Commit | Line | Data |
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612de10d | 1 | /* |
1da177e4 LT |
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 | ||
1da177e4 LT |
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> | |
174cd4b1 | 26 | #include <linux/sched/signal.h> |
1da177e4 LT |
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 | ||
9c6c273a | 47 | static void timeout_waiting_on_port (struct timer_list *t) |
1da177e4 | 48 | { |
9c6c273a KC |
49 | struct parport *port = from_timer(port, t, timer); |
50 | ||
51 | parport_ieee1284_wakeup (port); | |
1da177e4 LT |
52 | } |
53 | ||
54 | /** | |
55 | * parport_wait_event - wait for an event on a parallel port | |
56 | * @port: port to wait on | |
57 | * @timeout: time to wait (in jiffies) | |
58 | * | |
59 | * This function waits for up to @timeout jiffies for an | |
60 | * interrupt to occur on a parallel port. If the port timeout is | |
61 | * set to zero, it returns immediately. | |
62 | * | |
63 | * If an interrupt occurs before the timeout period elapses, this | |
0ef3b49c AG |
64 | * function returns zero immediately. If it times out, it returns |
65 | * one. An error code less than zero indicates an error (most | |
66 | * likely a pending signal), and the calling code should finish | |
67 | * what it's doing as soon as it can. | |
1da177e4 LT |
68 | */ |
69 | ||
70 | int parport_wait_event (struct parport *port, signed long timeout) | |
71 | { | |
72 | int ret; | |
1da177e4 LT |
73 | |
74 | if (!port->physport->cad->timeout) | |
75 | /* Zero timeout is special, and we can't down() the | |
76 | semaphore. */ | |
77 | return 1; | |
78 | ||
9c6c273a KC |
79 | timer_setup(&port->timer, timeout_waiting_on_port, 0); |
80 | mod_timer(&port->timer, jiffies + timeout); | |
1da177e4 | 81 | ret = down_interruptible (&port->physport->ieee1284.irq); |
9c6c273a | 82 | if (!del_timer_sync(&port->timer) && !ret) |
1da177e4 LT |
83 | /* Timed out. */ |
84 | ret = 1; | |
85 | ||
86 | return ret; | |
87 | } | |
88 | ||
89 | /** | |
90 | * parport_poll_peripheral - poll status lines | |
91 | * @port: port to watch | |
92 | * @mask: status lines to watch | |
93 | * @result: desired values of chosen status lines | |
94 | * @usec: timeout | |
95 | * | |
96 | * This function busy-waits until the masked status lines have | |
97 | * the desired values, or until the timeout period elapses. The | |
98 | * @mask and @result parameters are bitmasks, with the bits | |
99 | * defined by the constants in parport.h: %PARPORT_STATUS_BUSY, | |
100 | * and so on. | |
101 | * | |
102 | * This function does not call schedule(); instead it busy-waits | |
103 | * using udelay(). It currently has a resolution of 5usec. | |
104 | * | |
105 | * If the status lines take on the desired values before the | |
106 | * timeout period elapses, parport_poll_peripheral() returns zero | |
0ef3b49c | 107 | * immediately. A return value greater than zero indicates |
1da177e4 LT |
108 | * a timeout. An error code (less than zero) indicates an error, |
109 | * most likely a signal that arrived, and the caller should | |
110 | * finish what it is doing as soon as possible. | |
111 | */ | |
112 | ||
113 | int parport_poll_peripheral(struct parport *port, | |
114 | unsigned char mask, | |
115 | unsigned char result, | |
116 | int usec) | |
117 | { | |
118 | /* Zero return code is success, >0 is timeout. */ | |
119 | int count = usec / 5 + 2; | |
120 | int i; | |
121 | unsigned char status; | |
122 | for (i = 0; i < count; i++) { | |
123 | status = parport_read_status (port); | |
124 | if ((status & mask) == result) | |
125 | return 0; | |
126 | if (signal_pending (current)) | |
127 | return -EINTR; | |
128 | if (need_resched()) | |
129 | break; | |
130 | if (i >= 2) | |
131 | udelay (5); | |
132 | } | |
133 | ||
134 | return 1; | |
135 | } | |
136 | ||
137 | /** | |
138 | * parport_wait_peripheral - wait for status lines to change in 35ms | |
139 | * @port: port to watch | |
140 | * @mask: status lines to watch | |
141 | * @result: desired values of chosen status lines | |
142 | * | |
143 | * This function waits until the masked status lines have the | |
144 | * desired values, or until 35ms have elapsed (see IEEE 1284-1994 | |
145 | * page 24 to 25 for why this value in particular is hardcoded). | |
146 | * The @mask and @result parameters are bitmasks, with the bits | |
147 | * defined by the constants in parport.h: %PARPORT_STATUS_BUSY, | |
148 | * and so on. | |
149 | * | |
150 | * The port is polled quickly to start off with, in anticipation | |
151 | * of a fast response from the peripheral. This fast polling | |
152 | * time is configurable (using /proc), and defaults to 500usec. | |
153 | * If the timeout for this port (see parport_set_timeout()) is | |
154 | * zero, the fast polling time is 35ms, and this function does | |
155 | * not call schedule(). | |
156 | * | |
157 | * If the timeout for this port is non-zero, after the fast | |
158 | * polling fails it uses parport_wait_event() to wait for up to | |
159 | * 10ms, waking up if an interrupt occurs. | |
160 | */ | |
161 | ||
162 | int parport_wait_peripheral(struct parport *port, | |
163 | unsigned char mask, | |
164 | unsigned char result) | |
165 | { | |
166 | int ret; | |
167 | int usec; | |
168 | unsigned long deadline; | |
169 | unsigned char status; | |
170 | ||
171 | usec = port->physport->spintime; /* usecs of fast polling */ | |
172 | if (!port->physport->cad->timeout) | |
173 | /* A zero timeout is "special": busy wait for the | |
174 | entire 35ms. */ | |
175 | usec = 35000; | |
176 | ||
177 | /* Fast polling. | |
178 | * | |
179 | * This should be adjustable. | |
180 | * How about making a note (in the device structure) of how long | |
181 | * it takes, so we know for next time? | |
182 | */ | |
183 | ret = parport_poll_peripheral (port, mask, result, usec); | |
184 | if (ret != 1) | |
185 | return ret; | |
186 | ||
187 | if (!port->physport->cad->timeout) | |
188 | /* We may be in an interrupt handler, so we can't poll | |
189 | * slowly anyway. */ | |
190 | return 1; | |
191 | ||
192 | /* 40ms of slow polling. */ | |
7b4ccf8d | 193 | deadline = jiffies + msecs_to_jiffies(40); |
1da177e4 | 194 | while (time_before (jiffies, deadline)) { |
1da177e4 LT |
195 | if (signal_pending (current)) |
196 | return -EINTR; | |
197 | ||
198 | /* Wait for 10ms (or until an interrupt occurs if | |
199 | * the handler is set) */ | |
7b4ccf8d | 200 | if ((ret = parport_wait_event (port, msecs_to_jiffies(10))) < 0) |
1da177e4 LT |
201 | return ret; |
202 | ||
203 | status = parport_read_status (port); | |
204 | if ((status & mask) == result) | |
205 | return 0; | |
206 | ||
207 | if (!ret) { | |
208 | /* parport_wait_event didn't time out, but the | |
209 | * peripheral wasn't actually ready either. | |
210 | * Wait for another 10ms. */ | |
7b4ccf8d | 211 | schedule_timeout_interruptible(msecs_to_jiffies(10)); |
1da177e4 LT |
212 | } |
213 | } | |
214 | ||
215 | return 1; | |
216 | } | |
217 | ||
218 | #ifdef CONFIG_PARPORT_1284 | |
219 | /* Terminate a negotiated mode. */ | |
220 | static void parport_ieee1284_terminate (struct parport *port) | |
221 | { | |
222 | int r; | |
223 | port = port->physport; | |
224 | ||
225 | /* EPP terminates differently. */ | |
226 | switch (port->ieee1284.mode) { | |
227 | case IEEE1284_MODE_EPP: | |
228 | case IEEE1284_MODE_EPPSL: | |
229 | case IEEE1284_MODE_EPPSWE: | |
230 | /* Terminate from EPP mode. */ | |
231 | ||
232 | /* Event 68: Set nInit low */ | |
233 | parport_frob_control (port, PARPORT_CONTROL_INIT, 0); | |
234 | udelay (50); | |
235 | ||
236 | /* Event 69: Set nInit high, nSelectIn low */ | |
237 | parport_frob_control (port, | |
238 | PARPORT_CONTROL_SELECT | |
239 | | PARPORT_CONTROL_INIT, | |
240 | PARPORT_CONTROL_SELECT | |
241 | | PARPORT_CONTROL_INIT); | |
242 | break; | |
243 | ||
244 | case IEEE1284_MODE_ECP: | |
245 | case IEEE1284_MODE_ECPRLE: | |
246 | case IEEE1284_MODE_ECPSWE: | |
247 | /* In ECP we can only terminate from fwd idle phase. */ | |
248 | if (port->ieee1284.phase != IEEE1284_PH_FWD_IDLE) { | |
249 | /* Event 47: Set nInit high */ | |
250 | parport_frob_control (port, | |
251 | PARPORT_CONTROL_INIT | |
252 | | PARPORT_CONTROL_AUTOFD, | |
253 | PARPORT_CONTROL_INIT | |
254 | | PARPORT_CONTROL_AUTOFD); | |
255 | ||
256 | /* Event 49: PError goes high */ | |
257 | r = parport_wait_peripheral (port, | |
258 | PARPORT_STATUS_PAPEROUT, | |
259 | PARPORT_STATUS_PAPEROUT); | |
260 | if (r) | |
261 | DPRINTK (KERN_INFO "%s: Timeout at event 49\n", | |
262 | port->name); | |
263 | ||
264 | parport_data_forward (port); | |
265 | DPRINTK (KERN_DEBUG "%s: ECP direction: forward\n", | |
266 | port->name); | |
267 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; | |
268 | } | |
269 | ||
270 | /* fall-though.. */ | |
271 | ||
272 | default: | |
273 | /* Terminate from all other modes. */ | |
274 | ||
275 | /* Event 22: Set nSelectIn low, nAutoFd high */ | |
276 | parport_frob_control (port, | |
277 | PARPORT_CONTROL_SELECT | |
278 | | PARPORT_CONTROL_AUTOFD, | |
279 | PARPORT_CONTROL_SELECT); | |
280 | ||
281 | /* Event 24: nAck goes low */ | |
282 | r = parport_wait_peripheral (port, PARPORT_STATUS_ACK, 0); | |
283 | if (r) | |
284 | DPRINTK (KERN_INFO "%s: Timeout at event 24\n", | |
285 | port->name); | |
286 | ||
287 | /* Event 25: Set nAutoFd low */ | |
288 | parport_frob_control (port, | |
289 | PARPORT_CONTROL_AUTOFD, | |
290 | PARPORT_CONTROL_AUTOFD); | |
291 | ||
292 | /* Event 27: nAck goes high */ | |
293 | r = parport_wait_peripheral (port, | |
294 | PARPORT_STATUS_ACK, | |
295 | PARPORT_STATUS_ACK); | |
296 | if (r) | |
297 | DPRINTK (KERN_INFO "%s: Timeout at event 27\n", | |
298 | port->name); | |
299 | ||
300 | /* Event 29: Set nAutoFd high */ | |
301 | parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0); | |
302 | } | |
303 | ||
304 | port->ieee1284.mode = IEEE1284_MODE_COMPAT; | |
305 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; | |
306 | ||
307 | DPRINTK (KERN_DEBUG "%s: In compatibility (forward idle) mode\n", | |
308 | port->name); | |
309 | } | |
310 | #endif /* IEEE1284 support */ | |
311 | ||
312 | /** | |
313 | * parport_negotiate - negotiate an IEEE 1284 mode | |
314 | * @port: port to use | |
315 | * @mode: mode to negotiate to | |
316 | * | |
317 | * Use this to negotiate to a particular IEEE 1284 transfer mode. | |
318 | * The @mode parameter should be one of the constants in | |
319 | * parport.h starting %IEEE1284_MODE_xxx. | |
320 | * | |
321 | * The return value is 0 if the peripheral has accepted the | |
322 | * negotiation to the mode specified, -1 if the peripheral is not | |
323 | * IEEE 1284 compliant (or not present), or 1 if the peripheral | |
324 | * has rejected the negotiation. | |
325 | */ | |
326 | ||
327 | int parport_negotiate (struct parport *port, int mode) | |
328 | { | |
329 | #ifndef CONFIG_PARPORT_1284 | |
330 | if (mode == IEEE1284_MODE_COMPAT) | |
331 | return 0; | |
332 | printk (KERN_ERR "parport: IEEE1284 not supported in this kernel\n"); | |
333 | return -1; | |
334 | #else | |
335 | int m = mode & ~IEEE1284_ADDR; | |
336 | int r; | |
337 | unsigned char xflag; | |
338 | ||
339 | port = port->physport; | |
340 | ||
341 | /* Is there anything to do? */ | |
342 | if (port->ieee1284.mode == mode) | |
343 | return 0; | |
344 | ||
345 | /* Is the difference just an address-or-not bit? */ | |
346 | if ((port->ieee1284.mode & ~IEEE1284_ADDR) == (mode & ~IEEE1284_ADDR)){ | |
347 | port->ieee1284.mode = mode; | |
348 | return 0; | |
349 | } | |
350 | ||
25985edc | 351 | /* Go to compatibility forward idle mode */ |
1da177e4 LT |
352 | if (port->ieee1284.mode != IEEE1284_MODE_COMPAT) |
353 | parport_ieee1284_terminate (port); | |
354 | ||
355 | if (mode == IEEE1284_MODE_COMPAT) | |
356 | /* Compatibility mode: no negotiation. */ | |
357 | return 0; | |
358 | ||
359 | switch (mode) { | |
360 | case IEEE1284_MODE_ECPSWE: | |
361 | m = IEEE1284_MODE_ECP; | |
362 | break; | |
363 | case IEEE1284_MODE_EPPSL: | |
364 | case IEEE1284_MODE_EPPSWE: | |
365 | m = IEEE1284_MODE_EPP; | |
366 | break; | |
367 | case IEEE1284_MODE_BECP: | |
368 | return -ENOSYS; /* FIXME (implement BECP) */ | |
369 | } | |
370 | ||
371 | if (mode & IEEE1284_EXT_LINK) | |
372 | m = 1<<7; /* request extensibility link */ | |
373 | ||
374 | port->ieee1284.phase = IEEE1284_PH_NEGOTIATION; | |
375 | ||
376 | /* Start off with nStrobe and nAutoFd high, and nSelectIn low */ | |
377 | parport_frob_control (port, | |
378 | PARPORT_CONTROL_STROBE | |
379 | | PARPORT_CONTROL_AUTOFD | |
380 | | PARPORT_CONTROL_SELECT, | |
381 | PARPORT_CONTROL_SELECT); | |
382 | udelay(1); | |
383 | ||
384 | /* Event 0: Set data */ | |
385 | parport_data_forward (port); | |
386 | parport_write_data (port, m); | |
387 | udelay (400); /* Shouldn't need to wait this long. */ | |
388 | ||
389 | /* Event 1: Set nSelectIn high, nAutoFd low */ | |
390 | parport_frob_control (port, | |
391 | PARPORT_CONTROL_SELECT | |
392 | | PARPORT_CONTROL_AUTOFD, | |
393 | PARPORT_CONTROL_AUTOFD); | |
394 | ||
395 | /* Event 2: PError, Select, nFault go high, nAck goes low */ | |
396 | if (parport_wait_peripheral (port, | |
397 | PARPORT_STATUS_ERROR | |
398 | | PARPORT_STATUS_SELECT | |
399 | | PARPORT_STATUS_PAPEROUT | |
400 | | PARPORT_STATUS_ACK, | |
401 | PARPORT_STATUS_ERROR | |
402 | | PARPORT_STATUS_SELECT | |
403 | | PARPORT_STATUS_PAPEROUT)) { | |
404 | /* Timeout */ | |
405 | parport_frob_control (port, | |
406 | PARPORT_CONTROL_SELECT | |
407 | | PARPORT_CONTROL_AUTOFD, | |
408 | PARPORT_CONTROL_SELECT); | |
409 | DPRINTK (KERN_DEBUG | |
410 | "%s: Peripheral not IEEE1284 compliant (0x%02X)\n", | |
411 | port->name, parport_read_status (port)); | |
412 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; | |
413 | return -1; /* Not IEEE1284 compliant */ | |
414 | } | |
415 | ||
416 | /* Event 3: Set nStrobe low */ | |
417 | parport_frob_control (port, | |
418 | PARPORT_CONTROL_STROBE, | |
419 | PARPORT_CONTROL_STROBE); | |
420 | ||
421 | /* Event 4: Set nStrobe and nAutoFd high */ | |
422 | udelay (5); | |
423 | parport_frob_control (port, | |
424 | PARPORT_CONTROL_STROBE | |
425 | | PARPORT_CONTROL_AUTOFD, | |
426 | 0); | |
427 | ||
428 | /* Event 6: nAck goes high */ | |
429 | if (parport_wait_peripheral (port, | |
430 | PARPORT_STATUS_ACK, | |
431 | PARPORT_STATUS_ACK)) { | |
432 | /* This shouldn't really happen with a compliant device. */ | |
433 | DPRINTK (KERN_DEBUG | |
434 | "%s: Mode 0x%02x not supported? (0x%02x)\n", | |
435 | port->name, mode, port->ops->read_status (port)); | |
436 | parport_ieee1284_terminate (port); | |
437 | return 1; | |
438 | } | |
439 | ||
440 | xflag = parport_read_status (port) & PARPORT_STATUS_SELECT; | |
441 | ||
442 | /* xflag should be high for all modes other than nibble (0). */ | |
443 | if (mode && !xflag) { | |
444 | /* Mode not supported. */ | |
445 | DPRINTK (KERN_DEBUG "%s: Mode 0x%02x rejected by peripheral\n", | |
446 | port->name, mode); | |
447 | parport_ieee1284_terminate (port); | |
448 | return 1; | |
449 | } | |
450 | ||
451 | /* More to do if we've requested extensibility link. */ | |
452 | if (mode & IEEE1284_EXT_LINK) { | |
453 | m = mode & 0x7f; | |
454 | udelay (1); | |
455 | parport_write_data (port, m); | |
456 | udelay (1); | |
457 | ||
458 | /* Event 51: Set nStrobe low */ | |
459 | parport_frob_control (port, | |
460 | PARPORT_CONTROL_STROBE, | |
461 | PARPORT_CONTROL_STROBE); | |
462 | ||
463 | /* Event 52: nAck goes low */ | |
464 | if (parport_wait_peripheral (port, PARPORT_STATUS_ACK, 0)) { | |
465 | /* This peripheral is _very_ slow. */ | |
466 | DPRINTK (KERN_DEBUG | |
467 | "%s: Event 52 didn't happen\n", | |
468 | port->name); | |
469 | parport_ieee1284_terminate (port); | |
470 | return 1; | |
471 | } | |
472 | ||
473 | /* Event 53: Set nStrobe high */ | |
474 | parport_frob_control (port, | |
475 | PARPORT_CONTROL_STROBE, | |
476 | 0); | |
477 | ||
478 | /* Event 55: nAck goes high */ | |
479 | if (parport_wait_peripheral (port, | |
480 | PARPORT_STATUS_ACK, | |
481 | PARPORT_STATUS_ACK)) { | |
482 | /* This shouldn't really happen with a compliant | |
483 | * device. */ | |
484 | DPRINTK (KERN_DEBUG | |
485 | "%s: Mode 0x%02x not supported? (0x%02x)\n", | |
486 | port->name, mode, | |
487 | port->ops->read_status (port)); | |
488 | parport_ieee1284_terminate (port); | |
489 | return 1; | |
490 | } | |
491 | ||
492 | /* Event 54: Peripheral sets XFlag to reflect support */ | |
493 | xflag = parport_read_status (port) & PARPORT_STATUS_SELECT; | |
494 | ||
495 | /* xflag should be high. */ | |
496 | if (!xflag) { | |
497 | /* Extended mode not supported. */ | |
498 | DPRINTK (KERN_DEBUG "%s: Extended mode 0x%02x not " | |
499 | "supported\n", port->name, mode); | |
500 | parport_ieee1284_terminate (port); | |
501 | return 1; | |
502 | } | |
503 | ||
504 | /* Any further setup is left to the caller. */ | |
505 | } | |
506 | ||
507 | /* Mode is supported */ | |
508 | DPRINTK (KERN_DEBUG "%s: In mode 0x%02x\n", port->name, mode); | |
509 | port->ieee1284.mode = mode; | |
510 | ||
511 | /* But ECP is special */ | |
512 | if (!(mode & IEEE1284_EXT_LINK) && (m & IEEE1284_MODE_ECP)) { | |
513 | port->ieee1284.phase = IEEE1284_PH_ECP_SETUP; | |
514 | ||
515 | /* Event 30: Set nAutoFd low */ | |
516 | parport_frob_control (port, | |
517 | PARPORT_CONTROL_AUTOFD, | |
518 | PARPORT_CONTROL_AUTOFD); | |
519 | ||
520 | /* Event 31: PError goes high. */ | |
521 | r = parport_wait_peripheral (port, | |
522 | PARPORT_STATUS_PAPEROUT, | |
523 | PARPORT_STATUS_PAPEROUT); | |
524 | if (r) { | |
525 | DPRINTK (KERN_INFO "%s: Timeout at event 31\n", | |
526 | port->name); | |
527 | } | |
528 | ||
529 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; | |
530 | DPRINTK (KERN_DEBUG "%s: ECP direction: forward\n", | |
531 | port->name); | |
532 | } else switch (mode) { | |
533 | case IEEE1284_MODE_NIBBLE: | |
534 | case IEEE1284_MODE_BYTE: | |
535 | port->ieee1284.phase = IEEE1284_PH_REV_IDLE; | |
536 | break; | |
537 | default: | |
538 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; | |
539 | } | |
540 | ||
541 | ||
542 | return 0; | |
543 | #endif /* IEEE1284 support */ | |
544 | } | |
545 | ||
546 | /* Acknowledge that the peripheral has data available. | |
547 | * Events 18-20, in order to get from Reverse Idle phase | |
548 | * to Host Busy Data Available. | |
549 | * This will most likely be called from an interrupt. | |
550 | * Returns zero if data was available. | |
551 | */ | |
552 | #ifdef CONFIG_PARPORT_1284 | |
553 | static int parport_ieee1284_ack_data_avail (struct parport *port) | |
554 | { | |
555 | if (parport_read_status (port) & PARPORT_STATUS_ERROR) | |
556 | /* Event 18 didn't happen. */ | |
557 | return -1; | |
558 | ||
559 | /* Event 20: nAutoFd goes high. */ | |
560 | port->ops->frob_control (port, PARPORT_CONTROL_AUTOFD, 0); | |
561 | port->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL; | |
562 | return 0; | |
563 | } | |
564 | #endif /* IEEE1284 support */ | |
565 | ||
566 | /* Handle an interrupt. */ | |
f230d101 | 567 | void parport_ieee1284_interrupt (void *handle) |
1da177e4 LT |
568 | { |
569 | struct parport *port = handle; | |
570 | parport_ieee1284_wakeup (port); | |
571 | ||
572 | #ifdef CONFIG_PARPORT_1284 | |
573 | if (port->ieee1284.phase == IEEE1284_PH_REV_IDLE) { | |
574 | /* An interrupt in this phase means that data | |
575 | * is now available. */ | |
576 | DPRINTK (KERN_DEBUG "%s: Data available\n", port->name); | |
577 | parport_ieee1284_ack_data_avail (port); | |
578 | } | |
579 | #endif /* IEEE1284 support */ | |
580 | } | |
581 | ||
582 | /** | |
583 | * parport_write - write a block of data to a parallel port | |
584 | * @port: port to write to | |
585 | * @buffer: data buffer (in kernel space) | |
586 | * @len: number of bytes of data to transfer | |
587 | * | |
588 | * This will write up to @len bytes of @buffer to the port | |
589 | * specified, using the IEEE 1284 transfer mode most recently | |
590 | * negotiated to (using parport_negotiate()), as long as that | |
591 | * mode supports forward transfers (host to peripheral). | |
592 | * | |
593 | * It is the caller's responsibility to ensure that the first | |
594 | * @len bytes of @buffer are valid. | |
595 | * | |
596 | * This function returns the number of bytes transferred (if zero | |
597 | * or positive), or else an error code. | |
598 | */ | |
599 | ||
600 | ssize_t parport_write (struct parport *port, const void *buffer, size_t len) | |
601 | { | |
602 | #ifndef CONFIG_PARPORT_1284 | |
603 | return port->ops->compat_write_data (port, buffer, len, 0); | |
604 | #else | |
605 | ssize_t retval; | |
606 | int mode = port->ieee1284.mode; | |
607 | int addr = mode & IEEE1284_ADDR; | |
608 | size_t (*fn) (struct parport *, const void *, size_t, int); | |
609 | ||
610 | /* Ignore the device-ID-request bit and the address bit. */ | |
611 | mode &= ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
612 | ||
613 | /* Use the mode we're in. */ | |
614 | switch (mode) { | |
615 | case IEEE1284_MODE_NIBBLE: | |
616 | case IEEE1284_MODE_BYTE: | |
617 | parport_negotiate (port, IEEE1284_MODE_COMPAT); | |
618 | case IEEE1284_MODE_COMPAT: | |
619 | DPRINTK (KERN_DEBUG "%s: Using compatibility mode\n", | |
620 | port->name); | |
621 | fn = port->ops->compat_write_data; | |
622 | break; | |
623 | ||
624 | case IEEE1284_MODE_EPP: | |
625 | DPRINTK (KERN_DEBUG "%s: Using EPP mode\n", port->name); | |
626 | if (addr) { | |
627 | fn = port->ops->epp_write_addr; | |
628 | } else { | |
629 | fn = port->ops->epp_write_data; | |
630 | } | |
631 | break; | |
632 | case IEEE1284_MODE_EPPSWE: | |
633 | DPRINTK (KERN_DEBUG "%s: Using software-emulated EPP mode\n", | |
634 | port->name); | |
635 | if (addr) { | |
636 | fn = parport_ieee1284_epp_write_addr; | |
637 | } else { | |
638 | fn = parport_ieee1284_epp_write_data; | |
639 | } | |
640 | break; | |
641 | case IEEE1284_MODE_ECP: | |
642 | case IEEE1284_MODE_ECPRLE: | |
643 | DPRINTK (KERN_DEBUG "%s: Using ECP mode\n", port->name); | |
644 | if (addr) { | |
645 | fn = port->ops->ecp_write_addr; | |
646 | } else { | |
647 | fn = port->ops->ecp_write_data; | |
648 | } | |
649 | break; | |
650 | ||
651 | case IEEE1284_MODE_ECPSWE: | |
652 | DPRINTK (KERN_DEBUG "%s: Using software-emulated ECP mode\n", | |
653 | port->name); | |
654 | /* The caller has specified that it must be emulated, | |
655 | * even if we have ECP hardware! */ | |
656 | if (addr) { | |
657 | fn = parport_ieee1284_ecp_write_addr; | |
658 | } else { | |
659 | fn = parport_ieee1284_ecp_write_data; | |
660 | } | |
661 | break; | |
662 | ||
663 | default: | |
664 | DPRINTK (KERN_DEBUG "%s: Unknown mode 0x%02x\n", port->name, | |
665 | port->ieee1284.mode); | |
666 | return -ENOSYS; | |
667 | } | |
668 | ||
669 | retval = (*fn) (port, buffer, len, 0); | |
670 | DPRINTK (KERN_DEBUG "%s: wrote %d/%d bytes\n", port->name, retval, len); | |
671 | return retval; | |
672 | #endif /* IEEE1284 support */ | |
673 | } | |
674 | ||
675 | /** | |
676 | * parport_read - read a block of data from a parallel port | |
677 | * @port: port to read from | |
678 | * @buffer: data buffer (in kernel space) | |
679 | * @len: number of bytes of data to transfer | |
680 | * | |
681 | * This will read up to @len bytes of @buffer to the port | |
682 | * specified, using the IEEE 1284 transfer mode most recently | |
683 | * negotiated to (using parport_negotiate()), as long as that | |
684 | * mode supports reverse transfers (peripheral to host). | |
685 | * | |
686 | * It is the caller's responsibility to ensure that the first | |
687 | * @len bytes of @buffer are available to write to. | |
688 | * | |
689 | * This function returns the number of bytes transferred (if zero | |
690 | * or positive), or else an error code. | |
691 | */ | |
692 | ||
693 | ssize_t parport_read (struct parport *port, void *buffer, size_t len) | |
694 | { | |
695 | #ifndef CONFIG_PARPORT_1284 | |
696 | printk (KERN_ERR "parport: IEEE1284 not supported in this kernel\n"); | |
697 | return -ENODEV; | |
698 | #else | |
699 | int mode = port->physport->ieee1284.mode; | |
700 | int addr = mode & IEEE1284_ADDR; | |
701 | size_t (*fn) (struct parport *, void *, size_t, int); | |
702 | ||
703 | /* Ignore the device-ID-request bit and the address bit. */ | |
704 | mode &= ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
705 | ||
706 | /* Use the mode we're in. */ | |
707 | switch (mode) { | |
708 | case IEEE1284_MODE_COMPAT: | |
709 | /* if we can tri-state use BYTE mode instead of NIBBLE mode, | |
710 | * if that fails, revert to NIBBLE mode -- ought to store somewhere | |
711 | * the device's ability to do BYTE mode reverse transfers, so we don't | |
712 | * end up needlessly calling negotiate(BYTE) repeately.. (fb) | |
713 | */ | |
714 | if ((port->physport->modes & PARPORT_MODE_TRISTATE) && | |
715 | !parport_negotiate (port, IEEE1284_MODE_BYTE)) { | |
716 | /* got into BYTE mode OK */ | |
717 | DPRINTK (KERN_DEBUG "%s: Using byte mode\n", port->name); | |
718 | fn = port->ops->byte_read_data; | |
719 | break; | |
720 | } | |
721 | if (parport_negotiate (port, IEEE1284_MODE_NIBBLE)) { | |
722 | return -EIO; | |
723 | } | |
724 | /* fall through to NIBBLE */ | |
725 | case IEEE1284_MODE_NIBBLE: | |
726 | DPRINTK (KERN_DEBUG "%s: Using nibble mode\n", port->name); | |
727 | fn = port->ops->nibble_read_data; | |
728 | break; | |
729 | ||
730 | case IEEE1284_MODE_BYTE: | |
731 | DPRINTK (KERN_DEBUG "%s: Using byte mode\n", port->name); | |
732 | fn = port->ops->byte_read_data; | |
733 | break; | |
734 | ||
735 | case IEEE1284_MODE_EPP: | |
736 | DPRINTK (KERN_DEBUG "%s: Using EPP mode\n", port->name); | |
737 | if (addr) { | |
738 | fn = port->ops->epp_read_addr; | |
739 | } else { | |
740 | fn = port->ops->epp_read_data; | |
741 | } | |
742 | break; | |
743 | case IEEE1284_MODE_EPPSWE: | |
744 | DPRINTK (KERN_DEBUG "%s: Using software-emulated EPP mode\n", | |
745 | port->name); | |
746 | if (addr) { | |
747 | fn = parport_ieee1284_epp_read_addr; | |
748 | } else { | |
749 | fn = parport_ieee1284_epp_read_data; | |
750 | } | |
751 | break; | |
752 | case IEEE1284_MODE_ECP: | |
753 | case IEEE1284_MODE_ECPRLE: | |
754 | DPRINTK (KERN_DEBUG "%s: Using ECP mode\n", port->name); | |
755 | fn = port->ops->ecp_read_data; | |
756 | break; | |
757 | ||
758 | case IEEE1284_MODE_ECPSWE: | |
759 | DPRINTK (KERN_DEBUG "%s: Using software-emulated ECP mode\n", | |
760 | port->name); | |
761 | fn = parport_ieee1284_ecp_read_data; | |
762 | break; | |
763 | ||
764 | default: | |
765 | DPRINTK (KERN_DEBUG "%s: Unknown mode 0x%02x\n", port->name, | |
766 | port->physport->ieee1284.mode); | |
767 | return -ENOSYS; | |
768 | } | |
769 | ||
770 | return (*fn) (port, buffer, len, 0); | |
771 | #endif /* IEEE1284 support */ | |
772 | } | |
773 | ||
774 | /** | |
775 | * parport_set_timeout - set the inactivity timeout for a device | |
776 | * @dev: device on a port | |
777 | * @inactivity: inactivity timeout (in jiffies) | |
778 | * | |
779 | * This sets the inactivity timeout for a particular device on a | |
780 | * port. This affects functions like parport_wait_peripheral(). | |
781 | * The special value 0 means not to call schedule() while dealing | |
782 | * with this device. | |
783 | * | |
784 | * The return value is the previous inactivity timeout. | |
785 | * | |
786 | * Any callers of parport_wait_event() for this device are woken | |
787 | * up. | |
788 | */ | |
789 | ||
790 | long parport_set_timeout (struct pardevice *dev, long inactivity) | |
791 | { | |
792 | long int old = dev->timeout; | |
793 | ||
794 | dev->timeout = inactivity; | |
795 | ||
796 | if (dev->port->physport->cad == dev) | |
797 | parport_ieee1284_wakeup (dev->port); | |
798 | ||
799 | return old; | |
800 | } | |
801 | ||
802 | /* Exported symbols for modules. */ | |
803 | ||
804 | EXPORT_SYMBOL(parport_negotiate); | |
805 | EXPORT_SYMBOL(parport_write); | |
806 | EXPORT_SYMBOL(parport_read); | |
807 | EXPORT_SYMBOL(parport_wait_peripheral); | |
808 | EXPORT_SYMBOL(parport_wait_event); | |
809 | EXPORT_SYMBOL(parport_set_timeout); | |
810 | EXPORT_SYMBOL(parport_ieee1284_interrupt); |