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/*
* Copyright (C) 2013 Motorola Mobility LLC.
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307, USA
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/reboot.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#include <linux/gpio.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/qpnp/power-on.h>
struct usr_reset_warning_data {
struct work_struct work;
int gpio;
int irq;
};
static void usr_reset_warning_work(struct work_struct *work)
{
kernel_halt();
}
static irqreturn_t usr_reset_warning_isr(int irq, void *dev)
{
struct usr_reset_warning_data *data = dev;
disable_irq_nosync(irq);
pr_warn("HFF: User initiated HW reset warning.\n");
pr_warn(" 2 sec to reset.Halt the kernel.\n");
/* set HW reset power up reason */
qpnp_pon_store_extra_reset_info(RESET_EXTRA_HW_RESET_REASON,
RESET_EXTRA_HW_RESET_REASON);
schedule_work(&data->work);
return IRQ_HANDLED;
}
#ifdef CONFIG_OF
static int __devinit usr_reset_of_init(struct usr_reset_warning_data *data,
struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
data->gpio = of_get_gpio(np, 0);
return ((data->gpio < 0) ? -EINVAL : 0);
}
#else
static int __devinit usr_reset_of_init(struct usr_reset_warning_data *data,
struct platform_device *pdev)
{
return -EINVAL;
}
#endif
static int __devinit usr_reset_warning_probe(struct platform_device *pdev)
{
struct usr_reset_warning_data *data;
int ret = -EINVAL;
data = devm_kzalloc(&pdev->dev,
sizeof(struct usr_reset_warning_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
if (pdev->dev.of_node)
ret = usr_reset_of_init(data, pdev);
if (ret < 0) {
pr_err("%s:unable to config IRQ: %d\n", __func__, ret);
goto err;
}
ret = gpio_request(data->gpio, "usr_reset_warn");
if (ret < 0) {
pr_err("%s: failed to request usr reset warning gpio: %d\n",
__func__, ret);
goto err;
}
INIT_WORK(&data->work, usr_reset_warning_work);
data->irq = gpio_to_irq(data->gpio);
ret = request_irq(data->irq, usr_reset_warning_isr, IRQF_TRIGGER_LOW,
"usr-reset-warning", data);
if (ret) {
pr_err("%s: usr-reset-warning request irq failed: %d\n",
__func__, ret);
goto irq_err;
}
enable_irq_wake(data->irq);
platform_set_drvdata(pdev, data);
return 0;
irq_err:
gpio_free(data->gpio);
err:
return ret;
}
static int __devexit usr_reset_warning_remove(struct platform_device *pdev)
{
struct usr_reset_warning_data *data = platform_get_drvdata(pdev);
gpio_free(data->gpio);
return 0;
}
#ifdef CONFIG_OF
static struct of_device_id usr_reset_warning_match_table[] = {
{ .compatible = "mmi,usr-reset-warning",
},
{}
};
#endif
static struct platform_driver usr_reset_warning_driver = {
.probe = usr_reset_warning_probe,
.remove = __devexit_p(usr_reset_warning_remove),
.driver = {
.name = "usr-reset-warning",
.of_match_table = of_match_ptr(usr_reset_warning_match_table),
.owner = THIS_MODULE,
},
};
static int __init usr_reset_warning_init(void)
{
return platform_driver_register(&usr_reset_warning_driver);
}
static void __exit usr_reset_warning_exit(void)
{
platform_driver_unregister(&usr_reset_warning_driver);
}
module_init(usr_reset_warning_init);
module_exit(usr_reset_warning_exit);
MODULE_DESCRIPTION("User reset warning driver");
MODULE_LICENSE("GPL");
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