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
  35 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
  36 MODULE_DESCRIPTION("tda9840 driver");
  37 MODULE_LICENSE("GPL");
  38
  39 static int debug;
  40 module_param(debug, int, 0644);
  41
  42 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  43
  44 #define SWITCH          0x00
  45 #define LEVEL_ADJUST    0x02
  46 #define STEREO_ADJUST   0x03
  47 #define TEST            0x04
  48
  49 #define TDA9840_SET_MUTE                0x00
  50 #define TDA9840_SET_MONO                0x10
  51 #define TDA9840_SET_STEREO              0x2a
  52 #define TDA9840_SET_LANG1               0x12
  53 #define TDA9840_SET_LANG2               0x1e
  54 #define TDA9840_SET_BOTH                0x1a
  55 #define TDA9840_SET_BOTH_R              0x16
  56 #define TDA9840_SET_EXTERNAL            0x7a
  57
  58
  59 static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val)
  60 {
  61         struct i2c_client *client = v4l2_get_subdevdata(sd);
  62
  63         if (i2c_smbus_write_byte_data(client, reg, val))
  64                 v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n",
  65                                 val, reg);
  66 }
  67
  68 static int tda9840_status(struct v4l2_subdev *sd)
  69 {
  70         struct i2c_client *client = v4l2_get_subdevdata(sd);
  71         u8 byte;
  72
  73         if (1 != i2c_master_recv(client, &byte, 1)) {
  74                 v4l2_dbg(1, debug, sd,
  75                         "i2c_master_recv() failed\n");
  76                 return -EIO;
  77         }
  78
  79         if (byte & 0x80) {
  80                 v4l2_dbg(1, debug, sd,
  81                         "TDA9840_DETECT: register contents invalid\n");
  82                 return -EINVAL;
  83         }
  84
  85         v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
  86         return byte & 0x60;
  87 }
  88
  89 static int tda9840_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *t)
  90 {
  91         int stat = tda9840_status(sd);
  92         int byte;
  93
  94         if (t->index)
  95                 return -EINVAL;
  96
  97         stat = stat < 0 ? 0 : stat;
  98         if (stat == 0 || stat == 0x60) /* mono input */
  99                 byte = TDA9840_SET_MONO;
 100         else if (stat == 0x40) /* stereo input */
 101                 byte = (t->audmode == V4L2_TUNER_MODE_MONO) ?
 102                         TDA9840_SET_MONO : TDA9840_SET_STEREO;
 103         else { /* bilingual */
 104                 switch (t->audmode) {
 105                 case V4L2_TUNER_MODE_LANG1_LANG2:
 106                         byte = TDA9840_SET_BOTH;
 107                         break;
 108                 case V4L2_TUNER_MODE_LANG2:
 109                         byte = TDA9840_SET_LANG2;
 110                         break;
 111                 default:
 112                         byte = TDA9840_SET_LANG1;
 113                         break;
 114                 }
 115         }
 116         v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
 117         tda9840_write(sd, SWITCH, byte);
 118         return 0;
 119 }
 120
 121 static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
 122 {
 123         int stat = tda9840_status(sd);
 124
 125         if (stat < 0)
 126                 return stat;
 127
 128         t->rxsubchans = V4L2_TUNER_SUB_MONO;
 129
 130         switch (stat & 0x60) {
 131         case 0x00:
 132                 t->rxsubchans = V4L2_TUNER_SUB_MONO;
 133                 break;
 134         case 0x20:
 135                 t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
 136                 break;
 137         case 0x40:
 138                 t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
 139                 break;
 140         default: /* Incorrect detect */
 141                 t->rxsubchans = V4L2_TUNER_MODE_MONO;
 142                 break;
 143         }
 144         return 0;
 145 }
 146
 147 /* ----------------------------------------------------------------------- */
 148
 149 static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
 150         .s_tuner = tda9840_s_tuner,
 151         .g_tuner = tda9840_g_tuner,
 152 };
 153
 154 static const struct v4l2_subdev_ops tda9840_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 = devm_kzalloc(&client->dev, sizeof(*sd), 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         return 0;
 192 }
 193
 194 static const struct i2c_device_id tda9840_id[] = {
 195         { "tda9840", 0 },
 196         { }
 197 };
 198 MODULE_DEVICE_TABLE(i2c, tda9840_id);
 199
 200 static struct i2c_driver tda9840_driver = {
 201         .driver = {
 202                 .name   = "tda9840",
 203         },
 204         .probe          = tda9840_probe,
 205         .remove         = tda9840_remove,
 206         .id_table       = tda9840_id,
 207 };
 208
 209 module_i2c_driver(tda9840_driver);