/* $OpenBSD: utpms.c,v 1.11 2020/10/23 21:23:58 tobhe Exp $ */ /* * Copyright (c) 2005, Johan Wallén * All rights reserved. * * 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. The name of the copyright holder may not be used to endorse or * promote products derived from this software without specific * prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER ``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 COPYRIGHT OWNER 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. */ /* * The utpms driver provides support for the trackpad on new (post * February 2005) Apple PowerBooks and iBooks that are not standard * USB HID mice. */ /* * The protocol (that is, the interpretation of the data generated by * the trackpad) is taken from the Linux appletouch driver version * 0.08 by Johannes Berg, Stelian Pop and Frank Arnold. The method * used to detect fingers on the trackpad is also taken from that * driver. */ /* * PROTOCOL: * * The driver transfers continuously 81 byte events. The last byte is * 1 if the button is pressed, and is 0 otherwise. Of the remaining * bytes, 26 + 16 = 42 are sensors detecting pressure in the X or * horizontal, and Y or vertical directions, respectively. On 12 and * 15 inch PowerBooks, only the 16 first sensors in the X-direction * are used. In the X-direction, the sensors correspond to byte * positions * * 2, 7, 12, 17, 22, 27, 32, 37, 4, 9, 14, 19, 24, 29, 34, 39, 42, * 47, 52, 57, 62, 67, 72, 77, 44 and 49; * * in the Y direction, the sensors correspond to byte positions * * 1, 6, 11, 16, 21, 26, 31, 36, 3, 8, 13, 18, 23, 28, 33 and 38. * * The change in the sensor values over time is more interesting than * their absolute values: if the pressure increases, we know that the * finger has just moved there. * * We keep track of the previous sample (of sensor values in the X and * Y directions) and the accumulated change for each sensor. When we * receive a new sample, we add the difference of the new sensor value * and the old value to the accumulated change. If the accumulator * becomes negative, we set it to zero. The effect is that the * accumulator is large for sensors whose pressure has recently * increased. If there is little change in pressure (or if the * pressure decreases), the accumulator drifts back to zero. * * Since there is some fluctuations, we ignore accumulator values * below a threshold. The raw finger position is computed as a * weighted average of the other sensors (the weights are the * accumulated changes). * * For smoothing, we keep track of the previous raw finger position, * and the virtual position reported to wsmouse. The new raw position * is computed as a weighted average of the old raw position and the * computed raw position. Since this still generates some noise, we * compute a new virtual position as a weighted average of the previous * virtual position and the new raw position. The weights are * controlled by the raw change and a noise parameter. The position * is reported as a relative position. */ /* * TODO: * * Add support for other drivers of the same type. * * Add support for tapping and two-finger scrolling? The * implementation already detects two fingers, so this should be * relatively easy. * * Implement some of the mouse ioctls? * * Take care of the XXXs. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include /* The amount of data transferred by the USB device. */ #define UTPMS_DATA_LEN 81 /* The maximum number of sensors. */ #define UTPMS_X_SENSORS 26 #define UTPMS_Y_SENSORS 16 #define UTPMS_SENSORS (UTPMS_X_SENSORS + UTPMS_Y_SENSORS) /* * Parameters for supported devices. For generality, these parameters * can be different for each device. The meanings of the parameters * are as follows. * * type: Type of the trackpad device, used for dmesg output, and * to know some of the device parameters. * * noise: Amount of noise in the computed position. This controls * how large a change must be to get reported, and how * large enough changes are smoothed. A good value can * probably only be found experimentally, but something around * 16 seems suitable. * * product: The product ID of the trackpad. * * * threshold: Accumulated changes less than this are ignored. A good * value could be determined experimentally, but 5 is a * reasonable guess. * * vendor: The vendor ID. Currently USB_VENDOR_APPLE for all devices. * * x_factor: Factor used in computations with X-coordinates. If the * x-resolution of the display is x, this should be * (x + 1) / (x_sensors - 1). Other values work fine, but * then the aspect ratio is not necessarily kept. * * x_sensors: The number of sensors in the X-direction. * * y_factor: As x_factors, but for Y-coordinates. * * y_sensors: The number of sensors in the Y-direction. */ struct utpms_dev { int type; /* Type of the trackpad. */ #define FOUNTAIN 0x00 #define GEYSER1 0x01 #define GEYSER2 0x02 int noise; /* Amount of noise in the computed position. */ int threshold; /* Changes less than this are ignored. */ int x_factor; /* Factor used in computation with X-coordinates. */ int x_sensors; /* The number of X-sensors. */ int y_factor; /* Factor used in computation with Y-coordinates. */ int y_sensors; /* The number of Y-sensors. */ uint16_t product; /* Product ID. */ uint16_t vendor; /* The vendor ID. */ }; static struct utpms_dev utpms_devices[] = { #define UTPMS_TOUCHPAD(ttype, prod, x_fact, x_sens, y_fact) \ { \ .type = (ttype), \ .vendor = USB_VENDOR_APPLE, \ .product = (prod), \ .noise = 16, \ .threshold = 5, \ .x_factor = (x_fact), \ .x_sensors = (x_sens), \ .y_factor = (y_fact), \ .y_sensors = 16 \ } /* 12 inch PowerBooks */ UTPMS_TOUCHPAD(FOUNTAIN, 0x030a, 69, 16, 52), /* 12 and 14 inch iBook G4 */ UTPMS_TOUCHPAD(GEYSER1, 0x030b, 69, 16, 52), /* 15 inch PowerBooks */ UTPMS_TOUCHPAD(FOUNTAIN, 0x020e, 85, 16, 57), UTPMS_TOUCHPAD(FOUNTAIN, 0x020f, 85, 16, 57), UTPMS_TOUCHPAD(GEYSER2, 0x0214, 90, 15, 107), UTPMS_TOUCHPAD(GEYSER2, 0x0215, 90, 15, 107), UTPMS_TOUCHPAD(GEYSER2, 0x0216, 90, 15, 107), /* 17 inch PowerBooks */ UTPMS_TOUCHPAD(FOUNTAIN, 0x020d, 71, 26, 68), #undef UTPMS_TOUCHPAD }; struct utpms_softc { struct uhidev sc_hdev; /* USB parent (got the struct device). */ int sc_type; /* Type of the trackpad */ int sc_datalen; int sc_acc[UTPMS_SENSORS]; /* Accumulated sensor values. */ unsigned char sc_prev[UTPMS_SENSORS]; /* Previous sample. */ unsigned char sc_sample[UTPMS_SENSORS]; /* Current sample. */ struct device *sc_wsmousedev; /* WSMouse device. */ int sc_noise; /* Amount of noise. */ int sc_threshold; /* Threshold value. */ int sc_x; /* Virtual position in horizontal * direction (wsmouse position). */ int sc_x_factor; /* X-coordinate factor. */ int sc_x_raw; /* X-position of finger on trackpad. */ int sc_x_sensors; /* Number of X-sensors. */ int sc_y; /* Virtual position in vertical direction * (wsmouse position). */ int sc_y_factor; /* Y-coordinate factor. */ int sc_y_raw; /* Y-position of finger on trackpad. */ int sc_y_sensors; /* Number of Y-sensors. */ uint32_t sc_buttons; /* Button state. */ uint32_t sc_status; /* Status flags. */ #define UTPMS_ENABLED 1 /* Is the device enabled? */ #define UTPMS_VALID 4 /* Is the previous sample valid? */ }; void utpms_intr(struct uhidev *, void *, unsigned int); int utpms_enable(void *); void utpms_disable(void *); int utpms_ioctl(void *, unsigned long, caddr_t, int, struct proc *); void reorder_sample(struct utpms_softc*, unsigned char *, unsigned char *); int compute_delta(struct utpms_softc *, int *, int *, int *, uint32_t *); int detect_pos(int *, int, int, int, int *, int *); int smooth_pos(int, int, int); const struct wsmouse_accessops utpms_accessops = { utpms_enable, utpms_ioctl, utpms_disable, }; int utpms_match(struct device *, void *, void *); void utpms_attach(struct device *, struct device *, void *); int utpms_detach(struct device *, int); int utpms_activate(struct device *, int); struct cfdriver utpms_cd = { NULL, "utpms", DV_DULL }; const struct cfattach utpms_ca = { sizeof(struct utpms_softc), utpms_match, utpms_attach, utpms_detach, utpms_activate, }; int utpms_match(struct device *parent, void *match, void *aux) { struct uhidev_attach_arg *uha = (struct uhidev_attach_arg *)aux; usb_interface_descriptor_t *id; int i; id = usbd_get_interface_descriptor(uha->uaa->iface); if (id == NULL || id->bInterfaceSubClass != UISUBCLASS_BOOT || id->bInterfaceProtocol != UIPROTO_BOOT_MOUSE) return (UMATCH_NONE); /* * We just check if the vendor and product IDs have the magic numbers * we expect. */ for (i = 0; i < nitems(utpms_devices); i++) { if (uha->uaa->vendor == utpms_devices[i].vendor && uha->uaa->product == utpms_devices[i].product) return (UMATCH_IFACECLASS); } return (UMATCH_NONE); } void utpms_attach(struct device *parent, struct device *self, void *aux) { struct utpms_softc *sc = (struct utpms_softc *)self; struct uhidev_attach_arg *uha = (struct uhidev_attach_arg *)aux; struct wsmousedev_attach_args a; struct utpms_dev *pd; usb_device_descriptor_t *udd; int i; uint16_t vendor, product; sc->sc_datalen = UTPMS_DATA_LEN; sc->sc_hdev.sc_udev = uha->uaa->device; usbd_set_idle(uha->parent->sc_udev, uha->parent->sc_ifaceno, 0, 0); /* Fill in device-specific parameters. */ if ((udd = usbd_get_device_descriptor(uha->parent->sc_udev)) != NULL) { product = UGETW(udd->idProduct); vendor = UGETW(udd->idVendor); for (i = 0; i < nitems(utpms_devices); i++) { pd = &utpms_devices[i]; if (product == pd->product && vendor == pd->vendor) { sc->sc_noise = pd->noise; sc->sc_threshold = pd->threshold; sc->sc_x_factor = pd->x_factor; sc->sc_x_sensors = pd->x_sensors; sc->sc_y_factor = pd->y_factor; sc->sc_y_sensors = pd->y_sensors; switch (pd->type) { case FOUNTAIN: printf(": Fountain"); break; case GEYSER1: printf(": Geyser"); break; case GEYSER2: sc->sc_type = GEYSER2; sc->sc_datalen = 64; sc->sc_y_sensors = 9; printf(": Geyser 2"); break; } printf(" Trackpad\n"); break; } } } if (sc->sc_x_sensors <= 0 || sc->sc_x_sensors > UTPMS_X_SENSORS || sc->sc_y_sensors <= 0 || sc->sc_y_sensors > UTPMS_Y_SENSORS) { printf(": unexpected sensors configuration (%d:%d)\n", sc->sc_x_sensors, sc->sc_y_sensors); return; } sc->sc_hdev.sc_intr = utpms_intr; sc->sc_hdev.sc_parent = uha->parent; sc->sc_hdev.sc_report_id = uha->reportid; sc->sc_status = 0; a.accessops = &utpms_accessops; a.accesscookie = sc; sc->sc_wsmousedev = config_found(self, &a, wsmousedevprint); } int utpms_detach(struct device *self, int flags) { struct utpms_softc *sc = (struct utpms_softc *)self; int ret = 0; /* The wsmouse driver does all the work. */ if (sc->sc_wsmousedev != NULL) ret = config_detach(sc->sc_wsmousedev, flags); return (ret); } int utpms_activate(struct device *self, int act) { struct utpms_softc *sc = (struct utpms_softc *)self; int rv = 0; if (act == DVACT_DEACTIVATE) { if (sc->sc_wsmousedev != NULL) rv = config_deactivate(sc->sc_wsmousedev); } return (rv); } int utpms_enable(void *v) { struct utpms_softc *sc = v; /* Check that we are not detaching or already enabled. */ if (sc->sc_status & usbd_is_dying(sc->sc_hdev.sc_udev)) return (EIO); if (sc->sc_status & UTPMS_ENABLED) return (EBUSY); sc->sc_status |= UTPMS_ENABLED; sc->sc_status &= ~UTPMS_VALID; sc->sc_buttons = 0; bzero(sc->sc_sample, sizeof(sc->sc_sample)); return (uhidev_open(&sc->sc_hdev)); } void utpms_disable(void *v) { struct utpms_softc *sc = v; if (!(sc->sc_status & UTPMS_ENABLED)) return; sc->sc_status &= ~UTPMS_ENABLED; uhidev_close(&sc->sc_hdev); } int utpms_ioctl(void *v, unsigned long cmd, caddr_t data, int flag, struct proc *p) { switch (cmd) { case WSMOUSEIO_GTYPE: *(u_int *)data = WSMOUSE_TYPE_USB; return (0); } return (-1); } void utpms_intr(struct uhidev *addr, void *ibuf, unsigned int len) { struct utpms_softc *sc = (struct utpms_softc *)addr; unsigned char *data; int dx, dy, dz, i, s; uint32_t buttons; /* Ignore incomplete data packets. */ if (len != sc->sc_datalen) return; data = ibuf; /* The last byte is 1 if the button is pressed and 0 otherwise. */ buttons = !!data[sc->sc_datalen - 1]; /* Everything below assumes that the sample is reordered. */ reorder_sample(sc, sc->sc_sample, data); /* Is this the first sample? */ if (!(sc->sc_status & UTPMS_VALID)) { sc->sc_status |= UTPMS_VALID; sc->sc_x = sc->sc_y = -1; sc->sc_x_raw = sc->sc_y_raw = -1; memcpy(sc->sc_prev, sc->sc_sample, sizeof(sc->sc_prev)); bzero(sc->sc_acc, sizeof(sc->sc_acc)); return; } /* Accumulate the sensor change while keeping it nonnegative. */ for (i = 0; i < UTPMS_SENSORS; i++) { sc->sc_acc[i] += (signed char)(sc->sc_sample[i] - sc->sc_prev[i]); if (sc->sc_acc[i] < 0) sc->sc_acc[i] = 0; } memcpy(sc->sc_prev, sc->sc_sample, sizeof(sc->sc_prev)); /* Compute change. */ dx = dy = dz = 0; if (!compute_delta(sc, &dx, &dy, &dz, &buttons)) return; /* Report to wsmouse. */ if ((dx != 0 || dy != 0 || dz != 0 || buttons != sc->sc_buttons) && sc->sc_wsmousedev != NULL) { s = spltty(); WSMOUSE_INPUT(sc->sc_wsmousedev, buttons, dx, -dy, dz, 0); splx(s); } sc->sc_buttons = buttons; } /* * Reorder the sensor values so that all the X-sensors are before the * Y-sensors in the natural order. Note that this might have to be * rewritten if UTPMS_X_SENSORS or UTPMS_Y_SENSORS change. */ void reorder_sample(struct utpms_softc *sc, unsigned char *to, unsigned char *from) { int i; if (sc->sc_type == GEYSER2) { int j; bzero(to, UTPMS_SENSORS); for (i = 0, j = 19; i < 20; i += 2, j += 3) { to[i] = from[j]; to[i + 1] = from[j + 1]; } for (i = 0, j = 1; i < 9; i += 2, j += 3) { to[UTPMS_X_SENSORS + i] = from[j]; to[UTPMS_X_SENSORS + i + 1] = from[j + 1]; } } else { for (i = 0; i < 8; i++) { /* X-sensors. */ to[i] = from[5 * i + 2]; to[i + 8] = from[5 * i + 4]; to[i + 16] = from[5 * i + 42]; #if 0 /* * XXX This seems to introduce random ventical jumps, * so we ignore these sensors until we figure out * their meaning. */ if (i < 2) to[i + 24] = from[5 * i + 44]; #endif /* 0 */ /* Y-sensors. */ to[i + 26] = from[5 * i + 1]; to[i + 34] = from[5 * i + 3]; } } } /* * Compute the change in x, y and z direction, update the button state * (to simulate more than one button, scrolling etc.), and update the * history. Note that dx, dy, dz and buttons are modified only if * corresponding pressure is detected and should thus be initialised * before the call. Return 0 on error. * * XXX Could we report something useful in dz? */ int compute_delta(struct utpms_softc *sc, int *dx, int *dy, int *dz, uint32_t * buttons) { int x_det, y_det, x_raw, y_raw, x_fingers, y_fingers, fingers, x, y; x_det = detect_pos(sc->sc_acc, sc->sc_x_sensors, sc->sc_threshold, sc->sc_x_factor, &x_raw, &x_fingers); y_det = detect_pos(sc->sc_acc + UTPMS_X_SENSORS, sc->sc_y_sensors, sc->sc_threshold, sc->sc_y_factor, &y_raw, &y_fingers); fingers = max(x_fingers, y_fingers); /* Check the number of fingers and if we have detected a position. */ if (x_det == 0 && y_det == 0) { /* No position detected, resetting. */ bzero(sc->sc_acc, sizeof(sc->sc_acc)); sc->sc_x_raw = sc->sc_y_raw = sc->sc_x = sc->sc_y = -1; } else if (x_det > 0 && y_det > 0) { switch (fingers) { case 1: /* Smooth position. */ if (sc->sc_x_raw >= 0) { sc->sc_x_raw = (3 * sc->sc_x_raw + x_raw) / 4; sc->sc_y_raw = (3 * sc->sc_y_raw + y_raw) / 4; /* * Compute virtual position and change if we * already have a decent position. */ if (sc->sc_x >= 0) { x = smooth_pos(sc->sc_x, sc->sc_x_raw, sc->sc_noise); y = smooth_pos(sc->sc_y, sc->sc_y_raw, sc->sc_noise); *dx = x - sc->sc_x; *dy = y - sc->sc_y; sc->sc_x = x; sc->sc_y = y; } else { /* Initialise virtual position. */ sc->sc_x = sc->sc_x_raw; sc->sc_y = sc->sc_y_raw; } } else { /* Initialise raw position. */ sc->sc_x_raw = x_raw; sc->sc_y_raw = y_raw; } break; case 2: if (*buttons == 1) *buttons = 4; break; case 3: if (*buttons == 1) *buttons = 2; break; } } return (1); } /* * Compute the new smoothed position from the previous smoothed position * and the raw position. */ int smooth_pos(int pos_old, int pos_raw, int noise) { int ad, delta; delta = pos_raw - pos_old; ad = abs(delta); /* Too small changes are ignored. */ if (ad < noise / 2) delta = 0; /* A bit larger changes are smoothed. */ else if (ad < noise) delta /= 4; else if (ad < 2 * noise) delta /= 2; return (pos_old + delta); } /* * Detect the position of the finger. Returns the total pressure. * The position is returned in pos_ret and the number of fingers * is returned in fingers_ret. The position returned in pos_ret * is in [0, (n_sensors - 1) * factor - 1]. */ int detect_pos(int *sensors, int n_sensors, int threshold, int fact, int *pos_ret, int *fingers_ret) { int i, w, s; /* * Compute the number of fingers, total pressure, and weighted * position of the fingers. */ *fingers_ret = 0; w = s = 0; for (i = 0; i < n_sensors; i++) { if (sensors[i] >= threshold) { if (i == 0 || sensors[i - 1] < threshold) *fingers_ret += 1; s += sensors[i] - threshold; w += (sensors[i] - threshold) * i; } } if (s > 0) *pos_ret = w * fact / s; return (s); }