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SubjectRe: [PATCH v3 2/6] hwmon: (pmbus/pim4328) Add function for reading direct mode coefficients
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On 5/24/21 8:02 AM, Erik Rosen wrote:
> Add the function pmbus_read_coefficients to pmbus_core to be able to
> read and decode the coefficients for the direct format for a certain
> command.
>
> Signed-off-by: Erik Rosen <erik.rosen@metormote.com>
> ---
> drivers/hwmon/pmbus/pmbus.h | 4 ++++
> drivers/hwmon/pmbus/pmbus_core.c | 38 ++++++++++++++++++++++++++++++++
> 2 files changed, 42 insertions(+)
>
> diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
> index 3968924f8533..d9ed9736b480 100644
> --- a/drivers/hwmon/pmbus/pmbus.h
> +++ b/drivers/hwmon/pmbus/pmbus.h
> @@ -499,6 +499,10 @@ int pmbus_get_fan_rate_cached(struct i2c_client *client, int page, int id,
> enum pmbus_fan_mode mode);
> int pmbus_update_fan(struct i2c_client *client, int page, int id,
> u8 config, u8 mask, u16 command);
> +int pmbus_read_coefficients(struct i2c_client *client,
> + struct pmbus_driver_info *info,
> + enum pmbus_sensor_classes sensor_class,
> + u8 command);
> struct dentry *pmbus_get_debugfs_dir(struct i2c_client *client);
>
> #endif /* PMBUS_H */
> diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
> index cb885efc4fba..460cbfd716e4 100644
> --- a/drivers/hwmon/pmbus/pmbus_core.c
> +++ b/drivers/hwmon/pmbus/pmbus_core.c
> @@ -301,6 +301,44 @@ int pmbus_update_fan(struct i2c_client *client, int page, int id,
> }
> EXPORT_SYMBOL_NS_GPL(pmbus_update_fan, PMBUS);
>
> +/*
> + * Read the coefficients for direct mode.
> + */
> +int pmbus_read_coefficients(struct i2c_client *client,
> + struct pmbus_driver_info *info,
> + enum pmbus_sensor_classes sensor_class,
> + u8 command)
> +{
> + int rv;
> + union i2c_smbus_data data;
> + s8 R;
> + s16 m, b;
> +
> + data.block[0] = 2;
> + data.block[1] = command;
> + data.block[2] = 0x01;
> +
> + rv = i2c_smbus_xfer(client->adapter, client->addr, client->flags,
> + I2C_SMBUS_WRITE, PMBUS_COEFFICIENTS,
> + I2C_SMBUS_BLOCK_PROC_CALL, &data);
> +
> + if (rv < 0)
> + return rv;
> +
> + if (data.block[0] != 5)
> + return -EIO;
> +
> + m = data.block[1] | (data.block[2] << 8);
> + b = data.block[3] | (data.block[4] << 8);
> + R = data.block[5];
> + info->m[sensor_class] = m;
> + info->b[sensor_class] = b;
> + info->R[sensor_class] = R;
> +
> + return rv;
> +}
> +EXPORT_SYMBOL_NS_GPL(pmbus_read_coefficients, PMBUS);

I don't think this function needs to be exported.
> +
> int pmbus_read_word_data(struct i2c_client *client, int page, int phase, u8 reg)
> {
> int rv;
>

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