drivers/thermal/ti-soc-thermal/ti-thermal-common.c

   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>
  32 #include <linux/cpumask.h>
  33 #include <linux/cpu_cooling.h>
  34
  35 #include "ti-thermal.h"
  36 #include "ti-bandgap.h"
  37
  38 /* common data structures */
  39 struct ti_thermal_data {
  40         struct thermal_zone_device *ti_thermal;
  41         struct thermal_zone_device *pcb_tz;
  42         struct thermal_cooling_device *cool_dev;
  43         struct ti_bandgap *bgp;
  44         enum thermal_device_mode mode;
  45         struct work_struct thermal_wq;
  46         int sensor_id;
  47 };
  48
  49 static void ti_thermal_work(struct work_struct *work)
  50 {
  51         struct ti_thermal_data *data = container_of(work,
  52                                         struct ti_thermal_data, thermal_wq);
  53
  54         thermal_zone_device_update(data->ti_thermal);
  55
  56         dev_dbg(&data->ti_thermal->device, "updated thermal zone %s\n",
  57                 data->ti_thermal->type);
  58 }
  59
  60 /**
  61  * ti_thermal_hotspot_temperature - returns sensor extrapolated temperature
  62  * @t:  omap sensor temperature
  63  * @s:  omap sensor slope value
  64  * @c:  omap sensor const value
  65  */
  66 static inline int ti_thermal_hotspot_temperature(int t, int s, int c)
  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*/
  78 static inline int ti_thermal_get_temp(struct thermal_zone_device *thermal,
  79                                       unsigned long *temp)
  80 {
  81         struct thermal_zone_device *pcb_tz = NULL;
  82         struct ti_thermal_data *data = thermal->devdata;
  83         struct ti_bandgap *bgp;
  84         const struct ti_temp_sensor *s;
  85         int ret, tmp, slope, constant;
  86         unsigned long pcb_temp;
  87
  88         if (!data)
  89                 return 0;
  90
  91         bgp = data->bgp;
  92         s = &bgp->conf->sensors[data->sensor_id];
  93
  94         ret = ti_bandgap_read_temperature(bgp, data->sensor_id, &tmp);
  95         if (ret)
  96                 return ret;
  97
  98         /* Default constants */
  99         slope = s->slope;
 100         constant = s->constant;
 101
 102         pcb_tz = data->pcb_tz;
 103         /* In case pcb zone is available, use the extrapolation rule with it */
 104         if (!IS_ERR(pcb_tz)) {
 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");
 113                 }
 114         }
 115         *temp = ti_thermal_hotspot_temperature(tmp, slope, constant);
 116
 117         return ret;
 118 }
 119
 120 /* Bind callback functions for thermal zone */
 121 static int ti_thermal_bind(struct thermal_zone_device *thermal,
 122                            struct thermal_cooling_device *cdev)
 123 {
 124         struct ti_thermal_data *data = thermal->devdata;
 125         int id;
 126
 127         if (!data || IS_ERR(data))
 128                 return -ENODEV;
 129
 130         /* check if this is the cooling device we registered */
 131         if (data->cool_dev != cdev)
 132                 return 0;
 133
 134         id = data->sensor_id;
 135
 136         /* Simple thing, two trips, one passive another critical */
 137         return thermal_zone_bind_cooling_device(thermal, 0, cdev,
 138         /* bind with min and max states defined by cpu_cooling */
 139                                                 THERMAL_NO_LIMIT,
 140                                                 THERMAL_NO_LIMIT);
 141 }
 142
 143 /* Unbind callback functions for thermal zone */
 144 static int ti_thermal_unbind(struct thermal_zone_device *thermal,
 145                              struct thermal_cooling_device *cdev)
 146 {
 147         struct ti_thermal_data *data = thermal->devdata;
 148
 149         if (!data || IS_ERR(data))
 150                 return -ENODEV;
 151
 152         /* check if this is the cooling device we registered */
 153         if (data->cool_dev != cdev)
 154                 return 0;
 155
 156         /* Simple thing, two trips, one passive another critical */
 157         return thermal_zone_unbind_cooling_device(thermal, 0, cdev);
 158 }
 159
 160 /* Get mode callback functions for thermal zone */
 161 static int ti_thermal_get_mode(struct thermal_zone_device *thermal,
 162                                enum thermal_device_mode *mode)
 163 {
 164         struct ti_thermal_data *data = thermal->devdata;
 165
 166         if (data)
 167                 *mode = data->mode;
 168
 169         return 0;
 170 }
 171
 172 /* Set mode callback functions for thermal zone */
 173 static int ti_thermal_set_mode(struct thermal_zone_device *thermal,
 174                                enum thermal_device_mode mode)
 175 {
 176         struct ti_thermal_data *data = thermal->devdata;
 177         struct ti_bandgap *bgp;
 178
 179         bgp = data->bgp;
 180
 181         if (!data->ti_thermal) {
 182                 dev_notice(&thermal->device, "thermal zone not registered\n");
 183                 return 0;
 184         }
 185
 186         mutex_lock(&data->ti_thermal->lock);
 187
 188         if (mode == THERMAL_DEVICE_ENABLED)
 189                 data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
 190         else
 191                 data->ti_thermal->polling_delay = 0;
 192
 193         mutex_unlock(&data->ti_thermal->lock);
 194
 195         data->mode = mode;
 196         ti_bandgap_write_update_interval(bgp, data->sensor_id,
 197                                         data->ti_thermal->polling_delay);
 198         thermal_zone_device_update(data->ti_thermal);
 199         dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
 200                 data->ti_thermal->polling_delay);
 201
 202         return 0;
 203 }
 204
 205 /* Get trip type callback functions for thermal zone */
 206 static int ti_thermal_get_trip_type(struct thermal_zone_device *thermal,
 207                                     int trip, enum thermal_trip_type *type)
 208 {
 209         if (!ti_thermal_is_valid_trip(trip))
 210                 return -EINVAL;
 211
 212         if (trip + 1 == OMAP_TRIP_NUMBER)
 213                 *type = THERMAL_TRIP_CRITICAL;
 214         else
 215                 *type = THERMAL_TRIP_PASSIVE;
 216
 217         return 0;
 218 }
 219
 220 /* Get trip temperature callback functions for thermal zone */
 221 static int ti_thermal_get_trip_temp(struct thermal_zone_device *thermal,
 222                                     int trip, unsigned long *temp)
 223 {
 224         if (!ti_thermal_is_valid_trip(trip))
 225                 return -EINVAL;
 226
 227         *temp = ti_thermal_get_trip_value(trip);
 228
 229         return 0;
 230 }
 231
 232 /* Get the temperature trend callback functions for thermal zone */
 233 static int ti_thermal_get_trend(struct thermal_zone_device *thermal,
 234                                 int trip, enum thermal_trend *trend)
 235 {
 236         struct ti_thermal_data *data = thermal->devdata;
 237         struct ti_bandgap *bgp;
 238         int id, tr, ret = 0;
 239
 240         bgp = data->bgp;
 241         id = data->sensor_id;
 242
 243         ret = ti_bandgap_get_trend(bgp, id, &tr);
 244         if (ret)
 245                 return ret;
 246
 247         if (tr > 0)
 248                 *trend = THERMAL_TREND_RAISING;
 249         else if (tr < 0)
 250                 *trend = THERMAL_TREND_DROPPING;
 251         else
 252                 *trend = THERMAL_TREND_STABLE;
 253
 254         return 0;
 255 }
 256
 257 /* Get critical temperature callback functions for thermal zone */
 258 static int ti_thermal_get_crit_temp(struct thermal_zone_device *thermal,
 259                                     unsigned long *temp)
 260 {
 261         /* shutdown zone */
 262         return ti_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
 263 }
 264
 265 static struct thermal_zone_device_ops ti_thermal_ops = {
 266         .get_temp = ti_thermal_get_temp,
 267         .get_trend = ti_thermal_get_trend,
 268         .bind = ti_thermal_bind,
 269         .unbind = ti_thermal_unbind,
 270         .get_mode = ti_thermal_get_mode,
 271         .set_mode = ti_thermal_set_mode,
 272         .get_trip_type = ti_thermal_get_trip_type,
 273         .get_trip_temp = ti_thermal_get_trip_temp,
 274         .get_crit_temp = ti_thermal_get_crit_temp,
 275 };
 276
 277 static struct ti_thermal_data
 278 *ti_thermal_build_data(struct ti_bandgap *bgp, int id)
 279 {
 280         struct ti_thermal_data *data;
 281
 282         data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL);
 283         if (!data) {
 284                 dev_err(bgp->dev, "kzalloc fail\n");
 285                 return NULL;
 286         }
 287         data->sensor_id = id;
 288         data->bgp = bgp;
 289         data->mode = THERMAL_DEVICE_ENABLED;
 290         /* pcb_tz will be either valid or PTR_ERR() */
 291         data->pcb_tz = thermal_zone_get_zone_by_name("pcb");
 292         INIT_WORK(&data->thermal_wq, ti_thermal_work);
 293
 294         return data;
 295 }
 296
 297 int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id,
 298                              char *domain)
 299 {
 300         struct ti_thermal_data *data;
 301
 302         data = ti_bandgap_get_sensor_data(bgp, id);
 303
 304         if (!data || IS_ERR(data))
 305                 data = ti_thermal_build_data(bgp, id);
 306
 307         if (!data)
 308                 return -EINVAL;
 309
 310         /* Create thermal zone */
 311         data->ti_thermal = thermal_zone_device_register(domain,
 312                                 OMAP_TRIP_NUMBER, 0, data, &ti_thermal_ops,
 313                                 NULL, FAST_TEMP_MONITORING_RATE,
 314                                 FAST_TEMP_MONITORING_RATE);
 315         if (IS_ERR(data->ti_thermal)) {
 316                 dev_err(bgp->dev, "thermal zone device is NULL\n");
 317                 return PTR_ERR(data->ti_thermal);
 318         }
 319         data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
 320         ti_bandgap_set_sensor_data(bgp, id, data);
 321         ti_bandgap_write_update_interval(bgp, data->sensor_id,
 322                                         data->ti_thermal->polling_delay);
 323
 324         return 0;
 325 }
 326
 327 int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id)
 328 {
 329         struct ti_thermal_data *data;
 330
 331         data = ti_bandgap_get_sensor_data(bgp, id);
 332
 333         thermal_zone_device_unregister(data->ti_thermal);
 334
 335         return 0;
 336 }
 337
 338 int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id)
 339 {
 340         struct ti_thermal_data *data;
 341
 342         data = ti_bandgap_get_sensor_data(bgp, id);
 343
 344         schedule_work(&data->thermal_wq);
 345
 346         return 0;
 347 }
 348
 349 int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id)
 350 {
 351         struct ti_thermal_data *data;
 352
 353         data = ti_bandgap_get_sensor_data(bgp, id);
 354         if (!data || IS_ERR(data))
 355                 data = ti_thermal_build_data(bgp, id);
 356
 357         if (!data)
 358                 return -EINVAL;
 359
 360         if (!cpufreq_get_current_driver()) {
 361                 dev_dbg(bgp->dev, "no cpufreq driver yet\n");
 362                 return -EPROBE_DEFER;
 363         }
 364
 365         /* Register cooling device */
 366         data->cool_dev = cpufreq_cooling_register(cpu_present_mask);
 367         if (IS_ERR(data->cool_dev)) {
 368                 dev_err(bgp->dev,
 369                         "Failed to register cpufreq cooling device\n");
 370                 return PTR_ERR(data->cool_dev);
 371         }
 372         ti_bandgap_set_sensor_data(bgp, id, data);
 373
 374         return 0;
 375 }
 376
 377 int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id)
 378 {
 379         struct ti_thermal_data *data;
 380
 381         data = ti_bandgap_get_sensor_data(bgp, id);
 382         cpufreq_cooling_unregister(data->cool_dev);
 383
 384         return 0;
 385 }