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/*
* GTA02 WLAN power management
*
* (C) 2008 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/platform_device.h>
#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <asm/plat-s3c24xx/neo1973.h>
#include <mach/gta02.h>
#include <mach/regs-gpio.h>
#include <mach/regs-gpioj.h>
#include <linux/delay.h>
static ssize_t gta02_wlan_read(struct device *dev,
struct device_attribute *attr, char *buf)
{
if (s3c2410_gpio_getpin(GTA02_CHIP_PWD))
return strlcpy(buf, "0\n", 3);
return strlcpy(buf, "1\n", 3);
}
static ssize_t gta02_wlan_write(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
unsigned long on = simple_strtoul(buf, NULL, 10) & 1;
if (!on) {
s3c2410_gpio_setpin(GTA02_CHIP_PWD, 1);
s3c2410_gpio_setpin(GTA02_GPIO_nWLAN_RESET, 0);
return count;
}
/* power up sequencing */
s3c2410_gpio_setpin(GTA02_CHIP_PWD, 1);
s3c2410_gpio_setpin(GTA02_GPIO_nWLAN_RESET, 0);
msleep(100);
s3c2410_gpio_setpin(GTA02_CHIP_PWD, 0);
msleep(100);
s3c2410_gpio_setpin(GTA02_GPIO_nWLAN_RESET, 1);
return count;
}
static DEVICE_ATTR(power_on, 0644, gta02_wlan_read, gta02_wlan_write);
#ifdef CONFIG_PM
static int gta02_wlan_suspend(struct platform_device *pdev, pm_message_t state)
{
dev_dbg(&pdev->dev, "suspending\n");
return 0;
}
static int gta02_wlan_resume(struct platform_device *pdev)
{
dev_dbg(&pdev->dev, "resuming\n");
return 0;
}
#else
#define gta02_wlan_suspend NULL
#define gta02_wlan_resume NULL
#endif
static struct attribute *gta02_wlan_sysfs_entries[] = {
&dev_attr_power_on.attr,
NULL
};
static struct attribute_group gta02_wlan_attr_group = {
.name = NULL,
.attrs = gta02_wlan_sysfs_entries,
};
static int __init gta02_wlan_probe(struct platform_device *pdev)
{
if (!machine_is_neo1973_gta02())
return -EINVAL;
dev_info(&pdev->dev, "starting\n");
/* Power is down */
s3c2410_gpio_setpin(GTA02_CHIP_PWD, 1);
s3c2410_gpio_cfgpin(GTA02_CHIP_PWD, S3C2410_GPIO_OUTPUT);
/* reset is asserted */
s3c2410_gpio_setpin(GTA02_GPIO_nWLAN_RESET, 0);
s3c2410_gpio_cfgpin(GTA02_GPIO_nWLAN_RESET, S3C2410_GPIO_OUTPUT);
return sysfs_create_group(&pdev->dev.kobj, >a02_wlan_attr_group);
}
static int gta02_wlan_remove(struct platform_device *pdev)
{
sysfs_remove_group(&pdev->dev.kobj, >a02_wlan_attr_group);
return 0;
}
static struct platform_driver gta02_wlan_driver = {
.probe = gta02_wlan_probe,
.remove = gta02_wlan_remove,
.suspend = gta02_wlan_suspend,
.resume = gta02_wlan_resume,
.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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