Commit efbbb4fd authored by Alexandre Belloni's avatar Alexandre Belloni
Browse files

rtc: rx8025: check time validity when necessary 



Check time validity when reading time as this is when we need to know.

Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
parent 5c66e1e0

drivers/rtc/rtc-rx8025.c

+29 −29
Original line number Diff line number Diff line
@@ -104,6 +104,31 @@ static s32 rx8025_write_regs(const struct i2c_client *client, 
					      length, values);

}



static int rx8025_check_validity(struct device *dev)

{

	struct rx8025_data *rx8025 = dev_get_drvdata(dev);

	int ctrl2;



	ctrl2 = rx8025_read_reg(rx8025->client, RX8025_REG_CTRL2);

	if (ctrl2 < 0)

		return ctrl2;



	if (ctrl2 & RX8025_BIT_CTRL2_VDET)

		dev_warn(dev, "power voltage drop detected\n");



	if (ctrl2 & RX8025_BIT_CTRL2_PON) {

		dev_warn(dev, "power-on reset detected, date is invalid\n");

		return -EINVAL;

	}



	if (!(ctrl2 & RX8025_BIT_CTRL2_XST)) {

		dev_warn(dev, "crystal stopped, date is invalid\n");

		return -EINVAL;

	}



	return 0;

}



static int rx8025_reset_validity(struct i2c_client *client)

{

	int ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
@@ -154,21 +179,11 @@ static int rx8025_get_time(struct device *dev, struct rtc_time *dt) 
{

	struct rx8025_data *rx8025 = dev_get_drvdata(dev);

	u8 date[7];

	int ctrl, err;



	ctrl = rx8025_read_reg(rx8025->client, RX8025_REG_CTRL2);

	if (ctrl < 0)

		return ctrl;



	if (ctrl & RX8025_BIT_CTRL2_PON) {

		dev_warn(dev, "power-on reset detected, date is invalid\n");

		return -EINVAL;

	}

	int err;



	if (!(ctrl & RX8025_BIT_CTRL2_XST)) {

		dev_warn(dev, "crystal stopped, date is invalid\n");

		return -EINVAL;

	}

	err = rx8025_check_validity(dev);

	if (err)

		return err;



	err = rx8025_read_regs(rx8025->client, RX8025_REG_SEC, 7, date);

	if (err)
@@ -250,21 +265,6 @@ static int rx8025_init_client(struct i2c_client *client) 
	/* Keep test bit zero ! */

	rx8025->ctrl1 = ctrl[0] & ~RX8025_BIT_CTRL1_TEST;



	if (ctrl[1] & RX8025_BIT_CTRL2_PON) {

		dev_warn(&client->dev, "power-on reset was detected, "

			 "you may have to readjust the clock\n");

	}



	if (ctrl[1] & RX8025_BIT_CTRL2_VDET) {

		dev_warn(&client->dev, "a power voltage drop was detected, "

			 "you may have to readjust the clock\n");

	}



	if (!(ctrl[1] & RX8025_BIT_CTRL2_XST)) {

		dev_warn(&client->dev, "Oscillation stop was detected,"

			 "you may have to readjust the clock\n");

	}



	if (ctrl[1] & (RX8025_BIT_CTRL2_DAFG | RX8025_BIT_CTRL2_WAFG)) {

		dev_warn(&client->dev, "Alarm was detected\n");

		need_clear = 1;