summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/ath/ath10k/thermal.c
blob: fe35edcd3ec8104005310f5c831218493d990754 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
/*
 * Copyright (c) 2014-2015 Qualcomm Atheros, Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/device.h>
#include <linux/sysfs.h>
#include <linux/thermal.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include "core.h"
#include "debug.h"
#include "wmi-ops.h"

static int
ath10k_thermal_get_max_throttle_state(struct thermal_cooling_device *cdev,
				      unsigned long *state)
{
	*state = ATH10K_THERMAL_THROTTLE_MAX;

	return 0;
}

static int
ath10k_thermal_get_cur_throttle_state(struct thermal_cooling_device *cdev,
				      unsigned long *state)
{
	struct ath10k *ar = cdev->devdata;

	mutex_lock(&ar->conf_mutex);
	*state = ar->thermal.throttle_state;
	mutex_unlock(&ar->conf_mutex);

	return 0;
}

static int
ath10k_thermal_set_cur_throttle_state(struct thermal_cooling_device *cdev,
				      unsigned long throttle_state)
{
	struct ath10k *ar = cdev->devdata;

	if (throttle_state > ATH10K_THERMAL_THROTTLE_MAX) {
		ath10k_warn(ar, "throttle state %ld is exceeding the limit %d\n",
			    throttle_state, ATH10K_THERMAL_THROTTLE_MAX);
		return -EINVAL;
	}
	mutex_lock(&ar->conf_mutex);
	ar->thermal.throttle_state = throttle_state;
	ath10k_thermal_set_throttling(ar);
	mutex_unlock(&ar->conf_mutex);
	return 0;
}

static const struct thermal_cooling_device_ops ath10k_thermal_ops = {
	.get_max_state = ath10k_thermal_get_max_throttle_state,
	.get_cur_state = ath10k_thermal_get_cur_throttle_state,
	.set_cur_state = ath10k_thermal_set_cur_throttle_state,
};

static ssize_t ath10k_thermal_show_temp(struct device *dev,
					struct device_attribute *attr,
					char *buf)
{
	struct ath10k *ar = dev_get_drvdata(dev);
	int ret, temperature;
	unsigned long time_left;

	mutex_lock(&ar->conf_mutex);

	/* Can't get temperature when the card is off */
	if (ar->state != ATH10K_STATE_ON) {
		ret = -ENETDOWN;
		goto out;
	}

	reinit_completion(&ar->thermal.wmi_sync);
	ret = ath10k_wmi_pdev_get_temperature(ar);
	if (ret) {
		ath10k_warn(ar, "failed to read temperature %d\n", ret);
		goto out;
	}

	if (test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags)) {
		ret = -ESHUTDOWN;
		goto out;
	}

	time_left = wait_for_completion_timeout(&ar->thermal.wmi_sync,
						ATH10K_THERMAL_SYNC_TIMEOUT_HZ);
	if (!time_left) {
		ath10k_warn(ar, "failed to synchronize thermal read\n");
		ret = -ETIMEDOUT;
		goto out;
	}

	spin_lock_bh(&ar->data_lock);
	temperature = ar->thermal.temperature;
	spin_unlock_bh(&ar->data_lock);

	/* display in millidegree celcius */
	ret = snprintf(buf, PAGE_SIZE, "%d\n", temperature * 1000);
out:
	mutex_unlock(&ar->conf_mutex);
	return ret;
}

void ath10k_thermal_event_temperature(struct ath10k *ar, int temperature)
{
	spin_lock_bh(&ar->data_lock);
	ar->thermal.temperature = temperature;
	spin_unlock_bh(&ar->data_lock);
	complete(&ar->thermal.wmi_sync);
}

static SENSOR_DEVICE_ATTR(temp1_input, 0444, ath10k_thermal_show_temp,
			  NULL, 0);

static struct attribute *ath10k_hwmon_attrs[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	NULL,
};
ATTRIBUTE_GROUPS(ath10k_hwmon);

void ath10k_thermal_set_throttling(struct ath10k *ar)
{
	u32 period, duration, enabled;
	int ret;

	lockdep_assert_held(&ar->conf_mutex);

	if (!test_bit(WMI_SERVICE_THERM_THROT, ar->wmi.svc_map))
		return;

	if (!ar->wmi.ops->gen_pdev_set_quiet_mode)
		return;

	if (ar->state != ATH10K_STATE_ON)
		return;

	period = ar->thermal.quiet_period;
	duration = (period * ar->thermal.throttle_state) / 100;
	enabled = duration ? 1 : 0;

	ret = ath10k_wmi_pdev_set_quiet_mode(ar, period, duration,
					     ATH10K_QUIET_START_OFFSET,
					     enabled);
	if (ret) {
		ath10k_warn(ar, "failed to set quiet mode period %u duarion %u enabled %u ret %d\n",
			    period, duration, enabled, ret);
	}
}

int ath10k_thermal_register(struct ath10k *ar)
{
	struct thermal_cooling_device *cdev;
	struct device *hwmon_dev;
	int ret;

	if (!test_bit(WMI_SERVICE_THERM_THROT, ar->wmi.svc_map))
		return 0;

	cdev = thermal_cooling_device_register("ath10k_thermal", ar,
					       &ath10k_thermal_ops);

	if (IS_ERR(cdev)) {
		ath10k_err(ar, "failed to setup thermal device result: %ld\n",
			   PTR_ERR(cdev));
		return -EINVAL;
	}

	ret = sysfs_create_link(&ar->dev->kobj, &cdev->device.kobj,
				"cooling_device");
	if (ret) {
		ath10k_err(ar, "failed to create cooling device symlink\n");
		goto err_cooling_destroy;
	}

	ar->thermal.cdev = cdev;
	ar->thermal.quiet_period = ATH10K_QUIET_PERIOD_DEFAULT;

	/* Do not register hwmon device when temperature reading is not
	 * supported by firmware
	 */
	if (!(ar->wmi.ops->gen_pdev_get_temperature))
		return 0;

	/* Avoid linking error on devm_hwmon_device_register_with_groups, I
	 * guess linux/hwmon.h is missing proper stubs.
	 */
	if (!IS_REACHABLE(CONFIG_HWMON))
		return 0;

	hwmon_dev = devm_hwmon_device_register_with_groups(ar->dev,
							   "ath10k_hwmon", ar,
							   ath10k_hwmon_groups);
	if (IS_ERR(hwmon_dev)) {
		ath10k_err(ar, "failed to register hwmon device: %ld\n",
			   PTR_ERR(hwmon_dev));
		ret = -EINVAL;
		goto err_remove_link;
	}
	return 0;

err_remove_link:
	sysfs_remove_link(&ar->dev->kobj, "cooling_device");
err_cooling_destroy:
	thermal_cooling_device_unregister(cdev);
	return ret;
}

void ath10k_thermal_unregister(struct ath10k *ar)
{
	if (!test_bit(WMI_SERVICE_THERM_THROT, ar->wmi.svc_map))
		return;

	sysfs_remove_link(&ar->dev->kobj, "cooling_device");
	thermal_cooling_device_unregister(ar->thermal.cdev);
}