include/linux/rfkill.h

   1 #ifndef __RFKILL_H
   2 #define __RFKILL_H
   3
   4 /*
   5  * Copyright (C) 2006 - 2007 Ivo van Doorn
   6  * Copyright (C) 2007 Dmitry Torokhov
   7  * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the
  21  * Free Software Foundation, Inc.,
  22  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  */
  24
  25 #include <linux/types.h>
  26
  27 /* define userspace visible states */
  28 #define RFKILL_STATE_SOFT_BLOCKED       0
  29 #define RFKILL_STATE_UNBLOCKED          1
  30 #define RFKILL_STATE_HARD_BLOCKED       2
  31
  32 /**
  33  * enum rfkill_type - type of rfkill switch.
  34  *
  35  * @RFKILL_TYPE_ALL: toggles all switches (userspace only)
  36  * @RFKILL_TYPE_WLAN: switch is on a 802.11 wireless network device.
  37  * @RFKILL_TYPE_BLUETOOTH: switch is on a bluetooth device.
  38  * @RFKILL_TYPE_UWB: switch is on a ultra wideband device.
  39  * @RFKILL_TYPE_WIMAX: switch is on a WiMAX device.
  40  * @RFKILL_TYPE_WWAN: switch is on a wireless WAN device.
  41  * @NUM_RFKILL_TYPES: number of defined rfkill types
  42  */
  43 enum rfkill_type {
  44         RFKILL_TYPE_ALL = 0,
  45         RFKILL_TYPE_WLAN,
  46         RFKILL_TYPE_BLUETOOTH,
  47         RFKILL_TYPE_UWB,
  48         RFKILL_TYPE_WIMAX,
  49         RFKILL_TYPE_WWAN,
  50         NUM_RFKILL_TYPES,
  51 };
  52
  53 /**
  54  * enum rfkill_operation - operation types
  55  * @RFKILL_OP_ADD: a device was added
  56  * @RFKILL_OP_DEL: a device was removed
  57  * @RFKILL_OP_CHANGE: a device's state changed -- userspace changes one device
  58  * @RFKILL_OP_CHANGE_ALL: userspace changes all devices (of a type, or all)
  59  */
  60 enum rfkill_operation {
  61         RFKILL_OP_ADD = 0,
  62         RFKILL_OP_DEL,
  63         RFKILL_OP_CHANGE,
  64         RFKILL_OP_CHANGE_ALL,
  65 };
  66
  67 /**
  68  * struct rfkill_event - events for userspace on /dev/rfkill
  69  * @idx: index of dev rfkill
  70  * @type: type of the rfkill struct
  71  * @op: operation code
  72  * @hard: hard state (0/1)
  73  * @soft: soft state (0/1)
  74  *
  75  * Structure used for userspace communication on /dev/rfkill,
  76  * used for events from the kernel and control to the kernel.
  77  */
  78 struct rfkill_event {
  79         __u32 idx;
  80         __u8  type;
  81         __u8  op;
  82         __u8  soft, hard;
  83 } __packed;
  84
  85 /* ioctl for turning off rfkill-input (if present) */
  86 #define RFKILL_IOC_MAGIC        'R'
  87 #define RFKILL_IOC_NOINPUT      1
  88 #define RFKILL_IOCTL_NOINPUT    _IO(RFKILL_IOC_MAGIC, RFKILL_IOC_NOINPUT)
  89
  90 /* and that's all userspace gets */
  91 #ifdef __KERNEL__
  92 /* don't allow anyone to use these in the kernel */
  93 enum rfkill_user_states {
  94         RFKILL_USER_STATE_SOFT_BLOCKED  = RFKILL_STATE_SOFT_BLOCKED,
  95         RFKILL_USER_STATE_UNBLOCKED     = RFKILL_STATE_UNBLOCKED,
  96         RFKILL_USER_STATE_HARD_BLOCKED  = RFKILL_STATE_HARD_BLOCKED,
  97 };
  98 #undef RFKILL_STATE_SOFT_BLOCKED
  99 #undef RFKILL_STATE_UNBLOCKED
 100 #undef RFKILL_STATE_HARD_BLOCKED
 101
 102 #include <linux/kernel.h>
 103 #include <linux/list.h>
 104 #include <linux/mutex.h>
 105 #include <linux/device.h>
 106 #include <linux/leds.h>
 107 #include <linux/err.h>
 108
 109 /* this is opaque */
 110 struct rfkill;
 111
 112 /**
 113  * struct rfkill_ops - rfkill driver methods
 114  *
 115  * @poll: poll the rfkill block state(s) -- only assign this method
 116  *      when you need polling. When called, simply call one of the
 117  *      rfkill_set{,_hw,_sw}_state family of functions. If the hw
 118  *      is getting unblocked you need to take into account the return
 119  *      value of those functions to make sure the software block is
 120  *      properly used.
 121  * @query: query the rfkill block state(s) and call exactly one of the
 122  *      rfkill_set{,_hw,_sw}_state family of functions. Assign this
 123  *      method if input events can cause hardware state changes to make
 124  *      the rfkill core query your driver before setting a requested
 125  *      block.
 126  * @set_block: turn the transmitter on (blocked == false) or off
 127  *      (blocked == true) -- ignore and return 0 when hard blocked.
 128  *      This callback must be assigned.
 129  */
 130 struct rfkill_ops {
 131         void    (*poll)(struct rfkill *rfkill, void *data);
 132         void    (*query)(struct rfkill *rfkill, void *data);
 133         int     (*set_block)(void *data, bool blocked);
 134 };
 135
 136 #if defined(CONFIG_RFKILL) || defined(CONFIG_RFKILL_MODULE)
 137 /**
 138  * rfkill_alloc - allocate rfkill structure
 139  * @name: name of the struct -- the string is not copied internally
 140  * @parent: device that has rf switch on it
 141  * @type: type of the switch (RFKILL_TYPE_*)
 142  * @ops: rfkill methods
 143  * @ops_data: data passed to each method
 144  *
 145  * This function should be called by the transmitter driver to allocate an
 146  * rfkill structure. Returns %NULL on failure.
 147  */
 148 struct rfkill * __must_check rfkill_alloc(const char *name,
 149                                           struct device *parent,
 150                                           const enum rfkill_type type,
 151                                           const struct rfkill_ops *ops,
 152                                           void *ops_data);
 153
 154 /**
 155  * rfkill_register - Register a rfkill structure.
 156  * @rfkill: rfkill structure to be registered
 157  *
 158  * This function should be called by the transmitter driver to register
 159  * the rfkill structure. Before calling this function the driver needs
 160  * to be ready to service method calls from rfkill.
 161  *
 162  * If rfkill_init_sw_state() is not called before registration,
 163  * set_block() will be called to initialize the software blocked state
 164  * to a default value.
 165  *
 166  * If the hardware blocked state is not set before registration,
 167  * it is assumed to be unblocked.
 168  */
 169 int __must_check rfkill_register(struct rfkill *rfkill);
 170
 171 /**
 172  * rfkill_pause_polling(struct rfkill *rfkill)
 173  *
 174  * Pause polling -- say transmitter is off for other reasons.
 175  * NOTE: not necessary for suspend/resume -- in that case the
 176  * core stops polling anyway
 177  */
 178 void rfkill_pause_polling(struct rfkill *rfkill);
 179
 180 /**
 181  * rfkill_resume_polling(struct rfkill *rfkill)
 182  *
 183  * Pause polling -- say transmitter is off for other reasons.
 184  * NOTE: not necessary for suspend/resume -- in that case the
 185  * core stops polling anyway
 186  */
 187 void rfkill_resume_polling(struct rfkill *rfkill);
 188
 189
 190 /**
 191  * rfkill_unregister - Unregister a rfkill structure.
 192  * @rfkill: rfkill structure to be unregistered
 193  *
 194  * This function should be called by the network driver during device
 195  * teardown to destroy rfkill structure. Until it returns, the driver
 196  * needs to be able to service method calls.
 197  */
 198 void rfkill_unregister(struct rfkill *rfkill);
 199
 200 /**
 201  * rfkill_destroy - free rfkill structure
 202  * @rfkill: rfkill structure to be destroyed
 203  *
 204  * Destroys the rfkill structure.
 205  */
 206 void rfkill_destroy(struct rfkill *rfkill);
 207
 208 /**
 209  * rfkill_set_hw_state - Set the internal rfkill hardware block state
 210  * @rfkill: pointer to the rfkill class to modify.
 211  * @state: the current hardware block state to set
 212  *
 213  * rfkill drivers that get events when the hard-blocked state changes
 214  * use this function to notify the rfkill core (and through that also
 215  * userspace) of the current state.  They should also use this after
 216  * resume if the state could have changed.
 217  *
 218  * You need not (but may) call this function if poll_state is assigned.
 219  *
 220  * This function can be called in any context, even from within rfkill
 221  * callbacks.
 222  *
 223  * The function returns the combined block state (true if transmitter
 224  * should be blocked) so that drivers need not keep track of the soft
 225  * block state -- which they might not be able to.
 226  */
 227 bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked);
 228
 229 /**
 230  * rfkill_set_sw_state - Set the internal rfkill software block state
 231  * @rfkill: pointer to the rfkill class to modify.
 232  * @state: the current software block state to set
 233  *
 234  * rfkill drivers that get events when the soft-blocked state changes
 235  * (yes, some platforms directly act on input but allow changing again)
 236  * use this function to notify the rfkill core (and through that also
 237  * userspace) of the current state.
 238  *
 239  * Drivers should also call this function after resume if the state has
 240  * been changed by the user.  This only makes sense for "persistent"
 241  * devices (see rfkill_init_sw_state()).
 242  *
 243  * This function can be called in any context, even from within rfkill
 244  * callbacks.
 245  *
 246  * The function returns the combined block state (true if transmitter
 247  * should be blocked).
 248  */
 249 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked);
 250
 251 /**
 252  * rfkill_init_sw_state - Initialize persistent software block state
 253  * @rfkill: pointer to the rfkill class to modify.
 254  * @state: the current software block state to set
 255  *
 256  * rfkill drivers that preserve their software block state over power off
 257  * use this function to notify the rfkill core (and through that also
 258  * userspace) of their initial state.  It should only be used before
 259  * registration.
 260  *
 261  * In addition, it marks the device as "persistent", an attribute which
 262  * can be read by userspace.  Persistent devices are expected to preserve
 263  * their own state when suspended.
 264  */
 265 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked);
 266
 267 /**
 268  * rfkill_set_states - Set the internal rfkill block states
 269  * @rfkill: pointer to the rfkill class to modify.
 270  * @sw: the current software block state to set
 271  * @hw: the current hardware block state to set
 272  *
 273  * This function can be called in any context, even from within rfkill
 274  * callbacks.
 275  */
 276 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw);
 277
 278 /**
 279  * rfkill_blocked - query rfkill block
 280  *
 281  * @rfkill: rfkill struct to query
 282  */
 283 bool rfkill_blocked(struct rfkill *rfkill);
 284 #else /* !RFKILL */
 285 static inline struct rfkill * __must_check
 286 rfkill_alloc(const char *name,
 287              struct device *parent,
 288              const enum rfkill_type type,
 289              const struct rfkill_ops *ops,
 290              void *ops_data)
 291 {
 292         return ERR_PTR(-ENODEV);
 293 }
 294
 295 static inline int __must_check rfkill_register(struct rfkill *rfkill)
 296 {
 297         if (rfkill == ERR_PTR(-ENODEV))
 298                 return 0;
 299         return -EINVAL;
 300 }
 301
 302 static inline void rfkill_pause_polling(struct rfkill *rfkill)
 303 {
 304 }
 305
 306 static inline void rfkill_resume_polling(struct rfkill *rfkill)
 307 {
 308 }
 309
 310 static inline void rfkill_unregister(struct rfkill *rfkill)
 311 {
 312 }
 313
 314 static inline void rfkill_destroy(struct rfkill *rfkill)
 315 {
 316 }
 317
 318 static inline bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
 319 {
 320         return blocked;
 321 }
 322
 323 static inline bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 324 {
 325         return blocked;
 326 }
 327
 328 static inline void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
 329 {
 330 }
 331
 332 static inline void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
 333 {
 334 }
 335
 336 static inline bool rfkill_blocked(struct rfkill *rfkill)
 337 {
 338         return false;
 339 }
 340 #endif /* RFKILL || RFKILL_MODULE */
 341
 342
 343 #ifdef CONFIG_RFKILL_LEDS
 344 /**
 345  * rfkill_get_led_trigger_name - Get the LED trigger name for the button's LED.
 346  * This function might return a NULL pointer if registering of the
 347  * LED trigger failed. Use this as "default_trigger" for the LED.
 348  */
 349 const char *rfkill_get_led_trigger_name(struct rfkill *rfkill);
 350
 351 /**
 352  * rfkill_set_led_trigger_name -- set the LED trigger name
 353  * @rfkill: rfkill struct
 354  * @name: LED trigger name
 355  *
 356  * This function sets the LED trigger name of the radio LED
 357  * trigger that rfkill creates. It is optional, but if called
 358  * must be called before rfkill_register() to be effective.
 359  */
 360 void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name);
 361 #else
 362 static inline const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
 363 {
 364         return NULL;
 365 }
 366
 367 static inline void
 368 rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
 369 {
 370 }
 371 #endif
 372
 373 #endif /* __KERNEL__ */
 374
 375 #endif /* RFKILL_H */