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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>
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#include <linux/mutex.h>
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#include <linux/kernel.h>
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#include <linux/spi/spi.h>
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#include <linux/slab.h>
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#include <linux/bitops.h>
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#include <linux/export.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/trigger_consumer.h>
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#include "adis16400.h"
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int adis16400_update_scan_mode(struct iio_dev *indio_dev,
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const unsigned long *scan_mask)
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{
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struct adis16400_state *st = iio_priv(indio_dev);
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struct adis *adis = &st->adis;
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unsigned int burst_length;
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u8 *tx;
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if (st->variant->flags & ADIS16400_NO_BURST)
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return adis_update_scan_mode(indio_dev, scan_mask);
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kfree(adis->xfer);
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kfree(adis->buffer);
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/* All but the timestamp channel */
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burst_length = (indio_dev->num_channels - 1) * sizeof(u16);
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if (st->variant->flags & ADIS16400_BURST_DIAG_STAT)
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burst_length += sizeof(u16);
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adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL);
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if (!adis->xfer)
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return -ENOMEM;
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adis->buffer = kzalloc(burst_length + sizeof(u16), GFP_KERNEL);
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if (!adis->buffer)
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return -ENOMEM;
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tx = adis->buffer + burst_length;
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tx[0] = ADIS_READ_REG(ADIS16400_GLOB_CMD);
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tx[1] = 0;
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adis->xfer[0].tx_buf = tx;
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adis->xfer[0].bits_per_word = 8;
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adis->xfer[0].len = 2;
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adis->xfer[1].rx_buf = adis->buffer;
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adis->xfer[1].bits_per_word = 8;
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adis->xfer[1].len = burst_length;
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spi_message_init(&adis->msg);
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spi_message_add_tail(&adis->xfer[0], &adis->msg);
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spi_message_add_tail(&adis->xfer[1], &adis->msg);
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return 0;
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}
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irqreturn_t adis16400_trigger_handler(int irq, void *p)
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{
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struct iio_poll_func *pf = p;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct adis16400_state *st = iio_priv(indio_dev);
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struct adis *adis = &st->adis;
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u32 old_speed_hz = st->adis.spi->max_speed_hz;
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void *buffer;
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int ret;
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if (!adis->buffer)
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return -ENOMEM;
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if (!(st->variant->flags & ADIS16400_NO_BURST) &&
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st->adis.spi->max_speed_hz > ADIS16400_SPI_BURST) {
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st->adis.spi->max_speed_hz = ADIS16400_SPI_BURST;
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spi_setup(st->adis.spi);
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}
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ret = spi_sync(adis->spi, &adis->msg);
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if (ret)
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dev_err(&adis->spi->dev, "Failed to read data: %d\n", ret);
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if (!(st->variant->flags & ADIS16400_NO_BURST)) {
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st->adis.spi->max_speed_hz = old_speed_hz;
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spi_setup(st->adis.spi);
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}
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if (st->variant->flags & ADIS16400_BURST_DIAG_STAT)
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buffer = adis->buffer + sizeof(u16);
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else
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buffer = adis->buffer;
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iio_push_to_buffers_with_timestamp(indio_dev, buffer,
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pf->timestamp);
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iio_trigger_notify_done(indio_dev->trig);
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return IRQ_HANDLED;
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}
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