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