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authorAndrew Gabbasov <andrew_gabbasov@mentor.com>2019-11-20 20:49:55 +0300
committerTakashi Iwai <tiwai@suse.de>2019-11-20 21:38:30 +0300
commitc6ae99605633cade7dc61a2b35b04dda90302dad (patch)
tree5d479dbe2e3e9af61cccbdbb4eb7ffc1f073d842 /sound/drivers
parent26c53379f98d22d6a3e50bb146651dc7824334d7 (diff)
downloadlinux-c6ae99605633cade7dc61a2b35b04dda90302dad.tar.xz
ALSA: aloop: Support runtime change of snd_timer via info interface
Show and change sound card timer source with read-write info file in proc filesystem. Initial string can still be set as module parameter. The timer source string value can be changed at any time, but it is latched by PCM substream open callback (the first one for a particular cable). At this point it is actually used, that is the string is parsed, and the timer is looked up and opened. The timer source is set for a loopback card (the same as initial setting by module parameter), but every cable uses the value, current at the moment of open. Setting the value to empty string switches the timer to jiffies. Signed-off-by: Andrew Gabbasov <andrew_gabbasov@mentor.com> Link: https://lore.kernel.org/r/20191120174955.6410-8-andrew_gabbasov@mentor.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/drivers')
-rw-r--r--sound/drivers/aloop.c37
1 files changed, 34 insertions, 3 deletions
diff --git a/sound/drivers/aloop.c b/sound/drivers/aloop.c
index e8a85f887222..1408403f727a 100644
--- a/sound/drivers/aloop.c
+++ b/sound/drivers/aloop.c
@@ -1666,7 +1666,7 @@ static void print_cable_info(struct snd_info_entry *entry,
mutex_unlock(&loopback->cable_lock);
}
-static int loopback_proc_new(struct loopback *loopback, int cidx)
+static int loopback_cable_proc_new(struct loopback *loopback, int cidx)
{
char name[32];
@@ -1687,6 +1687,36 @@ static void loopback_set_timer_source(struct loopback *loopback,
value, GFP_KERNEL);
}
+static void print_timer_source_info(struct snd_info_entry *entry,
+ struct snd_info_buffer *buffer)
+{
+ struct loopback *loopback = entry->private_data;
+
+ mutex_lock(&loopback->cable_lock);
+ snd_iprintf(buffer, "%s\n",
+ loopback->timer_source ? loopback->timer_source : "");
+ mutex_unlock(&loopback->cable_lock);
+}
+
+static void change_timer_source_info(struct snd_info_entry *entry,
+ struct snd_info_buffer *buffer)
+{
+ struct loopback *loopback = entry->private_data;
+ char line[64];
+
+ mutex_lock(&loopback->cable_lock);
+ if (!snd_info_get_line(buffer, line, sizeof(line)))
+ loopback_set_timer_source(loopback, strim(line));
+ mutex_unlock(&loopback->cable_lock);
+}
+
+static int loopback_timer_source_proc_new(struct loopback *loopback)
+{
+ return snd_card_rw_proc_new(loopback->card, "timer_source", loopback,
+ print_timer_source_info,
+ change_timer_source_info);
+}
+
static int loopback_probe(struct platform_device *devptr)
{
struct snd_card *card;
@@ -1719,8 +1749,9 @@ static int loopback_probe(struct platform_device *devptr)
err = loopback_mixer_new(loopback, pcm_notify[dev] ? 1 : 0);
if (err < 0)
goto __nodev;
- loopback_proc_new(loopback, 0);
- loopback_proc_new(loopback, 1);
+ loopback_cable_proc_new(loopback, 0);
+ loopback_cable_proc_new(loopback, 1);
+ loopback_timer_source_proc_new(loopback);
strcpy(card->driver, "Loopback");
strcpy(card->shortname, "Loopback");
sprintf(card->longname, "Loopback %i", dev + 1);