From d4058339fd3c3ffa71861db8145e0807e433f5cb Mon Sep 17 00:00:00 2001
From: Matt DeVillier <matt.devillier@gmail.com>
Date: Sun, 1 Dec 2019 12:45:14 -0600
Subject: [PATCH] Add function to downgrade touchpad firmware on EVE

Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
---
 firmware.sh | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 sources.sh  |  4 ++++
 2 files changed, 52 insertions(+)

diff --git a/firmware.sh b/firmware.sh
index 31fee3b..35df775 100644
--- a/firmware.sh
+++ b/firmware.sh
@@ -479,6 +479,45 @@ fi
 read -ep "Press [Enter] to return to the main menu."
 }
 
+#########################
+# Downgrade Touchpad FW #
+#########################
+function downgrade_touchpad_fw()
+{
+# offer to downgrade touchpad firmware on EVE
+if [[ "${device^^}" = "EVE" ]]; then
+    echo_green "\nDowngrade Touchpad Firmware"
+    echo_yellow "If you plan to run Windows on your Pixelbook, it is necessary to downgrade 
+the touchpad firmware, otherwise the touchpad will not work."
+    read -ep "Do you wish to downgrade the touchpad firmware?? [y/N] "
+    if [[ "$REPLY" = "y" || "$REPLY" = "Y" ]] ; then
+        # ensure firmware write protect disabled
+        [[ "$wpEnabled" = true ]] && { exit_red "\nHardware write-protect enabled, cannot downgrade touchpad firmware."; return 1; }
+        # download TP firmware
+        echo_yellow "\nDownloading touchpad firmware\n(${touchpad_eve_fw})"
+        curl -s -LO "${other_source}${touchpad_eve_fw}"
+        curl -s -LO "${other_source}${touchpad_eve_fw}.sha1"
+        #verify checksum on downloaded file
+        sha1sum -c ${touchpad_eve_fw}.sha1 --quiet > /dev/null 2>&1
+        if [[ $? -eq 0 ]]; then
+            # flash TP firmware
+            echo_green "Flashing touchpad firmware -- do not touch the touchpad while updating!"
+            ${flashromcmd} -p ec:type=tp -i EC_RW -w ${touchpad_eve_fw} -o /tmp/flashrom.log >/dev/null 2>&1
+            if [ $? -eq 0 ]; then
+                echo_green "Touchpad firmware successfully downgraded."
+                echo_yellow "Please reboot your Pixelbook now."
+            else 
+                echo_red "Error flashing touchpad firmware:"
+                cat /tmp/flashrom.log
+                echo_yellow "\nThis function sometimes doesn't work under Linux, in which case it is\nrecommended to try under ChromiumOS."
+            fi
+        else
+            echo_red "Touchpad firmware download checksum fail; download corrupted, cannot flash."
+        fi
+        read -ep "Press [Enter] to return to the main menu."
+    fi
+fi
+}
 
 ##########################
 # Restore Stock Firmware #
@@ -1161,6 +1200,9 @@ function menu_fwupdate() {
     else
         echo -e "${GRAY_TEXT}**     ${GRAY_TEXT} 3)${GRAY_TEXT} Install/Update Full ROM Firmware${NORMAL}"
     fi
+    if [[ "${device^^}" = "EVE" ]]; then
+        echo -e "${MENU}**${WP_TEXT} [WP]${NUMBER} D)${MENU} Downgrade Touchpad Firmware ${NORMAL}"
+    fi
     if [[ "$unlockMenu" = true || ( "$isFullRom" = false && "$isBootStub" = false ) ]]; then
         echo -e "${MENU}**${WP_TEXT} [WP]${NUMBER} 4)${MENU} Set Boot Options (GBB flags) ${NORMAL}"
         echo -e "${MENU}**${WP_TEXT} [WP]${NUMBER} 5)${MENU} Set Hardware ID (HWID) ${NORMAL}"
@@ -1214,6 +1256,12 @@ function menu_fwupdate() {
             menu_fwupdate
             ;;
 
+        [dD])  if [[  "${device^^}" = "EVE" ]]; then
+                downgrade_touchpad_fw
+            fi
+            menu_fwupdate
+            ;;
+
         4)  if [[ "$unlockMenu" = true || "$isChromeOS" = true || "$isUnsupported" = false \
                     && "$isFullRom" = false && "$isBootStub" = false ]]; then
                 set_boot_options
diff --git a/sources.sh b/sources.sh
index a8054b8..a71f800 100644
--- a/sources.sh
+++ b/sources.sh
@@ -12,6 +12,7 @@ bootstub_source="https://www.mrchromebox.tech/files/firmware/boot_stub/"
 fullrom_source="https://www.mrchromebox.tech/files/firmware/full_rom/"
 shellball_source="https://www.mrchromebox.tech/files/firmware/shellball/"
 cbfs_source="https://www.mrchromebox.tech/files/firmware/cbfs/"
+other_source="https://www.mrchromebox.tech/files/firmware/other/"
 
 #LE sources
 LE_url_official="http://releases.libreelec.tv/"
@@ -138,3 +139,6 @@ coreboot_uefi_librem13v4="coreboot_tiano-librem13v4-mrchromebox_20191125.rom"
 coreboot_uefi_librem15v2="coreboot_tiano-librem15v2-mrchromebox_20191125.rom"
 coreboot_uefi_librem15v3="coreboot_tiano-librem15v3-mrchromebox_20191125.rom"
 coreboot_uefi_librem15v4="coreboot_tiano-librem15v4-mrchromebox_20191125.rom"
+
+# other
+touchpad_eve_fw="rose_v1.1.8546-ee1861e9e.bin"