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e44d2f5df9
The write operation in misc_ops already takes a "const void *" buffer, but misc_write() takes a mutable "void *". There's no reason for this, so make misc_write() consistent with the standard write() prototype. Signed-off-by: John Keeping <john@metanate.com> Reviewed-by: Simon Glass <sjg@chromium.org>
146 lines
4.8 KiB
C
146 lines
4.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
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*/
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#ifndef _MISC_H_
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#define _MISC_H_
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struct udevice;
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/**
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* misc_read() - Read the device to buffer, optional.
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* @dev: the device
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* @offset: offset to read the device
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* @buf: pointer to data buffer
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* @size: data size in bytes to read the device
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*
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* Return: number of bytes read if OK (may be 0 if EOF), -ve on error
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*/
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int misc_read(struct udevice *dev, int offset, void *buf, int size);
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/**
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* misc_write() - Write buffer to the device, optional.
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* @dev: the device
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* @offset: offset to write the device
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* @buf: pointer to data buffer
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* @size: data size in bytes to write the device
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*
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* Return: number of bytes written if OK (may be < @size), -ve on error
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*/
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int misc_write(struct udevice *dev, int offset, const void *buf, int size);
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/**
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* misc_ioctl() - Assert command to the device, optional.
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* @dev: the device
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* @request: command to be sent to the device
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* @buf: pointer to buffer related to the request
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*
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* Return: 0 if OK, -ve on error
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*/
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int misc_ioctl(struct udevice *dev, unsigned long request, void *buf);
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/**
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* misc_call() - Send a message to the device and wait for a response.
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* @dev: the device.
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* @msgid: the message ID/number to send.
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* @tx_msg: the request/transmit message payload.
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* @tx_size: the size of the buffer pointed at by tx_msg.
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* @rx_msg: the buffer to receive the response message payload. May be NULL if
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* the caller only cares about the error code.
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* @rx_size: the size of the buffer pointed at by rx_msg.
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*
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* The caller provides the message type/ID and payload to be sent.
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* The callee constructs any message header required, transmits it to the
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* target, waits for a response, checks any error code in the response,
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* strips any message header from the response, and returns the error code
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* (or a parsed version of it) and the response message payload.
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*
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* Return: the response message size if OK, -ve on error
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*/
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int misc_call(struct udevice *dev, int msgid, void *tx_msg, int tx_size,
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void *rx_msg, int rx_size);
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/**
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* misc_set_enabled() - Enable or disable a device.
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* @dev: the device to enable or disable.
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* @val: the flag that tells the driver to either enable or disable the device.
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*
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* The semantics of "disable" and "enable" should be understood here as
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* activating or deactivating the device's primary function, hence a "disabled"
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* device should be dormant, but still answer to commands and queries.
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*
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* A probed device may start in a disabled or enabled state, depending on the
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* driver and hardware.
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*
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* Return: -ve on error, 0 if the previous state was "disabled", 1 if the
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* previous state was "enabled"
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*/
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int misc_set_enabled(struct udevice *dev, bool val);
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/*
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* struct misc_ops - Driver model Misc operations
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*
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* The uclass interface is implemented by all miscellaneous devices which
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* use driver model.
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*/
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struct misc_ops {
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/**
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* Read the device to buffer, optional.
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* @dev: the device
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* @offset: offset to read the device
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* @buf: pointer to data buffer
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* @size: data size in bytes to read the device
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*
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* Return: number of bytes read if OK (may be 0 if EOF), -ve on error
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*/
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int (*read)(struct udevice *dev, int offset, void *buf, int size);
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/**
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* Write buffer to the device, optional.
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* @dev: the device
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* @offset: offset to write the device
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* @buf: pointer to data buffer
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* @size: data size in bytes to write the device
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*
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* Return: number of bytes written if OK (may be < @size), -ve on error
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*/
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int (*write)(struct udevice *dev, int offset, const void *buf,
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int size);
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/**
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* Assert command to the device, optional.
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* @dev: the device
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* @request: command to be sent to the device
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* @buf: pointer to buffer related to the request
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*
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* Return: 0 if OK, -ve on error
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*/
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int (*ioctl)(struct udevice *dev, unsigned long request, void *buf);
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/**
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* Send a message to the device and wait for a response.
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* @dev: the device
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* @msgid: the message ID/number to send
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* @tx_msg: the request/transmit message payload
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* @tx_size: the size of the buffer pointed at by tx_msg
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* @rx_msg: the buffer to receive the response message payload. May be
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* NULL if the caller only cares about the error code.
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* @rx_size: the size of the buffer pointed at by rx_msg
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*
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* Return: the response message size if OK, -ve on error
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*/
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int (*call)(struct udevice *dev, int msgid, void *tx_msg, int tx_size,
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void *rx_msg, int rx_size);
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/**
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* Enable or disable a device, optional.
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* @dev: the device to enable.
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* @val: the flag that tells the driver to either enable or disable the
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* device.
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*
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* Return: -ve on error, 0 if the previous state was "disabled", 1 if
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* the previous state was "enabled"
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*/
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int (*set_enabled)(struct udevice *dev, bool val);
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};
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#endif /* _MISC_H_ */
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