acpi_panasonic: Clear wireless RF_KILL on boot and resume

On Panasonic FZ-Y1 and similar models, the EC latches RF_KILL on
shutdown and suspend when battery is at certain level, causing wireless
to boot with hard block.

Call WLSW.SHRF during attach and resume to clear the block.

Tested on Panasonic FZ-Y1 with Intel Wireless 7265.

Reviewed by:	adrian, obiwac
Approved by:	adrian, obiwac
Differential Revision:	https://reviews.freebsd.org/D55265

1 files changed, 36 insertions, 0 deletions

diff --git a/sys/dev/acpi_support/acpi_panasonic.c b/sys/dev/acpi_support/acpi_panasonic.c
index 67d51ea9bc1f..8fea47ee45e8 100644
--- a/sys/dev/acpi_support/acpi_panasonic.c
+++ b/sys/dev/acpi_support/acpi_panasonic.c
@@ -80,6 +80,8 @@ static int	acpi_panasonic_probe(device_t dev);
 static int	acpi_panasonic_attach(device_t dev);
 static int	acpi_panasonic_detach(device_t dev);
 static int	acpi_panasonic_shutdown(device_t dev);
+static int	acpi_panasonic_resume(device_t dev);
+static void	acpi_panasonic_clear_rfkill(device_t dev);
 static int	acpi_panasonic_sysctl(SYSCTL_HANDLER_ARGS);
 static UINT64	acpi_panasonic_sinf(ACPI_HANDLE h, UINT64 index);
 static void	acpi_panasonic_sset(ACPI_HANDLE h, UINT64 index,
@@ -116,6 +118,7 @@ static device_method_t acpi_panasonic_methods[] = {
 	DEVMETHOD(device_attach,	acpi_panasonic_attach),
 	DEVMETHOD(device_detach,	acpi_panasonic_detach),
 	DEVMETHOD(device_shutdown,	acpi_panasonic_shutdown),
+	DEVMETHOD(device_resume,	acpi_panasonic_resume),
 
 	DEVMETHOD_END
 };
@@ -172,6 +175,8 @@ acpi_panasonic_attach(device_t dev)
 		    CTLFLAG_MPSAFE, sc, i, acpi_panasonic_sysctl, "I", "");
 	}
 
+	acpi_panasonic_clear_rfkill(dev);
+
 #if 0
 	/* Activate hotkeys */
 	status = AcpiEvaluateObject(sc->handle, "", NULL, NULL);
@@ -233,6 +238,37 @@ acpi_panasonic_shutdown(device_t dev)
 }
 
 static int
+acpi_panasonic_resume(device_t dev)
+{
+
+	acpi_panasonic_clear_rfkill(dev);
+	return (0);
+}
+
+static void
+acpi_panasonic_clear_rfkill(device_t dev)
+{
+	ACPI_HANDLE wlsw_handle;
+	ACPI_STATUS status;
+
+	/*
+	 * Call WLSW.SHRF to clear wireless RF_KILL on models that have it.
+	 * On FZ-Y1 and similar models, the EC latches RF_KILL on shutdown
+	 * and suspend, causing the wireless card to boot with hard block
+	 * enabled.  The SHRF method sets the EC state to deassert RF_KILL
+	 * GPIO on mini-PCIe pin 20 via SMI (ASRV call with function
+	 * 0x0F/0x03).
+	 */
+	status = AcpiGetHandle(NULL, "\\_SB.WLSW", &wlsw_handle);
+	if (ACPI_SUCCESS(status)) {
+		status = AcpiEvaluateObject(wlsw_handle, "SHRF", NULL, NULL);
+		if (ACPI_FAILURE(status) && bootverbose)
+			device_printf(dev, "WLSW.SHRF failed: %s\n",
+			    AcpiFormatException(status));
+	}
+}
+
+static int
 acpi_panasonic_sysctl(SYSCTL_HANDLER_ARGS)
 {
 	struct acpi_panasonic_softc *sc;