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nuttx/drivers/video/fb.c

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/****************************************************************************
* graphics/fb/fb.c
* Framebuffer character driver
*
* Copyright (C) 2017 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <nuttx/kmalloc.h>
#include <nuttx/fs/fs.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/nx/nx.h>
#include <nuttx/nx/nxglib.h>
#include <nuttx/video/fb.h>
/****************************************************************************
* Private Types
****************************************************************************/
/* 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 */
FAR void *fbmem; /* Start of frame buffer memory */
size_t fblen; /* Size of the framebuffer */
uint8_t plane; /* Video plan number */
uint8_t bpp; /* Bits per pixel */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
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);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations fb_fops =
{
fb_open, /* open */
fb_close, /* close */
fb_read, /* read */
fb_write, /* write */
fb_seek, /* seek */
fb_ioctl /* ioctl */
#ifndef CONFIG_DISABLE_POLL
, NULL /* poll */
#endif
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
, NULL /* unlink */
#endif
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: fb_open
*
* Description:
* This function is called whenever the framebuffer device is opened.
*
****************************************************************************/
static int fb_open(FAR struct file *filep)
{
DEBUGASSERT(filep != NULL && filep->f_inode != NULL);
return OK;
}
/****************************************************************************
* Name: fb_close
*
* Description:
* This function is called when the framebuffer device is closed.
*
****************************************************************************/
static int fb_close(FAR struct file *filep)
{
DEBUGASSERT(filep != NULL && filep->f_inode != NULL);
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;
size_t start;
size_t end;
size_t size;
ginfo("len: %u\n", (unsigned int)len);
/* Get the framebuffer instance */
DEBUGASSERT(filep != NULL && filep->f_inode != NULL);
inode = filep->f_inode;
fb = (FAR struct fb_chardev_s *)inode->i_private;
/* Get the start and size of the transfer */
start = filep->f_pos;
if (start >= fb->fblen)
{
return 0; /* Return end-of-file */
}
end = start + len;
if (end >= fb->fblen)
{
end = fb->fblen;
}
size = end - start;
/* And transfer the data from the frame buffer */
memcpy(buffer, fb->fbmem, 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;
size_t start;
size_t end;
size_t size;
ginfo("len: %u\n", (unsigned int)len);
/* Get the framebuffer instance */
DEBUGASSERT(filep != NULL && filep->f_inode != NULL);
inode = filep->f_inode;
fb = (FAR struct fb_chardev_s *)inode->i_private;
/* Get the start and size of the transfer */
start = filep->f_pos;
if (start >= fb->fblen)
{
return -EFBIG; /* Cannot extend the framebuffer */
}
end = start + len;
if (end >= fb->fblen)
{
end = fb->fblen;
}
size = end - start;
/* And transfer the data into the frame buffer */
memcpy(fb->fbmem, 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;
off_t newpos;
int ret;
ginfo("offset: %u whence: %d\n", (unsigned int)offset, whence);
/* Get the framebuffer instance */
DEBUGASSERT(filep != NULL && filep->f_inode != NULL);
inode = filep->f_inode;
fb = (FAR struct fb_chardev_s *)inode->i_private;
/* 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:
newpos = fb->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. But 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;
ginfo("cmd: %d arg: %ld\n", cmd, arg);
/* Get the framebuffer instance */
DEBUGASSERT(filep != NULL && filep->f_inode != NULL);
inode = filep->f_inode;
fb = (FAR struct fb_chardev_s *)inode->i_private;
/* Process the IOCTL command */
switch (cmd)
{
case FIOC_MMAP: /* Get color plane info */
{
FAR void **ppv = (FAR void **)((uintptr_t)arg);
/* Return the address corresponding to the start of frame buffer. */
DEBUGASSERT(ppv != NULL);
*ppv = fb->fbmem;
ret = OK;
}
break;
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 && fb->vtable != NULL &&
fb->vtable->getplaneinfo != NULL);
ret = fb->vtable->getplaneinfo(fb->vtable, fb->plane, pinfo);
}
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 attibutes */
{
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_NX_UPDATE
case FBIO_UPDATE: /* Get video plane info */
{
FAR struct nxgl_rect_s *rect =
(FAR struct nxgl_rect_s *)((uintptr_t)arg);
struct fb_planeinfo_s pinfo;
DEBUGASSERT(fb->vtable != NULL && fb->vtable->getplaneinfo != NULL);
ret = fb->vtable->getplaneinfo(fb->vtable, fb->plane, &pinfo);
if (ret >= 0)
{
nx_notify_rectangle((FAR NX_PLANEINFOTYPE *)&pinfo, rect);
}
}
break;
#endif
default:
gerr("ERROR: Unsupported IOCTL command: %d\n", cmd);
ret = -ENOTTY;
break;
}
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: fb_register
*
* 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 multile 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 supports multile
* 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.
*
* Returned Value:
* Zero (OK) is returned success; a negated errno value is returned on any
* failure.
*
****************************************************************************/
int fb_register(int display, int plane)
{
FAR struct fb_chardev_s *fb;
struct fb_videoinfo_s vinfo;
struct fb_planeinfo_s pinfo;
char devname[16];
int nplanes;
int ret;
/* Allocate a framebuffer state instance */
fb = (FAR struct fb_chardev_s *)kmm_zalloc(sizeof(struct fb_chardev_s));
if (fb == NULL)
{
return -ENOMEM;
}
/* Initialize the frame buffer device. */
ret = up_fbinitialize(display);
if (ret < 0)
{
gerr("ERROR: up_fbinitialize() failed for display %d: %d\n", display, ret);
goto errout_with_fb;
}
DEBUGASSERT((unsigned)plane <= UINT8_MAX);
fb->plane = plane;
fb->vtable = up_fbgetvplane(display, plane);
if (fb->vtable == NULL)
{
gerr("ERROR: up_fbgetvplane() failed, vplane=%d\n", plane);
goto errout_with_fb;
}
/* Initialize the frame buffer instance. */
DEBUGASSERT(fb->vtable->getvideoinfo != NULL);
ret = fb->vtable->getvideoinfo(fb->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);
DEBUGASSERT(fb->vtable->getplaneinfo != NULL);
ret = fb->vtable->getplaneinfo(fb->vtable, plane, &pinfo);
if (ret < 0)
{
gerr("ERROR: getplaneinfo() failed: %d\n", ret);
goto errout_with_fb;
}
fb->fbmem = pinfo.fbmem;
fb->fblen = pinfo.fblen;
fb->bpp = pinfo.bpp;
/* Clear the framebuffer memory */
memset(pinfo.fbmem, 0, pinfo.fblen);
/* Register the framebuffer device */
if (nplanes < 2)
{
(void)snprintf(devname, 16, "/dev/fb%d", display);
}
else
{
(void)snprintf(devname, 16, "/dev/fb%d-%d", display, plane);
}
ret = register_driver(devname, &fb_fops, 0666, (FAR void *)fb);
if (ret < 0)
{
gerr("ERROR: register_driver() failed: %d\n", ret);
goto errout_with_fb;
}
return OK;
errout_with_fb:
kmm_free(fb);
return ret;
}
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