drivers/input/misc/rk805-pwrkey.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Rockchip RK805 PMIC Power Key driver
   4  *
   5  * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
   6  *
   7  * Author: Joseph Chen <chenjh@rock-chips.com>
   8  */
   9
  10 #include <linux/errno.h>
  11 #include <linux/init.h>
  12 #include <linux/input.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17
  18 static irqreturn_t pwrkey_fall_irq(int irq, void *_pwr)
  19 {
  20         struct input_dev *pwr = _pwr;
  21
  22         input_report_key(pwr, KEY_POWER, 1);
  23         input_sync(pwr);
  24
  25         return IRQ_HANDLED;
  26 }
  27
  28 static irqreturn_t pwrkey_rise_irq(int irq, void *_pwr)
  29 {
  30         struct input_dev *pwr = _pwr;
  31
  32         input_report_key(pwr, KEY_POWER, 0);
  33         input_sync(pwr);
  34
  35         return IRQ_HANDLED;
  36 }
  37
  38 static int rk805_pwrkey_probe(struct platform_device *pdev)
  39 {
  40         struct input_dev *pwr;
  41         int fall_irq, rise_irq;
  42         int err;
  43
  44         pwr = devm_input_allocate_device(&pdev->dev);
  45         if (!pwr) {
  46                 dev_err(&pdev->dev, "Can't allocate power button\n");
  47                 return -ENOMEM;
  48         }
  49
  50         pwr->name = "rk805 pwrkey";
  51         pwr->phys = "rk805_pwrkey/input0";
  52         pwr->id.bustype = BUS_HOST;
  53         input_set_capability(pwr, EV_KEY, KEY_POWER);
  54
  55         fall_irq = platform_get_irq(pdev, 0);
  56         if (fall_irq < 0)
  57                 return fall_irq;
  58
  59         rise_irq = platform_get_irq(pdev, 1);
  60         if (rise_irq < 0)
  61                 return rise_irq;
  62
  63         err = devm_request_any_context_irq(&pwr->dev, fall_irq,
  64                                            pwrkey_fall_irq,
  65                                            IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
  66                                            "rk805_pwrkey_fall", pwr);
  67         if (err < 0) {
  68                 dev_err(&pdev->dev, "Can't register fall irq: %d\n", err);
  69                 return err;
  70         }
  71
  72         err = devm_request_any_context_irq(&pwr->dev, rise_irq,
  73                                            pwrkey_rise_irq,
  74                                            IRQF_TRIGGER_RISING | IRQF_ONESHOT,
  75                                            "rk805_pwrkey_rise", pwr);
  76         if (err < 0) {
  77                 dev_err(&pdev->dev, "Can't register rise irq: %d\n", err);
  78                 return err;
  79         }
  80
  81         err = input_register_device(pwr);
  82         if (err) {
  83                 dev_err(&pdev->dev, "Can't register power button: %d\n", err);
  84                 return err;
  85         }
  86
  87         platform_set_drvdata(pdev, pwr);
  88         device_init_wakeup(&pdev->dev, true);
  89
  90         return 0;
  91 }
  92
  93 static struct platform_driver rk805_pwrkey_driver = {
  94         .probe  = rk805_pwrkey_probe,
  95         .driver = {
  96                 .name = "rk805-pwrkey",
  97         },
  98 };
  99 module_platform_driver(rk805_pwrkey_driver);
 100
 101 MODULE_AUTHOR("Joseph Chen <chenjh@rock-chips.com>");
 102 MODULE_DESCRIPTION("RK805 PMIC Power Key driver");
 103 MODULE_LICENSE("GPL");