1 files changed, 422 insertions, 0 deletions
diff --git a/drivers/media/test-drivers/vimc/vimc-scaler.c b/drivers/media/test-drivers/vimc/vimc-scaler.c
new file mode 100644
index 000000000000..47d0d63865a0
--- /dev/null
+++ b/drivers/media/test-drivers/vimc/vimc-scaler.c
@@ -0,0 +1,422 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * vimc-scaler.c Virtual Media Controller Driver
+ *
+ * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
+ */
+
+#include <linux/moduleparam.h>
+#include <linux/string.h>
+#include <linux/vmalloc.h>
+#include <linux/v4l2-mediabus.h>
+#include <media/v4l2-rect.h>
+#include <media/v4l2-subdev.h>
+
+#include "vimc-common.h"
+
+/* Pad identifier */
+enum vimc_scaler_pad {
+	VIMC_SCALER_SINK = 0,
+	VIMC_SCALER_SRC = 1,
+};
+
+#define VIMC_SCALER_FMT_WIDTH_DEFAULT  640
+#define VIMC_SCALER_FMT_HEIGHT_DEFAULT 480
+
+struct vimc_scaler_device {
+	struct vimc_ent_device ved;
+	struct v4l2_subdev sd;
+	struct media_pad pads[2];
+
+	u8 *src_frame;
+
+	/*
+	 * Virtual "hardware" configuration, filled when the stream starts or
+	 * when controls are set.
+	 */
+	struct {
+		struct v4l2_mbus_framefmt sink_fmt;
+		struct v4l2_mbus_framefmt src_fmt;
+		struct v4l2_rect sink_crop;
+		unsigned int bpp;
+	} hw;
+};
+
+static const struct v4l2_mbus_framefmt fmt_default = {
+	.width = VIMC_SCALER_FMT_WIDTH_DEFAULT,
+	.height = VIMC_SCALER_FMT_HEIGHT_DEFAULT,
+	.code = MEDIA_BUS_FMT_RGB888_1X24,
+	.field = V4L2_FIELD_NONE,
+	.colorspace = V4L2_COLORSPACE_SRGB,
+};
+
+static const struct v4l2_rect crop_rect_default = {
+	.width = VIMC_SCALER_FMT_WIDTH_DEFAULT,
+	.height = VIMC_SCALER_FMT_HEIGHT_DEFAULT,
+	.top = 0,
+	.left = 0,
+};
+
+static const struct v4l2_rect crop_rect_min = {
+	.width = VIMC_FRAME_MIN_WIDTH,
+	.height = VIMC_FRAME_MIN_HEIGHT,
+	.top = 0,
+	.left = 0,
+};
+
+static struct v4l2_rect
+vimc_scaler_get_crop_bound_sink(const struct v4l2_mbus_framefmt *sink_fmt)
+{
+	/* Get the crop bounds to clamp the crop rectangle correctly */
+	struct v4l2_rect r = {
+		.left = 0,
+		.top = 0,
+		.width = sink_fmt->width,
+		.height = sink_fmt->height,
+	};
+	return r;
+}
+
+static int vimc_scaler_init_state(struct v4l2_subdev *sd,
+				  struct v4l2_subdev_state *sd_state)
+{
+	struct v4l2_mbus_framefmt *mf;
+	struct v4l2_rect *r;
+	unsigned int i;
+
+	for (i = 0; i < sd->entity.num_pads; i++) {
+		mf = v4l2_subdev_state_get_format(sd_state, i);
+		*mf = fmt_default;
+	}
+
+	r = v4l2_subdev_state_get_crop(sd_state, VIMC_SCALER_SINK);
+	*r = crop_rect_default;
+
+	return 0;
+}
+
+static int vimc_scaler_enum_mbus_code(struct v4l2_subdev *sd,
+				   struct v4l2_subdev_state *sd_state,
+				   struct v4l2_subdev_mbus_code_enum *code)
+{
+	u32 mbus_code = vimc_mbus_code_by_index(code->index);
+	const struct vimc_pix_map *vpix;
+
+	if (!mbus_code)
+		return -EINVAL;
+
+	vpix = vimc_pix_map_by_code(mbus_code);
+
+	/* We don't support bayer format */
+	if (!vpix || vpix->bayer)
+		return -EINVAL;
+
+	code->code = mbus_code;
+
+	return 0;
+}
+
+static int vimc_scaler_enum_frame_size(struct v4l2_subdev *sd,
+				    struct v4l2_subdev_state *sd_state,
+				    struct v4l2_subdev_frame_size_enum *fse)
+{
+	const struct vimc_pix_map *vpix;
+
+	if (fse->index)
+		return -EINVAL;
+
+	/* Only accept code in the pix map table in non bayer format */
+	vpix = vimc_pix_map_by_code(fse->code);
+	if (!vpix || vpix->bayer)
+		return -EINVAL;
+
+	fse->min_width = VIMC_FRAME_MIN_WIDTH;
+	fse->min_height = VIMC_FRAME_MIN_HEIGHT;
+
+	fse->max_width = VIMC_FRAME_MAX_WIDTH;
+	fse->max_height = VIMC_FRAME_MAX_HEIGHT;
+
+	return 0;
+}
+
+static int vimc_scaler_set_fmt(struct v4l2_subdev *sd,
+			    struct v4l2_subdev_state *sd_state,
+			    struct v4l2_subdev_format *format)
+{
+	struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd);
+	struct v4l2_mbus_framefmt *fmt;
+
+	/* Do not change the active format while stream is on */
+	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE && vscaler->src_frame)
+		return -EBUSY;
+
+	fmt = v4l2_subdev_state_get_format(sd_state, format->pad);
+
+	/*
+	 * The media bus code and colorspace can only be changed on the sink
+	 * pad, the source pad only follows.
+	 */
+	if (format->pad == VIMC_SCALER_SINK) {
+		const struct vimc_pix_map *vpix;
+
+		/* Only accept code in the pix map table in non bayer format. */
+		vpix = vimc_pix_map_by_code(format->format.code);
+		if (vpix && !vpix->bayer)
+			fmt->code = format->format.code;
+		else
+			fmt->code = fmt_default.code;
+
+		/* Clamp the colorspace to valid values. */
+		fmt->colorspace = format->format.colorspace;
+		fmt->ycbcr_enc = format->format.ycbcr_enc;
+		fmt->quantization = format->format.quantization;
+		fmt->xfer_func = format->format.xfer_func;
+		vimc_colorimetry_clamp(fmt);
+	}
+
+	/* Clamp and align the width and height */
+	fmt->width = clamp_t(u32, format->format.width, VIMC_FRAME_MIN_WIDTH,
+			     VIMC_FRAME_MAX_WIDTH) & ~1;
+	fmt->height = clamp_t(u32, format->format.height, VIMC_FRAME_MIN_HEIGHT,
+			      VIMC_FRAME_MAX_HEIGHT) & ~1;
+
+	/*
+	 * Propagate the sink pad format to the crop rectangle and the source
+	 * pad.
+	 */
+	if (format->pad == VIMC_SCALER_SINK) {
+		struct v4l2_mbus_framefmt *src_fmt;
+		struct v4l2_rect *crop;
+
+		crop = v4l2_subdev_state_get_crop(sd_state, VIMC_SCALER_SINK);
+		crop->width = fmt->width;
+		crop->height = fmt->height;
+		crop->top = 0;
+		crop->left = 0;
+
+		src_fmt = v4l2_subdev_state_get_format(sd_state, VIMC_SCALER_SRC);
+		*src_fmt = *fmt;
+	}
+
+	format->format = *fmt;
+
+	return 0;
+}
+
+static int vimc_scaler_get_selection(struct v4l2_subdev *sd,
+				  struct v4l2_subdev_state *sd_state,
+				  struct v4l2_subdev_selection *sel)
+{
+	struct v4l2_mbus_framefmt *sink_fmt;
+
+	if (VIMC_IS_SRC(sel->pad))
+		return -EINVAL;
+
+	switch (sel->target) {
+	case V4L2_SEL_TGT_CROP:
+		sel->r = *v4l2_subdev_state_get_crop(sd_state, VIMC_SCALER_SINK);
+		break;
+	case V4L2_SEL_TGT_CROP_BOUNDS:
+		sink_fmt = v4l2_subdev_state_get_format(sd_state, VIMC_SCALER_SINK);
+		sel->r = vimc_scaler_get_crop_bound_sink(sink_fmt);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void vimc_scaler_adjust_sink_crop(struct v4l2_rect *r,
+				      const struct v4l2_mbus_framefmt *sink_fmt)
+{
+	const struct v4l2_rect sink_rect =
+		vimc_scaler_get_crop_bound_sink(sink_fmt);
+
+	/* Disallow rectangles smaller than the minimal one. */
+	v4l2_rect_set_min_size(r, &crop_rect_min);
+	v4l2_rect_map_inside(r, &sink_rect);
+}
+
+static int vimc_scaler_set_selection(struct v4l2_subdev *sd,
+				  struct v4l2_subdev_state *sd_state,
+				  struct v4l2_subdev_selection *sel)
+{
+	struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd);
+	struct v4l2_mbus_framefmt *sink_fmt;
+	struct v4l2_rect *crop_rect;
+
+	/* Only support setting the crop of the sink pad */
+	if (VIMC_IS_SRC(sel->pad) || sel->target != V4L2_SEL_TGT_CROP)
+		return -EINVAL;
+
+	if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE && vscaler->src_frame)
+		return -EBUSY;
+
+	crop_rect = v4l2_subdev_state_get_crop(sd_state, VIMC_SCALER_SINK);
+	sink_fmt = v4l2_subdev_state_get_format(sd_state, VIMC_SCALER_SINK);
+	vimc_scaler_adjust_sink_crop(&sel->r, sink_fmt);
+	*crop_rect = sel->r;
+
+	return 0;
+}
+
+static const struct v4l2_subdev_pad_ops vimc_scaler_pad_ops = {
+	.enum_mbus_code		= vimc_scaler_enum_mbus_code,
+	.enum_frame_size	= vimc_scaler_enum_frame_size,
+	.get_fmt		= v4l2_subdev_get_fmt,
+	.set_fmt		= vimc_scaler_set_fmt,
+	.get_selection		= vimc_scaler_get_selection,
+	.set_selection		= vimc_scaler_set_selection,
+};
+
+static int vimc_scaler_s_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct vimc_scaler_device *vscaler = v4l2_get_subdevdata(sd);
+
+	if (enable) {
+		struct v4l2_subdev_state *state;
+		const struct v4l2_mbus_framefmt *format;
+		const struct v4l2_rect *rect;
+		unsigned int frame_size;
+
+		if (vscaler->src_frame)
+			return 0;
+
+		state = v4l2_subdev_lock_and_get_active_state(sd);
+
+		/* Save the bytes per pixel of the sink. */
+		format = v4l2_subdev_state_get_format(state, VIMC_SCALER_SINK);
+		vscaler->hw.sink_fmt = *format;
+		vscaler->hw.bpp = vimc_pix_map_by_code(format->code)->bpp;
+
+		/* Calculate the frame size of the source pad. */
+		format = v4l2_subdev_state_get_format(state, VIMC_SCALER_SRC);
+		vscaler->hw.src_fmt = *format;
+		frame_size = format->width * format->height * vscaler->hw.bpp;
+
+		rect = v4l2_subdev_state_get_crop(state, VIMC_SCALER_SINK);
+		vscaler->hw.sink_crop = *rect;
+
+		v4l2_subdev_unlock_state(state);
+
+		/*
+		 * Allocate the frame buffer. Use vmalloc to be able to allocate
+		 * a large amount of memory.
+		 */
+		vscaler->src_frame = vmalloc(frame_size);
+		if (!vscaler->src_frame)
+			return -ENOMEM;
+	} else {
+		if (!vscaler->src_frame)
+			return 0;
+
+		vfree(vscaler->src_frame);
+		vscaler->src_frame = NULL;
+	}
+
+	return 0;
+}
+
+static const struct v4l2_subdev_video_ops vimc_scaler_video_ops = {
+	.s_stream = vimc_scaler_s_stream,
+};
+
+static const struct v4l2_subdev_ops vimc_scaler_ops = {
+	.pad = &vimc_scaler_pad_ops,
+	.video = &vimc_scaler_video_ops,
+};
+
+static const struct v4l2_subdev_internal_ops vimc_scaler_internal_ops = {
+	.init_state = vimc_scaler_init_state,
+};
+
+static void vimc_scaler_fill_src_frame(const struct vimc_scaler_device *const vscaler,
+				    const u8 *const sink_frame)
+{
+	const struct v4l2_mbus_framefmt *sink_fmt = &vscaler->hw.sink_fmt;
+	const struct v4l2_mbus_framefmt *src_fmt = &vscaler->hw.src_fmt;
+	const struct v4l2_rect *r = &vscaler->hw.sink_crop;
+	unsigned int src_x, src_y;
+	u8 *walker = vscaler->src_frame;
+
+	/* Set each pixel at the src_frame to its sink_frame equivalent */
+	for (src_y = 0; src_y < src_fmt->height; src_y++) {
+		unsigned int snk_y, y_offset;
+
+		snk_y = (src_y * r->height) / src_fmt->height + r->top;
+		y_offset = snk_y * sink_fmt->width * vscaler->hw.bpp;
+
+		for (src_x = 0; src_x < src_fmt->width; src_x++) {
+			unsigned int snk_x, x_offset, index;
+
+			snk_x = (src_x * r->width) / src_fmt->width + r->left;
+			x_offset = snk_x * vscaler->hw.bpp;
+			index = y_offset + x_offset;
+			memcpy(walker, &sink_frame[index], vscaler->hw.bpp);
+			walker += vscaler->hw.bpp;
+		}
+	}
+}
+
+static void *vimc_scaler_process_frame(struct vimc_ent_device *ved,
+				    const void *sink_frame)
+{
+	struct vimc_scaler_device *vscaler = container_of(ved, struct vimc_scaler_device,
+						    ved);
+
+	/* If the stream in this node is not active, just return */
+	if (!vscaler->src_frame)
+		return ERR_PTR(-EINVAL);
+
+	vimc_scaler_fill_src_frame(vscaler, sink_frame);
+
+	return vscaler->src_frame;
+};
+
+static void vimc_scaler_release(struct vimc_ent_device *ved)
+{
+	struct vimc_scaler_device *vscaler =
+		container_of(ved, struct vimc_scaler_device, ved);
+
+	v4l2_subdev_cleanup(&vscaler->sd);
+	media_entity_cleanup(vscaler->ved.ent);
+	kfree(vscaler);
+}
+
+static struct vimc_ent_device *vimc_scaler_add(struct vimc_device *vimc,
+					    const char *vcfg_name)
+{
+	struct v4l2_device *v4l2_dev = &vimc->v4l2_dev;
+	struct vimc_scaler_device *vscaler;
+	int ret;
+
+	/* Allocate the vscaler struct */
+	vscaler = kzalloc(sizeof(*vscaler), GFP_KERNEL);
+	if (!vscaler)
+		return ERR_PTR(-ENOMEM);
+
+	/* Initialize ved and sd */
+	vscaler->pads[VIMC_SCALER_SINK].flags = MEDIA_PAD_FL_SINK;
+	vscaler->pads[VIMC_SCALER_SRC].flags = MEDIA_PAD_FL_SOURCE;
+
+	ret = vimc_ent_sd_register(&vscaler->ved, &vscaler->sd, v4l2_dev,
+				   vcfg_name,
+				   MEDIA_ENT_F_PROC_VIDEO_SCALER, 2,
+				   vscaler->pads, &vimc_scaler_internal_ops,
+				   &vimc_scaler_ops);
+	if (ret) {
+		kfree(vscaler);
+		return ERR_PTR(ret);
+	}
+
+	vscaler->ved.process_frame = vimc_scaler_process_frame;
+	vscaler->ved.dev = vimc->mdev.dev;
+
+	return &vscaler->ved;
+}
+
+const struct vimc_ent_type vimc_scaler_type = {
+	.add = vimc_scaler_add,
+	.release = vimc_scaler_release
+};