Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 216 insertions, 0 deletions

diff --git a/drivers/iio/imu/adis_buffer.c b/drivers/iio/imu/adis_buffer.c
new file mode 100644
index 000000000..928933027
--- /dev/null
+++ b/drivers/iio/imu/adis_buffer.c
@@ -0,0 +1,216 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Common library for ADIS16XXX devices
+ *
+ * Copyright 2012 Analog Devices Inc.
+ *   Author: Lars-Peter Clausen <lars@metafoo.de>
+ */
+
+#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>
+
+static int adis_update_scan_mode_burst(struct iio_dev *indio_dev,
+				       const unsigned long *scan_mask)
+{
+	struct adis *adis = iio_device_get_drvdata(indio_dev);
+	unsigned int burst_length, burst_max_length;
+	u8 *tx;
+
+	burst_length = adis->data->burst_len + adis->burst_extra_len;
+
+	if (adis->data->burst_max_len)
+		burst_max_length = adis->data->burst_max_len;
+	else
+		burst_max_length = burst_length;
+
+	adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL);
+	if (!adis->xfer)
+		return -ENOMEM;
+
+	adis->buffer = kzalloc(burst_max_length + sizeof(u16), GFP_KERNEL);
+	if (!adis->buffer) {
+		kfree(adis->xfer);
+		adis->xfer = NULL;
+		return -ENOMEM;
+	}
+
+	tx = adis->buffer + burst_max_length;
+	tx[0] = ADIS_READ_REG(adis->data->burst_reg_cmd);
+	tx[1] = 0;
+
+	adis->xfer[0].tx_buf = tx;
+	adis->xfer[0].bits_per_word = 8;
+	adis->xfer[0].len = 2;
+	if (adis->data->burst_max_speed_hz)
+		adis->xfer[0].speed_hz = adis->data->burst_max_speed_hz;
+	adis->xfer[1].rx_buf = adis->buffer;
+	adis->xfer[1].bits_per_word = 8;
+	adis->xfer[1].len = burst_length;
+	if (adis->data->burst_max_speed_hz)
+		adis->xfer[1].speed_hz = adis->data->burst_max_speed_hz;
+
+	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;
+}
+
+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);
+
+	if (adis->data->burst_len)
+		return adis_update_scan_mode_burst(indio_dev, scan_mask);
+
+	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) {
+		kfree(adis->xfer);
+		adis->xfer = NULL;
+		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.value = adis->data->read_delay;
+		adis->xfer[j].delay.unit = SPI_DELAY_UNIT_USECS;
+		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_NS_GPL(adis_update_scan_mode, IIO_ADISLIB);
+
+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->data->has_paging) {
+		mutex_lock(&adis->state_lock);
+		if (adis->current_page != 0) {
+			adis->tx[0] = ADIS_WRITE_REG(ADIS_REG_PAGE_ID);
+			adis->tx[1] = 0;
+			ret = spi_write(adis->spi, adis->tx, 2);
+			if (ret) {
+				dev_err(&adis->spi->dev, "Failed to change device page: %d\n", ret);
+				mutex_unlock(&adis->state_lock);
+				goto irq_done;
+			}
+
+			adis->current_page = 0;
+		}
+	}
+
+	ret = spi_sync(adis->spi, &adis->msg);
+	if (adis->data->has_paging)
+		mutex_unlock(&adis->state_lock);
+	if (ret) {
+		dev_err(&adis->spi->dev, "Failed to read data: %d", ret);
+		goto irq_done;
+	}
+
+	iio_push_to_buffers_with_timestamp(indio_dev, adis->buffer,
+					   pf->timestamp);
+
+irq_done:
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+
+static void adis_buffer_cleanup(void *arg)
+{
+	struct adis *adis = arg;
+
+	kfree(adis->buffer);
+	kfree(adis->xfer);
+}
+
+/**
+ * devm_adis_setup_buffer_and_trigger() - Sets up buffer and trigger for
+ *					  the managed 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.
+ */
+int
+devm_adis_setup_buffer_and_trigger(struct adis *adis, struct iio_dev *indio_dev,
+				   irq_handler_t trigger_handler)
+{
+	int ret;
+
+	if (!trigger_handler)
+		trigger_handler = adis_trigger_handler;
+
+	ret = devm_iio_triggered_buffer_setup(&adis->spi->dev, indio_dev,
+					      &iio_pollfunc_store_time,
+					      trigger_handler, NULL);
+	if (ret)
+		return ret;
+
+	if (adis->spi->irq) {
+		ret = devm_adis_probe_trigger(adis, indio_dev);
+		if (ret)
+			return ret;
+	}
+
+	return devm_add_action_or_reset(&adis->spi->dev, adis_buffer_cleanup,
+					adis);
+}
+EXPORT_SYMBOL_NS_GPL(devm_adis_setup_buffer_and_trigger, IIO_ADISLIB);
+