[NET]: rfkill: add support for input key to control wireless radio
The RF kill patch that provides infrastructure for implementing switches controlling radio states on various network and other cards. [dtor@insightbb.com: address review comments] [akpm@linux-foundation.org: cleanups, build fixes] Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ivo van Doorn
David S. Miller
parent
2396a22e09
commit
cf4328cd94
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@ -0,0 +1,89 @@
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#ifndef __RFKILL_H
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#define __RFKILL_H
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/*
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* Copyright (C) 2006 Ivo van Doorn
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* Copyright (C) 2007 Dmitry Torokhov
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/types.h>
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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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/**
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* enum rfkill_type - type of rfkill switch.
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* RFKILL_TYPE_WLAN: switch is no a Wireless network devices.
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* RFKILL_TYPE_BlUETOOTH: switch is on a bluetooth device.
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* RFKILL_TYPE_IRDA: switch is on an infrared devices.
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*/
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enum rfkill_type {
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RFKILL_TYPE_WLAN = 0,
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RFKILL_TYPE_BLUETOOTH = 1,
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RFKILL_TYPE_IRDA = 2,
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RFKILL_TYPE_MAX = 3,
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};
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enum rfkill_state {
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RFKILL_STATE_OFF = 0,
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RFKILL_STATE_ON = 1,
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};
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/**
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* struct rfkill - rfkill control structure.
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* @name: Name of the switch.
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* @type: Radio type which the button controls, the value stored
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* here should be a value from enum rfkill_type.
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* @state: State of the switch (on/off).
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* @user_claim: Set when the switch is controlled exlusively by userspace.
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* @mutex: Guards switch state transitions
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* @data: Pointer to the RF button drivers private data which will be
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* passed along when toggling radio state.
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* @toggle_radio(): Mandatory handler to control state of the radio.
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* @dev: Device structure integrating the switch into device tree.
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* @node: Used to place switch into list of all switches known to the
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* the system.
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*
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* This structure represents a RF switch located on a network device.
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*/
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struct rfkill {
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char *name;
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enum rfkill_type type;
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enum rfkill_state state;
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bool user_claim;
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struct mutex mutex;
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void *data;
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int (*toggle_radio)(void *data, enum rfkill_state state);
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struct device dev;
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struct list_head node;
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};
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#define to_rfkill(d) container_of(d, struct rfkill, dev)
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struct rfkill *rfkill_allocate(struct device *parent, enum rfkill_type type);
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void rfkill_free(struct rfkill *rfkill);
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int rfkill_register(struct rfkill *rfkill);
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void rfkill_unregister(struct rfkill *rfkill);
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void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state);
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#endif /* RFKILL_H */
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@ -225,6 +225,8 @@ source "net/ieee80211/Kconfig"
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endmenu
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source "net/rfkill/Kconfig"
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endif # if NET
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endmenu # Networking
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@ -51,6 +51,7 @@ obj-$(CONFIG_IEEE80211) += ieee80211/
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obj-$(CONFIG_TIPC) += tipc/
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obj-$(CONFIG_NETLABEL) += netlabel/
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obj-$(CONFIG_IUCV) += iucv/
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obj-$(CONFIG_RFKILL) += rfkill/
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ifeq ($(CONFIG_NET),y)
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obj-$(CONFIG_SYSCTL) += sysctl_net.o
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@ -0,0 +1,24 @@
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#
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# RF switch subsystem configuration
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#
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menuconfig RFKILL
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tristate "RF switch subsystem support"
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help
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Say Y here if you want to have control over RF switches
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found on many WiFi, Bluetooth and IRDA cards.
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To compile this driver as a module, choose M here: the
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module will be called rfkill.
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config RFKILL_INPUT
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tristate "Input layer to RF switch connector"
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depends on RFKILL && INPUT
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help
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Say Y here if you want kernel automatically toggle state
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of RF switches on and off when user presses appropriate
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button or a key on the keyboard. Without this module you
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need a some kind of userspace application to control
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state of the switches.
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To compile this driver as a module, choose M here: the
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module will be called rfkill-input.
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@ -0,0 +1,6 @@
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#
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# Makefile for the RF switch subsystem.
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#
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obj-$(CONFIG_RFKILL) += rfkill.o
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obj-$(CONFIG_RFKILL_INPUT) += rfkill-input.o
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@ -0,0 +1,174 @@
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/*
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* Input layer to RF Kill interface connector
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*
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* Copyright (c) 2007 Dmitry Torokhov
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/init.h>
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#include <linux/rfkill.h>
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MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
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MODULE_DESCRIPTION("Input layer to RF switch connector");
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MODULE_LICENSE("GPL");
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struct rfkill_task {
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struct work_struct work;
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enum rfkill_type type;
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struct mutex mutex; /* ensures that task is serialized */
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spinlock_t lock; /* for accessing last and desired state */
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unsigned long last; /* last schedule */
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enum rfkill_state desired_state; /* on/off */
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enum rfkill_state current_state; /* on/off */
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};
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static void rfkill_task_handler(struct work_struct *work)
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{
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struct rfkill_task *task = container_of(work, struct rfkill_task, work);
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enum rfkill_state state;
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mutex_lock(&task->mutex);
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/*
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* Use temp variable to fetch desired state to keep it
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* consistent even if rfkill_schedule_toggle() runs in
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* another thread or interrupts us.
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*/
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state = task->desired_state;
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if (state != task->current_state) {
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rfkill_switch_all(task->type, state);
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task->current_state = state;
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}
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mutex_unlock(&task->mutex);
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}
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static void rfkill_schedule_toggle(struct rfkill_task *task)
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{
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unsigned int flags;
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spin_lock_irqsave(&task->lock, flags);
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if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
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task->desired_state = !task->desired_state;
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task->last = jiffies;
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schedule_work(&task->work);
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}
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spin_unlock_irqrestore(&task->lock, flags);
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}
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#define DEFINE_RFKILL_TASK(n, t) \
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struct rfkill_task n = { \
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.work = __WORK_INITIALIZER(n.work, \
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rfkill_task_handler), \
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.type = t, \
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.mutex = __MUTEX_INITIALIZER(n.mutex), \
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.lock = __SPIN_LOCK_UNLOCKED(n.lock), \
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.desired_state = RFKILL_STATE_ON, \
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.current_state = RFKILL_STATE_ON, \
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}
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static DEFINE_RFKILL_TASK(rfkill_wlan, RFKILL_TYPE_WLAN);
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static DEFINE_RFKILL_TASK(rfkill_bt, RFKILL_TYPE_BLUETOOTH);
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static void rfkill_event(struct input_handle *handle, unsigned int type,
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unsigned int code, int down)
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{
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if (type == EV_KEY && down == 1) {
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switch (code) {
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case KEY_WLAN:
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rfkill_schedule_toggle(&rfkill_wlan);
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break;
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case KEY_BLUETOOTH:
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rfkill_schedule_toggle(&rfkill_bt);
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break;
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default:
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break;
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}
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}
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}
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static int rfkill_connect(struct input_handler *handler, struct input_dev *dev,
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const struct input_device_id *id)
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{
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struct input_handle *handle;
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int error;
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handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
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if (!handle)
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return -ENOMEM;
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handle->dev = dev;
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handle->handler = handler;
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handle->name = "rfkill";
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error = input_register_handle(handle);
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if (error)
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goto err_free_handle;
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error = input_open_device(handle);
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if (error)
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goto err_unregister_handle;
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return 0;
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err_unregister_handle:
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input_unregister_handle(handle);
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err_free_handle:
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kfree(handle);
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return error;
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}
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static void rfkill_disconnect(struct input_handle *handle)
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{
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input_close_device(handle);
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input_unregister_handle(handle);
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kfree(handle);
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}
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static const struct input_device_id rfkill_ids[] = {
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
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.evbit = { BIT(EV_KEY) },
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.keybit = { [LONG(KEY_WLAN)] = BIT(KEY_WLAN) },
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},
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
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.evbit = { BIT(EV_KEY) },
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.keybit = { [LONG(KEY_BLUETOOTH)] = BIT(KEY_BLUETOOTH) },
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},
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{ }
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};
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static struct input_handler rfkill_handler = {
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.event = rfkill_event,
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.connect = rfkill_connect,
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.disconnect = rfkill_disconnect,
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.name = "rfkill",
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.id_table = rfkill_ids,
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};
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static int __init rfkill_handler_init(void)
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{
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return input_register_handler(&rfkill_handler);
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}
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static void __exit rfkill_handler_exit(void)
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{
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input_unregister_handler(&rfkill_handler);
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flush_scheduled_work();
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}
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module_init(rfkill_handler_init);
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module_exit(rfkill_handler_exit);
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@ -0,0 +1,407 @@
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/*
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* Copyright (C) 2006 Ivo van Doorn
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* Copyright (C) 2007 Dmitry Torokhov
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
|
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* the Free Software Foundation; either version 2 of the License, or
|
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
|
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
|
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/workqueue.h>
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#include <linux/capability.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/rfkill.h>
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MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
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MODULE_VERSION("1.0");
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MODULE_DESCRIPTION("RF switch support");
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MODULE_LICENSE("GPL");
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static LIST_HEAD(rfkill_list); /* list of registered rf switches */
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static DEFINE_MUTEX(rfkill_mutex);
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static enum rfkill_state rfkill_states[RFKILL_TYPE_MAX];
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static int rfkill_toggle_radio(struct rfkill *rfkill,
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enum rfkill_state state)
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{
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int retval;
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retval = mutex_lock_interruptible(&rfkill->mutex);
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if (retval)
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return retval;
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if (state != rfkill->state) {
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retval = rfkill->toggle_radio(rfkill->data, state);
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if (!retval)
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rfkill->state = state;
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}
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mutex_unlock(&rfkill->mutex);
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return retval;
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}
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/**
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* rfkill_switch_all - Toggle state of all switches of given type
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* @type: type of interfaces to be affeceted
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* @state: the new state
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*
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* This function toggles state of all switches of given type unless
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* a specific switch is claimed by userspace in which case it is
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* left alone.
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*/
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void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
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{
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struct rfkill *rfkill;
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mutex_lock(&rfkill_mutex);
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rfkill_states[type] = state;
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list_for_each_entry(rfkill, &rfkill_list, node) {
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if (!rfkill->user_claim)
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rfkill_toggle_radio(rfkill, state);
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}
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mutex_unlock(&rfkill_mutex);
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}
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EXPORT_SYMBOL(rfkill_switch_all);
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static ssize_t rfkill_name_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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return sprintf(buf, "%s\n", rfkill->name);
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}
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static ssize_t rfkill_type_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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const char *type;
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switch (rfkill->type) {
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case RFKILL_TYPE_WLAN:
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type = "wlan";
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break;
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case RFKILL_TYPE_BLUETOOTH:
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type = "bluetooth";
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break;
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case RFKILL_TYPE_IRDA:
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type = "irda";
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break;
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default:
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BUG();
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}
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return sprintf(buf, "%s\n", type);
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}
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static ssize_t rfkill_state_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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return sprintf(buf, "%d\n", rfkill->state);
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}
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static ssize_t rfkill_state_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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unsigned int state = simple_strtoul(buf, NULL, 0);
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int error;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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error = rfkill_toggle_radio(rfkill,
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state ? RFKILL_STATE_ON : RFKILL_STATE_OFF);
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if (error)
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return error;
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return count;
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}
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static ssize_t rfkill_claim_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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return sprintf(buf, "%d", rfkill->user_claim);
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}
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static ssize_t rfkill_claim_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct rfkill *rfkill = to_rfkill(dev);
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bool claim = !!simple_strtoul(buf, NULL, 0);
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int error;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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|
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/*
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* Take the global lock to make sure the kernel is not in
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* the middle of rfkill_switch_all
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*/
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error = mutex_lock_interruptible(&rfkill_mutex);
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if (error)
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return error;
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|
||||
if (rfkill->user_claim != claim) {
|
||||
if (!claim)
|
||||
rfkill_toggle_radio(rfkill,
|
||||
rfkill_states[rfkill->type]);
|
||||
rfkill->user_claim = claim;
|
||||
}
|
||||
|
||||
mutex_unlock(&rfkill_mutex);
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
static struct device_attribute rfkill_dev_attrs[] = {
|
||||
__ATTR(name, S_IRUGO, rfkill_name_show, NULL),
|
||||
__ATTR(type, S_IRUGO, rfkill_type_show, NULL),
|
||||
__ATTR(state, S_IRUGO, rfkill_state_show, rfkill_state_store),
|
||||
__ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
|
||||
__ATTR_NULL
|
||||
};
|
||||
|
||||
static void rfkill_release(struct device *dev)
|
||||
{
|
||||
struct rfkill *rfkill = to_rfkill(dev);
|
||||
|
||||
kfree(rfkill);
|
||||
module_put(THIS_MODULE);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
static int rfkill_suspend(struct device *dev, pm_message_t state)
|
||||
{
|
||||
struct rfkill *rfkill = to_rfkill(dev);
|
||||
|
||||
if (dev->power.power_state.event != state.event) {
|
||||
if (state.event == PM_EVENT_SUSPEND) {
|
||||
mutex_lock(&rfkill->mutex);
|
||||
|
||||
if (rfkill->state == RFKILL_STATE_ON)
|
||||
rfkill->toggle_radio(rfkill->data,
|
||||
RFKILL_STATE_OFF);
|
||||
|
||||
mutex_unlock(&rfkill->mutex);
|
||||
}
|
||||
|
||||
dev->power.power_state = state;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int rfkill_resume(struct device *dev)
|
||||
{
|
||||
struct rfkill *rfkill = to_rfkill(dev);
|
||||
|
||||
if (dev->power.power_state.event != PM_EVENT_ON) {
|
||||
mutex_lock(&rfkill->mutex);
|
||||
|
||||
if (rfkill->state == RFKILL_STATE_ON)
|
||||
rfkill->toggle_radio(rfkill->data, RFKILL_STATE_ON);
|
||||
|
||||
mutex_unlock(&rfkill->mutex);
|
||||
}
|
||||
|
||||
dev->power.power_state = PMSG_ON;
|
||||
return 0;
|
||||
}
|
||||
#else
|
||||
#define rfkill_suspend NULL
|
||||
#define rfkill_resume NULL
|
||||
#endif
|
||||
|
||||
static struct class rfkill_class = {
|
||||
.name = "rfkill",
|
||||
.dev_release = rfkill_release,
|
||||
.dev_attrs = rfkill_dev_attrs,
|
||||
.suspend = rfkill_suspend,
|
||||
.resume = rfkill_resume,
|
||||
};
|
||||
|
||||
static int rfkill_add_switch(struct rfkill *rfkill)
|
||||
{
|
||||
int retval;
|
||||
|
||||
retval = mutex_lock_interruptible(&rfkill_mutex);
|
||||
if (retval)
|
||||
return retval;
|
||||
|
||||
retval = rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type]);
|
||||
if (retval)
|
||||
goto out;
|
||||
|
||||
list_add_tail(&rfkill->node, &rfkill_list);
|
||||
|
||||
out:
|
||||
mutex_unlock(&rfkill_mutex);
|
||||
return retval;
|
||||
}
|
||||
|
||||
static void rfkill_remove_switch(struct rfkill *rfkill)
|
||||
{
|
||||
mutex_lock(&rfkill_mutex);
|
||||
list_del_init(&rfkill->node);
|
||||
rfkill_toggle_radio(rfkill, RFKILL_STATE_OFF);
|
||||
mutex_unlock(&rfkill_mutex);
|
||||
}
|
||||
|
||||
/**
|
||||
* rfkill_allocate - allocate memory for rfkill structure.
|
||||
* @parent: device that has rf switch on it
|
||||
* @type: type of the switch (wlan, bluetooth, irda)
|
||||
*
|
||||
* This function should be called by the network driver when it needs
|
||||
* rfkill structure. Once the structure is allocated the driver shoud
|
||||
* finish its initialization by setting name, private data, enable_radio
|
||||
* and disable_radio methods and then register it with rfkill_register().
|
||||
* NOTE: If registration fails the structure shoudl be freed by calling
|
||||
* rfkill_free() otherwise rfkill_unregister() should be used.
|
||||
*/
|
||||
struct rfkill *rfkill_allocate(struct device *parent, enum rfkill_type type)
|
||||
{
|
||||
struct rfkill *rfkill;
|
||||
struct device *dev;
|
||||
|
||||
rfkill = kzalloc(sizeof(struct rfkill), GFP_KERNEL);
|
||||
if (rfkill)
|
||||
return NULL;
|
||||
|
||||
mutex_init(&rfkill->mutex);
|
||||
INIT_LIST_HEAD(&rfkill->node);
|
||||
rfkill->type = type;
|
||||
|
||||
dev = &rfkill->dev;
|
||||
dev->class = &rfkill_class;
|
||||
dev->parent = parent;
|
||||
device_initialize(dev);
|
||||
|
||||
__module_get(THIS_MODULE);
|
||||
|
||||
return rfkill;
|
||||
}
|
||||
EXPORT_SYMBOL(rfkill_allocate);
|
||||
|
||||
/**
|
||||
* rfkill_free - Mark rfkill structure for deletion
|
||||
* @rfkill: rfkill structure to be destroyed
|
||||
*
|
||||
* Decrements reference count of rfkill structure so it is destoryed.
|
||||
* Note that rfkill_free() should _not_ be called after rfkill_unregister().
|
||||
*/
|
||||
void rfkill_free(struct rfkill *rfkill)
|
||||
{
|
||||
if (rfkill)
|
||||
put_device(&rfkill->dev);
|
||||
}
|
||||
EXPORT_SYMBOL(rfkill_free);
|
||||
|
||||
/**
|
||||
* rfkill_register - Register a rfkill structure.
|
||||
* @rfkill: rfkill structure to be registered
|
||||
*
|
||||
* This function should be called by the network driver when the rfkill
|
||||
* structure needs to be registered. Immediately from registration the
|
||||
* switch driver should be able to service calls to toggle_radio.
|
||||
*/
|
||||
int rfkill_register(struct rfkill *rfkill)
|
||||
{
|
||||
static atomic_t rfkill_no = ATOMIC_INIT(0);
|
||||
struct device *dev = &rfkill->dev;
|
||||
int error;
|
||||
|
||||
if (!rfkill->toggle_radio)
|
||||
return -EINVAL;
|
||||
|
||||
error = rfkill_add_switch(rfkill);
|
||||
if (error)
|
||||
return error;
|
||||
|
||||
snprintf(dev->bus_id, sizeof(dev->bus_id),
|
||||
"rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);
|
||||
|
||||
error = device_add(dev);
|
||||
if (error) {
|
||||
rfkill_remove_switch(rfkill);
|
||||
return error;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(rfkill_register);
|
||||
|
||||
/**
|
||||
* rfkill_unregister - Uegister 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. Note that rfkill_free() should
|
||||
* _not_ be called after rfkill_unregister().
|
||||
*/
|
||||
void rfkill_unregister(struct rfkill *rfkill)
|
||||
{
|
||||
device_del(&rfkill->dev);
|
||||
rfkill_remove_switch(rfkill);
|
||||
put_device(&rfkill->dev);
|
||||
}
|
||||
EXPORT_SYMBOL(rfkill_unregister);
|
||||
|
||||
/*
|
||||
* Rfkill module initialization/deinitialization.
|
||||
*/
|
||||
static int __init rfkill_init(void)
|
||||
{
|
||||
int error;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(rfkill_states); i++)
|
||||
rfkill_states[i] = RFKILL_STATE_ON;
|
||||
|
||||
error = class_register(&rfkill_class);
|
||||
if (error) {
|
||||
printk(KERN_ERR "rfkill: unable to register rfkill class\n");
|
||||
return error;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit rfkill_exit(void)
|
||||
{
|
||||
class_unregister(&rfkill_class);
|
||||
}
|
||||
|
||||
module_init(rfkill_init);
|
||||
module_exit(rfkill_exit);
|
||||
Loading…
Reference in New Issue