drivers/media/rc/gpio-ir-recv.c - kernel/quantenna - Git at Google

 /* 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 <linux/platform_data/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;
 	struct timer_list flush_timer;
 };

 #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;

 	mod_timer(&gpio_dev->flush_timer,
 		  jiffies + nsecs_to_jiffies(gpio_dev->rcdev->timeout));

 	ir_raw_event_handle(gpio_dev->rcdev);

 err_get_value:
 	return IRQ_HANDLED;
 }

 static void flush_timer(unsigned long arg)
 {
 	struct gpio_rc_dev *gpio_dev = (struct gpio_rc_dev *)arg;
 	DEFINE_IR_RAW_EVENT(ev);

 	ev.timeout = true;
 	ev.duration = gpio_dev->rcdev->timeout;
 	ir_raw_event_store(gpio_dev->rcdev, &ev);
 	ir_raw_event_handle(gpio_dev->rcdev);
 }

 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;
 	rcdev->min_timeout = 0;
 	rcdev->timeout = IR_DEFAULT_TIMEOUT;
 	rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
 	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;

 	setup_timer(&gpio_dev->flush_timer, flush_timer,
 		    (unsigned long)gpio_dev);

 	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);
 	del_timer_sync(&gpio_dev->flush_timer);
 	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");
	/* 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 <linux/platform_data/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;
	struct timer_list flush_timer;
	};

	#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;

	mod_timer(&gpio_dev->flush_timer,
	jiffies + nsecs_to_jiffies(gpio_dev->rcdev->timeout));

	ir_raw_event_handle(gpio_dev->rcdev);

	err_get_value:
	return IRQ_HANDLED;
	}

	static void flush_timer(unsigned long arg)
	{
	struct gpio_rc_dev gpio_dev = (struct gpio_rc_dev )arg;
	DEFINE_IR_RAW_EVENT(ev);

	ev.timeout = true;
	ev.duration = gpio_dev->rcdev->timeout;
	ir_raw_event_store(gpio_dev->rcdev, &ev);
	ir_raw_event_handle(gpio_dev->rcdev);
	}

	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;
	rcdev->min_timeout = 0;
	rcdev->timeout = IR_DEFAULT_TIMEOUT;
	rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
	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;

	setup_timer(&gpio_dev->flush_timer, flush_timer,
	(unsigned long)gpio_dev);

	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);
	del_timer_sync(&gpio_dev->flush_timer);
	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");