include/linux/rfkill.h

   1 /*
   2  * Copyright (C) 2006 - 2007 Ivo van Doorn
   3  * Copyright (C) 2007 Dmitry Torokhov
   4  * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 #ifndef __RFKILL_H
  19 #define __RFKILL_H
  20
  21 #include <uapi/linux/rfkill.h>
  22
  23 /* don't allow anyone to use these in the kernel */
  24 enum rfkill_user_states {
  25         RFKILL_USER_STATE_SOFT_BLOCKED  = RFKILL_STATE_SOFT_BLOCKED,
  26         RFKILL_USER_STATE_UNBLOCKED     = RFKILL_STATE_UNBLOCKED,
  27         RFKILL_USER_STATE_HARD_BLOCKED  = RFKILL_STATE_HARD_BLOCKED,
  28 };
  29 #undef RFKILL_STATE_SOFT_BLOCKED
  30 #undef RFKILL_STATE_UNBLOCKED
  31 #undef RFKILL_STATE_HARD_BLOCKED
  32
  33 #include <linux/kernel.h>
  34 #include <linux/list.h>
  35 #include <linux/mutex.h>
  36 #include <linux/leds.h>
  37 #include <linux/err.h>
  38
  39 struct device;
  40 /* this is opaque */
  41 struct rfkill;
  42
  43 /**
  44  * struct rfkill_ops - rfkill driver methods
  45  *
  46  * @poll: poll the rfkill block state(s) -- only assign this method
  47  *      when you need polling. When called, simply call one of the
  48  *      rfkill_set{,_hw,_sw}_state family of functions. If the hw
  49  *      is getting unblocked you need to take into account the return
  50  *      value of those functions to make sure the software block is
  51  *      properly used.
  52  * @query: query the rfkill block state(s) and call exactly one of the
  53  *      rfkill_set{,_hw,_sw}_state family of functions. Assign this
  54  *      method if input events can cause hardware state changes to make
  55  *      the rfkill core query your driver before setting a requested
  56  *      block.
  57  * @set_block: turn the transmitter on (blocked == false) or off
  58  *      (blocked == true) -- ignore and return 0 when hard blocked.
  59  *      This callback must be assigned.
  60  */
  61 struct rfkill_ops {
  62         void    (*poll)(struct rfkill *rfkill, void *data);
  63         void    (*query)(struct rfkill *rfkill, void *data);
  64         int     (*set_block)(void *data, bool blocked);
  65 };
  66
  67 #if defined(CONFIG_RFKILL) || defined(CONFIG_RFKILL_MODULE)
  68 /**
  69  * rfkill_alloc - Allocate rfkill structure
  70  * @name: name of the struct -- the string is not copied internally
  71  * @parent: device that has rf switch on it
  72  * @type: type of the switch (RFKILL_TYPE_*)
  73  * @ops: rfkill methods
  74  * @ops_data: data passed to each method
  75  *
  76  * This function should be called by the transmitter driver to allocate an
  77  * rfkill structure. Returns %NULL on failure.
  78  */
  79 struct rfkill * __must_check rfkill_alloc(const char *name,
  80                                           struct device *parent,
  81                                           const enum rfkill_type type,
  82                                           const struct rfkill_ops *ops,
  83                                           void *ops_data);
  84
  85 /**
  86  * rfkill_register - Register a rfkill structure.
  87  * @rfkill: rfkill structure to be registered
  88  *
  89  * This function should be called by the transmitter driver to register
  90  * the rfkill structure. Before calling this function the driver needs
  91  * to be ready to service method calls from rfkill.
  92  *
  93  * If rfkill_init_sw_state() is not called before registration,
  94  * set_block() will be called to initialize the software blocked state
  95  * to a default value.
  96  *
  97  * If the hardware blocked state is not set before registration,
  98  * it is assumed to be unblocked.
  99  */
 100 int __must_check rfkill_register(struct rfkill *rfkill);
 101
 102 /**
 103  * rfkill_pause_polling(struct rfkill *rfkill)
 104  *
 105  * Pause polling -- say transmitter is off for other reasons.
 106  * NOTE: not necessary for suspend/resume -- in that case the
 107  * core stops polling anyway (but will also correctly handle
 108  * the case of polling having been paused before suspend.)
 109  */
 110 void rfkill_pause_polling(struct rfkill *rfkill);
 111
 112 /**
 113  * rfkill_resume_polling(struct rfkill *rfkill)
 114  *
 115  * Resume polling
 116  * NOTE: not necessary for suspend/resume -- in that case the
 117  * core stops polling anyway
 118  */
 119 void rfkill_resume_polling(struct rfkill *rfkill);
 120
 121
 122 /**
 123  * rfkill_unregister - Unregister a rfkill structure.
 124  * @rfkill: rfkill structure to be unregistered
 125  *
 126  * This function should be called by the network driver during device
 127  * teardown to destroy rfkill structure. Until it returns, the driver
 128  * needs to be able to service method calls.
 129  */
 130 void rfkill_unregister(struct rfkill *rfkill);
 131
 132 /**
 133  * rfkill_destroy - Free rfkill structure
 134  * @rfkill: rfkill structure to be destroyed
 135  *
 136  * Destroys the rfkill structure.
 137  */
 138 void rfkill_destroy(struct rfkill *rfkill);
 139
 140 /**
 141  * rfkill_set_hw_state_reason - Set the internal rfkill hardware block state
 142  *      with a reason
 143  * @rfkill: pointer to the rfkill class to modify.
 144  * @blocked: the current hardware block state to set
 145  * @reason: one of &enum rfkill_hard_block_reasons
 146  *
 147  * Prefer to use rfkill_set_hw_state if you don't need any special reason.
 148  */
 149 bool rfkill_set_hw_state_reason(struct rfkill *rfkill,
 150                                 bool blocked, unsigned long reason);
 151 /**
 152  * rfkill_set_hw_state - Set the internal rfkill hardware block state
 153  * @rfkill: pointer to the rfkill class to modify.
 154  * @blocked: the current hardware block state to set
 155  *
 156  * rfkill drivers that get events when the hard-blocked state changes
 157  * use this function to notify the rfkill core (and through that also
 158  * userspace) of the current state.  They should also use this after
 159  * resume if the state could have changed.
 160  *
 161  * You need not (but may) call this function if poll_state is assigned.
 162  *
 163  * This function can be called in any context, even from within rfkill
 164  * callbacks.
 165  *
 166  * The function returns the combined block state (true if transmitter
 167  * should be blocked) so that drivers need not keep track of the soft
 168  * block state -- which they might not be able to.
 169  */
 170 static inline bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
 171 {
 172         return rfkill_set_hw_state_reason(rfkill, blocked,
 173                                           RFKILL_HARD_BLOCK_SIGNAL);
 174 }
 175
 176 /**
 177  * rfkill_set_sw_state - Set the internal rfkill software block state
 178  * @rfkill: pointer to the rfkill class to modify.
 179  * @blocked: the current software block state to set
 180  *
 181  * rfkill drivers that get events when the soft-blocked state changes
 182  * (yes, some platforms directly act on input but allow changing again)
 183  * use this function to notify the rfkill core (and through that also
 184  * userspace) of the current state.
 185  *
 186  * Drivers should also call this function after resume if the state has
 187  * been changed by the user.  This only makes sense for "persistent"
 188  * devices (see rfkill_init_sw_state()).
 189  *
 190  * This function can be called in any context, even from within rfkill
 191  * callbacks.
 192  *
 193  * The function returns the combined block state (true if transmitter
 194  * should be blocked).
 195  */
 196 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked);
 197
 198 /**
 199  * rfkill_init_sw_state - Initialize persistent software block state
 200  * @rfkill: pointer to the rfkill class to modify.
 201  * @blocked: the current software block state to set
 202  *
 203  * rfkill drivers that preserve their software block state over power off
 204  * use this function to notify the rfkill core (and through that also
 205  * userspace) of their initial state.  It should only be used before
 206  * registration.
 207  *
 208  * In addition, it marks the device as "persistent", an attribute which
 209  * can be read by userspace.  Persistent devices are expected to preserve
 210  * their own state when suspended.
 211  */
 212 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked);
 213
 214 /**
 215  * rfkill_set_states - Set the internal rfkill block states
 216  * @rfkill: pointer to the rfkill class to modify.
 217  * @sw: the current software block state to set
 218  * @hw: the current hardware block state to set
 219  *
 220  * This function can be called in any context, even from within rfkill
 221  * callbacks.
 222  */
 223 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw);
 224
 225 /**
 226  * rfkill_blocked - Query rfkill block state
 227  *
 228  * @rfkill: rfkill struct to query
 229  */
 230 bool rfkill_blocked(struct rfkill *rfkill);
 231
 232 /**
 233  * rfkill_find_type - Helper for finding rfkill type by name
 234  * @name: the name of the type
 235  *
 236  * Returns enum rfkill_type that corresponds to the name.
 237  */
 238 enum rfkill_type rfkill_find_type(const char *name);
 239
 240 #else /* !RFKILL */
 241 static inline struct rfkill * __must_check
 242 rfkill_alloc(const char *name,
 243              struct device *parent,
 244              const enum rfkill_type type,
 245              const struct rfkill_ops *ops,
 246              void *ops_data)
 247 {
 248         return ERR_PTR(-ENODEV);
 249 }
 250
 251 static inline int __must_check rfkill_register(struct rfkill *rfkill)
 252 {
 253         if (rfkill == ERR_PTR(-ENODEV))
 254                 return 0;
 255         return -EINVAL;
 256 }
 257
 258 static inline void rfkill_pause_polling(struct rfkill *rfkill)
 259 {
 260 }
 261
 262 static inline void rfkill_resume_polling(struct rfkill *rfkill)
 263 {
 264 }
 265
 266 static inline void rfkill_unregister(struct rfkill *rfkill)
 267 {
 268 }
 269
 270 static inline void rfkill_destroy(struct rfkill *rfkill)
 271 {
 272 }
 273
 274 static inline bool rfkill_set_hw_state_reason(struct rfkill *rfkill,
 275                                               bool blocked,
 276                                               unsigned long reason)
 277 {
 278         return blocked;
 279 }
 280
 281 static inline bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
 282 {
 283         return blocked;
 284 }
 285
 286 static inline bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 287 {
 288         return blocked;
 289 }
 290
 291 static inline void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
 292 {
 293 }
 294
 295 static inline void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
 296 {
 297 }
 298
 299 static inline bool rfkill_blocked(struct rfkill *rfkill)
 300 {
 301         return false;
 302 }
 303
 304 static inline enum rfkill_type rfkill_find_type(const char *name)
 305 {
 306         return RFKILL_TYPE_ALL;
 307 }
 308
 309 #endif /* RFKILL || RFKILL_MODULE */
 310
 311
 312 #ifdef CONFIG_RFKILL_LEDS
 313 /**
 314  * rfkill_get_led_trigger_name - Get the LED trigger name for the button's LED.
 315  * This function might return a NULL pointer if registering of the
 316  * LED trigger failed. Use this as "default_trigger" for the LED.
 317  */
 318 const char *rfkill_get_led_trigger_name(struct rfkill *rfkill);
 319
 320 /**
 321  * rfkill_set_led_trigger_name - Set the LED trigger name
 322  * @rfkill: rfkill struct
 323  * @name: LED trigger name
 324  *
 325  * This function sets the LED trigger name of the radio LED
 326  * trigger that rfkill creates. It is optional, but if called
 327  * must be called before rfkill_register() to be effective.
 328  */
 329 void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name);
 330 #else
 331 static inline const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
 332 {
 333         return NULL;
 334 }
 335
 336 static inline void
 337 rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
 338 {
 339 }
 340 #endif
 341
 342 #endif /* RFKILL_H */