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 #include <media/audiochip.h>
  34 #include <media/v4l2-common.h>
  35
  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_BT832_ALT1>>1, I2C_BT832_ALT2>>1,
  43                                        I2C_CLIENT_END };
  44 I2C_CLIENT_INSMOD;
  45
  46 int debug    = 0;    /* debug output */
  47 module_param(debug,            int, 0644);
  48
  49 /* ---------------------------------------------------------------------- */
  50
  51 static int bt832_detach(struct i2c_client *client);
  52
  53
  54 static struct i2c_driver driver;
  55 static struct i2c_client client_template;
  56
  57 struct bt832 {
  58         struct i2c_client client;
  59 };
  60
  61 int bt832_hexdump(struct i2c_client *i2c_client_s, unsigned char *buf)
  62 {
  63         int i,rc;
  64         buf[0]=0x80; // start at register 0 with auto-increment
  65         if (1 != (rc = i2c_master_send(i2c_client_s,buf,1)))
  66                 v4l_err(i2c_client_s,"i2c i/o error: rc == %d (should be 1)\n",rc);
  67
  68         for(i=0;i<65;i++)
  69                 buf[i]=0;
  70         if (65 != (rc=i2c_master_recv(i2c_client_s,buf,65)))
  71                 v4l_err(i2c_client_s,"i2c i/o error: rc == %d (should be 65)\n",rc);
  72
  73         // Note: On READ the first byte is the current index
  74         //  (e.g. 0x80, what we just wrote)
  75
  76         if(debug>1) {
  77                 int i;
  78                 v4l_dbg(2, debug,i2c_client_s,"hexdump:");
  79                 for(i=1;i<65;i++) {
  80                         if(i!=1) {
  81                                 if(((i-1)%8)==0) printk(" ");
  82                                 if(((i-1)%16)==0) {
  83                                         printk("\n");
  84                                         v4l_dbg(2, debug,i2c_client_s,"hexdump:");
  85                                 }
  86                         }
  87                         printk(" %02x",buf[i]);
  88                 }
  89                 printk("\n");
  90         }
  91         return 0;
  92 }
  93
  94 // Return: 1 (is a bt832), 0 (No bt832 here)
  95 int bt832_init(struct i2c_client *i2c_client_s)
  96 {
  97         unsigned char *buf;
  98         int rc;
  99
 100         buf=kmalloc(65,GFP_KERNEL);
 101         bt832_hexdump(i2c_client_s,buf);
 102
 103         if(buf[0x40] != 0x31) {
 104                 v4l_err(i2c_client_s,"This i2c chip is no bt832 (id=%02x). Detaching.\n",buf[0x40]);
 105                 kfree(buf);
 106                 return 0;
 107         }
 108
 109         v4l_err(i2c_client_s,"Write 0 tp VPSTATUS\n");
 110         buf[0]=BT832_VP_STATUS; // Reg.52
 111         buf[1]= 0x00;
 112         if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
 113                 v4l_err(i2c_client_s,"i2c i/o error VPS: rc == %d (should be 2)\n",rc);
 114
 115         bt832_hexdump(i2c_client_s,buf);
 116
 117
 118         // Leave low power mode:
 119         v4l_err(i2c_client_s,"leave low power mode.\n");
 120         buf[0]=BT832_CAM_SETUP0; //0x39 57
 121         buf[1]=0x08;
 122         if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
 123                 v4l_err(i2c_client_s,"i2c i/o error LLPM: rc == %d (should be 2)\n",rc);
 124
 125         bt832_hexdump(i2c_client_s,buf);
 126
 127         v4l_info(i2c_client_s,"Write 0 tp VPSTATUS\n");
 128         buf[0]=BT832_VP_STATUS; // Reg.52
 129         buf[1]= 0x00;
 130         if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
 131                 v4l_err(i2c_client_s,"i2c i/o error VPS: rc == %d (should be 2)\n",rc);
 132
 133         bt832_hexdump(i2c_client_s,buf);
 134
 135
 136         // Enable Output
 137         v4l_info(i2c_client_s,"Enable Output\n");
 138         buf[0]=BT832_VP_CONTROL1; // Reg.40
 139         buf[1]= 0x27 & (~0x01); // Default | !skip
 140         if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
 141                 v4l_err(i2c_client_s,"i2c i/o error EO: rc == %d (should be 2)\n",rc);
 142
 143         bt832_hexdump(i2c_client_s,buf);
 144
 145
 146         // for testing (even works when no camera attached)
 147         v4l_info(i2c_client_s,"*** Generate NTSC M Bars *****\n");
 148         buf[0]=BT832_VP_TESTCONTROL0; // Reg. 42
 149         buf[1]=3; // Generate NTSC System M bars, Generate Frame timing internally
 150         if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
 151                 v4l_info(i2c_client_s,"i2c i/o error MBAR: rc == %d (should be 2)\n",rc);
 152
 153         v4l_info(i2c_client_s,"Camera Present: %s\n",
 154                 (buf[1+BT832_CAM_STATUS] & BT832_56_CAMERA_PRESENT) ? "yes":"no");
 155
 156         bt832_hexdump(i2c_client_s,buf);
 157         kfree(buf);
 158         return 1;
 159 }
 160
 161
 162
 163 static int bt832_attach(struct i2c_adapter *adap, int addr, int kind)
 164 {
 165         struct bt832 *t;
 166
 167         client_template.adapter = adap;
 168         client_template.addr    = addr;
 169
 170         if (NULL == (t = kzalloc(sizeof(*t), GFP_KERNEL)))
 171                 return -ENOMEM;
 172         t->client = client_template;
 173         i2c_set_clientdata(&t->client, t);
 174         i2c_attach_client(&t->client);
 175
 176         v4l_info(&t->client,"chip found @ 0x%x\n", addr<<1);
 177
 178
 179         if(! bt832_init(&t->client)) {
 180                 bt832_detach(&t->client);
 181                 return -1;
 182         }
 183
 184         return 0;
 185 }
 186
 187 static int bt832_probe(struct i2c_adapter *adap)
 188 {
 189         if (adap->class & I2C_CLASS_TV_ANALOG)
 190                 return i2c_probe(adap, &addr_data, bt832_attach);
 191         return 0;
 192 }
 193
 194 static int bt832_detach(struct i2c_client *client)
 195 {
 196         struct bt832 *t = i2c_get_clientdata(client);
 197
 198         v4l_info(&t->client,"dettach\n");
 199         i2c_detach_client(client);
 200         kfree(t);
 201         return 0;
 202 }
 203
 204 static int
 205 bt832_command(struct i2c_client *client, unsigned int cmd, void *arg)
 206 {
 207         struct bt832 *t = i2c_get_clientdata(client);
 208
 209         if (debug>1)
 210                 v4l_i2c_print_ioctl(&t->client,cmd);
 211
 212         switch (cmd) {
 213                 case BT832_HEXDUMP: {
 214                         unsigned char *buf;
 215                         buf=kmalloc(65,GFP_KERNEL);
 216                         bt832_hexdump(&t->client,buf);
 217                         kfree(buf);
 218                 }
 219                 break;
 220                 case BT832_REATTACH:
 221                         v4l_info(&t->client,"re-attach\n");
 222                         i2c_del_driver(&driver);
 223                         i2c_add_driver(&driver);
 224                 break;
 225         }
 226         return 0;
 227 }
 228
 229 /* ----------------------------------------------------------------------- */
 230
 231 static struct i2c_driver driver = {
 232         .driver = {
 233                 .name   = "bt832",
 234         },
 235         .id             = 0, /* 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         .driver     = &driver,
 244 };
 245
 246
 247 static int __init bt832_init_module(void)
 248 {
 249         return i2c_add_driver(&driver);
 250 }
 251
 252 static void __exit bt832_cleanup_module(void)
 253 {
 254         i2c_del_driver(&driver);
 255 }
 256
 257 module_init(bt832_init_module);
 258 module_exit(bt832_cleanup_module);
 259
 260 /*
 261  * Overrides for Emacs so that we follow Linus's tabbing style.
 262  * ---------------------------------------------------------------------------
 263  * Local variables:
 264  * c-basic-offset: 8
 265  * End:
 266  */