ALSA: drivers: Clean up with new procfs helpers

Simplify the proc fs creation code with new helper functions,
snd_card_ro_proc_new() and snd_card_rw_proc_new().
Just a code refactoring and no functional changes.
Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/drivers/aloop.c

@@ -1133,16 +1133,10 @@ static void print_cable_info(struct snd_info_entry *entry,
 static int loopback_proc_new(struct loopback *loopback, int cidx)
 {
 	char name[32];
-	struct snd_info_entry *entry;
-	int err;
 
 	snprintf(name, sizeof(name), "cable#%d", cidx);
-	err = snd_card_proc_new(loopback->card, name, &entry);
-	if (err < 0)
-		return err;
-
-	snd_info_set_text_ops(entry, loopback, print_cable_info);
-	return 0;
+	return snd_card_ro_proc_new(loopback->card, name, loopback,
+				    print_cable_info);
 }
 
 static int loopback_probe(struct platform_device *devptr)

sound/drivers/dummy.c

@@ -1037,14 +1037,8 @@ static void dummy_proc_write(struct snd_info_entry *entry,
 
 static void dummy_proc_init(struct snd_dummy *chip)
 {
-	struct snd_info_entry *entry;
-
-	if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
-		snd_info_set_text_ops(entry, chip, dummy_proc_read);
-		entry->c.text.write = dummy_proc_write;
-		entry->mode |= 0200;
-		entry->private_data = chip;
-	}
+	snd_card_rw_proc_new(chip->card, "dummy_pcm", chip,
+			     dummy_proc_read, dummy_proc_write);
 }
 #else
 #define dummy_proc_init(x)

sound/drivers/vx/vx_core.c

@@ -643,10 +643,7 @@ static void vx_proc_read(struct snd_info_entry *entry, struct snd_info_buffer *b
 
 static void vx_proc_init(struct vx_core *chip)
 {
-	struct snd_info_entry *entry;
-
-	if (! snd_card_proc_new(chip->card, "vx-status", &entry))
-		snd_info_set_text_ops(entry, chip, vx_proc_read);
+	snd_card_ro_proc_new(chip->card, "vx-status", chip, vx_proc_read);
 }