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nuttx/drivers/video/fb.c
jianglianfang 7abd460131 fb:add select overlay FB_NO_OVERLAY 
It is expected that select_overlay can switch from overlay to main
plane.

Signed-off-by: jianglianfang <jianglianfang@xiaomi.com>
2024-08-26 16:26:53 +08:00

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/****************************************************************************
* drivers/video/fb.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.
*
****************************************************************************/
/* Framebuffer character driver */
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <debug.h>
#include <errno.h>
#include <poll.h>
#include <nuttx/kmalloc.h>
#include <nuttx/fs/fs.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/video/fb.h>
#include <nuttx/clock.h>
#include <nuttx/wdog.h>
#include <nuttx/mm/circbuf.h>
/****************************************************************************
* Pre-processor definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
struct fb_priv_s
{
/* Supports a singly linked list */
FAR struct fb_priv_s *flink;
int overlay; /* Overlay number */
/* Polling fds of waiting threads */
FAR struct pollfd *fds[CONFIG_VIDEO_FB_NPOLLWAITERS];
#ifdef CONFIG_FB_SYNC
sem_t wait;
#endif
};
struct fb_paninfo_s
{
FAR struct circbuf_s buf; /* Pan buffer queued list */
struct wdog_s wdog; /* VSync offset timer */
FAR struct fb_chardev_s *dev;
};
/* This structure defines one framebuffer device. Note that which is
* everything in this structure is constant data set up and initialization
* time. Therefore, no there is requirement for serialized access to this
* structure.
*/
struct fb_chardev_s
{
FAR struct fb_vtable_s *vtable; /* Framebuffer interface */
uint8_t plane; /* Video plan number */
clock_t vsyncoffset; /* VSync offset ticks */
FAR struct fb_priv_s *head;
FAR struct fb_paninfo_s *paninfo; /* Pan info array */
size_t paninfo_count; /* Pan info count */
};
struct fb_panelinfo_s
{
FAR void *fbmem; /* Start of frame buffer memory */
size_t fblen; /* Size of the framebuffer */
uint8_t fbcount; /* Count of frame buffer */
uint8_t bpp; /* Bits per pixel */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static FAR struct circbuf_s *fb_get_panbuf(FAR struct fb_chardev_s *fb,
int overlay);
static int fb_add_paninfo(FAR struct fb_chardev_s *fb,
FAR const union fb_paninfo_u *info,
int overlay);
static int fb_open(FAR struct file *filep);
static int fb_close(FAR struct file *filep);
static ssize_t fb_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
static ssize_t fb_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen);
static off_t fb_seek(FAR struct file *filep, off_t offset, int whence);
static int fb_ioctl(FAR struct file *filep, int cmd, unsigned long arg);
static int fb_mmap(FAR struct file *filep,
FAR struct mm_map_entry_s *map);
static int fb_poll(FAR struct file *filep, FAR struct pollfd *fds,
bool setup);
static int fb_get_panelinfo(FAR struct fb_chardev_s *fb,
FAR struct fb_panelinfo_s *panelinfo,
int overlay);
static int fb_get_planeinfo(FAR struct fb_chardev_s *fb,
FAR struct fb_planeinfo_s *pinfo,
uint8_t display);
#ifdef CONFIG_FB_SYNC
static int fb_sem_wait(FAR struct fb_chardev_s *fb,
FAR struct fb_priv_s *priv,
int overlay);
static void fb_sem_post(FAR struct fb_chardev_s *fb, int overlay);
#endif
#ifdef CONFIG_BUILD_KERNEL
static int fb_munmap(FAR struct task_group_s *group,
FAR struct mm_map_entry_s *entry,
FAR void *start, size_t length);
#endif
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations g_fb_fops =
{
fb_open, /* open */
fb_close, /* close */
fb_read, /* read */
fb_write, /* write */
fb_seek, /* seek */
fb_ioctl, /* ioctl */
fb_mmap, /* mmap */
NULL, /* truncate */
fb_poll /* poll */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: fb_get_panbuf
****************************************************************************/
static FAR struct circbuf_s *fb_get_panbuf(FAR struct fb_chardev_s *fb,
int overlay)
{
int id = overlay + 1;
DEBUGASSERT(id >= 0 && id < fb->paninfo_count);
return &(fb->paninfo[id].buf);
}
/****************************************************************************
* Name: fb_add_paninfo
****************************************************************************/
static int fb_add_paninfo(FAR struct fb_chardev_s *fb,
FAR const union fb_paninfo_u *info,
int overlay)
{
FAR struct circbuf_s *panbuf;
irqstate_t flags;
ssize_t ret;
DEBUGASSERT(fb != NULL);
panbuf = fb_get_panbuf(fb, overlay);
if (panbuf == NULL)
{
return -EINVAL;
}
/* Disable the interrupt when writing to the queue to
* prevent it from being modified by the interrupted
* thread during the writing process.
*/
flags = enter_critical_section();
/* Write planeinfo information to the queue. */
ret = circbuf_write(panbuf, info, sizeof(union fb_paninfo_u));
if (ret != sizeof(union fb_paninfo_u))
{
gwarn("WARNING: circbuf_write(panbuf) failed\n");
}
/* Re-enable interrupts */
leave_critical_section(flags);
return ret <= 0 ? -ENOSPC : OK;
}
/****************************************************************************
* Name: fb_open
****************************************************************************/
static int fb_open(FAR struct file *filep)
{
FAR struct inode *inode;
FAR struct fb_chardev_s *fb;
FAR struct fb_priv_s *priv;
irqstate_t flags;
int ret;
inode = filep->f_inode;
fb = inode->i_private;
DEBUGASSERT(fb->vtable != NULL);
priv = kmm_zalloc(sizeof(*priv));
if (priv == NULL)
{
return -ENOMEM;
}
flags = enter_critical_section();
if (fb->head == NULL)
{
if (fb->vtable->open != NULL &&
(ret = fb->vtable->open(fb->vtable)) < 0)
{
goto err_fb;
}
}
priv->overlay = FB_NO_OVERLAY;
#ifdef CONFIG_FB_SYNC
nxsem_init(&priv->wait, 0, 0);
#endif
/* Attach the open structure to the device */
priv->flink = fb->head;
fb->head = priv;
filep->f_priv = priv;
leave_critical_section(flags);
return 0;
err_fb:
leave_critical_section(flags);
kmm_free(priv);
return ret;
}
/****************************************************************************
* Name: fb_close
****************************************************************************/
static int fb_close(FAR struct file *filep)
{
FAR struct inode *inode;
FAR struct fb_chardev_s *fb;
FAR struct fb_priv_s *priv;
FAR struct fb_priv_s *curr;
FAR struct fb_priv_s *prev;
irqstate_t flags;
int ret;
inode = filep->f_inode;
fb = inode->i_private;
priv = filep->f_priv;
DEBUGASSERT(fb->vtable != NULL && priv != NULL);
flags = enter_critical_section();
DEBUGASSERT(fb->head);
if (fb->head->flink == NULL)
{
if (fb->vtable->close != NULL)
{
ret = fb->vtable->close(fb->vtable);
if (ret < 0)
{
leave_critical_section(flags);
return ret;
}
}
}
/* Find the open structure in the list of
* open structures for the device.
*/
for (prev = NULL, curr = fb->head;
curr && curr != priv;
prev = curr, curr = curr->flink);
DEBUGASSERT(curr);
/* Remove the structure from the device */
if (prev)
{
prev->flink = priv->flink;
}
else
{
fb->head = priv->flink;
}
leave_critical_section(flags);
#ifdef CONFIG_FB_SYNC
nxsem_destroy(&priv->wait);
#endif
kmm_free(priv);
return OK;
}
/****************************************************************************
* Name: fb_read
****************************************************************************/
static ssize_t fb_read(FAR struct file *filep, FAR char *buffer, size_t len)
{
FAR struct inode *inode;
FAR struct fb_chardev_s *fb;
FAR struct fb_priv_s *priv;
struct fb_panelinfo_s panelinfo;
size_t start;
size_t end;
size_t size;
int ret;
ginfo("len: %u\n", (unsigned int)len);
/* Get the framebuffer instance */
inode = filep->f_inode;
fb = inode->i_private;
priv = filep->f_priv;
DEBUGASSERT(fb->vtable != NULL && priv != NULL);
/* Get panel info */
ret = fb_get_panelinfo(fb, &panelinfo, priv->overlay);
if (ret < 0)
{
return ret;
}
/* Get the start and size of the transfer */
start = filep->f_pos;
if (start >= panelinfo.fblen)
{
return 0; /* Return end-of-file */
}
end = start + len;
if (end >= panelinfo.fblen)
{
end = panelinfo.fblen;
}
size = end - start;
/* And transfer the data from the frame buffer */
memcpy(buffer, panelinfo.fbmem + start, size);
filep->f_pos += size;
return size;
}
/****************************************************************************
* Name: fb_write
****************************************************************************/
static ssize_t fb_write(FAR struct file *filep, FAR const char *buffer,
size_t len)
{
FAR struct inode *inode;
FAR struct fb_chardev_s *fb;
FAR struct fb_priv_s *priv;
struct fb_panelinfo_s panelinfo;
size_t start;
size_t end;
size_t size;
int ret;
ginfo("len: %u\n", (unsigned int)len);
/* Get the framebuffer instance */
inode = filep->f_inode;
fb = inode->i_private;
priv = filep->f_priv;
DEBUGASSERT(fb->vtable != NULL && priv != NULL);
/* Get panel info */
ret = fb_get_panelinfo(fb, &panelinfo, priv->overlay);
if (ret < 0)
{
return ret;
}
/* Get the start and size of the transfer */
start = filep->f_pos;
if (start >= panelinfo.fblen)
{
return -EFBIG; /* Cannot extend the framebuffer */
}
end = start + len;
if (end >= panelinfo.fblen)
{
end = panelinfo.fblen;
}
size = end - start;
/* And transfer the data into the frame buffer */
memcpy(panelinfo.fbmem + start, buffer, size);
filep->f_pos += size;
return size;
}
/****************************************************************************
* Name: fb_seek
*
* Description:
* Seek the logical file pointer to the specified position. The offset
* is in units of pixels, with offset zero being the beginning of the
* framebuffer.
*
****************************************************************************/
static off_t fb_seek(FAR struct file *filep, off_t offset, int whence)
{
FAR struct inode *inode;
FAR struct fb_chardev_s *fb;
FAR struct fb_priv_s *priv;
struct fb_panelinfo_s panelinfo;
off_t newpos;
int ret;
ginfo("offset: %u whence: %d\n", (unsigned int)offset, whence);
/* Get the framebuffer instance */
inode = filep->f_inode;
fb = inode->i_private;
priv = filep->f_priv;
DEBUGASSERT(fb->vtable != NULL && priv != NULL);
/* Determine the new, requested file position */
switch (whence)
{
case SEEK_CUR:
newpos = filep->f_pos + offset;
break;
case SEEK_SET:
newpos = offset;
break;
case SEEK_END:
/* Get panel info */
ret = fb_get_panelinfo(fb, &panelinfo, priv->overlay);
if (ret < 0)
{
return ret;
}
newpos = panelinfo.fblen + offset;
break;
default:
/* Return EINVAL if the whence argument is invalid */
return -EINVAL;
}
/* Opengroup.org:
*
* "The lseek() function shall allow the file offset to be set beyond the
* end of the existing data in the file. If data is later written at this
* point, subsequent reads of data in the gap shall return bytes with the
* value 0 until data is actually written into the gap."
*
* We can conform to the first part, but not the second. Return EINVAL if
* "...the resulting file offset would be negative for a regular file,
* block special file, or directory."
*/
if (newpos >= 0)
{
filep->f_pos = newpos;
ret = newpos;
}
else
{
ret = -EINVAL;
}
return ret;
}
/****************************************************************************
* Name: fb_ioctl
*
* Description:
* The standard ioctl method.
*
****************************************************************************/
static int fb_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
FAR struct inode *inode;
FAR struct fb_chardev_s *fb;
int ret = OK;
ginfo("cmd: %d arg: %ld\n", cmd, arg);
/* Get the framebuffer instance */
inode = filep->f_inode;
fb = inode->i_private;
/* Process the IOCTL command */
switch (cmd)
{
case FBIOGET_VIDEOINFO: /* Get color plane info */
{
FAR struct fb_videoinfo_s *vinfo =
(FAR struct fb_videoinfo_s *)((uintptr_t)arg);
DEBUGASSERT(vinfo != 0 && fb->vtable != NULL &&
fb->vtable->getvideoinfo != NULL);
ret = fb->vtable->getvideoinfo(fb->vtable, vinfo);
}
break;
case FBIOGET_PLANEINFO: /* Get video plane info */
{
FAR struct fb_planeinfo_s *pinfo =
(FAR struct fb_planeinfo_s *)((uintptr_t)arg);
DEBUGASSERT(pinfo != 0);
ret = fb_get_planeinfo(fb, pinfo, pinfo->display);
}
break;
#ifdef CONFIG_FB_CMAP
case FBIOGET_CMAP: /* Get RGB color mapping */
{
FAR struct fb_cmap_s *cmap =
(FAR struct fb_cmap_s *)((uintptr_t)arg);
DEBUGASSERT(cmap != 0 && fb->vtable != NULL &&
fb->vtable->getcmap != NULL);
ret = fb->vtable->getcmap(fb->vtable, cmap);
}
break;
case FBIOPUT_CMAP: /* Put RGB color mapping */
{
FAR const struct fb_cmap_s *cmap =
(FAR struct fb_cmap_s *)((uintptr_t)arg);
DEBUGASSERT(cmap != 0 && fb->vtable != NULL &&
fb->vtable->putcmap != NULL);
ret = fb->vtable->putcmap(fb->vtable, cmap);
}
break;
#endif
#ifdef CONFIG_FB_HWCURSOR
case FBIOGET_CURSOR: /* Get cursor attributes */
{
FAR struct fb_cursorattrib_s *attrib =
(FAR struct fb_cursorattrib_s *)((uintptr_t)arg);
DEBUGASSERT(attrib != 0 && fb->vtable != NULL &&
fb->vtable->getcursor != NULL);
ret = fb->vtable->getcursor(fb->vtable, attrib);
}
break;
case FBIOPUT_CURSOR: /* Set cursor attributes */
{
FAR struct fb_setcursor_s *cursor =
(FAR struct fb_setcursor_s *)((uintptr_t)arg);
DEBUGASSERT(cursor != 0 && fb->vtable != NULL &&
fb->vtable->setcursor != NULL);
ret = fb->vtable->setcursor(fb->vtable, cursor);
}
break;
#endif
#ifdef CONFIG_FB_UPDATE
case FBIO_UPDATE: /* Update the modified framebuffer data */
{
struct fb_area_s *area = (FAR struct fb_area_s *)((uintptr_t)arg);
DEBUGASSERT(fb->vtable != NULL && fb->vtable->updatearea != NULL);
ret = fb->vtable->updatearea(fb->vtable, area);
}
break;
#endif
#ifdef CONFIG_FB_SYNC
case FBIO_WAITFORVSYNC: /* Wait upon vertical sync */
{
FAR struct fb_priv_s *priv = (FAR struct fb_priv_s *)filep->f_priv;
DEBUGASSERT(fb->vtable != NULL);
if (fb->vtable->waitforvsync != NULL)
{
ret = fb->vtable->waitforvsync(fb->vtable);
break;
}
ret = fb_sem_wait(fb, priv, priv->overlay);
}
break;
#endif
#ifdef CONFIG_FB_OVERLAY
case FBIO_SELECT_OVERLAY: /* Select video overlay */
{
struct fb_overlayinfo_s oinfo;
FAR struct fb_priv_s *priv = filep->f_priv;
DEBUGASSERT(priv != NULL && fb->vtable != NULL &&
fb->vtable->getoverlayinfo != NULL);
if (arg != FB_NO_OVERLAY)
{
memset(&oinfo, 0, sizeof(oinfo));
ret = fb->vtable->getoverlayinfo(fb->vtable, arg, &oinfo);
}
if (ret >= 0)
{
priv->overlay = arg;
}
}
break;
case FBIOGET_OVERLAYINFO: /* Get video overlay info */
{
FAR struct fb_overlayinfo_s *oinfo =
(FAR struct fb_overlayinfo_s *)((uintptr_t)arg);
DEBUGASSERT(oinfo != 0 && fb->vtable != NULL &&
fb->vtable->getoverlayinfo != NULL);
ret = fb->vtable->getoverlayinfo(fb->vtable,
oinfo->overlay, oinfo);
}
break;
case FBIOSET_TRANSP: /* Set video overlay transparency */
{
FAR struct fb_overlayinfo_s *oinfo =
(FAR struct fb_overlayinfo_s *)((uintptr_t)arg);
DEBUGASSERT(oinfo != 0 && fb->vtable != NULL &&
fb->vtable->settransp != NULL);
ret = fb->vtable->settransp(fb->vtable, oinfo);
}
break;
case FBIOSET_CHROMAKEY: /* Set video overlay chroma key */
{
FAR struct fb_overlayinfo_s *oinfo =
(FAR struct fb_overlayinfo_s *)((uintptr_t)arg);
DEBUGASSERT(oinfo != 0 && fb->vtable != NULL &&
fb->vtable->setchromakey != NULL);
ret = fb->vtable->setchromakey(fb->vtable, oinfo);
}
break;
case FBIOSET_COLOR: /* Set video overlay color */
{
FAR struct fb_overlayinfo_s *oinfo =
(FAR struct fb_overlayinfo_s *)((uintptr_t)arg);
DEBUGASSERT(oinfo != 0 && fb->vtable != NULL &&
fb->vtable->setcolor != NULL);
ret = fb->vtable->setcolor(fb->vtable, oinfo);
}
break;
case FBIOSET_BLANK: /* Blank or unblank video overlay */
{
FAR struct fb_overlayinfo_s *oinfo =
(FAR struct fb_overlayinfo_s *)((uintptr_t)arg);
DEBUGASSERT(oinfo != 0 && fb->vtable != NULL &&
fb->vtable->setblank != NULL);
ret = fb->vtable->setblank(fb->vtable, oinfo);
}
break;
case FBIOSET_AREA: /* Set active video overlay area */
{
FAR struct fb_overlayinfo_s *oinfo =
(FAR struct fb_overlayinfo_s *)((uintptr_t)arg);
DEBUGASSERT(oinfo != 0 && fb->vtable != NULL &&
fb->vtable->setarea != NULL);
ret = fb->vtable->setarea(fb->vtable, oinfo);
}
break;
case FBIOSET_DESTAREA: /* Set destination area on the primary FB */
{
FAR struct fb_overlayinfo_s *oinfo =
(FAR struct fb_overlayinfo_s *)((uintptr_t)arg);
DEBUGASSERT(oinfo != 0 && fb->vtable != NULL &&
fb->vtable->setdestarea != NULL);
ret = fb->vtable->setdestarea(fb->vtable, oinfo);
}
break;
#ifdef CONFIG_FB_OVERLAY_BLIT
case FBIOSET_BLIT: /* Blit operation between video overlays */
{
FAR struct fb_overlayblit_s *blit =
(FAR struct fb_overlayblit_s *)((uintptr_t)arg);
DEBUGASSERT(blit != 0 && fb->vtable != NULL &&
fb->vtable->blit != NULL);
ret = fb->vtable->blit(fb->vtable, blit);
}
break;
case FBIOSET_BLEND: /* Blend operation between video overlays */
{
FAR struct fb_overlayblend_s *blend =
(FAR struct fb_overlayblend_s *)((uintptr_t)arg);
DEBUGASSERT(blend != 0 && fb->vtable != NULL &&
fb->vtable->blend != NULL);
ret = fb->vtable->blend(fb->vtable, blend);
}
break;
#endif
case FBIOPAN_OVERLAY:
{
FAR struct fb_overlayinfo_s *oinfo =
(FAR struct fb_overlayinfo_s *)((uintptr_t)arg);
union fb_paninfo_u paninfo;
DEBUGASSERT(oinfo != 0 && fb->vtable != NULL);
memcpy(&paninfo, oinfo, sizeof(*oinfo));
if (fb->vtable->panoverlay != NULL)
{
fb->vtable->panoverlay(fb->vtable, oinfo);
}
ret = fb_add_paninfo(fb, &paninfo, oinfo->overlay);
}
break;
#endif /* CONFIG_FB_OVERLAY */
case FBIOSET_POWER:
{
DEBUGASSERT(fb->vtable != NULL &&
fb->vtable->setpower != NULL);
ret = fb->vtable->setpower(fb->vtable, (int)arg);
}
break;
case FBIOGET_POWER:
{
FAR int *power = (FAR int *)((uintptr_t)arg);
DEBUGASSERT(power != NULL && fb->vtable != NULL &&
fb->vtable->getpower != NULL);
*(power) = fb->vtable->getpower(fb->vtable);
}
break;
case FBIOGET_FRAMERATE:
{
FAR int *rate = (FAR int *)((uintptr_t)arg);
DEBUGASSERT(rate != NULL && fb->vtable != NULL &&
fb->vtable->getframerate != NULL);
*(rate) = fb->vtable->getframerate(fb->vtable);
}
break;
case FBIOSET_FRAMERATE:
{
DEBUGASSERT(fb->vtable != NULL &&
fb->vtable->setframerate != NULL);
ret = fb->vtable->setframerate(fb->vtable, (int)arg);
}
break;
case FBIOPAN_DISPLAY:
{
FAR struct fb_planeinfo_s *pinfo =
(FAR struct fb_planeinfo_s *)((uintptr_t)arg);
union fb_paninfo_u paninfo;
DEBUGASSERT(pinfo != NULL && fb->vtable != NULL);
memcpy(&paninfo, pinfo, sizeof(*pinfo));
if (fb->vtable->pandisplay != NULL)
{
fb->vtable->pandisplay(fb->vtable, pinfo);
}
ret = fb_add_paninfo(fb, &paninfo, FB_NO_OVERLAY);
}
break;
case FBIOSET_VSYNCOFFSET:
{
fb->vsyncoffset = USEC2TICK(arg);
}
break;
case FBIOGET_VSCREENINFO:
{
struct fb_videoinfo_s vinfo;
struct fb_planeinfo_s pinfo;
FAR struct fb_var_screeninfo *varinfo =
(FAR struct fb_var_screeninfo *)((uintptr_t)arg);
DEBUGASSERT(varinfo != 0 && fb->vtable != NULL &&
fb->vtable->getvideoinfo != NULL);
ret = fb->vtable->getvideoinfo(fb->vtable, &vinfo);
if (ret < 0)
{
break;
}
ret = fb_get_planeinfo(fb, &pinfo, 0);
if (ret < 0)
{
break;
}
memset(varinfo, 0, sizeof(struct fb_var_screeninfo));
varinfo->xres = vinfo.xres;
varinfo->yres = vinfo.yres;
varinfo->xres_virtual = pinfo.xres_virtual;
varinfo->yres_virtual = pinfo.yres_virtual;
varinfo->xoffset = pinfo.xoffset;
varinfo->yoffset = pinfo.yoffset;
varinfo->bits_per_pixel = pinfo.bpp;
varinfo->grayscale = FB_ISMONO(vinfo.fmt);
switch (vinfo.fmt)
{
case FB_FMT_Y1:
varinfo->red.offset = 0;
varinfo->green.offset = 0;
varinfo->blue.offset = 0;
varinfo->red.length = 1;
varinfo->green.length = 1;
varinfo->blue.length = 1;
break;
case FB_FMT_Y8:
varinfo->red.offset = 0;
varinfo->green.offset = 0;
varinfo->blue.offset = 0;
varinfo->red.length = 8;
varinfo->green.length = 8;
varinfo->blue.length = 8;
break;
case FB_FMT_RGB16_555:
varinfo->red.offset = 10;
varinfo->green.offset = 5;
varinfo->blue.offset = 0;
varinfo->red.length = 5;
varinfo->green.length = 5;
varinfo->blue.length = 5;
break;
case FB_FMT_RGB16_565:
varinfo->red.offset = 11;
varinfo->green.offset = 5;
varinfo->blue.offset = 0;
varinfo->red.length = 5;
varinfo->green.length = 6;
varinfo->blue.length = 5;
break;
case FB_FMT_RGB24:
case FB_FMT_RGB32:
varinfo->red.offset = 16;
varinfo->green.offset = 8;
varinfo->blue.offset = 0;
varinfo->red.length = 8;
varinfo->green.length = 8;
varinfo->blue.length = 8;
break;
case FB_FMT_RGBA32:
varinfo->red.offset = 16;
varinfo->green.offset = 8;
varinfo->blue.offset = 0;
varinfo->transp.offset = 24;
varinfo->red.length = 8;
varinfo->green.length = 8;
varinfo->blue.length = 8;
varinfo->transp.length = 8;
break;
}
}
break;
case FBIOGET_FSCREENINFO:
{
struct fb_videoinfo_s vinfo;
struct fb_planeinfo_s pinfo;
FAR struct fb_fix_screeninfo *fixinfo =
(FAR struct fb_fix_screeninfo *)((uintptr_t)arg);
DEBUGASSERT(fixinfo != 0 && fb->vtable != NULL &&
fb->vtable->getvideoinfo != NULL);
ret = fb->vtable->getvideoinfo(fb->vtable, &vinfo);
if (ret < 0)
{
break;
}
ret = fb_get_planeinfo(fb, &pinfo, 0);
if (ret < 0)
{
break;
}
memset(fixinfo, 0, sizeof(struct fb_fix_screeninfo));
#ifdef CONFIG_FB_MODULEINFO
strlcpy(fixinfo->id, (FAR const char *)vinfo.moduleinfo,
sizeof(fixinfo->id));
#endif
fixinfo->smem_start = (unsigned long)pinfo.fbmem;
fixinfo->smem_len = pinfo.fblen;
fixinfo->type = FB_ISYUVPLANAR(vinfo.fmt) ?
FB_TYPE_INTERLEAVED_PLANES :
FB_TYPE_PACKED_PIXELS;
fixinfo->visual = FB_ISMONO(vinfo.fmt) ?
FB_VISUAL_MONO10 : FB_VISUAL_TRUECOLOR;
fixinfo->line_length = pinfo.stride;
}
break;
default:
if (fb->vtable->ioctl != NULL)
{
ret = fb->vtable->ioctl(fb->vtable, cmd, arg);
}
else
{
gerr("ERROR: Unsupported IOCTL command: %d\n", cmd);
ret = -ENOTTY;
}
break;
}
return ret;
}
#ifdef CONFIG_BUILD_KERNEL
static int fb_munmap(FAR struct task_group_s *group,
FAR struct mm_map_entry_s *entry,
FAR void *start, size_t length)
{
if (group && entry)
{
ginfo("%p, len=%zu\n", entry->vaddr, entry->length);
vm_unmap_region(entry->vaddr, entry->length);
mm_map_remove(get_current_mm(), entry);
}
return OK;
}
#endif
static int fb_mmap(FAR struct file *filep, FAR struct mm_map_entry_s *map)
{
FAR struct inode *inode;
FAR struct fb_chardev_s *fb;
FAR struct fb_priv_s *priv;
struct fb_panelinfo_s panelinfo;
int ret;
/* Get the framebuffer instance */
inode = filep->f_inode;
fb = inode->i_private;
priv = filep->f_priv;
DEBUGASSERT(fb->vtable != NULL && priv != NULL);
/* Get panel info */
ret = fb_get_panelinfo(fb, &panelinfo, priv->overlay);
if (ret < 0)
{
return ret;
}
/* Return the address corresponding to the start of frame buffer. */
if (map->offset >= 0 && map->offset < panelinfo.fblen &&
map->length && map->offset + map->length <= panelinfo.fblen)
{
#ifdef CONFIG_BUILD_KERNEL
map->vaddr = vm_map_region((uintptr_t)panelinfo.fbmem + map->offset,
panelinfo.fblen);
map->length = panelinfo.fblen;
map->munmap = fb_munmap;
mm_map_add(get_current_mm(), map);
#else
map->vaddr = (FAR char *)panelinfo.fbmem + map->offset;
#endif
return OK;
}
return -EINVAL;
}
/****************************************************************************
* Name: fb_poll
*
* Description:
* Wait for framebuffer to be writable.
*
****************************************************************************/
static int fb_poll(FAR struct file *filep, struct pollfd *fds, bool setup)
{
FAR struct inode *inode;
FAR struct fb_chardev_s *fb;
FAR struct fb_priv_s *priv;
FAR struct circbuf_s *panbuf;
FAR struct pollfd **pollfds = NULL;
irqstate_t flags;
int ret = OK;
int i;
/* Get the framebuffer instance */
inode = filep->f_inode;
fb = inode->i_private;
priv = filep->f_priv;
DEBUGASSERT(fb->vtable != NULL && priv != NULL);
flags = enter_critical_section();
if (setup)
{
for (i = 0; i < CONFIG_VIDEO_FB_NPOLLWAITERS; ++i)
{
if (!priv->fds[i])
{
pollfds = &priv->fds[i];
break;
}
}
if (pollfds == NULL)
{
ret = -EBUSY;
goto errout;
}
*pollfds = fds;
fds->priv = pollfds;
panbuf = fb_get_panbuf(fb, priv->overlay);
if (!circbuf_is_full(panbuf))
{
poll_notify(&fds, 1, POLLOUT);
}
}
else if (fds->priv != NULL)
{
/* This is a request to tear down the poll. */
FAR struct pollfd **slot = (FAR struct pollfd **)fds->priv;
*slot = NULL;
fds->priv = NULL;
}
errout:
leave_critical_section(flags);
return ret;
}
/****************************************************************************
* Name: fb_get_panelinfo
****************************************************************************/
static int fb_get_panelinfo(FAR struct fb_chardev_s *fb,
FAR struct fb_panelinfo_s *panelinfo,
int overlay)
{
struct fb_planeinfo_s pinfo;
struct fb_videoinfo_s vinfo;
int ret;
#ifdef CONFIG_FB_OVERLAY
if (overlay != FB_NO_OVERLAY)
{
struct fb_overlayinfo_s oinfo;
DEBUGASSERT(fb->vtable->getoverlayinfo != NULL);
memset(&oinfo, 0, sizeof(oinfo));
ret = fb->vtable->getoverlayinfo(fb->vtable, overlay, &oinfo);
if (ret < 0)
{
gerr("ERROR: getoverlayinfo() failed: %d\n", ret);
return ret;
}
panelinfo->fbmem = oinfo.fbmem;
panelinfo->fblen = oinfo.fblen;
panelinfo->fbcount = oinfo.yres_virtual == 0 ?
1 : (oinfo.yres_virtual / oinfo.yres);
panelinfo->bpp = oinfo.bpp;
return OK;
}
#endif
ret = fb_get_planeinfo(fb, &pinfo, 0);
if (ret < 0)
{
return ret;
}
ret = fb->vtable->getvideoinfo(fb->vtable, &vinfo);
if (ret < 0)
{
gerr("ERROR: getvideoinfo() failed: %d\n", ret);
return ret;
}
panelinfo->fbmem = pinfo.fbmem;
panelinfo->fblen = pinfo.fblen;
panelinfo->fbcount = pinfo.yres_virtual == 0 ?
1 : (pinfo.yres_virtual / vinfo.yres);
panelinfo->bpp = pinfo.bpp;
return OK;
}
/****************************************************************************
* Name: fb_get_planeinfo
****************************************************************************/
static int fb_get_planeinfo(FAR struct fb_chardev_s *fb,
FAR struct fb_planeinfo_s *pinfo,
uint8_t display)
{
int ret;
DEBUGASSERT(fb->vtable != NULL);
DEBUGASSERT(fb->vtable->getplaneinfo != NULL);
memset(pinfo, 0, sizeof(struct fb_planeinfo_s));
pinfo->display = display;
ret = fb->vtable->getplaneinfo(fb->vtable, fb->plane, pinfo);
if (ret < 0)
{
gerr("ERROR: getplaneinfo() failed: %d\n", ret);
return ret;
}
return OK;
}
/****************************************************************************
* Name: fb_do_pollnotify
****************************************************************************/
static void fb_do_pollnotify(wdparm_t arg)
{
FAR struct fb_paninfo_s *paninfo = (FAR struct fb_paninfo_s *)arg;
FAR struct fb_priv_s * priv;
irqstate_t flags;
int overlay;
overlay = paninfo - paninfo->dev->paninfo - 1;
flags = enter_critical_section();
for (priv = paninfo->dev->head; priv; priv = priv->flink)
{
if (priv->overlay != overlay)
{
continue;
}
/* Notify framebuffer is writable. */
poll_notify(priv->fds, CONFIG_VIDEO_FB_NPOLLWAITERS, POLLOUT);
}
leave_critical_section(flags);
}
#ifdef CONFIG_FB_SYNC
/****************************************************************************
* Name: fb_sem_wait
****************************************************************************/
static int fb_sem_wait(FAR struct fb_chardev_s *fb,
FAR struct fb_priv_s *priv,
int overlay)
{
struct fb_panelinfo_s panelinfo;
irqstate_t flags;
int ret;
ret = fb_get_panelinfo(fb, &panelinfo, overlay);
if (ret < 0)
{
return ret;
}
flags = enter_critical_section();
if (fb_paninfo_count(fb->vtable, overlay) == panelinfo.fbcount)
{
ret = nxsem_wait(&priv->wait);
}
leave_critical_section(flags);
return ret;
}
/****************************************************************************
* Name: fb_sem_post
****************************************************************************/
static void fb_sem_post(FAR struct fb_chardev_s *fb, int overlay)
{
FAR struct fb_priv_s * priv;
irqstate_t flags;
DEBUGASSERT(fb != NULL);
flags = enter_critical_section();
for (priv = fb->head; priv; priv = priv->flink)
{
if (priv->overlay != overlay)
{
continue;
}
for (; ; )
{
int semcount = 0;
sem_getvalue(&priv->wait, &semcount);
if (semcount >= 0)
{
break;
}
/* Wakeup all waiters. */
nxsem_post(&priv->wait);
}
}
leave_critical_section(flags);
}
#endif
/****************************************************************************
* Name: fb_pollnotify
*
* Description:
* Notify the waiting thread that the framebuffer can be written.
*
* Input Parameters:
* vtable - Pointer to framebuffer's virtual table.
*
****************************************************************************/
static void fb_pollnotify(FAR struct fb_chardev_s *fb, int overlay)
{
int id = overlay + 1;
DEBUGASSERT(fb != NULL);
DEBUGASSERT(id >= 0 && id < fb->paninfo_count);
if (fb->vsyncoffset > 0)
{
wd_start(&fb->paninfo[id].wdog, fb->vsyncoffset, fb_do_pollnotify,
(wdparm_t)(&fb->paninfo[id]));
}
else
{
fb_do_pollnotify((wdparm_t)(&fb->paninfo[id]));
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: fb_notify_vsync
* Description:
* notify that the vsync comes.
*
* Input Parameters:
* vtable - Pointer to framebuffer's virtual table.
*
****************************************************************************/
void fb_notify_vsync(FAR struct fb_vtable_s *vtable)
{
FAR struct fb_chardev_s *fb;
FAR struct fb_priv_s * priv;
irqstate_t flags;
fb = vtable->priv;
if (fb != NULL)
{
flags = enter_critical_section();
for (priv = fb->head; priv; priv = priv->flink)
{
/* Notify that the vsync comes. */
poll_notify(priv->fds, CONFIG_VIDEO_FB_NPOLLWAITERS, POLLPRI);
}
leave_critical_section(flags);
}
}
/****************************************************************************
* Name: fb_peek_paninfo
* Description:
* Peek a frame from pan info queue of the specified overlay.
*
* Input Parameters:
* vtable - Pointer to framebuffer's virtual table.
* info - Pointer to pan info.
* overlay - Overlay index.
*
* Returned Value:
* Zero is returned on success; a negated errno value is returned on any
* failure.
****************************************************************************/
int fb_peek_paninfo(FAR struct fb_vtable_s *vtable,
FAR union fb_paninfo_u *info,
int overlay)
{
FAR struct circbuf_s *panbuf;
FAR struct fb_chardev_s *fb;
irqstate_t flags;
ssize_t ret;
/* Prevent calling before getting the vtable. */
fb = vtable->priv;
if (fb == NULL)
{
return -EINVAL;
}
panbuf = fb_get_panbuf(fb, overlay);
if (panbuf == NULL)
{
return -EINVAL;
}
flags = enter_critical_section();
/* Attempt to peek a frame from the vsync queue. */
ret = circbuf_peek(panbuf, info, sizeof(union fb_paninfo_u));
DEBUGASSERT(ret <= 0 || ret == sizeof(union fb_paninfo_u));
/* Re-enable interrupts */
leave_critical_section(flags);
return ret <= 0 ? -ENOSPC : OK;
}
/****************************************************************************
* Name: fb_remove_paninfo
* Description:
* Remove a frame from pan info queue of the specified overlay.
*
* Input Parameters:
* vtable - Pointer to framebuffer's virtual table.
* overlay - Overlay index.
*
* Returned Value:
* Zero is returned on success; a negated errno value is returned on any
* failure.
****************************************************************************/
int fb_remove_paninfo(FAR struct fb_vtable_s *vtable, int overlay)
{
FAR struct circbuf_s *panbuf;
FAR struct fb_chardev_s *fb;
irqstate_t flags;
ssize_t ret;
bool full;
fb = vtable->priv;
if (fb == NULL)
{
return -EINVAL;
}
panbuf = fb_get_panbuf(fb, overlay);
if (panbuf == NULL)
{
return -EINVAL;
}
flags = enter_critical_section();
full = (circbuf_space(panbuf) == 0);
/* Attempt to take a frame from the pan info. */
ret = circbuf_skip(panbuf, sizeof(union fb_paninfo_u));
DEBUGASSERT(ret <= 0 || ret == sizeof(union fb_paninfo_u));
/* Re-enable interrupts */
leave_critical_section(flags);
if (ret == sizeof(union fb_paninfo_u))
{
fb_pollnotify(fb, overlay);
if (full)
{
#ifdef CONFIG_FB_SYNC
fb_sem_post(fb, overlay);
#endif
}
}
return ret <= 0 ? -ENOSPC : OK;
}
/****************************************************************************
* Name: fb_paninfo_count
* Description:
* Get pan info count of specified overlay pan info queue.
*
* Input Parameters:
* vtable - Pointer to framebuffer's virtual table.
* overlay - Overlay index.
*
* Returned Value:
* a non-negative value is returned on success; a negated errno value is
* returned on any failure.
****************************************************************************/
int fb_paninfo_count(FAR struct fb_vtable_s *vtable, int overlay)
{
FAR struct circbuf_s *panbuf;
FAR struct fb_chardev_s *fb;
irqstate_t flags;
ssize_t ret;
/* Prevent calling before getting the vtable. */
fb = vtable->priv;
if (fb == NULL)
{
return -EINVAL;
}
panbuf = fb_get_panbuf(fb, overlay);
if (panbuf == NULL)
{
return -EINVAL;
}
flags = enter_critical_section();
ret = circbuf_used(panbuf) / sizeof(union fb_paninfo_u);
leave_critical_section(flags);
return ret;
}
/****************************************************************************
* Name: fb_register_device
*
* Description:
* Register the framebuffer character device at /dev/fbN where N is the
* display number if the devices supports only a single plane. If the
* hardware supports multiple color planes, then the device will be
* registered at /dev/fbN.M where N is the again display number but M
* is the display plane.
*
* Input Parameters:
* display - The display number for the case of boards supporting multiple
* displays or for hardware that supports multiple
* layers (each layer is consider a display). Typically zero.
* plane - Identifies the color plane on hardware that supports separate
* framebuffer "planes" for each color component.
* vtable - Pointer to framebuffer's virtual table.
*
* Returned Value:
* Zero (OK) is returned success; a negated errno value is returned on any
* failure.
*
****************************************************************************/
int fb_register_device(int display, int plane,
FAR struct fb_vtable_s *vtable)
{
FAR struct fb_chardev_s *fb;
struct fb_panelinfo_s panelinfo;
struct fb_videoinfo_s vinfo;
char devname[16];
int nplanes;
int ret;
size_t i;
/* Allocate a framebuffer state instance */
fb = kmm_zalloc(sizeof(struct fb_chardev_s));
if (fb == NULL)
{
return -ENOMEM;
}
DEBUGASSERT((unsigned)plane <= UINT8_MAX);
DEBUGASSERT(vtable != NULL);
fb->plane = plane;
fb->vtable = vtable;
/* Initialize the frame buffer instance. */
DEBUGASSERT(vtable->getvideoinfo != NULL);
ret = vtable->getvideoinfo(vtable, &vinfo);
if (ret < 0)
{
gerr("ERROR: getvideoinfo() failed: %d\n", ret);
goto errout_with_fb;
}
nplanes = vinfo.nplanes;
DEBUGASSERT(vinfo.nplanes > 0 && (unsigned)plane < vinfo.nplanes);
#ifdef CONFIG_FB_OVERLAY
fb->paninfo_count = vinfo.noverlays;
#endif
/* Add the primary framebuffer */
fb->paninfo_count += 1;
fb->paninfo = kmm_zalloc(sizeof(struct fb_paninfo_s) * fb->paninfo_count);
if (fb->paninfo == NULL)
{
gerr("ERROR: alloc panbuf failed\n");
goto errout_with_fb;
}
for (i = 0; i < fb->paninfo_count; i++)
{
ret = fb_get_panelinfo(fb, &panelinfo, i - 1);
if (ret < 0)
{
goto errout_with_paninfo;
}
ret = circbuf_init(&(fb->paninfo[i].buf), NULL, panelinfo.fbcount
* sizeof(union fb_paninfo_u));
DEBUGASSERT(ret == 0);
fb->paninfo[i].dev = fb;
/* Clear the framebuffer memory */
memset(panelinfo.fbmem, 0, panelinfo.fblen);
}
/* Register the framebuffer device */
if (nplanes < 2)
{
snprintf(devname, sizeof(devname), "/dev/fb%d", display);
}
else
{
snprintf(devname, sizeof(devname), "/dev/fb%d.%d", display, plane);
}
ret = register_driver(devname, &g_fb_fops, 0666, fb);
if (ret < 0)
{
gerr("ERROR: register_driver() failed: %d\n", ret);
goto errout_with_paninfo;
}
vtable->priv = fb;
return OK;
errout_with_paninfo:
while (i-- > 0)
{
circbuf_uninit(&(fb->paninfo[i].buf));
}
kmm_free(fb->paninfo);
errout_with_fb:
kmm_free(fb);
return ret;
}
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