drivers/iio/gyro/st_gyro_buffer.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * STMicroelectronics gyroscopes driver
   4  *
   5  * Copyright 2012-2013 STMicroelectronics Inc.
   6  *
   7  * Denis Ciocca <denis.ciocca@st.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/iio/iio.h>
  12 #include <linux/iio/buffer.h>
  13 #include <linux/iio/trigger.h>
  14 #include <linux/iio/triggered_buffer.h>
  15
  16 #include <linux/iio/common/st_sensors.h>
  17 #include "st_gyro.h"
  18
  19 int st_gyro_trig_set_state(struct iio_trigger *trig, bool state)
  20 {
  21         struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
  22
  23         return st_sensors_set_dataready_irq(indio_dev, state);
  24 }
  25
  26 static int st_gyro_buffer_postenable(struct iio_dev *indio_dev)
  27 {
  28         int err;
  29
  30         err = st_sensors_set_axis_enable(indio_dev, indio_dev->active_scan_mask[0]);
  31         if (err < 0)
  32                 return err;
  33
  34         err = st_sensors_set_enable(indio_dev, true);
  35         if (err < 0)
  36                 goto st_gyro_buffer_enable_all_axis;
  37
  38         return 0;
  39
  40 st_gyro_buffer_enable_all_axis:
  41         st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
  42         return err;
  43 }
  44
  45 static int st_gyro_buffer_predisable(struct iio_dev *indio_dev)
  46 {
  47         int err;
  48
  49         err = st_sensors_set_enable(indio_dev, false);
  50         if (err < 0)
  51                 return err;
  52
  53         return st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
  54 }
  55
  56 static const struct iio_buffer_setup_ops st_gyro_buffer_setup_ops = {
  57         .postenable = &st_gyro_buffer_postenable,
  58         .predisable = &st_gyro_buffer_predisable,
  59 };
  60
  61 int st_gyro_allocate_ring(struct iio_dev *indio_dev)
  62 {
  63         return devm_iio_triggered_buffer_setup(indio_dev->dev.parent, indio_dev,
  64                 NULL, &st_sensors_trigger_handler, &st_gyro_buffer_setup_ops);
  65 }
  66