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925c36bb SP |
1 | /* |
2 | * ACPI INT3403 thermal driver | |
3 | * Copyright (c) 2013, Intel Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | */ | |
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/acpi.h> | |
20 | #include <linux/thermal.h> | |
21 | ||
22 | #define INT3403_TYPE_SENSOR 0x03 | |
23 | #define INT3403_PERF_CHANGED_EVENT 0x80 | |
24 | #define INT3403_THERMAL_EVENT 0x90 | |
25 | ||
26 | #define DECI_KELVIN_TO_MILLI_CELSIUS(t, off) (((t) - (off)) * 100) | |
27 | #define KELVIN_OFFSET 2732 | |
28 | #define MILLI_CELSIUS_TO_DECI_KELVIN(t, off) (((t) / 100) + (off)) | |
29 | ||
30 | #define ACPI_INT3403_CLASS "int3403" | |
31 | #define ACPI_INT3403_FILE_STATE "state" | |
32 | ||
33 | struct int3403_sensor { | |
34 | struct thermal_zone_device *tzone; | |
35 | unsigned long *thresholds; | |
5fcdeb20 SP |
36 | unsigned long crit_temp; |
37 | int crit_trip_id; | |
38 | unsigned long psv_temp; | |
39 | int psv_trip_id; | |
925c36bb SP |
40 | }; |
41 | ||
42 | static int sys_get_curr_temp(struct thermal_zone_device *tzone, | |
43 | unsigned long *temp) | |
44 | { | |
45 | struct acpi_device *device = tzone->devdata; | |
46 | unsigned long long tmp; | |
47 | acpi_status status; | |
48 | ||
49 | status = acpi_evaluate_integer(device->handle, "_TMP", NULL, &tmp); | |
50 | if (ACPI_FAILURE(status)) | |
51 | return -EIO; | |
52 | ||
53 | *temp = DECI_KELVIN_TO_MILLI_CELSIUS(tmp, KELVIN_OFFSET); | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | static int sys_get_trip_hyst(struct thermal_zone_device *tzone, | |
59 | int trip, unsigned long *temp) | |
60 | { | |
61 | struct acpi_device *device = tzone->devdata; | |
62 | unsigned long long hyst; | |
63 | acpi_status status; | |
64 | ||
65 | status = acpi_evaluate_integer(device->handle, "GTSH", NULL, &hyst); | |
66 | if (ACPI_FAILURE(status)) | |
67 | return -EIO; | |
68 | ||
ced22843 T |
69 | /* |
70 | * Thermal hysteresis represents a temperature difference. | |
71 | * Kelvin and Celsius have same degree size. So the | |
72 | * conversion here between tenths of degree Kelvin unit | |
73 | * and Milli-Celsius unit is just to multiply 100. | |
74 | */ | |
75 | *temp = hyst * 100; | |
925c36bb SP |
76 | |
77 | return 0; | |
78 | } | |
79 | ||
80 | static int sys_get_trip_temp(struct thermal_zone_device *tzone, | |
81 | int trip, unsigned long *temp) | |
82 | { | |
83 | struct acpi_device *device = tzone->devdata; | |
84 | struct int3403_sensor *obj = acpi_driver_data(device); | |
85 | ||
5fcdeb20 SP |
86 | if (trip == obj->crit_trip_id) |
87 | *temp = obj->crit_temp; | |
88 | else if (trip == obj->psv_trip_id) | |
89 | *temp = obj->psv_temp; | |
90 | else { | |
91 | /* | |
92 | * get_trip_temp is a mandatory callback but | |
93 | * PATx method doesn't return any value, so return | |
94 | * cached value, which was last set from user space. | |
95 | */ | |
96 | *temp = obj->thresholds[trip]; | |
97 | } | |
925c36bb SP |
98 | |
99 | return 0; | |
100 | } | |
101 | ||
102 | static int sys_get_trip_type(struct thermal_zone_device *thermal, | |
103 | int trip, enum thermal_trip_type *type) | |
104 | { | |
5fcdeb20 SP |
105 | struct acpi_device *device = thermal->devdata; |
106 | struct int3403_sensor *obj = acpi_driver_data(device); | |
107 | ||
925c36bb | 108 | /* Mandatory callback, may not mean much here */ |
5fcdeb20 SP |
109 | if (trip == obj->crit_trip_id) |
110 | *type = THERMAL_TRIP_CRITICAL; | |
111 | else | |
112 | *type = THERMAL_TRIP_PASSIVE; | |
925c36bb SP |
113 | |
114 | return 0; | |
115 | } | |
116 | ||
117 | int sys_set_trip_temp(struct thermal_zone_device *tzone, int trip, | |
118 | unsigned long temp) | |
119 | { | |
120 | struct acpi_device *device = tzone->devdata; | |
121 | acpi_status status; | |
122 | char name[10]; | |
123 | int ret = 0; | |
124 | struct int3403_sensor *obj = acpi_driver_data(device); | |
125 | ||
126 | snprintf(name, sizeof(name), "PAT%d", trip); | |
127 | if (acpi_has_method(device->handle, name)) { | |
128 | status = acpi_execute_simple_method(device->handle, name, | |
129 | MILLI_CELSIUS_TO_DECI_KELVIN(temp, | |
130 | KELVIN_OFFSET)); | |
131 | if (ACPI_FAILURE(status)) | |
132 | ret = -EIO; | |
133 | else | |
134 | obj->thresholds[trip] = temp; | |
135 | } else { | |
136 | ret = -EIO; | |
137 | dev_err(&device->dev, "sys_set_trip_temp: method not found\n"); | |
138 | } | |
139 | ||
140 | return ret; | |
141 | } | |
142 | ||
143 | static struct thermal_zone_device_ops tzone_ops = { | |
144 | .get_temp = sys_get_curr_temp, | |
145 | .get_trip_temp = sys_get_trip_temp, | |
146 | .get_trip_type = sys_get_trip_type, | |
147 | .set_trip_temp = sys_set_trip_temp, | |
148 | .get_trip_hyst = sys_get_trip_hyst, | |
149 | }; | |
150 | ||
151 | static void acpi_thermal_notify(struct acpi_device *device, u32 event) | |
152 | { | |
153 | struct int3403_sensor *obj; | |
154 | ||
155 | if (!device) | |
156 | return; | |
157 | ||
158 | obj = acpi_driver_data(device); | |
159 | if (!obj) | |
160 | return; | |
161 | ||
162 | switch (event) { | |
163 | case INT3403_PERF_CHANGED_EVENT: | |
164 | break; | |
165 | case INT3403_THERMAL_EVENT: | |
166 | thermal_zone_device_update(obj->tzone); | |
167 | break; | |
168 | default: | |
169 | dev_err(&device->dev, "Unsupported event [0x%x]\n", event); | |
170 | break; | |
171 | } | |
172 | } | |
173 | ||
5fcdeb20 SP |
174 | static int sys_get_trip_crt(struct acpi_device *device, unsigned long *temp) |
175 | { | |
176 | unsigned long long crt; | |
177 | acpi_status status; | |
178 | ||
179 | status = acpi_evaluate_integer(device->handle, "_CRT", NULL, &crt); | |
180 | if (ACPI_FAILURE(status)) | |
181 | return -EIO; | |
182 | ||
183 | *temp = DECI_KELVIN_TO_MILLI_CELSIUS(crt, KELVIN_OFFSET); | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | static int sys_get_trip_psv(struct acpi_device *device, unsigned long *temp) | |
189 | { | |
190 | unsigned long long psv; | |
191 | acpi_status status; | |
192 | ||
193 | status = acpi_evaluate_integer(device->handle, "_PSV", NULL, &psv); | |
194 | if (ACPI_FAILURE(status)) | |
195 | return -EIO; | |
196 | ||
197 | *temp = DECI_KELVIN_TO_MILLI_CELSIUS(psv, KELVIN_OFFSET); | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
925c36bb SP |
202 | static int acpi_int3403_add(struct acpi_device *device) |
203 | { | |
204 | int result = 0; | |
205 | unsigned long long ptyp; | |
206 | acpi_status status; | |
207 | struct int3403_sensor *obj; | |
208 | unsigned long long trip_cnt; | |
209 | int trip_mask = 0; | |
210 | ||
211 | if (!device) | |
212 | return -EINVAL; | |
213 | ||
214 | status = acpi_evaluate_integer(device->handle, "PTYP", NULL, &ptyp); | |
215 | if (ACPI_FAILURE(status)) | |
216 | return -EINVAL; | |
217 | ||
218 | if (ptyp != INT3403_TYPE_SENSOR) | |
219 | return -EINVAL; | |
220 | ||
221 | obj = devm_kzalloc(&device->dev, sizeof(*obj), GFP_KERNEL); | |
222 | if (!obj) | |
223 | return -ENOMEM; | |
224 | ||
225 | device->driver_data = obj; | |
226 | ||
227 | status = acpi_evaluate_integer(device->handle, "PATC", NULL, | |
228 | &trip_cnt); | |
229 | if (ACPI_FAILURE(status)) | |
230 | trip_cnt = 0; | |
231 | ||
232 | if (trip_cnt) { | |
233 | /* We have to cache, thresholds can't be readback */ | |
234 | obj->thresholds = devm_kzalloc(&device->dev, | |
235 | sizeof(*obj->thresholds) * trip_cnt, | |
236 | GFP_KERNEL); | |
237 | if (!obj->thresholds) | |
238 | return -ENOMEM; | |
239 | trip_mask = BIT(trip_cnt) - 1; | |
240 | } | |
5fcdeb20 SP |
241 | |
242 | obj->psv_trip_id = -1; | |
243 | if (!sys_get_trip_psv(device, &obj->psv_temp)) | |
244 | obj->psv_trip_id = trip_cnt++; | |
245 | ||
246 | obj->crit_trip_id = -1; | |
247 | if (!sys_get_trip_crt(device, &obj->crit_temp)) | |
248 | obj->crit_trip_id = trip_cnt++; | |
249 | ||
925c36bb SP |
250 | obj->tzone = thermal_zone_device_register(acpi_device_bid(device), |
251 | trip_cnt, trip_mask, device, &tzone_ops, | |
252 | NULL, 0, 0); | |
253 | if (IS_ERR(obj->tzone)) { | |
254 | result = PTR_ERR(obj->tzone); | |
255 | return result; | |
256 | } | |
257 | ||
258 | strcpy(acpi_device_name(device), "INT3403"); | |
259 | strcpy(acpi_device_class(device), ACPI_INT3403_CLASS); | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
264 | static int acpi_int3403_remove(struct acpi_device *device) | |
265 | { | |
266 | struct int3403_sensor *obj; | |
267 | ||
268 | obj = acpi_driver_data(device); | |
269 | thermal_zone_device_unregister(obj->tzone); | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
274 | ACPI_MODULE_NAME("int3403"); | |
275 | static const struct acpi_device_id int3403_device_ids[] = { | |
276 | {"INT3403", 0}, | |
277 | {"", 0}, | |
278 | }; | |
279 | MODULE_DEVICE_TABLE(acpi, int3403_device_ids); | |
280 | ||
281 | static struct acpi_driver acpi_int3403_driver = { | |
282 | .name = "INT3403", | |
283 | .class = ACPI_INT3403_CLASS, | |
284 | .ids = int3403_device_ids, | |
285 | .ops = { | |
286 | .add = acpi_int3403_add, | |
287 | .remove = acpi_int3403_remove, | |
288 | .notify = acpi_thermal_notify, | |
289 | }, | |
290 | }; | |
291 | ||
292 | module_acpi_driver(acpi_int3403_driver); | |
293 | ||
294 | MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); | |
295 | MODULE_LICENSE("GPL v2"); | |
296 | MODULE_DESCRIPTION("ACPI INT3403 thermal driver"); |