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fb_driver: add fb_open and fb_close

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Signed-off-by: jianglianfang <jianglianfang@xiaomi.com>
This commit is contained in:
jianglianfang
2023-05-06 18:05:08 +08:00
committed by Xiang Xiao
parent 37839032cc
commit 14c77dce15
2 changed files with 94 additions and 2 deletions
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drivers/video/fb.c
+89 -2
View File
@@ -69,6 +69,8 @@ struct fb_chardev_s
#ifdef CONFIG_FB_OVERLAY
int overlay; /* Overlay number */
#endif
mutex_t lock; /* Mutual exclusion */
int16_t crefs; /* Number of open references */
};
struct fb_panelinfo_s
@@ -82,6 +84,8 @@ struct fb_panelinfo_s
* 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,
@@ -101,8 +105,8 @@ static int fb_get_panelinfo(FAR struct fb_chardev_s *fb,
static const struct file_operations g_fb_fops =
{
NULL, /* open */
NULL, /* close */
fb_open, /* open */
fb_close, /* close */
fb_read, /* read */
fb_write, /* write */
fb_seek, /* seek */
@@ -116,6 +120,86 @@ static const struct file_operations g_fb_fops =
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: fb_open
****************************************************************************/
static int fb_open(FAR struct file *filep)
{
FAR struct inode *inode;
FAR struct fb_chardev_s *fb;
int ret;
DEBUGASSERT(filep != NULL && filep->f_inode != NULL);
inode = filep->f_inode;
fb = inode->i_private;
DEBUGASSERT(fb->vtable != NULL);
ret = nxmutex_lock(&fb->lock);
if (ret < 0)
{
return ret;
}
if (fb->crefs == 0)
{
if (fb->vtable->open != NULL)
{
ret = fb->vtable->open(fb->vtable);
}
}
if (ret >= 0)
{
fb->crefs++;
DEBUGASSERT(fb->crefs > 0);
}
nxmutex_unlock(&fb->lock);
return ret;
}
/****************************************************************************
* Name: fb_close
****************************************************************************/
static int fb_close(FAR struct file *filep)
{
FAR struct inode *inode;
FAR struct fb_chardev_s *fb;
int ret;
DEBUGASSERT(filep != NULL && filep->f_inode != NULL);
inode = filep->f_inode;
fb = inode->i_private;
DEBUGASSERT(fb->vtable != NULL);
ret = nxmutex_lock(&fb->lock);
if (ret < 0)
{
return ret;
}
if (fb->crefs == 1)
{
if (fb->vtable->close != NULL)
{
ret = fb->vtable->close(fb->vtable);
}
}
if (ret >= 0)
{
DEBUGASSERT(fb->crefs > 0);
fb->crefs--;
}
nxmutex_unlock(&fb->lock);
return ret;
}
/****************************************************************************
* Name: fb_read
****************************************************************************/
@@ -1058,6 +1142,8 @@ int fb_register(int display, int plane)
snprintf(devname, 16, "/dev/fb%d.%d", display, plane);
}
nxmutex_init(&fb->lock);
ret = register_driver(devname, &g_fb_fops, 0666, (FAR void *)fb);
if (ret < 0)
{
@@ -1068,6 +1154,7 @@ int fb_register(int display, int plane)
return OK;
errout_with_fb:
nxmutex_destroy(&fb->lock);
kmm_free(fb);
return ret;
}
include/nuttx/video/fb.h
+5
View File
@@ -673,6 +673,11 @@ struct fb_vtable_s
int (*getplaneinfo)(FAR struct fb_vtable_s *vtable, int planeno,
FAR struct fb_planeinfo_s *pinfo);
/* open/close window. */
int (*open)(FAR struct fb_vtable_s *vtable);
int (*close)(FAR struct fb_vtable_s *vtable);
#ifdef CONFIG_FB_CMAP
/* The following are provided only if the video hardware supports RGB
* color mapping