diff options
Diffstat (limited to 'drivers/media/usb/hdpvr')
| -rw-r--r-- | drivers/media/usb/hdpvr/hdpvr-i2c.c | 30 |
1 files changed, 8 insertions, 22 deletions
diff --git a/drivers/media/usb/hdpvr/hdpvr-i2c.c b/drivers/media/usb/hdpvr/hdpvr-i2c.c index 070559b01b01..9eacc85e3f11 100644 --- a/drivers/media/usb/hdpvr/hdpvr-i2c.c +++ b/drivers/media/usb/hdpvr/hdpvr-i2c.c @@ -124,32 +124,12 @@ static int hdpvr_transfer(struct i2c_adapter *i2c_adapter, struct i2c_msg *msgs, else retval = hdpvr_i2c_write(dev, 1, addr, msgs[0].buf, msgs[0].len); - } else if (num == 2) { - if (msgs[0].addr != msgs[1].addr) { - v4l2_warn(&dev->v4l2_dev, "refusing 2-phase i2c xfer with conflicting target addresses\n"); - retval = -EINVAL; - goto out; - } - - if ((msgs[0].flags & I2C_M_RD) || !(msgs[1].flags & I2C_M_RD)) { - v4l2_warn(&dev->v4l2_dev, "refusing complex xfer with r0=%d, r1=%d\n", - msgs[0].flags & I2C_M_RD, - msgs[1].flags & I2C_M_RD); - retval = -EINVAL; - goto out; - } - - /* - * Write followed by atomic read is the only complex xfer that - * we actually support here. - */ + } else { + /* do write-then-read */ retval = hdpvr_i2c_read(dev, 1, addr, msgs[0].buf, msgs[0].len, msgs[1].buf, msgs[1].len); - } else { - v4l2_warn(&dev->v4l2_dev, "refusing %d-phase i2c xfer\n", num); } -out: mutex_unlock(&dev->i2c_mutex); return retval ? retval : num; @@ -165,10 +145,16 @@ static const struct i2c_algorithm hdpvr_algo = { .functionality = hdpvr_functionality, }; +/* prevent invalid 0-length usb_control_msg and support only write-then-read */ +static const struct i2c_adapter_quirks hdpvr_quirks = { + .flags = I2C_AQ_NO_ZERO_LEN_READ | I2C_AQ_COMB_WRITE_THEN_READ, +}; + static const struct i2c_adapter hdpvr_i2c_adapter_template = { .name = "Hauppauge HD PVR I2C", .owner = THIS_MODULE, .algo = &hdpvr_algo, + .quirks = &hdpvr_quirks, }; static int hdpvr_activate_ir(struct hdpvr_device *dev) |