Add support for I2C read operation without a preceeding write.
While here, change the error code to EOPNOTSUPP in case an
unsupported I2C operation is attempted.
Signed-off-by: Olli Salonen <olli.salo...@iki.fi>
---
drivers/media/usb/dvb-usb-v2/rtl28xxu.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
index 895441f..54cb109 100644
--- a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
+++ b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c
@@ -232,8 +232,14 @@ static int rtl28xxu_i2c_xfer(struct i2c_adapter *adap,
struct i2c_msg msg[],
req.data = msg[0].buf;
ret = rtl28xxu_ctrl_msg(d, &req);
}
+ } else if (num == 1 && (msg[0].flags & I2C_M_RD)) {
+ req.value = (msg[0].addr << 1);
+ req.index = CMD_I2C_DA_RD;
+ req.size = msg[0].len;
+ req.data = msg[0].buf;
+ ret = rtl28xxu_ctrl_msg(d, &req);
} else {
- ret = -EINVAL;
+ ret = -EOPNOTSUPP;
}
err_mutex_unlock:
--
1.9.1
--
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