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/*

 * For the TDA9875 chip

 * (The TDA9875 is used on the Diamond DTV2000 french version

 * Other cards probably use these chips as well.)

 * This driver will not complain if used with any

 * other i2c device with the same address.

 *

 * Copyright (c) 2000 Guillaume Delvit based on Gerd Knorr source and

 * Eric Sandeen

 * 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

 *

 *  Revision: 0.1 - original version

 */

#include <linux/module.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 <media/v4l2-common.h>

#include <linux/i2c.h>

#include <linux/init.h>

#include <media/i2c-addr.h>

static int debug; /* insmod parameter */

module_param(debug, int, S_IRUGO | S_IWUSR);

MODULE_LICENSE("GPL");

/* Addresses to scan */

static unsigned short normal_i2c[] =  {

    I2C_ADDR_TDA9875 >> 1,

    I2C_CLIENT_END

};

I2C_CLIENT_INSMOD;

/* This is a superset of the TDA9875 */

struct tda9875 {

        int rvol, lvol;

        int bass, treble;

        struct i2c_client c;

};

static struct i2c_driver driver;

static struct i2c_client client_template;

#define dprintk  if (debug) printk

/* The TDA9875 is made by Philips Semiconductor

 * http://www.semiconductors.philips.com

 * TDA9875: I2C-bus controlled DSP audio processor, FM demodulator

 *

 */

                /* subaddresses for TDA9875 */

#define TDA9875_MUT         0x12  /*General mute  (value --> 0b11001100*/

#define TDA9875_CFG         0x01  /* Config register (value --> 0b00000000 */

#define TDA9875_DACOS       0x13  /*DAC i/o select (ADC) 0b0000100*/

#define TDA9875_LOSR        0x16  /*Line output select regirter 0b0100 0001*/

#define TDA9875_CH1V        0x0c  /*Channel 1 volume (mute)*/

#define TDA9875_CH2V        0x0d  /*Channel 2 volume (mute)*/

#define TDA9875_SC1         0x14  /*SCART 1 in (mono)*/

#define TDA9875_SC2         0x15  /*SCART 2 in (mono)*/

#define TDA9875_ADCIS       0x17  /*ADC input select (mono) 0b0110 000*/

#define TDA9875_AER         0x19  /*Audio effect (AVL+Pseudo) 0b0000 0110*/

#define TDA9875_MCS         0x18  /*Main channel select (DAC) 0b0000100*/

#define TDA9875_MVL         0x1a  /* Main volume gauche */

#define TDA9875_MVR         0x1b  /* Main volume droite */

#define TDA9875_MBA         0x1d  /* Main Basse */

#define TDA9875_MTR         0x1e  /* Main treble */

#define TDA9875_ACS         0x1f  /* Auxilary channel select (FM) 0b0000000*/

#define TDA9875_AVL         0x20  /* Auxilary volume gauche */

#define TDA9875_AVR         0x21  /* Auxilary volume droite */

#define TDA9875_ABA         0x22  /* Auxilary Basse */

#define TDA9875_ATR         0x23  /* Auxilary treble */

#define TDA9875_MSR         0x02  /* Monitor select register */

#define TDA9875_C1MSB       0x03  /* Carrier 1 (FM) frequency register MSB */

#define TDA9875_C1MIB       0x04  /* Carrier 1 (FM) frequency register (16-8]b */

#define TDA9875_C1LSB       0x05  /* Carrier 1 (FM) frequency register LSB */

#define TDA9875_C2MSB       0x06  /* Carrier 2 (nicam) frequency register MSB */

#define TDA9875_C2MIB       0x07  /* Carrier 2 (nicam) frequency register (16-8]b */

#define TDA9875_C2LSB       0x08  /* Carrier 2 (nicam) frequency register LSB */

#define TDA9875_DCR         0x09  /* Demodulateur configuration regirter*/

#define TDA9875_DEEM        0x0a  /* FM de-emphasis regirter*/

#define TDA9875_FMAT        0x0b  /* FM Matrix regirter*/

/* values */

#define TDA9875_MUTE_ON     0xff /* general mute */

#define TDA9875_MUTE_OFF    0xcc /* general no mute */

/* Begin code */

static int tda9875_write(struct i2c_client *client, int subaddr, unsigned char val)

{

        unsigned char buffer[2];

        dprintk("In tda9875_write\n");

        dprintk("Writing %d 0x%x\n", subaddr, val);

        buffer[0] = subaddr;

        buffer[1] = val;

        if (2 != i2c_master_send(client,buffer,2)) {

                printk(KERN_WARNING "tda9875: I/O error, trying (write %d 0x%x)\n",

                       subaddr, val);

                return -1;

        }

        return 0;

}

static int i2c_read_register(struct i2c_adapter *adap, int addr, int reg)

{

        unsigned char write[1];

        unsigned char read[1];

        struct i2c_msg msgs[2] = {

                { addr, 0,        1, write },

                { addr, I2C_M_RD, 1, read  }

        };

        write[0] = reg;

        if (2 != i2c_transfer(adap,msgs,2)) {

                printk(KERN_WARNING "tda9875: I/O error (read2)\n");

                return -1;

        }

        dprintk("tda9875: chip_read2: reg%d=0x%x\n",reg,read[0]);

        return read[0];

}

static void tda9875_set(struct i2c_client *client)

{

        struct tda9875 *tda = i2c_get_clientdata(client);

        unsigned char a;

        dprintk(KERN_DEBUG "tda9875_set(%04x,%04x,%04x,%04x)\n",

                tda->lvol,tda->rvol,tda->bass,tda->treble);

        a = tda->lvol & 0xff;

        tda9875_write(client, TDA9875_MVL, a);

        a =tda->rvol & 0xff;

        tda9875_write(client, TDA9875_MVR, a);

        a =tda->bass & 0xff;

        tda9875_write(client, TDA9875_MBA, a);

        a =tda->treble  & 0xff;

        tda9875_write(client, TDA9875_MTR, a);

}

static void do_tda9875_init(struct i2c_client *client)

{

        struct tda9875 *t = i2c_get_clientdata(client);

        dprintk("In tda9875_init\n");

        tda9875_write(client, TDA9875_CFG, 0xd0 ); /*reg de config 0 (reset)*/

        tda9875_write(client, TDA9875_MSR, 0x03 );    /* Monitor 0b00000XXX*/

        tda9875_write(client, TDA9875_C1MSB, 0x00 );  /*Car1(FM) MSB XMHz*/

        tda9875_write(client, TDA9875_C1MIB, 0x00 );  /*Car1(FM) MIB XMHz*/

        tda9875_write(client, TDA9875_C1LSB, 0x00 );  /*Car1(FM) LSB XMHz*/

        tda9875_write(client, TDA9875_C2MSB, 0x00 );  /*Car2(NICAM) MSB XMHz*/

        tda9875_write(client, TDA9875_C2MIB, 0x00 );  /*Car2(NICAM) MIB XMHz*/

        tda9875_write(client, TDA9875_C2LSB, 0x00 );  /*Car2(NICAM) LSB XMHz*/

        tda9875_write(client, TDA9875_DCR, 0x00 );    /*Demod config 0x00*/

        tda9875_write(client, TDA9875_DEEM, 0x44 );   /*DE-Emph 0b0100 0100*/

        tda9875_write(client, TDA9875_FMAT, 0x00 );   /*FM Matrix reg 0x00*/

        tda9875_write(client, TDA9875_SC1, 0x00 );    /* SCART 1 (SC1)*/

        tda9875_write(client, TDA9875_SC2, 0x01 );    /* SCART 2 (sc2)*/

        tda9875_write(client, TDA9875_CH1V, 0x10 );  /* Channel volume 1 mute*/

        tda9875_write(client, TDA9875_CH2V, 0x10 );  /* Channel volume 2 mute */

        tda9875_write(client, TDA9875_DACOS, 0x02 ); /* sig DAC i/o(in:nicam)*/

        tda9875_write(client, TDA9875_ADCIS, 0x6f ); /* sig ADC input(in:mono)*/

        tda9875_write(client, TDA9875_LOSR, 0x00 );  /* line out (in:mono)*/

        tda9875_write(client, TDA9875_AER, 0x00 );   /*06 Effect (AVL+PSEUDO) */

        tda9875_write(client, TDA9875_MCS, 0x44 );   /* Main ch select (DAC) */

        tda9875_write(client, TDA9875_MVL, 0x03 );   /* Vol Main left 10dB */

        tda9875_write(client, TDA9875_MVR, 0x03 );   /* Vol Main right 10dB*/

        tda9875_write(client, TDA9875_MBA, 0x00 );   /* Main Bass Main 0dB*/

        tda9875_write(client, TDA9875_MTR, 0x00 );   /* Main Treble Main 0dB*/

        tda9875_write(client, TDA9875_ACS, 0x44 );   /* Aux chan select (dac)*/

        tda9875_write(client, TDA9875_AVL, 0x00 );   /* Vol Aux left 0dB*/

        tda9875_write(client, TDA9875_AVR, 0x00 );   /* Vol Aux right 0dB*/

        tda9875_write(client, TDA9875_ABA, 0x00 );   /* Aux Bass Main 0dB*/

        tda9875_write(client, TDA9875_ATR, 0x00 );   /* Aux Aigus Main 0dB*/

        tda9875_write(client, TDA9875_MUT, 0xcc );   /* General mute  */

        t->lvol=t->rvol =0;      /* 0dB */

        t->bass=0;                       /* 0dB */

        t->treble=0;             /* 0dB */

        tda9875_set(client);

}

/* *********************** *

 * i2c interface functions *

 * *********************** */

static int tda9875_checkit(struct i2c_adapter *adap, int addr)

{

        int dic,rev;

        dic=i2c_read_register(adap,addr,254);

        rev=i2c_read_register(adap,addr,255);

        if(dic==0 || dic==2) { // tda9875 and tda9875A

                printk("tda9875: TDA9875%s Rev.%d detected at 0x%x\n",

                dic==0?"":"A", rev,addr<<1);

                return 1;

        }

        printk("tda9875: no such chip at 0x%x (dic=0x%x rev=0x%x)\n",addr<<1,dic,rev);

        return(0);

}

static int tda9875_attach(struct i2c_adapter *adap, int addr, int kind)

{

        struct tda9875 *t;

        struct i2c_client *client;

        dprintk("In tda9875_attach\n");

        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);

        if(!tda9875_checkit(adap,addr)) {

                kfree(t);

                return 1;

        }

        do_tda9875_init(client);

        printk(KERN_INFO "tda9875: init\n");

        i2c_attach_client(client);

        return 0;

}

static int tda9875_probe(struct i2c_adapter *adap)

{

        if (adap->class & I2C_CLASS_TV_ANALOG)

                return i2c_probe(adap, &addr_data, tda9875_attach);

        return 0;

}

static int tda9875_detach(struct i2c_client *client)

{

        struct tda9875 *t  = i2c_get_clientdata(client);

        do_tda9875_init(client);

        i2c_detach_client(client);

        kfree(t);

        return 0;

}

static int tda9875_command(struct i2c_client *client,

                                unsigned int cmd, void *arg)

{

        struct tda9875 *t = i2c_get_clientdata(client);

        dprintk("In tda9875_command...\n");

        switch (cmd) {

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

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

           kernel pointer here... */

        case VIDIOCGAUDIO:

        {

                struct video_audio *va = arg;

                int left,right;

                dprintk("VIDIOCGAUDIO\n");

                va->flags |= VIDEO_AUDIO_VOLUME |

                        VIDEO_AUDIO_BASS |

                        VIDEO_AUDIO_TREBLE;

                /* min is -84 max is 24 */

                left = (t->lvol+84)*606;

                right = (t->rvol+84)*606;

                va->volume=max(left,right);

                va->balance=(32768*min(left,right))/

                        (va->volume ? va->volume : 1);

                va->balance=(left<right)?

                        (65535-va->balance) : va->balance;

                va->bass = (t->bass+12)*2427;    /* min -12 max +15 */

                va->treble = (t->treble+12)*2730;/* min -12 max +12 */

                va->mode |= VIDEO_SOUND_MONO;

                break; /* VIDIOCGAUDIO case */

        }

        case VIDIOCSAUDIO:

        {

                struct video_audio *va = arg;

                int left,right;

                dprintk("VIDEOCSAUDIO...\n");

                left = (min(65536 - va->balance,32768) *

                        va->volume) / 32768;

                right = (min(va->balance,(__u16)32768) *

                         va->volume) / 32768;

                t->lvol = ((left/606)-84) & 0xff;

                if (t->lvol > 24)

                 t->lvol = 24;

                if (t->lvol < -84)

                 t->lvol = -84 & 0xff;

                t->rvol = ((right/606)-84) & 0xff;

                if (t->rvol > 24)

                 t->rvol = 24;

                if (t->rvol < -84)

                 t->rvol = -84 & 0xff;

                t->bass = ((va->bass/2400)-12) & 0xff;

                if (t->bass > 15)

                 t->bass = 15;

                if (t->bass < -12)

                 t->bass = -12 & 0xff;

                t->treble = ((va->treble/2700)-12) & 0xff;

                if (t->treble > 12)

                 t->treble = 12;

                if (t->treble < -12)

                 t->treble = -12 & 0xff;

//printk("tda9875 bal:%04x vol:%04x bass:%04x treble:%04x\n",va->balance,va->volume,va->bass,va->treble);

                tda9875_set(client);

                break;

        } /* end of VIDEOCSAUDIO case */

        default: /* Not VIDEOCGAUDIO or VIDEOCSAUDIO */

                /* nothing */

                dprintk("Default\n");

        } /* end of (cmd) switch */

        return 0;

}

static struct i2c_driver driver = {

        .driver = {

                .name   = "tda9875",

        },

        .id             = I2C_DRIVERID_TDA9875,

        .attach_adapter = tda9875_probe,

        .detach_client  = tda9875_detach,

        .command        = tda9875_command,

};

static struct i2c_client client_template =

{

        .name      = "tda9875",

        .driver    = &driver,

};

static int __init tda9875_init(void)

{

        return i2c_add_driver(&driver);

}

static void __exit tda9875_fini(void)

{

        i2c_del_driver(&driver);

}

module_init(tda9875_init);

module_exit(tda9875_fini);

/*

 * Local variables:

 * c-basic-offset: 8

 * End:

 */