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@@ -74,6 +74,10 @@ MODULE_AUTHOR("Paul Diefenbaugh");
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MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
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MODULE_LICENSE("GPL");
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+static int act;
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+module_param(act, int, 0644);
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+MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.\n");
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+
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static int tzp;
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module_param(tzp, int, 0444);
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MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
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@@ -405,11 +409,33 @@ static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
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char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
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- status =
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- acpi_evaluate_integer(tz->device->handle, name, NULL,
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- &tz->trips.active[i].temperature);
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- if (ACPI_FAILURE(status))
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+ if (act == -1)
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+ break; /* disable all active trip points */
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+
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+ status = acpi_evaluate_integer(tz->device->handle,
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+ name, NULL, &tz->trips.active[i].temperature);
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+
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+ if (ACPI_FAILURE(status)) {
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+ if (i == 0) /* no active trip points */
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+ break;
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+ if (act <= 0) /* no override requested */
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+ break;
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+ if (i == 1) { /* 1 trip point */
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+ tz->trips.active[0].temperature =
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+ CELSIUS_TO_KELVIN(act);
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+ } else { /* multiple trips */
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+ /*
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+ * Don't allow override higher than
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+ * the next higher trip point
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+ */
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+ tz->trips.active[i - 1].temperature =
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+ (tz->trips.active[i - 2].temperature <
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+ CELSIUS_TO_KELVIN(act) ?
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+ tz->trips.active[i - 2].temperature :
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+ CELSIUS_TO_KELVIN(act));
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+ }
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break;
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+ }
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name[2] = 'L';
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status =
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