drivers/leds/leds-da9052.c

Source file repositories/reference/linux-study-clean/drivers/leds/leds-da9052.c

File Facts

System
Linux kernel
Corpus path
drivers/leds/leds-da9052.c
Extension
.c
Size
4516 bytes
Lines
190
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 da9052_led {
	struct led_classdev cdev;
	struct da9052 *da9052;
	unsigned char led_index;
	unsigned char id;
};

static unsigned char led_reg[] = {
	DA9052_LED_CONT_4_REG,
	DA9052_LED_CONT_5_REG,
};

static int da9052_set_led_brightness(struct da9052_led *led,
				     enum led_brightness brightness)
{
	u8 val;
	int error;

	val = (brightness & 0x7f) | DA9052_LED_CONT_DIM;

	error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
	if (error < 0)
		dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
			error);
	return error;
}

static int da9052_led_set(struct led_classdev *led_cdev,
			   enum led_brightness value)
{
	struct da9052_led *led =
			container_of(led_cdev, struct da9052_led, cdev);

	return da9052_set_led_brightness(led, value);
}

static int da9052_configure_leds(struct da9052 *da9052)
{
	int error;
	unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
				       | DA9052_SET_HIGH_LVL_OUTPUT;

	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
				  DA9052_MASK_LOWER_NIBBLE,
				  register_value);

	if (error < 0) {
		dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
			error);
		return error;
	}

	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
				  DA9052_MASK_UPPER_NIBBLE,
				  register_value << DA9052_NIBBLE_SHIFT);
	if (error < 0)
		dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
			error);

	return error;
}

static int da9052_led_probe(struct platform_device *pdev)
{
	struct da9052_pdata *pdata;
	struct da9052 *da9052;
	struct led_platform_data *pled;
	struct da9052_led *led = NULL;
	int error = -ENODEV;
	int i;

	da9052 = dev_get_drvdata(pdev->dev.parent);
	pdata = dev_get_platdata(da9052->dev);
	if (pdata == NULL) {
		dev_err(&pdev->dev, "No platform data\n");
		goto err;
	}

	pled = pdata->pled;
	if (pled == NULL) {
		dev_err(&pdev->dev, "No platform data for LED\n");
		goto err;
	}

	led = devm_kcalloc(&pdev->dev,
			   pled->num_leds, sizeof(struct da9052_led),
			   GFP_KERNEL);
	if (!led) {
		error = -ENOMEM;
		goto err;

Annotation

Implementation Notes