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xtensa: support DMA buffers in high memory
[cris-mirror.git] / drivers / power / supply / max17042_battery.c
blob35dde81b1c9b35a8959c50d63e69596491a094c2
1 /*
2 * Fuel gauge driver for Maxim 17042 / 8966 / 8997
3 * Note that Maxim 8966 and 8997 are mfd and this is its subdevice.
4 *
5 * Copyright (C) 2011 Samsung Electronics
6 * MyungJoo Ham <myungjoo.ham@samsung.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * This driver is based on max17040_battery.c
23 */
24
25 #include <linux/acpi.h>
26 #include <linux/init.h>
27 #include <linux/module.h>
28 #include <linux/slab.h>
29 #include <linux/i2c.h>
30 #include <linux/delay.h>
31 #include <linux/interrupt.h>
32 #include <linux/pm.h>
33 #include <linux/mod_devicetable.h>
34 #include <linux/power_supply.h>
35 #include <linux/power/max17042_battery.h>
36 #include <linux/of.h>
37 #include <linux/regmap.h>
38
39 /* Status register bits */
40 #define STATUS_POR_BIT (1 << 1)
41 #define STATUS_BST_BIT (1 << 3)
42 #define STATUS_VMN_BIT (1 << 8)
43 #define STATUS_TMN_BIT (1 << 9)
44 #define STATUS_SMN_BIT (1 << 10)
45 #define STATUS_BI_BIT (1 << 11)
46 #define STATUS_VMX_BIT (1 << 12)
47 #define STATUS_TMX_BIT (1 << 13)
48 #define STATUS_SMX_BIT (1 << 14)
49 #define STATUS_BR_BIT (1 << 15)
50
51 /* Interrupt mask bits */
52 #define CONFIG_ALRT_BIT_ENBL (1 << 2)
53 #define STATUS_INTR_SOCMIN_BIT (1 << 10)
54 #define STATUS_INTR_SOCMAX_BIT (1 << 14)
55
56 #define VFSOC0_LOCK 0x0000
57 #define VFSOC0_UNLOCK 0x0080
58 #define MODEL_UNLOCK1 0X0059
59 #define MODEL_UNLOCK2 0X00C4
60 #define MODEL_LOCK1 0X0000
61 #define MODEL_LOCK2 0X0000
62
63 #define dQ_ACC_DIV 0x4
64 #define dP_ACC_100 0x1900
65 #define dP_ACC_200 0x3200
66
67 #define MAX17042_VMAX_TOLERANCE 50 /* 50 mV */
68
69 struct max17042_chip {
70 struct i2c_client *client;
71 struct regmap *regmap;
72 struct power_supply *battery;
73 enum max170xx_chip_type chip_type;
74 struct max17042_platform_data *pdata;
75 struct work_struct work;
76 int init_complete;
77 };
78
79 static enum power_supply_property max17042_battery_props[] = {
80 POWER_SUPPLY_PROP_STATUS,
81 POWER_SUPPLY_PROP_PRESENT,
82 POWER_SUPPLY_PROP_TECHNOLOGY,
83 POWER_SUPPLY_PROP_CYCLE_COUNT,
84 POWER_SUPPLY_PROP_VOLTAGE_MAX,
85 POWER_SUPPLY_PROP_VOLTAGE_MIN,
86 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
87 POWER_SUPPLY_PROP_VOLTAGE_NOW,
88 POWER_SUPPLY_PROP_VOLTAGE_AVG,
89 POWER_SUPPLY_PROP_VOLTAGE_OCV,
90 POWER_SUPPLY_PROP_CAPACITY,
91 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
92 POWER_SUPPLY_PROP_CHARGE_FULL,
93 POWER_SUPPLY_PROP_CHARGE_NOW,
94 POWER_SUPPLY_PROP_CHARGE_COUNTER,
95 POWER_SUPPLY_PROP_TEMP,
96 POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
97 POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
98 POWER_SUPPLY_PROP_TEMP_MIN,
99 POWER_SUPPLY_PROP_TEMP_MAX,
100 POWER_SUPPLY_PROP_HEALTH,
101 POWER_SUPPLY_PROP_SCOPE,
102 POWER_SUPPLY_PROP_CURRENT_NOW,
103 POWER_SUPPLY_PROP_CURRENT_AVG,
104 };
105
106 static int max17042_get_temperature(struct max17042_chip *chip, int *temp)
107 {
108 int ret;
109 u32 data;
110 struct regmap *map = chip->regmap;
111
112 ret = regmap_read(map, MAX17042_TEMP, &data);
113 if (ret < 0)
114 return ret;
115
116 *temp = sign_extend32(data, 15);
117 /* The value is converted into deci-centigrade scale */
118 /* Units of LSB = 1 / 256 degree Celsius */
119 *temp = *temp * 10 / 256;
120 return 0;
121 }
122
123 static int max17042_get_status(struct max17042_chip *chip, int *status)
124 {
125 int ret, charge_full, charge_now;
126 int avg_current;
127 u32 data;
128
129 ret = power_supply_am_i_supplied(chip->battery);
130 if (ret < 0) {
131 *status = POWER_SUPPLY_STATUS_UNKNOWN;
132 return 0;
133 }
134 if (ret == 0) {
135 *status = POWER_SUPPLY_STATUS_DISCHARGING;
136 return 0;
137 }
138
139 /*
140 * The MAX170xx has builtin end-of-charge detection and will update
141 * FullCAP to match RepCap when it detects end of charging.
142 *
143 * When this cycle the battery gets charged to a higher (calculated)
144 * capacity then the previous cycle then FullCAP will get updated
145 * contineously once end-of-charge detection kicks in, so allow the
146 * 2 to differ a bit.
147 */
148
149 ret = regmap_read(chip->regmap, MAX17042_FullCAP, &charge_full);
150 if (ret < 0)
151 return ret;
152
153 ret = regmap_read(chip->regmap, MAX17042_RepCap, &charge_now);
154 if (ret < 0)
155 return ret;
156
157 if ((charge_full - charge_now) <= MAX17042_FULL_THRESHOLD) {
158 *status = POWER_SUPPLY_STATUS_FULL;
159 return 0;
160 }
161
162 /*
163 * Even though we are supplied, we may still be discharging if the
164 * supply is e.g. only delivering 5V 0.5A. Check current if available.
165 */
166 if (!chip->pdata->enable_current_sense) {
167 *status = POWER_SUPPLY_STATUS_CHARGING;
168 return 0;
169 }
170
171 ret = regmap_read(chip->regmap, MAX17042_AvgCurrent, &data);
172 if (ret < 0)
173 return ret;
174
175 avg_current = sign_extend32(data, 15);
176 avg_current *= 1562500 / chip->pdata->r_sns;
177
178 if (avg_current > 0)
179 *status = POWER_SUPPLY_STATUS_CHARGING;
180 else
181 *status = POWER_SUPPLY_STATUS_DISCHARGING;
182
183 return 0;
184 }
185
186 static int max17042_get_battery_health(struct max17042_chip *chip, int *health)
187 {
188 int temp, vavg, vbatt, ret;
189 u32 val;
190
191 ret = regmap_read(chip->regmap, MAX17042_AvgVCELL, &val);
192 if (ret < 0)
193 goto health_error;
194
195 /* bits [0-3] unused */
196 vavg = val * 625 / 8;
197 /* Convert to millivolts */
198 vavg /= 1000;
199
200 ret = regmap_read(chip->regmap, MAX17042_VCELL, &val);
201 if (ret < 0)
202 goto health_error;
203
204 /* bits [0-3] unused */
205 vbatt = val * 625 / 8;
206 /* Convert to millivolts */
207 vbatt /= 1000;
208
209 if (vavg < chip->pdata->vmin) {
210 *health = POWER_SUPPLY_HEALTH_DEAD;
211 goto out;
212 }
213
214 if (vbatt > chip->pdata->vmax + MAX17042_VMAX_TOLERANCE) {
215 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
216 goto out;
217 }
218
219 ret = max17042_get_temperature(chip, &temp);
220 if (ret < 0)
221 goto health_error;
222
223 if (temp < chip->pdata->temp_min) {
224 *health = POWER_SUPPLY_HEALTH_COLD;
225 goto out;
226 }
227
228 if (temp > chip->pdata->temp_max) {
229 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
230 goto out;
231 }
232
233 *health = POWER_SUPPLY_HEALTH_GOOD;
234
235 out:
236 return 0;
237
238 health_error:
239 return ret;
240 }
241
242 static int max17042_get_property(struct power_supply *psy,
243 enum power_supply_property psp,
244 union power_supply_propval *val)
245 {
246 struct max17042_chip *chip = power_supply_get_drvdata(psy);
247 struct regmap *map = chip->regmap;
248 int ret;
249 u32 data;
250 u64 data64;
251
252 if (!chip->init_complete)
253 return -EAGAIN;
254
255 switch (psp) {
256 case POWER_SUPPLY_PROP_STATUS:
257 ret = max17042_get_status(chip, &val->intval);
258 if (ret < 0)
259 return ret;
260 break;
261 case POWER_SUPPLY_PROP_PRESENT:
262 ret = regmap_read(map, MAX17042_STATUS, &data);
263 if (ret < 0)
264 return ret;
265
266 if (data & MAX17042_STATUS_BattAbsent)
267 val->intval = 0;
268 else
269 val->intval = 1;
270 break;
271 case POWER_SUPPLY_PROP_TECHNOLOGY:
272 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
273 break;
274 case POWER_SUPPLY_PROP_CYCLE_COUNT:
275 ret = regmap_read(map, MAX17042_Cycles, &data);
276 if (ret < 0)
277 return ret;
278
279 val->intval = data;
280 break;
281 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
282 ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
283 if (ret < 0)
284 return ret;
285
286 val->intval = data >> 8;
287 val->intval *= 20000; /* Units of LSB = 20mV */
288 break;
289 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
290 ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
291 if (ret < 0)
292 return ret;
293
294 val->intval = (data & 0xff) * 20000; /* Units of 20mV */
295 break;
296 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
297 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
298 ret = regmap_read(map, MAX17042_V_empty, &data);
299 else
300 ret = regmap_read(map, MAX17047_V_empty, &data);
301 if (ret < 0)
302 return ret;
303
304 val->intval = data >> 7;
305 val->intval *= 10000; /* Units of LSB = 10mV */
306 break;
307 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
308 ret = regmap_read(map, MAX17042_VCELL, &data);
309 if (ret < 0)
310 return ret;
311
312 val->intval = data * 625 / 8;
313 break;
314 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
315 ret = regmap_read(map, MAX17042_AvgVCELL, &data);
316 if (ret < 0)
317 return ret;
318
319 val->intval = data * 625 / 8;
320 break;
321 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
322 ret = regmap_read(map, MAX17042_OCVInternal, &data);
323 if (ret < 0)
324 return ret;
325
326 val->intval = data * 625 / 8;
327 break;
328 case POWER_SUPPLY_PROP_CAPACITY:
329 ret = regmap_read(map, MAX17042_RepSOC, &data);
330 if (ret < 0)
331 return ret;
332
333 val->intval = data >> 8;
334 break;
335 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
336 ret = regmap_read(map, MAX17042_DesignCap, &data);
337 if (ret < 0)
338 return ret;
339
340 data64 = data * 5000000ll;
341 do_div(data64, chip->pdata->r_sns);
342 val->intval = data64;
343 break;
344 case POWER_SUPPLY_PROP_CHARGE_FULL:
345 ret = regmap_read(map, MAX17042_FullCAP, &data);
346 if (ret < 0)
347 return ret;
348
349 data64 = data * 5000000ll;
350 do_div(data64, chip->pdata->r_sns);
351 val->intval = data64;
352 break;
353 case POWER_SUPPLY_PROP_CHARGE_NOW:
354 ret = regmap_read(map, MAX17042_RepCap, &data);
355 if (ret < 0)
356 return ret;
357
358 data64 = data * 5000000ll;
359 do_div(data64, chip->pdata->r_sns);
360 val->intval = data64;
361 break;
362 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
363 ret = regmap_read(map, MAX17042_QH, &data);
364 if (ret < 0)
365 return ret;
366
367 val->intval = data * 1000 / 2;
368 break;
369 case POWER_SUPPLY_PROP_TEMP:
370 ret = max17042_get_temperature(chip, &val->intval);
371 if (ret < 0)
372 return ret;
373 break;
374 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
375 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
376 if (ret < 0)
377 return ret;
378 /* LSB is Alert Minimum. In deci-centigrade */
379 val->intval = sign_extend32(data & 0xff, 7) * 10;
380 break;
381 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
382 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
383 if (ret < 0)
384 return ret;
385 /* MSB is Alert Maximum. In deci-centigrade */
386 val->intval = sign_extend32(data >> 8, 7) * 10;
387 break;
388 case POWER_SUPPLY_PROP_TEMP_MIN:
389 val->intval = chip->pdata->temp_min;
390 break;
391 case POWER_SUPPLY_PROP_TEMP_MAX:
392 val->intval = chip->pdata->temp_max;
393 break;
394 case POWER_SUPPLY_PROP_HEALTH:
395 ret = max17042_get_battery_health(chip, &val->intval);
396 if (ret < 0)
397 return ret;
398 break;
399 case POWER_SUPPLY_PROP_SCOPE:
400 val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
401 break;
402 case POWER_SUPPLY_PROP_CURRENT_NOW:
403 if (chip->pdata->enable_current_sense) {
404 ret = regmap_read(map, MAX17042_Current, &data);
405 if (ret < 0)
406 return ret;
407
408 val->intval = sign_extend32(data, 15);
409 val->intval *= 1562500 / chip->pdata->r_sns;
410 } else {
411 return -EINVAL;
412 }
413 break;
414 case POWER_SUPPLY_PROP_CURRENT_AVG:
415 if (chip->pdata->enable_current_sense) {
416 ret = regmap_read(map, MAX17042_AvgCurrent, &data);
417 if (ret < 0)
418 return ret;
419
420 val->intval = sign_extend32(data, 15);
421 val->intval *= 1562500 / chip->pdata->r_sns;
422 } else {
423 return -EINVAL;
424 }
425 break;
426 default:
427 return -EINVAL;
428 }
429 return 0;
430 }
431
432 static int max17042_set_property(struct power_supply *psy,
433 enum power_supply_property psp,
434 const union power_supply_propval *val)
435 {
436 struct max17042_chip *chip = power_supply_get_drvdata(psy);
437 struct regmap *map = chip->regmap;
438 int ret = 0;
439 u32 data;
440 int8_t temp;
441
442 switch (psp) {
443 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
444 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
445 if (ret < 0)
446 return ret;
447
448 /* Input in deci-centigrade, convert to centigrade */
449 temp = val->intval / 10;
450 /* force min < max */
451 if (temp >= (int8_t)(data >> 8))
452 temp = (int8_t)(data >> 8) - 1;
453 /* Write both MAX and MIN ALERT */
454 data = (data & 0xff00) + temp;
455 ret = regmap_write(map, MAX17042_TALRT_Th, data);
456 break;
457 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
458 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
459 if (ret < 0)
460 return ret;
461
462 /* Input in Deci-Centigrade, convert to centigrade */
463 temp = val->intval / 10;
464 /* force max > min */
465 if (temp <= (int8_t)(data & 0xff))
466 temp = (int8_t)(data & 0xff) + 1;
467 /* Write both MAX and MIN ALERT */
468 data = (data & 0xff) + (temp << 8);
469 ret = regmap_write(map, MAX17042_TALRT_Th, data);
470 break;
471 default:
472 ret = -EINVAL;
473 }
474
475 return ret;
476 }
477
478 static int max17042_property_is_writeable(struct power_supply *psy,
479 enum power_supply_property psp)
480 {
481 int ret;
482
483 switch (psp) {
484 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
485 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
486 ret = 1;
487 break;
488 default:
489 ret = 0;
490 }
491
492 return ret;
493 }
494
495 static void max17042_external_power_changed(struct power_supply *psy)
496 {
497 power_supply_changed(psy);
498 }
499
500 static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value)
501 {
502 int retries = 8;
503 int ret;
504 u32 read_value;
505
506 do {
507 ret = regmap_write(map, reg, value);
508 regmap_read(map, reg, &read_value);
509 if (read_value != value) {
510 ret = -EIO;
511 retries--;
512 }
513 } while (retries && read_value != value);
514
515 if (ret < 0)
516 pr_err("%s: err %d\n", __func__, ret);
517
518 return ret;
519 }
520
521 static inline void max17042_override_por(struct regmap *map,
522 u8 reg, u16 value)
523 {
524 if (value)
525 regmap_write(map, reg, value);
526 }
527
528 static inline void max10742_unlock_model(struct max17042_chip *chip)
529 {
530 struct regmap *map = chip->regmap;
531
532 regmap_write(map, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
533 regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
534 }
535
536 static inline void max10742_lock_model(struct max17042_chip *chip)
537 {
538 struct regmap *map = chip->regmap;
539
540 regmap_write(map, MAX17042_MLOCKReg1, MODEL_LOCK1);
541 regmap_write(map, MAX17042_MLOCKReg2, MODEL_LOCK2);
542 }
543
544 static inline void max17042_write_model_data(struct max17042_chip *chip,
545 u8 addr, int size)
546 {
547 struct regmap *map = chip->regmap;
548 int i;
549
550 for (i = 0; i < size; i++)
551 regmap_write(map, addr + i,
552 chip->pdata->config_data->cell_char_tbl[i]);
553 }
554
555 static inline void max17042_read_model_data(struct max17042_chip *chip,
556 u8 addr, u16 *data, int size)
557 {
558 struct regmap *map = chip->regmap;
559 int i;
560 u32 tmp;
561
562 for (i = 0; i < size; i++) {
563 regmap_read(map, addr + i, &tmp);
564 data[i] = (u16)tmp;
565 }
566 }
567
568 static inline int max17042_model_data_compare(struct max17042_chip *chip,
569 u16 *data1, u16 *data2, int size)
570 {
571 int i;
572
573 if (memcmp(data1, data2, size)) {
574 dev_err(&chip->client->dev, "%s compare failed\n", __func__);
575 for (i = 0; i < size; i++)
576 dev_info(&chip->client->dev, "0x%x, 0x%x",
577 data1[i], data2[i]);
578 dev_info(&chip->client->dev, "\n");
579 return -EINVAL;
580 }
581 return 0;
582 }
583
584 static int max17042_init_model(struct max17042_chip *chip)
585 {
586 int ret;
587 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
588 u16 *temp_data;
589
590 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
591 if (!temp_data)
592 return -ENOMEM;
593
594 max10742_unlock_model(chip);
595 max17042_write_model_data(chip, MAX17042_MODELChrTbl,
596 table_size);
597 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
598 table_size);
599
600 ret = max17042_model_data_compare(
601 chip,
602 chip->pdata->config_data->cell_char_tbl,
603 temp_data,
604 table_size);
605
606 max10742_lock_model(chip);
607 kfree(temp_data);
608
609 return ret;
610 }
611
612 static int max17042_verify_model_lock(struct max17042_chip *chip)
613 {
614 int i;
615 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
616 u16 *temp_data;
617 int ret = 0;
618
619 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
620 if (!temp_data)
621 return -ENOMEM;
622
623 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
624 table_size);
625 for (i = 0; i < table_size; i++)
626 if (temp_data[i])
627 ret = -EINVAL;
628
629 kfree(temp_data);
630 return ret;
631 }
632
633 static void max17042_write_config_regs(struct max17042_chip *chip)
634 {
635 struct max17042_config_data *config = chip->pdata->config_data;
636 struct regmap *map = chip->regmap;
637
638 regmap_write(map, MAX17042_CONFIG, config->config);
639 regmap_write(map, MAX17042_LearnCFG, config->learn_cfg);
640 regmap_write(map, MAX17042_FilterCFG,
641 config->filter_cfg);
642 regmap_write(map, MAX17042_RelaxCFG, config->relax_cfg);
643 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047 ||
644 chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)
645 regmap_write(map, MAX17047_FullSOCThr,
646 config->full_soc_thresh);
647 }
648
649 static void max17042_write_custom_regs(struct max17042_chip *chip)
650 {
651 struct max17042_config_data *config = chip->pdata->config_data;
652 struct regmap *map = chip->regmap;
653
654 max17042_write_verify_reg(map, MAX17042_RCOMP0, config->rcomp0);
655 max17042_write_verify_reg(map, MAX17042_TempCo, config->tcompc0);
656 max17042_write_verify_reg(map, MAX17042_ICHGTerm, config->ichgt_term);
657 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) {
658 regmap_write(map, MAX17042_EmptyTempCo, config->empty_tempco);
659 max17042_write_verify_reg(map, MAX17042_K_empty0,
660 config->kempty0);
661 } else {
662 max17042_write_verify_reg(map, MAX17047_QRTbl00,
663 config->qrtbl00);
664 max17042_write_verify_reg(map, MAX17047_QRTbl10,
665 config->qrtbl10);
666 max17042_write_verify_reg(map, MAX17047_QRTbl20,
667 config->qrtbl20);
668 max17042_write_verify_reg(map, MAX17047_QRTbl30,
669 config->qrtbl30);
670 }
671 }
672
673 static void max17042_update_capacity_regs(struct max17042_chip *chip)
674 {
675 struct max17042_config_data *config = chip->pdata->config_data;
676 struct regmap *map = chip->regmap;
677
678 max17042_write_verify_reg(map, MAX17042_FullCAP,
679 config->fullcap);
680 regmap_write(map, MAX17042_DesignCap, config->design_cap);
681 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
682 config->fullcapnom);
683 }
684
685 static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
686 {
687 unsigned int vfSoc;
688 struct regmap *map = chip->regmap;
689
690 regmap_read(map, MAX17042_VFSOC, &vfSoc);
691 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
692 max17042_write_verify_reg(map, MAX17042_VFSOC0, vfSoc);
693 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
694 }
695
696 static void max17042_load_new_capacity_params(struct max17042_chip *chip)
697 {
698 u32 full_cap0, rep_cap, dq_acc, vfSoc;
699 u32 rem_cap;
700
701 struct max17042_config_data *config = chip->pdata->config_data;
702 struct regmap *map = chip->regmap;
703
704 regmap_read(map, MAX17042_FullCAP0, &full_cap0);
705 regmap_read(map, MAX17042_VFSOC, &vfSoc);
706
707 /* fg_vfSoc needs to shifted by 8 bits to get the
708 * perc in 1% accuracy, to get the right rem_cap multiply
709 * full_cap0, fg_vfSoc and devide by 100
710 */
711 rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
712 max17042_write_verify_reg(map, MAX17042_RemCap, rem_cap);
713
714 rep_cap = rem_cap;
715 max17042_write_verify_reg(map, MAX17042_RepCap, rep_cap);
716
717 /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
718 dq_acc = config->fullcap / dQ_ACC_DIV;
719 max17042_write_verify_reg(map, MAX17042_dQacc, dq_acc);
720 max17042_write_verify_reg(map, MAX17042_dPacc, dP_ACC_200);
721
722 max17042_write_verify_reg(map, MAX17042_FullCAP,
723 config->fullcap);
724 regmap_write(map, MAX17042_DesignCap,
725 config->design_cap);
726 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
727 config->fullcapnom);
728 /* Update SOC register with new SOC */
729 regmap_write(map, MAX17042_RepSOC, vfSoc);
730 }
731
732 /*
733 * Block write all the override values coming from platform data.
734 * This function MUST be called before the POR initialization proceedure
735 * specified by maxim.
736 */
737 static inline void max17042_override_por_values(struct max17042_chip *chip)
738 {
739 struct regmap *map = chip->regmap;
740 struct max17042_config_data *config = chip->pdata->config_data;
741
742 max17042_override_por(map, MAX17042_TGAIN, config->tgain);
743 max17042_override_por(map, MAx17042_TOFF, config->toff);
744 max17042_override_por(map, MAX17042_CGAIN, config->cgain);
745 max17042_override_por(map, MAX17042_COFF, config->coff);
746
747 max17042_override_por(map, MAX17042_VALRT_Th, config->valrt_thresh);
748 max17042_override_por(map, MAX17042_TALRT_Th, config->talrt_thresh);
749 max17042_override_por(map, MAX17042_SALRT_Th,
750 config->soc_alrt_thresh);
751 max17042_override_por(map, MAX17042_CONFIG, config->config);
752 max17042_override_por(map, MAX17042_SHDNTIMER, config->shdntimer);
753
754 max17042_override_por(map, MAX17042_DesignCap, config->design_cap);
755 max17042_override_por(map, MAX17042_ICHGTerm, config->ichgt_term);
756
757 max17042_override_por(map, MAX17042_AtRate, config->at_rate);
758 max17042_override_por(map, MAX17042_LearnCFG, config->learn_cfg);
759 max17042_override_por(map, MAX17042_FilterCFG, config->filter_cfg);
760 max17042_override_por(map, MAX17042_RelaxCFG, config->relax_cfg);
761 max17042_override_por(map, MAX17042_MiscCFG, config->misc_cfg);
762 max17042_override_por(map, MAX17042_MaskSOC, config->masksoc);
763
764 max17042_override_por(map, MAX17042_FullCAP, config->fullcap);
765 max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom);
766 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
767 max17042_override_por(map, MAX17042_SOC_empty,
768 config->socempty);
769 max17042_override_por(map, MAX17042_LAvg_empty, config->lavg_empty);
770 max17042_override_por(map, MAX17042_dQacc, config->dqacc);
771 max17042_override_por(map, MAX17042_dPacc, config->dpacc);
772
773 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
774 max17042_override_por(map, MAX17042_V_empty, config->vempty);
775 else
776 max17042_override_por(map, MAX17047_V_empty, config->vempty);
777 max17042_override_por(map, MAX17042_TempNom, config->temp_nom);
778 max17042_override_por(map, MAX17042_TempLim, config->temp_lim);
779 max17042_override_por(map, MAX17042_FCTC, config->fctc);
780 max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0);
781 max17042_override_por(map, MAX17042_TempCo, config->tcompc0);
782 if (chip->chip_type) {
783 max17042_override_por(map, MAX17042_EmptyTempCo,
784 config->empty_tempco);
785 max17042_override_por(map, MAX17042_K_empty0,
786 config->kempty0);
787 }
788 }
789
790 static int max17042_init_chip(struct max17042_chip *chip)
791 {
792 struct regmap *map = chip->regmap;
793 int ret;
794
795 max17042_override_por_values(chip);
796 /* After Power up, the MAX17042 requires 500mS in order
797 * to perform signal debouncing and initial SOC reporting
798 */
799 msleep(500);
800
801 /* Initialize configaration */
802 max17042_write_config_regs(chip);
803
804 /* write cell characterization data */
805 ret = max17042_init_model(chip);
806 if (ret) {
807 dev_err(&chip->client->dev, "%s init failed\n",
808 __func__);
809 return -EIO;
810 }
811
812 ret = max17042_verify_model_lock(chip);
813 if (ret) {
814 dev_err(&chip->client->dev, "%s lock verify failed\n",
815 __func__);
816 return -EIO;
817 }
818 /* write custom parameters */
819 max17042_write_custom_regs(chip);
820
821 /* update capacity params */
822 max17042_update_capacity_regs(chip);
823
824 /* delay must be atleast 350mS to allow VFSOC
825 * to be calculated from the new configuration
826 */
827 msleep(350);
828
829 /* reset vfsoc0 reg */
830 max17042_reset_vfsoc0_reg(chip);
831
832 /* load new capacity params */
833 max17042_load_new_capacity_params(chip);
834
835 /* Init complete, Clear the POR bit */
836 regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0);
837 return 0;
838 }
839
840 static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
841 {
842 struct regmap *map = chip->regmap;
843 u32 soc, soc_tr;
844
845 /* program interrupt thesholds such that we should
846 * get interrupt for every 'off' perc change in the soc
847 */
848 regmap_read(map, MAX17042_RepSOC, &soc);
849 soc >>= 8;
850 soc_tr = (soc + off) << 8;
851 soc_tr |= (soc - off);
852 regmap_write(map, MAX17042_SALRT_Th, soc_tr);
853 }
854
855 static irqreturn_t max17042_thread_handler(int id, void *dev)
856 {
857 struct max17042_chip *chip = dev;
858 u32 val;
859
860 regmap_read(chip->regmap, MAX17042_STATUS, &val);
861 if ((val & STATUS_INTR_SOCMIN_BIT) ||
862 (val & STATUS_INTR_SOCMAX_BIT)) {
863 dev_info(&chip->client->dev, "SOC threshold INTR\n");
864 max17042_set_soc_threshold(chip, 1);
865 }
866
867 power_supply_changed(chip->battery);
868 return IRQ_HANDLED;
869 }
870
871 static void max17042_init_worker(struct work_struct *work)
872 {
873 struct max17042_chip *chip = container_of(work,
874 struct max17042_chip, work);
875 int ret;
876
877 /* Initialize registers according to values from the platform data */
878 if (chip->pdata->enable_por_init && chip->pdata->config_data) {
879 ret = max17042_init_chip(chip);
880 if (ret)
881 return;
882 }
883
884 chip->init_complete = 1;
885 }
886
887 #ifdef CONFIG_OF
888 static struct max17042_platform_data *
889 max17042_get_of_pdata(struct max17042_chip *chip)
890 {
891 struct device *dev = &chip->client->dev;
892 struct device_node *np = dev->of_node;
893 u32 prop;
894 struct max17042_platform_data *pdata;
895
896 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
897 if (!pdata)
898 return NULL;
899
900 /*
901 * Require current sense resistor value to be specified for
902 * current-sense functionality to be enabled at all.
903 */
904 if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
905 pdata->r_sns = prop;
906 pdata->enable_current_sense = true;
907 }
908
909 if (of_property_read_s32(np, "maxim,cold-temp", &pdata->temp_min))
910 pdata->temp_min = INT_MIN;
911 if (of_property_read_s32(np, "maxim,over-heat-temp", &pdata->temp_max))
912 pdata->temp_max = INT_MAX;
913 if (of_property_read_s32(np, "maxim,dead-volt", &pdata->vmin))
914 pdata->vmin = INT_MIN;
915 if (of_property_read_s32(np, "maxim,over-volt", &pdata->vmax))
916 pdata->vmax = INT_MAX;
917
918 return pdata;
919 }
920 #endif
921
922 static struct max17042_reg_data max17047_default_pdata_init_regs[] = {
923 /*
924 * Some firmwares do not set FullSOCThr, Enable End-of-Charge Detection
925 * when the voltage FG reports 95%, as recommended in the datasheet.
926 */
927 { MAX17047_FullSOCThr, MAX17042_BATTERY_FULL << 8 },
928 };
929
930 static struct max17042_platform_data *
931 max17042_get_default_pdata(struct max17042_chip *chip)
932 {
933 struct device *dev = &chip->client->dev;
934 struct max17042_platform_data *pdata;
935 int ret, misc_cfg;
936
937 /*
938 * The MAX17047 gets used on x86 where we might not have pdata, assume
939 * the firmware will already have initialized the fuel-gauge and provide
940 * default values for the non init bits to make things work.
941 */
942 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
943 if (!pdata)
944 return pdata;
945
946 if (chip->chip_type != MAXIM_DEVICE_TYPE_MAX17042) {
947 pdata->init_data = max17047_default_pdata_init_regs;
948 pdata->num_init_data =
949 ARRAY_SIZE(max17047_default_pdata_init_regs);
950 }
951
952 ret = regmap_read(chip->regmap, MAX17042_MiscCFG, &misc_cfg);
953 if (ret < 0)
954 return NULL;
955
956 /* If bits 0-1 are set to 3 then only Voltage readings are used */
957 if ((misc_cfg & 0x3) == 0x3)
958 pdata->enable_current_sense = false;
959 else
960 pdata->enable_current_sense = true;
961
962 pdata->vmin = MAX17042_DEFAULT_VMIN;
963 pdata->vmax = MAX17042_DEFAULT_VMAX;
964 pdata->temp_min = MAX17042_DEFAULT_TEMP_MIN;
965 pdata->temp_max = MAX17042_DEFAULT_TEMP_MAX;
966
967 return pdata;
968 }
969
970 static struct max17042_platform_data *
971 max17042_get_pdata(struct max17042_chip *chip)
972 {
973 struct device *dev = &chip->client->dev;
974
975 #ifdef CONFIG_OF
976 if (dev->of_node)
977 return max17042_get_of_pdata(chip);
978 #endif
979 if (dev->platform_data)
980 return dev->platform_data;
981
982 return max17042_get_default_pdata(chip);
983 }
984
985 static const struct regmap_config max17042_regmap_config = {
986 .reg_bits = 8,
987 .val_bits = 16,
988 .val_format_endian = REGMAP_ENDIAN_NATIVE,
989 };
990
991 static const struct power_supply_desc max17042_psy_desc = {
992 .name = "max170xx_battery",
993 .type = POWER_SUPPLY_TYPE_BATTERY,
994 .get_property = max17042_get_property,
995 .set_property = max17042_set_property,
996 .property_is_writeable = max17042_property_is_writeable,
997 .external_power_changed = max17042_external_power_changed,
998 .properties = max17042_battery_props,
999 .num_properties = ARRAY_SIZE(max17042_battery_props),
1000 };
1001
1002 static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
1003 .name = "max170xx_battery",
1004 .type = POWER_SUPPLY_TYPE_BATTERY,
1005 .get_property = max17042_get_property,
1006 .set_property = max17042_set_property,
1007 .property_is_writeable = max17042_property_is_writeable,
1008 .properties = max17042_battery_props,
1009 .num_properties = ARRAY_SIZE(max17042_battery_props) - 2,
1010 };
1011
1012 static int max17042_probe(struct i2c_client *client,
1013 const struct i2c_device_id *id)
1014 {
1015 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
1016 const struct power_supply_desc *max17042_desc = &max17042_psy_desc;
1017 struct power_supply_config psy_cfg = {};
1018 const struct acpi_device_id *acpi_id = NULL;
1019 struct device *dev = &client->dev;
1020 struct max17042_chip *chip;
1021 int ret;
1022 int i;
1023 u32 val;
1024
1025 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
1026 return -EIO;
1027
1028 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
1029 if (!chip)
1030 return -ENOMEM;
1031
1032 chip->client = client;
1033 if (id) {
1034 chip->chip_type = id->driver_data;
1035 } else {
1036 acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
1037 if (!acpi_id)
1038 return -ENODEV;
1039
1040 chip->chip_type = acpi_id->driver_data;
1041 }
1042 chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config);
1043 if (IS_ERR(chip->regmap)) {
1044 dev_err(&client->dev, "Failed to initialize regmap\n");
1045 return -EINVAL;
1046 }
1047
1048 chip->pdata = max17042_get_pdata(chip);
1049 if (!chip->pdata) {
1050 dev_err(&client->dev, "no platform data provided\n");
1051 return -EINVAL;
1052 }
1053
1054 i2c_set_clientdata(client, chip);
1055 psy_cfg.drv_data = chip;
1056
1057 /* When current is not measured,
1058 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
1059 if (!chip->pdata->enable_current_sense)
1060 max17042_desc = &max17042_no_current_sense_psy_desc;
1061
1062 if (chip->pdata->r_sns == 0)
1063 chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
1064
1065 if (chip->pdata->init_data)
1066 for (i = 0; i < chip->pdata->num_init_data; i++)
1067 regmap_write(chip->regmap,
1068 chip->pdata->init_data[i].addr,
1069 chip->pdata->init_data[i].data);
1070
1071 if (!chip->pdata->enable_current_sense) {
1072 regmap_write(chip->regmap, MAX17042_CGAIN, 0x0000);
1073 regmap_write(chip->regmap, MAX17042_MiscCFG, 0x0003);
1074 regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007);
1075 }
1076
1077 chip->battery = devm_power_supply_register(&client->dev, max17042_desc,
1078 &psy_cfg);
1079 if (IS_ERR(chip->battery)) {
1080 dev_err(&client->dev, "failed: power supply register\n");
1081 return PTR_ERR(chip->battery);
1082 }
1083
1084 if (client->irq) {
1085 unsigned int flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
1086
1087 /*
1088 * On ACPI systems the IRQ may be handled by ACPI-event code,
1089 * so we need to share (if the ACPI code is willing to share).
1090 */
1091 if (acpi_id)
1092 flags |= IRQF_SHARED | IRQF_PROBE_SHARED;
1093
1094 ret = devm_request_threaded_irq(&client->dev, client->irq,
1095 NULL,
1096 max17042_thread_handler, flags,
1097 chip->battery->desc->name,
1098 chip);
1099 if (!ret) {
1100 regmap_update_bits(chip->regmap, MAX17042_CONFIG,
1101 CONFIG_ALRT_BIT_ENBL,
1102 CONFIG_ALRT_BIT_ENBL);
1103 max17042_set_soc_threshold(chip, 1);
1104 } else {
1105 client->irq = 0;
1106 if (ret != -EBUSY)
1107 dev_err(&client->dev, "Failed to get IRQ\n");
1108 }
1109 }
1110 /* Not able to update the charge threshold when exceeded? -> disable */
1111 if (!client->irq)
1112 regmap_write(chip->regmap, MAX17042_SALRT_Th, 0xff00);
1113
1114 regmap_read(chip->regmap, MAX17042_STATUS, &val);
1115 if (val & STATUS_POR_BIT) {
1116 INIT_WORK(&chip->work, max17042_init_worker);
1117 schedule_work(&chip->work);
1118 } else {
1119 chip->init_complete = 1;
1120 }
1121
1122 return 0;
1123 }
1124
1125 #ifdef CONFIG_PM_SLEEP
1126 static int max17042_suspend(struct device *dev)
1127 {
1128 struct max17042_chip *chip = dev_get_drvdata(dev);
1129
1130 /*
1131 * disable the irq and enable irq_wake
1132 * capability to the interrupt line.
1133 */
1134 if (chip->client->irq) {
1135 disable_irq(chip->client->irq);
1136 enable_irq_wake(chip->client->irq);
1137 }
1138
1139 return 0;
1140 }
1141
1142 static int max17042_resume(struct device *dev)
1143 {
1144 struct max17042_chip *chip = dev_get_drvdata(dev);
1145
1146 if (chip->client->irq) {
1147 disable_irq_wake(chip->client->irq);
1148 enable_irq(chip->client->irq);
1149 /* re-program the SOC thresholds to 1% change */
1150 max17042_set_soc_threshold(chip, 1);
1151 }
1152
1153 return 0;
1154 }
1155 #endif
1156
1157 static SIMPLE_DEV_PM_OPS(max17042_pm_ops, max17042_suspend,
1158 max17042_resume);
1159
1160 #ifdef CONFIG_ACPI
1161 static const struct acpi_device_id max17042_acpi_match[] = {
1162 { "MAX17047", MAXIM_DEVICE_TYPE_MAX17047 },
1163 { }
1164 };
1165 MODULE_DEVICE_TABLE(acpi, max17042_acpi_match);
1166 #endif
1167
1168 #ifdef CONFIG_OF
1169 static const struct of_device_id max17042_dt_match[] = {
1170 { .compatible = "maxim,max17042" },
1171 { .compatible = "maxim,max17047" },
1172 { .compatible = "maxim,max17050" },
1173 { },
1174 };
1175 MODULE_DEVICE_TABLE(of, max17042_dt_match);
1176 #endif
1177
1178 static const struct i2c_device_id max17042_id[] = {
1179 { "max17042", MAXIM_DEVICE_TYPE_MAX17042 },
1180 { "max17047", MAXIM_DEVICE_TYPE_MAX17047 },
1181 { "max17050", MAXIM_DEVICE_TYPE_MAX17050 },
1182 { }
1183 };
1184 MODULE_DEVICE_TABLE(i2c, max17042_id);
1185
1186 static struct i2c_driver max17042_i2c_driver = {
1187 .driver = {
1188 .name = "max17042",
1189 .acpi_match_table = ACPI_PTR(max17042_acpi_match),
1190 .of_match_table = of_match_ptr(max17042_dt_match),
1191 .pm = &max17042_pm_ops,
1192 },
1193 .probe = max17042_probe,
1194 .id_table = max17042_id,
1195 };
1196 module_i2c_driver(max17042_i2c_driver);
1197
1198 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1199 MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
1200 MODULE_LICENSE("GPL");
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