Initial import

1 files changed, 1285 insertions, 0 deletions

diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
new file mode 100644
index 000000000..d24fa1964
--- /dev/null
+++ b/drivers/acpi/thermal.c
@@ -0,0 +1,1285 @@
+/*
+ *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
+ *
+ *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or (at
+ *  your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This driver fully implements the ACPI thermal policy as described in the
+ *  ACPI 2.0 Specification.
+ *
+ *  TBD: 1. Implement passive cooling hysteresis.
+ *       2. Enhance passive cooling (CPU) states/limit interface to support
+ *          concepts of 'multiple limiters', upper/lower limits, etc.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/dmi.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/jiffies.h>
+#include <linux/kmod.h>
+#include <linux/reboot.h>
+#include <linux/device.h>
+#include <linux/thermal.h>
+#include <linux/acpi.h>
+#include <linux/workqueue.h>
+#include <asm/uaccess.h>
+
+#define PREFIX "ACPI: "
+
+#define ACPI_THERMAL_CLASS		"thermal_zone"
+#define ACPI_THERMAL_DEVICE_NAME	"Thermal Zone"
+#define ACPI_THERMAL_NOTIFY_TEMPERATURE	0x80
+#define ACPI_THERMAL_NOTIFY_THRESHOLDS	0x81
+#define ACPI_THERMAL_NOTIFY_DEVICES	0x82
+#define ACPI_THERMAL_NOTIFY_CRITICAL	0xF0
+#define ACPI_THERMAL_NOTIFY_HOT		0xF1
+#define ACPI_THERMAL_MODE_ACTIVE	0x00
+
+#define ACPI_THERMAL_MAX_ACTIVE	10
+#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
+
+#define _COMPONENT		ACPI_THERMAL_COMPONENT
+ACPI_MODULE_NAME("thermal");
+
+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.");
+
+static int crt;
+module_param(crt, int, 0644);
+MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
+
+static int tzp;
+module_param(tzp, int, 0444);
+MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
+
+static int nocrt;
+module_param(nocrt, int, 0);
+MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
+
+static int off;
+module_param(off, int, 0);
+MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
+
+static int psv;
+module_param(psv, int, 0644);
+MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
+
+static struct workqueue_struct *acpi_thermal_pm_queue;
+
+static int acpi_thermal_add(struct acpi_device *device);
+static int acpi_thermal_remove(struct acpi_device *device);
+static void acpi_thermal_notify(struct acpi_device *device, u32 event);
+
+static const struct acpi_device_id  thermal_device_ids[] = {
+	{ACPI_THERMAL_HID, 0},
+	{"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
+
+#ifdef CONFIG_PM_SLEEP
+static int acpi_thermal_suspend(struct device *dev);
+static int acpi_thermal_resume(struct device *dev);
+#else
+#define acpi_thermal_suspend NULL
+#define acpi_thermal_resume NULL
+#endif
+static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
+
+static struct acpi_driver acpi_thermal_driver = {
+	.name = "thermal",
+	.class = ACPI_THERMAL_CLASS,
+	.ids = thermal_device_ids,
+	.ops = {
+		.add = acpi_thermal_add,
+		.remove = acpi_thermal_remove,
+		.notify = acpi_thermal_notify,
+		},
+	.drv.pm = &acpi_thermal_pm,
+};
+
+struct acpi_thermal_state {
+	u8 critical:1;
+	u8 hot:1;
+	u8 passive:1;
+	u8 active:1;
+	u8 reserved:4;
+	int active_index;
+};
+
+struct acpi_thermal_state_flags {
+	u8 valid:1;
+	u8 enabled:1;
+	u8 reserved:6;
+};
+
+struct acpi_thermal_critical {
+	struct acpi_thermal_state_flags flags;
+	unsigned long temperature;
+};
+
+struct acpi_thermal_hot {
+	struct acpi_thermal_state_flags flags;
+	unsigned long temperature;
+};
+
+struct acpi_thermal_passive {
+	struct acpi_thermal_state_flags flags;
+	unsigned long temperature;
+	unsigned long tc1;
+	unsigned long tc2;
+	unsigned long tsp;
+	struct acpi_handle_list devices;
+};
+
+struct acpi_thermal_active {
+	struct acpi_thermal_state_flags flags;
+	unsigned long temperature;
+	struct acpi_handle_list devices;
+};
+
+struct acpi_thermal_trips {
+	struct acpi_thermal_critical critical;
+	struct acpi_thermal_hot hot;
+	struct acpi_thermal_passive passive;
+	struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
+};
+
+struct acpi_thermal_flags {
+	u8 cooling_mode:1;	/* _SCP */
+	u8 devices:1;		/* _TZD */
+	u8 reserved:6;
+};
+
+struct acpi_thermal {
+	struct acpi_device * device;
+	acpi_bus_id name;
+	unsigned long temperature;
+	unsigned long last_temperature;
+	unsigned long polling_frequency;
+	volatile u8 zombie;
+	struct acpi_thermal_flags flags;
+	struct acpi_thermal_state state;
+	struct acpi_thermal_trips trips;
+	struct acpi_handle_list devices;
+	struct thermal_zone_device *thermal_zone;
+	int tz_enabled;
+	int kelvin_offset;
+	struct work_struct thermal_check_work;
+};
+
+/* --------------------------------------------------------------------------
+                             Thermal Zone Management
+   -------------------------------------------------------------------------- */
+
+static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
+{
+	acpi_status status = AE_OK;
+	unsigned long long tmp;
+
+	if (!tz)
+		return -EINVAL;
+
+	tz->last_temperature = tz->temperature;
+
+	status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
+	if (ACPI_FAILURE(status))
+		return -ENODEV;
+
+	tz->temperature = tmp;
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
+			  tz->temperature));
+
+	return 0;
+}
+
+static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
+{
+	acpi_status status = AE_OK;
+	unsigned long long tmp;
+
+	if (!tz)
+		return -EINVAL;
+
+	status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
+	if (ACPI_FAILURE(status))
+		return -ENODEV;
+
+	tz->polling_frequency = tmp;
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
+			  tz->polling_frequency));
+
+	return 0;
+}
+
+static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
+{
+	if (!tz)
+		return -EINVAL;
+
+	if (!acpi_has_method(tz->device->handle, "_SCP")) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
+		return -ENODEV;
+	} else if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
+							   "_SCP", mode))) {
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+#define ACPI_TRIPS_CRITICAL	0x01
+#define ACPI_TRIPS_HOT		0x02
+#define ACPI_TRIPS_PASSIVE	0x04
+#define ACPI_TRIPS_ACTIVE	0x08
+#define ACPI_TRIPS_DEVICES	0x10
+
+#define ACPI_TRIPS_REFRESH_THRESHOLDS	(ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
+#define ACPI_TRIPS_REFRESH_DEVICES	ACPI_TRIPS_DEVICES
+
+#define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |	\
+			      ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |	\
+			      ACPI_TRIPS_DEVICES)
+
+/*
+ * This exception is thrown out in two cases:
+ * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
+ *   when re-evaluating the AML code.
+ * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
+ *   We need to re-bind the cooling devices of a thermal zone when this occurs.
+ */
+#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)	\
+do {	\
+	if (flags != ACPI_TRIPS_INIT)	\
+		ACPI_EXCEPTION((AE_INFO, AE_ERROR,	\
+		"ACPI thermal trip point %s changed\n"	\
+		"Please send acpidump to linux-acpi@vger.kernel.org", str)); \
+} while (0)
+
+static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
+{
+	acpi_status status = AE_OK;
+	unsigned long long tmp;
+	struct acpi_handle_list devices;
+	int valid = 0;
+	int i;
+
+	/* Critical Shutdown */
+	if (flag & ACPI_TRIPS_CRITICAL) {
+		status = acpi_evaluate_integer(tz->device->handle,
+				"_CRT", NULL, &tmp);
+		tz->trips.critical.temperature = tmp;
+		/*
+		 * Treat freezing temperatures as invalid as well; some
+		 * BIOSes return really low values and cause reboots at startup.
+		 * Below zero (Celsius) values clearly aren't right for sure..
+		 * ... so lets discard those as invalid.
+		 */
+		if (ACPI_FAILURE(status)) {
+			tz->trips.critical.flags.valid = 0;
+			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+					  "No critical threshold\n"));
+		} else if (tmp <= 2732) {
+			pr_warn(FW_BUG "Invalid critical threshold (%llu)\n",
+				tmp);
+			tz->trips.critical.flags.valid = 0;
+		} else {
+			tz->trips.critical.flags.valid = 1;
+			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+					  "Found critical threshold [%lu]\n",
+					  tz->trips.critical.temperature));
+		}
+		if (tz->trips.critical.flags.valid == 1) {
+			if (crt == -1) {
+				tz->trips.critical.flags.valid = 0;
+			} else if (crt > 0) {
+				unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
+				/*
+				 * Allow override critical threshold
+				 */
+				if (crt_k > tz->trips.critical.temperature)
+					pr_warn(PREFIX "Critical threshold %d C\n",
+						crt);
+				tz->trips.critical.temperature = crt_k;
+			}
+		}
+	}
+
+	/* Critical Sleep (optional) */
+	if (flag & ACPI_TRIPS_HOT) {
+		status = acpi_evaluate_integer(tz->device->handle,
+				"_HOT", NULL, &tmp);
+		if (ACPI_FAILURE(status)) {
+			tz->trips.hot.flags.valid = 0;
+			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+					"No hot threshold\n"));
+		} else {
+			tz->trips.hot.temperature = tmp;
+			tz->trips.hot.flags.valid = 1;
+			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+					"Found hot threshold [%lu]\n",
+					tz->trips.hot.temperature));
+		}
+	}
+
+	/* Passive (optional) */
+	if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
+		(flag == ACPI_TRIPS_INIT)) {
+		valid = tz->trips.passive.flags.valid;
+		if (psv == -1) {
+			status = AE_SUPPORT;
+		} else if (psv > 0) {
+			tmp = CELSIUS_TO_KELVIN(psv);
+			status = AE_OK;
+		} else {
+			status = acpi_evaluate_integer(tz->device->handle,
+				"_PSV", NULL, &tmp);
+		}
+
+		if (ACPI_FAILURE(status))
+			tz->trips.passive.flags.valid = 0;
+		else {
+			tz->trips.passive.temperature = tmp;
+			tz->trips.passive.flags.valid = 1;
+			if (flag == ACPI_TRIPS_INIT) {
+				status = acpi_evaluate_integer(
+						tz->device->handle, "_TC1",
+						NULL, &tmp);
+				if (ACPI_FAILURE(status))
+					tz->trips.passive.flags.valid = 0;
+				else
+					tz->trips.passive.tc1 = tmp;
+				status = acpi_evaluate_integer(
+						tz->device->handle, "_TC2",
+						NULL, &tmp);
+				if (ACPI_FAILURE(status))
+					tz->trips.passive.flags.valid = 0;
+				else
+					tz->trips.passive.tc2 = tmp;
+				status = acpi_evaluate_integer(
+						tz->device->handle, "_TSP",
+						NULL, &tmp);
+				if (ACPI_FAILURE(status))
+					tz->trips.passive.flags.valid = 0;
+				else
+					tz->trips.passive.tsp = tmp;
+			}
+		}
+	}
+	if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
+		memset(&devices, 0, sizeof(struct acpi_handle_list));
+		status = acpi_evaluate_reference(tz->device->handle, "_PSL",
+							NULL, &devices);
+		if (ACPI_FAILURE(status)) {
+			pr_warn(PREFIX "Invalid passive threshold\n");
+			tz->trips.passive.flags.valid = 0;
+		}
+		else
+			tz->trips.passive.flags.valid = 1;
+
+		if (memcmp(&tz->trips.passive.devices, &devices,
+				sizeof(struct acpi_handle_list))) {
+			memcpy(&tz->trips.passive.devices, &devices,
+				sizeof(struct acpi_handle_list));
+			ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
+		}
+	}
+	if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
+		if (valid != tz->trips.passive.flags.valid)
+				ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
+	}
+
+	/* Active (optional) */
+	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
+		char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
+		valid = tz->trips.active[i].flags.valid;
+
+		if (act == -1)
+			break; /* disable all active trip points */
+
+		if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
+			tz->trips.active[i].flags.valid)) {
+			status = acpi_evaluate_integer(tz->device->handle,
+							name, NULL, &tmp);
+			if (ACPI_FAILURE(status)) {
+				tz->trips.active[i].flags.valid = 0;
+				if (i == 0)
+					break;
+				if (act <= 0)
+					break;
+				if (i == 1)
+					tz->trips.active[0].temperature =
+						CELSIUS_TO_KELVIN(act);
+				else
+					/*
+					 * 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;
+			} else {
+				tz->trips.active[i].temperature = tmp;
+				tz->trips.active[i].flags.valid = 1;
+			}
+		}
+
+		name[2] = 'L';
+		if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
+			memset(&devices, 0, sizeof(struct acpi_handle_list));
+			status = acpi_evaluate_reference(tz->device->handle,
+						name, NULL, &devices);
+			if (ACPI_FAILURE(status)) {
+				pr_warn(PREFIX "Invalid active%d threshold\n",
+					i);
+				tz->trips.active[i].flags.valid = 0;
+			}
+			else
+				tz->trips.active[i].flags.valid = 1;
+
+			if (memcmp(&tz->trips.active[i].devices, &devices,
+					sizeof(struct acpi_handle_list))) {
+				memcpy(&tz->trips.active[i].devices, &devices,
+					sizeof(struct acpi_handle_list));
+				ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
+			}
+		}
+		if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
+			if (valid != tz->trips.active[i].flags.valid)
+				ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
+
+		if (!tz->trips.active[i].flags.valid)
+			break;
+	}
+
+	if ((flag & ACPI_TRIPS_DEVICES)
+	    && acpi_has_method(tz->device->handle, "_TZD")) {
+		memset(&devices, 0, sizeof(devices));
+		status = acpi_evaluate_reference(tz->device->handle, "_TZD",
+						NULL, &devices);
+		if (ACPI_SUCCESS(status)
+		    && memcmp(&tz->devices, &devices, sizeof(devices))) {
+			tz->devices = devices;
+			ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
+		}
+	}
+
+	return 0;
+}
+
+static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
+{
+	int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
+
+	if (ret)
+		return ret;
+
+	valid = tz->trips.critical.flags.valid |
+		tz->trips.hot.flags.valid |
+		tz->trips.passive.flags.valid;
+
+	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
+		valid |= tz->trips.active[i].flags.valid;
+
+	if (!valid) {
+		pr_warn(FW_BUG "No valid trip found\n");
+		return -ENODEV;
+	}
+	return 0;
+}
+
+static void acpi_thermal_check(void *data)
+{
+	struct acpi_thermal *tz = data;
+
+	if (!tz->tz_enabled)
+		return;
+
+	thermal_zone_device_update(tz->thermal_zone);
+}
+
+/* sys I/F for generic thermal sysfs support */
+
+static int thermal_get_temp(struct thermal_zone_device *thermal,
+			    unsigned long *temp)
+{
+	struct acpi_thermal *tz = thermal->devdata;
+	int result;
+
+	if (!tz)
+		return -EINVAL;
+
+	result = acpi_thermal_get_temperature(tz);
+	if (result)
+		return result;
+
+	*temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(tz->temperature,
+							tz->kelvin_offset);
+	return 0;
+}
+
+static int thermal_get_mode(struct thermal_zone_device *thermal,
+				enum thermal_device_mode *mode)
+{
+	struct acpi_thermal *tz = thermal->devdata;
+
+	if (!tz)
+		return -EINVAL;
+
+	*mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
+		THERMAL_DEVICE_DISABLED;
+
+	return 0;
+}
+
+static int thermal_set_mode(struct thermal_zone_device *thermal,
+				enum thermal_device_mode mode)
+{
+	struct acpi_thermal *tz = thermal->devdata;
+	int enable;
+
+	if (!tz)
+		return -EINVAL;
+
+	/*
+	 * enable/disable thermal management from ACPI thermal driver
+	 */
+	if (mode == THERMAL_DEVICE_ENABLED)
+		enable = 1;
+	else if (mode == THERMAL_DEVICE_DISABLED) {
+		enable = 0;
+		pr_warn("thermal zone will be disabled\n");
+	} else
+		return -EINVAL;
+
+	if (enable != tz->tz_enabled) {
+		tz->tz_enabled = enable;
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+			"%s kernel ACPI thermal control\n",
+			tz->tz_enabled ? "Enable" : "Disable"));
+		acpi_thermal_check(tz);
+	}
+	return 0;
+}
+
+static int thermal_get_trip_type(struct thermal_zone_device *thermal,
+				 int trip, enum thermal_trip_type *type)
+{
+	struct acpi_thermal *tz = thermal->devdata;
+	int i;
+
+	if (!tz || trip < 0)
+		return -EINVAL;
+
+	if (tz->trips.critical.flags.valid) {
+		if (!trip) {
+			*type = THERMAL_TRIP_CRITICAL;
+			return 0;
+		}
+		trip--;
+	}
+
+	if (tz->trips.hot.flags.valid) {
+		if (!trip) {
+			*type = THERMAL_TRIP_HOT;
+			return 0;
+		}
+		trip--;
+	}
+
+	if (tz->trips.passive.flags.valid) {
+		if (!trip) {
+			*type = THERMAL_TRIP_PASSIVE;
+			return 0;
+		}
+		trip--;
+	}
+
+	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
+		tz->trips.active[i].flags.valid; i++) {
+		if (!trip) {
+			*type = THERMAL_TRIP_ACTIVE;
+			return 0;
+		}
+		trip--;
+	}
+
+	return -EINVAL;
+}
+
+static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
+				 int trip, unsigned long *temp)
+{
+	struct acpi_thermal *tz = thermal->devdata;
+	int i;
+
+	if (!tz || trip < 0)
+		return -EINVAL;
+
+	if (tz->trips.critical.flags.valid) {
+		if (!trip) {
+			*temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
+				tz->trips.critical.temperature,
+				tz->kelvin_offset);
+			return 0;
+		}
+		trip--;
+	}
+
+	if (tz->trips.hot.flags.valid) {
+		if (!trip) {
+			*temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
+				tz->trips.hot.temperature,
+				tz->kelvin_offset);
+			return 0;
+		}
+		trip--;
+	}
+
+	if (tz->trips.passive.flags.valid) {
+		if (!trip) {
+			*temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
+				tz->trips.passive.temperature,
+				tz->kelvin_offset);
+			return 0;
+		}
+		trip--;
+	}
+
+	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
+		tz->trips.active[i].flags.valid; i++) {
+		if (!trip) {
+			*temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
+				tz->trips.active[i].temperature,
+				tz->kelvin_offset);
+			return 0;
+		}
+		trip--;
+	}
+
+	return -EINVAL;
+}
+
+static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
+				unsigned long *temperature) {
+	struct acpi_thermal *tz = thermal->devdata;
+
+	if (tz->trips.critical.flags.valid) {
+		*temperature = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
+				tz->trips.critical.temperature,
+				tz->kelvin_offset);
+		return 0;
+	} else
+		return -EINVAL;
+}
+
+static int thermal_get_trend(struct thermal_zone_device *thermal,
+				int trip, enum thermal_trend *trend)
+{
+	struct acpi_thermal *tz = thermal->devdata;
+	enum thermal_trip_type type;
+	int i;
+
+	if (thermal_get_trip_type(thermal, trip, &type))
+		return -EINVAL;
+
+	if (type == THERMAL_TRIP_ACTIVE) {
+		unsigned long trip_temp;
+		unsigned long temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
+					tz->temperature, tz->kelvin_offset);
+		if (thermal_get_trip_temp(thermal, trip, &trip_temp))
+			return -EINVAL;
+
+		if (temp > trip_temp) {
+			*trend = THERMAL_TREND_RAISING;
+			return 0;
+		} else {
+			/* Fall back on default trend */
+			return -EINVAL;
+		}
+	}
+
+	/*
+	 * tz->temperature has already been updated by generic thermal layer,
+	 * before this callback being invoked
+	 */
+	i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
+		+ (tz->trips.passive.tc2
+		* (tz->temperature - tz->trips.passive.temperature));
+
+	if (i > 0)
+		*trend = THERMAL_TREND_RAISING;
+	else if (i < 0)
+		*trend = THERMAL_TREND_DROPPING;
+	else
+		*trend = THERMAL_TREND_STABLE;
+	return 0;
+}
+
+
+static int thermal_notify(struct thermal_zone_device *thermal, int trip,
+			   enum thermal_trip_type trip_type)
+{
+	u8 type = 0;
+	struct acpi_thermal *tz = thermal->devdata;
+
+	if (trip_type == THERMAL_TRIP_CRITICAL)
+		type = ACPI_THERMAL_NOTIFY_CRITICAL;
+	else if (trip_type == THERMAL_TRIP_HOT)
+		type = ACPI_THERMAL_NOTIFY_HOT;
+	else
+		return 0;
+
+	acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
+					dev_name(&tz->device->dev), type, 1);
+
+	if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
+		return 1;
+
+	return 0;
+}
+
+static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
+					struct thermal_cooling_device *cdev,
+					bool bind)
+{
+	struct acpi_device *device = cdev->devdata;
+	struct acpi_thermal *tz = thermal->devdata;
+	struct acpi_device *dev;
+	acpi_status status;
+	acpi_handle handle;
+	int i;
+	int j;
+	int trip = -1;
+	int result = 0;
+
+	if (tz->trips.critical.flags.valid)
+		trip++;
+
+	if (tz->trips.hot.flags.valid)
+		trip++;
+
+	if (tz->trips.passive.flags.valid) {
+		trip++;
+		for (i = 0; i < tz->trips.passive.devices.count;
+		    i++) {
+			handle = tz->trips.passive.devices.handles[i];
+			status = acpi_bus_get_device(handle, &dev);
+			if (ACPI_FAILURE(status) || dev != device)
+				continue;
+			if (bind)
+				result =
+					thermal_zone_bind_cooling_device
+					(thermal, trip, cdev,
+					 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
+			else
+				result =
+					thermal_zone_unbind_cooling_device
+					(thermal, trip, cdev);
+			if (result)
+				goto failed;
+		}
+	}
+
+	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
+		if (!tz->trips.active[i].flags.valid)
+			break;
+		trip++;
+		for (j = 0;
+		    j < tz->trips.active[i].devices.count;
+		    j++) {
+			handle = tz->trips.active[i].devices.handles[j];
+			status = acpi_bus_get_device(handle, &dev);
+			if (ACPI_FAILURE(status) || dev != device)
+				continue;
+			if (bind)
+				result = thermal_zone_bind_cooling_device
+					(thermal, trip, cdev,
+					 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
+			else
+				result = thermal_zone_unbind_cooling_device
+					(thermal, trip, cdev);
+			if (result)
+				goto failed;
+		}
+	}
+
+	for (i = 0; i < tz->devices.count; i++) {
+		handle = tz->devices.handles[i];
+		status = acpi_bus_get_device(handle, &dev);
+		if (ACPI_SUCCESS(status) && (dev == device)) {
+			if (bind)
+				result = thermal_zone_bind_cooling_device
+						(thermal, THERMAL_TRIPS_NONE,
+						 cdev, THERMAL_NO_LIMIT,
+						 THERMAL_NO_LIMIT);
+			else
+				result = thermal_zone_unbind_cooling_device
+						(thermal, THERMAL_TRIPS_NONE,
+						 cdev);
+			if (result)
+				goto failed;
+		}
+	}
+
+failed:
+	return result;
+}
+
+static int
+acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
+					struct thermal_cooling_device *cdev)
+{
+	return acpi_thermal_cooling_device_cb(thermal, cdev, true);
+}
+
+static int
+acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
+					struct thermal_cooling_device *cdev)
+{
+	return acpi_thermal_cooling_device_cb(thermal, cdev, false);
+}
+
+static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
+	.bind = acpi_thermal_bind_cooling_device,
+	.unbind	= acpi_thermal_unbind_cooling_device,
+	.get_temp = thermal_get_temp,
+	.get_mode = thermal_get_mode,
+	.set_mode = thermal_set_mode,
+	.get_trip_type = thermal_get_trip_type,
+	.get_trip_temp = thermal_get_trip_temp,
+	.get_crit_temp = thermal_get_crit_temp,
+	.get_trend = thermal_get_trend,
+	.notify = thermal_notify,
+};
+
+static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
+{
+	int trips = 0;
+	int result;
+	acpi_status status;
+	int i;
+
+	if (tz->trips.critical.flags.valid)
+		trips++;
+
+	if (tz->trips.hot.flags.valid)
+		trips++;
+
+	if (tz->trips.passive.flags.valid)
+		trips++;
+
+	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
+			tz->trips.active[i].flags.valid; i++, trips++);
+
+	if (tz->trips.passive.flags.valid)
+		tz->thermal_zone =
+			thermal_zone_device_register("acpitz", trips, 0, tz,
+						&acpi_thermal_zone_ops, NULL,
+						     tz->trips.passive.tsp*100,
+						     tz->polling_frequency*100);
+	else
+		tz->thermal_zone =
+			thermal_zone_device_register("acpitz", trips, 0, tz,
+						&acpi_thermal_zone_ops, NULL,
+						0, tz->polling_frequency*100);
+	if (IS_ERR(tz->thermal_zone))
+		return -ENODEV;
+
+	result = sysfs_create_link(&tz->device->dev.kobj,
+				   &tz->thermal_zone->device.kobj, "thermal_zone");
+	if (result)
+		return result;
+
+	result = sysfs_create_link(&tz->thermal_zone->device.kobj,
+				   &tz->device->dev.kobj, "device");
+	if (result)
+		return result;
+
+	status =  acpi_bus_attach_private_data(tz->device->handle,
+					       tz->thermal_zone);
+	if (ACPI_FAILURE(status))
+		return -ENODEV;
+
+	tz->tz_enabled = 1;
+
+	dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
+		 tz->thermal_zone->id);
+	return 0;
+}
+
+static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
+{
+	sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
+	sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
+	thermal_zone_device_unregister(tz->thermal_zone);
+	tz->thermal_zone = NULL;
+	acpi_bus_detach_private_data(tz->device->handle);
+}
+
+
+/* --------------------------------------------------------------------------
+                                 Driver Interface
+   -------------------------------------------------------------------------- */
+
+static void acpi_thermal_notify(struct acpi_device *device, u32 event)
+{
+	struct acpi_thermal *tz = acpi_driver_data(device);
+
+
+	if (!tz)
+		return;
+
+	switch (event) {
+	case ACPI_THERMAL_NOTIFY_TEMPERATURE:
+		acpi_thermal_check(tz);
+		break;
+	case ACPI_THERMAL_NOTIFY_THRESHOLDS:
+		acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
+		acpi_thermal_check(tz);
+		acpi_bus_generate_netlink_event(device->pnp.device_class,
+						  dev_name(&device->dev), event, 0);
+		break;
+	case ACPI_THERMAL_NOTIFY_DEVICES:
+		acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
+		acpi_thermal_check(tz);
+		acpi_bus_generate_netlink_event(device->pnp.device_class,
+						  dev_name(&device->dev), event, 0);
+		break;
+	default:
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+				  "Unsupported event [0x%x]\n", event));
+		break;
+	}
+}
+
+/*
+ * On some platforms, the AML code has dependency about
+ * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
+ * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
+ *    /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
+ * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
+ *    if _TMP has never been evaluated.
+ *
+ * As this dependency is totally transparent to OS, evaluate
+ * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
+ * _TMP, before they are actually used.
+ */
+static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
+{
+	acpi_handle handle = tz->device->handle;
+	unsigned long long value;
+	int i;
+
+	acpi_evaluate_integer(handle, "_CRT", NULL, &value);
+	acpi_evaluate_integer(handle, "_HOT", NULL, &value);
+	acpi_evaluate_integer(handle, "_PSV", NULL, &value);
+	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
+		char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
+		acpi_status status;
+
+		status = acpi_evaluate_integer(handle, name, NULL, &value);
+		if (status == AE_NOT_FOUND)
+			break;
+	}
+	acpi_evaluate_integer(handle, "_TMP", NULL, &value);
+}
+
+static int acpi_thermal_get_info(struct acpi_thermal *tz)
+{
+	int result = 0;
+
+
+	if (!tz)
+		return -EINVAL;
+
+	acpi_thermal_aml_dependency_fix(tz);
+
+	/* Get trip points [_CRT, _PSV, etc.] (required) */
+	result = acpi_thermal_get_trip_points(tz);
+	if (result)
+		return result;
+
+	/* Get temperature [_TMP] (required) */
+	result = acpi_thermal_get_temperature(tz);
+	if (result)
+		return result;
+
+	/* Set the cooling mode [_SCP] to active cooling (default) */
+	result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
+	if (!result)
+		tz->flags.cooling_mode = 1;
+
+	/* Get default polling frequency [_TZP] (optional) */
+	if (tzp)
+		tz->polling_frequency = tzp;
+	else
+		acpi_thermal_get_polling_frequency(tz);
+
+	return 0;
+}
+
+/*
+ * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
+ * handles temperature values with a single decimal place. As a consequence,
+ * some implementations use an offset of 273.1 and others use an offset of
+ * 273.2. Try to find out which one is being used, to present the most
+ * accurate and visually appealing number.
+ *
+ * The heuristic below should work for all ACPI thermal zones which have a
+ * critical trip point with a value being a multiple of 0.5 degree Celsius.
+ */
+static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
+{
+	if (tz->trips.critical.flags.valid &&
+	    (tz->trips.critical.temperature % 5) == 1)
+		tz->kelvin_offset = 2731;
+	else
+		tz->kelvin_offset = 2732;
+}
+
+static void acpi_thermal_check_fn(struct work_struct *work)
+{
+	struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
+					       thermal_check_work);
+	acpi_thermal_check(tz);
+}
+
+static int acpi_thermal_add(struct acpi_device *device)
+{
+	int result = 0;
+	struct acpi_thermal *tz = NULL;
+
+
+	if (!device)
+		return -EINVAL;
+
+	tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
+	if (!tz)
+		return -ENOMEM;
+
+	tz->device = device;
+	strcpy(tz->name, device->pnp.bus_id);
+	strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
+	strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
+	device->driver_data = tz;
+
+	result = acpi_thermal_get_info(tz);
+	if (result)
+		goto free_memory;
+
+	acpi_thermal_guess_offset(tz);
+
+	result = acpi_thermal_register_thermal_zone(tz);
+	if (result)
+		goto free_memory;
+
+	INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
+
+	pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
+		acpi_device_bid(device), KELVIN_TO_CELSIUS(tz->temperature));
+	goto end;
+
+free_memory:
+	kfree(tz);
+end:
+	return result;
+}
+
+static int acpi_thermal_remove(struct acpi_device *device)
+{
+	struct acpi_thermal *tz = NULL;
+
+	if (!device || !acpi_driver_data(device))
+		return -EINVAL;
+
+	flush_workqueue(acpi_thermal_pm_queue);
+	tz = acpi_driver_data(device);
+
+	acpi_thermal_unregister_thermal_zone(tz);
+	kfree(tz);
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int acpi_thermal_suspend(struct device *dev)
+{
+	/* Make sure the previously queued thermal check work has been done */
+	flush_workqueue(acpi_thermal_pm_queue);
+	return 0;
+}
+
+static int acpi_thermal_resume(struct device *dev)
+{
+	struct acpi_thermal *tz;
+	int i, j, power_state, result;
+
+	if (!dev)
+		return -EINVAL;
+
+	tz = acpi_driver_data(to_acpi_device(dev));
+	if (!tz)
+		return -EINVAL;
+
+	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
+		if (!(&tz->trips.active[i]))
+			break;
+		if (!tz->trips.active[i].flags.valid)
+			break;
+		tz->trips.active[i].flags.enabled = 1;
+		for (j = 0; j < tz->trips.active[i].devices.count; j++) {
+			result = acpi_bus_update_power(
+					tz->trips.active[i].devices.handles[j],
+					&power_state);
+			if (result || (power_state != ACPI_STATE_D0)) {
+				tz->trips.active[i].flags.enabled = 0;
+				break;
+			}
+		}
+		tz->state.active |= tz->trips.active[i].flags.enabled;
+	}
+
+	queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
+
+	return AE_OK;
+}
+#endif
+
+static int thermal_act(const struct dmi_system_id *d) {
+
+	if (act == 0) {
+		pr_notice(PREFIX "%s detected: "
+			  "disabling all active thermal trip points\n", d->ident);
+		act = -1;
+	}
+	return 0;
+}
+static int thermal_nocrt(const struct dmi_system_id *d) {
+
+	pr_notice(PREFIX "%s detected: "
+		  "disabling all critical thermal trip point actions.\n", d->ident);
+	nocrt = 1;
+	return 0;
+}
+static int thermal_tzp(const struct dmi_system_id *d) {
+
+	if (tzp == 0) {
+		pr_notice(PREFIX "%s detected: "
+			  "enabling thermal zone polling\n", d->ident);
+		tzp = 300;	/* 300 dS = 30 Seconds */
+	}
+	return 0;
+}
+static int thermal_psv(const struct dmi_system_id *d) {
+
+	if (psv == 0) {
+		pr_notice(PREFIX "%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"),
+		},
+	},
+	{
+	 .callback = thermal_nocrt,
+	 .ident = "Gigabyte GA-7ZX",
+	 .matches = {
+		DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
+		DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
+		},
+	},
+	{}
+};
+
+static int __init acpi_thermal_init(void)
+{
+	int result = 0;
+
+	dmi_check_system(thermal_dmi_table);
+
+	if (off) {
+		pr_notice(PREFIX "thermal control disabled\n");
+		return -ENODEV;
+	}
+
+	acpi_thermal_pm_queue = create_workqueue("acpi_thermal_pm");
+	if (!acpi_thermal_pm_queue)
+		return -ENODEV;
+
+	result = acpi_bus_register_driver(&acpi_thermal_driver);
+	if (result < 0) {
+		destroy_workqueue(acpi_thermal_pm_queue);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static void __exit acpi_thermal_exit(void)
+{
+	acpi_bus_unregister_driver(&acpi_thermal_driver);
+	destroy_workqueue(acpi_thermal_pm_queue);
+
+	return;
+}
+
+module_init(acpi_thermal_init);
+module_exit(acpi_thermal_exit);