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Date: Fri, 23 Oct 2020 14:23:59 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc: jdelvare@...e.com, Tobi Wulff <tobi.wulff@...iedtelesis.co.nz>,
linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] hwmon: (adt7470) Create functions for updating
readings and limits
On Tue, Oct 20, 2020 at 11:34:22AM +1300, Chris Packham wrote:
> Split the body of adt7470_update_device() into two helper functions
> adt7470_update_sensors() and adt7470_update_limits(). Although neither
> of the new helpers returns an error yet lay the groundwork for
> propagating failures through to the sysfs readers.
>
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
Applied.
Thanks,
Guenter
> ---
> drivers/hwmon/adt7470.c | 154 ++++++++++++++++++++++++++++++----------
> 1 file changed, 118 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/hwmon/adt7470.c b/drivers/hwmon/adt7470.c
> index 740f39a54ab0..2e8feacccf84 100644
> --- a/drivers/hwmon/adt7470.c
> +++ b/drivers/hwmon/adt7470.c
> @@ -270,37 +270,11 @@ static int adt7470_update_thread(void *p)
> return 0;
> }
>
> -static struct adt7470_data *adt7470_update_device(struct device *dev)
> +static int adt7470_update_sensors(struct adt7470_data *data)
> {
> - struct adt7470_data *data = dev_get_drvdata(dev);
> struct i2c_client *client = data->client;
> - unsigned long local_jiffies = jiffies;
> u8 cfg;
> int i;
> - int need_sensors = 1;
> - int need_limits = 1;
> -
> - /*
> - * Figure out if we need to update the shadow registers.
> - * Lockless means that we may occasionally report out of
> - * date data.
> - */
> - if (time_before(local_jiffies, data->sensors_last_updated +
> - SENSOR_REFRESH_INTERVAL) &&
> - data->sensors_valid)
> - need_sensors = 0;
> -
> - if (time_before(local_jiffies, data->limits_last_updated +
> - LIMIT_REFRESH_INTERVAL) &&
> - data->limits_valid)
> - need_limits = 0;
> -
> - if (!need_sensors && !need_limits)
> - return data;
> -
> - mutex_lock(&data->lock);
> - if (!need_sensors)
> - goto no_sensor_update;
>
> if (!data->temperatures_probed)
> adt7470_read_temperatures(client, data);
> @@ -352,12 +326,13 @@ static struct adt7470_data *adt7470_update_device(struct device *dev)
> data->alarms_mask = adt7470_read_word_data(client,
> ADT7470_REG_ALARM1_MASK);
>
> - data->sensors_last_updated = local_jiffies;
> - data->sensors_valid = 1;
> + return 0;
> +}
>
> -no_sensor_update:
> - if (!need_limits)
> - goto out;
> +static int adt7470_update_limits(struct adt7470_data *data)
> +{
> + struct i2c_client *client = data->client;
> + int i;
>
> for (i = 0; i < ADT7470_TEMP_COUNT; i++) {
> data->temp_min[i] = i2c_smbus_read_byte_data(client,
> @@ -382,12 +357,55 @@ static struct adt7470_data *adt7470_update_device(struct device *dev)
> ADT7470_REG_PWM_TMIN(i));
> }
>
> - data->limits_last_updated = local_jiffies;
> - data->limits_valid = 1;
> + return 0;
> +}
>
> +static struct adt7470_data *adt7470_update_device(struct device *dev)
> +{
> + struct adt7470_data *data = dev_get_drvdata(dev);
> + unsigned long local_jiffies = jiffies;
> + int need_sensors = 1;
> + int need_limits = 1;
> + int err;
> +
> + /*
> + * Figure out if we need to update the shadow registers.
> + * Lockless means that we may occasionally report out of
> + * date data.
> + */
> + if (time_before(local_jiffies, data->sensors_last_updated +
> + SENSOR_REFRESH_INTERVAL) &&
> + data->sensors_valid)
> + need_sensors = 0;
> +
> + if (time_before(local_jiffies, data->limits_last_updated +
> + LIMIT_REFRESH_INTERVAL) &&
> + data->limits_valid)
> + need_limits = 0;
> +
> + if (!need_sensors && !need_limits)
> + return data;
> +
> + mutex_lock(&data->lock);
> + if (need_sensors) {
> + err = adt7470_update_sensors(data);
> + if (err < 0)
> + goto out;
> + data->sensors_last_updated = local_jiffies;
> + data->sensors_valid = 1;
> + }
> +
> + if (need_limits) {
> + err = adt7470_update_limits(data);
> + if (err < 0)
> + goto out;
> + data->limits_last_updated = local_jiffies;
> + data->limits_valid = 1;
> + }
> out:
> mutex_unlock(&data->lock);
> - return data;
> +
> + return err < 0 ? ERR_PTR(err) : data;
> }
>
> static ssize_t auto_update_interval_show(struct device *dev,
> @@ -395,6 +413,10 @@ static ssize_t auto_update_interval_show(struct device *dev,
> char *buf)
> {
> struct adt7470_data *data = adt7470_update_device(dev);
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> return sprintf(buf, "%d\n", data->auto_update_interval);
> }
>
> @@ -422,6 +444,10 @@ static ssize_t num_temp_sensors_show(struct device *dev,
> char *buf)
> {
> struct adt7470_data *data = adt7470_update_device(dev);
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> return sprintf(buf, "%d\n", data->num_temp_sensors);
> }
>
> @@ -451,6 +477,10 @@ static ssize_t temp_min_show(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = adt7470_update_device(dev);
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> return sprintf(buf, "%d\n", 1000 * data->temp_min[attr->index]);
> }
>
> @@ -483,6 +513,10 @@ static ssize_t temp_max_show(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = adt7470_update_device(dev);
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> return sprintf(buf, "%d\n", 1000 * data->temp_max[attr->index]);
> }
>
> @@ -515,6 +549,10 @@ static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = adt7470_update_device(dev);
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> return sprintf(buf, "%d\n", 1000 * data->temp[attr->index]);
> }
>
> @@ -524,6 +562,9 @@ static ssize_t alarm_mask_show(struct device *dev,
> {
> struct adt7470_data *data = adt7470_update_device(dev);
>
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> return sprintf(buf, "%x\n", data->alarms_mask);
> }
>
> @@ -554,6 +595,9 @@ static ssize_t fan_max_show(struct device *dev,
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = adt7470_update_device(dev);
>
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> if (FAN_DATA_VALID(data->fan_max[attr->index]))
> return sprintf(buf, "%d\n",
> FAN_PERIOD_TO_RPM(data->fan_max[attr->index]));
> @@ -590,6 +634,9 @@ static ssize_t fan_min_show(struct device *dev,
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = adt7470_update_device(dev);
>
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> if (FAN_DATA_VALID(data->fan_min[attr->index]))
> return sprintf(buf, "%d\n",
> FAN_PERIOD_TO_RPM(data->fan_min[attr->index]));
> @@ -626,6 +673,9 @@ static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = adt7470_update_device(dev);
>
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> if (FAN_DATA_VALID(data->fan[attr->index]))
> return sprintf(buf, "%d\n",
> FAN_PERIOD_TO_RPM(data->fan[attr->index]));
> @@ -637,6 +687,10 @@ static ssize_t force_pwm_max_show(struct device *dev,
> struct device_attribute *devattr, char *buf)
> {
> struct adt7470_data *data = adt7470_update_device(dev);
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> return sprintf(buf, "%d\n", data->force_pwm_max);
> }
>
> @@ -670,6 +724,10 @@ static ssize_t pwm_show(struct device *dev, struct device_attribute *devattr,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = adt7470_update_device(dev);
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> return sprintf(buf, "%d\n", data->pwm[attr->index]);
> }
>
> @@ -763,6 +821,10 @@ static ssize_t pwm_max_show(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = adt7470_update_device(dev);
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> return sprintf(buf, "%d\n", data->pwm_max[attr->index]);
> }
>
> @@ -794,6 +856,10 @@ static ssize_t pwm_min_show(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = adt7470_update_device(dev);
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> return sprintf(buf, "%d\n", data->pwm_min[attr->index]);
> }
>
> @@ -825,6 +891,10 @@ static ssize_t pwm_tmax_show(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = adt7470_update_device(dev);
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> /* the datasheet says that tmax = tmin + 20C */
> return sprintf(buf, "%d\n", 1000 * (20 + data->pwm_tmin[attr->index]));
> }
> @@ -834,6 +904,10 @@ static ssize_t pwm_tmin_show(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = adt7470_update_device(dev);
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> return sprintf(buf, "%d\n", 1000 * data->pwm_tmin[attr->index]);
> }
>
> @@ -866,6 +940,10 @@ static ssize_t pwm_auto_show(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = adt7470_update_device(dev);
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
> +
> return sprintf(buf, "%d\n", 1 + data->pwm_automatic[attr->index]);
> }
>
> @@ -911,8 +989,12 @@ static ssize_t pwm_auto_temp_show(struct device *dev,
> {
> struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> struct adt7470_data *data = adt7470_update_device(dev);
> - u8 ctrl = data->pwm_auto_temp[attr->index];
> + u8 ctrl;
> +
> + if (IS_ERR(data))
> + return PTR_ERR(data);
>
> + ctrl = data->pwm_auto_temp[attr->index];
> if (ctrl)
> return sprintf(buf, "%d\n", 1 << (ctrl - 1));
> else
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