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nuttx/audio: Add audio_mmap

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1. mmap hw_ptr_s,
2. mmap apb buffers;

Signed-off-by: yangyalei <yangyalei@xiaomi.com>
This commit is contained in:
yangyalei
2025-06-13 16:34:38 +08:00
committed by Alan C. Assis
parent 06e233079f
commit 9c35b01cd8
1 changed files with 65 additions and 0 deletions
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audio/audio.c
+65
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@@ -100,6 +100,8 @@ static ssize_t audio_write(FAR struct file *filep,
static int audio_ioctl(FAR struct file *filep,
int cmd,
unsigned long arg);
static int audio_mmap(FAR struct file *filep,
FAR struct mm_map_entry_s *map);
static int audio_allocbuffer(FAR struct audio_upperhalf_s *upper,
FAR struct audio_buf_desc_s * bufdesc);
static int audio_freebuffer(FAR struct audio_upperhalf_s *upper,
@@ -132,6 +134,7 @@ static const struct file_operations g_audioops =
audio_write, /* write */
NULL, /* seek */
audio_ioctl, /* ioctl */
audio_mmap, /* mmap */
};
/****************************************************************************
@@ -761,6 +764,68 @@ static int audio_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
return ret;
}
/****************************************************************************
* Name: audio_munmap
*
* Description:
* The standard unmap method.
*
****************************************************************************/
static int audio_munmap(FAR struct task_group_s *group,
FAR struct mm_map_entry_s *entry, FAR void *start,
size_t length)
{
return mm_map_remove(get_group_mm(group), entry);
}
/****************************************************************************
* Name: audio_mmap
*
* Description:
* The standard mmap method.
*
****************************************************************************/
static int audio_mmap(FAR struct file *filep, FAR struct mm_map_entry_s *map)
{
FAR struct inode *inode = filep->f_inode;
FAR struct audio_upperhalf_s *upper = inode->i_private;
int ret;
ret = nxmutex_lock(&upper->lock);
if (ret < 0)
{
return ret;
}
/* Return the address corresponding to the start of frame buffer. */
if (upper->apbs != NULL && map->length == upper->apbs[0]->nmaxbytes)
{
ret = map->offset / upper->apbs[0]->nmaxbytes;
DEBUGASSERT(ret < upper->periods);
map->vaddr = (FAR char *)upper->apbs[ret]->samp;
map->munmap = audio_munmap;
ret = mm_map_add(get_current_mm(), map);
}
else if (map->length == sizeof(struct audio_status_s))
{
map->vaddr = (FAR char *)upper->status;
map->munmap = audio_munmap;
ret = mm_map_add(get_current_mm(), map);
}
else
{
ret = -EINVAL;
}
nxmutex_unlock(&upper->lock);
return ret;
}
/****************************************************************************
* Name: audio_allocbuffer
*