Re: [PATCH v1 1/2] leds: rt4505: Add support for Richtek RT4505 flash led controller

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Hi Pavel, ChiYuan,

On 10/27/20 9:29 AM, Pavel Machek wrote:
Hi!

From: ChiYuan Huang <cy_huang@xxxxxxxxxxx>

Add support for RT4505 flash led controller. It can support up to 1.5A
flash current with hardware timeout and low input voltage
protection.

Please use upper-case "LED" everywhere.

This should be 2nd in the series, after DT changes.

Signed-off-by: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
---
  drivers/leds/Kconfig       |  11 ++
  drivers/leds/Makefile      |   1 +
  drivers/leds/leds-rt4505.c | 397 +++++++++++++++++++++++++++++++++++++++++++++
  3 files changed, 409 insertions(+)
  create mode 100644 drivers/leds/leds-rt4505.c
[...]
+static int rt4505_torch_brightness_set(struct led_classdev *lcdev, enum led_brightness level)
+{

80 columns, where easy.

+	struct rt4505_priv *priv = container_of(lcdev, struct rt4505_priv, flash.led_cdev);
+	u32 val = 0;
+	int ret;
+
+	mutex_lock(&priv->lock);
+
+	if (level != LED_OFF) {
+		ret = regmap_update_bits(priv->regmap, RT4505_REG_ILED, RT4505_ITORCH_MASK,
+					 (level - 1) << RT4505_ITORCH_SHIFT);
+		if (ret)
+			goto unlock;
+
+		val = RT4505_TORCH_SET;
+	}
+
+	ret = regmap_update_bits(priv->regmap, RT4505_REG_ENABLE, RT4505_ENABLE_MASK, val);
+
+unlock:
+	mutex_unlock(&priv->lock);
+	return ret;
+}

Why is the locking needed? What will the /sys/class/leds interface
look like on system with your flash?

The locking is needed since this can be called via led_set_brightness()
from any place in the kernel, and especially from triggers.

--
Best regards,
Jacek Anaszewski



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