Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | tea6415c - i2c-driver for the tea6415c by SGS Thomson |
| 3 | |
| 4 | Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de> |
Hans Verkuil | a832781 | 2008-07-25 10:31:23 -0300 | [diff] [blame] | 5 | Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Mauro Carvalho Chehab | a8733ca | 2006-03-17 10:37:02 -0300 | [diff] [blame] | 30 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/module.h> |
| 32 | #include <linux/ioctl.h> |
| 33 | #include <linux/i2c.h> |
Hans Verkuil | 85d826b | 2008-12-18 12:29:07 -0300 | [diff] [blame] | 34 | #include <media/v4l2-device.h> |
Hans Verkuil | a832781 | 2008-07-25 10:31:23 -0300 | [diff] [blame] | 35 | #include <media/v4l2-i2c-drv-legacy.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include "tea6415c.h" |
| 37 | |
Hans Verkuil | a832781 | 2008-07-25 10:31:23 -0300 | [diff] [blame] | 38 | MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); |
| 39 | MODULE_DESCRIPTION("tea6415c driver"); |
| 40 | MODULE_LICENSE("GPL"); |
| 41 | |
| 42 | static int debug; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | module_param(debug, int, 0644); |
Hans Verkuil | f87086e | 2008-07-18 00:50:58 -0300 | [diff] [blame] | 44 | |
Hans Verkuil | a832781 | 2008-07-25 10:31:23 -0300 | [diff] [blame] | 45 | MODULE_PARM_DESC(debug, "Debug level (0-1)"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
| 47 | /* addresses to scan, found only at 0x03 and/or 0x43 (7-bit) */ |
| 48 | static unsigned short normal_i2c[] = { I2C_TEA6415C_1, I2C_TEA6415C_2, I2C_CLIENT_END }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
| 50 | /* magic definition of all other variables and things */ |
| 51 | I2C_CLIENT_INSMOD; |
| 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | /* makes a connection between the input-pin 'i' and the output-pin 'o' |
| 54 | for the tea6415c-client 'client' */ |
| 55 | static int switch_matrix(struct i2c_client *client, int i, int o) |
| 56 | { |
| 57 | u8 byte = 0; |
| 58 | int ret; |
Mauro Carvalho Chehab | a8733ca | 2006-03-17 10:37:02 -0300 | [diff] [blame] | 59 | |
Hans Verkuil | a832781 | 2008-07-25 10:31:23 -0300 | [diff] [blame] | 60 | v4l_dbg(1, debug, client, "i=%d, o=%d\n", i, o); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
| 62 | /* check if the pins are valid */ |
| 63 | if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i) |
| 64 | && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o))) |
| 65 | return -1; |
| 66 | |
| 67 | /* to understand this, have a look at the tea6415c-specs (p.5) */ |
| 68 | switch (o) { |
| 69 | case 18: |
| 70 | byte = 0x00; |
| 71 | break; |
| 72 | case 14: |
| 73 | byte = 0x20; |
| 74 | break; |
| 75 | case 16: |
| 76 | byte = 0x10; |
| 77 | break; |
| 78 | case 17: |
| 79 | byte = 0x08; |
| 80 | break; |
| 81 | case 15: |
| 82 | byte = 0x18; |
| 83 | break; |
| 84 | case 13: |
| 85 | byte = 0x28; |
| 86 | break; |
| 87 | }; |
| 88 | |
| 89 | switch (i) { |
| 90 | case 5: |
| 91 | byte |= 0x00; |
| 92 | break; |
| 93 | case 8: |
| 94 | byte |= 0x04; |
| 95 | break; |
| 96 | case 3: |
| 97 | byte |= 0x02; |
| 98 | break; |
| 99 | case 20: |
| 100 | byte |= 0x06; |
| 101 | break; |
| 102 | case 6: |
| 103 | byte |= 0x01; |
| 104 | break; |
| 105 | case 10: |
| 106 | byte |= 0x05; |
| 107 | break; |
| 108 | case 1: |
| 109 | byte |= 0x03; |
| 110 | break; |
| 111 | case 11: |
| 112 | byte |= 0x07; |
| 113 | break; |
| 114 | }; |
| 115 | |
| 116 | ret = i2c_smbus_write_byte(client, byte); |
| 117 | if (ret) { |
Hans Verkuil | a832781 | 2008-07-25 10:31:23 -0300 | [diff] [blame] | 118 | v4l_dbg(1, debug, client, |
| 119 | "i2c_smbus_write_byte() failed, ret:%d\n", ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | return -EIO; |
| 121 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | return ret; |
| 123 | } |
| 124 | |
Hans Verkuil | 069b747 | 2008-12-30 07:04:34 -0300 | [diff] [blame] | 125 | static long tea6415c_ioctl(struct v4l2_subdev *sd, unsigned cmd, void *arg) |
Hans Verkuil | 85d826b | 2008-12-18 12:29:07 -0300 | [diff] [blame] | 126 | { |
| 127 | if (cmd == TEA6415C_SWITCH) { |
| 128 | struct i2c_client *client = v4l2_get_subdevdata(sd); |
| 129 | struct tea6415c_multiplex *v = (struct tea6415c_multiplex *)arg; |
| 130 | |
| 131 | return switch_matrix(client, v->in, v->out); |
| 132 | } |
| 133 | return -ENOIOCTLCMD; |
| 134 | } |
| 135 | |
Hans Verkuil | a832781 | 2008-07-25 10:31:23 -0300 | [diff] [blame] | 136 | static int tea6415c_command(struct i2c_client *client, unsigned cmd, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { |
Hans Verkuil | 85d826b | 2008-12-18 12:29:07 -0300 | [diff] [blame] | 138 | return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | } |
| 140 | |
Hans Verkuil | 85d826b | 2008-12-18 12:29:07 -0300 | [diff] [blame] | 141 | /* ----------------------------------------------------------------------- */ |
| 142 | |
| 143 | static const struct v4l2_subdev_core_ops tea6415c_core_ops = { |
| 144 | .ioctl = tea6415c_ioctl, |
| 145 | }; |
| 146 | |
| 147 | static const struct v4l2_subdev_ops tea6415c_ops = { |
| 148 | .core = &tea6415c_core_ops, |
| 149 | }; |
| 150 | |
Hans Verkuil | a832781 | 2008-07-25 10:31:23 -0300 | [diff] [blame] | 151 | /* this function is called by i2c_probe */ |
| 152 | static int tea6415c_probe(struct i2c_client *client, |
| 153 | const struct i2c_device_id *id) |
| 154 | { |
Hans Verkuil | 85d826b | 2008-12-18 12:29:07 -0300 | [diff] [blame] | 155 | struct v4l2_subdev *sd; |
| 156 | |
Hans Verkuil | a832781 | 2008-07-25 10:31:23 -0300 | [diff] [blame] | 157 | /* let's see whether this adapter can support what we need */ |
| 158 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) |
| 159 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
Hans Verkuil | a832781 | 2008-07-25 10:31:23 -0300 | [diff] [blame] | 161 | v4l_info(client, "chip found @ 0x%x (%s)\n", |
| 162 | client->addr << 1, client->adapter->name); |
Hans Verkuil | 85d826b | 2008-12-18 12:29:07 -0300 | [diff] [blame] | 163 | sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL); |
| 164 | if (sd == NULL) |
| 165 | return -ENOMEM; |
| 166 | v4l2_i2c_subdev_init(sd, client, &tea6415c_ops); |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | static int tea6415c_remove(struct i2c_client *client) |
| 171 | { |
| 172 | struct v4l2_subdev *sd = i2c_get_clientdata(client); |
| 173 | |
| 174 | v4l2_device_unregister_subdev(sd); |
| 175 | kfree(sd); |
Hans Verkuil | a832781 | 2008-07-25 10:31:23 -0300 | [diff] [blame] | 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | static int tea6415c_legacy_probe(struct i2c_adapter *adapter) |
| 180 | { |
| 181 | /* Let's see whether this is a known adapter we can attach to. |
| 182 | Prevents conflicts with tvaudio.c. */ |
| 183 | return adapter->id == I2C_HW_SAA7146; |
| 184 | } |
| 185 | |
| 186 | static const struct i2c_device_id tea6415c_id[] = { |
| 187 | { "tea6415c", 0 }, |
| 188 | { } |
| 189 | }; |
| 190 | MODULE_DEVICE_TABLE(i2c, tea6415c_id); |
| 191 | |
| 192 | static struct v4l2_i2c_driver_data v4l2_i2c_data = { |
Jean Delvare | fae91e7 | 2005-08-15 19:57:04 +0200 | [diff] [blame] | 193 | .name = "tea6415c", |
Hans Verkuil | a832781 | 2008-07-25 10:31:23 -0300 | [diff] [blame] | 194 | .command = tea6415c_command, |
| 195 | .probe = tea6415c_probe, |
Hans Verkuil | 85d826b | 2008-12-18 12:29:07 -0300 | [diff] [blame] | 196 | .remove = tea6415c_remove, |
Hans Verkuil | a832781 | 2008-07-25 10:31:23 -0300 | [diff] [blame] | 197 | .legacy_probe = tea6415c_legacy_probe, |
| 198 | .id_table = tea6415c_id, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | }; |