ALSA: ASoC: Convert DAPM pop time configuration to debugfs

Pop time configuration is a debugging feature which shouldn't be used in
normal operation so move it to debugfs where it is clearer. This also
simplifies the code since debugfs provides standard facilities for
exposing simple integer values to user space.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

sound/soc/soc-dapm.c

@@ -38,6 +38,7 @@
 #include <linux/bitops.h>
 #include <linux/platform_device.h>
 #include <linux/jiffies.h>
+#include <linux/debugfs.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
@@ -67,7 +68,9 @@ static int dapm_status = 1;
 module_param(dapm_status, int, 0);
 MODULE_PARM_DESC(dapm_status, "enable DPM sysfs entries");
 
-static unsigned int pop_time;
+static struct dentry *asoc_debugfs;
+
+static u32 pop_time;
 
 static void pop_wait(void)
 {
@@ -817,51 +820,35 @@ static ssize_t dapm_widget_show(struct device *dev,
 
 static DEVICE_ATTR(dapm_widget, 0444, dapm_widget_show, NULL);
 
-/* pop/click delay times */
-static ssize_t dapm_pop_time_show(struct device *dev,
-	struct device_attribute *attr, char *buf)
-{
-	return sprintf(buf, "%d\n", pop_time);
-}
-
-static ssize_t dapm_pop_time_store(struct device *dev,
-				   struct device_attribute *attr,
-				   const char *buf, size_t count)
-
-{
-	unsigned long val;
-
-	if (strict_strtoul(buf, 10, &val) >= 0)
-		pop_time = val;
-	else
-		printk(KERN_ERR "Unable to parse pop_time setting\n");
-
-	return count;
-}
-
-static DEVICE_ATTR(dapm_pop_time, 0744, dapm_pop_time_show,
-		   dapm_pop_time_store);
-
 int snd_soc_dapm_sys_add(struct device *dev)
 {
 	int ret = 0;
 
-	if (dapm_status) {
+	if (!dapm_status)
+		return 0;
+
 	ret = device_create_file(dev, &dev_attr_dapm_widget);
+	if (ret != 0)
+		return ret;
 
-		if (ret == 0)
-			ret = device_create_file(dev, &dev_attr_dapm_pop_time);
-	}
+	asoc_debugfs = debugfs_create_dir("asoc", NULL);
+	if (!IS_ERR(asoc_debugfs))
+		debugfs_create_u32("dapm_pop_time", 0744, asoc_debugfs,
+				   &pop_time);
+	else
+		asoc_debugfs = NULL;
 
-	return ret;
+	return 0;
 }
 
 static void snd_soc_dapm_sys_remove(struct device *dev)
 {
 	if (dapm_status) {
-		device_remove_file(dev, &dev_attr_dapm_pop_time);
 		device_remove_file(dev, &dev_attr_dapm_widget);
 	}
+
+	if (asoc_debugfs)
+		debugfs_remove_recursive(asoc_debugfs);
 }
 
 /* free all dapm widgets and resources */