--- a/rust/Cargo.lock	Tue Mar 21 22:41:29 2017 +0800
+++ b/rust/Cargo.lock	Thu Mar 23 00:20:22 2017 +0800
@@ -16,6 +16,7 @@
  "serde 0.9.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 0.9.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 0.9.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sysfs_gpio 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-core 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-curl 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -47,6 +48,11 @@
 ]
 
 [[package]]
+name = "bitflags"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "byteorder"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -258,6 +264,19 @@
 ]
 
 [[package]]
+name = "nix"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "semver 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "num-traits"
 version = "0.1.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -350,11 +369,24 @@
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "rustc_version"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "semver 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "scoped-tls"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "semver"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "serde"
 version = "0.9.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -417,6 +449,15 @@
 ]
 
 [[package]]
+name = "sysfs_gpio"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "nix 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 0.1.80 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "thread-id"
 version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -572,6 +613,7 @@
 "checksum aho-corasick 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ca972c2ea5f742bfce5687b9aef75506a764f61d37f8f649047846a9686ddb66"
 "checksum aho-corasick 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "500909c4f87a9e52355b26626d890833e9e1d53ac566db76c36faa984b889699"
 "checksum base64 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "065a0ce220ab84d0b6d5ae3e7bb77232209519c366f51f946fe28c19e84989d0"
+"checksum bitflags 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8dead7461c1127cf637931a1e50934eb6eee8bff2f74433ac7909e9afcee04a3"
 "checksum byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c40977b0ee6b9885c9013cd41d9feffdd22deb3bb4dc3a71d901cc7a77de18c8"
 "checksum bytes 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "46112a0060ae15e3a3f9a445428a53e082b91215b744fa27a1948842f4a64b96"
 "checksum cfg-if 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "de1e760d7b6535af4241fca8bd8adf68e2e7edacc6b29f5d399050c5e48cf88c"
@@ -598,6 +640,7 @@
 "checksum mio 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)" = "aa30e3753079b08ce3d75cf3b44783e36fe0e1f64065f65c1d894d1688fb2580"
 "checksum miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8c1f2f3b1cf331de6896aabf6e9d55dca90356cc9960cca7eaaf408a355ae919"
 "checksum net2 0.2.27 (registry+https://github.com/rust-lang/crates.io-index)" = "18b9642ad6222faf5ce46f6966f59b71b9775ad5758c9e09fcf0a6c8061972b4"
+"checksum nix 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a7bb1da2be7da3cbffda73fc681d509ffd9e665af478d2bee1907cee0bc64b2"
 "checksum num-traits 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)" = "e1cbfa3781f3fe73dc05321bed52a06d2d491eaa764c52335cf4399f046ece99"
 "checksum num_cpus 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a18c392466409c50b87369414a2680c93e739aedeb498eb2bff7d7eb569744e2"
 "checksum openssl-probe 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "756d49c8424483a3df3b5d735112b4da22109ced9a8294f1f5cdf80fb3810919"
@@ -611,7 +654,9 @@
 "checksum regex-syntax 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "f9ec002c35e86791825ed294b50008eea9ddfc8def4420124fbc6b08db834957"
 "checksum regex-syntax 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2f9191b1f57603095f105d317e375d19b1c9c5c3185ea9633a99a6dcbed04457"
 "checksum rustc-serialize 0.3.23 (registry+https://github.com/rust-lang/crates.io-index)" = "684ce48436d6465300c9ea783b6b14c4361d6b8dcbb1375b486a69cc19e2dfb0"
+"checksum rustc_version 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "c5f5376ea5e30ce23c03eb77cbe4962b988deead10910c372b226388b594c084"
 "checksum scoped-tls 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f417c22df063e9450888a7561788e9bd46d3bb3c1466435b4eccb903807f147d"
+"checksum semver 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)" = "d4f410fedcf71af0345d7607d246e7ad15faaadd49d240ee3b24e5dc21a820ac"
 "checksum serde 0.9.11 (registry+https://github.com/rust-lang/crates.io-index)" = "a702319c807c016e51f672e5c77d6f0b46afddd744b5e437d6b8436b888b458f"
 "checksum serde_codegen_internals 0.14.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4d52006899f910528a10631e5b727973fe668f3228109d1707ccf5bad5490b6e"
 "checksum serde_derive 0.9.11 (registry+https://github.com/rust-lang/crates.io-index)" = "f15ea24bd037b2d64646b4d934fa99c649be66e3f7b29fb595a5543b212b1452"
@@ -620,6 +665,7 @@
 "checksum strsim 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b4d15c810519a91cf877e7e36e63fe068815c678181439f2f29e2562147c3694"
 "checksum syn 0.11.9 (registry+https://github.com/rust-lang/crates.io-index)" = "480c834701caba3548aa991e54677281be3a5414a9d09ddbdf4ed74a569a9d19"
 "checksum synom 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a393066ed9010ebaed60b9eafa373d4b1baac186dd7e008555b0f702b51945b6"
+"checksum sysfs_gpio 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "90fc056b3e1a0f1cd10de67b14b62b85dfe450134e87bd9af2f066981c6ebb75"
 "checksum thread-id 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a9539db560102d1cef46b8b78ce737ff0bb64e7e18d35b2a5688f7d097d0ff03"
 "checksum thread-id 3.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4437c97558c70d129e40629a5b385b3fb1ffac301e63941335e4d354081ec14a"
 "checksum thread_local 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "8576dbbfcaef9641452d5cf0df9b0e7eeab7694956dd33bb61515fb8f18cfdd5"