drivers/power/supply/wm831x_backup.c

Source file repositories/reference/linux-study-clean/drivers/power/supply/wm831x_backup.c

File Facts

System
Linux kernel
Corpus path
drivers/power/supply/wm831x_backup.c
Extension
.c
Size
5218 bytes
Lines
212
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 wm831x_backup {
	struct wm831x *wm831x;
	struct power_supply *backup;
	struct power_supply_desc backup_desc;
	char name[20];
};

static int wm831x_backup_read_voltage(struct wm831x *wm831x,
				     enum wm831x_auxadc src,
				     union power_supply_propval *val)
{
	int ret;

	ret = wm831x_auxadc_read_uv(wm831x, src);
	if (ret >= 0)
		val->intval = ret;

	return ret;
}

/*********************************************************************
 *		Backup supply properties
 *********************************************************************/

static void wm831x_config_backup(struct wm831x *wm831x)
{
	struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
	struct wm831x_backup_pdata *pdata;
	int ret, reg;

	if (!wm831x_pdata || !wm831x_pdata->backup) {
		dev_warn(wm831x->dev,
			 "No backup battery charger configuration\n");
		return;
	}

	pdata = wm831x_pdata->backup;

	reg = 0;

	if (pdata->charger_enable)
		reg |= WM831X_BKUP_CHG_ENA | WM831X_BKUP_BATT_DET_ENA;
	if (pdata->no_constant_voltage)
		reg |= WM831X_BKUP_CHG_MODE;

	switch (pdata->vlim) {
	case 2500:
		break;
	case 3100:
		reg |= WM831X_BKUP_CHG_VLIM;
		break;
	default:
		dev_err(wm831x->dev, "Invalid backup voltage limit %dmV\n",
			pdata->vlim);
	}

	switch (pdata->ilim) {
	case 100:
		break;
	case 200:
		reg |= 1;
		break;
	case 300:
		reg |= 2;
		break;
	case 400:
		reg |= 3;
		break;
	default:
		dev_err(wm831x->dev, "Invalid backup current limit %duA\n",
			pdata->ilim);
	}

	ret = wm831x_reg_unlock(wm831x);
	if (ret != 0) {
		dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret);
		return;
	}

	ret = wm831x_set_bits(wm831x, WM831X_BACKUP_CHARGER_CONTROL,
			      WM831X_BKUP_CHG_ENA_MASK |
			      WM831X_BKUP_CHG_MODE_MASK |
			      WM831X_BKUP_BATT_DET_ENA_MASK |
			      WM831X_BKUP_CHG_VLIM_MASK |
			      WM831X_BKUP_CHG_ILIM_MASK,
			      reg);
	if (ret != 0)
		dev_err(wm831x->dev,
			"Failed to set backup charger config: %d\n", ret);

Annotation

Implementation Notes