diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-24 18:21:43 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-24 18:21:43 (GMT) |
commit | 8264fce6de03f3915e2301f52f181a982718a8cb (patch) | |
tree | 2f24ce9411afc7132eb040b94d44c31bda6d13b0 /drivers/thermal/int340x_thermal/int3400_thermal.c | |
parent | 816fb4175c29b16948fb24a92053bea1e79908cc (diff) | |
parent | 6ceaf58abe25e86292152005c51169796bad3407 (diff) | |
download | linux-8264fce6de03f3915e2301f52f181a982718a8cb.tar.xz |
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
Pull thermal management updates from Zhang Rui:
"Sorry that I missed the merge window as there is a bug found in the
last minute, and I have to fix it and wait for the code to be tested
in linux-next tree for a few days. Now the buggy patch has been
dropped entirely from my next branch. Thus I hope those changes can
still be merged in 3.18-rc2 as most of them are platform thermal
driver changes.
Specifics:
- introduce ACPI INT340X thermal drivers.
Newer laptops and tablets may have thermal sensors and other
devices with thermal control capabilities that are exposed for the
OS to use via the ACPI INT340x device objects. Several drivers are
introduced to expose the temperature information and cooling
ability from these objects to user-space via the normal thermal
framework.
From: Lu Aaron, Lan Tianyu, Jacob Pan and Zhang Rui.
- introduce a new thermal governor, which just uses a hysteresis to
switch abruptly on/off a cooling device. This governor can be used
to control certain fan devices that can not be throttled but just
switched on or off. From: Peter Feuerer.
- introduce support for some new thermal interrupt functions on
i.MX6SX, in IMX thermal driver. From: Anson, Huang.
- introduce tracing support on thermal framework. From: Punit
Agrawal.
- small fixes in OF thermal and thermal step_wise governor"
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux: (25 commits)
Thermal: int340x thermal: select ACPI fan driver
Thermal: int3400_thermal: use acpi_thermal_rel parsing APIs
Thermal: int340x_thermal: expose acpi thermal relationship tables
Thermal: introduce int3403 thermal driver
Thermal: introduce INT3402 thermal driver
Thermal: move the KELVIN_TO_MILLICELSIUS macro to thermal.h
ACPI / Fan: support INT3404 thermal device
ACPI / Fan: add ACPI 4.0 style fan support
ACPI / fan: convert to platform driver
ACPI / fan: use acpi_device_xxx_power instead of acpi_bus equivelant
ACPI / fan: remove no need check for device pointer
ACPI / fan: remove unused macro
Thermal: int3400 thermal: register to thermal framework
Thermal: int3400 thermal: add capability to detect supporting UUIDs
Thermal: introduce int3400 thermal driver
ACPI: add ACPI_TYPE_LOCAL_REFERENCE support to acpi_extract_package()
ACPI: make acpi_create_platform_device() an external API
thermal: step_wise: fix: Prevent from binary overflow when trend is dropping
ACPI: introduce ACPI int340x thermal scan handler
thermal: Added Bang-bang thermal governor
...
Diffstat (limited to 'drivers/thermal/int340x_thermal/int3400_thermal.c')
-rw-r--r-- | drivers/thermal/int340x_thermal/int3400_thermal.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/drivers/thermal/int340x_thermal/int3400_thermal.c b/drivers/thermal/int340x_thermal/int3400_thermal.c new file mode 100644 index 0000000..edc1cce --- /dev/null +++ b/drivers/thermal/int340x_thermal/int3400_thermal.c @@ -0,0 +1,271 @@ +/* + * INT3400 thermal driver + * + * Copyright (C) 2014, Intel Corporation + * Authors: Zhang Rui <rui.zhang@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/thermal.h> +#include "acpi_thermal_rel.h" + +enum int3400_thermal_uuid { + INT3400_THERMAL_PASSIVE_1, + INT3400_THERMAL_PASSIVE_2, + INT3400_THERMAL_ACTIVE, + INT3400_THERMAL_CRITICAL, + INT3400_THERMAL_COOLING_MODE, + INT3400_THERMAL_MAXIMUM_UUID, +}; + +static u8 *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = { + "42A441D6-AE6A-462b-A84B-4A8CE79027D3", + "9E04115A-AE87-4D1C-9500-0F3E340BFE75", + "3A95C389-E4B8-4629-A526-C52C88626BAE", + "97C68AE7-15FA-499c-B8C9-5DA81D606E0A", + "16CAF1B7-DD38-40ed-B1C1-1B8A1913D531", +}; + +struct int3400_thermal_priv { + struct acpi_device *adev; + struct thermal_zone_device *thermal; + int mode; + int art_count; + struct art *arts; + int trt_count; + struct trt *trts; + u8 uuid_bitmap; + int rel_misc_dev_res; +}; + +static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv) +{ + struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL}; + union acpi_object *obja, *objb; + int i, j; + int result = 0; + acpi_status status; + + status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf); + if (ACPI_FAILURE(status)) + return -ENODEV; + + obja = (union acpi_object *)buf.pointer; + if (obja->type != ACPI_TYPE_PACKAGE) { + result = -EINVAL; + goto end; + } + + for (i = 0; i < obja->package.count; i++) { + objb = &obja->package.elements[i]; + if (objb->type != ACPI_TYPE_BUFFER) { + result = -EINVAL; + goto end; + } + + /* UUID must be 16 bytes */ + if (objb->buffer.length != 16) { + result = -EINVAL; + goto end; + } + + for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) { + u8 uuid[16]; + + acpi_str_to_uuid(int3400_thermal_uuids[j], uuid); + if (!strncmp(uuid, objb->buffer.pointer, 16)) { + priv->uuid_bitmap |= (1 << j); + break; + } + } + } + +end: + kfree(buf.pointer); + return result; +} + +static int int3400_thermal_run_osc(acpi_handle handle, + enum int3400_thermal_uuid uuid, bool enable) +{ + u32 ret, buf[2]; + acpi_status status; + int result = 0; + struct acpi_osc_context context = { + .uuid_str = int3400_thermal_uuids[uuid], + .rev = 1, + .cap.length = 8, + }; + + buf[OSC_QUERY_DWORD] = 0; + buf[OSC_SUPPORT_DWORD] = enable; + + context.cap.pointer = buf; + + status = acpi_run_osc(handle, &context); + if (ACPI_SUCCESS(status)) { + ret = *((u32 *)(context.ret.pointer + 4)); + if (ret != enable) + result = -EPERM; + } else + result = -EPERM; + + kfree(context.ret.pointer); + return result; +} + +static int int3400_thermal_get_temp(struct thermal_zone_device *thermal, + unsigned long *temp) +{ + *temp = 20 * 1000; /* faked temp sensor with 20C */ + return 0; +} + +static int int3400_thermal_get_mode(struct thermal_zone_device *thermal, + enum thermal_device_mode *mode) +{ + struct int3400_thermal_priv *priv = thermal->devdata; + + if (!priv) + return -EINVAL; + + *mode = priv->mode; + + return 0; +} + +static int int3400_thermal_set_mode(struct thermal_zone_device *thermal, + enum thermal_device_mode mode) +{ + struct int3400_thermal_priv *priv = thermal->devdata; + bool enable; + int result = 0; + + if (!priv) + return -EINVAL; + + if (mode == THERMAL_DEVICE_ENABLED) + enable = true; + else if (mode == THERMAL_DEVICE_DISABLED) + enable = false; + else + return -EINVAL; + + if (enable != priv->mode) { + priv->mode = enable; + /* currently, only PASSIVE COOLING is supported */ + result = int3400_thermal_run_osc(priv->adev->handle, + INT3400_THERMAL_PASSIVE_1, enable); + } + return result; +} + +static struct thermal_zone_device_ops int3400_thermal_ops = { + .get_temp = int3400_thermal_get_temp, +}; + +static struct thermal_zone_params int3400_thermal_params = { + .governor_name = "user_space", + .no_hwmon = true, +}; + +static int int3400_thermal_probe(struct platform_device *pdev) +{ + struct acpi_device *adev = ACPI_COMPANION(&pdev->dev); + struct int3400_thermal_priv *priv; + int result; + + if (!adev) + return -ENODEV; + + priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->adev = adev; + + result = int3400_thermal_get_uuids(priv); + if (result) + goto free_priv; + + result = acpi_parse_art(priv->adev->handle, &priv->art_count, + &priv->arts, true); + if (result) + goto free_priv; + + + result = acpi_parse_trt(priv->adev->handle, &priv->trt_count, + &priv->trts, true); + if (result) + goto free_art; + + platform_set_drvdata(pdev, priv); + + if (priv->uuid_bitmap & 1 << INT3400_THERMAL_PASSIVE_1) { + int3400_thermal_ops.get_mode = int3400_thermal_get_mode; + int3400_thermal_ops.set_mode = int3400_thermal_set_mode; + } + priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0, + priv, &int3400_thermal_ops, + &int3400_thermal_params, 0, 0); + if (IS_ERR(priv->thermal)) { + result = PTR_ERR(priv->thermal); + goto free_trt; + } + + priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add( + priv->adev->handle); + + return 0; +free_trt: + kfree(priv->trts); +free_art: + kfree(priv->arts); +free_priv: + kfree(priv); + return result; +} + +static int int3400_thermal_remove(struct platform_device *pdev) +{ + struct int3400_thermal_priv *priv = platform_get_drvdata(pdev); + + if (!priv->rel_misc_dev_res) + acpi_thermal_rel_misc_device_remove(priv->adev->handle); + + thermal_zone_device_unregister(priv->thermal); + kfree(priv->trts); + kfree(priv->arts); + kfree(priv); + return 0; +} + +static const struct acpi_device_id int3400_thermal_match[] = { + {"INT3400", 0}, + {} +}; + +MODULE_DEVICE_TABLE(acpi, int3400_thermal_match); + +static struct platform_driver int3400_thermal_driver = { + .probe = int3400_thermal_probe, + .remove = int3400_thermal_remove, + .driver = { + .name = "int3400 thermal", + .owner = THIS_MODULE, + .acpi_match_table = ACPI_PTR(int3400_thermal_match), + }, +}; + +module_platform_driver(int3400_thermal_driver); + +MODULE_DESCRIPTION("INT3400 Thermal driver"); +MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>"); +MODULE_LICENSE("GPL"); |