viafb: add auxiliary device management infrastructure

This patch adds the basic infrastructure and a few stub drivers for
devices that are connected via I2C busses. The infrastructure will
be used to replace and extend the support that is scattered
throughout viafb. The stub drivers are not very useful yet but they
show how the infrastructure works, provide information about the
chips integrated into a system and maybe gather some testers as it
would be very difficult for a single person to get a sane test
environment.
The only thing this actually does is probing the I2C busses which
will hopefully not cause any regressions.

Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

1 files changed, 50 insertions, 0 deletions

diff --git a/drivers/video/via/via_aux_ch7301.c b/drivers/video/via/via_aux_ch7301.c
new file mode 100644
index 000000000000..1cbe5037a6b0
--- /dev/null
+++ b/drivers/video/via/via_aux_ch7301.c
@@ -0,0 +1,50 @@
+/*
+ * 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.
+ */
+/*
+ * driver for Chrontel CH7301 DVI Transmitter
+ */
+
+#include <linux/slab.h>
+#include "via_aux.h"
+
+
+static const char *name = "CH7301 DVI Transmitter";
+
+
+static void probe(struct via_aux_bus *bus, u8 addr)
+{
+	struct via_aux_drv drv = {
+		.bus	=	bus,
+		.addr	=	addr,
+		.name	=	name};
+	u8 tmp;
+
+	if (!via_aux_read(&drv, 0x4B, &tmp, 1) || tmp != 0x17)
+		return;
+
+	printk(KERN_INFO "viafb: Found %s at address 0x%x\n", name, addr);
+	via_aux_add(&drv);
+}
+
+void via_aux_ch7301_probe(struct via_aux_bus *bus)
+{
+	probe(bus, 0x75);
+	probe(bus, 0x76);
+}