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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 | ||
52 | priv->input_dev = input_allocate_device(); | |
53 | if (!priv->input_dev) | |
54 | return -ENOMEM; | |
55 | ||
56 | ret = sparse_keymap_setup(priv->input_dev, intel_vbtn_keymap, NULL); | |
57 | if (ret) | |
58 | goto err_free_device; | |
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 | ||
64 | ret = input_register_device(priv->input_dev); | |
65 | if (ret) | |
66 | goto err_free_device; | |
67 | ||
68 | return 0; | |
69 | ||
70 | err_free_device: | |
71 | input_free_device(priv->input_dev); | |
72 | return ret; | |
73 | } | |
74 | ||
75 | static void intel_vbtn_input_destroy(struct platform_device *device) | |
76 | { | |
77 | struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev); | |
78 | ||
79 | input_unregister_device(priv->input_dev); | |
80 | } | |
81 | ||
82 | static void notify_handler(acpi_handle handle, u32 event, void *context) | |
83 | { | |
84 | struct platform_device *device = context; | |
85 | struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev); | |
86 | ||
87 | if (!sparse_keymap_report_event(priv->input_dev, event, 1, true)) | |
88 | dev_info(&device->dev, "unknown event index 0x%x\n", | |
89 | event); | |
90 | } | |
91 | ||
92 | static int intel_vbtn_probe(struct platform_device *device) | |
93 | { | |
94 | acpi_handle handle = ACPI_HANDLE(&device->dev); | |
95 | struct intel_vbtn_priv *priv; | |
96 | acpi_status status; | |
97 | int err; | |
98 | ||
99 | status = acpi_evaluate_object(handle, "VBDL", NULL, NULL); | |
100 | if (!ACPI_SUCCESS(status)) { | |
101 | dev_warn(&device->dev, "failed to read Intel Virtual Button driver\n"); | |
102 | return -ENODEV; | |
103 | } | |
104 | ||
105 | priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL); | |
106 | if (!priv) | |
107 | return -ENOMEM; | |
108 | dev_set_drvdata(&device->dev, priv); | |
109 | ||
110 | err = intel_vbtn_input_setup(device); | |
111 | if (err) { | |
112 | pr_err("Failed to setup Intel Virtual Button\n"); | |
113 | return err; | |
114 | } | |
115 | ||
116 | status = acpi_install_notify_handler(handle, | |
117 | ACPI_DEVICE_NOTIFY, | |
118 | notify_handler, | |
119 | device); | |
120 | if (ACPI_FAILURE(status)) { | |
121 | err = -EBUSY; | |
122 | goto err_remove_input; | |
123 | } | |
124 | ||
125 | return 0; | |
126 | ||
127 | err_remove_input: | |
128 | intel_vbtn_input_destroy(device); | |
129 | ||
130 | return err; | |
131 | } | |
132 | ||
133 | static int intel_vbtn_remove(struct platform_device *device) | |
134 | { | |
135 | acpi_handle handle = ACPI_HANDLE(&device->dev); | |
136 | ||
137 | intel_vbtn_input_destroy(device); | |
138 | acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler); | |
139 | ||
140 | /* | |
141 | * Even if we failed to shut off the event stream, we can still | |
142 | * safely detach from the device. | |
143 | */ | |
144 | return 0; | |
145 | } | |
146 | ||
147 | static struct platform_driver intel_vbtn_pl_driver = { | |
148 | .driver = { | |
149 | .name = "intel-vbtn", | |
150 | .acpi_match_table = intel_vbtn_ids, | |
151 | }, | |
152 | .probe = intel_vbtn_probe, | |
153 | .remove = intel_vbtn_remove, | |
154 | }; | |
155 | MODULE_DEVICE_TABLE(acpi, intel_vbtn_ids); | |
156 | ||
157 | static acpi_status __init | |
158 | check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv) | |
159 | { | |
160 | const struct acpi_device_id *ids = context; | |
161 | struct acpi_device *dev; | |
162 | ||
163 | if (acpi_bus_get_device(handle, &dev) != 0) | |
164 | return AE_OK; | |
165 | ||
166 | if (acpi_match_device_ids(dev, ids) == 0) | |
167 | if (acpi_create_platform_device(dev)) | |
168 | dev_info(&dev->dev, | |
169 | "intel-vbtn: created platform device\n"); | |
170 | ||
171 | return AE_OK; | |
172 | } | |
173 | ||
174 | static int __init intel_vbtn_init(void) | |
175 | { | |
176 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
177 | ACPI_UINT32_MAX, check_acpi_dev, NULL, | |
178 | (void *)intel_vbtn_ids, NULL); | |
179 | ||
180 | return platform_driver_register(&intel_vbtn_pl_driver); | |
181 | } | |
182 | module_init(intel_vbtn_init); | |
183 | ||
184 | static void __exit intel_vbtn_exit(void) | |
185 | { | |
186 | platform_driver_unregister(&intel_vbtn_pl_driver); | |
187 | } | |
188 | module_exit(intel_vbtn_exit); |