drivers/rtc/rtc-as3722.c

Source file repositories/reference/linux-study-clean/drivers/rtc/rtc-as3722.c

File Facts

System
Linux kernel
Corpus path
drivers/rtc/rtc-as3722.c
Extension
.c
Size
6730 bytes
Lines
253
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 as3722_rtc {
	struct rtc_device	*rtc;
	struct device		*dev;
	struct as3722		*as3722;
	int			alarm_irq;
	bool			irq_enable;
};

static void as3722_time_to_reg(u8 *rbuff, struct rtc_time *tm)
{
	rbuff[0] = bin2bcd(tm->tm_sec);
	rbuff[1] = bin2bcd(tm->tm_min);
	rbuff[2] = bin2bcd(tm->tm_hour);
	rbuff[3] = bin2bcd(tm->tm_mday);
	rbuff[4] = bin2bcd(tm->tm_mon + 1);
	rbuff[5] = bin2bcd(tm->tm_year - (AS3722_RTC_START_YEAR - 1900));
}

static void as3722_reg_to_time(u8 *rbuff, struct rtc_time *tm)
{
	tm->tm_sec = bcd2bin(rbuff[0] & 0x7F);
	tm->tm_min = bcd2bin(rbuff[1] & 0x7F);
	tm->tm_hour = bcd2bin(rbuff[2] & 0x3F);
	tm->tm_mday = bcd2bin(rbuff[3] & 0x3F);
	tm->tm_mon = bcd2bin(rbuff[4] & 0x1F) - 1;
	tm->tm_year = (AS3722_RTC_START_YEAR - 1900) + bcd2bin(rbuff[5] & 0x7F);
	return;
}

static int as3722_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
	struct as3722 *as3722 = as3722_rtc->as3722;
	u8 as_time_array[6];
	int ret;

	ret = as3722_block_read(as3722, AS3722_RTC_SECOND_REG,
			6, as_time_array);
	if (ret < 0) {
		dev_err(dev, "RTC_SECOND reg block read failed %d\n", ret);
		return ret;
	}
	as3722_reg_to_time(as_time_array, tm);
	return 0;
}

static int as3722_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
	struct as3722 *as3722 = as3722_rtc->as3722;
	u8 as_time_array[6];
	int ret;

	if (tm->tm_year < (AS3722_RTC_START_YEAR - 1900))
		return -EINVAL;

	as3722_time_to_reg(as_time_array, tm);
	ret = as3722_block_write(as3722, AS3722_RTC_SECOND_REG, 6,
			as_time_array);
	if (ret < 0)
		dev_err(dev, "RTC_SECOND reg block write failed %d\n", ret);
	return ret;
}

static int as3722_rtc_alarm_irq_enable(struct device *dev,
		unsigned int enabled)
{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);

	if (enabled && !as3722_rtc->irq_enable) {
		enable_irq(as3722_rtc->alarm_irq);
		as3722_rtc->irq_enable = true;
	} else if (!enabled && as3722_rtc->irq_enable)  {
		disable_irq(as3722_rtc->alarm_irq);
		as3722_rtc->irq_enable = false;
	}
	return 0;
}

static int as3722_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
	struct as3722 *as3722 = as3722_rtc->as3722;
	u8 as_time_array[6];
	int ret;

	ret = as3722_block_read(as3722, AS3722_RTC_ALARM_SECOND_REG, 6,
			as_time_array);
	if (ret < 0) {
		dev_err(dev, "RTC_ALARM_SECOND block read failed %d\n", ret);

Annotation

Implementation Notes