leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

rpmsg: Introduce "poll" to endpoint ops

Browse Source 
This allows rpmsg backends to implement polling of the outgoing buffer,
which provides poll support to user space when using the rpmsg character
device.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Bjorn Andersson 2017-01-11 06:35:10 -08:00
parent 5e53c42c33
commit 84d58132d2
3 changed files with 36 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/rpmsg/rpmsg_core.c
View File

@ -239,6 +239,26 @@ int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
}
EXPORT_SYMBOL(rpmsg_trysendto);
/**
* rpmsg_poll() - poll the endpoint's send buffers
* @ept: the rpmsg endpoint
* @filp: file for poll_wait()
* @wait: poll_table for poll_wait()
*
* Returns mask representing the current state of the endpoint's send buffers
*/
unsigned int rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp,
poll_table *wait)
{
if (WARN_ON(!ept))
return 0;
if (!ept->ops->poll)
return 0;
return ept->ops->poll(ept, filp, wait);
}
EXPORT_SYMBOL(rpmsg_poll);
/**
* rpmsg_send_offchannel() - send a message using explicit src/dst addresses
* @ept: the rpmsg endpoint

3
drivers/rpmsg/rpmsg_internal.h
View File

@ -21,6 +21,7 @@
#define __RPMSG_INTERNAL_H__
#include <linux/rpmsg.h>
#include <linux/poll.h>
#define to_rpmsg_device(d) container_of(d, struct rpmsg_device, dev)
#define to_rpmsg_driver(d) container_of(d, struct rpmsg_driver, drv)
@ -70,6 +71,8 @@ struct rpmsg_endpoint_ops {
int (*trysendto)(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
int (*trysend_offchannel)(struct rpmsg_endpoint *ept, u32 src, u32 dst,
void *data, int len);
unsigned int (*poll)(struct rpmsg_endpoint *ept, struct file *filp,
poll_table *wait);
};
int rpmsg_register_device(struct rpmsg_device *rpdev);

13
include/linux/rpmsg.h
View File

@ -41,6 +41,7 @@
#include <linux/mod_devicetable.h>
#include <linux/kref.h>
#include <linux/mutex.h>
#include <linux/poll.h>
#define RPMSG_ADDR_ANY 0xFFFFFFFF
@ -156,6 +157,9 @@ int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
void *data, int len);
unsigned int rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp,
poll_table *wait);
#else
static inline int register_rpmsg_device(struct rpmsg_device *dev)
@ -254,6 +258,15 @@ static inline int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src,
return -ENXIO;
}
static inline unsigned int rpmsg_poll(struct rpmsg_endpoint *ept,
struct file *filp, poll_table *wait)
{
/* This shouldn't be possible */
WARN_ON(1);
return 0;
}
#endif /* IS_ENABLED(CONFIG_RPMSG) */
/* use a macro to avoid include chaining to get THIS_MODULE */