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/videodev2.h>
  38 #include <media/v4l2-device.h>
  39 #include <media/v4l2-chip-ident.h>
  40 #include <media/v4l2-i2c-drv.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
  53 #define BT856_REG_OFFSET        0xDA
  54 #define BT856_NR_REG            6
  55
  56 struct bt856 {
  57         struct v4l2_subdev sd;
  58         unsigned char reg[BT856_NR_REG];
  59
  60         v4l2_std_id norm;
  61 };
  62
  63 static inline struct bt856 *to_bt856(struct v4l2_subdev *sd)
  64 {
  65         return container_of(sd, struct bt856, sd);
  66 }
  67
  68 /* ----------------------------------------------------------------------- */
  69
  70 static inline int bt856_write(struct bt856 *encoder, u8 reg, u8 value)
  71 {
  72         struct i2c_client *client = v4l2_get_subdevdata(&encoder->sd);
  73
  74         encoder->reg[reg - BT856_REG_OFFSET] = value;
  75         return i2c_smbus_write_byte_data(client, reg, value);
  76 }
  77
  78 static inline int bt856_setbit(struct bt856 *encoder, u8 reg, u8 bit, u8 value)
  79 {
  80         return bt856_write(encoder, reg,
  81                 (encoder->reg[reg - BT856_REG_OFFSET] & ~(1 << bit)) |
  82                                 (value ? (1 << bit) : 0));
  83 }
  84
  85 static void bt856_dump(struct bt856 *encoder)
  86 {
  87         int i;
  88
  89         v4l2_info(&encoder->sd, "register dump:\n");
  90         for (i = 0; i < BT856_NR_REG; i += 2)
  91                 printk(KERN_CONT " %02x", encoder->reg[i]);
  92         printk(KERN_CONT "\n");
  93 }
  94
  95 /* ----------------------------------------------------------------------- */
  96
  97 static int bt856_init(struct v4l2_subdev *sd, u32 arg)
  98 {
  99         struct bt856 *encoder = to_bt856(sd);
 100
 101         /* This is just for testing!!! */
 102         v4l2_dbg(1, debug, sd, "init\n");
 103         bt856_write(encoder, 0xdc, 0x18);
 104         bt856_write(encoder, 0xda, 0);
 105         bt856_write(encoder, 0xde, 0);
 106
 107         bt856_setbit(encoder, 0xdc, 3, 1);
 108         /*bt856_setbit(encoder, 0xdc, 6, 0);*/
 109         bt856_setbit(encoder, 0xdc, 4, 1);
 110
 111         if (encoder->norm & V4L2_STD_NTSC)
 112                 bt856_setbit(encoder, 0xdc, 2, 0);
 113         else
 114                 bt856_setbit(encoder, 0xdc, 2, 1);
 115
 116         bt856_setbit(encoder, 0xdc, 1, 1);
 117         bt856_setbit(encoder, 0xde, 4, 0);
 118         bt856_setbit(encoder, 0xde, 3, 1);
 119         if (debug != 0)
 120                 bt856_dump(encoder);
 121         return 0;
 122 }
 123
 124 static int bt856_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
 125 {
 126         struct bt856 *encoder = to_bt856(sd);
 127
 128         v4l2_dbg(1, debug, sd, "set norm %llx\n", std);
 129
 130         if (std & V4L2_STD_NTSC) {
 131                 bt856_setbit(encoder, 0xdc, 2, 0);
 132         } else if (std & V4L2_STD_PAL) {
 133                 bt856_setbit(encoder, 0xdc, 2, 1);
 134                 bt856_setbit(encoder, 0xda, 0, 0);
 135                 /*bt856_setbit(encoder, 0xda, 0, 1);*/
 136         } else {
 137                 return -EINVAL;
 138         }
 139         encoder->norm = std;
 140         if (debug != 0)
 141                 bt856_dump(encoder);
 142         return 0;
 143 }
 144
 145 static int bt856_s_routing(struct v4l2_subdev *sd, const struct v4l2_routing *route)
 146 {
 147         struct bt856 *encoder = to_bt856(sd);
 148
 149         v4l2_dbg(1, debug, sd, "set input %d\n", route->input);
 150
 151         /* We only have video bus.
 152          * route->input= 0: input is from bt819
 153          * route->input= 1: input is from ZR36060 */
 154         switch (route->input) {
 155         case 0:
 156                 bt856_setbit(encoder, 0xde, 4, 0);
 157                 bt856_setbit(encoder, 0xde, 3, 1);
 158                 bt856_setbit(encoder, 0xdc, 3, 1);
 159                 bt856_setbit(encoder, 0xdc, 6, 0);
 160                 break;
 161         case 1:
 162                 bt856_setbit(encoder, 0xde, 4, 0);
 163                 bt856_setbit(encoder, 0xde, 3, 1);
 164                 bt856_setbit(encoder, 0xdc, 3, 1);
 165                 bt856_setbit(encoder, 0xdc, 6, 1);
 166                 break;
 167         case 2: /* Color bar */
 168                 bt856_setbit(encoder, 0xdc, 3, 0);
 169                 bt856_setbit(encoder, 0xde, 4, 1);
 170                 break;
 171         default:
 172                 return -EINVAL;
 173         }
 174
 175         if (debug != 0)
 176                 bt856_dump(encoder);
 177         return 0;
 178 }
 179
 180 static int bt856_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 181 {
 182         struct i2c_client *client = v4l2_get_subdevdata(sd);
 183
 184         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_BT856, 0);
 185 }
 186
 187 /* ----------------------------------------------------------------------- */
 188
 189 static const struct v4l2_subdev_core_ops bt856_core_ops = {
 190         .g_chip_ident = bt856_g_chip_ident,
 191         .init = bt856_init,
 192 };
 193
 194 static const struct v4l2_subdev_video_ops bt856_video_ops = {
 195         .s_std_output = bt856_s_std_output,
 196         .s_routing = bt856_s_routing,
 197 };
 198
 199 static const struct v4l2_subdev_ops bt856_ops = {
 200         .core = &bt856_core_ops,
 201         .video = &bt856_video_ops,
 202 };
 203
 204 /* ----------------------------------------------------------------------- */
 205
 206 static int bt856_probe(struct i2c_client *client,
 207                         const struct i2c_device_id *id)
 208 {
 209         struct bt856 *encoder;
 210         struct v4l2_subdev *sd;
 211
 212         /* Check if the adapter supports the needed features */
 213         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 214                 return -ENODEV;
 215
 216         v4l_info(client, "chip found @ 0x%x (%s)\n",
 217                         client->addr << 1, client->adapter->name);
 218
 219         encoder = kzalloc(sizeof(struct bt856), GFP_KERNEL);
 220         if (encoder == NULL)
 221                 return -ENOMEM;
 222         sd = &encoder->sd;
 223         v4l2_i2c_subdev_init(sd, client, &bt856_ops);
 224         encoder->norm = V4L2_STD_NTSC;
 225
 226         bt856_write(encoder, 0xdc, 0x18);
 227         bt856_write(encoder, 0xda, 0);
 228         bt856_write(encoder, 0xde, 0);
 229
 230         bt856_setbit(encoder, 0xdc, 3, 1);
 231         /*bt856_setbit(encoder, 0xdc, 6, 0);*/
 232         bt856_setbit(encoder, 0xdc, 4, 1);
 233
 234         if (encoder->norm & V4L2_STD_NTSC)
 235                 bt856_setbit(encoder, 0xdc, 2, 0);
 236         else
 237                 bt856_setbit(encoder, 0xdc, 2, 1);
 238
 239         bt856_setbit(encoder, 0xdc, 1, 1);
 240         bt856_setbit(encoder, 0xde, 4, 0);
 241         bt856_setbit(encoder, 0xde, 3, 1);
 242
 243         if (debug != 0)
 244                 bt856_dump(encoder);
 245         return 0;
 246 }
 247
 248 static int bt856_remove(struct i2c_client *client)
 249 {
 250         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 251
 252         v4l2_device_unregister_subdev(sd);
 253         kfree(to_bt856(sd));
 254         return 0;
 255 }
 256
 257 static const struct i2c_device_id bt856_id[] = {
 258         { "bt856", 0 },
 259         { }
 260 };
 261 MODULE_DEVICE_TABLE(i2c, bt856_id);
 262
 263 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 264         .name = "bt856",
 265         .probe = bt856_probe,
 266         .remove = bt856_remove,
 267         .id_table = bt856_id,
 268 };