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 <media/v4l2-chip-ident.h> 37 #include "tea6415c.h" 38 39 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); 40 MODULE_DESCRIPTION("tea6415c driver"); 41 MODULE_LICENSE("GPL"); 42 43 static int debug; 44 module_param(debug, int, 0644); 45 46 MODULE_PARM_DESC(debug, "Debug level (0-1)"); 47 48 49 /* makes a connection between the input-pin 'i' and the output-pin 'o' */ 50 static int tea6415c_s_routing(struct v4l2_subdev *sd, 51 u32 i, u32 o, u32 config) 52 { 53 struct i2c_client *client = v4l2_get_subdevdata(sd); 54 u8 byte = 0; 55 int ret; 56 57 v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o); 58 59 /* check if the pins are valid */ 60 if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i) 61 && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o))) 62 return -EINVAL; 63 64 /* to understand this, have a look at the tea6415c-specs (p.5) */ 65 switch (o) { 66 case 18: 67 byte = 0x00; 68 break; 69 case 14: 70 byte = 0x20; 71 break; 72 case 16: 73 byte = 0x10; 74 break; 75 case 17: 76 byte = 0x08; 77 break; 78 case 15: 79 byte = 0x18; 80 break; 81 case 13: 82 byte = 0x28; 83 break; 84 } 85 86 switch (i) { 87 case 5: 88 byte |= 0x00; 89 break; 90 case 8: 91 byte |= 0x04; 92 break; 93 case 3: 94 byte |= 0x02; 95 break; 96 case 20: 97 byte |= 0x06; 98 break; 99 case 6: 100 byte |= 0x01; 101 break; 102 case 10: 103 byte |= 0x05; 104 break; 105 case 1: 106 byte |= 0x03; 107 break; 108 case 11: 109 byte |= 0x07; 110 break; 111 } 112 113 ret = i2c_smbus_write_byte(client, byte); 114 if (ret) { 115 v4l2_dbg(1, debug, sd, 116 "i2c_smbus_write_byte() failed, ret:%d\n", ret); 117 return -EIO; 118 } 119 return ret; 120 } 121 122 static int tea6415c_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) 123 { 124 struct i2c_client *client = v4l2_get_subdevdata(sd); 125 126 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6415C, 0); 127 } 128 129 /* ----------------------------------------------------------------------- */ 130 131 static const struct v4l2_subdev_core_ops tea6415c_core_ops = { 132 .g_chip_ident = tea6415c_g_chip_ident, 133 }; 134 135 static const struct v4l2_subdev_video_ops tea6415c_video_ops = { 136 .s_routing = tea6415c_s_routing, 137 }; 138 139 static const struct v4l2_subdev_ops tea6415c_ops = { 140 .core = &tea6415c_core_ops, 141 .video = &tea6415c_video_ops, 142 }; 143 144 static int tea6415c_probe(struct i2c_client *client, 145 const struct i2c_device_id *id) 146 { 147 struct v4l2_subdev *sd; 148 149 /* let's see whether this adapter can support what we need */ 150 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) 151 return -EIO; 152 153 v4l_info(client, "chip found @ 0x%x (%s)\n", 154 client->addr << 1, client->adapter->name); 155 sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL); 156 if (sd == NULL) 157 return -ENOMEM; 158 v4l2_i2c_subdev_init(sd, client, &tea6415c_ops); 159 return 0; 160 } 161 162 static int tea6415c_remove(struct i2c_client *client) 163 { 164 struct v4l2_subdev *sd = i2c_get_clientdata(client); 165 166 v4l2_device_unregister_subdev(sd); 167 kfree(sd); 168 return 0; 169 } 170 171 static const struct i2c_device_id tea6415c_id[] = { 172 { "tea6415c", 0 }, 173 { } 174 }; 175 MODULE_DEVICE_TABLE(i2c, tea6415c_id); 176 177 static struct i2c_driver tea6415c_driver = { 178 .driver = { 179 .owner = THIS_MODULE, 180 .name = "tea6415c", 181 }, 182 .probe = tea6415c_probe, 183 .remove = tea6415c_remove, 184 .id_table = tea6415c_id, 185 }; 186 187 module_i2c_driver(tea6415c_driver); 188