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How to use WPA_SUPPLICANT

Changes in wpa_suppliant and wireless driver folders are mandantory to add WPA_SUPPLICANT support to a new WiFi board.

Supplicant

Changes in external directory for a new WiFi board to include new chipset driver.

  1. Add new chipset driver under external/wpa_supplicant/src/drivers/, and name it as driver_<driver_name>.c

  2. Inside driver_<driver_name>.c, declare a driver structure variable named wpa_driver_<driver_name>_ops. wpa_driver_<driver_name>_ops is a strcuture of type wpa_driver_ops that is declared in external/wpa_supplicant/src/drivers/driver.h. The wpa_driver_ops structure contains function pointers to the specific WiFi driver that the supplicant links to.

  3. As an example, refer to the wpa_driver_t20_ops structure decalred in external/wpa_supplicant/src/drivers/driver_t20.c for the LSI WiFi chipset.

const struct wpa_driver_ops wpa_driver_t20_ops = {
	.name = "slsi_t20",
	.desc = "SLSI T20 Driver",
	.init2 = slsi_t20_init,
	.deinit = slsi_t20_deinit,
	.get_mac_addr = slsi_get_mac_addr,
	.get_capa = slsi_t20_get_capa,
	.scan2 = slsi_hw_scan,…
}
  1. Add the driver structure variable created in step 2 to the wpa_drivers[] list in external/wpa_supplicant/src/drivers/drivers.c, as shown below:
#ifdef CONFIG_DRIVER_\<DRIVER_NAME\>
extern struct wpa_driver_ops wpa_driver_\<driver_name\>_ops;	/* driver_\<driver_name\>.c */
#endif

This links the supplicant to the relevent WiFi driver.

  1. Make sure you have defined CONFIG_DRIVER_<DRIVER_NAME> using external/wpa_supplicant/Make.defs, as shown below:
CFLAGS += -DCONFIG_DRIVER_\<DRIVER_NAME\>

Driver

The WiFi driver needs to be initialized from the main board's initialization routine. An example initialization can be found under os/arch/arm/src/sidk_s5jt200/src/s5jt200_boot.c:

void board_initialize(void) { ...
#ifdef CONFIG_SCSC_WLAN
	slldbg("Initialize SCSC driver\n");
	slsi_driver_initialize();
#endif
}

Make sure you create your board-specific files at os/arch/arm/src/<board_name>/src/<board>_boot.c, and call the driver initialization function as shown in the example above.