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Date: Fri, 04 Mar 2016 10:38:24 +0100
From: Jacek Anaszewski <j.anaszewski@...sung.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Richard Purdie <rpurdie@...ys.net>, Bryan Wu <cooloney@...il.com>,
Simon Que <sque@...omium.org>,
Olof Johansson <olofj@...omium.org>,
Duncan Laurie <dlaurie@...omium.org>,
Guenter Roeck <groeck@...omium.org>,
linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH] leds: Add Chrome OS keyboard backlight LEDs driver
Hi Dmitry,
Thanks for the patch. There's already other pending version [1],
still to be decided where it should live.
[1] http://comments.gmane.org/gmane.linux.leds/4523
Best regards,
Jacek Anaszewski
On 03/04/2016 12:46 AM, Dmitry Torokhov wrote:
> From: Simon Que <sque@...omium.org>
>
> This is a driver for ACPI-based keyboard backlight LEDs found on
> Chromebooks. The driver locates \\_SB.KBLT ACPI device and exports
> backlight as "chromeos::kbd_backlight" LED class device in sysfs.
>
> Signed-off-by: Simon Que <sque@...omium.org>
> Signed-off-by: Duncan Laurie <dlaurie@...omium.org>
> Signed-off-by: Dmitry Torokhov <dtor@...omium.org>
> ---
> drivers/leds/Kconfig | 11 ++++
> drivers/leds/Makefile | 1 +
> drivers/leds/leds-chromeos-keyboard.c | 106 ++++++++++++++++++++++++++++++++++
> 3 files changed, 118 insertions(+)
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index f86527cf..02aaaf1 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -581,6 +581,17 @@ config LEDS_SN3218
> This driver can also be built as a module. If so the module
> will be called leds-sn3218.
>
> +config LEDS_CHROMEOS_KEYBOARD
> + tristate "LED backlight support for Chrome OS keyboards"
> + depends on LEDS_CLASS && ACPI
> + depends on CHROME_PLATFORMS || COMPILE_TEST
> + help
> + This option enables support for the keyboard backlight LEDs on
> + select Chrome OS systems.
> +
> + This driver can also be built as a module. If so the module
> + will be called leds-chromeos-keyboard.
> +
> comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)"
>
> config LEDS_BLINKM
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index 89c9b6f..5b96d15 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -67,6 +67,7 @@ obj-$(CONFIG_LEDS_KTD2692) += leds-ktd2692.o
> obj-$(CONFIG_LEDS_POWERNV) += leds-powernv.o
> obj-$(CONFIG_LEDS_SEAD3) += leds-sead3.o
> obj-$(CONFIG_LEDS_SN3218) += leds-sn3218.o
> +obj-$(CONFIG_LEDS_CHROMEOS_KEYBOARD) += leds-chromeos-keyboard.o
>
> # LED SPI Drivers
> obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
> diff --git a/drivers/leds/leds-chromeos-keyboard.c b/drivers/leds/leds-chromeos-keyboard.c
> new file mode 100644
> index 0000000..3592f09
> --- /dev/null
> +++ b/drivers/leds/leds-chromeos-keyboard.c
> @@ -0,0 +1,106 @@
> +/*
> + * Keyboard backlight LED driver for Chrome OS.
> + *
> + * Copyright (C) 2012 Google, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/leds.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +
> +/* Keyboard LED ACPI Device must be defined in firmware */
> +#define ACPI_KEYBOARD_BACKLIGHT_DEVICE "\\_SB.KBLT"
> +#define ACPI_KEYBOARD_BACKLIGHT_READ ACPI_KEYBOARD_BACKLIGHT_DEVICE ".KBQC"
> +#define ACPI_KEYBOARD_BACKLIGHT_WRITE ACPI_KEYBOARD_BACKLIGHT_DEVICE ".KBCM"
> +
> +#define ACPI_KEYBOARD_BACKLIGHT_MAX 100
> +
> +static void keyboard_led_set_brightness(struct led_classdev *cdev,
> + enum led_brightness brightness)
> +{
> + union acpi_object param;
> + struct acpi_object_list input;
> + acpi_status status;
> +
> + param.type = ACPI_TYPE_INTEGER;
> + param.integer.value = brightness;
> + input.count = 1;
> + input.pointer = ¶m;
> +
> + status = acpi_evaluate_object(NULL, ACPI_KEYBOARD_BACKLIGHT_WRITE,
> + &input, NULL);
> + if (ACPI_FAILURE(status))
> + dev_err(cdev->dev, "Error setting keyboard LED value: %d\n",
> + status);
> +}
> +
> +static int keyboard_led_probe(struct platform_device *pdev)
> +{
> + struct led_classdev *cdev;
> + acpi_handle handle;
> + acpi_status status;
> + int error;
> +
> + /* Look for the keyboard LED ACPI Device */
> + status = acpi_get_handle(ACPI_ROOT_OBJECT,
> + ACPI_KEYBOARD_BACKLIGHT_DEVICE,
> + &handle);
> + if (ACPI_FAILURE(status)) {
> + dev_err(&pdev->dev, "Unable to find ACPI device %s: %d\n",
> + ACPI_KEYBOARD_BACKLIGHT_DEVICE, status);
> + return -ENXIO;
> + }
> +
> + cdev = devm_kzalloc(&pdev->dev, sizeof(*cdev), GFP_KERNEL);
> + if (!cdev)
> + return -ENOMEM;
> +
> + cdev->name = "chromeos::kbd_backlight";
> + cdev->brightness_set = keyboard_led_set_brightness;
> + cdev->max_brightness = ACPI_KEYBOARD_BACKLIGHT_MAX;
> + cdev->brightness = cdev->max_brightness;
> + cdev->flags |= LED_CORE_SUSPENDRESUME;
> +
> + error = devm_led_classdev_register(&pdev->dev, cdev);
> + if (error)
> + return error;
> +
> + platform_set_drvdata(pdev, cdev);
> + return 0;
> +}
> +
> +static const struct acpi_device_id keyboard_led_id[] = {
> + { "GOOG0002", 0 },
> + { }
> +};
> +MODULE_DEVICE_TABLE(acpi, keyboard_led_id);
> +
> +static struct platform_driver keyboard_led_driver = {
> + .driver = {
> + .name = "chromeos-keyboard-leds",
> + .acpi_match_table = ACPI_PTR(keyboard_led_id),
> + },
> + .probe = keyboard_led_probe,
> +};
> +module_platform_driver(keyboard_led_driver);
> +
> +MODULE_AUTHOR("Simon Que <sque@...omium.org>");
> +MODULE_DESCRIPTION("ChromeOS Keyboard backlight LED Driver");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:chromeos-keyboard-leds");
>
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