bus.h

/*
 * ISHTP bus definitions
 *
 * Copyright (c) 2014-2016, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 */
#ifndef _LINUX_ISHTP_CL_BUS_H
#define _LINUX_ISHTP_CL_BUS_H

#include <linux/device.h>
#include <linux/mod_devicetable.h>

struct ishtp_cl;
struct ishtp_cl_device;
struct ishtp_device;
struct ishtp_msg_hdr;

/**
 * struct ishtp_cl_device - ISHTP device handle
 * @dev:	device pointer
 * @ishtp_dev:	pointer to ishtp device structure to primarily to access
 *		hw device operation callbacks and properties
 * @fw_client:	fw_client pointer to get fw information like protocol name
 *		max message length etc.
 * @device_link: Link to next client in the list on a bus
 * @event_work:	Used to schedule rx event for client
 * @driver_data: Storage driver private data
 * @reference_count:	Used for get/put device
 * @event_cb:	Callback to driver to send events
 *
 * An ishtp_cl_device pointer is returned from ishtp_add_device()
 * and links ISHTP bus clients to their actual host client pointer.
 * Drivers for ISHTP devices will get an ishtp_cl_device pointer
 * when being probed and shall use it for doing bus I/O.
 */
struct ishtp_cl_device {
	struct device		dev;
	struct ishtp_device	*ishtp_dev;
	struct ishtp_fw_client	*fw_client;
	struct list_head	device_link;
	struct work_struct	event_work;
	void			*driver_data;
	int			reference_count;
	void (*event_cb)(struct ishtp_cl_device *device);
};

/**
 * struct ishtp_cl_device - ISHTP device handle
 * @driver:	driver instance on a bus
 * @name:	Name of the device for probe
 * @probe:	driver callback for device probe
 * @remove:	driver callback on device removal
 *
 * Client drivers defines to get probed/removed for ISHTP client device.
 */
struct ishtp_cl_driver {
	struct device_driver driver;
	const char *name;
	int (*probe)(struct ishtp_cl_device *dev);
	int (*remove)(struct ishtp_cl_device *dev);
	int (*reset)(struct ishtp_cl_device *dev);
	const struct dev_pm_ops *pm;
};


int	ishtp_bus_new_client(struct ishtp_device *dev);
void	ishtp_remove_all_clients(struct ishtp_device *dev);
int	ishtp_cl_device_bind(struct ishtp_cl *cl);
void	ishtp_cl_bus_rx_event(struct ishtp_cl_device *device);

/* Write a multi-fragment message */
int	ishtp_send_msg(struct ishtp_device *dev,
		       struct ishtp_msg_hdr *hdr, void *msg,
		       void (*ipc_send_compl)(void *),
		       void *ipc_send_compl_prm);

/* Write a single-fragment message */
int	ishtp_write_message(struct ishtp_device *dev,
			    struct ishtp_msg_hdr *hdr,
			    unsigned char *buf);

/* Use DMA to send/receive messages */
int ishtp_use_dma_transfer(void);

/* Exported functions */
void	ishtp_bus_remove_all_clients(struct ishtp_device *ishtp_dev,
				     bool warm_reset);

void	ishtp_recv(struct ishtp_device *dev);
void	ishtp_reset_handler(struct ishtp_device *dev);
void	ishtp_reset_compl_handler(struct ishtp_device *dev);

void	ishtp_put_device(struct ishtp_cl_device *);
void	ishtp_get_device(struct ishtp_cl_device *);

void	ishtp_set_drvdata(struct ishtp_cl_device *cl_device, void *data);
void	*ishtp_get_drvdata(struct ishtp_cl_device *cl_device);

int	__ishtp_cl_driver_register(struct ishtp_cl_driver *driver,
				   struct module *owner);
#define ishtp_cl_driver_register(driver)		\
	__ishtp_cl_driver_register(driver, THIS_MODULE)
void	ishtp_cl_driver_unregister(struct ishtp_cl_driver *driver);

int	ishtp_register_event_cb(struct ishtp_cl_device *device,
				void (*read_cb)(struct ishtp_cl_device *));
int	ishtp_fw_cl_by_uuid(struct ishtp_device *dev, const uuid_le *cuuid);
struct	ishtp_fw_client *ishtp_fw_cl_get_client(struct ishtp_device *dev,
						const uuid_le *uuid);

#endif /* _LINUX_ISHTP_CL_BUS_H */