int gb_connection_bind_protocol(struct gb_connection *connection)
{
struct gb_protocol *protocol;
int ret;
/* If we already have a protocol bound here, just return */
if (connection->protocol)
return 0;
protocol = gb_protocol_get(connection->protocol_id,
connection->major,
connection->minor);
if (!protocol)
return 0;
connection->protocol = protocol;
/*
* If we have a valid device_id for the interface block, then we have an
* active device, so bring up the connection at the same time.
*/
if ((!connection->bundle &&
protocol->flags & GB_PROTOCOL_NO_BUNDLE) ||
connection->bundle->intf->device_id != GB_DEVICE_ID_BAD) {
ret = gb_connection_init(connection);
if (ret) {
gb_protocol_put(protocol);
connection->protocol = NULL;
return ret;
}
}
return 0;
}
static int legacy_connection_create(struct legacy_connection *lc,
struct gb_bundle *bundle,
struct greybus_descriptor_cport *desc)
{
struct gb_connection *connection;
struct gb_protocol *protocol;
gb_request_handler_t handler;
u8 major, minor;
int ret;
/*
* The legacy protocols have always been looked up using a hard-coded
* version of 0.1, despite (or perhaps rather, due to) the fact that
* module version negotiation could not take place until after the
* protocol was bound.
*/
major = 0;
minor = 1;
protocol = gb_protocol_get(desc->protocol_id, major, minor);
if (!protocol) {
dev_err(&bundle->dev,
"protocol 0x%02x version %u.%u not found\n",
desc->protocol_id, major, minor);
return -EPROTONOSUPPORT;
}
if (protocol->request_recv)
handler = legacy_request_handler;
else
handler = NULL;
connection = gb_connection_create(bundle, le16_to_cpu(desc->id),
handler);
if (IS_ERR(connection)) {
ret = PTR_ERR(connection);
goto err_protocol_put;
}
/*
* NOTE: We need to keep a pointer to the protocol in the actual
* connection structure for now.
*/
connection->protocol = protocol;
lc->connection = connection;
lc->protocol = protocol;
return 0;
err_protocol_put:
gb_protocol_put(protocol);
return ret;
}