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332e0812 AK |
1 | /* |
2 | * Intel Virtual Button driver for Windows 8.1+ | |
3 | * | |
4 | * Copyright (C) 2016 AceLan Kao <acelan.kao@canonical.com> | |
5 | * Copyright (C) 2016 Alex Hung <alex.hung@canonical.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/input.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/input/sparse-keymap.h> | |
25 | #include <linux/acpi.h> | |
26 | #include <acpi/acpi_bus.h> | |
27 | ||
28 | MODULE_LICENSE("GPL"); | |
29 | MODULE_AUTHOR("AceLan Kao"); | |
30 | ||
31 | static const struct acpi_device_id intel_vbtn_ids[] = { | |
32 | {"INT33D6", 0}, | |
33 | {"", 0}, | |
34 | }; | |
35 | ||
36 | /* In theory, these are HID usages. */ | |
37 | static const struct key_entry intel_vbtn_keymap[] = { | |
38 | { KE_IGNORE, 0xC0, { KEY_POWER } }, /* power key press */ | |
39 | { KE_KEY, 0xC1, { KEY_POWER } }, /* power key release */ | |
40 | { KE_END }, | |
41 | }; | |
42 | ||
43 | struct intel_vbtn_priv { | |
44 | struct input_dev *input_dev; | |
45 | }; | |
46 | ||
47 | static int intel_vbtn_input_setup(struct platform_device *device) | |
48 | { | |
49 | struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev); | |
50 | int ret; | |
51 | ||
bb9ad484 | 52 | priv->input_dev = devm_input_allocate_device(&device->dev); |
332e0812 AK |
53 | if (!priv->input_dev) |
54 | return -ENOMEM; | |
55 | ||
56 | ret = sparse_keymap_setup(priv->input_dev, intel_vbtn_keymap, NULL); | |
57 | if (ret) | |
bb9ad484 | 58 | return ret; |
332e0812 AK |
59 | |
60 | priv->input_dev->dev.parent = &device->dev; | |
61 | priv->input_dev->name = "Intel Virtual Button driver"; | |
62 | priv->input_dev->id.bustype = BUS_HOST; | |
63 | ||
bb9ad484 | 64 | return input_register_device(priv->input_dev); |
332e0812 AK |
65 | } |
66 | ||
67 | static void notify_handler(acpi_handle handle, u32 event, void *context) | |
68 | { | |
69 | struct platform_device *device = context; | |
70 | struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev); | |
71 | ||
72 | if (!sparse_keymap_report_event(priv->input_dev, event, 1, true)) | |
73 | dev_info(&device->dev, "unknown event index 0x%x\n", | |
74 | event); | |
75 | } | |
76 | ||
77 | static int intel_vbtn_probe(struct platform_device *device) | |
78 | { | |
79 | acpi_handle handle = ACPI_HANDLE(&device->dev); | |
80 | struct intel_vbtn_priv *priv; | |
81 | acpi_status status; | |
82 | int err; | |
83 | ||
84 | status = acpi_evaluate_object(handle, "VBDL", NULL, NULL); | |
3526ecad | 85 | if (ACPI_FAILURE(status)) { |
332e0812 AK |
86 | dev_warn(&device->dev, "failed to read Intel Virtual Button driver\n"); |
87 | return -ENODEV; | |
88 | } | |
89 | ||
90 | priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL); | |
91 | if (!priv) | |
92 | return -ENOMEM; | |
93 | dev_set_drvdata(&device->dev, priv); | |
94 | ||
95 | err = intel_vbtn_input_setup(device); | |
96 | if (err) { | |
97 | pr_err("Failed to setup Intel Virtual Button\n"); | |
98 | return err; | |
99 | } | |
100 | ||
101 | status = acpi_install_notify_handler(handle, | |
102 | ACPI_DEVICE_NOTIFY, | |
103 | notify_handler, | |
104 | device); | |
bb9ad484 AL |
105 | if (ACPI_FAILURE(status)) |
106 | return -EBUSY; | |
332e0812 AK |
107 | |
108 | return 0; | |
332e0812 AK |
109 | } |
110 | ||
111 | static int intel_vbtn_remove(struct platform_device *device) | |
112 | { | |
113 | acpi_handle handle = ACPI_HANDLE(&device->dev); | |
114 | ||
332e0812 AK |
115 | acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler); |
116 | ||
117 | /* | |
118 | * Even if we failed to shut off the event stream, we can still | |
119 | * safely detach from the device. | |
120 | */ | |
121 | return 0; | |
122 | } | |
123 | ||
124 | static struct platform_driver intel_vbtn_pl_driver = { | |
125 | .driver = { | |
126 | .name = "intel-vbtn", | |
127 | .acpi_match_table = intel_vbtn_ids, | |
128 | }, | |
129 | .probe = intel_vbtn_probe, | |
130 | .remove = intel_vbtn_remove, | |
131 | }; | |
132 | MODULE_DEVICE_TABLE(acpi, intel_vbtn_ids); | |
133 | ||
134 | static acpi_status __init | |
135 | check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv) | |
136 | { | |
137 | const struct acpi_device_id *ids = context; | |
138 | struct acpi_device *dev; | |
139 | ||
140 | if (acpi_bus_get_device(handle, &dev) != 0) | |
141 | return AE_OK; | |
142 | ||
143 | if (acpi_match_device_ids(dev, ids) == 0) | |
1571875b | 144 | if (acpi_create_platform_device(dev, NULL)) |
332e0812 AK |
145 | dev_info(&dev->dev, |
146 | "intel-vbtn: created platform device\n"); | |
147 | ||
148 | return AE_OK; | |
149 | } | |
150 | ||
151 | static int __init intel_vbtn_init(void) | |
152 | { | |
153 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
154 | ACPI_UINT32_MAX, check_acpi_dev, NULL, | |
155 | (void *)intel_vbtn_ids, NULL); | |
156 | ||
157 | return platform_driver_register(&intel_vbtn_pl_driver); | |
158 | } | |
159 | module_init(intel_vbtn_init); | |
160 | ||
161 | static void __exit intel_vbtn_exit(void) | |
162 | { | |
163 | platform_driver_unregister(&intel_vbtn_pl_driver); | |
164 | } | |
165 | module_exit(intel_vbtn_exit); |