};
MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
+#ifdef CONFIG_PM_SLEEP
static int acpi_thermal_resume(struct device *dev);
+#endif
static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, NULL, acpi_thermal_resume);
static struct acpi_driver acpi_thermal_driver = {
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) {
+ /* aggressive active cooling */
+ *trend = THERMAL_TREND_RAISING;
+ return 0;
+ }
+
+ /*
+ * 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)
{
return 0;
}
- typedef int (*cb)(struct thermal_zone_device *, int,
- struct thermal_cooling_device *);
static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
struct thermal_cooling_device *cdev,
- cb action)
+ bool bind)
{
struct acpi_device *device = cdev->devdata;
struct acpi_thermal *tz = thermal->devdata;
i++) {
handle = tz->trips.passive.devices.handles[i];
status = acpi_bus_get_device(handle, &dev);
- if (ACPI_SUCCESS(status) && (dev == device)) {
- result = action(thermal, trip, cdev);
- if (result)
- goto failed;
- }
+ 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;
}
}
j++) {
handle = tz->trips.active[i].devices.handles[j];
status = acpi_bus_get_device(handle, &dev);
- if (ACPI_SUCCESS(status) && (dev == device)) {
- result = action(thermal, trip, cdev);
- if (result)
- goto failed;
- }
+ 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;
}
}
handle = tz->devices.handles[i];
status = acpi_bus_get_device(handle, &dev);
if (ACPI_SUCCESS(status) && (dev == device)) {
- result = action(thermal, -1, cdev);
+ if (bind)
+ result = thermal_zone_bind_cooling_device
+ (thermal, -1, cdev,
+ THERMAL_NO_LIMIT,
+ THERMAL_NO_LIMIT);
+ else
+ result = thermal_zone_unbind_cooling_device
+ (thermal, -1, cdev);
if (result)
goto failed;
}
acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
struct thermal_cooling_device *cdev)
{
- return acpi_thermal_cooling_device_cb(thermal, cdev,
- thermal_zone_bind_cooling_device);
+ 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,
- thermal_zone_unbind_cooling_device);
+ return acpi_thermal_cooling_device_cb(thermal, cdev, false);
}
static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
.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,
};
tz->thermal_zone =
thermal_zone_device_register("acpitz", trips, 0, tz,
&acpi_thermal_zone_ops,
- tz->trips.passive.tc1,
- tz->trips.passive.tc2,
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,
- 0, 0, 0,
+ &acpi_thermal_zone_ops, 0,
tz->polling_frequency*100);
if (IS_ERR(tz->thermal_zone))
return -ENODEV;
return 0;
}
+#ifdef CONFIG_PM_SLEEP
static int acpi_thermal_resume(struct device *dev)
{
struct acpi_thermal *tz;
return AE_OK;
}
+#endif
static int thermal_act(const struct dmi_system_id *d) {
config SENSORS_ABITUGURU
tristate "Abit uGuru (rev 1 & 2)"
- depends on X86 && DMI && EXPERIMENTAL
+ depends on X86 && DMI
help
If you say yes here you get support for the sensor part of the first
and second revision of the Abit uGuru chip. The voltage and frequency
config SENSORS_ABITUGURU3
tristate "Abit uGuru (rev 3)"
- depends on X86 && DMI && EXPERIMENTAL
+ depends on X86 && DMI
help
If you say yes here you get support for the sensor part of the
third revision of the Abit uGuru chip. Only reading the sensors
config SENSORS_AD7314
tristate "Analog Devices AD7314 and compatibles"
- depends on SPI && EXPERIMENTAL
+ depends on SPI
help
If you say yes here you get support for the Analog Devices
AD7314, ADT7301 and ADT7302 temperature sensors.
config SENSORS_AD7414
tristate "Analog Devices AD7414"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for the Analog Devices
AD7414 temperature monitoring chip.
config SENSORS_AD7418
tristate "Analog Devices AD7416, AD7417 and AD7418"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for the Analog Devices
AD7416, AD7417 and AD7418 temperature monitoring chips.
config SENSORS_ADCXX
tristate "National Semiconductor ADCxxxSxxx"
- depends on SPI_MASTER && EXPERIMENTAL
+ depends on SPI_MASTER
help
If you say yes here you get support for the National Semiconductor
ADC<bb><c>S<sss> chip family, where
This driver can also be built as a module. If so, the module
will be called adm9240.
+config SENSORS_ADT7410
+ tristate "Analog Devices ADT7410"
+ depends on I2C
+ help
+ If you say yes here you get support for the Analog Devices
+ ADT7410 temperature monitoring chip.
+
+ This driver can also be built as a module. If so, the module
+ will be called adt7410.
+
config SENSORS_ADT7411
tristate "Analog Devices ADT7411"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for the Analog Devices
ADT7411 voltage and temperature monitoring chip.
config SENSORS_ADT7462
tristate "Analog Devices ADT7462"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for the Analog Devices
ADT7462 temperature monitoring chips.
config SENSORS_ADT7470
tristate "Analog Devices ADT7470"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for the Analog Devices
ADT7470 temperature monitoring chips.
config SENSORS_K8TEMP
tristate "AMD Athlon64/FX or Opteron temperature sensor"
- depends on X86 && PCI && EXPERIMENTAL
+ depends on X86 && PCI
help
If you say yes here you get support for the temperature
sensor(s) inside your CPU. Supported is whole AMD K8
config SENSORS_ASB100
tristate "Asus ASB100 Bach"
- depends on X86 && I2C && EXPERIMENTAL
+ depends on X86 && I2C
select HWMON_VID
help
If you say yes here you get support for the ASB100 Bach sensor
config SENSORS_ATXP1
tristate "Attansic ATXP1 VID controller"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
select HWMON_VID
help
If you say yes here you get support for the Attansic ATXP1 VID
This driver can also be built as module. If so, the module
will be called da9052-hwmon.
- config SENSORS_EXYNOS4_TMU
- tristate "Temperature sensor on Samsung EXYNOS4"
- depends on ARCH_EXYNOS4
- help
- If you say yes here you get support for TMU (Thermal Management
- Unit) on SAMSUNG EXYNOS4 series of SoC.
-
- This driver can also be built as a module. If so, the module
- will be called exynos4-tmu.
-
config SENSORS_I5K_AMB
tristate "FB-DIMM AMB temperature sensor on Intel 5000 series chipsets"
- depends on PCI && EXPERIMENTAL
+ depends on PCI
help
If you say yes here you get support for FB-DIMM AMB temperature
monitoring chips on systems with the Intel 5000 series chipset.
config SENSORS_HIH6130
tristate "Honeywell Humidicon HIH-6130 humidity/temperature sensor"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for Honeywell Humidicon
HIH-6130 and HIH-6131 Humidicon humidity sensors.
config SENSORS_CORETEMP
tristate "Intel Core/Core2/Atom temperature sensor"
- depends on X86 && PCI && EXPERIMENTAL
+ depends on X86 && PCI
help
If you say yes here you get support for the temperature
sensor inside your CPU. Most of the family 6 CPUs
select HWMON_VID
help
If you say yes here you get support for ITE IT8705F, IT8712F,
- IT8716F, IT8718F, IT8720F, IT8721F, IT8726F, IT8728F and IT8758E
- sensor chips, and the SiS960 clone.
+ IT8716F, IT8718F, IT8720F, IT8721F, IT8726F, IT8728F, IT8758E,
+ IT8782F, and IT8783E/F sensor chips, and the SiS950 clone.
This driver can also be built as a module. If so, the module
will be called it87.
config SENSORS_LINEAGE
tristate "Lineage Compact Power Line Power Entry Module"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for the Lineage Compact Power Line
series of DC/DC and AC/DC converters such as CP1800, CP2000AC,
will be called lm63.
config SENSORS_LM70
- tristate "National Semiconductor LM70 / Texas Instruments TMP121"
+ tristate "National Semiconductor LM70 and compatibles"
depends on SPI_MASTER
help
If you say yes here you get support for the National Semiconductor
- LM70 and Texas Instruments TMP121/TMP123 digital temperature
- sensor chips.
+ LM70, LM71, LM74 and Texas Instruments TMP121/TMP123 digital tempera-
+ ture sensor chips.
This driver can also be built as a module. If so, the module
will be called lm70.
config SENSORS_LTC4215
tristate "Linear Technology LTC4215"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
default n
help
If you say yes here you get support for Linear Technology LTC4215
config SENSORS_LTC4245
tristate "Linear Technology LTC4245"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
default n
help
If you say yes here you get support for Linear Technology LTC4245
config SENSORS_LTC4261
tristate "Linear Technology LTC4261"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
default n
help
If you say yes here you get support for Linear Technology LTC4261
config SENSORS_LM95245
tristate "National Semiconductor LM95245 sensor chip"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for LM95245 sensor chip.
will be called lm95245.
config SENSORS_MAX1111
- tristate "Maxim MAX1111 Multichannel, Serial 8-bit ADC chip"
+ tristate "Maxim MAX1111 Serial 8-bit ADC chip and compatibles"
depends on SPI_MASTER
help
- Say y here to support Maxim's MAX1111 ADC chips.
+ Say y here to support Maxim's MAX1110, MAX1111, MAX1112, and MAX1113
+ ADC chips.
This driver can also be built as a module. If so, the module
will be called max1111.
config SENSORS_MAX1668
tristate "Maxim MAX1668 and compatibles"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for MAX1668, MAX1989 and
MAX1805 chips.
This driver can also be built as a module. If so, the module
will be called max1668.
+config SENSORS_MAX197
+ tristate "Maxim MAX197 and compatibles"
+ help
+ Support for the Maxim MAX197 A/D converter.
+ Support will include, but not be limited to, MAX197, and MAX199.
+
+ This driver can also be built as a module. If so, the module
+ will be called max197.
+
config SENSORS_MAX6639
tristate "Maxim MAX6639 sensor chip"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for the MAX6639
sensor chips.
config SENSORS_MAX6642
tristate "Maxim MAX6642 sensor chip"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for MAX6642 sensor chip.
MAX6642 is a SMBus-Compatible Remote/Local Temperature Sensor
config SENSORS_MAX6650
tristate "Maxim MAX6650 sensor chip"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for the MAX6650 / MAX6651
sensor chips.
will be called max6650.
config SENSORS_MCP3021
- tristate "Microchip MCP3021"
- depends on I2C && EXPERIMENTAL
+ tristate "Microchip MCP3021 and compatibles"
+ depends on I2C
help
- If you say yes here you get support for the MCP3021 chip
- that is a A/D converter (ADC) with 10-bit resolution.
+ If you say yes here you get support for MCP3021 and MCP3221.
+ The MCP3021 is a A/D converter (ADC) with 10-bit and the MCP3221
+ with 12-bit resolution.
This driver can also be built as a module. If so, the module
will be called mcp3021.
config SENSORS_NTC_THERMISTOR
tristate "NTC thermistor support"
- depends on EXPERIMENTAL
help
This driver supports NTC thermistors sensor reading and its
interpretation. The driver can also monitor the temperature and
config SENSORS_SMM665
tristate "Summit Microelectronics SMM665"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
default n
help
If you say yes here you get support for the hardware monitoring
config SENSORS_DME1737
tristate "SMSC DME1737, SCH311x and compatibles"
- depends on I2C && EXPERIMENTAL && !PPC
+ depends on I2C && !PPC
select HWMON_VID
help
If you say yes here you get support for the hardware monitoring
config SENSORS_SMSC47B397
tristate "SMSC LPC47B397-NC"
- depends on EXPERIMENTAL && !PPC
+ depends on !PPC
help
If you say yes here you get support for the SMSC LPC47B397-NC
sensor chip.
config SENSORS_AMC6821
tristate "Texas Instruments AMC6821"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for the Texas Instruments
AMC6821 hardware monitoring chips.
will be called amc6821.
config SENSORS_INA2XX
- tristate "Texas Instruments INA219, INA226"
- depends on I2C && EXPERIMENTAL
+ tristate "Texas Instruments INA219 and compatibles"
+ depends on I2C
help
- If you say yes here you get support for INA219 and INA226 power
- monitor chips.
+ If you say yes here you get support for INA219, INA220, INA226, and
+ INA230 power monitor chips.
The INA2xx driver is configured for the default configuration of
the part as described in the datasheet.
config SENSORS_TMP102
tristate "Texas Instruments TMP102"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for Texas Instruments TMP102
sensor chips.
config SENSORS_TMP401
tristate "Texas Instruments TMP401 and compatibles"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for Texas Instruments TMP401 and
TMP411 temperature sensor chips.
config SENSORS_TMP421
tristate "Texas Instruments TMP421 and compatible"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for Texas Instruments TMP421,
TMP422 and TMP423 temperature sensor chips.
config SENSORS_W83793
tristate "Winbond W83793"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
select HWMON_VID
help
If you say yes here you get support for the Winbond W83793
config SENSORS_W83795
tristate "Winbond/Nuvoton W83795G/ADG"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for the Winbond W83795G and
W83795ADG hardware monitoring chip, including manual fan speed
config SENSORS_W83795_FANCTRL
boolean "Include automatic fan control support (DANGEROUS)"
- depends on SENSORS_W83795 && EXPERIMENTAL
+ depends on SENSORS_W83795
default n
help
If you say yes here, support for automatic fan speed control
config SENSORS_W83L785TS
tristate "Winbond W83L785TS-S"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for the Winbond W83L785TS-S
sensor chip, which is used on the Asus A7N8X, among other
config SENSORS_W83L786NG
tristate "Winbond W83L786NG, W83L786NR"
- depends on I2C && EXPERIMENTAL
+ depends on I2C
help
If you say yes here you get support for the Winbond W83L786NG
and W83L786NR sensor chips.
config SENSORS_ATK0110
tristate "ASUS ATK0110"
- depends on X86 && EXPERIMENTAL
+ depends on X86
help
If you say yes here you get support for the ACPI hardware
monitoring interface found in many ASUS motherboards. This
obj-$(CONFIG_SENSORS_ADS1015) += ads1015.o
obj-$(CONFIG_SENSORS_ADS7828) += ads7828.o
obj-$(CONFIG_SENSORS_ADS7871) += ads7871.o
+obj-$(CONFIG_SENSORS_ADT7410) += adt7410.o
obj-$(CONFIG_SENSORS_ADT7411) += adt7411.o
obj-$(CONFIG_SENSORS_ADT7462) += adt7462.o
obj-$(CONFIG_SENSORS_ADT7470) += adt7470.o
obj-$(CONFIG_SENSORS_EMC1403) += emc1403.o
obj-$(CONFIG_SENSORS_EMC2103) += emc2103.o
obj-$(CONFIG_SENSORS_EMC6W201) += emc6w201.o
- obj-$(CONFIG_SENSORS_EXYNOS4_TMU) += exynos4_tmu.o
obj-$(CONFIG_SENSORS_F71805F) += f71805f.o
obj-$(CONFIG_SENSORS_F71882FG) += f71882fg.o
obj-$(CONFIG_SENSORS_F75375S) += f75375s.o
obj-$(CONFIG_SENSORS_MAX16065) += max16065.o
obj-$(CONFIG_SENSORS_MAX1619) += max1619.o
obj-$(CONFIG_SENSORS_MAX1668) += max1668.o
+obj-$(CONFIG_SENSORS_MAX197) += max197.o
obj-$(CONFIG_SENSORS_MAX6639) += max6639.o
obj-$(CONFIG_SENSORS_MAX6642) += max6642.o
obj-$(CONFIG_SENSORS_MAX6650) += max6650.o
unsigned long *temp)
{
struct omap_thermal_data *data = thermal->devdata;
- struct omap_bandgap *bg_ptr = data->bg_ptr;
- struct omap_temp_sensor *s = &bg_ptr->conf->sensors[data->sensor_id];
+ struct omap_bandgap *bg_ptr;
+ struct omap_temp_sensor *s;
int ret, tmp, pcb_temp, slope, constant;
+ if (!data)
+ return 0;
+
+ bg_ptr = data->bg_ptr;
+ s = &bg_ptr->conf->sensors[data->sensor_id];
+
ret = omap_bandgap_read_temperature(bg_ptr, data->sensor_id, &tmp);
if (ret)
return ret;
/* TODO: bind with min and max states */
/* Simple thing, two trips, one passive another critical */
- return thermal_zone_bind_cooling_device(thermal, 0, cdev);
+ return thermal_zone_bind_cooling_device(thermal, 0, cdev,
+ THERMAL_NO_LIMIT,
+ THERMAL_NO_LIMIT);
}
/* Unbind callback functions for thermal zone */
.get_crit_temp = omap_thermal_get_crit_temp,
};
-int omap_thermal_expose_sensor(struct omap_bandgap *bg_ptr, int id,
- char *domain)
+static struct omap_thermal_data
+*omap_thermal_build_data(struct omap_bandgap *bg_ptr, int id)
{
struct omap_thermal_data *data;
data = devm_kzalloc(bg_ptr->dev, sizeof(*data), GFP_KERNEL);
if (!data) {
dev_err(bg_ptr->dev, "kzalloc fail\n");
- return -ENOMEM;
+ return NULL;
}
data->sensor_id = id;
data->bg_ptr = bg_ptr;
data->mode = THERMAL_DEVICE_ENABLED;
INIT_WORK(&data->thermal_wq, omap_thermal_work);
+ return data;
+}
+
+int omap_thermal_expose_sensor(struct omap_bandgap *bg_ptr, int id,
+ char *domain)
+{
+ struct omap_thermal_pdata pdata;
+
+ data = omap_bandgap_get_sensor_data(bg_ptr, id);
+
+ if (!data)
+ data = omap_thermal_build_pdata(bg_ptr, id);
+
+ if (!data)
+ return -EINVAL;
+
/* TODO: remove TC1 TC2 */
/* Create thermal zone */
data->omap_thermal = thermal_zone_device_register(domain,
OMAP_TRIP_NUMBER, 0, data, &omap_thermal_ops,
- 1, 2, /*TODO: remove this when FW allows */
- 0, FAST_TEMP_MONITORING_RATE);
+ FAST_TEMP_MONITORING_RATE,
+ FAST_TEMP_MONITORING_RATE);
if (IS_ERR_OR_NULL(data->omap_thermal)) {
dev_err(bg_ptr->dev, "thermal zone device is NULL\n");
return PTR_ERR(data->omap_thermal);
int tab_size, ret;
data = omap_bandgap_get_sensor_data(bg_ptr, id);
+ if (!data)
+ data = omap_thermal_build_pdata(bg_ptr, id);
+
+ if (!data)
+ return -EINVAL;
ret = omap_thermal_build_cpufreq_clip(bg_ptr, &tab_ptr, &tab_size);
if (ret < 0) {
return PTR_ERR(data->cool_dev);
}
bg_ptr->conf->sensors[id].cooling_data.freq_clip_count = tab_size;
+ omap_bandgap_set_sensor_data(bg_ptr, id, data);
return 0;
}
--- /dev/null
- *id = *id & MAX_ID_MASK;
+ /*
+ * linux/drivers/thermal/cpu_cooling.c
+ *
+ * Copyright (C) 2012 Samsung Electronics Co., Ltd(http://www.samsung.com)
+ * Copyright (C) 2012 Amit Daniel <amit.kachhap@linaro.org>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * 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; version 2 of the License.
+ *
+ * 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.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+ #include <linux/kernel.h>
+ #include <linux/module.h>
+ #include <linux/thermal.h>
+ #include <linux/platform_device.h>
+ #include <linux/cpufreq.h>
+ #include <linux/err.h>
+ #include <linux/slab.h>
+ #include <linux/cpu.h>
+ #include <linux/cpu_cooling.h>
+
+ /**
+ * struct cpufreq_cooling_device
+ * @id: unique integer value corresponding to each cpufreq_cooling_device
+ * registered.
+ * @cool_dev: thermal_cooling_device pointer to keep track of the the
+ * egistered cooling device.
+ * @cpufreq_state: integer value representing the current state of cpufreq
+ * cooling devices.
+ * @cpufreq_val: integer value representing the absolute value of the clipped
+ * frequency.
+ * @allowed_cpus: all the cpus involved for this cpufreq_cooling_device.
+ * @node: list_head to link all cpufreq_cooling_device together.
+ *
+ * This structure is required for keeping information of each
+ * cpufreq_cooling_device registered as a list whose head is represented by
+ * cooling_cpufreq_list. In order to prevent corruption of this list a
+ * mutex lock cooling_cpufreq_lock is used.
+ */
+ struct cpufreq_cooling_device {
+ int id;
+ struct thermal_cooling_device *cool_dev;
+ unsigned int cpufreq_state;
+ unsigned int cpufreq_val;
+ struct cpumask allowed_cpus;
+ struct list_head node;
+ };
+ static LIST_HEAD(cooling_cpufreq_list);
+ static DEFINE_IDR(cpufreq_idr);
+
+ static struct mutex cooling_cpufreq_lock;
+
+ /* notify_table passes value to the CPUFREQ_ADJUST callback function. */
+ #define NOTIFY_INVALID NULL
+ struct cpufreq_cooling_device *notify_device;
+
+ /**
+ * get_idr - function to get a unique id.
+ * @idr: struct idr * handle used to create a id.
+ * @id: int * value generated by this function.
+ */
+ static int get_idr(struct idr *idr, int *id)
+ {
+ int err;
+ again:
+ if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
+ return -ENOMEM;
+
+ mutex_lock(&cooling_cpufreq_lock);
+ err = idr_get_new(idr, NULL, id);
+ mutex_unlock(&cooling_cpufreq_lock);
+
+ if (unlikely(err == -EAGAIN))
+ goto again;
+ else if (unlikely(err))
+ return err;
+
++ *id = *id & MAX_IDR_MASK;
+ return 0;
+ }
+
+ /**
+ * release_idr - function to free the unique id.
+ * @idr: struct idr * handle used for creating the id.
+ * @id: int value representing the unique id.
+ */
+ static void release_idr(struct idr *idr, int id)
+ {
+ mutex_lock(&cooling_cpufreq_lock);
+ idr_remove(idr, id);
+ mutex_unlock(&cooling_cpufreq_lock);
+ }
+
+ /* Below code defines functions to be used for cpufreq as cooling device */
+
+ /**
+ * is_cpufreq_valid - function to check if a cpu has frequency transition policy.
+ * @cpu: cpu for which check is needed.
+ */
+ static int is_cpufreq_valid(int cpu)
+ {
+ struct cpufreq_policy policy;
+ return !cpufreq_get_policy(&policy, cpu);
+ }
+
+ /**
+ * get_cpu_frequency - get the absolute value of frequency from level.
+ * @cpu: cpu for which frequency is fetched.
+ * @level: level of frequency of the CPU
+ * e.g level=1 --> 1st MAX FREQ, LEVEL=2 ---> 2nd MAX FREQ, .... etc
+ */
+ static unsigned int get_cpu_frequency(unsigned int cpu, unsigned long level)
+ {
+ int ret = 0, i = 0;
+ unsigned long level_index;
+ bool descend = false;
+ struct cpufreq_frequency_table *table =
+ cpufreq_frequency_get_table(cpu);
+ if (!table)
+ return ret;
+
+ while (table[i].frequency != CPUFREQ_TABLE_END) {
+ if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
+ continue;
+
+ /*check if table in ascending or descending order*/
+ if ((table[i + 1].frequency != CPUFREQ_TABLE_END) &&
+ (table[i + 1].frequency < table[i].frequency)
+ && !descend) {
+ descend = true;
+ }
+
+ /*return if level matched and table in descending order*/
+ if (descend && i == level)
+ return table[i].frequency;
+ i++;
+ }
+ i--;
+
+ if (level > i || descend)
+ return ret;
+ level_index = i - level;
+
+ /*Scan the table in reverse order and match the level*/
+ while (i >= 0) {
+ if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
+ continue;
+ /*return if level matched*/
+ if (i == level_index)
+ return table[i].frequency;
+ i--;
+ }
+ return ret;
+ }
+
+ /**
+ * cpufreq_apply_cooling - function to apply frequency clipping.
+ * @cpufreq_device: cpufreq_cooling_device pointer containing frequency
+ * clipping data.
+ * @cooling_state: value of the cooling state.
+ */
+ static int cpufreq_apply_cooling(struct cpufreq_cooling_device *cpufreq_device,
+ unsigned long cooling_state)
+ {
+ unsigned int cpuid, clip_freq;
+ struct cpumask *maskPtr = &cpufreq_device->allowed_cpus;
+ unsigned int cpu = cpumask_any(maskPtr);
+
+
+ /* Check if the old cooling action is same as new cooling action */
+ if (cpufreq_device->cpufreq_state == cooling_state)
+ return 0;
+
+ clip_freq = get_cpu_frequency(cpu, cooling_state);
+ if (!clip_freq)
+ return -EINVAL;
+
+ cpufreq_device->cpufreq_state = cooling_state;
+ cpufreq_device->cpufreq_val = clip_freq;
+ notify_device = cpufreq_device;
+
+ for_each_cpu(cpuid, maskPtr) {
+ if (is_cpufreq_valid(cpuid))
+ cpufreq_update_policy(cpuid);
+ }
+
+ notify_device = NOTIFY_INVALID;
+
+ return 0;
+ }
+
+ /**
+ * cpufreq_thermal_notifier - notifier callback for cpufreq policy change.
+ * @nb: struct notifier_block * with callback info.
+ * @event: value showing cpufreq event for which this function invoked.
+ * @data: callback-specific data
+ */
+ static int cpufreq_thermal_notifier(struct notifier_block *nb,
+ unsigned long event, void *data)
+ {
+ struct cpufreq_policy *policy = data;
+ unsigned long max_freq = 0;
+
+ if (event != CPUFREQ_ADJUST || notify_device == NOTIFY_INVALID)
+ return 0;
+
+ if (cpumask_test_cpu(policy->cpu, ¬ify_device->allowed_cpus))
+ max_freq = notify_device->cpufreq_val;
+
+ /* Never exceed user_policy.max*/
+ if (max_freq > policy->user_policy.max)
+ max_freq = policy->user_policy.max;
+
+ if (policy->max != max_freq)
+ cpufreq_verify_within_limits(policy, 0, max_freq);
+
+ return 0;
+ }
+
+ /*
+ * cpufreq cooling device callback functions are defined below
+ */
+
+ /**
+ * cpufreq_get_max_state - callback function to get the max cooling state.
+ * @cdev: thermal cooling device pointer.
+ * @state: fill this variable with the max cooling state.
+ */
+ static int cpufreq_get_max_state(struct thermal_cooling_device *cdev,
+ unsigned long *state)
+ {
+ int ret = -EINVAL, i = 0;
+ struct cpufreq_cooling_device *cpufreq_device;
+ struct cpumask *maskPtr;
+ unsigned int cpu;
+ struct cpufreq_frequency_table *table;
+
+ mutex_lock(&cooling_cpufreq_lock);
+ list_for_each_entry(cpufreq_device, &cooling_cpufreq_list, node) {
+ if (cpufreq_device && cpufreq_device->cool_dev == cdev)
+ break;
+ }
+ if (cpufreq_device == NULL)
+ goto return_get_max_state;
+
+ maskPtr = &cpufreq_device->allowed_cpus;
+ cpu = cpumask_any(maskPtr);
+ table = cpufreq_frequency_get_table(cpu);
+ if (!table) {
+ *state = 0;
+ ret = 0;
+ goto return_get_max_state;
+ }
+
+ while (table[i].frequency != CPUFREQ_TABLE_END) {
+ if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
+ continue;
+ i++;
+ }
+ if (i > 0) {
+ *state = --i;
+ ret = 0;
+ }
+
+ return_get_max_state:
+ mutex_unlock(&cooling_cpufreq_lock);
+ return ret;
+ }
+
+ /**
+ * cpufreq_get_cur_state - callback function to get the current cooling state.
+ * @cdev: thermal cooling device pointer.
+ * @state: fill this variable with the current cooling state.
+ */
+ static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long *state)
+ {
+ int ret = -EINVAL;
+ struct cpufreq_cooling_device *cpufreq_device;
+
+ mutex_lock(&cooling_cpufreq_lock);
+ list_for_each_entry(cpufreq_device, &cooling_cpufreq_list, node) {
+ if (cpufreq_device && cpufreq_device->cool_dev == cdev) {
+ *state = cpufreq_device->cpufreq_state;
+ ret = 0;
+ break;
+ }
+ }
+ mutex_unlock(&cooling_cpufreq_lock);
+
+ return ret;
+ }
+
+ /**
+ * cpufreq_set_cur_state - callback function to set the current cooling state.
+ * @cdev: thermal cooling device pointer.
+ * @state: set this variable to the current cooling state.
+ */
+ static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long state)
+ {
+ int ret = -EINVAL;
+ struct cpufreq_cooling_device *cpufreq_device;
+
+ mutex_lock(&cooling_cpufreq_lock);
+ list_for_each_entry(cpufreq_device, &cooling_cpufreq_list, node) {
+ if (cpufreq_device && cpufreq_device->cool_dev == cdev) {
+ ret = 0;
+ break;
+ }
+ }
+ if (!ret)
+ ret = cpufreq_apply_cooling(cpufreq_device, state);
+
+ mutex_unlock(&cooling_cpufreq_lock);
+
+ return ret;
+ }
+
+ /* Bind cpufreq callbacks to thermal cooling device ops */
+ static struct thermal_cooling_device_ops const cpufreq_cooling_ops = {
+ .get_max_state = cpufreq_get_max_state,
+ .get_cur_state = cpufreq_get_cur_state,
+ .set_cur_state = cpufreq_set_cur_state,
+ };
+
+ /* Notifier for cpufreq policy change */
+ static struct notifier_block thermal_cpufreq_notifier_block = {
+ .notifier_call = cpufreq_thermal_notifier,
+ };
+
+ /**
+ * cpufreq_cooling_register - function to create cpufreq cooling device.
+ * @clip_cpus: cpumask of cpus where the frequency constraints will happen.
+ */
+ struct thermal_cooling_device *cpufreq_cooling_register(
+ struct cpumask *clip_cpus)
+ {
+ struct thermal_cooling_device *cool_dev;
+ struct cpufreq_cooling_device *cpufreq_dev = NULL;
+ unsigned int cpufreq_dev_count = 0, min = 0, max = 0;
+ char dev_name[THERMAL_NAME_LENGTH];
+ int ret = 0, i;
+ struct cpufreq_policy policy;
+
+ list_for_each_entry(cpufreq_dev, &cooling_cpufreq_list, node)
+ cpufreq_dev_count++;
+
+ /*Verify that all the clip cpus have same freq_min, freq_max limit*/
+ for_each_cpu(i, clip_cpus) {
+ /*continue if cpufreq policy not found and not return error*/
+ if (!cpufreq_get_policy(&policy, i))
+ continue;
+ if (min == 0 && max == 0) {
+ min = policy.cpuinfo.min_freq;
+ max = policy.cpuinfo.max_freq;
+ } else {
+ if (min != policy.cpuinfo.min_freq ||
+ max != policy.cpuinfo.max_freq)
+ return ERR_PTR(-EINVAL);
+ }
+ }
+ cpufreq_dev = kzalloc(sizeof(struct cpufreq_cooling_device),
+ GFP_KERNEL);
+ if (!cpufreq_dev)
+ return ERR_PTR(-ENOMEM);
+
+ cpumask_copy(&cpufreq_dev->allowed_cpus, clip_cpus);
+
+ if (cpufreq_dev_count == 0)
+ mutex_init(&cooling_cpufreq_lock);
+
+ ret = get_idr(&cpufreq_idr, &cpufreq_dev->id);
+ if (ret) {
+ kfree(cpufreq_dev);
+ return ERR_PTR(-EINVAL);
+ }
+
+ sprintf(dev_name, "thermal-cpufreq-%d", cpufreq_dev->id);
+
+ cool_dev = thermal_cooling_device_register(dev_name, cpufreq_dev,
+ &cpufreq_cooling_ops);
+ if (!cool_dev) {
+ release_idr(&cpufreq_idr, cpufreq_dev->id);
+ kfree(cpufreq_dev);
+ return ERR_PTR(-EINVAL);
+ }
+ cpufreq_dev->cool_dev = cool_dev;
+ cpufreq_dev->cpufreq_state = 0;
+ mutex_lock(&cooling_cpufreq_lock);
+ list_add_tail(&cpufreq_dev->node, &cooling_cpufreq_list);
+
+ /* Register the notifier for first cpufreq cooling device */
+ if (cpufreq_dev_count == 0)
+ cpufreq_register_notifier(&thermal_cpufreq_notifier_block,
+ CPUFREQ_POLICY_NOTIFIER);
+
+ mutex_unlock(&cooling_cpufreq_lock);
+ return cool_dev;
+ }
+ EXPORT_SYMBOL(cpufreq_cooling_register);
+
+ /**
+ * cpufreq_cooling_unregister - function to remove cpufreq cooling device.
+ * @cdev: thermal cooling device pointer.
+ */
+ void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
+ {
+ struct cpufreq_cooling_device *cpufreq_dev = NULL;
+ unsigned int cpufreq_dev_count = 0;
+
+ mutex_lock(&cooling_cpufreq_lock);
+ list_for_each_entry(cpufreq_dev, &cooling_cpufreq_list, node) {
+ if (cpufreq_dev && cpufreq_dev->cool_dev == cdev)
+ break;
+ cpufreq_dev_count++;
+ }
+
+ if (!cpufreq_dev || cpufreq_dev->cool_dev != cdev) {
+ mutex_unlock(&cooling_cpufreq_lock);
+ return;
+ }
+
+ list_del(&cpufreq_dev->node);
+
+ /* Unregister the notifier for the last cpufreq cooling device */
+ if (cpufreq_dev_count == 1) {
+ cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block,
+ CPUFREQ_POLICY_NOTIFIER);
+ }
+ mutex_unlock(&cooling_cpufreq_lock);
+ thermal_cooling_device_unregister(cpufreq_dev->cool_dev);
+ release_idr(&cpufreq_idr, cpufreq_dev->id);
+ if (cpufreq_dev_count == 1)
+ mutex_destroy(&cooling_cpufreq_lock);
+ kfree(cpufreq_dev);
+ }
+ EXPORT_SYMBOL(cpufreq_cooling_unregister);
MODULE_DESCRIPTION("Generic thermal management sysfs support");
MODULE_LICENSE("GPL");
- struct thermal_cooling_device_instance {
+ #define THERMAL_NO_TARGET -1UL
+ /*
+ * This structure is used to describe the behavior of
+ * a certain cooling device on a certain trip point
+ * in a certain thermal zone
+ */
+ struct thermal_instance {
int id;
char name[THERMAL_NAME_LENGTH];
struct thermal_zone_device *tz;
struct thermal_cooling_device *cdev;
int trip;
+ unsigned long upper; /* Highest cooling state for this trip point */
+ unsigned long lower; /* Lowest cooling state for this trip point */
+ unsigned long target; /* expected cooling state */
char attr_name[THERMAL_NAME_LENGTH];
struct device_attribute attr;
- struct list_head node;
+ struct list_head tz_node; /* node in tz->thermal_instances */
+ struct list_head cdev_node; /* node in cdev->thermal_instances */
};
static DEFINE_IDR(thermal_tz_idr);
else if (unlikely(err))
return err;
- *id = *id & MAX_ID_MASK;
+ *id = *id & MAX_IDR_MASK;
return 0;
}
if (!strncmp("Processor", cdev->type,
sizeof("Processor")))
thermal_zone_bind_cooling_device(tz,
- THERMAL_TRIPS_NONE,
- cdev);
+ THERMAL_TRIPS_NONE, cdev,
+ THERMAL_NO_LIMIT,
+ THERMAL_NO_LIMIT);
}
mutex_unlock(&thermal_list_lock);
if (!tz->passive_delay)
tz->passive_delay = 0;
}
- tz->tc1 = 1;
- tz->tc2 = 1;
-
tz->forced_passive = state;
thermal_zone_device_update(tz);
thermal_cooling_device_trip_point_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct thermal_cooling_device_instance *instance;
+ struct thermal_instance *instance;
instance =
- container_of(attr, struct thermal_cooling_device_instance, attr);
+ container_of(attr, struct thermal_instance, attr);
if (instance->trip == THERMAL_TRIPS_NONE)
return sprintf(buf, "-1\n");
temp->tz = tz;
hwmon->count++;
- snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
+ snprintf(temp->temp_input.name, sizeof(temp->temp_input.name),
"temp%d_input", hwmon->count);
temp->temp_input.attr.attr.name = temp->temp_input.name;
temp->temp_input.attr.attr.mode = 0444;
if (tz->ops->get_crit_temp) {
unsigned long temperature;
if (!tz->ops->get_crit_temp(tz, &temperature)) {
- snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
+ snprintf(temp->temp_crit.name,
+ sizeof(temp->temp_crit.name),
"temp%d_crit", hwmon->count);
temp->temp_crit.attr.attr.name = temp->temp_crit.name;
temp->temp_crit.attr.attr.mode = 0444;
static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
int delay)
{
- cancel_delayed_work(&(tz->poll_queue));
-
- if (!delay)
- return;
-
if (delay > 1000)
- queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
- round_jiffies(msecs_to_jiffies(delay)));
+ mod_delayed_work(system_freezable_wq, &tz->poll_queue,
+ round_jiffies(msecs_to_jiffies(delay)));
+ else if (delay)
+ mod_delayed_work(system_freezable_wq, &tz->poll_queue,
+ msecs_to_jiffies(delay));
else
- queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
- msecs_to_jiffies(delay));
+ cancel_delayed_work(&tz->poll_queue);
}
- static void thermal_zone_device_passive(struct thermal_zone_device *tz,
- int temp, int trip_temp, int trip)
- {
- int trend = 0;
- struct thermal_cooling_device_instance *instance;
- struct thermal_cooling_device *cdev;
- long state, max_state;
-
- /*
- * Above Trip?
- * -----------
- * Calculate the thermal trend (using the passive cooling equation)
- * and modify the performance limit for all passive cooling devices
- * accordingly. Note that we assume symmetry.
- */
- if (temp >= trip_temp) {
- tz->passive = true;
-
- trend = (tz->tc1 * (temp - tz->last_temperature)) +
- (tz->tc2 * (temp - trip_temp));
-
- /* Heating up? */
- if (trend > 0) {
- list_for_each_entry(instance, &tz->cooling_devices,
- node) {
- if (instance->trip != trip)
- continue;
- cdev = instance->cdev;
- cdev->ops->get_cur_state(cdev, &state);
- cdev->ops->get_max_state(cdev, &max_state);
- if (state++ < max_state)
- cdev->ops->set_cur_state(cdev, state);
- }
- } else if (trend < 0) { /* Cooling off? */
- list_for_each_entry(instance, &tz->cooling_devices,
- node) {
- if (instance->trip != trip)
- continue;
- cdev = instance->cdev;
- cdev->ops->get_cur_state(cdev, &state);
- cdev->ops->get_max_state(cdev, &max_state);
- if (state > 0)
- cdev->ops->set_cur_state(cdev, --state);
- }
- }
- return;
- }
-
- /*
- * Below Trip?
- * -----------
- * Implement passive cooling hysteresis to slowly increase performance
- * and avoid thrashing around the passive trip point. Note that we
- * assume symmetry.
- */
- list_for_each_entry(instance, &tz->cooling_devices, node) {
- if (instance->trip != trip)
- continue;
- cdev = instance->cdev;
- cdev->ops->get_cur_state(cdev, &state);
- cdev->ops->get_max_state(cdev, &max_state);
- if (state > 0)
- cdev->ops->set_cur_state(cdev, --state);
- if (state == 0)
- tz->passive = false;
- }
- }
-
static void thermal_zone_device_check(struct work_struct *work)
{
struct thermal_zone_device *tz = container_of(work, struct
*/
int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
int trip,
- struct thermal_cooling_device *cdev)
+ struct thermal_cooling_device *cdev,
+ unsigned long upper, unsigned long lower)
{
- struct thermal_cooling_device_instance *dev;
- struct thermal_cooling_device_instance *pos;
+ struct thermal_instance *dev;
+ struct thermal_instance *pos;
struct thermal_zone_device *pos1;
struct thermal_cooling_device *pos2;
+ unsigned long max_state;
int result;
if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
if (tz != pos1 || cdev != pos2)
return -EINVAL;
+ cdev->ops->get_max_state(cdev, &max_state);
+
+ /* lower default 0, upper default max_state */
+ lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
+ upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
+
+ if (lower > upper || upper > max_state)
+ return -EINVAL;
+
dev =
- kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
+ kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
if (!dev)
return -ENOMEM;
dev->tz = tz;
dev->cdev = cdev;
dev->trip = trip;
+ dev->upper = upper;
+ dev->lower = lower;
+ dev->target = THERMAL_NO_TARGET;
+
result = get_idr(&tz->idr, &tz->lock, &dev->id);
if (result)
goto free_mem;
goto remove_symbol_link;
mutex_lock(&tz->lock);
- list_for_each_entry(pos, &tz->cooling_devices, node)
+ mutex_lock(&cdev->lock);
+ list_for_each_entry(pos, &tz->thermal_instances, tz_node)
if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
result = -EEXIST;
break;
}
- if (!result)
- list_add_tail(&dev->node, &tz->cooling_devices);
+ if (!result) {
+ list_add_tail(&dev->tz_node, &tz->thermal_instances);
+ list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
+ }
+ mutex_unlock(&cdev->lock);
mutex_unlock(&tz->lock);
if (!result)
int trip,
struct thermal_cooling_device *cdev)
{
- struct thermal_cooling_device_instance *pos, *next;
+ struct thermal_instance *pos, *next;
mutex_lock(&tz->lock);
- list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
+ mutex_lock(&cdev->lock);
+ list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
- list_del(&pos->node);
+ list_del(&pos->tz_node);
+ list_del(&pos->cdev_node);
+ mutex_unlock(&cdev->lock);
mutex_unlock(&tz->lock);
goto unbind;
}
}
+ mutex_unlock(&cdev->lock);
mutex_unlock(&tz->lock);
return -ENODEV;
struct thermal_zone_device *pos;
int result;
- if (strlen(type) >= THERMAL_NAME_LENGTH)
+ if (type && strlen(type) >= THERMAL_NAME_LENGTH)
return ERR_PTR(-EINVAL);
if (!ops || !ops->get_max_state || !ops->get_cur_state ||
return ERR_PTR(result);
}
- strcpy(cdev->type, type);
+ strcpy(cdev->type, type ? : "");
+ mutex_init(&cdev->lock);
+ INIT_LIST_HEAD(&cdev->thermal_instances);
cdev->ops = ops;
+ cdev->updated = true;
cdev->device.class = &thermal_class;
cdev->devdata = devdata;
dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
}
EXPORT_SYMBOL(thermal_cooling_device_unregister);
+ static void thermal_cdev_do_update(struct thermal_cooling_device *cdev)
+ {
+ struct thermal_instance *instance;
+ unsigned long target = 0;
+
+ /* cooling device is updated*/
+ if (cdev->updated)
+ return;
+
+ mutex_lock(&cdev->lock);
+ /* Make sure cdev enters the deepest cooling state */
+ list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
+ if (instance->target == THERMAL_NO_TARGET)
+ continue;
+ if (instance->target > target)
+ target = instance->target;
+ }
+ mutex_unlock(&cdev->lock);
+ cdev->ops->set_cur_state(cdev, target);
+ cdev->updated = true;
+ }
+
+ static void thermal_zone_do_update(struct thermal_zone_device *tz)
+ {
+ struct thermal_instance *instance;
+
+ list_for_each_entry(instance, &tz->thermal_instances, tz_node)
+ thermal_cdev_do_update(instance->cdev);
+ }
+
+ /*
+ * Cooling algorithm for both active and passive cooling
+ *
+ * 1. if the temperature is higher than a trip point,
+ * a. if the trend is THERMAL_TREND_RAISING, use higher cooling
+ * state for this trip point
+ * b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
+ * state for this trip point
+ *
+ * 2. if the temperature is lower than a trip point, use lower
+ * cooling state for this trip point
+ *
+ * Note that this behaves the same as the previous passive cooling
+ * algorithm.
+ */
+
+ static void thermal_zone_trip_update(struct thermal_zone_device *tz,
+ int trip, long temp)
+ {
+ struct thermal_instance *instance;
+ struct thermal_cooling_device *cdev = NULL;
+ unsigned long cur_state, max_state;
+ long trip_temp;
+ enum thermal_trip_type trip_type;
+ enum thermal_trend trend;
+
+ if (trip == THERMAL_TRIPS_NONE) {
+ trip_temp = tz->forced_passive;
+ trip_type = THERMAL_TRIPS_NONE;
+ } else {
+ tz->ops->get_trip_temp(tz, trip, &trip_temp);
+ tz->ops->get_trip_type(tz, trip, &trip_type);
+ }
+
+ if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
+ /*
+ * compare the current temperature and previous temperature
+ * to get the thermal trend, if no special requirement
+ */
+ if (tz->temperature > tz->last_temperature)
+ trend = THERMAL_TREND_RAISING;
+ else if (tz->temperature < tz->last_temperature)
+ trend = THERMAL_TREND_DROPPING;
+ else
+ trend = THERMAL_TREND_STABLE;
+ }
+
+ if (temp >= trip_temp) {
+ list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
+ if (instance->trip != trip)
+ continue;
+
+ cdev = instance->cdev;
+
+ cdev->ops->get_cur_state(cdev, &cur_state);
+ cdev->ops->get_max_state(cdev, &max_state);
+
+ if (trend == THERMAL_TREND_RAISING) {
+ cur_state = cur_state < instance->upper ?
+ (cur_state + 1) : instance->upper;
+ } else if (trend == THERMAL_TREND_DROPPING) {
+ cur_state = cur_state > instance->lower ?
+ (cur_state - 1) : instance->lower;
+ }
+
+ /* activate a passive thermal instance */
+ if ((trip_type == THERMAL_TRIP_PASSIVE ||
+ trip_type == THERMAL_TRIPS_NONE) &&
+ instance->target == THERMAL_NO_TARGET)
+ tz->passive++;
+
+ instance->target = cur_state;
+ cdev->updated = false; /* cooling device needs update */
+ }
+ } else { /* below trip */
+ list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
+ if (instance->trip != trip)
+ continue;
+
+ /* Do not use the inactive thermal instance */
+ if (instance->target == THERMAL_NO_TARGET)
+ continue;
+ cdev = instance->cdev;
+ cdev->ops->get_cur_state(cdev, &cur_state);
+
+ cur_state = cur_state > instance->lower ?
+ (cur_state - 1) : THERMAL_NO_TARGET;
+
+ /* deactivate a passive thermal instance */
+ if ((trip_type == THERMAL_TRIP_PASSIVE ||
+ trip_type == THERMAL_TRIPS_NONE) &&
+ cur_state == THERMAL_NO_TARGET)
+ tz->passive--;
+ instance->target = cur_state;
+ cdev->updated = false; /* cooling device needs update */
+ }
+ }
+
+ return;
+ }
/**
* thermal_zone_device_update - force an update of a thermal zone's state
* @ttz: the thermal zone to update
int count, ret = 0;
long temp, trip_temp;
enum thermal_trip_type trip_type;
- struct thermal_cooling_device_instance *instance;
- struct thermal_cooling_device *cdev;
mutex_lock(&tz->lock);
goto leave;
}
+ tz->last_temperature = tz->temperature;
+ tz->temperature = temp;
+
for (count = 0; count < tz->trips; count++) {
tz->ops->get_trip_type(tz, count, &trip_type);
tz->ops->get_trip_temp(tz, count, &trip_temp);
tz->ops->notify(tz, count, trip_type);
break;
case THERMAL_TRIP_ACTIVE:
- list_for_each_entry(instance, &tz->cooling_devices,
- node) {
- if (instance->trip != count)
- continue;
-
- cdev = instance->cdev;
-
- if (temp >= trip_temp)
- cdev->ops->set_cur_state(cdev, 1);
- else
- cdev->ops->set_cur_state(cdev, 0);
- }
+ thermal_zone_trip_update(tz, count, temp);
break;
case THERMAL_TRIP_PASSIVE:
if (temp >= trip_temp || tz->passive)
- thermal_zone_device_passive(tz, temp,
- trip_temp, count);
+ thermal_zone_trip_update(tz, count, temp);
break;
}
}
if (tz->forced_passive)
- thermal_zone_device_passive(tz, temp, tz->forced_passive,
- THERMAL_TRIPS_NONE);
-
- tz->last_temperature = temp;
+ thermal_zone_trip_update(tz, THERMAL_TRIPS_NONE, temp);
+ thermal_zone_do_update(tz);
leave:
if (tz->passive)
* @mask: a bit string indicating the writeablility of trip points
* @devdata: private device data
* @ops: standard thermal zone device callbacks
- * @tc1: thermal coefficient 1 for passive calculations
- * @tc2: thermal coefficient 2 for passive calculations
* @passive_delay: number of milliseconds to wait between polls when
* performing passive cooling
* @polling_delay: number of milliseconds to wait between polls when checking
* driven systems)
*
* thermal_zone_device_unregister() must be called when the device is no
- * longer needed. The passive cooling formula uses tc1 and tc2 as described in
- * section 11.1.5.1 of the ACPI specification 3.0.
+ * longer needed. The passive cooling depends on the .get_trend() return value.
*/
struct thermal_zone_device *thermal_zone_device_register(const char *type,
int trips, int mask, void *devdata,
const struct thermal_zone_device_ops *ops,
- int tc1, int tc2, int passive_delay, int polling_delay)
+ int passive_delay, int polling_delay)
{
struct thermal_zone_device *tz;
struct thermal_cooling_device *pos;
int count;
int passive = 0;
- if (strlen(type) >= THERMAL_NAME_LENGTH)
+ if (type && strlen(type) >= THERMAL_NAME_LENGTH)
return ERR_PTR(-EINVAL);
if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
if (!tz)
return ERR_PTR(-ENOMEM);
- INIT_LIST_HEAD(&tz->cooling_devices);
+ INIT_LIST_HEAD(&tz->thermal_instances);
idr_init(&tz->idr);
mutex_init(&tz->lock);
result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
return ERR_PTR(result);
}
- strcpy(tz->type, type);
+ strcpy(tz->type, type ? : "");
tz->ops = ops;
tz->device.class = &thermal_class;
tz->devdata = devdata;
tz->trips = trips;
- tz->tc1 = tc1;
- tz->tc2 = tc2;
tz->passive_delay = passive_delay;
tz->polling_delay = polling_delay;
projects / ~andy / linux / commitdiff