drivers/media/i2c/bt866.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3     bt866 - BT866 Digital Video Encoder (Rockwell Part)
   4
   5     Copyright (C) 1999 Mike Bernson <mike@mlb.org>
   6     Copyright (C) 1998 Dave Perks <dperks@ibm.net>
   7
   8     Modifications for LML33/DC10plus unified driver
   9     Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
  10
  11     This code was modify/ported from the saa7111 driver written
  12     by Dave Perks.
  13
  14     This code was adapted for the bt866 by Christer Weinigel and ported
  15     to 2.6 by Martin Samuelsson.
  16
  17 */
  18
  19 #include <linux/module.h>
  20 #include <linux/types.h>
  21 #include <linux/slab.h>
  22 #include <linux/ioctl.h>
  23 #include <linux/uaccess.h>
  24 #include <linux/i2c.h>
  25 #include <linux/videodev2.h>
  26 #include <media/v4l2-device.h>
  27
  28 MODULE_DESCRIPTION("Brooktree-866 video encoder driver");
  29 MODULE_AUTHOR("Mike Bernson & Dave Perks");
  30 MODULE_LICENSE("GPL");
  31
  32 static int debug;
  33 module_param(debug, int, 0);
  34 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  35
  36
  37 /* ----------------------------------------------------------------------- */
  38
  39 struct bt866 {
  40         struct v4l2_subdev sd;
  41         u8 reg[256];
  42 };
  43
  44 static inline struct bt866 *to_bt866(struct v4l2_subdev *sd)
  45 {
  46         return container_of(sd, struct bt866, sd);
  47 }
  48
  49 static int bt866_write(struct bt866 *encoder, u8 subaddr, u8 data)
  50 {
  51         struct i2c_client *client = v4l2_get_subdevdata(&encoder->sd);
  52         u8 buffer[2];
  53         int err;
  54
  55         buffer[0] = subaddr;
  56         buffer[1] = data;
  57
  58         encoder->reg[subaddr] = data;
  59
  60         v4l_dbg(1, debug, client, "write 0x%02x = 0x%02x\n", subaddr, data);
  61
  62         for (err = 0; err < 3;) {
  63                 if (i2c_master_send(client, buffer, 2) == 2)
  64                         break;
  65                 err++;
  66                 v4l_warn(client, "error #%d writing to 0x%02x\n",
  67                                 err, subaddr);
  68                 schedule_timeout_interruptible(msecs_to_jiffies(100));
  69         }
  70         if (err == 3) {
  71                 v4l_warn(client, "giving up\n");
  72                 return -1;
  73         }
  74
  75         return 0;
  76 }
  77
  78 static int bt866_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
  79 {
  80         v4l2_dbg(1, debug, sd, "set norm %llx\n", (unsigned long long)std);
  81
  82         /* Only PAL supported by this driver at the moment! */
  83         if (!(std & V4L2_STD_NTSC))
  84                 return -EINVAL;
  85         return 0;
  86 }
  87
  88 static int bt866_s_routing(struct v4l2_subdev *sd,
  89                            u32 input, u32 output, u32 config)
  90 {
  91         static const __u8 init[] = {
  92                 0xc8, 0xcc, /* CRSCALE */
  93                 0xca, 0x91, /* CBSCALE */
  94                 0xcc, 0x24, /* YC16 | OSDNUM */
  95                 0xda, 0x00, /*  */
  96                 0xdc, 0x24, /* SETMODE | PAL */
  97                 0xde, 0x02, /* EACTIVE */
  98
  99                 /* overlay colors */
 100                 0x70, 0xEB, 0x90, 0x80, 0xB0, 0x80, /* white */
 101                 0x72, 0xA2, 0x92, 0x8E, 0xB2, 0x2C, /* yellow */
 102                 0x74, 0x83, 0x94, 0x2C, 0xB4, 0x9C, /* cyan */
 103                 0x76, 0x70, 0x96, 0x3A, 0xB6, 0x48, /* green */
 104                 0x78, 0x54, 0x98, 0xC6, 0xB8, 0xB8, /* magenta */
 105                 0x7A, 0x41, 0x9A, 0xD4, 0xBA, 0x64, /* red */
 106                 0x7C, 0x23, 0x9C, 0x72, 0xBC, 0xD4, /* blue */
 107                 0x7E, 0x10, 0x9E, 0x80, 0xBE, 0x80, /* black */
 108
 109                 0x60, 0xEB, 0x80, 0x80, 0xc0, 0x80, /* white */
 110                 0x62, 0xA2, 0x82, 0x8E, 0xc2, 0x2C, /* yellow */
 111                 0x64, 0x83, 0x84, 0x2C, 0xc4, 0x9C, /* cyan */
 112                 0x66, 0x70, 0x86, 0x3A, 0xc6, 0x48, /* green */
 113                 0x68, 0x54, 0x88, 0xC6, 0xc8, 0xB8, /* magenta */
 114                 0x6A, 0x41, 0x8A, 0xD4, 0xcA, 0x64, /* red */
 115                 0x6C, 0x23, 0x8C, 0x72, 0xcC, 0xD4, /* blue */
 116                 0x6E, 0x10, 0x8E, 0x80, 0xcE, 0x80, /* black */
 117         };
 118         struct bt866 *encoder = to_bt866(sd);
 119         u8 val;
 120         int i;
 121
 122         for (i = 0; i < ARRAY_SIZE(init) / 2; i += 2)
 123                 bt866_write(encoder, init[i], init[i+1]);
 124
 125         val = encoder->reg[0xdc];
 126
 127         if (input == 0)
 128                 val |= 0x40; /* CBSWAP */
 129         else
 130                 val &= ~0x40; /* !CBSWAP */
 131
 132         bt866_write(encoder, 0xdc, val);
 133
 134         val = encoder->reg[0xcc];
 135         if (input == 2)
 136                 val |= 0x01; /* OSDBAR */
 137         else
 138                 val &= ~0x01; /* !OSDBAR */
 139         bt866_write(encoder, 0xcc, val);
 140
 141         v4l2_dbg(1, debug, sd, "set input %d\n", input);
 142
 143         switch (input) {
 144         case 0:
 145         case 1:
 146         case 2:
 147                 break;
 148         default:
 149                 return -EINVAL;
 150         }
 151         return 0;
 152 }
 153
 154 #if 0
 155 /* Code to setup square pixels, might be of some use in the future,
 156    but is currently unused. */
 157         val = encoder->reg[0xdc];
 158         if (*iarg)
 159                 val |= 1; /* SQUARE */
 160         else
 161                 val &= ~1; /* !SQUARE */
 162         bt866_write(client, 0xdc, val);
 163 #endif
 164
 165 /* ----------------------------------------------------------------------- */
 166
 167 static const struct v4l2_subdev_video_ops bt866_video_ops = {
 168         .s_std_output = bt866_s_std_output,
 169         .s_routing = bt866_s_routing,
 170 };
 171
 172 static const struct v4l2_subdev_ops bt866_ops = {
 173         .video = &bt866_video_ops,
 174 };
 175
 176 static int bt866_probe(struct i2c_client *client)
 177 {
 178         struct bt866 *encoder;
 179         struct v4l2_subdev *sd;
 180
 181         v4l_info(client, "chip found @ 0x%x (%s)\n",
 182                         client->addr << 1, client->adapter->name);
 183
 184         encoder = devm_kzalloc(&client->dev, sizeof(*encoder), GFP_KERNEL);
 185         if (encoder == NULL)
 186                 return -ENOMEM;
 187         sd = &encoder->sd;
 188         v4l2_i2c_subdev_init(sd, client, &bt866_ops);
 189         return 0;
 190 }
 191
 192 static void bt866_remove(struct i2c_client *client)
 193 {
 194         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 195
 196         v4l2_device_unregister_subdev(sd);
 197 }
 198
 199 static const struct i2c_device_id bt866_id[] = {
 200         { "bt866", 0 },
 201         { }
 202 };
 203 MODULE_DEVICE_TABLE(i2c, bt866_id);
 204
 205 static struct i2c_driver bt866_driver = {
 206         .driver = {
 207                 .name   = "bt866",
 208         },
 209         .probe          = bt866_probe,
 210         .remove         = bt866_remove,
 211         .id_table       = bt866_id,
 212 };
 213
 214 module_i2c_driver(bt866_driver);