ALSA: Add snd_pci_quirk_lookup_id()

Added a new function to look up a quirk entry with the given PCI SSID
instead of a pci device pointer.  This can be used when the searched ID
is overridden for debugging or such a purpose.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/core.h

@@ -458,5 +458,8 @@ struct snd_pci_quirk {
 const struct snd_pci_quirk *
 snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list);
 
+const struct snd_pci_quirk *
+snd_pci_quirk_lookup_id(u16 vendor, u16 device,
+			const struct snd_pci_quirk *list);
 
 #endif /* __SOUND_CORE_H */

sound/core/misc.c

@@ -101,8 +101,9 @@ EXPORT_SYMBOL_GPL(__snd_printk);
 #ifdef CONFIG_PCI
 #include <linux/pci.h>
 /**
- * snd_pci_quirk_lookup - look up a PCI SSID quirk list
- * @pci: pci_dev handle
+ * snd_pci_quirk_lookup_id - look up a PCI SSID quirk list
+ * @vendor: PCI SSV id
+ * @device: PCI SSD id
  * @list: quirk list, terminated by a null entry
  *
  * Look through the given quirk list and finds a matching entry
@@ -112,18 +113,39 @@ EXPORT_SYMBOL_GPL(__snd_printk);
  * Returns the matched entry pointer, or NULL if nothing matched.
  */
 const struct snd_pci_quirk *
-snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list)
+snd_pci_quirk_lookup_id(u16 vendor, u16 device,
+			const struct snd_pci_quirk *list)
 {
 	const struct snd_pci_quirk *q;
 
 	for (q = list; q->subvendor; q++) {
-		if (q->subvendor != pci->subsystem_vendor)
+		if (q->subvendor != vendor)
 			continue;
 		if (!q->subdevice ||
-		    (pci->subsystem_device & q->subdevice_mask) == q->subdevice)
+		    (device & q->subdevice_mask) == q->subdevice)
 			return q;
 	}
 	return NULL;
 }
+EXPORT_SYMBOL(snd_pci_quirk_lookup_id);
+
+/**
+ * snd_pci_quirk_lookup - look up a PCI SSID quirk list
+ * @pci: pci_dev handle
+ * @list: quirk list, terminated by a null entry
+ *
+ * Look through the given quirk list and finds a matching entry
+ * with the same PCI SSID.  When subdevice is 0, all subdevice
+ * values may match.
+ *
+ * Returns the matched entry pointer, or NULL if nothing matched.
+ */
+const struct snd_pci_quirk *
+snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list)
+{
+	return snd_pci_quirk_lookup_id(pci->subsystem_vendor,
+				       pci->subsystem_device,
+				       list);
+}
 EXPORT_SYMBOL(snd_pci_quirk_lookup);
 #endif