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adt7470: observe the number of temperature sensors to shorten update time

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The adt7470 driver currently assumes that 1s is the proper time to wait to
read all temperature sensors.  However, the correct time is 200ms *
number_of_sensors.  This patch sets the default time to provide for 10
sensors and then lowers it based on the number of sensor inputs that have
nozero values.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Darrick J. Wong 2009-01-06 14:41:33 -08:00 committed by Linus Torvalds
parent 2e75a4b7ae
commit 2f22d5dff6
1 changed files with 48 additions and 8 deletions
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56
drivers/hwmon/adt7470.c
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@ -129,8 +129,8 @@ I2C_CLIENT_INSMOD_1(adt7470);
/* How often do we reread sensor limit values? (In jiffies) */
#define LIMIT_REFRESH_INTERVAL (60 * HZ)
/* sleep 1s while gathering temperature data */
#define TEMP_COLLECTION_TIME 1000
/* Wait at least 200ms per sensor for 10 sensors */
#define TEMP_COLLECTION_TIME 2000
/* datasheet says to divide this number by the fan reading to get fan rpm */
#define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x))
@ -147,6 +147,8 @@ struct adt7470_data {
unsigned long sensors_last_updated; /* In jiffies */
unsigned long limits_last_updated; /* In jiffies */
int num_temp_sensors; /* -1 = probe */
s8 temp[ADT7470_TEMP_COUNT];
s8 temp_min[ADT7470_TEMP_COUNT];
s8 temp_max[ADT7470_TEMP_COUNT];
@ -256,12 +258,10 @@ static struct adt7470_data *adt7470_update_device(struct device *dev)
cfg |= 0x80;
i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, cfg);
/*
* Delay is 200ms * number of tmp05 sensors. Too bad
* there's no way to figure out how many are connected.
* For now, assume 1s will work.
*/
msleep(TEMP_COLLECTION_TIME);
/* Delay is 200ms * number of temp sensors. */
msleep((data->num_temp_sensors >= 0 ?
data->num_temp_sensors * 200 :
TEMP_COLLECTION_TIME));
/* done reading temperature sensors */
cfg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG);
@ -276,6 +276,12 @@ static struct adt7470_data *adt7470_update_device(struct device *dev)
data->temp[i] = i2c_smbus_read_byte_data(client,
ADT7470_TEMP_REG(i));
/* Figure out the number of temp sensors */
if (data->num_temp_sensors < 0)
for (i = 0; i < ADT7470_TEMP_COUNT; i++)
if (data->temp[i])
data->num_temp_sensors = i + 1;
for (i = 0; i < ADT7470_FAN_COUNT; i++)
data->fan[i] = adt7470_read_word_data(client,
ADT7470_REG_FAN(i));
@ -359,6 +365,35 @@ out:
return data;
}
static ssize_t show_num_temp_sensors(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct adt7470_data *data = adt7470_update_device(dev);
return sprintf(buf, "%d\n", data->num_temp_sensors);
}
static ssize_t set_num_temp_sensors(struct device *dev,
struct device_attribute *devattr,
const char *buf,
size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct adt7470_data *data = i2c_get_clientdata(client);
long temp;
if (strict_strtol(buf, 10, &temp))
return -EINVAL;
temp = SENSORS_LIMIT(temp, -1, 10);
mutex_lock(&data->lock);
data->num_temp_sensors = temp;
mutex_unlock(&data->lock);
return count;
}
static ssize_t show_temp_min(struct device *dev,
struct device_attribute *devattr,
char *buf)
@ -825,6 +860,8 @@ static ssize_t show_alarm(struct device *dev,
}
static DEVICE_ATTR(alarm_mask, S_IRUGO, show_alarm_mask, NULL);
static DEVICE_ATTR(num_temp_sensors, S_IWUSR | S_IRUGO, show_num_temp_sensors,
set_num_temp_sensors);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
set_temp_max, 0);
@ -997,6 +1034,7 @@ static SENSOR_DEVICE_ATTR(pwm4_auto_channels_temp, S_IWUSR | S_IRUGO,
static struct attribute *adt7470_attr[] =
{
&dev_attr_alarm_mask.attr,
&dev_attr_num_temp_sensors.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp3_max.dev_attr.attr,
@ -1129,6 +1167,8 @@ static int adt7470_probe(struct i2c_client *client,
goto exit;
}
data->num_temp_sensors = -1;
i2c_set_clientdata(client, data);
mutex_init(&data->lock);