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-rw-r--r--src/evdev.c653
1 files changed, 653 insertions, 0 deletions
diff --git a/src/evdev.c b/src/evdev.c
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+++ b/src/evdev.c
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+/*
+ * Copyright © 2010 Intel Corporation
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of the copyright holders not be used in
+ * advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission. The copyright holders make
+ * no representations about the suitability of this software for any
+ * purpose. It is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <linux/input.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include "compositor.h"
+#include "evdev.h"
+
+struct evdev_input {
+ struct weston_input_device base;
+ struct wl_list devices_list;
+ struct udev_monitor *udev_monitor;
+ char *seat_id;
+};
+
+#define MAX_SLOTS 16
+
+struct evdev_input_device {
+ struct evdev_input *master;
+ struct wl_list link;
+ struct wl_event_source *source;
+ struct weston_output *output;
+ char *devnode;
+ int fd;
+ struct {
+ int min_x, max_x, min_y, max_y;
+ int old_x, old_y, reset_x, reset_y;
+ int32_t x, y;
+ } abs;
+
+ struct {
+ int slot;
+ int32_t x[MAX_SLOTS];
+ int32_t y[MAX_SLOTS];
+ } mt;
+
+ struct {
+ int dx, dy;
+ } rel;
+
+ int type; /* event type flags */
+
+ int is_touchpad, is_mt;
+};
+
+/* event type flags */
+#define EVDEV_ABSOLUTE_MOTION (1 << 0)
+#define EVDEV_ABSOLUTE_MT_DOWN (1 << 1)
+#define EVDEV_ABSOLUTE_MT_MOTION (1 << 2)
+#define EVDEV_ABSOLUTE_MT_UP (1 << 3)
+#define EVDEV_RELATIVE_MOTION (1 << 4)
+
+static inline void
+evdev_process_key(struct evdev_input_device *device,
+ struct input_event *e, int time)
+{
+ if (e->value == 2)
+ return;
+
+ switch (e->code) {
+ case BTN_TOOL_PEN:
+ case BTN_TOOL_RUBBER:
+ case BTN_TOOL_BRUSH:
+ case BTN_TOOL_PENCIL:
+ case BTN_TOOL_AIRBRUSH:
+ case BTN_TOOL_FINGER:
+ case BTN_TOOL_MOUSE:
+ case BTN_TOOL_LENS:
+ if (device->is_touchpad)
+ {
+ device->abs.reset_x = 1;
+ device->abs.reset_y = 1;
+ }
+ break;
+ case BTN_TOUCH:
+ /* Multitouch touchscreen devices might not send individually
+ * button events each time a new finger is down. So we don't
+ * send notification for such devices and we solve the button
+ * case emulating on compositor side. */
+ if (device->is_mt)
+ break;
+
+ /* Treat BTN_TOUCH from devices that only have BTN_TOUCH as
+ * BTN_LEFT */
+ e->code = BTN_LEFT;
+ /* Intentional fallthrough! */
+ case BTN_LEFT:
+ case BTN_RIGHT:
+ case BTN_MIDDLE:
+ case BTN_SIDE:
+ case BTN_EXTRA:
+ case BTN_FORWARD:
+ case BTN_BACK:
+ case BTN_TASK:
+ notify_button(&device->master->base.input_device,
+ time, e->code, e->value);
+ break;
+
+ default:
+ notify_key(&device->master->base.input_device,
+ time, e->code, e->value);
+ break;
+ }
+}
+
+static void
+evdev_process_touch(struct evdev_input_device *device,
+ struct input_event *e)
+{
+ const int screen_width = device->output->current->width;
+ const int screen_height = device->output->current->height;
+
+ switch (e->code) {
+ case ABS_MT_SLOT:
+ device->mt.slot = e->value;
+ break;
+ case ABS_MT_TRACKING_ID:
+ if (e->value >= 0)
+ device->type |= EVDEV_ABSOLUTE_MT_DOWN;
+ else
+ device->type |= EVDEV_ABSOLUTE_MT_UP;
+ break;
+ case ABS_MT_POSITION_X:
+ device->mt.x[device->mt.slot] =
+ (e->value - device->abs.min_x) * screen_width /
+ (device->abs.max_x - device->abs.min_x) +
+ device->output->x;
+ device->type |= EVDEV_ABSOLUTE_MT_MOTION;
+ break;
+ case ABS_MT_POSITION_Y:
+ device->mt.y[device->mt.slot] =
+ (e->value - device->abs.min_y) * screen_height /
+ (device->abs.max_y - device->abs.min_y) +
+ device->output->y;
+ device->type |= EVDEV_ABSOLUTE_MT_MOTION;
+ break;
+ }
+}
+
+static inline void
+evdev_process_absolute_motion(struct evdev_input_device *device,
+ struct input_event *e)
+{
+ const int screen_width = device->output->current->width;
+ const int screen_height = device->output->current->height;
+
+ switch (e->code) {
+ case ABS_X:
+ device->abs.x =
+ (e->value - device->abs.min_x) * screen_width /
+ (device->abs.max_x - device->abs.min_x) +
+ device->output->x;
+ device->type |= EVDEV_ABSOLUTE_MOTION;
+ break;
+ case ABS_Y:
+ device->abs.y =
+ (e->value - device->abs.min_y) * screen_height /
+ (device->abs.max_y - device->abs.min_y) +
+ device->output->y;
+ device->type |= EVDEV_ABSOLUTE_MOTION;
+ break;
+ }
+}
+
+static inline void
+evdev_process_absolute_motion_touchpad(struct evdev_input_device *device,
+ struct input_event *e)
+{
+ /* FIXME: Make this configurable somehow. */
+ const int touchpad_speed = 700;
+
+ switch (e->code) {
+ case ABS_X:
+ e->value -= device->abs.min_x;
+ if (device->abs.reset_x)
+ device->abs.reset_x = 0;
+ else {
+ device->rel.dx =
+ (e->value - device->abs.old_x) *
+ touchpad_speed /
+ (device->abs.max_x - device->abs.min_x);
+ }
+ device->abs.old_x = e->value;
+ device->type |= EVDEV_RELATIVE_MOTION;
+ break;
+ case ABS_Y:
+ e->value -= device->abs.min_y;
+ if (device->abs.reset_y)
+ device->abs.reset_y = 0;
+ else {
+ device->rel.dy =
+ (e->value - device->abs.old_y) *
+ touchpad_speed /
+ /* maybe use x size here to have the same scale? */
+ (device->abs.max_y - device->abs.min_y);
+ }
+ device->abs.old_y = e->value;
+ device->type |= EVDEV_RELATIVE_MOTION;
+ break;
+ }
+}
+
+static inline void
+evdev_process_relative_motion(struct evdev_input_device *device,
+ struct input_event *e)
+{
+ switch (e->code) {
+ case REL_X:
+ device->rel.dx += e->value;
+ device->type |= EVDEV_RELATIVE_MOTION;
+ break;
+ case REL_Y:
+ device->rel.dy += e->value;
+ device->type |= EVDEV_RELATIVE_MOTION;
+ break;
+ }
+}
+
+static inline void
+evdev_process_absolute(struct evdev_input_device *device,
+ struct input_event *e)
+{
+ if (device->is_touchpad) {
+ evdev_process_absolute_motion_touchpad(device, e);
+ } else if (device->is_mt) {
+ evdev_process_touch(device, e);
+ } else {
+ evdev_process_absolute_motion(device, e);
+ }
+}
+
+static int
+is_motion_event(struct input_event *e)
+{
+ switch (e->type) {
+ case EV_REL:
+ switch (e->code) {
+ case REL_X:
+ case REL_Y:
+ return 1;
+ }
+ case EV_ABS:
+ switch (e->code) {
+ case ABS_X:
+ case ABS_Y:
+ case ABS_MT_POSITION_X:
+ case ABS_MT_POSITION_Y:
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+static void
+evdev_flush_motion(struct evdev_input_device *device, uint32_t time)
+{
+ struct wl_input_device *master = &device->master->base.input_device;
+
+ if (!device->type)
+ return;
+
+ if (device->type & EVDEV_RELATIVE_MOTION) {
+ notify_motion(master, time,
+ master->x + device->rel.dx,
+ master->y + device->rel.dy);
+ device->type &= ~EVDEV_RELATIVE_MOTION;
+ device->rel.dx = 0;
+ device->rel.dy = 0;
+ }
+ if (device->type & EVDEV_ABSOLUTE_MT_DOWN) {
+ notify_touch(master, time,
+ device->mt.slot,
+ device->mt.x[device->mt.slot],
+ device->mt.y[device->mt.slot],
+ WL_INPUT_DEVICE_TOUCH_DOWN);
+ device->type &= ~EVDEV_ABSOLUTE_MT_DOWN;
+ device->type &= ~EVDEV_ABSOLUTE_MT_MOTION;
+ }
+ if (device->type & EVDEV_ABSOLUTE_MT_MOTION) {
+ notify_touch(master, time,
+ device->mt.slot,
+ device->mt.x[device->mt.slot],
+ device->mt.y[device->mt.slot],
+ WL_INPUT_DEVICE_TOUCH_MOTION);
+ device->type &= ~EVDEV_ABSOLUTE_MT_DOWN;
+ device->type &= ~EVDEV_ABSOLUTE_MT_MOTION;
+ }
+ if (device->type & EVDEV_ABSOLUTE_MT_UP) {
+ notify_touch(master, time, device->mt.slot, 0, 0,
+ WL_INPUT_DEVICE_TOUCH_UP);
+ device->type &= ~EVDEV_ABSOLUTE_MT_UP;
+ }
+ if (device->type & EVDEV_ABSOLUTE_MOTION) {
+ notify_motion(master, time, device->abs.x, device->abs.y);
+ device->type &= ~EVDEV_ABSOLUTE_MOTION;
+ }
+}
+
+static int
+evdev_input_device_data(int fd, uint32_t mask, void *data)
+{
+ struct weston_compositor *ec;
+ struct evdev_input_device *device = data;
+ struct input_event ev[8], *e, *end;
+ int len;
+ uint32_t time = 0;
+
+ ec = device->master->base.compositor;
+ if (!ec->focus)
+ return 1;
+
+ len = read(fd, &ev, sizeof ev);
+ if (len < 0 || len % sizeof e[0] != 0) {
+ /* FIXME: call device_removed when errno is ENODEV. */;
+ return 1;
+ }
+
+ e = ev;
+ end = (void *) ev + len;
+ for (e = ev; e < end; e++) {
+ time = e->time.tv_sec * 1000 + e->time.tv_usec / 1000;
+
+ /* we try to minimize the amount of notifications to be
+ * forwarded to the compositor, so we accumulate motion
+ * events and send as a bunch */
+ if (!is_motion_event(e))
+ evdev_flush_motion(device, time);
+ switch (e->type) {
+ case EV_REL:
+ evdev_process_relative_motion(device, e);
+ break;
+ case EV_ABS:
+ evdev_process_absolute(device, e);
+ break;
+ case EV_KEY:
+ evdev_process_key(device, e, time);
+ break;
+ }
+ }
+
+ evdev_flush_motion(device, time);
+
+ return 1;
+}
+
+
+/* copied from udev/extras/input_id/input_id.c */
+/* we must use this kernel-compatible implementation */
+#define BITS_PER_LONG (sizeof(unsigned long) * 8)
+#define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
+#define OFF(x) ((x)%BITS_PER_LONG)
+#define BIT(x) (1UL<<OFF(x))
+#define LONG(x) ((x)/BITS_PER_LONG)
+#define TEST_BIT(array, bit) ((array[LONG(bit)] >> OFF(bit)) & 1)
+/* end copied */
+
+static int
+evdev_configure_device(struct evdev_input_device *device)
+{
+ struct input_absinfo absinfo;
+ unsigned long ev_bits[NBITS(EV_MAX)];
+ unsigned long abs_bits[NBITS(ABS_MAX)];
+ unsigned long key_bits[NBITS(KEY_MAX)];
+ int has_key, has_abs;
+
+ has_key = 0;
+ has_abs = 0;
+
+ ioctl(device->fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
+ if (TEST_BIT(ev_bits, EV_ABS)) {
+ has_abs = 1;
+
+ ioctl(device->fd, EVIOCGBIT(EV_ABS, sizeof(abs_bits)),
+ abs_bits);
+ if (TEST_BIT(abs_bits, ABS_X)) {
+ ioctl(device->fd, EVIOCGABS(ABS_X), &absinfo);
+ device->abs.min_x = absinfo.minimum;
+ device->abs.max_x = absinfo.maximum;
+ }
+ if (TEST_BIT(abs_bits, ABS_Y)) {
+ ioctl(device->fd, EVIOCGABS(ABS_Y), &absinfo);
+ device->abs.min_y = absinfo.minimum;
+ device->abs.max_y = absinfo.maximum;
+ }
+ if (TEST_BIT(abs_bits, ABS_MT_SLOT)) {
+ device->is_mt = 1;
+ device->mt.slot = 0;
+ }
+ }
+ if (TEST_BIT(ev_bits, EV_KEY)) {
+ has_key = 1;
+ ioctl(device->fd, EVIOCGBIT(EV_KEY, sizeof(key_bits)),
+ key_bits);
+ if (TEST_BIT(key_bits, BTN_TOOL_FINGER) &&
+ !TEST_BIT(key_bits, BTN_TOOL_PEN))
+ device->is_touchpad = 1;
+ }
+
+ /* This rule tries to catch accelerometer devices and opt out. We may
+ * want to adjust the protocol later adding a proper event for dealing
+ * with accelerometers and implement here accordingly */
+ if (has_abs && !has_key)
+ return -1;
+
+ return 0;
+}
+
+static struct evdev_input_device *
+evdev_input_device_create(struct evdev_input *master,
+ struct wl_display *display, const char *path)
+{
+ struct evdev_input_device *device;
+ struct wl_event_loop *loop;
+ struct weston_compositor *ec;
+
+ device = malloc(sizeof *device);
+ if (device == NULL)
+ return NULL;
+
+ ec = master->base.compositor;
+ device->output =
+ container_of(ec->output_list.next, struct weston_output, link);
+
+ device->master = master;
+ device->is_touchpad = 0;
+ device->is_mt = 0;
+ device->devnode = strdup(path);
+ device->mt.slot = -1;
+ device->rel.dx = 0;
+ device->rel.dy = 0;
+
+ device->fd = open(path, O_RDONLY);
+ if (device->fd < 0)
+ goto err0;
+
+ if (evdev_configure_device(device) == -1)
+ goto err1;
+
+ loop = wl_display_get_event_loop(display);
+ device->source = wl_event_loop_add_fd(loop, device->fd,
+ WL_EVENT_READABLE,
+ evdev_input_device_data, device);
+ if (device->source == NULL)
+ goto err1;
+
+ wl_list_insert(master->devices_list.prev, &device->link);
+
+ return device;
+
+err1:
+ close(device->fd);
+err0:
+ free(device->devnode);
+ free(device);
+ return NULL;
+}
+
+static const char default_seat[] = "seat0";
+
+static void
+device_added(struct udev_device *udev_device, struct evdev_input *master)
+{
+ struct weston_compositor *c;
+ const char *devnode;
+ const char *device_seat;
+
+ device_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
+ if (!device_seat)
+ device_seat = default_seat;
+
+ if (strcmp(device_seat, master->seat_id))
+ return;
+
+ c = master->base.compositor;
+ devnode = udev_device_get_devnode(udev_device);
+ if (evdev_input_device_create(master, c->wl_display, devnode))
+ fprintf(stderr, "evdev input device: added: %s\n", devnode);
+}
+
+static void
+device_removed(struct udev_device *udev_device, struct evdev_input *master)
+{
+ const char *devnode = udev_device_get_devnode(udev_device);
+ struct evdev_input_device *device, *next;
+
+ wl_list_for_each_safe(device, next, &master->devices_list, link) {
+ if (!strcmp(device->devnode, devnode)) {
+ wl_event_source_remove(device->source);
+ wl_list_remove(&device->link);
+ close(device->fd);
+ free(device->devnode);
+ free(device);
+ break;
+ }
+ }
+ fprintf(stderr, "evdev input device: removed: %s\n", devnode);
+}
+
+void
+evdev_add_devices(struct udev *udev, struct weston_input_device *input_base)
+{
+ struct evdev_input *input = (struct evdev_input *) input_base;
+ struct udev_enumerate *e;
+ struct udev_list_entry *entry;
+ struct udev_device *device;
+ const char *path;
+
+ e = udev_enumerate_new(udev);
+ udev_enumerate_add_match_subsystem(e, "input");
+ udev_enumerate_scan_devices(e);
+ udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
+ path = udev_list_entry_get_name(entry);
+ device = udev_device_new_from_syspath(udev, path);
+
+ if (strncmp("event", udev_device_get_sysname(device), 5) != 0)
+ continue;
+
+ device_added(device, input);
+
+ udev_device_unref(device);
+ }
+ udev_enumerate_unref(e);
+}
+
+static int
+evdev_udev_handler(int fd, uint32_t mask, void *data)
+{
+ struct evdev_input *master = data;
+ struct udev_device *udev_device;
+ const char *action;
+
+ udev_device = udev_monitor_receive_device(master->udev_monitor);
+ if (!udev_device)
+ return 1;
+
+ action = udev_device_get_action(udev_device);
+ if (action) {
+ if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
+ return 0;
+
+ if (!strcmp(action, "add")) {
+ device_added(udev_device, master);
+ }
+ else if (!strcmp(action, "remove"))
+ device_removed(udev_device, master);
+ }
+ udev_device_unref(udev_device);
+
+ return 0;
+}
+
+static int
+evdev_config_udev_monitor(struct udev *udev, struct evdev_input *master)
+{
+ struct wl_event_loop *loop;
+ struct weston_compositor *c = master->base.compositor;
+
+ master->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
+ if (!master->udev_monitor)
+ return 0;
+
+ udev_monitor_filter_add_match_subsystem_devtype(master->udev_monitor,
+ "input", NULL);
+
+ if (udev_monitor_enable_receiving(master->udev_monitor)) {
+ fprintf(stderr, "udev: failed to bind the udev monitor\n");
+ return 0;
+ }
+
+ loop = wl_display_get_event_loop(c->wl_display);
+ wl_event_loop_add_fd(loop, udev_monitor_get_fd(master->udev_monitor),
+ WL_EVENT_READABLE, evdev_udev_handler, master);
+
+ return 1;
+}
+
+void
+evdev_input_create(struct weston_compositor *c, struct udev *udev,
+ const char *seat)
+{
+ struct evdev_input *input;
+
+ input = malloc(sizeof *input);
+ if (input == NULL)
+ return;
+
+ memset(input, 0, sizeof *input);
+ weston_input_device_init(&input->base, c);
+
+ wl_list_init(&input->devices_list);
+ input->seat_id = strdup(seat);
+ if (!evdev_config_udev_monitor(udev, input)) {
+ free(input->seat_id);
+ free(input);
+ return;
+ }
+
+ evdev_add_devices(udev, &input->base);
+
+ c->input_device = &input->base.input_device;
+}
+
+void
+evdev_remove_devices(struct weston_input_device *input_base)
+{
+ struct evdev_input *input = (struct evdev_input *) input_base;
+ struct evdev_input_device *device, *next;
+
+ wl_list_for_each_safe(device, next, &input->devices_list, link) {
+ fprintf(stderr, "evdev input device: removed: %s\n", device->devnode);
+ wl_event_source_remove(device->source);
+ wl_list_remove(&device->link);
+ close(device->fd);
+ free(device->devnode);
+ free(device);
+ }
+}
+
+void
+evdev_input_destroy(struct weston_input_device *input_base)
+{
+ struct evdev_input *input = (struct evdev_input *) input_base;
+
+ evdev_remove_devices(input_base);
+ wl_list_remove(&input->base.link);
+ free(input->seat_id);
+ free(input);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 23:40:20 +0000