/* Copyright (c) 2012, Code Aurora Forum. 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 and
* only 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.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <media/rc-core.h>
#include <media/gpio-ir-recv.h>
#define GPIO_IR_DRIVER_NAME "gpio-rc-recv"
#define GPIO_IR_DEVICE_NAME "gpio_ir_recv"
struct gpio_rc_dev {
struct rc_dev *rcdev;
int gpio_nr;
bool active_low;
};
static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
{
struct gpio_rc_dev *gpio_dev = dev_id;
int gval;
int rc = 0;
enum raw_event_type type = IR_SPACE;
gval = gpio_get_value_cansleep(gpio_dev->gpio_nr);
if (gval < 0)
goto err_get_value;
if (gpio_dev->active_low)
gval = !gval;
if (gval == 1)
type = IR_PULSE;
rc = ir_raw_event_store_edge(gpio_dev->rcdev, type);
if (rc < 0)
goto err_get_value;
ir_raw_event_handle(gpio_dev->rcdev);
err_get_value:
return IRQ_HANDLED;
}
static int __devinit gpio_ir_recv_probe(struct platform_device *pdev)
{
struct gpio_rc_dev *gpio_dev;
struct rc_dev *rcdev;
const struct gpio_ir_recv_platform_data *pdata =
pdev->dev.platform_data;
int rc;
if (!pdata)
return -EINVAL;
if (pdata->gpio_nr < 0)
return -EINVAL;
gpio_dev = kzalloc(sizeof(struct gpio_rc_dev), GFP_KERNEL);
if (!gpio_dev)
return -ENOMEM;
rcdev = rc_allocate_device();
if (!rcdev) {
rc = -ENOMEM;
goto err_allocate_device;
}
rcdev->driver_type = RC_DRIVER_IR_RAW;
rcdev->allowed_protos = RC_TYPE_ALL;
rcdev->input_name = GPIO_IR_DEVICE_NAME;
rcdev->input_id.bustype = BUS_HOST;
rcdev->driver_name = GPIO_IR_DRIVER_NAME;
rcdev->map_name = RC_MAP_EMPTY;
gpio_dev->rcdev = rcdev;
gpio_dev->gpio_nr = pdata->gpio_nr;
gpio_dev->active_low = pdata->active_low;
rc = gpio_request(pdata->gpio_nr, "gpio-ir-recv");
if (rc < 0)
goto err_gpio_request;
rc = gpio_direction_input(pdata->gpio_nr);
if (rc < 0)
goto err_gpio_direction_input;
rc = rc_register_device(rcdev);
if (rc < 0) {
dev_err(&pdev->dev, "failed to register rc device\n");
goto err_register_rc_device;
}
platform_set_drvdata(pdev, gpio_dev);
rc = request_any_context_irq(gpio_to_irq(pdata->gpio_nr),
gpio_ir_recv_irq,
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
"gpio-ir-recv-irq", gpio_dev);
if (rc < 0)
goto err_request_irq;
return 0;
err_request_irq:
platform_set_drvdata(pdev, NULL);
rc_unregister_device(rcdev);
err_register_rc_device:
err_gpio_direction_input:
gpio_free(pdata->gpio_nr);
err_gpio_request:
rc_free_device(rcdev);
rcdev = NULL;
err_allocate_device:
kfree(gpio_dev);
return rc;
}
static int __devexit gpio_ir_recv_remove(struct platform_device *pdev)
{
struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
free_irq(gpio_to_irq(gpio_dev->gpio_nr), gpio_dev);
platform_set_drvdata(pdev, NULL);
rc_unregister_device(gpio_dev->rcdev);
gpio_free(gpio_dev->gpio_nr);
rc_free_device(gpio_dev->rcdev);
kfree(gpio_dev);
return 0;
}
#ifdef CONFIG_PM
static int gpio_ir_recv_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
if (device_may_wakeup(dev))
enable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
else
disable_irq(gpio_to_irq(gpio_dev->gpio_nr));
return 0;
}
static int gpio_ir_recv_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
if (device_may_wakeup(dev))
disable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
else
enable_irq(gpio_to_irq(gpio_dev->gpio_nr));
return 0;
}
static const struct dev_pm_ops gpio_ir_recv_pm_ops = {
.suspend = gpio_ir_recv_suspend,
.resume = gpio_ir_recv_resume,
};
#endif
static struct platform_driver gpio_ir_recv_driver = {
.probe = gpio_ir_recv_probe,
.remove = __devexit_p(gpio_ir_recv_remove),
.driver = {
.name = GPIO_IR_DRIVER_NAME,
.owner = THIS_MODULE,
#ifdef CONFIG_PM
.pm = &gpio_ir_recv_pm_ops,
#endif
},
};
static int __init gpio_ir_recv_init(void)
{
return platform_driver_register(&gpio_ir_recv_driver);
}
module_init(gpio_ir_recv_init);
static void __exit gpio_ir_recv_exit(void)
{
platform_driver_unregister(&gpio_ir_recv_driver);
}
module_exit(gpio_ir_recv_exit);
MODULE_DESCRIPTION("GPIO IR Receiver driver");
MODULE_LICENSE("GPL v2");
