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Date: Thu, 22 Mar 2012 14:08:19 +0100
From: Corentin Chary <corentincj@...aif.net>
To: Matthew Garrett <mjg59@...f.ucam.org>
Cc: Corentin Chary <corentincj@...aif.net>,
Matthew Garrett <mjg@...hat.com>,
platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] samsung-laptop: unregister ACPI video module for some well known laptops
On these laptops, the ACPI video is not functional, and very unlikely
to be fixed by the vendor. Note that intel_backlight works for some
of these laptops, and the backlight from samsung-laptop always work.
The good news is that newer laptops have functional ACPI video device
and won't end up growing this list.
Signed-off-by: Corentin Chary <corentincj@...aif.net>
---
drivers/platform/x86/samsung-laptop.c | 80 +++++++++++++++++++++++++++++++--
1 files changed, 76 insertions(+), 4 deletions(-)
diff --git a/drivers/platform/x86/samsung-laptop.c b/drivers/platform/x86/samsung-laptop.c
index 4787afd..e2a34b4 100644
--- a/drivers/platform/x86/samsung-laptop.c
+++ b/drivers/platform/x86/samsung-laptop.c
@@ -26,6 +26,9 @@
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/ctype.h>
+#if (defined CONFIG_ACPI_VIDEO || defined CONFIG_ACPI_VIDEO_MODULE)
+#include <acpi/video.h>
+#endif
/*
* This driver is needed because a number of Samsung laptops do not hook
@@ -336,6 +339,7 @@ struct samsung_laptop {
struct work_struct kbd_led_work;
struct samsung_laptop_debug debug;
+ struct samsung_quirks *quirks;
bool handle_backlight;
bool has_stepping_quirk;
@@ -343,7 +347,15 @@ struct samsung_laptop {
char sdiag[64];
};
+struct samsung_quirks {
+ bool broken_acpi_video;
+};
+
+static struct samsung_quirks samsung_unknown = {};
+static struct samsung_quirks samsung_broken_acpi_video = {
+ .broken_acpi_video = true,
+};
static bool force;
module_param(force, bool, 0);
@@ -1416,6 +1428,14 @@ static int __init samsung_platform_init(struct samsung_laptop *samsung)
return 0;
}
+static struct samsung_quirks *quirks;
+
+static int __init samsung_dmi_matched(const struct dmi_system_id *d)
+{
+ quirks = d->driver_data;
+ return 0;
+}
+
static struct dmi_system_id __initdata samsung_dmi_table[] = {
{
.matches = {
@@ -1445,6 +1465,47 @@ static struct dmi_system_id __initdata samsung_dmi_table[] = {
DMI_MATCH(DMI_CHASSIS_TYPE, "14"), /* Sub-Notebook */
},
},
+ /* Specific DMI ids for laptop with quirks */
+ {
+ .callback = samsung_dmi_matched,
+ .ident = "N150P",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
+ DMI_MATCH(DMI_BOARD_NAME, "N150P"),
+ },
+ .driver_data = &samsung_broken_acpi_video,
+ },
+ {
+ .callback = samsung_dmi_matched,
+ .ident = "N145P/N250P/N260P",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
+ DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
+ },
+ .driver_data = &samsung_broken_acpi_video,
+ },
+ {
+ .callback = samsung_dmi_matched,
+ .ident = "N150/N210/N220",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
+ DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
+ },
+ .driver_data = &samsung_broken_acpi_video,
+ },
+ {
+ .callback = samsung_dmi_matched,
+ .ident = "NF110/NF210/NF310",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
+ DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
+ },
+ .driver_data = &samsung_broken_acpi_video,
+ },
{ },
};
MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
@@ -1456,6 +1517,7 @@ static int __init samsung_init(void)
struct samsung_laptop *samsung;
int ret;
+ quirks = &samsung_unknown;
if (!force && !dmi_check_system(samsung_dmi_table))
return -ENODEV;
@@ -1465,12 +1527,21 @@ static int __init samsung_init(void)
mutex_init(&samsung->sabi_mutex);
samsung->handle_backlight = true;
+ samsung->quirks = quirks;
-#ifdef CONFIG_ACPI
+
+#if (defined CONFIG_ACPI_VIDEO || defined CONFIG_ACPI_VIDEO_MODULE)
/* Don't handle backlight here if the acpi video already handle it */
- if (acpi_video_backlight_support())
- samsung->handle_backlight = false;
+ if (acpi_video_backlight_support()) {
+ if (samsung->quirks->broken_acpi_video) {
+ pr_info("Disabling ACPI video driver\n");
+ acpi_video_unregister();
+ } else {
+ samsung->handle_backlight = false;
+ }
+ }
#endif
+
ret = samsung_platform_init(samsung);
if (ret)
goto error_platform;
@@ -1481,7 +1552,8 @@ static int __init samsung_init(void)
#ifdef CONFIG_ACPI
/* Only log that if we are really on a sabi platform */
- if (acpi_video_backlight_support())
+ if (acpi_video_backlight_support() &&
+ !samsung->quirks->broken_acpi_video)
pr_info("Backlight controlled by ACPI video driver\n");
#endif
--
1.7.3.4
--
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