/****************************************************************************
 * drivers/lcd/lcd_framebuffer.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>

#include <nuttx/board.h>
#include <nuttx/kmalloc.h>
#include <nuttx/lcd/lcd.h>
#include <nuttx/video/fb.h>

#ifdef CONFIG_LCD_FRAMEBUFFER

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/* At present, only video plane 0 is supported */

#define VIDEO_PLANE 0

/****************************************************************************
 * Private Types
 ****************************************************************************/

/* This structure describes the LCD framebuffer */

struct lcdfb_dev_s
{
  struct fb_vtable_s vtable;        /* Must be cast compatible with lcdfb_dev_s */
  FAR struct lcdfb_dev_s *flink;    /* Supports a singly linked list */
  FAR struct lcd_dev_s *lcd;        /* Contained LCD device */
  FAR uint8_t *fbmem;               /* Allocated framebuffer */
  FAR struct lcd_planeinfo_s pinfo; /* LCD plane info */
  size_t fblen;                     /* Size of the framebuffer in bytes */
  fb_coord_t xres;                  /* Horizontal resolution in pixel columns */
  fb_coord_t yres;                  /* Vertical resolution in pixel rows */
  fb_coord_t stride;                /* Width of a row in bytes */
  uint8_t display;                  /* Display number */
};

/****************************************************************************
 * Private Function Prototypes
 ****************************************************************************/

/* Update the LCD when there is a change to the framebuffer */

static int lcdfb_updateearea(FAR struct fb_vtable_s *vtable,
             FAR const struct fb_area_s *area);

/* Get information about the video controller configuration and the
 * configuration of each color plane.
 */

static int lcdfb_getvideoinfo(FAR struct fb_vtable_s *vtable,
             FAR struct fb_videoinfo_s *vinfo);
static int lcdfb_getplaneinfo(FAR struct fb_vtable_s *vtable, int planeno,
             FAR struct fb_planeinfo_s *pinfo);

/* The following is provided only if the video hardware supports RGB color
 * mapping
 */

#ifdef CONFIG_FB_CMAP
static int lcdfb_getcmap(FAR struct fb_vtable_s *vtable,
             FAR struct fb_cmap_s *cmap);
static int lcdfb_putcmap(FAR struct fb_vtable_s *vtable,
             FAR const struct fb_cmap_s *cmap);
#endif

/* The following is provided only if the video hardware supports a hardware
 * cursor
 */

#ifdef CONFIG_FB_HWCURSOR
static int lcdfb_getcursor(FAR struct fb_vtable_s *vtable,
             FAR struct fb_cursorattrib_s *attrib);
static int lcdfb_setcursor(FAR struct fb_vtable_s *vtable,
             FAR struct fb_setcursor_s *settings);
#endif

static int lcdfb_setpower(FAR struct fb_vtable_s *vtable, FAR int power);

/****************************************************************************
 * Private Data
 ****************************************************************************/

/* This is a singly linked list that supports look-up of framebuffer state
 * using the display number.
 */

static FAR struct lcdfb_dev_s *g_lcdfb;

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Name: lcdfb_find
 *
 * Description:
 *   Find the LCD framebuffer state associated with the display.
 *
 ****************************************************************************/

static FAR struct lcdfb_dev_s *lcdfb_find(int display)
{
  FAR struct lcdfb_dev_s *priv;

  /* Look up the LCD framebuffer state structure for this display.
   *
   * REVISIT:  If many LCD framebuffers are used, then this lookup would be
   * a performance issue.
   * REVISIT: Semaphore protections is needed if there is concurrent access.
   */

  for (priv = g_lcdfb; priv != NULL; priv = priv->flink)
    {
      if (priv->display == display)
        {
          return priv;
        }
    }

  return NULL;
}

/****************************************************************************
 * Name: lcdfb_updateearea
 *
 * Description:
 * Update the LCD when there is a change to the framebuffer.
 *
 ****************************************************************************/

static int lcdfb_updateearea(FAR struct fb_vtable_s *vtable,
                             FAR const struct fb_area_s *area)
{
  FAR struct lcdfb_dev_s *priv = (FAR struct lcdfb_dev_s *)vtable;
  FAR struct lcd_planeinfo_s *pinfo = &priv->pinfo;
  FAR uint8_t *run = priv->fbmem;
  fb_coord_t row;
  fb_coord_t startx = 0;
  fb_coord_t endx = priv->xres - 1;
  fb_coord_t width = priv->xres;
  fb_coord_t starty = 0;
  fb_coord_t endy = priv->yres - 1;
  int ret;

  if (area != NULL)
    {
      /* Clip to fit in the framebuffer */

      startx = area->x;
      if (startx < 0)
        {
          startx = 0;
        }

      endx = startx + area->w - 1;
      if (endx >= priv->xres)
        {
          endx = priv->xres - 1;
        }

      starty = area->y;
      if (starty < 0)
        {
          starty = 0;
        }

      endy = starty + area->h - 1;
      if (endy >= priv->yres)
        {
          endy = priv->yres - 1;
        }

      /* If the display uses a value of BPP < 8, then we may have to extend
       * the rectangle on the left so that it is byte aligned.  Works for
       * BPP={1,2,4}
       */

      if (pinfo->bpp < 8)
        {
          unsigned int pixperbyte = 8 / pinfo->bpp;
          startx &= ~(pixperbyte - 1);
        }

      /* Get the starting position in the framebuffer */

      run  = priv->fbmem + starty * priv->stride;
      run += (startx * pinfo->bpp + 7) >> 3;
    }

  if (pinfo->putarea != NULL)
    {
      /* Each Driver's callback function putarea may be optimized by checking
       * if it is a full screen/full row mode or not.
       * In case of full screen/row mode the memory layout of drivers memory
       * and data provided to putarea function may be (or not, it depends of
       * display and driver implementation) identical.
       * Identical memory layout let us to use:
       * - memcopy (if there is shadow buffer in driver implementation)
       * - apply DMA channel to transfer data to driver memory.
       */

      ret = pinfo->putarea(pinfo->dev, starty, endy, startx, endx,
                           run, priv->stride);
      if (ret < 0)
        {
          lcderr("Failed to update area");
          return ret;
        }
    }
  else
    {
      width = endx - startx + 1;

      for (row = starty; row <= endy; row++)
        {
          ret = pinfo->putrun(pinfo->dev, row, startx, run, width);
          if (ret < 0)
            {
              lcderr("Failed to update row");
              return ret;
            }

          run += priv->stride;
        }
    }

  if (pinfo->redraw != NULL)
    {
      pinfo->redraw(pinfo->dev);
    }

  return OK;
}

/****************************************************************************
 * Name: lcdfb_getvideoinfo
 ****************************************************************************/

static int lcdfb_getvideoinfo(FAR struct fb_vtable_s *vtable,
                              FAR struct fb_videoinfo_s *vinfo)
{
  FAR struct lcdfb_dev_s *priv;
  FAR struct lcd_dev_s *lcd;
  int ret = -EINVAL;

  lcdinfo("vtable=%p vinfo=%p\n", vtable, vinfo);

  DEBUGASSERT(vtable != NULL && vinfo != NULL);
  priv = (FAR struct lcdfb_dev_s *)vtable;

  if (priv != NULL && vinfo != NULL)
    {
      /* Get the video info from the contained LCD */

      lcd = priv->lcd;
      DEBUGASSERT(lcd->getvideoinfo != NULL);
      ret = lcd->getvideoinfo(lcd, vinfo);
      if (ret < 0)
        {
          lcderr("ERROR: LCD getvideoinfo() failed: %d\n", ret);
        }
    }

  return ret;
}

/****************************************************************************
 * Name: lcdfb_getplaneinfo
 ****************************************************************************/

static int lcdfb_getplaneinfo(FAR struct fb_vtable_s *vtable, int planeno,
                              FAR struct fb_planeinfo_s *pinfo)
{
  FAR struct lcdfb_dev_s *priv;
  int ret = -EINVAL;

  lcdinfo("vtable=%p planeno=%d pinfo=%p\n", vtable, planeno, pinfo);

  DEBUGASSERT(vtable != NULL && planeno == VIDEO_PLANE && pinfo != NULL);
  priv = (FAR struct lcdfb_dev_s *)vtable;

  if (priv != NULL && planeno == VIDEO_PLANE && pinfo != NULL)
    {
      /* Return the plane info */

      pinfo->fbmem   = priv->fbmem;
      pinfo->fblen   = priv->fblen;
      pinfo->stride  = priv->stride;
      pinfo->display = priv->display;
      pinfo->bpp     = priv->pinfo.bpp;

      ret = OK;
    }

  return ret;
}

/****************************************************************************
 * Name: lcdfb_getcmap
 ****************************************************************************/

#ifdef CONFIG_FB_CMAP
static int lcdfb_getcmap(FAR struct fb_vtable_s *vtable,
                         FAR struct fb_cmap_s *cmap)
{
  FAR struct lcdfb_dev_s *priv;
  FAR struct lcd_dev_s *lcd;
  int ret = -EINVAL;

  lcdinfo("vtable=%p cmap=%p\n", vtable, cmap);

  DEBUGASSERT(vtable != NULL && cmap != NULL);
  priv = (FAR struct lcdfb_dev_s *)vtable;

  if (priv != NULL && cmap != NULL)
    {
      /* Get the color map from the contained LCD */

      lcd = priv->lcd
      DEBUGASSERT(lcd->getcmap != NULL);
      ret = lcd->getcmap(lcd, cmap);
      if (ret < 0)
        {
          lcderr("ERROR: LCD getcmap() failed: %d\n", ret);
        }
    }

  return ret;
}
#endif

/****************************************************************************
 * Name: lcdfb_putcmap
 ****************************************************************************/

#ifdef CONFIG_FB_CMAP
static int lcdfb_putcmap(FAR struct fb_vtable_s *vtable,
                         FAR const struct fb_cmap_s *cmap)
{
  FAR struct lcdfb_dev_s *priv;
  FAR struct lcd_dev_s *lcd;
  int ret = -EINVAL;

  lcdinfo("vtable=%p cmap=%p\n", vtable, cmap);

  DEBUGASSERT(vtable != NULL && cmap != NULL);
  priv = (FAR struct lcdfb_dev_s *)vtable;

  if (priv != NULL && cmap != NULL)
    {
      /* Set the color map to the contained LCD */

      lcd = priv->lcd
      DEBUGASSERT(lcd->putcmap != NULL);
      ret = lcd->putcmap(lcd, cmap);
      if (ret < 0)
        {
          lcderr("ERROR: LCD putcmap() failed: %d\n", ret);
        }
    }

  return ret;
}
#endif

/****************************************************************************
 * Name: lcdfb_getcursor
 ****************************************************************************/

#ifdef CONFIG_FB_HWCURSOR
static int lcdfb_getcursor(FAR struct fb_vtable_s *vtable,
                        FAR struct fb_cursorattrib_s *attrib)
{
  lcdinfo("vtable=%p attrib=%p\n", vtable, attrib);
  FAR struct lcdfb_dev_s *priv;
  FAR struct lcd_dev_s *lcd;
  int ret = -EINVAL;

  lcdinfo("vtable=%p attrib=%p\n", vtable, attrib);

  DEBUGASSERT(vtable != NULL && attrib != NULL);
  priv = (FAR struct lcdfb_dev_s *)vtable;

  if (priv != NULL && attrib != NULL)
    {
      /* Get the cursor info from the contained LCD */

      lcd = priv->lcd
      DEBUGASSERT(lcd->getcursor != NULL);
      ret = lcd->getcursor(lcd, attrib);
      if (ret < 0)
        {
          lcderr("ERROR: LCD getcursor() failed: %d\n", ret);
        }
    }

  return ret;
}
#endif

/****************************************************************************
 * Name: lcdfb_setcursor
 ****************************************************************************/

#ifdef CONFIG_FB_HWCURSOR
static int lcdfb_setcursor(FAR struct fb_vtable_s *vtable,
                       FAR struct fb_setcursor_s *settings)
{
  FAR struct lcdfb_dev_s *priv;
  FAR struct lcd_dev_s *lcd;
  int ret = -EINVAL;

  lcdinfo("vtable=%p settings=%p\n", vtable, settings);

  DEBUGASSERT(vtable != NULL && settings != NULL);
  priv = (FAR struct lcdfb_dev_s *)vtable;

  if (priv != NULL && settings != NULL)
    {
      /* Set the cursor info to the contained LCD */

      lcd = priv->lcd
      DEBUGASSERT(lcd->setcursor != NULL);
      ret = lcd->setcursor(lcd, settings);
      if (ret < 0)
        {
          lcderr("ERROR: LCD setcursor() failed: %d\n", ret);
        }
    }

  return ret;
}
#endif

/****************************************************************************
 * Name: lcdfb_setpower
 ****************************************************************************/

static int lcdfb_setpower(FAR struct fb_vtable_s *vtable, FAR int power)
{
  int ret = -EINVAL;
  FAR struct lcdfb_dev_s *priv;
  FAR struct lcd_dev_s *lcd;

  DEBUGASSERT(vtable != NULL);

  priv = (FAR struct lcdfb_dev_s *)vtable;

  if (priv != NULL)
    {
      lcd = priv->lcd;
      DEBUGASSERT(lcd->setpower != NULL);

      ret = lcd->setpower(lcd, power);
      if (ret < 0)
        {
          lcderr("ERROR: LCD setpower() failed: %d\n", ret);
        }
    }

  return ret;
}

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: up_fbinitialize
 *
 * Description:
 *   Initialize the framebuffer video hardware associated with the display.
 *
 * Input Parameters:
 *   display - In the case of hardware with multiple displays, this
 *     specifies the display.  Normally this is zero.
 *
 * Returned Value:
 *   Zero is returned on success; a negated errno value is returned on any
 *   failure.
 *
 ****************************************************************************/

int up_fbinitialize(int display)
{
  FAR struct lcdfb_dev_s *priv;
  FAR struct lcd_dev_s *lcd;
  struct fb_videoinfo_s vinfo;
  struct fb_area_s area;
  int ret;

  lcdinfo("display=%d\n", display);
  DEBUGASSERT((unsigned)display < UINT8_MAX);

  /* Allocate the framebuffer state structure */

  priv = (FAR struct lcdfb_dev_s *)kmm_zalloc(sizeof(struct lcdfb_dev_s));
  if (priv == NULL)
    {
      lcderr("ERROR: Failed to allocate state structure\n");
      return -ENOMEM;
    }

  /* Initialize the LCD-independent fields of the state structure */

  priv->display             = display;

  priv->vtable.getvideoinfo = lcdfb_getvideoinfo,
  priv->vtable.getplaneinfo = lcdfb_getplaneinfo,
#ifdef CONFIG_FB_CMAP
  priv->vtable.getcmap      = lcdfb_getcmap,
  priv->vtable.putcmap      = lcdfb_putcmap,
#endif
#ifdef CONFIG_FB_HWCURSOR
  priv->vtable.getcursor    = lcdfb_getcursor,
  priv->vtable.setcursor    = lcdfb_setcursor,
#endif
  priv->vtable.updatearea   = lcdfb_updateearea,
  priv->vtable.setpower     = lcdfb_setpower,

#ifdef CONFIG_LCD_EXTERNINIT
  /* Use external graphics driver initialization */

  lcd = board_graphics_setup(display);
  if (lcd == NULL)
    {
      gerr("ERROR: board_graphics_setup failed, devno=%d\n", display);
      ret = -ENODEV;
      goto errout_with_state;
    }
#else
  /* Initialize the LCD device */

  ret = board_lcd_initialize();
  if (ret < 0)
    {
      lcderr("ERROR: board_lcd_initialize() failed: %d\n", ret);
      goto errout_with_state;
    }

  /* Get the device instance */

  lcd = board_lcd_getdev(display);
  if (lcd == NULL)
    {
      lcderr("ERROR: board_lcd_getdev failed, devno=%d\n", display);
      ret = -ENODEV;
      goto errout_with_lcd;
    }
#endif

  priv->lcd = lcd;

  /* Initialize the LCD-dependent fields of the state structure */

  DEBUGASSERT(lcd->getvideoinfo != NULL);
  ret = lcd->getvideoinfo(lcd, &vinfo);
  if (ret < 0)
    {
      lcderr("ERROR:  LCD getvideoinfo() failed: %d\n", ret);
      goto errout_with_lcd;
    }

  priv->xres = vinfo.xres;
  priv->yres = vinfo.yres;

  DEBUGASSERT(lcd->getplaneinfo != NULL);
  ret = lcd->getplaneinfo(lcd, VIDEO_PLANE, &priv->pinfo);
  if (ret < 0)
    {
      lcderr("ERROR: LCD getplaneinfo() failed: %d\n", ret);
      goto errout_with_lcd;
    }

  /* Allocate (and clear) the framebuffer */

  priv->stride = ((size_t)priv->xres * priv->pinfo.bpp + 7) >> 3;
  priv->fblen  = priv->stride * priv->yres;

  priv->fbmem  = (FAR uint8_t *)kmm_zalloc(priv->fblen);
  if (priv->fbmem == NULL)
    {
      lcderr("ERROR: Failed to allocate frame buffer memory\n");
      ret = -ENOMEM;
      goto errout_with_lcd;
    }

  /* Add the state structure to the list of framebuffer interfaces */

  priv->flink = g_lcdfb;
  g_lcdfb     = priv;

  /* Write the entire framebuffer to the LCD */

  area.x = 0;
  area.y = 0;
  area.w = priv->xres;
  area.h = priv->yres;

  ret = lcdfb_updateearea(&priv->vtable, &area);
  if (ret < 0)
    {
      lcderr("FB update failed: %d\n", ret);
    }

  /* Turn the LCD on at 75% power */

  priv->lcd->setpower(priv->lcd, ((3*CONFIG_LCD_MAXPOWER + 3) / 4));
  return OK;

errout_with_lcd:
#ifndef CONFIG_LCD_EXTERNINIT
  board_lcd_uninitialize();
#endif

errout_with_state:
  kmm_free(priv);
  return ret;
}

/****************************************************************************
 * Name: up_fbgetvplane
 *
 * Description:
 *   Return a a reference to the framebuffer object for the specified video
 *   plane of the specified plane.  Many OSDs support multiple planes of
 *   video.
 *
 * Input Parameters:
 *   display - In the case of hardware with multiple displays, this
 *     specifies the display.  Normally this is zero.
 *   vplane - Identifies the plane being queried.
 *
 * Returned Value:
 *   A non-NULL pointer to the frame buffer access structure is returned on
 *   success; NULL is returned on any failure.
 *
 ****************************************************************************/

FAR struct fb_vtable_s *up_fbgetvplane(int display, int vplane)
{
  FAR struct lcdfb_dev_s *priv;

  lcdinfo("display=%d vplane=%d\n", display, vplane);
  DEBUGASSERT(vplane == VIDEO_PLANE);

  /* Look up the LCD framebuffer state structure for this display. */

  priv = lcdfb_find(display);
  if (priv == NULL)
    {
      lcderr("ERROR: lcd_find(%d) failed\n", display);
      return NULL;
    }

  return &priv->vtable;
}

/****************************************************************************
 * Name: up_fbuninitialize
 *
 * Description:
 *   Uninitialize the framebuffer support for the specified display.
 *
 * Input Parameters:
 *   display - In the case of hardware with multiple displays, this
 *     specifies the display.  Normally this is zero.
 *
 * Returned Value:
 *   None
 *
 ****************************************************************************/

void up_fbuninitialize(int display)
{
  FAR struct lcdfb_dev_s *priv;
  FAR struct lcdfb_dev_s *prev;

  /* Find the LCD framebuffer state associated with this display.
   * REVISIT: Semaphore protections is needed if there is concurrent access.
   */

  for (prev = NULL, priv = g_lcdfb;
       priv != NULL;
       prev = priv, priv = priv->flink)
    {
      if (priv->display == display)
        {
          /* Remove the state structure from the list */

          if (prev != NULL)
            {
              prev->flink = priv->flink;
            }
          else
            {
              g_lcdfb = priv->flink;
            }

#ifndef CONFIG_LCD_EXTERNINIT
          /* Uninitialize the LCD */

          board_lcd_uninitialize();
#endif

          /* Free the frame buffer allocation */

          kmm_free(priv->fbmem);

          /* Free the state structure allocation */

          kmm_free(priv);
          break;
        }
    }
}

#endif /* CONFIG_LCD_FRAMEBUFFER */