![Hans Verkuil](/assets/img/avatar_default.png)
Since internal to v4l2 the ioctl prototype is the same regardless of it being called through .ioctl or .unlocked_ioctl, we need to convert it all to the long return type of unlocked_ioctl. Thanks to Jean-Francois Moine for posting an initial patch for this and thus bringing it to our attention. Cc: Jean-Francois Moine <moinejf@free.fr> Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
201 lines
5 KiB
C
201 lines
5 KiB
C
/*
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tea6415c - i2c-driver for the tea6415c by SGS Thomson
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Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
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Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
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The tea6415c is a bus controlled video-matrix-switch
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with 8 inputs and 6 outputs.
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It is cascadable, i.e. it can be found at the addresses
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0x86 and 0x06 on the i2c-bus.
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For detailed informations download the specifications directly
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from SGS Thomson at http://www.st.com
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License vs published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mvss Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/ioctl.h>
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#include <linux/i2c.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-i2c-drv-legacy.h>
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#include "tea6415c.h"
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MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
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MODULE_DESCRIPTION("tea6415c driver");
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MODULE_LICENSE("GPL");
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static int debug;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "Debug level (0-1)");
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/* addresses to scan, found only at 0x03 and/or 0x43 (7-bit) */
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static unsigned short normal_i2c[] = { I2C_TEA6415C_1, I2C_TEA6415C_2, I2C_CLIENT_END };
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/* magic definition of all other variables and things */
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I2C_CLIENT_INSMOD;
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/* makes a connection between the input-pin 'i' and the output-pin 'o'
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for the tea6415c-client 'client' */
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static int switch_matrix(struct i2c_client *client, int i, int o)
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{
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u8 byte = 0;
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int ret;
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v4l_dbg(1, debug, client, "i=%d, o=%d\n", i, o);
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/* check if the pins are valid */
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if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i)
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&& (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o)))
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return -1;
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/* to understand this, have a look at the tea6415c-specs (p.5) */
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switch (o) {
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case 18:
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byte = 0x00;
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break;
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case 14:
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byte = 0x20;
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break;
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case 16:
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byte = 0x10;
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break;
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case 17:
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byte = 0x08;
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break;
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case 15:
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byte = 0x18;
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break;
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case 13:
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byte = 0x28;
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break;
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};
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switch (i) {
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case 5:
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byte |= 0x00;
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break;
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case 8:
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byte |= 0x04;
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break;
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case 3:
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byte |= 0x02;
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break;
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case 20:
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byte |= 0x06;
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break;
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case 6:
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byte |= 0x01;
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break;
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case 10:
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byte |= 0x05;
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break;
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case 1:
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byte |= 0x03;
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break;
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case 11:
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byte |= 0x07;
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break;
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};
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ret = i2c_smbus_write_byte(client, byte);
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if (ret) {
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v4l_dbg(1, debug, client,
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"i2c_smbus_write_byte() failed, ret:%d\n", ret);
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return -EIO;
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}
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return ret;
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}
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static long tea6415c_ioctl(struct v4l2_subdev *sd, unsigned cmd, void *arg)
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{
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if (cmd == TEA6415C_SWITCH) {
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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struct tea6415c_multiplex *v = (struct tea6415c_multiplex *)arg;
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return switch_matrix(client, v->in, v->out);
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}
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return -ENOIOCTLCMD;
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}
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static int tea6415c_command(struct i2c_client *client, unsigned cmd, void *arg)
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{
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return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
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}
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/* ----------------------------------------------------------------------- */
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static const struct v4l2_subdev_core_ops tea6415c_core_ops = {
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.ioctl = tea6415c_ioctl,
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};
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static const struct v4l2_subdev_ops tea6415c_ops = {
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.core = &tea6415c_core_ops,
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};
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/* this function is called by i2c_probe */
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static int tea6415c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct v4l2_subdev *sd;
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/* let's see whether this adapter can support what we need */
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE))
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return 0;
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v4l_info(client, "chip found @ 0x%x (%s)\n",
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client->addr << 1, client->adapter->name);
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sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
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if (sd == NULL)
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return -ENOMEM;
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v4l2_i2c_subdev_init(sd, client, &tea6415c_ops);
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return 0;
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}
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static int tea6415c_remove(struct i2c_client *client)
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{
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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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v4l2_device_unregister_subdev(sd);
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kfree(sd);
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return 0;
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}
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static int tea6415c_legacy_probe(struct i2c_adapter *adapter)
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{
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/* Let's see whether this is a known adapter we can attach to.
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Prevents conflicts with tvaudio.c. */
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return adapter->id == I2C_HW_SAA7146;
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}
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static const struct i2c_device_id tea6415c_id[] = {
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{ "tea6415c", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tea6415c_id);
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static struct v4l2_i2c_driver_data v4l2_i2c_data = {
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.name = "tea6415c",
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.driverid = I2C_DRIVERID_TEA6415C,
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.command = tea6415c_command,
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.probe = tea6415c_probe,
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.remove = tea6415c_remove,
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.legacy_probe = tea6415c_legacy_probe,
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.id_table = tea6415c_id,
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};
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