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/i2c.h>
  32 #include <media/v4l2-common.h>
  33 #include <media/v4l2-i2c-drv-legacy.h>
  34 #include "tda9840.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 /* addresses to scan, found only at 0x42 (7-Bit) */
  60 static unsigned short normal_i2c[] = { I2C_ADDR_TDA9840, I2C_CLIENT_END };
  61
  62 /* magic definition of all other variables and things */
  63 I2C_CLIENT_INSMOD;
  64
  65 static void tda9840_write(struct i2c_client *client, u8 reg, u8 val)
  66 {
  67         if (i2c_smbus_write_byte_data(client, reg, val))
  68                 v4l_dbg(1, debug, client, "error writing %02x to %02x\n",
  69                                 val, reg);
  70 }
  71
  72 static int tda9840_command(struct i2c_client *client, unsigned cmd, void *arg)
  73 {
  74         int result = 0;
  75         int byte = *(int *)arg;
  76
  77         switch (cmd) {
  78         case VIDIOC_S_TUNER: {
  79                 struct v4l2_tuner *t = arg;
  80                 int byte;
  81
  82                 if (t->index)
  83                         return -EINVAL;
  84
  85                 switch (t->audmode) {
  86                 case V4L2_TUNER_MODE_STEREO:
  87                         byte = TDA9840_SET_STEREO;
  88                         break;
  89                 case V4L2_TUNER_MODE_LANG1_LANG2:
  90                         byte = TDA9840_SET_BOTH;
  91                         break;
  92                 case V4L2_TUNER_MODE_LANG1:
  93                         byte = TDA9840_SET_LANG1;
  94                         break;
  95                 case V4L2_TUNER_MODE_LANG2:
  96                         byte = TDA9840_SET_LANG2;
  97                         break;
  98                 default:
  99                         byte = TDA9840_SET_MONO;
 100                         break;
 101                 }
 102                 v4l_dbg(1, debug, client, "TDA9840_SWITCH: 0x%02x\n", byte);
 103                 tda9840_write(client, SWITCH, byte);
 104                 break;
 105         }
 106
 107         case VIDIOC_G_TUNER: {
 108                 struct v4l2_tuner *t = arg;
 109                 u8 byte;
 110
 111                 t->rxsubchans = V4L2_TUNER_SUB_MONO;
 112                 if (1 != i2c_master_recv(client, &byte, 1)) {
 113                         v4l_dbg(1, debug, client,
 114                                 "i2c_master_recv() failed\n");
 115                         return -EIO;
 116                 }
 117
 118                 if (byte & 0x80) {
 119                         v4l_dbg(1, debug, client,
 120                                 "TDA9840_DETECT: register contents invalid\n");
 121                         return -EINVAL;
 122                 }
 123
 124                 v4l_dbg(1, debug, client, "TDA9840_DETECT: byte: 0x%02x\n", byte);
 125
 126                 switch (byte & 0x60) {
 127                 case 0x00:
 128                         t->rxsubchans = V4L2_TUNER_SUB_MONO;
 129                         break;
 130                 case 0x20:
 131                         t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
 132                         break;
 133                 case 0x40:
 134                         t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
 135                         break;
 136                 default: /* Incorrect detect */
 137                         t->rxsubchans = V4L2_TUNER_MODE_MONO;
 138                         break;
 139                 }
 140                 break;
 141         }
 142
 143         case TDA9840_LEVEL_ADJUST:
 144                 v4l_dbg(1, debug, client, "TDA9840_LEVEL_ADJUST: %d\n", byte);
 145
 146                 /* check for correct range */
 147                 if (byte > 25 || byte < -20)
 148                         return -EINVAL;
 149
 150                 /* calculate actual value to set, see specs, page 18 */
 151                 byte /= 5;
 152                 if (0 < byte)
 153                         byte += 0x8;
 154                 else
 155                         byte = -byte;
 156                 tda9840_write(client, LEVEL_ADJUST, byte);
 157                 break;
 158
 159         case TDA9840_STEREO_ADJUST:
 160                 v4l_dbg(1, debug, client, "TDA9840_STEREO_ADJUST: %d\n", byte);
 161
 162                 /* check for correct range */
 163                 if (byte > 25 || byte < -24)
 164                         return -EINVAL;
 165
 166                 /* calculate actual value to set */
 167                 byte /= 5;
 168                 if (0 < byte)
 169                         byte += 0x20;
 170                 else
 171                         byte = -byte;
 172
 173                 tda9840_write(client, STEREO_ADJUST, byte);
 174                 break;
 175         default:
 176                 return -ENOIOCTLCMD;
 177         }
 178
 179         if (result)
 180                 return -EIO;
 181
 182         return 0;
 183 }
 184
 185 static int tda9840_probe(struct i2c_client *client,
 186                           const struct i2c_device_id *id)
 187 {
 188         int result;
 189         int byte;
 190
 191         /* let's see whether this adapter can support what we need */
 192         if (!i2c_check_functionality(client->adapter,
 193                         I2C_FUNC_SMBUS_READ_BYTE_DATA |
 194                         I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
 195                 return 0;
 196
 197         v4l_info(client, "chip found @ 0x%x (%s)\n",
 198                         client->addr << 1, client->adapter->name);
 199
 200         /* set initial values for level & stereo - adjustment, mode */
 201         byte = 0;
 202         result = tda9840_command(client, TDA9840_LEVEL_ADJUST, &byte);
 203         result += tda9840_command(client, TDA9840_STEREO_ADJUST, &byte);
 204         tda9840_write(client, SWITCH, TDA9840_SET_STEREO);
 205         if (result) {
 206                 v4l_dbg(1, debug, client, "could not initialize tda9840\n");
 207                 return -ENODEV;
 208         }
 209         return 0;
 210 }
 211
 212 static int tda9840_legacy_probe(struct i2c_adapter *adapter)
 213 {
 214         /* Let's see whether this is a known adapter we can attach to.
 215            Prevents conflicts with tvaudio.c. */
 216         return adapter->id == I2C_HW_SAA7146;
 217 }
 218 static const struct i2c_device_id tda9840_id[] = {
 219         { "tda9840", 0 },
 220         { }
 221 };
 222 MODULE_DEVICE_TABLE(i2c, tda9840_id);
 223
 224 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 225         .name = "tda9840",
 226         .driverid = I2C_DRIVERID_TDA9840,
 227         .command = tda9840_command,
 228         .probe = tda9840_probe,
 229         .legacy_probe = tda9840_legacy_probe,
 230         .id_table = tda9840_id,
 231 };