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/* Driver for Bt832 CMOS Camera Video Processor

    i2c-adresses: 0x88 or 0x8a

  The BT832 interfaces to a Quartzsight Digital Camera (352x288, 25 or 30 fps)

  via a 9 pin connector ( 4-wire SDATA, 2-wire i2c, SCLK, VCC, GND).

  It outputs an 8-bit 4:2:2 YUV or YCrCb video signal which can be directly

  connected to bt848/bt878 GPIO pins on this purpose.

  (see: VLSI Vision Ltd. www.vvl.co.uk for camera datasheets)

  Supported Cards:

  -  Pixelview Rev.4E: 0x8a

                GPIO 0x400000 toggles Bt832 RESET, and the chip changes to i2c 0x88 !

  (c) Gunther Mayer, 2002

  STATUS:

  - detect chip and hexdump

  - reset chip and leave low power mode

  - detect camera present

  TODO:

  - make it work (find correct setup for Bt832 and Bt878)

*/

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/i2c.h>

#include <linux/types.h>

#include <linux/videodev.h>

#include <linux/init.h>

#include <linux/errno.h>

#include <linux/slab.h>

#include "id.h"

#include "audiochip.h"

#include "bttv.h"

#include "bt832.h"

MODULE_LICENSE("GPL");

/* Addresses to scan */

static unsigned short normal_i2c[] = {I2C_CLIENT_END};

static unsigned short normal_i2c_range[] = {I2C_BT832_ALT1>>1,I2C_BT832_ALT2>>1,I2C_CLIENT_END};

I2C_CLIENT_INSMOD;

/* ---------------------------------------------------------------------- */

#define dprintk     if (debug) printk

static int bt832_detach(struct i2c_client *client);

static struct i2c_driver driver;

static struct i2c_client client_template;

struct bt832 {

        struct i2c_client client;

};

int bt832_hexdump(struct i2c_client *i2c_client_s, unsigned char *buf)

{

        int i,rc;

        buf[0]=0x80; // start at register 0 with auto-increment

        if (1 != (rc = i2c_master_send(i2c_client_s,buf,1)))

                printk("bt832: i2c i/o error: rc == %d (should be 1)\n",rc);

        for(i=0;i<65;i++)

                buf[i]=0;

        if (65 != (rc=i2c_master_recv(i2c_client_s,buf,65)))

                printk("bt832: i2c i/o error: rc == %d (should be 65)\n",rc);

        // Note: On READ the first byte is the current index

        //  (e.g. 0x80, what we just wrote)

        if(1) {

                int i;

                printk("BT832 hexdump:\n");

                for(i=1;i<65;i++) {

                        if(i!=1) {

                          if(((i-1)%8)==0) printk(" ");

                          if(((i-1)%16)==0) printk("\n");

                        }

                        printk(" %02x",buf[i]);

                }

                printk("\n");

        }

        return 0;

}

// Return: 1 (is a bt832), 0 (No bt832 here)

int bt832_init(struct i2c_client *i2c_client_s)

{

        unsigned char *buf;

        int rc;

        buf=kmalloc(65,GFP_KERNEL);

        bt832_hexdump(i2c_client_s,buf);

        if(buf[0x40] != 0x31) {

                printk("bt832: this i2c chip is no bt832 (id=%02x). Detaching.\n",buf[0x40]);

                kfree(buf);

                return 0;

        }

        printk("Write 0 tp VPSTATUS\n");

        buf[0]=BT832_VP_STATUS; // Reg.52

        buf[1]= 0x00;

        if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))

                printk("bt832: i2c i/o error VPS: rc == %d (should be 2)\n",rc);

        bt832_hexdump(i2c_client_s,buf);

        // Leave low power mode:

        printk("Bt832: leave low power mode.\n");

        buf[0]=BT832_CAM_SETUP0; //0x39 57

        buf[1]=0x08;

        if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))

                printk("bt832: i2c i/o error LLPM: rc == %d (should be 2)\n",rc);

        bt832_hexdump(i2c_client_s,buf);

        printk("Write 0 tp VPSTATUS\n");

        buf[0]=BT832_VP_STATUS; // Reg.52

        buf[1]= 0x00;

        if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))

                printk("bt832: i2c i/o error VPS: rc == %d (should be 2)\n",rc);

        bt832_hexdump(i2c_client_s,buf);

        // Enable Output

        printk("Enable Output\n");

        buf[0]=BT832_VP_CONTROL1; // Reg.40

        buf[1]= 0x27 & (~0x01); // Default | !skip

        if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))

                printk("bt832: i2c i/o error EO: rc == %d (should be 2)\n",rc);

        bt832_hexdump(i2c_client_s,buf);

#if 0

        // Full 30/25 Frame rate

        printk("Full 30/25 Frame rate\n");

        buf[0]=BT832_VP_CONTROL0; // Reg.39

        buf[1]= 0x00;

        if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))

                printk("bt832: i2c i/o error FFR: rc == %d (should be 2)\n",rc);

        bt832_hexdump(i2c_client_s,buf);

#endif

#if 1

        // for testing (even works when no camera attached)

        printk("bt832: *** Generate NTSC M Bars *****\n");

        buf[0]=BT832_VP_TESTCONTROL0; // Reg. 42

        buf[1]=3; // Generate NTSC System M bars, Generate Frame timing internally

        if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))

                printk("bt832: i2c i/o error MBAR: rc == %d (should be 2)\n",rc);

#endif

        printk("Bt832: Camera Present: %s\n",

                (buf[1+BT832_CAM_STATUS] & BT832_56_CAMERA_PRESENT) ? "yes":"no");

        bt832_hexdump(i2c_client_s,buf);

        kfree(buf);

        return 1;

}

static int bt832_attach(struct i2c_adapter *adap, int addr,

                          unsigned short flags, int kind)

{

        struct bt832 *t;

        printk("bt832_attach\n");

        client_template.adapter = adap;

        client_template.addr    = addr;

        printk("bt832: chip found @ 0x%x\n", addr<<1);

        if (NULL == (t = kmalloc(sizeof(*t), GFP_KERNEL)))

                return -ENOMEM;

        memset(t,0,sizeof(*t));

        t->client = client_template;

        t->client.data = t;

        i2c_attach_client(&t->client);

        MOD_INC_USE_COUNT;

        if(! bt832_init(&t->client)) {

                bt832_detach(&t->client);

                return -1;

        }

        return 0;

}

static int bt832_probe(struct i2c_adapter *adap)

{

        int rc;

        printk("bt832_probe\n");

        switch (adap->id) {

        case I2C_ALGO_BIT | I2C_HW_B_BT848:

        case I2C_ALGO_BIT | I2C_HW_B_RIVA:

        case I2C_ALGO_SAA7134:

                printk("bt832: probing %s i2c adapter [id=0x%x]\n",

                       adap->name,adap->id);

                rc = i2c_probe(adap, &addr_data, bt832_attach);

                break;

        default:

                printk("bt832: ignoring %s i2c adapter [id=0x%x]\n",

                       adap->name,adap->id);

                rc = 0;

                /* nothing */

        }

        return rc;

}

static int bt832_detach(struct i2c_client *client)

{

        struct bt832 *t = (struct bt832*)client->data;

        printk("bt832: detach.\n");

        i2c_detach_client(client);

        kfree(t);

        MOD_DEC_USE_COUNT;

        return 0;

}

static int

bt832_command(struct i2c_client *client, unsigned int cmd, void *arg)

{

        struct bt832 *t = (struct bt832*)client->data;

        printk("bt832: command %x\n",cmd);

        switch (cmd) {

                case BT832_HEXDUMP: {

                        unsigned char *buf;

                        buf=kmalloc(65,GFP_KERNEL);

                        bt832_hexdump(&t->client,buf);

                        kfree(buf);

                }

                break;

                case BT832_REATTACH:

                        printk("bt832: re-attach\n");

                        i2c_del_driver(&driver);

                        i2c_add_driver(&driver);

                break;

        }

        return 0;

}

/* ----------------------------------------------------------------------- */

static struct i2c_driver driver = {

        .name           = "i2c bt832 driver",

        .id             = -1, /* FIXME */

        .flags          = I2C_DF_NOTIFY,

        .attach_adapter = bt832_probe,

        .detach_client  = bt832_detach,

        .command        = bt832_command,

};

static struct i2c_client client_template =

{

        .name   = "bt832",

        .flags  = I2C_CLIENT_ALLOW_USE,

        .driver = &driver,

};

int bt832_init_module(void)

{

        i2c_add_driver(&driver);

        return 0;

}

static void bt832_cleanup_module(void)

{

        i2c_del_driver(&driver);

}

module_init(bt832_init_module);

module_exit(bt832_cleanup_module);