drivers/media/video/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_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
  70 {
  71         int byte;
  72
  73         if (t->index)
  74                 return -EINVAL;
  75
  76         switch (t->audmode) {
  77         case V4L2_TUNER_MODE_STEREO:
  78                 byte = TDA9840_SET_STEREO;
  79                 break;
  80         case V4L2_TUNER_MODE_LANG1_LANG2:
  81                 byte = TDA9840_SET_BOTH;
  82                 break;
  83         case V4L2_TUNER_MODE_LANG1:
  84                 byte = TDA9840_SET_LANG1;
  85                 break;
  86         case V4L2_TUNER_MODE_LANG2:
  87                 byte = TDA9840_SET_LANG2;
  88                 break;
  89         default:
  90                 byte = TDA9840_SET_MONO;
  91                 break;
  92         }
  93         v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
  94         tda9840_write(sd, SWITCH, byte);
  95         return 0;
  96 }
  97
  98 static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
  99 {
 100         struct i2c_client *client = v4l2_get_subdevdata(sd);
 101         u8 byte;
 102
 103         t->rxsubchans = V4L2_TUNER_SUB_MONO;
 104         if (1 != i2c_master_recv(client, &byte, 1)) {
 105                 v4l2_dbg(1, debug, sd,
 106                         "i2c_master_recv() failed\n");
 107                 return -EIO;
 108         }
 109
 110         if (byte & 0x80) {
 111                 v4l2_dbg(1, debug, sd,
 112                         "TDA9840_DETECT: register contents invalid\n");
 113                 return -EINVAL;
 114         }
 115
 116         v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
 117
 118         switch (byte & 0x60) {
 119         case 0x00:
 120                 t->rxsubchans = V4L2_TUNER_SUB_MONO;
 121                 break;
 122         case 0x20:
 123                 t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
 124                 break;
 125         case 0x40:
 126                 t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
 127                 break;
 128         default: /* Incorrect detect */
 129                 t->rxsubchans = V4L2_TUNER_MODE_MONO;
 130                 break;
 131         }
 132         return 0;
 133 }
 134
 135 static int tda9840_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 136 {
 137         struct i2c_client *client = v4l2_get_subdevdata(sd);
 138
 139         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TDA9840, 0);
 140 }
 141
 142 /* ----------------------------------------------------------------------- */
 143
 144 static const struct v4l2_subdev_core_ops tda9840_core_ops = {
 145         .g_chip_ident = tda9840_g_chip_ident,
 146 };
 147
 148 static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
 149         .s_tuner = tda9840_s_tuner,
 150         .g_tuner = tda9840_g_tuner,
 151 };
 152
 153 static const struct v4l2_subdev_ops tda9840_ops = {
 154         .core = &tda9840_core_ops,
 155         .tuner = &tda9840_tuner_ops,
 156 };
 157
 158 /* ----------------------------------------------------------------------- */
 159
 160 static int tda9840_probe(struct i2c_client *client,
 161                           const struct i2c_device_id *id)
 162 {
 163         struct v4l2_subdev *sd;
 164
 165         /* let's see whether this adapter can support what we need */
 166         if (!i2c_check_functionality(client->adapter,
 167                         I2C_FUNC_SMBUS_READ_BYTE_DATA |
 168                         I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
 169                 return -EIO;
 170
 171         v4l_info(client, "chip found @ 0x%x (%s)\n",
 172                         client->addr << 1, client->adapter->name);
 173
 174         sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
 175         if (sd == NULL)
 176                 return -ENOMEM;
 177         v4l2_i2c_subdev_init(sd, client, &tda9840_ops);
 178
 179         /* set initial values for level & stereo - adjustment, mode */
 180         tda9840_write(sd, LEVEL_ADJUST, 0);
 181         tda9840_write(sd, STEREO_ADJUST, 0);
 182         tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
 183         return 0;
 184 }
 185
 186 static int tda9840_remove(struct i2c_client *client)
 187 {
 188         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 189
 190         v4l2_device_unregister_subdev(sd);
 191         kfree(sd);
 192         return 0;
 193 }
 194
 195 static const struct i2c_device_id tda9840_id[] = {
 196         { "tda9840", 0 },
 197         { }
 198 };
 199 MODULE_DEVICE_TABLE(i2c, tda9840_id);
 200
 201 static struct i2c_driver tda9840_driver = {
 202         .driver = {
 203                 .owner  = THIS_MODULE,
 204                 .name   = "tda9840",
 205         },
 206         .probe          = tda9840_probe,
 207         .remove         = tda9840_remove,
 208         .id_table       = tda9840_id,
 209 };
 210
 211 static __init int init_tda9840(void)
 212 {
 213         return i2c_add_driver(&tda9840_driver);
 214 }
 215
 216 static __exit void exit_tda9840(void)
 217 {
 218         i2c_del_driver(&tda9840_driver);
 219 }
 220
 221 module_init(init_tda9840);
 222 module_exit(exit_tda9840);