drivers/input/misc/rt5120-pwrkey.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2022 Richtek Technology Corp.
   4  * Author: ChiYuan Huang <cy_huang@richtek.com>
   5  */
   6
   7 #include <linux/bits.h>
   8 #include <linux/input.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/mod_devicetable.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/regmap.h>
  15
  16 #define RT5120_REG_INTSTAT      0x1E
  17 #define RT5120_PWRKEYSTAT_MASK  BIT(7)
  18
  19 struct rt5120_priv {
  20         struct regmap *regmap;
  21         struct input_dev *input;
  22 };
  23
  24 static irqreturn_t rt5120_pwrkey_handler(int irq, void *devid)
  25 {
  26         struct rt5120_priv *priv = devid;
  27         unsigned int stat;
  28         int error;
  29
  30         error = regmap_read(priv->regmap, RT5120_REG_INTSTAT, &stat);
  31         if (error)
  32                 return IRQ_NONE;
  33
  34         input_report_key(priv->input, KEY_POWER,
  35                          !(stat & RT5120_PWRKEYSTAT_MASK));
  36         input_sync(priv->input);
  37
  38         return IRQ_HANDLED;
  39 }
  40
  41 static int rt5120_pwrkey_probe(struct platform_device *pdev)
  42 {
  43         struct rt5120_priv *priv;
  44         struct device *dev = &pdev->dev;
  45         int press_irq, release_irq;
  46         int error;
  47
  48         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  49         if (!priv)
  50                 return -ENOMEM;
  51
  52         priv->regmap = dev_get_regmap(dev->parent, NULL);
  53         if (!priv->regmap) {
  54                 dev_err(dev, "Failed to init regmap\n");
  55                 return -ENODEV;
  56         }
  57
  58         press_irq = platform_get_irq_byname(pdev, "pwrkey-press");
  59         if (press_irq < 0)
  60                 return press_irq;
  61
  62         release_irq = platform_get_irq_byname(pdev, "pwrkey-release");
  63         if (release_irq < 0)
  64                 return release_irq;
  65
  66         /* Make input device be device resource managed */
  67         priv->input = devm_input_allocate_device(dev);
  68         if (!priv->input)
  69                 return -ENOMEM;
  70
  71         priv->input->name = "rt5120_pwrkey";
  72         priv->input->phys = "rt5120_pwrkey/input0";
  73         priv->input->id.bustype = BUS_I2C;
  74         input_set_capability(priv->input, EV_KEY, KEY_POWER);
  75
  76         error = input_register_device(priv->input);
  77         if (error) {
  78                 dev_err(dev, "Failed to register input device: %d\n", error);
  79                 return error;
  80         }
  81
  82         error = devm_request_threaded_irq(dev, press_irq,
  83                                           NULL, rt5120_pwrkey_handler,
  84                                           0, "pwrkey-press", priv);
  85         if (error) {
  86                 dev_err(dev,
  87                         "Failed to register pwrkey press irq: %d\n", error);
  88                 return error;
  89         }
  90
  91         error = devm_request_threaded_irq(dev, release_irq,
  92                                           NULL, rt5120_pwrkey_handler,
  93                                           0, "pwrkey-release", priv);
  94         if (error) {
  95                 dev_err(dev,
  96                         "Failed to register pwrkey release irq: %d\n", error);
  97                 return error;
  98         }
  99
 100         return 0;
 101 }
 102
 103 static const struct of_device_id r5120_pwrkey_match_table[] = {
 104         { .compatible = "richtek,rt5120-pwrkey" },
 105         {}
 106 };
 107 MODULE_DEVICE_TABLE(of, r5120_pwrkey_match_table);
 108
 109 static struct platform_driver rt5120_pwrkey_driver = {
 110         .driver = {
 111                 .name = "rt5120-pwrkey",
 112                 .of_match_table = r5120_pwrkey_match_table,
 113         },
 114         .probe = rt5120_pwrkey_probe,
 115 };
 116 module_platform_driver(rt5120_pwrkey_driver);
 117
 118 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
 119 MODULE_DESCRIPTION("Richtek RT5120 power key driver");
 120 MODULE_LICENSE("GPL");