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1 | /* $Id: parport_ieee1284.c,v 1.4 1997/10/19 21:37:21 philip Exp $ |
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/config.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/threads.h> | |
22 | #include <linux/parport.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/timer.h> | |
27 | #include <linux/sched.h> | |
28 | ||
29 | #undef DEBUG /* undef me for production */ | |
30 | ||
31 | #ifdef CONFIG_LP_CONSOLE | |
32 | #undef DEBUG /* Don't want a garbled console */ | |
33 | #endif | |
34 | ||
35 | #ifdef DEBUG | |
36 | #define DPRINTK(stuff...) printk (stuff) | |
37 | #else | |
38 | #define DPRINTK(stuff...) | |
39 | #endif | |
40 | ||
41 | /* Make parport_wait_peripheral wake up. | |
42 | * It will be useful to call this from an interrupt handler. */ | |
43 | static void parport_ieee1284_wakeup (struct parport *port) | |
44 | { | |
45 | up (&port->physport->ieee1284.irq); | |
46 | } | |
47 | ||
48 | static struct parport *port_from_cookie[PARPORT_MAX]; | |
49 | static void timeout_waiting_on_port (unsigned long cookie) | |
50 | { | |
51 | parport_ieee1284_wakeup (port_from_cookie[cookie % PARPORT_MAX]); | |
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; | |
73 | struct timer_list timer; | |
74 | ||
75 | if (!port->physport->cad->timeout) | |
76 | /* Zero timeout is special, and we can't down() the | |
77 | semaphore. */ | |
78 | return 1; | |
79 | ||
80 | init_timer (&timer); | |
81 | timer.expires = jiffies + timeout; | |
82 | timer.function = timeout_waiting_on_port; | |
83 | port_from_cookie[port->number % PARPORT_MAX] = port; | |
84 | timer.data = port->number; | |
85 | ||
86 | add_timer (&timer); | |
87 | ret = down_interruptible (&port->physport->ieee1284.irq); | |
88 | if (!del_timer (&timer) && !ret) | |
89 | /* Timed out. */ | |
90 | ret = 1; | |
91 | ||
92 | return ret; | |
93 | } | |
94 | ||
95 | /** | |
96 | * parport_poll_peripheral - poll status lines | |
97 | * @port: port to watch | |
98 | * @mask: status lines to watch | |
99 | * @result: desired values of chosen status lines | |
100 | * @usec: timeout | |
101 | * | |
102 | * This function busy-waits until the masked status lines have | |
103 | * the desired values, or until the timeout period elapses. The | |
104 | * @mask and @result parameters are bitmasks, with the bits | |
105 | * defined by the constants in parport.h: %PARPORT_STATUS_BUSY, | |
106 | * and so on. | |
107 | * | |
108 | * This function does not call schedule(); instead it busy-waits | |
109 | * using udelay(). It currently has a resolution of 5usec. | |
110 | * | |
111 | * If the status lines take on the desired values before the | |
112 | * timeout period elapses, parport_poll_peripheral() returns zero | |
0ef3b49c | 113 | * immediately. A return value greater than zero indicates |
1da177e4 LT |
114 | * a timeout. An error code (less than zero) indicates an error, |
115 | * most likely a signal that arrived, and the caller should | |
116 | * finish what it is doing as soon as possible. | |
117 | */ | |
118 | ||
119 | int parport_poll_peripheral(struct parport *port, | |
120 | unsigned char mask, | |
121 | unsigned char result, | |
122 | int usec) | |
123 | { | |
124 | /* Zero return code is success, >0 is timeout. */ | |
125 | int count = usec / 5 + 2; | |
126 | int i; | |
127 | unsigned char status; | |
128 | for (i = 0; i < count; i++) { | |
129 | status = parport_read_status (port); | |
130 | if ((status & mask) == result) | |
131 | return 0; | |
132 | if (signal_pending (current)) | |
133 | return -EINTR; | |
134 | if (need_resched()) | |
135 | break; | |
136 | if (i >= 2) | |
137 | udelay (5); | |
138 | } | |
139 | ||
140 | return 1; | |
141 | } | |
142 | ||
143 | /** | |
144 | * parport_wait_peripheral - wait for status lines to change in 35ms | |
145 | * @port: port to watch | |
146 | * @mask: status lines to watch | |
147 | * @result: desired values of chosen status lines | |
148 | * | |
149 | * This function waits until the masked status lines have the | |
150 | * desired values, or until 35ms have elapsed (see IEEE 1284-1994 | |
151 | * page 24 to 25 for why this value in particular is hardcoded). | |
152 | * The @mask and @result parameters are bitmasks, with the bits | |
153 | * defined by the constants in parport.h: %PARPORT_STATUS_BUSY, | |
154 | * and so on. | |
155 | * | |
156 | * The port is polled quickly to start off with, in anticipation | |
157 | * of a fast response from the peripheral. This fast polling | |
158 | * time is configurable (using /proc), and defaults to 500usec. | |
159 | * If the timeout for this port (see parport_set_timeout()) is | |
160 | * zero, the fast polling time is 35ms, and this function does | |
161 | * not call schedule(). | |
162 | * | |
163 | * If the timeout for this port is non-zero, after the fast | |
164 | * polling fails it uses parport_wait_event() to wait for up to | |
165 | * 10ms, waking up if an interrupt occurs. | |
166 | */ | |
167 | ||
168 | int parport_wait_peripheral(struct parport *port, | |
169 | unsigned char mask, | |
170 | unsigned char result) | |
171 | { | |
172 | int ret; | |
173 | int usec; | |
174 | unsigned long deadline; | |
175 | unsigned char status; | |
176 | ||
177 | usec = port->physport->spintime; /* usecs of fast polling */ | |
178 | if (!port->physport->cad->timeout) | |
179 | /* A zero timeout is "special": busy wait for the | |
180 | entire 35ms. */ | |
181 | usec = 35000; | |
182 | ||
183 | /* Fast polling. | |
184 | * | |
185 | * This should be adjustable. | |
186 | * How about making a note (in the device structure) of how long | |
187 | * it takes, so we know for next time? | |
188 | */ | |
189 | ret = parport_poll_peripheral (port, mask, result, usec); | |
190 | if (ret != 1) | |
191 | return ret; | |
192 | ||
193 | if (!port->physport->cad->timeout) | |
194 | /* We may be in an interrupt handler, so we can't poll | |
195 | * slowly anyway. */ | |
196 | return 1; | |
197 | ||
198 | /* 40ms of slow polling. */ | |
7b4ccf8d | 199 | deadline = jiffies + msecs_to_jiffies(40); |
1da177e4 LT |
200 | while (time_before (jiffies, deadline)) { |
201 | int ret; | |
202 | ||
203 | if (signal_pending (current)) | |
204 | return -EINTR; | |
205 | ||
206 | /* Wait for 10ms (or until an interrupt occurs if | |
207 | * the handler is set) */ | |
7b4ccf8d | 208 | if ((ret = parport_wait_event (port, msecs_to_jiffies(10))) < 0) |
1da177e4 LT |
209 | return ret; |
210 | ||
211 | status = parport_read_status (port); | |
212 | if ((status & mask) == result) | |
213 | return 0; | |
214 | ||
215 | if (!ret) { | |
216 | /* parport_wait_event didn't time out, but the | |
217 | * peripheral wasn't actually ready either. | |
218 | * Wait for another 10ms. */ | |
7b4ccf8d | 219 | schedule_timeout_interruptible(msecs_to_jiffies(10)); |
1da177e4 LT |
220 | } |
221 | } | |
222 | ||
223 | return 1; | |
224 | } | |
225 | ||
226 | #ifdef CONFIG_PARPORT_1284 | |
227 | /* Terminate a negotiated mode. */ | |
228 | static void parport_ieee1284_terminate (struct parport *port) | |
229 | { | |
230 | int r; | |
231 | port = port->physport; | |
232 | ||
233 | /* EPP terminates differently. */ | |
234 | switch (port->ieee1284.mode) { | |
235 | case IEEE1284_MODE_EPP: | |
236 | case IEEE1284_MODE_EPPSL: | |
237 | case IEEE1284_MODE_EPPSWE: | |
238 | /* Terminate from EPP mode. */ | |
239 | ||
240 | /* Event 68: Set nInit low */ | |
241 | parport_frob_control (port, PARPORT_CONTROL_INIT, 0); | |
242 | udelay (50); | |
243 | ||
244 | /* Event 69: Set nInit high, nSelectIn low */ | |
245 | parport_frob_control (port, | |
246 | PARPORT_CONTROL_SELECT | |
247 | | PARPORT_CONTROL_INIT, | |
248 | PARPORT_CONTROL_SELECT | |
249 | | PARPORT_CONTROL_INIT); | |
250 | break; | |
251 | ||
252 | case IEEE1284_MODE_ECP: | |
253 | case IEEE1284_MODE_ECPRLE: | |
254 | case IEEE1284_MODE_ECPSWE: | |
255 | /* In ECP we can only terminate from fwd idle phase. */ | |
256 | if (port->ieee1284.phase != IEEE1284_PH_FWD_IDLE) { | |
257 | /* Event 47: Set nInit high */ | |
258 | parport_frob_control (port, | |
259 | PARPORT_CONTROL_INIT | |
260 | | PARPORT_CONTROL_AUTOFD, | |
261 | PARPORT_CONTROL_INIT | |
262 | | PARPORT_CONTROL_AUTOFD); | |
263 | ||
264 | /* Event 49: PError goes high */ | |
265 | r = parport_wait_peripheral (port, | |
266 | PARPORT_STATUS_PAPEROUT, | |
267 | PARPORT_STATUS_PAPEROUT); | |
268 | if (r) | |
269 | DPRINTK (KERN_INFO "%s: Timeout at event 49\n", | |
270 | port->name); | |
271 | ||
272 | parport_data_forward (port); | |
273 | DPRINTK (KERN_DEBUG "%s: ECP direction: forward\n", | |
274 | port->name); | |
275 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; | |
276 | } | |
277 | ||
278 | /* fall-though.. */ | |
279 | ||
280 | default: | |
281 | /* Terminate from all other modes. */ | |
282 | ||
283 | /* Event 22: Set nSelectIn low, nAutoFd high */ | |
284 | parport_frob_control (port, | |
285 | PARPORT_CONTROL_SELECT | |
286 | | PARPORT_CONTROL_AUTOFD, | |
287 | PARPORT_CONTROL_SELECT); | |
288 | ||
289 | /* Event 24: nAck goes low */ | |
290 | r = parport_wait_peripheral (port, PARPORT_STATUS_ACK, 0); | |
291 | if (r) | |
292 | DPRINTK (KERN_INFO "%s: Timeout at event 24\n", | |
293 | port->name); | |
294 | ||
295 | /* Event 25: Set nAutoFd low */ | |
296 | parport_frob_control (port, | |
297 | PARPORT_CONTROL_AUTOFD, | |
298 | PARPORT_CONTROL_AUTOFD); | |
299 | ||
300 | /* Event 27: nAck goes high */ | |
301 | r = parport_wait_peripheral (port, | |
302 | PARPORT_STATUS_ACK, | |
303 | PARPORT_STATUS_ACK); | |
304 | if (r) | |
305 | DPRINTK (KERN_INFO "%s: Timeout at event 27\n", | |
306 | port->name); | |
307 | ||
308 | /* Event 29: Set nAutoFd high */ | |
309 | parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0); | |
310 | } | |
311 | ||
312 | port->ieee1284.mode = IEEE1284_MODE_COMPAT; | |
313 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; | |
314 | ||
315 | DPRINTK (KERN_DEBUG "%s: In compatibility (forward idle) mode\n", | |
316 | port->name); | |
317 | } | |
318 | #endif /* IEEE1284 support */ | |
319 | ||
320 | /** | |
321 | * parport_negotiate - negotiate an IEEE 1284 mode | |
322 | * @port: port to use | |
323 | * @mode: mode to negotiate to | |
324 | * | |
325 | * Use this to negotiate to a particular IEEE 1284 transfer mode. | |
326 | * The @mode parameter should be one of the constants in | |
327 | * parport.h starting %IEEE1284_MODE_xxx. | |
328 | * | |
329 | * The return value is 0 if the peripheral has accepted the | |
330 | * negotiation to the mode specified, -1 if the peripheral is not | |
331 | * IEEE 1284 compliant (or not present), or 1 if the peripheral | |
332 | * has rejected the negotiation. | |
333 | */ | |
334 | ||
335 | int parport_negotiate (struct parport *port, int mode) | |
336 | { | |
337 | #ifndef CONFIG_PARPORT_1284 | |
338 | if (mode == IEEE1284_MODE_COMPAT) | |
339 | return 0; | |
340 | printk (KERN_ERR "parport: IEEE1284 not supported in this kernel\n"); | |
341 | return -1; | |
342 | #else | |
343 | int m = mode & ~IEEE1284_ADDR; | |
344 | int r; | |
345 | unsigned char xflag; | |
346 | ||
347 | port = port->physport; | |
348 | ||
349 | /* Is there anything to do? */ | |
350 | if (port->ieee1284.mode == mode) | |
351 | return 0; | |
352 | ||
353 | /* Is the difference just an address-or-not bit? */ | |
354 | if ((port->ieee1284.mode & ~IEEE1284_ADDR) == (mode & ~IEEE1284_ADDR)){ | |
355 | port->ieee1284.mode = mode; | |
356 | return 0; | |
357 | } | |
358 | ||
359 | /* Go to compability forward idle mode */ | |
360 | if (port->ieee1284.mode != IEEE1284_MODE_COMPAT) | |
361 | parport_ieee1284_terminate (port); | |
362 | ||
363 | if (mode == IEEE1284_MODE_COMPAT) | |
364 | /* Compatibility mode: no negotiation. */ | |
365 | return 0; | |
366 | ||
367 | switch (mode) { | |
368 | case IEEE1284_MODE_ECPSWE: | |
369 | m = IEEE1284_MODE_ECP; | |
370 | break; | |
371 | case IEEE1284_MODE_EPPSL: | |
372 | case IEEE1284_MODE_EPPSWE: | |
373 | m = IEEE1284_MODE_EPP; | |
374 | break; | |
375 | case IEEE1284_MODE_BECP: | |
376 | return -ENOSYS; /* FIXME (implement BECP) */ | |
377 | } | |
378 | ||
379 | if (mode & IEEE1284_EXT_LINK) | |
380 | m = 1<<7; /* request extensibility link */ | |
381 | ||
382 | port->ieee1284.phase = IEEE1284_PH_NEGOTIATION; | |
383 | ||
384 | /* Start off with nStrobe and nAutoFd high, and nSelectIn low */ | |
385 | parport_frob_control (port, | |
386 | PARPORT_CONTROL_STROBE | |
387 | | PARPORT_CONTROL_AUTOFD | |
388 | | PARPORT_CONTROL_SELECT, | |
389 | PARPORT_CONTROL_SELECT); | |
390 | udelay(1); | |
391 | ||
392 | /* Event 0: Set data */ | |
393 | parport_data_forward (port); | |
394 | parport_write_data (port, m); | |
395 | udelay (400); /* Shouldn't need to wait this long. */ | |
396 | ||
397 | /* Event 1: Set nSelectIn high, nAutoFd low */ | |
398 | parport_frob_control (port, | |
399 | PARPORT_CONTROL_SELECT | |
400 | | PARPORT_CONTROL_AUTOFD, | |
401 | PARPORT_CONTROL_AUTOFD); | |
402 | ||
403 | /* Event 2: PError, Select, nFault go high, nAck goes low */ | |
404 | if (parport_wait_peripheral (port, | |
405 | PARPORT_STATUS_ERROR | |
406 | | PARPORT_STATUS_SELECT | |
407 | | PARPORT_STATUS_PAPEROUT | |
408 | | PARPORT_STATUS_ACK, | |
409 | PARPORT_STATUS_ERROR | |
410 | | PARPORT_STATUS_SELECT | |
411 | | PARPORT_STATUS_PAPEROUT)) { | |
412 | /* Timeout */ | |
413 | parport_frob_control (port, | |
414 | PARPORT_CONTROL_SELECT | |
415 | | PARPORT_CONTROL_AUTOFD, | |
416 | PARPORT_CONTROL_SELECT); | |
417 | DPRINTK (KERN_DEBUG | |
418 | "%s: Peripheral not IEEE1284 compliant (0x%02X)\n", | |
419 | port->name, parport_read_status (port)); | |
420 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; | |
421 | return -1; /* Not IEEE1284 compliant */ | |
422 | } | |
423 | ||
424 | /* Event 3: Set nStrobe low */ | |
425 | parport_frob_control (port, | |
426 | PARPORT_CONTROL_STROBE, | |
427 | PARPORT_CONTROL_STROBE); | |
428 | ||
429 | /* Event 4: Set nStrobe and nAutoFd high */ | |
430 | udelay (5); | |
431 | parport_frob_control (port, | |
432 | PARPORT_CONTROL_STROBE | |
433 | | PARPORT_CONTROL_AUTOFD, | |
434 | 0); | |
435 | ||
436 | /* Event 6: nAck goes high */ | |
437 | if (parport_wait_peripheral (port, | |
438 | PARPORT_STATUS_ACK, | |
439 | PARPORT_STATUS_ACK)) { | |
440 | /* This shouldn't really happen with a compliant device. */ | |
441 | DPRINTK (KERN_DEBUG | |
442 | "%s: Mode 0x%02x not supported? (0x%02x)\n", | |
443 | port->name, mode, port->ops->read_status (port)); | |
444 | parport_ieee1284_terminate (port); | |
445 | return 1; | |
446 | } | |
447 | ||
448 | xflag = parport_read_status (port) & PARPORT_STATUS_SELECT; | |
449 | ||
450 | /* xflag should be high for all modes other than nibble (0). */ | |
451 | if (mode && !xflag) { | |
452 | /* Mode not supported. */ | |
453 | DPRINTK (KERN_DEBUG "%s: Mode 0x%02x rejected by peripheral\n", | |
454 | port->name, mode); | |
455 | parport_ieee1284_terminate (port); | |
456 | return 1; | |
457 | } | |
458 | ||
459 | /* More to do if we've requested extensibility link. */ | |
460 | if (mode & IEEE1284_EXT_LINK) { | |
461 | m = mode & 0x7f; | |
462 | udelay (1); | |
463 | parport_write_data (port, m); | |
464 | udelay (1); | |
465 | ||
466 | /* Event 51: Set nStrobe low */ | |
467 | parport_frob_control (port, | |
468 | PARPORT_CONTROL_STROBE, | |
469 | PARPORT_CONTROL_STROBE); | |
470 | ||
471 | /* Event 52: nAck goes low */ | |
472 | if (parport_wait_peripheral (port, PARPORT_STATUS_ACK, 0)) { | |
473 | /* This peripheral is _very_ slow. */ | |
474 | DPRINTK (KERN_DEBUG | |
475 | "%s: Event 52 didn't happen\n", | |
476 | port->name); | |
477 | parport_ieee1284_terminate (port); | |
478 | return 1; | |
479 | } | |
480 | ||
481 | /* Event 53: Set nStrobe high */ | |
482 | parport_frob_control (port, | |
483 | PARPORT_CONTROL_STROBE, | |
484 | 0); | |
485 | ||
486 | /* Event 55: nAck goes high */ | |
487 | if (parport_wait_peripheral (port, | |
488 | PARPORT_STATUS_ACK, | |
489 | PARPORT_STATUS_ACK)) { | |
490 | /* This shouldn't really happen with a compliant | |
491 | * device. */ | |
492 | DPRINTK (KERN_DEBUG | |
493 | "%s: Mode 0x%02x not supported? (0x%02x)\n", | |
494 | port->name, mode, | |
495 | port->ops->read_status (port)); | |
496 | parport_ieee1284_terminate (port); | |
497 | return 1; | |
498 | } | |
499 | ||
500 | /* Event 54: Peripheral sets XFlag to reflect support */ | |
501 | xflag = parport_read_status (port) & PARPORT_STATUS_SELECT; | |
502 | ||
503 | /* xflag should be high. */ | |
504 | if (!xflag) { | |
505 | /* Extended mode not supported. */ | |
506 | DPRINTK (KERN_DEBUG "%s: Extended mode 0x%02x not " | |
507 | "supported\n", port->name, mode); | |
508 | parport_ieee1284_terminate (port); | |
509 | return 1; | |
510 | } | |
511 | ||
512 | /* Any further setup is left to the caller. */ | |
513 | } | |
514 | ||
515 | /* Mode is supported */ | |
516 | DPRINTK (KERN_DEBUG "%s: In mode 0x%02x\n", port->name, mode); | |
517 | port->ieee1284.mode = mode; | |
518 | ||
519 | /* But ECP is special */ | |
520 | if (!(mode & IEEE1284_EXT_LINK) && (m & IEEE1284_MODE_ECP)) { | |
521 | port->ieee1284.phase = IEEE1284_PH_ECP_SETUP; | |
522 | ||
523 | /* Event 30: Set nAutoFd low */ | |
524 | parport_frob_control (port, | |
525 | PARPORT_CONTROL_AUTOFD, | |
526 | PARPORT_CONTROL_AUTOFD); | |
527 | ||
528 | /* Event 31: PError goes high. */ | |
529 | r = parport_wait_peripheral (port, | |
530 | PARPORT_STATUS_PAPEROUT, | |
531 | PARPORT_STATUS_PAPEROUT); | |
532 | if (r) { | |
533 | DPRINTK (KERN_INFO "%s: Timeout at event 31\n", | |
534 | port->name); | |
535 | } | |
536 | ||
537 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; | |
538 | DPRINTK (KERN_DEBUG "%s: ECP direction: forward\n", | |
539 | port->name); | |
540 | } else switch (mode) { | |
541 | case IEEE1284_MODE_NIBBLE: | |
542 | case IEEE1284_MODE_BYTE: | |
543 | port->ieee1284.phase = IEEE1284_PH_REV_IDLE; | |
544 | break; | |
545 | default: | |
546 | port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; | |
547 | } | |
548 | ||
549 | ||
550 | return 0; | |
551 | #endif /* IEEE1284 support */ | |
552 | } | |
553 | ||
554 | /* Acknowledge that the peripheral has data available. | |
555 | * Events 18-20, in order to get from Reverse Idle phase | |
556 | * to Host Busy Data Available. | |
557 | * This will most likely be called from an interrupt. | |
558 | * Returns zero if data was available. | |
559 | */ | |
560 | #ifdef CONFIG_PARPORT_1284 | |
561 | static int parport_ieee1284_ack_data_avail (struct parport *port) | |
562 | { | |
563 | if (parport_read_status (port) & PARPORT_STATUS_ERROR) | |
564 | /* Event 18 didn't happen. */ | |
565 | return -1; | |
566 | ||
567 | /* Event 20: nAutoFd goes high. */ | |
568 | port->ops->frob_control (port, PARPORT_CONTROL_AUTOFD, 0); | |
569 | port->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL; | |
570 | return 0; | |
571 | } | |
572 | #endif /* IEEE1284 support */ | |
573 | ||
574 | /* Handle an interrupt. */ | |
575 | void parport_ieee1284_interrupt (int which, void *handle, struct pt_regs *regs) | |
576 | { | |
577 | struct parport *port = handle; | |
578 | parport_ieee1284_wakeup (port); | |
579 | ||
580 | #ifdef CONFIG_PARPORT_1284 | |
581 | if (port->ieee1284.phase == IEEE1284_PH_REV_IDLE) { | |
582 | /* An interrupt in this phase means that data | |
583 | * is now available. */ | |
584 | DPRINTK (KERN_DEBUG "%s: Data available\n", port->name); | |
585 | parport_ieee1284_ack_data_avail (port); | |
586 | } | |
587 | #endif /* IEEE1284 support */ | |
588 | } | |
589 | ||
590 | /** | |
591 | * parport_write - write a block of data to a parallel port | |
592 | * @port: port to write to | |
593 | * @buffer: data buffer (in kernel space) | |
594 | * @len: number of bytes of data to transfer | |
595 | * | |
596 | * This will write up to @len bytes of @buffer to the port | |
597 | * specified, using the IEEE 1284 transfer mode most recently | |
598 | * negotiated to (using parport_negotiate()), as long as that | |
599 | * mode supports forward transfers (host to peripheral). | |
600 | * | |
601 | * It is the caller's responsibility to ensure that the first | |
602 | * @len bytes of @buffer are valid. | |
603 | * | |
604 | * This function returns the number of bytes transferred (if zero | |
605 | * or positive), or else an error code. | |
606 | */ | |
607 | ||
608 | ssize_t parport_write (struct parport *port, const void *buffer, size_t len) | |
609 | { | |
610 | #ifndef CONFIG_PARPORT_1284 | |
611 | return port->ops->compat_write_data (port, buffer, len, 0); | |
612 | #else | |
613 | ssize_t retval; | |
614 | int mode = port->ieee1284.mode; | |
615 | int addr = mode & IEEE1284_ADDR; | |
616 | size_t (*fn) (struct parport *, const void *, size_t, int); | |
617 | ||
618 | /* Ignore the device-ID-request bit and the address bit. */ | |
619 | mode &= ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
620 | ||
621 | /* Use the mode we're in. */ | |
622 | switch (mode) { | |
623 | case IEEE1284_MODE_NIBBLE: | |
624 | case IEEE1284_MODE_BYTE: | |
625 | parport_negotiate (port, IEEE1284_MODE_COMPAT); | |
626 | case IEEE1284_MODE_COMPAT: | |
627 | DPRINTK (KERN_DEBUG "%s: Using compatibility mode\n", | |
628 | port->name); | |
629 | fn = port->ops->compat_write_data; | |
630 | break; | |
631 | ||
632 | case IEEE1284_MODE_EPP: | |
633 | DPRINTK (KERN_DEBUG "%s: Using EPP mode\n", port->name); | |
634 | if (addr) { | |
635 | fn = port->ops->epp_write_addr; | |
636 | } else { | |
637 | fn = port->ops->epp_write_data; | |
638 | } | |
639 | break; | |
640 | case IEEE1284_MODE_EPPSWE: | |
641 | DPRINTK (KERN_DEBUG "%s: Using software-emulated EPP mode\n", | |
642 | port->name); | |
643 | if (addr) { | |
644 | fn = parport_ieee1284_epp_write_addr; | |
645 | } else { | |
646 | fn = parport_ieee1284_epp_write_data; | |
647 | } | |
648 | break; | |
649 | case IEEE1284_MODE_ECP: | |
650 | case IEEE1284_MODE_ECPRLE: | |
651 | DPRINTK (KERN_DEBUG "%s: Using ECP mode\n", port->name); | |
652 | if (addr) { | |
653 | fn = port->ops->ecp_write_addr; | |
654 | } else { | |
655 | fn = port->ops->ecp_write_data; | |
656 | } | |
657 | break; | |
658 | ||
659 | case IEEE1284_MODE_ECPSWE: | |
660 | DPRINTK (KERN_DEBUG "%s: Using software-emulated ECP mode\n", | |
661 | port->name); | |
662 | /* The caller has specified that it must be emulated, | |
663 | * even if we have ECP hardware! */ | |
664 | if (addr) { | |
665 | fn = parport_ieee1284_ecp_write_addr; | |
666 | } else { | |
667 | fn = parport_ieee1284_ecp_write_data; | |
668 | } | |
669 | break; | |
670 | ||
671 | default: | |
672 | DPRINTK (KERN_DEBUG "%s: Unknown mode 0x%02x\n", port->name, | |
673 | port->ieee1284.mode); | |
674 | return -ENOSYS; | |
675 | } | |
676 | ||
677 | retval = (*fn) (port, buffer, len, 0); | |
678 | DPRINTK (KERN_DEBUG "%s: wrote %d/%d bytes\n", port->name, retval, len); | |
679 | return retval; | |
680 | #endif /* IEEE1284 support */ | |
681 | } | |
682 | ||
683 | /** | |
684 | * parport_read - read a block of data from a parallel port | |
685 | * @port: port to read from | |
686 | * @buffer: data buffer (in kernel space) | |
687 | * @len: number of bytes of data to transfer | |
688 | * | |
689 | * This will read up to @len bytes of @buffer to the port | |
690 | * specified, using the IEEE 1284 transfer mode most recently | |
691 | * negotiated to (using parport_negotiate()), as long as that | |
692 | * mode supports reverse transfers (peripheral to host). | |
693 | * | |
694 | * It is the caller's responsibility to ensure that the first | |
695 | * @len bytes of @buffer are available to write to. | |
696 | * | |
697 | * This function returns the number of bytes transferred (if zero | |
698 | * or positive), or else an error code. | |
699 | */ | |
700 | ||
701 | ssize_t parport_read (struct parport *port, void *buffer, size_t len) | |
702 | { | |
703 | #ifndef CONFIG_PARPORT_1284 | |
704 | printk (KERN_ERR "parport: IEEE1284 not supported in this kernel\n"); | |
705 | return -ENODEV; | |
706 | #else | |
707 | int mode = port->physport->ieee1284.mode; | |
708 | int addr = mode & IEEE1284_ADDR; | |
709 | size_t (*fn) (struct parport *, void *, size_t, int); | |
710 | ||
711 | /* Ignore the device-ID-request bit and the address bit. */ | |
712 | mode &= ~(IEEE1284_DEVICEID | IEEE1284_ADDR); | |
713 | ||
714 | /* Use the mode we're in. */ | |
715 | switch (mode) { | |
716 | case IEEE1284_MODE_COMPAT: | |
717 | /* if we can tri-state use BYTE mode instead of NIBBLE mode, | |
718 | * if that fails, revert to NIBBLE mode -- ought to store somewhere | |
719 | * the device's ability to do BYTE mode reverse transfers, so we don't | |
720 | * end up needlessly calling negotiate(BYTE) repeately.. (fb) | |
721 | */ | |
722 | if ((port->physport->modes & PARPORT_MODE_TRISTATE) && | |
723 | !parport_negotiate (port, IEEE1284_MODE_BYTE)) { | |
724 | /* got into BYTE mode OK */ | |
725 | DPRINTK (KERN_DEBUG "%s: Using byte mode\n", port->name); | |
726 | fn = port->ops->byte_read_data; | |
727 | break; | |
728 | } | |
729 | if (parport_negotiate (port, IEEE1284_MODE_NIBBLE)) { | |
730 | return -EIO; | |
731 | } | |
732 | /* fall through to NIBBLE */ | |
733 | case IEEE1284_MODE_NIBBLE: | |
734 | DPRINTK (KERN_DEBUG "%s: Using nibble mode\n", port->name); | |
735 | fn = port->ops->nibble_read_data; | |
736 | break; | |
737 | ||
738 | case IEEE1284_MODE_BYTE: | |
739 | DPRINTK (KERN_DEBUG "%s: Using byte mode\n", port->name); | |
740 | fn = port->ops->byte_read_data; | |
741 | break; | |
742 | ||
743 | case IEEE1284_MODE_EPP: | |
744 | DPRINTK (KERN_DEBUG "%s: Using EPP mode\n", port->name); | |
745 | if (addr) { | |
746 | fn = port->ops->epp_read_addr; | |
747 | } else { | |
748 | fn = port->ops->epp_read_data; | |
749 | } | |
750 | break; | |
751 | case IEEE1284_MODE_EPPSWE: | |
752 | DPRINTK (KERN_DEBUG "%s: Using software-emulated EPP mode\n", | |
753 | port->name); | |
754 | if (addr) { | |
755 | fn = parport_ieee1284_epp_read_addr; | |
756 | } else { | |
757 | fn = parport_ieee1284_epp_read_data; | |
758 | } | |
759 | break; | |
760 | case IEEE1284_MODE_ECP: | |
761 | case IEEE1284_MODE_ECPRLE: | |
762 | DPRINTK (KERN_DEBUG "%s: Using ECP mode\n", port->name); | |
763 | fn = port->ops->ecp_read_data; | |
764 | break; | |
765 | ||
766 | case IEEE1284_MODE_ECPSWE: | |
767 | DPRINTK (KERN_DEBUG "%s: Using software-emulated ECP mode\n", | |
768 | port->name); | |
769 | fn = parport_ieee1284_ecp_read_data; | |
770 | break; | |
771 | ||
772 | default: | |
773 | DPRINTK (KERN_DEBUG "%s: Unknown mode 0x%02x\n", port->name, | |
774 | port->physport->ieee1284.mode); | |
775 | return -ENOSYS; | |
776 | } | |
777 | ||
778 | return (*fn) (port, buffer, len, 0); | |
779 | #endif /* IEEE1284 support */ | |
780 | } | |
781 | ||
782 | /** | |
783 | * parport_set_timeout - set the inactivity timeout for a device | |
784 | * @dev: device on a port | |
785 | * @inactivity: inactivity timeout (in jiffies) | |
786 | * | |
787 | * This sets the inactivity timeout for a particular device on a | |
788 | * port. This affects functions like parport_wait_peripheral(). | |
789 | * The special value 0 means not to call schedule() while dealing | |
790 | * with this device. | |
791 | * | |
792 | * The return value is the previous inactivity timeout. | |
793 | * | |
794 | * Any callers of parport_wait_event() for this device are woken | |
795 | * up. | |
796 | */ | |
797 | ||
798 | long parport_set_timeout (struct pardevice *dev, long inactivity) | |
799 | { | |
800 | long int old = dev->timeout; | |
801 | ||
802 | dev->timeout = inactivity; | |
803 | ||
804 | if (dev->port->physport->cad == dev) | |
805 | parport_ieee1284_wakeup (dev->port); | |
806 | ||
807 | return old; | |
808 | } | |
809 | ||
810 | /* Exported symbols for modules. */ | |
811 | ||
812 | EXPORT_SYMBOL(parport_negotiate); | |
813 | EXPORT_SYMBOL(parport_write); | |
814 | EXPORT_SYMBOL(parport_read); | |
815 | EXPORT_SYMBOL(parport_wait_peripheral); | |
816 | EXPORT_SYMBOL(parport_wait_event); | |
817 | EXPORT_SYMBOL(parport_set_timeout); | |
818 | EXPORT_SYMBOL(parport_ieee1284_interrupt); |