/* SPDX-License-Identifier: GPL-2.0+ */ /* * Driver for USB Mass Storage compliant devices * Transport Functions Header File * * Current development and maintenance by: * (c) 1999, 2000 Matthew Dharm ([email protected]) * * This driver is based on the 'USB Mass Storage Class' document. This * describes in detail the protocol used to communicate with such * devices. Clearly, the designers had SCSI and ATAPI commands in * mind when they created this document. The commands are all very * similar to commands in the SCSI-II and ATAPI specifications. * * It is important to note that in a number of cases this class * exhibits class-specific exemptions from the USB specification. * Notably the usage of NAK, STALL and ACK differs from the norm, in * that they are used to communicate wait, failed and OK on commands. * * Also, for certain devices, the interrupt endpoint is used to convey * status of a command. */ #ifndef _TRANSPORT_H_ #define _TRANSPORT_H_ #include <linux/blkdev.h> /* * usb_stor_bulk_transfer_xxx() return codes, in order of severity */ #define USB_STOR_XFER_GOOD … #define USB_STOR_XFER_SHORT … #define USB_STOR_XFER_STALLED … #define USB_STOR_XFER_LONG … #define USB_STOR_XFER_ERROR … /* * Transport return codes */ #define USB_STOR_TRANSPORT_GOOD … #define USB_STOR_TRANSPORT_FAILED … #define USB_STOR_TRANSPORT_NO_SENSE … #define USB_STOR_TRANSPORT_ERROR … /* * We used to have USB_STOR_XFER_ABORTED and USB_STOR_TRANSPORT_ABORTED * return codes. But now the transport and low-level transfer routines * treat an abort as just another error (-ENOENT for a cancelled URB). * It is up to the invoke_transport() function to test for aborts and * distinguish them from genuine communication errors. */ /* * CBI accept device specific command */ #define US_CBI_ADSC … extern int usb_stor_CB_transport(struct scsi_cmnd *, struct us_data*); extern int usb_stor_CB_reset(struct us_data*); extern int usb_stor_Bulk_transport(struct scsi_cmnd *, struct us_data*); extern int usb_stor_Bulk_max_lun(struct us_data*); extern int usb_stor_Bulk_reset(struct us_data*); extern void usb_stor_invoke_transport(struct scsi_cmnd *, struct us_data*); extern void usb_stor_stop_transport(struct us_data*); extern int usb_stor_control_msg(struct us_data *us, unsigned int pipe, u8 request, u8 requesttype, u16 value, u16 index, void *data, u16 size, int timeout); extern int usb_stor_clear_halt(struct us_data *us, unsigned int pipe); extern int usb_stor_ctrl_transfer(struct us_data *us, unsigned int pipe, u8 request, u8 requesttype, u16 value, u16 index, void *data, u16 size); extern int usb_stor_bulk_transfer_buf(struct us_data *us, unsigned int pipe, void *buf, unsigned int length, unsigned int *act_len); extern int usb_stor_bulk_transfer_sg(struct us_data *us, unsigned int pipe, void *buf, unsigned int length, int use_sg, int *residual); extern int usb_stor_bulk_srb(struct us_data* us, unsigned int pipe, struct scsi_cmnd* srb); extern int usb_stor_port_reset(struct us_data *us); #endif
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