LXR linux/drivers/iio/gyro/st_gyro

   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/module.h>
  11#include <linux/kernel.h>
  12#include <linux/slab.h>
  13#include <linux/stat.h>
  14#include <linux/interrupt.h>
  15#include <linux/i2c.h>
  16#include <linux/delay.h>
  17#include <linux/iio/iio.h>
  18#include <linux/iio/buffer.h>
  19#include <linux/iio/trigger_consumer.h>
  20#include <linux/iio/triggered_buffer.h>
  21
  22#include <linux/iio/common/st_sensors.h>
  23#include "st_gyro.h"
  24
  25int st_gyro_trig_set_state(struct iio_trigger *trig, bool state)
  26{
  27        struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
  28
  29        return st_sensors_set_dataready_irq(indio_dev, state);
  30}
  31
  32static int st_gyro_buffer_postenable(struct iio_dev *indio_dev)
  33{
  34        int err;
  35
  36        err = iio_triggered_buffer_postenable(indio_dev);
  37        if (err < 0)
  38                return err;
  39
  40        err = st_sensors_set_axis_enable(indio_dev,
  41                                         (u8)indio_dev->active_scan_mask[0]);
  42        if (err < 0)
  43                goto st_gyro_buffer_predisable;
  44
  45        err = st_sensors_set_enable(indio_dev, true);
  46        if (err < 0)
  47                goto st_gyro_buffer_enable_all_axis;
  48
  49        return 0;
  50
  51st_gyro_buffer_enable_all_axis:
  52        st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
  53st_gyro_buffer_predisable:
  54        iio_triggered_buffer_predisable(indio_dev);
  55        return err;
  56}
  57
  58static int st_gyro_buffer_predisable(struct iio_dev *indio_dev)
  59{
  60        int err, err2;
  61
  62        err = st_sensors_set_enable(indio_dev, false);
  63        if (err < 0)
  64                goto st_gyro_buffer_predisable;
  65
  66        err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
  67
  68st_gyro_buffer_predisable:
  69        err2 = iio_triggered_buffer_predisable(indio_dev);
  70        if (!err)
  71                err = err2;
  72
  73        return err;
  74}
  75
  76static const struct iio_buffer_setup_ops st_gyro_buffer_setup_ops = {
  77        .postenable = &st_gyro_buffer_postenable,
  78        .predisable = &st_gyro_buffer_predisable,
  79};
  80
  81int st_gyro_allocate_ring(struct iio_dev *indio_dev)
  82{
  83        return iio_triggered_buffer_setup(indio_dev, NULL,
  84                &st_sensors_trigger_handler, &st_gyro_buffer_setup_ops);
  85}
  86
  87void st_gyro_deallocate_ring(struct iio_dev *indio_dev)
  88{
  89        iio_triggered_buffer_cleanup(indio_dev);
  90}
  91
  92MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
  93MODULE_DESCRIPTION("STMicroelectronics gyroscopes buffer");
  94MODULE_LICENSE("GPL v2");
  95