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usb: gadget: f_hid: {GET,SET} PROTOCOL Support

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The current f_hid driver doesn't handle GET_PROCOTOL and
SET_PROCOTOL requests, which are required to operate HID
gadgets in BOOT mode. This patch implements this feature for
devices that have the same implementation for REPORT and BOOT mode
so that these devices are recognized by older BIOSes.

Signed-off-by: Abdulhadi Mohamed <abdulahhadi2@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Abdulhadi Mohamed
2017-07-19 16:31:10 +01:00
committed by Felipe Balbi
parent 4a10a937ed
commit b3c4ec71ec
2 changed files with 22 additions and 1 deletions
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17
drivers/usb/gadget/function/f_hid.c
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@@ -44,6 +44,7 @@ struct f_hidg {
/* configuration */
unsigned char bInterfaceSubClass;
unsigned char bInterfaceProtocol;
unsigned char protocol;
unsigned short report_desc_length;
char *report_desc;
unsigned short report_length;
@@ -527,7 +528,9 @@ static int hidg_setup(struct usb_function *f,
case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
| HID_REQ_GET_PROTOCOL):
VDBG(cdev, "get_protocol\n");
goto stall;
length = min_t(unsigned int, length, 1);
((u8 *) req->buf)[0] = hidg->protocol;
goto respond;
break;
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
@@ -539,6 +542,17 @@ static int hidg_setup(struct usb_function *f,
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
| HID_REQ_SET_PROTOCOL):
VDBG(cdev, "set_protocol\n");
if (value > HID_REPORT_PROTOCOL)
goto stall;
length = 0;
/*
* We assume that programs implementing the Boot protocol
* are also compatible with the Report Protocol
*/
if (hidg->bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT) {
hidg->protocol = value;
goto respond;
}
goto stall;
break;
@@ -768,6 +782,7 @@ static int hidg_bind(struct usb_configuration *c, struct usb_function *f)
/* set descriptor dynamic values */
hidg_interface_desc.bInterfaceSubClass = hidg->bInterfaceSubClass;
hidg_interface_desc.bInterfaceProtocol = hidg->bInterfaceProtocol;
hidg->protocol = HID_REPORT_PROTOCOL;
hidg_ss_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length);
hidg_ss_in_comp_desc.wBytesPerInterval =
cpu_to_le16(hidg->report_length);