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 36static struct input_dev *input_dev; 37 38/* button handling code */ 39static 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 48static 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 71static 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 117static 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 133static 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 143static 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 159static void __exit atlas_acpi_exit(void) 160{ 161 acpi_bus_unregister_driver(&atlas_acpi_driver); 162} 163 164module_init(atlas_acpi_init); 165module_exit(atlas_acpi_exit); 166 167MODULE_AUTHOR("Jaya Kumar"); 168MODULE_LICENSE("GPL"); 169MODULE_DESCRIPTION("Atlas button driver"); 170