360 lines
11 KiB
C
360 lines
11 KiB
C
#ifndef __RFKILL_H
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#define __RFKILL_H
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/*
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* Copyright (C) 2006 - 2007 Ivo van Doorn
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* Copyright (C) 2007 Dmitry Torokhov
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* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <linux/types.h>
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/* define userspace visible states */
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#define RFKILL_STATE_SOFT_BLOCKED 0
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#define RFKILL_STATE_UNBLOCKED 1
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#define RFKILL_STATE_HARD_BLOCKED 2
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/**
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* enum rfkill_type - type of rfkill switch.
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*
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* @RFKILL_TYPE_ALL: toggles all switches (requests only - not a switch type)
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* @RFKILL_TYPE_WLAN: switch is on a 802.11 wireless network device.
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* @RFKILL_TYPE_BLUETOOTH: switch is on a bluetooth device.
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* @RFKILL_TYPE_UWB: switch is on a ultra wideband device.
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* @RFKILL_TYPE_WIMAX: switch is on a WiMAX device.
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* @RFKILL_TYPE_WWAN: switch is on a wireless WAN device.
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* @RFKILL_TYPE_GPS: switch is on a GPS device.
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* @RFKILL_TYPE_FM: switch is on a FM radio device.
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* @NUM_RFKILL_TYPES: number of defined rfkill types
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*/
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enum rfkill_type {
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RFKILL_TYPE_ALL = 0,
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RFKILL_TYPE_WLAN,
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RFKILL_TYPE_BLUETOOTH,
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RFKILL_TYPE_UWB,
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RFKILL_TYPE_WIMAX,
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RFKILL_TYPE_WWAN,
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RFKILL_TYPE_GPS,
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RFKILL_TYPE_FM,
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NUM_RFKILL_TYPES,
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};
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/**
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* enum rfkill_operation - operation types
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* @RFKILL_OP_ADD: a device was added
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* @RFKILL_OP_DEL: a device was removed
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* @RFKILL_OP_CHANGE: a device's state changed -- userspace changes one device
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* @RFKILL_OP_CHANGE_ALL: userspace changes all devices (of a type, or all)
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*/
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enum rfkill_operation {
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RFKILL_OP_ADD = 0,
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RFKILL_OP_DEL,
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RFKILL_OP_CHANGE,
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RFKILL_OP_CHANGE_ALL,
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};
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/**
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* struct rfkill_event - events for userspace on /dev/rfkill
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* @idx: index of dev rfkill
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* @type: type of the rfkill struct
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* @op: operation code
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* @hard: hard state (0/1)
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* @soft: soft state (0/1)
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*
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* Structure used for userspace communication on /dev/rfkill,
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* used for events from the kernel and control to the kernel.
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*/
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struct rfkill_event {
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__u32 idx;
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__u8 type;
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__u8 op;
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__u8 soft, hard;
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} __attribute__((packed));
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/*
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* We are planning to be backward and forward compatible with changes
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* to the event struct, by adding new, optional, members at the end.
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* When reading an event (whether the kernel from userspace or vice
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* versa) we need to accept anything that's at least as large as the
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* version 1 event size, but might be able to accept other sizes in
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* the future.
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*
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* One exception is the kernel -- we already have two event sizes in
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* that we've made the 'hard' member optional since our only option
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* is to ignore it anyway.
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*/
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#define RFKILL_EVENT_SIZE_V1 8
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/* ioctl for turning off rfkill-input (if present) */
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#define RFKILL_IOC_MAGIC 'R'
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#define RFKILL_IOC_NOINPUT 1
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#define RFKILL_IOCTL_NOINPUT _IO(RFKILL_IOC_MAGIC, RFKILL_IOC_NOINPUT)
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/* and that's all userspace gets */
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#ifdef __KERNEL__
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/* don't allow anyone to use these in the kernel */
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enum rfkill_user_states {
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RFKILL_USER_STATE_SOFT_BLOCKED = RFKILL_STATE_SOFT_BLOCKED,
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RFKILL_USER_STATE_UNBLOCKED = RFKILL_STATE_UNBLOCKED,
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RFKILL_USER_STATE_HARD_BLOCKED = RFKILL_STATE_HARD_BLOCKED,
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};
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#undef RFKILL_STATE_SOFT_BLOCKED
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#undef RFKILL_STATE_UNBLOCKED
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#undef RFKILL_STATE_HARD_BLOCKED
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/leds.h>
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#include <linux/err.h>
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/* this is opaque */
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struct rfkill;
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/**
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* struct rfkill_ops - rfkill driver methods
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*
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* @poll: poll the rfkill block state(s) -- only assign this method
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* when you need polling. When called, simply call one of the
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* rfkill_set{,_hw,_sw}_state family of functions. If the hw
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* is getting unblocked you need to take into account the return
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* value of those functions to make sure the software block is
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* properly used.
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* @query: query the rfkill block state(s) and call exactly one of the
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* rfkill_set{,_hw,_sw}_state family of functions. Assign this
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* method if input events can cause hardware state changes to make
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* the rfkill core query your driver before setting a requested
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* block.
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* @set_block: turn the transmitter on (blocked == false) or off
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* (blocked == true) -- ignore and return 0 when hard blocked.
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* This callback must be assigned.
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*/
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struct rfkill_ops {
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void (*poll)(struct rfkill *rfkill, void *data);
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void (*query)(struct rfkill *rfkill, void *data);
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int (*set_block)(void *data, bool blocked);
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};
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#if defined(CONFIG_RFKILL) || defined(CONFIG_RFKILL_MODULE)
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/**
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* rfkill_alloc - allocate rfkill structure
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* @name: name of the struct -- the string is not copied internally
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* @parent: device that has rf switch on it
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* @type: type of the switch (RFKILL_TYPE_*)
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* @ops: rfkill methods
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* @ops_data: data passed to each method
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*
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* This function should be called by the transmitter driver to allocate an
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* rfkill structure. Returns %NULL on failure.
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*/
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struct rfkill * __must_check rfkill_alloc(const char *name,
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struct device *parent,
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const enum rfkill_type type,
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const struct rfkill_ops *ops,
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void *ops_data);
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/**
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* rfkill_register - Register a rfkill structure.
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* @rfkill: rfkill structure to be registered
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*
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* This function should be called by the transmitter driver to register
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* the rfkill structure. Before calling this function the driver needs
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* to be ready to service method calls from rfkill.
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*
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* If rfkill_init_sw_state() is not called before registration,
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* set_block() will be called to initialize the software blocked state
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* to a default value.
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*
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* If the hardware blocked state is not set before registration,
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* it is assumed to be unblocked.
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*/
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int __must_check rfkill_register(struct rfkill *rfkill);
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/**
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* rfkill_pause_polling(struct rfkill *rfkill)
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*
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* Pause polling -- say transmitter is off for other reasons.
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* NOTE: not necessary for suspend/resume -- in that case the
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* core stops polling anyway
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*/
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void rfkill_pause_polling(struct rfkill *rfkill);
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/**
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* rfkill_resume_polling(struct rfkill *rfkill)
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*
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* Pause polling -- say transmitter is off for other reasons.
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* NOTE: not necessary for suspend/resume -- in that case the
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* core stops polling anyway
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*/
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void rfkill_resume_polling(struct rfkill *rfkill);
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/**
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* rfkill_unregister - Unregister a rfkill structure.
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* @rfkill: rfkill structure to be unregistered
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*
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* This function should be called by the network driver during device
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* teardown to destroy rfkill structure. Until it returns, the driver
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* needs to be able to service method calls.
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*/
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void rfkill_unregister(struct rfkill *rfkill);
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/**
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* rfkill_destroy - free rfkill structure
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* @rfkill: rfkill structure to be destroyed
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*
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* Destroys the rfkill structure.
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*/
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void rfkill_destroy(struct rfkill *rfkill);
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/**
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* rfkill_set_hw_state - Set the internal rfkill hardware block state
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* @rfkill: pointer to the rfkill class to modify.
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* @state: the current hardware block state to set
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*
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* rfkill drivers that get events when the hard-blocked state changes
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* use this function to notify the rfkill core (and through that also
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* userspace) of the current state. They should also use this after
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* resume if the state could have changed.
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*
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* You need not (but may) call this function if poll_state is assigned.
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*
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* This function can be called in any context, even from within rfkill
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* callbacks.
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*
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* The function returns the combined block state (true if transmitter
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* should be blocked) so that drivers need not keep track of the soft
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* block state -- which they might not be able to.
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*/
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bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked);
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/**
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* rfkill_set_sw_state - Set the internal rfkill software block state
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* @rfkill: pointer to the rfkill class to modify.
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* @state: the current software block state to set
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*
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* rfkill drivers that get events when the soft-blocked state changes
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* (yes, some platforms directly act on input but allow changing again)
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* use this function to notify the rfkill core (and through that also
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* userspace) of the current state.
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*
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* Drivers should also call this function after resume if the state has
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* been changed by the user. This only makes sense for "persistent"
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* devices (see rfkill_init_sw_state()).
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*
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* This function can be called in any context, even from within rfkill
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* callbacks.
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*
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* The function returns the combined block state (true if transmitter
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* should be blocked).
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*/
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bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked);
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/**
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* rfkill_init_sw_state - Initialize persistent software block state
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* @rfkill: pointer to the rfkill class to modify.
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* @state: the current software block state to set
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*
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* rfkill drivers that preserve their software block state over power off
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* use this function to notify the rfkill core (and through that also
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* userspace) of their initial state. It should only be used before
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* registration.
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*
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* In addition, it marks the device as "persistent", an attribute which
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* can be read by userspace. Persistent devices are expected to preserve
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* their own state when suspended.
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*/
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void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked);
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/**
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* rfkill_set_states - Set the internal rfkill block states
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* @rfkill: pointer to the rfkill class to modify.
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* @sw: the current software block state to set
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* @hw: the current hardware block state to set
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*
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* This function can be called in any context, even from within rfkill
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* callbacks.
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*/
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void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw);
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/**
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* rfkill_blocked - query rfkill block
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*
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* @rfkill: rfkill struct to query
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*/
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bool rfkill_blocked(struct rfkill *rfkill);
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#else /* !RFKILL */
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static inline struct rfkill * __must_check
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rfkill_alloc(const char *name,
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struct device *parent,
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const enum rfkill_type type,
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const struct rfkill_ops *ops,
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void *ops_data)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline int __must_check rfkill_register(struct rfkill *rfkill)
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{
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if (rfkill == ERR_PTR(-ENODEV))
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return 0;
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return -EINVAL;
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}
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static inline void rfkill_pause_polling(struct rfkill *rfkill)
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{
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}
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static inline void rfkill_resume_polling(struct rfkill *rfkill)
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{
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}
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static inline void rfkill_unregister(struct rfkill *rfkill)
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{
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}
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static inline void rfkill_destroy(struct rfkill *rfkill)
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{
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}
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static inline bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
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{
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return blocked;
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}
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static inline bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
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{
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return blocked;
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}
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static inline void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked)
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{
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}
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static inline void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
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{
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}
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static inline bool rfkill_blocked(struct rfkill *rfkill)
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{
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return false;
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}
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#endif /* RFKILL || RFKILL_MODULE */
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#endif /* __KERNEL__ */
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#endif /* RFKILL_H */
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