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Linux/drivers/input/apm-power.c

  1 /*
  2  *  Input Power Event -> APM Bridge
  3  *
  4  *  Copyright (c) 2007 Richard Purdie
  5  *
  6  *  This program is free software; you can redistribute it and/or modify
  7  *  it under the terms of the GNU General Public License version 2 as
  8  *  published by the Free Software Foundation.
  9  *
 10  */
 11 
 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 13 
 14 #include <linux/module.h>
 15 #include <linux/input.h>
 16 #include <linux/slab.h>
 17 #include <linux/init.h>
 18 #include <linux/tty.h>
 19 #include <linux/delay.h>
 20 #include <linux/pm.h>
 21 #include <linux/apm-emulation.h>
 22 
 23 static void system_power_event(unsigned int keycode)
 24 {
 25         switch (keycode) {
 26         case KEY_SUSPEND:
 27                 apm_queue_event(APM_USER_SUSPEND);
 28                 pr_info("Requesting system suspend...\n");
 29                 break;
 30         default:
 31                 break;
 32         }
 33 }
 34 
 35 static void apmpower_event(struct input_handle *handle, unsigned int type,
 36                            unsigned int code, int value)
 37 {
 38         /* only react on key down events */
 39         if (value != 1)
 40                 return;
 41 
 42         switch (type) {
 43         case EV_PWR:
 44                 system_power_event(code);
 45                 break;
 46 
 47         default:
 48                 break;
 49         }
 50 }
 51 
 52 static int apmpower_connect(struct input_handler *handler,
 53                                           struct input_dev *dev,
 54                                           const struct input_device_id *id)
 55 {
 56         struct input_handle *handle;
 57         int error;
 58 
 59         handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
 60         if (!handle)
 61                 return -ENOMEM;
 62 
 63         handle->dev = dev;
 64         handle->handler = handler;
 65         handle->name = "apm-power";
 66 
 67         error = input_register_handle(handle);
 68         if (error) {
 69                 pr_err("Failed to register input power handler, error %d\n",
 70                        error);
 71                 kfree(handle);
 72                 return error;
 73         }
 74 
 75         error = input_open_device(handle);
 76         if (error) {
 77                 pr_err("Failed to open input power device, error %d\n", error);
 78                 input_unregister_handle(handle);
 79                 kfree(handle);
 80                 return error;
 81         }
 82 
 83         return 0;
 84 }
 85 
 86 static void apmpower_disconnect(struct input_handle *handle)
 87 {
 88         input_close_device(handle);
 89         input_unregister_handle(handle);
 90         kfree(handle);
 91 }
 92 
 93 static const struct input_device_id apmpower_ids[] = {
 94         {
 95                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
 96                 .evbit = { BIT_MASK(EV_PWR) },
 97         },
 98         { },
 99 };
100 
101 MODULE_DEVICE_TABLE(input, apmpower_ids);
102 
103 static struct input_handler apmpower_handler = {
104         .event =        apmpower_event,
105         .connect =      apmpower_connect,
106         .disconnect =   apmpower_disconnect,
107         .name =         "apm-power",
108         .id_table =     apmpower_ids,
109 };
110 
111 static int __init apmpower_init(void)
112 {
113         return input_register_handler(&apmpower_handler);
114 }
115 
116 static void __exit apmpower_exit(void)
117 {
118         input_unregister_handler(&apmpower_handler);
119 }
120 
121 module_init(apmpower_init);
122 module_exit(apmpower_exit);
123 
124 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
125 MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
126 MODULE_LICENSE("GPL");
127 

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