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;
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 		kfree(go->boot_fw);
113 		go->boot_fw = NULL;
114 		return -1;
115 	}
116 	return 0;
117 }
118 
119 MODULE_FIRMWARE("go7007/go7007fw.bin");
120 
121 /*
122  * Boot the encoder and register the I2C adapter if requested.  Do the
123  * minimum initialization necessary, since the board-specific code may
124  * still need to probe the board ID.
125  *
126  * Must NOT be called with the hw_lock held.
127  */
128 int go7007_boot_encoder(struct go7007 *go, int init_i2c)
129 {
130 	int ret;
131 
132 	mutex_lock(&go->hw_lock);
133 	ret = go7007_load_encoder(go);
134 	mutex_unlock(&go->hw_lock);
135 	if (ret < 0)
136 		return -1;
137 	if (!init_i2c)
138 		return 0;
139 	if (go7007_i2c_init(go) < 0)
140 		return -1;
141 	go->i2c_adapter_online = 1;
142 	return 0;
143 }
144 EXPORT_SYMBOL(go7007_boot_encoder);
145 
146 /*
147  * Configure any hardware-related registers in the GO7007, such as GPIO
148  * pins and bus parameters, which are board-specific.  This assumes
149  * the boot firmware has already been downloaded.
150  *
151  * Must be called with the hw_lock held.
152  */
153 static int go7007_init_encoder(struct go7007 *go)
154 {
155 	if (go->board_info->audio_flags & GO7007_AUDIO_I2S_MASTER) {
156 		go7007_write_addr(go, 0x1000, 0x0811);
157 		go7007_write_addr(go, 0x1000, 0x0c11);
158 	}
159 	switch (go->board_id) {
160 	case GO7007_BOARDID_MATRIX_REV:
161 		/* Set GPIO pin 0 to be an output (audio clock control) */
162 		go7007_write_addr(go, 0x3c82, 0x0001);
163 		go7007_write_addr(go, 0x3c80, 0x00fe);
164 		break;
165 	case GO7007_BOARDID_ADLINK_MPG24:
166 		/* set GPIO5 to be an output, currently low */
167 		go7007_write_addr(go, 0x3c82, 0x0000);
168 		go7007_write_addr(go, 0x3c80, 0x00df);
169 		break;
170 	case GO7007_BOARDID_ADS_USBAV_709:
171 		/* GPIO pin 0: audio clock control */
172 		/*      pin 2: TW9906 reset */
173 		/*      pin 3: capture LED */
174 		go7007_write_addr(go, 0x3c82, 0x000d);
175 		go7007_write_addr(go, 0x3c80, 0x00f2);
176 		break;
177 	}
178 	return 0;
179 }
180 
181 /*
182  * Send the boot firmware to the GO7007 and configure the registers.  This
183  * is the only way to stop the encoder once it has started streaming video.
184  *
185  * Must be called with the hw_lock held.
186  */
187 int go7007_reset_encoder(struct go7007 *go)
188 {
189 	if (go7007_load_encoder(go) < 0)
190 		return -1;
191 	return go7007_init_encoder(go);
192 }
193 
194 /*
195  * Attempt to instantiate an I2C client by ID, probably loading a module.
196  */
197 static int init_i2c_module(struct i2c_adapter *adapter, const struct go_i2c *const i2c)
198 {
199 	struct go7007 *go = i2c_get_adapdata(adapter);
200 	struct v4l2_device *v4l2_dev = &go->v4l2_dev;
201 	struct v4l2_subdev *sd;
202 	struct i2c_board_info info;
203 
204 	memset(&info, 0, sizeof(info));
205 	strscpy(info.type, i2c->type, sizeof(info.type));
206 	info.addr = i2c->addr;
207 	info.flags = i2c->flags;
208 
209 	sd = v4l2_i2c_new_subdev_board(v4l2_dev, adapter, &info, NULL);
210 	if (sd) {
211 		if (i2c->is_video)
212 			go->sd_video = sd;
213 		if (i2c->is_audio)
214 			go->sd_audio = sd;
215 		return 0;
216 	}
217 
218 	pr_info("go7007: probing for module i2c:%s failed\n", i2c->type);
219 	return -EINVAL;
220 }
221 
222 /*
223  * Detach and unregister the encoder.  The go7007 struct won't be freed
224  * until v4l2 finishes releasing its resources and all associated fds are
225  * closed by applications.
226  */
227 static void go7007_remove(struct v4l2_device *v4l2_dev)
228 {
229 	struct go7007 *go = container_of(v4l2_dev, struct go7007, v4l2_dev);
230 
231 	v4l2_device_unregister(v4l2_dev);
232 	if (go->hpi_ops->release)
233 		go->hpi_ops->release(go);
234 	if (go->i2c_adapter_online) {
235 		i2c_del_adapter(&go->i2c_adapter);
236 		go->i2c_adapter_online = 0;
237 	}
238 
239 	kfree(go->boot_fw);
240 	go7007_v4l2_remove(go);
241 	kfree(go);
242 }
243 
244 /*
245  * Finalize the GO7007 hardware setup, register the on-board I2C adapter
246  * (if used on this board), load the I2C client driver for the sensor
247  * (SAA7115 or whatever) and other devices, and register the ALSA and V4L2
248  * interfaces.
249  *
250  * Must NOT be called with the hw_lock held.
251  */
252 int go7007_register_encoder(struct go7007 *go, unsigned num_i2c_devs)
253 {
254 	int i, ret;
255 
256 	dev_info(go->dev, "go7007: registering new %s\n", go->name);
257 
258 	go->v4l2_dev.release = go7007_remove;
259 	ret = v4l2_device_register(go->dev, &go->v4l2_dev);
260 	if (ret < 0)
261 		return ret;
262 
263 	mutex_lock(&go->hw_lock);
264 	ret = go7007_init_encoder(go);
265 	mutex_unlock(&go->hw_lock);
266 	if (ret < 0)
267 		return ret;
268 
269 	ret = go7007_v4l2_ctrl_init(go);
270 	if (ret < 0)
271 		return ret;
272 
273 	if (!go->i2c_adapter_online &&
274 			go->board_info->flags & GO7007_BOARD_USE_ONBOARD_I2C) {
275 		ret = go7007_i2c_init(go);
276 		if (ret < 0)
277 			return ret;
278 		go->i2c_adapter_online = 1;
279 	}
280 	if (go->i2c_adapter_online) {
281 		if (go->board_id == GO7007_BOARDID_ADS_USBAV_709) {
282 			/* Reset the TW9906 */
283 			go7007_write_addr(go, 0x3c82, 0x0009);
284 			msleep(50);
285 			go7007_write_addr(go, 0x3c82, 0x000d);
286 		}
287 		for (i = 0; i < num_i2c_devs; ++i)
288 			init_i2c_module(&go->i2c_adapter, &go->board_info->i2c_devs[i]);
289 
290 		if (go->tuner_type >= 0) {
291 			struct tuner_setup setup = {
292 				.addr = ADDR_UNSET,
293 				.type = go->tuner_type,
294 				.mode_mask = T_ANALOG_TV,
295 			};
296 
297 			v4l2_device_call_all(&go->v4l2_dev, 0, tuner,
298 				s_type_addr, &setup);
299 		}
300 		if (go->board_id == GO7007_BOARDID_ADLINK_MPG24)
301 			v4l2_subdev_call(go->sd_video, video, s_routing,
302 					0, 0, go->channel_number + 1);
303 	}
304 
305 	ret = go7007_v4l2_init(go);
306 	if (ret < 0)
307 		return ret;
308 
309 	if (go->board_info->flags & GO7007_BOARD_HAS_AUDIO) {
310 		go->audio_enabled = 1;
311 		go7007_snd_init(go);
312 	}
313 	return 0;
314 }
315 EXPORT_SYMBOL(go7007_register_encoder);
316 
317 /*
318  * Send the encode firmware to the encoder, which will cause it
319  * to immediately start delivering the video and audio streams.
320  *
321  * Must be called with the hw_lock held.
322  */
323 int go7007_start_encoder(struct go7007 *go)
324 {
325 	u8 *fw;
326 	int fw_len, rv = 0, i, x, y;
327 	u16 intr_val, intr_data;
328 
329 	go->modet_enable = 0;
330 	for (i = 0; i < 4; i++)
331 		go->modet[i].enable = 0;
332 
333 	switch (v4l2_ctrl_g_ctrl(go->modet_mode)) {
334 	case V4L2_DETECT_MD_MODE_GLOBAL:
335 		memset(go->modet_map, 0, sizeof(go->modet_map));
336 		go->modet[0].enable = 1;
337 		go->modet_enable = 1;
338 		break;
339 	case V4L2_DETECT_MD_MODE_REGION_GRID:
340 		for (y = 0; y < go->height / 16; y++) {
341 			for (x = 0; x < go->width / 16; x++) {
342 				int idx = y * go->width / 16 + x;
343 
344 				go->modet[go->modet_map[idx]].enable = 1;
345 			}
346 		}
347 		go->modet_enable = 1;
348 		break;
349 	}
350 
351 	if (go->dvd_mode)
352 		go->modet_enable = 0;
353 
354 	if (go7007_construct_fw_image(go, &fw, &fw_len) < 0)
355 		return -1;
356 
357 	if (go7007_send_firmware(go, fw, fw_len) < 0 ||
358 			go7007_read_interrupt(go, &intr_val, &intr_data) < 0) {
359 		v4l2_err(&go->v4l2_dev, "error transferring firmware\n");
360 		rv = -1;
361 		goto start_error;
362 	}
363 
364 	go->state = STATE_DATA;
365 	go->parse_length = 0;
366 	go->seen_frame = 0;
367 	if (go7007_stream_start(go) < 0) {
368 		v4l2_err(&go->v4l2_dev, "error starting stream transfer\n");
369 		rv = -1;
370 		goto start_error;
371 	}
372 
373 start_error:
374 	kfree(fw);
375 	return rv;
376 }
377 
378 /*
379  * Store a byte in the current video buffer, if there is one.
380  */
381 static inline void store_byte(struct go7007_buffer *vb, u8 byte)
382 {
383 	if (vb && vb->vb.vb2_buf.planes[0].bytesused < GO7007_BUF_SIZE) {
384 		u8 *ptr = vb2_plane_vaddr(&vb->vb.vb2_buf, 0);
385 
386 		ptr[vb->vb.vb2_buf.planes[0].bytesused++] = byte;
387 	}
388 }
389 
390 static void go7007_set_motion_regions(struct go7007 *go, struct go7007_buffer *vb,
391 		u32 motion_regions)
392 {
393 	if (motion_regions != go->modet_event_status) {
394 		struct v4l2_event ev = {
395 			.type = V4L2_EVENT_MOTION_DET,
396 			.u.motion_det = {
397 				.flags = V4L2_EVENT_MD_FL_HAVE_FRAME_SEQ,
398 				.frame_sequence = vb->vb.sequence,
399 				.region_mask = motion_regions,
400 			},
401 		};
402 
403 		v4l2_event_queue(&go->vdev, &ev);
404 		go->modet_event_status = motion_regions;
405 	}
406 }
407 
408 /*
409  * Determine regions with motion and send a motion detection event
410  * in case of changes.
411  */
412 static void go7007_motion_regions(struct go7007 *go, struct go7007_buffer *vb)
413 {
414 	u32 *bytesused = &vb->vb.vb2_buf.planes[0].bytesused;
415 	unsigned motion[4] = { 0, 0, 0, 0 };
416 	u32 motion_regions = 0;
417 	unsigned stride = (go->width + 7) >> 3;
418 	unsigned x, y;
419 	int i;
420 
421 	for (i = 0; i < 216; ++i)
422 		store_byte(vb, go->active_map[i]);
423 	for (y = 0; y < go->height / 16; y++) {
424 		for (x = 0; x < go->width / 16; x++) {
425 			if (!(go->active_map[y * stride + (x >> 3)] & (1 << (x & 7))))
426 				continue;
427 			motion[go->modet_map[y * (go->width / 16) + x]]++;
428 		}
429 	}
430 	motion_regions = ((motion[0] > 0) << 0) |
431 			 ((motion[1] > 0) << 1) |
432 			 ((motion[2] > 0) << 2) |
433 			 ((motion[3] > 0) << 3);
434 	*bytesused -= 216;
435 	go7007_set_motion_regions(go, vb, motion_regions);
436 }
437 
438 /*
439  * Deliver the last video buffer and get a new one to start writing to.
440  */
441 static struct go7007_buffer *frame_boundary(struct go7007 *go, struct go7007_buffer *vb)
442 {
443 	u32 *bytesused;
444 	struct go7007_buffer *vb_tmp = NULL;
445 	unsigned long flags;
446 
447 	if (vb == NULL) {
448 		spin_lock_irqsave(&go->spinlock, flags);
449 		if (!list_empty(&go->vidq_active))
450 			vb = go->active_buf =
451 				list_first_entry(&go->vidq_active, struct go7007_buffer, list);
452 		spin_unlock_irqrestore(&go->spinlock, flags);
453 		go->next_seq++;
454 		return vb;
455 	}
456 	bytesused = &vb->vb.vb2_buf.planes[0].bytesused;
457 
458 	vb->vb.sequence = go->next_seq++;
459 	if (vb->modet_active && *bytesused + 216 < GO7007_BUF_SIZE)
460 		go7007_motion_regions(go, vb);
461 	else
462 		go7007_set_motion_regions(go, vb, 0);
463 
464 	vb->vb.vb2_buf.timestamp = ktime_get_ns();
465 	vb_tmp = vb;
466 	spin_lock_irqsave(&go->spinlock, flags);
467 	list_del(&vb->list);
468 	if (list_empty(&go->vidq_active))
469 		vb = NULL;
470 	else
471 		vb = list_first_entry(&go->vidq_active,
472 				struct go7007_buffer, list);
473 	go->active_buf = vb;
474 	spin_unlock_irqrestore(&go->spinlock, flags);
475 	vb2_buffer_done(&vb_tmp->vb.vb2_buf, VB2_BUF_STATE_DONE);
476 	return vb;
477 }
478 
479 static void write_bitmap_word(struct go7007 *go)
480 {
481 	int x, y, i, stride = ((go->width >> 4) + 7) >> 3;
482 
483 	for (i = 0; i < 16; ++i) {
484 		y = (((go->parse_length - 1) << 3) + i) / (go->width >> 4);
485 		x = (((go->parse_length - 1) << 3) + i) % (go->width >> 4);
486 		if (stride * y + (x >> 3) < sizeof(go->active_map))
487 			go->active_map[stride * y + (x >> 3)] |=
488 					(go->modet_word & 1) << (x & 0x7);
489 		go->modet_word >>= 1;
490 	}
491 }
492 
493 /*
494  * Parse a chunk of the video stream into frames.  The frames are not
495  * delimited by the hardware, so we have to parse the frame boundaries
496  * based on the type of video stream we're receiving.
497  */
498 void go7007_parse_video_stream(struct go7007 *go, u8 *buf, int length)
499 {
500 	struct go7007_buffer *vb = go->active_buf;
501 	int i, seq_start_code = -1, gop_start_code = -1, frame_start_code = -1;
502 
503 	switch (go->format) {
504 	case V4L2_PIX_FMT_MPEG4:
505 		seq_start_code = 0xB0;
506 		gop_start_code = 0xB3;
507 		frame_start_code = 0xB6;
508 		break;
509 	case V4L2_PIX_FMT_MPEG1:
510 	case V4L2_PIX_FMT_MPEG2:
511 		seq_start_code = 0xB3;
512 		gop_start_code = 0xB8;
513 		frame_start_code = 0x00;
514 		break;
515 	}
516 
517 	for (i = 0; i < length; ++i) {
518 		if (vb && vb->vb.vb2_buf.planes[0].bytesused >=
519 				GO7007_BUF_SIZE - 3) {
520 			v4l2_info(&go->v4l2_dev, "dropping oversized frame\n");
521 			vb2_set_plane_payload(&vb->vb.vb2_buf, 0, 0);
522 			vb->frame_offset = 0;
523 			vb->modet_active = 0;
524 			vb = go->active_buf = NULL;
525 		}
526 
527 		switch (go->state) {
528 		case STATE_DATA:
529 			switch (buf[i]) {
530 			case 0x00:
531 				go->state = STATE_00;
532 				break;
533 			case 0xFF:
534 				go->state = STATE_FF;
535 				break;
536 			default:
537 				store_byte(vb, buf[i]);
538 				break;
539 			}
540 			break;
541 		case STATE_00:
542 			switch (buf[i]) {
543 			case 0x00:
544 				go->state = STATE_00_00;
545 				break;
546 			case 0xFF:
547 				store_byte(vb, 0x00);
548 				go->state = STATE_FF;
549 				break;
550 			default:
551 				store_byte(vb, 0x00);
552 				store_byte(vb, buf[i]);
553 				go->state = STATE_DATA;
554 				break;
555 			}
556 			break;
557 		case STATE_00_00:
558 			switch (buf[i]) {
559 			case 0x00:
560 				store_byte(vb, 0x00);
561 				/* go->state remains STATE_00_00 */
562 				break;
563 			case 0x01:
564 				go->state = STATE_00_00_01;
565 				break;
566 			case 0xFF:
567 				store_byte(vb, 0x00);
568 				store_byte(vb, 0x00);
569 				go->state = STATE_FF;
570 				break;
571 			default:
572 				store_byte(vb, 0x00);
573 				store_byte(vb, 0x00);
574 				store_byte(vb, buf[i]);
575 				go->state = STATE_DATA;
576 				break;
577 			}
578 			break;
579 		case STATE_00_00_01:
580 			if (buf[i] == 0xF8 && go->modet_enable == 0) {
581 				/* MODET start code, but MODET not enabled */
582 				store_byte(vb, 0x00);
583 				store_byte(vb, 0x00);
584 				store_byte(vb, 0x01);
585 				store_byte(vb, 0xF8);
586 				go->state = STATE_DATA;
587 				break;
588 			}
589 			/* If this is the start of a new MPEG frame,
590 			 * get a new buffer */
591 			if ((go->format == V4L2_PIX_FMT_MPEG1 ||
592 			     go->format == V4L2_PIX_FMT_MPEG2 ||
593 			     go->format == V4L2_PIX_FMT_MPEG4) &&
594 			    (buf[i] == seq_start_code ||
595 			     buf[i] == gop_start_code ||
596 			     buf[i] == frame_start_code)) {
597 				if (vb == NULL || go->seen_frame)
598 					vb = frame_boundary(go, vb);
599 				go->seen_frame = buf[i] == frame_start_code;
600 				if (vb && go->seen_frame)
601 					vb->frame_offset =
602 					vb->vb.vb2_buf.planes[0].bytesused;
603 			}
604 			/* Handle any special chunk types, or just write the
605 			 * start code to the (potentially new) buffer */
606 			switch (buf[i]) {
607 			case 0xF5: /* timestamp */
608 				go->parse_length = 12;
609 				go->state = STATE_UNPARSED;
610 				break;
611 			case 0xF6: /* vbi */
612 				go->state = STATE_VBI_LEN_A;
613 				break;
614 			case 0xF8: /* MD map */
615 				go->parse_length = 0;
616 				memset(go->active_map, 0,
617 						sizeof(go->active_map));
618 				go->state = STATE_MODET_MAP;
619 				break;
620 			case 0xFF: /* Potential JPEG start code */
621 				store_byte(vb, 0x00);
622 				store_byte(vb, 0x00);
623 				store_byte(vb, 0x01);
624 				go->state = STATE_FF;
625 				break;
626 			default:
627 				store_byte(vb, 0x00);
628 				store_byte(vb, 0x00);
629 				store_byte(vb, 0x01);
630 				store_byte(vb, buf[i]);
631 				go->state = STATE_DATA;
632 				break;
633 			}
634 			break;
635 		case STATE_FF:
636 			switch (buf[i]) {
637 			case 0x00:
638 				store_byte(vb, 0xFF);
639 				go->state = STATE_00;
640 				break;
641 			case 0xFF:
642 				store_byte(vb, 0xFF);
643 				/* go->state remains STATE_FF */
644 				break;
645 			case 0xD8:
646 				if (go->format == V4L2_PIX_FMT_MJPEG)
647 					vb = frame_boundary(go, vb);
648 				fallthrough;
649 			default:
650 				store_byte(vb, 0xFF);
651 				store_byte(vb, buf[i]);
652 				go->state = STATE_DATA;
653 				break;
654 			}
655 			break;
656 		case STATE_VBI_LEN_A:
657 			go->parse_length = buf[i] << 8;
658 			go->state = STATE_VBI_LEN_B;
659 			break;
660 		case STATE_VBI_LEN_B:
661 			go->parse_length |= buf[i];
662 			if (go->parse_length > 0)
663 				go->state = STATE_UNPARSED;
664 			else
665 				go->state = STATE_DATA;
666 			break;
667 		case STATE_MODET_MAP:
668 			if (go->parse_length < 204) {
669 				if (go->parse_length & 1) {
670 					go->modet_word |= buf[i];
671 					write_bitmap_word(go);
672 				} else
673 					go->modet_word = buf[i] << 8;
674 			} else if (go->parse_length == 207 && vb) {
675 				vb->modet_active = buf[i];
676 			}
677 			if (++go->parse_length == 208)
678 				go->state = STATE_DATA;
679 			break;
680 		case STATE_UNPARSED:
681 			if (--go->parse_length == 0)
682 				go->state = STATE_DATA;
683 			break;
684 		}
685 	}
686 }
687 EXPORT_SYMBOL(go7007_parse_video_stream);
688 
689 /*
690  * Allocate a new go7007 struct.  Used by the hardware-specific probe.
691  */
692 struct go7007 *go7007_alloc(const struct go7007_board_info *board,
693 						struct device *dev)
694 {
695 	struct go7007 *go;
696 
697 	go = kzalloc(sizeof(struct go7007), GFP_KERNEL);
698 	if (go == NULL)
699 		return NULL;
700 	go->dev = dev;
701 	go->board_info = board;
702 	go->tuner_type = -1;
703 	mutex_init(&go->hw_lock);
704 	init_waitqueue_head(&go->frame_waitq);
705 	spin_lock_init(&go->spinlock);
706 	go->status = STATUS_INIT;
707 	init_waitqueue_head(&go->interrupt_waitq);
708 	go7007_update_board(go);
709 	go->format = V4L2_PIX_FMT_MJPEG;
710 	go->bitrate = 1500000;
711 	go->fps_scale = 1;
712 	go->aspect_ratio = GO7007_RATIO_1_1;
713 
714 	return go;
715 }
716 EXPORT_SYMBOL(go7007_alloc);
717 
718 void go7007_update_board(struct go7007 *go)
719 {
720 	const struct go7007_board_info *board = go->board_info;
721 
722 	if (board->sensor_flags & GO7007_SENSOR_TV) {
723 		go->standard = GO7007_STD_NTSC;
724 		go->std = V4L2_STD_NTSC_M;
725 		go->width = 720;
726 		go->height = 480;
727 		go->sensor_framerate = 30000;
728 	} else {
729 		go->standard = GO7007_STD_OTHER;
730 		go->width = board->sensor_width;
731 		go->height = board->sensor_height;
732 		go->sensor_framerate = board->sensor_framerate;
733 	}
734 	go->encoder_v_offset = board->sensor_v_offset;
735 	go->encoder_h_offset = board->sensor_h_offset;
736 }
737 EXPORT_SYMBOL(go7007_update_board);
738 
739 MODULE_LICENSE("GPL v2");
740