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ACPI: register ACPI Fan as generic thermal cooling device 

Register ACPI Fan as thermal cooling device.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Thomas Sujith <sujith.thomas@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
hifive-unleashed-5.1
Zhang Rui 2008-01-17 15:51:24 +08:00 committed by Len Brown
parent ce44e19701
commit 05a83d9722
1 changed files with 83 additions and 7 deletions
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90
drivers/acpi/fan.c
View File

@ -30,7 +30,7 @@
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#include <linux/thermal.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
@ -68,9 +68,55 @@ static struct acpi_driver acpi_fan_driver = {
},
};
/* thermal cooling device callbacks */
static int fan_get_max_state(struct thermal_cooling_device *cdev, char *buf)
{
/* ACPI fan device only support two states: ON/OFF */
return sprintf(buf, "1\n");
}
static int fan_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
{
struct acpi_device *device = cdev->devdata;
int state;
int result;
if (!device)
return -EINVAL;
result = acpi_bus_get_power(device->handle, &state);
if (result)
return result;
return sprintf(buf, "%s\n", state == ACPI_STATE_D3 ? "0" :
(state == ACPI_STATE_D0 ? "1" : "unknown"));
}
static int
fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
{
struct acpi_device *device = cdev->devdata;
int result;
if (!device || (state != 0 && state != 1))
return -EINVAL;
result = acpi_bus_set_power(device->handle,
state ? ACPI_STATE_D0 : ACPI_STATE_D3);
return result;
}
static 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,
};
/* --------------------------------------------------------------------------
FS Interface (/proc)
-------------------------------------------------------------------------- */
#ifdef CONFIG_ACPI_PROCFS
static struct proc_dir_entry *acpi_fan_dir;
@ -171,7 +217,17 @@ static int acpi_fan_remove_fs(struct acpi_device *device)
return 0;
}
#else
static int acpi_fan_add_fs(struct acpi_device *device)
{
return 0;
}
static int acpi_fan_remove_fs(struct acpi_device *device)
{
return 0;
}
#endif
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
@ -179,9 +235,8 @@ static int acpi_fan_remove_fs(struct acpi_device *device)
static int acpi_fan_add(struct acpi_device *device)
{
int result = 0;
struct acpi_fan *fan = NULL;
int state = 0;
struct thermal_cooling_device *cdev;
if (!device)
return -EINVAL;
@ -199,6 +254,25 @@ static int acpi_fan_add(struct acpi_device *device)
acpi_bus_set_power(device->handle, state);
device->flags.force_power_state = 0;
cdev = thermal_cooling_device_register("Fan", device,
&fan_cooling_ops);
if (cdev)
printk(KERN_INFO PREFIX
"%s is registered as cooling_device%d\n",
device->dev.bus_id, cdev->id);
else
goto end;
acpi_driver_data(device) = cdev;
result = sysfs_create_link(&device->dev.kobj, &cdev->device.kobj,
"thermal_cooling");
if (result)
return result;
result = sysfs_create_link(&cdev->device.kobj, &device->dev.kobj,
"device");
if (result)
return result;
result = acpi_fan_add_fs(device);
if (result)
goto end;
@ -208,18 +282,20 @@ static int acpi_fan_add(struct acpi_device *device)
!device->power.state ? "on" : "off");
end:
if (result)
kfree(fan);
return result;
}
static int acpi_fan_remove(struct acpi_device *device, int type)
{
if (!device || !acpi_driver_data(device))
struct thermal_cooling_device *cdev = acpi_driver_data(device);
if (!device || !cdev)
return -EINVAL;
acpi_fan_remove_fs(device);
sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
sysfs_remove_link(&cdev->device.kobj, "device");
thermal_cooling_device_unregister(cdev);
return 0;
}