linux-kernel - [RFC PATCH 3/3] hwmon: (tmp401) Use multi-byte regmap operations

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Message-Id: <20240710015622.1960522-4-linux@roeck-us.net>
Date: Tue,  9 Jul 2024 18:56:22 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Mark Brown <broonie@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Jean Delvare <jdelvare@...e.com>,
	linux-hwmon@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Guenter Roeck <linux@...ck-us.net>
Subject: [RFC PATCH 3/3] hwmon: (tmp401) Use multi-byte regmap operations

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

No functional change.

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/hwmon/tmp401.c | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/drivers/hwmon/tmp401.c b/drivers/hwmon/tmp401.c
index df1b45a62e80..8a1497cca2d2 100644
--- a/drivers/hwmon/tmp401.c
+++ b/drivers/hwmon/tmp401.c
@@ -308,7 +308,9 @@ static int tmp401_temp_read(struct device *dev, u32 attr, int channel, long *val
 {
 	struct tmp401_data *data = dev_get_drvdata(dev);
 	struct regmap *regmap = data->regmap;
+	unsigned int regs[2];
 	unsigned int regval;
+	u16 regvals[2];
 	int reg, ret;
 
 	switch (attr) {
@@ -325,20 +327,13 @@ static int tmp401_temp_read(struct device *dev, u32 attr, int channel, long *val
 		*val = tmp401_register_to_temp(regval, data->extended_range);
 		break;
 	case hwmon_temp_crit_hyst:
-		mutex_lock(&data->update_lock);
-		reg = TMP401_TEMP_MSB[3][channel];
-		ret = regmap_read(regmap, reg, &regval);
-		if (ret < 0)
-			goto unlock;
-		*val = tmp401_register_to_temp(regval, data->extended_range);
-		ret = regmap_read(regmap, TMP401_TEMP_CRIT_HYST, &regval);
-		if (ret < 0)
-			goto unlock;
-		*val -= regval * 1000;
-unlock:
-		mutex_unlock(&data->update_lock);
+		regs[0] = TMP401_TEMP_MSB[3][channel];
+		regs[1] = TMP401_TEMP_CRIT_HYST;
+		ret = regmap_multi_reg_read(regmap, regs, regvals, 2);
 		if (ret < 0)
 			return ret;
+		*val = tmp401_register_to_temp(regvals[0], data->extended_range) -
+							(regvals[1] * 1000);
 		break;
 	case hwmon_temp_fault:
 	case hwmon_temp_min_alarm:
-- 
2.39.2