drivers/input/power.c

   1 /*
   2  * $Id: power.c,v 1.10 2001/09/25 09:17:15 vojtech Exp $
   3  *
   4  *  Copyright (c) 2001 "Crazy" James Simmons
   5  *
   6  *  Input driver Power Management.
   7  *
   8  *  Sponsored by Transvirtual Technology.
   9  */
  10
  11 /*
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25  *
  26  * Should you need to contact me, the author, you can do so by
  27  * e-mail - mail your message to <jsimmons@transvirtual.com>.
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/input.h>
  32 #include <linux/slab.h>
  33 #include <linux/init.h>
  34 #include <linux/tty.h>
  35 #include <linux/delay.h>
  36 #include <linux/pm.h>
  37
  38 static struct input_handler power_handler;
  39
  40 /*
  41  * Power management can't be done in a interrupt context. So we have to
  42  * use keventd.
  43  */
  44 static int suspend_button_pushed;
  45 static void suspend_button_task_handler(struct work_struct *work)
  46 {
  47         udelay(200); /* debounce */
  48         suspend_button_pushed = 0;
  49 }
  50
  51 static DECLARE_WORK(suspend_button_task, suspend_button_task_handler);
  52
  53 static void power_event(struct input_handle *handle, unsigned int type,
  54                         unsigned int code, int down)
  55 {
  56         struct input_dev *dev = handle->dev;
  57
  58         printk("Entering power_event\n");
  59
  60         if (type == EV_PWR) {
  61                 switch (code) {
  62                         case KEY_SUSPEND:
  63                                 printk("Powering down entire device\n");
  64
  65                                 if (!suspend_button_pushed) {
  66                                         suspend_button_pushed = 1;
  67                                         schedule_work(&suspend_button_task);
  68                                 }
  69                                 break;
  70                         case KEY_POWER:
  71                                 /* Hum power down the machine. */
  72                                 break;
  73                         default:
  74                                 return;
  75                 }
  76         }
  77
  78         if (type == EV_KEY) {
  79                 switch (code) {
  80                         case KEY_SUSPEND:
  81                                 printk("Powering down input device\n");
  82                                 /* This is risky. See pm.h for details. */
  83                                 if (dev->state != PM_RESUME)
  84                                         dev->state = PM_RESUME;
  85                                 else
  86                                         dev->state = PM_SUSPEND;
  87                                  /* pm_send(dev->pm_dev, dev->state, dev); */
  88                                 break;
  89                         case KEY_POWER:
  90                                 /* Turn the input device off completely ? */
  91                                 break;
  92                         default:
  93                                 return;
  94                 }
  95         }
  96         return;
  97 }
  98
  99 static int power_connect(struct input_handler *handler, struct input_dev *dev,
 100                          const struct input_device_id *id)
 101 {
 102         struct input_handle *handle;
 103         int error;
 104
 105         handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
 106         if (!handle)
 107                 return -ENOMEM;
 108
 109         handle->dev = dev;
 110         handle->handler = handler;
 111         handle->name = "power";
 112
 113         error = input_register_handle(handle);
 114         if (error)
 115                 goto err_free_handle;
 116
 117         error = input_open_device(handle);
 118         if (error)
 119                 goto err_unregister_handle;
 120
 121         return 0;
 122
 123  err_unregister_handle:
 124         input_unregister_handle(handle);
 125  err_free_handle:
 126         kfree(handle);
 127         return error;
 128 }
 129
 130 static void power_disconnect(struct input_handle *handle)
 131 {
 132         input_close_device(handle);
 133         input_unregister_handle(handle);
 134         kfree(handle);
 135 }
 136
 137 static const struct input_device_id power_ids[] = {
 138         {
 139                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 140                 .evbit = { BIT(EV_KEY) },
 141                 .keybit = { [LONG(KEY_SUSPEND)] = BIT(KEY_SUSPEND) }
 142         },
 143         {
 144                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 145                 .evbit = { BIT(EV_KEY) },
 146                 .keybit = { [LONG(KEY_POWER)] = BIT(KEY_POWER) }
 147         },
 148         {
 149                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
 150                 .evbit = { BIT(EV_PWR) },
 151         },
 152         { },    /* Terminating entry */
 153 };
 154
 155 MODULE_DEVICE_TABLE(input, power_ids);
 156
 157 static struct input_handler power_handler = {
 158         .event =        power_event,
 159         .connect =      power_connect,
 160         .disconnect =   power_disconnect,
 161         .name =         "power",
 162         .id_table =     power_ids,
 163 };
 164
 165 static int __init power_init(void)
 166 {
 167         return input_register_handler(&power_handler);
 168 }
 169
 170 static void __exit power_exit(void)
 171 {
 172         input_unregister_handler(&power_handler);
 173 }
 174
 175 module_init(power_init);
 176 module_exit(power_exit);
 177
 178 MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
 179 MODULE_DESCRIPTION("Input Power Management driver");
 180 MODULE_LICENSE("GPL");