biscuit

commit 82635955fef4815e9a383db76ed9aad24e16ddbe
parent ff895276c8c8aa367aa948c9037a26abb317c270
Author: Daniel Barlow <dan@telent.net>
Date:   Fri, 19 Jul 2024 23:41:52 +0100

add modemmanager service and udev rules to tag the modem parts

a surprisngly large number of the udev rules do turn out to
be actually needed. Ignore the pasted comments  about rpmsgexport,
even those ones are important

Diffstat:
M
configuration.nix
 | 
92
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------

1 file changed, 82 insertions(+), 10 deletions(-)
diff --git a/configuration.nix b/configuration.nix
@@ -75,7 +75,89 @@ in {
     fileSystems."/" = lib.mkDefault {
       autoResize = lib.mkForce false;
     };
+    services.udev.extraRules = ''
+ACTION!="add|change|move|bind", GOTO="mm_qcom_soc_end"
+
+# Process only known wwan, net and rpmsg ports
+SUBSYSTEM=="net",   DRIVERS=="bam-dmux",      GOTO="mm_qcom_soc_process"
+# SUBSYSTEM=="platform",   DRIVERS=="bam-dmux",      GOTO="mm_qcom_soc_process"
+SUBSYSTEM=="net",   DRIVERS=="ipa",           GOTO="mm_qcom_soc_process"
+SUBSYSTEM=="wwan",  DRIVERS=="qcom-q6v5-mss", GOTO="mm_qcom_soc_process"
+SUBSYSTEM=="rpmsg", DRIVERS=="qcom-q6v5-mss", GOTO="mm_qcom_soc_process"
+GOTO="mm_qcom_soc_end"
+
+LABEL="mm_qcom_soc_process"
+
+# Flag the port as being part of the SoC
+ENV{ID_MM_QCOM_SOC}="1"
+
+# #
+# # Add a common physdev UID to all ports in the Qualcomm SoC, so that they
+# # are all bound together to the same modem object.
+# #
+# # The MSM8916, MSM8974, .... Qualcomm SoCs use the combination of RPMSG/WWAN
+# # based control ports plus BAM-DMUX based network ports.
+# #
+ENV{ID_MM_PHYSDEV_UID}="qcom-soc"
+
+# port type hints for the rpmsgexport-ed ports
+SUBSYSTEM=="rpmsg", ATTR{name}=="DATA*", ATTR{name}=="*_CNTL", ENV{ID_MM_PORT_TYPE_QMI}="1"
+SUBSYSTEM=="rpmsg", ATTR{name}=="DATA*", ATTR{name}!="*_CNTL", ENV{ID_MM_PORT_TYPE_AT_SECONDARY}="1"
+
+# ignore every other port without explicit hints
+SUBSYSTEM=="rpmsg", ENV{ID_MM_PORT_TYPE_QMI}!="1", ENV{ID_MM_PORT_TYPE_AT_SECONDARY}!="1", ENV{ID_MM_PORT_IGNORE}="1"
+
+# explicitly ignore ports intended for USB tethering (DATA40, DATA40_CNTL)
+SUBSYSTEM=="rpmsg", ATTR{name}=="DATA40*", ENV{ID_MM_PORT_IGNORE}="1"
+KERNEL=="rmnet_usb*", ENV{ID_MM_PORT_IGNORE}="1"
+
+# flag all rpmsg ports under this plugin as candidate
+# KERNEL=="rpmsg*", SUBSYSTEM=="rpmsg", ENV{ID_MM_CANDIDATE}="1"
+KERNEL=="rpmsg*", SUBSYSTEM=="rpmsg", ENV{ID_MM_CANDIDATE}="1"
+
+LABEL="mm_qcom_soc_end"
+
+
+
+ACTION!="add|change|move|bind", GOTO="mm_candidate_end"
 
+# # Opening bound but disconnected Bluetooth RFCOMM ttys would initiate the
+# # connection. Don't do that.
+
+KERNEL=="rfcomm*", DEVPATH=="*/virtual/*", GOTO="mm_candidate_end" # */
+
+SUBSYSTEM=="net", ENV{ID_MM_CANDIDATE}="1"
+
+# WWAN subsystem port handling
+#  - All USB devices ignored for now, only PCI devices expected
+#  - Only "wwan_port" device types processed (single ports); we fully ignore
+#    the "wwan_dev" device type (full device, not just one port)
+
+SUBSYSTEMS=="usb", GOTO="mm_candidate_end"
+SUBSYSTEM=="wwan", ENV{DEVTYPE}=="wwan_dev", GOTO="mm_candidate_end"
+SUBSYSTEM=="wwan", ENV{ID_MM_CANDIDATE}="1"
+
+LABEL="mm_candidate_end"
+
+
+    '';
+    systemd.services.ModemManager = {
+      wantedBy = [ "multi-user.target" ];
+      serviceConfig =
+        let script = pkgs.writeScript "start-modem-manager" ''
+          #!${pkgs.bash}/bin/bash
+          source ${config.system.build.setEnvironment}
+          ${modemmanager_}/bin/ModemManager
+        '';
+        in  {
+          StandardInput = "journal";
+          StandardError = "journal";
+          StandardOutput = "journal";
+          SyslogIdentifier = "ModemManager";
+          ExecStart = script;
+          Restart = "always";
+        };
+    };
     networking = {
       useDHCP = true;
       hostName = "biscuit";
@@ -112,16 +194,6 @@ in {
 
     services.openssh.enable = true;
 
-    services.udev.extraRules = ''
-       SUBSYSTEM!="rpmsg", GOTO="qcom_rpmsg_end"
-       # symlink rpmsg endpoints under useful names
-       ATTR{name}=="DATA5_CNTL", SYMLINK+="modem"
-       # open SMD channels when the remoteproc comes up
-       KERNEL!="rpmsg_ctrl[0-9]*", GOTO="qcom_rpmsg_end"
-       ATTRS{rpmsg_name}!="modem|hexagon", GOTO="qcom_rpmsg_end"
-       ACTION=="add", RUN+="${rpmsgexport}/bin/rpmsgexport /dev/$name DATA5_CNTL"
-       LABEL="qcom_rpmsg_end"
-    '';
     environment.systemPackages = with pkgs; [ drm-framebuffer];
 
     users.users.dan = {