Commit 84d58132 authored by Bjorn Andersson's avatar Bjorn Andersson
Browse files

rpmsg: Introduce "poll" to endpoint ops 



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: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
parent 5e53c42c

drivers/rpmsg/rpmsg_core.c

+20 −0
Original line number Diff line number Diff line
@@ -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

drivers/rpmsg/rpmsg_internal.h

+3 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/rpmsg.h

+13 −0
Original line number Diff line number Diff line
@@ -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 */