common/ssp_sensors/ssp_iio.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
0004  */
0005
0006 #include <linux/iio/common/ssp_sensors.h>
0007 #include <linux/iio/buffer.h>
0008 #include <linux/iio/kfifo_buf.h>
0009 #include <linux/module.h>
0010 #include <linux/slab.h>
0011 #include "ssp_iio_sensor.h"
0012
0013 /**
0014  * ssp_common_buffer_postenable() - generic postenable callback for ssp buffer
0015  *
0016  * @indio_dev:      iio device
0017  *
0018  * Returns 0 or negative value in case of error
0019  */
0020 int ssp_common_buffer_postenable(struct iio_dev *indio_dev)
0021 {
0022     struct ssp_sensor_data *spd = iio_priv(indio_dev);
0023     struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
0024
0025     /* the allocation is made in post because scan size is known in this
0026      * moment
0027      * */
0028     spd->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL | GFP_DMA);
0029     if (!spd->buffer)
0030         return -ENOMEM;
0031
0032     return ssp_enable_sensor(data, spd->type,
0033                  ssp_get_sensor_delay(data, spd->type));
0034 }
0035 EXPORT_SYMBOL_NS(ssp_common_buffer_postenable, IIO_SSP_SENSORS);
0036
0037 /**
0038  * ssp_common_buffer_postdisable() - generic postdisable callback for ssp buffer
0039  *
0040  * @indio_dev:      iio device
0041  *
0042  * Returns 0 or negative value in case of error
0043  */
0044 int ssp_common_buffer_postdisable(struct iio_dev *indio_dev)
0045 {
0046     int ret;
0047     struct ssp_sensor_data *spd = iio_priv(indio_dev);
0048     struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
0049
0050     ret = ssp_disable_sensor(data, spd->type);
0051     if (ret < 0)
0052         return ret;
0053
0054     kfree(spd->buffer);
0055
0056     return ret;
0057 }
0058 EXPORT_SYMBOL_NS(ssp_common_buffer_postdisable, IIO_SSP_SENSORS);
0059
0060 /**
0061  * ssp_common_process_data() - Common process data callback for ssp sensors
0062  *
0063  * @indio_dev:      iio device
0064  * @buf:        source buffer
0065  * @len:        sensor data length
0066  * @timestamp:      system timestamp
0067  *
0068  * Returns 0 or negative value in case of error
0069  */
0070 int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
0071                 unsigned int len, int64_t timestamp)
0072 {
0073     __le32 time;
0074     int64_t calculated_time = 0;
0075     struct ssp_sensor_data *spd = iio_priv(indio_dev);
0076
0077     if (indio_dev->scan_bytes == 0)
0078         return 0;
0079
0080     /*
0081      * it always sends full set of samples, remember about available masks
0082      */
0083     memcpy(spd->buffer, buf, len);
0084
0085     if (indio_dev->scan_timestamp) {
0086         memcpy(&time, &((char *)buf)[len], SSP_TIME_SIZE);
0087         calculated_time =
0088             timestamp + (int64_t)le32_to_cpu(time) * 1000000;
0089     }
0090
0091     return iio_push_to_buffers_with_timestamp(indio_dev, spd->buffer,
0092                           calculated_time);
0093 }
0094 EXPORT_SYMBOL_NS(ssp_common_process_data, IIO_SSP_SENSORS);
0095
0096 MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
0097 MODULE_DESCRIPTION("Samsung sensorhub commons");
0098 MODULE_LICENSE("GPL");
0099 MODULE_IMPORT_NS(IIO_SSP_SENSORS);