Date:	Thu, 3 Aug 2006 18:06:08 +0800
From:	"liyu" <liyu@...ss.com.cn>
To:	"linux-kernel" <linux-kernel@...r.kernel.org>
Subject: [PATCH] usb: The HID Simple Driver Interface 0.3.0

You can see one example in  "[PATCH] usb: Microsoft Natural Ergonomic Keyboard 4000 Driver 0.3.0"

Changelogs: ( upto 20060803)

	1. Release version 0.3.0.	

Changelogs: ( upto 20060728)

	1. Fixed the inline function redefine error.
	2. Fixed the bug that access invalid address hidinput_simple_driver_pop().
	
Signed-off-by: Liyu <liyu@...ss.com.cn>

diff -Naurp linux-2.6.17.7/drivers/usb/input.orig/hid-core.c linux-2.6.17.7/drivers/usb/input/hid-core.c
--- linux-2.6.17.7/drivers/usb/input.orig/hid-core.c	2006-07-25 11:36:01.000000000 +0800
+++ linux-2.6.17.7/drivers/usb/input/hid-core.c	2006-08-03 15:44:45.000000000 +0800
@@ -4,6 +4,7 @@
  *  Copyright (c) 1999 Andreas Gal
  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@...e.cz>
  *  Copyright (c) 2005 Michael Haboustak <mike-@...ci.rr.com> for Concept2, Inc
+ *  Copyright (c) 2006 Liyu <liyu@...ss.com.cn>  HID simple driver interface
  */
 
 /*
@@ -26,6 +27,7 @@
 #include <asm/byteorder.h>
 #include <linux/input.h>
 #include <linux/wait.h>
+#include <asm/semaphore.h>
 
 #undef DEBUG
 #undef DEBUG_DATA
@@ -33,6 +35,7 @@
 #include <linux/usb.h>
 
 #include "hid.h"
+#include "hid-simple.h"
 #include <linux/hiddev.h>
 
 /*
@@ -46,6 +49,15 @@
 
 static char *hid_types[] = {"Device", "Pointer", "Mouse", "Device", "Joystick",
 				"Gamepad", "Keyboard", "Keypad", "Multi-Axis Controller"};
+
+/*
+ * The global data structure for simple device driver interface.
+ */
+static DECLARE_MUTEX(matched_lock);
+static DECLARE_MUTEX(simple_lock);
+static struct list_head matched_devices_list;
+static struct list_head simple_drivers_list;
+
 /*
  * Module parameters.
  */
@@ -785,8 +797,17 @@ static __inline__ int search(__s32 *arra
 static void hid_process_event(struct hid_device *hid, struct hid_field *field, struct hid_usage *usage, __s32 value, int interrupt, struct pt_regs *regs)
 {
 	hid_dump_input(usage, value);
-	if (hid->claimed & HID_CLAIMED_INPUT)
+	if (hid->claimed & HID_CLAIMED_INPUT) {
+		if (hid->simple) {
+			if (hid->simple->pre_event &&
+				!hid->simple->pre_event(hid, field, usage, 
+								value, regs))
+			return;
+		}
 		hidinput_hid_event(hid, field, usage, value, regs);
+		if (hid->simple && hid->simple->post_event)
+			hid->simple->post_event(hid, field, usage, value, regs);
+	}
 	if (hid->claimed & HID_CLAIMED_HIDDEV && interrupt)
 		hiddev_hid_event(hid, field, usage, value, regs);
 }
@@ -832,7 +853,6 @@ static void hid_input_field(struct hid_d
 			&& field->usage[field->value[n] - min].hid
 			&& search(value, field->value[n], count))
 				hid_process_event(hid, field, &field->usage[field->value[n] - min], 0, interrupt, regs);
-
 		if (value[n] >= min && value[n] <= max
 			&& field->usage[value[n] - min].hid
 			&& search(field->value, value[n], count))
@@ -1977,6 +1997,8 @@ fail:
 static void hid_disconnect(struct usb_interface *intf)
 {
 	struct hid_device *hid = usb_get_intfdata (intf);
+	struct list_head *node;
+	struct matched_device *matched;
 
 	if (!hid)
 		return;
@@ -1991,8 +2013,29 @@ static void hid_disconnect(struct usb_in
 	del_timer_sync(&hid->io_retry);
 	flush_scheduled_work();
 
-	if (hid->claimed & HID_CLAIMED_INPUT)
+	if (hid->claimed & HID_CLAIMED_INPUT) {
+		matched = NULL;
+		down(&matched_lock);
+		list_for_each(node, &matched_devices_list) {
+			matched = list_entry(node, struct matched_device, node);
+			if (matched->intf == intf) {
+				list_del(&matched->node);
+				break;
+			}
+			matched = NULL;
+		}
+		up(&matched_lock);
+		/* disconnect simple device driver if need */
+		if (matched && hid->simple) {
+			hidinput_simple_driver_disconnect(hid);
+			hidinput_simple_driver_pop(hid, matched);
+		}
+		if (matched) {
+			matched->intf = NULL;
+			kfree(matched);
+		}
 		hidinput_disconnect(hid);
+	}
 	if (hid->claimed & HID_CLAIMED_HIDDEV)
 		hiddev_disconnect(hid);
 
@@ -2005,12 +2048,143 @@ static void hid_disconnect(struct usb_in
 	hid_free_device(hid);
 }
 
+
+/* called when we unregister a hidinput simple device driver */
+static void
+hidinput_simple_driver_bind_foreach(void)
+{
+	struct hidinput_simple_driver *simple;
+	struct matched_device *matched=NULL;
+	struct list_head *matched_node = NULL;
+	struct list_head *simple_node = NULL;
+	struct hid_device *hid=NULL;
+
+	down(&matched_lock);
+	list_for_each(matched_node, &matched_devices_list) {
+		matched = list_entry(matched_node, struct matched_device, node);
+		hid = usb_get_intfdata(matched->intf);
+		if (hid->simple)
+			continue;
+		down(&simple_lock);
+		list_for_each(simple_node, &simple_drivers_list) {
+			simple = list_entry(simple_node, struct hidinput_simple_driver, node);
+			if (!usb_match_id(matched->intf, simple->id_table))
+				continue;
+			if (hidinput_simple_driver_connect(simple, hid))
+				continue;
+			if (hidinput_simple_driver_push(hid, simple, matched))
+				continue;
+			hidinput_simple_driver_setup_usage(hid);
+			printk(KERN_INFO"The simple HID driver \'%s\' attach on"
+								"\'%s\'\n",
+								simple->name,
+								hid->name);
+		}
+		up(&simple_lock);
+	}
+	up(&matched_lock);
+	
+}
+
+/* called in hid_probe() */
+static void
+hidinput_simple_driver_bind(struct matched_device *matched)
+{
+	struct hidinput_simple_driver *simple;
+	struct list_head *node;
+	struct hid_device *hid;
+	
+	if (!matched->intf)
+		return;
+	hid = usb_get_intfdata (matched->intf);
+	if (hid->simple)
+		return;
+
+	simple = NULL;
+	down(&simple_lock);
+	list_for_each(node, &simple_drivers_list) {
+		simple = list_entry(node, struct hidinput_simple_driver, node);
+		if (usb_match_id(matched->intf, simple->id_table))
+			break;
+		simple = NULL;
+	}
+	up(&simple_lock);
+	
+	if (!simple) 
+		return;
+	if (hidinput_simple_driver_connect(simple, hid))
+		return;
+	if (hidinput_simple_driver_push(hid, simple, matched))
+		return;
+	hidinput_simple_driver_setup_usage(hid);
+
+	printk(KERN_INFO"The simple HID driver \'%s\' attach on \'%s\'\n", 
+						simple->name, hid->name);
+}
+
+int
+hidinput_register_simple_driver(struct hidinput_simple_driver *simple)
+{
+	struct list_head *node=NULL;
+	struct matched_device *matched;
+	struct hid_device *hid=NULL;
+	int ret=0;
+
+	if (!simple || !simple->name)
+		return -EINVAL;
+
+	hidinput_simple_driver_init(simple);
+
+	down(&matched_lock);
+	list_for_each(node, &matched_devices_list) {
+		matched = list_entry(node, struct matched_device, node);
+		hid = usb_get_intfdata (matched->intf);
+		if (hid->simple)
+			continue;
+		if (!usb_match_id(matched->intf, simple->id_table))
+			continue;
+		if (hidinput_simple_driver_connect(simple, hid))
+			continue;
+		if (hidinput_simple_driver_push(hid, simple, matched))
+			continue;
+		hidinput_simple_driver_setup_usage(hid);
+		ret = 0;
+		printk(KERN_INFO"The simple HID driver \'%s\' attach on"
+							" \'%s\'.\n",
+						 simple->name, hid->name);
+	}
+	up(&matched_lock);
+
+	down(&simple_lock);
+	list_add(&simple->node, &simple_drivers_list);
+	up(&simple_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(hidinput_register_simple_driver);
+
+void
+hidinput_unregister_simple_driver(struct hidinput_simple_driver *simple)
+{
+	hidinput_simple_driver_clear(simple);
+	down(&simple_lock);
+	list_del(&simple->node);
+	up(&simple_lock);
+	/* to active simple device driver that it is waiting */
+	hidinput_simple_driver_bind_foreach();
+	printk(KERN_INFO"The simple HID driver \'%s\' unregistered.\n", 
+							simple->name);
+}
+
+EXPORT_SYMBOL_GPL(hidinput_unregister_simple_driver);
+
 static int hid_probe(struct usb_interface *intf, const struct usb_device_id *id)
 {
 	struct hid_device *hid;
 	char path[64];
 	int i;
 	char *c;
+	struct matched_device *matched;
 
 	dbg("HID probe called for ifnum %d",
 			intf->altsetting->desc.bInterfaceNumber);
@@ -2021,13 +2195,22 @@ static int hid_probe(struct usb_interfac
 	hid_init_reports(hid);
 	hid_dump_device(hid);
 
-	if (!hidinput_connect(hid))
+	usb_set_intfdata(intf, hid);
+
+	if (!hidinput_connect(hid)) {
+		matched = kmalloc(sizeof(struct matched_device), GFP_KERNEL);
+		if (matched) {
+			matched->intf = intf;
+			down(&matched_lock);
+			list_add(&matched->node, &matched_devices_list);
+			up(&matched_lock);
+			hidinput_simple_driver_bind(matched);
+		}
 		hid->claimed |= HID_CLAIMED_INPUT;
+	}
 	if (!hiddev_connect(hid))
 		hid->claimed |= HID_CLAIMED_HIDDEV;
 
-	usb_set_intfdata(intf, hid);
-
 	if (!hid->claimed) {
 		printk ("HID device not claimed by input or hiddev\n");
 		hid_disconnect(intf);
@@ -2108,6 +2291,8 @@ static int __init hid_init(void)
 	retval = hiddev_init();
 	if (retval)
 		goto hiddev_init_fail;
+	INIT_LIST_HEAD(&matched_devices_list);
+	INIT_LIST_HEAD(&simple_drivers_list);
 	retval = usb_register(&hid_driver);
 	if (retval)
 		goto usb_register_fail;
@@ -2122,7 +2307,15 @@ hiddev_init_fail:
 
 static void __exit hid_exit(void)
 {
+	struct list_head *node, *tmp;
+	struct matched_device *matched;
+	
 	usb_deregister(&hid_driver);
+	list_for_each_safe(node, tmp, &matched_devices_list) {
+		matched = list_entry(node, struct matched_device, node);
+		list_del(&matched->node);
+		kfree(matched);
+	}
 	hiddev_exit();
 }
 
diff -Naurp linux-2.6.17.7/drivers/usb/input.orig/hid.h linux-2.6.17.7/drivers/usb/input/hid.h
--- linux-2.6.17.7/drivers/usb/input.orig/hid.h	2006-07-25 11:36:01.000000000 +0800
+++ linux-2.6.17.7/drivers/usb/input/hid.h	2006-08-03 15:23:15.000000000 +0800
@@ -6,6 +6,7 @@
  *
  *  Copyright (c) 1999 Andreas Gal
  *  Copyright (c) 2000-2001 Vojtech Pavlik
+ *  Copyright (c) 2006 Liyu     To support simple HID device.
  */
 
 /*
@@ -380,8 +381,11 @@ struct hid_input {
 	struct list_head list;
 	struct hid_report *report;
 	struct input_dev *input;
+	void *private;
 };
 
+struct hidinput_simple_driver;
+
 struct hid_device {							/* device report descriptor */
 	 __u8 *rdesc;
 	unsigned rsize;
@@ -445,6 +449,8 @@ struct hid_device {							/* device repo
 	int (*ff_event)(struct hid_device *hid, struct input_dev *input,
 			unsigned int type, unsigned int code, int value);
 
+	struct hidinput_simple_driver *simple;
+
 #ifdef CONFIG_USB_HIDINPUT_POWERBOOK
 	unsigned long pb_pressed_fn[NBITS(KEY_MAX)];
 	unsigned long pb_pressed_numlock[NBITS(KEY_MAX)];
diff -Naurp linux-2.6.17.7/drivers/usb/input.orig/hid-input.c linux-2.6.17.7/drivers/usb/input/hid-input.c
--- linux-2.6.17.7/drivers/usb/input.orig/hid-input.c	2006-07-25 11:36:01.000000000 +0800
+++ linux-2.6.17.7/drivers/usb/input/hid-input.c	2006-08-03 17:26:48.000000000 +0800
@@ -2,6 +2,7 @@
  * $Id: hid-input.c,v 1.2 2002/04/23 00:59:25 rdamazio Exp $
  *
  *  Copyright (c) 2000-2001 Vojtech Pavlik
+ *  Copyright (c) 2006 Liyu <liyu@...ss.com.cn>  HID simple driver interface
  *
  *  USB HID to Linux Input mapping
  */
@@ -36,6 +37,7 @@
 #undef DEBUG
 
 #include "hid.h"
+#include "hid-simple.h"
 
 #define unk	KEY_UNKNOWN
 
@@ -63,6 +65,8 @@ static const struct {
 	__s32 y;
 }  hid_hat_to_axis[] = {{ 0, 0}, { 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
 
+typedef void (*do_usage_t)(struct hid_field *, struct hid_usage *);
+
 #define map_abs(c)	do { usage->code = c; usage->type = EV_ABS; bit = input->absbit; max = ABS_MAX; } while (0)
 #define map_rel(c)	do { usage->code = c; usage->type = EV_REL; bit = input->relbit; max = REL_MAX; } while (0)
 #define map_key(c)	do { usage->code = c; usage->type = EV_KEY; bit = input->keybit; max = KEY_MAX; } while (0)
@@ -849,6 +853,245 @@ int hidinput_connect(struct hid_device *
 	return 0;
 }
 
+int
+hidinput_simple_driver_init(struct hidinput_simple_driver *drv)
+{
+	if (unlikely(!drv))
+		return -EINVAL;
+	INIT_LIST_HEAD(&drv->node);
+	INIT_LIST_HEAD(&drv->raw_devices);
+	drv->flags = 0;
+	return 0;
+}
+
+#define SET_BIT (1)
+#define CLR_BIT (0)
+static void inline
+hidinput_simple_configure_one_usage(int op, struct input_dev *input, struct hid_usage *usage, struct usage_block *usage_block)
+{
+	unsigned long *bits;
+
+	switch (usage_block->event) {
+		case EV_KEY:
+			bits = input->keybit;	break;
+		case EV_REL:
+			bits = input->relbit;	break;
+		case EV_ABS:
+			bits = input->relbit;	break;
+		case EV_MSC:
+			bits = input->absbit;	break;
+		case EV_SW:
+			bits = input->swbit;	break;
+		case EV_LED:
+			bits = input->ledbit;	break;
+		case EV_SND:
+			bits = input->sndbit;	break;
+		case EV_FF:
+			bits = input->ffbit;	break;
+		default:
+			return;
+	}
+
+	if (SET_BIT == op) {
+		usage->code = usage_block->code;
+		usage->type = usage_block->event;
+		set_bit(usage_block->code, bits);
+	}
+	else if (CLR_BIT == op) {
+		usage->code = 0;
+		usage->type = 0;
+		clear_bit(usage_block->code, bits);
+	}
+}
+
+static do_usage_t
+hidinput_simple_driver_configure_usage_prep(struct hid_device *hid, int *op)
+{
+	do_usage_t do_usage;
+
+	if (!hid->simple)
+		return NULL;
+
+	if (hid->simple->flags & HIDINPUT_SIMPLE_SETUP_USAGE) {
+		do_usage = hid->simple->setup_usage;
+		*op = SET_BIT;
+	}
+	else {
+		do_usage = hid->simple->clear_usage;
+		*op = CLR_BIT;
+	}
+	return do_usage;
+}
+
+static void
+__hidinput_simple_driver_configure_usage(int op,
+					struct hid_field *field,
+					struct hid_usage *hid_usage)
+{
+	struct input_dev *input = field->hidinput->input;
+	struct hid_device *hid = input->private;
+	struct usage_block *usage_block;
+	struct usage_page_block *page_block;
+	int page;
+	int usage;
+	
+	page = (hid_usage->hid & HID_USAGE_PAGE);
+	usage = (hid_usage->hid & HID_USAGE);
+	page_block = hid->simple->usage_page_table;
+
+	for (;page_block && page_block->usage_blockes;page_block++) {
+		if (page_block->page != page)
+			continue;
+		usage_block = page_block->usage_blockes;
+		for (; usage_block && usage_block->usage; usage_block++) {
+			if (usage_block->usage != usage)
+				continue;
+			hidinput_simple_configure_one_usage(op, input, 
+						hid_usage, usage_block);
+		}
+	}
+}
+
+/*
+ *  To give one simple device a configure usage chance.
+ *  The framework of this function come from hidinput_connect()
+ */
+void hidinput_simple_driver_configure_usage(struct hid_device *hid)
+{
+	struct hid_report *report;
+	int i, j, k;
+	do_usage_t do_usage;
+	int op;
+
+	if (!hid->simple)
+		return;
+
+	do_usage = hidinput_simple_driver_configure_usage_prep(hid, &op);
+
+	for (i = 0; i < hid->maxcollection; i++)
+		if (hid->collection[i].type == HID_COLLECTION_APPLICATION ||
+			hid->collection[i].type==HID_COLLECTION_PHYSICAL)
+			if (IS_INPUT_APPLICATION(hid->collection[i].usage))
+				break;
+
+	if (i == hid->maxcollection)
+		return;
+
+	for (k = HID_INPUT_REPORT; k <= HID_OUTPUT_REPORT; k++)
+		list_for_each_entry(report, &hid->report_enum[k].report_list, list) {
+			if (!report->maxfield)
+				continue;
+
+			for (i = 0; i < report->maxfield; i++)
+				for (j = 0; j < report->field[i]->maxusage; j++) {
+					__hidinput_simple_driver_configure_usage(
+									op,
+							report->field[i],
+						report->field[i]->usage + j);
+					if (do_usage)
+						do_usage(report->field[i],
+						report->field[i]->usage + j);
+				}
+		}
+
+	return;
+}
+#undef SET_BIT
+#undef CLR_BIT
+
+int
+hidinput_simple_driver_push(struct hid_device *hid, 
+				struct hidinput_simple_driver *simple,
+					struct matched_device *matched)
+{
+	struct raw_simple_device *raw_simple;
+	
+	raw_simple = kmalloc(sizeof(struct raw_simple_device), GFP_KERNEL);
+	if (!raw_simple)
+		return -ENOMEM;
+	raw_simple->intf = matched->intf;
+	hid = usb_get_intfdata(matched->intf);
+	hid->simple = simple;
+	list_add(&raw_simple->node, &simple->raw_devices);
+	return 0;
+}
+
+void
+hidinput_simple_driver_pop(struct hid_device *hid,
+				struct matched_device *matched)
+{
+	struct list_head *node;
+	struct raw_simple_device *raw_simple=NULL;
+
+	list_for_each (node, &hid->simple->raw_devices) {
+		raw_simple = list_entry(node, struct raw_simple_device, node);
+		if (raw_simple && raw_simple->intf == matched->intf) {
+			hid->simple = NULL;
+			list_del(&raw_simple->node);
+			kfree(raw_simple);
+			return;
+		}
+	}
+}
+
+void
+hidinput_simple_driver_clear(struct hidinput_simple_driver *simple)
+{
+	struct raw_simple_device *raw_simple;
+	struct hid_device *hid;
+
+	while (!list_empty_careful(&simple->raw_devices)) {
+		raw_simple = list_entry(simple->raw_devices.next, 
+					struct raw_simple_device, node);
+		hid = usb_get_intfdata (raw_simple->intf);
+	
+		if (hid->simple) {
+			BUG_ON(hid->simple != simple);
+			hid->simple = NULL;
+		}
+		hidinput_simple_driver_clear_usage(hid);
+		printk("device '%s' disconnect from one simple driver.\n",
+								hid->name);
+		hidinput_simple_driver_disconnect(hid);
+		list_del_init(simple->raw_devices.next);
+	}
+}
+
+/* modify from hidinput_disconnect() */ 
+int hidinput_simple_driver_connect(struct hidinput_simple_driver *simple, 
+						struct hid_device *hid)
+{
+	struct hid_input *hidinput, *next;
+	int ret = -ENODEV;
+
+	if (!simple)
+		return ret;
+	if (!simple->connect)
+		return 0;
+
+	list_for_each_entry_safe(hidinput, next, &hid->inputs, list) {
+		if (!simple->connect(hid, hidinput)) {
+			hid->simple = simple;
+			ret = 0;
+		}
+	}
+	return ret;
+}
+
+
+/* modify from hidinput_disconnect() */ 
+void hidinput_simple_driver_disconnect(struct hid_device *hid)
+{
+	struct hid_input *hidinput, *next;
+
+	if (!hid->simple || !hid->simple->disconnect)
+		return;
+
+	list_for_each_entry_safe(hidinput, next, &hid->inputs, list) {
+		hid->simple->disconnect(hid, hidinput);
+	}
+}
+
 void hidinput_disconnect(struct hid_device *hid)
 {
 	struct hid_input *hidinput, *next;
diff -Naurp linux-2.6.17.7/drivers/usb/input.orig/hid-simple.h linux-2.6.17.7/drivers/usb/input/hid-simple.h
--- linux-2.6.17.7/drivers/usb/input.orig/hid-simple.h	1970-01-01 08:00:00.000000000 +0800
+++ linux-2.6.17.7/drivers/usb/input/hid-simple.h	2006-08-03 17:27:10.000000000 +0800
@@ -0,0 +1,137 @@
+/*
+ *  NOTE:
+ *	For use me , you must include hid.h in your source first. 
+ */
+#ifndef __HID_SIMPLE_H
+#define __HID_SIMPLE_H
+
+#ifdef __KERNEL__
+
+#include <linux/usb.h>
+
+/***** The public interface for simple device driver *****/
+struct usage_page_block;
+
+struct hidinput_simple_driver {
+/* private */
+	struct list_head node; /* link with simple_drivers_list */
+	struct list_head raw_devices;
+	int flags;
+/* public */
+	char *name;
+	int (*connect)(struct hid_device *, struct hid_input *);	
+	void (*setup_usage)(struct hid_field *,   struct hid_usage *);
+	int (*pre_event)(const struct hid_device *, const struct hid_field *,
+					const struct hid_usage *, const __s32,
+					const struct pt_regs *regs);
+	int (*post_event)(const struct hid_device *, const struct hid_field *,
+					const struct hid_usage *, const __s32,
+					const struct pt_regs *regs);
+	void (*clear_usage)(struct hid_field *,   struct hid_usage *);
+	void (*disconnect)(struct hid_device *, struct hid_input *);
+	void *private;
+	struct usb_device_id *id_table;
+	struct usage_page_block *usage_page_table;
+};
+
+
+int hidinput_register_simple_driver(struct hidinput_simple_driver *device);
+void hidinput_unregister_simple_driver(struct hidinput_simple_driver *device);
+
+/********************* The public section end ***********/
+
+/***** The private section for simple device driver implement only *****/
+
+/* 
+ *  matched_device record one device which hid-subsystem handle, it may 
+ *  be one simple device can not handle.
+ *
+ *  The element of matched_device list is inserted at hidinput_connect(), 
+ *  and is removed  at hidinput_disconnect().
+ */ 
+struct matched_device {
+	struct usb_interface *intf;
+	struct list_head node;
+};
+
+/* 
+ *  raw_simple_driver record one device which hid simple device handle.
+ *  It used as one member of hid_simple_driver.
+ */ 
+
+struct raw_simple_device {
+	struct usb_interface *intf;
+	struct list_head node;
+};
+
+void hidinput_simple_driver_configure_usage(struct hid_device *hid);
+int hidinput_simple_driver_init(struct hidinput_simple_driver *simple);
+int hidinput_simple_driver_push(struct hid_device *hid,
+				struct hidinput_simple_driver *simple,
+				struct matched_device *dev);
+void hidinput_simple_driver_pop(struct hid_device *hid,
+				struct matched_device *dev);
+void hidinput_simple_driver_clear(struct hidinput_simple_driver *simple);
+int hidinput_simple_driver_connect(struct hidinput_simple_driver *simple, 
+							struct hid_device *hid);
+void hidinput_simple_driver_disconnect(struct hid_device *hid);
+
+struct usage_block {
+	int usage; /* usage code */
+	int value; /* not used, for F_EVENT_BY_VALUE in future  */
+	int event; /* input event type, e.g. EV_KEY. */
+	int code;  /* input subsystem code, e.g. KEY_F1. */
+	int flags; /* not used */
+};
+
+struct usage_page_block {
+	int page; /* usage page code */
+	int flags; /* not used */
+	struct usage_block *usage_blockes;
+};
+
+/* usage_block flags list */
+#define F_EVENT_BY_VALUE (0x1) /* submit input event by usage_block.value, 
+				  not implement yet */
+
+#define USAGE_BLOCK(i_usage, i_value, i_event, i_code, i_flags) \
+	{\
+		.usage = (i_usage),\
+		.value = (i_value),\
+		.event = (i_event),\
+		.code = (i_code),\
+		.flags = (i_flags),\
+	}
+
+#define USAGE_BLOCK_NULL {}
+
+#define USAGE_PAGE_BLOCK(i_page, i_usage_blockes) \
+	{\
+		.page = (i_page),\
+		.usage_blockes = (i_usage_blockes),\
+	}
+
+#define USAGE_PAGE_BLOCK_NULL {}
+
+/* simple driver internal flags */
+#define HIDINPUT_SIMPLE_SETUP_USAGE (0x1) /* the reverse is to call clear_usage */
+
+static void inline hidinput_simple_driver_setup_usage(struct hid_device *hid)
+{
+	if (hid && hid->simple) {
+		hid->simple->flags |= HIDINPUT_SIMPLE_SETUP_USAGE;
+		hidinput_simple_driver_configure_usage(hid);
+	}
+}
+
+static void inline hidinput_simple_driver_clear_usage(struct hid_device *hid)
+{
+	if (hid && hid->simple) {
+		hid->simple->flags &= (~HIDINPUT_SIMPLE_SETUP_USAGE);
+		hidinput_simple_driver_configure_usage(hid);
+	}
+}
+
+/***** The private section end.  *****/
+#endif /* __KERNEL__ */
+#endif /* __HID_SIMPLE_H */


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