ALSA: usb-audio: move and add some comments
Also add a list of open topics.
Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/usb/clock.c b/sound/usb/clock.c
index 386b09c..7279d61 100644
--- a/sound/usb/clock.c
+++ b/sound/usb/clock.c
@@ -120,8 +120,6 @@
return !!data;
}
-/* Try to find the clock source ID of a given clock entity */
-
static int __uac_clock_find_source(struct snd_usb_audio *chip,
struct usb_host_interface *host_iface,
int entity_id, unsigned long *visited)
@@ -154,6 +152,8 @@
if (ret < 0)
return ret;
+ /* Selector values are one-based */
+
if (ret > selector->bNrInPins || ret < 1) {
printk(KERN_ERR
"%s(): selector reported illegal value, id %d, ret %d\n",
@@ -176,6 +176,17 @@
return -EINVAL;
}
+/*
+ * For all kinds of sample rate settings and other device queries,
+ * the clock source (end-leaf) must be used. However, clock selectors,
+ * clock multipliers and sample rate converters may be specified as
+ * clock source input to terminal. This functions walks the clock path
+ * to its end and tries to find the source.
+ *
+ * The 'visited' bitfield is used internally to detect recursive loops.
+ *
+ * Returns the clock source UnitID (>=0) on success, or an error.
+ */
int snd_usb_clock_find_source(struct snd_usb_audio *chip,
struct usb_host_interface *host_iface,
int entity_id)
@@ -246,6 +257,7 @@
return clock;
if (!uac_clock_source_is_valid(chip, clock)) {
+ /* TODO: should we try to find valid clock setups by ourself? */
snd_printk(KERN_ERR "%d:%d:%d: clock source %d is not valid, cannot use\n",
dev->devnum, iface, fmt->altsetting, clock);
return -ENXIO;
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index ba54eb6..1163ec3 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -26,6 +26,22 @@
*
*/
+/*
+ * TODOs, for both the mixer and the streaming interfaces:
+ *
+ * - support for UAC2 effect units
+ * - support for graphical equalizers
+ * - RANGE and MEM set commands (UAC2)
+ * - RANGE and MEM interrupt dispatchers (UAC2)
+ * - audio channel clustering (UAC2)
+ * - audio sample rate converter units (UAC2)
+ * - proper handling of clock multipliers (UAC2)
+ * - dispatch clock change notifications (UAC2)
+ * - stop PCM streams which use a clock that became invalid
+ * - stop PCM streams which use a clock selector that has changed
+ * - parse available sample rates again when clock sources changed
+ */
+
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/list.h>
@@ -1199,14 +1215,6 @@
}
} else { /* UAC_VERSION_2 */
for (i = 0; i < 30/2; i++) {
- /* From the USB Audio spec v2.0:
- bmaControls() is a (ch+1)-element array of 4-byte bitmaps,
- each containing a set of bit pairs. If a Control is present,
- it must be Host readable. If a certain Control is not
- present then the bit pair must be set to 0b00.
- If a Control is present but read-only, the bit pair must be
- set to 0b01. If a Control is also Host programmable, the bit
- pair must be set to 0b11. The value 0b10 is not allowed. */
unsigned int ch_bits = 0;
unsigned int ch_read_only = 0;
