From: Sakari Ailus <sakari.ailus@iki.fi> To: Luca Weiss <luca@z3ntu.xyz> Cc: linux-leds@vger.kernel.org, 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 Subject: Re: [PATCH 3/3] leds: add sgm3140 driver Date: Tue, 10 Mar 2020 00:18:05 +0200 Message-ID: <20200309221805.GD2619@valkosipuli.retiisi.org.uk> (raw) In-Reply-To: <20200309203558.305725-4-luca@z3ntu.xyz> Hi Luca, Thanks for the patch. On Mon, Mar 09, 2020 at 09:35:58PM +0100, Luca Weiss wrote: > 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 */ Add U, and you can remove the cast elsewhere. > + > +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 = { const? > + .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) static > +{ > + 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); You'll need a work queue to use sleeping gpiod_set. In this case, I'd use gpiod_set_value() instead, as elsewhere. I think it's unlikely you'd come across a board where it'd sleep. > +} > + > +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)); strscpy()? > + > + /* Init flash intensity setting */ > + s = &v4l2_sd_cfg->intensity; > + s->min = 0; > + s->max = 1; > + s->step = 1; > + s->val = 1; > +} > + > +#else The prototype doesn't change. I'd put the #if ... #endif inside the function. Up to you. > +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"); You could wrap this. There are a few more above and below, too. > + 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"); -- Kind regards, Sakari Ailus
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 ` [PATCH 3/3] leds: add sgm3140 driver Luca Weiss 2020-03-09 22:18 ` Sakari Ailus [this message] 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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