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882e3c2680
xserver-multidpi/config/udev.c
Lennart Poettering 882e3c2680 config: process udev "changed" and "add" events in the same code paths 
udev gives no guarantee that before each "changed" event for a device
there's an "add" event, or that before each "remove" is an "add", or
that before each "add" there was no "add" already and so on. Users can
trigger these events at any time with "udevadm trigger", and netlink is
a lossy transport, hence the events can come in unexpected ordering.

With other words: regardless which event is generated, the X server must
not choke on it and make the best of it, hence make sure that if we get
an "add" event for an existing device we don't add the device a second
time.

Signed-off-by: Lennart Poettering <lennart@poettering.net>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
2011-07-27 09:29:39 +10:00

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/*
* 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 <ctype.h>
#include "input.h"
#include "inputstr.h"
#include "hotplug.h"
#include "config-backends.h"
#include "os.h"
#define UDEV_XKB_PROP_KEY "xkb"
#define LOG_PROPERTY(path, prop, val) \
LogMessageVerb(X_INFO, 10, \
"config/udev: getting property %s on %s " \
"returned \"%s\"\n", \
(prop), (path), (val) ? (val) : "(null)")
#define LOG_SYSATTR(path, attr, val) \
LogMessageVerb(X_INFO, 10, \
"config/udev: getting attribute %s on %s " \
"returned \"%s\"\n", \
(attr), (path), (val) ? (val) : "(null)")
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 *tags_prop;
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")) {
LogMessageVerb(X_INFO, 10,
"config/udev: ignoring device %s without "
"property ID_INPUT set\n",
path);
return;
}
options = calloc(sizeof(*options), 1);
if (!options)
return;
options->key = strdup("_source");
options->value = strdup("server/udev");
if (!options->key || !options->value)
goto unwind;
parent = udev_device_get_parent(udev_device);
if (parent) {
const char *ppath = udev_device_get_devnode(parent);
const char *product = udev_device_get_property_value(parent, "PRODUCT");
const char *pnp_id = udev_device_get_sysattr_value(parent, "id");
unsigned int usb_vendor, usb_model;
name = udev_device_get_sysattr_value(parent, "name");
LOG_SYSATTR(ppath, "name", name);
if (!name) {
name = udev_device_get_property_value(parent, "NAME");
LOG_PROPERTY(ppath, "NAME", name);
}
if (pnp_id)
attrs.pnp_id = strdup(pnp_id);
LOG_SYSATTR(ppath, "id", pnp_id);
/* construct USB ID in lowercase hex - "0000:ffff" */
if (product && sscanf(product, "%*x/%4x/%4x/%*x", &usb_vendor, &usb_model) == 2) {
if (asprintf(&attrs.usb_id, "%04x:%04x", usb_vendor, usb_model)
== -1)
attrs.usb_id = NULL;
else
LOG_PROPERTY(path, "PRODUCT", product);
}
}
if (!name)
name = "(unnamed)";
else
attrs.product = strdup(name);
add_option(&options, "name", name);
add_option(&options, "path", path);
add_option(&options, "device", path);
if (path)
attrs.device = strdup(path);
tags_prop = udev_device_get_property_value(udev_device, "ID_INPUT.tags");
LOG_PROPERTY(path, "ID_INPUT.tags", tags_prop);
attrs.tags = xstrtokenize(tags_prop, ",");
if (asprintf(&config_info, "udev:%s", syspath) == -1) {
config_info = NULL;
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)) {
LOG_PROPERTY(path, key, value);
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")) {
LOG_PROPERTY(path, key, value);
attrs.vendor = strdup(value);
} else if (!strcmp(key, "ID_INPUT_KEY")) {
LOG_PROPERTY(path, key, value);
attrs.flags |= ATTR_KEYBOARD;
} else if (!strcmp(key, "ID_INPUT_MOUSE")) {
LOG_PROPERTY(path, key, value);
attrs.flags |= ATTR_POINTER;
} else if (!strcmp(key, "ID_INPUT_JOYSTICK")) {
LOG_PROPERTY(path, key, value);
attrs.flags |= ATTR_JOYSTICK;
} else if (!strcmp(key, "ID_INPUT_TABLET")) {
LOG_PROPERTY(path, key, value);
attrs.flags |= ATTR_TABLET;
} else if (!strcmp(key, "ID_INPUT_TOUCHPAD")) {
LOG_PROPERTY(path, key, value);
attrs.flags |= ATTR_TOUCHPAD;
} else if (!strcmp(key, "ID_INPUT_TOUCHSCREEN")) {
LOG_PROPERTY(path, key, value);
attrs.flags |= ATTR_TOUCHSCREEN;
}
}
add_option(&options, "config_info", config_info);
LogMessage(X_INFO, "config/udev: Adding input device %s (%s)\n",
name, path);
rc = NewInputDeviceRequest(options, &attrs, &dev);
if (rc != Success)
goto unwind;
unwind:
free(config_info);
while ((tmpo = options)) {
options = tmpo->next;
free(tmpo->key); /* NULL if dev != NULL */
free(tmpo->value); /* NULL if dev != NULL */
free(tmpo);
}
free(attrs.usb_id);
free(attrs.pnp_id);
free(attrs.product);
free(attrs.device);
free(attrs.vendor);
if (attrs.tags) {
char **tag = attrs.tags;
while (*tag) {
free(*tag);
tag++;
}
free(attrs.tags);
}
return;
}
static void
device_removed(struct udev_device *device)
{
char *value;
const char *syspath = udev_device_get_syspath(device);
if (asprintf(&value, "udev:%s", syspath) == -1)
return;
remove_devices("udev", value);
free(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") || !strcmp(action, "change")) {
device_removed(udev_device);
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;
udev = udev_new();
if (!udev)
return 0;
udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
if (!udev_monitor)
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_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, NULL);
udev_monitor_unref(udev_monitor);
udev_monitor = NULL;
udev_unref(udev);
}
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