diff options
Diffstat (limited to 'drivers/media/platform/vimc/vimc-debayer.c')
| -rw-r--r-- | drivers/media/platform/vimc/vimc-debayer.c | 585 |
1 files changed, 585 insertions, 0 deletions
diff --git a/drivers/media/platform/vimc/vimc-debayer.c b/drivers/media/platform/vimc/vimc-debayer.c new file mode 100644 index 000000000..7d77c63b9 --- /dev/null +++ b/drivers/media/platform/vimc/vimc-debayer.c @@ -0,0 +1,585 @@ +/* + * vimc-debayer.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/mod_devicetable.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_DEB_DRV_NAME "vimc-debayer" + +static unsigned int deb_mean_win_size = 3; +module_param(deb_mean_win_size, uint, 0000); +MODULE_PARM_DESC(deb_mean_win_size, " the window size to calculate the mean.\n" + "NOTE: the window size need to be an odd number, as the main pixel " + "stays in the center of the window, otherwise the next odd number " + "is considered"); + +#define IS_SINK(pad) (!pad) +#define IS_SRC(pad) (pad) + +enum vimc_deb_rgb_colors { + VIMC_DEB_RED = 0, + VIMC_DEB_GREEN = 1, + VIMC_DEB_BLUE = 2, +}; + +struct vimc_deb_pix_map { + u32 code; + enum vimc_deb_rgb_colors order[2][2]; +}; + +struct vimc_deb_device { + struct vimc_ent_device ved; + struct v4l2_subdev sd; + struct device *dev; + /* The active format */ + struct v4l2_mbus_framefmt sink_fmt; + u32 src_code; + void (*set_rgb_src)(struct vimc_deb_device *vdeb, unsigned int lin, + unsigned int col, unsigned int rgb[3]); + /* Values calculated when the stream starts */ + u8 *src_frame; + const struct vimc_deb_pix_map *sink_pix_map; + unsigned int sink_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 const struct vimc_deb_pix_map vimc_deb_pix_map_list[] = { + { + .code = MEDIA_BUS_FMT_SBGGR8_1X8, + .order = { { VIMC_DEB_BLUE, VIMC_DEB_GREEN }, + { VIMC_DEB_GREEN, VIMC_DEB_RED } } + }, + { + .code = MEDIA_BUS_FMT_SGBRG8_1X8, + .order = { { VIMC_DEB_GREEN, VIMC_DEB_BLUE }, + { VIMC_DEB_RED, VIMC_DEB_GREEN } } + }, + { + .code = MEDIA_BUS_FMT_SGRBG8_1X8, + .order = { { VIMC_DEB_GREEN, VIMC_DEB_RED }, + { VIMC_DEB_BLUE, VIMC_DEB_GREEN } } + }, + { + .code = MEDIA_BUS_FMT_SRGGB8_1X8, + .order = { { VIMC_DEB_RED, VIMC_DEB_GREEN }, + { VIMC_DEB_GREEN, VIMC_DEB_BLUE } } + }, + { + .code = MEDIA_BUS_FMT_SBGGR10_1X10, + .order = { { VIMC_DEB_BLUE, VIMC_DEB_GREEN }, + { VIMC_DEB_GREEN, VIMC_DEB_RED } } + }, + { + .code = MEDIA_BUS_FMT_SGBRG10_1X10, + .order = { { VIMC_DEB_GREEN, VIMC_DEB_BLUE }, + { VIMC_DEB_RED, VIMC_DEB_GREEN } } + }, + { + .code = MEDIA_BUS_FMT_SGRBG10_1X10, + .order = { { VIMC_DEB_GREEN, VIMC_DEB_RED }, + { VIMC_DEB_BLUE, VIMC_DEB_GREEN } } + }, + { + .code = MEDIA_BUS_FMT_SRGGB10_1X10, + .order = { { VIMC_DEB_RED, VIMC_DEB_GREEN }, + { VIMC_DEB_GREEN, VIMC_DEB_BLUE } } + }, + { + .code = MEDIA_BUS_FMT_SBGGR12_1X12, + .order = { { VIMC_DEB_BLUE, VIMC_DEB_GREEN }, + { VIMC_DEB_GREEN, VIMC_DEB_RED } } + }, + { + .code = MEDIA_BUS_FMT_SGBRG12_1X12, + .order = { { VIMC_DEB_GREEN, VIMC_DEB_BLUE }, + { VIMC_DEB_RED, VIMC_DEB_GREEN } } + }, + { + .code = MEDIA_BUS_FMT_SGRBG12_1X12, + .order = { { VIMC_DEB_GREEN, VIMC_DEB_RED }, + { VIMC_DEB_BLUE, VIMC_DEB_GREEN } } + }, + { + .code = MEDIA_BUS_FMT_SRGGB12_1X12, + .order = { { VIMC_DEB_RED, VIMC_DEB_GREEN }, + { VIMC_DEB_GREEN, VIMC_DEB_BLUE } } + }, +}; + +static const struct vimc_deb_pix_map *vimc_deb_pix_map_by_code(u32 code) +{ + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(vimc_deb_pix_map_list); i++) + if (vimc_deb_pix_map_list[i].code == code) + return &vimc_deb_pix_map_list[i]; + + return NULL; +} + +static int vimc_deb_init_cfg(struct v4l2_subdev *sd, + struct v4l2_subdev_pad_config *cfg) +{ + struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd); + 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->code = vdeb->src_code; + } + + return 0; +} + +static int vimc_deb_enum_mbus_code(struct v4l2_subdev *sd, + struct v4l2_subdev_pad_config *cfg, + struct v4l2_subdev_mbus_code_enum *code) +{ + /* We only support one format for source pads */ + if (IS_SRC(code->pad)) { + struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd); + + if (code->index) + return -EINVAL; + + code->code = vdeb->src_code; + } else { + if (code->index >= ARRAY_SIZE(vimc_deb_pix_map_list)) + return -EINVAL; + + code->code = vimc_deb_pix_map_list[code->index].code; + } + + return 0; +} + +static int vimc_deb_enum_frame_size(struct v4l2_subdev *sd, + struct v4l2_subdev_pad_config *cfg, + struct v4l2_subdev_frame_size_enum *fse) +{ + struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd); + + if (fse->index) + return -EINVAL; + + if (IS_SINK(fse->pad)) { + const struct vimc_deb_pix_map *vpix = + vimc_deb_pix_map_by_code(fse->code); + + if (!vpix) + return -EINVAL; + } else if (fse->code != vdeb->src_code) { + return -EINVAL; + } + + fse->min_width = VIMC_FRAME_MIN_WIDTH; + fse->max_width = VIMC_FRAME_MAX_WIDTH; + fse->min_height = VIMC_FRAME_MIN_HEIGHT; + fse->max_height = VIMC_FRAME_MAX_HEIGHT; + + return 0; +} + +static int vimc_deb_get_fmt(struct v4l2_subdev *sd, + struct v4l2_subdev_pad_config *cfg, + struct v4l2_subdev_format *fmt) +{ + struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd); + + /* Get the current sink format */ + fmt->format = fmt->which == V4L2_SUBDEV_FORMAT_TRY ? + *v4l2_subdev_get_try_format(sd, cfg, 0) : + vdeb->sink_fmt; + + /* Set the right code for the source pad */ + if (IS_SRC(fmt->pad)) + fmt->format.code = vdeb->src_code; + + return 0; +} + +static void vimc_deb_adjust_sink_fmt(struct v4l2_mbus_framefmt *fmt) +{ + const struct vimc_deb_pix_map *vpix; + + /* Don't accept a code that is not on the debayer table */ + vpix = vimc_deb_pix_map_by_code(fmt->code); + if (!vpix) + 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_deb_set_fmt(struct v4l2_subdev *sd, + struct v4l2_subdev_pad_config *cfg, + struct v4l2_subdev_format *fmt) +{ + struct vimc_deb_device *vdeb = 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 (vdeb->src_frame) + return -EBUSY; + + sink_fmt = &vdeb->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; + /* TODO: Add support for other formats */ + fmt->format.code = vdeb->src_code; + } else { + /* Set the new format in the sink pad */ + vimc_deb_adjust_sink_fmt(&fmt->format); + + dev_dbg(vdeb->dev, "%s: sink format update: " + "old:%dx%d (0x%x, %d, %d, %d, %d) " + "new:%dx%d (0x%x, %d, %d, %d, %d)\n", vdeb->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_deb_pad_ops = { + .init_cfg = vimc_deb_init_cfg, + .enum_mbus_code = vimc_deb_enum_mbus_code, + .enum_frame_size = vimc_deb_enum_frame_size, + .get_fmt = vimc_deb_get_fmt, + .set_fmt = vimc_deb_set_fmt, +}; + +static void vimc_deb_set_rgb_mbus_fmt_rgb888_1x24(struct vimc_deb_device *vdeb, + unsigned int lin, + unsigned int col, + unsigned int rgb[3]) +{ + unsigned int i, index; + + index = VIMC_FRAME_INDEX(lin, col, vdeb->sink_fmt.width, 3); + for (i = 0; i < 3; i++) + vdeb->src_frame[index + i] = rgb[i]; +} + +static int vimc_deb_s_stream(struct v4l2_subdev *sd, int enable) +{ + struct vimc_deb_device *vdeb = v4l2_get_subdevdata(sd); + + if (enable) { + const struct vimc_pix_map *vpix; + unsigned int frame_size; + + if (vdeb->src_frame) + return 0; + + /* Calculate the frame size of the source pad */ + vpix = vimc_pix_map_by_code(vdeb->src_code); + frame_size = vdeb->sink_fmt.width * vdeb->sink_fmt.height * + vpix->bpp; + + /* Save the bytes per pixel of the sink */ + vpix = vimc_pix_map_by_code(vdeb->sink_fmt.code); + vdeb->sink_bpp = vpix->bpp; + + /* Get the corresponding pixel map from the table */ + vdeb->sink_pix_map = + vimc_deb_pix_map_by_code(vdeb->sink_fmt.code); + + /* + * Allocate the frame buffer. Use vmalloc to be able to + * allocate a large amount of memory + */ + vdeb->src_frame = vmalloc(frame_size); + if (!vdeb->src_frame) + return -ENOMEM; + + } else { + if (!vdeb->src_frame) + return 0; + + vfree(vdeb->src_frame); + vdeb->src_frame = NULL; + } + + return 0; +} + +static const struct v4l2_subdev_video_ops vimc_deb_video_ops = { + .s_stream = vimc_deb_s_stream, +}; + +static const struct v4l2_subdev_ops vimc_deb_ops = { + .pad = &vimc_deb_pad_ops, + .video = &vimc_deb_video_ops, +}; + +static unsigned int vimc_deb_get_val(const u8 *bytes, + const unsigned int n_bytes) +{ + unsigned int i; + unsigned int acc = 0; + + for (i = 0; i < n_bytes; i++) + acc = acc + (bytes[i] << (8 * i)); + + return acc; +} + +static void vimc_deb_calc_rgb_sink(struct vimc_deb_device *vdeb, + const u8 *frame, + const unsigned int lin, + const unsigned int col, + unsigned int rgb[3]) +{ + unsigned int i, seek, wlin, wcol; + unsigned int n_rgb[3] = {0, 0, 0}; + + for (i = 0; i < 3; i++) + rgb[i] = 0; + + /* + * Calculate how many we need to subtract to get to the pixel in + * the top left corner of the mean window (considering the current + * pixel as the center) + */ + seek = deb_mean_win_size / 2; + + /* Sum the values of the colors in the mean window */ + + dev_dbg(vdeb->dev, + "deb: %s: --- Calc pixel %dx%d, window mean %d, seek %d ---\n", + vdeb->sd.name, lin, col, vdeb->sink_fmt.height, seek); + + /* + * Iterate through all the lines in the mean window, start + * with zero if the pixel is outside the frame and don't pass + * the height when the pixel is in the bottom border of the + * frame + */ + for (wlin = seek > lin ? 0 : lin - seek; + wlin < lin + seek + 1 && wlin < vdeb->sink_fmt.height; + wlin++) { + + /* + * Iterate through all the columns in the mean window, start + * with zero if the pixel is outside the frame and don't pass + * the width when the pixel is in the right border of the + * frame + */ + for (wcol = seek > col ? 0 : col - seek; + wcol < col + seek + 1 && wcol < vdeb->sink_fmt.width; + wcol++) { + enum vimc_deb_rgb_colors color; + unsigned int index; + + /* Check which color this pixel is */ + color = vdeb->sink_pix_map->order[wlin % 2][wcol % 2]; + + index = VIMC_FRAME_INDEX(wlin, wcol, + vdeb->sink_fmt.width, + vdeb->sink_bpp); + + dev_dbg(vdeb->dev, + "deb: %s: RGB CALC: frame index %d, win pos %dx%d, color %d\n", + vdeb->sd.name, index, wlin, wcol, color); + + /* Get its value */ + rgb[color] = rgb[color] + + vimc_deb_get_val(&frame[index], vdeb->sink_bpp); + + /* Save how many values we already added */ + n_rgb[color]++; + + dev_dbg(vdeb->dev, "deb: %s: RGB CALC: val %d, n %d\n", + vdeb->sd.name, rgb[color], n_rgb[color]); + } + } + + /* Calculate the mean */ + for (i = 0; i < 3; i++) { + dev_dbg(vdeb->dev, + "deb: %s: PRE CALC: %dx%d Color %d, val %d, n %d\n", + vdeb->sd.name, lin, col, i, rgb[i], n_rgb[i]); + + if (n_rgb[i]) + rgb[i] = rgb[i] / n_rgb[i]; + + dev_dbg(vdeb->dev, + "deb: %s: FINAL CALC: %dx%d Color %d, val %d\n", + vdeb->sd.name, lin, col, i, rgb[i]); + } +} + +static void *vimc_deb_process_frame(struct vimc_ent_device *ved, + const void *sink_frame) +{ + struct vimc_deb_device *vdeb = container_of(ved, struct vimc_deb_device, + ved); + unsigned int rgb[3]; + unsigned int i, j; + + /* If the stream in this node is not active, just return */ + if (!vdeb->src_frame) + return ERR_PTR(-EINVAL); + + for (i = 0; i < vdeb->sink_fmt.height; i++) + for (j = 0; j < vdeb->sink_fmt.width; j++) { + vimc_deb_calc_rgb_sink(vdeb, sink_frame, i, j, rgb); + vdeb->set_rgb_src(vdeb, i, j, rgb); + } + + return vdeb->src_frame; + +} + +static void vimc_deb_comp_unbind(struct device *comp, struct device *master, + void *master_data) +{ + struct vimc_ent_device *ved = dev_get_drvdata(comp); + struct vimc_deb_device *vdeb = container_of(ved, struct vimc_deb_device, + ved); + + vimc_ent_sd_unregister(ved, &vdeb->sd); + kfree(vdeb); +} + +static int vimc_deb_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_deb_device *vdeb; + int ret; + + /* Allocate the vdeb struct */ + vdeb = kzalloc(sizeof(*vdeb), GFP_KERNEL); + if (!vdeb) + return -ENOMEM; + + /* Initialize ved and sd */ + ret = vimc_ent_sd_register(&vdeb->ved, &vdeb->sd, v4l2_dev, + pdata->entity_name, + MEDIA_ENT_F_PROC_VIDEO_PIXEL_ENC_CONV, 2, + (const unsigned long[2]) {MEDIA_PAD_FL_SINK, + MEDIA_PAD_FL_SOURCE}, + &vimc_deb_ops); + if (ret) { + kfree(vdeb); + return ret; + } + + vdeb->ved.process_frame = vimc_deb_process_frame; + dev_set_drvdata(comp, &vdeb->ved); + vdeb->dev = comp; + + /* Initialize the frame format */ + vdeb->sink_fmt = sink_fmt_default; + /* + * TODO: Add support for more output formats, we only support + * RGB888 for now + * NOTE: the src format is always the same as the sink, except + * for the code + */ + vdeb->src_code = MEDIA_BUS_FMT_RGB888_1X24; + vdeb->set_rgb_src = vimc_deb_set_rgb_mbus_fmt_rgb888_1x24; + + return 0; +} + +static const struct component_ops vimc_deb_comp_ops = { + .bind = vimc_deb_comp_bind, + .unbind = vimc_deb_comp_unbind, +}; + +static int vimc_deb_probe(struct platform_device *pdev) +{ + return component_add(&pdev->dev, &vimc_deb_comp_ops); +} + +static int vimc_deb_remove(struct platform_device *pdev) +{ + component_del(&pdev->dev, &vimc_deb_comp_ops); + + return 0; +} + +static const struct platform_device_id vimc_deb_driver_ids[] = { + { + .name = VIMC_DEB_DRV_NAME, + }, + { } +}; + +static struct platform_driver vimc_deb_pdrv = { + .probe = vimc_deb_probe, + .remove = vimc_deb_remove, + .id_table = vimc_deb_driver_ids, + .driver = { + .name = VIMC_DEB_DRV_NAME, + }, +}; + +module_platform_driver(vimc_deb_pdrv); + +MODULE_DEVICE_TABLE(platform, vimc_deb_driver_ids); + +MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Debayer"); +MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>"); +MODULE_LICENSE("GPL"); |