Add HL78XX Modem Driver Implementation Using Modem Chat Framework

boards/shields/swir_hl78xx_ev_kit/Kconfig.shield

@@ -0,0 +1,5 @@
+# Copyright (c) 2025 Netfeasa Ltd.
+# SPDX-License-Identifier: Apache-2.0
+
+config SHIELD_SWIR_HL78XX_EV_KIT
+	def_bool $(shields_list_contains,swir_hl78xx_ev_kit)

boards/shields/swir_hl78xx_ev_kit/doc/index.rst

@@ -0,0 +1,79 @@
+.. _swir_hl78xx_ev_kit:
+
+HL/RC Module Evaluation Kit Shield
+##################################
+
+Overview
+********
+
+Welcome to the HL78 module getting started guide.
+This guide will help you set up the evaluation kit (eval kit)
+for sending AT commands to the HL78 module and initiating data transmission.
+
+.. figure:: img/SW-Dev-RC76.3.webp
+   :align: center
+   :alt: HL/RC Module Evaluation Kit Shield Shield
+
+   HL/RC Module Evaluation Kit Shield Shield (Credit: Sierrra Wireless)
+
+More information about the shield can be found at the `HL/RC Module Evaluation Kit Shield guide website`_.
+
+Pins Assignment of HL/RC Module Evaluation Kit Shield Shield
+============================================================
++--------------------------+----------------------------------------------------------+
+| Shield Connector Pin     | Function                                                 |
++==========================+==========================================================+
+| CN403 alias              | UART 1 (with CTS and RTS pins)                           |
++--------------------------+----------------------------------------------------------+
+| CN303 alias              | SPI / UART 3                                             |
++--------------------------+----------------------------------------------------------+
+| CN1000 alias             | GPIO Test Pins                                           |
++--------------------------+----------------------------------------------------------+
+| GPIO6 CN1000_3           | LOW POWER MONITORING                                     |
++--------------------------+----------------------------------------------------------+
+| VGPIO alias              | Indirect indicator of hibernate mode entry/exit          |
++--------------------------+----------------------------------------------------------+
+| RESET CN1000_12          | RESET SIGNAL                                             |
++--------------------------+----------------------------------------------------------+
+| WAKE-UP CN1000_8         | SPI / UART 3                                             |
++--------------------------+----------------------------------------------------------+
+
+Please refer to the website for more information about HL/RC Module Evaluation Kit Shield Shield setup.
+.. _HL/RC Module Evaluation Kit Shield guide website:
+
+Checking Your Basic Configurations in PuTTY
+===========================================
+Before trying to set up a wired connection between the board and a host MCU,
+it's a good idea to first go through this list of basic AT commands over a
+USB COM port on a PC. For reference, you can find all the AT commands for the
+HL78xx modules in the Source.
+
+Requirements
+************
+
+This shield can be used with any boards which provides a configuration for
+header connectors and defines node aliases for UART, SPI and USB interfaces (see
+:ref:`shields` for more details).
+
+Programming
+***********
+
+Set ``--shield swir_hl78xx_ev_kit`` when you invoke ``west build``. For
+example:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/drivers/modem/hello_hl78xx
+   :board: st/nucleo_u575zi_q
+   :shield: swir_hl78xx_ev_kit
+   :goals: build
+
+References
+**********
+
+.. target-notes::
+
+.. _HL/RC Module Evaluation Kit Shield guide website:
+   https://source.sierrawireless.com/resources/airprime/development_kits/hl78xx-hl7900-development-kit-guide/
+
+.. _HL/RC Module Evaluation Kit Shield specification website:
+   https://info.sierrawireless.com/iot-modules-evaluation-kit#guide-for-the-hl78-series-evaluation-kit

boards/shields/swir_hl78xx_ev_kit/swir_hl78xx_ev_kit.overlay

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2025 Netfeasa Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		modem-uart = &usart2;
+		modem = &modem;
+	};
+};
+
+&usart2 {
+	pinctrl-0 = <&usart2_tx_pa2 &usart2_rx_pa3 &usart2_rts_pd4 &usart2_cts_pd3 >;
+	pinctrl-1 = <&analog_pa2 &analog_pa3 &analog_pd4 &analog_pd3 >;
+	dmas = <&gpdma1 0 27 STM32_DMA_PERIPH_TX
+		&gpdma1 1 26 STM32_DMA_PERIPH_RX>;
+	dma-names = "tx", "rx";
+	pinctrl-names = "default", "sleep";
+	current-speed = <115200>;
+	status = "okay";
+	hw-flow-control;
+	modem: hl_modem {
+		compatible = "swir,hl7812";
+		status = "okay";
+		mdm-reset-gpios = <&gpiod 5 (GPIO_ACTIVE_LOW)>;
+		mdm-wake-gpios = <&gpioe 15 (GPIO_ACTIVE_HIGH)>;
+		mdm-vgpio-gpios = <&gpiob 2 0>;
+		mdm-uart-cts-gpios = <&gpiod 3 0>;
+		mdm-gpio6-gpios = <&gpioa 8 0>;
+	};
+
+};

drivers/modem/CMakeLists.txt

@@ -35,5 +35,7 @@ if (CONFIG_MODEM_SIM7080)
 	zephyr_library_sources(simcom-sim7080.c)
 endif()
 
+add_subdirectory_ifdef(CONFIG_MODEM_HL78XX hl78xx)
+
 zephyr_library_sources_ifdef(CONFIG_MODEM_CELLULAR modem_cellular.c)
 zephyr_library_sources_ifdef(CONFIG_MODEM_AT_SHELL modem_at_shell.c)

drivers/modem/Kconfig

@@ -192,7 +192,7 @@ source "drivers/modem/Kconfig.quectel-bg9x"
 source "drivers/modem/Kconfig.wncm14a2a"
 source "drivers/modem/Kconfig.cellular"
 source "drivers/modem/Kconfig.at_shell"
-
+source "drivers/modem/hl78xx/Kconfig.hl78xx"
 source "drivers/modem/Kconfig.hl7800"
 source "drivers/modem/Kconfig.simcom-sim7080"
 

drivers/modem/hl78xx/CMakeLists.txt

@@ -0,0 +1,18 @@
+#
+#  Copyright (c) 2025 Netfeasa Ltd.
+#
+#  SPDX-License-Identifier: Apache-2.0
+#
+zephyr_library()
+
+zephyr_library_sources(
+    hl78xx.c
+    hl78xx_sockets.c
+    hl78xx_utility.c
+    hl78xx_apis.c
+)
+
+add_subdirectory_ifdef(CONFIG_HL78XX_EVT_MONITOR hl78xx_evt_monitor)
+
+zephyr_library_include_directories(${ZEPHYR_BASE}/subsys/net/ip)
+zephyr_library_include_directories(${ZEPHYR_BASE}/subsys/net/lib/sockets)