drivers/iio/common/ssp_sensors/ssp_iio.c

/*
 *  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/buffer.h>
#include <linux/iio/kfifo_buf.h>
#include <linux/module.h>
#include <linux/slab.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 *spd = iio_priv(indio_dev);
	struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);

	/* the allocation is made in post because scan size is known in this
	 * moment
	 * */
	spd->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL | GFP_DMA);
	if (!spd->buffer)
		return -ENOMEM;

	return ssp_enable_sensor(data, spd->type,
				 ssp_get_sensor_delay(data, spd->type));
}
EXPORT_SYMBOL(ssp_common_buffer_postenable);

/**
 * ssp_common_buffer_postdisable() - generic postdisable callback for ssp buffer
 *
 * @indio_dev:		iio device
 *
 * Returns 0 or negative value in case of error
 */
int ssp_common_buffer_postdisable(struct iio_dev *indio_dev)
{
	int ret;
	struct ssp_sensor_data *spd = iio_priv(indio_dev);
	struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);

	ret = ssp_disable_sensor(data, spd->type);
	if (ret < 0)
		return ret;

	kfree(spd->buffer);

	return ret;
}
EXPORT_SYMBOL(ssp_common_buffer_postdisable);

/**
 * ssp_common_process_data() - Common process data callback for ssp sensors
 *
 * @indio_dev:		iio device
 * @buf:		source buffer
 * @len:		sensor data length
 * @timestamp:		system timestamp
 *
 * Returns 0 or negative value in case of error
 */
int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
			    unsigned int len, int64_t timestamp)
{
	__le32 time;
	int64_t calculated_time;
	struct ssp_sensor_data *spd = iio_priv(indio_dev);

	if (indio_dev->scan_bytes == 0)
		return 0;

	/*
	 * it always sends full set of samples, remember about available masks
	 */
	memcpy(spd->buffer, buf, len);

	if (indio_dev->scan_timestamp) {
		memcpy(&time, &((char *)buf)[len], SSP_TIME_SIZE);
		calculated_time =
			timestamp + (int64_t)le32_to_cpu(time) * 1000000;
	}

	return iio_push_to_buffers_with_timestamp(indio_dev, spd->buffer,
						  calculated_time);
}
EXPORT_SYMBOL(ssp_common_process_data);

MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
MODULE_DESCRIPTION("Samsung sensorhub commons");
MODULE_LICENSE("GPL");