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 }
 125
 126 /* Unbind callback functions for thermal zone */
 127 static int omap_thermal_unbind(struct thermal_zone_device *thermal,
 128                                 struct thermal_cooling_device *cdev)
 129 {
 130         struct omap_thermal_data *data = thermal->devdata;
 131
 132         if (IS_ERR_OR_NULL(data))
 133                 return -ENODEV;
 134
 135         /* check if this is the cooling device we registered */
 136         if (data->cool_dev != cdev)
 137                 return 0;
 138
 139         /* Simple thing, two trips, one passive another critical */
 140         return thermal_zone_unbind_cooling_device(thermal, 0, cdev);
 141 }
 142
 143 /* Get mode callback functions for thermal zone */
 144 static int omap_thermal_get_mode(struct thermal_zone_device *thermal,
 145                                   enum thermal_device_mode *mode)
 146 {
 147         struct omap_thermal_data *data = thermal->devdata;
 148
 149         if (data)
 150                 *mode = data->mode;
 151
 152         return 0;
 153 }
 154
 155 /* Set mode callback functions for thermal zone */
 156 static int omap_thermal_set_mode(struct thermal_zone_device *thermal,
 157                                   enum thermal_device_mode mode)
 158 {
 159         struct omap_thermal_data *data = thermal->devdata;
 160
 161         if (!data->omap_thermal) {
 162                 dev_notice(&thermal->device, "thermal zone not registered\n");
 163                 return 0;
 164         }
 165
 166         mutex_lock(&data->omap_thermal->lock);
 167
 168         if (mode == THERMAL_DEVICE_ENABLED)
 169                 data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
 170         else
 171                 data->omap_thermal->polling_delay = 0;
 172
 173         mutex_unlock(&data->omap_thermal->lock);
 174
 175         data->mode = mode;
 176         thermal_zone_device_update(data->omap_thermal);
 177         dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
 178                 data->omap_thermal->polling_delay);
 179
 180         return 0;
 181 }
 182
 183 /* Get trip type callback functions for thermal zone */
 184 static int omap_thermal_get_trip_type(struct thermal_zone_device *thermal,
 185                                        int trip, enum thermal_trip_type *type)
 186 {
 187         if (!omap_thermal_is_valid_trip(trip))
 188                 return -EINVAL;
 189
 190         if (trip + 1 == OMAP_TRIP_NUMBER)
 191                 *type = THERMAL_TRIP_CRITICAL;
 192         else
 193                 *type = THERMAL_TRIP_PASSIVE;
 194
 195         return 0;
 196 }
 197
 198 /* Get trip temperature callback functions for thermal zone */
 199 static int omap_thermal_get_trip_temp(struct thermal_zone_device *thermal,
 200                                        int trip, unsigned long *temp)
 201 {
 202         if (!omap_thermal_is_valid_trip(trip))
 203                 return -EINVAL;
 204
 205         *temp = omap_thermal_get_trip_value(trip);
 206
 207         return 0;
 208 }
 209
 210 /* Get critical temperature callback functions for thermal zone */
 211 static int omap_thermal_get_crit_temp(struct thermal_zone_device *thermal,
 212                                        unsigned long *temp)
 213 {
 214         /* shutdown zone */
 215         return omap_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
 216 }
 217
 218 static struct thermal_zone_device_ops omap_thermal_ops = {
 219         .get_temp = omap_thermal_get_temp,
 220         /* TODO: add .get_trend */
 221         .bind = omap_thermal_bind,
 222         .unbind = omap_thermal_unbind,
 223         .get_mode = omap_thermal_get_mode,
 224         .set_mode = omap_thermal_set_mode,
 225         .get_trip_type = omap_thermal_get_trip_type,
 226         .get_trip_temp = omap_thermal_get_trip_temp,
 227         .get_crit_temp = omap_thermal_get_crit_temp,
 228 };
 229
 230 int omap_thermal_expose_sensor(struct omap_bandgap *bg_ptr, int id,
 231                                char *domain)
 232 {
 233         struct omap_thermal_data *data;
 234
 235         data = devm_kzalloc(bg_ptr->dev, sizeof(*data), GFP_KERNEL);
 236         if (!data) {
 237                 dev_err(bg_ptr->dev, "kzalloc fail\n");
 238                 return -ENOMEM;
 239         }
 240         data->sensor_id = id;
 241         data->bg_ptr = bg_ptr;
 242         data->mode = THERMAL_DEVICE_ENABLED;
 243         INIT_WORK(&data->thermal_wq, omap_thermal_work);
 244
 245         /* TODO: remove TC1 TC2 */
 246         /* Create thermal zone */
 247         data->omap_thermal = thermal_zone_device_register(domain,
 248                                 OMAP_TRIP_NUMBER, 0, data, &omap_thermal_ops,
 249                                 0, FAST_TEMP_MONITORING_RATE, 0, 0);
 250         if (IS_ERR_OR_NULL(data->omap_thermal)) {
 251                 dev_err(bg_ptr->dev, "thermal zone device is NULL\n");
 252                 return PTR_ERR(data->omap_thermal);
 253         }
 254         data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
 255         omap_bandgap_set_sensor_data(bg_ptr, id, data);
 256
 257         return 0;
 258 }
 259
 260 int omap_thermal_remove_sensor(struct omap_bandgap *bg_ptr, int id)
 261 {
 262         struct omap_thermal_data *data;
 263
 264         data = omap_bandgap_get_sensor_data(bg_ptr, id);
 265
 266         thermal_zone_device_unregister(data->omap_thermal);
 267
 268         return 0;
 269 }
 270
 271 int omap_thermal_report_sensor_temperature(struct omap_bandgap *bg_ptr, int id)
 272 {
 273         struct omap_thermal_data *data;
 274
 275         data = omap_bandgap_get_sensor_data(bg_ptr, id);
 276
 277         schedule_work(&data->thermal_wq);
 278
 279         return 0;
 280 }
 281
 282 static int omap_thermal_build_cpufreq_clip(struct omap_bandgap *bg_ptr,
 283                                            struct freq_clip_table **tab_ptr,
 284                                            int *tab_size)
 285 {
 286         struct cpufreq_frequency_table *freq_table;
 287         struct freq_clip_table *tab;
 288         int i, count = 0;
 289
 290         freq_table = cpufreq_frequency_get_table(0);
 291         if (IS_ERR_OR_NULL(freq_table)) {
 292                 dev_err(bg_ptr->dev,
 293                         "%s: failed to get cpufreq table (%p)\n",
 294                         __func__, freq_table);
 295                 return -EINVAL;
 296         }
 297
 298         for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
 299                 unsigned int freq = freq_table[i].frequency;
 300                 if (freq == CPUFREQ_ENTRY_INVALID)
 301                         continue;
 302                 count++;
 303         }
 304
 305         tab = devm_kzalloc(bg_ptr->dev, sizeof(*tab) * count, GFP_KERNEL);
 306         if (!tab) {
 307                 dev_err(bg_ptr->dev,
 308                         "%s: no memory available\n", __func__);
 309                 return -ENOMEM;
 310         }
 311
 312         for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
 313                 unsigned int freq = freq_table[i].frequency;
 314
 315                 if (freq == CPUFREQ_ENTRY_INVALID)
 316                         continue;
 317
 318                 tab[count - i - 1].freq_clip_max = freq;
 319                 tab[count - i - 1].temp_level = OMAP_TRIP_HOT;
 320                 tab[count - i - 1].mask_val = cpumask_of(0);
 321         }
 322
 323         *tab_ptr = tab;
 324         *tab_size = count;
 325
 326         return 0;
 327 }
 328
 329 int omap_thermal_register_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
 330 {
 331         struct omap_thermal_data *data;
 332         struct freq_clip_table *tab_ptr;
 333         int tab_size, ret;
 334
 335         data = omap_bandgap_get_sensor_data(bg_ptr, id);
 336
 337         ret = omap_thermal_build_cpufreq_clip(bg_ptr, &tab_ptr, &tab_size);
 338         if (ret < 0) {
 339                 dev_err(bg_ptr->dev,
 340                         "%s: failed to build cpufreq clip table\n", __func__);
 341                 return ret;
 342         }
 343
 344         /* Register cooling device */
 345         data->cool_dev = cpufreq_cooling_register(tab_ptr, tab_size);
 346         if (IS_ERR_OR_NULL(data->cool_dev)) {
 347                 dev_err(bg_ptr->dev,
 348                         "Failed to register cpufreq cooling device\n");
 349                 return PTR_ERR(data->cool_dev);
 350         }
 351         bg_ptr->conf->sensors[id].cooling_data.freq_clip_count = tab_size;
 352
 353         return 0;
 354 }
 355
 356 int omap_thermal_unregister_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
 357 {
 358         struct omap_thermal_data *data;
 359
 360         data = omap_bandgap_get_sensor_data(bg_ptr, id);
 361         cpufreq_cooling_unregister(data->cool_dev);
 362
 363         return 0;
 364 }