drivers/staging/greybus/connection.h

   1 /*
   2  * Greybus connections
   3  *
   4  * Copyright 2014 Google Inc.
   5  * Copyright 2014 Linaro Ltd.
   6  *
   7  * Released under the GPLv2 only.
   8  */
   9
  10 #ifndef __CONNECTION_H
  11 #define __CONNECTION_H
  12
  13 #include <linux/list.h>
  14 #include <linux/kfifo.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         struct gb_host_device           *hd;
  26         struct gb_bundle                *bundle;
  27         struct kref                     kref;
  28         u16                             hd_cport_id;
  29         u16                             intf_cport_id;
  30
  31         struct list_head                hd_links;
  32         struct list_head                bundle_links;
  33
  34         struct gb_protocol              *protocol;
  35         u8                              protocol_id;
  36         u8                              major;
  37         u8                              minor;
  38         u8                              module_major;
  39         u8                              module_minor;
  40
  41         spinlock_t                      lock;
  42         enum gb_connection_state        state;
  43         struct list_head                operations;
  44
  45         struct workqueue_struct         *wq;
  46
  47         atomic_t                        op_cycle;
  48
  49         void                            *private;
  50 };
  51
  52 int svc_update_connection(struct gb_interface *intf,
  53                           struct gb_connection *connection);
  54 struct gb_connection *gb_connection_create(struct gb_bundle *bundle,
  55                                 u16 cport_id, u8 protocol_id);
  56 struct gb_connection *gb_connection_create_range(struct gb_host_device *hd,
  57                            struct gb_bundle *bundle, struct device *parent,
  58                            u16 cport_id, u8 protocol_id, u32 ida_start,
  59                            u32 ida_end);
  60 void gb_connection_destroy(struct gb_connection *connection);
  61
  62 void greybus_data_rcvd(struct gb_host_device *hd, u16 cport_id,
  63                         u8 *data, size_t length);
  64
  65 int gb_connection_bind_protocol(struct gb_connection *connection);
  66
  67 void gb_connection_latency_tag_enable(struct gb_connection *connection);
  68 void gb_connection_latency_tag_disable(struct gb_connection *connection);
  69
  70 #endif /* __CONNECTION_H */