Quelle  vimc-sensor.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * vimc-sensor.c Virtual Media Controller Driver
 *
 * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
 */

#include <linux/v4l2-mediabus.h>
#include <linux/vmalloc.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include <media/v4l2-subdev.h>
#include <media/tpg/v4l2-tpg.h>

#include "vimc-common.h"

enum vimc_sensor_osd_mode {
 VIMC_SENSOR_OSD_SHOW_ALL = 0,
 VIMC_SENSOR_OSD_SHOW_COUNTERS = 1,
 VIMC_SENSOR_OSD_SHOW_NONE = 2
};

struct vimc_sensor_device {
 struct vimc_ent_device ved;
 struct v4l2_subdev sd;
 struct tpg_data tpg;
 struct v4l2_ctrl_handler hdl;
 struct media_pad pad;

 u8 *frame;

 /*
 * Virtual "hardware" configuration, filled when the stream starts or
 * when controls are set.
 */
 struct {
  struct v4l2_area size;
  enum vimc_sensor_osd_mode osd_value;
  u64 start_stream_ts;
 } hw;
};

static const struct v4l2_mbus_framefmt fmt_default = {
 .width = 640,
 .height = 480,
 .code = MEDIA_BUS_FMT_RGB888_1X24,
 .field = V4L2_FIELD_NONE,
 .colorspace = V4L2_COLORSPACE_SRGB,
};

static int vimc_sensor_init_state(struct v4l2_subdev *sd,
      struct v4l2_subdev_state *sd_state)
{
 struct v4l2_mbus_framefmt *mf;

 mf = v4l2_subdev_state_get_format(sd_state, 0);
 *mf = fmt_default;

 return 0;
}

static int vimc_sensor_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);

 if (!mbus_code)
  return -EINVAL;

 code->code = mbus_code;

 return 0;
}

static int vimc_sensor_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 */
 vpix = vimc_pix_map_by_code(fse->code);
 if (!vpix)
  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 void vimc_sensor_tpg_s_format(struct vimc_sensor_device *vsensor,
         const struct v4l2_mbus_framefmt *format)
{
 const struct vimc_pix_map *vpix = vimc_pix_map_by_code(format->code);

 tpg_reset_source(&vsensor->tpg, format->width, format->height,
    format->field);
 tpg_s_bytesperline(&vsensor->tpg, 0, format->width * vpix->bpp);
 tpg_s_buf_height(&vsensor->tpg, format->height);
 tpg_s_fourcc(&vsensor->tpg, vpix->pixelformat);
 /* TODO: add support for V4L2_FIELD_ALTERNATE */
 tpg_s_field(&vsensor->tpg, format->field, false);
 tpg_s_colorspace(&vsensor->tpg, format->colorspace);
 tpg_s_ycbcr_enc(&vsensor->tpg, format->ycbcr_enc);
 tpg_s_quantization(&vsensor->tpg, format->quantization);
 tpg_s_xfer_func(&vsensor->tpg, format->xfer_func);
}

static void vimc_sensor_adjust_fmt(struct v4l2_mbus_framefmt *fmt)
{
 const struct vimc_pix_map *vpix;

 /* Only accept code in the pix map table */
 vpix = vimc_pix_map_by_code(fmt->code);
 if (!vpix)
  fmt->code = 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;

 /* TODO: add support for V4L2_FIELD_ALTERNATE */
 if (fmt->field == V4L2_FIELD_ANY || fmt->field == V4L2_FIELD_ALTERNATE)
  fmt->field = fmt_default.field;

 vimc_colorimetry_clamp(fmt);
}

static int vimc_sensor_set_fmt(struct v4l2_subdev *sd,
          struct v4l2_subdev_state *sd_state,
          struct v4l2_subdev_format *fmt)
{
 struct vimc_sensor_device *vsensor = v4l2_get_subdevdata(sd);
 struct v4l2_mbus_framefmt *mf;

 /* Do not change the format while stream is on */
 if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE && vsensor->frame)
  return -EBUSY;

 mf = v4l2_subdev_state_get_format(sd_state, fmt->pad);

 /* Set the new format */
 vimc_sensor_adjust_fmt(&fmt->format);

 dev_dbg(vsensor->ved.dev, "%s: format update: "
  "old:%dx%d (0x%x, %d, %d, %d, %d) "
  "new:%dx%d (0x%x, %d, %d, %d, %d)\n", vsensor->sd.name,
  /* old */
  mf->width, mf->height, mf->code,
  mf->colorspace, mf->quantization,
  mf->xfer_func, mf->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);

 *mf = fmt->format;

 return 0;
}

static const struct v4l2_subdev_pad_ops vimc_sensor_pad_ops = {
 .enum_mbus_code  = vimc_sensor_enum_mbus_code,
 .enum_frame_size = vimc_sensor_enum_frame_size,
 .get_fmt  = v4l2_subdev_get_fmt,
 .set_fmt  = vimc_sensor_set_fmt,
};

static void *vimc_sensor_process_frame(struct vimc_ent_device *ved,
           const void *sink_frame)
{
 struct vimc_sensor_device *vsensor =
  container_of(ved, struct vimc_sensor_device, ved);

 const unsigned int line_height = 16;
 u8 *basep[TPG_MAX_PLANES][2];
 unsigned int line = 1;
 char str[100];

 tpg_fill_plane_buffer(&vsensor->tpg, 0, 0, vsensor->frame);
 tpg_calc_text_basep(&vsensor->tpg, basep, 0, vsensor->frame);
 switch (vsensor->hw.osd_value) {
 case VIMC_SENSOR_OSD_SHOW_ALL: {
  const char *order = tpg_g_color_order(&vsensor->tpg);

  tpg_gen_text(&vsensor->tpg, basep, line++ * line_height,
        16, order);
  snprintf(str, sizeof(str),
    "brightness %3d, contrast %3d, saturation %3d, hue %d ",
    vsensor->tpg.brightness,
    vsensor->tpg.contrast,
    vsensor->tpg.saturation,
    vsensor->tpg.hue);
  tpg_gen_text(&vsensor->tpg, basep, line++ * line_height, 16, str);
  snprintf(str, sizeof(str), "sensor size: %dx%d",
    vsensor->hw.size.width, vsensor->hw.size.height);
  tpg_gen_text(&vsensor->tpg, basep, line++ * line_height, 16, str);
  fallthrough;
 }
 case VIMC_SENSOR_OSD_SHOW_COUNTERS: {
  unsigned int ms;

  ms = div_u64(ktime_get_ns() - vsensor->hw.start_stream_ts, 1000000);
  snprintf(str, sizeof(str), "%02d:%02d:%02d:%03d",
    (ms / (60 * 60 * 1000)) % 24,
    (ms / (60 * 1000)) % 60,
    (ms / 1000) % 60,
    ms % 1000);
  tpg_gen_text(&vsensor->tpg, basep, line++ * line_height, 16, str);
  break;
 }
 case VIMC_SENSOR_OSD_SHOW_NONE:
 default:
  break;
 }

 return vsensor->frame;
}

static int vimc_sensor_s_stream(struct v4l2_subdev *sd, int enable)
{
 struct vimc_sensor_device *vsensor =
    container_of(sd, struct vimc_sensor_device, sd);

 if (enable) {
  const struct v4l2_mbus_framefmt *format;
  struct v4l2_subdev_state *state;
  const struct vimc_pix_map *vpix;
  unsigned int frame_size;

  state = v4l2_subdev_lock_and_get_active_state(sd);
  format = v4l2_subdev_state_get_format(state, 0);

  /* Configure the test pattern generator. */
  vimc_sensor_tpg_s_format(vsensor, format);

  /* Calculate the frame size. */
  vpix = vimc_pix_map_by_code(format->code);
  frame_size = format->width * vpix->bpp * format->height;

  vsensor->hw.size.width = format->width;
  vsensor->hw.size.height = format->height;

  v4l2_subdev_unlock_state(state);

  /*
 * Allocate the frame buffer. Use vmalloc to be able to
 * allocate a large amount of memory
 */
  vsensor->frame = vmalloc(frame_size);
  if (!vsensor->frame)
   return -ENOMEM;

  vsensor->hw.start_stream_ts = ktime_get_ns();
 } else {

  vfree(vsensor->frame);
  vsensor->frame = NULL;
 }

 return 0;
}

static const struct v4l2_subdev_core_ops vimc_sensor_core_ops = {
 .log_status = v4l2_ctrl_subdev_log_status,
 .subscribe_event = v4l2_ctrl_subdev_subscribe_event,
 .unsubscribe_event = v4l2_event_subdev_unsubscribe,
};

static const struct v4l2_subdev_video_ops vimc_sensor_video_ops = {
 .s_stream = vimc_sensor_s_stream,
};

static const struct v4l2_subdev_ops vimc_sensor_ops = {
 .core = &vimc_sensor_core_ops,
 .pad = &vimc_sensor_pad_ops,
 .video = &vimc_sensor_video_ops,
};

static const struct v4l2_subdev_internal_ops vimc_sensor_internal_ops = {
 .init_state = vimc_sensor_init_state,
};

static int vimc_sensor_s_ctrl(struct v4l2_ctrl *ctrl)
{
 struct vimc_sensor_device *vsensor =
  container_of(ctrl->handler, struct vimc_sensor_device, hdl);

 switch (ctrl->id) {
 case VIMC_CID_TEST_PATTERN:
  tpg_s_pattern(&vsensor->tpg, ctrl->val);
  break;
 case V4L2_CID_HFLIP:
  tpg_s_hflip(&vsensor->tpg, ctrl->val);
  break;
 case V4L2_CID_VFLIP:
  tpg_s_vflip(&vsensor->tpg, ctrl->val);
  break;
 case V4L2_CID_BRIGHTNESS:
  tpg_s_brightness(&vsensor->tpg, ctrl->val);
  break;
 case V4L2_CID_CONTRAST:
  tpg_s_contrast(&vsensor->tpg, ctrl->val);
  break;
 case V4L2_CID_HUE:
  tpg_s_hue(&vsensor->tpg, ctrl->val);
  break;
 case V4L2_CID_SATURATION:
  tpg_s_saturation(&vsensor->tpg, ctrl->val);
  break;
 case VIMC_CID_OSD_TEXT_MODE:
  vsensor->hw.osd_value = ctrl->val;
  break;
 default:
  return -EINVAL;
 }
 return 0;
}

static const struct v4l2_ctrl_ops vimc_sensor_ctrl_ops = {
 .s_ctrl = vimc_sensor_s_ctrl,
};

static void vimc_sensor_release(struct vimc_ent_device *ved)
{
 struct vimc_sensor_device *vsensor =
  container_of(ved, struct vimc_sensor_device, ved);

 v4l2_ctrl_handler_free(&vsensor->hdl);
 tpg_free(&vsensor->tpg);
 v4l2_subdev_cleanup(&vsensor->sd);
 media_entity_cleanup(vsensor->ved.ent);
 kfree(vsensor);
}

/* Image Processing Controls */
static const struct v4l2_ctrl_config vimc_sensor_ctrl_class = {
 .flags = V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY,
 .id = VIMC_CID_VIMC_CLASS,
 .name = "VIMC Controls",
 .type = V4L2_CTRL_TYPE_CTRL_CLASS,
};

static const struct v4l2_ctrl_config vimc_sensor_ctrl_test_pattern = {
 .ops = &vimc_sensor_ctrl_ops,
 .id = VIMC_CID_TEST_PATTERN,
 .name = "Test Pattern",
 .type = V4L2_CTRL_TYPE_MENU,
 .max = TPG_PAT_NOISE,
 .qmenu = tpg_pattern_strings,
};

static const char * const vimc_ctrl_osd_mode_strings[] = {
 "All",
 "Counters Only",
 "None",
 NULL,
};

static const struct v4l2_ctrl_config vimc_sensor_ctrl_osd_mode = {
 .ops = &vimc_sensor_ctrl_ops,
 .id = VIMC_CID_OSD_TEXT_MODE,
 .name = "Show Information",
 .type = V4L2_CTRL_TYPE_MENU,
 .max = ARRAY_SIZE(vimc_ctrl_osd_mode_strings) - 2,
 .qmenu = vimc_ctrl_osd_mode_strings,
};

static struct vimc_ent_device *vimc_sensor_add(struct vimc_device *vimc,
            const char *vcfg_name)
{
 struct v4l2_device *v4l2_dev = &vimc->v4l2_dev;
 struct vimc_sensor_device *vsensor;
 int ret;

 /* Allocate the vsensor struct */
 vsensor = kzalloc(sizeof(*vsensor), GFP_KERNEL);
 if (!vsensor)
  return ERR_PTR(-ENOMEM);

 v4l2_ctrl_handler_init(&vsensor->hdl, 4);

 v4l2_ctrl_new_custom(&vsensor->hdl, &vimc_sensor_ctrl_class, NULL);
 v4l2_ctrl_new_custom(&vsensor->hdl, &vimc_sensor_ctrl_test_pattern, NULL);
 v4l2_ctrl_new_custom(&vsensor->hdl, &vimc_sensor_ctrl_osd_mode, NULL);
 v4l2_ctrl_new_std(&vsensor->hdl, &vimc_sensor_ctrl_ops,
     V4L2_CID_VFLIP, 0, 1, 1, 0);
 v4l2_ctrl_new_std(&vsensor->hdl, &vimc_sensor_ctrl_ops,
     V4L2_CID_HFLIP, 0, 1, 1, 0);
 v4l2_ctrl_new_std(&vsensor->hdl, &vimc_sensor_ctrl_ops,
     V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
 v4l2_ctrl_new_std(&vsensor->hdl, &vimc_sensor_ctrl_ops,
     V4L2_CID_CONTRAST, 0, 255, 1, 128);
 v4l2_ctrl_new_std(&vsensor->hdl, &vimc_sensor_ctrl_ops,
     V4L2_CID_HUE, -128, 127, 1, 0);
 v4l2_ctrl_new_std(&vsensor->hdl, &vimc_sensor_ctrl_ops,
     V4L2_CID_SATURATION, 0, 255, 1, 128);
 vsensor->sd.ctrl_handler = &vsensor->hdl;
 if (vsensor->hdl.error) {
  ret = vsensor->hdl.error;
  goto err_free_vsensor;
 }

 /* Initialize the test pattern generator */
 tpg_init(&vsensor->tpg, fmt_default.width, fmt_default.height);
 ret = tpg_alloc(&vsensor->tpg, VIMC_FRAME_MAX_WIDTH);
 if (ret)
  goto err_free_hdl;

 /* Initialize ved and sd */
 vsensor->pad.flags = MEDIA_PAD_FL_SOURCE;
 ret = vimc_ent_sd_register(&vsensor->ved, &vsensor->sd, v4l2_dev,
       vcfg_name,
       MEDIA_ENT_F_CAM_SENSOR, 1, &vsensor->pad,
       &vimc_sensor_internal_ops, &vimc_sensor_ops);
 if (ret)
  goto err_free_tpg;

 vsensor->ved.process_frame = vimc_sensor_process_frame;
 vsensor->ved.dev = vimc->mdev.dev;

 return &vsensor->ved;

err_free_tpg:
 tpg_free(&vsensor->tpg);
err_free_hdl:
 v4l2_ctrl_handler_free(&vsensor->hdl);
err_free_vsensor:
 kfree(vsensor);

 return ERR_PTR(ret);
}

const struct vimc_ent_type vimc_sensor_type = {
 .add = vimc_sensor_add,
 .release = vimc_sensor_release
};