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/*
* Copyright (C) 2010-2012 Michael Hennerich, Analog Devices Inc.
* Copyright (C) 2008-2010 Jonathan Cameron
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* ad799x_ring.c
*/
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/i2c.h>
#include <linux/bitops.h>
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include "ad799x.h"
/**
* ad799x_trigger_handler() bh of trigger launched polling to ring buffer
*
* Currently there is no option in this driver to disable the saving of
* timestamps within the ring.
**/
static irqreturn_t ad799x_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct ad799x_state *st = iio_priv(indio_dev);
struct iio_buffer *ring = indio_dev->buffer;
s64 time_ns;
__u8 *rxbuf;
int b_sent;
u8 cmd;
rxbuf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
if (rxbuf == NULL)
goto out;
switch (st->id) {
case ad7991:
case ad7995:
case ad7999:
cmd = st->config |
(*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
break;
case ad7992:
case ad7993:
case ad7994:
cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
AD7998_CONV_RES_REG;
break;
case ad7997:
case ad7998:
cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
break;
default:
cmd = 0;
}
b_sent = i2c_smbus_read_i2c_block_data(st->client,
cmd, bitmap_weight(indio_dev->active_scan_mask,
indio_dev->masklength) * 2, rxbuf);
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));
ring->access->store_to(indio_dev->buffer, rxbuf, time_ns);
done:
kfree(rxbuf);
out:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev)
{
return iio_triggered_buffer_setup(indio_dev, NULL,
&ad799x_trigger_handler, NULL);
}
void ad799x_ring_cleanup(struct iio_dev *indio_dev)
{
iio_triggered_buffer_cleanup(indio_dev);
}
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