1 /*
2  * Copyright (c) 2014-2015 Qualcomm Atheros, Inc.
3  *
4  * Permission to use, copy, modify, and/or distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <linux/device.h>
18 #include <linux/sysfs.h>
19 #include <linux/thermal.h>
20 #include <linux/hwmon.h>
21 #include <linux/hwmon-sysfs.h>
22 #include "core.h"
23 #include "debug.h"
24 #include "wmi-ops.h"
25 
26 static int
27 ath10k_thermal_get_max_throttle_state(struct thermal_cooling_device *cdev,
28 				      unsigned long *state)
29 {
30 	*state = ATH10K_THERMAL_THROTTLE_MAX;
31 
32 	return 0;
33 }
34 
35 static int
36 ath10k_thermal_get_cur_throttle_state(struct thermal_cooling_device *cdev,
37 				      unsigned long *state)
38 {
39 	struct ath10k *ar = cdev->devdata;
40 
41 	mutex_lock(&ar->conf_mutex);
42 	*state = ar->thermal.throttle_state;
43 	mutex_unlock(&ar->conf_mutex);
44 
45 	return 0;
46 }
47 
48 static int
49 ath10k_thermal_set_cur_throttle_state(struct thermal_cooling_device *cdev,
50 				      unsigned long throttle_state)
51 {
52 	struct ath10k *ar = cdev->devdata;
53 
54 	if (throttle_state > ATH10K_THERMAL_THROTTLE_MAX) {
55 		ath10k_warn(ar, "throttle state %ld is exceeding the limit %d\n",
56 			    throttle_state, ATH10K_THERMAL_THROTTLE_MAX);
57 		return -EINVAL;
58 	}
59 	mutex_lock(&ar->conf_mutex);
60 	ar->thermal.throttle_state = throttle_state;
61 	ath10k_thermal_set_throttling(ar);
62 	mutex_unlock(&ar->conf_mutex);
63 	return 0;
64 }
65 
66 static const struct thermal_cooling_device_ops ath10k_thermal_ops = {
67 	.get_max_state = ath10k_thermal_get_max_throttle_state,
68 	.get_cur_state = ath10k_thermal_get_cur_throttle_state,
69 	.set_cur_state = ath10k_thermal_set_cur_throttle_state,
70 };
71 
72 static ssize_t ath10k_thermal_show_temp(struct device *dev,
73 					struct device_attribute *attr,
74 					char *buf)
75 {
76 	struct ath10k *ar = dev_get_drvdata(dev);
77 	int ret, temperature;
78 	unsigned long time_left;
79 
80 	mutex_lock(&ar->conf_mutex);
81 
82 	/* Can't get temperature when the card is off */
83 	if (ar->state != ATH10K_STATE_ON) {
84 		ret = -ENETDOWN;
85 		goto out;
86 	}
87 
88 	reinit_completion(&ar->thermal.wmi_sync);
89 	ret = ath10k_wmi_pdev_get_temperature(ar);
90 	if (ret) {
91 		ath10k_warn(ar, "failed to read temperature %d\n", ret);
92 		goto out;
93 	}
94 
95 	if (test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags)) {
96 		ret = -ESHUTDOWN;
97 		goto out;
98 	}
99 
100 	time_left = wait_for_completion_timeout(&ar->thermal.wmi_sync,
101 						ATH10K_THERMAL_SYNC_TIMEOUT_HZ);
102 	if (!time_left) {
103 		ath10k_warn(ar, "failed to synchronize thermal read\n");
104 		ret = -ETIMEDOUT;
105 		goto out;
106 	}
107 
108 	spin_lock_bh(&ar->data_lock);
109 	temperature = ar->thermal.temperature;
110 	spin_unlock_bh(&ar->data_lock);
111 
112 	/* display in millidegree celcius */
113 	ret = snprintf(buf, PAGE_SIZE, "%d\n", temperature * 1000);
114 out:
115 	mutex_unlock(&ar->conf_mutex);
116 	return ret;
117 }
118 
119 void ath10k_thermal_event_temperature(struct ath10k *ar, int temperature)
120 {
121 	spin_lock_bh(&ar->data_lock);
122 	ar->thermal.temperature = temperature;
123 	spin_unlock_bh(&ar->data_lock);
124 	complete(&ar->thermal.wmi_sync);
125 }
126 
127 static SENSOR_DEVICE_ATTR(temp1_input, 0444, ath10k_thermal_show_temp,
128 			  NULL, 0);
129 
130 static struct attribute *ath10k_hwmon_attrs[] = {
131 	&sensor_dev_attr_temp1_input.dev_attr.attr,
132 	NULL,
133 };
134 ATTRIBUTE_GROUPS(ath10k_hwmon);
135 
136 void ath10k_thermal_set_throttling(struct ath10k *ar)
137 {
138 	u32 period, duration, enabled;
139 	int ret;
140 
141 	lockdep_assert_held(&ar->conf_mutex);
142 
143 	if (!ar->wmi.ops->gen_pdev_set_quiet_mode)
144 		return;
145 
146 	if (ar->state != ATH10K_STATE_ON)
147 		return;
148 
149 	period = ar->thermal.quiet_period;
150 	duration = (period * ar->thermal.throttle_state) / 100;
151 	enabled = duration ? 1 : 0;
152 
153 	ret = ath10k_wmi_pdev_set_quiet_mode(ar, period, duration,
154 					     ATH10K_QUIET_START_OFFSET,
155 					     enabled);
156 	if (ret) {
157 		ath10k_warn(ar, "failed to set quiet mode period %u duarion %u enabled %u ret %d\n",
158 			    period, duration, enabled, ret);
159 	}
160 }
161 
162 int ath10k_thermal_register(struct ath10k *ar)
163 {
164 	struct thermal_cooling_device *cdev;
165 	struct device *hwmon_dev;
166 	int ret;
167 
168 	cdev = thermal_cooling_device_register("ath10k_thermal", ar,
169 					       &ath10k_thermal_ops);
170 
171 	if (IS_ERR(cdev)) {
172 		ath10k_err(ar, "failed to setup thermal device result: %ld\n",
173 			   PTR_ERR(cdev));
174 		return -EINVAL;
175 	}
176 
177 	ret = sysfs_create_link(&ar->dev->kobj, &cdev->device.kobj,
178 				"cooling_device");
179 	if (ret) {
180 		ath10k_err(ar, "failed to create cooling device symlink\n");
181 		goto err_cooling_destroy;
182 	}
183 
184 	ar->thermal.cdev = cdev;
185 	ar->thermal.quiet_period = ATH10K_QUIET_PERIOD_DEFAULT;
186 
187 	/* Do not register hwmon device when temperature reading is not
188 	 * supported by firmware
189 	 */
190 	if (!(ar->wmi.ops->gen_pdev_get_temperature))
191 		return 0;
192 
193 	/* Avoid linking error on devm_hwmon_device_register_with_groups, I
194 	 * guess linux/hwmon.h is missing proper stubs.
195 	 */
196 	if (!IS_REACHABLE(CONFIG_HWMON))
197 		return 0;
198 
199 	hwmon_dev = devm_hwmon_device_register_with_groups(ar->dev,
200 							   "ath10k_hwmon", ar,
201 							   ath10k_hwmon_groups);
202 	if (IS_ERR(hwmon_dev)) {
203 		ath10k_err(ar, "failed to register hwmon device: %ld\n",
204 			   PTR_ERR(hwmon_dev));
205 		ret = -EINVAL;
206 		goto err_remove_link;
207 	}
208 	return 0;
209 
210 err_remove_link:
211 	sysfs_remove_link(&ar->dev->kobj, "cooling_device");
212 err_cooling_destroy:
213 	thermal_cooling_device_unregister(cdev);
214 	return ret;
215 }
216 
217 void ath10k_thermal_unregister(struct ath10k *ar)
218 {
219 	sysfs_remove_link(&ar->dev->kobj, "cooling_device");
220 	thermal_cooling_device_unregister(ar->thermal.cdev);
221 }
222