[1/3] Input: export LEDs as class devices in sysfs

Message ID	1433799790-31873-2-git-send-email-dmitry.torokhov@gmail.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-input-owner@kernel.org> From: Dmitry Torokhov <dmitry.torokhov@gmail.com> To: Samuel Thibault <samuel.thibault@ens-lyon.org>, Pavel Machek <pavel@ucw.cz>, =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali.rohar@gmail.com> Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, rpurdie@rpsys.net, Greg Kroah-Hartman <gregkh@linuxfoundation.org> Subject: [PATCH 1/3] Input: export LEDs as class devices in sysfs Date: Mon, 8 Jun 2015 14:43:08 -0700 Message-Id: <1433799790-31873-2-git-send-email-dmitry.torokhov@gmail.com> In-Reply-To: <1433799790-31873-1-git-send-email-dmitry.torokhov@gmail.com> References: <1433799790-31873-1-git-send-email-dmitry.torokhov@gmail.com> Sender: linux-input-owner@vger.kernel.org Precedence: bulk

diff --git a/Documentation/leds/leds-class.txt b/Documentation/leds/leds-class.txt index 79699c2..62261c0 100644 --- a/Documentation/leds/leds-class.txt +++ b/Documentation/leds/leds-class.txt @@ -2,9 +2,6 @@ LED handling under Linux ======================== -If you're reading this and thinking about keyboard leds, these are -handled by the input subsystem and the led class is *not* needed. - In its simplest form, the LED class just allows control of LEDs from userspace. LEDs appear in /sys/class/leds/. The maximum brightness of the LED is defined in max_brightness file. The brightness file will set the brightness diff --git a/drivers/input/Kconfig b/drivers/input/Kconfig index a11ff74..a35532e 100644 --- a/drivers/input/Kconfig +++ b/drivers/input/Kconfig @@ -25,6 +25,19 @@ config INPUT if INPUT +config INPUT_LEDS + tristate "Export input device LEDs in sysfs" + depends on LEDS_CLASS + default INPUT + help + Say Y here if you would like to export LEDs on input devices + as standard LED class devices in sysfs. + + If unsure, say Y. + + To compile this driver as a module, choose M here: the + module will be called input-leds. + config INPUT_FF_MEMLESS tristate "Support for memoryless force-feedback devices" help diff --git a/drivers/input/Makefile b/drivers/input/Makefile index 5ca3f63..0c9302c 100644 --- a/drivers/input/Makefile +++ b/drivers/input/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_INPUT_POLLDEV) += input-polldev.o obj-$(CONFIG_INPUT_SPARSEKMAP) += sparse-keymap.o obj-$(CONFIG_INPUT_MATRIXKMAP) += matrix-keymap.o +obj-$(CONFIG_INPUT_LEDS) += input-leds.o obj-$(CONFIG_INPUT_MOUSEDEV) += mousedev.o obj-$(CONFIG_INPUT_JOYDEV) += joydev.o obj-$(CONFIG_INPUT_EVDEV) += evdev.o diff --git a/drivers/input/input-leds.c b/drivers/input/input-leds.c new file mode 100644 index 0000000..029a004 --- /dev/null +++ b/drivers/input/input-leds.c @@ -0,0 +1,210 @@ +/* + * LED support for the input layer + * + * Copyright 2010-2015 Samuel Thibault <samuel.thibault@ens-lyon.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#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 + +static const struct { + const char *name; + const char *trigger; +} input_led_info[LED_CNT] = { + [LED_NUML] = { "num-lock", VT_TRIGGER("kbd-numlock") }, + [LED_CAPSL] = { "caps-lock", VT_TRIGGER("kbd-capslock") }, + [LED_SCROLLL] = { "scroll-lock", VT_TRIGGER("kbd-scrollock") }, + [LED_COMPOSE] = { "compose" }, + [LED_KANA] = { "kana", VT_TRIGGER("kbd-kanalock") }, + [LED_SLEEP] = { "sleep" } , + [LED_SUSPEND] = { "suspend" }, + [LED_MUTE] = { "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[]; +}; + +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->ledbit) ? LED_FULL : LED_OFF; +} + +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_connect(struct input_handler *handler, + struct input_dev *dev, + const struct input_device_id *id) +{ + struct input_leds *leds; + unsigned int num_leds; + int led_no = 0; + int led_code; + int error; + + num_leds = bitmap_weight(dev->ledbit, LED_CNT); + if (!num_leds) + return -ENXIO; + + leds = kzalloc(sizeof(*leds) + num_leds * sizeof(*leds->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; + + for_each_set_bit(led_code, dev->ledbit, LED_CNT) { + struct input_led *led = &leds->leds[led_no]; + + led->handle = &leds->handle; + led->code = led_code; + + if (WARN_ON(!input_led_info[led_code].name)) + continue; + + 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.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"); diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 966b960..4191614 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -11,9 +11,6 @@ menuconfig NEW_LEDS Say Y to enable Linux LED support. This allows control of supported LEDs from both userspace and optionally, by kernel events (triggers). - This is not related to standard keyboard LEDs which are controlled - via the input system. - if NEW_LEDS config LEDS_CLASS

[1/3] Input: export LEDs as class devices in sysfs

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