1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2013-2014 Linaro Ltd.
4  * Author: Jassi Brar <jassisinghbrar@gmail.com>
5  */
6 
7 #ifndef __MAILBOX_CLIENT_H
8 #define __MAILBOX_CLIENT_H
9 
10 #include <linux/of.h>
11 #include <linux/device.h>
12 
13 struct mbox_chan;
14 
15 /**
16  * struct mbox_client - User of a mailbox
17  * @dev:		The client device
18  * @tx_block:		If the mbox_send_message should block until data is
19  *			transmitted.
20  * @tx_tout:		Max block period in ms before TX is assumed failure
21  * @knows_txdone:	If the client could run the TX state machine. Usually
22  *			if the client receives some ACK packet for transmission.
23  *			Unused if the controller already has TX_Done/RTR IRQ.
24  * @rx_callback:	Atomic callback to provide client the data received
25  * @tx_prepare: 	Atomic callback to ask client to prepare the payload
26  *			before initiating the transmission if required.
27  * @tx_done:		Atomic callback to tell client of data transmission
28  */
29 struct mbox_client {
30 	struct device *dev;
31 	bool tx_block;
32 	unsigned long tx_tout;
33 	bool knows_txdone;
34 
35 	void (*rx_callback)(struct mbox_client *cl, void *mssg);
36 	void (*tx_prepare)(struct mbox_client *cl, void *mssg);
37 	void (*tx_done)(struct mbox_client *cl, void *mssg, int r);
38 };
39 
40 int mbox_bind_client(struct mbox_chan *chan, struct mbox_client *cl);
41 struct mbox_chan *mbox_request_channel_byname(struct mbox_client *cl,
42 					      const char *name);
43 struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index);
44 int mbox_send_message(struct mbox_chan *chan, void *mssg);
45 int mbox_flush(struct mbox_chan *chan, unsigned long timeout);
46 void mbox_client_txdone(struct mbox_chan *chan, int r); /* atomic */
47 bool mbox_client_peek_data(struct mbox_chan *chan); /* atomic */
48 void mbox_free_channel(struct mbox_chan *chan); /* may sleep */
49 
50 #endif /* __MAILBOX_CLIENT_H */
51