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From: Andrew Gabbasov <andrew_gabbasov@mentor.com>
To: <alsa-devel@alsa-project.org>, <linux-kernel@vger.kernel.org>,
	Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
	Timo Wischer <twischer@de.adit-jv.com>,
	Andrew Gabbasov <andrew_gabbasov@mentor.com>
Subject: [PATCH v4 7/7] ALSA: aloop: Support runtime change of snd_timer via info interface
Date: Wed, 20 Nov 2019 05:58:56 -0600	[thread overview]
Message-ID: <20191120115856.4125-8-andrew_gabbasov@mentor.com> (raw)
In-Reply-To: <20191120115856.4125-7-andrew_gabbasov@mentor.com>

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>
---
 sound/drivers/aloop.c | 37 ++++++++++++++++++++++++++++++++++---
 1 file changed, 34 insertions(+), 3 deletions(-)

diff --git a/sound/drivers/aloop.c b/sound/drivers/aloop.c
index 67ebbd510e1b..626a8b642b63 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);
-- 
2.21.0


  reply	other threads:[~2019-11-20 12:00 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-20 11:58 [PATCH v4 0/7] ALSA: aloop: Support sound timer as clock source instead of jiffies Andrew Gabbasov
2019-11-20 11:58 ` [PATCH v4 1/7] ALSA: aloop: Describe units of variables Andrew Gabbasov
2019-11-20 11:58   ` [PATCH v4 2/7] ALSA: aloop: Support return of error code for timer start and stop Andrew Gabbasov
2019-11-20 11:58     ` [PATCH v4 3/7] ALSA: aloop: Use callback functions for timer specific implementations Andrew Gabbasov
2019-11-20 11:58       ` [PATCH v4 4/7] ALSA: aloop: Rename all jiffies timer specific functions Andrew Gabbasov
2019-11-20 11:58         ` [PATCH v4 5/7] ALSA: aloop: Move CABLE_VALID_BOTH to the top of file Andrew Gabbasov
2019-11-20 11:58           ` [PATCH v4 6/7] ALSA: aloop: Support selection of snd_timer instead of jiffies Andrew Gabbasov
2019-11-20 11:58             ` Andrew Gabbasov [this message]
2019-11-20 14:33             ` Takashi Iwai
2019-11-20 15:21               ` Andrew Gabbasov
2019-11-20 15:32                 ` Takashi Iwai
2019-11-20 15:39                   ` Andrew Gabbasov
2019-11-20 15:58                     ` Takashi Iwai
2019-11-20 17:56                       ` Andrew Gabbasov

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