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ANDROID: rpmsg: core: Add signal API support

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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 6839fc80fe)
This commit is contained in:
Chris Lew
2020-07-14 17:18:30 -07:00
committed by Todd Kjos
parent 15d1929781
commit 5c3bd130ea
3 changed files with 72 additions and 0 deletions
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27
include/linux/rpmsg.h
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@@ -2,6 +2,7 @@
/*
* Remote processor messaging
*
* Copyright (c) 2020 The Linux Foundation.
* Copyright (C) 2011 Texas Instruments, Inc.
* Copyright (C) 2011 Google, Inc.
* All rights reserved.
@@ -60,6 +61,7 @@ struct rpmsg_device {
};
typedef int (*rpmsg_rx_cb_t)(struct rpmsg_device *, void *, int, void *, u32);
typedef int (*rpmsg_rx_sig_t)(struct rpmsg_device *, void *, u32, u32);
/**
* struct rpmsg_endpoint - binds a local rpmsg address to its user
@@ -67,6 +69,7 @@ typedef int (*rpmsg_rx_cb_t)(struct rpmsg_device *, void *, int, void *, u32);
* @refcount: when this drops to zero, the ept is deallocated
* @cb: rx callback handler
* @cb_lock: must be taken before accessing/changing @cb
* @sig_cb: rx serial signal handler
* @addr: local rpmsg address
* @priv: private data for the driver's use
*
@@ -89,6 +92,7 @@ struct rpmsg_endpoint {
struct kref refcount;
rpmsg_rx_cb_t cb;
struct mutex cb_lock;
rpmsg_rx_sig_t sig_cb;
u32 addr;
void *priv;
@@ -102,6 +106,7 @@ struct rpmsg_endpoint {
* @probe: invoked when a matching rpmsg channel (i.e. device) is found
* @remove: invoked when the rpmsg channel is removed
* @callback: invoked when an inbound message is received on the channel
* @signals: invoked when a serial signal change is received on the channel
*/
struct rpmsg_driver {
struct device_driver drv;
@@ -109,6 +114,8 @@ struct rpmsg_driver {
int (*probe)(struct rpmsg_device *dev);
void (*remove)(struct rpmsg_device *dev);
int (*callback)(struct rpmsg_device *, void *, int, void *, u32);
int (*signals)(struct rpmsg_device *rpdev,
void *priv, u32 old, u32 new);
};
#if IS_ENABLED(CONFIG_RPMSG)
@@ -135,6 +142,9 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
__poll_t rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp,
poll_table *wait);
int rpmsg_get_signals(struct rpmsg_endpoint *ept);
int rpmsg_set_signals(struct rpmsg_endpoint *ept, u32 set, u32 clear);
#else
static inline int register_rpmsg_device(struct rpmsg_device *dev)
@@ -242,6 +252,23 @@ static inline __poll_t rpmsg_poll(struct rpmsg_endpoint *ept,
return 0;
}
static inline int rpmsg_get_signals(struct rpmsg_endpoint *ept)
{
/* This shouldn't be possible */
WARN_ON(1);
return -ENXIO;
}
static inline int rpmsg_set_signals(struct rpmsg_endpoint *ept,
u32 set, u32 clear)
{
/* This shouldn't be possible */
WARN_ON(1);
return -ENXIO;
}
#endif /* IS_ENABLED(CONFIG_RPMSG) */
/* use a macro to avoid include chaining to get THIS_MODULE */