reMarkable: More robust Wi-Fi scripts (#11287)

Fixing a bunch of issues in the process.

---------

Co-authored-by: gbyl <gbyl@users.noreply.github.com>

platform/remarkable/disable-wifi.sh

@@ -1,14 +1,24 @@
 #!/bin/sh
 
-# disable wifi and remove modules
+# stop wpa_supplicant service cleanly, used by xochitl
+if systemctl is-active -q wpa_supplicant; then
+    systemctl stop wpa_supplicant
+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
+# stop non-service wpa_supplicant cleanly
+if pidof wpa_supplicant; then
+    wpa_cli terminate
+fi
+
+# stop dhcpcd if not enabled
+if ! systemctl is-enabled -q dhcpcd; then
+    systemctl stop dhcpcd
+fi
 
 # power down wifi interface
-ifconfig wlan0 down 2>/dev/null
+ifconfig wlan0 down
 
-# remove module
-modprobe -r brcmfmac 2>/dev/null
+# unload brcmfmac kernel module
+if grep -q "^brcmfmac " "/proc/modules"; then
+    modprobe -r brcmfmac
+fi

platform/remarkable/enable-wifi.sh

@@ -1,19 +1,27 @@
 #!/bin/sh
 
-read -r MACHINE_TYPE <"/sys/devices/soc0/machine"
-if [ "reMarkable 2.0" = "${MACHINE_TYPE}" ]; then
-    if ! lsmod | grep -q brcmfmac; then
-        modprobe brcmfmac
-    fi
+# load brcmfmac kernel module
+if ! grep -q "^brcmfmac " "/proc/modules"; then
+    modprobe brcmfmac
+    sleep 1
 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
+# stop wpa_supplicant service cleanly, used by xochitl
+if systemctl is-active -q wpa_supplicant; then
+    systemctl stop wpa_supplicant
+fi
 
-sleep 1
+# stop non-service wpa_supplicant cleanly
+if pidof wpa_supplicant; then
+    wpa_cli terminate
+fi
 
+# power up wifi interface
 ifconfig wlan0 up
-wpa_supplicant -i wlan0 -C /var/run/wpa_supplicant -B 2>/dev/null
+
+# make sure dhcpcd is running
+if ! systemctl is-active -q dhcpcd; then
+    systemctl start dhcpcd
+fi
+
+wpa_supplicant -i wlan0 -C /var/run/wpa_supplicant -B