summaryrefslogtreecommitdiff
path: root/drivers/media/common/saa7146_fops.c
blob: 09ec964dec5c07742e4afa923c80f7f360762a07 (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
#include <media/saa7146_vv.h>

#define BOARD_CAN_DO_VBI(dev)   (dev->revision != 0 && dev->vv_data->vbi_minor != -1)

/****************************************************************************/
/* resource management functions, shamelessly stolen from saa7134 driver */

int saa7146_res_get(struct saa7146_fh *fh, unsigned int bit)
{
	struct saa7146_dev *dev = fh->dev;
	struct saa7146_vv *vv = dev->vv_data;

	if (fh->resources & bit) {
		DEB_D(("already allocated! want: 0x%02x, cur:0x%02x\n",bit,vv->resources));
		/* have it already allocated */
		return 1;
	}

	/* is it free? */
	down(&dev->lock);
	if (vv->resources & bit) {
		DEB_D(("locked! vv->resources:0x%02x, we want:0x%02x\n",vv->resources,bit));
		/* no, someone else uses it */
		up(&dev->lock);
		return 0;
	}
	/* it's free, grab it */
	fh->resources  |= bit;
	vv->resources |= bit;
	DEB_D(("res: get 0x%02x, cur:0x%02x\n",bit,vv->resources));
	up(&dev->lock);
	return 1;
}

void saa7146_res_free(struct saa7146_fh *fh, unsigned int bits)
{
	struct saa7146_dev *dev = fh->dev;
	struct saa7146_vv *vv = dev->vv_data;

	if ((fh->resources & bits) != bits)
		BUG();

	down(&dev->lock);
	fh->resources  &= ~bits;
	vv->resources &= ~bits;
	DEB_D(("res: put 0x%02x, cur:0x%02x\n",bits,vv->resources));
	up(&dev->lock);
}


/********************************************************************************/
/* common dma functions */

void saa7146_dma_free(struct saa7146_dev *dev,struct saa7146_buf *buf)
{
	DEB_EE(("dev:%p, buf:%p\n",dev,buf));

	if (in_interrupt())
		BUG();

	videobuf_waiton(&buf->vb,0,0);
	videobuf_dma_pci_unmap(dev->pci, &buf->vb.dma);
	videobuf_dma_free(&buf->vb.dma);
	buf->vb.state = STATE_NEEDS_INIT;
}


/********************************************************************************/
/* common buffer functions */

int saa7146_buffer_queue(struct saa7146_dev *dev,
			 struct saa7146_dmaqueue *q,
			 struct saa7146_buf *buf)
{
	assert_spin_locked(&dev->slock);
	DEB_EE(("dev:%p, dmaq:%p, buf:%p\n", dev, q, buf));

	BUG_ON(!q);

	if (NULL == q->curr) {
		q->curr = buf;
		DEB_D(("immediately activating buffer %p\n", buf));
		buf->activate(dev,buf,NULL);
	} else {
		list_add_tail(&buf->vb.queue,&q->queue);
		buf->vb.state = STATE_QUEUED;
		DEB_D(("adding buffer %p to queue. (active buffer present)\n", buf));
	}
	return 0;
}

void saa7146_buffer_finish(struct saa7146_dev *dev,
			   struct saa7146_dmaqueue *q,
			   int state)
{
	assert_spin_locked(&dev->slock);
	DEB_EE(("dev:%p, dmaq:%p, state:%d\n", dev, q, state));
	DEB_EE(("q->curr:%p\n",q->curr));

	BUG_ON(!q->curr);

	/* finish current buffer */
	if (NULL == q->curr) {
		DEB_D(("aiii. no current buffer\n"));
		return;
	}

	q->curr->vb.state = state;
	do_gettimeofday(&q->curr->vb.ts);
	wake_up(&q->curr->vb.done);

	q->curr = NULL;
}

void saa7146_buffer_next(struct saa7146_dev *dev,
			 struct saa7146_dmaqueue *q, int vbi)
{
	struct saa7146_buf *buf,*next = NULL;

	BUG_ON(!q);

	DEB_INT(("dev:%p, dmaq:%p, vbi:%d\n", dev, q, vbi));

	assert_spin_locked(&dev->slock);
	if (!list_empty(&q->queue)) {
		/* activate next one from queue */
		buf = list_entry(q->queue.next,struct saa7146_buf,vb.queue);
		list_del(&buf->vb.queue);
		if (!list_empty(&q->queue))
			next = list_entry(q->queue.next,struct saa7146_buf, vb.queue);
		q->curr = buf;
		DEB_INT(("next buffer: buf:%p, prev:%p, next:%p\n", buf, q->queue.prev,q->queue.next));
		buf->activate(dev,buf,next);
	} else {
		DEB_INT(("no next buffer. stopping.\n"));
		if( 0 != vbi ) {
			/* turn off video-dma3 */
			saa7146_write(dev,MC1, MASK_20);
		} else {
			/* nothing to do -- just prevent next video-dma1 transfer
			   by lowering the protection address */

			// fixme: fix this for vflip != 0

			saa7146_write(dev, PROT_ADDR1, 0);
			saa7146_write(dev, MC2, (MASK_02|MASK_18));

			/* write the address of the rps-program */
			saa7146_write(dev, RPS_ADDR0, dev->d_rps0.dma_handle);
			/* turn on rps */
			saa7146_write(dev, MC1, (MASK_12 | MASK_28));

/*
			printk("vdma%d.base_even:     0x%08x\n", 1,saa7146_read(dev,BASE_EVEN1));
			printk("vdma%d.base_odd:      0x%08x\n", 1,saa7146_read(dev,BASE_ODD1));
			printk("vdma%d.prot_addr:     0x%08x\n", 1,saa7146_read(dev,PROT_ADDR1));
			printk("vdma%d.base_page:     0x%08x\n", 1,saa7146_read(dev,BASE_PAGE1));
			printk("vdma%d.pitch:         0x%08x\n", 1,saa7146_read(dev,PITCH1));
			printk("vdma%d.num_line_byte: 0x%08x\n", 1,saa7146_read(dev,NUM_LINE_BYTE1));
*/
		}
		del_timer(&q->timeout);
	}
}

void saa7146_buffer_timeout(unsigned long data)
{
	struct saa7146_dmaqueue *q = (struct saa7146_dmaqueue*)data;
	struct saa7146_dev *dev = q->dev;
	unsigned long flags;

	DEB_EE(("dev:%p, dmaq:%p\n", dev, q));

	spin_lock_irqsave(&dev->slock,flags);
	if (q->curr) {
		DEB_D(("timeout on %p\n", q->curr));
		saa7146_buffer_finish(dev,q,STATE_ERROR);
	}

	/* we don't restart the transfer here like other drivers do. when
	   a streaming capture is disabled, the timeout function will be
	   called for the current buffer. if we activate the next buffer now,
	   we mess up our capture logic. if a timeout occurs on another buffer,
	   then something is seriously broken before, so no need to buffer the
	   next capture IMHO... */
/*
	saa7146_buffer_next(dev,q);
*/
	spin_unlock_irqrestore(&dev->slock,flags);
}

/********************************************************************************/
/* file operations */

static int fops_open(struct inode *inode, struct file *file)
{
	unsigned int minor = iminor(inode);
	struct saa7146_dev *h = NULL, *dev = NULL;
	struct list_head *list;
	struct saa7146_fh *fh = NULL;
	int result = 0;

	enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

	DEB_EE(("inode:%p, file:%p, minor:%d\n",inode,file,minor));

	if (down_interruptible(&saa7146_devices_lock))
		return -ERESTARTSYS;

	list_for_each(list,&saa7146_devices) {
		h = list_entry(list, struct saa7146_dev, item);
		if( NULL == h->vv_data ) {
			DEB_D(("device %p has not registered video devices.\n",h));
			continue;
		}
		DEB_D(("trying: %p @ major %d,%d\n",h,h->vv_data->video_minor,h->vv_data->vbi_minor));

		if (h->vv_data->video_minor == minor) {
			dev = h;
		}
		if (h->vv_data->vbi_minor == minor) {
			type = V4L2_BUF_TYPE_VBI_CAPTURE;
			dev = h;
		}
	}
	if (NULL == dev) {
		DEB_S(("no such video device.\n"));
		result = -ENODEV;
		goto out;
	}

	DEB_D(("using: %p\n",dev));

	/* check if an extension is registered */
	if( NULL == dev->ext ) {
		DEB_S(("no extension registered for this device.\n"));
		result = -ENODEV;
		goto out;
	}

	/* allocate per open data */
	fh = kmalloc(sizeof(*fh),GFP_KERNEL);
	if (NULL == fh) {
		DEB_S(("cannot allocate memory for per open data.\n"));
		result = -ENOMEM;
		goto out;
	}
	memset(fh,0,sizeof(*fh));

	file->private_data = fh;
	fh->dev = dev;
	fh->type = type;

	if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
		DEB_S(("initializing vbi...\n"));
		result = saa7146_vbi_uops.open(dev,file);
	} else {
		DEB_S(("initializing video...\n"));
		result = saa7146_video_uops.open(dev,file);
	}

	if (0 != result) {
		goto out;
	}

	if( 0 == try_module_get(dev->ext->module)) {
		result = -EINVAL;
		goto out;
	}

	result = 0;
out:
	if( fh != 0 && result != 0 ) {
		kfree(fh);
		file->private_data = NULL;
	}
	up(&saa7146_devices_lock);
	return result;
}

static int fops_release(struct inode *inode, struct file *file)
{
	struct saa7146_fh  *fh  = file->private_data;
	struct saa7146_dev *dev = fh->dev;

	DEB_EE(("inode:%p, file:%p\n",inode,file));

	if (down_interruptible(&saa7146_devices_lock))
		return -ERESTARTSYS;

	if( fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
		saa7146_vbi_uops.release(dev,file);
	} else {
		saa7146_video_uops.release(dev,file);
	}

	module_put(dev->ext->module);
	file->private_data = NULL;
	kfree(fh);

	up(&saa7146_devices_lock);

	return 0;
}

int saa7146_video_do_ioctl(struct inode *inode, struct file *file, unsigned int cmd, void *arg);
static int fops_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
/*
	DEB_EE(("inode:%p, file:%p, cmd:%d, arg:%li\n",inode, file, cmd, arg));
*/
	return video_usercopy(inode, file, cmd, arg, saa7146_video_do_ioctl);
}

static int fops_mmap(struct file *file, struct vm_area_struct * vma)
{
	struct saa7146_fh *fh = file->private_data;
	struct videobuf_queue *q;

	switch (fh->type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
		DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, vma:%p\n",file, vma));
		q = &fh->video_q;
		break;
		}
	case V4L2_BUF_TYPE_VBI_CAPTURE: {
		DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, vma:%p\n",file, vma));
		q = &fh->vbi_q;
		break;
		}
	default:
		BUG();
		return 0;
	}
	return videobuf_mmap_mapper(q,vma);
}

static unsigned int fops_poll(struct file *file, struct poll_table_struct *wait)
{
	struct saa7146_fh *fh = file->private_data;
	struct videobuf_buffer *buf = NULL;
	struct videobuf_queue *q;

	DEB_EE(("file:%p, poll:%p\n",file, wait));

	if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) {
		if( 0 == fh->vbi_q.streaming )
			return videobuf_poll_stream(file, &fh->vbi_q, wait);
		q = &fh->vbi_q;
	} else {
		DEB_D(("using video queue.\n"));
		q = &fh->video_q;
	}

	if (!list_empty(&q->stream))
		buf = list_entry(q->stream.next, struct videobuf_buffer, stream);

	if (!buf) {
		DEB_D(("buf == NULL!\n"));
		return POLLERR;
	}

	poll_wait(file, &buf->done, wait);
	if (buf->state == STATE_DONE || buf->state == STATE_ERROR) {
		DEB_D(("poll succeeded!\n"));
		return POLLIN|POLLRDNORM;
	}

	DEB_D(("nothing to poll for, buf->state:%d\n",buf->state));
	return 0;
}

static ssize_t fops_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
{
	struct saa7146_fh *fh = file->private_data;

	switch (fh->type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
//		DEB_EE(("V4L2_BUF_TYPE_VIDEO_CAPTURE: file:%p, data:%p, count:%lun", file, data, (unsigned long)count));
		return saa7146_video_uops.read(file,data,count,ppos);
		}
	case V4L2_BUF_TYPE_VBI_CAPTURE: {
//		DEB_EE(("V4L2_BUF_TYPE_VBI_CAPTURE: file:%p, data:%p, count:%lu\n", file, data, (unsigned long)count));
		return saa7146_vbi_uops.read(file,data,count,ppos);
		}
		break;
	default:
		BUG();
		return 0;
	}
}

static struct file_operations video_fops =
{
	.owner		= THIS_MODULE,
	.open		= fops_open,
	.release	= fops_release,
	.read		= fops_read,
	.poll		= fops_poll,
	.mmap		= fops_mmap,
	.ioctl		= fops_ioctl,
	.llseek		= no_llseek,
};

static void vv_callback(struct saa7146_dev *dev, unsigned long status)
{
	u32 isr = status;

	DEB_INT(("dev:%p, isr:0x%08x\n",dev,(u32)status));

	if (0 != (isr & (MASK_27))) {
		DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
		saa7146_video_uops.irq_done(dev,isr);
	}

	if (0 != (isr & (MASK_28))) {
		u32 mc2 = saa7146_read(dev, MC2);
		if( 0 != (mc2 & MASK_15)) {
			DEB_INT(("irq: RPS1 vbi workaround (0x%08x).\n",isr));
			wake_up(&dev->vv_data->vbi_wq);
			saa7146_write(dev,MC2, MASK_31);
			return;
		}
		DEB_INT(("irq: RPS1 (0x%08x).\n",isr));
		saa7146_vbi_uops.irq_done(dev,isr);
	}
}

static struct video_device device_template =
{
	.hardware	= VID_HARDWARE_SAA7146,
	.fops		= &video_fops,
	.minor		= -1,
};

int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
{
	struct saa7146_vv *vv = kmalloc (sizeof(struct saa7146_vv),GFP_KERNEL);
	if( NULL == vv ) {
		ERR(("out of memory. aborting.\n"));
		return -1;
	}
	memset(vv, 0x0, sizeof(*vv));

	DEB_EE(("dev:%p\n",dev));

	/* set default values for video parts of the saa7146 */
	saa7146_write(dev, BCS_CTRL, 0x80400040);

	/* enable video-port pins */
	saa7146_write(dev, MC1, (MASK_10 | MASK_26));

	/* save per-device extension data (one extension can
	   handle different devices that might need different
	   configuration data) */
	dev->ext_vv_data = ext_vv;

	vv->video_minor = -1;
	vv->vbi_minor = -1;

	vv->d_clipping.cpu_addr = pci_alloc_consistent(dev->pci, SAA7146_CLIPPING_MEM, &vv->d_clipping.dma_handle);
	if( NULL == vv->d_clipping.cpu_addr ) {
		ERR(("out of memory. aborting.\n"));
		kfree(vv);
		return -1;
	}
	memset(vv->d_clipping.cpu_addr, 0x0, SAA7146_CLIPPING_MEM);

	saa7146_video_uops.init(dev,vv);
	saa7146_vbi_uops.init(dev,vv);

	dev->vv_data = vv;
	dev->vv_callback = &vv_callback;

	return 0;
}

int saa7146_vv_release(struct saa7146_dev* dev)
{
	struct saa7146_vv *vv = dev->vv_data;

	DEB_EE(("dev:%p\n",dev));

	pci_free_consistent(dev->pci, SAA7146_RPS_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
	kfree(vv);
	dev->vv_data = NULL;
	dev->vv_callback = NULL;

	return 0;
}

int saa7146_register_device(struct video_device **vid, struct saa7146_dev* dev,
			    char *name, int type)
{
	struct saa7146_vv *vv = dev->vv_data;
	struct video_device *vfd;

	DEB_EE(("dev:%p, name:'%s', type:%d\n",dev,name,type));

	// released by vfd->release
	vfd = video_device_alloc();
	if (vfd == NULL)
		return -ENOMEM;

	memcpy(vfd, &device_template, sizeof(struct video_device));
	strlcpy(vfd->name, name, sizeof(vfd->name));
	vfd->release = video_device_release;
	vfd->priv = dev;

	// fixme: -1 should be an insmod parameter *for the extension* (like "video_nr");
	if (video_register_device(vfd, type, -1) < 0) {
		ERR(("cannot register v4l2 device. skipping.\n"));
		return -1;
	}

	if( VFL_TYPE_GRABBER == type ) {
		vv->video_minor = vfd->minor;
		INFO(("%s: registered device video%d [v4l2]\n",
			dev->name, vfd->minor & 0x1f));
	} else {
		vv->vbi_minor = vfd->minor;
		INFO(("%s: registered device vbi%d [v4l2]\n",
			dev->name, vfd->minor & 0x1f));
	}

	*vid = vfd;
	return 0;
}

int saa7146_unregister_device(struct video_device **vid, struct saa7146_dev* dev)
{
	struct saa7146_vv *vv = dev->vv_data;

	DEB_EE(("dev:%p\n",dev));

	if( VFL_TYPE_GRABBER == (*vid)->type ) {
		vv->video_minor = -1;
	} else {
		vv->vbi_minor = -1;
	}

	video_unregister_device(*vid);
	*vid = NULL;

	return 0;
}

static int __init saa7146_vv_init_module(void)
{
	return 0;
}


static void __exit saa7146_vv_cleanup_module(void)
{
}

module_init(saa7146_vv_init_module);
module_exit(saa7146_vv_cleanup_module);

MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
MODULE_LICENSE("GPL");