drivers/input/misc/atlas_btns.c

   1 /*
   2  *  atlas_btns.c - Atlas Wallmount Touchscreen ACPI Extras
   3  *
   4  *  Copyright (C) 2006 Jaya Kumar
   5  *  Based on Toshiba ACPI by John Belmonte and ASUS ACPI
   6  *  This work was sponsored by CIS(M) Sdn Bhd.
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/input.h>
  28 #include <linux/types.h>
  29 #include <asm/uaccess.h>
  30 #include <acpi/acpi_drivers.h>
  31
  32 #define ACPI_ATLAS_NAME                 "Atlas ACPI"
  33 #define ACPI_ATLAS_CLASS                "Atlas"
  34
  35 static struct input_dev *input_dev;
  36
  37 /* button handling code */
  38 static acpi_status acpi_atlas_button_setup(acpi_handle region_handle,
  39                     u32 function, void *handler_context, void **return_context)
  40 {
  41         *return_context =
  42                 (function != ACPI_REGION_DEACTIVATE) ? handler_context : NULL;
  43
  44         return AE_OK;
  45 }
  46
  47 static acpi_status acpi_atlas_button_handler(u32 function,
  48                       acpi_physical_address address,
  49                       u32 bit_width, acpi_integer *value,
  50                       void *handler_context, void *region_context)
  51 {
  52         acpi_status status;
  53         int keycode;
  54
  55         if (function == ACPI_WRITE) {
  56                 keycode = KEY_F1 + (address & 0x0F);
  57                 input_report_key(input_dev, keycode, !(address & 0x10));
  58                 input_sync(input_dev);
  59                 status = 0;
  60         } else {
  61                 printk(KERN_WARNING "atlas: shrugged on unexpected function"
  62                         ":function=%x,address=%lx,value=%x\n",
  63                         function, (unsigned long)address, (u32)*value);
  64                 status = -EINVAL;
  65         }
  66
  67         return status;
  68 }
  69
  70 static int atlas_acpi_button_add(struct acpi_device *device)
  71 {
  72         acpi_status status;
  73         int err;
  74
  75         input_dev = input_allocate_device();
  76         if (!input_dev) {
  77                 printk(KERN_ERR "atlas: unable to allocate input device\n");
  78                 return -ENOMEM;
  79         }
  80
  81         input_dev->name = "Atlas ACPI button driver";
  82         input_dev->phys = "ASIM0000/atlas/input0";
  83         input_dev->id.bustype = BUS_HOST;
  84         input_dev->evbit[BIT_WORD(EV_KEY)] = BIT_MASK(EV_KEY);
  85
  86         set_bit(KEY_F1, input_dev->keybit);
  87         set_bit(KEY_F2, input_dev->keybit);
  88         set_bit(KEY_F3, input_dev->keybit);
  89         set_bit(KEY_F4, input_dev->keybit);
  90         set_bit(KEY_F5, input_dev->keybit);
  91         set_bit(KEY_F6, input_dev->keybit);
  92         set_bit(KEY_F7, input_dev->keybit);
  93         set_bit(KEY_F8, input_dev->keybit);
  94         set_bit(KEY_F9, input_dev->keybit);
  95
  96         err = input_register_device(input_dev);
  97         if (err) {
  98                 printk(KERN_ERR "atlas: couldn't register input device\n");
  99                 input_free_device(input_dev);
 100                 return err;
 101         }
 102
 103         /* hookup button handler */
 104         status = acpi_install_address_space_handler(device->handle,
 105                                 0x81, &acpi_atlas_button_handler,
 106                                 &acpi_atlas_button_setup, device);
 107         if (ACPI_FAILURE(status)) {
 108                 printk(KERN_ERR "Atlas: Error installing addr spc handler\n");
 109                 input_unregister_device(input_dev);
 110                 status = -EINVAL;
 111         }
 112
 113         return status;
 114 }
 115
 116 static int atlas_acpi_button_remove(struct acpi_device *device, int type)
 117 {
 118         acpi_status status;
 119
 120         status = acpi_remove_address_space_handler(device->handle,
 121                                 0x81, &acpi_atlas_button_handler);
 122         if (ACPI_FAILURE(status)) {
 123                 printk(KERN_ERR "Atlas: Error removing addr spc handler\n");
 124                 status = -EINVAL;
 125         }
 126
 127         input_unregister_device(input_dev);
 128
 129         return status;
 130 }
 131
 132 static const struct acpi_device_id atlas_device_ids[] = {
 133         {"ASIM0000", 0},
 134         {"", 0},
 135 };
 136 MODULE_DEVICE_TABLE(acpi, atlas_device_ids);
 137
 138 static struct acpi_driver atlas_acpi_driver = {
 139         .name   = ACPI_ATLAS_NAME,
 140         .class  = ACPI_ATLAS_CLASS,
 141         .ids    = atlas_device_ids,
 142         .ops    = {
 143                 .add    = atlas_acpi_button_add,
 144                 .remove = atlas_acpi_button_remove,
 145         },
 146 };
 147
 148 static int __init atlas_acpi_init(void)
 149 {
 150         int result;
 151
 152         if (acpi_disabled)
 153                 return -ENODEV;
 154
 155         result = acpi_bus_register_driver(&atlas_acpi_driver);
 156         if (result < 0) {
 157                 printk(KERN_ERR "Atlas ACPI: Unable to register driver\n");
 158                 return -ENODEV;
 159         }
 160
 161         return 0;
 162 }
 163
 164 static void __exit atlas_acpi_exit(void)
 165 {
 166         acpi_bus_unregister_driver(&atlas_acpi_driver);
 167 }
 168
 169 module_init(atlas_acpi_init);
 170 module_exit(atlas_acpi_exit);
 171
 172 MODULE_AUTHOR("Jaya Kumar");
 173 MODULE_LICENSE("GPL");
 174 MODULE_DESCRIPTION("Atlas button driver");
 175