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power_supply: Make the core a boolean instead of a tristate
[linux-2.6-block.git] / drivers / power / max17042_battery.c
CommitLineData
359ab9f5
MH		 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>
7e6d62db 26#include <linux/module.h>
359ab9f5
MH		 27#include <linux/slab.h>
28#include <linux/i2c.h>
f3a71a6e 29#include <linux/delay.h>
e5f3872d 30#include <linux/interrupt.h>
48bc1774 31#include <linux/pm.h>
359ab9f5
MH		 32#include <linux/mod_devicetable.h>
33#include <linux/power_supply.h>
34#include <linux/power/max17042_battery.h>
3832246d 35#include <linux/of.h>
359ab9f5 36
f3a71a6e
RP		 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
e5f3872d
RP		 49/* Interrupt mask bits */
50#define CONFIG_ALRT_BIT_ENBL (1 << 2)
5cdd4d7f
RP		 51#define STATUS_INTR_SOCMIN_BIT (1 << 10)
52#define STATUS_INTR_SOCMAX_BIT (1 << 14)
e5f3872d 53
f3a71a6e
RP		 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
359ab9f5
MH		 65struct max17042_chip {
66 struct i2c_client *client;
67 struct power_supply battery;
68 struct max17042_platform_data *pdata;
f3a71a6e
RP		 69 struct work_struct work;
70 int init_complete;
359ab9f5
MH		 71};
72
73static int max17042_write_reg(struct i2c_client *client, u8 reg, u16 value)
74{
75 int ret = i2c_smbus_write_word_data(client, reg, value);
76
77 if (ret < 0)
78 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
79
80 return ret;
81}
82
83static int max17042_read_reg(struct i2c_client *client, u8 reg)
84{
85 int ret = i2c_smbus_read_word_data(client, reg);
86
87 if (ret < 0)
88 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
89
90 return ret;
91}
92
086ef502
DK		 93static void max17042_set_reg(struct i2c_client *client,
94 struct max17042_reg_data *data, int size)
95{
96 int i;
97
98 for (i = 0; i < size; i++)
99 max17042_write_reg(client, data[i].addr, data[i].data);
100}
101
359ab9f5 102static enum power_supply_property max17042_battery_props[] = {
086ef502
DK		 103 POWER_SUPPLY_PROP_PRESENT,
104 POWER_SUPPLY_PROP_CYCLE_COUNT,
105 POWER_SUPPLY_PROP_VOLTAGE_MAX,
106 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
359ab9f5
MH		 107 POWER_SUPPLY_PROP_VOLTAGE_NOW,
108 POWER_SUPPLY_PROP_VOLTAGE_AVG,
a2ebfe2f 109 POWER_SUPPLY_PROP_VOLTAGE_OCV,
359ab9f5 110 POWER_SUPPLY_PROP_CAPACITY,
086ef502
DK		 111 POWER_SUPPLY_PROP_CHARGE_FULL,
112 POWER_SUPPLY_PROP_TEMP,
113 POWER_SUPPLY_PROP_CURRENT_NOW,
114 POWER_SUPPLY_PROP_CURRENT_AVG,
359ab9f5
MH		 115};
116
117static int max17042_get_property(struct power_supply *psy,
118 enum power_supply_property psp,
119 union power_supply_propval *val)
120{
121 struct max17042_chip *chip = container_of(psy,
122 struct max17042_chip, battery);
60a1f6e4 123 int ret;
359ab9f5 124
f3a71a6e
RP		 125 if (!chip->init_complete)
126 return -EAGAIN;
127
359ab9f5 128 switch (psp) {
086ef502 129 case POWER_SUPPLY_PROP_PRESENT:
60a1f6e4
RP		 130 ret = max17042_read_reg(chip->client, MAX17042_STATUS);
131 if (ret < 0)
132 return ret;
133
134 if (ret & MAX17042_STATUS_BattAbsent)
086ef502
DK		 135 val->intval = 0;
136 else
137 val->intval = 1;
138 break;
139 case POWER_SUPPLY_PROP_CYCLE_COUNT:
60a1f6e4
RP		 140 ret = max17042_read_reg(chip->client, MAX17042_Cycles);
141 if (ret < 0)
142 return ret;
143
144 val->intval = ret;
086ef502
DK		 145 break;
146 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
60a1f6e4
RP		 147 ret = max17042_read_reg(chip->client, MAX17042_MinMaxVolt);
148 if (ret < 0)
149 return ret;
150
151 val->intval = ret >> 8;
086ef502
DK		 152 val->intval *= 20000; /* Units of LSB = 20mV */
153 break;
154 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
60a1f6e4
RP		 155 ret = max17042_read_reg(chip->client, MAX17042_V_empty);
156 if (ret < 0)
157 return ret;
158
159 val->intval = ret >> 7;
086ef502
DK		 160 val->intval *= 10000; /* Units of LSB = 10mV */
161 break;
359ab9f5 162 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
60a1f6e4
RP		 163 ret = max17042_read_reg(chip->client, MAX17042_VCELL);
164 if (ret < 0)
165 return ret;
166
167 val->intval = ret * 625 / 8;
359ab9f5
MH		 168 break;
169 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
60a1f6e4
RP		 170 ret = max17042_read_reg(chip->client, MAX17042_AvgVCELL);
171 if (ret < 0)
172 return ret;
173
a2ebfe2f
RP		 174 val->intval = ret * 625 / 8;
175 break;
176 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
177 ret = max17042_read_reg(chip->client, MAX17042_OCVInternal);
178 if (ret < 0)
179 return ret;
180
60a1f6e4 181 val->intval = ret * 625 / 8;
359ab9f5
MH		 182 break;
183 case POWER_SUPPLY_PROP_CAPACITY:
13e0aa46 184 ret = max17042_read_reg(chip->client, MAX17042_RepSOC);
60a1f6e4
RP		 185 if (ret < 0)
186 return ret;
187
188 val->intval = ret >> 8;
359ab9f5 189 break;
086ef502 190 case POWER_SUPPLY_PROP_CHARGE_FULL:
6e0e60cd 191 ret = max17042_read_reg(chip->client, MAX17042_FullCAP);
60a1f6e4
RP		 192 if (ret < 0)
193 return ret;
194
6e0e60cd 195 val->intval = ret * 1000 / 2;
086ef502
DK		 196 break;
197 case POWER_SUPPLY_PROP_TEMP:
60a1f6e4
RP		 198 ret = max17042_read_reg(chip->client, MAX17042_TEMP);
199 if (ret < 0)
200 return ret;
201
202 val->intval = ret;
086ef502
DK		 203 /* The value is signed. */
204 if (val->intval & 0x8000) {
205 val->intval = (0x7fff & ~val->intval) + 1;
206 val->intval *= -1;
207 }
208 /* The value is converted into deci-centigrade scale */
209 /* Units of LSB = 1 / 256 degree Celsius */
210 val->intval = val->intval * 10 / 256;
211 break;
212 case POWER_SUPPLY_PROP_CURRENT_NOW:
213 if (chip->pdata->enable_current_sense) {
60a1f6e4
RP		 214 ret = max17042_read_reg(chip->client, MAX17042_Current);
215 if (ret < 0)
216 return ret;
217
218 val->intval = ret;
086ef502
DK		 219 if (val->intval & 0x8000) {
220 /* Negative */
221 val->intval = ~val->intval & 0x7fff;
222 val->intval++;
223 val->intval *= -1;
224 }
91d8b0d6 225 val->intval *= 1562500 / chip->pdata->r_sns;
086ef502
DK		 226 } else {
227 return -EINVAL;
228 }
229 break;
230 case POWER_SUPPLY_PROP_CURRENT_AVG:
231 if (chip->pdata->enable_current_sense) {
60a1f6e4
RP		 232 ret = max17042_read_reg(chip->client,
233 MAX17042_AvgCurrent);
234 if (ret < 0)
235 return ret;
236
237 val->intval = ret;
086ef502
DK		 238 if (val->intval & 0x8000) {
239 /* Negative */
240 val->intval = ~val->intval & 0x7fff;
241 val->intval++;
242 val->intval *= -1;
243 }
244 val->intval *= 1562500 / chip->pdata->r_sns;
245 } else {
246 return -EINVAL;
247 }
248 break;
359ab9f5
MH		 249 default:
250 return -EINVAL;
251 }
252 return 0;
253}
254
f3a71a6e
RP		 255static int max17042_write_verify_reg(struct i2c_client *client,
256 u8 reg, u16 value)
257{
258 int retries = 8;
259 int ret;
260 u16 read_value;
261
262 do {
263 ret = i2c_smbus_write_word_data(client, reg, value);
264 read_value = max17042_read_reg(client, reg);
265 if (read_value != value) {
266 ret = -EIO;
267 retries--;
268 }
269 } while (retries && read_value != value);
270
271 if (ret < 0)
272 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
273
274 return ret;
275}
276
277static inline void max17042_override_por(
278 struct i2c_client *client, u8 reg, u16 value)
279{
280 if (value)
281 max17042_write_reg(client, reg, value);
282}
283
284static inline void max10742_unlock_model(struct max17042_chip *chip)
285{
286 struct i2c_client *client = chip->client;
287 max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
288 max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
289}
290
291static inline void max10742_lock_model(struct max17042_chip *chip)
292{
293 struct i2c_client *client = chip->client;
294 max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_LOCK1);
295 max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_LOCK2);
296}
297
298static inline void max17042_write_model_data(struct max17042_chip *chip,
299 u8 addr, int size)
300{
301 struct i2c_client *client = chip->client;
302 int i;
303 for (i = 0; i < size; i++)
304 max17042_write_reg(client, addr + i,
305 chip->pdata->config_data->cell_char_tbl[i]);
306}
307
308static inline void max17042_read_model_data(struct max17042_chip *chip,
309 u8 addr, u16 *data, int size)
310{
311 struct i2c_client *client = chip->client;
312 int i;
313
314 for (i = 0; i < size; i++)
315 data[i] = max17042_read_reg(client, addr + i);
316}
317
318static inline int max17042_model_data_compare(struct max17042_chip *chip,
319 u16 *data1, u16 *data2, int size)
320{
321 int i;
322
323 if (memcmp(data1, data2, size)) {
324 dev_err(&chip->client->dev, "%s compare failed\n", __func__);
325 for (i = 0; i < size; i++)
326 dev_info(&chip->client->dev, "0x%x, 0x%x",
327 data1[i], data2[i]);
328 dev_info(&chip->client->dev, "\n");
329 return -EINVAL;
330 }
331 return 0;
332}
333
334static int max17042_init_model(struct max17042_chip *chip)
335{
336 int ret;
1ef3d8fb 337 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
f3a71a6e
RP		 338 u16 *temp_data;
339
1ef3d8fb 340 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
f3a71a6e
RP		 341 if (!temp_data)
342 return -ENOMEM;
343
344 max10742_unlock_model(chip);
345 max17042_write_model_data(chip, MAX17042_MODELChrTbl,
346 table_size);
347 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
348 table_size);
349
350 ret = max17042_model_data_compare(
351 chip,
352 chip->pdata->config_data->cell_char_tbl,
353 temp_data,
354 table_size);
355
356 max10742_lock_model(chip);
357 kfree(temp_data);
358
359 return ret;
360}
361
362static int max17042_verify_model_lock(struct max17042_chip *chip)
363{
364 int i;
1ef3d8fb 365 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
f3a71a6e
RP		 366 u16 *temp_data;
367 int ret = 0;
368
1ef3d8fb 369 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
f3a71a6e
RP		 370 if (!temp_data)
371 return -ENOMEM;
372
373 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
374 table_size);
375 for (i = 0; i < table_size; i++)
376 if (temp_data[i])
377 ret = -EINVAL;
378
379 kfree(temp_data);
380 return ret;
381}
382
383static void max17042_write_config_regs(struct max17042_chip *chip)
384{
385 struct max17042_config_data *config = chip->pdata->config_data;
386
387 max17042_write_reg(chip->client, MAX17042_CONFIG, config->config);
388 max17042_write_reg(chip->client, MAX17042_LearnCFG, config->learn_cfg);
389 max17042_write_reg(chip->client, MAX17042_FilterCFG,
390 config->filter_cfg);
391 max17042_write_reg(chip->client, MAX17042_RelaxCFG, config->relax_cfg);
392}
393
394static void max17042_write_custom_regs(struct max17042_chip *chip)
395{
396 struct max17042_config_data *config = chip->pdata->config_data;
397
398 max17042_write_verify_reg(chip->client, MAX17042_RCOMP0,
399 config->rcomp0);
400 max17042_write_verify_reg(chip->client, MAX17042_TempCo,
401 config->tcompc0);
402 max17042_write_reg(chip->client, MAX17042_EmptyTempCo,
403 config->empty_tempco);
404 max17042_write_verify_reg(chip->client, MAX17042_K_empty0,
405 config->kempty0);
406 max17042_write_verify_reg(chip->client, MAX17042_ICHGTerm,
407 config->ichgt_term);
408}
409
410static void max17042_update_capacity_regs(struct max17042_chip *chip)
411{
412 struct max17042_config_data *config = chip->pdata->config_data;
413
414 max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
415 config->fullcap);
416 max17042_write_reg(chip->client, MAX17042_DesignCap,
417 config->design_cap);
418 max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
419 config->fullcapnom);
420}
421
422static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
423{
424 u16 vfSoc;
425
426 vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);
427 max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
428 max17042_write_verify_reg(chip->client, MAX17042_VFSOC0, vfSoc);
429 max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
430}
431
432static void max17042_load_new_capacity_params(struct max17042_chip *chip)
433{
434 u16 full_cap0, rep_cap, dq_acc, vfSoc;
435 u32 rem_cap;
436
437 struct max17042_config_data *config = chip->pdata->config_data;
438
439 full_cap0 = max17042_read_reg(chip->client, MAX17042_FullCAP0);
440 vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);
441
442 /* fg_vfSoc needs to shifted by 8 bits to get the
443 * perc in 1% accuracy, to get the right rem_cap multiply
444 * full_cap0, fg_vfSoc and devide by 100
445 */
446 rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
447 max17042_write_verify_reg(chip->client, MAX17042_RemCap, (u16)rem_cap);
448
449 rep_cap = (u16)rem_cap;
450 max17042_write_verify_reg(chip->client, MAX17042_RepCap, rep_cap);
451
452 /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
453 dq_acc = config->fullcap / dQ_ACC_DIV;
454 max17042_write_verify_reg(chip->client, MAX17042_dQacc, dq_acc);
455 max17042_write_verify_reg(chip->client, MAX17042_dPacc, dP_ACC_200);
456
457 max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
458 config->fullcap);
459 max17042_write_reg(chip->client, MAX17042_DesignCap,
460 config->design_cap);
461 max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
462 config->fullcapnom);
463}
464
465/*
466 * Block write all the override values coming from platform data.
467 * This function MUST be called before the POR initialization proceedure
468 * specified by maxim.
469 */
470static inline void max17042_override_por_values(struct max17042_chip *chip)
471{
472 struct i2c_client *client = chip->client;
473 struct max17042_config_data *config = chip->pdata->config_data;
474
475 max17042_override_por(client, MAX17042_TGAIN, config->tgain);
476 max17042_override_por(client, MAx17042_TOFF, config->toff);
477 max17042_override_por(client, MAX17042_CGAIN, config->cgain);
478 max17042_override_por(client, MAX17042_COFF, config->coff);
479
480 max17042_override_por(client, MAX17042_VALRT_Th, config->valrt_thresh);
481 max17042_override_por(client, MAX17042_TALRT_Th, config->talrt_thresh);
482 max17042_override_por(client, MAX17042_SALRT_Th,
483 config->soc_alrt_thresh);
484 max17042_override_por(client, MAX17042_CONFIG, config->config);
485 max17042_override_por(client, MAX17042_SHDNTIMER, config->shdntimer);
486
487 max17042_override_por(client, MAX17042_DesignCap, config->design_cap);
488 max17042_override_por(client, MAX17042_ICHGTerm, config->ichgt_term);
489
490 max17042_override_por(client, MAX17042_AtRate, config->at_rate);
491 max17042_override_por(client, MAX17042_LearnCFG, config->learn_cfg);
492 max17042_override_por(client, MAX17042_FilterCFG, config->filter_cfg);
493 max17042_override_por(client, MAX17042_RelaxCFG, config->relax_cfg);
494 max17042_override_por(client, MAX17042_MiscCFG, config->misc_cfg);
495 max17042_override_por(client, MAX17042_MaskSOC, config->masksoc);
496
497 max17042_override_por(client, MAX17042_FullCAP, config->fullcap);
498 max17042_override_por(client, MAX17042_FullCAPNom, config->fullcapnom);
499 max17042_override_por(client, MAX17042_SOC_empty, config->socempty);
500 max17042_override_por(client, MAX17042_LAvg_empty, config->lavg_empty);
501 max17042_override_por(client, MAX17042_dQacc, config->dqacc);
502 max17042_override_por(client, MAX17042_dPacc, config->dpacc);
503
504 max17042_override_por(client, MAX17042_V_empty, config->vempty);
505 max17042_override_por(client, MAX17042_TempNom, config->temp_nom);
506 max17042_override_por(client, MAX17042_TempLim, config->temp_lim);
507 max17042_override_por(client, MAX17042_FCTC, config->fctc);
508 max17042_override_por(client, MAX17042_RCOMP0, config->rcomp0);
509 max17042_override_por(client, MAX17042_TempCo, config->tcompc0);
510 max17042_override_por(client, MAX17042_EmptyTempCo,
511 config->empty_tempco);
512 max17042_override_por(client, MAX17042_K_empty0, config->kempty0);
513}
514
515static int max17042_init_chip(struct max17042_chip *chip)
516{
517 int ret;
518 int val;
519
520 max17042_override_por_values(chip);
521 /* After Power up, the MAX17042 requires 500mS in order
522 * to perform signal debouncing and initial SOC reporting
523 */
524 msleep(500);
525
526 /* Initialize configaration */
527 max17042_write_config_regs(chip);
528
529 /* write cell characterization data */
530 ret = max17042_init_model(chip);
531 if (ret) {
532 dev_err(&chip->client->dev, "%s init failed\n",
533 __func__);
534 return -EIO;
535 }
536 max17042_verify_model_lock(chip);
537 if (ret) {
538 dev_err(&chip->client->dev, "%s lock verify failed\n",
539 __func__);
540 return -EIO;
541 }
542 /* write custom parameters */
543 max17042_write_custom_regs(chip);
544
545 /* update capacity params */
546 max17042_update_capacity_regs(chip);
547
548 /* delay must be atleast 350mS to allow VFSOC
549 * to be calculated from the new configuration
550 */
551 msleep(350);
552
553 /* reset vfsoc0 reg */
554 max17042_reset_vfsoc0_reg(chip);
555
556 /* load new capacity params */
557 max17042_load_new_capacity_params(chip);
558
559 /* Init complete, Clear the POR bit */
560 val = max17042_read_reg(chip->client, MAX17042_STATUS);
561 max17042_write_reg(chip->client, MAX17042_STATUS,
562 val & (~STATUS_POR_BIT));
563 return 0;
564}
565
e5f3872d
RP		 566static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
567{
568 u16 soc, soc_tr;
569
570 /* program interrupt thesholds such that we should
571 * get interrupt for every 'off' perc change in the soc
572 */
573 soc = max17042_read_reg(chip->client, MAX17042_RepSOC) >> 8;
574 soc_tr = (soc + off) << 8;
575 soc_tr |= (soc - off);
576 max17042_write_reg(chip->client, MAX17042_SALRT_Th, soc_tr);
577}
578
e5f3872d
RP		 579static irqreturn_t max17042_thread_handler(int id, void *dev)
580{
581 struct max17042_chip *chip = dev;
582 u16 val;
583
584 val = max17042_read_reg(chip->client, MAX17042_STATUS);
5cdd4d7f
RP		 585 if ((val & STATUS_INTR_SOCMIN_BIT) ||
586 (val & STATUS_INTR_SOCMAX_BIT)) {
e5f3872d
RP		 587 dev_info(&chip->client->dev, "SOC threshold INTR\n");
588 max17042_set_soc_threshold(chip, 1);
589 }
590
591 power_supply_changed(&chip->battery);
592 return IRQ_HANDLED;
593}
f3a71a6e
RP		 594
595static void max17042_init_worker(struct work_struct *work)
596{
597 struct max17042_chip *chip = container_of(work,
598 struct max17042_chip, work);
599 int ret;
600
601 /* Initialize registers according to values from the platform data */
602 if (chip->pdata->enable_por_init && chip->pdata->config_data) {
603 ret = max17042_init_chip(chip);
604 if (ret)
605 return;
606 }
607
608 chip->init_complete = 1;
609}
610
3832246d
KL		 611#ifdef CONFIG_OF
612static struct max17042_platform_data *
613max17042_get_pdata(struct device *dev)
614{
615 struct device_node *np = dev->of_node;
616 u32 prop;
617 struct max17042_platform_data *pdata;
618
619 if (!np)
620 return dev->platform_data;
621
622 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
623 if (!pdata)
624 return NULL;
625
626 /*
627 * Require current sense resistor value to be specified for
628 * current-sense functionality to be enabled at all.
629 */
630 if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
631 pdata->r_sns = prop;
632 pdata->enable_current_sense = true;
633 }
634
635 return pdata;
636}
637#else
638static struct max17042_platform_data *
639max17042_get_pdata(struct device *dev)
640{
641 return dev->platform_data;
642}
643#endif
644
359ab9f5
MH		 645static int __devinit max17042_probe(struct i2c_client *client,
646 const struct i2c_device_id *id)
647{
648 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
649 struct max17042_chip *chip;
650 int ret;
f3a71a6e 651 int reg;
359ab9f5
MH		 652
653 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
654 return -EIO;
655
2f3b4342 656 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
359ab9f5
MH		 657 if (!chip)
658 return -ENOMEM;
659
660 chip->client = client;
3832246d
KL		 661 chip->pdata = max17042_get_pdata(&client->dev);
662 if (!chip->pdata) {
663 dev_err(&client->dev, "no platform data provided\n");
664 return -EINVAL;
665 }
359ab9f5
MH		 666
667 i2c_set_clientdata(client, chip);
668
669 chip->battery.name = "max17042_battery";
670 chip->battery.type = POWER_SUPPLY_TYPE_BATTERY;
671 chip->battery.get_property = max17042_get_property;
672 chip->battery.properties = max17042_battery_props;
673 chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props);
674
086ef502
DK		 675 /* When current is not measured,
676 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
677 if (!chip->pdata->enable_current_sense)
678 chip->battery.num_properties -= 2;
679
4cfa892c
PR		 680 if (chip->pdata->r_sns == 0)
681 chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
682
086ef502
DK		 683 if (chip->pdata->init_data)
684 max17042_set_reg(client, chip->pdata->init_data,
f3a71a6e 685 chip->pdata->num_init_data);
086ef502 686
359ab9f5
MH		 687 if (!chip->pdata->enable_current_sense) {
688 max17042_write_reg(client, MAX17042_CGAIN, 0x0000);
689 max17042_write_reg(client, MAX17042_MiscCFG, 0x0003);
690 max17042_write_reg(client, MAX17042_LearnCFG, 0x0007);
691 }
692
e5f3872d 693 if (client->irq) {
5cdd4d7f 694 ret = request_threaded_irq(client->irq, NULL,
e5f3872d 695 max17042_thread_handler,
5cdd4d7f
RP		 696 IRQF_TRIGGER_FALLING,
697 chip->battery.name, chip);
e5f3872d
RP		 698 if (!ret) {
699 reg = max17042_read_reg(client, MAX17042_CONFIG);
700 reg |= CONFIG_ALRT_BIT_ENBL;
701 max17042_write_reg(client, MAX17042_CONFIG, reg);
702 max17042_set_soc_threshold(chip, 1);
703 } else
704 dev_err(&client->dev, "%s(): cannot get IRQ\n",
705 __func__);
706 }
707
f3a71a6e
RP		 708 reg = max17042_read_reg(chip->client, MAX17042_STATUS);
709
710 if (reg & STATUS_POR_BIT) {
711 INIT_WORK(&chip->work, max17042_init_worker);
712 schedule_work(&chip->work);
713 } else {
714 chip->init_complete = 1;
715 }
716
717 ret = power_supply_register(&client->dev, &chip->battery);
2f3b4342 718 if (ret)
f3a71a6e 719 dev_err(&client->dev, "failed: power supply register\n");
f3a71a6e 720 return ret;
359ab9f5
MH		 721}
722
723static int __devexit max17042_remove(struct i2c_client *client)
724{
725 struct max17042_chip *chip = i2c_get_clientdata(client);
726
bb28da90
RP		 727 if (client->irq)
728 free_irq(client->irq, chip);
359ab9f5 729 power_supply_unregister(&chip->battery);
359ab9f5
MH		 730 return 0;
731}
732
48bc1774
RP		 733#ifdef CONFIG_PM
734static int max17042_suspend(struct device *dev)
735{
736 struct max17042_chip *chip = dev_get_drvdata(dev);
737
48e41c70
AV		 738 /*
739 * disable the irq and enable irq_wake
48bc1774
RP		 740 * capability to the interrupt line.
741 */
742 if (chip->client->irq) {
743 disable_irq(chip->client->irq);
744 enable_irq_wake(chip->client->irq);
745 }
746
747 return 0;
748}
749
750static int max17042_resume(struct device *dev)
751{
752 struct max17042_chip *chip = dev_get_drvdata(dev);
753
754 if (chip->client->irq) {
755 disable_irq_wake(chip->client->irq);
756 enable_irq(chip->client->irq);
757 /* re-program the SOC thresholds to 1% change */
758 max17042_set_soc_threshold(chip, 1);
759 }
760
761 return 0;
762}
48e41c70
AV		 763
764static const struct dev_pm_ops max17042_pm_ops = {
765 .suspend = max17042_suspend,
766 .resume = max17042_resume,
767};
768
769#define MAX17042_PM_OPS (&max17042_pm_ops)
48bc1774 770#else
48e41c70 771#define MAX17042_PM_OPS NULL
48bc1774
RP		 772#endif
773
3832246d
KL		 774#ifdef CONFIG_OF
775static const struct of_device_id max17042_dt_match[] = {
776 { .compatible = "maxim,max17042" },
777 { },
778};
779MODULE_DEVICE_TABLE(of, max17042_dt_match);
780#endif
781
359ab9f5
MH		 782static const struct i2c_device_id max17042_id[] = {
783 { "max17042", 0 },
784 { }
785};
786MODULE_DEVICE_TABLE(i2c, max17042_id);
787
788static struct i2c_driver max17042_i2c_driver = {
789 .driver = {
790 .name = "max17042",
3832246d 791 .of_match_table = of_match_ptr(max17042_dt_match),
48e41c70 792 .pm = MAX17042_PM_OPS,
359ab9f5
MH		 793 },
794 .probe = max17042_probe,
795 .remove = __devexit_p(max17042_remove),
796 .id_table = max17042_id,
797};
5ff92e7a 798module_i2c_driver(max17042_i2c_driver);
359ab9f5
MH		 799
800MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
801MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
802MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)