From patchwork Wed Dec 21 15:31:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jianhua Lu X-Patchwork-Id: 635824 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 31618C10F1B for ; Wed, 21 Dec 2022 15:36:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234841AbiLUPf5 (ORCPT ); Wed, 21 Dec 2022 10:35:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37704 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234890AbiLUPfd (ORCPT ); Wed, 21 Dec 2022 10:35:33 -0500 Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2CA422495C; Wed, 21 Dec 2022 07:32:05 -0800 (PST) Received: by mail-pj1-x1033.google.com with SMTP id v13-20020a17090a6b0d00b00219c3be9830so2409318pjj.4; Wed, 21 Dec 2022 07:32:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=SHpbm65i3qPb+0IeMkxdI9AlLCwaDtvZNcSfvLMEXgk=; b=p005q3woIlKjM0pEzsIQiQOurW3EcTP2jRctbiXKufGvXs2a14yDAOoxIM1Ttw6Oyx Dhs33LfiT03DTttbyHEgZLf9IGhqwhJI9cQiYo6Yf0vc4TF0TXTEn1VxxSjIiCoVqhXU m9VEsgzg9EaUUHqMM/lULQdszpbJTietgKBDdCQ88rZq9ZUhwIxvl2kSfIOO+flBs/r1 X/sxyI5KCyR5Pcs56BRMcDDjYKtxY16HPA/Wsrq2hvA2W40MYHaBYePDYleQ+4G1Tu3L Iddjr18VvK4xUyxDXkUPXVG/CW3hMA7DmIVTjNgiCKa1qj38+ObtX+7Yr8my4o50O1Z2 ssow== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=SHpbm65i3qPb+0IeMkxdI9AlLCwaDtvZNcSfvLMEXgk=; b=C2MURPKaXsLRDFMk80N5FcNLhBp6MYK/yX/J4xJnaExootqgIMb4b3rIbKzYih7idn LeWj2FFAdr5SkWFuqqLAE1isu2sk8ceNoHalBNj0WmGkUi2iqTMxEUHW39yKzFVmG7q6 k4kvM9KoTGt3mLRyYeGpXmjZGp+ndUOvWDStpmFizrz3mr6zGBTUZoHrcz6wrlm05Iby VHtDwFkGzuqZf5hqwJxv9LJpkMAJmzoypTmWcYwxlDgHTEK8zJqI+ZEyWskZ7Ls8Xc1L M26ISAlGE2x4BsKiLFba2CWnlSq0k0zHXhmc8BHnFTxyaj6ExnlyBZjRJIpkQBZvYYkl w5Hw== X-Gm-Message-State: AFqh2krNqP2No9z3RkHB33F4EksvzRkLeefa+P5J7Uji8mb889Xy0VQC G3IIH2HdjLmJ1f8P6iif8mZcGDpLfgG9vYhYBLI= X-Google-Smtp-Source: AMrXdXsKX0WpoIVcC/8hC/GZCzYXwDc3Zss14Murt/k5cCboa0E1NqOEql3n1NJoosWALV3fIn6LSA== X-Received: by 2002:a17:902:eb4c:b0:187:450:2692 with SMTP id i12-20020a170902eb4c00b0018704502692mr2145911pli.22.1671636724563; Wed, 21 Dec 2022 07:32:04 -0800 (PST) Received: from localhost.localdomain ([45.62.172.3]) by smtp.gmail.com with ESMTPSA id n3-20020a170902e54300b00186ff402508sm11633409plf.281.2022.12.21.07.31.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Dec 2022 07:32:04 -0800 (PST) From: Jianhua Lu To: Lee Jones , Daniel Thompson , Jingoo Han , Pavel Machek , Rob Herring , Krzysztof Kozlowski , Helge Deller Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-fbdev@vger.kernel.org, Jianhua Lu Subject: [PATCH v2 1/2] backlight: ktz8866: Add support for Kinetic KTZ8866 backlight Date: Wed, 21 Dec 2022 23:31:53 +0800 Message-Id: <20221221153154.25411-1-lujianhua000@gmail.com> X-Mailer: git-send-email 2.38.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org 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 Reviewed-by: Krzysztof Kozlowski --- Changces in v2: - Add missing staitc modifier to ktz8866_write function. drivers/video/backlight/Kconfig | 8 ++ drivers/video/backlight/Makefile | 1 + drivers/video/backlight/ktz8866.c | 174 ++++++++++++++++++++++++++++++ drivers/video/backlight/ktz8866.h | 31 ++++++ 4 files changed, 214 insertions(+) create mode 100644 drivers/video/backlight/ktz8866.c create mode 100644 drivers/video/backlight/ktz8866.h diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 936ba1e4d35e..2845fd7e33ad 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 enabled 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..a0ea6ebbda60 --- /dev/null +++ b/drivers/video/backlight/ktz8866.c @@ -0,0 +1,174 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Backlight driver for the Kinetic KTZ8866 + * + * Copyright (C) Jianhua Lu + */ + +#include +#include +#include +#include +#include +#include +#include +#include "ktz8866.h" + +#define DEF_BRIGHTNESS 1500 +#define MAX_BRIGHTNESS 2047 +#define REG_MAX 0x15 + +/* Helper */ +#define low_3_bit(x) ((x)&0x7) +#define high_8_bit(x) ((x >> 3) & 0xFF) + +struct ktz8866 { + struct i2c_client *client; + struct regmap *regmap; + bool state; +}; + +enum { + LED_OFF, + LED_ON, +}; + +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->state && brightness > 0) { + ktz8866_update_bits(ktz, BL_EN, BIT(6), BIT(6)); + ktz->state = LED_ON; + } else if (brightness == 0) { + ktz8866_update_bits(ktz, BL_EN, BIT(6), 0); + ktz->state = LED_OFF; + msleep(10); + } + + /* Set brightness */ + ktz8866_write(ktz, BL_BRT_LSB, low_3_bit(brightness)); + ktz8866_write(ktz, BL_BRT_MSB, high_8_bit(brightness)); + + 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) +{ + /* Enable 1~5 current sinks */ + ktz8866_write(ktz, BL_EN, 0x1F); + /* Backlight OVP 26.4V */ + ktz8866_write(ktz, BL_CFG1, 0x33); + /* LED ramping time 128ms */ + ktz8866_write(ktz, BL_CFG2, 0xBD); + /* LED on/off ramping time 1ms */ + ktz8866_write(ktz, BL_DIMMING, 0x11); + /* Enable OUTP and OUTN via pin ENP and ENN */ + ktz8866_write(ktz, LCD_BIAS_CFG1, 0x9F); + /* Backlight Full-scale LED Current 30.0mA */ + ktz8866_write(ktz, FULL_SCALE_CURRENT, 0xF9); +} + +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; + + 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)) { + dev_err(&client->dev, "failed to init regmap\n"); + return PTR_ERR(ktz->regmap); + } + + memset(&props, 0, sizeof(props)); + props.type = BACKLIGHT_RAW; + props.max_brightness = MAX_BRIGHTNESS; + props.brightness = + clamp_t(unsigned int, DEF_BRIGHTNESS, 0, props.max_brightness); + + backlight_dev = devm_backlight_device_register( + &client->dev, "ktz8866-backlight", &client->dev, ktz, + &ktz8866_backlight_ops, &props); + + if (IS_ERR(backlight_dev)) { + dev_err(&client->dev, "failed to register backlight device\n"); + return PTR_ERR(backlight_dev); + } + + 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"); diff --git a/drivers/video/backlight/ktz8866.h b/drivers/video/backlight/ktz8866.h new file mode 100644 index 000000000000..b2a606288a7e --- /dev/null +++ b/drivers/video/backlight/ktz8866.h @@ -0,0 +1,31 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Register definitions for Kinetic KTZ8866 backlight + * + * Copyright (C) Jianhua Lu + */ + +#ifndef KTZ8866_H +#define KTZ8866_H + +#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 FULL_SCALE_CURRENT 0x15 + +#endif /* KTZ8866_H */