On 1/22/21 11:13 PM, Takashi Iwai wrote:
On Fri, 22 Jan 2021 15:14:56 +0100,
Hui Wang wrote:
--- /dev/null
+++ b/Documentation/sound/designs/jack-injection.rst
<snip>
+ sound/card1/Headphone_Jack# echo 1 > jackin_inject
+ to inject plugout:
+ sound/card1/Headphone_Jack# echo 0 > jackin_inject
The lists could be better in a normal format, while only the examples
with cat and echo should be in verbose format.
Will fix it in v7.
diff --git a/sound/core/Kconfig b/sound/core/Kconfig
index d4554f376160..a9189f58dc56 100644
--- a/sound/core/Kconfig
+++ b/sound/core/Kconfig
@@ -38,6 +38,15 @@ config SND_JACK_INPUT_DEV
depends on SND_JACK
default y if INPUT=y || INPUT=SND
+config SND_JACK_INJECTION_DEBUG
+ bool "Sound jack injection interface via debugfs"
+ depends on SND_JACK && DEBUG_FS
Also, could depend on SND_DEBUG for consistency.
OK, will add this dependence.
diff --git a/sound/core/init.c b/sound/core/init.c
index 75aec71c48a8..e7f7cfe1143b 100644
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -13,6 +13,7 @@
#include <linux/time.h>
#include <linux/ctype.h>
#include <linux/pm.h>
+#include <linux/debugfs.h>
#include <linux/completion.h>
#include <sound/core.h>
@@ -161,6 +162,7 @@ int snd_card_new(struct device *parent, int idx, const char *xid,
{
struct snd_card *card;
int err;
+ char name[8];
if (snd_BUG_ON(!card_ret))
return -EINVAL;
@@ -244,6 +246,10 @@ int snd_card_new(struct device *parent, int idx, const char *xid,
dev_err(parent, "unable to create card info\n");
goto __error_ctl;
}
+
+ sprintf(name, "card%d", idx);
+ card->debugfs_root = debugfs_create_dir(name, sound_debugfs_root);
It's still an open question whether we want to create the debugfs
always. But I guess it's OK, we might want to add more stuff to
debugfs later. Or, it makes sense to create only if
CONFIG_SND_DEBUG=y.
Will add "#ifdef CONFIG_SND_DEBUG" to conditionally create
debugfs_mount_dir/sound and debugfs_mount_dir/sound/cardN
+static ssize_t sw_inject_enable_write(struct file *file,
+ const char __user *from, size_t count, loff_t *ppos)
+{
+ struct snd_jack_kctl *jack_kctl = file->private_data;
+ int ret, err;
+ unsigned long enable;
+ char buf[8] = { 0 };
+
+ if (count >= 8)
+ return -EINVAL;
+
+ ret = simple_write_to_buffer(buf, count, ppos, from, count);
The simple_write_to_buffer() doesn't terminate the string by itself,
hence you need to make sure the string termination before kstrtoul()
call. e.g. buf[sizeof(buf)-1] = 0;
And maybe it's easier to make a helper function to that, since it's
called in multiple places.
OK, I will change it as below:
char buf[8] = { 0 };
ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, from, count);
+static int parse_mask_bits(unsigned int mask_bits, char *s)
+{
+ char buf[256];
+ int len, i;
+
+ len = scnprintf(buf, sizeof(buf), "0x%04x", mask_bits);
+
+ for (i = 0; i < 16; i++)
+ if (mask_bits & (1 << i))
+ len += scnprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
+ " %s", jack_events_name[i]);
+
+ len += scnprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "\n");
+
+ strcpy(s, buf);
You need to intermediate buffer if you do a full copy here...
Just perform the string ops on s with a certain limit.
Also, you can use strncat() or strlcat() for simplicity.
I will drop intermediate buffer and don't use strcpy() here, and use
strlcat to replace scnprintf(), the changes like below:
/* the recommended the buffer size is 256 */
static int parse_mask_bits(unsigned int mask_bits, char *buf, size_t
buf_size)
{
int i;
scnprintf(buf, buf_size, "0x%04x", mask_bits);
for (i = 0; i < 16; i++)
if (mask_bits & (1 << i)) {
strlcat(buf, " ", buf_size);
strlcat(buf, jack_events_name[i], buf_size);
}
strlcat(buf, "\n", buf_size);
return strlen(buf);
}
Thanks,
Hui.
thanks,
Takashi
