// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
 */

#include <linux/iio/common/ssp_sensors.h>
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
#include <linux/iio/kfifo_buf.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include "../common/ssp_sensors/ssp_iio_sensor.h"

#define SSP_CHANNEL_COUNT 3

#define SSP_ACCEL_NAME "ssp-accelerometer"
static const char ssp_accel_device_name[] = SSP_ACCEL_NAME;

enum ssp_accel_3d_channel {
        SSP_CHANNEL_SCAN_INDEX_X,
        SSP_CHANNEL_SCAN_INDEX_Y,
        SSP_CHANNEL_SCAN_INDEX_Z,
        SSP_CHANNEL_SCAN_INDEX_TIME,
};

static int ssp_accel_read_raw(struct iio_dev *indio_dev,
                              struct iio_chan_spec const *chan,  int *val,
                              int *val2, long mask)
{
        u32 t;
        struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);

        switch (mask) {
        case IIO_CHAN_INFO_SAMP_FREQ:
                t = ssp_get_sensor_delay(data, SSP_ACCELEROMETER_SENSOR);
                ssp_convert_to_freq(t, val, val2);
                return IIO_VAL_INT_PLUS_MICRO;
        default:
                break;
        }

        return -EINVAL;
}

static int ssp_accel_write_raw(struct iio_dev *indio_dev,
                               struct iio_chan_spec const *chan, int val,
                               int val2, long mask)
{
        int ret;
        struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);

        switch (mask) {
        case IIO_CHAN_INFO_SAMP_FREQ:
                ret = ssp_convert_to_time(val, val2);
                ret = ssp_change_delay(data, SSP_ACCELEROMETER_SENSOR, ret);
                if (ret < 0)
                        dev_err(&indio_dev->dev, "accel sensor enable fail\n");

                return ret;
        default:
                break;
        }

        return -EINVAL;
}

static const struct iio_info ssp_accel_iio_info = {
        .read_raw = &ssp_accel_read_raw,
        .write_raw = &ssp_accel_write_raw,
};

static const unsigned long ssp_accel_scan_mask[] = { 0x7, 0, };

static const struct iio_chan_spec ssp_acc_channels[] = {
        SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_X, SSP_CHANNEL_SCAN_INDEX_X),
        SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_Y, SSP_CHANNEL_SCAN_INDEX_Y),
        SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_Z, SSP_CHANNEL_SCAN_INDEX_Z),
        SSP_CHAN_TIMESTAMP(SSP_CHANNEL_SCAN_INDEX_TIME),
};

static int ssp_process_accel_data(struct iio_dev *indio_dev, void *buf,
                                  int64_t timestamp)
{
        return ssp_common_process_data(indio_dev, buf, SSP_ACCELEROMETER_SIZE,
                                       timestamp);
}

static const struct iio_buffer_setup_ops ssp_accel_buffer_ops = {
        .postenable = &ssp_common_buffer_postenable,
        .postdisable = &ssp_common_buffer_postdisable,
};

static int ssp_accel_probe(struct platform_device *pdev)
{
        int ret;
        struct iio_dev *indio_dev;
        struct ssp_sensor_data *spd;

        indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*spd));
        if (!indio_dev)
                return -ENOMEM;

        spd = iio_priv(indio_dev);

        spd->process_data = ssp_process_accel_data;
        spd->type = SSP_ACCELEROMETER_SENSOR;

        indio_dev->name = ssp_accel_device_name;
        indio_dev->info = &ssp_accel_iio_info;
        indio_dev->channels = ssp_acc_channels;
        indio_dev->num_channels = ARRAY_SIZE(ssp_acc_channels);
        indio_dev->available_scan_masks = ssp_accel_scan_mask;

        ret = devm_iio_kfifo_buffer_setup(&pdev->dev, indio_dev,
                                          &ssp_accel_buffer_ops);
        if (ret)
                return ret;

        platform_set_drvdata(pdev, indio_dev);

        ret = devm_iio_device_register(&pdev->dev, indio_dev);
        if (ret < 0)
                return ret;

        /* ssp registering should be done after all iio setup */
        ssp_register_consumer(indio_dev, SSP_ACCELEROMETER_SENSOR);

        return 0;
}

static struct platform_driver ssp_accel_driver = {
        .driver = {
                .name = SSP_ACCEL_NAME,
        },
        .probe = ssp_accel_probe,
};

module_platform_driver(ssp_accel_driver);

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