drivers/rtc/rtc-ab-eoz9.c

Source file repositories/reference/linux-study-clean/drivers/rtc/rtc-ab-eoz9.c

File Facts

System
Linux kernel
Corpus path
drivers/rtc/rtc-ab-eoz9.c
Extension
.c
Size
14674 bytes
Lines
567
Domain
Driver Families
Bucket
drivers/rtc
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 abeoz9_rtc_data {
	struct rtc_device *rtc;
	struct regmap *regmap;
	struct device *hwmon_dev;
};

static int abeoz9_check_validity(struct device *dev)
{
	struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
	struct regmap *regmap = data->regmap;
	int ret;
	int val;

	ret = regmap_read(regmap, ABEOZ9_REG_CTRL_STATUS, &val);
	if (ret < 0) {
		dev_err(dev,
			"unable to get CTRL_STATUS register (%d)\n", ret);
		return ret;
	}

	if (val & ABEOZ9_REG_CTRL_STATUS_PON) {
		dev_warn(dev, "power-on reset detected, date is invalid\n");
		return -EINVAL;
	}

	if (val & ABEOZ9_REG_CTRL_STATUS_V1F) {
		dev_warn(dev,
			 "voltage drops below VLOW1 threshold, date is invalid\n");
		return -EINVAL;
	}

	if ((val & ABEOZ9_REG_CTRL_STATUS_V2F)) {
		dev_warn(dev,
			 "voltage drops below VLOW2 threshold, date is invalid\n");
		return -EINVAL;
	}

	return 0;
}

static int abeoz9_reset_validity(struct regmap *regmap)
{
	return regmap_update_bits(regmap, ABEOZ9_REG_CTRL_STATUS,
				  ABEOZ9_REG_CTRL_STATUS_V1F |
				  ABEOZ9_REG_CTRL_STATUS_V2F |
				  ABEOZ9_REG_CTRL_STATUS_PON,
				  0);
}

static int abeoz9_rtc_get_time(struct device *dev, struct rtc_time *tm)
{
	struct abeoz9_rtc_data *data = dev_get_drvdata(dev);
	u8 regs[ABEOZ9_SEC_LEN];
	int ret;

	ret = abeoz9_check_validity(dev);
	if (ret)
		return ret;

	ret = regmap_bulk_read(data->regmap, ABEOZ9_REG_SEC,
			       regs,
			       sizeof(regs));
	if (ret) {
		dev_err(dev, "reading RTC time failed (%d)\n", ret);
		return ret;
	}

	tm->tm_sec = bcd2bin(regs[ABEOZ9_REG_SEC - ABEOZ9_REG_SEC] & 0x7F);
	tm->tm_min = bcd2bin(regs[ABEOZ9_REG_MIN - ABEOZ9_REG_SEC] & 0x7F);

	if (regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] & ABEOZ9_HOURS_PM) {
		tm->tm_hour =
			bcd2bin(regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] & 0x1f);
		if (regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC] & ABEOZ9_HOURS_PM)
			tm->tm_hour += 12;
	} else {
		tm->tm_hour = bcd2bin(regs[ABEOZ9_REG_HOURS - ABEOZ9_REG_SEC]);
	}

	tm->tm_mday = bcd2bin(regs[ABEOZ9_REG_DAYS - ABEOZ9_REG_SEC]);
	tm->tm_wday = bcd2bin(regs[ABEOZ9_REG_WEEKDAYS - ABEOZ9_REG_SEC]);
	tm->tm_mon  = bcd2bin(regs[ABEOZ9_REG_MONTHS - ABEOZ9_REG_SEC]) - 1;
	tm->tm_year = bcd2bin(regs[ABEOZ9_REG_YEARS - ABEOZ9_REG_SEC]) + 100;

	return ret;
}

static int abeoz9_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct abeoz9_rtc_data *data = dev_get_drvdata(dev);

Annotation

Implementation Notes