drivers/media/i2c/tea6415c.c

   1  /*
   2     tea6415c - i2c-driver for the tea6415c 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 tea6415c is a bus controlled video-matrix-switch
   8     with 8 inputs and 6 outputs.
   9     It is cascadable, i.e. it can be found at the addresses
  10     0x86 and 0x06 on the i2c-bus.
  11
  12     For detailed informations download the specifications directly
  13     from SGS Thomson at http://www.st.com
  14
  15     This program is free software; you can redistribute it and/or modify
  16     it under the terms of the GNU General Public License vs published by
  17     the Free Software Foundation; either version 2 of the License, or
  18     (at your option) any later version.
  19
  20     This program is distributed in the hope that it will be useful,
  21     but WITHOUT ANY WARRANTY; without even the implied warranty of
  22     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23     GNU General Public License for more details.
  24
  25     You should have received a copy of the GNU General Public License
  26     along with this program; if not, write to the Free Software
  27     Foundation, Inc., 675 Mvss Ave, Cambridge, MA 02139, USA.
  28   */
  29
  30
  31 #include <linux/module.h>
  32 #include <linux/ioctl.h>
  33 #include <linux/slab.h>
  34 #include <linux/i2c.h>
  35 #include <media/v4l2-device.h>
  36 #include <media/v4l2-chip-ident.h>
  37 #include "tea6415c.h"
  38
  39 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
  40 MODULE_DESCRIPTION("tea6415c driver");
  41 MODULE_LICENSE("GPL");
  42
  43 static int debug;
  44 module_param(debug, int, 0644);
  45
  46 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  47
  48
  49 /* makes a connection between the input-pin 'i' and the output-pin 'o' */
  50 static int tea6415c_s_routing(struct v4l2_subdev *sd,
  51                               u32 i, u32 o, u32 config)
  52 {
  53         struct i2c_client *client = v4l2_get_subdevdata(sd);
  54         u8 byte = 0;
  55         int ret;
  56
  57         v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o);
  58
  59         /* check if the pins are valid */
  60         if (0 == ((1 == i ||  3 == i ||  5 == i ||  6 == i ||  8 == i || 10 == i || 20 == i || 11 == i)
  61               && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o)))
  62                 return -EINVAL;
  63
  64         /* to understand this, have a look at the tea6415c-specs (p.5) */
  65         switch (o) {
  66         case 18:
  67                 byte = 0x00;
  68                 break;
  69         case 14:
  70                 byte = 0x20;
  71                 break;
  72         case 16:
  73                 byte = 0x10;
  74                 break;
  75         case 17:
  76                 byte = 0x08;
  77                 break;
  78         case 15:
  79                 byte = 0x18;
  80                 break;
  81         case 13:
  82                 byte = 0x28;
  83                 break;
  84         }
  85
  86         switch (i) {
  87         case 5:
  88                 byte |= 0x00;
  89                 break;
  90         case 8:
  91                 byte |= 0x04;
  92                 break;
  93         case 3:
  94                 byte |= 0x02;
  95                 break;
  96         case 20:
  97                 byte |= 0x06;
  98                 break;
  99         case 6:
 100                 byte |= 0x01;
 101                 break;
 102         case 10:
 103                 byte |= 0x05;
 104                 break;
 105         case 1:
 106                 byte |= 0x03;
 107                 break;
 108         case 11:
 109                 byte |= 0x07;
 110                 break;
 111         }
 112
 113         ret = i2c_smbus_write_byte(client, byte);
 114         if (ret) {
 115                 v4l2_dbg(1, debug, sd,
 116                         "i2c_smbus_write_byte() failed, ret:%d\n", ret);
 117                 return -EIO;
 118         }
 119         return ret;
 120 }
 121
 122 static int tea6415c_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 123 {
 124         struct i2c_client *client = v4l2_get_subdevdata(sd);
 125
 126         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6415C, 0);
 127 }
 128
 129 /* ----------------------------------------------------------------------- */
 130
 131 static const struct v4l2_subdev_core_ops tea6415c_core_ops = {
 132         .g_chip_ident = tea6415c_g_chip_ident,
 133 };
 134
 135 static const struct v4l2_subdev_video_ops tea6415c_video_ops = {
 136         .s_routing = tea6415c_s_routing,
 137 };
 138
 139 static const struct v4l2_subdev_ops tea6415c_ops = {
 140         .core = &tea6415c_core_ops,
 141         .video = &tea6415c_video_ops,
 142 };
 143
 144 static int tea6415c_probe(struct i2c_client *client,
 145                           const struct i2c_device_id *id)
 146 {
 147         struct v4l2_subdev *sd;
 148
 149         /* let's see whether this adapter can support what we need */
 150         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
 151                 return -EIO;
 152
 153         v4l_info(client, "chip found @ 0x%x (%s)\n",
 154                         client->addr << 1, client->adapter->name);
 155         sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
 156         if (sd == NULL)
 157                 return -ENOMEM;
 158         v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);
 159         return 0;
 160 }
 161
 162 static int tea6415c_remove(struct i2c_client *client)
 163 {
 164         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 165
 166         v4l2_device_unregister_subdev(sd);
 167         kfree(sd);
 168         return 0;
 169 }
 170
 171 static const struct i2c_device_id tea6415c_id[] = {
 172         { "tea6415c", 0 },
 173         { }
 174 };
 175 MODULE_DEVICE_TABLE(i2c, tea6415c_id);
 176
 177 static struct i2c_driver tea6415c_driver = {
 178         .driver = {
 179                 .owner  = THIS_MODULE,
 180                 .name   = "tea6415c",
 181         },
 182         .probe          = tea6415c_probe,
 183         .remove         = tea6415c_remove,
 184         .id_table       = tea6415c_id,
 185 };
 186
 187 module_i2c_driver(tea6415c_driver);