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
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
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
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 
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 
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 
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(&param, 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, &param);
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 
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 
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