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1 | /*****************************************************************************/ | |
2 | ||
3 | /* | |
4 | * uss720.c -- USS720 USB Parport Cable. | |
5 | * | |
6 | * Copyright (C) 1999, 2005 | |
7 | * Thomas Sailer (t.sailer@alumni.ethz.ch) | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | * | |
23 | * Based on parport_pc.c | |
24 | * | |
25 | * History: | |
26 | * 0.1 04.08.1999 Created | |
27 | * 0.2 07.08.1999 Some fixes mainly suggested by Tim Waugh | |
28 | * Interrupt handling currently disabled because | |
29 | * usb_request_irq crashes somewhere within ohci.c | |
30 | * for no apparent reason (that is for me, anyway) | |
31 | * ECP currently untested | |
32 | * 0.3 10.08.1999 fixing merge errors | |
33 | * 0.4 13.08.1999 Added Vendor/Product ID of Brad Hard's cable | |
34 | * 0.5 20.09.1999 usb_control_msg wrapper used | |
35 | * Nov01.2000 usb_device_table support by Adam J. Richter | |
36 | * 08.04.2001 Identify version on module load. gb | |
37 | * 0.6 02.09.2005 Fix "scheduling in interrupt" problem by making save/restore | |
38 | * context asynchronous | |
39 | * | |
40 | */ | |
41 | ||
42 | /*****************************************************************************/ | |
43 | ||
44 | #include <linux/module.h> | |
45 | #include <linux/socket.h> | |
46 | #include <linux/parport.h> | |
47 | #include <linux/init.h> | |
48 | #include <linux/usb.h> | |
49 | #include <linux/delay.h> | |
50 | #include <linux/completion.h> | |
51 | #include <linux/kref.h> | |
52 | ||
53 | /* | |
54 | * Version Information | |
55 | */ | |
56 | #define DRIVER_VERSION "v0.6" | |
57 | #define DRIVER_AUTHOR "Thomas M. Sailer, t.sailer@alumni.ethz.ch" | |
58 | #define DRIVER_DESC "USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip" | |
59 | ||
60 | /* --------------------------------------------------------------------- */ | |
61 | ||
62 | struct parport_uss720_private { | |
63 | struct usb_device *usbdev; | |
64 | struct parport *pp; | |
65 | struct kref ref_count; | |
66 | __u8 reg[7]; /* USB registers */ | |
67 | struct list_head asynclist; | |
68 | spinlock_t asynclock; | |
69 | }; | |
70 | ||
71 | struct uss720_async_request { | |
72 | struct parport_uss720_private *priv; | |
73 | struct kref ref_count; | |
74 | struct list_head asynclist; | |
75 | struct completion compl; | |
76 | struct urb *urb; | |
77 | struct usb_ctrlrequest dr; | |
78 | __u8 reg[7]; | |
79 | }; | |
80 | ||
81 | /* --------------------------------------------------------------------- */ | |
82 | ||
83 | static void destroy_priv(struct kref *kref) | |
84 | { | |
85 | struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count); | |
86 | ||
87 | usb_put_dev(priv->usbdev); | |
88 | kfree(priv); | |
89 | dbg("destroying priv datastructure"); | |
90 | } | |
91 | ||
92 | static void destroy_async(struct kref *kref) | |
93 | { | |
94 | struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count); | |
95 | struct parport_uss720_private *priv = rq->priv; | |
96 | unsigned long flags; | |
97 | ||
98 | if (likely(rq->urb)) | |
99 | usb_free_urb(rq->urb); | |
100 | spin_lock_irqsave(&priv->asynclock, flags); | |
101 | list_del_init(&rq->asynclist); | |
102 | spin_unlock_irqrestore(&priv->asynclock, flags); | |
103 | kfree(rq); | |
104 | kref_put(&priv->ref_count, destroy_priv); | |
105 | } | |
106 | ||
107 | /* --------------------------------------------------------------------- */ | |
108 | ||
109 | static void async_complete(struct urb *urb) | |
110 | { | |
111 | struct uss720_async_request *rq; | |
112 | struct parport *pp; | |
113 | struct parport_uss720_private *priv; | |
114 | int status = urb->status; | |
115 | ||
116 | rq = urb->context; | |
117 | priv = rq->priv; | |
118 | pp = priv->pp; | |
119 | if (status) { | |
120 | err("async_complete: urb error %d", status); | |
121 | } else if (rq->dr.bRequest == 3) { | |
122 | memcpy(priv->reg, rq->reg, sizeof(priv->reg)); | |
123 | #if 0 | |
124 | dbg("async_complete regs %02x %02x %02x %02x %02x %02x %02x", | |
125 | (unsigned int)priv->reg[0], (unsigned int)priv->reg[1], (unsigned int)priv->reg[2], | |
126 | (unsigned int)priv->reg[3], (unsigned int)priv->reg[4], (unsigned int)priv->reg[5], | |
127 | (unsigned int)priv->reg[6]); | |
128 | #endif | |
129 | /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */ | |
130 | if (rq->reg[2] & rq->reg[1] & 0x10 && pp) | |
131 | parport_generic_irq(pp); | |
132 | } | |
133 | complete(&rq->compl); | |
134 | kref_put(&rq->ref_count, destroy_async); | |
135 | } | |
136 | ||
137 | static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv, | |
138 | __u8 request, __u8 requesttype, __u16 value, __u16 index, | |
139 | gfp_t mem_flags) | |
140 | { | |
141 | struct usb_device *usbdev; | |
142 | struct uss720_async_request *rq; | |
143 | unsigned long flags; | |
144 | int ret; | |
145 | ||
146 | if (!priv) | |
147 | return NULL; | |
148 | usbdev = priv->usbdev; | |
149 | if (!usbdev) | |
150 | return NULL; | |
151 | rq = kmalloc(sizeof(struct uss720_async_request), mem_flags); | |
152 | if (!rq) { | |
153 | err("submit_async_request out of memory"); | |
154 | return NULL; | |
155 | } | |
156 | kref_init(&rq->ref_count); | |
157 | INIT_LIST_HEAD(&rq->asynclist); | |
158 | init_completion(&rq->compl); | |
159 | kref_get(&priv->ref_count); | |
160 | rq->priv = priv; | |
161 | rq->urb = usb_alloc_urb(0, mem_flags); | |
162 | if (!rq->urb) { | |
163 | kref_put(&rq->ref_count, destroy_async); | |
164 | err("submit_async_request out of memory"); | |
165 | return NULL; | |
166 | } | |
167 | rq->dr.bRequestType = requesttype; | |
168 | rq->dr.bRequest = request; | |
169 | rq->dr.wValue = cpu_to_le16(value); | |
170 | rq->dr.wIndex = cpu_to_le16(index); | |
171 | rq->dr.wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0); | |
172 | usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0), | |
173 | (unsigned char *)&rq->dr, | |
174 | (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq); | |
175 | /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */ | |
176 | spin_lock_irqsave(&priv->asynclock, flags); | |
177 | list_add_tail(&rq->asynclist, &priv->asynclist); | |
178 | spin_unlock_irqrestore(&priv->asynclock, flags); | |
179 | ret = usb_submit_urb(rq->urb, mem_flags); | |
180 | if (!ret) { | |
181 | kref_get(&rq->ref_count); | |
182 | return rq; | |
183 | } | |
184 | kref_put(&rq->ref_count, destroy_async); | |
185 | err("submit_async_request submit_urb failed with %d", ret); | |
186 | return NULL; | |
187 | } | |
188 | ||
189 | static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv) | |
190 | { | |
191 | struct uss720_async_request *rq; | |
192 | unsigned long flags; | |
193 | unsigned int ret = 0; | |
194 | ||
195 | spin_lock_irqsave(&priv->asynclock, flags); | |
196 | list_for_each_entry(rq, &priv->asynclist, asynclist) { | |
197 | usb_unlink_urb(rq->urb); | |
198 | ret++; | |
199 | } | |
200 | spin_unlock_irqrestore(&priv->asynclock, flags); | |
201 | return ret; | |
202 | } | |
203 | ||
204 | /* --------------------------------------------------------------------- */ | |
205 | ||
206 | static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags) | |
207 | { | |
208 | struct parport_uss720_private *priv; | |
209 | struct uss720_async_request *rq; | |
210 | static const unsigned char regindex[9] = { | |
211 | 4, 0, 1, 5, 5, 0, 2, 3, 6 | |
212 | }; | |
213 | int ret; | |
214 | ||
215 | if (!pp) | |
216 | return -EIO; | |
217 | priv = pp->private_data; | |
218 | rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags); | |
219 | if (!rq) { | |
220 | err("get_1284_register(%u) failed", (unsigned int)reg); | |
221 | return -EIO; | |
222 | } | |
223 | if (!val) { | |
224 | kref_put(&rq->ref_count, destroy_async); | |
225 | return 0; | |
226 | } | |
227 | if (wait_for_completion_timeout(&rq->compl, HZ)) { | |
228 | ret = rq->urb->status; | |
229 | *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]]; | |
230 | if (ret) | |
231 | printk(KERN_WARNING "get_1284_register: " | |
232 | "usb error %d\n", ret); | |
233 | kref_put(&rq->ref_count, destroy_async); | |
234 | return ret; | |
235 | } | |
236 | printk(KERN_WARNING "get_1284_register timeout\n"); | |
237 | kill_all_async_requests_priv(priv); | |
238 | return -EIO; | |
239 | } | |
240 | ||
241 | static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags) | |
242 | { | |
243 | struct parport_uss720_private *priv; | |
244 | struct uss720_async_request *rq; | |
245 | ||
246 | if (!pp) | |
247 | return -EIO; | |
248 | priv = pp->private_data; | |
249 | rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags); | |
250 | if (!rq) { | |
251 | err("set_1284_register(%u,%u) failed", (unsigned int)reg, (unsigned int)val); | |
252 | return -EIO; | |
253 | } | |
254 | kref_put(&rq->ref_count, destroy_async); | |
255 | return 0; | |
256 | } | |
257 | ||
258 | /* --------------------------------------------------------------------- */ | |
259 | ||
260 | /* ECR modes */ | |
261 | #define ECR_SPP 00 | |
262 | #define ECR_PS2 01 | |
263 | #define ECR_PPF 02 | |
264 | #define ECR_ECP 03 | |
265 | #define ECR_EPP 04 | |
266 | ||
267 | /* Safely change the mode bits in the ECR */ | |
268 | static int change_mode(struct parport *pp, int m) | |
269 | { | |
270 | struct parport_uss720_private *priv = pp->private_data; | |
271 | int mode; | |
272 | __u8 reg; | |
273 | ||
274 | if (get_1284_register(pp, 6, ®, GFP_KERNEL)) | |
275 | return -EIO; | |
276 | /* Bits <7:5> contain the mode. */ | |
277 | mode = (priv->reg[2] >> 5) & 0x7; | |
278 | if (mode == m) | |
279 | return 0; | |
280 | /* We have to go through mode 000 or 001 */ | |
281 | if (mode > ECR_PS2 && m > ECR_PS2) | |
282 | if (change_mode(pp, ECR_PS2)) | |
283 | return -EIO; | |
284 | ||
285 | if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) { | |
286 | /* This mode resets the FIFO, so we may | |
287 | * have to wait for it to drain first. */ | |
288 | unsigned long expire = jiffies + pp->physport->cad->timeout; | |
289 | switch (mode) { | |
290 | case ECR_PPF: /* Parallel Port FIFO mode */ | |
291 | case ECR_ECP: /* ECP Parallel Port mode */ | |
292 | /* Poll slowly. */ | |
293 | for (;;) { | |
294 | if (get_1284_register(pp, 6, ®, GFP_KERNEL)) | |
295 | return -EIO; | |
296 | if (priv->reg[2] & 0x01) | |
297 | break; | |
298 | if (time_after_eq (jiffies, expire)) | |
299 | /* The FIFO is stuck. */ | |
300 | return -EBUSY; | |
301 | msleep_interruptible(10); | |
302 | if (signal_pending (current)) | |
303 | break; | |
304 | } | |
305 | } | |
306 | } | |
307 | /* Set the mode. */ | |
308 | if (set_1284_register(pp, 6, m << 5, GFP_KERNEL)) | |
309 | return -EIO; | |
310 | if (get_1284_register(pp, 6, ®, GFP_KERNEL)) | |
311 | return -EIO; | |
312 | return 0; | |
313 | } | |
314 | ||
315 | /* | |
316 | * Clear TIMEOUT BIT in EPP MODE | |
317 | */ | |
318 | static int clear_epp_timeout(struct parport *pp) | |
319 | { | |
320 | unsigned char stat; | |
321 | ||
322 | if (get_1284_register(pp, 1, &stat, GFP_KERNEL)) | |
323 | return 1; | |
324 | return stat & 1; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Access functions. | |
329 | */ | |
330 | #if 0 | |
331 | static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id) | |
332 | { | |
333 | struct parport *pp = (struct parport *)dev_id; | |
334 | struct parport_uss720_private *priv = pp->private_data; | |
335 | ||
336 | if (usbstatus != 0 || len < 4 || !buffer) | |
337 | return 1; | |
338 | memcpy(priv->reg, buffer, 4); | |
339 | /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */ | |
340 | if (priv->reg[2] & priv->reg[1] & 0x10) | |
341 | parport_generic_irq(pp); | |
342 | return 1; | |
343 | } | |
344 | #endif | |
345 | ||
346 | static void parport_uss720_write_data(struct parport *pp, unsigned char d) | |
347 | { | |
348 | set_1284_register(pp, 0, d, GFP_KERNEL); | |
349 | } | |
350 | ||
351 | static unsigned char parport_uss720_read_data(struct parport *pp) | |
352 | { | |
353 | unsigned char ret; | |
354 | ||
355 | if (get_1284_register(pp, 0, &ret, GFP_KERNEL)) | |
356 | return 0; | |
357 | return ret; | |
358 | } | |
359 | ||
360 | static void parport_uss720_write_control(struct parport *pp, unsigned char d) | |
361 | { | |
362 | struct parport_uss720_private *priv = pp->private_data; | |
363 | ||
364 | d = (d & 0xf) | (priv->reg[1] & 0xf0); | |
365 | if (set_1284_register(pp, 2, d, GFP_KERNEL)) | |
366 | return; | |
367 | priv->reg[1] = d; | |
368 | } | |
369 | ||
370 | static unsigned char parport_uss720_read_control(struct parport *pp) | |
371 | { | |
372 | struct parport_uss720_private *priv = pp->private_data; | |
373 | return priv->reg[1] & 0xf; /* Use soft copy */ | |
374 | } | |
375 | ||
376 | static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val) | |
377 | { | |
378 | struct parport_uss720_private *priv = pp->private_data; | |
379 | unsigned char d; | |
380 | ||
381 | mask &= 0x0f; | |
382 | val &= 0x0f; | |
383 | d = (priv->reg[1] & (~mask)) ^ val; | |
384 | if (set_1284_register(pp, 2, d, GFP_KERNEL)) | |
385 | return 0; | |
386 | priv->reg[1] = d; | |
387 | return d & 0xf; | |
388 | } | |
389 | ||
390 | static unsigned char parport_uss720_read_status(struct parport *pp) | |
391 | { | |
392 | unsigned char ret; | |
393 | ||
394 | if (get_1284_register(pp, 1, &ret, GFP_KERNEL)) | |
395 | return 0; | |
396 | return ret & 0xf8; | |
397 | } | |
398 | ||
399 | static void parport_uss720_disable_irq(struct parport *pp) | |
400 | { | |
401 | struct parport_uss720_private *priv = pp->private_data; | |
402 | unsigned char d; | |
403 | ||
404 | d = priv->reg[1] & ~0x10; | |
405 | if (set_1284_register(pp, 2, d, GFP_KERNEL)) | |
406 | return; | |
407 | priv->reg[1] = d; | |
408 | } | |
409 | ||
410 | static void parport_uss720_enable_irq(struct parport *pp) | |
411 | { | |
412 | struct parport_uss720_private *priv = pp->private_data; | |
413 | unsigned char d; | |
414 | ||
415 | d = priv->reg[1] | 0x10; | |
416 | if (set_1284_register(pp, 2, d, GFP_KERNEL)) | |
417 | return; | |
418 | priv->reg[1] = d; | |
419 | } | |
420 | ||
421 | static void parport_uss720_data_forward (struct parport *pp) | |
422 | { | |
423 | struct parport_uss720_private *priv = pp->private_data; | |
424 | unsigned char d; | |
425 | ||
426 | d = priv->reg[1] & ~0x20; | |
427 | if (set_1284_register(pp, 2, d, GFP_KERNEL)) | |
428 | return; | |
429 | priv->reg[1] = d; | |
430 | } | |
431 | ||
432 | static void parport_uss720_data_reverse (struct parport *pp) | |
433 | { | |
434 | struct parport_uss720_private *priv = pp->private_data; | |
435 | unsigned char d; | |
436 | ||
437 | d = priv->reg[1] | 0x20; | |
438 | if (set_1284_register(pp, 2, d, GFP_KERNEL)) | |
439 | return; | |
440 | priv->reg[1] = d; | |
441 | } | |
442 | ||
443 | static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s) | |
444 | { | |
445 | s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0); | |
446 | s->u.pc.ecr = 0x24; | |
447 | } | |
448 | ||
449 | static void parport_uss720_save_state(struct parport *pp, struct parport_state *s) | |
450 | { | |
451 | struct parport_uss720_private *priv = pp->private_data; | |
452 | ||
453 | #if 0 | |
454 | if (get_1284_register(pp, 2, NULL, GFP_ATOMIC)) | |
455 | return; | |
456 | #endif | |
457 | s->u.pc.ctr = priv->reg[1]; | |
458 | s->u.pc.ecr = priv->reg[2]; | |
459 | } | |
460 | ||
461 | static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s) | |
462 | { | |
463 | struct parport_uss720_private *priv = pp->private_data; | |
464 | ||
465 | set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC); | |
466 | set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC); | |
467 | get_1284_register(pp, 2, NULL, GFP_ATOMIC); | |
468 | priv->reg[1] = s->u.pc.ctr; | |
469 | priv->reg[2] = s->u.pc.ecr; | |
470 | } | |
471 | ||
472 | static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags) | |
473 | { | |
474 | struct parport_uss720_private *priv = pp->private_data; | |
475 | size_t got = 0; | |
476 | ||
477 | if (change_mode(pp, ECR_EPP)) | |
478 | return 0; | |
479 | for (; got < length; got++) { | |
480 | if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL)) | |
481 | break; | |
482 | buf++; | |
483 | if (priv->reg[0] & 0x01) { | |
484 | clear_epp_timeout(pp); | |
485 | break; | |
486 | } | |
487 | } | |
488 | change_mode(pp, ECR_PS2); | |
489 | return got; | |
490 | } | |
491 | ||
492 | static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags) | |
493 | { | |
494 | #if 0 | |
495 | struct parport_uss720_private *priv = pp->private_data; | |
496 | size_t written = 0; | |
497 | ||
498 | if (change_mode(pp, ECR_EPP)) | |
499 | return 0; | |
500 | for (; written < length; written++) { | |
501 | if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL)) | |
502 | break; | |
503 | ((char*)buf)++; | |
504 | if (get_1284_register(pp, 1, NULL, GFP_KERNEL)) | |
505 | break; | |
506 | if (priv->reg[0] & 0x01) { | |
507 | clear_epp_timeout(pp); | |
508 | break; | |
509 | } | |
510 | } | |
511 | change_mode(pp, ECR_PS2); | |
512 | return written; | |
513 | #else | |
514 | struct parport_uss720_private *priv = pp->private_data; | |
515 | struct usb_device *usbdev = priv->usbdev; | |
516 | int rlen; | |
517 | int i; | |
518 | ||
519 | if (!usbdev) | |
520 | return 0; | |
521 | if (change_mode(pp, ECR_EPP)) | |
522 | return 0; | |
523 | i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000); | |
524 | if (i) | |
525 | printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buf, length, rlen); | |
526 | change_mode(pp, ECR_PS2); | |
527 | return rlen; | |
528 | #endif | |
529 | } | |
530 | ||
531 | static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags) | |
532 | { | |
533 | struct parport_uss720_private *priv = pp->private_data; | |
534 | size_t got = 0; | |
535 | ||
536 | if (change_mode(pp, ECR_EPP)) | |
537 | return 0; | |
538 | for (; got < length; got++) { | |
539 | if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL)) | |
540 | break; | |
541 | buf++; | |
542 | if (priv->reg[0] & 0x01) { | |
543 | clear_epp_timeout(pp); | |
544 | break; | |
545 | } | |
546 | } | |
547 | change_mode(pp, ECR_PS2); | |
548 | return got; | |
549 | } | |
550 | ||
551 | static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags) | |
552 | { | |
553 | struct parport_uss720_private *priv = pp->private_data; | |
554 | size_t written = 0; | |
555 | ||
556 | if (change_mode(pp, ECR_EPP)) | |
557 | return 0; | |
558 | for (; written < length; written++) { | |
559 | if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL)) | |
560 | break; | |
561 | buf++; | |
562 | if (get_1284_register(pp, 1, NULL, GFP_KERNEL)) | |
563 | break; | |
564 | if (priv->reg[0] & 0x01) { | |
565 | clear_epp_timeout(pp); | |
566 | break; | |
567 | } | |
568 | } | |
569 | change_mode(pp, ECR_PS2); | |
570 | return written; | |
571 | } | |
572 | ||
573 | static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags) | |
574 | { | |
575 | struct parport_uss720_private *priv = pp->private_data; | |
576 | struct usb_device *usbdev = priv->usbdev; | |
577 | int rlen; | |
578 | int i; | |
579 | ||
580 | if (!usbdev) | |
581 | return 0; | |
582 | if (change_mode(pp, ECR_ECP)) | |
583 | return 0; | |
584 | i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000); | |
585 | if (i) | |
586 | printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen); | |
587 | change_mode(pp, ECR_PS2); | |
588 | return rlen; | |
589 | } | |
590 | ||
591 | static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags) | |
592 | { | |
593 | struct parport_uss720_private *priv = pp->private_data; | |
594 | struct usb_device *usbdev = priv->usbdev; | |
595 | int rlen; | |
596 | int i; | |
597 | ||
598 | if (!usbdev) | |
599 | return 0; | |
600 | if (change_mode(pp, ECR_ECP)) | |
601 | return 0; | |
602 | i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000); | |
603 | if (i) | |
604 | printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %Zu rlen %u\n", buffer, len, rlen); | |
605 | change_mode(pp, ECR_PS2); | |
606 | return rlen; | |
607 | } | |
608 | ||
609 | static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags) | |
610 | { | |
611 | size_t written = 0; | |
612 | ||
613 | if (change_mode(pp, ECR_ECP)) | |
614 | return 0; | |
615 | for (; written < len; written++) { | |
616 | if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL)) | |
617 | break; | |
618 | buffer++; | |
619 | } | |
620 | change_mode(pp, ECR_PS2); | |
621 | return written; | |
622 | } | |
623 | ||
624 | static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags) | |
625 | { | |
626 | struct parport_uss720_private *priv = pp->private_data; | |
627 | struct usb_device *usbdev = priv->usbdev; | |
628 | int rlen; | |
629 | int i; | |
630 | ||
631 | if (!usbdev) | |
632 | return 0; | |
633 | if (change_mode(pp, ECR_PPF)) | |
634 | return 0; | |
635 | i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000); | |
636 | if (i) | |
637 | printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen); | |
638 | change_mode(pp, ECR_PS2); | |
639 | return rlen; | |
640 | } | |
641 | ||
642 | /* --------------------------------------------------------------------- */ | |
643 | ||
644 | static struct parport_operations parport_uss720_ops = | |
645 | { | |
646 | .owner = THIS_MODULE, | |
647 | .write_data = parport_uss720_write_data, | |
648 | .read_data = parport_uss720_read_data, | |
649 | ||
650 | .write_control = parport_uss720_write_control, | |
651 | .read_control = parport_uss720_read_control, | |
652 | .frob_control = parport_uss720_frob_control, | |
653 | ||
654 | .read_status = parport_uss720_read_status, | |
655 | ||
656 | .enable_irq = parport_uss720_enable_irq, | |
657 | .disable_irq = parport_uss720_disable_irq, | |
658 | ||
659 | .data_forward = parport_uss720_data_forward, | |
660 | .data_reverse = parport_uss720_data_reverse, | |
661 | ||
662 | .init_state = parport_uss720_init_state, | |
663 | .save_state = parport_uss720_save_state, | |
664 | .restore_state = parport_uss720_restore_state, | |
665 | ||
666 | .epp_write_data = parport_uss720_epp_write_data, | |
667 | .epp_read_data = parport_uss720_epp_read_data, | |
668 | .epp_write_addr = parport_uss720_epp_write_addr, | |
669 | .epp_read_addr = parport_uss720_epp_read_addr, | |
670 | ||
671 | .ecp_write_data = parport_uss720_ecp_write_data, | |
672 | .ecp_read_data = parport_uss720_ecp_read_data, | |
673 | .ecp_write_addr = parport_uss720_ecp_write_addr, | |
674 | ||
675 | .compat_write_data = parport_uss720_write_compat, | |
676 | .nibble_read_data = parport_ieee1284_read_nibble, | |
677 | .byte_read_data = parport_ieee1284_read_byte, | |
678 | }; | |
679 | ||
680 | /* --------------------------------------------------------------------- */ | |
681 | ||
682 | static int uss720_probe(struct usb_interface *intf, | |
683 | const struct usb_device_id *id) | |
684 | { | |
685 | struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf)); | |
686 | struct usb_host_interface *interface; | |
687 | struct usb_host_endpoint *endpoint; | |
688 | struct parport_uss720_private *priv; | |
689 | struct parport *pp; | |
690 | unsigned char reg; | |
691 | int i; | |
692 | ||
693 | dbg("probe: vendor id 0x%x, device id 0x%x\n", | |
694 | le16_to_cpu(usbdev->descriptor.idVendor), | |
695 | le16_to_cpu(usbdev->descriptor.idProduct)); | |
696 | ||
697 | /* our known interfaces have 3 alternate settings */ | |
698 | if (intf->num_altsetting != 3) { | |
699 | usb_put_dev(usbdev); | |
700 | return -ENODEV; | |
701 | } | |
702 | i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2); | |
703 | dbg("set inteface result %d", i); | |
704 | ||
705 | interface = intf->cur_altsetting; | |
706 | ||
707 | /* | |
708 | * Allocate parport interface | |
709 | */ | |
710 | if (!(priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL))) { | |
711 | usb_put_dev(usbdev); | |
712 | return -ENOMEM; | |
713 | } | |
714 | priv->pp = NULL; | |
715 | priv->usbdev = usbdev; | |
716 | kref_init(&priv->ref_count); | |
717 | spin_lock_init(&priv->asynclock); | |
718 | INIT_LIST_HEAD(&priv->asynclist); | |
719 | if (!(pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops))) { | |
720 | printk(KERN_WARNING "uss720: could not register parport\n"); | |
721 | goto probe_abort; | |
722 | } | |
723 | ||
724 | priv->pp = pp; | |
725 | pp->private_data = priv; | |
726 | pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT; | |
727 | ||
728 | /* set the USS720 control register to manual mode, no ECP compression, enable all ints */ | |
729 | set_1284_register(pp, 7, 0x00, GFP_KERNEL); | |
730 | set_1284_register(pp, 6, 0x30, GFP_KERNEL); /* PS/2 mode */ | |
731 | set_1284_register(pp, 2, 0x0c, GFP_KERNEL); | |
732 | /* debugging */ | |
733 | get_1284_register(pp, 0, ®, GFP_KERNEL); | |
734 | dbg("reg: %02x %02x %02x %02x %02x %02x %02x", | |
735 | priv->reg[0], priv->reg[1], priv->reg[2], priv->reg[3], priv->reg[4], priv->reg[5], priv->reg[6]); | |
736 | ||
737 | endpoint = &interface->endpoint[2]; | |
738 | dbg("epaddr %d interval %d", endpoint->desc.bEndpointAddress, endpoint->desc.bInterval); | |
739 | parport_announce_port(pp); | |
740 | ||
741 | usb_set_intfdata(intf, pp); | |
742 | return 0; | |
743 | ||
744 | probe_abort: | |
745 | kill_all_async_requests_priv(priv); | |
746 | kref_put(&priv->ref_count, destroy_priv); | |
747 | return -ENODEV; | |
748 | } | |
749 | ||
750 | static void uss720_disconnect(struct usb_interface *intf) | |
751 | { | |
752 | struct parport *pp = usb_get_intfdata(intf); | |
753 | struct parport_uss720_private *priv; | |
754 | struct usb_device *usbdev; | |
755 | ||
756 | dbg("disconnect"); | |
757 | usb_set_intfdata(intf, NULL); | |
758 | if (pp) { | |
759 | priv = pp->private_data; | |
760 | usbdev = priv->usbdev; | |
761 | priv->usbdev = NULL; | |
762 | priv->pp = NULL; | |
763 | dbg("parport_remove_port"); | |
764 | parport_remove_port(pp); | |
765 | parport_put_port(pp); | |
766 | kill_all_async_requests_priv(priv); | |
767 | kref_put(&priv->ref_count, destroy_priv); | |
768 | } | |
769 | dbg("disconnect done"); | |
770 | } | |
771 | ||
772 | /* table of cables that work through this driver */ | |
773 | static struct usb_device_id uss720_table [] = { | |
774 | { USB_DEVICE(0x047e, 0x1001) }, | |
775 | { USB_DEVICE(0x0557, 0x2001) }, | |
776 | { USB_DEVICE(0x0729, 0x1284) }, | |
777 | { USB_DEVICE(0x1293, 0x0002) }, | |
778 | { } /* Terminating entry */ | |
779 | }; | |
780 | ||
781 | MODULE_DEVICE_TABLE (usb, uss720_table); | |
782 | ||
783 | ||
784 | static struct usb_driver uss720_driver = { | |
785 | .name = "uss720", | |
786 | .probe = uss720_probe, | |
787 | .disconnect = uss720_disconnect, | |
788 | .id_table = uss720_table, | |
789 | }; | |
790 | ||
791 | /* --------------------------------------------------------------------- */ | |
792 | ||
793 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
794 | MODULE_DESCRIPTION(DRIVER_DESC); | |
795 | MODULE_LICENSE("GPL"); | |
796 | ||
797 | static int __init uss720_init(void) | |
798 | { | |
799 | int retval; | |
800 | retval = usb_register(&uss720_driver); | |
801 | if (retval) | |
802 | goto out; | |
803 | ||
804 | info(DRIVER_VERSION ":" DRIVER_DESC); | |
805 | info("NOTE: this is a special purpose driver to allow nonstandard"); | |
806 | info("protocols (eg. bitbang) over USS720 usb to parallel cables"); | |
807 | info("If you just want to connect to a printer, use usblp instead"); | |
808 | out: | |
809 | return retval; | |
810 | } | |
811 | ||
812 | static void __exit uss720_cleanup(void) | |
813 | { | |
814 | usb_deregister(&uss720_driver); | |
815 | } | |
816 | ||
817 | module_init(uss720_init); | |
818 | module_exit(uss720_cleanup); | |
819 | ||
820 | /* --------------------------------------------------------------------- */ |