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dm: implement a Miscellaneous uclass

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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>
This commit is contained in:
Thomas Chou
2015-10-07 20:20:51 +08:00
parent 2e2da4c67d
commit 4395e06eb9
5 changed files with 141 additions and 0 deletions
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79
include/misc.h Normal file
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/*
* Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _MISC_H_
#define _MISC_H_
/*
* Read the device to buffer, optional.
*
* @dev: the device
* @offset: offset to read the device
* @buf: pointer to data buffer
* @size: data size in bytes to read the device
* @return: 0 if OK, -ve on error
*/
int misc_read(struct udevice *dev, int offset, void *buf, int size);
/*
* Write buffer to the device, optional.
*
* @dev: the device
* @offset: offset to write the device
* @buf: pointer to data buffer
* @size: data size in bytes to write the device
* @return: 0 if OK, -ve on error
*/
int misc_write(struct udevice *dev, int offset, void *buf, int size);
/*
* Assert command to the device, optional.
*
* @dev: the device
* @request: command to be sent to the device
* @buf: pointer to buffer related to the requset
* @return: 0 if OK, -ve on error
*/
int misc_ioctl(struct udevice *dev, unsigned long request, void *buf);
/*
* struct misc_ops - Driver model Misc operations
*
* The uclass interface is implemented by all miscellaneous devices which
* use driver model.
*/
struct misc_ops {
/*
* Read the device to buffer, optional.
*
* @dev: the device
* @offset: offset to read the device
* @buf: pointer to data buffer
* @size: data size in bytes to read the device
* @return: 0 if OK, -ve on error
*/
int (*read)(struct udevice *dev, int offset, void *buf, int size);
/*
* Write buffer to the device, optional.
*
* @dev: the device
* @offset: offset to write the device
* @buf: pointer to data buffer
* @size: data size in bytes to write the device
* @return: 0 if OK, -ve on error
*/
int (*write)(struct udevice *dev, int offset, const void *buf,
int size);
/*
* Assert command to the device, optional.
*
* @dev: the device
* @request: command to be sent to the device
* @buf: pointer to buffer related to the requset
* @return: 0 if OK, -ve on error
*/
int (*ioctl)(struct udevice *dev, unsigned long request, void *buf);
};
#endif /* _MISC_H_ */