protocol.h 1.6 KB

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  1. /* SPDX-License-Identifier: GPL-2.0+ */
  2. /*
  3. * Driver for USB Mass Storage compliant devices
  4. * Protocol Functions Header File
  5. *
  6. * Current development and maintenance by:
  7. * (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
  8. *
  9. * This driver is based on the 'USB Mass Storage Class' document. This
  10. * describes in detail the protocol used to communicate with such
  11. * devices. Clearly, the designers had SCSI and ATAPI commands in
  12. * mind when they created this document. The commands are all very
  13. * similar to commands in the SCSI-II and ATAPI specifications.
  14. *
  15. * It is important to note that in a number of cases this class
  16. * exhibits class-specific exemptions from the USB specification.
  17. * Notably the usage of NAK, STALL and ACK differs from the norm, in
  18. * that they are used to communicate wait, failed and OK on commands.
  19. *
  20. * Also, for certain devices, the interrupt endpoint is used to convey
  21. * status of a command.
  22. */
  23. #ifndef _PROTOCOL_H_
  24. #define _PROTOCOL_H_
  25. /* Protocol handling routines */
  26. extern void usb_stor_pad12_command(struct scsi_cmnd*, struct us_data*);
  27. extern void usb_stor_ufi_command(struct scsi_cmnd*, struct us_data*);
  28. extern void usb_stor_transparent_scsi_command(struct scsi_cmnd*,
  29. struct us_data*);
  30. /* struct scsi_cmnd transfer buffer access utilities */
  31. enum xfer_buf_dir {TO_XFER_BUF, FROM_XFER_BUF};
  32. extern unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
  33. unsigned int buflen, struct scsi_cmnd *srb, struct scatterlist **,
  34. unsigned int *offset, enum xfer_buf_dir dir);
  35. extern void usb_stor_set_xfer_buf(unsigned char *buffer,
  36. unsigned int buflen, struct scsi_cmnd *srb);
  37. #endif