drivers/media/video/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 <media/v4l2-i2c-drv.h>
  38 #include "tea6415c.h"
  39
  40 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
  41 MODULE_DESCRIPTION("tea6415c driver");
  42 MODULE_LICENSE("GPL");
  43
  44 static int debug;
  45 module_param(debug, int, 0644);
  46
  47 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  48
  49
  50 /* makes a connection between the input-pin 'i' and the output-pin 'o' */
  51 static int tea6415c_s_routing(struct v4l2_subdev *sd,
  52                               u32 i, u32 o, u32 config)
  53 {
  54         struct i2c_client *client = v4l2_get_subdevdata(sd);
  55         u8 byte = 0;
  56         int ret;
  57
  58         v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o);
  59
  60         /* check if the pins are valid */
  61         if (0 == ((1 == i ||  3 == i ||  5 == i ||  6 == i ||  8 == i || 10 == i || 20 == i || 11 == i)
  62               && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o)))
  63                 return -EINVAL;
  64
  65         /* to understand this, have a look at the tea6415c-specs (p.5) */
  66         switch (o) {
  67         case 18:
  68                 byte = 0x00;
  69                 break;
  70         case 14:
  71                 byte = 0x20;
  72                 break;
  73         case 16:
  74                 byte = 0x10;
  75                 break;
  76         case 17:
  77                 byte = 0x08;
  78                 break;
  79         case 15:
  80                 byte = 0x18;
  81                 break;
  82         case 13:
  83                 byte = 0x28;
  84                 break;
  85         };
  86
  87         switch (i) {
  88         case 5:
  89                 byte |= 0x00;
  90                 break;
  91         case 8:
  92                 byte |= 0x04;
  93                 break;
  94         case 3:
  95                 byte |= 0x02;
  96                 break;
  97         case 20:
  98                 byte |= 0x06;
  99                 break;
 100         case 6:
 101                 byte |= 0x01;
 102                 break;
 103         case 10:
 104                 byte |= 0x05;
 105                 break;
 106         case 1:
 107                 byte |= 0x03;
 108                 break;
 109         case 11:
 110                 byte |= 0x07;
 111                 break;
 112         };
 113
 114         ret = i2c_smbus_write_byte(client, byte);
 115         if (ret) {
 116                 v4l2_dbg(1, debug, sd,
 117                         "i2c_smbus_write_byte() failed, ret:%d\n", ret);
 118                 return -EIO;
 119         }
 120         return ret;
 121 }
 122
 123 static int tea6415c_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 124 {
 125         struct i2c_client *client = v4l2_get_subdevdata(sd);
 126
 127         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6415C, 0);
 128 }
 129
 130 /* ----------------------------------------------------------------------- */
 131
 132 static const struct v4l2_subdev_core_ops tea6415c_core_ops = {
 133         .g_chip_ident = tea6415c_g_chip_ident,
 134 };
 135
 136 static const struct v4l2_subdev_video_ops tea6415c_video_ops = {
 137         .s_routing = tea6415c_s_routing,
 138 };
 139
 140 static const struct v4l2_subdev_ops tea6415c_ops = {
 141         .core = &tea6415c_core_ops,
 142         .video = &tea6415c_video_ops,
 143 };
 144
 145 static int tea6415c_probe(struct i2c_client *client,
 146                           const struct i2c_device_id *id)
 147 {
 148         struct v4l2_subdev *sd;
 149
 150         /* let's see whether this adapter can support what we need */
 151         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
 152                 return 0;
 153
 154         v4l_info(client, "chip found @ 0x%x (%s)\n",
 155                         client->addr << 1, client->adapter->name);
 156         sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
 157         if (sd == NULL)
 158                 return -ENOMEM;
 159         v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);
 160         return 0;
 161 }
 162
 163 static int tea6415c_remove(struct i2c_client *client)
 164 {
 165         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 166
 167         v4l2_device_unregister_subdev(sd);
 168         kfree(sd);
 169         return 0;
 170 }
 171
 172 static const struct i2c_device_id tea6415c_id[] = {
 173         { "tea6415c", 0 },
 174         { }
 175 };
 176 MODULE_DEVICE_TABLE(i2c, tea6415c_id);
 177
 178 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 179         .name = "tea6415c",
 180         .probe = tea6415c_probe,
 181         .remove = tea6415c_remove,
 182         .id_table = tea6415c_id,
 183 };