iio: adis16400: Fix burst transfer for adis16448

commit d046ba268adb87c7780494ecf897cbafbf100d57 upstream.

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: 76ada52f7f5d ("iio:adis16400: Add support for the adis16448")
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/imu/adis16400.h b/drivers/iio/imu/adis16400.h
index 1e8fd2e..73b189c 100644 (file)
--- a/drivers/iio/imu/adis16400.h
+++ b/drivers/iio/imu/adis16400.h
@@ -139,6 +139,7 @@
 #define ADIS16400_NO_BURST             BIT(1)
 #define ADIS16400_HAS_SLOW_MODE                BIT(2)
 #define ADIS16400_HAS_SERIAL_NUMBER    BIT(3)
+#define ADIS16400_BURST_DIAG_STAT      BIT(4)
 
 struct adis16400_state;
 

diff --git a/drivers/iio/imu/adis16400_buffer.c b/drivers/iio/imu/adis16400_buffer.c
index 629ae84..90c24a2 100644 (file)
--- a/drivers/iio/imu/adis16400_buffer.c
+++ b/drivers/iio/imu/adis16400_buffer.c
@@ -29,6 +29,8 @@ int adis16400_update_scan_mode(struct iio_dev *indio_dev,
 
        /* 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)
@@ -63,6 +65,7 @@ irqreturn_t adis16400_trigger_handler(int irq, void *p)
        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)
@@ -83,7 +86,12 @@ irqreturn_t adis16400_trigger_handler(int irq, void *p)
                spi_setup(st->adis.spi);
        }
 
-       iio_push_to_buffers_with_timestamp(indio_dev, adis->buffer,
+       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);

diff --git a/drivers/iio/imu/adis16400_core.c b/drivers/iio/imu/adis16400_core.c
index 7b06e05..2fd68f2 100644 (file)
--- a/drivers/iio/imu/adis16400_core.c
+++ b/drivers/iio/imu/adis16400_core.c
@@ -778,7 +778,8 @@ static struct adis16400_chip_info adis16400_chips[] = {
                .channels = adis16448_channels,
                .num_channels = ARRAY_SIZE(adis16448_channels),
                .flags = ADIS16400_HAS_PROD_ID |
-                               ADIS16400_HAS_SERIAL_NUMBER,
+                               ADIS16400_HAS_SERIAL_NUMBER |
+                               ADIS16400_BURST_DIAG_STAT,
                .gyro_scale_micro = IIO_DEGREE_TO_RAD(10000), /* 0.01 deg/s */
                .accel_scale_micro = IIO_G_TO_M_S_2(833), /* 1/1200 g */
                .temp_scale_nano = 73860000, /* 0.07386 C */