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 #define ACPI_ATLAS_BUTTON_HID           "ASIM0000"
  35
  36 static struct input_dev *input_dev;
  37
  38 /* button handling code */
  39 static acpi_status acpi_atlas_button_setup(acpi_handle region_handle,
  40                     u32 function, void *handler_context, void **return_context)
  41 {
  42         *return_context =
  43                 (function != ACPI_REGION_DEACTIVATE) ? handler_context : NULL;
  44
  45         return AE_OK;
  46 }
  47
  48 static acpi_status acpi_atlas_button_handler(u32 function,
  49                       acpi_physical_address address,
  50                       u32 bit_width, acpi_integer *value,
  51                       void *handler_context, void *region_context)
  52 {
  53         acpi_status status;
  54         int keycode;
  55
  56         if (function == ACPI_WRITE) {
  57                 keycode = KEY_F1 + (address & 0x0F);
  58                 input_report_key(input_dev, keycode, !(address & 0x10));
  59                 input_sync(input_dev);
  60                 status = 0;
  61         } else {
  62                 printk(KERN_WARNING "atlas: shrugged on unexpected function"
  63                         ":function=%x,address=%lx,value=%x\n",
  64                         function, (unsigned long)address, (u32)*value);
  65                 status = -EINVAL;
  66         }
  67
  68         return status;
  69 }
  70
  71 static int atlas_acpi_button_add(struct acpi_device *device)
  72 {
  73         acpi_status status;
  74         int err;
  75
  76         input_dev = input_allocate_device();
  77         if (!input_dev) {
  78                 printk(KERN_ERR "atlas: unable to allocate input device\n");
  79                 return -ENOMEM;
  80         }
  81
  82         input_dev->name = "Atlas ACPI button driver";
  83         input_dev->phys = "ASIM0000/atlas/input0";
  84         input_dev->id.bustype = BUS_HOST;
  85         input_dev->evbit[LONG(EV_KEY)] = BIT(EV_KEY);
  86
  87         set_bit(KEY_F1, input_dev->keybit);
  88         set_bit(KEY_F2, input_dev->keybit);
  89         set_bit(KEY_F3, input_dev->keybit);
  90         set_bit(KEY_F4, input_dev->keybit);
  91         set_bit(KEY_F5, input_dev->keybit);
  92         set_bit(KEY_F6, input_dev->keybit);
  93         set_bit(KEY_F7, input_dev->keybit);
  94         set_bit(KEY_F8, input_dev->keybit);
  95         set_bit(KEY_F9, input_dev->keybit);
  96
  97         err = input_register_device(input_dev);
  98         if (err) {
  99                 printk(KERN_ERR "atlas: couldn't register input device\n");
 100                 input_free_device(input_dev);
 101                 return err;
 102         }
 103
 104         /* hookup button handler */
 105         status = acpi_install_address_space_handler(device->handle,
 106                                 0x81, &acpi_atlas_button_handler,
 107                                 &acpi_atlas_button_setup, device);
 108         if (ACPI_FAILURE(status)) {
 109                 printk(KERN_ERR "Atlas: Error installing addr spc handler\n");
 110                 input_unregister_device(input_dev);
 111                 status = -EINVAL;
 112         }
 113
 114         return status;
 115 }
 116
 117 static int atlas_acpi_button_remove(struct acpi_device *device, int type)
 118 {
 119         acpi_status status;
 120
 121         status = acpi_remove_address_space_handler(device->handle,
 122                                 0x81, &acpi_atlas_button_handler);
 123         if (ACPI_FAILURE(status)) {
 124                 printk(KERN_ERR "Atlas: Error removing addr spc handler\n");
 125                 status = -EINVAL;
 126         }
 127
 128         input_unregister_device(input_dev);
 129
 130         return status;
 131 }
 132
 133 static struct acpi_driver atlas_acpi_driver = {
 134         .name   = ACPI_ATLAS_NAME,
 135         .class  = ACPI_ATLAS_CLASS,
 136         .ids    = ACPI_ATLAS_BUTTON_HID,
 137         .ops    = {
 138                 .add    = atlas_acpi_button_add,
 139                 .remove = atlas_acpi_button_remove,
 140         },
 141 };
 142
 143 static int __init atlas_acpi_init(void)
 144 {
 145         int result;
 146
 147         if (acpi_disabled)
 148                 return -ENODEV;
 149
 150         result = acpi_bus_register_driver(&atlas_acpi_driver);
 151         if (result < 0) {
 152                 printk(KERN_ERR "Atlas ACPI: Unable to register driver\n");
 153                 return -ENODEV;
 154         }
 155
 156         return 0;
 157 }
 158
 159 static void __exit atlas_acpi_exit(void)
 160 {
 161         acpi_bus_unregister_driver(&atlas_acpi_driver);
 162 }
 163
 164 module_init(atlas_acpi_init);
 165 module_exit(atlas_acpi_exit);
 166
 167 MODULE_AUTHOR("Jaya Kumar");
 168 MODULE_LICENSE("GPL");
 169 MODULE_DESCRIPTION("Atlas button driver");
 170