Version:  2.6.34 2.6.35 2.6.36 2.6.37 2.6.38 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14

Linux/drivers/power/ab8500_btemp.c

  1 /*
  2  * Copyright (C) ST-Ericsson SA 2012
  3  *
  4  * Battery temperature driver for AB8500
  5  *
  6  * License Terms: GNU General Public License v2
  7  * Author:
  8  *      Johan Palsson <johan.palsson@stericsson.com>
  9  *      Karl Komierowski <karl.komierowski@stericsson.com>
 10  *      Arun R Murthy <arun.murthy@stericsson.com>
 11  */
 12 
 13 #include <linux/init.h>
 14 #include <linux/module.h>
 15 #include <linux/device.h>
 16 #include <linux/interrupt.h>
 17 #include <linux/delay.h>
 18 #include <linux/slab.h>
 19 #include <linux/platform_device.h>
 20 #include <linux/power_supply.h>
 21 #include <linux/completion.h>
 22 #include <linux/workqueue.h>
 23 #include <linux/jiffies.h>
 24 #include <linux/of.h>
 25 #include <linux/mfd/core.h>
 26 #include <linux/mfd/abx500.h>
 27 #include <linux/mfd/abx500/ab8500.h>
 28 #include <linux/mfd/abx500/ab8500-bm.h>
 29 #include <linux/mfd/abx500/ab8500-gpadc.h>
 30 
 31 #define VTVOUT_V                        1800
 32 
 33 #define BTEMP_THERMAL_LOW_LIMIT         -10
 34 #define BTEMP_THERMAL_MED_LIMIT         0
 35 #define BTEMP_THERMAL_HIGH_LIMIT_52     52
 36 #define BTEMP_THERMAL_HIGH_LIMIT_57     57
 37 #define BTEMP_THERMAL_HIGH_LIMIT_62     62
 38 
 39 #define BTEMP_BATCTRL_CURR_SRC_7UA      7
 40 #define BTEMP_BATCTRL_CURR_SRC_20UA     20
 41 
 42 #define BTEMP_BATCTRL_CURR_SRC_16UA     16
 43 #define BTEMP_BATCTRL_CURR_SRC_18UA     18
 44 
 45 #define BTEMP_BATCTRL_CURR_SRC_60UA     60
 46 #define BTEMP_BATCTRL_CURR_SRC_120UA    120
 47 
 48 #define to_ab8500_btemp_device_info(x) container_of((x), \
 49         struct ab8500_btemp, btemp_psy);
 50 
 51 /**
 52  * struct ab8500_btemp_interrupts - ab8500 interrupts
 53  * @name:       name of the interrupt
 54  * @isr         function pointer to the isr
 55  */
 56 struct ab8500_btemp_interrupts {
 57         char *name;
 58         irqreturn_t (*isr)(int irq, void *data);
 59 };
 60 
 61 struct ab8500_btemp_events {
 62         bool batt_rem;
 63         bool btemp_high;
 64         bool btemp_medhigh;
 65         bool btemp_lowmed;
 66         bool btemp_low;
 67         bool ac_conn;
 68         bool usb_conn;
 69 };
 70 
 71 struct ab8500_btemp_ranges {
 72         int btemp_high_limit;
 73         int btemp_med_limit;
 74         int btemp_low_limit;
 75 };
 76 
 77 /**
 78  * struct ab8500_btemp - ab8500 BTEMP device information
 79  * @dev:                Pointer to the structure device
 80  * @node:               List of AB8500 BTEMPs, hence prepared for reentrance
 81  * @curr_source:        What current source we use, in uA
 82  * @bat_temp:           Dispatched battery temperature in degree Celcius
 83  * @prev_bat_temp       Last measured battery temperature in degree Celcius
 84  * @parent:             Pointer to the struct ab8500
 85  * @gpadc:              Pointer to the struct gpadc
 86  * @fg:                 Pointer to the struct fg
 87  * @bm:                 Platform specific battery management information
 88  * @btemp_psy:          Structure for BTEMP specific battery properties
 89  * @events:             Structure for information about events triggered
 90  * @btemp_ranges:       Battery temperature range structure
 91  * @btemp_wq:           Work queue for measuring the temperature periodically
 92  * @btemp_periodic_work:        Work for measuring the temperature periodically
 93  * @initialized:        True if battery id read.
 94  */
 95 struct ab8500_btemp {
 96         struct device *dev;
 97         struct list_head node;
 98         int curr_source;
 99         int bat_temp;
100         int prev_bat_temp;
101         struct ab8500 *parent;
102         struct ab8500_gpadc *gpadc;
103         struct ab8500_fg *fg;
104         struct abx500_bm_data *bm;
105         struct power_supply btemp_psy;
106         struct ab8500_btemp_events events;
107         struct ab8500_btemp_ranges btemp_ranges;
108         struct workqueue_struct *btemp_wq;
109         struct delayed_work btemp_periodic_work;
110         bool initialized;
111 };
112 
113 /* BTEMP power supply properties */
114 static enum power_supply_property ab8500_btemp_props[] = {
115         POWER_SUPPLY_PROP_PRESENT,
116         POWER_SUPPLY_PROP_ONLINE,
117         POWER_SUPPLY_PROP_TECHNOLOGY,
118         POWER_SUPPLY_PROP_TEMP,
119 };
120 
121 static LIST_HEAD(ab8500_btemp_list);
122 
123 /**
124  * ab8500_btemp_get() - returns a reference to the primary AB8500 BTEMP
125  * (i.e. the first BTEMP in the instance list)
126  */
127 struct ab8500_btemp *ab8500_btemp_get(void)
128 {
129         struct ab8500_btemp *btemp;
130         btemp = list_first_entry(&ab8500_btemp_list, struct ab8500_btemp, node);
131 
132         return btemp;
133 }
134 EXPORT_SYMBOL(ab8500_btemp_get);
135 
136 /**
137  * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
138  * @di:         pointer to the ab8500_btemp structure
139  * @v_batctrl:  measured batctrl voltage
140  * @inst_curr:  measured instant current
141  *
142  * This function returns the battery resistance that is
143  * derived from the BATCTRL voltage.
144  * Returns value in Ohms.
145  */
146 static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
147         int v_batctrl, int inst_curr)
148 {
149         int rbs;
150 
151         if (is_ab8500_1p1_or_earlier(di->parent)) {
152                 /*
153                  * For ABB cut1.0 and 1.1 BAT_CTRL is internally
154                  * connected to 1.8V through a 450k resistor
155                  */
156                 return (450000 * (v_batctrl)) / (1800 - v_batctrl);
157         }
158 
159         if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL) {
160                 /*
161                  * If the battery has internal NTC, we use the current
162                  * source to calculate the resistance.
163                  */
164                 rbs = (v_batctrl * 1000
165                        - di->bm->gnd_lift_resistance * inst_curr)
166                       / di->curr_source;
167         } else {
168                 /*
169                  * BAT_CTRL is internally
170                  * connected to 1.8V through a 80k resistor
171                  */
172                 rbs = (80000 * (v_batctrl)) / (1800 - v_batctrl);
173         }
174 
175         return rbs;
176 }
177 
178 /**
179  * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
180  * @di:         pointer to the ab8500_btemp structure
181  *
182  * This function returns the voltage on BATCTRL. Returns value in mV.
183  */
184 static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
185 {
186         int vbtemp;
187         static int prev;
188 
189         vbtemp = ab8500_gpadc_convert(di->gpadc, BAT_CTRL);
190         if (vbtemp < 0) {
191                 dev_err(di->dev,
192                         "%s gpadc conversion failed, using previous value",
193                         __func__);
194                 return prev;
195         }
196         prev = vbtemp;
197         return vbtemp;
198 }
199 
200 /**
201  * ab8500_btemp_curr_source_enable() - enable/disable batctrl current source
202  * @di:         pointer to the ab8500_btemp structure
203  * @enable:     enable or disable the current source
204  *
205  * Enable or disable the current sources for the BatCtrl AD channel
206  */
207 static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di,
208         bool enable)
209 {
210         int curr;
211         int ret = 0;
212 
213         /*
214          * BATCTRL current sources are included on AB8500 cut2.0
215          * and future versions
216          */
217         if (is_ab8500_1p1_or_earlier(di->parent))
218                 return 0;
219 
220         /* Only do this for batteries with internal NTC */
221         if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && enable) {
222 
223                 if (is_ab8540(di->parent)) {
224                         if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_60UA)
225                                 curr = BAT_CTRL_60U_ENA;
226                         else
227                                 curr = BAT_CTRL_120U_ENA;
228                 } else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
229                         if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_16UA)
230                                 curr = BAT_CTRL_16U_ENA;
231                         else
232                                 curr = BAT_CTRL_18U_ENA;
233                 } else {
234                         if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_7UA)
235                                 curr = BAT_CTRL_7U_ENA;
236                         else
237                                 curr = BAT_CTRL_20U_ENA;
238                 }
239 
240                 dev_dbg(di->dev, "Set BATCTRL %duA\n", di->curr_source);
241 
242                 ret = abx500_mask_and_set_register_interruptible(di->dev,
243                         AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
244                         FORCE_BAT_CTRL_CMP_HIGH, FORCE_BAT_CTRL_CMP_HIGH);
245                 if (ret) {
246                         dev_err(di->dev, "%s failed setting cmp_force\n",
247                                 __func__);
248                         return ret;
249                 }
250 
251                 /*
252                  * We have to wait one 32kHz cycle before enabling
253                  * the current source, since ForceBatCtrlCmpHigh needs
254                  * to be written in a separate cycle
255                  */
256                 udelay(32);
257 
258                 ret = abx500_set_register_interruptible(di->dev,
259                         AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
260                         FORCE_BAT_CTRL_CMP_HIGH | curr);
261                 if (ret) {
262                         dev_err(di->dev, "%s failed enabling current source\n",
263                                 __func__);
264                         goto disable_curr_source;
265                 }
266         } else if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && !enable) {
267                 dev_dbg(di->dev, "Disable BATCTRL curr source\n");
268 
269                 if (is_ab8540(di->parent)) {
270                         /* Write 0 to the curr bits */
271                         ret = abx500_mask_and_set_register_interruptible(
272                                 di->dev,
273                                 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
274                                 BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA,
275                                 ~(BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA));
276                 } else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
277                         /* Write 0 to the curr bits */
278                         ret = abx500_mask_and_set_register_interruptible(
279                                 di->dev,
280                                 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
281                                 BAT_CTRL_16U_ENA | BAT_CTRL_18U_ENA,
282                                 ~(BAT_CTRL_16U_ENA | BAT_CTRL_18U_ENA));
283                 } else {
284                         /* Write 0 to the curr bits */
285                         ret = abx500_mask_and_set_register_interruptible(
286                                 di->dev,
287                                 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
288                                 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
289                                 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
290                 }
291 
292                 if (ret) {
293                         dev_err(di->dev, "%s failed disabling current source\n",
294                                 __func__);
295                         goto disable_curr_source;
296                 }
297 
298                 /* Enable Pull-Up and comparator */
299                 ret = abx500_mask_and_set_register_interruptible(di->dev,
300                         AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
301                         BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
302                         BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
303                 if (ret) {
304                         dev_err(di->dev, "%s failed enabling PU and comp\n",
305                                 __func__);
306                         goto enable_pu_comp;
307                 }
308 
309                 /*
310                  * We have to wait one 32kHz cycle before disabling
311                  * ForceBatCtrlCmpHigh since this needs to be written
312                  * in a separate cycle
313                  */
314                 udelay(32);
315 
316                 /* Disable 'force comparator' */
317                 ret = abx500_mask_and_set_register_interruptible(di->dev,
318                         AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
319                         FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
320                 if (ret) {
321                         dev_err(di->dev, "%s failed disabling force comp\n",
322                                 __func__);
323                         goto disable_force_comp;
324                 }
325         }
326         return ret;
327 
328         /*
329          * We have to try unsetting FORCE_BAT_CTRL_CMP_HIGH one more time
330          * if we got an error above
331          */
332 disable_curr_source:
333         if (is_ab8540(di->parent)) {
334                 /* Write 0 to the curr bits */
335                 ret = abx500_mask_and_set_register_interruptible(di->dev,
336                         AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
337                         BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA,
338                         ~(BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA));
339         } else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
340                 /* Write 0 to the curr bits */
341                 ret = abx500_mask_and_set_register_interruptible(di->dev,
342                         AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
343                         BAT_CTRL_16U_ENA | BAT_CTRL_18U_ENA,
344                         ~(BAT_CTRL_16U_ENA | BAT_CTRL_18U_ENA));
345         } else {
346                 /* Write 0 to the curr bits */
347                 ret = abx500_mask_and_set_register_interruptible(di->dev,
348                         AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
349                         BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
350                         ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
351         }
352 
353         if (ret) {
354                 dev_err(di->dev, "%s failed disabling current source\n",
355                         __func__);
356                 return ret;
357         }
358 enable_pu_comp:
359         /* Enable Pull-Up and comparator */
360         ret = abx500_mask_and_set_register_interruptible(di->dev,
361                 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
362                 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
363                 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
364         if (ret) {
365                 dev_err(di->dev, "%s failed enabling PU and comp\n",
366                         __func__);
367                 return ret;
368         }
369 
370 disable_force_comp:
371         /*
372          * We have to wait one 32kHz cycle before disabling
373          * ForceBatCtrlCmpHigh since this needs to be written
374          * in a separate cycle
375          */
376         udelay(32);
377 
378         /* Disable 'force comparator' */
379         ret = abx500_mask_and_set_register_interruptible(di->dev,
380                 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
381                 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
382         if (ret) {
383                 dev_err(di->dev, "%s failed disabling force comp\n",
384                         __func__);
385                 return ret;
386         }
387 
388         return ret;
389 }
390 
391 /**
392  * ab8500_btemp_get_batctrl_res() - get battery resistance
393  * @di:         pointer to the ab8500_btemp structure
394  *
395  * This function returns the battery pack identification resistance.
396  * Returns value in Ohms.
397  */
398 static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di)
399 {
400         int ret;
401         int batctrl = 0;
402         int res;
403         int inst_curr;
404         int i;
405 
406         /*
407          * BATCTRL current sources are included on AB8500 cut2.0
408          * and future versions
409          */
410         ret = ab8500_btemp_curr_source_enable(di, true);
411         if (ret) {
412                 dev_err(di->dev, "%s curr source enabled failed\n", __func__);
413                 return ret;
414         }
415 
416         if (!di->fg)
417                 di->fg = ab8500_fg_get();
418         if (!di->fg) {
419                 dev_err(di->dev, "No fg found\n");
420                 return -EINVAL;
421         }
422 
423         ret = ab8500_fg_inst_curr_start(di->fg);
424 
425         if (ret) {
426                 dev_err(di->dev, "Failed to start current measurement\n");
427                 return ret;
428         }
429 
430         do {
431                 msleep(20);
432         } while (!ab8500_fg_inst_curr_started(di->fg));
433 
434         i = 0;
435 
436         do {
437                 batctrl += ab8500_btemp_read_batctrl_voltage(di);
438                 i++;
439                 msleep(20);
440         } while (!ab8500_fg_inst_curr_done(di->fg));
441         batctrl /= i;
442 
443         ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
444         if (ret) {
445                 dev_err(di->dev, "Failed to finalize current measurement\n");
446                 return ret;
447         }
448 
449         res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr);
450 
451         ret = ab8500_btemp_curr_source_enable(di, false);
452         if (ret) {
453                 dev_err(di->dev, "%s curr source disable failed\n", __func__);
454                 return ret;
455         }
456 
457         dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
458                 __func__, batctrl, res, inst_curr, i);
459 
460         return res;
461 }
462 
463 /**
464  * ab8500_btemp_res_to_temp() - resistance to temperature
465  * @di:         pointer to the ab8500_btemp structure
466  * @tbl:        pointer to the resiatance to temperature table
467  * @tbl_size:   size of the resistance to temperature table
468  * @res:        resistance to calculate the temperature from
469  *
470  * This function returns the battery temperature in degrees Celcius
471  * based on the NTC resistance.
472  */
473 static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di,
474         const struct abx500_res_to_temp *tbl, int tbl_size, int res)
475 {
476         int i, temp;
477         /*
478          * Calculate the formula for the straight line
479          * Simple interpolation if we are within
480          * the resistance table limits, extrapolate
481          * if resistance is outside the limits.
482          */
483         if (res > tbl[0].resist)
484                 i = 0;
485         else if (res <= tbl[tbl_size - 1].resist)
486                 i = tbl_size - 2;
487         else {
488                 i = 0;
489                 while (!(res <= tbl[i].resist &&
490                         res > tbl[i + 1].resist))
491                         i++;
492         }
493 
494         temp = tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) *
495                 (res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);
496         return temp;
497 }
498 
499 /**
500  * ab8500_btemp_measure_temp() - measure battery temperature
501  * @di:         pointer to the ab8500_btemp structure
502  *
503  * Returns battery temperature (on success) else the previous temperature
504  */
505 static int ab8500_btemp_measure_temp(struct ab8500_btemp *di)
506 {
507         int temp;
508         static int prev;
509         int rbat, rntc, vntc;
510         u8 id;
511 
512         id = di->bm->batt_id;
513 
514         if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL &&
515                         id != BATTERY_UNKNOWN) {
516 
517                 rbat = ab8500_btemp_get_batctrl_res(di);
518                 if (rbat < 0) {
519                         dev_err(di->dev, "%s get batctrl res failed\n",
520                                 __func__);
521                         /*
522                          * Return out-of-range temperature so that
523                          * charging is stopped
524                          */
525                         return BTEMP_THERMAL_LOW_LIMIT;
526                 }
527 
528                 temp = ab8500_btemp_res_to_temp(di,
529                         di->bm->bat_type[id].r_to_t_tbl,
530                         di->bm->bat_type[id].n_temp_tbl_elements, rbat);
531         } else {
532                 vntc = ab8500_gpadc_convert(di->gpadc, BTEMP_BALL);
533                 if (vntc < 0) {
534                         dev_err(di->dev,
535                                 "%s gpadc conversion failed,"
536                                 " using previous value\n", __func__);
537                         return prev;
538                 }
539                 /*
540                  * The PCB NTC is sourced from VTVOUT via a 230kOhm
541                  * resistor.
542                  */
543                 rntc = 230000 * vntc / (VTVOUT_V - vntc);
544 
545                 temp = ab8500_btemp_res_to_temp(di,
546                         di->bm->bat_type[id].r_to_t_tbl,
547                         di->bm->bat_type[id].n_temp_tbl_elements, rntc);
548                 prev = temp;
549         }
550         dev_dbg(di->dev, "Battery temperature is %d\n", temp);
551         return temp;
552 }
553 
554 /**
555  * ab8500_btemp_id() - Identify the connected battery
556  * @di:         pointer to the ab8500_btemp structure
557  *
558  * This function will try to identify the battery by reading the ID
559  * resistor. Some brands use a combined ID resistor with a NTC resistor to
560  * both be able to identify and to read the temperature of it.
561  */
562 static int ab8500_btemp_id(struct ab8500_btemp *di)
563 {
564         int res;
565         u8 i;
566         if (is_ab8540(di->parent))
567                 di->curr_source = BTEMP_BATCTRL_CURR_SRC_60UA;
568         else if (is_ab9540(di->parent) || is_ab8505(di->parent))
569                 di->curr_source = BTEMP_BATCTRL_CURR_SRC_16UA;
570         else
571                 di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
572 
573         di->bm->batt_id = BATTERY_UNKNOWN;
574 
575         res =  ab8500_btemp_get_batctrl_res(di);
576         if (res < 0) {
577                 dev_err(di->dev, "%s get batctrl res failed\n", __func__);
578                 return -ENXIO;
579         }
580 
581         /* BATTERY_UNKNOWN is defined on position 0, skip it! */
582         for (i = BATTERY_UNKNOWN + 1; i < di->bm->n_btypes; i++) {
583                 if ((res <= di->bm->bat_type[i].resis_high) &&
584                         (res >= di->bm->bat_type[i].resis_low)) {
585                         dev_dbg(di->dev, "Battery detected on %s"
586                                 " low %d < res %d < high: %d"
587                                 " index: %d\n",
588                                 di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL ?
589                                 "BATCTRL" : "BATTEMP",
590                                 di->bm->bat_type[i].resis_low, res,
591                                 di->bm->bat_type[i].resis_high, i);
592 
593                         di->bm->batt_id = i;
594                         break;
595                 }
596         }
597 
598         if (di->bm->batt_id == BATTERY_UNKNOWN) {
599                 dev_warn(di->dev, "Battery identified as unknown"
600                         ", resistance %d Ohm\n", res);
601                 return -ENXIO;
602         }
603 
604         /*
605          * We only have to change current source if the
606          * detected type is Type 1.
607          */
608         if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL &&
609             di->bm->batt_id == 1) {
610                 if (is_ab8540(di->parent)) {
611                         dev_dbg(di->dev,
612                                 "Set BATCTRL current source to 60uA\n");
613                         di->curr_source = BTEMP_BATCTRL_CURR_SRC_60UA;
614                 } else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
615                         dev_dbg(di->dev,
616                                 "Set BATCTRL current source to 16uA\n");
617                         di->curr_source = BTEMP_BATCTRL_CURR_SRC_16UA;
618                 } else {
619                         dev_dbg(di->dev, "Set BATCTRL current source to 20uA\n");
620                         di->curr_source = BTEMP_BATCTRL_CURR_SRC_20UA;
621                 }
622         }
623 
624         return di->bm->batt_id;
625 }
626 
627 /**
628  * ab8500_btemp_periodic_work() - Measuring the temperature periodically
629  * @work:       pointer to the work_struct structure
630  *
631  * Work function for measuring the temperature periodically
632  */
633 static void ab8500_btemp_periodic_work(struct work_struct *work)
634 {
635         int interval;
636         int bat_temp;
637         struct ab8500_btemp *di = container_of(work,
638                 struct ab8500_btemp, btemp_periodic_work.work);
639 
640         if (!di->initialized) {
641                 /* Identify the battery */
642                 if (ab8500_btemp_id(di) < 0)
643                         dev_warn(di->dev, "failed to identify the battery\n");
644         }
645 
646         bat_temp = ab8500_btemp_measure_temp(di);
647         /*
648          * Filter battery temperature.
649          * Allow direct updates on temperature only if two samples result in
650          * same temperature. Else only allow 1 degree change from previous
651          * reported value in the direction of the new measurement.
652          */
653         if ((bat_temp == di->prev_bat_temp) || !di->initialized) {
654                 if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) {
655                         di->initialized = true;
656                         di->bat_temp = bat_temp;
657                         power_supply_changed(&di->btemp_psy);
658                 }
659         } else if (bat_temp < di->prev_bat_temp) {
660                 di->bat_temp--;
661                 power_supply_changed(&di->btemp_psy);
662         } else if (bat_temp > di->prev_bat_temp) {
663                 di->bat_temp++;
664                 power_supply_changed(&di->btemp_psy);
665         }
666         di->prev_bat_temp = bat_temp;
667 
668         if (di->events.ac_conn || di->events.usb_conn)
669                 interval = di->bm->temp_interval_chg;
670         else
671                 interval = di->bm->temp_interval_nochg;
672 
673         /* Schedule a new measurement */
674         queue_delayed_work(di->btemp_wq,
675                 &di->btemp_periodic_work,
676                 round_jiffies(interval * HZ));
677 }
678 
679 /**
680  * ab8500_btemp_batctrlindb_handler() - battery removal detected
681  * @irq:       interrupt number
682  * @_di:       void pointer that has to address of ab8500_btemp
683  *
684  * Returns IRQ status(IRQ_HANDLED)
685  */
686 static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
687 {
688         struct ab8500_btemp *di = _di;
689         dev_err(di->dev, "Battery removal detected!\n");
690 
691         di->events.batt_rem = true;
692         power_supply_changed(&di->btemp_psy);
693 
694         return IRQ_HANDLED;
695 }
696 
697 /**
698  * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
699  * @irq:       interrupt number
700  * @_di:       void pointer that has to address of ab8500_btemp
701  *
702  * Returns IRQ status(IRQ_HANDLED)
703  */
704 static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
705 {
706         struct ab8500_btemp *di = _di;
707 
708         if (is_ab8500_3p3_or_earlier(di->parent)) {
709                 dev_dbg(di->dev, "Ignore false btemp low irq"
710                         " for ABB cut 1.0, 1.1, 2.0 and 3.3\n");
711         } else {
712                 dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
713 
714                 di->events.btemp_low = true;
715                 di->events.btemp_high = false;
716                 di->events.btemp_medhigh = false;
717                 di->events.btemp_lowmed = false;
718                 power_supply_changed(&di->btemp_psy);
719         }
720 
721         return IRQ_HANDLED;
722 }
723 
724 /**
725  * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
726  * @irq:       interrupt number
727  * @_di:       void pointer that has to address of ab8500_btemp
728  *
729  * Returns IRQ status(IRQ_HANDLED)
730  */
731 static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di)
732 {
733         struct ab8500_btemp *di = _di;
734 
735         dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
736 
737         di->events.btemp_high = true;
738         di->events.btemp_medhigh = false;
739         di->events.btemp_lowmed = false;
740         di->events.btemp_low = false;
741         power_supply_changed(&di->btemp_psy);
742 
743         return IRQ_HANDLED;
744 }
745 
746 /**
747  * ab8500_btemp_lowmed_handler() - battery temp between low and medium
748  * @irq:       interrupt number
749  * @_di:       void pointer that has to address of ab8500_btemp
750  *
751  * Returns IRQ status(IRQ_HANDLED)
752  */
753 static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
754 {
755         struct ab8500_btemp *di = _di;
756 
757         dev_dbg(di->dev, "Battery temperature is between low and medium\n");
758 
759         di->events.btemp_lowmed = true;
760         di->events.btemp_medhigh = false;
761         di->events.btemp_high = false;
762         di->events.btemp_low = false;
763         power_supply_changed(&di->btemp_psy);
764 
765         return IRQ_HANDLED;
766 }
767 
768 /**
769  * ab8500_btemp_medhigh_handler() - battery temp between medium and high
770  * @irq:       interrupt number
771  * @_di:       void pointer that has to address of ab8500_btemp
772  *
773  * Returns IRQ status(IRQ_HANDLED)
774  */
775 static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di)
776 {
777         struct ab8500_btemp *di = _di;
778 
779         dev_dbg(di->dev, "Battery temperature is between medium and high\n");
780 
781         di->events.btemp_medhigh = true;
782         di->events.btemp_lowmed = false;
783         di->events.btemp_high = false;
784         di->events.btemp_low = false;
785         power_supply_changed(&di->btemp_psy);
786 
787         return IRQ_HANDLED;
788 }
789 
790 /**
791  * ab8500_btemp_periodic() - Periodic temperature measurements
792  * @di:         pointer to the ab8500_btemp structure
793  * @enable:     enable or disable periodic temperature measurements
794  *
795  * Starts of stops periodic temperature measurements. Periodic measurements
796  * should only be done when a charger is connected.
797  */
798 static void ab8500_btemp_periodic(struct ab8500_btemp *di,
799         bool enable)
800 {
801         dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
802                 enable);
803         /*
804          * Make sure a new measurement is done directly by cancelling
805          * any pending work
806          */
807         cancel_delayed_work_sync(&di->btemp_periodic_work);
808 
809         if (enable)
810                 queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
811 }
812 
813 /**
814  * ab8500_btemp_get_temp() - get battery temperature
815  * @di:         pointer to the ab8500_btemp structure
816  *
817  * Returns battery temperature
818  */
819 int ab8500_btemp_get_temp(struct ab8500_btemp *di)
820 {
821         int temp = 0;
822 
823         /*
824          * The BTEMP events are not reliabe on AB8500 cut3.3
825          * and prior versions
826          */
827         if (is_ab8500_3p3_or_earlier(di->parent)) {
828                 temp = di->bat_temp * 10;
829         } else {
830                 if (di->events.btemp_low) {
831                         if (temp > di->btemp_ranges.btemp_low_limit)
832                                 temp = di->btemp_ranges.btemp_low_limit * 10;
833                         else
834                                 temp = di->bat_temp * 10;
835                 } else if (di->events.btemp_high) {
836                         if (temp < di->btemp_ranges.btemp_high_limit)
837                                 temp = di->btemp_ranges.btemp_high_limit * 10;
838                         else
839                                 temp = di->bat_temp * 10;
840                 } else if (di->events.btemp_lowmed) {
841                         if (temp > di->btemp_ranges.btemp_med_limit)
842                                 temp = di->btemp_ranges.btemp_med_limit * 10;
843                         else
844                                 temp = di->bat_temp * 10;
845                 } else if (di->events.btemp_medhigh) {
846                         if (temp < di->btemp_ranges.btemp_med_limit)
847                                 temp = di->btemp_ranges.btemp_med_limit * 10;
848                         else
849                                 temp = di->bat_temp * 10;
850                 } else
851                         temp = di->bat_temp * 10;
852         }
853         return temp;
854 }
855 EXPORT_SYMBOL(ab8500_btemp_get_temp);
856 
857 /**
858  * ab8500_btemp_get_batctrl_temp() - get the temperature
859  * @btemp:      pointer to the btemp structure
860  *
861  * Returns the batctrl temperature in millidegrees
862  */
863 int ab8500_btemp_get_batctrl_temp(struct ab8500_btemp *btemp)
864 {
865         return btemp->bat_temp * 1000;
866 }
867 EXPORT_SYMBOL(ab8500_btemp_get_batctrl_temp);
868 
869 /**
870  * ab8500_btemp_get_property() - get the btemp properties
871  * @psy:        pointer to the power_supply structure
872  * @psp:        pointer to the power_supply_property structure
873  * @val:        pointer to the power_supply_propval union
874  *
875  * This function gets called when an application tries to get the btemp
876  * properties by reading the sysfs files.
877  * online:      presence of the battery
878  * present:     presence of the battery
879  * technology:  battery technology
880  * temp:        battery temperature
881  * Returns error code in case of failure else 0(on success)
882  */
883 static int ab8500_btemp_get_property(struct power_supply *psy,
884         enum power_supply_property psp,
885         union power_supply_propval *val)
886 {
887         struct ab8500_btemp *di;
888 
889         di = to_ab8500_btemp_device_info(psy);
890 
891         switch (psp) {
892         case POWER_SUPPLY_PROP_PRESENT:
893         case POWER_SUPPLY_PROP_ONLINE:
894                 if (di->events.batt_rem)
895                         val->intval = 0;
896                 else
897                         val->intval = 1;
898                 break;
899         case POWER_SUPPLY_PROP_TECHNOLOGY:
900                 val->intval = di->bm->bat_type[di->bm->batt_id].name;
901                 break;
902         case POWER_SUPPLY_PROP_TEMP:
903                 val->intval = ab8500_btemp_get_temp(di);
904                 break;
905         default:
906                 return -EINVAL;
907         }
908         return 0;
909 }
910 
911 static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
912 {
913         struct power_supply *psy;
914         struct power_supply *ext;
915         struct ab8500_btemp *di;
916         union power_supply_propval ret;
917         int i, j;
918         bool psy_found = false;
919 
920         psy = (struct power_supply *)data;
921         ext = dev_get_drvdata(dev);
922         di = to_ab8500_btemp_device_info(psy);
923 
924         /*
925          * For all psy where the name of your driver
926          * appears in any supplied_to
927          */
928         for (i = 0; i < ext->num_supplicants; i++) {
929                 if (!strcmp(ext->supplied_to[i], psy->name))
930                         psy_found = true;
931         }
932 
933         if (!psy_found)
934                 return 0;
935 
936         /* Go through all properties for the psy */
937         for (j = 0; j < ext->num_properties; j++) {
938                 enum power_supply_property prop;
939                 prop = ext->properties[j];
940 
941                 if (ext->get_property(ext, prop, &ret))
942                         continue;
943 
944                 switch (prop) {
945                 case POWER_SUPPLY_PROP_PRESENT:
946                         switch (ext->type) {
947                         case POWER_SUPPLY_TYPE_MAINS:
948                                 /* AC disconnected */
949                                 if (!ret.intval && di->events.ac_conn) {
950                                         di->events.ac_conn = false;
951                                 }
952                                 /* AC connected */
953                                 else if (ret.intval && !di->events.ac_conn) {
954                                         di->events.ac_conn = true;
955                                         if (!di->events.usb_conn)
956                                                 ab8500_btemp_periodic(di, true);
957                                 }
958                                 break;
959                         case POWER_SUPPLY_TYPE_USB:
960                                 /* USB disconnected */
961                                 if (!ret.intval && di->events.usb_conn) {
962                                         di->events.usb_conn = false;
963                                 }
964                                 /* USB connected */
965                                 else if (ret.intval && !di->events.usb_conn) {
966                                         di->events.usb_conn = true;
967                                         if (!di->events.ac_conn)
968                                                 ab8500_btemp_periodic(di, true);
969                                 }
970                                 break;
971                         default:
972                                 break;
973                         }
974                         break;
975                 default:
976                         break;
977                 }
978         }
979         return 0;
980 }
981 
982 /**
983  * ab8500_btemp_external_power_changed() - callback for power supply changes
984  * @psy:       pointer to the structure power_supply
985  *
986  * This function is pointing to the function pointer external_power_changed
987  * of the structure power_supply.
988  * This function gets executed when there is a change in the external power
989  * supply to the btemp.
990  */
991 static void ab8500_btemp_external_power_changed(struct power_supply *psy)
992 {
993         struct ab8500_btemp *di = to_ab8500_btemp_device_info(psy);
994 
995         class_for_each_device(power_supply_class, NULL,
996                 &di->btemp_psy, ab8500_btemp_get_ext_psy_data);
997 }
998 
999 /* ab8500 btemp driver interrupts and their respective isr */
1000 static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
1001         {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
1002         {"BTEMP_LOW", ab8500_btemp_templow_handler},
1003         {"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
1004         {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
1005         {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
1006 };
1007 
1008 #if defined(CONFIG_PM)
1009 static int ab8500_btemp_resume(struct platform_device *pdev)
1010 {
1011         struct ab8500_btemp *di = platform_get_drvdata(pdev);
1012 
1013         ab8500_btemp_periodic(di, true);
1014 
1015         return 0;
1016 }
1017 
1018 static int ab8500_btemp_suspend(struct platform_device *pdev,
1019         pm_message_t state)
1020 {
1021         struct ab8500_btemp *di = platform_get_drvdata(pdev);
1022 
1023         ab8500_btemp_periodic(di, false);
1024 
1025         return 0;
1026 }
1027 #else
1028 #define ab8500_btemp_suspend      NULL
1029 #define ab8500_btemp_resume       NULL
1030 #endif
1031 
1032 static int ab8500_btemp_remove(struct platform_device *pdev)
1033 {
1034         struct ab8500_btemp *di = platform_get_drvdata(pdev);
1035         int i, irq;
1036 
1037         /* Disable interrupts */
1038         for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
1039                 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1040                 free_irq(irq, di);
1041         }
1042 
1043         /* Delete the work queue */
1044         destroy_workqueue(di->btemp_wq);
1045 
1046         flush_scheduled_work();
1047         power_supply_unregister(&di->btemp_psy);
1048 
1049         return 0;
1050 }
1051 
1052 static char *supply_interface[] = {
1053         "ab8500_chargalg",
1054         "ab8500_fg",
1055 };
1056 
1057 static int ab8500_btemp_probe(struct platform_device *pdev)
1058 {
1059         struct device_node *np = pdev->dev.of_node;
1060         struct abx500_bm_data *plat = pdev->dev.platform_data;
1061         struct ab8500_btemp *di;
1062         int irq, i, ret = 0;
1063         u8 val;
1064 
1065         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1066         if (!di) {
1067                 dev_err(&pdev->dev, "%s no mem for ab8500_btemp\n", __func__);
1068                 return -ENOMEM;
1069         }
1070 
1071         if (!plat) {
1072                 dev_err(&pdev->dev, "no battery management data supplied\n");
1073                 return -EINVAL;
1074         }
1075         di->bm = plat;
1076 
1077         if (np) {
1078                 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
1079                 if (ret) {
1080                         dev_err(&pdev->dev, "failed to get battery information\n");
1081                         return ret;
1082                 }
1083         }
1084 
1085         /* get parent data */
1086         di->dev = &pdev->dev;
1087         di->parent = dev_get_drvdata(pdev->dev.parent);
1088         di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
1089 
1090         di->initialized = false;
1091 
1092         /* BTEMP supply */
1093         di->btemp_psy.name = "ab8500_btemp";
1094         di->btemp_psy.type = POWER_SUPPLY_TYPE_BATTERY;
1095         di->btemp_psy.properties = ab8500_btemp_props;
1096         di->btemp_psy.num_properties = ARRAY_SIZE(ab8500_btemp_props);
1097         di->btemp_psy.get_property = ab8500_btemp_get_property;
1098         di->btemp_psy.supplied_to = supply_interface;
1099         di->btemp_psy.num_supplicants = ARRAY_SIZE(supply_interface);
1100         di->btemp_psy.external_power_changed =
1101                 ab8500_btemp_external_power_changed;
1102 
1103 
1104         /* Create a work queue for the btemp */
1105         di->btemp_wq =
1106                 create_singlethread_workqueue("ab8500_btemp_wq");
1107         if (di->btemp_wq == NULL) {
1108                 dev_err(di->dev, "failed to create work queue\n");
1109                 return -ENOMEM;
1110         }
1111 
1112         /* Init work for measuring temperature periodically */
1113         INIT_DEFERRABLE_WORK(&di->btemp_periodic_work,
1114                 ab8500_btemp_periodic_work);
1115 
1116         /* Set BTEMP thermal limits. Low and Med are fixed */
1117         di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
1118         di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
1119 
1120         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1121                 AB8500_BTEMP_HIGH_TH, &val);
1122         if (ret < 0) {
1123                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1124                 goto free_btemp_wq;
1125         }
1126         switch (val) {
1127         case BTEMP_HIGH_TH_57_0:
1128         case BTEMP_HIGH_TH_57_1:
1129                 di->btemp_ranges.btemp_high_limit =
1130                         BTEMP_THERMAL_HIGH_LIMIT_57;
1131                 break;
1132         case BTEMP_HIGH_TH_52:
1133                 di->btemp_ranges.btemp_high_limit =
1134                         BTEMP_THERMAL_HIGH_LIMIT_52;
1135                 break;
1136         case BTEMP_HIGH_TH_62:
1137                 di->btemp_ranges.btemp_high_limit =
1138                         BTEMP_THERMAL_HIGH_LIMIT_62;
1139                 break;
1140         }
1141 
1142         /* Register BTEMP power supply class */
1143         ret = power_supply_register(di->dev, &di->btemp_psy);
1144         if (ret) {
1145                 dev_err(di->dev, "failed to register BTEMP psy\n");
1146                 goto free_btemp_wq;
1147         }
1148 
1149         /* Register interrupts */
1150         for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
1151                 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1152                 ret = request_threaded_irq(irq, NULL, ab8500_btemp_irq[i].isr,
1153                         IRQF_SHARED | IRQF_NO_SUSPEND,
1154                         ab8500_btemp_irq[i].name, di);
1155 
1156                 if (ret) {
1157                         dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
1158                                 , ab8500_btemp_irq[i].name, irq, ret);
1159                         goto free_irq;
1160                 }
1161                 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
1162                         ab8500_btemp_irq[i].name, irq, ret);
1163         }
1164 
1165         platform_set_drvdata(pdev, di);
1166 
1167         /* Kick off periodic temperature measurements */
1168         ab8500_btemp_periodic(di, true);
1169         list_add_tail(&di->node, &ab8500_btemp_list);
1170 
1171         return ret;
1172 
1173 free_irq:
1174         power_supply_unregister(&di->btemp_psy);
1175 
1176         /* We also have to free all successfully registered irqs */
1177         for (i = i - 1; i >= 0; i--) {
1178                 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1179                 free_irq(irq, di);
1180         }
1181 free_btemp_wq:
1182         destroy_workqueue(di->btemp_wq);
1183         return ret;
1184 }
1185 
1186 static const struct of_device_id ab8500_btemp_match[] = {
1187         { .compatible = "stericsson,ab8500-btemp", },
1188         { },
1189 };
1190 
1191 static struct platform_driver ab8500_btemp_driver = {
1192         .probe = ab8500_btemp_probe,
1193         .remove = ab8500_btemp_remove,
1194         .suspend = ab8500_btemp_suspend,
1195         .resume = ab8500_btemp_resume,
1196         .driver = {
1197                 .name = "ab8500-btemp",
1198                 .owner = THIS_MODULE,
1199                 .of_match_table = ab8500_btemp_match,
1200         },
1201 };
1202 
1203 static int __init ab8500_btemp_init(void)
1204 {
1205         return platform_driver_register(&ab8500_btemp_driver);
1206 }
1207 
1208 static void __exit ab8500_btemp_exit(void)
1209 {
1210         platform_driver_unregister(&ab8500_btemp_driver);
1211 }
1212 
1213 device_initcall(ab8500_btemp_init);
1214 module_exit(ab8500_btemp_exit);
1215 
1216 MODULE_LICENSE("GPL v2");
1217 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
1218 MODULE_ALIAS("platform:ab8500-btemp");
1219 MODULE_DESCRIPTION("AB8500 battery temperature driver");
1220 

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