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freebsd-dev/sys/dev/usb/usb_hid.c
Andrew Thompson 3e5e312a28 MFp4 //depot/projects/usb; 157814, 157863, 157868 
- The software computed HID size is not always correct, because the algoritm
  does not handle unsorted HID descriptors.
- Change the way we obtain the report ID.
- Use the X/Y/Z+button locations instead for report ID source for ums.
- Add more range checks.
- Remove Microsoft Mouse quirks. If the positions are moduloed the report
  length multiplied by 8, the values seem correct.
- Some minor style changes.

Submitted by:	Hans Petter Selasky
2009-02-24 03:34:05 +00:00

620 lines
14 KiB
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/* $NetBSD: hid.c,v 1.17 2001/11/13 06:24:53 lukem Exp $ */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*-
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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 <dev/usb/usb.h>
#include <dev/usb/usb_mfunc.h>
#include <dev/usb/usb_error.h>
#include <dev/usb/usb_defs.h>
#include <dev/usb/usbhid.h>
#define USB_DEBUG_VAR usb2_debug
#include <dev/usb/usb_core.h>
#include <dev/usb/usb_debug.h>
#include <dev/usb/usb_parse.h>
#include <dev/usb/usb_process.h>
#include <dev/usb/usb_device.h>
#include <dev/usb/usb_request.h>
#include <dev/usb/usb_hid.h>
static void hid_clear_local(struct hid_item *);
#define MAXUSAGE 100
struct hid_data {
const uint8_t *start;
const uint8_t *end;
const uint8_t *p;
struct hid_item cur;
int32_t usages[MAXUSAGE];
int nu;
int minset;
int multi;
int multimax;
int kindset;
};
/*------------------------------------------------------------------------*
* hid_clear_local
*------------------------------------------------------------------------*/
static void
hid_clear_local(struct hid_item *c)
{
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;
}
/*------------------------------------------------------------------------*
* hid_start_parse
*------------------------------------------------------------------------*/
struct hid_data *
hid_start_parse(const void *d, int len, int kindset)
{
struct hid_data *s;
s = malloc(sizeof *s, M_TEMP, M_WAITOK | M_ZERO);
s->start = s->p = d;
s->end = ((const uint8_t *)d) + len;
s->kindset = kindset;
return (s);
}
/*------------------------------------------------------------------------*
* hid_end_parse
*------------------------------------------------------------------------*/
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);
}
/*------------------------------------------------------------------------*
* hid_get_item
*------------------------------------------------------------------------*/
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 uint8_t *data;
int32_t dval;
const uint8_t *p;
struct hid_item *hi;
int i;
top:
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 = 0;
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) || (p < s->start))
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;
dval = (int16_t)dval;
break;
case 4:
dval = *data++;
dval |= *data++ << 8;
dval |= *data++ << 16;
dval |= *data++ << 24;
break;
default:
printf("BAD LENGTH %d\n", bSize);
continue;
}
switch (bType) {
case 0: /* Main */
switch (bTag) {
case 8: /* Input */
if (!(s->kindset & (1 << hid_input))) {
if (s->nu > 0)
s->nu--;
continue;
}
c->kind = hid_input;
c->flags = dval;
ret:
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 {
*h = *c;
h->next = 0;
c->loc.pos +=
c->loc.size * c->loc.count;
hid_clear_local(c);
s->minset = 0;
return (1);
}
case 9: /* Output */
if (!(s->kindset & (1 << hid_output))) {
if (s->nu > 0)
s->nu--;
continue;
}
c->kind = hid_output;
c->flags = dval;
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 */
if (!(s->kindset & (1 << hid_feature))) {
if (s->nu > 0)
s->nu--;
continue;
}
c->kind = hid_feature;
c->flags = dval;
goto ret;
case 12: /* End collection */
c->kind = hid_endcollection;
c->collevel--;
*h = *c;
hid_clear_local(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;
break;
case 9:
c->loc.count = dval;
break;
case 10: /* Push */
hi = malloc(sizeof *hi, M_TEMP, M_WAITOK);
*hi = s->cur;
c->next = hi;
break;
case 11: /* Pop */
hi = c->next;
oldpos = c->loc.pos;
s->cur = *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;
}
}
}
/*------------------------------------------------------------------------*
* hid_report_size
*------------------------------------------------------------------------*/
int
hid_report_size(const void *buf, int len, enum hid_kind k, uint8_t *id)
{
struct hid_data *d;
struct hid_item h;
uint32_t temp;
uint32_t hpos;
uint32_t lpos;
uint8_t any_id;
any_id = 0;
hpos = 0;
lpos = 0xFFFFFFFF;
for (d = hid_start_parse(buf, len, 1 << k); hid_get_item(d, &h);) {
if (h.kind == k) {
/* check for ID-byte presense */
if ((h.report_ID != 0) && !any_id) {
if (id != NULL)
*id = h.report_ID;
any_id = 1;
}
/* compute minimum */
if (lpos > h.loc.pos)
lpos = h.loc.pos;
/* compute end position */
temp = h.loc.pos + (h.loc.size * h.loc.count);
/* compute maximum */
if (hpos < temp)
hpos = temp;
}
}
hid_end_parse(d);
/* safety check - can happen in case of currupt descriptors */
if (lpos > hpos)
temp = 0;
else
temp = hpos - lpos;
/* check for ID byte */
if (any_id)
temp += 8;
else if (id != NULL)
*id = 0;
/* return length in bytes rounded up */
return ((temp + 7) / 8);
}
/*------------------------------------------------------------------------*
* hid_locate
*------------------------------------------------------------------------*/
int
hid_locate(const void *desc, int size, uint32_t u, enum hid_kind k,
struct hid_location *loc, uint32_t *flags, uint8_t *id)
{
struct hid_data *d;
struct hid_item h;
for (d = hid_start_parse(desc, size, 1 << k); hid_get_item(d, &h);) {
if (h.kind == k && !(h.flags & HIO_CONST) && h.usage == u) {
if (loc != NULL)
*loc = h.loc;
if (flags != NULL)
*flags = h.flags;
if (id != NULL)
*id = h.report_ID;
hid_end_parse(d);
return (1);
}
}
if (loc != NULL)
loc->size = 0;
if (flags != NULL)
*flags = 0;
if (id != NULL)
*id = 0;
hid_end_parse(d);
return (0);
}
/*------------------------------------------------------------------------*
* hid_get_data
*------------------------------------------------------------------------*/
uint32_t
hid_get_data(const uint8_t *buf, uint32_t len, struct hid_location *loc)
{
uint32_t hpos = loc->pos;
uint32_t hsize = loc->size;
uint32_t data;
uint32_t rpos;
uint8_t n;
DPRINTFN(11, "hid_get_data: loc %d/%d\n", hpos, hsize);
/* Range check and limit */
if (hsize == 0)
return (0);
if (hsize > 32)
hsize = 32;
/* Get data in a safe way */
data = 0;
rpos = (hpos / 8);
n = (hsize + 7) / 8;
rpos += n;
while (n--) {
rpos--;
if (rpos < len)
data |= buf[rpos] << (8 * n);
}
/* Correctly shift down data */
data = (data >> (hpos % 8));
/* Mask and sign extend in one */
n = 32 - hsize;
data = ((int32_t)data << n) >> n;
DPRINTFN(11, "hid_get_data: loc %d/%d = %lu\n",
loc->pos, loc->size, (long)data);
return (data);
}
/*------------------------------------------------------------------------*
* hid_is_collection
*------------------------------------------------------------------------*/
int
hid_is_collection(const void *desc, int size, uint32_t usage)
{
struct hid_data *hd;
struct hid_item hi;
int err;
hd = hid_start_parse(desc, size, hid_input);
if (hd == NULL)
return (0);
err = hid_get_item(hd, &hi) &&
hi.kind == hid_collection &&
hi.usage == usage;
hid_end_parse(hd);
return (err);
}
/*------------------------------------------------------------------------*
* hid_get_descriptor_from_usb
*
* This function will search for a HID descriptor between two USB
* interface descriptors.
*
* Return values:
* NULL: No more HID descriptors.
* Else: Pointer to HID descriptor.
*------------------------------------------------------------------------*/
struct usb2_hid_descriptor *
hid_get_descriptor_from_usb(struct usb2_config_descriptor *cd,
struct usb2_interface_descriptor *id)
{
struct usb2_descriptor *desc = (void *)id;
if (desc == NULL) {
return (NULL);
}
while ((desc = usb2_desc_foreach(cd, desc))) {
if ((desc->bDescriptorType == UDESC_HID) &&
(desc->bLength >= USB_HID_DESCRIPTOR_SIZE(0))) {
return (void *)desc;
}
if (desc->bDescriptorType == UDESC_INTERFACE) {
break;
}
}
return (NULL);
}
/*------------------------------------------------------------------------*
* usb2_req_get_hid_desc
*
* This function will read out an USB report descriptor from the USB
* device.
*
* Return values:
* NULL: Failure.
* Else: Success. The pointer should eventually be passed to free().
*------------------------------------------------------------------------*/
usb2_error_t
usb2_req_get_hid_desc(struct usb2_device *udev, struct mtx *mtx,
void **descp, uint16_t *sizep,
usb2_malloc_type mem, uint8_t iface_index)
{
struct usb2_interface *iface = usb2_get_iface(udev, iface_index);
struct usb2_hid_descriptor *hid;
usb2_error_t err;
if ((iface == NULL) || (iface->idesc == NULL)) {
return (USB_ERR_INVAL);
}
hid = hid_get_descriptor_from_usb
(usb2_get_config_descriptor(udev), iface->idesc);
if (hid == NULL) {
return (USB_ERR_IOERROR);
}
*sizep = UGETW(hid->descrs[0].wDescriptorLength);
if (*sizep == 0) {
return (USB_ERR_IOERROR);
}
if (mtx)
mtx_unlock(mtx);
*descp = malloc(*sizep, mem, M_ZERO | M_WAITOK);
if (mtx)
mtx_lock(mtx);
if (*descp == NULL) {
return (USB_ERR_NOMEM);
}
err = usb2_req_get_report_descriptor
(udev, mtx, *descp, *sizep, iface_index);
if (err) {
free(*descp, mem);
*descp = NULL;
return (err);
}
return (USB_ERR_NORMAL_COMPLETION);
}
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