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/*
* Copyright (c) 2014 Qualcomm Atheros, Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <linux/device.h>
#include <linux/sysfs.h>
#include <linux/thermal.h>
#include "core.h"
#include "debug.h"
#include "wmi-ops.h"
static int ath10k_thermal_get_active_vifs(struct ath10k *ar,
enum wmi_vdev_type type)
{
struct ath10k_vif *arvif;
int count = 0;
lockdep_assert_held(&ar->conf_mutex);
list_for_each_entry(arvif, &ar->arvifs, list) {
if (!arvif->is_started)
continue;
if (!arvif->is_up)
continue;
if (arvif->vdev_type != type)
continue;
count++;
}
return count;
}
static int ath10k_thermal_get_max_dutycycle(struct thermal_cooling_device *cdev,
unsigned long *state)
{
*state = ATH10K_QUIET_DUTY_CYCLE_MAX;
return 0;
}
static int ath10k_thermal_get_cur_dutycycle(struct thermal_cooling_device *cdev,
unsigned long *state)
{
struct ath10k *ar = cdev->devdata;
mutex_lock(&ar->conf_mutex);
*state = ar->thermal.duty_cycle;
mutex_unlock(&ar->conf_mutex);
return 0;
}
static int ath10k_thermal_set_cur_dutycycle(struct thermal_cooling_device *cdev,
unsigned long duty_cycle)
{
struct ath10k *ar = cdev->devdata;
u32 period, duration, enabled;
int num_bss, ret = 0;
mutex_lock(&ar->conf_mutex);
if (ar->state != ATH10K_STATE_ON) {
ret = -ENETDOWN;
goto out;
}
if (duty_cycle > ATH10K_QUIET_DUTY_CYCLE_MAX) {
ath10k_warn(ar, "duty cycle %ld is exceeding the limit %d\n",
duty_cycle, ATH10K_QUIET_DUTY_CYCLE_MAX);
ret = -EINVAL;
goto out;
}
/* TODO: Right now, thermal mitigation is handled only for single/multi
* vif AP mode. Since quiet param is not validated in STA mode, it needs
* to be investigated further to handle multi STA and multi-vif (AP+STA)
* mode properly.
*/
num_bss = ath10k_thermal_get_active_vifs(ar, WMI_VDEV_TYPE_AP);
if (!num_bss) {
ath10k_warn(ar, "no active AP interfaces\n");
ret = -ENETDOWN;
goto out;
}
period = max(ATH10K_QUIET_PERIOD_MIN,
(ATH10K_QUIET_PERIOD_DEFAULT / num_bss));
duration = period * (duty_cycle / 100);
enabled = duration ? 1 : 0;
ret = ath10k_wmi_pdev_set_quiet_mode(ar, period, duration,
ATH10K_QUIET_START_OFFSET,
enabled);
if (ret) {
ath10k_warn(ar, "failed to set quiet mode period %u duarion %u enabled %u ret %d\n",
period, duration, enabled, ret);
goto out;
}
ar->thermal.duty_cycle = duty_cycle;
out:
mutex_unlock(&ar->conf_mutex);
return ret;
}
static struct thermal_cooling_device_ops ath10k_thermal_ops = {
.get_max_state = ath10k_thermal_get_max_dutycycle,
.get_cur_state = ath10k_thermal_get_cur_dutycycle,
.set_cur_state = ath10k_thermal_set_cur_dutycycle,
};
int ath10k_thermal_register(struct ath10k *ar)
{
struct thermal_cooling_device *cdev;
int ret;
cdev = thermal_cooling_device_register("ath10k_thermal", ar,
&ath10k_thermal_ops);
if (IS_ERR(cdev)) {
ath10k_err(ar, "failed to setup thermal device result: %ld\n",
PTR_ERR(cdev));
return -EINVAL;
}
ret = sysfs_create_link(&ar->dev->kobj, &cdev->device.kobj,
"cooling_device");
if (ret) {
ath10k_err(ar, "failed to create thermal symlink\n");
goto err_cooling_destroy;
}
ar->thermal.cdev = cdev;
return 0;
err_cooling_destroy:
thermal_cooling_device_unregister(cdev);
return ret;
}
void ath10k_thermal_unregister(struct ath10k *ar)
{
thermal_cooling_device_unregister(ar->thermal.cdev);
sysfs_remove_link(&ar->dev->kobj, "cooling_device");
}
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