1 files changed, 369 insertions, 0 deletions

diff --git a/drivers/media/test-drivers/vimc/vimc-core.c b/drivers/media/test-drivers/vimc/vimc-core.c
new file mode 100644
index 000000000000..11210aaa2551
--- /dev/null
+++ b/drivers/media/test-drivers/vimc/vimc-core.c
@@ -0,0 +1,369 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * vimc-core.c Virtual Media Controller Driver
+ *
+ * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <media/media-device.h>
+#include <media/v4l2-device.h>
+
+#include "vimc-common.h"
+
+#define VIMC_MDEV_MODEL_NAME "VIMC MDEV"
+
+#define VIMC_ENT_LINK(src, srcpad, sink, sinkpad, link_flags) {	\
+	.src_ent = src,						\
+	.src_pad = srcpad,					\
+	.sink_ent = sink,					\
+	.sink_pad = sinkpad,					\
+	.flags = link_flags,					\
+}
+
+/* Structure which describes links between entities */
+struct vimc_ent_link {
+	unsigned int src_ent;
+	u16 src_pad;
+	unsigned int sink_ent;
+	u16 sink_pad;
+	u32 flags;
+};
+
+/* Structure which describes the whole topology */
+struct vimc_pipeline_config {
+	const struct vimc_ent_config *ents;
+	size_t num_ents;
+	const struct vimc_ent_link *links;
+	size_t num_links;
+};
+
+/* --------------------------------------------------------------------------
+ * Topology Configuration
+ */
+
+static struct vimc_ent_config ent_config[] = {
+	{
+		.name = "Sensor A",
+		.type = &vimc_sen_type
+	},
+	{
+		.name = "Sensor B",
+		.type = &vimc_sen_type
+	},
+	{
+		.name = "Debayer A",
+		.type = &vimc_deb_type
+	},
+	{
+		.name = "Debayer B",
+		.type = &vimc_deb_type
+	},
+	{
+		.name = "Raw Capture 0",
+		.type = &vimc_cap_type
+	},
+	{
+		.name = "Raw Capture 1",
+		.type = &vimc_cap_type
+	},
+	{
+		/* TODO: change this to vimc-input when it is implemented */
+		.name = "RGB/YUV Input",
+		.type = &vimc_sen_type
+	},
+	{
+		.name = "Scaler",
+		.type = &vimc_sca_type
+	},
+	{
+		.name = "RGB/YUV Capture",
+		.type = &vimc_cap_type
+	},
+};
+
+static const struct vimc_ent_link ent_links[] = {
+	/* Link: Sensor A (Pad 0)->(Pad 0) Debayer A */
+	VIMC_ENT_LINK(0, 0, 2, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
+	/* Link: Sensor A (Pad 0)->(Pad 0) Raw Capture 0 */
+	VIMC_ENT_LINK(0, 0, 4, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
+	/* Link: Sensor B (Pad 0)->(Pad 0) Debayer B */
+	VIMC_ENT_LINK(1, 0, 3, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
+	/* Link: Sensor B (Pad 0)->(Pad 0) Raw Capture 1 */
+	VIMC_ENT_LINK(1, 0, 5, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
+	/* Link: Debayer A (Pad 1)->(Pad 0) Scaler */
+	VIMC_ENT_LINK(2, 1, 7, 0, MEDIA_LNK_FL_ENABLED),
+	/* Link: Debayer B (Pad 1)->(Pad 0) Scaler */
+	VIMC_ENT_LINK(3, 1, 7, 0, 0),
+	/* Link: RGB/YUV Input (Pad 0)->(Pad 0) Scaler */
+	VIMC_ENT_LINK(6, 0, 7, 0, 0),
+	/* Link: Scaler (Pad 1)->(Pad 0) RGB/YUV Capture */
+	VIMC_ENT_LINK(7, 1, 8, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
+};
+
+static struct vimc_pipeline_config pipe_cfg = {
+	.ents		= ent_config,
+	.num_ents	= ARRAY_SIZE(ent_config),
+	.links		= ent_links,
+	.num_links	= ARRAY_SIZE(ent_links)
+};
+
+/* -------------------------------------------------------------------------- */
+
+static void vimc_rm_links(struct vimc_device *vimc)
+{
+	unsigned int i;
+
+	for (i = 0; i < vimc->pipe_cfg->num_ents; i++)
+		media_entity_remove_links(vimc->ent_devs[i]->ent);
+}
+
+static int vimc_create_links(struct vimc_device *vimc)
+{
+	unsigned int i;
+	int ret;
+
+	/* Initialize the links between entities */
+	for (i = 0; i < vimc->pipe_cfg->num_links; i++) {
+		const struct vimc_ent_link *link = &vimc->pipe_cfg->links[i];
+
+		struct vimc_ent_device *ved_src =
+			vimc->ent_devs[link->src_ent];
+		struct vimc_ent_device *ved_sink =
+			vimc->ent_devs[link->sink_ent];
+
+		ret = media_create_pad_link(ved_src->ent, link->src_pad,
+					    ved_sink->ent, link->sink_pad,
+					    link->flags);
+		if (ret)
+			goto err_rm_links;
+	}
+
+	return 0;
+
+err_rm_links:
+	vimc_rm_links(vimc);
+	return ret;
+}
+
+static void vimc_release_subdevs(struct vimc_device *vimc)
+{
+	unsigned int i;
+
+	for (i = 0; i < vimc->pipe_cfg->num_ents; i++)
+		if (vimc->ent_devs[i])
+			vimc->pipe_cfg->ents[i].type->release(vimc->ent_devs[i]);
+}
+
+static void vimc_unregister_subdevs(struct vimc_device *vimc)
+{
+	unsigned int i;
+
+	for (i = 0; i < vimc->pipe_cfg->num_ents; i++)
+		if (vimc->ent_devs[i] && vimc->pipe_cfg->ents[i].type->unregister)
+			vimc->pipe_cfg->ents[i].type->unregister(vimc->ent_devs[i]);
+}
+
+static int vimc_add_subdevs(struct vimc_device *vimc)
+{
+	unsigned int i;
+
+	for (i = 0; i < vimc->pipe_cfg->num_ents; i++) {
+		dev_dbg(vimc->mdev.dev, "new entity for %s\n",
+			vimc->pipe_cfg->ents[i].name);
+		vimc->ent_devs[i] = vimc->pipe_cfg->ents[i].type->add(vimc,
+					vimc->pipe_cfg->ents[i].name);
+		if (IS_ERR(vimc->ent_devs[i])) {
+			int err = PTR_ERR(vimc->ent_devs[i]);
+
+			dev_err(vimc->mdev.dev, "adding entity %s failed (%d)\n",
+				vimc->pipe_cfg->ents[i].name, err);
+			vimc->ent_devs[i] = NULL;
+			vimc_unregister_subdevs(vimc);
+			vimc_release_subdevs(vimc);
+			return err;
+		}
+	}
+	return 0;
+}
+
+static void vimc_v4l2_dev_release(struct v4l2_device *v4l2_dev)
+{
+	struct vimc_device *vimc =
+		container_of(v4l2_dev, struct vimc_device, v4l2_dev);
+
+	vimc_release_subdevs(vimc);
+	media_device_cleanup(&vimc->mdev);
+	kfree(vimc->ent_devs);
+	kfree(vimc);
+}
+
+static int vimc_register_devices(struct vimc_device *vimc)
+{
+	int ret;
+
+	/* Register the v4l2 struct */
+	ret = v4l2_device_register(vimc->mdev.dev, &vimc->v4l2_dev);
+	if (ret) {
+		dev_err(vimc->mdev.dev,
+			"v4l2 device register failed (err=%d)\n", ret);
+		return ret;
+	}
+	/* allocate ent_devs */
+	vimc->ent_devs = kcalloc(vimc->pipe_cfg->num_ents,
+				 sizeof(*vimc->ent_devs), GFP_KERNEL);
+	if (!vimc->ent_devs) {
+		ret = -ENOMEM;
+		goto err_v4l2_unregister;
+	}
+
+	/* Invoke entity config hooks to initialize and register subdevs */
+	ret = vimc_add_subdevs(vimc);
+	if (ret)
+		goto err_free_ent_devs;
+
+	/* Initialize links */
+	ret = vimc_create_links(vimc);
+	if (ret)
+		goto err_rm_subdevs;
+
+	/* Register the media device */
+	ret = media_device_register(&vimc->mdev);
+	if (ret) {
+		dev_err(vimc->mdev.dev,
+			"media device register failed (err=%d)\n", ret);
+		goto err_rm_subdevs;
+	}
+
+	/* Expose all subdev's nodes*/
+	ret = v4l2_device_register_subdev_nodes(&vimc->v4l2_dev);
+	if (ret) {
+		dev_err(vimc->mdev.dev,
+			"vimc subdev nodes registration failed (err=%d)\n",
+			ret);
+		goto err_mdev_unregister;
+	}
+
+	return 0;
+
+err_mdev_unregister:
+	media_device_unregister(&vimc->mdev);
+err_rm_subdevs:
+	vimc_unregister_subdevs(vimc);
+	vimc_release_subdevs(vimc);
+err_free_ent_devs:
+	kfree(vimc->ent_devs);
+err_v4l2_unregister:
+	v4l2_device_unregister(&vimc->v4l2_dev);
+
+	return ret;
+}
+
+static int vimc_probe(struct platform_device *pdev)
+{
+	struct vimc_device *vimc;
+	int ret;
+
+	dev_dbg(&pdev->dev, "probe");
+
+	vimc = kzalloc(sizeof(*vimc), GFP_KERNEL);
+	if (!vimc)
+		return -ENOMEM;
+
+	vimc->pipe_cfg = &pipe_cfg;
+
+	/* Link the media device within the v4l2_device */
+	vimc->v4l2_dev.mdev = &vimc->mdev;
+
+	/* Initialize media device */
+	strscpy(vimc->mdev.model, VIMC_MDEV_MODEL_NAME,
+		sizeof(vimc->mdev.model));
+	snprintf(vimc->mdev.bus_info, sizeof(vimc->mdev.bus_info),
+		 "platform:%s", VIMC_PDEV_NAME);
+	vimc->mdev.dev = &pdev->dev;
+	media_device_init(&vimc->mdev);
+
+	ret = vimc_register_devices(vimc);
+	if (ret) {
+		media_device_cleanup(&vimc->mdev);
+		kfree(vimc);
+		return ret;
+	}
+	/*
+	 * the release cb is set only after successful registration.
+	 * if the registration fails, we release directly from probe
+	 */
+
+	vimc->v4l2_dev.release = vimc_v4l2_dev_release;
+	platform_set_drvdata(pdev, vimc);
+	return 0;
+}
+
+static int vimc_remove(struct platform_device *pdev)
+{
+	struct vimc_device *vimc = platform_get_drvdata(pdev);
+
+	dev_dbg(&pdev->dev, "remove");
+
+	vimc_unregister_subdevs(vimc);
+	media_device_unregister(&vimc->mdev);
+	v4l2_device_unregister(&vimc->v4l2_dev);
+	v4l2_device_put(&vimc->v4l2_dev);
+
+	return 0;
+}
+
+static void vimc_dev_release(struct device *dev)
+{
+}
+
+static struct platform_device vimc_pdev = {
+	.name = VIMC_PDEV_NAME,
+	.dev.release = vimc_dev_release,
+};
+
+static struct platform_driver vimc_pdrv = {
+	.probe		= vimc_probe,
+	.remove		= vimc_remove,
+	.driver		= {
+		.name	= VIMC_PDEV_NAME,
+	},
+};
+
+static int __init vimc_init(void)
+{
+	int ret;
+
+	ret = platform_device_register(&vimc_pdev);
+	if (ret) {
+		dev_err(&vimc_pdev.dev,
+			"platform device registration failed (err=%d)\n", ret);
+		return ret;
+	}
+
+	ret = platform_driver_register(&vimc_pdrv);
+	if (ret) {
+		dev_err(&vimc_pdev.dev,
+			"platform driver registration failed (err=%d)\n", ret);
+		platform_driver_unregister(&vimc_pdrv);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void __exit vimc_exit(void)
+{
+	platform_driver_unregister(&vimc_pdrv);
+
+	platform_device_unregister(&vimc_pdev);
+}
+
+module_init(vimc_init);
+module_exit(vimc_exit);
+
+MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC)");
+MODULE_AUTHOR("Helen Fornazier <helen.fornazier@gmail.com>");
+MODULE_LICENSE("GPL");