mirror of https://gitee.com/openkylin/linux.git
usb: gadget: Allow a non-SuperSpeed gadget to support LPM
This commit allows a gadget that does not support SuperSpeed to indicate that it supports LPM. It does this by setting the 'lpm_capable' flag in the gadget structure. If a gadget sets this, the composite gadget framework will set the bcdUSB to 0x0201 to indicate that this supports BOS descriptors, and also return a USB 2.0 Extension descriptor as part of the BOS descriptor set. See USB 2.0 LPM ECN Section 3. Signed-off-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Sevak Arakelyan <sevaka@synopsys.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
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@ -1608,7 +1608,10 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
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cdev->desc.bcdUSB = cpu_to_le16(0x0210);
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}
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} else {
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cdev->desc.bcdUSB = cpu_to_le16(0x0200);
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if (gadget->lpm_capable)
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cdev->desc.bcdUSB = cpu_to_le16(0x0201);
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else
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cdev->desc.bcdUSB = cpu_to_le16(0x0200);
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}
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value = min(w_length, (u16) sizeof cdev->desc);
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@ -1639,7 +1642,8 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
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value = min(w_length, (u16) value);
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break;
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case USB_DT_BOS:
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if (gadget_is_superspeed(gadget)) {
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if (gadget_is_superspeed(gadget) ||
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gadget->lpm_capable) {
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value = bos_desc(cdev);
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value = min(w_length, (u16) value);
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}
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@ -352,6 +352,8 @@ struct usb_gadget_ops {
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* @deactivated: True if gadget is deactivated - in deactivated state it cannot
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* be connected.
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* @connected: True if gadget is connected.
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* @lpm_capable: If the gadget max_speed is FULL or HIGH, this flag
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* indicates that it supports LPM as per the LPM ECN & errata.
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*
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* Gadgets have a mostly-portable "gadget driver" implementing device
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* functions, handling all usb configurations and interfaces. Gadget
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@ -404,6 +406,7 @@ struct usb_gadget {
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unsigned is_selfpowered:1;
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unsigned deactivated:1;
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unsigned connected:1;
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unsigned lpm_capable:1;
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};
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#define work_to_gadget(w) (container_of((w), struct usb_gadget, work))
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