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usb: core: add a 'type' parameter to usb_get_status() 

This new 'type' parameter will allows interested drivers to request
for PTM status or Standard status.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Felipe Balbi 2017-11-02 10:57:41 +02:00 committed by Greg Kroah-Hartman
parent d9e1e1484a
commit 2e43f0fe37
2 changed files with 43 additions and 9 deletions
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47
drivers/usb/core/message.c
View File

@ -919,6 +919,7 @@ int usb_get_device_descriptor(struct usb_device *dev, unsigned int size)
* usb_get_status - issues a GET_STATUS call
* @dev: the device whose status is being checked
* @recip: USB_RECIP_*; for device, interface, or endpoint
* @type: USB_STATUS_TYPE_*; for standard or PTM status types
* @target: zero (for device), else interface or endpoint number
* @data: pointer to two bytes of bitmap data
* Context: !in_interrupt ()
@ -937,24 +938,56 @@ int usb_get_device_descriptor(struct usb_device *dev, unsigned int size)
* Returns 0 and the status value in *@data (in host byte order) on success,
* or else the status code from the underlying usb_control_msg() call.
*/
int usb_get_status(struct usb_device *dev, int recip, int target, void *data)
int usb_get_status(struct usb_device *dev, int recip, int type, int target,
void *data)
{
int ret;
__le16 *status = kmalloc(sizeof(*status), GFP_KERNEL);
void *status;
int length;
switch (type) {
case USB_STATUS_TYPE_STANDARD:
length = 2;
break;
case USB_STATUS_TYPE_PTM:
if (recip != USB_RECIP_DEVICE)
return -EINVAL;
length = 4;
break;
default:
return -EINVAL;
}
status = kmalloc(length, GFP_KERNEL);
if (!status)
return -ENOMEM;
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_STATUS, USB_DIR_IN | recip, USB_STATUS_TYPE_STANDARD,
target, status, sizeof(*status), USB_CTRL_GET_TIMEOUT);
target, status, length, USB_CTRL_GET_TIMEOUT);
if (ret == 2) {
*(u16 *) data = le16_to_cpu(*status);
ret = 0;
} else if (ret >= 0) {
switch (ret) {
case 4:
if (type != USB_STATUS_TYPE_PTM) {
ret = -EIO;
break;
}
*(u32 *) data = le32_to_cpu(*(__le32 *) status);
break;
case 2:
if (type != USB_STATUS_TYPE_STANDARD) {
ret = -EIO;
break;
}
*(u16 *) data = le16_to_cpu(*(__le16 *) status);
break;
default:
ret = -EIO;
}
kfree(status);
return ret;
}

5
include/linux/usb.h
View File

@ -1766,12 +1766,13 @@ extern int usb_bulk_msg(struct usb_device *usb_dev, unsigned int pipe,
extern int usb_get_descriptor(struct usb_device *dev, unsigned char desctype,
unsigned char descindex, void *buf, int size);
extern int usb_get_status(struct usb_device *dev,
int recip, int target, void *data);
int recip, int type, int target, void *data);
static inline int usb_get_std_status(struct usb_device *dev,
int recip, int target, void *data)
{
return usb_get_status(dev, recip, target, data);
return usb_get_status(dev, recip, USB_STATUS_TYPE_STANDARD, target,
data);
}
extern int usb_string(struct usb_device *dev, int index,