linux/drivers/acpi/fan.c
Linus Torvalds 8264fce6de 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
  ...
2014-10-24 11:21:43 -07:00

415 lines
10 KiB
C

/*
* acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
*
* 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.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include <linux/thermal.h>
#include <linux/acpi.h>
#include <linux/platform_device.h>
#include <linux/sort.h>
MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION("ACPI Fan Driver");
MODULE_LICENSE("GPL");
static int acpi_fan_probe(struct platform_device *pdev);
static int acpi_fan_remove(struct platform_device *pdev);
static const struct acpi_device_id fan_device_ids[] = {
{"PNP0C0B", 0},
{"INT3404", 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, fan_device_ids);
#ifdef CONFIG_PM_SLEEP
static int acpi_fan_suspend(struct device *dev);
static int acpi_fan_resume(struct device *dev);
static struct dev_pm_ops acpi_fan_pm = {
.resume = acpi_fan_resume,
.freeze = acpi_fan_suspend,
.thaw = acpi_fan_resume,
.restore = acpi_fan_resume,
};
#define FAN_PM_OPS_PTR (&acpi_fan_pm)
#else
#define FAN_PM_OPS_PTR NULL
#endif
struct acpi_fan_fps {
u64 control;
u64 trip_point;
u64 speed;
u64 noise_level;
u64 power;
};
struct acpi_fan_fif {
u64 revision;
u64 fine_grain_ctrl;
u64 step_size;
u64 low_speed_notification;
};
struct acpi_fan {
bool acpi4;
struct acpi_fan_fif fif;
struct acpi_fan_fps *fps;
int fps_count;
struct thermal_cooling_device *cdev;
};
static struct platform_driver acpi_fan_driver = {
.probe = acpi_fan_probe,
.remove = acpi_fan_remove,
.driver = {
.name = "acpi-fan",
.acpi_match_table = fan_device_ids,
.pm = FAN_PM_OPS_PTR,
},
};
/* thermal cooling device callbacks */
static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
*state)
{
struct acpi_device *device = cdev->devdata;
struct acpi_fan *fan = acpi_driver_data(device);
if (fan->acpi4)
*state = fan->fps_count - 1;
else
*state = 1;
return 0;
}
static int fan_get_state_acpi4(struct acpi_device *device, unsigned long *state)
{
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_fan *fan = acpi_driver_data(device);
union acpi_object *obj;
acpi_status status;
int control, i;
status = acpi_evaluate_object(device->handle, "_FST", NULL, &buffer);
if (ACPI_FAILURE(status)) {
dev_err(&device->dev, "Get fan state failed\n");
return status;
}
obj = buffer.pointer;
if (!obj || obj->type != ACPI_TYPE_PACKAGE ||
obj->package.count != 3 ||
obj->package.elements[1].type != ACPI_TYPE_INTEGER) {
dev_err(&device->dev, "Invalid _FST data\n");
status = -EINVAL;
goto err;
}
control = obj->package.elements[1].integer.value;
for (i = 0; i < fan->fps_count; i++) {
if (control == fan->fps[i].control)
break;
}
if (i == fan->fps_count) {
dev_dbg(&device->dev, "Invalid control value returned\n");
status = -EINVAL;
goto err;
}
*state = i;
err:
kfree(obj);
return status;
}
static int fan_get_state(struct acpi_device *device, unsigned long *state)
{
int result;
int acpi_state = ACPI_STATE_D0;
result = acpi_device_update_power(device, &acpi_state);
if (result)
return result;
*state = (acpi_state == ACPI_STATE_D3_COLD ? 0 :
(acpi_state == ACPI_STATE_D0 ? 1 : -1));
return 0;
}
static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
*state)
{
struct acpi_device *device = cdev->devdata;
struct acpi_fan *fan = acpi_driver_data(device);
if (fan->acpi4)
return fan_get_state_acpi4(device, state);
else
return fan_get_state(device, state);
}
static int fan_set_state(struct acpi_device *device, unsigned long state)
{
if (state != 0 && state != 1)
return -EINVAL;
return acpi_device_set_power(device,
state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
}
static int fan_set_state_acpi4(struct acpi_device *device, unsigned long state)
{
struct acpi_fan *fan = acpi_driver_data(device);
acpi_status status;
if (state >= fan->fps_count)
return -EINVAL;
status = acpi_execute_simple_method(device->handle, "_FSL",
fan->fps[state].control);
if (ACPI_FAILURE(status)) {
dev_dbg(&device->dev, "Failed to set state by _FSL\n");
return status;
}
return 0;
}
static int
fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
{
struct acpi_device *device = cdev->devdata;
struct acpi_fan *fan = acpi_driver_data(device);
if (fan->acpi4)
return fan_set_state_acpi4(device, state);
else
return fan_set_state(device, state);
}
static const struct thermal_cooling_device_ops fan_cooling_ops = {
.get_max_state = fan_get_max_state,
.get_cur_state = fan_get_cur_state,
.set_cur_state = fan_set_cur_state,
};
/* --------------------------------------------------------------------------
* Driver Interface
* --------------------------------------------------------------------------
*/
static bool acpi_fan_is_acpi4(struct acpi_device *device)
{
return acpi_has_method(device->handle, "_FIF") &&
acpi_has_method(device->handle, "_FPS") &&
acpi_has_method(device->handle, "_FSL") &&
acpi_has_method(device->handle, "_FST");
}
static int acpi_fan_get_fif(struct acpi_device *device)
{
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_fan *fan = acpi_driver_data(device);
struct acpi_buffer format = { sizeof("NNNN"), "NNNN" };
struct acpi_buffer fif = { sizeof(fan->fif), &fan->fif };
union acpi_object *obj;
acpi_status status;
status = acpi_evaluate_object(device->handle, "_FIF", NULL, &buffer);
if (ACPI_FAILURE(status))
return status;
obj = buffer.pointer;
if (!obj || obj->type != ACPI_TYPE_PACKAGE) {
dev_err(&device->dev, "Invalid _FIF data\n");
status = -EINVAL;
goto err;
}
status = acpi_extract_package(obj, &format, &fif);
if (ACPI_FAILURE(status)) {
dev_err(&device->dev, "Invalid _FIF element\n");
status = -EINVAL;
}
err:
kfree(obj);
return status;
}
static int acpi_fan_speed_cmp(const void *a, const void *b)
{
const struct acpi_fan_fps *fps1 = a;
const struct acpi_fan_fps *fps2 = b;
return fps1->speed - fps2->speed;
}
static int acpi_fan_get_fps(struct acpi_device *device)
{
struct acpi_fan *fan = acpi_driver_data(device);
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
acpi_status status;
int i;
status = acpi_evaluate_object(device->handle, "_FPS", NULL, &buffer);
if (ACPI_FAILURE(status))
return status;
obj = buffer.pointer;
if (!obj || obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) {
dev_err(&device->dev, "Invalid _FPS data\n");
status = -EINVAL;
goto err;
}
fan->fps_count = obj->package.count - 1; /* minus revision field */
fan->fps = devm_kzalloc(&device->dev,
fan->fps_count * sizeof(struct acpi_fan_fps),
GFP_KERNEL);
if (!fan->fps) {
dev_err(&device->dev, "Not enough memory\n");
status = -ENOMEM;
goto err;
}
for (i = 0; i < fan->fps_count; i++) {
struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
struct acpi_buffer fps = { sizeof(fan->fps[i]), &fan->fps[i] };
status = acpi_extract_package(&obj->package.elements[i + 1],
&format, &fps);
if (ACPI_FAILURE(status)) {
dev_err(&device->dev, "Invalid _FPS element\n");
break;
}
}
/* sort the state array according to fan speed in increase order */
sort(fan->fps, fan->fps_count, sizeof(*fan->fps),
acpi_fan_speed_cmp, NULL);
err:
kfree(obj);
return status;
}
static int acpi_fan_probe(struct platform_device *pdev)
{
int result = 0;
struct thermal_cooling_device *cdev;
struct acpi_fan *fan;
struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);
if (!fan) {
dev_err(&device->dev, "No memory for fan\n");
return -ENOMEM;
}
device->driver_data = fan;
platform_set_drvdata(pdev, fan);
if (acpi_fan_is_acpi4(device)) {
if (acpi_fan_get_fif(device) || acpi_fan_get_fps(device))
goto end;
fan->acpi4 = true;
} else {
result = acpi_device_update_power(device, NULL);
if (result) {
dev_err(&device->dev, "Setting initial power state\n");
goto end;
}
}
cdev = thermal_cooling_device_register("Fan", device,
&fan_cooling_ops);
if (IS_ERR(cdev)) {
result = PTR_ERR(cdev);
goto end;
}
dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id);
fan->cdev = cdev;
result = sysfs_create_link(&pdev->dev.kobj,
&cdev->device.kobj,
"thermal_cooling");
if (result)
dev_err(&pdev->dev, "Failed to create sysfs link 'thermal_cooling'\n");
result = sysfs_create_link(&cdev->device.kobj,
&pdev->dev.kobj,
"device");
if (result)
dev_err(&pdev->dev, "Failed to create sysfs link 'device'\n");
end:
return result;
}
static int acpi_fan_remove(struct platform_device *pdev)
{
struct acpi_fan *fan = platform_get_drvdata(pdev);
sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling");
sysfs_remove_link(&fan->cdev->device.kobj, "device");
thermal_cooling_device_unregister(fan->cdev);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int acpi_fan_suspend(struct device *dev)
{
struct acpi_fan *fan = dev_get_drvdata(dev);
if (fan->acpi4)
return 0;
acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D0);
return AE_OK;
}
static int acpi_fan_resume(struct device *dev)
{
int result;
struct acpi_fan *fan = dev_get_drvdata(dev);
if (fan->acpi4)
return 0;
result = acpi_device_update_power(ACPI_COMPANION(dev), NULL);
if (result)
dev_err(dev, "Error updating fan power state\n");
return result;
}
#endif
module_platform_driver(acpi_fan_driver);