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13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/module.h>
16#include <linux/interrupt.h>
17#include <linux/gpio/consumer.h>
18#include <linux/slab.h>
19#include <linux/of.h>
20#include <linux/of_gpio.h>
21#include <linux/platform_device.h>
22#include <linux/irq.h>
23#include <media/rc-core.h>
24
25#define GPIO_IR_DEVICE_NAME "gpio_ir_recv"
26
27struct gpio_rc_dev {
28 struct rc_dev *rcdev;
29 struct gpio_desc *gpiod;
30 int irq;
31};
32
33static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
34{
35 int val;
36 struct gpio_rc_dev *gpio_dev = dev_id;
37
38 val = gpiod_get_value(gpio_dev->gpiod);
39 if (val >= 0)
40 ir_raw_event_store_edge(gpio_dev->rcdev, val == 1);
41
42 return IRQ_HANDLED;
43}
44
45static int gpio_ir_recv_probe(struct platform_device *pdev)
46{
47 struct device *dev = &pdev->dev;
48 struct device_node *np = dev->of_node;
49 struct gpio_rc_dev *gpio_dev;
50 struct rc_dev *rcdev;
51 int rc;
52
53 if (!np)
54 return -ENODEV;
55
56 gpio_dev = devm_kzalloc(dev, sizeof(*gpio_dev), GFP_KERNEL);
57 if (!gpio_dev)
58 return -ENOMEM;
59
60 gpio_dev->gpiod = devm_gpiod_get(dev, NULL, GPIOD_IN);
61 if (IS_ERR(gpio_dev->gpiod)) {
62 rc = PTR_ERR(gpio_dev->gpiod);
63
64 if (rc != -EPROBE_DEFER)
65 dev_err(dev, "error getting gpio (%d)\n", rc);
66 return rc;
67 }
68 gpio_dev->irq = gpiod_to_irq(gpio_dev->gpiod);
69 if (gpio_dev->irq < 0)
70 return gpio_dev->irq;
71
72 rcdev = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW);
73 if (!rcdev)
74 return -ENOMEM;
75
76 rcdev->priv = gpio_dev;
77 rcdev->device_name = GPIO_IR_DEVICE_NAME;
78 rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0";
79 rcdev->input_id.bustype = BUS_HOST;
80 rcdev->input_id.vendor = 0x0001;
81 rcdev->input_id.product = 0x0001;
82 rcdev->input_id.version = 0x0100;
83 rcdev->dev.parent = dev;
84 rcdev->driver_name = KBUILD_MODNAME;
85 rcdev->min_timeout = 1;
86 rcdev->timeout = IR_DEFAULT_TIMEOUT;
87 rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
88 rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
89 rcdev->map_name = of_get_property(np, "linux,rc-map-name", NULL);
90 if (!rcdev->map_name)
91 rcdev->map_name = RC_MAP_EMPTY;
92
93 gpio_dev->rcdev = rcdev;
94
95 rc = devm_rc_register_device(dev, rcdev);
96 if (rc < 0) {
97 dev_err(dev, "failed to register rc device (%d)\n", rc);
98 return rc;
99 }
100
101 platform_set_drvdata(pdev, gpio_dev);
102
103 return devm_request_irq(dev, gpio_dev->irq, gpio_ir_recv_irq,
104 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
105 "gpio-ir-recv-irq", gpio_dev);
106}
107
108#ifdef CONFIG_PM
109static int gpio_ir_recv_suspend(struct device *dev)
110{
111 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
112
113 if (device_may_wakeup(dev))
114 enable_irq_wake(gpio_dev->irq);
115 else
116 disable_irq(gpio_dev->irq);
117
118 return 0;
119}
120
121static int gpio_ir_recv_resume(struct device *dev)
122{
123 struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
124
125 if (device_may_wakeup(dev))
126 disable_irq_wake(gpio_dev->irq);
127 else
128 enable_irq(gpio_dev->irq);
129
130 return 0;
131}
132
133static const struct dev_pm_ops gpio_ir_recv_pm_ops = {
134 .suspend = gpio_ir_recv_suspend,
135 .resume = gpio_ir_recv_resume,
136};
137#endif
138
139static const struct of_device_id gpio_ir_recv_of_match[] = {
140 { .compatible = "gpio-ir-receiver", },
141 { },
142};
143MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);
144
145static struct platform_driver gpio_ir_recv_driver = {
146 .probe = gpio_ir_recv_probe,
147 .driver = {
148 .name = KBUILD_MODNAME,
149 .of_match_table = of_match_ptr(gpio_ir_recv_of_match),
150#ifdef CONFIG_PM
151 .pm = &gpio_ir_recv_pm_ops,
152#endif
153 },
154};
155module_platform_driver(gpio_ir_recv_driver);
156
157MODULE_DESCRIPTION("GPIO IR Receiver driver");
158MODULE_LICENSE("GPL v2");
159
