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[media] rtl28xxu: add I2C read without write 

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.salonen@iki.fi>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Olli Salonen 2015-05-05 13:54:18 -03:00 committed by Mauro Carvalho Chehab
parent ee3c3e4688
commit d744a0cb8a
1 changed files with 7 additions and 1 deletions
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8
drivers/media/usb/dvb-usb-v2/rtl28xxu.c
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@ -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: