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, required
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: see @rpmsg_destroy_ept(), 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 * @poll: see @rpmsg_poll(), optional
50 *
51 * Indirection table for the operations that a rpmsg backend should implement.
52 * In addition to @destroy_ept, the backend must at least implement @send and
53 * @trysend, while the variants sending data off-channel are optional.
54 */
55 struct rpmsg_endpoint_ops {
56 void (*destroy_ept)(struct rpmsg_endpoint *ept);
57
58 int (*send)(struct rpmsg_endpoint *ept, void *data, int len);
59 int (*sendto)(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
60 int (*send_offchannel)(struct rpmsg_endpoint *ept, u32 src, u32 dst,
61 void *data, int len);
62
63 int (*trysend)(struct rpmsg_endpoint *ept, void *data, int len);
64 int (*trysendto)(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
65 int (*trysend_offchannel)(struct rpmsg_endpoint *ept, u32 src, u32 dst,
66 void *data, int len);
67 __poll_t (*poll)(struct rpmsg_endpoint *ept, struct file *filp,
68 poll_table *wait);
69 };
70
71 int rpmsg_register_device(struct rpmsg_device *rpdev);
72 int rpmsg_unregister_device(struct device *parent,
73 struct rpmsg_channel_info *chinfo);
74
75 struct device *rpmsg_find_device(struct device *parent,
76 struct rpmsg_channel_info *chinfo);
77
78 /**
79 * rpmsg_chrdev_register_device() - register chrdev device based on rpdev
80 * @rpdev: prepared rpdev to be used for creating endpoints
81 *
82 * This function wraps rpmsg_register_device() preparing the rpdev for use as
83 * basis for the rpmsg chrdev.
84 */
rpmsg_chrdev_register_device(struct rpmsg_device * rpdev)85 static inline int rpmsg_chrdev_register_device(struct rpmsg_device *rpdev)
86 {
87 strcpy(rpdev->id.name, "rpmsg_chrdev");
88 rpdev->driver_override = "rpmsg_chrdev";
89
90 return rpmsg_register_device(rpdev);
91 }
92
93 #endif
94