v4.19.13 snapshot.
diff --git a/drivers/iio/imu/adis_buffer.c b/drivers/iio/imu/adis_buffer.c
new file mode 100644
index 0000000..76643c5
--- /dev/null
+++ b/drivers/iio/imu/adis_buffer.c
@@ -0,0 +1,171 @@
+/*
+ * Common library for ADIS16XXX devices
+ *
+ * Copyright 2012 Analog Devices Inc.
+ * Author: Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/export.h>
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+#include <linux/kernel.h>
+#include <linux/spi/spi.h>
+#include <linux/slab.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/imu/adis.h>
+
+int adis_update_scan_mode(struct iio_dev *indio_dev,
+ const unsigned long *scan_mask)
+{
+ struct adis *adis = iio_device_get_drvdata(indio_dev);
+ const struct iio_chan_spec *chan;
+ unsigned int scan_count;
+ unsigned int i, j;
+ __be16 *tx, *rx;
+
+ kfree(adis->xfer);
+ kfree(adis->buffer);
+
+ scan_count = indio_dev->scan_bytes / 2;
+
+ adis->xfer = kcalloc(scan_count + 1, sizeof(*adis->xfer), GFP_KERNEL);
+ if (!adis->xfer)
+ return -ENOMEM;
+
+ adis->buffer = kcalloc(indio_dev->scan_bytes, 2, GFP_KERNEL);
+ if (!adis->buffer)
+ return -ENOMEM;
+
+ rx = adis->buffer;
+ tx = rx + scan_count;
+
+ spi_message_init(&adis->msg);
+
+ for (j = 0; j <= scan_count; j++) {
+ adis->xfer[j].bits_per_word = 8;
+ if (j != scan_count)
+ adis->xfer[j].cs_change = 1;
+ adis->xfer[j].len = 2;
+ adis->xfer[j].delay_usecs = adis->data->read_delay;
+ if (j < scan_count)
+ adis->xfer[j].tx_buf = &tx[j];
+ if (j >= 1)
+ adis->xfer[j].rx_buf = &rx[j - 1];
+ spi_message_add_tail(&adis->xfer[j], &adis->msg);
+ }
+
+ chan = indio_dev->channels;
+ for (i = 0; i < indio_dev->num_channels; i++, chan++) {
+ if (!test_bit(chan->scan_index, scan_mask))
+ continue;
+ if (chan->scan_type.storagebits == 32)
+ *tx++ = cpu_to_be16((chan->address + 2) << 8);
+ *tx++ = cpu_to_be16(chan->address << 8);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(adis_update_scan_mode);
+
+static irqreturn_t adis_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct adis *adis = iio_device_get_drvdata(indio_dev);
+ int ret;
+
+ if (!adis->buffer)
+ return -ENOMEM;
+
+ if (adis->data->has_paging) {
+ mutex_lock(&adis->txrx_lock);
+ if (adis->current_page != 0) {
+ adis->tx[0] = ADIS_WRITE_REG(ADIS_REG_PAGE_ID);
+ adis->tx[1] = 0;
+ spi_write(adis->spi, adis->tx, 2);
+ }
+ }
+
+ ret = spi_sync(adis->spi, &adis->msg);
+ if (ret)
+ dev_err(&adis->spi->dev, "Failed to read data: %d", ret);
+
+
+ if (adis->data->has_paging) {
+ adis->current_page = 0;
+ mutex_unlock(&adis->txrx_lock);
+ }
+
+ iio_push_to_buffers_with_timestamp(indio_dev, adis->buffer,
+ pf->timestamp);
+
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+/**
+ * adis_setup_buffer_and_trigger() - Sets up buffer and trigger for the adis device
+ * @adis: The adis device.
+ * @indio_dev: The IIO device.
+ * @trigger_handler: Optional trigger handler, may be NULL.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ *
+ * This function sets up the buffer and trigger for a adis devices. If
+ * 'trigger_handler' is NULL the default trigger handler will be used. The
+ * default trigger handler will simply read the registers assigned to the
+ * currently active channels.
+ *
+ * adis_cleanup_buffer_and_trigger() should be called to free the resources
+ * allocated by this function.
+ */
+int adis_setup_buffer_and_trigger(struct adis *adis, struct iio_dev *indio_dev,
+ irqreturn_t (*trigger_handler)(int, void *))
+{
+ int ret;
+
+ if (!trigger_handler)
+ trigger_handler = adis_trigger_handler;
+
+ ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
+ trigger_handler, NULL);
+ if (ret)
+ return ret;
+
+ if (adis->spi->irq) {
+ ret = adis_probe_trigger(adis, indio_dev);
+ if (ret)
+ goto error_buffer_cleanup;
+ }
+ return 0;
+
+error_buffer_cleanup:
+ iio_triggered_buffer_cleanup(indio_dev);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(adis_setup_buffer_and_trigger);
+
+/**
+ * adis_cleanup_buffer_and_trigger() - Free buffer and trigger resources
+ * @adis: The adis device.
+ * @indio_dev: The IIO device.
+ *
+ * Frees resources allocated by adis_setup_buffer_and_trigger()
+ */
+void adis_cleanup_buffer_and_trigger(struct adis *adis,
+ struct iio_dev *indio_dev)
+{
+ if (adis->spi->irq)
+ adis_remove_trigger(adis);
+ kfree(adis->buffer);
+ kfree(adis->xfer);
+ iio_triggered_buffer_cleanup(indio_dev);
+}
+EXPORT_SYMBOL_GPL(adis_cleanup_buffer_and_trigger);