drivers/media/rc/gpio-ir-recv.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
   3  */
   4
   5 #include <linux/kernel.h>
   6 #include <linux/init.h>
   7 #include <linux/module.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/gpio/consumer.h>
  10 #include <linux/slab.h>
  11 #include <linux/of.h>
  12 #include <linux/of_gpio.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/irq.h>
  15 #include <media/rc-core.h>
  16
  17 #define GPIO_IR_DEVICE_NAME     "gpio_ir_recv"
  18
  19 struct gpio_rc_dev {
  20         struct rc_dev *rcdev;
  21         struct gpio_desc *gpiod;
  22         int irq;
  23 };
  24
  25 static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
  26 {
  27         int val;
  28         struct gpio_rc_dev *gpio_dev = dev_id;
  29
  30         val = gpiod_get_value(gpio_dev->gpiod);
  31         if (val >= 0)
  32                 ir_raw_event_store_edge(gpio_dev->rcdev, val == 1);
  33
  34         return IRQ_HANDLED;
  35 }
  36
  37 static int gpio_ir_recv_probe(struct platform_device *pdev)
  38 {
  39         struct device *dev = &pdev->dev;
  40         struct device_node *np = dev->of_node;
  41         struct gpio_rc_dev *gpio_dev;
  42         struct rc_dev *rcdev;
  43         int rc;
  44
  45         if (!np)
  46                 return -ENODEV;
  47
  48         gpio_dev = devm_kzalloc(dev, sizeof(*gpio_dev), GFP_KERNEL);
  49         if (!gpio_dev)
  50                 return -ENOMEM;
  51
  52         gpio_dev->gpiod = devm_gpiod_get(dev, NULL, GPIOD_IN);
  53         if (IS_ERR(gpio_dev->gpiod)) {
  54                 rc = PTR_ERR(gpio_dev->gpiod);
  55                 /* Just try again if this happens */
  56                 if (rc != -EPROBE_DEFER)
  57                         dev_err(dev, "error getting gpio (%d)\n", rc);
  58                 return rc;
  59         }
  60         gpio_dev->irq = gpiod_to_irq(gpio_dev->gpiod);
  61         if (gpio_dev->irq < 0)
  62                 return gpio_dev->irq;
  63
  64         rcdev = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW);
  65         if (!rcdev)
  66                 return -ENOMEM;
  67
  68         rcdev->priv = gpio_dev;
  69         rcdev->device_name = GPIO_IR_DEVICE_NAME;
  70         rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0";
  71         rcdev->input_id.bustype = BUS_HOST;
  72         rcdev->input_id.vendor = 0x0001;
  73         rcdev->input_id.product = 0x0001;
  74         rcdev->input_id.version = 0x0100;
  75         rcdev->dev.parent = dev;
  76         rcdev->driver_name = KBUILD_MODNAME;
  77         rcdev->min_timeout = 1;
  78         rcdev->timeout = IR_DEFAULT_TIMEOUT;
  79         rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
  80         rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
  81         rcdev->map_name = of_get_property(np, "linux,rc-map-name", NULL);
  82         if (!rcdev->map_name)
  83                 rcdev->map_name = RC_MAP_EMPTY;
  84
  85         gpio_dev->rcdev = rcdev;
  86
  87         rc = devm_rc_register_device(dev, rcdev);
  88         if (rc < 0) {
  89                 dev_err(dev, "failed to register rc device (%d)\n", rc);
  90                 return rc;
  91         }
  92
  93         platform_set_drvdata(pdev, gpio_dev);
  94
  95         return devm_request_irq(dev, gpio_dev->irq, gpio_ir_recv_irq,
  96                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
  97                                 "gpio-ir-recv-irq", gpio_dev);
  98 }
  99
 100 #ifdef CONFIG_PM
 101 static int gpio_ir_recv_suspend(struct device *dev)
 102 {
 103         struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
 104
 105         if (device_may_wakeup(dev))
 106                 enable_irq_wake(gpio_dev->irq);
 107         else
 108                 disable_irq(gpio_dev->irq);
 109
 110         return 0;
 111 }
 112
 113 static int gpio_ir_recv_resume(struct device *dev)
 114 {
 115         struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
 116
 117         if (device_may_wakeup(dev))
 118                 disable_irq_wake(gpio_dev->irq);
 119         else
 120                 enable_irq(gpio_dev->irq);
 121
 122         return 0;
 123 }
 124
 125 static const struct dev_pm_ops gpio_ir_recv_pm_ops = {
 126         .suspend        = gpio_ir_recv_suspend,
 127         .resume         = gpio_ir_recv_resume,
 128 };
 129 #endif
 130
 131 static const struct of_device_id gpio_ir_recv_of_match[] = {
 132         { .compatible = "gpio-ir-receiver", },
 133         { },
 134 };
 135 MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);
 136
 137 static struct platform_driver gpio_ir_recv_driver = {
 138         .probe  = gpio_ir_recv_probe,
 139         .driver = {
 140                 .name   = KBUILD_MODNAME,
 141                 .of_match_table = of_match_ptr(gpio_ir_recv_of_match),
 142 #ifdef CONFIG_PM
 143                 .pm     = &gpio_ir_recv_pm_ops,
 144 #endif
 145         },
 146 };
 147 module_platform_driver(gpio_ir_recv_driver);
 148
 149 MODULE_DESCRIPTION("GPIO IR Receiver driver");
 150 MODULE_LICENSE("GPL v2");