drivers/input/apm-power.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Input Power Event -> APM Bridge
   4  *
   5  *  Copyright (c) 2007 Richard Purdie
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/module.h>
  11 #include <linux/input.h>
  12 #include <linux/slab.h>
  13 #include <linux/init.h>
  14 #include <linux/tty.h>
  15 #include <linux/delay.h>
  16 #include <linux/pm.h>
  17 #include <linux/apm-emulation.h>
  18
  19 static void system_power_event(unsigned int keycode)
  20 {
  21         switch (keycode) {
  22         case KEY_SUSPEND:
  23                 apm_queue_event(APM_USER_SUSPEND);
  24                 pr_info("Requesting system suspend...\n");
  25                 break;
  26         default:
  27                 break;
  28         }
  29 }
  30
  31 static void apmpower_event(struct input_handle *handle, unsigned int type,
  32                            unsigned int code, int value)
  33 {
  34         /* only react on key down events */
  35         if (value != 1)
  36                 return;
  37
  38         switch (type) {
  39         case EV_PWR:
  40                 system_power_event(code);
  41                 break;
  42
  43         default:
  44                 break;
  45         }
  46 }
  47
  48 static int apmpower_connect(struct input_handler *handler,
  49                                           struct input_dev *dev,
  50                                           const struct input_device_id *id)
  51 {
  52         struct input_handle *handle;
  53         int error;
  54
  55         handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
  56         if (!handle)
  57                 return -ENOMEM;
  58
  59         handle->dev = dev;
  60         handle->handler = handler;
  61         handle->name = "apm-power";
  62
  63         error = input_register_handle(handle);
  64         if (error) {
  65                 pr_err("Failed to register input power handler, error %d\n",
  66                        error);
  67                 kfree(handle);
  68                 return error;
  69         }
  70
  71         error = input_open_device(handle);
  72         if (error) {
  73                 pr_err("Failed to open input power device, error %d\n", error);
  74                 input_unregister_handle(handle);
  75                 kfree(handle);
  76                 return error;
  77         }
  78
  79         return 0;
  80 }
  81
  82 static void apmpower_disconnect(struct input_handle *handle)
  83 {
  84         input_close_device(handle);
  85         input_unregister_handle(handle);
  86         kfree(handle);
  87 }
  88
  89 static const struct input_device_id apmpower_ids[] = {
  90         {
  91                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
  92                 .evbit = { BIT_MASK(EV_PWR) },
  93         },
  94         { },
  95 };
  96
  97 MODULE_DEVICE_TABLE(input, apmpower_ids);
  98
  99 static struct input_handler apmpower_handler = {
 100         .event =        apmpower_event,
 101         .connect =      apmpower_connect,
 102         .disconnect =   apmpower_disconnect,
 103         .name =         "apm-power",
 104         .id_table =     apmpower_ids,
 105 };
 106
 107 static int __init apmpower_init(void)
 108 {
 109         return input_register_handler(&apmpower_handler);
 110 }
 111
 112 static void __exit apmpower_exit(void)
 113 {
 114         input_unregister_handler(&apmpower_handler);
 115 }
 116
 117 module_init(apmpower_init);
 118 module_exit(apmpower_exit);
 119
 120 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
 121 MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
 122 MODULE_LICENSE("GPL");