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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.

Change-Id: I2279d9083bf9093f5a96c16df5d7ae48d11fd503
Signed-off-by: Abdulhadi Mohamed <abdulahhadi2@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Git-commit: b3c4ec71ec413c2e5bfb028bdf1737af07f1fde0
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>
This commit is contained in:
Abdulhadi Mohamed 2017-07-19 16:31:10 +01:00 • committed by Gerrit - the friendly Code Review server
parent b3b13a88db
commit fda16fc183
2 changed files with 22 additions and 1 deletions
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17
drivers/usb/gadget/function/f_hid.c
View file

@ -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);

6
include/linux/hid.h
View file

@ -344,6 +344,12 @@ struct hid_item {
#define HID_GROUP_WACOM 0x0101
#define HID_GROUP_LOGITECH_DJ_DEVICE 0x0102
/*
* HID protocol status
*/
#define HID_REPORT_PROTOCOL 1
#define HID_BOOT_PROTOCOL 0
/*
* This is the global environment of the parser. This information is
* persistent for main-items. The global environment can be saved and