[Spice-devel] [spice-gtk v4 08/13] cd-sharing: added interface file for USB mass storage device

[Yuri Benditovich]

The file defines interface for external software that
manages bulk USB mass storage device

Signed-off-by: Alexander Nezhinsky <alexander at daynix.com>
---
 src/cd-usb-bulk-msd.h | 134 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 src/cd-usb-bulk-msd.h

diff --git a/src/cd-usb-bulk-msd.h b/src/cd-usb-bulk-msd.h
new file mode 100644
index 0000000..1098a87
--- /dev/null
+++ b/src/cd-usb-bulk-msd.h
@@ -0,0 +1,134 @@
+/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/*
+    Copyright (C) 2018 Red Hat, Inc.
+
+    Red Hat Authors:
+    Alexander Nezhinsky<anezhins at redhat.com>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __CD_USB_BULK_MSD_H__
+#define __CD_USB_BULK_MSD_H__
+
+G_BEGIN_DECLS
+
+#include <gio/gio.h>
+
+#include "cd-scsi-dev-params.h"
+
+typedef enum _CdUsbBulkStatus
+{
+    BULK_STATUS_GOOD = 0,
+    BULK_STATUS_ERROR,
+    BULK_STATUS_CANCELED,
+    BULK_STATUS_STALL,
+} CdUsbBulkStatus;
+
+/* USB backend callbacks */
+
+/* called on completed read data bulk transfer
+   user_data - user_data in unit parameters structure
+   status - bulk status code
+*/
+void cd_usb_bulk_msd_read_complete(void *user_data,
+                                   uint8_t *data, uint32_t length,
+                                   CdUsbBulkStatus status);
+
+/* called when state of device's unit changed to signal GUI component
+   user_data - user_data in unit parameters structure
+*/
+void cd_usb_bulk_msd_lun_changed(void *user_data, uint32_t lun);
+
+/* called on completed device reset
+   user_data - user_data in unit parameters structure
+   status - error code
+*/
+void cd_usb_bulk_msd_reset_complete(void *user_data,
+                                    int status);
+
+/* MSD backend api */
+
+/* allocate new device descriptor */
+void *cd_usb_bulk_msd_alloc(void *user_data, uint32_t max_lun);
+
+/* free device descriptor */
+void cd_usb_bulk_msd_free(void *device);
+
+/* configure a new Logical Unit to be represented by the device
+   returns: error code
+*/
+int cd_usb_bulk_msd_realize(void *device, uint32_t lun,
+                            const CdScsiDeviceParameters *dev_params);
+
+/* lock the device, prevent unloading
+   returns: error code
+*/
+int cd_usb_bulk_msd_lock(void *device, uint32_t lun, gboolean lock);
+
+/* load new media, if already loaded, simulate media change
+   returns: error code
+*/
+int cd_usb_bulk_msd_load(void *device, uint32_t lun,
+                         const CdScsiMediaParameters *media_params);
+
+/* query unit parameters and status
+   returns: error code
+*/
+int cd_usb_bulk_msd_get_info(void *device, uint32_t lun,
+                             CdScsiDeviceInfo *lun_info);
+
+/* unload the media
+   returns: error code
+*/
+int cd_usb_bulk_msd_unload(void *device, uint32_t lun);
+
+/* detach a Logical Unit
+   returns: error code
+*/
+int cd_usb_bulk_msd_unrealize(void *device, uint32_t lun);
+
+/* reset the device instance; cancel all IO ops, reset state
+   returns: error code
+*/
+int cd_usb_bulk_msd_reset(void *device);
+
+
+/* perform a write data bulk transfer
+   data_len - length of available data to write
+   returns: error code
+*/
+int cd_usb_bulk_msd_write(void *device,
+                          uint8_t *buf, uint32_t data_len);
+
+
+/* perform a read data bulk transfer
+   max_len - length of available buffer to fill
+   If data available immediately, should call cd_usb_bulk_msd_read_complete()
+     and return success
+   If fatal error detected immediately, should call cd_usb_bulk_msd_read_complete()
+     with error code and return success
+
+   returns: 0 - success, -1 - error
+*/
+int cd_usb_bulk_msd_read(void *device, uint32_t max_len);
+
+/* cancels pending read data bulk transfer
+   returns: error code
+*/
+int cd_usb_bulk_msd_cancel_read(void *device);
+
+G_END_DECLS
+
+#endif /* __CD_USB_BULK_MSD_H__ */
-- 
2.9.4