LXR linux/drivers/iio/gyro/ssp_gyro

   1/*
   2 *  Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
   3 *
   4 *  This program is free software; you can redistribute it and/or modify
   5 *  it under the terms of the GNU General Public License as published by
   6 *  the Free Software Foundation; either version 2 of the License, or
   7 *  (at your option) any later version.
   8 *
   9 *  This program is distributed in the hope that it will be useful,
  10 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 *  GNU General Public License for more details.
  13 *
  14 */
  15
  16#include <linux/iio/common/ssp_sensors.h>
  17#include <linux/iio/iio.h>
  18#include <linux/iio/kfifo_buf.h>
  19#include <linux/module.h>
  20#include <linux/platform_device.h>
  21#include <linux/slab.h>
  22#include "../common/ssp_sensors/ssp_iio_sensor.h"
  23
  24#define SSP_CHANNEL_COUNT 3
  25
  26#define SSP_GYROSCOPE_NAME "ssp-gyroscope"
  27static const char ssp_gyro_name[] = SSP_GYROSCOPE_NAME;
  28
  29enum ssp_gyro_3d_channel {
  30        SSP_CHANNEL_SCAN_INDEX_X,
  31        SSP_CHANNEL_SCAN_INDEX_Y,
  32        SSP_CHANNEL_SCAN_INDEX_Z,
  33        SSP_CHANNEL_SCAN_INDEX_TIME,
  34};
  35
  36static int ssp_gyro_read_raw(struct iio_dev *indio_dev,
  37                             struct iio_chan_spec const *chan, int *val,
  38                             int *val2, long mask)
  39{
  40        u32 t;
  41        struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
  42
  43        switch (mask) {
  44        case IIO_CHAN_INFO_SAMP_FREQ:
  45                t = ssp_get_sensor_delay(data, SSP_GYROSCOPE_SENSOR);
  46                ssp_convert_to_freq(t, val, val2);
  47                return IIO_VAL_INT_PLUS_MICRO;
  48        default:
  49                break;
  50        }
  51
  52        return -EINVAL;
  53}
  54
  55static int ssp_gyro_write_raw(struct iio_dev *indio_dev,
  56                              struct iio_chan_spec const *chan, int val,
  57                              int val2, long mask)
  58{
  59        int ret;
  60        struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
  61
  62        switch (mask) {
  63        case IIO_CHAN_INFO_SAMP_FREQ:
  64                ret = ssp_convert_to_time(val, val2);
  65                ret = ssp_change_delay(data, SSP_GYROSCOPE_SENSOR, ret);
  66                if (ret < 0)
  67                        dev_err(&indio_dev->dev, "gyro sensor enable fail\n");
  68
  69                return ret;
  70        default:
  71                break;
  72        }
  73
  74        return -EINVAL;
  75}
  76
  77static struct iio_info ssp_gyro_iio_info = {
  78        .read_raw = &ssp_gyro_read_raw,
  79        .write_raw = &ssp_gyro_write_raw,
  80};
  81
  82static const unsigned long ssp_gyro_scan_mask[] = { 0x07, 0, };
  83
  84static const struct iio_chan_spec ssp_gyro_channels[] = {
  85        SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_X, SSP_CHANNEL_SCAN_INDEX_X),
  86        SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_Y, SSP_CHANNEL_SCAN_INDEX_Y),
  87        SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_Z, SSP_CHANNEL_SCAN_INDEX_Z),
  88        SSP_CHAN_TIMESTAMP(SSP_CHANNEL_SCAN_INDEX_TIME),
  89};
  90
  91static int ssp_process_gyro_data(struct iio_dev *indio_dev, void *buf,
  92                                 int64_t timestamp)
  93{
  94        return ssp_common_process_data(indio_dev, buf, SSP_GYROSCOPE_SIZE,
  95                                       timestamp);
  96}
  97
  98static const struct iio_buffer_setup_ops ssp_gyro_buffer_ops = {
  99        .postenable = &ssp_common_buffer_postenable,
 100        .postdisable = &ssp_common_buffer_postdisable,
 101};
 102
 103static int ssp_gyro_probe(struct platform_device *pdev)
 104{
 105        int ret;
 106        struct iio_dev *indio_dev;
 107        struct ssp_sensor_data *spd;
 108        struct iio_buffer *buffer;
 109
 110        indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*spd));
 111        if (!indio_dev)
 112                return -ENOMEM;
 113
 114        spd = iio_priv(indio_dev);
 115
 116        spd->process_data = ssp_process_gyro_data;
 117        spd->type = SSP_GYROSCOPE_SENSOR;
 118
 119        indio_dev->name = ssp_gyro_name;
 120        indio_dev->dev.parent = &pdev->dev;
 121        indio_dev->info = &ssp_gyro_iio_info;
 122        indio_dev->modes = INDIO_BUFFER_SOFTWARE;
 123        indio_dev->channels = ssp_gyro_channels;
 124        indio_dev->num_channels = ARRAY_SIZE(ssp_gyro_channels);
 125        indio_dev->available_scan_masks = ssp_gyro_scan_mask;
 126
 127        buffer = devm_iio_kfifo_allocate(&pdev->dev);
 128        if (!buffer)
 129                return -ENOMEM;
 130
 131        iio_device_attach_buffer(indio_dev, buffer);
 132
 133        indio_dev->setup_ops = &ssp_gyro_buffer_ops;
 134
 135        platform_set_drvdata(pdev, indio_dev);
 136
 137        ret = iio_device_register(indio_dev);
 138        if (ret < 0)
 139                return ret;
 140
 141        /* ssp registering should be done after all iio setup */
 142        ssp_register_consumer(indio_dev, SSP_GYROSCOPE_SENSOR);
 143
 144        return 0;
 145}
 146
 147static int ssp_gyro_remove(struct platform_device *pdev)
 148{
 149        struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 150
 151        iio_device_unregister(indio_dev);
 152
 153        return 0;
 154}
 155
 156static struct platform_driver ssp_gyro_driver = {
 157        .driver = {
 158                .name = SSP_GYROSCOPE_NAME,
 159        },
 160        .probe = ssp_gyro_probe,
 161        .remove = ssp_gyro_remove,
 162};
 163
 164module_platform_driver(ssp_gyro_driver);
 165
 166MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
 167MODULE_DESCRIPTION("Samsung sensorhub gyroscopes driver");
 168MODULE_LICENSE("GPL");
 169