From: Zhaoyang Liu <liuzy@xxxxxxxxxxx>
This patch adds support for debug mask read/write operations
via debugfs. It is useful during debugging driver logs.
Examples:
Read current debug mask:
cat /sys/kernel/debug/bluetooth/hci0/config/debug_mask
Update debug mask:
echo 0xff > /sys/kernel/debug/bluetooth/hci0/config/debug_mask
Signed-off-by: Zhaoyang Liu <liuzy@xxxxxxxxxxx>
Signed-off-by: Cathy Luo <cluo@xxxxxxxxxxx>
Signed-off-by: Amitkumar Karwar <akarwar@xxxxxxxxxxx>
---
drivers/bluetooth/btmrvl_debugfs.c | 51 ++++++++++++++++++++++++++++++++++++++
1 file changed, 51 insertions(+)
diff --git a/drivers/bluetooth/btmrvl_debugfs.c b/drivers/bluetooth/btmrvl_debugfs.c
index 1828ed8..af52b03 100644
--- a/drivers/bluetooth/btmrvl_debugfs.c
+++ b/drivers/bluetooth/btmrvl_debugfs.c
@@ -196,6 +196,55 @@ static const struct file_operations btmrvl_fwdump_fops = {
.llseek = default_llseek,
};
+/* Proc debug_mask file read handler.
+ * This function is called when the 'debug_mask' file is opened for reading
+ * This function can be used read driver debugging mask value.
+ */
+static ssize_t btmrvl_debug_mask_read(struct file *file, char __user *ubuf,
+ size_t count, loff_t *ppos)
+{
+ struct btmrvl_private *priv = file->private_data;
+ char buf[32];
+ int ret;
+
+ ret = snprintf(buf, sizeof(buf) - 1, "debug mask=0x%08x\n",
+ priv->adapter->debug_mask);
+
+ return simple_read_from_buffer(ubuf, count, ppos, buf, ret);
+}
+
+/* Proc debug_mask file read handler.
+ * This function is called when the 'debug_mask' file is opened for reading
+ * This function can be used read driver debugging mask value.
+ */
+static ssize_t btmrvl_debug_mask_write(struct file *file,
+ const char __user *ubuf,
+ size_t count, loff_t *ppos)
+{
+ struct btmrvl_private *priv = file->private_data;
+ char buf[32];
+ unsigned long dbg_mask;
+
+ memset(buf, 0, sizeof(buf));
+
+ if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
+ return -EFAULT;
+
+ if (kstrtol(buf, 0, &dbg_mask))
+ return -EINVAL;
+
+ priv->adapter->debug_mask = dbg_mask;
+
+ return count;
+}
+
+static const struct file_operations btmrvl_debug_mask_fops = {
+ .read = btmrvl_debug_mask_read,
+ .write = btmrvl_debug_mask_write,
+ .open = simple_open,
+ .llseek = default_llseek,
+};
+
void btmrvl_debugfs_init(struct hci_dev *hdev)
{
struct btmrvl_private *priv = hci_get_drvdata(hdev);
@@ -228,6 +277,8 @@ void btmrvl_debugfs_init(struct hci_dev *hdev)
priv, &btmrvl_hscfgcmd_fops);
debugfs_create_file("fw_dump", 0200, dbg->config_dir,
priv, &btmrvl_fwdump_fops);
+ debugfs_create_file("debug_mask", 0644, dbg->config_dir,
+ priv, &btmrvl_debug_mask_fops);
dbg->status_dir = debugfs_create_dir("status", hdev->debugfs);
debugfs_create_u8("curpsmode", 0444, dbg->status_dir,
--
1.8.1.4
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