From: Chris Pascoe <c.pascoe@itee.uq.edu.au>
Date: Mon, 19 Nov 2007 06:01:22 +0000 (-0300)
Subject: V4L/DVB (6626): CXUSB: support only-read i2c requests
X-Git-Tag: firefly_0821_release~23728^2~346
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=272479d7ab067344d118e7633b624bf98f8896f3;p=firefly-linux-kernel-4.4.55.git

V4L/DVB (6626): CXUSB: support only-read i2c requests

Any i2c read request that was not immediately preceded by a write request was
incorrectly taking the write path.  Add the capability to handle individual
read requests.

Signed-off-by: Chris Pascoe <c.pascoe@itee.uq.edu.au>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
---

diff --git a/drivers/media/dvb/dvb-usb/cxusb.c b/drivers/media/dvb/dvb-usb/cxusb.c
index 86fbd6c73ea9..016a3780b714 100644
--- a/drivers/media/dvb/dvb-usb/cxusb.c
+++ b/drivers/media/dvb/dvb-usb/cxusb.c
@@ -98,8 +98,21 @@ static int cxusb_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[],
 				break;
 			}
 
-		/* read request */
-		if (i+1 < num && (msg[i+1].flags & I2C_M_RD)) {
+		if (msg[i].flags & I2C_M_RD) {
+			/* read only */
+			u8 obuf[3], ibuf[1+msg[i].len];
+			obuf[0] = 0;
+			obuf[1] = msg[i].len;
+			obuf[2] = msg[i].addr;
+			if (cxusb_ctrl_msg(d, CMD_I2C_READ,
+					   obuf, 3,
+					   ibuf, 1+msg[i].len) < 0) {
+				warn("i2c read failed");
+				break;
+			}
+			memcpy(msg[i].buf, &ibuf[1], msg[i].len);
+		} else if (i+1 < num && (msg[i+1].flags & I2C_M_RD)) {
+			/* write then read */
 			u8 obuf[3+msg[i].len], ibuf[1+msg[i+1].len];
 			obuf[0] = msg[i].len;
 			obuf[1] = msg[i+1].len;
@@ -117,7 +130,8 @@ static int cxusb_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[],
 			memcpy(msg[i+1].buf, &ibuf[1], msg[i+1].len);
 
 			i++;
-		} else { /* write */
+		} else {
+			/* write only */
 			u8 obuf[2+msg[i].len], ibuf;
 			obuf[0] = msg[i].addr;
 			obuf[1] = msg[i].len;