drivers/net/wireless/ath/ath10k/thermal.c

/*
 * 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");
}