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/*
* Copyright (C) 2006 - 2007 Ivo van Doorn
* Copyright (C) 2007 Dmitry Torokhov
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/workqueue.h>
#include <linux/capability.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/rfkill.h>
/* Get declaration of rfkill_switch_all() to shut up sparse. */
#include "rfkill-input.h"
MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
MODULE_VERSION("1.0");
MODULE_DESCRIPTION("RF switch support");
MODULE_LICENSE("GPL");
static LIST_HEAD(rfkill_list); /* list of registered rf switches */
static DEFINE_MUTEX(rfkill_mutex);
static enum rfkill_state rfkill_states[RFKILL_TYPE_MAX];
static void rfkill_led_trigger(struct rfkill *rfkill,
enum rfkill_state state)
{
#ifdef CONFIG_RFKILL_LEDS
struct led_trigger *led = &rfkill->led_trigger;
if (!led->name)
return;
if (state == RFKILL_STATE_OFF)
led_trigger_event(led, LED_OFF);
else
led_trigger_event(led, LED_FULL);
#endif /* CONFIG_RFKILL_LEDS */
}
static int rfkill_toggle_radio(struct rfkill *rfkill,
enum rfkill_state state)
{
int retval = 0;
if (state != rfkill->state) {
retval = rfkill->toggle_radio(rfkill->data, state);
if (!retval) {
rfkill->state = state;
rfkill_led_trigger(rfkill, state);
}
}
return retval;
}
/**
* rfkill_switch_all - Toggle state of all switches of given type
* @type: type of interfaces to be affeceted
* @state: the new state
*
* This function toggles state of all switches of given type unless
* a specific switch is claimed by userspace in which case it is
* left alone.
*/
void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
{
struct rfkill *rfkill;
mutex_lock(&rfkill_mutex);
rfkill_states[type] = state;
list_for_each_entry(rfkill, &rfkill_list, node) {
if (!rfkill->user_claim)
rfkill_toggle_radio(rfkill, state);
}
mutex_unlock(&rfkill_mutex);
}
EXPORT_SYMBOL(rfkill_switch_all);
static ssize_t rfkill_name_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct rfkill *rfkill = to_rfkill(dev);
return sprintf(buf, "%s\n", rfkill->name);
}
static ssize_t rfkill_type_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct rfkill *rfkill = to_rfkill(dev);
const char *type;
switch (rfkill->type) {
case RFKILL_TYPE_WLAN:
type = "wlan";
break;
case RFKILL_TYPE_BLUETOOTH:
type = "bluetooth";
break;
case RFKILL_TYPE_UWB:
type = "ultrawideband";
break;
default:
BUG();
}
return sprintf(buf, "%s\n", type);
}
static ssize_t rfkill_state_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct rfkill *rfkill = to_rfkill(dev);
return sprintf(buf, "%d\n", rfkill->state);
}
static ssize_t rfkill_state_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct rfkill *rfkill = to_rfkill(dev);
unsigned int state = simple_strtoul(buf, NULL, 0);
int error;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (mutex_lock_interruptible(&rfkill->mutex))
return -ERESTARTSYS;
error = rfkill_toggle_radio(rfkill,
state ? RFKILL_STATE_ON : RFKILL_STATE_OFF);
mutex_unlock(&rfkill->mutex);
return error ? error : count;
}
static ssize_t rfkill_claim_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct rfkill *rfkill = to_rfkill(dev);
return sprintf(buf, "%d", rfkill->user_claim);
}
static ssize_t rfkill_claim_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct rfkill *rfkill = to_rfkill(dev);
bool claim = !!simple_strtoul(buf, NULL, 0);
int error;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
/*
* Take the global lock to make sure the kernel is not in
* the middle of rfkill_switch_all
*/
error = mutex_lock_interruptible(&rfkill_mutex);
if (error)
return error;
if (rfkill->user_claim_unsupported) {
error = -EOPNOTSUPP;
goto out_unlock;
}
if (rfkill->user_claim != claim) {
if (!claim)
rfkill_toggle_radio(rfkill,
rfkill_states[rfkill->type]);
rfkill->user_claim = claim;
}
out_unlock:
mutex_unlock(&rfkill_mutex);
return error ? error : 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|S_IWUSR, 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 error;
mutex_lock(&rfkill_mutex);
error = rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type]);
if (!error)
list_add_tail(&rfkill->node, &rfkill_list);
mutex_unlock(&rfkill_mutex);
return error;
}
static void
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