dm: implement a Miscellaneous uclass

Implement a Miscellaneous uclass with generic read or
write operations. This class is used only for those
do not fit other more general classes.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Simon Glass <sjg@chromium.org>

1 files changed, 51 insertions, 0 deletions

diff --git a/drivers/misc/misc-uclass.c b/drivers/misc/misc-uclass.c
new file mode 100644
index 00000000000..13a6ea508b1
--- /dev/null
+++ b/drivers/misc/misc-uclass.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <misc.h>
+
+/*
+ * Implement a  miscellaneous uclass for those do not fit other more
+ * general classes. A set of generic read, write and ioctl methods may
+ * be used to access the device.
+ */
+
+int misc_read(struct udevice *dev, int offset, void *buf, int size)
+{
+	const struct misc_ops *ops = device_get_ops(dev);
+
+	if (!ops->read)
+		return -ENOSYS;
+
+	return ops->read(dev, offset, buf, size);
+}
+
+int misc_write(struct udevice *dev, int offset, void *buf, int size)
+{
+	const struct misc_ops *ops = device_get_ops(dev);
+
+	if (!ops->write)
+		return -ENOSYS;
+
+	return ops->write(dev, offset, buf, size);
+}
+
+int misc_ioctl(struct udevice *dev, unsigned long request, void *buf)
+{
+	const struct misc_ops *ops = device_get_ops(dev);
+
+	if (!ops->ioctl)
+		return -ENOSYS;
+
+	return ops->ioctl(dev, request, buf);
+}
+
+UCLASS_DRIVER(misc) = {
+	.id		= UCLASS_MISC,
+	.name		= "misc",
+};