[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 b638fc1..cfcf79b 100644
--- a/drivers/media/usb/dvb-usb-v2/af9035.c
+++ b/drivers/media/usb/dvb-usb-v2/af9035.c
@@ -268,11 +268,29 @@
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;
}