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[ALSA] aoa: add locking to tas codec
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Looks like I completely forgot to do this. This patch adds locking to
the tas codec so two userspace programs can't hit the controls at the
same time. Tested on my powerbook, but I obviously can't find any
problems even without it since it doesn't do SMP.

Signed-off-by: Johannes Berg <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
Signed-off-by: Jaroslav Kysela <[email protected]>
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@jmberg
jmberg authored and Jaroslav Kysela committed Sep 23, 2006
1 parent 43001c9 commit 3071920
Showing 1 changed file with 83 additions and 13 deletions.
96 changes: 83 additions & 13 deletions sound/aoa/codecs/snd-aoa-codec-tas.c
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Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,8 @@
#include <asm/prom.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/mutex.h>

MODULE_AUTHOR("Johannes Berg <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("tas codec driver for snd-aoa");
Expand All @@ -91,6 +93,10 @@ struct tas {
u8 bass, treble;
u8 acr;
int drc_range;
/* protects hardware access against concurrency from
* userspace when hitting controls and during
* codec init/suspend/resume */
struct mutex mtx;
};

static int tas_reset_init(struct tas *tas);
Expand Down Expand Up @@ -231,8 +237,10 @@ static int tas_snd_vol_get(struct snd_kcontrol *kcontrol,
{
struct tas *tas = snd_kcontrol_chip(kcontrol);

mutex_lock(&tas->mtx);
ucontrol->value.integer.value[0] = tas->cached_volume_l;
ucontrol->value.integer.value[1] = tas->cached_volume_r;
mutex_unlock(&tas->mtx);
return 0;
}

Expand All @@ -241,14 +249,18 @@ static int tas_snd_vol_put(struct snd_kcontrol *kcontrol,
{
struct tas *tas = snd_kcontrol_chip(kcontrol);

mutex_lock(&tas->mtx);
if (tas->cached_volume_l == ucontrol->value.integer.value[0]
&& tas->cached_volume_r == ucontrol->value.integer.value[1])
&& tas->cached_volume_r == ucontrol->value.integer.value[1]) {
mutex_unlock(&tas->mtx);
return 0;
}

tas->cached_volume_l = ucontrol->value.integer.value[0];
tas->cached_volume_r = ucontrol->value.integer.value[1];
if (tas->hw_enabled)
tas_set_volume(tas);
mutex_unlock(&tas->mtx);
return 1;
}

Expand Down Expand Up @@ -276,8 +288,10 @@ static int tas_snd_mute_get(struct snd_kcontrol *kcontrol,
{
struct tas *tas = snd_kcontrol_chip(kcontrol);

mutex_lock(&tas->mtx);
ucontrol->value.integer.value[0] = !tas->mute_l;
ucontrol->value.integer.value[1] = !tas->mute_r;
mutex_unlock(&tas->mtx);
return 0;
}

Expand All @@ -286,14 +300,18 @@ static int tas_snd_mute_put(struct snd_kcontrol *kcontrol,
{
struct tas *tas = snd_kcontrol_chip(kcontrol);

mutex_lock(&tas->mtx);
if (tas->mute_l == !ucontrol->value.integer.value[0]
&& tas->mute_r == !ucontrol->value.integer.value[1])
&& tas->mute_r == !ucontrol->value.integer.value[1]) {
mutex_unlock(&tas->mtx);
return 0;
}

tas->mute_l = !ucontrol->value.integer.value[0];
tas->mute_r = !ucontrol->value.integer.value[1];
if (tas->hw_enabled)
tas_set_volume(tas);
mutex_unlock(&tas->mtx);
return 1;
}

Expand Down Expand Up @@ -322,8 +340,10 @@ static int tas_snd_mixer_get(struct snd_kcontrol *kcontrol,
struct tas *tas = snd_kcontrol_chip(kcontrol);
int idx = kcontrol->private_value;

mutex_lock(&tas->mtx);
ucontrol->value.integer.value[0] = tas->mixer_l[idx];
ucontrol->value.integer.value[1] = tas->mixer_r[idx];
mutex_unlock(&tas->mtx);

return 0;
}
Expand All @@ -334,15 +354,19 @@ static int tas_snd_mixer_put(struct snd_kcontrol *kcontrol,
struct tas *tas = snd_kcontrol_chip(kcontrol);
int idx = kcontrol->private_value;

mutex_lock(&tas->mtx);
if (tas->mixer_l[idx] == ucontrol->value.integer.value[0]
&& tas->mixer_r[idx] == ucontrol->value.integer.value[1])
&& tas->mixer_r[idx] == ucontrol->value.integer.value[1]) {
mutex_unlock(&tas->mtx);
return 0;
}

tas->mixer_l[idx] = ucontrol->value.integer.value[0];
tas->mixer_r[idx] = ucontrol->value.integer.value[1];

if (tas->hw_enabled)
tas_set_mixer(tas);
mutex_unlock(&tas->mtx);
return 1;
}

Expand Down Expand Up @@ -375,7 +399,9 @@ static int tas_snd_drc_range_get(struct snd_kcontrol *kcontrol,
{
struct tas *tas = snd_kcontrol_chip(kcontrol);

mutex_lock(&tas->mtx);
ucontrol->value.integer.value[0] = tas->drc_range;
mutex_unlock(&tas->mtx);
return 0;
}

Expand All @@ -384,12 +410,16 @@ static int tas_snd_drc_range_put(struct snd_kcontrol *kcontrol,
{
struct tas *tas = snd_kcontrol_chip(kcontrol);

if (tas->drc_range == ucontrol->value.integer.value[0])
mutex_lock(&tas->mtx);
if (tas->drc_range == ucontrol->value.integer.value[0]) {
mutex_unlock(&tas->mtx);
return 0;
}

tas->drc_range = ucontrol->value.integer.value[0];
if (tas->hw_enabled)
tas3004_set_drc(tas);
mutex_unlock(&tas->mtx);
return 1;
}

Expand Down Expand Up @@ -417,7 +447,9 @@ static int tas_snd_drc_switch_get(struct snd_kcontrol *kcontrol,
{
struct tas *tas = snd_kcontrol_chip(kcontrol);

mutex_lock(&tas->mtx);
ucontrol->value.integer.value[0] = tas->drc_enabled;
mutex_unlock(&tas->mtx);
return 0;
}

Expand All @@ -426,12 +458,16 @@ static int tas_snd_drc_switch_put(struct snd_kcontrol *kcontrol,
{
struct tas *tas = snd_kcontrol_chip(kcontrol);

if (tas->drc_enabled == ucontrol->value.integer.value[0])
mutex_lock(&tas->mtx);
if (tas->drc_enabled == ucontrol->value.integer.value[0]) {
mutex_unlock(&tas->mtx);
return 0;
}

tas->drc_enabled = ucontrol->value.integer.value[0];
if (tas->hw_enabled)
tas3004_set_drc(tas);
mutex_unlock(&tas->mtx);
return 1;
}

Expand Down Expand Up @@ -463,23 +499,31 @@ static int tas_snd_capture_source_get(struct snd_kcontrol *kcontrol,
{
struct tas *tas = snd_kcontrol_chip(kcontrol);

mutex_lock(&tas->mtx);
ucontrol->value.enumerated.item[0] = !!(tas->acr & TAS_ACR_INPUT_B);
mutex_unlock(&tas->mtx);
return 0;
}

static int tas_snd_capture_source_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct tas *tas = snd_kcontrol_chip(kcontrol);
int oldacr = tas->acr;
int oldacr;

mutex_lock(&tas->mtx);
oldacr = tas->acr;

tas->acr &= ~TAS_ACR_INPUT_B;
if (ucontrol->value.enumerated.item[0])
tas->acr |= TAS_ACR_INPUT_B;
if (oldacr == tas->acr)
if (oldacr == tas->acr) {
mutex_unlock(&tas->mtx);
return 0;
}
if (tas->hw_enabled)
tas_write_reg(tas, TAS_REG_ACR, 1, &tas->acr);
mutex_unlock(&tas->mtx);
return 1;
}

Expand Down Expand Up @@ -518,7 +562,9 @@ static int tas_snd_treble_get(struct snd_kcontrol *kcontrol,
{
struct tas *tas = snd_kcontrol_chip(kcontrol);

mutex_lock(&tas->mtx);
ucontrol->value.integer.value[0] = tas->treble;
mutex_unlock(&tas->mtx);
return 0;
}

Expand All @@ -527,12 +573,16 @@ static int tas_snd_treble_put(struct snd_kcontrol *kcontrol,
{
struct tas *tas = snd_kcontrol_chip(kcontrol);

if (tas->treble == ucontrol->value.integer.value[0])
mutex_lock(&tas->mtx);
if (tas->treble == ucontrol->value.integer.value[0]) {
mutex_unlock(&tas->mtx);
return 0;
}

tas->treble = ucontrol->value.integer.value[0];
if (tas->hw_enabled)
tas_set_treble(tas);
mutex_unlock(&tas->mtx);
return 1;
}

Expand Down Expand Up @@ -560,7 +610,9 @@ static int tas_snd_bass_get(struct snd_kcontrol *kcontrol,
{
struct tas *tas = snd_kcontrol_chip(kcontrol);

mutex_lock(&tas->mtx);
ucontrol->value.integer.value[0] = tas->bass;
mutex_unlock(&tas->mtx);
return 0;
}

Expand All @@ -569,12 +621,16 @@ static int tas_snd_bass_put(struct snd_kcontrol *kcontrol,
{
struct tas *tas = snd_kcontrol_chip(kcontrol);

if (tas->bass == ucontrol->value.integer.value[0])
mutex_lock(&tas->mtx);
if (tas->bass == ucontrol->value.integer.value[0]) {
mutex_unlock(&tas->mtx);
return 0;
}

tas->bass = ucontrol->value.integer.value[0];
if (tas->hw_enabled)
tas_set_bass(tas);
mutex_unlock(&tas->mtx);
return 1;
}

Expand Down Expand Up @@ -628,16 +684,16 @@ static int tas_reset_init(struct tas *tas)

tmp = TAS_MCS_SCLK64 | TAS_MCS_SPORT_MODE_I2S | TAS_MCS_SPORT_WL_24BIT;
if (tas_write_reg(tas, TAS_REG_MCS, 1, &tmp))
return -ENODEV;
goto outerr;

tas->acr |= TAS_ACR_ANALOG_PDOWN | TAS_ACR_B_MONAUREAL |
TAS_ACR_B_MON_SEL_RIGHT;
if (tas_write_reg(tas, TAS_REG_ACR, 1, &tas->acr))
return -ENODEV;
goto outerr;

tmp = 0;
if (tas_write_reg(tas, TAS_REG_MCS2, 1, &tmp))
return -ENODEV;
goto outerr;

tas3004_set_drc(tas);

Expand All @@ -649,9 +705,11 @@ static int tas_reset_init(struct tas *tas)

tas->acr &= ~TAS_ACR_ANALOG_PDOWN;
if (tas_write_reg(tas, TAS_REG_ACR, 1, &tas->acr))
return -ENODEV;
goto outerr;

return 0;
outerr:
return -ENODEV;
}

static int tas_switch_clock(struct codec_info_item *cii, enum clock_switch clock)
Expand All @@ -666,11 +724,13 @@ static int tas_switch_clock(struct codec_info_item *cii, enum clock_switch clock
break;
case CLOCK_SWITCH_SLAVE:
/* Clocks are back, re-init the codec */
mutex_lock(&tas->mtx);
tas_reset_init(tas);
tas_set_volume(tas);
tas_set_mixer(tas);
tas->hw_enabled = 1;
tas->codec.gpio->methods->all_amps_restore(tas->codec.gpio);
mutex_unlock(&tas->mtx);
break;
default:
/* doesn't happen as of now */
Expand All @@ -684,19 +744,23 @@ static int tas_switch_clock(struct codec_info_item *cii, enum clock_switch clock
* our i2c device is suspended, and then take note of that! */
static int tas_suspend(struct tas *tas)
{
mutex_lock(&tas->mtx);
tas->hw_enabled = 0;
tas->acr |= TAS_ACR_ANALOG_PDOWN;
tas_write_reg(tas, TAS_REG_ACR, 1, &tas->acr);
mutex_unlock(&tas->mtx);
return 0;
}

static int tas_resume(struct tas *tas)
{
/* reset codec */
mutex_lock(&tas->mtx);
tas_reset_init(tas);
tas_set_volume(tas);
tas_set_mixer(tas);
tas->hw_enabled = 1;
mutex_unlock(&tas->mtx);
return 0;
}

Expand Down Expand Up @@ -739,11 +803,14 @@ static int tas_init_codec(struct aoa_codec *codec)
return -EINVAL;
}

mutex_lock(&tas->mtx);
if (tas_reset_init(tas)) {
printk(KERN_ERR PFX "tas failed to initialise\n");
mutex_unlock(&tas->mtx);
return -ENXIO;
}
tas->hw_enabled = 1;
mutex_unlock(&tas->mtx);

if (tas->codec.soundbus_dev->attach_codec(tas->codec.soundbus_dev,
aoa_get_card(),
Expand Down Expand Up @@ -822,6 +889,7 @@ static int tas_create(struct i2c_adapter *adapter,
if (!tas)
return -ENOMEM;

mutex_init(&tas->mtx);
tas->i2c.driver = &tas_driver;
tas->i2c.adapter = adapter;
tas->i2c.addr = addr;
Expand Down Expand Up @@ -850,6 +918,7 @@ static int tas_create(struct i2c_adapter *adapter,
detach:
i2c_detach_client(&tas->i2c);
fail:
mutex_destroy(&tas->mtx);
kfree(tas);
return -EINVAL;
}
Expand Down Expand Up @@ -908,6 +977,7 @@ static int tas_i2c_detach(struct i2c_client *client)
/* power down codec chip */
tas_write_reg(tas, TAS_REG_ACR, 1, &tmp);

mutex_destroy(&tas->mtx);
kfree(tas);
return 0;
}
Expand Down

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