drivers/iio/gyro/st_gyro_buffer.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * STMicroelectronics gyroscopes 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_gyro.h"
  24
  25 int st_gyro_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_gyro_buffer_postenable(struct iio_dev *indio_dev)
  33 {
  34         int err;
  35
  36         err = st_sensors_set_axis_enable(indio_dev, indio_dev->active_scan_mask[0]);
  37         if (err < 0)
  38                 return err;
  39
  40         err = st_sensors_set_enable(indio_dev, true);
  41         if (err < 0)
  42                 goto st_gyro_buffer_enable_all_axis;
  43
  44         return 0;
  45
  46 st_gyro_buffer_enable_all_axis:
  47         st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
  48         return err;
  49 }
  50
  51 static int st_gyro_buffer_predisable(struct iio_dev *indio_dev)
  52 {
  53         int err;
  54
  55         err = st_sensors_set_enable(indio_dev, false);
  56         if (err < 0)
  57                 return err;
  58
  59         return st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
  60 }
  61
  62 static const struct iio_buffer_setup_ops st_gyro_buffer_setup_ops = {
  63         .postenable = &st_gyro_buffer_postenable,
  64         .predisable = &st_gyro_buffer_predisable,
  65 };
  66
  67 int st_gyro_allocate_ring(struct iio_dev *indio_dev)
  68 {
  69         return iio_triggered_buffer_setup(indio_dev, NULL,
  70                 &st_sensors_trigger_handler, &st_gyro_buffer_setup_ops);
  71 }
  72
  73 void st_gyro_deallocate_ring(struct iio_dev *indio_dev)
  74 {
  75         iio_triggered_buffer_cleanup(indio_dev);
  76 }
  77
  78 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
  79 MODULE_DESCRIPTION("STMicroelectronics gyroscopes buffer");
  80 MODULE_LICENSE("GPL v2");