drivers/staging/omap-thermal/omap-bandgap.c

   1 /*
   2  * OMAP4 Bandgap temperature sensor driver
   3  *
   4  * Copyright (C) 2011-2012 Texas Instruments Incorporated - http://www.ti.com/
   5  * Author: J Keerthy <j-keerthy@ti.com>
   6  * Author: Moiz Sonasath <m-sonasath@ti.com>
   7  * Couple of fixes, DT and MFD adaptation:
   8  *   Eduardo Valentin <eduardo.valentin@ti.com>
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * version 2 as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  22  * 02110-1301 USA
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/export.h>
  28 #include <linux/init.h>
  29 #include <linux/kernel.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/clk.h>
  32 #include <linux/gpio.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/err.h>
  35 #include <linux/types.h>
  36 #include <linux/mutex.h>
  37 #include <linux/reboot.h>
  38 #include <linux/of_device.h>
  39 #include <linux/of_platform.h>
  40 #include <linux/of_irq.h>
  41
  42 #include "omap-bandgap.h"
  43
  44 static u32 omap_bandgap_readl(struct omap_bandgap *bg_ptr, u32 reg)
  45 {
  46         return readl(bg_ptr->base + reg);
  47 }
  48
  49 static void omap_bandgap_writel(struct omap_bandgap *bg_ptr, u32 val, u32 reg)
  50 {
  51         writel(val, bg_ptr->base + reg);
  52 }
  53
  54 static int omap_bandgap_power(struct omap_bandgap *bg_ptr, bool on)
  55 {
  56         struct temp_sensor_registers *tsr;
  57         int i;
  58         u32 ctrl;
  59
  60         if (!OMAP_BANDGAP_HAS(bg_ptr, POWER_SWITCH))
  61                 return 0;
  62
  63         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
  64                 tsr = bg_ptr->conf->sensors[i].registers;
  65                 ctrl = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
  66                 ctrl &= ~tsr->bgap_tempsoff_mask;
  67                 /* active on 0 */
  68                 ctrl |= !on << __ffs(tsr->bgap_tempsoff_mask);
  69
  70                 /* write BGAP_TEMPSOFF should be reset to 0 */
  71                 omap_bandgap_writel(bg_ptr, ctrl, tsr->temp_sensor_ctrl);
  72         }
  73
  74         return 0;
  75 }
  76
  77 /* This is the Talert handler. Call it only if HAS(TALERT) is set */
  78 static irqreturn_t talert_irq_handler(int irq, void *data)
  79 {
  80         struct omap_bandgap *bg_ptr = data;
  81         struct temp_sensor_registers *tsr;
  82         u32 t_hot = 0, t_cold = 0, temp, ctrl;
  83         int i;
  84
  85         bg_ptr = data;
  86         /* Read the status of t_hot */
  87         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
  88                 tsr = bg_ptr->conf->sensors[i].registers;
  89                 t_hot = omap_bandgap_readl(bg_ptr, tsr->bgap_status);
  90                 t_hot &= tsr->status_hot_mask;
  91
  92                 /* Read the status of t_cold */
  93                 t_cold = omap_bandgap_readl(bg_ptr, tsr->bgap_status);
  94                 t_cold &= tsr->status_cold_mask;
  95
  96                 if (!t_cold && !t_hot)
  97                         continue;
  98
  99                 ctrl = omap_bandgap_readl(bg_ptr, tsr->bgap_mask_ctrl);
 100                 /*
 101                  * One TALERT interrupt: Two sources
 102                  * If the interrupt is due to t_hot then mask t_hot and
 103                  * and unmask t_cold else mask t_cold and unmask t_hot
 104                  */
 105                 if (t_hot) {
 106                         ctrl &= ~tsr->mask_hot_mask;
 107                         ctrl |= tsr->mask_cold_mask;
 108                 } else if (t_cold) {
 109                         ctrl &= ~tsr->mask_cold_mask;
 110                         ctrl |= tsr->mask_hot_mask;
 111                 }
 112
 113                 omap_bandgap_writel(bg_ptr, ctrl, tsr->bgap_mask_ctrl);
 114
 115                 /* read temperature */
 116                 temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
 117                 temp &= tsr->bgap_dtemp_mask;
 118
 119                 /* report temperature to whom may concern */
 120                 if (bg_ptr->conf->report_temperature)
 121                         bg_ptr->conf->report_temperature(bg_ptr, i);
 122         }
 123
 124         return IRQ_HANDLED;
 125 }
 126
 127 /* This is the Tshut handler. Call it only if HAS(TSHUT) is set */
 128 static irqreturn_t omap_bandgap_tshut_irq_handler(int irq, void *data)
 129 {
 130         orderly_poweroff(true);
 131
 132         return IRQ_HANDLED;
 133 }
 134
 135 static
 136 int adc_to_temp_conversion(struct omap_bandgap *bg_ptr, int id, int adc_val,
 137                            int *t)
 138 {
 139         struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[id].ts_data;
 140
 141         /* look up for temperature in the table and return the temperature */
 142         if (adc_val < ts_data->adc_start_val || adc_val > ts_data->adc_end_val)
 143                 return -ERANGE;
 144
 145         *t = bg_ptr->conv_table[adc_val - ts_data->adc_start_val];
 146
 147         return 0;
 148 }
 149
 150 static int temp_to_adc_conversion(long temp, struct omap_bandgap *bg_ptr, int i,
 151                                   int *adc)
 152 {
 153         struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[i].ts_data;
 154         int high, low, mid;
 155
 156         low = 0;
 157         high = ts_data->adc_end_val - ts_data->adc_start_val;
 158         mid = (high + low) / 2;
 159
 160         if (temp < bg_ptr->conv_table[high] || temp > bg_ptr->conv_table[high])
 161                 return -EINVAL;
 162
 163         while (low < high) {
 164                 if (temp < bg_ptr->conv_table[mid])
 165                         high = mid - 1;
 166                 else
 167                         low = mid + 1;
 168                 mid = (low + high) / 2;
 169         }
 170
 171         *adc = ts_data->adc_start_val + low;
 172
 173         return 0;
 174 }
 175
 176 /* Talert masks. Call it only if HAS(TALERT) is set */
 177 static int temp_sensor_unmask_interrupts(struct omap_bandgap *bg_ptr, int id,
 178                                          u32 t_hot, u32 t_cold)
 179 {
 180         struct temp_sensor_registers *tsr;
 181         u32 temp, reg_val;
 182
 183         /* Read the current on die temperature */
 184         tsr = bg_ptr->conf->sensors[id].registers;
 185         temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
 186         temp &= tsr->bgap_dtemp_mask;
 187
 188         reg_val = omap_bandgap_readl(bg_ptr, tsr->bgap_mask_ctrl);
 189         if (temp < t_hot)
 190                 reg_val |= tsr->mask_hot_mask;
 191         else
 192                 reg_val &= ~tsr->mask_hot_mask;
 193
 194         if (t_cold < temp)
 195                 reg_val |= tsr->mask_cold_mask;
 196         else
 197                 reg_val &= ~tsr->mask_cold_mask;
 198         omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_mask_ctrl);
 199
 200         return 0;
 201 }
 202
 203 static
 204 int add_hyst(int adc_val, int hyst_val, struct omap_bandgap *bg_ptr, int i,
 205              u32 *sum)
 206 {
 207         int temp, ret;
 208
 209         ret = adc_to_temp_conversion(bg_ptr, i, adc_val, &temp);
 210         if (ret < 0)
 211                 return ret;
 212
 213         temp += hyst_val;
 214
 215         return temp_to_adc_conversion(temp, bg_ptr, i, sum);
 216 }
 217
 218 /* Talert Thot threshold. Call it only if HAS(TALERT) is set */
 219 static
 220 int temp_sensor_configure_thot(struct omap_bandgap *bg_ptr, int id, int t_hot)
 221 {
 222         struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[id].ts_data;
 223         struct temp_sensor_registers *tsr;
 224         u32 thresh_val, reg_val;
 225         int cold, err = 0;
 226
 227         tsr = bg_ptr->conf->sensors[id].registers;
 228
 229         /* obtain the T cold value */
 230         thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
 231         cold = (thresh_val & tsr->threshold_tcold_mask) >>
 232             __ffs(tsr->threshold_tcold_mask);
 233         if (t_hot <= cold) {
 234                 /* change the t_cold to t_hot - 5000 millidegrees */
 235                 err |= add_hyst(t_hot, -ts_data->hyst_val, bg_ptr, id, &cold);
 236                 /* write the new t_cold value */
 237                 reg_val = thresh_val & (~tsr->threshold_tcold_mask);
 238                 reg_val |= cold << __ffs(tsr->threshold_tcold_mask);
 239                 omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
 240                 thresh_val = reg_val;
 241         }
 242
 243         /* write the new t_hot value */
 244         reg_val = thresh_val & ~tsr->threshold_thot_mask;
 245         reg_val |= (t_hot << __ffs(tsr->threshold_thot_mask));
 246         omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
 247         if (err) {
 248                 dev_err(bg_ptr->dev, "failed to reprogram thot threshold\n");
 249                 return -EIO;
 250         }
 251
 252         return temp_sensor_unmask_interrupts(bg_ptr, id, t_hot, cold);
 253 }
 254
 255 /* Talert Thot and Tcold thresholds. Call it only if HAS(TALERT) is set */
 256 static
 257 int temp_sensor_init_talert_thresholds(struct omap_bandgap *bg_ptr, int id,
 258                                        int t_hot, int t_cold)
 259 {
 260         struct temp_sensor_registers *tsr;
 261         u32 reg_val, thresh_val;
 262
 263         tsr = bg_ptr->conf->sensors[id].registers;
 264         thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
 265
 266         /* write the new t_cold value */
 267         reg_val = thresh_val & ~tsr->threshold_tcold_mask;
 268         reg_val |= (t_cold << __ffs(tsr->threshold_tcold_mask));
 269         omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
 270
 271         thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
 272
 273         /* write the new t_hot value */
 274         reg_val = thresh_val & ~tsr->threshold_thot_mask;
 275         reg_val |= (t_hot << __ffs(tsr->threshold_thot_mask));
 276         omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
 277
 278         reg_val = omap_bandgap_readl(bg_ptr, tsr->bgap_mask_ctrl);
 279         reg_val |= tsr->mask_hot_mask;
 280         reg_val |= tsr->mask_cold_mask;
 281         omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_mask_ctrl);
 282
 283         return 0;
 284 }
 285
 286 /* Talert Tcold threshold. Call it only if HAS(TALERT) is set */
 287 static
 288 int temp_sensor_configure_tcold(struct omap_bandgap *bg_ptr, int id,
 289                                 int t_cold)
 290 {
 291         struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[id].ts_data;
 292         struct temp_sensor_registers *tsr;
 293         u32 thresh_val, reg_val;
 294         int hot, err = 0;
 295
 296         tsr = bg_ptr->conf->sensors[id].registers;
 297         /* obtain the T cold value */
 298         thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
 299         hot = (thresh_val & tsr->threshold_thot_mask) >>
 300             __ffs(tsr->threshold_thot_mask);
 301
 302         if (t_cold >= hot) {
 303                 /* change the t_hot to t_cold + 5000 millidegrees */
 304                 err |= add_hyst(t_cold, ts_data->hyst_val, bg_ptr, id, &hot);
 305                 /* write the new t_hot value */
 306                 reg_val = thresh_val & (~tsr->threshold_thot_mask);
 307                 reg_val |= hot << __ffs(tsr->threshold_thot_mask);
 308                 omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
 309                 thresh_val = reg_val;
 310         }
 311
 312         /* write the new t_cold value */
 313         reg_val = thresh_val & ~tsr->threshold_tcold_mask;
 314         reg_val |= (t_cold << __ffs(tsr->threshold_tcold_mask));
 315         omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
 316         if (err) {
 317                 dev_err(bg_ptr->dev, "failed to reprogram tcold threshold\n");
 318                 return -EIO;
 319         }
 320
 321         return temp_sensor_unmask_interrupts(bg_ptr, id, hot, t_cold);
 322 }
 323
 324 /* This is Tshut Thot config. Call it only if HAS(TSHUT_CONFIG) is set */
 325 static int temp_sensor_configure_tshut_hot(struct omap_bandgap *bg_ptr,
 326                                            int id, int tshut_hot)
 327 {
 328         struct temp_sensor_registers *tsr;
 329         u32 reg_val;
 330
 331         tsr = bg_ptr->conf->sensors[id].registers;
 332         reg_val = omap_bandgap_readl(bg_ptr, tsr->tshut_threshold);
 333         reg_val &= ~tsr->tshut_hot_mask;
 334         reg_val |= tshut_hot << __ffs(tsr->tshut_hot_mask);
 335         omap_bandgap_writel(bg_ptr, reg_val, tsr->tshut_threshold);
 336
 337         return 0;
 338 }
 339
 340 /* This is Tshut Tcold config. Call it only if HAS(TSHUT_CONFIG) is set */
 341 static int temp_sensor_configure_tshut_cold(struct omap_bandgap *bg_ptr,
 342                                             int id, int tshut_cold)
 343 {
 344         struct temp_sensor_registers *tsr;
 345         u32 reg_val;
 346
 347         tsr = bg_ptr->conf->sensors[id].registers;
 348         reg_val = omap_bandgap_readl(bg_ptr, tsr->tshut_threshold);
 349         reg_val &= ~tsr->tshut_cold_mask;
 350         reg_val |= tshut_cold << __ffs(tsr->tshut_cold_mask);
 351         omap_bandgap_writel(bg_ptr, reg_val, tsr->tshut_threshold);
 352
 353         return 0;
 354 }
 355
 356 /* This is counter config. Call it only if HAS(COUNTER) is set */
 357 static int configure_temp_sensor_counter(struct omap_bandgap *bg_ptr, int id,
 358                                          u32 counter)
 359 {
 360         struct temp_sensor_registers *tsr;
 361         u32 val;
 362
 363         tsr = bg_ptr->conf->sensors[id].registers;
 364         val = omap_bandgap_readl(bg_ptr, tsr->bgap_counter);
 365         val &= ~tsr->counter_mask;
 366         val |= counter << __ffs(tsr->counter_mask);
 367         omap_bandgap_writel(bg_ptr, val, tsr->bgap_counter);
 368
 369         return 0;
 370 }
 371
 372 #define bandgap_is_valid(b)                                             \
 373                         (!IS_ERR_OR_NULL(b))
 374 #define bandgap_is_valid_sensor_id(b, i)                                \
 375                         ((i) >= 0 && (i) < (b)->conf->sensor_count)
 376 static inline int omap_bandgap_validate(struct omap_bandgap *bg_ptr, int id)
 377 {
 378         if (!bandgap_is_valid(bg_ptr)) {
 379                 pr_err("%s: invalid bandgap pointer\n", __func__);
 380                 return -EINVAL;
 381         }
 382
 383         if (!bandgap_is_valid_sensor_id(bg_ptr, id)) {
 384                 dev_err(bg_ptr->dev, "%s: sensor id out of range (%d)\n",
 385                         __func__, id);
 386                 return -ERANGE;
 387         }
 388
 389         return 0;
 390 }
 391
 392 /* Exposed APIs */
 393 /**
 394  * omap_bandgap_read_thot() - reads sensor current thot
 395  * @bg_ptr - pointer to bandgap instance
 396  * @id - sensor id
 397  * @thot - resulting current thot value
 398  *
 399  * returns 0 on success or the proper error code
 400  */
 401 int omap_bandgap_read_thot(struct omap_bandgap *bg_ptr, int id,
 402                               int *thot)
 403 {
 404         struct temp_sensor_registers *tsr;
 405         u32 temp;
 406         int ret;
 407
 408         ret = omap_bandgap_validate(bg_ptr, id);
 409         if (ret)
 410                 return ret;
 411
 412         if (!OMAP_BANDGAP_HAS(bg_ptr, TALERT))
 413                 return -ENOTSUPP;
 414
 415         tsr = bg_ptr->conf->sensors[id].registers;
 416         temp = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
 417         temp = (temp & tsr->threshold_thot_mask) >>
 418                 __ffs(tsr->threshold_thot_mask);
 419         ret |= adc_to_temp_conversion(bg_ptr, id, temp, &temp);
 420         if (ret) {
 421                 dev_err(bg_ptr->dev, "failed to read thot\n");
 422                 return -EIO;
 423         }
 424
 425         *thot = temp;
 426
 427         return 0;
 428 }
 429
 430 /**
 431  * omap_bandgap_write_thot() - sets sensor current thot
 432  * @bg_ptr - pointer to bandgap instance
 433  * @id - sensor id
 434  * @val - desired thot value
 435  *
 436  * returns 0 on success or the proper error code
 437  */
 438 int omap_bandgap_write_thot(struct omap_bandgap *bg_ptr, int id, int val)
 439 {
 440         struct temp_sensor_data *ts_data;
 441         struct temp_sensor_registers *tsr;
 442         u32 t_hot;
 443         int ret;
 444
 445         ret = omap_bandgap_validate(bg_ptr, id);
 446         if (ret)
 447                 return ret;
 448
 449         if (!OMAP_BANDGAP_HAS(bg_ptr, TALERT))
 450                 return -ENOTSUPP;
 451
 452         ts_data = bg_ptr->conf->sensors[id].ts_data;
 453         tsr = bg_ptr->conf->sensors[id].registers;
 454
 455         if (val < ts_data->min_temp + ts_data->hyst_val)
 456                 return -EINVAL;
 457         ret = temp_to_adc_conversion(val, bg_ptr, id, &t_hot);
 458         if (ret < 0)
 459                 return ret;
 460
 461         mutex_lock(&bg_ptr->bg_mutex);
 462         temp_sensor_configure_thot(bg_ptr, id, t_hot);
 463         mutex_unlock(&bg_ptr->bg_mutex);
 464
 465         return 0;
 466 }
 467
 468 /**
 469  * omap_bandgap_read_tcold() - reads sensor current tcold
 470  * @bg_ptr - pointer to bandgap instance
 471  * @id - sensor id
 472  * @tcold - resulting current tcold value
 473  *
 474  * returns 0 on success or the proper error code
 475  */
 476 int omap_bandgap_read_tcold(struct omap_bandgap *bg_ptr, int id,
 477                                int *tcold)
 478 {
 479         struct temp_sensor_registers *tsr;
 480         u32 temp;
 481         int ret;
 482
 483         ret = omap_bandgap_validate(bg_ptr, id);
 484         if (ret)
 485                 return ret;
 486
 487         if (!OMAP_BANDGAP_HAS(bg_ptr, TALERT))
 488                 return -ENOTSUPP;
 489
 490         tsr = bg_ptr->conf->sensors[id].registers;
 491         temp = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
 492         temp = (temp & tsr->threshold_tcold_mask)
 493             >> __ffs(tsr->threshold_tcold_mask);
 494         ret |= adc_to_temp_conversion(bg_ptr, id, temp, &temp);
 495         if (ret)
 496                 return -EIO;
 497
 498         *tcold = temp;
 499
 500         return 0;
 501 }
 502
 503 /**
 504  * omap_bandgap_write_tcold() - sets the sensor tcold
 505  * @bg_ptr - pointer to bandgap instance
 506  * @id - sensor id
 507  * @val - desired tcold value
 508  *
 509  * returns 0 on success or the proper error code
 510  */
 511 int omap_bandgap_write_tcold(struct omap_bandgap *bg_ptr, int id, int val)
 512 {
 513         struct temp_sensor_data *ts_data;
 514         struct temp_sensor_registers *tsr;
 515         u32 t_cold;
 516         int ret;
 517
 518         ret = omap_bandgap_validate(bg_ptr, id);
 519         if (ret)
 520                 return ret;
 521
 522         if (!OMAP_BANDGAP_HAS(bg_ptr, TALERT))
 523                 return -ENOTSUPP;
 524
 525         ts_data = bg_ptr->conf->sensors[id].ts_data;
 526         tsr = bg_ptr->conf->sensors[id].registers;
 527         if (val > ts_data->max_temp + ts_data->hyst_val)
 528                 return -EINVAL;
 529
 530         ret = temp_to_adc_conversion(val, bg_ptr, id, &t_cold);
 531         if (ret < 0)
 532                 return ret;
 533
 534         mutex_lock(&bg_ptr->bg_mutex);
 535         temp_sensor_configure_tcold(bg_ptr, id, t_cold);
 536         mutex_unlock(&bg_ptr->bg_mutex);
 537
 538         return 0;
 539 }
 540
 541 /**
 542  * omap_bandgap_read_update_interval() - read the sensor update interval
 543  * @bg_ptr - pointer to bandgap instance
 544  * @id - sensor id
 545  * @interval - resulting update interval in miliseconds
 546  *
 547  * returns 0 on success or the proper error code
 548  */
 549 int omap_bandgap_read_update_interval(struct omap_bandgap *bg_ptr, int id,
 550                                          int *interval)
 551 {
 552         struct temp_sensor_registers *tsr;
 553         u32 time;
 554         int ret;
 555
 556         ret = omap_bandgap_validate(bg_ptr, id);
 557         if (ret)
 558                 return ret;
 559
 560         if (!OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
 561                 return -ENOTSUPP;
 562
 563         tsr = bg_ptr->conf->sensors[id].registers;
 564         time = omap_bandgap_readl(bg_ptr, tsr->bgap_counter);
 565         if (ret)
 566                 return ret;
 567         time = (time & tsr->counter_mask) >> __ffs(tsr->counter_mask);
 568         time = time * 1000 / bg_ptr->clk_rate;
 569
 570         *interval = time;
 571
 572         return 0;
 573 }
 574
 575 /**
 576  * omap_bandgap_write_update_interval() - set the update interval
 577  * @bg_ptr - pointer to bandgap instance
 578  * @id - sensor id
 579  * @interval - desired update interval in miliseconds
 580  *
 581  * returns 0 on success or the proper error code
 582  */
 583 int omap_bandgap_write_update_interval(struct omap_bandgap *bg_ptr,
 584                                           int id, u32 interval)
 585 {
 586         int ret = omap_bandgap_validate(bg_ptr, id);
 587         if (ret)
 588                 return ret;
 589
 590         if (!OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
 591                 return -ENOTSUPP;
 592
 593         interval = interval * bg_ptr->clk_rate / 1000;
 594         mutex_lock(&bg_ptr->bg_mutex);
 595         configure_temp_sensor_counter(bg_ptr, id, interval);
 596         mutex_unlock(&bg_ptr->bg_mutex);
 597
 598         return 0;
 599 }
 600
 601 /**
 602  * omap_bandgap_read_temperature() - report current temperature
 603  * @bg_ptr - pointer to bandgap instance
 604  * @id - sensor id
 605  * @temperature - resulting temperature
 606  *
 607  * returns 0 on success or the proper error code
 608  */
 609 int omap_bandgap_read_temperature(struct omap_bandgap *bg_ptr, int id,
 610                                      int *temperature)
 611 {
 612         struct temp_sensor_registers *tsr;
 613         u32 temp;
 614         int ret;
 615
 616         ret = omap_bandgap_validate(bg_ptr, id);
 617         if (ret)
 618                 return ret;
 619
 620         tsr = bg_ptr->conf->sensors[id].registers;
 621         temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
 622         temp &= tsr->bgap_dtemp_mask;
 623
 624         ret |= adc_to_temp_conversion(bg_ptr, id, temp, &temp);
 625         if (ret)
 626                 return -EIO;
 627
 628         *temperature = temp;
 629
 630         return 0;
 631 }
 632
 633 /**
 634  * omap_bandgap_set_sensor_data() - helper function to store thermal
 635  * framework related data.
 636  * @bg_ptr - pointer to bandgap instance
 637  * @id - sensor id
 638  * @data - thermal framework related data to be stored
 639  *
 640  * returns 0 on success or the proper error code
 641  */
 642 int omap_bandgap_set_sensor_data(struct omap_bandgap *bg_ptr, int id,
 643                                 void *data)
 644 {
 645         int ret = omap_bandgap_validate(bg_ptr, id);
 646         if (ret)
 647                 return ret;
 648
 649         bg_ptr->conf->sensors[id].data = data;
 650
 651         return 0;
 652 }
 653
 654 /**
 655  * omap_bandgap_get_sensor_data() - helper function to get thermal
 656  * framework related data.
 657  * @bg_ptr - pointer to bandgap instance
 658  * @id - sensor id
 659  *
 660  * returns data stored by set function with sensor id on success or NULL
 661  */
 662 void *omap_bandgap_get_sensor_data(struct omap_bandgap *bg_ptr, int id)
 663 {
 664         int ret = omap_bandgap_validate(bg_ptr, id);
 665         if (ret)
 666                 return ERR_PTR(ret);
 667
 668         return bg_ptr->conf->sensors[id].data;
 669 }
 670
 671 static int
 672 omap_bandgap_force_single_read(struct omap_bandgap *bg_ptr, int id)
 673 {
 674         struct temp_sensor_registers *tsr;
 675         u32 temp = 0, counter = 1000;
 676
 677         tsr = bg_ptr->conf->sensors[id].registers;
 678         /* Select single conversion mode */
 679         if (OMAP_BANDGAP_HAS(bg_ptr, MODE_CONFIG)) {
 680                 temp = omap_bandgap_readl(bg_ptr, tsr->bgap_mode_ctrl);
 681                 temp &= ~(1 << __ffs(tsr->mode_ctrl_mask));
 682                 omap_bandgap_writel(bg_ptr, temp, tsr->bgap_mode_ctrl);
 683         }
 684
 685         /* Start of Conversion = 1 */
 686         temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
 687         temp |= 1 << __ffs(tsr->bgap_soc_mask);
 688         omap_bandgap_writel(bg_ptr, temp, tsr->temp_sensor_ctrl);
 689         /* Wait until DTEMP is updated */
 690         temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
 691         temp &= (tsr->bgap_dtemp_mask);
 692         while ((temp == 0) && --counter) {
 693                 temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
 694                 temp &= (tsr->bgap_dtemp_mask);
 695         }
 696         /* Start of Conversion = 0 */
 697         temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
 698         temp &= ~(1 << __ffs(tsr->bgap_soc_mask));
 699         omap_bandgap_writel(bg_ptr, temp, tsr->temp_sensor_ctrl);
 700
 701         return 0;
 702 }
 703
 704 /**
 705  * enable_continuous_mode() - One time enabling of continuous conversion mode
 706  * @bg_ptr - pointer to scm instance
 707  *
 708  * Call this function only if HAS(MODE_CONFIG) is set
 709  */
 710 static int enable_continuous_mode(struct omap_bandgap *bg_ptr)
 711 {
 712         struct temp_sensor_registers *tsr;
 713         int i;
 714         u32 val;
 715
 716         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
 717                 /* Perform a single read just before enabling continuous */
 718                 omap_bandgap_force_single_read(bg_ptr, i);
 719                 tsr = bg_ptr->conf->sensors[i].registers;
 720                 val = omap_bandgap_readl(bg_ptr, tsr->bgap_mode_ctrl);
 721                 val |= 1 << __ffs(tsr->mode_ctrl_mask);
 722                 omap_bandgap_writel(bg_ptr, val, tsr->bgap_mode_ctrl);
 723         }
 724
 725         return 0;
 726 }
 727
 728 static int omap_bandgap_tshut_init(struct omap_bandgap *bg_ptr,
 729                                       struct platform_device *pdev)
 730 {
 731         int gpio_nr = bg_ptr->tshut_gpio;
 732         int status;
 733
 734         /* Request for gpio_86 line */
 735         status = gpio_request(gpio_nr, "tshut");
 736         if (status < 0) {
 737                 dev_err(bg_ptr->dev,
 738                         "Could not request for TSHUT GPIO:%i\n", 86);
 739                 return status;
 740         }
 741         status = gpio_direction_input(gpio_nr);
 742         if (status) {
 743                 dev_err(bg_ptr->dev,
 744                         "Cannot set input TSHUT GPIO %d\n", gpio_nr);
 745                 return status;
 746         }
 747
 748         status = request_irq(gpio_to_irq(gpio_nr),
 749                              omap_bandgap_tshut_irq_handler,
 750                              IRQF_TRIGGER_RISING, "tshut",
 751                              NULL);
 752         if (status) {
 753                 gpio_free(gpio_nr);
 754                 dev_err(bg_ptr->dev, "request irq failed for TSHUT");
 755         }
 756
 757         return 0;
 758 }
 759
 760 /* Initialization of Talert. Call it only if HAS(TALERT) is set */
 761 static int omap_bandgap_talert_init(struct omap_bandgap *bg_ptr,
 762                                        struct platform_device *pdev)
 763 {
 764         int ret;
 765
 766         bg_ptr->irq = platform_get_irq(pdev, 0);
 767         if (bg_ptr->irq < 0) {
 768                 dev_err(&pdev->dev, "get_irq failed\n");
 769                 return bg_ptr->irq;
 770         }
 771         ret = request_threaded_irq(bg_ptr->irq, NULL,
 772                                    talert_irq_handler,
 773                                    IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
 774                                    "talert", bg_ptr);
 775         if (ret) {
 776                 dev_err(&pdev->dev, "Request threaded irq failed.\n");
 777                 return ret;
 778         }
 779
 780         return 0;
 781 }
 782
 783 static const struct of_device_id of_omap_bandgap_match[];
 784 static struct omap_bandgap *omap_bandgap_build(struct platform_device *pdev)
 785 {
 786         struct device_node *node = pdev->dev.of_node;
 787         const struct of_device_id *of_id;
 788         struct omap_bandgap *bg_ptr;
 789         struct resource *res;
 790         u32 prop;
 791         int i;
 792
 793         /* just for the sake */
 794         if (!node) {
 795                 dev_err(&pdev->dev, "no platform information available\n");
 796                 return ERR_PTR(-EINVAL);
 797         }
 798
 799         bg_ptr = devm_kzalloc(&pdev->dev, sizeof(struct omap_bandgap),
 800                                     GFP_KERNEL);
 801         if (!bg_ptr) {
 802                 dev_err(&pdev->dev, "Unable to allocate mem for driver ref\n");
 803                 return ERR_PTR(-ENOMEM);
 804         }
 805
 806         of_id = of_match_device(of_omap_bandgap_match, &pdev->dev);
 807         if (of_id)
 808                 bg_ptr->conf = of_id->data;
 809
 810         i = 0;
 811         do {
 812                 void __iomem *chunk;
 813
 814                 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
 815                 if (!res)
 816                         break;
 817                 chunk = devm_request_and_ioremap(&pdev->dev, res);
 818                 if (i == 0)
 819                         bg_ptr->base = chunk;
 820                 if (!chunk) {
 821                         dev_err(&pdev->dev,
 822                                 "failed to request the IO (%d:%pR).\n",
 823                                 i, res);
 824                         return ERR_PTR(-EADDRNOTAVAIL);
 825                 }
 826                 i++;
 827         } while (res);
 828
 829         if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT)) {
 830                 if (of_property_read_u32(node, "ti,tshut-gpio", &prop) < 0) {
 831                         dev_err(&pdev->dev, "missing tshut gpio in device tree\n");
 832                         return ERR_PTR(-EINVAL);
 833                 }
 834                 bg_ptr->tshut_gpio = prop;
 835                 if (!gpio_is_valid(bg_ptr->tshut_gpio)) {
 836                         dev_err(&pdev->dev, "invalid gpio for tshut (%d)\n",
 837                                 bg_ptr->tshut_gpio);
 838                         return ERR_PTR(-EINVAL);
 839                 }
 840         }
 841
 842         return bg_ptr;
 843 }
 844
 845 static
 846 int __devinit omap_bandgap_probe(struct platform_device *pdev)
 847 {
 848         struct omap_bandgap *bg_ptr;
 849         int clk_rate, ret = 0, i;
 850
 851         bg_ptr = omap_bandgap_build(pdev);
 852         if (IS_ERR_OR_NULL(bg_ptr)) {
 853                 dev_err(&pdev->dev, "failed to fetch platform data\n");
 854                 return PTR_ERR(bg_ptr);
 855         }
 856         bg_ptr->dev = &pdev->dev;
 857
 858         if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT)) {
 859                 ret = omap_bandgap_tshut_init(bg_ptr, pdev);
 860                 if (ret) {
 861                         dev_err(&pdev->dev,
 862                                 "failed to initialize system tshut IRQ\n");
 863                         return ret;
 864                 }
 865         }
 866
 867         bg_ptr->fclock = clk_get(NULL, bg_ptr->conf->fclock_name);
 868         ret = IS_ERR_OR_NULL(bg_ptr->fclock);
 869         if (ret) {
 870                 dev_err(&pdev->dev, "failed to request fclock reference\n");
 871                 goto free_irqs;
 872         }
 873
 874         bg_ptr->div_clk = clk_get(NULL,  bg_ptr->conf->div_ck_name);
 875         ret = IS_ERR_OR_NULL(bg_ptr->div_clk);
 876         if (ret) {
 877                 dev_err(&pdev->dev,
 878                         "failed to request div_ts_ck clock ref\n");
 879                 goto free_irqs;
 880         }
 881
 882         bg_ptr->conv_table = bg_ptr->conf->conv_table;
 883         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
 884                 struct temp_sensor_registers *tsr;
 885                 u32 val;
 886
 887                 tsr = bg_ptr->conf->sensors[i].registers;
 888                 /*
 889                  * check if the efuse has a non-zero value if not
 890                  * it is an untrimmed sample and the temperatures
 891                  * may not be accurate
 892                  */
 893                 val = omap_bandgap_readl(bg_ptr, tsr->bgap_efuse);
 894                 if (ret || !val)
 895                         dev_info(&pdev->dev,
 896                                  "Non-trimmed BGAP, Temp not accurate\n");
 897         }
 898
 899         clk_rate = clk_round_rate(bg_ptr->div_clk,
 900                                   bg_ptr->conf->sensors[0].ts_data->max_freq);
 901         if (clk_rate < bg_ptr->conf->sensors[0].ts_data->min_freq ||
 902             clk_rate == 0xffffffff) {
 903                 ret = -ENODEV;
 904                 dev_err(&pdev->dev, "wrong clock rate (%d)\n", clk_rate);
 905                 goto put_clks;
 906         }
 907
 908         ret = clk_set_rate(bg_ptr->div_clk, clk_rate);
 909         if (ret)
 910                 dev_err(&pdev->dev, "Cannot re-set clock rate. Continuing\n");
 911
 912         bg_ptr->clk_rate = clk_rate;
 913         clk_enable(bg_ptr->fclock);
 914
 915         mutex_init(&bg_ptr->bg_mutex);
 916         bg_ptr->dev = &pdev->dev;
 917         platform_set_drvdata(pdev, bg_ptr);
 918
 919         omap_bandgap_power(bg_ptr, true);
 920
 921         /* Set default counter to 1 for now */
 922         if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
 923                 for (i = 0; i < bg_ptr->conf->sensor_count; i++)
 924                         configure_temp_sensor_counter(bg_ptr, i, 1);
 925
 926         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
 927                 struct temp_sensor_data *ts_data;
 928
 929                 ts_data = bg_ptr->conf->sensors[i].ts_data;
 930
 931                 if (OMAP_BANDGAP_HAS(bg_ptr, TALERT))
 932                         temp_sensor_init_talert_thresholds(bg_ptr, i,
 933                                                            ts_data->t_hot,
 934                                                            ts_data->t_cold);
 935                 if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT_CONFIG)) {
 936                         temp_sensor_configure_tshut_hot(bg_ptr, i,
 937                                                         ts_data->tshut_hot);
 938                         temp_sensor_configure_tshut_cold(bg_ptr, i,
 939                                                          ts_data->tshut_cold);
 940                 }
 941         }
 942
 943         if (OMAP_BANDGAP_HAS(bg_ptr, MODE_CONFIG))
 944                 enable_continuous_mode(bg_ptr);
 945
 946         /* Set .250 seconds time as default counter */
 947         if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
 948                 for (i = 0; i < bg_ptr->conf->sensor_count; i++)
 949                         configure_temp_sensor_counter(bg_ptr, i,
 950                                                       bg_ptr->clk_rate / 4);
 951
 952         /* Every thing is good? Then expose the sensors */
 953         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
 954                 char *domain;
 955
 956                 domain = bg_ptr->conf->sensors[i].domain;
 957                 if (bg_ptr->conf->expose_sensor)
 958                         bg_ptr->conf->expose_sensor(bg_ptr, i, domain);
 959
 960                 if (bg_ptr->conf->sensors[i].register_cooling)
 961                         bg_ptr->conf->sensors[i].register_cooling(bg_ptr, i);
 962         }
 963
 964         /*
 965          * Enable the Interrupts once everything is set. Otherwise irq handler
 966          * might be called as soon as it is enabled where as rest of framework
 967          * is still getting initialised.
 968          */
 969         if (OMAP_BANDGAP_HAS(bg_ptr, TALERT)) {
 970                 ret = omap_bandgap_talert_init(bg_ptr, pdev);
 971                 if (ret) {
 972                         dev_err(&pdev->dev, "failed to initialize Talert IRQ\n");
 973                         i = bg_ptr->conf->sensor_count;
 974                         goto disable_clk;
 975                 }
 976         }
 977
 978         return 0;
 979
 980 disable_clk:
 981         clk_disable(bg_ptr->fclock);
 982 put_clks:
 983         clk_put(bg_ptr->fclock);
 984         clk_put(bg_ptr->div_clk);
 985 free_irqs:
 986         if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT)) {
 987                 free_irq(gpio_to_irq(bg_ptr->tshut_gpio), NULL);
 988                 gpio_free(bg_ptr->tshut_gpio);
 989         }
 990
 991         return ret;
 992 }
 993
 994 static
 995 int __devexit omap_bandgap_remove(struct platform_device *pdev)
 996 {
 997         struct omap_bandgap *bg_ptr = platform_get_drvdata(pdev);
 998         int i;
 999
1000         /* First thing is to remove sensor interfaces */
1001         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
1002                 if (bg_ptr->conf->sensors[i].register_cooling)
1003                         bg_ptr->conf->sensors[i].unregister_cooling(bg_ptr, i);
1004
1005                 if (bg_ptr->conf->remove_sensor)
1006                         bg_ptr->conf->remove_sensor(bg_ptr, i);
1007         }
1008
1009         omap_bandgap_power(bg_ptr, false);
1010
1011         clk_disable(bg_ptr->fclock);
1012         clk_put(bg_ptr->fclock);
1013         clk_put(bg_ptr->div_clk);
1014
1015         if (OMAP_BANDGAP_HAS(bg_ptr, TALERT))
1016                 free_irq(bg_ptr->irq, bg_ptr);
1017
1018         if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT)) {
1019                 free_irq(gpio_to_irq(bg_ptr->tshut_gpio), NULL);
1020                 gpio_free(bg_ptr->tshut_gpio);
1021         }
1022
1023         return 0;
1024 }
1025
1026 #ifdef CONFIG_PM
1027 static int omap_bandgap_save_ctxt(struct omap_bandgap *bg_ptr)
1028 {
1029         int i;
1030
1031         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
1032                 struct temp_sensor_registers *tsr;
1033                 struct temp_sensor_regval *rval;
1034
1035                 rval = &bg_ptr->conf->sensors[i].regval;
1036                 tsr = bg_ptr->conf->sensors[i].registers;
1037
1038                 if (OMAP_BANDGAP_HAS(bg_ptr, MODE_CONFIG))
1039                         rval->bg_mode_ctrl = omap_bandgap_readl(bg_ptr,
1040                                                                 tsr->bgap_mode_ctrl);
1041                 if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
1042                         rval->bg_counter = omap_bandgap_readl(bg_ptr,
1043                                                               tsr->bgap_counter);
1044                 if (OMAP_BANDGAP_HAS(bg_ptr, TALERT)) {
1045                         rval->bg_threshold = omap_bandgap_readl(bg_ptr,
1046                                                                 tsr->bgap_threshold);
1047                         rval->bg_ctrl = omap_bandgap_readl(bg_ptr,
1048                                                            tsr->bgap_mask_ctrl);
1049                 }
1050
1051                 if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT_CONFIG))
1052                         rval->tshut_threshold = omap_bandgap_readl(bg_ptr,
1053                                                                    tsr->tshut_threshold);
1054         }
1055
1056         return 0;
1057 }
1058
1059 static int omap_bandgap_restore_ctxt(struct omap_bandgap *bg_ptr)
1060 {
1061         int i;
1062         u32 temp = 0;
1063
1064         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
1065                 struct temp_sensor_registers *tsr;
1066                 struct temp_sensor_regval *rval;
1067                 u32 val = 0;
1068
1069                 rval = &bg_ptr->conf->sensors[i].regval;
1070                 tsr = bg_ptr->conf->sensors[i].registers;
1071
1072                 if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
1073                         val = omap_bandgap_readl(bg_ptr, tsr->bgap_counter);
1074
1075                 if (val == 0) {
1076                         if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT_CONFIG))
1077                                 omap_bandgap_writel(bg_ptr, rval->tshut_threshold,
1078                                                            tsr->tshut_threshold);
1079                         /* Force immediate temperature measurement and update
1080                          * of the DTEMP field
1081                          */
1082                         omap_bandgap_force_single_read(bg_ptr, i);
1083
1084                         if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
1085                                 omap_bandgap_writel(bg_ptr, rval->bg_counter,
1086                                                            tsr->bgap_counter);
1087                         if (OMAP_BANDGAP_HAS(bg_ptr, MODE_CONFIG))
1088                                 omap_bandgap_writel(bg_ptr, rval->bg_mode_ctrl,
1089                                                            tsr->bgap_mode_ctrl);
1090                         if (OMAP_BANDGAP_HAS(bg_ptr, TALERT)) {
1091                                 omap_bandgap_writel(bg_ptr,
1092                                                            rval->bg_threshold,
1093                                                            tsr->bgap_threshold);
1094                                 omap_bandgap_writel(bg_ptr, rval->bg_ctrl,
1095                                                            tsr->bgap_mask_ctrl);
1096                         }
1097                 } else {
1098                         temp = omap_bandgap_readl(bg_ptr,
1099                                                   tsr->temp_sensor_ctrl);
1100                         temp &= (tsr->bgap_dtemp_mask);
1101                         omap_bandgap_force_single_read(bg_ptr, i);
1102                         if (temp == 0 && OMAP_BANDGAP_HAS(bg_ptr, TALERT)) {
1103                                 temp = omap_bandgap_readl(bg_ptr,
1104                                                           tsr->bgap_mask_ctrl);
1105                                 temp |= 1 << __ffs(tsr->mode_ctrl_mask);
1106                                 omap_bandgap_writel(bg_ptr, temp,
1107                                                            tsr->bgap_mask_ctrl);
1108                         }
1109                 }
1110         }
1111
1112         return 0;
1113 }
1114
1115 static int omap_bandgap_suspend(struct device *dev)
1116 {
1117         struct omap_bandgap *bg_ptr = dev_get_drvdata(dev);
1118         int err;
1119
1120         err = omap_bandgap_save_ctxt(bg_ptr);
1121         omap_bandgap_power(bg_ptr, false);
1122         clk_disable(bg_ptr->fclock);
1123
1124         return err;
1125 }
1126
1127 static int omap_bandgap_resume(struct device *dev)
1128 {
1129         struct omap_bandgap *bg_ptr = dev_get_drvdata(dev);
1130
1131         clk_enable(bg_ptr->fclock);
1132         omap_bandgap_power(bg_ptr, true);
1133
1134         return omap_bandgap_restore_ctxt(bg_ptr);
1135 }
1136 static const struct dev_pm_ops omap_bandgap_dev_pm_ops = {
1137         SET_SYSTEM_SLEEP_PM_OPS(omap_bandgap_suspend,
1138                                 omap_bandgap_resume)
1139 };
1140
1141 #define DEV_PM_OPS      (&omap_bandgap_dev_pm_ops)
1142 #else
1143 #define DEV_PM_OPS      NULL
1144 #endif
1145
1146 static const struct of_device_id of_omap_bandgap_match[] = {
1147 #ifdef CONFIG_OMAP4_THERMAL
1148         {
1149                 .compatible = "ti,omap4430-bandgap",
1150                 .data = (void *)&omap4430_data,
1151         },
1152         {
1153                 .compatible = "ti,omap4460-bandgap",
1154                 .data = (void *)&omap4460_data,
1155         },
1156         {
1157                 .compatible = "ti,omap4470-bandgap",
1158                 .data = (void *)&omap4470_data,
1159         },
1160 #endif
1161         /* Sentinel */
1162         { },
1163 };
1164 MODULE_DEVICE_TABLE(of, of_omap_bandgap_match);
1165
1166 static struct platform_driver omap_bandgap_sensor_driver = {
1167         .probe = omap_bandgap_probe,
1168         .remove = omap_bandgap_remove,
1169         .driver = {
1170                         .name = "omap-bandgap",
1171                         .pm = DEV_PM_OPS,
1172                         .of_match_table = of_omap_bandgap_match,
1173         },
1174 };
1175
1176 module_platform_driver(omap_bandgap_sensor_driver);
1177
1178 MODULE_DESCRIPTION("OMAP4+ bandgap temperature sensor driver");
1179 MODULE_LICENSE("GPL v2");
1180 MODULE_ALIAS("platform:omap-bandgap");
1181 MODULE_AUTHOR("Texas Instrument Inc.");