[media] v4l: vsp1: Add LUT support
The Look-Up Table looks up values in 8-bit indexed tables separately for
each color component.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
diff --git a/drivers/media/platform/vsp1/vsp1_lut.c b/drivers/media/platform/vsp1/vsp1_lut.c
new file mode 100644
index 0000000..4e9dc7c
--- /dev/null
+++ b/drivers/media/platform/vsp1/vsp1_lut.c
@@ -0,0 +1,252 @@
+/*
+ * vsp1_lut.c -- R-Car VSP1 Look-Up Table
+ *
+ * Copyright (C) 2013 Renesas Corporation
+ *
+ * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/device.h>
+#include <linux/gfp.h>
+#include <linux/vsp1.h>
+
+#include <media/v4l2-subdev.h>
+
+#include "vsp1.h"
+#include "vsp1_lut.h"
+
+#define LUT_MIN_SIZE 4U
+#define LUT_MAX_SIZE 8190U
+
+/* -----------------------------------------------------------------------------
+ * Device Access
+ */
+
+static inline u32 vsp1_lut_read(struct vsp1_lut *lut, u32 reg)
+{
+ return vsp1_read(lut->entity.vsp1, reg);
+}
+
+static inline void vsp1_lut_write(struct vsp1_lut *lut, u32 reg, u32 data)
+{
+ vsp1_write(lut->entity.vsp1, reg, data);
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2 Subdevice Core Operations
+ */
+
+static void lut_configure(struct vsp1_lut *lut, struct vsp1_lut_config *config)
+{
+ memcpy_toio(lut->entity.vsp1->mmio + VI6_LUT_TABLE, config->lut,
+ sizeof(config->lut));
+}
+
+static long lut_ioctl(struct v4l2_subdev *subdev, unsigned int cmd, void *arg)
+{
+ struct vsp1_lut *lut = to_lut(subdev);
+
+ switch (cmd) {
+ case VIDIOC_VSP1_LUT_CONFIG:
+ lut_configure(lut, arg);
+ return 0;
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2 Subdevice Video Operations
+ */
+
+static int lut_s_stream(struct v4l2_subdev *subdev, int enable)
+{
+ struct vsp1_lut *lut = to_lut(subdev);
+
+ if (!enable)
+ return 0;
+
+ vsp1_lut_write(lut, VI6_LUT_CTRL, VI6_LUT_CTRL_EN);
+
+ return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2 Subdevice Pad Operations
+ */
+
+static int lut_enum_mbus_code(struct v4l2_subdev *subdev,
+ struct v4l2_subdev_fh *fh,
+ struct v4l2_subdev_mbus_code_enum *code)
+{
+ static const unsigned int codes[] = {
+ V4L2_MBUS_FMT_ARGB8888_1X32,
+ V4L2_MBUS_FMT_AHSV8888_1X32,
+ V4L2_MBUS_FMT_AYUV8_1X32,
+ };
+ struct v4l2_mbus_framefmt *format;
+
+ if (code->pad == LUT_PAD_SINK) {
+ if (code->index >= ARRAY_SIZE(codes))
+ return -EINVAL;
+
+ code->code = codes[code->index];
+ } else {
+ /* The LUT can't perform format conversion, the sink format is
+ * always identical to the source format.
+ */
+ if (code->index)
+ return -EINVAL;
+
+ format = v4l2_subdev_get_try_format(fh, LUT_PAD_SINK);
+ code->code = format->code;
+ }
+
+ return 0;
+}
+
+static int lut_enum_frame_size(struct v4l2_subdev *subdev,
+ struct v4l2_subdev_fh *fh,
+ struct v4l2_subdev_frame_size_enum *fse)
+{
+ struct v4l2_mbus_framefmt *format;
+
+ format = v4l2_subdev_get_try_format(fh, fse->pad);
+
+ if (fse->index || fse->code != format->code)
+ return -EINVAL;
+
+ if (fse->pad == LUT_PAD_SINK) {
+ fse->min_width = LUT_MIN_SIZE;
+ fse->max_width = LUT_MAX_SIZE;
+ fse->min_height = LUT_MIN_SIZE;
+ fse->max_height = LUT_MAX_SIZE;
+ } else {
+ /* The size on the source pad are fixed and always identical to
+ * the size on the sink pad.
+ */
+ fse->min_width = format->width;
+ fse->max_width = format->width;
+ fse->min_height = format->height;
+ fse->max_height = format->height;
+ }
+
+ return 0;
+}
+
+static int lut_get_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh,
+ struct v4l2_subdev_format *fmt)
+{
+ struct vsp1_lut *lut = to_lut(subdev);
+
+ fmt->format = *vsp1_entity_get_pad_format(&lut->entity, fh, fmt->pad,
+ fmt->which);
+
+ return 0;
+}
+
+static int lut_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh,
+ struct v4l2_subdev_format *fmt)
+{
+ struct vsp1_lut *lut = to_lut(subdev);
+ struct v4l2_mbus_framefmt *format;
+
+ /* Default to YUV if the requested format is not supported. */
+ if (fmt->format.code != V4L2_MBUS_FMT_ARGB8888_1X32 &&
+ fmt->format.code != V4L2_MBUS_FMT_AHSV8888_1X32 &&
+ fmt->format.code != V4L2_MBUS_FMT_AYUV8_1X32)
+ fmt->format.code = V4L2_MBUS_FMT_AYUV8_1X32;
+
+ format = vsp1_entity_get_pad_format(&lut->entity, fh, fmt->pad,
+ fmt->which);
+
+ if (fmt->pad == LUT_PAD_SOURCE) {
+ /* The LUT output format can't be modified. */
+ fmt->format = *format;
+ return 0;
+ }
+
+ format->width = clamp_t(unsigned int, fmt->format.width,
+ LUT_MIN_SIZE, LUT_MAX_SIZE);
+ format->height = clamp_t(unsigned int, fmt->format.height,
+ LUT_MIN_SIZE, LUT_MAX_SIZE);
+ format->field = V4L2_FIELD_NONE;
+ format->colorspace = V4L2_COLORSPACE_SRGB;
+
+ fmt->format = *format;
+
+ /* Propagate the format to the source pad. */
+ format = vsp1_entity_get_pad_format(&lut->entity, fh, LUT_PAD_SOURCE,
+ fmt->which);
+ *format = fmt->format;
+
+ return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2 Subdevice Operations
+ */
+
+static struct v4l2_subdev_core_ops lut_core_ops = {
+ .ioctl = lut_ioctl,
+};
+
+static struct v4l2_subdev_video_ops lut_video_ops = {
+ .s_stream = lut_s_stream,
+};
+
+static struct v4l2_subdev_pad_ops lut_pad_ops = {
+ .enum_mbus_code = lut_enum_mbus_code,
+ .enum_frame_size = lut_enum_frame_size,
+ .get_fmt = lut_get_format,
+ .set_fmt = lut_set_format,
+};
+
+static struct v4l2_subdev_ops lut_ops = {
+ .core = &lut_core_ops,
+ .video = &lut_video_ops,
+ .pad = &lut_pad_ops,
+};
+
+/* -----------------------------------------------------------------------------
+ * Initialization and Cleanup
+ */
+
+struct vsp1_lut *vsp1_lut_create(struct vsp1_device *vsp1)
+{
+ struct v4l2_subdev *subdev;
+ struct vsp1_lut *lut;
+ int ret;
+
+ lut = devm_kzalloc(vsp1->dev, sizeof(*lut), GFP_KERNEL);
+ if (lut == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ lut->entity.type = VSP1_ENTITY_LUT;
+ lut->entity.id = VI6_DPR_NODE_LUT;
+
+ ret = vsp1_entity_init(vsp1, &lut->entity, 2);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ /* Initialize the V4L2 subdev. */
+ subdev = &lut->entity.subdev;
+ v4l2_subdev_init(subdev, &lut_ops);
+
+ subdev->entity.ops = &vsp1_media_ops;
+ subdev->internal_ops = &vsp1_subdev_internal_ops;
+ snprintf(subdev->name, sizeof(subdev->name), "%s lut",
+ dev_name(vsp1->dev));
+ v4l2_set_subdevdata(subdev, lut);
+ subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+
+ vsp1_entity_init_formats(subdev, NULL);
+
+ return lut;
+}