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/*
* Copyright 2010 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 "../iio.h"
#include "../buffer.h"
#include "../ring_sw.h"
#include "../trigger_consumer.h"
#include "ad7476.h"
/**
* ad7476_ring_preenable() setup the parameters of the ring before enabling
*
* The complex nature of the setting of the number of bytes per datum is due
* to this driver currently ensuring that the timestamp is stored at an 8
* byte boundary.
**/
static int ad7476_ring_preenable(struct iio_dev *indio_dev)
{
struct ad7476_state *st = iio_priv(indio_dev);
struct iio_buffer *ring = indio_dev->buffer;
st->d_size = bitmap_weight(indio_dev->active_scan_mask,
indio_dev->masklength) *
st->chip_info->channel[0].scan_type.storagebits / 8;
if (ring->scan_timestamp) {
st->d_size += sizeof(s64);
if (st->d_size % sizeof(s64))
st->d_size += sizeof(s64) - (st->d_size % sizeof(s64));
}
if (indio_dev->buffer->access->set_bytes_per_datum)
indio_dev->buffer->access->
set_bytes_per_datum(indio_dev->buffer, st->d_size);
return 0;
}
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(st->d_size, GFP_KERNEL);
if (rxbuf == NULL)
return -ENOMEM;
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->buffer->scan_timestamp)
memcpy(rxbuf + st->d_size - 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;
}
static const struct iio_buffer_setup_ops ad7476_ring_setup_ops = {
.preenable = &ad7476_ring_preenable,
.postenable = &iio_triggered_buffer_postenable,
.predisable = &iio_triggered_buffer_predisable,
};
int ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev)
{
struct ad7476_state *st = iio_priv(indio_dev);
int ret = 0;
indio_dev->buffer = iio_sw_rb_allocate(indio_dev);
if (!indio_dev->buffer) {
ret = -ENOMEM;
goto error_ret;
}
indio_dev->pollfunc
= iio_alloc_pollfunc(NULL,
&ad7476_trigger_handler,
IRQF_ONESHOT,
indio_dev,
"%s_consumer%d",
spi_get_device_id(st->spi)->name,
indio_dev->id);
if (indio_dev->pollfunc == NULL) {
ret = -ENOMEM;
goto error_deallocate_sw_rb;
}
/* Ring buffer functions - here trigger setup related */
indio_dev->setup_ops = &ad7476_ring_setup_ops;
indio_dev->buffer->scan_timestamp = true;
/* Flag that polled ring buffering is possible */
indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
return 0;
error_deallocate_sw_rb:
iio_sw_rb_free(indio_dev->buffer);
error_ret:
return ret;
}
void ad7476_ring_cleanup(struct iio_dev *indio_dev)
{
iio_dealloc_pollfunc(indio_dev->pollfunc);
iio_sw_rb_free(indio_dev->buffer);
}
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