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authorEldad Zack <eldad@fogrefinery.com>2013-04-03 23:18:54 +0200
committerTakashi Iwai <tiwai@suse.de>2013-04-04 08:30:59 +0200
commit06ffc1ebddbed88662a47646ff6aa6a2b41f0aec (patch)
tree7090ac76f3cb113cc077090375162ab9765a35a5 /sound/usb
parentf6a8bc70f85fdc49c5a3eca687c6018ffee8f050 (diff)
ALSA: usb-audio: UAC2: do clock validity check earlier
Move the check that parse_audio_format_rates_v2() do after receiving the clock source entity ID directly into the find function and add a validation flag to the function. This patch does not introduce any logic flow change. It is provided to allow introducing automatic clock switching easier later. By moving this uac_clock_source_is_valid callsite, 2 additional callsites can be avoided. Signed-off-by: Eldad Zack <eldad@fogrefinery.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
-rw-r--r--sound/usb/clock.c34
-rw-r--r--sound/usb/clock.h3
-rw-r--r--sound/usb/format.c2
3 files changed, 21 insertions, 18 deletions
diff --git a/sound/usb/clock.c b/sound/usb/clock.c
index 013b346f045..0c98f52a1c9 100644
--- a/sound/usb/clock.c
+++ b/sound/usb/clock.c
@@ -131,7 +131,8 @@ static bool uac_clock_source_is_valid(struct snd_usb_audio *chip, int source_id)
}
static int __uac_clock_find_source(struct snd_usb_audio *chip,
- int entity_id, unsigned long *visited)
+ int entity_id, unsigned long *visited,
+ bool validate)
{
struct uac_clock_source_descriptor *source;
struct uac_clock_selector_descriptor *selector;
@@ -148,8 +149,15 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip,
/* first, see if the ID we're looking for is a clock source already */
source = snd_usb_find_clock_source(chip->ctrl_intf, entity_id);
- if (source)
- return source->bClockID;
+ if (source) {
+ entity_id = source->bClockID;
+ if (validate && !uac_clock_source_is_valid(chip, entity_id)) {
+ snd_printk(KERN_ERR "usb-audio:%d: clock source %d is not valid, cannot use\n",
+ chip->dev->devnum, entity_id);
+ return -ENXIO;
+ }
+ return entity_id;
+ }
selector = snd_usb_find_clock_selector(chip->ctrl_intf, entity_id);
if (selector) {
@@ -164,7 +172,7 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip,
/* Selector values are one-based */
if (ret > selector->bNrInPins || ret < 1) {
- printk(KERN_ERR
+ snd_printk(KERN_ERR
"%s(): selector reported illegal value, id %d, ret %d\n",
__func__, selector->bClockID, ret);
@@ -172,14 +180,14 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip,
}
return __uac_clock_find_source(chip, selector->baCSourceID[ret-1],
- visited);
+ visited, validate);
}
/* FIXME: multipliers only act as pass-thru element for now */
multiplier = snd_usb_find_clock_multiplier(chip->ctrl_intf, entity_id);
if (multiplier)
return __uac_clock_find_source(chip, multiplier->bCSourceID,
- visited);
+ visited, validate);
return -EINVAL;
}
@@ -195,11 +203,12 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip,
*
* Returns the clock source UnitID (>=0) on success, or an error.
*/
-int snd_usb_clock_find_source(struct snd_usb_audio *chip, int entity_id)
+int snd_usb_clock_find_source(struct snd_usb_audio *chip, int entity_id,
+ bool validate)
{
DECLARE_BITMAP(visited, 256);
memset(visited, 0, sizeof(visited));
- return __uac_clock_find_source(chip, entity_id, visited);
+ return __uac_clock_find_source(chip, entity_id, visited, validate);
}
static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
@@ -275,18 +284,11 @@ static int set_sample_rate_v2(struct snd_usb_audio *chip, int iface,
struct usb_device *dev = chip->dev;
__le32 data;
int err, cur_rate, prev_rate;
- int clock = snd_usb_clock_find_source(chip, fmt->clock);
+ int clock = snd_usb_clock_find_source(chip, fmt->clock, true);
if (clock < 0)
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;
- }
-
prev_rate = get_sample_rate_v2(chip, iface, fmt->altsetting, clock);
data = cpu_to_le32(rate);
diff --git a/sound/usb/clock.h b/sound/usb/clock.h
index 46630936d31..d592e4a2985 100644
--- a/sound/usb/clock.h
+++ b/sound/usb/clock.h
@@ -5,6 +5,7 @@ int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
struct usb_host_interface *alts,
struct audioformat *fmt, int rate);
-int snd_usb_clock_find_source(struct snd_usb_audio *chip, int entity_id);
+int snd_usb_clock_find_source(struct snd_usb_audio *chip, int entity_id,
+ bool validate);
#endif /* __USBAUDIO_CLOCK_H */
diff --git a/sound/usb/format.c b/sound/usb/format.c
index a695cafc059..20c77517095 100644
--- a/sound/usb/format.c
+++ b/sound/usb/format.c
@@ -280,7 +280,7 @@ static int parse_audio_format_rates_v2(struct snd_usb_audio *chip,
struct usb_device *dev = chip->dev;
unsigned char tmp[2], *data;
int nr_triplets, data_size, ret = 0;
- int clock = snd_usb_clock_find_source(chip, fp->clock);
+ int clock = snd_usb_clock_find_source(chip, fp->clock, false);
if (clock < 0) {
snd_printk(KERN_ERR "%s(): unable to find clock source (clock %d)\n",