160 строки
4.2 KiB
C
160 строки
4.2 KiB
C
/*
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* Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/iio/common/ssp_sensors.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/kfifo_buf.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include "../common/ssp_sensors/ssp_iio_sensor.h"
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#define SSP_CHANNEL_COUNT 3
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#define SSP_GYROSCOPE_NAME "ssp-gyroscope"
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static const char ssp_gyro_name[] = SSP_GYROSCOPE_NAME;
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enum ssp_gyro_3d_channel {
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SSP_CHANNEL_SCAN_INDEX_X,
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SSP_CHANNEL_SCAN_INDEX_Y,
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SSP_CHANNEL_SCAN_INDEX_Z,
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SSP_CHANNEL_SCAN_INDEX_TIME,
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};
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static int ssp_gyro_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int *val,
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int *val2, long mask)
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{
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u32 t;
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struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
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switch (mask) {
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case IIO_CHAN_INFO_SAMP_FREQ:
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t = ssp_get_sensor_delay(data, SSP_GYROSCOPE_SENSOR);
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ssp_convert_to_freq(t, val, val2);
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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break;
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}
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return -EINVAL;
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}
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static int ssp_gyro_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int val,
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int val2, long mask)
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{
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int ret;
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struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
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switch (mask) {
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case IIO_CHAN_INFO_SAMP_FREQ:
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ret = ssp_convert_to_time(val, val2);
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ret = ssp_change_delay(data, SSP_GYROSCOPE_SENSOR, ret);
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if (ret < 0)
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dev_err(&indio_dev->dev, "gyro sensor enable fail\n");
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return ret;
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default:
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break;
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}
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return -EINVAL;
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}
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static const struct iio_info ssp_gyro_iio_info = {
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.read_raw = &ssp_gyro_read_raw,
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.write_raw = &ssp_gyro_write_raw,
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};
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static const unsigned long ssp_gyro_scan_mask[] = { 0x07, 0, };
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static const struct iio_chan_spec ssp_gyro_channels[] = {
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SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_X, SSP_CHANNEL_SCAN_INDEX_X),
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SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_Y, SSP_CHANNEL_SCAN_INDEX_Y),
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SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_Z, SSP_CHANNEL_SCAN_INDEX_Z),
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SSP_CHAN_TIMESTAMP(SSP_CHANNEL_SCAN_INDEX_TIME),
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};
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static int ssp_process_gyro_data(struct iio_dev *indio_dev, void *buf,
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int64_t timestamp)
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{
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return ssp_common_process_data(indio_dev, buf, SSP_GYROSCOPE_SIZE,
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timestamp);
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}
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static const struct iio_buffer_setup_ops ssp_gyro_buffer_ops = {
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.postenable = &ssp_common_buffer_postenable,
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.postdisable = &ssp_common_buffer_postdisable,
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};
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static int ssp_gyro_probe(struct platform_device *pdev)
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{
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int ret;
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struct iio_dev *indio_dev;
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struct ssp_sensor_data *spd;
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struct iio_buffer *buffer;
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indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*spd));
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if (!indio_dev)
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return -ENOMEM;
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spd = iio_priv(indio_dev);
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spd->process_data = ssp_process_gyro_data;
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spd->type = SSP_GYROSCOPE_SENSOR;
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indio_dev->name = ssp_gyro_name;
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indio_dev->dev.parent = &pdev->dev;
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indio_dev->info = &ssp_gyro_iio_info;
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indio_dev->modes = INDIO_BUFFER_SOFTWARE;
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indio_dev->channels = ssp_gyro_channels;
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indio_dev->num_channels = ARRAY_SIZE(ssp_gyro_channels);
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indio_dev->available_scan_masks = ssp_gyro_scan_mask;
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buffer = devm_iio_kfifo_allocate(&pdev->dev);
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if (!buffer)
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return -ENOMEM;
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iio_device_attach_buffer(indio_dev, buffer);
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indio_dev->setup_ops = &ssp_gyro_buffer_ops;
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platform_set_drvdata(pdev, indio_dev);
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ret = devm_iio_device_register(&pdev->dev, indio_dev);
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if (ret < 0)
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return ret;
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/* ssp registering should be done after all iio setup */
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ssp_register_consumer(indio_dev, SSP_GYROSCOPE_SENSOR);
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return 0;
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}
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static struct platform_driver ssp_gyro_driver = {
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.driver = {
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.name = SSP_GYROSCOPE_NAME,
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},
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.probe = ssp_gyro_probe,
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};
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module_platform_driver(ssp_gyro_driver);
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MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
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MODULE_DESCRIPTION("Samsung sensorhub gyroscopes driver");
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MODULE_LICENSE("GPL");
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