Bluetooth: Convert inquiry cache to use debugfs instead of sysfs

The output of the inquiry cache is only useful for debugging purposes
and so move it into debugfs.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

2 files changed, 64 insertions, 30 deletions

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 7e65885290d5..4c94c1e233a2 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -134,6 +134,8 @@ struct hci_dev {
 
         atomic_t                promisc;
 
+        struct dentry           *debugfs;
+
         struct device           *parent;
         struct device           dev;
 
diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c
index 9b5f376813b7..f9d93f9cbcd2 100644
--- a/net/bluetooth/hci_sysfs.c
+++ b/net/bluetooth/hci_sysfs.c
@@ -2,6 +2,7 @@
 
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/debugfs.h>
 
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
@@ -9,6 +10,9 @@
 struct class *bt_class = NULL;
 EXPORT_SYMBOL_GPL(bt_class);
 
+struct dentry *bt_debugfs = NULL;
+EXPORT_SYMBOL_GPL(bt_debugfs);
+
 static struct workqueue_struct *bt_workq;
 
 static inline char *link_typetostr(int type)
@@ -251,32 +255,6 @@ static ssize_t show_hci_revision(struct device *dev, struct device_attribute *at
         return sprintf(buf, "%d\n", hdev->hci_rev);
 }
 
-static ssize_t show_inquiry_cache(struct device *dev, struct device_attribute *attr, char *buf)
-{
-        struct hci_dev *hdev = dev_get_drvdata(dev);
-        struct inquiry_cache *cache = &hdev->inq_cache;
-        struct inquiry_entry *e;
-        int n = 0;
-
-        hci_dev_lock_bh(hdev);
-
-        for (e = cache->list; e; e = e->next) {
-                struct inquiry_data *data = &e->data;
-                bdaddr_t bdaddr;
-                baswap(&bdaddr, &data->bdaddr);
-                n += sprintf(buf + n, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
-                                batostr(&bdaddr),
-                                data->pscan_rep_mode, data->pscan_period_mode,
-                                data->pscan_mode, data->dev_class[2],
-                                data->dev_class[1], data->dev_class[0],
-                                __le16_to_cpu(data->clock_offset),
-                                data->rssi, data->ssp_mode, e->timestamp);
-        }
-
-        hci_dev_unlock_bh(hdev);
-        return n;
-}
-
 static ssize_t show_idle_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 {
         struct hci_dev *hdev = dev_get_drvdata(dev);
@@ -363,7 +341,6 @@ static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
-static DEVICE_ATTR(inquiry_cache, S_IRUGO, show_inquiry_cache, NULL);
 
 static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
                                 show_idle_timeout, store_idle_timeout);
@@ -381,7 +358,6 @@ static struct attribute *bt_host_attrs[] = {
         &dev_attr_manufacturer.attr,
         &dev_attr_hci_version.attr,
         &dev_attr_hci_revision.attr,
-        &dev_attr_inquiry_cache.attr,
         &dev_attr_idle_timeout.attr,
         &dev_attr_sniff_max_interval.attr,
         &dev_attr_sniff_min_interval.attr,
@@ -409,6 +385,46 @@ static struct device_type bt_host = {
         .release = bt_host_release,
 };
 
+static int inquiry_cache_open(struct inode *inode, struct file *file)
+{
+        file->private_data = inode->i_private;
+        return 0;
+}
+
+static ssize_t inquiry_cache_read(struct file *file, char __user *userbuf,
+                                                size_t count, loff_t *ppos)
+{
+        struct hci_dev *hdev = file->private_data;
+        struct inquiry_cache *cache = &hdev->inq_cache;
+        struct inquiry_entry *e;
+        char buf[4096];
+        int n = 0;
+
+        hci_dev_lock_bh(hdev);
+
+        for (e = cache->list; e; e = e->next) {
+                struct inquiry_data *data = &e->data;
+                bdaddr_t bdaddr;
+                baswap(&bdaddr, &data->bdaddr);
+                n += sprintf(buf + n, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
+                                batostr(&bdaddr),
+                                data->pscan_rep_mode, data->pscan_period_mode,
+                                data->pscan_mode, data->dev_class[2],
+                                data->dev_class[1], data->dev_class[0],
+                                __le16_to_cpu(data->clock_offset),
+                                data->rssi, data->ssp_mode, e->timestamp);
+        }
+
+        hci_dev_unlock_bh(hdev);
+
+        return simple_read_from_buffer(userbuf, count, ppos, buf, n);
+}
+
+static const struct file_operations inquiry_cache_fops = {
+        .open = inquiry_cache_open,
+        .read = inquiry_cache_read,
+};
+
 int hci_register_sysfs(struct hci_dev *hdev)
 {
         struct device *dev = &hdev->dev;
@@ -428,6 +444,16 @@ int hci_register_sysfs(struct hci_dev *hdev)
         if (err < 0)
                 return err;
 
+        if (!bt_debugfs)
+                return 0;
+
+        hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs);
+        if (!hdev->debugfs)
+                return 0;
+
+        debugfs_create_file("inquiry_cache", 0444, hdev->debugfs,
+                                                hdev, &inquiry_cache_fops);
+
         return 0;
 }
 
@@ -435,6 +461,8 @@ void hci_unregister_sysfs(struct hci_dev *hdev)
 {
         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 
+        debugfs_remove_recursive(hdev->debugfs);
+
         device_del(&hdev->dev);
 }
 
@@ -444,6 +472,8 @@ int __init bt_sysfs_init(void)
         if (!bt_workq)
                 return -ENOMEM;
 
+        bt_debugfs = debugfs_create_dir("bluetooth", NULL);
+
         bt_class = class_create(THIS_MODULE, "bluetooth");
         if (IS_ERR(bt_class)) {
                 destroy_workqueue(bt_workq);
@@ -455,7 +485,9 @@ int __init bt_sysfs_init(void)
 
 void bt_sysfs_cleanup(void)
 {
-        destroy_workqueue(bt_workq);
-
         class_destroy(bt_class);
+
+        debugfs_remove_recursive(bt_debugfs);
+
+        destroy_workqueue(bt_workq);
 }