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 - Set the internal rfkill hardware block state
 142  * @rfkill: pointer to the rfkill class to modify.
 143  * @blocked: the current hardware block state to set
 144  *
 145  * rfkill drivers that get events when the hard-blocked state changes
 146  * use this function to notify the rfkill core (and through that also
 147  * userspace) of the current state.  They should also use this after
 148  * resume if the state could have changed.
 149  *
 150  * You need not (but may) call this function if poll_state is assigned.
 151  *
 152  * This function can be called in any context, even from within rfkill
 153  * callbacks.
 154  *
 155  * The function returns the combined block state (true if transmitter
 156  * should be blocked) so that drivers need not keep track of the soft
 157  * block state -- which they might not be able to.
 158  */
 159 bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked);
 160
 161 /**
 162  * rfkill_set_sw_state - Set the internal rfkill software block state
 163  * @rfkill: pointer to the rfkill class to modify.
 164  * @blocked: the current software block state to set
 165  *
 166  * rfkill drivers that get events when the soft-blocked state changes
 167  * (yes, some platforms directly act on input but allow changing again)
 168  * use this function to notify the rfkill core (and through that also
 169  * userspace) of the current state.
 170  *
 171  * Drivers should also call this function after resume if the state has
 172  * been changed by the user.  This only makes sense for "persistent"
 173  * devices (see rfkill_init_sw_state()).
 174  *
 175  * This function can be called in any context, even from within rfkill
 176  * callbacks.
 177  *
 178  * The function returns the combined block state (true if transmitter
 179  * should be blocked).
 180  */
 181 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked);
 182
 183 /**
 184  * rfkill_init_sw_state - Initialize persistent software block state
 185  * @rfkill: pointer to the rfkill class to modify.
 186  * @blocked: the current software block state to set
 187  *
 188  * rfkill drivers that preserve their software block state over power off
 189  * use this function to notify the rfkill core (and through that also
 190  * userspace) of their initial state.  It should only be used before
 191  * registration.
 192  *
 193  * In addition, it marks the device as "persistent", an attribute which
 194  * can be read by userspace.  Persistent devices are expected to preserve
 195  * their own state when suspended.
 196  */
 197 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked);
 198
 199 /**
 200  * rfkill_set_states - Set the internal rfkill block states
 201  * @rfkill: pointer to the rfkill class to modify.
 202  * @sw: the current software block state to set
 203  * @hw: the current hardware block state to set
 204  *
 205  * This function can be called in any context, even from within rfkill
 206  * callbacks.
 207  */
 208 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw);
 209
 210 /**
 211  * rfkill_blocked - Query rfkill block state
 212  *
 213  * @rfkill: rfkill struct to query
 214  */
 215 bool rfkill_blocked(struct rfkill *rfkill);
 216
 217 /**
 218  * rfkill_find_type - Helper for finding rfkill type by name
 219  * @name: the name of the type
 220  *
 221  * Returns enum rfkill_type that corresponds to the name.
 222  */
 223 enum rfkill_type rfkill_find_type(const char *name);
 224
 225 #else /* !RFKILL */
 226 static inline struct rfkill * __must_check
 227 rfkill_alloc(const char *name,
 228              struct device *parent,
 229              const enum rfkill_type type,
 230              const struct rfkill_ops *ops,
 231              void *ops_data)
 232 {
 233         return ERR_PTR(-ENODEV);
 234 }
 235
 236 static inline int __must_check rfkill_register(struct rfkill *rfkill)
 237 {
 238         if (rfkill == ERR_PTR(-ENODEV))
 239                 return 0;
 240         return -EINVAL;
 241 }
 242
 243 static inline void rfkill_pause_polling(struct rfkill *rfkill)
 244 {
 245 }
 246
 247 static inline void rfkill_resume_polling(struct rfkill *rfkill)
 248 {
 249 }
 250
 251 static inline void rfkill_unregister(struct rfkill *rfkill)
 252 {
 253 }
 254
 255 static inline void rfkill_destroy(struct rfkill *rfkill)
 256 {
 257 }
 258
 259 static inline bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
 260 {
 261         return blocked;
 262 }
 263
 264 static inline bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 265 {
 266         return blocked;
 267 }
 268
 269 static inline void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
 270 {
 271 }
 272
 273 static inline void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
 274 {
 275 }
 276
 277 static inline bool rfkill_blocked(struct rfkill *rfkill)
 278 {
 279         return false;
 280 }
 281
 282 static inline enum rfkill_type rfkill_find_type(const char *name)
 283 {
 284         return RFKILL_TYPE_ALL;
 285 }
 286
 287 #endif /* RFKILL || RFKILL_MODULE */
 288
 289
 290 #ifdef CONFIG_RFKILL_LEDS
 291 /**
 292  * rfkill_get_led_trigger_name - Get the LED trigger name for the button's LED.
 293  * This function might return a NULL pointer if registering of the
 294  * LED trigger failed. Use this as "default_trigger" for the LED.
 295  */
 296 const char *rfkill_get_led_trigger_name(struct rfkill *rfkill);
 297
 298 /**
 299  * rfkill_set_led_trigger_name - Set the LED trigger name
 300  * @rfkill: rfkill struct
 301  * @name: LED trigger name
 302  *
 303  * This function sets the LED trigger name of the radio LED
 304  * trigger that rfkill creates. It is optional, but if called
 305  * must be called before rfkill_register() to be effective.
 306  */
 307 void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name);
 308 #else
 309 static inline const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
 310 {
 311         return NULL;
 312 }
 313
 314 static inline void
 315 rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
 316 {
 317 }
 318 #endif
 319
 320 #endif /* RFKILL_H */