/* 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 #include #include #include #include #include #include #include #include #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); 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); 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: */