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greybus: connection: add per-connection request handlers 

Add a connection request-handler field to struct gb_connection that is
set when the connection is enabled.

This is a step towards removing the legacy protocol abstraction from
core, and will also be used to implement unidirectional connection
states (e.g. only outgoing operations are allowed).

Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Johan Hovold 2016-01-19 12:51:02 +01:00 committed by Greg Kroah-Hartman
parent 1cbfab3804
commit bfa9a5e2d0
3 changed files with 27 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/staging/greybus/connection.c
View File

@ -387,7 +387,8 @@ static int gb_connection_protocol_get_version(struct gb_connection *connection)
return 0;
}
int gb_connection_enable(struct gb_connection *connection)
int gb_connection_enable(struct gb_connection *connection,
gb_request_handler_t handler)
{
int ret;
@ -400,6 +401,7 @@ int gb_connection_enable(struct gb_connection *connection)
goto err_hd_cport_disable;
spin_lock_irq(&connection->lock);
connection->handler = handler;
connection->state = GB_CONNECTION_STATE_ENABLED;
spin_unlock_irq(&connection->lock);
@ -435,15 +437,28 @@ void gb_connection_disable(struct gb_connection *connection)
}
EXPORT_SYMBOL_GPL(gb_connection_disable);
static int gb_legacy_request_handler(struct gb_operation *operation)
{
struct gb_protocol *protocol = operation->connection->protocol;
return protocol->request_recv(operation->type, operation);
}
int gb_connection_legacy_init(struct gb_connection *connection)
{
gb_request_handler_t handler;
int ret;
ret = gb_connection_bind_protocol(connection);
if (ret)
return ret;
ret = gb_connection_enable(connection);
if (connection->protocol->request_recv)
handler = gb_legacy_request_handler;
else
handler = NULL;
ret = gb_connection_enable(connection, handler);
if (ret)
goto err_unbind_protocol;

9
drivers/staging/greybus/connection.h
View File

@ -20,6 +20,10 @@ enum gb_connection_state {
GB_CONNECTION_STATE_DESTROYING = 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;
@ -31,6 +35,8 @@ struct gb_connection {
struct list_head hd_links;
struct list_head bundle_links;
gb_request_handler_t handler;
struct gb_protocol *protocol;
u8 protocol_id;
u8 major;
@ -62,7 +68,8 @@ 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(struct gb_connection *connection,
gb_request_handler_t handler);
void gb_connection_disable(struct gb_connection *connection);
int gb_connection_legacy_init(struct gb_connection *connection);

8
drivers/staging/greybus/operation.c
View File

@ -218,15 +218,11 @@ static void gb_message_cancel(struct gb_message *message)
static void gb_operation_request_handle(struct gb_operation *operation)
{
struct gb_connection *connection = operation->connection;
struct gb_protocol *protocol = connection->protocol;
int status;
int ret;
if (!protocol)
return;
if (protocol->request_recv) {
status = protocol->request_recv(operation->type, operation);
if (connection->handler) {
status = connection->handler(operation);
} else {
dev_err(&connection->hd->dev,
"%s: unexpected incoming request of type 0x%02x\n",