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Release 4.16 include/linux/rpmsg.h

Directory: include/linux
/*
 * Remote processor messaging
 *
 * Copyright (C) 2011 Texas Instruments, Inc.
 * Copyright (C) 2011 Google, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in
 *   the documentation and/or other materials provided with the
 *   distribution.
 * * Neither the name Texas Instruments nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _LINUX_RPMSG_H

#define _LINUX_RPMSG_H

#include <linux/types.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/mod_devicetable.h>
#include <linux/kref.h>
#include <linux/mutex.h>
#include <linux/poll.h>


#define RPMSG_ADDR_ANY		0xFFFFFFFF

struct rpmsg_device;
struct rpmsg_endpoint;
struct rpmsg_device_ops;
struct rpmsg_endpoint_ops;

/**
 * struct rpmsg_channel_info - channel info representation
 * @name: name of service
 * @src: local address
 * @dst: destination address
 */

struct rpmsg_channel_info {
	
char name[RPMSG_NAME_SIZE];
	
u32 src;
	
u32 dst;
};

/**
 * rpmsg_device - device that belong to the rpmsg bus
 * @dev: the device struct
 * @id: device id (used to match between rpmsg drivers and devices)
 * @driver_override: driver name to force a match
 * @src: local address
 * @dst: destination address
 * @ept: the rpmsg endpoint of this channel
 * @announce: if set, rpmsg will announce the creation/removal of this channel
 */

struct rpmsg_device {
	
struct device dev;
	
struct rpmsg_device_id id;
	
char *driver_override;
	
u32 src;
	
u32 dst;
	
struct rpmsg_endpoint *ept;
	
bool announce;

	
const struct rpmsg_device_ops *ops;
};


typedef int (*rpmsg_rx_cb_t)(struct rpmsg_device *, void *, int, void *, u32);

/**
 * struct rpmsg_endpoint - binds a local rpmsg address to its user
 * @rpdev: rpmsg channel device
 * @refcount: when this drops to zero, the ept is deallocated
 * @cb: rx callback handler
 * @cb_lock: must be taken before accessing/changing @cb
 * @addr: local rpmsg address
 * @priv: private data for the driver's use
 *
 * In essence, an rpmsg endpoint represents a listener on the rpmsg bus, as
 * it binds an rpmsg address with an rx callback handler.
 *
 * Simple rpmsg drivers shouldn't use this struct directly, because
 * things just work: every rpmsg driver provides an rx callback upon
 * registering to the bus, and that callback is then bound to its rpmsg
 * address when the driver is probed. When relevant inbound messages arrive
 * (i.e. messages which their dst address equals to the src address of
 * the rpmsg channel), the driver's handler is invoked to process it.
 *
 * More complicated drivers though, that do need to allocate additional rpmsg
 * addresses, and bind them to different rx callbacks, must explicitly
 * create additional endpoints by themselves (see rpmsg_create_ept()).
 */

struct rpmsg_endpoint {
	
struct rpmsg_device *rpdev;
	
struct kref refcount;
	
rpmsg_rx_cb_t cb;
	
struct mutex cb_lock;
	
u32 addr;
	
void *priv;

	
const struct rpmsg_endpoint_ops *ops;
};

/**
 * struct rpmsg_driver - rpmsg driver struct
 * @drv: underlying device driver
 * @id_table: rpmsg ids serviced by this driver
 * @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
 */

struct rpmsg_driver {
	
struct device_driver drv;
	
const struct rpmsg_device_id *id_table;
	
int (*probe)(struct rpmsg_device *dev);
	
void (*remove)(struct rpmsg_device *dev);
	
int (*callback)(struct rpmsg_device *, void *, int, void *, u32);
};

#if IS_ENABLED(CONFIG_RPMSG)

int register_rpmsg_device(struct rpmsg_device *dev);
void unregister_rpmsg_device(struct rpmsg_device *dev);
int __register_rpmsg_driver(struct rpmsg_driver *drv, struct module *owner);
void unregister_rpmsg_driver(struct rpmsg_driver *drv);
void rpmsg_destroy_ept(struct rpmsg_endpoint *);
struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *,
					rpmsg_rx_cb_t cb, void *priv,
					struct rpmsg_channel_info chinfo);

int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len);
int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
			  void *data, int len);

int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len);
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);

__poll_t rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp,
			poll_table *wait);

#else


static inline int register_rpmsg_device(struct rpmsg_device *dev) { return -ENXIO; }

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Björn Andersson16100.00%1100.00%
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static inline void unregister_rpmsg_device(struct rpmsg_device *dev) { /* This shouldn't be possible */ WARN_ON(1); }

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Björn Andersson18100.00%1100.00%
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static inline int __register_rpmsg_driver(struct rpmsg_driver *drv, struct module *owner) { /* This shouldn't be possible */ WARN_ON(1); return -ENXIO; }

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static inline void unregister_rpmsg_driver(struct rpmsg_driver *drv) { /* This shouldn't be possible */ WARN_ON(1); }

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Björn Andersson18100.00%1100.00%
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static inline void rpmsg_destroy_ept(struct rpmsg_endpoint *ept) { /* This shouldn't be possible */ WARN_ON(1); }

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Björn Andersson18100.00%1100.00%
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static inline struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *rpdev, rpmsg_rx_cb_t cb, void *priv, struct rpmsg_channel_info chinfo) { /* This shouldn't be possible */ WARN_ON(1); return ERR_PTR(-ENXIO); }

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Björn Andersson38100.00%1100.00%
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static inline int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len) { /* This shouldn't be possible */ WARN_ON(1); return -ENXIO; }

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Björn Andersson29100.00%1100.00%
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static inline int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst) { /* This shouldn't be possible */ WARN_ON(1); return -ENXIO; }

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Björn Andersson32100.00%1100.00%
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static inline int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, void *data, int len) { /* This shouldn't be possible */ WARN_ON(1); return -ENXIO; }

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Björn Andersson35100.00%1100.00%
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static inline int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len) { /* This shouldn't be possible */ WARN_ON(1); return -ENXIO; }

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Björn Andersson29100.00%1100.00%
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static inline int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst) { /* This shouldn't be possible */ WARN_ON(1); return -ENXIO; }

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Björn Andersson32100.00%1100.00%
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static inline int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, void *data, int len) { /* This shouldn't be possible */ WARN_ON(1); return -ENXIO; }

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Björn Andersson35100.00%1100.00%
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static inline __poll_t rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp, poll_table *wait) { /* This shouldn't be possible */ WARN_ON(1); return 0; }

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Björn Andersson2996.67%150.00%
Al Viro13.33%150.00%
Total30100.00%2100.00%

#endif /* IS_ENABLED(CONFIG_RPMSG) */ /* use a macro to avoid include chaining to get THIS_MODULE */ #define register_rpmsg_driver(drv) \ __register_rpmsg_driver(drv, THIS_MODULE) /** * module_rpmsg_driver() - Helper macro for registering an rpmsg driver * @__rpmsg_driver: rpmsg_driver struct * * Helper macro for rpmsg drivers which do not do anything special in module * init/exit. This eliminates a lot of boilerplate. Each module may only * use this macro once, and calling it replaces module_init() and module_exit() */ #define module_rpmsg_driver(__rpmsg_driver) \ module_driver(__rpmsg_driver, register_rpmsg_driver, \ unregister_rpmsg_driver) #endif /* _LINUX_RPMSG_H */

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Björn Andersson50462.30%1066.67%
Ohad Ben-Cohen29736.71%320.00%
Andrew F. Davis60.74%16.67%
Al Viro20.25%16.67%
Total809100.00%15100.00%
Directory: include/linux
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