LXR linux/drivers/media/i2c/tea6415c.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3    tea6415c - i2c-driver for the tea6415c by SGS Thomson
   4
   5    Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
   6    Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
   7
   8    The tea6415c is a bus controlled video-matrix-switch
   9    with 8 inputs and 6 outputs.
  10    It is cascadable, i.e. it can be found at the addresses
  11    0x86 and 0x06 on the i2c-bus.
  12
  13    For detailed information download the specifications directly
  14    from SGS Thomson at http://www.st.com
  15
  16  */
  17
  18
  19#include <linux/module.h>
  20#include <linux/ioctl.h>
  21#include <linux/slab.h>
  22#include <linux/i2c.h>
  23#include <media/v4l2-device.h>
  24#include "tea6415c.h"
  25
  26MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
  27MODULE_DESCRIPTION("tea6415c driver");
  28MODULE_LICENSE("GPL");
  29
  30static int debug;
  31module_param(debug, int, 0644);
  32
  33MODULE_PARM_DESC(debug, "Debug level (0-1)");
  34
  35
  36/* makes a connection between the input-pin 'i' and the output-pin 'o' */
  37static int tea6415c_s_routing(struct v4l2_subdev *sd,
  38                              u32 i, u32 o, u32 config)
  39{
  40        struct i2c_client *client = v4l2_get_subdevdata(sd);
  41        u8 byte = 0;
  42        int ret;
  43
  44        v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o);
  45
  46        /* check if the pins are valid */
  47        if (0 == ((1 == i ||  3 == i ||  5 == i ||  6 == i ||  8 == i || 10 == i || 20 == i || 11 == i)
  48              && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o)))
  49                return -EINVAL;
  50
  51        /* to understand this, have a look at the tea6415c-specs (p.5) */
  52        switch (o) {
  53        case 18:
  54                byte = 0x00;
  55                break;
  56        case 14:
  57                byte = 0x20;
  58                break;
  59        case 16:
  60                byte = 0x10;
  61                break;
  62        case 17:
  63                byte = 0x08;
  64                break;
  65        case 15:
  66                byte = 0x18;
  67                break;
  68        case 13:
  69                byte = 0x28;
  70                break;
  71        }
  72
  73        switch (i) {
  74        case 5:
  75                byte |= 0x00;
  76                break;
  77        case 8:
  78                byte |= 0x04;
  79                break;
  80        case 3:
  81                byte |= 0x02;
  82                break;
  83        case 20:
  84                byte |= 0x06;
  85                break;
  86        case 6:
  87                byte |= 0x01;
  88                break;
  89        case 10:
  90                byte |= 0x05;
  91                break;
  92        case 1:
  93                byte |= 0x03;
  94                break;
  95        case 11:
  96                byte |= 0x07;
  97                break;
  98        }
  99
 100        ret = i2c_smbus_write_byte(client, byte);
 101        if (ret) {
 102                v4l2_dbg(1, debug, sd,
 103                        "i2c_smbus_write_byte() failed, ret:%d\n", ret);
 104                return -EIO;
 105        }
 106        return ret;
 107}
 108
 109/* ----------------------------------------------------------------------- */
 110
 111static const struct v4l2_subdev_video_ops tea6415c_video_ops = {
 112        .s_routing = tea6415c_s_routing,
 113};
 114
 115static const struct v4l2_subdev_ops tea6415c_ops = {
 116        .video = &tea6415c_video_ops,
 117};
 118
 119static int tea6415c_probe(struct i2c_client *client,
 120                          const struct i2c_device_id *id)
 121{
 122        struct v4l2_subdev *sd;
 123
 124        /* let's see whether this adapter can support what we need */
 125        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
 126                return -EIO;
 127
 128        v4l_info(client, "chip found @ 0x%x (%s)\n",
 129                        client->addr << 1, client->adapter->name);
 130        sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
 131        if (sd == NULL)
 132                return -ENOMEM;
 133        v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);
 134        return 0;
 135}
 136
 137static int tea6415c_remove(struct i2c_client *client)
 138{
 139        struct v4l2_subdev *sd = i2c_get_clientdata(client);
 140
 141        v4l2_device_unregister_subdev(sd);
 142        return 0;
 143}
 144
 145static const struct i2c_device_id tea6415c_id[] = {
 146        { "tea6415c", 0 },
 147        { }
 148};
 149MODULE_DEVICE_TABLE(i2c, tea6415c_id);
 150
 151static struct i2c_driver tea6415c_driver = {
 152        .driver = {
 153                .name   = "tea6415c",
 154        },
 155        .probe          = tea6415c_probe,
 156        .remove         = tea6415c_remove,
 157        .id_table       = tea6415c_id,
 158};
 159
 160module_i2c_driver(tea6415c_driver);
 161