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/* Driver for Bt832 CMOS Camera Video Processor
i2c-addresses: 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 <media/audiochip.h>
#include <media/id.h>
#include "bttv.h"
#include "bt832.h"
MODULE_LICENSE("GPL");
/* Addresses to scan */
static unsigned short normal_i2c[] = { 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);
// 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);
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, 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;
i2c_set_clientdata(&t->client, t);
i2c_attach_client(&t->client);
if(! bt832_init(&t->client)) {
bt832_detach(&t->client);
return -1;
}
return 0;
}
static int bt832_probe(struct i2c_adapter *adap)
{
#ifdef I2C_CLASS_TV_ANALOG
if (adap->class & I2C_CLASS_TV_ANALOG)
return i2c_probe(adap, &addr_data, bt832_attach);
#else
if (adap->id == (I2C_ALGO_BIT | I2C_HW_B_BT848))
return i2c_probe(adap, &addr_data, bt832_attach);
#endif
return 0;
}
static int bt832_detach(struct i2c_client *client)
{
struct bt832 *t = i2c_get_clientdata(client);
printk("bt832: detach.\n");
i2c_detach_client(client);
kfree(t);
return 0;
}
static int
bt832_command(struct i2c_client *client, unsigned int cmd, void *arg)
{
struct bt832 *t = i2c_get_clientdata(client);
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 = {
.owner = THIS_MODULE,
.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 =
{
I2C_DEVNAME("bt832"),
.flags = I2C_CLIENT_ALLOW_USE,
.driver = &driver,
};
static int __init bt832_init_module(void)
{
return i2c_add_driver(&driver);
}
static void __exit bt832_cleanup_module(void)
{
i2c_del_driver(&driver);
}
module_init(bt832_init_module);
module_exit(bt832_cleanup_module);
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* ---------------------------------------------------------------------------
* Local variables:
* c-basic-offset: 8
* End:
*/
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