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Sverdlin" X-Patchwork-Id: 847973 Received: from mta-64-226.siemens.flowmailer.net (mta-64-226.siemens.flowmailer.net [185.136.64.226]) (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 DF21122068F for ; Fri, 6 Dec 2024 17:48:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.136.64.226 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733507344; cv=none; b=Yw5OKAxuSZoIgP0k4zUtoqDdyYSBQDrEN6y9Eiz01BZbp/P7ld5MIk9TKt9OkW3n1cRhOVDRgc2kTnG1oHRMKTZGNVyl61+jfTK10AahwOD3AoeuVernFcTDsxKoUCAi2TT3hCxaRzafKnm4YKCbfGvznBlse3UNUGR8AdnBTvk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733507344; c=relaxed/simple; bh=FIrpJaVLZP5iAZsFWKrxZsQ/1cv8NaemLoZty8gCsbg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XE31Y8ztFULZRSfKxjYZKUca02rFZiriw2Pyy4dpTX6ChJ2B9ZxZhNgoYCTL+2PmxTAViaYjlLp3isEMjcTEJPGsg4ds0FIy/jyCkgzqD0BfdLSwlIs7lEC8qK7jHmLSx4KYYg2HnIZPYdTFTs0mxbUVibNiu+X3lfIkMtvz8nc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=siemens.com; spf=pass smtp.mailfrom=rts-flowmailer.siemens.com; dkim=pass (2048-bit key) header.d=siemens.com header.i=alexander.sverdlin@siemens.com header.b=dq9XSGFG; arc=none smtp.client-ip=185.136.64.226 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=siemens.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rts-flowmailer.siemens.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=siemens.com header.i=alexander.sverdlin@siemens.com header.b="dq9XSGFG" Received: by mta-64-226.siemens.flowmailer.net with ESMTPSA id 20241206170840f7e1cc5a2a3242cd20 for ; Fri, 06 Dec 2024 18:08:40 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; s=fm2; d=siemens.com; i=alexander.sverdlin@siemens.com; h=Date:From:Subject:To:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:Cc:References:In-Reply-To; bh=O1U6B92QInT24F+zuJGFeS5+Da6wGoI/umcLEfXgUp8=; b=dq9XSGFGCWguHksVQ2d1MD6z1A0xEpGuPSMw1RmtDQl5YfY4QFMpW5UAfV9MMCzPSRWlGK 3z7REitsRTfPyBkhMWbsXXYRGcc3nBxwmzfB04x3ZO748iwFlDnk/VSDKoQaP/7Mik9oupZF 7fz+Xs4i/c0MLBWIKHmfSYCWl49exOdpwWahmacrzgWqVnDVlCgJJrWm1FdWcpiOCHlE20np VOkU+iCNJuWhWMyXv+XL36eWxqXOe7tDkIync4wMjFfLtTEPBDsbw2XSFYLhx71Uk8j32SGK WZ3Yx2QQg3xcx9D9VjkbC7oG4m7pjwDHMyIOGyWOq1fD82KhxXpezAiw==; From: "A. Sverdlin" To: Dan Murphy , linux-leds@vger.kernel.org, devicetree@vger.kernel.org Cc: Alexander Sverdlin , dri-devel@lists.freedesktop.org, Lee Jones , Daniel Thompson , Jingoo Han , Pavel Machek , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Andrew Davis Subject: [PATCH 2/2] leds: lp8864: New driver Date: Fri, 6 Dec 2024 18:07:13 +0100 Message-ID: <20241206170717.1090206-3-alexander.sverdlin@siemens.com> In-Reply-To: <20241206170717.1090206-1-alexander.sverdlin@siemens.com> References: <20241206170717.1090206-1-alexander.sverdlin@siemens.com> Precedence: bulk X-Mailing-List: linux-leds@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Flowmailer-Platform: Siemens Feedback-ID: 519:519-456497:519-21489:flowmailer From: Alexander Sverdlin Add driver for TI LP8864, LP8864S, LP8866 4/6 channel LED-backlight drivers with I2C interface. Link: https://www.ti.com/lit/gpn/lp8866-q1 Link: https://www.ti.com/lit/gpn/lp8864-q1 Link: https://www.ti.com/lit/gpn/lp8864s-q1 Signed-off-by: Alexander Sverdlin --- MAINTAINERS | 7 + drivers/leds/Kconfig | 12 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-lp8864.c | 320 +++++++++++++++++++++++++++++++++++++ 4 files changed, 340 insertions(+) create mode 100644 drivers/leds/leds-lp8864.c diff --git a/MAINTAINERS b/MAINTAINERS index 21f855fe468bc..14e87b6b37b8a 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -23262,6 +23262,13 @@ S: Supported F: Documentation/devicetree/bindings/iio/dac/ti,dac7612.yaml F: drivers/iio/dac/ti-dac7612.c +TEXAS INSTRUMENTS' LB8864 LED BACKLIGHT DRIVER +M: Alexander Sverdlin +L: linux-leds@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/leds/backlight/ti,lp8860.yaml +F: drivers/leds/leds-lp8864.c + TEXAS INSTRUMENTS' SYSTEM CONTROL INTERFACE (TISCI) PROTOCOL DRIVER M: Nishanth Menon M: Tero Kristo diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index b784bb74a8378..6d0e88e501614 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -511,6 +511,18 @@ config LEDS_LP8860 on the LP8860 4 channel LED driver using the I2C communication bus. +config LEDS_LP8864 + tristate "LED support for the TI LP8864/LP8866 4/6 channel LED drivers" + depends on LEDS_CLASS && I2C && OF + select REGMAP_I2C + help + If you say yes here you get support for the TI LP8864-Q1, + LP8864S-Q1, LP8866-Q1, LP8866S-Q1 4/6 channel LED backlight + drivers with I2C interface. + + To compile this driver as a module, choose M here: the + module will be called leds-lp8864. + config LEDS_CLEVO_MAIL tristate "Mail LED on Clevo notebook" depends on LEDS_CLASS && BROKEN diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 18afbb5a23ee5..f66bf2e13665f 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -57,6 +57,7 @@ obj-$(CONFIG_LEDS_LP55XX_COMMON) += leds-lp55xx-common.o obj-$(CONFIG_LEDS_LP8501) += leds-lp8501.o obj-$(CONFIG_LEDS_LP8788) += leds-lp8788.o obj-$(CONFIG_LEDS_LP8860) += leds-lp8860.o +obj-$(CONFIG_LEDS_LP8864) += leds-lp8864.o obj-$(CONFIG_LEDS_LT3593) += leds-lt3593.o obj-$(CONFIG_LEDS_MAX5970) += leds-max5970.o obj-$(CONFIG_LEDS_MAX77650) += leds-max77650.o diff --git a/drivers/leds/leds-lp8864.c b/drivers/leds/leds-lp8864.c new file mode 100644 index 0000000000000..da02e29bbf4b7 --- /dev/null +++ b/drivers/leds/leds-lp8864.c @@ -0,0 +1,320 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * TI LP8864/LP8866 4/6 Channel LED Driver + * + * Copyright (C) 2024 Siemens AG + * + * Based on LP8860 driver by Dan Murphy + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define LP8864_BRT_CONTROL 0x00 +#define LP8864_USER_CONFIG1 0x04 +#define LP8864_BRT_MODE_MASK GENMASK(9, 8) +/* Brightness controlled by DISPLAY_BRT register */ +#define LP8864_BRT_MODE_REG BIT(9) +#define LP8864_SUPPLY_STATUS 0x0e +#define LP8864_BOOST_STATUS 0x10 +#define LP8864_LED_STATUS 0x12 +/* Writeable bits in the LED_STATUS register */ +#define LP8864_LED_STATUS_WR_MASK GENMASK(14, 9) + +/* Textual meaning for every register bit */ +static const char *const lp8864_supply_status_msg[] = { + NULL, "Vin under-voltage fault", + NULL, "Vin over-voltage fault", + NULL, "Vdd under-voltage fault", + NULL, "Vin over-current fault", + NULL, "Missing charge pump fault", + NULL, "Charge pump fault", + NULL, "Missing boost sync fault", + NULL, "CRC error fault ", +}; + +/* Textual meaning for every register bit */ +static const char *const lp8864_boost_status_msg[] = { + NULL, "Boost OVP low fault", + NULL, "Boost OVP high fault", + NULL, "Boost over-current fault", + NULL, "Missing boost FSET resistor fault", + NULL, "Missing MODE SEL resistor fault", + NULL, "Missing LED resistor fault", + NULL, "ISET resistor short to ground fault", + NULL, "Thermal shutdown fault", +}; + +/* Textual meaning for every register bit */ +static const char *const lp8864_led_status_msg[] = { + "LED 1 fault", + "LED 2 fault", + "LED 3 fault", + "LED 4 fault", + "LED 5 fault", + "LED 6 fault", + "LED open fault", + "LED internal short fault", + "LED short to GND fault", + NULL, NULL, NULL, + "Invalid string configuration fault", + NULL, + "I2C time out fault", +}; + +/** + * struct lp8864_led + * @client: Pointer to the I2C client + * @led_dev: led class device pointer + * @regmap: Devices register map + * @led_status_mask: Helps to report LED fault only once + */ +struct lp8864_led { + struct i2c_client *client; + struct led_classdev led_dev; + struct regmap *regmap; + u16 led_status_mask; +}; + +static int lp8864_fault_check(struct lp8864_led *led) +{ + int ret, i; + unsigned int buf; + + ret = regmap_read(led->regmap, LP8864_SUPPLY_STATUS, &buf); + if (ret) + goto err; + + for (i = 0; i < ARRAY_SIZE(lp8864_supply_status_msg); i++) + if (lp8864_supply_status_msg[i] && buf & BIT(i)) + dev_err(&led->client->dev, "%s\n", + lp8864_supply_status_msg[i]); + + /* + * Clear bits have an index preceding the corresponding Status bits; + * both have to be written "1" simultaneously to clear the corresponding + * Status bit. + */ + if (buf) + ret = regmap_write(led->regmap, LP8864_SUPPLY_STATUS, + buf >> 1 | buf); + if (ret) + goto err; + + ret = regmap_read(led->regmap, LP8864_BOOST_STATUS, &buf); + if (ret) + goto err; + + for (i = 0; i < ARRAY_SIZE(lp8864_boost_status_msg); i++) + if (lp8864_boost_status_msg[i] && buf & BIT(i)) + dev_err(&led->client->dev, "%s\n", + lp8864_boost_status_msg[i]); + + if (buf) + ret = regmap_write(led->regmap, LP8864_BOOST_STATUS, + buf >> 1 | buf); + if (ret) + goto err; + + ret = regmap_read(led->regmap, LP8864_LED_STATUS, &buf); + if (ret) + goto err; + + /* + * Clear already reported faults that maintain their value until device + * power-down + */ + buf &= ~led->led_status_mask; + + for (i = 0; i < ARRAY_SIZE(lp8864_led_status_msg); i++) + if (lp8864_led_status_msg[i] && buf & BIT(i)) + dev_err(&led->client->dev, "%s\n", + lp8864_led_status_msg[i]); + + /* + * Mark those which maintain their value until device power-down as + * "already reported" + */ + led->led_status_mask |= buf & ~LP8864_LED_STATUS_WR_MASK; + + /* + * Only bits 14, 12, 10 have to be cleared here, but others are RO, + * we don't care what we write to them. + */ + if (buf & LP8864_LED_STATUS_WR_MASK) + ret = regmap_write(led->regmap, LP8864_LED_STATUS, + buf >> 1 | buf); + if (ret) + goto err; + + return 0; + +err: + dev_err(&led->client->dev, "Cannot read/clear faults (%pe)\n", + ERR_PTR(ret)); + + return ret; +} + +static int lp8864_brightness_set(struct led_classdev *led_cdev, + enum led_brightness brt_val) +{ + struct lp8864_led *led = container_of(led_cdev, struct lp8864_led, + led_dev); + unsigned int val = brt_val * 0xffff / LED_FULL; + int ret; + + ret = lp8864_fault_check(led); + if (ret) + return ret; + + ret = regmap_write(led->regmap, LP8864_BRT_CONTROL, val); + if (ret) + dev_err(&led->client->dev, "Cannot write BRT_CONTROL\n"); + + return ret; +} + +static enum led_brightness lp8864_brightness_get(struct led_classdev *led_cdev) +{ + struct lp8864_led *led = container_of(led_cdev, struct lp8864_led, + led_dev); + unsigned int buf; + int ret; + + ret = regmap_read(led->regmap, LP8864_BRT_CONTROL, &buf); + if (ret) { + dev_err(&led->client->dev, "Cannot read BRT_CONTROL\n"); + return ret; + } + + return buf * LED_FULL / 0xffff; +} + +static int lp8864_init(struct lp8864_led *led) +{ + int ret; + + /* Control brightness by DISPLAY_BRT register */ + ret = regmap_update_bits(led->regmap, LP8864_USER_CONFIG1, + LP8864_BRT_MODE_MASK, LP8864_BRT_MODE_REG); + if (ret) { + dev_err(&led->client->dev, "Cannot write USER_CONFIG1\n"); + return ret; + } + + return lp8864_fault_check(led); +} + +static const struct regmap_config lp8864_regmap_config = { + .reg_bits = 8, + .val_bits = 16, + .val_format_endian = REGMAP_ENDIAN_LITTLE, + .cache_type = REGCACHE_NONE, +}; + +static void lp8864_disable_gpio(void *data) +{ + struct gpio_desc *gpio = data; + + gpiod_set_value(gpio, 0); +} + +static int lp8864_probe(struct i2c_client *client) +{ + int ret; + struct lp8864_led *led; + struct device_node *np = dev_of_node(&client->dev); + struct device_node *child_node; + struct led_init_data init_data = {}; + struct gpio_desc *enable_gpio; + + led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL); + if (!led) + return -ENOMEM; + + child_node = of_get_next_available_child(np, NULL); + if (!child_node) { + dev_err(&client->dev, "No LED function defined\n"); + return -EINVAL; + } + + ret = devm_regulator_get_enable_optional(&client->dev, "vled"); + if (ret && ret != -ENODEV) + return dev_err_probe(&client->dev, ret, + "Failed to enable vled regulator (%pe)\n", + ERR_PTR(ret)); + + enable_gpio = devm_gpiod_get_optional(&client->dev, "enable", + GPIOD_OUT_HIGH); + if (IS_ERR(enable_gpio)) + return dev_err_probe(&client->dev, PTR_ERR(enable_gpio), + "Failed to get enable GPIO (%pe)\n", + enable_gpio); + + ret = devm_add_action_or_reset(&client->dev, lp8864_disable_gpio, + enable_gpio); + + led->client = client; + led->led_dev.brightness_set_blocking = lp8864_brightness_set; + led->led_dev.brightness_get = lp8864_brightness_get; + + i2c_set_clientdata(client, led); + + led->regmap = devm_regmap_init_i2c(client, &lp8864_regmap_config); + if (IS_ERR(led->regmap)) { + dev_err(&client->dev, "Failed to allocate register map (%pe)\n", + led->regmap); + return PTR_ERR(led->regmap); + } + + ret = lp8864_init(led); + if (ret) + return ret; + + init_data.fwnode = of_fwnode_handle(child_node); + init_data.devicename = "lp8864"; + init_data.default_label = ":display_cluster"; + + ret = devm_led_classdev_register_ext(&client->dev, &led->led_dev, + &init_data); + if (ret) + dev_err(&client->dev, "Failed to register LED device (%pe)\n", + ERR_PTR(ret)); + + return ret; +} + +static const struct i2c_device_id lp8864_id[] = { + { "lp8864" }, + {} +}; +MODULE_DEVICE_TABLE(i2c, lp8864_id); + +static const struct of_device_id of_lp8864_leds_match[] = { + { .compatible = "ti,lp8864" }, + {} +}; +MODULE_DEVICE_TABLE(of, of_lp8864_leds_match); + +static struct i2c_driver lp8864_driver = { + .driver = { + .name = "lp8864", + .of_match_table = of_lp8864_leds_match, + }, + .probe = lp8864_probe, + .id_table = lp8864_id, +}; +module_i2c_driver(lp8864_driver); + +MODULE_DESCRIPTION("Texas Instruments LP8864/LP8866 LED driver"); +MODULE_AUTHOR("Alexander Sverdlin "); +MODULE_LICENSE("GPL");