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/platform_device.h>
  13 #include <linux/pm_runtime.h>
  14 #include <linux/pm_qos.h>
  15 #include <linux/irq.h>
  16 #include <media/rc-core.h>
  17
  18 #define GPIO_IR_DEVICE_NAME     "gpio_ir_recv"
  19
  20 struct gpio_rc_dev {
  21         struct rc_dev *rcdev;
  22         struct gpio_desc *gpiod;
  23         int irq;
  24         struct device *pmdev;
  25         struct pm_qos_request qos;
  26 };
  27
  28 static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
  29 {
  30         int val;
  31         struct gpio_rc_dev *gpio_dev = dev_id;
  32         struct device *pmdev = gpio_dev->pmdev;
  33
  34         /*
  35          * For some cpuidle systems, not all:
  36          * Respond to interrupt taking more latency when cpu in idle.
  37          * Invoke asynchronous pm runtime get from interrupt context,
  38          * this may introduce a millisecond delay to call resume callback,
  39          * where to disable cpuilde.
  40          *
  41          * Two issues lead to fail to decode first frame, one is latency to
  42          * respond to interrupt, another is delay introduced by async api.
  43          */
  44         if (pmdev)
  45                 pm_runtime_get(pmdev);
  46
  47         val = gpiod_get_value(gpio_dev->gpiod);
  48         if (val >= 0)
  49                 ir_raw_event_store_edge(gpio_dev->rcdev, val == 1);
  50
  51         if (pmdev) {
  52                 pm_runtime_mark_last_busy(pmdev);
  53                 pm_runtime_put_autosuspend(pmdev);
  54         }
  55
  56         return IRQ_HANDLED;
  57 }
  58
  59 static int gpio_ir_recv_probe(struct platform_device *pdev)
  60 {
  61         struct device *dev = &pdev->dev;
  62         struct device_node *np = dev->of_node;
  63         struct gpio_rc_dev *gpio_dev;
  64         struct rc_dev *rcdev;
  65         u32 period = 0;
  66         int rc;
  67
  68         if (!np)
  69                 return -ENODEV;
  70
  71         gpio_dev = devm_kzalloc(dev, sizeof(*gpio_dev), GFP_KERNEL);
  72         if (!gpio_dev)
  73                 return -ENOMEM;
  74
  75         gpio_dev->gpiod = devm_gpiod_get(dev, NULL, GPIOD_IN);
  76         if (IS_ERR(gpio_dev->gpiod))
  77                 return dev_err_probe(dev, PTR_ERR(gpio_dev->gpiod),
  78                                      "error getting gpio\n");
  79         gpio_dev->irq = gpiod_to_irq(gpio_dev->gpiod);
  80         if (gpio_dev->irq < 0)
  81                 return gpio_dev->irq;
  82
  83         rcdev = devm_rc_allocate_device(dev, RC_DRIVER_IR_RAW);
  84         if (!rcdev)
  85                 return -ENOMEM;
  86
  87         rcdev->priv = gpio_dev;
  88         rcdev->device_name = GPIO_IR_DEVICE_NAME;
  89         rcdev->input_phys = GPIO_IR_DEVICE_NAME "/input0";
  90         rcdev->input_id.bustype = BUS_HOST;
  91         rcdev->input_id.vendor = 0x0001;
  92         rcdev->input_id.product = 0x0001;
  93         rcdev->input_id.version = 0x0100;
  94         rcdev->dev.parent = dev;
  95         rcdev->driver_name = KBUILD_MODNAME;
  96         rcdev->min_timeout = 1;
  97         rcdev->timeout = IR_DEFAULT_TIMEOUT;
  98         rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
  99         rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
 100         rcdev->map_name = of_get_property(np, "linux,rc-map-name", NULL);
 101         if (!rcdev->map_name)
 102                 rcdev->map_name = RC_MAP_EMPTY;
 103
 104         gpio_dev->rcdev = rcdev;
 105         if (of_property_read_bool(np, "wakeup-source"))
 106                 device_init_wakeup(dev, true);
 107
 108         rc = devm_rc_register_device(dev, rcdev);
 109         if (rc < 0) {
 110                 dev_err(dev, "failed to register rc device (%d)\n", rc);
 111                 return rc;
 112         }
 113
 114         of_property_read_u32(np, "linux,autosuspend-period", &period);
 115         if (period) {
 116                 gpio_dev->pmdev = dev;
 117                 pm_runtime_set_autosuspend_delay(dev, period);
 118                 pm_runtime_use_autosuspend(dev);
 119                 pm_runtime_set_suspended(dev);
 120                 pm_runtime_enable(dev);
 121         }
 122
 123         platform_set_drvdata(pdev, gpio_dev);
 124
 125         return devm_request_irq(dev, gpio_dev->irq, gpio_ir_recv_irq,
 126                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 127                                 "gpio-ir-recv-irq", gpio_dev);
 128 }
 129
 130 static void gpio_ir_recv_remove(struct platform_device *pdev)
 131 {
 132         struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
 133         struct device *pmdev = gpio_dev->pmdev;
 134
 135         if (pmdev) {
 136                 pm_runtime_get_sync(pmdev);
 137                 cpu_latency_qos_remove_request(&gpio_dev->qos);
 138
 139                 pm_runtime_disable(pmdev);
 140                 pm_runtime_put_noidle(pmdev);
 141                 pm_runtime_set_suspended(pmdev);
 142         }
 143 }
 144
 145 #ifdef CONFIG_PM
 146 static int gpio_ir_recv_suspend(struct device *dev)
 147 {
 148         struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
 149
 150         if (device_may_wakeup(dev))
 151                 enable_irq_wake(gpio_dev->irq);
 152         else
 153                 disable_irq(gpio_dev->irq);
 154
 155         return 0;
 156 }
 157
 158 static int gpio_ir_recv_resume(struct device *dev)
 159 {
 160         struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
 161
 162         if (device_may_wakeup(dev))
 163                 disable_irq_wake(gpio_dev->irq);
 164         else
 165                 enable_irq(gpio_dev->irq);
 166
 167         return 0;
 168 }
 169
 170 static int gpio_ir_recv_runtime_suspend(struct device *dev)
 171 {
 172         struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
 173
 174         cpu_latency_qos_remove_request(&gpio_dev->qos);
 175
 176         return 0;
 177 }
 178
 179 static int gpio_ir_recv_runtime_resume(struct device *dev)
 180 {
 181         struct gpio_rc_dev *gpio_dev = dev_get_drvdata(dev);
 182
 183         cpu_latency_qos_add_request(&gpio_dev->qos, 0);
 184
 185         return 0;
 186 }
 187
 188 static const struct dev_pm_ops gpio_ir_recv_pm_ops = {
 189         .suspend        = gpio_ir_recv_suspend,
 190         .resume         = gpio_ir_recv_resume,
 191         .runtime_suspend = gpio_ir_recv_runtime_suspend,
 192         .runtime_resume  = gpio_ir_recv_runtime_resume,
 193 };
 194 #endif
 195
 196 static const struct of_device_id gpio_ir_recv_of_match[] = {
 197         { .compatible = "gpio-ir-receiver", },
 198         { },
 199 };
 200 MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);
 201
 202 static struct platform_driver gpio_ir_recv_driver = {
 203         .probe  = gpio_ir_recv_probe,
 204         .remove = gpio_ir_recv_remove,
 205         .driver = {
 206                 .name   = KBUILD_MODNAME,
 207                 .of_match_table = gpio_ir_recv_of_match,
 208 #ifdef CONFIG_PM
 209                 .pm     = &gpio_ir_recv_pm_ops,
 210 #endif
 211         },
 212 };
 213 module_platform_driver(gpio_ir_recv_driver);
 214
 215 MODULE_DESCRIPTION("GPIO IR Receiver driver");
 216 MODULE_LICENSE("GPL v2");