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84d58132d2
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>
289 lines
8.4 KiB
C
289 lines
8.4 KiB
C
/*
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* Remote processor messaging
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*
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* Copyright (C) 2011 Texas Instruments, Inc.
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* Copyright (C) 2011 Google, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name Texas Instruments nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LINUX_RPMSG_H
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#define _LINUX_RPMSG_H
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/mod_devicetable.h>
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#include <linux/kref.h>
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#include <linux/mutex.h>
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#include <linux/poll.h>
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#define RPMSG_ADDR_ANY 0xFFFFFFFF
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struct rpmsg_device;
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struct rpmsg_endpoint;
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struct rpmsg_device_ops;
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struct rpmsg_endpoint_ops;
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/**
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* struct rpmsg_channel_info - channel info representation
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* @name: name of service
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* @src: local address
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* @dst: destination address
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*/
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struct rpmsg_channel_info {
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char name[RPMSG_NAME_SIZE];
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u32 src;
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u32 dst;
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};
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/**
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* rpmsg_device - device that belong to the rpmsg bus
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* @dev: the device struct
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* @id: device id (used to match between rpmsg drivers and devices)
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* @driver_override: driver name to force a match
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* @src: local address
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* @dst: destination address
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* @ept: the rpmsg endpoint of this channel
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* @announce: if set, rpmsg will announce the creation/removal of this channel
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*/
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struct rpmsg_device {
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struct device dev;
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struct rpmsg_device_id id;
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char *driver_override;
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u32 src;
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u32 dst;
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struct rpmsg_endpoint *ept;
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bool announce;
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const struct rpmsg_device_ops *ops;
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};
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typedef int (*rpmsg_rx_cb_t)(struct rpmsg_device *, void *, int, void *, u32);
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/**
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* struct rpmsg_endpoint - binds a local rpmsg address to its user
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* @rpdev: rpmsg channel device
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* @refcount: when this drops to zero, the ept is deallocated
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* @cb: rx callback handler
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* @cb_lock: must be taken before accessing/changing @cb
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* @addr: local rpmsg address
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* @priv: private data for the driver's use
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*
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* In essence, an rpmsg endpoint represents a listener on the rpmsg bus, as
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* it binds an rpmsg address with an rx callback handler.
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*
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* Simple rpmsg drivers shouldn't use this struct directly, because
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* things just work: every rpmsg driver provides an rx callback upon
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* registering to the bus, and that callback is then bound to its rpmsg
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* address when the driver is probed. When relevant inbound messages arrive
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* (i.e. messages which their dst address equals to the src address of
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* the rpmsg channel), the driver's handler is invoked to process it.
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*
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* More complicated drivers though, that do need to allocate additional rpmsg
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* addresses, and bind them to different rx callbacks, must explicitly
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* create additional endpoints by themselves (see rpmsg_create_ept()).
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*/
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struct rpmsg_endpoint {
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struct rpmsg_device *rpdev;
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struct kref refcount;
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rpmsg_rx_cb_t cb;
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struct mutex cb_lock;
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u32 addr;
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void *priv;
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const struct rpmsg_endpoint_ops *ops;
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};
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/**
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* struct rpmsg_driver - rpmsg driver struct
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* @drv: underlying device driver
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* @id_table: rpmsg ids serviced by this driver
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* @probe: invoked when a matching rpmsg channel (i.e. device) is found
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* @remove: invoked when the rpmsg channel is removed
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* @callback: invoked when an inbound message is received on the channel
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*/
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struct rpmsg_driver {
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struct device_driver drv;
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const struct rpmsg_device_id *id_table;
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int (*probe)(struct rpmsg_device *dev);
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void (*remove)(struct rpmsg_device *dev);
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int (*callback)(struct rpmsg_device *, void *, int, void *, u32);
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};
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#if IS_ENABLED(CONFIG_RPMSG)
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int register_rpmsg_device(struct rpmsg_device *dev);
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void unregister_rpmsg_device(struct rpmsg_device *dev);
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int __register_rpmsg_driver(struct rpmsg_driver *drv, struct module *owner);
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void unregister_rpmsg_driver(struct rpmsg_driver *drv);
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void rpmsg_destroy_ept(struct rpmsg_endpoint *);
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struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *,
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rpmsg_rx_cb_t cb, void *priv,
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struct rpmsg_channel_info chinfo);
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int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len);
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int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
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int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
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void *data, int len);
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int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len);
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int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
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int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
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void *data, int len);
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unsigned int rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp,
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poll_table *wait);
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#else
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static inline int register_rpmsg_device(struct rpmsg_device *dev)
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{
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return -ENXIO;
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}
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static inline void unregister_rpmsg_device(struct rpmsg_device *dev)
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{
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/* This shouldn't be possible */
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WARN_ON(1);
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}
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static inline int __register_rpmsg_driver(struct rpmsg_driver *drv,
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struct module *owner)
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{
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/* This shouldn't be possible */
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WARN_ON(1);
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return -ENXIO;
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}
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static inline void unregister_rpmsg_driver(struct rpmsg_driver *drv)
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{
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/* This shouldn't be possible */
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WARN_ON(1);
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}
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static inline void rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
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{
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/* This shouldn't be possible */
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WARN_ON(1);
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}
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static inline struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *rpdev,
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rpmsg_rx_cb_t cb,
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void *priv,
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struct rpmsg_channel_info chinfo)
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{
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/* This shouldn't be possible */
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WARN_ON(1);
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return ERR_PTR(-ENXIO);
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}
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static inline int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
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{
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/* This shouldn't be possible */
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WARN_ON(1);
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return -ENXIO;
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}
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static inline int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len,
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u32 dst)
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{
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/* This shouldn't be possible */
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WARN_ON(1);
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return -ENXIO;
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}
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static inline int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src,
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u32 dst, void *data, int len)
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{
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/* This shouldn't be possible */
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WARN_ON(1);
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return -ENXIO;
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}
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static inline int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
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{
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/* This shouldn't be possible */
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WARN_ON(1);
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return -ENXIO;
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}
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static inline int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data,
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int len, u32 dst)
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{
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/* This shouldn't be possible */
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WARN_ON(1);
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return -ENXIO;
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}
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static inline int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src,
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u32 dst, void *data, int len)
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{
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/* This shouldn't be possible */
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WARN_ON(1);
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return -ENXIO;
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}
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static inline unsigned int rpmsg_poll(struct rpmsg_endpoint *ept,
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struct file *filp, poll_table *wait)
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{
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/* This shouldn't be possible */
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WARN_ON(1);
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return 0;
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}
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#endif /* IS_ENABLED(CONFIG_RPMSG) */
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/* use a macro to avoid include chaining to get THIS_MODULE */
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#define register_rpmsg_driver(drv) \
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__register_rpmsg_driver(drv, THIS_MODULE)
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/**
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* module_rpmsg_driver() - Helper macro for registering an rpmsg driver
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* @__rpmsg_driver: rpmsg_driver struct
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*
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* Helper macro for rpmsg drivers which do not do anything special in module
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* init/exit. This eliminates a lot of boilerplate. Each module may only
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* use this macro once, and calling it replaces module_init() and module_exit()
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*/
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#define module_rpmsg_driver(__rpmsg_driver) \
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module_driver(__rpmsg_driver, register_rpmsg_driver, \
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unregister_rpmsg_driver)
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#endif /* _LINUX_RPMSG_H */
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