#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>
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);
static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
size_t, loff_t *);
+static const struct acpi_device_id thermal_device_ids[] = {
+ {ACPI_THERMAL_HID, 0},
+ {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
+
static struct acpi_driver acpi_thermal_driver = {
.name = "thermal",
.class = ACPI_THERMAL_CLASS,
- .ids = ACPI_THERMAL_HID,
+ .ids = thermal_device_ids,
.ops = {
.add = acpi_thermal_add,
.remove = acpi_thermal_remove,
/* 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"));
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 =
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) {
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) {
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,
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;
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