12745 man page typos
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If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner] 6 .TH ECPP 7D "May 17, 2020" 7 .SH NAME 8 ecpp \- IEEE 1284 compliant parallel port driver 9 .SH SYNOPSIS 10 .nf 11 #include <sys/types.h> 12 .fi 13 14 .LP 15 .nf 16 #include <sys/ecppio.h> 17 .fi 18 19 .LP 20 .nf 21 ecpp@unit-address 22 .fi 23 24 .SH DESCRIPTION 25 The \fBecpp\fR driver provides a bi-directional interface to \fIIEEE 1284\fR 26 compliant devices as well as a forward single-directional interface to 27 Centronics devices. In addition to the Centronics protocol, the \fBecpp\fR 28 driver supports the \fIIEEE 1284\fR Compatibility, Nibble, and ECP protocols. 29 \fBECPP_COMPAT_MODE\fR and \fBECPP_CENTRONICS\fR modes of operation have 30 logically identical handshaking protocols, however devices that support 31 \fBECPP_COMPAT_MODE\fR are \fIIEEE 1284\fR compliant devices. \fIIEEE 1284\fR 32 compliant devices support at least \fBECPP_COMPAT_MODE\fR and 33 \fBECPP_NIBBLE_MODE\fR. Centronics devices support only \fBECPP_CENTRONICS\fR 34 mode. 35 .sp 36 .LP 37 By default, \fBECPP_COMPAT_MODE\fR devices have a strobe handshaking pulse 38 width of 500ns. For this mode, forward data transfers are conducted by DMA. By 39 default, the strobe pulse width for \fBECPP_CENTRONICS\fR devices is two 40 microseconds. Forward transfers for these devices are managed through PIO. The 41 default characteristics for both \fBECPP_COMPAT_MODE\fR and 42 \fBECPP_CENTRONICS\fR devices may be changed through tunable variables defined 43 in \fBecpp.conf\fR. 44 .sp 45 .LP 46 The \fBecpp\fR driver is an \fIexclusive-use\fR device, meaning that if the 47 device is already open, subsequent opens fail with \fBEBUSY\fR. 48 .SS "Default Operation" 49 Each time the \fBecpp\fR device is opened, the device is marked as \fBEBUSY\fR 50 and the configuration variables are set to their default values. The 51 \fBwrite_timeout\fR period is set to 90 seconds. 52 .sp 53 .LP 54 The driver sets the mode variable according to the following algorithm: The 55 driver initially attempts to negotiate the link into \fBECPP_ECP_MODE\fR during 56 \fBopen\fR(2). If it fails, the driver tries to negotiate into 57 \fBECPP_NIBBLE_MODE\fR mode. If that fails, the driver operates in 58 \fBECPP_CENTRONICS\fR mode. Upon successfully opening the device, \fIIEEE 59 1284\fR compliant devices will be left idle in either reverse idle phase of 60 \fBECPP_ECP_MODE\fR or in \fBECPP_NIBBLE_MODE\fR. Subsequent calls to 61 \fBwrite\fR(2) invokes the driver to move the link into either 62 \fBECPP_COMPAT_MODE\fR or the forward phase of \fBECPP_ECP_MODE\fR. After the 63 transfer completes, the link returns to idle state. 64 .sp 65 .LP 66 The application may attempt to negotiate the device into a specific mode or set 67 the \fBwrite_timeout\fR values through the \fBECPPIOC_SETPARMS\fR 68 \fBioctl\fR(2) call. For mode negotiation to be successful, both the host 69 workstation and the peripheral must support the requested mode. 70 .SS "Tunables" 71 Characteristics of the \fBecpp\fR driver may be tuned by the variables 72 described in \fB/kernel/drv/ecpp.conf\fR. These variables are read by the 73 kernel during system startup. To tune the variables, edit the \fBecpp.conf\fR 74 file and invoke \fBupdate_drv\fR(1M) to have the kernel read the file again. 75 .sp 76 .LP 77 Some Centronics peripherals and certain \fIIEEE 1284\fR compatible peripherals 78 will not operate with the parallel port operating in a fast handshaking mode. 79 If printing problems occur, set "fast-centronics" and "fast-1284-compatible" to 80 "false." See \fB/kernel/drv/ecpp.conf\fR for more information. 81 .SS "Read/Write Operation" 82 The \fBecpp\fR driver is a full duplex STREAMS device driver. While an 83 application is writing to an \fIIEEE 1284\fR compliant device, another thread 84 may read from it. 85 .SS "Write Operation" 86 A \fBwrite\fR(2) operation returns the number of bytes successfully written to 87 the stream head. If a failure occurs while a Centronics device is transferring 88 data, the content of the status bits will be captured at the time of the error 89 and can be retrieved by the application program using the \fBBPPIOC_GETERR\fR 90 \fBioctl\fR(2) call. The captured status information is overwritten each time 91 an attempted transfer or a \fBBPPIOC_TESTIO\fR \fBioctl\fR(2) occurs. 92 .SS "Read Operation" 93 If a failure or error condition occurs during a \fBread\fR(2), the number of 94 bytes successfully read is returned (short read). When attempting to read a 95 port that has no data currently available, \fBread\fR(2) returns \fB0\fR if 96 \fBO_NDELAY\fR is set. If \fBO_NONBLOCK\fR is set, \fBread\fR(2) returns 97 \fB-1\fR and sets errno to \fBEAGAIN.\fR If \fBO_NDELAY\fR and \fBO_NONBLOCK\fR 98 are clear, \fBread\fR(2) blocks until data become available. 99 .SH IOCTLS 100 The \fBioctl\fR(2) calls described below are supported. Note that when 101 \fBecpp\fR is transferring data, the driver waits until the data has been sent 102 to the device before processing the \fBioctl\fR(2) call. 103 .sp 104 .LP 105 The ecpp driver supports \fBprnio\fR(7I) interfaces. 106 .LP 107 Note - 108 .sp 109 .RS 2 110 The \fBPRNIOC_RESET\fR command toggles the \fBnInit\fR signal for 2 ms, 111 followed by default negotiation. 112 .RE 113 .sp 114 .LP 115 The following \fBioctl\fR(2) calls are supported for backward compatibility and 116 are not recommended for new applications: 117 .sp 118 .ne 2 119 .na 120 \fB\fBECPPIOC_GETPARMS\fR\fR 121 .ad 122 .RS 20n 123 Get current transfer parameters. The argument is a pointer to a struct 124 \fBecpp_transfer_parms\fR. See below for a description of the elements of this 125 structure. If no parameters have been configured since the device was opened, 126 the structure will be set to its default configuration. See Default Operation 127 above for more information. 128 .RE 129 130 .sp 131 .ne 2 132 .na 133 \fB\fBECPPIOC_SETPARMS\fR\fR 134 .ad 135 .RS 20n 136 Set transfer parameters. The argument is a pointer to a struct 137 \fBecpp_transfer_parms\fR. If a parameter is out of range, \fBEINVAL\fR is 138 returned. If the peripheral or host device cannot support the requested mode, 139 \fBEPROTONOSUPPORT\fR is returned. See below for a description of 140 \fBecpp_transfer_parms\fR and its valid parameters. 141 .sp 142 The Transfer Parameters Structure is defined in <\fBsys/ecppio.h\fR>. 143 .sp 144 .in +2 145 .nf 146 struct ecpp_transfer_parms { 147 int write_timeout; 148 int mode; 149 }; 150 .fi 151 .in -2 152 153 The \fBwrite_timeout\fR field is set to the value of 154 \fBecpp-transfer-timeout\fR specified in the \fBecpp.conf\fR. The 155 \fBwrite_timeout\fR field specifies how long the driver will wait for the 156 peripheral to respond to a transfer request. The value must be greater than 157 \fB0\fR and less than \fBECPP_MAX_TIMEOUT.\fR All other values are out of 158 range. 159 .sp 160 The mode field reflects the \fIIEEE 1284\fR mode to which the parallel port is 161 currently configured. The mode may be set to one of the following values only: 162 \fBECPP_CENTRONICS\fR, \fBECPP_COMPAT_MODE\fR, \fBECPP_NIBBLE_MODE\fR, 163 \fBECPP_ECP_MODE\fR. All other values are invalid. If the requested mode is not 164 supported, \fBECPPIOC_SETPARMS\fR will return \fBEPROTONOSUPPORT\fR and the 165 mode will be set to \fBECPP_CENTRONICS\fR mode. Afterwards, the application may 166 change the mode back to the original mode with \fBECPPIOC_SETPARMS\fR. 167 .RE 168 169 .sp 170 .ne 2 171 .na 172 \fB\fBECPPIOC_GETDEVID\fR\fR 173 .ad 174 .RS 20n 175 This ioctl gets the \fIIEEE 1284\fR device ID from the peripheral in specified 176 mode. Currently, the device ID can be retrieved only in Nibble mode. A pointer 177 to the structure defined in \fB<sys/ecppsys.h>\fR must be passed as an 178 argument. 179 .sp 180 The 1284 device ID structure: 181 .sp 182 .in +2 183 .nf 184 struct ecpp_device_id { 185 int mode; /* mode to use for reading device id */ 186 int len; /* length of buffer */ 187 int rlen; /* actual length of device id string */ 188 char *addr; /* buffer address */ 189 }; 190 .fi 191 .in -2 192 193 The mode is the \fIIEEE 1284\fR mode into which the port will be negotiated to 194 retrieve device ID information. If the peripheral or host do not support the 195 mode, \fBEPROTONOSUPPORT\fR is returned. Applications should set mode to 196 \fBECPP_NIBBLE_MODE\fR. \fBlen\fR is the length of the buffer pointed to by 197 \fBaddr\fR. \fBrlen\fR is the actual length of the device ID string returned 198 from the peripheral. If the returned \fBrlen\fR is greater than \fBlen\fR, the 199 application can call \fBECPPIOC_GETDEVID\fR again with a buffer length equal or 200 greater than \fBrlen\fR. Note that the two length bytes of the \fIIEEE 1284\fR 201 device ID are not taken into account and are not returned in the user buffer. 202 .sp 203 After \fBECPPIOC_GETDEVID\fR successfully completes, the driver returns the 204 link to \fBECPP_COMPAT_MODE\fR. The application is responsible for determining 205 the previous mode the link was operating in and returning the link to that 206 mode. 207 .RE 208 209 .sp 210 .ne 2 211 .na 212 \fB\fBBPPIOC_TESTIO\fR\fR 213 .ad 214 .RS 20n 215 Tests the forward transfer readiness of a peripheral operating in Centronics or 216 Compatibility mode. 217 .sp 218 \fBTESTIO\fR determines if the peripheral is ready to receive data by checking 219 the open flags and the Centronics status signals. If the current mode of the 220 device is \fBECPP_NIBBLE_MODE\fR, the driver negotiates the link into 221 \fBECPP_COMPAT_MODE\fR, check the status signals and then return the link to 222 \fBECPP_NIBBLE_MODE\fR mode. If the current mode is \fBECPP_CENTRONICS\fR or 223 \fBECPP_COMPAT_MODE\fR, \fBTESTIO\fR examines the Centronics status signals in 224 the current mode. To receive data, the device must have the \fBnErr\fR and 225 \fBSelect\fR signals asserted and must not have the \fBPE\fR and \fBBusy\fR 226 signals asserted. If \fBecpp\fR is transferring data, \fBTESTIO\fR waits until 227 the previous data sent to the driver is delivered before executing 228 \fBTESTIO\fR. However if an error condition occurs while a \fBTESTIO\fR is 229 waiting, \fBTESTIO\fR returns immediately. If \fBTESTIO\fR determines that the 230 conditions are ok, \fB0\fR is returned. Otherwise, \fB-1\fR is returned, errno 231 is set to \fBEIO\fR and the state of the status pins is captured. The captured 232 status can be retrieved using the \fBBPPIOC_GETERR\fR \fBioctl\fR(2) call. The 233 \fBtimeout_occurred\fR and \fBbus_error\fR fields will never be set by this 234 \fBioctl\fR(2). 235 .RE 236 237 .sp 238 .ne 2 239 .na 240 \fB\fBBPPIOC_GETERR\fR\fR 241 .ad 242 .RS 20n 243 Get last error status. The argument is a pointer to a \fBstruct 244 bpp_error_status\fR defined in \fB<sys/bpp_io.h>\fR header file. The error 245 status structure is: 246 .sp 247 .in +2 248 .nf 249 struct bpp_error_status { 250 char timeout_occurred; /* 1=timeout */ 251 char bus_error; /* not used */ 252 uchar_t pin_status; /* status of pins which 253 /* could cause error */ 254 }; 255 .fi 256 .in -2 257 258 The pin_status field indicates possible error conditions. The valid bits for 259 pin_status are: \fBBPP_ERR_ERR\fR, \fBBPP_SLCT_ERR\fR, \fBBPP_PE_ERR\fR, 260 \fBBPP_BUSY_ERR\fR. A set bit indicates that the associated pin is asserted. 261 .sp 262 This structure indicates the status of all the appropriate status bits at the 263 time of the most recent error condition during a \fBwrite\fR(2) call, or the 264 status of the bits at the most recent \fBBPPIOC_TESTIO\fR \fBioctl\fR(2)call. 265 .sp 266 \fBpin_status\fR indicates possible error conditions under 267 \fBECPP_CENTRONICS\fR or \fBECPP_COMPAT_MODE\fR. Under these modes, the state 268 of the status pins will indicate the state of the device. For instance, many 269 Centronics printers lower the \fBnErr\fR signal when a paper jam occurs. The 270 behavior of the status pins depends on the device. Additional status 271 information may be retrieved through the backchannel. 272 .sp 273 The \fBtimeout_occurred\fR value is set when a timeout occurs during 274 \fBwrite\fR(2). \fBbus_error\fR is not used in this interface. 275 .RE 276 277 .sp 278 .LP 279 The following ioctls are used to directly read and write the parallel port 280 status and control signals. If the current mode of the device is 281 \fBECPP_ECP_MODE\fR or \fBECPP_NIBBLE_MODE\fR, the driver negotiates the link 282 into \fBECPP_COMPAT_MODE\fR, gets or sets the registers and then returns the 283 link to \fBECPP_NIBBLE_MODE\fR. If the current mode is \fBECPP_CENTRONICS\fR or 284 \fBECPP_COMPAT_MODE\fR, these ioctls will get/set the register values in the 285 current mode. 286 .sp 287 .ne 2 288 .na 289 \fB\fBECPPIOC_GETREGS\fR\fR 290 .ad 291 .RS 19n 292 Read register values. The argument is a pointer to a \fBstruct ecpp_regs\fR. 293 See below for a description of this structure. 294 .RE 295 296 .sp 297 .ne 2 298 .na 299 \fB\fBECPPIOC_SETREGS\fR\fR 300 .ad 301 .RS 19n 302 Set \fBecpp\fR register values. The argument is a pointer to a \fBstruct 303 ecpp_regs\fR. See below for a description of this structure. If a parameter is 304 out of range, \fBEINVAL\fR is returned. 305 .sp 306 The Port Register Structure is defined in <\fBsys/ecppio.h\fR>. 307 .sp 308 .in +2 309 .nf 310 struct ecpp_regs { 311 uchar dsr; /* status reg */ 312 u_char dcr; /* control reg */ 313 }; 314 .fi 315 .in -2 316 317 The status register is read-only. The \fBECPPIOC_SETREGS\fR ioctl has no affect 318 on this register. Valid bit values for dsr are: \fBECPP_nERR\fR, 319 \fBECPP_SLCT\fR, \fBECPP_PE\fR, \fBECPP_nACK\fR, \fBECPP_nBUSY\fR. All other 320 bits are reserved and always return \fB1\fR. 321 .sp 322 The control register is read/write. Valid bit values for dcr are: 323 \fBECPP_STB\fR, \fBECPP_AFX\fR, \fBECPP_nINIT\fR, \fBECPP_SLCTIN\fR. All other 324 bits are reserved. Reading reserved bits always return 1. An attempt to write 325 0s into these bits results in \fBEINVAL\fR. 326 .RE 327 328 .SH DEVICE SPECIAL FILES 329 .ne 2 330 .na 331 \fB\fB/dev/lp\fIN\fR\fR\fR 332 .ad 333 .RS 19n 334 x86 only. (Backwards compatibility with former \fBlp\fR(7D) devices.) 335 .RE 336 337 .sp 338 .ne 2 339 .na 340 \fB\fB/dev/printers/\fIN\fR\fR\fR 341 .ad 342 .RS 19n 343 1284 compliant parallel port device special files appears in both namespaces. 344 .RE 345 346 .SH FILES 347 .ne 2 348 .na 349 \fB/kernel/drv/sparcv9/ecpp\fR 350 .ad 351 .sp .6 352 .RS 4n 353 Device driver (SPARC) 354 .RE 355 356 .sp 357 .ne 2 358 .na 359 \fB/kernel/drv/amd64/ecpp\fR 360 .ad 361 .sp .6 362 .RS 4n 363 Device driver (x86) 364 .RE 365 366 .sp 367 .ne 2 368 .na 369 \fB/kernel/drv/ecpp.conf\fR 370 .ad 371 .sp .6 372 .RS 4n 373 Driver configuration file 374 .RE 375 376 .SH ERRORS 377 .ne 2 378 .na 379 \fB\fBEBADF\fR\fR 380 .ad 381 .RS 10n 382 The device is opened for write-only access and a read is attempted, or the 383 device is opened for read-only access and a write is attempted. 384 .RE 385 386 .sp 387 .ne 2 388 .na 389 \fB\fBEBUSY\fR\fR 390 .ad 391 .RS 10n 392 The device has been opened and another open is attempted. An attempt has been 393 made to unload the driver while one of the units is open. 394 .RE 395 396 .sp 397 .ne 2 398 .na 399 \fB\fBEINVAL\fR\fR 400 .ad 401 .RS 10n 402 A \fBECPPIOC_SETPARMS\fR \fBioctl()\fR is attempted with an out-of-range value 403 in the \fBecpp_transfer_parms\fR structure. A \fBECPPIOC_SETREGS\fR 404 \fBioctl()\fR is attempted with an invalid value in the \fBecpp_regs\fR 405 structure. An \fBioctl()\fR is attempted with an invalid value in the command 406 argument.An invalid command argument is received during \fBmodload\fR(1M) or 407 \fBmodunload\fR(1M). 408 .RE 409 410 .sp 411 .ne 2 412 .na 413 \fB\fBEIO\fR\fR 414 .ad 415 .RS 10n 416 The driver encountered a bus error when attempting an access. A read or write 417 did not complete properly, due to a peripheral error or a transfer timeout. 418 .RE 419 420 .sp 421 .ne 2 422 .na 423 \fB\fBENXIO\fR\fR 424 .ad 425 .RS 10n 426 The driver has received an open request for a unit for which the attach failed. 427 The driver has received a write request for a unit which has an active 428 peripheral error. 429 .RE 430 431 .SH ATTRIBUTES 432 See \fBattributes\fR(5) for descriptions of the following attributes: 433 .sp 434 435 .sp 436 .TS 437 box; 438 c | c 439 l | l . 440 ATTRIBUTE TYPE ATTRIBUTE VALUE 441 _ 442 Architecture PCI-based systems 443 _ 444 ISA-based systems (x86) 445 _ 446 Interface stability Evolving 447 .TE 448 449 .SH SEE ALSO 450 \fBmodload\fR(1M), \fBmodunload\fR(1M), \fBupdate_drv\fR(1M), \fBioctl\fR(2), 451 \fBopen\fR(2), \fBread\fR(2), \fBwrite\fR(2), \fBattributes\fR(5), 452 \fBusbprn\fR(7D), \fBprnio\fR(7I), \fBstreamio\fR(7I) 453 .sp 454 .LP 455 \fIIEEE Std 1284-1994\fR 456 .SH DIAGNOSTICS 457 .ne 2 458 .na 459 \fBParallel port controller not supported\fR 460 .ad 461 .sp .6 462 .RS 4n 463 Driver does not support parallel port controller on the given host. Attach 464 failed. 465 .RE --- EOF ---