hwmon: (tmp464) Use multi-byte regmap operations

Use multi-byte regmap operations where possible to reduce code size
and the need for mutex protection.

No functional changes.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/tmp464.c

@@ -147,11 +147,11 @@ static int tmp464_temp_read(struct device *dev, u32 attr, int channel, long *val
 {
 	struct tmp464_data *data = dev_get_drvdata(dev);
 	struct regmap *regmap = data->regmap;
-	unsigned int regval, regval2;
+	unsigned int regs[2];
+	unsigned int regval;
+	u16 regvals[2];
 	int err = 0;
 
-	mutex_lock(&data->update_lock);
-
 	switch (attr) {
 	case hwmon_temp_max_alarm:
 		err = regmap_read(regmap, TMP464_THERM_STATUS_REG, &regval);
@@ -172,26 +172,27 @@ static int tmp464_temp_read(struct device *dev, u32 attr, int channel, long *val
 		 * complete. That means we have to cache the value internally
 		 * for one measurement cycle and report the cached value.
 		 */
+		mutex_lock(&data->update_lock);
 		if (!data->valid || time_after(jiffies, data->last_updated +
 					       msecs_to_jiffies(data->update_interval))) {
 			err = regmap_read(regmap, TMP464_REMOTE_OPEN_REG, &regval);
 			if (err < 0)
-				break;
+				goto unlock;
 			data->open_reg = regval;
 			data->last_updated = jiffies;
 			data->valid = true;
 		}
 		*val = !!(data->open_reg & BIT(channel + 7));
+unlock:
+		mutex_unlock(&data->update_lock);
 		break;
 	case hwmon_temp_max_hyst:
-		err = regmap_read(regmap, TMP464_THERM_LIMIT[channel], &regval);
+		regs[0] = TMP464_THERM_LIMIT[channel];
+		regs[1] = TMP464_TEMP_HYST_REG;
+		err = regmap_multi_reg_read(regmap, regs, regvals, 2);
 		if (err < 0)
 			break;
-		err = regmap_read(regmap, TMP464_TEMP_HYST_REG, &regval2);
-		if (err < 0)
-			break;
-		regval -= regval2;
-		*val = temp_from_reg(regval);
+		*val = temp_from_reg(regvals[0] - regvals[1]);
 		break;
 	case hwmon_temp_max:
 		err = regmap_read(regmap, TMP464_THERM_LIMIT[channel], &regval);
@@ -200,14 +201,12 @@ static int tmp464_temp_read(struct device *dev, u32 attr, int channel, long *val
 		*val = temp_from_reg(regval);
 		break;
 	case hwmon_temp_crit_hyst:
-		err = regmap_read(regmap, TMP464_THERM2_LIMIT[channel], &regval);
-		if (err < 0)
-			break;
-		err = regmap_read(regmap, TMP464_TEMP_HYST_REG, &regval2);
+		regs[0] = TMP464_THERM2_LIMIT[channel];
+		regs[1] = TMP464_TEMP_HYST_REG;
+		err = regmap_multi_reg_read(regmap, regs, regvals, 2);
 		if (err < 0)
 			break;
-		regval -= regval2;
-		*val = temp_from_reg(regval);
+		*val = temp_from_reg(regvals[0] - regvals[1]);
 		break;
 	case hwmon_temp_crit:
 		err = regmap_read(regmap, TMP464_THERM2_LIMIT[channel], &regval);
@@ -239,8 +238,6 @@ static int tmp464_temp_read(struct device *dev, u32 attr, int channel, long *val
 		break;
 	}
 
-	mutex_unlock(&data->update_lock);
-
 	return err;
 }