greybus: define GB_OP_NONEXISTENT

The i2c protocol needs a way to indicate an i2c device doesn't exist
(which is not necessarily an error).  Define GB_OP_NONEXISTENT to
indicate this, and updating the status<->errno mapping functions
accordingly.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

diff --git a/drivers/staging/greybus/operation.c b/drivers/staging/greybus/operation.c
index 046ed2a..742eccc 100644 (file)
--- a/drivers/staging/greybus/operation.c
+++ b/drivers/staging/greybus/operation.c
@@ -396,6 +396,8 @@ static int gb_operation_status_map(u8 status)
                return -EINVAL;
        case GB_OP_RETRY:
                return -EAGAIN;
+       case GB_OP_NONEXISTENT:
+               return -ENODEV;
        case GB_OP_MALFUNCTION:
                return -EILSEQ;
        case GB_OP_UNKNOWN_ERROR:
@@ -431,6 +433,8 @@ static u8 gb_operation_errno_map(int errno)
                return GB_OP_RETRY;
        case -EILSEQ:
                return GB_OP_MALFUNCTION;
+       case -ENODEV:
+               return GB_OP_NONEXISTENT;
        case -EIO:
        default:
                return GB_OP_UNKNOWN_ERROR;

diff --git a/drivers/staging/greybus/operation.h b/drivers/staging/greybus/operation.h
index a173aa9..1ade52b 100644 (file)
--- a/drivers/staging/greybus/operation.h
+++ b/drivers/staging/greybus/operation.h
@@ -34,6 +34,7 @@ enum gb_operation_result {
        GB_OP_OVERFLOW          = 0x05,
        GB_OP_INVALID           = 0x06,
        GB_OP_RETRY             = 0x07,
+       GB_OP_NONEXISTENT       = 0x08,
        GB_OP_UNKNOWN_ERROR     = 0xfe,
        GB_OP_MALFUNCTION       = 0xff,
 };