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This patch adds a generic pressure driver for STMicroelectronics pressure sensors, currently it supports: LPS331AP. Signed-off-by: Denis Ciocca <denis.ciocca@st.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
/*
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* STMicroelectronics pressures driver
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*
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* Copyright 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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* Licensed under the GPL-2.
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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_pressure.h"
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int st_press_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_press_buffer_preenable(struct iio_dev *indio_dev)
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{
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int 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_press_set_enable_error;
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err = iio_sw_buffer_preenable(indio_dev);
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st_press_set_enable_error:
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return err;
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}
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static int st_press_buffer_postenable(struct iio_dev *indio_dev)
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{
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int err;
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struct st_sensor_data *pdata = iio_priv(indio_dev);
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pdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
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if (pdata->buffer_data == NULL) {
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err = -ENOMEM;
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goto allocate_memory_error;
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}
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err = iio_triggered_buffer_postenable(indio_dev);
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if (err < 0)
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goto st_press_buffer_postenable_error;
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return err;
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st_press_buffer_postenable_error:
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kfree(pdata->buffer_data);
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allocate_memory_error:
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return err;
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}
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static int st_press_buffer_predisable(struct iio_dev *indio_dev)
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{
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int err;
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struct st_sensor_data *pdata = iio_priv(indio_dev);
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err = iio_triggered_buffer_predisable(indio_dev);
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if (err < 0)
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goto st_press_buffer_predisable_error;
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err = st_sensors_set_enable(indio_dev, false);
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st_press_buffer_predisable_error:
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kfree(pdata->buffer_data);
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return err;
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}
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static const struct iio_buffer_setup_ops st_press_buffer_setup_ops = {
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.preenable = &st_press_buffer_preenable,
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.postenable = &st_press_buffer_postenable,
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.predisable = &st_press_buffer_predisable,
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};
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int st_press_allocate_ring(struct iio_dev *indio_dev)
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{
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return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
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&st_sensors_trigger_handler, &st_press_buffer_setup_ops);
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}
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void st_press_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 pressures buffer");
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MODULE_LICENSE("GPL v2");
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