aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb/misc/rio500.c
blob: cc13ae61712a2a81915e6f0582ecc174ac8c90ed (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
/* -*- linux-c -*- */

/* 
 * Driver for USB Rio 500
 *
 * Cesar Miquel (miquel@df.uba.ar)
 * 
 * based on hp_scanner.c by David E. Nelson (dnelson@jump.net)
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Based upon mouse.c (Brad Keryan) and printer.c (Michael Gee).
 *
 * Changelog:
 * 30/05/2003  replaced lock/unlock kernel with up/down
 *             Daniele Bellucci  bellucda@tiscali.it
 * */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/mutex.h>
#include <linux/errno.h>
#include <linux/random.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/usb.h>
#include <linux/wait.h>

#include "rio500_usb.h"

/*
 * Version Information
 */
#define DRIVER_VERSION "v1.1"
#define DRIVER_AUTHOR "Cesar Miquel <miquel@df.uba.ar>"
#define DRIVER_DESC "USB Rio 500 driver"

#define RIO_MINOR	64

/* stall/wait timeout for rio */
#define NAK_TIMEOUT (HZ)

#define IBUF_SIZE 0x1000

/* Size of the rio buffer */
#define OBUF_SIZE 0x10000

struct rio_usb_data {
        struct usb_device *rio_dev;     /* init: probe_rio */
        unsigned int ifnum;             /* Interface number of the USB device */
        int isopen;                     /* nz if open */
        int present;                    /* Device is present on the bus */
        char *obuf, *ibuf;              /* transfer buffers */
        char bulk_in_ep, bulk_out_ep;   /* Endpoint assignments */
        wait_queue_head_t wait_q;       /* for timeouts */
	struct mutex lock;          /* general race avoidance */
};

static DEFINE_MUTEX(rio500_mutex);
static struct rio_usb_data rio_instance;

static int open_rio(struct inode *inode, struct file *file)
{
	struct rio_usb_data *rio = &rio_instance;

	/* against disconnect() */
	mutex_lock(&rio500_mutex);
	mutex_lock(&(rio->lock));

	if (rio->isopen || !rio->present) {
		mutex_unlock(&(rio->lock));
		mutex_unlock(&rio500_mutex);
		return -EBUSY;
	}
	rio->isopen = 1;

	init_waitqueue_head(&rio->wait_q);

	mutex_unlock(&(rio->lock));

	dev_info(&rio->rio_dev->dev, "Rio opened.\n");
	mutex_unlock(&rio500_mutex);

	return 0;
}

static int close_rio(struct inode *inode, struct file *file)
{
	struct rio_usb_data *rio = &rio_instance;

	rio->isopen = 0;

	dev_info(&rio->rio_dev->dev, "Rio closed.\n");
	return 0;
}

static long ioctl_rio(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct RioCommand rio_cmd;
	struct rio_usb_data *rio = &rio_instance;
	void __user *data;
	unsigned char *buffer;
	int result, requesttype;
	int retries;
	int retval=0;

	mutex_lock(&(rio->lock));
        /* Sanity check to make sure rio is connected, powered, etc */
        if (rio->present == 0 || rio->rio_dev == NULL) {
		retval = -ENODEV;
		goto err_out;
	}

	switch (cmd) {
	case RIO_RECV_COMMAND:
		data = (void __user *) arg;
		if (data == NULL)
			break;
		if (copy_from_user(&rio_cmd, data, sizeof(struct RioCommand))) {
			retval = -EFAULT;
			goto err_out;
		}
		if (rio_cmd.length < 0 || rio_cmd.length > PAGE_SIZE) {
			retval = -EINVAL;
			goto err_out;
		}
		buffer = (unsigned char *) __get_free_page(GFP_KERNEL);
		if (buffer == NULL) {
			retval = -ENOMEM;
			goto err_out;
		}
		if (copy_from_user(buffer, rio_cmd.buffer, rio_cmd.length)) {
			retval = -EFAULT;
			free_page((unsigned long) buffer);
			goto err_out;
		}

		requesttype = rio_cmd.requesttype | USB_DIR_IN |
		    USB_TYPE_VENDOR | USB_RECIP_DEVICE;
		dbg
		    ("sending command:reqtype=%0x req=%0x value=%0x index=%0x len=%0x",
		     requesttype, rio_cmd.request, rio_cmd.value,
		     rio_cmd.index, rio_cmd.length);
		/* Send rio control message */
		retries = 3;
		while (retries) {
			result = usb_control_msg(rio->rio_dev,
						 usb_rcvctrlpipe(rio-> rio_dev, 0),
						 rio_cmd.request,
						 requesttype,
						 rio_cmd.value,
						 rio_cmd.index, buffer,
						 rio_cmd.length,
						 jiffies_to_msecs(rio_cmd.timeout));
			if (result == -ETIMEDOUT)
				retries--;
			else if (result < 0) {
				err("Error executing ioctrl. code = %d", result);
				retries = 0;
			} else {
				dbg("Executed ioctl. Result = %d (data=%02x)",
				     result, buffer[0]);
				if (copy_to_user(rio_cmd.buffer, buffer,
						 rio_cmd.length)) {
					free_page((unsigned long) buffer);
					retval = -EFAULT;
					goto err_out;
				}
				retries = 0;
			}

			/* rio_cmd.buffer contains a raw stream of single byte
			   data which has been returned from rio.  Data is
			   interpreted at application level.  For data that
			   will be cast to data types longer than 1 byte, data
			   will be little_endian and will potentially need to
			   be swapped at the app level */

		}
		free_page((unsigned long) buffer);
		break;

	case RIO_SEND_COMMAND:
		data = (void __user *) arg;
		if (data == NULL)
			break;
		if (copy_from_user(&rio_cmd, data, sizeof(struct RioCommand))) {
			retval = -EFAULT;
			goto err_out;
		}
		if (rio_cmd.length < 0 || rio_cmd.length > PAGE_SIZE) {
			retval = -EINVAL;
			goto err_out;
		}
		buffer = (unsigned char *) __get_free_page(GFP_KERNEL);
		if (buffer == NULL) {
			retval = -ENOMEM;
			goto err_out;
		}
		if (copy_from_user(buffer, rio_cmd.buffer, rio_cmd.length)) {
			free_page((unsigned long)buffer);
			retval = -EFAULT;
			goto err_out;
		}

		requesttype = rio_cmd.requesttype | USB_DIR_OUT |
		    USB_TYPE_VENDOR | USB_RECIP_DEVICE;
		dbg("sending command: reqtype=%0x req=%0x value=%0x index=%0x len=%0x",
		     requesttype, rio_cmd.request, rio_cmd.value,
		     rio_cmd.index, rio_cmd.length);
		/* Send rio control message */
		retries = 3;
		while (retries) {
			result = usb_control_msg(rio->rio_dev,
						 usb_sndctrlpipe(rio-> rio_dev, 0),
						 rio_cmd.request,
						 requesttype,
						 rio_cmd.value,
						 rio_cmd.index, buffer,
						 rio_cmd.length,
						 jiffies_to_msecs(rio_cmd.timeout));
			if (result == -ETIMEDOUT)
				retries--;
			else if (result < 0) {
				err("Error executing ioctrl. code = %d", result);
				retries = 0;
			} else {
				dbg("Executed ioctl. Result = %d", result);
				retries = 0;

			}

		}
		free_page((unsigned long) buffer);
		break;

	default:
		retval = -ENOTTY;
		break;
	}


err_out:
	mutex_unlock(&(rio->lock));
	return retval;
}

static ssize_t
write_rio(struct file *file, const char __user *buffer,
	  size_t count, loff_t * ppos)
{
	DEFINE_WAIT(wait);
	struct rio_usb_data *rio = &rio_instance;

	unsigned long copy_size;
	unsigned long bytes_written = 0;
	unsigned int partial;

	int result = 0;
	int maxretry;
	int errn = 0;
	int intr;

	intr = mutex_lock_interruptible(&(rio->lock));
	if (intr)
		return -EINTR;
        /* Sanity check to make sure rio is connected, powered, etc */
        if (rio->present == 0 || rio->rio_dev == NULL) {
		mutex_unlock(&(rio->lock));
		return -ENODEV;
	}



	do {
		unsigned long thistime;
		char *obuf = rio->obuf;

		thistime = copy_size =
		    (count >= OBUF_SIZE) ? OBUF_SIZE : count;
		if (copy_from_user(rio->obuf, buffer, copy_size)) {
			errn = -EFAULT;
			goto error;
		}
		maxretry = 5;
		while (thistime) {
			if (!rio->rio_dev) {
				errn = -ENODEV;
				goto error;
			}
			if (signal_pending(current)) {
				mutex_unlock(&(rio->lock));
				return bytes_written ? bytes_written : -EINTR;
			}

			result = usb_bulk_msg(rio->rio_dev,
					 usb_sndbulkpipe(rio->rio_dev, 2),
					 obuf, thistime, &partial, 5000);

			dbg("write stats: result:%d thistime:%lu partial:%u",
			     result, thistime, partial);

			if (result == -ETIMEDOUT) {	/* NAK - so hold for a while */
				if (!maxretry--) {
					errn = -ETIME;
					goto error;
				}
				prepare_to_wait(&rio->wait_q, &wait, TASK_INTERRUPTIBLE);
				schedule_timeout(NAK_TIMEOUT);
				finish_wait(&rio->wait_q, &wait);
				continue;
			} else if (!result && partial) {
				obuf += partial;
				thistime -= partial;
			} else
				break;
		};
		if (result) {
			err("Write Whoops - %x", result);
			errn = -EIO;
			goto error;
		}
		bytes_written += copy_size;
		count -= copy_size;
		buffer += copy_size;
	} while (count > 0);

	mutex_unlock(&(rio->lock));

	return bytes_written ? bytes_written : -EIO;

error:
	mutex_unlock(&(rio->lock));
	return errn;
}

static ssize_t
read_rio(struct file *file, char __user *buffer, size_t count, loff_t * ppos)
{
	DEFINE_WAIT(wait);
	struct rio_usb_data *rio = &rio_instance;
	ssize_t read_count;
	unsigned int partial;
	int this_read;
	int result;
	int maxretry = 10;
	char *ibuf;
	int intr;

	intr = mutex_lock_interruptible(&(rio->lock));
	if (intr)
		return -EINTR;
	/* Sanity check to make sure rio is connected, powered, etc */
        if (rio->present == 0 || rio->rio_dev == NULL) {
		mutex_unlock(&(rio->lock));
		return -ENODEV;
	}

	ibuf = rio->ibuf;

	read_count = 0;


	while (count > 0) {
		if (signal_pending(current)) {
			mutex_unlock(&(rio->lock));
			return read_count ? read_count : -EINTR;
		}
		if (!rio->rio_dev) {
			mutex_unlock(&(rio->lock));
			return -ENODEV;
		}
		this_read = (count >= IBUF_SIZE) ? IBUF_SIZE : count;

		result = usb_bulk_msg(rio->rio_dev,
				      usb_rcvbulkpipe(rio->rio_dev, 1),
				      ibuf, this_read, &partial,
				      8000);

		dbg("read stats: result:%d this_read:%u partial:%u",
		       result, this_read, partial);

		if (partial) {
			count = this_read = partial;
		} else if (result == -ETIMEDOUT || result == 15) {	/* FIXME: 15 ??? */
			if (!maxretry--) {
				mutex_unlock(&(rio->lock));
				err("read_rio: maxretry timeout");
				return -ETIME;
			}
			prepare_to_wait(&rio->wait_q, &wait, TASK_INTERRUPTIBLE);
			schedule_timeout(NAK_TIMEOUT);
			finish_wait(&rio->wait_q, &wait);
			continue;
		} else if (result != -EREMOTEIO) {
			mutex_unlock(&(rio->lock));
			err("Read Whoops - result:%u partial:%u this_read:%u",
			     result, partial, this_read);
			return -EIO;
		} else {
			mutex_unlock(&(rio->lock));
			return (0);
		}

		if (this_read) {
			if (copy_to_user(buffer, ibuf, this_read)) {
				mutex_unlock(&(rio->lock));
				return -EFAULT;
			}
			count -= this_read;
			read_count += this_read;
			buffer += this_read;
		}
	}
	mutex_unlock(&(rio->lock));
	return read_count;
}

static const struct file_operations usb_rio_fops = {
	.owner =	THIS_MODULE,
	.read =		read_rio,
	.write =	write_rio,
	.unlocked_ioctl = ioctl_rio,
	.open =		open_rio,
	.release =	close_rio,
};

static struct usb_class_driver usb_rio_class = {
	.name =		"rio500%d",
	.fops =		&usb_rio_fops,
	.minor_base =	RIO_MINOR,
};

static int probe_rio(struct usb_interface *intf,
		     const struct usb_device_id *id)
{
	struct usb_device *dev = interface_to_usbdev(intf);
	struct rio_usb_data *rio = &rio_instance;
	int retval;

	dev_info(&intf->dev, "USB Rio found at address %d\n", dev->devnum);

	retval = usb_register_dev(intf, &usb_rio_class);
	if (retval) {
		err("Not able to get a minor for this device.");
		return -ENOMEM;
	}

	rio->rio_dev = dev;

	if (!(rio->obuf = kmalloc(OBUF_SIZE, GFP_KERNEL))) {
		err("probe_rio: Not enough memory for the output buffer");
		usb_deregister_dev(intf, &usb_rio_class);
		return -ENOMEM;
	}
	dbg("probe_rio: obuf address:%p", rio->obuf);

	if (!(rio->ibuf = kmalloc(IBUF_SIZE, GFP_KERNEL))) {
		err("probe_rio: Not enough memory for the input buffer");
		usb_deregister_dev(intf, &usb_rio_class);
		kfree(rio->obuf);
		return -ENOMEM;
	}
	dbg("probe_rio: ibuf address:%p", rio->ibuf);

	mutex_init(&(rio->lock));

	usb_set_intfdata (intf, rio);
	rio->present = 1;

	return 0;
}

static void disconnect_rio(struct usb_interface *intf)
{
	struct rio_usb_data *rio = usb_get_intfdata (intf);

	usb_set_intfdata (intf, NULL);
	mutex_lock(&rio500_mutex);
	if (rio) {
		usb_deregister_dev(intf, &usb_rio_class);

		mutex_lock(&(rio->lock));
		if (rio->isopen) {
			rio->isopen = 0;
			/* better let it finish - the release will do whats needed */
			rio->rio_dev = NULL;
			mutex_unlock(&(rio->lock));
			mutex_unlock(&rio500_mutex);
			return;
		}
		kfree(rio->ibuf);
		kfree(rio->obuf);

		dev_info(&intf->dev, "USB Rio disconnected.\n");

		rio->present = 0;
		mutex_unlock(&(rio->lock));
	}
	mutex_unlock(&rio500_mutex);
}

static const struct usb_device_id rio_table[] = {
	{ USB_DEVICE(0x0841, 1) }, 		/* Rio 500 */
	{ }					/* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, rio_table);

static struct usb_driver rio_driver = {
	.name =		"rio500",
	.probe =	probe_rio,
	.disconnect =	disconnect_rio,
	.id_table =	rio_table,
};

static int __init usb_rio_init(void)
{
	int retval;
	retval = usb_register(&rio_driver);
	if (retval)
		goto out;

	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
	       DRIVER_DESC "\n");

out:
	return retval;
}


static void __exit usb_rio_cleanup(void)
{
	struct rio_usb_data *rio = &rio_instance;

	rio->present = 0;
	usb_deregister(&rio_driver);


}

module_init(usb_rio_init);
module_exit(usb_rio_cleanup);

MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL");