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/*
* Copyright (C) ST-Ericsson SA 2011
*
* Author: BIBEK BASU <bibek.basu@stericsson.com>
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/hrtimer.h>
#include <linux/workqueue.h>
#include <linux/modem/modem_client.h>
#include <mach/sim_detect.h>
/* time in millisec */
#define TIMER_DELAY 10
struct sim_detect{
struct work_struct timer_expired;
struct device *dev;
struct modem *modem;
struct hrtimer timer;
};
static void inform_modem_release(struct work_struct *work)
{
struct sim_detect *sim_detect =
container_of(work, struct sim_detect, timer_expired);
/* call Modem Access Framework api to release modem */
modem_release(sim_detect->modem);
}
static enum hrtimer_restart timer_callback(struct hrtimer *timer)
{
struct sim_detect *sim_detect =
container_of(timer, struct sim_detect, timer);
schedule_work(&sim_detect->timer_expired);
return HRTIMER_NORESTART;
}
static irqreturn_t sim_activity_irq(int irq, void *dev)
{
struct sim_detect *sim_detect = dev;
/* call Modem Access Framework api to acquire modem */
modem_request(sim_detect->modem);
/* start the timer for 10ms */
hrtimer_start(&sim_detect->timer,
ktime_set(0, TIMER_DELAY*NSEC_PER_MSEC),
HRTIMER_MODE_REL);
return IRQ_HANDLED;
}
#ifdef CONFIG_PM
/**
* sim_detect_suspend() - This routine puts the Sim detect in to sustend state.
* @dev: pointer to device structure.
*
* This routine checks the current ongoing communication with Modem by
* examining the modem_get_usage and work_pending state.
* accordingly prevents suspend if modem communication
* is on-going.
*/
int sim_detect_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct sim_detect *sim_detect = platform_get_drvdata(pdev);
dev_dbg(&pdev->dev, "%s called...\n", __func__);
/* if modem is accessed, event system suspend */
if (modem_get_usage(sim_detect->modem)
|| work_pending(&sim_detect->timer_expired))
return -EBUSY;
else
return 0;
}
static const struct dev_pm_ops sim_detect_dev_pm_ops = {
.suspend = sim_detect_suspend,
};
#endif
static int __devinit sim_detect_probe(struct platform_device *pdev)
{
struct sim_detect_platform_data *plat = dev_get_platdata(&pdev->dev);
struct sim_detect *sim_detect;
int ret;
sim_detect = kzalloc(sizeof(struct sim_detect), GFP_KERNEL);
if (sim_detect == NULL) {
dev_err(&pdev->dev, "failed to allocate memory\n");
return -ENOMEM;
}
sim_detect->dev = &pdev->dev;
INIT_WORK(&sim_detect->timer_expired, inform_modem_release);
hrtimer_init(&sim_detect->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
sim_detect->timer.function = timer_callback;
sim_detect->modem = modem_get(sim_detect->dev, "u8500-shrm-modem");
if (IS_ERR(sim_detect->modem)) {
ret = PTR_ERR(sim_detect->modem);
dev_err(sim_detect->dev, "Could not retrieve the modem\n");
goto out_free;
}
platform_set_drvdata(pdev, sim_detect);
ret = request_threaded_irq(plat->irq_num,
NULL, sim_activity_irq,
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
"sim activity", sim_detect);
if (ret < 0)
goto out_free_irq;
return 0;
out_free_irq:
modem_put(sim_detect->modem);
platform_set_drvdata(pdev, NULL);
out_free:
kfree(sim_detect);
return ret;
}
static int __devexit sim_detect_remove(struct platform_device *pdev)
{
struct sim_detect *sim_detect = platform_get_drvdata(pdev);
modem_put(sim_detect->modem);
platform_set_drvdata(pdev, NULL);
kfree(sim_detect);
return 0;
}
static struct platform_driver sim_detect_driver = {
.driver = {
.name = "sim_detect",
.owner = THIS_MODULE,
#ifdef CONFIG_PM
.pm = &sim_detect_dev_pm_ops,
#endif
},
.probe = sim_detect_probe,
.remove = __devexit_p(sim_detect_remove),
};
static int __init sim_detect_init(void)
{
return platform_driver_register(&sim_detect_driver);
}
module_init(sim_detect_init);
static void __exit sim_detect_exit(void)
{
platform_driver_unregister(&sim_detect_driver);
}
module_exit(sim_detect_exit);
MODULE_AUTHOR("BIBEK BASU <bibek.basu@stericsson.com>");
MODULE_DESCRIPTION("Detects SIM Hot Swap and wakes modem");
MODULE_ALIAS("SIM DETECT INTERRUPT driver");
MODULE_LICENSE("GPL v2");
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