[linux,dev-6.12,v1 4/9] hwmon: (ina238) Report energy in microjoules

[Peter Yin]

From: Jonas Rebmann <jre at pengutronix.de>

The hwmon sysfs interface specifies that energy values should be
reported in microjoules. This is also what tools such as lmsensors
expect, reporting wrong values otherwise.

Adjust the driver to scale the output accordingly and adjust ina238
driver documentation.

Fixes: 6daaf15a1173 ("hwmon: (ina238) Add support for SQ52206")
Signed-off-by: Jonas Rebmann <jre at pengutronix.de>
Link: https://lore.kernel.org/r/20250715-hwmon-ina238-microjoules-v1-1-9df678568a41@pengutronix.de
Signed-off-by: Guenter Roeck <linux at roeck-us.net>
(cherry picked from commit 3e8e93cbb8b0fe67661665a3e7e80642a02884a5)
---
 Documentation/hwmon/ina238.rst | 2 +-
 drivers/hwmon/ina238.c         | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/Documentation/hwmon/ina238.rst b/Documentation/hwmon/ina238.rst
index d1b93cf8627f..9a24da4786a4 100644
--- a/Documentation/hwmon/ina238.rst
+++ b/Documentation/hwmon/ina238.rst
@@ -65,7 +65,7 @@ Additional sysfs entries for sq52206
 ------------------------------------
 
 ======================= =======================================================
-energy1_input		Energy measurement (mJ)
+energy1_input		Energy measurement (uJ)
 
 power1_input_highest	Peak Power (uW)
 ======================= =======================================================
diff --git a/drivers/hwmon/ina238.c b/drivers/hwmon/ina238.c
index a4a41742786b..9a5fd16a4ec2 100644
--- a/drivers/hwmon/ina238.c
+++ b/drivers/hwmon/ina238.c
@@ -97,7 +97,7 @@
  *  Power (mW) = 0.2 * register value * 20000 / rshunt / 4 * gain
  *  (Specific for SQ52206)
  *  Power (mW) = 0.24 * register value * 20000 / rshunt / 4 * gain
- *  Energy (mJ) = 16 * 0.24 * register value * 20000 / rshunt / 4 * gain
+ *  Energy (uJ) = 16 * 0.24 * register value * 20000 / rshunt / 4 * gain * 1000
  */
 #define INA238_CALIBRATION_VALUE	16384
 #define INA238_FIXED_SHUNT		20000
@@ -500,9 +500,9 @@ static ssize_t energy1_input_show(struct device *dev,
 	if (ret)
 		return ret;
 
-	/* result in mJ */
-	energy = div_u64(regval * INA238_FIXED_SHUNT *	data->gain * 16 *
-				data->config->power_calculate_factor, 4 * 100 * data->rshunt);
+	/* result in uJ */
+	energy = div_u64(regval * INA238_FIXED_SHUNT *	data->gain * 16 * 10 *
+				data->config->power_calculate_factor, 4 * data->rshunt);
 
 	return sysfs_emit(buf, "%llu\n", energy);
 }
-- 
2.43.0