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419 lines
11 KiB
419 lines
11 KiB
/*
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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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#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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#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_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 maximium 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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