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thinkpad-acpi: fix ALSA callback return status

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Clemens Ladisch reports that thinkpad-acpi improperly implements the
ALSA API, and always returns 0 for success for the "put" callbacks
while the API requires it to return "1" when the control value has
been changed in the hardware/firmware.

Rework the volume subdriver to be able to properly implement the ALSA
API.  Based on a patch by Clemens Ladisch <clemens@ladisch.de>.

This fix is also needed on 2.6.33.

Reported-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: stable@kernel.org
This commit is contained in:
Henrique de Moraes Holschuh 2010-02-27 18:45:29 -03:00
parent b525c06cdb
commit 88cc83772a
1 changed files with 31 additions and 12 deletions
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43
drivers/platform/x86/thinkpad_acpi.c
View file

@ -6541,7 +6541,8 @@ static int volume_set_status(const u8 status)
return volume_set_status_ec(status);
}
static int volume_set_mute_ec(const bool mute)
/* returns < 0 on error, 0 on no change, 1 on change */
static int __volume_set_mute_ec(const bool mute)
{
int rc;
u8 s, n;
@ -6556,22 +6557,37 @@ static int volume_set_mute_ec(const bool mute)
n = (mute) ? s | TP_EC_AUDIO_MUTESW_MSK :
s & ~TP_EC_AUDIO_MUTESW_MSK;
if (n != s)
if (n != s) {
rc = volume_set_status_ec(n);
if (!rc)
rc = 1;
}
unlock:
mutex_unlock(&volume_mutex);
return rc;
}
static int volume_set_mute(const bool mute)
static int volume_alsa_set_mute(const bool mute)
{
dbg_printk(TPACPI_DBG_MIXER, "trying to %smute\n",
dbg_printk(TPACPI_DBG_MIXER, "ALSA: trying to %smute\n",
(mute) ? "" : "un");
return volume_set_mute_ec(mute);
return __volume_set_mute_ec(mute);
}
static int volume_set_volume_ec(const u8 vol)
static int volume_set_mute(const bool mute)
{
int rc;
dbg_printk(TPACPI_DBG_MIXER, "trying to %smute\n",
(mute) ? "" : "un");
rc = __volume_set_mute_ec(mute);
return (rc < 0) ? rc : 0;
}
/* returns < 0 on error, 0 on no change, 1 on change */
static int __volume_set_volume_ec(const u8 vol)
{
int rc;
u8 s, n;
@ -6588,19 +6604,22 @@ static int volume_set_volume_ec(const u8 vol)
n = (s & ~TP_EC_AUDIO_LVL_MSK) | vol;
if (n != s)
if (n != s) {
rc = volume_set_status_ec(n);
if (!rc)
rc = 1;
}
unlock:
mutex_unlock(&volume_mutex);
return rc;
}
static int volume_set_volume(const u8 vol)
static int volume_alsa_set_volume(const u8 vol)
{
dbg_printk(TPACPI_DBG_MIXER,
"trying to set volume level to %hu\n", vol);
return volume_set_volume_ec(vol);
"ALSA: trying to set volume level to %hu\n", vol);
return __volume_set_volume_ec(vol);
}
static void volume_alsa_notify_change(void)
@ -6647,7 +6666,7 @@ static int volume_alsa_vol_get(struct snd_kcontrol *kcontrol,
static int volume_alsa_vol_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
return volume_set_volume(ucontrol->value.integer.value[0]);
return volume_alsa_set_volume(ucontrol->value.integer.value[0]);
}
#define volume_alsa_mute_info snd_ctl_boolean_mono_info
@ -6670,7 +6689,7 @@ static int volume_alsa_mute_get(struct snd_kcontrol *kcontrol,
static int volume_alsa_mute_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
return volume_set_mute(!ucontrol->value.integer.value[0]);
return volume_alsa_set_mute(!ucontrol->value.integer.value[0]);
}
static struct snd_kcontrol_new volume_alsa_control_vol __devinitdata = {