From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f172.google.com (mail-pl1-f172.google.com [209.85.214.172]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9A0E819E7D1 for ; Sun, 23 Nov 2025 19:11:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763925071; cv=none; b=BnwQom1hp/1ZqxQyvzUvMi0F0ZX1jCQujuRtu1eauzC28gRdgzJn3n2lsxoPEvmZdowMgg05Bdq0YOGzsV2zAImHoGvdUY5z+9ovGDUNMmatHXCekTl7GhNypOo6KFqFcuvMXxF4PhjV8r4FFGTECW3D7uQBhTaf3hJT4EbrUCM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763925071; c=relaxed/simple; bh=O18plpShV+fchMUltKYvzGY56U0ZJBnotTRON8MyPm0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=krcGbXkr4GLR90R6F/9yN7WYeFzXSYYwT0rwnkcNmFAqZTAqh2doj8KfQLSjG07A9linjvstZVC1r5oDcjsVQQYVBzLhHctBQuTkly8Sug6LT1/SAFMlnfsa5+Ojc7Hbg/ShoEdNZlEq/3n77OqEe3cpIeINawtoZy0zJtT9Yq8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=YcS4NAY7; arc=none smtp.client-ip=209.85.214.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="YcS4NAY7" Received: by mail-pl1-f172.google.com with SMTP id d9443c01a7336-2953e415b27so44045375ad.2 for ; Sun, 23 Nov 2025 11:11:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1763925067; x=1764529867; darn=vger.kernel.org; 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=cyY8yfoYlTTD3ZiROTexVERYQH2FovLAoeHxnuHoIL4=; b=YcS4NAY7kWUneQlvkTqVw9RmRdiBmVWiwfffEE0gQbg+4Vx4WSskEaXyknMnJDvmyy uWcEO2V78/QUeeepMoGBVoZX5SdnBhu/o3rllhjzi7KML5KXsSwtBzJQ9841KFwQuy+6 0oVUcsS0tGX0CXLE4DntzK/U8dNycLQ4M8jtUIFG9TEmNwfVLk8dTWHSU8ryguPAZ3Fu PS+uuOdaAYoSGjd8HAWKxzsoeOatGBpAM8cIJtu9875iIVZLDwMWMGTlGz69t4xAXuKc ocl+U3AmLokJZLHR9twRjQSYhBdI5Y2nsWAELtaf0WJiRF/AW2Hfg668VRdQ+yOWv5Op tNVA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763925067; x=1764529867; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=cyY8yfoYlTTD3ZiROTexVERYQH2FovLAoeHxnuHoIL4=; b=fYXJD/x6OwZF5Yo+8vOfNiIa/0OLHPoXuKnLM2d5W9H80vlbtcSHKludORs60nzo0S 4lvPOQsuntC7RmU/BNAtxGzKLSTS6uSIuqeGjms++mmMNkHTO68joz7kgSPdHfgYmMjP 7sR0yleovDMLuUQMvqaxTudzl5qjmqirYlMghMahlL7lGHC62mS4syaSRzBSFQPT62id JFsCFiDyB1z+G4DZoTl7+ioTjUJzgqVL4+rqQW7DtphLFSD0rL5Zso0C4vsRTvWaeHqY KIJ66IZrko07ekZ+8U6MMnhiSf6Wg3JVTymq60WHo8HSL4r0xJ7xeVXG288HpmbVh11B vRxA== X-Forwarded-Encrypted: i=1; AJvYcCU7kRtTZR/UGdyPLUMqU4r96Usss3iq+thC1eG6ylm9UeDuULe175iuRNQbZGwU1vhgt4Cx7DWOpOQ=@vger.kernel.org X-Gm-Message-State: AOJu0YysO69DqXrFtHU6UbaJ/J1rG54cUryYa4uK4kCJwCNLhMdSnKOc MD3AmgVzpeDE+v4/x67TNDa9qJ/SM0appdkdXuaENY16ZYw2p/hCvLCZ X-Gm-Gg: ASbGncuXAb/DaoBcJlq5MppWpLS/D6iKaFVrnU1NWDsCk4WTDu4v5GtDJ2NAZWcif2R irNJT04qg4SLVUEgRI3zSmC3LW0S3mvUMKavC8yg87A7xiwaTbpFhqOOtYhyA1OAOXTG02iCbcd Xg50+KLvsF7YRDLUhbR0CYdqqrN+IE/cMqU3ik7vxgbAtlHUcjEWhB11fu1unz2F2PLYNgzeDK1 wlEkgfi2Gkpnr7KJFIaRS6VTJAMGYFfT3T6cCI89mcKQQkzd7umUXAQN+4YqLdDy1H2PB1YRcsH I3UlP2W/8R3ezVM+yvIIfE3LBjqruPcRR5gO/pP22UmOpW8BlWYsT84ZVzZ7oh/BmyoMu9Ep7Id G7UCbUUgFu+fvjKeA0C5H8BW6SN/rC1UWulpVLigZUMICbixtKUCXsbes9hnhJiinIQgSnS9J2F ZT0DbCmH3h0hK1qmU08iraBA== X-Google-Smtp-Source: AGHT+IEdn990VS6mIQgE7tE5DSzyxK+qGQZSd+broKw5osyU92CnIjEPsGRx3SdB01/BLY7WtxSiZg== X-Received: by 2002:a17:903:2985:b0:298:1830:6ada with SMTP id d9443c01a7336-29b6bf19c83mr111145565ad.30.1763925066725; Sun, 23 Nov 2025 11:11:06 -0800 (PST) Received: from DESKTOP-P76LG1N.lan ([42.116.199.188]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29b5b13e720sm109542655ad.42.2025.11.23.11.11.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 23 Nov 2025 11:11:05 -0800 (PST) From: Nam Tran To: lee@kernel.org Cc: pavel@kernel.org, gregkh@linuxfoundation.org, rdunlap@infradead.org, christophe.jaillet@wanadoo.fr, krzk+dt@kernel.org, robh@kernel.org, conor+dt@kernel.org, corbet@lwn.net, linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-doc@vger.kernel.org, Nam Tran Subject: [PATCH v18 2/3] leds: add basic support for TI/National Semiconductor LP5812 LED Driver Date: Mon, 24 Nov 2025 02:10:41 +0700 Message-Id: <20251123191042.116917-3-trannamatk@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20251123191042.116917-1-trannamatk@gmail.com> References: <20251123191042.116917-1-trannamatk@gmail.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The LP5812 is a 4x3 matrix RGB LED driver with an autonomous animation engine and time-cross-multiplexing (TCM) support for up to 12 LEDs or 4 RGB LEDs. Each LED can be configured through the related registers to realize vivid and fancy lighting effects. This patch adds minimal driver support for the LP5812, implementing only the essential functionality: I2C communication with the device, LED registration, brightness control in manual mode, and basic sysfs interfaces for LED configuration and fault monitoring. This patch adds minimal driver support for the LP5812, implementing only the essential functionality: I2C communication with the device, LED registration, brightness control in manual mode, and basic sysfs interfaces for LED configuration and fault monitoring. Signed-off-by: Nam Tran --- MAINTAINERS | 4 + drivers/leds/rgb/Kconfig | 13 + drivers/leds/rgb/Makefile | 1 + drivers/leds/rgb/leds-lp5812.c | 646 +++++++++++++++++++++++++++++++++ drivers/leds/rgb/leds-lp5812.h | 172 +++++++++ 5 files changed, 836 insertions(+) create mode 100644 drivers/leds/rgb/leds-lp5812.c create mode 100644 drivers/leds/rgb/leds-lp5812.h diff --git a/MAINTAINERS b/MAINTAINERS index 22da152c3c87..9a7ae1794328 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -25453,6 +25453,10 @@ M: Nam Tran L: linux-leds@vger.kernel.org S: Maintained F: Documentation/devicetree/bindings/leds/ti,lp5812.yaml +F: drivers/leds/rgb/Kconfig +F: drivers/leds/rgb/Makefile +F: drivers/leds/rgb/leds-lp5812.c +F: drivers/leds/rgb/leds-lp5812.h TEXAS INSTRUMENTS' LB8864 LED BACKLIGHT DRIVER M: Alexander Sverdlin diff --git a/drivers/leds/rgb/Kconfig b/drivers/leds/rgb/Kconfig index 222d943d826a..28ef4c487367 100644 --- a/drivers/leds/rgb/Kconfig +++ b/drivers/leds/rgb/Kconfig @@ -26,6 +26,19 @@ config LEDS_KTD202X To compile this driver as a module, choose M here: the module will be called leds-ktd202x. +config LEDS_LP5812 + tristate "LED support for Texas Instruments LP5812" + depends on I2C + help + If you say Y here you get support for TI LP5812 LED driver. + The LP5812 is a 4x3 matrix RGB LED driver with autonomous + animation engine control. + + To compile this driver as a module, choose M here: the + module will be called leds-lp5812. + + If unsure, say N. + config LEDS_NCP5623 tristate "LED support for NCP5623" depends on I2C diff --git a/drivers/leds/rgb/Makefile b/drivers/leds/rgb/Makefile index a501fd27f179..be45991f63f5 100644 --- a/drivers/leds/rgb/Makefile +++ b/drivers/leds/rgb/Makefile @@ -2,6 +2,7 @@ obj-$(CONFIG_LEDS_GROUP_MULTICOLOR) += leds-group-multicolor.o obj-$(CONFIG_LEDS_KTD202X) += leds-ktd202x.o +obj-$(CONFIG_LEDS_LP5812) += leds-lp5812.o obj-$(CONFIG_LEDS_NCP5623) += leds-ncp5623.o obj-$(CONFIG_LEDS_PWM_MULTICOLOR) += leds-pwm-multicolor.o obj-$(CONFIG_LEDS_QCOM_LPG) += leds-qcom-lpg.o diff --git a/drivers/leds/rgb/leds-lp5812.c b/drivers/leds/rgb/leds-lp5812.c new file mode 100644 index 000000000000..21515d97913e --- /dev/null +++ b/drivers/leds/rgb/leds-lp5812.c @@ -0,0 +1,646 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * LP5812 LED driver + * + * Copyright (C) 2025 Texas Instruments + * + * Author: Jared Zhou + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "leds-lp5812.h" + +static const struct lp5812_mode_mapping chip_mode_map[] = { + {"direct_mode", 0, 0, 0, 0, 0, 0}, + {"tcm:1:0", 1, 0, 0, 0, 0, 0}, + {"tcm:1:1", 1, 1, 0, 0, 0, 0}, + {"tcm:1:2", 1, 2, 0, 0, 0, 0}, + {"tcm:1:3", 1, 3, 0, 0, 0, 0}, + {"tcm:2:0:1", 2, 0, 1, 0, 0, 0}, + {"tcm:2:0:2", 2, 0, 2, 0, 0, 0}, + {"tcm:2:0:3", 2, 0, 3, 0, 0, 0}, + {"tcm:2:1:2", 2, 1, 2, 0, 0, 0}, + {"tcm:2:1:3", 2, 1, 3, 0, 0, 0}, + {"tcm:2:2:3", 2, 2, 3, 0, 0, 0}, + {"tcm:3:0:1:2", 3, 0, 1, 2, 0, 0}, + {"tcm:3:0:1:3", 3, 0, 1, 3, 0, 0}, + {"tcm:3:0:2:3", 3, 0, 2, 3, 0, 0}, + {"tcm:4:0:1:2:3", 4, 0, 1, 2, 3, 0}, + {"mix:1:0:1", 5, 1, 0, 0, 0, 0}, + {"mix:1:0:2", 5, 2, 0, 0, 0, 0}, + {"mix:1:0:3", 5, 3, 0, 0, 0, 0}, + {"mix:1:1:0", 5, 0, 0, 0, 0, 1}, + {"mix:1:1:2", 5, 2, 0, 0, 0, 1}, + {"mix:1:1:3", 5, 3, 0, 0, 0, 1}, + {"mix:1:2:0", 5, 0, 0, 0, 0, 2}, + {"mix:1:2:1", 5, 1, 0, 0, 0, 2}, + {"mix:1:2:3", 5, 3, 0, 0, 0, 2}, + {"mix:1:3:0", 5, 0, 0, 0, 0, 3}, + {"mix:1:3:1", 5, 1, 0, 0, 0, 3}, + {"mix:1:3:2", 5, 2, 0, 0, 0, 3}, + {"mix:2:0:1:2", 6, 1, 2, 0, 0, 0}, + {"mix:2:0:1:3", 6, 1, 3, 0, 0, 0}, + {"mix:2:0:2:3", 6, 2, 3, 0, 0, 0}, + {"mix:2:1:0:2", 6, 0, 2, 0, 0, 1}, + {"mix:2:1:0:3", 6, 0, 3, 0, 0, 1}, + {"mix:2:1:2:3", 6, 2, 3, 0, 0, 1}, + {"mix:2:2:0:1", 6, 0, 1, 0, 0, 2}, + {"mix:2:2:0:3", 6, 0, 3, 0, 0, 2}, + {"mix:2:2:1:3", 6, 1, 3, 0, 0, 2}, + {"mix:2:3:0:1", 6, 0, 1, 0, 0, 3}, + {"mix:2:3:0:2", 6, 0, 2, 0, 0, 3}, + {"mix:2:3:1:2", 6, 1, 2, 0, 0, 3}, + {"mix:3:0:1:2:3", 7, 1, 2, 3, 0, 0}, + {"mix:3:1:0:2:3", 7, 0, 2, 3, 0, 1}, + {"mix:3:2:0:1:3", 7, 0, 1, 3, 0, 2}, + {"mix:3:3:0:1:2", 7, 0, 1, 2, 0, 3} +}; + +static int lp5812_write(struct lp5812_chip *chip, u16 reg, u8 val) +{ + struct device *dev = &chip->client->dev; + struct i2c_msg msg; + u8 buf[LP5812_DATA_LENGTH]; + u8 reg_addr_bit8_9; + int ret; + + /* Extract register address bits 9 and 8 for Address Byte 1 */ + reg_addr_bit8_9 = (reg >> LP5812_REG_ADDR_HIGH_SHIFT) & LP5812_REG_ADDR_BIT_8_9_MASK; + + /* Prepare payload: Address Byte 2 (bits [7:0]) and value to write */ + buf[LP5812_DATA_BYTE_0_IDX] = (u8)(reg & LP5812_REG_ADDR_LOW_MASK); + buf[LP5812_DATA_BYTE_1_IDX] = val; + + /* Construct I2C message for a write operation */ + msg.addr = (chip->client->addr << LP5812_CHIP_ADDR_SHIFT) | reg_addr_bit8_9; + msg.flags = 0; + msg.len = sizeof(buf); + msg.buf = buf; + + ret = i2c_transfer(chip->client->adapter, &msg, 1); + if (ret == 1) + return 0; + + dev_err(dev, "I2C write error, ret=%d\n", ret); + return ret < 0 ? ret : -EIO; +} + +static int lp5812_read(struct lp5812_chip *chip, u16 reg, u8 *val) +{ + struct device *dev = &chip->client->dev; + struct i2c_msg msgs[LP5812_READ_MSG_LENGTH]; + u8 ret_val; + u8 reg_addr_bit8_9; + u8 converted_reg; + int ret; + + /* Extract register address bits 9 and 8 for Address Byte 1 */ + reg_addr_bit8_9 = (reg >> LP5812_REG_ADDR_HIGH_SHIFT) & LP5812_REG_ADDR_BIT_8_9_MASK; + + /* Lower 8 bits go in Address Byte 2 */ + converted_reg = (u8)(reg & LP5812_REG_ADDR_LOW_MASK); + + /* Prepare I2C write message to set register address */ + msgs[LP5812_MSG_0_IDX].addr = + (chip->client->addr << LP5812_CHIP_ADDR_SHIFT) | reg_addr_bit8_9; + msgs[LP5812_MSG_0_IDX].flags = 0; + msgs[LP5812_MSG_0_IDX].len = 1; + msgs[LP5812_MSG_0_IDX].buf = &converted_reg; + + /* Prepare I2C read message to retrieve register value */ + msgs[LP5812_MSG_1_IDX].addr = + (chip->client->addr << LP5812_CHIP_ADDR_SHIFT) | reg_addr_bit8_9; + msgs[LP5812_MSG_1_IDX].flags = I2C_M_RD; + msgs[LP5812_MSG_1_IDX].len = 1; + msgs[LP5812_MSG_1_IDX].buf = &ret_val; + + ret = i2c_transfer(chip->client->adapter, msgs, LP5812_READ_MSG_LENGTH); + if (ret == LP5812_READ_MSG_LENGTH) { + *val = ret_val; + return 0; + } + + dev_err(dev, "I2C read error, ret=%d\n", ret); + *val = 0; + return ret < 0 ? ret : -EIO; +} + +static int lp5812_read_tsd_config_status(struct lp5812_chip *chip, u8 *reg_val) +{ + return lp5812_read(chip, LP5812_TSD_CONFIG_STATUS, reg_val); +} + +static int lp5812_update_regs_config(struct lp5812_chip *chip) +{ + u8 reg_val; + int ret; + + ret = lp5812_write(chip, LP5812_CMD_UPDATE, LP5812_UPDATE_CMD_VAL); + if (ret) + return ret; + + ret = lp5812_read_tsd_config_status(chip, ®_val); + if (ret) + return ret; + + return reg_val & LP5812_CFG_ERR_STATUS_MASK; +} + +static ssize_t parse_drive_mode(struct lp5812_chip *chip, const char *str) +{ + int i; + + chip->u_drive_mode.s_drive_mode.mix_sel_led_0 = false; + chip->u_drive_mode.s_drive_mode.mix_sel_led_1 = false; + chip->u_drive_mode.s_drive_mode.mix_sel_led_2 = false; + chip->u_drive_mode.s_drive_mode.mix_sel_led_3 = false; + + if (sysfs_streq(str, LP5812_MODE_DIRECT_NAME)) { + chip->u_drive_mode.s_drive_mode.led_mode = LP5812_MODE_DIRECT_VALUE; + return 0; + } + + for (i = 0; i < ARRAY_SIZE(chip_mode_map); i++) { + if (!sysfs_streq(str, chip_mode_map[i].mode_name)) + continue; + + chip->u_drive_mode.s_drive_mode.led_mode = chip_mode_map[i].mode; + chip->u_scan_order.s_scan_order.scan_order_0 = chip_mode_map[i].scan_order_0; + chip->u_scan_order.s_scan_order.scan_order_1 = chip_mode_map[i].scan_order_1; + chip->u_scan_order.s_scan_order.scan_order_2 = chip_mode_map[i].scan_order_2; + chip->u_scan_order.s_scan_order.scan_order_3 = chip_mode_map[i].scan_order_3; + + switch (chip_mode_map[i].selection_led) { + case LP5812_MODE_MIX_SELECT_LED_0: + chip->u_drive_mode.s_drive_mode.mix_sel_led_0 = true; + break; + case LP5812_MODE_MIX_SELECT_LED_1: + chip->u_drive_mode.s_drive_mode.mix_sel_led_1 = true; + break; + case LP5812_MODE_MIX_SELECT_LED_2: + chip->u_drive_mode.s_drive_mode.mix_sel_led_2 = true; + break; + case LP5812_MODE_MIX_SELECT_LED_3: + chip->u_drive_mode.s_drive_mode.mix_sel_led_3 = true; + break; + default: + return -EINVAL; + } + + return 0; + } + + return -EINVAL; +} + +static int lp5812_set_drive_mode_scan_order(struct lp5812_chip *chip) +{ + u8 val; + int ret; + + val = chip->u_drive_mode.drive_mode_val; + ret = lp5812_write(chip, LP5812_DEV_CONFIG1, val); + if (ret) + return ret; + + val = chip->u_scan_order.scan_order_val; + ret = lp5812_write(chip, LP5812_DEV_CONFIG2, val); + + return ret; +} + +static int lp5812_set_led_mode(struct lp5812_chip *chip, int led_number, + enum control_mode mode) +{ + u8 reg_val; + u16 reg; + int ret; + + /* + * Select device configuration register. + * Reg3 for LED_0–LED_3, LED_A0–A2, LED_B0 + * Reg4 for LED_B1–B2, LED_C0–C2, LED_D0–D2 + */ + if (led_number < LP5812_NUMBER_LED_IN_REG) + reg = LP5812_DEV_CONFIG3; + else + reg = LP5812_DEV_CONFIG4; + + ret = lp5812_read(chip, reg, ®_val); + if (ret) + return ret; + + if (mode == LP5812_MODE_MANUAL) + reg_val &= ~(LP5812_ENABLE << (led_number % LP5812_NUMBER_LED_IN_REG)); + else + reg_val |= (LP5812_ENABLE << (led_number % LP5812_NUMBER_LED_IN_REG)); + + ret = lp5812_write(chip, reg, reg_val); + if (ret) + return ret; + + ret = lp5812_update_regs_config(chip); + + return ret; +} + +static int lp5812_manual_dc_pwm_control(struct lp5812_chip *chip, int led_number, + u8 val, enum dimming_type dimming_type) +{ + u16 led_base_reg; + int ret; + + if (dimming_type == LP5812_DIMMING_ANALOG) + led_base_reg = LP5812_MANUAL_DC_BASE; + else + led_base_reg = LP5812_MANUAL_PWM_BASE; + + ret = lp5812_write(chip, led_base_reg + led_number, val); + + return ret; +} + +static int lp5812_multicolor_brightness(struct lp5812_led *led) +{ + struct lp5812_chip *chip = led->chip; + int ret, i; + + guard(mutex)(&chip->lock); + for (i = 0; i < led->mc_cdev.num_colors; i++) { + ret = lp5812_manual_dc_pwm_control(chip, led->mc_cdev.subled_info[i].channel, + led->mc_cdev.subled_info[i].brightness, + LP5812_DIMMING_PWM); + if (ret) + return ret; + } + + return 0; +} + +static int lp5812_led_brightness(struct lp5812_led *led) +{ + struct lp5812_chip *chip = led->chip; + struct lp5812_led_config *led_cfg; + int ret; + + led_cfg = &chip->led_config[led->chan_nr]; + + guard(mutex)(&chip->lock); + ret = lp5812_manual_dc_pwm_control(chip, led_cfg->led_id[0], + led->brightness, LP5812_DIMMING_PWM); + + return ret; +} + +static int lp5812_set_brightness(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct lp5812_led *led = container_of(cdev, struct lp5812_led, cdev); + + led->brightness = (u8)brightness; + + return lp5812_led_brightness(led); +} + +static int lp5812_set_mc_brightness(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct led_classdev_mc *mc_dev = lcdev_to_mccdev(cdev); + struct lp5812_led *led = container_of(mc_dev, struct lp5812_led, mc_cdev); + + led_mc_calc_color_components(&led->mc_cdev, brightness); + + return lp5812_multicolor_brightness(led); +} + +static int lp5812_init_led(struct lp5812_led *led, struct lp5812_chip *chip, int chan) +{ + struct device *dev = &chip->client->dev; + struct mc_subled *mc_led_info; + struct led_classdev *led_cdev; + int i, ret; + + if (chip->led_config[chan].name) { + led->cdev.name = chip->led_config[chan].name; + } else { + led->cdev.name = devm_kasprintf(dev, GFP_KERNEL, "%s:channel%d", + chip->label ? : chip->client->name, chan); + if (!led->cdev.name) + return -ENOMEM; + } + + if (!chip->led_config[chan].is_sc_led) { + mc_led_info = devm_kcalloc(dev, chip->led_config[chan].num_colors, + sizeof(*mc_led_info), GFP_KERNEL); + if (!mc_led_info) + return -ENOMEM; + + led_cdev = &led->mc_cdev.led_cdev; + led_cdev->name = led->cdev.name; + led_cdev->brightness_set_blocking = lp5812_set_mc_brightness; + led->mc_cdev.num_colors = chip->led_config[chan].num_colors; + + for (i = 0; i < led->mc_cdev.num_colors; i++) { + mc_led_info[i].color_index = + chip->led_config[chan].color_id[i]; + mc_led_info[i].channel = + chip->led_config[chan].led_id[i]; + } + + led->mc_cdev.subled_info = mc_led_info; + } else { + led->cdev.brightness_set_blocking = lp5812_set_brightness; + } + + led->chan_nr = chan; + + if (chip->led_config[chan].is_sc_led) { + ret = devm_led_classdev_register(dev, &led->cdev); + if (ret == 0) + led->cdev.dev->platform_data = led; + } else { + ret = devm_led_classdev_multicolor_register(dev, &led->mc_cdev); + if (ret == 0) + led->mc_cdev.led_cdev.dev->platform_data = led; + } + + return ret; +} + +static int lp5812_register_leds(struct lp5812_led *leds, struct lp5812_chip *chip) +{ + struct lp5812_led *led; + int num_channels = chip->num_channels; + u8 reg_val; + u16 reg; + int ret, i, j; + + for (i = 0; i < num_channels; i++) { + led = &leds[i]; + ret = lp5812_init_led(led, chip, i); + if (ret) + goto err_init_led; + + led->chip = chip; + + for (j = 0; j < chip->led_config[i].num_colors; j++) { + ret = lp5812_write(chip, + LP5812_AUTO_DC_BASE + chip->led_config[i].led_id[j], + chip->led_config[i].max_current[j]); + if (ret) + goto err_init_led; + + ret = lp5812_manual_dc_pwm_control(chip, chip->led_config[i].led_id[j], + chip->led_config[i].max_current[j], + LP5812_DIMMING_ANALOG); + if (ret) + goto err_init_led; + + ret = lp5812_set_led_mode(chip, chip->led_config[i].led_id[j], + LP5812_MODE_MANUAL); + if (ret) + goto err_init_led; + + reg = (chip->led_config[i].led_id[j] < LP5812_NUMBER_LED_IN_REG) ? + LP5812_LED_EN_1 : LP5812_LED_EN_2; + + ret = lp5812_read(chip, reg, ®_val); + if (ret) + goto err_init_led; + + reg_val |= (LP5812_ENABLE << (chip->led_config[i].led_id[j] % + LP5812_NUMBER_LED_IN_REG)); + + ret = lp5812_write(chip, reg, reg_val); + if (ret) + goto err_init_led; + } + } + + return 0; + +err_init_led: + return ret; +} + +static int lp5812_init_device(struct lp5812_chip *chip) +{ + int ret; + + usleep_range(LP5812_WAIT_DEVICE_STABLE_MIN, LP5812_WAIT_DEVICE_STABLE_MAX); + + ret = lp5812_write(chip, LP5812_REG_ENABLE, LP5812_ENABLE); + if (ret) { + dev_err(&chip->client->dev, "failed to enable LP5812 device\n"); + return ret; + } + + ret = lp5812_write(chip, LP5812_DEV_CONFIG12, LP5812_LSD_LOD_START_UP); + if (ret) { + dev_err(&chip->client->dev, "failed to configure device safety thresholds\n"); + return ret; + } + + ret = parse_drive_mode(chip, chip->scan_mode); + if (ret) + return ret; + + ret = lp5812_set_drive_mode_scan_order(chip); + if (ret) + return ret; + + ret = lp5812_update_regs_config(chip); + if (ret) { + dev_err(&chip->client->dev, "failed to apply configuration updates\n"); + return ret; + } + + return 0; +} + +static void lp5812_deinit_device(struct lp5812_chip *chip) +{ + lp5812_write(chip, LP5812_LED_EN_1, LP5812_DISABLE); + lp5812_write(chip, LP5812_LED_EN_2, LP5812_DISABLE); + lp5812_write(chip, LP5812_REG_ENABLE, LP5812_DISABLE); +} + +static int lp5812_parse_led_channel(struct device_node *np, + struct lp5812_led_config *cfg, + int color_number) +{ + int color_id, reg, ret; + u32 max_cur; + + ret = of_property_read_u32(np, "reg", ®); + if (ret) + return ret; + + cfg->led_id[color_number] = reg; + + ret = of_property_read_u32(np, "led-max-microamp", &max_cur); + if (ret) + max_cur = 0; + /* Convert microamps to driver units */ + cfg->max_current[color_number] = max_cur / 100; + + ret = of_property_read_u32(np, "color", &color_id); + if (ret) + color_id = 0; + cfg->color_id[color_number] = color_id; + + return 0; +} + +static int lp5812_parse_led(struct device_node *np, + struct lp5812_led_config *cfg, + int led_index) +{ + int num_colors, ret; + + ret = of_property_read_string(np, "label", &cfg[led_index].name); + if (ret) + return ret; + + ret = of_property_read_u32(np, "reg", &cfg[led_index].chan_nr); + if (ret) + return ret; + + num_colors = 0; + for_each_available_child_of_node_scoped(np, child) { + ret = lp5812_parse_led_channel(child, &cfg[led_index], num_colors); + if (ret) + return ret; + + num_colors++; + } + + if (num_colors == 0) { + ret = lp5812_parse_led_channel(np, &cfg[led_index], 0); + if (ret) + return ret; + + num_colors = 1; + cfg[led_index].is_sc_led = true; + } else { + cfg[led_index].is_sc_led = false; + } + + cfg[led_index].num_colors = num_colors; + + return 0; +} + +static int lp5812_of_probe(struct device *dev, + struct device_node *np, + struct lp5812_chip *chip) +{ + struct lp5812_led_config *cfg; + int num_channels, i = 0, ret; + + num_channels = of_get_available_child_count(np); + if (num_channels == 0) { + dev_err(dev, "no LED channels\n"); + return -EINVAL; + } + + cfg = devm_kcalloc(dev, num_channels, sizeof(*cfg), GFP_KERNEL); + if (!cfg) + return -ENOMEM; + + chip->led_config = &cfg[0]; + chip->num_channels = num_channels; + + for_each_available_child_of_node_scoped(np, child) { + ret = lp5812_parse_led(child, cfg, i); + if (ret) + return -EINVAL; + i++; + } + + ret = of_property_read_string(np, "ti,scan-mode", &chip->scan_mode); + if (ret) + chip->scan_mode = LP5812_MODE_DIRECT_NAME; + + of_property_read_string(np, "label", &chip->label); + + return 0; +} + +static int lp5812_probe(struct i2c_client *client) +{ + struct lp5812_chip *chip; + struct device_node *np = dev_of_node(&client->dev); + struct lp5812_led *leds; + int ret; + + if (!np) + return -EINVAL; + + chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + ret = lp5812_of_probe(&client->dev, np, chip); + if (ret) + return ret; + + leds = devm_kcalloc(&client->dev, chip->num_channels, sizeof(*leds), GFP_KERNEL); + if (!leds) + return -ENOMEM; + + chip->client = client; + mutex_init(&chip->lock); + i2c_set_clientdata(client, chip); + + ret = lp5812_init_device(chip); + if (ret) + return ret; + + ret = lp5812_register_leds(leds, chip); + if (ret) + goto err_out; + + return 0; + +err_out: + lp5812_deinit_device(chip); + return ret; +} + +static void lp5812_remove(struct i2c_client *client) +{ + struct lp5812_chip *chip = i2c_get_clientdata(client); + + lp5812_deinit_device(chip); +} + +static const struct of_device_id of_lp5812_match[] = { + { .compatible = "ti,lp5812" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, of_lp5812_match); + +static struct i2c_driver lp5812_driver = { + .driver = { + .name = "lp5812", + .of_match_table = of_lp5812_match, + }, + .probe = lp5812_probe, + .remove = lp5812_remove, +}; +module_i2c_driver(lp5812_driver); + +MODULE_DESCRIPTION("Texas Instruments LP5812 LED Driver"); +MODULE_AUTHOR("Jared Zhou "); +MODULE_LICENSE("GPL"); diff --git a/drivers/leds/rgb/leds-lp5812.h b/drivers/leds/rgb/leds-lp5812.h new file mode 100644 index 000000000000..d86af233d57d --- /dev/null +++ b/drivers/leds/rgb/leds-lp5812.h @@ -0,0 +1,172 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * LP5812 Driver Header + * + * Copyright (C) 2025 Texas Instruments + * + * Author: Jared Zhou + */ + +#ifndef _LP5812_H_ +#define _LP5812_H_ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define LP5812_REG_ENABLE 0x0000 +#define LP5812_REG_RESET 0x0023 +#define LP5812_DEV_CONFIG0 0x0001 +#define LP5812_DEV_CONFIG1 0x0002 +#define LP5812_DEV_CONFIG2 0x0003 +#define LP5812_DEV_CONFIG3 0x0004 +#define LP5812_DEV_CONFIG4 0x0005 +#define LP5812_DEV_CONFIG5 0x0006 +#define LP5812_DEV_CONFIG6 0x0007 +#define LP5812_DEV_CONFIG7 0x0008 +#define LP5812_DEV_CONFIG8 0x0009 +#define LP5812_DEV_CONFIG9 0x000A +#define LP5812_DEV_CONFIG10 0x000B +#define LP5812_DEV_CONFIG11 0x000c +#define LP5812_DEV_CONFIG12 0x000D +#define LP5812_CMD_UPDATE 0x0010 +#define LP5812_LED_EN_1 0x0020 +#define LP5812_LED_EN_2 0x0021 +#define LP5812_FAULT_CLEAR 0x0022 +#define LP5812_MANUAL_DC_BASE 0x0030 +#define LP5812_AUTO_DC_BASE 0x0050 +#define LP5812_MANUAL_PWM_BASE 0x0040 + +#define LP5812_TSD_CONFIG_STATUS 0x0300 +#define LP5812_LOD_STATUS 0x0301 +#define LP5812_LSD_STATUS 0x0303 + +#define LP5812_ENABLE 0x01 +#define LP5812_DISABLE 0x00 +#define FAULT_CLEAR_ALL 0x07 +#define TSD_CLEAR_VAL 0x04 +#define LSD_CLEAR_VAL 0x02 +#define LOD_CLEAR_VAL 0x01 +#define LP5812_RESET 0x66 +#define LP5812_DEV_CONFIG12_DEFAULT 0x08 + +#define LP5812_UPDATE_CMD_VAL 0x55 +#define LP5812_REG_ADDR_HIGH_SHIFT 8 +#define LP5812_REG_ADDR_BIT_8_9_MASK 0x03 +#define LP5812_REG_ADDR_LOW_MASK 0xFF +#define LP5812_CHIP_ADDR_SHIFT 2 +#define LP5812_DATA_LENGTH 2 +#define LP5812_DATA_BYTE_0_IDX 0 +#define LP5812_DATA_BYTE_1_IDX 1 + +#define LP5812_READ_MSG_LENGTH 2 +#define LP5812_MSG_0_IDX 0 +#define LP5812_MSG_1_IDX 1 +#define LP5812_CFG_ERR_STATUS_MASK 0x01 +#define LP5812_CFG_TSD_STATUS_SHIFT 1 +#define LP5812_CFG_TSD_STATUS_MASK 0x01 + +#define LP5812_FAULT_CLEAR_LOD 0 +#define LP5812_FAULT_CLEAR_LSD 1 +#define LP5812_FAULT_CLEAR_TSD 2 +#define LP5812_FAULT_CLEAR_ALL 3 +#define LP5812_NUMBER_LED_IN_REG 8 + +#define LP5812_WAIT_DEVICE_STABLE_MIN 1000 +#define LP5812_WAIT_DEVICE_STABLE_MAX 1100 + +#define LP5812_LSD_LOD_START_UP 0x0B +#define LP5812_MODE_NAME_MAX_LEN 20 +#define LP5812_MODE_DIRECT_NAME "direct_mode" +#define LP5812_MODE_DIRECT_VALUE 0 +#define LP5812_MODE_MIX_SELECT_LED_0 0 +#define LP5812_MODE_MIX_SELECT_LED_1 1 +#define LP5812_MODE_MIX_SELECT_LED_2 2 +#define LP5812_MODE_MIX_SELECT_LED_3 3 + +enum control_mode { + LP5812_MODE_MANUAL = 0, + LP5812_MODE_AUTONOMOUS +}; + +enum dimming_type { + LP5812_DIMMING_ANALOG, + LP5812_DIMMING_PWM +}; + +union u_scan_order { + struct { + u8 scan_order_0:2; + u8 scan_order_1:2; + u8 scan_order_2:2; + u8 scan_order_3:2; + } s_scan_order; + u8 scan_order_val; +}; + +union u_drive_mode { + struct { + u8 mix_sel_led_0:1; + u8 mix_sel_led_1:1; + u8 mix_sel_led_2:1; + u8 mix_sel_led_3:1; + u8 led_mode:3; + u8 pwm_fre:1; + } s_drive_mode; + u8 drive_mode_val; +}; + +struct lp5812_reg { + u16 addr; + union { + u8 val; + u8 mask; + u8 shift; + }; +}; + +struct lp5812_mode_mapping { + char mode_name[LP5812_MODE_NAME_MAX_LEN]; + u8 mode; + u8 scan_order_0; + u8 scan_order_1; + u8 scan_order_2; + u8 scan_order_3; + u8 selection_led; +}; + +struct lp5812_led_config { + bool is_sc_led; + const char *name; + u8 color_id[LED_COLOR_ID_MAX]; + u32 max_current[LED_COLOR_ID_MAX]; + int chan_nr; + int num_colors; + int led_id[LED_COLOR_ID_MAX]; +}; + +struct lp5812_chip { + u8 num_channels; + struct i2c_client *client; + struct mutex lock; /* Protects register access */ + struct lp5812_led_config *led_config; + const char *label; + const char *scan_mode; + union u_scan_order u_scan_order; + union u_drive_mode u_drive_mode; +}; + +struct lp5812_led { + u8 brightness; + int chan_nr; + struct led_classdev cdev; + struct led_classdev_mc mc_cdev; + struct lp5812_chip *chip; +}; + +#endif /*_LP5812_H_*/ -- 2.25.1