viafb: Introduce viafb_find_i2c_adapter()

The camera driver will need this to look up a specific adapter.

Cc: ScottFang@viatech.com.cn
Cc: JosephChan@via.com.tw
Cc: Harald Welte <laforge@gnumonks.org>
Acked-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/video/via/via_i2c.c b/drivers/video/via/via_i2c.c
index c88450ee62ba..febc1dda69c1 100644
--- a/drivers/video/via/via_i2c.c
+++ b/drivers/video/via/via_i2c.c
@@ -157,6 +157,19 @@ int viafb_i2c_readbytes(u8 adap, u8 slave_addr, u8 index, u8 *buff, int buff_len
         return i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
 }
 
+/*
+ * Allow other viafb subdevices to look up a specific adapter
+ * by port name.
+ */
+struct i2c_adapter *viafb_find_i2c_adapter(enum viafb_i2c_adap which)
+{
+        struct via_i2c_stuff *stuff = &via_i2c_par[which];
+
+        return &stuff->adapter;
+}
+EXPORT_SYMBOL_GPL(viafb_find_i2c_adapter);
+
+
 static int create_i2c_bus(struct i2c_adapter *adapter,
                           struct i2c_algo_bit_data *algo,
                           struct via_port_cfg *adap_cfg,