/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright ( C ) 2013 - 2014 Linaro Ltd .
* Author : Jassi Brar < jassisinghbrar @ gmail . com >
*/
#ifndef __MAILBOX_CLIENT_H
#define __MAILBOX_CLIENT_H
#include <linux/device.h>
#include <linux/of.h>
struct mbox_chan;
/**
* struct mbox_client - User of a mailbox
* @ dev : The client device
* @ tx_block : If the mbox_send_message should block until data is
* transmitted .
* @ tx_tout : Max block period in ms before TX is assumed failure
* @ knows_txdone : If the client could run the TX state machine . Usually
* if the client receives some ACK packet for transmission .
* Unused if the controller already has TX_Done / RTR IRQ .
* @ rx_callback : Atomic callback to provide client the data received
* @ tx_prepare : Atomic callback to ask client to prepare the payload
* before initiating the transmission if required .
* @ tx_done : Atomic callback to tell client of data transmission
*/
struct mbox_client {
struct device *dev;
bool tx_block;
unsigned long tx_tout;
bool knows_txdone;
void (*rx_callback)(struct mbox_client *cl, void *mssg);
void (*tx_prepare)(struct mbox_client *cl, void *mssg);
void (*tx_done)(struct mbox_client *cl, void *mssg, int r);
};
int mbox_bind_client(struct mbox_chan *chan, struct mbox_client *cl);
struct mbox_chan *mbox_request_channel_byname(struct mbox_client *cl,
const char *name);
struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index);
int mbox_send_message(struct mbox_chan *chan, void *mssg);
int mbox_flush(struct mbox_chan *chan, unsigned long timeout);
void mbox_client_txdone(struct mbox_chan *chan, int r); /* atomic */
bool mbox_client_peek_data(struct mbox_chan *chan); /* atomic */
void mbox_free_channel(struct mbox_chan *chan); /* may sleep */
#endif /* __MAILBOX_CLIENT_H */
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