Commit | Line | Data |
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2508a45a CY |
1 | /* |
2 | * power/home/volume button support for | |
6d5ac6e1 | 3 | * Microsoft Surface Pro 3/4 tablet. |
2508a45a CY |
4 | * |
5 | * Copyright (c) 2015 Intel Corporation. | |
6 | * All rights reserved. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; version 2 | |
11 | * of the License. | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/input.h> | |
19 | #include <linux/acpi.h> | |
20 | #include <acpi/button.h> | |
21 | ||
6d5ac6e1 WX |
22 | #define SURFACE_PRO3_BUTTON_HID "MSHW0028" |
23 | #define SURFACE_PRO4_BUTTON_HID "MSHW0040" | |
2508a45a | 24 | #define SURFACE_BUTTON_OBJ_NAME "VGBI" |
6d5ac6e1 | 25 | #define SURFACE_BUTTON_DEVICE_NAME "Surface Pro 3/4 Buttons" |
2508a45a CY |
26 | |
27 | #define SURFACE_BUTTON_NOTIFY_PRESS_POWER 0xc6 | |
28 | #define SURFACE_BUTTON_NOTIFY_RELEASE_POWER 0xc7 | |
29 | ||
30 | #define SURFACE_BUTTON_NOTIFY_PRESS_HOME 0xc4 | |
31 | #define SURFACE_BUTTON_NOTIFY_RELEASE_HOME 0xc5 | |
32 | ||
33 | #define SURFACE_BUTTON_NOTIFY_PRESS_VOLUME_UP 0xc0 | |
34 | #define SURFACE_BUTTON_NOTIFY_RELEASE_VOLUME_UP 0xc1 | |
35 | ||
36 | #define SURFACE_BUTTON_NOTIFY_PRESS_VOLUME_DOWN 0xc2 | |
37 | #define SURFACE_BUTTON_NOTIFY_RELEASE_VOLUME_DOWN 0xc3 | |
38 | ||
39 | ACPI_MODULE_NAME("surface pro 3 button"); | |
40 | ||
41 | MODULE_AUTHOR("Chen Yu"); | |
42 | MODULE_DESCRIPTION("Surface Pro3 Button Driver"); | |
43 | MODULE_LICENSE("GPL v2"); | |
44 | ||
45 | /* | |
46 | * Power button, Home button, Volume buttons support is supposed to | |
47 | * be covered by drivers/input/misc/soc_button_array.c, which is implemented | |
48 | * according to "Windows ACPI Design Guide for SoC Platforms". | |
49 | * However surface pro3 seems not to obey the specs, instead it uses | |
50 | * device VGBI(MSHW0028) for dispatching the events. | |
51 | * We choose acpi_driver rather than platform_driver/i2c_driver because | |
52 | * although VGBI has an i2c resource connected to i2c controller, it | |
53 | * is not embedded in any i2c controller's scope, thus neither platform_device | |
54 | * will be created, nor i2c_client will be enumerated, we have to use | |
55 | * acpi_driver. | |
56 | */ | |
57 | static const struct acpi_device_id surface_button_device_ids[] = { | |
6d5ac6e1 WX |
58 | {SURFACE_PRO3_BUTTON_HID, 0}, |
59 | {SURFACE_PRO4_BUTTON_HID, 0}, | |
2508a45a CY |
60 | {"", 0}, |
61 | }; | |
62 | MODULE_DEVICE_TABLE(acpi, surface_button_device_ids); | |
63 | ||
64 | struct surface_button { | |
65 | unsigned int type; | |
66 | struct input_dev *input; | |
67 | char phys[32]; /* for input device */ | |
68 | unsigned long pushed; | |
69 | bool suspended; | |
70 | }; | |
71 | ||
72 | static void surface_button_notify(struct acpi_device *device, u32 event) | |
73 | { | |
74 | struct surface_button *button = acpi_driver_data(device); | |
75 | struct input_dev *input; | |
76 | int key_code = KEY_RESERVED; | |
77 | bool pressed = false; | |
78 | ||
79 | switch (event) { | |
80 | /* Power button press,release handle */ | |
81 | case SURFACE_BUTTON_NOTIFY_PRESS_POWER: | |
82 | pressed = true; | |
83 | /*fall through*/ | |
84 | case SURFACE_BUTTON_NOTIFY_RELEASE_POWER: | |
85 | key_code = KEY_POWER; | |
86 | break; | |
87 | /* Home button press,release handle */ | |
88 | case SURFACE_BUTTON_NOTIFY_PRESS_HOME: | |
89 | pressed = true; | |
90 | /*fall through*/ | |
91 | case SURFACE_BUTTON_NOTIFY_RELEASE_HOME: | |
92 | key_code = KEY_LEFTMETA; | |
93 | break; | |
94 | /* Volume up button press,release handle */ | |
95 | case SURFACE_BUTTON_NOTIFY_PRESS_VOLUME_UP: | |
96 | pressed = true; | |
97 | /*fall through*/ | |
98 | case SURFACE_BUTTON_NOTIFY_RELEASE_VOLUME_UP: | |
99 | key_code = KEY_VOLUMEUP; | |
100 | break; | |
101 | /* Volume down button press,release handle */ | |
102 | case SURFACE_BUTTON_NOTIFY_PRESS_VOLUME_DOWN: | |
103 | pressed = true; | |
104 | /*fall through*/ | |
105 | case SURFACE_BUTTON_NOTIFY_RELEASE_VOLUME_DOWN: | |
106 | key_code = KEY_VOLUMEDOWN; | |
107 | break; | |
108 | default: | |
109 | dev_info_ratelimited(&device->dev, | |
110 | "Unsupported event [0x%x]\n", event); | |
111 | break; | |
112 | } | |
113 | input = button->input; | |
4bef0a27 | 114 | if (key_code == KEY_RESERVED) |
2508a45a CY |
115 | return; |
116 | if (pressed) | |
117 | pm_wakeup_event(&device->dev, 0); | |
118 | if (button->suspended) | |
119 | return; | |
120 | input_report_key(input, key_code, pressed?1:0); | |
121 | input_sync(input); | |
122 | } | |
123 | ||
124 | #ifdef CONFIG_PM_SLEEP | |
125 | static int surface_button_suspend(struct device *dev) | |
126 | { | |
127 | struct acpi_device *device = to_acpi_device(dev); | |
128 | struct surface_button *button = acpi_driver_data(device); | |
129 | ||
130 | button->suspended = true; | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static int surface_button_resume(struct device *dev) | |
135 | { | |
136 | struct acpi_device *device = to_acpi_device(dev); | |
137 | struct surface_button *button = acpi_driver_data(device); | |
138 | ||
139 | button->suspended = false; | |
140 | return 0; | |
141 | } | |
142 | #endif | |
143 | ||
144 | static int surface_button_add(struct acpi_device *device) | |
145 | { | |
146 | struct surface_button *button; | |
147 | struct input_dev *input; | |
148 | const char *hid = acpi_device_hid(device); | |
149 | char *name; | |
150 | int error; | |
151 | ||
152 | if (strncmp(acpi_device_bid(device), SURFACE_BUTTON_OBJ_NAME, | |
153 | strlen(SURFACE_BUTTON_OBJ_NAME))) | |
154 | return -ENODEV; | |
155 | ||
156 | button = kzalloc(sizeof(struct surface_button), GFP_KERNEL); | |
157 | if (!button) | |
158 | return -ENOMEM; | |
159 | ||
160 | device->driver_data = button; | |
161 | button->input = input = input_allocate_device(); | |
162 | if (!input) { | |
163 | error = -ENOMEM; | |
164 | goto err_free_button; | |
165 | } | |
166 | ||
167 | name = acpi_device_name(device); | |
168 | strcpy(name, SURFACE_BUTTON_DEVICE_NAME); | |
169 | snprintf(button->phys, sizeof(button->phys), "%s/buttons", hid); | |
170 | ||
171 | input->name = name; | |
172 | input->phys = button->phys; | |
173 | input->id.bustype = BUS_HOST; | |
174 | input->dev.parent = &device->dev; | |
175 | input_set_capability(input, EV_KEY, KEY_POWER); | |
176 | input_set_capability(input, EV_KEY, KEY_LEFTMETA); | |
177 | input_set_capability(input, EV_KEY, KEY_VOLUMEUP); | |
178 | input_set_capability(input, EV_KEY, KEY_VOLUMEDOWN); | |
179 | ||
180 | error = input_register_device(input); | |
181 | if (error) | |
182 | goto err_free_input; | |
183 | dev_info(&device->dev, | |
184 | "%s [%s]\n", name, acpi_device_bid(device)); | |
185 | return 0; | |
186 | ||
187 | err_free_input: | |
188 | input_free_device(input); | |
189 | err_free_button: | |
190 | kfree(button); | |
191 | return error; | |
192 | } | |
193 | ||
194 | static int surface_button_remove(struct acpi_device *device) | |
195 | { | |
196 | struct surface_button *button = acpi_driver_data(device); | |
197 | ||
198 | input_unregister_device(button->input); | |
199 | kfree(button); | |
200 | return 0; | |
201 | } | |
202 | ||
203 | static SIMPLE_DEV_PM_OPS(surface_button_pm, | |
204 | surface_button_suspend, surface_button_resume); | |
205 | ||
206 | static struct acpi_driver surface_button_driver = { | |
207 | .name = "surface_pro3_button", | |
208 | .class = "SurfacePro3", | |
209 | .ids = surface_button_device_ids, | |
210 | .ops = { | |
211 | .add = surface_button_add, | |
212 | .remove = surface_button_remove, | |
213 | .notify = surface_button_notify, | |
214 | }, | |
215 | .drv.pm = &surface_button_pm, | |
216 | }; | |
217 | ||
218 | module_acpi_driver(surface_button_driver); |