drivers/media/usb/go7007/go7007-driver.c - LeafOS-Devices/android_kernel_realme_mt6785 - Gitiles

 /*
  * Copyright (C) 2005-2006 Micronas USA Inc.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License (Version 2) as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/module.h>
 #include <linux/delay.h>
 #include <linux/sched.h>
 #include <linux/spinlock.h>
 #include <linux/unistd.h>
 #include <linux/time.h>
 #include <linux/mm.h>
 #include <linux/vmalloc.h>
 #include <linux/device.h>
 #include <linux/i2c.h>
 #include <linux/firmware.h>
 #include <linux/mutex.h>
 #include <linux/uaccess.h>
 #include <linux/slab.h>
 #include <linux/videodev2.h>
 #include <media/tuner.h>
 #include <media/v4l2-common.h>
 #include <media/v4l2-event.h>

 #include "go7007-priv.h"

 /*
  * Wait for an interrupt to be delivered from the GO7007SB and return
  * the associated value and data.
  *
  * Must be called with the hw_lock held.
  */
 int go7007_read_interrupt(struct go7007 *go, u16 *value, u16 *data)
 {
 	go->interrupt_available = 0;
 	go->hpi_ops->read_interrupt(go);
 	if (wait_event_timeout(go->interrupt_waitq,
 				go->interrupt_available, 5*HZ) < 0) {
 		v4l2_err(&go->v4l2_dev, "timeout waiting for read interrupt\n");
 		return -1;
 	}
 	if (!go->interrupt_available)
 		return -1;
 	go->interrupt_available = 0;
 	*value = go->interrupt_value & 0xfffe;
 	*data = go->interrupt_data;
 	return 0;
 }
 EXPORT_SYMBOL(go7007_read_interrupt);

 /*
  * Read a register/address on the GO7007SB.
  *
  * Must be called with the hw_lock held.
  */
 int go7007_read_addr(struct go7007 *go, u16 addr, u16 *data)
 {
 	int count = 100;
 	u16 value;

 	if (go7007_write_interrupt(go, 0x0010, addr) < 0)
 		return -EIO;
 	while (count-- > 0) {
 		if (go7007_read_interrupt(go, &value, data) == 0 &&
 				value == 0xa000)
 			return 0;
 	}
 	return -EIO;
 }
 EXPORT_SYMBOL(go7007_read_addr);

 /*
  * Send the boot firmware to the encoder, which just wakes it up and lets
  * us talk to the GPIO pins and on-board I2C adapter.
  *
  * Must be called with the hw_lock held.
  */
 static int go7007_load_encoder(struct go7007 *go)
 {
 	const struct firmware *fw_entry;
 	char fw_name[] = "go7007/go7007fw.bin";
 	void *bounce;
 	int fw_len, rv = 0;
 	u16 intr_val, intr_data;

 	if (go->boot_fw == NULL) {
 		if (request_firmware(&fw_entry, fw_name, go->dev)) {
 			v4l2_err(go, "unable to load firmware from file \"%s\"\n", fw_name);
 			return -1;
 		}
 		if (fw_entry->size < 16 || memcmp(fw_entry->data, "WISGO7007FW", 11)) {
 			v4l2_err(go, "file \"%s\" does not appear to be go7007 firmware\n", fw_name);
 			release_firmware(fw_entry);
 			return -1;
 		}
 		fw_len = fw_entry->size - 16;
 		bounce = kmemdup(fw_entry->data + 16, fw_len, GFP_KERNEL);
 		if (bounce == NULL) {
 			v4l2_err(go, "unable to allocate %d bytes for firmware transfer\n", fw_len);
 			release_firmware(fw_entry);
 			return -1;
 		}
 		release_firmware(fw_entry);
 		go->boot_fw_len = fw_len;
 		go->boot_fw = bounce;
 	}
 	if (go7007_interface_reset(go) < 0 ||
 	    go7007_send_firmware(go, go->boot_fw, go->boot_fw_len) < 0 ||
 	    go7007_read_interrupt(go, &intr_val, &intr_data) < 0 ||
 			(intr_val & ~0x1) != 0x5a5a) {
 		v4l2_err(go, "error transferring firmware\n");
 		rv = -1;
 	}
 	return rv;
 }

 MODULE_FIRMWARE("go7007/go7007fw.bin");

 /*
  * Boot the encoder and register the I2C adapter if requested.  Do the
  * minimum initialization necessary, since the board-specific code may
  * still need to probe the board ID.
  *
  * Must NOT be called with the hw_lock held.
  */
 int go7007_boot_encoder(struct go7007 *go, int init_i2c)
 {
 	int ret;

 	mutex_lock(&go->hw_lock);
 	ret = go7007_load_encoder(go);
 	mutex_unlock(&go->hw_lock);
 	if (ret < 0)
 		return -1;
 	if (!init_i2c)
 		return 0;
 	if (go7007_i2c_init(go) < 0)
 		return -1;
 	go->i2c_adapter_online = 1;
 	return 0;
 }
 EXPORT_SYMBOL(go7007_boot_encoder);

 /*
  * Configure any hardware-related registers in the GO7007, such as GPIO
  * pins and bus parameters, which are board-specific.  This assumes
  * the boot firmware has already been downloaded.
  *
  * Must be called with the hw_lock held.
  */
 static int go7007_init_encoder(struct go7007 *go)
 {
 	if (go->board_info->audio_flags & GO7007_AUDIO_I2S_MASTER) {
 		go7007_write_addr(go, 0x1000, 0x0811);
 		go7007_write_addr(go, 0x1000, 0x0c11);
 	}
 	switch (go->board_id) {
 	case GO7007_BOARDID_MATRIX_REV:
 		/* Set GPIO pin 0 to be an output (audio clock control) */
 		go7007_write_addr(go, 0x3c82, 0x0001);
 		go7007_write_addr(go, 0x3c80, 0x00fe);
 		break;
 	case GO7007_BOARDID_ADLINK_MPG24:
 		/* set GPIO5 to be an output, currently low */
 		go7007_write_addr(go, 0x3c82, 0x0000);
 		go7007_write_addr(go, 0x3c80, 0x00df);
 		break;
 	case GO7007_BOARDID_ADS_USBAV_709:
 		/* GPIO pin 0: audio clock control */
 		/*      pin 2: TW9906 reset */
 		/*      pin 3: capture LED */
 		go7007_write_addr(go, 0x3c82, 0x000d);
 		go7007_write_addr(go, 0x3c80, 0x00f2);
 		break;
 	}
 	return 0;
 }

 /*
  * Send the boot firmware to the GO7007 and configure the registers.  This
  * is the only way to stop the encoder once it has started streaming video.
  *
  * Must be called with the hw_lock held.
  */
 int go7007_reset_encoder(struct go7007 *go)
 {
 	if (go7007_load_encoder(go) < 0)
 		return -1;
 	return go7007_init_encoder(go);
 }

 /*
  * Attempt to instantiate an I2C client by ID, probably loading a module.
  */
 static int init_i2c_module(struct i2c_adapter *adapter, const struct go_i2c *const i2c)
 {
 	struct go7007 *go = i2c_get_adapdata(adapter);
 	struct v4l2_device *v4l2_dev = &go->v4l2_dev;
 	struct v4l2_subdev *sd;
 	struct i2c_board_info info;

 	memset(&info, 0, sizeof(info));
 	strlcpy(info.type, i2c->type, sizeof(info.type));
 	info.addr = i2c->addr;
 	info.flags = i2c->flags;

 	sd = v4l2_i2c_new_subdev_board(v4l2_dev, adapter, &info, NULL);
 	if (sd) {
 		if (i2c->is_video)
 			go->sd_video = sd;
 		if (i2c->is_audio)
 			go->sd_audio = sd;
 		return 0;
 	}

 	pr_info("go7007: probing for module i2c:%s failed\n", i2c->type);
 	return -EINVAL;
 }

 /*
  * Detach and unregister the encoder.  The go7007 struct won't be freed
  * until v4l2 finishes releasing its resources and all associated fds are
  * closed by applications.
  */
 static void go7007_remove(struct v4l2_device *v4l2_dev)
 {
 	struct go7007 *go = container_of(v4l2_dev, struct go7007, v4l2_dev);

 	v4l2_device_unregister(v4l2_dev);
 	if (go->hpi_ops->release)
 		go->hpi_ops->release(go);
 	if (go->i2c_adapter_online) {
 		i2c_del_adapter(&go->i2c_adapter);
 		go->i2c_adapter_online = 0;
 	}

 	kfree(go->boot_fw);
 	go7007_v4l2_remove(go);
 	kfree(go);
 }

 /*
  * Finalize the GO7007 hardware setup, register the on-board I2C adapter
  * (if used on this board), load the I2C client driver for the sensor
  * (SAA7115 or whatever) and other devices, and register the ALSA and V4L2
  * interfaces.
  *
  * Must NOT be called with the hw_lock held.
  */
 int go7007_register_encoder(struct go7007 *go, unsigned num_i2c_devs)
 {
 	int i, ret;

 	dev_info(go->dev, "go7007: registering new %s\n", go->name);

 	go->v4l2_dev.release = go7007_remove;
 	ret = v4l2_device_register(go->dev, &go->v4l2_dev);
 	if (ret < 0)
 		return ret;

 	mutex_lock(&go->hw_lock);
 	ret = go7007_init_encoder(go);
 	mutex_unlock(&go->hw_lock);
 	if (ret < 0)
 		return ret;

 	ret = go7007_v4l2_ctrl_init(go);
 	if (ret < 0)
 		return ret;

 	if (!go->i2c_adapter_online &&
 			go->board_info->flags & GO7007_BOARD_USE_ONBOARD_I2C) {
 		ret = go7007_i2c_init(go);
 		if (ret < 0)
 			return ret;
 		go->i2c_adapter_online = 1;
 	}
 	if (go->i2c_adapter_online) {
 		if (go->board_id == GO7007_BOARDID_ADS_USBAV_709) {
 			/* Reset the TW9906 */
 			go7007_write_addr(go, 0x3c82, 0x0009);
 			msleep(50);
 			go7007_write_addr(go, 0x3c82, 0x000d);
 		}
 		for (i = 0; i < num_i2c_devs; ++i)
 			init_i2c_module(&go->i2c_adapter, &go->board_info->i2c_devs[i]);

 		if (go->tuner_type >= 0) {
 			struct tuner_setup setup = {
 				.addr = ADDR_UNSET,
 				.type = go->tuner_type,
 				.mode_mask = T_ANALOG_TV,
 			};

 			v4l2_device_call_all(&go->v4l2_dev, 0, tuner,
 				s_type_addr, &setup);
 		}
 		if (go->board_id == GO7007_BOARDID_ADLINK_MPG24)
 			v4l2_subdev_call(go->sd_video, video, s_routing,
 					0, 0, go->channel_number + 1);
 	}

 	ret = go7007_v4l2_init(go);
 	if (ret < 0)
 		return ret;

 	if (go->board_info->flags & GO7007_BOARD_HAS_AUDIO) {
 		go->audio_enabled = 1;
 		go7007_snd_init(go);
 	}
 	return 0;
 }
 EXPORT_SYMBOL(go7007_register_encoder);

 /*
  * Send the encode firmware to the encoder, which will cause it
  * to immediately start delivering the video and audio streams.
  *
  * Must be called with the hw_lock held.
  */
 int go7007_start_encoder(struct go7007 *go)
 {
 	u8 *fw;
 	int fw_len, rv = 0, i, x, y;
 	u16 intr_val, intr_data;

 	go->modet_enable = 0;
 	for (i = 0; i < 4; i++)
 		go->modet[i].enable = 0;

 	switch (v4l2_ctrl_g_ctrl(go->modet_mode)) {
 	case V4L2_DETECT_MD_MODE_GLOBAL:
 		memset(go->modet_map, 0, sizeof(go->modet_map));
 		go->modet[0].enable = 1;
 		go->modet_enable = 1;
 		break;
 	case V4L2_DETECT_MD_MODE_REGION_GRID:
 		for (y = 0; y < go->height / 16; y++) {
 			for (x = 0; x < go->width / 16; x++) {
 				int idx = y * go->width / 16 + x;

 				go->modet[go->modet_map[idx]].enable = 1;
 			}
 		}
 		go->modet_enable = 1;
 		break;
 	}

 	if (go->dvd_mode)
 		go->modet_enable = 0;

 	if (go7007_construct_fw_image(go, &fw, &fw_len) < 0)
 		return -1;

 	if (go7007_send_firmware(go, fw, fw_len) < 0 ||
 			go7007_read_interrupt(go, &intr_val, &intr_data) < 0) {
 		v4l2_err(&go->v4l2_dev, "error transferring firmware\n");
 		rv = -1;
 		goto start_error;
 	}

 	go->state = STATE_DATA;
 	go->parse_length = 0;
 	go->seen_frame = 0;
 	if (go7007_stream_start(go) < 0) {
 		v4l2_err(&go->v4l2_dev, "error starting stream transfer\n");
 		rv = -1;
 		goto start_error;
 	}

 start_error:
 	kfree(fw);
 	return rv;
 }

 /*
  * Store a byte in the current video buffer, if there is one.
  */
 static inline void store_byte(struct go7007_buffer *vb, u8 byte)
 {
 	if (vb && vb->vb.v4l2_planes[0].bytesused < GO7007_BUF_SIZE) {
 		u8 *ptr = vb2_plane_vaddr(&vb->vb, 0);

 		ptr[vb->vb.v4l2_planes[0].bytesused++] = byte;
 	}
 }

 static void go7007_set_motion_regions(struct go7007 *go, struct go7007_buffer *vb,
 		u32 motion_regions)
 {
 	if (motion_regions != go->modet_event_status) {
 		struct v4l2_event ev = {
 			.type = V4L2_EVENT_MOTION_DET,
 			.u.motion_det = {
 				.flags = V4L2_EVENT_MD_FL_HAVE_FRAME_SEQ,
 				.frame_sequence = vb->vb.v4l2_buf.sequence,
 				.region_mask = motion_regions,
 			},
 		};

 		v4l2_event_queue(&go->vdev, &ev);
 		go->modet_event_status = motion_regions;
 	}
 }

 /*
  * Determine regions with motion and send a motion detection event
  * in case of changes.
  */
 static void go7007_motion_regions(struct go7007 *go, struct go7007_buffer *vb)
 {
 	u32 *bytesused = &vb->vb.v4l2_planes[0].bytesused;
 	unsigned motion[4] = { 0, 0, 0, 0 };
 	u32 motion_regions = 0;
 	unsigned stride = (go->width + 7) >> 3;
 	unsigned x, y;
 	int i;

 	for (i = 0; i < 216; ++i)
 		store_byte(vb, go->active_map[i]);
 	for (y = 0; y < go->height / 16; y++) {
 		for (x = 0; x < go->width / 16; x++) {
 			if (!(go->active_map[y * stride + (x >> 3)] & (1 << (x & 7))))
 				continue;
 			motion[go->modet_map[y * (go->width / 16) + x]]++;
 		}
 	}
 	motion_regions = ((motion[0] > 0) << 0) |
 			 ((motion[1] > 0) << 1) |
 			 ((motion[2] > 0) << 2) |
 			 ((motion[3] > 0) << 3);
 	*bytesused -= 216;
 	go7007_set_motion_regions(go, vb, motion_regions);
 }

 /*
  * Deliver the last video buffer and get a new one to start writing to.
  */
 static struct go7007_buffer *frame_boundary(struct go7007 *go, struct go7007_buffer *vb)
 {
 	u32 *bytesused = &vb->vb.v4l2_planes[0].bytesused;
 	struct go7007_buffer *vb_tmp = NULL;

 	if (vb == NULL) {
 		spin_lock(&go->spinlock);
 		if (!list_empty(&go->vidq_active))
 			vb = go->active_buf =
 				list_first_entry(&go->vidq_active, struct go7007_buffer, list);
 		spin_unlock(&go->spinlock);
 		go->next_seq++;
 		return vb;
 	}

 	vb->vb.v4l2_buf.sequence = go->next_seq++;
 	if (vb->modet_active && *bytesused + 216 < GO7007_BUF_SIZE)
 		go7007_motion_regions(go, vb);
 	else
 		go7007_set_motion_regions(go, vb, 0);

 	v4l2_get_timestamp(&vb->vb.v4l2_buf.timestamp);
 	vb_tmp = vb;
 	spin_lock(&go->spinlock);
 	list_del(&vb->list);
 	if (list_empty(&go->vidq_active))
 		vb = NULL;
 	else
 		vb = list_first_entry(&go->vidq_active, struct go7007_buffer, list);
 	go->active_buf = vb;
 	spin_unlock(&go->spinlock);
 	vb2_buffer_done(&vb_tmp->vb, VB2_BUF_STATE_DONE);
 	return vb;
 }

 static void write_bitmap_word(struct go7007 *go)
 {
 	int x, y, i, stride = ((go->width >> 4) + 7) >> 3;

 	for (i = 0; i < 16; ++i) {
 		y = (((go->parse_length - 1) << 3) + i) / (go->width >> 4);
 		x = (((go->parse_length - 1) << 3) + i) % (go->width >> 4);
 		if (stride * y + (x >> 3) < sizeof(go->active_map))
 			go->active_map[stride * y + (x >> 3)] |=
 					(go->modet_word & 1) << (x & 0x7);
 		go->modet_word >>= 1;
 	}
 }

 /*
  * Parse a chunk of the video stream into frames.  The frames are not
  * delimited by the hardware, so we have to parse the frame boundaries
  * based on the type of video stream we're receiving.
  */
 void go7007_parse_video_stream(struct go7007 *go, u8 *buf, int length)
 {
 	struct go7007_buffer *vb = go->active_buf;
 	int i, seq_start_code = -1, gop_start_code = -1, frame_start_code = -1;

 	switch (go->format) {
 	case V4L2_PIX_FMT_MPEG4:
 		seq_start_code = 0xB0;
 		gop_start_code = 0xB3;
 		frame_start_code = 0xB6;
 		break;
 	case V4L2_PIX_FMT_MPEG1:
 	case V4L2_PIX_FMT_MPEG2:
 		seq_start_code = 0xB3;
 		gop_start_code = 0xB8;
 		frame_start_code = 0x00;
 		break;
 	}

 	for (i = 0; i < length; ++i) {
 		if (vb && vb->vb.v4l2_planes[0].bytesused >= GO7007_BUF_SIZE - 3) {
 			v4l2_info(&go->v4l2_dev, "dropping oversized frame\n");
 			vb->vb.v4l2_planes[0].bytesused = 0;
 			vb->frame_offset = 0;
 			vb->modet_active = 0;
 			vb = go->active_buf = NULL;
 		}

 		switch (go->state) {
 		case STATE_DATA:
 			switch (buf[i]) {
 			case 0x00:
 				go->state = STATE_00;
 				break;
 			case 0xFF:
 				go->state = STATE_FF;
 				break;
 			default:
 				store_byte(vb, buf[i]);
 				break;
 			}
 			break;
 		case STATE_00:
 			switch (buf[i]) {
 			case 0x00:
 				go->state = STATE_00_00;
 				break;
 			case 0xFF:
 				store_byte(vb, 0x00);
 				go->state = STATE_FF;
 				break;
 			default:
 				store_byte(vb, 0x00);
 				store_byte(vb, buf[i]);
 				go->state = STATE_DATA;
 				break;
 			}
 			break;
 		case STATE_00_00:
 			switch (buf[i]) {
 			case 0x00:
 				store_byte(vb, 0x00);
 				/* go->state remains STATE_00_00 */
 				break;
 			case 0x01:
 				go->state = STATE_00_00_01;
 				break;
 			case 0xFF:
 				store_byte(vb, 0x00);
 				store_byte(vb, 0x00);
 				go->state = STATE_FF;
 				break;
 			default:
 				store_byte(vb, 0x00);
 				store_byte(vb, 0x00);
 				store_byte(vb, buf[i]);
 				go->state = STATE_DATA;
 				break;
 			}
 			break;
 		case STATE_00_00_01:
 			if (buf[i] == 0xF8 && go->modet_enable == 0) {
 				/* MODET start code, but MODET not enabled */
 				store_byte(vb, 0x00);
 				store_byte(vb, 0x00);
 				store_byte(vb, 0x01);
 				store_byte(vb, 0xF8);
 				go->state = STATE_DATA;
 				break;
 			}
 			/* If this is the start of a new MPEG frame,
 			 * get a new buffer */
 			if ((go->format == V4L2_PIX_FMT_MPEG1 ||
 			     go->format == V4L2_PIX_FMT_MPEG2 ||
 			     go->format == V4L2_PIX_FMT_MPEG4) &&
 			    (buf[i] == seq_start_code ||
 			     buf[i] == gop_start_code ||
 			     buf[i] == frame_start_code)) {
 				if (vb == NULL || go->seen_frame)
 					vb = frame_boundary(go, vb);
 				go->seen_frame = buf[i] == frame_start_code;
 				if (vb && go->seen_frame)
 					vb->frame_offset = vb->vb.v4l2_planes[0].bytesused;
 			}
 			/* Handle any special chunk types, or just write the
 			 * start code to the (potentially new) buffer */
 			switch (buf[i]) {
 			case 0xF5: /* timestamp */
 				go->parse_length = 12;
 				go->state = STATE_UNPARSED;
 				break;
 			case 0xF6: /* vbi */
 				go->state = STATE_VBI_LEN_A;
 				break;
 			case 0xF8: /* MD map */
 				go->parse_length = 0;
 				memset(go->active_map, 0,
 						sizeof(go->active_map));
 				go->state = STATE_MODET_MAP;
 				break;
 			case 0xFF: /* Potential JPEG start code */
 				store_byte(vb, 0x00);
 				store_byte(vb, 0x00);
 				store_byte(vb, 0x01);
 				go->state = STATE_FF;
 				break;
 			default:
 				store_byte(vb, 0x00);
 				store_byte(vb, 0x00);
 				store_byte(vb, 0x01);
 				store_byte(vb, buf[i]);
 				go->state = STATE_DATA;
 				break;
 			}
 			break;
 		case STATE_FF:
 			switch (buf[i]) {
 			case 0x00:
 				store_byte(vb, 0xFF);
 				go->state = STATE_00;
 				break;
 			case 0xFF:
 				store_byte(vb, 0xFF);
 				/* go->state remains STATE_FF */
 				break;
 			case 0xD8:
 				if (go->format == V4L2_PIX_FMT_MJPEG)
 					vb = frame_boundary(go, vb);
 				/* fall through */
 			default:
 				store_byte(vb, 0xFF);
 				store_byte(vb, buf[i]);
 				go->state = STATE_DATA;
 				break;
 			}
 			break;
 		case STATE_VBI_LEN_A:
 			go->parse_length = buf[i] << 8;
 			go->state = STATE_VBI_LEN_B;
 			break;
 		case STATE_VBI_LEN_B:
 			go->parse_length |= buf[i];
 			if (go->parse_length > 0)
 				go->state = STATE_UNPARSED;
 			else
 				go->state = STATE_DATA;
 			break;
 		case STATE_MODET_MAP:
 			if (go->parse_length < 204) {
 				if (go->parse_length & 1) {
 					go->modet_word |= buf[i];
 					write_bitmap_word(go);
 				} else
 					go->modet_word = buf[i] << 8;
 			} else if (go->parse_length == 207 && vb) {
 				vb->modet_active = buf[i];
 			}
 			if (++go->parse_length == 208)
 				go->state = STATE_DATA;
 			break;
 		case STATE_UNPARSED:
 			if (--go->parse_length == 0)
 				go->state = STATE_DATA;
 			break;
 		}
 	}
 }
 EXPORT_SYMBOL(go7007_parse_video_stream);

 /*
  * Allocate a new go7007 struct.  Used by the hardware-specific probe.
  */
 struct go7007 *go7007_alloc(const struct go7007_board_info *board,
 						struct device *dev)
 {
 	struct go7007 *go;
 	int i;

 	go = kzalloc(sizeof(struct go7007), GFP_KERNEL);
 	if (go == NULL)
 		return NULL;
 	go->dev = dev;
 	go->board_info = board;
 	go->board_id = 0;
 	go->tuner_type = -1;
 	go->channel_number = 0;
 	go->name[0] = 0;
 	mutex_init(&go->hw_lock);
 	init_waitqueue_head(&go->frame_waitq);
 	spin_lock_init(&go->spinlock);
 	go->status = STATUS_INIT;
 	memset(&go->i2c_adapter, 0, sizeof(go->i2c_adapter));
 	go->i2c_adapter_online = 0;
 	go->interrupt_available = 0;
 	init_waitqueue_head(&go->interrupt_waitq);
 	go->input = 0;
 	go7007_update_board(go);
 	go->encoder_h_halve = 0;
 	go->encoder_v_halve = 0;
 	go->encoder_subsample = 0;
 	go->format = V4L2_PIX_FMT_MJPEG;
 	go->bitrate = 1500000;
 	go->fps_scale = 1;
 	go->pali = 0;
 	go->aspect_ratio = GO7007_RATIO_1_1;
 	go->gop_size = 0;
 	go->ipb = 0;
 	go->closed_gop = 0;
 	go->repeat_seqhead = 0;
 	go->seq_header_enable = 0;
 	go->gop_header_enable = 0;
 	go->dvd_mode = 0;
 	go->interlace_coding = 0;
 	for (i = 0; i < 4; ++i)
 		go->modet[i].enable = 0;
 	for (i = 0; i < 1624; ++i)
 		go->modet_map[i] = 0;
 	go->audio_deliver = NULL;
 	go->audio_enabled = 0;

 	return go;
 }
 EXPORT_SYMBOL(go7007_alloc);

 void go7007_update_board(struct go7007 *go)
 {
 	const struct go7007_board_info *board = go->board_info;

 	if (board->sensor_flags & GO7007_SENSOR_TV) {
 		go->standard = GO7007_STD_NTSC;
 		go->std = V4L2_STD_NTSC_M;
 		go->width = 720;
 		go->height = 480;
 		go->sensor_framerate = 30000;
 	} else {
 		go->standard = GO7007_STD_OTHER;
 		go->width = board->sensor_width;
 		go->height = board->sensor_height;
 		go->sensor_framerate = board->sensor_framerate;
 	}
 	go->encoder_v_offset = board->sensor_v_offset;
 	go->encoder_h_offset = board->sensor_h_offset;
 }
 EXPORT_SYMBOL(go7007_update_board);

 MODULE_LICENSE("GPL v2");
	/*
	* Copyright (C) 2005-2006 Micronas USA Inc.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License (Version 2) as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/module.h>
	#include <linux/delay.h>
	#include <linux/sched.h>
	#include <linux/spinlock.h>
	#include <linux/unistd.h>
	#include <linux/time.h>
	#include <linux/mm.h>
	#include <linux/vmalloc.h>
	#include <linux/device.h>
	#include <linux/i2c.h>
	#include <linux/firmware.h>
	#include <linux/mutex.h>
	#include <linux/uaccess.h>
	#include <linux/slab.h>
	#include <linux/videodev2.h>
	#include <media/tuner.h>
	#include <media/v4l2-common.h>
	#include <media/v4l2-event.h>

	#include "go7007-priv.h"

	/*
	* Wait for an interrupt to be delivered from the GO7007SB and return
	* the associated value and data.
	*
	* Must be called with the hw_lock held.
	*/
	int go7007_read_interrupt(struct go7007 go, u16 value, u16 *data)
	{
	go->interrupt_available = 0;
	go->hpi_ops->read_interrupt(go);
	if (wait_event_timeout(go->interrupt_waitq,
	go->interrupt_available, 5*HZ) < 0) {
	v4l2_err(&go->v4l2_dev, "timeout waiting for read interrupt\n");
	return -1;
	}
	if (!go->interrupt_available)
	return -1;
	go->interrupt_available = 0;
	*value = go->interrupt_value & 0xfffe;
	*data = go->interrupt_data;
	return 0;
	}
	EXPORT_SYMBOL(go7007_read_interrupt);

	/*
	* Read a register/address on the GO7007SB.
	*
	* Must be called with the hw_lock held.
	*/
	int go7007_read_addr(struct go7007 go, u16 addr, u16 data)
	{
	int count = 100;
	u16 value;

	if (go7007_write_interrupt(go, 0x0010, addr) < 0)
	return -EIO;
	while (count-- > 0) {
	if (go7007_read_interrupt(go, &value, data) == 0 &&
	value == 0xa000)
	return 0;
	}
	return -EIO;
	}
	EXPORT_SYMBOL(go7007_read_addr);

	/*
	* Send the boot firmware to the encoder, which just wakes it up and lets
	* us talk to the GPIO pins and on-board I2C adapter.
	*
	* Must be called with the hw_lock held.
	*/
	static int go7007_load_encoder(struct go7007 *go)
	{
	const struct firmware *fw_entry;
	char fw_name[] = "go7007/go7007fw.bin";
	void *bounce;
	int fw_len, rv = 0;
	u16 intr_val, intr_data;

	if (go->boot_fw == NULL) {
	if (request_firmware(&fw_entry, fw_name, go->dev)) {
	v4l2_err(go, "unable to load firmware from file \"%s\"\n", fw_name);
	return -1;
	}
	if (fw_entry->size < 16 \|\| memcmp(fw_entry->data, "WISGO7007FW", 11)) {
	v4l2_err(go, "file \"%s\" does not appear to be go7007 firmware\n", fw_name);
	release_firmware(fw_entry);
	return -1;
	}
	fw_len = fw_entry->size - 16;
	bounce = kmemdup(fw_entry->data + 16, fw_len, GFP_KERNEL);
	if (bounce == NULL) {
	v4l2_err(go, "unable to allocate %d bytes for firmware transfer\n", fw_len);
	release_firmware(fw_entry);
	return -1;
	}
	release_firmware(fw_entry);
	go->boot_fw_len = fw_len;
	go->boot_fw = bounce;
	}
	if (go7007_interface_reset(go) < 0 \|\|
	go7007_send_firmware(go, go->boot_fw, go->boot_fw_len) < 0 \|\|
	go7007_read_interrupt(go, &intr_val, &intr_data) < 0 \|\|
	(intr_val & ~0x1) != 0x5a5a) {
	v4l2_err(go, "error transferring firmware\n");
	rv = -1;
	}
	return rv;
	}

	MODULE_FIRMWARE("go7007/go7007fw.bin");

	/*
	* Boot the encoder and register the I2C adapter if requested. Do the
	* minimum initialization necessary, since the board-specific code may
	* still need to probe the board ID.
	*
	* Must NOT be called with the hw_lock held.
	*/
	int go7007_boot_encoder(struct go7007 *go, int init_i2c)
	{
	int ret;

	mutex_lock(&go->hw_lock);
	ret = go7007_load_encoder(go);
	mutex_unlock(&go->hw_lock);
	if (ret < 0)
	return -1;
	if (!init_i2c)
	return 0;
	if (go7007_i2c_init(go) < 0)
	return -1;
	go->i2c_adapter_online = 1;
	return 0;
	}
	EXPORT_SYMBOL(go7007_boot_encoder);

	/*
	* Configure any hardware-related registers in the GO7007, such as GPIO
	* pins and bus parameters, which are board-specific. This assumes
	* the boot firmware has already been downloaded.
	*
	* Must be called with the hw_lock held.
	*/
	static int go7007_init_encoder(struct go7007 *go)
	{
	if (go->board_info->audio_flags & GO7007_AUDIO_I2S_MASTER) {
	go7007_write_addr(go, 0x1000, 0x0811);
	go7007_write_addr(go, 0x1000, 0x0c11);
	}
	switch (go->board_id) {
	case GO7007_BOARDID_MATRIX_REV:
	/* Set GPIO pin 0 to be an output (audio clock control) */
	go7007_write_addr(go, 0x3c82, 0x0001);
	go7007_write_addr(go, 0x3c80, 0x00fe);
	break;
	case GO7007_BOARDID_ADLINK_MPG24:
	/* set GPIO5 to be an output, currently low */
	go7007_write_addr(go, 0x3c82, 0x0000);
	go7007_write_addr(go, 0x3c80, 0x00df);
	break;
	case GO7007_BOARDID_ADS_USBAV_709:
	/* GPIO pin 0: audio clock control */
	/* pin 2: TW9906 reset */
	/* pin 3: capture LED */
	go7007_write_addr(go, 0x3c82, 0x000d);
	go7007_write_addr(go, 0x3c80, 0x00f2);
	break;
	}
	return 0;
	}

	/*
	* Send the boot firmware to the GO7007 and configure the registers. This
	* is the only way to stop the encoder once it has started streaming video.
	*
	* Must be called with the hw_lock held.
	*/
	int go7007_reset_encoder(struct go7007 *go)
	{
	if (go7007_load_encoder(go) < 0)
	return -1;
	return go7007_init_encoder(go);
	}

	/*
	* Attempt to instantiate an I2C client by ID, probably loading a module.
	*/
	static int init_i2c_module(struct i2c_adapter adapter, const struct go_i2c const i2c)
	{
	struct go7007 *go = i2c_get_adapdata(adapter);
	struct v4l2_device *v4l2_dev = &go->v4l2_dev;
	struct v4l2_subdev *sd;
	struct i2c_board_info info;

	memset(&info, 0, sizeof(info));
	strlcpy(info.type, i2c->type, sizeof(info.type));
	info.addr = i2c->addr;
	info.flags = i2c->flags;

	sd = v4l2_i2c_new_subdev_board(v4l2_dev, adapter, &info, NULL);
	if (sd) {
	if (i2c->is_video)
	go->sd_video = sd;
	if (i2c->is_audio)
	go->sd_audio = sd;
	return 0;
	}

	pr_info("go7007: probing for module i2c:%s failed\n", i2c->type);
	return -EINVAL;
	}

	/*
	* Detach and unregister the encoder. The go7007 struct won't be freed
	* until v4l2 finishes releasing its resources and all associated fds are
	* closed by applications.
	*/
	static void go7007_remove(struct v4l2_device *v4l2_dev)
	{
	struct go7007 *go = container_of(v4l2_dev, struct go7007, v4l2_dev);

	v4l2_device_unregister(v4l2_dev);
	if (go->hpi_ops->release)
	go->hpi_ops->release(go);
	if (go->i2c_adapter_online) {
	i2c_del_adapter(&go->i2c_adapter);
	go->i2c_adapter_online = 0;
	}

	kfree(go->boot_fw);
	go7007_v4l2_remove(go);
	kfree(go);
	}

	/*
	* Finalize the GO7007 hardware setup, register the on-board I2C adapter
	* (if used on this board), load the I2C client driver for the sensor
	* (SAA7115 or whatever) and other devices, and register the ALSA and V4L2
	* interfaces.
	*
	* Must NOT be called with the hw_lock held.
	*/
	int go7007_register_encoder(struct go7007 *go, unsigned num_i2c_devs)
	{
	int i, ret;

	dev_info(go->dev, "go7007: registering new %s\n", go->name);

	go->v4l2_dev.release = go7007_remove;
	ret = v4l2_device_register(go->dev, &go->v4l2_dev);
	if (ret < 0)
	return ret;

	mutex_lock(&go->hw_lock);
	ret = go7007_init_encoder(go);
	mutex_unlock(&go->hw_lock);
	if (ret < 0)
	return ret;

	ret = go7007_v4l2_ctrl_init(go);
	if (ret < 0)
	return ret;

	if (!go->i2c_adapter_online &&
	go->board_info->flags & GO7007_BOARD_USE_ONBOARD_I2C) {
	ret = go7007_i2c_init(go);
	if (ret < 0)
	return ret;
	go->i2c_adapter_online = 1;
	}
	if (go->i2c_adapter_online) {
	if (go->board_id == GO7007_BOARDID_ADS_USBAV_709) {
	/* Reset the TW9906 */
	go7007_write_addr(go, 0x3c82, 0x0009);
	msleep(50);
	go7007_write_addr(go, 0x3c82, 0x000d);
	}
	for (i = 0; i < num_i2c_devs; ++i)
	init_i2c_module(&go->i2c_adapter, &go->board_info->i2c_devs[i]);

	if (go->tuner_type >= 0) {
	struct tuner_setup setup = {
	.addr = ADDR_UNSET,
	.type = go->tuner_type,
	.mode_mask = T_ANALOG_TV,
	};

	v4l2_device_call_all(&go->v4l2_dev, 0, tuner,
	s_type_addr, &setup);
	}
	if (go->board_id == GO7007_BOARDID_ADLINK_MPG24)
	v4l2_subdev_call(go->sd_video, video, s_routing,
	0, 0, go->channel_number + 1);
	}

	ret = go7007_v4l2_init(go);
	if (ret < 0)
	return ret;

	if (go->board_info->flags & GO7007_BOARD_HAS_AUDIO) {
	go->audio_enabled = 1;
	go7007_snd_init(go);
	}
	return 0;
	}
	EXPORT_SYMBOL(go7007_register_encoder);

	/*
	* Send the encode firmware to the encoder, which will cause it
	* to immediately start delivering the video and audio streams.
	*
	* Must be called with the hw_lock held.
	*/
	int go7007_start_encoder(struct go7007 *go)
	{
	u8 *fw;
	int fw_len, rv = 0, i, x, y;
	u16 intr_val, intr_data;

	go->modet_enable = 0;
	for (i = 0; i < 4; i++)
	go->modet[i].enable = 0;

	switch (v4l2_ctrl_g_ctrl(go->modet_mode)) {
	case V4L2_DETECT_MD_MODE_GLOBAL:
	memset(go->modet_map, 0, sizeof(go->modet_map));
	go->modet[0].enable = 1;
	go->modet_enable = 1;
	break;
	case V4L2_DETECT_MD_MODE_REGION_GRID:
	for (y = 0; y < go->height / 16; y++) {
	for (x = 0; x < go->width / 16; x++) {
	int idx = y * go->width / 16 + x;

	go->modet[go->modet_map[idx]].enable = 1;
	}
	}
	go->modet_enable = 1;
	break;
	}

	if (go->dvd_mode)
	go->modet_enable = 0;

	if (go7007_construct_fw_image(go, &fw, &fw_len) < 0)
	return -1;

	if (go7007_send_firmware(go, fw, fw_len) < 0 \|\|
	go7007_read_interrupt(go, &intr_val, &intr_data) < 0) {
	v4l2_err(&go->v4l2_dev, "error transferring firmware\n");
	rv = -1;
	goto start_error;
	}

	go->state = STATE_DATA;
	go->parse_length = 0;
	go->seen_frame = 0;
	if (go7007_stream_start(go) < 0) {
	v4l2_err(&go->v4l2_dev, "error starting stream transfer\n");
	rv = -1;
	goto start_error;
	}

	start_error:
	kfree(fw);
	return rv;
	}

	/*
	* Store a byte in the current video buffer, if there is one.
	*/
	static inline void store_byte(struct go7007_buffer *vb, u8 byte)
	{
	if (vb && vb->vb.v4l2_planes[0].bytesused < GO7007_BUF_SIZE) {
	u8 *ptr = vb2_plane_vaddr(&vb->vb, 0);

	ptr[vb->vb.v4l2_planes[0].bytesused++] = byte;
	}
	}

	static void go7007_set_motion_regions(struct go7007 go, struct go7007_buffer vb,
	u32 motion_regions)
	{
	if (motion_regions != go->modet_event_status) {
	struct v4l2_event ev = {
	.type = V4L2_EVENT_MOTION_DET,
	.u.motion_det = {
	.flags = V4L2_EVENT_MD_FL_HAVE_FRAME_SEQ,
	.frame_sequence = vb->vb.v4l2_buf.sequence,
	.region_mask = motion_regions,
	},
	};

	v4l2_event_queue(&go->vdev, &ev);
	go->modet_event_status = motion_regions;
	}
	}

	/*
	* Determine regions with motion and send a motion detection event
	* in case of changes.
	*/
	static void go7007_motion_regions(struct go7007 go, struct go7007_buffer vb)
	{
	u32 *bytesused = &vb->vb.v4l2_planes[0].bytesused;
	unsigned motion[4] = { 0, 0, 0, 0 };
	u32 motion_regions = 0;
	unsigned stride = (go->width + 7) >> 3;
	unsigned x, y;
	int i;

	for (i = 0; i < 216; ++i)
	store_byte(vb, go->active_map[i]);
	for (y = 0; y < go->height / 16; y++) {
	for (x = 0; x < go->width / 16; x++) {
	if (!(go->active_map[y * stride + (x >> 3)] & (1 << (x & 7))))
	continue;
	motion[go->modet_map[y * (go->width / 16) + x]]++;
	}
	}
	motion_regions = ((motion[0] > 0) << 0) \|
	((motion[1] > 0) << 1) \|
	((motion[2] > 0) << 2) \|
	((motion[3] > 0) << 3);
	*bytesused -= 216;
	go7007_set_motion_regions(go, vb, motion_regions);
	}

	/*
	* Deliver the last video buffer and get a new one to start writing to.
	*/
	static struct go7007_buffer frame_boundary(struct go7007 go, struct go7007_buffer *vb)
	{
	u32 *bytesused = &vb->vb.v4l2_planes[0].bytesused;
	struct go7007_buffer *vb_tmp = NULL;

	if (vb == NULL) {
	spin_lock(&go->spinlock);
	if (!list_empty(&go->vidq_active))
	vb = go->active_buf =
	list_first_entry(&go->vidq_active, struct go7007_buffer, list);
	spin_unlock(&go->spinlock);
	go->next_seq++;
	return vb;
	}

	vb->vb.v4l2_buf.sequence = go->next_seq++;
	if (vb->modet_active && *bytesused + 216 < GO7007_BUF_SIZE)
	go7007_motion_regions(go, vb);
	else
	go7007_set_motion_regions(go, vb, 0);

	v4l2_get_timestamp(&vb->vb.v4l2_buf.timestamp);
	vb_tmp = vb;
	spin_lock(&go->spinlock);
	list_del(&vb->list);
	if (list_empty(&go->vidq_active))
	vb = NULL;
	else
	vb = list_first_entry(&go->vidq_active, struct go7007_buffer, list);
	go->active_buf = vb;
	spin_unlock(&go->spinlock);
	vb2_buffer_done(&vb_tmp->vb, VB2_BUF_STATE_DONE);
	return vb;
	}

	static void write_bitmap_word(struct go7007 *go)
	{
	int x, y, i, stride = ((go->width >> 4) + 7) >> 3;

	for (i = 0; i < 16; ++i) {
	y = (((go->parse_length - 1) << 3) + i) / (go->width >> 4);
	x = (((go->parse_length - 1) << 3) + i) % (go->width >> 4);
	if (stride * y + (x >> 3) < sizeof(go->active_map))
	go->active_map[stride * y + (x >> 3)] \|=
	(go->modet_word & 1) << (x & 0x7);
	go->modet_word >>= 1;
	}
	}

	/*
	* Parse a chunk of the video stream into frames. The frames are not
	* delimited by the hardware, so we have to parse the frame boundaries
	* based on the type of video stream we're receiving.
	*/
	void go7007_parse_video_stream(struct go7007 go, u8 buf, int length)
	{
	struct go7007_buffer *vb = go->active_buf;
	int i, seq_start_code = -1, gop_start_code = -1, frame_start_code = -1;

	switch (go->format) {
	case V4L2_PIX_FMT_MPEG4:
	seq_start_code = 0xB0;
	gop_start_code = 0xB3;
	frame_start_code = 0xB6;
	break;
	case V4L2_PIX_FMT_MPEG1:
	case V4L2_PIX_FMT_MPEG2:
	seq_start_code = 0xB3;
	gop_start_code = 0xB8;
	frame_start_code = 0x00;
	break;
	}

	for (i = 0; i < length; ++i) {
	if (vb && vb->vb.v4l2_planes[0].bytesused >= GO7007_BUF_SIZE - 3) {
	v4l2_info(&go->v4l2_dev, "dropping oversized frame\n");
	vb->vb.v4l2_planes[0].bytesused = 0;
	vb->frame_offset = 0;
	vb->modet_active = 0;
	vb = go->active_buf = NULL;
	}

	switch (go->state) {
	case STATE_DATA:
	switch (buf[i]) {
	case 0x00:
	go->state = STATE_00;
	break;
	case 0xFF:
	go->state = STATE_FF;
	break;
	default:
	store_byte(vb, buf[i]);
	break;
	}
	break;
	case STATE_00:
	switch (buf[i]) {
	case 0x00:
	go->state = STATE_00_00;
	break;
	case 0xFF:
	store_byte(vb, 0x00);
	go->state = STATE_FF;
	break;
	default:
	store_byte(vb, 0x00);
	store_byte(vb, buf[i]);
	go->state = STATE_DATA;
	break;
	}
	break;
	case STATE_00_00:
	switch (buf[i]) {
	case 0x00:
	store_byte(vb, 0x00);
	/* go->state remains STATE_00_00 */
	break;
	case 0x01:
	go->state = STATE_00_00_01;
	break;
	case 0xFF:
	store_byte(vb, 0x00);
	store_byte(vb, 0x00);
	go->state = STATE_FF;
	break;
	default:
	store_byte(vb, 0x00);
	store_byte(vb, 0x00);
	store_byte(vb, buf[i]);
	go->state = STATE_DATA;
	break;
	}
	break;
	case STATE_00_00_01:
	if (buf[i] == 0xF8 && go->modet_enable == 0) {
	/* MODET start code, but MODET not enabled */
	store_byte(vb, 0x00);
	store_byte(vb, 0x00);
	store_byte(vb, 0x01);
	store_byte(vb, 0xF8);
	go->state = STATE_DATA;
	break;
	}
	/* If this is the start of a new MPEG frame,
	* get a new buffer */
	if ((go->format == V4L2_PIX_FMT_MPEG1 \|\|
	go->format == V4L2_PIX_FMT_MPEG2 \|\|
	go->format == V4L2_PIX_FMT_MPEG4) &&
	(buf[i] == seq_start_code \|\|
	buf[i] == gop_start_code \|\|
	buf[i] == frame_start_code)) {
	if (vb == NULL \|\| go->seen_frame)
	vb = frame_boundary(go, vb);
	go->seen_frame = buf[i] == frame_start_code;
	if (vb && go->seen_frame)
	vb->frame_offset = vb->vb.v4l2_planes[0].bytesused;
	}
	/* Handle any special chunk types, or just write the
	* start code to the (potentially new) buffer */
	switch (buf[i]) {
	case 0xF5: /* timestamp */
	go->parse_length = 12;
	go->state = STATE_UNPARSED;
	break;
	case 0xF6: /* vbi */
	go->state = STATE_VBI_LEN_A;
	break;
	case 0xF8: /* MD map */
	go->parse_length = 0;
	memset(go->active_map, 0,
	sizeof(go->active_map));
	go->state = STATE_MODET_MAP;
	break;
	case 0xFF: /* Potential JPEG start code */
	store_byte(vb, 0x00);
	store_byte(vb, 0x00);
	store_byte(vb, 0x01);
	go->state = STATE_FF;
	break;
	default:
	store_byte(vb, 0x00);
	store_byte(vb, 0x00);
	store_byte(vb, 0x01);
	store_byte(vb, buf[i]);
	go->state = STATE_DATA;
	break;
	}
	break;
	case STATE_FF:
	switch (buf[i]) {
	case 0x00:
	store_byte(vb, 0xFF);
	go->state = STATE_00;
	break;
	case 0xFF:
	store_byte(vb, 0xFF);
	/* go->state remains STATE_FF */
	break;
	case 0xD8:
	if (go->format == V4L2_PIX_FMT_MJPEG)
	vb = frame_boundary(go, vb);
	/* fall through */
	default:
	store_byte(vb, 0xFF);
	store_byte(vb, buf[i]);
	go->state = STATE_DATA;
	break;
	}
	break;
	case STATE_VBI_LEN_A:
	go->parse_length = buf[i] << 8;
	go->state = STATE_VBI_LEN_B;
	break;
	case STATE_VBI_LEN_B:
	go->parse_length \|= buf[i];
	if (go->parse_length > 0)
	go->state = STATE_UNPARSED;
	else
	go->state = STATE_DATA;
	break;
	case STATE_MODET_MAP:
	if (go->parse_length < 204) {
	if (go->parse_length & 1) {
	go->modet_word \|= buf[i];
	write_bitmap_word(go);
	} else
	go->modet_word = buf[i] << 8;
	} else if (go->parse_length == 207 && vb) {
	vb->modet_active = buf[i];
	}
	if (++go->parse_length == 208)
	go->state = STATE_DATA;
	break;
	case STATE_UNPARSED:
	if (--go->parse_length == 0)
	go->state = STATE_DATA;
	break;
	}
	}
	}
	EXPORT_SYMBOL(go7007_parse_video_stream);

	/*
	* Allocate a new go7007 struct. Used by the hardware-specific probe.
	*/
	struct go7007 go7007_alloc(const struct go7007_board_info board,
	struct device *dev)
	{
	struct go7007 *go;
	int i;

	go = kzalloc(sizeof(struct go7007), GFP_KERNEL);
	if (go == NULL)
	return NULL;
	go->dev = dev;
	go->board_info = board;
	go->board_id = 0;
	go->tuner_type = -1;
	go->channel_number = 0;
	go->name[0] = 0;
	mutex_init(&go->hw_lock);
	init_waitqueue_head(&go->frame_waitq);
	spin_lock_init(&go->spinlock);
	go->status = STATUS_INIT;
	memset(&go->i2c_adapter, 0, sizeof(go->i2c_adapter));
	go->i2c_adapter_online = 0;
	go->interrupt_available = 0;
	init_waitqueue_head(&go->interrupt_waitq);
	go->input = 0;
	go7007_update_board(go);
	go->encoder_h_halve = 0;
	go->encoder_v_halve = 0;
	go->encoder_subsample = 0;
	go->format = V4L2_PIX_FMT_MJPEG;
	go->bitrate = 1500000;
	go->fps_scale = 1;
	go->pali = 0;
	go->aspect_ratio = GO7007_RATIO_1_1;
	go->gop_size = 0;
	go->ipb = 0;
	go->closed_gop = 0;
	go->repeat_seqhead = 0;
	go->seq_header_enable = 0;
	go->gop_header_enable = 0;
	go->dvd_mode = 0;
	go->interlace_coding = 0;
	for (i = 0; i < 4; ++i)
	go->modet[i].enable = 0;
	for (i = 0; i < 1624; ++i)
	go->modet_map[i] = 0;
	go->audio_deliver = NULL;
	go->audio_enabled = 0;

	return go;
	}
	EXPORT_SYMBOL(go7007_alloc);

	void go7007_update_board(struct go7007 *go)
	{
	const struct go7007_board_info *board = go->board_info;

	if (board->sensor_flags & GO7007_SENSOR_TV) {
	go->standard = GO7007_STD_NTSC;
	go->std = V4L2_STD_NTSC_M;
	go->width = 720;
	go->height = 480;
	go->sensor_framerate = 30000;
	} else {
	go->standard = GO7007_STD_OTHER;
	go->width = board->sensor_width;
	go->height = board->sensor_height;
	go->sensor_framerate = board->sensor_framerate;
	}
	go->encoder_v_offset = board->sensor_v_offset;
	go->encoder_h_offset = board->sensor_h_offset;
	}
	EXPORT_SYMBOL(go7007_update_board);

	MODULE_LICENSE("GPL v2");