config: add libudev input-hotplug backend

Add a backend using libudev for input hotplug, and disable the hal and
dbus backends if this one is enabled.

XKB configuration happens using xkb{rules,model,layout,variant,options}
properties (case-insensitive) on the device.  We fill in InputAttributes
to allow configuration through InputClass in Xorg.

Requires udev 148 for the input_id helper and ID_INPUT* properties.

Signed-off-by: Julien Cristau <jcristau@debian.org>
Acked-by: Dan Nicholson <dbn.lists@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>

1 files changed, 260 insertions, 0 deletions

diff --git a/config/udev.c b/config/udev.c
new file mode 100644
index 000000000..3ef0d7fb3
--- /dev/null
+++ b/config/udev.c
@@ -0,0 +1,260 @@
+/*
+ * Copyright © 2009 Julien Cristau
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Author: Julien Cristau <jcristau@debian.org>
+ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <libudev.h>
+
+#include "input.h"
+#include "inputstr.h"
+#include "hotplug.h"
+#include "config-backends.h"
+#include "os.h"
+
+#define UDEV_XKB_PROP_KEY "xkb"
+
+static struct udev_monitor *udev_monitor;
+
+static void
+device_added(struct udev_device *udev_device)
+{
+    const char *path, *name = NULL;
+    char *config_info = NULL;
+    const char *syspath;
+    const char *key, *value, *tmp;
+    InputOption *options = NULL, *tmpo;
+    InputAttributes attrs = {};
+    DeviceIntPtr dev = NULL;
+    struct udev_list_entry *set, *entry;
+    struct udev_device *parent;
+    int rc;
+
+    path = udev_device_get_devnode(udev_device);
+
+    syspath = udev_device_get_syspath(udev_device);
+
+    if (!path || !syspath)
+        return;
+
+    if (!udev_device_get_property_value(udev_device, "ID_INPUT"))
+        return;
+
+    options = xcalloc(sizeof(*options), 1);
+    if (!options)
+        return;
+
+    options->key = xstrdup("_source");
+    options->value = xstrdup("server/udev");
+    if (!options->key || !options->value)
+        goto unwind;
+
+    parent = udev_device_get_parent(udev_device);
+    if (parent)
+        name = udev_device_get_property_value(parent, "NAME");
+    if (!name)
+        name = "(unnamed)";
+    else
+        attrs.product = name;
+    add_option(&options, "name", name);
+
+    add_option(&options, "path", path);
+    add_option(&options, "device", path);
+    attrs.device = path;
+
+    config_info = Xprintf("udev:%s", syspath);
+    if (!config_info)
+        goto unwind;
+
+    if (device_is_duplicate(config_info)) {
+        LogMessage(X_WARNING, "config/udev: device %s already added. "
+                              "Ignoring.\n", name);
+        goto unwind;
+    }
+
+    set = udev_device_get_properties_list_entry(udev_device);
+    udev_list_entry_foreach(entry, set) {
+        key = udev_list_entry_get_name(entry);
+        if (!key)
+            continue;
+        value = udev_list_entry_get_value(entry);
+        if (!strncasecmp(key, UDEV_XKB_PROP_KEY,
+                                sizeof(UDEV_XKB_PROP_KEY) - 1)) {
+            tmp = key + sizeof(UDEV_XKB_PROP_KEY) - 1;
+            if (!strcasecmp(tmp, "rules"))
+                add_option(&options, "xkb_rules", value);
+            else if (!strcasecmp(tmp, "layout"))
+                add_option(&options, "xkb_layout", value);
+            else if (!strcasecmp(tmp, "variant"))
+                add_option(&options, "xkb_variant", value);
+            else if (!strcasecmp(tmp, "model"))
+                add_option(&options, "xkb_model", value);
+            else if (!strcasecmp(tmp, "options"))
+                add_option(&options, "xkb_options", value);
+        } else if (!strcmp(key, "ID_VENDOR")) {
+            attrs.vendor = value;
+        } else if (!strcmp(key, "ID_INPUT_KEY")) {
+            attrs.flags |= ATTR_KEYBOARD;
+        } else if (!strcmp(key, "ID_INPUT_MOUSE")) {
+            attrs.flags |= ATTR_POINTER;
+        } else if (!strcmp(key, "ID_INPUT_JOYSTICK")) {
+            attrs.flags |= ATTR_JOYSTICK;
+        } else if (!strcmp(key, "ID_INPUT_TABLET")) {
+            attrs.flags |= ATTR_TABLET;
+        } else if (!strcmp(key, "ID_INPUT_TOUCHPAD")) {
+            attrs.flags |= ATTR_TOUCHPAD;
+        } else if (!strcmp(key, "ID_INPUT_TOUCHSCREEN")) {
+            attrs.flags |= ATTR_TOUCHSCREEN;
+        }
+    }
+    LogMessage(X_INFO, "config/udev: Adding input device %s (%s)\n",
+               name, path);
+    rc = NewInputDeviceRequest(options, &attrs, &dev);
+    if (rc != Success)
+        goto unwind;
+
+    for (; dev; dev = dev->next) {
+        xfree(dev->config_info);
+        dev->config_info = xstrdup(config_info);
+    }
+
+ unwind:
+    xfree(config_info);
+    while (!dev && (tmpo = options)) {
+        options = tmpo->next;
+        xfree(tmpo->key);
+        xfree(tmpo->value);
+        xfree(tmpo);
+    }
+
+    return;
+}
+
+static void
+device_removed(struct udev_device *device)
+{
+    char *value;
+    const char *syspath = udev_device_get_syspath(device);
+
+    value = Xprintf("udev:%s", syspath);
+    if (!value)
+        return;
+
+    remove_devices("udev", value);
+
+    xfree(value);
+}
+
+static void
+wakeup_handler(pointer data, int err, pointer read_mask)
+{
+    int udev_fd = udev_monitor_get_fd(udev_monitor);
+    struct udev_device *udev_device;
+    const char *action;
+
+    if (err < 0)
+        return;
+
+    if (FD_ISSET(udev_fd, (fd_set *)read_mask)) {
+        udev_device = udev_monitor_receive_device(udev_monitor);
+        if (!udev_device)
+            return;
+        action = udev_device_get_action(udev_device);
+        if (action) {
+            if (!strcmp(action, "add"))
+                device_added(udev_device);
+            else if (!strcmp(action, "remove"))
+                device_removed(udev_device);
+        }
+        udev_device_unref(udev_device);
+    }
+}
+
+static void
+block_handler(pointer data, struct timeval **tv, pointer read_mask)
+{
+}
+
+int
+config_udev_init(void)
+{
+    struct udev *udev;
+    struct udev_enumerate *enumerate;
+    struct udev_list_entry *devices, *device;
+    int rc;
+
+    udev = udev_new();
+    if (!udev)
+        return 0;
+    udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
+    if (!udev_monitor)
+        return 0;
+    rc = udev_monitor_filter_add_match_subsystem_devtype(udev_monitor,
+                                                         "input", NULL);
+    if (rc < 0)
+        return 0;
+
+    if (udev_monitor_enable_receiving(udev_monitor)) {
+        ErrorF("config/udev: failed to bind the udev monitor\n");
+        return 0;
+    }
+
+    enumerate = udev_enumerate_new(udev);
+    if (!enumerate)
+        return 0;
+    udev_enumerate_add_match_subsystem(enumerate, "input");
+    udev_enumerate_scan_devices(enumerate);
+    devices = udev_enumerate_get_list_entry(enumerate);
+    udev_list_entry_foreach(device, devices) {
+        const char *syspath = udev_list_entry_get_name(device);
+        struct udev_device *udev_device = udev_device_new_from_syspath(udev, syspath);
+        device_added(udev_device);
+        udev_device_unref(udev_device);
+    }
+    udev_enumerate_unref(enumerate);
+
+    RegisterBlockAndWakeupHandlers(block_handler, wakeup_handler, NULL);
+    AddGeneralSocket(udev_monitor_get_fd(udev_monitor));
+
+    return 1;
+}
+
+void
+config_udev_fini(void)
+{
+    struct udev *udev;
+
+    if (!udev_monitor)
+        return;
+
+    udev = udev_monitor_get_udev(udev_monitor);
+
+    RemoveGeneralSocket(udev_monitor_get_fd(udev_monitor));
+    RemoveBlockAndWakeupHandlers(block_handler, wakeup_handler, udev_monitor);
+    udev_monitor_unref(udev_monitor);
+    udev_monitor = NULL;
+    udev_unref(udev);
+}