drivers/video/backlight/da9052_bl.c

Source file repositories/reference/linux-study-clean/drivers/video/backlight/da9052_bl.c

File Facts

System
Linux kernel
Corpus path
drivers/video/backlight/da9052_bl.c
Extension
.c
Size
4058 bytes
Lines
180
Domain
Driver Families
Bucket
drivers/video
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_bl {
	struct da9052 *da9052;
	uint brightness;
	uint state;
	uint led_reg;
};

static int da9052_adjust_wled_brightness(struct da9052_bl *wleds)
{
	unsigned char boost_en;
	unsigned char i_sink;
	int ret;

	boost_en = 0x3F;
	i_sink = 0xFF;
	if (wleds->state == DA9052_WLEDS_OFF) {
		boost_en = 0x00;
		i_sink = 0x00;
	}

	ret = da9052_reg_write(wleds->da9052, DA9052_BOOST_REG, boost_en);
	if (ret < 0)
		return ret;

	ret = da9052_reg_write(wleds->da9052, DA9052_LED_CONT_REG, i_sink);
	if (ret < 0)
		return ret;

	ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg], 0x0);
	if (ret < 0)
		return ret;

	usleep_range(10000, 11000);

	if (wleds->brightness) {
		ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg],
				       wleds->brightness);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static int da9052_backlight_update_status(struct backlight_device *bl)
{
	int brightness = bl->props.brightness;
	struct da9052_bl *wleds = bl_get_data(bl);

	wleds->brightness = brightness;
	wleds->state = DA9052_WLEDS_ON;

	return da9052_adjust_wled_brightness(wleds);
}

static int da9052_backlight_get_brightness(struct backlight_device *bl)
{
	struct da9052_bl *wleds = bl_get_data(bl);

	return wleds->brightness;
}

static const struct backlight_ops da9052_backlight_ops = {
	.update_status = da9052_backlight_update_status,
	.get_brightness = da9052_backlight_get_brightness,
};

static int da9052_backlight_probe(struct platform_device *pdev)
{
	struct backlight_device *bl;
	struct backlight_properties props;
	struct da9052_bl *wleds;

	wleds = devm_kzalloc(&pdev->dev, sizeof(struct da9052_bl), GFP_KERNEL);
	if (!wleds)
		return -ENOMEM;

	wleds->da9052 = dev_get_drvdata(pdev->dev.parent);
	wleds->brightness = 0;
	wleds->led_reg = platform_get_device_id(pdev)->driver_data;
	wleds->state = DA9052_WLEDS_OFF;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = DA9052_MAX_BRIGHTNESS;

	bl = devm_backlight_device_register(&pdev->dev, pdev->name,
					wleds->da9052->dev, wleds,
					&da9052_backlight_ops, &props);
	if (IS_ERR(bl)) {

Annotation

Implementation Notes