Re: [PATCH v2 16/35] brcmfmac: acpi: Add support for fetching Apple ACPI properties

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On 1/4/2022 8:26 AM, Hector Martin wrote:
On DT platforms, the module-instance and antenna-sku-info properties
are passed in the DT. On ACPI platforms, module-instance is passed via
the analogous Apple device property mechanism, while the antenna SKU
info is instead obtained via an ACPI method that grabs it from
non-volatile storage.

Add support for this, to allow proper firmware selection on Apple
platforms.

Signed-off-by: Hector Martin <marcan@xxxxxxxxx>
---
  .../broadcom/brcm80211/brcmfmac/Makefile      |  2 +
  .../broadcom/brcm80211/brcmfmac/acpi.c        | 47 +++++++++++++++++++
  .../broadcom/brcm80211/brcmfmac/common.c      |  1 +
  .../broadcom/brcm80211/brcmfmac/common.h      |  9 ++++
  4 files changed, 59 insertions(+)
  create mode 100644 drivers/net/wireless/broadcom/brcm80211/brcmfmac/acpi.c

[...]

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/acpi.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/acpi.c
new file mode 100644
index 000000000000..2b1a4448b291
--- /dev/null
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/acpi.c
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: ISC
+/*
+ * Copyright The Asahi Linux Contributors
+ */
+
+#include <linux/acpi.h>
+#include "debug.h"
+#include "core.h"
+#include "common.h"
+
+void brcmf_acpi_probe(struct device *dev, enum brcmf_bus_type bus_type,
+		      struct brcmf_mp_device *settings)
+{
+	acpi_status status;
+	const union acpi_object *o;
+	struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+
+	if (!adev)
+		return;
+
+	if (!ACPI_FAILURE(acpi_dev_get_property(adev, "module-instance",
+						ACPI_TYPE_STRING, &o))) {
+		brcmf_dbg(INFO, "ACPI module-instance=%s\n", o->string.pointer);
+		settings->board_type = devm_kasprintf(dev, GFP_KERNEL,
+						      "apple,%s",
+						      o->string.pointer);
+	} else {
+		brcmf_dbg(INFO, "No ACPI module-instance\n");

Do you need to obtain the antenna-sku when there is no module-instance?

+	}
+
+	status = acpi_evaluate_object(adev->handle, "RWCV", NULL, &buf);

Can you clarify what the above does? What does the "RWCV" mean?

+	o = buf.pointer;
+	if (!ACPI_FAILURE(status) && o && o->type == ACPI_TYPE_BUFFER &&
+	    o->buffer.length >= 2) {
+		char *antenna_sku = devm_kzalloc(dev, 3, GFP_KERNEL);
+
+		memcpy(antenna_sku, o->buffer.pointer, 2);
+		brcmf_dbg(INFO, "ACPI RWCV data=%*phN antenna-sku=%s\n",
+			  (int)o->buffer.length, o->buffer.pointer,
+			  antenna_sku);
+
+		settings->antenna_sku = antenna_sku;
+	} else {
+		brcmf_dbg(INFO, "No ACPI antenna-sku\n");
+	}
+}

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