Bluetooth: Add debugfs support to btmrvl driver

/debug/btmrvl/config/
/debug/btmrvl/status/

See Documentation/btmrvl.txt for details.

This patch incorporates a lot of comments given by
Nicolas Pitre <nico@marvell.com>. Many thanks to Nicolas Pitre.

Signed-off-by: Rahul Tank <rahult@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

5 files changed, 487 insertions, 1 deletions

diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index 8c89bd4abbf6..5f04014b62a1 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -173,6 +173,7 @@ config BT_HCIVHCI
 config BT_MRVL
         tristate "Marvell Bluetooth driver support"
         select FW_LOADER
+        select DEBUG_FS
         help
           The core driver to support Marvell Bluetooth devices.
 
diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
index 2dc12e7d0155..75f70e0e3e53 100644
--- a/drivers/bluetooth/Makefile
+++ b/drivers/bluetooth/Makefile
@@ -15,7 +15,7 @@ obj-$(CONFIG_BT_HCIBTUART)	+= btuart_cs.o
 obj-$(CONFIG_BT_HCIBTUSB)       += btusb.o
 obj-$(CONFIG_BT_HCIBTSDIO)      += btsdio.o
 
-btmrvl-objs                     := btmrvl_main.o
+btmrvl-objs                     := btmrvl_main.o btmrvl_debugfs.o
 obj-$(CONFIG_BT_MRVL)           += btmrvl.o
 obj-$(CONFIG_BT_MRVL_SDIO)      += btmrvl_sdio.o
 
diff --git a/drivers/bluetooth/btmrvl_debugfs.c b/drivers/bluetooth/btmrvl_debugfs.c
new file mode 100644
index 000000000000..747bb0c723c3
--- /dev/null
+++ b/drivers/bluetooth/btmrvl_debugfs.c
@@ -0,0 +1,469 @@
+/**
+ * Marvell Bluetooth driver: debugfs related functions
+ *
+ * Copyright (C) 2009, Marvell International Ltd.
+ *
+ * This software file (the "File") is distributed by Marvell International
+ * Ltd. under the terms of the GNU General Public License Version 2, June 1991
+ * (the "License").  You may use, redistribute and/or modify this File in
+ * accordance with the terms and conditions of the License, a copy of which
+ * is available by writing to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
+ * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
+ *
+ *
+ * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
+ * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
+ * this warranty disclaimer.
+ **/
+
+#include <linux/debugfs.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+
+#include "btmrvl_drv.h"
+
+struct btmrvl_debugfs_data {
+        struct dentry *root_dir, *config_dir, *status_dir;
+
+        /* config */
+        struct dentry *drvdbg;
+        struct dentry *psmode;
+        struct dentry *pscmd;
+        struct dentry *hsmode;
+        struct dentry *hscmd;
+        struct dentry *gpiogap;
+        struct dentry *hscfgcmd;
+
+        /* status */
+        struct dentry *curpsmode;
+        struct dentry *hsstate;
+        struct dentry *psstate;
+        struct dentry *txdnldready;
+};
+
+static int btmrvl_open_generic(struct inode *inode, struct file *file)
+{
+        file->private_data = inode->i_private;
+        return 0;
+}
+
+static ssize_t btmrvl_hscfgcmd_write(struct file *file,
+                                        const char __user *ubuf,
+                                        size_t count,
+                                        loff_t *ppos)
+{
+        struct btmrvl_private *priv =
+                                (struct btmrvl_private *) file->private_data;
+
+        long result, ret;
+        char buf[16];
+
+        memset(buf, 0, sizeof(buf));
+
+        if (copy_from_user(&buf, ubuf,
+                                min_t(size_t, sizeof(buf) - 1, count)))
+                return -EFAULT;
+
+        ret = strict_strtol(buf, 10, &result);
+
+        priv->btmrvl_dev.hscfgcmd = result;
+
+        if (priv->btmrvl_dev.hscfgcmd) {
+                btmrvl_prepare_command(priv);
+                wake_up_interruptible(&priv->main_thread.wait_q);
+        }
+
+        return count;
+}
+
+static ssize_t btmrvl_hscfgcmd_read(struct file *file, char __user * userbuf,
+                                    size_t count, loff_t *ppos)
+{
+        struct btmrvl_private *priv =
+                                (struct btmrvl_private *) file->private_data;
+        int ret;
+        char buf[16];
+
+        ret = snprintf(buf, sizeof(buf) - 1, "%d\n",
+                        priv->btmrvl_dev.hscfgcmd);
+
+        return simple_read_from_buffer(userbuf, count, ppos, buf, ret);
+}
+
+static const struct file_operations btmrvl_hscfgcmd_fops = {
+        .read = btmrvl_hscfgcmd_read,
+        .write = btmrvl_hscfgcmd_write,
+        .open = btmrvl_open_generic,
+};
+
+static ssize_t btmrvl_psmode_write(struct file *file, const char __user *ubuf,
+                                   size_t count, loff_t *ppos)
+{
+        struct btmrvl_private *priv =
+                                (struct btmrvl_private *) file->private_data;
+        long result, ret;
+        char buf[16];
+
+        memset(buf, 0, sizeof(buf));
+
+        if (copy_from_user(&buf, ubuf,
+                                min_t(size_t, sizeof(buf) - 1, count)))
+                return -EFAULT;
+
+        ret = strict_strtol(buf, 10, &result);
+
+        priv->btmrvl_dev.psmode = result;
+
+        return count;
+}
+
+static ssize_t btmrvl_psmode_read(struct file *file, char __user * userbuf,
+                                  size_t count, loff_t *ppos)
+{
+        struct btmrvl_private *priv =
+                                (struct btmrvl_private *) file->private_data;
+        int ret;
+        char buf[16];
+
+        ret = snprintf(buf, sizeof(buf) - 1, "%d\n",
+                        priv->btmrvl_dev.psmode);
+
+        return simple_read_from_buffer(userbuf, count, ppos, buf, ret);
+}
+
+static const struct file_operations btmrvl_psmode_fops = {
+        .read = btmrvl_psmode_read,
+        .write = btmrvl_psmode_write,
+        .open = btmrvl_open_generic,
+};
+
+static ssize_t btmrvl_pscmd_write(struct file *file, const char __user *ubuf,
+                                  size_t count, loff_t *ppos)
+{
+        struct btmrvl_private *priv =
+                                (struct btmrvl_private *) file->private_data;
+        long result, ret;
+        char buf[16];
+
+        memset(buf, 0, sizeof(buf));
+
+        if (copy_from_user(&buf, ubuf,
+                                min_t(size_t, sizeof(buf) - 1, count)))
+                return -EFAULT;
+
+        ret = strict_strtol(buf, 10, &result);
+
+        priv->btmrvl_dev.pscmd = result;
+
+        if (priv->btmrvl_dev.pscmd) {