1// SPDX-License-Identifier: GPL-2.0-only
2#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
3
4#include <media/drv-intf/saa7146_vv.h>
5#include <linux/module.h>
6
7/****************************************************************************/
8/* resource management functions, shamelessly stolen from saa7134 driver */
9
10int saa7146_res_get(struct saa7146_dev *dev, unsigned int bit)
11{
12	struct saa7146_vv *vv = dev->vv_data;
13
14	if (vv->resources & bit) {
15		DEB_D("already allocated! want: 0x%02x, cur:0x%02x\n",
16		      bit, vv->resources);
17		/* have it already allocated */
18		return 1;
19	}
20
21	/* is it free? */
22	if (vv->resources & bit) {
23		DEB_D("locked! vv->resources:0x%02x, we want:0x%02x\n",
24		      vv->resources, bit);
25		/* no, someone else uses it */
26		return 0;
27	}
28	/* it's free, grab it */
29	vv->resources |= bit;
30	DEB_D("res: get 0x%02x, cur:0x%02x\n", bit, vv->resources);
31	return 1;
32}
33
34void saa7146_res_free(struct saa7146_dev *dev, unsigned int bits)
35{
36	struct saa7146_vv *vv = dev->vv_data;
37
38	WARN_ON((vv->resources & bits) != bits);
39
40	vv->resources &= ~bits;
41	DEB_D("res: put 0x%02x, cur:0x%02x\n", bits, vv->resources);
42}
43
44
45/********************************************************************************/
46/* common buffer functions */
47
48int saa7146_buffer_queue(struct saa7146_dev *dev,
49			 struct saa7146_dmaqueue *q,
50			 struct saa7146_buf *buf)
51{
52	assert_spin_locked(&dev->slock);
53	DEB_EE("dev:%p, dmaq:%p, buf:%p\n", dev, q, buf);
54
55	if (WARN_ON(!q))
56		return -EIO;
57
58	if (NULL == q->curr) {
59		q->curr = buf;
60		DEB_D("immediately activating buffer %p\n", buf);
61		buf->activate(dev,buf,NULL);
62	} else {
63		list_add_tail(&buf->list, &q->queue);
64		DEB_D("adding buffer %p to queue. (active buffer present)\n",
65		      buf);
66	}
67	return 0;
68}
69
70void saa7146_buffer_finish(struct saa7146_dev *dev,
71			   struct saa7146_dmaqueue *q,
72			   int state)
73{
74	struct saa7146_vv *vv = dev->vv_data;
75	struct saa7146_buf *buf = q->curr;
76
77	assert_spin_locked(&dev->slock);
78	DEB_EE("dev:%p, dmaq:%p, state:%d\n", dev, q, state);
79	DEB_EE("q->curr:%p\n", q->curr);
80
81	/* finish current buffer */
82	if (!buf) {
83		DEB_D("aiii. no current buffer\n");
84		return;
85	}
86
87	q->curr = NULL;
88	buf->vb.vb2_buf.timestamp = ktime_get_ns();
89	if (vv->video_fmt.field == V4L2_FIELD_ALTERNATE)
90		buf->vb.field = vv->last_field;
91	else if (vv->video_fmt.field == V4L2_FIELD_ANY)
92		buf->vb.field = (vv->video_fmt.height > vv->standard->v_max_out / 2)
93			? V4L2_FIELD_INTERLACED
94			: V4L2_FIELD_BOTTOM;
95	else
96		buf->vb.field = vv->video_fmt.field;
97	buf->vb.sequence = vv->seqnr++;
98	vb2_buffer_done(&buf->vb.vb2_buf, state);
99}
100
101void saa7146_buffer_next(struct saa7146_dev *dev,
102			 struct saa7146_dmaqueue *q, int vbi)
103{
104	struct saa7146_buf *buf,*next = NULL;
105
106	if (WARN_ON(!q))
107		return;
108
109	DEB_INT("dev:%p, dmaq:%p, vbi:%d\n", dev, q, vbi);
110
111	assert_spin_locked(&dev->slock);
112	if (!list_empty(&q->queue)) {
113		/* activate next one from queue */
114		buf = list_entry(q->queue.next, struct saa7146_buf, list);
115		list_del(&buf->list);
116		if (!list_empty(&q->queue))
117			next = list_entry(q->queue.next, struct saa7146_buf, list);
118		q->curr = buf;
119		DEB_INT("next buffer: buf:%p, prev:%p, next:%p\n",
120			buf, q->queue.prev, q->queue.next);
121		buf->activate(dev,buf,next);
122	} else {
123		DEB_INT("no next buffer. stopping.\n");
124		if( 0 != vbi ) {
125			/* turn off video-dma3 */
126			saa7146_write(dev,MC1, MASK_20);
127		} else {
128			/* nothing to do -- just prevent next video-dma1 transfer
129			   by lowering the protection address */
130
131			// fixme: fix this for vflip != 0
132
133			saa7146_write(dev, PROT_ADDR1, 0);
134			saa7146_write(dev, MC2, (MASK_02|MASK_18));
135
136			/* write the address of the rps-program */
137			saa7146_write(dev, RPS_ADDR0, dev->d_rps0.dma_handle);
138			/* turn on rps */
139			saa7146_write(dev, MC1, (MASK_12 | MASK_28));
140
141/*
142			printk("vdma%d.base_even:     0x%08x\n", 1,saa7146_read(dev,BASE_EVEN1));
143			printk("vdma%d.base_odd:      0x%08x\n", 1,saa7146_read(dev,BASE_ODD1));
144			printk("vdma%d.prot_addr:     0x%08x\n", 1,saa7146_read(dev,PROT_ADDR1));
145			printk("vdma%d.base_page:     0x%08x\n", 1,saa7146_read(dev,BASE_PAGE1));
146			printk("vdma%d.pitch:         0x%08x\n", 1,saa7146_read(dev,PITCH1));
147			printk("vdma%d.num_line_byte: 0x%08x\n", 1,saa7146_read(dev,NUM_LINE_BYTE1));
148*/
149		}
150		del_timer(&q->timeout);
151	}
152}
153
154void saa7146_buffer_timeout(struct timer_list *t)
155{
156	struct saa7146_dmaqueue *q = from_timer(q, t, timeout);
157	struct saa7146_dev *dev = q->dev;
158	unsigned long flags;
159
160	DEB_EE("dev:%p, dmaq:%p\n", dev, q);
161
162	spin_lock_irqsave(&dev->slock,flags);
163	if (q->curr) {
164		DEB_D("timeout on %p\n", q->curr);
165		saa7146_buffer_finish(dev, q, VB2_BUF_STATE_ERROR);
166	}
167
168	/* we don't restart the transfer here like other drivers do. when
169	   a streaming capture is disabled, the timeout function will be
170	   called for the current buffer. if we activate the next buffer now,
171	   we mess up our capture logic. if a timeout occurs on another buffer,
172	   then something is seriously broken before, so no need to buffer the
173	   next capture IMHO... */
174
175	saa7146_buffer_next(dev, q, 0);
176
177	spin_unlock_irqrestore(&dev->slock,flags);
178}
179
180/********************************************************************************/
181/* file operations */
182
183static ssize_t fops_write(struct file *file, const char __user *data, size_t count, loff_t *ppos)
184{
185	struct video_device *vdev = video_devdata(file);
186	struct saa7146_dev *dev = video_drvdata(file);
187	int ret;
188
189	if (vdev->vfl_type != VFL_TYPE_VBI || !dev->ext_vv_data->vbi_fops.write)
190		return -EINVAL;
191	if (mutex_lock_interruptible(vdev->lock))
192		return -ERESTARTSYS;
193	ret = dev->ext_vv_data->vbi_fops.write(file, data, count, ppos);
194	mutex_unlock(vdev->lock);
195	return ret;
196}
197
198static const struct v4l2_file_operations video_fops =
199{
200	.owner		= THIS_MODULE,
201	.open		= v4l2_fh_open,
202	.release	= vb2_fop_release,
203	.read		= vb2_fop_read,
204	.write		= fops_write,
205	.poll		= vb2_fop_poll,
206	.mmap		= vb2_fop_mmap,
207	.unlocked_ioctl	= video_ioctl2,
208};
209
210static void vv_callback(struct saa7146_dev *dev, unsigned long status)
211{
212	u32 isr = status;
213
214	DEB_INT("dev:%p, isr:0x%08x\n", dev, (u32)status);
215
216	if (0 != (isr & (MASK_27))) {
217		DEB_INT("irq: RPS0 (0x%08x)\n", isr);
218		saa7146_video_uops.irq_done(dev,isr);
219	}
220
221	if (0 != (isr & (MASK_28))) {
222		u32 mc2 = saa7146_read(dev, MC2);
223		if( 0 != (mc2 & MASK_15)) {
224			DEB_INT("irq: RPS1 vbi workaround (0x%08x)\n", isr);
225			wake_up(&dev->vv_data->vbi_wq);
226			saa7146_write(dev,MC2, MASK_31);
227			return;
228		}
229		DEB_INT("irq: RPS1 (0x%08x)\n", isr);
230		saa7146_vbi_uops.irq_done(dev,isr);
231	}
232}
233
234static const struct v4l2_ctrl_ops saa7146_ctrl_ops = {
235	.s_ctrl = saa7146_s_ctrl,
236};
237
238int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
239{
240	struct v4l2_ctrl_handler *hdl = &dev->ctrl_handler;
241	struct v4l2_pix_format *fmt;
242	struct v4l2_vbi_format *vbi;
243	struct saa7146_vv *vv;
244	int err;
245
246	err = v4l2_device_register(&dev->pci->dev, &dev->v4l2_dev);
247	if (err)
248		return err;
249
250	v4l2_ctrl_handler_init(hdl, 6);
251	v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
252		V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
253	v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
254		V4L2_CID_CONTRAST, 0, 127, 1, 64);
255	v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
256		V4L2_CID_SATURATION, 0, 127, 1, 64);
257	v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
258		V4L2_CID_VFLIP, 0, 1, 1, 0);
259	v4l2_ctrl_new_std(hdl, &saa7146_ctrl_ops,
260		V4L2_CID_HFLIP, 0, 1, 1, 0);
261	if (hdl->error) {
262		err = hdl->error;
263		v4l2_ctrl_handler_free(hdl);
264		v4l2_device_unregister(&dev->v4l2_dev);
265		return err;
266	}
267	dev->v4l2_dev.ctrl_handler = hdl;
268
269	vv = kzalloc(sizeof(struct saa7146_vv), GFP_KERNEL);
270	if (vv == NULL) {
271		ERR("out of memory. aborting.\n");
272		v4l2_ctrl_handler_free(hdl);
273		v4l2_device_unregister(&dev->v4l2_dev);
274		return -ENOMEM;
275	}
276	ext_vv->vid_ops = saa7146_video_ioctl_ops;
277	ext_vv->vbi_ops = saa7146_vbi_ioctl_ops;
278	ext_vv->core_ops = &saa7146_video_ioctl_ops;
279
280	DEB_EE("dev:%p\n", dev);
281
282	/* set default values for video parts of the saa7146 */
283	saa7146_write(dev, BCS_CTRL, 0x80400040);
284
285	/* enable video-port pins */
286	saa7146_write(dev, MC1, (MASK_10 | MASK_26));
287
288	/* save per-device extension data (one extension can
289	   handle different devices that might need different
290	   configuration data) */
291	dev->ext_vv_data = ext_vv;
292
293	saa7146_video_uops.init(dev,vv);
294	if (dev->ext_vv_data->capabilities & V4L2_CAP_VBI_CAPTURE)
295		saa7146_vbi_uops.init(dev,vv);
296
297	fmt = &vv->video_fmt;
298	fmt->width = 384;
299	fmt->height = 288;
300	fmt->pixelformat = V4L2_PIX_FMT_BGR24;
301	fmt->field = V4L2_FIELD_INTERLACED;
302	fmt->colorspace = V4L2_COLORSPACE_SMPTE170M;
303	fmt->bytesperline = 3 * fmt->width;
304	fmt->sizeimage = fmt->bytesperline * fmt->height;
305
306	vbi = &vv->vbi_fmt;
307	vbi->sampling_rate	= 27000000;
308	vbi->offset		= 248; /* todo */
309	vbi->samples_per_line	= 720 * 2;
310	vbi->sample_format	= V4L2_PIX_FMT_GREY;
311
312	/* fixme: this only works for PAL */
313	vbi->start[0] = 5;
314	vbi->count[0] = 16;
315	vbi->start[1] = 312;
316	vbi->count[1] = 16;
317
318	timer_setup(&vv->vbi_read_timeout, NULL, 0);
319
320	dev->vv_data = vv;
321	dev->vv_callback = &vv_callback;
322
323	return 0;
324}
325EXPORT_SYMBOL_GPL(saa7146_vv_init);
326
327int saa7146_vv_release(struct saa7146_dev* dev)
328{
329	struct saa7146_vv *vv = dev->vv_data;
330
331	DEB_EE("dev:%p\n", dev);
332
333	v4l2_device_unregister(&dev->v4l2_dev);
334	v4l2_ctrl_handler_free(&dev->ctrl_handler);
335	kfree(vv);
336	dev->vv_data = NULL;
337	dev->vv_callback = NULL;
338
339	return 0;
340}
341EXPORT_SYMBOL_GPL(saa7146_vv_release);
342
343int saa7146_register_device(struct video_device *vfd, struct saa7146_dev *dev,
344			    char *name, int type)
345{
346	struct vb2_queue *q;
347	int err;
348	int i;
349
350	DEB_EE("dev:%p, name:'%s', type:%d\n", dev, name, type);
351
352	vfd->fops = &video_fops;
353	if (type == VFL_TYPE_VIDEO) {
354		vfd->ioctl_ops = &dev->ext_vv_data->vid_ops;
355		q = &dev->vv_data->video_dmaq.q;
356	} else {
357		vfd->ioctl_ops = &dev->ext_vv_data->vbi_ops;
358		q = &dev->vv_data->vbi_dmaq.q;
359	}
360	vfd->release = video_device_release_empty;
361	vfd->lock = &dev->v4l2_lock;
362	vfd->v4l2_dev = &dev->v4l2_dev;
363	vfd->tvnorms = 0;
364	for (i = 0; i < dev->ext_vv_data->num_stds; i++)
365		vfd->tvnorms |= dev->ext_vv_data->stds[i].id;
366	strscpy(vfd->name, name, sizeof(vfd->name));
367	vfd->device_caps = V4L2_CAP_VIDEO_CAPTURE |
368			   V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
369	vfd->device_caps |= dev->ext_vv_data->capabilities;
370	if (type == VFL_TYPE_VIDEO) {
371		vfd->device_caps &=
372			~(V4L2_CAP_VBI_CAPTURE | V4L2_CAP_SLICED_VBI_OUTPUT);
373	} else if (vfd->device_caps & V4L2_CAP_SLICED_VBI_OUTPUT) {
374		vfd->vfl_dir = VFL_DIR_TX;
375		vfd->device_caps &= ~(V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
376				      V4L2_CAP_AUDIO | V4L2_CAP_TUNER);
377	} else {
378		vfd->device_caps &= ~V4L2_CAP_VIDEO_CAPTURE;
379	}
380
381	q->type = type == VFL_TYPE_VIDEO ? V4L2_BUF_TYPE_VIDEO_CAPTURE : V4L2_BUF_TYPE_VBI_CAPTURE;
382	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
383	q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
384	q->ops = type == VFL_TYPE_VIDEO ? &video_qops : &vbi_qops;
385	q->mem_ops = &vb2_dma_sg_memops;
386	q->drv_priv = dev;
387	q->gfp_flags = __GFP_DMA32;
388	q->buf_struct_size = sizeof(struct saa7146_buf);
389	q->lock = &dev->v4l2_lock;
390	q->min_queued_buffers = 2;
391	q->dev = &dev->pci->dev;
392	err = vb2_queue_init(q);
393	if (err)
394		return err;
395	vfd->queue = q;
396
397	video_set_drvdata(vfd, dev);
398
399	err = video_register_device(vfd, type, -1);
400	if (err < 0) {
401		ERR("cannot register v4l2 device. skipping.\n");
402		return err;
403	}
404
405	pr_info("%s: registered device %s [v4l2]\n",
406		dev->name, video_device_node_name(vfd));
407	return 0;
408}
409EXPORT_SYMBOL_GPL(saa7146_register_device);
410
411int saa7146_unregister_device(struct video_device *vfd, struct saa7146_dev *dev)
412{
413	DEB_EE("dev:%p\n", dev);
414
415	video_unregister_device(vfd);
416	return 0;
417}
418EXPORT_SYMBOL_GPL(saa7146_unregister_device);
419
420static int __init saa7146_vv_init_module(void)
421{
422	return 0;
423}
424
425
426static void __exit saa7146_vv_cleanup_module(void)
427{
428}
429
430module_init(saa7146_vv_init_module);
431module_exit(saa7146_vv_cleanup_module);
432
433MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
434MODULE_DESCRIPTION("video4linux driver for saa7146-based hardware");
435MODULE_LICENSE("GPL");
436