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445eaf87 EV |
1 | /* |
2 | * OMAP thermal driver interface | |
3 | * | |
4 | * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ | |
5 | * Contact: | |
6 | * Eduardo Valentin <eduardo.valentin@ti.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * version 2 as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
20 | * 02110-1301 USA | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <linux/device.h> | |
25 | #include <linux/err.h> | |
26 | #include <linux/mutex.h> | |
27 | #include <linux/gfp.h> | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/workqueue.h> | |
30 | #include <linux/thermal.h> | |
31 | #include <linux/cpufreq.h> | |
5035d48d | 32 | #include <linux/cpumask.h> |
445eaf87 EV |
33 | #include <linux/cpu_cooling.h> |
34 | ||
7372add4 EV |
35 | #include "ti-thermal.h" |
36 | #include "ti-bandgap.h" | |
445eaf87 EV |
37 | |
38 | /* common data structures */ | |
03e859d3 EV |
39 | struct ti_thermal_data { |
40 | struct thermal_zone_device *ti_thermal; | |
359836e1 | 41 | struct thermal_zone_device *pcb_tz; |
445eaf87 | 42 | struct thermal_cooling_device *cool_dev; |
03e859d3 | 43 | struct ti_bandgap *bgp; |
445eaf87 EV |
44 | enum thermal_device_mode mode; |
45 | struct work_struct thermal_wq; | |
46 | int sensor_id; | |
47 | }; | |
48 | ||
03e859d3 | 49 | static void ti_thermal_work(struct work_struct *work) |
445eaf87 | 50 | { |
03e859d3 EV |
51 | struct ti_thermal_data *data = container_of(work, |
52 | struct ti_thermal_data, thermal_wq); | |
445eaf87 | 53 | |
03e859d3 | 54 | thermal_zone_device_update(data->ti_thermal); |
445eaf87 | 55 | |
03e859d3 EV |
56 | dev_dbg(&data->ti_thermal->device, "updated thermal zone %s\n", |
57 | data->ti_thermal->type); | |
445eaf87 EV |
58 | } |
59 | ||
60 | /** | |
03e859d3 | 61 | * ti_thermal_hotspot_temperature - returns sensor extrapolated temperature |
445eaf87 EV |
62 | * @t: omap sensor temperature |
63 | * @s: omap sensor slope value | |
64 | * @c: omap sensor const value | |
65 | */ | |
03e859d3 | 66 | static inline int ti_thermal_hotspot_temperature(int t, int s, int c) |
445eaf87 EV |
67 | { |
68 | int delta = t * s / 1000 + c; | |
69 | ||
70 | if (delta < 0) | |
71 | delta = 0; | |
72 | ||
73 | return t + delta; | |
74 | } | |
75 | ||
76 | /* thermal zone ops */ | |
77 | /* Get temperature callback function for thermal zone*/ | |
03e859d3 EV |
78 | static inline int ti_thermal_get_temp(struct thermal_zone_device *thermal, |
79 | unsigned long *temp) | |
445eaf87 | 80 | { |
359836e1 | 81 | struct thermal_zone_device *pcb_tz = NULL; |
03e859d3 EV |
82 | struct ti_thermal_data *data = thermal->devdata; |
83 | struct ti_bandgap *bgp; | |
9879b2c4 | 84 | const struct ti_temp_sensor *s; |
359836e1 EV |
85 | int ret, tmp, slope, constant; |
86 | unsigned long pcb_temp; | |
445eaf87 | 87 | |
04a4d10d EV |
88 | if (!data) |
89 | return 0; | |
90 | ||
d7f080e6 EV |
91 | bgp = data->bgp; |
92 | s = &bgp->conf->sensors[data->sensor_id]; | |
04a4d10d | 93 | |
03e859d3 | 94 | ret = ti_bandgap_read_temperature(bgp, data->sensor_id, &tmp); |
445eaf87 EV |
95 | if (ret) |
96 | return ret; | |
97 | ||
359836e1 EV |
98 | /* Default constants */ |
99 | slope = s->slope; | |
100 | constant = s->constant; | |
101 | ||
102 | pcb_tz = data->pcb_tz; | |
445eaf87 | 103 | /* In case pcb zone is available, use the extrapolation rule with it */ |
0c12b5ac | 104 | if (!IS_ERR(pcb_tz)) { |
359836e1 EV |
105 | ret = thermal_zone_get_temp(pcb_tz, &pcb_temp); |
106 | if (!ret) { | |
107 | tmp -= pcb_temp; /* got a valid PCB temp */ | |
108 | slope = s->slope_pcb; | |
109 | constant = s->constant_pcb; | |
110 | } else { | |
111 | dev_err(bgp->dev, | |
112 | "Failed to read PCB state. Using defaults\n"); | |
df8f1347 | 113 | ret = 0; |
359836e1 | 114 | } |
445eaf87 | 115 | } |
03e859d3 | 116 | *temp = ti_thermal_hotspot_temperature(tmp, slope, constant); |
445eaf87 EV |
117 | |
118 | return ret; | |
119 | } | |
120 | ||
121 | /* Bind callback functions for thermal zone */ | |
03e859d3 EV |
122 | static int ti_thermal_bind(struct thermal_zone_device *thermal, |
123 | struct thermal_cooling_device *cdev) | |
445eaf87 | 124 | { |
03e859d3 | 125 | struct ti_thermal_data *data = thermal->devdata; |
5035d48d | 126 | int id; |
445eaf87 | 127 | |
0c12b5ac | 128 | if (!data || IS_ERR(data)) |
445eaf87 EV |
129 | return -ENODEV; |
130 | ||
131 | /* check if this is the cooling device we registered */ | |
132 | if (data->cool_dev != cdev) | |
133 | return 0; | |
134 | ||
135 | id = data->sensor_id; | |
445eaf87 | 136 | |
445eaf87 | 137 | /* Simple thing, two trips, one passive another critical */ |
a7a3b8c8 | 138 | return thermal_zone_bind_cooling_device(thermal, 0, cdev, |
67b4c474 | 139 | /* bind with min and max states defined by cpu_cooling */ |
a7a3b8c8 EV |
140 | THERMAL_NO_LIMIT, |
141 | THERMAL_NO_LIMIT); | |
445eaf87 EV |
142 | } |
143 | ||
144 | /* Unbind callback functions for thermal zone */ | |
03e859d3 EV |
145 | static int ti_thermal_unbind(struct thermal_zone_device *thermal, |
146 | struct thermal_cooling_device *cdev) | |
445eaf87 | 147 | { |
03e859d3 | 148 | struct ti_thermal_data *data = thermal->devdata; |
445eaf87 | 149 | |
0c12b5ac | 150 | if (!data || IS_ERR(data)) |
445eaf87 EV |
151 | return -ENODEV; |
152 | ||
153 | /* check if this is the cooling device we registered */ | |
154 | if (data->cool_dev != cdev) | |
155 | return 0; | |
156 | ||
157 | /* Simple thing, two trips, one passive another critical */ | |
158 | return thermal_zone_unbind_cooling_device(thermal, 0, cdev); | |
159 | } | |
160 | ||
161 | /* Get mode callback functions for thermal zone */ | |
03e859d3 EV |
162 | static int ti_thermal_get_mode(struct thermal_zone_device *thermal, |
163 | enum thermal_device_mode *mode) | |
445eaf87 | 164 | { |
03e859d3 | 165 | struct ti_thermal_data *data = thermal->devdata; |
445eaf87 EV |
166 | |
167 | if (data) | |
168 | *mode = data->mode; | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | /* Set mode callback functions for thermal zone */ | |
03e859d3 EV |
174 | static int ti_thermal_set_mode(struct thermal_zone_device *thermal, |
175 | enum thermal_device_mode mode) | |
445eaf87 | 176 | { |
03e859d3 | 177 | struct ti_thermal_data *data = thermal->devdata; |
10ccff1b RK |
178 | struct ti_bandgap *bgp; |
179 | ||
180 | bgp = data->bgp; | |
445eaf87 | 181 | |
03e859d3 | 182 | if (!data->ti_thermal) { |
445eaf87 EV |
183 | dev_notice(&thermal->device, "thermal zone not registered\n"); |
184 | return 0; | |
185 | } | |
186 | ||
03e859d3 | 187 | mutex_lock(&data->ti_thermal->lock); |
445eaf87 EV |
188 | |
189 | if (mode == THERMAL_DEVICE_ENABLED) | |
03e859d3 | 190 | data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE; |
445eaf87 | 191 | else |
03e859d3 | 192 | data->ti_thermal->polling_delay = 0; |
445eaf87 | 193 | |
03e859d3 | 194 | mutex_unlock(&data->ti_thermal->lock); |
445eaf87 EV |
195 | |
196 | data->mode = mode; | |
10ccff1b RK |
197 | ti_bandgap_write_update_interval(bgp, data->sensor_id, |
198 | data->ti_thermal->polling_delay); | |
03e859d3 | 199 | thermal_zone_device_update(data->ti_thermal); |
445eaf87 | 200 | dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n", |
03e859d3 | 201 | data->ti_thermal->polling_delay); |
445eaf87 EV |
202 | |
203 | return 0; | |
204 | } | |
205 | ||
206 | /* Get trip type callback functions for thermal zone */ | |
03e859d3 EV |
207 | static int ti_thermal_get_trip_type(struct thermal_zone_device *thermal, |
208 | int trip, enum thermal_trip_type *type) | |
445eaf87 | 209 | { |
03e859d3 | 210 | if (!ti_thermal_is_valid_trip(trip)) |
445eaf87 EV |
211 | return -EINVAL; |
212 | ||
213 | if (trip + 1 == OMAP_TRIP_NUMBER) | |
214 | *type = THERMAL_TRIP_CRITICAL; | |
215 | else | |
216 | *type = THERMAL_TRIP_PASSIVE; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | /* Get trip temperature callback functions for thermal zone */ | |
03e859d3 EV |
222 | static int ti_thermal_get_trip_temp(struct thermal_zone_device *thermal, |
223 | int trip, unsigned long *temp) | |
445eaf87 | 224 | { |
03e859d3 | 225 | if (!ti_thermal_is_valid_trip(trip)) |
445eaf87 EV |
226 | return -EINVAL; |
227 | ||
03e859d3 | 228 | *temp = ti_thermal_get_trip_value(trip); |
445eaf87 EV |
229 | |
230 | return 0; | |
231 | } | |
232 | ||
03b7f67b K |
233 | /* Get the temperature trend callback functions for thermal zone */ |
234 | static int ti_thermal_get_trend(struct thermal_zone_device *thermal, | |
235 | int trip, enum thermal_trend *trend) | |
236 | { | |
237 | struct ti_thermal_data *data = thermal->devdata; | |
238 | struct ti_bandgap *bgp; | |
239 | int id, tr, ret = 0; | |
240 | ||
241 | bgp = data->bgp; | |
242 | id = data->sensor_id; | |
243 | ||
244 | ret = ti_bandgap_get_trend(bgp, id, &tr); | |
245 | if (ret) | |
246 | return ret; | |
247 | ||
248 | if (tr > 0) | |
249 | *trend = THERMAL_TREND_RAISING; | |
250 | else if (tr < 0) | |
251 | *trend = THERMAL_TREND_DROPPING; | |
252 | else | |
253 | *trend = THERMAL_TREND_STABLE; | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
445eaf87 | 258 | /* Get critical temperature callback functions for thermal zone */ |
03e859d3 EV |
259 | static int ti_thermal_get_crit_temp(struct thermal_zone_device *thermal, |
260 | unsigned long *temp) | |
445eaf87 EV |
261 | { |
262 | /* shutdown zone */ | |
03e859d3 | 263 | return ti_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp); |
445eaf87 EV |
264 | } |
265 | ||
03e859d3 EV |
266 | static struct thermal_zone_device_ops ti_thermal_ops = { |
267 | .get_temp = ti_thermal_get_temp, | |
03b7f67b | 268 | .get_trend = ti_thermal_get_trend, |
03e859d3 EV |
269 | .bind = ti_thermal_bind, |
270 | .unbind = ti_thermal_unbind, | |
271 | .get_mode = ti_thermal_get_mode, | |
272 | .set_mode = ti_thermal_set_mode, | |
273 | .get_trip_type = ti_thermal_get_trip_type, | |
274 | .get_trip_temp = ti_thermal_get_trip_temp, | |
275 | .get_crit_temp = ti_thermal_get_crit_temp, | |
445eaf87 EV |
276 | }; |
277 | ||
03e859d3 EV |
278 | static struct ti_thermal_data |
279 | *ti_thermal_build_data(struct ti_bandgap *bgp, int id) | |
445eaf87 | 280 | { |
03e859d3 | 281 | struct ti_thermal_data *data; |
445eaf87 | 282 | |
d7f080e6 | 283 | data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL); |
445eaf87 | 284 | if (!data) { |
d7f080e6 | 285 | dev_err(bgp->dev, "kzalloc fail\n"); |
04a4d10d | 286 | return NULL; |
445eaf87 EV |
287 | } |
288 | data->sensor_id = id; | |
d7f080e6 | 289 | data->bgp = bgp; |
445eaf87 | 290 | data->mode = THERMAL_DEVICE_ENABLED; |
0c12b5ac | 291 | /* pcb_tz will be either valid or PTR_ERR() */ |
359836e1 | 292 | data->pcb_tz = thermal_zone_get_zone_by_name("pcb"); |
03e859d3 | 293 | INIT_WORK(&data->thermal_wq, ti_thermal_work); |
445eaf87 | 294 | |
04a4d10d EV |
295 | return data; |
296 | } | |
297 | ||
03e859d3 EV |
298 | int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id, |
299 | char *domain) | |
04a4d10d | 300 | { |
03e859d3 | 301 | struct ti_thermal_data *data; |
04a4d10d | 302 | |
03e859d3 | 303 | data = ti_bandgap_get_sensor_data(bgp, id); |
04a4d10d | 304 | |
0c12b5ac | 305 | if (!data || IS_ERR(data)) |
03e859d3 | 306 | data = ti_thermal_build_data(bgp, id); |
04a4d10d EV |
307 | |
308 | if (!data) | |
309 | return -EINVAL; | |
310 | ||
445eaf87 | 311 | /* Create thermal zone */ |
03e859d3 EV |
312 | data->ti_thermal = thermal_zone_device_register(domain, |
313 | OMAP_TRIP_NUMBER, 0, data, &ti_thermal_ops, | |
50125a9b | 314 | NULL, FAST_TEMP_MONITORING_RATE, |
765a1939 | 315 | FAST_TEMP_MONITORING_RATE); |
0c12b5ac | 316 | if (IS_ERR(data->ti_thermal)) { |
d7f080e6 | 317 | dev_err(bgp->dev, "thermal zone device is NULL\n"); |
03e859d3 | 318 | return PTR_ERR(data->ti_thermal); |
445eaf87 | 319 | } |
03e859d3 EV |
320 | data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE; |
321 | ti_bandgap_set_sensor_data(bgp, id, data); | |
10ccff1b RK |
322 | ti_bandgap_write_update_interval(bgp, data->sensor_id, |
323 | data->ti_thermal->polling_delay); | |
445eaf87 EV |
324 | |
325 | return 0; | |
326 | } | |
327 | ||
03e859d3 | 328 | int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id) |
445eaf87 | 329 | { |
03e859d3 | 330 | struct ti_thermal_data *data; |
445eaf87 | 331 | |
03e859d3 | 332 | data = ti_bandgap_get_sensor_data(bgp, id); |
445eaf87 | 333 | |
03e859d3 | 334 | thermal_zone_device_unregister(data->ti_thermal); |
445eaf87 EV |
335 | |
336 | return 0; | |
337 | } | |
338 | ||
03e859d3 | 339 | int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id) |
445eaf87 | 340 | { |
03e859d3 | 341 | struct ti_thermal_data *data; |
445eaf87 | 342 | |
03e859d3 | 343 | data = ti_bandgap_get_sensor_data(bgp, id); |
445eaf87 EV |
344 | |
345 | schedule_work(&data->thermal_wq); | |
346 | ||
347 | return 0; | |
348 | } | |
349 | ||
03e859d3 | 350 | int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id) |
445eaf87 | 351 | { |
03e859d3 | 352 | struct ti_thermal_data *data; |
445eaf87 | 353 | |
03e859d3 | 354 | data = ti_bandgap_get_sensor_data(bgp, id); |
0c12b5ac | 355 | if (!data || IS_ERR(data)) |
03e859d3 | 356 | data = ti_thermal_build_data(bgp, id); |
04a4d10d EV |
357 | |
358 | if (!data) | |
359 | return -EINVAL; | |
445eaf87 | 360 | |
f1553334 EV |
361 | if (!cpufreq_get_current_driver()) { |
362 | dev_dbg(bgp->dev, "no cpufreq driver yet\n"); | |
363 | return -EPROBE_DEFER; | |
364 | } | |
365 | ||
445eaf87 | 366 | /* Register cooling device */ |
5035d48d | 367 | data->cool_dev = cpufreq_cooling_register(cpu_present_mask); |
0c12b5ac | 368 | if (IS_ERR(data->cool_dev)) { |
d7f080e6 | 369 | dev_err(bgp->dev, |
445eaf87 EV |
370 | "Failed to register cpufreq cooling device\n"); |
371 | return PTR_ERR(data->cool_dev); | |
372 | } | |
03e859d3 | 373 | ti_bandgap_set_sensor_data(bgp, id, data); |
445eaf87 EV |
374 | |
375 | return 0; | |
376 | } | |
377 | ||
03e859d3 | 378 | int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id) |
445eaf87 | 379 | { |
03e859d3 | 380 | struct ti_thermal_data *data; |
445eaf87 | 381 | |
03e859d3 | 382 | data = ti_bandgap_get_sensor_data(bgp, id); |
445eaf87 EV |
383 | cpufreq_cooling_unregister(data->cool_dev); |
384 | ||
385 | return 0; | |
386 | } |