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/* linux/arch/arm/mach-s5pv210/herring-btlpm.c
* Copyright (C) 2010 Samsung Electronics. All rights reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*/
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/hrtimer.h>
#include <asm/mach-types.h>
#include <mach/gpio-herring.h>
#include "herring.h"
static struct herring_bt_lpm {
struct hrtimer bt_lpm_timer;
ktime_t bt_lpm_delay;
} bt_lpm;
static enum hrtimer_restart bt_enter_lpm(struct hrtimer *timer)
{
gpio_set_value(GPIO_BT_WAKE, 0);
return HRTIMER_NORESTART;
}
void herring_bt_uart_wake_peer(struct uart_port *port)
{
if (!bt_lpm.bt_lpm_timer.function)
return;
hrtimer_try_to_cancel(&bt_lpm.bt_lpm_timer);
gpio_set_value(GPIO_BT_WAKE, 1);
hrtimer_start(&bt_lpm.bt_lpm_timer, bt_lpm.bt_lpm_delay, HRTIMER_MODE_REL);
}
static int __init bt_lpm_init(void)
{
int ret;
if (!machine_is_herring())
return 0;
ret = gpio_request(GPIO_BT_WAKE, "gpio_bt_wake");
if (ret) {
printk(KERN_ERR "Failed to request gpio_bt_wake control\n");
return 0;
}
gpio_direction_output(GPIO_BT_WAKE, GPIO_LEVEL_LOW);
hrtimer_init(&bt_lpm.bt_lpm_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
bt_lpm.bt_lpm_delay = ktime_set(1, 0); /* 1 sec */
bt_lpm.bt_lpm_timer.function = bt_enter_lpm;
return 0;
}
device_initcall(bt_lpm_init);
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