xm530: bring up the AltoBeam ATBM6032 USB WiFi chip

Some XM530 boards (e.g. IPC-RB-BLK530AI-0235P-AB0) carry an AltoBeam
ATBM6032 on USB (007a:8888) with a power-down gpio. Enable the existing
atbm60xx package (603x, USB) in the xm530 defconfig and add the
/etc/wireless/usb case for it: load the dwc OTG stack, toggle the PDN
regulator (the gpio comes from the wifipdn env, set per board, e.g. by a
builder profile customizer), then modprobe the driver; S40network applies
the MAC and runs ifup as for every other wlandev.

Supporting changes:
- re-run depmod in xiongmai-osdrv-xm530's target-finalize: the vendor
  kernel ships a modules.dep that only lists its own modules, leaving
  dwc_otg, wifi_pdn and atbm603x invisible to modprobe (same pattern as
  hisilicon-opensdk);
- install the vendor cfg80211 rewrite as cfg80211_xm711.ko instead of over
  the in-tree cfg80211, and load it from there in the 'wifi xm711'
  helper: atbm60xx (and the kernel-built mac80211) need the in-tree
  module at the canonical path, so both WiFi stacks stay usable in one
  image;
- pin atbm60xx to a fixed revision instead of moving HEAD.

A companion per-device profile in OpenIPC/builder
(xm530_lite_anbiux-a8b-3mp) sets wlandev, wifipdn and the upgrade url
automatically on first boot.

Author: valov-daniil

br-ext-chip-xiongmai/configs/xm530_lite_defconfig

@@ -65,3 +65,8 @@ BR2_PACKAGE_OPUS_OPENIPC=y
 BR2_PACKAGE_VTUND_OPENIPC=y
 BR2_PACKAGE_XIONGMAI_OSDRV_XM530=y
 BR2_PACKAGE_YAML_CLI=y
+
+# ATBM60XX WiFi: AltoBeam ATBM6032 USB chip (007a:8888) found on some XM530 boards
+BR2_PACKAGE_ATBM60XX=y
+BR2_PACKAGE_ATBM60XX_MODEL_603X=y
+BR2_PACKAGE_ATBM60XX_INTERFACE_USB=y

general/overlay/etc/wireless/usb

@@ -324,4 +324,14 @@ if [ "$1" = "rtl8188fu-t31-aoni-e97vj62" ]; then
   exit 0
 fi
 
+# XM530 AltoBeam ATBM6032 (USB 007a:8888); PDN gpio from the wifipdn env
+# (set per board, e.g. by the builder profile's customizer)
+if [ "$1" = "atbm603x-xm530-usb" ]; then
+	modprobe dwc_otg
+	pdn=$(fw_printenv -n wifipdn)
+	[ -n "$pdn" ] && modprobe wifi_pdn value="$pdn"
+	modprobe atbm603x_wifi_usb
+	exit 0
+fi
+
 exit 1

general/package/atbm60xx/atbm60xx.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 ATBM60XX_SITE = $(call github,openipc,atbm_60xx,$(ATBM60XX_VERSION))
-ATBM60XX_VERSION = HEAD
+ATBM60XX_VERSION = 5243746967626551d29dd17ebdc7c1e4659bfb17
 
 define ATBM60XX_INSTALL_TARGET_CMDS
 	$(INSTALL) -m 755 -d $(TARGET_DIR)/usr/share/atbm60xx_conf

general/package/xiongmai-osdrv-xm530/files/script/wifi

@@ -7,7 +7,7 @@ if [ "$WIFI" = "xm711" ]; then
     insmod /lib/modules/3.10.103+/xiongmai/dwc_otg.ko
     insmod /lib/modules/3.10.103+/xiongmai/wifi_pdn.ko value=96
     insmod /lib/modules/3.10.103+/xiongmai/compat.ko
-    insmod /lib/modules/3.10.103+/kernel/net/wireless/cfg80211.ko     # grab from original firmware
+    insmod /lib/modules/3.10.103+/kernel/net/wireless/cfg80211_xm711.ko     # vendor rewrite, kept off the in-tree cfg80211 path
     # insmod /lib/modules/3.10.103+/kernel/net/mac80211/mac80211.ko   # not used with grabbed cfg80211
     insmod /lib/modules/3.10.103+/xiongmai/xm711.ko
 fi

general/package/xiongmai-osdrv-xm530/xiongmai-osdrv-xm530.mk

@@ -21,9 +21,12 @@ define XIONGMAI_OSDRV_XM530_INSTALL_TARGET_CMDS
 	$(INSTALL) -m 644 -t $(TARGET_DIR)/lib/modules/3.10.103+/xiongmai $(XIONGMAI_OSDRV_XM530_PKGDIR)/files/kmod/usb/*.ko
 	$(INSTALL) -m 644 -t $(TARGET_DIR)/lib/modules/3.10.103+/xiongmai $(XIONGMAI_OSDRV_XM530_PKGDIR)/files/kmod/xm711/*.ko
 
-	# Dirty hack
+	# The backported cfg80211 is only needed by the xm711/lynx driver. Install
+	# it under its own name instead of over the in-tree cfg80211 at the
+	# canonical module path: atbm60xx builds against the in-tree module, and so
+	# does the kernel-built mac80211. `wifi xm711` loads the renamed copy.
 	$(INSTALL) -m 755 -d $(TARGET_DIR)/lib/modules/3.10.103+/kernel/net/wireless
-	$(INSTALL) -m 644 -t $(TARGET_DIR)/lib/modules/3.10.103+/kernel/net/wireless $(XIONGMAI_OSDRV_XM530_PKGDIR)/files/kmod/rewrite/cfg80211.ko
+	$(INSTALL) -m 644 $(XIONGMAI_OSDRV_XM530_PKGDIR)/files/kmod/rewrite/cfg80211.ko $(TARGET_DIR)/lib/modules/3.10.103+/kernel/net/wireless/cfg80211_xm711.ko
 
 	$(INSTALL) -m 755 -d $(TARGET_DIR)/usr/bin
 	$(INSTALL) -m 755 -t $(TARGET_DIR)/usr/bin $(XIONGMAI_OSDRV_XM530_PKGDIR)/files/script/load*
@@ -36,4 +39,15 @@ define XIONGMAI_OSDRV_XM530_INSTALL_TARGET_CMDS
 	$(INSTALL) -m 644 -t $(TARGET_DIR)/usr/lib/ $(XIONGMAI_OSDRV_XM530_PKGDIR)/files/lib/*.so
 endef
 
+# The vendor kernel ships a modules.dep that only lists its own modules, so
+# the xiongmai/ modules installed above (dwc_otg, wifi_pdn) and the atbm60xx
+# module are invisible to modprobe. LINUX_RUN_DEPMOD is already registered in
+# TARGET_FINALIZE_HOOKS (the linux package is processed before this one) and
+# has run by the time we get here; a second pass over the merged target makes
+# modprobe resolve the driver stack the wireless/usb cases rely on.
+define XIONGMAI_OSDRV_XM530_FINALIZE_MODULES
+	$(LINUX_RUN_DEPMOD)
+endef
+XIONGMAI_OSDRV_XM530_TARGET_FINALIZE_HOOKS += XIONGMAI_OSDRV_XM530_FINALIZE_MODULES
+
 $(eval $(generic-package))