apple-gmux: Obtain version info from indexed gmux

This patch extracts and displays version information from the indexed
gmux device as it is also done for the classic gmux device.

Signed-off-by: Bernhard Froemel <froemel@vmars.tuwien.ac.at>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

1 files changed, 8 insertions, 4 deletions

diff --git a/drivers/platform/x86/apple-gmux.c b/drivers/platform/x86/apple-gmux.c
index dfb1a92ce949..c9558d1ea88c 100644
--- a/drivers/platform/x86/apple-gmux.c
+++ b/drivers/platform/x86/apple-gmux.c
@@ -461,18 +461,22 @@ static int __devinit gmux_probe(struct pnp_dev *pnp,
         ver_release = gmux_read8(gmux_data, GMUX_PORT_VERSION_RELEASE);
         if (ver_major == 0xff && ver_minor == 0xff && ver_release == 0xff) {
                 if (gmux_is_indexed(gmux_data)) {
+                        u32 version;
                         mutex_init(&gmux_data->index_lock);
                         gmux_data->indexed = true;
+                        version = gmux_read32(gmux_data,
+                                GMUX_PORT_VERSION_MAJOR);
+                        ver_major = (version >> 24) & 0xff;
+                        ver_minor = (version >> 16) & 0xff;
+                        ver_release = (version >> 8) & 0xff;
                 } else {
                         pr_info("gmux device not present\n");
                         ret = -ENODEV;
                         goto err_release;
                 }
-                pr_info("Found indexed gmux\n");
-        } else {
-                pr_info("Found gmux version %d.%d.%d\n", ver_major, ver_minor,
-                        ver_release);
         }
+        pr_info("Found gmux version %d.%d.%d [%s]\n", ver_major, ver_minor,
+                ver_release, (gmux_data->indexed ? "indexed" : "classic"));
 
         memset(&props, 0, sizeof(props));
         props.type = BACKLIGHT_PLATFORM;