1 /*
2 * INT3402 thermal driver for memory temperature reporting
3 *
4 * Copyright (C) 2014, Intel Corporation
5 * Authors: Aaron Lu <aaron.lu@intel.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/acpi.h>
16 #include <linux/thermal.h>
17
18 #define ACPI_ACTIVE_COOLING_MAX_NR 10
19
20 struct active_trip {
21 unsigned long temp;
22 int id;
23 bool valid;
24 };
25
26 struct int3402_thermal_data {
27 unsigned long *aux_trips;
28 int aux_trip_nr;
29 unsigned long psv_temp;
30 int psv_trip_id;
31 unsigned long crt_temp;
32 int crt_trip_id;
33 unsigned long hot_temp;
34 int hot_trip_id;
35 struct active_trip act_trips[ACPI_ACTIVE_COOLING_MAX_NR];
36 acpi_handle *handle;
37 };
38
int3402_thermal_get_zone_temp(struct thermal_zone_device * zone,unsigned long * temp)39 static int int3402_thermal_get_zone_temp(struct thermal_zone_device *zone,
40 unsigned long *temp)
41 {
42 struct int3402_thermal_data *d = zone->devdata;
43 unsigned long long tmp;
44 acpi_status status;
45
46 status = acpi_evaluate_integer(d->handle, "_TMP", NULL, &tmp);
47 if (ACPI_FAILURE(status))
48 return -ENODEV;
49
50 /* _TMP returns the temperature in tenths of degrees Kelvin */
51 *temp = DECI_KELVIN_TO_MILLICELSIUS(tmp);
52
53 return 0;
54 }
55
int3402_thermal_get_trip_temp(struct thermal_zone_device * zone,int trip,unsigned long * temp)56 static int int3402_thermal_get_trip_temp(struct thermal_zone_device *zone,
57 int trip, unsigned long *temp)
58 {
59 struct int3402_thermal_data *d = zone->devdata;
60 int i;
61
62 if (trip < d->aux_trip_nr)
63 *temp = d->aux_trips[trip];
64 else if (trip == d->crt_trip_id)
65 *temp = d->crt_temp;
66 else if (trip == d->psv_trip_id)
67 *temp = d->psv_temp;
68 else if (trip == d->hot_trip_id)
69 *temp = d->hot_temp;
70 else {
71 for (i = 0; i < ACPI_ACTIVE_COOLING_MAX_NR; i++) {
72 if (d->act_trips[i].valid &&
73 d->act_trips[i].id == trip) {
74 *temp = d->act_trips[i].temp;
75 break;
76 }
77 }
78 if (i == ACPI_ACTIVE_COOLING_MAX_NR)
79 return -EINVAL;
80 }
81 return 0;
82 }
83
int3402_thermal_get_trip_type(struct thermal_zone_device * zone,int trip,enum thermal_trip_type * type)84 static int int3402_thermal_get_trip_type(struct thermal_zone_device *zone,
85 int trip, enum thermal_trip_type *type)
86 {
87 struct int3402_thermal_data *d = zone->devdata;
88 int i;
89
90 if (trip < d->aux_trip_nr)
91 *type = THERMAL_TRIP_PASSIVE;
92 else if (trip == d->crt_trip_id)
93 *type = THERMAL_TRIP_CRITICAL;
94 else if (trip == d->hot_trip_id)
95 *type = THERMAL_TRIP_HOT;
96 else if (trip == d->psv_trip_id)
97 *type = THERMAL_TRIP_PASSIVE;
98 else {
99 for (i = 0; i < ACPI_ACTIVE_COOLING_MAX_NR; i++) {
100 if (d->act_trips[i].valid &&
101 d->act_trips[i].id == trip) {
102 *type = THERMAL_TRIP_ACTIVE;
103 break;
104 }
105 }
106 if (i == ACPI_ACTIVE_COOLING_MAX_NR)
107 return -EINVAL;
108 }
109 return 0;
110 }
111
int3402_thermal_set_trip_temp(struct thermal_zone_device * zone,int trip,unsigned long temp)112 static int int3402_thermal_set_trip_temp(struct thermal_zone_device *zone, int trip,
113 unsigned long temp)
114 {
115 struct int3402_thermal_data *d = zone->devdata;
116 acpi_status status;
117 char name[10];
118
119 snprintf(name, sizeof(name), "PAT%d", trip);
120 status = acpi_execute_simple_method(d->handle, name,
121 MILLICELSIUS_TO_DECI_KELVIN(temp));
122 if (ACPI_FAILURE(status))
123 return -EIO;
124
125 d->aux_trips[trip] = temp;
126 return 0;
127 }
128
129 static struct thermal_zone_device_ops int3402_thermal_zone_ops = {
130 .get_temp = int3402_thermal_get_zone_temp,
131 .get_trip_temp = int3402_thermal_get_trip_temp,
132 .get_trip_type = int3402_thermal_get_trip_type,
133 .set_trip_temp = int3402_thermal_set_trip_temp,
134 };
135
136 static struct thermal_zone_params int3402_thermal_params = {
137 .governor_name = "user_space",
138 .no_hwmon = true,
139 };
140
int3402_thermal_get_temp(acpi_handle handle,char * name,unsigned long * temp)141 static int int3402_thermal_get_temp(acpi_handle handle, char *name,
142 unsigned long *temp)
143 {
144 unsigned long long r;
145 acpi_status status;
146
147 status = acpi_evaluate_integer(handle, name, NULL, &r);
148 if (ACPI_FAILURE(status))
149 return -EIO;
150
151 *temp = DECI_KELVIN_TO_MILLICELSIUS(r);
152 return 0;
153 }
154
int3402_thermal_probe(struct platform_device * pdev)155 static int int3402_thermal_probe(struct platform_device *pdev)
156 {
157 struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
158 struct int3402_thermal_data *d;
159 struct thermal_zone_device *zone;
160 acpi_status status;
161 unsigned long long trip_cnt;
162 int trip_mask = 0, i;
163
164 if (!acpi_has_method(adev->handle, "_TMP"))
165 return -ENODEV;
166
167 d = devm_kzalloc(&pdev->dev, sizeof(*d), GFP_KERNEL);
168 if (!d)
169 return -ENOMEM;
170
171 status = acpi_evaluate_integer(adev->handle, "PATC", NULL, &trip_cnt);
172 if (ACPI_FAILURE(status))
173 trip_cnt = 0;
174 else {
175 d->aux_trips = devm_kzalloc(&pdev->dev,
176 sizeof(*d->aux_trips) * trip_cnt, GFP_KERNEL);
177 if (!d->aux_trips)
178 return -ENOMEM;
179 trip_mask = trip_cnt - 1;
180 d->handle = adev->handle;
181 d->aux_trip_nr = trip_cnt;
182 }
183
184 d->crt_trip_id = -1;
185 if (!int3402_thermal_get_temp(adev->handle, "_CRT", &d->crt_temp))
186 d->crt_trip_id = trip_cnt++;
187 d->hot_trip_id = -1;
188 if (!int3402_thermal_get_temp(adev->handle, "_HOT", &d->hot_temp))
189 d->hot_trip_id = trip_cnt++;
190 d->psv_trip_id = -1;
191 if (!int3402_thermal_get_temp(adev->handle, "_PSV", &d->psv_temp))
192 d->psv_trip_id = trip_cnt++;
193 for (i = 0; i < ACPI_ACTIVE_COOLING_MAX_NR; i++) {
194 char name[5] = { '_', 'A', 'C', '0' + i, '\0' };
195 if (int3402_thermal_get_temp(adev->handle, name,
196 &d->act_trips[i].temp))
197 break;
198 d->act_trips[i].id = trip_cnt++;
199 d->act_trips[i].valid = true;
200 }
201
202 zone = thermal_zone_device_register(acpi_device_bid(adev), trip_cnt,
203 trip_mask, d,
204 &int3402_thermal_zone_ops,
205 &int3402_thermal_params,
206 0, 0);
207 if (IS_ERR(zone))
208 return PTR_ERR(zone);
209 platform_set_drvdata(pdev, zone);
210
211 return 0;
212 }
213
int3402_thermal_remove(struct platform_device * pdev)214 static int int3402_thermal_remove(struct platform_device *pdev)
215 {
216 struct thermal_zone_device *zone = platform_get_drvdata(pdev);
217
218 thermal_zone_device_unregister(zone);
219 return 0;
220 }
221
222 static const struct acpi_device_id int3402_thermal_match[] = {
223 {"INT3402", 0},
224 {}
225 };
226
227 MODULE_DEVICE_TABLE(acpi, int3402_thermal_match);
228
229 static struct platform_driver int3402_thermal_driver = {
230 .probe = int3402_thermal_probe,
231 .remove = int3402_thermal_remove,
232 .driver = {
233 .name = "int3402 thermal",
234 .owner = THIS_MODULE,
235 .acpi_match_table = int3402_thermal_match,
236 },
237 };
238
239 module_platform_driver(int3402_thermal_driver);
240
241 MODULE_DESCRIPTION("INT3402 Thermal driver");
242 MODULE_LICENSE("GPL");
243