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[media] af9035: implement I2C adapter read operation 

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Antti Palosaari 2013-03-11 19:05:39 -03:00 committed by Mauro Carvalho Chehab
parent a7fab85111
commit 3b98c34783
1 changed files with 20 additions and 2 deletions
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22
drivers/media/usb/dvb-usb-v2/af9035.c
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@ -268,11 +268,29 @@ 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;
}