drivers/staging/greybus/connection.h

   1 /*
   2  * Greybus connections
   3  *
   4  * Copyright 2014 Google Inc.
   5  *
   6  * Released under the GPLv2 only.
   7  */
   8
   9 #ifndef __CONNECTION_H
  10 #define __CONNECTION_H
  11
  12 #include <linux/list.h>
  13
  14 #include "greybus.h"
  15
  16 enum gb_connection_state {
  17         GB_CONNECTION_STATE_INVALID     = 0,
  18         GB_CONNECTION_STATE_DISABLED    = 1,
  19         GB_CONNECTION_STATE_ENABLED     = 2,
  20         GB_CONNECTION_STATE_ERROR       = 3,
  21         GB_CONNECTION_STATE_DESTROYING  = 4,
  22 };
  23
  24 struct gb_connection;
  25 typedef int (*gb_connection_init_t)(struct gb_connection *);
  26 typedef void (*gb_connection_exit_t)(struct gb_connection *);
  27
  28 struct gb_connection_handler {
  29         gb_connection_init_t    connection_init;
  30         gb_connection_exit_t    connection_exit;
  31 };
  32
  33 struct gb_connection {
  34         struct greybus_host_device      *hd;
  35         struct gb_interface             *interface;
  36         struct device                   dev;
  37         u16                             hd_cport_id;
  38         u16                             interface_cport_id;
  39
  40         struct rb_node                  hd_node;
  41         struct list_head                interface_links;
  42         u8                              protocol_id;
  43
  44         enum gb_connection_state        state;
  45
  46         struct list_head                operations;
  47         struct rb_root                  pending;        /* awaiting reponse */
  48         atomic_t                        op_cycle;
  49
  50         struct gb_connection_handler    *handler;
  51
  52         void                            *private;
  53 };
  54 #define to_gb_connection(d) container_of(d, struct gb_connection, dev)
  55
  56 struct gb_connection *gb_connection_create(struct gb_interface *interface,
  57                                 u16 cport_id, u8 protocol_id);
  58 void gb_connection_destroy(struct gb_connection *connection);
  59
  60 int gb_connection_init(struct gb_connection *connection);
  61 void gb_connection_exit(struct gb_connection *connection);
  62
  63 struct gb_connection *gb_hd_connection_find(struct greybus_host_device *hd,
  64                                 u16 cport_id);
  65
  66 u16 gb_connection_operation_id(struct gb_connection *connection);
  67
  68 __printf(2, 3)
  69 void gb_connection_err(struct gb_connection *connection, const char *fmt, ...);
  70
  71 #endif /* __CONNECTION_H */