2 * OMAP thermal driver interface
4 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
6 * Eduardo Valentin <eduardo.valentin@ti.com>
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.
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.
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
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>
32 #include <linux/cpumask.h>
33 #include <linux/cpu_cooling.h>
35 #include "ti-thermal.h"
36 #include "ti-bandgap.h"
38 /* common data structures */
39 struct ti_thermal_data {
40 struct thermal_zone_device *ti_thermal;
41 struct thermal_cooling_device *cool_dev;
42 struct ti_bandgap *bgp;
43 enum thermal_device_mode mode;
44 struct work_struct thermal_wq;
48 static void ti_thermal_work(struct work_struct *work)
50 struct ti_thermal_data *data = container_of(work,
51 struct ti_thermal_data, thermal_wq);
53 thermal_zone_device_update(data->ti_thermal);
55 dev_dbg(&data->ti_thermal->device, "updated thermal zone %s\n",
56 data->ti_thermal->type);
60 * ti_thermal_hotspot_temperature - returns sensor extrapolated temperature
61 * @t: omap sensor temperature
62 * @s: omap sensor slope value
63 * @c: omap sensor const value
65 static inline int ti_thermal_hotspot_temperature(int t, int s, int c)
67 int delta = t * s / 1000 + c;
75 /* thermal zone ops */
76 /* Get temperature callback function for thermal zone*/
77 static inline int ti_thermal_get_temp(struct thermal_zone_device *thermal,
80 struct ti_thermal_data *data = thermal->devdata;
81 struct ti_bandgap *bgp;
82 const struct ti_temp_sensor *s;
83 int ret, tmp, pcb_temp, slope, constant;
89 s = &bgp->conf->sensors[data->sensor_id];
91 ret = ti_bandgap_read_temperature(bgp, data->sensor_id, &tmp);
96 /* TODO: Introduce pcb temperature lookup */
97 /* In case pcb zone is available, use the extrapolation rule with it */
100 slope = s->slope_pcb;
101 constant = s->constant_pcb;
104 constant = s->constant;
106 *temp = ti_thermal_hotspot_temperature(tmp, slope, constant);
111 /* Bind callback functions for thermal zone */
112 static int ti_thermal_bind(struct thermal_zone_device *thermal,
113 struct thermal_cooling_device *cdev)
115 struct ti_thermal_data *data = thermal->devdata;
118 if (IS_ERR_OR_NULL(data))
121 /* check if this is the cooling device we registered */
122 if (data->cool_dev != cdev)
125 id = data->sensor_id;
127 /* Simple thing, two trips, one passive another critical */
128 return thermal_zone_bind_cooling_device(thermal, 0, cdev,
129 /* bind with min and max states defined by cpu_cooling */
134 /* Unbind callback functions for thermal zone */
135 static int ti_thermal_unbind(struct thermal_zone_device *thermal,
136 struct thermal_cooling_device *cdev)
138 struct ti_thermal_data *data = thermal->devdata;
140 if (IS_ERR_OR_NULL(data))
143 /* check if this is the cooling device we registered */
144 if (data->cool_dev != cdev)
147 /* Simple thing, two trips, one passive another critical */
148 return thermal_zone_unbind_cooling_device(thermal, 0, cdev);
151 /* Get mode callback functions for thermal zone */
152 static int ti_thermal_get_mode(struct thermal_zone_device *thermal,
153 enum thermal_device_mode *mode)
155 struct ti_thermal_data *data = thermal->devdata;
163 /* Set mode callback functions for thermal zone */
164 static int ti_thermal_set_mode(struct thermal_zone_device *thermal,
165 enum thermal_device_mode mode)
167 struct ti_thermal_data *data = thermal->devdata;
169 if (!data->ti_thermal) {
170 dev_notice(&thermal->device, "thermal zone not registered\n");
174 mutex_lock(&data->ti_thermal->lock);
176 if (mode == THERMAL_DEVICE_ENABLED)
177 data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
179 data->ti_thermal->polling_delay = 0;
181 mutex_unlock(&data->ti_thermal->lock);
184 thermal_zone_device_update(data->ti_thermal);
185 dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
186 data->ti_thermal->polling_delay);
191 /* Get trip type callback functions for thermal zone */
192 static int ti_thermal_get_trip_type(struct thermal_zone_device *thermal,
193 int trip, enum thermal_trip_type *type)
195 if (!ti_thermal_is_valid_trip(trip))
198 if (trip + 1 == OMAP_TRIP_NUMBER)
199 *type = THERMAL_TRIP_CRITICAL;
201 *type = THERMAL_TRIP_PASSIVE;
206 /* Get trip temperature callback functions for thermal zone */
207 static int ti_thermal_get_trip_temp(struct thermal_zone_device *thermal,
208 int trip, unsigned long *temp)
210 if (!ti_thermal_is_valid_trip(trip))
213 *temp = ti_thermal_get_trip_value(trip);
218 /* Get the temperature trend callback functions for thermal zone */
219 static int ti_thermal_get_trend(struct thermal_zone_device *thermal,
220 int trip, enum thermal_trend *trend)
222 struct ti_thermal_data *data = thermal->devdata;
223 struct ti_bandgap *bgp;
227 id = data->sensor_id;
229 ret = ti_bandgap_get_trend(bgp, id, &tr);
234 *trend = THERMAL_TREND_RAISING;
236 *trend = THERMAL_TREND_DROPPING;
238 *trend = THERMAL_TREND_STABLE;
243 /* Get critical temperature callback functions for thermal zone */
244 static int ti_thermal_get_crit_temp(struct thermal_zone_device *thermal,
248 return ti_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
251 static struct thermal_zone_device_ops ti_thermal_ops = {
252 .get_temp = ti_thermal_get_temp,
253 .get_trend = ti_thermal_get_trend,
254 .bind = ti_thermal_bind,
255 .unbind = ti_thermal_unbind,
256 .get_mode = ti_thermal_get_mode,
257 .set_mode = ti_thermal_set_mode,
258 .get_trip_type = ti_thermal_get_trip_type,
259 .get_trip_temp = ti_thermal_get_trip_temp,
260 .get_crit_temp = ti_thermal_get_crit_temp,
263 static struct ti_thermal_data
264 *ti_thermal_build_data(struct ti_bandgap *bgp, int id)
266 struct ti_thermal_data *data;
268 data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL);
270 dev_err(bgp->dev, "kzalloc fail\n");
273 data->sensor_id = id;
275 data->mode = THERMAL_DEVICE_ENABLED;
276 INIT_WORK(&data->thermal_wq, ti_thermal_work);
281 int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id,
284 struct ti_thermal_data *data;
286 data = ti_bandgap_get_sensor_data(bgp, id);
288 if (IS_ERR_OR_NULL(data))
289 data = ti_thermal_build_data(bgp, id);
294 /* Create thermal zone */
295 data->ti_thermal = thermal_zone_device_register(domain,
296 OMAP_TRIP_NUMBER, 0, data, &ti_thermal_ops,
297 NULL, FAST_TEMP_MONITORING_RATE,
298 FAST_TEMP_MONITORING_RATE);
299 if (IS_ERR_OR_NULL(data->ti_thermal)) {
300 dev_err(bgp->dev, "thermal zone device is NULL\n");
301 return PTR_ERR(data->ti_thermal);
303 data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
304 ti_bandgap_set_sensor_data(bgp, id, data);
309 int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id)
311 struct ti_thermal_data *data;
313 data = ti_bandgap_get_sensor_data(bgp, id);
315 thermal_zone_device_unregister(data->ti_thermal);
320 int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id)
322 struct ti_thermal_data *data;
324 data = ti_bandgap_get_sensor_data(bgp, id);
326 schedule_work(&data->thermal_wq);
331 int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id)
333 struct ti_thermal_data *data;
335 data = ti_bandgap_get_sensor_data(bgp, id);
336 if (IS_ERR_OR_NULL(data))
337 data = ti_thermal_build_data(bgp, id);
342 if (!cpufreq_get_current_driver()) {
343 dev_dbg(bgp->dev, "no cpufreq driver yet\n");
344 return -EPROBE_DEFER;
347 /* Register cooling device */
348 data->cool_dev = cpufreq_cooling_register(cpu_present_mask);
349 if (IS_ERR_OR_NULL(data->cool_dev)) {
351 "Failed to register cpufreq cooling device\n");
352 return PTR_ERR(data->cool_dev);
354 ti_bandgap_set_sensor_data(bgp, id, data);
359 int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id)
361 struct ti_thermal_data *data;
363 data = ti_bandgap_get_sensor_data(bgp, id);
364 cpufreq_cooling_unregister(data->cool_dev);