summaryrefslogtreecommitdiffstats
path: root/drivers/media/rc/gpio-ir-recv.c
blob: 3d99b51384ac9f3329eccd50efe67049e7237e0c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
/* 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/consumer.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;
	struct gpio_desc *gpiod;
	int irq;
};

static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
{
	int val;
	struct gpio_rc_dev *gpio_dev = dev_id;

	val = gpiod_get_value(gpio_dev->gpiod);
	if (val >= 0)
		ir_raw_event_store_edge(gpio_dev->rcdev, val == 1);

	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;
	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;

	gpio_dev->gpiod = devm_gpiod_get(dev, NULL, GPIOD_IN);
	if (IS_ERR(gpio_dev->gpiod)) {
		rc = PTR_ERR(gpio_dev->gpiod);
		/* Just try again if this happens */
		if (rc != -EPROBE_DEFER)
			dev_err(dev, "error getting gpio (%d)\n", rc);
		return rc;
	}
	gpio_dev->irq = gpiod_to_irq(gpio_dev->gpiod);
	if (gpio_dev->irq < 0)
		return gpio_dev->irq;

	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_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_dev->irq, 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 gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		enable_irq_wake(gpio_dev->irq);
	else
		disable_irq(gpio_dev->irq);

	return 0;
}

static int gpio_ir_recv_resume(struct device *dev)
{
	struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		disable_irq_wake(gpio_dev->irq);
	else
		enable_irq(gpio_dev->irq);

	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");