276 lines
6.5 KiB
C
276 lines
6.5 KiB
C
/* 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/v4l2-common.h>
|
|
|
|
#include "bttv.h"
|
|
#include "bt832.h"
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
/* Addresses to scan */
|
|
static unsigned short normal_i2c[] = { I2C_ADDR_BT832_ALT1>>1, I2C_ADDR_BT832_ALT2>>1,
|
|
I2C_CLIENT_END };
|
|
I2C_CLIENT_INSMOD;
|
|
|
|
int debug; /* debug output */
|
|
module_param(debug, int, 0644);
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
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)))
|
|
v4l_err(i2c_client_s,"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)))
|
|
v4l_err(i2c_client_s,"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(debug>1) {
|
|
int i;
|
|
v4l_dbg(2, debug,i2c_client_s,"hexdump:");
|
|
for(i=1;i<65;i++) {
|
|
if(i!=1) {
|
|
if(((i-1)%8)==0) printk(" ");
|
|
if(((i-1)%16)==0) {
|
|
printk("\n");
|
|
v4l_dbg(2, debug,i2c_client_s,"hexdump:");
|
|
}
|
|
}
|
|
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);
|
|
if (!buf) {
|
|
v4l_err(&t->client,
|
|
"Unable to allocate memory. Detaching.\n");
|
|
return 0;
|
|
}
|
|
bt832_hexdump(i2c_client_s,buf);
|
|
|
|
if(buf[0x40] != 0x31) {
|
|
v4l_err(i2c_client_s,"This i2c chip is no bt832 (id=%02x). Detaching.\n",buf[0x40]);
|
|
kfree(buf);
|
|
return 0;
|
|
}
|
|
|
|
v4l_err(i2c_client_s,"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)))
|
|
v4l_err(i2c_client_s,"i2c i/o error VPS: rc == %d (should be 2)\n",rc);
|
|
|
|
bt832_hexdump(i2c_client_s,buf);
|
|
|
|
|
|
// Leave low power mode:
|
|
v4l_err(i2c_client_s,"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)))
|
|
v4l_err(i2c_client_s,"i2c i/o error LLPM: rc == %d (should be 2)\n",rc);
|
|
|
|
bt832_hexdump(i2c_client_s,buf);
|
|
|
|
v4l_info(i2c_client_s,"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)))
|
|
v4l_err(i2c_client_s,"i2c i/o error VPS: rc == %d (should be 2)\n",rc);
|
|
|
|
bt832_hexdump(i2c_client_s,buf);
|
|
|
|
|
|
// Enable Output
|
|
v4l_info(i2c_client_s,"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)))
|
|
v4l_err(i2c_client_s,"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)
|
|
v4l_info(i2c_client_s,"*** 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)))
|
|
v4l_info(i2c_client_s,"i2c i/o error MBAR: rc == %d (should be 2)\n",rc);
|
|
|
|
v4l_info(i2c_client_s,"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;
|
|
|
|
client_template.adapter = adap;
|
|
client_template.addr = addr;
|
|
|
|
if (NULL == (t = kzalloc(sizeof(*t), GFP_KERNEL)))
|
|
return -ENOMEM;
|
|
t->client = client_template;
|
|
i2c_set_clientdata(&t->client, t);
|
|
i2c_attach_client(&t->client);
|
|
|
|
v4l_info(&t->client,"chip found @ 0x%x\n", addr<<1);
|
|
|
|
|
|
if(! bt832_init(&t->client)) {
|
|
bt832_detach(&t->client);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bt832_probe(struct i2c_adapter *adap)
|
|
{
|
|
if (adap->class & I2C_CLASS_TV_ANALOG)
|
|
return i2c_probe(adap, &addr_data, bt832_attach);
|
|
return 0;
|
|
}
|
|
|
|
static int bt832_detach(struct i2c_client *client)
|
|
{
|
|
struct bt832 *t = i2c_get_clientdata(client);
|
|
|
|
v4l_info(&t->client,"dettach\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);
|
|
|
|
if (debug>1)
|
|
v4l_i2c_print_ioctl(&t->client,cmd);
|
|
|
|
switch (cmd) {
|
|
case BT832_HEXDUMP: {
|
|
unsigned char *buf;
|
|
buf = kmalloc(65, GFP_KERNEL);
|
|
if (!buf) {
|
|
v4l_err(&t->client,
|
|
"Unable to allocate memory\n");
|
|
break;
|
|
}
|
|
bt832_hexdump(&t->client,buf);
|
|
kfree(buf);
|
|
}
|
|
break;
|
|
case BT832_REATTACH:
|
|
v4l_info(&t->client,"re-attach\n");
|
|
i2c_del_driver(&driver);
|
|
i2c_add_driver(&driver);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
static struct i2c_driver driver = {
|
|
.driver = {
|
|
.name = "bt832",
|
|
},
|
|
.id = 0, /* FIXME */
|
|
.attach_adapter = bt832_probe,
|
|
.detach_client = bt832_detach,
|
|
.command = bt832_command,
|
|
};
|
|
static struct i2c_client client_template =
|
|
{
|
|
.name = "bt832",
|
|
.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:
|
|
*/
|