hwmon: (nct6775) Fix temperature alarm attributes
Driver displays wrong alarms for temperature attributes.
Turns out that temperature alarm bits are not fixed, but determined
by temperature source mapping. To fix the problem, walk through
the temperature sources to determine the correct alarm bit associated
with a given attribute.
Cc: stable@vger.kernel.org # 3.10+
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c
index 04638ae..2405ab4 100644
--- a/drivers/hwmon/nct6775.c
+++ b/drivers/hwmon/nct6775.c
@@ -625,6 +625,7 @@
u8 has_fan_min; /* some fans don't have min register */
bool has_fan_div;
+ u8 num_temp_alarms; /* 2 or 3 */
u8 temp_fixed_num; /* 3 or 6 */
u8 temp_type[NUM_TEMP_FIXED];
s8 temp_offset[NUM_TEMP_FIXED];
@@ -1193,6 +1194,42 @@
(unsigned int)((data->alarms >> nr) & 0x01));
}
+static int find_temp_source(struct nct6775_data *data, int index, int count)
+{
+ int source = data->temp_src[index];
+ int nr;
+
+ for (nr = 0; nr < count; nr++) {
+ int src;
+
+ src = nct6775_read_value(data,
+ data->REG_TEMP_SOURCE[nr]) & 0x1f;
+ if (src == source)
+ return nr;
+ }
+ return -1;
+}
+
+static ssize_t
+show_temp_alarm(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
+ struct nct6775_data *data = nct6775_update_device(dev);
+ unsigned int alarm = 0;
+ int nr;
+
+ /*
+ * For temperatures, there is no fixed mapping from registers to alarm
+ * bits. Alarm bits are determined by the temperature source mapping.
+ */
+ nr = find_temp_source(data, sattr->index, data->num_temp_alarms);
+ if (nr >= 0) {
+ int bit = data->ALARM_BITS[nr + TEMP_ALARM_BASE];
+ alarm = (data->alarms >> bit) & 0x01;
+ }
+ return sprintf(buf, "%u\n", alarm);
+}
+
static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO, show_in_reg, NULL, 0, 0);
static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_in_reg, NULL, 1, 0);
static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_in_reg, NULL, 2, 0);
@@ -1874,22 +1911,18 @@
};
static struct sensor_device_attribute sda_temp_alarm[] = {
- SENSOR_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL,
- TEMP_ALARM_BASE),
- SENSOR_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL,
- TEMP_ALARM_BASE + 1),
- SENSOR_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL,
- TEMP_ALARM_BASE + 2),
- SENSOR_ATTR(temp4_alarm, S_IRUGO, show_alarm, NULL,
- TEMP_ALARM_BASE + 3),
- SENSOR_ATTR(temp5_alarm, S_IRUGO, show_alarm, NULL,
- TEMP_ALARM_BASE + 4),
- SENSOR_ATTR(temp6_alarm, S_IRUGO, show_alarm, NULL,
- TEMP_ALARM_BASE + 5),
+ SENSOR_ATTR(temp1_alarm, S_IRUGO, show_temp_alarm, NULL, 0),
+ SENSOR_ATTR(temp2_alarm, S_IRUGO, show_temp_alarm, NULL, 1),
+ SENSOR_ATTR(temp3_alarm, S_IRUGO, show_temp_alarm, NULL, 2),
+ SENSOR_ATTR(temp4_alarm, S_IRUGO, show_temp_alarm, NULL, 3),
+ SENSOR_ATTR(temp5_alarm, S_IRUGO, show_temp_alarm, NULL, 4),
+ SENSOR_ATTR(temp6_alarm, S_IRUGO, show_temp_alarm, NULL, 5),
+ SENSOR_ATTR(temp7_alarm, S_IRUGO, show_temp_alarm, NULL, 6),
+ SENSOR_ATTR(temp8_alarm, S_IRUGO, show_temp_alarm, NULL, 7),
+ SENSOR_ATTR(temp9_alarm, S_IRUGO, show_temp_alarm, NULL, 8),
+ SENSOR_ATTR(temp10_alarm, S_IRUGO, show_temp_alarm, NULL, 9),
};
-#define NUM_TEMP_ALARM ARRAY_SIZE(sda_temp_alarm)
-
static ssize_t
show_pwm_mode(struct device *dev, struct device_attribute *attr, char *buf)
{
@@ -3215,13 +3248,11 @@
device_remove_file(dev, &sda_temp_max[i].dev_attr);
device_remove_file(dev, &sda_temp_max_hyst[i].dev_attr);
device_remove_file(dev, &sda_temp_crit[i].dev_attr);
+ device_remove_file(dev, &sda_temp_alarm[i].dev_attr);
if (!(data->have_temp_fixed & (1 << i)))
continue;
device_remove_file(dev, &sda_temp_type[i].dev_attr);
device_remove_file(dev, &sda_temp_offset[i].dev_attr);
- if (i >= NUM_TEMP_ALARM)
- continue;
- device_remove_file(dev, &sda_temp_alarm[i].dev_attr);
}
device_remove_file(dev, &sda_caseopen[0].dev_attr);
@@ -3419,6 +3450,7 @@
data->auto_pwm_num = 6;
data->has_fan_div = true;
data->temp_fixed_num = 3;
+ data->num_temp_alarms = 3;
data->ALARM_BITS = NCT6775_ALARM_BITS;
@@ -3483,6 +3515,7 @@
data->auto_pwm_num = 4;
data->has_fan_div = false;
data->temp_fixed_num = 3;
+ data->num_temp_alarms = 3;
data->ALARM_BITS = NCT6776_ALARM_BITS;
@@ -3547,6 +3580,7 @@
data->auto_pwm_num = 4;
data->has_fan_div = false;
data->temp_fixed_num = 6;
+ data->num_temp_alarms = 2;
data->ALARM_BITS = NCT6779_ALARM_BITS;
@@ -3897,6 +3931,12 @@
if (err)
goto exit_remove;
}
+ if (find_temp_source(data, i, data->num_temp_alarms) >= 0) {
+ err = device_create_file(dev,
+ &sda_temp_alarm[i].dev_attr);
+ if (err)
+ goto exit_remove;
+ }
if (!(data->have_temp_fixed & (1 << i)))
continue;
err = device_create_file(dev, &sda_temp_type[i].dev_attr);
@@ -3905,12 +3945,6 @@
err = device_create_file(dev, &sda_temp_offset[i].dev_attr);
if (err)
goto exit_remove;
- if (i >= NUM_TEMP_ALARM ||
- data->ALARM_BITS[TEMP_ALARM_BASE + i] < 0)
- continue;
- err = device_create_file(dev, &sda_temp_alarm[i].dev_attr);
- if (err)
- goto exit_remove;
}
for (i = 0; i < ARRAY_SIZE(sda_caseopen); i++) {