linux/drivers/media/video/tea6415c.c
<<
>>
Prefs
   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
  40MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
  41MODULE_DESCRIPTION("tea6415c driver");
  42MODULE_LICENSE("GPL");
  43
  44static int debug;
  45module_param(debug, int, 0644);
  46
  47MODULE_PARM_DESC(debug, "Debug level (0-1)");
  48
  49
  50/* makes a connection between the input-pin 'i' and the output-pin 'o' */
  51static 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
 123static 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
 132static const struct v4l2_subdev_core_ops tea6415c_core_ops = {
 133        .g_chip_ident = tea6415c_g_chip_ident,
 134};
 135
 136static const struct v4l2_subdev_video_ops tea6415c_video_ops = {
 137        .s_routing = tea6415c_s_routing,
 138};
 139
 140static const struct v4l2_subdev_ops tea6415c_ops = {
 141        .core = &tea6415c_core_ops,
 142        .video = &tea6415c_video_ops,
 143};
 144
 145static 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
 163static 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
 172static const struct i2c_device_id tea6415c_id[] = {
 173        { "tea6415c", 0 },
 174        { }
 175};
 176MODULE_DEVICE_TABLE(i2c, tea6415c_id);
 177
 178static 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};
 184