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220 lines
5.0 KiB
220 lines
5.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* LED support for the input layer |
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* |
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* Copyright 2010-2015 Samuel Thibault <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/leds.h> |
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#include <linux/input.h> |
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#if IS_ENABLED(CONFIG_VT) |
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#define VT_TRIGGER(_name) .trigger = _name |
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#else |
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#define VT_TRIGGER(_name) .trigger = NULL |
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#endif |
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static const struct { |
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const char *name; |
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const char *trigger; |
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} input_led_info[LED_CNT] = { |
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[LED_NUML] = { "numlock", VT_TRIGGER("kbd-numlock") }, |
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[LED_CAPSL] = { "capslock", VT_TRIGGER("kbd-capslock") }, |
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[LED_SCROLLL] = { "scrolllock", VT_TRIGGER("kbd-scrolllock") }, |
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[LED_COMPOSE] = { "compose" }, |
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[LED_KANA] = { "kana", VT_TRIGGER("kbd-kanalock") }, |
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[LED_SLEEP] = { "sleep" } , |
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[LED_SUSPEND] = { "suspend" }, |
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[LED_MUTE] = { "mute" }, |
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[LED_MISC] = { "misc" }, |
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[LED_MAIL] = { "mail" }, |
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[LED_CHARGING] = { "charging" }, |
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}; |
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struct input_led { |
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struct led_classdev cdev; |
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struct input_handle *handle; |
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unsigned int code; /* One of LED_* constants */ |
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}; |
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struct input_leds { |
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struct input_handle handle; |
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unsigned int num_leds; |
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struct input_led leds[]; |
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}; |
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static enum led_brightness input_leds_brightness_get(struct led_classdev *cdev) |
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{ |
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struct input_led *led = container_of(cdev, struct input_led, cdev); |
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struct input_dev *input = led->handle->dev; |
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return test_bit(led->code, input->led) ? cdev->max_brightness : 0; |
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} |
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static void input_leds_brightness_set(struct led_classdev *cdev, |
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enum led_brightness brightness) |
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{ |
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struct input_led *led = container_of(cdev, struct input_led, cdev); |
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input_inject_event(led->handle, EV_LED, led->code, !!brightness); |
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} |
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static void input_leds_event(struct input_handle *handle, unsigned int type, |
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unsigned int code, int value) |
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{ |
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} |
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static int input_leds_get_count(struct input_dev *dev) |
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{ |
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unsigned int led_code; |
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int count = 0; |
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for_each_set_bit(led_code, dev->ledbit, LED_CNT) |
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if (input_led_info[led_code].name) |
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count++; |
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return count; |
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} |
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static int input_leds_connect(struct input_handler *handler, |
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struct input_dev *dev, |
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const struct input_device_id *id) |
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{ |
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struct input_leds *leds; |
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struct input_led *led; |
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unsigned int num_leds; |
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unsigned int led_code; |
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int led_no; |
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int error; |
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num_leds = input_leds_get_count(dev); |
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if (!num_leds) |
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return -ENXIO; |
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leds = kzalloc(struct_size(leds, leds, num_leds), GFP_KERNEL); |
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if (!leds) |
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return -ENOMEM; |
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leds->num_leds = num_leds; |
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leds->handle.dev = dev; |
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leds->handle.handler = handler; |
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leds->handle.name = "leds"; |
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leds->handle.private = leds; |
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error = input_register_handle(&leds->handle); |
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if (error) |
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goto err_free_mem; |
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error = input_open_device(&leds->handle); |
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if (error) |
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goto err_unregister_handle; |
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led_no = 0; |
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for_each_set_bit(led_code, dev->ledbit, LED_CNT) { |
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if (!input_led_info[led_code].name) |
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continue; |
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led = &leds->leds[led_no]; |
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led->handle = &leds->handle; |
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led->code = led_code; |
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led->cdev.name = kasprintf(GFP_KERNEL, "%s::%s", |
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dev_name(&dev->dev), |
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input_led_info[led_code].name); |
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if (!led->cdev.name) { |
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error = -ENOMEM; |
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goto err_unregister_leds; |
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} |
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led->cdev.max_brightness = 1; |
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led->cdev.brightness_get = input_leds_brightness_get; |
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led->cdev.brightness_set = input_leds_brightness_set; |
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led->cdev.default_trigger = input_led_info[led_code].trigger; |
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error = led_classdev_register(&dev->dev, &led->cdev); |
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if (error) { |
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dev_err(&dev->dev, "failed to register LED %s: %d\n", |
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led->cdev.name, error); |
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kfree(led->cdev.name); |
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goto err_unregister_leds; |
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} |
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led_no++; |
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} |
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return 0; |
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err_unregister_leds: |
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while (--led_no >= 0) { |
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struct input_led *led = &leds->leds[led_no]; |
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led_classdev_unregister(&led->cdev); |
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kfree(led->cdev.name); |
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} |
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input_close_device(&leds->handle); |
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err_unregister_handle: |
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input_unregister_handle(&leds->handle); |
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err_free_mem: |
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kfree(leds); |
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return error; |
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} |
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static void input_leds_disconnect(struct input_handle *handle) |
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{ |
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struct input_leds *leds = handle->private; |
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int i; |
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for (i = 0; i < leds->num_leds; i++) { |
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struct input_led *led = &leds->leds[i]; |
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led_classdev_unregister(&led->cdev); |
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kfree(led->cdev.name); |
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} |
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input_close_device(handle); |
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input_unregister_handle(handle); |
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kfree(leds); |
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} |
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static const struct input_device_id input_leds_ids[] = { |
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{ |
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT, |
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.evbit = { BIT_MASK(EV_LED) }, |
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}, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(input, input_leds_ids); |
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static struct input_handler input_leds_handler = { |
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.event = input_leds_event, |
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.connect = input_leds_connect, |
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.disconnect = input_leds_disconnect, |
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.name = "leds", |
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.id_table = input_leds_ids, |
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}; |
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static int __init input_leds_init(void) |
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{ |
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return input_register_handler(&input_leds_handler); |
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} |
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module_init(input_leds_init); |
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static void __exit input_leds_exit(void) |
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{ |
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input_unregister_handler(&input_leds_handler); |
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} |
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module_exit(input_leds_exit); |
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MODULE_AUTHOR("Samuel Thibault <[email protected]>"); |
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MODULE_AUTHOR("Dmitry Torokhov <[email protected]>"); |
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MODULE_DESCRIPTION("Input -> LEDs Bridge"); |
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MODULE_LICENSE("GPL v2");
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