forked from Minki/linux
e031d5f558
This patch is removing the buffer allocation at each buffer enable. We just allocate enough memory in the main structure during probe to cover maximum size needed (that anyway is pretty small) [16bytes]. Signed-off-by: Denis Ciocca <denis.ciocca@st.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* STMicroelectronics magnetometers driver
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*
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* Copyright 2012-2013 STMicroelectronics Inc.
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*
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* Denis Ciocca <denis.ciocca@st.com>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/delay.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/common/st_sensors.h>
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#include "st_magn.h"
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int st_magn_trig_set_state(struct iio_trigger *trig, bool state)
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{
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struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
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return st_sensors_set_dataready_irq(indio_dev, state);
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}
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static int st_magn_buffer_postenable(struct iio_dev *indio_dev)
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{
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int err;
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err = iio_triggered_buffer_postenable(indio_dev);
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if (err < 0)
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return err;
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err = st_sensors_set_enable(indio_dev, true);
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if (err < 0)
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goto st_magn_buffer_predisable;
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return 0;
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st_magn_buffer_predisable:
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iio_triggered_buffer_predisable(indio_dev);
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return err;
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}
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static int st_magn_buffer_predisable(struct iio_dev *indio_dev)
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{
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int err, err2;
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err = st_sensors_set_enable(indio_dev, false);
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err2 = iio_triggered_buffer_predisable(indio_dev);
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if (!err)
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err = err2;
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return err;
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}
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static const struct iio_buffer_setup_ops st_magn_buffer_setup_ops = {
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.postenable = &st_magn_buffer_postenable,
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.predisable = &st_magn_buffer_predisable,
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};
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int st_magn_allocate_ring(struct iio_dev *indio_dev)
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{
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return iio_triggered_buffer_setup(indio_dev, NULL,
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&st_sensors_trigger_handler, &st_magn_buffer_setup_ops);
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}
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void st_magn_deallocate_ring(struct iio_dev *indio_dev)
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{
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iio_triggered_buffer_cleanup(indio_dev);
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}
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MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics magnetometers buffer");
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MODULE_LICENSE("GPL v2");
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