Implement scaler and integrated with the core
Signed-off-by: Helen Koike <helen.koike@xxxxxxxxxxxxx>
---
Changes in v2:
[media] vimc: sca: Add scaler
- Add function MEDIA_ENT_F_IO_V4L
- remove v4l2_dev and dev
- s/sink_mbus_fmt/sink_fmt
- remove BUG_ON, remove redundant if else, rewrite TODO, check end of enum
- rm src_width/height, enum fsize with min and max values
- set/try fmt
- remove unecessary include freezer.h
- core: add bayer boolean in pixel table
- coding style
- fix bug in enum frame size
- check pad types on create
- return EBUSY when trying to set the format while stream is on
- remove vsd struct
- add IS_SRC and IS_SINK macros
- add sca_mult as a parameter of the module
- check set_fmt default parameters for quantization, colorspace ...
- add more dev_dbg
---
drivers/media/platform/vimc/Makefile | 3 +-
drivers/media/platform/vimc/vimc-core.c | 33 ++-
drivers/media/platform/vimc/vimc-core.h | 1 +
drivers/media/platform/vimc/vimc-scaler.c | 426 ++++++++++++++++++++++++++++++
drivers/media/platform/vimc/vimc-scaler.h | 28 ++
5 files changed, 489 insertions(+), 2 deletions(-)
create mode 100644 drivers/media/platform/vimc/vimc-scaler.c
create mode 100644 drivers/media/platform/vimc/vimc-scaler.h
diff --git a/drivers/media/platform/vimc/Makefile b/drivers/media/platform/vimc/Makefile
index a6708f9..f13a594 100644
--- a/drivers/media/platform/vimc/Makefile
+++ b/drivers/media/platform/vimc/Makefile
@@ -1,3 +1,4 @@
-vimc-objs := vimc-core.o vimc-capture.o vimc-debayer.o vimc-sensor.o
+vimc-objs := vimc-core.o vimc-capture.o vimc-debayer.o vimc-scaler.o \
+ vimc-sensor.o
obj-$(CONFIG_VIDEO_VIMC) += vimc.o
diff --git a/drivers/media/platform/vimc/vimc-core.c b/drivers/media/platform/vimc/vimc-core.c
index 51cbbf6..3a04db2 100644
--- a/drivers/media/platform/vimc/vimc-core.c
+++ b/drivers/media/platform/vimc/vimc-core.c
@@ -24,6 +24,7 @@
#include "vimc-capture.h"
#include "vimc-core.h"
#include "vimc-debayer.h"
+#include "vimc-scaler.h"
#include "vimc-sensor.h"
#define VIMC_PDEV_NAME "vimc"
@@ -198,6 +199,10 @@ static const struct vimc_pipeline_config pipe_cfg = {
/* -------------------------------------------------------------------------- */
+/*
+ * NOTE: non-bayer formats need to come first (necessary for enum_mbus_code
+ * in the scaler)
+ */
static const struct vimc_pix_map vimc_pix_map_list[] = {
/* TODO: add all missing formats */
@@ -206,16 +211,19 @@ static const struct vimc_pix_map vimc_pix_map_list[] = {
.code = MEDIA_BUS_FMT_BGR888_1X24,
.pixelformat = V4L2_PIX_FMT_BGR24,
.bpp = 3,
+ .bayer = false,
},
{
.code = MEDIA_BUS_FMT_RGB888_1X24,
.pixelformat = V4L2_PIX_FMT_RGB24,
.bpp = 3,
+ .bayer = false,
},
{
.code = MEDIA_BUS_FMT_ARGB8888_1X32,
.pixelformat = V4L2_PIX_FMT_ARGB32,
.bpp = 4,
+ .bayer = false,
},
/* Bayer formats */
@@ -223,41 +231,49 @@ static const struct vimc_pix_map vimc_pix_map_list[] = {
.code = MEDIA_BUS_FMT_SBGGR8_1X8,
.pixelformat = V4L2_PIX_FMT_SBGGR8,
.bpp = 1,
+ .bayer = true,
},
{
.code = MEDIA_BUS_FMT_SGBRG8_1X8,
.pixelformat = V4L2_PIX_FMT_SGBRG8,
.bpp = 1,
+ .bayer = true,
},
{
.code = MEDIA_BUS_FMT_SGRBG8_1X8,
.pixelformat = V4L2_PIX_FMT_SGRBG8,
.bpp = 1,
+ .bayer = true,
},
{
.code = MEDIA_BUS_FMT_SRGGB8_1X8,
.pixelformat = V4L2_PIX_FMT_SRGGB8,
.bpp = 1,
+ .bayer = true,
},
{
.code = MEDIA_BUS_FMT_SBGGR10_1X10,
.pixelformat = V4L2_PIX_FMT_SBGGR10,
.bpp = 2,
+ .bayer = true,
},
{
.code = MEDIA_BUS_FMT_SGBRG10_1X10,
.pixelformat = V4L2_PIX_FMT_SGBRG10,
.bpp = 2,
+ .bayer = true,
},
{
.code = MEDIA_BUS_FMT_SGRBG10_1X10,
.pixelformat = V4L2_PIX_FMT_SGRBG10,
.bpp = 2,
+ .bayer = true,
},
{
.code = MEDIA_BUS_FMT_SRGGB10_1X10,
.pixelformat = V4L2_PIX_FMT_SRGGB10,
.bpp = 2,
+ .bayer = true,
},
/* 10bit raw bayer a-law compressed to 8 bits */
@@ -265,21 +281,25 @@ static const struct vimc_pix_map vimc_pix_map_list[] = {
.code = MEDIA_BUS_FMT_SBGGR10_ALAW8_1X8,
.pixelformat = V4L2_PIX_FMT_SBGGR10ALAW8,
.bpp = 1,
+ .bayer = true,
},
{
.code = MEDIA_BUS_FMT_SGBRG10_ALAW8_1X8,
.pixelformat = V4L2_PIX_FMT_SGBRG10ALAW8,
.bpp = 1,
+ .bayer = true,
},
{
.code = MEDIA_BUS_FMT_SGRBG10_ALAW8_1X8,
.pixelformat = V4L2_PIX_FMT_SGRBG10ALAW8,
.bpp = 1,
+ .bayer = true,
},
{
.code = MEDIA_BUS_FMT_SRGGB10_ALAW8_1X8,
.pixelformat = V4L2_PIX_FMT_SRGGB10ALAW8,
.bpp = 1,
+ .bayer = true,
},
/* 10bit raw bayer DPCM compressed to 8 bits */
@@ -287,41 +307,49 @@ static const struct vimc_pix_map vimc_pix_map_list[] = {
.code = MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8,
.pixelformat = V4L2_PIX_FMT_SBGGR10DPCM8,
.bpp = 1,
+ .bayer = true,
},
{
.code = MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8,
.pixelformat = V4L2_PIX_FMT_SGBRG10DPCM8,
.bpp = 1,
+ .bayer = true,
},
{
.code = MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
.pixelformat = V4L2_PIX_FMT_SGRBG10DPCM8,
.bpp = 1,
+ .bayer = true,
},
{
.code = MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8,
.pixelformat = V4L2_PIX_FMT_SRGGB10DPCM8,
.bpp = 1,
+ .bayer = true,
},
{
.code = MEDIA_BUS_FMT_SBGGR12_1X12,
.pixelformat = V4L2_PIX_FMT_SBGGR12,
.bpp = 2,
+ .bayer = true,
},
{
.code = MEDIA_BUS_FMT_SGBRG12_1X12,
.pixelformat = V4L2_PIX_FMT_SGBRG12,
.bpp = 2,
+ .bayer = true,
},
{
.code = MEDIA_BUS_FMT_SGRBG12_1X12,
.pixelformat = V4L2_PIX_FMT_SGRBG12,
.bpp = 2,
+ .bayer = true,
},
{
.code = MEDIA_BUS_FMT_SRGGB12_1X12,
.pixelformat = V4L2_PIX_FMT_SRGGB12,
.bpp = 2,
+ .bayer = true,
},
};
@@ -642,9 +670,12 @@ static int vimc_device_register(struct vimc_device *vimc)
create_func = vimc_deb_create;
break;
+ case VIMC_ENT_NODE_SCALER:
+ create_func = vimc_sca_create;
+ break;
+
/* TODO: Instantiate the specific topology node */
case VIMC_ENT_NODE_INPUT:
- case VIMC_ENT_NODE_SCALER:
default:
/*
* TODO: remove this when all the entities specific
diff --git a/drivers/media/platform/vimc/vimc-core.h b/drivers/media/platform/vimc/vimc-core.h
index 2e621fe..ac1c9ee 100644
--- a/drivers/media/platform/vimc/vimc-core.h
+++ b/drivers/media/platform/vimc/vimc-core.h
@@ -42,6 +42,7 @@ struct vimc_pix_map {
unsigned int code;
unsigned int bpp;
u32 pixelformat;
+ bool bayer;
};
/**
diff --git a/drivers/media/platform/vimc/vimc-scaler.c b/drivers/media/platform/vimc/vimc-scaler.c
new file mode 100644
index 0000000..9302d97
--- /dev/null
+++ b/drivers/media/platform/vimc/vimc-scaler.c
@@ -0,0 +1,426 @@
+/*
+ * vimc-scaler.c Virtual Media Controller Driver
+ *
+ * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@xxxxxxxxx>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+#include <linux/v4l2-mediabus.h>
+#include <media/v4l2-subdev.h>
+
+#include "vimc-scaler.h"
+
+static unsigned int sca_mult = 3;
+module_param(sca_mult, uint, 0000);
+MODULE_PARM_DESC(sca_mult, " the image size multiplier");
+
+#define IS_SINK(pad) (!pad)
+#define IS_SRC(pad) (pad)
+#define MAX_ZOOM 8
+
+struct vimc_sca_device {
+ struct vimc_ent_device ved;
+ struct v4l2_subdev sd;
+ /* NOTE: the source fmt is the same as the sink
+ * with the width and hight multiplied by mult
+ */
+ struct v4l2_mbus_framefmt sink_fmt;
+ /* Values calculated when the stream starts */
+ u8 *src_frame;
+ unsigned int src_frame_size;
+ unsigned int src_line_size;
+ unsigned int bpp;
+};
+
+static const struct v4l2_mbus_framefmt sink_fmt_default = {
+ .width = 640,
+ .height = 480,
+ .code = MEDIA_BUS_FMT_RGB888_1X24,
+ .field = V4L2_FIELD_NONE,
+ .colorspace = V4L2_COLORSPACE_SRGB,
+ .quantization = V4L2_QUANTIZATION_FULL_RANGE,
+ .xfer_func = V4L2_XFER_FUNC_SRGB,
+};
+
+static int vimc_sca_init_cfg(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg)
+{
+ struct v4l2_mbus_framefmt *mf;
+ unsigned int i;
+
+ mf = v4l2_subdev_get_try_format(sd, cfg, 0);
+ *mf = sink_fmt_default;
+
+ for (i = 1; i < sd->entity.num_pads; i++) {
+ mf = v4l2_subdev_get_try_format(sd, cfg, i);
+ *mf = sink_fmt_default;
+ mf->width = mf->width * sca_mult;
+ mf->height = mf->height * sca_mult;
+ }
+
+ return 0;
+}
+
+static int vimc_sca_enum_mbus_code(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_mbus_code_enum *code)
+{
+ const struct vimc_pix_map *vpix = vimc_pix_map_by_index(code->index);
+
+ /* We don't support bayer format */
+ if (!vpix || vpix->bayer)
+ return -EINVAL;
+
+ code->code = vpix->code;
+
+ return 0;
+}
+
+static int vimc_sca_enum_frame_size(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ 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;
+
+ if (IS_SINK(fse->pad)) {
+ fse->max_width = VIMC_FRAME_MAX_WIDTH;
+ fse->max_height = VIMC_FRAME_MAX_HEIGHT;
+ } else {
+ fse->max_width = VIMC_FRAME_MAX_WIDTH * MAX_ZOOM;
+ fse->max_height = VIMC_FRAME_MAX_HEIGHT * MAX_ZOOM;
+ }
+
+ return 0;
+}
+
+static int vimc_sca_get_fmt(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *format)
+{
+ struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
+
+ /* Get the current sink format */
+ format->format = (format->which == V4L2_SUBDEV_FORMAT_TRY) ?
+ *v4l2_subdev_get_try_format(sd, cfg, 0) :
+ vsca->sink_fmt;
+
+ /* Scale the frame size for the source pad */
+ if (IS_SRC(format->pad)) {
+ format->format.width = vsca->sink_fmt.width * sca_mult;
+ format->format.height = vsca->sink_fmt.height * sca_mult;
+ }
+
+ return 0;
+}
+
+static void vimc_sca_adjust_sink_fmt(struct v4l2_mbus_framefmt *fmt)
+{
+ const struct vimc_pix_map *vpix;
+
+ /* Only accept code in the pix map table in non bayer format */
+ vpix = vimc_pix_map_by_code(fmt->code);
+ if (!vpix || vpix->bayer)
+ fmt->code = sink_fmt_default.code;
+
+ fmt->width = clamp_t(u32, fmt->width, VIMC_FRAME_MIN_WIDTH,
+ VIMC_FRAME_MAX_WIDTH);
+ fmt->height = clamp_t(u32, fmt->height, VIMC_FRAME_MIN_HEIGHT,
+ VIMC_FRAME_MAX_HEIGHT);
+
+ if (fmt->field == V4L2_FIELD_ANY)
+ fmt->field = sink_fmt_default.field;
+
+ /* Check if values are out of range */
+ if (fmt->colorspace == V4L2_COLORSPACE_DEFAULT
+ || fmt->colorspace > V4L2_COLORSPACE_DCI_P3)
+ fmt->colorspace = sink_fmt_default.colorspace;
+ if (fmt->ycbcr_enc == V4L2_YCBCR_ENC_DEFAULT
+ || fmt->ycbcr_enc > V4L2_YCBCR_ENC_SMPTE240M)
+ fmt->ycbcr_enc = sink_fmt_default.ycbcr_enc;
+ if (fmt->quantization == V4L2_QUANTIZATION_DEFAULT
+ || fmt->quantization > V4L2_QUANTIZATION_LIM_RANGE)
+ fmt->quantization = sink_fmt_default.quantization;
+ if (fmt->xfer_func == V4L2_XFER_FUNC_DEFAULT
+ || fmt->xfer_func > V4L2_XFER_FUNC_SMPTE2084)
+ fmt->xfer_func = sink_fmt_default.xfer_func;
+}
+
+static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *fmt)
+{
+ struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
+ struct v4l2_mbus_framefmt *sink_fmt;
+
+ if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
+ /* Do not change the format while stream is on */
+ if (vsca->src_frame)
+ return -EBUSY;
+
+ sink_fmt = &vsca->sink_fmt;
+ } else {
+ sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
+ }
+
+ /*
+ * Do not change the format of the source pad,
+ * it is propagated from the sink
+ */
+ if (IS_SRC(fmt->pad)) {
+ fmt->format = *sink_fmt;
+ fmt->format.width = sink_fmt->width * sca_mult;
+ fmt->format.height = sink_fmt->height * sca_mult;
+ } else {
+ /* Set the new format in the sink pad */
+ vimc_sca_adjust_sink_fmt(&fmt->format);
+
+ dev_dbg(vsca->sd.v4l2_dev->mdev->dev, "%s: sink format update: "
+ "old:%dx%d (0x%x, %d, %d, %d, %d) "
+ "new:%dx%d (0x%x, %d, %d, %d, %d)\n", vsca->sd.name,
+ /* old */
+ sink_fmt->width, sink_fmt->height, sink_fmt->code,
+ sink_fmt->colorspace, sink_fmt->quantization,
+ sink_fmt->xfer_func, sink_fmt->ycbcr_enc,
+ /* new */
+ fmt->format.width, fmt->format.height, fmt->format.code,
+ fmt->format.colorspace, fmt->format.quantization,
+ fmt->format.xfer_func, fmt->format.ycbcr_enc);
+
+ *sink_fmt = fmt->format;
+ }
+
+ return 0;
+}
+
+static const struct v4l2_subdev_pad_ops vimc_sca_pad_ops = {
+ .init_cfg = vimc_sca_init_cfg,
+ .enum_mbus_code = vimc_sca_enum_mbus_code,
+ .enum_frame_size = vimc_sca_enum_frame_size,
+ .get_fmt = vimc_sca_get_fmt,
+ .set_fmt = vimc_sca_set_fmt,
+};
+
+static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
+{
+ struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
+
+ if (enable) {
+ const struct vimc_pix_map *vpix;
+
+ if (vsca->src_frame)
+ return -EINVAL;
+
+ /* Save the bytes per pixel of the sink */
+ vpix = vimc_pix_map_by_code(vsca->sink_fmt.code);
+ vsca->bpp = vpix->bpp;
+
+ /* Calculate the width in bytes of the src frame */
+ vsca->src_line_size = vsca->sink_fmt.width *
+ sca_mult * vsca->bpp;
+
+ /* Calculate the frame size of the source pad */
+ vsca->src_frame_size = vsca->src_line_size *
+ vsca->sink_fmt.height * sca_mult;
+
+ /* Allocate the frame buffer. Use vmalloc to be able to
+ * allocate a large amount of memory
+ */
+ vsca->src_frame = vmalloc(vsca->src_frame_size);
+ if (!vsca->src_frame)
+ return -ENOMEM;
+
+ /* Turn the stream on in the subdevices directly connected */
+ if (vimc_pipeline_s_stream(&vsca->sd.entity, 1)) {
+ vfree(vsca->src_frame);
+ vsca->src_frame = NULL;
+ return -EINVAL;
+ }
+ } else {
+ if (!vsca->src_frame)
+ return -EINVAL;
+
+ /* Disable streaming from the pipe */
+ vimc_pipeline_s_stream(&vsca->sd.entity, 0);
+ vfree(vsca->src_frame);
+ vsca->src_frame = NULL;
+ }
+
+ return 0;
+}
+
+struct v4l2_subdev_video_ops vimc_sca_video_ops = {
+ .s_stream = vimc_sca_s_stream,
+};
+
+static const struct v4l2_subdev_ops vimc_sca_ops = {
+ .pad = &vimc_sca_pad_ops,
+ .video = &vimc_sca_video_ops,
+};
+
+static void vimc_sca_fill_pix(u8 *const ptr,
+ const u8 *const pixel,
+ const unsigned int bpp)
+{
+ unsigned int i;
+
+ /* copy the pixel to the pointer */
+ for (i = 0; i < bpp; i++)
+ ptr[i] = pixel[i];
+}
+
+static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
+ const unsigned int lin, const unsigned int col,
+ const u8 *const sink_frame)
+{
+ unsigned int i, j, index;
+ const u8 *pixel;
+
+ /* Point to the pixel value in position (lin, col) in the sink frame */
+ index = VIMC_FRAME_INDEX(lin, col,
+ vsca->sink_fmt.width,
+ vsca->bpp);
+ pixel = &sink_frame[index];
+
+ dev_dbg(vsca->sd.v4l2_dev->mdev->dev,
+ "sca: %s: --- scale_pix sink pos %dx%d, index %d ---\n",
+ vsca->sd.name, lin, col, index);
+
+ /* point to the place we are going to put the first pixel
+ * in the scaled src frame
+ */
+ index = VIMC_FRAME_INDEX(lin * sca_mult, col * sca_mult,
+ vsca->sink_fmt.width * sca_mult, vsca->bpp);
+
+ dev_dbg(vsca->sd.v4l2_dev->mdev->dev,
+ "sca: %s: scale_pix src pos %dx%d, index %d\n",
+ vsca->sd.name, lin * sca_mult, col * sca_mult, index);
+
+ /* Repeat this pixel mult times */
+ for (i = 0; i < sca_mult; i++) {
+ /* Iterate though each beginning of a
+ * pixel repetition in a line
+ */
+ for (j = 0; j < sca_mult * vsca->bpp; j += vsca->bpp) {
+ dev_dbg(vsca->sd.v4l2_dev->mdev->dev,
+ "sca: %s: sca: scale_pix src pos %d\n",
+ vsca->sd.name, index + j);
+
+ /* copy the pixel to the position index + j */
+ vimc_sca_fill_pix(&vsca->src_frame[index + j],
+ pixel, vsca->bpp);
+ }
+
+ /* move the index to the next line */
+ index += vsca->src_line_size;
+ }
+}
+
+static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca,
+ const u8 *const sink_frame)
+{
+ unsigned int i, j;
+
+ /* Scale each pixel from the original sink frame */
+ /* TODO: implement scale down, only scale up is supported for now */
+ for (i = 0; i < vsca->sink_fmt.height; i++)
+ for (j = 0; j < vsca->sink_fmt.width; j++)
+ vimc_sca_scale_pix(vsca, i, j, sink_frame);
+}
+
+static void vimc_sca_process_frame(struct vimc_ent_device *ved,
+ struct media_pad *sink,
+ const void *sink_frame)
+{
+ struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
+ ved);
+ unsigned int i;
+
+ /* If the stream in this node is not active, just return */
+ if (!vsca->src_frame)
+ return;
+
+ vimc_sca_fill_src_frame(vsca, sink_frame);
+
+ /* Propagate the frame thought all source pads */
+ for (i = 1; i < vsca->sd.entity.num_pads; i++) {
+ struct media_pad *pad = &vsca->sd.entity.pads[i];
+
+ vimc_propagate_frame(pad, vsca->src_frame);
+ }
+};
+
+static void vimc_sca_destroy(struct vimc_ent_device *ved)
+{
+ struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
+ ved);
+
+ vimc_ent_sd_unregister(ved, &vsca->sd);
+ kfree(vsca);
+}
+
+struct vimc_ent_device *vimc_sca_create(struct v4l2_device *v4l2_dev,
+ const char *const name,
+ u16 num_pads,
+ const unsigned long *pads_flag)
+{
+ struct vimc_sca_device *vsca;
+ unsigned int i;
+ int ret;
+
+ /* check pads types
+ * NOTE: we support a single sink pad and multiple source pads
+ * the sink pad must be the first
+ */
+ if (num_pads < 2 || !(pads_flag[0] & MEDIA_PAD_FL_SINK))
+ return ERR_PTR(-EINVAL);
+
+ /* check if the rest of pads are sources */
+ for (i = 1; i < num_pads; i++)
+ if (!(pads_flag[i] & MEDIA_PAD_FL_SOURCE))
+ return ERR_PTR(-EINVAL);
+
+ /* Allocate the vsca struct */
+ vsca = kzalloc(sizeof(*vsca), GFP_KERNEL);
+ if (!vsca)
+ return ERR_PTR(-ENOMEM);
+
+ /* Initialize ved and sd */
+ ret = vimc_ent_sd_register(&vsca->ved, &vsca->sd, v4l2_dev, name,
+ MEDIA_ENT_F_ATV_DECODER, num_pads, pads_flag,
+ &vimc_sca_ops, vimc_sca_destroy);
+ if (ret) {
+ kfree(vsca);
+ return ERR_PTR(ret);
+ }
+
+ /* Initialize the frame format */
+ vsca->sink_fmt = sink_fmt_default;
+
+ /* Set the process frame callback */
+ vsca->ved.process_frame = vimc_sca_process_frame;
+
+ return &vsca->ved;
+}
diff --git a/drivers/media/platform/vimc/vimc-scaler.h b/drivers/media/platform/vimc/vimc-scaler.h
new file mode 100644
index 0000000..e52ad1e
--- /dev/null
+++ b/drivers/media/platform/vimc/vimc-scaler.h
@@ -0,0 +1,28 @@
+/*
+ * vimc-scaler.h Virtual Media Controller Driver
+ *
+ * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@xxxxxxxxx>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _VIMC_SCALER_H_
+#define _VIMC_SCALER_H_
+
+#include "vimc-core.h"
+
+struct vimc_ent_device *vimc_sca_create(struct v4l2_device *v4l2_dev,
+ const char *const name,
+ u16 num_pads,
+ const unsigned long *pads_flag);
+
+#endif
--
2.7.4
