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/slab.h>
  34 #include <linux/ioctl.h>
  35 #include <asm/uaccess.h>
  36 #include <linux/i2c.h>
  37 #include <linux/i2c-id.h>
  38 #include <linux/videodev2.h>
  39 #include <media/v4l2-device.h>
  40 #include <media/v4l2-chip-ident.h>
  41 #include <media/v4l2-i2c-drv.h>
  42
  43 MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
  44 MODULE_AUTHOR("Mike Bernson & Dave Perks");
  45 MODULE_LICENSE("GPL");
  46
  47 static int debug;
  48 module_param(debug, int, 0);
  49 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  50
  51
  52 /* ----------------------------------------------------------------------- */
  53
  54 #define BT856_REG_OFFSET        0xDA
  55 #define BT856_NR_REG            6
  56
  57 struct bt856 {
  58         struct v4l2_subdev sd;
  59         unsigned char reg[BT856_NR_REG];
  60
  61         v4l2_std_id norm;
  62 };
  63
  64 static inline struct bt856 *to_bt856(struct v4l2_subdev *sd)
  65 {
  66         return container_of(sd, struct bt856, sd);
  67 }
  68
  69 /* ----------------------------------------------------------------------- */
  70
  71 static inline int bt856_write(struct bt856 *encoder, u8 reg, u8 value)
  72 {
  73         struct i2c_client *client = v4l2_get_subdevdata(&encoder->sd);
  74
  75         encoder->reg[reg - BT856_REG_OFFSET] = value;
  76         return i2c_smbus_write_byte_data(client, reg, value);
  77 }
  78
  79 static inline int bt856_setbit(struct bt856 *encoder, u8 reg, u8 bit, u8 value)
  80 {
  81         return bt856_write(encoder, reg,
  82                 (encoder->reg[reg - BT856_REG_OFFSET] & ~(1 << bit)) |
  83                                 (value ? (1 << bit) : 0));
  84 }
  85
  86 static void bt856_dump(struct bt856 *encoder)
  87 {
  88         int i;
  89
  90         v4l2_info(&encoder->sd, "register dump:\n");
  91         for (i = 0; i < BT856_NR_REG; i += 2)
  92                 printk(KERN_CONT " %02x", encoder->reg[i]);
  93         printk(KERN_CONT "\n");
  94 }
  95
  96 /* ----------------------------------------------------------------------- */
  97
  98 static int bt856_init(struct v4l2_subdev *sd, u32 arg)
  99 {
 100         struct bt856 *encoder = to_bt856(sd);
 101
 102         /* This is just for testing!!! */
 103         v4l2_dbg(1, debug, sd, "init\n");
 104         bt856_write(encoder, 0xdc, 0x18);
 105         bt856_write(encoder, 0xda, 0);
 106         bt856_write(encoder, 0xde, 0);
 107
 108         bt856_setbit(encoder, 0xdc, 3, 1);
 109         /*bt856_setbit(encoder, 0xdc, 6, 0);*/
 110         bt856_setbit(encoder, 0xdc, 4, 1);
 111
 112         if (encoder->norm & V4L2_STD_NTSC)
 113                 bt856_setbit(encoder, 0xdc, 2, 0);
 114         else
 115                 bt856_setbit(encoder, 0xdc, 2, 1);
 116
 117         bt856_setbit(encoder, 0xdc, 1, 1);
 118         bt856_setbit(encoder, 0xde, 4, 0);
 119         bt856_setbit(encoder, 0xde, 3, 1);
 120         if (debug != 0)
 121                 bt856_dump(encoder);
 122         return 0;
 123 }
 124
 125 static int bt856_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
 126 {
 127         struct bt856 *encoder = to_bt856(sd);
 128
 129         v4l2_dbg(1, debug, sd, "set norm %llx\n", (unsigned long long)std);
 130
 131         if (std & V4L2_STD_NTSC) {
 132                 bt856_setbit(encoder, 0xdc, 2, 0);
 133         } else if (std & V4L2_STD_PAL) {
 134                 bt856_setbit(encoder, 0xdc, 2, 1);
 135                 bt856_setbit(encoder, 0xda, 0, 0);
 136                 /*bt856_setbit(encoder, 0xda, 0, 1);*/
 137         } else {
 138                 return -EINVAL;
 139         }
 140         encoder->norm = std;
 141         if (debug != 0)
 142                 bt856_dump(encoder);
 143         return 0;
 144 }
 145
 146 static int bt856_s_routing(struct v4l2_subdev *sd,
 147                            u32 input, u32 output, u32 config)
 148 {
 149         struct bt856 *encoder = to_bt856(sd);
 150
 151         v4l2_dbg(1, debug, sd, "set input %d\n", input);
 152
 153         /* We only have video bus.
 154          * input= 0: input is from bt819
 155          * input= 1: input is from ZR36060 */
 156         switch (input) {
 157         case 0:
 158                 bt856_setbit(encoder, 0xde, 4, 0);
 159                 bt856_setbit(encoder, 0xde, 3, 1);
 160                 bt856_setbit(encoder, 0xdc, 3, 1);
 161                 bt856_setbit(encoder, 0xdc, 6, 0);
 162                 break;
 163         case 1:
 164                 bt856_setbit(encoder, 0xde, 4, 0);
 165                 bt856_setbit(encoder, 0xde, 3, 1);
 166                 bt856_setbit(encoder, 0xdc, 3, 1);
 167                 bt856_setbit(encoder, 0xdc, 6, 1);
 168                 break;
 169         case 2: /* Color bar */
 170                 bt856_setbit(encoder, 0xdc, 3, 0);
 171                 bt856_setbit(encoder, 0xde, 4, 1);
 172                 break;
 173         default:
 174                 return -EINVAL;
 175         }
 176
 177         if (debug != 0)
 178                 bt856_dump(encoder);
 179         return 0;
 180 }
 181
 182 static int bt856_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 183 {
 184         struct i2c_client *client = v4l2_get_subdevdata(sd);
 185
 186         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_BT856, 0);
 187 }
 188
 189 /* ----------------------------------------------------------------------- */
 190
 191 static const struct v4l2_subdev_core_ops bt856_core_ops = {
 192         .g_chip_ident = bt856_g_chip_ident,
 193         .init = bt856_init,
 194 };
 195
 196 static const struct v4l2_subdev_video_ops bt856_video_ops = {
 197         .s_std_output = bt856_s_std_output,
 198         .s_routing = bt856_s_routing,
 199 };
 200
 201 static const struct v4l2_subdev_ops bt856_ops = {
 202         .core = &bt856_core_ops,
 203         .video = &bt856_video_ops,
 204 };
 205
 206 /* ----------------------------------------------------------------------- */
 207
 208 static int bt856_probe(struct i2c_client *client,
 209                         const struct i2c_device_id *id)
 210 {
 211         struct bt856 *encoder;
 212         struct v4l2_subdev *sd;
 213
 214         /* Check if the adapter supports the needed features */
 215         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 216                 return -ENODEV;
 217
 218         v4l_info(client, "chip found @ 0x%x (%s)\n",
 219                         client->addr << 1, client->adapter->name);
 220
 221         encoder = kzalloc(sizeof(struct bt856), GFP_KERNEL);
 222         if (encoder == NULL)
 223                 return -ENOMEM;
 224         sd = &encoder->sd;
 225         v4l2_i2c_subdev_init(sd, client, &bt856_ops);
 226         encoder->norm = V4L2_STD_NTSC;
 227
 228         bt856_write(encoder, 0xdc, 0x18);
 229         bt856_write(encoder, 0xda, 0);
 230         bt856_write(encoder, 0xde, 0);
 231
 232         bt856_setbit(encoder, 0xdc, 3, 1);
 233         /*bt856_setbit(encoder, 0xdc, 6, 0);*/
 234         bt856_setbit(encoder, 0xdc, 4, 1);
 235
 236         if (encoder->norm & V4L2_STD_NTSC)
 237                 bt856_setbit(encoder, 0xdc, 2, 0);
 238         else
 239                 bt856_setbit(encoder, 0xdc, 2, 1);
 240
 241         bt856_setbit(encoder, 0xdc, 1, 1);
 242         bt856_setbit(encoder, 0xde, 4, 0);
 243         bt856_setbit(encoder, 0xde, 3, 1);
 244
 245         if (debug != 0)
 246                 bt856_dump(encoder);
 247         return 0;
 248 }
 249
 250 static int bt856_remove(struct i2c_client *client)
 251 {
 252         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 253
 254         v4l2_device_unregister_subdev(sd);
 255         kfree(to_bt856(sd));
 256         return 0;
 257 }
 258
 259 static const struct i2c_device_id bt856_id[] = {
 260         { "bt856", 0 },
 261         { }
 262 };
 263 MODULE_DEVICE_TABLE(i2c, bt856_id);
 264
 265 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 266         .name = "bt856",
 267         .probe = bt856_probe,
 268         .remove = bt856_remove,
 269         .id_table = bt856_id,
 270 };