drivers/power/supply/sc2731_charger.c

Source file repositories/reference/linux-study-clean/drivers/power/supply/sc2731_charger.c

File Facts

System
Linux kernel
Corpus path
drivers/power/supply/sc2731_charger.c
Extension
.c
Size
12861 bytes
Lines
540
Domain
Driver Families
Bucket
drivers/power
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 sc2731_charger_info {
	struct device *dev;
	struct regmap *regmap;
	struct usb_phy *usb_phy;
	struct notifier_block usb_notify;
	struct power_supply *psy_usb;
	struct work_struct work;
	struct mutex lock;
	bool charging;
	u32 base;
	u32 limit;
};

static void sc2731_charger_stop_charge(struct sc2731_charger_info *info)
{
	regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
			   SC2731_CC_EN, 0);

	regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
			   SC2731_CHARGER_PD, SC2731_CHARGER_PD);
}

static int sc2731_charger_start_charge(struct sc2731_charger_info *info)
{
	int ret;

	/* Enable charger constant current mode */
	ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
				 SC2731_CC_EN, SC2731_CC_EN);
	if (ret)
		return ret;

	/* Start charging */
	return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
				  SC2731_CHARGER_PD, 0);
}

static int sc2731_charger_set_current_limit(struct sc2731_charger_info *info,
					    u32 limit)
{
	u32 val;

	if (limit <= SC2731_CURRENT_LIMIT_100)
		val = 0;
	else if (limit <= SC2731_CURRENT_LIMIT_500)
		val = 3;
	else if (limit <= SC2731_CURRENT_LIMIT_900)
		val = 2;
	else
		val = 1;

	return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG5,
				  SC2731_CUR_LIMIT_MASK,
				  val << SC2731_CUR_LIMIT_SHIFT);
}

static int sc2731_charger_set_current(struct sc2731_charger_info *info, u32 cur)
{
	u32 val;
	int ret;

	if (cur > SC2731_CURRENT_LIMIT_2000)
		cur = SC2731_CURRENT_LIMIT_2000;
	else if (cur < SC2731_CURRENT_PRECHG)
		cur = SC2731_CURRENT_PRECHG;

	/* Calculate the step value, each step is 50 mA */
	val = (cur - SC2731_CURRENT_PRECHG) / SC2731_CURRENT_STEP;

	/* Set pre-charge current as 450 mA */
	ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
				 SC2731_PRECHG_RNG_MASK,
				 0x3 << SC2731_PRECHG_RNG_SHIFT);
	if (ret)
		return ret;

	return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG1,
				  SC2731_CUR_MASK, val);
}

static int sc2731_charger_get_status(struct sc2731_charger_info *info)
{
	u32 val;
	int ret;

	ret = regmap_read(info->regmap, SC2731_CHARGE_STATUS, &val);
	if (ret)
		return ret;

	if (val & SC2731_CHARGE_FULL)

Annotation

Implementation Notes