xref: /openbmc/linux/include/linux/greybus.h (revision ec0ad868)

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Greybus driver and device API
 *
 * Copyright 2014-2015 Google Inc.
 * Copyright 2014-2015 Linaro Ltd.
 */

#ifndef __LINUX_GREYBUS_H
#define __LINUX_GREYBUS_H

#ifdef __KERNEL__

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/idr.h>

#include <linux/greybus/greybus_id.h>
#include <linux/greybus/greybus_manifest.h>
#include <linux/greybus/greybus_protocols.h>
#include <linux/greybus/manifest.h>
#include <linux/greybus/hd.h>
#include <linux/greybus/svc.h>
#include <linux/greybus/control.h>
#include <linux/greybus/module.h>
#include <linux/greybus/interface.h>
#include <linux/greybus/bundle.h>
#include <linux/greybus/connection.h>
#include <linux/greybus/operation.h>

/* Matches up with the Greybus Protocol specification document */
#define GREYBUS_VERSION_MAJOR	0x00
#define GREYBUS_VERSION_MINOR	0x01

#define GREYBUS_ID_MATCH_DEVICE \
	(GREYBUS_ID_MATCH_VENDOR | GREYBUS_ID_MATCH_PRODUCT)

#define GREYBUS_DEVICE(v, p)					\
	.match_flags	= GREYBUS_ID_MATCH_DEVICE,		\
	.vendor		= (v),					\
	.product	= (p),

#define GREYBUS_DEVICE_CLASS(c)					\
	.match_flags	= GREYBUS_ID_MATCH_CLASS,		\
	.class		= (c),

/* Maximum number of CPorts */
#define CPORT_ID_MAX	4095		/* UniPro max id is 4095 */
#define CPORT_ID_BAD	U16_MAX

struct greybus_driver {
	const char *name;

	int (*probe)(struct gb_bundle *bundle,
		     const struct greybus_bundle_id *id);
	void (*disconnect)(struct gb_bundle *bundle);

	const struct greybus_bundle_id *id_table;

	struct device_driver driver;
};
#define to_greybus_driver(d) container_of(d, struct greybus_driver, driver)

static inline void greybus_set_drvdata(struct gb_bundle *bundle, void *data)
{
	dev_set_drvdata(&bundle->dev, data);
}

static inline void *greybus_get_drvdata(struct gb_bundle *bundle)
{
	return dev_get_drvdata(&bundle->dev);
}

/* Don't call these directly, use the module_greybus_driver() macro instead */
int greybus_register_driver(struct greybus_driver *driver,
			    struct module *module, const char *mod_name);
void greybus_deregister_driver(struct greybus_driver *driver);

/* define to get proper THIS_MODULE and KBUILD_MODNAME values */
#define greybus_register(driver) \
	greybus_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
#define greybus_deregister(driver) \
	greybus_deregister_driver(driver)

/**
 * module_greybus_driver() - Helper macro for registering a Greybus driver
 * @__greybus_driver: greybus_driver structure
 *
 * Helper macro for Greybus drivers to set up proper module init / exit
 * functions.  Replaces module_init() and module_exit() and keeps people from
 * printing pointless things to the kernel log when their driver is loaded.
 */
#define module_greybus_driver(__greybus_driver)	\
	module_driver(__greybus_driver, greybus_register, greybus_deregister)

int greybus_disabled(void);

void gb_debugfs_init(void);
void gb_debugfs_cleanup(void);
struct dentry *gb_debugfs_get(void);

extern struct bus_type greybus_bus_type;

extern struct device_type greybus_hd_type;
extern struct device_type greybus_module_type;
extern struct device_type greybus_interface_type;
extern struct device_type greybus_control_type;
extern struct device_type greybus_bundle_type;
extern struct device_type greybus_svc_type;

static inline int is_gb_host_device(const struct device *dev)
{
	return dev->type == &greybus_hd_type;
}

static inline int is_gb_module(const struct device *dev)
{
	return dev->type == &greybus_module_type;
}

static inline int is_gb_interface(const struct device *dev)
{
	return dev->type == &greybus_interface_type;
}

static inline int is_gb_control(const struct device *dev)
{
	return dev->type == &greybus_control_type;
}

static inline int is_gb_bundle(const struct device *dev)
{
	return dev->type == &greybus_bundle_type;
}

static inline int is_gb_svc(const struct device *dev)
{
	return dev->type == &greybus_svc_type;
}

static inline bool cport_id_valid(struct gb_host_device *hd, u16 cport_id)
{
	return cport_id != CPORT_ID_BAD && cport_id < hd->num_cports;
}

#endif /* __KERNEL__ */
#endif /* __LINUX_GREYBUS_H */