From patchwork Fri Jan 20 12:38:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jianhua Lu X-Patchwork-Id: 13110362 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 318ADC05027 for ; Fri, 20 Jan 2023 18:20:11 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 18B8010EABC; Fri, 20 Jan 2023 18:19:47 +0000 (UTC) Received: from mail-pj1-x102c.google.com (mail-pj1-x102c.google.com [IPv6:2607:f8b0:4864:20::102c]) by gabe.freedesktop.org (Postfix) with ESMTPS id DCAB410EA52 for ; Fri, 20 Jan 2023 12:39:12 +0000 (UTC) Received: by mail-pj1-x102c.google.com with SMTP id y3-20020a17090a390300b00229add7bb36so4751992pjb.4 for ; Fri, 20 Jan 2023 04:39:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=LbrTw8q0FYWcgyqiGLW/S6PKzzVmyAxVa5ipE2Zw0iw=; b=cD/lNMUjPMBxUVzQDFEF2mim04zKBppR051Qicl7OaEe2twsixhdOhmV53N8HVoTbn XOe5YLFaKXRyMQ/g1NlfIafSC7FPlh59Xq8ko34riY9g5gZQXJiphi5ELxlaItwshQaE jIE4yLK0q/xepm4GaH4vLVJ+LuzckjhwY+2MbMHryTvZo8PuCt9l9a2v2GKtYB/OPu8w WrT6SfVSFBSXaMip2hR3bQ2ldwONob/puUUW67sM40ZforgjIR0JRHq7pWkdSp4BIulI 8gele0EwMLiFO2H+9vgYDm14hgYeNZmHu2p8HrdjCorJYHzL9kVsv8oqJAygteBpfJj0 LPrA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=LbrTw8q0FYWcgyqiGLW/S6PKzzVmyAxVa5ipE2Zw0iw=; b=kVjqneUsmuMeVxmyXeNw344AlUBrOSk1OiLUa56ykELQMROgLtwP6koGcd2ty82hP4 lwN5ki/ywmM55znvQdBwJsH30ddxc6iwXd2My9ZPwjae7qdfS3/Jzvz+ZM9YG3SqNJTa 3FftGcXyRDQL2T3IiyRquctHs/TJuRN8gAqQjmoYtMr0n3H+5jKqRDO0YbN31+xuCdXv kozSFAZNV/jEXLKD/OjmIvgpqwaIbETCakGO+5pn5MoR24vLNcY67M72nSjaujUbs4cq 94wDpIWb+j0CkRvb+oJh99k3NhXtF7KmRoLJLsTsmDOX6pNLVFOyafiNQeY2wPAmwiVN nbHw== X-Gm-Message-State: AFqh2kp6mgKlWWIpY1Uq964YRxauo3fhqPGh7UIO8f1mLq5IZq0u0sys YHIRIYWuYskc2EhzeiKlOFA= X-Google-Smtp-Source: AMrXdXvn5FWoGnUPfZD9Nj1BMQyZeHI2km0g9KQnN5hq4QTbRl7ZVK+CxfZpSDb7j3MfdFjWl0Dnww== X-Received: by 2002:a17:90a:1285:b0:229:679b:bf9c with SMTP id g5-20020a17090a128500b00229679bbf9cmr16065577pja.9.1674218352446; Fri, 20 Jan 2023 04:39:12 -0800 (PST) Received: from localhost.localdomain (n220246252084.netvigator.com. [220.246.252.84]) by smtp.gmail.com with ESMTPSA id p23-20020a17090a0e5700b002271b43e528sm1131044pja.33.2023.01.20.04.39.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Jan 2023 04:39:12 -0800 (PST) From: Jianhua Lu To: Lee Jones , Daniel Thompson , Jingoo Han , Pavel Machek , Rob Herring , Krzysztof Kozlowski , Helge Deller Subject: [PATCH v8 2/2] backlight: ktz8866: Add support for Kinetic KTZ8866 backlight Date: Fri, 20 Jan 2023 20:38:57 +0800 Message-Id: <20230120123857.16124-2-lujianhua000@gmail.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230120123857.16124-1-lujianhua000@gmail.com> References: <20230120123857.16124-1-lujianhua000@gmail.com> MIME-Version: 1.0 X-Mailman-Approved-At: Fri, 20 Jan 2023 18:19:29 +0000 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, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Jianhua Lu , linux-leds@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add support for Kinetic KTZ8866 backlight, which is used in Xiaomi tablet, Mi Pad 5 series. This driver lightly based on downstream implementation [1]. [1] https://github.com/MiCode/Xiaomi_Kernel_OpenSource/blob/elish-r-oss/drivers/video/backlight/ktz8866.c Signed-off-by: Jianhua Lu --- Changes in v2: - Add missing staitc modifier to ktz8866_write function. Changes in v3: - Add 2022 to Copyright line. - Sort headers. - Remove meaningless comment. - Use definitions instead of hardcoding. - Add missing maintainer info. Changes in v4: - Change 2022 to 2023. - Remove useless macro and enum. - Describe settings by devicetree. - Move header file to C file. Changes in v5: - Change "2023" to "2022, 2023" in Copyright line. - Set scale property for backlight. Changes in v6: - Correct devicetree property name. Changes in v7: - Remove unnecessary sleep statement. - Fix code style. - Add vddpos and vddneg supply devicetree parse. - Add enabel-gpio devicetree parse. Changes in v8: - Modify devicetree parse according to dt bindings. MAINTAINERS | 6 + drivers/video/backlight/Kconfig | 8 ++ drivers/video/backlight/Makefile | 1 + drivers/video/backlight/ktz8866.c | 209 ++++++++++++++++++++++++++++++ 4 files changed, 224 insertions(+) create mode 100644 drivers/video/backlight/ktz8866.c diff --git a/MAINTAINERS b/MAINTAINERS index 42fc47c6edfd..2084e74e1b58 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11674,6 +11674,12 @@ M: John Hawley S: Maintained F: tools/testing/ktest +KTZ8866 BACKLIGHT DRIVER +M: Jianhua Lu +S: Maintained +F: Documentation/devicetree/bindings/leds/backlight/kinetic,ktz8866.yaml +F: drivers/video/backlight/ktz8866.c + L3MDEV M: David Ahern L: netdev@vger.kernel.org diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 936ba1e4d35e..f7113ceb264a 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -190,6 +190,14 @@ config BACKLIGHT_KTD253 which is a 1-wire GPIO-controlled backlight found in some mobile phones. +config BACKLIGHT_KTZ8866 + tristate "Backlight Driver for Kinetic KTZ8866" + depends on I2C + select REGMAP_I2C + help + Say Y to enable the backlight driver for the Kinetic KTZ8866 + found in Xiaomi Mi Pad 5 series. + config BACKLIGHT_LM3533 tristate "Backlight Driver for LM3533" depends on MFD_LM3533 diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index e815f3f1deff..f70a819c304c 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -36,6 +36,7 @@ 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-$(CONFIG_BACKLIGHT_KTZ8866) += ktz8866.o obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_bl.o obj-$(CONFIG_BACKLIGHT_LM3630A) += lm3630a_bl.o obj-$(CONFIG_BACKLIGHT_LM3639) += lm3639_bl.o diff --git a/drivers/video/backlight/ktz8866.c b/drivers/video/backlight/ktz8866.c new file mode 100644 index 000000000000..97b723719e13 --- /dev/null +++ b/drivers/video/backlight/ktz8866.c @@ -0,0 +1,209 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Backlight driver for the Kinetic KTZ8866 + * + * Copyright (C) 2022, 2023 Jianhua Lu + */ + +#include +#include +#include +#include +#include +#include +#include + +#define DEFAULT_BRIGHTNESS 1500 +#define MAX_BRIGHTNESS 2047 +#define REG_MAX 0x15 + +/* reg */ +#define DEVICE_ID 0x01 +#define BL_CFG1 0x02 +#define BL_CFG2 0x03 +#define BL_BRT_LSB 0x04 +#define BL_BRT_MSB 0x05 +#define BL_EN 0x08 +#define LCD_BIAS_CFG1 0x09 +#define LCD_BIAS_CFG2 0x0A +#define LCD_BIAS_CFG3 0x0B +#define LCD_BOOST_CFG 0x0C +#define OUTP_CFG 0x0D +#define OUTN_CFG 0x0E +#define FLAG 0x0F +#define BL_OPTION1 0x10 +#define BL_OPTION2 0x11 +#define PWM2DIG_LSBs 0x12 +#define PWM2DIG_MSBs 0x13 +#define BL_DIMMING 0x14 +#define PWM_RAMP_TIME 0x15 + +/* definition */ +#define BL_EN_BIT BIT(6) +#define LCD_BIAS_EN 0x9F +#define PWM_HYST 0x5 + +struct ktz8866 { + struct i2c_client *client; + struct regmap *regmap; + bool led_on; + struct gpio_desc *enable_gpio; +}; + +static const struct regmap_config ktz8866_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = REG_MAX, +}; + +static int ktz8866_write(struct ktz8866 *ktz, unsigned int reg, + unsigned int val) +{ + return regmap_write(ktz->regmap, reg, val); +} + +static int ktz8866_update_bits(struct ktz8866 *ktz, unsigned int reg, + unsigned int mask, unsigned int val) +{ + return regmap_update_bits(ktz->regmap, reg, mask, val); +} + +static int ktz8866_backlight_update_status(struct backlight_device *backlight_dev) +{ + struct ktz8866 *ktz = bl_get_data(backlight_dev); + unsigned int brightness = backlight_get_brightness(backlight_dev); + + if (!ktz->led_on && brightness > 0) { + ktz8866_update_bits(ktz, BL_EN, BL_EN_BIT, BL_EN_BIT); + ktz->led_on = true; + } else if (brightness == 0) { + ktz8866_update_bits(ktz, BL_EN, BL_EN_BIT, 0); + ktz->led_on = false; + } + + /* Set brightness */ + ktz8866_write(ktz, BL_BRT_LSB, brightness & 0x7); + ktz8866_write(ktz, BL_BRT_MSB, (brightness >> 3) & 0xFF); + + return 0; +} + +static const struct backlight_ops ktz8866_backlight_ops = { + .options = BL_CORE_SUSPENDRESUME, + .update_status = ktz8866_backlight_update_status, +}; + +static void ktz8866_init(struct ktz8866 *ktz) +{ + unsigned int val = 0; + + if (of_property_read_u32(ktz->client->dev.of_node, "current-num-sinks", &val)) + ktz8866_write(ktz, BL_EN, BIT(val) - 1); + else + /* Enable all 6 current sinks if the number of current sinks isn't specified. */ + ktz8866_write(ktz, BL_EN, BIT(6) - 1); + + if (of_property_read_u32(ktz->client->dev.of_node, "kinetic,current-ramp-delay-ms", &val)) { + if (val <= 128) + ktz8866_write(ktz, BL_CFG2, BIT(7) | (ilog2(val) << 3) | PWM_HYST); + else + ktz8866_write(ktz, BL_CFG2, BIT(7) | ((5 + val / 64) << 3) | PWM_HYST); + } + + if (of_property_read_u32(ktz->client->dev.of_node, "kinetic,led-enable-ramp-delay-ms", &val)) { + if (val == 0) + ktz8866_write(ktz, BL_DIMMING, 0); + else { + unsigned int ramp_off_time = ilog2(val) + 1; + unsigned int ramp_on_time = ramp_off_time << 4; + ktz8866_write(ktz, BL_DIMMING, ramp_on_time | ramp_off_time); + } + } + + if (of_property_read_bool(ktz->client->dev.of_node, "kinetic,enable-lcd-bias")) + ktz8866_write(ktz, LCD_BIAS_CFG1, LCD_BIAS_EN); +} + +static int ktz8866_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct backlight_device *backlight_dev; + struct backlight_properties props; + struct ktz8866 *ktz; + int ret = 0; + + ktz = devm_kzalloc(&client->dev, sizeof(*ktz), GFP_KERNEL); + if (!ktz) + return -ENOMEM; + + ktz->client = client; + ktz->regmap = devm_regmap_init_i2c(client, &ktz8866_regmap_config); + if (IS_ERR(ktz->regmap)) + return dev_err_probe(&client->dev, PTR_ERR(ktz->regmap), "failed to init regmap\n"); + + ret = devm_regulator_get_enable(&client->dev, "vddpos"); + if (ret) + return dev_err_probe(&client->dev, ret, "get regulator vddpos failed\n"); + ret = devm_regulator_get_enable(&client->dev, "vddneg"); + if (ret) + return dev_err_probe(&client->dev, ret, "get regulator vddneg failed\n"); + + ktz->enable_gpio = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_HIGH); + if (IS_ERR(ktz->enable_gpio)) + return PTR_ERR(ktz->enable_gpio); + + memset(&props, 0, sizeof(props)); + props.type = BACKLIGHT_RAW; + props.max_brightness = MAX_BRIGHTNESS; + props.brightness = DEFAULT_BRIGHTNESS; + props.scale = BACKLIGHT_SCALE_LINEAR; + + backlight_dev = devm_backlight_device_register(&client->dev, "ktz8866-backlight", + &client->dev, ktz, &ktz8866_backlight_ops, &props); + if (IS_ERR(backlight_dev)) + return dev_err_probe(&client->dev, PTR_ERR(backlight_dev), + "failed to register backlight device\n"); + + ktz8866_init(ktz); + + i2c_set_clientdata(client, backlight_dev); + backlight_update_status(backlight_dev); + + return 0; +} + +static void ktz8866_remove(struct i2c_client *client) +{ + struct backlight_device *backlight_dev = i2c_get_clientdata(client); + backlight_dev->props.brightness = 0; + backlight_update_status(backlight_dev); +} + +static const struct i2c_device_id ktz8866_ids[] = { + { "ktz8866", 0 }, + {}, +}; +MODULE_DEVICE_TABLE(i2c, ktz8866_ids); + +static const struct of_device_id ktz8866_match_table[] = { + { + .compatible = "kinetic,ktz8866", + }, + {}, +}; + +static struct i2c_driver ktz8866_driver = { + .driver = { + .name = "ktz8866", + .of_match_table = ktz8866_match_table, + }, + .probe = ktz8866_probe, + .remove = ktz8866_remove, + .id_table = ktz8866_ids, +}; + +module_i2c_driver(ktz8866_driver); + +MODULE_DESCRIPTION("Kinetic KTZ8866 Backlight Driver"); +MODULE_AUTHOR("Jianhua Lu "); +MODULE_LICENSE("GPL");