| Dominik Behr | 5239cca | 2016-01-21 18:22:04 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2016 The Chromium OS Authors. All rights reserved. |
| 3 | * Use of this source code is governed by a BSD-style license that can be |
| 4 | * found in the LICENSE file. |
| 5 | */ |
| 6 | |
| 7 | |
| 8 | #include <errno.h> |
| 9 | #include <libudev.h> |
| 10 | |
| 11 | #include "dev.h" |
| 12 | #include "input.h" |
| 13 | #include "util.h" |
| 14 | |
| 15 | static struct udev* udev = NULL; |
| 16 | static struct udev_monitor* udev_monitor = NULL; |
| 17 | static int udev_fd = -1; |
| 18 | |
| 19 | int dev_init(void) |
| 20 | { |
| 21 | udev = udev_new(); |
| 22 | if (!udev) |
| 23 | return -ENOENT; |
| 24 | |
| 25 | udev_monitor = udev_monitor_new_from_netlink(udev, "udev"); |
| 26 | if (!udev_monitor) { |
| 27 | udev_unref(udev); |
| 28 | udev = NULL; |
| 29 | return -ENOENT; |
| 30 | } |
| 31 | udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, "input", |
| 32 | NULL); |
| 33 | udev_monitor_enable_receiving(udev_monitor); |
| 34 | udev_fd = udev_monitor_get_fd(udev_monitor); |
| 35 | |
| 36 | dev_add_existing_input_devs(); |
| 37 | |
| 38 | return 0; |
| 39 | } |
| 40 | |
| 41 | void dev_close(void) |
| 42 | { |
| 43 | if (!udev_monitor) { |
| 44 | return; |
| 45 | } |
| 46 | udev_monitor_unref(udev_monitor); |
| 47 | udev_monitor = NULL; |
| 48 | udev_unref(udev); |
| 49 | udev = NULL; |
| 50 | udev_fd = -1; |
| 51 | } |
| 52 | |
| 53 | void dev_add_existing_input_devs(void) |
| 54 | { |
| 55 | struct udev_enumerate* udev_enum; |
| 56 | struct udev_list_entry* devices, *deventry; |
| 57 | udev_enum = udev_enumerate_new(udev); |
| 58 | udev_enumerate_add_match_subsystem(udev_enum, "input"); |
| 59 | udev_enumerate_scan_devices(udev_enum); |
| 60 | devices = udev_enumerate_get_list_entry(udev_enum); |
| 61 | udev_list_entry_foreach(deventry, devices) { |
| 62 | const char* syspath; |
| 63 | struct udev_device* dev; |
| 64 | syspath = udev_list_entry_get_name(deventry); |
| 65 | dev = udev_device_new_from_syspath(udev, syspath); |
| 66 | input_add(udev_device_get_devnode(dev)); |
| 67 | udev_device_unref(dev); |
| 68 | } |
| 69 | udev_enumerate_unref(udev_enum); |
| 70 | } |
| 71 | |
| 72 | void dev_add_fds(fd_set* read_set, fd_set* exception_set, int *maxfd) |
| 73 | { |
| 74 | FD_SET(udev_fd, read_set); |
| 75 | FD_SET(udev_fd, exception_set); |
| 76 | if (udev_fd > *maxfd) |
| 77 | *maxfd = udev_fd; |
| 78 | } |
| 79 | |
| 80 | void dev_dispatch_io(fd_set* read_set, fd_set* exception_set) |
| 81 | { |
| 82 | if (FD_ISSET(udev_fd, exception_set)) { |
| 83 | /* udev died on us? */ |
| 84 | LOG(ERROR, "Exception on udev fd"); |
| 85 | return; |
| 86 | } |
| 87 | |
| 88 | if (FD_ISSET(udev_fd, read_set) |
| 89 | && !FD_ISSET(udev_fd, exception_set)) { |
| 90 | /* we got an udev notification */ |
| 91 | struct udev_device* dev = |
| 92 | udev_monitor_receive_device(udev_monitor); |
| 93 | if (dev) { |
| 94 | if (!strcmp("add", udev_device_get_action(dev))) { |
| 95 | input_add(udev_device_get_devnode(dev)); |
| 96 | } else if (!strcmp("remove", |
| 97 | udev_device_get_action(dev))) { |
| 98 | input_remove(udev_device_get_devnode(dev)); |
| 99 | } |
| 100 | udev_device_unref(dev); |
| 101 | } |
| 102 | } |
| 103 | } |