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Linux 3.4-rc5
[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>
359ab9f5
MH		 31#include <linux/mod_devicetable.h>
32#include <linux/power_supply.h>
33#include <linux/power/max17042_battery.h>
3832246d 34#include <linux/of.h>
359ab9f5 35
f3a71a6e
RP		 36/* Status register bits */
37#define STATUS_POR_BIT (1 << 1)
38#define STATUS_BST_BIT (1 << 3)
39#define STATUS_VMN_BIT (1 << 8)
40#define STATUS_TMN_BIT (1 << 9)
41#define STATUS_SMN_BIT (1 << 10)
42#define STATUS_BI_BIT (1 << 11)
43#define STATUS_VMX_BIT (1 << 12)
44#define STATUS_TMX_BIT (1 << 13)
45#define STATUS_SMX_BIT (1 << 14)
46#define STATUS_BR_BIT (1 << 15)
47
e5f3872d
RP		 48/* Interrupt mask bits */
49#define CONFIG_ALRT_BIT_ENBL (1 << 2)
5cdd4d7f
RP		 50#define STATUS_INTR_SOCMIN_BIT (1 << 10)
51#define STATUS_INTR_SOCMAX_BIT (1 << 14)
e5f3872d 52
f3a71a6e
RP		 53#define VFSOC0_LOCK 0x0000
54#define VFSOC0_UNLOCK 0x0080
55#define MODEL_UNLOCK1 0X0059
56#define MODEL_UNLOCK2 0X00C4
57#define MODEL_LOCK1 0X0000
58#define MODEL_LOCK2 0X0000
59
60#define dQ_ACC_DIV 0x4
61#define dP_ACC_100 0x1900
62#define dP_ACC_200 0x3200
63
359ab9f5
MH		 64struct max17042_chip {
65 struct i2c_client *client;
66 struct power_supply battery;
67 struct max17042_platform_data *pdata;
f3a71a6e
RP		 68 struct work_struct work;
69 int init_complete;
359ab9f5
MH		 70};
71
72static int max17042_write_reg(struct i2c_client *client, u8 reg, u16 value)
73{
74 int ret = i2c_smbus_write_word_data(client, reg, value);
75
76 if (ret < 0)
77 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
78
79 return ret;
80}
81
82static int max17042_read_reg(struct i2c_client *client, u8 reg)
83{
84 int ret = i2c_smbus_read_word_data(client, reg);
85
86 if (ret < 0)
87 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
88
89 return ret;
90}
91
086ef502
DK		 92static void max17042_set_reg(struct i2c_client *client,
93 struct max17042_reg_data *data, int size)
94{
95 int i;
96
97 for (i = 0; i < size; i++)
98 max17042_write_reg(client, data[i].addr, data[i].data);
99}
100
359ab9f5 101static enum power_supply_property max17042_battery_props[] = {
086ef502
DK		 102 POWER_SUPPLY_PROP_PRESENT,
103 POWER_SUPPLY_PROP_CYCLE_COUNT,
104 POWER_SUPPLY_PROP_VOLTAGE_MAX,
105 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
359ab9f5
MH		 106 POWER_SUPPLY_PROP_VOLTAGE_NOW,
107 POWER_SUPPLY_PROP_VOLTAGE_AVG,
108 POWER_SUPPLY_PROP_CAPACITY,
086ef502
DK		 109 POWER_SUPPLY_PROP_CHARGE_FULL,
110 POWER_SUPPLY_PROP_TEMP,
111 POWER_SUPPLY_PROP_CURRENT_NOW,
112 POWER_SUPPLY_PROP_CURRENT_AVG,
359ab9f5
MH		 113};
114
115static int max17042_get_property(struct power_supply *psy,
116 enum power_supply_property psp,
117 union power_supply_propval *val)
118{
119 struct max17042_chip *chip = container_of(psy,
120 struct max17042_chip, battery);
60a1f6e4 121 int ret;
359ab9f5 122
f3a71a6e
RP		 123 if (!chip->init_complete)
124 return -EAGAIN;
125
359ab9f5 126 switch (psp) {
086ef502 127 case POWER_SUPPLY_PROP_PRESENT:
60a1f6e4
RP		 128 ret = max17042_read_reg(chip->client, MAX17042_STATUS);
129 if (ret < 0)
130 return ret;
131
132 if (ret & MAX17042_STATUS_BattAbsent)
086ef502
DK		 133 val->intval = 0;
134 else
135 val->intval = 1;
136 break;
137 case POWER_SUPPLY_PROP_CYCLE_COUNT:
60a1f6e4
RP		 138 ret = max17042_read_reg(chip->client, MAX17042_Cycles);
139 if (ret < 0)
140 return ret;
141
142 val->intval = ret;
086ef502
DK		 143 break;
144 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
60a1f6e4
RP		 145 ret = max17042_read_reg(chip->client, MAX17042_MinMaxVolt);
146 if (ret < 0)
147 return ret;
148
149 val->intval = ret >> 8;
086ef502
DK		 150 val->intval *= 20000; /* Units of LSB = 20mV */
151 break;
152 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
60a1f6e4
RP		 153 ret = max17042_read_reg(chip->client, MAX17042_V_empty);
154 if (ret < 0)
155 return ret;
156
157 val->intval = ret >> 7;
086ef502
DK		 158 val->intval *= 10000; /* Units of LSB = 10mV */
159 break;
359ab9f5 160 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
60a1f6e4
RP		 161 ret = max17042_read_reg(chip->client, MAX17042_VCELL);
162 if (ret < 0)
163 return ret;
164
165 val->intval = ret * 625 / 8;
359ab9f5
MH		 166 break;
167 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
60a1f6e4
RP		 168 ret = max17042_read_reg(chip->client, MAX17042_AvgVCELL);
169 if (ret < 0)
170 return ret;
171
172 val->intval = ret * 625 / 8;
359ab9f5
MH		 173 break;
174 case POWER_SUPPLY_PROP_CAPACITY:
13e0aa46 175 ret = max17042_read_reg(chip->client, MAX17042_RepSOC);
60a1f6e4
RP		 176 if (ret < 0)
177 return ret;
178
179 val->intval = ret >> 8;
359ab9f5 180 break;
086ef502 181 case POWER_SUPPLY_PROP_CHARGE_FULL:
6e0e60cd 182 ret = max17042_read_reg(chip->client, MAX17042_FullCAP);
60a1f6e4
RP		 183 if (ret < 0)
184 return ret;
185
6e0e60cd 186 val->intval = ret * 1000 / 2;
086ef502
DK		 187 break;
188 case POWER_SUPPLY_PROP_TEMP:
60a1f6e4
RP		 189 ret = max17042_read_reg(chip->client, MAX17042_TEMP);
190 if (ret < 0)
191 return ret;
192
193 val->intval = ret;
086ef502
DK		 194 /* The value is signed. */
195 if (val->intval & 0x8000) {
196 val->intval = (0x7fff & ~val->intval) + 1;
197 val->intval *= -1;
198 }
199 /* The value is converted into deci-centigrade scale */
200 /* Units of LSB = 1 / 256 degree Celsius */
201 val->intval = val->intval * 10 / 256;
202 break;
203 case POWER_SUPPLY_PROP_CURRENT_NOW:
204 if (chip->pdata->enable_current_sense) {
60a1f6e4
RP		 205 ret = max17042_read_reg(chip->client, MAX17042_Current);
206 if (ret < 0)
207 return ret;
208
209 val->intval = ret;
086ef502
DK		 210 if (val->intval & 0x8000) {
211 /* Negative */
212 val->intval = ~val->intval & 0x7fff;
213 val->intval++;
214 val->intval *= -1;
215 }
91d8b0d6 216 val->intval *= 1562500 / chip->pdata->r_sns;
086ef502
DK		 217 } else {
218 return -EINVAL;
219 }
220 break;
221 case POWER_SUPPLY_PROP_CURRENT_AVG:
222 if (chip->pdata->enable_current_sense) {
60a1f6e4
RP		 223 ret = max17042_read_reg(chip->client,
224 MAX17042_AvgCurrent);
225 if (ret < 0)
226 return ret;
227
228 val->intval = ret;
086ef502
DK		 229 if (val->intval & 0x8000) {
230 /* Negative */
231 val->intval = ~val->intval & 0x7fff;
232 val->intval++;
233 val->intval *= -1;
234 }
235 val->intval *= 1562500 / chip->pdata->r_sns;
236 } else {
237 return -EINVAL;
238 }
239 break;
359ab9f5
MH		 240 default:
241 return -EINVAL;
242 }
243 return 0;
244}
245
f3a71a6e
RP		 246static int max17042_write_verify_reg(struct i2c_client *client,
247 u8 reg, u16 value)
248{
249 int retries = 8;
250 int ret;
251 u16 read_value;
252
253 do {
254 ret = i2c_smbus_write_word_data(client, reg, value);
255 read_value = max17042_read_reg(client, reg);
256 if (read_value != value) {
257 ret = -EIO;
258 retries--;
259 }
260 } while (retries && read_value != value);
261
262 if (ret < 0)
263 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
264
265 return ret;
266}
267
268static inline void max17042_override_por(
269 struct i2c_client *client, u8 reg, u16 value)
270{
271 if (value)
272 max17042_write_reg(client, reg, value);
273}
274
275static inline void max10742_unlock_model(struct max17042_chip *chip)
276{
277 struct i2c_client *client = chip->client;
278 max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
279 max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
280}
281
282static inline void max10742_lock_model(struct max17042_chip *chip)
283{
284 struct i2c_client *client = chip->client;
285 max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_LOCK1);
286 max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_LOCK2);
287}
288
289static inline void max17042_write_model_data(struct max17042_chip *chip,
290 u8 addr, int size)
291{
292 struct i2c_client *client = chip->client;
293 int i;
294 for (i = 0; i < size; i++)
295 max17042_write_reg(client, addr + i,
296 chip->pdata->config_data->cell_char_tbl[i]);
297}
298
299static inline void max17042_read_model_data(struct max17042_chip *chip,
300 u8 addr, u16 *data, int size)
301{
302 struct i2c_client *client = chip->client;
303 int i;
304
305 for (i = 0; i < size; i++)
306 data[i] = max17042_read_reg(client, addr + i);
307}
308
309static inline int max17042_model_data_compare(struct max17042_chip *chip,
310 u16 *data1, u16 *data2, int size)
311{
312 int i;
313
314 if (memcmp(data1, data2, size)) {
315 dev_err(&chip->client->dev, "%s compare failed\n", __func__);
316 for (i = 0; i < size; i++)
317 dev_info(&chip->client->dev, "0x%x, 0x%x",
318 data1[i], data2[i]);
319 dev_info(&chip->client->dev, "\n");
320 return -EINVAL;
321 }
322 return 0;
323}
324
325static int max17042_init_model(struct max17042_chip *chip)
326{
327 int ret;
328 int table_size =
329 sizeof(chip->pdata->config_data->cell_char_tbl)/sizeof(u16);
330 u16 *temp_data;
331
332 temp_data = kzalloc(table_size, GFP_KERNEL);
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;
357 int table_size =
358 sizeof(chip->pdata->config_data->cell_char_tbl);
359 u16 *temp_data;
360 int ret = 0;
361
362 temp_data = kzalloc(table_size, GFP_KERNEL);
363 if (!temp_data)
364 return -ENOMEM;
365
366 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
367 table_size);
368 for (i = 0; i < table_size; i++)
369 if (temp_data[i])
370 ret = -EINVAL;
371
372 kfree(temp_data);
373 return ret;
374}
375
376static void max17042_write_config_regs(struct max17042_chip *chip)
377{
378 struct max17042_config_data *config = chip->pdata->config_data;
379
380 max17042_write_reg(chip->client, MAX17042_CONFIG, config->config);
381 max17042_write_reg(chip->client, MAX17042_LearnCFG, config->learn_cfg);
382 max17042_write_reg(chip->client, MAX17042_FilterCFG,
383 config->filter_cfg);
384 max17042_write_reg(chip->client, MAX17042_RelaxCFG, config->relax_cfg);
385}
386
387static void max17042_write_custom_regs(struct max17042_chip *chip)
388{
389 struct max17042_config_data *config = chip->pdata->config_data;
390
391 max17042_write_verify_reg(chip->client, MAX17042_RCOMP0,
392 config->rcomp0);
393 max17042_write_verify_reg(chip->client, MAX17042_TempCo,
394 config->tcompc0);
395 max17042_write_reg(chip->client, MAX17042_EmptyTempCo,
396 config->empty_tempco);
397 max17042_write_verify_reg(chip->client, MAX17042_K_empty0,
398 config->kempty0);
399 max17042_write_verify_reg(chip->client, MAX17042_ICHGTerm,
400 config->ichgt_term);
401}
402
403static void max17042_update_capacity_regs(struct max17042_chip *chip)
404{
405 struct max17042_config_data *config = chip->pdata->config_data;
406
407 max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
408 config->fullcap);
409 max17042_write_reg(chip->client, MAX17042_DesignCap,
410 config->design_cap);
411 max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
412 config->fullcapnom);
413}
414
415static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
416{
417 u16 vfSoc;
418
419 vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);
420 max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
421 max17042_write_verify_reg(chip->client, MAX17042_VFSOC0, vfSoc);
422 max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
423}
424
425static void max17042_load_new_capacity_params(struct max17042_chip *chip)
426{
427 u16 full_cap0, rep_cap, dq_acc, vfSoc;
428 u32 rem_cap;
429
430 struct max17042_config_data *config = chip->pdata->config_data;
431
432 full_cap0 = max17042_read_reg(chip->client, MAX17042_FullCAP0);
433 vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);
434
435 /* fg_vfSoc needs to shifted by 8 bits to get the
436 * perc in 1% accuracy, to get the right rem_cap multiply
437 * full_cap0, fg_vfSoc and devide by 100
438 */
439 rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
440 max17042_write_verify_reg(chip->client, MAX17042_RemCap, (u16)rem_cap);
441
442 rep_cap = (u16)rem_cap;
443 max17042_write_verify_reg(chip->client, MAX17042_RepCap, rep_cap);
444
445 /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
446 dq_acc = config->fullcap / dQ_ACC_DIV;
447 max17042_write_verify_reg(chip->client, MAX17042_dQacc, dq_acc);
448 max17042_write_verify_reg(chip->client, MAX17042_dPacc, dP_ACC_200);
449
450 max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
451 config->fullcap);
452 max17042_write_reg(chip->client, MAX17042_DesignCap,
453 config->design_cap);
454 max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
455 config->fullcapnom);
456}
457
458/*
459 * Block write all the override values coming from platform data.
460 * This function MUST be called before the POR initialization proceedure
461 * specified by maxim.
462 */
463static inline void max17042_override_por_values(struct max17042_chip *chip)
464{
465 struct i2c_client *client = chip->client;
466 struct max17042_config_data *config = chip->pdata->config_data;
467
468 max17042_override_por(client, MAX17042_TGAIN, config->tgain);
469 max17042_override_por(client, MAx17042_TOFF, config->toff);
470 max17042_override_por(client, MAX17042_CGAIN, config->cgain);
471 max17042_override_por(client, MAX17042_COFF, config->coff);
472
473 max17042_override_por(client, MAX17042_VALRT_Th, config->valrt_thresh);
474 max17042_override_por(client, MAX17042_TALRT_Th, config->talrt_thresh);
475 max17042_override_por(client, MAX17042_SALRT_Th,
476 config->soc_alrt_thresh);
477 max17042_override_por(client, MAX17042_CONFIG, config->config);
478 max17042_override_por(client, MAX17042_SHDNTIMER, config->shdntimer);
479
480 max17042_override_por(client, MAX17042_DesignCap, config->design_cap);
481 max17042_override_por(client, MAX17042_ICHGTerm, config->ichgt_term);
482
483 max17042_override_por(client, MAX17042_AtRate, config->at_rate);
484 max17042_override_por(client, MAX17042_LearnCFG, config->learn_cfg);
485 max17042_override_por(client, MAX17042_FilterCFG, config->filter_cfg);
486 max17042_override_por(client, MAX17042_RelaxCFG, config->relax_cfg);
487 max17042_override_por(client, MAX17042_MiscCFG, config->misc_cfg);
488 max17042_override_por(client, MAX17042_MaskSOC, config->masksoc);
489
490 max17042_override_por(client, MAX17042_FullCAP, config->fullcap);
491 max17042_override_por(client, MAX17042_FullCAPNom, config->fullcapnom);
492 max17042_override_por(client, MAX17042_SOC_empty, config->socempty);
493 max17042_override_por(client, MAX17042_LAvg_empty, config->lavg_empty);
494 max17042_override_por(client, MAX17042_dQacc, config->dqacc);
495 max17042_override_por(client, MAX17042_dPacc, config->dpacc);
496
497 max17042_override_por(client, MAX17042_V_empty, config->vempty);
498 max17042_override_por(client, MAX17042_TempNom, config->temp_nom);
499 max17042_override_por(client, MAX17042_TempLim, config->temp_lim);
500 max17042_override_por(client, MAX17042_FCTC, config->fctc);
501 max17042_override_por(client, MAX17042_RCOMP0, config->rcomp0);
502 max17042_override_por(client, MAX17042_TempCo, config->tcompc0);
503 max17042_override_por(client, MAX17042_EmptyTempCo,
504 config->empty_tempco);
505 max17042_override_por(client, MAX17042_K_empty0, config->kempty0);
506}
507
508static int max17042_init_chip(struct max17042_chip *chip)
509{
510 int ret;
511 int val;
512
513 max17042_override_por_values(chip);
514 /* After Power up, the MAX17042 requires 500mS in order
515 * to perform signal debouncing and initial SOC reporting
516 */
517 msleep(500);
518
519 /* Initialize configaration */
520 max17042_write_config_regs(chip);
521
522 /* write cell characterization data */
523 ret = max17042_init_model(chip);
524 if (ret) {
525 dev_err(&chip->client->dev, "%s init failed\n",
526 __func__);
527 return -EIO;
528 }
529 max17042_verify_model_lock(chip);
530 if (ret) {
531 dev_err(&chip->client->dev, "%s lock verify failed\n",
532 __func__);
533 return -EIO;
534 }
535 /* write custom parameters */
536 max17042_write_custom_regs(chip);
537
538 /* update capacity params */
539 max17042_update_capacity_regs(chip);
540
541 /* delay must be atleast 350mS to allow VFSOC
542 * to be calculated from the new configuration
543 */
544 msleep(350);
545
546 /* reset vfsoc0 reg */
547 max17042_reset_vfsoc0_reg(chip);
548
549 /* load new capacity params */
550 max17042_load_new_capacity_params(chip);
551
552 /* Init complete, Clear the POR bit */
553 val = max17042_read_reg(chip->client, MAX17042_STATUS);
554 max17042_write_reg(chip->client, MAX17042_STATUS,
555 val & (~STATUS_POR_BIT));
556 return 0;
557}
558
e5f3872d
RP		 559static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
560{
561 u16 soc, soc_tr;
562
563 /* program interrupt thesholds such that we should
564 * get interrupt for every 'off' perc change in the soc
565 */
566 soc = max17042_read_reg(chip->client, MAX17042_RepSOC) >> 8;
567 soc_tr = (soc + off) << 8;
568 soc_tr |= (soc - off);
569 max17042_write_reg(chip->client, MAX17042_SALRT_Th, soc_tr);
570}
571
e5f3872d
RP		 572static irqreturn_t max17042_thread_handler(int id, void *dev)
573{
574 struct max17042_chip *chip = dev;
575 u16 val;
576
577 val = max17042_read_reg(chip->client, MAX17042_STATUS);
5cdd4d7f
RP		 578 if ((val & STATUS_INTR_SOCMIN_BIT) ||
579 (val & STATUS_INTR_SOCMAX_BIT)) {
e5f3872d
RP		 580 dev_info(&chip->client->dev, "SOC threshold INTR\n");
581 max17042_set_soc_threshold(chip, 1);
582 }
583
584 power_supply_changed(&chip->battery);
585 return IRQ_HANDLED;
586}
f3a71a6e
RP		 587
588static void max17042_init_worker(struct work_struct *work)
589{
590 struct max17042_chip *chip = container_of(work,
591 struct max17042_chip, work);
592 int ret;
593
594 /* Initialize registers according to values from the platform data */
595 if (chip->pdata->enable_por_init && chip->pdata->config_data) {
596 ret = max17042_init_chip(chip);
597 if (ret)
598 return;
599 }
600
601 chip->init_complete = 1;
602}
603
3832246d
KL		 604#ifdef CONFIG_OF
605static struct max17042_platform_data *
606max17042_get_pdata(struct device *dev)
607{
608 struct device_node *np = dev->of_node;
609 u32 prop;
610 struct max17042_platform_data *pdata;
611
612 if (!np)
613 return dev->platform_data;
614
615 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
616 if (!pdata)
617 return NULL;
618
619 /*
620 * Require current sense resistor value to be specified for
621 * current-sense functionality to be enabled at all.
622 */
623 if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
624 pdata->r_sns = prop;
625 pdata->enable_current_sense = true;
626 }
627
628 return pdata;
629}
630#else
631static struct max17042_platform_data *
632max17042_get_pdata(struct device *dev)
633{
634 return dev->platform_data;
635}
636#endif
637
359ab9f5
MH		 638static int __devinit max17042_probe(struct i2c_client *client,
639 const struct i2c_device_id *id)
640{
641 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
642 struct max17042_chip *chip;
643 int ret;
f3a71a6e 644 int reg;
359ab9f5
MH		 645
646 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
647 return -EIO;
648
2f3b4342 649 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
359ab9f5
MH		 650 if (!chip)
651 return -ENOMEM;
652
653 chip->client = client;
3832246d
KL		 654 chip->pdata = max17042_get_pdata(&client->dev);
655 if (!chip->pdata) {
656 dev_err(&client->dev, "no platform data provided\n");
657 return -EINVAL;
658 }
359ab9f5
MH		 659
660 i2c_set_clientdata(client, chip);
661
662 chip->battery.name = "max17042_battery";
663 chip->battery.type = POWER_SUPPLY_TYPE_BATTERY;
664 chip->battery.get_property = max17042_get_property;
665 chip->battery.properties = max17042_battery_props;
666 chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props);
667
086ef502
DK		 668 /* When current is not measured,
669 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
670 if (!chip->pdata->enable_current_sense)
671 chip->battery.num_properties -= 2;
672
4cfa892c
PR		 673 if (chip->pdata->r_sns == 0)
674 chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
675
086ef502
DK		 676 if (chip->pdata->init_data)
677 max17042_set_reg(client, chip->pdata->init_data,
f3a71a6e 678 chip->pdata->num_init_data);
086ef502 679
359ab9f5
MH		 680 if (!chip->pdata->enable_current_sense) {
681 max17042_write_reg(client, MAX17042_CGAIN, 0x0000);
682 max17042_write_reg(client, MAX17042_MiscCFG, 0x0003);
683 max17042_write_reg(client, MAX17042_LearnCFG, 0x0007);
684 }
685
e5f3872d 686 if (client->irq) {
5cdd4d7f 687 ret = request_threaded_irq(client->irq, NULL,
e5f3872d 688 max17042_thread_handler,
5cdd4d7f
RP		 689 IRQF_TRIGGER_FALLING,
690 chip->battery.name, chip);
e5f3872d
RP		 691 if (!ret) {
692 reg = max17042_read_reg(client, MAX17042_CONFIG);
693 reg |= CONFIG_ALRT_BIT_ENBL;
694 max17042_write_reg(client, MAX17042_CONFIG, reg);
695 max17042_set_soc_threshold(chip, 1);
696 } else
697 dev_err(&client->dev, "%s(): cannot get IRQ\n",
698 __func__);
699 }
700
f3a71a6e
RP		 701 reg = max17042_read_reg(chip->client, MAX17042_STATUS);
702
703 if (reg & STATUS_POR_BIT) {
704 INIT_WORK(&chip->work, max17042_init_worker);
705 schedule_work(&chip->work);
706 } else {
707 chip->init_complete = 1;
708 }
709
710 ret = power_supply_register(&client->dev, &chip->battery);
2f3b4342 711 if (ret)
f3a71a6e 712 dev_err(&client->dev, "failed: power supply register\n");
f3a71a6e 713 return ret;
359ab9f5
MH		 714}
715
716static int __devexit max17042_remove(struct i2c_client *client)
717{
718 struct max17042_chip *chip = i2c_get_clientdata(client);
719
720 power_supply_unregister(&chip->battery);
359ab9f5
MH		 721 return 0;
722}
723
3832246d
KL		 724#ifdef CONFIG_OF
725static const struct of_device_id max17042_dt_match[] = {
726 { .compatible = "maxim,max17042" },
727 { },
728};
729MODULE_DEVICE_TABLE(of, max17042_dt_match);
730#endif
731
359ab9f5
MH		 732static const struct i2c_device_id max17042_id[] = {
733 { "max17042", 0 },
734 { }
735};
736MODULE_DEVICE_TABLE(i2c, max17042_id);
737
738static struct i2c_driver max17042_i2c_driver = {
739 .driver = {
740 .name = "max17042",
3832246d 741 .of_match_table = of_match_ptr(max17042_dt_match),
359ab9f5
MH		 742 },
743 .probe = max17042_probe,
744 .remove = __devexit_p(max17042_remove),
745 .id_table = max17042_id,
746};
5ff92e7a 747module_i2c_driver(max17042_i2c_driver);
359ab9f5
MH		 748
749MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
750MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
751MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)