include/linux/mailbox_client.h

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