modpost: add support for hid

Generate aliases for hid device modules to support autoloading.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

3 files changed, 29 insertions, 0 deletions

diff --git a/include/linux/hid.h b/include/linux/hid.h
index ac4e678a04ed..b7a17762a0b2 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -67,6 +67,7 @@
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/list.h>
+#include <linux/mod_devicetable.h> /* hid_device_id */
 #include <linux/timer.h>
 #include <linux/workqueue.h>
 #include <linux/input.h>
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 3481a7d5bc0a..d6a3f47e95cb 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -131,6 +131,16 @@ struct usb_device_id {
 #define USB_DEVICE_ID_MATCH_INT_SUBCLASS        0x0100
 #define USB_DEVICE_ID_MATCH_INT_PROTOCOL        0x0200
 
+#define HID_ANY_ID                              (~0)
+
+struct hid_device_id {
+        __u16 bus;
+        __u32 vendor;
+        __u32 product;
+        kernel_ulong_t driver_data
+                __attribute__((aligned(sizeof(kernel_ulong_t))));
+};
+
 /* s390 CCW devices */
 struct ccw_device_id {
         __u16   match_flags;    /* which fields to match against */
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index 473f94e56ead..d4dc222a74f3 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -206,6 +206,20 @@ static void do_usb_table(void *symval, unsigned long size,
                 do_usb_entry_multi(symval + i, mod);
 }
 
+/* Looks like: hid:bNvNpN */
+static int do_hid_entry(const char *filename,
+                             struct hid_device_id *id, char *alias)
+{
+        id->vendor = TO_NATIVE(id->vendor);
+        id->product = TO_NATIVE(id->product);
+
+        sprintf(alias, "hid:b%04X", id->bus);
+        ADD(alias, "v", id->vendor != HID_ANY_ID, id->vendor);
+        ADD(alias, "p", id->product != HID_ANY_ID, id->product);
+
+        return 1;
+}
+
 /* Looks like: ieee1394:venNmoNspNverN */
 static int do_ieee1394_entry(const char *filename,
                              struct ieee1394_device_id *id, char *alias)
@@ -745,6 +759,10 @@ void handle_moddevtable(struct module *mod, struct elf_info *info,
         else if (sym_is(symname, "__mod_usb_device_table"))
                 /* special case to handle bcdDevice ranges */
                 do_usb_table(symval, sym->st_size, mod);
+        else if (sym_is(symname, "__mod_hid_device_table"))
+                do_table(symval, sym->st_size,
+                         sizeof(struct hid_device_id), "hid",
+                         do_hid_entry, mod);
         else if (sym_is(symname, "__mod_ieee1394_device_table"))
                 do_table(symval, sym->st_size,
                          sizeof(struct ieee1394_device_id), "ieee1394",