usbprn(7D) Devices usbprn(7D)NAMEusbprn - USB printer class driver
SYNOPSIS
#include <sys/usb/clients/printer/usb_printer.h>
#include <sys/ecppio.h>
usbprn@unit-address
DESCRIPTION
The usbprn driver is a USBA (Solaris USB Architecture) compliant client
driver that supports the USB Printer Class 1.0 specification. The
usbprn driver supports a subset of the ecpp(7D) parallel port driver
functionality. However, unlike the STREAMS-based ecpp driver, usbprn is
a character driver.
The usbprn driver supports all USB printer-class compliant printers.
For a list of recommended printers and USB parallel printer adapters,
visit http://www.sun.com/io.
The usbrpn driver includes support for communicating with many differ‐
ent printers. To use these printers, it may be nesessary to install and
configure additional format conversion packages available in the
Solaris distribution. Configuration of these conversion packages under
the Solaris printing system can be simplified through the use of the
printmgr(1M). This tool allows selection of printer manufacturer/model
information while creating a print queue. For USB connected printers,
it attempts to pre-select the the manufacturer and model information
based on the 1284 device id supplied by the printer.
UGEN (Generic USB)
The usbprn driver also supports a ugen(7D) interface allowing raw
access to the device, for example by libusb(3LIB) applications, by
passing the drivers bound to each interface. Because a libusb applica‐
tion might change the state of the device, you should not access the
device through the child interface drivers.
DEFAULT OPERATION
With certain minor exceptions (outlined in the Notes sections below),
the usbprn driver supports a subset of the ecpp(7D) ioctl interfaces:
Configuration variables are set to their default values each time the
USB printer device is attached. The write_timeout period (defined in
the ECPPIOC_SETPARMS ioctl description below) is set to 90 seconds. The
mode is set to centronics mode (ECPP_CENTRONICS). Parameters can be
changed through the ECPPIOC_SETPARMS ioctl and read through the ECP‐
PIOC_GETPARMS ioctl. Each time the USB printer device is opened, the
device is marked as busy and all further opens will return EBUSY. Once
the device is open, applications can write to the device and the driver
can send data and obtain device id and status.
Note - Unlike the ecpp(7D) driver, usbprn resets configuration vari‐
ables to their default values with each attach(9E). (The
ecpp(7D) driver resets configuration variables with each
open(2).)
WRITE OPERATION
A write(2) operation returns the number of bytes successfully written
to the device. If a failure occurs while a driver is transferring data
to printer, the contents of the status bits are captured at the time of
the error and can be retrieved by the application program using the
ECPPIOC_GETERR ioctl(2) call. The captured status information is over‐
written each time an ECPPIOC_TESTIO ioctl(2) occurs.
IOCTLS
The usbprn driver supports prnio(7I) interfaces. Note that the
PRNIOC_RESET command has no effect on USB printers.
The following ioctl(2) calls are supported for backward compatibility
and are not recommended for new applications.
ECPPIOC_GETPARMS
Gets current transfer parameters. The argument is a pointer to
struct ecpp_transfer_parms. If parameters are not configured after
the device is opened, the structure will be set to its default con‐
figuration.
Note - Unlike the ecpp(7D) driver, only the ECPP_CENTRONICS mode
is currently supported in usbprn.
ECPPIOC_SETPARMS
Sets transfer parameters. The argument is a pointer to a struct
ecpp_transfer_parms. If a parameter is out of range, EINVAL is
returned. If the peripheral or host device cannot support the
requested mode, EPROTONOSUPPORT is returned.
The transfer parameters structure is defined in <sys/ecppio.h>:
struct ecpp_transfer_parms {
int write_timeout;
int mode;
};
The write_timeout field, which specifies how long the driver will
take to transfer 8192 bytes of data to the device, is set to a
default value of 90 seconds. The write_timeout field must be
greater than one second and less than 300 seconds (five minutes.)
Note - Unlike the ecpp(7D) driver, only the ECPP_CENTRONICS mode
is currently supported in usbprn. Also, the semantics of
write_timeout in usbprn differ from ecpp(7D). Refer to
ecpp(7D) for information.
BPPIOC_TESTIO
Tests the transfer readiness of a print device and checks status
bits to determine if a write(2) will succeed. If status bits are
set, a transfer will fail. If a transfer will succeed, zero is
returned. If a transfer fails, the driver returns EIO and the state
of the status bits are captured. The captured status can be
retrieved using the BPPIOC_GETERR ioctl(2) call. BPPIOC_TESTIO and
BPPIOC_GETERR are compatible to the ioctls specified in bpp(7D).
Note - Unlike the ecpp(7D) driver, only the ECPP_CENTRONICS mode
is currently supported in usbprn. Additionally, bus_error
and timeout_occurred fields are not used in the usbprn
interface. (In ecpp(7D), timeout_occurred is used.)
BPPIOC_GETERR
Get last error status. The argument is a pointer to a struct
bpp_error_status. This structure indicates the status of all the
appropriate status bits at the time of the most recent error condi‐
tion during a write(2) call, or the status of the bits at the most
recent BPPIOC_TESTIO ioctl(2) call.
struct bpp_error_status {
char timeout_occurred; /* not used */
char bus_error; /* not used */
uchar_t pin_status; /* status of pins which
/* could cause error */
};
The pin_status field indicates possible error conditions. The error
status structure bpp_error_status is defined in the include file
<sys/bpp_io.h>. The valid bits for pin_status can be BPP_ERR_ERR,
BPP_SLCT_ERR, and BPP_PE_ERR. A set bit indicates that the associ‐
ated pin is asserted.
Note - Unlike the ecpp(7D) driver, only the ECPP_CENTRONICS mode
is currently supported in usbprn. Additionally, the
bus_error and timeout_occurred fields are not used in the
usbprn interface. (In ecpp(7D), timeout_occurred is used.)
Unlike ecpp(7D), the BPP_BUSY_ERR status bit is not sup‐
ported by USB printers.
ECPPIOC_GETDEVID
Gets the IEEE 1284 device ID from the peripheral. The argument is a
pointer to a struct ecpp_device_id. Applications should set mode to
ECPP_CENTRONICS. If another mode is used, the driver will return
EPROTONOSUPPORT. len is the length of the buffer pointed to by
addr. rlen is the actual length of the device ID string returned
from the peripheral. If the returned rlen is greater than len, the
application should call ECPPIOC_GETDEVID a second time with a buf‐
fer length equal to rlen.
The 1284 device ID structure:
struct ecpp_device_id {
int mode; /* mode to use for reading device id */
int len; /* length of buffer */
int rlen; /* actual length of device id string */
char *addr; /* buffer address */
Note - Unlike ecpp(7D), only the ECPP_CENTRONICS mode is currently
supported in usbprn.
READ OPERATION
The read operation is not supported and returns EIO.
ERRORS
EBUSY The device has been opened and another open is
attempted. An attempt has been made to unload
the driver while one of the units is open.
EINVAL An unsupported IOCTL has been received. A ECP‐
PIOC_SETPARMS ioctl(2) is attempted with an out
of range value in the ecpp_transfer_parms
structure.
EIO The driver has received an unrecoverable device
error, or the device is not responding, or the
device has stalled when attempting an access. A
write(2) or ioctl(2) did not complete due to a
peripheral access. A read(2) system call has
been issued.
ENXIO The driver has received an open(2) request for
a unit for which the attach failed.
ENODEV The driver has received an open(2) request for
a device that has been disconnected.
EPROTONOSUPPORT The driver has received a ECPPIOC_SETPARMS
ioctl(2) for a mode argument other than
ECPP_CENTRONICS in the ecpp_transfer_parms
structure.
FILES
/kernel/drv/usbprn
32-bit x86 ELF kernel module
/kernel/drv/amd64/usbprn
64-bit x86 ELF kernel module
/kernel/drv/sparcv9/usbprn
64-bit SPARC ELF kernel module
/dev/usb/*/*/*
ugen(7D) nodes.
/dev/printers/n
Character special files
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬──────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼──────────────────────────────┤
│Architecture │SPARC, x86, PCI-based systems │
├─────────────────────────────┼──────────────────────────────┤
│Availability │SUNWusb │
└─────────────────────────────┴──────────────────────────────┘
SEE ALSOcfgadm_usb(1M), printmgr(1M), ioctl(2), open(2), read(2), write(2),
libusb(3LIB), attributes(5), bpp(7D), ecpp(7D), ugen(7D),
usba(7D)prnio(7I), attach(9E)
Writing Device Drivers
Universal Serial Bus Specification 1.0 and 1.1
USB Device Class Definition for Printing Devices 1.0
System Administration Guide: Basic Administration
http://www.sun.com/io
DIAGNOSTICS
In addition to being logged, the following messages may appear on the
system console. All messages are formatted in the following manner:
Warning: <device path> (usbprn<instance num>): Error Message...
Device was disconnected while open. Data may have been lost.
The device has been hot-removed or powered off while it was open
and a possible data transfer was in progress. The job may be
aborted.
Cannot access <device>. Please reconnect.
There was an error in accessing the printer during reconnect.
Please reconnect the device.
Device is not identical to the previous one on this port. Please dis‐
connect and reconnect.
A USB printer was hot-removed while open. A new device was hot-
inserted which is not identical to the original USB printer. Please
disconnect the USB device and reconnect the printer to the same
port.
Printer has been reconnected but data may have been lost.
The printer that was hot-removed from its USB port has been re-
inserted again to the same port. It is available for access but the
job that was running prior to the hot-removal may be lost.
NOTES
The USB printer will be power managed if the device is closed.
If a printer is hot-removed before a job completes, the job is termi‐
nated and the driver will return EIO. All subsequent opens will return
ENODEV. If a printer is hot-removed, an LP reconfiguration may not be
needed if a printer is re-inserted on the same port. If re-inserted on
a different port, an LP reconfiguration may be required.
The USB Parallel Printer Adapter is not hotpluggable. The printer
should be connected to USB Parallel Printer Adapter before plugging the
USB cable into host or hub port and should be removed only after dis‐
connecting the USB cable of USB Parallel Printer Adapter from the host
or hub port.
SunOS 5.10 18 June 2005 usbprn(7D)
