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_channel: create backend-specific channel, optional 24 * @release_channel: release backend-specific channel, optional 25 * @create_ept: create backend-specific endpoint, required 26 * @announce_create: announce presence of new channel, optional 27 * @announce_destroy: announce destruction of channel, optional 28 * 29 * Indirection table for the operations that a rpmsg backend should implement. 30 * @announce_create and @announce_destroy are optional as the backend might 31 * advertise new channels implicitly by creating the endpoints. 32 */ 33 struct rpmsg_device_ops { 34 struct rpmsg_device *(*create_channel)(struct rpmsg_device *rpdev, 35 struct rpmsg_channel_info *chinfo); 36 int (*release_channel)(struct rpmsg_device *rpdev, 37 struct rpmsg_channel_info *chinfo); 38 struct rpmsg_endpoint *(*create_ept)(struct rpmsg_device *rpdev, 39 rpmsg_rx_cb_t cb, void *priv, 40 struct rpmsg_channel_info chinfo); 41 42 int (*announce_create)(struct rpmsg_device *ept); 43 int (*announce_destroy)(struct rpmsg_device *ept); 44 }; 45 46 /** 47 * struct rpmsg_endpoint_ops - indirection table for rpmsg_endpoint operations 48 * @destroy_ept: see @rpmsg_destroy_ept(), required 49 * @send: see @rpmsg_send(), required 50 * @sendto: see @rpmsg_sendto(), optional 51 * @send_offchannel: see @rpmsg_send_offchannel(), optional 52 * @trysend: see @rpmsg_trysend(), required 53 * @trysendto: see @rpmsg_trysendto(), optional 54 * @trysend_offchannel: see @rpmsg_trysend_offchannel(), optional 55 * @poll: see @rpmsg_poll(), optional 56 * @get_mtu: see @rpmsg_get_mtu(), 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 __poll_t (*poll)(struct rpmsg_endpoint *ept, struct file *filp, 75 poll_table *wait); 76 ssize_t (*get_mtu)(struct rpmsg_endpoint *ept); 77 }; 78 79 struct device *rpmsg_find_device(struct device *parent, 80 struct rpmsg_channel_info *chinfo); 81 82 struct rpmsg_device *rpmsg_create_channel(struct rpmsg_device *rpdev, 83 struct rpmsg_channel_info *chinfo); 84 int rpmsg_release_channel(struct rpmsg_device *rpdev, 85 struct rpmsg_channel_info *chinfo); 86 /** 87 * rpmsg_chrdev_register_device() - register chrdev device based on rpdev 88 * @rpdev: prepared rpdev to be used for creating endpoints 89 * 90 * This function wraps rpmsg_register_device() preparing the rpdev for use as 91 * basis for the rpmsg chrdev. 92 */ 93 static inline int rpmsg_chrdev_register_device(struct rpmsg_device *rpdev) 94 { 95 strcpy(rpdev->id.name, "rpmsg_chrdev"); 96 rpdev->driver_override = "rpmsg_chrdev"; 97 98 return rpmsg_register_device(rpdev); 99 } 100 101 #endif 102