greybus: svc: add a "watchdog" to check the network health

Now that we have a svc ping command, let's add a watchdog to call it
every so often (1 second at the moment.)  If it finds something went
wrong, post a stern message to the kernel log and call:
	start unipro_reset
to reset the whole greybus hardware subsystem.

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Reviewed-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/staging/greybus/svc.h b/drivers/staging/greybus/svc.h
index f3e8479b9438..0f81e97a2e88 100644
--- a/drivers/staging/greybus/svc.h
+++ b/drivers/staging/greybus/svc.h
@@ -16,6 +16,8 @@ enum gb_svc_state {
 	GB_SVC_STATE_SVC_HELLO,
 };
 
+struct gb_svc_watchdog;
+
 struct gb_svc {
 	struct device		dev;
 
@@ -33,6 +35,7 @@ struct gb_svc {
 
 	struct input_dev        *input;
 	char                    *input_phys;
+	struct gb_svc_watchdog	*watchdog;
 };
 #define to_gb_svc(d) container_of(d, struct gb_svc, d)
 
@@ -56,6 +59,8 @@ int gb_svc_intf_set_power_mode(struct gb_svc *svc, u8 intf_id, u8 hs_series,
 			       u8 rx_mode, u8 rx_gear, u8 rx_nlanes,
 			       u8 flags, u32 quirks);
 int gb_svc_ping(struct gb_svc *svc);
+int gb_svc_watchdog_create(struct gb_svc *svc);
+void gb_svc_watchdog_destroy(struct gb_svc *svc);
 
 int gb_svc_protocol_init(void);
 void gb_svc_protocol_exit(void);