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         int rc;
  72         u8 byte;
  73
  74         rc = i2c_master_recv(client, &byte, 1);
  75         if (rc != 1) {
  76                 v4l2_dbg(1, debug, sd,
  77                         "i2c_master_recv() failed\n");
  78                 if (rc < 0)
  79                         return rc;
  80                 return -EIO;
  81         }
  82
  83         if (byte & 0x80) {
  84                 v4l2_dbg(1, debug, sd,
  85                         "TDA9840_DETECT: register contents invalid\n");
  86                 return -EINVAL;
  87         }
  88
  89         v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
  90         return byte & 0x60;
  91 }
  92
  93 static int tda9840_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *t)
  94 {
  95         int stat = tda9840_status(sd);
  96         int byte;
  97
  98         if (t->index)
  99                 return -EINVAL;
 100
 101         stat = stat < 0 ? 0 : stat;
 102         if (stat == 0 || stat == 0x60) /* mono input */
 103                 byte = TDA9840_SET_MONO;
 104         else if (stat == 0x40) /* stereo input */
 105                 byte = (t->audmode == V4L2_TUNER_MODE_MONO) ?
 106                         TDA9840_SET_MONO : TDA9840_SET_STEREO;
 107         else { /* bilingual */
 108                 switch (t->audmode) {
 109                 case V4L2_TUNER_MODE_LANG1_LANG2:
 110                         byte = TDA9840_SET_BOTH;
 111                         break;
 112                 case V4L2_TUNER_MODE_LANG2:
 113                         byte = TDA9840_SET_LANG2;
 114                         break;
 115                 default:
 116                         byte = TDA9840_SET_LANG1;
 117                         break;
 118                 }
 119         }
 120         v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
 121         tda9840_write(sd, SWITCH, byte);
 122         return 0;
 123 }
 124
 125 static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
 126 {
 127         int stat = tda9840_status(sd);
 128
 129         if (stat < 0)
 130                 return stat;
 131
 132         t->rxsubchans = V4L2_TUNER_SUB_MONO;
 133
 134         switch (stat & 0x60) {
 135         case 0x00:
 136                 t->rxsubchans = V4L2_TUNER_SUB_MONO;
 137                 break;
 138         case 0x20:
 139                 t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
 140                 break;
 141         case 0x40:
 142                 t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
 143                 break;
 144         default: /* Incorrect detect */
 145                 t->rxsubchans = V4L2_TUNER_MODE_MONO;
 146                 break;
 147         }
 148         return 0;
 149 }
 150
 151 /* ----------------------------------------------------------------------- */
 152
 153 static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
 154         .s_tuner = tda9840_s_tuner,
 155         .g_tuner = tda9840_g_tuner,
 156 };
 157
 158 static const struct v4l2_subdev_ops tda9840_ops = {
 159         .tuner = &tda9840_tuner_ops,
 160 };
 161
 162 /* ----------------------------------------------------------------------- */
 163
 164 static int tda9840_probe(struct i2c_client *client,
 165                           const struct i2c_device_id *id)
 166 {
 167         struct v4l2_subdev *sd;
 168
 169         /* let's see whether this adapter can support what we need */
 170         if (!i2c_check_functionality(client->adapter,
 171                         I2C_FUNC_SMBUS_READ_BYTE_DATA |
 172                         I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
 173                 return -EIO;
 174
 175         v4l_info(client, "chip found @ 0x%x (%s)\n",
 176                         client->addr << 1, client->adapter->name);
 177
 178         sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
 179         if (sd == NULL)
 180                 return -ENOMEM;
 181         v4l2_i2c_subdev_init(sd, client, &tda9840_ops);
 182
 183         /* set initial values for level & stereo - adjustment, mode */
 184         tda9840_write(sd, LEVEL_ADJUST, 0);
 185         tda9840_write(sd, STEREO_ADJUST, 0);
 186         tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
 187         return 0;
 188 }
 189
 190 static int tda9840_remove(struct i2c_client *client)
 191 {
 192         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 193
 194         v4l2_device_unregister_subdev(sd);
 195         return 0;
 196 }
 197
 198 static const struct i2c_device_id tda9840_id[] = {
 199         { "tda9840", 0 },
 200         { }
 201 };
 202 MODULE_DEVICE_TABLE(i2c, tda9840_id);
 203
 204 static struct i2c_driver tda9840_driver = {
 205         .driver = {
 206                 .name   = "tda9840",
 207         },
 208         .probe          = tda9840_probe,
 209         .remove         = tda9840_remove,
 210         .id_table       = tda9840_id,
 211 };
 212
 213 module_i2c_driver(tda9840_driver);