LXR linux/drivers/iio/gyro/st_gyro

   1/*
   2 * STMicroelectronics gyroscopes driver
   3 *
   4 * Copyright 2012-2013 STMicroelectronics Inc.
   5 *
   6 * Denis Ciocca <denis.ciocca@st.com>
   7 *
   8 * Licensed under the GPL-2.
   9 */
  10
  11#include <linux/module.h>
  12#include <linux/kernel.h>
  13#include <linux/slab.h>
  14#include <linux/stat.h>
  15#include <linux/interrupt.h>
  16#include <linux/i2c.h>
  17#include <linux/delay.h>
  18#include <linux/iio/iio.h>
  19#include <linux/iio/buffer.h>
  20#include <linux/iio/trigger_consumer.h>
  21#include <linux/iio/triggered_buffer.h>
  22
  23#include <linux/iio/common/st_sensors.h>
  24#include "st_gyro.h"
  25
  26int st_gyro_trig_set_state(struct iio_trigger *trig, bool state)
  27{
  28        struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
  29
  30        return st_sensors_set_dataready_irq(indio_dev, state);
  31}
  32
  33static int st_gyro_buffer_preenable(struct iio_dev *indio_dev)
  34{
  35        return st_sensors_set_enable(indio_dev, true);
  36}
  37
  38static int st_gyro_buffer_postenable(struct iio_dev *indio_dev)
  39{
  40        int err;
  41        struct st_sensor_data *gdata = iio_priv(indio_dev);
  42
  43        gdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
  44        if (gdata->buffer_data == NULL) {
  45                err = -ENOMEM;
  46                goto allocate_memory_error;
  47        }
  48
  49        err = st_sensors_set_axis_enable(indio_dev,
  50                                        (u8)indio_dev->active_scan_mask[0]);
  51        if (err < 0)
  52                goto st_gyro_buffer_postenable_error;
  53
  54        err = iio_triggered_buffer_postenable(indio_dev);
  55        if (err < 0)
  56                goto st_gyro_buffer_postenable_error;
  57
  58        return err;
  59
  60st_gyro_buffer_postenable_error:
  61        kfree(gdata->buffer_data);
  62allocate_memory_error:
  63        return err;
  64}
  65
  66static int st_gyro_buffer_predisable(struct iio_dev *indio_dev)
  67{
  68        int err;
  69        struct st_sensor_data *gdata = iio_priv(indio_dev);
  70
  71        err = iio_triggered_buffer_predisable(indio_dev);
  72        if (err < 0)
  73                goto st_gyro_buffer_predisable_error;
  74
  75        err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
  76        if (err < 0)
  77                goto st_gyro_buffer_predisable_error;
  78
  79        err = st_sensors_set_enable(indio_dev, false);
  80
  81st_gyro_buffer_predisable_error:
  82        kfree(gdata->buffer_data);
  83        return err;
  84}
  85
  86static const struct iio_buffer_setup_ops st_gyro_buffer_setup_ops = {
  87        .preenable = &st_gyro_buffer_preenable,
  88        .postenable = &st_gyro_buffer_postenable,
  89        .predisable = &st_gyro_buffer_predisable,
  90};
  91
  92int st_gyro_allocate_ring(struct iio_dev *indio_dev)
  93{
  94        return iio_triggered_buffer_setup(indio_dev, NULL,
  95                &st_sensors_trigger_handler, &st_gyro_buffer_setup_ops);
  96}
  97
  98void st_gyro_deallocate_ring(struct iio_dev *indio_dev)
  99{
 100        iio_triggered_buffer_cleanup(indio_dev);
 101}
 102
 103MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 104MODULE_DESCRIPTION("STMicroelectronics gyroscopes buffer");
 105MODULE_LICENSE("GPL v2");
 106