ALSA: control: Define SNDRV_CTL_TLV_OP_* constants

Instead of hard-coded magic numbers, define constants for op_flag to
tlv callbacks.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 6 insertions, 1 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 */