[PATCH v1 2/5] hwmon: (lm75) Include hwmon_chip in the permitted types to be writen

[Iker Perez <iker.perez@codethink.co.uk>]

From: Iker Perez del Palomar Sustatxa <iker.perez@codethink.co.uk>

hwmon_chip needs to be allowed to be written because tmp75b's sample time
can be configured. Allowing hwmon_chip to be written will allow to
configure the update_interval from sysfs.

Signed-off-by: Iker Perez del Palomar Sustatxa <iker.perez@codethink.co.uk>
---
 drivers/hwmon/lm75.c | 62 ++++++++++++++++++++++++++++++++--------------------
 1 file changed, 38 insertions(+), 24 deletions(-)

diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 0209e0719784..80a11c33db77 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -128,34 +128,48 @@ static int lm75_write(struct device *dev, enum hwmon_sensor_types type,
 	u8 resolution;
 	int reg;
 
-	if (type != hwmon_temp)
-		return -EINVAL;
-
-	switch (attr) {
-	case hwmon_temp_max:
-		reg = LM75_REG_MAX;
-		break;
-	case hwmon_temp_max_hyst:
-		reg = LM75_REG_HYST;
-		break;
-	default:
-		return -EINVAL;
+	switch (type) {
+	case hwmon_chip:
+		switch (attr) {
+		case hwmon_chip_update_interval:
+			if (data->kind == tmp75b)
+				pr_info("Iker inside write\n");
+			else
+				return -EINVAL;
+			break;
+		default:
+			return -EINVAL;
+		}
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_max:
+			reg = LM75_REG_MAX;
+			break;
+		case hwmon_temp_max_hyst:
+			reg = LM75_REG_HYST;
+			break;
+		default:
+			return -EINVAL;
 	}
 
-	/*
-	 * Resolution of limit registers is assumed to be the same as the
-	 * temperature input register resolution unless given explicitly.
-	 */
-	if (data->resolution_limits)
-		resolution = data->resolution_limits;
-	else
-		resolution = data->resolution;
+		/*
+		* Resolution of limit registers is assumed to be the same as the
+		* temperature input register resolution unless given explicitly.
+		*/
+		if (data->resolution_limits)
+			resolution = data->resolution_limits;
+		else
+			resolution = data->resolution;
 
-	temp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX);
-	temp = DIV_ROUND_CLOSEST(temp  << (resolution - 8),
-				 1000) << (16 - resolution);
+		temp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX);
+		temp = DIV_ROUND_CLOSEST(temp  << (resolution - 8),
+					 1000) << (16 - resolution);
 
-	return regmap_write(data->regmap, reg, temp);
+		return regmap_write(data->regmap, reg, temp);
+	default:
+		return -EINVAL;
+	}
+	return 0;
 }
 
 static umode_t lm75_is_visible(const void *data, enum hwmon_sensor_types type,
-- 
2.11.0