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/*
* Copyright (C) ST-Ericsson AB 2010
* Author: Daniel Martensson / daniel.martensson@stericsson.com
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/tty.h>
#include <linux/notifier.h>
#include <linux/suspend.h>
#ifdef CONFIG_HAS_WAKELOCK
#include <linux/wakelock.h>
#endif /* CONFIG_HAS_WAKELOCK */
#if !defined(GPIO_MODEM_AWR)
/* ZOOM2 TI Adaptor board defaults */
#define GPIO_MODEM_AWR 23
#endif
#if !defined(GPIO_MODEM_CWR)
/* ZOOM2 TI Adaptor board defaults */
#define GPIO_MODEM_CWR 156
#endif
extern void power_notify(bool is_on);
extern void cwr_notify(struct tty_struct *tty, bool asserted);
#ifdef CONFIG_HAS_WAKELOCK
static struct wake_lock awr_wakelock;
static struct wake_lock cwr_wakelock;
#endif /* CONFIG_HAS_WAKELOCK */
static struct tty_struct *pm_ext_tty;
static irqreturn_t cwr_irq(int irq, void *arg)
{
int val;
val = gpio_get_value(GPIO_MODEM_CWR);
#ifdef CONFIG_HAS_WAKELOCK
if (val) {
wake_lock(&cwr_wakelock);
} else {
wake_unlock(&cwr_wakelock);
}
#endif /* CONFIG_HAS_WAKELOCK */
cwr_notify(pm_ext_tty, val == 0 ? false : true);
return IRQ_HANDLED;
}
/* Get power management notifications */
static int pm_notify(struct notifier_block *self, unsigned long val, void *data)
{
switch (val) {
case PM_HIBERNATION_PREPARE:
case PM_SUSPEND_PREPARE:
power_notify(false);
break;
case PM_POST_RESTORE:
case PM_POST_HIBERNATION:
case PM_POST_SUSPEND:
power_notify(true);
break;
case PM_RESTORE_PREPARE:
default:
break;
}
return NOTIFY_DONE;
}
int pm_ext_init(struct tty_struct *tty)
{
int res;
pm_ext_tty = tty;
/*
* NOTE: No need to request AWR since this is done by the board
* file.
*/
/* AWR should be low initially. */
gpio_direction_output(GPIO_MODEM_AWR, 0);
/* Request and configure CWR. */
res = gpio_request(GPIO_MODEM_CWR, "cwr");
if (res < 0) {
printk(KERN_ERR "pm_ext_init: request_gpio_cwr_failed: %d.\n", res);
goto request_gpio_cwr_failed;
}
gpio_direction_input(GPIO_MODEM_CWR);
/* Report initial state if different from low (WARN). */
if (gpio_get_value(GPIO_MODEM_CWR)) {
printk(KERN_WARNING "pm_ext_init: CWR already asserted.\n");
cwr_notify(pm_ext_tty, true);
}
/* Trigger on both falling and rising edges on CWR. */
res = request_irq(gpio_to_irq(GPIO_MODEM_CWR), cwr_irq,
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
"cwr_irq", NULL);
if (res < 0) {
printk(KERN_ERR "pm_ext_init: request_irq_failed: %d.\n", res);
goto request_irq_failed;
}
/* Make IRQ wakeup capable. */
res = enable_irq_wake(gpio_to_irq(GPIO_MODEM_CWR));
if (res < 0) {
printk(KERN_ERR "pm_ext_init: enable_irq_wake_failed: %d.\n", res);
goto enable_irq_wake_failed;
}
#ifdef CONFIG_HAS_WAKELOCK
wake_lock_init(&awr_wakelock, WAKE_LOCK_SUSPEND, "caif_awr");
wake_lock_init(&cwr_wakelock, WAKE_LOCK_SUSPEND, "caif_cwr");
#endif /* CONFIG_HAS_WAKELOCK */
pm_notifier(pm_notify, 0);
return 0;
enable_irq_wake_failed:
request_irq_failed:
gpio_free(GPIO_MODEM_CWR);
request_gpio_cwr_failed:
gpio_free(GPIO_MODEM_AWR);
return -ENODEV;
}
void pm_ext_deinit(struct tty_struct *tty)
{
#ifdef CONFIG_HAS_WAKELOCK
wake_lock_destroy(&awr_wakelock);
wake_lock_destroy(&cwr_wakelock);
#endif /* CONFIG_HAS_WAKELOCK */
free_irq(gpio_to_irq(GPIO_MODEM_CWR), NULL);
gpio_free(GPIO_MODEM_CWR);
gpio_free(GPIO_MODEM_AWR);
}
void pm_ext_prep_down(struct tty_struct *tty)
{
gpio_set_value(GPIO_MODEM_AWR, 0);
#ifdef CONFIG_HAS_WAKELOCK
wake_unlock(&awr_wakelock);
#endif /* CONFIG_HAS_WAKELOCK */
}
void pm_ext_down(struct tty_struct *tty)
{
}
void pm_ext_up(struct tty_struct *tty)
{
#ifdef CONFIG_HAS_WAKELOCK
wake_lock(&awr_wakelock);
#endif /* CONFIG_HAS_WAKELOCK */
/* Assert AWR. */
gpio_set_value(GPIO_MODEM_AWR, 1);
}
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