drivers/leds/leds-pm8058.c

Source file repositories/reference/linux-study-clean/drivers/leds/leds-pm8058.c

File Facts

System
Linux kernel
Corpus path
drivers/leds/leds-pm8058.c
Extension
.c
Size
4308 bytes
Lines
183
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 pm8058_led {
	struct regmap *map;
	u32 reg;
	u32 ledtype;
	struct led_classdev cdev;
};

static void pm8058_led_set(struct led_classdev *cled,
	enum led_brightness value)
{
	struct pm8058_led *led;
	int ret = 0;
	unsigned int mask = 0;
	unsigned int val = 0;

	led = container_of(cled, struct pm8058_led, cdev);
	switch (led->ledtype) {
	case PM8058_LED_TYPE_COMMON:
		mask = PM8058_LED_TYPE_COMMON_MASK;
		val = value << PM8058_LED_TYPE_COMMON_SHIFT;
		break;
	case PM8058_LED_TYPE_KEYPAD:
	case PM8058_LED_TYPE_FLASH:
		mask = PM8058_LED_TYPE_KEYPAD_MASK;
		val = value << PM8058_LED_TYPE_KEYPAD_SHIFT;
		break;
	default:
		break;
	}

	ret = regmap_update_bits(led->map, led->reg, mask, val);
	if (ret)
		pr_err("Failed to set LED brightness\n");
}

static enum led_brightness pm8058_led_get(struct led_classdev *cled)
{
	struct pm8058_led *led;
	int ret;
	unsigned int val;

	led = container_of(cled, struct pm8058_led, cdev);

	ret = regmap_read(led->map, led->reg, &val);
	if (ret) {
		pr_err("Failed to get LED brightness\n");
		return LED_OFF;
	}

	switch (led->ledtype) {
	case PM8058_LED_TYPE_COMMON:
		val &= PM8058_LED_TYPE_COMMON_MASK;
		val >>= PM8058_LED_TYPE_COMMON_SHIFT;
		break;
	case PM8058_LED_TYPE_KEYPAD:
	case PM8058_LED_TYPE_FLASH:
		val &= PM8058_LED_TYPE_KEYPAD_MASK;
		val >>= PM8058_LED_TYPE_KEYPAD_SHIFT;
		break;
	default:
		val = LED_OFF;
		break;
	}

	return val;
}

static int pm8058_led_probe(struct platform_device *pdev)
{
	struct led_init_data init_data = {};
	struct device *dev = &pdev->dev;
	struct pm8058_led *led;
	struct device_node *np;
	int ret;
	struct regmap *map;
	enum led_brightness maxbright;
	enum led_default_state state;

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

	led->ledtype = (u32)(unsigned long)of_device_get_match_data(dev);

	map = dev_get_regmap(dev->parent, NULL);
	if (!map) {
		dev_err(dev, "Parent regmap unavailable.\n");
		return -ENXIO;
	}
	led->map = map;

Annotation

Implementation Notes