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419 lines
11 KiB
419 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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 <[email protected]> |
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* |
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* Copyright (c) 2000 Eric Sandeen <[email protected]> |
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* Copyright (c) 2006 Mauro Carvalho Chehab <[email protected]> |
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* |
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* Based on tda9855.c by Steve VanDeBogart ([email protected]) |
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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 maximum volume to +20db (1), default is 0db(0) |
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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/videodev2.h> |
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#include <linux/i2c.h> |
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#include <media/v4l2-device.h> |
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#include <media/v4l2-ioctl.h> |
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#include <media/v4l2-ctrls.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 <[email protected]>"); |
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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_PARM_DESC(debug, "Set debugging level from 0 to 3. Default is off(0)."); |
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module_param(loudness, int, S_IRUGO); |
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MODULE_PARM_DESC(loudness, "Turn loudness on(1) else off(0). Default is off(0)."); |
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module_param(maxvol, int, S_IRUGO | S_IWUSR); |
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MODULE_PARM_DESC(maxvol, "Set maximum volume to +20dB(0) else +0dB(1). Default is +20dB(0)."); |
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/* Structure of address and subaddresses for the tda7432 */ |
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struct tda7432 { |
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struct v4l2_subdev sd; |
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struct v4l2_ctrl_handler hdl; |
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struct { |
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/* bass/treble cluster */ |
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struct v4l2_ctrl *bass; |
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struct v4l2_ctrl *treble; |
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}; |
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struct { |
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/* mute/balance cluster */ |
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struct v4l2_ctrl *mute; |
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struct v4l2_ctrl *balance; |
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}; |
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}; |
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static inline struct tda7432 *to_state(struct v4l2_subdev *sd) |
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{ |
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return container_of(sd, struct tda7432, sd); |
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} |
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static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl) |
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{ |
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return &container_of(ctrl->handler, struct tda7432, hdl)->sd; |
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} |
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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 v4l2_subdev *sd, int subaddr, int val) |
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{ |
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struct i2c_client *client = v4l2_get_subdevdata(sd); |
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unsigned char buffer[2]; |
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v4l2_dbg(2, debug, sd, "In tda7432_write\n"); |
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v4l2_dbg(1, debug, sd, "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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v4l2_err(sd, "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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static int tda7432_set(struct v4l2_subdev *sd) |
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{ |
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struct i2c_client *client = v4l2_get_subdevdata(sd); |
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unsigned char buf[16]; |
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buf[0] = TDA7432_IN; |
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buf[1] = 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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buf[2] = 0x3b; |
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if (loudness) /* Turn loudness on? */ |
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buf[2] |= TDA7432_LD_ON; |
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buf[3] = TDA7432_TREBLE_0DB | (TDA7432_BASS_0DB << 4); |
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buf[4] = TDA7432_ATTEN_0DB; |
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buf[5] = TDA7432_ATTEN_0DB; |
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buf[6] = TDA7432_ATTEN_0DB; |
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buf[7] = TDA7432_ATTEN_0DB; |
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buf[8] = loudness; |
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if (9 != i2c_master_send(client, buf, 9)) { |
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v4l2_err(sd, "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 int tda7432_log_status(struct v4l2_subdev *sd) |
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{ |
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struct tda7432 *state = to_state(sd); |
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v4l2_ctrl_handler_log_status(&state->hdl, sd->name); |
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return 0; |
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} |
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static int tda7432_s_ctrl(struct v4l2_ctrl *ctrl) |
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{ |
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struct v4l2_subdev *sd = to_sd(ctrl); |
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struct tda7432 *t = to_state(sd); |
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u8 bass, treble, volume; |
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u8 lf, lr, rf, rr; |
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switch (ctrl->id) { |
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case V4L2_CID_AUDIO_MUTE: |
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if (t->balance->val < 0) { |
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/* shifted to left, attenuate right */ |
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rr = rf = -t->balance->val; |
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lr = lf = TDA7432_ATTEN_0DB; |
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} else if (t->balance->val > 0) { |
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/* shifted to right, attenuate left */ |
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rr = rf = TDA7432_ATTEN_0DB; |
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lr = lf = t->balance->val; |
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} else { |
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/* centered */ |
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rr = rf = TDA7432_ATTEN_0DB; |
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lr = lf = TDA7432_ATTEN_0DB; |
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} |
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if (t->mute->val) { |
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lf |= TDA7432_MUTE; |
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lr |= TDA7432_MUTE; |
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rf |= TDA7432_MUTE; |
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rr |= TDA7432_MUTE; |
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} |
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/* Mute & update balance*/ |
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tda7432_write(sd, TDA7432_LF, lf); |
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tda7432_write(sd, TDA7432_LR, lr); |
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tda7432_write(sd, TDA7432_RF, rf); |
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tda7432_write(sd, TDA7432_RR, rr); |
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return 0; |
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case V4L2_CID_AUDIO_VOLUME: |
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volume = 0x6f - ctrl->val; |
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if (loudness) /* Turn on the loudness bit */ |
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volume |= TDA7432_LD_ON; |
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tda7432_write(sd, TDA7432_VL, volume); |
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return 0; |
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case V4L2_CID_AUDIO_BASS: |
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bass = t->bass->val; |
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treble = t->treble->val; |
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if (bass >= 0x8) |
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bass = 14 - (bass - 8); |
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if (treble >= 0x8) |
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treble = 14 - (treble - 8); |
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tda7432_write(sd, TDA7432_TN, 0x10 | (bass << 4) | treble); |
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return 0; |
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} |
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return -EINVAL; |
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} |
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/* ----------------------------------------------------------------------- */ |
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static const struct v4l2_ctrl_ops tda7432_ctrl_ops = { |
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.s_ctrl = tda7432_s_ctrl, |
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}; |
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static const struct v4l2_subdev_core_ops tda7432_core_ops = { |
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.log_status = tda7432_log_status, |
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}; |
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static const struct v4l2_subdev_ops tda7432_ops = { |
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.core = &tda7432_core_ops, |
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}; |
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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_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct tda7432 *t; |
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struct v4l2_subdev *sd; |
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v4l_info(client, "chip found @ 0x%02x (%s)\n", |
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client->addr << 1, client->adapter->name); |
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t = devm_kzalloc(&client->dev, sizeof(*t), GFP_KERNEL); |
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if (!t) |
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return -ENOMEM; |
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sd = &t->sd; |
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v4l2_i2c_subdev_init(sd, client, &tda7432_ops); |
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v4l2_ctrl_handler_init(&t->hdl, 5); |
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v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops, |
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V4L2_CID_AUDIO_VOLUME, 0, maxvol ? 0x68 : 0x4f, 1, maxvol ? 0x5d : 0x47); |
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t->mute = v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops, |
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V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0); |
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t->balance = v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops, |
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V4L2_CID_AUDIO_BALANCE, -31, 31, 1, 0); |
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t->bass = v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops, |
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V4L2_CID_AUDIO_BASS, 0, 14, 1, 7); |
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t->treble = v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops, |
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V4L2_CID_AUDIO_TREBLE, 0, 14, 1, 7); |
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sd->ctrl_handler = &t->hdl; |
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if (t->hdl.error) { |
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int err = t->hdl.error; |
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v4l2_ctrl_handler_free(&t->hdl); |
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return err; |
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} |
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v4l2_ctrl_cluster(2, &t->bass); |
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v4l2_ctrl_cluster(2, &t->mute); |
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v4l2_ctrl_handler_setup(&t->hdl); |
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if (loudness < 0 || loudness > 15) { |
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v4l2_warn(sd, "loudness parameter must be between 0 and 15\n"); |
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if (loudness < 0) |
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loudness = 0; |
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if (loudness > 15) |
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loudness = 15; |
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} |
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tda7432_set(sd); |
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return 0; |
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} |
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static int tda7432_remove(struct i2c_client *client) |
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{ |
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struct v4l2_subdev *sd = i2c_get_clientdata(client); |
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struct tda7432 *t = to_state(sd); |
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tda7432_set(sd); |
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v4l2_device_unregister_subdev(sd); |
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v4l2_ctrl_handler_free(&t->hdl); |
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return 0; |
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} |
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static const struct i2c_device_id tda7432_id[] = { |
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{ "tda7432", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, tda7432_id); |
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static struct i2c_driver tda7432_driver = { |
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.driver = { |
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.name = "tda7432", |
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}, |
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.probe = tda7432_probe, |
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.remove = tda7432_remove, |
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.id_table = tda7432_id, |
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}; |
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module_i2c_driver(tda7432_driver);
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