V4L/DVB: ov7670: Restore SMBUS I/O for the XO 1.0

The Cafe controller doesn't do non-SMBUS I/O, so we have to use it there.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/drivers/media/video/ov7670.c b/drivers/media/video/ov7670.c
index 90c44598dd51..21243303755f 100644
--- a/drivers/media/video/ov7670.c
+++ b/drivers/media/video/ov7670.c
@@ -409,6 +409,42 @@ static struct regval_list ov7670_fmt_raw[] = {
 
 /*
  * Low-level register I/O.
+ *
+ * Note that there are two versions of these.  On the XO 1, the
+ * i2c controller only does SMBUS, so that's what we use.  The
+ * ov7670 is not really an SMBUS device, though, so the communication
+ * is not always entirely reliable.
+ */
+#ifdef CONFIG_OLPC_XO_1
+static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
+                unsigned char *value)
+{
+        struct i2c_client *client = v4l2_get_subdevdata(sd);
+        int ret;
+
+        ret = i2c_smbus_read_byte_data(client, reg);
+        if (ret >= 0) {
+                *value = (unsigned char)ret;
+                ret = 0;
+        }
+        return ret;
+}
+
+
+static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
+                unsigned char value)
+{
+        struct i2c_client *client = v4l2_get_subdevdata(sd);
+        int ret = i2c_smbus_write_byte_data(client, reg, value);
+
+        if (reg == REG_COM7 && (value & COM7_RESET))
+                msleep(5);  /* Wait for reset to run */
+        return ret;
+}
+
+#else /* ! CONFIG_OLPC_XO_1 */
+/*
+ * On most platforms, we'd rather do straight i2c I/O.
  */
 static int ov7670_read(struct v4l2_subdev *sd, unsigned char reg,
                 unsigned char *value)
@@ -462,6 +498,7 @@ static int ov7670_write(struct v4l2_subdev *sd, unsigned char reg,
                 msleep(5);  /* Wait for reset to run */
         return ret;
 }
+#endif /* CONFIG_OLPC_XO_1 */
 
 
 /*