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/mfd/abx500/ab8500.h>
24 #include <linux/mfd/abx500.h>
25 #include <linux/mfd/abx500/ab8500-bm.h>
26 #include <linux/mfd/abx500/ab8500-gpadc.h>
27 #include <linux/jiffies.h>
28
29 #define VTVOUT_V 1800
30
31 #define BTEMP_THERMAL_LOW_LIMIT -10
32 #define BTEMP_THERMAL_MED_LIMIT 0
33 #define BTEMP_THERMAL_HIGH_LIMIT_52 52
34 #define BTEMP_THERMAL_HIGH_LIMIT_57 57
35 #define BTEMP_THERMAL_HIGH_LIMIT_62 62
36
37 #define BTEMP_BATCTRL_CURR_SRC_7UA 7
38 #define BTEMP_BATCTRL_CURR_SRC_20UA 20
39
40 #define to_ab8500_btemp_device_info(x) container_of((x), \
41 struct ab8500_btemp, btemp_psy);
42
43 /**
44 * struct ab8500_btemp_interrupts - ab8500 interrupts
45 * @name: name of the interrupt
46 * @isr function pointer to the isr
47 */
48 struct ab8500_btemp_interrupts {
49 char *name;
50 irqreturn_t (*isr)(int irq, void *data);
51 };
52
53 struct ab8500_btemp_events {
54 bool batt_rem;
55 bool btemp_high;
56 bool btemp_medhigh;
57 bool btemp_lowmed;
58 bool btemp_low;
59 bool ac_conn;
60 bool usb_conn;
61 };
62
63 struct ab8500_btemp_ranges {
64 int btemp_high_limit;
65 int btemp_med_limit;
66 int btemp_low_limit;
67 };
68
69 /**
70 * struct ab8500_btemp - ab8500 BTEMP device information
71 * @dev: Pointer to the structure device
72 * @node: List of AB8500 BTEMPs, hence prepared for reentrance
73 * @curr_source: What current source we use, in uA
74 * @bat_temp: Battery temperature in degree Celcius
75 * @prev_bat_temp Last dispatched battery temperature
76 * @parent: Pointer to the struct ab8500
77 * @gpadc: Pointer to the struct gpadc
78 * @fg: Pointer to the struct fg
79 * @pdata: Pointer to the abx500_btemp platform data
80 * @bat: Pointer to the abx500_bm platform data
81 * @btemp_psy: Structure for BTEMP specific battery properties
82 * @events: Structure for information about events triggered
83 * @btemp_ranges: Battery temperature range structure
84 * @btemp_wq: Work queue for measuring the temperature periodically
85 * @btemp_periodic_work: Work for measuring the temperature periodically
86 */
87 struct ab8500_btemp {
88 struct device *dev;
89 struct list_head node;
90 int curr_source;
91 int bat_temp;
92 int prev_bat_temp;
93 struct ab8500 *parent;
94 struct ab8500_gpadc *gpadc;
95 struct ab8500_fg *fg;
96 struct abx500_btemp_platform_data *pdata;
97 struct abx500_bm_data *bat;
98 struct power_supply btemp_psy;
99 struct ab8500_btemp_events events;
100 struct ab8500_btemp_ranges btemp_ranges;
101 struct workqueue_struct *btemp_wq;
102 struct delayed_work btemp_periodic_work;
103 };
104
105 /* BTEMP power supply properties */
106 static enum power_supply_property ab8500_btemp_props[] = {
107 POWER_SUPPLY_PROP_PRESENT,
108 POWER_SUPPLY_PROP_ONLINE,
109 POWER_SUPPLY_PROP_TECHNOLOGY,
110 POWER_SUPPLY_PROP_TEMP,
111 };
112
113 static LIST_HEAD(ab8500_btemp_list);
114
115 /**
116 * ab8500_btemp_get() - returns a reference to the primary AB8500 BTEMP
117 * (i.e. the first BTEMP in the instance list)
118 */
ab8500_btemp_get(void)119 struct ab8500_btemp *ab8500_btemp_get(void)
120 {
121 struct ab8500_btemp *btemp;
122 btemp = list_first_entry(&ab8500_btemp_list, struct ab8500_btemp, node);
123
124 return btemp;
125 }
126
127 /**
128 * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
129 * @di: pointer to the ab8500_btemp structure
130 * @v_batctrl: measured batctrl voltage
131 * @inst_curr: measured instant current
132 *
133 * This function returns the battery resistance that is
134 * derived from the BATCTRL voltage.
135 * Returns value in Ohms.
136 */
ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp * di,int v_batctrl,int inst_curr)137 static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
138 int v_batctrl, int inst_curr)
139 {
140 int rbs;
141
142 if (is_ab8500_1p1_or_earlier(di->parent)) {
143 /*
144 * For ABB cut1.0 and 1.1 BAT_CTRL is internally
145 * connected to 1.8V through a 450k resistor
146 */
147 return (450000 * (v_batctrl)) / (1800 - v_batctrl);
148 }
149
150 if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL) {
151 /*
152 * If the battery has internal NTC, we use the current
153 * source to calculate the resistance, 7uA or 20uA
154 */
155 rbs = (v_batctrl * 1000
156 - di->bat->gnd_lift_resistance * inst_curr)
157 / di->curr_source;
158 } else {
159 /*
160 * BAT_CTRL is internally
161 * connected to 1.8V through a 80k resistor
162 */
163 rbs = (80000 * (v_batctrl)) / (1800 - v_batctrl);
164 }
165
166 return rbs;
167 }
168
169 /**
170 * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
171 * @di: pointer to the ab8500_btemp structure
172 *
173 * This function returns the voltage on BATCTRL. Returns value in mV.
174 */
ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp * di)175 static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
176 {
177 int vbtemp;
178 static int prev;
179
180 vbtemp = ab8500_gpadc_convert(di->gpadc, BAT_CTRL);
181 if (vbtemp < 0) {
182 dev_err(di->dev,
183 "%s gpadc conversion failed, using previous value",
184 __func__);
185 return prev;
186 }
187 prev = vbtemp;
188 return vbtemp;
189 }
190
191 /**
192 * ab8500_btemp_curr_source_enable() - enable/disable batctrl current source
193 * @di: pointer to the ab8500_btemp structure
194 * @enable: enable or disable the current source
195 *
196 * Enable or disable the current sources for the BatCtrl AD channel
197 */
ab8500_btemp_curr_source_enable(struct ab8500_btemp * di,bool enable)198 static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di,
199 bool enable)
200 {
201 int curr;
202 int ret = 0;
203
204 /*
205 * BATCTRL current sources are included on AB8500 cut2.0
206 * and future versions
207 */
208 if (is_ab8500_1p1_or_earlier(di->parent))
209 return 0;
210
211 /* Only do this for batteries with internal NTC */
212 if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL && enable) {
213 if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_7UA)
214 curr = BAT_CTRL_7U_ENA;
215 else
216 curr = BAT_CTRL_20U_ENA;
217
218 dev_dbg(di->dev, "Set BATCTRL %duA\n", di->curr_source);
219
220 ret = abx500_mask_and_set_register_interruptible(di->dev,
221 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
222 FORCE_BAT_CTRL_CMP_HIGH, FORCE_BAT_CTRL_CMP_HIGH);
223 if (ret) {
224 dev_err(di->dev, "%s failed setting cmp_force\n",
225 __func__);
226 return ret;
227 }
228
229 /*
230 * We have to wait one 32kHz cycle before enabling
231 * the current source, since ForceBatCtrlCmpHigh needs
232 * to be written in a separate cycle
233 */
234 udelay(32);
235
236 ret = abx500_set_register_interruptible(di->dev,
237 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
238 FORCE_BAT_CTRL_CMP_HIGH | curr);
239 if (ret) {
240 dev_err(di->dev, "%s failed enabling current source\n",
241 __func__);
242 goto disable_curr_source;
243 }
244 } else if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL && !enable) {
245 dev_dbg(di->dev, "Disable BATCTRL curr source\n");
246
247 /* Write 0 to the curr bits */
248 ret = abx500_mask_and_set_register_interruptible(di->dev,
249 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
250 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
251 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
252 if (ret) {
253 dev_err(di->dev, "%s failed disabling current source\n",
254 __func__);
255 goto disable_curr_source;
256 }
257
258 /* Enable Pull-Up and comparator */
259 ret = abx500_mask_and_set_register_interruptible(di->dev,
260 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
261 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
262 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
263 if (ret) {
264 dev_err(di->dev, "%s failed enabling PU and comp\n",
265 __func__);
266 goto enable_pu_comp;
267 }
268
269 /*
270 * We have to wait one 32kHz cycle before disabling
271 * ForceBatCtrlCmpHigh since this needs to be written
272 * in a separate cycle
273 */
274 udelay(32);
275
276 /* Disable 'force comparator' */
277 ret = abx500_mask_and_set_register_interruptible(di->dev,
278 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
279 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
280 if (ret) {
281 dev_err(di->dev, "%s failed disabling force comp\n",
282 __func__);
283 goto disable_force_comp;
284 }
285 }
286 return ret;
287
288 /*
289 * We have to try unsetting FORCE_BAT_CTRL_CMP_HIGH one more time
290 * if we got an error above
291 */
292 disable_curr_source:
293 /* Write 0 to the curr bits */
294 ret = abx500_mask_and_set_register_interruptible(di->dev,
295 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
296 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
297 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
298 if (ret) {
299 dev_err(di->dev, "%s failed disabling current source\n",
300 __func__);
301 return ret;
302 }
303 enable_pu_comp:
304 /* Enable Pull-Up and comparator */
305 ret = abx500_mask_and_set_register_interruptible(di->dev,
306 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
307 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
308 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
309 if (ret) {
310 dev_err(di->dev, "%s failed enabling PU and comp\n",
311 __func__);
312 return ret;
313 }
314
315 disable_force_comp:
316 /*
317 * We have to wait one 32kHz cycle before disabling
318 * ForceBatCtrlCmpHigh since this needs to be written
319 * in a separate cycle
320 */
321 udelay(32);
322
323 /* Disable 'force comparator' */
324 ret = abx500_mask_and_set_register_interruptible(di->dev,
325 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
326 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
327 if (ret) {
328 dev_err(di->dev, "%s failed disabling force comp\n",
329 __func__);
330 return ret;
331 }
332
333 return ret;
334 }
335
336 /**
337 * ab8500_btemp_get_batctrl_res() - get battery resistance
338 * @di: pointer to the ab8500_btemp structure
339 *
340 * This function returns the battery pack identification resistance.
341 * Returns value in Ohms.
342 */
ab8500_btemp_get_batctrl_res(struct ab8500_btemp * di)343 static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di)
344 {
345 int ret;
346 int batctrl = 0;
347 int res;
348 int inst_curr;
349 int i;
350
351 /*
352 * BATCTRL current sources are included on AB8500 cut2.0
353 * and future versions
354 */
355 ret = ab8500_btemp_curr_source_enable(di, true);
356 if (ret) {
357 dev_err(di->dev, "%s curr source enabled failed\n", __func__);
358 return ret;
359 }
360
361 if (!di->fg)
362 di->fg = ab8500_fg_get();
363 if (!di->fg) {
364 dev_err(di->dev, "No fg found\n");
365 return -EINVAL;
366 }
367
368 ret = ab8500_fg_inst_curr_start(di->fg);
369
370 if (ret) {
371 dev_err(di->dev, "Failed to start current measurement\n");
372 return ret;
373 }
374
375 /*
376 * Since there is no interrupt when current measurement is done,
377 * loop for over 250ms (250ms is one sample conversion time
378 * with 32.768 Khz RTC clock). Note that a stop time must be set
379 * since the ab8500_btemp_read_batctrl_voltage call can block and
380 * take an unknown amount of time to complete.
381 */
382 i = 0;
383
384 do {
385 batctrl += ab8500_btemp_read_batctrl_voltage(di);
386 i++;
387 msleep(20);
388 } while (!ab8500_fg_inst_curr_done(di->fg));
389 batctrl /= i;
390
391 ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
392 if (ret) {
393 dev_err(di->dev, "Failed to finalize current measurement\n");
394 return ret;
395 }
396
397 res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr);
398
399 ret = ab8500_btemp_curr_source_enable(di, false);
400 if (ret) {
401 dev_err(di->dev, "%s curr source disable failed\n", __func__);
402 return ret;
403 }
404
405 dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
406 __func__, batctrl, res, inst_curr, i);
407
408 return res;
409 }
410
411 /**
412 * ab8500_btemp_res_to_temp() - resistance to temperature
413 * @di: pointer to the ab8500_btemp structure
414 * @tbl: pointer to the resiatance to temperature table
415 * @tbl_size: size of the resistance to temperature table
416 * @res: resistance to calculate the temperature from
417 *
418 * This function returns the battery temperature in degrees Celcius
419 * based on the NTC resistance.
420 */
ab8500_btemp_res_to_temp(struct ab8500_btemp * di,const struct abx500_res_to_temp * tbl,int tbl_size,int res)421 static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di,
422 const struct abx500_res_to_temp *tbl, int tbl_size, int res)
423 {
424 int i, temp;
425 /*
426 * Calculate the formula for the straight line
427 * Simple interpolation if we are within
428 * the resistance table limits, extrapolate
429 * if resistance is outside the limits.
430 */
431 if (res > tbl[0].resist)
432 i = 0;
433 else if (res <= tbl[tbl_size - 1].resist)
434 i = tbl_size - 2;
435 else {
436 i = 0;
437 while (!(res <= tbl[i].resist &&
438 res > tbl[i + 1].resist))
439 i++;
440 }
441
442 temp = tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) *
443 (res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);
444 return temp;
445 }
446
447 /**
448 * ab8500_btemp_measure_temp() - measure battery temperature
449 * @di: pointer to the ab8500_btemp structure
450 *
451 * Returns battery temperature (on success) else the previous temperature
452 */
ab8500_btemp_measure_temp(struct ab8500_btemp * di)453 static int ab8500_btemp_measure_temp(struct ab8500_btemp *di)
454 {
455 int temp;
456 static int prev;
457 int rbat, rntc, vntc;
458 u8 id;
459
460 id = di->bat->batt_id;
461
462 if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL &&
463 id != BATTERY_UNKNOWN) {
464
465 rbat = ab8500_btemp_get_batctrl_res(di);
466 if (rbat < 0) {
467 dev_err(di->dev, "%s get batctrl res failed\n",
468 __func__);
469 /*
470 * Return out-of-range temperature so that
471 * charging is stopped
472 */
473 return BTEMP_THERMAL_LOW_LIMIT;
474 }
475
476 temp = ab8500_btemp_res_to_temp(di,
477 di->bat->bat_type[id].r_to_t_tbl,
478 di->bat->bat_type[id].n_temp_tbl_elements, rbat);
479 } else {
480 vntc = ab8500_gpadc_convert(di->gpadc, BTEMP_BALL);
481 if (vntc < 0) {
482 dev_err(di->dev,
483 "%s gpadc conversion failed,"
484 " using previous value\n", __func__);
485 return prev;
486 }
487 /*
488 * The PCB NTC is sourced from VTVOUT via a 230kOhm
489 * resistor.
490 */
491 rntc = 230000 * vntc / (VTVOUT_V - vntc);
492
493 temp = ab8500_btemp_res_to_temp(di,
494 di->bat->bat_type[id].r_to_t_tbl,
495 di->bat->bat_type[id].n_temp_tbl_elements, rntc);
496 prev = temp;
497 }
498 dev_dbg(di->dev, "Battery temperature is %d\n", temp);
499 return temp;
500 }
501
502 /**
503 * ab8500_btemp_id() - Identify the connected battery
504 * @di: pointer to the ab8500_btemp structure
505 *
506 * This function will try to identify the battery by reading the ID
507 * resistor. Some brands use a combined ID resistor with a NTC resistor to
508 * both be able to identify and to read the temperature of it.
509 */
ab8500_btemp_id(struct ab8500_btemp * di)510 static int ab8500_btemp_id(struct ab8500_btemp *di)
511 {
512 int res;
513 u8 i;
514
515 di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
516 di->bat->batt_id = BATTERY_UNKNOWN;
517
518 res = ab8500_btemp_get_batctrl_res(di);
519 if (res < 0) {
520 dev_err(di->dev, "%s get batctrl res failed\n", __func__);
521 return -ENXIO;
522 }
523
524 /* BATTERY_UNKNOWN is defined on position 0, skip it! */
525 for (i = BATTERY_UNKNOWN + 1; i < di->bat->n_btypes; i++) {
526 if ((res <= di->bat->bat_type[i].resis_high) &&
527 (res >= di->bat->bat_type[i].resis_low)) {
528 dev_dbg(di->dev, "Battery detected on %s"
529 " low %d < res %d < high: %d"
530 " index: %d\n",
531 di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL ?
532 "BATCTRL" : "BATTEMP",
533 di->bat->bat_type[i].resis_low, res,
534 di->bat->bat_type[i].resis_high, i);
535
536 di->bat->batt_id = i;
537 break;
538 }
539 }
540
541 if (di->bat->batt_id == BATTERY_UNKNOWN) {
542 dev_warn(di->dev, "Battery identified as unknown"
543 ", resistance %d Ohm\n", res);
544 return -ENXIO;
545 }
546
547 /*
548 * We only have to change current source if the
549 * detected type is Type 1, else we use the 7uA source
550 */
551 if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL &&
552 di->bat->batt_id == 1) {
553 dev_dbg(di->dev, "Set BATCTRL current source to 20uA\n");
554 di->curr_source = BTEMP_BATCTRL_CURR_SRC_20UA;
555 }
556
557 return di->bat->batt_id;
558 }
559
560 /**
561 * ab8500_btemp_periodic_work() - Measuring the temperature periodically
562 * @work: pointer to the work_struct structure
563 *
564 * Work function for measuring the temperature periodically
565 */
ab8500_btemp_periodic_work(struct work_struct * work)566 static void ab8500_btemp_periodic_work(struct work_struct *work)
567 {
568 int interval;
569 struct ab8500_btemp *di = container_of(work,
570 struct ab8500_btemp, btemp_periodic_work.work);
571
572 di->bat_temp = ab8500_btemp_measure_temp(di);
573
574 if (di->bat_temp != di->prev_bat_temp) {
575 di->prev_bat_temp = di->bat_temp;
576 power_supply_changed(&di->btemp_psy);
577 }
578
579 if (di->events.ac_conn || di->events.usb_conn)
580 interval = di->bat->temp_interval_chg;
581 else
582 interval = di->bat->temp_interval_nochg;
583
584 /* Schedule a new measurement */
585 queue_delayed_work(di->btemp_wq,
586 &di->btemp_periodic_work,
587 round_jiffies(interval * HZ));
588 }
589
590 /**
591 * ab8500_btemp_batctrlindb_handler() - battery removal detected
592 * @irq: interrupt number
593 * @_di: void pointer that has to address of ab8500_btemp
594 *
595 * Returns IRQ status(IRQ_HANDLED)
596 */
ab8500_btemp_batctrlindb_handler(int irq,void * _di)597 static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
598 {
599 struct ab8500_btemp *di = _di;
600 dev_err(di->dev, "Battery removal detected!\n");
601
602 di->events.batt_rem = true;
603 power_supply_changed(&di->btemp_psy);
604
605 return IRQ_HANDLED;
606 }
607
608 /**
609 * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
610 * @irq: interrupt number
611 * @_di: void pointer that has to address of ab8500_btemp
612 *
613 * Returns IRQ status(IRQ_HANDLED)
614 */
ab8500_btemp_templow_handler(int irq,void * _di)615 static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
616 {
617 struct ab8500_btemp *di = _di;
618
619 if (is_ab8500_2p0_or_earlier(di->parent)) {
620 dev_dbg(di->dev, "Ignore false btemp low irq"
621 " for ABB cut 1.0, 1.1 and 2.0\n");
622 } else {
623 dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
624
625 di->events.btemp_low = true;
626 di->events.btemp_high = false;
627 di->events.btemp_medhigh = false;
628 di->events.btemp_lowmed = false;
629 power_supply_changed(&di->btemp_psy);
630 }
631
632 return IRQ_HANDLED;
633 }
634
635 /**
636 * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
637 * @irq: interrupt number
638 * @_di: void pointer that has to address of ab8500_btemp
639 *
640 * Returns IRQ status(IRQ_HANDLED)
641 */
ab8500_btemp_temphigh_handler(int irq,void * _di)642 static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di)
643 {
644 struct ab8500_btemp *di = _di;
645
646 dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
647
648 di->events.btemp_high = true;
649 di->events.btemp_medhigh = false;
650 di->events.btemp_lowmed = false;
651 di->events.btemp_low = false;
652 power_supply_changed(&di->btemp_psy);
653
654 return IRQ_HANDLED;
655 }
656
657 /**
658 * ab8500_btemp_lowmed_handler() - battery temp between low and medium
659 * @irq: interrupt number
660 * @_di: void pointer that has to address of ab8500_btemp
661 *
662 * Returns IRQ status(IRQ_HANDLED)
663 */
ab8500_btemp_lowmed_handler(int irq,void * _di)664 static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
665 {
666 struct ab8500_btemp *di = _di;
667
668 dev_dbg(di->dev, "Battery temperature is between low and medium\n");
669
670 di->events.btemp_lowmed = true;
671 di->events.btemp_medhigh = false;
672 di->events.btemp_high = false;
673 di->events.btemp_low = false;
674 power_supply_changed(&di->btemp_psy);
675
676 return IRQ_HANDLED;
677 }
678
679 /**
680 * ab8500_btemp_medhigh_handler() - battery temp between medium and high
681 * @irq: interrupt number
682 * @_di: void pointer that has to address of ab8500_btemp
683 *
684 * Returns IRQ status(IRQ_HANDLED)
685 */
ab8500_btemp_medhigh_handler(int irq,void * _di)686 static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di)
687 {
688 struct ab8500_btemp *di = _di;
689
690 dev_dbg(di->dev, "Battery temperature is between medium and high\n");
691
692 di->events.btemp_medhigh = true;
693 di->events.btemp_lowmed = false;
694 di->events.btemp_high = false;
695 di->events.btemp_low = false;
696 power_supply_changed(&di->btemp_psy);
697
698 return IRQ_HANDLED;
699 }
700
701 /**
702 * ab8500_btemp_periodic() - Periodic temperature measurements
703 * @di: pointer to the ab8500_btemp structure
704 * @enable: enable or disable periodic temperature measurements
705 *
706 * Starts of stops periodic temperature measurements. Periodic measurements
707 * should only be done when a charger is connected.
708 */
ab8500_btemp_periodic(struct ab8500_btemp * di,bool enable)709 static void ab8500_btemp_periodic(struct ab8500_btemp *di,
710 bool enable)
711 {
712 dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
713 enable);
714 /*
715 * Make sure a new measurement is done directly by cancelling
716 * any pending work
717 */
718 cancel_delayed_work_sync(&di->btemp_periodic_work);
719
720 if (enable)
721 queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
722 }
723
724 /**
725 * ab8500_btemp_get_temp() - get battery temperature
726 * @di: pointer to the ab8500_btemp structure
727 *
728 * Returns battery temperature
729 */
ab8500_btemp_get_temp(struct ab8500_btemp * di)730 static int ab8500_btemp_get_temp(struct ab8500_btemp *di)
731 {
732 int temp = 0;
733
734 /*
735 * The BTEMP events are not reliabe on AB8500 cut2.0
736 * and prior versions
737 */
738 if (is_ab8500_2p0_or_earlier(di->parent)) {
739 temp = di->bat_temp * 10;
740 } else {
741 if (di->events.btemp_low) {
742 if (temp > di->btemp_ranges.btemp_low_limit)
743 temp = di->btemp_ranges.btemp_low_limit;
744 else
745 temp = di->bat_temp * 10;
746 } else if (di->events.btemp_high) {
747 if (temp < di->btemp_ranges.btemp_high_limit)
748 temp = di->btemp_ranges.btemp_high_limit;
749 else
750 temp = di->bat_temp * 10;
751 } else if (di->events.btemp_lowmed) {
752 if (temp > di->btemp_ranges.btemp_med_limit)
753 temp = di->btemp_ranges.btemp_med_limit;
754 else
755 temp = di->bat_temp * 10;
756 } else if (di->events.btemp_medhigh) {
757 if (temp < di->btemp_ranges.btemp_med_limit)
758 temp = di->btemp_ranges.btemp_med_limit;
759 else
760 temp = di->bat_temp * 10;
761 } else
762 temp = di->bat_temp * 10;
763 }
764 return temp;
765 }
766
767 /**
768 * ab8500_btemp_get_batctrl_temp() - get the temperature
769 * @btemp: pointer to the btemp structure
770 *
771 * Returns the batctrl temperature in millidegrees
772 */
ab8500_btemp_get_batctrl_temp(struct ab8500_btemp * btemp)773 int ab8500_btemp_get_batctrl_temp(struct ab8500_btemp *btemp)
774 {
775 return btemp->bat_temp * 1000;
776 }
777
778 /**
779 * ab8500_btemp_get_property() - get the btemp properties
780 * @psy: pointer to the power_supply structure
781 * @psp: pointer to the power_supply_property structure
782 * @val: pointer to the power_supply_propval union
783 *
784 * This function gets called when an application tries to get the btemp
785 * properties by reading the sysfs files.
786 * online: presence of the battery
787 * present: presence of the battery
788 * technology: battery technology
789 * temp: battery temperature
790 * Returns error code in case of failure else 0(on success)
791 */
ab8500_btemp_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)792 static int ab8500_btemp_get_property(struct power_supply *psy,
793 enum power_supply_property psp,
794 union power_supply_propval *val)
795 {
796 struct ab8500_btemp *di;
797
798 di = to_ab8500_btemp_device_info(psy);
799
800 switch (psp) {
801 case POWER_SUPPLY_PROP_PRESENT:
802 case POWER_SUPPLY_PROP_ONLINE:
803 if (di->events.batt_rem)
804 val->intval = 0;
805 else
806 val->intval = 1;
807 break;
808 case POWER_SUPPLY_PROP_TECHNOLOGY:
809 val->intval = di->bat->bat_type[di->bat->batt_id].name;
810 break;
811 case POWER_SUPPLY_PROP_TEMP:
812 val->intval = ab8500_btemp_get_temp(di);
813 break;
814 default:
815 return -EINVAL;
816 }
817 return 0;
818 }
819
ab8500_btemp_get_ext_psy_data(struct device * dev,void * data)820 static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
821 {
822 struct power_supply *psy;
823 struct power_supply *ext;
824 struct ab8500_btemp *di;
825 union power_supply_propval ret;
826 int i, j;
827 bool psy_found = false;
828
829 psy = (struct power_supply *)data;
830 ext = dev_get_drvdata(dev);
831 di = to_ab8500_btemp_device_info(psy);
832
833 /*
834 * For all psy where the name of your driver
835 * appears in any supplied_to
836 */
837 for (i = 0; i < ext->num_supplicants; i++) {
838 if (!strcmp(ext->supplied_to[i], psy->name))
839 psy_found = true;
840 }
841
842 if (!psy_found)
843 return 0;
844
845 /* Go through all properties for the psy */
846 for (j = 0; j < ext->num_properties; j++) {
847 enum power_supply_property prop;
848 prop = ext->properties[j];
849
850 if (ext->get_property(ext, prop, &ret))
851 continue;
852
853 switch (prop) {
854 case POWER_SUPPLY_PROP_PRESENT:
855 switch (ext->type) {
856 case POWER_SUPPLY_TYPE_MAINS:
857 /* AC disconnected */
858 if (!ret.intval && di->events.ac_conn) {
859 di->events.ac_conn = false;
860 }
861 /* AC connected */
862 else if (ret.intval && !di->events.ac_conn) {
863 di->events.ac_conn = true;
864 if (!di->events.usb_conn)
865 ab8500_btemp_periodic(di, true);
866 }
867 break;
868 case POWER_SUPPLY_TYPE_USB:
869 /* USB disconnected */
870 if (!ret.intval && di->events.usb_conn) {
871 di->events.usb_conn = false;
872 }
873 /* USB connected */
874 else if (ret.intval && !di->events.usb_conn) {
875 di->events.usb_conn = true;
876 if (!di->events.ac_conn)
877 ab8500_btemp_periodic(di, true);
878 }
879 break;
880 default:
881 break;
882 }
883 break;
884 default:
885 break;
886 }
887 }
888 return 0;
889 }
890
891 /**
892 * ab8500_btemp_external_power_changed() - callback for power supply changes
893 * @psy: pointer to the structure power_supply
894 *
895 * This function is pointing to the function pointer external_power_changed
896 * of the structure power_supply.
897 * This function gets executed when there is a change in the external power
898 * supply to the btemp.
899 */
ab8500_btemp_external_power_changed(struct power_supply * psy)900 static void ab8500_btemp_external_power_changed(struct power_supply *psy)
901 {
902 struct ab8500_btemp *di = to_ab8500_btemp_device_info(psy);
903
904 class_for_each_device(power_supply_class, NULL,
905 &di->btemp_psy, ab8500_btemp_get_ext_psy_data);
906 }
907
908 /* ab8500 btemp driver interrupts and their respective isr */
909 static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
910 {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
911 {"BTEMP_LOW", ab8500_btemp_templow_handler},
912 {"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
913 {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
914 {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
915 };
916
917 #if defined(CONFIG_PM)
ab8500_btemp_resume(struct platform_device * pdev)918 static int ab8500_btemp_resume(struct platform_device *pdev)
919 {
920 struct ab8500_btemp *di = platform_get_drvdata(pdev);
921
922 ab8500_btemp_periodic(di, true);
923
924 return 0;
925 }
926
ab8500_btemp_suspend(struct platform_device * pdev,pm_message_t state)927 static int ab8500_btemp_suspend(struct platform_device *pdev,
928 pm_message_t state)
929 {
930 struct ab8500_btemp *di = platform_get_drvdata(pdev);
931
932 ab8500_btemp_periodic(di, false);
933
934 return 0;
935 }
936 #else
937 #define ab8500_btemp_suspend NULL
938 #define ab8500_btemp_resume NULL
939 #endif
940
ab8500_btemp_remove(struct platform_device * pdev)941 static int __devexit ab8500_btemp_remove(struct platform_device *pdev)
942 {
943 struct ab8500_btemp *di = platform_get_drvdata(pdev);
944 int i, irq;
945
946 /* Disable interrupts */
947 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
948 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
949 free_irq(irq, di);
950 }
951
952 /* Delete the work queue */
953 destroy_workqueue(di->btemp_wq);
954
955 flush_scheduled_work();
956 power_supply_unregister(&di->btemp_psy);
957 platform_set_drvdata(pdev, NULL);
958 kfree(di);
959
960 return 0;
961 }
962
ab8500_btemp_probe(struct platform_device * pdev)963 static int __devinit ab8500_btemp_probe(struct platform_device *pdev)
964 {
965 int irq, i, ret = 0;
966 u8 val;
967 struct abx500_bm_plat_data *plat_data;
968
969 struct ab8500_btemp *di =
970 kzalloc(sizeof(struct ab8500_btemp), GFP_KERNEL);
971 if (!di)
972 return -ENOMEM;
973
974 /* get parent data */
975 di->dev = &pdev->dev;
976 di->parent = dev_get_drvdata(pdev->dev.parent);
977 di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
978
979 /* get btemp specific platform data */
980 plat_data = pdev->dev.platform_data;
981 di->pdata = plat_data->btemp;
982 if (!di->pdata) {
983 dev_err(di->dev, "no btemp platform data supplied\n");
984 ret = -EINVAL;
985 goto free_device_info;
986 }
987
988 /* get battery specific platform data */
989 di->bat = plat_data->battery;
990 if (!di->bat) {
991 dev_err(di->dev, "no battery platform data supplied\n");
992 ret = -EINVAL;
993 goto free_device_info;
994 }
995
996 /* BTEMP supply */
997 di->btemp_psy.name = "ab8500_btemp";
998 di->btemp_psy.type = POWER_SUPPLY_TYPE_BATTERY;
999 di->btemp_psy.properties = ab8500_btemp_props;
1000 di->btemp_psy.num_properties = ARRAY_SIZE(ab8500_btemp_props);
1001 di->btemp_psy.get_property = ab8500_btemp_get_property;
1002 di->btemp_psy.supplied_to = di->pdata->supplied_to;
1003 di->btemp_psy.num_supplicants = di->pdata->num_supplicants;
1004 di->btemp_psy.external_power_changed =
1005 ab8500_btemp_external_power_changed;
1006
1007
1008 /* Create a work queue for the btemp */
1009 di->btemp_wq =
1010 create_singlethread_workqueue("ab8500_btemp_wq");
1011 if (di->btemp_wq == NULL) {
1012 dev_err(di->dev, "failed to create work queue\n");
1013 goto free_device_info;
1014 }
1015
1016 /* Init work for measuring temperature periodically */
1017 INIT_DELAYED_WORK_DEFERRABLE(&di->btemp_periodic_work,
1018 ab8500_btemp_periodic_work);
1019
1020 /* Identify the battery */
1021 if (ab8500_btemp_id(di) < 0)
1022 dev_warn(di->dev, "failed to identify the battery\n");
1023
1024 /* Set BTEMP thermal limits. Low and Med are fixed */
1025 di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
1026 di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
1027
1028 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1029 AB8500_BTEMP_HIGH_TH, &val);
1030 if (ret < 0) {
1031 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1032 goto free_btemp_wq;
1033 }
1034 switch (val) {
1035 case BTEMP_HIGH_TH_57_0:
1036 case BTEMP_HIGH_TH_57_1:
1037 di->btemp_ranges.btemp_high_limit =
1038 BTEMP_THERMAL_HIGH_LIMIT_57;
1039 break;
1040 case BTEMP_HIGH_TH_52:
1041 di->btemp_ranges.btemp_high_limit =
1042 BTEMP_THERMAL_HIGH_LIMIT_52;
1043 break;
1044 case BTEMP_HIGH_TH_62:
1045 di->btemp_ranges.btemp_high_limit =
1046 BTEMP_THERMAL_HIGH_LIMIT_62;
1047 break;
1048 }
1049
1050 /* Register BTEMP power supply class */
1051 ret = power_supply_register(di->dev, &di->btemp_psy);
1052 if (ret) {
1053 dev_err(di->dev, "failed to register BTEMP psy\n");
1054 goto free_btemp_wq;
1055 }
1056
1057 /* Register interrupts */
1058 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
1059 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1060 ret = request_threaded_irq(irq, NULL, ab8500_btemp_irq[i].isr,
1061 IRQF_SHARED | IRQF_NO_SUSPEND,
1062 ab8500_btemp_irq[i].name, di);
1063
1064 if (ret) {
1065 dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
1066 , ab8500_btemp_irq[i].name, irq, ret);
1067 goto free_irq;
1068 }
1069 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
1070 ab8500_btemp_irq[i].name, irq, ret);
1071 }
1072
1073 platform_set_drvdata(pdev, di);
1074
1075 /* Kick off periodic temperature measurements */
1076 ab8500_btemp_periodic(di, true);
1077 list_add_tail(&di->node, &ab8500_btemp_list);
1078
1079 return ret;
1080
1081 free_irq:
1082 power_supply_unregister(&di->btemp_psy);
1083
1084 /* We also have to free all successfully registered irqs */
1085 for (i = i - 1; i >= 0; i--) {
1086 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1087 free_irq(irq, di);
1088 }
1089 free_btemp_wq:
1090 destroy_workqueue(di->btemp_wq);
1091 free_device_info:
1092 kfree(di);
1093
1094 return ret;
1095 }
1096
1097 static struct platform_driver ab8500_btemp_driver = {
1098 .probe = ab8500_btemp_probe,
1099 .remove = __devexit_p(ab8500_btemp_remove),
1100 .suspend = ab8500_btemp_suspend,
1101 .resume = ab8500_btemp_resume,
1102 .driver = {
1103 .name = "ab8500-btemp",
1104 .owner = THIS_MODULE,
1105 },
1106 };
1107
ab8500_btemp_init(void)1108 static int __init ab8500_btemp_init(void)
1109 {
1110 return platform_driver_register(&ab8500_btemp_driver);
1111 }
1112
ab8500_btemp_exit(void)1113 static void __exit ab8500_btemp_exit(void)
1114 {
1115 platform_driver_unregister(&ab8500_btemp_driver);
1116 }
1117
1118 device_initcall(ab8500_btemp_init);
1119 module_exit(ab8500_btemp_exit);
1120
1121 MODULE_LICENSE("GPL v2");
1122 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
1123 MODULE_ALIAS("platform:ab8500-btemp");
1124 MODULE_DESCRIPTION("AB8500 battery temperature driver");
1125