diff options
Diffstat (limited to 'drivers/thermal/int340x_thermal')
| -rw-r--r-- | drivers/thermal/int340x_thermal/Kconfig | 42 | ||||
| -rw-r--r-- | drivers/thermal/int340x_thermal/Makefile | 1 | ||||
| -rw-r--r-- | drivers/thermal/int340x_thermal/int3406_thermal.c | 236 |
3 files changed, 279 insertions, 0 deletions
diff --git a/drivers/thermal/int340x_thermal/Kconfig b/drivers/thermal/int340x_thermal/Kconfig new file mode 100644 index 000000000000..0582bd12a239 --- /dev/null +++ b/drivers/thermal/int340x_thermal/Kconfig @@ -0,0 +1,42 @@ +# +# ACPI INT340x thermal drivers configuration +# + +config INT340X_THERMAL + tristate "ACPI INT340X thermal drivers" + depends on X86 && ACPI + select THERMAL_GOV_USER_SPACE + select ACPI_THERMAL_REL + select ACPI_FAN + select INTEL_SOC_DTS_IOSF_CORE + help + Newer laptops and tablets that use ACPI may have thermal sensors and + other devices with thermal control capabilities outside the core + CPU/SOC, for thermal safety reasons. + They are exposed for the OS to use via the INT3400 ACPI device object + as the master, and INT3401~INT340B ACPI device objects as the slaves. + Enable this to expose the temperature information and cooling ability + from these objects to userspace via the normal thermal framework. + This means that a wide range of applications and GUI widgets can show + the 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. + +config ACPI_THERMAL_REL + tristate + depends on ACPI + +if INT340X_THERMAL + +config INT3406_THERMAL + tristate "ACPI INT3406 display thermal driver" + depends on ACPI_VIDEO + help + The display thermal device represents the LED/LCD display panel + that may or may not include touch support. The main function of + the display thermal device is to allow control of the display + brightness in order to address a thermal condition or to reduce + power consumed by display device. + +endif diff --git a/drivers/thermal/int340x_thermal/Makefile b/drivers/thermal/int340x_thermal/Makefile index ba77a34f659f..df0df055e7ff 100644 --- a/drivers/thermal/int340x_thermal/Makefile +++ b/drivers/thermal/int340x_thermal/Makefile @@ -3,4 +3,5 @@ obj-$(CONFIG_INT340X_THERMAL) += int340x_thermal_zone.o obj-$(CONFIG_INT340X_THERMAL) += int3402_thermal.o obj-$(CONFIG_INT340X_THERMAL) += int3403_thermal.o obj-$(CONFIG_INT340X_THERMAL) += processor_thermal_device.o +obj-$(CONFIG_INT3406_THERMAL) += int3406_thermal.o obj-$(CONFIG_ACPI_THERMAL_REL) += acpi_thermal_rel.o diff --git a/drivers/thermal/int340x_thermal/int3406_thermal.c b/drivers/thermal/int340x_thermal/int3406_thermal.c new file mode 100644 index 000000000000..13d431cbd29e --- /dev/null +++ b/drivers/thermal/int340x_thermal/int3406_thermal.c @@ -0,0 +1,236 @@ +/* + * INT3406 thermal driver for display participant device + * + * Copyright (C) 2016, Intel Corporation + * Authors: Aaron Lu <aaron.lu@intel.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/acpi.h> +#include <linux/backlight.h> +#include <linux/thermal.h> +#include <acpi/video.h> + +#define INT3406_BRIGHTNESS_LIMITS_CHANGED 0x80 + +struct int3406_thermal_data { + int upper_limit; + int upper_limit_index; + int lower_limit; + int lower_limit_index; + acpi_handle handle; + struct acpi_video_device_brightness *br; + struct backlight_device *raw_bd; + struct thermal_cooling_device *cooling_dev; +}; + +static int int3406_thermal_to_raw(int level, struct int3406_thermal_data *d) +{ + int max_level = d->br->levels[d->br->count - 1]; + int raw_max = d->raw_bd->props.max_brightness; + + return level * raw_max / max_level; +} + +static int int3406_thermal_to_acpi(int level, struct int3406_thermal_data *d) +{ + int raw_max = d->raw_bd->props.max_brightness; + int max_level = d->br->levels[d->br->count - 1]; + + return level * max_level / raw_max; +} + +static int +int3406_thermal_get_max_state(struct thermal_cooling_device *cooling_dev, + unsigned long *state) +{ + struct int3406_thermal_data *d = cooling_dev->devdata; + int index = d->lower_limit_index ? d->lower_limit_index : 2; + + *state = d->br->count - 1 - index; + return 0; +} + +static int +int3406_thermal_set_cur_state(struct thermal_cooling_device *cooling_dev, + unsigned long state) +{ + struct int3406_thermal_data *d = cooling_dev->devdata; + int level, raw_level; + + if (state > d->br->count - 3) + return -EINVAL; + + state = d->br->count - 1 - state; + level = d->br->levels[state]; + + if ((d->upper_limit && level > d->upper_limit) || + (d->lower_limit && level < d->lower_limit)) + return -EINVAL; + + raw_level = int3406_thermal_to_raw(level, d); + return backlight_device_set_brightness(d->raw_bd, raw_level); +} + +static int +int3406_thermal_get_cur_state(struct thermal_cooling_device *cooling_dev, + unsigned long *state) +{ + struct int3406_thermal_data *d = cooling_dev->devdata; + int raw_level, level, i; + int *levels = d->br->levels; + + raw_level = d->raw_bd->props.brightness; + level = int3406_thermal_to_acpi(raw_level, d); + + /* + * There is no 1:1 mapping between the firmware interface level with the + * raw interface level, we will have to find one that is close enough. + */ + for (i = 2; i < d->br->count; i++) { + if (level < levels[i]) { + if (i == 2) + break; + if ((level - levels[i - 1]) < (levels[i] - level)) + i--; + break; + } + } + + *state = d->br->count - 1 - i; + return 0; +} + +static const struct thermal_cooling_device_ops video_cooling_ops = { + .get_max_state = int3406_thermal_get_max_state, + .get_cur_state = int3406_thermal_get_cur_state, + .set_cur_state = int3406_thermal_set_cur_state, +}; + +static int int3406_thermal_get_index(int *array, int nr, int value) +{ + int i; + + for (i = 0; i < nr; i++) { + if (array[i] == value) + break; + } + return i == nr ? -ENOENT : i; +} + +static void int3406_thermal_get_limit(struct int3406_thermal_data *d) +{ + acpi_status status; + unsigned long long lower_limit, upper_limit; + int index; + + status = acpi_evaluate_integer(d->handle, "DDDL", NULL, &lower_limit); + if (ACPI_SUCCESS(status)) { + index = int3406_thermal_get_index(d->br->levels, d->br->count, + lower_limit); + if (index > 0) { + d->lower_limit = (int)lower_limit; + d->lower_limit_index = index; + } + } + + status = acpi_evaluate_integer(d->handle, "DDPC", NULL, &upper_limit); + if (ACPI_SUCCESS(status)) { + index = int3406_thermal_get_index(d->br->levels, d->br->count, + upper_limit); + if (index > 0) { + d->upper_limit = (int)upper_limit; + d->upper_limit_index = index; + } + } +} + +static void int3406_notify(acpi_handle handle, u32 event, void *data) +{ + if (event == INT3406_BRIGHTNESS_LIMITS_CHANGED) + int3406_thermal_get_limit(data); +} + +static int int3406_thermal_probe(struct platform_device *pdev) +{ + struct acpi_device *adev = ACPI_COMPANION(&pdev->dev); + struct int3406_thermal_data *d; + struct backlight_device *bd; + int ret; + + if (!ACPI_HANDLE(&pdev->dev)) + return -ENODEV; + + d = devm_kzalloc(&pdev->dev, sizeof(*d), GFP_KERNEL); + if (!d) + return -ENOMEM; + d->handle = ACPI_HANDLE(&pdev->dev); + + bd = backlight_device_get_by_type(BACKLIGHT_RAW); + if (!bd) + return -ENODEV; + d->raw_bd = bd; + + ret = acpi_video_get_levels(ACPI_COMPANION(&pdev->dev), &d->br); + if (ret) + return ret; + + int3406_thermal_get_limit(d); + + d->cooling_dev = thermal_cooling_device_register(acpi_device_bid(adev), + d, &video_cooling_ops); + if (IS_ERR(d->cooling_dev)) + goto err; + + ret = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, + int3406_notify, d); + if (ret) + goto err_cdev; + + platform_set_drvdata(pdev, d); + + return 0; + +err_cdev: + thermal_cooling_device_unregister(d->cooling_dev); +err: + kfree(d->br); + return -ENODEV; +} + +static int int3406_thermal_remove(struct platform_device *pdev) +{ + struct int3406_thermal_data *d = platform_get_drvdata(pdev); + + thermal_cooling_device_unregister(d->cooling_dev); + kfree(d->br); + return 0; +} + +static const struct acpi_device_id int3406_thermal_match[] = { + {"INT3406", 0}, + {} +}; + +MODULE_DEVICE_TABLE(acpi, int3406_thermal_match); + +static struct platform_driver int3406_thermal_driver = { + .probe = int3406_thermal_probe, + .remove = int3406_thermal_remove, + .driver = { + .name = "int3406 thermal", + .owner = THIS_MODULE, + .acpi_match_table = int3406_thermal_match, + }, +}; + +module_platform_driver(int3406_thermal_driver); + +MODULE_DESCRIPTION("INT3406 Thermal driver"); +MODULE_LICENSE("GPL v2"); |