update README and add install.sh

README.md

@@ -23,6 +23,21 @@ sudo dkms install cm4io-fan/0.1.0
 dtoverlay=cm4io-fan,minrpm=1000,maxrpm=5000
 ```
 
+## Install from git
+1. Install dkms if you haven't already:
+```
+sudo apt install dkms
+```
+2. Clone the repo
+```
+mkdir -p ~/src
+cd ~/src
+git clone https://github.com/neg2led/cm4io-fan.git
+cd cm4io-fan
+```
+3. Run install.sh, feel free to inspect it yourself first. It will archive the current HEAD to /usr/src with an appropriate version, and run DKMS.
+
+
 ## Config options
 The device tree overlay has a few options, here's the equivalent of a `/boot/overlays/README` info section:
 

install.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+set -e
+
+# version/name strings
+DRV_NAME="cm4io-fan"
+DRV_VERSION="0.1.0-1"
+
+# check kernel arch
+KERN_ARCH=$(uname -m)
+# uncomment this to override kernel arch check
+# I don't think this works on 32-bit, but maybe?
+#KERN_ARCH="aarch64"
+
+# kernel arch check
+if [[ ${KERN_ARCH} -ne "aarch64" ]]; then
+    echo "Error! aarch64 kernel not detected"
+    echo "If you'd like to continue anyway, uncomment the override in install.sh"
+    exit 1
+fi
+
+# make git archive the repo to the right spot
+git archive HEAD | tar -x -C "/usr/src/${DRV_NAME}-${DRV_VERSION}"
+
+# run dkms
+sudo dkms install "${DRV_NAME}/${DRV_VERSION}"
+
+# add line to /boot/config.txt
+if (grep -q "^dtoverlay=${DRV_NAME}" /boot/config.txt); then
+    echo "config.txt param already present"
+else
+    echo "Adding line to config.txt..."
+    sudo echo "dtoverlay=cm4io-fan,minrpm=500,maxrpm=2500" >> /boot/config.txt
+fi
+
+exit 0