253 lines
6.0 KiB
C
253 lines
6.0 KiB
C
/* 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>
|
|
#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;
|
|
};
|
|
|
|
#ifdef CONFIG_OF
|
|
/*
|
|
* Translate OpenFirmware node properties into platform_data
|
|
*/
|
|
static int gpio_ir_recv_get_devtree_pdata(struct device *dev,
|
|
struct gpio_ir_recv_platform_data *pdata)
|
|
{
|
|
struct device_node *np = dev->of_node;
|
|
enum of_gpio_flags flags;
|
|
int gpio;
|
|
|
|
gpio = of_get_gpio_flags(np, 0, &flags);
|
|
if (gpio < 0) {
|
|
if (gpio != -EPROBE_DEFER)
|
|
dev_err(dev, "Failed to get gpio flags (%d)\n", gpio);
|
|
return gpio;
|
|
}
|
|
|
|
pdata->gpio_nr = gpio;
|
|
pdata->active_low = (flags & OF_GPIO_ACTIVE_LOW);
|
|
/* probe() takes care of map_name == NULL or allowed_protos == 0 */
|
|
pdata->map_name = of_get_property(np, "linux,rc-map-name", NULL);
|
|
pdata->allowed_protos = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id gpio_ir_recv_of_match[] = {
|
|
{ .compatible = "gpio-ir-receiver", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);
|
|
|
|
#else /* !CONFIG_OF */
|
|
|
|
#define gpio_ir_recv_get_devtree_pdata(dev, pdata) (-ENOSYS)
|
|
|
|
#endif
|
|
|
|
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(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 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 (pdev->dev.of_node) {
|
|
struct gpio_ir_recv_platform_data *dtpdata =
|
|
devm_kzalloc(&pdev->dev, sizeof(*dtpdata), GFP_KERNEL);
|
|
if (!dtpdata)
|
|
return -ENOMEM;
|
|
rc = gpio_ir_recv_get_devtree_pdata(&pdev->dev, dtpdata);
|
|
if (rc)
|
|
return rc;
|
|
pdata = dtpdata;
|
|
}
|
|
|
|
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->priv = gpio_dev;
|
|
rcdev->driver_type = RC_DRIVER_IR_RAW;
|
|
rcdev->input_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 = &pdev->dev;
|
|
rcdev->driver_name = GPIO_IR_DRIVER_NAME;
|
|
if (pdata->allowed_protos)
|
|
rcdev->allowed_protocols = pdata->allowed_protos;
|
|
else
|
|
rcdev->allowed_protocols = RC_BIT_ALL;
|
|
rcdev->map_name = pdata->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:
|
|
rc_unregister_device(rcdev);
|
|
rcdev = NULL;
|
|
err_register_rc_device:
|
|
err_gpio_direction_input:
|
|
gpio_free(pdata->gpio_nr);
|
|
err_gpio_request:
|
|
rc_free_device(rcdev);
|
|
err_allocate_device:
|
|
kfree(gpio_dev);
|
|
return rc;
|
|
}
|
|
|
|
static int 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);
|
|
rc_unregister_device(gpio_dev->rcdev);
|
|
gpio_free(gpio_dev->gpio_nr);
|
|
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 = gpio_ir_recv_remove,
|
|
.driver = {
|
|
.name = GPIO_IR_DRIVER_NAME,
|
|
.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");
|