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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
31ea7ff0 JK |
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. | |
31ea7ff0 JK |
8 | */ |
9 | ||
bf77499f DT |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
11 | ||
31ea7ff0 JK |
12 | #include <linux/kernel.h> |
13 | #include <linux/module.h> | |
31ea7ff0 JK |
14 | #include <linux/input.h> |
15 | #include <linux/types.h> | |
8b48463f | 16 | #include <linux/acpi.h> |
7c0f6ba6 | 17 | #include <linux/uaccess.h> |
31ea7ff0 | 18 | |
72341eea DT |
19 | #define ACPI_ATLAS_NAME "Atlas ACPI" |
20 | #define ACPI_ATLAS_CLASS "Atlas" | |
31ea7ff0 | 21 | |
72341eea | 22 | static unsigned short atlas_keymap[16]; |
31ea7ff0 JK |
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, | |
439913ff | 37 | u32 bit_width, u64 *value, |
31ea7ff0 JK |
38 | void *handler_context, void *region_context) |
39 | { | |
40 | acpi_status status; | |
31ea7ff0 JK |
41 | |
42 | if (function == ACPI_WRITE) { | |
72341eea DT |
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); | |
31ea7ff0 | 48 | input_sync(input_dev); |
72341eea | 49 | |
02b5fac1 | 50 | status = AE_OK; |
31ea7ff0 | 51 | } else { |
bf77499f | 52 | pr_warn("shrugged on unexpected function: function=%x,address=%lx,value=%x\n", |
31ea7ff0 | 53 | function, (unsigned long)address, (u32)*value); |
02b5fac1 | 54 | status = AE_BAD_PARAMETER; |
31ea7ff0 JK |
55 | } |
56 | ||
57 | return status; | |
58 | } | |
59 | ||
60 | static int atlas_acpi_button_add(struct acpi_device *device) | |
61 | { | |
62 | acpi_status status; | |
72341eea | 63 | int i; |
31ea7ff0 JK |
64 | int err; |
65 | ||
66 | input_dev = input_allocate_device(); | |
67 | if (!input_dev) { | |
bf77499f | 68 | pr_err("unable to allocate input device\n"); |
31ea7ff0 JK |
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; | |
72341eea DT |
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 | } | |
31ea7ff0 JK |
88 | |
89 | err = input_register_device(input_dev); | |
90 | if (err) { | |
bf77499f | 91 | pr_err("couldn't register input device\n"); |
31ea7ff0 JK |
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)) { | |
bf77499f | 101 | pr_err("error installing addr spc handler\n"); |
31ea7ff0 | 102 | input_unregister_device(input_dev); |
02b5fac1 | 103 | err = -EINVAL; |
31ea7ff0 JK |
104 | } |
105 | ||
02b5fac1 | 106 | return err; |
31ea7ff0 JK |
107 | } |
108 | ||
51fac838 | 109 | static int atlas_acpi_button_remove(struct acpi_device *device) |
31ea7ff0 JK |
110 | { |
111 | acpi_status status; | |
112 | ||
113 | status = acpi_remove_address_space_handler(device->handle, | |
114 | 0x81, &acpi_atlas_button_handler); | |
02b5fac1 | 115 | if (ACPI_FAILURE(status)) |
bf77499f | 116 | pr_err("error removing addr spc handler\n"); |
31ea7ff0 JK |
117 | |
118 | input_unregister_device(input_dev); | |
119 | ||
02b5fac1 | 120 | return 0; |
31ea7ff0 JK |
121 | } |
122 | ||
1ba90e3a TR |
123 | static const struct acpi_device_id atlas_device_ids[] = { |
124 | {"ASIM0000", 0}, | |
125 | {"", 0}, | |
126 | }; | |
127 | MODULE_DEVICE_TABLE(acpi, atlas_device_ids); | |
128 | ||
31ea7ff0 JK |
129 | static struct acpi_driver atlas_acpi_driver = { |
130 | .name = ACPI_ATLAS_NAME, | |
131 | .class = ACPI_ATLAS_CLASS, | |
07d19ffc | 132 | .owner = THIS_MODULE, |
1ba90e3a | 133 | .ids = atlas_device_ids, |
31ea7ff0 JK |
134 | .ops = { |
135 | .add = atlas_acpi_button_add, | |
136 | .remove = atlas_acpi_button_remove, | |
137 | }, | |
138 | }; | |
f06efccf | 139 | module_acpi_driver(atlas_acpi_driver); |
31ea7ff0 JK |
140 | |
141 | MODULE_AUTHOR("Jaya Kumar"); | |
142 | MODULE_LICENSE("GPL"); | |
143 | MODULE_DESCRIPTION("Atlas button driver"); | |
144 |