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[LONG(EV_KEY)] = BIT(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"); 175 176