LXR linux/drivers/iio/pressure/st_pressure

   1/*
   2 * STMicroelectronics pressures driver
   3 *
   4 * Copyright 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_pressure.h"
  25
  26int st_press_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_press_buffer_preenable(struct iio_dev *indio_dev)
  34{
  35        return st_sensors_set_enable(indio_dev, true);
  36}
  37
  38static int st_press_buffer_postenable(struct iio_dev *indio_dev)
  39{
  40        int err;
  41        struct st_sensor_data *press_data = iio_priv(indio_dev);
  42
  43        press_data->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
  44        if (press_data->buffer_data == NULL) {
  45                err = -ENOMEM;
  46                goto allocate_memory_error;
  47        }
  48
  49        err = iio_triggered_buffer_postenable(indio_dev);
  50        if (err < 0)
  51                goto st_press_buffer_postenable_error;
  52
  53        return err;
  54
  55st_press_buffer_postenable_error:
  56        kfree(press_data->buffer_data);
  57allocate_memory_error:
  58        return err;
  59}
  60
  61static int st_press_buffer_predisable(struct iio_dev *indio_dev)
  62{
  63        int err;
  64        struct st_sensor_data *press_data = iio_priv(indio_dev);
  65
  66        err = iio_triggered_buffer_predisable(indio_dev);
  67        if (err < 0)
  68                goto st_press_buffer_predisable_error;
  69
  70        err = st_sensors_set_enable(indio_dev, false);
  71
  72st_press_buffer_predisable_error:
  73        kfree(press_data->buffer_data);
  74        return err;
  75}
  76
  77static const struct iio_buffer_setup_ops st_press_buffer_setup_ops = {
  78        .preenable = &st_press_buffer_preenable,
  79        .postenable = &st_press_buffer_postenable,
  80        .predisable = &st_press_buffer_predisable,
  81};
  82
  83int st_press_allocate_ring(struct iio_dev *indio_dev)
  84{
  85        return iio_triggered_buffer_setup(indio_dev, NULL,
  86                &st_sensors_trigger_handler, &st_press_buffer_setup_ops);
  87}
  88
  89void st_press_deallocate_ring(struct iio_dev *indio_dev)
  90{
  91        iio_triggered_buffer_cleanup(indio_dev);
  92}
  93
  94MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
  95MODULE_DESCRIPTION("STMicroelectronics pressures buffer");
  96MODULE_LICENSE("GPL v2");
  97