drivers/staging/omap-thermal/omap-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 "omap-thermal.h"
  36 #include "omap-bandgap.h"
  37
  38 /* common data structures */
  39 struct omap_thermal_data {
  40         struct thermal_zone_device *omap_thermal;
  41         struct thermal_cooling_device *cool_dev;
  42         struct omap_bandgap *bg_ptr;
  43         enum thermal_device_mode mode;
  44         struct work_struct thermal_wq;
  45         int sensor_id;
  46 };
  47
  48 static void omap_thermal_work(struct work_struct *work)
  49 {
  50         struct omap_thermal_data *data = container_of(work,
  51                                         struct omap_thermal_data, thermal_wq);
  52
  53         thermal_zone_device_update(data->omap_thermal);
  54
  55         dev_dbg(&data->omap_thermal->device, "updated thermal zone %s\n",
  56                 data->omap_thermal->type);
  57 }
  58
  59 /**
  60  * omap_thermal_hotspot_temperature - returns sensor extrapolated temperature
  61  * @t:  omap sensor temperature
  62  * @s:  omap sensor slope value
  63  * @c:  omap sensor const value
  64  */
  65 static inline int omap_thermal_hotspot_temperature(int t, int s, int c)
  66 {
  67         int delta = t * s / 1000 + c;
  68
  69         if (delta < 0)
  70                 delta = 0;
  71
  72         return t + delta;
  73 }
  74
  75 /* thermal zone ops */
  76 /* Get temperature callback function for thermal zone*/
  77 static inline int omap_thermal_get_temp(struct thermal_zone_device *thermal,
  78                                          unsigned long *temp)
  79 {
  80         struct omap_thermal_data *data = thermal->devdata;
  81         struct omap_bandgap *bg_ptr;
  82         struct omap_temp_sensor *s;
  83         int ret, tmp, pcb_temp, slope, constant;
  84
  85         if (!data)
  86                 return 0;
  87
  88         bg_ptr = data->bg_ptr;
  89         s = &bg_ptr->conf->sensors[data->sensor_id];
  90
  91         ret = omap_bandgap_read_temperature(bg_ptr, data->sensor_id, &tmp);
  92         if (ret)
  93                 return ret;
  94
  95         pcb_temp = 0;
  96         /* TODO: Introduce pcb temperature lookup */
  97         /* In case pcb zone is available, use the extrapolation rule with it */
  98         if (pcb_temp) {
  99                 tmp -= pcb_temp;
 100                 slope = s->slope_pcb;
 101                 constant = s->constant_pcb;
 102         } else {
 103                 slope = s->slope;
 104                 constant = s->constant;
 105         }
 106         *temp = omap_thermal_hotspot_temperature(tmp, slope, constant);
 107
 108         return ret;
 109 }
 110
 111 /* Bind callback functions for thermal zone */
 112 static int omap_thermal_bind(struct thermal_zone_device *thermal,
 113                               struct thermal_cooling_device *cdev)
 114 {
 115         struct omap_thermal_data *data = thermal->devdata;
 116         int id;
 117
 118         if (IS_ERR_OR_NULL(data))
 119                 return -ENODEV;
 120
 121         /* check if this is the cooling device we registered */
 122         if (data->cool_dev != cdev)
 123                 return 0;
 124
 125         id = data->sensor_id;
 126
 127         /* TODO: bind with min and max states */
 128         /* Simple thing, two trips, one passive another critical */
 129         return thermal_zone_bind_cooling_device(thermal, 0, cdev,
 130                                                 THERMAL_NO_LIMIT,
 131                                                 THERMAL_NO_LIMIT);
 132 }
 133
 134 /* Unbind callback functions for thermal zone */
 135 static int omap_thermal_unbind(struct thermal_zone_device *thermal,
 136                                 struct thermal_cooling_device *cdev)
 137 {
 138         struct omap_thermal_data *data = thermal->devdata;
 139
 140         if (IS_ERR_OR_NULL(data))
 141                 return -ENODEV;
 142
 143         /* check if this is the cooling device we registered */
 144         if (data->cool_dev != cdev)
 145                 return 0;
 146
 147         /* Simple thing, two trips, one passive another critical */
 148         return thermal_zone_unbind_cooling_device(thermal, 0, cdev);
 149 }
 150
 151 /* Get mode callback functions for thermal zone */
 152 static int omap_thermal_get_mode(struct thermal_zone_device *thermal,
 153                                   enum thermal_device_mode *mode)
 154 {
 155         struct omap_thermal_data *data = thermal->devdata;
 156
 157         if (data)
 158                 *mode = data->mode;
 159
 160         return 0;
 161 }
 162
 163 /* Set mode callback functions for thermal zone */
 164 static int omap_thermal_set_mode(struct thermal_zone_device *thermal,
 165                                   enum thermal_device_mode mode)
 166 {
 167         struct omap_thermal_data *data = thermal->devdata;
 168
 169         if (!data->omap_thermal) {
 170                 dev_notice(&thermal->device, "thermal zone not registered\n");
 171                 return 0;
 172         }
 173
 174         mutex_lock(&data->omap_thermal->lock);
 175
 176         if (mode == THERMAL_DEVICE_ENABLED)
 177                 data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
 178         else
 179                 data->omap_thermal->polling_delay = 0;
 180
 181         mutex_unlock(&data->omap_thermal->lock);
 182
 183         data->mode = mode;
 184         thermal_zone_device_update(data->omap_thermal);
 185         dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
 186                 data->omap_thermal->polling_delay);
 187
 188         return 0;
 189 }
 190
 191 /* Get trip type callback functions for thermal zone */
 192 static int omap_thermal_get_trip_type(struct thermal_zone_device *thermal,
 193                                        int trip, enum thermal_trip_type *type)
 194 {
 195         if (!omap_thermal_is_valid_trip(trip))
 196                 return -EINVAL;
 197
 198         if (trip + 1 == OMAP_TRIP_NUMBER)
 199                 *type = THERMAL_TRIP_CRITICAL;
 200         else
 201                 *type = THERMAL_TRIP_PASSIVE;
 202
 203         return 0;
 204 }
 205
 206 /* Get trip temperature callback functions for thermal zone */
 207 static int omap_thermal_get_trip_temp(struct thermal_zone_device *thermal,
 208                                        int trip, unsigned long *temp)
 209 {
 210         if (!omap_thermal_is_valid_trip(trip))
 211                 return -EINVAL;
 212
 213         *temp = omap_thermal_get_trip_value(trip);
 214
 215         return 0;
 216 }
 217
 218 /* Get critical temperature callback functions for thermal zone */
 219 static int omap_thermal_get_crit_temp(struct thermal_zone_device *thermal,
 220                                        unsigned long *temp)
 221 {
 222         /* shutdown zone */
 223         return omap_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
 224 }
 225
 226 static struct thermal_zone_device_ops omap_thermal_ops = {
 227         .get_temp = omap_thermal_get_temp,
 228         /* TODO: add .get_trend */
 229         .bind = omap_thermal_bind,
 230         .unbind = omap_thermal_unbind,
 231         .get_mode = omap_thermal_get_mode,
 232         .set_mode = omap_thermal_set_mode,
 233         .get_trip_type = omap_thermal_get_trip_type,
 234         .get_trip_temp = omap_thermal_get_trip_temp,
 235         .get_crit_temp = omap_thermal_get_crit_temp,
 236 };
 237
 238 static struct omap_thermal_data
 239 *omap_thermal_build_data(struct omap_bandgap *bg_ptr, int id)
 240 {
 241         struct omap_thermal_data *data;
 242
 243         data = devm_kzalloc(bg_ptr->dev, sizeof(*data), GFP_KERNEL);
 244         if (!data) {
 245                 dev_err(bg_ptr->dev, "kzalloc fail\n");
 246                 return NULL;
 247         }
 248         data->sensor_id = id;
 249         data->bg_ptr = bg_ptr;
 250         data->mode = THERMAL_DEVICE_ENABLED;
 251         INIT_WORK(&data->thermal_wq, omap_thermal_work);
 252
 253         return data;
 254 }
 255
 256 int omap_thermal_expose_sensor(struct omap_bandgap *bg_ptr, int id,
 257                                char *domain)
 258 {
 259         struct omap_thermal_data *data;
 260
 261         data = omap_bandgap_get_sensor_data(bg_ptr, id);
 262
 263         if (!data)
 264                 data = omap_thermal_build_data(bg_ptr, id);
 265
 266         if (!data)
 267                 return -EINVAL;
 268
 269         /* TODO: remove TC1 TC2 */
 270         /* Create thermal zone */
 271         data->omap_thermal = thermal_zone_device_register(domain,
 272                                 OMAP_TRIP_NUMBER, 0, data, &omap_thermal_ops,
 273                                 NULL, FAST_TEMP_MONITORING_RATE,
 274                                 FAST_TEMP_MONITORING_RATE);
 275         if (IS_ERR_OR_NULL(data->omap_thermal)) {
 276                 dev_err(bg_ptr->dev, "thermal zone device is NULL\n");
 277                 return PTR_ERR(data->omap_thermal);
 278         }
 279         data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
 280         omap_bandgap_set_sensor_data(bg_ptr, id, data);
 281
 282         return 0;
 283 }
 284
 285 int omap_thermal_remove_sensor(struct omap_bandgap *bg_ptr, int id)
 286 {
 287         struct omap_thermal_data *data;
 288
 289         data = omap_bandgap_get_sensor_data(bg_ptr, id);
 290
 291         thermal_zone_device_unregister(data->omap_thermal);
 292
 293         return 0;
 294 }
 295
 296 int omap_thermal_report_sensor_temperature(struct omap_bandgap *bg_ptr, int id)
 297 {
 298         struct omap_thermal_data *data;
 299
 300         data = omap_bandgap_get_sensor_data(bg_ptr, id);
 301
 302         schedule_work(&data->thermal_wq);
 303
 304         return 0;
 305 }
 306
 307 int omap_thermal_register_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
 308 {
 309         struct omap_thermal_data *data;
 310
 311         data = omap_bandgap_get_sensor_data(bg_ptr, id);
 312         if (!data)
 313                 data = omap_thermal_build_data(bg_ptr, id);
 314
 315         if (!data)
 316                 return -EINVAL;
 317
 318         /* Register cooling device */
 319         data->cool_dev = cpufreq_cooling_register(cpu_present_mask);
 320         if (IS_ERR_OR_NULL(data->cool_dev)) {
 321                 dev_err(bg_ptr->dev,
 322                         "Failed to register cpufreq cooling device\n");
 323                 return PTR_ERR(data->cool_dev);
 324         }
 325         omap_bandgap_set_sensor_data(bg_ptr, id, data);
 326
 327         return 0;
 328 }
 329
 330 int omap_thermal_unregister_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
 331 {
 332         struct omap_thermal_data *data;
 333
 334         data = omap_bandgap_get_sensor_data(bg_ptr, id);
 335         cpufreq_cooling_unregister(data->cool_dev);
 336
 337         return 0;
 338 }