2 files changed, 149 insertions, 14 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 09c0ec100f61..975f029be25c 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1822,6 +1822,26 @@ and is between 256 and 4096 characters. It is defined in the file
         thash_entries=  [KNL,NET]
                         Set number of hash buckets for TCP connection
 
+        thermal.act=    [HW,ACPI]
+                        -1: disable all active trip points in all thermal zones
+                        <degrees C>: override all lowest active trip points
+
+        thermal.nocrt=  [HW,ACPI]
+                        Set to disable actions on ACPI thermal zone
+                        critical and hot trip points.
+
+        thermal.off=    [HW,ACPI]
+                        1: disable ACPI thermal control
+
+        thermal.psv=    [HW,ACPI]
+                        -1: disable all passive trip points
+                        <degrees C>: override all passive trip points to this value
+
+        thermal.tzp=    [HW,ACPI]
+                        Specify global default ACPI thermal zone polling rate
+                        <deci-seconds>: poll all this frequency
+                        0: no polling (default)
+
         time            Show timing data prefixed to each printk message line
                         [deprecated, see 'printk.time']
 
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 5a62de1b7f2a..1e06159fd9c4 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -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>
@@ -74,10 +75,26 @@ MODULE_AUTHOR("Paul Diefenbaugh");
 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
 MODULE_LICENSE("GPL");
 
+static int act;
+module_param(act, int, 0644);
+MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.\n");
+
 static int tzp;
-module_param(tzp, int, 0);
+module_param(tzp, int, 0444);
 MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");
 
+static int nocrt;
+module_param(nocrt, int, 0);
+MODULE_PARM_DESC(nocrt, "Set to disable action on ACPI thermal zone critical and hot trips.\n");
+
+static int off;
+module_param(off, int, 0);
+MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.\n");
+
+static int psv;
+module_param(psv, int, 0644);
+MODULE_PARM_DESC(psv, "Disable or override all passive trip points.\n");
+
 static int acpi_thermal_add(struct acpi_device *device);
 static int acpi_thermal_remove(struct acpi_device *device, int type);
 static int acpi_thermal_resume(struct acpi_device *device);
@@ -339,9 +356,16 @@ static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 
         /* Passive: Processors (optional) */
 
-        status =
-            acpi_evaluate_integer(tz->device->handle, "_PSV", NULL,
-                                  &tz->trips.passive.temperature);
+        if (psv == -1) {
+                status = AE_SUPPORT;
+        } else if (psv > 0) {
+                tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
+                status = AE_OK;
+        } else {
+                status = acpi_evaluate_integer(tz->device->handle,
+                        "_PSV", NULL, &tz->trips.passive.temperature);
+        }
+
         if (ACPI_FAILURE(status)) {
                 tz->trips.passive.flags.valid = 0;
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
@@ -386,11 +410,33 @@ static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 
                 char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
 
-                status =
-                    acpi_evaluate_integer(tz->device->handle, name, NULL,
-                                          &tz->trips.active[i].temperature);
-                if (ACPI_FAILURE(status))
+                if (act == -1)
+                        break;  /* disable all active trip points */
+
+                status = acpi_evaluate_integer(tz->device->handle,
+                        name, NULL, &tz->trips.active[i].temperature);
+
+                if (ACPI_FAILURE(status)) {
+                        if (i == 0)     /* no active trip points */
+                                break;
+                        if (act <= 0)   /* no override requested */
+                                break;
+                        if (i == 1) {   /* 1 trip point */
+                                tz->trips.active[0].temperature =
+                                        CELSIUS_TO_KELVIN(act);
+                        } else {        /* multiple trips */
+                                /*
+                                 * Don't allow override higher than
+                                 * the next higher trip point
+                                 */
+                                tz->trips.active[i - 1].temperature =
+                                    (tz->trips.active[i - 2].temperature <
+                                        CELSIUS_TO_KELVIN(act) ?
+                                        tz->trips.active[i - 2].temperature :
+                                        CELSIUS_TO_KELVIN(act));
+                        }
                         break;
+                }
 
                 name[2] = 'L';
                 status =
@@ -427,7 +473,7 @@ static int acpi_thermal_get_devices(struct acpi_thermal *tz)
 
 static int acpi_thermal_critical(struct acpi_thermal *tz)
 {
-        if (!tz || !tz->trips.critical.flags.valid)
+        if (!tz || !tz->trips.critical.flags.valid || nocrt)
                 return -EINVAL;
 
         if (tz->temperature >= tz->trips.critical.temperature) {
@@ -449,7 +495,7 @@ static int acpi_thermal_critical(struct acpi_thermal *tz)
 
 static int acpi_thermal_hot(struct acpi_thermal *tz)
 {
-        if (!tz || !tz->trips.hot.flags.valid)
+        if (!tz || !tz->trips.hot.flags.valid || nocrt)
                 return -EINVAL;
 
         if (tz->temperature >= tz->trips.hot.temperature) {
@@ -824,12 +870,14 @@ static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
                 goto end;
 
         if (tz->trips.critical.flags.valid)
-                seq_printf(seq, "critical (S5):           %ld C\n",
-                           KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
+                seq_printf(seq, "critical (S5):           %ld C%s",
+                           KELVIN_TO_CELSIUS(tz->trips.critical.temperature),
+                           nocrt ? " <disabled>\n" : "\n");
 
         if (tz->trips.hot.flags.valid)
-                seq_printf(seq, "hot (S4):                %ld C\n",
-                           KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
+                seq_printf(seq, "hot (S4):                %ld C%s",
+                           KELVIN_TO_CELSIUS(tz->trips.hot.temperature),
+                           nocrt ? " <disabled>\n" : "\n");
 
         if (tz->trips.passive.flags.valid) {
                 seq_printf(seq,
@@ -1281,11 +1329,78 @@ 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;
+        }
         acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
         if (!acpi_thermal_dir)
                 return -ENODEV;