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_preenable(struct iio_dev *indio_dev)
  33{
  34        return st_sensors_set_enable(indio_dev, true);
  35}
  36
  37static int st_gyro_buffer_postenable(struct iio_dev *indio_dev)
  38{
  39        int err;
  40        struct st_sensor_data *gdata = iio_priv(indio_dev);
  41
  42        gdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
  43        if (gdata->buffer_data == NULL) {
  44                err = -ENOMEM;
  45                goto allocate_memory_error;
  46        }
  47
  48        err = st_sensors_set_axis_enable(indio_dev,
  49                                        (u8)indio_dev->active_scan_mask[0]);
  50        if (err < 0)
  51                goto st_gyro_buffer_postenable_error;
  52
  53        err = iio_triggered_buffer_postenable(indio_dev);
  54        if (err < 0)
  55                goto st_gyro_buffer_postenable_error;
  56
  57        return err;
  58
  59st_gyro_buffer_postenable_error:
  60        kfree(gdata->buffer_data);
  61allocate_memory_error:
  62        return err;
  63}
  64
  65static int st_gyro_buffer_predisable(struct iio_dev *indio_dev)
  66{
  67        int err;
  68        struct st_sensor_data *gdata = iio_priv(indio_dev);
  69
  70        err = iio_triggered_buffer_predisable(indio_dev);
  71        if (err < 0)
  72                goto st_gyro_buffer_predisable_error;
  73
  74        err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
  75        if (err < 0)
  76                goto st_gyro_buffer_predisable_error;
  77
  78        err = st_sensors_set_enable(indio_dev, false);
  79
  80st_gyro_buffer_predisable_error:
  81        kfree(gdata->buffer_data);
  82        return err;
  83}
  84
  85static const struct iio_buffer_setup_ops st_gyro_buffer_setup_ops = {
  86        .preenable = &st_gyro_buffer_preenable,
  87        .postenable = &st_gyro_buffer_postenable,
  88        .predisable = &st_gyro_buffer_predisable,
  89};
  90
  91int st_gyro_allocate_ring(struct iio_dev *indio_dev)
  92{
  93        return iio_triggered_buffer_setup(indio_dev, NULL,
  94                &st_sensors_trigger_handler, &st_gyro_buffer_setup_ops);
  95}
  96
  97void st_gyro_deallocate_ring(struct iio_dev *indio_dev)
  98{
  99        iio_triggered_buffer_cleanup(indio_dev);
 100}
 101
 102MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 103MODULE_DESCRIPTION("STMicroelectronics gyroscopes buffer");
 104MODULE_LICENSE("GPL v2");
 105