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(dev: input_dev, EV_MSC, MSC_SCAN, value: code); |
47 | input_report_key(dev: input_dev, code: atlas_keymap[code], value: key_down); |
48 | input_sync(dev: 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(dev: 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(dev: input_dev); |
93 | return err; |
94 | } |
95 | |
96 | /* hookup button handler */ |
97 | status = acpi_install_address_space_handler(device: device->handle, |
98 | space_id: 0x81, handler: &acpi_atlas_button_handler, |
99 | setup: &acpi_atlas_button_setup, context: 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: device->handle, |
114 | space_id: 0x81, handler: &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 | .owner = THIS_MODULE, |
131 | .ids = atlas_device_ids, |
132 | .ops = { |
133 | .add = atlas_acpi_button_add, |
134 | .remove = atlas_acpi_button_remove, |
135 | }, |
136 | }; |
137 | module_acpi_driver(atlas_acpi_driver); |
138 | |
139 | MODULE_AUTHOR("Jaya Kumar" ); |
140 | MODULE_LICENSE("GPL" ); |
141 | MODULE_DESCRIPTION("Atlas button driver" ); |
142 | |
143 | |