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/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"
  27 static const char ssp_gyro_name[] = SSP_GYROSCOPE_NAME;
  28
  29 enum 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
  36 static 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
  55 static 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
  77 static struct iio_info ssp_gyro_iio_info = {
  78         .read_raw = &ssp_gyro_read_raw,
  79         .write_raw = &ssp_gyro_write_raw,
  80 };
  81
  82 static const unsigned long ssp_gyro_scan_mask[] = { 0x07, 0, };
  83
  84 static 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
  91 static 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
  98 static const struct iio_buffer_setup_ops ssp_gyro_buffer_ops = {
  99         .postenable = &ssp_common_buffer_postenable,
 100         .postdisable = &ssp_common_buffer_postdisable,
 101 };
 102
 103 static 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
 147 static 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
 156 static 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
 164 module_platform_driver(ssp_gyro_driver);
 165
 166 MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
 167 MODULE_DESCRIPTION("Samsung sensorhub gyroscopes driver");
 168 MODULE_LICENSE("GPL");