Linux Audio

Check our new training course

Loading...
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/* --------------------------------------------------------------------- */
v6.2
  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	priv->usbdev = NULL;
 75	kfree(priv);
 76}
 77
 78static void destroy_async(struct kref *kref)
 79{
 80	struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count);
 81	struct parport_uss720_private *priv = rq->priv;
 82	unsigned long flags;
 83
 84	if (likely(rq->urb))
 85		usb_free_urb(rq->urb);
 86	kfree(rq->dr);
 87	spin_lock_irqsave(&priv->asynclock, flags);
 88	list_del_init(&rq->asynclist);
 89	spin_unlock_irqrestore(&priv->asynclock, flags);
 90	kfree(rq);
 91	kref_put(&priv->ref_count, destroy_priv);
 92}
 93
 94/* --------------------------------------------------------------------- */
 95
 96static void async_complete(struct urb *urb)
 97{
 98	struct uss720_async_request *rq;
 99	struct parport *pp;
100	struct parport_uss720_private *priv;
101	int status = urb->status;
102
103	rq = urb->context;
104	priv = rq->priv;
105	pp = priv->pp;
106	if (status) {
107		dev_err(&urb->dev->dev, "async_complete: urb error %d\n",
108			status);
109	} else if (rq->dr->bRequest == 3) {
110		memcpy(priv->reg, rq->reg, sizeof(priv->reg));
111#if 0
112		dev_dbg(&priv->usbdev->dev, "async_complete regs %7ph\n",
113			priv->reg);
114#endif
115		/* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
116		if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
117			parport_generic_irq(pp);
118	}
119	complete(&rq->compl);
120	kref_put(&rq->ref_count, destroy_async);
121}
122
123static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
124							 __u8 request, __u8 requesttype, __u16 value, __u16 index,
125							 gfp_t mem_flags)
126{
127	struct usb_device *usbdev;
128	struct uss720_async_request *rq;
129	unsigned long flags;
130	int ret;
131
132	if (!priv)
133		return NULL;
134	usbdev = priv->usbdev;
135	if (!usbdev)
136		return NULL;
137	rq = kzalloc(sizeof(struct uss720_async_request), mem_flags);
138	if (!rq)
139		return NULL;
140	kref_init(&rq->ref_count);
141	INIT_LIST_HEAD(&rq->asynclist);
142	init_completion(&rq->compl);
143	kref_get(&priv->ref_count);
144	rq->priv = priv;
145	rq->urb = usb_alloc_urb(0, mem_flags);
146	if (!rq->urb) {
147		kref_put(&rq->ref_count, destroy_async);
148		return NULL;
149	}
150	rq->dr = kmalloc(sizeof(*rq->dr), mem_flags);
151	if (!rq->dr) {
152		kref_put(&rq->ref_count, destroy_async);
153		return NULL;
154	}
155	rq->dr->bRequestType = requesttype;
156	rq->dr->bRequest = request;
157	rq->dr->wValue = cpu_to_le16(value);
158	rq->dr->wIndex = cpu_to_le16(index);
159	rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
160	usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
161			     (unsigned char *)rq->dr,
162			     (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
163	/* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
164	spin_lock_irqsave(&priv->asynclock, flags);
165	list_add_tail(&rq->asynclist, &priv->asynclist);
166	spin_unlock_irqrestore(&priv->asynclock, flags);
167	kref_get(&rq->ref_count);
168	ret = usb_submit_urb(rq->urb, mem_flags);
169	if (!ret)
170		return rq;
171	destroy_async(&rq->ref_count);
172	dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
173	return NULL;
174}
175
176static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
177{
178	struct uss720_async_request *rq;
179	unsigned long flags;
180	unsigned int ret = 0;
181
182	spin_lock_irqsave(&priv->asynclock, flags);
183	list_for_each_entry(rq, &priv->asynclist, asynclist) {
184		usb_unlink_urb(rq->urb);
185		ret++;
186	}
187	spin_unlock_irqrestore(&priv->asynclock, flags);
188	return ret;
189}
190
191/* --------------------------------------------------------------------- */
192
193static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
194{
195	struct parport_uss720_private *priv;
196	struct uss720_async_request *rq;
197	static const unsigned char regindex[9] = {
198		4, 0, 1, 5, 5, 0, 2, 3, 6
199	};
200	int ret;
201
202	if (!pp)
203		return -EIO;
204	priv = pp->private_data;
205	rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
206	if (!rq) {
207		dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
208			(unsigned int)reg);
209		return -EIO;
210	}
211	if (!val) {
212		kref_put(&rq->ref_count, destroy_async);
213		return 0;
214	}
215	if (wait_for_completion_timeout(&rq->compl, HZ)) {
216		ret = rq->urb->status;
217		*val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
218		if (ret)
219			printk(KERN_WARNING "get_1284_register: "
220			       "usb error %d\n", ret);
221		kref_put(&rq->ref_count, destroy_async);
222		return ret;
223	}
224	printk(KERN_WARNING "get_1284_register timeout\n");
225	kill_all_async_requests_priv(priv);
226	return -EIO;
227}
228
229static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
230{
231	struct parport_uss720_private *priv;
232	struct uss720_async_request *rq;
233
234	if (!pp)
235		return -EIO;
236	priv = pp->private_data;
237	rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
238	if (!rq) {
239		dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
240			(unsigned int)reg, (unsigned int)val);
241		return -EIO;
242	}
243	kref_put(&rq->ref_count, destroy_async);
244	return 0;
245}
246
247/* --------------------------------------------------------------------- */
248
249/* ECR modes */
250#define ECR_SPP 00
251#define ECR_PS2 01
252#define ECR_PPF 02
253#define ECR_ECP 03
254#define ECR_EPP 04
255
256/* Safely change the mode bits in the ECR */
257static int change_mode(struct parport *pp, int m)
258{
259	struct parport_uss720_private *priv = pp->private_data;
260	int mode;
261	__u8 reg;
262
263	if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
264		return -EIO;
265	/* Bits <7:5> contain the mode. */
266	mode = (priv->reg[2] >> 5) & 0x7;
267	if (mode == m)
268		return 0;
269	/* We have to go through mode 000 or 001 */
270	if (mode > ECR_PS2 && m > ECR_PS2)
271		if (change_mode(pp, ECR_PS2))
272			return -EIO;
273
274	if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
275		/* This mode resets the FIFO, so we may
276		 * have to wait for it to drain first. */
277		unsigned long expire = jiffies + pp->physport->cad->timeout;
278		switch (mode) {
279		case ECR_PPF: /* Parallel Port FIFO mode */
280		case ECR_ECP: /* ECP Parallel Port mode */
281			/* Poll slowly. */
282			for (;;) {
283				if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
284					return -EIO;
285				if (priv->reg[2] & 0x01)
286					break;
287				if (time_after_eq (jiffies, expire))
288					/* The FIFO is stuck. */
289					return -EBUSY;
290				msleep_interruptible(10);
291				if (signal_pending (current))
292					break;
293			}
294		}
295	}
296	/* Set the mode. */
297	if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
298		return -EIO;
299	if (get_1284_register(pp, 6, &reg, GFP_KERNEL))
300		return -EIO;
301	return 0;
302}
303
304/*
305 * Clear TIMEOUT BIT in EPP MODE
306 */
307static int clear_epp_timeout(struct parport *pp)
308{
309	unsigned char stat;
310
311	if (get_1284_register(pp, 1, &stat, GFP_KERNEL))
312		return 1;
313	return stat & 1;
314}
315
316/*
317 * Access functions.
318 */
319#if 0
320static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
321{
322	struct parport *pp = (struct parport *)dev_id;
323	struct parport_uss720_private *priv = pp->private_data;	
324
325	if (usbstatus != 0 || len < 4 || !buffer)
326		return 1;
327	memcpy(priv->reg, buffer, 4);
328	/* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
329	if (priv->reg[2] & priv->reg[1] & 0x10)
330		parport_generic_irq(pp);
331	return 1;
332}
333#endif
334
335static void parport_uss720_write_data(struct parport *pp, unsigned char d)
336{
337	set_1284_register(pp, 0, d, GFP_KERNEL);
338}
339
340static unsigned char parport_uss720_read_data(struct parport *pp)
341{
342	unsigned char ret;
343
344	if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
345		return 0;
346	return ret;
347}
348
349static void parport_uss720_write_control(struct parport *pp, unsigned char d)
350{
351	struct parport_uss720_private *priv = pp->private_data;	
352
353	d = (d & 0xf) | (priv->reg[1] & 0xf0);
354	if (set_1284_register(pp, 2, d, GFP_KERNEL))
355		return;
356	priv->reg[1] = d;
357}
358
359static unsigned char parport_uss720_read_control(struct parport *pp)
360{
361	struct parport_uss720_private *priv = pp->private_data;	
362	return priv->reg[1] & 0xf; /* Use soft copy */
363}
364
365static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
366{
367	struct parport_uss720_private *priv = pp->private_data;	
368	unsigned char d;
369
370	mask &= 0x0f;
371	val &= 0x0f;
372	d = (priv->reg[1] & (~mask)) ^ val;
373	if (set_1284_register(pp, 2, d, GFP_ATOMIC))
374		return 0;
375	priv->reg[1] = d;
376	return d & 0xf;
377}
378
379static unsigned char parport_uss720_read_status(struct parport *pp)
380{
381	unsigned char ret;
382
383	if (get_1284_register(pp, 1, &ret, GFP_ATOMIC))
384		return 0;
385	return ret & 0xf8;
386}
387
388static void parport_uss720_disable_irq(struct parport *pp)
389{
390	struct parport_uss720_private *priv = pp->private_data;	
391	unsigned char d;
392
393	d = priv->reg[1] & ~0x10;
394	if (set_1284_register(pp, 2, d, GFP_KERNEL))
395		return;
396	priv->reg[1] = d;
397}
398
399static void parport_uss720_enable_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
410static void parport_uss720_data_forward (struct parport *pp)
411{
412	struct parport_uss720_private *priv = pp->private_data;	
413	unsigned char d;
414
415	d = priv->reg[1] & ~0x20;
416	if (set_1284_register(pp, 2, d, GFP_KERNEL))
417		return;
418	priv->reg[1] = d;
419}
420
421static void parport_uss720_data_reverse (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
432static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
433{
434	s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
435	s->u.pc.ecr = 0x24;
436}
437
438static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
439{
440	struct parport_uss720_private *priv = pp->private_data;	
441
442#if 0
443	if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
444		return;
445#endif
446	s->u.pc.ctr = priv->reg[1];
447	s->u.pc.ecr = priv->reg[2];
448}
449
450static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
451{
452	struct parport_uss720_private *priv = pp->private_data;
453
454	set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
455	set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
456	get_1284_register(pp, 2, NULL, GFP_ATOMIC);
457	priv->reg[1] = s->u.pc.ctr;
458	priv->reg[2] = s->u.pc.ecr;
459}
460
461static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
462{
463	struct parport_uss720_private *priv = pp->private_data;	
464	size_t got = 0;
465
466	if (change_mode(pp, ECR_EPP))
467		return 0;
468	for (; got < length; got++) {
469		if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
470			break;
471		buf++;
472		if (priv->reg[0] & 0x01) {
473			clear_epp_timeout(pp);
474			break;
475		}
476	}
477	change_mode(pp, ECR_PS2);
478	return got;
479}
480
481static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
482{
483#if 0
484	struct parport_uss720_private *priv = pp->private_data;	
485	size_t written = 0;
486
487	if (change_mode(pp, ECR_EPP))
488		return 0;
489	for (; written < length; written++) {
490		if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
491			break;
492		((char*)buf)++;
493		if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
494			break;
495		if (priv->reg[0] & 0x01) {
496			clear_epp_timeout(pp);
497			break;
498		}
499	}
500	change_mode(pp, ECR_PS2);
501	return written;
502#else
503	struct parport_uss720_private *priv = pp->private_data;
504	struct usb_device *usbdev = priv->usbdev;
505	int rlen = 0;
506	int i;
507
508	if (!usbdev)
509		return 0;
510	if (change_mode(pp, ECR_EPP))
511		return 0;
512	i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
513	if (i)
514		printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buf, length, rlen);
515	change_mode(pp, ECR_PS2);
516	return rlen;
517#endif
518}
519
520static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
521{
522	struct parport_uss720_private *priv = pp->private_data;	
523	size_t got = 0;
524
525	if (change_mode(pp, ECR_EPP))
526		return 0;
527	for (; got < length; got++) {
528		if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
529			break;
530		buf++;
531		if (priv->reg[0] & 0x01) {
532			clear_epp_timeout(pp);
533			break;
534		}
535	}
536	change_mode(pp, ECR_PS2);
537	return got;
538}
539
540static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
541{
542	struct parport_uss720_private *priv = pp->private_data;	
543	size_t written = 0;
544
545	if (change_mode(pp, ECR_EPP))
546		return 0;
547	for (; written < length; written++) {
548		if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
549			break;
550		buf++;
551		if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
552			break;
553		if (priv->reg[0] & 0x01) {
554			clear_epp_timeout(pp);
555			break;
556		}
557	}
558	change_mode(pp, ECR_PS2);
559	return written;
560}
561
562static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
563{
564	struct parport_uss720_private *priv = pp->private_data;
565	struct usb_device *usbdev = priv->usbdev;
566	int rlen = 0;
567	int i;
568
569	if (!usbdev)
570		return 0;
571	if (change_mode(pp, ECR_ECP))
572		return 0;
573	i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
574	if (i)
575		printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen);
576	change_mode(pp, ECR_PS2);
577	return rlen;
578}
579
580static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
581{
582	struct parport_uss720_private *priv = pp->private_data;
583	struct usb_device *usbdev = priv->usbdev;
584	int rlen = 0;
585	int i;
586
587	if (!usbdev)
588		return 0;
589	if (change_mode(pp, ECR_ECP))
590		return 0;
591	i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
592	if (i)
593		printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %zu rlen %u\n", buffer, len, rlen);
594	change_mode(pp, ECR_PS2);
595	return rlen;
596}
597
598static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
599{
600	size_t written = 0;
601
602	if (change_mode(pp, ECR_ECP))
603		return 0;
604	for (; written < len; written++) {
605		if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
606			break;
607		buffer++;
608	}
609	change_mode(pp, ECR_PS2);
610	return written;
611}
612
613static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
614{
615	struct parport_uss720_private *priv = pp->private_data;
616	struct usb_device *usbdev = priv->usbdev;
617	int rlen = 0;
618	int i;
619
620	if (!usbdev)
621		return 0;
622	if (change_mode(pp, ECR_PPF))
623		return 0;
624	i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
625	if (i)
626		printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %zu rlen %u\n", buffer, len, rlen);
627	change_mode(pp, ECR_PS2);
628	return rlen;
629}
630
631/* --------------------------------------------------------------------- */
632
633static struct parport_operations parport_uss720_ops = 
634{
635	.owner =		THIS_MODULE,
636	.write_data =		parport_uss720_write_data,
637	.read_data =		parport_uss720_read_data,
638
639	.write_control =	parport_uss720_write_control,
640	.read_control =		parport_uss720_read_control,
641	.frob_control =		parport_uss720_frob_control,
642
643	.read_status =		parport_uss720_read_status,
644
645	.enable_irq =		parport_uss720_enable_irq,
646	.disable_irq =		parport_uss720_disable_irq,
647
648	.data_forward =		parport_uss720_data_forward,
649	.data_reverse =		parport_uss720_data_reverse,
650
651	.init_state =		parport_uss720_init_state,
652	.save_state =		parport_uss720_save_state,
653	.restore_state =	parport_uss720_restore_state,
654
655	.epp_write_data =	parport_uss720_epp_write_data,
656	.epp_read_data =	parport_uss720_epp_read_data,
657	.epp_write_addr =	parport_uss720_epp_write_addr,
658	.epp_read_addr =	parport_uss720_epp_read_addr,
659
660	.ecp_write_data =	parport_uss720_ecp_write_data,
661	.ecp_read_data =	parport_uss720_ecp_read_data,
662	.ecp_write_addr =	parport_uss720_ecp_write_addr,
663
664	.compat_write_data =	parport_uss720_write_compat,
665	.nibble_read_data =	parport_ieee1284_read_nibble,
666	.byte_read_data =	parport_ieee1284_read_byte,
667};
668
669/* --------------------------------------------------------------------- */
670
671static int uss720_probe(struct usb_interface *intf,
672			const struct usb_device_id *id)
673{
674	struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
675	struct usb_host_interface *interface;
676	struct usb_endpoint_descriptor *epd;
677	struct parport_uss720_private *priv;
678	struct parport *pp;
679	unsigned char reg;
680	int i;
681
682	dev_dbg(&intf->dev, "probe: vendor id 0x%x, device id 0x%x\n",
683		le16_to_cpu(usbdev->descriptor.idVendor),
684		le16_to_cpu(usbdev->descriptor.idProduct));
685
686	/* our known interfaces have 3 alternate settings */
687	if (intf->num_altsetting != 3) {
688		usb_put_dev(usbdev);
689		return -ENODEV;
690	}
691	i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
692	dev_dbg(&intf->dev, "set interface result %d\n", i);
693
694	interface = intf->cur_altsetting;
695
696	if (interface->desc.bNumEndpoints < 3) {
697		usb_put_dev(usbdev);
698		return -ENODEV;
699	}
700
701	/*
702	 * Allocate parport interface 
703	 */
704	priv = kzalloc(sizeof(struct parport_uss720_private), GFP_KERNEL);
705	if (!priv) {
706		usb_put_dev(usbdev);
707		return -ENOMEM;
708	}
709	priv->pp = NULL;
710	priv->usbdev = usbdev;
711	kref_init(&priv->ref_count);
712	spin_lock_init(&priv->asynclock);
713	INIT_LIST_HEAD(&priv->asynclist);
714	pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops);
715	if (!pp) {
716		printk(KERN_WARNING "uss720: could not register parport\n");
717		goto probe_abort;
718	}
719
720	priv->pp = pp;
721	pp->private_data = priv;
722	pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;
723
724	/* set the USS720 control register to manual mode, no ECP compression, enable all ints */
725	set_1284_register(pp, 7, 0x00, GFP_KERNEL);
726	set_1284_register(pp, 6, 0x30, GFP_KERNEL);  /* PS/2 mode */
727	set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
728	/* debugging */
729	get_1284_register(pp, 0, &reg, GFP_KERNEL);
730	dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg);
731
732	i = usb_find_last_int_in_endpoint(interface, &epd);
733	if (!i) {
734		dev_dbg(&intf->dev, "epaddr %d interval %d\n",
735				epd->bEndpointAddress, epd->bInterval);
736	}
737	parport_announce_port(pp);
738
739	usb_set_intfdata(intf, pp);
740	return 0;
741
742probe_abort:
743	kill_all_async_requests_priv(priv);
744	kref_put(&priv->ref_count, destroy_priv);
745	return -ENODEV;
746}
747
748static void uss720_disconnect(struct usb_interface *intf)
749{
750	struct parport *pp = usb_get_intfdata(intf);
751	struct parport_uss720_private *priv;
752
753	dev_dbg(&intf->dev, "disconnect\n");
754	usb_set_intfdata(intf, NULL);
755	if (pp) {
756		priv = pp->private_data;
 
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/* --------------------------------------------------------------------- */