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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 25 26#include <linux/kernel.h> 27#include <linux/module.h> 28#include <linux/init.h> 29#include <linux/input.h> 30#include <linux/types.h> 31#include <asm/uaccess.h> 32#include <acpi/acpi_drivers.h> 33 34#define ACPI_ATLAS_NAME "Atlas ACPI" 35#define ACPI_ATLAS_CLASS "Atlas" 36 37static unsigned short atlas_keymap[16]; 38static struct input_dev *input_dev; 39 40/* button handling code */ 41static acpi_status acpi_atlas_button_setup(acpi_handle region_handle, 42 u32 function, void *handler_context, void **return_context) 43{ 44 *return_context = 45 (function != ACPI_REGION_DEACTIVATE) ? handler_context : NULL; 46 47 return AE_OK; 48} 49 50static acpi_status acpi_atlas_button_handler(u32 function, 51 acpi_physical_address address, 52 u32 bit_width, u64 *value, 53 void *handler_context, void *region_context) 54{ 55 acpi_status status; 56 57 if (function == ACPI_WRITE) { 58 int code = address & 0x0f; 59 int key_down = !(address & 0x10); 60 61 input_event(input_dev, EV_MSC, MSC_SCAN, code); 62 input_report_key(input_dev, atlas_keymap[code], key_down); 63 input_sync(input_dev); 64 65 status = AE_OK; 66 } else { 67 pr_warn("shrugged on unexpected function: function=%x,address=%lx,value=%x\n", 68 function, (unsigned long)address, (u32)*value); 69 status = AE_BAD_PARAMETER; 70 } 71 72 return status; 73} 74 75static int atlas_acpi_button_add(struct acpi_device *device) 76{ 77 acpi_status status; 78 int i; 79 int err; 80 81 input_dev = input_allocate_device(); 82 if (!input_dev) { 83 pr_err("unable to allocate input device\n"); 84 return -ENOMEM; 85 } 86 87 input_dev->name = "Atlas ACPI button driver"; 88 input_dev->phys = "ASIM0000/atlas/input0"; 89 input_dev->id.bustype = BUS_HOST; 90 input_dev->keycode = atlas_keymap; 91 input_dev->keycodesize = sizeof(unsigned short); 92 input_dev->keycodemax = ARRAY_SIZE(atlas_keymap); 93 94 input_set_capability(input_dev, EV_MSC, MSC_SCAN); 95 __set_bit(EV_KEY, input_dev->evbit); 96 for (i = 0; i < ARRAY_SIZE(atlas_keymap); i++) { 97 if (i < 9) { 98 atlas_keymap[i] = KEY_F1 + i; 99 __set_bit(KEY_F1 + i, input_dev->keybit); 100 } else 101 atlas_keymap[i] = KEY_RESERVED; 102 } 103 104 err = input_register_device(input_dev); 105 if (err) { 106 pr_err("couldn't register input device\n"); 107 input_free_device(input_dev); 108 return err; 109 } 110 111 /* hookup button handler */ 112 status = acpi_install_address_space_handler(device->handle, 113 0x81, &acpi_atlas_button_handler, 114 &acpi_atlas_button_setup, device); 115 if (ACPI_FAILURE(status)) { 116 pr_err("error installing addr spc handler\n"); 117 input_unregister_device(input_dev); 118 err = -EINVAL; 119 } 120 121 return err; 122} 123 124static int atlas_acpi_button_remove(struct acpi_device *device, int type) 125{ 126 acpi_status status; 127 128 status = acpi_remove_address_space_handler(device->handle, 129 0x81, &acpi_atlas_button_handler); 130 if (ACPI_FAILURE(status)) 131 pr_err("error removing addr spc handler\n"); 132 133 input_unregister_device(input_dev); 134 135 return 0; 136} 137 138static const struct acpi_device_id atlas_device_ids[] = { 139 {"ASIM0000", 0}, 140 {"", 0}, 141}; 142MODULE_DEVICE_TABLE(acpi, atlas_device_ids); 143 144static struct acpi_driver atlas_acpi_driver = { 145 .name = ACPI_ATLAS_NAME, 146 .class = ACPI_ATLAS_CLASS, 147 .owner = THIS_MODULE, 148 .ids = atlas_device_ids, 149 .ops = { 150 .add = atlas_acpi_button_add, 151 .remove = atlas_acpi_button_remove, 152 }, 153}; 154 155static int __init atlas_acpi_init(void) 156{ 157 if (acpi_disabled) 158 return -ENODEV; 159 160 return acpi_bus_register_driver(&atlas_acpi_driver); 161} 162 163static void __exit atlas_acpi_exit(void) 164{ 165 acpi_bus_unregister_driver(&atlas_acpi_driver); 166} 167 168module_init(atlas_acpi_init); 169module_exit(atlas_acpi_exit); 170 171MODULE_AUTHOR("Jaya Kumar"); 172MODULE_LICENSE("GPL"); 173MODULE_DESCRIPTION("Atlas button driver"); 174