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