diff options
| -rw-r--r-- | drivers/media/dvb-frontends/tc90522.c | 27 | ||||
| -rw-r--r-- | drivers/media/dvb-frontends/tc90522.h | 3 |
2 files changed, 28 insertions, 2 deletions
diff --git a/drivers/media/dvb-frontends/tc90522.c b/drivers/media/dvb-frontends/tc90522.c index 849d63dbc279..e83836b29715 100644 --- a/drivers/media/dvb-frontends/tc90522.c +++ b/drivers/media/dvb-frontends/tc90522.c @@ -685,10 +685,33 @@ tc90522_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) p += new_msgs[j].len; } - if (i < num) + if (i < num) { ret = -ENOMEM; - else + } else if (!state->cfg.split_tuner_read_i2c || rd_num == 0) { ret = i2c_transfer(state->i2c_client->adapter, new_msgs, j); + } else { + /* + * Split transactions at each I2C_M_RD message. + * Some of the parent device require this, + * such as Friio (see. dvb-usb-gl861). + */ + int from, to; + + ret = 0; + from = 0; + do { + int r; + + to = from + 1; + while (to < j && !(new_msgs[to].flags & I2C_M_RD)) + to++; + r = i2c_transfer(state->i2c_client->adapter, + &new_msgs[from], to - from); + ret = (r <= 0) ? r : ret + r; + from = to; + } while (from < j && ret > 0); + } + if (ret >= 0 && ret < j) ret = -EIO; kfree(new_msgs); diff --git a/drivers/media/dvb-frontends/tc90522.h b/drivers/media/dvb-frontends/tc90522.h index ac0e2ab51924..07e3813bf590 100644 --- a/drivers/media/dvb-frontends/tc90522.h +++ b/drivers/media/dvb-frontends/tc90522.h @@ -28,6 +28,9 @@ struct tc90522_config { /* [OUT] tuner I2C adapter returned by driver */ struct i2c_adapter *tuner_i2c; + + /* [IN] use two separate I2C transactions for one tuner read */ + bool split_tuner_read_i2c; }; #endif /* TC90522_H */ |