linux-kernel - Re: [PATCH v3 4/4] hwmon: (adt7475) add high frequency support

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Date:   Thu, 11 May 2017 21:31:56 +0000
From:   Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To:     "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        "linux@...ck-us.net" <linux@...ck-us.net>
CC:     Tobi Wulff <Tobi.Wulff@...iedtelesis.co.nz>,
        Jean Delvare <jdelvare@...e.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 4/4] hwmon: (adt7475) add high frequency support

On 11/05/17 15:45, Chris Packham wrote:
> Systems using 4-wire fans usually require high frequency (22.5kHz)
> output on the pwm. Add 22500 as a valid option in the pwmfreq_table. In
> high frequency mode the low-order bit are ignored so they can safely be
> set to 0.
>
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> ---
> Changes in v3:
> - New
>
>  drivers/hwmon/adt7475.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c
> index f7322330789c..f5a65d1166cd 100644
> --- a/drivers/hwmon/adt7475.c
> +++ b/drivers/hwmon/adt7475.c
> @@ -936,7 +936,7 @@ static ssize_t set_pwmctrl(struct device *dev, struct device_attribute *attr,
>
>  /* List of frequencies for the PWM */
>  static const int pwmfreq_table[] = {
> -	11, 14, 22, 29, 35, 44, 58, 88
> +	11, 14, 22, 29, 35, 44, 58, 88, 22500
>  };
>
>  static ssize_t show_pwmfreq(struct device *dev, struct device_attribute *attr,
> @@ -944,9 +944,10 @@ static ssize_t show_pwmfreq(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);
> +	int i = clamp_val(data->range[sattr->index] & 0xf, 0,
> +			  sizeof(pwmfreq_table));

Oops that should probably be

+			  ARRAY_SIZE(pwmfreq_table) - 1);

Guenter, do you want me to send a v4 or can you fix it up at your end?

>
> -	return sprintf(buf, "%d\n",
> -		       pwmfreq_table[data->range[sattr->index] & 7]);
> +	return sprintf(buf, "%d\n", pwmfreq_table[i]);
>  }
>
>  static ssize_t set_pwmfreq(struct device *dev, struct device_attribute *attr,
> @@ -967,7 +968,7 @@ static ssize_t set_pwmfreq(struct device *dev, struct device_attribute *attr,
>
>  	data->range[sattr->index] =
>  		adt7475_read(TEMP_TRANGE_REG(sattr->index));
> -	data->range[sattr->index] &= ~7;
> +	data->range[sattr->index] &= ~0xf;
>  	data->range[sattr->index] |= out;
>
>  	i2c_smbus_write_byte_data(client, TEMP_TRANGE_REG(sattr->index),
>