usb: gadget: introduce gadget state tracking
that's useful information to expose to userland.
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/gadget/udc-core.c b/drivers/usb/gadget/udc-core.c
index 40b1d88..8a1eeb2 100644
--- a/drivers/usb/gadget/udc-core.c
+++ b/drivers/usb/gadget/udc-core.c
@@ -101,6 +101,16 @@
/* ------------------------------------------------------------------------- */
+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 @@
if (ret)
goto err4;
+ usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED);
+
mutex_unlock(&udc_lock);
return 0;
@@ -406,6 +418,16 @@
}
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 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 2e297e8..32b734d 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -482,6 +482,7 @@
* @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 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 @@
/*-------------------------------------------------------------------------*/
+/* 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 *,
