1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * atlas_btns.c - Atlas Wallmount Touchscreen ACPI Extras 4 * 5 * Copyright (C) 2006 Jaya Kumar 6 * Based on Toshiba ACPI by John Belmonte and ASUS ACPI 7 * This work was sponsored by CIS(M) Sdn Bhd. 8 */ 9 10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 11 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/input.h> 15 #include <linux/types.h> 16 #include <linux/acpi.h> 17 #include <linux/uaccess.h> 18 19 #define ACPI_ATLAS_NAME "Atlas ACPI" 20 #define ACPI_ATLAS_CLASS "Atlas" 21 22 static unsigned short atlas_keymap[16]; 23 static struct input_dev *input_dev; 24 25 /* button handling code */ 26 static acpi_status acpi_atlas_button_setup(acpi_handle region_handle, 27 u32 function, void *handler_context, void **return_context) 28 { 29 *return_context = 30 (function != ACPI_REGION_DEACTIVATE) ? handler_context : NULL; 31 32 return AE_OK; 33 } 34 35 static acpi_status acpi_atlas_button_handler(u32 function, 36 acpi_physical_address address, 37 u32 bit_width, u64 *value, 38 void *handler_context, void *region_context) 39 { 40 acpi_status status; 41 42 if (function == ACPI_WRITE) { 43 int code = address & 0x0f; 44 int key_down = !(address & 0x10); 45 46 input_event(input_dev, EV_MSC, MSC_SCAN, code); 47 input_report_key(input_dev, atlas_keymap[code], key_down); 48 input_sync(input_dev); 49 50 status = AE_OK; 51 } else { 52 pr_warn("shrugged on unexpected function: function=%x,address=%lx,value=%x\n", 53 function, (unsigned long)address, (u32)*value); 54 status = AE_BAD_PARAMETER; 55 } 56 57 return status; 58 } 59 60 static int atlas_acpi_button_add(struct acpi_device *device) 61 { 62 acpi_status status; 63 int i; 64 int err; 65 66 input_dev = input_allocate_device(); 67 if (!input_dev) { 68 pr_err("unable to allocate input device\n"); 69 return -ENOMEM; 70 } 71 72 input_dev->name = "Atlas ACPI button driver"; 73 input_dev->phys = "ASIM0000/atlas/input0"; 74 input_dev->id.bustype = BUS_HOST; 75 input_dev->keycode = atlas_keymap; 76 input_dev->keycodesize = sizeof(unsigned short); 77 input_dev->keycodemax = ARRAY_SIZE(atlas_keymap); 78 79 input_set_capability(input_dev, EV_MSC, MSC_SCAN); 80 __set_bit(EV_KEY, input_dev->evbit); 81 for (i = 0; i < ARRAY_SIZE(atlas_keymap); i++) { 82 if (i < 9) { 83 atlas_keymap[i] = KEY_F1 + i; 84 __set_bit(KEY_F1 + i, input_dev->keybit); 85 } else 86 atlas_keymap[i] = KEY_RESERVED; 87 } 88 89 err = input_register_device(input_dev); 90 if (err) { 91 pr_err("couldn't register input device\n"); 92 input_free_device(input_dev); 93 return err; 94 } 95 96 /* hookup button handler */ 97 status = acpi_install_address_space_handler(device->handle, 98 0x81, &acpi_atlas_button_handler, 99 &acpi_atlas_button_setup, device); 100 if (ACPI_FAILURE(status)) { 101 pr_err("error installing addr spc handler\n"); 102 input_unregister_device(input_dev); 103 err = -EINVAL; 104 } 105 106 return err; 107 } 108 109 static void atlas_acpi_button_remove(struct acpi_device *device) 110 { 111 acpi_status status; 112 113 status = acpi_remove_address_space_handler(device->handle, 114 0x81, &acpi_atlas_button_handler); 115 if (ACPI_FAILURE(status)) 116 pr_err("error removing addr spc handler\n"); 117 118 input_unregister_device(input_dev); 119 } 120 121 static const struct acpi_device_id atlas_device_ids[] = { 122 {"ASIM0000", 0}, 123 {"", 0}, 124 }; 125 MODULE_DEVICE_TABLE(acpi, atlas_device_ids); 126 127 static struct acpi_driver atlas_acpi_driver = { 128 .name = ACPI_ATLAS_NAME, 129 .class = ACPI_ATLAS_CLASS, 130 .ids = atlas_device_ids, 131 .ops = { 132 .add = atlas_acpi_button_add, 133 .remove = atlas_acpi_button_remove, 134 }, 135 }; 136 module_acpi_driver(atlas_acpi_driver); 137 138 MODULE_AUTHOR("Jaya Kumar"); 139 MODULE_LICENSE("GPL"); 140 MODULE_DESCRIPTION("Atlas button driver"); 141 142