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