drivers/iio/gyro/ssp_gyro_sensor.c

   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_GYROSCOPE_NAME "ssp-gyroscope"
  28 static const char ssp_gyro_name[] = SSP_GYROSCOPE_NAME;
  29
  30 enum ssp_gyro_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
  37 static int ssp_gyro_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_GYROSCOPE_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
  56 static int ssp_gyro_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_GYROSCOPE_SENSOR, ret);
  67                 if (ret < 0)
  68                         dev_err(&indio_dev->dev, "gyro sensor enable fail\n");
  69
  70                 return ret;
  71         default:
  72                 break;
  73         }
  74
  75         return -EINVAL;
  76 }
  77
  78 static const struct iio_info ssp_gyro_iio_info = {
  79         .read_raw = &ssp_gyro_read_raw,
  80         .write_raw = &ssp_gyro_write_raw,
  81 };
  82
  83 static const unsigned long ssp_gyro_scan_mask[] = { 0x07, 0, };
  84
  85 static const struct iio_chan_spec ssp_gyro_channels[] = {
  86         SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_X, SSP_CHANNEL_SCAN_INDEX_X),
  87         SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_Y, SSP_CHANNEL_SCAN_INDEX_Y),
  88         SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_Z, SSP_CHANNEL_SCAN_INDEX_Z),
  89         SSP_CHAN_TIMESTAMP(SSP_CHANNEL_SCAN_INDEX_TIME),
  90 };
  91
  92 static int ssp_process_gyro_data(struct iio_dev *indio_dev, void *buf,
  93                                  int64_t timestamp)
  94 {
  95         return ssp_common_process_data(indio_dev, buf, SSP_GYROSCOPE_SIZE,
  96                                        timestamp);
  97 }
  98
  99 static const struct iio_buffer_setup_ops ssp_gyro_buffer_ops = {
 100         .postenable = &ssp_common_buffer_postenable,
 101         .postdisable = &ssp_common_buffer_postdisable,
 102 };
 103
 104 static int ssp_gyro_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_gyro_data;
 118         spd->type = SSP_GYROSCOPE_SENSOR;
 119
 120         indio_dev->name = ssp_gyro_name;
 121         indio_dev->dev.parent = &pdev->dev;
 122         indio_dev->info = &ssp_gyro_iio_info;
 123         indio_dev->modes = INDIO_BUFFER_SOFTWARE;
 124         indio_dev->channels = ssp_gyro_channels;
 125         indio_dev->num_channels = ARRAY_SIZE(ssp_gyro_channels);
 126         indio_dev->available_scan_masks = ssp_gyro_scan_mask;
 127
 128         buffer = devm_iio_kfifo_allocate(&pdev->dev);
 129         if (!buffer)
 130                 return -ENOMEM;
 131
 132         iio_device_attach_buffer(indio_dev, buffer);
 133
 134         indio_dev->setup_ops = &ssp_gyro_buffer_ops;
 135
 136         platform_set_drvdata(pdev, indio_dev);
 137
 138         ret = devm_iio_device_register(&pdev->dev, indio_dev);
 139         if (ret < 0)
 140                 return ret;
 141
 142         /* ssp registering should be done after all iio setup */
 143         ssp_register_consumer(indio_dev, SSP_GYROSCOPE_SENSOR);
 144
 145         return 0;
 146 }
 147
 148 static struct platform_driver ssp_gyro_driver = {
 149         .driver = {
 150                 .name = SSP_GYROSCOPE_NAME,
 151         },
 152         .probe = ssp_gyro_probe,
 153 };
 154
 155 module_platform_driver(ssp_gyro_driver);
 156
 157 MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
 158 MODULE_DESCRIPTION("Samsung sensorhub gyroscopes driver");
 159 MODULE_LICENSE("GPL");