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hconf(4): Do not fetch report before writing new usage values back.

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There is a report that reading of surface/button switch feature report
causes SYN1B7D touchpad malfunction.  As specs does not require it to
be readable assume that report usages have default value on attach and
last written value during operation. Do not apply default usage values
on attachment and resume.
While here fix manpage typos and add avg@ to copyright header.

Reported by:	Jakob Alvermark <jakob_AT_alvermark_DOT_net>
Reviewed by:	avg
Differential revision:	https://reviews.freebsd.org/D28196
This commit is contained in:
Vladimir Kondratyev 2021-01-20 23:10:06 +03:00
parent 8e67b9389d
commit fa656aefe4
2 changed files with 30 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
share/man/man4/hconf.4
View File

@ -23,7 +23,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd September 14, 2020
.Dd January 18, 2021
.Dt HCONF 4
.Os
.Sh NAME
@ -61,11 +61,11 @@ Debug parameter is available as
.Xr loader 8
tunable as well.
.Bl -tag -width indent
.It Va dev.hmt.*.input_mode
.It Va dev.hconf.*.input_mode
HID device input mode: 0 = mouse, 3 = touchpad.
.It Va dev.hmt.*.surface_switch
.It Va dev.hconf.*.surface_switch
Enable / disable switch for surface: 1 = on, 0 = off.
.It Va dev.hmt.*.buttons_switch
.It Va dev.hconf.*.buttons_switch
Enable / disable switch for buttons: 1 = on, 0 = off.
.It Va hw.hid.hconf.debug
Debug output level, where 0 is debugging disabled and larger values increase

55
sys/dev/hid/hconf.c
View File

@ -2,6 +2,7 @@
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2019 Vladimir Kondratyev <wulf@FreeBSD.org>
* Copyright (c) 2020 Andriy Gapon <avg@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -69,21 +70,25 @@ struct feature_control_descr {
const char *name;
const char *descr;
uint16_t usage;
u_int value;
} feature_control_descrs[] = {
[INPUT_MODE] = {
.name = "input_mode",
.descr = "HID device input mode: 0 = mouse, 3 = touchpad",
.usage = HUD_INPUT_MODE
.usage = HUD_INPUT_MODE,
.value = HCONF_INPUT_MODE_MOUSE,
},
[SURFACE_SWITCH] = {
.name = "surface_switch",
.descr = "Enable / disable switch for surface: 1 = on, 0 = off",
.usage = HUD_SURFACE_SWITCH
.usage = HUD_SURFACE_SWITCH,
.value = 1,
},
[BUTTONS_SWITCH] = {
.name = "buttons_switch",
.descr = "Enable / disable switch for buttons: 1 = on, 0 = off",
.usage = HUD_BUTTONS_SWITCH
.usage = HUD_BUTTONS_SWITCH,
.value = 1,
},
};
@ -145,35 +150,25 @@ hconf_set_feature_control(struct hconf_softc *sc, int ctrl_id, u_int val)
fbuf = malloc(fc->rlen, M_TEMP, M_WAITOK | M_ZERO);
sx_xlock(&sc->lock);
/* Reports are not strictly required to be readable */
error = hid_get_report(sc->dev, fbuf, fc->rlen, NULL,
HID_FEATURE_REPORT, fc->rid);
/*
* If the report is write-only, then we have to check for other controls
* that may share the same report and set their bits as well.
* Assume the report is write-only. Then we have to check for other
* controls that may share the same report and set their bits as well.
*/
if (error != 0) {
bzero(fbuf + 1, fc->rlen - 1);
for (i = 0; i < nitems(sc->feature_controls); i++) {
struct feature_control *ofc = &sc->feature_controls[i];
bzero(fbuf + 1, fc->rlen - 1);
for (i = 0; i < nitems(sc->feature_controls); i++) {
struct feature_control *ofc = &sc->feature_controls[i];
/* Skip unrelated report IDs. */
if (ofc->rid != fc->rid)
continue;
/* Skip self. */
if (ofc == fc)
continue;
KASSERT(fc->rlen == ofc->rlen,
("different lengths for report %d: %d vs %d\n",
fc->rid, fc->rlen, ofc->rlen));
hid_put_udata(fbuf + 1, ofc->rlen - 1, &ofc->loc,
ofc->val);
}
/* Skip unrelated report IDs. */
if (ofc->rid != fc->rid)
continue;
KASSERT(fc->rlen == ofc->rlen,
("different lengths for report %d: %d vs %d\n",
fc->rid, fc->rlen, ofc->rlen));
hid_put_udata(fbuf + 1, ofc->rlen - 1, &ofc->loc,
i == ctrl_id ? val : ofc->val);
}
fbuf[0] = fc->rid;
hid_put_udata(fbuf + 1, fc->rlen - 1, &fc->loc, val);
error = hid_set_report(sc->dev, fbuf, fc->rlen,
HID_FEATURE_REPORT, fc->rid);
@ -277,11 +272,9 @@ hconf_attach(device_t dev)
sc, i, hconf_feature_control_handler, "I",
feature_control_descrs[i].descr);
}
sc->feature_controls[i].val = feature_control_descrs[i].value;
}
/* Fully enable (at least, try to). */
(void)hconf_set_feature_control(sc, SURFACE_SWITCH, 1);
(void)hconf_set_feature_control(sc, BUTTONS_SWITCH, 1);
return (0);
}
@ -305,6 +298,10 @@ hconf_resume(device_t dev)
for (i = 0; i < nitems(sc->feature_controls); i++) {
if (sc->feature_controls[i].rlen < 2)
continue;
/* Do not update usages to default value */
if (sc->feature_controls[i].val ==
feature_control_descrs[i].value)
continue;
error = hconf_set_feature_control(sc, i,
sc->feature_controls[i].val);
if (error != 0) {