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/*
* GTA02 WLAN power management
*
* (C) 2008, 2009 by Openmoko Inc.
* Author: Andy Green <andy@openmoko.com>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <mach/gta02.h>
#include <mach/gta02-pm-wlan.h>
#include <mach/regs-gpio.h>
#include <mach/regs-gpioj.h>
#include <linux/delay.h>
#include <linux/rfkill.h>
/* ----- Module hardware reset ("power") ----------------------------------- */
void gta02_wlan_reset(int assert_reset)
{
if (assert_reset) {
s3c2410_gpio_setpin(GTA02_GPIO_nWLAN_RESET, 0);
msleep(200); /* probably excessive but we don't have specs */
} else {
s3c2410_gpio_setpin(GTA02_GPIO_nWLAN_RESET, 1);
}
}
/* ----- rfkill ------------------------------------------------------------ */
/*
* S3C MCI handles suspend/resume through device removal/insertion. In order to
* preserve rfkill state, as required in clause 7 of section 3.1 in rfkill.txt,
* we therefore need to maintain rfkill state outside the driver.
*
* This platform driver is as good a place as any other.
*/
static int (*gta02_wlan_rfkill_cb)(void *user, int on);
static void *gta02_wlan_rfkill_user;
static DEFINE_MUTEX(gta02_wlan_rfkill_lock);
static int gta02_wlan_rfkill_on;
/*
* gta02_wlan_query_rfkill_lock is used to obtain the rfkill state before the
* driver is ready to process rfkill callbacks. To prevent the state from
* changing until the driver has completed its initialization, we grab and hold
* the rfkill lock.
*
* A call to gta02_wlan_query_rfkill_lock must be followed by either
* - a call to gta02_wlan_set_rfkill_cb, to complete the setup, or
* - a call to gta02_wlan_query_rfkill_unlock to abort the setup process.
*/
int gta02_wlan_query_rfkill_lock(void)
{
mutex_lock(>a02_wlan_rfkill_lock);
return gta02_wlan_rfkill_on;
}
EXPORT_SYMBOL_GPL(gta02_wlan_query_rfkill_lock);
void gta02_wlan_query_rfkill_unlock(void)
{
mutex_unlock(>a02_wlan_rfkill_lock);
}
EXPORT_SYMBOL_GPL(gta02_wlan_query_rfkill_unlock);
void gta02_wlan_set_rfkill_cb(int (*cb)(void *user, int on), void *user)
{
BUG_ON(!mutex_is_locked(>a02_wlan_rfkill_lock));
BUG_ON(gta02_wlan_rfkill_cb);
gta02_wlan_rfkill_cb = cb;
gta02_wlan_rfkill_user = user;
mutex_unlock(>a02_wlan_rfkill_lock);
}
EXPORT_SYMBOL_GPL(gta02_wlan_set_rfkill_cb);
void gta02_wlan_clear_rfkill_cb(void)
{
mutex_lock(>a02_wlan_rfkill_lock);
BUG_ON(!gta02_wlan_rfkill_cb);
gta02_wlan_rfkill_cb = NULL;
mutex_unlock(>a02_wlan_rfkill_lock);
}
EXPORT_SYMBOL_GPL(gta02_wlan_clear_rfkill_cb);
static int gta02_wlan_toggle_radio(void *data, enum rfkill_state state)
{
struct device *dev = data;
int on = state == RFKILL_STATE_UNBLOCKED;
int res = 0;
dev_dbg(dev, "gta02_wlan_toggle_radio: state %d (%p)\n",
state, gta02_wlan_rfkill_cb);
mutex_lock(>a02_wlan_rfkill_lock);
if (gta02_wlan_rfkill_cb)
res = gta02_wlan_rfkill_cb(gta02_wlan_rfkill_user, on);
if (!res)
gta02_wlan_rfkill_on = on;
mutex_unlock(>a02_wlan_rfkill_lock);
return res;
}
/* ----- Initialization/removal -------------------------------------------- */
static int __init gta02_wlan_probe(struct platform_device *pdev)
{
/* default-on for now */
const int default_state = 1;
struct rfkill *rfkill;
int error;
dev_info(&pdev->dev, "starting\n");
s3c2410_gpio_cfgpin(GTA02_GPIO_nWLAN_RESET, S3C2410_GPIO_OUTPUT);
gta02_wlan_reset(1);
gta02_wlan_reset(0);
rfkill = rfkill_allocate(&pdev->dev, RFKILL_TYPE_WLAN);
rfkill->name = "ar6000";
rfkill->data = &pdev->dev;
rfkill->state = default_state ? RFKILL_STATE_ON : RFKILL_STATE_OFF;
/*
* If the WLAN driver somehow managed to get activated before we're
* ready, the driver is now in an unknown state, which isn't something
* we're prepared to handle. This can't happen, so just fail hard.
*/
BUG_ON(gta02_wlan_rfkill_cb);
gta02_wlan_rfkill_on = default_state;
rfkill->toggle_radio = gta02_wlan_toggle_radio;
error = rfkill_register(rfkill);
if (error) {
rfkill_free(rfkill);
return error;
}
dev_set_drvdata(&pdev->dev, rfkill);
return 0;
}
static int gta02_wlan_remove(struct platform_device *pdev)
{
struct rfkill *rfkill = dev_get_drvdata(&pdev->dev);
rfkill_unregister(rfkill);
rfkill_free(rfkill);
return 0;
}
static struct platform_driver gta02_wlan_driver = {
.probe = gta02_wlan_probe,
.remove = gta02_wlan_remove,
.driver = {
.name = "gta02-pm-wlan",
},
};
static int __devinit gta02_wlan_init(void)
{
return platform_driver_register(>a02_wlan_driver);
}
static void gta02_wlan_exit(void)
{
platform_driver_unregister(>a02_wlan_driver);
}
module_init(gta02_wlan_init);
module_exit(gta02_wlan_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Andy Green <andy@openmoko.com>");
MODULE_DESCRIPTION("Openmoko GTA02 WLAN power management");
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