From d744a0cb8a819e93ad3852705a8df7bbe4599ad4 Mon Sep 17 00:00:00 2001 From: Olli Salonen Date: Tue, 5 May 2015 13:54:18 -0300 Subject: [PATCH] [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 Signed-off-by: Antti Palosaari Signed-off-by: Mauro Carvalho Chehab --- 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 895441fe90f7..54cb10979d99 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: -- 2.20.1