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/* 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/of.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <media/rc-core.h>
#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;
gval = gpio_get_value(gpio_dev->gpio_nr);
if (gval < 0)
goto err_get_value;
if (gpio_dev->active_low)
gval = !gval;
rc = ir_raw_event_store_edge(gpio_dev->rcdev, gval == 1);
if (rc < 0)
goto err_get_value;
err_get_value:
return IRQ_HANDLED;
}
static int gpio_ir_recv_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct gpio_rc_dev *gpio_dev;
enum of_gpio_flags flags;
struct rc_dev *rcdev;
int rc;
if (!np)
return -ENODEV;
gpio_dev = devm_kzalloc(dev, sizeof(*gpio_dev), GFP_KERNEL);
if (!gpio_dev)
return -ENOMEM;
rc = of_get_gpio_flags(np, 0, &flags);
if (rc < 0) {
if (rc != -EPROBE_DEFER)
dev_err(dev, "Failed to get gpio flags (%d)\n", rc);
return rc;
}
gpio_dev->gpio_nr = rc;
gpio_dev->active_low = (flags & OF_GPIO_ACTIVE_LOW);
rcdev = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW);
if (!rcdev)
return -ENOMEM;
rcdev->priv = gpio_dev;
rcdev->device_name = GPIO_IR_DEVICE_NAME;
rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0";
rcdev->input_id.bustype = BUS_HOST;
rcdev->input_id.vendor = 0x0001;
rcdev->input_id.product = 0x0001;
rcdev->input_id.version = 0x0100;
rcdev->dev.parent = dev;
rcdev->driver_name = KBUILD_MODNAME;
rcdev->min_timeout = 1;
rcdev->timeout = IR_DEFAULT_TIMEOUT;
rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
rcdev->map_name = of_get_property(np, "linux,rc-map-name", NULL);
if (!rcdev->map_name)
rcdev->map_name = RC_MAP_EMPTY;
gpio_dev->rcdev = rcdev;
rc = devm_gpio_request_one(dev, gpio_dev->gpio_nr, GPIOF_DIR_IN,
"gpio-ir-recv");
if (rc < 0)
return rc;
rc = devm_rc_register_device(dev, rcdev);
if (rc < 0) {
dev_err(dev, "failed to register rc device (%d)\n", rc);
return rc;
}
platform_set_drvdata(pdev, gpio_dev);
return devm_request_irq(dev, gpio_to_irq(gpio_dev->gpio_nr),
gpio_ir_recv_irq,
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
"gpio-ir-recv-irq", gpio_dev);
}
#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 const struct of_device_id gpio_ir_recv_of_match[] = {
{ .compatible = "gpio-ir-receiver", },
{ },
};
MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);
static struct platform_driver gpio_ir_recv_driver = {
.probe = gpio_ir_recv_probe,
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = of_match_ptr(gpio_ir_recv_of_match),
#ifdef CONFIG_PM
.pm = &gpio_ir_recv_pm_ops,
#endif
},
};
module_platform_driver(gpio_ir_recv_driver);
MODULE_DESCRIPTION("GPIO IR Receiver driver");
MODULE_LICENSE("GPL v2");
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