Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / video / fbdev / via / via_aux_edid.c

diff --git a/kernel/drivers/video/fbdev/via/via_aux_edid.c b/kernel/drivers/video/fbdev/via/via_aux_edid.c
new file mode 100644 (file)
index 0000000..754d450
--- /dev/null
+++ b/kernel/drivers/video/fbdev/via/via_aux_edid.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation;
+ * either version 2, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even
+ * the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE.See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+/*
+ * generic EDID driver
+ */
+
+#include <linux/slab.h>
+#include <linux/fb.h>
+#include "via_aux.h"
+#include "../edid.h"
+
+
+static const char *name = "EDID";
+
+
+static void query_edid(struct via_aux_drv *drv)
+{
+       struct fb_monspecs *spec = drv->data;
+       unsigned char edid[EDID_LENGTH];
+       bool valid = false;
+
+       if (spec) {
+               fb_destroy_modedb(spec->modedb);
+       } else {
+               spec = kmalloc(sizeof(*spec), GFP_KERNEL);
+               if (!spec)
+                       return;
+       }
+
+       spec->version = spec->revision = 0;
+       if (via_aux_read(drv, 0x00, edid, EDID_LENGTH)) {
+               fb_edid_to_monspecs(edid, spec);
+               valid = spec->version || spec->revision;
+       }
+
+       if (!valid) {
+               kfree(spec);
+               spec = NULL;
+       } else
+               printk(KERN_DEBUG "EDID: %s %s\n", spec->manufacturer, spec->monitor);
+
+       drv->data = spec;
+}
+
+static const struct fb_videomode *get_preferred_mode(struct via_aux_drv *drv)
+{
+       struct fb_monspecs *spec = drv->data;
+       int i;
+
+       if (!spec || !spec->modedb || !(spec->misc & FB_MISC_1ST_DETAIL))
+               return NULL;
+
+       for (i = 0; i < spec->modedb_len; i++) {
+               if (spec->modedb[i].flag & FB_MODE_IS_FIRST &&
+                       spec->modedb[i].flag & FB_MODE_IS_DETAILED)
+                       return &spec->modedb[i];
+       }
+
+       return NULL;
+}
+
+static void cleanup(struct via_aux_drv *drv)
+{
+       struct fb_monspecs *spec = drv->data;
+
+       if (spec)
+               fb_destroy_modedb(spec->modedb);
+}
+
+void via_aux_edid_probe(struct via_aux_bus *bus)
+{
+       struct via_aux_drv drv = {
+               .bus    =       bus,
+               .addr   =       0x50,
+               .name   =       name,
+               .cleanup        =       cleanup,
+               .get_preferred_mode     =       get_preferred_mode};
+
+       query_edid(&drv);
+
+       /* as EDID devices can be connected/disconnected just add the driver */
+       via_aux_add(&drv);
+}