drivers/rpmsg/rpmsg_internal.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * remote processor messaging bus internals
   4  *
   5  * Copyright (C) 2011 Texas Instruments, Inc.
   6  * Copyright (C) 2011 Google, Inc.
   7  *
   8  * Ohad Ben-Cohen <ohad@wizery.com>
   9  * Brian Swetland <swetland@google.com>
  10  */
  11
  12 #ifndef __RPMSG_INTERNAL_H__
  13 #define __RPMSG_INTERNAL_H__
  14
  15 #include <linux/rpmsg.h>
  16 #include <linux/poll.h>
  17
  18 #define to_rpmsg_device(d) container_of(d, struct rpmsg_device, dev)
  19 #define to_rpmsg_driver(d) container_of(d, struct rpmsg_driver, drv)
  20
  21 /**
  22  * struct rpmsg_device_ops - indirection table for the rpmsg_device operations
  23  * @create_ept:         create backend-specific endpoint, requried
  24  * @announce_create:    announce presence of new channel, optional
  25  * @announce_destroy:   announce destruction of channel, optional
  26  *
  27  * Indirection table for the operations that a rpmsg backend should implement.
  28  * @announce_create and @announce_destroy are optional as the backend might
  29  * advertise new channels implicitly by creating the endpoints.
  30  */
  31 struct rpmsg_device_ops {
  32         struct rpmsg_endpoint *(*create_ept)(struct rpmsg_device *rpdev,
  33                                             rpmsg_rx_cb_t cb, void *priv,
  34                                             struct rpmsg_channel_info chinfo);
  35
  36         int (*announce_create)(struct rpmsg_device *ept);
  37         int (*announce_destroy)(struct rpmsg_device *ept);
  38 };
  39
  40 /**
  41  * struct rpmsg_endpoint_ops - indirection table for rpmsg_endpoint operations
  42  * @destroy_ept:        destroy the given endpoint, required
  43  * @send:               see @rpmsg_send(), required
  44  * @sendto:             see @rpmsg_sendto(), optional
  45  * @send_offchannel:    see @rpmsg_send_offchannel(), optional
  46  * @trysend:            see @rpmsg_trysend(), required
  47  * @trysendto:          see @rpmsg_trysendto(), optional
  48  * @trysend_offchannel: see @rpmsg_trysend_offchannel(), optional
  49  *
  50  * Indirection table for the operations that a rpmsg backend should implement.
  51  * In addition to @destroy_ept, the backend must at least implement @send and
  52  * @trysend, while the variants sending data off-channel are optional.
  53  */
  54 struct rpmsg_endpoint_ops {
  55         void (*destroy_ept)(struct rpmsg_endpoint *ept);
  56
  57         int (*send)(struct rpmsg_endpoint *ept, void *data, int len);
  58         int (*sendto)(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
  59         int (*send_offchannel)(struct rpmsg_endpoint *ept, u32 src, u32 dst,
  60                                   void *data, int len);
  61
  62         int (*trysend)(struct rpmsg_endpoint *ept, void *data, int len);
  63         int (*trysendto)(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
  64         int (*trysend_offchannel)(struct rpmsg_endpoint *ept, u32 src, u32 dst,
  65                              void *data, int len);
  66         __poll_t (*poll)(struct rpmsg_endpoint *ept, struct file *filp,
  67                              poll_table *wait);
  68 };
  69
  70 int rpmsg_register_device(struct rpmsg_device *rpdev);
  71 int rpmsg_unregister_device(struct device *parent,
  72                             struct rpmsg_channel_info *chinfo);
  73
  74 struct device *rpmsg_find_device(struct device *parent,
  75                                  struct rpmsg_channel_info *chinfo);
  76
  77 /**
  78  * rpmsg_chrdev_register_device() - register chrdev device based on rpdev
  79  * @rpdev:      prepared rpdev to be used for creating endpoints
  80  *
  81  * This function wraps rpmsg_register_device() preparing the rpdev for use as
  82  * basis for the rpmsg chrdev.
  83  */
  84 static inline int rpmsg_chrdev_register_device(struct rpmsg_device *rpdev)
  85 {
  86         strcpy(rpdev->id.name, "rpmsg_chrdev");
  87         rpdev->driver_override = "rpmsg_chrdev";
  88
  89         return rpmsg_register_device(rpdev);
  90 }
  91
  92 #endif