VENDOR_REQUEST_*
 135  * @offset: Register offset to perform action on
 136  * @buffer: Buffer where information will be read/written to by device
 137  * @buffer_length: Size of &buffer
 138  * @timeout: Operation timeout
 139  *
 140  * A version of &rt2x00usb_vendor_request_buff which must be called
 141  * if the usb_cache_mutex is already held.
 142  */
 143 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
 144                                    const u8 request, const u8 requesttype,
 145                                    const u16 offset, void *buffer,
 146                                    const u16 buffer_length, const int timeout);
 147
 148 /**
 149  * rt2x00usb_vendor_request_sw - Send single register command to device
 150  * @rt2x00dev: Pointer to &struct rt2x00_dev
 151  * @request: USB vendor command (See &enum rt2x00usb_vendor_request)
 152  * @offset: Register offset to perform action on
 153  * @value: Value to write to device
 154  * @timeout: Operation timeout
 155  *
 156  * Simple wrapper around rt2x00usb_vendor_request to write a single
 157  * command to the device. Since we don't use the buffer argument we
 158  * don't have to worry about kmalloc here.
 159  */
 160 static inline int rt2x00usb_vendor_request_sw(struct rt2x00_dev *rt2x00dev,
 161                                               const u8 request,
 162                                               const u16 offset,
 163                                               const u16 value,
 164                                               const int timeout)
 165 {
 166         return rt2x00usb_vendor_request(rt2x00dev, request,
 167                                         USB_VENDOR_REQUEST_OUT, offset,
 168                                         value, NULL, 0, timeout);
 169 }
 170
 171 /**
 172  * rt2x00usb_eeprom_read - Read eeprom from device
 173  * @rt2x00dev: Pointer to &struct rt2x00_dev
 174  * @eeprom: Pointer to eeprom array to store the information in
 175  * @length: Number of bytes to read from the eeprom
 176  *
 177  * Simple wrapper around rt2x00usb_vendor_request to read the eeprom
 178  * from the device. Note that the eeprom argument _must_ be allocated using
 179  * kmalloc for correct handling inside the kernel USB layer.
 180  */
 181 static inline int rt2x00usb_eeprom_read(struct rt2x00_dev *rt2x00dev,
 182                                         __le16 *eeprom, const u16 length)
 183 {
 184         return rt2x00usb_vendor_request(rt2x00dev, USB_EEPROM_READ,
 185                                         USB_VENDOR_REQUEST_IN, 0, 0,
 186                                         eeprom, length, EEPROM_TIMEOUT);
 187 }
 188
 189 /**
 190  * rt2x00usb_register_read - Read 32bit register word
 191  * @rt2x00dev: Device pointer, see &struct rt2x00_dev.
 192  * @offset: Register offset
 193  *
 194  * This function is a simple wrapper for 32bit register access
 195  * through rt2x00usb_vendor_request_buff().
 196  */
 197 static inline u32 rt2x00usb_register_read(struct rt2x00_dev *rt2x00dev,
 198                                           const unsigned int offset)
 199 {
 200         __le32 reg = 0;
 201         rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_READ,
 202                                       USB_VENDOR_REQUEST_IN, offset,
 203                                       &reg, sizeof(reg));
 204         return le32_to_cpu(reg);
 205 }
 206
 207 /**
 208  * rt2x00usb_register_read_lock - Read 32bit register word
 209  * @rt2x00dev: Device pointer, see &struct rt2x00_dev.
 210  * @offset: Register offset
 211  *
 212  * This function is a simple wrapper for 32bit register access
 213  * through rt2x00usb_vendor_req_buff_lock().
 214  */
 215 static inline u32 rt2x00usb_register_read_lock(struct rt2x00_dev *rt2x00dev,
 216                                                const unsigned int offset)
 217 {
 218         __le32 reg = 0;
 219         rt2x00usb_vendor_req_buff_lock(rt2x00dev, USB_MULTI_READ,
 220                                        USB_VENDOR_REQUEST_IN, offset,
 221                                        &reg, sizeof(reg), REGISTER_TIMEOUT);
 222         return le32_to_cpu(reg);
 223 }
 224
 225 /**
 226  * rt2x00usb_register_multiread - Read 32bit register words
 227  * @rt2x00dev: Device pointer, see &struct rt2x00_dev.
 228  * @offset: Register offset
 229  * @value: Pointer to where register contents should be stored
 230  * @length: Length of the data
 231  *
 232  * This function is a simple wrapper for 32bit register access
 233  * through rt2x00usb_vendor_request_buff().
 234  */
 235 static inline void rt2x00usb_register_multiread(struct rt2x00_dev *rt2x00dev,
 236                                                 const unsigned int offset,
 237                                                 void *value, const u32 length)
 238 {
 239         rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_READ,
 240                                       USB_VENDOR_REQUEST_IN, offset,
 241                                       value, length);
 242 }
 243
 244 /**
 245  * rt2x00usb_register_write - Write 32bit register word
 246  * @rt2x00dev: Device pointer, see &struct rt2x00_dev.
 247  * @offset: Register offset
 248  * @value: Data which should be written
 249  *
 250  * This function is a simple wrapper for 32bit register access
 251  * through rt2x00usb_vendor_request_buff().
 252  */
 253 static inline void rt2x00usb_register_write(struct rt2x00_dev *rt2x00dev,
 254                                             const unsigned int offset,
 255                                             u32 value)
 256 {
 257         __le32 reg = cpu_to_le32(value);
 258         rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_WRITE,
 259                                       USB_VENDOR_REQUEST_OUT, offset,
 260                                       &reg, sizeof(reg));
 261 }
 262
 263 /**
 264  * rt2x00usb_register_write_lock - Write 32bit register word
 265  * @rt2x00dev: Device pointer, see &struct rt2x00_dev.
 266  * @offset: Register offset
 267  * @value: Data which should be written
 268  *
 269  * This function is a simple wrapper for 32bit register access
 270  * through rt2x00usb_vendor_req_buff_lock().
 271  */
 272 static inline void rt2x00usb_register_write_lock(struct rt2x00_dev *rt2x00dev,
 273                                                  const unsigned int offset,
 274                                                  u32 value)
 275 {
 276         __le32 reg = cpu_to_le32(value);
 277         rt2x00usb_vendor_req_buff_lock(rt2x00dev, USB_MULTI_WRITE,
 278                                        USB_VENDOR_REQUEST_OUT, offset,
 279                                        &reg, sizeof(reg), REGISTER_TIMEOUT);
 280 }
 281
 282 /**
 283  * rt2x00usb_register_multiwrite - Write 32bit register words
 284  * @rt2x00dev: Device pointer, see &struct rt2x00_dev.
 285  * @offset: Register offset
 286  * @value: Data which should be written
 287  * @length: Length of the data
 288  *
 289  * This function is a simple wrapper for 32bit register access
 290  * through rt2x00usb_vendor_request_buff().
 291  */
 292 static inline void rt2x00usb_register_multiwrite(struct rt2x00_dev *rt2x00dev,
 293                                                  const unsigned int offset,
 294                                                  const void *value,
 295                                                  const u32 length)
 296 {
 297         rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_WRITE,
 298                                       USB_VENDOR_REQUEST_OUT, offset,
 299                                       (void *)value, length);
 300 }
 301
 302 /**
 303  * rt2x00usb_regbusy_read - Read from register with busy check
 304  * @rt2x00dev: Device pointer, see &struct rt2x00_dev.
 305  * @offset: Register offset
 306  * @field: Field to check if register is busy
 307  * @reg: Pointer to where register contents should be stored
 308  *
 309  * This function will read the given register, and checks if the
 310  * register is busy. If it is, it will sleep for a couple of
 311  * microseconds before reading the register again. If the register
 312  * is not read after a certain timeout, this function will return
 313  * FALSE.
 314  */
 315 int rt2x00usb_regbusy_read(struct rt2x00_dev *rt2x00dev,
 316                            const unsigned int offset,
 317                            const struct rt2x00_field32 field,
 318                            u32 *reg);
 319
 320 /**
 321  * rt2x00usb_register_read_async - Asynchronously read 32bit register word
 322  * @rt2x00dev: Device pointer, see &struct rt2x00_dev.
 323  * @offset: Register offset
 324  * @callback: Functon to call when read completes.
 325  *
 326  * Submit a control URB to read a 32bit register. This safe to
 327  * be called from atomic context.  The callback will be called
 328  * when the URB completes. Otherwise the function is similar
 329  * to rt2x00usb_register_read().
 330  * When the callback function returns false, the memory will be cleaned up,
 331  * when it returns true, the urb will be fired again.
 332  */
 333 void rt2x00usb_register_read_async(struct rt2x00_dev *rt2x00dev,
 334                                    const unsigned int offset,
 335                                    bool (*callback)(struct rt2x00_dev*, int, u32));
 336
 337 /*
 338  * Radio handlers
 339  */
 340 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev);
 341
 342 /**
 343  * struct queue_entry_priv_usb: Per entry USB specific information
 344  *
 345  * @urb: Urb structure used for device communication.
 346  */
 347 struct queue_entry_priv_usb {
 348         struct urb *urb;
 349 };
 350
 351 /**
 352  * struct queue_entry_priv_usb_bcn: Per TX entry USB specific information
 353  *
 354  * The first section should match &struct queue_entry_priv_usb exactly.
 355  * rt2500usb can use this structure to send a guardian byte when working
 356  * with beacons.
 357  *
 358  * @urb: Urb structure used for device communication.
 359  * @guardian_data: Set to 0, used for sending the guardian data.
 360  * @guardian_urb: Urb structure used to send the guardian data.
 361  */
 362 struct queue_entry_priv_usb_bcn {
 363         struct urb *urb;
 364
 365         unsigned int guardian_data;
 366         struct urb *guardian_urb;
 367 };
 368
 369 /**
 370  * rt2x00usb_kick_queue - Kick data queue
 371  * @queue: Data queue to kick
 372  *
 373  * This will walk through all entries of the queue and push all pending
 374  * frames to the hardware as a single burst.
 375  */
 376 void rt2x00usb_kick_queue(struct data_queue *queue);
 377
 378 /**
 379  * rt2x00usb_flush_queue - Flush data queue
 380  * @queue: Data queue to stop
 381  * @drop: True to drop all pending frames.
 382  *
 383  * This will walk through all entries of the queue and will optionally
 384  * kill all URB's which were send to the device, or at least wait until
 385  * they have been returned from the device..
 386  */
 387 void rt2x00usb_flush_queue(struct data_queue *queue, bool drop);
 388
 389 /**
 390  * rt2x00usb_watchdog - Watchdog for USB communication
 391  * @rt2x00dev: Pointer to &struct rt2x00_dev
 392  *
 393  * Check the health of the USB communication and determine
 394  * if timeouts have occurred. If this is the case, this function
 395  * will reset all communication to restore functionality again.
 396  */
 397 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev);
 398
 399 /*
 400  * Device initialization handlers.
 401  */
 402 void rt2x00usb_clear_entry(struct queue_entry *entry);
 403 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev);
 404 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev);
 405
 406 /*
 407  * USB driver handlers.
 408  */
 409 int rt2x00usb_probe(struct usb_interface *usb_intf,
 410                     const struct rt2x00_ops *ops);
 411 void rt2x00usb_disconnect(struct usb_interface *usb_intf);
 412 #ifdef CONFIG_PM
 413 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state);
 414 int rt2x00usb_resume(struct usb_interface *usb_intf);
 415 #else
 416 #define rt2x00usb_suspend       NULL
 417 #define rt2x00usb_resume        NULL
 418 #endif /* CONFIG_PM */
 419
 420 #endif /* RT2X00USB_H */