[ALSA] usb-audio - add a proc file for Audigy 2 NX jack status

USB generic driver
This patch adds a proc file for the SB Audigy 2 NX which shows the
connection status of the various jacks.  Unfortunately, no SPDIF input
frequency (yet).

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

1 files changed, 51 insertions, 3 deletions

diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index 4a49e1930a1a..83ba665e5c6e 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -36,6 +36,7 @@
 #include <sound/core.h>
 #include <sound/control.h>
 #include <sound/hwdep.h>
+#include <sound/info.h>
 
 #include "usbaudio.h"
 
@@ -1622,11 +1623,22 @@ static void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer,
 static void snd_usb_mixer_memory_change(struct usb_mixer_interface *mixer,
                                         int unitid)
 {
-        /* SB remote control */
-        if (mixer->rc_type != RC_NONE && unitid == 0) {
-                /* read control code from device memory */
+        if (mixer->rc_type == RC_NONE)
+                return;
+        /* unit ids specific to Extigy/Audigy 2 NX: */
+        switch (unitid) {
+        case 0: /* remote control */
                 mixer->rc_urb->dev = mixer->chip->dev;
                 usb_submit_urb(mixer->rc_urb, GFP_ATOMIC);
+                break;
+        case 4: /* digital in jack */
+        case 7: /* line in jacks */
+        case 19: /* speaker out jacks */
+        case 20: /* headphones out jack */
+                break;
+        default:
+                snd_printd(KERN_DEBUG "memory change in unknown unit %d\n", unitid);
+                break;
         }
 }
 
@@ -1894,6 +1906,37 @@ static int snd_audigy2nx_controls_create(struct usb_mixer_interface *mixer)
         return 0;
 }
 
+static void snd_audigy2nx_proc_read(snd_info_entry_t *entry,
+                                    snd_info_buffer_t *buffer)
+{
+        static const struct {
+                int unitid;
+                const char *name;
+        } jacks[] = {
+                {4,  "dig in "},
+                {7,  "line in"},
+                {19, "spk out"},
+                {20, "hph out"},
+        };
+        struct usb_mixer_interface *mixer = entry->private_data;
+        int i, err;
+        u8 buf[3];
+
+        snd_iprintf(buffer, "%s jacks\n\n", mixer->chip->card->shortname);
+        for (i = 0; i < ARRAY_SIZE(jacks); ++i) {
+                snd_iprintf(buffer, "%s: ", jacks[i].name);
+                err = snd_usb_ctl_msg(mixer->chip->dev,
+                                      usb_rcvctrlpipe(mixer->chip->dev, 0),
+                                      GET_MEM, USB_DIR_IN | USB_TYPE_CLASS |
+                                      USB_RECIP_INTERFACE, 0,
+                                      jacks[i].unitid << 8, buf, 3, 100);
+                if (err == 3 && buf[0] == 3)
+                        snd_iprintf(buffer, "%02x %02x\n", buf[1], buf[2]);
+                else
+                        snd_iprintf(buffer, "?\n");
+        }
+}
+
 int snd_usb_create_mixer(snd_usb_audio_t *chip, int ctrlif)
 {
         static snd_device_ops_t dev_ops = {
@@ -1926,8 +1969,13 @@ int snd_usb_create_mixer(snd_usb_audio_t *chip, int ctrlif)
                 goto _error;
 
         if (mixer->chip->usb_id == USB_ID(0x041e, 0x3020)) {
+                snd_info_entry_t *entry;
+
                 if ((err = snd_audigy2nx_controls_create(mixer)) < 0)
                         goto _error;
+                if (!snd_card_proc_new(chip->card, "audigy2nx", &entry))
+                        snd_info_set_text_ops(entry, mixer, 1024,
+                                              snd_audigy2nx_proc_read);
         }
 
         err = snd_device_new(chip->card, SNDRV_DEV_LOWLEVEL, mixer, &dev_ops);