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