hid-core.c 51.2 KB
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/*
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 *  HID support for Linux
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 *
 *  Copyright (c) 1999 Andreas Gal
 *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
 *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
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 *  Copyright (c) 2006-2007 Jiri Kosina
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 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <asm/unaligned.h>
#include <asm/byteorder.h>
#include <linux/input.h>
#include <linux/wait.h>
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#include <linux/vmalloc.h>
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#include <linux/sched.h>
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#include <linux/hid.h>
#include <linux/hiddev.h>
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#include <linux/hid-debug.h>
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#include <linux/hidraw.h>
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#include "hid-ids.h"

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/*
 * Version Information
 */

#define DRIVER_VERSION "v2.6"
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#define DRIVER_AUTHOR "Andreas Gal, Vojtech Pavlik, Jiri Kosina"
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#define DRIVER_DESC "HID core driver"
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#define DRIVER_LICENSE "GPL"

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#ifdef CONFIG_HID_DEBUG
int hid_debug = 0;
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module_param_named(debug, hid_debug, int, 0600);
MODULE_PARM_DESC(debug, "HID debugging (0=off, 1=probing info, 2=continuous data dumping)");
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EXPORT_SYMBOL_GPL(hid_debug);
#endif

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/*
 * Register a new report for a device.
 */

static struct hid_report *hid_register_report(struct hid_device *device, unsigned type, unsigned id)
{
	struct hid_report_enum *report_enum = device->report_enum + type;
	struct hid_report *report;

	if (report_enum->report_id_hash[id])
		return report_enum->report_id_hash[id];

	if (!(report = kzalloc(sizeof(struct hid_report), GFP_KERNEL)))
		return NULL;

	if (id != 0)
		report_enum->numbered = 1;

	report->id = id;
	report->type = type;
	report->size = 0;
	report->device = device;
	report_enum->report_id_hash[id] = report;

	list_add_tail(&report->list, &report_enum->report_list);

	return report;
}

/*
 * Register a new field for this report.
 */

static struct hid_field *hid_register_field(struct hid_report *report, unsigned usages, unsigned values)
{
	struct hid_field *field;

	if (report->maxfield == HID_MAX_FIELDS) {
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		dbg_hid("too many fields in report\n");
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		return NULL;
	}

	if (!(field = kzalloc(sizeof(struct hid_field) + usages * sizeof(struct hid_usage)
		+ values * sizeof(unsigned), GFP_KERNEL))) return NULL;

	field->index = report->maxfield++;
	report->field[field->index] = field;
	field->usage = (struct hid_usage *)(field + 1);
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	field->value = (s32 *)(field->usage + usages);
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	field->report = report;

	return field;
}

/*
 * Open a collection. The type/usage is pushed on the stack.
 */

static int open_collection(struct hid_parser *parser, unsigned type)
{
	struct hid_collection *collection;
	unsigned usage;

	usage = parser->local.usage[0];

	if (parser->collection_stack_ptr == HID_COLLECTION_STACK_SIZE) {
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		dbg_hid("collection stack overflow\n");
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		return -1;
	}

	if (parser->device->maxcollection == parser->device->collection_size) {
		collection = kmalloc(sizeof(struct hid_collection) *
				parser->device->collection_size * 2, GFP_KERNEL);
		if (collection == NULL) {
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			dbg_hid("failed to reallocate collection array\n");
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			return -1;
		}
		memcpy(collection, parser->device->collection,
			sizeof(struct hid_collection) *
			parser->device->collection_size);
		memset(collection + parser->device->collection_size, 0,
			sizeof(struct hid_collection) *
			parser->device->collection_size);
		kfree(parser->device->collection);
		parser->device->collection = collection;
		parser->device->collection_size *= 2;
	}

	parser->collection_stack[parser->collection_stack_ptr++] =
		parser->device->maxcollection;

	collection = parser->device->collection +
		parser->device->maxcollection++;
	collection->type = type;
	collection->usage = usage;
	collection->level = parser->collection_stack_ptr - 1;

	if (type == HID_COLLECTION_APPLICATION)
		parser->device->maxapplication++;

	return 0;
}

/*
 * Close a collection.
 */

static int close_collection(struct hid_parser *parser)
{
	if (!parser->collection_stack_ptr) {
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		dbg_hid("collection stack underflow\n");
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		return -1;
	}
	parser->collection_stack_ptr--;
	return 0;
}

/*
 * Climb up the stack, search for the specified collection type
 * and return the usage.
 */

static unsigned hid_lookup_collection(struct hid_parser *parser, unsigned type)
{
	int n;
	for (n = parser->collection_stack_ptr - 1; n >= 0; n--)
		if (parser->device->collection[parser->collection_stack[n]].type == type)
			return parser->device->collection[parser->collection_stack[n]].usage;
	return 0; /* we know nothing about this usage type */
}

/*
 * Add a usage to the temporary parser table.
 */

static int hid_add_usage(struct hid_parser *parser, unsigned usage)
{
	if (parser->local.usage_index >= HID_MAX_USAGES) {
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		dbg_hid("usage index exceeded\n");
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		return -1;
	}
	parser->local.usage[parser->local.usage_index] = usage;
	parser->local.collection_index[parser->local.usage_index] =
		parser->collection_stack_ptr ?
		parser->collection_stack[parser->collection_stack_ptr - 1] : 0;
	parser->local.usage_index++;
	return 0;
}

/*
 * Register a new field for this report.
 */

static int hid_add_field(struct hid_parser *parser, unsigned report_type, unsigned flags)
{
	struct hid_report *report;
	struct hid_field *field;
	int usages;
	unsigned offset;
	int i;

	if (!(report = hid_register_report(parser->device, report_type, parser->global.report_id))) {
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		dbg_hid("hid_register_report failed\n");
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		return -1;
	}

	if (parser->global.logical_maximum < parser->global.logical_minimum) {
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		dbg_hid("logical range invalid %d %d\n", parser->global.logical_minimum, parser->global.logical_maximum);
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		return -1;
	}

	offset = report->size;
	report->size += parser->global.report_size * parser->global.report_count;

	if (!parser->local.usage_index) /* Ignore padding fields */
		return 0;

	usages = max_t(int, parser->local.usage_index, parser->global.report_count);

	if ((field = hid_register_field(report, usages, parser->global.report_count)) == NULL)
		return 0;

	field->physical = hid_lookup_collection(parser, HID_COLLECTION_PHYSICAL);
	field->logical = hid_lookup_collection(parser, HID_COLLECTION_LOGICAL);
	field->application = hid_lookup_collection(parser, HID_COLLECTION_APPLICATION);

	for (i = 0; i < usages; i++) {
		int j = i;
		/* Duplicate the last usage we parsed if we have excess values */
		if (i >= parser->local.usage_index)
			j = parser->local.usage_index - 1;
		field->usage[i].hid = parser->local.usage[j];
		field->usage[i].collection_index =
			parser->local.collection_index[j];
	}

	field->maxusage = usages;
	field->flags = flags;
	field->report_offset = offset;
	field->report_type = report_type;
	field->report_size = parser->global.report_size;
	field->report_count = parser->global.report_count;
	field->logical_minimum = parser->global.logical_minimum;
	field->logical_maximum = parser->global.logical_maximum;
	field->physical_minimum = parser->global.physical_minimum;
	field->physical_maximum = parser->global.physical_maximum;
	field->unit_exponent = parser->global.unit_exponent;
	field->unit = parser->global.unit;

	return 0;
}

/*
 * Read data value from item.
 */

static u32 item_udata(struct hid_item *item)
{
	switch (item->size) {
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	case 1: return item->data.u8;
	case 2: return item->data.u16;
	case 4: return item->data.u32;
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	}
	return 0;
}

static s32 item_sdata(struct hid_item *item)
{
	switch (item->size) {
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	case 1: return item->data.s8;
	case 2: return item->data.s16;
	case 4: return item->data.s32;
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	}
	return 0;
}

/*
 * Process a global item.
 */

static int hid_parser_global(struct hid_parser *parser, struct hid_item *item)
{
	switch (item->tag) {
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	case HID_GLOBAL_ITEM_TAG_PUSH:
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		if (parser->global_stack_ptr == HID_GLOBAL_STACK_SIZE) {
			dbg_hid("global enviroment stack overflow\n");
			return -1;
		}
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		memcpy(parser->global_stack + parser->global_stack_ptr++,
			&parser->global, sizeof(struct hid_global));
		return 0;
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	case HID_GLOBAL_ITEM_TAG_POP:
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		if (!parser->global_stack_ptr) {
			dbg_hid("global enviroment stack underflow\n");
			return -1;
		}
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		memcpy(&parser->global, parser->global_stack +
			--parser->global_stack_ptr, sizeof(struct hid_global));
		return 0;
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	case HID_GLOBAL_ITEM_TAG_USAGE_PAGE:
		parser->global.usage_page = item_udata(item);
		return 0;
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	case HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM:
		parser->global.logical_minimum = item_sdata(item);
		return 0;
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	case HID_GLOBAL_ITEM_TAG_LOGICAL_MAXIMUM:
		if (parser->global.logical_minimum < 0)
			parser->global.logical_maximum = item_sdata(item);
		else
			parser->global.logical_maximum = item_udata(item);
		return 0;
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	case HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM:
		parser->global.physical_minimum = item_sdata(item);
		return 0;
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	case HID_GLOBAL_ITEM_TAG_PHYSICAL_MAXIMUM:
		if (parser->global.physical_minimum < 0)
			parser->global.physical_maximum = item_sdata(item);
		else
			parser->global.physical_maximum = item_udata(item);
		return 0;
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	case HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT:
		parser->global.unit_exponent = item_sdata(item);
		return 0;
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	case HID_GLOBAL_ITEM_TAG_UNIT:
		parser->global.unit = item_udata(item);
		return 0;
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	case HID_GLOBAL_ITEM_TAG_REPORT_SIZE:
		parser->global.report_size = item_udata(item);
		if (parser->global.report_size > 32) {
			dbg_hid("invalid report_size %d\n",
					parser->global.report_size);
			return -1;
		}
		return 0;
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	case HID_GLOBAL_ITEM_TAG_REPORT_COUNT:
		parser->global.report_count = item_udata(item);
		if (parser->global.report_count > HID_MAX_USAGES) {
			dbg_hid("invalid report_count %d\n",
					parser->global.report_count);
			return -1;
		}
		return 0;
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	case HID_GLOBAL_ITEM_TAG_REPORT_ID:
		parser->global.report_id = item_udata(item);
		if (parser->global.report_id == 0) {
			dbg_hid("report_id 0 is invalid\n");
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			return -1;
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		}
		return 0;

	default:
		dbg_hid("unknown global tag 0x%x\n", item->tag);
		return -1;
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	}
}

/*
 * Process a local item.
 */

static int hid_parser_local(struct hid_parser *parser, struct hid_item *item)
{
	__u32 data;
	unsigned n;

	if (item->size == 0) {
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		dbg_hid("item data expected for local item\n");
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		return -1;
	}

	data = item_udata(item);

	switch (item->tag) {
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	case HID_LOCAL_ITEM_TAG_DELIMITER:

		if (data) {
			/*
			 * We treat items before the first delimiter
			 * as global to all usage sets (branch 0).
			 * In the moment we process only these global
			 * items and the first delimiter set.
			 */
			if (parser->local.delimiter_depth != 0) {
				dbg_hid("nested delimiters\n");
				return -1;
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			}
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			parser->local.delimiter_depth++;
			parser->local.delimiter_branch++;
		} else {
			if (parser->local.delimiter_depth < 1) {
				dbg_hid("bogus close delimiter\n");
				return -1;
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			}
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			parser->local.delimiter_depth--;
		}
		return 1;
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	case HID_LOCAL_ITEM_TAG_USAGE:
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		if (parser->local.delimiter_branch > 1) {
			dbg_hid("alternative usage ignored\n");
			return 0;
		}
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		if (item->size <= 2)
			data = (parser->global.usage_page << 16) + data;
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		return hid_add_usage(parser, data);
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	case HID_LOCAL_ITEM_TAG_USAGE_MINIMUM:
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		if (parser->local.delimiter_branch > 1) {
			dbg_hid("alternative usage ignored\n");
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			return 0;
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		}
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		if (item->size <= 2)
			data = (parser->global.usage_page << 16) + data;
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		parser->local.usage_minimum = data;
		return 0;
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	case HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM:
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		if (parser->local.delimiter_branch > 1) {
			dbg_hid("alternative usage ignored\n");
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			return 0;
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		}
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		if (item->size <= 2)
			data = (parser->global.usage_page << 16) + data;
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		for (n = parser->local.usage_minimum; n <= data; n++)
			if (hid_add_usage(parser, n)) {
				dbg_hid("hid_add_usage failed\n");
				return -1;
			}
		return 0;

	default:

		dbg_hid("unknown local item tag 0x%x\n", item->tag);
		return 0;
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	}
	return 0;
}

/*
 * Process a main item.
 */

static int hid_parser_main(struct hid_parser *parser, struct hid_item *item)
{
	__u32 data;
	int ret;

	data = item_udata(item);

	switch (item->tag) {
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	case HID_MAIN_ITEM_TAG_BEGIN_COLLECTION:
		ret = open_collection(parser, data & 0xff);
		break;
	case HID_MAIN_ITEM_TAG_END_COLLECTION:
		ret = close_collection(parser);
		break;
	case HID_MAIN_ITEM_TAG_INPUT:
		ret = hid_add_field(parser, HID_INPUT_REPORT, data);
		break;
	case HID_MAIN_ITEM_TAG_OUTPUT:
		ret = hid_add_field(parser, HID_OUTPUT_REPORT, data);
		break;
	case HID_MAIN_ITEM_TAG_FEATURE:
		ret = hid_add_field(parser, HID_FEATURE_REPORT, data);
		break;
	default:
		dbg_hid("unknown main item tag 0x%x\n", item->tag);
		ret = 0;
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	}

	memset(&parser->local, 0, sizeof(parser->local));	/* Reset the local parser environment */

	return ret;
}

/*
 * Process a reserved item.
 */

static int hid_parser_reserved(struct hid_parser *parser, struct hid_item *item)
{
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	dbg_hid("reserved item type, tag 0x%x\n", item->tag);
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	return 0;
}

/*
 * Free a report and all registered fields. The field->usage and
 * field->value table's are allocated behind the field, so we need
 * only to free(field) itself.
 */

static void hid_free_report(struct hid_report *report)
{
	unsigned n;

	for (n = 0; n < report->maxfield; n++)
		kfree(report->field[n]);
	kfree(report);
}

/*
 * Free a device structure, all reports, and all fields.
 */

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static void hid_device_release(struct device *dev)
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{
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	struct hid_device *device = container_of(dev, struct hid_device, dev);
	unsigned i, j;
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	for (i = 0; i < HID_REPORT_TYPES; i++) {
		struct hid_report_enum *report_enum = device->report_enum + i;

		for (j = 0; j < 256; j++) {
			struct hid_report *report = report_enum->report_id_hash[j];
			if (report)
				hid_free_report(report);
		}
	}

	kfree(device->rdesc);
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	kfree(device->collection);
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	kfree(device);
}

/*
 * Fetch a report description item from the data stream. We support long
 * items, though they are not used yet.
 */

static u8 *fetch_item(__u8 *start, __u8 *end, struct hid_item *item)
{
	u8 b;

	if ((end - start) <= 0)
		return NULL;

	b = *start++;

	item->type = (b >> 2) & 3;
	item->tag  = (b >> 4) & 15;

	if (item->tag == HID_ITEM_TAG_LONG) {

		item->format = HID_ITEM_FORMAT_LONG;

		if ((end - start) < 2)
			return NULL;

		item->size = *start++;
		item->tag  = *start++;

		if ((end - start) < item->size)
			return NULL;

		item->data.longdata = start;
		start += item->size;
		return start;
	}

	item->format = HID_ITEM_FORMAT_SHORT;
	item->size = b & 3;

	switch (item->size) {
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	case 0:
		return start;
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	case 1:
		if ((end - start) < 1)
			return NULL;
		item->data.u8 = *start++;
		return start;

	case 2:
		if ((end - start) < 2)
			return NULL;
		item->data.u16 = get_unaligned_le16(start);
		start = (__u8 *)((__le16 *)start + 1);
		return start;

	case 3:
		item->size++;
		if ((end - start) < 4)
			return NULL;
		item->data.u32 = get_unaligned_le32(start);
		start = (__u8 *)((__le32 *)start + 1);
		return start;
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	}

	return NULL;
}

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/**
 * hid_parse_report - parse device report
 *
 * @device: hid device
 * @start: report start
 * @size: report size
 *
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 * Parse a report description into a hid_device structure. Reports are
 * enumerated, fields are attached to these reports.
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 * 0 returned on success, otherwise nonzero error value.
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 */
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int hid_parse_report(struct hid_device *device, __u8 *start,
		unsigned size)
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{
	struct hid_parser *parser;
	struct hid_item item;
	__u8 *end;
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	int ret;
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	static int (*dispatch_type[])(struct hid_parser *parser,
				      struct hid_item *item) = {
		hid_parser_main,
		hid_parser_global,
		hid_parser_local,
		hid_parser_reserved
	};

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	if (device->driver->report_fixup)
		device->driver->report_fixup(device, start, size);

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	device->rdesc = kmalloc(size, GFP_KERNEL);
	if (device->rdesc == NULL)
		return -ENOMEM;
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	memcpy(device->rdesc, start, size);
	device->rsize = size;

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	parser = vmalloc(sizeof(struct hid_parser));
	if (!parser) {
		ret = -ENOMEM;
		goto err;
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	}
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	memset(parser, 0, sizeof(struct hid_parser));
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	parser->device = device;

	end = start + size;
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	ret = -EINVAL;
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	while ((start = fetch_item(start, end, &item)) != NULL) {

		if (item.format != HID_ITEM_FORMAT_SHORT) {
678
			dbg_hid("unexpected long global item\n");
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			goto err;
680 681 682
		}

		if (dispatch_type[item.type](parser, &item)) {
683
			dbg_hid("item %u %u %u %u parsing failed\n",
684
				item.format, (unsigned)item.size, (unsigned)item.type, (unsigned)item.tag);
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			goto err;
686 687 688 689
		}

		if (start == end) {
			if (parser->collection_stack_ptr) {
690
				dbg_hid("unbalanced collection at end of report description\n");
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				goto err;
692 693
			}
			if (parser->local.delimiter_depth) {
694
				dbg_hid("unbalanced delimiter at end of report description\n");
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				goto err;
696
			}
697
			vfree(parser);
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698
			return 0;
699 700 701
		}
	}

702
	dbg_hid("item fetching failed at offset %d\n", (int)(end - start));
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err:
704
	vfree(parser);
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705
	return ret;
706
}
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EXPORT_SYMBOL_GPL(hid_parse_report);
708 709 710 711 712 713 714 715 716 717

/*
 * Convert a signed n-bit integer to signed 32-bit integer. Common
 * cases are done through the compiler, the screwed things has to be
 * done by hand.
 */

static s32 snto32(__u32 value, unsigned n)
{
	switch (n) {
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	case 8:  return ((__s8)value);
	case 16: return ((__s16)value);
	case 32: return ((__s32)value);
721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752
	}
	return value & (1 << (n - 1)) ? value | (-1 << n) : value;
}

/*
 * Convert a signed 32-bit integer to a signed n-bit integer.
 */

static u32 s32ton(__s32 value, unsigned n)
{
	s32 a = value >> (n - 1);
	if (a && a != -1)
		return value < 0 ? 1 << (n - 1) : (1 << (n - 1)) - 1;
	return value & ((1 << n) - 1);
}

/*
 * Extract/implement a data field from/to a little endian report (bit array).
 *
 * Code sort-of follows HID spec:
 *     http://www.usb.org/developers/devclass_docs/HID1_11.pdf
 *
 * While the USB HID spec allows unlimited length bit fields in "report
 * descriptors", most devices never use more than 16 bits.
 * One model of UPS is claimed to report "LINEV" as a 32-bit field.
 * Search linux-kernel and linux-usb-devel archives for "hid-core extract".
 */

static __inline__ __u32 extract(__u8 *report, unsigned offset, unsigned n)
{
	u64 x;

753 754 755
	if (n > 32)
		printk(KERN_WARNING "HID: extract() called with n (%d) > 32! (%s)\n",
				n, current->comm);
756 757

	report += offset >> 3;  /* adjust byte index */
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758
	offset &= 7;            /* now only need bit offset into one byte */
759
	x = get_unaligned_le64(report);
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760
	x = (x >> offset) & ((1ULL << n) - 1);  /* extract bit field */
761 762 763 764 765 766 767 768 769 770 771 772 773
	return (u32) x;
}

/*
 * "implement" : set bits in a little endian bit stream.
 * Same concepts as "extract" (see comments above).
 * The data mangled in the bit stream remains in little endian
 * order the whole time. It make more sense to talk about
 * endianness of register values by considering a register
 * a "cached" copy of the little endiad bit stream.
 */
static __inline__ void implement(__u8 *report, unsigned offset, unsigned n, __u32 value)
{
774
	u64 x;
775 776
	u64 m = (1ULL << n) - 1;

777 778 779
	if (n > 32)
		printk(KERN_WARNING "HID: implement() called with n (%d) > 32! (%s)\n",
				n, current->comm);
780

781 782 783
	if (value > m)
		printk(KERN_WARNING "HID: implement() called with too large value %d! (%s)\n",
				value, current->comm);
784 785 786 787 788 789
	WARN_ON(value > m);
	value &= m;

	report += offset >> 3;
	offset &= 7;

790 791 792 793
	x = get_unaligned_le64(report);
	x &= ~(m << offset);
	x |= ((u64)value) << offset;
	put_unaligned_le64(x, report);
794 795 796 797 798 799 800 801 802 803 804 805 806 807 808
}

/*
 * Search an array for a value.
 */

static __inline__ int search(__s32 *array, __s32 value, unsigned n)
{
	while (n--) {
		if (*array++ == value)
			return 0;
	}
	return -1;
}

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/**
 * hid_match_report - check if driver's raw_event should be called
 *
 * @hid: hid device
 * @report_type: type to match against
 *
 * compare hid->driver->report_table->report_type to report->type
 */
static int hid_match_report(struct hid_device *hid, struct hid_report *report)
818
{
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	const struct hid_report_id *id = hid->driver->report_table;

	if (!id) /* NULL means all */
		return 1;

	for (; id->report_type != HID_TERMINATOR; id++)
		if (id->report_type == HID_ANY_ID ||
				id->report_type == report->type)
			return 1;
	return 0;
}

/**
 * hid_match_usage - check if driver's event should be called
 *
 * @hid: hid device
 * @usage: usage to match against
 *
 * compare hid->driver->usage_table->usage_{type,code} to
 * usage->usage_{type,code}
 */
static int hid_match_usage(struct hid_device *hid, struct hid_usage *usage)
{
	const struct hid_usage_id *id = hid->driver->usage_table;

	if (!id) /* NULL means all */
		return 1;

	for (; id->usage_type != HID_ANY_ID - 1; id++)
		if ((id->usage_hid == HID_ANY_ID ||
				id->usage_hid == usage->hid) &&
				(id->usage_type == HID_ANY_ID ||
				id->usage_type == usage->type) &&
				(id->usage_code == HID_ANY_ID ||
				 id->usage_code == usage->code))
			return 1;
	return 0;
}

static void hid_process_event(struct hid_device *hid, struct hid_field *field,
		struct hid_usage *usage, __s32 value, int interrupt)
{
	struct hid_driver *hdrv = hid->driver;
	int ret;

864
	hid_dump_input(usage, value);
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	if (hdrv && hdrv->event && hid_match_usage(hid, usage)) {
		ret = hdrv->event(hid, field, usage, value);
		if (ret != 0) {
			if (ret < 0)
				dbg_hid("%s's event failed with %d\n",
						hdrv->name, ret);
			return;
		}
	}

876 877
	if (hid->claimed & HID_CLAIMED_INPUT)
		hidinput_hid_event(hid, field, usage, value);
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	if (hid->claimed & HID_CLAIMED_HIDDEV && interrupt && hid->hiddev_hid_event)
		hid->hiddev_hid_event(hid, field, usage, value);
880 881 882 883 884 885 886 887
}

/*
 * Analyse a received field, and fetch the data from it. The field
 * content is stored for next report processing (we do differential
 * reporting to the layer).
 */

888 889
static void hid_input_field(struct hid_device *hid, struct hid_field *field,
			    __u8 *data, int interrupt)
890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944
{
	unsigned n;
	unsigned count = field->report_count;
	unsigned offset = field->report_offset;
	unsigned size = field->report_size;
	__s32 min = field->logical_minimum;
	__s32 max = field->logical_maximum;
	__s32 *value;

	if (!(value = kmalloc(sizeof(__s32) * count, GFP_ATOMIC)))
		return;

	for (n = 0; n < count; n++) {

			value[n] = min < 0 ? snto32(extract(data, offset + n * size, size), size) :
						    extract(data, offset + n * size, size);

			if (!(field->flags & HID_MAIN_ITEM_VARIABLE) /* Ignore report if ErrorRollOver */
			    && value[n] >= min && value[n] <= max
			    && field->usage[value[n] - min].hid == HID_UP_KEYBOARD + 1)
				goto exit;
	}

	for (n = 0; n < count; n++) {

		if (HID_MAIN_ITEM_VARIABLE & field->flags) {
			hid_process_event(hid, field, &field->usage[n], value[n], interrupt);
			continue;
		}

		if (field->value[n] >= min && field->value[n] <= max
			&& 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);

		if (value[n] >= min && value[n] <= max
			&& field->usage[value[n] - min].hid
			&& search(field->value, value[n], count))
				hid_process_event(hid, field, &field->usage[value[n] - min], 1, interrupt);
	}

	memcpy(field->value, value, count * sizeof(__s32));
exit:
	kfree(value);
}

/*
 * Output the field into the report.
 */

static void hid_output_field(struct hid_field *field, __u8 *data)
{
	unsigned count = field->report_count;
	unsigned offset = field->report_offset;
	unsigned size = field->report_size;
945
	unsigned bitsused = offset + count * size;
946 947
	unsigned n;

948 949 950 951
	/* make sure the unused bits in the last byte are zeros */
	if (count > 0 && size > 0 && (bitsused % 8) != 0)
		data[(bitsused-1)/8] &= (1 << (bitsused % 8)) - 1;

952 953 954 955 956 957 958 959 960 961 962 963
	for (n = 0; n < count; n++) {
		if (field->logical_minimum < 0)	/* signed values */
			implement(data, offset + n * size, size, s32ton(field->value[n], size));
		else				/* unsigned values */
			implement(data, offset + n * size, size, field->value[n]);
	}
}

/*
 * Create a report.
 */

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void hid_output_report(struct hid_report *report, __u8 *data)
965 966 967 968 969 970 971 972 973
{
	unsigned n;

	if (report->id > 0)
		*data++ = report->id;

	for (n = 0; n < report->maxfield; n++)
		hid_output_field(report->field[n], data);
}
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EXPORT_SYMBOL_GPL(hid_output_report);
975 976 977 978 979 980 981 982 983 984 985 986 987 988

/*
 * Set a field value. The report this field belongs to has to be
 * created and transferred to the device, to set this value in the
 * device.
 */

int hid_set_field(struct hid_field *field, unsigned offset, __s32 value)
{
	unsigned size = field->report_size;

	hid_dump_input(field->usage + offset, value);

	if (offset >= field->report_count) {
989
		dbg_hid("offset (%d) exceeds report_count (%d)\n", offset, field->report_count);
990 991 992 993 994
		hid_dump_field(field, 8);
		return -1;
	}
	if (field->logical_minimum < 0) {
		if (value != snto32(s32ton(value, size), size)) {
995
			dbg_hid("value %d is out of range\n", value);
996 997 998 999 1000 1001
			return -1;
		}
	}
	field->value[offset] = value;
	return 0;
}
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1002
EXPORT_SYMBOL_GPL(hid_set_field);
1003

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static struct hid_report *hid_get_report(struct hid_report_enum *report_enum,
		const u8 *data)
1006 1007
{
	struct hid_report *report;
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1008
	unsigned int n = 0;	/* Normally report number is 0 */
1009

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	/* Device uses numbered reports, data[0] is report number */
	if (report_enum->numbered)
		n = *data;
1013

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1014 1015 1016
	report = report_enum->report_id_hash[n];
	if (report == NULL)
		dbg_hid("undefined report_id %u received\n", n);
1017

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1018 1019
	return report;
}
1020

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void hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
		int interrupt)
{
	struct hid_report_enum *report_enum = hid->report_enum + type;
	struct hid_report *report;
	unsigned int a;
	int rsize, csize = size;
	u8 *cdata = data;
1029

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1030 1031 1032
	report = hid_get_report(report_enum, data);
	if (!report)
		return;
1033

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1034 1035 1036
	if (report_enum->numbered) {
		cdata++;
		csize--;
1037 1038 1039 1040
	}

	rsize = ((report->size - 1) >> 3) + 1;

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1041 1042 1043 1044
	if (csize < rsize) {
		dbg_hid("report %d is too short, (%d < %d)\n", report->id,
				csize, rsize);
		memset(cdata + csize, 0, rsize - csize);
1045 1046 1047 1048
	}

	if ((hid->claimed & HID_CLAIMED_HIDDEV) && hid->hiddev_report_event)
		hid->hiddev_report_event(hid, report);
1049 1050 1051 1052 1053 1054 1055
	if (hid->claimed & HID_CLAIMED_HIDRAW) {
		/* numbered reports need to be passed with the report num */
		if (report_enum->numbered)
			hidraw_report_event(hid, data - 1, size + 1);
		else
			hidraw_report_event(hid, data, size);
	}
1056

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1057 1058
	for (a = 0; a < report->maxfield; a++)
		hid_input_field(hid, report->field[a], cdata, interrupt);
1059 1060 1061

	if (hid->claimed & HID_CLAIMED_INPUT)
		hidinput_report_event(hid, report);
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}
EXPORT_SYMBOL_GPL(hid_report_raw_event);

/**
 * hid_input_report - report data from lower layer (usb, bt...)
 *
 * @hid: hid device
 * @type: HID report type (HID_*_REPORT)
 * @data: report contents
 * @size: size of data parameter
 * @interrupt: called from atomic?
 *
 * This is data entry for lower layers.
 */
int hid_input_report(struct hid_device *hid, int type, u8 *data, int size, int interrupt)
{
	struct hid_report_enum *report_enum = hid->report_enum + type;
	struct hid_driver *hdrv = hid->driver;
	struct hid_report *report;
	unsigned int i;
	int ret;

	if (!hid || !hid->driver)
		return -ENODEV;

	if (!size) {
		dbg_hid("empty report\n");
		return -1;
	}

	dbg_hid("report (size %u) (%snumbered)\n", size, report_enum->numbered ? "" : "un");

	report = hid_get_report(report_enum, data);
	if (!report)
		return -1;

	/* dump the report */
	dbg_hid("report %d (size %u) = ", report->id, size);
	for (i = 0; i < size; i++)
		dbg_hid_line(" %02x", data[i]);
	dbg_hid_line("\n");

	if (hdrv && hdrv->raw_event && hid_match_report(hid, report)) {
		ret = hdrv->raw_event(hid, report, data, size);
		if (ret != 0)
			return ret < 0 ? ret : 0;
	}

	hid_report_raw_event(hid, type, data, size, interrupt);
1111 1112 1113 1114 1115

	return 0;
}
EXPORT_SYMBOL_GPL(hid_input_report);

1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134
static bool hid_match_one_id(struct hid_device *hdev,
		const struct hid_device_id *id)
{
	return id->bus == hdev->bus &&
		(id->vendor == HID_ANY_ID || id->vendor == hdev->vendor) &&
		(id->product == HID_ANY_ID || id->product == hdev->product);
}

static const struct hid_device_id *hid_match_id(struct hid_device *hdev,
		const struct hid_device_id *id)
{
	for (; id->bus; id++)
		if (hid_match_one_id(hdev, id))
			return id;

	return NULL;
}

static const struct hid_device_id hid_hiddev_list[] = {
1135 1136
	{ HID_USB_DEVICE(USB_VENDOR_ID_MGE, USB_DEVICE_ID_MGE_UPS) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_MGE, USB_DEVICE_ID_MGE_UPS1) },
1137 1138 1139 1140 1141 1142 1143 1144
	{ }
};

static bool hid_hiddev(struct hid_device *hdev)
{
	return !!hid_match_id(hdev, hid_hiddev_list);
}

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1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157
int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
{
	static const char *types[] = { "Device", "Pointer", "Mouse", "Device",
		"Joystick", "Gamepad", "Keyboard", "Keypad",
		"Multi-Axis Controller"
	};
	const char *type, *bus;
	char buf[64];
	unsigned int i;
	int len;

	if (hdev->bus != BUS_USB)
		connect_mask &= ~HID_CONNECT_HIDDEV;
1158 1159
	if (hid_hiddev(hdev))
		connect_mask |= HID_CONNECT_HIDDEV_FORCE;
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1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220

	if ((connect_mask & HID_CONNECT_HIDINPUT) && !hidinput_connect(hdev,
				connect_mask & HID_CONNECT_HIDINPUT_FORCE))
		hdev->claimed |= HID_CLAIMED_INPUT;
	if ((connect_mask & HID_CONNECT_HIDDEV) && hdev->hiddev_connect &&
			!hdev->hiddev_connect(hdev,
				connect_mask & HID_CONNECT_HIDDEV_FORCE))
		hdev->claimed |= HID_CLAIMED_HIDDEV;
	if ((connect_mask & HID_CONNECT_HIDRAW) && !hidraw_connect(hdev))
		hdev->claimed |= HID_CLAIMED_HIDRAW;

	if (!hdev->claimed) {
		dev_err(&hdev->dev, "claimed by neither input, hiddev nor "
				"hidraw\n");
		return -ENODEV;
	}

	if ((hdev->claimed & HID_CLAIMED_INPUT) &&
			(connect_mask & HID_CONNECT_FF) && hdev->ff_init)
		hdev->ff_init(hdev);

	len = 0;
	if (hdev->claimed & HID_CLAIMED_INPUT)
		len += sprintf(buf + len, "input");
	if (hdev->claimed & HID_CLAIMED_HIDDEV)
		len += sprintf(buf + len, "%shiddev%d", len ? "," : "",
				hdev->minor);
	if (hdev->claimed & HID_CLAIMED_HIDRAW)
		len += sprintf(buf + len, "%shidraw%d", len ? "," : "",
				((struct hidraw *)hdev->hidraw)->minor);

	type = "Device";
	for (i = 0; i < hdev->maxcollection; i++) {
		struct hid_collection *col = &hdev->collection[i];
		if (col->type == HID_COLLECTION_APPLICATION &&
		   (col->usage & HID_USAGE_PAGE) == HID_UP_GENDESK &&
		   (col->usage & 0xffff) < ARRAY_SIZE(types)) {
			type = types[col->usage & 0xffff];
			break;
		}
	}

	switch (hdev->bus) {
	case BUS_USB:
		bus = "USB";
		break;
	case BUS_BLUETOOTH:
		bus = "BLUETOOTH";
		break;
	default:
		bus = "<UNKNOWN>";
	}

	dev_info(&hdev->dev, "%s: %s HID v%x.%02x %s [%s] on %s\n",
			buf, bus, hdev->version >> 8, hdev->version & 0xff,
			type, hdev->name, hdev->phys);

	return 0;
}
EXPORT_SYMBOL_GPL(hid_connect);

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static const struct hid_device_id hid_blacklist[] = {
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1222 1223
	{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D) },
1224
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_ATV_IRCONTROL) },
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1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_IRCONTROL4) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_MIGHTYMOUSE) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_FOUNTAIN_ANSI) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_FOUNTAIN_ISO) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_GEYSER_ANSI) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_GEYSER_ISO) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_GEYSER_JIS) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_GEYSER3_ANSI) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_GEYSER3_ISO) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_GEYSER3_JIS) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_GEYSER4_ANSI) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_GEYSER4_ISO) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_GEYSER4_JIS) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_ALU_ANSI) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_ALU_ISO) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_ALU_JIS) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_GEYSER4_HF_ANSI) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_GEYSER4_HF_ISO) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_GEYSER4_HF_JIS) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_ALU_WIRELESS_ANSI) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_ALU_WIRELESS_ISO) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_ALU_WIRELESS_JIS) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRING_ANSI) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRING_ISO) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRING_JIS) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRING2_ANSI) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRING2_ISO) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_WELLSPRING2_JIS) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_FOUNTAIN_TP_ONLY) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_GEYSER1_TP_ONLY) },
1255
	{ HID_USB_DEVICE(USB_VENDOR_ID_AVERMEDIA, USB_DEVICE_ID_AVER_FM_MR800) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_BELKIN, USB_DEVICE_ID_FLIP_KVM) },
1257
	{ HID_USB_DEVICE(USB_VENDOR_ID_BRIGHT, USB_DEVICE_ID_BRIGHT_ABNT2) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_TACTICAL_PAD) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_DELL, USB_DEVICE_ID_DELL_W7658) },
1264
	{ HID_USB_DEVICE(USB_VENDOR_ID_DELL, USB_DEVICE_ID_DELL_SK8115) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_EZKEY, USB_DEVICE_ID_BTC_8193) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_GYRATION, USB_DEVICE_ID_GYRATION_REMOTE) },
1267
	{ HID_USB_DEVICE(USB_VENDOR_ID_GYRATION, USB_DEVICE_ID_GYRATION_REMOTE_2) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_LABTEC, USB_DEVICE_ID_LABTEC_WIRELESS_KEYBOARD) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_MX3000_RECEIVER) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_S510_RECEIVER) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_S510_RECEIVER_2) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_RECEIVER) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_DINOVO_DESKTOP) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_DINOVO_EDGE) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_DINOVO_MINI) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_KBD) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_ELITE_KBD) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_CORDLESS_DESKTOP_LX500) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_EXTREME_3D) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_WHEEL) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_RUMBLEPAD) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_RUMBLEPAD2_2) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_WINGMAN_F3D) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_FORCE3D_PRO) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_MOMO_WHEEL) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_LOGITECH_RUMBLEPAD2) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_SIDEWINDER_GV) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_NE4K) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_LK6K) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_PRESENTER_8K_USB) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_WIRELESS_OPTICAL_DESKTOP_3_0) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_MONTEREY, USB_DEVICE_ID_GENIUS_KB29E) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_PETALYNX, USB_DEVICE_ID_PETALYNX_MAXTER_REMOTE) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG, USB_DEVICE_ID_SAMSUNG_IR_REMOTE) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS3_CONTROLLER) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_SUNPLUS, USB_DEVICE_ID_SUNPLUS_WDESKTOP) },
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	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE, 0x030c) },
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	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_MICROSOFT, USB_DEVICE_ID_MS_PRESENTER_8K_BT) },
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	{ }
};

static int hid_bus_match(struct device *dev, struct device_driver *drv)
{
	struct hid_driver *hdrv = container_of(drv, struct hid_driver, driver);
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);

	if (!hid_match_id(hdev, hdrv->id_table))
		return 0;

	/* generic wants all non-blacklisted */
	if (!strncmp(hdrv->name, "generic-", 8))
		return !hid_match_id(hdev, hid_blacklist);

	return 1;
}

static int hid_device_probe(struct device *dev)
{
	struct hid_driver *hdrv = container_of(dev->driver,
			struct hid_driver, driver);
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	const struct hid_device_id *id;
	int ret = 0;

	if (!hdev->driver) {
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		id = hid_match_id(hdev, hdrv->id_table);
		if (id == NULL)
			return -ENODEV;
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		hdev->driver = hdrv;
		if (hdrv->probe) {
			ret = hdrv->probe(hdev, id);
		} else { /* default probe */
			ret = hid_parse(hdev);
			if (!ret)
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				ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
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		}
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		if (ret)
			hdev->driver = NULL;
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	}
	return ret;
}

static int hid_device_remove(struct device *dev)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct hid_driver *hdrv = hdev->driver;

	if (hdrv) {
		if (hdrv->remove)
			hdrv->remove(hdev);
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		else /* default remove */
			hid_hw_stop(hdev);
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		hdev->driver = NULL;
	}

	return 0;
}

static int hid_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);

	if (add_uevent_var(env, "HID_ID=%04X:%08X:%08X",
			hdev->bus, hdev->vendor, hdev->product))
		return -ENOMEM;

	if (add_uevent_var(env, "HID_NAME=%s", hdev->name))
		return -ENOMEM;

	if (add_uevent_var(env, "HID_PHYS=%s", hdev->phys))
		return -ENOMEM;

	if (add_uevent_var(env, "HID_UNIQ=%s", hdev->uniq))
		return -ENOMEM;

	if (add_uevent_var(env, "MODALIAS=hid:b%04Xv%08Xp%08X",
			hdev->bus, hdev->vendor, hdev->product))
		return -ENOMEM;

	return 0;
}

static struct bus_type hid_bus_type = {
	.name		= "hid",
	.match		= hid_bus_match,
	.probe		= hid_device_probe,
	.remove		= hid_device_remove,
	.uevent		= hid_uevent,
};

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static const struct hid_device_id hid_ignore_list[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_ACECAD, USB_DEVICE_ID_ACECAD_FLAIR) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ACECAD, USB_DEVICE_ID_ACECAD_302) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ADS_TECH, USB_DEVICE_ID_ADS_TECH_RADIO_SI470X) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_AIPTEK, USB_DEVICE_ID_AIPTEK_01) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_AIPTEK, USB_DEVICE_ID_AIPTEK_10) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_AIPTEK, USB_DEVICE_ID_AIPTEK_20) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_AIPTEK, USB_DEVICE_ID_AIPTEK_21) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_AIPTEK, USB_DEVICE_ID_AIPTEK_22) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_AIPTEK, USB_DEVICE_ID_AIPTEK_23) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_AIPTEK, USB_DEVICE_ID_AIPTEK_24) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_AIRCABLE, USB_DEVICE_ID_AIRCABLE1) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ALCOR, USB_DEVICE_ID_ALCOR_USBRS232) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_LCM)},
	{ HID_USB_DEVICE(USB_VENDOR_ID_BERKSHIRE, USB_DEVICE_ID_BERKSHIRE_PCWD) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_CIDC, 0x0103) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_RADIO_SI470X) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_CMEDIA, USB_DEVICE_ID_CM109) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_HIDCOM) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_ULTRAMOUSE) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_DELORME, USB_DEVICE_ID_DELORME_EARTHMATE) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_DELORME, USB_DEVICE_ID_DELORME_EM_LT20) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ESSENTIAL_REALITY, USB_DEVICE_ID_ESSENTIAL_REALITY_P5) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_GAMERON, USB_DEVICE_ID_GAMERON_DUAL_PSX_ADAPTOR) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH, 0x0001) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH, 0x0002) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH, 0x0003) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH, 0x0004) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GLAB, USB_DEVICE_ID_4_PHIDGETSERVO_30) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GLAB, USB_DEVICE_ID_1_PHIDGETSERVO_30) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GLAB, USB_DEVICE_ID_0_0_4_IF_KIT) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GLAB, USB_DEVICE_ID_0_16_16_IF_KIT) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GLAB, USB_DEVICE_ID_8_8_8_IF_KIT) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GLAB, USB_DEVICE_ID_0_8_7_IF_KIT) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GLAB, USB_DEVICE_ID_0_8_8_IF_KIT) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GLAB, USB_DEVICE_ID_PHIDGET_MOTORCONTROL) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GOTOP, USB_DEVICE_ID_SUPER_Q2) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GOTOP, USB_DEVICE_ID_GOGOPEN) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GOTOP, USB_DEVICE_ID_PENPOWER) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0003) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_GRETAGMACBETH, USB_DEVICE_ID_GRETAGMACBETH_HUEY) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GRIFFIN, USB_DEVICE_ID_POWERMATE) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GRIFFIN, USB_DEVICE_ID_SOUNDKNOB) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_90) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_100) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_101) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_103) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_104) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_105) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_106) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_107) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_108) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_200) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_201) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_202) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_203) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_204) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_205) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_206) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_207) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_300) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_301) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_302) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_303) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_304) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_305) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_306) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_307) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_308) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_309) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_400) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_401) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_402) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_403) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_404) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_405) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_500) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_501) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_502) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_503) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_504) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_1000) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_1001) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_1002) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_1003) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_1004) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_1005) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_1006) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_GTCO, USB_DEVICE_ID_GTCO_1007) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_IMATION, USB_DEVICE_ID_DISC_STAKKA) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_KBGEAR, USB_DEVICE_ID_KBGEAR_JAMSTUDIO) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_KYE, USB_DEVICE_ID_KYE_GPEN_560) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_JWM) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_DMMP) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIP) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY1) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY2) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_VIDEOCOM) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_COM3LAB) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_TELEPORT) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_NETWORKANALYSER) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POWERCONTROL) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETEST) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_MCC, USB_DEVICE_ID_MCC_PMD1024LS) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_MCC, USB_DEVICE_ID_MCC_PMD1208LS) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_MICROCHIP, USB_DEVICE_ID_PICKIT1) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_MICROCHIP, USB_DEVICE_ID_PICKIT2) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_NATIONAL_SEMICONDUCTOR, USB_DEVICE_ID_N_S_HARMONY) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ONTRAK, USB_DEVICE_ID_ONTRAK_ADU100) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ONTRAK, USB_DEVICE_ID_ONTRAK_ADU100 + 20) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ONTRAK, USB_DEVICE_ID_ONTRAK_ADU100 + 30) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ONTRAK, USB_DEVICE_ID_ONTRAK_ADU100 + 100) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ONTRAK, USB_DEVICE_ID_ONTRAK_ADU100 + 108) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ONTRAK, USB_DEVICE_ID_ONTRAK_ADU100 + 118) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ONTRAK, USB_DEVICE_ID_ONTRAK_ADU100 + 200) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ONTRAK, USB_DEVICE_ID_ONTRAK_ADU100 + 300) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ONTRAK, USB_DEVICE_ID_ONTRAK_ADU100 + 400) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ONTRAK, USB_DEVICE_ID_ONTRAK_ADU100 + 500) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_PANJIT, 0x0001) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_PANJIT, 0x0002) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_PANJIT, 0x0003) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_PANJIT, 0x0004) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_SOUNDGRAPH, USB_DEVICE_ID_SOUNDGRAPH_IMON_LCD) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_SOUNDGRAPH, USB_DEVICE_ID_SOUNDGRAPH_IMON_LCD2) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_SOUNDGRAPH, USB_DEVICE_ID_SOUNDGRAPH_IMON_LCD3) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_TENX, USB_DEVICE_ID_TENX_IBUDDY1) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_TENX, USB_DEVICE_ID_TENX_IBUDDY2) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_THRUSTMASTER, 0xb300) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_THRUSTMASTER, 0xb304) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_THRUSTMASTER, 0xb651) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_THRUSTMASTER, 0xb654) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_LABPRO) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_GOTEMP) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_SKIP) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_CYCLOPS) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_LCSPEC) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_WACOM, HID_ANY_ID) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_WISEGROUP, USB_DEVICE_ID_4_PHIDGETSERVO_20) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_WISEGROUP, USB_DEVICE_ID_1_PHIDGETSERVO_20) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_WISEGROUP, USB_DEVICE_ID_8_8_4_IF_KIT) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_YEALINK, USB_DEVICE_ID_YEALINK_P1K_P4K_B2K) },
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	{ HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
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	{ }
};

static bool hid_ignore(struct hid_device *hdev)
{
	switch (hdev->vendor) {
	case USB_VENDOR_ID_CODEMERCS:
		/* ignore all Code Mercenaries IOWarrior devices */
		if (hdev->product >= USB_DEVICE_ID_CODEMERCS_IOW_FIRST &&
				hdev->product <= USB_DEVICE_ID_CODEMERCS_IOW_LAST)
			return true;
		break;
	case USB_VENDOR_ID_LOGITECH:
		if (hdev->product >= USB_DEVICE_ID_LOGITECH_HARMONY_FIRST &&
				hdev->product <= USB_DEVICE_ID_LOGITECH_HARMONY_LAST)
			return true;
		break;
	}

	return !!hid_match_id(hdev, hid_ignore_list);
}

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int hid_add_device(struct hid_device *hdev)
{
	static atomic_t id = ATOMIC_INIT(0);
	int ret;

	if (WARN_ON(hdev->status & HID_STAT_ADDED))
		return -EBUSY;

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	/* we need to kill them here, otherwise they will stay allocated to
	 * wait for coming driver */
	if (hid_ignore(hdev))
		return -ENODEV;

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	/* XXX hack, any other cleaner solution < 20 bus_id bytes? */
	sprintf(hdev->dev.bus_id, "%04X:%04X:%04X.%04X", hdev->bus,
			hdev->vendor, hdev->product, atomic_inc_return(&id));

	ret = device_add(&hdev->dev);
	if (!ret)
		hdev->status |= HID_STAT_ADDED;

	return ret;
}
EXPORT_SYMBOL_GPL(hid_add_device);

/**
 * hid_allocate_device - allocate new hid device descriptor
 *
 * Allocate and initialize hid device, so that hid_destroy_device might be
 * used to free it.
 *
 * New hid_device pointer is returned on success, otherwise ERR_PTR encoded
 * error value.
 */
struct hid_device *hid_allocate_device(void)
{
	struct hid_device *hdev;
	unsigned int i;
	int ret = -ENOMEM;

	hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
	if (hdev == NULL)
		return ERR_PTR(ret);

	device_initialize(&hdev->dev);
	hdev->dev.release = hid_device_release;
	hdev->dev.bus = &hid_bus_type;

	hdev->collection = kcalloc(HID_DEFAULT_NUM_COLLECTIONS,
			sizeof(struct hid_collection), GFP_KERNEL);
	if (hdev->collection == NULL)
		goto err;
	hdev->collection_size = HID_DEFAULT_NUM_COLLECTIONS;

	for (i = 0; i < HID_REPORT_TYPES; i++)
		INIT_LIST_HEAD(&hdev->report_enum[i].report_list);

	return hdev;
err:
	put_device(&hdev->dev);
	return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(hid_allocate_device);

static void hid_remove_device(struct hid_device *hdev)
{
	if (hdev->status & HID_STAT_ADDED) {
		device_del(&hdev->dev);
		hdev->status &= ~HID_STAT_ADDED;
	}
}

/**
 * hid_destroy_device - free previously allocated device
 *
 * @hdev: hid device
 *
 * If you allocate hid_device through hid_allocate_device, you should ever
 * free by this function.
 */
void hid_destroy_device(struct hid_device *hdev)
{
	hid_remove_device(hdev);
	put_device(&hdev->dev);
}
EXPORT_SYMBOL_GPL(hid_destroy_device);

int __hid_register_driver(struct hid_driver *hdrv, struct module *owner,
		const char *mod_name)
{
	hdrv->driver.name = hdrv->name;
	hdrv->driver.bus = &hid_bus_type;
	hdrv->driver.owner = owner;
	hdrv->driver.mod_name = mod_name;

	return driver_register(&hdrv->driver);
}
EXPORT_SYMBOL_GPL(__hid_register_driver);

void hid_unregister_driver(struct hid_driver *hdrv)
{
	driver_unregister(&hdrv->driver);
}
EXPORT_SYMBOL_GPL(hid_unregister_driver);

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#ifdef CONFIG_HID_COMPAT
static void hid_compat_load(struct work_struct *ws)
{
	request_module("hid-dummy");
}
static DECLARE_WORK(hid_compat_work, hid_compat_load);
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static struct workqueue_struct *hid_compat_wq;
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#endif

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static int __init hid_init(void)
{
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	int ret;

	ret = bus_register(&hid_bus_type);
	if (ret) {
		printk(KERN_ERR "HID: can't register hid bus\n");
		goto err;
	}

	ret = hidraw_init();
	if (ret)
		goto err_bus;

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#ifdef CONFIG_HID_COMPAT
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	hid_compat_wq = create_workqueue("hid_compat");
	if (!hid_compat_wq) {
		hidraw_exit();
		goto err;
	}
	queue_work(hid_compat_wq, &hid_compat_work);
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#endif

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	return 0;
err_bus:
	bus_unregister(&hid_bus_type);
err:
	return ret;
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}

static void __exit hid_exit(void)
{
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#ifdef CONFIG_HID_COMPAT
	destroy_workqueue(hid_compat_wq);
#endif
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	hidraw_exit();
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	bus_unregister(&hid_bus_type);
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}

module_init(hid_init);
module_exit(hid_exit);

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MODULE_LICENSE(DRIVER_LICENSE);