Merging upstream version 6.7.7.

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

1 files changed, 208 insertions, 0 deletions

diff --git a/drivers/media/pci/mgb4/mgb4_trigger.c b/drivers/media/pci/mgb4/mgb4_trigger.c
new file mode 100644
index 0000000000..923650d53d
--- /dev/null
+++ b/drivers/media/pci/mgb4/mgb4_trigger.c
@@ -0,0 +1,208 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2021-2023 Digiteq Automotive
+ *     author: Martin Tuma <martin.tuma@digiteqautomotive.com>
+ *
+ * This module handles the IIO trigger device. The card has two signal inputs
+ * for event triggers that can be used to record events related to the video
+ * stream. A standard linux IIO device with triggered buffer capability is
+ * created and configured that can be used to fetch the events with the same
+ * clock source as the video frames.
+ */
+
+#include <linux/iio/iio.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/pci.h>
+#include <linux/dma/amd_xdma.h>
+#include "mgb4_core.h"
+#include "mgb4_trigger.h"
+
+struct trigger_data {
+	struct mgb4_dev *mgbdev;
+	struct iio_trigger *trig;
+};
+
+static int trigger_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan, int *val,
+			    int *val2, long mask)
+{
+	struct trigger_data *st = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		if (iio_buffer_enabled(indio_dev))
+			return -EBUSY;
+		*val = mgb4_read_reg(&st->mgbdev->video, 0xA0);
+
+		return IIO_VAL_INT;
+	}
+
+	return -EINVAL;
+}
+
+static int trigger_set_state(struct iio_trigger *trig, bool state)
+{
+	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+	struct trigger_data *st = iio_priv(indio_dev);
+	int irq = xdma_get_user_irq(st->mgbdev->xdev, 11);
+
+	if (state)
+		xdma_enable_user_irq(st->mgbdev->xdev, irq);
+	else
+		xdma_disable_user_irq(st->mgbdev->xdev, irq);
+
+	return 0;
+}
+
+static const struct iio_trigger_ops trigger_ops = {
+	.set_trigger_state = &trigger_set_state,
+};
+
+static const struct iio_info trigger_info = {
+	.read_raw         = trigger_read_raw,
+};
+
+#define TRIGGER_CHANNEL(_si) {                    \
+	.type = IIO_ACTIVITY,                         \
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+	.scan_index = _si,                            \
+	.scan_type = {                                \
+		.sign = 'u',                              \
+		.realbits = 32,                           \
+		.storagebits = 32,                        \
+		.shift = 0,                               \
+		.endianness = IIO_CPU                     \
+	},                                            \
+}
+
+static const struct iio_chan_spec trigger_channels[] = {
+	TRIGGER_CHANNEL(0),
+	IIO_CHAN_SOFT_TIMESTAMP(1),
+};
+
+static irqreturn_t trigger_handler(int irq, void *p)
+{
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct trigger_data *st = iio_priv(indio_dev);
+	struct {
+		u32 data;
+		s64 ts __aligned(8);
+	} scan;
+
+	scan.data = mgb4_read_reg(&st->mgbdev->video, 0xA0);
+	mgb4_write_reg(&st->mgbdev->video, 0xA0, scan.data);
+
+	iio_push_to_buffers_with_timestamp(indio_dev, &scan, pf->timestamp);
+	iio_trigger_notify_done(indio_dev->trig);
+
+	mgb4_write_reg(&st->mgbdev->video, 0xB4, 1U << 11);
+
+	return IRQ_HANDLED;
+}
+
+static int probe_trigger(struct iio_dev *indio_dev, int irq)
+{
+	int ret;
+	struct trigger_data *st = iio_priv(indio_dev);
+
+	st->trig = iio_trigger_alloc(&st->mgbdev->pdev->dev, "%s-dev%d",
+				     indio_dev->name, iio_device_id(indio_dev));
+	if (!st->trig)
+		return -ENOMEM;
+
+	ret = request_irq(irq, &iio_trigger_generic_data_rdy_poll, 0,
+			  "mgb4-trigger", st->trig);
+	if (ret)
+		goto error_free_trig;
+
+	st->trig->ops = &trigger_ops;
+	iio_trigger_set_drvdata(st->trig, indio_dev);
+	ret = iio_trigger_register(st->trig);
+	if (ret)
+		goto error_free_irq;
+
+	indio_dev->trig = iio_trigger_get(st->trig);
+
+	return 0;
+
+error_free_irq:
+	free_irq(irq, st->trig);
+error_free_trig:
+	iio_trigger_free(st->trig);
+
+	return ret;
+}
+
+static void remove_trigger(struct iio_dev *indio_dev, int irq)
+{
+	struct trigger_data *st = iio_priv(indio_dev);
+
+	iio_trigger_unregister(st->trig);
+	free_irq(irq, st->trig);
+	iio_trigger_free(st->trig);
+}
+
+struct iio_dev *mgb4_trigger_create(struct mgb4_dev *mgbdev)
+{
+	struct iio_dev *indio_dev;
+	struct trigger_data *data;
+	struct pci_dev *pdev = mgbdev->pdev;
+	struct device *dev = &pdev->dev;
+	int rv, irq;
+
+	indio_dev = iio_device_alloc(dev, sizeof(*data));
+	if (!indio_dev)
+		return NULL;
+
+	indio_dev->info = &trigger_info;
+	indio_dev->name = "mgb4";
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = trigger_channels;
+	indio_dev->num_channels = ARRAY_SIZE(trigger_channels);
+
+	data = iio_priv(indio_dev);
+	data->mgbdev = mgbdev;
+
+	irq = xdma_get_user_irq(mgbdev->xdev, 11);
+	rv = probe_trigger(indio_dev, irq);
+	if (rv < 0) {
+		dev_err(dev, "iio triggered setup failed\n");
+		goto error_alloc;
+	}
+	rv = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
+					trigger_handler, NULL);
+	if (rv < 0) {
+		dev_err(dev, "iio triggered buffer setup failed\n");
+		goto error_trigger;
+	}
+	rv = iio_device_register(indio_dev);
+	if (rv < 0) {
+		dev_err(dev, "iio device register failed\n");
+		goto error_buffer;
+	}
+
+	return indio_dev;
+
+error_buffer:
+	iio_triggered_buffer_cleanup(indio_dev);
+error_trigger:
+	remove_trigger(indio_dev, irq);
+error_alloc:
+	iio_device_free(indio_dev);
+
+	return NULL;
+}
+
+void mgb4_trigger_free(struct iio_dev *indio_dev)
+{
+	struct trigger_data *st = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+	iio_triggered_buffer_cleanup(indio_dev);
+	remove_trigger(indio_dev, xdma_get_user_irq(st->mgbdev->xdev, 11));
+	iio_device_free(indio_dev);
+}