drivers/media/video/bt832.c

   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
  34 #include <media/audiochip.h>
  35 #include "bttv.h"
  36 #include "bt832.h"
  37
  38 MODULE_LICENSE("GPL");
  39
  40 /* Addresses to scan */
  41 static unsigned short normal_i2c[] = { I2C_BT832_ALT1>>1, I2C_BT832_ALT2>>1,
  42                                        I2C_CLIENT_END };
  43 I2C_CLIENT_INSMOD;
  44
  45 /* ---------------------------------------------------------------------- */
  46
  47 #define dprintk     if (debug) printk
  48
  49 static int bt832_detach(struct i2c_client *client);
  50
  51
  52 static struct i2c_driver driver;
  53 static struct i2c_client client_template;
  54
  55 struct bt832 {
  56         struct i2c_client client;
  57 };
  58
  59 int bt832_hexdump(struct i2c_client *i2c_client_s, unsigned char *buf)
  60 {
  61         int i,rc;
  62         buf[0]=0x80; // start at register 0 with auto-increment
  63         if (1 != (rc = i2c_master_send(i2c_client_s,buf,1)))
  64                 printk("bt832: i2c i/o error: rc == %d (should be 1)\n",rc);
  65
  66         for(i=0;i<65;i++)
  67                 buf[i]=0;
  68         if (65 != (rc=i2c_master_recv(i2c_client_s,buf,65)))
  69                 printk("bt832: i2c i/o error: rc == %d (should be 65)\n",rc);
  70
  71         // Note: On READ the first byte is the current index
  72         //  (e.g. 0x80, what we just wrote)
  73
  74         if(1) {
  75                 int i;
  76                 printk("BT832 hexdump:\n");
  77                 for(i=1;i<65;i++) {
  78                         if(i!=1) {
  79                           if(((i-1)%8)==0) printk(" ");
  80                           if(((i-1)%16)==0) printk("\n");
  81                         }
  82                         printk(" %02x",buf[i]);
  83                 }
  84                 printk("\n");
  85         }
  86         return 0;
  87 }
  88
  89 // Return: 1 (is a bt832), 0 (No bt832 here)
  90 int bt832_init(struct i2c_client *i2c_client_s)
  91 {
  92         unsigned char *buf;
  93         int rc;
  94
  95         buf=kmalloc(65,GFP_KERNEL);
  96         bt832_hexdump(i2c_client_s,buf);
  97
  98         if(buf[0x40] != 0x31) {
  99                 printk("bt832: this i2c chip is no bt832 (id=%02x). Detaching.\n",buf[0x40]);
 100                 kfree(buf);
 101                 return 0;
 102         }
 103
 104         printk("Write 0 tp VPSTATUS\n");
 105         buf[0]=BT832_VP_STATUS; // Reg.52
 106         buf[1]= 0x00;
 107         if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
 108                 printk("bt832: i2c i/o error VPS: rc == %d (should be 2)\n",rc);
 109
 110         bt832_hexdump(i2c_client_s,buf);
 111
 112
 113         // Leave low power mode:
 114         printk("Bt832: leave low power mode.\n");
 115         buf[0]=BT832_CAM_SETUP0; //0x39 57
 116         buf[1]=0x08;
 117         if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
 118                 printk("bt832: i2c i/o error LLPM: rc == %d (should be 2)\n",rc);
 119
 120         bt832_hexdump(i2c_client_s,buf);
 121
 122         printk("Write 0 tp VPSTATUS\n");
 123         buf[0]=BT832_VP_STATUS; // Reg.52
 124         buf[1]= 0x00;
 125         if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
 126                 printk("bt832: i2c i/o error VPS: rc == %d (should be 2)\n",rc);
 127
 128         bt832_hexdump(i2c_client_s,buf);
 129
 130
 131         // Enable Output
 132         printk("Enable Output\n");
 133         buf[0]=BT832_VP_CONTROL1; // Reg.40
 134         buf[1]= 0x27 & (~0x01); // Default | !skip
 135         if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
 136                 printk("bt832: i2c i/o error EO: rc == %d (should be 2)\n",rc);
 137
 138         bt832_hexdump(i2c_client_s,buf);
 139
 140
 141         // for testing (even works when no camera attached)
 142         printk("bt832: *** Generate NTSC M Bars *****\n");
 143         buf[0]=BT832_VP_TESTCONTROL0; // Reg. 42
 144         buf[1]=3; // Generate NTSC System M bars, Generate Frame timing internally
 145         if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
 146                 printk("bt832: i2c i/o error MBAR: rc == %d (should be 2)\n",rc);
 147
 148         printk("Bt832: Camera Present: %s\n",
 149                 (buf[1+BT832_CAM_STATUS] & BT832_56_CAMERA_PRESENT) ? "yes":"no");
 150
 151         bt832_hexdump(i2c_client_s,buf);
 152         kfree(buf);
 153         return 1;
 154 }
 155
 156
 157
 158 static int bt832_attach(struct i2c_adapter *adap, int addr, int kind)
 159 {
 160         struct bt832 *t;
 161
 162         printk("bt832_attach\n");
 163
 164         client_template.adapter = adap;
 165         client_template.addr    = addr;
 166
 167         printk("bt832: chip found @ 0x%x\n", addr<<1);
 168
 169         if (NULL == (t = kmalloc(sizeof(*t), GFP_KERNEL)))
 170                 return -ENOMEM;
 171         memset(t,0,sizeof(*t));
 172         t->client = client_template;
 173         i2c_set_clientdata(&t->client, t);
 174         i2c_attach_client(&t->client);
 175
 176         if(! bt832_init(&t->client)) {
 177                 bt832_detach(&t->client);
 178                 return -1;
 179         }
 180
 181         return 0;
 182 }
 183
 184 static int bt832_probe(struct i2c_adapter *adap)
 185 {
 186 #ifdef I2C_CLASS_TV_ANALOG
 187         if (adap->class & I2C_CLASS_TV_ANALOG)
 188                 return i2c_probe(adap, &addr_data, bt832_attach);
 189 #else
 190         if (adap->id == I2C_HW_B_BT848)
 191                 return i2c_probe(adap, &addr_data, bt832_attach);
 192 #endif
 193         return 0;
 194 }
 195
 196 static int bt832_detach(struct i2c_client *client)
 197 {
 198         struct bt832 *t = i2c_get_clientdata(client);
 199
 200         printk("bt832: detach.\n");
 201         i2c_detach_client(client);
 202         kfree(t);
 203         return 0;
 204 }
 205
 206 static int
 207 bt832_command(struct i2c_client *client, unsigned int cmd, void *arg)
 208 {
 209         struct bt832 *t = i2c_get_clientdata(client);
 210
 211         printk("bt832: command %x\n",cmd);
 212
 213         switch (cmd) {
 214                 case BT832_HEXDUMP: {
 215                         unsigned char *buf;
 216                         buf=kmalloc(65,GFP_KERNEL);
 217                         bt832_hexdump(&t->client,buf);
 218                         kfree(buf);
 219                 }
 220                 break;
 221                 case BT832_REATTACH:
 222                         printk("bt832: re-attach\n");
 223                         i2c_del_driver(&driver);
 224                         i2c_add_driver(&driver);
 225                 break;
 226         }
 227         return 0;
 228 }
 229
 230 /* ----------------------------------------------------------------------- */
 231
 232 static struct i2c_driver driver = {
 233         .owner          = THIS_MODULE,
 234         .name           = "i2c bt832 driver",
 235         .id             = -1, /* FIXME */
 236         .attach_adapter = bt832_probe,
 237         .detach_client  = bt832_detach,
 238         .command        = bt832_command,
 239 };
 240 static struct i2c_client client_template =
 241 {
 242         .name       = "bt832",
 243         .flags      = I2C_CLIENT_ALLOW_USE,
 244         .driver     = &driver,
 245 };
 246
 247
 248 static int __init bt832_init_module(void)
 249 {
 250         return i2c_add_driver(&driver);
 251 }
 252
 253 static void __exit bt832_cleanup_module(void)
 254 {
 255         i2c_del_driver(&driver);
 256 }
 257
 258 module_init(bt832_init_module);
 259 module_exit(bt832_cleanup_module);
 260
 261 /*
 262  * Overrides for Emacs so that we follow Linus's tabbing style.
 263  * ---------------------------------------------------------------------------
 264  * Local variables:
 265  * c-basic-offset: 8
 266  * End:
 267  */