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
 108  */
 109 void rfkill_pause_polling(struct rfkill *rfkill);
 110
 111 /**
 112  * rfkill_resume_polling(struct rfkill *rfkill)
 113  *
 114  * Pause polling -- say transmitter is off for other reasons.
 115  * NOTE: not necessary for suspend/resume -- in that case the
 116  * core stops polling anyway
 117  */
 118 void rfkill_resume_polling(struct rfkill *rfkill);
 119
 120
 121 /**
 122  * rfkill_unregister - Unregister a rfkill structure.
 123  * @rfkill: rfkill structure to be unregistered
 124  *
 125  * This function should be called by the network driver during device
 126  * teardown to destroy rfkill structure. Until it returns, the driver
 127  * needs to be able to service method calls.
 128  */
 129 void rfkill_unregister(struct rfkill *rfkill);
 130
 131 /**
 132  * rfkill_destroy - free rfkill structure
 133  * @rfkill: rfkill structure to be destroyed
 134  *
 135  * Destroys the rfkill structure.
 136  */
 137 void rfkill_destroy(struct rfkill *rfkill);
 138
 139 /**
 140  * rfkill_set_hw_state - Set the internal rfkill hardware block state
 141  * @rfkill: pointer to the rfkill class to modify.
 142  * @state: the current hardware block state to set
 143  *
 144  * rfkill drivers that get events when the hard-blocked state changes
 145  * use this function to notify the rfkill core (and through that also
 146  * userspace) of the current state.  They should also use this after
 147  * resume if the state could have changed.
 148  *
 149  * You need not (but may) call this function if poll_state is assigned.
 150  *
 151  * This function can be called in any context, even from within rfkill
 152  * callbacks.
 153  *
 154  * The function returns the combined block state (true if transmitter
 155  * should be blocked) so that drivers need not keep track of the soft
 156  * block state -- which they might not be able to.
 157  */
 158 bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked);
 159
 160 /**
 161  * rfkill_set_sw_state - Set the internal rfkill software block state
 162  * @rfkill: pointer to the rfkill class to modify.
 163  * @state: the current software block state to set
 164  *
 165  * rfkill drivers that get events when the soft-blocked state changes
 166  * (yes, some platforms directly act on input but allow changing again)
 167  * use this function to notify the rfkill core (and through that also
 168  * userspace) of the current state.
 169  *
 170  * Drivers should also call this function after resume if the state has
 171  * been changed by the user.  This only makes sense for "persistent"
 172  * devices (see rfkill_init_sw_state()).
 173  *
 174  * This function can be called in any context, even from within rfkill
 175  * callbacks.
 176  *
 177  * The function returns the combined block state (true if transmitter
 178  * should be blocked).
 179  */
 180 bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked);
 181
 182 /**
 183  * rfkill_init_sw_state - Initialize persistent software block state
 184  * @rfkill: pointer to the rfkill class to modify.
 185  * @state: the current software block state to set
 186  *
 187  * rfkill drivers that preserve their software block state over power off
 188  * use this function to notify the rfkill core (and through that also
 189  * userspace) of their initial state.  It should only be used before
 190  * registration.
 191  *
 192  * In addition, it marks the device as "persistent", an attribute which
 193  * can be read by userspace.  Persistent devices are expected to preserve
 194  * their own state when suspended.
 195  */
 196 void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked);
 197
 198 /**
 199  * rfkill_set_states - Set the internal rfkill block states
 200  * @rfkill: pointer to the rfkill class to modify.
 201  * @sw: the current software block state to set
 202  * @hw: the current hardware block state to set
 203  *
 204  * This function can be called in any context, even from within rfkill
 205  * callbacks.
 206  */
 207 void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw);
 208
 209 /**
 210  * rfkill_blocked - query rfkill block
 211  *
 212  * @rfkill: rfkill struct to query
 213  */
 214 bool rfkill_blocked(struct rfkill *rfkill);
 215 #else /* !RFKILL */
 216 static inline struct rfkill * __must_check
 217 rfkill_alloc(const char *name,
 218              struct device *parent,
 219              const enum rfkill_type type,
 220              const struct rfkill_ops *ops,
 221              void *ops_data)
 222 {
 223         return ERR_PTR(-ENODEV);
 224 }
 225
 226 static inline int __must_check rfkill_register(struct rfkill *rfkill)
 227 {
 228         if (rfkill == ERR_PTR(-ENODEV))
 229                 return 0;
 230         return -EINVAL;
 231 }
 232
 233 static inline void rfkill_pause_polling(struct rfkill *rfkill)
 234 {
 235 }
 236
 237 static inline void rfkill_resume_polling(struct rfkill *rfkill)
 238 {
 239 }
 240
 241 static inline void rfkill_unregister(struct rfkill *rfkill)
 242 {
 243 }
 244
 245 static inline void rfkill_destroy(struct rfkill *rfkill)
 246 {
 247 }
 248
 249 static inline bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
 250 {
 251         return blocked;
 252 }
 253
 254 static inline bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
 255 {
 256         return blocked;
 257 }
 258
 259 static inline void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
 260 {
 261 }
 262
 263 static inline void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
 264 {
 265 }
 266
 267 static inline bool rfkill_blocked(struct rfkill *rfkill)
 268 {
 269         return false;
 270 }
 271 #endif /* RFKILL || RFKILL_MODULE */
 272
 273
 274 #ifdef CONFIG_RFKILL_LEDS
 275 /**
 276  * rfkill_get_led_trigger_name - Get the LED trigger name for the button's LED.
 277  * This function might return a NULL pointer if registering of the
 278  * LED trigger failed. Use this as "default_trigger" for the LED.
 279  */
 280 const char *rfkill_get_led_trigger_name(struct rfkill *rfkill);
 281
 282 /**
 283  * rfkill_set_led_trigger_name -- set the LED trigger name
 284  * @rfkill: rfkill struct
 285  * @name: LED trigger name
 286  *
 287  * This function sets the LED trigger name of the radio LED
 288  * trigger that rfkill creates. It is optional, but if called
 289  * must be called before rfkill_register() to be effective.
 290  */
 291 void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name);
 292 #else
 293 static inline const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
 294 {
 295         return NULL;
 296 }
 297
 298 static inline void
 299 rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
 300 {
 301 }
 302 #endif
 303
 304 #endif /* RFKILL_H */