/*
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 */

#include <linux/module.h>
#include <linux/init.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 <asm/system.h>
#include <linux/videodev2.h>
#include <media/tuner.h>
#include <media/v4l2-common.h>

#include "go7007-priv.h"
#include "wis-i2c.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[] = "go7007fw.bin";
        void *bounce;
        int fw_len, rv = 0;
        u16 intr_val, intr_data;

        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 = kmalloc(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;
        }
        memcpy(bounce, fw_entry->data + 16, fw_len);
        release_firmware(fw_entry);
        if (go7007_interface_reset(go) < 0 ||
                        go7007_send_firmware(go, bounce, 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;
        }
        kfree(bounce);
        return rv;
}

MODULE_FIRMWARE("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);
        }
        if (go->board_id == 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);
        }
        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 char *type,
                           int addr)
{
        struct go7007 *go = i2c_get_adapdata(adapter);
        struct v4l2_device *v4l2_dev = &go->v4l2_dev;

        if (v4l2_i2c_new_subdev(v4l2_dev, adapter, type, addr, NULL))
                return 0;

        printk(KERN_INFO "go7007: probing for module i2c:%s failed\n", type);
        return -1;
}

/*
 * 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)
{
        int i, ret;

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

        mutex_lock(&go->hw_lock);
        ret = go7007_init_encoder(go);
        mutex_unlock(&go->hw_lock);
        if (ret < 0)
                return -1;

        /* v4l2 init must happen before i2c subdevs */
        ret = go7007_v4l2_init(go);
        if (ret < 0)
                return ret;

        if (!go->i2c_adapter_online &&
                        go->board_info->flags & GO7007_BOARD_USE_ONBOARD_I2C) {
                if (go7007_i2c_init(go) < 0)
                        return -1;
                go->i2c_adapter_online = 1;
        }
        if (go->i2c_adapter_online) {
                for (i = 0; i < go->board_info->num_i2c_devs; ++i)
                        init_i2c_module(&go->i2c_adapter,
                                        go->board_info->i2c_devs[i].type,
                                        go->board_info->i2c_devs[i].addr);
                if (go->board_id == GO7007_BOARDID_ADLINK_MPG24)
                        i2c_clients_command(&go->i2c_adapter,
                                DECODER_SET_CHANNEL, &go->channel_number);
        }
        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;
        u16 intr_val, intr_data;

        go->modet_enable = 0;
        if (!go->dvd_mode)
                for (i = 0; i < 4; ++i) {
                        if (go->modet[i].enable) {
                                go->modet_enable = 1;
                                continue;
                        }
                        go->modet[i].pixel_threshold = 32767;
                        go->modet[i].motion_threshold = 32767;
                        go->modet[i].mb_threshold = 32767;
                }

        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 *gobuf, u8 byte)
{
        if (gobuf != NULL && gobuf->bytesused < GO7007_BUF_SIZE) {
                unsigned int pgidx = gobuf->offset >> PAGE_SHIFT;
                unsigned int pgoff = gobuf->offset & ~PAGE_MASK;

                *((u8 *)page_address(gobuf->pages[pgidx]) + pgoff) = byte;
                ++gobuf->offset;
                ++gobuf->bytesused;
        }
}

/*
 * Deliver the last video buffer and get a new one to start writing to.
 */
static void frame_boundary(struct go7007 *go)
{
        struct go7007_buffer *gobuf;
        int i;

        if (go->active_buf) {
                if (go->active_buf->modet_active) {
                        if (go->active_buf->bytesused + 216 < GO7007_BUF_SIZE) {
                                for (i = 0; i < 216; ++i)
                                        store_byte(go->active_buf,
                                                        go->active_map[i]);
                                go->active_buf->bytesused -= 216;
                        } else
                                go->active_buf->modet_active = 0;
                }
                go->active_buf->state = BUF_STATE_DONE;
                wake_up_interruptible(&go->frame_waitq);
                go->active_buf = NULL;
        }
        list_for_each_entry(gobuf, &go->stream, stream)
                if (gobuf->state == BUF_STATE_QUEUED) {
                        gobuf->seq = go->next_seq;
                        do_gettimeofday(&gobuf->timestamp);
                        go->active_buf = gobuf;
                        break;
                }
        ++go->next_seq;
}

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)
{
        int i, seq_start_code = -1, frame_start_code = -1;

        spin_lock(&go->spinlock);

        switch (go->format) {
        case GO7007_FORMAT_MPEG4:
                seq_start_code = 0xB0;
                frame_start_code = 0xB6;
                break;
        case GO7007_FORMAT_MPEG1:
        case GO7007_FORMAT_MPEG2:
                seq_start_code = 0xB3;
                frame_start_code = 0x00;
                break;
        }

        for (i = 0; i < length; ++i) {
                if (go->active_buf != NULL &&
                            go->active_buf->bytesused >= GO7007_BUF_SIZE - 3) {
                        v4l2_info(&go->v4l2_dev, "dropping oversized frame\n");
                        go->active_buf->offset -= go->active_buf->bytesused;
                        go->active_buf->bytesused = 0;
                        go->active_buf->modet_active = 0;
                        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(go->active_buf, buf[i]);
                                break;
                        }
                        break;
                case STATE_00:
                        switch (buf[i]) {
                        case 0x00:
                                go->state = STATE_00_00;
                                break;
                        case 0xFF:
                                store_byte(go->active_buf, 0x00);
                                go->state = STATE_FF;
                                break;
                        default:
                                store_byte(go->active_buf, 0x00);
                                store_byte(go->active_buf, buf[i]);
                                go->state = STATE_DATA;
                                break;
                        }
                        break;
                case STATE_00_00:
                        switch (buf[i]) {
                        case 0x00:
                                store_byte(go->active_buf, 0x00);
                                /* go->state remains STATE_00_00 */
                                break;
                        case 0x01:
                                go->state = STATE_00_00_01;
                                break;
                        case 0xFF:
                                store_byte(go->active_buf, 0x00);
                                store_byte(go->active_buf, 0x00);
                                go->state = STATE_FF;
                                break;
                        default:
                                store_byte(go->active_buf, 0x00);
                                store_byte(go->active_buf, 0x00);
                                store_byte(go->active_buf, 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(go->active_buf, 0x00);
                                store_byte(go->active_buf, 0x00);
                                store_byte(go->active_buf, 0x01);
                                store_byte(go->active_buf, 0xF8);
                                go->state = STATE_DATA;
                                break;
                        }
                        /* If this is the start of a new MPEG frame,
                         * get a new buffer */
                        if ((go->format == GO7007_FORMAT_MPEG1 ||
                                        go->format == GO7007_FORMAT_MPEG2 ||
                                        go->format == GO7007_FORMAT_MPEG4) &&
                                        (buf[i] == seq_start_code ||
                                                buf[i] == 0xB8 || /* GOP code */
                                                buf[i] == frame_start_code)) {
                                if (go->active_buf == NULL || go->seen_frame)
                                        frame_boundary(go);
                                if (buf[i] == frame_start_code) {
                                        if (go->active_buf != NULL)
                                                go->active_buf->frame_offset =
                                                        go->active_buf->offset;
                                        go->seen_frame = 1;
                                } else {
                                        go->seen_frame = 0;
                                }
                        }
                        /* 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(go->active_buf, 0x00);
                                store_byte(go->active_buf, 0x00);
                                store_byte(go->active_buf, 0x01);
                                go->state = STATE_FF;
                                break;
                        default:
                                store_byte(go->active_buf, 0x00);
                                store_byte(go->active_buf, 0x00);
                                store_byte(go->active_buf, 0x01);
                                store_byte(go->active_buf, buf[i]);
                                go->state = STATE_DATA;
                                break;
                        }
                        break;
                case STATE_FF:
                        switch (buf[i]) {
                        case 0x00:
                                store_byte(go->active_buf, 0xFF);
                                go->state = STATE_00;
                                break;
                        case 0xFF:
                                store_byte(go->active_buf, 0xFF);
                                /* go->state remains STATE_FF */
                                break;
                        case 0xD8:
                                if (go->format == GO7007_FORMAT_MJPEG)
                                        frame_boundary(go);
                                /* fall through */
                        default:
                                store_byte(go->active_buf, 0xFF);
                                store_byte(go->active_buf, 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 && go->active_buf) {
                                go->active_buf->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;
                }
        }

        spin_unlock(&go->spinlock);
}
EXPORT_SYMBOL(go7007_parse_video_stream);

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

        go = kmalloc(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->video_dev = NULL;
        go->ref_count = 0;
        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->in_use = 0;
        go->input = 0;
        if (board->sensor_flags & GO7007_SENSOR_TV) {
                go->standard = GO7007_STD_NTSC;
                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;
        go->encoder_h_halve = 0;
        go->encoder_v_halve = 0;
        go->encoder_subsample = 0;
        go->streaming = 0;
        go->format = GO7007_FORMAT_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;
        INIT_LIST_HEAD(&go->stream);

        return go;
}
EXPORT_SYMBOL(go7007_alloc);

/*
 * 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.
 */
void go7007_remove(struct go7007 *go)
{
        if (go->i2c_adapter_online) {
                if (i2c_del_adapter(&go->i2c_adapter) == 0)
                        go->i2c_adapter_online = 0;
                else
                        v4l2_err(&go->v4l2_dev,
                                "error removing I2C adapter!\n");
        }

        if (go->audio_enabled)
                go7007_snd_remove(go);
        go7007_v4l2_remove(go);
}
EXPORT_SYMBOL(go7007_remove);

MODULE_LICENSE("GPL v2");