65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/*
|
|
* Copyright 2010-2012 Analog Devices Inc.
|
|
* Copyright (C) 2008 Jonathan Cameron
|
|
*
|
|
* Licensed under the GPL-2 or later.
|
|
*
|
|
* ad7476_ring.c
|
|
*/
|
|
|
|
#include <linux/interrupt.h>
|
|
#include <linux/device.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spi/spi.h>
|
|
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/iio/buffer.h>
|
|
#include <linux/iio/trigger_consumer.h>
|
|
#include <linux/iio/triggered_buffer.h>
|
|
|
|
#include "ad7476.h"
|
|
|
|
static irqreturn_t ad7476_trigger_handler(int irq, void *p)
|
|
{
|
|
struct iio_poll_func *pf = p;
|
|
struct iio_dev *indio_dev = pf->indio_dev;
|
|
struct ad7476_state *st = iio_priv(indio_dev);
|
|
s64 time_ns;
|
|
__u8 *rxbuf;
|
|
int b_sent;
|
|
|
|
rxbuf = kzalloc(indio_dev->scan_bytes, GFP_KERNEL);
|
|
if (rxbuf == NULL)
|
|
goto done;
|
|
|
|
b_sent = spi_read(st->spi, rxbuf,
|
|
st->chip_info->channel[0].scan_type.storagebits / 8);
|
|
if (b_sent < 0)
|
|
goto done;
|
|
|
|
time_ns = iio_get_time_ns();
|
|
|
|
if (indio_dev->scan_timestamp)
|
|
memcpy(rxbuf + indio_dev->scan_bytes - sizeof(s64),
|
|
&time_ns, sizeof(time_ns));
|
|
|
|
indio_dev->buffer->access->store_to(indio_dev->buffer, rxbuf, time_ns);
|
|
done:
|
|
iio_trigger_notify_done(indio_dev->trig);
|
|
kfree(rxbuf);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
int ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev)
|
|
{
|
|
return iio_triggered_buffer_setup(indio_dev, NULL,
|
|
&ad7476_trigger_handler, NULL);
|
|
}
|
|
|
|
void ad7476_ring_cleanup(struct iio_dev *indio_dev)
|
|
{
|
|
iio_triggered_buffer_cleanup(indio_dev);
|
|
}
|