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/*
tda9840.h - i2c-driver for the tda9840 by SGS Thomson
Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
The tda9840 is a stereo/dual sound processor with digital
identification. It can be found at address 0x84 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 as 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 Mass 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 "tda9840.h"
static int debug = 0; /* insmod parameter */
MODULE_PARM(debug,"i");
#define dprintk if (debug) printk
#define SWITCH 0x00
#define LEVEL_ADJUST 0x02
#define STEREO_ADJUST 0x03
#define TEST 0x04
/* addresses to scan, found only at 0x42 (7-Bit) */
static unsigned short normal_i2c[] = {I2C_TDA9840, I2C_CLIENT_END};
static unsigned short normal_i2c_range[] = {I2C_CLIENT_END};
/* magic definition of all other variables and things */
I2C_CLIENT_INSMOD;
/* unique ID allocation */
static int tda9840_id = 0;
static struct i2c_driver driver;
static int tda9840_command(struct i2c_client *client, unsigned int cmd, void* arg)
{
int result = 0;
switch (cmd) {
case TDA9840_SWITCH:
{
int byte = *(int*)arg;
dprintk("tda9840.o: TDA9840_SWITCH: 0x%02x\n",byte);
if ( byte != TDA9840_SET_MONO
&& byte != TDA9840_SET_MUTE
&& byte != TDA9840_SET_STEREO
&& byte != TDA9840_SET_LANG1
&& byte != TDA9840_SET_LANG2
&& byte != TDA9840_SET_BOTH
&& byte != TDA9840_SET_BOTH_R
&& byte != TDA9840_SET_EXTERNAL ) {
return -EINVAL;
}
if ( 0 != (result = i2c_smbus_write_byte_data(client, SWITCH, byte))) {
printk("tda9840.o: TDA9840_SWITCH error.\n");
return -EFAULT;
}
return 0;
}
case TDA9840_LEVEL_ADJUST:
{
int byte = *(int*)arg;
dprintk("tda9840.o: TDA9840_LEVEL_ADJUST: %d\n",byte);
/* check for correct range */
if ( byte > 25 || byte < -20 )
return -EINVAL;
/* calculate actual value to set, see specs, page 18 */
byte /= 5;
if ( 0 < byte )
byte += 0x8;
else
byte = -byte;
if ( 0 != (result = i2c_smbus_write_byte_data(client, LEVEL_ADJUST, byte))) {
printk("tda9840.o: TDA9840_LEVEL_ADJUST error.\n");
return -EFAULT;
}
return 0;
}
case TDA9840_STEREO_ADJUST:
{
int byte = *(int*)arg;
dprintk("tda9840.o: TDA9840_STEREO_ADJUST: %d\n",byte);
/* check for correct range */
if ( byte > 25 || byte < -24 )
return -EINVAL;
/* calculate actual value to set */
byte /= 5;
if ( 0 < byte )
byte += 0x20;
else
byte = -byte;
if ( 0 != (result = i2c_smbus_write_byte_data(client, STEREO_ADJUST, byte))) {
printk("tda9840.o: TDA9840_STEREO_ADJUST error.\n");
return -EFAULT;
}
return 0;
}
case TDA9840_DETECT:
{
int byte = 0x0;
if ( -1 == (byte = i2c_smbus_read_byte_data(client, STEREO_ADJUST))) {
printk("tda9840.o: TDA9840_DETECT error while reading.\n");
return -EFAULT;
}
if( 0 != (byte & 0x80)) {
dprintk("tda9840.o: TDA9840_DETECT, register contents invalid.\n");
return -EFAULT;
}
dprintk("tda9840.o: TDA9840_DETECT, result: 0x%02x (original byte)\n",byte);
return ((byte & 0x60) >> 5);
}
case TDA9840_TEST:
{
int byte = *(int*)arg;
dprintk("tda9840.o: TDA9840_TEST: 0x%02x\n",byte);
/* mask out irrelevant bits */
byte &= 0x3;
if ( 0 != (result = i2c_smbus_write_byte_data(client, TEST, byte))) {
printk("tda9840.o: TDA9840_TEST error.\n");
return -EFAULT;
}
return 0;
}
default:
return -ENOIOCTLCMD;
}
return 0;
}
static int tda9840_detect(struct i2c_adapter *adapter, int address, unsigned short flags, int kind)
{
struct i2c_client *client;
int result = 0;
int byte = 0x0;
/* let's see whether this adapter can support what we need */
if ( 0 == i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA|I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
return 0;
}
/* allocate memory for client structure */
client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
if (0 == client) {
printk("tda9840.o: not enough kernel memory.\n");
return -ENOMEM;
}
/* fill client structure */
sprintf(client->name,"tda9840 (0x%02x)", address);
client->id = tda9840_id++;
client->flags = 0;
client->addr = address;
client->adapter = adapter;
client->driver = &driver;
client->data = NULL;
/* tell the i2c layer a new client has arrived */
if (0 != (result = i2c_attach_client(client))) {
kfree(client);
return result;
}
/* set initial values for level & stereo - adjustment, mode */
byte = 0;
if ( 0 != (result = tda9840_command(client, TDA9840_LEVEL_ADJUST, &byte))) {
printk("tda9840.o: could not initialize ic #1. continuing anyway. (result:%d)\n",result);
}
if ( 0 != (result = tda9840_command(client, TDA9840_STEREO_ADJUST, &byte))) {
printk("tda9840.o: could not initialize ic #2. continuing anyway. (result:%d)\n",result);
}
byte = TDA9840_SET_MONO;
if ( 0 != (result = tda9840_command(client, TDA9840_SWITCH, &byte))) {
printk("tda9840.o: could not initialize ic #3. continuing anyway. (result:%d)\n",result);
}
printk("tda9840.o: detected @ 0x%02x on adapter %s\n",2*address,&client->adapter->name[0]);
return 0;
}
static int tda9840_attach(struct i2c_adapter *adapter)
{
/* let's see whether this is a know adapter we can attach to */
if( adapter->id != I2C_ALGO_SAA7146 ) {
dprintk("tda9840.o: refusing to probe on unknown adapter [name='%s',id=0x%x]\n",adapter->name,adapter->id);
return -ENODEV;
}
return i2c_probe(adapter,&addr_data,&tda9840_detect);
}
static int tda9840_detach(struct i2c_client *client)
{
int err = 0;
if ( 0 != (err = i2c_detach_client(client))) {
printk("tda9840.o: Client deregistration failed, client not detached.\n");
return err;
}
kfree(client);
return 0;
}
static struct i2c_driver driver = {
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,5,54)
.owner = THIS_MODULE,
#endif
.name = "tda9840 driver",
.id = I2C_DRIVERID_TDA9840,
.flags = I2C_DF_NOTIFY,
.attach_adapter = tda9840_attach,
.detach_client = tda9840_detach,
.command = tda9840_command,
};
static int tda9840_init_module(void)
{
i2c_add_driver(&driver);
return 0;
}
static void tda9840_cleanup_module(void)
{
i2c_del_driver(&driver);
}
module_init(tda9840_init_module);
module_exit(tda9840_cleanup_module);
MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
MODULE_DESCRIPTION("tda9840 driver");
MODULE_LICENSE("GPL");
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