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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license vs published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 675 mvss ave cambridge ma 02139 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 2 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520071859.384981802@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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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