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Merge branch 'fixes-omap4-dsp' into fixes-non-critical
[mirror_ubuntu-bionic-kernel.git] / drivers / power / max17042_battery.c
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
37 /* Status register bits */
38 #define STATUS_POR_BIT (1 << 1)
39 #define STATUS_BST_BIT (1 << 3)
40 #define STATUS_VMN_BIT (1 << 8)
41 #define STATUS_TMN_BIT (1 << 9)
42 #define STATUS_SMN_BIT (1 << 10)
43 #define STATUS_BI_BIT (1 << 11)
44 #define STATUS_VMX_BIT (1 << 12)
45 #define STATUS_TMX_BIT (1 << 13)
46 #define STATUS_SMX_BIT (1 << 14)
47 #define STATUS_BR_BIT (1 << 15)
48
49 /* Interrupt mask bits */
50 #define CONFIG_ALRT_BIT_ENBL (1 << 2)
51 #define STATUS_INTR_SOCMIN_BIT (1 << 10)
52 #define STATUS_INTR_SOCMAX_BIT (1 << 14)
53
54 #define VFSOC0_LOCK 0x0000
55 #define VFSOC0_UNLOCK 0x0080
56 #define MODEL_UNLOCK1 0X0059
57 #define MODEL_UNLOCK2 0X00C4
58 #define MODEL_LOCK1 0X0000
59 #define MODEL_LOCK2 0X0000
60
61 #define dQ_ACC_DIV 0x4
62 #define dP_ACC_100 0x1900
63 #define dP_ACC_200 0x3200
64
65 #define MAX17042_IC_VERSION 0x0092
66 #define MAX17047_IC_VERSION 0x00AC /* same for max17050 */
67
68 struct max17042_chip {
69 struct i2c_client *client;
70 struct power_supply battery;
71 enum max170xx_chip_type chip_type;
72 struct max17042_platform_data *pdata;
73 struct work_struct work;
74 int init_complete;
75 };
76
77 static int max17042_write_reg(struct i2c_client *client, u8 reg, u16 value)
78 {
79 int ret = i2c_smbus_write_word_data(client, reg, value);
80
81 if (ret < 0)
82 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
83
84 return ret;
85 }
86
87 static int max17042_read_reg(struct i2c_client *client, u8 reg)
88 {
89 int ret = i2c_smbus_read_word_data(client, reg);
90
91 if (ret < 0)
92 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
93
94 return ret;
95 }
96
97 static void max17042_set_reg(struct i2c_client *client,
98 struct max17042_reg_data *data, int size)
99 {
100 int i;
101
102 for (i = 0; i < size; i++)
103 max17042_write_reg(client, data[i].addr, data[i].data);
104 }
105
106 static enum power_supply_property max17042_battery_props[] = {
107 POWER_SUPPLY_PROP_PRESENT,
108 POWER_SUPPLY_PROP_CYCLE_COUNT,
109 POWER_SUPPLY_PROP_VOLTAGE_MAX,
110 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
111 POWER_SUPPLY_PROP_VOLTAGE_NOW,
112 POWER_SUPPLY_PROP_VOLTAGE_AVG,
113 POWER_SUPPLY_PROP_VOLTAGE_OCV,
114 POWER_SUPPLY_PROP_CAPACITY,
115 POWER_SUPPLY_PROP_CHARGE_FULL,
116 POWER_SUPPLY_PROP_TEMP,
117 POWER_SUPPLY_PROP_CURRENT_NOW,
118 POWER_SUPPLY_PROP_CURRENT_AVG,
119 };
120
121 static int max17042_get_property(struct power_supply *psy,
122 enum power_supply_property psp,
123 union power_supply_propval *val)
124 {
125 struct max17042_chip *chip = container_of(psy,
126 struct max17042_chip, battery);
127 int ret;
128
129 if (!chip->init_complete)
130 return -EAGAIN;
131
132 switch (psp) {
133 case POWER_SUPPLY_PROP_PRESENT:
134 ret = max17042_read_reg(chip->client, MAX17042_STATUS);
135 if (ret < 0)
136 return ret;
137
138 if (ret & MAX17042_STATUS_BattAbsent)
139 val->intval = 0;
140 else
141 val->intval = 1;
142 break;
143 case POWER_SUPPLY_PROP_CYCLE_COUNT:
144 ret = max17042_read_reg(chip->client, MAX17042_Cycles);
145 if (ret < 0)
146 return ret;
147
148 val->intval = ret;
149 break;
150 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
151 ret = max17042_read_reg(chip->client, MAX17042_MinMaxVolt);
152 if (ret < 0)
153 return ret;
154
155 val->intval = ret >> 8;
156 val->intval *= 20000; /* Units of LSB = 20mV */
157 break;
158 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
159 if (chip->chip_type == MAX17042)
160 ret = max17042_read_reg(chip->client, MAX17042_V_empty);
161 else
162 ret = max17042_read_reg(chip->client, MAX17047_V_empty);
163 if (ret < 0)
164 return ret;
165
166 val->intval = ret >> 7;
167 val->intval *= 10000; /* Units of LSB = 10mV */
168 break;
169 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
170 ret = max17042_read_reg(chip->client, MAX17042_VCELL);
171 if (ret < 0)
172 return ret;
173
174 val->intval = ret * 625 / 8;
175 break;
176 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
177 ret = max17042_read_reg(chip->client, MAX17042_AvgVCELL);
178 if (ret < 0)
179 return ret;
180
181 val->intval = ret * 625 / 8;
182 break;
183 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
184 ret = max17042_read_reg(chip->client, MAX17042_OCVInternal);
185 if (ret < 0)
186 return ret;
187
188 val->intval = ret * 625 / 8;
189 break;
190 case POWER_SUPPLY_PROP_CAPACITY:
191 ret = max17042_read_reg(chip->client, MAX17042_RepSOC);
192 if (ret < 0)
193 return ret;
194
195 val->intval = ret >> 8;
196 break;
197 case POWER_SUPPLY_PROP_CHARGE_FULL:
198 ret = max17042_read_reg(chip->client, MAX17042_FullCAP);
199 if (ret < 0)
200 return ret;
201
202 val->intval = ret * 1000 / 2;
203 break;
204 case POWER_SUPPLY_PROP_TEMP:
205 ret = max17042_read_reg(chip->client, MAX17042_TEMP);
206 if (ret < 0)
207 return ret;
208
209 val->intval = ret;
210 /* The value is signed. */
211 if (val->intval & 0x8000) {
212 val->intval = (0x7fff & ~val->intval) + 1;
213 val->intval *= -1;
214 }
215 /* The value is converted into deci-centigrade scale */
216 /* Units of LSB = 1 / 256 degree Celsius */
217 val->intval = val->intval * 10 / 256;
218 break;
219 case POWER_SUPPLY_PROP_CURRENT_NOW:
220 if (chip->pdata->enable_current_sense) {
221 ret = max17042_read_reg(chip->client, MAX17042_Current);
222 if (ret < 0)
223 return ret;
224
225 val->intval = ret;
226 if (val->intval & 0x8000) {
227 /* Negative */
228 val->intval = ~val->intval & 0x7fff;
229 val->intval++;
230 val->intval *= -1;
231 }
232 val->intval *= 1562500 / chip->pdata->r_sns;
233 } else {
234 return -EINVAL;
235 }
236 break;
237 case POWER_SUPPLY_PROP_CURRENT_AVG:
238 if (chip->pdata->enable_current_sense) {
239 ret = max17042_read_reg(chip->client,
240 MAX17042_AvgCurrent);
241 if (ret < 0)
242 return ret;
243
244 val->intval = ret;
245 if (val->intval & 0x8000) {
246 /* Negative */
247 val->intval = ~val->intval & 0x7fff;
248 val->intval++;
249 val->intval *= -1;
250 }
251 val->intval *= 1562500 / chip->pdata->r_sns;
252 } else {
253 return -EINVAL;
254 }
255 break;
256 default:
257 return -EINVAL;
258 }
259 return 0;
260 }
261
262 static int max17042_write_verify_reg(struct i2c_client *client,
263 u8 reg, u16 value)
264 {
265 int retries = 8;
266 int ret;
267 u16 read_value;
268
269 do {
270 ret = i2c_smbus_write_word_data(client, reg, value);
271 read_value = max17042_read_reg(client, reg);
272 if (read_value != value) {
273 ret = -EIO;
274 retries--;
275 }
276 } while (retries && read_value != value);
277
278 if (ret < 0)
279 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
280
281 return ret;
282 }
283
284 static inline void max17042_override_por(
285 struct i2c_client *client, u8 reg, u16 value)
286 {
287 if (value)
288 max17042_write_reg(client, reg, value);
289 }
290
291 static inline void max10742_unlock_model(struct max17042_chip *chip)
292 {
293 struct i2c_client *client = chip->client;
294 max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
295 max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
296 }
297
298 static inline void max10742_lock_model(struct max17042_chip *chip)
299 {
300 struct i2c_client *client = chip->client;
301 max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_LOCK1);
302 max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_LOCK2);
303 }
304
305 static inline void max17042_write_model_data(struct max17042_chip *chip,
306 u8 addr, int size)
307 {
308 struct i2c_client *client = chip->client;
309 int i;
310 for (i = 0; i < size; i++)
311 max17042_write_reg(client, addr + i,
312 chip->pdata->config_data->cell_char_tbl[i]);
313 }
314
315 static inline void max17042_read_model_data(struct max17042_chip *chip,
316 u8 addr, u16 *data, int size)
317 {
318 struct i2c_client *client = chip->client;
319 int i;
320
321 for (i = 0; i < size; i++)
322 data[i] = max17042_read_reg(client, addr + i);
323 }
324
325 static inline int max17042_model_data_compare(struct max17042_chip *chip,
326 u16 *data1, u16 *data2, int size)
327 {
328 int i;
329
330 if (memcmp(data1, data2, size)) {
331 dev_err(&chip->client->dev, "%s compare failed\n", __func__);
332 for (i = 0; i < size; i++)
333 dev_info(&chip->client->dev, "0x%x, 0x%x",
334 data1[i], data2[i]);
335 dev_info(&chip->client->dev, "\n");
336 return -EINVAL;
337 }
338 return 0;
339 }
340
341 static int max17042_init_model(struct max17042_chip *chip)
342 {
343 int ret;
344 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
345 u16 *temp_data;
346
347 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
348 if (!temp_data)
349 return -ENOMEM;
350
351 max10742_unlock_model(chip);
352 max17042_write_model_data(chip, MAX17042_MODELChrTbl,
353 table_size);
354 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
355 table_size);
356
357 ret = max17042_model_data_compare(
358 chip,
359 chip->pdata->config_data->cell_char_tbl,
360 temp_data,
361 table_size);
362
363 max10742_lock_model(chip);
364 kfree(temp_data);
365
366 return ret;
367 }
368
369 static int max17042_verify_model_lock(struct max17042_chip *chip)
370 {
371 int i;
372 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
373 u16 *temp_data;
374 int ret = 0;
375
376 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
377 if (!temp_data)
378 return -ENOMEM;
379
380 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
381 table_size);
382 for (i = 0; i < table_size; i++)
383 if (temp_data[i])
384 ret = -EINVAL;
385
386 kfree(temp_data);
387 return ret;
388 }
389
390 static void max17042_write_config_regs(struct max17042_chip *chip)
391 {
392 struct max17042_config_data *config = chip->pdata->config_data;
393
394 max17042_write_reg(chip->client, MAX17042_CONFIG, config->config);
395 max17042_write_reg(chip->client, MAX17042_LearnCFG, config->learn_cfg);
396 max17042_write_reg(chip->client, MAX17042_FilterCFG,
397 config->filter_cfg);
398 max17042_write_reg(chip->client, MAX17042_RelaxCFG, config->relax_cfg);
399 if (chip->chip_type == MAX17047)
400 max17042_write_reg(chip->client, MAX17047_FullSOCThr,
401 config->full_soc_thresh);
402 }
403
404 static void max17042_write_custom_regs(struct max17042_chip *chip)
405 {
406 struct max17042_config_data *config = chip->pdata->config_data;
407
408 max17042_write_verify_reg(chip->client, MAX17042_RCOMP0,
409 config->rcomp0);
410 max17042_write_verify_reg(chip->client, MAX17042_TempCo,
411 config->tcompc0);
412 max17042_write_verify_reg(chip->client, MAX17042_ICHGTerm,
413 config->ichgt_term);
414 if (chip->chip_type == MAX17042) {
415 max17042_write_reg(chip->client, MAX17042_EmptyTempCo,
416 config->empty_tempco);
417 max17042_write_verify_reg(chip->client, MAX17042_K_empty0,
418 config->kempty0);
419 } else {
420 max17042_write_verify_reg(chip->client, MAX17047_QRTbl00,
421 config->qrtbl00);
422 max17042_write_verify_reg(chip->client, MAX17047_QRTbl10,
423 config->qrtbl10);
424 max17042_write_verify_reg(chip->client, MAX17047_QRTbl20,
425 config->qrtbl20);
426 max17042_write_verify_reg(chip->client, MAX17047_QRTbl30,
427 config->qrtbl30);
428 }
429 }
430
431 static void max17042_update_capacity_regs(struct max17042_chip *chip)
432 {
433 struct max17042_config_data *config = chip->pdata->config_data;
434
435 max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
436 config->fullcap);
437 max17042_write_reg(chip->client, MAX17042_DesignCap,
438 config->design_cap);
439 max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
440 config->fullcapnom);
441 }
442
443 static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
444 {
445 u16 vfSoc;
446
447 vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);
448 max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
449 max17042_write_verify_reg(chip->client, MAX17042_VFSOC0, vfSoc);
450 max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
451 }
452
453 static void max17042_load_new_capacity_params(struct max17042_chip *chip)
454 {
455 u16 full_cap0, rep_cap, dq_acc, vfSoc;
456 u32 rem_cap;
457
458 struct max17042_config_data *config = chip->pdata->config_data;
459
460 full_cap0 = max17042_read_reg(chip->client, MAX17042_FullCAP0);
461 vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);
462
463 /* fg_vfSoc needs to shifted by 8 bits to get the
464 * perc in 1% accuracy, to get the right rem_cap multiply
465 * full_cap0, fg_vfSoc and devide by 100
466 */
467 rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
468 max17042_write_verify_reg(chip->client, MAX17042_RemCap, (u16)rem_cap);
469
470 rep_cap = (u16)rem_cap;
471 max17042_write_verify_reg(chip->client, MAX17042_RepCap, rep_cap);
472
473 /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
474 dq_acc = config->fullcap / dQ_ACC_DIV;
475 max17042_write_verify_reg(chip->client, MAX17042_dQacc, dq_acc);
476 max17042_write_verify_reg(chip->client, MAX17042_dPacc, dP_ACC_200);
477
478 max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
479 config->fullcap);
480 max17042_write_reg(chip->client, MAX17042_DesignCap,
481 config->design_cap);
482 max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
483 config->fullcapnom);
484 /* Update SOC register with new SOC */
485 max17042_write_reg(chip->client, MAX17042_RepSOC, vfSoc);
486 }
487
488 /*
489 * Block write all the override values coming from platform data.
490 * This function MUST be called before the POR initialization proceedure
491 * specified by maxim.
492 */
493 static inline void max17042_override_por_values(struct max17042_chip *chip)
494 {
495 struct i2c_client *client = chip->client;
496 struct max17042_config_data *config = chip->pdata->config_data;
497
498 max17042_override_por(client, MAX17042_TGAIN, config->tgain);
499 max17042_override_por(client, MAx17042_TOFF, config->toff);
500 max17042_override_por(client, MAX17042_CGAIN, config->cgain);
501 max17042_override_por(client, MAX17042_COFF, config->coff);
502
503 max17042_override_por(client, MAX17042_VALRT_Th, config->valrt_thresh);
504 max17042_override_por(client, MAX17042_TALRT_Th, config->talrt_thresh);
505 max17042_override_por(client, MAX17042_SALRT_Th,
506 config->soc_alrt_thresh);
507 max17042_override_por(client, MAX17042_CONFIG, config->config);
508 max17042_override_por(client, MAX17042_SHDNTIMER, config->shdntimer);
509
510 max17042_override_por(client, MAX17042_DesignCap, config->design_cap);
511 max17042_override_por(client, MAX17042_ICHGTerm, config->ichgt_term);
512
513 max17042_override_por(client, MAX17042_AtRate, config->at_rate);
514 max17042_override_por(client, MAX17042_LearnCFG, config->learn_cfg);
515 max17042_override_por(client, MAX17042_FilterCFG, config->filter_cfg);
516 max17042_override_por(client, MAX17042_RelaxCFG, config->relax_cfg);
517 max17042_override_por(client, MAX17042_MiscCFG, config->misc_cfg);
518 max17042_override_por(client, MAX17042_MaskSOC, config->masksoc);
519
520 max17042_override_por(client, MAX17042_FullCAP, config->fullcap);
521 max17042_override_por(client, MAX17042_FullCAPNom, config->fullcapnom);
522 if (chip->chip_type == MAX17042)
523 max17042_override_por(client, MAX17042_SOC_empty,
524 config->socempty);
525 max17042_override_por(client, MAX17042_LAvg_empty, config->lavg_empty);
526 max17042_override_por(client, MAX17042_dQacc, config->dqacc);
527 max17042_override_por(client, MAX17042_dPacc, config->dpacc);
528
529 if (chip->chip_type == MAX17042)
530 max17042_override_por(client, MAX17042_V_empty, config->vempty);
531 else
532 max17042_override_por(client, MAX17047_V_empty, config->vempty);
533 max17042_override_por(client, MAX17042_TempNom, config->temp_nom);
534 max17042_override_por(client, MAX17042_TempLim, config->temp_lim);
535 max17042_override_por(client, MAX17042_FCTC, config->fctc);
536 max17042_override_por(client, MAX17042_RCOMP0, config->rcomp0);
537 max17042_override_por(client, MAX17042_TempCo, config->tcompc0);
538 if (chip->chip_type) {
539 max17042_override_por(client, MAX17042_EmptyTempCo,
540 config->empty_tempco);
541 max17042_override_por(client, MAX17042_K_empty0,
542 config->kempty0);
543 }
544 }
545
546 static int max17042_init_chip(struct max17042_chip *chip)
547 {
548 int ret;
549 int val;
550
551 max17042_override_por_values(chip);
552 /* After Power up, the MAX17042 requires 500mS in order
553 * to perform signal debouncing and initial SOC reporting
554 */
555 msleep(500);
556
557 /* Initialize configaration */
558 max17042_write_config_regs(chip);
559
560 /* write cell characterization data */
561 ret = max17042_init_model(chip);
562 if (ret) {
563 dev_err(&chip->client->dev, "%s init failed\n",
564 __func__);
565 return -EIO;
566 }
567 max17042_verify_model_lock(chip);
568 if (ret) {
569 dev_err(&chip->client->dev, "%s lock verify failed\n",
570 __func__);
571 return -EIO;
572 }
573 /* write custom parameters */
574 max17042_write_custom_regs(chip);
575
576 /* update capacity params */
577 max17042_update_capacity_regs(chip);
578
579 /* delay must be atleast 350mS to allow VFSOC
580 * to be calculated from the new configuration
581 */
582 msleep(350);
583
584 /* reset vfsoc0 reg */
585 max17042_reset_vfsoc0_reg(chip);
586
587 /* load new capacity params */
588 max17042_load_new_capacity_params(chip);
589
590 /* Init complete, Clear the POR bit */
591 val = max17042_read_reg(chip->client, MAX17042_STATUS);
592 max17042_write_reg(chip->client, MAX17042_STATUS,
593 val & (~STATUS_POR_BIT));
594 return 0;
595 }
596
597 static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
598 {
599 u16 soc, soc_tr;
600
601 /* program interrupt thesholds such that we should
602 * get interrupt for every 'off' perc change in the soc
603 */
604 soc = max17042_read_reg(chip->client, MAX17042_RepSOC) >> 8;
605 soc_tr = (soc + off) << 8;
606 soc_tr |= (soc - off);
607 max17042_write_reg(chip->client, MAX17042_SALRT_Th, soc_tr);
608 }
609
610 static irqreturn_t max17042_thread_handler(int id, void *dev)
611 {
612 struct max17042_chip *chip = dev;
613 u16 val;
614
615 val = max17042_read_reg(chip->client, MAX17042_STATUS);
616 if ((val & STATUS_INTR_SOCMIN_BIT) ||
617 (val & STATUS_INTR_SOCMAX_BIT)) {
618 dev_info(&chip->client->dev, "SOC threshold INTR\n");
619 max17042_set_soc_threshold(chip, 1);
620 }
621
622 power_supply_changed(&chip->battery);
623 return IRQ_HANDLED;
624 }
625
626 static void max17042_init_worker(struct work_struct *work)
627 {
628 struct max17042_chip *chip = container_of(work,
629 struct max17042_chip, work);
630 int ret;
631
632 /* Initialize registers according to values from the platform data */
633 if (chip->pdata->enable_por_init && chip->pdata->config_data) {
634 ret = max17042_init_chip(chip);
635 if (ret)
636 return;
637 }
638
639 chip->init_complete = 1;
640 }
641
642 #ifdef CONFIG_OF
643 static struct max17042_platform_data *
644 max17042_get_pdata(struct device *dev)
645 {
646 struct device_node *np = dev->of_node;
647 u32 prop;
648 struct max17042_platform_data *pdata;
649
650 if (!np)
651 return dev->platform_data;
652
653 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
654 if (!pdata)
655 return NULL;
656
657 /*
658 * Require current sense resistor value to be specified for
659 * current-sense functionality to be enabled at all.
660 */
661 if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
662 pdata->r_sns = prop;
663 pdata->enable_current_sense = true;
664 }
665
666 return pdata;
667 }
668 #else
669 static struct max17042_platform_data *
670 max17042_get_pdata(struct device *dev)
671 {
672 return dev->platform_data;
673 }
674 #endif
675
676 static int __devinit max17042_probe(struct i2c_client *client,
677 const struct i2c_device_id *id)
678 {
679 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
680 struct max17042_chip *chip;
681 int ret;
682 int reg;
683
684 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
685 return -EIO;
686
687 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
688 if (!chip)
689 return -ENOMEM;
690
691 chip->client = client;
692 chip->pdata = max17042_get_pdata(&client->dev);
693 if (!chip->pdata) {
694 dev_err(&client->dev, "no platform data provided\n");
695 return -EINVAL;
696 }
697
698 i2c_set_clientdata(client, chip);
699
700 ret = max17042_read_reg(chip->client, MAX17042_DevName);
701 if (ret == MAX17042_IC_VERSION) {
702 dev_dbg(&client->dev, "chip type max17042 detected\n");
703 chip->chip_type = MAX17042;
704 } else if (ret == MAX17047_IC_VERSION) {
705 dev_dbg(&client->dev, "chip type max17047/50 detected\n");
706 chip->chip_type = MAX17047;
707 } else {
708 dev_err(&client->dev, "device version mismatch: %x\n", ret);
709 return -EIO;
710 }
711
712 chip->battery.name = "max170xx_battery";
713 chip->battery.type = POWER_SUPPLY_TYPE_BATTERY;
714 chip->battery.get_property = max17042_get_property;
715 chip->battery.properties = max17042_battery_props;
716 chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props);
717
718 /* When current is not measured,
719 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
720 if (!chip->pdata->enable_current_sense)
721 chip->battery.num_properties -= 2;
722
723 if (chip->pdata->r_sns == 0)
724 chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
725
726 if (chip->pdata->init_data)
727 max17042_set_reg(client, chip->pdata->init_data,
728 chip->pdata->num_init_data);
729
730 if (!chip->pdata->enable_current_sense) {
731 max17042_write_reg(client, MAX17042_CGAIN, 0x0000);
732 max17042_write_reg(client, MAX17042_MiscCFG, 0x0003);
733 max17042_write_reg(client, MAX17042_LearnCFG, 0x0007);
734 }
735
736 ret = power_supply_register(&client->dev, &chip->battery);
737 if (ret) {
738 dev_err(&client->dev, "failed: power supply register\n");
739 return ret;
740 }
741
742 if (client->irq) {
743 ret = request_threaded_irq(client->irq, NULL,
744 max17042_thread_handler,
745 IRQF_TRIGGER_FALLING,
746 chip->battery.name, chip);
747 if (!ret) {
748 reg = max17042_read_reg(client, MAX17042_CONFIG);
749 reg |= CONFIG_ALRT_BIT_ENBL;
750 max17042_write_reg(client, MAX17042_CONFIG, reg);
751 max17042_set_soc_threshold(chip, 1);
752 } else {
753 client->irq = 0;
754 dev_err(&client->dev, "%s(): cannot get IRQ\n",
755 __func__);
756 }
757 }
758
759 reg = max17042_read_reg(chip->client, MAX17042_STATUS);
760 if (reg & STATUS_POR_BIT) {
761 INIT_WORK(&chip->work, max17042_init_worker);
762 schedule_work(&chip->work);
763 } else {
764 chip->init_complete = 1;
765 }
766
767 return 0;
768 }
769
770 static int __devexit max17042_remove(struct i2c_client *client)
771 {
772 struct max17042_chip *chip = i2c_get_clientdata(client);
773
774 if (client->irq)
775 free_irq(client->irq, chip);
776 power_supply_unregister(&chip->battery);
777 return 0;
778 }
779
780 #ifdef CONFIG_PM
781 static int max17042_suspend(struct device *dev)
782 {
783 struct max17042_chip *chip = dev_get_drvdata(dev);
784
785 /*
786 * disable the irq and enable irq_wake
787 * capability to the interrupt line.
788 */
789 if (chip->client->irq) {
790 disable_irq(chip->client->irq);
791 enable_irq_wake(chip->client->irq);
792 }
793
794 return 0;
795 }
796
797 static int max17042_resume(struct device *dev)
798 {
799 struct max17042_chip *chip = dev_get_drvdata(dev);
800
801 if (chip->client->irq) {
802 disable_irq_wake(chip->client->irq);
803 enable_irq(chip->client->irq);
804 /* re-program the SOC thresholds to 1% change */
805 max17042_set_soc_threshold(chip, 1);
806 }
807
808 return 0;
809 }
810
811 static const struct dev_pm_ops max17042_pm_ops = {
812 .suspend = max17042_suspend,
813 .resume = max17042_resume,
814 };
815
816 #define MAX17042_PM_OPS (&max17042_pm_ops)
817 #else
818 #define MAX17042_PM_OPS NULL
819 #endif
820
821 #ifdef CONFIG_OF
822 static const struct of_device_id max17042_dt_match[] = {
823 { .compatible = "maxim,max17042" },
824 { .compatible = "maxim,max17047" },
825 { .compatible = "maxim,max17050" },
826 { },
827 };
828 MODULE_DEVICE_TABLE(of, max17042_dt_match);
829 #endif
830
831 static const struct i2c_device_id max17042_id[] = {
832 { "max17042", 0 },
833 { "max17047", 1 },
834 { "max17050", 2 },
835 { }
836 };
837 MODULE_DEVICE_TABLE(i2c, max17042_id);
838
839 static struct i2c_driver max17042_i2c_driver = {
840 .driver = {
841 .name = "max17042",
842 .of_match_table = of_match_ptr(max17042_dt_match),
843 .pm = MAX17042_PM_OPS,
844 },
845 .probe = max17042_probe,
846 .remove = __devexit_p(max17042_remove),
847 .id_table = max17042_id,
848 };
849 module_i2c_driver(max17042_i2c_driver);
850
851 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
852 MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
853 MODULE_LICENSE("GPL");
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