drivers/leds/leds-bd2606mvv.c

Source file repositories/reference/linux-study-clean/drivers/leds/leds-bd2606mvv.c

File Facts

System
Linux kernel
Corpus path
drivers/leds/leds-bd2606mvv.c
Extension
.c
Size
3960 bytes
Lines
158
Domain
Driver Families
Bucket
drivers/leds
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct bd2606mvv_led {
	unsigned int led_no;
	struct led_classdev ldev;
	struct bd2606mvv_priv *priv;
};

struct bd2606mvv_priv {
	struct bd2606mvv_led leds[BD2606_MAX_LEDS];
	struct regmap *regmap;
};

static int
bd2606mvv_brightness_set(struct led_classdev *led_cdev,
		      enum led_brightness brightness)
{
	struct bd2606mvv_led *led = ldev_to_led(led_cdev);
	struct bd2606mvv_priv *priv = led->priv;
	int err;

	if (brightness == 0)
		return regmap_update_bits(priv->regmap,
					  BD2606_REG_PWRCNT,
					  1 << led->led_no,
					  0);

	/* shared brightness register */
	err = regmap_write(priv->regmap, led->led_no / 2,
			   led_cdev->max_brightness == 1 ?
			   BD2606_MAX_BRIGHTNESS : brightness);
	if (err)
		return err;

	return regmap_update_bits(priv->regmap,
				  BD2606_REG_PWRCNT,
				  1 << led->led_no,
				  1 << led->led_no);
}

static const struct regmap_config bd2606mvv_regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = 0x3,
};

static int bd2606mvv_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct bd2606mvv_priv *priv;
	struct fwnode_handle *led_fwnodes[BD2606_MAX_LEDS] = { 0 };
	int active_pairs[BD2606_MAX_LEDS / 2] = { 0 };
	int err, reg;
	int i, j;

	if (!dev_fwnode(dev))
		return -ENODEV;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->regmap = devm_regmap_init_i2c(client, &bd2606mvv_regmap);
	if (IS_ERR(priv->regmap)) {
		err = PTR_ERR(priv->regmap);
		dev_err(dev, "Failed to allocate register map: %d\n", err);
		return err;
	}

	i2c_set_clientdata(client, priv);

	device_for_each_child_node_scoped(dev, child) {
		struct bd2606mvv_led *led;

		err = fwnode_property_read_u32(child, "reg", &reg);
		if (err)
			return err;

		if (reg < 0 || reg >= BD2606_MAX_LEDS || led_fwnodes[reg])
			return -EINVAL;

		led = &priv->leds[reg];
		led_fwnodes[reg] = fwnode_handle_get(child);
		active_pairs[reg / 2]++;
		led->priv = priv;
		led->led_no = reg;
		led->ldev.brightness_set_blocking = bd2606mvv_brightness_set;
		led->ldev.max_brightness = BD2606_MAX_BRIGHTNESS;
	}

	for (i = 0; i < BD2606_MAX_LEDS; i++) {
		struct led_init_data init_data = {};

Annotation

Implementation Notes