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Date: Thu, 22 Jun 2023 10:19:00 +0800
From: JuenKit Yip <JuenKit_Yip@...mail.com>
To: Guenter Roeck <linux@...ck-us.net>
Cc: jdelvare@...e.com, linux-hwmon@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/2] hwmon: (sht3x) convert some of sysfs interface to
hwmon
在 2023/6/21 23:33, Guenter Roeck 写道:
> On Wed, Jun 21, 2023 at 11:59:36AM +0800, JuenKit Yip wrote:
>> update_interval, temperature/humidity max/min and hyst
>> were moved to new hwmon interface, and only heater and
>> repeatability were reserved as non-stardard sysfs interface.
>>
>> Signed-off-by: JuenKit Yip <JuenKit_Yip@...mail.com>
>> ---
>> drivers/hwmon/sht3x.c | 351 ++++++++++++++++++++++++++++--------------
>> 1 file changed, 239 insertions(+), 112 deletions(-)
>>
>> diff --git a/drivers/hwmon/sht3x.c b/drivers/hwmon/sht3x.c
>> index bf1863061..31013b5b6 100644
>> --- a/drivers/hwmon/sht3x.c
>> +++ b/drivers/hwmon/sht3x.c
>> @@ -147,6 +147,37 @@ static const u16 mode_to_update_interval[] = {
>> 100,
>> };
>>
>> +static const struct hwmon_channel_info * const sht3x_channel_info[] = {
>> + HWMON_CHANNEL_INFO(chip, HWMON_C_UPDATE_INTERVAL),
>> + HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MIN |
>> + HWMON_T_MIN_HYST | HWMON_T_MAX |
>> + HWMON_T_MAX_HYST | HWMON_T_ALARM),
>> + HWMON_CHANNEL_INFO(humidity, HWMON_H_INPUT | HWMON_H_MIN |
>> + HWMON_H_MIN_HYST | HWMON_H_MAX |
>> + HWMON_H_MAX_HYST | HWMON_H_ALARM),
>> + NULL,
>> +};
>> +
>> +static const struct i2c_device_id sht3x_ids[];
>> +
>> +static umode_t sht3x_is_visible(const void *data, enum hwmon_sensor_types type,
>> + u32 attr, int channel);
>> +static int sht3x_read(struct device *dev, enum hwmon_sensor_types type,
>> + u32 attr, int channel, long *val);
>> +static int sht3x_write(struct device *dev, enum hwmon_sensor_types type,
>> + u32 attr, int channel, long val);
>> +
> No forward declarations, please.
>
>> +static const struct hwmon_ops sht3x_ops = {
>> + .is_visible = sht3x_is_visible,
>> + .read = sht3x_read,
>> + .write = sht3x_write,
>> +};
>> +
>> +static const struct hwmon_chip_info sht3x_chip_info = {
>> + .ops = &sht3x_ops,
>> + .info = sht3x_channel_info,
>> +};
>> +
>> struct sht3x_data {
>> struct i2c_client *client;
>> struct mutex i2c_lock; /* lock for sending i2c commands */
>> @@ -277,26 +308,24 @@ static struct sht3x_data *sht3x_update_client(struct device *dev)
>> }
>>
>> /* sysfs attributes */
> Those are no longer sysfs attributes.
>
>> -static ssize_t temp1_input_show(struct device *dev,
>> - struct device_attribute *attr, char *buf)
>> +static int temp1_input_show(struct device *dev)
> Drop _show from functions which no longer show anything.
>
>> {
>> struct sht3x_data *data = sht3x_update_client(dev);
>>
>> if (IS_ERR(data))
>> return PTR_ERR(data);
>>
>> - return sprintf(buf, "%d\n", data->temperature);
>> + return data->temperature;
>> }
>>
>> -static ssize_t humidity1_input_show(struct device *dev,
>> - struct device_attribute *attr, char *buf)
>> +static int humidity1_input_show(struct device *dev)
>> {
>> struct sht3x_data *data = sht3x_update_client(dev);
>>
>> if (IS_ERR(data))
>> return PTR_ERR(data);
>>
>> - return sprintf(buf, "%u\n", data->humidity);
>> + return data->humidity;
>> }
>>
>> /*
>> @@ -332,33 +361,24 @@ static int limits_update(struct sht3x_data *data)
>> return ret;
>> }
>>
>> -static ssize_t temp1_limit_show(struct device *dev,
>> - struct device_attribute *attr,
>> - char *buf)
>> +static int temp1_limit_show(struct device *dev, int index)
>> {
>> struct sht3x_data *data = dev_get_drvdata(dev);
>> - u8 index = to_sensor_dev_attr(attr)->index;
>> - int temperature_limit = data->temperature_limits[index];
>>
>> - return sysfs_emit(buf, "%d\n", temperature_limit);
>> + return data->temperature_limits[index];
>> }
>>
>> -static ssize_t humidity1_limit_show(struct device *dev,
>> - struct device_attribute *attr,
>> - char *buf)
>> +static ssize_t humidity1_limit_show(struct device *dev, int index)
> Return value is int.
>
>> {
>> struct sht3x_data *data = dev_get_drvdata(dev);
>> - u8 index = to_sensor_dev_attr(attr)->index;
>> - u32 humidity_limit = data->humidity_limits[index];
>>
>> - return sysfs_emit(buf, "%u\n", humidity_limit);
>> + return data->humidity_limits[index];
>> }
>>
>> /*
>> * limit_store must only be called with data_lock held
>> */
>> static size_t limit_store(struct device *dev,
> Drop _store from functions which are no longer sysfs store functions.
> Also, again, return values are int. Note that "size_t" is wrong
> in the current code; it should have been ssize_t since it can
> return a negative value.
I will review them again. Thanks
>
>> - size_t count,
>> u8 index,
>> int temperature,
>> u32 humidity)
>> @@ -400,50 +420,42 @@ static size_t limit_store(struct device *dev,
>>
>> data->temperature_limits[index] = temperature;
>> data->humidity_limits[index] = humidity;
>> - return count;
>> + return 0;
>> }
>>
>> -static ssize_t temp1_limit_store(struct device *dev,
>> - struct device_attribute *attr,
>> - const char *buf,
>> - size_t count)
>> +static int temp1_limit_store(struct device *dev, int index, const char *val)
>> {
>> int temperature;
>> int ret;
>> struct sht3x_data *data = dev_get_drvdata(dev);
>> - u8 index = to_sensor_dev_attr(attr)->index;
>>
>> - ret = kstrtoint(buf, 0, &temperature);
>> + ret = kstrtoint(val, 0, &temperature);
>> if (ret)
>> return ret;
>>
>> temperature = clamp_val(temperature, SHT3X_MIN_TEMPERATURE,
>> SHT3X_MAX_TEMPERATURE);
>> mutex_lock(&data->data_lock);
>> - ret = limit_store(dev, count, index, temperature,
>> + ret = limit_store(dev, index, temperature,
>> data->humidity_limits[index]);
>> mutex_unlock(&data->data_lock);
>>
>> - return ret;
>> + return 0;
> Ignore errors from limit_store() ? why ?
>
>> }
>>
>> -static ssize_t humidity1_limit_store(struct device *dev,
>> - struct device_attribute *attr,
>> - const char *buf,
>> - size_t count)
>> +static ssize_t humidity1_limit_store(struct device *dev, int index, const char *val)
>> {
>> u32 humidity;
>> int ret;
>> struct sht3x_data *data = dev_get_drvdata(dev);
>> - u8 index = to_sensor_dev_attr(attr)->index;
>>
>> - ret = kstrtou32(buf, 0, &humidity);
>> + ret = kstrtou32(val, 0, &humidity);
>> if (ret)
>> return ret;
>>
>> humidity = clamp_val(humidity, SHT3X_MIN_HUMIDITY, SHT3X_MAX_HUMIDITY);
>> mutex_lock(&data->data_lock);
>> - ret = limit_store(dev, count, index, data->temperature_limits[index],
>> + ret = limit_store(dev, index, data->temperature_limits[index],
>> humidity);
>> mutex_unlock(&data->data_lock);
>>
>> @@ -474,7 +486,6 @@ static void sht3x_select_command(struct sht3x_data *data)
>> }
>>
>> static int status_register_read(struct device *dev,
>> - struct device_attribute *attr,
>> char *buffer, int length)
>> {
>> int ret;
>> @@ -487,34 +498,30 @@ static int status_register_read(struct device *dev,
>> return ret;
>> }
>>
>> -static ssize_t temp1_alarm_show(struct device *dev,
>> - struct device_attribute *attr,
>> - char *buf)
>> +static int temp1_alarm_show(struct device *dev)
>> {
>> char buffer[SHT3X_WORD_LEN + SHT3X_CRC8_LEN];
>> int ret;
>>
>> - ret = status_register_read(dev, attr, buffer,
>> + ret = status_register_read(dev, buffer,
>> SHT3X_WORD_LEN + SHT3X_CRC8_LEN);
>> if (ret)
>> return ret;
>>
>> - return sysfs_emit(buf, "%d\n", !!(buffer[0] & 0x04));
>> + return !!(buffer[0] & 0x04);
>> }
>>
>> -static ssize_t humidity1_alarm_show(struct device *dev,
>> - struct device_attribute *attr,
>> - char *buf)
>> +static int humidity1_alarm_show(struct device *dev)
>> {
>> char buffer[SHT3X_WORD_LEN + SHT3X_CRC8_LEN];
>> int ret;
>>
>> - ret = status_register_read(dev, attr, buffer,
>> + ret = status_register_read(dev, buffer,
>> SHT3X_WORD_LEN + SHT3X_CRC8_LEN);
>> if (ret)
>> return ret;
>>
>> - return sysfs_emit(buf, "%d\n", !!(buffer[0] & 0x08));
>> + return !!(buffer[0] & 0x08);
>> }
>>
>> static ssize_t heater_enable_show(struct device *dev,
>> @@ -524,7 +531,7 @@ static ssize_t heater_enable_show(struct device *dev,
>> char buffer[SHT3X_WORD_LEN + SHT3X_CRC8_LEN];
>> int ret;
>>
>> - ret = status_register_read(dev, attr, buffer,
>> + ret = status_register_read(dev, buffer,
>> SHT3X_WORD_LEN + SHT3X_CRC8_LEN);
>> if (ret)
>> return ret;
>> @@ -560,20 +567,14 @@ static ssize_t heater_enable_store(struct device *dev,
>> return ret;
>> }
>>
>> -static ssize_t update_interval_show(struct device *dev,
>> - struct device_attribute *attr,
>> - char *buf)
>> +static int update_interval_show(struct device *dev)
>> {
>> struct sht3x_data *data = dev_get_drvdata(dev);
>>
>> - return sysfs_emit(buf, "%u\n",
>> - mode_to_update_interval[data->mode]);
>> + return mode_to_update_interval[data->mode];
>> }
>>
>> -static ssize_t update_interval_store(struct device *dev,
>> - struct device_attribute *attr,
>> - const char *buf,
>> - size_t count)
>> +static int update_interval_store(struct device *dev, const char *val)
>> {
>> u16 update_interval;
>> u8 mode;
>> @@ -582,7 +583,7 @@ static ssize_t update_interval_store(struct device *dev,
>> struct sht3x_data *data = dev_get_drvdata(dev);
>> struct i2c_client *client = data->client;
>>
>> - ret = kstrtou16(buf, 0, &update_interval);
>> + ret = kstrtou16(val, 0, &update_interval);
>> if (ret)
>> return ret;
>>
>> @@ -592,7 +593,7 @@ static ssize_t update_interval_store(struct device *dev,
>> /* mode did not change */
>> if (mode == data->mode) {
>> mutex_unlock(&data->data_lock);
>> - return count;
>> + return 0;
>> }
>>
>> mutex_lock(&data->i2c_lock);
>> @@ -634,7 +635,7 @@ static ssize_t update_interval_store(struct device *dev,
>> if (ret != SHT3X_CMD_LENGTH)
>> return ret < 0 ? ret : -EIO;
>>
>> - return count;
>> + return 0;
>> }
>>
>> static ssize_t repeatability_show(struct device *dev,
>> @@ -668,60 +669,191 @@ static ssize_t repeatability_store(struct device *dev,
>> return count;
>> }
>>
>> -static SENSOR_DEVICE_ATTR_RO(temp1_input, temp1_input, 0);
>> -static SENSOR_DEVICE_ATTR_RO(humidity1_input, humidity1_input, 0);
>> -static SENSOR_DEVICE_ATTR_RW(temp1_max, temp1_limit, limit_max);
>> -static SENSOR_DEVICE_ATTR_RW(humidity1_max, humidity1_limit, limit_max);
>> -static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, temp1_limit, limit_max_hyst);
>> -static SENSOR_DEVICE_ATTR_RW(humidity1_max_hyst, humidity1_limit,
>> - limit_max_hyst);
>> -static SENSOR_DEVICE_ATTR_RW(temp1_min, temp1_limit, limit_min);
>> -static SENSOR_DEVICE_ATTR_RW(humidity1_min, humidity1_limit, limit_min);
>> -static SENSOR_DEVICE_ATTR_RW(temp1_min_hyst, temp1_limit, limit_min_hyst);
>> -static SENSOR_DEVICE_ATTR_RW(humidity1_min_hyst, humidity1_limit,
>> - limit_min_hyst);
>> -static SENSOR_DEVICE_ATTR_RO(temp1_alarm, temp1_alarm, 0);
>> -static SENSOR_DEVICE_ATTR_RO(humidity1_alarm, humidity1_alarm, 0);
>> static SENSOR_DEVICE_ATTR_RW(heater_enable, heater_enable, 0);
>> -static SENSOR_DEVICE_ATTR_RW(update_interval, update_interval, 0);
>> static SENSOR_DEVICE_ATTR_RW(repeatability, repeatability, 0);
>>
>> static struct attribute *sht3x_attrs[] = {
>> - &sensor_dev_attr_temp1_input.dev_attr.attr,
>> - &sensor_dev_attr_humidity1_input.dev_attr.attr,
>> - &sensor_dev_attr_temp1_max.dev_attr.attr,
>> - &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
>> - &sensor_dev_attr_humidity1_max.dev_attr.attr,
>> - &sensor_dev_attr_humidity1_max_hyst.dev_attr.attr,
>> - &sensor_dev_attr_temp1_min.dev_attr.attr,
>> - &sensor_dev_attr_temp1_min_hyst.dev_attr.attr,
>> - &sensor_dev_attr_humidity1_min.dev_attr.attr,
>> - &sensor_dev_attr_humidity1_min_hyst.dev_attr.attr,
>> - &sensor_dev_attr_temp1_alarm.dev_attr.attr,
>> - &sensor_dev_attr_humidity1_alarm.dev_attr.attr,
>> &sensor_dev_attr_heater_enable.dev_attr.attr,
>> - &sensor_dev_attr_update_interval.dev_attr.attr,
>> - &sensor_dev_attr_repeatability.dev_attr.attr,
>> - NULL
>> -};
>> -
>> -static struct attribute *sts3x_attrs[] = {
>> - &sensor_dev_attr_temp1_input.dev_attr.attr,
>> - &sensor_dev_attr_temp1_max.dev_attr.attr,
>> - &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
>> - &sensor_dev_attr_temp1_min.dev_attr.attr,
>> - &sensor_dev_attr_temp1_min_hyst.dev_attr.attr,
>> - &sensor_dev_attr_temp1_alarm.dev_attr.attr,
>> - &sensor_dev_attr_heater_enable.dev_attr.attr,
>> - &sensor_dev_attr_update_interval.dev_attr.attr,
>> &sensor_dev_attr_repeatability.dev_attr.attr,
>> NULL
>> };
>>
>> ATTRIBUTE_GROUPS(sht3x);
>> -ATTRIBUTE_GROUPS(sts3x);
>>
>> -static const struct i2c_device_id sht3x_ids[];
>> +static umode_t sht3x_is_visible(const void *data, enum hwmon_sensor_types type,
>> + u32 attr, int channel)
>> +{
>> + const struct sht3x_data *chip_data = data;
>> + struct i2c_client *client = chip_data->client;
>> +
>> + switch (type) {
>> + case hwmon_chip:
>> + switch (attr) {
>> + case hwmon_chip_update_interval:
>> + return 0644;
>> + default:
>> + return -EINVAL;
> return 0;
>
>> + }
>> + case hwmon_temp:
>> + switch (attr) {
>> + case hwmon_temp_input:
>> + case hwmon_temp_alarm:
>> + return 0444;
>> + case hwmon_temp_max:
>> + case hwmon_temp_max_hyst:
>> + case hwmon_temp_min:
>> + case hwmon_temp_min_hyst:
>> + return 0644;
>> + default:
>> + return -EINVAL;
> return 0;
>
>> + }
>> + case hwmon_humidity:
>> + if (i2c_match_id(sht3x_ids, client)->driver_data == sts3x)
>> + return 0;
>> + switch (attr) {
>> + case hwmon_humidity_input:
>> + case hwmon_humidity_alarm:
>> + return 0444;
>> + case hwmon_humidity_max:
>> + case hwmon_humidity_max_hyst:
>> + case hwmon_humidity_min:
>> + case hwmon_humidity_min_hyst:
>> + return 0644;
>> + default:
>> + return -EINVAL;
> return 0;
>
>> + }
>> + default:
>> + return -EINVAL;
> returen 0;
>> + }
>> +
>> + return -EINVAL;
> return 0;
>
> Never gets here. FWIW, you might use break; above
> instead of all those return 0; statements.
>
>> +}
>> +
>> +static int sht3x_read(struct device *dev, enum hwmon_sensor_types type,
>> + u32 attr, int channel, long *val)
>> +{
>> + enum sht3x_limits index;
>> +
>> + switch (type) {
>> + case hwmon_chip:
>> + switch (attr) {
>> + case hwmon_chip_update_interval:
>> + *val = update_interval_show(dev);
>> + break;
>> + default:
>> + return -EINVAL;
> -EOPNOTSUPP
>> + }
>> + break;
>> + case hwmon_temp:
>> + switch (attr) {
>> + case hwmon_temp_input:
>> + *val = temp1_input_show(dev);
>> + return 0;
>> + case hwmon_temp_alarm:
>> + *val = temp1_alarm_show(dev);
>> + return 0;
>> + case hwmon_temp_max:
>> + index = limit_max;
>> + break;
>> + case hwmon_temp_max_hyst:
>> + index = limit_max_hyst;
>> + break;
>> + case hwmon_temp_min:
>> + index = limit_min;
>> + break;
>> + case hwmon_temp_min_hyst:
>> + index = limit_min_hyst;
>> + break;
>> + default:
>> + return -EINVAL;
> -EOPNOTSUPP
>> + }
>> + *val = temp1_limit_show(dev, index);
>> + return 0;
> Please be consistent. Either always return 0 in case statements or use break,
> but do not mix the two.
fix it
>
>> + case hwmon_humidity:
>> + switch (attr) {
>> + case hwmon_humidity_input:
>> + *val = humidity1_input_show(dev);
>> + return 0;
>> + case hwmon_humidity_alarm:
>> + *val = humidity1_alarm_show(dev);
>> + return 0;
>> + case hwmon_humidity_max:
>> + index = limit_max;
>> + break;
>> + case hwmon_humidity_max_hyst:
>> + index = limit_max_hyst;
>> + break;
>> + case hwmon_humidity_min:
>> + index = limit_min;
>> + break;
>> + case hwmon_humidity_min_hyst:
>> + index = limit_min_hyst;
>> + break;
>> + default:
>> + return -EINVAL;
> -EOPNOTSUPP
>> + }
>> + *val = humidity1_limit_show(dev, index);
>> + return 0;
>> + default:
>> + return -EINVAL;
> -EOPNOTSUPP
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int sht3x_write(struct device *dev, enum hwmon_sensor_types type,
>> + u32 attr, int channel, long val)
>> +{
>> + enum sht3x_limits index;
>> +
>> + switch (type) {
>> + case hwmon_chip:
>> + switch (attr) {
>> + case hwmon_chip_update_interval:
>> + return update_interval_store(dev, (const char *)&val);
>> + default:
>> + return -EINVAL;
> -EOPNOTSUPP
>> + }
>> + case hwmon_temp:
>> + switch (attr) {
>> + case hwmon_temp_max:
>> + index = limit_max;
>> + break;
>> + case hwmon_temp_max_hyst:
>> + index = limit_max_hyst;
>> + break;
>> + case hwmon_temp_min:
>> + index = limit_min;
>> + break;
>> + case hwmon_temp_min_hyst:
>> + index = limit_min_hyst;
>> + break;
>> + default:
>> + return -EINVAL;
> -EOPNOTSUPP
>
>> + }
>> + return temp1_limit_store(dev, index, (const char *)&val);
>> + case hwmon_humidity:
>> + switch (attr) {
>> + case hwmon_humidity_max:
>> + index = limit_max;
>> + break;
>> + case hwmon_humidity_max_hyst:
>> + index = limit_max_hyst;
>> + break;
>> + case hwmon_humidity_min:
>> + index = limit_min;
>> + break;
>> + case hwmon_humidity_min_hyst:
>> + index = limit_min_hyst;
>> + break;
>> + default:
>> + return -EINVAL;
> -EOPNOTSUPP
>> + }
>> + return humidity1_limit_store(dev, index, (const char *)val);
>> + default:
>> + return -EINVAL;
> -EOPNOTSUPP
>> + }
>> +}
>>
>> static int sht3x_probe(struct i2c_client *client)
>> {
>> @@ -730,7 +862,6 @@ static int sht3x_probe(struct i2c_client *client)
>> struct device *hwmon_dev;
>> struct i2c_adapter *adap = client->adapter;
>> struct device *dev = &client->dev;
>> - const struct attribute_group **attribute_groups;
>>
>> /*
>> * we require full i2c support since the sht3x uses multi-byte read and
>> @@ -771,15 +902,11 @@ static int sht3x_probe(struct i2c_client *client)
>> if (ret)
>> return ret;
>>
>> - if (i2c_match_id(sht3x_ids, client)->driver_data == sts3x)
>> - attribute_groups = sts3x_groups;
>> - else
>> - attribute_groups = sht3x_groups;
>> -
>> - hwmon_dev = devm_hwmon_device_register_with_groups(dev,
>> - client->name,
>> - data,
>> - attribute_groups);
>> + hwmon_dev = devm_hwmon_device_register_with_info(dev,
>> + client->name,
>> + data,
>> + &sht3x_chip_info,
>> + sht3x_groups);
> Shouldn't sht3x_groups only be added if the chip is sts3x ?
all functionality are registered, but as for sts3x, humidity-related
hwmon-interface
will be invisble.
The code listed below is defined in sht3x_is_visble, I also notice that
if return value
is zero, the attribute will not be created.
case hwmon_humidity:
+ if (i2c_match_id(sht3x_ids, client)->driver_data == sts3x)
+ return 0;
>
>>
>> if (IS_ERR(hwmon_dev))
>> dev_dbg(dev, "unable to register hwmon device\n");
>> --
>> 2.30.2
>>
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