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