linux-kernel - [PATCH 2/2] Input: i8042: Add LoongArch support in i8042-acpipnpio.h

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Message-Id: <20220917064020.1639709-2-chenhuacai@loongson.cn>
Date:   Sat, 17 Sep 2022 14:40:20 +0800
From:   Huacai Chen <chenhuacai@...ngson.cn>
To:     Arnd Bergmann <arnd@...db.de>, Huacai Chen <chenhuacai@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     loongarch@...ts.linux.dev, linux-arch@...r.kernel.org,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Guo Ren <guoren@...nel.org>, Xuerui Wang <kernel@...0n.name>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Huacai Chen <chenhuacai@...ngson.cn>
Subject: [PATCH 2/2] Input: i8042: Add LoongArch support in i8042-acpipnpio.h

LoongArch uses ACPI and nearly the same as X86/IA64 for 8042. So modify
i8042-acpipnpio.h slightly and enable it for LoongArch in i8042.h. Then
i8042 driver can work well under the ACPI firmware with PNP typed key-
board and mouse configured in DSDT.

Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
 drivers/input/serio/i8042-acpipnpio.h | 8 ++++++--
 drivers/input/serio/i8042.h           | 2 +-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/input/serio/i8042-acpipnpio.h b/drivers/input/serio/i8042-acpipnpio.h
index d14b9fb59d6c..c22151f180bb 100644
--- a/drivers/input/serio/i8042-acpipnpio.h
+++ b/drivers/input/serio/i8042-acpipnpio.h
@@ -2,6 +2,7 @@
 #ifndef _I8042_ACPIPNPIO_H
 #define _I8042_ACPIPNPIO_H
 
+#include <linux/acpi.h>
 
 #ifdef CONFIG_X86
 #include <asm/x86_init.h>
@@ -1449,16 +1450,19 @@ static int __init i8042_pnp_init(void)
 
 	if (!i8042_pnp_kbd_devices && !i8042_pnp_aux_devices) {
 		i8042_pnp_exit();
+		pr_info("PNP: No PS/2 controller found.\n");
 #if defined(__ia64__)
 		return -ENODEV;
+#elif defined(__loongarch__)
+		if (acpi_disabled == 0)
+			return -ENODEV;
 #else
-		pr_info("PNP: No PS/2 controller found.\n");
 		if (x86_platform.legacy.i8042 !=
 				X86_LEGACY_I8042_EXPECTED_PRESENT)
 			return -ENODEV;
+#endif
 		pr_info("Probing ports directly.\n");
 		return 0;
-#endif
 	}
 
 	if (i8042_pnp_kbd_devices)
diff --git a/drivers/input/serio/i8042.h b/drivers/input/serio/i8042.h
index bf2592fa9a78..adb5173372d3 100644
--- a/drivers/input/serio/i8042.h
+++ b/drivers/input/serio/i8042.h
@@ -19,7 +19,7 @@
 #include "i8042-snirm.h"
 #elif defined(CONFIG_SPARC)
 #include "i8042-sparcio.h"
-#elif defined(CONFIG_X86) || defined(CONFIG_IA64)
+#elif defined(CONFIG_X86) || defined(CONFIG_IA64) || defined(CONFIG_LOONGARCH)
 #include "i8042-acpipnpio.h"
 #else
 #include "i8042-io.h"
-- 
2.31.1