LXR linux/drivers/iio/magnetometer/st_magn

   1/*
   2 * STMicroelectronics magnetometers 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_magn.h"
  25
  26int st_magn_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_magn_buffer_postenable(struct iio_dev *indio_dev)
  34{
  35        int err;
  36        struct st_sensor_data *mdata = iio_priv(indio_dev);
  37
  38        mdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
  39        if (mdata->buffer_data == NULL) {
  40                err = -ENOMEM;
  41                goto allocate_memory_error;
  42        }
  43
  44        err = iio_triggered_buffer_postenable(indio_dev);
  45        if (err < 0)
  46                goto st_magn_buffer_postenable_error;
  47
  48        return st_sensors_set_enable(indio_dev, true);
  49
  50st_magn_buffer_postenable_error:
  51        kfree(mdata->buffer_data);
  52allocate_memory_error:
  53        return err;
  54}
  55
  56static int st_magn_buffer_predisable(struct iio_dev *indio_dev)
  57{
  58        int err;
  59        struct st_sensor_data *mdata = iio_priv(indio_dev);
  60
  61        err = st_sensors_set_enable(indio_dev, false);
  62        if (err < 0)
  63                goto st_magn_buffer_predisable_error;
  64
  65        err = iio_triggered_buffer_predisable(indio_dev);
  66
  67st_magn_buffer_predisable_error:
  68        kfree(mdata->buffer_data);
  69        return err;
  70}
  71
  72static const struct iio_buffer_setup_ops st_magn_buffer_setup_ops = {
  73        .postenable = &st_magn_buffer_postenable,
  74        .predisable = &st_magn_buffer_predisable,
  75};
  76
  77int st_magn_allocate_ring(struct iio_dev *indio_dev)
  78{
  79        return iio_triggered_buffer_setup(indio_dev, NULL,
  80                &st_sensors_trigger_handler, &st_magn_buffer_setup_ops);
  81}
  82
  83void st_magn_deallocate_ring(struct iio_dev *indio_dev)
  84{
  85        iio_triggered_buffer_cleanup(indio_dev);
  86}
  87
  88MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
  89MODULE_DESCRIPTION("STMicroelectronics magnetometers buffer");
  90MODULE_LICENSE("GPL v2");
  91