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Commit 0b5bfa1c authored by Len Brown's avatar Len Brown
Browse files

ACPI: thermal: add DMI hooks to handle AOpen's broken Award BIOS 

Use DMI to:
1. enable polling (BIOS thermal events are broken)
2. disable active trip points (BIOS fan control is broken)
3. disable passive trip point (BIOS hard-codes it too low)

The actual temperature reading does work,
and with the aid of polling, the critical
trip point should work too.

http://bugzilla.kernel.org/show_bug.cgi?id=8842



Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent f8707ec9

drivers/acpi/thermal.c

+65 −0
Original line number Diff line number Diff line
@@ -33,6 +33,7 @@ 


#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/dmi.h>

#include <linux/init.h>

#include <linux/types.h>

#include <linux/proc_fs.h>
@@ -1328,10 +1329,74 @@ static int acpi_thermal_resume(struct acpi_device *device) 
	return AE_OK;

}



#ifdef CONFIG_DMI

static int thermal_act(struct dmi_system_id *d) {



	if (act == 0) {

		printk(KERN_NOTICE "ACPI: %s detected: "

			"disabling all active thermal trip points\n", d->ident);

		act = -1;

	}

	return 0;

}

static int thermal_tzp(struct dmi_system_id *d) {



	if (tzp == 0) {

		printk(KERN_NOTICE "ACPI: %s detected: "

			"enabling thermal zone polling\n", d->ident);

		tzp = 300;	/* 300 dS = 30 Seconds */

	}

	return 0;

}

static int thermal_psv(struct dmi_system_id *d) {



	if (psv == 0) {

		printk(KERN_NOTICE "ACPI: %s detected: "

			"disabling all passive thermal trip points\n", d->ident);

		psv = -1;

	}

	return 0;

}



static struct dmi_system_id thermal_dmi_table[] __initdata = {

	/*

	 * Award BIOS on this AOpen makes thermal control almost worthless.

	 * http://bugzilla.kernel.org/show_bug.cgi?id=8842

	 */

	{

	 .callback = thermal_act,

	 .ident = "AOpen i915GMm-HFS",

	 .matches = {

		DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),

		DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),

		},

	},

	{

	 .callback = thermal_psv,

	 .ident = "AOpen i915GMm-HFS",

	 .matches = {

		DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),

		DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),

		},

	},

	{

	 .callback = thermal_tzp,

	 .ident = "AOpen i915GMm-HFS",

	 .matches = {

		DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),

		DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),

		},

	},

	{}

};

#endif /* CONFIG_DMI */



static int __init acpi_thermal_init(void)

{

	int result = 0;



	dmi_check_system(thermal_dmi_table);



	if (off) {

		printk(KERN_NOTICE "ACPI: thermal control disabled\n");

		return -ENODEV;