[ALSA] hda-codec - Add a generic bind-control helper

Added callbacks for a generic bind-control of mixer elements.
This can be used for creating a mixer element controlling multiple
widgets at the same time.  Two macros, HDA_BIND_VOL() and HDA_BIND_SW(),
are introduced for creating bind-volume and bind-switch, respectively.
It taks the mixer element name and struct hda_bind_ctls pointer, which
contains the real control callbacks in ops field and long array for
private_value of each bound widget.
All widgets have to be the same type (i.e. the same amp capability).

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 47 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_local.h b/sound/pci/hda/hda_local.h
index 12428a67eb2a..fafcffe6fc79 100644
--- a/sound/pci/hda/hda_local.h
+++ b/sound/pci/hda/hda_local.h
@@ -102,6 +102,53 @@ int snd_hda_mixer_bind_switch_get(struct snd_kcontrol *kcontrol,
 int snd_hda_mixer_bind_switch_put(struct snd_kcontrol *kcontrol,
                                   struct snd_ctl_elem_value *ucontrol);
 
+/* more generic bound controls */
+struct hda_ctl_ops {
+        snd_kcontrol_info_t *info;
+        snd_kcontrol_get_t *get;
+        snd_kcontrol_put_t *put;
+        snd_kcontrol_tlv_rw_t *tlv;
+};
+
+extern struct hda_ctl_ops snd_hda_bind_vol;     /* for bind-volume with TLV */
+extern struct hda_ctl_ops snd_hda_bind_sw;      /* for bind-switch */
+
+struct hda_bind_ctls {
+        struct hda_ctl_ops *ops;
+        long values[];
+};
+
+int snd_hda_mixer_bind_ctls_info(struct snd_kcontrol *kcontrol,
+                                 struct snd_ctl_elem_info *uinfo);
+int snd_hda_mixer_bind_ctls_get(struct snd_kcontrol *kcontrol,
+                                struct snd_ctl_elem_value *ucontrol);
+int snd_hda_mixer_bind_ctls_put(struct snd_kcontrol *kcontrol,
+                                struct snd_ctl_elem_value *ucontrol);
+int snd_hda_mixer_bind_tlv(struct snd_kcontrol *kcontrol, int op_flag,
+                           unsigned int size, unsigned int __user *tlv);
+
+#define HDA_BIND_VOL(xname, bindrec) \
+        { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
+          .name = xname, \
+          .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |\
+                          SNDRV_CTL_ELEM_ACCESS_TLV_READ |\
+                          SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,\
+          .info = snd_hda_mixer_bind_ctls_info,\
+          .get =  snd_hda_mixer_bind_ctls_get,\
+          .put = snd_hda_mixer_bind_ctls_put,\
+          .tlv = { .c = snd_hda_mixer_bind_tlv },\
+          .private_value = (long) (bindrec) }
+#define HDA_BIND_SW(xname, bindrec) \
+        { .iface = SNDRV_CTL_ELEM_IFACE_MIXER,\
+          .name = xname, \
+          .info = snd_hda_mixer_bind_ctls_info,\
+          .get =  snd_hda_mixer_bind_ctls_get,\
+          .put = snd_hda_mixer_bind_ctls_put,\
+          .private_value = (long) (bindrec) }
+
+/*
+ * SPDIF I/O
+ */
 int snd_hda_create_spdif_out_ctls(struct hda_codec *codec, hda_nid_t nid);
 int snd_hda_create_spdif_in_ctls(struct hda_codec *codec, hda_nid_t nid);