From patchwork Thu Oct 5 18:49:08 2023 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: 729901 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DCEEDE92728 for ; Thu, 5 Oct 2023 18:55:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229596AbjJESzk (ORCPT ); Thu, 5 Oct 2023 14:55:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59400 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229656AbjJESzj (ORCPT ); Thu, 5 Oct 2023 14:55:39 -0400 X-Greylist: delayed 350 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Thu, 05 Oct 2023 11:55:38 PDT Received: from mx.skole.hr (mx1.hosting.skole.hr [161.53.165.185]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 140AC93; Thu, 5 Oct 2023 11:55:38 -0700 (PDT) Received: from mx1.hosting.skole.hr (localhost.localdomain [127.0.0.1]) by mx.skole.hr (mx.skole.hr) with ESMTP id 54BB984F75; Thu, 5 Oct 2023 20:49:48 +0200 (CEST) From: =?utf-8?q?Duje_Mihanovi=C4=87?= Date: Thu, 05 Oct 2023 20:49:08 +0200 Subject: [PATCH 1/2] dt-bindings: backlight: add Kinetic KTD2801 binding MIME-Version: 1.0 Message-Id: <20231005-ktd2801-v1-1-43cd85b0629a@skole.hr> References: <20231005-ktd2801-v1-0-43cd85b0629a@skole.hr> In-Reply-To: <20231005-ktd2801-v1-0-43cd85b0629a@skole.hr> To: Lee Jones , Daniel Thompson , Jingoo Han , Pavel Machek , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Helge Deller Cc: Karel Balej , dri-devel@lists.freedesktop.org, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org, ~postmarketos/upstreaming@lists.sr.ht, =?utf-8?q?Duje_Mihanovi=C4=87?= X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1714; i=duje.mihanovic@skole.hr; h=from:subject:message-id; bh=UdiONCDFn7tSC5O0Vn6kl8sVoN7CSUp9mQWdTvRQG54=; b=owEBbQKS/ZANAwAIAZoRnrBCLZbhAcsmYgBlHwVCfv22qJGXGxy+4xw0vT+90XZOJv8VbwEA1 upnGjCeI6eJAjMEAAEIAB0WIQRT351NnD/hEPs2LXiaEZ6wQi2W4QUCZR8FQgAKCRCaEZ6wQi2W 4RKXD/9XfqrqI9hIeLFo4dL2yYC+GvW8XRQw3ij9ldGmH5vDRakMYYgMM3RjG204uN3bQO9yPjJ AIZnmONSC6fEjx3EgOBYvhNaa4sxxDsh7LwUvIbQeIQ+eZZVRS6YusOguR3xv+vvr1SJ8UrPGas 60idqG69zQjXVnoBK3lVlzZKQlBBlyRXyzoBJOgvB+T0s9/jT/2IqEXnS+i6EM7M2+werN3lGo+ lunZHJmuTmWuOrr1yKi4YaxE5h8uPToiALQdwfuU6TSwcdP0hi92LpAVE4p51KYB74pFKXm1IXQ FaIUFk+NmvntQR8P/sGc4CNlN21LmpJ/D6wxIIXxmrmrFYnqOMqJwIvDKhjkAxsJD/sTwEh2A6s P/UBNpCfl3iCqAZP//0qZ9EzVfEBrafl0pqlKWkEkY9K1YP8L3uujyxgDMfoHaWvnggeGAEQs9u ksij04LIVR1XFIlDtfgx+NZ5sspmDjWKLpXiw/JdMzDAEeZexNnwa0NmZyeiahubRIaXAnvZLy2 bt0df+oNz7ackb4gSEVOitqw0g5IjN/TZEeJKxobJq3RUg0ErGS7xljASaIqMkaLkVJ3xHrCYJq eXsYYDr/sKW8S7VYFNtzeVYfMX01hfx/NxCrCSCVd+WkT7Dby2gzwQMk7zZVHxwFFKWpgjmX6BH SU0bAmrwbsBOFag== X-Developer-Key: i=duje.mihanovic@skole.hr; a=openpgp; fpr=53DF9D4D9C3FE110FB362D789A119EB0422D96E1 Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org Add the dt binding for the Kinetic KTD2801 backlight driver. Signed-off-by: Duje Mihanović Reviewed-by: Krzysztof Kozlowski --- .../bindings/leds/backlight/kinetic,ktd2801.yaml | 46 ++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/Documentation/devicetree/bindings/leds/backlight/kinetic,ktd2801.yaml b/Documentation/devicetree/bindings/leds/backlight/kinetic,ktd2801.yaml new file mode 100644 index 000000000000..970d54bac18e --- /dev/null +++ b/Documentation/devicetree/bindings/leds/backlight/kinetic,ktd2801.yaml @@ -0,0 +1,46 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/leds/backlight/kinetic,ktd2801.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Kinetic Technologies KTD2801 one-wire backlight + +maintainers: + - Duje Mihanović + +description: | + The Kinetic Technologies KTD2801 is a LED backlight driver controlled + by a single GPIO line. The driver can be controlled with a PWM signal + or by pulsing the GPIO line to set the backlight level. This is called + "ExpressWire". + +allOf: + - $ref: common.yaml# + +properties: + compatible: + const: kinetic,ktd2801 + + enable-gpios: + maxItems: 1 + + default-brightness: true + max-brightness: true + +required: + - compatible + - enable-gpios + +additionalProperties: false + +examples: + - | + #include + + backlight { + compatible = "kinetic,ktd2801"; + enable-gpios = <&gpio 97 GPIO_ACTIVE_LOW>; + max-brightness = <210>; + default-brightness = <100>; + }; From patchwork Thu Oct 5 18:49:09 2023 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: 729900 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CD3A6E9272C for ; Thu, 5 Oct 2023 18:57:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231963AbjJES5U (ORCPT ); Thu, 5 Oct 2023 14:57:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41370 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231899AbjJES5R (ORCPT ); Thu, 5 Oct 2023 14:57:17 -0400 Received: from mx.skole.hr (mx2.hosting.skole.hr [161.53.165.186]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7F025D6; Thu, 5 Oct 2023 11:57:12 -0700 (PDT) Received: from mx2.hosting.skole.hr (localhost.localdomain [127.0.0.1]) by mx.skole.hr (mx.skole.hr) with ESMTP id 1A9D58635B; Thu, 5 Oct 2023 20:49:48 +0200 (CEST) From: =?utf-8?q?Duje_Mihanovi=C4=87?= Date: Thu, 05 Oct 2023 20:49:09 +0200 Subject: [PATCH 2/2] backlight: Add Kinetic KTD2801 driver MIME-Version: 1.0 Message-Id: <20231005-ktd2801-v1-2-43cd85b0629a@skole.hr> References: <20231005-ktd2801-v1-0-43cd85b0629a@skole.hr> In-Reply-To: <20231005-ktd2801-v1-0-43cd85b0629a@skole.hr> To: Lee Jones , Daniel Thompson , Jingoo Han , Pavel Machek , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Helge Deller Cc: Karel Balej , dri-devel@lists.freedesktop.org, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org, ~postmarketos/upstreaming@lists.sr.ht, =?utf-8?q?Duje_Mihanovi=C4=87?= X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=6777; i=duje.mihanovic@skole.hr; h=from:subject:message-id; bh=aBBnS1XZnXv76Hv6XBS+QCbv+h+s/Wh7qXIwLBioodk=; b=owEBbQKS/ZANAwAIAZoRnrBCLZbhAcsmYgBlHwVCHOlK47dVdMIuw8iHIb9VR7ioJlIpKVkcF sp+p1BaZv+JAjMEAAEIAB0WIQRT351NnD/hEPs2LXiaEZ6wQi2W4QUCZR8FQgAKCRCaEZ6wQi2W 4Qb3D/9XJX34c37Ey93a56OrsyQXnw0RkbolK6On8eELGebAItBFIgAY00gXbAU/ktEcX9bJxQB NvqToszGEDBlwoBGBVULzIBaeUpeCgrIlxiJ3ULkG2MSNtEAuvp4g72OReHBKEo5V7eJzavze2j KL0uM1f1jwvNHZ3Hzu6f+FnduxmB024+6Tvb6NaWNhZAvTXPWHi3JHe/cHI7RbJP/AC33tTKgz0 WxaEhoFiRLeZz9kaQpwnYKRb0eB1rk5GRoS6cWVeWVEv9NJEUpG7M7+JSsycQVzhD4tIUOF/f4b t9HXUHKJAs1FN4I/vkbdsq23RgBTZvmj3+76uc4mI+kZQkLD1ZAVksvMaX8OsJpHPkKzJ1zbmj+ 5TqQR4XxGUXcWvvas9PWx0C29jXghHpgt3dVpVvYquAb5PWXMWLMbUXKPhzZobMJK4KnO/j6MVt dLPmUTcL0Rkh5ysrZX0YWtcitawtRrscLOxvJy1uObdxqk8iT9ZdUgcH8hpfh6xMaOHEQ7kGCdI uKuGui2O4vc2rYlmWJ1ZTK8Pc16Y0l09LcHoz0GVEuwcnJSRLlpz269CS2if06s4MXucwSBMr84 8hsUqmpz/9rT4Gtzl5vDls4e10ZZZWNEiXAiNhC76MR1r3vUc5JR2y9Qwo/yIFTcH1xD8OJPJ77 dIVWNGgdPgmLfjA== X-Developer-Key: i=duje.mihanovic@skole.hr; a=openpgp; fpr=53DF9D4D9C3FE110FB362D789A119EB0422D96E1 Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org Add driver for the Kinetic KTD2801 backlight driver. Signed-off-by: Duje Mihanović --- MAINTAINERS | 6 ++ drivers/video/backlight/Kconfig | 7 ++ drivers/video/backlight/Makefile | 1 + drivers/video/backlight/ktd2801-backlight.c | 151 ++++++++++++++++++++++++++++ 4 files changed, 165 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 35977b269d5e..7da78f06a65d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11777,6 +11777,12 @@ 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..a2b268293345 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -183,6 +183,13 @@ 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 + 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..24a5f9e5d606 --- /dev/null +++ b/drivers/video/backlight/ktd2801-backlight.c @@ -0,0 +1,151 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include +#include +#include +#include + +#define EW_DELAY 150 +#define EW_DET 270 +#define LOW_BIT_HIGH 5 +#define LOW_BIT_LOW (4 * HIGH_BIT_LOW) +#define HIGH_BIT_LOW 5 +#define HIGH_BIT_HIGH (4 * HIGH_BIT_LOW) +#define DS 5 +#define EOD_L 10 +#define EOD_H 350 +#define PWR_DOWN_DELAY 2600 + +#define KTD2801_DEFAULT_BRIGHTNESS 100 +#define KTD2801_MAX_BRIGHTNESS 255 + +struct ktd2801_backlight { + struct device *dev; + struct backlight_device *bd; + struct gpio_desc *desc; + 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)) { + gpiod_set_value(ktd2801->desc, 1); + udelay(PWR_DOWN_DELAY); + ktd2801->was_on = false; + return 0; + } + + if (!ktd2801->was_on) { + gpiod_set_value(ktd2801->desc, 0); + udelay(EW_DELAY); + gpiod_set_value(ktd2801->desc, 1); + udelay(EW_DET); + gpiod_set_value(ktd2801->desc, 0); + ktd2801->was_on = true; + } + + gpiod_set_value(ktd2801->desc, 0); + udelay(DS); + + for (int i = 0; i < 8; i++) { + u8 next_bit = (brightness & 0x80) >> 7; + + if (!next_bit) { + gpiod_set_value(ktd2801->desc, 1); + udelay(LOW_BIT_LOW); + gpiod_set_value(ktd2801->desc, 0); + udelay(LOW_BIT_HIGH); + } else { + gpiod_set_value(ktd2801->desc, 1); + udelay(HIGH_BIT_LOW); + gpiod_set_value(ktd2801->desc, 0); + udelay(HIGH_BIT_HIGH); + } + brightness <<= 1; + } + gpiod_set_value(ktd2801->desc, 1); + udelay(EOD_L); + gpiod_set_value(ktd2801->desc, 0); + udelay(EOD_H); + 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->dev = dev; + ktd2801->was_on = true; + + 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->desc = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW); + if (IS_ERR(ktd2801->desc)) + return dev_err_probe(dev, PTR_ERR(ktd2801->desc), + "failed to get backlight GPIO"); + gpiod_set_consumer_name(ktd2801->desc, 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_AUTHOR("Duje Mihanović "); +MODULE_DESCRIPTION("Kinetic KTD2801 Backlight Driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:ktd2801-backlight");