diff options
-rw-r--r-- | src/drivers/lsm303d/lsm303d.cpp | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/src/drivers/lsm303d/lsm303d.cpp b/src/drivers/lsm303d/lsm303d.cpp index d9801f88f..7a65f644a 100644 --- a/src/drivers/lsm303d/lsm303d.cpp +++ b/src/drivers/lsm303d/lsm303d.cpp @@ -811,8 +811,34 @@ LSM303D::mag_ioctl(struct file *filp, int cmd, unsigned long arg) return SENSOR_POLLRATE_MANUAL; return 1000000 / _call_mag_interval; - case SENSORIOCSQUEUEDEPTH: + + case SENSORIOCSQUEUEDEPTH: { + /* account for sentinel in the ring */ + arg++; + + /* lower bound is mandatory, upper bound is a sanity check */ + if ((arg < 2) || (arg > 100)) + return -EINVAL; + + /* allocate new buffer */ + struct mag_report *buf = new struct mag_report[arg]; + + if (nullptr == buf) + return -ENOMEM; + + /* reset the measurement state machine with the new buffer, free the old */ + stop(); + delete[] _mag_reports; + _num_mag_reports = arg; + _mag_reports = buf; + start(); + + return OK; + } + case SENSORIOCGQUEUEDEPTH: + return _num_mag_reports - 1; + case SENSORIOCRESET: return ioctl(filp, cmd, arg); |