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/platform_device.h> 18 19 #define ACPI_ATLAS_NAME "Atlas ACPI" 20 21 struct atlas_btns { 22 struct input_dev *input_dev; 23 unsigned short keymap[16]; 24 }; 25 26 /* button handling code */ 27 static acpi_status acpi_atlas_button_setup(acpi_handle region_handle, 28 u32 function, void *handler_context, 29 void **return_context) 30 { 31 *return_context = 32 (function != ACPI_REGION_DEACTIVATE) ? handler_context : NULL; 33 34 return AE_OK; 35 } 36 37 static acpi_status acpi_atlas_button_handler(u32 function, 38 acpi_physical_address address, 39 u32 bit_width, u64 *value, 40 void *handler_context, 41 void *region_context) 42 { 43 struct atlas_btns *atlas = region_context; 44 45 if (function == ACPI_WRITE) { 46 int code = address & 0x0f; 47 int key_down = !(address & 0x10); 48 49 input_event(atlas->input_dev, EV_MSC, MSC_SCAN, code); 50 input_report_key(atlas->input_dev, atlas->keymap[code], 51 key_down); 52 input_sync(atlas->input_dev); 53 54 return AE_OK; 55 } 56 57 dev_warn(atlas->input_dev->dev.parent, 58 "unexpected function: function=%x,address=%lx,value=%x\n", 59 function, (unsigned long)address, (u32)*value); 60 61 return AE_BAD_PARAMETER; 62 } 63 64 static int atlas_acpi_button_probe(struct platform_device *pdev) 65 { 66 struct acpi_device *device; 67 struct atlas_btns *atlas; 68 struct input_dev *input_dev; 69 acpi_status status; 70 int i; 71 int err; 72 73 device = ACPI_COMPANION(&pdev->dev); 74 if (!device) 75 return -ENODEV; 76 77 atlas = devm_kzalloc(&pdev->dev, sizeof(*atlas), GFP_KERNEL); 78 if (!atlas) 79 return -ENOMEM; 80 81 input_dev = devm_input_allocate_device(&pdev->dev); 82 if (!input_dev) 83 return -ENOMEM; 84 85 atlas->input_dev = input_dev; 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(atlas->keymap[0]); 92 input_dev->keycodemax = ARRAY_SIZE(atlas->keymap); 93 94 input_set_capability(input_dev, EV_MSC, MSC_SCAN); 95 for (i = 0; i < ARRAY_SIZE(atlas->keymap); i++) { 96 if (i < 9) { 97 atlas->keymap[i] = KEY_F1 + i; 98 input_set_capability(input_dev, EV_KEY, KEY_F1 + i); 99 } else { 100 atlas->keymap[i] = KEY_RESERVED; 101 } 102 } 103 104 err = input_register_device(input_dev); 105 if (err) 106 return dev_err_probe(&pdev->dev, err, 107 "couldn't register input device\n"); 108 109 /* hookup button handler */ 110 status = acpi_install_address_space_handler(device->handle, 111 0x81, 112 &acpi_atlas_button_handler, 113 &acpi_atlas_button_setup, 114 atlas); 115 if (ACPI_FAILURE(status)) 116 return dev_err_probe(&pdev->dev, -EINVAL, 117 "error installing addr spc handler\n"); 118 119 return 0; 120 } 121 122 static void atlas_acpi_button_remove(struct platform_device *pdev) 123 { 124 struct acpi_device *device = ACPI_COMPANION(&pdev->dev); 125 126 acpi_remove_address_space_handler(device->handle, 0x81, 127 &acpi_atlas_button_handler); 128 } 129 130 static const struct acpi_device_id atlas_device_ids[] = { 131 { "ASIM0000" }, 132 { "" } 133 }; 134 MODULE_DEVICE_TABLE(acpi, atlas_device_ids); 135 136 static struct platform_driver atlas_acpi_driver = { 137 .probe = atlas_acpi_button_probe, 138 .remove = atlas_acpi_button_remove, 139 .driver = { 140 .name = ACPI_ATLAS_NAME, 141 .acpi_match_table = atlas_device_ids, 142 }, 143 }; 144 module_platform_driver(atlas_acpi_driver); 145 146 MODULE_AUTHOR("Jaya Kumar"); 147 MODULE_LICENSE("GPL"); 148 MODULE_DESCRIPTION("Atlas button driver"); 149