161 lines
3.4 KiB
C
161 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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tea6415c - i2c-driver for the tea6415c by SGS Thomson
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Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
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Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
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The tea6415c is a bus controlled video-matrix-switch
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with 8 inputs and 6 outputs.
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It is cascadable, i.e. it can be found at the addresses
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0x86 and 0x06 on the i2c-bus.
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For detailed information download the specifications directly
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from SGS Thomson at http://www.st.com
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*/
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#include <linux/module.h>
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#include <linux/ioctl.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <media/v4l2-device.h>
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#include "tea6415c.h"
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MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
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MODULE_DESCRIPTION("tea6415c driver");
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MODULE_LICENSE("GPL");
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static int debug;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "Debug level (0-1)");
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/* makes a connection between the input-pin 'i' and the output-pin 'o' */
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static int tea6415c_s_routing(struct v4l2_subdev *sd,
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u32 i, u32 o, u32 config)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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u8 byte = 0;
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int ret;
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v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o);
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/* check if the pins are valid */
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if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i)
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&& (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o)))
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return -EINVAL;
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/* to understand this, have a look at the tea6415c-specs (p.5) */
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switch (o) {
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case 18:
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byte = 0x00;
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break;
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case 14:
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byte = 0x20;
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break;
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case 16:
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byte = 0x10;
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break;
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case 17:
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byte = 0x08;
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break;
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case 15:
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byte = 0x18;
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break;
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case 13:
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byte = 0x28;
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break;
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}
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switch (i) {
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case 5:
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byte |= 0x00;
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break;
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case 8:
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byte |= 0x04;
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break;
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case 3:
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byte |= 0x02;
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break;
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case 20:
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byte |= 0x06;
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break;
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case 6:
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byte |= 0x01;
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break;
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case 10:
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byte |= 0x05;
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break;
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case 1:
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byte |= 0x03;
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break;
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case 11:
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byte |= 0x07;
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break;
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}
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ret = i2c_smbus_write_byte(client, byte);
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if (ret) {
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v4l2_dbg(1, debug, sd,
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"i2c_smbus_write_byte() failed, ret:%d\n", ret);
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return -EIO;
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}
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return ret;
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}
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/* ----------------------------------------------------------------------- */
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static const struct v4l2_subdev_video_ops tea6415c_video_ops = {
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.s_routing = tea6415c_s_routing,
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};
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static const struct v4l2_subdev_ops tea6415c_ops = {
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.video = &tea6415c_video_ops,
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};
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static int tea6415c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct v4l2_subdev *sd;
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/* let's see whether this adapter can support what we need */
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
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return -EIO;
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v4l_info(client, "chip found @ 0x%x (%s)\n",
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client->addr << 1, client->adapter->name);
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sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
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if (sd == NULL)
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return -ENOMEM;
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v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);
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return 0;
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}
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static int tea6415c_remove(struct i2c_client *client)
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{
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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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v4l2_device_unregister_subdev(sd);
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return 0;
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}
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static const struct i2c_device_id tea6415c_id[] = {
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{ "tea6415c", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tea6415c_id);
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static struct i2c_driver tea6415c_driver = {
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.driver = {
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.name = "tea6415c",
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},
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.probe = tea6415c_probe,
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.remove = tea6415c_remove,
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.id_table = tea6415c_id,
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};
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module_i2c_driver(tea6415c_driver);
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