upstream: [media] af9035: implement I2C adapter read operation

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/usb/dvb-usb-v2/af9035.c b/drivers/media/usb/dvb-usb-v2/af9035.c
index 2e93ba5..107e5d8 100644 (file)
--- a/drivers/media/usb/dvb-usb-v2/af9035.c
+++ b/drivers/media/usb/dvb-usb-v2/af9035.c
@@ -293,11 +293,29 @@ static int af9035_i2c_master_xfer(struct i2c_adapter *adap,
                        memcpy(&buf[5], msg[0].buf, msg[0].len);
                        ret = af9035_ctrl_msg(d, &req);
                }
+       } else if (num == 1 && (msg[0].flags & I2C_M_RD)) {
+               if (msg[0].len > 40) {
+                       /* TODO: correct limits > 40 */
+                       ret = -EOPNOTSUPP;
+               } else {
+                       /* I2C */
+                       u8 buf[5];
+                       struct usb_req req = { CMD_I2C_RD, 0, sizeof(buf),
+                                       buf, msg[0].len, msg[0].buf };
+                       req.mbox |= ((msg[0].addr & 0x80)  >>  3);
+                       buf[0] = msg[0].len;
+                       buf[1] = msg[0].addr << 1;
+                       buf[2] = 0x00; /* reg addr len */
+                       buf[3] = 0x00; /* reg addr MSB */
+                       buf[4] = 0x00; /* reg addr LSB */
+                       ret = af9035_ctrl_msg(d, &req);
+               }
        } else {
                /*
-                * We support only two kind of I2C transactions:
-                * 1) 1 x read + 1 x write
+                * We support only three kind of I2C transactions:
+                * 1) 1 x read + 1 x write (repeated start)
                 * 2) 1 x write
+                * 3) 1 x read
                 */
                ret = -EOPNOTSUPP;
        }