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linux/drivers/media/i2c/tda7432.c

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/*
* For the STS-Thompson TDA7432 audio processor chip
*
* Handles audio functions: volume, balance, tone, loudness
* This driver will not complain if used with any
* other i2c device with the same address.
*
* Muting and tone control by Jonathan Isom <jisom@ematic.com>
*
* Copyright (c) 2000 Eric Sandeen <eric_sandeen@bigfoot.com>
* Copyright (c) 2006 Mauro Carvalho Chehab <mchehab@infradead.org>
* This code is placed under the terms of the GNU General Public License
* Based on tda9855.c by Steve VanDeBogart (vandebo@uclink.berkeley.edu)
* Which was based on tda8425.c by Greg Alexander (c) 1998
*
* OPTIONS:
* debug - set to 1 if you'd like to see debug messages
* set to 2 if you'd like to be inundated with debug messages
*
* loudness - set between 0 and 15 for varying degrees of loudness effect
*
* maxvol - set maximium volume to +20db (1), default is 0db(0)
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/i2c.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
#include <media/i2c-addr.h>
#ifndef VIDEO_AUDIO_BALANCE
# define VIDEO_AUDIO_BALANCE 32
#endif
MODULE_AUTHOR("Eric Sandeen <eric_sandeen@bigfoot.com>");
MODULE_DESCRIPTION("bttv driver for the tda7432 audio processor chip");
MODULE_LICENSE("GPL");
static int maxvol;
static int loudness; /* disable loudness by default */
static int debug; /* insmod parameter */
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Set debugging level from 0 to 3. Default is off(0).");
module_param(loudness, int, S_IRUGO);
MODULE_PARM_DESC(loudness, "Turn loudness on(1) else off(0). Default is off(0).");
module_param(maxvol, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(maxvol, "Set maximium volume to +20dB(0) else +0dB(1). Default is +20dB(0).");
/* Structure of address and subaddresses for the tda7432 */
struct tda7432 {
struct v4l2_subdev sd;
struct v4l2_ctrl_handler hdl;
struct {
/* bass/treble cluster */
struct v4l2_ctrl *bass;
struct v4l2_ctrl *treble;
};
struct {
/* mute/balance cluster */
struct v4l2_ctrl *mute;
struct v4l2_ctrl *balance;
};
};
static inline struct tda7432 *to_state(struct v4l2_subdev *sd)
{
return container_of(sd, struct tda7432, sd);
}
static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
{
return &container_of(ctrl->handler, struct tda7432, hdl)->sd;
}
/* The TDA7432 is made by STS-Thompson
* http://www.st.com
* http://us.st.com/stonline/books/pdf/docs/4056.pdf
*
* TDA7432: I2C-bus controlled basic audio processor
*
* The TDA7432 controls basic audio functions like volume, balance,
* and tone control (including loudness). It also has four channel
* output (for front and rear). Since most vidcap cards probably
* don't have 4 channel output, this driver will set front & rear
* together (no independent control).
*/
/* Subaddresses for TDA7432 */
#define TDA7432_IN 0x00 /* Input select */
#define TDA7432_VL 0x01 /* Volume */
#define TDA7432_TN 0x02 /* Bass, Treble (Tone) */
#define TDA7432_LF 0x03 /* Attenuation LF (Left Front) */
#define TDA7432_LR 0x04 /* Attenuation LR (Left Rear) */
#define TDA7432_RF 0x05 /* Attenuation RF (Right Front) */
#define TDA7432_RR 0x06 /* Attenuation RR (Right Rear) */
#define TDA7432_LD 0x07 /* Loudness */
/* Masks for bits in TDA7432 subaddresses */
/* Many of these not used - just for documentation */
/* Subaddress 0x00 - Input selection and bass control */
/* Bits 0,1,2 control input:
* 0x00 - Stereo input
* 0x02 - Mono input
* 0x03 - Mute (Using Attenuators Plays better with modules)
* Mono probably isn't used - I'm guessing only the stereo
* input is connected on most cards, so we'll set it to stereo.
*
* Bit 3 controls bass cut: 0/1 is non-symmetric/symmetric bass cut
* Bit 4 controls bass range: 0/1 is extended/standard bass range
*
* Highest 3 bits not used
*/
#define TDA7432_STEREO_IN 0
#define TDA7432_MONO_IN 2 /* Probably won't be used */
#define TDA7432_BASS_SYM 1 << 3
#define TDA7432_BASS_NORM 1 << 4
/* Subaddress 0x01 - Volume */
/* Lower 7 bits control volume from -79dB to +32dB in 1dB steps
* Recommended maximum is +20 dB
*
* +32dB: 0x00
* +20dB: 0x0c
* 0dB: 0x20
* -79dB: 0x6f
*
* MSB (bit 7) controls loudness: 1/0 is loudness on/off
*/
#define TDA7432_VOL_0DB 0x20
#define TDA7432_LD_ON 1 << 7
/* Subaddress 0x02 - Tone control */
/* Bits 0,1,2 control absolute treble gain from 0dB to 14dB
* 0x0 is 14dB, 0x7 is 0dB
*
* Bit 3 controls treble attenuation/gain (sign)
* 1 = gain (+)
* 0 = attenuation (-)
*
* Bits 4,5,6 control absolute bass gain from 0dB to 14dB
* (This is only true for normal base range, set in 0x00)
* 0x0 << 4 is 14dB, 0x7 is 0dB
*
* Bit 7 controls bass attenuation/gain (sign)
* 1 << 7 = gain (+)
* 0 << 7 = attenuation (-)
*
* Example:
* 1 1 0 1 0 1 0 1 is +4dB bass, -4dB treble
*/
#define TDA7432_TREBLE_0DB 0xf
#define TDA7432_TREBLE 7
#define TDA7432_TREBLE_GAIN 1 << 3
#define TDA7432_BASS_0DB 0xf
#define TDA7432_BASS 7 << 4
#define TDA7432_BASS_GAIN 1 << 7
/* Subaddress 0x03 - Left Front attenuation */
/* Subaddress 0x04 - Left Rear attenuation */
/* Subaddress 0x05 - Right Front attenuation */
/* Subaddress 0x06 - Right Rear attenuation */
/* Bits 0,1,2,3,4 control attenuation from 0dB to -37.5dB
* in 1.5dB steps.
*
* 0x00 is 0dB
* 0x1f is -37.5dB
*
* Bit 5 mutes that channel when set (1 = mute, 0 = unmute)
* We'll use the mute on the input, though (above)
* Bits 6,7 unused
*/
#define TDA7432_ATTEN_0DB 0x00
#define TDA7432_MUTE 0x1 << 5
/* Subaddress 0x07 - Loudness Control */
/* Bits 0,1,2,3 control loudness from 0dB to -15dB in 1dB steps
* when bit 4 is NOT set
*
* 0x0 is 0dB
* 0xf is -15dB
*
* If bit 4 is set, then there is a flat attenuation according to
* the lower 4 bits, as above.
*
* Bits 5,6,7 unused
*/
/* Begin code */
static int tda7432_write(struct v4l2_subdev *sd, int subaddr, int val)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
unsigned char buffer[2];
v4l2_dbg(2, debug, sd, "In tda7432_write\n");
v4l2_dbg(1, debug, sd, "Writing %d 0x%x\n", subaddr, val);
buffer[0] = subaddr;
buffer[1] = val;
if (2 != i2c_master_send(client, buffer, 2)) {
v4l2_err(sd, "I/O error, trying (write %d 0x%x)\n",
subaddr, val);
return -1;
}
return 0;
}
static int tda7432_set(struct v4l2_subdev *sd)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
unsigned char buf[16];
buf[0] = TDA7432_IN;
buf[1] = TDA7432_STEREO_IN | /* Main (stereo) input */
TDA7432_BASS_SYM | /* Symmetric bass cut */
TDA7432_BASS_NORM; /* Normal bass range */
buf[2] = 0x3b;
if (loudness) /* Turn loudness on? */
buf[2] |= TDA7432_LD_ON;
buf[3] = TDA7432_TREBLE_0DB | (TDA7432_BASS_0DB << 4);
buf[4] = TDA7432_ATTEN_0DB;
buf[5] = TDA7432_ATTEN_0DB;
buf[6] = TDA7432_ATTEN_0DB;
buf[7] = TDA7432_ATTEN_0DB;
buf[8] = loudness;
if (9 != i2c_master_send(client, buf, 9)) {
v4l2_err(sd, "I/O error, trying tda7432_set\n");
return -1;
}
return 0;
}
static int tda7432_log_status(struct v4l2_subdev *sd)
{
struct tda7432 *state = to_state(sd);
v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
return 0;
}
static int tda7432_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct v4l2_subdev *sd = to_sd(ctrl);
struct tda7432 *t = to_state(sd);
u8 bass, treble, volume;
u8 lf, lr, rf, rr;
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
if (t->balance->val < 0) {
/* shifted to left, attenuate right */
rr = rf = -t->balance->val;
lr = lf = TDA7432_ATTEN_0DB;
} else if (t->balance->val > 0) {
/* shifted to right, attenuate left */
rr = rf = TDA7432_ATTEN_0DB;
lr = lf = t->balance->val;
} else {
/* centered */
rr = rf = TDA7432_ATTEN_0DB;
lr = lf = TDA7432_ATTEN_0DB;
}
if (t->mute->val) {
lf |= TDA7432_MUTE;
lr |= TDA7432_MUTE;
lf |= TDA7432_MUTE;
rr |= TDA7432_MUTE;
}
/* Mute & update balance*/
tda7432_write(sd, TDA7432_LF, lf);
tda7432_write(sd, TDA7432_LR, lr);
tda7432_write(sd, TDA7432_RF, rf);
tda7432_write(sd, TDA7432_RR, rr);
return 0;
case V4L2_CID_AUDIO_VOLUME:
volume = 0x6f - ctrl->val;
if (loudness) /* Turn on the loudness bit */
volume |= TDA7432_LD_ON;
tda7432_write(sd, TDA7432_VL, volume);
return 0;
case V4L2_CID_AUDIO_BASS:
bass = t->bass->val;
treble = t->treble->val;
if (bass >= 0x8)
bass = 14 - (bass - 8);
if (treble >= 0x8)
treble = 14 - (treble - 8);
tda7432_write(sd, TDA7432_TN, 0x10 | (bass << 4) | treble);
return 0;
}
return -EINVAL;
}
/* ----------------------------------------------------------------------- */
static const struct v4l2_ctrl_ops tda7432_ctrl_ops = {
.s_ctrl = tda7432_s_ctrl,
};
static const struct v4l2_subdev_core_ops tda7432_core_ops = {
.log_status = tda7432_log_status,
.g_ext_ctrls = v4l2_subdev_g_ext_ctrls,
.try_ext_ctrls = v4l2_subdev_try_ext_ctrls,
.s_ext_ctrls = v4l2_subdev_s_ext_ctrls,
.g_ctrl = v4l2_subdev_g_ctrl,
.s_ctrl = v4l2_subdev_s_ctrl,
.queryctrl = v4l2_subdev_queryctrl,
.querymenu = v4l2_subdev_querymenu,
};
static const struct v4l2_subdev_ops tda7432_ops = {
.core = &tda7432_core_ops,
};
/* ----------------------------------------------------------------------- */
/* *********************** *
* i2c interface functions *
* *********************** */
static int tda7432_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct tda7432 *t;
struct v4l2_subdev *sd;
v4l_info(client, "chip found @ 0x%02x (%s)\n",
client->addr << 1, client->adapter->name);
t = devm_kzalloc(&client->dev, sizeof(*t), GFP_KERNEL);
if (!t)
return -ENOMEM;
sd = &t->sd;
v4l2_i2c_subdev_init(sd, client, &tda7432_ops);
v4l2_ctrl_handler_init(&t->hdl, 5);
v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops,
V4L2_CID_AUDIO_VOLUME, 0, maxvol ? 0x68 : 0x4f, 1, maxvol ? 0x5d : 0x47);
t->mute = v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops,
V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
t->balance = v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops,
V4L2_CID_AUDIO_BALANCE, -31, 31, 1, 0);
t->bass = v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops,
V4L2_CID_AUDIO_BASS, 0, 14, 1, 7);
t->treble = v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops,
V4L2_CID_AUDIO_TREBLE, 0, 14, 1, 7);
sd->ctrl_handler = &t->hdl;
if (t->hdl.error) {
int err = t->hdl.error;
v4l2_ctrl_handler_free(&t->hdl);
return err;
}
v4l2_ctrl_cluster(2, &t->bass);
v4l2_ctrl_cluster(2, &t->mute);
v4l2_ctrl_handler_setup(&t->hdl);
if (loudness < 0 || loudness > 15) {
v4l2_warn(sd, "loudness parameter must be between 0 and 15\n");
if (loudness < 0)
loudness = 0;
if (loudness > 15)
loudness = 15;
}
tda7432_set(sd);
return 0;
}
static int tda7432_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
struct tda7432 *t = to_state(sd);
tda7432_set(sd);
v4l2_device_unregister_subdev(sd);
v4l2_ctrl_handler_free(&t->hdl);
return 0;
}
static const struct i2c_device_id tda7432_id[] = {
{ "tda7432", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tda7432_id);
static struct i2c_driver tda7432_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "tda7432",
},
.probe = tda7432_probe,
.remove = tda7432_remove,
.id_table = tda7432_id,
};
module_i2c_driver(tda7432_driver);
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