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v5.9
  1// SPDX-License-Identifier: GPL-2.0+
  2/*****************************************************************************/
  3
  4/*
  5 *	uss720.c  --  USS720 USB Parport Cable.
  6 *
  7 *	Copyright (C) 1999, 2005, 2010
  8 *	    Thomas Sailer (t.sailer@alumni.ethz.ch)
  9 *
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 10 *  Based on parport_pc.c
 11 *
 12 *  History:
 13 *   0.1  04.08.1999  Created
 14 *   0.2  07.08.1999  Some fixes mainly suggested by Tim Waugh
 15 *		      Interrupt handling currently disabled because
 16 *		      usb_request_irq crashes somewhere within ohci.c
 17 *		      for no apparent reason (that is for me, anyway)
 18 *		      ECP currently untested
 19 *   0.3  10.08.1999  fixing merge errors
 20 *   0.4  13.08.1999  Added Vendor/Product ID of Brad Hard's cable
 21 *   0.5  20.09.1999  usb_control_msg wrapper used
 22 *        Nov01.2000  usb_device_table support by Adam J. Richter
 23 *        08.04.2001  Identify version on module load.  gb
 24 *   0.6  02.09.2005  Fix "scheduling in interrupt" problem by making save/restore
 25 *                    context asynchronous
 26 *
 27 */
 28
 29/*****************************************************************************/
 30
 31#include <linux/module.h>
 32#include <linux/socket.h>
 33#include <linux/parport.h>
 34#include <linux/init.h>
 35#include <linux/usb.h>
 36#include <linux/delay.h>
 37#include <linux/completion.h>
 38#include <linux/kref.h>
 39#include <linux/slab.h>
 40#include <linux/sched/signal.h>
 41
 
 
 
 
 42#define DRIVER_AUTHOR "Thomas M. Sailer, t.sailer@alumni.ethz.ch"
 43#define DRIVER_DESC "USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip"
 44
 45/* --------------------------------------------------------------------- */
 46
 47struct parport_uss720_private {
 48	struct usb_device *usbdev;
 49	struct parport *pp;
 50	struct kref ref_count;
 51	__u8 reg[7];  /* USB registers */
 52	struct list_head asynclist;
 53	spinlock_t asynclock;
 54};
 55
 56struct uss720_async_request {
 57	struct parport_uss720_private *priv;
 58	struct kref ref_count;
 59	struct list_head asynclist;
 60	struct completion compl;
 61	struct urb *urb;
 62	struct usb_ctrlrequest *dr;
 63	__u8 reg[7];
 64};
 65
 66/* --------------------------------------------------------------------- */
 67
 68static void destroy_priv(struct kref *kref)
 69{
 70	struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count);
 71
 72	dev_dbg(&priv->usbdev->dev, "destroying priv datastructure\n");
 73	usb_put_dev(priv->usbdev);
 74	kfree(priv);
 75}
 76
 77static void destroy_async(struct kref *kref)
 78{
 79	struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count);
 80	struct parport_uss720_private *priv = rq->priv;
 81	unsigned long flags;
 82
 83	if (likely(rq->urb))
 84		usb_free_urb(rq->urb);
 85	kfree(rq->dr);
 86	spin_lock_irqsave(&priv->asynclock, flags);
 87	list_del_init(&rq->asynclist);
 88	spin_unlock_irqrestore(&priv->asynclock, flags);
 89	kfree(rq);
 90	kref_put(&priv->ref_count, destroy_priv);
 91}
 92
 93/* --------------------------------------------------------------------- */
 94
 95static void async_complete(struct urb *urb)
 96{
 97	struct uss720_async_request *rq;
 98	struct parport *pp;
 99	struct parport_uss720_private *priv;
100	int status = urb->status;
101
102	rq = urb->context;
103	priv = rq->priv;
104	pp = priv->pp;
105	if (status) {
106		dev_err(&urb->dev->dev, "async_complete: urb error %d\n",
107			status);
108	} else if (rq->dr->bRequest == 3) {
109		memcpy(priv->reg, rq->reg, sizeof(priv->reg));
110#if 0
111		dev_dbg(&priv->usbdev->dev, "async_complete regs %7ph\n",
112			priv->reg);
 
 
 
 
113#endif
114		/* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
115		if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
116			parport_generic_irq(pp);
117	}
118	complete(&rq->compl);
119	kref_put(&rq->ref_count, destroy_async);
120}
121
122static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
123							 __u8 request, __u8 requesttype, __u16 value, __u16 index,
124							 gfp_t mem_flags)
125{
126	struct usb_device *usbdev;
127	struct uss720_async_request *rq;
128	unsigned long flags;
129	int ret;
130
131	if (!priv)
132		return NULL;
133	usbdev = priv->usbdev;
134	if (!usbdev)
135		return NULL;
136	rq = kzalloc(sizeof(struct uss720_async_request), mem_flags);
137	if (!rq)
 
138		return NULL;
 
139	kref_init(&rq->ref_count);
140	INIT_LIST_HEAD(&rq->asynclist);
141	init_completion(&rq->compl);
142	kref_get(&priv->ref_count);
143	rq->priv = priv;
144	rq->urb = usb_alloc_urb(0, mem_flags);
145	if (!rq->urb) {
146		kref_put(&rq->ref_count, destroy_async);
 
147		return NULL;
148	}
149	rq->dr = kmalloc(sizeof(*rq->dr), mem_flags);
150	if (!rq->dr) {
151		kref_put(&rq->ref_count, destroy_async);
152		return NULL;
153	}
154	rq->dr->bRequestType = requesttype;
155	rq->dr->bRequest = request;
156	rq->dr->wValue = cpu_to_le16(value);
157	rq->dr->wIndex = cpu_to_le16(index);
158	rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
159	usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
160			     (unsigned char *)rq->dr,
161			     (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
162	/* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
163	spin_lock_irqsave(&priv->asynclock, flags);
164	list_add_tail(&rq->asynclist, &priv->asynclist);
165	spin_unlock_irqrestore(&priv->asynclock, flags);
166	kref_get(&rq->ref_count);
167	ret = usb_submit_urb(rq->urb, mem_flags);
168	if (!ret)
169		return rq;
170	destroy_async(&rq->ref_count);
171	dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
172	return NULL;
173}
174
175static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
176{
177	struct uss720_async_request *rq;
178	unsigned long flags;
179	unsigned int ret = 0;
180
181	spin_lock_irqsave(&priv->asynclock, flags);
182	list_for_each_entry(rq, &priv->asynclist, asynclist) {
183		usb_unlink_urb(rq->urb);
184		ret++;
185	}
186	spin_unlock_irqrestore(&priv->asynclock, flags);
187	return ret;
188}
189
190/* --------------------------------------------------------------------- */
191
192static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
193{
194	struct parport_uss720_private *priv;
195	struct uss720_async_request *rq;
196	static const unsigned char regindex[9] = {
197		4, 0, 1, 5, 5, 0, 2, 3, 6
198	};
199	int ret;
200
201	if (!pp)
202		return -EIO;
203	priv = pp->private_data;
204	rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
205	if (!rq) {
206		dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
207			(unsigned int)reg);
208		return -EIO;
209	}
210	if (!val) {
211		kref_put(&rq->ref_count, destroy_async);
212		return 0;
213	}
214	if (wait_for_completion_timeout(&rq->compl, HZ)) {
215		ret = rq->urb->status;
216		*val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
217		if (ret)
218			printk(KERN_WARNING "get_1284_register: "
219			       "usb error %d\n", ret);
220		kref_put(&rq->ref_count, destroy_async);
221		return ret;
222	}
223	printk(KERN_WARNING "get_1284_register timeout\n");
224	kill_all_async_requests_priv(priv);
225	return -EIO;
226}
227
228static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
229{
230	struct parport_uss720_private *priv;
231	struct uss720_async_request *rq;
232
233	if (!pp)
234		return -EIO;
235	priv = pp->private_data;
236	rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
237	if (!rq) {
238		dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
239			(unsigned int)reg, (unsigned int)val);
240		return -EIO;
241	}
242	kref_put(&rq->ref_count, destroy_async);
243	return 0;
244}
245
246/* --------------------------------------------------------------------- */
247
248/* ECR modes */
249#define ECR_SPP 00
250#define ECR_PS2 01
251#define ECR_PPF 02
252#define ECR_ECP 03
253#define ECR_EPP 04
254
255/* Safely change the mode bits in the ECR */
256static int change_mode(struct parport *pp, int m)
257{
258	struct parport_uss720_private *priv = pp->private_data;
259	int mode;
260	__u8 reg;
261
262	if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
263		return -EIO;
264	/* Bits <7:5> contain the mode. */
265	mode = (priv->reg[2] >> 5) & 0x7;
266	if (mode == m)
267		return 0;
268	/* We have to go through mode 000 or 001 */
269	if (mode > ECR_PS2 && m > ECR_PS2)
270		if (change_mode(pp, ECR_PS2))
271			return -EIO;
272
273	if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
274		/* This mode resets the FIFO, so we may
275		 * have to wait for it to drain first. */
276		unsigned long expire = jiffies + pp->physport->cad->timeout;
277		switch (mode) {
278		case ECR_PPF: /* Parallel Port FIFO mode */
279		case ECR_ECP: /* ECP Parallel Port mode */
280			/* Poll slowly. */
281			for (;;) {
282				if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
283					return -EIO;
284				if (priv->reg[2] & 0x01)
285					break;
286				if (time_after_eq (jiffies, expire))
287					/* The FIFO is stuck. */
288					return -EBUSY;
289				msleep_interruptible(10);
290				if (signal_pending (current))
291					break;
292			}
293		}
294	}
295	/* Set the mode. */
296	if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
297		return -EIO;
298	if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
299		return -EIO;
300	return 0;
301}
302
303/*
304 * Clear TIMEOUT BIT in EPP MODE
305 */
306static int clear_epp_timeout(struct parport *pp)
307{
308	unsigned char stat;
309
310	if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
311		return 1;
312	return stat & 1;
313}
314
315/*
316 * Access functions.
317 */
318#if 0
319static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
320{
321	struct parport *pp = (struct parport *)dev_id;
322	struct parport_uss720_private *priv = pp->private_data;	
323
324	if (usbstatus != 0 || len < 4 || !buffer)
325		return 1;
326	memcpy(priv->reg, buffer, 4);
327	/* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
328	if (priv->reg[2] & priv->reg[1] & 0x10)
329		parport_generic_irq(pp);
330	return 1;
331}
332#endif
333
334static void parport_uss720_write_data(struct parport *pp, unsigned char d)
335{
336	set_1284_register(pp, 0, d, GFP_KERNEL);
337}
338
339static unsigned char parport_uss720_read_data(struct parport *pp)
340{
341	unsigned char ret;
342
343	if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
344		return 0;
345	return ret;
346}
347
348static void parport_uss720_write_control(struct parport *pp, unsigned char d)
349{
350	struct parport_uss720_private *priv = pp->private_data;	
351
352	d = (d & 0xf) | (priv->reg[1] & 0xf0);
353	if (set_1284_register(pp, 2, d, GFP_KERNEL))
354		return;
355	priv->reg[1] = d;
356}
357
358static unsigned char parport_uss720_read_control(struct parport *pp)
359{
360	struct parport_uss720_private *priv = pp->private_data;	
361	return priv->reg[1] & 0xf; /* Use soft copy */
362}
363
364static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
365{
366	struct parport_uss720_private *priv = pp->private_data;	
367	unsigned char d;
368
369	mask &= 0x0f;
370	val &= 0x0f;
371	d = (priv->reg[1] & (~mask)) ^ val;
372	if (set_1284_register(pp, 2, d, GFP_ATOMIC))
373		return 0;
374	priv->reg[1] = d;
375	return d & 0xf;
376}
377
378static unsigned char parport_uss720_read_status(struct parport *pp)
379{
380	unsigned char ret;
381
382	if (get_1284_register(pp, 1, &ret, GFP_ATOMIC))
383		return 0;
384	return ret & 0xf8;
385}
386
387static void parport_uss720_disable_irq(struct parport *pp)
388{
389	struct parport_uss720_private *priv = pp->private_data;	
390	unsigned char d;
391
392	d = priv->reg[1] & ~0x10;
393	if (set_1284_register(pp, 2, d, GFP_KERNEL))
394		return;
395	priv->reg[1] = d;
396}
397
398static void parport_uss720_enable_irq(struct parport *pp)
399{
400	struct parport_uss720_private *priv = pp->private_data;	
401	unsigned char d;
402
403	d = priv->reg[1] | 0x10;
404	if (set_1284_register(pp, 2, d, GFP_KERNEL))
405		return;
406	priv->reg[1] = d;
407}
408
409static void parport_uss720_data_forward (struct parport *pp)
410{
411	struct parport_uss720_private *priv = pp->private_data;	
412	unsigned char d;
413
414	d = priv->reg[1] & ~0x20;
415	if (set_1284_register(pp, 2, d, GFP_KERNEL))
416		return;
417	priv->reg[1] = d;
418}
419
420static void parport_uss720_data_reverse (struct parport *pp)
421{
422	struct parport_uss720_private *priv = pp->private_data;	
423	unsigned char d;
424
425	d = priv->reg[1] | 0x20;
426	if (set_1284_register(pp, 2, d, GFP_KERNEL))
427		return;
428	priv->reg[1] = d;
429}
430
431static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
432{
433	s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
434	s->u.pc.ecr = 0x24;
435}
436
437static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
438{
439	struct parport_uss720_private *priv = pp->private_data;	
440
441#if 0
442	if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
443		return;
444#endif
445	s->u.pc.ctr = priv->reg[1];
446	s->u.pc.ecr = priv->reg[2];
447}
448
449static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
450{
451	struct parport_uss720_private *priv = pp->private_data;
452
453	set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
454	set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
455	get_1284_register(pp, 2, NULL, GFP_ATOMIC);
456	priv->reg[1] = s->u.pc.ctr;
457	priv->reg[2] = s->u.pc.ecr;
458}
459
460static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
461{
462	struct parport_uss720_private *priv = pp->private_data;	
463	size_t got = 0;
464
465	if (change_mode(pp, ECR_EPP))
466		return 0;
467	for (; got < length; got++) {
468		if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
469			break;
470		buf++;
471		if (priv->reg[0] & 0x01) {
472			clear_epp_timeout(pp);
473			break;
474		}
475	}
476	change_mode(pp, ECR_PS2);
477	return got;
478}
479
480static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
481{
482#if 0
483	struct parport_uss720_private *priv = pp->private_data;	
484	size_t written = 0;
485
486	if (change_mode(pp, ECR_EPP))
487		return 0;
488	for (; written < length; written++) {
489		if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
490			break;
491		((char*)buf)++;
492		if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
493			break;
494		if (priv->reg[0] & 0x01) {
495			clear_epp_timeout(pp);
496			break;
497		}
498	}
499	change_mode(pp, ECR_PS2);
500	return written;
501#else
502	struct parport_uss720_private *priv = pp->private_data;
503	struct usb_device *usbdev = priv->usbdev;
504	int rlen;
505	int i;
506
507	if (!usbdev)
508		return 0;
509	if (change_mode(pp, ECR_EPP))
510		return 0;
511	i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
512	if (i)
513		printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buf, length, rlen);
514	change_mode(pp, ECR_PS2);
515	return rlen;
516#endif
517}
518
519static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
520{
521	struct parport_uss720_private *priv = pp->private_data;	
522	size_t got = 0;
523
524	if (change_mode(pp, ECR_EPP))
525		return 0;
526	for (; got < length; got++) {
527		if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
528			break;
529		buf++;
530		if (priv->reg[0] & 0x01) {
531			clear_epp_timeout(pp);
532			break;
533		}
534	}
535	change_mode(pp, ECR_PS2);
536	return got;
537}
538
539static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
540{
541	struct parport_uss720_private *priv = pp->private_data;	
542	size_t written = 0;
543
544	if (change_mode(pp, ECR_EPP))
545		return 0;
546	for (; written < length; written++) {
547		if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
548			break;
549		buf++;
550		if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
551			break;
552		if (priv->reg[0] & 0x01) {
553			clear_epp_timeout(pp);
554			break;
555		}
556	}
557	change_mode(pp, ECR_PS2);
558	return written;
559}
560
561static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
562{
563	struct parport_uss720_private *priv = pp->private_data;
564	struct usb_device *usbdev = priv->usbdev;
565	int rlen;
566	int i;
567
568	if (!usbdev)
569		return 0;
570	if (change_mode(pp, ECR_ECP))
571		return 0;
572	i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
573	if (i)
574		printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen);
575	change_mode(pp, ECR_PS2);
576	return rlen;
577}
578
579static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
580{
581	struct parport_uss720_private *priv = pp->private_data;
582	struct usb_device *usbdev = priv->usbdev;
583	int rlen;
584	int i;
585
586	if (!usbdev)
587		return 0;
588	if (change_mode(pp, ECR_ECP))
589		return 0;
590	i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
591	if (i)
592		printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %zu rlen %u\n", buffer, len, rlen);
593	change_mode(pp, ECR_PS2);
594	return rlen;
595}
596
597static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
598{
599	size_t written = 0;
600
601	if (change_mode(pp, ECR_ECP))
602		return 0;
603	for (; written < len; written++) {
604		if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
605			break;
606		buffer++;
607	}
608	change_mode(pp, ECR_PS2);
609	return written;
610}
611
612static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
613{
614	struct parport_uss720_private *priv = pp->private_data;
615	struct usb_device *usbdev = priv->usbdev;
616	int rlen;
617	int i;
618
619	if (!usbdev)
620		return 0;
621	if (change_mode(pp, ECR_PPF))
622		return 0;
623	i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
624	if (i)
625		printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen);
626	change_mode(pp, ECR_PS2);
627	return rlen;
628}
629
630/* --------------------------------------------------------------------- */
631
632static struct parport_operations parport_uss720_ops = 
633{
634	.owner =		THIS_MODULE,
635	.write_data =		parport_uss720_write_data,
636	.read_data =		parport_uss720_read_data,
637
638	.write_control =	parport_uss720_write_control,
639	.read_control =		parport_uss720_read_control,
640	.frob_control =		parport_uss720_frob_control,
641
642	.read_status =		parport_uss720_read_status,
643
644	.enable_irq =		parport_uss720_enable_irq,
645	.disable_irq =		parport_uss720_disable_irq,
646
647	.data_forward =		parport_uss720_data_forward,
648	.data_reverse =		parport_uss720_data_reverse,
649
650	.init_state =		parport_uss720_init_state,
651	.save_state =		parport_uss720_save_state,
652	.restore_state =	parport_uss720_restore_state,
653
654	.epp_write_data =	parport_uss720_epp_write_data,
655	.epp_read_data =	parport_uss720_epp_read_data,
656	.epp_write_addr =	parport_uss720_epp_write_addr,
657	.epp_read_addr =	parport_uss720_epp_read_addr,
658
659	.ecp_write_data =	parport_uss720_ecp_write_data,
660	.ecp_read_data =	parport_uss720_ecp_read_data,
661	.ecp_write_addr =	parport_uss720_ecp_write_addr,
662
663	.compat_write_data =	parport_uss720_write_compat,
664	.nibble_read_data =	parport_ieee1284_read_nibble,
665	.byte_read_data =	parport_ieee1284_read_byte,
666};
667
668/* --------------------------------------------------------------------- */
669
670static int uss720_probe(struct usb_interface *intf,
671			const struct usb_device_id *id)
672{
673	struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
674	struct usb_host_interface *interface;
675	struct usb_endpoint_descriptor *epd;
676	struct parport_uss720_private *priv;
677	struct parport *pp;
678	unsigned char reg;
679	int i;
680
681	dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n",
682		le16_to_cpu(usbdev->descriptor.idVendor),
683		le16_to_cpu(usbdev->descriptor.idProduct));
684
685	/* our known interfaces have 3 alternate settings */
686	if (intf->num_altsetting != 3) {
687		usb_put_dev(usbdev);
688		return -ENODEV;
689	}
690	i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
691	dev_dbg(&intf->dev, "set interface result %d\n", i);
692
693	interface = intf->cur_altsetting;
694
695	if (interface->desc.bNumEndpoints < 3) {
696		usb_put_dev(usbdev);
697		return -ENODEV;
698	}
699
700	/*
701	 * Allocate parport interface 
702	 */
703	priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL);
704	if (!priv) {
705		usb_put_dev(usbdev);
706		return -ENOMEM;
707	}
708	priv->pp = NULL;
709	priv->usbdev = usbdev;
710	kref_init(&priv->ref_count);
711	spin_lock_init(&priv->asynclock);
712	INIT_LIST_HEAD(&priv->asynclist);
713	pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops);
714	if (!pp) {
715		printk(KERN_WARNING "uss720: could not register parport\n");
716		goto probe_abort;
717	}
718
719	priv->pp = pp;
720	pp->private_data = priv;
721	pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
722
723	/* set the USS720 control register to manual mode, no ECP compression, enable all ints */
724	set_1284_register(pp, 7, 0x00, GFP_KERNEL);
725	set_1284_register(pp, 6, 0x30, GFP_KERNEL);  /* PS/2 mode */
726	set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
727	/* debugging */
728	get_1284_register(pp, 0, &reg, GFP_KERNEL);
729	dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg);
730
731	i = usb_find_last_int_in_endpoint(interface, &epd);
732	if (!i) {
733		dev_dbg(&intf->dev, "epaddr %d interval %d\n",
734				epd->bEndpointAddress, epd->bInterval);
735	}
736	parport_announce_port(pp);
737
738	usb_set_intfdata(intf, pp);
739	return 0;
740
741probe_abort:
742	kill_all_async_requests_priv(priv);
743	kref_put(&priv->ref_count, destroy_priv);
744	return -ENODEV;
745}
746
747static void uss720_disconnect(struct usb_interface *intf)
748{
749	struct parport *pp = usb_get_intfdata(intf);
750	struct parport_uss720_private *priv;
 
751
752	dev_dbg(&intf->dev, "disconnect\n");
753	usb_set_intfdata(intf, NULL);
754	if (pp) {
755		priv = pp->private_data;
 
756		priv->usbdev = NULL;
757		priv->pp = NULL;
758		dev_dbg(&intf->dev, "parport_remove_port\n");
759		parport_remove_port(pp);
760		parport_put_port(pp);
761		kill_all_async_requests_priv(priv);
762		kref_put(&priv->ref_count, destroy_priv);
763	}
764	dev_dbg(&intf->dev, "disconnect done\n");
765}
766
767/* table of cables that work through this driver */
768static const struct usb_device_id uss720_table[] = {
769	{ USB_DEVICE(0x047e, 0x1001) },
770	{ USB_DEVICE(0x04b8, 0x0002) },
771	{ USB_DEVICE(0x04b8, 0x0003) },
772	{ USB_DEVICE(0x050d, 0x0002) },
773	{ USB_DEVICE(0x050d, 0x1202) },
774	{ USB_DEVICE(0x0557, 0x2001) },
775	{ USB_DEVICE(0x05ab, 0x0002) },
776	{ USB_DEVICE(0x06c6, 0x0100) },
777	{ USB_DEVICE(0x0729, 0x1284) },
778	{ USB_DEVICE(0x1293, 0x0002) },
 
779	{ }						/* Terminating entry */
780};
781
782MODULE_DEVICE_TABLE (usb, uss720_table);
783
784
785static struct usb_driver uss720_driver = {
786	.name =		"uss720",
787	.probe =	uss720_probe,
788	.disconnect =	uss720_disconnect,
789	.id_table =	uss720_table,
790};
791
792/* --------------------------------------------------------------------- */
793
794MODULE_AUTHOR(DRIVER_AUTHOR);
795MODULE_DESCRIPTION(DRIVER_DESC);
796MODULE_LICENSE("GPL");
797
798static int __init uss720_init(void)
799{
800	int retval;
801	retval = usb_register(&uss720_driver);
802	if (retval)
803		goto out;
804
805	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
 
806	printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose "
807	       "driver to allow nonstandard\n");
808	printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over "
809	       "USS720 usb to parallel cables\n");
810	printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a "
811	       "printer, use usblp instead\n");
812out:
813	return retval;
814}
815
816static void __exit uss720_cleanup(void)
817{
818	usb_deregister(&uss720_driver);
819}
820
821module_init(uss720_init);
822module_exit(uss720_cleanup);
823
824/* --------------------------------------------------------------------- */
v3.5.6
 
  1/*****************************************************************************/
  2
  3/*
  4 *	uss720.c  --  USS720 USB Parport Cable.
  5 *
  6 *	Copyright (C) 1999, 2005, 2010
  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#include <linux/slab.h>
 
 53
 54/*
 55 * Version Information
 56 */
 57#define DRIVER_VERSION "v0.6"
 58#define DRIVER_AUTHOR "Thomas M. Sailer, t.sailer@alumni.ethz.ch"
 59#define DRIVER_DESC "USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip"
 60
 61/* --------------------------------------------------------------------- */
 62
 63struct parport_uss720_private {
 64	struct usb_device *usbdev;
 65	struct parport *pp;
 66	struct kref ref_count;
 67	__u8 reg[7];  /* USB registers */
 68	struct list_head asynclist;
 69	spinlock_t asynclock;
 70};
 71
 72struct uss720_async_request {
 73	struct parport_uss720_private *priv;
 74	struct kref ref_count;
 75	struct list_head asynclist;
 76	struct completion compl;
 77	struct urb *urb;
 78	struct usb_ctrlrequest dr;
 79	__u8 reg[7];
 80};
 81
 82/* --------------------------------------------------------------------- */
 83
 84static void destroy_priv(struct kref *kref)
 85{
 86	struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count);
 87
 88	dev_dbg(&priv->usbdev->dev, "destroying priv datastructure\n");
 89	usb_put_dev(priv->usbdev);
 90	kfree(priv);
 91}
 92
 93static void destroy_async(struct kref *kref)
 94{
 95	struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count);
 96	struct parport_uss720_private *priv = rq->priv;
 97	unsigned long flags;
 98
 99	if (likely(rq->urb))
100		usb_free_urb(rq->urb);
 
101	spin_lock_irqsave(&priv->asynclock, flags);
102	list_del_init(&rq->asynclist);
103	spin_unlock_irqrestore(&priv->asynclock, flags);
104	kfree(rq);
105	kref_put(&priv->ref_count, destroy_priv);
106}
107
108/* --------------------------------------------------------------------- */
109
110static void async_complete(struct urb *urb)
111{
112	struct uss720_async_request *rq;
113	struct parport *pp;
114	struct parport_uss720_private *priv;
115	int status = urb->status;
116
117	rq = urb->context;
118	priv = rq->priv;
119	pp = priv->pp;
120	if (status) {
121		dev_err(&urb->dev->dev, "async_complete: urb error %d\n",
122			status);
123	} else if (rq->dr.bRequest == 3) {
124		memcpy(priv->reg, rq->reg, sizeof(priv->reg));
125#if 0
126		dev_dbg(&priv->usbdev->dev,
127			"async_complete regs %02x %02x %02x %02x %02x %02x %02x\n",
128			(unsigned int)priv->reg[0], (unsigned int)priv->reg[1],
129			(unsigned int)priv->reg[2], (unsigned int)priv->reg[3],
130			(unsigned int)priv->reg[4], (unsigned int)priv->reg[5],
131			(unsigned int)priv->reg[6]);
132#endif
133		/* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
134		if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
135			parport_generic_irq(pp);
136	}
137	complete(&rq->compl);
138	kref_put(&rq->ref_count, destroy_async);
139}
140
141static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
142							 __u8 request, __u8 requesttype, __u16 value, __u16 index,
143							 gfp_t mem_flags)
144{
145	struct usb_device *usbdev;
146	struct uss720_async_request *rq;
147	unsigned long flags;
148	int ret;
149
150	if (!priv)
151		return NULL;
152	usbdev = priv->usbdev;
153	if (!usbdev)
154		return NULL;
155	rq = kmalloc(sizeof(struct uss720_async_request), mem_flags);
156	if (!rq) {
157		dev_err(&usbdev->dev, "submit_async_request out of memory\n");
158		return NULL;
159	}
160	kref_init(&rq->ref_count);
161	INIT_LIST_HEAD(&rq->asynclist);
162	init_completion(&rq->compl);
163	kref_get(&priv->ref_count);
164	rq->priv = priv;
165	rq->urb = usb_alloc_urb(0, mem_flags);
166	if (!rq->urb) {
167		kref_put(&rq->ref_count, destroy_async);
168		dev_err(&usbdev->dev, "submit_async_request out of memory\n");
169		return NULL;
170	}
171	rq->dr.bRequestType = requesttype;
172	rq->dr.bRequest = request;
173	rq->dr.wValue = cpu_to_le16(value);
174	rq->dr.wIndex = cpu_to_le16(index);
175	rq->dr.wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
 
 
 
 
 
176	usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
177			     (unsigned char *)&rq->dr,
178			     (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
179	/* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
180	spin_lock_irqsave(&priv->asynclock, flags);
181	list_add_tail(&rq->asynclist, &priv->asynclist);
182	spin_unlock_irqrestore(&priv->asynclock, flags);
183	kref_get(&rq->ref_count);
184	ret = usb_submit_urb(rq->urb, mem_flags);
185	if (!ret)
186		return rq;
187	destroy_async(&rq->ref_count);
188	dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
189	return NULL;
190}
191
192static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
193{
194	struct uss720_async_request *rq;
195	unsigned long flags;
196	unsigned int ret = 0;
197
198	spin_lock_irqsave(&priv->asynclock, flags);
199	list_for_each_entry(rq, &priv->asynclist, asynclist) {
200		usb_unlink_urb(rq->urb);
201		ret++;
202	}
203	spin_unlock_irqrestore(&priv->asynclock, flags);
204	return ret;
205}
206
207/* --------------------------------------------------------------------- */
208
209static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
210{
211	struct parport_uss720_private *priv;
212	struct uss720_async_request *rq;
213	static const unsigned char regindex[9] = {
214		4, 0, 1, 5, 5, 0, 2, 3, 6
215	};
216	int ret;
217
218	if (!pp)
219		return -EIO;
220	priv = pp->private_data;
221	rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
222	if (!rq) {
223		dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
224			(unsigned int)reg);
225		return -EIO;
226	}
227	if (!val) {
228		kref_put(&rq->ref_count, destroy_async);
229		return 0;
230	}
231	if (wait_for_completion_timeout(&rq->compl, HZ)) {
232		ret = rq->urb->status;
233		*val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
234		if (ret)
235			printk(KERN_WARNING "get_1284_register: "
236			       "usb error %d\n", ret);
237		kref_put(&rq->ref_count, destroy_async);
238		return ret;
239	}
240	printk(KERN_WARNING "get_1284_register timeout\n");
241	kill_all_async_requests_priv(priv);
242	return -EIO;
243}
244
245static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
246{
247	struct parport_uss720_private *priv;
248	struct uss720_async_request *rq;
249
250	if (!pp)
251		return -EIO;
252	priv = pp->private_data;
253	rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
254	if (!rq) {
255		dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
256			(unsigned int)reg, (unsigned int)val);
257		return -EIO;
258	}
259	kref_put(&rq->ref_count, destroy_async);
260	return 0;
261}
262
263/* --------------------------------------------------------------------- */
264
265/* ECR modes */
266#define ECR_SPP 00
267#define ECR_PS2 01
268#define ECR_PPF 02
269#define ECR_ECP 03
270#define ECR_EPP 04
271
272/* Safely change the mode bits in the ECR */
273static int change_mode(struct parport *pp, int m)
274{
275	struct parport_uss720_private *priv = pp->private_data;
276	int mode;
277	__u8 reg;
278
279	if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
280		return -EIO;
281	/* Bits <7:5> contain the mode. */
282	mode = (priv->reg[2] >> 5) & 0x7;
283	if (mode == m)
284		return 0;
285	/* We have to go through mode 000 or 001 */
286	if (mode > ECR_PS2 && m > ECR_PS2)
287		if (change_mode(pp, ECR_PS2))
288			return -EIO;
289
290	if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
291		/* This mode resets the FIFO, so we may
292		 * have to wait for it to drain first. */
293		unsigned long expire = jiffies + pp->physport->cad->timeout;
294		switch (mode) {
295		case ECR_PPF: /* Parallel Port FIFO mode */
296		case ECR_ECP: /* ECP Parallel Port mode */
297			/* Poll slowly. */
298			for (;;) {
299				if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
300					return -EIO;
301				if (priv->reg[2] & 0x01)
302					break;
303				if (time_after_eq (jiffies, expire))
304					/* The FIFO is stuck. */
305					return -EBUSY;
306				msleep_interruptible(10);
307				if (signal_pending (current))
308					break;
309			}
310		}
311	}
312	/* Set the mode. */
313	if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
314		return -EIO;
315	if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
316		return -EIO;
317	return 0;
318}
319
320/*
321 * Clear TIMEOUT BIT in EPP MODE
322 */
323static int clear_epp_timeout(struct parport *pp)
324{
325	unsigned char stat;
326
327	if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
328		return 1;
329	return stat & 1;
330}
331
332/*
333 * Access functions.
334 */
335#if 0
336static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
337{
338	struct parport *pp = (struct parport *)dev_id;
339	struct parport_uss720_private *priv = pp->private_data;	
340
341	if (usbstatus != 0 || len < 4 || !buffer)
342		return 1;
343	memcpy(priv->reg, buffer, 4);
344	/* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
345	if (priv->reg[2] & priv->reg[1] & 0x10)
346		parport_generic_irq(pp);
347	return 1;
348}
349#endif
350
351static void parport_uss720_write_data(struct parport *pp, unsigned char d)
352{
353	set_1284_register(pp, 0, d, GFP_KERNEL);
354}
355
356static unsigned char parport_uss720_read_data(struct parport *pp)
357{
358	unsigned char ret;
359
360	if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
361		return 0;
362	return ret;
363}
364
365static void parport_uss720_write_control(struct parport *pp, unsigned char d)
366{
367	struct parport_uss720_private *priv = pp->private_data;	
368
369	d = (d & 0xf) | (priv->reg[1] & 0xf0);
370	if (set_1284_register(pp, 2, d, GFP_KERNEL))
371		return;
372	priv->reg[1] = d;
373}
374
375static unsigned char parport_uss720_read_control(struct parport *pp)
376{
377	struct parport_uss720_private *priv = pp->private_data;	
378	return priv->reg[1] & 0xf; /* Use soft copy */
379}
380
381static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
382{
383	struct parport_uss720_private *priv = pp->private_data;	
384	unsigned char d;
385
386	mask &= 0x0f;
387	val &= 0x0f;
388	d = (priv->reg[1] & (~mask)) ^ val;
389	if (set_1284_register(pp, 2, d, GFP_KERNEL))
390		return 0;
391	priv->reg[1] = d;
392	return d & 0xf;
393}
394
395static unsigned char parport_uss720_read_status(struct parport *pp)
396{
397	unsigned char ret;
398
399	if (get_1284_register(pp, 1, &ret, GFP_KERNEL))
400		return 0;
401	return ret & 0xf8;
402}
403
404static void parport_uss720_disable_irq(struct parport *pp)
405{
406	struct parport_uss720_private *priv = pp->private_data;	
407	unsigned char d;
408
409	d = priv->reg[1] & ~0x10;
410	if (set_1284_register(pp, 2, d, GFP_KERNEL))
411		return;
412	priv->reg[1] = d;
413}
414
415static void parport_uss720_enable_irq(struct parport *pp)
416{
417	struct parport_uss720_private *priv = pp->private_data;	
418	unsigned char d;
419
420	d = priv->reg[1] | 0x10;
421	if (set_1284_register(pp, 2, d, GFP_KERNEL))
422		return;
423	priv->reg[1] = d;
424}
425
426static void parport_uss720_data_forward (struct parport *pp)
427{
428	struct parport_uss720_private *priv = pp->private_data;	
429	unsigned char d;
430
431	d = priv->reg[1] & ~0x20;
432	if (set_1284_register(pp, 2, d, GFP_KERNEL))
433		return;
434	priv->reg[1] = d;
435}
436
437static void parport_uss720_data_reverse (struct parport *pp)
438{
439	struct parport_uss720_private *priv = pp->private_data;	
440	unsigned char d;
441
442	d = priv->reg[1] | 0x20;
443	if (set_1284_register(pp, 2, d, GFP_KERNEL))
444		return;
445	priv->reg[1] = d;
446}
447
448static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
449{
450	s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
451	s->u.pc.ecr = 0x24;
452}
453
454static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
455{
456	struct parport_uss720_private *priv = pp->private_data;	
457
458#if 0
459	if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
460		return;
461#endif
462	s->u.pc.ctr = priv->reg[1];
463	s->u.pc.ecr = priv->reg[2];
464}
465
466static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
467{
468	struct parport_uss720_private *priv = pp->private_data;
469
470	set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
471	set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
472	get_1284_register(pp, 2, NULL, GFP_ATOMIC);
473	priv->reg[1] = s->u.pc.ctr;
474	priv->reg[2] = s->u.pc.ecr;
475}
476
477static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
478{
479	struct parport_uss720_private *priv = pp->private_data;	
480	size_t got = 0;
481
482	if (change_mode(pp, ECR_EPP))
483		return 0;
484	for (; got < length; got++) {
485		if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
486			break;
487		buf++;
488		if (priv->reg[0] & 0x01) {
489			clear_epp_timeout(pp);
490			break;
491		}
492	}
493	change_mode(pp, ECR_PS2);
494	return got;
495}
496
497static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
498{
499#if 0
500	struct parport_uss720_private *priv = pp->private_data;	
501	size_t written = 0;
502
503	if (change_mode(pp, ECR_EPP))
504		return 0;
505	for (; written < length; written++) {
506		if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
507			break;
508		((char*)buf)++;
509		if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
510			break;
511		if (priv->reg[0] & 0x01) {
512			clear_epp_timeout(pp);
513			break;
514		}
515	}
516	change_mode(pp, ECR_PS2);
517	return written;
518#else
519	struct parport_uss720_private *priv = pp->private_data;
520	struct usb_device *usbdev = priv->usbdev;
521	int rlen;
522	int i;
523
524	if (!usbdev)
525		return 0;
526	if (change_mode(pp, ECR_EPP))
527		return 0;
528	i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
529	if (i)
530		printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buf, length, rlen);
531	change_mode(pp, ECR_PS2);
532	return rlen;
533#endif
534}
535
536static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
537{
538	struct parport_uss720_private *priv = pp->private_data;	
539	size_t got = 0;
540
541	if (change_mode(pp, ECR_EPP))
542		return 0;
543	for (; got < length; got++) {
544		if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
545			break;
546		buf++;
547		if (priv->reg[0] & 0x01) {
548			clear_epp_timeout(pp);
549			break;
550		}
551	}
552	change_mode(pp, ECR_PS2);
553	return got;
554}
555
556static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
557{
558	struct parport_uss720_private *priv = pp->private_data;	
559	size_t written = 0;
560
561	if (change_mode(pp, ECR_EPP))
562		return 0;
563	for (; written < length; written++) {
564		if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
565			break;
566		buf++;
567		if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
568			break;
569		if (priv->reg[0] & 0x01) {
570			clear_epp_timeout(pp);
571			break;
572		}
573	}
574	change_mode(pp, ECR_PS2);
575	return written;
576}
577
578static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
579{
580	struct parport_uss720_private *priv = pp->private_data;
581	struct usb_device *usbdev = priv->usbdev;
582	int rlen;
583	int i;
584
585	if (!usbdev)
586		return 0;
587	if (change_mode(pp, ECR_ECP))
588		return 0;
589	i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
590	if (i)
591		printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
592	change_mode(pp, ECR_PS2);
593	return rlen;
594}
595
596static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
597{
598	struct parport_uss720_private *priv = pp->private_data;
599	struct usb_device *usbdev = priv->usbdev;
600	int rlen;
601	int i;
602
603	if (!usbdev)
604		return 0;
605	if (change_mode(pp, ECR_ECP))
606		return 0;
607	i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
608	if (i)
609		printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %Zu rlen %u\n", buffer, len, rlen);
610	change_mode(pp, ECR_PS2);
611	return rlen;
612}
613
614static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
615{
616	size_t written = 0;
617
618	if (change_mode(pp, ECR_ECP))
619		return 0;
620	for (; written < len; written++) {
621		if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
622			break;
623		buffer++;
624	}
625	change_mode(pp, ECR_PS2);
626	return written;
627}
628
629static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
630{
631	struct parport_uss720_private *priv = pp->private_data;
632	struct usb_device *usbdev = priv->usbdev;
633	int rlen;
634	int i;
635
636	if (!usbdev)
637		return 0;
638	if (change_mode(pp, ECR_PPF))
639		return 0;
640	i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
641	if (i)
642		printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
643	change_mode(pp, ECR_PS2);
644	return rlen;
645}
646
647/* --------------------------------------------------------------------- */
648
649static struct parport_operations parport_uss720_ops = 
650{
651	.owner =		THIS_MODULE,
652	.write_data =		parport_uss720_write_data,
653	.read_data =		parport_uss720_read_data,
654
655	.write_control =	parport_uss720_write_control,
656	.read_control =		parport_uss720_read_control,
657	.frob_control =		parport_uss720_frob_control,
658
659	.read_status =		parport_uss720_read_status,
660
661	.enable_irq =		parport_uss720_enable_irq,
662	.disable_irq =		parport_uss720_disable_irq,
663
664	.data_forward =		parport_uss720_data_forward,
665	.data_reverse =		parport_uss720_data_reverse,
666
667	.init_state =		parport_uss720_init_state,
668	.save_state =		parport_uss720_save_state,
669	.restore_state =	parport_uss720_restore_state,
670
671	.epp_write_data =	parport_uss720_epp_write_data,
672	.epp_read_data =	parport_uss720_epp_read_data,
673	.epp_write_addr =	parport_uss720_epp_write_addr,
674	.epp_read_addr =	parport_uss720_epp_read_addr,
675
676	.ecp_write_data =	parport_uss720_ecp_write_data,
677	.ecp_read_data =	parport_uss720_ecp_read_data,
678	.ecp_write_addr =	parport_uss720_ecp_write_addr,
679
680	.compat_write_data =	parport_uss720_write_compat,
681	.nibble_read_data =	parport_ieee1284_read_nibble,
682	.byte_read_data =	parport_ieee1284_read_byte,
683};
684
685/* --------------------------------------------------------------------- */
686
687static int uss720_probe(struct usb_interface *intf,
688			const struct usb_device_id *id)
689{
690	struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
691	struct usb_host_interface *interface;
692	struct usb_host_endpoint *endpoint;
693	struct parport_uss720_private *priv;
694	struct parport *pp;
695	unsigned char reg;
696	int i;
697
698	dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n",
699		le16_to_cpu(usbdev->descriptor.idVendor),
700		le16_to_cpu(usbdev->descriptor.idProduct));
701
702	/* our known interfaces have 3 alternate settings */
703	if (intf->num_altsetting != 3) {
704		usb_put_dev(usbdev);
705		return -ENODEV;
706	}
707	i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
708	dev_dbg(&intf->dev, "set inteface result %d\n", i);
709
710	interface = intf->cur_altsetting;
711
 
 
 
 
 
712	/*
713	 * Allocate parport interface 
714	 */
715	if (!(priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL))) {
 
716		usb_put_dev(usbdev);
717		return -ENOMEM;
718	}
719	priv->pp = NULL;
720	priv->usbdev = usbdev;
721	kref_init(&priv->ref_count);
722	spin_lock_init(&priv->asynclock);
723	INIT_LIST_HEAD(&priv->asynclist);
724	if (!(pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops))) {
 
725		printk(KERN_WARNING "uss720: could not register parport\n");
726		goto probe_abort;
727	}
728
729	priv->pp = pp;
730	pp->private_data = priv;
731	pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
732
733	/* set the USS720 control register to manual mode, no ECP compression, enable all ints */
734	set_1284_register(pp, 7, 0x00, GFP_KERNEL);
735	set_1284_register(pp, 6, 0x30, GFP_KERNEL);  /* PS/2 mode */
736	set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
737	/* debugging */
738	get_1284_register(pp, 0, &reg, GFP_KERNEL);
739	dev_dbg(&intf->dev, "reg: %02x %02x %02x %02x %02x %02x %02x\n",
740		priv->reg[0], priv->reg[1], priv->reg[2], priv->reg[3],
741		priv->reg[4], priv->reg[5], priv->reg[6]);
742
743	endpoint = &interface->endpoint[2];
744	dev_dbg(&intf->dev, "epaddr %d interval %d\n",
745		endpoint->desc.bEndpointAddress, endpoint->desc.bInterval);
746	parport_announce_port(pp);
747
748	usb_set_intfdata(intf, pp);
749	return 0;
750
751probe_abort:
752	kill_all_async_requests_priv(priv);
753	kref_put(&priv->ref_count, destroy_priv);
754	return -ENODEV;
755}
756
757static void uss720_disconnect(struct usb_interface *intf)
758{
759	struct parport *pp = usb_get_intfdata(intf);
760	struct parport_uss720_private *priv;
761	struct usb_device *usbdev;
762
763	dev_dbg(&intf->dev, "disconnect\n");
764	usb_set_intfdata(intf, NULL);
765	if (pp) {
766		priv = pp->private_data;
767		usbdev = priv->usbdev;
768		priv->usbdev = NULL;
769		priv->pp = NULL;
770		dev_dbg(&intf->dev, "parport_remove_port\n");
771		parport_remove_port(pp);
772		parport_put_port(pp);
773		kill_all_async_requests_priv(priv);
774		kref_put(&priv->ref_count, destroy_priv);
775	}
776	dev_dbg(&intf->dev, "disconnect done\n");
777}
778
779/* table of cables that work through this driver */
780static const struct usb_device_id uss720_table[] = {
781	{ USB_DEVICE(0x047e, 0x1001) },
 
 
 
 
782	{ USB_DEVICE(0x0557, 0x2001) },
 
 
783	{ USB_DEVICE(0x0729, 0x1284) },
784	{ USB_DEVICE(0x1293, 0x0002) },
785	{ USB_DEVICE(0x050d, 0x0002) },
786	{ }						/* Terminating entry */
787};
788
789MODULE_DEVICE_TABLE (usb, uss720_table);
790
791
792static struct usb_driver uss720_driver = {
793	.name =		"uss720",
794	.probe =	uss720_probe,
795	.disconnect =	uss720_disconnect,
796	.id_table =	uss720_table,
797};
798
799/* --------------------------------------------------------------------- */
800
801MODULE_AUTHOR(DRIVER_AUTHOR);
802MODULE_DESCRIPTION(DRIVER_DESC);
803MODULE_LICENSE("GPL");
804
805static int __init uss720_init(void)
806{
807	int retval;
808	retval = usb_register(&uss720_driver);
809	if (retval)
810		goto out;
811
812	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
813	       DRIVER_DESC "\n");
814	printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose "
815	       "driver to allow nonstandard\n");
816	printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over "
817	       "USS720 usb to parallel cables\n");
818	printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a "
819	       "printer, use usblp instead\n");
820out:
821	return retval;
822}
823
824static void __exit uss720_cleanup(void)
825{
826	usb_deregister(&uss720_driver);
827}
828
829module_init(uss720_init);
830module_exit(uss720_cleanup);
831
832/* --------------------------------------------------------------------- */