git: 1198b0ca9d6d - stable/14 - asmc: add Wake-on-LAN control via sysctl

The branch stable/14 has been updated by ngie:

URL: https://cgit.FreeBSD.org/src/commit/?id=1198b0ca9d6d7b579304404bc38ed17d394fc5a4

commit 1198b0ca9d6d7b579304404bc38ed17d394fc5a4
Author:     Abdelkader Boudih <freebsd@seuros.com>
AuthorDate: 2026-02-25 06:32:42 +0000
Commit:     Enji Cooper <ngie@FreeBSD.org>
CommitDate: 2026-04-25 16:25:42 +0000

    asmc: add Wake-on-LAN control via sysctl
    
    Apple Mac systems support Wake-on-LAN from powered-off state (S5/G2) via
    the AUPO SMC key.
    
    This change adds a convenience sysctl, `dev.asmc.0.wol`. This can be
    disabled if set to 0 and enabled if set to 1.
    
    The AUPO key is volatile and resets to 0x00 on every boot, so WoL must
    be manually enabled before each shutdown to work from powered-off state.
    Users need to run: `sysctl dev.asmc.0.wol=1` before shutting down the
    system. The sysctl is best set to persist in `/etc/sysctl.conf`.
    
    MFC after:      1 week
    Reviewed By:    markj, ngie
    Differential Revision:  https://reviews.freebsd.org/D54439
    
    (cherry picked from commit 94db365042d35ff7e3ee7365a87a89bab1560030)
---
 sys/dev/asmc/asmc.c    | 45 +++++++++++++++++++++++++++++++++++++++++++++
 sys/dev/asmc/asmcvar.h |  5 +++++
 2 files changed, 50 insertions(+)

diff --git a/sys/dev/asmc/asmc.c b/sys/dev/asmc/asmc.c
index 56518269be07..40aa74202a67 100644
--- a/sys/dev/asmc/asmc.c
+++ b/sys/dev/asmc/asmc.c
@@ -108,6 +108,7 @@ static int 	asmc_mbp_sysctl_light_left(SYSCTL_HANDLER_ARGS);
 static int 	asmc_mbp_sysctl_light_right(SYSCTL_HANDLER_ARGS);
 static int 	asmc_mbp_sysctl_light_control(SYSCTL_HANDLER_ARGS);
 static int 	asmc_mbp_sysctl_light_left_10byte(SYSCTL_HANDLER_ARGS);
+static int	asmc_wol_sysctl(SYSCTL_HANDLER_ARGS);
 
 struct asmc_model {
 	const char *smc_model; /* smbios.system.product env var. */
@@ -915,9 +916,12 @@ static int
 asmc_init(device_t dev)
 {
 	struct asmc_softc *sc = device_get_softc(dev);
+	struct sysctl_ctx_list *sysctlctx;
 	int i, error = 1;
 	uint8_t buf[4];
 
+	sysctlctx = device_get_sysctl_ctx(dev);
+
 	if (sc->sc_model->smc_sms_x == NULL)
 		goto nosms;
 
@@ -987,6 +991,16 @@ asmc_init(device_t dev)
 out:
 	asmc_sms_calibrate(dev);
 nosms:
+	/* Wake-on-LAN convenience sysctl */
+	if (asmc_key_read(dev, ASMC_KEY_AUPO, buf, 1) == 0) {
+		SYSCTL_ADD_PROC(sysctlctx,
+		    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
+		    OID_AUTO, "wol",
+		    CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
+		    dev, 0, asmc_wol_sysctl, "I",
+		    "Wake-on-LAN enable (0=off, 1=on)");
+	}
+
 	sc->sc_nfan = asmc_fan_count(dev);
 	if (sc->sc_nfan > ASMC_MAXFANS) {
 		device_printf(dev, "more than %d fans were detected. Please "
@@ -1741,3 +1755,34 @@ asmc_mbp_sysctl_light_left_10byte(SYSCTL_HANDLER_ARGS)
 
 	return (error);
 }
+
+/*
+ * Wake-on-LAN convenience sysctl.
+ * Reading returns 1 if WoL is enabled, 0 if disabled.
+ * Writing 1 enables WoL, 0 disables it.
+ */
+static int
+asmc_wol_sysctl(SYSCTL_HANDLER_ARGS)
+{
+	device_t dev = (device_t)arg1;
+	uint8_t aupo;
+	int val, error;
+
+	/* Read current AUPO value */
+	if (asmc_key_read(dev, ASMC_KEY_AUPO, &aupo, 1) != 0)
+		return (EIO);
+
+	val = (aupo != 0) ? 1 : 0;
+	error = sysctl_handle_int(oidp, &val, 0, req);
+	if (error != 0 || req->newptr == NULL)
+		return (error);
+
+	/* Clamp to 0 or 1 */
+	aupo = (val != 0) ? 1 : 0;
+
+	/* Write AUPO */
+	if (asmc_key_write(dev, ASMC_KEY_AUPO, &aupo, 1) != 0)
+		return (EIO);
+
+	return (0);
+}
diff --git a/sys/dev/asmc/asmcvar.h b/sys/dev/asmc/asmcvar.h
index 102bee8a15b7..602f363594b9 100644
--- a/sys/dev/asmc/asmcvar.h
+++ b/sys/dev/asmc/asmcvar.h
@@ -125,6 +125,11 @@ struct asmc_softc {
  */
 #define ASMC_KEY_CLAMSHELL	"MSLD"	/* RO; 1 byte */
 
+/*
+ * Auto power on / Wake-on-LAN.
+ */
+#define ASMC_KEY_AUPO		"AUPO"	/* RW; 1 byte */
+
 /*
  * Interrupt keys.
  */