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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> | |
91f9e850 | 26 | #include <linux/suspend.h> |
332e0812 AK |
27 | #include <acpi/acpi_bus.h> |
28 | ||
29 | MODULE_LICENSE("GPL"); | |
30 | MODULE_AUTHOR("AceLan Kao"); | |
31 | ||
32 | static const struct acpi_device_id intel_vbtn_ids[] = { | |
33 | {"INT33D6", 0}, | |
34 | {"", 0}, | |
35 | }; | |
36 | ||
37 | /* In theory, these are HID usages. */ | |
38 | static const struct key_entry intel_vbtn_keymap[] = { | |
c801603e ML |
39 | { KE_KEY, 0xC0, { KEY_POWER } }, /* power key press */ |
40 | { KE_IGNORE, 0xC1, { KEY_POWER } }, /* power key release */ | |
8d9e2997 MM |
41 | { KE_KEY, 0xC4, { KEY_VOLUMEUP } }, /* volume-up key press */ |
42 | { KE_IGNORE, 0xC5, { KEY_VOLUMEUP } }, /* volume-up key release */ | |
43 | { KE_KEY, 0xC6, { KEY_VOLUMEDOWN } }, /* volume-down key press */ | |
44 | { KE_IGNORE, 0xC7, { KEY_VOLUMEDOWN } }, /* volume-down key release */ | |
332e0812 AK |
45 | { KE_END }, |
46 | }; | |
47 | ||
48 | struct intel_vbtn_priv { | |
49 | struct input_dev *input_dev; | |
91f9e850 | 50 | bool wakeup_mode; |
332e0812 AK |
51 | }; |
52 | ||
53 | static int intel_vbtn_input_setup(struct platform_device *device) | |
54 | { | |
55 | struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev); | |
56 | int ret; | |
57 | ||
bb9ad484 | 58 | priv->input_dev = devm_input_allocate_device(&device->dev); |
332e0812 AK |
59 | if (!priv->input_dev) |
60 | return -ENOMEM; | |
61 | ||
62 | ret = sparse_keymap_setup(priv->input_dev, intel_vbtn_keymap, NULL); | |
63 | if (ret) | |
bb9ad484 | 64 | return ret; |
332e0812 AK |
65 | |
66 | priv->input_dev->dev.parent = &device->dev; | |
67 | priv->input_dev->name = "Intel Virtual Button driver"; | |
68 | priv->input_dev->id.bustype = BUS_HOST; | |
69 | ||
bb9ad484 | 70 | return input_register_device(priv->input_dev); |
332e0812 AK |
71 | } |
72 | ||
73 | static void notify_handler(acpi_handle handle, u32 event, void *context) | |
74 | { | |
75 | struct platform_device *device = context; | |
76 | struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev); | |
77 | ||
91f9e850 RW |
78 | if (priv->wakeup_mode) { |
79 | if (sparse_keymap_entry_from_scancode(priv->input_dev, event)) { | |
80 | pm_wakeup_hard_event(&device->dev); | |
81 | return; | |
82 | } | |
83 | } else if (sparse_keymap_report_event(priv->input_dev, event, 1, true)) { | |
84 | return; | |
85 | } | |
a9c37b74 | 86 | dev_dbg(&device->dev, "unknown event index 0x%x\n", event); |
332e0812 AK |
87 | } |
88 | ||
89 | static int intel_vbtn_probe(struct platform_device *device) | |
90 | { | |
91 | acpi_handle handle = ACPI_HANDLE(&device->dev); | |
92 | struct intel_vbtn_priv *priv; | |
93 | acpi_status status; | |
94 | int err; | |
95 | ||
96 | status = acpi_evaluate_object(handle, "VBDL", NULL, NULL); | |
3526ecad | 97 | if (ACPI_FAILURE(status)) { |
332e0812 AK |
98 | dev_warn(&device->dev, "failed to read Intel Virtual Button driver\n"); |
99 | return -ENODEV; | |
100 | } | |
101 | ||
102 | priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL); | |
103 | if (!priv) | |
104 | return -ENOMEM; | |
105 | dev_set_drvdata(&device->dev, priv); | |
106 | ||
107 | err = intel_vbtn_input_setup(device); | |
108 | if (err) { | |
109 | pr_err("Failed to setup Intel Virtual Button\n"); | |
110 | return err; | |
111 | } | |
112 | ||
113 | status = acpi_install_notify_handler(handle, | |
114 | ACPI_DEVICE_NOTIFY, | |
115 | notify_handler, | |
116 | device); | |
bb9ad484 AL |
117 | if (ACPI_FAILURE(status)) |
118 | return -EBUSY; | |
332e0812 | 119 | |
91f9e850 | 120 | device_init_wakeup(&device->dev, true); |
332e0812 | 121 | return 0; |
332e0812 AK |
122 | } |
123 | ||
124 | static int intel_vbtn_remove(struct platform_device *device) | |
125 | { | |
126 | acpi_handle handle = ACPI_HANDLE(&device->dev); | |
127 | ||
332e0812 AK |
128 | acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler); |
129 | ||
130 | /* | |
131 | * Even if we failed to shut off the event stream, we can still | |
132 | * safely detach from the device. | |
133 | */ | |
134 | return 0; | |
135 | } | |
136 | ||
91f9e850 RW |
137 | static int intel_vbtn_pm_prepare(struct device *dev) |
138 | { | |
139 | struct intel_vbtn_priv *priv = dev_get_drvdata(dev); | |
140 | ||
141 | priv->wakeup_mode = true; | |
142 | return 0; | |
143 | } | |
144 | ||
145 | static int intel_vbtn_pm_resume(struct device *dev) | |
146 | { | |
147 | struct intel_vbtn_priv *priv = dev_get_drvdata(dev); | |
148 | ||
149 | priv->wakeup_mode = false; | |
150 | return 0; | |
151 | } | |
152 | ||
153 | static const struct dev_pm_ops intel_vbtn_pm_ops = { | |
154 | .prepare = intel_vbtn_pm_prepare, | |
155 | .resume = intel_vbtn_pm_resume, | |
156 | .restore = intel_vbtn_pm_resume, | |
157 | .thaw = intel_vbtn_pm_resume, | |
158 | }; | |
159 | ||
332e0812 AK |
160 | static struct platform_driver intel_vbtn_pl_driver = { |
161 | .driver = { | |
162 | .name = "intel-vbtn", | |
163 | .acpi_match_table = intel_vbtn_ids, | |
91f9e850 | 164 | .pm = &intel_vbtn_pm_ops, |
332e0812 AK |
165 | }, |
166 | .probe = intel_vbtn_probe, | |
167 | .remove = intel_vbtn_remove, | |
168 | }; | |
169 | MODULE_DEVICE_TABLE(acpi, intel_vbtn_ids); | |
170 | ||
171 | static acpi_status __init | |
172 | check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv) | |
173 | { | |
174 | const struct acpi_device_id *ids = context; | |
175 | struct acpi_device *dev; | |
176 | ||
177 | if (acpi_bus_get_device(handle, &dev) != 0) | |
178 | return AE_OK; | |
179 | ||
180 | if (acpi_match_device_ids(dev, ids) == 0) | |
1571875b | 181 | if (acpi_create_platform_device(dev, NULL)) |
332e0812 AK |
182 | dev_info(&dev->dev, |
183 | "intel-vbtn: created platform device\n"); | |
184 | ||
185 | return AE_OK; | |
186 | } | |
187 | ||
188 | static int __init intel_vbtn_init(void) | |
189 | { | |
190 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
191 | ACPI_UINT32_MAX, check_acpi_dev, NULL, | |
192 | (void *)intel_vbtn_ids, NULL); | |
193 | ||
194 | return platform_driver_register(&intel_vbtn_pl_driver); | |
195 | } | |
196 | module_init(intel_vbtn_init); | |
197 | ||
198 | static void __exit intel_vbtn_exit(void) | |
199 | { | |
200 | platform_driver_unregister(&intel_vbtn_pl_driver); | |
201 | } | |
202 | module_exit(intel_vbtn_exit); |