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/*
tea6415c.h - i2c-driver for the tea6415c by SGS Thomson
Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
The tea6415c is a bus controlled video-matrix-switch
with 8 inputs and 6 outputs.
It is cascadable, i.e. it can be found at the addresses
0x43 and 0x03 on the i2c-bus.
For detailed informations download the specifications directly
from SGS Thomson at http://www.st.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License vs published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mvss Ave, Cambridge, MA 02139, USA.
*/
#include <linux/version.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include "tea6415c.h"
static int debug = 0; /* insmod parameter */
MODULE_PARM(debug,"i");
#define dprintk if (debug) printk
#define TEA6415C_NUM_INPUTS 8
#define TEA6415C_NUM_OUTPUTS 6
/* addresses to scan, found only at 0x03 and/or 0x43 (7-bit) */
static unsigned short normal_i2c[] = {I2C_TEA6415C_1, I2C_TEA6415C_2, I2C_CLIENT_END};
static unsigned short normal_i2c_range[] = {I2C_CLIENT_END};
/* magic definition of all other variables and things */
I2C_CLIENT_INSMOD;
static struct i2c_driver driver;
/* unique ID allocation */
static int tea6415c_id = 0;
/* this function is called by i2c_probe */
static int tea6415c_detect(struct i2c_adapter *adapter, int address, unsigned short flags, int kind)
{
struct i2c_client *client = 0;
int err = 0;
/* let's see whether this adapter can support what we need */
if ( 0 == i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) {
return 0;
}
/* allocate memory for client structure */
client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
if (0 == client) {
return -ENOMEM;
}
memset(client, 0, sizeof(struct i2c_client));
/* fill client structure */
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
sprintf(client->name,"tea6415c (0x%02x)", address);
#else
sprintf(client->dev.name,"tea6415c (0x%02x)", address);
#endif
client->id = tea6415c_id++;
client->flags = 0;
client->addr = address;
client->adapter = adapter;
client->driver = &driver;
/* tell the i2c layer a new client has arrived */
if (0 != (err = i2c_attach_client(client))) {
kfree(client);
return err;
}
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
printk("tea6415c.o: detected @ 0x%02x on adapter %s\n",address,&client->adapter->name[0]);
#else
printk("tea6415c.o: detected @ 0x%02x on adapter %s\n",address,&client->adapter->dev.name[0]);
#endif
return 0;
}
static int tea6415c_attach(struct i2c_adapter *adapter)
{
/* let's see whether this is a know adapter we can attach to */
if( adapter->id != I2C_ALGO_SAA7146 ) {
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
dprintk("tea6415c.o: refusing to probe on unknown adapter [name='%s',id=0x%x]\n",adapter->name,adapter->id);
#else
dprintk("tea6415c.o: refusing to probe on unknown adapter [name='%s',id=0x%x]\n",adapter->dev.name,adapter->id);
#endif
return -ENODEV;
}
return i2c_probe(adapter,&addr_data,&tea6415c_detect);
}
static int tea6415c_detach(struct i2c_client *client)
{
int err = 0;
if ( 0 != (err = i2c_detach_client(client))) {
printk("tea6415c.o: Client deregistration failed, client not detached.\n");
return err;
}
kfree(client);
return 0;
}
/* makes a connection between the input-pin 'i' and the output-pin 'o'
for the tea6415c-client 'client' */
static int tea6415c_switch(struct i2c_client *client, int i, int o)
{
u8 byte = 0;
dprintk("tea6415c.o: tea6415c_switch: adr:0x%02x, i:%d, o:%d\n", client->addr, i, o);
/* check if the pins are valid */
if ( 0 == (( 1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i ) &&
(18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o )))
return -1;
/* to understand this, have a look at the tea6415c-specs (p.5) */
switch(o) {
case 18:
byte = 0x00;
break;
case 14:
byte = 0x20;
break;
case 16:
byte = 0x10;
break;
case 17:
byte = 0x08;
break;
case 15:
byte = 0x18;
break;
case 13:
byte = 0x28;
break;
};
switch(i) {
case 5:
byte |= 0x00;
break;
case 8:
byte |= 0x04;
break;
case 3:
byte |= 0x02;
break;
case 20:
byte |= 0x06;
break;
case 6:
byte |= 0x01;
break;
case 10:
byte |= 0x05;
break;
case 1:
byte |= 0x03;
break;
case 11:
byte |= 0x07;
break;
};
if ( 0 != i2c_smbus_write_byte(client,byte)) {
dprintk("tea6415c.o: tea6415c_switch: could not write to tea6415c\n");
return -1;
}
return 0;
}
static int tea6415c_command(struct i2c_client *client, unsigned int cmd, void* arg)
{
struct tea6415c_multiplex *v = (struct tea6415c_multiplex*)arg;
int result = 0;
switch (cmd) {
case TEA6415C_SWITCH: {
result = tea6415c_switch(client,v->in,v->out);
break;
}
default: {
return -ENOIOCTLCMD;
}
}
if ( 0 != result )
return result;
return 0;
}
static struct i2c_driver driver = {
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,5,54)
.owner = THIS_MODULE,
#endif
.name = "tea6415c driver",
.id = I2C_DRIVERID_TEA6415C,
.flags = I2C_DF_NOTIFY,
.attach_adapter = tea6415c_attach,
.detach_client = tea6415c_detach,
.command = tea6415c_command,
};
static int tea6415c_init_module(void)
{
i2c_add_driver(&driver);
return 0;
}
static void tea6415c_cleanup_module(void)
{
i2c_del_driver(&driver);
}
module_init(tea6415c_init_module);
module_exit(tea6415c_cleanup_module);
MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
MODULE_DESCRIPTION("tea6415c driver");
MODULE_LICENSE("GPL");
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