drivers/iio/pressure/st_pressure_buffer.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * STMicroelectronics pressures driver
   4  *
   5  * Copyright 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_pressure.h"
  24
  25 int st_press_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_press_buffer_preenable(struct iio_dev *indio_dev)
  33 {
  34         return st_sensors_set_enable(indio_dev, true);
  35 }
  36
  37 static int st_press_buffer_postenable(struct iio_dev *indio_dev)
  38 {
  39         int err;
  40         struct st_sensor_data *press_data = iio_priv(indio_dev);
  41
  42         press_data->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
  43         if (press_data->buffer_data == NULL) {
  44                 err = -ENOMEM;
  45                 goto allocate_memory_error;
  46         }
  47
  48         err = iio_triggered_buffer_postenable(indio_dev);
  49         if (err < 0)
  50                 goto st_press_buffer_postenable_error;
  51
  52         return err;
  53
  54 st_press_buffer_postenable_error:
  55         kfree(press_data->buffer_data);
  56 allocate_memory_error:
  57         return err;
  58 }
  59
  60 static int st_press_buffer_predisable(struct iio_dev *indio_dev)
  61 {
  62         int err;
  63         struct st_sensor_data *press_data = iio_priv(indio_dev);
  64
  65         err = iio_triggered_buffer_predisable(indio_dev);
  66         if (err < 0)
  67                 goto st_press_buffer_predisable_error;
  68
  69         err = st_sensors_set_enable(indio_dev, false);
  70
  71 st_press_buffer_predisable_error:
  72         kfree(press_data->buffer_data);
  73         return err;
  74 }
  75
  76 static const struct iio_buffer_setup_ops st_press_buffer_setup_ops = {
  77         .preenable = &st_press_buffer_preenable,
  78         .postenable = &st_press_buffer_postenable,
  79         .predisable = &st_press_buffer_predisable,
  80 };
  81
  82 int st_press_allocate_ring(struct iio_dev *indio_dev)
  83 {
  84         return iio_triggered_buffer_setup(indio_dev, NULL,
  85                 &st_sensors_trigger_handler, &st_press_buffer_setup_ops);
  86 }
  87
  88 void st_press_deallocate_ring(struct iio_dev *indio_dev)
  89 {
  90         iio_triggered_buffer_cleanup(indio_dev);
  91 }
  92
  93 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
  94 MODULE_DESCRIPTION("STMicroelectronics pressures buffer");
  95 MODULE_LICENSE("GPL v2");