greybus: svc: support status in svc_intf_activate response

Update per Greybus spec. Status attribute added to activate
response to return more detailed information about errors during
activate. If the Greybus response is GB_OP_SUCCESS, the caller
must also check the status attribute in the response to determine
if any other errors occurred.

Testing done: along with matchine firmware change, verified that modules
              were detected and enumerated as expected.

Signed-off-by: Jeffrey Carlyle <jcarlyle@google.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>

diff --git a/drivers/staging/greybus/greybus_protocols.h b/drivers/staging/greybus/greybus_protocols.h
index c77fb25..ca5eb3b 100644 (file)
--- a/drivers/staging/greybus/greybus_protocols.h
+++ b/drivers/staging/greybus/greybus_protocols.h
@@ -849,6 +849,24 @@ struct gb_spi_transfer_response {
 #define GB_SVC_TYPE_INTF_ACTIVATE              0x27
 #define GB_SVC_TYPE_INTF_MAILBOX_EVENT         0x29
 
+/* Greybus SVC protocol status values */
+#define GB_SVC_OP_SUCCESS                      0x00
+#define GB_SVC_OP_UNKNOWN_ERROR                        0x01
+#define GB_SVC_INTF_NOT_DETECTED               0x02
+#define GB_SVC_INTF_NO_UPRO_LINK               0x03
+#define GB_SVC_INTF_UPRO_NOT_DOWN              0x04
+#define GB_SVC_INTF_UPRO_NOT_HIBERNATED                0x05
+#define GB_SVC_INTF_NO_V_SYS                   0x06
+#define GB_SVC_INTF_V_CHG                      0x07
+#define GB_SVC_INTF_WAKE_BUSY                  0x08
+#define GB_SVC_INTF_NO_REFCLK                  0x09
+#define GB_SVC_INTF_RELEASING                  0x0a
+#define GB_SVC_INTF_NO_ORDER                   0x0b
+#define GB_SVC_INTF_MBOX_SET                   0x0c
+#define GB_SVC_INTF_BAD_MBOX                   0x0d
+#define GB_SVC_INTF_OP_TIMEOUT                 0x0e
+#define GB_SVC_PWRMON_OP_NOT_PRESENT           0x0f
+
 struct gb_svc_version_request {
        __u8    major;
        __u8    minor;
@@ -1133,6 +1151,7 @@ struct gb_svc_intf_activate_request {
 #define GB_SVC_INTF_TYPE_GREYBUS               0x03
 
 struct gb_svc_intf_activate_response {
+       __u8    status;
        __u8    intf_type;
 } __packed;
 

diff --git a/drivers/staging/greybus/svc.c b/drivers/staging/greybus/svc.c
index a98593c..3bdf778 100644 (file)
--- a/drivers/staging/greybus/svc.c
+++ b/drivers/staging/greybus/svc.c
@@ -340,6 +340,11 @@ int gb_svc_intf_activate(struct gb_svc *svc, u8 intf_id, u8 *intf_type)
                        SVC_INTF_ACTIVATE_TIMEOUT);
        if (ret < 0)
                return ret;
+       if (response.status != GB_SVC_OP_SUCCESS) {
+               dev_err(&svc->dev, "failed to activate interface %u: %u\n",
+                               intf_id, response.status);
+               return -EREMOTEIO;
+       }
 
        *intf_type = response.intf_type;