1 files changed, 455 insertions, 0 deletions

diff --git a/drivers/media/platform/vimc/vimc-scaler.c b/drivers/media/platform/vimc/vimc-scaler.c
new file mode 100644
index 000000000000..fe77505d2679
--- /dev/null
+++ b/drivers/media/platform/vimc/vimc-scaler.c
@@ -0,0 +1,455 @@
+/*
+ * vimc-scaler.c Virtual Media Controller Driver
+ *
+ * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.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.
+ *
+ * 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/component.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/vmalloc.h>
+#include <linux/v4l2-mediabus.h>
+#include <media/v4l2-subdev.h>
+
+#include "vimc-common.h"
+
+#define VIMC_SCA_DRV_NAME "vimc-scaler"
+
+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;
+        struct device *dev;
+        /* 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_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_DEFAULT,
+};
+
+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) & ~1;
+        fmt->height = clamp_t(u32, fmt->height, VIMC_FRAME_MIN_HEIGHT,
+                              VIMC_FRAME_MAX_HEIGHT) & ~1;
+
+        if (fmt->field == V4L2_FIELD_ANY)
+                fmt->field = sink_fmt_default.field;
+
+        vimc_colorimetry_clamp(fmt);
+}
+
+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->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);
+        int ret;
+
+        if (enable) {
+                const struct vimc_pix_map *vpix;
+                unsigned int frame_size;
+
+                if (vsca->src_frame)
+                        return 0;
+
+                /* 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 */
+                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(frame_size);
+                if (!vsca->src_frame)
+                        return -ENOMEM;
+
+                /* Turn the stream on in the subdevices directly connected */
+                ret = vimc_pipeline_s_stream(&vsca->sd.entity, 1);
+                if (ret) {
+                        vfree(vsca->src_frame);
+                        vsca->src_frame = NULL;
+                        return ret;
+                }
+        } else {
+                if (!vsca->src_frame)
+                        return 0;
+
+                /* Disable streaming from the pipe */
+                ret = vimc_pipeline_s_stream(&vsca->sd.entity, 0);
+                if (ret)
+                        return ret;
+
+                vfree(vsca->src_frame);
+                vsca->src_frame = NULL;
+        }
+
+        return 0;
+}
+
+static 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->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->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 through each beginning of a
+                 * pixel repetition in a line
+                 */
+                for (j = 0; j < sca_mult * vsca->bpp; j += vsca->bpp) {
+                        dev_dbg(vsca->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 through 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_comp_unbind(struct device *comp, struct device *master,
+                                 void *master_data)
+{
+        struct vimc_ent_device *ved = dev_get_drvdata(comp);
+        struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
+                                                    ved);
+
+        vimc_ent_sd_unregister(ved, &vsca->sd);
+        kfree(vsca);
+}
+
+
+static int vimc_sca_comp_bind(struct device *comp, struct device *master,
+                              void *master_data)
+{
+        struct v4l2_device *v4l2_dev = master_data;
+        struct vimc_platform_data *pdata = comp->platform_data;
+        struct vimc_sca_device *vsca;
+        int ret;
+
+        /* Allocate the vsca struct */
+        vsca = kzalloc(sizeof(*vsca), GFP_KERNEL);
+        if (!vsca)
+                return -ENOMEM;
+
+        /* Initialize ved and sd */
+        ret = vimc_ent_sd_register(&vsca->ved, &vsca->sd, v4l2_dev,
+                                   pdata->entity_name,
+                                   MEDIA_ENT_F_ATV_DECODER, 2,
+                                   (const unsigned long[2]) {MEDIA_PAD_FL_SINK,
+                                   MEDIA_PAD_FL_SOURCE},
+                                   &vimc_sca_ops);
+        if (ret) {
+                kfree(vsca);
+                return ret;
+        }
+
+        vsca->ved.process_frame = vimc_sca_process_frame;
+        dev_set_drvdata(comp, &vsca->ved);
+        vsca->dev = comp;
+
+        /* Initialize the frame format */
+        vsca->sink_fmt = sink_fmt_default;
+
+        return 0;
+}
+
+static const struct component_ops vimc_sca_comp_ops = {
+        .bind = vimc_sca_comp_bind,
+        .unbind = vimc_sca_comp_unbind,
+};
+
+static int vimc_sca_probe(struct platform_device *pdev)
+{
+        return component_add(&pdev->dev, &vimc_sca_comp_ops);
+}
+
+static int vimc_sca_remove(struct platform_device *pdev)
+{
+        component_del(&pdev->dev, &vimc_sca_comp_ops);
+
+        return 0;
+}
+
+static struct platform_driver vimc_sca_pdrv = {
+        .probe          = vimc_sca_probe,
+        .remove         = vimc_sca_remove,
+        .driver         = {
+                .name   = VIMC_SCA_DRV_NAME,
+        },
+};
+
+static const struct platform_device_id vimc_sca_driver_ids[] = {
+        {
+                .name           = VIMC_SCA_DRV_NAME,
+        },
+        { }
+};
+
+module_platform_driver(vimc_sca_pdrv);
+
+MODULE_DEVICE_TABLE(platform, vimc_sca_driver_ids);
+
+MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Scaler");
+MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");
+MODULE_LICENSE("GPL");