From patchwork Fri May 30 18:42:21 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukas Timmermann X-Patchwork-Id: 893453 Received: from mout-p-101.mailbox.org (mout-p-101.mailbox.org [80.241.56.151]) (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 843EC277032; Fri, 30 May 2025 18:50:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=80.241.56.151 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748631030; cv=none; b=aIddKXtpcJhT2HL6HBEFzAe8s7OtDaauiv76Ve2+vmhxgS6qbqK4TzWWGzBPDOI6Z4SW2QffYuQnr/WcQ+XKebJBvqiKdGG/J0XWO0RD5JBFX8rc9TlVkmRtqFplOHTlyCllCgWwk+FHG4TyEH7m8pDuyfrDA/Gz+KB1Gr3qW7M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748631030; c=relaxed/simple; bh=MdwIl4EQeRjVnOgLv1c9KkHZGR/XGGH2xz3WYu6RX34=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hTwyqHqwrRZq3b/gJdUxAwovE5MyPEPS5zP3RJeZix56zC60rLnAmlCsJr4NJkF5TdXE1P97P2pl2gcOasa13YQbP9sAzj6dzhyLlKj5VZiLH5IrVB2jTevvvpdCXNFWvjFg+8Ihk3PdBCq8PPGza12CvzaDRkTmdtqWCRTX60k= 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=80.241.56.151 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 smtp102.mailbox.org (smtp102.mailbox.org [IPv6:2001:67c:2050:b231:465::102]) (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-101.mailbox.org (Postfix) with ESMTPS id 4b8Bv34lCCz9t5w; Fri, 30 May 2025 20:42:55 +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 1/2] leds: as3668: Driver for the ams Osram 4-channel i2c LED driver Date: Fri, 30 May 2025 20:42:21 +0200 Message-ID: <20250530184219.78085-5-linux@timmermann.space> In-Reply-To: <20250530184219.78085-3-linux@timmermann.space> References: <20250530184219.78085-3-linux@timmermann.space> Precedence: bulk X-Mailing-List: linux-leds@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Rspamd-Queue-Id: 4b8Bv34lCCz9t5w From: Lukas Timmermann Document Osram as3668 LED driver devicetree bindings. --- drivers/leds/Kconfig | 10 +++ drivers/leds/Makefile | 1 + drivers/leds/leds-as3668.c | 178 +++++++++++++++++++++++++++++++++++++ 3 files changed, 189 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..f9448c12d170 --- /dev/null +++ b/drivers/leds/leds-as3668.c @@ -0,0 +1,178 @@ +// 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) +{ + return i2c_smbus_write_byte_data(client, reg, value); +} + +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; + int i = 0; + + for_each_available_child_of_node_scoped(dev_of_node(dev), child) { + of_property_read_u8(child, "reg", &i); + + if (i < 0 || i > AS3668_MAX_LEDS) + return dev_err_probe(dev, -EOPNOTSUPP, "Unsupported led reg %d\n", i); + + 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) + return dev_err_probe(dev, err, "Failed to register %d LED\n", i); + } + + 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, 4), 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");