drivers/media/i2c/tda9840.c

   1  /*
   2     tda9840 - i2c-driver for the tda9840 by SGS Thomson
   3
   4     Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
   5     Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
   6
   7     The tda9840 is a stereo/dual sound processor with digital
   8     identification. It can be found at address 0x84 on the i2c-bus.
   9
  10     For detailed informations download the specifications directly
  11     from SGS Thomson at http://www.st.com
  12
  13     This program is free software; you can redistribute it and/or modify
  14     it under the terms of the GNU General Public License as published by
  15     the Free Software Foundation; either version 2 of the License, or
  16     (at your option) any later version.
  17
  18     This program is distributed in the hope that it will be useful,
  19     but WITHOUT ANY WARRANTY; without even the implied warranty of
  20     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21     GNU General Public License for more details.
  22
  23     You should have received a copy of the GNU General Public License
  24     along with this program; if not, write to the Free Software
  25     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26   */
  27
  28
  29 #include <linux/module.h>
  30 #include <linux/ioctl.h>
  31 #include <linux/slab.h>
  32 #include <linux/i2c.h>
  33 #include <media/v4l2-device.h>
  34 #include <media/v4l2-chip-ident.h>
  35
  36 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
  37 MODULE_DESCRIPTION("tda9840 driver");
  38 MODULE_LICENSE("GPL");
  39
  40 static int debug;
  41 module_param(debug, int, 0644);
  42
  43 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  44
  45 #define SWITCH          0x00
  46 #define LEVEL_ADJUST    0x02
  47 #define STEREO_ADJUST   0x03
  48 #define TEST            0x04
  49
  50 #define TDA9840_SET_MUTE                0x00
  51 #define TDA9840_SET_MONO                0x10
  52 #define TDA9840_SET_STEREO              0x2a
  53 #define TDA9840_SET_LANG1               0x12
  54 #define TDA9840_SET_LANG2               0x1e
  55 #define TDA9840_SET_BOTH                0x1a
  56 #define TDA9840_SET_BOTH_R              0x16
  57 #define TDA9840_SET_EXTERNAL            0x7a
  58
  59
  60 static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val)
  61 {
  62         struct i2c_client *client = v4l2_get_subdevdata(sd);
  63
  64         if (i2c_smbus_write_byte_data(client, reg, val))
  65                 v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n",
  66                                 val, reg);
  67 }
  68
  69 static int tda9840_status(struct v4l2_subdev *sd)
  70 {
  71         struct i2c_client *client = v4l2_get_subdevdata(sd);
  72         u8 byte;
  73
  74         if (1 != i2c_master_recv(client, &byte, 1)) {
  75                 v4l2_dbg(1, debug, sd,
  76                         "i2c_master_recv() failed\n");
  77                 return -EIO;
  78         }
  79
  80         if (byte & 0x80) {
  81                 v4l2_dbg(1, debug, sd,
  82                         "TDA9840_DETECT: register contents invalid\n");
  83                 return -EINVAL;
  84         }
  85
  86         v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
  87         return byte & 0x60;
  88 }
  89
  90 static int tda9840_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
  91 {
  92         int stat = tda9840_status(sd);
  93         int byte;
  94
  95         if (t->index)
  96                 return -EINVAL;
  97
  98         stat = stat < 0 ? 0 : stat;
  99         if (stat == 0 || stat == 0x60) /* mono input */
 100                 byte = TDA9840_SET_MONO;
 101         else if (stat == 0x40) /* stereo input */
 102                 byte = (t->audmode == V4L2_TUNER_MODE_MONO) ?
 103                         TDA9840_SET_MONO : TDA9840_SET_STEREO;
 104         else { /* bilingual */
 105                 switch (t->audmode) {
 106                 case V4L2_TUNER_MODE_LANG1_LANG2:
 107                         byte = TDA9840_SET_BOTH;
 108                         break;
 109                 case V4L2_TUNER_MODE_LANG2:
 110                         byte = TDA9840_SET_LANG2;
 111                         break;
 112                 default:
 113                         byte = TDA9840_SET_LANG1;
 114                         break;
 115                 }
 116         }
 117         v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
 118         tda9840_write(sd, SWITCH, byte);
 119         return 0;
 120 }
 121
 122 static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
 123 {
 124         int stat = tda9840_status(sd);
 125
 126         if (stat < 0)
 127                 return stat;
 128
 129         t->rxsubchans = V4L2_TUNER_SUB_MONO;
 130
 131         switch (stat & 0x60) {
 132         case 0x00:
 133                 t->rxsubchans = V4L2_TUNER_SUB_MONO;
 134                 break;
 135         case 0x20:
 136                 t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
 137                 break;
 138         case 0x40:
 139                 t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
 140                 break;
 141         default: /* Incorrect detect */
 142                 t->rxsubchans = V4L2_TUNER_MODE_MONO;
 143                 break;
 144         }
 145         return 0;
 146 }
 147
 148 static int tda9840_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 149 {
 150         struct i2c_client *client = v4l2_get_subdevdata(sd);
 151
 152         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TDA9840, 0);
 153 }
 154
 155 /* ----------------------------------------------------------------------- */
 156
 157 static const struct v4l2_subdev_core_ops tda9840_core_ops = {
 158         .g_chip_ident = tda9840_g_chip_ident,
 159 };
 160
 161 static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
 162         .s_tuner = tda9840_s_tuner,
 163         .g_tuner = tda9840_g_tuner,
 164 };
 165
 166 static const struct v4l2_subdev_ops tda9840_ops = {
 167         .core = &tda9840_core_ops,
 168         .tuner = &tda9840_tuner_ops,
 169 };
 170
 171 /* ----------------------------------------------------------------------- */
 172
 173 static int tda9840_probe(struct i2c_client *client,
 174                           const struct i2c_device_id *id)
 175 {
 176         struct v4l2_subdev *sd;
 177
 178         /* let's see whether this adapter can support what we need */
 179         if (!i2c_check_functionality(client->adapter,
 180                         I2C_FUNC_SMBUS_READ_BYTE_DATA |
 181                         I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
 182                 return -EIO;
 183
 184         v4l_info(client, "chip found @ 0x%x (%s)\n",
 185                         client->addr << 1, client->adapter->name);
 186
 187         sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
 188         if (sd == NULL)
 189                 return -ENOMEM;
 190         v4l2_i2c_subdev_init(sd, client, &tda9840_ops);
 191
 192         /* set initial values for level & stereo - adjustment, mode */
 193         tda9840_write(sd, LEVEL_ADJUST, 0);
 194         tda9840_write(sd, STEREO_ADJUST, 0);
 195         tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
 196         return 0;
 197 }
 198
 199 static int tda9840_remove(struct i2c_client *client)
 200 {
 201         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 202
 203         v4l2_device_unregister_subdev(sd);
 204         kfree(sd);
 205         return 0;
 206 }
 207
 208 static const struct i2c_device_id tda9840_id[] = {
 209         { "tda9840", 0 },
 210         { }
 211 };
 212 MODULE_DEVICE_TABLE(i2c, tda9840_id);
 213
 214 static struct i2c_driver tda9840_driver = {
 215         .driver = {
 216                 .owner  = THIS_MODULE,
 217                 .name   = "tda9840",
 218         },
 219         .probe          = tda9840_probe,
 220         .remove         = tda9840_remove,
 221         .id_table       = tda9840_id,
 222 };
 223
 224 module_i2c_driver(tda9840_driver);