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/*
* 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 <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");
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