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/*
* For the STS-Thompson TDA7432 audio processor chip
*
* Handles audio functions: volume, balance, tone, loudness
* This driver will not complain if used with any
* other i2c device with the same address.
*
* Muting and tone control by Jonathan Isom <jisom@ematic.com>
*
* Copyright (c) 2000 Eric Sandeen <eric_sandeen@bigfoot.com>
* This code is placed under the terms of the GNU General Public License
* Based on tda9855.c by Steve VanDeBogart (vandebo@uclink.berkeley.edu)
* Which was based on tda8425.c by Greg Alexander (c) 1998
*
* OPTIONS:
* debug - set to 1 if you'd like to see debug messages
* set to 2 if you'd like to be inundated with debug messages
*
* loudness - set between 0 and 15 for varying degrees of loudness effect
*
* maxvol - set maximium volume to +20db (1), default is 0db(0)
*
*
* Revision: 0.7 - maxvol module parm to set maximium volume 0db or +20db
* store if muted so we can return it
* change balance only if flaged to
* Revision: 0.6 - added tone controls
* Revision: 0.5 - Fixed odd balance problem
* Revision: 0.4 - added muting
* Revision: 0.3 - Fixed silly reversed volume controls. :)
* Revision: 0.2 - Cleaned up #defines
* fixed volume control
* Added I2C_DRIVERID_TDA7432
* added loudness insmod control
* Revision: 0.1 - initial version
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/videodev.h>
#include <linux/i2c.h>
#include <media/v4l2-common.h>
#include <media/i2c-addr.h>
#ifndef VIDEO_AUDIO_BALANCE
# define VIDEO_AUDIO_BALANCE 32
#endif
MODULE_AUTHOR("Eric Sandeen <eric_sandeen@bigfoot.com>");
MODULE_DESCRIPTION("bttv driver for the tda7432 audio processor chip");
MODULE_LICENSE("GPL");
static int maxvol;
static int loudness; /* disable loudness by default */
static int debug; /* insmod parameter */
module_param(debug, int, S_IRUGO | S_IWUSR);
module_param(loudness, int, S_IRUGO);
MODULE_PARM_DESC(maxvol,"Set maximium volume to +20db (0), default is 0db(1)");
module_param(maxvol, int, S_IRUGO | S_IWUSR);
/* Address to scan (I2C address of this chip) */
static unsigned short normal_i2c[] = {
I2C_ADDR_TDA7432 >> 1,
I2C_CLIENT_END,
};
I2C_CLIENT_INSMOD;
/* Structure of address and subaddresses for the tda7432 */
struct tda7432 {
int addr;
int input;
int volume;
int muted;
int bass, treble;
int lf, lr, rf, rr;
int loud;
struct i2c_client c;
};
static struct i2c_driver driver;
static struct i2c_client client_template;
/* The TDA7432 is made by STS-Thompson
* http://www.st.com
* http://us.st.com/stonline/books/pdf/docs/4056.pdf
*
* TDA7432: I2C-bus controlled basic audio processor
*
* The TDA7432 controls basic audio functions like volume, balance,
* and tone control (including loudness). It also has four channel
* output (for front and rear). Since most vidcap cards probably
* don't have 4 channel output, this driver will set front & rear
* together (no independent control).
*/
/* Subaddresses for TDA7432 */
#define TDA7432_IN 0x00 /* Input select */
#define TDA7432_VL 0x01 /* Volume */
#define TDA7432_TN 0x02 /* Bass, Treble (Tone) */
#define TDA7432_LF 0x03 /* Attenuation LF (Left Front) */
#define TDA7432_LR 0x04 /* Attenuation LR (Left Rear) */
#define TDA7432_RF 0x05 /* Attenuation RF (Right Front) */
#define TDA7432_RR 0x06 /* Attenuation RR (Right Rear) */
#define TDA7432_LD 0x07 /* Loudness */
/* Masks for bits in TDA7432 subaddresses */
/* Many of these not used - just for documentation */
/* Subaddress 0x00 - Input selection and bass control */
/* Bits 0,1,2 control input:
* 0x00 - Stereo input
* 0x02 - Mono input
* 0x03 - Mute (Using Attenuators Plays better with modules)
* Mono probably isn't used - I'm guessing only the stereo
* input is connected on most cards, so we'll set it to stereo.
*
* Bit 3 controls bass cut: 0/1 is non-symmetric/symmetric bass cut
* Bit 4 controls bass range: 0/1 is extended/standard bass range
*
* Highest 3 bits not used
*/
#define TDA7432_STEREO_IN 0
#define TDA7432_MONO_IN 2 /* Probably won't be used */
#define TDA7432_BASS_SYM 1 << 3
#define TDA7432_BASS_NORM 1 << 4
/* Subaddress 0x01 - Volume */
/* Lower 7 bits control volume from -79dB to +32dB in 1dB steps
* Recommended maximum is +20 dB
*
* +32dB: 0x00
* +20dB: 0x0c
* 0dB: 0x20
* -79dB: 0x6f
*
* MSB (bit 7) controls loudness: 1/0 is loudness on/off
*/
#define TDA7432_VOL_0DB 0x20
#define TDA7432_LD_ON 1 << 7
/* Subaddress 0x02 - Tone control */
/* Bits 0,1,2 control absolute treble gain from 0dB to 14dB
* 0x0 is 14dB, 0x7 is 0dB
*
* Bit 3 controls treble attenuation/gain (sign)
* 1 = gain (+)
* 0 = attenuation (-)
*
* Bits 4,5,6 control absolute bass gain from 0dB to 14dB
* (This is only true for normal base range, set in 0x00)
* 0x0 << 4 is 14dB, 0x7 is 0dB
*
* Bit 7 controls bass attenuation/gain (sign)
* 1 << 7 = gain (+)
* 0 << 7 = attenuation (-)
*
* Example:
* 1 1 0 1 0 1 0 1 is +4dB bass, -4dB treble
*/
#define TDA7432_TREBLE_0DB 0xf
#define TDA7432_TREBLE 7
#define TDA7432_TREBLE_GAIN 1 << 3
#define TDA7432_BASS_0DB 0xf
#define TDA7432_BASS 7 << 4
#define TDA7432_BASS_GAIN 1 << 7
/* Subaddress 0x03 - Left Front attenuation */
/* Subaddress 0x04 - Left Rear attenuation */
/* Subaddress 0x05 - Right Front attenuation */
/* Subaddress 0x06 - Right Rear attenuation */
/* Bits 0,1,2,3,4 control attenuation from 0dB to -37.5dB
* in 1.5dB steps.
*
* 0x00 is 0dB
* 0x1f is -37.5dB
*
* Bit 5 mutes that channel when set (1 = mute, 0 = unmute)
* We'll use the mute on the input, though (above)
* Bits 6,7 unused
*/
#define TDA7432_ATTEN_0DB 0x00
#define TDA7432_MUTE 0x1 << 5
/* Subaddress 0x07 - Loudness Control */
/* Bits 0,1,2,3 control loudness from 0dB to -15dB in 1dB steps
* when bit 4 is NOT set
*
* 0x0 is 0dB
* 0xf is -15dB
*
* If bit 4 is set, then there is a flat attenuation according to
* the lower 4 bits, as above.
*
* Bits 5,6,7 unused
*/
/* Begin code */
static int tda7432_write(struct i2c_client *client, int subaddr, int val)
{
unsigned char buffer[2];
v4l_dbg(2, debug,client,"In tda7432_write\n");
v4l_dbg(1, debug,client,"Writing %d 0x%x\n", subaddr, val);
buffer[0] = subaddr;
buffer[1] = val;
if (2 != i2c_master_send(client,buffer,2)) {
v4l_err(client,"I/O error, trying (write %d 0x%x)\n",
subaddr, val);
return -1;
}
return 0;
}
/* I don't think we ever actually _read_ the chip... */
static int tda7432_set(struct i2c_client *client)
{
struct tda7432 *t = i2c_get_clientdata(client);
unsigned char buf[16];
v4l_dbg(2, debug,client,"In tda7432_set\n");
v4l_dbg(1, debug,client,
"tda7432: 7432_set(0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x)\n",
t->input,t->volume,t->bass,t->treble,t->lf,t->lr,t->rf,t->rr,t->loud);
buf[0] = TDA7432_IN;
buf[1] = t->input;
buf[2] = t->volume;
buf[3] = t->bass;
buf[4] = t->treble;
buf[5] = t->lf;
buf[6] = t->lr;
buf[7] = t->rf;
buf[8] = t->rr;
buf[9] = t->loud;
if (10 != i2c_master_send(client,buf,10)) {
v4l_err(client,"I/O error, trying tda7432_set\n");
return -1;
}
return 0;
}
static void do_tda7432_init(struct i2c_client *client)
{
struct tda7432 *t = i2c_get_clientdata(client);
v4l_dbg(2, debug,client,"In tda7432_init\n");
t->input = TDA7432_STEREO_IN | /* Main (stereo) input */
TDA7432_BASS_SYM | /* Symmetric bass cut */
TDA7432_BASS_NORM; /* Normal bass range */
t->volume = 0x3b ; /* -27dB Volume */
if (loudness) /* Turn loudness on? */
t->volume |= TDA7432_LD_ON;
t->muted = VIDEO_AUDIO_MUTE;
t->treble = TDA7432_TREBLE_0DB; /* 0dB Treble */
t->bass = TDA7432_BASS_0DB; /* 0dB Bass */
t->lf = TDA7432_ATTEN_0DB; /* 0dB attenuation */
t->lr = TDA7432_ATTEN_0DB; /* 0dB attenuation */
t->rf = TDA7432_ATTEN_0DB; /* 0dB attenuation */
t->rr = TDA7432_ATTEN_0DB; /* 0dB attenuation */
t->loud = loudness; /* insmod parameter */
tda7432_set(client);
}
/* *********************** *
* i2c interface functions *
* *********************** */
static int tda7432_attach(struct i2c_adapter *adap, int addr, int kind)
{
struct tda7432 *t;
struct i2c_client *client;
t = kzalloc(sizeof *t,GFP_KERNEL);
if (!t)
return -ENOMEM;
client = &t->c;
memcpy(client,&client_template,sizeof(struct i2c_client));
client->adapter = adap;
client->addr = addr;
i2c_set_clientdata(client, t);
do_tda7432_init(client);
i2c_attach_client(client);
v4l_info(client, "chip found @ 0x%x (%s)\n", addr << 1, adap->name);
return 0;
}
static int tda7432_probe(struct i2c_adapter *adap)
{
if (adap->class & I2C_CLASS_TV_ANALOG)
return i2c_probe(adap, &addr_data, tda7432_attach);
return 0;
}
static int tda7432_detach(struct i2c_client *client)
{
struct tda7432 *t = i2c_get_clientdata(client);
do_tda7432_init(client);
i2c_detach_client(client);
kfree(t);
return 0;
}
static int tda7432_command(struct i2c_client *client,
unsigned int cmd, void *arg)
{
struct tda7432 *t = i2c_get_clientdata(client);
v4l_dbg(2, debug,
|