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

   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/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
  27 struct gpio_rc_dev {
  28         struct rc_dev *rcdev;
  29         struct gpio_desc *gpiod;
  30         int irq;
  31 };
  32
  33 static 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
  45 static 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                 /* Just try again if this happens */
  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
 109 static 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
 121 static 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
 133 static 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
 139 static const struct of_device_id gpio_ir_recv_of_match[] = {
 140         { .compatible = "gpio-ir-receiver", },
 141         { },
 142 };
 143 MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);
 144
 145 static 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 };
 155 module_platform_driver(gpio_ir_recv_driver);
 156
 157 MODULE_DESCRIPTION("GPIO IR Receiver driver");
 158 MODULE_LICENSE("GPL v2");