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sh_eth: fix EESIPR values for SH77{34|63}
[linux/fpc-iii.git] / drivers / power / supply / max17042_battery.c
blobda7a75f824891200f9db4c9dd4d274c5125d3dd8
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/init.h>
26 #include <linux/module.h>
27 #include <linux/slab.h>
28 #include <linux/i2c.h>
29 #include <linux/delay.h>
30 #include <linux/interrupt.h>
31 #include <linux/pm.h>
32 #include <linux/mod_devicetable.h>
33 #include <linux/power_supply.h>
34 #include <linux/power/max17042_battery.h>
35 #include <linux/of.h>
36 #include <linux/regmap.h>
37
38 /* Status register bits */
39 #define STATUS_POR_BIT (1 << 1)
40 #define STATUS_BST_BIT (1 << 3)
41 #define STATUS_VMN_BIT (1 << 8)
42 #define STATUS_TMN_BIT (1 << 9)
43 #define STATUS_SMN_BIT (1 << 10)
44 #define STATUS_BI_BIT (1 << 11)
45 #define STATUS_VMX_BIT (1 << 12)
46 #define STATUS_TMX_BIT (1 << 13)
47 #define STATUS_SMX_BIT (1 << 14)
48 #define STATUS_BR_BIT (1 << 15)
49
50 /* Interrupt mask bits */
51 #define CONFIG_ALRT_BIT_ENBL (1 << 2)
52 #define STATUS_INTR_SOCMIN_BIT (1 << 10)
53 #define STATUS_INTR_SOCMAX_BIT (1 << 14)
54
55 #define VFSOC0_LOCK 0x0000
56 #define VFSOC0_UNLOCK 0x0080
57 #define MODEL_UNLOCK1 0X0059
58 #define MODEL_UNLOCK2 0X00C4
59 #define MODEL_LOCK1 0X0000
60 #define MODEL_LOCK2 0X0000
61
62 #define dQ_ACC_DIV 0x4
63 #define dP_ACC_100 0x1900
64 #define dP_ACC_200 0x3200
65
66 #define MAX17042_VMAX_TOLERANCE 50 /* 50 mV */
67
68 struct max17042_chip {
69 struct i2c_client *client;
70 struct regmap *regmap;
71 struct power_supply *battery;
72 enum max170xx_chip_type chip_type;
73 struct max17042_platform_data *pdata;
74 struct work_struct work;
75 int init_complete;
76 };
77
78 static enum power_supply_property max17042_battery_props[] = {
79 POWER_SUPPLY_PROP_PRESENT,
80 POWER_SUPPLY_PROP_CYCLE_COUNT,
81 POWER_SUPPLY_PROP_VOLTAGE_MAX,
82 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
83 POWER_SUPPLY_PROP_VOLTAGE_NOW,
84 POWER_SUPPLY_PROP_VOLTAGE_AVG,
85 POWER_SUPPLY_PROP_VOLTAGE_OCV,
86 POWER_SUPPLY_PROP_CAPACITY,
87 POWER_SUPPLY_PROP_CHARGE_FULL,
88 POWER_SUPPLY_PROP_CHARGE_COUNTER,
89 POWER_SUPPLY_PROP_TEMP,
90 POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
91 POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
92 POWER_SUPPLY_PROP_TEMP_MIN,
93 POWER_SUPPLY_PROP_TEMP_MAX,
94 POWER_SUPPLY_PROP_HEALTH,
95 POWER_SUPPLY_PROP_CURRENT_NOW,
96 POWER_SUPPLY_PROP_CURRENT_AVG,
97 };
98
99 static int max17042_get_temperature(struct max17042_chip *chip, int *temp)
100 {
101 int ret;
102 u32 data;
103 struct regmap *map = chip->regmap;
104
105 ret = regmap_read(map, MAX17042_TEMP, &data);
106 if (ret < 0)
107 return ret;
108
109 *temp = data;
110 /* The value is signed. */
111 if (*temp & 0x8000) {
112 *temp = (0x7fff & ~*temp) + 1;
113 *temp *= -1;
114 }
115
116 /* The value is converted into deci-centigrade scale */
117 /* Units of LSB = 1 / 256 degree Celsius */
118 *temp = *temp * 10 / 256;
119 return 0;
120 }
121
122 static int max17042_get_battery_health(struct max17042_chip *chip, int *health)
123 {
124 int temp, vavg, vbatt, ret;
125 u32 val;
126
127 ret = regmap_read(chip->regmap, MAX17042_AvgVCELL, &val);
128 if (ret < 0)
129 goto health_error;
130
131 /* bits [0-3] unused */
132 vavg = val * 625 / 8;
133 /* Convert to millivolts */
134 vavg /= 1000;
135
136 ret = regmap_read(chip->regmap, MAX17042_VCELL, &val);
137 if (ret < 0)
138 goto health_error;
139
140 /* bits [0-3] unused */
141 vbatt = val * 625 / 8;
142 /* Convert to millivolts */
143 vbatt /= 1000;
144
145 if (vavg < chip->pdata->vmin) {
146 *health = POWER_SUPPLY_HEALTH_DEAD;
147 goto out;
148 }
149
150 if (vbatt > chip->pdata->vmax + MAX17042_VMAX_TOLERANCE) {
151 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
152 goto out;
153 }
154
155 ret = max17042_get_temperature(chip, &temp);
156 if (ret < 0)
157 goto health_error;
158
159 if (temp <= chip->pdata->temp_min) {
160 *health = POWER_SUPPLY_HEALTH_COLD;
161 goto out;
162 }
163
164 if (temp >= chip->pdata->temp_max) {
165 *health = POWER_SUPPLY_HEALTH_OVERHEAT;
166 goto out;
167 }
168
169 *health = POWER_SUPPLY_HEALTH_GOOD;
170
171 out:
172 return 0;
173
174 health_error:
175 return ret;
176 }
177
178 static int max17042_get_property(struct power_supply *psy,
179 enum power_supply_property psp,
180 union power_supply_propval *val)
181 {
182 struct max17042_chip *chip = power_supply_get_drvdata(psy);
183 struct regmap *map = chip->regmap;
184 int ret;
185 u32 data;
186
187 if (!chip->init_complete)
188 return -EAGAIN;
189
190 switch (psp) {
191 case POWER_SUPPLY_PROP_PRESENT:
192 ret = regmap_read(map, MAX17042_STATUS, &data);
193 if (ret < 0)
194 return ret;
195
196 if (data & MAX17042_STATUS_BattAbsent)
197 val->intval = 0;
198 else
199 val->intval = 1;
200 break;
201 case POWER_SUPPLY_PROP_CYCLE_COUNT:
202 ret = regmap_read(map, MAX17042_Cycles, &data);
203 if (ret < 0)
204 return ret;
205
206 val->intval = data;
207 break;
208 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
209 ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
210 if (ret < 0)
211 return ret;
212
213 val->intval = data >> 8;
214 val->intval *= 20000; /* Units of LSB = 20mV */
215 break;
216 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
217 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
218 ret = regmap_read(map, MAX17042_V_empty, &data);
219 else
220 ret = regmap_read(map, MAX17047_V_empty, &data);
221 if (ret < 0)
222 return ret;
223
224 val->intval = data >> 7;
225 val->intval *= 10000; /* Units of LSB = 10mV */
226 break;
227 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
228 ret = regmap_read(map, MAX17042_VCELL, &data);
229 if (ret < 0)
230 return ret;
231
232 val->intval = data * 625 / 8;
233 break;
234 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
235 ret = regmap_read(map, MAX17042_AvgVCELL, &data);
236 if (ret < 0)
237 return ret;
238
239 val->intval = data * 625 / 8;
240 break;
241 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
242 ret = regmap_read(map, MAX17042_OCVInternal, &data);
243 if (ret < 0)
244 return ret;
245
246 val->intval = data * 625 / 8;
247 break;
248 case POWER_SUPPLY_PROP_CAPACITY:
249 ret = regmap_read(map, MAX17042_RepSOC, &data);
250 if (ret < 0)
251 return ret;
252
253 val->intval = data >> 8;
254 break;
255 case POWER_SUPPLY_PROP_CHARGE_FULL:
256 ret = regmap_read(map, MAX17042_FullCAP, &data);
257 if (ret < 0)
258 return ret;
259
260 val->intval = data * 1000 / 2;
261 break;
262 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
263 ret = regmap_read(map, MAX17042_QH, &data);
264 if (ret < 0)
265 return ret;
266
267 val->intval = data * 1000 / 2;
268 break;
269 case POWER_SUPPLY_PROP_TEMP:
270 ret = max17042_get_temperature(chip, &val->intval);
271 if (ret < 0)
272 return ret;
273 break;
274 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
275 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
276 if (ret < 0)
277 return ret;
278 /* LSB is Alert Minimum. In deci-centigrade */
279 val->intval = (data & 0xff) * 10;
280 break;
281 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
282 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
283 if (ret < 0)
284 return ret;
285 /* MSB is Alert Maximum. In deci-centigrade */
286 val->intval = (data >> 8) * 10;
287 break;
288 case POWER_SUPPLY_PROP_TEMP_MIN:
289 val->intval = chip->pdata->temp_min;
290 break;
291 case POWER_SUPPLY_PROP_TEMP_MAX:
292 val->intval = chip->pdata->temp_max;
293 break;
294 case POWER_SUPPLY_PROP_HEALTH:
295 ret = max17042_get_battery_health(chip, &val->intval);
296 if (ret < 0)
297 return ret;
298 break;
299 case POWER_SUPPLY_PROP_CURRENT_NOW:
300 if (chip->pdata->enable_current_sense) {
301 ret = regmap_read(map, MAX17042_Current, &data);
302 if (ret < 0)
303 return ret;
304
305 val->intval = data;
306 if (val->intval & 0x8000) {
307 /* Negative */
308 val->intval = ~val->intval & 0x7fff;
309 val->intval++;
310 val->intval *= -1;
311 }
312 val->intval *= 1562500 / chip->pdata->r_sns;
313 } else {
314 return -EINVAL;
315 }
316 break;
317 case POWER_SUPPLY_PROP_CURRENT_AVG:
318 if (chip->pdata->enable_current_sense) {
319 ret = regmap_read(map, MAX17042_AvgCurrent, &data);
320 if (ret < 0)
321 return ret;
322
323 val->intval = data;
324 if (val->intval & 0x8000) {
325 /* Negative */
326 val->intval = ~val->intval & 0x7fff;
327 val->intval++;
328 val->intval *= -1;
329 }
330 val->intval *= 1562500 / chip->pdata->r_sns;
331 } else {
332 return -EINVAL;
333 }
334 break;
335 default:
336 return -EINVAL;
337 }
338 return 0;
339 }
340
341 static int max17042_set_property(struct power_supply *psy,
342 enum power_supply_property psp,
343 const union power_supply_propval *val)
344 {
345 struct max17042_chip *chip = power_supply_get_drvdata(psy);
346 struct regmap *map = chip->regmap;
347 int ret = 0;
348 u32 data;
349 int8_t temp;
350
351 switch (psp) {
352 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
353 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
354 if (ret < 0)
355 return ret;
356
357 /* Input in deci-centigrade, convert to centigrade */
358 temp = val->intval / 10;
359 /* force min < max */
360 if (temp >= (int8_t)(data >> 8))
361 temp = (int8_t)(data >> 8) - 1;
362 /* Write both MAX and MIN ALERT */
363 data = (data & 0xff00) + temp;
364 ret = regmap_write(map, MAX17042_TALRT_Th, data);
365 break;
366 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
367 ret = regmap_read(map, MAX17042_TALRT_Th, &data);
368 if (ret < 0)
369 return ret;
370
371 /* Input in Deci-Centigrade, convert to centigrade */
372 temp = val->intval / 10;
373 /* force max > min */
374 if (temp <= (int8_t)(data & 0xff))
375 temp = (int8_t)(data & 0xff) + 1;
376 /* Write both MAX and MIN ALERT */
377 data = (data & 0xff) + (temp << 8);
378 ret = regmap_write(map, MAX17042_TALRT_Th, data);
379 break;
380 default:
381 ret = -EINVAL;
382 }
383
384 return ret;
385 }
386
387 static int max17042_property_is_writeable(struct power_supply *psy,
388 enum power_supply_property psp)
389 {
390 int ret;
391
392 switch (psp) {
393 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
394 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
395 ret = 1;
396 break;
397 default:
398 ret = 0;
399 }
400
401 return ret;
402 }
403
404 static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value)
405 {
406 int retries = 8;
407 int ret;
408 u32 read_value;
409
410 do {
411 ret = regmap_write(map, reg, value);
412 regmap_read(map, reg, &read_value);
413 if (read_value != value) {
414 ret = -EIO;
415 retries--;
416 }
417 } while (retries && read_value != value);
418
419 if (ret < 0)
420 pr_err("%s: err %d\n", __func__, ret);
421
422 return ret;
423 }
424
425 static inline void max17042_override_por(struct regmap *map,
426 u8 reg, u16 value)
427 {
428 if (value)
429 regmap_write(map, reg, value);
430 }
431
432 static inline void max10742_unlock_model(struct max17042_chip *chip)
433 {
434 struct regmap *map = chip->regmap;
435
436 regmap_write(map, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
437 regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
438 }
439
440 static inline void max10742_lock_model(struct max17042_chip *chip)
441 {
442 struct regmap *map = chip->regmap;
443
444 regmap_write(map, MAX17042_MLOCKReg1, MODEL_LOCK1);
445 regmap_write(map, MAX17042_MLOCKReg2, MODEL_LOCK2);
446 }
447
448 static inline void max17042_write_model_data(struct max17042_chip *chip,
449 u8 addr, int size)
450 {
451 struct regmap *map = chip->regmap;
452 int i;
453
454 for (i = 0; i < size; i++)
455 regmap_write(map, addr + i,
456 chip->pdata->config_data->cell_char_tbl[i]);
457 }
458
459 static inline void max17042_read_model_data(struct max17042_chip *chip,
460 u8 addr, u16 *data, int size)
461 {
462 struct regmap *map = chip->regmap;
463 int i;
464 u32 tmp;
465
466 for (i = 0; i < size; i++) {
467 regmap_read(map, addr + i, &tmp);
468 data[i] = (u16)tmp;
469 }
470 }
471
472 static inline int max17042_model_data_compare(struct max17042_chip *chip,
473 u16 *data1, u16 *data2, int size)
474 {
475 int i;
476
477 if (memcmp(data1, data2, size)) {
478 dev_err(&chip->client->dev, "%s compare failed\n", __func__);
479 for (i = 0; i < size; i++)
480 dev_info(&chip->client->dev, "0x%x, 0x%x",
481 data1[i], data2[i]);
482 dev_info(&chip->client->dev, "\n");
483 return -EINVAL;
484 }
485 return 0;
486 }
487
488 static int max17042_init_model(struct max17042_chip *chip)
489 {
490 int ret;
491 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
492 u16 *temp_data;
493
494 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
495 if (!temp_data)
496 return -ENOMEM;
497
498 max10742_unlock_model(chip);
499 max17042_write_model_data(chip, MAX17042_MODELChrTbl,
500 table_size);
501 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
502 table_size);
503
504 ret = max17042_model_data_compare(
505 chip,
506 chip->pdata->config_data->cell_char_tbl,
507 temp_data,
508 table_size);
509
510 max10742_lock_model(chip);
511 kfree(temp_data);
512
513 return ret;
514 }
515
516 static int max17042_verify_model_lock(struct max17042_chip *chip)
517 {
518 int i;
519 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
520 u16 *temp_data;
521 int ret = 0;
522
523 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
524 if (!temp_data)
525 return -ENOMEM;
526
527 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
528 table_size);
529 for (i = 0; i < table_size; i++)
530 if (temp_data[i])
531 ret = -EINVAL;
532
533 kfree(temp_data);
534 return ret;
535 }
536
537 static void max17042_write_config_regs(struct max17042_chip *chip)
538 {
539 struct max17042_config_data *config = chip->pdata->config_data;
540 struct regmap *map = chip->regmap;
541
542 regmap_write(map, MAX17042_CONFIG, config->config);
543 regmap_write(map, MAX17042_LearnCFG, config->learn_cfg);
544 regmap_write(map, MAX17042_FilterCFG,
545 config->filter_cfg);
546 regmap_write(map, MAX17042_RelaxCFG, config->relax_cfg);
547 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047 ||
548 chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)
549 regmap_write(map, MAX17047_FullSOCThr,
550 config->full_soc_thresh);
551 }
552
553 static void max17042_write_custom_regs(struct max17042_chip *chip)
554 {
555 struct max17042_config_data *config = chip->pdata->config_data;
556 struct regmap *map = chip->regmap;
557
558 max17042_write_verify_reg(map, MAX17042_RCOMP0, config->rcomp0);
559 max17042_write_verify_reg(map, MAX17042_TempCo, config->tcompc0);
560 max17042_write_verify_reg(map, MAX17042_ICHGTerm, config->ichgt_term);
561 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) {
562 regmap_write(map, MAX17042_EmptyTempCo, config->empty_tempco);
563 max17042_write_verify_reg(map, MAX17042_K_empty0,
564 config->kempty0);
565 } else {
566 max17042_write_verify_reg(map, MAX17047_QRTbl00,
567 config->qrtbl00);
568 max17042_write_verify_reg(map, MAX17047_QRTbl10,
569 config->qrtbl10);
570 max17042_write_verify_reg(map, MAX17047_QRTbl20,
571 config->qrtbl20);
572 max17042_write_verify_reg(map, MAX17047_QRTbl30,
573 config->qrtbl30);
574 }
575 }
576
577 static void max17042_update_capacity_regs(struct max17042_chip *chip)
578 {
579 struct max17042_config_data *config = chip->pdata->config_data;
580 struct regmap *map = chip->regmap;
581
582 max17042_write_verify_reg(map, MAX17042_FullCAP,
583 config->fullcap);
584 regmap_write(map, MAX17042_DesignCap, config->design_cap);
585 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
586 config->fullcapnom);
587 }
588
589 static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
590 {
591 unsigned int vfSoc;
592 struct regmap *map = chip->regmap;
593
594 regmap_read(map, MAX17042_VFSOC, &vfSoc);
595 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
596 max17042_write_verify_reg(map, MAX17042_VFSOC0, vfSoc);
597 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
598 }
599
600 static void max17042_load_new_capacity_params(struct max17042_chip *chip)
601 {
602 u32 full_cap0, rep_cap, dq_acc, vfSoc;
603 u32 rem_cap;
604
605 struct max17042_config_data *config = chip->pdata->config_data;
606 struct regmap *map = chip->regmap;
607
608 regmap_read(map, MAX17042_FullCAP0, &full_cap0);
609 regmap_read(map, MAX17042_VFSOC, &vfSoc);
610
611 /* fg_vfSoc needs to shifted by 8 bits to get the
612 * perc in 1% accuracy, to get the right rem_cap multiply
613 * full_cap0, fg_vfSoc and devide by 100
614 */
615 rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
616 max17042_write_verify_reg(map, MAX17042_RemCap, rem_cap);
617
618 rep_cap = rem_cap;
619 max17042_write_verify_reg(map, MAX17042_RepCap, rep_cap);
620
621 /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
622 dq_acc = config->fullcap / dQ_ACC_DIV;
623 max17042_write_verify_reg(map, MAX17042_dQacc, dq_acc);
624 max17042_write_verify_reg(map, MAX17042_dPacc, dP_ACC_200);
625
626 max17042_write_verify_reg(map, MAX17042_FullCAP,
627 config->fullcap);
628 regmap_write(map, MAX17042_DesignCap,
629 config->design_cap);
630 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
631 config->fullcapnom);
632 /* Update SOC register with new SOC */
633 regmap_write(map, MAX17042_RepSOC, vfSoc);
634 }
635
636 /*
637 * Block write all the override values coming from platform data.
638 * This function MUST be called before the POR initialization proceedure
639 * specified by maxim.
640 */
641 static inline void max17042_override_por_values(struct max17042_chip *chip)
642 {
643 struct regmap *map = chip->regmap;
644 struct max17042_config_data *config = chip->pdata->config_data;
645
646 max17042_override_por(map, MAX17042_TGAIN, config->tgain);
647 max17042_override_por(map, MAx17042_TOFF, config->toff);
648 max17042_override_por(map, MAX17042_CGAIN, config->cgain);
649 max17042_override_por(map, MAX17042_COFF, config->coff);
650
651 max17042_override_por(map, MAX17042_VALRT_Th, config->valrt_thresh);
652 max17042_override_por(map, MAX17042_TALRT_Th, config->talrt_thresh);
653 max17042_override_por(map, MAX17042_SALRT_Th,
654 config->soc_alrt_thresh);
655 max17042_override_por(map, MAX17042_CONFIG, config->config);
656 max17042_override_por(map, MAX17042_SHDNTIMER, config->shdntimer);
657
658 max17042_override_por(map, MAX17042_DesignCap, config->design_cap);
659 max17042_override_por(map, MAX17042_ICHGTerm, config->ichgt_term);
660
661 max17042_override_por(map, MAX17042_AtRate, config->at_rate);
662 max17042_override_por(map, MAX17042_LearnCFG, config->learn_cfg);
663 max17042_override_por(map, MAX17042_FilterCFG, config->filter_cfg);
664 max17042_override_por(map, MAX17042_RelaxCFG, config->relax_cfg);
665 max17042_override_por(map, MAX17042_MiscCFG, config->misc_cfg);
666 max17042_override_por(map, MAX17042_MaskSOC, config->masksoc);
667
668 max17042_override_por(map, MAX17042_FullCAP, config->fullcap);
669 max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom);
670 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
671 max17042_override_por(map, MAX17042_SOC_empty,
672 config->socempty);
673 max17042_override_por(map, MAX17042_LAvg_empty, config->lavg_empty);
674 max17042_override_por(map, MAX17042_dQacc, config->dqacc);
675 max17042_override_por(map, MAX17042_dPacc, config->dpacc);
676
677 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
678 max17042_override_por(map, MAX17042_V_empty, config->vempty);
679 else
680 max17042_override_por(map, MAX17047_V_empty, config->vempty);
681 max17042_override_por(map, MAX17042_TempNom, config->temp_nom);
682 max17042_override_por(map, MAX17042_TempLim, config->temp_lim);
683 max17042_override_por(map, MAX17042_FCTC, config->fctc);
684 max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0);
685 max17042_override_por(map, MAX17042_TempCo, config->tcompc0);
686 if (chip->chip_type) {
687 max17042_override_por(map, MAX17042_EmptyTempCo,
688 config->empty_tempco);
689 max17042_override_por(map, MAX17042_K_empty0,
690 config->kempty0);
691 }
692 }
693
694 static int max17042_init_chip(struct max17042_chip *chip)
695 {
696 struct regmap *map = chip->regmap;
697 int ret;
698
699 max17042_override_por_values(chip);
700 /* After Power up, the MAX17042 requires 500mS in order
701 * to perform signal debouncing and initial SOC reporting
702 */
703 msleep(500);
704
705 /* Initialize configaration */
706 max17042_write_config_regs(chip);
707
708 /* write cell characterization data */
709 ret = max17042_init_model(chip);
710 if (ret) {
711 dev_err(&chip->client->dev, "%s init failed\n",
712 __func__);
713 return -EIO;
714 }
715
716 ret = max17042_verify_model_lock(chip);
717 if (ret) {
718 dev_err(&chip->client->dev, "%s lock verify failed\n",
719 __func__);
720 return -EIO;
721 }
722 /* write custom parameters */
723 max17042_write_custom_regs(chip);
724
725 /* update capacity params */
726 max17042_update_capacity_regs(chip);
727
728 /* delay must be atleast 350mS to allow VFSOC
729 * to be calculated from the new configuration
730 */
731 msleep(350);
732
733 /* reset vfsoc0 reg */
734 max17042_reset_vfsoc0_reg(chip);
735
736 /* load new capacity params */
737 max17042_load_new_capacity_params(chip);
738
739 /* Init complete, Clear the POR bit */
740 regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0);
741 return 0;
742 }
743
744 static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
745 {
746 struct regmap *map = chip->regmap;
747 u32 soc, soc_tr;
748
749 /* program interrupt thesholds such that we should
750 * get interrupt for every 'off' perc change in the soc
751 */
752 regmap_read(map, MAX17042_RepSOC, &soc);
753 soc >>= 8;
754 soc_tr = (soc + off) << 8;
755 soc_tr |= (soc - off);
756 regmap_write(map, MAX17042_SALRT_Th, soc_tr);
757 }
758
759 static irqreturn_t max17042_thread_handler(int id, void *dev)
760 {
761 struct max17042_chip *chip = dev;
762 u32 val;
763
764 regmap_read(chip->regmap, MAX17042_STATUS, &val);
765 if ((val & STATUS_INTR_SOCMIN_BIT) ||
766 (val & STATUS_INTR_SOCMAX_BIT)) {
767 dev_info(&chip->client->dev, "SOC threshold INTR\n");
768 max17042_set_soc_threshold(chip, 1);
769 }
770
771 power_supply_changed(chip->battery);
772 return IRQ_HANDLED;
773 }
774
775 static void max17042_init_worker(struct work_struct *work)
776 {
777 struct max17042_chip *chip = container_of(work,
778 struct max17042_chip, work);
779 int ret;
780
781 /* Initialize registers according to values from the platform data */
782 if (chip->pdata->enable_por_init && chip->pdata->config_data) {
783 ret = max17042_init_chip(chip);
784 if (ret)
785 return;
786 }
787
788 chip->init_complete = 1;
789 }
790
791 #ifdef CONFIG_OF
792 static struct max17042_platform_data *
793 max17042_get_pdata(struct device *dev)
794 {
795 struct device_node *np = dev->of_node;
796 u32 prop;
797 struct max17042_platform_data *pdata;
798
799 if (!np)
800 return dev->platform_data;
801
802 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
803 if (!pdata)
804 return NULL;
805
806 /*
807 * Require current sense resistor value to be specified for
808 * current-sense functionality to be enabled at all.
809 */
810 if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
811 pdata->r_sns = prop;
812 pdata->enable_current_sense = true;
813 }
814
815 if (of_property_read_s32(np, "maxim,cold-temp", &pdata->temp_min))
816 pdata->temp_min = INT_MIN;
817 if (of_property_read_s32(np, "maxim,over-heat-temp", &pdata->temp_max))
818 pdata->temp_max = INT_MAX;
819 if (of_property_read_s32(np, "maxim,dead-volt", &pdata->vmin))
820 pdata->vmin = INT_MIN;
821 if (of_property_read_s32(np, "maxim,over-volt", &pdata->vmax))
822 pdata->vmax = INT_MAX;
823
824 return pdata;
825 }
826 #else
827 static struct max17042_platform_data *
828 max17042_get_pdata(struct device *dev)
829 {
830 return dev->platform_data;
831 }
832 #endif
833
834 static const struct regmap_config max17042_regmap_config = {
835 .reg_bits = 8,
836 .val_bits = 16,
837 .val_format_endian = REGMAP_ENDIAN_NATIVE,
838 };
839
840 static const struct power_supply_desc max17042_psy_desc = {
841 .name = "max170xx_battery",
842 .type = POWER_SUPPLY_TYPE_BATTERY,
843 .get_property = max17042_get_property,
844 .set_property = max17042_set_property,
845 .property_is_writeable = max17042_property_is_writeable,
846 .properties = max17042_battery_props,
847 .num_properties = ARRAY_SIZE(max17042_battery_props),
848 };
849
850 static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
851 .name = "max170xx_battery",
852 .type = POWER_SUPPLY_TYPE_BATTERY,
853 .get_property = max17042_get_property,
854 .set_property = max17042_set_property,
855 .property_is_writeable = max17042_property_is_writeable,
856 .properties = max17042_battery_props,
857 .num_properties = ARRAY_SIZE(max17042_battery_props) - 2,
858 };
859
860 static int max17042_probe(struct i2c_client *client,
861 const struct i2c_device_id *id)
862 {
863 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
864 const struct power_supply_desc *max17042_desc = &max17042_psy_desc;
865 struct power_supply_config psy_cfg = {};
866 struct max17042_chip *chip;
867 int ret;
868 int i;
869 u32 val;
870
871 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
872 return -EIO;
873
874 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
875 if (!chip)
876 return -ENOMEM;
877
878 chip->client = client;
879 chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config);
880 if (IS_ERR(chip->regmap)) {
881 dev_err(&client->dev, "Failed to initialize regmap\n");
882 return -EINVAL;
883 }
884
885 chip->pdata = max17042_get_pdata(&client->dev);
886 if (!chip->pdata) {
887 dev_err(&client->dev, "no platform data provided\n");
888 return -EINVAL;
889 }
890
891 i2c_set_clientdata(client, chip);
892 chip->chip_type = id->driver_data;
893 psy_cfg.drv_data = chip;
894
895 /* When current is not measured,
896 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
897 if (!chip->pdata->enable_current_sense)
898 max17042_desc = &max17042_no_current_sense_psy_desc;
899
900 if (chip->pdata->r_sns == 0)
901 chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
902
903 if (chip->pdata->init_data)
904 for (i = 0; i < chip->pdata->num_init_data; i++)
905 regmap_write(chip->regmap,
906 chip->pdata->init_data[i].addr,
907 chip->pdata->init_data[i].data);
908
909 if (!chip->pdata->enable_current_sense) {
910 regmap_write(chip->regmap, MAX17042_CGAIN, 0x0000);
911 regmap_write(chip->regmap, MAX17042_MiscCFG, 0x0003);
912 regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007);
913 }
914
915 chip->battery = devm_power_supply_register(&client->dev, max17042_desc,
916 &psy_cfg);
917 if (IS_ERR(chip->battery)) {
918 dev_err(&client->dev, "failed: power supply register\n");
919 return PTR_ERR(chip->battery);
920 }
921
922 if (client->irq) {
923 ret = devm_request_threaded_irq(&client->dev, client->irq,
924 NULL,
925 max17042_thread_handler,
926 IRQF_TRIGGER_FALLING |
927 IRQF_ONESHOT,
928 chip->battery->desc->name,
929 chip);
930 if (!ret) {
931 regmap_update_bits(chip->regmap, MAX17042_CONFIG,
932 CONFIG_ALRT_BIT_ENBL,
933 CONFIG_ALRT_BIT_ENBL);
934 max17042_set_soc_threshold(chip, 1);
935 } else {
936 client->irq = 0;
937 dev_err(&client->dev, "%s(): cannot get IRQ\n",
938 __func__);
939 }
940 }
941
942 regmap_read(chip->regmap, MAX17042_STATUS, &val);
943 if (val & STATUS_POR_BIT) {
944 INIT_WORK(&chip->work, max17042_init_worker);
945 schedule_work(&chip->work);
946 } else {
947 chip->init_complete = 1;
948 }
949
950 return 0;
951 }
952
953 #ifdef CONFIG_PM_SLEEP
954 static int max17042_suspend(struct device *dev)
955 {
956 struct max17042_chip *chip = dev_get_drvdata(dev);
957
958 /*
959 * disable the irq and enable irq_wake
960 * capability to the interrupt line.
961 */
962 if (chip->client->irq) {
963 disable_irq(chip->client->irq);
964 enable_irq_wake(chip->client->irq);
965 }
966
967 return 0;
968 }
969
970 static int max17042_resume(struct device *dev)
971 {
972 struct max17042_chip *chip = dev_get_drvdata(dev);
973
974 if (chip->client->irq) {
975 disable_irq_wake(chip->client->irq);
976 enable_irq(chip->client->irq);
977 /* re-program the SOC thresholds to 1% change */
978 max17042_set_soc_threshold(chip, 1);
979 }
980
981 return 0;
982 }
983 #endif
984
985 static SIMPLE_DEV_PM_OPS(max17042_pm_ops, max17042_suspend,
986 max17042_resume);
987
988 #ifdef CONFIG_OF
989 static const struct of_device_id max17042_dt_match[] = {
990 { .compatible = "maxim,max17042" },
991 { .compatible = "maxim,max17047" },
992 { .compatible = "maxim,max17050" },
993 { },
994 };
995 MODULE_DEVICE_TABLE(of, max17042_dt_match);
996 #endif
997
998 static const struct i2c_device_id max17042_id[] = {
999 { "max17042", MAXIM_DEVICE_TYPE_MAX17042 },
1000 { "max17047", MAXIM_DEVICE_TYPE_MAX17047 },
1001 { "max17050", MAXIM_DEVICE_TYPE_MAX17050 },
1002 { }
1003 };
1004 MODULE_DEVICE_TABLE(i2c, max17042_id);
1005
1006 static struct i2c_driver max17042_i2c_driver = {
1007 .driver = {
1008 .name = "max17042",
1009 .of_match_table = of_match_ptr(max17042_dt_match),
1010 .pm = &max17042_pm_ops,
1011 },
1012 .probe = max17042_probe,
1013 .id_table = max17042_id,
1014 };
1015 module_i2c_driver(max17042_i2c_driver);
1016
1017 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1018 MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
1019 MODULE_LICENSE("GPL");
Linux with added FPC-III support