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 unsigned short atlas_keymap[16]; 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 55 if (function == ACPI_WRITE) { 56 int code = address & 0x0f; 57 int key_down = !(address & 0x10); 58 59 input_event(input_dev, EV_MSC, MSC_SCAN, code); 60 input_report_key(input_dev, atlas_keymap[code], key_down); 61 input_sync(input_dev); 62 63 status = 0; 64 } else { 65 printk(KERN_WARNING "atlas: shrugged on unexpected function" 66 ":function=%x,address=%lx,value=%x\n", 67 function, (unsigned long)address, (u32)*value); 68 status = -EINVAL; 69 } 70 71 return status; 72 } 73 74 static int atlas_acpi_button_add(struct acpi_device *device) 75 { 76 acpi_status status; 77 int i; 78 int err; 79 80 input_dev = input_allocate_device(); 81 if (!input_dev) { 82 printk(KERN_ERR "atlas: unable to allocate input device\n"); 83 return -ENOMEM; 84 } 85 86 input_dev->name = "Atlas ACPI button driver"; 87 input_dev->phys = "ASIM0000/atlas/input0"; 88 input_dev->id.bustype = BUS_HOST; 89 input_dev->keycode = atlas_keymap; 90 input_dev->keycodesize = sizeof(unsigned short); 91 input_dev->keycodemax = ARRAY_SIZE(atlas_keymap); 92 93 input_set_capability(input_dev, EV_MSC, MSC_SCAN); 94 __set_bit(EV_KEY, input_dev->evbit); 95 for (i = 0; i < ARRAY_SIZE(atlas_keymap); i++) { 96 if (i < 9) { 97 atlas_keymap[i] = KEY_F1 + i; 98 __set_bit(KEY_F1 + i, input_dev->keybit); 99 } else 100 atlas_keymap[i] = KEY_RESERVED; 101 } 102 103 err = input_register_device(input_dev); 104 if (err) { 105 printk(KERN_ERR "atlas: couldn't register input device\n"); 106 input_free_device(input_dev); 107 return err; 108 } 109 110 /* hookup button handler */ 111 status = acpi_install_address_space_handler(device->handle, 112 0x81, &acpi_atlas_button_handler, 113 &acpi_atlas_button_setup, device); 114 if (ACPI_FAILURE(status)) { 115 printk(KERN_ERR "Atlas: Error installing addr spc handler\n"); 116 input_unregister_device(input_dev); 117 status = -EINVAL; 118 } 119 120 return status; 121 } 122 123 static int atlas_acpi_button_remove(struct acpi_device *device, int type) 124 { 125 acpi_status status; 126 127 status = acpi_remove_address_space_handler(device->handle, 128 0x81, &acpi_atlas_button_handler); 129 if (ACPI_FAILURE(status)) { 130 printk(KERN_ERR "Atlas: Error removing addr spc handler\n"); 131 status = -EINVAL; 132 } 133 134 input_unregister_device(input_dev); 135 136 return status; 137 } 138 139 static const struct acpi_device_id atlas_device_ids[] = { 140 {"ASIM0000", 0}, 141 {"", 0}, 142 }; 143 MODULE_DEVICE_TABLE(acpi, atlas_device_ids); 144 145 static struct acpi_driver atlas_acpi_driver = { 146 .name = ACPI_ATLAS_NAME, 147 .class = ACPI_ATLAS_CLASS, 148 .ids = atlas_device_ids, 149 .ops = { 150 .add = atlas_acpi_button_add, 151 .remove = atlas_acpi_button_remove, 152 }, 153 }; 154 155 static int __init atlas_acpi_init(void) 156 { 157 int result; 158 159 if (acpi_disabled) 160 return -ENODEV; 161 162 result = acpi_bus_register_driver(&atlas_acpi_driver); 163 if (result < 0) { 164 printk(KERN_ERR "Atlas ACPI: Unable to register driver\n"); 165 return -ENODEV; 166 } 167 168 return 0; 169 } 170 171 static void __exit atlas_acpi_exit(void) 172 { 173 acpi_bus_unregister_driver(&atlas_acpi_driver); 174 } 175 176 module_init(atlas_acpi_init); 177 module_exit(atlas_acpi_exit); 178 179 MODULE_AUTHOR("Jaya Kumar"); 180 MODULE_LICENSE("GPL"); 181 MODULE_DESCRIPTION("Atlas button driver"); 182 183