1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2005-2006 Micronas USA Inc.
4  */
5 
6 #include <linux/module.h>
7 #include <linux/delay.h>
8 #include <linux/sched.h>
9 #include <linux/spinlock.h>
10 #include <linux/unistd.h>
11 #include <linux/time.h>
12 #include <linux/mm.h>
13 #include <linux/vmalloc.h>
14 #include <linux/device.h>
15 #include <linux/i2c.h>
16 #include <linux/firmware.h>
17 #include <linux/mutex.h>
18 #include <linux/uaccess.h>
19 #include <linux/slab.h>
20 #include <linux/videodev2.h>
21 #include <media/tuner.h>
22 #include <media/v4l2-common.h>
23 #include <media/v4l2-event.h>
24 
25 #include "go7007-priv.h"
26 
27 /*
28  * Wait for an interrupt to be delivered from the GO7007SB and return
29  * the associated value and data.
30  *
31  * Must be called with the hw_lock held.
32  */
33 int go7007_read_interrupt(struct go7007 *go, u16 *value, u16 *data)
34 {
35 	go->interrupt_available = 0;
36 	go->hpi_ops->read_interrupt(go);
37 	if (wait_event_timeout(go->interrupt_waitq,
38 				go->interrupt_available, 5*HZ) < 0) {
39 		v4l2_err(&go->v4l2_dev, "timeout waiting for read interrupt\n");
40 		return -1;
41 	}
42 	if (!go->interrupt_available)
43 		return -1;
44 	go->interrupt_available = 0;
45 	*value = go->interrupt_value & 0xfffe;
46 	*data = go->interrupt_data;
47 	return 0;
48 }
49 EXPORT_SYMBOL(go7007_read_interrupt);
50 
51 /*
52  * Read a register/address on the GO7007SB.
53  *
54  * Must be called with the hw_lock held.
55  */
56 int go7007_read_addr(struct go7007 *go, u16 addr, u16 *data)
57 {
58 	int count = 100;
59 	u16 value;
60 
61 	if (go7007_write_interrupt(go, 0x0010, addr) < 0)
62 		return -EIO;
63 	while (count-- > 0) {
64 		if (go7007_read_interrupt(go, &value, data) == 0 &&
65 				value == 0xa000)
66 			return 0;
67 	}
68 	return -EIO;
69 }
70 EXPORT_SYMBOL(go7007_read_addr);
71 
72 /*
73  * Send the boot firmware to the encoder, which just wakes it up and lets
74  * us talk to the GPIO pins and on-board I2C adapter.
75  *
76  * Must be called with the hw_lock held.
77  */
78 static int go7007_load_encoder(struct go7007 *go)
79 {
80 	const struct firmware *fw_entry;
81 	char fw_name[] = "go7007/go7007fw.bin";
82 	void *bounce;
83 	int fw_len, rv = 0;
84 	u16 intr_val, intr_data;
85 
86 	if (go->boot_fw == NULL) {
87 		if (request_firmware(&fw_entry, fw_name, go->dev)) {
88 			v4l2_err(go, "unable to load firmware from file \"%s\"\n", fw_name);
89 			return -1;
90 		}
91 		if (fw_entry->size < 16 || memcmp(fw_entry->data, "WISGO7007FW", 11)) {
92 			v4l2_err(go, "file \"%s\" does not appear to be go7007 firmware\n", fw_name);
93 			release_firmware(fw_entry);
94 			return -1;
95 		}
96 		fw_len = fw_entry->size - 16;
97 		bounce = kmemdup(fw_entry->data + 16, fw_len, GFP_KERNEL);
98 		if (bounce == NULL) {
99 			v4l2_err(go, "unable to allocate %d bytes for firmware transfer\n", fw_len);
100 			release_firmware(fw_entry);
101 			return -1;
102 		}
103 		release_firmware(fw_entry);
104 		go->boot_fw_len = fw_len;
105 		go->boot_fw = bounce;
106 	}
107 	if (go7007_interface_reset(go) < 0 ||
108 	    go7007_send_firmware(go, go->boot_fw, go->boot_fw_len) < 0 ||
109 	    go7007_read_interrupt(go, &intr_val, &intr_data) < 0 ||
110 			(intr_val & ~0x1) != 0x5a5a) {
111 		v4l2_err(go, "error transferring firmware\n");
112 		rv = -1;
113 	}
114 	return rv;
115 }
116 
117 MODULE_FIRMWARE("go7007/go7007fw.bin");
118 
119 /*
120  * Boot the encoder and register the I2C adapter if requested.  Do the
121  * minimum initialization necessary, since the board-specific code may
122  * still need to probe the board ID.
123  *
124  * Must NOT be called with the hw_lock held.
125  */
126 int go7007_boot_encoder(struct go7007 *go, int init_i2c)
127 {
128 	int ret;
129 
130 	mutex_lock(&go->hw_lock);
131 	ret = go7007_load_encoder(go);
132 	mutex_unlock(&go->hw_lock);
133 	if (ret < 0)
134 		return -1;
135 	if (!init_i2c)
136 		return 0;
137 	if (go7007_i2c_init(go) < 0)
138 		return -1;
139 	go->i2c_adapter_online = 1;
140 	return 0;
141 }
142 EXPORT_SYMBOL(go7007_boot_encoder);
143 
144 /*
145  * Configure any hardware-related registers in the GO7007, such as GPIO
146  * pins and bus parameters, which are board-specific.  This assumes
147  * the boot firmware has already been downloaded.
148  *
149  * Must be called with the hw_lock held.
150  */
151 static int go7007_init_encoder(struct go7007 *go)
152 {
153 	if (go->board_info->audio_flags & GO7007_AUDIO_I2S_MASTER) {
154 		go7007_write_addr(go, 0x1000, 0x0811);
155 		go7007_write_addr(go, 0x1000, 0x0c11);
156 	}
157 	switch (go->board_id) {
158 	case GO7007_BOARDID_MATRIX_REV:
159 		/* Set GPIO pin 0 to be an output (audio clock control) */
160 		go7007_write_addr(go, 0x3c82, 0x0001);
161 		go7007_write_addr(go, 0x3c80, 0x00fe);
162 		break;
163 	case GO7007_BOARDID_ADLINK_MPG24:
164 		/* set GPIO5 to be an output, currently low */
165 		go7007_write_addr(go, 0x3c82, 0x0000);
166 		go7007_write_addr(go, 0x3c80, 0x00df);
167 		break;
168 	case GO7007_BOARDID_ADS_USBAV_709:
169 		/* GPIO pin 0: audio clock control */
170 		/*      pin 2: TW9906 reset */
171 		/*      pin 3: capture LED */
172 		go7007_write_addr(go, 0x3c82, 0x000d);
173 		go7007_write_addr(go, 0x3c80, 0x00f2);
174 		break;
175 	}
176 	return 0;
177 }
178 
179 /*
180  * Send the boot firmware to the GO7007 and configure the registers.  This
181  * is the only way to stop the encoder once it has started streaming video.
182  *
183  * Must be called with the hw_lock held.
184  */
185 int go7007_reset_encoder(struct go7007 *go)
186 {
187 	if (go7007_load_encoder(go) < 0)
188 		return -1;
189 	return go7007_init_encoder(go);
190 }
191 
192 /*
193  * Attempt to instantiate an I2C client by ID, probably loading a module.
194  */
195 static int init_i2c_module(struct i2c_adapter *adapter, const struct go_i2c *const i2c)
196 {
197 	struct go7007 *go = i2c_get_adapdata(adapter);
198 	struct v4l2_device *v4l2_dev = &go->v4l2_dev;
199 	struct v4l2_subdev *sd;
200 	struct i2c_board_info info;
201 
202 	memset(&info, 0, sizeof(info));
203 	strscpy(info.type, i2c->type, sizeof(info.type));
204 	info.addr = i2c->addr;
205 	info.flags = i2c->flags;
206 
207 	sd = v4l2_i2c_new_subdev_board(v4l2_dev, adapter, &info, NULL);
208 	if (sd) {
209 		if (i2c->is_video)
210 			go->sd_video = sd;
211 		if (i2c->is_audio)
212 			go->sd_audio = sd;
213 		return 0;
214 	}
215 
216 	pr_info("go7007: probing for module i2c:%s failed\n", i2c->type);
217 	return -EINVAL;
218 }
219 
220 /*
221  * Detach and unregister the encoder.  The go7007 struct won't be freed
222  * until v4l2 finishes releasing its resources and all associated fds are
223  * closed by applications.
224  */
225 static void go7007_remove(struct v4l2_device *v4l2_dev)
226 {
227 	struct go7007 *go = container_of(v4l2_dev, struct go7007, v4l2_dev);
228 
229 	v4l2_device_unregister(v4l2_dev);
230 	if (go->hpi_ops->release)
231 		go->hpi_ops->release(go);
232 	if (go->i2c_adapter_online) {
233 		i2c_del_adapter(&go->i2c_adapter);
234 		go->i2c_adapter_online = 0;
235 	}
236 
237 	kfree(go->boot_fw);
238 	go7007_v4l2_remove(go);
239 	kfree(go);
240 }
241 
242 /*
243  * Finalize the GO7007 hardware setup, register the on-board I2C adapter
244  * (if used on this board), load the I2C client driver for the sensor
245  * (SAA7115 or whatever) and other devices, and register the ALSA and V4L2
246  * interfaces.
247  *
248  * Must NOT be called with the hw_lock held.
249  */
250 int go7007_register_encoder(struct go7007 *go, unsigned num_i2c_devs)
251 {
252 	int i, ret;
253 
254 	dev_info(go->dev, "go7007: registering new %s\n", go->name);
255 
256 	go->v4l2_dev.release = go7007_remove;
257 	ret = v4l2_device_register(go->dev, &go->v4l2_dev);
258 	if (ret < 0)
259 		return ret;
260 
261 	mutex_lock(&go->hw_lock);
262 	ret = go7007_init_encoder(go);
263 	mutex_unlock(&go->hw_lock);
264 	if (ret < 0)
265 		return ret;
266 
267 	ret = go7007_v4l2_ctrl_init(go);
268 	if (ret < 0)
269 		return ret;
270 
271 	if (!go->i2c_adapter_online &&
272 			go->board_info->flags & GO7007_BOARD_USE_ONBOARD_I2C) {
273 		ret = go7007_i2c_init(go);
274 		if (ret < 0)
275 			return ret;
276 		go->i2c_adapter_online = 1;
277 	}
278 	if (go->i2c_adapter_online) {
279 		if (go->board_id == GO7007_BOARDID_ADS_USBAV_709) {
280 			/* Reset the TW9906 */
281 			go7007_write_addr(go, 0x3c82, 0x0009);
282 			msleep(50);
283 			go7007_write_addr(go, 0x3c82, 0x000d);
284 		}
285 		for (i = 0; i < num_i2c_devs; ++i)
286 			init_i2c_module(&go->i2c_adapter, &go->board_info->i2c_devs[i]);
287 
288 		if (go->tuner_type >= 0) {
289 			struct tuner_setup setup = {
290 				.addr = ADDR_UNSET,
291 				.type = go->tuner_type,
292 				.mode_mask = T_ANALOG_TV,
293 			};
294 
295 			v4l2_device_call_all(&go->v4l2_dev, 0, tuner,
296 				s_type_addr, &setup);
297 		}
298 		if (go->board_id == GO7007_BOARDID_ADLINK_MPG24)
299 			v4l2_subdev_call(go->sd_video, video, s_routing,
300 					0, 0, go->channel_number + 1);
301 	}
302 
303 	ret = go7007_v4l2_init(go);
304 	if (ret < 0)
305 		return ret;
306 
307 	if (go->board_info->flags & GO7007_BOARD_HAS_AUDIO) {
308 		go->audio_enabled = 1;
309 		go7007_snd_init(go);
310 	}
311 	return 0;
312 }
313 EXPORT_SYMBOL(go7007_register_encoder);
314 
315 /*
316  * Send the encode firmware to the encoder, which will cause it
317  * to immediately start delivering the video and audio streams.
318  *
319  * Must be called with the hw_lock held.
320  */
321 int go7007_start_encoder(struct go7007 *go)
322 {
323 	u8 *fw;
324 	int fw_len, rv = 0, i, x, y;
325 	u16 intr_val, intr_data;
326 
327 	go->modet_enable = 0;
328 	for (i = 0; i < 4; i++)
329 		go->modet[i].enable = 0;
330 
331 	switch (v4l2_ctrl_g_ctrl(go->modet_mode)) {
332 	case V4L2_DETECT_MD_MODE_GLOBAL:
333 		memset(go->modet_map, 0, sizeof(go->modet_map));
334 		go->modet[0].enable = 1;
335 		go->modet_enable = 1;
336 		break;
337 	case V4L2_DETECT_MD_MODE_REGION_GRID:
338 		for (y = 0; y < go->height / 16; y++) {
339 			for (x = 0; x < go->width / 16; x++) {
340 				int idx = y * go->width / 16 + x;
341 
342 				go->modet[go->modet_map[idx]].enable = 1;
343 			}
344 		}
345 		go->modet_enable = 1;
346 		break;
347 	}
348 
349 	if (go->dvd_mode)
350 		go->modet_enable = 0;
351 
352 	if (go7007_construct_fw_image(go, &fw, &fw_len) < 0)
353 		return -1;
354 
355 	if (go7007_send_firmware(go, fw, fw_len) < 0 ||
356 			go7007_read_interrupt(go, &intr_val, &intr_data) < 0) {
357 		v4l2_err(&go->v4l2_dev, "error transferring firmware\n");
358 		rv = -1;
359 		goto start_error;
360 	}
361 
362 	go->state = STATE_DATA;
363 	go->parse_length = 0;
364 	go->seen_frame = 0;
365 	if (go7007_stream_start(go) < 0) {
366 		v4l2_err(&go->v4l2_dev, "error starting stream transfer\n");
367 		rv = -1;
368 		goto start_error;
369 	}
370 
371 start_error:
372 	kfree(fw);
373 	return rv;
374 }
375 
376 /*
377  * Store a byte in the current video buffer, if there is one.
378  */
379 static inline void store_byte(struct go7007_buffer *vb, u8 byte)
380 {
381 	if (vb && vb->vb.vb2_buf.planes[0].bytesused < GO7007_BUF_SIZE) {
382 		u8 *ptr = vb2_plane_vaddr(&vb->vb.vb2_buf, 0);
383 
384 		ptr[vb->vb.vb2_buf.planes[0].bytesused++] = byte;
385 	}
386 }
387 
388 static void go7007_set_motion_regions(struct go7007 *go, struct go7007_buffer *vb,
389 		u32 motion_regions)
390 {
391 	if (motion_regions != go->modet_event_status) {
392 		struct v4l2_event ev = {
393 			.type = V4L2_EVENT_MOTION_DET,
394 			.u.motion_det = {
395 				.flags = V4L2_EVENT_MD_FL_HAVE_FRAME_SEQ,
396 				.frame_sequence = vb->vb.sequence,
397 				.region_mask = motion_regions,
398 			},
399 		};
400 
401 		v4l2_event_queue(&go->vdev, &ev);
402 		go->modet_event_status = motion_regions;
403 	}
404 }
405 
406 /*
407  * Determine regions with motion and send a motion detection event
408  * in case of changes.
409  */
410 static void go7007_motion_regions(struct go7007 *go, struct go7007_buffer *vb)
411 {
412 	u32 *bytesused = &vb->vb.vb2_buf.planes[0].bytesused;
413 	unsigned motion[4] = { 0, 0, 0, 0 };
414 	u32 motion_regions = 0;
415 	unsigned stride = (go->width + 7) >> 3;
416 	unsigned x, y;
417 	int i;
418 
419 	for (i = 0; i < 216; ++i)
420 		store_byte(vb, go->active_map[i]);
421 	for (y = 0; y < go->height / 16; y++) {
422 		for (x = 0; x < go->width / 16; x++) {
423 			if (!(go->active_map[y * stride + (x >> 3)] & (1 << (x & 7))))
424 				continue;
425 			motion[go->modet_map[y * (go->width / 16) + x]]++;
426 		}
427 	}
428 	motion_regions = ((motion[0] > 0) << 0) |
429 			 ((motion[1] > 0) << 1) |
430 			 ((motion[2] > 0) << 2) |
431 			 ((motion[3] > 0) << 3);
432 	*bytesused -= 216;
433 	go7007_set_motion_regions(go, vb, motion_regions);
434 }
435 
436 /*
437  * Deliver the last video buffer and get a new one to start writing to.
438  */
439 static struct go7007_buffer *frame_boundary(struct go7007 *go, struct go7007_buffer *vb)
440 {
441 	u32 *bytesused;
442 	struct go7007_buffer *vb_tmp = NULL;
443 	unsigned long flags;
444 
445 	if (vb == NULL) {
446 		spin_lock_irqsave(&go->spinlock, flags);
447 		if (!list_empty(&go->vidq_active))
448 			vb = go->active_buf =
449 				list_first_entry(&go->vidq_active, struct go7007_buffer, list);
450 		spin_unlock_irqrestore(&go->spinlock, flags);
451 		go->next_seq++;
452 		return vb;
453 	}
454 	bytesused = &vb->vb.vb2_buf.planes[0].bytesused;
455 
456 	vb->vb.sequence = go->next_seq++;
457 	if (vb->modet_active && *bytesused + 216 < GO7007_BUF_SIZE)
458 		go7007_motion_regions(go, vb);
459 	else
460 		go7007_set_motion_regions(go, vb, 0);
461 
462 	vb->vb.vb2_buf.timestamp = ktime_get_ns();
463 	vb_tmp = vb;
464 	spin_lock_irqsave(&go->spinlock, flags);
465 	list_del(&vb->list);
466 	if (list_empty(&go->vidq_active))
467 		vb = NULL;
468 	else
469 		vb = list_first_entry(&go->vidq_active,
470 				struct go7007_buffer, list);
471 	go->active_buf = vb;
472 	spin_unlock_irqrestore(&go->spinlock, flags);
473 	vb2_buffer_done(&vb_tmp->vb.vb2_buf, VB2_BUF_STATE_DONE);
474 	return vb;
475 }
476 
477 static void write_bitmap_word(struct go7007 *go)
478 {
479 	int x, y, i, stride = ((go->width >> 4) + 7) >> 3;
480 
481 	for (i = 0; i < 16; ++i) {
482 		y = (((go->parse_length - 1) << 3) + i) / (go->width >> 4);
483 		x = (((go->parse_length - 1) << 3) + i) % (go->width >> 4);
484 		if (stride * y + (x >> 3) < sizeof(go->active_map))
485 			go->active_map[stride * y + (x >> 3)] |=
486 					(go->modet_word & 1) << (x & 0x7);
487 		go->modet_word >>= 1;
488 	}
489 }
490 
491 /*
492  * Parse a chunk of the video stream into frames.  The frames are not
493  * delimited by the hardware, so we have to parse the frame boundaries
494  * based on the type of video stream we're receiving.
495  */
496 void go7007_parse_video_stream(struct go7007 *go, u8 *buf, int length)
497 {
498 	struct go7007_buffer *vb = go->active_buf;
499 	int i, seq_start_code = -1, gop_start_code = -1, frame_start_code = -1;
500 
501 	switch (go->format) {
502 	case V4L2_PIX_FMT_MPEG4:
503 		seq_start_code = 0xB0;
504 		gop_start_code = 0xB3;
505 		frame_start_code = 0xB6;
506 		break;
507 	case V4L2_PIX_FMT_MPEG1:
508 	case V4L2_PIX_FMT_MPEG2:
509 		seq_start_code = 0xB3;
510 		gop_start_code = 0xB8;
511 		frame_start_code = 0x00;
512 		break;
513 	}
514 
515 	for (i = 0; i < length; ++i) {
516 		if (vb && vb->vb.vb2_buf.planes[0].bytesused >=
517 				GO7007_BUF_SIZE - 3) {
518 			v4l2_info(&go->v4l2_dev, "dropping oversized frame\n");
519 			vb2_set_plane_payload(&vb->vb.vb2_buf, 0, 0);
520 			vb->frame_offset = 0;
521 			vb->modet_active = 0;
522 			vb = go->active_buf = NULL;
523 		}
524 
525 		switch (go->state) {
526 		case STATE_DATA:
527 			switch (buf[i]) {
528 			case 0x00:
529 				go->state = STATE_00;
530 				break;
531 			case 0xFF:
532 				go->state = STATE_FF;
533 				break;
534 			default:
535 				store_byte(vb, buf[i]);
536 				break;
537 			}
538 			break;
539 		case STATE_00:
540 			switch (buf[i]) {
541 			case 0x00:
542 				go->state = STATE_00_00;
543 				break;
544 			case 0xFF:
545 				store_byte(vb, 0x00);
546 				go->state = STATE_FF;
547 				break;
548 			default:
549 				store_byte(vb, 0x00);
550 				store_byte(vb, buf[i]);
551 				go->state = STATE_DATA;
552 				break;
553 			}
554 			break;
555 		case STATE_00_00:
556 			switch (buf[i]) {
557 			case 0x00:
558 				store_byte(vb, 0x00);
559 				/* go->state remains STATE_00_00 */
560 				break;
561 			case 0x01:
562 				go->state = STATE_00_00_01;
563 				break;
564 			case 0xFF:
565 				store_byte(vb, 0x00);
566 				store_byte(vb, 0x00);
567 				go->state = STATE_FF;
568 				break;
569 			default:
570 				store_byte(vb, 0x00);
571 				store_byte(vb, 0x00);
572 				store_byte(vb, buf[i]);
573 				go->state = STATE_DATA;
574 				break;
575 			}
576 			break;
577 		case STATE_00_00_01:
578 			if (buf[i] == 0xF8 && go->modet_enable == 0) {
579 				/* MODET start code, but MODET not enabled */
580 				store_byte(vb, 0x00);
581 				store_byte(vb, 0x00);
582 				store_byte(vb, 0x01);
583 				store_byte(vb, 0xF8);
584 				go->state = STATE_DATA;
585 				break;
586 			}
587 			/* If this is the start of a new MPEG frame,
588 			 * get a new buffer */
589 			if ((go->format == V4L2_PIX_FMT_MPEG1 ||
590 			     go->format == V4L2_PIX_FMT_MPEG2 ||
591 			     go->format == V4L2_PIX_FMT_MPEG4) &&
592 			    (buf[i] == seq_start_code ||
593 			     buf[i] == gop_start_code ||
594 			     buf[i] == frame_start_code)) {
595 				if (vb == NULL || go->seen_frame)
596 					vb = frame_boundary(go, vb);
597 				go->seen_frame = buf[i] == frame_start_code;
598 				if (vb && go->seen_frame)
599 					vb->frame_offset =
600 					vb->vb.vb2_buf.planes[0].bytesused;
601 			}
602 			/* Handle any special chunk types, or just write the
603 			 * start code to the (potentially new) buffer */
604 			switch (buf[i]) {
605 			case 0xF5: /* timestamp */
606 				go->parse_length = 12;
607 				go->state = STATE_UNPARSED;
608 				break;
609 			case 0xF6: /* vbi */
610 				go->state = STATE_VBI_LEN_A;
611 				break;
612 			case 0xF8: /* MD map */
613 				go->parse_length = 0;
614 				memset(go->active_map, 0,
615 						sizeof(go->active_map));
616 				go->state = STATE_MODET_MAP;
617 				break;
618 			case 0xFF: /* Potential JPEG start code */
619 				store_byte(vb, 0x00);
620 				store_byte(vb, 0x00);
621 				store_byte(vb, 0x01);
622 				go->state = STATE_FF;
623 				break;
624 			default:
625 				store_byte(vb, 0x00);
626 				store_byte(vb, 0x00);
627 				store_byte(vb, 0x01);
628 				store_byte(vb, buf[i]);
629 				go->state = STATE_DATA;
630 				break;
631 			}
632 			break;
633 		case STATE_FF:
634 			switch (buf[i]) {
635 			case 0x00:
636 				store_byte(vb, 0xFF);
637 				go->state = STATE_00;
638 				break;
639 			case 0xFF:
640 				store_byte(vb, 0xFF);
641 				/* go->state remains STATE_FF */
642 				break;
643 			case 0xD8:
644 				if (go->format == V4L2_PIX_FMT_MJPEG)
645 					vb = frame_boundary(go, vb);
646 				fallthrough;
647 			default:
648 				store_byte(vb, 0xFF);
649 				store_byte(vb, buf[i]);
650 				go->state = STATE_DATA;
651 				break;
652 			}
653 			break;
654 		case STATE_VBI_LEN_A:
655 			go->parse_length = buf[i] << 8;
656 			go->state = STATE_VBI_LEN_B;
657 			break;
658 		case STATE_VBI_LEN_B:
659 			go->parse_length |= buf[i];
660 			if (go->parse_length > 0)
661 				go->state = STATE_UNPARSED;
662 			else
663 				go->state = STATE_DATA;
664 			break;
665 		case STATE_MODET_MAP:
666 			if (go->parse_length < 204) {
667 				if (go->parse_length & 1) {
668 					go->modet_word |= buf[i];
669 					write_bitmap_word(go);
670 				} else
671 					go->modet_word = buf[i] << 8;
672 			} else if (go->parse_length == 207 && vb) {
673 				vb->modet_active = buf[i];
674 			}
675 			if (++go->parse_length == 208)
676 				go->state = STATE_DATA;
677 			break;
678 		case STATE_UNPARSED:
679 			if (--go->parse_length == 0)
680 				go->state = STATE_DATA;
681 			break;
682 		}
683 	}
684 }
685 EXPORT_SYMBOL(go7007_parse_video_stream);
686 
687 /*
688  * Allocate a new go7007 struct.  Used by the hardware-specific probe.
689  */
690 struct go7007 *go7007_alloc(const struct go7007_board_info *board,
691 						struct device *dev)
692 {
693 	struct go7007 *go;
694 
695 	go = kzalloc(sizeof(struct go7007), GFP_KERNEL);
696 	if (go == NULL)
697 		return NULL;
698 	go->dev = dev;
699 	go->board_info = board;
700 	go->tuner_type = -1;
701 	mutex_init(&go->hw_lock);
702 	init_waitqueue_head(&go->frame_waitq);
703 	spin_lock_init(&go->spinlock);
704 	go->status = STATUS_INIT;
705 	init_waitqueue_head(&go->interrupt_waitq);
706 	go7007_update_board(go);
707 	go->format = V4L2_PIX_FMT_MJPEG;
708 	go->bitrate = 1500000;
709 	go->fps_scale = 1;
710 	go->aspect_ratio = GO7007_RATIO_1_1;
711 
712 	return go;
713 }
714 EXPORT_SYMBOL(go7007_alloc);
715 
716 void go7007_update_board(struct go7007 *go)
717 {
718 	const struct go7007_board_info *board = go->board_info;
719 
720 	if (board->sensor_flags & GO7007_SENSOR_TV) {
721 		go->standard = GO7007_STD_NTSC;
722 		go->std = V4L2_STD_NTSC_M;
723 		go->width = 720;
724 		go->height = 480;
725 		go->sensor_framerate = 30000;
726 	} else {
727 		go->standard = GO7007_STD_OTHER;
728 		go->width = board->sensor_width;
729 		go->height = board->sensor_height;
730 		go->sensor_framerate = board->sensor_framerate;
731 	}
732 	go->encoder_v_offset = board->sensor_v_offset;
733 	go->encoder_h_offset = board->sensor_h_offset;
734 }
735 EXPORT_SYMBOL(go7007_update_board);
736 
737 MODULE_LICENSE("GPL v2");
738