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path: root/drivers/video/fbdev/via/via_aux_edid.c
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Diffstat (limited to 'drivers/video/fbdev/via/via_aux_edid.c')
-rw-r--r--drivers/video/fbdev/via/via_aux_edid.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/drivers/video/fbdev/via/via_aux_edid.c b/drivers/video/fbdev/via/via_aux_edid.c
new file mode 100644
index 000000000000..754d4509033f
--- /dev/null
+++ b/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);
+}