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hwmon: (adt7475) Change show functions to return error data correctly 

Change update device function to return an error pointer if needed,
and report the error to user space.

Signed-off-by: Tokunori Ikegami <ikegami@allied-telesis.co.jp>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Chris Packham <chris.packham@alliedtelesis.co.nz>
[groeck: Clarified/updated description]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Tokunori Ikegami 2018-08-08 10:32:19 +09:00 committed by Guenter Roeck
parent 702afead45
commit 4afec79f65
1 changed files with 38 additions and 2 deletions
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40
drivers/hwmon/adt7475.c
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@ -325,6 +325,9 @@ static ssize_t show_voltage(struct device *dev, struct device_attribute *attr,
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
unsigned short val;
if (IS_ERR(data))
return PTR_ERR(data);
switch (sattr->nr) {
case ALARM:
return sprintf(buf, "%d\n",
@ -380,6 +383,9 @@ static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
int out;
if (IS_ERR(data))
return PTR_ERR(data);
switch (sattr->nr) {
case HYSTERSIS:
mutex_lock(&data->lock);
@ -624,6 +630,9 @@ static ssize_t show_point2(struct device *dev, struct device_attribute *attr,
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
int out, val;
if (IS_ERR(data))
return PTR_ERR(data);
mutex_lock(&data->lock);
out = (data->range[sattr->index] >> 4) & 0x0F;
val = reg2temp(data, data->temp[AUTOMIN][sattr->index]);
@ -682,6 +691,9 @@ static ssize_t show_tach(struct device *dev, struct device_attribute *attr,
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
int out;
if (IS_ERR(data))
return PTR_ERR(data);
if (sattr->nr == ALARM)
out = (data->alarms >> (sattr->index + 10)) & 1;
else
@ -719,6 +731,9 @@ static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
struct adt7475_data *data = adt7475_update_device(dev);
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%d\n", data->pwm[sattr->nr][sattr->index]);
}
@ -728,6 +743,9 @@ static ssize_t show_pwmchan(struct device *dev, struct device_attribute *attr,
struct adt7475_data *data = adt7475_update_device(dev);
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%d\n", data->pwmchan[sattr->index]);
}
@ -737,6 +755,9 @@ static ssize_t show_pwmctrl(struct device *dev, struct device_attribute *attr,
struct adt7475_data *data = adt7475_update_device(dev);
struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%d\n", data->pwmctl[sattr->index]);
}
@ -944,6 +965,9 @@ static ssize_t show_pwmfreq(struct device *dev, struct device_attribute *attr,
int i = clamp_val(data->range[sattr->index] & 0xf, 0,
ARRAY_SIZE(pwmfreq_table) - 1);
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%d\n", pwmfreq_table[i]);
}
@ -1034,6 +1058,10 @@ static ssize_t cpu0_vid_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct adt7475_data *data = adt7475_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
}
@ -1677,7 +1705,9 @@ static int adt7475_probe(struct i2c_client *client,
(data->bypass_attn & (1 << 4)) ? " in4" : "");
/* Limits and settings, should never change update more than once */
adt7475_update_limits(client);
ret = adt7475_update_limits(client);
if (ret)
goto eremove;
return 0;
@ -1876,13 +1906,19 @@ static struct adt7475_data *adt7475_update_device(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct adt7475_data *data = i2c_get_clientdata(client);
int ret;
mutex_lock(&data->lock);
/* Measurement values update every 2 seconds */
if (time_after(jiffies, data->measure_updated + HZ * 2) ||
!data->valid) {
adt7475_update_measure(dev);
ret = adt7475_update_measure(dev);
if (ret) {
data->valid = false;
mutex_unlock(&data->lock);
return ERR_PTR(ret);
}
data->measure_updated = jiffies;
data->valid = true;
}