Re: [PATCH v2 3/5] iio: sensorhub: Add sensorhub iio commons

[Hartmut Knaack <knaack.h@gmx.de>]

Karol Wrona schrieb am 21.11.2014 um 19:19:
> This patch adds common library for sensorhub iio drivers.
> 
Some comments inline.
> Signed-off-by: Karol Wrona <k.wrona@samsung.com>
> Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
> ---
>  drivers/iio/common/Kconfig                      |    1 +
>  drivers/iio/common/Makefile                     |    1 +
>  drivers/iio/common/ssp_sensors/Kconfig          |   13 ++++
>  drivers/iio/common/ssp_sensors/Makefile         |    5 ++
>  drivers/iio/common/ssp_sensors/ssp_iio.c        |   81 +++++++++++++++++++++++
>  drivers/iio/common/ssp_sensors/ssp_iio_sensor.h |   59 +++++++++++++++++
>  6 files changed, 160 insertions(+)
>  create mode 100644 drivers/iio/common/ssp_sensors/Kconfig
>  create mode 100644 drivers/iio/common/ssp_sensors/Makefile
>  create mode 100644 drivers/iio/common/ssp_sensors/ssp_iio.c
>  create mode 100644 drivers/iio/common/ssp_sensors/ssp_iio_sensor.h
> 
> diff --git a/drivers/iio/common/Kconfig b/drivers/iio/common/Kconfig
> index 0b6e97d..630f9d8 100644
> --- a/drivers/iio/common/Kconfig
> +++ b/drivers/iio/common/Kconfig
> @@ -4,3 +4,4 @@
>  
>  source "drivers/iio/common/hid-sensors/Kconfig"
>  source "drivers/iio/common/st_sensors/Kconfig"
> +source "drivers/iio/common/ssp_sensors/Kconfig"
Maintain alphabetic order.
> diff --git a/drivers/iio/common/Makefile b/drivers/iio/common/Makefile
> index 3112df0..5119642 100644
> --- a/drivers/iio/common/Makefile
> +++ b/drivers/iio/common/Makefile
> @@ -9,3 +9,4 @@
>  # When adding new entries keep the list in alphabetical order
>  obj-y += hid-sensors/
>  obj-y += st_sensors/
> +obj-y += ssp_sensors/
Maintain alphabetic order.
> diff --git a/drivers/iio/common/ssp_sensors/Kconfig b/drivers/iio/common/ssp_sensors/Kconfig
> new file mode 100644
> index 0000000..3c10f6f
> --- /dev/null
> +++ b/drivers/iio/common/ssp_sensors/Kconfig
> @@ -0,0 +1,13 @@
> +#
> +# SSP Sensor common modules
> +#
> +menu "SSP Sensor IIO Common"
Do we need to mention IIO here, again?
> +
> +config SSP_SENSOR_IIO
Better call it IIO_SSP_SENSOR.
> +	tristate "Commons for all SSP Sensor IIO drivers"
> +	depends on SENSORS_SAMSUNG_SSP
> +	select IIO_BUFFER
> +	help
> +	  Say yes here to build commons for SSP sensors.
Or build as a module named ssp_iio.
> +
> +endmenu
> diff --git a/drivers/iio/common/ssp_sensors/Makefile b/drivers/iio/common/ssp_sensors/Makefile
> new file mode 100644
> index 0000000..f39f109
> --- /dev/null
> +++ b/drivers/iio/common/ssp_sensors/Makefile
> @@ -0,0 +1,5 @@
> +#
> +# Makefile for the SSP sensor common modules.
> +#
> +
> +obj-$(CONFIG_SSP_SENSOR_IIO) += ssp_iio.o
> diff --git a/drivers/iio/common/ssp_sensors/ssp_iio.c b/drivers/iio/common/ssp_sensors/ssp_iio.c
> new file mode 100644
> index 0000000..bbe9e5e
> --- /dev/null
> +++ b/drivers/iio/common/ssp_sensors/ssp_iio.c
> @@ -0,0 +1,81 @@
> +/*
> + *  Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
> + *
> + *  This program is free software; you can redistribute it and/or modify
> + *  it under the terms of the GNU General Public License as published by
> + *  the Free Software Foundation; either version 2 of the License, or
> + *  (at your option) any later version.
> + *
> + *  This program is distributed in the hope that it will be useful,
> + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
> + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + *  GNU General Public License for more details.
> + *
> + */
> +
> +#include <linux/iio/common/ssp_sensors.h>
> +#include <linux/iio/kfifo_buf.h>
> +#include "ssp_iio_sensor.h"
> +
> +/**
> + * ssp_common_buffer_postenable() - generic postenable callback for ssp buffer
> + *
> + * @indio_dev:		iio device
> + *
> + * Returns 0 or negative value in case of error
> + */
> +int ssp_common_buffer_postenable(struct iio_dev *indio_dev)
> +{
> +	struct ssp_sensor_data *c = iio_priv(indio_dev);
> +	struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
> +
> +	return ssp_enable_sensor(data, c->type,
> +				ssp_get_sensor_delay(data, c->type));
Improve indentation.
> +}
> +EXPORT_SYMBOL(ssp_common_buffer_postenable);
> +
> +/**
> + * ssp_common_buffer_predisable() - generic predisable callback for ssp buffer
> + *
> + * @indio_dev:		iio device
> + *
> + * Returns 0 or negative value in case of error
> + */
> +int ssp_common_buffer_predisable(struct iio_dev *indio_dev)
> +{
> +	struct ssp_sensor_data *c = iio_priv(indio_dev);
> +	struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
> +
> +	return ssp_disable_sensor(data, c->type);
> +}
> +EXPORT_SYMBOL(ssp_common_buffer_predisable);
> +
> +/**
> + * ssp_common_setup_buffer() - creates iio kfifo and registers the buffer for device
Wrap comment.
> + *
> + * @indio_dev:		iio device
> + *
> + * Returns 0 or negative value in case of error
> + */
> +int ssp_common_setup_buffer(struct iio_dev *indio_dev,
> +			    const struct iio_buffer_setup_ops *ops)
> +{
> +	int ret;
> +	struct iio_buffer *buffer;
> +
> +	buffer = iio_kfifo_allocate(indio_dev);
> +	if (!buffer)
> +		return -ENOMEM;
> +
> +	iio_device_attach_buffer(indio_dev, buffer);
> +
> +	indio_dev->setup_ops = ops;
> +
> +	ret = iio_buffer_register(indio_dev, indio_dev->channels,
> +				  indio_dev->num_channels);
> +	if (ret)
> +		iio_kfifo_free(buffer);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL(ssp_common_setup_buffer);
> diff --git a/drivers/iio/common/ssp_sensors/ssp_iio_sensor.h b/drivers/iio/common/ssp_sensors/ssp_iio_sensor.h
> new file mode 100644
> index 0000000..bf4a6ad
> --- /dev/null
> +++ b/drivers/iio/common/ssp_sensors/ssp_iio_sensor.h
> @@ -0,0 +1,59 @@
> +#ifndef __SSP_IIO_SENSOR_H__
> +#define __SSP_IIO_SENSOR_H__
> +
> +#define SSP_CHANNEL_AG(_type, _mod, _index) \
> +{ \
> +		.type = _type,\
> +		.modified = 1,\
> +		.channel2 = _mod,\
> +		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ),\
> +		.scan_index = _index,\
> +		.scan_type = {\
> +			.sign = 's',\
> +			.realbits = 16,\
> +			.storagebits = 16,\
> +			.shift = 0,\
> +			.endianness = IIO_LE,\
> +		},\
> +}
> +
> +#define SSP_DIVISOR	1000000ULL
> +#define SSP_MS_PER_S	1000
> +#define SSP_DIVIDEND	(SSP_DIVISOR * SSP_MS_PER_S)
> +
> +int ssp_common_buffer_postenable(struct iio_dev *indio_dev);
> +
> +int ssp_common_buffer_predisable(struct iio_dev *indio_dev);
> +
> +int ssp_common_setup_buffer(struct iio_dev *indio_dev,
> +			    const struct iio_buffer_setup_ops *ops);
> +
> +/* Converts time in ms to frequency */
> +static inline void ssp_convert_to_freq(u32 time, int *integer_part,
> +				       int *fractional)
> +{
> +	unsigned int value;
> +
> +	if (time == 0) {
> +		*fractional = 0;
> +		*integer_part = 0;
> +		return;
> +	}
> +
> +	value = SSP_DIVIDEND / time;
> +	*fractional = value % SSP_DIVISOR;
> +	*integer_part = value / SSP_DIVISOR;
do_div() does the same, but could make value obsolete.
> +}
> +
> +/* Converts frequency to time in ms*/
Missing whitespace at end of comment.
> +static inline int ssp_convert_to_time(int integer_part, int fractional)
> +{
> +	u64 value;
> +
> +	value = integer_part * SSP_DIVISOR + fractional;
> +	if (value == 0)
> +		return 0;
> +
> +	return  div_u64(SSP_DIVIDEND, value);
Double whitespace.
> +}
> +#endif /* __SSP_IIO_SENSOR_H__ */
>