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* for the TDA8425 chip (I don't know which cards have this)
* WARNING: THIS DRIVER WILL LOAD WITHOUT COMPLAINTS EVEN IF A DIFFERENT
* CHIP IS AT ADDRESS 0x82 (it relies on i2c to make sure that there is a
* device acknowledging that address)
*
* Copyright (c) 1998 Greg Alexander <galexand@acm.org>
* This code is placed under the terms of the GNU General Public License
* Code liberally copied from msp3400.c, which is by Gerd Knorr
*
* All of this should work, though it would be nice to eventually support
* balance (different left,right values). Also, the chip seems (?) to have
* two stereo inputs, so if someone has this card, could they tell me if the
* second one can be used for anything (i.e., does it have an external input
* that you can't hear even if you set input to composite?)
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/malloc.h>
#include <linux/videodev.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include "bttv.h"
#include "audiochip.h"
/* Addresses to scan */
#define I2C_TDA8425 0x82
static unsigned short normal_i2c[] = {
I2C_TDA8425 >> 1,
I2C_CLIENT_END};
static unsigned short normal_i2c_range[] = {I2C_CLIENT_END};
static unsigned short probe[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short probe_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short ignore[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short ignore_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short force[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
static struct i2c_client_address_data addr_data = {
normal_i2c, normal_i2c_range,
probe, probe_range,
ignore, ignore_range,
force
};
MODULE_PARM(debug,"i");
static int debug = 0; /* insmod parameter */
#define dprintk if (debug) printk
struct tda8425 {
int mode; /* set to AUDIO_{OFF,TUNER,RADIO,EXTERN} */
int stereo;
__u16 left,right;
__u16 bass,treble;
};
static struct i2c_driver driver;
static struct i2c_client client_template;
#define TDA8425_VL 0x00 /* volume left */
#define TDA8425_VR 0x01 /* volume right */
#define TDA8425_BA 0x02 /* bass */
#define TDA8425_TR 0x03 /* treble */
#define TDA8425_S1 0x08 /* switch functions */
/* values for those registers: */
#define TDA8425_S1_OFF 0xEE /* audio off (mute on) */
#define TDA8425_S1_ON 0xCE /* audio on (mute off) - "linear stereo" mode */
/* ******************************** *
* functions for talking to TDA8425 *
* ******************************** */
static int tda8425_write(struct i2c_client *client, int addr, int val)
{
unsigned char buffer[2];
buffer[0] = addr;
buffer[1] = val;
if (2 != i2c_master_send(client,buffer,2)) {
printk(KERN_WARNING "tda8425: I/O error, trying (write %d 0x%x)\n",
addr, val);
return -1;
}
return 0;
}
static void tda8425_set(struct i2c_client *client)
{
struct tda8425 *tda = client->data;
/* mode is ignored today */
dprintk(KERN_DEBUG "tda8425_set(%04x,%04x,%04x,%04x)\n",tda->left>>10,tda->right>>10,tda->bass>>12,tda->treble>>12);
tda8425_write(client, TDA8425_VL, tda->left>>10 |0xC0);
tda8425_write(client, TDA8425_VR, tda->right>>10 |0xC0);
tda8425_write(client, TDA8425_BA, tda->bass>>12 |0xF0);
tda8425_write(client, TDA8425_TR, tda->treble>>12|0xF0);
}
static void do_tda8425_init(struct i2c_client *client)
{
struct tda8425 *tda = client->data;
tda->left=tda->right =61440; /* 0dB */
tda->bass=tda->treble=24576; /* 0dB */
tda->mode=AUDIO_OFF;
tda->stereo=1;
/* left=right=0x27<<10, bass=treble=0x07<<12 */
tda8425_write(client, TDA8425_S1, TDA8425_S1_OFF); /* mute */
tda8425_set(client);
}
static void tda8425_audio(struct i2c_client *client, int mode)
{
struct tda8425 *tda = client->data;
/* valid for AUDIO_TUNER, RADIO, EXTERN, OFF */
dprintk(KERN_DEBUG "tda8425_audio:%d (T,R,E,I,O)\n",mode);
tda->mode=mode;
tda8425_write(client, TDA8425_S1,
(mode==AUDIO_OFF)?TDA8425_S1_OFF:TDA8425_S1_ON);
/* this is the function we'll need to change if it turns out the
* input-selecting capabilities should be used. */
}
/* *********************** *
* i2c interface functions *
* *********************** */
static int tda8425_attach(struct i2c_adapter *adap, int addr,
unsigned short flags, int kind)
{
struct tda8425 *tda;
struct i2c_client *client;
client = kmalloc(sizeof *client,GFP_KERNEL);
if (!client)
return -ENOMEM;
memcpy(client,&client_template,sizeof(struct i2c_client));
client->adapter = adap;
client->addr = addr;
client->data = tda = kmalloc(sizeof *tda,GFP_KERNEL);
if (!tda)
return -ENOMEM;
memset(tda,0,sizeof *tda);
do_tda8425_init(client);
MOD_INC_USE_COUNT;
strcpy(client->name,"TDA8425");
printk(KERN_INFO "tda8425: init\n");
i2c_attach_client(client);
return 0;
}
static int tda8425_probe(struct i2c_adapter *adap)
{
if (adap->id == (I2C_ALGO_BIT | I2C_HW_B_BT848))
return i2c_probe(adap, &addr_data, tda8425_attach);
return 0;
}
static int tda8425_detach(struct i2c_client *client)
{
struct tda8425 *tda = client->data;
do_tda8425_init(client);
i2c_detach_client(client);
kfree(tda);
kfree(client);
MOD_DEC_USE_COUNT;
return 0;
}
static int tda8425_command(struct i2c_client *client,
unsigned int cmd, void *arg)
{
struct tda8425 *tda = client->data;
__u16 *sarg = arg;
switch (cmd) {
case AUDC_SET_RADIO:
tda8425_audio(client,AUDIO_RADIO);
break;
case AUDC_SET_INPUT:
tda8425_audio(client,*sarg);
break;
/* --- v4l ioctls --- */
/* take care: bttv does userspace copying, we'll get a
kernel pointer here... */
case VIDIOCGAUDIO:
{
struct video_audio *va = arg;
va->flags |= VIDEO_AUDIO_VOLUME |
VIDEO_AUDIO_BASS |
VIDEO_AUDIO_TREBLE;
va->volume=MAX(tda->left,tda->right);
va->balance=(32768*MIN(tda->left,tda->right))/
(va->volume ? va->volume : 1);
va->balance=(tda->left<tda->right)?
(65535-va->balance) : va->balance;
va->bass = tda->bass;
va->treble = tda->treble;
break;
}
case VIDIOCSAUDIO:
{
struct video_audio *va = arg;
tda->left = (MIN(65536 - va->balance,32768) *
va->volume) / 32768;
tda->right = (MIN(va->balance,32768) *
va->volume) / 32768;
tda->bass = va->bass;
tda->treble = va->treble;
tda8425_set(client);
break;
}
#if 0
/* --- old, obsolete interface --- */
case AUDC_GET_VOLUME_LEFT:
*sarg = tda->left;
break;
case AUDC_GET_VOLUME_RIGHT:
*sarg = tda->right;
break;
case AUDC_SET_VOLUME_LEFT:
tda->left = *sarg;
tda8425_set(client);
break;
case AUDC_SET_VOLUME_RIGHT:
tda->right = *sarg;
tda8425_set(client);
break;
case AUDC_GET_BASS:
*sarg = tda->bass;
break;
case AUDC_SET_BASS:
tda->bass = *sarg;
tda8425_set(client);
break;
case AUDC_GET_TREBLE:
*sarg = tda->treble;
break;
case AUDC_SET_TREBLE:
tda->treble = *sarg;
tda8425_set(client);
break;
case AUDC_GET_STEREO:
*sarg = tda->stereo?VIDEO_SOUND_STEREO:VIDEO_SOUND_MONO;
break;
case AUDC_SET_STEREO:
tda->stereo=(*sarg==VIDEO_SOUND_MONO)?0:1;
/* TODO: make this write to the TDA9850? */
break;
/* case AUDC_SWITCH_MUTE: someday, maybe -- not a lot of point to
case AUDC_NEWCHANNEL: it and it would require preserving state
case AUDC_GET_DC: huh?? (not used by bttv.c)
*/
#endif
default:
/* nothing */
}
return 0;
}
static struct i2c_driver driver = {
"i2c tda8424 driver",
I2C_DRIVERID_TDA8425,
I2C_DF_NOTIFY,
tda8425_probe,
tda8425_detach,
tda8425_command,
};
static struct i2c_client client_template =
{
"(unset)", /* name */
-1,
0,
0,
NULL,
&driver
};
#ifdef MODULE
int init_module(void)
#else
int tda8425_init(void)
#endif
{
i2c_add_driver(&driver);
return 0;
}
#ifdef MODULE
void cleanup_module(void)
{
i2c_del_driver(&driver);
}
#endif
/*
* Local variables:
* c-basic-offset: 8
* End:
*/
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