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.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 #include <linux/platform_data/media/gpio-ir-recv.h>
  25
  26 #define GPIO_IR_DRIVER_NAME     "gpio-rc-recv"
  27 #define GPIO_IR_DEVICE_NAME     "gpio_ir_recv"
  28
  29 struct gpio_rc_dev {
  30         struct rc_dev *rcdev;
  31         int gpio_nr;
  32         bool active_low;
  33         struct timer_list flush_timer;
  34 };
  35
  36 #ifdef CONFIG_OF
  37 /*
  38  * Translate OpenFirmware node properties into platform_data
  39  */
  40 static int gpio_ir_recv_get_devtree_pdata(struct device *dev,
  41                                   struct gpio_ir_recv_platform_data *pdata)
  42 {
  43         struct device_node *np = dev->of_node;
  44         enum of_gpio_flags flags;
  45         int gpio;
  46
  47         gpio = of_get_gpio_flags(np, 0, &flags);
  48         if (gpio < 0) {
  49                 if (gpio != -EPROBE_DEFER)
  50                         dev_err(dev, "Failed to get gpio flags (%d)\n", gpio);
  51                 return gpio;
  52         }
  53
  54         pdata->gpio_nr = gpio;
  55         pdata->active_low = (flags & OF_GPIO_ACTIVE_LOW);
  56         /* probe() takes care of map_name == NULL or allowed_protos == 0 */
  57         pdata->map_name = of_get_property(np, "linux,rc-map-name", NULL);
  58         pdata->allowed_protos = 0;
  59
  60         return 0;
  61 }
  62
  63 static const struct of_device_id gpio_ir_recv_of_match[] = {
  64         { .compatible = "gpio-ir-receiver", },
  65         { },
  66 };
  67 MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);
  68
  69 #else /* !CONFIG_OF */
  70
  71 #define gpio_ir_recv_get_devtree_pdata(dev, pdata)      (-ENOSYS)
  72
  73 #endif
  74
  75 static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
  76 {
  77         struct gpio_rc_dev *gpio_dev = dev_id;
  78         int gval;
  79         int rc = 0;
  80         enum raw_event_type type = IR_SPACE;
  81
  82         gval = gpio_get_value(gpio_dev->gpio_nr);
  83
  84         if (gval < 0)
  85                 goto err_get_value;
  86
  87         if (gpio_dev->active_low)
  88                 gval = !gval;
  89
  90         if (gval == 1)
  91                 type = IR_PULSE;
  92
  93         rc = ir_raw_event_store_edge(gpio_dev->rcdev, type);
  94         if (rc < 0)
  95                 goto err_get_value;
  96
  97         mod_timer(&gpio_dev->flush_timer,
  98                   jiffies + nsecs_to_jiffies(gpio_dev->rcdev->timeout));
  99
 100         ir_raw_event_handle(gpio_dev->rcdev);
 101
 102 err_get_value:
 103         return IRQ_HANDLED;
 104 }
 105
 106 static void flush_timer(unsigned long arg)
 107 {
 108         struct gpio_rc_dev *gpio_dev = (struct gpio_rc_dev *)arg;
 109         DEFINE_IR_RAW_EVENT(ev);
 110
 111         ev.timeout = true;
 112         ev.duration = gpio_dev->rcdev->timeout;
 113         ir_raw_event_store(gpio_dev->rcdev, &ev);
 114         ir_raw_event_handle(gpio_dev->rcdev);
 115 }
 116
 117 static int gpio_ir_recv_probe(struct platform_device *pdev)
 118 {
 119         struct gpio_rc_dev *gpio_dev;
 120         struct rc_dev *rcdev;
 121         const struct gpio_ir_recv_platform_data *pdata =
 122                                         pdev->dev.platform_data;
 123         int rc;
 124
 125         if (pdev->dev.of_node) {
 126                 struct gpio_ir_recv_platform_data *dtpdata =
 127                         devm_kzalloc(&pdev->dev, sizeof(*dtpdata), GFP_KERNEL);
 128                 if (!dtpdata)
 129                         return -ENOMEM;
 130                 rc = gpio_ir_recv_get_devtree_pdata(&pdev->dev, dtpdata);
 131                 if (rc)
 132                         return rc;
 133                 pdata = dtpdata;
 134         }
 135
 136         if (!pdata)
 137                 return -EINVAL;
 138
 139         if (pdata->gpio_nr < 0)
 140                 return -EINVAL;
 141
 142         gpio_dev = kzalloc(sizeof(struct gpio_rc_dev), GFP_KERNEL);
 143         if (!gpio_dev)
 144                 return -ENOMEM;
 145
 146         rcdev = rc_allocate_device();
 147         if (!rcdev) {
 148                 rc = -ENOMEM;
 149                 goto err_allocate_device;
 150         }
 151
 152         rcdev->priv = gpio_dev;
 153         rcdev->driver_type = RC_DRIVER_IR_RAW;
 154         rcdev->input_name = GPIO_IR_DEVICE_NAME;
 155         rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0";
 156         rcdev->input_id.bustype = BUS_HOST;
 157         rcdev->input_id.vendor = 0x0001;
 158         rcdev->input_id.product = 0x0001;
 159         rcdev->input_id.version = 0x0100;
 160         rcdev->dev.parent = &pdev->dev;
 161         rcdev->driver_name = GPIO_IR_DRIVER_NAME;
 162         rcdev->min_timeout = 0;
 163         rcdev->timeout = IR_DEFAULT_TIMEOUT;
 164         rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
 165         if (pdata->allowed_protos)
 166                 rcdev->allowed_protocols = pdata->allowed_protos;
 167         else
 168                 rcdev->allowed_protocols = RC_BIT_ALL;
 169         rcdev->map_name = pdata->map_name ?: RC_MAP_EMPTY;
 170
 171         gpio_dev->rcdev = rcdev;
 172         gpio_dev->gpio_nr = pdata->gpio_nr;
 173         gpio_dev->active_low = pdata->active_low;
 174
 175         setup_timer(&gpio_dev->flush_timer, flush_timer,
 176                     (unsigned long)gpio_dev);
 177
 178         rc = gpio_request(pdata->gpio_nr, "gpio-ir-recv");
 179         if (rc < 0)
 180                 goto err_gpio_request;
 181         rc  = gpio_direction_input(pdata->gpio_nr);
 182         if (rc < 0)
 183                 goto err_gpio_direction_input;
 184
 185         rc = rc_register_device(rcdev);
 186         if (rc < 0) {
 187                 dev_err(&pdev->dev, "failed to register rc device\n");
 188                 goto err_register_rc_device;
 189         }
 190
 191         platform_set_drvdata(pdev, gpio_dev);
 192
 193         rc = request_any_context_irq(gpio_to_irq(pdata->gpio_nr),
 194                                 gpio_ir_recv_irq,
 195                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 196                                         "gpio-ir-recv-irq", gpio_dev);
 197         if (rc < 0)
 198                 goto err_request_irq;
 199
 200         return 0;
 201
 202 err_request_irq:
 203         rc_unregister_device(rcdev);
 204         rcdev = NULL;
 205 err_register_rc_device:
 206 err_gpio_direction_input:
 207         gpio_free(pdata->gpio_nr);
 208 err_gpio_request:
 209         rc_free_device(rcdev);
 210 err_allocate_device:
 211         kfree(gpio_dev);
 212         return rc;
 213 }
 214
 215 static int gpio_ir_recv_remove(struct platform_device *pdev)
 216 {
 217         struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
 218
 219         free_irq(gpio_to_irq(gpio_dev->gpio_nr), gpio_dev);
 220         del_timer_sync(&gpio_dev->flush_timer);
 221         rc_unregister_device(gpio_dev->rcdev);
 222         gpio_free(gpio_dev->gpio_nr);
 223         kfree(gpio_dev);
 224         return 0;
 225 }
 226
 227 #ifdef CONFIG_PM
 228 static int gpio_ir_recv_suspend(struct device *dev)
 229 {
 230         struct platform_device *pdev = to_platform_device(dev);
 231         struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
 232
 233         if (device_may_wakeup(dev))
 234                 enable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
 235         else
 236                 disable_irq(gpio_to_irq(gpio_dev->gpio_nr));
 237
 238         return 0;
 239 }
 240
 241 static int gpio_ir_recv_resume(struct device *dev)
 242 {
 243         struct platform_device *pdev = to_platform_device(dev);
 244         struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
 245
 246         if (device_may_wakeup(dev))
 247                 disable_irq_wake(gpio_to_irq(gpio_dev->gpio_nr));
 248         else
 249                 enable_irq(gpio_to_irq(gpio_dev->gpio_nr));
 250
 251         return 0;
 252 }
 253
 254 static const struct dev_pm_ops gpio_ir_recv_pm_ops = {
 255         .suspend        = gpio_ir_recv_suspend,
 256         .resume         = gpio_ir_recv_resume,
 257 };
 258 #endif
 259
 260 static struct platform_driver gpio_ir_recv_driver = {
 261         .probe  = gpio_ir_recv_probe,
 262         .remove = gpio_ir_recv_remove,
 263         .driver = {
 264                 .name   = GPIO_IR_DRIVER_NAME,
 265                 .of_match_table = of_match_ptr(gpio_ir_recv_of_match),
 266 #ifdef CONFIG_PM
 267                 .pm     = &gpio_ir_recv_pm_ops,
 268 #endif
 269         },
 270 };
 271 module_platform_driver(gpio_ir_recv_driver);
 272
 273 MODULE_DESCRIPTION("GPIO IR Receiver driver");
 274 MODULE_LICENSE("GPL v2");