534 lines
12 KiB
C
534 lines
12 KiB
C
/* $NetBSD: hid.c,v 1.3 2018/11/15 23:01:45 jakllsch Exp $ */
|
|
/* $FreeBSD: src/sys/dev/usb/hid.c,v 1.11 1999/11/17 22:33:39 n_hibma Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1998 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Lennart Augustsson (lennart@augustsson.net) at
|
|
* Carlstedt Research & Technology.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: hid.c,v 1.3 2018/11/15 23:01:45 jakllsch Exp $");
|
|
|
|
#ifdef _KERNEL_OPT
|
|
#include "opt_usb.h"
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/kmem.h>
|
|
|
|
#include <dev/usb/usb.h>
|
|
#include <dev/usb/usbhid.h>
|
|
|
|
#include <dev/hid/hid.h>
|
|
|
|
#ifdef UHIDEV_DEBUG
|
|
#define DPRINTF(x) if (uhidevdebug) printf x
|
|
#define DPRINTFN(n,x) if (uhidevdebug>(n)) printf x
|
|
extern int uhidevdebug;
|
|
#else
|
|
#define DPRINTF(x)
|
|
#define DPRINTFN(n,x)
|
|
#endif
|
|
|
|
Static void hid_clear_local(struct hid_item *);
|
|
|
|
#define MAXUSAGE 256
|
|
struct hid_data {
|
|
const u_char *start;
|
|
const u_char *end;
|
|
const u_char *p;
|
|
struct hid_item cur;
|
|
int32_t usages[MAXUSAGE];
|
|
int nu;
|
|
int minset;
|
|
int multi;
|
|
int multimax;
|
|
enum hid_kind kind;
|
|
};
|
|
|
|
Static void
|
|
hid_clear_local(struct hid_item *c)
|
|
{
|
|
|
|
DPRINTFN(5,("hid_clear_local\n"));
|
|
c->usage = 0;
|
|
c->usage_minimum = 0;
|
|
c->usage_maximum = 0;
|
|
c->designator_index = 0;
|
|
c->designator_minimum = 0;
|
|
c->designator_maximum = 0;
|
|
c->string_index = 0;
|
|
c->string_minimum = 0;
|
|
c->string_maximum = 0;
|
|
c->set_delimiter = 0;
|
|
}
|
|
|
|
struct hid_data *
|
|
hid_start_parse(const void *d, int len, enum hid_kind kind)
|
|
{
|
|
struct hid_data *s;
|
|
|
|
s = kmem_zalloc(sizeof(*s), KM_SLEEP);
|
|
s->start = s->p = d;
|
|
s->end = (const char *)d + len;
|
|
s->kind = kind;
|
|
return s;
|
|
}
|
|
|
|
void
|
|
hid_end_parse(struct hid_data *s)
|
|
{
|
|
|
|
while (s->cur.next != NULL) {
|
|
struct hid_item *hi = s->cur.next->next;
|
|
kmem_free(s->cur.next, sizeof(*s->cur.next));
|
|
s->cur.next = hi;
|
|
}
|
|
kmem_free(s, sizeof(*s));
|
|
}
|
|
|
|
int
|
|
hid_get_item(struct hid_data *s, struct hid_item *h)
|
|
{
|
|
struct hid_item *c = &s->cur;
|
|
unsigned int bTag, bType, bSize;
|
|
uint32_t oldpos;
|
|
const u_char *data;
|
|
int32_t dval;
|
|
uint32_t uval;
|
|
const u_char *p;
|
|
struct hid_item *hi;
|
|
int i;
|
|
enum hid_kind retkind;
|
|
|
|
top:
|
|
DPRINTFN(5,("hid_get_item: multi=%d multimax=%d\n",
|
|
s->multi, s->multimax));
|
|
if (s->multimax != 0) {
|
|
if (s->multi < s->multimax) {
|
|
c->usage = s->usages[uimin(s->multi, s->nu-1)];
|
|
s->multi++;
|
|
*h = *c;
|
|
c->loc.pos += c->loc.size;
|
|
h->next = NULL;
|
|
DPRINTFN(5,("return multi\n"));
|
|
return 1;
|
|
} else {
|
|
c->loc.count = s->multimax;
|
|
s->multimax = 0;
|
|
s->nu = 0;
|
|
hid_clear_local(c);
|
|
}
|
|
}
|
|
for (;;) {
|
|
p = s->p;
|
|
if (p >= s->end)
|
|
return 0;
|
|
|
|
bSize = *p++;
|
|
if (bSize == 0xfe) {
|
|
/* long item */
|
|
bSize = *p++;
|
|
bSize |= *p++ << 8;
|
|
bTag = *p++;
|
|
data = p;
|
|
p += bSize;
|
|
bType = 0xff; /* XXX what should it be */
|
|
} else {
|
|
/* short item */
|
|
bTag = bSize >> 4;
|
|
bType = (bSize >> 2) & 3;
|
|
bSize &= 3;
|
|
if (bSize == 3) bSize = 4;
|
|
data = p;
|
|
p += bSize;
|
|
}
|
|
s->p = p;
|
|
switch(bSize) {
|
|
case 0:
|
|
dval = 0;
|
|
uval = dval;
|
|
break;
|
|
case 1:
|
|
dval = *data++;
|
|
uval = dval;
|
|
dval = (int8_t)dval;
|
|
break;
|
|
case 2:
|
|
dval = *data++;
|
|
dval |= *data++ << 8;
|
|
uval = dval;
|
|
dval = (int16_t)dval;
|
|
break;
|
|
case 4:
|
|
dval = *data++;
|
|
dval |= *data++ << 8;
|
|
dval |= *data++ << 16;
|
|
dval |= *data++ << 24;
|
|
uval = dval;
|
|
dval = (int32_t)dval;
|
|
break;
|
|
default:
|
|
aprint_normal("BAD LENGTH %d\n", bSize);
|
|
continue;
|
|
}
|
|
|
|
DPRINTFN(5,("hid_get_item: bType=%d bTag=%d dval=%d uval=%u\n",
|
|
bType, bTag, dval, uval));
|
|
switch (bType) {
|
|
case 0: /* Main */
|
|
switch (bTag) {
|
|
case 8: /* Input */
|
|
retkind = hid_input;
|
|
ret:
|
|
if (s->kind != retkind) {
|
|
s->minset = 0;
|
|
s->nu = 0;
|
|
hid_clear_local(c);
|
|
continue;
|
|
}
|
|
c->kind = retkind;
|
|
c->flags = uval;
|
|
if (c->flags & HIO_VARIABLE) {
|
|
s->multimax = c->loc.count;
|
|
s->multi = 0;
|
|
c->loc.count = 1;
|
|
if (s->minset) {
|
|
for (i = c->usage_minimum;
|
|
i <= c->usage_maximum;
|
|
i++) {
|
|
s->usages[s->nu] = i;
|
|
if (s->nu < MAXUSAGE-1)
|
|
s->nu++;
|
|
}
|
|
s->minset = 0;
|
|
}
|
|
goto top;
|
|
} else {
|
|
if (s->minset)
|
|
c->usage = c->usage_minimum;
|
|
*h = *c;
|
|
h->next = NULL;
|
|
c->loc.pos +=
|
|
c->loc.size * c->loc.count;
|
|
s->minset = 0;
|
|
s->nu = 0;
|
|
hid_clear_local(c);
|
|
return 1;
|
|
}
|
|
case 9: /* Output */
|
|
retkind = hid_output;
|
|
goto ret;
|
|
case 10: /* Collection */
|
|
c->kind = hid_collection;
|
|
c->collection = uval;
|
|
c->collevel++;
|
|
*h = *c;
|
|
hid_clear_local(c);
|
|
s->nu = 0;
|
|
return 1;
|
|
case 11: /* Feature */
|
|
retkind = hid_feature;
|
|
goto ret;
|
|
case 12: /* End collection */
|
|
c->kind = hid_endcollection;
|
|
c->collevel--;
|
|
*h = *c;
|
|
s->nu = 0;
|
|
return 1;
|
|
default:
|
|
aprint_normal("Main bTag=%d\n", bTag);
|
|
break;
|
|
}
|
|
break;
|
|
case 1: /* Global */
|
|
switch (bTag) {
|
|
case 0:
|
|
c->_usage_page = uval << 16;
|
|
break;
|
|
case 1:
|
|
c->logical_minimum = dval;
|
|
break;
|
|
case 2:
|
|
c->logical_maximum = dval;
|
|
break;
|
|
case 3:
|
|
c->physical_minimum = dval;
|
|
break;
|
|
case 4:
|
|
c->physical_maximum = dval;
|
|
break;
|
|
case 5:
|
|
c->unit_exponent = uval;
|
|
break;
|
|
case 6:
|
|
c->unit = uval;
|
|
break;
|
|
case 7:
|
|
c->loc.size = uval;
|
|
break;
|
|
case 8:
|
|
c->report_ID = uval;
|
|
c->loc.pos = 0;
|
|
break;
|
|
case 9:
|
|
c->loc.count = uval;
|
|
break;
|
|
case 10: /* Push */
|
|
hi = kmem_alloc(sizeof(*hi), KM_SLEEP);
|
|
*hi = *c;
|
|
c->next = hi;
|
|
break;
|
|
case 11: /* Pop */
|
|
hi = c->next;
|
|
if (hi == NULL)
|
|
break;
|
|
oldpos = c->loc.pos;
|
|
*c = *hi;
|
|
c->loc.pos = oldpos;
|
|
kmem_free(hi, sizeof(*hi));
|
|
break;
|
|
default:
|
|
aprint_normal("Global bTag=%d\n", bTag);
|
|
break;
|
|
}
|
|
break;
|
|
case 2: /* Local */
|
|
switch (bTag) {
|
|
case 0:
|
|
if (bSize < 4)
|
|
uval = c->_usage_page | uval;
|
|
c->usage = uval;
|
|
if (s->nu < MAXUSAGE)
|
|
s->usages[s->nu++] = uval;
|
|
/* else XXX */
|
|
break;
|
|
case 1:
|
|
s->minset = 1;
|
|
if (bSize < 4)
|
|
uval = c->_usage_page | uval;
|
|
c->usage_minimum = uval;
|
|
break;
|
|
case 2:
|
|
if (bSize < 4)
|
|
uval = c->_usage_page | uval;
|
|
c->usage_maximum = uval;
|
|
break;
|
|
case 3:
|
|
c->designator_index = uval;
|
|
break;
|
|
case 4:
|
|
c->designator_minimum = uval;
|
|
break;
|
|
case 5:
|
|
c->designator_maximum = uval;
|
|
break;
|
|
case 7:
|
|
c->string_index = uval;
|
|
break;
|
|
case 8:
|
|
c->string_minimum = uval;
|
|
break;
|
|
case 9:
|
|
c->string_maximum = uval;
|
|
break;
|
|
case 10:
|
|
c->set_delimiter = uval;
|
|
break;
|
|
default:
|
|
aprint_normal("Local bTag=%d\n", bTag);
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
aprint_normal("default bType=%d\n", bType);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
hid_report_size(const void *buf, int len, enum hid_kind k, uint8_t id)
|
|
{
|
|
struct hid_data *d;
|
|
struct hid_item h;
|
|
int lo, hi;
|
|
|
|
h.report_ID = 0;
|
|
lo = hi = -1;
|
|
DPRINTFN(2,("hid_report_size: kind=%d id=%d\n", k, id));
|
|
for (d = hid_start_parse(buf, len, k); hid_get_item(d, &h); ) {
|
|
DPRINTFN(2,("hid_report_size: item kind=%d id=%d pos=%d "
|
|
"size=%d count=%d\n",
|
|
h.kind, h.report_ID, h.loc.pos, h.loc.size,
|
|
h.loc.count));
|
|
if (h.report_ID == id && h.kind == k) {
|
|
if (lo < 0) {
|
|
lo = h.loc.pos;
|
|
#ifdef DIAGNOSTIC
|
|
if (lo != 0) {
|
|
aprint_normal("hid_report_size:"
|
|
" lo != 0\n");
|
|
}
|
|
#endif
|
|
}
|
|
hi = h.loc.pos + h.loc.size * h.loc.count;
|
|
DPRINTFN(2,("hid_report_size: lo=%d hi=%d\n", lo, hi));
|
|
}
|
|
}
|
|
hid_end_parse(d);
|
|
return (hi - lo + 7) / 8;
|
|
}
|
|
|
|
int
|
|
hid_locate(const void *desc, int size, uint32_t u, uint8_t id, enum hid_kind k,
|
|
struct hid_location *loc, uint32_t *flags)
|
|
{
|
|
struct hid_data *d;
|
|
struct hid_item h;
|
|
|
|
h.report_ID = 0;
|
|
DPRINTFN(5,("hid_locate: enter usage=0x%x kind=%d id=%d\n", u, k, id));
|
|
for (d = hid_start_parse(desc, size, k); hid_get_item(d, &h); ) {
|
|
DPRINTFN(5,("hid_locate: usage=0x%x kind=%d id=%d flags=0x%x\n",
|
|
h.usage, h.kind, h.report_ID, h.flags));
|
|
if (h.kind == k && !(h.flags & HIO_CONST) &&
|
|
h.usage == u && h.report_ID == id) {
|
|
if (loc != NULL)
|
|
*loc = h.loc;
|
|
if (flags != NULL)
|
|
*flags = h.flags;
|
|
hid_end_parse(d);
|
|
return 1;
|
|
}
|
|
}
|
|
hid_end_parse(d);
|
|
if (loc != NULL)
|
|
loc->size = 0;
|
|
return 0;
|
|
}
|
|
|
|
long
|
|
hid_get_data(const u_char *buf, const struct hid_location *loc)
|
|
{
|
|
u_int hsize = loc->size;
|
|
u_long data;
|
|
|
|
if (hsize == 0)
|
|
return 0;
|
|
|
|
data = hid_get_udata(buf, loc);
|
|
if (data < (1UL << (hsize - 1)) || hsize == sizeof(data) * NBBY)
|
|
return data;
|
|
return data - (1UL << hsize);
|
|
}
|
|
|
|
u_long
|
|
hid_get_udata(const u_char *buf, const struct hid_location *loc)
|
|
{
|
|
u_int hpos = loc->pos;
|
|
u_int hsize = loc->size;
|
|
u_int i, num, off;
|
|
u_long data;
|
|
|
|
if (hsize == 0)
|
|
return 0;
|
|
|
|
data = 0;
|
|
off = hpos / 8;
|
|
num = (hpos + hsize + 7) / 8 - off;
|
|
|
|
for (i = 0; i < num; i++)
|
|
data |= (unsigned long)buf[off + i] << (i * 8);
|
|
|
|
data >>= hpos % 8;
|
|
if (hsize < sizeof(data) * NBBY)
|
|
data &= (1UL << hsize) - 1;
|
|
|
|
DPRINTFN(10,("hid_get_udata: loc %d/%d = %lu\n", hpos, hsize, data));
|
|
return data;
|
|
}
|
|
|
|
/*
|
|
* hid_is_collection(desc, size, id, usage)
|
|
*
|
|
* This function is broken in the following way.
|
|
*
|
|
* It is used to discover if the given 'id' is part of 'usage' collection
|
|
* in the descriptor in order to match report id against device type.
|
|
*
|
|
* The semantics of hid_start_parse() means though, that only a single
|
|
* kind of report is considered. The current HID code that uses this for
|
|
* matching is actually only looking for input reports, so this works
|
|
* for now.
|
|
*
|
|
* This function could try all report kinds (input, output and feature)
|
|
* consecutively if necessary, but it may be better to integrate the
|
|
* libusbhid code which can consider multiple report kinds simultaneously
|
|
*
|
|
* Needs some thought.
|
|
*/
|
|
int
|
|
hid_is_collection(const void *desc, int size, uint8_t id, uint32_t usage)
|
|
{
|
|
struct hid_data *hd;
|
|
struct hid_item hi;
|
|
uint32_t coll_usage = ~0;
|
|
|
|
hd = hid_start_parse(desc, size, hid_input);
|
|
if (hd == NULL)
|
|
return 0;
|
|
|
|
DPRINTFN(2,("hid_is_collection: id=%d usage=0x%x\n", id, usage));
|
|
while (hid_get_item(hd, &hi)) {
|
|
DPRINTFN(2,("hid_is_collection: kind=%d id=%d usage=0x%x"
|
|
"(0x%x)\n",
|
|
hi.kind, hi.report_ID, hi.usage, coll_usage));
|
|
|
|
if (hi.kind == hid_collection &&
|
|
hi.collection == HCOLL_APPLICATION)
|
|
coll_usage = hi.usage;
|
|
|
|
if (hi.kind == hid_endcollection)
|
|
coll_usage = ~0;
|
|
|
|
if (hi.kind == hid_input &&
|
|
coll_usage == usage &&
|
|
hi.report_ID == id) {
|
|
DPRINTFN(2,("hid_is_collection: found\n"));
|
|
hid_end_parse(hd);
|
|
return 1;
|
|
}
|
|
}
|
|
DPRINTFN(2,("hid_is_collection: not found\n"));
|
|
hid_end_parse(hd);
|
|
return 0;
|
|
}
|