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 */
33int 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}
49EXPORT_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 */
56int 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}
70EXPORT_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 */
78static 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: &fw_entry, name: fw_name, device: 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(p: fw_entry->data, q: "WISGO7007FW", size: 11)) {
92 v4l2_err(go, "file \"%s\" does not appear to be go7007 firmware\n", fw_name);
93 release_firmware(fw: fw_entry);
94 return -1;
95 }
96 fw_len = fw_entry->size - 16;
97 bounce = kmemdup(p: fw_entry->data + 16, size: 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: fw_entry);
101 return -1;
102 }
103 release_firmware(fw: 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(objp: go->boot_fw);
113 go->boot_fw = NULL;
114 return -1;
115 }
116 return 0;
117}
118
119MODULE_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 */
128int 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(lock: &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}
144EXPORT_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 */
153static 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 */
187int 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 */
197static int init_i2c_module(struct i2c_adapter *adapter, const struct go_i2c *const i2c)
198{
199 struct go7007 *go = i2c_get_adapdata(adap: 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: &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 */
227static 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(adap: &go->i2c_adapter);
236 go->i2c_adapter_online = 0;
237 }
238
239 kfree(objp: go->boot_fw);
240 go7007_v4l2_remove(go);
241 kfree(objp: 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 */
252int 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(dev: go->dev, v4l2_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(lock: &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(msecs: 50);
285 go7007_write_addr(go, 0x3c82, 0x000d);
286 }
287 for (i = 0; i < num_i2c_devs; ++i)
288 init_i2c_module(adapter: &go->i2c_adapter, i2c: &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}
315EXPORT_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 */
323int 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(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, fwlen: &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
373start_error:
374 kfree(objp: fw);
375 return rv;
376}
377
378/*
379 * Store a byte in the current video buffer, if there is one.
380 */
381static 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->vb.vb2_buf, plane_no: 0);
385
386 ptr[vb->vb.vb2_buf.planes[0].bytesused++] = byte;
387 }
388}
389
390static 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(vdev: &go->vdev, ev: &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 */
412static 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, byte: 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 */
441static 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(head: &go->vidq_active))
450 vb = go->active_buf =
451 list_first_entry(&go->vidq_active, struct go7007_buffer, list);
452 spin_unlock_irqrestore(lock: &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, motion_regions: 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(entry: &vb->list);
468 if (list_empty(head: &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(lock: &go->spinlock, flags);
475 vb2_buffer_done(vb: &vb_tmp->vb.vb2_buf, state: VB2_BUF_STATE_DONE);
476 return vb;
477}
478
479static 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 */
498void 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->vb.vb2_buf, plane_no: 0, size: 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, byte: 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, byte: 0x00);
548 go->state = STATE_FF;
549 break;
550 default:
551 store_byte(vb, byte: 0x00);
552 store_byte(vb, byte: 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, byte: 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, byte: 0x00);
568 store_byte(vb, byte: 0x00);
569 go->state = STATE_FF;
570 break;
571 default:
572 store_byte(vb, byte: 0x00);
573 store_byte(vb, byte: 0x00);
574 store_byte(vb, byte: 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, byte: 0x00);
583 store_byte(vb, byte: 0x00);
584 store_byte(vb, byte: 0x01);
585 store_byte(vb, byte: 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, byte: 0x00);
622 store_byte(vb, byte: 0x00);
623 store_byte(vb, byte: 0x01);
624 go->state = STATE_FF;
625 break;
626 default:
627 store_byte(vb, byte: 0x00);
628 store_byte(vb, byte: 0x00);
629 store_byte(vb, byte: 0x01);
630 store_byte(vb, byte: 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, byte: 0xFF);
639 go->state = STATE_00;
640 break;
641 case 0xFF:
642 store_byte(vb, byte: 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, byte: 0xFF);
651 store_byte(vb, byte: 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}
687EXPORT_SYMBOL(go7007_parse_video_stream);
688
689/*
690 * Allocate a new go7007 struct. Used by the hardware-specific probe.
691 */
692struct go7007 *go7007_alloc(const struct go7007_board_info *board,
693 struct device *dev)
694{
695 struct go7007 *go;
696
697 go = kzalloc(size: 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}
716EXPORT_SYMBOL(go7007_alloc);
717
718void 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}
737EXPORT_SYMBOL(go7007_update_board);
738
739MODULE_LICENSE("GPL v2");
740

source code of linux/drivers/media/usb/go7007/go7007-driver.c