dahdi-linux: forward-port to 6.18 kernel APIs, fix build flags, disable OSLEC

This patchset updates DAHDI 3.4.0 to build cleanly on Linux 6.18 and
modern OpenWrt toolchains. Changes include:

* Add kernel API compatibility shims:
  - Provide hrtimer_init() wrapper using hrtimer_setup()
  - Restore from_timer() helper
  - Map del_timer*() to timer_delete*() on >= 6.15, aligning with
    upstream PR #93[1].

* Replace deprecated EXTRA_CFLAGS with ccflags-y across all Kbuilds
  to match upstream kernel changes and resolve build failures. Relating
  to oct612x include paths using ccflags-y, aligning with upstream
  PR #76.[2]

* Disable OSLEC echo canceller:
  - OpenWrt provides only oslec.h without echo.c implementation
  - Prevents undefined oslec_* symbol failures during modpost
  - Marks dahdi-echocan-oslec package as unavailable on >= 6.18

* Minor Makefile adjustments for OpenWrt packaging consistency.

These changes collectively restore a complete, warning-free build of
DAHDI 3.4.0 on Linux 6.18 while preserving compatibility with existing
drivers and OpenWrt module packaging.

1. asterisk/dahdi-linux#93
2. asterisk/dahdi-linux#76

Signed-off-by: John Audia <[email protected]>

Author: graysky

libs/dahdi-linux/Makefile

@@ -10,7 +10,7 @@ include $(INCLUDE_DIR)/kernel.mk
 
 PKG_NAME:=dahdi-linux
 PKG_VERSION:=3.4.0
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/asterisk/$(PKG_NAME)/releases/download/v$(PKG_VERSION)
@@ -44,7 +44,7 @@ define KernelPackage/dahdi-echocan-oslec
   TITLE:=DAHDI OSLEC echo canceller support
   DEPENDS:=kmod-dahdi +kmod-echo
   URL:=http://www.asterisk.org/
-  FILES:=$(PKG_BUILD_DIR)/drivers/dahdi/dahdi_echocan_oslec.$(LINUX_KMOD_SUFFIX)
+  FILES:=$(PKG_BUILD_DIR)/drivers/dahdi/dahdi_echocan_oslec.$(LINUX_KMOD_SUFFIX)@lt6.18
   AUTOLOAD:=$(call AutoProbe,dahdi_echocan_oslec)
 endef
 

libs/dahdi-linux/patches/210-kernel-h-Add-wrappers-for.patch

@@ -0,0 +1,44 @@
+--- a/include/dahdi/kernel.h
++++ b/include/dahdi/kernel.h
+@@ -58,6 +58,15 @@
+ 
+ #include <linux/poll.h>
+ 
++/* Added for DAHDI use of hrtimers (hrtimer_init, etc.) */
++#include <linux/hrtimer.h>
++
++/* del_timer[_sync] was renamed to timer_delete[_sync] in newer kernels */
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 15, 0)
++#define del_timer      timer_delete
++#define del_timer_sync timer_delete_sync
++#endif
++
+ #if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 1, 0)
+ #define netif_napi_add netif_napi_add_weight
+ #endif
+@@ -66,6 +75,25 @@
+ #include <linux/pci.h>
+ #include <linux/dma-mapping.h>
+ 
++/* DAHDI expects hrtimer_init(), but kernels >= 6.8 removed it.
++ * Recreate it using the modern hrtimer_setup() API.
++ */
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 8, 0)
++static inline void hrtimer_init(struct hrtimer *timer,
++                                clockid_t clock_id,
++                                enum hrtimer_mode mode)
++{
++    /* No callback yet — DAHDI sets it later with hrtimer_update_function() */
++    hrtimer_setup(timer, NULL, clock_id, mode);
++}
++#endif
++
++/* from_timer() helper was removed in newer kernels; restore it for DAHDI. */
++#ifndef from_timer
++#define from_timer(var, callback_timer, timer_fieldname)           \
++        container_of(callback_timer, typeof(*var), timer_fieldname)
++#endif
++
+ static inline void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle)
+ {
+     return dma_alloc_coherent(hwdev == NULL ? NULL : &hwdev->dev, size, dma_handle, GFP_ATOMIC);

libs/dahdi-linux/patches/211-Kbuild-Use-ccflag-y.patch

@@ -0,0 +1,196 @@
+From ec88adb782aed38c3445c20d20213c51dae7e092 Mon Sep 17 00:00:00 2001
+From: InterLinked1 <[email protected]>
+Date: Fri, 21 Feb 2025 21:42:19 -0500
+Subject: [PATCH] Kbuild: Use ccflags-y instead of EXTRA_CFLAGS.
+
+ccflags-y was added to the kernel back in 2007, in commit
+f77bf01425b11947eeb3b5b54. Recent kernel commit
+dbd83ea09699390892e5efecddd74ae43a00f071 has now completely
+removed the deprecated EXTRA_CFLAGS.
+
+Comments in Kbuild and the Makefile for the oct612x library were
+added back when it was created in 2013 in commit f65299e8b2e6ffb0b07089759f8c4ff33a695c09
+to use the newer ccflags-y based on the kernel version,
+but the change was never made to conditionally move away
+from the EXTRA_CFLAGS.
+
+Now that the older way no longer exists, always use ccflags-y.
+
+Resolves: #76
+---
+ drivers/dahdi/Kbuild            | 4 ++--
+ drivers/dahdi/oct612x/Kbuild    | 5 +----
+ drivers/dahdi/oct612x/Makefile  | 5 +----
+ drivers/dahdi/opvxa1200/Kbuild  | 6 +++---
+ drivers/dahdi/voicebus/Kbuild   | 4 ++--
+ drivers/dahdi/wcb4xxp/Kbuild    | 2 +-
+ drivers/dahdi/wct4xxp/Kbuild    | 6 +++---
+ drivers/dahdi/wctc4xxp/Kbuild   | 4 ++--
+ drivers/dahdi/wctdm24xxp/Kbuild | 2 +-
+ drivers/dahdi/wcte12xp/Kbuild   | 2 +-
+ drivers/dahdi/xpp/Kbuild        | 4 ++--
+ 11 files changed, 19 insertions(+), 25 deletions(-)
+
+--- a/drivers/dahdi/Kbuild
++++ b/drivers/dahdi/Kbuild
+@@ -83,13 +83,13 @@ CFLAGS_MODULE += -I$(DAHDI_INCLUDE) -I$(
+ BAD_KERNELS_VERS := 22 34 34.0.1 34.0.2
+ BAD_KERNELS := $(foreach ver,$(BAD_KERNELS_VERS),2.6.9-$(ver).EL 2.6.9-$(ver).ELsmp)
+ ifneq (,$(filter $(KVERS),$(BAD_KERNELS)))
+-EXTRA_CFLAGS+=-Drw_lock_t=rwlock_t
++ccflags-y+=-Drw_lock_t=rwlock_t
+ endif
+ 
+ # A number of Fedora 10 (9 also?) kernels backported hrtimer to 2.6.27
+ # as part of an ALSA backport. TODO: Any better way to detect that?
+ ifeq (1,$(shell fgrep -q ' hrtimer_set_expires' include/linux/hrtimer.h 2>/dev/null && echo 1))
+-EXTRA_CFLAGS+=-DHAVE_HRTIMER_ACCESSORS=1
++ccflags-y+=-DHAVE_HRTIMER_ACCESSORS=1
+ endif
+ 
+ ifeq (1,$(shell fgrep -q 'wait_for_completion_timeout' include/linux/completion.h 2>/dev/null && echo 1))
+--- a/drivers/dahdi/oct612x/Kbuild
++++ b/drivers/dahdi/oct612x/Kbuild
+@@ -24,9 +24,6 @@ octapi_files = octdeviceapi/oct6100api/o
+ 		apilib/llman/octapi_llman.o \
+ 		oct612x-user.o
+ 
+-# TODO: ccflags was added in 2.6.24 in commit f77bf01425b11947eeb3b5b54. This
+-# should be changed to a conditional compilation based on the Kernel Version.
+-# ccflags-y := -I$(src)/.. -Wno-undef -I$(src)/include -I$(src)/octdeviceapi -I$(src)/octdeviceapi/oct6100api
+-EXTRA_CFLAGS = -I$(src)/.. -Wno-undef -I$(src)/include -I$(src)/octdeviceapi -I$(src)/octdeviceapi/oct6100api
++ccflags-y := -I$(src)/.. -Wno-undef -I$(src)/include -I$(src)/octdeviceapi -I$(src)/octdeviceapi/oct6100api
+ obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_OCT612X) := oct612x.o
+ oct612x-objs := $(octapi_files)
+--- a/drivers/dahdi/oct612x/Makefile
++++ b/drivers/dahdi/oct612x/Makefile
+@@ -23,8 +23,5 @@ octapi_files = octdeviceapi/oct6100api/o
+ 		apilib/largmath/octapi_largmath.o \
+ 		apilib/llman/octapi_llman.o
+ 
+-# TODO: ccflags was added in 2.6.24 in commit f77bf01425b11947eeb3b5b54. This
+-# should be changed to a conditional compilation based on the Kernel Version.
+-# ccflags-y := -I$(src)/.. -Wno-undef -I$(src)/include -I$(src)/octdeviceapi -I$(src)/octdeviceapi/oct6100api
+-EXTRA_CFLAGS = -I$(src)/.. -Wno-undef -I$(src)/include -I$(src)/octdeviceapi -I$(src)/octdeviceapi/oct6100api
++ccflags-y := -I$(src)/.. -Wno-undef -I$(src)/include -I$(src)/octdeviceapi -I$(src)/octdeviceapi/oct6100api
+ lib-y := $(octapi_files)
+--- a/drivers/dahdi/opvxa1200/Kbuild
++++ b/drivers/dahdi/opvxa1200/Kbuild
+@@ -1,6 +1,6 @@
+ obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_OPVXA1200) += opvxa1200.o
+ 
+-EXTRA_CFLAGS += -I$(src)/.. -Wno-undef -Wno-error=unused-variable
++ccflags-y += -I$(src)/.. -Wno-undef
+ 
+ opvxa1200-objs := base.o
+ 
+@@ -10,10 +10,10 @@ ifneq ($(DAHDI_KERNEL_H_PATH),)
+         DAHDI_SPAN_MODULE:=$(shell if grep -C 5 "struct dahdi_span {" $(DAHDI_KERNEL_H_PATH) | grep -q "struct module \*owner"; then echo "yes"; else echo "no"; fi)
+         DAHDI_SPAN_OPS:=$(shell if grep -q "struct dahdi_span_ops {" $(DAHDI_KERNEL_H_PATH); then echo "yes"; else echo "no"; fi)
+         ifeq ($(DAHDI_SPAN_MODULE),yes)
+-                EXTRA_CFLAGS+=-DDAHDI_SPAN_MODULE
++                ccflags-y+=-DDAHDI_SPAN_MODULE
+         else
+                 ifeq ($(DAHDI_SPAN_OPS),yes)
+-                        EXTRA_CFLAGS+=-DDAHDI_SPAN_OPS
++                        ccflags-y+=-DDAHDI_SPAN_OPS
+                 endif
+         endif
+ endif
+--- a/drivers/dahdi/voicebus/Kbuild
++++ b/drivers/dahdi/voicebus/Kbuild
+@@ -8,10 +8,10 @@ ifneq ($(HOTPLUG_FIRMWARE),yes)
+ dahdi_voicebus-objs += $(FIRM_DIR)/dahdi-fw-vpmoct032.o
+ $(warning WARNING: You are compiling firmware into voicebus.ko which is not available under the terms of the GPL. It may be a violation of the GPL to distribute the resulting image since it combines both GPL and non-GPL work. You should consult a lawyer of your own before distributing such an image.)
+ else
+-  EXTRA_CFLAGS+=-DHOTPLUG_FIRMWARE
++  ccflags-y+=-DHOTPLUG_FIRMWARE
+ endif
+ 
+-EXTRA_CFLAGS += -I$(src)/.. -Wno-undef
++ccflags-y += -I$(src)/.. -Wno-undef
+ 
+ $(obj)/$(FIRM_DIR)/dahdi-fw-vpmoct032.o: $(obj)/voicebus.o
+ 	$(MAKE) -C $(obj)/$(FIRM_DIR) dahdi-fw-vpmoct032.o
+--- a/drivers/dahdi/wcb4xxp/Kbuild
++++ b/drivers/dahdi/wcb4xxp/Kbuild
+@@ -1,6 +1,6 @@
+ obj-m += wcb4xxp.o
+ 
+-EXTRA_CFLAGS += -I$(src)/.. -Wno-undef
++ccflags-y += -I$(src)/.. -Wno-undef
+ 
+ wcb4xxp-objs := base.o
+ 
+--- a/drivers/dahdi/wct4xxp/Kbuild
++++ b/drivers/dahdi/wct4xxp/Kbuild
+@@ -2,16 +2,16 @@ obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_WCT
+ 
+ FIRM_DIR	:= ../firmware
+ 
+-EXTRA_CFLAGS += -I$(src)/.. -I$(src)/../oct612x/ $(shell $(src)/../oct612x/octasic-helper cflags $(src)/../oct612x) -Wno-undef
++ccflags-y += -I$(src)/.. -I$(src)/../oct612x/ $(shell $(src)/../oct612x/octasic-helper cflags $(src)/../oct612x) -Wno-undef
+ 
+ # The OCT612X source files are from a vendor drop and we do not want to edit
+ # them to make this warning go away. Therefore, turn off the
+ # unused-but-set-variable warning for this driver.
+ 
+-EXTRA_CFLAGS += $(call cc-option, -Wno-unused-but-set-variable)
++ccflags-y += $(call cc-option, -Wno-unused-but-set-variable)
+ 
+ ifeq ($(HOTPLUG_FIRMWARE),yes)
+-  EXTRA_CFLAGS+=-DHOTPLUG_FIRMWARE
++  ccflags-y+=-DHOTPLUG_FIRMWARE
+ endif
+ 
+ wct4xxp-objs := base.o vpm450m.o
+--- a/drivers/dahdi/wctc4xxp/Kbuild
++++ b/drivers/dahdi/wctc4xxp/Kbuild
+@@ -2,10 +2,10 @@ obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_WCT
+ 
+ FIRM_DIR	:= ../firmware
+ 
+-EXTRA_CFLAGS += -I$(src)/.. -Wno-undef
++ccflags-y += -I$(src)/.. -Wno-undef
+ 
+ ifeq ($(HOTPLUG_FIRMWARE),yes)
+-  EXTRA_CFLAGS+=-DHOTPLUG_FIRMWARE
++  ccflags-y+=-DHOTPLUG_FIRMWARE
+ endif
+ 
+ wctc4xxp-objs := base.o
+--- a/drivers/dahdi/wctdm24xxp/Kbuild
++++ b/drivers/dahdi/wctdm24xxp/Kbuild
+@@ -1,5 +1,5 @@
+ obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_WCTDM24XXP) += wctdm24xxp.o
+ 
+-EXTRA_CFLAGS += -I$(src)/.. -Wno-undef
++ccflags-y += -I$(src)/.. -Wno-undef
+ 
+ wctdm24xxp-objs := base.o xhfc.o
+--- a/drivers/dahdi/wcte12xp/Kbuild
++++ b/drivers/dahdi/wcte12xp/Kbuild
+@@ -1,5 +1,5 @@
+ obj-$(DAHDI_BUILD_ALL)$(CONFIG_DAHDI_WCTE12XP) += wcte12xp.o
+ 
+-EXTRA_CFLAGS += -I$(src)/.. -Wno-undef
++ccflags-y += -I$(src)/.. -Wno-undef
+ 
+ wcte12xp-objs := base.o
+--- a/drivers/dahdi/xpp/Kbuild
++++ b/drivers/dahdi/xpp/Kbuild
+@@ -1,4 +1,4 @@
+-EXTRA_CFLAGS	=	$(XPP_LOCAL_CFLAGS)	\
++ccflags-y	=	$(XPP_LOCAL_CFLAGS)	\
+ 			-DDEBUG			\
+ 			-DPOLL_DIGITAL_INPUTS	\
+ 			-DDEBUG_PCMTX		\
+@@ -32,7 +32,7 @@ xpd_echo-objs		+= card_echo.o
+ xpp_mmap-objs		+= mmapbus.o mmapdrv.o
+ 
+ ifeq	(y,$(PARPORT_DEBUG))
+-EXTRA_CFLAGS	+= -DDEBUG_SYNC_PARPORT
++ccflags-y	+= -DDEBUG_SYNC_PARPORT
+ obj-m		+= parport_debug.o
+ endif
+ 

libs/dahdi-linux/patches/212-disable-OSLEC.patch

@@ -0,0 +1,15 @@
+--- a/drivers/dahdi/Kbuild
++++ b/drivers/dahdi/Kbuild
+@@ -73,9 +73,9 @@ obj-m += $(DAHDI_MODULES_EXTRA)
+ # If you want to build OSLEC, include the code in the standard location:
+ # drivers/staging/echo . The DAHDI OSLEC echo canceller will be built as
+ # well:
+-ifneq (,$(wildcard $(src)/../staging/echo/oslec.h))
+-obj-m += dahdi_echocan_oslec.o
+-endif
++#ifneq (,$(wildcard $(src)/../staging/echo/oslec.h))
++#obj-m += dahdi_echocan_oslec.o
++#endif
+ 
+ CFLAGS_MODULE += -I$(DAHDI_INCLUDE) -I$(src) -Wno-format-truncation
+