drivers/input/misc/pcf50633-input.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* NXP PCF50633 Input Driver
   3  *
   4  * (C) 2006-2008 by Openmoko, Inc.
   5  * Author: Balaji Rao <balajirrao@openmoko.org>
   6  * All rights reserved.
   7  *
   8  * Broken down from monstrous PCF50633 driver mainly by
   9  * Harald Welte, Andy Green and Werner Almesberger
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/device.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/input.h>
  17 #include <linux/slab.h>
  18
  19 #include <linux/mfd/pcf50633/core.h>
  20
  21 #define PCF50633_OOCSTAT_ONKEY  0x01
  22 #define PCF50633_REG_OOCSTAT    0x12
  23 #define PCF50633_REG_OOCMODE    0x10
  24
  25 struct pcf50633_input {
  26         struct pcf50633 *pcf;
  27         struct input_dev *input_dev;
  28 };
  29
  30 static void
  31 pcf50633_input_irq(int irq, void *data)
  32 {
  33         struct pcf50633_input *input;
  34         int onkey_released;
  35
  36         input = data;
  37
  38         /* We report only one event depending on the key press status */
  39         onkey_released = pcf50633_reg_read(input->pcf, PCF50633_REG_OOCSTAT)
  40                                                 & PCF50633_OOCSTAT_ONKEY;
  41
  42         if (irq == PCF50633_IRQ_ONKEYF && !onkey_released)
  43                 input_report_key(input->input_dev, KEY_POWER, 1);
  44         else if (irq == PCF50633_IRQ_ONKEYR && onkey_released)
  45                 input_report_key(input->input_dev, KEY_POWER, 0);
  46
  47         input_sync(input->input_dev);
  48 }
  49
  50 static int pcf50633_input_probe(struct platform_device *pdev)
  51 {
  52         struct pcf50633_input *input;
  53         struct input_dev *input_dev;
  54         int ret;
  55
  56
  57         input = kzalloc(sizeof(*input), GFP_KERNEL);
  58         if (!input)
  59                 return -ENOMEM;
  60
  61         input_dev = input_allocate_device();
  62         if (!input_dev) {
  63                 kfree(input);
  64                 return -ENOMEM;
  65         }
  66
  67         platform_set_drvdata(pdev, input);
  68         input->pcf = dev_to_pcf50633(pdev->dev.parent);
  69         input->input_dev = input_dev;
  70
  71         input_dev->name = "PCF50633 PMU events";
  72         input_dev->id.bustype = BUS_I2C;
  73         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_PWR);
  74         set_bit(KEY_POWER, input_dev->keybit);
  75
  76         ret = input_register_device(input_dev);
  77         if (ret) {
  78                 input_free_device(input_dev);
  79                 kfree(input);
  80                 return ret;
  81         }
  82         pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYR,
  83                                 pcf50633_input_irq, input);
  84         pcf50633_register_irq(input->pcf, PCF50633_IRQ_ONKEYF,
  85                                 pcf50633_input_irq, input);
  86
  87         return 0;
  88 }
  89
  90 static int pcf50633_input_remove(struct platform_device *pdev)
  91 {
  92         struct pcf50633_input *input  = platform_get_drvdata(pdev);
  93
  94         pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYR);
  95         pcf50633_free_irq(input->pcf, PCF50633_IRQ_ONKEYF);
  96
  97         input_unregister_device(input->input_dev);
  98         kfree(input);
  99
 100         return 0;
 101 }
 102
 103 static struct platform_driver pcf50633_input_driver = {
 104         .driver = {
 105                 .name = "pcf50633-input",
 106         },
 107         .probe = pcf50633_input_probe,
 108         .remove = pcf50633_input_remove,
 109 };
 110 module_platform_driver(pcf50633_input_driver);
 111
 112 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 113 MODULE_DESCRIPTION("PCF50633 input driver");
 114 MODULE_LICENSE("GPL");
 115 MODULE_ALIAS("platform:pcf50633-input");