forked from Minki/linux
d046ba268a
The adis16448, unlike the other chips in this family, in addition to the
hardware channels also sends out the DIAG_STAT register in burst mode
before them. Handle that case by skipping over the first 2 bytes before we
pass the received data to the buffer.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Fixes: 76ada52f7f ("iio:adis16400: Add support for the adis16448")
Cc: <stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
#include <linux/interrupt.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/spi/spi.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/export.h>
|
|
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/iio/buffer.h>
|
|
#include <linux/iio/triggered_buffer.h>
|
|
#include <linux/iio/trigger_consumer.h>
|
|
|
|
#include "adis16400.h"
|
|
|
|
int adis16400_update_scan_mode(struct iio_dev *indio_dev,
|
|
const unsigned long *scan_mask)
|
|
{
|
|
struct adis16400_state *st = iio_priv(indio_dev);
|
|
struct adis *adis = &st->adis;
|
|
unsigned int burst_length;
|
|
u8 *tx;
|
|
|
|
if (st->variant->flags & ADIS16400_NO_BURST)
|
|
return adis_update_scan_mode(indio_dev, scan_mask);
|
|
|
|
kfree(adis->xfer);
|
|
kfree(adis->buffer);
|
|
|
|
/* All but the timestamp channel */
|
|
burst_length = (indio_dev->num_channels - 1) * sizeof(u16);
|
|
if (st->variant->flags & ADIS16400_BURST_DIAG_STAT)
|
|
burst_length += sizeof(u16);
|
|
|
|
adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL);
|
|
if (!adis->xfer)
|
|
return -ENOMEM;
|
|
|
|
adis->buffer = kzalloc(burst_length + sizeof(u16), GFP_KERNEL);
|
|
if (!adis->buffer)
|
|
return -ENOMEM;
|
|
|
|
tx = adis->buffer + burst_length;
|
|
tx[0] = ADIS_READ_REG(ADIS16400_GLOB_CMD);
|
|
tx[1] = 0;
|
|
|
|
adis->xfer[0].tx_buf = tx;
|
|
adis->xfer[0].bits_per_word = 8;
|
|
adis->xfer[0].len = 2;
|
|
adis->xfer[1].rx_buf = adis->buffer;
|
|
adis->xfer[1].bits_per_word = 8;
|
|
adis->xfer[1].len = burst_length;
|
|
|
|
spi_message_init(&adis->msg);
|
|
spi_message_add_tail(&adis->xfer[0], &adis->msg);
|
|
spi_message_add_tail(&adis->xfer[1], &adis->msg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
irqreturn_t adis16400_trigger_handler(int irq, void *p)
|
|
{
|
|
struct iio_poll_func *pf = p;
|
|
struct iio_dev *indio_dev = pf->indio_dev;
|
|
struct adis16400_state *st = iio_priv(indio_dev);
|
|
struct adis *adis = &st->adis;
|
|
u32 old_speed_hz = st->adis.spi->max_speed_hz;
|
|
void *buffer;
|
|
int ret;
|
|
|
|
if (!adis->buffer)
|
|
return -ENOMEM;
|
|
|
|
if (!(st->variant->flags & ADIS16400_NO_BURST) &&
|
|
st->adis.spi->max_speed_hz > ADIS16400_SPI_BURST) {
|
|
st->adis.spi->max_speed_hz = ADIS16400_SPI_BURST;
|
|
spi_setup(st->adis.spi);
|
|
}
|
|
|
|
ret = spi_sync(adis->spi, &adis->msg);
|
|
if (ret)
|
|
dev_err(&adis->spi->dev, "Failed to read data: %d\n", ret);
|
|
|
|
if (!(st->variant->flags & ADIS16400_NO_BURST)) {
|
|
st->adis.spi->max_speed_hz = old_speed_hz;
|
|
spi_setup(st->adis.spi);
|
|
}
|
|
|
|
if (st->variant->flags & ADIS16400_BURST_DIAG_STAT)
|
|
buffer = adis->buffer + sizeof(u16);
|
|
else
|
|
buffer = adis->buffer;
|
|
|
|
iio_push_to_buffers_with_timestamp(indio_dev, buffer,
|
|
pf->timestamp);
|
|
|
|
iio_trigger_notify_done(indio_dev->trig);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|