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path: root/drivers/media/video
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-rw-r--r--drivers/media/video/au0828/au0828-i2c.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/media/video/au0828/au0828-i2c.c b/drivers/media/video/au0828/au0828-i2c.c
index ee3e3040d54..d57a38f5c73 100644
--- a/drivers/media/video/au0828/au0828-i2c.c
+++ b/drivers/media/video/au0828/au0828-i2c.c
@@ -156,6 +156,24 @@ static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
dprintk(4, "SEND: %02x\n", msg->addr);
+ /* Deal with i2c_scan */
+ if (msg->len == 0) {
+ /* The analog tuner detection code makes use of the SMBUS_QUICK
+ message (which involves a zero length i2c write). To avoid
+ checking the status register when we didn't strobe out any
+ actual bytes to the bus, just do a read check. This is
+ consistent with how I saw i2c device checking done in the
+ USB trace of the Windows driver */
+ au0828_write(dev, REG_200, 0x20);
+ if (!i2c_wait_done(i2c_adap))
+ return -EIO;
+
+ if (i2c_wait_read_ack(i2c_adap))
+ return -EIO;
+
+ return 0;
+ }
+
for (i = 0; i < msg->len;) {
dprintk(4, " %02x\n", msg->buf[i]);