Pileus Git - ~andy/linux/blob - 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/cpu_cooling.h>
  33
  34 #include "omap-thermal.h"
  35 #include "omap-bandgap.h"
  36
  37 /* common data structures */
  38 struct omap_thermal_data {
  39         struct thermal_zone_device *omap_thermal;
  40         struct thermal_cooling_device *cool_dev;
  41         struct omap_bandgap *bg_ptr;
  42         enum thermal_device_mode mode;
  43         struct work_struct thermal_wq;
  44         int sensor_id;
  45 };
  46
  47 static void omap_thermal_work(struct work_struct *work)
  48 {
  49         struct omap_thermal_data *data = container_of(work,
  50                                         struct omap_thermal_data, thermal_wq);
  51
  52         thermal_zone_device_update(data->omap_thermal);
  53
  54         dev_dbg(&data->omap_thermal->device, "updated thermal zone %s\n",
  55                 data->omap_thermal->type);
  56 }
  57
  58 /**
  59  * omap_thermal_hotspot_temperature - returns sensor extrapolated temperature
  60  * @t:  omap sensor temperature
  61  * @s:  omap sensor slope value
  62  * @c:  omap sensor const value
  63  */
  64 static inline int omap_thermal_hotspot_temperature(int t, int s, int c)
  65 {
  66         int delta = t * s / 1000 + c;
  67
  68         if (delta < 0)
  69                 delta = 0;
  70
  71         return t + delta;
  72 }
  73
  74 /* thermal zone ops */
  75 /* Get temperature callback function for thermal zone*/
  76 static inline int omap_thermal_get_temp(struct thermal_zone_device *thermal,
  77                                          unsigned long *temp)
  78 {
  79         struct omap_thermal_data *data = thermal->devdata;
  80         struct omap_bandgap *bg_ptr = data->bg_ptr;
  81         struct omap_temp_sensor *s = &bg_ptr->conf->sensors[data->sensor_id];
  82         int ret, tmp, pcb_temp, slope, constant;
  83
  84         ret = omap_bandgap_read_temperature(bg_ptr, data->sensor_id, &tmp);
  85         if (ret)
  86                 return ret;
  87
  88         pcb_temp = 0;
  89         /* TODO: Introduce pcb temperature lookup */
  90         /* In case pcb zone is available, use the extrapolation rule with it */
  91         if (pcb_temp) {
  92                 tmp -= pcb_temp;
  93                 slope = s->slope_pcb;
  94                 constant = s->constant_pcb;
  95         } else {
  96                 slope = s->slope;
  97                 constant = s->constant;
  98         }
  99         *temp = omap_thermal_hotspot_temperature(tmp, slope, constant);
 100
 101         return ret;
 102 }
 103
 104 /* Bind callback functions for thermal zone */
 105 static int omap_thermal_bind(struct thermal_zone_device *thermal,
 106                               struct thermal_cooling_device *cdev)
 107 {
 108         struct omap_thermal_data *data = thermal->devdata;
 109         int max, id;
 110
 111         if (IS_ERR_OR_NULL(data))
 112                 return -ENODEV;
 113
 114         /* check if this is the cooling device we registered */
 115         if (data->cool_dev != cdev)
 116                 return 0;
 117
 118         id = data->sensor_id;
 119         max = data->bg_ptr->conf->sensors[id].cooling_data.freq_clip_count;
 120
 121         /* TODO: bind with min and max states */
 122         /* Simple thing, two trips, one passive another critical */
 123         return thermal_zone_bind_cooling_device(thermal, 0, cdev,
 124                                                 THERMAL_NO_LIMIT,
 125                                                 THERMAL_NO_LIMIT);
 126 }
 127
 128 /* Unbind callback functions for thermal zone */
 129 static int omap_thermal_unbind(struct thermal_zone_device *thermal,
 130                                 struct thermal_cooling_device *cdev)
 131 {
 132         struct omap_thermal_data *data = thermal->devdata;
 133
 134         if (IS_ERR_OR_NULL(data))
 135                 return -ENODEV;
 136
 137         /* check if this is the cooling device we registered */
 138         if (data->cool_dev != cdev)
 139                 return 0;
 140
 141         /* Simple thing, two trips, one passive another critical */
 142         return thermal_zone_unbind_cooling_device(thermal, 0, cdev);
 143 }
 144
 145 /* Get mode callback functions for thermal zone */
 146 static int omap_thermal_get_mode(struct thermal_zone_device *thermal,
 147                                   enum thermal_device_mode *mode)
 148 {
 149         struct omap_thermal_data *data = thermal->devdata;
 150
 151         if (data)
 152                 *mode = data->mode;
 153
 154         return 0;
 155 }
 156
 157 /* Set mode callback functions for thermal zone */
 158 static int omap_thermal_set_mode(struct thermal_zone_device *thermal,
 159                                   enum thermal_device_mode mode)
 160 {
 161         struct omap_thermal_data *data = thermal->devdata;
 162
 163         if (!data->omap_thermal) {
 164                 dev_notice(&thermal->device, "thermal zone not registered\n");
 165                 return 0;
 166         }
 167
 168         mutex_lock(&data->omap_thermal->lock);
 169
 170         if (mode == THERMAL_DEVICE_ENABLED)
 171                 data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
 172         else
 173                 data->omap_thermal->polling_delay = 0;
 174
 175         mutex_unlock(&data->omap_thermal->lock);
 176
 177         data->mode = mode;
 178         thermal_zone_device_update(data->omap_thermal);
 179         dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
 180                 data->omap_thermal->polling_delay);
 181
 182         return 0;
 183 }
 184
 185 /* Get trip type callback functions for thermal zone */
 186 static int omap_thermal_get_trip_type(struct thermal_zone_device *thermal,
 187                                        int trip, enum thermal_trip_type *type)
 188 {
 189         if (!omap_thermal_is_valid_trip(trip))
 190                 return -EINVAL;
 191
 192         if (trip + 1 == OMAP_TRIP_NUMBER)
 193                 *type = THERMAL_TRIP_CRITICAL;
 194         else
 195                 *type = THERMAL_TRIP_PASSIVE;
 196
 197         return 0;
 198 }
 199
 200 /* Get trip temperature callback functions for thermal zone */
 201 static int omap_thermal_get_trip_temp(struct thermal_zone_device *thermal,
 202                                        int trip, unsigned long *temp)
 203 {
 204         if (!omap_thermal_is_valid_trip(trip))
 205                 return -EINVAL;
 206
 207         *temp = omap_thermal_get_trip_value(trip);
 208
 209         return 0;
 210 }
 211
 212 /* Get critical temperature callback functions for thermal zone */
 213 static int omap_thermal_get_crit_temp(struct thermal_zone_device *thermal,
 214                                        unsigned long *temp)
 215 {
 216         /* shutdown zone */
 217         return omap_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
 218 }
 219
 220 static struct thermal_zone_device_ops omap_thermal_ops = {
 221         .get_temp = omap_thermal_get_temp,
 222         /* TODO: add .get_trend */
 223         .bind = omap_thermal_bind,
 224         .unbind = omap_thermal_unbind,
 225         .get_mode = omap_thermal_get_mode,
 226         .set_mode = omap_thermal_set_mode,
 227         .get_trip_type = omap_thermal_get_trip_type,
 228         .get_trip_temp = omap_thermal_get_trip_temp,
 229         .get_crit_temp = omap_thermal_get_crit_temp,
 230 };
 231
 232 int omap_thermal_expose_sensor(struct omap_bandgap *bg_ptr, int id,
 233                                char *domain)
 234 {
 235         struct omap_thermal_data *data;
 236
 237         data = devm_kzalloc(bg_ptr->dev, sizeof(*data), GFP_KERNEL);
 238         if (!data) {
 239                 dev_err(bg_ptr->dev, "kzalloc fail\n");
 240                 return -ENOMEM;
 241         }
 242         data->sensor_id = id;
 243         data->bg_ptr = bg_ptr;
 244         data->mode = THERMAL_DEVICE_ENABLED;
 245         INIT_WORK(&data->thermal_wq, omap_thermal_work);
 246
 247         /* TODO: remove TC1 TC2 */
 248         /* Create thermal zone */
 249         data->omap_thermal = thermal_zone_device_register(domain,
 250                                 OMAP_TRIP_NUMBER, 0, data, &omap_thermal_ops,
 251                                 0, FAST_TEMP_MONITORING_RATE);
 252         if (IS_ERR_OR_NULL(data->omap_thermal)) {
 253                 dev_err(bg_ptr->dev, "thermal zone device is NULL\n");
 254                 return PTR_ERR(data->omap_thermal);
 255         }
 256         data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
 257         omap_bandgap_set_sensor_data(bg_ptr, id, data);
 258
 259         return 0;
 260 }
 261
 262 int omap_thermal_remove_sensor(struct omap_bandgap *bg_ptr, int id)
 263 {
 264         struct omap_thermal_data *data;
 265
 266         data = omap_bandgap_get_sensor_data(bg_ptr, id);
 267
 268         thermal_zone_device_unregister(data->omap_thermal);
 269
 270         return 0;
 271 }
 272
 273 int omap_thermal_report_sensor_temperature(struct omap_bandgap *bg_ptr, int id)
 274 {
 275         struct omap_thermal_data *data;
 276
 277         data = omap_bandgap_get_sensor_data(bg_ptr, id);
 278
 279         schedule_work(&data->thermal_wq);
 280
 281         return 0;
 282 }
 283
 284 static int omap_thermal_build_cpufreq_clip(struct omap_bandgap *bg_ptr,
 285                                            struct freq_clip_table **tab_ptr,
 286                                            int *tab_size)
 287 {
 288         struct cpufreq_frequency_table *freq_table;
 289         struct freq_clip_table *tab;
 290         int i, count = 0;
 291
 292         freq_table = cpufreq_frequency_get_table(0);
 293         if (IS_ERR_OR_NULL(freq_table)) {
 294                 dev_err(bg_ptr->dev,
 295                         "%s: failed to get cpufreq table (%p)\n",
 296                         __func__, freq_table);
 297                 return -EINVAL;
 298         }
 299
 300         for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
 301                 unsigned int freq = freq_table[i].frequency;
 302                 if (freq == CPUFREQ_ENTRY_INVALID)
 303                         continue;
 304                 count++;
 305         }
 306
 307         tab = devm_kzalloc(bg_ptr->dev, sizeof(*tab) * count, GFP_KERNEL);
 308         if (!tab) {
 309                 dev_err(bg_ptr->dev,
 310                         "%s: no memory available\n", __func__);
 311                 return -ENOMEM;
 312         }
 313
 314         for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
 315                 unsigned int freq = freq_table[i].frequency;
 316
 317                 if (freq == CPUFREQ_ENTRY_INVALID)
 318                         continue;
 319
 320                 tab[count - i - 1].freq_clip_max = freq;
 321                 tab[count - i - 1].temp_level = OMAP_TRIP_HOT;
 322                 tab[count - i - 1].mask_val = cpumask_of(0);
 323         }
 324
 325         *tab_ptr = tab;
 326         *tab_size = count;
 327
 328         return 0;
 329 }
 330
 331 int omap_thermal_register_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
 332 {
 333         struct omap_thermal_data *data;
 334         struct freq_clip_table *tab_ptr;
 335         int tab_size, ret;
 336
 337         data = omap_bandgap_get_sensor_data(bg_ptr, id);
 338
 339         ret = omap_thermal_build_cpufreq_clip(bg_ptr, &tab_ptr, &tab_size);
 340         if (ret < 0) {
 341                 dev_err(bg_ptr->dev,
 342                         "%s: failed to build cpufreq clip table\n", __func__);
 343                 return ret;
 344         }
 345
 346         /* Register cooling device */
 347         data->cool_dev = cpufreq_cooling_register(tab_ptr, tab_size);
 348         if (IS_ERR_OR_NULL(data->cool_dev)) {
 349                 dev_err(bg_ptr->dev,
 350                         "Failed to register cpufreq cooling device\n");
 351                 return PTR_ERR(data->cool_dev);
 352         }
 353         bg_ptr->conf->sensors[id].cooling_data.freq_clip_count = tab_size;
 354
 355         return 0;
 356 }
 357
 358 int omap_thermal_unregister_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
 359 {
 360         struct omap_thermal_data *data;
 361
 362         data = omap_bandgap_get_sensor_data(bg_ptr, id);
 363         cpufreq_cooling_unregister(data->cool_dev);
 364
 365         return 0;
 366 }