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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,client,"In tda7432_command\n");

        if (debug>1)

                v4l_i2c_print_ioctl(client,cmd);

        switch (cmd) {

        /* --- v4l ioctls --- */

        /* take care: bttv does userspace copying, we'll get a

           kernel pointer here... */

        /* Query card - scale from TDA7432 settings to V4L settings */

        case VIDIOCGAUDIO:

        {

                struct video_audio *va = arg;

                va->flags |= VIDEO_AUDIO_VOLUME |

                        VIDEO_AUDIO_BASS |

                        VIDEO_AUDIO_TREBLE |

                        VIDEO_AUDIO_MUTABLE;

                if (t->muted)

                        va->flags |= VIDEO_AUDIO_MUTE;

                va->mode |= VIDEO_SOUND_STEREO;

                /* Master volume control

                 * V4L volume is min 0, max 65535

                 * TDA7432 Volume:

                 * Min (-79dB) is 0x6f

                 * Max (+20dB) is 0x07 (630)

                 * Max (0dB) is 0x20 (829)

                 * (Mask out bit 7 of vol - it's for the loudness setting)

                 */

                if (!maxvol){  /* max +20db */

                        va->volume = ( 0x6f - (t->volume & 0x7F) ) * 630;

                } else {       /* max 0db   */

                        va->volume = ( 0x6f - (t->volume & 0x7F) ) * 829;

                }

                /* Balance depends on L,R attenuation

                 * V4L balance is 0 to 65535, middle is 32768

                 * TDA7432 attenuation: min (0dB) is 0, max (-37.5dB) is 0x1f

                 * to scale up to V4L numbers, mult by 1057

                 * attenuation exists for lf, lr, rf, rr

                 * we use only lf and rf (front channels)

                 */

                if ( (t->lf) < (t->rf) )

                        /* right is attenuated, balance shifted left */

                        va->balance = (32768 - 1057*(t->rf));

                else

                        /* left is attenuated, balance shifted right */

                        va->balance = (32768 + 1057*(t->lf));

                /* Bass/treble 4 bits each */

                va->bass=t->bass;

                if(va->bass >= 0x8)

                        va->bass = ~(va->bass - 0x8) & 0xf;

                va->bass = (va->bass << 12)+(va->bass << 8)+(va->bass << 4)+(va->bass);

                va->treble=t->treble;

                if(va->treble >= 0x8)

                        va->treble = ~(va->treble - 0x8) & 0xf;

                va->treble = (va->treble << 12)+(va->treble << 8)+(va->treble << 4)+(va->treble);

                break; /* VIDIOCGAUDIO case */

        }

        /* Set card - scale from V4L settings to TDA7432 settings */

        case VIDIOCSAUDIO:

        {

                struct video_audio *va = arg;

                if(va->flags & VIDEO_AUDIO_VOLUME){

                        if(!maxvol){ /* max +20db */

                                t->volume = 0x6f - ((va->volume)/630);

                        } else {    /* max 0db   */

                                t->volume = 0x6f - ((va->volume)/829);

                        }

                if (loudness)           /* Turn on the loudness bit */

                        t->volume |= TDA7432_LD_ON;

                        tda7432_write(client,TDA7432_VL, t->volume);

                }

                if(va->flags & VIDEO_AUDIO_BASS)

                {

                        t->bass = va->bass >> 12;

                        if(t->bass>= 0x8)

                                        t->bass = (~t->bass & 0xf) + 0x8 ;

                }

                if(va->flags & VIDEO_AUDIO_TREBLE)

                {

                        t->treble= va->treble >> 12;

                        if(t->treble>= 0x8)

                                        t->treble = (~t->treble & 0xf) + 0x8 ;

                }

                if(va->flags & (VIDEO_AUDIO_TREBLE| VIDEO_AUDIO_BASS))

                        tda7432_write(client,TDA7432_TN, 0x10 | (t->bass << 4) | t->treble );

                if(va->flags & VIDEO_AUDIO_BALANCE)     {

                if (va->balance < 32768)

                {

                        /* shifted to left, attenuate right */

                        t->rr = (32768 - va->balance)/1057;

                        t->rf = t->rr;

                        t->lr = TDA7432_ATTEN_0DB;

                        t->lf = TDA7432_ATTEN_0DB;

                }

                else if(va->balance > 32769)

                {

                        /* shifted to right, attenuate left */

                        t->lf = (va->balance - 32768)/1057;

                        t->lr = t->lf;

                        t->rr = TDA7432_ATTEN_0DB;

                        t->rf = TDA7432_ATTEN_0DB;

                }

                else

                {

                        /* centered */

                        t->rr = TDA7432_ATTEN_0DB;

                        t->rf = TDA7432_ATTEN_0DB;

                        t->lf = TDA7432_ATTEN_0DB;

                        t->lr = TDA7432_ATTEN_0DB;

                }

                }

                t->muted=(va->flags & VIDEO_AUDIO_MUTE);

                if (t->muted)

                {

                        /* Mute & update balance*/

                        tda7432_write(client,TDA7432_LF, t->lf | TDA7432_MUTE);

                        tda7432_write(client,TDA7432_LR, t->lr | TDA7432_MUTE);

                        tda7432_write(client,TDA7432_RF, t->rf | TDA7432_MUTE);

                        tda7432_write(client,TDA7432_RR, t->rr | TDA7432_MUTE);

                } else {

                        tda7432_write(client,TDA7432_LF, t->lf);

                        tda7432_write(client,TDA7432_LR, t->lr);

                        tda7432_write(client,TDA7432_RF, t->rf);

                        tda7432_write(client,TDA7432_RR, t->rr);

                }

                break;

        } /* end of VIDEOCSAUDIO case */

        } /* end of (cmd) switch */

        return 0;

}

static struct i2c_driver driver = {

        .driver = {

                .name    = "tda7432",

        },

        .id              = I2C_DRIVERID_TDA7432,

        .attach_adapter  = tda7432_probe,

        .detach_client   = tda7432_detach,

        .command         = tda7432_command,

};

static struct i2c_client client_template =

{

        .name       = "tda7432",

        .driver     = &driver,

};

static int __init tda7432_init(void)

{

        if ( (loudness < 0) || (loudness > 15) ) {

                printk(KERN_ERR "loudness parameter must be between 0 and 15\n");

                return -EINVAL;

        }

        return i2c_add_driver(&driver);

}

static void __exit tda7432_fini(void)

{

        i2c_del_driver(&driver);

}

module_init(tda7432_init);

module_exit(tda7432_fini);

/*

 * Local variables:

 * c-basic-offset: 8

 * End:

 */