linux-kernel - [PATCH] ACPI / property: Support strings in Apple

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Message-Id: <20230424-acpi-prop-v1-1-ffa9a300b1cd@marcan.st>
Date:   Mon, 24 Apr 2023 15:46:57 +0900
From:   Hector Martin <marcan@...can.st>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        asahi@...ts.kernel.dev, Lukas Wunner <lukas@...ner.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Hector Martin <marcan@...can.st>
Subject: [PATCH] ACPI / property: Support strings in Apple _DSM props

The Wi-Fi module in x86 Apple machines has a "module-instance" device
property that specifies the platform type and is used for firmware
selection. Its value is a string, so add support for string values in
acpi_extract_apple_properties().

Reviewed-by: Lukas Wunner <lukas@...ner.de>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Hector Martin <marcan@...can.st>
---
 drivers/acpi/x86/apple.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/x86/apple.c b/drivers/acpi/x86/apple.c
index 8812ecd03d55..45d0f16f374f 100644
--- a/drivers/acpi/x86/apple.c
+++ b/drivers/acpi/x86/apple.c
@@ -71,13 +71,16 @@ void acpi_extract_apple_properties(struct acpi_device *adev)
 
 		if ( key->type != ACPI_TYPE_STRING ||
 		    (val->type != ACPI_TYPE_INTEGER &&
-		     val->type != ACPI_TYPE_BUFFER))
+		     val->type != ACPI_TYPE_BUFFER &&
+		     val->type != ACPI_TYPE_STRING))
 			continue; /* skip invalid properties */
 
 		__set_bit(i, valid);
 		newsize += key->string.length + 1;
 		if ( val->type == ACPI_TYPE_BUFFER)
 			newsize += val->buffer.length;
+		else if (val->type == ACPI_TYPE_STRING)
+			newsize += val->string.length + 1;
 	}
 
 	numvalid = bitmap_weight(valid, numprops);
@@ -119,6 +122,12 @@ void acpi_extract_apple_properties(struct acpi_device *adev)
 		newprops[v].type = val->type;
 		if (val->type == ACPI_TYPE_INTEGER) {
 			newprops[v].integer.value = val->integer.value;
+		} else if (val->type == ACPI_TYPE_STRING) {
+			newprops[v].string.length = val->string.length;
+			newprops[v].string.pointer = free_space;
+			memcpy(free_space, val->string.pointer,
+			       val->string.length);
+			free_space += val->string.length + 1;
 		} else {
 			newprops[v].buffer.length = val->buffer.length;
 			newprops[v].buffer.pointer = free_space;

---
base-commit: fe15c26ee26efa11741a7b632e9f23b01aca4cc6
change-id: 20230424-acpi-prop-7b6715ff40d6

Best regards,
-- 
Hector Martin <marcan@...can.st>