X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=drivers%2Fmedia%2Fvideo%2Fau0828%2Fau0828-i2c.c;h=d57a38f5c738a57679d8ff2411475159cb2774ce;hb=dc8685b565d6526aca6aaefb80059d115c124821;hp=d618fbaade1bcc3d31828e32d65e7cff310049be;hpb=550ac958791399266c20e15e8048cd12bfce08ae;p=karo-tx-linux.git

diff --git a/drivers/media/video/au0828/au0828-i2c.c b/drivers/media/video/au0828/au0828-i2c.c
index d618fbaade1b..d57a38f5c738 100644
--- a/drivers/media/video/au0828/au0828-i2c.c
+++ b/drivers/media/video/au0828/au0828-i2c.c
@@ -140,13 +140,40 @@ static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
 	dprintk(4, "%s()\n", __func__);
 
 	au0828_write(dev, REG_2FF, 0x01);
-	au0828_write(dev, REG_202, 0x07);
+
+	/* FIXME: There is a problem with i2c communications with xc5000 that
+	   requires us to slow down the i2c clock until we have a better
+	   strategy (such as using the secondary i2c bus to do firmware
+	   loading */
+	if ((msg->addr << 1) == 0xc2) {
+		au0828_write(dev, REG_202, 0x40);
+	} else {
+		au0828_write(dev, REG_202, 0x07);
+	}
 
 	/* Hardware needs 8 bit addresses */
 	au0828_write(dev, REG_203, msg->addr << 1);
 
 	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]);
@@ -191,7 +218,16 @@ static int i2c_readbytes(struct i2c_adapter *i2c_adap,
 	dprintk(4, "%s()\n", __func__);
 
 	au0828_write(dev, REG_2FF, 0x01);
-	au0828_write(dev, REG_202, 0x07);
+
+	/* FIXME: There is a problem with i2c communications with xc5000 that
+	   requires us to slow down the i2c clock until we have a better
+	   strategy (such as using the secondary i2c bus to do firmware
+	   loading */
+	if ((msg->addr << 1) == 0xc2) {
+		au0828_write(dev, REG_202, 0x40);
+	} else {
+		au0828_write(dev, REG_202, 0x07);
+	}
 
 	/* Hardware needs 8 bit addresses */
 	au0828_write(dev, REG_203, msg->addr << 1);