[deliverable/linux.git] / drivers / media / rc / gpio-ir-recv.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/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->priv = gpio_dev;
	rcdev->driver_type = RC_DRIVER_IR_RAW;
	rcdev->allowed_protos = RC_TYPE_ALL;
	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->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:
	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
	},
};
module_platform_driver(gpio_ir_recv_driver);

MODULE_DESCRIPTION("GPIO IR Receiver driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
fd0f6851 RK	1	/* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
	2	*
	3	* This program is free software; you can redistribute it and/or modify
	4	* it under the terms of the GNU General Public License version 2 and
	5	* only version 2 as published by the Free Software Foundation.
	6	*
	7	* This program is distributed in the hope that it will be useful,
	8	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	9	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	10	* GNU General Public License for more details.
	11	*/
	12
	13	#include <linux/kernel.h>
	14	#include <linux/init.h>
	15	#include <linux/module.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/gpio.h>
	18	#include <linux/slab.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/irq.h>
	21	#include <media/rc-core.h>
	22	#include <media/gpio-ir-recv.h>
	23
	24	#define GPIO_IR_DRIVER_NAME "gpio-rc-recv"
	25	#define GPIO_IR_DEVICE_NAME "gpio_ir_recv"
	26
	27	struct gpio_rc_dev {
	28	struct rc_dev *rcdev;
955b4430	29	int gpio_nr;
fd0f6851 RK	30	bool active_low;
	31	};
	32
	33	static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
	34	{
	35	struct gpio_rc_dev *gpio_dev = dev_id;
955b4430	36	int gval;
fd0f6851 RK	37	int rc = 0;
	38	enum raw_event_type type = IR_SPACE;
	39
	40	gval = gpio_get_value_cansleep(gpio_dev->gpio_nr);
	41
	42	if (gval < 0)
	43	goto err_get_value;
	44
	45	if (gpio_dev->active_low)
	46	gval = !gval;
	47
	48	if (gval == 1)
	49	type = IR_PULSE;
	50
	51	rc = ir_raw_event_store_edge(gpio_dev->rcdev, type);
	52	if (rc < 0)
	53	goto err_get_value;
	54
	55	ir_raw_event_handle(gpio_dev->rcdev);
	56
	57	err_get_value:
	58	return IRQ_HANDLED;
	59	}
	60
	61	static int __devinit gpio_ir_recv_probe(struct platform_device *pdev)
	62	{
	63	struct gpio_rc_dev *gpio_dev;
	64	struct rc_dev *rcdev;
	65	const struct gpio_ir_recv_platform_data *pdata =
	66	pdev->dev.platform_data;
	67	int rc;
	68
	69	if (!pdata)
	70	return -EINVAL;
	71
	72	if (pdata->gpio_nr < 0)
	73	return -EINVAL;
	74
	75	gpio_dev = kzalloc(sizeof(struct gpio_rc_dev), GFP_KERNEL);
	76	if (!gpio_dev)
	77	return -ENOMEM;
	78
	79	rcdev = rc_allocate_device();
	80	if (!rcdev) {
	81	rc = -ENOMEM;
	82	goto err_allocate_device;
	83	}
	84
975ef32e	85	rcdev->priv = gpio_dev;
fd0f6851 RK	86	rcdev->driver_type = RC_DRIVER_IR_RAW;
	87	rcdev->allowed_protos = RC_TYPE_ALL;
	88	rcdev->input_name = GPIO_IR_DEVICE_NAME;
975ef32e	89	rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0";
fd0f6851	90	rcdev->input_id.bustype = BUS_HOST;
975ef32e BT	91	rcdev->input_id.vendor = 0x0001;
	92	rcdev->input_id.product = 0x0001;
	93	rcdev->input_id.version = 0x0100;
	94	rcdev->dev.parent = &pdev->dev;
fd0f6851	95	rcdev->driver_name = GPIO_IR_DRIVER_NAME;
2bd237b8	96	rcdev->map_name = pdata->map_name ?: RC_MAP_EMPTY;
fd0f6851 RK	97
	98	gpio_dev->rcdev = rcdev;
	99	gpio_dev->gpio_nr = pdata->gpio_nr;
	100	gpio_dev->active_low = pdata->active_low;
	101
	102	rc = gpio_request(pdata->gpio_nr, "gpio-ir-recv");
	103	if (rc < 0)
	104	goto err_gpio_request;
	105	rc = gpio_direction_input(pdata->gpio_nr);
	106	if (rc < 0)
	107	goto err_gpio_direction_input;
	108
	109	rc = rc_register_device(rcdev);
	110	if (rc < 0) {
	111	dev_err(&pdev->dev, "failed to register rc device\n");
	112	goto err_register_rc_device;
	113	}
	114
	115	platform_set_drvdata(pdev, gpio_dev);
	116
	117	rc = request_any_context_irq(gpio_to_irq(pdata->gpio_nr),
	118	gpio_ir_recv_irq,
	119	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING,
	120	"gpio-ir-recv-irq", gpio_dev);
	121	if (rc < 0)
	122	goto err_request_irq;
	123
	124	return 0;
	125
	126	err_request_irq:
	127	platform_set_drvdata(pdev, NULL);
	128	rc_unregister_device(rcdev);
	129	err_register_rc_device:
	130	err_gpio_direction_input:
	131	gpio_free(pdata->gpio_nr);
	132	err_gpio_request:
	133	rc_free_device(rcdev);
	134	rcdev = NULL;
	135	err_allocate_device:
	136	kfree(gpio_dev);
	137	return rc;
	138	}
	139
	140	static int __devexit gpio_ir_recv_remove(struct platform_device *pdev)
	141	{
	142	struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
	143
	144	free_irq(gpio_to_irq(gpio_dev->gpio_nr), gpio_dev);
	145	platform_set_drvdata(pdev, NULL);
	146	rc_unregister_device(gpio_dev->rcdev);
	147	gpio_free(gpio_dev->gpio_nr);
	148	rc_free_device(gpio_dev->rcdev);
	149	kfree(gpio_dev);
	150	return 0;
	151	}
	152
	153	#ifdef CONFIG_PM
	154	static int gpio_ir_recv_suspend(struct device *dev)
	155	{
	156	struct platform_device *pdev = to_platform_device(dev);
	157	struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
	158
	159	if (device_may_wakeup(dev))
	160	enable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
161	else
162	disable_irq(gpio_to_irq(gpio_dev->gpio_nr));
163
164	return 0;
165	}
166
167	static int gpio_ir_recv_resume(struct device *dev)
168	{
169	struct platform_device *pdev = to_platform_device(dev);
170	struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
171
172	if (device_may_wakeup(dev))
173	disable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
174	else
175	enable_irq(gpio_to_irq(gpio_dev->gpio_nr));
176
177	return 0;
178	}
179
180	static const struct dev_pm_ops gpio_ir_recv_pm_ops = {
181	.suspend = gpio_ir_recv_suspend,
182	.resume = gpio_ir_recv_resume,
183	};
184	#endif
185
186	static struct platform_driver gpio_ir_recv_driver = {
187	.probe = gpio_ir_recv_probe,
188	.remove = __devexit_p(gpio_ir_recv_remove),
189	.driver = {
190	.name = GPIO_IR_DRIVER_NAME,
191	.owner = THIS_MODULE,
192	#ifdef CONFIG_PM
193	.pm = &gpio_ir_recv_pm_ops,
194	#endif
195	},
196	};
81d75e9f	197	module_platform_driver(gpio_ir_recv_driver);
fd0f6851 RK	198
	199	MODULE_DESCRIPTION("GPIO IR Receiver driver");
	200	MODULE_LICENSE("GPL v2");