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Restore handling of the third argument (id) of hid_start_parse(), same as

Browse source 
it is done in NetBSD/OpenBSD, and as it was here before r205728.

I personally think this API or its implementation is incorrect, as it is not
correct to filter collections based on report ID, as they are orthogonal
in general case, but I see no harm from supporting this feature.

PR:		usb/171810
Submitted by:	Vitaly Magerya <vmagerya@gmail.com>
MFC after:	1 month
This commit is contained in:
Alexander Motin 2012-09-20 18:56:27 +00:00
parent 2a4e4c6772
commit ec9b9fbd50
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=240762
3 changed files with 23 additions and 9 deletions
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2
lib/libusbhid/descr.c
View file

@ -68,7 +68,7 @@ hid_get_report_id(int fd)
if ((rep = hid_get_report_desc(fd)) == NULL)
goto use_ioctl;
kindset = 1 << hid_input | 1 << hid_output | 1 << hid_feature;
for (d = hid_start_parse(rep, kindset, 0); hid_get_item(d, &h); ) {
for (d = hid_start_parse(rep, kindset, -1); hid_get_item(d, &h); ) {
/* Return the first report ID we met. */
if (h.report_ID != 0) {
temp = h.report_ID;

23
lib/libusbhid/parse.c
View file

@ -70,6 +70,7 @@ struct hid_data {
uint8_t iusage; /* current "usages_min/max" index */
uint8_t ousage; /* current "usages_min/max" offset */
uint8_t susage; /* usage set flags */
int32_t reportid; /* requested report ID */
};
/*------------------------------------------------------------------------*
@ -149,7 +150,7 @@ hid_switch_rid(struct hid_data *s, struct hid_item *c, int32_t next_rID)
* hid_start_parse
*------------------------------------------------------------------------*/
hid_data_t
hid_start_parse(report_desc_t d, int kindset, int id __unused)
hid_start_parse(report_desc_t d, int kindset, int id)
{
struct hid_data *s;
@ -158,6 +159,7 @@ hid_start_parse(report_desc_t d, int kindset, int id __unused)
s->start = s->p = d->data;
s->end = d->data + d->size;
s->kindset = kindset;
s->reportid = id;
return (s);
}
@ -207,8 +209,8 @@ hid_get_byte(struct hid_data *s, const uint16_t wSize)
/*------------------------------------------------------------------------*
* hid_get_item
*------------------------------------------------------------------------*/
int
hid_get_item(hid_data_t s, hid_item_t *h)
static int
hid_get_item_raw(hid_data_t s, hid_item_t *h)
{
hid_item_t *c;
unsigned int bTag, bType, bSize;
@ -508,6 +510,19 @@ hid_get_item(hid_data_t s, hid_item_t *h)
return (0);
}
int
hid_get_item(hid_data_t s, hid_item_t *h)
{
int r;
for (;;) {
r = hid_get_item_raw(s, h);
if (r <= 0 || s->reportid == -1 || h->report_ID == s->reportid)
break;
}
return (r);
}
int
hid_report_size(report_desc_t r, enum hid_kind k, int id)
{
@ -523,7 +538,7 @@ hid_report_size(report_desc_t r, enum hid_kind k, int id)
memset(&h, 0, sizeof h);
for (d = hid_start_parse(r, 1 << k, id); hid_get_item(d, &h); ) {
if ((h.report_ID == id || id < 0) && h.kind == k) {
if (h.kind == k) {
/* compute minimum */
if (lpos > h.pos)
lpos = h.pos;

7
lib/libusbhid/usbhid.3
View file

@ -144,16 +144,15 @@ fails it will return
.Ss Descriptor Parsing Functions
To parse the report descriptor the
.Fn hid_start_parse
function should be called with a report descriptor and a set that
describes which items that are interesting.
function should be called with a report descriptor, a set that
describes which items that are interesting, and the desired report
ID (or -1 to obtain items of all report IDs).
The set is obtained by OR-ing together values
.Fa "(1 << k)"
where
.Fa k
is an item of type
.Vt hid_kind_t .
The report ID (if present) is given by
.Fa id .
The function returns
.Dv NULL
if the initialization fails, otherwise an opaque value to be used