drivers/media/i2c/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/slab.h>
  34 #include <linux/ioctl.h>
  35 #include <asm/uaccess.h>
  36 #include <linux/i2c.h>
  37 #include <linux/videodev2.h>
  38 #include <media/v4l2-device.h>
  39
  40 MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
  41 MODULE_AUTHOR("Mike Bernson & Dave Perks");
  42 MODULE_LICENSE("GPL");
  43
  44 static int debug;
  45 module_param(debug, int, 0);
  46 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  47
  48
  49 /* ----------------------------------------------------------------------- */
  50
  51 #define BT856_REG_OFFSET        0xDA
  52 #define BT856_NR_REG            6
  53
  54 struct bt856 {
  55         struct v4l2_subdev sd;
  56         unsigned char reg[BT856_NR_REG];
  57
  58         v4l2_std_id norm;
  59 };
  60
  61 static inline struct bt856 *to_bt856(struct v4l2_subdev *sd)
  62 {
  63         return container_of(sd, struct bt856, sd);
  64 }
  65
  66 /* ----------------------------------------------------------------------- */
  67
  68 static inline int bt856_write(struct bt856 *encoder, u8 reg, u8 value)
  69 {
  70         struct i2c_client *client = v4l2_get_subdevdata(&encoder->sd);
  71
  72         encoder->reg[reg - BT856_REG_OFFSET] = value;
  73         return i2c_smbus_write_byte_data(client, reg, value);
  74 }
  75
  76 static inline int bt856_setbit(struct bt856 *encoder, u8 reg, u8 bit, u8 value)
  77 {
  78         return bt856_write(encoder, reg,
  79                 (encoder->reg[reg - BT856_REG_OFFSET] & ~(1 << bit)) |
  80                                 (value ? (1 << bit) : 0));
  81 }
  82
  83 static void bt856_dump(struct bt856 *encoder)
  84 {
  85         int i;
  86
  87         v4l2_info(&encoder->sd, "register dump:\n");
  88         for (i = 0; i < BT856_NR_REG; i += 2)
  89                 printk(KERN_CONT " %02x", encoder->reg[i]);
  90         printk(KERN_CONT "\n");
  91 }
  92
  93 /* ----------------------------------------------------------------------- */
  94
  95 static int bt856_init(struct v4l2_subdev *sd, u32 arg)
  96 {
  97         struct bt856 *encoder = to_bt856(sd);
  98
  99         /* This is just for testing!!! */
 100         v4l2_dbg(1, debug, sd, "init\n");
 101         bt856_write(encoder, 0xdc, 0x18);
 102         bt856_write(encoder, 0xda, 0);
 103         bt856_write(encoder, 0xde, 0);
 104
 105         bt856_setbit(encoder, 0xdc, 3, 1);
 106         /*bt856_setbit(encoder, 0xdc, 6, 0);*/
 107         bt856_setbit(encoder, 0xdc, 4, 1);
 108
 109         if (encoder->norm & V4L2_STD_NTSC)
 110                 bt856_setbit(encoder, 0xdc, 2, 0);
 111         else
 112                 bt856_setbit(encoder, 0xdc, 2, 1);
 113
 114         bt856_setbit(encoder, 0xdc, 1, 1);
 115         bt856_setbit(encoder, 0xde, 4, 0);
 116         bt856_setbit(encoder, 0xde, 3, 1);
 117         if (debug != 0)
 118                 bt856_dump(encoder);
 119         return 0;
 120 }
 121
 122 static int bt856_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
 123 {
 124         struct bt856 *encoder = to_bt856(sd);
 125
 126         v4l2_dbg(1, debug, sd, "set norm %llx\n", (unsigned long long)std);
 127
 128         if (std & V4L2_STD_NTSC) {
 129                 bt856_setbit(encoder, 0xdc, 2, 0);
 130         } else if (std & V4L2_STD_PAL) {
 131                 bt856_setbit(encoder, 0xdc, 2, 1);
 132                 bt856_setbit(encoder, 0xda, 0, 0);
 133                 /*bt856_setbit(encoder, 0xda, 0, 1);*/
 134         } else {
 135                 return -EINVAL;
 136         }
 137         encoder->norm = std;
 138         if (debug != 0)
 139                 bt856_dump(encoder);
 140         return 0;
 141 }
 142
 143 static int bt856_s_routing(struct v4l2_subdev *sd,
 144                            u32 input, u32 output, u32 config)
 145 {
 146         struct bt856 *encoder = to_bt856(sd);
 147
 148         v4l2_dbg(1, debug, sd, "set input %d\n", input);
 149
 150         /* We only have video bus.
 151          * input= 0: input is from bt819
 152          * input= 1: input is from ZR36060 */
 153         switch (input) {
 154         case 0:
 155                 bt856_setbit(encoder, 0xde, 4, 0);
 156                 bt856_setbit(encoder, 0xde, 3, 1);
 157                 bt856_setbit(encoder, 0xdc, 3, 1);
 158                 bt856_setbit(encoder, 0xdc, 6, 0);
 159                 break;
 160         case 1:
 161                 bt856_setbit(encoder, 0xde, 4, 0);
 162                 bt856_setbit(encoder, 0xde, 3, 1);
 163                 bt856_setbit(encoder, 0xdc, 3, 1);
 164                 bt856_setbit(encoder, 0xdc, 6, 1);
 165                 break;
 166         case 2: /* Color bar */
 167                 bt856_setbit(encoder, 0xdc, 3, 0);
 168                 bt856_setbit(encoder, 0xde, 4, 1);
 169                 break;
 170         default:
 171                 return -EINVAL;
 172         }
 173
 174         if (debug != 0)
 175                 bt856_dump(encoder);
 176         return 0;
 177 }
 178
 179 /* ----------------------------------------------------------------------- */
 180
 181 static const struct v4l2_subdev_core_ops bt856_core_ops = {
 182         .init = bt856_init,
 183 };
 184
 185 static const struct v4l2_subdev_video_ops bt856_video_ops = {
 186         .s_std_output = bt856_s_std_output,
 187         .s_routing = bt856_s_routing,
 188 };
 189
 190 static const struct v4l2_subdev_ops bt856_ops = {
 191         .core = &bt856_core_ops,
 192         .video = &bt856_video_ops,
 193 };
 194
 195 /* ----------------------------------------------------------------------- */
 196
 197 static int bt856_probe(struct i2c_client *client,
 198                         const struct i2c_device_id *id)
 199 {
 200         struct bt856 *encoder;
 201         struct v4l2_subdev *sd;
 202
 203         /* Check if the adapter supports the needed features */
 204         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 205                 return -ENODEV;
 206
 207         v4l_info(client, "chip found @ 0x%x (%s)\n",
 208                         client->addr << 1, client->adapter->name);
 209
 210         encoder = devm_kzalloc(&client->dev, sizeof(*encoder), GFP_KERNEL);
 211         if (encoder == NULL)
 212                 return -ENOMEM;
 213         sd = &encoder->sd;
 214         v4l2_i2c_subdev_init(sd, client, &bt856_ops);
 215         encoder->norm = V4L2_STD_NTSC;
 216
 217         bt856_write(encoder, 0xdc, 0x18);
 218         bt856_write(encoder, 0xda, 0);
 219         bt856_write(encoder, 0xde, 0);
 220
 221         bt856_setbit(encoder, 0xdc, 3, 1);
 222         /*bt856_setbit(encoder, 0xdc, 6, 0);*/
 223         bt856_setbit(encoder, 0xdc, 4, 1);
 224
 225         if (encoder->norm & V4L2_STD_NTSC)
 226                 bt856_setbit(encoder, 0xdc, 2, 0);
 227         else
 228                 bt856_setbit(encoder, 0xdc, 2, 1);
 229
 230         bt856_setbit(encoder, 0xdc, 1, 1);
 231         bt856_setbit(encoder, 0xde, 4, 0);
 232         bt856_setbit(encoder, 0xde, 3, 1);
 233
 234         if (debug != 0)
 235                 bt856_dump(encoder);
 236         return 0;
 237 }
 238
 239 static int bt856_remove(struct i2c_client *client)
 240 {
 241         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 242
 243         v4l2_device_unregister_subdev(sd);
 244         return 0;
 245 }
 246
 247 static const struct i2c_device_id bt856_id[] = {
 248         { "bt856", 0 },
 249         { }
 250 };
 251 MODULE_DEVICE_TABLE(i2c, bt856_id);
 252
 253 static struct i2c_driver bt856_driver = {
 254         .driver = {
 255                 .name   = "bt856",
 256         },
 257         .probe          = bt856_probe,
 258         .remove         = bt856_remove,
 259         .id_table       = bt856_id,
 260 };
 261
 262 module_i2c_driver(bt856_driver);