hwmon: (emc1403) Make all hyst attributes except for temp1_crit_hyst read-only

All chips in this chip series only support a single hysteresis value. Having
multiple writable hysteresis attributes is therefore confusing, since a single
write affects all hysteresis temperatures. Make all but one (temp1_crit_hyst)
read-only.

Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/Documentation/hwmon/emc1403 b/Documentation/hwmon/emc1403
index b109e35e23859203bf11e5f58c04cb4ccf1d366d..a869b0ef6a9d6103b9b98fd6f557fbfbf2cfba9a 100644 (file)
--- a/Documentation/hwmon/emc1403
+++ b/Documentation/hwmon/emc1403
@@ -51,6 +51,9 @@ This implementation detail implies the following:
   was 80 degrees C, and the hysteresis was 75 degrees C, and you change
   the critical limit to 90 degrees C, then the hysteresis will
   automatically change to 85 degrees C.
-* While hysteresis limits can be set for all critical limits, setting a single
-  hysteresis value affects the hysteresis values for all limits on all sensors.
+* The hysteresis values can't be set independently. We decided to make
+  only temp1_crit_hyst writable, while all other hysteresis attributes
+  are read-only. Setting temp1_crit_hyst writes the difference between
+  temp1_crit_hyst and temp1_crit into the chip, and the same relative
+  hysteresis applies automatically to all other limits.
 * The limits should be set before the hysteresis.

diff --git a/drivers/hwmon/emc1403.c b/drivers/hwmon/emc1403.c
index f76e5503b89a81bd56ab835fa0db3013a7c314eb..46220b131153339f8b3e95b495041f797db32169 100644 (file)
--- a/drivers/hwmon/emc1403.c
+++ b/drivers/hwmon/emc1403.c
@@ -195,8 +195,7 @@ static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO,
        show_bit, NULL, 0x35, 0x02);
 static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO,
        show_bit, NULL, 0x37, 0x02);
-static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO | S_IWUSR,
-       show_hyst, store_hyst, 0x19);
+static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_hyst, NULL, 0x19);
 
 static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR,
        show_temp, store_temp, 0x16);
@@ -212,8 +211,7 @@ static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO,
        show_bit, NULL, 0x35, 0x04);
 static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO,
        show_bit, NULL, 0x37, 0x04);
-static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO | S_IWUSR,
-       show_hyst, store_hyst, 0x1A);
+static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_hyst, NULL, 0x1A);
 
 static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO | S_IWUSR,
        show_temp, store_temp, 0x2D);
@@ -229,8 +227,7 @@ static SENSOR_DEVICE_ATTR_2(temp4_max_alarm, S_IRUGO,
        show_bit, NULL, 0x35, 0x08);
 static SENSOR_DEVICE_ATTR_2(temp4_crit_alarm, S_IRUGO,
        show_bit, NULL, 0x37, 0x08);
-static SENSOR_DEVICE_ATTR(temp4_crit_hyst, S_IRUGO | S_IWUSR,
-       show_hyst, store_hyst, 0x30);
+static SENSOR_DEVICE_ATTR(temp4_crit_hyst, S_IRUGO, show_hyst, NULL, 0x30);
 
 static SENSOR_DEVICE_ATTR_2(power_state, S_IRUGO | S_IWUSR,
        show_bit, store_bit, 0x03, 0x40);