140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
/*
|
|
* Copyright (C) 2008 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.
|
|
*
|
|
* max1363_ring.c
|
|
*/
|
|
|
|
#include <linux/interrupt.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/bitops.h>
|
|
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/iio/buffer.h>
|
|
#include "../ring_sw.h"
|
|
#include <linux/iio/trigger_consumer.h>
|
|
|
|
#include "max1363.h"
|
|
|
|
int max1363_update_scan_mode(struct iio_dev *indio_dev,
|
|
const unsigned long *scan_mask)
|
|
{
|
|
struct max1363_state *st = iio_priv(indio_dev);
|
|
|
|
/*
|
|
* Need to figure out the current mode based upon the requested
|
|
* scan mask in iio_dev
|
|
*/
|
|
st->current_mode = max1363_match_mode(scan_mask, st->chip_info);
|
|
if (!st->current_mode)
|
|
return -EINVAL;
|
|
max1363_set_scan_mode(st);
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t max1363_trigger_handler(int irq, void *p)
|
|
{
|
|
struct iio_poll_func *pf = p;
|
|
struct iio_dev *indio_dev = pf->indio_dev;
|
|
struct max1363_state *st = iio_priv(indio_dev);
|
|
s64 time_ns;
|
|
__u8 *rxbuf;
|
|
int b_sent;
|
|
size_t d_size;
|
|
unsigned long numvals = bitmap_weight(st->current_mode->modemask,
|
|
MAX1363_MAX_CHANNELS);
|
|
|
|
/* Ensure the timestamp is 8 byte aligned */
|
|
if (st->chip_info->bits != 8)
|
|
d_size = numvals*2;
|
|
else
|
|
d_size = numvals;
|
|
if (indio_dev->scan_timestamp) {
|
|
d_size += sizeof(s64);
|
|
if (d_size % sizeof(s64))
|
|
d_size += sizeof(s64) - (d_size % sizeof(s64));
|
|
}
|
|
/* Monitor mode prevents reading. Whilst not currently implemented
|
|
* might as well have this test in here in the meantime as it does
|
|
* no harm.
|
|
*/
|
|
if (numvals == 0)
|
|
goto done;
|
|
|
|
rxbuf = kmalloc(d_size, GFP_KERNEL);
|
|
if (rxbuf == NULL)
|
|
goto done;
|
|
if (st->chip_info->bits != 8)
|
|
b_sent = i2c_master_recv(st->client, rxbuf, numvals*2);
|
|
else
|
|
b_sent = i2c_master_recv(st->client, rxbuf, numvals);
|
|
if (b_sent < 0)
|
|
goto done_free;
|
|
|
|
time_ns = iio_get_time_ns();
|
|
|
|
if (indio_dev->scan_timestamp)
|
|
memcpy(rxbuf + d_size - sizeof(s64), &time_ns, sizeof(time_ns));
|
|
iio_push_to_buffer(indio_dev->buffer, rxbuf, time_ns);
|
|
|
|
done_free:
|
|
kfree(rxbuf);
|
|
done:
|
|
iio_trigger_notify_done(indio_dev->trig);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static const struct iio_buffer_setup_ops max1363_ring_setup_ops = {
|
|
.postenable = &iio_triggered_buffer_postenable,
|
|
.preenable = &iio_sw_buffer_preenable,
|
|
.predisable = &iio_triggered_buffer_predisable,
|
|
};
|
|
|
|
int max1363_register_ring_funcs_and_init(struct iio_dev *indio_dev)
|
|
{
|
|
struct max1363_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,
|
|
&max1363_trigger_handler,
|
|
IRQF_ONESHOT,
|
|
indio_dev,
|
|
"%s_consumer%d",
|
|
st->client->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 = &max1363_ring_setup_ops;
|
|
|
|
/* 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 max1363_ring_cleanup(struct iio_dev *indio_dev)
|
|
{
|
|
/* ensure that the trigger has been detached */
|
|
iio_dealloc_pollfunc(indio_dev->pollfunc);
|
|
iio_sw_rb_free(indio_dev->buffer);
|
|
}
|