iio: imu: adis: generalize burst mode support

Some variants in the ADIS16400 family support burst mode. This mechanism is
implemented in the `adis16400_buffer.c` file.

Some variants in ADIS16480 are also adding burst mode, which is
functionally similar to ADIS16400, but with different parameters. To get
there, a `adis_burst` struct is added to parametrize certain bits of the
SPI communication to setup: the register that triggers burst-mode, and the
extra-data-length that needs be accounted for when building the bust-length
buffer.

The trigger handler cannot be made generic, since it's very specific to
each ADIS164XX family.

A future enhancement of this `adis_burst` mode will be the possibility to
enable/disable burst-mode. For the ADIS16400 family it's hard-coded to on
by default. But for ADIS16480 there will be a need to disable this.

When that will be implemented, both ADIS16400 & ADIS16480 will have the
burst-mode enable-able/disable-able.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/imu/adis16400_buffer.c b/drivers/iio/imu/adis16400_buffer.c
index 268349e..199bd72 100644 (file)
--- a/drivers/iio/imu/adis16400_buffer.c
+++ b/drivers/iio/imu/adis16400_buffer.c
@@ -22,7 +22,7 @@ int adis16400_update_scan_mode(struct iio_dev *indio_dev,
        unsigned int burst_length;
        u8 *tx;
 
-       if (st->variant->flags & ADIS16400_NO_BURST)
+       if (!adis->burst || !adis->burst->en)
                return adis_update_scan_mode(indio_dev, scan_mask);
 
        kfree(adis->xfer);
@@ -30,8 +30,7 @@ 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);
+       burst_length += adis->burst->extra_len;
 
        adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL);
        if (!adis->xfer)
@@ -42,7 +41,7 @@ int adis16400_update_scan_mode(struct iio_dev *indio_dev,
                return -ENOMEM;
 
        tx = adis->buffer + burst_length;
-       tx[0] = ADIS_READ_REG(ADIS16400_GLOB_CMD);
+       tx[0] = ADIS_READ_REG(adis->burst->reg_cmd);
        tx[1] = 0;
 
        adis->xfer[0].tx_buf = tx;

diff --git a/drivers/iio/imu/adis16400_core.c b/drivers/iio/imu/adis16400_core.c
index f9cb9e1..093c809 100644 (file)
--- a/drivers/iio/imu/adis16400_core.c
+++ b/drivers/iio/imu/adis16400_core.c
@@ -146,6 +146,11 @@ enum adis16400_chip_variant {
        ADIS16448,
 };
 
+static struct adis_burst adis16400_burst = {
+       .en = true,
+       .reg_cmd = ADIS16400_GLOB_CMD,
+};
+
 static int adis16334_get_freq(struct adis16400_state *st)
 {
        int ret;
@@ -972,6 +977,9 @@ static int adis16400_probe(struct spi_device *spi)
        if (!(st->variant->flags & ADIS16400_NO_BURST)) {
                adis16400_setup_chan_mask(st);
                indio_dev->available_scan_masks = st->avail_scan_mask;
+               st->adis.burst = &adis16400_burst;
+               if (st->variant->flags & ADIS16400_BURST_DIAG_STAT)
+                       st->adis.burst->extra_len = sizeof(u16);
        }
 
        ret = adis_init(&st->adis, indio_dev, spi, &adis16400_data);

diff --git a/include/linux/iio/imu/adis.h b/include/linux/iio/imu/adis.h
index 360da7d..469a493 100644 (file)
--- a/include/linux/iio/imu/adis.h
+++ b/include/linux/iio/imu/adis.h
@@ -21,6 +21,7 @@
 #define ADIS_REG_PAGE_ID 0x00
 
 struct adis;
+struct adis_burst;
 
 /**
  * struct adis_data - ADIS chip variant specific data
@@ -57,6 +58,7 @@ struct adis {
        struct iio_trigger      *trig;
 
        const struct adis_data  *data;
+       struct adis_burst       *burst;
 
        struct mutex            txrx_lock;
        struct spi_message      msg;
@@ -232,6 +234,18 @@ int adis_single_conversion(struct iio_dev *indio_dev,
 
 #ifdef CONFIG_IIO_ADIS_LIB_BUFFER
 
+/**
+ * struct adis_burst - ADIS data for burst transfers
+ * @en                 burst mode enabled
+ * @reg_cmd            register command that triggers burst
+ * @extra_len          extra length to account in the SPI RX buffer
+ */
+struct adis_burst {
+       bool            en;
+       unsigned int    reg_cmd;
+       unsigned int    extra_len;
+};
+
 int adis_setup_buffer_and_trigger(struct adis *adis,
        struct iio_dev *indio_dev, irqreturn_t (*trigger_handler)(int, void *));
 void adis_cleanup_buffer_and_trigger(struct adis *adis,