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misc: add "call" uclass op 

The call op requests that the callee pass a message to the underlying HW
or device, wait for a response, and then pass back the response error code
and message to the callee. It is useful for drivers that represent some
kind of messaging or IPC channel to a remote device.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Stephen Warren 2016-08-08 09:41:33 -06:00 committed by Simon Glass
parent aa26776a2d
commit b647f55420
2 changed files with 46 additions and 0 deletions
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11
drivers/misc/misc-uclass.c
View File

@ -45,6 +45,17 @@ int misc_ioctl(struct udevice *dev, unsigned long request, void *buf)
return ops->ioctl(dev, request, buf);
}
int misc_call(struct udevice *dev, int msgid, void *tx_msg, int tx_size,
void *rx_msg, int rx_size)
{
const struct misc_ops *ops = device_get_ops(dev);
if (!ops->call)
return -ENOSYS;
return ops->call(dev, msgid, tx_msg, tx_size, rx_msg, rx_size);
}
UCLASS_DRIVER(misc) = {
.id = UCLASS_MISC,
.name = "misc",

35
include/misc.h
View File

@ -37,6 +37,27 @@ int misc_write(struct udevice *dev, int offset, void *buf, int size);
*/
int misc_ioctl(struct udevice *dev, unsigned long request, void *buf);
/*
* Send a message to the device and wait for a response.
*
* The caller provides the message type/ID and payload to be sent.
* The callee constructs any message header required, transmits it to the
* target, waits for a response, checks any error code in the response,
* strips any message header from the response, and returns the error code
* (or a parsed version of it) and the response message payload.
*
* @dev: the device.
* @msgid: the message ID/number to send.
* tx_msg: the request/transmit message payload.
* tx_size: the size of the buffer pointed at by tx_msg.
* rx_msg: the buffer to receive the response message payload. May be NULL if
* the caller only cares about the error code.
* rx_size: the size of the buffer pointed at by rx_msg.
* @return the response message size if OK, -ve on error
*/
int misc_call(struct udevice *dev, int msgid, void *tx_msg, int tx_size,
void *rx_msg, int rx_size);
/*
* struct misc_ops - Driver model Misc operations
*
@ -74,6 +95,20 @@ struct misc_ops {
* @return: 0 if OK, -ve on error
*/
int (*ioctl)(struct udevice *dev, unsigned long request, void *buf);
/*
* Send a message to the device and wait for a response.
*
* @dev: the device
* @msgid: the message ID/number to send
* tx_msg: the request/transmit message payload
* tx_size: the size of the buffer pointed at by tx_msg
* rx_msg: the buffer to receive the response message payload. May be
* NULL if the caller only cares about the error code.
* rx_size: the size of the buffer pointed at by rx_msg
* @return the response message size if OK, -ve on error
*/
int (*call)(struct udevice *dev, int msgid, void *tx_msg, int tx_size,
void *rx_msg, int rx_size);
};
#endif /* _MISC_H_ */