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/* $OpenBSD: imt.c,v 1.5 2020/07/09 21:01:56 jcs Exp $ */
/*
* HID-over-i2c multitouch trackpad driver for devices conforming to
* Windows Precision Touchpad standard
*
* https://docs.microsoft.com/en-us/windows-hardware/design/component-guidelines/windows-precision-touchpad-required-hid-top-level-collections
*
* Copyright (c) 2016 joshua stein <jcs@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <dev/i2c/i2cvar.h>
#include <dev/i2c/ihidev.h>
#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsmousevar.h>
#include <dev/hid/hid.h>
#include <dev/hid/hidmtvar.h>
struct imt_softc {
struct ihidev sc_hdev;
struct hidmt sc_mt;
int sc_rep_input;
int sc_rep_config;
int sc_rep_cap;
};
int imt_enable(void *);
int imt_open(struct ihidev *);
void imt_intr(struct ihidev *, void *, u_int);
void imt_disable(void *);
int imt_ioctl(void *, u_long, caddr_t, int, struct proc *);
const struct wsmouse_accessops imt_accessops = {
imt_enable,
imt_ioctl,
imt_disable,
};
int imt_match(struct device *, void *, void *);
int imt_find_winptp_reports(struct ihidev_softc *, void *, int,
struct imt_softc *);
void imt_attach(struct device *, struct device *, void *);
int imt_hidev_get_report(struct device *, int, int, void *, int);
int imt_hidev_set_report(struct device *, int, int, void *, int);
int imt_detach(struct device *, int);
struct cfdriver imt_cd = {
NULL, "imt", DV_DULL
};
const struct cfattach imt_ca = {
sizeof(struct imt_softc),
imt_match,
imt_attach,
imt_detach
};
int
imt_match(struct device *parent, void *match, void *aux)
{
struct ihidev_attach_arg *iha = (struct ihidev_attach_arg *)aux;
struct imt_softc sc;
int size;
void *desc;
if (iha->reportid == IHIDEV_CLAIM_MULTIPLEID) {
ihidev_get_report_desc(iha->parent, &desc, &size);
if (imt_find_winptp_reports(iha->parent, desc, size, &sc)) {
iha->claims[0] = sc.sc_rep_input;
iha->claims[1] = sc.sc_rep_config;
iha->claims[2] = sc.sc_rep_cap;
iha->nclaims = 3;
return (IMATCH_DEVCLASS_DEVSUBCLASS);
}
}
return (IMATCH_NONE);
}
int
imt_find_winptp_reports(struct ihidev_softc *parent, void *desc, int size,
struct imt_softc *sc)
{
int repid;
int input = 0, conf = 0, cap = 0;
if (sc != NULL) {
sc->sc_rep_input = -1;
sc->sc_rep_config = -1;
sc->sc_rep_cap = -1;
}
for (repid = 0; repid < parent->sc_nrepid; repid++) {
if (hid_report_size(desc, size, hid_input, repid) == 0 &&
hid_report_size(desc, size, hid_output, repid) == 0 &&
hid_report_size(desc, size, hid_feature, repid) == 0)
continue;
if (hid_is_collection(desc, size, repid,
HID_USAGE2(HUP_DIGITIZERS, HUD_TOUCHPAD))) {
input = 1;
if (sc != NULL && sc->sc_rep_input == -1)
sc->sc_rep_input = repid;
} else if (hid_is_collection(desc, size, repid,
HID_USAGE2(HUP_DIGITIZERS, HUD_CONFIG))) {
conf = 1;
if (sc != NULL && sc->sc_rep_config == -1)
sc->sc_rep_config = repid;
}
/* capabilities report could be anywhere */
if (hid_locate(desc, size, HID_USAGE2(HUP_DIGITIZERS,
HUD_CONTACT_MAX), repid, hid_feature, NULL, NULL)) {
cap = 1;
if (sc != NULL && sc->sc_rep_cap == -1)
sc->sc_rep_cap = repid;
}
}
return (conf && input && cap);
}
void
imt_attach(struct device *parent, struct device *self, void *aux)
{
struct imt_softc *sc = (struct imt_softc *)self;
struct hidmt *mt = &sc->sc_mt;
struct ihidev_attach_arg *iha = (struct ihidev_attach_arg *)aux;
int size;
void *desc;
sc->sc_hdev.sc_intr = imt_intr;
sc->sc_hdev.sc_parent = iha->parent;
ihidev_get_report_desc(iha->parent, &desc, &size);
imt_find_winptp_reports(iha->parent, desc, size, sc);
memset(mt, 0, sizeof(sc->sc_mt));
/* assume everything has "natural scrolling" where Y axis is reversed */
mt->sc_flags = HIDMT_REVY;
mt->hidev_report_type_conv = ihidev_report_type_conv;
mt->hidev_get_report = imt_hidev_get_report;
mt->hidev_set_report = imt_hidev_set_report;
mt->sc_rep_input = sc->sc_rep_input;
mt->sc_rep_config = sc->sc_rep_config;
mt->sc_rep_cap = sc->sc_rep_cap;
if (hidmt_setup(self, mt, desc, size) != 0)
return;
hidmt_attach(mt, &imt_accessops);
}
int
imt_hidev_get_report(struct device *self, int type, int id, void *data, int len)
{
struct imt_softc *sc = (struct imt_softc *)self;
return ihidev_get_report((struct device *)sc->sc_hdev.sc_parent, type,
id, data, len);
}
int
imt_hidev_set_report(struct device *self, int type, int id, void *data, int len)
{
struct imt_softc *sc = (struct imt_softc *)self;
return ihidev_set_report((struct device *)sc->sc_hdev.sc_parent, type,
id, data, len);
}
int
imt_detach(struct device *self, int flags)
{
struct imt_softc *sc = (struct imt_softc *)self;
struct hidmt *mt = &sc->sc_mt;
return hidmt_detach(mt, flags);
}
void
imt_intr(struct ihidev *dev, void *buf, u_int len)
{
struct imt_softc *sc = (struct imt_softc *)dev;
struct hidmt *mt = &sc->sc_mt;
if (!mt->sc_enabled)
return;
hidmt_input(mt, (uint8_t *)buf, len);
}
int
imt_enable(void *v)
{
struct imt_softc *sc = v;
struct hidmt *mt = &sc->sc_mt;
int rv;
if ((rv = hidmt_enable(mt)) != 0)
return rv;
rv = ihidev_open(&sc->sc_hdev);
hidmt_set_input_mode(mt, HIDMT_INPUT_MODE_MT_TOUCHPAD);
return rv;
}
void
imt_disable(void *v)
{
struct imt_softc *sc = v;
struct hidmt *mt = &sc->sc_mt;
hidmt_disable(mt);
ihidev_close(&sc->sc_hdev);
}
int
imt_ioctl(void *v, u_long cmd, caddr_t data, int flag, struct proc *p)
{
struct imt_softc *sc = v;
struct hidmt *mt = &sc->sc_mt;
int rc;
rc = ihidev_ioctl(&sc->sc_hdev, cmd, data, flag, p);
if (rc != -1)
return rc;
return hidmt_ioctl(mt, cmd, data, flag, p);
}
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