/* $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 * * 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 #include #include #include #include #include #include #include #include #include #include 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); }