drivers/iio/accel/st_accel_buffer.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * STMicroelectronics accelerometers 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_accel.h"
  24
  25 int st_accel_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_accel_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_axis_enable(indio_dev,
  41                                          (u8)indio_dev->active_scan_mask[0]);
  42         if (err < 0)
  43                 goto st_accel_buffer_predisable;
  44
  45         err = st_sensors_set_enable(indio_dev, true);
  46         if (err < 0)
  47                 goto st_accel_buffer_enable_all_axis;
  48
  49         return 0;
  50
  51 st_accel_buffer_enable_all_axis:
  52         st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
  53 st_accel_buffer_predisable:
  54         iio_triggered_buffer_predisable(indio_dev);
  55         return err;
  56 }
  57
  58 static int st_accel_buffer_predisable(struct iio_dev *indio_dev)
  59 {
  60         int err, err2;
  61
  62         err = st_sensors_set_enable(indio_dev, false);
  63         if (err < 0)
  64                 goto st_accel_buffer_predisable;
  65
  66         err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
  67
  68 st_accel_buffer_predisable:
  69         err2 = iio_triggered_buffer_predisable(indio_dev);
  70         if (!err)
  71                 err = err2;
  72
  73         return err;
  74 }
  75
  76 static const struct iio_buffer_setup_ops st_accel_buffer_setup_ops = {
  77         .postenable = &st_accel_buffer_postenable,
  78         .predisable = &st_accel_buffer_predisable,
  79 };
  80
  81 int st_accel_allocate_ring(struct iio_dev *indio_dev)
  82 {
  83         return iio_triggered_buffer_setup(indio_dev, NULL,
  84                 &st_sensors_trigger_handler, &st_accel_buffer_setup_ops);
  85 }
  86
  87 void st_accel_deallocate_ring(struct iio_dev *indio_dev)
  88 {
  89         iio_triggered_buffer_cleanup(indio_dev);
  90 }
  91
  92 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
  93 MODULE_DESCRIPTION("STMicroelectronics accelerometers buffer");
  94 MODULE_LICENSE("GPL v2");