linux-kernel - [PATCH] ASoC: use DEFINE_SHOW_ATTRIBUTE() to decrease code duplication

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Message-ID: <CAErzpmuKgMyxascCdq3KuF1F1K4e2ciZq7FKsOha6WSBgg-WYw@mail.gmail.com>
Date:   Fri, 9 Feb 2018 14:58:18 +0800
From:   Donglin Peng <dolinux.peng@...il.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     ALSA Development Mailing List <alsa-devel@...a-project.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] ASoC: use DEFINE_SHOW_ATTRIBUTE() to decrease code duplication

There is some duplicate code in soc-core.c,and the kernel provides
DEFINE_SHOW_ATTRIBUTE() helper macro to decrease it in seq_file.h.

Signed-off-by: Peng Donglin <dolinux.peng@...il.com>
---
 sound/soc/soc-core.c | 51 +++++++++------------------------------------------
 1 file changed, 9 insertions(+), 42 deletions(-)

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 96c44f6576c9..cb52d1e8e0b9 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -349,33 +349,22 @@ static void soc_init_codec_debugfs(struct
snd_soc_component *component)
             "ASoC: Failed to create codec register debugfs file\n");
 }

-static int codec_list_seq_show(struct seq_file *m, void *v)
+static int codec_list_show(struct seq_file *s, void *v)
 {
     struct snd_soc_codec *codec;

     mutex_lock(&client_mutex);

     list_for_each_entry(codec, &codec_list, list)
-        seq_printf(m, "%s\n", codec->component.name);
+        seq_printf(s, "%s\n", codec->component.name);

     mutex_unlock(&client_mutex);

     return 0;
 }
+DEFINE_SHOW_ATTRIBUTE(codec_list);

-static int codec_list_seq_open(struct inode *inode, struct file *file)
-{
-    return single_open(file, codec_list_seq_show, NULL);
-}
-
-static const struct file_operations codec_list_fops = {
-    .open = codec_list_seq_open,
-    .read = seq_read,
-    .llseek = seq_lseek,
-    .release = single_release,
-};
-
-static int dai_list_seq_show(struct seq_file *m, void *v)
+static int dai_list_show(struct seq_file *s, void *v)
 {
     struct snd_soc_component *component;
     struct snd_soc_dai *dai;
@@ -384,50 +373,28 @@ static int dai_list_seq_show(struct seq_file *m, void *v)

     list_for_each_entry(component, &component_list, list)
         list_for_each_entry(dai, &component->dai_list, list)
-            seq_printf(m, "%s\n", dai->name);
+            seq_printf(s, "%s\n", dai->name);

     mutex_unlock(&client_mutex);

     return 0;
 }
+DEFINE_SHOW_ATTRIBUTE(dai_list);

-static int dai_list_seq_open(struct inode *inode, struct file *file)
-{
-    return single_open(file, dai_list_seq_show, NULL);
-}
-
-static const struct file_operations dai_list_fops = {
-    .open = dai_list_seq_open,
-    .read = seq_read,
-    .llseek = seq_lseek,
-    .release = single_release,
-};
-
-static int platform_list_seq_show(struct seq_file *m, void *v)
+static int platform_list_show(struct seq_file *s, void *v)
 {
     struct snd_soc_platform *platform;

     mutex_lock(&client_mutex);

     list_for_each_entry(platform, &platform_list, list)
-        seq_printf(m, "%s\n", platform->component.name);
+        seq_printf(s, "%s\n", platform->component.name);

     mutex_unlock(&client_mutex);

     return 0;
 }
-
-static int platform_list_seq_open(struct inode *inode, struct file *file)
-{
-    return single_open(file, platform_list_seq_show, NULL);
-}
-
-static const struct file_operations platform_list_fops = {
-    .open = platform_list_seq_open,
-    .read = seq_read,
-    .llseek = seq_lseek,
-    .release = single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(platform_list);

 static void soc_init_card_debugfs(struct snd_soc_card *card)
 {
-- 
2.16.1