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/slab.h>
  32 #include <linux/i2c.h>
  33 #include <media/v4l2-device.h>
  34 #include <media/v4l2-chip-ident.h>
  35 #include <media/v4l2-i2c-drv.h>
  36
  37 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
  38 MODULE_DESCRIPTION("tda9840 driver");
  39 MODULE_LICENSE("GPL");
  40
  41 static int debug;
  42 module_param(debug, int, 0644);
  43
  44 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  45
  46 #define SWITCH          0x00
  47 #define LEVEL_ADJUST    0x02
  48 #define STEREO_ADJUST   0x03
  49 #define TEST            0x04
  50
  51 #define TDA9840_SET_MUTE                0x00
  52 #define TDA9840_SET_MONO                0x10
  53 #define TDA9840_SET_STEREO              0x2a
  54 #define TDA9840_SET_LANG1               0x12
  55 #define TDA9840_SET_LANG2               0x1e
  56 #define TDA9840_SET_BOTH                0x1a
  57 #define TDA9840_SET_BOTH_R              0x16
  58 #define TDA9840_SET_EXTERNAL            0x7a
  59
  60
  61 static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val)
  62 {
  63         struct i2c_client *client = v4l2_get_subdevdata(sd);
  64
  65         if (i2c_smbus_write_byte_data(client, reg, val))
  66                 v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n",
  67                                 val, reg);
  68 }
  69
  70 static int tda9840_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
  71 {
  72         int byte;
  73
  74         if (t->index)
  75                 return -EINVAL;
  76
  77         switch (t->audmode) {
  78         case V4L2_TUNER_MODE_STEREO:
  79                 byte = TDA9840_SET_STEREO;
  80                 break;
  81         case V4L2_TUNER_MODE_LANG1_LANG2:
  82                 byte = TDA9840_SET_BOTH;
  83                 break;
  84         case V4L2_TUNER_MODE_LANG1:
  85                 byte = TDA9840_SET_LANG1;
  86                 break;
  87         case V4L2_TUNER_MODE_LANG2:
  88                 byte = TDA9840_SET_LANG2;
  89                 break;
  90         default:
  91                 byte = TDA9840_SET_MONO;
  92                 break;
  93         }
  94         v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
  95         tda9840_write(sd, SWITCH, byte);
  96         return 0;
  97 }
  98
  99 static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
 100 {
 101         struct i2c_client *client = v4l2_get_subdevdata(sd);
 102         u8 byte;
 103
 104         t->rxsubchans = V4L2_TUNER_SUB_MONO;
 105         if (1 != i2c_master_recv(client, &byte, 1)) {
 106                 v4l2_dbg(1, debug, sd,
 107                         "i2c_master_recv() failed\n");
 108                 return -EIO;
 109         }
 110
 111         if (byte & 0x80) {
 112                 v4l2_dbg(1, debug, sd,
 113                         "TDA9840_DETECT: register contents invalid\n");
 114                 return -EINVAL;
 115         }
 116
 117         v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
 118
 119         switch (byte & 0x60) {
 120         case 0x00:
 121                 t->rxsubchans = V4L2_TUNER_SUB_MONO;
 122                 break;
 123         case 0x20:
 124                 t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
 125                 break;
 126         case 0x40:
 127                 t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
 128                 break;
 129         default: /* Incorrect detect */
 130                 t->rxsubchans = V4L2_TUNER_MODE_MONO;
 131                 break;
 132         }
 133         return 0;
 134 }
 135
 136 static int tda9840_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 137 {
 138         struct i2c_client *client = v4l2_get_subdevdata(sd);
 139
 140         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TDA9840, 0);
 141 }
 142
 143 /* ----------------------------------------------------------------------- */
 144
 145 static const struct v4l2_subdev_core_ops tda9840_core_ops = {
 146         .g_chip_ident = tda9840_g_chip_ident,
 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         .core = &tda9840_core_ops,
 156         .tuner = &tda9840_tuner_ops,
 157 };
 158
 159 /* ----------------------------------------------------------------------- */
 160
 161 static int tda9840_probe(struct i2c_client *client,
 162                           const struct i2c_device_id *id)
 163 {
 164         struct v4l2_subdev *sd;
 165
 166         /* let's see whether this adapter can support what we need */
 167         if (!i2c_check_functionality(client->adapter,
 168                         I2C_FUNC_SMBUS_READ_BYTE_DATA |
 169                         I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
 170                 return -EIO;
 171
 172         v4l_info(client, "chip found @ 0x%x (%s)\n",
 173                         client->addr << 1, client->adapter->name);
 174
 175         sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
 176         if (sd == NULL)
 177                 return -ENOMEM;
 178         v4l2_i2c_subdev_init(sd, client, &tda9840_ops);
 179
 180         /* set initial values for level & stereo - adjustment, mode */
 181         tda9840_write(sd, LEVEL_ADJUST, 0);
 182         tda9840_write(sd, STEREO_ADJUST, 0);
 183         tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
 184         return 0;
 185 }
 186
 187 static int tda9840_remove(struct i2c_client *client)
 188 {
 189         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 190
 191         v4l2_device_unregister_subdev(sd);
 192         kfree(sd);
 193         return 0;
 194 }
 195
 196 static const struct i2c_device_id tda9840_id[] = {
 197         { "tda9840", 0 },
 198         { }
 199 };
 200 MODULE_DEVICE_TABLE(i2c, tda9840_id);
 201
 202 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 203         .name = "tda9840",
 204         .probe = tda9840_probe,
 205         .remove = tda9840_remove,
 206         .id_table = tda9840_id,
 207 };