The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <errno.h> |
| 18 | #include <stdio.h> |
| 19 | #include <stdlib.h> |
| 20 | #include <sys/stat.h> |
| 21 | #include <sys/types.h> |
| 22 | |
| 23 | #include <fcntl.h> |
| 24 | #include <dirent.h> |
| 25 | #include <unistd.h> |
| 26 | #include <string.h> |
| 27 | |
| 28 | #include <sys/socket.h> |
| 29 | #include <sys/un.h> |
| 30 | #include <linux/netlink.h> |
| 31 | #include <private/android_filesystem_config.h> |
| 32 | #include <sys/time.h> |
| 33 | #include <asm/page.h> |
| 34 | |
| 35 | #include "init.h" |
| 36 | #include "devices.h" |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame^] | 37 | #include "util.h" |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 38 | |
| 39 | #define CMDLINE_PREFIX "/dev" |
| 40 | #define SYSFS_PREFIX "/sys" |
| 41 | #define FIRMWARE_DIR "/etc/firmware" |
| 42 | #define MAX_QEMU_PERM 6 |
| 43 | |
Colin Cross | 0dd7ca6 | 2010-04-13 19:25:51 -0700 | [diff] [blame] | 44 | static int device_fd = -1; |
| 45 | |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 46 | struct uevent { |
| 47 | const char *action; |
| 48 | const char *path; |
| 49 | const char *subsystem; |
| 50 | const char *firmware; |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame^] | 51 | const char *partition_name; |
| 52 | int partition_num; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 53 | int major; |
| 54 | int minor; |
| 55 | }; |
| 56 | |
| 57 | static int open_uevent_socket(void) |
| 58 | { |
| 59 | struct sockaddr_nl addr; |
| 60 | int sz = 64*1024; // XXX larger? udev uses 16MB! |
| 61 | int s; |
| 62 | |
| 63 | memset(&addr, 0, sizeof(addr)); |
| 64 | addr.nl_family = AF_NETLINK; |
| 65 | addr.nl_pid = getpid(); |
| 66 | addr.nl_groups = 0xffffffff; |
| 67 | |
| 68 | s = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT); |
| 69 | if(s < 0) |
| 70 | return -1; |
| 71 | |
| 72 | setsockopt(s, SOL_SOCKET, SO_RCVBUFFORCE, &sz, sizeof(sz)); |
| 73 | |
| 74 | if(bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
| 75 | close(s); |
| 76 | return -1; |
| 77 | } |
| 78 | |
| 79 | return s; |
| 80 | } |
| 81 | |
| 82 | struct perms_ { |
| 83 | char *name; |
| 84 | mode_t perm; |
| 85 | unsigned int uid; |
| 86 | unsigned int gid; |
| 87 | unsigned short prefix; |
| 88 | }; |
| 89 | static struct perms_ devperms[] = { |
| 90 | { "/dev/null", 0666, AID_ROOT, AID_ROOT, 0 }, |
| 91 | { "/dev/zero", 0666, AID_ROOT, AID_ROOT, 0 }, |
| 92 | { "/dev/full", 0666, AID_ROOT, AID_ROOT, 0 }, |
| 93 | { "/dev/ptmx", 0666, AID_ROOT, AID_ROOT, 0 }, |
| 94 | { "/dev/tty", 0666, AID_ROOT, AID_ROOT, 0 }, |
| 95 | { "/dev/random", 0666, AID_ROOT, AID_ROOT, 0 }, |
| 96 | { "/dev/urandom", 0666, AID_ROOT, AID_ROOT, 0 }, |
| 97 | { "/dev/ashmem", 0666, AID_ROOT, AID_ROOT, 0 }, |
| 98 | { "/dev/binder", 0666, AID_ROOT, AID_ROOT, 0 }, |
| 99 | |
| 100 | /* logger should be world writable (for logging) but not readable */ |
| 101 | { "/dev/log/", 0662, AID_ROOT, AID_LOG, 1 }, |
| 102 | |
Dima Zavin | 46e8863 | 2009-08-03 17:08:25 -0700 | [diff] [blame] | 103 | /* the msm hw3d client device node is world writable/readable. */ |
| 104 | { "/dev/msm_hw3dc", 0666, AID_ROOT, AID_ROOT, 0 }, |
| 105 | |
Dima Zavin | 37b210f | 2009-08-10 16:34:04 -0700 | [diff] [blame] | 106 | /* gpu driver for adreno200 is globally accessible */ |
| 107 | { "/dev/kgsl", 0666, AID_ROOT, AID_ROOT, 0 }, |
| 108 | |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 109 | /* these should not be world writable */ |
Iliyan Malchev | 6ed11eb | 2009-08-05 09:50:12 -0700 | [diff] [blame] | 110 | { "/dev/diag", 0660, AID_RADIO, AID_RADIO, 0 }, |
| 111 | { "/dev/diag_arm9", 0660, AID_RADIO, AID_RADIO, 0 }, |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 112 | { "/dev/android_adb", 0660, AID_ADB, AID_ADB, 0 }, |
| 113 | { "/dev/android_adb_enable", 0660, AID_ADB, AID_ADB, 0 }, |
The Android Open Source Project | 35237d1 | 2008-12-17 18:08:08 -0800 | [diff] [blame] | 114 | { "/dev/ttyMSM0", 0600, AID_BLUETOOTH, AID_BLUETOOTH, 0 }, |
| 115 | { "/dev/ttyHS0", 0600, AID_BLUETOOTH, AID_BLUETOOTH, 0 }, |
Ken Schultz | be65da4 | 2009-07-15 17:01:47 -0500 | [diff] [blame] | 116 | { "/dev/uinput", 0660, AID_SYSTEM, AID_BLUETOOTH, 0 }, |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 117 | { "/dev/alarm", 0664, AID_SYSTEM, AID_RADIO, 0 }, |
The Android Open Source Project | 35237d1 | 2008-12-17 18:08:08 -0800 | [diff] [blame] | 118 | { "/dev/tty0", 0660, AID_ROOT, AID_SYSTEM, 0 }, |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 119 | { "/dev/graphics/", 0660, AID_ROOT, AID_GRAPHICS, 1 }, |
Dima Zavin | 46e8863 | 2009-08-03 17:08:25 -0700 | [diff] [blame] | 120 | { "/dev/msm_hw3dm", 0660, AID_SYSTEM, AID_GRAPHICS, 0 }, |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 121 | { "/dev/input/", 0660, AID_ROOT, AID_INPUT, 1 }, |
| 122 | { "/dev/eac", 0660, AID_ROOT, AID_AUDIO, 0 }, |
| 123 | { "/dev/cam", 0660, AID_ROOT, AID_CAMERA, 0 }, |
| 124 | { "/dev/pmem", 0660, AID_SYSTEM, AID_GRAPHICS, 0 }, |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 125 | { "/dev/pmem_adsp", 0660, AID_SYSTEM, AID_AUDIO, 1 }, |
| 126 | { "/dev/pmem_camera", 0660, AID_SYSTEM, AID_CAMERA, 1 }, |
| 127 | { "/dev/oncrpc/", 0660, AID_ROOT, AID_SYSTEM, 1 }, |
| 128 | { "/dev/adsp/", 0660, AID_SYSTEM, AID_AUDIO, 1 }, |
Sean McNeil | 102f6d2 | 2009-06-10 21:59:02 +0700 | [diff] [blame] | 129 | { "/dev/snd/", 0660, AID_SYSTEM, AID_AUDIO, 1 }, |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 130 | { "/dev/mt9t013", 0660, AID_SYSTEM, AID_SYSTEM, 0 }, |
Iliyan Malchev | fc0182e | 2009-05-01 10:25:05 -0700 | [diff] [blame] | 131 | { "/dev/msm_camera/", 0660, AID_SYSTEM, AID_SYSTEM, 1 }, |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 132 | { "/dev/akm8976_daemon",0640, AID_COMPASS, AID_SYSTEM, 0 }, |
| 133 | { "/dev/akm8976_aot", 0640, AID_COMPASS, AID_SYSTEM, 0 }, |
Iliyan Malchev | 9a52eda | 2009-06-25 16:47:31 -0700 | [diff] [blame] | 134 | { "/dev/akm8973_daemon",0640, AID_COMPASS, AID_SYSTEM, 0 }, |
| 135 | { "/dev/akm8973_aot", 0640, AID_COMPASS, AID_SYSTEM, 0 }, |
| 136 | { "/dev/bma150", 0640, AID_COMPASS, AID_SYSTEM, 0 }, |
Iliyan Malchev | 3306e06 | 2009-07-07 19:42:46 -0700 | [diff] [blame] | 137 | { "/dev/cm3602", 0640, AID_COMPASS, AID_SYSTEM, 0 }, |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 138 | { "/dev/akm8976_pffd", 0640, AID_COMPASS, AID_SYSTEM, 0 }, |
Iliyan Malchev | 3bc1e9c | 2009-08-13 11:08:34 -0700 | [diff] [blame] | 139 | { "/dev/lightsensor", 0640, AID_SYSTEM, AID_SYSTEM, 0 }, |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 140 | { "/dev/msm_pcm_out", 0660, AID_SYSTEM, AID_AUDIO, 1 }, |
| 141 | { "/dev/msm_pcm_in", 0660, AID_SYSTEM, AID_AUDIO, 1 }, |
| 142 | { "/dev/msm_pcm_ctl", 0660, AID_SYSTEM, AID_AUDIO, 1 }, |
The Android Open Source Project | 5ae090e | 2009-01-09 17:51:25 -0800 | [diff] [blame] | 143 | { "/dev/msm_snd", 0660, AID_SYSTEM, AID_AUDIO, 1 }, |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 144 | { "/dev/msm_mp3", 0660, AID_SYSTEM, AID_AUDIO, 1 }, |
Brian Swetland | c822213 | 2009-09-01 17:23:07 -0700 | [diff] [blame] | 145 | { "/dev/audience_a1026", 0660, AID_SYSTEM, AID_AUDIO, 1 }, |
Iliyan Malchev | 1340a09 | 2010-02-02 13:57:07 -0800 | [diff] [blame] | 146 | { "/dev/tpa2018d1", 0660, AID_SYSTEM, AID_AUDIO, 1 }, |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 147 | { "/dev/msm_audpre", 0660, AID_SYSTEM, AID_AUDIO, 0 }, |
Brian Swetland | c822213 | 2009-09-01 17:23:07 -0700 | [diff] [blame] | 148 | { "/dev/msm_audio_ctl", 0660, AID_SYSTEM, AID_AUDIO, 0 }, |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 149 | { "/dev/htc-acoustic", 0660, AID_SYSTEM, AID_AUDIO, 0 }, |
Dima Zavin | c840167 | 2009-08-31 13:40:23 -0700 | [diff] [blame] | 150 | { "/dev/vdec", 0660, AID_SYSTEM, AID_AUDIO, 0 }, |
Dima Zavin | 8234aa3 | 2009-09-28 14:39:56 -0700 | [diff] [blame] | 151 | { "/dev/q6venc", 0660, AID_SYSTEM, AID_AUDIO, 0 }, |
Masaki Sato | 1ccef18 | 2009-05-29 17:18:01 -0500 | [diff] [blame] | 152 | { "/dev/snd/dsp", 0660, AID_SYSTEM, AID_AUDIO, 0 }, |
| 153 | { "/dev/snd/dsp1", 0660, AID_SYSTEM, AID_AUDIO, 0 }, |
| 154 | { "/dev/snd/mixer", 0660, AID_SYSTEM, AID_AUDIO, 0 }, |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 155 | { "/dev/smd0", 0640, AID_RADIO, AID_RADIO, 0 }, |
Jack Veenstra | 4a76235 | 2009-05-05 11:48:17 -0700 | [diff] [blame] | 156 | { "/dev/qemu_trace", 0666, AID_SYSTEM, AID_SYSTEM, 0 }, |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 157 | { "/dev/qmi", 0640, AID_RADIO, AID_RADIO, 0 }, |
| 158 | { "/dev/qmi0", 0640, AID_RADIO, AID_RADIO, 0 }, |
| 159 | { "/dev/qmi1", 0640, AID_RADIO, AID_RADIO, 0 }, |
| 160 | { "/dev/qmi2", 0640, AID_RADIO, AID_RADIO, 0 }, |
Erik Gilling | e910ea5 | 2009-05-08 15:41:30 -0700 | [diff] [blame] | 161 | /* CDMA radio interface MUX */ |
| 162 | { "/dev/ts0710mux", 0640, AID_RADIO, AID_RADIO, 1 }, |
Chia-chi Yeh | 88dc657 | 2009-06-19 14:59:08 +0800 | [diff] [blame] | 163 | { "/dev/ppp", 0660, AID_RADIO, AID_VPN, 0 }, |
| 164 | { "/dev/tun", 0640, AID_VPN, AID_VPN, 0 }, |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 165 | { NULL, 0, 0, 0, 0 }, |
| 166 | }; |
| 167 | |
| 168 | /* devperms_partners list and perm_node are for hardware specific /dev entries */ |
| 169 | struct perm_node { |
| 170 | struct perms_ dp; |
| 171 | struct listnode plist; |
| 172 | }; |
| 173 | list_declare(devperms_partners); |
| 174 | |
| 175 | /* |
| 176 | * Permission override when in emulator mode, must be parsed before |
| 177 | * system properties is initalized. |
| 178 | */ |
| 179 | static int qemu_perm_count; |
| 180 | static struct perms_ qemu_perms[MAX_QEMU_PERM + 1]; |
| 181 | |
| 182 | int add_devperms_partners(const char *name, mode_t perm, unsigned int uid, |
| 183 | unsigned int gid, unsigned short prefix) { |
| 184 | int size; |
| 185 | struct perm_node *node = malloc(sizeof (struct perm_node)); |
| 186 | if (!node) |
| 187 | return -ENOMEM; |
| 188 | |
| 189 | size = strlen(name) + 1; |
| 190 | if ((node->dp.name = malloc(size)) == NULL) |
| 191 | return -ENOMEM; |
| 192 | |
| 193 | memcpy(node->dp.name, name, size); |
| 194 | node->dp.perm = perm; |
| 195 | node->dp.uid = uid; |
| 196 | node->dp.gid = gid; |
| 197 | node->dp.prefix = prefix; |
| 198 | |
| 199 | list_add_tail(&devperms_partners, &node->plist); |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | void qemu_init(void) { |
| 204 | qemu_perm_count = 0; |
| 205 | memset(&qemu_perms, 0, sizeof(qemu_perms)); |
| 206 | } |
| 207 | |
| 208 | static int qemu_perm(const char* name, mode_t perm, unsigned int uid, |
| 209 | unsigned int gid, unsigned short prefix) |
| 210 | { |
| 211 | char *buf; |
| 212 | if (qemu_perm_count == MAX_QEMU_PERM) |
| 213 | return -ENOSPC; |
| 214 | |
| 215 | buf = malloc(strlen(name) + 1); |
| 216 | if (!buf) |
| 217 | return -errno; |
| 218 | |
| 219 | strlcpy(buf, name, strlen(name) + 1); |
| 220 | qemu_perms[qemu_perm_count].name = buf; |
| 221 | qemu_perms[qemu_perm_count].perm = perm; |
| 222 | qemu_perms[qemu_perm_count].uid = uid; |
| 223 | qemu_perms[qemu_perm_count].gid = gid; |
| 224 | qemu_perms[qemu_perm_count].prefix = prefix; |
| 225 | |
| 226 | qemu_perm_count++; |
| 227 | return 0; |
| 228 | } |
| 229 | |
| 230 | /* Permission overrides for emulator that are parsed from /proc/cmdline. */ |
| 231 | void qemu_cmdline(const char* name, const char *value) |
| 232 | { |
| 233 | char *buf; |
| 234 | if (!strcmp(name, "android.ril")) { |
| 235 | /* cmd line params currently assume /dev/ prefix */ |
| 236 | if (asprintf(&buf, CMDLINE_PREFIX"/%s", value) == -1) { |
| 237 | return; |
| 238 | } |
| 239 | INFO("nani- buf:: %s\n", buf); |
| 240 | qemu_perm(buf, 0660, AID_RADIO, AID_ROOT, 0); |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | static int get_device_perm_inner(struct perms_ *perms, const char *path, |
| 245 | unsigned *uid, unsigned *gid, mode_t *perm) |
| 246 | { |
| 247 | int i; |
| 248 | for(i = 0; perms[i].name; i++) { |
| 249 | |
| 250 | if(perms[i].prefix) { |
| 251 | if(strncmp(path, perms[i].name, strlen(perms[i].name))) |
| 252 | continue; |
| 253 | } else { |
| 254 | if(strcmp(path, perms[i].name)) |
| 255 | continue; |
| 256 | } |
| 257 | *uid = perms[i].uid; |
| 258 | *gid = perms[i].gid; |
| 259 | *perm = perms[i].perm; |
| 260 | return 0; |
| 261 | } |
| 262 | return -1; |
| 263 | } |
| 264 | |
| 265 | /* First checks for emulator specific permissions specified in /proc/cmdline. */ |
| 266 | static mode_t get_device_perm(const char *path, unsigned *uid, unsigned *gid) |
| 267 | { |
| 268 | mode_t perm; |
| 269 | |
| 270 | if (get_device_perm_inner(qemu_perms, path, uid, gid, &perm) == 0) { |
| 271 | return perm; |
| 272 | } else if (get_device_perm_inner(devperms, path, uid, gid, &perm) == 0) { |
| 273 | return perm; |
| 274 | } else { |
| 275 | struct listnode *node; |
| 276 | struct perm_node *perm_node; |
| 277 | struct perms_ *dp; |
| 278 | |
| 279 | /* Check partners list. */ |
| 280 | list_for_each(node, &devperms_partners) { |
| 281 | perm_node = node_to_item(node, struct perm_node, plist); |
| 282 | dp = &perm_node->dp; |
| 283 | |
| 284 | if (dp->prefix) { |
| 285 | if (strncmp(path, dp->name, strlen(dp->name))) |
| 286 | continue; |
| 287 | } else { |
| 288 | if (strcmp(path, dp->name)) |
| 289 | continue; |
| 290 | } |
| 291 | /* Found perm in partner list. */ |
| 292 | *uid = dp->uid; |
| 293 | *gid = dp->gid; |
| 294 | return dp->perm; |
| 295 | } |
| 296 | /* Default if nothing found. */ |
| 297 | *uid = 0; |
| 298 | *gid = 0; |
| 299 | return 0600; |
| 300 | } |
| 301 | } |
| 302 | |
| 303 | static void make_device(const char *path, int block, int major, int minor) |
| 304 | { |
| 305 | unsigned uid; |
| 306 | unsigned gid; |
| 307 | mode_t mode; |
| 308 | dev_t dev; |
| 309 | |
| 310 | if(major > 255 || minor > 255) |
| 311 | return; |
| 312 | |
| 313 | mode = get_device_perm(path, &uid, &gid) | (block ? S_IFBLK : S_IFCHR); |
| 314 | dev = (major << 8) | minor; |
Nick Pelly | 6405c69 | 2010-01-21 18:13:39 -0800 | [diff] [blame] | 315 | /* Temporarily change egid to avoid race condition setting the gid of the |
| 316 | * device node. Unforunately changing the euid would prevent creation of |
| 317 | * some device nodes, so the uid has to be set with chown() and is still |
| 318 | * racy. Fixing the gid race at least fixed the issue with system_server |
| 319 | * opening dynamic input devices under the AID_INPUT gid. */ |
| 320 | setegid(gid); |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 321 | mknod(path, mode, dev); |
Nick Pelly | 6405c69 | 2010-01-21 18:13:39 -0800 | [diff] [blame] | 322 | chown(path, uid, -1); |
| 323 | setegid(AID_ROOT); |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 324 | } |
| 325 | |
Chuck Tuffli | 1e07084 | 2008-12-15 14:26:56 -0800 | [diff] [blame] | 326 | #if LOG_UEVENTS |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 327 | |
| 328 | static inline suseconds_t get_usecs(void) |
| 329 | { |
| 330 | struct timeval tv; |
| 331 | gettimeofday(&tv, 0); |
| 332 | return tv.tv_sec * (suseconds_t) 1000000 + tv.tv_usec; |
| 333 | } |
| 334 | |
| 335 | #define log_event_print(x...) INFO(x) |
| 336 | |
| 337 | #else |
| 338 | |
| 339 | #define log_event_print(fmt, args...) do { } while (0) |
| 340 | #define get_usecs() 0 |
| 341 | |
| 342 | #endif |
| 343 | |
| 344 | static void parse_event(const char *msg, struct uevent *uevent) |
| 345 | { |
| 346 | uevent->action = ""; |
| 347 | uevent->path = ""; |
| 348 | uevent->subsystem = ""; |
| 349 | uevent->firmware = ""; |
| 350 | uevent->major = -1; |
| 351 | uevent->minor = -1; |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame^] | 352 | uevent->partition_name = NULL; |
| 353 | uevent->partition_num = -1; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 354 | |
| 355 | /* currently ignoring SEQNUM */ |
| 356 | while(*msg) { |
| 357 | if(!strncmp(msg, "ACTION=", 7)) { |
| 358 | msg += 7; |
| 359 | uevent->action = msg; |
| 360 | } else if(!strncmp(msg, "DEVPATH=", 8)) { |
| 361 | msg += 8; |
| 362 | uevent->path = msg; |
| 363 | } else if(!strncmp(msg, "SUBSYSTEM=", 10)) { |
| 364 | msg += 10; |
| 365 | uevent->subsystem = msg; |
| 366 | } else if(!strncmp(msg, "FIRMWARE=", 9)) { |
| 367 | msg += 9; |
| 368 | uevent->firmware = msg; |
| 369 | } else if(!strncmp(msg, "MAJOR=", 6)) { |
| 370 | msg += 6; |
| 371 | uevent->major = atoi(msg); |
| 372 | } else if(!strncmp(msg, "MINOR=", 6)) { |
| 373 | msg += 6; |
| 374 | uevent->minor = atoi(msg); |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame^] | 375 | } else if(!strncmp(msg, "PARTN=", 6)) { |
| 376 | msg += 6; |
| 377 | uevent->partition_num = atoi(msg); |
| 378 | } else if(!strncmp(msg, "PARTNAME=", 9)) { |
| 379 | msg += 9; |
| 380 | uevent->partition_name = msg; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 381 | } |
| 382 | |
| 383 | /* advance to after the next \0 */ |
| 384 | while(*msg++) |
| 385 | ; |
| 386 | } |
| 387 | |
| 388 | log_event_print("event { '%s', '%s', '%s', '%s', %d, %d }\n", |
| 389 | uevent->action, uevent->path, uevent->subsystem, |
| 390 | uevent->firmware, uevent->major, uevent->minor); |
| 391 | } |
| 392 | |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame^] | 393 | static char **parse_platform_block_device(struct uevent *uevent) |
| 394 | { |
| 395 | const char *driver; |
| 396 | const char *path; |
| 397 | char *slash; |
| 398 | int width; |
| 399 | char buf[256]; |
| 400 | char link_path[256]; |
| 401 | int fd; |
| 402 | int link_num = 0; |
| 403 | int ret; |
| 404 | char *p; |
| 405 | unsigned int size; |
| 406 | struct stat info; |
| 407 | |
| 408 | char **links = malloc(sizeof(char *) * 4); |
| 409 | if (!links) |
| 410 | return NULL; |
| 411 | memset(links, 0, sizeof(char *) * 4); |
| 412 | |
| 413 | /* Drop "/devices/platform/" */ |
| 414 | path = uevent->path; |
| 415 | driver = path + 18; |
| 416 | slash = strchr(driver, '/'); |
| 417 | if (!slash) |
| 418 | goto err; |
| 419 | width = slash - driver; |
| 420 | if (width <= 0) |
| 421 | goto err; |
| 422 | |
| 423 | snprintf(link_path, sizeof(link_path), "/dev/block/platform/%.*s", |
| 424 | width, driver); |
| 425 | |
| 426 | if (uevent->partition_name) { |
| 427 | p = strdup(uevent->partition_name); |
| 428 | sanitize(p); |
| 429 | if (asprintf(&links[link_num], "%s/by-name/%s", link_path, p) > 0) |
| 430 | link_num++; |
| 431 | else |
| 432 | links[link_num] = NULL; |
| 433 | free(p); |
| 434 | } |
| 435 | |
| 436 | if (uevent->partition_num >= 0) { |
| 437 | if (asprintf(&links[link_num], "%s/by-num/p%d", link_path, uevent->partition_num) > 0) |
| 438 | link_num++; |
| 439 | else |
| 440 | links[link_num] = NULL; |
| 441 | } |
| 442 | |
| 443 | slash = strrchr(path, '/'); |
| 444 | if (asprintf(&links[link_num], "%s/%s", link_path, slash + 1) > 0) |
| 445 | link_num++; |
| 446 | else |
| 447 | links[link_num] = NULL; |
| 448 | |
| 449 | return links; |
| 450 | |
| 451 | err: |
| 452 | free(links); |
| 453 | return NULL; |
| 454 | } |
| 455 | |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 456 | static void handle_device_event(struct uevent *uevent) |
| 457 | { |
| 458 | char devpath[96]; |
| 459 | char *base, *name; |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame^] | 460 | char **links = NULL; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 461 | int block; |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame^] | 462 | int i; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 463 | |
| 464 | /* if it's not a /dev device, nothing to do */ |
| 465 | if((uevent->major < 0) || (uevent->minor < 0)) |
| 466 | return; |
| 467 | |
| 468 | /* do we have a name? */ |
| 469 | name = strrchr(uevent->path, '/'); |
| 470 | if(!name) |
| 471 | return; |
| 472 | name++; |
| 473 | |
| 474 | /* too-long names would overrun our buffer */ |
| 475 | if(strlen(name) > 64) |
| 476 | return; |
| 477 | |
| 478 | /* are we block or char? where should we live? */ |
The Android Open Source Project | 35237d1 | 2008-12-17 18:08:08 -0800 | [diff] [blame] | 479 | if(!strncmp(uevent->subsystem, "block", 5)) { |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 480 | block = 1; |
| 481 | base = "/dev/block/"; |
| 482 | mkdir(base, 0755); |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame^] | 483 | if (!strncmp(uevent->path, "/devices/platform/", 18)) |
| 484 | links = parse_platform_block_device(uevent); |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 485 | } else { |
| 486 | block = 0; |
| 487 | /* this should probably be configurable somehow */ |
The Android Open Source Project | 35237d1 | 2008-12-17 18:08:08 -0800 | [diff] [blame] | 488 | if(!strncmp(uevent->subsystem, "graphics", 8)) { |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 489 | base = "/dev/graphics/"; |
| 490 | mkdir(base, 0755); |
The Android Open Source Project | 35237d1 | 2008-12-17 18:08:08 -0800 | [diff] [blame] | 491 | } else if (!strncmp(uevent->subsystem, "oncrpc", 6)) { |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 492 | base = "/dev/oncrpc/"; |
| 493 | mkdir(base, 0755); |
The Android Open Source Project | 35237d1 | 2008-12-17 18:08:08 -0800 | [diff] [blame] | 494 | } else if (!strncmp(uevent->subsystem, "adsp", 4)) { |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 495 | base = "/dev/adsp/"; |
| 496 | mkdir(base, 0755); |
Iliyan Malchev | fc0182e | 2009-05-01 10:25:05 -0700 | [diff] [blame] | 497 | } else if (!strncmp(uevent->subsystem, "msm_camera", 10)) { |
| 498 | base = "/dev/msm_camera/"; |
| 499 | mkdir(base, 0755); |
| 500 | } else if(!strncmp(uevent->subsystem, "input", 5)) { |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 501 | base = "/dev/input/"; |
| 502 | mkdir(base, 0755); |
The Android Open Source Project | 35237d1 | 2008-12-17 18:08:08 -0800 | [diff] [blame] | 503 | } else if(!strncmp(uevent->subsystem, "mtd", 3)) { |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 504 | base = "/dev/mtd/"; |
| 505 | mkdir(base, 0755); |
Xiaopeng Yang | 5bb44c8 | 2008-11-25 16:20:07 -0800 | [diff] [blame] | 506 | } else if(!strncmp(uevent->subsystem, "sound", 5)) { |
| 507 | base = "/dev/snd/"; |
| 508 | mkdir(base, 0755); |
The Android Open Source Project | 35237d1 | 2008-12-17 18:08:08 -0800 | [diff] [blame] | 509 | } else if(!strncmp(uevent->subsystem, "misc", 4) && |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 510 | !strncmp(name, "log_", 4)) { |
| 511 | base = "/dev/log/"; |
| 512 | mkdir(base, 0755); |
| 513 | name += 4; |
| 514 | } else |
| 515 | base = "/dev/"; |
| 516 | } |
| 517 | |
| 518 | snprintf(devpath, sizeof(devpath), "%s%s", base, name); |
| 519 | |
| 520 | if(!strcmp(uevent->action, "add")) { |
| 521 | make_device(devpath, block, uevent->major, uevent->minor); |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame^] | 522 | if (links) { |
| 523 | for (i = 0; links[i]; i++) |
| 524 | make_link(devpath, links[i]); |
| 525 | } |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 526 | } |
| 527 | |
| 528 | if(!strcmp(uevent->action, "remove")) { |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame^] | 529 | if (links) { |
| 530 | for (i = 0; links[i]; i++) |
| 531 | remove_link(devpath, links[i]); |
| 532 | } |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 533 | unlink(devpath); |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame^] | 534 | } |
| 535 | |
| 536 | if (links) { |
| 537 | for (i = 0; links[i]; i++) |
| 538 | free(links[i]); |
| 539 | free(links); |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 540 | } |
| 541 | } |
| 542 | |
| 543 | static int load_firmware(int fw_fd, int loading_fd, int data_fd) |
| 544 | { |
| 545 | struct stat st; |
| 546 | long len_to_copy; |
| 547 | int ret = 0; |
| 548 | |
| 549 | if(fstat(fw_fd, &st) < 0) |
| 550 | return -1; |
| 551 | len_to_copy = st.st_size; |
| 552 | |
| 553 | write(loading_fd, "1", 1); /* start transfer */ |
| 554 | |
| 555 | while (len_to_copy > 0) { |
| 556 | char buf[PAGE_SIZE]; |
| 557 | ssize_t nr; |
| 558 | |
| 559 | nr = read(fw_fd, buf, sizeof(buf)); |
| 560 | if(!nr) |
| 561 | break; |
| 562 | if(nr < 0) { |
| 563 | ret = -1; |
| 564 | break; |
| 565 | } |
| 566 | |
| 567 | len_to_copy -= nr; |
| 568 | while (nr > 0) { |
| 569 | ssize_t nw = 0; |
| 570 | |
| 571 | nw = write(data_fd, buf + nw, nr); |
| 572 | if(nw <= 0) { |
| 573 | ret = -1; |
| 574 | goto out; |
| 575 | } |
| 576 | nr -= nw; |
| 577 | } |
| 578 | } |
| 579 | |
| 580 | out: |
| 581 | if(!ret) |
| 582 | write(loading_fd, "0", 1); /* successful end of transfer */ |
| 583 | else |
| 584 | write(loading_fd, "-1", 2); /* abort transfer */ |
| 585 | |
| 586 | return ret; |
| 587 | } |
| 588 | |
| 589 | static void process_firmware_event(struct uevent *uevent) |
| 590 | { |
| 591 | char *root, *loading, *data, *file; |
| 592 | int l, loading_fd, data_fd, fw_fd; |
| 593 | |
| 594 | log_event_print("firmware event { '%s', '%s' }\n", |
| 595 | uevent->path, uevent->firmware); |
| 596 | |
| 597 | l = asprintf(&root, SYSFS_PREFIX"%s/", uevent->path); |
| 598 | if (l == -1) |
| 599 | return; |
| 600 | |
| 601 | l = asprintf(&loading, "%sloading", root); |
| 602 | if (l == -1) |
| 603 | goto root_free_out; |
| 604 | |
| 605 | l = asprintf(&data, "%sdata", root); |
| 606 | if (l == -1) |
| 607 | goto loading_free_out; |
| 608 | |
| 609 | l = asprintf(&file, FIRMWARE_DIR"/%s", uevent->firmware); |
| 610 | if (l == -1) |
| 611 | goto data_free_out; |
| 612 | |
| 613 | loading_fd = open(loading, O_WRONLY); |
| 614 | if(loading_fd < 0) |
| 615 | goto file_free_out; |
| 616 | |
| 617 | data_fd = open(data, O_WRONLY); |
| 618 | if(data_fd < 0) |
| 619 | goto loading_close_out; |
| 620 | |
| 621 | fw_fd = open(file, O_RDONLY); |
| 622 | if(fw_fd < 0) |
| 623 | goto data_close_out; |
| 624 | |
| 625 | if(!load_firmware(fw_fd, loading_fd, data_fd)) |
| 626 | log_event_print("firmware copy success { '%s', '%s' }\n", root, file); |
| 627 | else |
| 628 | log_event_print("firmware copy failure { '%s', '%s' }\n", root, file); |
| 629 | |
| 630 | close(fw_fd); |
| 631 | data_close_out: |
| 632 | close(data_fd); |
| 633 | loading_close_out: |
| 634 | close(loading_fd); |
| 635 | file_free_out: |
| 636 | free(file); |
| 637 | data_free_out: |
| 638 | free(data); |
| 639 | loading_free_out: |
| 640 | free(loading); |
| 641 | root_free_out: |
| 642 | free(root); |
| 643 | } |
| 644 | |
| 645 | static void handle_firmware_event(struct uevent *uevent) |
| 646 | { |
| 647 | pid_t pid; |
| 648 | |
| 649 | if(strcmp(uevent->subsystem, "firmware")) |
| 650 | return; |
| 651 | |
| 652 | if(strcmp(uevent->action, "add")) |
| 653 | return; |
| 654 | |
| 655 | /* we fork, to avoid making large memory allocations in init proper */ |
| 656 | pid = fork(); |
| 657 | if (!pid) { |
| 658 | process_firmware_event(uevent); |
| 659 | exit(EXIT_SUCCESS); |
| 660 | } |
| 661 | } |
| 662 | |
| 663 | #define UEVENT_MSG_LEN 1024 |
Colin Cross | 0dd7ca6 | 2010-04-13 19:25:51 -0700 | [diff] [blame] | 664 | void handle_device_fd() |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 665 | { |
| 666 | char msg[UEVENT_MSG_LEN+2]; |
| 667 | int n; |
| 668 | |
Colin Cross | 0dd7ca6 | 2010-04-13 19:25:51 -0700 | [diff] [blame] | 669 | while((n = recv(device_fd, msg, UEVENT_MSG_LEN, 0)) > 0) { |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 670 | struct uevent uevent; |
| 671 | |
| 672 | if(n == UEVENT_MSG_LEN) /* overflow -- discard */ |
| 673 | continue; |
| 674 | |
| 675 | msg[n] = '\0'; |
| 676 | msg[n+1] = '\0'; |
| 677 | |
| 678 | parse_event(msg, &uevent); |
| 679 | |
| 680 | handle_device_event(&uevent); |
| 681 | handle_firmware_event(&uevent); |
| 682 | } |
| 683 | } |
| 684 | |
| 685 | /* Coldboot walks parts of the /sys tree and pokes the uevent files |
| 686 | ** to cause the kernel to regenerate device add events that happened |
| 687 | ** before init's device manager was started |
| 688 | ** |
| 689 | ** We drain any pending events from the netlink socket every time |
| 690 | ** we poke another uevent file to make sure we don't overrun the |
| 691 | ** socket's buffer. |
| 692 | */ |
| 693 | |
Colin Cross | 0dd7ca6 | 2010-04-13 19:25:51 -0700 | [diff] [blame] | 694 | static void do_coldboot(DIR *d) |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 695 | { |
| 696 | struct dirent *de; |
| 697 | int dfd, fd; |
| 698 | |
| 699 | dfd = dirfd(d); |
| 700 | |
| 701 | fd = openat(dfd, "uevent", O_WRONLY); |
| 702 | if(fd >= 0) { |
| 703 | write(fd, "add\n", 4); |
| 704 | close(fd); |
Colin Cross | 0dd7ca6 | 2010-04-13 19:25:51 -0700 | [diff] [blame] | 705 | handle_device_fd(); |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 706 | } |
| 707 | |
| 708 | while((de = readdir(d))) { |
| 709 | DIR *d2; |
| 710 | |
| 711 | if(de->d_type != DT_DIR || de->d_name[0] == '.') |
| 712 | continue; |
| 713 | |
| 714 | fd = openat(dfd, de->d_name, O_RDONLY | O_DIRECTORY); |
| 715 | if(fd < 0) |
| 716 | continue; |
| 717 | |
| 718 | d2 = fdopendir(fd); |
| 719 | if(d2 == 0) |
| 720 | close(fd); |
| 721 | else { |
Colin Cross | 0dd7ca6 | 2010-04-13 19:25:51 -0700 | [diff] [blame] | 722 | do_coldboot(d2); |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 723 | closedir(d2); |
| 724 | } |
| 725 | } |
| 726 | } |
| 727 | |
Colin Cross | 0dd7ca6 | 2010-04-13 19:25:51 -0700 | [diff] [blame] | 728 | static void coldboot(const char *path) |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 729 | { |
| 730 | DIR *d = opendir(path); |
| 731 | if(d) { |
Colin Cross | 0dd7ca6 | 2010-04-13 19:25:51 -0700 | [diff] [blame] | 732 | do_coldboot(d); |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 733 | closedir(d); |
| 734 | } |
| 735 | } |
| 736 | |
Colin Cross | 0dd7ca6 | 2010-04-13 19:25:51 -0700 | [diff] [blame] | 737 | void device_init(void) |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 738 | { |
| 739 | suseconds_t t0, t1; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 740 | |
Colin Cross | 0dd7ca6 | 2010-04-13 19:25:51 -0700 | [diff] [blame] | 741 | device_fd = open_uevent_socket(); |
| 742 | if(device_fd < 0) |
| 743 | return; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 744 | |
Colin Cross | 0dd7ca6 | 2010-04-13 19:25:51 -0700 | [diff] [blame] | 745 | fcntl(device_fd, F_SETFD, FD_CLOEXEC); |
| 746 | fcntl(device_fd, F_SETFL, O_NONBLOCK); |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 747 | |
| 748 | t0 = get_usecs(); |
Colin Cross | 0dd7ca6 | 2010-04-13 19:25:51 -0700 | [diff] [blame] | 749 | coldboot("/sys/class"); |
| 750 | coldboot("/sys/block"); |
| 751 | coldboot("/sys/devices"); |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 752 | t1 = get_usecs(); |
| 753 | |
| 754 | log_event_print("coldboot %ld uS\n", ((long) (t1 - t0))); |
Colin Cross | 0dd7ca6 | 2010-04-13 19:25:51 -0700 | [diff] [blame] | 755 | } |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 756 | |
Colin Cross | 0dd7ca6 | 2010-04-13 19:25:51 -0700 | [diff] [blame] | 757 | int get_device_fd() |
| 758 | { |
| 759 | return device_fd; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 760 | } |