From patchwork Sat May 31 12:07:18 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukas Timmermann X-Patchwork-Id: 893593 Received: from mout-p-103.mailbox.org (mout-p-103.mailbox.org [80.241.56.161]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ABDF37260A; Sat, 31 May 2025 12:11:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=80.241.56.161 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748693502; cv=none; b=Q3LteWD6fia/DDX0sEDa7yS01x3HrAUqDNRxh90p6L8KHLCTfZZDQVRBXOcLoX+EhEpYJl6M4vU967j9t13MbiKspOLybor9r5xNW4+RVIjqSoQN9emoUXo/F7jcV6KSKSWj/pBY/34ezByP3Ps0xH94RxOCKl3t5dHNjm3VHR8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748693502; c=relaxed/simple; bh=/8+CPHkd+SNv/bK+WKJCa28M+x6KDqAIx3Tzlggq2zw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bm4/95YTBzBnvRcrOlorsZNVi42rxG3awZbJMI44CFX19mWpIqqKe8wueCyce54mms6hJPnvZkB3bmFRihPl9EfoviRlxI05r8bSDX1+MxVWqBd+nMHOp5OFW3Pt4jd+sKh2oluFNPPK8mXOetILNNGUI0XGIqhN9Qilr02b9KY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=timmermann.space; spf=pass smtp.mailfrom=timmermann.space; arc=none smtp.client-ip=80.241.56.161 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=timmermann.space Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=timmermann.space Received: from smtp1.mailbox.org (smtp1.mailbox.org [10.196.197.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-103.mailbox.org (Postfix) with ESMTPS id 4b8f940QbLz9skH; Sat, 31 May 2025 14:11:36 +0200 (CEST) From: Lukas Timmermann To: lee@kernel.org, pavel@kernel.org Cc: linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org, Lukas Timmermann Subject: [PATCH v2 1/2] leds: as3668: Driver for the ams Osram 4-channel i2c Date: Sat, 31 May 2025 14:07:18 +0200 Message-ID: <20250531120715.302870-6-linux@timmermann.space> In-Reply-To: <20250531120715.302870-4-linux@timmermann.space> References: <20250531120715.302870-4-linux@timmermann.space> Precedence: bulk X-Mailing-List: linux-leds@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Lukas Timmermann This is the actual driver for the as3668. There were no related drivers in the kernel until now, so I created a new file. I've checked around for relatives of the as3668 but all of them are quite different, which is why wrote the driver just for the as3668. --- drivers/leds/Kconfig | 10 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-as3668.c | 192 +++++++++++++++++++++++++++++++++++++ 3 files changed, 203 insertions(+) create mode 100644 drivers/leds/leds-as3668.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index a104cbb0a001..56477c170f0a 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -100,6 +100,16 @@ config LEDS_ARIEL Say Y to if your machine is a Dell Wyse 3020 thin client. +config LEDS_AS3668 + tristate "LED support for AMS AS3668" + depends on LEDS_CLASS + depends on I2C + help + This option enables support for the AMS AS3668 LED controller. + + To compile this driver as a module, choose M here: the module + will be called leds-as3668. + config LEDS_AW200XX tristate "LED support for Awinic AW20036/AW20054/AW20072/AW20108" depends on LEDS_CLASS diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 2f170d69dcbf..983811384fec 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_LEDS_ADP5520) += leds-adp5520.o obj-$(CONFIG_LEDS_AN30259A) += leds-an30259a.o obj-$(CONFIG_LEDS_APU) += leds-apu.o obj-$(CONFIG_LEDS_ARIEL) += leds-ariel.o +obj-$(CONFIG_LEDS_AS3668) += leds-as3668.o obj-$(CONFIG_LEDS_AW200XX) += leds-aw200xx.o obj-$(CONFIG_LEDS_AW2013) += leds-aw2013.o obj-$(CONFIG_LEDS_BCM6328) += leds-bcm6328.o diff --git a/drivers/leds/leds-as3668.c b/drivers/leds/leds-as3668.c new file mode 100644 index 000000000000..0168e1d89e9e --- /dev/null +++ b/drivers/leds/leds-as3668.c @@ -0,0 +1,192 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Osram AMS AS3668 LED Driver IC + * + * Copyright (C) 2025 Lukas Timmermann + */ + +#include +#include +#include +#include + +#define AS3668_MAX_LEDS 4 + +/* Chip Registers */ +#define AS3668_CHIP_ID1 0x3e +#define AS3668_CHIP_ID2 0x3f + +#define AS3668_CHIP_ID2_SERIAL_MASK GENMASK(7, 4) +#define AS3668_CHIP_ID2_REV_MASK GENMASK(3, 0) + +#define AS3668_CURRX_CONTROL 0x01 +#define AS3668_CURR1 0x02 +#define AS3668_CURR2 0x03 +#define AS3668_CURR3 0x04 +#define AS3668_CURR4 0x05 + +/* Constants */ +#define AS3668_CHIP_IDENT 0xa5 +#define AS3668_CHIP_REV1 0x01 + +struct as3668_led { + struct led_classdev cdev; + struct as3668 *chip; + struct fwnode_handle *fwnode; + + int num; +}; + +struct as3668 { + struct i2c_client *client; + struct as3668_led leds[AS3668_MAX_LEDS]; +}; + +static int as3668_read_value(struct i2c_client *client, u8 reg) +{ + return i2c_smbus_read_byte_data(client, reg); +} + +static int as3668_write_value(struct i2c_client *client, u8 reg, u8 value) +{ + int err = i2c_smbus_write_byte_data(client, reg, value); + + if (err) + dev_err(&client->dev, "error writing to reg 0x%tx, returned %d", reg, err); + + return err; +} + +static enum led_brightness as3668_brightness_get(struct led_classdev *cdev) +{ + struct as3668_led *led = container_of(cdev, struct as3668_led, cdev); + + return as3668_read_value(led->chip->client, AS3668_CURR1 + led->num); +} + +static void as3668_brightness_set(struct led_classdev *cdev, enum led_brightness brightness) +{ + struct as3668_led *led = container_of(cdev, struct as3668_led, cdev); + + as3668_write_value(led->chip->client, AS3668_CURR1 + led->num, brightness); +} + +static int as3668_dt_init(struct as3668 *as3668) +{ + struct device *dev = &as3668->client->dev; + struct as3668_led *led; + struct led_init_data init_data = {}; + int err; + u32 reg; + int i = 0; + + for_each_available_child_of_node_scoped(dev_of_node(dev), child) { + err = of_property_read_u32(child, "reg", ®); + if (err) + dev_err(dev, "unable to read device tree led reg, err %d", err); + + i = reg; + + if (i < 0 || i > AS3668_MAX_LEDS) { + dev_err(dev, "unsupported led reg %d\n", i); + return -EOPNOTSUPP; + } + + led = &as3668->leds[i]; + led->fwnode = of_fwnode_handle(child); + + led->num = i; + led->chip = as3668; + + led->cdev.max_brightness = U8_MAX; + led->cdev.brightness_get = as3668_brightness_get; + led->cdev.brightness_set = as3668_brightness_set; + + init_data.fwnode = led->fwnode; + init_data.default_label = ":"; + + err = devm_led_classdev_register_ext(dev, &led->cdev, &init_data); + if (err) { + dev_err(dev, "failed to register %d LED\n", i); + return err; + } + } + + return 0; +} + +static int as3668_probe(struct i2c_client *client) +{ + u8 chip_id1, chip_id2, chip_serial, chip_rev; + struct as3668 *as3668; + + /* Check for sensible i2c address */ + if (client->addr != 0x42) + return dev_err_probe(&client->dev, -EFAULT, "unexpected address for as3668 device\n"); + + /* Read identifier from chip */ + chip_id1 = as3668_read_value(client, AS3668_CHIP_ID1); + + if (chip_id1 != AS3668_CHIP_IDENT) + return dev_err_probe(&client->dev, -ENODEV, "chip reported wrong id: 0x%tx\n", chip_id1); + + /* Check the revision*/ + chip_id2 = as3668_read_value(client, AS3668_CHIP_ID2); + chip_serial = FIELD_GET(AS3668_CHIP_ID2_SERIAL_MASK, chip_id2); + chip_rev = FIELD_GET(AS3668_CHIP_ID2_REV_MASK, chip_id2); + + if (chip_rev != AS3668_CHIP_REV1) + dev_warn(&client->dev, "unexpected chip revision\n"); + + /* Print out information about the chip */ + dev_dbg(&client->dev, "chip_id: 0x%tx | chip_id2: 0x%tx | chip_serial: 0x%tx | chip_rev: 0x%tx\n", chip_id1, chip_id2, chip_serial, chip_rev); + + as3668 = devm_kzalloc(&client->dev, struct_size(as3668, leds, AS3668_MAX_LEDS), GFP_KERNEL); + as3668->client = client; + + as3668_dt_init(as3668); + + /* Initialize the chip */ + as3668_write_value(client, AS3668_CURRX_CONTROL, 0x55); + as3668_write_value(client, AS3668_CURR1, 0x00); + as3668_write_value(client, AS3668_CURR2, 0x00); + as3668_write_value(client, AS3668_CURR3, 0x00); + as3668_write_value(client, AS3668_CURR4, 0x00); + + return 0; +} + +static void as3668_remove(struct i2c_client *client) +{ + as3668_write_value(client, AS3668_CURRX_CONTROL, 0x0); +} + +static const struct i2c_device_id as3668_idtable[] = { + {"as3668"}, + {} +}; + +MODULE_DEVICE_TABLE(i2c, as3668_idtable); + +static const struct of_device_id as3668_match_table[] = { + {.compatible = "ams,as3668"}, + {} +}; + +MODULE_DEVICE_TABLE(of, as3668_match_table); + +static struct i2c_driver as3668_driver = { + .driver = { + .name = "leds_as3668", + .of_match_table = as3668_match_table, + }, + .probe = as3668_probe, + .remove = as3668_remove, + .id_table = as3668_idtable, +}; + +module_i2c_driver(as3668_driver); + +MODULE_AUTHOR("Lukas Timmermann "); +MODULE_DESCRIPTION("AS3668 LED driver"); +MODULE_LICENSE("GPL");