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Subject[PATCH 3/3] leds: add sgm3140 driver
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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
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