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