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1 | /* | |
2 | * IEEE-1284 implementation for parport. | |
3 | * | |
4 | * Authors: Phil Blundell <philb@gnu.org> | |
5 | * Carsten Gross <carsten@sol.wohnheim.uni-ulm.de> | |
6 | * Jose Renau <renau@acm.org> | |
7 | * Tim Waugh <tim@cyberelk.demon.co.uk> (largely rewritten) | |
8 | * | |
9 | * This file is responsible for IEEE 1284 negotiation, and for handing | |
10 | * read/write requests to low-level drivers. | |
11 | * | |
12 | * Any part of this program may be used in documents licensed under | |
13 | * the GNU Free Documentation License, Version 1.1 or any later version | |
14 | * published by the Free Software Foundation. | |
15 | * | |
16 | * Various hacks, Fred Barnes <frmb2@ukc.ac.uk>, 04/2000 | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/threads.h> | |
21 | #include <linux/parport.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/timer.h> | |
26 | #include <linux/sched/signal.h> | |
27 | ||
28 | #undef DEBUG /* undef me for production */ | |
29 | ||
30 | #ifdef CONFIG_LP_CONSOLE | |
31 | #undef DEBUG /* Don't want a garbled console */ | |
32 | #endif | |
33 | ||
34 | #ifdef DEBUG | |
35 | #define DPRINTK(stuff...) printk (stuff) | |
36 | #else | |
37 | #define DPRINTK(stuff...) | |
38 | #endif | |
39 | ||
40 | /* Make parport_wait_peripheral wake up. | |
41 | * It will be useful to call this from an interrupt handler. */ | |
42 | static void parport_ieee1284_wakeup (struct parport *port) | |
43 | { | |
44 | up (&port->physport->ieee1284.irq); | |
45 | } | |
46 | ||
47 | static struct parport *port_from_cookie[PARPORT_MAX]; | |
48 | static void timeout_waiting_on_port (unsigned long cookie) | |
49 | { | |
50 | parport_ieee1284_wakeup (port_from_cookie[cookie % PARPORT_MAX]); | |
51 | } | |
52 | ||
53 | /** | |
54 | * parport_wait_event - wait for an event on a parallel port | |
55 | * @port: port to wait on | |
56 | * @timeout: time to wait (in jiffies) | |
57 | * | |
58 | * This function waits for up to @timeout jiffies for an | |
59 | * interrupt to occur on a parallel port. If the port timeout is | |
60 | * set to zero, it returns immediately. | |
61 | * | |
62 | * If an interrupt occurs before the timeout period elapses, this | |
63 | * function returns zero immediately. If it times out, it returns | |
64 | * one. An error code less than zero indicates an error (most | |
65 | * likely a pending signal), and the calling code should finish | |
66 | * what it's doing as soon as it can. | |
67 | */ | |
68 | ||
69 | int parport_wait_event (struct parport *port, signed long timeout) | |
70 | { | |
71 | int ret; | |
72 | struct timer_list timer; | |
73 | ||
74 | if (!port->physport->cad->timeout) | |
75 | /* Zero timeout is special, and we can't down() the | |
76 | semaphore. */ | |
77 | return 1; | |
78 | ||
79 | init_timer_on_stack(&timer); | |
80 | timer.expires = jiffies + timeout; | |
81 | timer.function = timeout_waiting_on_port; | |
82 | port_from_cookie[port->number % PARPORT_MAX] = port; | |
83 | timer.data = port->number; | |
84 | ||
85 | add_timer (&timer); | |
86 | ret = down_interruptible (&port->physport->ieee1284.irq); | |
87 | if (!del_timer_sync(&timer) && !ret) | |
88 | /* Timed out. */ | |
89 | ret = 1; | |
90 | ||
91 | destroy_timer_on_stack(&timer); | |
92 | ||
93 | return ret; | |
94 | } | |
95 | ||
96 | /** | |
97 | * parport_poll_peripheral - poll status lines | |
98 | * @port: port to watch | |
99 | * @mask: status lines to watch | |
100 | * @result: desired values of chosen status lines | |
101 | * @usec: timeout | |
102 | * | |
103 | * This function busy-waits until the masked status lines have | |
104 | * the desired values, or until the timeout period elapses. The | |
105 | * @mask and @result parameters are bitmasks, with the bits | |
106 | * defined by the constants in parport.h: %PARPORT_STATUS_BUSY, | |
107 | * and so on. | |
108 | * | |
109 | * This function does not call schedule(); instead it busy-waits | |
110 | * using udelay(). It currently has a resolution of 5usec. | |
111 | * | |
112 | * If the status lines take on the desired values before the | |
113 | * timeout period elapses, parport_poll_peripheral() returns zero | |
114 | * immediately. A return value greater than zero indicates | |
115 | * a timeout. An error code (less than zero) indicates an error, | |
116 | * most likely a signal that arrived, and the caller should | |
117 | * finish what it is doing as soon as possible. | |
118 | */ | |
119 | ||
120 | int parport_poll_peripheral(struct parport *port, | |
121 | unsigned char mask, | |
122 | unsigned char result, | |
123 | int usec) | |
124 | { | |
125 | /* Zero return code is success, >0 is timeout. */ | |
126 | int count = usec / 5 + 2; | |
127 | int i; | |
128 | unsigned char status; | |
129 | for (i = 0; i < count; i++) { | |
130 | status = parport_read_status (port); | |
131 | if ((status & mask) == result) | |
132 | return 0; | |
133 | if (signal_pending (current)) | |
134 | return -EINTR; | |
135 | if (need_resched()) | |
136 | break; | |
137 | if (i >= 2) | |
138 | udelay (5); | |
139 | } | |
140 | ||
141 | return 1; | |
142 | } | |
143 | ||
144 | /** | |
145 | * parport_wait_peripheral - wait for status lines to change in 35ms | |
146 | * @port: port to watch | |
147 | * @mask: status lines to watch | |
148 | * @result: desired values of chosen status lines | |
149 | * | |
150 | * This function waits until the masked status lines have the | |
151 | * desired values, or until 35ms have elapsed (see IEEE 1284-1994 | |
152 | * page 24 to 25 for why this value in particular is hardcoded). | |
153 | * The @mask and @result parameters are bitmasks, with the bits | |
154 | * defined by the constants in parport.h: %PARPORT_STATUS_BUSY, | |
155 | * and so on. | |
156 | * | |
157 | * The port is polled quickly to start off with, in anticipation | |
158 | * of a fast response from the peripheral. This fast polling | |
159 | * time is configurable (using /proc), and defaults to 500usec. | |
160 | * If the timeout for this port (see parport_set_timeout()) is | |
161 | * zero, the fast polling time is 35ms, and this function does | |
162 | * not call schedule(). | |
163 | * | |
164 | * If the timeout for this port is non-zero, after the fast | |
165 | * polling fails it uses parport_wait_event() to wait for up to | |
166 | * 10ms, waking up if an interrupt occurs. | |
167 | */ | |
168 | ||
169 | int parport_wait_peripheral(struct parport *port, | |
170 | unsigned char mask, | |
171 | unsigned char result) | |
172 | { | |
173 | int ret; | |
174 | int usec; | |
175 | unsigned long deadline; | |
176 | unsigned char status; | |
177 | ||
178 | usec = port->physport->spintime; /* usecs of fast polling */ | |
179 | if (!port->physport->cad->timeout) | |
180 | /* A zero timeout is "special": busy wait for the | |
181 | entire 35ms. */ | |
182 | usec = 35000; | |
183 | ||
184 | /* Fast polling. | |
185 | * | |
186 | * This should be adjustable. | |
187 | * How about making a note (in the device structure) of how long | |
188 | * it takes, so we know for next time? | |
189 | */ | |
190 | ret = parport_poll_peripheral (port, mask, result, usec); | |
191 | if (ret != 1) | |
192 | return ret; | |
193 | ||
194 | if (!port->physport->cad->timeout) | |
195 | /* We may be in an interrupt handler, so we can't poll | |
196 | * slowly anyway. */ | |
197 | return 1; | |
198 | ||
199 | /* 40ms of slow polling. */ | |
200 | deadline = jiffies + msecs_to_jiffies(40); | |
201 | while (time_before (jiffies, deadline)) { | |
202 | if (signal_pending (current)) | |
203 | return -EINTR; | |
204 | ||
205 | /* Wait for 10ms (or until an interrupt occurs if | |
206 | * the handler is set) */ | |
207 | if ((ret = parport_wait_event (port, msecs_to_jiffies(10))) < 0) | |
208 | return ret; | |
209 | ||
210 | status = parport_read_status (port); | |
211 | if ((status & mask) == result) | |
212 | return 0; | |
213 | ||
214 | if (!ret) { | |
215 | /* parport_wait_event didn't time out, but the | |
216 | * peripheral wasn't actually ready either. | |
217 | * Wait for another 10ms. */ | |
218 | schedule_timeout_interruptible(msecs_to_jiffies(10)); | |
219 | } | |
220 | } | |
221 | ||
222 | return 1; | |
223 | } | |
224 | ||
225 | #ifdef CONFIG_PARPORT_1284 | |
226 | /* Terminate a negotiated mode. */ | |
227 | static void parport_ieee1284_terminate (struct parport *port) | |
228 | { | |
229 | int r; | |
230 | port = port->physport; | |
231 | ||
232 | /* EPP terminates differently. */ | |
233 | switch (port->ieee1284.mode) { | |
234 | case IEEE1284_MODE_EPP: | |
235 | case IEEE1284_MODE_EPPSL: | |
236 | case IEEE1284_MODE_EPPSWE: | |
237 | /* Terminate from EPP mode. */ | |
238 | ||
239 | /* Event 68: Set nInit low */ | |
240 | parport_frob_control (port, PARPORT_CONTROL_INIT, 0); | |
241 | udelay (50); | |
242 | ||
243 | /* Event 69: Set nInit high, nSelectIn low */ | |
244 | parport_frob_control (port, | |
245 | PARPORT_CONTROL_SELECT | |
246 | | PARPORT_CONTROL_INIT, | |
247 | PARPORT_CONTROL_SELECT | |
248 | | PARPORT_CONTROL_INIT); | |
249 | break; | |
250 | ||
251 | case IEEE1284_MODE_ECP: | |
252 | case IEEE1284_MODE_ECPRLE: | |
253 | case IEEE1284_MODE_ECPSWE: | |
254 | /* In ECP we can only terminate from fwd idle phase. */ | |
255 | if (port->ieee1284.phase != IEEE1284_PH_FWD_IDLE) { | |
256 | /* Event 47: Set nInit high */ | |
257 | parport_frob_control (port, | |
258 | PARPORT_CONTROL_INIT | |
259 | | PARPORT_CONTROL_AUTOFD, | |
260 | PARPORT_CONTROL_INIT | |
261 | | PARPORT_CONTROL_AUTOFD); | |
262 | ||
263 | /* Event 49: PError goes high */ | |
264 | r = parport_wait_peripheral (port, | |
265 | PARPORT_STATUS_PAPEROUT, | |
266 | PARPORT_STATUS_PAPEROUT); | |
267 | if (r) | |
268 | DPRINTK (KERN_INFO "%s: Timeout at event 49\n", | |
269 | port->name); | |
270 | ||
271 | parport_data_forward (port); | |
272 | DPRINTK (KERN_DEBUG "%s: ECP direction: forward\n", | |
273 | port->name); | |
274 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; | |
275 | } | |
276 | ||
277 | /* fall-though.. */ | |
278 | ||
279 | default: | |
280 | /* Terminate from all other modes. */ | |
281 | ||
282 | /* Event 22: Set nSelectIn low, nAutoFd high */ | |
283 | parport_frob_control (port, | |
284 | PARPORT_CONTROL_SELECT | |
285 | | PARPORT_CONTROL_AUTOFD, | |
286 | PARPORT_CONTROL_SELECT); | |
287 | ||
288 | /* Event 24: nAck goes low */ | |
289 | r = parport_wait_peripheral (port, PARPORT_STATUS_ACK, 0); | |
290 | if (r) | |
291 | DPRINTK (KERN_INFO "%s: Timeout at event 24\n", | |
292 | port->name); | |
293 | ||
294 | /* Event 25: Set nAutoFd low */ | |
295 | parport_frob_control (port, | |
296 | PARPORT_CONTROL_AUTOFD, | |
297 | PARPORT_CONTROL_AUTOFD); | |
298 | ||
299 | /* Event 27: nAck goes high */ | |
300 | r = parport_wait_peripheral (port, | |
301 | PARPORT_STATUS_ACK, | |
302 | PARPORT_STATUS_ACK); | |
303 | if (r) | |
304 | DPRINTK (KERN_INFO "%s: Timeout at event 27\n", | |
305 | port->name); | |
306 | ||
307 | /* Event 29: Set nAutoFd high */ | |
308 | parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0); | |
309 | } | |
310 | ||
311 | port->ieee1284.mode = IEEE1284_MODE_COMPAT; | |
312 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; | |
313 | ||
314 | DPRINTK (KERN_DEBUG "%s: In compatibility (forward idle) mode\n", | |
315 | port->name); | |
316 | } | |
317 | #endif /* IEEE1284 support */ | |
318 | ||
319 | /** | |
320 | * parport_negotiate - negotiate an IEEE 1284 mode | |
321 | * @port: port to use | |
322 | * @mode: mode to negotiate to | |
323 | * | |
324 | * Use this to negotiate to a particular IEEE 1284 transfer mode. | |
325 | * The @mode parameter should be one of the constants in | |
326 | * parport.h starting %IEEE1284_MODE_xxx. | |
327 | * | |
328 | * The return value is 0 if the peripheral has accepted the | |
329 | * negotiation to the mode specified, -1 if the peripheral is not | |
330 | * IEEE 1284 compliant (or not present), or 1 if the peripheral | |
331 | * has rejected the negotiation. | |
332 | */ | |
333 | ||
334 | int parport_negotiate (struct parport *port, int mode) | |
335 | { | |
336 | #ifndef CONFIG_PARPORT_1284 | |
337 | if (mode == IEEE1284_MODE_COMPAT) | |
338 | return 0; | |
339 | printk (KERN_ERR "parport: IEEE1284 not supported in this kernel\n"); | |
340 | return -1; | |
341 | #else | |
342 | int m = mode & ~IEEE1284_ADDR; | |
343 | int r; | |
344 | unsigned char xflag; | |
345 | ||
346 | port = port->physport; | |
347 | ||
348 | /* Is there anything to do? */ | |
349 | if (port->ieee1284.mode == mode) | |
350 | return 0; | |
351 | ||
352 | /* Is the difference just an address-or-not bit? */ | |
353 | if ((port->ieee1284.mode & ~IEEE1284_ADDR) == (mode & ~IEEE1284_ADDR)){ | |
354 | port->ieee1284.mode = mode; | |
355 | return 0; | |
356 | } | |
357 | ||
358 | /* Go to compatibility forward idle mode */ | |
359 | if (port->ieee1284.mode != IEEE1284_MODE_COMPAT) | |
360 | parport_ieee1284_terminate (port); | |
361 | ||
362 | if (mode == IEEE1284_MODE_COMPAT) | |
363 | /* Compatibility mode: no negotiation. */ | |
364 | return 0; | |
365 | ||
366 | switch (mode) { | |
367 | case IEEE1284_MODE_ECPSWE: | |
368 | m = IEEE1284_MODE_ECP; | |
369 | break; | |
370 | case IEEE1284_MODE_EPPSL: | |
371 | case IEEE1284_MODE_EPPSWE: | |
372 | m = IEEE1284_MODE_EPP; | |
373 | break; | |
374 | case IEEE1284_MODE_BECP: | |
375 | return -ENOSYS; /* FIXME (implement BECP) */ | |
376 | } | |
377 | ||
378 | if (mode & IEEE1284_EXT_LINK) | |
379 | m = 1<<7; /* request extensibility link */ | |
380 | ||
381 | port->ieee1284.phase = IEEE1284_PH_NEGOTIATION; | |
382 | ||
383 | /* Start off with nStrobe and nAutoFd high, and nSelectIn low */ | |
384 | parport_frob_control (port, | |
385 | PARPORT_CONTROL_STROBE | |
386 | | PARPORT_CONTROL_AUTOFD | |
387 | | PARPORT_CONTROL_SELECT, | |
388 | PARPORT_CONTROL_SELECT); | |
389 | udelay(1); | |
390 | ||
391 | /* Event 0: Set data */ | |
392 | parport_data_forward (port); | |
393 | parport_write_data (port, m); | |
394 | udelay (400); /* Shouldn't need to wait this long. */ | |
395 | ||
396 | /* Event 1: Set nSelectIn high, nAutoFd low */ | |
397 | parport_frob_control (port, | |
398 | PARPORT_CONTROL_SELECT | |
399 | | PARPORT_CONTROL_AUTOFD, | |
400 | PARPORT_CONTROL_AUTOFD); | |
401 | ||
402 | /* Event 2: PError, Select, nFault go high, nAck goes low */ | |
403 | if (parport_wait_peripheral (port, | |
404 | PARPORT_STATUS_ERROR | |
405 | | PARPORT_STATUS_SELECT | |
406 | | PARPORT_STATUS_PAPEROUT | |
407 | | PARPORT_STATUS_ACK, | |
408 | PARPORT_STATUS_ERROR | |
409 | | PARPORT_STATUS_SELECT | |
410 | | PARPORT_STATUS_PAPEROUT)) { | |
411 | /* Timeout */ | |
412 | parport_frob_control (port, | |
413 | PARPORT_CONTROL_SELECT | |
414 | | PARPORT_CONTROL_AUTOFD, | |
415 | PARPORT_CONTROL_SELECT); | |
416 | DPRINTK (KERN_DEBUG | |
417 | "%s: Peripheral not IEEE1284 compliant (0x%02X)\n", | |
418 | port->name, parport_read_status (port)); | |
419 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; | |
420 | return -1; /* Not IEEE1284 compliant */ | |
421 | } | |
422 | ||
423 | /* Event 3: Set nStrobe low */ | |
424 | parport_frob_control (port, | |
425 | PARPORT_CONTROL_STROBE, | |
426 | PARPORT_CONTROL_STROBE); | |
427 | ||
428 | /* Event 4: Set nStrobe and nAutoFd high */ | |
429 | udelay (5); | |
430 | parport_frob_control (port, | |
431 | PARPORT_CONTROL_STROBE | |
432 | | PARPORT_CONTROL_AUTOFD, | |
433 | 0); | |
434 | ||
435 | /* Event 6: nAck goes high */ | |
436 | if (parport_wait_peripheral (port, | |
437 | PARPORT_STATUS_ACK, | |
438 | PARPORT_STATUS_ACK)) { | |
439 | /* This shouldn't really happen with a compliant device. */ | |
440 | DPRINTK (KERN_DEBUG | |
441 | "%s: Mode 0x%02x not supported? (0x%02x)\n", | |
442 | port->name, mode, port->ops->read_status (port)); | |
443 | parport_ieee1284_terminate (port); | |
444 | return 1; | |
445 | } | |
446 | ||
447 | xflag = parport_read_status (port) & PARPORT_STATUS_SELECT; | |
448 | ||
449 | /* xflag should be high for all modes other than nibble (0). */ | |
450 | if (mode && !xflag) { | |
451 | /* Mode not supported. */ | |
452 | DPRINTK (KERN_DEBUG "%s: Mode 0x%02x rejected by peripheral\n", | |
453 | port->name, mode); | |
454 | parport_ieee1284_terminate (port); | |
455 | return 1; | |
456 | } | |
457 | ||
458 | /* More to do if we've requested extensibility link. */ | |
459 | if (mode & IEEE1284_EXT_LINK) { | |
460 | m = mode & 0x7f; | |
461 | udelay (1); | |
462 | parport_write_data (port, m); | |
463 | udelay (1); | |
464 | ||
465 | /* Event 51: Set nStrobe low */ | |
466 | parport_frob_control (port, | |
467 | PARPORT_CONTROL_STROBE, | |
468 | PARPORT_CONTROL_STROBE); | |
469 | ||
470 | /* Event 52: nAck goes low */ | |
471 | if (parport_wait_peripheral (port, PARPORT_STATUS_ACK, 0)) { | |
472 | /* This peripheral is _very_ slow. */ | |
473 | DPRINTK (KERN_DEBUG | |
474 | "%s: Event 52 didn't happen\n", | |
475 | port->name); | |
476 | parport_ieee1284_terminate (port); | |
477 | return 1; | |
478 | } | |
479 | ||
480 | /* Event 53: Set nStrobe high */ | |
481 | parport_frob_control (port, | |
482 | PARPORT_CONTROL_STROBE, | |
483 | 0); | |
484 | ||
485 | /* Event 55: nAck goes high */ | |
486 | if (parport_wait_peripheral (port, | |
487 | PARPORT_STATUS_ACK, | |
488 | PARPORT_STATUS_ACK)) { | |
489 | /* This shouldn't really happen with a compliant | |
490 | * device. */ | |
491 | DPRINTK (KERN_DEBUG | |
492 | "%s: Mode 0x%02x not supported? (0x%02x)\n", | |
493 | port->name, mode, | |
494 | port->ops->read_status (port)); | |
495 | parport_ieee1284_terminate (port); | |
496 | return 1; | |
497 | } | |
498 | ||
499 | /* Event 54: Peripheral sets XFlag to reflect support */ | |
500 | xflag = parport_read_status (port) & PARPORT_STATUS_SELECT; | |
501 | ||
502 | /* xflag should be high. */ | |
503 | if (!xflag) { | |
504 | /* Extended mode not supported. */ | |
505 | DPRINTK (KERN_DEBUG "%s: Extended mode 0x%02x not " | |
506 | "supported\n", port->name, mode); | |
507 | parport_ieee1284_terminate (port); | |
508 | return 1; | |
509 | } | |
510 | ||
511 | /* Any further setup is left to the caller. */ | |
512 | } | |
513 | ||
514 | /* Mode is supported */ | |
515 | DPRINTK (KERN_DEBUG "%s: In mode 0x%02x\n", port->name, mode); | |
516 | port->ieee1284.mode = mode; | |
517 | ||
518 | /* But ECP is special */ | |
519 | if (!(mode & IEEE1284_EXT_LINK) && (m & IEEE1284_MODE_ECP)) { | |
520 | port->ieee1284.phase = IEEE1284_PH_ECP_SETUP; | |
521 | ||
522 | /* Event 30: Set nAutoFd low */ | |
523 | parport_frob_control (port, | |
524 | PARPORT_CONTROL_AUTOFD, | |
525 | PARPORT_CONTROL_AUTOFD); | |
526 | ||
527 | /* Event 31: PError goes high. */ | |
528 | r = parport_wait_peripheral (port, | |
529 | PARPORT_STATUS_PAPEROUT, | |
530 | PARPORT_STATUS_PAPEROUT); | |
531 | if (r) { | |
532 | DPRINTK (KERN_INFO "%s: Timeout at event 31\n", | |
533 | port->name); | |
534 | } | |
535 | ||
536 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; | |
537 | DPRINTK (KERN_DEBUG "%s: ECP direction: forward\n", | |
538 | port->name); | |
539 | } else switch (mode) { | |
540 | case IEEE1284_MODE_NIBBLE: | |
541 | case IEEE1284_MODE_BYTE: | |
542 | port->ieee1284.phase = IEEE1284_PH_REV_IDLE; | |
543 | break; | |
544 | default: | |
545 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; | |
546 | } | |
547 | ||
548 | ||
549 | return 0; | |
550 | #endif /* IEEE1284 support */ | |
551 | } | |
552 | ||
553 | /* Acknowledge that the peripheral has data available. | |
554 | * Events 18-20, in order to get from Reverse Idle phase | |
555 | * to Host Busy Data Available. | |
556 | * This will most likely be called from an interrupt. | |
557 | * Returns zero if data was available. | |
558 | */ | |
559 | #ifdef CONFIG_PARPORT_1284 | |
560 | static int parport_ieee1284_ack_data_avail (struct parport *port) | |
561 | { | |
562 | if (parport_read_status (port) & PARPORT_STATUS_ERROR) | |
563 | /* Event 18 didn't happen. */ | |
564 | return -1; | |
565 | ||
566 | /* Event 20: nAutoFd goes high. */ | |
567 | port->ops->frob_control (port, PARPORT_CONTROL_AUTOFD, 0); | |
568 | port->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL; | |
569 | return 0; | |
570 | } | |
571 | #endif /* IEEE1284 support */ | |
572 | ||
573 | /* Handle an interrupt. */ | |
574 | void parport_ieee1284_interrupt (void *handle) | |
575 | { | |
576 | struct parport *port = handle; | |
577 | parport_ieee1284_wakeup (port); | |
578 | ||
579 | #ifdef CONFIG_PARPORT_1284 | |
580 | if (port->ieee1284.phase == IEEE1284_PH_REV_IDLE) { | |
581 | /* An interrupt in this phase means that data | |
582 | * is now available. */ | |
583 | DPRINTK (KERN_DEBUG "%s: Data available\n", port->name); | |
584 | parport_ieee1284_ack_data_avail (port); | |
585 | } | |
586 | #endif /* IEEE1284 support */ | |
587 | } | |
588 | ||
589 | /** | |
590 | * parport_write - write a block of data to a parallel port | |
591 | * @port: port to write to | |
592 | * @buffer: data buffer (in kernel space) | |
593 | * @len: number of bytes of data to transfer | |
594 | * | |
595 | * This will write up to @len bytes of @buffer to the port | |
596 | * specified, using the IEEE 1284 transfer mode most recently | |
597 | * negotiated to (using parport_negotiate()), as long as that | |
598 | * mode supports forward transfers (host to peripheral). | |
599 | * | |
600 | * It is the caller's responsibility to ensure that the first | |
601 | * @len bytes of @buffer are valid. | |
602 | * | |
603 | * This function returns the number of bytes transferred (if zero | |
604 | * or positive), or else an error code. | |
605 | */ | |
606 | ||
607 | ssize_t parport_write (struct parport *port, const void *buffer, size_t len) | |
608 | { | |
609 | #ifndef CONFIG_PARPORT_1284 | |
610 | return port->ops->compat_write_data (port, buffer, len, 0); | |
611 | #else | |
612 | ssize_t retval; | |
613 | int mode = port->ieee1284.mode; | |
614 | int addr = mode & IEEE1284_ADDR; | |
615 | size_t (*fn) (struct parport *, const void *, size_t, int); | |
616 | ||
617 | /* Ignore the device-ID-request bit and the address bit. */ | |
618 | mode &= ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
619 | ||
620 | /* Use the mode we're in. */ | |
621 | switch (mode) { | |
622 | case IEEE1284_MODE_NIBBLE: | |
623 | case IEEE1284_MODE_BYTE: | |
624 | parport_negotiate (port, IEEE1284_MODE_COMPAT); | |
625 | case IEEE1284_MODE_COMPAT: | |
626 | DPRINTK (KERN_DEBUG "%s: Using compatibility mode\n", | |
627 | port->name); | |
628 | fn = port->ops->compat_write_data; | |
629 | break; | |
630 | ||
631 | case IEEE1284_MODE_EPP: | |
632 | DPRINTK (KERN_DEBUG "%s: Using EPP mode\n", port->name); | |
633 | if (addr) { | |
634 | fn = port->ops->epp_write_addr; | |
635 | } else { | |
636 | fn = port->ops->epp_write_data; | |
637 | } | |
638 | break; | |
639 | case IEEE1284_MODE_EPPSWE: | |
640 | DPRINTK (KERN_DEBUG "%s: Using software-emulated EPP mode\n", | |
641 | port->name); | |
642 | if (addr) { | |
643 | fn = parport_ieee1284_epp_write_addr; | |
644 | } else { | |
645 | fn = parport_ieee1284_epp_write_data; | |
646 | } | |
647 | break; | |
648 | case IEEE1284_MODE_ECP: | |
649 | case IEEE1284_MODE_ECPRLE: | |
650 | DPRINTK (KERN_DEBUG "%s: Using ECP mode\n", port->name); | |
651 | if (addr) { | |
652 | fn = port->ops->ecp_write_addr; | |
653 | } else { | |
654 | fn = port->ops->ecp_write_data; | |
655 | } | |
656 | break; | |
657 | ||
658 | case IEEE1284_MODE_ECPSWE: | |
659 | DPRINTK (KERN_DEBUG "%s: Using software-emulated ECP mode\n", | |
660 | port->name); | |
661 | /* The caller has specified that it must be emulated, | |
662 | * even if we have ECP hardware! */ | |
663 | if (addr) { | |
664 | fn = parport_ieee1284_ecp_write_addr; | |
665 | } else { | |
666 | fn = parport_ieee1284_ecp_write_data; | |
667 | } | |
668 | break; | |
669 | ||
670 | default: | |
671 | DPRINTK (KERN_DEBUG "%s: Unknown mode 0x%02x\n", port->name, | |
672 | port->ieee1284.mode); | |
673 | return -ENOSYS; | |
674 | } | |
675 | ||
676 | retval = (*fn) (port, buffer, len, 0); | |
677 | DPRINTK (KERN_DEBUG "%s: wrote %d/%d bytes\n", port->name, retval, len); | |
678 | return retval; | |
679 | #endif /* IEEE1284 support */ | |
680 | } | |
681 | ||
682 | /** | |
683 | * parport_read - read a block of data from a parallel port | |
684 | * @port: port to read from | |
685 | * @buffer: data buffer (in kernel space) | |
686 | * @len: number of bytes of data to transfer | |
687 | * | |
688 | * This will read up to @len bytes of @buffer to the port | |
689 | * specified, using the IEEE 1284 transfer mode most recently | |
690 | * negotiated to (using parport_negotiate()), as long as that | |
691 | * mode supports reverse transfers (peripheral to host). | |
692 | * | |
693 | * It is the caller's responsibility to ensure that the first | |
694 | * @len bytes of @buffer are available to write to. | |
695 | * | |
696 | * This function returns the number of bytes transferred (if zero | |
697 | * or positive), or else an error code. | |
698 | */ | |
699 | ||
700 | ssize_t parport_read (struct parport *port, void *buffer, size_t len) | |
701 | { | |
702 | #ifndef CONFIG_PARPORT_1284 | |
703 | printk (KERN_ERR "parport: IEEE1284 not supported in this kernel\n"); | |
704 | return -ENODEV; | |
705 | #else | |
706 | int mode = port->physport->ieee1284.mode; | |
707 | int addr = mode & IEEE1284_ADDR; | |
708 | size_t (*fn) (struct parport *, void *, size_t, int); | |
709 | ||
710 | /* Ignore the device-ID-request bit and the address bit. */ | |
711 | mode &= ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
712 | ||
713 | /* Use the mode we're in. */ | |
714 | switch (mode) { | |
715 | case IEEE1284_MODE_COMPAT: | |
716 | /* if we can tri-state use BYTE mode instead of NIBBLE mode, | |
717 | * if that fails, revert to NIBBLE mode -- ought to store somewhere | |
718 | * the device's ability to do BYTE mode reverse transfers, so we don't | |
719 | * end up needlessly calling negotiate(BYTE) repeately.. (fb) | |
720 | */ | |
721 | if ((port->physport->modes & PARPORT_MODE_TRISTATE) && | |
722 | !parport_negotiate (port, IEEE1284_MODE_BYTE)) { | |
723 | /* got into BYTE mode OK */ | |
724 | DPRINTK (KERN_DEBUG "%s: Using byte mode\n", port->name); | |
725 | fn = port->ops->byte_read_data; | |
726 | break; | |
727 | } | |
728 | if (parport_negotiate (port, IEEE1284_MODE_NIBBLE)) { | |
729 | return -EIO; | |
730 | } | |
731 | /* fall through to NIBBLE */ | |
732 | case IEEE1284_MODE_NIBBLE: | |
733 | DPRINTK (KERN_DEBUG "%s: Using nibble mode\n", port->name); | |
734 | fn = port->ops->nibble_read_data; | |
735 | break; | |
736 | ||
737 | case IEEE1284_MODE_BYTE: | |
738 | DPRINTK (KERN_DEBUG "%s: Using byte mode\n", port->name); | |
739 | fn = port->ops->byte_read_data; | |
740 | break; | |
741 | ||
742 | case IEEE1284_MODE_EPP: | |
743 | DPRINTK (KERN_DEBUG "%s: Using EPP mode\n", port->name); | |
744 | if (addr) { | |
745 | fn = port->ops->epp_read_addr; | |
746 | } else { | |
747 | fn = port->ops->epp_read_data; | |
748 | } | |
749 | break; | |
750 | case IEEE1284_MODE_EPPSWE: | |
751 | DPRINTK (KERN_DEBUG "%s: Using software-emulated EPP mode\n", | |
752 | port->name); | |
753 | if (addr) { | |
754 | fn = parport_ieee1284_epp_read_addr; | |
755 | } else { | |
756 | fn = parport_ieee1284_epp_read_data; | |
757 | } | |
758 | break; | |
759 | case IEEE1284_MODE_ECP: | |
760 | case IEEE1284_MODE_ECPRLE: | |
761 | DPRINTK (KERN_DEBUG "%s: Using ECP mode\n", port->name); | |
762 | fn = port->ops->ecp_read_data; | |
763 | break; | |
764 | ||
765 | case IEEE1284_MODE_ECPSWE: | |
766 | DPRINTK (KERN_DEBUG "%s: Using software-emulated ECP mode\n", | |
767 | port->name); | |
768 | fn = parport_ieee1284_ecp_read_data; | |
769 | break; | |
770 | ||
771 | default: | |
772 | DPRINTK (KERN_DEBUG "%s: Unknown mode 0x%02x\n", port->name, | |
773 | port->physport->ieee1284.mode); | |
774 | return -ENOSYS; | |
775 | } | |
776 | ||
777 | return (*fn) (port, buffer, len, 0); | |
778 | #endif /* IEEE1284 support */ | |
779 | } | |
780 | ||
781 | /** | |
782 | * parport_set_timeout - set the inactivity timeout for a device | |
783 | * @dev: device on a port | |
784 | * @inactivity: inactivity timeout (in jiffies) | |
785 | * | |
786 | * This sets the inactivity timeout for a particular device on a | |
787 | * port. This affects functions like parport_wait_peripheral(). | |
788 | * The special value 0 means not to call schedule() while dealing | |
789 | * with this device. | |
790 | * | |
791 | * The return value is the previous inactivity timeout. | |
792 | * | |
793 | * Any callers of parport_wait_event() for this device are woken | |
794 | * up. | |
795 | */ | |
796 | ||
797 | long parport_set_timeout (struct pardevice *dev, long inactivity) | |
798 | { | |
799 | long int old = dev->timeout; | |
800 | ||
801 | dev->timeout = inactivity; | |
802 | ||
803 | if (dev->port->physport->cad == dev) | |
804 | parport_ieee1284_wakeup (dev->port); | |
805 | ||
806 | return old; | |
807 | } | |
808 | ||
809 | /* Exported symbols for modules. */ | |
810 | ||
811 | EXPORT_SYMBOL(parport_negotiate); | |
812 | EXPORT_SYMBOL(parport_write); | |
813 | EXPORT_SYMBOL(parport_read); | |
814 | EXPORT_SYMBOL(parport_wait_peripheral); | |
815 | EXPORT_SYMBOL(parport_wait_event); | |
816 | EXPORT_SYMBOL(parport_set_timeout); | |
817 | EXPORT_SYMBOL(parport_ieee1284_interrupt); |