656 lines
17 KiB
C
656 lines
17 KiB
C
#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <sys/stat.h>
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#include <linux/input.h>
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#include "udev.h"
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#include "udev_list.h"
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enum { BITS_MAX = 96 };
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struct udev_device {
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struct udev_list_entry properties;
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struct udev_list_entry sysattrs;
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struct udev_device *parent;
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struct udev *udev;
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int refcount;
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};
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const char *udev_device_get_syspath(struct udev_device *udev_device)
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{
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return udev_device_get_property_value(udev_device, "SYSPATH");
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}
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const char *udev_device_get_sysname(struct udev_device *udev_device)
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{
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return udev_device_get_property_value(udev_device, "SYSNAME");
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}
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const char *udev_device_get_sysnum(struct udev_device *udev_device)
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{
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return udev_device_get_property_value(udev_device, "SYSNUM");
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}
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const char *udev_device_get_devpath(struct udev_device *udev_device)
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{
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return udev_device_get_property_value(udev_device, "DEVPATH");
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}
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const char *udev_device_get_devnode(struct udev_device *udev_device)
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{
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return udev_device_get_property_value(udev_device, "DEVNAME");
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}
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dev_t udev_device_get_devnum(struct udev_device *udev_device)
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{
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const char *major, *minor;
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major = udev_device_get_property_value(udev_device, "MAJOR");
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minor = udev_device_get_property_value(udev_device, "MINOR");
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if (!major && !minor) {
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return makedev(0, 0);
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}
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return makedev(atoi(major), atoi(minor));
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}
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const char *udev_device_get_devtype(struct udev_device *udev_device)
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{
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return udev_device_get_property_value(udev_device, "DEVTYPE");
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}
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const char *udev_device_get_subsystem(struct udev_device *udev_device)
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{
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return udev_device_get_property_value(udev_device, "SUBSYSTEM");
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}
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const char *udev_device_get_driver(struct udev_device *udev_device)
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{
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return udev_device_get_property_value(udev_device, "DRIVER");
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}
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struct udev *udev_device_get_udev(struct udev_device *udev_device)
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{
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return udev_device ? udev_device->udev : NULL;
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}
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struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
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{
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char *path, *syspath;
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if (!udev_device) {
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return NULL;
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}
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syspath = strdup(udev_device_get_syspath(udev_device));
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if (!syspath) {
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return NULL;
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}
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path = syspath + 5;
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do {
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if ((path = strrchr(path, '/'))) {
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*path = '\0';
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}
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else {
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break;
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}
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udev_device->parent = udev_device_new_from_syspath(udev_device->udev, syspath);
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}
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while (!udev_device->parent);
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free(syspath);
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return udev_device->parent;
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}
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struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype)
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{
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const char *parent_subsystem, *parent_devtype;
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struct udev_device *parent;
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if (!udev_device || !subsystem) {
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return NULL;
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}
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parent = udev_device_get_parent(udev_device);
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while (parent) {
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parent_subsystem = udev_device_get_subsystem(parent);
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parent_devtype = udev_device_get_devtype(parent);
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if (parent_subsystem && strcmp(parent_subsystem, subsystem) == 0) {
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if (!devtype) {
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return parent;
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}
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if (parent_devtype && strcmp(parent_devtype, devtype) == 0) {
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return parent;
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}
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}
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parent = udev_device_get_parent(parent);
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}
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return NULL;
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}
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int udev_device_get_is_initialized(struct udev_device *udev_device)
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{
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return 1;
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}
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const char *udev_device_get_action(struct udev_device *udev_device)
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{
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return udev_device_get_property_value(udev_device, "ACTION");
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}
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int udev_device_has_tag(struct udev_device *udev_device, const char *tag)
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{
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// XXX NOT IMPLEMENTED
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return 0;
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}
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struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device)
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{
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// XXX NOT IMPLEMENTED
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return NULL;
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}
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struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device)
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{
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return udev_device ? udev_list_entry_get_next(&udev_device->properties) : NULL;
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}
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struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device)
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{
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// XXX NOT IMPLEMENTED
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return NULL;
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}
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struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_device *udev_device)
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{
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return udev_device ? udev_list_entry_get_next(&udev_device->sysattrs) : NULL;
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}
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const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key)
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{
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if (!udev_device || !key) {
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return NULL;
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}
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return udev_list_entry_get_value(udev_list_entry_get_by_name(&udev_device->properties, key));
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}
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const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr)
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{
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struct udev_list_entry *list_entry;
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char data[BUFSIZ], path[PATH_MAX];
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struct stat st;
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FILE *file;
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if (!udev_device || !sysattr) {
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return NULL;
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}
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list_entry = udev_list_entry_get_by_name(&udev_device->sysattrs, sysattr);
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if (list_entry) {
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return udev_list_entry_get_value(list_entry);
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}
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snprintf(path, sizeof(path), "%s/%s", udev_device_get_syspath(udev_device), sysattr);
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if (lstat(path, &st) != 0 || !S_ISREG(st.st_mode)) {
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return NULL;
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}
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file = fopen(path, "r");
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if (!file) {
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return NULL;
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}
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if (fread(data, 1, sizeof(data), file) != sizeof(data) && ferror(file)) {
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fclose(file);
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return NULL;
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}
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fclose(file);
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data[strcspn(data, "\n")] = '\0';
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list_entry = udev_list_entry_add(&udev_device->sysattrs, sysattr, data, 0);
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return udev_list_entry_get_value(list_entry);
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}
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int udev_device_set_sysattr_value(struct udev_device *udev_device, const char *sysattr, const char *value)
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{
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char path[PATH_MAX];
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struct stat st;
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size_t len;
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FILE *file;
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if (!udev_device || !sysattr || !value) {
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return -1;
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}
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snprintf(path, sizeof(path), "%s/%s", udev_device_get_syspath(udev_device), sysattr);
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if (lstat(path, &st) != 0 || !S_ISREG(st.st_mode)) {
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return -1;
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}
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file = fopen(path, "w");
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if (!file) {
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return -1;
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}
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len = strlen(value);
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if (fwrite(value, 1, len, file) != len) {
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fclose(file);
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return -1;
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}
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fclose(file);
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udev_list_entry_add(&udev_device->sysattrs, sysattr, value, 1);
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return 0;
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}
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static char *udev_device_read_symlink(struct udev_device *udev_device, const char *name)
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{
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char link[PATH_MAX], path[PATH_MAX];
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ssize_t len;
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snprintf(path, sizeof(path), "%s/%s", udev_device_get_syspath(udev_device), name);
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len = readlink(path, link, sizeof(link));
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if (len == -1) {
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return NULL;
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}
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link[len] = '\0';
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return strdup(strrchr(link, '/') + 1);
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}
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static void udev_device_set_properties_from_uevent(struct udev_device *udev_device)
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{
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char line[LINE_MAX], path[PATH_MAX];
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char *key, *val, devnode[PATH_MAX];
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FILE *file;
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snprintf(path, sizeof(path), "%s/uevent", udev_device_get_syspath(udev_device));
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file = fopen(path, "r");
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if (!file) {
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return;
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}
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while (fgets(line, sizeof(line), file)) {
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line[strcspn(line, "\n")] = '\0';
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if (strncmp(line, "DEVNAME", 7) == 0) {
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snprintf(devnode, sizeof(devnode), "/dev/%s", line + 8);
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udev_list_entry_add(&udev_device->properties, "DEVNAME", devnode, 0);
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}
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else if (strchr(line, '=')) {
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val = strchr(line, '=') + 1;
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key = line;
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key[strcspn(key, "=")] = '\0';
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udev_list_entry_add(&udev_device->properties, key, val, 1);
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}
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}
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fclose(file);
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}
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static int populate_bit(unsigned long *arr, const char *val)
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{
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char *bit, *bits, *save;
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int i;
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if (!val) {
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return 0;
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}
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bits = strdup(val);
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if (!bits) {
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return 0;
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}
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bit = strtok_r(bits, " ", &save);
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for (i = 0; bit && i < BITS_MAX; i++) {
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arr[i] = strtoul(bit, NULL, 16);
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bit = strtok_r(NULL, " ", &save);
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}
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free(bits);
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return i;
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}
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static int find_bit(unsigned long *arr, int cnt, int bit)
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{
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int i;
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if (!cnt) {
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return 0;
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}
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for (i = 0; i < cnt; i++) {
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if (arr[i] & (1UL << (bit % LONG_BIT))) {
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return 1;
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}
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}
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return 0;
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}
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static void udev_device_set_properties_from_evdev(struct udev_device *udev_device)
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{
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int ev_cnt, rel_cnt, key_cnt, abs_cnt, prop_cnt;
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unsigned long prop_bits[BITS_MAX] = {0};
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unsigned long abs_bits[BITS_MAX] = {0};
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unsigned long rel_bits[BITS_MAX] = {0};
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unsigned long key_bits[BITS_MAX] = {0};
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unsigned long ev_bits[BITS_MAX] = {0};
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struct udev_device *tmp;
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const char *subsystem;
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subsystem = udev_device_get_subsystem(udev_device);
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if (!subsystem || strcmp(subsystem, "input") != 0) {
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return;
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}
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tmp = udev_device;
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while (1) {
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if (!tmp) {
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return;
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}
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if (udev_device_get_property_value(tmp, "EV")) {
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break;
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}
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tmp = udev_device_get_parent_with_subsystem_devtype(tmp, "input", NULL);
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}
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ev_cnt = populate_bit(ev_bits, udev_device_get_property_value(tmp, "EV"));
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abs_cnt = populate_bit(abs_bits, udev_device_get_property_value(tmp, "ABS"));
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rel_cnt = populate_bit(rel_bits, udev_device_get_property_value(tmp, "REL"));
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key_cnt = populate_bit(key_bits, udev_device_get_property_value(tmp, "KEY"));
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prop_cnt = populate_bit(prop_bits, udev_device_get_property_value(tmp, "PROP"));
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udev_list_entry_add(&udev_device->properties, "ID_INPUT", "1", 0);
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if (find_bit(prop_bits, prop_cnt, INPUT_PROP_POINTING_STICK)) {
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udev_list_entry_add(&udev_device->properties, "ID_INPUT_POINTINGSTICK", "1", 0);
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}
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if (find_bit(prop_bits, prop_cnt, INPUT_PROP_ACCELEROMETER)) {
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udev_list_entry_add(&udev_device->properties, "ID_INPUT_ACCELEROMETER", "1", 0);
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}
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if (find_bit(ev_bits, ev_cnt, EV_SW)) {
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udev_list_entry_add(&udev_device->properties, "ID_INPUT_SWITCH", "1", 0);
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}
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if (find_bit(ev_bits, ev_cnt, EV_REL)) {
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if (find_bit(rel_bits, rel_cnt, REL_Y) && find_bit(rel_bits, rel_cnt, REL_X) &&
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find_bit(key_bits, key_cnt, BTN_MOUSE)) {
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udev_list_entry_add(&udev_device->properties, "ID_INPUT_MOUSE", "1", 0);
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}
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}
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else if (find_bit(ev_bits, ev_cnt, EV_ABS)) {
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if (find_bit(key_bits, key_cnt, BTN_SELECT) || find_bit(key_bits, key_cnt, BTN_TR) ||
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find_bit(key_bits, key_cnt, BTN_START) || find_bit(key_bits, key_cnt, BTN_TL)) {
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udev_list_entry_add(&udev_device->properties, "ID_INPUT_JOYSTICK", "1", 0);
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}
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else if (find_bit(abs_bits, abs_cnt, ABS_Y) && find_bit(abs_bits, abs_cnt, ABS_X)) {
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if (find_bit(abs_bits, abs_cnt, ABS_Z) && !find_bit(ev_bits, ev_cnt, EV_KEY)) {
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udev_list_entry_add(&udev_device->properties, "ID_INPUT_ACCELEROMETER", "1", 0);
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}
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else if (find_bit(key_bits, key_cnt, BTN_STYLUS) || find_bit(key_bits, key_cnt, BTN_TOOL_PEN)) {
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udev_list_entry_add(&udev_device->properties, "ID_INPUT_TABLET", "1", 0);
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}
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else if (find_bit(key_bits, key_cnt, BTN_TOUCH)) {
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if (find_bit(key_bits, key_cnt, BTN_TOOL_FINGER)) {
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udev_list_entry_add(&udev_device->properties, "ID_INPUT_TOUCHPAD", "1", 0);
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}
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else {
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udev_list_entry_add(&udev_device->properties, "ID_INPUT_TOUCHSCREEN", "1", 0);
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}
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}
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else if (find_bit(key_bits, key_cnt, BTN_MOUSE)) {
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udev_list_entry_add(&udev_device->properties, "ID_INPUT_MOUSE", "1", 0);
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}
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}
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}
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else if (find_bit(ev_bits, ev_cnt, EV_KEY)) {
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udev_list_entry_add(&udev_device->properties, "ID_INPUT_KEY", "1", 0);
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if (find_bit(key_bits, key_cnt, KEY_ENTER)) {
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udev_list_entry_add(&udev_device->properties, "ID_INPUT_KEYBOARD", "1", 0);
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}
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}
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}
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struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
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{
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char path[PATH_MAX], file[PATH_MAX];
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char *subsystem, *driver, *sysname;
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struct udev_device *udev_device;
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int i;
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if (!udev || !syspath) {
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return NULL;
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}
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snprintf(file, sizeof(file), "%s/uevent", syspath);
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if (access(file, R_OK) == -1) {
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return NULL;
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}
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if (!realpath(syspath, path)) {
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return NULL;
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}
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udev_device = calloc(1, sizeof(struct udev_device));
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if (!udev_device) {
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return NULL;
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}
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udev_device->udev = udev;
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udev_device->refcount = 1;
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udev_device->parent = NULL;
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udev_list_entry_init(&udev_device->properties);
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udev_list_entry_init(&udev_device->sysattrs);
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udev_list_entry_add(&udev_device->properties, "SYSPATH", path, 0);
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udev_list_entry_add(&udev_device->properties, "DEVPATH", path + 4, 0);
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sysname = strrchr(path, '/') + 1;
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driver = udev_device_read_symlink(udev_device, "driver");
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subsystem = udev_device_read_symlink(udev_device, "subsystem");
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udev_list_entry_add(&udev_device->properties, "SUBSYSTEM", subsystem, 0);
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udev_list_entry_add(&udev_device->properties, "SYSNAME", sysname, 0);
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udev_list_entry_add(&udev_device->properties, "DRIVER", driver, 0);
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for (i = 0; sysname[i] != '\0'; i++) {
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if (sysname[i] >= '0' && sysname[i] <= '9') {
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udev_list_entry_add(&udev_device->properties, "SYSNUM", sysname + i, 0);
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break;
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}
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}
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udev_device_set_properties_from_uevent(udev_device);
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udev_device_set_properties_from_evdev(udev_device);
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|
|
|
free(driver);
|
|
free(subsystem);
|
|
return udev_device;
|
|
}
|
|
|
|
struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
|
|
{
|
|
char path[PATH_MAX];
|
|
|
|
if (!udev || !type || !devnum) {
|
|
return NULL;
|
|
}
|
|
|
|
switch (type) {
|
|
case 'c':
|
|
snprintf(path, sizeof(path), "/sys/dev/char/%d:%d", major(devnum), minor(devnum));
|
|
break;
|
|
case 'b':
|
|
snprintf(path, sizeof(path), "/sys/dev/block/%d:%d", major(devnum), minor(devnum));
|
|
break;
|
|
default:
|
|
return NULL;
|
|
}
|
|
|
|
return udev_device_new_from_syspath(udev, path);
|
|
}
|
|
|
|
struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
|
|
{
|
|
const char *fmt[] = { "/sys/bus/%s/devices/%s", "/sys/class/%s/%s", NULL };
|
|
char path[PATH_MAX];
|
|
int i;
|
|
|
|
if (!udev || !subsystem || !sysname) {
|
|
return NULL;
|
|
}
|
|
|
|
for (i = 0; fmt[i]; i++) {
|
|
snprintf(path, sizeof(path), fmt[i], subsystem, sysname);
|
|
|
|
if (access(path, R_OK) == 0) {
|
|
return udev_device_new_from_syspath(udev, path);
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct udev_device *udev_device_new_from_file(struct udev *udev, const char *path)
|
|
{
|
|
char line[LINE_MAX], tmp[PATH_MAX];
|
|
struct udev_device *udev_device;
|
|
char *key, *val, *sysname;
|
|
FILE *file;
|
|
int i;
|
|
|
|
udev_device = calloc(1, sizeof(struct udev_device));
|
|
|
|
if (!udev_device) {
|
|
return NULL;
|
|
}
|
|
|
|
udev_device->udev = udev;
|
|
udev_device->refcount = 1;
|
|
udev_device->parent = NULL;
|
|
|
|
udev_list_entry_init(&udev_device->properties);
|
|
udev_list_entry_init(&udev_device->sysattrs);
|
|
|
|
file = fopen(path, "r");
|
|
|
|
if (!file) {
|
|
return NULL;
|
|
}
|
|
|
|
while (fgets(line, sizeof(line), file)) {
|
|
line[strcspn(line, "\n")] = '\0';
|
|
|
|
if (strncmp(line, "DEVPATH", 7) == 0) {
|
|
snprintf(tmp, sizeof(tmp), "/sys%s", line + 8);
|
|
udev_list_entry_add(&udev_device->properties, "SYSPATH", tmp, 0);
|
|
udev_list_entry_add(&udev_device->properties, "DEVPATH", line + 8, 0);
|
|
}
|
|
else if (strncmp(line, "DEVNAME", 7) == 0) {
|
|
snprintf(tmp, sizeof(tmp), "/dev/%s", line + 8);
|
|
udev_list_entry_add(&udev_device->properties, "DEVNAME", tmp, 0);
|
|
}
|
|
else if (strchr(line, '=')) {
|
|
val = strchr(line, '=') + 1;
|
|
key = line;
|
|
key[strcspn(key, "=")] = '\0';
|
|
|
|
udev_list_entry_add(&udev_device->properties, key, val, 1);
|
|
}
|
|
}
|
|
|
|
fclose(file);
|
|
sysname = strrchr(udev_device_get_syspath(udev_device), '/');
|
|
|
|
for (i = 0; sysname[i] != '\0'; i++) {
|
|
if (sysname[i] >= '0' && sysname[i] <= '9') {
|
|
udev_list_entry_add(&udev_device->properties, "SYSNUM", sysname + i, 0);
|
|
break;
|
|
}
|
|
}
|
|
|
|
udev_list_entry_add(&udev_device->properties, "SYSNAME", sysname, 0);
|
|
udev_device_set_properties_from_evdev(udev_device);
|
|
return udev_device;
|
|
}
|
|
|
|
struct udev_device *udev_device_new_from_device_id(struct udev *udev, const char *id)
|
|
{
|
|
// XXX NOT IMPLEMENTED
|
|
return NULL;
|
|
}
|
|
|
|
struct udev_device *udev_device_new_from_environment(struct udev *udev)
|
|
{
|
|
// XXX NOT IMPLEMENTED
|
|
return NULL;
|
|
}
|
|
|
|
struct udev_device *udev_device_ref(struct udev_device *udev_device)
|
|
{
|
|
if (!udev_device) {
|
|
return NULL;
|
|
}
|
|
|
|
udev_device->refcount++;
|
|
return udev_device;
|
|
}
|
|
|
|
struct udev_device *udev_device_unref(struct udev_device *udev_device)
|
|
{
|
|
if (!udev_device) {
|
|
return NULL;
|
|
}
|
|
|
|
if (--udev_device->refcount > 0) {
|
|
return NULL;
|
|
}
|
|
|
|
if (udev_device->parent) {
|
|
udev_device_unref(udev_device->parent);
|
|
}
|
|
|
|
udev_list_entry_free_all(&udev_device->properties);
|
|
udev_list_entry_free_all(&udev_device->sysattrs);
|
|
|
|
free(udev_device);
|
|
return NULL;
|
|
}
|