drivers/media/video/bt8xx/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/v4l2-common.h>
  34
  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_ADDR_BT832_ALT1>>1, I2C_ADDR_BT832_ALT2>>1,
  42                                        I2C_CLIENT_END };
  43 I2C_CLIENT_INSMOD;
  44
  45 int debug;    /* debug output */
  46 module_param(debug,            int, 0644);
  47
  48 /* ---------------------------------------------------------------------- */
  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                 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)
  94 int 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
 162 static 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
 186 static 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
 193 static 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
 203 static int
 204 bt832_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
 230 static struct i2c_driver driver = {
 231         .driver = {
 232                 .name   = "bt832",
 233         },
 234         .id             = 0, /* FIXME */
 235         .attach_adapter = bt832_probe,
 236         .detach_client  = bt832_detach,
 237         .command        = bt832_command,
 238 };
 239 static struct i2c_client client_template =
 240 {
 241         .name       = "bt832",
 242         .driver     = &driver,
 243 };
 244
 245
 246 static int __init bt832_init_module(void)
 247 {
 248         return i2c_add_driver(&driver);
 249 }
 250
 251 static void __exit bt832_cleanup_module(void)
 252 {
 253         i2c_del_driver(&driver);
 254 }
 255
 256 module_init(bt832_init_module);
 257 module_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  */