drivers/net/wireless/ath/ath11k/thermal.c

   1 // SPDX-License-Identifier: BSD-3-Clause-Clear
   2 /*
   3  * Copyright (c) 2020 The Linux Foundation. All rights reserved.
   4  * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
   5  */
   6
   7 #include <linux/device.h>
   8 #include <linux/sysfs.h>
   9 #include <linux/thermal.h>
  10 #include <linux/hwmon.h>
  11 #include <linux/hwmon-sysfs.h>
  12 #include "core.h"
  13 #include "debug.h"
  14
  15 static int
  16 ath11k_thermal_get_max_throttle_state(struct thermal_cooling_device *cdev,
  17                                       unsigned long *state)
  18 {
  19         *state = ATH11K_THERMAL_THROTTLE_MAX;
  20
  21         return 0;
  22 }
  23
  24 static int
  25 ath11k_thermal_get_cur_throttle_state(struct thermal_cooling_device *cdev,
  26                                       unsigned long *state)
  27 {
  28         struct ath11k *ar = cdev->devdata;
  29
  30         mutex_lock(&ar->conf_mutex);
  31         *state = ar->thermal.throttle_state;
  32         mutex_unlock(&ar->conf_mutex);
  33
  34         return 0;
  35 }
  36
  37 static int
  38 ath11k_thermal_set_cur_throttle_state(struct thermal_cooling_device *cdev,
  39                                       unsigned long throttle_state)
  40 {
  41         struct ath11k *ar = cdev->devdata;
  42         int ret;
  43
  44         if (throttle_state > ATH11K_THERMAL_THROTTLE_MAX) {
  45                 ath11k_warn(ar->ab, "throttle state %ld is exceeding the limit %d\n",
  46                             throttle_state, ATH11K_THERMAL_THROTTLE_MAX);
  47                 return -EINVAL;
  48         }
  49         mutex_lock(&ar->conf_mutex);
  50         ret = ath11k_thermal_set_throttling(ar, throttle_state);
  51         if (ret == 0)
  52                 ar->thermal.throttle_state = throttle_state;
  53         mutex_unlock(&ar->conf_mutex);
  54         return ret;
  55 }
  56
  57 static const struct thermal_cooling_device_ops ath11k_thermal_ops = {
  58         .get_max_state = ath11k_thermal_get_max_throttle_state,
  59         .get_cur_state = ath11k_thermal_get_cur_throttle_state,
  60         .set_cur_state = ath11k_thermal_set_cur_throttle_state,
  61 };
  62
  63 static ssize_t ath11k_thermal_show_temp(struct device *dev,
  64                                         struct device_attribute *attr,
  65                                         char *buf)
  66 {
  67         struct ath11k *ar = dev_get_drvdata(dev);
  68         int ret, temperature;
  69         unsigned long time_left;
  70
  71         mutex_lock(&ar->conf_mutex);
  72
  73         /* Can't get temperature when the card is off */
  74         if (ar->state != ATH11K_STATE_ON) {
  75                 ret = -ENETDOWN;
  76                 goto out;
  77         }
  78
  79         reinit_completion(&ar->thermal.wmi_sync);
  80         ret = ath11k_wmi_send_pdev_temperature_cmd(ar);
  81         if (ret) {
  82                 ath11k_warn(ar->ab, "failed to read temperature %d\n", ret);
  83                 goto out;
  84         }
  85
  86         if (test_bit(ATH11K_FLAG_CRASH_FLUSH, &ar->ab->dev_flags)) {
  87                 ret = -ESHUTDOWN;
  88                 goto out;
  89         }
  90
  91         time_left = wait_for_completion_timeout(&ar->thermal.wmi_sync,
  92                                                 ATH11K_THERMAL_SYNC_TIMEOUT_HZ);
  93         if (!time_left) {
  94                 ath11k_warn(ar->ab, "failed to synchronize thermal read\n");
  95                 ret = -ETIMEDOUT;
  96                 goto out;
  97         }
  98
  99         spin_lock_bh(&ar->data_lock);
 100         temperature = ar->thermal.temperature;
 101         spin_unlock_bh(&ar->data_lock);
 102
 103         /* display in millidegree Celsius */
 104         ret = snprintf(buf, PAGE_SIZE, "%d\n", temperature * 1000);
 105 out:
 106         mutex_unlock(&ar->conf_mutex);
 107         return ret;
 108 }
 109
 110 void ath11k_thermal_event_temperature(struct ath11k *ar, int temperature)
 111 {
 112         spin_lock_bh(&ar->data_lock);
 113         ar->thermal.temperature = temperature;
 114         spin_unlock_bh(&ar->data_lock);
 115         complete(&ar->thermal.wmi_sync);
 116 }
 117
 118 static SENSOR_DEVICE_ATTR(temp1_input, 0444, ath11k_thermal_show_temp,
 119                           NULL, 0);
 120
 121 static struct attribute *ath11k_hwmon_attrs[] = {
 122         &sensor_dev_attr_temp1_input.dev_attr.attr,
 123         NULL,
 124 };
 125 ATTRIBUTE_GROUPS(ath11k_hwmon);
 126
 127 int ath11k_thermal_set_throttling(struct ath11k *ar, u32 throttle_state)
 128 {
 129         struct ath11k_base *ab = ar->ab;
 130         struct thermal_mitigation_params param;
 131         int ret = 0;
 132
 133         lockdep_assert_held(&ar->conf_mutex);
 134
 135         if (ar->state != ATH11K_STATE_ON)
 136                 return 0;
 137
 138         memset(&param, 0, sizeof(param));
 139         param.pdev_id = ar->pdev->pdev_id;
 140         param.enable = throttle_state ? 1 : 0;
 141         param.dc = ATH11K_THERMAL_DEFAULT_DUTY_CYCLE;
 142         param.dc_per_event = 0xFFFFFFFF;
 143
 144         param.levelconf[0].tmplwm = ATH11K_THERMAL_TEMP_LOW_MARK;
 145         param.levelconf[0].tmphwm = ATH11K_THERMAL_TEMP_HIGH_MARK;
 146         param.levelconf[0].dcoffpercent = throttle_state;
 147         param.levelconf[0].priority = 0; /* disable all data tx queues */
 148
 149         ret = ath11k_wmi_send_thermal_mitigation_param_cmd(ar, &param);
 150         if (ret) {
 151                 ath11k_warn(ab, "failed to send thermal mitigation duty cycle %u ret %d\n",
 152                             throttle_state, ret);
 153         }
 154
 155         return ret;
 156 }
 157
 158 int ath11k_thermal_register(struct ath11k_base *ab)
 159 {
 160         struct thermal_cooling_device *cdev;
 161         struct device *hwmon_dev;
 162         struct ath11k *ar;
 163         struct ath11k_pdev *pdev;
 164         int i, ret;
 165
 166         for (i = 0; i < ab->num_radios; i++) {
 167                 pdev = &ab->pdevs[i];
 168                 ar = pdev->ar;
 169                 if (!ar)
 170                         continue;
 171
 172                 cdev = thermal_cooling_device_register("ath11k_thermal", ar,
 173                                                        &ath11k_thermal_ops);
 174
 175                 if (IS_ERR(cdev)) {
 176                         ath11k_err(ab, "failed to setup thermal device result: %ld\n",
 177                                    PTR_ERR(cdev));
 178                         ret = -EINVAL;
 179                         goto err_thermal_destroy;
 180                 }
 181
 182                 ar->thermal.cdev = cdev;
 183
 184                 ret = sysfs_create_link(&ar->hw->wiphy->dev.kobj, &cdev->device.kobj,
 185                                         "cooling_device");
 186                 if (ret) {
 187                         ath11k_err(ab, "failed to create cooling device symlink\n");
 188                         goto err_thermal_destroy;
 189                 }
 190
 191                 if (!IS_REACHABLE(CONFIG_HWMON))
 192                         return 0;
 193
 194                 hwmon_dev = devm_hwmon_device_register_with_groups(&ar->hw->wiphy->dev,
 195                                                                    "ath11k_hwmon", ar,
 196                                                                    ath11k_hwmon_groups);
 197                 if (IS_ERR(hwmon_dev)) {
 198                         ath11k_err(ar->ab, "failed to register hwmon device: %ld\n",
 199                                    PTR_ERR(hwmon_dev));
 200                         ret = -EINVAL;
 201                         goto err_thermal_destroy;
 202                 }
 203         }
 204
 205         return 0;
 206
 207 err_thermal_destroy:
 208         ath11k_thermal_unregister(ab);
 209         return ret;
 210 }
 211
 212 void ath11k_thermal_unregister(struct ath11k_base *ab)
 213 {
 214         struct ath11k *ar;
 215         struct ath11k_pdev *pdev;
 216         int i;
 217
 218         for (i = 0; i < ab->num_radios; i++) {
 219                 pdev = &ab->pdevs[i];
 220                 ar = pdev->ar;
 221                 if (!ar)
 222                         continue;
 223
 224                 sysfs_remove_link(&ar->hw->wiphy->dev.kobj, "cooling_device");
 225                 thermal_cooling_device_unregister(ar->thermal.cdev);
 226         }
 227 }