rtc: ds1307: use regmap_update_bits where applicable

After the switch to regmap we can now make use of regmap_update_bits
to simplify read/modify/write ops.

Signed-off-by: Heiner Kallweit <[e-mail]>
Reviewed-by: Linus Walleij <[e-mail]>
Signed-off-by: Alexandre Belloni <[e-mail]>

drivers/rtc/rtc-ds1307.c

···
 {
 	struct ds1307		*ds1307 = dev_id;
 	struct mutex		*lock = &ds1307->rtc->ops_lock;
-	int			stat, control, ret;
+	int			stat, ret;
 
 	mutex_lock(lock);
 	ret = regmap_read(ds1307->regmap, DS1337_REG_STATUS, &stat);
···
 		stat &= ~DS1337_BIT_A1I;
 		regmap_write(ds1307->regmap, DS1337_REG_STATUS, stat);
 
-		ret = regmap_read(ds1307->regmap, DS1337_REG_CONTROL, &control);
+		ret = regmap_update_bits(ds1307->regmap, DS1337_REG_CONTROL,
+					 DS1337_BIT_A1IE, 0);
 		if (ret)
 			goto out;
-
-		control &= ~DS1337_BIT_A1IE;
-		regmap_write(ds1307->regmap, DS1337_REG_CONTROL, control);
 
 		rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
 	}
···
 static int ds1307_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
 	struct ds1307		*ds1307 = dev_get_drvdata(dev);
-	int			control, ret;
 
 	if (!test_bit(HAS_ALARM, &ds1307->flags))
 		return -ENOTTY;
 
-	ret = regmap_read(ds1307->regmap, DS1337_REG_CONTROL, &control);
-	if (ret)
-		return ret;
-
-	if (enabled)
-		control |= DS1337_BIT_A1IE;
-	else
-		control &= ~DS1337_BIT_A1IE;
-
-	return regmap_write(ds1307->regmap, DS1337_REG_CONTROL, control);
+	return regmap_update_bits(ds1307->regmap, DS1337_REG_CONTROL,
+				  DS1337_BIT_A1IE,
+				  enabled ? DS1337_BIT_A1IE : 0);
 }
 
 static const struct rtc_class_ops ds13xx_rtc_ops = {
···
 		goto out;
 
 	/* Disable alarm 0. */
-	ret = regmap_read(ds1307->regmap, MCP794XX_REG_CONTROL, &reg);
-	if (ret)
-		goto out;
-	reg &= ~MCP794XX_BIT_ALM0_EN;
-	ret = regmap_write(ds1307->regmap, MCP794XX_REG_CONTROL, reg);
+	ret = regmap_update_bits(ds1307->regmap, MCP794XX_REG_CONTROL,
+				 MCP794XX_BIT_ALM0_EN, 0);
 	if (ret)
 		goto out;
 
···
 static int mcp794xx_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
 	struct ds1307 *ds1307 = dev_get_drvdata(dev);
-	int reg, ret;
 
 	if (!test_bit(HAS_ALARM, &ds1307->flags))
 		return -EINVAL;
 
-	ret = regmap_read(ds1307->regmap, MCP794XX_REG_CONTROL, &reg);
-	if (ret)
-		return ret;
-
-	if (enabled)
-		reg |= MCP794XX_BIT_ALM0_EN;
-	else
-		reg &= ~MCP794XX_BIT_ALM0_EN;
-
-	return regmap_write(ds1307->regmap, MCP794XX_REG_CONTROL, reg);
+	return regmap_update_bits(ds1307->regmap, MCP794XX_REG_CONTROL,
+				  MCP794XX_BIT_ALM0_EN,
+				  enabled ? MCP794XX_BIT_ALM0_EN : 0);
 }
 
 static const struct rtc_class_ops mcp794xx_rtc_ops = {
···
 static int ds1337_write_control(struct ds1307 *ds1307, u8 mask, u8 value)
 {
 	struct mutex *lock = &ds1307->rtc->ops_lock;
-	int control;
 	int ret;
 
 	mutex_lock(lock);
-
-	ret = regmap_read(ds1307->regmap, DS1337_REG_CONTROL, &control);
-	if (ret)
-		goto out;
-
-	control &= ~mask;
-	control |= value;
-
-	ret = regmap_write(ds1307->regmap, DS1337_REG_CONTROL, control);
-out:
+	ret = regmap_update_bits(ds1307->regmap, DS1337_REG_CONTROL,
+				 mask, value);
 	mutex_unlock(lock);
 
 	return ret;
···
 static int ds3231_clk_32khz_control(struct ds1307 *ds1307, bool enable)
 {
 	struct mutex *lock = &ds1307->rtc->ops_lock;
-	int status;
 	int ret;
 
 	mutex_lock(lock);
-
-	ret = regmap_read(ds1307->regmap, DS1337_REG_STATUS, &status);
-	if (ret)
-		goto out;
-
-	if (enable)
-		status |= DS3231_BIT_EN32KHZ;
-	else
-		status &= ~DS3231_BIT_EN32KHZ;
-
-	ret = regmap_write(ds1307->regmap, DS1337_REG_STATUS, status);
-out:
+	ret = regmap_update_bits(ds1307->regmap, DS1337_REG_STATUS,
+				 DS3231_BIT_EN32KHZ,
+				 enable ? DS3231_BIT_EN32KHZ : 0);
 	mutex_unlock(lock);
 
 	return ret;
···
 	 * If different then set the wday which we computed using
 	 * timestamp
 	 */
-	if (wday != tm.tm_wday) {
-		regmap_read(ds1307->regmap, MCP794XX_REG_WEEKDAY, &wday);
-		wday = wday & ~MCP794XX_REG_WEEKDAY_WDAY_MASK;
-		wday = wday | (tm.tm_wday + 1);
-		regmap_write(ds1307->regmap, MCP794XX_REG_WEEKDAY, wday);
-	}
+	if (wday != tm.tm_wday)
+		regmap_update_bits(ds1307->regmap, MCP794XX_REG_WEEKDAY,
+				   MCP794XX_REG_WEEKDAY_WDAY_MASK,
+				   tm.tm_wday + 1);
 
 	if (want_irq) {
 		device_set_wakeup_capable(ds1307->dev, true);