mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Benjamin Tissoires](/assets/img/avatar_default.png)
We don't gain much by having them as inline, and it actually prevents us to attach a probe to those helpers. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20211202095334.14399-5-benjamin.tissoires@redhat.com
2724 lines
67 KiB
C
2724 lines
67 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* HID support for Linux
|
|
*
|
|
* 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
|
|
* Copyright (c) 2006-2012 Jiri Kosina
|
|
*/
|
|
|
|
/*
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#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>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/semaphore.h>
|
|
|
|
#include <linux/hid.h>
|
|
#include <linux/hiddev.h>
|
|
#include <linux/hid-debug.h>
|
|
#include <linux/hidraw.h>
|
|
|
|
#include "hid-ids.h"
|
|
|
|
/*
|
|
* Version Information
|
|
*/
|
|
|
|
#define DRIVER_DESC "HID core driver"
|
|
|
|
int hid_debug = 0;
|
|
module_param_named(debug, hid_debug, int, 0600);
|
|
MODULE_PARM_DESC(debug, "toggle HID debugging messages");
|
|
EXPORT_SYMBOL_GPL(hid_debug);
|
|
|
|
static int hid_ignore_special_drivers = 0;
|
|
module_param_named(ignore_special_drivers, hid_ignore_special_drivers, int, 0600);
|
|
MODULE_PARM_DESC(ignore_special_drivers, "Ignore any special drivers and handle all devices by generic driver");
|
|
|
|
/*
|
|
* Register a new report for a device.
|
|
*/
|
|
|
|
struct hid_report *hid_register_report(struct hid_device *device,
|
|
unsigned int type, unsigned int id,
|
|
unsigned int application)
|
|
{
|
|
struct hid_report_enum *report_enum = device->report_enum + type;
|
|
struct hid_report *report;
|
|
|
|
if (id >= HID_MAX_IDS)
|
|
return NULL;
|
|
if (report_enum->report_id_hash[id])
|
|
return report_enum->report_id_hash[id];
|
|
|
|
report = kzalloc(sizeof(struct hid_report), GFP_KERNEL);
|
|
if (!report)
|
|
return NULL;
|
|
|
|
if (id != 0)
|
|
report_enum->numbered = 1;
|
|
|
|
report->id = id;
|
|
report->type = type;
|
|
report->size = 0;
|
|
report->device = device;
|
|
report->application = application;
|
|
report_enum->report_id_hash[id] = report;
|
|
|
|
list_add_tail(&report->list, &report_enum->report_list);
|
|
|
|
return report;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_register_report);
|
|
|
|
/*
|
|
* Register a new field for this report.
|
|
*/
|
|
|
|
static struct hid_field *hid_register_field(struct hid_report *report, unsigned usages)
|
|
{
|
|
struct hid_field *field;
|
|
|
|
if (report->maxfield == HID_MAX_FIELDS) {
|
|
hid_err(report->device, "too many fields in report\n");
|
|
return NULL;
|
|
}
|
|
|
|
field = kzalloc((sizeof(struct hid_field) +
|
|
usages * sizeof(struct hid_usage) +
|
|
usages * sizeof(unsigned)), GFP_KERNEL);
|
|
if (!field)
|
|
return NULL;
|
|
|
|
field->index = report->maxfield++;
|
|
report->field[field->index] = field;
|
|
field->usage = (struct hid_usage *)(field + 1);
|
|
field->value = (s32 *)(field->usage + usages);
|
|
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;
|
|
int collection_index;
|
|
|
|
usage = parser->local.usage[0];
|
|
|
|
if (parser->collection_stack_ptr == parser->collection_stack_size) {
|
|
unsigned int *collection_stack;
|
|
unsigned int new_size = parser->collection_stack_size +
|
|
HID_COLLECTION_STACK_SIZE;
|
|
|
|
collection_stack = krealloc(parser->collection_stack,
|
|
new_size * sizeof(unsigned int),
|
|
GFP_KERNEL);
|
|
if (!collection_stack)
|
|
return -ENOMEM;
|
|
|
|
parser->collection_stack = collection_stack;
|
|
parser->collection_stack_size = new_size;
|
|
}
|
|
|
|
if (parser->device->maxcollection == parser->device->collection_size) {
|
|
collection = kmalloc(
|
|
array3_size(sizeof(struct hid_collection),
|
|
parser->device->collection_size,
|
|
2),
|
|
GFP_KERNEL);
|
|
if (collection == NULL) {
|
|
hid_err(parser->device, "failed to reallocate collection array\n");
|
|
return -ENOMEM;
|
|
}
|
|
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_index = parser->device->maxcollection++;
|
|
collection = parser->device->collection + collection_index;
|
|
collection->type = type;
|
|
collection->usage = usage;
|
|
collection->level = parser->collection_stack_ptr - 1;
|
|
collection->parent_idx = (collection->level == 0) ? -1 :
|
|
parser->collection_stack[collection->level - 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) {
|
|
hid_err(parser->device, "collection stack underflow\n");
|
|
return -EINVAL;
|
|
}
|
|
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)
|
|
{
|
|
struct hid_collection *collection = parser->device->collection;
|
|
int n;
|
|
|
|
for (n = parser->collection_stack_ptr - 1; n >= 0; n--) {
|
|
unsigned index = parser->collection_stack[n];
|
|
if (collection[index].type == type)
|
|
return collection[index].usage;
|
|
}
|
|
return 0; /* we know nothing about this usage type */
|
|
}
|
|
|
|
/*
|
|
* Concatenate usage which defines 16 bits or less with the
|
|
* currently defined usage page to form a 32 bit usage
|
|
*/
|
|
|
|
static void complete_usage(struct hid_parser *parser, unsigned int index)
|
|
{
|
|
parser->local.usage[index] &= 0xFFFF;
|
|
parser->local.usage[index] |=
|
|
(parser->global.usage_page & 0xFFFF) << 16;
|
|
}
|
|
|
|
/*
|
|
* Add a usage to the temporary parser table.
|
|
*/
|
|
|
|
static int hid_add_usage(struct hid_parser *parser, unsigned usage, u8 size)
|
|
{
|
|
if (parser->local.usage_index >= HID_MAX_USAGES) {
|
|
hid_err(parser->device, "usage index exceeded\n");
|
|
return -1;
|
|
}
|
|
parser->local.usage[parser->local.usage_index] = usage;
|
|
|
|
/*
|
|
* If Usage item only includes usage id, concatenate it with
|
|
* currently defined usage page
|
|
*/
|
|
if (size <= 2)
|
|
complete_usage(parser, parser->local.usage_index);
|
|
|
|
parser->local.usage_size[parser->local.usage_index] = size;
|
|
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;
|
|
unsigned int usages;
|
|
unsigned int offset;
|
|
unsigned int i;
|
|
unsigned int application;
|
|
|
|
application = hid_lookup_collection(parser, HID_COLLECTION_APPLICATION);
|
|
|
|
report = hid_register_report(parser->device, report_type,
|
|
parser->global.report_id, application);
|
|
if (!report) {
|
|
hid_err(parser->device, "hid_register_report failed\n");
|
|
return -1;
|
|
}
|
|
|
|
/* Handle both signed and unsigned cases properly */
|
|
if ((parser->global.logical_minimum < 0 &&
|
|
parser->global.logical_maximum <
|
|
parser->global.logical_minimum) ||
|
|
(parser->global.logical_minimum >= 0 &&
|
|
(__u32)parser->global.logical_maximum <
|
|
(__u32)parser->global.logical_minimum)) {
|
|
dbg_hid("logical range invalid 0x%x 0x%x\n",
|
|
parser->global.logical_minimum,
|
|
parser->global.logical_maximum);
|
|
return -1;
|
|
}
|
|
|
|
offset = report->size;
|
|
report->size += parser->global.report_size * parser->global.report_count;
|
|
|
|
/* Total size check: Allow for possible report index byte */
|
|
if (report->size > (HID_MAX_BUFFER_SIZE - 1) << 3) {
|
|
hid_err(parser->device, "report is too long\n");
|
|
return -1;
|
|
}
|
|
|
|
if (!parser->local.usage_index) /* Ignore padding fields */
|
|
return 0;
|
|
|
|
usages = max_t(unsigned, parser->local.usage_index,
|
|
parser->global.report_count);
|
|
|
|
field = hid_register_field(report, usages);
|
|
if (!field)
|
|
return 0;
|
|
|
|
field->physical = hid_lookup_collection(parser, HID_COLLECTION_PHYSICAL);
|
|
field->logical = hid_lookup_collection(parser, HID_COLLECTION_LOGICAL);
|
|
field->application = application;
|
|
|
|
for (i = 0; i < usages; i++) {
|
|
unsigned 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->usage[i].usage_index = i;
|
|
field->usage[i].resolution_multiplier = 1;
|
|
}
|
|
|
|
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) {
|
|
case 1: return item->data.u8;
|
|
case 2: return item->data.u16;
|
|
case 4: return item->data.u32;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static s32 item_sdata(struct hid_item *item)
|
|
{
|
|
switch (item->size) {
|
|
case 1: return item->data.s8;
|
|
case 2: return item->data.s16;
|
|
case 4: return item->data.s32;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Process a global item.
|
|
*/
|
|
|
|
static int hid_parser_global(struct hid_parser *parser, struct hid_item *item)
|
|
{
|
|
__s32 raw_value;
|
|
switch (item->tag) {
|
|
case HID_GLOBAL_ITEM_TAG_PUSH:
|
|
|
|
if (parser->global_stack_ptr == HID_GLOBAL_STACK_SIZE) {
|
|
hid_err(parser->device, "global environment stack overflow\n");
|
|
return -1;
|
|
}
|
|
|
|
memcpy(parser->global_stack + parser->global_stack_ptr++,
|
|
&parser->global, sizeof(struct hid_global));
|
|
return 0;
|
|
|
|
case HID_GLOBAL_ITEM_TAG_POP:
|
|
|
|
if (!parser->global_stack_ptr) {
|
|
hid_err(parser->device, "global environment stack underflow\n");
|
|
return -1;
|
|
}
|
|
|
|
memcpy(&parser->global, parser->global_stack +
|
|
--parser->global_stack_ptr, sizeof(struct hid_global));
|
|
return 0;
|
|
|
|
case HID_GLOBAL_ITEM_TAG_USAGE_PAGE:
|
|
parser->global.usage_page = item_udata(item);
|
|
return 0;
|
|
|
|
case HID_GLOBAL_ITEM_TAG_LOGICAL_MINIMUM:
|
|
parser->global.logical_minimum = item_sdata(item);
|
|
return 0;
|
|
|
|
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;
|
|
|
|
case HID_GLOBAL_ITEM_TAG_PHYSICAL_MINIMUM:
|
|
parser->global.physical_minimum = item_sdata(item);
|
|
return 0;
|
|
|
|
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;
|
|
|
|
case HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT:
|
|
/* Many devices provide unit exponent as a two's complement
|
|
* nibble due to the common misunderstanding of HID
|
|
* specification 1.11, 6.2.2.7 Global Items. Attempt to handle
|
|
* both this and the standard encoding. */
|
|
raw_value = item_sdata(item);
|
|
if (!(raw_value & 0xfffffff0))
|
|
parser->global.unit_exponent = hid_snto32(raw_value, 4);
|
|
else
|
|
parser->global.unit_exponent = raw_value;
|
|
return 0;
|
|
|
|
case HID_GLOBAL_ITEM_TAG_UNIT:
|
|
parser->global.unit = item_udata(item);
|
|
return 0;
|
|
|
|
case HID_GLOBAL_ITEM_TAG_REPORT_SIZE:
|
|
parser->global.report_size = item_udata(item);
|
|
if (parser->global.report_size > 256) {
|
|
hid_err(parser->device, "invalid report_size %d\n",
|
|
parser->global.report_size);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
|
|
case HID_GLOBAL_ITEM_TAG_REPORT_COUNT:
|
|
parser->global.report_count = item_udata(item);
|
|
if (parser->global.report_count > HID_MAX_USAGES) {
|
|
hid_err(parser->device, "invalid report_count %d\n",
|
|
parser->global.report_count);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
|
|
case HID_GLOBAL_ITEM_TAG_REPORT_ID:
|
|
parser->global.report_id = item_udata(item);
|
|
if (parser->global.report_id == 0 ||
|
|
parser->global.report_id >= HID_MAX_IDS) {
|
|
hid_err(parser->device, "report_id %u is invalid\n",
|
|
parser->global.report_id);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
|
|
default:
|
|
hid_err(parser->device, "unknown global tag 0x%x\n", item->tag);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Process a local item.
|
|
*/
|
|
|
|
static int hid_parser_local(struct hid_parser *parser, struct hid_item *item)
|
|
{
|
|
__u32 data;
|
|
unsigned n;
|
|
__u32 count;
|
|
|
|
data = item_udata(item);
|
|
|
|
switch (item->tag) {
|
|
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) {
|
|
hid_err(parser->device, "nested delimiters\n");
|
|
return -1;
|
|
}
|
|
parser->local.delimiter_depth++;
|
|
parser->local.delimiter_branch++;
|
|
} else {
|
|
if (parser->local.delimiter_depth < 1) {
|
|
hid_err(parser->device, "bogus close delimiter\n");
|
|
return -1;
|
|
}
|
|
parser->local.delimiter_depth--;
|
|
}
|
|
return 0;
|
|
|
|
case HID_LOCAL_ITEM_TAG_USAGE:
|
|
|
|
if (parser->local.delimiter_branch > 1) {
|
|
dbg_hid("alternative usage ignored\n");
|
|
return 0;
|
|
}
|
|
|
|
return hid_add_usage(parser, data, item->size);
|
|
|
|
case HID_LOCAL_ITEM_TAG_USAGE_MINIMUM:
|
|
|
|
if (parser->local.delimiter_branch > 1) {
|
|
dbg_hid("alternative usage ignored\n");
|
|
return 0;
|
|
}
|
|
|
|
parser->local.usage_minimum = data;
|
|
return 0;
|
|
|
|
case HID_LOCAL_ITEM_TAG_USAGE_MAXIMUM:
|
|
|
|
if (parser->local.delimiter_branch > 1) {
|
|
dbg_hid("alternative usage ignored\n");
|
|
return 0;
|
|
}
|
|
|
|
count = data - parser->local.usage_minimum;
|
|
if (count + parser->local.usage_index >= HID_MAX_USAGES) {
|
|
/*
|
|
* We do not warn if the name is not set, we are
|
|
* actually pre-scanning the device.
|
|
*/
|
|
if (dev_name(&parser->device->dev))
|
|
hid_warn(parser->device,
|
|
"ignoring exceeding usage max\n");
|
|
data = HID_MAX_USAGES - parser->local.usage_index +
|
|
parser->local.usage_minimum - 1;
|
|
if (data <= 0) {
|
|
hid_err(parser->device,
|
|
"no more usage index available\n");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
for (n = parser->local.usage_minimum; n <= data; n++)
|
|
if (hid_add_usage(parser, n, item->size)) {
|
|
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;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Concatenate Usage Pages into Usages where relevant:
|
|
* As per specification, 6.2.2.8: "When the parser encounters a main item it
|
|
* concatenates the last declared Usage Page with a Usage to form a complete
|
|
* usage value."
|
|
*/
|
|
|
|
static void hid_concatenate_last_usage_page(struct hid_parser *parser)
|
|
{
|
|
int i;
|
|
unsigned int usage_page;
|
|
unsigned int current_page;
|
|
|
|
if (!parser->local.usage_index)
|
|
return;
|
|
|
|
usage_page = parser->global.usage_page;
|
|
|
|
/*
|
|
* Concatenate usage page again only if last declared Usage Page
|
|
* has not been already used in previous usages concatenation
|
|
*/
|
|
for (i = parser->local.usage_index - 1; i >= 0; i--) {
|
|
if (parser->local.usage_size[i] > 2)
|
|
/* Ignore extended usages */
|
|
continue;
|
|
|
|
current_page = parser->local.usage[i] >> 16;
|
|
if (current_page == usage_page)
|
|
break;
|
|
|
|
complete_usage(parser, i);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Process a main item.
|
|
*/
|
|
|
|
static int hid_parser_main(struct hid_parser *parser, struct hid_item *item)
|
|
{
|
|
__u32 data;
|
|
int ret;
|
|
|
|
hid_concatenate_last_usage_page(parser);
|
|
|
|
data = item_udata(item);
|
|
|
|
switch (item->tag) {
|
|
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:
|
|
hid_warn(parser->device, "unknown main item tag 0x%x\n", item->tag);
|
|
ret = 0;
|
|
}
|
|
|
|
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)
|
|
{
|
|
dbg_hid("reserved item type, tag 0x%x\n", item->tag);
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Close report. This function returns the device
|
|
* state to the point prior to hid_open_report().
|
|
*/
|
|
static void hid_close_report(struct hid_device *device)
|
|
{
|
|
unsigned i, j;
|
|
|
|
for (i = 0; i < HID_REPORT_TYPES; i++) {
|
|
struct hid_report_enum *report_enum = device->report_enum + i;
|
|
|
|
for (j = 0; j < HID_MAX_IDS; j++) {
|
|
struct hid_report *report = report_enum->report_id_hash[j];
|
|
if (report)
|
|
hid_free_report(report);
|
|
}
|
|
memset(report_enum, 0, sizeof(*report_enum));
|
|
INIT_LIST_HEAD(&report_enum->report_list);
|
|
}
|
|
|
|
kfree(device->rdesc);
|
|
device->rdesc = NULL;
|
|
device->rsize = 0;
|
|
|
|
kfree(device->collection);
|
|
device->collection = NULL;
|
|
device->collection_size = 0;
|
|
device->maxcollection = 0;
|
|
device->maxapplication = 0;
|
|
|
|
device->status &= ~HID_STAT_PARSED;
|
|
}
|
|
|
|
/*
|
|
* Free a device structure, all reports, and all fields.
|
|
*/
|
|
|
|
static void hid_device_release(struct device *dev)
|
|
{
|
|
struct hid_device *hid = to_hid_device(dev);
|
|
|
|
hid_close_report(hid);
|
|
kfree(hid->dev_rdesc);
|
|
kfree(hid);
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
case 0:
|
|
return start;
|
|
|
|
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;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void hid_scan_input_usage(struct hid_parser *parser, u32 usage)
|
|
{
|
|
struct hid_device *hid = parser->device;
|
|
|
|
if (usage == HID_DG_CONTACTID)
|
|
hid->group = HID_GROUP_MULTITOUCH;
|
|
}
|
|
|
|
static void hid_scan_feature_usage(struct hid_parser *parser, u32 usage)
|
|
{
|
|
if (usage == 0xff0000c5 && parser->global.report_count == 256 &&
|
|
parser->global.report_size == 8)
|
|
parser->scan_flags |= HID_SCAN_FLAG_MT_WIN_8;
|
|
|
|
if (usage == 0xff0000c6 && parser->global.report_count == 1 &&
|
|
parser->global.report_size == 8)
|
|
parser->scan_flags |= HID_SCAN_FLAG_MT_WIN_8;
|
|
}
|
|
|
|
static void hid_scan_collection(struct hid_parser *parser, unsigned type)
|
|
{
|
|
struct hid_device *hid = parser->device;
|
|
int i;
|
|
|
|
if (((parser->global.usage_page << 16) == HID_UP_SENSOR) &&
|
|
type == HID_COLLECTION_PHYSICAL)
|
|
hid->group = HID_GROUP_SENSOR_HUB;
|
|
|
|
if (hid->vendor == USB_VENDOR_ID_MICROSOFT &&
|
|
hid->product == USB_DEVICE_ID_MS_POWER_COVER &&
|
|
hid->group == HID_GROUP_MULTITOUCH)
|
|
hid->group = HID_GROUP_GENERIC;
|
|
|
|
if ((parser->global.usage_page << 16) == HID_UP_GENDESK)
|
|
for (i = 0; i < parser->local.usage_index; i++)
|
|
if (parser->local.usage[i] == HID_GD_POINTER)
|
|
parser->scan_flags |= HID_SCAN_FLAG_GD_POINTER;
|
|
|
|
if ((parser->global.usage_page << 16) >= HID_UP_MSVENDOR)
|
|
parser->scan_flags |= HID_SCAN_FLAG_VENDOR_SPECIFIC;
|
|
|
|
if ((parser->global.usage_page << 16) == HID_UP_GOOGLEVENDOR)
|
|
for (i = 0; i < parser->local.usage_index; i++)
|
|
if (parser->local.usage[i] ==
|
|
(HID_UP_GOOGLEVENDOR | 0x0001))
|
|
parser->device->group =
|
|
HID_GROUP_VIVALDI;
|
|
}
|
|
|
|
static int hid_scan_main(struct hid_parser *parser, struct hid_item *item)
|
|
{
|
|
__u32 data;
|
|
int i;
|
|
|
|
hid_concatenate_last_usage_page(parser);
|
|
|
|
data = item_udata(item);
|
|
|
|
switch (item->tag) {
|
|
case HID_MAIN_ITEM_TAG_BEGIN_COLLECTION:
|
|
hid_scan_collection(parser, data & 0xff);
|
|
break;
|
|
case HID_MAIN_ITEM_TAG_END_COLLECTION:
|
|
break;
|
|
case HID_MAIN_ITEM_TAG_INPUT:
|
|
/* ignore constant inputs, they will be ignored by hid-input */
|
|
if (data & HID_MAIN_ITEM_CONSTANT)
|
|
break;
|
|
for (i = 0; i < parser->local.usage_index; i++)
|
|
hid_scan_input_usage(parser, parser->local.usage[i]);
|
|
break;
|
|
case HID_MAIN_ITEM_TAG_OUTPUT:
|
|
break;
|
|
case HID_MAIN_ITEM_TAG_FEATURE:
|
|
for (i = 0; i < parser->local.usage_index; i++)
|
|
hid_scan_feature_usage(parser, parser->local.usage[i]);
|
|
break;
|
|
}
|
|
|
|
/* Reset the local parser environment */
|
|
memset(&parser->local, 0, sizeof(parser->local));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Scan a report descriptor before the device is added to the bus.
|
|
* Sets device groups and other properties that determine what driver
|
|
* to load.
|
|
*/
|
|
static int hid_scan_report(struct hid_device *hid)
|
|
{
|
|
struct hid_parser *parser;
|
|
struct hid_item item;
|
|
__u8 *start = hid->dev_rdesc;
|
|
__u8 *end = start + hid->dev_rsize;
|
|
static int (*dispatch_type[])(struct hid_parser *parser,
|
|
struct hid_item *item) = {
|
|
hid_scan_main,
|
|
hid_parser_global,
|
|
hid_parser_local,
|
|
hid_parser_reserved
|
|
};
|
|
|
|
parser = vzalloc(sizeof(struct hid_parser));
|
|
if (!parser)
|
|
return -ENOMEM;
|
|
|
|
parser->device = hid;
|
|
hid->group = HID_GROUP_GENERIC;
|
|
|
|
/*
|
|
* The parsing is simpler than the one in hid_open_report() as we should
|
|
* be robust against hid errors. Those errors will be raised by
|
|
* hid_open_report() anyway.
|
|
*/
|
|
while ((start = fetch_item(start, end, &item)) != NULL)
|
|
dispatch_type[item.type](parser, &item);
|
|
|
|
/*
|
|
* Handle special flags set during scanning.
|
|
*/
|
|
if ((parser->scan_flags & HID_SCAN_FLAG_MT_WIN_8) &&
|
|
(hid->group == HID_GROUP_MULTITOUCH))
|
|
hid->group = HID_GROUP_MULTITOUCH_WIN_8;
|
|
|
|
/*
|
|
* Vendor specific handlings
|
|
*/
|
|
switch (hid->vendor) {
|
|
case USB_VENDOR_ID_WACOM:
|
|
hid->group = HID_GROUP_WACOM;
|
|
break;
|
|
case USB_VENDOR_ID_SYNAPTICS:
|
|
if (hid->group == HID_GROUP_GENERIC)
|
|
if ((parser->scan_flags & HID_SCAN_FLAG_VENDOR_SPECIFIC)
|
|
&& (parser->scan_flags & HID_SCAN_FLAG_GD_POINTER))
|
|
/*
|
|
* hid-rmi should take care of them,
|
|
* not hid-generic
|
|
*/
|
|
hid->group = HID_GROUP_RMI;
|
|
break;
|
|
}
|
|
|
|
kfree(parser->collection_stack);
|
|
vfree(parser);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* hid_parse_report - parse device report
|
|
*
|
|
* @hid: hid device
|
|
* @start: report start
|
|
* @size: report size
|
|
*
|
|
* Allocate the device report as read by the bus driver. This function should
|
|
* only be called from parse() in ll drivers.
|
|
*/
|
|
int hid_parse_report(struct hid_device *hid, __u8 *start, unsigned size)
|
|
{
|
|
hid->dev_rdesc = kmemdup(start, size, GFP_KERNEL);
|
|
if (!hid->dev_rdesc)
|
|
return -ENOMEM;
|
|
hid->dev_rsize = size;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_parse_report);
|
|
|
|
static const char * const hid_report_names[] = {
|
|
"HID_INPUT_REPORT",
|
|
"HID_OUTPUT_REPORT",
|
|
"HID_FEATURE_REPORT",
|
|
};
|
|
/**
|
|
* hid_validate_values - validate existing device report's value indexes
|
|
*
|
|
* @hid: hid device
|
|
* @type: which report type to examine
|
|
* @id: which report ID to examine (0 for first)
|
|
* @field_index: which report field to examine
|
|
* @report_counts: expected number of values
|
|
*
|
|
* Validate the number of values in a given field of a given report, after
|
|
* parsing.
|
|
*/
|
|
struct hid_report *hid_validate_values(struct hid_device *hid,
|
|
unsigned int type, unsigned int id,
|
|
unsigned int field_index,
|
|
unsigned int report_counts)
|
|
{
|
|
struct hid_report *report;
|
|
|
|
if (type > HID_FEATURE_REPORT) {
|
|
hid_err(hid, "invalid HID report type %u\n", type);
|
|
return NULL;
|
|
}
|
|
|
|
if (id >= HID_MAX_IDS) {
|
|
hid_err(hid, "invalid HID report id %u\n", id);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Explicitly not using hid_get_report() here since it depends on
|
|
* ->numbered being checked, which may not always be the case when
|
|
* drivers go to access report values.
|
|
*/
|
|
if (id == 0) {
|
|
/*
|
|
* Validating on id 0 means we should examine the first
|
|
* report in the list.
|
|
*/
|
|
report = list_entry(
|
|
hid->report_enum[type].report_list.next,
|
|
struct hid_report, list);
|
|
} else {
|
|
report = hid->report_enum[type].report_id_hash[id];
|
|
}
|
|
if (!report) {
|
|
hid_err(hid, "missing %s %u\n", hid_report_names[type], id);
|
|
return NULL;
|
|
}
|
|
if (report->maxfield <= field_index) {
|
|
hid_err(hid, "not enough fields in %s %u\n",
|
|
hid_report_names[type], id);
|
|
return NULL;
|
|
}
|
|
if (report->field[field_index]->report_count < report_counts) {
|
|
hid_err(hid, "not enough values in %s %u field %u\n",
|
|
hid_report_names[type], id, field_index);
|
|
return NULL;
|
|
}
|
|
return report;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_validate_values);
|
|
|
|
static int hid_calculate_multiplier(struct hid_device *hid,
|
|
struct hid_field *multiplier)
|
|
{
|
|
int m;
|
|
__s32 v = *multiplier->value;
|
|
__s32 lmin = multiplier->logical_minimum;
|
|
__s32 lmax = multiplier->logical_maximum;
|
|
__s32 pmin = multiplier->physical_minimum;
|
|
__s32 pmax = multiplier->physical_maximum;
|
|
|
|
/*
|
|
* "Because OS implementations will generally divide the control's
|
|
* reported count by the Effective Resolution Multiplier, designers
|
|
* should take care not to establish a potential Effective
|
|
* Resolution Multiplier of zero."
|
|
* HID Usage Table, v1.12, Section 4.3.1, p31
|
|
*/
|
|
if (lmax - lmin == 0)
|
|
return 1;
|
|
/*
|
|
* Handling the unit exponent is left as an exercise to whoever
|
|
* finds a device where that exponent is not 0.
|
|
*/
|
|
m = ((v - lmin)/(lmax - lmin) * (pmax - pmin) + pmin);
|
|
if (unlikely(multiplier->unit_exponent != 0)) {
|
|
hid_warn(hid,
|
|
"unsupported Resolution Multiplier unit exponent %d\n",
|
|
multiplier->unit_exponent);
|
|
}
|
|
|
|
/* There are no devices with an effective multiplier > 255 */
|
|
if (unlikely(m == 0 || m > 255 || m < -255)) {
|
|
hid_warn(hid, "unsupported Resolution Multiplier %d\n", m);
|
|
m = 1;
|
|
}
|
|
|
|
return m;
|
|
}
|
|
|
|
static void hid_apply_multiplier_to_field(struct hid_device *hid,
|
|
struct hid_field *field,
|
|
struct hid_collection *multiplier_collection,
|
|
int effective_multiplier)
|
|
{
|
|
struct hid_collection *collection;
|
|
struct hid_usage *usage;
|
|
int i;
|
|
|
|
/*
|
|
* If multiplier_collection is NULL, the multiplier applies
|
|
* to all fields in the report.
|
|
* Otherwise, it is the Logical Collection the multiplier applies to
|
|
* but our field may be in a subcollection of that collection.
|
|
*/
|
|
for (i = 0; i < field->maxusage; i++) {
|
|
usage = &field->usage[i];
|
|
|
|
collection = &hid->collection[usage->collection_index];
|
|
while (collection->parent_idx != -1 &&
|
|
collection != multiplier_collection)
|
|
collection = &hid->collection[collection->parent_idx];
|
|
|
|
if (collection->parent_idx != -1 ||
|
|
multiplier_collection == NULL)
|
|
usage->resolution_multiplier = effective_multiplier;
|
|
|
|
}
|
|
}
|
|
|
|
static void hid_apply_multiplier(struct hid_device *hid,
|
|
struct hid_field *multiplier)
|
|
{
|
|
struct hid_report_enum *rep_enum;
|
|
struct hid_report *rep;
|
|
struct hid_field *field;
|
|
struct hid_collection *multiplier_collection;
|
|
int effective_multiplier;
|
|
int i;
|
|
|
|
/*
|
|
* "The Resolution Multiplier control must be contained in the same
|
|
* Logical Collection as the control(s) to which it is to be applied.
|
|
* If no Resolution Multiplier is defined, then the Resolution
|
|
* Multiplier defaults to 1. If more than one control exists in a
|
|
* Logical Collection, the Resolution Multiplier is associated with
|
|
* all controls in the collection. If no Logical Collection is
|
|
* defined, the Resolution Multiplier is associated with all
|
|
* controls in the report."
|
|
* HID Usage Table, v1.12, Section 4.3.1, p30
|
|
*
|
|
* Thus, search from the current collection upwards until we find a
|
|
* logical collection. Then search all fields for that same parent
|
|
* collection. Those are the fields the multiplier applies to.
|
|
*
|
|
* If we have more than one multiplier, it will overwrite the
|
|
* applicable fields later.
|
|
*/
|
|
multiplier_collection = &hid->collection[multiplier->usage->collection_index];
|
|
while (multiplier_collection->parent_idx != -1 &&
|
|
multiplier_collection->type != HID_COLLECTION_LOGICAL)
|
|
multiplier_collection = &hid->collection[multiplier_collection->parent_idx];
|
|
|
|
effective_multiplier = hid_calculate_multiplier(hid, multiplier);
|
|
|
|
rep_enum = &hid->report_enum[HID_INPUT_REPORT];
|
|
list_for_each_entry(rep, &rep_enum->report_list, list) {
|
|
for (i = 0; i < rep->maxfield; i++) {
|
|
field = rep->field[i];
|
|
hid_apply_multiplier_to_field(hid, field,
|
|
multiplier_collection,
|
|
effective_multiplier);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* hid_setup_resolution_multiplier - set up all resolution multipliers
|
|
*
|
|
* @device: hid device
|
|
*
|
|
* Search for all Resolution Multiplier Feature Reports and apply their
|
|
* value to all matching Input items. This only updates the internal struct
|
|
* fields.
|
|
*
|
|
* The Resolution Multiplier is applied by the hardware. If the multiplier
|
|
* is anything other than 1, the hardware will send pre-multiplied events
|
|
* so that the same physical interaction generates an accumulated
|
|
* accumulated_value = value * * multiplier
|
|
* This may be achieved by sending
|
|
* - "value * multiplier" for each event, or
|
|
* - "value" but "multiplier" times as frequently, or
|
|
* - a combination of the above
|
|
* The only guarantee is that the same physical interaction always generates
|
|
* an accumulated 'value * multiplier'.
|
|
*
|
|
* This function must be called before any event processing and after
|
|
* any SetRequest to the Resolution Multiplier.
|
|
*/
|
|
void hid_setup_resolution_multiplier(struct hid_device *hid)
|
|
{
|
|
struct hid_report_enum *rep_enum;
|
|
struct hid_report *rep;
|
|
struct hid_usage *usage;
|
|
int i, j;
|
|
|
|
rep_enum = &hid->report_enum[HID_FEATURE_REPORT];
|
|
list_for_each_entry(rep, &rep_enum->report_list, list) {
|
|
for (i = 0; i < rep->maxfield; i++) {
|
|
/* Ignore if report count is out of bounds. */
|
|
if (rep->field[i]->report_count < 1)
|
|
continue;
|
|
|
|
for (j = 0; j < rep->field[i]->maxusage; j++) {
|
|
usage = &rep->field[i]->usage[j];
|
|
if (usage->hid == HID_GD_RESOLUTION_MULTIPLIER)
|
|
hid_apply_multiplier(hid,
|
|
rep->field[i]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_setup_resolution_multiplier);
|
|
|
|
/**
|
|
* hid_open_report - open a driver-specific device report
|
|
*
|
|
* @device: hid device
|
|
*
|
|
* Parse a report description into a hid_device structure. Reports are
|
|
* enumerated, fields are attached to these reports.
|
|
* 0 returned on success, otherwise nonzero error value.
|
|
*
|
|
* This function (or the equivalent hid_parse() macro) should only be
|
|
* called from probe() in drivers, before starting the device.
|
|
*/
|
|
int hid_open_report(struct hid_device *device)
|
|
{
|
|
struct hid_parser *parser;
|
|
struct hid_item item;
|
|
unsigned int size;
|
|
__u8 *start;
|
|
__u8 *buf;
|
|
__u8 *end;
|
|
__u8 *next;
|
|
int ret;
|
|
static int (*dispatch_type[])(struct hid_parser *parser,
|
|
struct hid_item *item) = {
|
|
hid_parser_main,
|
|
hid_parser_global,
|
|
hid_parser_local,
|
|
hid_parser_reserved
|
|
};
|
|
|
|
if (WARN_ON(device->status & HID_STAT_PARSED))
|
|
return -EBUSY;
|
|
|
|
start = device->dev_rdesc;
|
|
if (WARN_ON(!start))
|
|
return -ENODEV;
|
|
size = device->dev_rsize;
|
|
|
|
buf = kmemdup(start, size, GFP_KERNEL);
|
|
if (buf == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (device->driver->report_fixup)
|
|
start = device->driver->report_fixup(device, buf, &size);
|
|
else
|
|
start = buf;
|
|
|
|
start = kmemdup(start, size, GFP_KERNEL);
|
|
kfree(buf);
|
|
if (start == NULL)
|
|
return -ENOMEM;
|
|
|
|
device->rdesc = start;
|
|
device->rsize = size;
|
|
|
|
parser = vzalloc(sizeof(struct hid_parser));
|
|
if (!parser) {
|
|
ret = -ENOMEM;
|
|
goto alloc_err;
|
|
}
|
|
|
|
parser->device = device;
|
|
|
|
end = start + size;
|
|
|
|
device->collection = kcalloc(HID_DEFAULT_NUM_COLLECTIONS,
|
|
sizeof(struct hid_collection), GFP_KERNEL);
|
|
if (!device->collection) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
device->collection_size = HID_DEFAULT_NUM_COLLECTIONS;
|
|
|
|
ret = -EINVAL;
|
|
while ((next = fetch_item(start, end, &item)) != NULL) {
|
|
start = next;
|
|
|
|
if (item.format != HID_ITEM_FORMAT_SHORT) {
|
|
hid_err(device, "unexpected long global item\n");
|
|
goto err;
|
|
}
|
|
|
|
if (dispatch_type[item.type](parser, &item)) {
|
|
hid_err(device, "item %u %u %u %u parsing failed\n",
|
|
item.format, (unsigned)item.size,
|
|
(unsigned)item.type, (unsigned)item.tag);
|
|
goto err;
|
|
}
|
|
|
|
if (start == end) {
|
|
if (parser->collection_stack_ptr) {
|
|
hid_err(device, "unbalanced collection at end of report description\n");
|
|
goto err;
|
|
}
|
|
if (parser->local.delimiter_depth) {
|
|
hid_err(device, "unbalanced delimiter at end of report description\n");
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* fetch initial values in case the device's
|
|
* default multiplier isn't the recommended 1
|
|
*/
|
|
hid_setup_resolution_multiplier(device);
|
|
|
|
kfree(parser->collection_stack);
|
|
vfree(parser);
|
|
device->status |= HID_STAT_PARSED;
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
hid_err(device, "item fetching failed at offset %u/%u\n",
|
|
size - (unsigned int)(end - start), size);
|
|
err:
|
|
kfree(parser->collection_stack);
|
|
alloc_err:
|
|
vfree(parser);
|
|
hid_close_report(device);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_open_report);
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
if (!value || !n)
|
|
return 0;
|
|
|
|
switch (n) {
|
|
case 8: return ((__s8)value);
|
|
case 16: return ((__s16)value);
|
|
case 32: return ((__s32)value);
|
|
}
|
|
return value & (1 << (n - 1)) ? value | (~0U << n) : value;
|
|
}
|
|
|
|
s32 hid_snto32(__u32 value, unsigned n)
|
|
{
|
|
return snto32(value, n);
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_snto32);
|
|
|
|
/*
|
|
* 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/hidpage/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 u32 __extract(u8 *report, unsigned offset, int n)
|
|
{
|
|
unsigned int idx = offset / 8;
|
|
unsigned int bit_nr = 0;
|
|
unsigned int bit_shift = offset % 8;
|
|
int bits_to_copy = 8 - bit_shift;
|
|
u32 value = 0;
|
|
u32 mask = n < 32 ? (1U << n) - 1 : ~0U;
|
|
|
|
while (n > 0) {
|
|
value |= ((u32)report[idx] >> bit_shift) << bit_nr;
|
|
n -= bits_to_copy;
|
|
bit_nr += bits_to_copy;
|
|
bits_to_copy = 8;
|
|
bit_shift = 0;
|
|
idx++;
|
|
}
|
|
|
|
return value & mask;
|
|
}
|
|
|
|
u32 hid_field_extract(const struct hid_device *hid, u8 *report,
|
|
unsigned offset, unsigned n)
|
|
{
|
|
if (n > 32) {
|
|
hid_warn_once(hid, "%s() called with n (%d) > 32! (%s)\n",
|
|
__func__, n, current->comm);
|
|
n = 32;
|
|
}
|
|
|
|
return __extract(report, offset, n);
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_field_extract);
|
|
|
|
/*
|
|
* "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 endian bit stream.
|
|
*/
|
|
|
|
static void __implement(u8 *report, unsigned offset, int n, u32 value)
|
|
{
|
|
unsigned int idx = offset / 8;
|
|
unsigned int bit_shift = offset % 8;
|
|
int bits_to_set = 8 - bit_shift;
|
|
|
|
while (n - bits_to_set >= 0) {
|
|
report[idx] &= ~(0xff << bit_shift);
|
|
report[idx] |= value << bit_shift;
|
|
value >>= bits_to_set;
|
|
n -= bits_to_set;
|
|
bits_to_set = 8;
|
|
bit_shift = 0;
|
|
idx++;
|
|
}
|
|
|
|
/* last nibble */
|
|
if (n) {
|
|
u8 bit_mask = ((1U << n) - 1);
|
|
report[idx] &= ~(bit_mask << bit_shift);
|
|
report[idx] |= value << bit_shift;
|
|
}
|
|
}
|
|
|
|
static void implement(const struct hid_device *hid, u8 *report,
|
|
unsigned offset, unsigned n, u32 value)
|
|
{
|
|
if (unlikely(n > 32)) {
|
|
hid_warn(hid, "%s() called with n (%d) > 32! (%s)\n",
|
|
__func__, n, current->comm);
|
|
n = 32;
|
|
} else if (n < 32) {
|
|
u32 m = (1U << n) - 1;
|
|
|
|
if (unlikely(value > m)) {
|
|
hid_warn(hid,
|
|
"%s() called with too large value %d (n: %d)! (%s)\n",
|
|
__func__, value, n, current->comm);
|
|
WARN_ON(1);
|
|
value &= m;
|
|
}
|
|
}
|
|
|
|
__implement(report, offset, n, value);
|
|
}
|
|
|
|
/*
|
|
* Search an array for a value.
|
|
*/
|
|
|
|
static int search(__s32 *array, __s32 value, unsigned n)
|
|
{
|
|
while (n--) {
|
|
if (*array++ == value)
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* hid_match_report - check if driver's raw_event should be called
|
|
*
|
|
* @hid: hid device
|
|
* @report: hid report 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)
|
|
{
|
|
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;
|
|
|
|
if (!list_empty(&hid->debug_list))
|
|
hid_dump_input(hid, usage, value);
|
|
|
|
if (hdrv && hdrv->event && hid_match_usage(hid, usage)) {
|
|
ret = hdrv->event(hid, field, usage, value);
|
|
if (ret != 0) {
|
|
if (ret < 0)
|
|
hid_err(hid, "%s's event failed with %d\n",
|
|
hdrv->name, ret);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (hid->claimed & HID_CLAIMED_INPUT)
|
|
hidinput_hid_event(hid, field, usage, value);
|
|
if (hid->claimed & HID_CLAIMED_HIDDEV && interrupt && hid->hiddev_hid_event)
|
|
hid->hiddev_hid_event(hid, field, usage, value);
|
|
}
|
|
|
|
/*
|
|
* 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).
|
|
*/
|
|
|
|
static void hid_input_field(struct hid_device *hid, struct hid_field *field,
|
|
__u8 *data, int interrupt)
|
|
{
|
|
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;
|
|
|
|
value = kmalloc_array(count, sizeof(__s32), GFP_ATOMIC);
|
|
if (!value)
|
|
return;
|
|
|
|
for (n = 0; n < count; n++) {
|
|
|
|
value[n] = min < 0 ?
|
|
snto32(hid_field_extract(hid, data, offset + n * size,
|
|
size), size) :
|
|
hid_field_extract(hid, data, offset + n * size, size);
|
|
|
|
/* Ignore report if ErrorRollOver */
|
|
if (!(field->flags & HID_MAIN_ITEM_VARIABLE) &&
|
|
value[n] >= min && value[n] <= max &&
|
|
value[n] - min < field->maxusage &&
|
|
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->value[n] - min < field->maxusage
|
|
&& 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
|
|
&& value[n] - min < field->maxusage
|
|
&& 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(const struct hid_device *hid,
|
|
struct hid_field *field, __u8 *data)
|
|
{
|
|
unsigned count = field->report_count;
|
|
unsigned offset = field->report_offset;
|
|
unsigned size = field->report_size;
|
|
unsigned n;
|
|
|
|
for (n = 0; n < count; n++) {
|
|
if (field->logical_minimum < 0) /* signed values */
|
|
implement(hid, data, offset + n * size, size,
|
|
s32ton(field->value[n], size));
|
|
else /* unsigned values */
|
|
implement(hid, data, offset + n * size, size,
|
|
field->value[n]);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Compute the size of a report.
|
|
*/
|
|
static size_t hid_compute_report_size(struct hid_report *report)
|
|
{
|
|
if (report->size)
|
|
return ((report->size - 1) >> 3) + 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Create a report. 'data' has to be allocated using
|
|
* hid_alloc_report_buf() so that it has proper size.
|
|
*/
|
|
|
|
void hid_output_report(struct hid_report *report, __u8 *data)
|
|
{
|
|
unsigned n;
|
|
|
|
if (report->id > 0)
|
|
*data++ = report->id;
|
|
|
|
memset(data, 0, hid_compute_report_size(report));
|
|
for (n = 0; n < report->maxfield; n++)
|
|
hid_output_field(report->device, report->field[n], data);
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_output_report);
|
|
|
|
/*
|
|
* Allocator for buffer that is going to be passed to hid_output_report()
|
|
*/
|
|
u8 *hid_alloc_report_buf(struct hid_report *report, gfp_t flags)
|
|
{
|
|
/*
|
|
* 7 extra bytes are necessary to achieve proper functionality
|
|
* of implement() working on 8 byte chunks
|
|
*/
|
|
|
|
u32 len = hid_report_len(report) + 7;
|
|
|
|
return kmalloc(len, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_alloc_report_buf);
|
|
|
|
/*
|
|
* 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;
|
|
|
|
if (!field)
|
|
return -1;
|
|
|
|
size = field->report_size;
|
|
|
|
hid_dump_input(field->report->device, field->usage + offset, value);
|
|
|
|
if (offset >= field->report_count) {
|
|
hid_err(field->report->device, "offset (%d) exceeds report_count (%d)\n",
|
|
offset, field->report_count);
|
|
return -1;
|
|
}
|
|
if (field->logical_minimum < 0) {
|
|
if (value != snto32(s32ton(value, size), size)) {
|
|
hid_err(field->report->device, "value %d is out of range\n", value);
|
|
return -1;
|
|
}
|
|
}
|
|
field->value[offset] = value;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_set_field);
|
|
|
|
static struct hid_report *hid_get_report(struct hid_report_enum *report_enum,
|
|
const u8 *data)
|
|
{
|
|
struct hid_report *report;
|
|
unsigned int n = 0; /* Normally report number is 0 */
|
|
|
|
/* Device uses numbered reports, data[0] is report number */
|
|
if (report_enum->numbered)
|
|
n = *data;
|
|
|
|
report = report_enum->report_id_hash[n];
|
|
if (report == NULL)
|
|
dbg_hid("undefined report_id %u received\n", n);
|
|
|
|
return report;
|
|
}
|
|
|
|
/*
|
|
* Implement a generic .request() callback, using .raw_request()
|
|
* DO NOT USE in hid drivers directly, but through hid_hw_request instead.
|
|
*/
|
|
int __hid_request(struct hid_device *hid, struct hid_report *report,
|
|
int reqtype)
|
|
{
|
|
char *buf;
|
|
int ret;
|
|
u32 len;
|
|
|
|
buf = hid_alloc_report_buf(report, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
len = hid_report_len(report);
|
|
|
|
if (reqtype == HID_REQ_SET_REPORT)
|
|
hid_output_report(report, buf);
|
|
|
|
ret = hid->ll_driver->raw_request(hid, report->id, buf, len,
|
|
report->type, reqtype);
|
|
if (ret < 0) {
|
|
dbg_hid("unable to complete request: %d\n", ret);
|
|
goto out;
|
|
}
|
|
|
|
if (reqtype == HID_REQ_GET_REPORT)
|
|
hid_input_report(hid, report->type, buf, ret, 0);
|
|
|
|
ret = 0;
|
|
|
|
out:
|
|
kfree(buf);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__hid_request);
|
|
|
|
int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size,
|
|
int interrupt)
|
|
{
|
|
struct hid_report_enum *report_enum = hid->report_enum + type;
|
|
struct hid_report *report;
|
|
struct hid_driver *hdrv;
|
|
unsigned int a;
|
|
u32 rsize, csize = size;
|
|
u8 *cdata = data;
|
|
int ret = 0;
|
|
|
|
report = hid_get_report(report_enum, data);
|
|
if (!report)
|
|
goto out;
|
|
|
|
if (report_enum->numbered) {
|
|
cdata++;
|
|
csize--;
|
|
}
|
|
|
|
rsize = hid_compute_report_size(report);
|
|
|
|
if (report_enum->numbered && rsize >= HID_MAX_BUFFER_SIZE)
|
|
rsize = HID_MAX_BUFFER_SIZE - 1;
|
|
else if (rsize > HID_MAX_BUFFER_SIZE)
|
|
rsize = HID_MAX_BUFFER_SIZE;
|
|
|
|
if (csize < rsize) {
|
|
dbg_hid("report %d is too short, (%d < %d)\n", report->id,
|
|
csize, rsize);
|
|
memset(cdata + csize, 0, rsize - csize);
|
|
}
|
|
|
|
if ((hid->claimed & HID_CLAIMED_HIDDEV) && hid->hiddev_report_event)
|
|
hid->hiddev_report_event(hid, report);
|
|
if (hid->claimed & HID_CLAIMED_HIDRAW) {
|
|
ret = hidraw_report_event(hid, data, size);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
if (hid->claimed != HID_CLAIMED_HIDRAW && report->maxfield) {
|
|
for (a = 0; a < report->maxfield; a++)
|
|
hid_input_field(hid, report->field[a], cdata, interrupt);
|
|
hdrv = hid->driver;
|
|
if (hdrv && hdrv->report)
|
|
hdrv->report(hid, report);
|
|
}
|
|
|
|
if (hid->claimed & HID_CLAIMED_INPUT)
|
|
hidinput_report_event(hid, report);
|
|
out:
|
|
return ret;
|
|
}
|
|
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: distinguish between interrupt and control transfers
|
|
*
|
|
* This is data entry for lower layers.
|
|
*/
|
|
int hid_input_report(struct hid_device *hid, int type, u8 *data, u32 size, int interrupt)
|
|
{
|
|
struct hid_report_enum *report_enum;
|
|
struct hid_driver *hdrv;
|
|
struct hid_report *report;
|
|
int ret = 0;
|
|
|
|
if (!hid)
|
|
return -ENODEV;
|
|
|
|
if (down_trylock(&hid->driver_input_lock))
|
|
return -EBUSY;
|
|
|
|
if (!hid->driver) {
|
|
ret = -ENODEV;
|
|
goto unlock;
|
|
}
|
|
report_enum = hid->report_enum + type;
|
|
hdrv = hid->driver;
|
|
|
|
if (!size) {
|
|
dbg_hid("empty report\n");
|
|
ret = -1;
|
|
goto unlock;
|
|
}
|
|
|
|
/* Avoid unnecessary overhead if debugfs is disabled */
|
|
if (!list_empty(&hid->debug_list))
|
|
hid_dump_report(hid, type, data, size);
|
|
|
|
report = hid_get_report(report_enum, data);
|
|
|
|
if (!report) {
|
|
ret = -1;
|
|
goto unlock;
|
|
}
|
|
|
|
if (hdrv && hdrv->raw_event && hid_match_report(hid, report)) {
|
|
ret = hdrv->raw_event(hid, report, data, size);
|
|
if (ret < 0)
|
|
goto unlock;
|
|
}
|
|
|
|
ret = hid_report_raw_event(hid, type, data, size, interrupt);
|
|
|
|
unlock:
|
|
up(&hid->driver_input_lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_input_report);
|
|
|
|
bool hid_match_one_id(const struct hid_device *hdev,
|
|
const struct hid_device_id *id)
|
|
{
|
|
return (id->bus == HID_BUS_ANY || id->bus == hdev->bus) &&
|
|
(id->group == HID_GROUP_ANY || id->group == hdev->group) &&
|
|
(id->vendor == HID_ANY_ID || id->vendor == hdev->vendor) &&
|
|
(id->product == HID_ANY_ID || id->product == hdev->product);
|
|
}
|
|
|
|
const struct hid_device_id *hid_match_id(const 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[] = {
|
|
{ HID_USB_DEVICE(USB_VENDOR_ID_MGE, USB_DEVICE_ID_MGE_UPS) },
|
|
{ HID_USB_DEVICE(USB_VENDOR_ID_MGE, USB_DEVICE_ID_MGE_UPS1) },
|
|
{ }
|
|
};
|
|
|
|
static bool hid_hiddev(struct hid_device *hdev)
|
|
{
|
|
return !!hid_match_id(hdev, hid_hiddev_list);
|
|
}
|
|
|
|
|
|
static ssize_t
|
|
read_report_descriptor(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *attr,
|
|
char *buf, loff_t off, size_t count)
|
|
{
|
|
struct device *dev = kobj_to_dev(kobj);
|
|
struct hid_device *hdev = to_hid_device(dev);
|
|
|
|
if (off >= hdev->rsize)
|
|
return 0;
|
|
|
|
if (off + count > hdev->rsize)
|
|
count = hdev->rsize - off;
|
|
|
|
memcpy(buf, hdev->rdesc + off, count);
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t
|
|
show_country(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct hid_device *hdev = to_hid_device(dev);
|
|
|
|
return sprintf(buf, "%02x\n", hdev->country & 0xff);
|
|
}
|
|
|
|
static struct bin_attribute dev_bin_attr_report_desc = {
|
|
.attr = { .name = "report_descriptor", .mode = 0444 },
|
|
.read = read_report_descriptor,
|
|
.size = HID_MAX_DESCRIPTOR_SIZE,
|
|
};
|
|
|
|
static const struct device_attribute dev_attr_country = {
|
|
.attr = { .name = "country", .mode = 0444 },
|
|
.show = show_country,
|
|
};
|
|
|
|
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;
|
|
int ret;
|
|
|
|
if (hdev->quirks & HID_QUIRK_HIDDEV_FORCE)
|
|
connect_mask |= (HID_CONNECT_HIDDEV_FORCE | HID_CONNECT_HIDDEV);
|
|
if (hdev->quirks & HID_QUIRK_HIDINPUT_FORCE)
|
|
connect_mask |= HID_CONNECT_HIDINPUT_FORCE;
|
|
if (hdev->bus != BUS_USB)
|
|
connect_mask &= ~HID_CONNECT_HIDDEV;
|
|
if (hid_hiddev(hdev))
|
|
connect_mask |= HID_CONNECT_HIDDEV_FORCE;
|
|
|
|
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 (connect_mask & HID_CONNECT_DRIVER)
|
|
hdev->claimed |= HID_CLAIMED_DRIVER;
|
|
|
|
/* Drivers with the ->raw_event callback set are not required to connect
|
|
* to any other listener. */
|
|
if (!hdev->claimed && !hdev->driver->raw_event) {
|
|
hid_err(hdev, "device has no listeners, quitting\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 ? "," : "",
|
|
((struct hiddev *)hdev->hiddev)->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;
|
|
case BUS_I2C:
|
|
bus = "I2C";
|
|
break;
|
|
case BUS_VIRTUAL:
|
|
bus = "VIRTUAL";
|
|
break;
|
|
default:
|
|
bus = "<UNKNOWN>";
|
|
}
|
|
|
|
ret = device_create_file(&hdev->dev, &dev_attr_country);
|
|
if (ret)
|
|
hid_warn(hdev,
|
|
"can't create sysfs country code attribute err: %d\n", ret);
|
|
|
|
hid_info(hdev, "%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);
|
|
|
|
void hid_disconnect(struct hid_device *hdev)
|
|
{
|
|
device_remove_file(&hdev->dev, &dev_attr_country);
|
|
if (hdev->claimed & HID_CLAIMED_INPUT)
|
|
hidinput_disconnect(hdev);
|
|
if (hdev->claimed & HID_CLAIMED_HIDDEV)
|
|
hdev->hiddev_disconnect(hdev);
|
|
if (hdev->claimed & HID_CLAIMED_HIDRAW)
|
|
hidraw_disconnect(hdev);
|
|
hdev->claimed = 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_disconnect);
|
|
|
|
/**
|
|
* hid_hw_start - start underlying HW
|
|
* @hdev: hid device
|
|
* @connect_mask: which outputs to connect, see HID_CONNECT_*
|
|
*
|
|
* Call this in probe function *after* hid_parse. This will setup HW
|
|
* buffers and start the device (if not defeirred to device open).
|
|
* hid_hw_stop must be called if this was successful.
|
|
*/
|
|
int hid_hw_start(struct hid_device *hdev, unsigned int connect_mask)
|
|
{
|
|
int error;
|
|
|
|
error = hdev->ll_driver->start(hdev);
|
|
if (error)
|
|
return error;
|
|
|
|
if (connect_mask) {
|
|
error = hid_connect(hdev, connect_mask);
|
|
if (error) {
|
|
hdev->ll_driver->stop(hdev);
|
|
return error;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_hw_start);
|
|
|
|
/**
|
|
* hid_hw_stop - stop underlying HW
|
|
* @hdev: hid device
|
|
*
|
|
* This is usually called from remove function or from probe when something
|
|
* failed and hid_hw_start was called already.
|
|
*/
|
|
void hid_hw_stop(struct hid_device *hdev)
|
|
{
|
|
hid_disconnect(hdev);
|
|
hdev->ll_driver->stop(hdev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_hw_stop);
|
|
|
|
/**
|
|
* hid_hw_open - signal underlying HW to start delivering events
|
|
* @hdev: hid device
|
|
*
|
|
* Tell underlying HW to start delivering events from the device.
|
|
* This function should be called sometime after successful call
|
|
* to hid_hw_start().
|
|
*/
|
|
int hid_hw_open(struct hid_device *hdev)
|
|
{
|
|
int ret;
|
|
|
|
ret = mutex_lock_killable(&hdev->ll_open_lock);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!hdev->ll_open_count++) {
|
|
ret = hdev->ll_driver->open(hdev);
|
|
if (ret)
|
|
hdev->ll_open_count--;
|
|
}
|
|
|
|
mutex_unlock(&hdev->ll_open_lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_hw_open);
|
|
|
|
/**
|
|
* hid_hw_close - signal underlaying HW to stop delivering events
|
|
*
|
|
* @hdev: hid device
|
|
*
|
|
* This function indicates that we are not interested in the events
|
|
* from this device anymore. Delivery of events may or may not stop,
|
|
* depending on the number of users still outstanding.
|
|
*/
|
|
void hid_hw_close(struct hid_device *hdev)
|
|
{
|
|
mutex_lock(&hdev->ll_open_lock);
|
|
if (!--hdev->ll_open_count)
|
|
hdev->ll_driver->close(hdev);
|
|
mutex_unlock(&hdev->ll_open_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_hw_close);
|
|
|
|
/**
|
|
* hid_hw_request - send report request to device
|
|
*
|
|
* @hdev: hid device
|
|
* @report: report to send
|
|
* @reqtype: hid request type
|
|
*/
|
|
void hid_hw_request(struct hid_device *hdev,
|
|
struct hid_report *report, int reqtype)
|
|
{
|
|
if (hdev->ll_driver->request)
|
|
return hdev->ll_driver->request(hdev, report, reqtype);
|
|
|
|
__hid_request(hdev, report, reqtype);
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_hw_request);
|
|
|
|
/**
|
|
* hid_hw_raw_request - send report request to device
|
|
*
|
|
* @hdev: hid device
|
|
* @reportnum: report ID
|
|
* @buf: in/out data to transfer
|
|
* @len: length of buf
|
|
* @rtype: HID report type
|
|
* @reqtype: HID_REQ_GET_REPORT or HID_REQ_SET_REPORT
|
|
*
|
|
* Return: count of data transferred, negative if error
|
|
*
|
|
* Same behavior as hid_hw_request, but with raw buffers instead.
|
|
*/
|
|
int hid_hw_raw_request(struct hid_device *hdev,
|
|
unsigned char reportnum, __u8 *buf,
|
|
size_t len, unsigned char rtype, int reqtype)
|
|
{
|
|
if (len < 1 || len > HID_MAX_BUFFER_SIZE || !buf)
|
|
return -EINVAL;
|
|
|
|
return hdev->ll_driver->raw_request(hdev, reportnum, buf, len,
|
|
rtype, reqtype);
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_hw_raw_request);
|
|
|
|
/**
|
|
* hid_hw_output_report - send output report to device
|
|
*
|
|
* @hdev: hid device
|
|
* @buf: raw data to transfer
|
|
* @len: length of buf
|
|
*
|
|
* Return: count of data transferred, negative if error
|
|
*/
|
|
int hid_hw_output_report(struct hid_device *hdev, __u8 *buf, size_t len)
|
|
{
|
|
if (len < 1 || len > HID_MAX_BUFFER_SIZE || !buf)
|
|
return -EINVAL;
|
|
|
|
if (hdev->ll_driver->output_report)
|
|
return hdev->ll_driver->output_report(hdev, buf, len);
|
|
|
|
return -ENOSYS;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_hw_output_report);
|
|
|
|
#ifdef CONFIG_PM
|
|
int hid_driver_suspend(struct hid_device *hdev, pm_message_t state)
|
|
{
|
|
if (hdev->driver && hdev->driver->suspend)
|
|
return hdev->driver->suspend(hdev, state);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_driver_suspend);
|
|
|
|
int hid_driver_reset_resume(struct hid_device *hdev)
|
|
{
|
|
if (hdev->driver && hdev->driver->reset_resume)
|
|
return hdev->driver->reset_resume(hdev);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_driver_reset_resume);
|
|
|
|
int hid_driver_resume(struct hid_device *hdev)
|
|
{
|
|
if (hdev->driver && hdev->driver->resume)
|
|
return hdev->driver->resume(hdev);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_driver_resume);
|
|
#endif /* CONFIG_PM */
|
|
|
|
struct hid_dynid {
|
|
struct list_head list;
|
|
struct hid_device_id id;
|
|
};
|
|
|
|
/**
|
|
* new_id_store - add a new HID device ID to this driver and re-probe devices
|
|
* @drv: target device driver
|
|
* @buf: buffer for scanning device ID data
|
|
* @count: input size
|
|
*
|
|
* Adds a new dynamic hid device ID to this driver,
|
|
* and causes the driver to probe for all devices again.
|
|
*/
|
|
static ssize_t new_id_store(struct device_driver *drv, const char *buf,
|
|
size_t count)
|
|
{
|
|
struct hid_driver *hdrv = to_hid_driver(drv);
|
|
struct hid_dynid *dynid;
|
|
__u32 bus, vendor, product;
|
|
unsigned long driver_data = 0;
|
|
int ret;
|
|
|
|
ret = sscanf(buf, "%x %x %x %lx",
|
|
&bus, &vendor, &product, &driver_data);
|
|
if (ret < 3)
|
|
return -EINVAL;
|
|
|
|
dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
|
|
if (!dynid)
|
|
return -ENOMEM;
|
|
|
|
dynid->id.bus = bus;
|
|
dynid->id.group = HID_GROUP_ANY;
|
|
dynid->id.vendor = vendor;
|
|
dynid->id.product = product;
|
|
dynid->id.driver_data = driver_data;
|
|
|
|
spin_lock(&hdrv->dyn_lock);
|
|
list_add_tail(&dynid->list, &hdrv->dyn_list);
|
|
spin_unlock(&hdrv->dyn_lock);
|
|
|
|
ret = driver_attach(&hdrv->driver);
|
|
|
|
return ret ? : count;
|
|
}
|
|
static DRIVER_ATTR_WO(new_id);
|
|
|
|
static struct attribute *hid_drv_attrs[] = {
|
|
&driver_attr_new_id.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(hid_drv);
|
|
|
|
static void hid_free_dynids(struct hid_driver *hdrv)
|
|
{
|
|
struct hid_dynid *dynid, *n;
|
|
|
|
spin_lock(&hdrv->dyn_lock);
|
|
list_for_each_entry_safe(dynid, n, &hdrv->dyn_list, list) {
|
|
list_del(&dynid->list);
|
|
kfree(dynid);
|
|
}
|
|
spin_unlock(&hdrv->dyn_lock);
|
|
}
|
|
|
|
const struct hid_device_id *hid_match_device(struct hid_device *hdev,
|
|
struct hid_driver *hdrv)
|
|
{
|
|
struct hid_dynid *dynid;
|
|
|
|
spin_lock(&hdrv->dyn_lock);
|
|
list_for_each_entry(dynid, &hdrv->dyn_list, list) {
|
|
if (hid_match_one_id(hdev, &dynid->id)) {
|
|
spin_unlock(&hdrv->dyn_lock);
|
|
return &dynid->id;
|
|
}
|
|
}
|
|
spin_unlock(&hdrv->dyn_lock);
|
|
|
|
return hid_match_id(hdev, hdrv->id_table);
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_match_device);
|
|
|
|
static int hid_bus_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
struct hid_driver *hdrv = to_hid_driver(drv);
|
|
struct hid_device *hdev = to_hid_device(dev);
|
|
|
|
return hid_match_device(hdev, hdrv) != NULL;
|
|
}
|
|
|
|
/**
|
|
* hid_compare_device_paths - check if both devices share the same path
|
|
* @hdev_a: hid device
|
|
* @hdev_b: hid device
|
|
* @separator: char to use as separator
|
|
*
|
|
* Check if two devices share the same path up to the last occurrence of
|
|
* the separator char. Both paths must exist (i.e., zero-length paths
|
|
* don't match).
|
|
*/
|
|
bool hid_compare_device_paths(struct hid_device *hdev_a,
|
|
struct hid_device *hdev_b, char separator)
|
|
{
|
|
int n1 = strrchr(hdev_a->phys, separator) - hdev_a->phys;
|
|
int n2 = strrchr(hdev_b->phys, separator) - hdev_b->phys;
|
|
|
|
if (n1 != n2 || n1 <= 0 || n2 <= 0)
|
|
return false;
|
|
|
|
return !strncmp(hdev_a->phys, hdev_b->phys, n1);
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_compare_device_paths);
|
|
|
|
static int hid_device_probe(struct device *dev)
|
|
{
|
|
struct hid_driver *hdrv = to_hid_driver(dev->driver);
|
|
struct hid_device *hdev = to_hid_device(dev);
|
|
const struct hid_device_id *id;
|
|
int ret = 0;
|
|
|
|
if (down_interruptible(&hdev->driver_input_lock)) {
|
|
ret = -EINTR;
|
|
goto end;
|
|
}
|
|
hdev->io_started = false;
|
|
|
|
clear_bit(ffs(HID_STAT_REPROBED), &hdev->status);
|
|
|
|
if (!hdev->driver) {
|
|
id = hid_match_device(hdev, hdrv);
|
|
if (id == NULL) {
|
|
ret = -ENODEV;
|
|
goto unlock;
|
|
}
|
|
|
|
if (hdrv->match) {
|
|
if (!hdrv->match(hdev, hid_ignore_special_drivers)) {
|
|
ret = -ENODEV;
|
|
goto unlock;
|
|
}
|
|
} else {
|
|
/*
|
|
* hid-generic implements .match(), so if
|
|
* hid_ignore_special_drivers is set, we can safely
|
|
* return.
|
|
*/
|
|
if (hid_ignore_special_drivers) {
|
|
ret = -ENODEV;
|
|
goto unlock;
|
|
}
|
|
}
|
|
|
|
/* reset the quirks that has been previously set */
|
|
hdev->quirks = hid_lookup_quirk(hdev);
|
|
hdev->driver = hdrv;
|
|
if (hdrv->probe) {
|
|
ret = hdrv->probe(hdev, id);
|
|
} else { /* default probe */
|
|
ret = hid_open_report(hdev);
|
|
if (!ret)
|
|
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
|
|
}
|
|
if (ret) {
|
|
hid_close_report(hdev);
|
|
hdev->driver = NULL;
|
|
}
|
|
}
|
|
unlock:
|
|
if (!hdev->io_started)
|
|
up(&hdev->driver_input_lock);
|
|
end:
|
|
return ret;
|
|
}
|
|
|
|
static void hid_device_remove(struct device *dev)
|
|
{
|
|
struct hid_device *hdev = to_hid_device(dev);
|
|
struct hid_driver *hdrv;
|
|
|
|
down(&hdev->driver_input_lock);
|
|
hdev->io_started = false;
|
|
|
|
hdrv = hdev->driver;
|
|
if (hdrv) {
|
|
if (hdrv->remove)
|
|
hdrv->remove(hdev);
|
|
else /* default remove */
|
|
hid_hw_stop(hdev);
|
|
hid_close_report(hdev);
|
|
hdev->driver = NULL;
|
|
}
|
|
|
|
if (!hdev->io_started)
|
|
up(&hdev->driver_input_lock);
|
|
}
|
|
|
|
static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct hid_device *hdev = container_of(dev, struct hid_device, dev);
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "hid:b%04Xg%04Xv%08Xp%08X\n",
|
|
hdev->bus, hdev->group, hdev->vendor, hdev->product);
|
|
}
|
|
static DEVICE_ATTR_RO(modalias);
|
|
|
|
static struct attribute *hid_dev_attrs[] = {
|
|
&dev_attr_modalias.attr,
|
|
NULL,
|
|
};
|
|
static struct bin_attribute *hid_dev_bin_attrs[] = {
|
|
&dev_bin_attr_report_desc,
|
|
NULL
|
|
};
|
|
static const struct attribute_group hid_dev_group = {
|
|
.attrs = hid_dev_attrs,
|
|
.bin_attrs = hid_dev_bin_attrs,
|
|
};
|
|
__ATTRIBUTE_GROUPS(hid_dev);
|
|
|
|
static int hid_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct hid_device *hdev = to_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%04Xg%04Xv%08Xp%08X",
|
|
hdev->bus, hdev->group, hdev->vendor, hdev->product))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct bus_type hid_bus_type = {
|
|
.name = "hid",
|
|
.dev_groups = hid_dev_groups,
|
|
.drv_groups = hid_drv_groups,
|
|
.match = hid_bus_match,
|
|
.probe = hid_device_probe,
|
|
.remove = hid_device_remove,
|
|
.uevent = hid_uevent,
|
|
};
|
|
EXPORT_SYMBOL(hid_bus_type);
|
|
|
|
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;
|
|
|
|
hdev->quirks = hid_lookup_quirk(hdev);
|
|
|
|
/* we need to kill them here, otherwise they will stay allocated to
|
|
* wait for coming driver */
|
|
if (hid_ignore(hdev))
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* Check for the mandatory transport channel.
|
|
*/
|
|
if (!hdev->ll_driver->raw_request) {
|
|
hid_err(hdev, "transport driver missing .raw_request()\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Read the device report descriptor once and use as template
|
|
* for the driver-specific modifications.
|
|
*/
|
|
ret = hdev->ll_driver->parse(hdev);
|
|
if (ret)
|
|
return ret;
|
|
if (!hdev->dev_rdesc)
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* Scan generic devices for group information
|
|
*/
|
|
if (hid_ignore_special_drivers) {
|
|
hdev->group = HID_GROUP_GENERIC;
|
|
} else if (!hdev->group &&
|
|
!(hdev->quirks & HID_QUIRK_HAVE_SPECIAL_DRIVER)) {
|
|
ret = hid_scan_report(hdev);
|
|
if (ret)
|
|
hid_warn(hdev, "bad device descriptor (%d)\n", ret);
|
|
}
|
|
|
|
/* XXX hack, any other cleaner solution after the driver core
|
|
* is converted to allow more than 20 bytes as the device name? */
|
|
dev_set_name(&hdev->dev, "%04X:%04X:%04X.%04X", hdev->bus,
|
|
hdev->vendor, hdev->product, atomic_inc_return(&id));
|
|
|
|
hid_debug_register(hdev, dev_name(&hdev->dev));
|
|
ret = device_add(&hdev->dev);
|
|
if (!ret)
|
|
hdev->status |= HID_STAT_ADDED;
|
|
else
|
|
hid_debug_unregister(hdev);
|
|
|
|
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;
|
|
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;
|
|
device_enable_async_suspend(&hdev->dev);
|
|
|
|
hid_close_report(hdev);
|
|
|
|
init_waitqueue_head(&hdev->debug_wait);
|
|
INIT_LIST_HEAD(&hdev->debug_list);
|
|
spin_lock_init(&hdev->debug_list_lock);
|
|
sema_init(&hdev->driver_input_lock, 1);
|
|
mutex_init(&hdev->ll_open_lock);
|
|
|
|
return hdev;
|
|
}
|
|
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);
|
|
hid_debug_unregister(hdev);
|
|
hdev->status &= ~HID_STAT_ADDED;
|
|
}
|
|
kfree(hdev->dev_rdesc);
|
|
hdev->dev_rdesc = NULL;
|
|
hdev->dev_rsize = 0;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
|
|
|
|
static int __hid_bus_reprobe_drivers(struct device *dev, void *data)
|
|
{
|
|
struct hid_driver *hdrv = data;
|
|
struct hid_device *hdev = to_hid_device(dev);
|
|
|
|
if (hdev->driver == hdrv &&
|
|
!hdrv->match(hdev, hid_ignore_special_drivers) &&
|
|
!test_and_set_bit(ffs(HID_STAT_REPROBED), &hdev->status))
|
|
return device_reprobe(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __hid_bus_driver_added(struct device_driver *drv, void *data)
|
|
{
|
|
struct hid_driver *hdrv = to_hid_driver(drv);
|
|
|
|
if (hdrv->match) {
|
|
bus_for_each_dev(&hid_bus_type, NULL, hdrv,
|
|
__hid_bus_reprobe_drivers);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __bus_removed_driver(struct device_driver *drv, void *data)
|
|
{
|
|
return bus_rescan_devices(&hid_bus_type);
|
|
}
|
|
|
|
int __hid_register_driver(struct hid_driver *hdrv, struct module *owner,
|
|
const char *mod_name)
|
|
{
|
|
int ret;
|
|
|
|
hdrv->driver.name = hdrv->name;
|
|
hdrv->driver.bus = &hid_bus_type;
|
|
hdrv->driver.owner = owner;
|
|
hdrv->driver.mod_name = mod_name;
|
|
|
|
INIT_LIST_HEAD(&hdrv->dyn_list);
|
|
spin_lock_init(&hdrv->dyn_lock);
|
|
|
|
ret = driver_register(&hdrv->driver);
|
|
|
|
if (ret == 0)
|
|
bus_for_each_drv(&hid_bus_type, NULL, NULL,
|
|
__hid_bus_driver_added);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__hid_register_driver);
|
|
|
|
void hid_unregister_driver(struct hid_driver *hdrv)
|
|
{
|
|
driver_unregister(&hdrv->driver);
|
|
hid_free_dynids(hdrv);
|
|
|
|
bus_for_each_drv(&hid_bus_type, NULL, hdrv, __bus_removed_driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_unregister_driver);
|
|
|
|
int hid_check_keys_pressed(struct hid_device *hid)
|
|
{
|
|
struct hid_input *hidinput;
|
|
int i;
|
|
|
|
if (!(hid->claimed & HID_CLAIMED_INPUT))
|
|
return 0;
|
|
|
|
list_for_each_entry(hidinput, &hid->inputs, list) {
|
|
for (i = 0; i < BITS_TO_LONGS(KEY_MAX); i++)
|
|
if (hidinput->input->key[i])
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hid_check_keys_pressed);
|
|
|
|
static int __init hid_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (hid_debug)
|
|
pr_warn("hid_debug is now used solely for parser and driver debugging.\n"
|
|
"debugfs is now used for inspecting the device (report descriptor, reports)\n");
|
|
|
|
ret = bus_register(&hid_bus_type);
|
|
if (ret) {
|
|
pr_err("can't register hid bus\n");
|
|
goto err;
|
|
}
|
|
|
|
ret = hidraw_init();
|
|
if (ret)
|
|
goto err_bus;
|
|
|
|
hid_debug_init();
|
|
|
|
return 0;
|
|
err_bus:
|
|
bus_unregister(&hid_bus_type);
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit hid_exit(void)
|
|
{
|
|
hid_debug_exit();
|
|
hidraw_exit();
|
|
bus_unregister(&hid_bus_type);
|
|
hid_quirks_exit(HID_BUS_ANY);
|
|
}
|
|
|
|
module_init(hid_init);
|
|
module_exit(hid_exit);
|
|
|
|
MODULE_AUTHOR("Andreas Gal");
|
|
MODULE_AUTHOR("Vojtech Pavlik");
|
|
MODULE_AUTHOR("Jiri Kosina");
|
|
MODULE_LICENSE("GPL");
|