git.oblomov.eu Git - linux-2.6/blob - 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 byte = *(int *)arg;
  75
  76         switch (cmd) {
  77         case VIDIOC_S_TUNER: {
  78                 struct v4l2_tuner *t = arg;
  79                 int byte;
  80
  81                 if (t->index)
  82                         return -EINVAL;
  83
  84                 switch (t->audmode) {
  85                 case V4L2_TUNER_MODE_STEREO:
  86                         byte = TDA9840_SET_STEREO;
  87                         break;
  88                 case V4L2_TUNER_MODE_LANG1_LANG2:
  89                         byte = TDA9840_SET_BOTH;
  90                         break;
  91                 case V4L2_TUNER_MODE_LANG1:
  92                         byte = TDA9840_SET_LANG1;
  93                         break;
  94                 case V4L2_TUNER_MODE_LANG2:
  95                         byte = TDA9840_SET_LANG2;
  96                         break;
  97                 default:
  98                         byte = TDA9840_SET_MONO;
  99                         break;
 100                 }
 101                 v4l_dbg(1, debug, client, "TDA9840_SWITCH: 0x%02x\n", byte);
 102                 tda9840_write(client, SWITCH, byte);
 103                 break;
 104         }
 105
 106         case VIDIOC_G_TUNER: {
 107                 struct v4l2_tuner *t = arg;
 108                 u8 byte;
 109
 110                 t->rxsubchans = V4L2_TUNER_SUB_MONO;
 111                 if (1 != i2c_master_recv(client, &byte, 1)) {
 112                         v4l_dbg(1, debug, client,
 113                                 "i2c_master_recv() failed\n");
 114                         return -EIO;
 115                 }
 116
 117                 if (byte & 0x80) {
 118                         v4l_dbg(1, debug, client,
 119                                 "TDA9840_DETECT: register contents invalid\n");
 120                         return -EINVAL;
 121                 }
 122
 123                 v4l_dbg(1, debug, client, "TDA9840_DETECT: byte: 0x%02x\n", byte);
 124
 125                 switch (byte & 0x60) {
 126                 case 0x00:
 127                         t->rxsubchans = V4L2_TUNER_SUB_MONO;
 128                         break;
 129                 case 0x20:
 130                         t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
 131                         break;
 132                 case 0x40:
 133                         t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
 134                         break;
 135                 default: /* Incorrect detect */
 136                         t->rxsubchans = V4L2_TUNER_MODE_MONO;
 137                         break;
 138                 }
 139                 break;
 140         }
 141
 142         case TDA9840_LEVEL_ADJUST:
 143                 v4l_dbg(1, debug, client, "TDA9840_LEVEL_ADJUST: %d\n", byte);
 144
 145                 /* check for correct range */
 146                 if (byte > 25 || byte < -20)
 147                         return -EINVAL;
 148
 149                 /* calculate actual value to set, see specs, page 18 */
 150                 byte /= 5;
 151                 if (0 < byte)
 152                         byte += 0x8;
 153                 else
 154                         byte = -byte;
 155                 tda9840_write(client, LEVEL_ADJUST, byte);
 156                 break;
 157
 158         case TDA9840_STEREO_ADJUST:
 159                 v4l_dbg(1, debug, client, "TDA9840_STEREO_ADJUST: %d\n", byte);
 160
 161                 /* check for correct range */
 162                 if (byte > 25 || byte < -24)
 163                         return -EINVAL;
 164
 165                 /* calculate actual value to set */
 166                 byte /= 5;
 167                 if (0 < byte)
 168                         byte += 0x20;
 169                 else
 170                         byte = -byte;
 171
 172                 tda9840_write(client, STEREO_ADJUST, byte);
 173                 break;
 174         default:
 175                 return -ENOIOCTLCMD;
 176         }
 177
 178         return 0;
 179 }
 180
 181 static int tda9840_probe(struct i2c_client *client,
 182                           const struct i2c_device_id *id)
 183 {
 184         int result;
 185         int byte;
 186
 187         /* let's see whether this adapter can support what we need */
 188         if (!i2c_check_functionality(client->adapter,
 189                         I2C_FUNC_SMBUS_READ_BYTE_DATA |
 190                         I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
 191                 return 0;
 192
 193         v4l_info(client, "chip found @ 0x%x (%s)\n",
 194                         client->addr << 1, client->adapter->name);
 195
 196         /* set initial values for level & stereo - adjustment, mode */
 197         byte = 0;
 198         result = tda9840_command(client, TDA9840_LEVEL_ADJUST, &byte);
 199         result += tda9840_command(client, TDA9840_STEREO_ADJUST, &byte);
 200         tda9840_write(client, SWITCH, TDA9840_SET_STEREO);
 201         if (result) {
 202                 v4l_dbg(1, debug, client, "could not initialize tda9840\n");
 203                 return -ENODEV;
 204         }
 205         return 0;
 206 }
 207
 208 static int tda9840_legacy_probe(struct i2c_adapter *adapter)
 209 {
 210         /* Let's see whether this is a known adapter we can attach to.
 211            Prevents conflicts with tvaudio.c. */
 212         return adapter->id == I2C_HW_SAA7146;
 213 }
 214 static const struct i2c_device_id tda9840_id[] = {
 215         { "tda9840", 0 },
 216         { }
 217 };
 218 MODULE_DEVICE_TABLE(i2c, tda9840_id);
 219
 220 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 221         .name = "tda9840",
 222         .driverid = I2C_DRIVERID_TDA9840,
 223         .command = tda9840_command,
 224         .probe = tda9840_probe,
 225         .legacy_probe = tda9840_legacy_probe,
 226         .id_table = tda9840_id,
 227 };