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 extern struct class *rpmsg_class;
  22
  23 /**
  24  * struct rpmsg_device_ops - indirection table for the rpmsg_device operations
  25  * @create_channel:     create backend-specific channel, optional
  26  * @release_channel:    release backend-specific channel, optional
  27  * @create_ept:         create backend-specific endpoint, required
  28  * @announce_create:    announce presence of new channel, optional
  29  * @announce_destroy:   announce destruction of channel, optional
  30  *
  31  * Indirection table for the operations that a rpmsg backend should implement.
  32  * @announce_create and @announce_destroy are optional as the backend might
  33  * advertise new channels implicitly by creating the endpoints.
  34  */
  35 struct rpmsg_device_ops {
  36         struct rpmsg_device *(*create_channel)(struct rpmsg_device *rpdev,
  37                                                struct rpmsg_channel_info *chinfo);
  38         int (*release_channel)(struct rpmsg_device *rpdev,
  39                                struct rpmsg_channel_info *chinfo);
  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 *rpdev);
  45         int (*announce_destroy)(struct rpmsg_device *rpdev);
  46 };
  47
  48 /**
  49  * struct rpmsg_endpoint_ops - indirection table for rpmsg_endpoint operations
  50  * @destroy_ept:        see @rpmsg_destroy_ept(), 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  * @poll:               see @rpmsg_poll(), optional
  58  * @get_mtu:            see @rpmsg_get_mtu(), optional
  59  *
  60  * Indirection table for the operations that a rpmsg backend should implement.
  61  * In addition to @destroy_ept, the backend must at least implement @send and
  62  * @trysend, while the variants sending data off-channel are optional.
  63  */
  64 struct rpmsg_endpoint_ops {
  65         void (*destroy_ept)(struct rpmsg_endpoint *ept);
  66
  67         int (*send)(struct rpmsg_endpoint *ept, void *data, int len);
  68         int (*sendto)(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
  69         int (*send_offchannel)(struct rpmsg_endpoint *ept, u32 src, u32 dst,
  70                                   void *data, int len);
  71
  72         int (*trysend)(struct rpmsg_endpoint *ept, void *data, int len);
  73         int (*trysendto)(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
  74         int (*trysend_offchannel)(struct rpmsg_endpoint *ept, u32 src, u32 dst,
  75                              void *data, int len);
  76         __poll_t (*poll)(struct rpmsg_endpoint *ept, struct file *filp,
  77                              poll_table *wait);
  78         ssize_t (*get_mtu)(struct rpmsg_endpoint *ept);
  79 };
  80
  81 struct device *rpmsg_find_device(struct device *parent,
  82                                  struct rpmsg_channel_info *chinfo);
  83
  84 struct rpmsg_device *rpmsg_create_channel(struct rpmsg_device *rpdev,
  85                                           struct rpmsg_channel_info *chinfo);
  86 int rpmsg_release_channel(struct rpmsg_device *rpdev,
  87                           struct rpmsg_channel_info *chinfo);
  88 /**
  89  * rpmsg_ctrldev_register_device() - register a char device for control based on rpdev
  90  * @rpdev:      prepared rpdev to be used for creating endpoints
  91  *
  92  * This function wraps rpmsg_register_device() preparing the rpdev for use as
  93  * basis for the rpmsg chrdev.
  94  */
  95 static inline int rpmsg_ctrldev_register_device(struct rpmsg_device *rpdev)
  96 {
  97         return rpmsg_register_device_override(rpdev, "rpmsg_ctrl");
  98 }
  99
 100 #endif