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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 <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include "core.h"
#include "debug.h"
#include "wmi-ops.h"
static int
ath10k_thermal_get_max_throttle_state(struct thermal_cooling_device *cdev,
unsigned long *state)
{
*state = ATH10K_THERMAL_THROTTLE_MAX;
return 0;
}
static int
ath10k_thermal_get_cur_throttle_state(struct thermal_cooling_device *cdev,
unsigned long *state)
{
struct ath10k *ar = cdev->devdata;
mutex_lock(&ar->conf_mutex);
*state = ar->thermal.throttle_state;
mutex_unlock(&ar->conf_mutex);
return 0;
}
static int
ath10k_thermal_set_cur_throttle_state(struct thermal_cooling_device *cdev,
unsigned long throttle_state)
{
struct ath10k *ar = cdev->devdata;
if (throttle_state > ATH10K_THERMAL_THROTTLE_MAX) {
ath10k_warn(ar, "throttle state %ld is exceeding the limit %d\n",
throttle_state, ATH10K_THERMAL_THROTTLE_MAX);
return -EINVAL;
}
mutex_lock(&ar->conf_mutex);
ar->thermal.throttle_state = throttle_state;
ath10k_thermal_set_throttling(ar);
mutex_unlock(&ar->conf_mutex);
return 0;
}
static struct thermal_cooling_device_ops ath10k_thermal_ops = {
.get_max_state = ath10k_thermal_get_max_throttle_state,
.get_cur_state = ath10k_thermal_get_cur_throttle_state,
.set_cur_state = ath10k_thermal_set_cur_throttle_state,
};
static ssize_t ath10k_thermal_show_temp(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct ath10k *ar = dev_get_drvdata(dev);
int ret, temperature;
unsigned long time_left;
mutex_lock(&ar->conf_mutex);
/* Can't get temperature when the card is off */
if (ar->state != ATH10K_STATE_ON) {
ret = -ENETDOWN;
goto out;
}
reinit_completion(&ar->thermal.wmi_sync);
ret = ath10k_wmi_pdev_get_temperature(ar);
if (ret) {
ath10k_warn(ar, "failed to read temperature %d\n", ret);
goto out;
}
if (test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags)) {
ret = -ESHUTDOWN;
goto out;
}
time_left = wait_for_completion_timeout(&ar->thermal.wmi_sync,
ATH10K_THERMAL_SYNC_TIMEOUT_HZ);
if (!time_left) {
ath10k_warn(ar, "failed to synchronize thermal read\n");
ret = -ETIMEDOUT;
goto out;
}
spin_lock_bh(&ar->data_lock);
temperature = ar->thermal.temperature;
spin_unlock_bh(&ar->data_lock);
/* display in millidegree celcius */
ret = snprintf(buf, PAGE_SIZE, "%d\n", temperature * 1000);
out:
mutex_unlock(&ar->conf_mutex);
return ret;
}
void ath10k_thermal_event_temperature(struct ath10k *ar, int temperature)
{
spin_lock_bh(&ar->data_lock);
ar->thermal.temperature = temperature;
spin_unlock_bh(&ar->data_lock);
complete(&ar->thermal.wmi_sync);
}
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ath10k_thermal_show_temp,
NULL, 0);
static struct attribute *ath10k_hwmon_attrs[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
NULL,
};
ATTRIBUTE_GROUPS(ath10k_hwmon);
void ath10k_thermal_set_throttling(struct ath10k *ar)
{
u32 period, duration, enabled;
int ret;
lockdep_assert_held(&ar->conf_mutex);
if (!ar->wmi.ops->gen_pdev_set_quiet_mode)
return;
if (ar->state != ATH10K_STATE_ON)
return;
period = ar->thermal.quiet_period;
duration = (period * ar->thermal.throttle_state) / 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);
}
}
int ath10k_thermal_register(struct ath10k *ar)
{
struct thermal_cooling_device *cdev;
struct device *hwmon_dev;
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 cooling device symlink\n");
goto err_cooling_destroy;
}
ar->thermal.cdev = cdev;
ar->thermal.quiet_period = ATH10K_QUIET_PERIOD_DEFAULT;
/* Do not register hwmon device when temperature reading is not
* supported by firmware
*/
if (!(ar->wmi.ops->gen_pdev_get_temperature))
return 0;
/* Avoid linking error on devm_hwmon_device_register_with_groups, I
* guess linux/hwmon.h is missing proper stubs.
*/
if (!IS_REACHABLE(CONFIG_HWMON))
return 0;
hwmon_dev = devm_hwmon_device_register_with_groups(ar->dev,
"ath10k_hwmon", ar,
ath10k_hwmon_groups);
if (IS_ERR(hwmon_dev)) {
ath10k_err(ar, "failed to register hwmon device: %ld\n",
PTR_ERR(hwmon_dev));
ret = -EINVAL;
goto err_remove_link;
}
return 0;
err_remove_link:
sysfs_remove_link(&ar->dev->kobj, "cooling_device");
err_cooling_destroy:
thermal_cooling_device_unregister(cdev);
return ret;
}
void ath10k_thermal_unregister(struct ath10k *ar)
{
sysfs_remove_link(&ar->dev->kobj, "cooling_device");
thermal_cooling_device_unregister(ar->thermal.cdev);
}
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