From: Luca Weiss <luca@z3ntu.xyz> To: linux-leds@vger.kernel.org Cc: Dan Murphy <dmurphy@ti.com>, Heiko Stuebner <heiko@sntech.de>, Icenowy Zheng <icenowy@aosc.io>, Jacek Anaszewski <jacek.anaszewski@gmail.com>, Laurent Pinchart <laurent.pinchart@ideasonboard.com>, Mark Rutland <mark.rutland@arm.com>, Maxime Ripard <mripard@kernel.org>, Pavel Machek <pavel@ucw.cz>, Rob Herring <robh+dt@kernel.org>, Shawn Guo <shawnguo@kernel.org>, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, ~postmarketos/upstreaming@lists.sr.ht, Luca Weiss <luca@z3ntu.xyz> Subject: [PATCH 3/3] leds: add sgm3140 driver Date: Mon, 9 Mar 2020 21:35:58 +0100 Message-ID: <20200309203558.305725-4-luca@z3ntu.xyz> (raw) In-Reply-To: <20200309203558.305725-1-luca@z3ntu.xyz> Add a driver for the SGMICRO SGM3140 Buck/Boost Charge Pump LED driver. This device is controlled by two GPIO pins, one for enabling and the second one for switching between torch and flash mode. Signed-off-by: Luca Weiss <luca@z3ntu.xyz> --- Changes since RFC: - address review comments from Jacek Anaszewski: - implement strobe_get op - implement timeout_set op - init v4l2_sd_cfg variable - remove init_data.devicename assignemnt - use devm_ version of led_classdev_flash_register_ext - release child_node in case of success drivers/leds/Kconfig | 9 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-sgm3140.c | 260 ++++++++++++++++++++++++++++++++++++ 3 files changed, 270 insertions(+) create mode 100644 drivers/leds/leds-sgm3140.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 4b68520ac251..9206fc66799d 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -836,6 +836,15 @@ config LEDS_LM36274 Say Y to enable the LM36274 LED driver for TI LMU devices. This supports the LED device LM36274. +config LEDS_SGM3140 + tristate "LED support for the SGM3140" + depends on LEDS_CLASS_FLASH + depends on V4L2_FLASH_LED_CLASS || !V4L2_FLASH_LED_CLASS + depends on OF + help + This option enables support for the SGM3140 500mA Buck/Boost Charge + Pump LED Driver. + comment "LED Triggers" source "drivers/leds/trigger/Kconfig" diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 2da39e896ce8..38d57dd53e4b 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -85,6 +85,7 @@ obj-$(CONFIG_LEDS_LM3601X) += leds-lm3601x.o obj-$(CONFIG_LEDS_TI_LMU_COMMON) += leds-ti-lmu-common.o obj-$(CONFIG_LEDS_LM3697) += leds-lm3697.o obj-$(CONFIG_LEDS_LM36274) += leds-lm36274.o +obj-$(CONFIG_LEDS_SGM3140) += leds-sgm3140.o # LED SPI Drivers obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o diff --git a/drivers/leds/leds-sgm3140.c b/drivers/leds/leds-sgm3140.c new file mode 100644 index 000000000000..357f4cbb279a --- /dev/null +++ b/drivers/leds/leds-sgm3140.c @@ -0,0 +1,260 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2020 Luca Weiss <luca@z3ntu.xyz> + +#include <linux/gpio/consumer.h> +#include <linux/led-class-flash.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> + +#include <media/v4l2-flash-led-class.h> + +#define FLASH_TIMEOUT_DEFAULT 250000 /* 250ms */ +#define FLASH_MAX_TIMEOUT_DEFAULT 300000 /* 300ms */ + +struct sgm3140 { + struct gpio_desc *flash_gpio; + struct gpio_desc *enable_gpio; + + /* current timeout in us */ + u32 timeout; + /* maximum timeout in us */ + u32 max_timeout; + + struct led_classdev_flash fled_cdev; + struct v4l2_flash *v4l2_flash; + + struct timer_list powerdown_timer; +}; + +static struct sgm3140 *flcdev_to_sgm3140(struct led_classdev_flash *flcdev) +{ + return container_of(flcdev, struct sgm3140, fled_cdev); +} + +static int sgm3140_strobe_set(struct led_classdev_flash *fled_cdev, bool state) +{ + struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev); + + if (state) { + gpiod_set_value_cansleep(priv->flash_gpio, 1); + gpiod_set_value_cansleep(priv->enable_gpio, 1); + mod_timer(&priv->powerdown_timer, + jiffies + usecs_to_jiffies(priv->timeout)); + } else { + gpiod_set_value_cansleep(priv->enable_gpio, 0); + gpiod_set_value_cansleep(priv->flash_gpio, 0); + del_timer_sync(&priv->powerdown_timer); + } + + return 0; +} + +static int sgm3140_strobe_get(struct led_classdev_flash *fled_cdev, bool *state) +{ + struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev); + + *state = timer_pending(&priv->powerdown_timer); + + return 0; +} + +static int sgm3140_timeout_set(struct led_classdev_flash *fled_cdev, u32 timeout) +{ + struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev); + + priv->timeout = timeout; + + return 0; +} + +struct led_flash_ops sgm3140_flash_ops = { + .strobe_set = sgm3140_strobe_set, + .strobe_get = sgm3140_strobe_get, + .timeout_set = sgm3140_timeout_set, +}; + +int sgm3140_brightness_set(struct led_classdev *led_cdev, + enum led_brightness brightness) +{ + struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); + struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev); + + if (brightness == LED_OFF) + gpiod_set_value_cansleep(priv->enable_gpio, 0); + else + gpiod_set_value_cansleep(priv->enable_gpio, 1); + + return 0; +} + +static void sgm3140_powerdown_timer(struct timer_list *t) +{ + struct sgm3140 *priv = from_timer(priv, t, powerdown_timer); + + gpiod_set_value_cansleep(priv->enable_gpio, 0); + gpiod_set_value_cansleep(priv->flash_gpio, 0); +} + +static void sgm3140_init_flash_timeout(struct sgm3140 *priv) +{ + struct led_classdev_flash *fled_cdev = &priv->fled_cdev; + struct led_flash_setting *s; + + /* Init flash timeout setting */ + s = &fled_cdev->timeout; + s->min = 1; + s->max = priv->max_timeout; + s->step = 1; + s->val = FLASH_TIMEOUT_DEFAULT; +} + +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS) +static void sgm3140_init_v4l2_flash_config(struct sgm3140 *priv, + struct v4l2_flash_config *v4l2_sd_cfg) +{ + struct led_classdev *led_cdev = &priv->fled_cdev.led_cdev; + struct led_flash_setting *s; + + strlcpy(v4l2_sd_cfg->dev_name, led_cdev->dev->kobj.name, + sizeof(v4l2_sd_cfg->dev_name)); + + /* Init flash intensity setting */ + s = &v4l2_sd_cfg->intensity; + s->min = 0; + s->max = 1; + s->step = 1; + s->val = 1; +} + +#else +static void sgm3140_init_v4l2_flash_config(struct sgm3140 *priv, + struct v4l2_flash_config *v4l2_sd_cfg) +{ +} +#endif + +static int sgm3140_probe(struct platform_device *pdev) +{ + struct sgm3140 *priv; + struct led_classdev *led_cdev; + struct led_classdev_flash *fled_cdev; + struct led_init_data init_data = {}; + struct device_node *child_node; + struct v4l2_flash_config v4l2_sd_cfg = {}; + int ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->flash_gpio = devm_gpiod_get(&pdev->dev, "flash", GPIOD_OUT_LOW); + ret = PTR_ERR_OR_ZERO(priv->flash_gpio); + if (ret) { + if (ret != -EPROBE_DEFER) + dev_err(&pdev->dev, "Failed to request flash gpio: %d\n", + ret); + return ret; + } + + priv->enable_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW); + ret = PTR_ERR_OR_ZERO(priv->enable_gpio); + if (ret) { + if (ret != -EPROBE_DEFER) + dev_err(&pdev->dev, "Failed to request enable gpio: %d\n", + ret); + return ret; + } + + child_node = of_get_next_available_child(pdev->dev.of_node, NULL); + if (!child_node) { + dev_err(&pdev->dev, "No DT child node found for connected LED.\n"); + return -EINVAL; + } + + + ret = of_property_read_u32(child_node, "flash-max-timeout-us", + &priv->max_timeout); + if (ret < 0) { + priv->max_timeout = FLASH_MAX_TIMEOUT_DEFAULT; + dev_warn(&pdev->dev, "flash-max-timeout-us DT property missing\n"); + } + + /* + * Set default timeout to FLASH_DEFAULT_TIMEOUT except if max_timeout + * from DT is lower. + */ + priv->timeout = min(priv->max_timeout, (u32)FLASH_TIMEOUT_DEFAULT); + + timer_setup(&priv->powerdown_timer, sgm3140_powerdown_timer, 0); + + fled_cdev = &priv->fled_cdev; + led_cdev = &fled_cdev->led_cdev; + + fled_cdev->ops = &sgm3140_flash_ops; + + led_cdev->brightness_set_blocking = sgm3140_brightness_set; + led_cdev->max_brightness = LED_ON; + led_cdev->flags |= LED_DEV_CAP_FLASH; + + sgm3140_init_flash_timeout(priv); + + init_data.fwnode = of_fwnode_handle(child_node); + + platform_set_drvdata(pdev, priv); + + /* Register in the LED subsystem */ + ret = devm_led_classdev_flash_register_ext(&pdev->dev, fled_cdev, &init_data); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to register flash device: %d\n", + ret); + goto err; + } + + sgm3140_init_v4l2_flash_config(priv, &v4l2_sd_cfg); + + /* Create V4L2 Flash subdev */ + priv->v4l2_flash = v4l2_flash_init(&pdev->dev, of_fwnode_handle(child_node), + fled_cdev, NULL, + &v4l2_sd_cfg); + if (IS_ERR(priv->v4l2_flash)) { + ret = PTR_ERR(priv->v4l2_flash); + goto err; + } + +err: + of_node_put(child_node); + return ret; +} + +static int sgm3140_remove(struct platform_device *pdev) +{ + struct sgm3140 *priv = platform_get_drvdata(pdev); + + del_timer_sync(&priv->powerdown_timer); + + v4l2_flash_release(priv->v4l2_flash); + + return 0; +} + +static const struct of_device_id sgm3140_dt_match[] = { + { .compatible = "sgmicro,sgm3140" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, sgm3140_dt_match); + +static struct platform_driver sgm3140_driver = { + .probe = sgm3140_probe, + .remove = sgm3140_remove, + .driver = { + .name = "sgm3140", + .of_match_table = sgm3140_dt_match, + }, +}; + +module_platform_driver(sgm3140_driver); + +MODULE_AUTHOR("Luca Weiss <luca@z3ntu.xyz>"); +MODULE_DESCRIPTION("SG Micro SGM3140 charge pump led driver"); +MODULE_LICENSE("GPL v2"); -- 2.25.1
next prev parent reply index Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-03-09 20:35 [PATCH 0/3] Add sgm3140 flash led driver Luca Weiss 2020-03-09 20:35 ` [PATCH 1/3] dt-bindings: Add vendor prefix for SG Micro Corp Luca Weiss 2020-03-23 20:54 ` Rob Herring 2020-03-09 20:35 ` [PATCH 2/3] dt-bindings: leds: Add binding for sgm3140 Luca Weiss 2020-03-09 22:22 ` Sakari Ailus 2020-03-11 12:49 ` Dan Murphy 2020-03-15 10:47 ` Luca Weiss 2020-03-15 10:53 ` Laurent Pinchart 2020-03-23 21:30 ` Dan Murphy 2020-03-23 20:57 ` Rob Herring 2020-03-24 20:02 ` Luca Weiss 2020-03-09 20:35 ` Luca Weiss [this message] 2020-03-09 22:18 ` [PATCH 3/3] leds: add sgm3140 driver Sakari Ailus 2020-03-09 22:49 ` Pavel Machek 2020-03-09 22:52 ` Luca Weiss 2020-03-11 13:02 ` Dan Murphy 2020-03-11 21:09 ` Jacek Anaszewski 2020-03-15 10:42 ` Luca Weiss
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