[ALSA] Control API - more robust TLV implementation

- added callback option
- added READ/WRITE/COMMAND flags to access member
- added WRITE/COMMAND ioctls
- added SNDRV_CTL_EVENT_MASK_TLV for TLV change notifications
- added TLV support to ELEM_ADD ioctl

Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 14 insertions, 2 deletions

diff --git a/include/sound/control.h b/include/sound/control.h
index a93a58d0e688..e3905c5a0950 100644
--- a/include/sound/control.h
+++ b/include/sound/control.h
@@ -30,6 +30,11 @@ struct snd_kcontrol;
 typedef int (snd_kcontrol_info_t) (struct snd_kcontrol * kcontrol, struct snd_ctl_elem_info * uinfo);
 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 */
+                                    unsigned int size,
+                                    unsigned int __user *tlv);
+
 
 struct snd_kcontrol_new {
         snd_ctl_elem_iface_t iface;     /* interface identifier */
@@ -42,7 +47,10 @@ struct snd_kcontrol_new {
         snd_kcontrol_info_t *info;
         snd_kcontrol_get_t *get;
         snd_kcontrol_put_t *put;
-        unsigned int *tlv;
+        union {
+                snd_kcontrol_tlv_rw_t *c;
+                unsigned int *p;
+        } tlv;
         unsigned long private_value;
 };
 
@@ -59,7 +67,11 @@ struct snd_kcontrol {
         snd_kcontrol_info_t *info;
         snd_kcontrol_get_t *get;
         snd_kcontrol_put_t *put;
-        unsigned int *tlv;
+        snd_kcontrol_tlv_rw_t *tlv_rw;
+        union {
+                snd_kcontrol_tlv_rw_t *c;
+                unsigned int *p;
+        } tlv;
         unsigned long private_value;
         void *private_data;
         void (*private_free)(struct snd_kcontrol *kcontrol);