Adding 4 more debugfs nodes, users could get more information about
the jack_kctl from them:
- kctl_id, read-only, get jack_kctl->kctl's id
sound/card0/HeadphoneJack# cat kctl_id
Headphone Jack
- mask_bits, read-only, get jack_kctl's events mask_bits
sound/card0/HeadphoneJack# cat mask_bits
0x0001 HEADPHONE(0x0001)
- status, read-only, get jack_kctl's current status
headphone unplugged:
sound/card0/HeadphoneJack# cat status
0x0000
headphone plugged:
sound/card0/HeadphoneJack# cat status
0x0001 HEADPHONE(0x0001)
- type, read-only, get jack's supported events type
sound/card0/HeadphoneJack# cat type
0x0001 HEADPHONE(0x0001)
Signed-off-by: Hui Wang <hui.wang@xxxxxxxxxxxxx>
---
sound/core/jack.c | 144 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 144 insertions(+)
diff --git a/sound/core/jack.c b/sound/core/jack.c
index e1d1b26f3a5e..fc49dae887f8 100644
--- a/sound/core/jack.c
+++ b/sound/core/jack.c
@@ -230,6 +230,119 @@ static ssize_t jackin_inject_write(struct file *file,
return ret;
}
+static ssize_t jack_kctl_id_read(struct file *file,
+ char __user *to, size_t count, loff_t *ppos)
+{
+ struct snd_jack_kctl *jack_kctl = file->private_data;
+ char *buf;
+ int len, ret;
+
+ buf = kvzalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ len = scnprintf(buf, PAGE_SIZE, "%s\n", jack_kctl->kctl->id.name);
+ ret = simple_read_from_buffer(to, count, ppos, buf, len);
+
+ kvfree(buf);
+ return ret;
+}
+
+/* the bit definition is aligned with snd_jack_types in jack.h */
+static const char * const jack_events_name[] = {
+ "HEADPHONE(0x0001)", "MICROPHONE(0x0002)", "LINEOUT(0x0004)",
+ "MECHANICAL(0x0008)", "VIDEOOUT(0x0010)", "LINEIN(0x0020)",
+ "", "", "", "BTN_5(0x0200)", "BTN_4(0x0400)", "BTN_3(0x0800)",
+ "BTN_2(0x1000)", "BTN_1(0x2000)", "BTN_0(0x4000)", "",
+};
+
+static int parse_mask_bits(unsigned int mask_bits, char *s)
+{
+ char *buf;
+ int len, i;
+
+ buf = kvzalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ len = scnprintf(buf, PAGE_SIZE, "0x%04x", mask_bits);
+
+ for (i = 0; i < 16; i++)
+ if (mask_bits & (1 << i))
+ len += scnprintf(buf + strlen(buf), PAGE_SIZE - strlen(buf),
+ " %s", jack_events_name[i]);
+
+ len += scnprintf(buf + strlen(buf), PAGE_SIZE - strlen(buf), "\n");
+
+ strcpy(s, buf);
+
+ kvfree(buf);
+
+ return len;
+}
+
+static ssize_t jack_kctl_mask_bits_read(struct file *file,
+ char __user *to, size_t count, loff_t *ppos)
+{
+ struct snd_jack_kctl *jack_kctl = file->private_data;
+ char *buf;
+ int len, ret;
+
+ buf = kvzalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ len = parse_mask_bits(jack_kctl->mask_bits, buf);
+ ret = simple_read_from_buffer(to, count, ppos, buf, len);
+
+ kvfree(buf);
+ return ret;
+}
+
+static ssize_t jack_kctl_status_read(struct file *file,
+ char __user *to, size_t count, loff_t *ppos)
+{
+ struct snd_jack_kctl *jack_kctl = file->private_data;
+ char *buf;
+ int len, ret;
+
+ buf = kvzalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ len = parse_mask_bits(jack_kctl->kctl->private_value, buf);
+ ret = simple_read_from_buffer(to, count, ppos, buf, len);
+
+ kvfree(buf);
+ return ret;
+}
+
+#ifdef CONFIG_SND_JACK_INPUT_DEV
+static ssize_t jack_type_read(struct file *file,
+ char __user *to, size_t count, loff_t *ppos)
+{
+ struct snd_jack_kctl *jack_kctl = file->private_data;
+ char *buf;
+ int len, ret;
+
+ buf = kvzalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ len = parse_mask_bits(jack_kctl->jack->type, buf);
+ ret = simple_read_from_buffer(to, count, ppos, buf, len);
+
+ kvfree(buf);
+ return ret;
+}
+
+static const struct file_operations jack_type_fops = {
+ .open = simple_open,
+ .read = jack_type_read,
+ .llseek = default_llseek,
+};
+#endif
+
static const struct file_operations sw_inject_enable_fops = {
.open = simple_open,
.read = sw_inject_enable_read,
@@ -243,6 +356,24 @@ static const struct file_operations jackin_inject_fops = {
.llseek = default_llseek,
};
+static const struct file_operations jack_kctl_id_fops = {
+ .open = simple_open,
+ .read = jack_kctl_id_read,
+ .llseek = default_llseek,
+};
+
+static const struct file_operations jack_kctl_mask_bits_fops = {
+ .open = simple_open,
+ .read = jack_kctl_mask_bits_read,
+ .llseek = default_llseek,
+};
+
+static const struct file_operations jack_kctl_status_fops = {
+ .open = simple_open,
+ .read = jack_kctl_status_read,
+ .llseek = default_llseek,
+};
+
/* The substrings in the jack's name but not suitable for folder's name */
static const char * const dropped_chars[] = {
"/", "=", ",", " ",
@@ -282,6 +413,19 @@ static int snd_jack_debugfs_add_inject_node(struct snd_jack *jack,
debugfs_create_file("jackin_inject", 0200, jack_kctl->jack_debugfs_root, jack_kctl,
&jackin_inject_fops);
+ debugfs_create_file("kctl_id", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
+ &jack_kctl_id_fops);
+
+ debugfs_create_file("mask_bits", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
+ &jack_kctl_mask_bits_fops);
+
+ debugfs_create_file("status", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
+ &jack_kctl_status_fops);
+
+#ifdef CONFIG_SND_JACK_INPUT_DEV
+ debugfs_create_file("type", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
+ &jack_type_fops);
+#endif
return 0;
}
#else /* CONFIG_DEBUG_FS */
--
2.25.1
