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add modemmanager service and udev rules to tag the modem parts

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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
This commit is contained in:
Daniel Barlow 2024-07-19 23:41:52 +01:00
parent ff895276c8
commit 82635955fe
1 changed files with 82 additions and 10 deletions
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92
configuration.nix
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@ -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 = {