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 "id.h"
  35 #include "audiochip.h"
  36 #include "bttv.h"
  37 #include "bt832.h"
  38
  39 MODULE_LICENSE("GPL");
  40
  41 /* Addresses to scan */
  42 static unsigned short normal_i2c[] = {I2C_CLIENT_END};
  43 static unsigned short normal_i2c_range[] = {I2C_BT832_ALT1>>1,I2C_BT832_ALT2>>1,I2C_CLIENT_END};
  44 I2C_CLIENT_INSMOD;
  45
  46 /* ---------------------------------------------------------------------- */
  47
  48 #define dprintk     if (debug) printk
  49
  50 static int bt832_detach(struct i2c_client *client);
  51
  52
  53 static struct i2c_driver driver;
  54 static struct i2c_client client_template;
  55
  56 struct bt832 {
  57         struct i2c_client client;
  58 };
  59
  60 int 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                 printk("bt832: 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                 printk("bt832: 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(1) {
  76                 int i;
  77                 printk("BT832 hexdump:\n");
  78                 for(i=1;i<65;i++) {
  79                         if(i!=1) {
  80                           if(((i-1)%8)==0) printk(" ");
  81                           if(((i-1)%16)==0) printk("\n");
  82                         }
  83                         printk(" %02x",buf[i]);
  84                 }
  85                 printk("\n");
  86         }
  87         return 0;
  88 }
  89
  90 // Return: 1 (is a bt832), 0 (No bt832 here)
  91 int bt832_init(struct i2c_client *i2c_client_s)
  92 {
  93         unsigned char *buf;
  94         int rc;
  95
  96         buf=kmalloc(65,GFP_KERNEL);
  97         bt832_hexdump(i2c_client_s,buf);
  98
  99         if(buf[0x40] != 0x31) {
 100                 printk("bt832: this i2c chip is no bt832 (id=%02x). Detaching.\n",buf[0x40]);
 101                 kfree(buf);
 102                 return 0;
 103         }
 104
 105         printk("Write 0 tp VPSTATUS\n");
 106         buf[0]=BT832_VP_STATUS; // Reg.52
 107         buf[1]= 0x00;
 108         if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
 109                 printk("bt832: i2c i/o error VPS: rc == %d (should be 2)\n",rc);
 110
 111         bt832_hexdump(i2c_client_s,buf);
 112
 113
 114         // Leave low power mode:
 115         printk("Bt832: leave low power mode.\n");
 116         buf[0]=BT832_CAM_SETUP0; //0x39 57
 117         buf[1]=0x08;
 118         if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
 119                 printk("bt832: i2c i/o error LLPM: rc == %d (should be 2)\n",rc);
 120
 121         bt832_hexdump(i2c_client_s,buf);
 122
 123         printk("Write 0 tp VPSTATUS\n");
 124         buf[0]=BT832_VP_STATUS; // Reg.52
 125         buf[1]= 0x00;
 126         if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
 127                 printk("bt832: i2c i/o error VPS: rc == %d (should be 2)\n",rc);
 128
 129         bt832_hexdump(i2c_client_s,buf);
 130
 131
 132         // Enable Output
 133         printk("Enable Output\n");
 134         buf[0]=BT832_VP_CONTROL1; // Reg.40
 135         buf[1]= 0x27 & (~0x01); // Default | !skip
 136         if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
 137                 printk("bt832: i2c i/o error EO: rc == %d (should be 2)\n",rc);
 138
 139         bt832_hexdump(i2c_client_s,buf);
 140
 141 #if 0
 142         // Full 30/25 Frame rate
 143         printk("Full 30/25 Frame rate\n");
 144         buf[0]=BT832_VP_CONTROL0; // Reg.39
 145         buf[1]= 0x00;
 146         if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
 147                 printk("bt832: i2c i/o error FFR: rc == %d (should be 2)\n",rc);
 148
 149         bt832_hexdump(i2c_client_s,buf);
 150 #endif
 151
 152 #if 1
 153         // for testing (even works when no camera attached)
 154         printk("bt832: *** Generate NTSC M Bars *****\n");
 155         buf[0]=BT832_VP_TESTCONTROL0; // Reg. 42
 156         buf[1]=3; // Generate NTSC System M bars, Generate Frame timing internally
 157         if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
 158                 printk("bt832: i2c i/o error MBAR: rc == %d (should be 2)\n",rc);
 159 #endif
 160
 161         printk("Bt832: Camera Present: %s\n",
 162                 (buf[1+BT832_CAM_STATUS] & BT832_56_CAMERA_PRESENT) ? "yes":"no");
 163
 164         bt832_hexdump(i2c_client_s,buf);
 165         kfree(buf);
 166         return 1;
 167 }
 168
 169
 170
 171 static int bt832_attach(struct i2c_adapter *adap, int addr,
 172                           unsigned short flags, int kind)
 173 {
 174         struct bt832 *t;
 175
 176         printk("bt832_attach\n");
 177
 178         client_template.adapter = adap;
 179         client_template.addr    = addr;
 180
 181         printk("bt832: chip found @ 0x%x\n", addr<<1);
 182
 183         if (NULL == (t = kmalloc(sizeof(*t), GFP_KERNEL)))
 184                 return -ENOMEM;
 185         memset(t,0,sizeof(*t));
 186         t->client = client_template;
 187         t->client.data = t;
 188         i2c_attach_client(&t->client);
 189
 190         if(! bt832_init(&t->client)) {
 191                 bt832_detach(&t->client);
 192                 return -1;
 193         }
 194
 195         return 0;
 196 }
 197
 198 static int bt832_probe(struct i2c_adapter *adap)
 199 {
 200         if (adap->class & I2C_CLASS_TV_ANALOG)
 201                 return i2c_probe(adap, &addr_data, bt832_attach);
 202         return 0;
 203 }
 204
 205 static int bt832_detach(struct i2c_client *client)
 206 {
 207         struct bt832 *t = (struct bt832*)client->data;
 208
 209         printk("bt832: detach.\n");
 210         i2c_detach_client(client);
 211         kfree(t);
 212         return 0;
 213 }
 214
 215 static int
 216 bt832_command(struct i2c_client *client, unsigned int cmd, void *arg)
 217 {
 218         struct bt832 *t = (struct bt832*)client->data;
 219
 220         printk("bt832: command %x\n",cmd);
 221
 222         switch (cmd) {
 223                 case BT832_HEXDUMP: {
 224                         unsigned char *buf;
 225                         buf=kmalloc(65,GFP_KERNEL);
 226                         bt832_hexdump(&t->client,buf);
 227                         kfree(buf);
 228                 }
 229                 break;
 230                 case BT832_REATTACH:
 231                         printk("bt832: re-attach\n");
 232                         i2c_del_driver(&driver);
 233                         i2c_add_driver(&driver);
 234                 break;
 235         }
 236         return 0;
 237 }
 238
 239 /* ----------------------------------------------------------------------- */
 240
 241 static struct i2c_driver driver = {
 242         .owner          = THIS_MODULE,
 243         .name           = "i2c bt832 driver",
 244         .id             = -1, /* FIXME */
 245         .flags          = I2C_DF_NOTIFY,
 246         .attach_adapter = bt832_probe,
 247         .detach_client  = bt832_detach,
 248         .command        = bt832_command,
 249 };
 250 static struct i2c_client client_template =
 251 {
 252         .name   = "bt832",
 253         .flags  = I2C_CLIENT_ALLOW_USE,
 254         .driver = &driver,
 255 };
 256
 257
 258 int bt832_init_module(void)
 259 {
 260         i2c_add_driver(&driver);
 261         return 0;
 262 }
 263
 264 static void bt832_cleanup_module(void)
 265 {
 266         i2c_del_driver(&driver);
 267 }
 268
 269 module_init(bt832_init_module);
 270 module_exit(bt832_cleanup_module);
 271