common: Add the CMD_ENV_EXISTS config to Kconfig

[karo-tx-uboot.git] / common / usb.c

diff --git a/common/usb.c b/common/usb.c
index 1b26bfab367d2675a2dcc79bc62e81cc66762714..7ff8ac5df364f6cb78ec3e522948402c969f3104 100644 (file)
--- a/common/usb.c
+++ b/common/usb.c
@@ -148,6 +148,32 @@ int usb_stop(void)
        return 0;
 }
 
+/******************************************************************************
+ * Detect if a USB device has been plugged or unplugged.
+ */
+int usb_detect_change(void)
+{
+       int i, j;
+       int change = 0;
+
+       for (j = 0; j < USB_MAX_DEVICE; j++) {
+               for (i = 0; i < usb_dev[j].maxchild; i++) {
+                       struct usb_port_status status;
+
+                       if (usb_get_port_status(&usb_dev[j], i + 1,
+                                               &status) < 0)
+                               /* USB request failed */
+                               continue;
+
+                       if (le16_to_cpu(status.wPortChange) &
+                           USB_PORT_STAT_C_CONNECTION)
+                               change++;
+               }
+       }
+
+       return change;
+}
+
 /*
  * disables the asynch behaviour of the control message. This is used for data
  * transfers that uses the exclusiv access to the control and bulk messages.
@@ -192,6 +218,7 @@ int usb_control_msg(struct usb_device *dev, unsigned int pipe,
                        void *data, unsigned short size, int timeout)
 {
        ALLOC_CACHE_ALIGN_BUFFER(struct devrequest, setup_packet, 1);
+       int err;
 
        if ((timeout == 0) && (!asynch_allowed)) {
                /* request for a asynch control pipe is not allowed */
@@ -209,8 +236,9 @@ int usb_control_msg(struct usb_device *dev, unsigned int pipe,
              request, requesttype, value, index, size);
        dev->status = USB_ST_NOT_PROC; /*not yet processed */
 
-       if (submit_control_msg(dev, pipe, data, size, setup_packet) < 0)
-               return -EIO;
+       err = submit_control_msg(dev, pipe, data, size, setup_packet);
+       if (err < 0)
+               return err;
        if (timeout == 0)
                return (int)size;
 
@@ -931,8 +959,6 @@ static int get_descriptor_len(struct usb_device *dev, int len, int expect_len)
 
 static int usb_setup_descriptor(struct usb_device *dev, bool do_read)
 {
-       __maybe_unused struct usb_device_descriptor *desc;
-
        /*
         * This is a Windows scheme of initialization sequence, with double
         * reset of the device (Linux uses the same sequence)