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 <media/v4l2-i2c-drv.h> 38#include "tea6415c.h" 39 40MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); 41MODULE_DESCRIPTION("tea6415c driver"); 42MODULE_LICENSE("GPL"); 43 44static int debug; 45module_param(debug, int, 0644); 46 47MODULE_PARM_DESC(debug, "Debug level (0-1)"); 48 49 50/* makes a connection between the input-pin 'i' and the output-pin 'o' */ 51static int tea6415c_s_routing(struct v4l2_subdev *sd, 52 u32 i, u32 o, u32 config) 53{ 54 struct i2c_client *client = v4l2_get_subdevdata(sd); 55 u8 byte = 0; 56 int ret; 57 58 v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o); 59 60 /* check if the pins are valid */ 61 if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i) 62 && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o))) 63 return -EINVAL; 64 65 /* to understand this, have a look at the tea6415c-specs (p.5) */ 66 switch (o) { 67 case 18: 68 byte = 0x00; 69 break; 70 case 14: 71 byte = 0x20; 72 break; 73 case 16: 74 byte = 0x10; 75 break; 76 case 17: 77 byte = 0x08; 78 break; 79 case 15: 80 byte = 0x18; 81 break; 82 case 13: 83 byte = 0x28; 84 break; 85 }; 86 87 switch (i) { 88 case 5: 89 byte |= 0x00; 90 break; 91 case 8: 92 byte |= 0x04; 93 break; 94 case 3: 95 byte |= 0x02; 96 break; 97 case 20: 98 byte |= 0x06; 99 break; 100 case 6: 101 byte |= 0x01; 102 break; 103 case 10: 104 byte |= 0x05; 105 break; 106 case 1: 107 byte |= 0x03; 108 break; 109 case 11: 110 byte |= 0x07; 111 break; 112 }; 113 114 ret = i2c_smbus_write_byte(client, byte); 115 if (ret) { 116 v4l2_dbg(1, debug, sd, 117 "i2c_smbus_write_byte() failed, ret:%d\n", ret); 118 return -EIO; 119 } 120 return ret; 121} 122 123static int tea6415c_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) 124{ 125 struct i2c_client *client = v4l2_get_subdevdata(sd); 126 127 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6415C, 0); 128} 129 130/* ----------------------------------------------------------------------- */ 131 132static const struct v4l2_subdev_core_ops tea6415c_core_ops = { 133 .g_chip_ident = tea6415c_g_chip_ident, 134}; 135 136static const struct v4l2_subdev_video_ops tea6415c_video_ops = { 137 .s_routing = tea6415c_s_routing, 138}; 139 140static const struct v4l2_subdev_ops tea6415c_ops = { 141 .core = &tea6415c_core_ops, 142 .video = &tea6415c_video_ops, 143}; 144 145static int tea6415c_probe(struct i2c_client *client, 146 const struct i2c_device_id *id) 147{ 148 struct v4l2_subdev *sd; 149 150 /* let's see whether this adapter can support what we need */ 151 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) 152 return 0; 153 154 v4l_info(client, "chip found @ 0x%x (%s)\n", 155 client->addr << 1, client->adapter->name); 156 sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL); 157 if (sd == NULL) 158 return -ENOMEM; 159 v4l2_i2c_subdev_init(sd, client, &tea6415c_ops); 160 return 0; 161} 162 163static int tea6415c_remove(struct i2c_client *client) 164{ 165 struct v4l2_subdev *sd = i2c_get_clientdata(client); 166 167 v4l2_device_unregister_subdev(sd); 168 kfree(sd); 169 return 0; 170} 171 172static const struct i2c_device_id tea6415c_id[] = { 173 { "tea6415c", 0 }, 174 { } 175}; 176MODULE_DEVICE_TABLE(i2c, tea6415c_id); 177 178static struct v4l2_i2c_driver_data v4l2_i2c_data = { 179 .name = "tea6415c", 180 .probe = tea6415c_probe, 181 .remove = tea6415c_remove, 182 .id_table = tea6415c_id, 183}; 184