leds: add sgm3140 driver
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> Signed-off-by: Pavel Machek <pavel@ucw.cz>
This commit is contained in:
Luca Weiss
Pavel Machek
parent
ea4407fa90
commit
cef8ec8cbd
@ -868,6 +868,14 @@ config LEDS_IP30
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To compile this driver as a module, choose M here: the module
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will be called leds-ip30.
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config LEDS_SGM3140
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tristate "LED support for the SGM3140"
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depends on LEDS_CLASS_FLASH
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depends on V4L2_FLASH_LED_CLASS || !V4L2_FLASH_LED_CLASS
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help
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This option enables support for the SGM3140 500mA Buck/Boost Charge
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Pump LED Driver.
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comment "LED Triggers"
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source "drivers/leds/trigger/Kconfig"
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@ -78,6 +78,7 @@ obj-$(CONFIG_LEDS_PWM) += leds-pwm.o
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obj-$(CONFIG_LEDS_REGULATOR) += leds-regulator.o
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obj-$(CONFIG_LEDS_S3C24XX) += leds-s3c24xx.o
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obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o
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obj-$(CONFIG_LEDS_SGM3140) += leds-sgm3140.o
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obj-$(CONFIG_LEDS_SUNFIRE) += leds-sunfire.o
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obj-$(CONFIG_LEDS_SYSCON) += leds-syscon.o
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obj-$(CONFIG_LEDS_TCA6507) += leds-tca6507.o
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320
drivers/leds/leds-sgm3140.c
Normal file
320
drivers/leds/leds-sgm3140.c
Normal file
@ -0,0 +1,320 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2020 Luca Weiss <luca@z3ntu.xyz>
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#include <linux/gpio/consumer.h>
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#include <linux/led-class-flash.h>
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#include <linux/module.h>
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#include <linux/regulator/consumer.h>
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#include <linux/platform_device.h>
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#include <media/v4l2-flash-led-class.h>
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#define FLASH_TIMEOUT_DEFAULT 250000U /* 250ms */
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#define FLASH_MAX_TIMEOUT_DEFAULT 300000U /* 300ms */
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struct sgm3140 {
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struct led_classdev_flash fled_cdev;
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struct v4l2_flash *v4l2_flash;
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struct timer_list powerdown_timer;
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struct gpio_desc *flash_gpio;
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struct gpio_desc *enable_gpio;
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struct regulator *vin_regulator;
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bool enabled;
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/* current timeout in us */
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u32 timeout;
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/* maximum timeout in us */
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u32 max_timeout;
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};
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static struct sgm3140 *flcdev_to_sgm3140(struct led_classdev_flash *flcdev)
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{
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return container_of(flcdev, struct sgm3140, fled_cdev);
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}
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static int sgm3140_strobe_set(struct led_classdev_flash *fled_cdev, bool state)
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{
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struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev);
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int ret;
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if (priv->enabled == state)
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return 0;
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if (state) {
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ret = regulator_enable(priv->vin_regulator);
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if (ret) {
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dev_err(fled_cdev->led_cdev.dev,
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"failed to enable regulator: %d\n", ret);
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return ret;
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}
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gpiod_set_value_cansleep(priv->flash_gpio, 1);
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gpiod_set_value_cansleep(priv->enable_gpio, 1);
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mod_timer(&priv->powerdown_timer,
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jiffies + usecs_to_jiffies(priv->timeout));
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} else {
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del_timer_sync(&priv->powerdown_timer);
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gpiod_set_value_cansleep(priv->enable_gpio, 0);
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gpiod_set_value_cansleep(priv->flash_gpio, 0);
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ret = regulator_disable(priv->vin_regulator);
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if (ret) {
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dev_err(fled_cdev->led_cdev.dev,
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"failed to disable regulator: %d\n", ret);
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return ret;
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}
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}
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priv->enabled = state;
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return 0;
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}
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static int sgm3140_strobe_get(struct led_classdev_flash *fled_cdev, bool *state)
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{
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struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev);
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*state = timer_pending(&priv->powerdown_timer);
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return 0;
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}
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static int sgm3140_timeout_set(struct led_classdev_flash *fled_cdev,
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u32 timeout)
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{
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struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev);
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priv->timeout = timeout;
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return 0;
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}
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static const struct led_flash_ops sgm3140_flash_ops = {
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.strobe_set = sgm3140_strobe_set,
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.strobe_get = sgm3140_strobe_get,
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.timeout_set = sgm3140_timeout_set,
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};
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static int sgm3140_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness brightness)
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{
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struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev);
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struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev);
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bool enable = brightness == LED_ON;
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int ret;
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if (priv->enabled == enable)
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return 0;
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if (enable) {
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ret = regulator_enable(priv->vin_regulator);
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if (ret) {
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dev_err(led_cdev->dev,
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"failed to enable regulator: %d\n", ret);
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return ret;
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}
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gpiod_set_value_cansleep(priv->enable_gpio, 1);
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} else {
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gpiod_set_value_cansleep(priv->enable_gpio, 0);
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ret = regulator_disable(priv->vin_regulator);
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if (ret) {
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dev_err(led_cdev->dev,
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"failed to disable regulator: %d\n", ret);
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return ret;
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}
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}
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priv->enabled = enable;
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return 0;
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}
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static void sgm3140_powerdown_timer(struct timer_list *t)
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{
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struct sgm3140 *priv = from_timer(priv, t, powerdown_timer);
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gpiod_set_value(priv->enable_gpio, 0);
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gpiod_set_value(priv->flash_gpio, 0);
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regulator_disable(priv->vin_regulator);
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priv->enabled = false;
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}
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static void sgm3140_init_flash_timeout(struct sgm3140 *priv)
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{
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struct led_classdev_flash *fled_cdev = &priv->fled_cdev;
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struct led_flash_setting *s;
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/* Init flash timeout setting */
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s = &fled_cdev->timeout;
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s->min = 1;
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s->max = priv->max_timeout;
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s->step = 1;
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s->val = FLASH_TIMEOUT_DEFAULT;
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}
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#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
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static void sgm3140_init_v4l2_flash_config(struct sgm3140 *priv,
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struct v4l2_flash_config *v4l2_sd_cfg)
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{
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struct led_classdev *led_cdev = &priv->fled_cdev.led_cdev;
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struct led_flash_setting *s;
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strscpy(v4l2_sd_cfg->dev_name, led_cdev->dev->kobj.name,
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sizeof(v4l2_sd_cfg->dev_name));
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/* Init flash intensity setting */
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s = &v4l2_sd_cfg->intensity;
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s->min = 0;
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s->max = 1;
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s->step = 1;
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s->val = 1;
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}
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#else
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static void sgm3140_init_v4l2_flash_config(struct sgm3140 *priv,
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struct v4l2_flash_config *v4l2_sd_cfg)
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{
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}
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#endif
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static int sgm3140_probe(struct platform_device *pdev)
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{
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struct sgm3140 *priv;
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struct led_classdev *led_cdev;
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struct led_classdev_flash *fled_cdev;
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struct led_init_data init_data = {};
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struct fwnode_handle *child_node;
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struct v4l2_flash_config v4l2_sd_cfg = {};
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int ret;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->flash_gpio = devm_gpiod_get(&pdev->dev, "flash", GPIOD_OUT_LOW);
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ret = PTR_ERR_OR_ZERO(priv->flash_gpio);
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if (ret) {
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if (ret != -EPROBE_DEFER)
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dev_err(&pdev->dev,
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"Failed to request flash gpio: %d\n", ret);
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return ret;
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}
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priv->enable_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW);
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ret = PTR_ERR_OR_ZERO(priv->enable_gpio);
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if (ret) {
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if (ret != -EPROBE_DEFER)
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dev_err(&pdev->dev,
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"Failed to request enable gpio: %d\n", ret);
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return ret;
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}
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priv->vin_regulator = devm_regulator_get(&pdev->dev, "vin");
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ret = PTR_ERR_OR_ZERO(priv->vin_regulator);
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if (ret) {
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if (ret != -EPROBE_DEFER)
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dev_err(&pdev->dev,
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"Failed to request regulator: %d\n", ret);
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return ret;
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}
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child_node = fwnode_get_next_available_child_node(pdev->dev.fwnode,
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NULL);
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if (!child_node) {
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dev_err(&pdev->dev,
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"No fwnode child node found for connected LED.\n");
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return -EINVAL;
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}
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ret = fwnode_property_read_u32(child_node, "flash-max-timeout-us",
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&priv->max_timeout);
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if (ret) {
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priv->max_timeout = FLASH_MAX_TIMEOUT_DEFAULT;
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dev_warn(&pdev->dev,
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"flash-max-timeout-us property missing\n");
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}
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/*
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* Set default timeout to FLASH_DEFAULT_TIMEOUT except if max_timeout
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* from DT is lower.
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*/
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priv->timeout = min(priv->max_timeout, FLASH_TIMEOUT_DEFAULT);
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timer_setup(&priv->powerdown_timer, sgm3140_powerdown_timer, 0);
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fled_cdev = &priv->fled_cdev;
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led_cdev = &fled_cdev->led_cdev;
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fled_cdev->ops = &sgm3140_flash_ops;
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led_cdev->brightness_set_blocking = sgm3140_brightness_set;
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led_cdev->max_brightness = LED_ON;
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led_cdev->flags |= LED_DEV_CAP_FLASH;
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sgm3140_init_flash_timeout(priv);
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init_data.fwnode = child_node;
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platform_set_drvdata(pdev, priv);
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/* Register in the LED subsystem */
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ret = devm_led_classdev_flash_register_ext(&pdev->dev,
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fled_cdev, &init_data);
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if (ret) {
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dev_err(&pdev->dev, "Failed to register flash device: %d\n",
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ret);
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goto err;
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}
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sgm3140_init_v4l2_flash_config(priv, &v4l2_sd_cfg);
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/* Create V4L2 Flash subdev */
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priv->v4l2_flash = v4l2_flash_init(&pdev->dev,
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child_node,
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fled_cdev, NULL,
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&v4l2_sd_cfg);
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if (IS_ERR(priv->v4l2_flash)) {
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ret = PTR_ERR(priv->v4l2_flash);
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goto err;
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}
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return ret;
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err:
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fwnode_handle_put(child_node);
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return ret;
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}
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static int sgm3140_remove(struct platform_device *pdev)
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{
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struct sgm3140 *priv = platform_get_drvdata(pdev);
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del_timer_sync(&priv->powerdown_timer);
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v4l2_flash_release(priv->v4l2_flash);
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return 0;
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}
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static const struct of_device_id sgm3140_dt_match[] = {
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{ .compatible = "sgmicro,sgm3140" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, sgm3140_dt_match);
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static struct platform_driver sgm3140_driver = {
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.probe = sgm3140_probe,
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.remove = sgm3140_remove,
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.driver = {
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.name = "sgm3140",
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.of_match_table = sgm3140_dt_match,
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},
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};
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module_platform_driver(sgm3140_driver);
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MODULE_AUTHOR("Luca Weiss <luca@z3ntu.xyz>");
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MODULE_DESCRIPTION("SG Micro SGM3140 charge pump led driver");
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MODULE_LICENSE("GPL v2");
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