Quelle  connection.h   Sprache: C

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Greybus connections
 *
 * Copyright 2014 Google Inc.
 * Copyright 2014 Linaro Ltd.
 */

#ifndef __CONNECTION_H
#define __CONNECTION_H

#include <linux/bits.h>
#include <linux/list.h>
#include <linux/kfifo.h>
#include <linux/kref.h>
#include <linux/workqueue.h>

#define GB_CONNECTION_FLAG_CSD  BIT(0)
#define GB_CONNECTION_FLAG_NO_FLOWCTRL BIT(1)
#define GB_CONNECTION_FLAG_OFFLOADED BIT(2)
#define GB_CONNECTION_FLAG_CDSI1 BIT(3)
#define GB_CONNECTION_FLAG_CONTROL BIT(4)
#define GB_CONNECTION_FLAG_HIGH_PRIO BIT(5)

#define GB_CONNECTION_FLAG_CORE_MASK GB_CONNECTION_FLAG_CONTROL

enum gb_connection_state {
 GB_CONNECTION_STATE_DISABLED  = 0,
 GB_CONNECTION_STATE_ENABLED_TX  = 1,
 GB_CONNECTION_STATE_ENABLED  = 2,
 GB_CONNECTION_STATE_DISCONNECTING = 3,
};

struct gb_operation;

typedef int (*gb_request_handler_t)(struct gb_operation *);

struct gb_connection {
 struct gb_host_device  *hd;
 struct gb_interface  *intf;
 struct gb_bundle  *bundle;
 struct kref   kref;
 u16    hd_cport_id;
 u16    intf_cport_id;

 struct list_head  hd_links;
 struct list_head  bundle_links;

 gb_request_handler_t  handler;
 unsigned long   flags;

 struct mutex   mutex;
 spinlock_t   lock;
 enum gb_connection_state state;
 struct list_head  operations;

 char    name[16];
 struct workqueue_struct  *wq;

 atomic_t   op_cycle;

 void    *private;

 bool    mode_switch;
};

struct gb_connection *gb_connection_create_static(struct gb_host_device *hd,
    u16 hd_cport_id, gb_request_handler_t handler);
struct gb_connection *gb_connection_create_control(struct gb_interface *intf);
struct gb_connection *gb_connection_create(struct gb_bundle *bundle,
    u16 cport_id, gb_request_handler_t handler);
struct gb_connection *gb_connection_create_flags(struct gb_bundle *bundle,
    u16 cport_id, gb_request_handler_t handler,
    unsigned long flags);
struct gb_connection *gb_connection_create_offloaded(struct gb_bundle *bundle,
    u16 cport_id, unsigned long flags);
void gb_connection_destroy(struct gb_connection *connection);

static inline bool gb_connection_is_static(struct gb_connection *connection)
{
 return !connection->intf;
}

int gb_connection_enable(struct gb_connection *connection);
int gb_connection_enable_tx(struct gb_connection *connection);
void gb_connection_disable_rx(struct gb_connection *connection);
void gb_connection_disable(struct gb_connection *connection);
void gb_connection_disable_forced(struct gb_connection *connection);

void gb_connection_mode_switch_prepare(struct gb_connection *connection);
void gb_connection_mode_switch_complete(struct gb_connection *connection);

void greybus_data_rcvd(struct gb_host_device *hd, u16 cport_id,
         u8 *data, size_t length);

void gb_connection_latency_tag_enable(struct gb_connection *connection);
void gb_connection_latency_tag_disable(struct gb_connection *connection);

static inline bool gb_connection_e2efc_enabled(struct gb_connection *connection)
{
 return !(connection->flags & GB_CONNECTION_FLAG_CSD);
}

static inline bool
gb_connection_flow_control_disabled(struct gb_connection *connection)
{
 return connection->flags & GB_CONNECTION_FLAG_NO_FLOWCTRL;
}

static inline bool gb_connection_is_offloaded(struct gb_connection *connection)
{
 return connection->flags & GB_CONNECTION_FLAG_OFFLOADED;
}

static inline bool gb_connection_is_control(struct gb_connection *connection)
{
 return connection->flags & GB_CONNECTION_FLAG_CONTROL;
}

static inline void *gb_connection_get_data(struct gb_connection *connection)
{
 return connection->private;
}

static inline void gb_connection_set_data(struct gb_connection *connection,
       void *data)
{
 connection->private = data;
}

#endif /* __CONNECTION_H */