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 "tea6415c.h" 37 38 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); 39 MODULE_DESCRIPTION("tea6415c driver"); 40 MODULE_LICENSE("GPL"); 41 42 static int debug; 43 module_param(debug, int, 0644); 44 45 MODULE_PARM_DESC(debug, "Debug level (0-1)"); 46 47 48 /* makes a connection between the input-pin 'i' and the output-pin 'o' */ 49 static int tea6415c_s_routing(struct v4l2_subdev *sd, 50 u32 i, u32 o, u32 config) 51 { 52 struct i2c_client *client = v4l2_get_subdevdata(sd); 53 u8 byte = 0; 54 int ret; 55 56 v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o); 57 58 /* check if the pins are valid */ 59 if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i) 60 && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o))) 61 return -EINVAL; 62 63 /* to understand this, have a look at the tea6415c-specs (p.5) */ 64 switch (o) { 65 case 18: 66 byte = 0x00; 67 break; 68 case 14: 69 byte = 0x20; 70 break; 71 case 16: 72 byte = 0x10; 73 break; 74 case 17: 75 byte = 0x08; 76 break; 77 case 15: 78 byte = 0x18; 79 break; 80 case 13: 81 byte = 0x28; 82 break; 83 } 84 85 switch (i) { 86 case 5: 87 byte |= 0x00; 88 break; 89 case 8: 90 byte |= 0x04; 91 break; 92 case 3: 93 byte |= 0x02; 94 break; 95 case 20: 96 byte |= 0x06; 97 break; 98 case 6: 99 byte |= 0x01; 100 break; 101 case 10: 102 byte |= 0x05; 103 break; 104 case 1: 105 byte |= 0x03; 106 break; 107 case 11: 108 byte |= 0x07; 109 break; 110 } 111 112 ret = i2c_smbus_write_byte(client, byte); 113 if (ret) { 114 v4l2_dbg(1, debug, sd, 115 "i2c_smbus_write_byte() failed, ret:%d\n", ret); 116 return -EIO; 117 } 118 return ret; 119 } 120 121 /* ----------------------------------------------------------------------- */ 122 123 static const struct v4l2_subdev_video_ops tea6415c_video_ops = { 124 .s_routing = tea6415c_s_routing, 125 }; 126 127 static const struct v4l2_subdev_ops tea6415c_ops = { 128 .video = &tea6415c_video_ops, 129 }; 130 131 static int tea6415c_probe(struct i2c_client *client, 132 const struct i2c_device_id *id) 133 { 134 struct v4l2_subdev *sd; 135 136 /* let's see whether this adapter can support what we need */ 137 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) 138 return -EIO; 139 140 v4l_info(client, "chip found @ 0x%x (%s)\n", 141 client->addr << 1, client->adapter->name); 142 sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); 143 if (sd == NULL) 144 return -ENOMEM; 145 v4l2_i2c_subdev_init(sd, client, &tea6415c_ops); 146 return 0; 147 } 148 149 static int tea6415c_remove(struct i2c_client *client) 150 { 151 struct v4l2_subdev *sd = i2c_get_clientdata(client); 152 153 v4l2_device_unregister_subdev(sd); 154 return 0; 155 } 156 157 static const struct i2c_device_id tea6415c_id[] = { 158 { "tea6415c", 0 }, 159 { } 160 }; 161 MODULE_DEVICE_TABLE(i2c, tea6415c_id); 162 163 static struct i2c_driver tea6415c_driver = { 164 .driver = { 165 .name = "tea6415c", 166 }, 167 .probe = tea6415c_probe, 168 .remove = tea6415c_remove, 169 .id_table = tea6415c_id, 170 }; 171 172 module_i2c_driver(tea6415c_driver); 173