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NetBSD/sys/dev/usb/hid.c

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/* $NetBSD: hid.c,v 1.36 2015/02/08 23:43:14 jmcneill 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 1.36 2015/02/08 23:43:14 jmcneill Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <dev/usb/usb.h>
#include <dev/usb/usbhid.h>
#include <dev/usb/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 = malloc(sizeof *s, M_TEMP, M_WAITOK|M_ZERO);
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;
free(s->cur.next, M_TEMP);
s->cur.next = hi;
}
free(s, M_TEMP);
}
int
hid_get_item(struct hid_data *s, struct hid_item *h)
{
struct hid_item *c = &s->cur;
unsigned int bTag, bType, bSize;
u_int32_t oldpos;
const u_char *data;
int32_t dval;
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[min(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;
break;
case 1:
dval = /*(int8_t)*/ *data++;
break;
case 2:
dval = *data++;
dval |= *data++ << 8;
break;
case 4:
dval = *data++;
dval |= *data++ << 8;
dval |= *data++ << 16;
dval |= *data++ << 24;
break;
default:
printf("BAD LENGTH %d\n", bSize);
continue;
}
DPRINTFN(5,("hid_get_item: bType=%d bTag=%d dval=%d\n",
bType, bTag, dval));
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 = dval;
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 {
c->usage = c->_usage_page; /* XXX */
*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 = dval;
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:
printf("Main bTag=%d\n", bTag);
break;
}
break;
case 1: /* Global */
switch (bTag) {
case 0:
c->_usage_page = dval << 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 = dval;
break;
case 6:
c->unit = dval;
break;
case 7:
c->loc.size = dval;
break;
case 8:
c->report_ID = dval;
c->loc.pos = 0;
break;
case 9:
c->loc.count = dval;
break;
case 10: /* Push */
hi = malloc(sizeof *hi, M_TEMP, M_WAITOK);
*hi = *c;
c->next = hi;
break;
case 11: /* Pop */
hi = c->next;
oldpos = c->loc.pos;
*c = *hi;
c->loc.pos = oldpos;
free(hi, M_TEMP);
break;
default:
printf("Global bTag=%d\n", bTag);
break;
}
break;
case 2: /* Local */
switch (bTag) {
case 0:
if (bSize == 1)
dval = c->_usage_page | (dval&0xff);
else if (bSize == 2)
dval = c->_usage_page | (dval&0xffff);
c->usage = dval;
if (s->nu < MAXUSAGE)
s->usages[s->nu++] = dval;
/* else XXX */
break;
case 1:
s->minset = 1;
if (bSize == 1)
dval = c->_usage_page | (dval&0xff);
else if (bSize == 2)
dval = c->_usage_page | (dval&0xffff);
c->usage_minimum = dval;
break;
case 2:
if (bSize == 1)
dval = c->_usage_page | (dval&0xff);
else if (bSize == 2)
dval = c->_usage_page | (dval&0xffff);
c->usage_maximum = dval;
break;
case 3:
c->designator_index = dval;
break;
case 4:
c->designator_minimum = dval;
break;
case 5:
c->designator_maximum = dval;
break;
case 7:
c->string_index = dval;
break;
case 8:
c->string_minimum = dval;
break;
case 9:
c->string_maximum = dval;
break;
case 10:
c->set_delimiter = dval;
break;
default:
printf("Local bTag=%d\n", bTag);
break;
}
break;
default:
printf("default bType=%d\n", bType);
break;
}
}
}
int
hid_report_size(const void *buf, int len, enum hid_kind k, u_int8_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) {
printf("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, u_int32_t u, u_int8_t id, enum hid_kind k,
struct hid_location *loc, u_int32_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);
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 < (1 << (hsize - 1)))
return (data);
return data - (1 << 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 |= buf[off + i] << (i * 8);
data >>= hpos % 8;
data &= (1 << 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, u_int8_t id, u_int32_t usage)
{
struct hid_data *hd;
struct hid_item hi;
u_int32_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);
}
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