root/drivers/iio/magnetometer/st_magn_buffer.c

DEFINITIONS

1. st_magn_trig_set_state
2. st_magn_buffer_postenable
3. st_magn_buffer_predisable
4. st_magn_allocate_ring
5. st_magn_deallocate_ring

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * STMicroelectronics magnetometers 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_magn.h"
  24 
  25 int st_magn_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 
  32 static int st_magn_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_enable(indio_dev, true);
  41         if (err < 0)
  42                 goto st_magn_buffer_predisable;
  43 
  44         return 0;
  45 
  46 st_magn_buffer_predisable:
  47         iio_triggered_buffer_predisable(indio_dev);
  48         return err;
  49 }
  50 
  51 static int st_magn_buffer_predisable(struct iio_dev *indio_dev)
  52 {
  53         int err, err2;
  54 
  55         err = st_sensors_set_enable(indio_dev, false);
  56 
  57         err2 = iio_triggered_buffer_predisable(indio_dev);
  58         if (!err)
  59                 err = err2;
  60 
  61         return err;
  62 }
  63 
  64 static const struct iio_buffer_setup_ops st_magn_buffer_setup_ops = {
  65         .postenable = &st_magn_buffer_postenable,
  66         .predisable = &st_magn_buffer_predisable,
  67 };
  68 
  69 int st_magn_allocate_ring(struct iio_dev *indio_dev)
  70 {
  71         return iio_triggered_buffer_setup(indio_dev, NULL,
  72                 &st_sensors_trigger_handler, &st_magn_buffer_setup_ops);
  73 }
  74 
  75 void st_magn_deallocate_ring(struct iio_dev *indio_dev)
  76 {
  77         iio_triggered_buffer_cleanup(indio_dev);
  78 }
  79 
  80 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
  81 MODULE_DESCRIPTION("STMicroelectronics magnetometers buffer");
  82 MODULE_LICENSE("GPL v2");