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>
diff --git a/include/sound/core.h b/include/sound/core.h
index a61499c..89e0ac1 100644
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -458,5 +458,8 @@
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 */
diff --git a/sound/core/misc.c b/sound/core/misc.c
index 23a032c..3da4f92 100644
--- a/sound/core/misc.c
+++ b/sound/core/misc.c
@@ -101,6 +101,35 @@
#ifdef CONFIG_PCI
#include <linux/pci.h>
/**
+ * 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
+ * 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_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 != vendor)
+ continue;
+ if (!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
@@ -114,16 +143,9 @@
const struct snd_pci_quirk *
snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list)
{
- const struct snd_pci_quirk *q;
-
- for (q = list; q->subvendor; q++) {
- if (q->subvendor != pci->subsystem_vendor)
- continue;
- if (!q->subdevice ||
- (pci->subsystem_device & q->subdevice_mask) == q->subdevice)
- return q;
- }
- return NULL;
+ return snd_pci_quirk_lookup_id(pci->subsystem_vendor,
+ pci->subsystem_device,
+ list);
}
EXPORT_SYMBOL(snd_pci_quirk_lookup);
#endif
