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f60c8ba7 ST |
1 | /* |
2 | * LED support for the input layer | |
3 | * | |
4 | * Copyright 2010-2015 Samuel Thibault <samuel.thibault@ens-lyon.org> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/leds.h> | |
16 | #include <linux/input.h> | |
17 | ||
18 | #if IS_ENABLED(CONFIG_VT) | |
19 | #define VT_TRIGGER(_name) .trigger = _name | |
20 | #else | |
21 | #define VT_TRIGGER(_name) .trigger = NULL | |
22 | #endif | |
23 | ||
24 | static const struct { | |
25 | const char *name; | |
26 | const char *trigger; | |
27 | } input_led_info[LED_CNT] = { | |
28 | [LED_NUML] = { "numlock", VT_TRIGGER("kbd-numlock") }, | |
29 | [LED_CAPSL] = { "capslock", VT_TRIGGER("kbd-capslock") }, | |
30 | [LED_SCROLLL] = { "scrolllock", VT_TRIGGER("kbd-scrolllock") }, | |
31 | [LED_COMPOSE] = { "compose" }, | |
32 | [LED_KANA] = { "kana", VT_TRIGGER("kbd-kanalock") }, | |
33 | [LED_SLEEP] = { "sleep" } , | |
34 | [LED_SUSPEND] = { "suspend" }, | |
35 | [LED_MUTE] = { "mute" }, | |
36 | [LED_MISC] = { "misc" }, | |
37 | [LED_MAIL] = { "mail" }, | |
38 | [LED_CHARGING] = { "charging" }, | |
39 | }; | |
40 | ||
41 | struct input_led { | |
42 | struct led_classdev cdev; | |
43 | struct input_handle *handle; | |
44 | unsigned int code; /* One of LED_* constants */ | |
45 | }; | |
46 | ||
47 | struct input_leds { | |
48 | struct input_handle handle; | |
49 | unsigned int num_leds; | |
50 | struct input_led leds[]; | |
51 | }; | |
52 | ||
53 | static enum led_brightness input_leds_brightness_get(struct led_classdev *cdev) | |
54 | { | |
55 | struct input_led *led = container_of(cdev, struct input_led, cdev); | |
56 | struct input_dev *input = led->handle->dev; | |
57 | ||
58 | return test_bit(led->code, input->led) ? cdev->max_brightness : 0; | |
59 | } | |
60 | ||
61 | static void input_leds_brightness_set(struct led_classdev *cdev, | |
62 | enum led_brightness brightness) | |
63 | { | |
64 | struct input_led *led = container_of(cdev, struct input_led, cdev); | |
65 | ||
66 | input_inject_event(led->handle, EV_LED, led->code, !!brightness); | |
67 | } | |
68 | ||
69 | static void input_leds_event(struct input_handle *handle, unsigned int type, | |
70 | unsigned int code, int value) | |
71 | { | |
72 | } | |
73 | ||
74 | static int input_leds_connect(struct input_handler *handler, | |
75 | struct input_dev *dev, | |
76 | const struct input_device_id *id) | |
77 | { | |
78 | struct input_leds *leds; | |
79 | unsigned int num_leds; | |
80 | unsigned int led_code; | |
81 | int led_no; | |
82 | int error; | |
83 | ||
84 | num_leds = bitmap_weight(dev->ledbit, LED_CNT); | |
85 | if (!num_leds) | |
86 | return -ENXIO; | |
87 | ||
88 | leds = kzalloc(sizeof(*leds) + num_leds * sizeof(*leds->leds), | |
89 | GFP_KERNEL); | |
90 | if (!leds) | |
91 | return -ENOMEM; | |
92 | ||
93 | leds->num_leds = num_leds; | |
94 | ||
95 | leds->handle.dev = dev; | |
96 | leds->handle.handler = handler; | |
97 | leds->handle.name = "leds"; | |
98 | leds->handle.private = leds; | |
99 | ||
100 | error = input_register_handle(&leds->handle); | |
101 | if (error) | |
102 | goto err_free_mem; | |
103 | ||
104 | error = input_open_device(&leds->handle); | |
105 | if (error) | |
106 | goto err_unregister_handle; | |
107 | ||
108 | led_no = 0; | |
109 | for_each_set_bit(led_code, dev->ledbit, LED_CNT) { | |
110 | struct input_led *led = &leds->leds[led_no]; | |
111 | ||
112 | led->handle = &leds->handle; | |
113 | led->code = led_code; | |
114 | ||
115 | if (WARN_ON(!input_led_info[led_code].name)) | |
116 | continue; | |
117 | ||
118 | led->cdev.name = kasprintf(GFP_KERNEL, "%s::%s", | |
119 | dev_name(&dev->dev), | |
120 | input_led_info[led_code].name); | |
121 | if (!led->cdev.name) { | |
122 | error = -ENOMEM; | |
123 | goto err_unregister_leds; | |
124 | } | |
125 | ||
126 | led->cdev.max_brightness = 1; | |
127 | led->cdev.brightness_get = input_leds_brightness_get; | |
128 | led->cdev.brightness_set = input_leds_brightness_set; | |
129 | led->cdev.default_trigger = input_led_info[led_code].trigger; | |
130 | ||
131 | error = led_classdev_register(&dev->dev, &led->cdev); | |
132 | if (error) { | |
133 | dev_err(&dev->dev, "failed to register LED %s: %d\n", | |
134 | led->cdev.name, error); | |
135 | kfree(led->cdev.name); | |
136 | goto err_unregister_leds; | |
137 | } | |
138 | ||
139 | led_no++; | |
140 | } | |
141 | ||
142 | return 0; | |
143 | ||
144 | err_unregister_leds: | |
145 | while (--led_no >= 0) { | |
146 | struct input_led *led = &leds->leds[led_no]; | |
147 | ||
148 | led_classdev_unregister(&led->cdev); | |
149 | kfree(led->cdev.name); | |
150 | } | |
151 | ||
152 | input_close_device(&leds->handle); | |
153 | ||
154 | err_unregister_handle: | |
155 | input_unregister_handle(&leds->handle); | |
156 | ||
157 | err_free_mem: | |
158 | kfree(leds); | |
159 | return error; | |
160 | } | |
161 | ||
162 | static void input_leds_disconnect(struct input_handle *handle) | |
163 | { | |
164 | struct input_leds *leds = handle->private; | |
165 | int i; | |
166 | ||
167 | for (i = 0; i < leds->num_leds; i++) { | |
168 | struct input_led *led = &leds->leds[i]; | |
169 | ||
170 | led_classdev_unregister(&led->cdev); | |
171 | kfree(led->cdev.name); | |
172 | } | |
173 | ||
174 | input_close_device(handle); | |
175 | input_unregister_handle(handle); | |
176 | ||
177 | kfree(leds); | |
178 | } | |
179 | ||
180 | static const struct input_device_id input_leds_ids[] = { | |
181 | { | |
182 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT, | |
183 | .evbit = { BIT_MASK(EV_LED) }, | |
184 | }, | |
185 | { }, | |
186 | }; | |
187 | MODULE_DEVICE_TABLE(input, input_leds_ids); | |
188 | ||
189 | static struct input_handler input_leds_handler = { | |
190 | .event = input_leds_event, | |
191 | .connect = input_leds_connect, | |
192 | .disconnect = input_leds_disconnect, | |
193 | .name = "leds", | |
194 | .id_table = input_leds_ids, | |
195 | }; | |
196 | ||
197 | static int __init input_leds_init(void) | |
198 | { | |
199 | return input_register_handler(&input_leds_handler); | |
200 | } | |
201 | module_init(input_leds_init); | |
202 | ||
203 | static void __exit input_leds_exit(void) | |
204 | { | |
205 | input_unregister_handler(&input_leds_handler); | |
206 | } | |
207 | module_exit(input_leds_exit); | |
208 | ||
209 | MODULE_AUTHOR("Samuel Thibault <samuel.thibault@ens-lyon.org>"); | |
210 | MODULE_AUTHOR("Dmitry Torokhov <dmitry.torokhov@gmail.com>"); | |
211 | MODULE_DESCRIPTION("Input -> LEDs Bridge"); | |
212 | MODULE_LICENSE("GPL v2"); |