Wifi toggle for reMarkable 2 (#7122)

reMarkable 1 is no-op for the moment

frontend/device/remarkable/device.lua

@@ -130,6 +130,32 @@ end
 
 function Remarkable:supportsScreensaver() return true end
 
+function Remarkable:initNetworkManager(NetworkMgr)
+    function NetworkMgr:turnOnWifi(complete_callback)
+        os.execute("./enable-wifi.sh")
+        self:reconnectOrShowNetworkMenu(function()
+            self:connectivityCheck(1, complete_callback)
+        end)
+    end
+
+    function NetworkMgr:turnOffWifi(complete_callback)
+        os.execute("./disable-wifi.sh")
+        if complete_callback then
+            complete_callback()
+        end
+    end
+
+    function NetworkMgr:getNetworkInterfaceName()
+        return "wlan0"
+    end
+
+    NetworkMgr:setWirelessBackend("wpa_supplicant", {ctrl_interface = "/var/run/wpa_supplicant/wlan0"})
+
+    NetworkMgr.isWifiOn = function()
+        return NetworkMgr:isConnected()
+    end
+end
+
 function Remarkable:setDateTime(year, month, day, hour, min, sec)
     if hour == nil or min == nil then return true end
     local command
@@ -146,6 +172,9 @@ function Remarkable1:suspend()
 end
 
 function Remarkable2:suspend()
+    -- Need to remove brcmfmac kernel module before suspend. Otherwise the module crashes on wakeup
+    os.execute("./disable-wifi.sh")
+
     os.execute("systemctl suspend")
     -- While device is suspended, when the user presses the power button and wakes up the device,
     -- a "Power" event is NOT sent.

platform/remarkable/disable-wifi.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+# disable wifi and remove modules
+
+read -r MACHINE_TYPE <"/sys/devices/soc0/machine"
+
+if [ "reMarkable 2.0" = "${MACHINE_TYPE}" ]; then
+    # clean stop (if it's running) of main wpa_supplicant service, used by xochitl
+    systemctl stop wpa_supplicant
+    # clean stop of non-service wpa_supplicant, if running
+    wpa_cli terminate 2>/dev/null
+
+    # power down wifi interface
+    ifconfig wlan0 down 2>/dev/null
+
+    # remove module: IMPORTANT to do this before device suspends
+    modprobe -r brcmfmac 2>/dev/null
+fi

platform/remarkable/enable-wifi.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+read -r MACHINE_TYPE <"/sys/devices/soc0/machine"
+
+if [ "reMarkable 2.0" = "${MACHINE_TYPE}" ]; then
+    if lsmod | grep -q brcmfmac; then
+        ifconfig wlan0 up
+    else
+        modprobe brcmfmac
+    fi
+
+    # clean stop (if it's running) of main wpa_supplicant service, used by xochitl
+    systemctl stop wpa_supplicant
+    # clean stop of non-service wpa_supplicant, if running
+    wpa_cli terminate 2>/dev/null
+
+    sleep 1
+
+    wpa_supplicant -i wlan0 -C /var/run/wpa_supplicant -B 2>/dev/null
+fi