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   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/sched.h>
  46 #include <linux/types.h>
  47
  48 #include <linux/videodev.h>
  49 #include <asm/uaccess.h>
  50
  51 MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
  52 MODULE_AUTHOR("Mike Bernson & Dave Perks");
  53 MODULE_LICENSE("GPL");
  54
  55 #include <linux/i2c.h>
  56
  57 #define I2C_NAME(s) (s)->name
  58
  59 #include <linux/video_encoder.h>
  60
  61 static int debug = 0;
  62 module_param(debug, int, 0);
  63 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  64
  65 #define dprintk(num, format, args...) \
  66         do { \
  67                 if (debug >= num) \
  68                         printk(format, ##args); \
  69         } while (0)
  70
  71 /* ----------------------------------------------------------------------- */
  72
  73 #define REG_OFFSET      0xDA
  74 #define BT856_NR_REG    6
  75
  76 struct bt856 {
  77         unsigned char reg[BT856_NR_REG];
  78
  79         int norm;
  80         int enable;
  81 };
  82
  83 #define   I2C_BT856        0x88
  84
  85 /* ----------------------------------------------------------------------- */
  86
  87 static inline int
  88 bt856_write (struct i2c_client *client,
  89              u8                 reg,
  90              u8                 value)
  91 {
  92         struct bt856 *encoder = i2c_get_clientdata(client);
  93
  94         encoder->reg[reg - REG_OFFSET] = value;
  95         return i2c_smbus_write_byte_data(client, reg, value);
  96 }
  97
  98 static inline int
  99 bt856_setbit (struct i2c_client *client,
 100               u8                 reg,
 101               u8                 bit,
 102               u8                 value)
 103 {
 104         struct bt856 *encoder = i2c_get_clientdata(client);
 105
 106         return bt856_write(client, reg,
 107                            (encoder->
 108                             reg[reg - REG_OFFSET] & ~(1 << bit)) |
 109                             (value ? (1 << bit) : 0));
 110 }
 111
 112 static void
 113 bt856_dump (struct i2c_client *client)
 114 {
 115         int i;
 116         struct bt856 *encoder = i2c_get_clientdata(client);
 117
 118         printk(KERN_INFO "%s: register dump:", I2C_NAME(client));
 119         for (i = 0; i < BT856_NR_REG; i += 2)
 120                 printk(" %02x", encoder->reg[i]);
 121         printk("\n");
 122 }
 123
 124 /* ----------------------------------------------------------------------- */
 125
 126 static int
 127 bt856_command (struct i2c_client *client,
 128                unsigned int       cmd,
 129                void              *arg)
 130 {
 131         struct bt856 *encoder = i2c_get_clientdata(client);
 132
 133         switch (cmd) {
 134
 135         case 0:
 136                 /* This is just for testing!!! */
 137                 dprintk(1, KERN_INFO "bt856: init\n");
 138                 bt856_write(client, 0xdc, 0x18);
 139                 bt856_write(client, 0xda, 0);
 140                 bt856_write(client, 0xde, 0);
 141
 142                 bt856_setbit(client, 0xdc, 3, 1);
 143                 //bt856_setbit(client, 0xdc, 6, 0);
 144                 bt856_setbit(client, 0xdc, 4, 1);
 145
 146                 switch (encoder->norm) {
 147
 148                 case VIDEO_MODE_NTSC:
 149                         bt856_setbit(client, 0xdc, 2, 0);
 150                         break;
 151
 152                 case VIDEO_MODE_PAL:
 153                         bt856_setbit(client, 0xdc, 2, 1);
 154                         break;
 155                 }
 156
 157                 bt856_setbit(client, 0xdc, 1, 1);
 158                 bt856_setbit(client, 0xde, 4, 0);
 159                 bt856_setbit(client, 0xde, 3, 1);
 160                 if (debug != 0)
 161                         bt856_dump(client);
 162                 break;
 163
 164         case ENCODER_GET_CAPABILITIES:
 165         {
 166                 struct video_encoder_capability *cap = arg;
 167
 168                 dprintk(1, KERN_INFO "%s: get capabilities\n",
 169                         I2C_NAME(client));
 170
 171                 cap->flags = VIDEO_ENCODER_PAL |
 172                              VIDEO_ENCODER_NTSC |
 173                              VIDEO_ENCODER_CCIR;
 174                 cap->inputs = 2;
 175                 cap->outputs = 1;
 176         }
 177                 break;
 178
 179         case ENCODER_SET_NORM:
 180         {
 181                 int *iarg = arg;
 182
 183                 dprintk(1, KERN_INFO "%s: set norm %d\n", I2C_NAME(client),
 184                         *iarg);
 185
 186                 switch (*iarg) {
 187
 188                 case VIDEO_MODE_NTSC:
 189                         bt856_setbit(client, 0xdc, 2, 0);
 190                         break;
 191
 192                 case VIDEO_MODE_PAL:
 193                         bt856_setbit(client, 0xdc, 2, 1);
 194                         bt856_setbit(client, 0xda, 0, 0);
 195                         //bt856_setbit(client, 0xda, 0, 1);
 196                         break;
 197
 198                 default:
 199                         return -EINVAL;
 200
 201                 }
 202                 encoder->norm = *iarg;
 203                 if (debug != 0)
 204                         bt856_dump(client);
 205         }
 206                 break;
 207
 208         case ENCODER_SET_INPUT:
 209         {
 210                 int *iarg = arg;
 211
 212                 dprintk(1, KERN_INFO "%s: set input %d\n", I2C_NAME(client),
 213                         *iarg);
 214
 215                 /* We only have video bus.
 216                  * iarg = 0: input is from bt819
 217                  * iarg = 1: input is from ZR36060 */
 218
 219                 switch (*iarg) {
 220
 221                 case 0:
 222                         bt856_setbit(client, 0xde, 4, 0);
 223                         bt856_setbit(client, 0xde, 3, 1);
 224                         bt856_setbit(client, 0xdc, 3, 1);
 225                         bt856_setbit(client, 0xdc, 6, 0);
 226                         break;
 227                 case 1:
 228                         bt856_setbit(client, 0xde, 4, 0);
 229                         bt856_setbit(client, 0xde, 3, 1);
 230                         bt856_setbit(client, 0xdc, 3, 1);
 231                         bt856_setbit(client, 0xdc, 6, 1);
 232                         break;
 233                 case 2: // Color bar
 234                         bt856_setbit(client, 0xdc, 3, 0);
 235                         bt856_setbit(client, 0xde, 4, 1);
 236                         break;
 237                 default:
 238                         return -EINVAL;
 239
 240                 }
 241
 242                 if (debug != 0)
 243                         bt856_dump(client);
 244         }
 245                 break;
 246
 247         case ENCODER_SET_OUTPUT:
 248         {
 249                 int *iarg = arg;
 250
 251                 dprintk(1, KERN_INFO "%s: set output %d\n", I2C_NAME(client),
 252                         *iarg);
 253
 254                 /* not much choice of outputs */
 255                 if (*iarg != 0) {
 256                         return -EINVAL;
 257                 }
 258         }
 259                 break;
 260
 261         case ENCODER_ENABLE_OUTPUT:
 262         {
 263                 int *iarg = arg;
 264
 265                 encoder->enable = !!*iarg;
 266
 267                 dprintk(1, KERN_INFO "%s: enable output %d\n",
 268                         I2C_NAME(client), encoder->enable);
 269         }
 270                 break;
 271
 272         default:
 273                 return -EINVAL;
 274         }
 275
 276         return 0;
 277 }
 278
 279 /* ----------------------------------------------------------------------- */
 280
 281 /*
 282  * Generic i2c probe
 283  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 284  */
 285 static unsigned short normal_i2c[] = { I2C_BT856 >> 1, I2C_CLIENT_END };
 286
 287 static unsigned short ignore = I2C_CLIENT_END;
 288
 289 static struct i2c_client_address_data addr_data = {
 290         .normal_i2c             = normal_i2c,
 291         .probe                  = &ignore,
 292         .ignore                 = &ignore,
 293 };
 294
 295 static struct i2c_driver i2c_driver_bt856;
 296
 297 static int
 298 bt856_detect_client (struct i2c_adapter *adapter,
 299                      int                 address,
 300                      int                 kind)
 301 {
 302         int i;
 303         struct i2c_client *client;
 304         struct bt856 *encoder;
 305
 306         dprintk(1,
 307                 KERN_INFO
 308                 "bt856.c: detecting bt856 client on address 0x%x\n",
 309                 address << 1);
 310
 311         /* Check if the adapter supports the needed features */
 312         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 313                 return 0;
 314
 315         client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
 316         if (client == 0)
 317                 return -ENOMEM;
 318         client->addr = address;
 319         client->adapter = adapter;
 320         client->driver = &i2c_driver_bt856;
 321         strlcpy(I2C_NAME(client), "bt856", sizeof(I2C_NAME(client)));
 322
 323         encoder = kzalloc(sizeof(struct bt856), GFP_KERNEL);
 324         if (encoder == NULL) {
 325                 kfree(client);
 326                 return -ENOMEM;
 327         }
 328         encoder->norm = VIDEO_MODE_NTSC;
 329         encoder->enable = 1;
 330         i2c_set_clientdata(client, encoder);
 331
 332         i = i2c_attach_client(client);
 333         if (i) {
 334                 kfree(client);
 335                 kfree(encoder);
 336                 return i;
 337         }
 338
 339         bt856_write(client, 0xdc, 0x18);
 340         bt856_write(client, 0xda, 0);
 341         bt856_write(client, 0xde, 0);
 342
 343         bt856_setbit(client, 0xdc, 3, 1);
 344         //bt856_setbit(client, 0xdc, 6, 0);
 345         bt856_setbit(client, 0xdc, 4, 1);
 346
 347         switch (encoder->norm) {
 348
 349         case VIDEO_MODE_NTSC:
 350                 bt856_setbit(client, 0xdc, 2, 0);
 351                 break;
 352
 353         case VIDEO_MODE_PAL:
 354                 bt856_setbit(client, 0xdc, 2, 1);
 355                 break;
 356         }
 357
 358         bt856_setbit(client, 0xdc, 1, 1);
 359         bt856_setbit(client, 0xde, 4, 0);
 360         bt856_setbit(client, 0xde, 3, 1);
 361
 362         if (debug != 0)
 363                 bt856_dump(client);
 364
 365         dprintk(1, KERN_INFO "%s_attach: at address 0x%x\n", I2C_NAME(client),
 366                 client->addr << 1);
 367
 368         return 0;
 369 }
 370
 371 static int
 372 bt856_attach_adapter (struct i2c_adapter *adapter)
 373 {
 374         dprintk(1,
 375                 KERN_INFO
 376                 "bt856.c: starting probe for adapter %s (0x%x)\n",
 377                 I2C_NAME(adapter), adapter->id);
 378         return i2c_probe(adapter, &addr_data, &bt856_detect_client);
 379 }
 380
 381 static int
 382 bt856_detach_client (struct i2c_client *client)
 383 {
 384         struct bt856 *encoder = i2c_get_clientdata(client);
 385         int err;
 386
 387         err = i2c_detach_client(client);
 388         if (err) {
 389                 return err;
 390         }
 391
 392         kfree(encoder);
 393         kfree(client);
 394
 395         return 0;
 396 }
 397
 398 /* ----------------------------------------------------------------------- */
 399
 400 static struct i2c_driver i2c_driver_bt856 = {
 401         .driver = {
 402                 .name = "bt856",
 403         },
 404
 405         .id = I2C_DRIVERID_BT856,
 406
 407         .attach_adapter = bt856_attach_adapter,
 408         .detach_client = bt856_detach_client,
 409         .command = bt856_command,
 410 };
 411
 412 static int __init
 413 bt856_init (void)
 414 {
 415         return i2c_add_driver(&i2c_driver_bt856);
 416 }
 417
 418 static void __exit
 419 bt856_exit (void)
 420 {
 421         i2c_del_driver(&i2c_driver_bt856);
 422 }
 423
 424 module_init(bt856_init);
 425 module_exit(bt856_exit);