diff options
Diffstat (limited to 'backend/gt68xx_low.c')
| -rw-r--r-- | backend/gt68xx_low.c | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/backend/gt68xx_low.c b/backend/gt68xx_low.c index 3ea4590..5aa84ac 100644 --- a/backend/gt68xx_low.c +++ b/backend/gt68xx_low.c @@ -16,9 +16,7 @@ General Public License for more details. You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place - Suite 330, Boston, - MA 02111-1307, USA. + along with this program. If not, see <https://www.gnu.org/licenses/>. As a special exception, the authors of SANE give permission for additional uses of the libraries contained in this release of SANE. @@ -176,6 +174,8 @@ gt68xx_device_new (GT68xx_Device ** dev_return) dev->manual_selection = SANE_FALSE; + dev->scan_started = SANE_FALSE; + #ifdef USE_FORK dev->shm_channel = NULL; #endif /* USE_FORK */ @@ -626,7 +626,14 @@ gt68xx_device_start_scan (GT68xx_Device * dev) { CHECK_DEV_ACTIVE (dev, "gt68xx_device_start_scan"); if (dev->model->command_set->start_scan) - return (*dev->model->command_set->start_scan) (dev); + { + if (!dev->scan_started) + { + dev->scan_started = SANE_TRUE; + return (*dev->model->command_set->start_scan) (dev); + } + return SANE_STATUS_DEVICE_BUSY; + } else return SANE_STATUS_UNSUPPORTED; } @@ -681,7 +688,14 @@ gt68xx_device_stop_scan (GT68xx_Device * dev) { CHECK_DEV_ACTIVE (dev, "gt68xx_device_stop_scan"); if (dev->model->command_set->stop_scan) - return (*dev->model->command_set->stop_scan) (dev); + { + if (dev->scan_started) + { + dev->scan_started = SANE_FALSE; + return (*dev->model->command_set->stop_scan) (dev); + } + return SANE_STATUS_GOOD; // Essentially a NOP. + } else return SANE_STATUS_UNSUPPORTED; } |