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linux/sound/i2c/tea6330t.c
Takashi Iwai 0da2c47a95 ALSA: i2c: Constify snd_kcontrol_new items 
Most of snd_kcontrol_new definitions are read-only and passed as-is.
Let's declare them as const for further optimization.

There should be no functional changes by this patch.

Link: https://lore.kernel.org/r/20200103081714.9560-35-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2020-01-03 09:24:24 +01:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Routines for control of the TEA6330T circuit via i2c bus
* Sound fader control circuit for car radios by Philips Semiconductors
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*/
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/tea6330t.h>
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Routines for control of the TEA6330T circuit via i2c bus");
MODULE_LICENSE("GPL");
#define TEA6330T_ADDR (0x80>>1) /* fixed address */
#define TEA6330T_SADDR_VOLUME_LEFT 0x00 /* volume left */
#define TEA6330T_SADDR_VOLUME_RIGHT 0x01 /* volume right */
#define TEA6330T_SADDR_BASS 0x02 /* bass control */
#define TEA6330T_SADDR_TREBLE 0x03 /* treble control */
#define TEA6330T_SADDR_FADER 0x04 /* fader control */
#define TEA6330T_MFN 0x20 /* mute control for selected channels */
#define TEA6330T_FCH 0x10 /* select fader channels - front or rear */
#define TEA6330T_SADDR_AUDIO_SWITCH 0x05 /* audio switch */
#define TEA6330T_GMU 0x80 /* mute control, general mute */
#define TEA6330T_EQN 0x40 /* equalizer switchover (0=equalizer-on) */
struct tea6330t {
struct snd_i2c_device *device;
struct snd_i2c_bus *bus;
int equalizer;
int fader;
unsigned char regs[8];
unsigned char mleft, mright;
unsigned char bass, treble;
unsigned char max_bass, max_treble;
};
int snd_tea6330t_detect(struct snd_i2c_bus *bus, int equalizer)
{
int res;
snd_i2c_lock(bus);
res = snd_i2c_probeaddr(bus, TEA6330T_ADDR);
snd_i2c_unlock(bus);
return res;
}
#if 0
static void snd_tea6330t_set(struct tea6330t *tea,
unsigned char addr, unsigned char value)
{
#if 0
printk(KERN_DEBUG "set - 0x%x/0x%x\n", addr, value);
#endif
snd_i2c_write(tea->bus, TEA6330T_ADDR, addr, value, 1);
}
#endif
#define TEA6330T_MASTER_VOLUME(xname, xindex) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
.info = snd_tea6330t_info_master_volume, \
.get = snd_tea6330t_get_master_volume, .put = snd_tea6330t_put_master_volume }
static int snd_tea6330t_info_master_volume(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = 2;
uinfo->value.integer.min = 0;
uinfo->value.integer.max = 43;
return 0;
}
static int snd_tea6330t_get_master_volume(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
snd_i2c_lock(tea->bus);
ucontrol->value.integer.value[0] = tea->mleft - 0x14;
ucontrol->value.integer.value[1] = tea->mright - 0x14;
snd_i2c_unlock(tea->bus);
return 0;
}
static int snd_tea6330t_put_master_volume(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
int change, count, err;
unsigned char bytes[3];
unsigned char val1, val2;
val1 = (ucontrol->value.integer.value[0] % 44) + 0x14;
val2 = (ucontrol->value.integer.value[1] % 44) + 0x14;
snd_i2c_lock(tea->bus);
change = val1 != tea->mleft || val2 != tea->mright;
tea->mleft = val1;
tea->mright = val2;
count = 0;
if (tea->regs[TEA6330T_SADDR_VOLUME_LEFT] != 0) {
bytes[count++] = TEA6330T_SADDR_VOLUME_LEFT;
bytes[count++] = tea->regs[TEA6330T_SADDR_VOLUME_LEFT] = tea->mleft;
}
if (tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] != 0) {
if (count == 0)
bytes[count++] = TEA6330T_SADDR_VOLUME_RIGHT;
bytes[count++] = tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] = tea->mright;
}
if (count > 0) {
if ((err = snd_i2c_sendbytes(tea->device, bytes, count)) < 0)
change = err;
}
snd_i2c_unlock(tea->bus);
return change;
}
#define TEA6330T_MASTER_SWITCH(xname, xindex) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
.info = snd_tea6330t_info_master_switch, \
.get = snd_tea6330t_get_master_switch, .put = snd_tea6330t_put_master_switch }
#define snd_tea6330t_info_master_switch snd_ctl_boolean_stereo_info
static int snd_tea6330t_get_master_switch(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
snd_i2c_lock(tea->bus);
ucontrol->value.integer.value[0] = tea->regs[TEA6330T_SADDR_VOLUME_LEFT] == 0 ? 0 : 1;
ucontrol->value.integer.value[1] = tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] == 0 ? 0 : 1;
snd_i2c_unlock(tea->bus);
return 0;
}
static int snd_tea6330t_put_master_switch(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
int change, err;
unsigned char bytes[3];
unsigned char oval1, oval2, val1, val2;
val1 = ucontrol->value.integer.value[0] & 1;
val2 = ucontrol->value.integer.value[1] & 1;
snd_i2c_lock(tea->bus);
oval1 = tea->regs[TEA6330T_SADDR_VOLUME_LEFT] == 0 ? 0 : 1;
oval2 = tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] == 0 ? 0 : 1;
change = val1 != oval1 || val2 != oval2;
tea->regs[TEA6330T_SADDR_VOLUME_LEFT] = val1 ? tea->mleft : 0;
tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] = val2 ? tea->mright : 0;
bytes[0] = TEA6330T_SADDR_VOLUME_LEFT;
bytes[1] = tea->regs[TEA6330T_SADDR_VOLUME_LEFT];
bytes[2] = tea->regs[TEA6330T_SADDR_VOLUME_RIGHT];
if ((err = snd_i2c_sendbytes(tea->device, bytes, 3)) < 0)
change = err;
snd_i2c_unlock(tea->bus);
return change;
}
#define TEA6330T_BASS(xname, xindex) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
.info = snd_tea6330t_info_bass, \
.get = snd_tea6330t_get_bass, .put = snd_tea6330t_put_bass }
static int snd_tea6330t_info_bass(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = 1;
uinfo->value.integer.min = 0;
uinfo->value.integer.max = tea->max_bass;
return 0;
}
static int snd_tea6330t_get_bass(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
ucontrol->value.integer.value[0] = tea->bass;
return 0;
}
static int snd_tea6330t_put_bass(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
int change, err;
unsigned char bytes[2];
unsigned char val1;
val1 = ucontrol->value.integer.value[0] % (tea->max_bass + 1);
snd_i2c_lock(tea->bus);
tea->bass = val1;
val1 += tea->equalizer ? 7 : 3;
change = tea->regs[TEA6330T_SADDR_BASS] != val1;
bytes[0] = TEA6330T_SADDR_BASS;
bytes[1] = tea->regs[TEA6330T_SADDR_BASS] = val1;
if ((err = snd_i2c_sendbytes(tea->device, bytes, 2)) < 0)
change = err;
snd_i2c_unlock(tea->bus);
return change;
}
#define TEA6330T_TREBLE(xname, xindex) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
.info = snd_tea6330t_info_treble, \
.get = snd_tea6330t_get_treble, .put = snd_tea6330t_put_treble }
static int snd_tea6330t_info_treble(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = 1;
uinfo->value.integer.min = 0;
uinfo->value.integer.max = tea->max_treble;
return 0;
}
static int snd_tea6330t_get_treble(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
ucontrol->value.integer.value[0] = tea->treble;
return 0;
}
static int snd_tea6330t_put_treble(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
int change, err;
unsigned char bytes[2];
unsigned char val1;
val1 = ucontrol->value.integer.value[0] % (tea->max_treble + 1);
snd_i2c_lock(tea->bus);
tea->treble = val1;
val1 += 3;
change = tea->regs[TEA6330T_SADDR_TREBLE] != val1;
bytes[0] = TEA6330T_SADDR_TREBLE;
bytes[1] = tea->regs[TEA6330T_SADDR_TREBLE] = val1;
if ((err = snd_i2c_sendbytes(tea->device, bytes, 2)) < 0)
change = err;
snd_i2c_unlock(tea->bus);
return change;
}
static const struct snd_kcontrol_new snd_tea6330t_controls[] = {
TEA6330T_MASTER_SWITCH("Master Playback Switch", 0),
TEA6330T_MASTER_VOLUME("Master Playback Volume", 0),
TEA6330T_BASS("Tone Control - Bass", 0),
TEA6330T_TREBLE("Tone Control - Treble", 0)
};
static void snd_tea6330_free(struct snd_i2c_device *device)
{
kfree(device->private_data);
}
int snd_tea6330t_update_mixer(struct snd_card *card,
struct snd_i2c_bus *bus,
int equalizer, int fader)
{
struct snd_i2c_device *device;
struct tea6330t *tea;
const struct snd_kcontrol_new *knew;
unsigned int idx;
int err = -ENOMEM;
u8 default_treble, default_bass;
unsigned char bytes[7];
tea = kzalloc(sizeof(*tea), GFP_KERNEL);
if (tea == NULL)
return -ENOMEM;
if ((err = snd_i2c_device_create(bus, "TEA6330T", TEA6330T_ADDR, &device)) < 0) {
kfree(tea);
return err;
}
tea->device = device;
tea->bus = bus;
tea->equalizer = equalizer;
tea->fader = fader;
device->private_data = tea;
device->private_free = snd_tea6330_free;
snd_i2c_lock(bus);
/* turn fader off and handle equalizer */
tea->regs[TEA6330T_SADDR_FADER] = 0x3f;
tea->regs[TEA6330T_SADDR_AUDIO_SWITCH] = equalizer ? 0 : TEA6330T_EQN;
/* initialize mixer */
if (!tea->equalizer) {
tea->max_bass = 9;
tea->max_treble = 8;
default_bass = 3 + 4;
tea->bass = 4;
default_treble = 3 + 4;
tea->treble = 4;
} else {
tea->max_bass = 5;
tea->max_treble = 0;
default_bass = 7 + 4;
tea->bass = 4;
default_treble = 3;
tea->treble = 0;
}
tea->mleft = tea->mright = 0x14;
tea->regs[TEA6330T_SADDR_BASS] = default_bass;
tea->regs[TEA6330T_SADDR_TREBLE] = default_treble;
/* compose I2C message and put the hardware to initial state */
bytes[0] = TEA6330T_SADDR_VOLUME_LEFT;
for (idx = 0; idx < 6; idx++)
bytes[idx+1] = tea->regs[idx];
if ((err = snd_i2c_sendbytes(device, bytes, 7)) < 0)
goto __error;
strcat(card->mixername, ",TEA6330T");
if ((err = snd_component_add(card, "TEA6330T")) < 0)
goto __error;
for (idx = 0; idx < ARRAY_SIZE(snd_tea6330t_controls); idx++) {
knew = &snd_tea6330t_controls[idx];
if (tea->treble == 0 && !strcmp(knew->name, "Tone Control - Treble"))
continue;
if ((err = snd_ctl_add(card, snd_ctl_new1(knew, tea))) < 0)
goto __error;
}
snd_i2c_unlock(bus);
return 0;
__error:
snd_i2c_unlock(bus);
snd_i2c_device_free(device);
return err;
}
EXPORT_SYMBOL(snd_tea6330t_detect);
EXPORT_SYMBOL(snd_tea6330t_update_mixer);
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