/* * 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 * * Copyright (c) 2000 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 * 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 #include #include #include #include #include #include #include #include #include #include #include #include "bttv.h" #include #include #ifndef VIDEO_AUDIO_BALANCE # define VIDEO_AUDIO_BALANCE 32 #endif MODULE_AUTHOR("Eric Sandeen "); 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_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,client,"In tda7432_write\n"); v4l_dbg(1,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,client,"In tda7432_set\n"); v4l_dbg(1,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,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 = kmalloc(sizeof *t,GFP_KERNEL); if (!t) return -ENOMEM; memset(t,0,sizeof *t); 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,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 = "i2c tda7432 driver", }, .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: */