From 470ba6d1781601da53296496d8fbf882a678b3db Mon Sep 17 00:00:00 2001
From: Kunyang_Fan <kunyang_fan@asus.com>
Date: Tue, 24 Aug 2021 15:26:59 +0800
Subject: [PATCH] UBUNTU: ODM: mfd: Check AAEON BFPI version before adding
 device

BugLink: https://bugs.launchpad.net/bugs/1937897

For the below: error log occurring in some devices:
gpio gpiochip0: (gpio_aaeon): tried to insert a GPIO chip with zero lines
gpiochip_add_data_with_key: GPIOs 0..-1 (gpio_aaeon) failed to register

Add the BFPI version checking mechanism to prevent error log bumping.

Fixes: 424945128781 ("UBUNTU: ODM: mfd: Add support for IO functions of AAEON devices")
Signed-off-by: Kunyang_Fan <kunyang_fan@asus.com>
Acked-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Chia-Lin Kao (AceLan) <acelan.kao@canonical.com>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>
---
 drivers/mfd/mfd-aaeon.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/mfd/mfd-aaeon.c b/drivers/mfd/mfd-aaeon.c
index 9d2efde53cad..74211d01ce65 100644
--- a/drivers/mfd/mfd-aaeon.c
+++ b/drivers/mfd/mfd-aaeon.c
@@ -16,12 +16,17 @@
 #include <linux/kernel.h>
 #include <linux/mfd/core.h>
 #include <linux/module.h>
+#include <linux/platform_data/x86/asus-wmi.h>
 #include <linux/platform_device.h>
 #include <linux/leds.h>
 #include <linux/wmi.h>
 
 #define AAEON_WMI_MGMT_GUID      "97845ED0-4E6D-11DE-8A39-0800200C9A66"
 
+#define WMI_REPORT_CAPABILITY_METHOD	0x00000000
+#define MAX_BFPI_VERSION		255
+#define GET_REVISION_ID			0x00
+
 struct aaeon_wmi_priv {
 	const struct mfd_cell *cells;
 	size_t ncells;
@@ -39,6 +44,21 @@ static const struct aaeon_wmi_priv aaeon_wmi_priv_data = {
 	.ncells = ARRAY_SIZE(aaeon_mfd_cells),
 };
 
+static int aaeon_wmi_check_device(void)
+{
+	int err;
+	int retval;
+
+	err = asus_wmi_evaluate_method(WMI_REPORT_CAPABILITY_METHOD, GET_REVISION_ID, 0,
+				       &retval);
+	if (err)
+		return -ENODEV;
+	if (retval < 3 || retval > MAX_BFPI_VERSION)
+		return -ENODEV;
+
+	return 0;
+}
+
 static int aaeon_wmi_probe(struct wmi_device *wdev, const void *context)
 {
 	struct aaeon_wmi_priv *priv;
@@ -48,6 +68,8 @@ static int aaeon_wmi_probe(struct wmi_device *wdev, const void *context)
 		return -ENODEV;
 	}
 
+	if (aaeon_wmi_check_device())
+		return -ENODEV;
 
 	priv = (struct aaeon_wmi_priv *)context;
 	dev_set_drvdata(&wdev->dev, priv);