2 files changed, 9 insertions, 4 deletions

diff --git a/include/sound/control.h b/include/sound/control.h
index 5358892b1b39..042613938a1d 100644
--- a/include/sound/control.h
+++ b/include/sound/control.h
@@ -31,10 +31,15 @@ typedef int (snd_kcontrol_info_t) (struct snd_kcontrol * kcontrol, struct snd_ct
 typedef int (snd_kcontrol_get_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol);
 typedef int (snd_kcontrol_put_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_value * ucontrol);
 typedef int (snd_kcontrol_tlv_rw_t)(struct snd_kcontrol *kcontrol,
-                                    int op_flag, /* 0=read,1=write,-1=command */
+                                    int op_flag, /* SNDRV_CTL_TLV_OP_XXX */
                                     unsigned int size,
                                     unsigned int __user *tlv);
 
+enum {
+        SNDRV_CTL_TLV_OP_READ = 0,
+        SNDRV_CTL_TLV_OP_WRITE = 1,
+        SNDRV_CTL_TLV_OP_CMD = -1,
+};
 
 struct snd_kcontrol_new {
         snd_ctl_elem_iface_t iface;     /* interface identifier */
diff --git a/sound/core/control.c b/sound/core/control.c
index f0b0e14497a5..b9611344ff9e 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -1406,11 +1406,11 @@ static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg
         case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
                 return snd_ctl_subscribe_events(ctl, ip);
         case SNDRV_CTL_IOCTL_TLV_READ:
-                return snd_ctl_tlv_ioctl(ctl, argp, 0);
+                return snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_READ);
         case SNDRV_CTL_IOCTL_TLV_WRITE:
-                return snd_ctl_tlv_ioctl(ctl, argp, 1);
+                return snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_WRITE);
         case SNDRV_CTL_IOCTL_TLV_COMMAND:
-                return snd_ctl_tlv_ioctl(ctl, argp, -1);
+                return snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_CMD);
         case SNDRV_CTL_IOCTL_POWER:
                 return -ENOPROTOOPT;
         case SNDRV_CTL_IOCTL_POWER_STATE: