rfkill: rewrite

[linux-2.6-block.git] / include / linux / rfkill.h

#ifndef __RFKILL_H
#define __RFKILL_H

/*
 * Copyright (C) 2006 - 2007 Ivo van Doorn
 * Copyright (C) 2007 Dmitry Torokhov
 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the
 * Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */


/* define userspace visible states */
#define RFKILL_STATE_SOFT_BLOCKED	0
#define RFKILL_STATE_UNBLOCKED		1
#define RFKILL_STATE_HARD_BLOCKED	2

/* and that's all userspace gets */
#ifdef __KERNEL__
/* don't allow anyone to use these in the kernel */
enum rfkill_user_states {
	RFKILL_USER_STATE_SOFT_BLOCKED	= RFKILL_STATE_SOFT_BLOCKED,
	RFKILL_USER_STATE_UNBLOCKED	= RFKILL_STATE_UNBLOCKED,
	RFKILL_USER_STATE_HARD_BLOCKED	= RFKILL_STATE_HARD_BLOCKED,
};
#undef RFKILL_STATE_SOFT_BLOCKED
#undef RFKILL_STATE_UNBLOCKED
#undef RFKILL_STATE_HARD_BLOCKED

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/leds.h>

/**
 * enum rfkill_type - type of rfkill switch.
 *
 * @RFKILL_TYPE_WLAN: switch is on a 802.11 wireless network device.
 * @RFKILL_TYPE_BLUETOOTH: switch is on a bluetooth device.
 * @RFKILL_TYPE_UWB: switch is on a ultra wideband device.
 * @RFKILL_TYPE_WIMAX: switch is on a WiMAX device.
 * @RFKILL_TYPE_WWAN: switch is on a wireless WAN device.
 * @NUM_RFKILL_TYPES: number of defined rfkill types
 */
enum rfkill_type {
	RFKILL_TYPE_WLAN,
	RFKILL_TYPE_BLUETOOTH,
	RFKILL_TYPE_UWB,
	RFKILL_TYPE_WIMAX,
	RFKILL_TYPE_WWAN,
	NUM_RFKILL_TYPES,
};

/* this is opaque */
struct rfkill;

/**
 * struct rfkill_ops - rfkill driver methods
 *
 * @poll: poll the rfkill block state(s) -- only assign this method
 *	when you need polling. When called, simply call one of the
 *	rfkill_set{,_hw,_sw}_state family of functions. If the hw
 *	is getting unblocked you need to take into account the return
 *	value of those functions to make sure the software block is
 *	properly used.
 * @query: query the rfkill block state(s) and call exactly one of the
 *	rfkill_set{,_hw,_sw}_state family of functions. Assign this
 *	method if input events can cause hardware state changes to make
 *	the rfkill core query your driver before setting a requested
 *	block.
 * @set_block: turn the transmitter on (blocked == false) or off
 *	(blocked == true) -- this is called only while the transmitter
 *	is not hard-blocked, but note that the core's view of whether
 *	the transmitter is hard-blocked might differ from your driver's
 *	view due to race conditions, so it is possible that it is still
 *	called at the same time as you are calling rfkill_set_hw_state().
 *	This callback must be assigned.
 */
struct rfkill_ops {
	void	(*poll)(struct rfkill *rfkill, void *data);
	void	(*query)(struct rfkill *rfkill, void *data);
	int	(*set_block)(void *data, bool blocked);
};

#if defined(CONFIG_RFKILL) || defined(CONFIG_RFKILL_MODULE)
/**
 * rfkill_alloc - allocate rfkill structure
 * @name: name of the struct -- the string is not copied internally
 * @parent: device that has rf switch on it
 * @type: type of the switch (RFKILL_TYPE_*)
 * @ops: rfkill methods
 * @ops_data: data passed to each method
 *
 * This function should be called by the transmitter driver to allocate an
 * rfkill structure. Returns %NULL on failure.
 */
struct rfkill * __must_check rfkill_alloc(const char *name,
					  struct device *parent,
					  const enum rfkill_type type,
					  const struct rfkill_ops *ops,
					  void *ops_data);

/**
 * rfkill_register - Register a rfkill structure.
 * @rfkill: rfkill structure to be registered
 *
 * This function should be called by the transmitter driver to register
 * the rfkill structure needs to be registered. Before calling this function
 * the driver needs to be ready to service method calls from rfkill.
 */
int __must_check rfkill_register(struct rfkill *rfkill);

/**
 * rfkill_pause_polling(struct rfkill *rfkill)
 *
 * Pause polling -- say transmitter is off for other reasons.
 * NOTE: not necessary for suspend/resume -- in that case the
 * core stops polling anyway
 */
void rfkill_pause_polling(struct rfkill *rfkill);

/**
 * rfkill_resume_polling(struct rfkill *rfkill)
 *
 * Pause polling -- say transmitter is off for other reasons.
 * NOTE: not necessary for suspend/resume -- in that case the
 * core stops polling anyway
 */
void rfkill_resume_polling(struct rfkill *rfkill);


/**
 * rfkill_unregister - Unregister a rfkill structure.
 * @rfkill: rfkill structure to be unregistered
 *
 * This function should be called by the network driver during device
 * teardown to destroy rfkill structure. Until it returns, the driver
 * needs to be able to service method calls.
 */
void rfkill_unregister(struct rfkill *rfkill);

/**
 * rfkill_destroy - free rfkill structure
 * @rfkill: rfkill structure to be destroyed
 *
 * Destroys the rfkill structure.
 */
void rfkill_destroy(struct rfkill *rfkill);

/**
 * rfkill_set_hw_state - Set the internal rfkill hardware block state
 * @rfkill: pointer to the rfkill class to modify.
 * @state: the current hardware block state to set
 *
 * rfkill drivers that get events when the hard-blocked state changes
 * use this function to notify the rfkill core (and through that also
 * userspace) of the current state -- they should also use this after
 * resume if the state could have changed.
 *
 * You need not (but may) call this function if poll_state is assigned.
 *
 * This function can be called in any context, even from within rfkill
 * callbacks.
 *
 * The function returns the combined block state (true if transmitter
 * should be blocked) so that drivers need not keep track of the soft
 * block state -- which they might not be able to.
 */
bool __must_check rfkill_set_hw_state(struct rfkill *rfkill, bool blocked);

/**
 * rfkill_set_sw_state - Set the internal rfkill software block state
 * @rfkill: pointer to the rfkill class to modify.
 * @state: the current software block state to set
 *
 * rfkill drivers that get events when the soft-blocked state changes
 * (yes, some platforms directly act on input but allow changing again)
 * use this function to notify the rfkill core (and through that also
 * userspace) of the current state -- they should also use this after
 * resume if the state could have changed.
 *
 * This function can be called in any context, even from within rfkill
 * callbacks.
 *
 * The function returns the combined block state (true if transmitter
 * should be blocked).
 */
bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked);

/**
 * rfkill_set_states - Set the internal rfkill block states
 * @rfkill: pointer to the rfkill class to modify.
 * @sw: the current software block state to set
 * @hw: the current hardware block state to set
 *
 * This function can be called in any context, even from within rfkill
 * callbacks.
 */
void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw);

/**
 * rfkill_set_global_sw_state - set global sw block default
 * @type: rfkill type to set default for
 * @blocked: default to set
 *
 * This function sets the global default -- use at boot if your platform has
 * an rfkill switch. If not early enough this call may be ignored.
 *
 * XXX: instead of ignoring -- how about just updating all currently
 *	registered drivers?
 */
void rfkill_set_global_sw_state(const enum rfkill_type type, bool blocked);
#else /* !RFKILL */
static inline struct rfkill * __must_check
rfkill_alloc(const char *name,
	     struct device *parent,
	     const enum rfkill_type type,
	     const struct rfkill_ops *ops,
	     void *ops_data)
{
	return ERR_PTR(-ENODEV);
}

static inline int __must_check rfkill_register(struct rfkill *rfkill)
{
	if (rfkill == ERR_PTR(-ENODEV))
		return 0;
	return -EINVAL;
}

static inline void rfkill_pause_polling(struct rfkill *rfkill)
{
}

static inline void rfkill_resume_polling(struct rfkill *rfkill)
{
}

static inline void rfkill_unregister(struct rfkill *rfkill)
{
}

static inline void rfkill_destroy(struct rfkill *rfkill)
{
}

static inline bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
{
	return blocked;
}

static inline bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
{
	return blocked;
}

static inline void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
{
}

static inline void rfkill_set_global_sw_state(const enum rfkill_type type,
					      bool blocked)
{
}
#endif /* RFKILL || RFKILL_MODULE */


#ifdef CONFIG_RFKILL_LEDS
/**
 * rfkill_get_led_trigger_name - Get the LED trigger name for the button's LED.
 * This function might return a NULL pointer if registering of the
 * LED trigger failed. Use this as "default_trigger" for the LED.
 */
const char *rfkill_get_led_trigger_name(struct rfkill *rfkill);

/**
 * rfkill_set_led_trigger_name -- set the LED trigger name
 * @rfkill: rfkill struct
 * @name: LED trigger name
 *
 * This function sets the LED trigger name of the radio LED
 * trigger that rfkill creates. It is optional, but if called
 * must be called before rfkill_register() to be effective.
 */
void rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name);
#else
static inline const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
{
	return NULL;
}

static inline void
rfkill_set_led_trigger_name(struct rfkill *rfkill, const char *name)
{
}
#endif

#endif /* __KERNEL__ */

#endif /* RFKILL_H */