git: 78e9708c98aa - stable/14 - asmc: output the SMC firmware revision on attach

The branch stable/14 has been updated by ngie:

URL: https://cgit.FreeBSD.org/src/commit/?id=78e9708c98aa7b1362cdb909f3530592c97ee904

commit 78e9708c98aa7b1362cdb909f3530592c97ee904
Author:     Enji Cooper <ngie@FreeBSD.org>
AuthorDate: 2026-03-01 18:54:56 +0000
Commit:     Enji Cooper <ngie@FreeBSD.org>
CommitDate: 2026-04-25 16:25:43 +0000

    asmc: output the SMC firmware revision on attach
    
    The SMC firmware revision can prove helpful when determining why the
    behavior of a given controller varies from the maintainers' expected
    behavior.
    
    This should be a sysctl (eventually), but for now dumping out the
    information via `device_printf(..)` suffices, given that only one
    asmc(4) compatible device can exist in an Apple platform at any
    given point in time. This will become a sysctl in the future after
    additional improvements are incorporated from OpenBSD and NetBSD.
    
    MFC after:      1 week
    Obtained from:  https://github.com/openbsd/src/ (sys/dev/acpi/asmc.c @ 142d064)
    Differential Revision: https://reviews.freebsd.org/D55577
    
    (cherry picked from commit e81e724358e43dcf951e244a9df9df3eaa983fe9)
---
 sys/dev/asmc/asmc.c    | 11 +++++++++--
 sys/dev/asmc/asmcvar.h |  3 +++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/sys/dev/asmc/asmc.c b/sys/dev/asmc/asmc.c
index 079689e2ec2b..066b9c80de23 100644
--- a/sys/dev/asmc/asmc.c
+++ b/sys/dev/asmc/asmc.c
@@ -51,6 +51,7 @@
 #include <sys/rman.h>
 
 #include <machine/resource.h>
+#include <netinet/in.h>
 
 #include <contrib/dev/acpica/include/acpi.h>
 
@@ -937,11 +938,17 @@ asmc_init(device_t dev)
 {
 	struct asmc_softc *sc = device_get_softc(dev);
 	struct sysctl_ctx_list *sysctlctx;
+	uint8_t buf[6];
 	int i, error = 1;
-	uint8_t buf[4];
 
 	sysctlctx = device_get_sysctl_ctx(dev);
 
+	error = asmc_key_read(dev, ASMC_KEY_REV, buf, 6);
+	if (error != 0)
+		goto out_err;
+	device_printf(dev, "SMC revision: %x.%x%x%x\n", buf[0], buf[1], buf[2],
+	    ntohs(*(uint16_t *)buf + 4));
+
 	if (sc->sc_model->smc_sms_x == NULL)
 		goto nosms;
 
@@ -1040,10 +1047,10 @@ nosms:
 		sc->sc_nkeys = 0;
 	}
 
+out_err:
 #ifdef ASMC_DEBUG
 	asmc_dumpall(dev);
 #endif
-
 	return (error);
 }
 
diff --git a/sys/dev/asmc/asmcvar.h b/sys/dev/asmc/asmcvar.h
index 602f363594b9..d216fd1416e4 100644
--- a/sys/dev/asmc/asmcvar.h
+++ b/sys/dev/asmc/asmcvar.h
@@ -78,6 +78,9 @@ struct asmc_softc {
 /* Number of keys */
 #define ASMC_NKEYS		"#KEY"	/* RO; 4 bytes */
 
+/* Query the ASMC revision */
+#define ASMC_KEY_REV		"REV "  /* RO: 6 bytes */
+
 /*
  * Fan control via SMC.
  */