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usb: gadget: printer: add req_match for printer function 

Verify that a given usb_ctrlrequest is meant for printer function.
The following parts of the request are tested:

- bmRequestType:Data transfer direction
- bmRequestType:Type
- bmRequestType:Recipient
- bRequest
- wValue for bRequest 1 and 2
- wLength

Additionally, the request is considered meant for this function
iff the decoded interface number matches dev->interface.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Andrzej Pietrasiewicz 2015-03-03 10:52:25 +01:00 committed by Felipe Balbi
parent d7239f4c6d
commit 636bc0ed27
1 changed files with 36 additions and 0 deletions
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36
drivers/usb/gadget/legacy/printer.c
View File

@ -974,6 +974,41 @@ static void printer_soft_reset(struct printer_dev *dev)
/*-------------------------------------------------------------------------*/
static bool gprinter_req_match(struct usb_function *f,
const struct usb_ctrlrequest *ctrl)
{
struct printer_dev *dev = func_to_printer(f);
u16 w_index = le16_to_cpu(ctrl->wIndex);
u16 w_value = le16_to_cpu(ctrl->wValue);
u16 w_length = le16_to_cpu(ctrl->wLength);
if ((ctrl->bRequestType & USB_RECIP_MASK) != USB_RECIP_INTERFACE ||
(ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
return false;
switch (ctrl->bRequest) {
case GET_DEVICE_ID:
w_index >>= 8;
if (w_length <= PNP_STRING_LEN &&
(USB_DIR_IN & ctrl->bRequestType))
break;
return false;
case GET_PORT_STATUS:
if (!w_value && w_length == 1 &&
(USB_DIR_IN & ctrl->bRequestType))
break;
return false;
case SOFT_RESET:
if (!w_value && !w_length &&
(USB_DIR_OUT & ctrl->bRequestType))
break;
/* fall through */
default:
return false;
}
return w_index == dev->interface;
}
/*
* The setup() callback implements all the ep0 functionality that's not
* handled lower down.
@ -1251,6 +1286,7 @@ static int f_printer_bind_config(struct usb_configuration *c, char *pnp_str,
dev->function.unbind = printer_func_unbind;
dev->function.set_alt = printer_func_set_alt;
dev->function.disable = printer_func_disable;
dev->function.req_match = gprinter_req_match;
INIT_LIST_HEAD(&dev->tx_reqs);
INIT_LIST_HEAD(&dev->rx_reqs);
INIT_LIST_HEAD(&dev->rx_buffers);