1/* Driver for Bt832 CMOS Camera Video Processor 2 i2c-addresses: 0x88 or 0x8a 3 4 The BT832 interfaces to a Quartzsight Digital Camera (352x288, 25 or 30 fps) 5 via a 9 pin connector ( 4-wire SDATA, 2-wire i2c, SCLK, VCC, GND). 6 It outputs an 8-bit 4:2:2 YUV or YCrCb video signal which can be directly 7 connected to bt848/bt878 GPIO pins on this purpose. 8 (see: VLSI Vision Ltd. www.vvl.co.uk for camera datasheets) 9 10 Supported Cards: 11 - Pixelview Rev.4E: 0x8a 12 GPIO 0x400000 toggles Bt832 RESET, and the chip changes to i2c 0x88 ! 13 14 (c) Gunther Mayer, 2002 15 16 STATUS: 17 - detect chip and hexdump 18 - reset chip and leave low power mode 19 - detect camera present 20 21 TODO: 22 - make it work (find correct setup for Bt832 and Bt878) 23*/ 24 25#include <linux/module.h> 26#include <linux/kernel.h> 27#include <linux/i2c.h> 28#include <linux/types.h> 29#include <linux/videodev.h> 30#include <linux/init.h> 31#include <linux/errno.h> 32#include <linux/slab.h> 33#include <media/v4l2-common.h> 34 35#include "bttv.h" 36#include "bt832.h" 37 38MODULE_LICENSE("GPL"); 39 40/* Addresses to scan */ 41static unsigned short normal_i2c[] = { I2C_ADDR_BT832_ALT1>>1, I2C_ADDR_BT832_ALT2>>1, 42 I2C_CLIENT_END }; 43I2C_CLIENT_INSMOD; 44 45int debug; /* debug output */ 46module_param(debug, int, 0644); 47 48/* ---------------------------------------------------------------------- */ 49 50static int bt832_detach(struct i2c_client *client); 51 52 53static struct i2c_driver driver; 54static struct i2c_client client_template; 55 56struct bt832 { 57 struct i2c_client client; 58}; 59 60int bt832_hexdump(struct i2c_client *i2c_client_s, unsigned char *buf) 61{ 62 int i,rc; 63 buf[0]=0x80; // start at register 0 with auto-increment 64 if (1 != (rc = i2c_master_send(i2c_client_s,buf,1))) 65 v4l_err(i2c_client_s,"i2c i/o error: rc == %d (should be 1)\n",rc); 66 67 for(i=0;i<65;i++) 68 buf[i]=0; 69 if (65 != (rc=i2c_master_recv(i2c_client_s,buf,65))) 70 v4l_err(i2c_client_s,"i2c i/o error: rc == %d (should be 65)\n",rc); 71 72 // Note: On READ the first byte is the current index 73 // (e.g. 0x80, what we just wrote) 74 75 if(debug>1) { 76 int i; 77 v4l_dbg(2, debug,i2c_client_s,"hexdump:"); 78 for(i=1;i<65;i++) { 79 if(i!=1) { 80 if(((i-1)%8)==0) printk(" "); 81 if(((i-1)%16)==0) { 82 printk("\n"); 83 v4l_dbg(2, debug,i2c_client_s,"hexdump:"); 84 } 85 } 86 printk(" %02x",buf[i]); 87 } 88 printk("\n"); 89 } 90 return 0; 91} 92 93// Return: 1 (is a bt832), 0 (No bt832 here) 94int bt832_init(struct i2c_client *i2c_client_s) 95{ 96 unsigned char *buf; 97 int rc; 98 99 buf=kmalloc(65,GFP_KERNEL); 100 bt832_hexdump(i2c_client_s,buf); 101 102 if(buf[0x40] != 0x31) { 103 v4l_err(i2c_client_s,"This i2c chip is no bt832 (id=%02x). Detaching.\n",buf[0x40]); 104 kfree(buf); 105 return 0; 106 } 107 108 v4l_err(i2c_client_s,"Write 0 tp VPSTATUS\n"); 109 buf[0]=BT832_VP_STATUS; // Reg.52 110 buf[1]= 0x00; 111 if (2 != (rc = i2c_master_send(i2c_client_s,buf,2))) 112 v4l_err(i2c_client_s,"i2c i/o error VPS: rc == %d (should be 2)\n",rc); 113 114 bt832_hexdump(i2c_client_s,buf); 115 116 117 // Leave low power mode: 118 v4l_err(i2c_client_s,"leave low power mode.\n"); 119 buf[0]=BT832_CAM_SETUP0; //0x39 57 120 buf[1]=0x08; 121 if (2 != (rc = i2c_master_send(i2c_client_s,buf,2))) 122 v4l_err(i2c_client_s,"i2c i/o error LLPM: rc == %d (should be 2)\n",rc); 123 124 bt832_hexdump(i2c_client_s,buf); 125 126 v4l_info(i2c_client_s,"Write 0 tp VPSTATUS\n"); 127 buf[0]=BT832_VP_STATUS; // Reg.52 128 buf[1]= 0x00; 129 if (2 != (rc = i2c_master_send(i2c_client_s,buf,2))) 130 v4l_err(i2c_client_s,"i2c i/o error VPS: rc == %d (should be 2)\n",rc); 131 132 bt832_hexdump(i2c_client_s,buf); 133 134 135 // Enable Output 136 v4l_info(i2c_client_s,"Enable Output\n"); 137 buf[0]=BT832_VP_CONTROL1; // Reg.40 138 buf[1]= 0x27 & (~0x01); // Default | !skip 139 if (2 != (rc = i2c_master_send(i2c_client_s,buf,2))) 140 v4l_err(i2c_client_s,"i2c i/o error EO: rc == %d (should be 2)\n",rc); 141 142 bt832_hexdump(i2c_client_s,buf); 143 144 145 // for testing (even works when no camera attached) 146 v4l_info(i2c_client_s,"*** Generate NTSC M Bars *****\n"); 147 buf[0]=BT832_VP_TESTCONTROL0; // Reg. 42 148 buf[1]=3; // Generate NTSC System M bars, Generate Frame timing internally 149 if (2 != (rc = i2c_master_send(i2c_client_s,buf,2))) 150 v4l_info(i2c_client_s,"i2c i/o error MBAR: rc == %d (should be 2)\n",rc); 151 152 v4l_info(i2c_client_s,"Camera Present: %s\n", 153 (buf[1+BT832_CAM_STATUS] & BT832_56_CAMERA_PRESENT) ? "yes":"no"); 154 155 bt832_hexdump(i2c_client_s,buf); 156 kfree(buf); 157 return 1; 158} 159 160 161 162static int bt832_attach(struct i2c_adapter *adap, int addr, int kind) 163{ 164 struct bt832 *t; 165 166 client_template.adapter = adap; 167 client_template.addr = addr; 168 169 if (NULL == (t = kzalloc(sizeof(*t), GFP_KERNEL))) 170 return -ENOMEM; 171 t->client = client_template; 172 i2c_set_clientdata(&t->client, t); 173 i2c_attach_client(&t->client); 174 175 v4l_info(&t->client,"chip found @ 0x%x\n", addr<<1); 176 177 178 if(! bt832_init(&t->client)) { 179 bt832_detach(&t->client); 180 return -1; 181 } 182 183 return 0; 184} 185 186static int bt832_probe(struct i2c_adapter *adap) 187{ 188 if (adap->class & I2C_CLASS_TV_ANALOG) 189 return i2c_probe(adap, &addr_data, bt832_attach); 190 return 0; 191} 192 193static int bt832_detach(struct i2c_client *client) 194{ 195 struct bt832 *t = i2c_get_clientdata(client); 196 197 v4l_info(&t->client,"dettach\n"); 198 i2c_detach_client(client); 199 kfree(t); 200 return 0; 201} 202 203static int 204bt832_command(struct i2c_client *client, unsigned int cmd, void *arg) 205{ 206 struct bt832 *t = i2c_get_clientdata(client); 207 208 if (debug>1) 209 v4l_i2c_print_ioctl(&t->client,cmd); 210 211 switch (cmd) { 212 case BT832_HEXDUMP: { 213 unsigned char *buf; 214 buf=kmalloc(65,GFP_KERNEL); 215 bt832_hexdump(&t->client,buf); 216 kfree(buf); 217 } 218 break; 219 case BT832_REATTACH: 220 v4l_info(&t->client,"re-attach\n"); 221 i2c_del_driver(&driver); 222 i2c_add_driver(&driver); 223 break; 224 } 225 return 0; 226} 227 228/* ----------------------------------------------------------------------- */ 229 230static struct i2c_driver driver = { 231 .driver = { 232 .name = "bt832", 233 }, 234 .id = 0, 235 .attach_adapter = bt832_probe, 236 .detach_client = bt832_detach, 237 .command = bt832_command, 238}; 239static struct i2c_client client_template = 240{ 241 .name = "bt832", 242 .driver = &driver, 243}; 244 245 246static int __init bt832_init_module(void) 247{ 248 return i2c_add_driver(&driver); 249} 250 251static void __exit bt832_cleanup_module(void) 252{ 253 i2c_del_driver(&driver); 254} 255 256module_init(bt832_init_module); 257module_exit(bt832_cleanup_module); 258 259/* 260 * Overrides for Emacs so that we follow Linus's tabbing style. 261 * --------------------------------------------------------------------------- 262 * Local variables: 263 * c-basic-offset: 8 264 * End: 265 */ 266