kopia lustrzana https://gitlab.com/sane-project/backends
310 wiersze
11 KiB
C
310 wiersze
11 KiB
C
/* sane - Scanner Access Now Easy.
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Copyright (C) 1996, 1997 David Mosberger-Tang
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This file is part of the SANE package.
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SANE is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SANE is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with sane; see the file COPYING. If not, write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/** @file sanei_scsi.h
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* Generic interface to SCSI drivers.
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* @sa sanei_usb.h, sanei_ab306.h,sanei_lm983x.h, sanei_pa4s2.h, sanei_pio.h,
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* and man sane-scsi(5) for user-oriented documentation
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*/
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#ifndef sanei_scsi_h
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#define sanei_scsi_h
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#include <sys/types.h>
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#include <sane/sane.h>
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/** Sense handler
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*
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* The sense handler can be implemented in backends. It's for deciding
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* which sense codes should be considered an error and which shouldn't.
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*
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* @param fd file descriptor
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* @param sense_buffer pointer to buffer containing sense codes
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* @param arg pointer to data buffer
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*
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* @return
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* - SANE_STATUS_GOOD - on success (sense isn't regarded as error)
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* - any other status if sense code is regarded as error
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*/
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typedef SANE_Status (*SANEI_SCSI_Sense_Handler) (int fd,
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u_char *sense_buffer,
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void *arg);
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/** Maximum size of a SCSI request
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*/
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extern int sanei_scsi_max_request_size;
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/** Find SCSI devices.
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*
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* Find each SCSI device that matches the pattern specified by the
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* arguments. String arguments can be "omitted" by passing NULL,
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* integer arguments can be "omitted" by passing -1.
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*
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* Example: vendor="HP" model=NULL, type=NULL, bus=3, id=-1, lun=-1 would
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* attach all HP devices on SCSI bus 3.
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*
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* @param vendor
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* @param model
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* @param type
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* @param bus
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* @param channel
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* @param id
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* @param lun
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* @param attach callback invoked once for each device
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* @param dev real devicename (passed to attach callback)
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*
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*/
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extern void sanei_scsi_find_devices (const char *vendor, const char *model,
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const char *type,
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int bus, int channel, int id, int lun,
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SANE_Status (*attach) (const char *dev));
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/** Open a SCSI device
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*
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* Opens a SCSI device by its device filename and returns a file descriptor.
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* If it's necessary to adjust the SCSI buffer size, use
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* sanei_scsi_open_extended().
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*
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* @param devicename name of the devicefile, e.g. "/dev/sg0"
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* @param fd file descriptor
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* @param sense_handler called whenever the SCSI driver returns a sense buffer
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* @param sense_arg pointer to data for the sense handler
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*
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* @return
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* - SANE_STATUS_GOOD - on success
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* - SANE_STATUS_ACCESS_DENIED - if the file couldn't be accessed due to
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* permissions
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* - SANE_STATUS_NO_MEM - if malloc failed (not enough memory)
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* - SANE_STATUS_INVAL - if the filename was invalid or an unknown error occured
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*
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* @sa sanei_scsi_open_extended(), HAVE_SANEI_SCSI_OPEN_EXTENDED
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*/
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extern SANE_Status sanei_scsi_open (const char * device_name, int * fd,
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SANEI_SCSI_Sense_Handler sense_handler,
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void *sense_arg);
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/** Open a SCSI device and set the buffer size
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*
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* The extended open call allows a backend to ask for a specific buffer
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* size. sanei_scsi_open_extended() tries to allocate a buffer of the size
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* given by *buffersize upon entry to this function. If
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* sanei_scsi_open_extended returns successfully, *buffersize contains the
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* available buffer size. This value may be both smaller or larger than the
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* value requested by the backend; it can even be zero. The backend must
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* decide, if it got enough buffer memory to work.
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*
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* Note that the value of *buffersize may differ for different files.
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*
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* @param devicename name of the devicefile, e.g. "/dev/sg0"
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* @param fd file descriptor
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* @param sense_handler called whenever the SCSI driver returns a sense buffer
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* @param sense_arg pointer to data for the sense handler
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* @param buffersize size of the SCAI request buffer (in bytes)
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*
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* @return
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* - SANE_STATUS_GOOD - on success
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* - SANE_STATUS_ACCESS_DENIED - if the file couldn't be accessed due to
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* permissions
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* - SANE_STATUS_NO_MEM - if malloc failed (not enough memory)
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* - SANE_STATUS_INVAL - if the filename was invalid or an unknown error occured
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*
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* @sa sanei_scsi_open(), HAVE_SANEI_SCSI_OPEN_EXTENDED
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*/
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extern SANE_Status sanei_scsi_open_extended (
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const char * device_name, int * fd,
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SANEI_SCSI_Sense_Handler sense_handler,
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void *sense_arg, int *buffersize);
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/** Do we have sanei_scsi_open_extended()?
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*
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* Let backends decide, which open call to use: if
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* HAVE_SANEI_SCSI_OPEN_EXTENDED is defined, sanei_scsi_open_extended may be
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* used. May also be used to decide, if sanei_scsi_req_flush_all or
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* sanei_scsi_req_flush_all_extended() should be used.
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*
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* @sa sanei_scsi_open(), sanei_scsi_open_extended()
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*/
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#define HAVE_SANEI_SCSI_OPEN_EXTENDED
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/** Enqueue SCSI command
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*
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* One or more scsi commands can be enqueued by calling sanei_scsi_req_enter().
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*
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* NOTE: Some systems may not support multiple outstanding commands. On such
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* systems, sanei_scsi_req_enter() may block. In other words, it is not proper
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* to assume that enter() is a non-blocking routine.
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*
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* @param fd file descriptor
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* @param src pointer to the SCSI command and associated write data (if any)
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* @param src_size length of the command and data
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* @param dst pointer to a buffer in which data is returned; NULL if no data is
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* returned
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* @param dst_size on input, the size of the buffer pointed to by dst, on exit,
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* set to the number of bytes returned in the buffer (which is less than or equal
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* to the buffer size; may be NULL if no data is expected
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* @param idp pointer to a void* that uniquely identifies the entered request
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*
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* @return
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* - SANE_STATUS_GOOD - on success
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* - SANE_STATUS_IO_ERROR - if an error was received from the SCSI driver
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* - SANE_STATUS_NO_MEM - if malloc failed (not enough memory)
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* - SANE_STATUS_INVAL - if a locking or an unknown error occured
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* @sa sanei_scsi_req_enter2()
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*
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*/
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extern SANE_Status sanei_scsi_req_enter (int fd,
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const void * src, size_t src_size,
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void * dst, size_t * dst_size,
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void **idp);
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/** Enqueue SCSI command and separated data
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*
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* Same as sanei_scsi_req_enter(), but with separate buffers for the SCSI
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* command and for the data to be sent to the device.
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*
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* With sanei_scsi_req_enter(), the length of te SCSI command block must be
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* guessed. While that works in most cases, Canon scanners for example use the
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* vendor specific commands 0xd4, 0xd5 and 0xd6. The Canon scanners want to
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* get 6 byte command blocks for these commands, but sanei_scsi_req_enter() and
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* sanei_scsi_cmd() send 12 bytes.
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*
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* If dst_size and *dst_size are non-zero, a "read command" (ie, data transfer
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* from the device to the host) is assumed.
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*
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* @param fd file descriptor
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* @param cmd pointer to SCSI command
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* @param cmd_size size of the command
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* @param src pointer to the buffer with data to be sent to the scanner
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* @param src_size size of src buffer
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* @param dst pointer to a buffer in which data is returned; NULL if no data is
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* returned
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* @param dst_size on input, the size of the buffer pointed to by dst, on exit,
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* set to the number of bytes returned in the buffer (which is less than or equal
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* to the buffer size; may be NULL if no data is expected
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* @param idp pointer to a void* that uniquely identifies the entered request
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* @return
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* - SANE_STATUS_GOOD - on success
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* - SANE_STATUS_IO_ERROR - if an error was received from the SCSI driver
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* - SANE_STATUS_NO_MEM - if malloc failed (not enough memory)
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* - SANE_STATUS_INVAL - if a locking or an unknown error occured
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* @sa sanei_scsi_req_enter()
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*/
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extern SANE_Status sanei_scsi_req_enter2 (int fd,
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const void * cmd, size_t cmd_size,
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const void * src, size_t src_size,
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void * dst, size_t * dst_size,
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void **idp);
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/** Wait for SCSI command
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*
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* Wait for the completion of the SCSI command with id ID.
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*
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* @param id id used in sanei_scsi_req_enter()
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*
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* @return
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* - SANE_STATUS_GOOD - on success
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* - SANE_STATUS_DEVICE_BUSY - if the device is busy (try again later)
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* - SANE_STATUS_IO_ERROR - if an error was received from the SCSI driver
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*/
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extern SANE_Status sanei_scsi_req_wait (void *id);
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/** Send SCSI command
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*
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* This is a convenience function that is equivalent to a pair of
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* sanei_scsi_req_enter()/sanei_scsi_req_wait() calls.
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*
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* @param fd file descriptor
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* @param src pointer to the SCSI command and associated write data (if any)
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* @param src_size length of the command and data
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* @param dst pointer to a buffer in which data is returned; NULL if no data is
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* returned
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* @param dst_size on input, the size of the buffer pointed to by dst, on exit,
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* set to the number of bytes returned in the buffer (which is less than or equal
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* to the buffer size; may be NULL if no data is expected
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*
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* @return
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* - SANE_STATUS_GOOD - on success
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* - SANE_STATUS_IO_ERROR - if an error was received from the SCSI driver
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* - SANE_STATUS_NO_MEM - if malloc failed (not enough memory)
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* - SANE_STATUS_INVAL - if a locking or an unknown error occured
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*
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* @sa sanei_scsi_cmd2(), sanei_scsi_req_enter(), sanei_scsi_req_wait()
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*/
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extern SANE_Status sanei_scsi_cmd (int fd,
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const void * src, size_t src_size,
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void * dst, size_t * dst_size);
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/** Send SCSI command and separated data
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*
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* This is a convenience function that is equivalent to a pair of
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* sanei_scsi_req_enter2()/sanei_scsi_req_wait() calls.
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*
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* @param fd file descriptor
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* @param cmd pointer to SCSI command
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* @param cmd_size size of the command
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* @param src pointer to the buffer with data to be sent to the scanner
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* @param src_size size of src buffer
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* @param dst pointer to a buffer in which data is returned; NULL if no data is
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* returned
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* @param dst_size on input, the size of the buffer pointed to by dst, on exit,
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* set to the number of bytes returned in the buffer (which is less than or equal
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* to the buffer size; may be NULL if no data is expected
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* @return
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* - SANE_STATUS_GOOD - on success
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* - SANE_STATUS_IO_ERROR - if an error was received from the SCSI driver
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* - SANE_STATUS_NO_MEM - if malloc failed (not enough memory)
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* - SANE_STATUS_INVAL - if a locking or an unknown error occured
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*
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* @sa sanei_scsi_cmd(), sanei_scsi_req_enter(), sanei_scsi_req_wait()
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*/
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extern SANE_Status sanei_scsi_cmd2 (int fd,
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const void * cmd, size_t cmd_size,
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const void * src, size_t src_size,
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void * dst, size_t * dst_size);
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/** Flush queue
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*
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* Flush all pending SCSI commands. This function work only, if zero or one
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* SCSI file handles are open.
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*
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* @sa sanei_scsi_req_flush_all_extended()
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*/
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extern void sanei_scsi_req_flush_all (void);
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/** Flush queue for handle
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*
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* Flush all SCSI commands pending for one handle
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*
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* @param fd file descriptor
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*
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* @sa sanei_scsi_req_flush_all()
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*/
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extern void sanei_scsi_req_flush_all_extended (int fd);
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/** Close a SCSI device
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*
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* @param fd file descriptor
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*
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*/
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extern void sanei_scsi_close (int fd);
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#endif /* sanei_scsi_h */
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