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-device.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 v4l2_subdev *sd, u8 reg, u8 val)
  66 {
  67         struct i2c_client *client = v4l2_get_subdevdata(sd);
  68
  69         if (i2c_smbus_write_byte_data(client, reg, val))
  70                 v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n",
  71                                 val, reg);
  72 }
  73
  74 static int tda9840_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
  75 {
  76         int byte;
  77
  78         if (t->index)
  79                 return -EINVAL;
  80
  81         switch (t->audmode) {
  82         case V4L2_TUNER_MODE_STEREO:
  83                 byte = TDA9840_SET_STEREO;
  84                 break;
  85         case V4L2_TUNER_MODE_LANG1_LANG2:
  86                 byte = TDA9840_SET_BOTH;
  87                 break;
  88         case V4L2_TUNER_MODE_LANG1:
  89                 byte = TDA9840_SET_LANG1;
  90                 break;
  91         case V4L2_TUNER_MODE_LANG2:
  92                 byte = TDA9840_SET_LANG2;
  93                 break;
  94         default:
  95                 byte = TDA9840_SET_MONO;
  96                 break;
  97         }
  98         v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
  99         tda9840_write(sd, SWITCH, byte);
 100         return 0;
 101 }
 102
 103 static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
 104 {
 105         struct i2c_client *client = v4l2_get_subdevdata(sd);
 106         u8 byte;
 107
 108         t->rxsubchans = V4L2_TUNER_SUB_MONO;
 109         if (1 != i2c_master_recv(client, &byte, 1)) {
 110                 v4l2_dbg(1, debug, sd,
 111                         "i2c_master_recv() failed\n");
 112                 return -EIO;
 113         }
 114
 115         if (byte & 0x80) {
 116                 v4l2_dbg(1, debug, sd,
 117                         "TDA9840_DETECT: register contents invalid\n");
 118                 return -EINVAL;
 119         }
 120
 121         v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
 122
 123         switch (byte & 0x60) {
 124         case 0x00:
 125                 t->rxsubchans = V4L2_TUNER_SUB_MONO;
 126                 break;
 127         case 0x20:
 128                 t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
 129                 break;
 130         case 0x40:
 131                 t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
 132                 break;
 133         default: /* Incorrect detect */
 134                 t->rxsubchans = V4L2_TUNER_MODE_MONO;
 135                 break;
 136         }
 137         return 0;
 138 }
 139
 140 static long tda9840_ioctl(struct v4l2_subdev *sd, unsigned cmd, void *arg)
 141 {
 142         int byte;
 143
 144         switch (cmd) {
 145         case TDA9840_LEVEL_ADJUST:
 146                 byte = *(int *)arg;
 147                 v4l2_dbg(1, debug, sd, "TDA9840_LEVEL_ADJUST: %d\n", byte);
 148
 149                 /* check for correct range */
 150                 if (byte > 25 || byte < -20)
 151                         return -EINVAL;
 152
 153                 /* calculate actual value to set, see specs, page 18 */
 154                 byte /= 5;
 155                 if (0 < byte)
 156                         byte += 0x8;
 157                 else
 158                         byte = -byte;
 159                 tda9840_write(sd, LEVEL_ADJUST, byte);
 160                 break;
 161
 162         case TDA9840_STEREO_ADJUST:
 163                 byte = *(int *)arg;
 164                 v4l2_dbg(1, debug, sd, "TDA9840_STEREO_ADJUST: %d\n", byte);
 165
 166                 /* check for correct range */
 167                 if (byte > 25 || byte < -24)
 168                         return -EINVAL;
 169
 170                 /* calculate actual value to set */
 171                 byte /= 5;
 172                 if (0 < byte)
 173                         byte += 0x20;
 174                 else
 175                         byte = -byte;
 176
 177                 tda9840_write(sd, STEREO_ADJUST, byte);
 178                 break;
 179         default:
 180                 return -ENOIOCTLCMD;
 181         }
 182         return 0;
 183 }
 184
 185 static int tda9840_command(struct i2c_client *client, unsigned cmd, void *arg)
 186 {
 187         return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
 188 }
 189
 190 /* ----------------------------------------------------------------------- */
 191
 192 static const struct v4l2_subdev_core_ops tda9840_core_ops = {
 193         .ioctl = tda9840_ioctl,
 194 };
 195
 196 static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
 197         .s_tuner = tda9840_s_tuner,
 198         .g_tuner = tda9840_g_tuner,
 199 };
 200
 201 static const struct v4l2_subdev_ops tda9840_ops = {
 202         .core = &tda9840_core_ops,
 203         .tuner = &tda9840_tuner_ops,
 204 };
 205
 206 /* ----------------------------------------------------------------------- */
 207
 208 static int tda9840_probe(struct i2c_client *client,
 209                           const struct i2c_device_id *id)
 210 {
 211         struct v4l2_subdev *sd;
 212         int result;
 213         int byte;
 214
 215         /* let's see whether this adapter can support what we need */
 216         if (!i2c_check_functionality(client->adapter,
 217                         I2C_FUNC_SMBUS_READ_BYTE_DATA |
 218                         I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
 219                 return -EIO;
 220
 221         v4l_info(client, "chip found @ 0x%x (%s)\n",
 222                         client->addr << 1, client->adapter->name);
 223
 224         sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
 225         if (sd == NULL)
 226                 return -ENOMEM;
 227         v4l2_i2c_subdev_init(sd, client, &tda9840_ops);
 228
 229         /* set initial values for level & stereo - adjustment, mode */
 230         byte = 0;
 231         result = tda9840_ioctl(sd, TDA9840_LEVEL_ADJUST, &byte);
 232         result |= tda9840_ioctl(sd, TDA9840_STEREO_ADJUST, &byte);
 233         tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
 234         if (result) {
 235                 v4l2_dbg(1, debug, sd, "could not initialize tda9840\n");
 236                 kfree(sd);
 237                 return -ENODEV;
 238         }
 239         return 0;
 240 }
 241
 242 static int tda9840_remove(struct i2c_client *client)
 243 {
 244         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 245
 246         v4l2_device_unregister_subdev(sd);
 247         kfree(sd);
 248         return 0;
 249 }
 250
 251 static int tda9840_legacy_probe(struct i2c_adapter *adapter)
 252 {
 253         /* Let's see whether this is a known adapter we can attach to.
 254            Prevents conflicts with tvaudio.c. */
 255         return adapter->id == I2C_HW_SAA7146;
 256 }
 257 static const struct i2c_device_id tda9840_id[] = {
 258         { "tda9840", 0 },
 259         { }
 260 };
 261 MODULE_DEVICE_TABLE(i2c, tda9840_id);
 262
 263 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 264         .name = "tda9840",
 265         .driverid = I2C_DRIVERID_TDA9840,
 266         .command = tda9840_command,
 267         .probe = tda9840_probe,
 268         .remove = tda9840_remove,
 269         .legacy_probe = tda9840_legacy_probe,
 270         .id_table = tda9840_id,
 271 };