drivers/iio/common/ssp_sensors/ssp_iio.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
   4  */
   5
   6 #include <linux/iio/common/ssp_sensors.h>
   7 #include <linux/iio/buffer.h>
   8 #include <linux/iio/kfifo_buf.h>
   9 #include <linux/module.h>
  10 #include <linux/slab.h>
  11 #include "ssp_iio_sensor.h"
  12
  13 /**
  14  * ssp_common_buffer_postenable() - generic postenable callback for ssp buffer
  15  *
  16  * @indio_dev:          iio device
  17  *
  18  * Returns 0 or negative value in case of error
  19  */
  20 int ssp_common_buffer_postenable(struct iio_dev *indio_dev)
  21 {
  22         struct ssp_sensor_data *spd = iio_priv(indio_dev);
  23         struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
  24
  25         /* the allocation is made in post because scan size is known in this
  26          * moment
  27          * */
  28         spd->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL | GFP_DMA);
  29         if (!spd->buffer)
  30                 return -ENOMEM;
  31
  32         return ssp_enable_sensor(data, spd->type,
  33                                  ssp_get_sensor_delay(data, spd->type));
  34 }
  35 EXPORT_SYMBOL_NS(ssp_common_buffer_postenable, "IIO_SSP_SENSORS");
  36
  37 /**
  38  * ssp_common_buffer_postdisable() - generic postdisable callback for ssp buffer
  39  *
  40  * @indio_dev:          iio device
  41  *
  42  * Returns 0 or negative value in case of error
  43  */
  44 int ssp_common_buffer_postdisable(struct iio_dev *indio_dev)
  45 {
  46         int ret;
  47         struct ssp_sensor_data *spd = iio_priv(indio_dev);
  48         struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
  49
  50         ret = ssp_disable_sensor(data, spd->type);
  51         if (ret < 0)
  52                 return ret;
  53
  54         kfree(spd->buffer);
  55
  56         return ret;
  57 }
  58 EXPORT_SYMBOL_NS(ssp_common_buffer_postdisable, "IIO_SSP_SENSORS");
  59
  60 /**
  61  * ssp_common_process_data() - Common process data callback for ssp sensors
  62  *
  63  * @indio_dev:          iio device
  64  * @buf:                source buffer
  65  * @len:                sensor data length
  66  * @timestamp:          system timestamp
  67  *
  68  * Returns 0 or negative value in case of error
  69  */
  70 int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
  71                             unsigned int len, int64_t timestamp)
  72 {
  73         __le32 time;
  74         int64_t calculated_time = 0;
  75         struct ssp_sensor_data *spd = iio_priv(indio_dev);
  76
  77         if (indio_dev->scan_bytes == 0)
  78                 return 0;
  79
  80         /*
  81          * it always sends full set of samples, remember about available masks
  82          */
  83         memcpy(spd->buffer, buf, len);
  84
  85         if (indio_dev->scan_timestamp) {
  86                 memcpy(&time, &((char *)buf)[len], SSP_TIME_SIZE);
  87                 calculated_time =
  88                         timestamp + (int64_t)le32_to_cpu(time) * 1000000;
  89         }
  90
  91         return iio_push_to_buffers_with_timestamp(indio_dev, spd->buffer,
  92                                                   calculated_time);
  93 }
  94 EXPORT_SYMBOL_NS(ssp_common_process_data, "IIO_SSP_SENSORS");
  95
  96 MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>");
  97 MODULE_DESCRIPTION("Samsung sensorhub commons");
  98 MODULE_LICENSE("GPL");
  99 MODULE_IMPORT_NS("IIO_SSP_SENSORS");