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Diffstat (limited to 'sound/usb/clock.c')
-rw-r--r--sound/usb/clock.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/sound/usb/clock.c b/sound/usb/clock.c
index a676ad093d..60fcb872a8 100644
--- a/sound/usb/clock.c
+++ b/sound/usb/clock.c
@@ -261,6 +261,8 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip,
int ret, i, cur, err, pins, clock_id;
const u8 *sources;
int proto = fmt->protocol;
+ bool readable, writeable;
+ u32 bmControls;
entity_id &= 0xff;
@@ -292,11 +294,27 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip,
sources = GET_VAL(selector, proto, baCSourceID);
cur = 0;
+ if (proto == UAC_VERSION_3)
+ bmControls = le32_to_cpu(*(__le32 *)(&selector->v3.baCSourceID[0] + pins));
+ else
+ bmControls = *(__u8 *)(&selector->v2.baCSourceID[0] + pins);
+
+ readable = uac_v2v3_control_is_readable(bmControls,
+ UAC2_CX_CLOCK_SELECTOR);
+ writeable = uac_v2v3_control_is_writeable(bmControls,
+ UAC2_CX_CLOCK_SELECTOR);
+
if (pins == 1) {
ret = 1;
goto find_source;
}
+ /* for now just warn about buggy device */
+ if (!readable)
+ usb_audio_warn(chip,
+ "%s(): clock selector control is not readable, id %d\n",
+ __func__, clock_id);
+
/* the entity ID we are looking at is a selector.
* find out what it currently selects */
ret = uac_clock_selector_get_val(chip, clock_id);
@@ -325,7 +343,8 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip,
visited, validate);
if (ret > 0) {
/* Skip setting clock selector again for some devices */
- if (chip->quirk_flags & QUIRK_FLAG_SKIP_CLOCK_SELECTOR)
+ if (chip->quirk_flags & QUIRK_FLAG_SKIP_CLOCK_SELECTOR ||
+ !writeable)
return ret;
err = uac_clock_selector_set_val(chip, entity_id, cur);
if (err < 0) {
@@ -344,6 +363,9 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip,
return ret;
find_others:
+ if (!writeable)
+ return -ENXIO;
+
/* The current clock source is invalid, try others. */
for (i = 1; i <= pins; i++) {
if (i == cur)