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drivers/modem: Add generic cellular modem driver

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The added cellular modem driver is a naive driver, which
shall serve as a template for implementing tailored
drivers for modems like the UBLOX-R4. It uses only
generic at commands, described in 3gpp, and protocols,
like CMUX and PPP.

A binding for the BG95 has been added, which replaces
the quectel,bg9x. This is neccesary since the BG95 does
not have a usable reset pin, the reset and powerkey are
internally connected to each other.

Signed-off-by: Bjarki Arge Andreasen <baa@trackunit.com>
This commit is contained in:
Bjarki Arge Andreasen 2023-04-10 18:24:56 +02:00 • committed by Carles Cufí
commit b14c39f2c1
5 changed files with 1525 additions and 0 deletions
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2
drivers/modem/CMakeLists.txt
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@ -41,3 +41,5 @@ if (CONFIG_MODEM_SIM7080)
zephyr_library_include_directories(${ZEPHYR_BASE}/subsys/net/ip)
zephyr_library_sources(simcom-sim7080.c)
endif()
zephyr_library_sources_ifdef(CONFIG_MODEM_CELLULAR modem_cellular.c)

1
drivers/modem/Kconfig
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@ -190,6 +190,7 @@ source "drivers/modem/Kconfig.ublox-sara-r4"
source "drivers/modem/Kconfig.quectel-bg9x"
source "drivers/modem/Kconfig.wncm14a2a"
source "drivers/modem/Kconfig.gsm"
source "drivers/modem/Kconfig.cellular"
source "drivers/modem/Kconfig.hl7800"
source "drivers/modem/Kconfig.simcom-sim7080"

33
drivers/modem/Kconfig.cellular Normal file
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@ -0,0 +1,33 @@
# Copyright (c) 2023 Bjarki Arge Andreasen
# SPDX-License-Identifier: Apache-2.0
config MODEM_CELLULAR
bool "Generic cellular modem support"
select MODEM_MODULES
select MODEM_PPP
select MODEM_CMUX
select MODEM_CHAT
select MODEM_PIPE
select MODEM_BACKEND_UART
select RING_BUFFER
select NET_L2_PPP_OPTION_MRU
depends on (DT_HAS_QUECTEL_BG95_ENABLED || DT_HAS_ZEPHYR_GSM_PPP_ENABLED || \
DT_HAS_SIMCOM_SIM7080_ENABLED || DT_HAS_U_BLOX_SARA_R4_ENABLED || \
DT_HAS_SWIR_HL7800_ENABLED)
help
This driver uses the generic 3gpp AT commands, along
with the standard protocols CMUX and PPP, to configure
cellular modems to establish a point-to-point
network connection. It is a plug-in replacement for the
existing GSM_PPP driver, and a template for tailored
drivers for the ublox, quectel and other modems, which
include power management and more complex device specific
features.
if MODEM_CELLULAR
config MODEM_CELLULAR_APN
string "APN"
default "internet"
endif

1476
drivers/modem/modem_cellular.c Normal file
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File diff suppressed because it is too large Load diff

13
dts/bindings/modem/quectel,bg95.yaml Normal file
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@ -0,0 +1,13 @@
# Copyright (c) 2023 Bjarki Arge Andreasen
# SPDX-License-Identifier: Apache-2.0
description: Quectel BG95 modem
compatible: "quectel,bg95"
include: uart-device.yaml
properties:
mdm-power-gpios:
type: phandle-array
required: true