[PATCH v30 07/30] ALSA: Add USB audio device jack type

Wesley Cheng
2024-11-06T19:34:47Z

Add an USB jack type, in order to support notifying of a valid USB audio
device. Since USB audio devices can have a slew of different
configurations that reach beyond the basic headset and headphone use cases,
classify these devices differently.

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
---
include/linux/mod_devicetable.h | 2 +-
include/sound/jack.h | 4 +++-
include/uapi/linux/input-event-codes.h | 3 ++-
sound/core/jack.c | 6 ++++--
4 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 4338b1b4ac44..82826f5a3741 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -340,7 +340,7 @@ struct pcmcia_device_id {
#define INPUT_DEVICE_ID_LED_MAX 0x0f
#define INPUT_DEVICE_ID_SND_MAX 0x07
#define INPUT_DEVICE_ID_FF_MAX 0x7f
-#define INPUT_DEVICE_ID_SW_MAX 0x10
+#define INPUT_DEVICE_ID_SW_MAX 0x11
#define INPUT_DEVICE_ID_PROP_MAX 0x1f

#define INPUT_DEVICE_ID_MATCH_BUS 1
diff --git a/include/sound/jack.h b/include/sound/jack.h
index 1ed90e2109e9..bd3f62281c97 100644
--- a/include/sound/jack.h
+++ b/include/sound/jack.h
@@ -22,6 +22,7 @@ struct input_dev;
* @SND_JACK_VIDEOOUT: Video out
* @SND_JACK_AVOUT: AV (Audio Video) out
* @SND_JACK_LINEIN: Line in
+ * @SND_JACK_USB: USB audio device
* @SND_JACK_BTN_0: Button 0
* @SND_JACK_BTN_1: Button 1
* @SND_JACK_BTN_2: Button 2
@@ -43,6 +44,7 @@ enum snd_jack_types {
SND_JACK_VIDEOOUT = 0x0010,
SND_JACK_AVOUT = SND_JACK_LINEOUT | SND_JACK_VIDEOOUT,
SND_JACK_LINEIN = 0x0020,
+ SND_JACK_USB = 0x0040,

/* Kept separate from switches to facilitate implementation */
SND_JACK_BTN_0 = 0x4000,
@@ -54,7 +56,7 @@ enum snd_jack_types {
};

/* Keep in sync with definitions above */
-#define SND_JACK_SWITCH_TYPES 6
+#define SND_JACK_SWITCH_TYPES 7

struct snd_jack {
struct list_head kctl_list;
diff --git a/include/uapi/linux/input-event-codes.h b/include/uapi/linux/input-event-codes.h
index a4206723f503..f44b9f41d26f 100644
--- a/include/uapi/linux/input-event-codes.h
+++ b/include/uapi/linux/input-event-codes.h
@@ -924,7 +924,8 @@
#define SW_MUTE_DEVICE 0x0e /* set = device disabled */
#define SW_PEN_INSERTED 0x0f /* set = pen inserted */
#define SW_MACHINE_COVER 0x10 /* set = cover closed */
-#define SW_MAX 0x10
+#define SW_USB_INSERT 0x11 /* set = USB audio device connected */
+#define SW_MAX 0x11
#define SW_CNT (SW_MAX+1)

/*
diff --git a/sound/core/jack.c b/sound/core/jack.c
index e4bcecdf89b7..de7c603e92b7 100644
--- a/sound/core/jack.c
+++ b/sound/core/jack.c
@@ -34,6 +34,7 @@ static const int jack_switch_types[SND_JACK_SWITCH_TYPES] = {
SW_JACK_PHYSICAL_INSERT,
SW_VIDEOOUT_INSERT,
SW_LINEIN_INSERT,
+ SW_USB_INSERT,
};
#endif /* CONFIG_SND_JACK_INPUT_DEV */

@@ -241,8 +242,9 @@ static ssize_t jack_kctl_id_read(struct file *file,
static const char * const jack_events_name[] = {
"HEADPHONE(0x0001)", "MICROPHONE(0x0002)", "LINEOUT(0x0004)",
"MECHANICAL(0x0008)", "VIDEOOUT(0x0010)", "LINEIN(0x0020)",
- "", "", "", "BTN_5(0x0200)", "BTN_4(0x0400)", "BTN_3(0x0800)",
- "BTN_2(0x1000)", "BTN_1(0x2000)", "BTN_0(0x4000)", "",
+ "USB(0x0040)", "", "", "BTN_5(0x0200)", "BTN_4(0x0400)",
+ "BTN_3(0x0800)", "BTN_2(0x1000)", "BTN_1(0x2000)", "BTN_0(0x4000)",
+ "",
};

/* the recommended buffer size is 256 */