From d635711daa98be86d4c7fd01499c34f566b54ccb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Fabian=20Silva=20Delgado?=
 <emulatorman@parabola.nu>
Date: Fri, 10 Jun 2016 05:30:17 -0300
Subject: Linux-libre 4.6.2-gnu

---
 sound/usb/card.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 53 insertions(+), 3 deletions(-)

(limited to 'sound/usb/card.c')

diff --git a/sound/usb/card.c b/sound/usb/card.c
index 1f09d9591..3fc63583a 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -82,6 +82,7 @@ static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
 static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
 static bool ignore_ctl_error;
 static bool autoclock = true;
+static char *quirk_alias[SNDRV_CARDS];
 
 module_param_array(index, int, NULL, 0444);
 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
@@ -100,6 +101,8 @@ MODULE_PARM_DESC(ignore_ctl_error,
 		 "Ignore errors from USB controller for mixer interfaces.");
 module_param(autoclock, bool, 0444);
 MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
+module_param_array(quirk_alias, charp, NULL, 0444);
+MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef.");
 
 /*
  * we keep the snd_usb_audio_t instances by ourselves for merging
@@ -171,8 +174,9 @@ static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int int
 	if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
 	     altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
 	    altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
-		int err = snd_usbmidi_create(chip->card, iface,
-					     &chip->midi_list, NULL);
+		int err = __snd_usbmidi_create(chip->card, iface,
+					     &chip->midi_list, NULL,
+					     chip->usb_id);
 		if (err < 0) {
 			dev_err(&dev->dev,
 				"%u:%d: cannot create sequencer device\n",
@@ -311,6 +315,7 @@ static int snd_usb_audio_free(struct snd_usb_audio *chip)
 		snd_usb_endpoint_free(ep);
 
 	mutex_destroy(&chip->mutex);
+	dev_set_drvdata(&chip->dev->dev, NULL);
 	kfree(chip);
 	return 0;
 }
@@ -455,6 +460,48 @@ static int snd_usb_audio_create(struct usb_interface *intf,
 	return 0;
 }
 
+/* look for a matching quirk alias id */
+static bool get_alias_id(struct usb_device *dev, unsigned int *id)
+{
+	int i;
+	unsigned int src, dst;
+
+	for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) {
+		if (!quirk_alias[i] ||
+		    sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 ||
+		    src != *id)
+			continue;
+		dev_info(&dev->dev,
+			 "device (%04x:%04x): applying quirk alias %04x:%04x\n",
+			 USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id),
+			 USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst));
+		*id = dst;
+		return true;
+	}
+
+	return false;
+}
+
+static struct usb_device_id usb_audio_ids[]; /* defined below */
+
+/* look for the corresponding quirk */
+static const struct snd_usb_audio_quirk *
+get_alias_quirk(struct usb_device *dev, unsigned int id)
+{
+	const struct usb_device_id *p;
+
+	for (p = usb_audio_ids; p->match_flags; p++) {
+		/* FIXME: this checks only vendor:product pair in the list */
+		if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) ==
+		    USB_DEVICE_ID_MATCH_DEVICE &&
+		    p->idVendor == USB_ID_VENDOR(id) &&
+		    p->idProduct == USB_ID_PRODUCT(id))
+			return (const struct snd_usb_audio_quirk *)p->driver_info;
+	}
+
+	return NULL;
+}
+
 /*
  * probe the active usb device
  *
@@ -481,10 +528,12 @@ static int usb_audio_probe(struct usb_interface *intf,
 	ifnum = get_iface_desc(alts)->bInterfaceNumber;
 	id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 		    le16_to_cpu(dev->descriptor.idProduct));
+	if (get_alias_id(dev, &id))
+		quirk = get_alias_quirk(dev, id);
 	if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
 		return -ENXIO;
 
-	err = snd_usb_apply_boot_quirk(dev, intf, quirk);
+	err = snd_usb_apply_boot_quirk(dev, intf, quirk, id);
 	if (err < 0)
 		return err;
 
@@ -503,6 +552,7 @@ static int usb_audio_probe(struct usb_interface *intf,
 				goto __error;
 			}
 			chip = usb_chip[i];
+			dev_set_drvdata(&dev->dev, chip);
 			atomic_inc(&chip->active); /* avoid autopm */
 			break;
 		}
-- 
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