usb: gadget: introduce gadget state tracking

that's useful information to expose to userland.

Signed-off-by: Felipe Balbi <balbi@ti.com>

2 files changed, 32 insertions, 0 deletions

diff --git a/drivers/usb/gadget/udc-core.c b/drivers/usb/gadget/udc-core.c
index 40b1d888d5a1..8a1eeb24ae6a 100644
--- a/drivers/usb/gadget/udc-core.c
+++ b/drivers/usb/gadget/udc-core.c
@@ -101,6 +101,16 @@ EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);
 
 /* ------------------------------------------------------------------------- */
 
+void usb_gadget_set_state(struct usb_gadget *gadget,
+                enum usb_device_state state)
+{
+        gadget->state = state;
+        sysfs_notify(&gadget->dev.kobj, NULL, "status");
+}
+EXPORT_SYMBOL_GPL(usb_gadget_set_state);
+
+/* ------------------------------------------------------------------------- */
+
 /**
  * usb_gadget_udc_start - tells usb device controller to start up
  * @gadget: The gadget we want to get started
@@ -197,6 +207,8 @@ int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
         if (ret)
                 goto err4;
 
+        usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED);
+
         mutex_unlock(&udc_lock);
 
         return 0;
@@ -406,6 +418,16 @@ static ssize_t usb_udc_softconn_store(struct device *dev,
 }
 static DEVICE_ATTR(soft_connect, S_IWUSR, NULL, usb_udc_softconn_store);
 
+static ssize_t usb_gadget_state_show(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct usb_udc          *udc = container_of(dev, struct usb_udc, dev);
+        struct usb_gadget       *gadget = udc->gadget;
+
+        return sprintf(buf, "%s\n", usb_state_string(gadget->state));
+}
+static DEVICE_ATTR(state, S_IRUGO, usb_gadget_state_show, NULL);
+
 #define USB_UDC_SPEED_ATTR(name, param)                                 \
 ssize_t usb_udc_##param##_show(struct device *dev,                      \
                 struct device_attribute *attr, char *buf)               \
@@ -439,6 +461,7 @@ static USB_UDC_ATTR(a_alt_hnp_support);
 static struct attribute *usb_udc_attrs[] = {
         &dev_attr_srp.attr,
         &dev_attr_soft_connect.attr,
+        &dev_attr_state.attr,
         &dev_attr_current_speed.attr,
         &dev_attr_maximum_speed.attr,
 
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 2e297e80d59a..32b734d88d6b 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -482,6 +482,7 @@ struct usb_gadget_ops {
  * @speed: Speed of current connection to USB host.
  * @max_speed: Maximal speed the UDC can handle.  UDC must support this
  *      and all slower speeds.
+ * @state: the state we are now (attached, suspended, configured, etc)
  * @sg_supported: true if we can handle scatter-gather
  * @is_otg: True if the USB device port uses a Mini-AB jack, so that the
  *      gadget driver must provide a USB OTG descriptor.
@@ -525,6 +526,7 @@ struct usb_gadget {
         struct list_head                ep_list;        /* of usb_ep */
         enum usb_device_speed           speed;
         enum usb_device_speed           max_speed;
+        enum usb_device_state           state;
         unsigned                        sg_supported:1;
         unsigned                        is_otg:1;
         unsigned                        is_a_peripheral:1;
@@ -959,6 +961,13 @@ extern void usb_gadget_unmap_request(struct usb_gadget *gadget,
 
 /*-------------------------------------------------------------------------*/
 
+/* utility to set gadget state properly */
+
+extern void usb_gadget_set_state(struct usb_gadget *gadget,
+                enum usb_device_state state);
+
+/*-------------------------------------------------------------------------*/
+
 /* utility wrapping a simple endpoint selection policy */
 
 extern struct usb_ep *usb_ep_autoconfig(struct usb_gadget *,