drivers/rpmsg/rpmsg_internal.h

   1 /*
   2  * remote processor messaging bus internals
   3  *
   4  * Copyright (C) 2011 Texas Instruments, Inc.
   5  * Copyright (C) 2011 Google, Inc.
   6  *
   7  * Ohad Ben-Cohen <ohad@wizery.com>
   8  * Brian Swetland <swetland@google.com>
   9  *
  10  * This software is licensed under the terms of the GNU General Public
  11  * License version 2, as published by the Free Software Foundation, and
  12  * may be copied, distributed, and modified under those terms.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  */
  19
  20 #ifndef __RPMSG_INTERNAL_H__
  21 #define __RPMSG_INTERNAL_H__
  22
  23 #include <linux/rpmsg.h>
  24 #include <linux/poll.h>
  25
  26 #define to_rpmsg_device(d) container_of(d, struct rpmsg_device, dev)
  27 #define to_rpmsg_driver(d) container_of(d, struct rpmsg_driver, drv)
  28
  29 /**
  30  * struct rpmsg_device_ops - indirection table for the rpmsg_device operations
  31  * @create_ept:         create backend-specific endpoint, requried
  32  * @announce_create:    announce presence of new channel, optional
  33  * @announce_destroy:   announce destruction of channel, optional
  34  *
  35  * Indirection table for the operations that a rpmsg backend should implement.
  36  * @announce_create and @announce_destroy are optional as the backend might
  37  * advertise new channels implicitly by creating the endpoints.
  38  */
  39 struct rpmsg_device_ops {
  40         struct rpmsg_endpoint *(*create_ept)(struct rpmsg_device *rpdev,
  41                                             rpmsg_rx_cb_t cb, void *priv,
  42                                             struct rpmsg_channel_info chinfo);
  43
  44         int (*announce_create)(struct rpmsg_device *ept);
  45         int (*announce_destroy)(struct rpmsg_device *ept);
  46 };
  47
  48 /**
  49  * struct rpmsg_endpoint_ops - indirection table for rpmsg_endpoint operations
  50  * @destroy_ept:        destroy the given endpoint, required
  51  * @send:               see @rpmsg_send(), required
  52  * @sendto:             see @rpmsg_sendto(), optional
  53  * @send_offchannel:    see @rpmsg_send_offchannel(), optional
  54  * @trysend:            see @rpmsg_trysend(), required
  55  * @trysendto:          see @rpmsg_trysendto(), optional
  56  * @trysend_offchannel: see @rpmsg_trysend_offchannel(), optional
  57  *
  58  * Indirection table for the operations that a rpmsg backend should implement.
  59  * In addition to @destroy_ept, the backend must at least implement @send and
  60  * @trysend, while the variants sending data off-channel are optional.
  61  */
  62 struct rpmsg_endpoint_ops {
  63         void (*destroy_ept)(struct rpmsg_endpoint *ept);
  64
  65         int (*send)(struct rpmsg_endpoint *ept, void *data, int len);
  66         int (*sendto)(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
  67         int (*send_offchannel)(struct rpmsg_endpoint *ept, u32 src, u32 dst,
  68                                   void *data, int len);
  69
  70         int (*trysend)(struct rpmsg_endpoint *ept, void *data, int len);
  71         int (*trysendto)(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
  72         int (*trysend_offchannel)(struct rpmsg_endpoint *ept, u32 src, u32 dst,
  73                              void *data, int len);
  74         unsigned int (*poll)(struct rpmsg_endpoint *ept, struct file *filp,
  75                              poll_table *wait);
  76 };
  77
  78 int rpmsg_register_device(struct rpmsg_device *rpdev);
  79 int rpmsg_unregister_device(struct device *parent,
  80                             struct rpmsg_channel_info *chinfo);
  81
  82 struct device *rpmsg_find_device(struct device *parent,
  83                                  struct rpmsg_channel_info *chinfo);
  84
  85 /**
  86  * rpmsg_chrdev_register_device() - register chrdev device based on rpdev
  87  * @rpdev:      prepared rpdev to be used for creating endpoints
  88  *
  89  * This function wraps rpmsg_register_device() preparing the rpdev for use as
  90  * basis for the rpmsg chrdev.
  91  */
  92 static inline int rpmsg_chrdev_register_device(struct rpmsg_device *rpdev)
  93 {
  94         strcpy(rpdev->id.name, "rpmsg_chrdev");
  95         rpdev->driver_override = "rpmsg_chrdev";
  96
  97         return rpmsg_register_device(rpdev);
  98 }
  99
 100 #endif