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 */