Newer laptops and tablets may have thermal sensors outside the core cpu/SOC. These temperature sensors are exposed to OS via ACPI using INT3403 objects. This driver registers each INT3403 thermal sensor as a thermal zone device, and exposes its _TMP, PATx and GTSH method via the standard thermal control interface under /sys/class/thermal/.
Signed-off-by: Srinivas Pandruvada <[email protected]> --- drivers/thermal/Kconfig | 15 +++ drivers/thermal/Makefile | 1 + drivers/thermal/int3403_thermal.c | 237 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 253 insertions(+) create mode 100644 drivers/thermal/int3403_thermal.c diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index f35a1f7..a99e6f9 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -192,6 +192,21 @@ config X86_PKG_TEMP_THERMAL two trip points which can be set by user to get notifications via thermal notification methods. +config ACPI_INT3403_THERMAL + tristate "ACPI INT3403 thermal driver" + depends on X86 && ACPI + help + Newer laptops and tablets that use ACPI may have thermal sensors + outside the core CPU/SOC for thermal safety reasons. These + temperature sensors are also exposed for the OS to use via the so + called INT3403 ACPI object. This driver will, on devices that have + such sensors, expose the temperature information from these sensors + to userspace via the normal thermal framework. This means that a wide + range of applications and GUI widgets can show this information to + the user or use this information for making decisions. For example, + the Intel Thermal Daemon can use this information to allow the user + to select his laptop to run without turning on the fans. + menu "Texas Instruments thermal drivers" source "drivers/thermal/ti-soc-thermal/Kconfig" endmenu diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 584b363..aa1bba9 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -29,3 +29,4 @@ obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o obj-$(CONFIG_X86_PKG_TEMP_THERMAL) += x86_pkg_temp_thermal.o obj-$(CONFIG_TI_SOC_THERMAL) += ti-soc-thermal/ +obj-$(CONFIG_ACPI_INT3403_THERMAL) += int3403_thermal.o diff --git a/drivers/thermal/int3403_thermal.c b/drivers/thermal/int3403_thermal.c new file mode 100644 index 0000000..1301681 --- /dev/null +++ b/drivers/thermal/int3403_thermal.c @@ -0,0 +1,237 @@ +/* + * ACPI INT3403 thermal driver + * Copyright (c) 2013, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/acpi.h> +#include <linux/thermal.h> + +#define INT3403_TYPE_SENSOR 0x03 +#define INT3403_PERF_CHANGED_EVENT 0x80 +#define INT3403_THERMAL_EVENT 0x90 + +#define DECI_KELVIN_TO_MILLI_CELSIUS(t, off) (((t) - (off)) * 100) +#define KELVIN_OFFSET 2732 +#define MILLI_CELSIUS_TO_DECI_KELVIN(t, off) (((t) / 100) + (off)) + +#define ACPI_INT3403_CLASS "int3403" +#define ACPI_INT3403_FILE_STATE "state" + +struct int3403_sensor { + struct thermal_zone_device *tzone; + unsigned long *thresholds; +}; + +static int sys_get_curr_temp(struct thermal_zone_device *tzone, + unsigned long *temp) +{ + struct acpi_device *device = tzone->devdata; + unsigned long long tmp; + acpi_status status; + + status = acpi_evaluate_integer(device->handle, "_TMP", NULL, &tmp); + if (ACPI_FAILURE(status)) + return -EIO; + + *temp = DECI_KELVIN_TO_MILLI_CELSIUS(tmp, KELVIN_OFFSET); + + return 0; +} + +static int sys_get_trip_hyst(struct thermal_zone_device *tzone, + int trip, unsigned long *temp) +{ + struct acpi_device *device = tzone->devdata; + unsigned long long hyst; + acpi_status status; + + status = acpi_evaluate_integer(device->handle, "GTSH", NULL, &hyst); + if (ACPI_FAILURE(status)) + return -EIO; + + *temp = DECI_KELVIN_TO_MILLI_CELSIUS(hyst, KELVIN_OFFSET); + + return 0; +} + +static int sys_get_trip_temp(struct thermal_zone_device *tzone, + int trip, unsigned long *temp) +{ + struct acpi_device *device = tzone->devdata; + struct int3403_sensor *obj = acpi_driver_data(device); + + /* + * get_trip_temp is a mandatory callback but + * PATx method doesn't return any value, so return + * cached value, which was last set from user space. + */ + *temp = obj->thresholds[trip]; + + return 0; +} + +static int sys_get_trip_type(struct thermal_zone_device *thermal, + int trip, enum thermal_trip_type *type) +{ + /* Mandatory callback, may not mean much here */ + *type = THERMAL_TRIP_PASSIVE; + + return 0; +} + +int sys_set_trip_temp(struct thermal_zone_device *tzone, int trip, + unsigned long temp) +{ + struct acpi_device *device = tzone->devdata; + acpi_status status; + char name[10]; + int ret = 0; + struct int3403_sensor *obj = acpi_driver_data(device); + + snprintf(name, sizeof(name), "PAT%d", trip); + if (acpi_has_method(device->handle, name)) { + status = acpi_execute_simple_method(device->handle, name, + MILLI_CELSIUS_TO_DECI_KELVIN(temp, + KELVIN_OFFSET)); + if (ACPI_FAILURE(status)) + ret = -EIO; + else + obj->thresholds[trip] = temp; + } else { + ret = -EIO; + dev_err(&device->dev, "sys_set_trip_temp: method not found\n"); + } + + return ret; +} + +static struct thermal_zone_device_ops tzone_ops = { + .get_temp = sys_get_curr_temp, + .get_trip_temp = sys_get_trip_temp, + .get_trip_type = sys_get_trip_type, + .set_trip_temp = sys_set_trip_temp, + .get_trip_hyst = sys_get_trip_hyst, +}; + +static void acpi_thermal_notify(struct acpi_device *device, u32 event) +{ + struct int3403_sensor *obj; + + if (!device) + return; + + obj = acpi_driver_data(device); + if (!obj) + return; + + switch (event) { + case INT3403_PERF_CHANGED_EVENT: + break; + case INT3403_THERMAL_EVENT: + thermal_zone_device_update(obj->tzone); + break; + default: + dev_err(&device->dev, "Unsupported event [0x%x]\n", event); + break; + } +} + +static int acpi_int3403_add(struct acpi_device *device) +{ + int result = 0; + unsigned long long ptyp; + acpi_status status; + struct int3403_sensor *obj; + unsigned long long trip_cnt; + int trip_mask = 0; + + if (!device) + return -EINVAL; + + status = acpi_evaluate_integer(device->handle, "PTYP", NULL, &ptyp); + if (ACPI_FAILURE(status)) + return -EINVAL; + + if (ptyp != INT3403_TYPE_SENSOR) + return -EINVAL; + + obj = devm_kzalloc(&device->dev, sizeof(*obj), GFP_KERNEL); + if (!obj) + return -ENOMEM; + + device->driver_data = obj; + + status = acpi_evaluate_integer(device->handle, "PATC", NULL, + &trip_cnt); + if (ACPI_FAILURE(status)) + trip_cnt = 0; + + if (trip_cnt) { + /* We have to cache, thresholds can't be readback */ + obj->thresholds = devm_kzalloc(&device->dev, + sizeof(*obj->thresholds) * trip_cnt, + GFP_KERNEL); + if (!obj->thresholds) + return -ENOMEM; + trip_mask = BIT(trip_cnt) - 1; + } + obj->tzone = thermal_zone_device_register(acpi_device_bid(device), + trip_cnt, trip_mask, device, &tzone_ops, + NULL, 0, 0); + if (IS_ERR(obj->tzone)) { + result = PTR_ERR(obj->tzone); + return result; + } + + strcpy(acpi_device_name(device), "INT3403"); + strcpy(acpi_device_class(device), ACPI_INT3403_CLASS); + + return 0; +} + +static int acpi_int3403_remove(struct acpi_device *device) +{ + struct int3403_sensor *obj; + + obj = acpi_driver_data(device); + thermal_zone_device_unregister(obj->tzone); + + return 0; +} + +ACPI_MODULE_NAME("int3403"); +static const struct acpi_device_id int3403_device_ids[] = { + {"INT3403", 0}, + {"", 0}, +}; +MODULE_DEVICE_TABLE(acpi, int3403_device_ids); + +static struct acpi_driver acpi_int3403_driver = { + .name = "INT3403", + .class = ACPI_INT3403_CLASS, + .ids = int3403_device_ids, + .ops = { + .add = acpi_int3403_add, + .remove = acpi_int3403_remove, + .notify = acpi_thermal_notify, + }, +}; + +module_acpi_driver(acpi_int3403_driver); + +MODULE_AUTHOR("Srinivas Pandruvada <[email protected]>"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("ACPI INT3403 thermal driver"); -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
