[PATCH] usb: gadget: Allow function access to device ID data during bind()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



This is a patch that makes sure that the device ID data (idVendor,
idProduct and bcdDevice) are assigned to the descriptor in the cdev
structure *before* the composite gadget starts binding. This allows the
composite driver, and all the composite functions it uses, access to
that data.

In one of the composite functions we created, we needed to register an
input device and wanted to use the idVendor, idProduct and bcdDevice
codes to properly initialize the id field of the input device. We could
not do that because the idVendor, idProduct and bcdDevice values were
only set in the cdec structure *after* the composite->bind(cdev) call.

Signed-off-by: Robert Lukassen <robert.lukassen@xxxxxxxxxx>

diff --git a/drivers/usb/gadget/composite.c
b/drivers/usb/gadget/composite.c index 09289bb..65115da 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -1004,6 +1004,14 @@ static int __init composite_bind(struct
usb_gadget *gadget)
         */
        usb_ep_autoconfig_reset(cdev->gadget);
 
+       /* standardized runtime overrides for device ID data */
+       if (idVendor)
+               cdev->desc.idVendor = cpu_to_le16(idVendor);
+       if (idProduct)
+               cdev->desc.idProduct = cpu_to_le16(idProduct);
+       if (bcdDevice)
+               cdev->desc.bcdDevice = cpu_to_le16(bcdDevice);
+
        /* composite gadget needs to assign strings for whole device
(like
         * serial number), register function drivers, potentially update
         * power state and consumption, etc @@ -1015,14 +1023,6 @@
static int __init composite_bind(struct usb_gadget *gadget)
        cdev->desc = *composite->dev;
        cdev->desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
 
-       /* standardized runtime overrides for device ID data */
-       if (idVendor)
-               cdev->desc.idVendor = cpu_to_le16(idVendor);
-       if (idProduct)
-               cdev->desc.idProduct = cpu_to_le16(idProduct);
-       if (bcdDevice)
-               cdev->desc.bcdDevice = cpu_to_le16(bcdDevice);
-
        /* strings can't be assigned before bind() allocates the
         * releavnt identifiers
         */
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Media]     [Linux Input]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Old Linux USB Devel Archive]

  Powered by Linux