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/input.h> 29 #include <linux/types.h> 30 #include <linux/acpi.h> 31 #include <linux/uaccess.h> 32 33 #define ACPI_ATLAS_NAME "Atlas ACPI" 34 #define ACPI_ATLAS_CLASS "Atlas" 35 36 static unsigned short atlas_keymap[16]; 37 static struct input_dev *input_dev; 38 39 /* button handling code */ 40 static acpi_status acpi_atlas_button_setup(acpi_handle region_handle, 41 u32 function, void *handler_context, void **return_context) 42 { 43 *return_context = 44 (function != ACPI_REGION_DEACTIVATE) ? handler_context : NULL; 45 46 return AE_OK; 47 } 48 49 static acpi_status acpi_atlas_button_handler(u32 function, 50 acpi_physical_address address, 51 u32 bit_width, u64 *value, 52 void *handler_context, void *region_context) 53 { 54 acpi_status status; 55 56 if (function == ACPI_WRITE) { 57 int code = address & 0x0f; 58 int key_down = !(address & 0x10); 59 60 input_event(input_dev, EV_MSC, MSC_SCAN, code); 61 input_report_key(input_dev, atlas_keymap[code], key_down); 62 input_sync(input_dev); 63 64 status = AE_OK; 65 } else { 66 pr_warn("shrugged on unexpected function: function=%x,address=%lx,value=%x\n", 67 function, (unsigned long)address, (u32)*value); 68 status = AE_BAD_PARAMETER; 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 pr_err("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 pr_err("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 pr_err("error installing addr spc handler\n"); 116 input_unregister_device(input_dev); 117 err = -EINVAL; 118 } 119 120 return err; 121 } 122 123 static int atlas_acpi_button_remove(struct acpi_device *device) 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 pr_err("error removing addr spc handler\n"); 131 132 input_unregister_device(input_dev); 133 134 return 0; 135 } 136 137 static const struct acpi_device_id atlas_device_ids[] = { 138 {"ASIM0000", 0}, 139 {"", 0}, 140 }; 141 MODULE_DEVICE_TABLE(acpi, atlas_device_ids); 142 143 static struct acpi_driver atlas_acpi_driver = { 144 .name = ACPI_ATLAS_NAME, 145 .class = ACPI_ATLAS_CLASS, 146 .owner = THIS_MODULE, 147 .ids = atlas_device_ids, 148 .ops = { 149 .add = atlas_acpi_button_add, 150 .remove = atlas_acpi_button_remove, 151 }, 152 }; 153 module_acpi_driver(atlas_acpi_driver); 154 155 MODULE_AUTHOR("Jaya Kumar"); 156 MODULE_LICENSE("GPL"); 157 MODULE_DESCRIPTION("Atlas button driver"); 158 159