thinkpad-acpi: fix ALSA callback return status

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

1 files changed, 29 insertions, 10 deletions

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 5d02cc06d1a7..e7b0c3bcef89 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -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_alsa_set_mute(const bool mute)
+{
+        dbg_printk(TPACPI_DBG_MIXER, "ALSA: trying to %smute\n",
+                   (mute) ? "" : "un");
+        return __volume_set_mute_ec(mute);
+}
+
 static int volume_set_mute(const bool mute)
 {
+        int rc;
+
         dbg_printk(TPACPI_DBG_MIXER, "trying to %smute\n",
                    (mute) ? "" : "un");
-        return volume_set_mute_ec(mute);
+
+        rc = __volume_set_mute_ec(mute);
+        return (rc < 0) ? rc : 0;
 }
 
-static int volume_set_volume_ec(const u8 vol)
+/* 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 = {