extend linerequest flags

add BIAS_PULL_UP BIAS_PULL_DOWN BIAS_DISABLE which available since 5.5

https://elixir.bootlin.com/linux/v5.5/source/include/uapi/linux/gpio.h#L62

.gitignore

@@ -1,4 +1,6 @@
-
 /target/
 **/*.rs.bk
 Cargo.lock
+
+/.cargo
+/.vscode

Cargo.toml

@@ -27,6 +27,7 @@ tokio = { version = "1", features = ["io-std", "net"], optional = true }
 futures = { version = "0.3", optional = true }
 
 [dev-dependencies]
+ignore = "=0.4.20" # dep of `quicli`, make it compatible with rust 1.65.0
 quicli = "0.4"
 structopt = "0.3"
 anyhow = "1.0"

src/lib.rs

@@ -356,6 +356,13 @@ bitflags! {
         const ACTIVE_LOW = (1 << 2);
         const OPEN_DRAIN = (1 << 3);
         const OPEN_SOURCE = (1 << 4);
+        // https://elixir.bootlin.com/linux/v5.5/source/include/uapi/linux/gpio.h#L30
+        /// Available since Linux Kernel 5.5
+        const BIAS_PULL_UP = (1 << 5);
+        /// Available since Linux Kernel 5.5
+        const BIAS_PULL_DOWN = (1 << 6);
+        /// Available since Linux Kernel 5.5
+        const BIAS_PULL_DISABLE = (1 << 7);
     }
 }