linux-kernel - [PATCH v4 2/4] platform/x86: fujitsu-laptop: sync backlight power status in acpi_fujitsu_laptop

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Message-Id: <20170310105036.26899-3-kernel@kempniu.pl>
Date:   Fri, 10 Mar 2017 11:50:34 +0100
From:   Michał Kępień <kernel@...pniu.pl>
To:     Jonathan Woithe <jwoithe@...t42.net>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 2/4] platform/x86: fujitsu-laptop: sync backlight power status in acpi_fujitsu_laptop_add()

Registering an ACPI driver does not mean the device it handles has to
exist.  As the code which syncs backlight power status uses
call_fext_func(), it needs the FUJ02E3 ACPI device to be present, so
ensure that code is only run once the FUJ02E3 device is detected.

Signed-off-by: Michał Kępień <kernel@...pniu.pl>
---
 drivers/platform/x86/fujitsu-laptop.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
index 5ec596c5053d..165971b102e7 100644
--- a/drivers/platform/x86/fujitsu-laptop.c
+++ b/drivers/platform/x86/fujitsu-laptop.c
@@ -955,6 +955,14 @@ static int acpi_fujitsu_laptop_add(struct acpi_device *device)
 	/* Suspect this is a keymap of the application panel, print it */
 	pr_info("BTNI: [0x%x]\n", call_fext_func(FUNC_BUTTONS, 0x0, 0x0, 0x0));
 
+	/* Sync backlight power status */
+	if (acpi_video_get_backlight_type() == acpi_backlight_vendor) {
+		if (call_fext_func(FUNC_BACKLIGHT, 0x2, 0x4, 0x0) == 3)
+			fujitsu_bl->bl_device->props.power = FB_BLANK_POWERDOWN;
+		else
+			fujitsu_bl->bl_device->props.power = FB_BLANK_UNBLANK;
+	}
+
 #if IS_ENABLED(CONFIG_LEDS_CLASS)
 	if (call_fext_func(FUNC_LEDS, 0x0, 0x0, 0x0) & LOGOLAMP_POWERON) {
 		result = led_classdev_register(&fujitsu_bl->pf_device->dev,
@@ -1272,14 +1280,6 @@ static int __init fujitsu_init(void)
 	if (ret)
 		goto fail_laptop1;
 
-	/* Sync backlight power status (needs FUJ02E3 device, hence deferred) */
-	if (acpi_video_get_backlight_type() == acpi_backlight_vendor) {
-		if (call_fext_func(FUNC_BACKLIGHT, 0x2, 0x4, 0x0) == 3)
-			fujitsu_bl->bl_device->props.power = FB_BLANK_POWERDOWN;
-		else
-			fujitsu_bl->bl_device->props.power = FB_BLANK_UNBLANK;
-	}
-
 	pr_info("driver " FUJITSU_DRIVER_VERSION " successfully loaded\n");
 
 	return 0;
-- 
2.12.0