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rpmsg: Introduce "poll" to endpoint ops

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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
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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 */