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/types.h>
  33 #include <linux/ioctl.h>
  34 #include <asm/uaccess.h>
  35 #include <linux/i2c.h>
  36 #include <linux/i2c-id.h>
  37 #include <linux/videodev.h>
  38 #include <linux/video_encoder.h>
  39 #include <media/v4l2-common.h>
  40 #include <media/v4l2-i2c-drv-legacy.h>
  41
  42 MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
  43 MODULE_AUTHOR("Mike Bernson & Dave Perks");
  44 MODULE_LICENSE("GPL");
  45
  46 static int debug;
  47 module_param(debug, int, 0);
  48 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  49
  50 /* ----------------------------------------------------------------------- */
  51
  52 #define BT856_REG_OFFSET        0xDA
  53 #define BT856_NR_REG            6
  54
  55 struct bt856 {
  56         unsigned char reg[BT856_NR_REG];
  57
  58         int norm;
  59         int enable;
  60 };
  61
  62 /* ----------------------------------------------------------------------- */
  63
  64 static inline int bt856_write(struct i2c_client *client, u8 reg, u8 value)
  65 {
  66         struct bt856 *encoder = i2c_get_clientdata(client);
  67
  68         encoder->reg[reg - BT856_REG_OFFSET] = value;
  69         return i2c_smbus_write_byte_data(client, reg, value);
  70 }
  71
  72 static inline int bt856_setbit(struct i2c_client *client, u8 reg, u8 bit, u8 value)
  73 {
  74         struct bt856 *encoder = i2c_get_clientdata(client);
  75
  76         return bt856_write(client, reg,
  77                 (encoder->reg[reg - BT856_REG_OFFSET] & ~(1 << bit)) |
  78                                 (value ? (1 << bit) : 0));
  79 }
  80
  81 static void bt856_dump(struct i2c_client *client)
  82 {
  83         int i;
  84         struct bt856 *encoder = i2c_get_clientdata(client);
  85
  86         v4l_info(client, "register dump:\n");
  87         for (i = 0; i < BT856_NR_REG; i += 2)
  88                 printk(KERN_CONT " %02x", encoder->reg[i]);
  89         printk(KERN_CONT "\n");
  90 }
  91
  92 /* ----------------------------------------------------------------------- */
  93
  94 static int bt856_command(struct i2c_client *client, unsigned cmd, void *arg)
  95 {
  96         struct bt856 *encoder = i2c_get_clientdata(client);
  97
  98         switch (cmd) {
  99         case 0:
 100                 /* This is just for testing!!! */
 101                 v4l_dbg(1, debug, client, "init\n");
 102                 bt856_write(client, 0xdc, 0x18);
 103                 bt856_write(client, 0xda, 0);
 104                 bt856_write(client, 0xde, 0);
 105
 106                 bt856_setbit(client, 0xdc, 3, 1);
 107                 //bt856_setbit(client, 0xdc, 6, 0);
 108                 bt856_setbit(client, 0xdc, 4, 1);
 109
 110                 switch (encoder->norm) {
 111                 case VIDEO_MODE_NTSC:
 112                         bt856_setbit(client, 0xdc, 2, 0);
 113                         break;
 114
 115                 case VIDEO_MODE_PAL:
 116                         bt856_setbit(client, 0xdc, 2, 1);
 117                         break;
 118                 }
 119
 120                 bt856_setbit(client, 0xdc, 1, 1);
 121                 bt856_setbit(client, 0xde, 4, 0);
 122                 bt856_setbit(client, 0xde, 3, 1);
 123                 if (debug != 0)
 124                         bt856_dump(client);
 125                 break;
 126
 127         case ENCODER_GET_CAPABILITIES:
 128         {
 129                 struct video_encoder_capability *cap = arg;
 130
 131                 v4l_dbg(1, debug, client, "get capabilities\n");
 132
 133                 cap->flags = VIDEO_ENCODER_PAL |
 134                              VIDEO_ENCODER_NTSC |
 135                              VIDEO_ENCODER_CCIR;
 136                 cap->inputs = 2;
 137                 cap->outputs = 1;
 138                 break;
 139         }
 140
 141         case ENCODER_SET_NORM:
 142         {
 143                 int *iarg = arg;
 144
 145                 v4l_dbg(1, debug, client, "set norm %d\n", *iarg);
 146
 147                 switch (*iarg) {
 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                         bt856_setbit(client, 0xda, 0, 0);
 155                         //bt856_setbit(client, 0xda, 0, 1);
 156                         break;
 157
 158                 default:
 159                         return -EINVAL;
 160                 }
 161                 encoder->norm = *iarg;
 162                 if (debug != 0)
 163                         bt856_dump(client);
 164                 break;
 165         }
 166
 167         case ENCODER_SET_INPUT:
 168         {
 169                 int *iarg = arg;
 170
 171                 v4l_dbg(1, debug, client, "set input %d\n", *iarg);
 172
 173                 /* We only have video bus.
 174                  * iarg = 0: input is from bt819
 175                  * iarg = 1: input is from ZR36060 */
 176                 switch (*iarg) {
 177                 case 0:
 178                         bt856_setbit(client, 0xde, 4, 0);
 179                         bt856_setbit(client, 0xde, 3, 1);
 180                         bt856_setbit(client, 0xdc, 3, 1);
 181                         bt856_setbit(client, 0xdc, 6, 0);
 182                         break;
 183                 case 1:
 184                         bt856_setbit(client, 0xde, 4, 0);
 185                         bt856_setbit(client, 0xde, 3, 1);
 186                         bt856_setbit(client, 0xdc, 3, 1);
 187                         bt856_setbit(client, 0xdc, 6, 1);
 188                         break;
 189                 case 2: // Color bar
 190                         bt856_setbit(client, 0xdc, 3, 0);
 191                         bt856_setbit(client, 0xde, 4, 1);
 192                         break;
 193                 default:
 194                         return -EINVAL;
 195                 }
 196
 197                 if (debug != 0)
 198                         bt856_dump(client);
 199                 break;
 200         }
 201
 202         case ENCODER_SET_OUTPUT:
 203         {
 204                 int *iarg = arg;
 205
 206                 v4l_dbg(1, debug, client, "set output %d\n", *iarg);
 207
 208                 /* not much choice of outputs */
 209                 if (*iarg != 0)
 210                         return -EINVAL;
 211                 break;
 212         }
 213
 214         case ENCODER_ENABLE_OUTPUT:
 215         {
 216                 int *iarg = arg;
 217
 218                 encoder->enable = !!*iarg;
 219
 220                 v4l_dbg(1, debug, client, "enable output %d\n", encoder->enable);
 221                 break;
 222         }
 223
 224         default:
 225                 return -EINVAL;
 226         }
 227
 228         return 0;
 229 }
 230
 231 /* ----------------------------------------------------------------------- */
 232
 233 static unsigned short normal_i2c[] = { 0x88 >> 1, I2C_CLIENT_END };
 234
 235 I2C_CLIENT_INSMOD;
 236
 237 static int bt856_probe(struct i2c_client *client,
 238                         const struct i2c_device_id *id)
 239 {
 240         struct bt856 *encoder;
 241
 242         /* Check if the adapter supports the needed features */
 243         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 244                 return -ENODEV;
 245
 246         v4l_info(client, "chip found @ 0x%x (%s)\n",
 247                         client->addr << 1, client->adapter->name);
 248
 249         encoder = kzalloc(sizeof(struct bt856), GFP_KERNEL);
 250         if (encoder == NULL)
 251                 return -ENOMEM;
 252         encoder->norm = VIDEO_MODE_NTSC;
 253         encoder->enable = 1;
 254         i2c_set_clientdata(client, encoder);
 255
 256         bt856_write(client, 0xdc, 0x18);
 257         bt856_write(client, 0xda, 0);
 258         bt856_write(client, 0xde, 0);
 259
 260         bt856_setbit(client, 0xdc, 3, 1);
 261         //bt856_setbit(client, 0xdc, 6, 0);
 262         bt856_setbit(client, 0xdc, 4, 1);
 263
 264         switch (encoder->norm) {
 265
 266         case VIDEO_MODE_NTSC:
 267                 bt856_setbit(client, 0xdc, 2, 0);
 268                 break;
 269
 270         case VIDEO_MODE_PAL:
 271                 bt856_setbit(client, 0xdc, 2, 1);
 272                 break;
 273         }
 274
 275         bt856_setbit(client, 0xdc, 1, 1);
 276         bt856_setbit(client, 0xde, 4, 0);
 277         bt856_setbit(client, 0xde, 3, 1);
 278
 279         if (debug != 0)
 280                 bt856_dump(client);
 281         return 0;
 282 }
 283
 284 static int bt856_remove(struct i2c_client *client)
 285 {
 286         kfree(i2c_get_clientdata(client));
 287         return 0;
 288 }
 289
 290 static const struct i2c_device_id bt856_id[] = {
 291         { "bt856", 0 },
 292         { }
 293 };
 294 MODULE_DEVICE_TABLE(i2c, bt856_id);
 295
 296 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 297         .name = "bt856",
 298         .driverid = I2C_DRIVERID_BT856,
 299         .command = bt856_command,
 300         .probe = bt856_probe,
 301         .remove = bt856_remove,
 302         .id_table = bt856_id,
 303 };