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/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 #include <linux/i2c-dev.h>
  57
  58 #define I2C_NAME(s) (s)->name
  59
  60 #include <linux/video_encoder.h>
  61
  62 static int debug = 0;
  63 module_param(debug, int, 0);
  64 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  65
  66 #define dprintk(num, format, args...) \
  67         do { \
  68                 if (debug >= num) \
  69                         printk(format, ##args); \
  70         } while (0)
  71
  72 /* ----------------------------------------------------------------------- */
  73
  74 #define REG_OFFSET  0xCE
  75
  76 struct bt856 {
  77         unsigned char reg[32];
  78
  79         int norm;
  80         int enable;
  81         int bright;
  82         int contrast;
  83         int hue;
  84         int sat;
  85 };
  86
  87 #define   I2C_BT856        0x88
  88
  89 /* ----------------------------------------------------------------------- */
  90
  91 static inline int
  92 bt856_write (struct i2c_client *client,
  93              u8                 reg,
  94              u8                 value)
  95 {
  96         struct bt856 *encoder = i2c_get_clientdata(client);
  97
  98         encoder->reg[reg - REG_OFFSET] = value;
  99         return i2c_smbus_write_byte_data(client, reg, value);
 100 }
 101
 102 static inline int
 103 bt856_setbit (struct i2c_client *client,
 104               u8                 reg,
 105               u8                 bit,
 106               u8                 value)
 107 {
 108         struct bt856 *encoder = i2c_get_clientdata(client);
 109
 110         return bt856_write(client, reg,
 111                            (encoder->
 112                             reg[reg - REG_OFFSET] & ~(1 << bit)) |
 113                             (value ? (1 << bit) : 0));
 114 }
 115
 116 static void
 117 bt856_dump (struct i2c_client *client)
 118 {
 119         int i;
 120         struct bt856 *encoder = i2c_get_clientdata(client);
 121
 122         printk(KERN_INFO "%s: register dump:", I2C_NAME(client));
 123         for (i = 0xd6; i <= 0xde; i += 2)
 124                 printk(" %02x", encoder->reg[i - REG_OFFSET]);
 125         printk("\n");
 126 }
 127
 128 /* ----------------------------------------------------------------------- */
 129
 130 static int
 131 bt856_command (struct i2c_client *client,
 132                unsigned int       cmd,
 133                void              *arg)
 134 {
 135         struct bt856 *encoder = i2c_get_clientdata(client);
 136
 137         switch (cmd) {
 138
 139         case 0:
 140                 /* This is just for testing!!! */
 141                 dprintk(1, KERN_INFO "bt856: init\n");
 142                 bt856_write(client, 0xdc, 0x18);
 143                 bt856_write(client, 0xda, 0);
 144                 bt856_write(client, 0xde, 0);
 145
 146                 bt856_setbit(client, 0xdc, 3, 1);
 147                 //bt856_setbit(client, 0xdc, 6, 0);
 148                 bt856_setbit(client, 0xdc, 4, 1);
 149
 150                 switch (encoder->norm) {
 151
 152                 case VIDEO_MODE_NTSC:
 153                         bt856_setbit(client, 0xdc, 2, 0);
 154                         break;
 155
 156                 case VIDEO_MODE_PAL:
 157                         bt856_setbit(client, 0xdc, 2, 1);
 158                         break;
 159                 }
 160
 161                 bt856_setbit(client, 0xdc, 1, 1);
 162                 bt856_setbit(client, 0xde, 4, 0);
 163                 bt856_setbit(client, 0xde, 3, 1);
 164                 if (debug != 0)
 165                         bt856_dump(client);
 166                 break;
 167
 168         case ENCODER_GET_CAPABILITIES:
 169         {
 170                 struct video_encoder_capability *cap = arg;
 171
 172                 dprintk(1, KERN_INFO "%s: get capabilities\n",
 173                         I2C_NAME(client));
 174
 175                 cap->flags = VIDEO_ENCODER_PAL |
 176                              VIDEO_ENCODER_NTSC |
 177                              VIDEO_ENCODER_CCIR;
 178                 cap->inputs = 2;
 179                 cap->outputs = 1;
 180         }
 181                 break;
 182
 183         case ENCODER_SET_NORM:
 184         {
 185                 int *iarg = arg;
 186
 187                 dprintk(1, KERN_INFO "%s: set norm %d\n", I2C_NAME(client),
 188                         *iarg);
 189
 190                 switch (*iarg) {
 191
 192                 case VIDEO_MODE_NTSC:
 193                         bt856_setbit(client, 0xdc, 2, 0);
 194                         break;
 195
 196                 case VIDEO_MODE_PAL:
 197                         bt856_setbit(client, 0xdc, 2, 1);
 198                         bt856_setbit(client, 0xda, 0, 0);
 199                         //bt856_setbit(client, 0xda, 0, 1);
 200                         break;
 201
 202                 default:
 203                         return -EINVAL;
 204
 205                 }
 206                 encoder->norm = *iarg;
 207                 if (debug != 0)
 208                         bt856_dump(client);
 209         }
 210                 break;
 211
 212         case ENCODER_SET_INPUT:
 213         {
 214                 int *iarg = arg;
 215
 216                 dprintk(1, KERN_INFO "%s: set input %d\n", I2C_NAME(client),
 217                         *iarg);
 218
 219                 /* We only have video bus.
 220                  * iarg = 0: input is from bt819
 221                  * iarg = 1: input is from ZR36060 */
 222
 223                 switch (*iarg) {
 224
 225                 case 0:
 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, 0);
 230                         break;
 231                 case 1:
 232                         bt856_setbit(client, 0xde, 4, 0);
 233                         bt856_setbit(client, 0xde, 3, 1);
 234                         bt856_setbit(client, 0xdc, 3, 1);
 235                         bt856_setbit(client, 0xdc, 6, 1);
 236                         break;
 237                 case 2: // Color bar
 238                         bt856_setbit(client, 0xdc, 3, 0);
 239                         bt856_setbit(client, 0xde, 4, 1);
 240                         break;
 241                 default:
 242                         return -EINVAL;
 243
 244                 }
 245
 246                 if (debug != 0)
 247                         bt856_dump(client);
 248         }
 249                 break;
 250
 251         case ENCODER_SET_OUTPUT:
 252         {
 253                 int *iarg = arg;
 254
 255                 dprintk(1, KERN_INFO "%s: set output %d\n", I2C_NAME(client),
 256                         *iarg);
 257
 258                 /* not much choice of outputs */
 259                 if (*iarg != 0) {
 260                         return -EINVAL;
 261                 }
 262         }
 263                 break;
 264
 265         case ENCODER_ENABLE_OUTPUT:
 266         {
 267                 int *iarg = arg;
 268
 269                 encoder->enable = !!*iarg;
 270
 271                 dprintk(1, KERN_INFO "%s: enable output %d\n",
 272                         I2C_NAME(client), encoder->enable);
 273         }
 274                 break;
 275
 276         default:
 277                 return -EINVAL;
 278         }
 279
 280         return 0;
 281 }
 282
 283 /* ----------------------------------------------------------------------- */
 284
 285 /*
 286  * Generic i2c probe
 287  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 288  */
 289 static unsigned short normal_i2c[] = { I2C_BT856 >> 1, I2C_CLIENT_END };
 290
 291 static unsigned short ignore = I2C_CLIENT_END;
 292
 293 static struct i2c_client_address_data addr_data = {
 294         .normal_i2c             = normal_i2c,
 295         .probe                  = &ignore,
 296         .ignore                 = &ignore,
 297 };
 298
 299 static struct i2c_driver i2c_driver_bt856;
 300
 301 static int
 302 bt856_detect_client (struct i2c_adapter *adapter,
 303                      int                 address,
 304                      int                 kind)
 305 {
 306         int i;
 307         struct i2c_client *client;
 308         struct bt856 *encoder;
 309
 310         dprintk(1,
 311                 KERN_INFO
 312                 "bt856.c: detecting bt856 client on address 0x%x\n",
 313                 address << 1);
 314
 315         /* Check if the adapter supports the needed features */
 316         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 317                 return 0;
 318
 319         client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
 320         if (client == 0)
 321                 return -ENOMEM;
 322         memset(client, 0, sizeof(struct i2c_client));
 323         client->addr = address;
 324         client->adapter = adapter;
 325         client->driver = &i2c_driver_bt856;
 326         client->flags = I2C_CLIENT_ALLOW_USE;
 327         strlcpy(I2C_NAME(client), "bt856", sizeof(I2C_NAME(client)));
 328
 329         encoder = kmalloc(sizeof(struct bt856), GFP_KERNEL);
 330         if (encoder == NULL) {
 331                 kfree(client);
 332                 return -ENOMEM;
 333         }
 334         memset(encoder, 0, sizeof(struct bt856));
 335         encoder->norm = VIDEO_MODE_NTSC;
 336         encoder->enable = 1;
 337         i2c_set_clientdata(client, encoder);
 338
 339         i = i2c_attach_client(client);
 340         if (i) {
 341                 kfree(client);
 342                 kfree(encoder);
 343                 return i;
 344         }
 345
 346         bt856_write(client, 0xdc, 0x18);
 347         bt856_write(client, 0xda, 0);
 348         bt856_write(client, 0xde, 0);
 349
 350         bt856_setbit(client, 0xdc, 3, 1);
 351         //bt856_setbit(client, 0xdc, 6, 0);
 352         bt856_setbit(client, 0xdc, 4, 1);
 353
 354         switch (encoder->norm) {
 355
 356         case VIDEO_MODE_NTSC:
 357                 bt856_setbit(client, 0xdc, 2, 0);
 358                 break;
 359
 360         case VIDEO_MODE_PAL:
 361                 bt856_setbit(client, 0xdc, 2, 1);
 362                 break;
 363         }
 364
 365         bt856_setbit(client, 0xdc, 1, 1);
 366         bt856_setbit(client, 0xde, 4, 0);
 367         bt856_setbit(client, 0xde, 3, 1);
 368
 369         if (debug != 0)
 370                 bt856_dump(client);
 371
 372         dprintk(1, KERN_INFO "%s_attach: at address 0x%x\n", I2C_NAME(client),
 373                 client->addr << 1);
 374
 375         return 0;
 376 }
 377
 378 static int
 379 bt856_attach_adapter (struct i2c_adapter *adapter)
 380 {
 381         dprintk(1,
 382                 KERN_INFO
 383                 "bt856.c: starting probe for adapter %s (0x%x)\n",
 384                 I2C_NAME(adapter), adapter->id);
 385         return i2c_probe(adapter, &addr_data, &bt856_detect_client);
 386 }
 387
 388 static int
 389 bt856_detach_client (struct i2c_client *client)
 390 {
 391         struct bt856 *encoder = i2c_get_clientdata(client);
 392         int err;
 393
 394         err = i2c_detach_client(client);
 395         if (err) {
 396                 return err;
 397         }
 398
 399         kfree(encoder);
 400         kfree(client);
 401
 402         return 0;
 403 }
 404
 405 /* ----------------------------------------------------------------------- */
 406
 407 static struct i2c_driver i2c_driver_bt856 = {
 408         .owner = THIS_MODULE,
 409         .name = "bt856",
 410
 411         .id = I2C_DRIVERID_BT856,
 412         .flags = I2C_DF_NOTIFY,
 413
 414         .attach_adapter = bt856_attach_adapter,
 415         .detach_client = bt856_detach_client,
 416         .command = bt856_command,
 417 };
 418
 419 static int __init
 420 bt856_init (void)
 421 {
 422         return i2c_add_driver(&i2c_driver_bt856);
 423 }
 424
 425 static void __exit
 426 bt856_exit (void)
 427 {
 428         i2c_del_driver(&i2c_driver_bt856);
 429 }
 430
 431 module_init(bt856_init);
 432 module_exit(bt856_exit);