1 // SPDX-License-Identifier: ISC
2 /*
3 * Copyright (c) 2014-2015 Qualcomm Atheros, Inc.
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 #include "wmi-ops.h"
14
15 static int
ath10k_thermal_get_max_throttle_state(struct thermal_cooling_device * cdev,unsigned long * state)16 ath10k_thermal_get_max_throttle_state(struct thermal_cooling_device *cdev,
17 unsigned long *state)
18 {
19 *state = ATH10K_THERMAL_THROTTLE_MAX;
20
21 return 0;
22 }
23
24 static int
ath10k_thermal_get_cur_throttle_state(struct thermal_cooling_device * cdev,unsigned long * state)25 ath10k_thermal_get_cur_throttle_state(struct thermal_cooling_device *cdev,
26 unsigned long *state)
27 {
28 struct ath10k *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
ath10k_thermal_set_cur_throttle_state(struct thermal_cooling_device * cdev,unsigned long throttle_state)38 ath10k_thermal_set_cur_throttle_state(struct thermal_cooling_device *cdev,
39 unsigned long throttle_state)
40 {
41 struct ath10k *ar = cdev->devdata;
42
43 if (throttle_state > ATH10K_THERMAL_THROTTLE_MAX) {
44 ath10k_warn(ar, "throttle state %ld is exceeding the limit %d\n",
45 throttle_state, ATH10K_THERMAL_THROTTLE_MAX);
46 return -EINVAL;
47 }
48 mutex_lock(&ar->conf_mutex);
49 ar->thermal.throttle_state = throttle_state;
50 ath10k_thermal_set_throttling(ar);
51 mutex_unlock(&ar->conf_mutex);
52 return 0;
53 }
54
55 static const struct thermal_cooling_device_ops ath10k_thermal_ops = {
56 .get_max_state = ath10k_thermal_get_max_throttle_state,
57 .get_cur_state = ath10k_thermal_get_cur_throttle_state,
58 .set_cur_state = ath10k_thermal_set_cur_throttle_state,
59 };
60
ath10k_thermal_show_temp(struct device * dev,struct device_attribute * attr,char * buf)61 static ssize_t ath10k_thermal_show_temp(struct device *dev,
62 struct device_attribute *attr,
63 char *buf)
64 {
65 struct ath10k *ar = dev_get_drvdata(dev);
66 int ret, temperature;
67 unsigned long time_left;
68
69 mutex_lock(&ar->conf_mutex);
70
71 /* Can't get temperature when the card is off */
72 if (ar->state != ATH10K_STATE_ON) {
73 ret = -ENETDOWN;
74 goto out;
75 }
76
77 reinit_completion(&ar->thermal.wmi_sync);
78 ret = ath10k_wmi_pdev_get_temperature(ar);
79 if (ret) {
80 ath10k_warn(ar, "failed to read temperature %d\n", ret);
81 goto out;
82 }
83
84 if (test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags)) {
85 ret = -ESHUTDOWN;
86 goto out;
87 }
88
89 time_left = wait_for_completion_timeout(&ar->thermal.wmi_sync,
90 ATH10K_THERMAL_SYNC_TIMEOUT_HZ);
91 if (!time_left) {
92 ath10k_warn(ar, "failed to synchronize thermal read\n");
93 ret = -ETIMEDOUT;
94 goto out;
95 }
96
97 spin_lock_bh(&ar->data_lock);
98 temperature = ar->thermal.temperature;
99 spin_unlock_bh(&ar->data_lock);
100
101 /* display in millidegree celsius */
102 ret = snprintf(buf, PAGE_SIZE, "%d\n", temperature * 1000);
103 out:
104 mutex_unlock(&ar->conf_mutex);
105 return ret;
106 }
107
ath10k_thermal_event_temperature(struct ath10k * ar,int temperature)108 void ath10k_thermal_event_temperature(struct ath10k *ar, int temperature)
109 {
110 spin_lock_bh(&ar->data_lock);
111 ar->thermal.temperature = temperature;
112 spin_unlock_bh(&ar->data_lock);
113 complete(&ar->thermal.wmi_sync);
114 }
115
116 static SENSOR_DEVICE_ATTR(temp1_input, 0444, ath10k_thermal_show_temp,
117 NULL, 0);
118
119 static struct attribute *ath10k_hwmon_attrs[] = {
120 &sensor_dev_attr_temp1_input.dev_attr.attr,
121 NULL,
122 };
123 ATTRIBUTE_GROUPS(ath10k_hwmon);
124
ath10k_thermal_set_throttling(struct ath10k * ar)125 void ath10k_thermal_set_throttling(struct ath10k *ar)
126 {
127 u32 period, duration, enabled;
128 int ret;
129
130 lockdep_assert_held(&ar->conf_mutex);
131
132 if (!test_bit(WMI_SERVICE_THERM_THROT, ar->wmi.svc_map))
133 return;
134
135 if (!ar->wmi.ops->gen_pdev_set_quiet_mode)
136 return;
137
138 if (ar->state != ATH10K_STATE_ON)
139 return;
140
141 period = ar->thermal.quiet_period;
142 duration = (period * ar->thermal.throttle_state) / 100;
143 enabled = duration ? 1 : 0;
144
145 ret = ath10k_wmi_pdev_set_quiet_mode(ar, period, duration,
146 ATH10K_QUIET_START_OFFSET,
147 enabled);
148 if (ret) {
149 ath10k_warn(ar, "failed to set quiet mode period %u duarion %u enabled %u ret %d\n",
150 period, duration, enabled, ret);
151 }
152 }
153
ath10k_thermal_register(struct ath10k * ar)154 int ath10k_thermal_register(struct ath10k *ar)
155 {
156 struct thermal_cooling_device *cdev;
157 struct device *hwmon_dev;
158 int ret;
159
160 if (!test_bit(WMI_SERVICE_THERM_THROT, ar->wmi.svc_map))
161 return 0;
162
163 cdev = thermal_cooling_device_register("ath10k_thermal", ar,
164 &ath10k_thermal_ops);
165
166 if (IS_ERR(cdev)) {
167 ath10k_err(ar, "failed to setup thermal device result: %ld\n",
168 PTR_ERR(cdev));
169 return -EINVAL;
170 }
171
172 ret = sysfs_create_link(&ar->dev->kobj, &cdev->device.kobj,
173 "cooling_device");
174 if (ret) {
175 ath10k_err(ar, "failed to create cooling device symlink\n");
176 goto err_cooling_destroy;
177 }
178
179 ar->thermal.cdev = cdev;
180 ar->thermal.quiet_period = ATH10K_QUIET_PERIOD_DEFAULT;
181
182 /* Do not register hwmon device when temperature reading is not
183 * supported by firmware
184 */
185 if (!(ar->wmi.ops->gen_pdev_get_temperature))
186 return 0;
187
188 /* Avoid linking error on devm_hwmon_device_register_with_groups, I
189 * guess linux/hwmon.h is missing proper stubs.
190 */
191 if (!IS_REACHABLE(CONFIG_HWMON))
192 return 0;
193
194 hwmon_dev = devm_hwmon_device_register_with_groups(ar->dev,
195 "ath10k_hwmon", ar,
196 ath10k_hwmon_groups);
197 if (IS_ERR(hwmon_dev)) {
198 ath10k_err(ar, "failed to register hwmon device: %ld\n",
199 PTR_ERR(hwmon_dev));
200 ret = -EINVAL;
201 goto err_remove_link;
202 }
203 return 0;
204
205 err_remove_link:
206 sysfs_remove_link(&ar->dev->kobj, "cooling_device");
207 err_cooling_destroy:
208 thermal_cooling_device_unregister(cdev);
209 return ret;
210 }
211
ath10k_thermal_unregister(struct ath10k * ar)212 void ath10k_thermal_unregister(struct ath10k *ar)
213 {
214 if (!test_bit(WMI_SERVICE_THERM_THROT, ar->wmi.svc_map))
215 return;
216
217 sysfs_remove_link(&ar->dev->kobj, "cooling_device");
218 thermal_cooling_device_unregister(ar->thermal.cdev);
219 }
220