[alsa-devel] Tests of the hda-jack branch

[Clemens Ladisch]

David Henningsson wrote:
> ... two patches - one adds a "device index" for mapping against pcm
> devices on HDMI,

> +	kctl->id.device = device;

In the general case, there is not always a 1:1 mapping between jacks and
PCM devices, so I fear that a jack belonging to device 0 cannot be
distinguished from a jack that has no specific device.

There is a convention that id.device is a valid PCM device number if and
only if id.iface is IFACE_PCM.  However, it might be useful to map
controls with IFACE_MIXER to PCM devices, so I'd propose a new TLV, like
in the incomplete patch below.


Regards,
Clemens


--- a/include/sound/tlv.h
+++ b/include/sound/tlv.h
@@ -37,6 +37,7 @@
 #define SNDRV_CTL_TLVT_DB_RANGE 3	/* dB range container */
 #define SNDRV_CTL_TLVT_DB_MINMAX 4	/* dB scale with min/max */
 #define SNDRV_CTL_TLVT_DB_MINMAX_MUTE 5	/* dB scale with min/max with mute */
+#define SNDRV_CTL_TLVT_PCM_DEVICE 6	/* jack (or other control?) maps to this device */

 #define _TLV_ITEM(type, ...) \
 	(type), _TLV_LENGTH(__VA_ARGS__), __VA_ARGS__
@@ -81,4 +82,9 @@

 #define TLV_DB_GAIN_MUTE	-9999999

+#define TLB_PCM_DEVICE_NUMBER_ITEM(devno) \
+	SNDRV_CTL_TLVT_PCM_DEVICE, 1 * sizeof(unsigned int), (devno)
+#define DECLARE_TLV_PCM_DEVICE_NUMBER(name, devno) \
+	unsigned int name[] = { TLV_PCM_DEVICE_NUMBER_ITEM(devno) }
+
 #endif /* __SOUND_TLV_H */
--- a/sound/pci/hda/hda_jack.c
+++ b/sound/pci/hda/hda_jack.c
@@ -15,6 +15,7 @@
 #include <sound/core.h>
 #include <sound/control.h>
 #include <sound/jack.h>
+#include <sound/tlv.h>
 #include "hda_codec.h"
 #include "hda_local.h"
 #include "hda_jack.h"
@@ -210,7 +211,7 @@ EXPORT_SYMBOL_HDA(snd_hda_jack_report_sync);
  * will have the given name and index.
  */
 int snd_hda_jack_add_kctl(struct hda_codec *codec, hda_nid_t nid,
-			  const char *name, int idx)
+			  const char *name, int idx, int device)
 {
 	struct hda_jack_tbl *jack;
 	struct snd_kcontrol *kctl;
@@ -223,6 +224,11 @@ int snd_hda_jack_add_kctl(struct hda_codec *codec, hda_nid_t nid,
 	kctl = snd_kctl_jack_new(name, idx, codec);
 	if (!kctl)
 		return -ENOMEM;
+	jack->tlv[0] = SNDRV_CTL_TLVT_PCM_DEVICE;
+	jack->tlv[1] = 1 * sizeof(unsigned int);
+	jack->tlv[2] = device;
+	kctl->tlv.p = jack->tlv;
+	kctl->access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
 	if (snd_hda_ctl_add(codec, nid, kctl) < 0)
 		return -ENOMEM;
 	jack->kctl = kctl;
@@ -249,7 +255,7 @@ static int add_jack_kctl(struct hda_codec *codec, hda_nid_t nid,
 		return 0;

 	snd_hda_get_pin_label(codec, nid, cfg, name, sizeof(name), &idx);
-	err = snd_hda_jack_add_kctl(codec, nid, name, idx);
+	err = snd_hda_jack_add_kctl(codec, nid, name, idx, 0);
 	if (err < 0)
 		return err;
 	return snd_hda_jack_detect_enable(codec, nid, 0);
--- a/sound/pci/hda/hda_jack.h
+++ b/sound/pci/hda/hda_jack.h
@@ -22,6 +22,7 @@ struct hda_jack_tbl {
 	unsigned int jack_detect:1;	/* capable of jack-detection? */
 	unsigned int jack_dirty:1;	/* needs to update? */
 	struct snd_kcontrol *kctl;	/* assigned kctl for jack-detection */
+	unsigned int tlv[3];
 #ifdef CONFIG_SND_HDA_INPUT_JACK
 	int type;
 	struct snd_jack *jack;
@@ -76,7 +77,7 @@ static inline bool is_jack_detectable(struct hda_codec *codec, hda_nid_t nid)
 }

 int snd_hda_jack_add_kctl(struct hda_codec *codec, hda_nid_t nid,
-			  const char *name, int idx);
+			  const char *name, int idx, int device);
 int snd_hda_jack_add_kctls(struct hda_codec *codec,
 			   const struct auto_pin_cfg *cfg);