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77e337c6 AL |
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
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", | |
77e337c6 AL |
234 | .acpi_match_table = int3402_thermal_match, |
235 | }, | |
236 | }; | |
237 | ||
238 | module_platform_driver(int3402_thermal_driver); | |
239 | ||
240 | MODULE_DESCRIPTION("INT3402 Thermal driver"); | |
241 | MODULE_LICENSE("GPL"); |