[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/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");
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>
8ab1aa87	19	#include <linux/of.h>
2fd7f398	20	#include <linux/of_gpio.h>
fd0f6851 RK	21	#include <linux/platform_device.h>
	22	#include <linux/irq.h>
	23	#include <media/rc-core.h>
eb4b0ec7	24	#include <linux/platform_data/media/gpio-ir-recv.h>
fd0f6851 RK	25
	26	#define GPIO_IR_DRIVER_NAME "gpio-rc-recv"
	27	#define GPIO_IR_DEVICE_NAME "gpio_ir_recv"
	28
	29	struct gpio_rc_dev {
	30	struct rc_dev *rcdev;
955b4430	31	int gpio_nr;
fd0f6851	32	bool active_low;
3fb136f3	33	struct timer_list flush_timer;
fd0f6851 RK	34	};
fd0f6851 RK	35
2fd7f398 SH	36	#ifdef CONFIG_OF
	37	/*
	38	* Translate OpenFirmware node properties into platform_data
	39	*/
	40	static int gpio_ir_recv_get_devtree_pdata(struct device *dev,
	41	struct gpio_ir_recv_platform_data *pdata)
	42	{
	43	struct device_node *np = dev->of_node;
	44	enum of_gpio_flags flags;
	45	int gpio;
	46
	47	gpio = of_get_gpio_flags(np, 0, &flags);
	48	if (gpio < 0) {
	49	if (gpio != -EPROBE_DEFER)
	50	dev_err(dev, "Failed to get gpio flags (%d)\n", gpio);
	51	return gpio;
	52	}
	53
	54	pdata->gpio_nr = gpio;
	55	pdata->active_low = (flags & OF_GPIO_ACTIVE_LOW);
	56	/* probe() takes care of map_name == NULL or allowed_protos == 0 */
	57	pdata->map_name = of_get_property(np, "linux,rc-map-name", NULL);
	58	pdata->allowed_protos = 0;
	59
	60	return 0;
	61	}
	62
7f099a75	63	static const struct of_device_id gpio_ir_recv_of_match[] = {
2fd7f398 SH	64	{ .compatible = "gpio-ir-receiver", },
	65	{ },
	66	};
	67	MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);
	68
	69	#else /* !CONFIG_OF */
	70
	71	#define gpio_ir_recv_get_devtree_pdata(dev, pdata) (-ENOSYS)
	72
	73	#endif
	74
fd0f6851 RK	75	static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
	76	{
	77	struct gpio_rc_dev *gpio_dev = dev_id;
955b4430	78	int gval;
fd0f6851 RK	79	int rc = 0;
	80	enum raw_event_type type = IR_SPACE;
	81
64657066	82	gval = gpio_get_value(gpio_dev->gpio_nr);
fd0f6851 RK	83
	84	if (gval < 0)
	85	goto err_get_value;
	86
	87	if (gpio_dev->active_low)
	88	gval = !gval;
	89
	90	if (gval == 1)
	91	type = IR_PULSE;
	92
	93	rc = ir_raw_event_store_edge(gpio_dev->rcdev, type);
	94	if (rc < 0)
	95	goto err_get_value;
	96
3fb136f3 EN	97	mod_timer(&gpio_dev->flush_timer,
	98	jiffies + nsecs_to_jiffies(gpio_dev->rcdev->timeout));
	99
fd0f6851 RK	100	ir_raw_event_handle(gpio_dev->rcdev);
	101
	102	err_get_value:
	103	return IRQ_HANDLED;
	104	}
	105
3fb136f3 EN	106	static void flush_timer(unsigned long arg)
	107	{
	108	struct gpio_rc_dev gpio_dev = (struct gpio_rc_dev )arg;
	109	DEFINE_IR_RAW_EVENT(ev);
	110
	111	ev.timeout = true;
	112	ev.duration = gpio_dev->rcdev->timeout;
	113	ir_raw_event_store(gpio_dev->rcdev, &ev);
	114	ir_raw_event_handle(gpio_dev->rcdev);
	115	}
	116
4c62e976	117	static int gpio_ir_recv_probe(struct platform_device *pdev)
fd0f6851 RK	118	{
	119	struct gpio_rc_dev *gpio_dev;
	120	struct rc_dev *rcdev;
	121	const struct gpio_ir_recv_platform_data *pdata =
	122	pdev->dev.platform_data;
	123	int rc;
	124
2fd7f398 SH	125	if (pdev->dev.of_node) {
	126	struct gpio_ir_recv_platform_data *dtpdata =
	127	devm_kzalloc(&pdev->dev, sizeof(*dtpdata), GFP_KERNEL);
	128	if (!dtpdata)
	129	return -ENOMEM;
	130	rc = gpio_ir_recv_get_devtree_pdata(&pdev->dev, dtpdata);
	131	if (rc)
	132	return rc;
	133	pdata = dtpdata;
	134	}
	135
fd0f6851 RK	136	if (!pdata)
	137	return -EINVAL;
	138
	139	if (pdata->gpio_nr < 0)
	140	return -EINVAL;
	141
	142	gpio_dev = kzalloc(sizeof(struct gpio_rc_dev), GFP_KERNEL);
	143	if (!gpio_dev)
	144	return -ENOMEM;
	145
	146	rcdev = rc_allocate_device();
	147	if (!rcdev) {
	148	rc = -ENOMEM;
	149	goto err_allocate_device;
	150	}
	151
975ef32e	152	rcdev->priv = gpio_dev;
fd0f6851	153	rcdev->driver_type = RC_DRIVER_IR_RAW;
fd0f6851	154	rcdev->input_name = GPIO_IR_DEVICE_NAME;
975ef32e	155	rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0";
fd0f6851	156	rcdev->input_id.bustype = BUS_HOST;
975ef32e BT	157	rcdev->input_id.vendor = 0x0001;
	158	rcdev->input_id.product = 0x0001;
	159	rcdev->input_id.version = 0x0100;
	160	rcdev->dev.parent = &pdev->dev;
fd0f6851	161	rcdev->driver_name = GPIO_IR_DRIVER_NAME;
3fb136f3 EN	162	rcdev->min_timeout = 0;
	163	rcdev->timeout = IR_DEFAULT_TIMEOUT;
	164	rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
500c3201	165	if (pdata->allowed_protos)
c5540fbb	166	rcdev->allowed_protocols = pdata->allowed_protos;
500c3201	167	else
c5540fbb	168	rcdev->allowed_protocols = RC_BIT_ALL;
2bd237b8	169	rcdev->map_name = pdata->map_name ?: RC_MAP_EMPTY;
fd0f6851 RK	170
	171	gpio_dev->rcdev = rcdev;
	172	gpio_dev->gpio_nr = pdata->gpio_nr;
	173	gpio_dev->active_low = pdata->active_low;
	174
3fb136f3 EN	175	setup_timer(&gpio_dev->flush_timer, flush_timer,
	176	(unsigned long)gpio_dev);
	177
fd0f6851 RK	178	rc = gpio_request(pdata->gpio_nr, "gpio-ir-recv");
	179	if (rc < 0)
	180	goto err_gpio_request;
	181	rc = gpio_direction_input(pdata->gpio_nr);
	182	if (rc < 0)
	183	goto err_gpio_direction_input;
	184
	185	rc = rc_register_device(rcdev);
	186	if (rc < 0) {
	187	dev_err(&pdev->dev, "failed to register rc device\n");
	188	goto err_register_rc_device;
	189	}
	190
	191	platform_set_drvdata(pdev, gpio_dev);
	192
	193	rc = request_any_context_irq(gpio_to_irq(pdata->gpio_nr),
	194	gpio_ir_recv_irq,
	195	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING,
	196	"gpio-ir-recv-irq", gpio_dev);
	197	if (rc < 0)
	198	goto err_request_irq;
	199
	200	return 0;
	201
	202	err_request_irq:
fd0f6851	203	rc_unregister_device(rcdev);
e5d85b9a	204	rcdev = NULL;
fd0f6851 RK	205	err_register_rc_device:
	206	err_gpio_direction_input:
	207	gpio_free(pdata->gpio_nr);
	208	err_gpio_request:
	209	rc_free_device(rcdev);
fd0f6851 RK	210	err_allocate_device:
	211	kfree(gpio_dev);
	212	return rc;
	213	}
	214
4c62e976	215	static int gpio_ir_recv_remove(struct platform_device *pdev)
fd0f6851 RK	216	{
	217	struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
	218
	219	free_irq(gpio_to_irq(gpio_dev->gpio_nr), gpio_dev);
3fb136f3	220	del_timer_sync(&gpio_dev->flush_timer);
fd0f6851 RK	221	rc_unregister_device(gpio_dev->rcdev);
fd0f6851 RK	222	gpio_free(gpio_dev->gpio_nr);
fd0f6851 RK	223	kfree(gpio_dev);
	224	return 0;
	225	}
	226
	227	#ifdef CONFIG_PM
	228	static int gpio_ir_recv_suspend(struct device *dev)
	229	{
	230	struct platform_device *pdev = to_platform_device(dev);
	231	struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
	232
	233	if (device_may_wakeup(dev))
	234	enable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
	235	else
	236	disable_irq(gpio_to_irq(gpio_dev->gpio_nr));
	237
	238	return 0;
	239	}
	240
	241	static int gpio_ir_recv_resume(struct device *dev)
	242	{
	243	struct platform_device *pdev = to_platform_device(dev);
	244	struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
	245
	246	if (device_may_wakeup(dev))
	247	disable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
	248	else
	249	enable_irq(gpio_to_irq(gpio_dev->gpio_nr));
	250
	251	return 0;
	252	}
	253
	254	static const struct dev_pm_ops gpio_ir_recv_pm_ops = {
	255	.suspend = gpio_ir_recv_suspend,
	256	.resume = gpio_ir_recv_resume,
	257	};
	258	#endif
	259
	260	static struct platform_driver gpio_ir_recv_driver = {
	261	.probe = gpio_ir_recv_probe,
4c62e976	262	.remove = gpio_ir_recv_remove,
fd0f6851 RK	263	.driver = {
fd0f6851 RK	264	.name = GPIO_IR_DRIVER_NAME,
2fd7f398	265	.of_match_table = of_match_ptr(gpio_ir_recv_of_match),
fd0f6851 RK	266	#ifdef CONFIG_PM
	267	.pm = &gpio_ir_recv_pm_ops,
	268	#endif
	269	},
	270	};
81d75e9f	271	module_platform_driver(gpio_ir_recv_driver);
fd0f6851 RK	272
	273	MODULE_DESCRIPTION("GPIO IR Receiver driver");
	274	MODULE_LICENSE("GPL v2");