5c3bd130ea
RPMSG unifies various transports that provide IPC to a remote proc. Some of these transports require some set of side band signalling in order to meet the specifications of the protocol they implement. The GLINK native transport supports the tty serial signals to start communication with modems that expect to receive the DTR serial signal. Extend the rpmsg core with an interface to send and receive sideband signals for the transports that need it. Bug: 161128971 Link: https://lore.kernel.org/lkml/1593182819-30747-2-git-send-email-deesin@codeaurora.org/ Change-Id: I54539d8ddce1bfaec9016c2bec9b5a1372601995 Signed-off-by: Chris Lew <clew@codeaurora.org> (cherry picked from commit 6839fc80fe1f6564eb6a0fc0fd081d459ec6c61b)
98 lines
3.5 KiB
C
98 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* remote processor messaging bus internals
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*
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* Copyright (c) 2020 The Linux Foundation.
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* Copyright (C) 2011 Texas Instruments, Inc.
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* Copyright (C) 2011 Google, Inc.
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*
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* Ohad Ben-Cohen <ohad@wizery.com>
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* Brian Swetland <swetland@google.com>
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*/
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#ifndef __RPMSG_INTERNAL_H__
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#define __RPMSG_INTERNAL_H__
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#include <linux/rpmsg.h>
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#include <linux/poll.h>
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#define to_rpmsg_device(d) container_of(d, struct rpmsg_device, dev)
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#define to_rpmsg_driver(d) container_of(d, struct rpmsg_driver, drv)
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/**
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* struct rpmsg_device_ops - indirection table for the rpmsg_device operations
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* @create_ept: create backend-specific endpoint, required
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* @announce_create: announce presence of new channel, optional
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* @announce_destroy: announce destruction of channel, optional
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*
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* Indirection table for the operations that a rpmsg backend should implement.
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* @announce_create and @announce_destroy are optional as the backend might
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* advertise new channels implicitly by creating the endpoints.
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*/
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struct rpmsg_device_ops {
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struct rpmsg_endpoint *(*create_ept)(struct rpmsg_device *rpdev,
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rpmsg_rx_cb_t cb, void *priv,
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struct rpmsg_channel_info chinfo);
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int (*announce_create)(struct rpmsg_device *ept);
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int (*announce_destroy)(struct rpmsg_device *ept);
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};
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/**
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* struct rpmsg_endpoint_ops - indirection table for rpmsg_endpoint operations
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* @destroy_ept: see @rpmsg_destroy_ept(), required
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* @send: see @rpmsg_send(), required
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* @sendto: see @rpmsg_sendto(), optional
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* @send_offchannel: see @rpmsg_send_offchannel(), optional
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* @trysend: see @rpmsg_trysend(), required
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* @trysendto: see @rpmsg_trysendto(), optional
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* @trysend_offchannel: see @rpmsg_trysend_offchannel(), optional
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* @poll: see @rpmsg_poll(), optional
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* @get_signals: see @rpmsg_get_signals(), optional
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* @set_signals: see @rpmsg_set_signals(), optional
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*
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* Indirection table for the operations that a rpmsg backend should implement.
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* In addition to @destroy_ept, the backend must at least implement @send and
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* @trysend, while the variants sending data off-channel are optional.
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*/
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struct rpmsg_endpoint_ops {
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void (*destroy_ept)(struct rpmsg_endpoint *ept);
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int (*send)(struct rpmsg_endpoint *ept, void *data, int len);
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int (*sendto)(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
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int (*send_offchannel)(struct rpmsg_endpoint *ept, u32 src, u32 dst,
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void *data, int len);
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int (*trysend)(struct rpmsg_endpoint *ept, void *data, int len);
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int (*trysendto)(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
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int (*trysend_offchannel)(struct rpmsg_endpoint *ept, u32 src, u32 dst,
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void *data, int len);
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__poll_t (*poll)(struct rpmsg_endpoint *ept, struct file *filp,
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poll_table *wait);
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int (*get_signals)(struct rpmsg_endpoint *ept);
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int (*set_signals)(struct rpmsg_endpoint *ept, u32 set, u32 clear);
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};
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int rpmsg_register_device(struct rpmsg_device *rpdev);
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int rpmsg_unregister_device(struct device *parent,
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struct rpmsg_channel_info *chinfo);
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struct device *rpmsg_find_device(struct device *parent,
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struct rpmsg_channel_info *chinfo);
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/**
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* rpmsg_chrdev_register_device() - register chrdev device based on rpdev
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* @rpdev: prepared rpdev to be used for creating endpoints
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*
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* This function wraps rpmsg_register_device() preparing the rpdev for use as
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* basis for the rpmsg chrdev.
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*/
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static inline int rpmsg_chrdev_register_device(struct rpmsg_device *rpdev)
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{
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strcpy(rpdev->id.name, "rpmsg_chrdev");
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rpdev->driver_override = "rpmsg_chrdev";
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return rpmsg_register_device(rpdev);
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}
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#endif
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