diff options
| -rw-r--r-- | drivers/usb/core/message.c | 47 | ||||
| -rw-r--r-- | include/linux/usb.h | 5 |
2 files changed, 43 insertions, 9 deletions
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c index 7e95db70bba0..ebaea514161f 100644 --- a/drivers/usb/core/message.c +++ b/drivers/usb/core/message.c @@ -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); + + 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; + } - if (ret == 2) { - *(u16 *) data = le16_to_cpu(*status); - ret = 0; - } else if (ret >= 0) { + *(u16 *) data = le16_to_cpu(*(__le16 *) status); + break; + default: ret = -EIO; } + kfree(status); return ret; } diff --git a/include/linux/usb.h b/include/linux/usb.h index e86b6a2a35e4..6228d8177bfe 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -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, |