LXR linux/drivers/iio/accel/ssp_accel

   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/buffer.h>
  19#include <linux/iio/kfifo_buf.h>
  20#include <linux/module.h>
  21#include <linux/platform_device.h>
  22#include <linux/slab.h>
  23#include "../common/ssp_sensors/ssp_iio_sensor.h"
  24
  25#define SSP_CHANNEL_COUNT 3
  26
  27#define SSP_ACCEL_NAME "ssp-accelerometer"
  28static const char ssp_accel_device_name[] = SSP_ACCEL_NAME;
  29
  30enum ssp_accel_3d_channel {
  31        SSP_CHANNEL_SCAN_INDEX_X,
  32        SSP_CHANNEL_SCAN_INDEX_Y,
  33        SSP_CHANNEL_SCAN_INDEX_Z,
  34        SSP_CHANNEL_SCAN_INDEX_TIME,
  35};
  36
  37static int ssp_accel_read_raw(struct iio_dev *indio_dev,
  38                              struct iio_chan_spec const *chan,  int *val,
  39                              int *val2, long mask)
  40{
  41        u32 t;
  42        struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
  43
  44        switch (mask) {
  45        case IIO_CHAN_INFO_SAMP_FREQ:
  46                t = ssp_get_sensor_delay(data, SSP_ACCELEROMETER_SENSOR);
  47                ssp_convert_to_freq(t, val, val2);
  48                return IIO_VAL_INT_PLUS_MICRO;
  49        default:
  50                break;
  51        }
  52
  53        return -EINVAL;
  54}
  55
  56static int ssp_accel_write_raw(struct iio_dev *indio_dev,
  57                               struct iio_chan_spec const *chan, int val,
  58                               int val2, long mask)
  59{
  60        int ret;
  61        struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
  62
  63        switch (mask) {
  64        case IIO_CHAN_INFO_SAMP_FREQ:
  65                ret = ssp_convert_to_time(val, val2);
  66                ret = ssp_change_delay(data, SSP_ACCELEROMETER_SENSOR, ret);
  67                if (ret < 0)
  68                        dev_err(&indio_dev->dev, "accel sensor enable fail\n");
  69
  70                return ret;
  71        default:
  72                break;
  73        }
  74
  75        return -EINVAL;
  76}
  77
  78static const struct iio_info ssp_accel_iio_info = {
  79        .read_raw = &ssp_accel_read_raw,
  80        .write_raw = &ssp_accel_write_raw,
  81};
  82
  83static const unsigned long ssp_accel_scan_mask[] = { 0x7, 0, };
  84
  85static const struct iio_chan_spec ssp_acc_channels[] = {
  86        SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_X, SSP_CHANNEL_SCAN_INDEX_X),
  87        SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_Y, SSP_CHANNEL_SCAN_INDEX_Y),
  88        SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_Z, SSP_CHANNEL_SCAN_INDEX_Z),
  89        SSP_CHAN_TIMESTAMP(SSP_CHANNEL_SCAN_INDEX_TIME),
  90};
  91
  92static int ssp_process_accel_data(struct iio_dev *indio_dev, void *buf,
  93                                  int64_t timestamp)
  94{
  95        return ssp_common_process_data(indio_dev, buf, SSP_ACCELEROMETER_SIZE,
  96                                       timestamp);
  97}
  98
  99static const struct iio_buffer_setup_ops ssp_accel_buffer_ops = {
 100        .postenable = &ssp_common_buffer_postenable,
 101        .postdisable = &ssp_common_buffer_postdisable,
 102};
 103
 104static int ssp_accel_probe(struct platform_device *pdev)
 105{
 106        int ret;
 107        struct iio_dev *indio_dev;
 108        struct ssp_sensor_data *spd;
 109        struct iio_buffer *buffer;
 110
 111        indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*spd));
 112        if (!indio_dev)
 113                return -ENOMEM;
 114
 115        spd = iio_priv(indio_dev);
 116
 117        spd->process_data = ssp_process_accel_data;
 118        spd->type = SSP_ACCELEROMETER_SENSOR;
 119
 120        indio_dev->name = ssp_accel_device_name;
 121        indio_dev->dev.parent = &pdev->dev;
 122        indio_dev->dev.of_node = pdev->dev.of_node;
 123        indio_dev->info = &ssp_accel_iio_info;
 124        indio_dev->modes = INDIO_BUFFER_SOFTWARE;
 125        indio_dev->channels = ssp_acc_channels;
 126        indio_dev->num_channels = ARRAY_SIZE(ssp_acc_channels);
 127        indio_dev->available_scan_masks = ssp_accel_scan_mask;
 128
 129        buffer = devm_iio_kfifo_allocate(&pdev->dev);
 130        if (!buffer)
 131                return -ENOMEM;
 132
 133        iio_device_attach_buffer(indio_dev, buffer);
 134
 135        indio_dev->setup_ops = &ssp_accel_buffer_ops;
 136
 137        platform_set_drvdata(pdev, indio_dev);
 138
 139        ret = devm_iio_device_register(&pdev->dev, indio_dev);
 140        if (ret < 0)
 141                return ret;
 142
 143        /* ssp registering should be done after all iio setup */
 144        ssp_register_consumer(indio_dev, SSP_ACCELEROMETER_SENSOR);
 145
 146        return 0;
 147}
 148
 149static struct platform_driver ssp_accel_driver = {
 150        .driver = {
 151                .name = SSP_ACCEL_NAME,
 152        },
 153        .probe = ssp_accel_probe,
 154};
 155
 156module_platform_driver(ssp_accel_driver);
 157
 158MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
 159MODULE_DESCRIPTION("Samsung sensorhub accelerometers driver");
 160MODULE_LICENSE("GPL");
 161