Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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#include <linux/uaccess.h>
19
20#define ACPI_ATLAS_NAME "Atlas ACPI"
21#define ACPI_ATLAS_CLASS "Atlas"
22
23static unsigned short atlas_keymap[16];
24static struct input_dev *input_dev;
25
26/* button handling code */
27static acpi_status acpi_atlas_button_setup(acpi_handle region_handle,
28 u32 function, void *handler_context, void **return_context)
29{
30 *return_context =
31 (function != ACPI_REGION_DEACTIVATE) ? handler_context : NULL;
32
33 return AE_OK;
34}
35
36static acpi_status acpi_atlas_button_handler(u32 function,
37 acpi_physical_address address,
38 u32 bit_width, u64 *value,
39 void *handler_context, void *region_context)
40{
41 acpi_status status;
42
43 if (function == ACPI_WRITE) {
44 int code = address & 0x0f;
45 int key_down = !(address & 0x10);
46
47 input_event(input_dev, EV_MSC, MSC_SCAN, code);
48 input_report_key(input_dev, atlas_keymap[code], key_down);
49 input_sync(input_dev);
50
51 status = AE_OK;
52 } else {
53 pr_warn("shrugged on unexpected function: function=%x,address=%lx,value=%x\n",
54 function, (unsigned long)address, (u32)*value);
55 status = AE_BAD_PARAMETER;
56 }
57
58 return status;
59}
60
61static int atlas_acpi_button_probe(struct platform_device *pdev)
62{
63 struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
64 acpi_status status;
65 int i;
66 int err;
67
68 input_dev = input_allocate_device();
69 if (!input_dev) {
70 pr_err("unable to allocate input device\n");
71 return -ENOMEM;
72 }
73
74 input_dev->name = "Atlas ACPI button driver";
75 input_dev->phys = "ASIM0000/atlas/input0";
76 input_dev->id.bustype = BUS_HOST;
77 input_dev->keycode = atlas_keymap;
78 input_dev->keycodesize = sizeof(unsigned short);
79 input_dev->keycodemax = ARRAY_SIZE(atlas_keymap);
80
81 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
82 __set_bit(EV_KEY, input_dev->evbit);
83 for (i = 0; i < ARRAY_SIZE(atlas_keymap); i++) {
84 if (i < 9) {
85 atlas_keymap[i] = KEY_F1 + i;
86 __set_bit(KEY_F1 + i, input_dev->keybit);
87 } else
88 atlas_keymap[i] = KEY_RESERVED;
89 }
90
91 err = input_register_device(input_dev);
92 if (err) {
93 pr_err("couldn't register input device\n");
94 input_free_device(input_dev);
95 return err;
96 }
97
98 /* hookup button handler */
99 status = acpi_install_address_space_handler(device->handle,
100 0x81, &acpi_atlas_button_handler,
101 &acpi_atlas_button_setup, device);
102 if (ACPI_FAILURE(status)) {
103 pr_err("error installing addr spc handler\n");
104 input_unregister_device(input_dev);
105 err = -EINVAL;
106 }
107
108 return err;
109}
110
111static void atlas_acpi_button_remove(struct platform_device *pdev)
112{
113 struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
114 acpi_status status;
115
116 status = acpi_remove_address_space_handler(device->handle,
117 0x81, &acpi_atlas_button_handler);
118 if (ACPI_FAILURE(status))
119 pr_err("error removing addr spc handler\n");
120
121 input_unregister_device(input_dev);
122}
123
124static const struct acpi_device_id atlas_device_ids[] = {
125 {"ASIM0000", 0},
126 {"", 0},
127};
128MODULE_DEVICE_TABLE(acpi, atlas_device_ids);
129
130static struct platform_driver atlas_acpi_driver = {
131 .probe = atlas_acpi_button_probe,
132 .remove = atlas_acpi_button_remove,
133 .driver = {
134 .name = ACPI_ATLAS_NAME,
135 .acpi_match_table = atlas_device_ids,
136 },
137};
138module_platform_driver(atlas_acpi_driver);
139
140MODULE_AUTHOR("Jaya Kumar");
141MODULE_LICENSE("GPL");
142MODULE_DESCRIPTION("Atlas button driver");
143