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driver/noteram: Support poll threshold

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The noteram driver supports setting the poll threshold.

Signed-off-by: yukangzhi <yukangzhi@xiaomi.com>
This commit is contained in:
yukangzhi
2025-03-06 12:25:22 +08:00
committed by Xiang Xiao
parent 890f2e4625
commit 8226e8e8fe
2 changed files with 31 additions and 2 deletions
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Documentation/components/drivers/character/note.rst
+17
View File
@@ -237,6 +237,23 @@ Noteram Device (``/dev/note``)
:return: If success, 0 (``OK``) is returned and the given overwriter mode is set as the current settings.
If failed, a negated ``errno`` is returned.
.. c:macro:: FIONREAD
Get the number of unread bytes in the buffer
:argument: A writable pointer to ``unsigned int`` to receive the number of unread bytes.
:return: If success, 0 (``OK``) is returned and the number of unread bytes is stored into the given pointer.
If failed, a negated ``errno`` is returned.
.. c:macro:: PIPEIOC_POLLINTHRD
Set the poll threshold for POLLIN event
:argument: An unsigned int value specifying the threshold in bytes. When the unread data in the buffer is greater than or equal to this value, POLLIN will be notified.
:return: If success, 0 (``OK``) is returned and the threshold is set. If failed, a negated ``errno`` is returned.
Filter control APIs
===================
drivers/note/noteram_driver.c
+14 -2
View File
@@ -89,6 +89,7 @@ struct noteram_driver_s
FAR uint8_t *ni_buffer;
size_t ni_bufsize;
unsigned int ni_overwrite;
unsigned int threshold;
volatile unsigned int ni_head;
volatile unsigned int ni_tail;
volatile unsigned int ni_read;
@@ -447,6 +448,8 @@ static int noteram_open(FAR struct file *filep)
return -ENOMEM;
}
drv->threshold = sizeof(struct note_common_s);
filep->f_priv = ctx;
noteram_dump_init_context(ctx);
return OK;
@@ -616,6 +619,11 @@ static int noteram_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
}
break;
case PIPEIOC_POLLINTHRD:
drv->threshold = (uint32_t)arg;
ret = OK;
break;
default:
break;
}
@@ -673,7 +681,7 @@ static int noteram_poll(FAR struct file *filep, FAR struct pollfd *fds,
* don't wait for RX.
*/
if (noteram_unread_length(drv) > 0)
if (noteram_unread_length(drv) >= drv->threshold)
{
spin_unlock_irqrestore_notrace(&drv->lock, flags);
poll_notify(&drv->pfd, 1, POLLIN);
@@ -758,7 +766,11 @@ static void noteram_add(FAR struct note_driver_s *driver,
memcpy(drv->ni_buffer, buf + space, notelen - space);
drv->ni_head = noteram_next(drv, head, NOTE_ALIGN(notelen));
spin_unlock_irqrestore_notrace(&drv->lock, flags);
poll_notify(&drv->pfd, 1, POLLIN);
if (drv->pfd && (noteram_unread_length(drv) >= drv->threshold))
{
poll_notify(&drv->pfd, 1, POLLIN);
}
}
/****************************************************************************