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Date: Thu, 02 Jul 2015 18:26:51 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Constantine Shulyupin <const@...eLinux.com>, jdelvare@...e.de,
lm-sensors@...sensors.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: (nct7802) Add fan output control
Hi Constantine,
On 07/02/2015 03:40 PM, Constantine Shulyupin wrote:
> Notes:
>
> Some lines intentionally more than 80 characters because wrapping
> this lines decreases readability.
> The patch was checked with scripts/checkpatch.pl --max-line-length=88
>
> Following code is not typecasting.
> It is inline struct attribute_group definition using compound literal.
> (See https://gcc.gnu.org/onlinedocs/gcc-3.2.2/gcc/Compound-Literals.html)
>
> static const struct attribute_group *nct7802_groups[] = {
> ...
> &(const struct attribute_group){ .attrs = fan_output_attributes },
> ...
>
I still don't like it. See below.
> Reference:
>
> Nuvoton Hardware Monitoring IC NCT7802Y
> 7.2.91 Fan Control 1 Output Value
> Location : Index 60h
>
> 7.2.92 Fan Control 2 Output Value
> Location : Index 61h
>
> 7.2.93 Fan Control 3 Output Value
> Location : Index 62h
>
This all doesn't really belong into the change log.
> Signed-off-by: Constantine Shulyupin <const@...eLinux.com>
> ---
> drivers/hwmon/nct7802.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 45 insertions(+)
>
> diff --git a/drivers/hwmon/nct7802.c b/drivers/hwmon/nct7802.c
> index afa242d..56d3547 100644
> --- a/drivers/hwmon/nct7802.c
> +++ b/drivers/hwmon/nct7802.c
> @@ -102,6 +102,38 @@ static ssize_t store_temp_type(struct device *dev,
> return err ? : count;
> }
>
> +static ssize_t show_dec(struct device *dev, struct device_attribute *devattr, char *buf)
Please make this show_pwm.
> +{
> + int ret = -1;
> + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> + struct nct7802_data *data = dev_get_drvdata(dev);
> + unsigned int val = 0;
> +
> + ret = regmap_read(data->regmap, attr->index, &val);
> + if (ret < 0)
> + return ret;
> +
> + ret = sprintf(buf, "%d\n", val);
> + return ret;
return sprintf(buf, "%d\n", val);
> +}
> +
> +static ssize_t store_u8(struct device *dev, struct device_attribute *devattr,
> + const char *buf, size_t count)
store_pwm, and please align the continuation line with '('.
> +{
> + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> + struct nct7802_data *data = dev_get_drvdata(dev);
> + int err;
> + unsigned int val;
> +
> + err = kstrtouint(buf, 0, &val);
> + if (err < 0)
> + return err;
> + if (val > 0xFF)
> + return -EINVAL;
You might consider using kstrtou8 instead.
> +
> + err = regmap_write(data->regmap, attr->index, val);
> + return err ? : count;
> +}
>
> static int nct7802_read_temp(struct nct7802_data *data,
> u8 reg_temp, u8 reg_temp_low, int *temp)
> @@ -735,6 +767,11 @@ static SENSOR_DEVICE_ATTR_2(fan3_alarm, S_IRUGO, show_alarm, NULL, 0x1a, 2);
> static SENSOR_DEVICE_ATTR_2(fan3_beep, S_IRUGO | S_IWUSR, show_beep, store_beep,
> 0x5b, 2);
>
> +/* 7.2.91... Fan Control Output Value */
> +static SENSOR_DEVICE_ATTR(fan1_output, S_IRUGO | S_IWUSR, show_dec, store_u8, 0x60);
> +static SENSOR_DEVICE_ATTR(fan2_output, S_IRUGO | S_IWUSR, show_dec, store_u8, 0x61);
> +static SENSOR_DEVICE_ATTR(fan3_output, S_IRUGO | S_IWUSR, show_dec, store_u8, 0x62);
> +
Please use pwm[1-3] for the attribute names.
> static struct attribute *nct7802_fan_attrs[] = {
> &sensor_dev_attr_fan1_input.dev_attr.attr,
> &sensor_dev_attr_fan1_min.dev_attr.attr,
> @@ -773,10 +810,18 @@ static struct attribute_group nct7802_fan_group = {
> .is_visible = nct7802_fan_is_visible,
> };
>
> +static struct attribute *fan_output_attributes[] = {
> + &sensor_dev_attr_fan1_output.dev_attr.attr,
> + &sensor_dev_attr_fan2_output.dev_attr.attr,
> + &sensor_dev_attr_fan3_output.dev_attr.attr,
> + NULL
> +};
> +
Please use an explicit variable for the group, similar to the other groups.
I would suggest to use nct7802_pwm_attrs and nct7802_pwm_group.
_attrs is a naming convention used by macros such as ATTRIBUTE_GROUPS,
so it makes sense to stick with it.
> static const struct attribute_group *nct7802_groups[] = {
> &nct7802_temp_group,
> &nct7802_in_group,
> &nct7802_fan_group,
> + &(const struct attribute_group){ .attrs = fan_output_attributes },
... as I am not in favor of such constructs.
Thanks,
Guenter
> NULL
> };
>
>
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