drivers/media/video/bt856.c

   1 /*
   2  * bt856 - BT856A Digital Video Encoder (Rockwell Part)
   3  *
   4  * Copyright (C) 1999 Mike Bernson <mike@mlb.org>
   5  * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
   6  *
   7  * Modifications for LML33/DC10plus unified driver
   8  * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
   9  *
  10  * This code was modify/ported from the saa7111 driver written
  11  * by Dave Perks.
  12  *
  13  * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
  14  *   - moved over to linux>=2.4.x i2c protocol (9/9/2002)
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  29  */
  30
  31 #include <linux/module.h>
  32 #include <linux/init.h>
  33 #include <linux/delay.h>
  34 #include <linux/errno.h>
  35 #include <linux/fs.h>
  36 #include <linux/kernel.h>
  37 #include <linux/major.h>
  38 #include <linux/slab.h>
  39 #include <linux/mm.h>
  40 #include <linux/pci.h>
  41 #include <linux/signal.h>
  42 #include <asm/io.h>
  43 #include <asm/pgtable.h>
  44 #include <asm/page.h>
  45 #include <linux/types.h>
  46
  47 #include <linux/videodev.h>
  48 #include <asm/uaccess.h>
  49
  50 MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
  51 MODULE_AUTHOR("Mike Bernson & Dave Perks");
  52 MODULE_LICENSE("GPL");
  53
  54 #include <linux/i2c.h>
  55
  56 #define I2C_NAME(s) (s)->name
  57
  58 #include <linux/video_encoder.h>
  59
  60 static int debug = 0;
  61 module_param(debug, int, 0);
  62 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  63
  64 #define dprintk(num, format, args...) \
  65         do { \
  66                 if (debug >= num) \
  67                         printk(format, ##args); \
  68         } while (0)
  69
  70 /* ----------------------------------------------------------------------- */
  71
  72 #define REG_OFFSET      0xDA
  73 #define BT856_NR_REG    6
  74
  75 struct bt856 {
  76         unsigned char reg[BT856_NR_REG];
  77
  78         int norm;
  79         int enable;
  80 };
  81
  82 #define   I2C_BT856        0x88
  83
  84 /* ----------------------------------------------------------------------- */
  85
  86 static inline int
  87 bt856_write (struct i2c_client *client,
  88              u8                 reg,
  89              u8                 value)
  90 {
  91         struct bt856 *encoder = i2c_get_clientdata(client);
  92
  93         encoder->reg[reg - REG_OFFSET] = value;
  94         return i2c_smbus_write_byte_data(client, reg, value);
  95 }
  96
  97 static inline int
  98 bt856_setbit (struct i2c_client *client,
  99               u8                 reg,
 100               u8                 bit,
 101               u8                 value)
 102 {
 103         struct bt856 *encoder = i2c_get_clientdata(client);
 104
 105         return bt856_write(client, reg,
 106                            (encoder->
 107                             reg[reg - REG_OFFSET] & ~(1 << bit)) |
 108                             (value ? (1 << bit) : 0));
 109 }
 110
 111 static void
 112 bt856_dump (struct i2c_client *client)
 113 {
 114         int i;
 115         struct bt856 *encoder = i2c_get_clientdata(client);
 116
 117         printk(KERN_INFO "%s: register dump:", I2C_NAME(client));
 118         for (i = 0; i < BT856_NR_REG; i += 2)
 119                 printk(" %02x", encoder->reg[i]);
 120         printk("\n");
 121 }
 122
 123 /* ----------------------------------------------------------------------- */
 124
 125 static int
 126 bt856_command (struct i2c_client *client,
 127                unsigned int       cmd,
 128                void              *arg)
 129 {
 130         struct bt856 *encoder = i2c_get_clientdata(client);
 131
 132         switch (cmd) {
 133
 134         case 0:
 135                 /* This is just for testing!!! */
 136                 dprintk(1, KERN_INFO "bt856: init\n");
 137                 bt856_write(client, 0xdc, 0x18);
 138                 bt856_write(client, 0xda, 0);
 139                 bt856_write(client, 0xde, 0);
 140
 141                 bt856_setbit(client, 0xdc, 3, 1);
 142                 //bt856_setbit(client, 0xdc, 6, 0);
 143                 bt856_setbit(client, 0xdc, 4, 1);
 144
 145                 switch (encoder->norm) {
 146
 147                 case VIDEO_MODE_NTSC:
 148                         bt856_setbit(client, 0xdc, 2, 0);
 149                         break;
 150
 151                 case VIDEO_MODE_PAL:
 152                         bt856_setbit(client, 0xdc, 2, 1);
 153                         break;
 154                 }
 155
 156                 bt856_setbit(client, 0xdc, 1, 1);
 157                 bt856_setbit(client, 0xde, 4, 0);
 158                 bt856_setbit(client, 0xde, 3, 1);
 159                 if (debug != 0)
 160                         bt856_dump(client);
 161                 break;
 162
 163         case ENCODER_GET_CAPABILITIES:
 164         {
 165                 struct video_encoder_capability *cap = arg;
 166
 167                 dprintk(1, KERN_INFO "%s: get capabilities\n",
 168                         I2C_NAME(client));
 169
 170                 cap->flags = VIDEO_ENCODER_PAL |
 171                              VIDEO_ENCODER_NTSC |
 172                              VIDEO_ENCODER_CCIR;
 173                 cap->inputs = 2;
 174                 cap->outputs = 1;
 175         }
 176                 break;
 177
 178         case ENCODER_SET_NORM:
 179         {
 180                 int *iarg = arg;
 181
 182                 dprintk(1, KERN_INFO "%s: set norm %d\n", I2C_NAME(client),
 183                         *iarg);
 184
 185                 switch (*iarg) {
 186
 187                 case VIDEO_MODE_NTSC:
 188                         bt856_setbit(client, 0xdc, 2, 0);
 189                         break;
 190
 191                 case VIDEO_MODE_PAL:
 192                         bt856_setbit(client, 0xdc, 2, 1);
 193                         bt856_setbit(client, 0xda, 0, 0);
 194                         //bt856_setbit(client, 0xda, 0, 1);
 195                         break;
 196
 197                 default:
 198                         return -EINVAL;
 199
 200                 }
 201                 encoder->norm = *iarg;
 202                 if (debug != 0)
 203                         bt856_dump(client);
 204         }
 205                 break;
 206
 207         case ENCODER_SET_INPUT:
 208         {
 209                 int *iarg = arg;
 210
 211                 dprintk(1, KERN_INFO "%s: set input %d\n", I2C_NAME(client),
 212                         *iarg);
 213
 214                 /* We only have video bus.
 215                  * iarg = 0: input is from bt819
 216                  * iarg = 1: input is from ZR36060 */
 217
 218                 switch (*iarg) {
 219
 220                 case 0:
 221                         bt856_setbit(client, 0xde, 4, 0);
 222                         bt856_setbit(client, 0xde, 3, 1);
 223                         bt856_setbit(client, 0xdc, 3, 1);
 224                         bt856_setbit(client, 0xdc, 6, 0);
 225                         break;
 226                 case 1:
 227                         bt856_setbit(client, 0xde, 4, 0);
 228                         bt856_setbit(client, 0xde, 3, 1);
 229                         bt856_setbit(client, 0xdc, 3, 1);
 230                         bt856_setbit(client, 0xdc, 6, 1);
 231                         break;
 232                 case 2: // Color bar
 233                         bt856_setbit(client, 0xdc, 3, 0);
 234                         bt856_setbit(client, 0xde, 4, 1);
 235                         break;
 236                 default:
 237                         return -EINVAL;
 238
 239                 }
 240
 241                 if (debug != 0)
 242                         bt856_dump(client);
 243         }
 244                 break;
 245
 246         case ENCODER_SET_OUTPUT:
 247         {
 248                 int *iarg = arg;
 249
 250                 dprintk(1, KERN_INFO "%s: set output %d\n", I2C_NAME(client),
 251                         *iarg);
 252
 253                 /* not much choice of outputs */
 254                 if (*iarg != 0) {
 255                         return -EINVAL;
 256                 }
 257         }
 258                 break;
 259
 260         case ENCODER_ENABLE_OUTPUT:
 261         {
 262                 int *iarg = arg;
 263
 264                 encoder->enable = !!*iarg;
 265
 266                 dprintk(1, KERN_INFO "%s: enable output %d\n",
 267                         I2C_NAME(client), encoder->enable);
 268         }
 269                 break;
 270
 271         default:
 272                 return -EINVAL;
 273         }
 274
 275         return 0;
 276 }
 277
 278 /* ----------------------------------------------------------------------- */
 279
 280 /*
 281  * Generic i2c probe
 282  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 283  */
 284 static unsigned short normal_i2c[] = { I2C_BT856 >> 1, I2C_CLIENT_END };
 285
 286 static unsigned short ignore = I2C_CLIENT_END;
 287
 288 static struct i2c_client_address_data addr_data = {
 289         .normal_i2c             = normal_i2c,
 290         .probe                  = &ignore,
 291         .ignore                 = &ignore,
 292 };
 293
 294 static struct i2c_driver i2c_driver_bt856;
 295
 296 static int
 297 bt856_detect_client (struct i2c_adapter *adapter,
 298                      int                 address,
 299                      int                 kind)
 300 {
 301         int i;
 302         struct i2c_client *client;
 303         struct bt856 *encoder;
 304
 305         dprintk(1,
 306                 KERN_INFO
 307                 "bt856.c: detecting bt856 client on address 0x%x\n",
 308                 address << 1);
 309
 310         /* Check if the adapter supports the needed features */
 311         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 312                 return 0;
 313
 314         client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
 315         if (client == 0)
 316                 return -ENOMEM;
 317         client->addr = address;
 318         client->adapter = adapter;
 319         client->driver = &i2c_driver_bt856;
 320         strlcpy(I2C_NAME(client), "bt856", sizeof(I2C_NAME(client)));
 321
 322         encoder = kzalloc(sizeof(struct bt856), GFP_KERNEL);
 323         if (encoder == NULL) {
 324                 kfree(client);
 325                 return -ENOMEM;
 326         }
 327         encoder->norm = VIDEO_MODE_NTSC;
 328         encoder->enable = 1;
 329         i2c_set_clientdata(client, encoder);
 330
 331         i = i2c_attach_client(client);
 332         if (i) {
 333                 kfree(client);
 334                 kfree(encoder);
 335                 return i;
 336         }
 337
 338         bt856_write(client, 0xdc, 0x18);
 339         bt856_write(client, 0xda, 0);
 340         bt856_write(client, 0xde, 0);
 341
 342         bt856_setbit(client, 0xdc, 3, 1);
 343         //bt856_setbit(client, 0xdc, 6, 0);
 344         bt856_setbit(client, 0xdc, 4, 1);
 345
 346         switch (encoder->norm) {
 347
 348         case VIDEO_MODE_NTSC:
 349                 bt856_setbit(client, 0xdc, 2, 0);
 350                 break;
 351
 352         case VIDEO_MODE_PAL:
 353                 bt856_setbit(client, 0xdc, 2, 1);
 354                 break;
 355         }
 356
 357         bt856_setbit(client, 0xdc, 1, 1);
 358         bt856_setbit(client, 0xde, 4, 0);
 359         bt856_setbit(client, 0xde, 3, 1);
 360
 361         if (debug != 0)
 362                 bt856_dump(client);
 363
 364         dprintk(1, KERN_INFO "%s_attach: at address 0x%x\n", I2C_NAME(client),
 365                 client->addr << 1);
 366
 367         return 0;
 368 }
 369
 370 static int
 371 bt856_attach_adapter (struct i2c_adapter *adapter)
 372 {
 373         dprintk(1,
 374                 KERN_INFO
 375                 "bt856.c: starting probe for adapter %s (0x%x)\n",
 376                 I2C_NAME(adapter), adapter->id);
 377         return i2c_probe(adapter, &addr_data, &bt856_detect_client);
 378 }
 379
 380 static int
 381 bt856_detach_client (struct i2c_client *client)
 382 {
 383         struct bt856 *encoder = i2c_get_clientdata(client);
 384         int err;
 385
 386         err = i2c_detach_client(client);
 387         if (err) {
 388                 return err;
 389         }
 390
 391         kfree(encoder);
 392         kfree(client);
 393
 394         return 0;
 395 }
 396
 397 /* ----------------------------------------------------------------------- */
 398
 399 static struct i2c_driver i2c_driver_bt856 = {
 400         .driver = {
 401                 .name = "bt856",
 402         },
 403
 404         .id = I2C_DRIVERID_BT856,
 405
 406         .attach_adapter = bt856_attach_adapter,
 407         .detach_client = bt856_detach_client,
 408         .command = bt856_command,
 409 };
 410
 411 static int __init
 412 bt856_init (void)
 413 {
 414         return i2c_add_driver(&i2c_driver_bt856);
 415 }
 416
 417 static void __exit
 418 bt856_exit (void)
 419 {
 420         i2c_del_driver(&i2c_driver_bt856);
 421 }
 422
 423 module_init(bt856_init);
 424 module_exit(bt856_exit);