534 lines
14 KiB
C
534 lines
14 KiB
C
/*
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* For the STS-Thompson TDA7432 audio processor chip
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*
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* Handles audio functions: volume, balance, tone, loudness
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* This driver will not complain if used with any
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* other i2c device with the same address.
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*
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* Muting and tone control by Jonathan Isom <jisom@ematic.com>
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*
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* Copyright (c) 2000 Eric Sandeen <eric_sandeen@bigfoot.com>
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* Copyright (c) 2006 Mauro Carvalho Chehab <mchehab@infradead.org>
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* This code is placed under the terms of the GNU General Public License
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* Based on tda9855.c by Steve VanDeBogart (vandebo@uclink.berkeley.edu)
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* Which was based on tda8425.c by Greg Alexander (c) 1998
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*
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* OPTIONS:
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* debug - set to 1 if you'd like to see debug messages
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* set to 2 if you'd like to be inundated with debug messages
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*
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* loudness - set between 0 and 15 for varying degrees of loudness effect
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*
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* maxvol - set maximium volume to +20db (1), default is 0db(0)
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*
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*
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* Revision: 0.7 - maxvol module parm to set maximium volume 0db or +20db
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* store if muted so we can return it
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* change balance only if flaged to
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* Revision: 0.6 - added tone controls
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* Revision: 0.5 - Fixed odd balance problem
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* Revision: 0.4 - added muting
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* Revision: 0.3 - Fixed silly reversed volume controls. :)
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* Revision: 0.2 - Cleaned up #defines
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* fixed volume control
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* Added I2C_DRIVERID_TDA7432
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* added loudness insmod control
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* Revision: 0.1 - initial version
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/timer.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/videodev.h>
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#include <linux/i2c.h>
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#include <media/v4l2-common.h>
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#include <media/i2c-addr.h>
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#ifndef VIDEO_AUDIO_BALANCE
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# define VIDEO_AUDIO_BALANCE 32
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#endif
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MODULE_AUTHOR("Eric Sandeen <eric_sandeen@bigfoot.com>");
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MODULE_DESCRIPTION("bttv driver for the tda7432 audio processor chip");
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MODULE_LICENSE("GPL");
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static int maxvol;
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static int loudness; /* disable loudness by default */
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static int debug; /* insmod parameter */
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module_param(debug, int, S_IRUGO | S_IWUSR);
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module_param(loudness, int, S_IRUGO);
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MODULE_PARM_DESC(maxvol,"Set maximium volume to +20db (0), default is 0db(1)");
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module_param(maxvol, int, S_IRUGO | S_IWUSR);
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/* Address to scan (I2C address of this chip) */
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static unsigned short normal_i2c[] = {
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I2C_ADDR_TDA7432 >> 1,
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I2C_CLIENT_END,
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};
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I2C_CLIENT_INSMOD;
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/* Structure of address and subaddresses for the tda7432 */
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struct tda7432 {
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int addr;
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int input;
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int volume;
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int muted;
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int bass, treble;
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int lf, lr, rf, rr;
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int loud;
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struct i2c_client c;
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};
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static struct i2c_driver driver;
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static struct i2c_client client_template;
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/* The TDA7432 is made by STS-Thompson
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* http://www.st.com
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* http://us.st.com/stonline/books/pdf/docs/4056.pdf
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*
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* TDA7432: I2C-bus controlled basic audio processor
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*
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* The TDA7432 controls basic audio functions like volume, balance,
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* and tone control (including loudness). It also has four channel
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* output (for front and rear). Since most vidcap cards probably
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* don't have 4 channel output, this driver will set front & rear
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* together (no independent control).
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*/
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/* Subaddresses for TDA7432 */
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#define TDA7432_IN 0x00 /* Input select */
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#define TDA7432_VL 0x01 /* Volume */
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#define TDA7432_TN 0x02 /* Bass, Treble (Tone) */
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#define TDA7432_LF 0x03 /* Attenuation LF (Left Front) */
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#define TDA7432_LR 0x04 /* Attenuation LR (Left Rear) */
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#define TDA7432_RF 0x05 /* Attenuation RF (Right Front) */
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#define TDA7432_RR 0x06 /* Attenuation RR (Right Rear) */
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#define TDA7432_LD 0x07 /* Loudness */
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/* Masks for bits in TDA7432 subaddresses */
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/* Many of these not used - just for documentation */
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/* Subaddress 0x00 - Input selection and bass control */
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/* Bits 0,1,2 control input:
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* 0x00 - Stereo input
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* 0x02 - Mono input
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* 0x03 - Mute (Using Attenuators Plays better with modules)
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* Mono probably isn't used - I'm guessing only the stereo
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* input is connected on most cards, so we'll set it to stereo.
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*
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* Bit 3 controls bass cut: 0/1 is non-symmetric/symmetric bass cut
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* Bit 4 controls bass range: 0/1 is extended/standard bass range
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*
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* Highest 3 bits not used
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*/
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#define TDA7432_STEREO_IN 0
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#define TDA7432_MONO_IN 2 /* Probably won't be used */
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#define TDA7432_BASS_SYM 1 << 3
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#define TDA7432_BASS_NORM 1 << 4
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/* Subaddress 0x01 - Volume */
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/* Lower 7 bits control volume from -79dB to +32dB in 1dB steps
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* Recommended maximum is +20 dB
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*
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* +32dB: 0x00
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* +20dB: 0x0c
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* 0dB: 0x20
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* -79dB: 0x6f
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*
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* MSB (bit 7) controls loudness: 1/0 is loudness on/off
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*/
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#define TDA7432_VOL_0DB 0x20
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#define TDA7432_LD_ON 1 << 7
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/* Subaddress 0x02 - Tone control */
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/* Bits 0,1,2 control absolute treble gain from 0dB to 14dB
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* 0x0 is 14dB, 0x7 is 0dB
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*
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* Bit 3 controls treble attenuation/gain (sign)
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* 1 = gain (+)
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* 0 = attenuation (-)
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*
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* Bits 4,5,6 control absolute bass gain from 0dB to 14dB
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* (This is only true for normal base range, set in 0x00)
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* 0x0 << 4 is 14dB, 0x7 is 0dB
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*
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* Bit 7 controls bass attenuation/gain (sign)
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* 1 << 7 = gain (+)
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* 0 << 7 = attenuation (-)
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*
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* Example:
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* 1 1 0 1 0 1 0 1 is +4dB bass, -4dB treble
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*/
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#define TDA7432_TREBLE_0DB 0xf
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#define TDA7432_TREBLE 7
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#define TDA7432_TREBLE_GAIN 1 << 3
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#define TDA7432_BASS_0DB 0xf
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#define TDA7432_BASS 7 << 4
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#define TDA7432_BASS_GAIN 1 << 7
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/* Subaddress 0x03 - Left Front attenuation */
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/* Subaddress 0x04 - Left Rear attenuation */
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/* Subaddress 0x05 - Right Front attenuation */
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/* Subaddress 0x06 - Right Rear attenuation */
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/* Bits 0,1,2,3,4 control attenuation from 0dB to -37.5dB
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* in 1.5dB steps.
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*
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* 0x00 is 0dB
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* 0x1f is -37.5dB
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*
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* Bit 5 mutes that channel when set (1 = mute, 0 = unmute)
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* We'll use the mute on the input, though (above)
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* Bits 6,7 unused
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*/
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#define TDA7432_ATTEN_0DB 0x00
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#define TDA7432_MUTE 0x1 << 5
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/* Subaddress 0x07 - Loudness Control */
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/* Bits 0,1,2,3 control loudness from 0dB to -15dB in 1dB steps
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* when bit 4 is NOT set
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*
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* 0x0 is 0dB
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* 0xf is -15dB
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*
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* If bit 4 is set, then there is a flat attenuation according to
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* the lower 4 bits, as above.
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*
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* Bits 5,6,7 unused
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*/
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/* Begin code */
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static int tda7432_write(struct i2c_client *client, int subaddr, int val)
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{
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unsigned char buffer[2];
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v4l_dbg(2, debug,client,"In tda7432_write\n");
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v4l_dbg(1, debug,client,"Writing %d 0x%x\n", subaddr, val);
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buffer[0] = subaddr;
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buffer[1] = val;
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if (2 != i2c_master_send(client,buffer,2)) {
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v4l_err(client,"I/O error, trying (write %d 0x%x)\n",
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subaddr, val);
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return -1;
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}
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return 0;
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}
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/* I don't think we ever actually _read_ the chip... */
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static int tda7432_set(struct i2c_client *client)
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{
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struct tda7432 *t = i2c_get_clientdata(client);
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unsigned char buf[16];
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v4l_dbg(2, debug,client,"In tda7432_set\n");
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v4l_dbg(1, debug,client,
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"tda7432: 7432_set(0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x)\n",
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t->input,t->volume,t->bass,t->treble,t->lf,t->lr,t->rf,t->rr,t->loud);
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buf[0] = TDA7432_IN;
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buf[1] = t->input;
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buf[2] = t->volume;
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buf[3] = t->bass;
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buf[4] = t->treble;
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buf[5] = t->lf;
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buf[6] = t->lr;
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buf[7] = t->rf;
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buf[8] = t->rr;
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buf[9] = t->loud;
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if (10 != i2c_master_send(client,buf,10)) {
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v4l_err(client,"I/O error, trying tda7432_set\n");
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return -1;
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}
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return 0;
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}
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static void do_tda7432_init(struct i2c_client *client)
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{
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struct tda7432 *t = i2c_get_clientdata(client);
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v4l_dbg(2, debug,client,"In tda7432_init\n");
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t->input = TDA7432_STEREO_IN | /* Main (stereo) input */
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TDA7432_BASS_SYM | /* Symmetric bass cut */
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TDA7432_BASS_NORM; /* Normal bass range */
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t->volume = 0x3b ; /* -27dB Volume */
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if (loudness) /* Turn loudness on? */
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t->volume |= TDA7432_LD_ON;
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t->muted = 1;
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t->treble = TDA7432_TREBLE_0DB; /* 0dB Treble */
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t->bass = TDA7432_BASS_0DB; /* 0dB Bass */
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t->lf = TDA7432_ATTEN_0DB; /* 0dB attenuation */
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t->lr = TDA7432_ATTEN_0DB; /* 0dB attenuation */
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t->rf = TDA7432_ATTEN_0DB; /* 0dB attenuation */
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t->rr = TDA7432_ATTEN_0DB; /* 0dB attenuation */
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t->loud = loudness; /* insmod parameter */
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tda7432_set(client);
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}
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/* *********************** *
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* i2c interface functions *
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* *********************** */
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static int tda7432_attach(struct i2c_adapter *adap, int addr, int kind)
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{
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struct tda7432 *t;
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struct i2c_client *client;
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t = kzalloc(sizeof *t,GFP_KERNEL);
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if (!t)
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return -ENOMEM;
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client = &t->c;
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memcpy(client,&client_template,sizeof(struct i2c_client));
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client->adapter = adap;
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client->addr = addr;
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i2c_set_clientdata(client, t);
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do_tda7432_init(client);
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i2c_attach_client(client);
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v4l_info(client, "chip found @ 0x%x (%s)\n", addr << 1, adap->name);
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return 0;
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}
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static int tda7432_probe(struct i2c_adapter *adap)
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{
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if (adap->class & I2C_CLASS_TV_ANALOG)
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return i2c_probe(adap, &addr_data, tda7432_attach);
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return 0;
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}
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static int tda7432_detach(struct i2c_client *client)
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{
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struct tda7432 *t = i2c_get_clientdata(client);
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do_tda7432_init(client);
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i2c_detach_client(client);
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kfree(t);
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return 0;
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}
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static int tda7432_get_ctrl(struct i2c_client *client,
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struct v4l2_control *ctrl)
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{
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struct tda7432 *t = i2c_get_clientdata(client);
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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ctrl->value=t->muted;
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return 0;
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case V4L2_CID_AUDIO_VOLUME:
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if (!maxvol){ /* max +20db */
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ctrl->value = ( 0x6f - (t->volume & 0x7F) ) * 630;
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} else { /* max 0db */
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ctrl->value = ( 0x6f - (t->volume & 0x7F) ) * 829;
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}
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return 0;
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case V4L2_CID_AUDIO_BALANCE:
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{
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if ( (t->lf) < (t->rf) )
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/* right is attenuated, balance shifted left */
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ctrl->value = (32768 - 1057*(t->rf));
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else
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/* left is attenuated, balance shifted right */
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ctrl->value = (32768 + 1057*(t->lf));
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return 0;
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}
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case V4L2_CID_AUDIO_BASS:
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{
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/* Bass/treble 4 bits each */
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int bass=t->bass;
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if(bass >= 0x8)
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bass = ~(bass - 0x8) & 0xf;
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ctrl->value = (bass << 12)+(bass << 8)+(bass << 4)+(bass);
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return 0;
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}
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case V4L2_CID_AUDIO_TREBLE:
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{
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int treble=t->treble;
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if(treble >= 0x8)
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treble = ~(treble - 0x8) & 0xf;
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ctrl->value = (treble << 12)+(treble << 8)+(treble << 4)+(treble);
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return 0;
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}
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}
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return -EINVAL;
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}
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static int tda7432_set_ctrl(struct i2c_client *client,
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struct v4l2_control *ctrl)
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{
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struct tda7432 *t = i2c_get_clientdata(client);
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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t->muted=ctrl->value;
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break;
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case V4L2_CID_AUDIO_VOLUME:
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if(!maxvol){ /* max +20db */
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t->volume = 0x6f - ((ctrl->value)/630);
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} else { /* max 0db */
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t->volume = 0x6f - ((ctrl->value)/829);
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}
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if (loudness) /* Turn on the loudness bit */
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t->volume |= TDA7432_LD_ON;
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tda7432_write(client,TDA7432_VL, t->volume);
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return 0;
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case V4L2_CID_AUDIO_BALANCE:
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if (ctrl->value < 32768) {
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/* shifted to left, attenuate right */
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t->rr = (32768 - ctrl->value)/1057;
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t->rf = t->rr;
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t->lr = TDA7432_ATTEN_0DB;
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t->lf = TDA7432_ATTEN_0DB;
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} else if(ctrl->value > 32769) {
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/* shifted to right, attenuate left */
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t->lf = (ctrl->value - 32768)/1057;
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t->lr = t->lf;
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t->rr = TDA7432_ATTEN_0DB;
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t->rf = TDA7432_ATTEN_0DB;
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} else {
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/* centered */
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t->rr = TDA7432_ATTEN_0DB;
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t->rf = TDA7432_ATTEN_0DB;
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t->lf = TDA7432_ATTEN_0DB;
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t->lr = TDA7432_ATTEN_0DB;
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}
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break;
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case V4L2_CID_AUDIO_BASS:
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t->bass = ctrl->value >> 12;
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if(t->bass>= 0x8)
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t->bass = (~t->bass & 0xf) + 0x8 ;
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tda7432_write(client,TDA7432_TN, 0x10 | (t->bass << 4) | t->treble );
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return 0;
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case V4L2_CID_AUDIO_TREBLE:
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t->treble= ctrl->value >> 12;
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if(t->treble>= 0x8)
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t->treble = (~t->treble & 0xf) + 0x8 ;
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tda7432_write(client,TDA7432_TN, 0x10 | (t->bass << 4) | t->treble );
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return 0;
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default:
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return -EINVAL;
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}
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/* Used for both mute and balance changes */
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if (t->muted)
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{
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/* Mute & update balance*/
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tda7432_write(client,TDA7432_LF, t->lf | TDA7432_MUTE);
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tda7432_write(client,TDA7432_LR, t->lr | TDA7432_MUTE);
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tda7432_write(client,TDA7432_RF, t->rf | TDA7432_MUTE);
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tda7432_write(client,TDA7432_RR, t->rr | TDA7432_MUTE);
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} else {
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tda7432_write(client,TDA7432_LF, t->lf);
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tda7432_write(client,TDA7432_LR, t->lr);
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tda7432_write(client,TDA7432_RF, t->rf);
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tda7432_write(client,TDA7432_RR, t->rr);
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}
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return 0;
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}
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static int tda7432_command(struct i2c_client *client,
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unsigned int cmd, void *arg)
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{
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v4l_dbg(2, debug,client,"In tda7432_command\n");
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if (debug>1)
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v4l_i2c_print_ioctl(client,cmd);
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switch (cmd) {
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/* --- v4l ioctls --- */
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/* take care: bttv does userspace copying, we'll get a
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kernel pointer here... */
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case VIDIOC_QUERYCTRL:
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{
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struct v4l2_queryctrl *qc = arg;
|
|
|
|
switch (qc->id) {
|
|
case V4L2_CID_AUDIO_MUTE:
|
|
case V4L2_CID_AUDIO_VOLUME:
|
|
case V4L2_CID_AUDIO_BALANCE:
|
|
case V4L2_CID_AUDIO_BASS:
|
|
case V4L2_CID_AUDIO_TREBLE:
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return v4l2_ctrl_query_fill_std(qc);
|
|
}
|
|
case VIDIOC_S_CTRL:
|
|
return tda7432_set_ctrl(client, arg);
|
|
|
|
case VIDIOC_G_CTRL:
|
|
return tda7432_get_ctrl(client, arg);
|
|
|
|
} /* 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:
|
|
*/
|