On 12/01/2015 06:21 AM, Nishanth Menon wrote:
[ ... ]
Hint about how the patch will look like:
Looks ok (and better).
Guenter
diff --git a/drivers/hwmon/tmp102.c b/drivers/hwmon/tmp102.c
index 65482624ea2c..5289aa0980a8 100644
--- a/drivers/hwmon/tmp102.c
+++ b/drivers/hwmon/tmp102.c
@@ -58,6 +58,7 @@ struct tmp102 {
u16 config_orig;
unsigned long last_update;
int temp[3];
+ bool first_time;
};
/* convert left adjusted 13-bit TMP102 register value to milliCelsius */
@@ -93,6 +94,7 @@ static struct tmp102 *tmp102_update_device(struct device *dev)
tmp102->temp[i] = tmp102_reg_to_mC(status);
}
tmp102->last_update = jiffies;
+ tmp102->first_time = false;
}
mutex_unlock(&tmp102->lock);
return tmp102;
@@ -102,6 +104,12 @@ static int tmp102_read_temp(void *dev, int *temp)
{
struct tmp102 *tmp102 = tmp102_update_device(dev);
+ /* Is it too early even to return a conversion? */
+ if (tmp102->first_time) {
+ dev_dbg(dev, "%s: Conversion not ready yet..\n", __func__);
+ return -EAGAIN;
+ }
+
*temp = tmp102->temp[0];
return 0;
@@ -114,6 +122,10 @@ static ssize_t tmp102_show_temp(struct device *dev,
struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
struct tmp102 *tmp102 = tmp102_update_device(dev);
+ /* Is it too early even to return a read? */
+ if (tmp102->first_time)
+ return -EAGAIN;
+
return sprintf(buf, "%d\n", tmp102->temp[sda->index]);
}
@@ -207,7 +219,9 @@ static int tmp102_probe(struct i2c_client *client,
status = -ENODEV;
goto fail_restore_config;
}
- tmp102->last_update = jiffies - HZ;
+ tmp102->last_update = jiffies;
+ /* Mark that we are not ready with data until conversion is complete */
+ tmp102->first_time = true;
mutex_init(&tmp102->lock);
hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
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