ARM: tegra: stingray: usbnet: sysfs attribute to identify BLAN

This is to help user spece modules to identify Motorola BLAN
networking device. Work around the issue of getting semi-random
interface number depending on the boot-up configuration.

Change-Id: Ib2b16699239a16da960c33ef98bbee84bde71dec
Signed-off-by: Kazuhiro Ondo <kazuhiro.ondo@motorola.com>

diff --git a/arch/arm/mach-tegra/board-stingray-usbnet.c b/arch/arm/mach-tegra/board-stingray-usbnet.c
index b2c2199a39149fa5ba2b92ebb1537db93edcc48d..cb0d1e03689fcc140a5d7d2642a41489fecda1a0 100644 (file)
--- a/arch/arm/mach-tegra/board-stingray-usbnet.c
+++ b/arch/arm/mach-tegra/board-stingray-usbnet.c
@@ -186,6 +186,17 @@ static struct usb_descriptor_header *hs_function[] = {
        if (context && context->gadget)                                 \
                dev_dbg(&(context->gadget->dev) , fmt , ## args)
 
+static const char *usb_description = "Motorola BLAN Interface";
+
+static ssize_t usbnet_desc_show(struct device *dev,
+                                struct device_attribute *attr, char *buff)
+{
+       ssize_t status = 0;
+       status = sprintf(buff, "%s\n", usb_description);
+       return status;
+}
+
+static DEVICE_ATTR(description, S_IRUGO, usbnet_desc_show, NULL);
 
 static inline struct usbnet_device *func_to_dev(struct usb_function *f)
 {
@@ -402,6 +413,7 @@ static void usbnet_cleanup(struct usbnet_device *dev)
 {
        struct usbnet_context *context = dev->net_ctxt;
        if (context) {
+               device_remove_file(&(context->dev->dev), &dev_attr_description);
                unregister_netdev(context->dev);
                free_netdev(context->dev);
                dev->net_ctxt = NULL;
@@ -752,7 +764,6 @@ static void usbnet_resume(struct usb_function *f)
        USBNETDBG(context, "%s\n", __func__);
 }
 
-
 int usbnet_bind_config(struct usb_configuration *c)
 {
        struct usbnet_device *dev;
@@ -779,6 +790,15 @@ int usbnet_bind_config(struct usb_configuration *c)
                free_netdev(net_dev);
                return -EINVAL;
        }
+
+       ret = device_create_file(&net_dev->dev, &dev_attr_description);
+       if (ret < 0) {
+               pr_err("%s: sys file creation  error\n", __func__);
+               unregister_netdev(net_dev);
+               free_netdev(net_dev);
+               return -EINVAL;
+       }
+
        context = netdev_priv(net_dev);
        INIT_WORK(&context->usbnet_config_wq, usbnet_if_config);
 
@@ -810,9 +830,9 @@ int usbnet_bind_config(struct usb_configuration *c)
        return 0;
 
 err1:
-       kfree(dev);
        pr_err("usbnet gadget driver failed to initialize\n");
        usbnet_cleanup(dev);
+       kfree(dev);
        return ret;
 }