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_TX  = 2,
  20         GB_CONNECTION_STATE_ENABLED     = 3,
  21 };
  22
  23 struct gb_operation;
  24
  25 typedef int (*gb_request_handler_t)(struct gb_operation *);
  26
  27 struct gb_connection {
  28         struct gb_host_device           *hd;
  29         struct gb_interface             *intf;
  30         struct gb_bundle                *bundle;
  31         struct kref                     kref;
  32         u16                             hd_cport_id;
  33         u16                             intf_cport_id;
  34
  35         struct list_head                hd_links;
  36         struct list_head                bundle_links;
  37
  38         gb_request_handler_t            handler;
  39
  40         struct gb_protocol              *protocol;
  41         u8                              protocol_id;
  42         u8                              module_major;
  43         u8                              module_minor;
  44
  45         struct mutex                    mutex;
  46         spinlock_t                      lock;
  47         enum gb_connection_state        state;
  48         struct list_head                operations;
  49
  50         char                            name[16];
  51         struct workqueue_struct         *wq;
  52
  53         atomic_t                        op_cycle;
  54
  55         void                            *private;
  56 };
  57
  58 struct gb_connection *gb_connection_create_static(struct gb_host_device *hd,
  59                                 u16 hd_cport_id, u8 protocol_id);
  60 struct gb_connection *gb_connection_create_dynamic(struct gb_interface *intf,
  61                                 struct gb_bundle *bundle, u16 cport_id,
  62                                 u8 protocol_id);
  63 void gb_connection_destroy(struct gb_connection *connection);
  64
  65 static inline bool gb_connection_is_static(struct gb_connection *connection)
  66 {
  67         return !connection->intf;
  68 }
  69
  70 int gb_connection_enable(struct gb_connection *connection,
  71                                         gb_request_handler_t handler);
  72 static inline int gb_connection_enable_tx(struct gb_connection *connection)
  73 {
  74         return gb_connection_enable(connection, NULL);
  75 }
  76 void gb_connection_disable_rx(struct gb_connection *connection);
  77 void gb_connection_disable(struct gb_connection *connection);
  78
  79 void greybus_data_rcvd(struct gb_host_device *hd, u16 cport_id,
  80                         u8 *data, size_t length);
  81
  82 void gb_connection_latency_tag_enable(struct gb_connection *connection);
  83 void gb_connection_latency_tag_disable(struct gb_connection *connection);
  84
  85 #endif /* __CONNECTION_H */