From patchwork Sat Jan 20 21:26:45 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Duje_Mihanovi=C4=87?= X-Patchwork-Id: 13524450 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4DB66C47DAF for ; Sat, 20 Jan 2024 21:27:41 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9DC7310E37A; Sat, 20 Jan 2024 21:27:33 +0000 (UTC) Received: from mx.skole.hr (mx2.hosting.skole.hr [161.53.165.186]) by gabe.freedesktop.org (Postfix) with ESMTPS id E492210E37B for ; Sat, 20 Jan 2024 21:27:31 +0000 (UTC) Received: from mx2.hosting.skole.hr (localhost.localdomain [127.0.0.1]) by mx.skole.hr (mx.skole.hr) with ESMTP id A801786C62; Sat, 20 Jan 2024 22:27:26 +0100 (CET) From: =?utf-8?q?Duje_Mihanovi=C4=87?= Date: Sat, 20 Jan 2024 22:26:45 +0100 Subject: [PATCH v3 3/3] backlight: Add Kinetic KTD2801 backlight support MIME-Version: 1.0 Message-Id: <20240120-ktd2801-v3-3-fe2cbafffb21@skole.hr> References: <20240120-ktd2801-v3-0-fe2cbafffb21@skole.hr> In-Reply-To: <20240120-ktd2801-v3-0-fe2cbafffb21@skole.hr> To: Lee Jones , Daniel Thompson , Jingoo Han , Pavel Machek , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Helge Deller , Linus Walleij X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=openpgp-sha256; l=7161; i=duje.mihanovic@skole.hr; h=from:subject:message-id; bh=FC1EjKKMu309UuB+RKeyqY3SuL54ONyCm0c9CWTGi94=; b=owEBbQKS/ZANAwAIAZoRnrBCLZbhAcsmYgBlrDqXA8eeM1rneiarkBVOYjFzaCB2FaXFAQs9p n+qHN5uiYaJAjMEAAEIAB0WIQRT351NnD/hEPs2LXiaEZ6wQi2W4QUCZaw6lwAKCRCaEZ6wQi2W 4UJkD/4tqCl58QQWHnetlBPLGttzp8B5bT6TS+OcDmEDyNHEPkSX5ZHB0YikL/Yiy1huO4s5phO jekA5tYJjzS3OnhWWiwCpd1+cFrp+htdAsrS9ab1lwCFFR9Om6nwoSaJuQ3AhtwKH1u4qgvClnJ FzRbQcrxk1qaWJy5ssxTEMXgI0pkUZEEqUa/3JYjDj6t9rofP8DImLvoo+aGvktm72qLJssnLWF QhoPQJaL8+A5VNk4R5AJA2EcDjgAHDFyG/eJTzA0mEYC51icvdS8LQJ9pKkPQ1jA/Lrymdldfqf 7EoGK9JlUGlNnN3sqHiHAWmxe6HBWLfveV5kkjMe7AdwUwRQzUFqogMZceoOQHi9R9/ph2rga2q kL4LqZyaavvNMvaDJFO0y82q1cWLegOArF2DLT3I8yIrbmXQM4gBCKI30M63uOfwgAQIlNYnswM xAbnvJJZpObm/CRepA4Mo9upFFXXn8i0MiR8QgBO9V2xSfS+3zABMTqcgn/x2oEXth35TmqiC9D cpAe3Q6kNYwQZSHS3J5Bo19z6JIdRs9kSp7UBlhNe2P/NE4EtC21zOTyCX82d086EMg3fHHJSnN A7+Lue2TziTrHn1OHESMWw+F+ZaB2AauFVfmnOmU0J0PvAE5v0XzZ51unNvKUV/6yGg2f2da1l8 ZrdFrpCM+ld7VcA== X-Developer-Key: i=duje.mihanovic@skole.hr; a=openpgp; fpr=53DF9D4D9C3FE110FB362D789A119EB0422D96E1 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-fbdev@vger.kernel.org, =?utf-8?q?Duje_?= =?utf-8?q?Mihanovi=C4=87?= , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, ~postmarketos/upstreaming@lists.sr.ht, phone-devel@vger.kernel.org, Karel Balej , linux-leds@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" KTD2801 is a LED backlight driver IC found in samsung,coreprimevelte. The brightness can be set using PWM or the ExpressWire protocol. Add support for the KTD2801. Signed-off-by: Duje Mihanović Reviewed-by: Linus Walleij --- MAINTAINERS | 6 ++ drivers/video/backlight/Kconfig | 8 ++ drivers/video/backlight/Makefile | 1 + drivers/video/backlight/ktd2801-backlight.c | 143 ++++++++++++++++++++++++++++ 4 files changed, 158 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 87b12d2448a0..dddffbd8d2a0 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11891,6 +11891,12 @@ S: Maintained F: Documentation/devicetree/bindings/leds/backlight/kinetic,ktd253.yaml F: drivers/video/backlight/ktd253-backlight.c +KTD2801 BACKLIGHT DRIVER +M: Duje Mihanović +S: Maintained +F: Documentation/devicetree/bindings/leds/backlight/kinetic,ktd2801.yaml +F: drivers/video/backlight/ktd2801-backlight.c + KTEST M: Steven Rostedt M: John Hawley diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 51387b1ef012..585a5a713759 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -183,6 +183,14 @@ config BACKLIGHT_KTD253 which is a 1-wire GPIO-controlled backlight found in some mobile phones. +config BACKLIGHT_KTD2801 + tristate "Backlight Driver for Kinetic KTD2801" + depends on GPIOLIB || COMPILE_TEST + select LEDS_EXPRESSWIRE + help + Say Y to enable the backlight driver for the Kinetic KTD2801 1-wire + GPIO-controlled backlight found in Samsung Galaxy Core Prime VE LTE. + config BACKLIGHT_KTZ8866 tristate "Backlight Driver for Kinetic KTZ8866" depends on I2C diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index f72e1c3c59e9..b33b647f31ca 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -35,6 +35,7 @@ obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o obj-$(CONFIG_BACKLIGHT_HP700) += jornada720_bl.o obj-$(CONFIG_BACKLIGHT_IPAQ_MICRO) += ipaq_micro_bl.o obj-$(CONFIG_BACKLIGHT_KTD253) += ktd253-backlight.o +obj-$(CONFIG_BACKLIGHT_KTD2801) += ktd2801-backlight.o obj-$(CONFIG_BACKLIGHT_KTZ8866) += ktz8866.o obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_bl.o obj-$(CONFIG_BACKLIGHT_LM3630A) += lm3630a_bl.o diff --git a/drivers/video/backlight/ktd2801-backlight.c b/drivers/video/backlight/ktd2801-backlight.c new file mode 100644 index 000000000000..7b9d1a93aa71 --- /dev/null +++ b/drivers/video/backlight/ktd2801-backlight.c @@ -0,0 +1,143 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Datasheet: + * https://www.kinet-ic.com/uploads/web/KTD2801/KTD2801-04b.pdf + */ +#include +#include +#include +#include +#include +#include +#include + +/* These values have been extracted from Samsung's driver. */ +#define KTD2801_EXPRESSWIRE_DETECT_DELAY_US 150 +#define KTD2801_EXPRESSWIRE_DETECT_US 270 +#define KTD2801_SHORT_BITSET_US 5 +#define KTD2801_LONG_BITSET_US (3 * KTD2801_SHORT_BITSET_US) +#define KTD2801_DATA_START_US 5 +#define KTD2801_END_OF_DATA_LOW_US 10 +#define KTD2801_END_OF_DATA_HIGH_US 350 +#define KTD2801_PWR_DOWN_DELAY_US 2600 + +#define KTD2801_DEFAULT_BRIGHTNESS 100 +#define KTD2801_MAX_BRIGHTNESS 255 + +const struct expresswire_timing ktd2801_timing = { + .poweroff_us = KTD2801_PWR_DOWN_DELAY_US, + .detect_delay_us = KTD2801_EXPRESSWIRE_DETECT_DELAY_US, + .detect_us = KTD2801_EXPRESSWIRE_DETECT_US, + .data_start_us = KTD2801_DATA_START_US, + .short_bitset_us = KTD2801_SHORT_BITSET_US, + .long_bitset_us = KTD2801_LONG_BITSET_US, + .end_of_data_low_us = KTD2801_END_OF_DATA_LOW_US, + .end_of_data_high_us = KTD2801_END_OF_DATA_HIGH_US +}; + +struct ktd2801_backlight { + struct expresswire_common_props props; + struct backlight_device *bd; + bool was_on; +}; + +static int ktd2801_update_status(struct backlight_device *bd) +{ + struct ktd2801_backlight *ktd2801 = bl_get_data(bd); + u8 brightness = (u8) backlight_get_brightness(bd); + + if (backlight_is_blank(bd)) { + expresswire_power_off(&ktd2801->props); + ktd2801->was_on = false; + return 0; + } + + if (!ktd2801->was_on) { + expresswire_enable(&ktd2801->props); + ktd2801->was_on = true; + } + + expresswire_start(&ktd2801->props); + + for (int i = 7; i >= 0; i--) + expresswire_set_bit(&ktd2801->props, !!(brightness & BIT(i))); + + expresswire_end(&ktd2801->props); + return 0; +} + +static const struct backlight_ops ktd2801_backlight_ops = { + .update_status = ktd2801_update_status, +}; + +static int ktd2801_backlight_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct backlight_device *bd; + struct ktd2801_backlight *ktd2801; + u32 brightness, max_brightness; + int ret; + + ktd2801 = devm_kzalloc(dev, sizeof(*ktd2801), GFP_KERNEL); + if (!ktd2801) + return -ENOMEM; + ktd2801->was_on = true; + ktd2801->props.timing = ktd2801_timing; + + ret = device_property_read_u32(dev, "max-brightness", &max_brightness); + if (ret) + max_brightness = KTD2801_MAX_BRIGHTNESS; + if (max_brightness > KTD2801_MAX_BRIGHTNESS) { + dev_err(dev, "illegal max brightness specified\n"); + max_brightness = KTD2801_MAX_BRIGHTNESS; + } + + ret = device_property_read_u32(dev, "default-brightness", &brightness); + if (ret) + brightness = KTD2801_DEFAULT_BRIGHTNESS; + if (brightness > max_brightness) { + dev_err(dev, "default brightness exceeds max\n"); + brightness = max_brightness; + } + + ktd2801->props.ctrl_gpio = devm_gpiod_get(dev, "ctrl", GPIOD_OUT_HIGH); + if (IS_ERR(ktd2801->props.ctrl_gpio)) + return dev_err_probe(dev, PTR_ERR(ktd2801->props.ctrl_gpio), + "failed to get backlight GPIO"); + gpiod_set_consumer_name(ktd2801->props.ctrl_gpio, dev_name(dev)); + + bd = devm_backlight_device_register(dev, dev_name(dev), dev, ktd2801, + &ktd2801_backlight_ops, NULL); + if (IS_ERR(bd)) + return dev_err_probe(dev, PTR_ERR(bd), + "failed to register backlight"); + + bd->props.max_brightness = max_brightness; + bd->props.brightness = brightness; + + ktd2801->bd = bd; + platform_set_drvdata(pdev, bd); + backlight_update_status(bd); + + return 0; +} + +static const struct of_device_id ktd2801_of_match[] = { + { .compatible = "kinetic,ktd2801" }, + { } +}; +MODULE_DEVICE_TABLE(of, ktd2801_of_match); + +static struct platform_driver ktd2801_backlight_driver = { + .driver = { + .name = "ktd2801-backlight", + .of_match_table = ktd2801_of_match, + }, + .probe = ktd2801_backlight_probe, +}; +module_platform_driver(ktd2801_backlight_driver); + +MODULE_IMPORT_NS(EXPRESSWIRE); +MODULE_AUTHOR("Duje Mihanović "); +MODULE_DESCRIPTION("Kinetic KTD2801 Backlight Driver"); +MODULE_LICENSE("GPL");