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1// SPDX-License-Identifier: GPL-2.0-or-later2 /*3 tea6415c - i2c-driver for the tea6415c by SGS Thomson4 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-switch9 with 8 inputs and 6 outputs.10 It is cascadable, i.e. it can be found at the addresses11 0x86 and 0x06 on the i2c-bus.12 13 For detailed information download the specifications directly14 from SGS Thomson at http://www.st.com15 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{121 struct v4l2_subdev *sd;122 123 /* let's see whether this adapter can support what we need */124 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))125 return -EIO;126 127 v4l_info(client, "chip found @ 0x%x (%s)\n",128 client->addr << 1, client->adapter->name);129 sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);130 if (sd == NULL)131 return -ENOMEM;132 v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);133 return 0;134}135 136static void tea6415c_remove(struct i2c_client *client)137{138 struct v4l2_subdev *sd = i2c_get_clientdata(client);139 140 v4l2_device_unregister_subdev(sd);141}142 143static const struct i2c_device_id tea6415c_id[] = {144 { "tea6415c" },145 { }146};147MODULE_DEVICE_TABLE(i2c, tea6415c_id);148 149static struct i2c_driver tea6415c_driver = {150 .driver = {151 .name = "tea6415c",152 },153 .probe = tea6415c_probe,154 .remove = tea6415c_remove,155 .id_table = tea6415c_id,156};157 158module_i2c_driver(tea6415c_driver);159