HID: Add Support for Setting and Getting Feature Reports from hidraw

Per the HID Specification, Feature reports must be sent and received on
the Configuration endpoint (EP 0) through the Set_Report/Get_Report
interfaces.  This patch adds two ioctls to hidraw to set and get feature
reports to and from the device.  Modifications were made to hidraw and
usbhid.

New hidraw ioctls:
  HIDIOCSFEATURE - Perform a Set_Report transfer of a Feature report.
  HIDIOCGFEATURE - Perform a Get_Report transfer of a Feature report.

Signed-off-by: Alan Ott <alan@signal11.us>
Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

2 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/hid.h b/include/linux/hid.h
index d91c25e253c8..e8ee0a93bda3 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -504,6 +504,9 @@ struct hid_device {							/* device report descriptor */
                                   struct hid_usage *, __s32);
         void (*hiddev_report_event) (struct hid_device *, struct hid_report *);
 
+        /* handler for raw input (Get_Report) data, used by hidraw */
+        int (*hid_get_raw_report) (struct hid_device *, unsigned char, __u8 *, size_t, unsigned char);
+
         /* handler for raw output data, used by hidraw */
         int (*hid_output_raw_report) (struct hid_device *, __u8 *, size_t, unsigned char);
 
diff --git a/include/linux/hidraw.h b/include/linux/hidraw.h
index dd8d69269176..4b88e697c4e9 100644
--- a/include/linux/hidraw.h
+++ b/include/linux/hidraw.h
@@ -35,6 +35,9 @@ struct hidraw_devinfo {
 #define HIDIOCGRAWINFO          _IOR('H', 0x03, struct hidraw_devinfo)
 #define HIDIOCGRAWNAME(len)     _IOC(_IOC_READ, 'H', 0x04, len)
 #define HIDIOCGRAWPHYS(len)     _IOC(_IOC_READ, 'H', 0x05, len)
+/* The first byte of SFEATURE and GFEATURE is the report number */
+#define HIDIOCSFEATURE(len)    _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x06, len)
+#define HIDIOCGFEATURE(len)    _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x07, len)
 
 #define HIDRAW_FIRST_MINOR 0
 #define HIDRAW_MAX_DEVICES 64