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With the introduced read fixes, version information can be extracted
from the indexed gmux device.

> apple_gmux: Found gmux version 3.2.19 [indexed]
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Signed-off-by: Bernhard Froemel <[email protected]>
--- a/drivers/platform/x86/apple-gmux.c 2012-08-22 22:29:06.000000000 +0200
+++ b/drivers/platform/x86/apple-gmux.c 2012-08-24 09:18:50.229362622 +0200
@@ -461,18 +461,22 @@
        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;

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