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max17042: Add support for signalling change in SOC
[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>
359ab9f5
MH		 31#include <linux/mod_devicetable.h>
32#include <linux/power_supply.h>
33#include <linux/power/max17042_battery.h>
34
f3a71a6e
RP		 35/* Status register bits */
36#define STATUS_POR_BIT (1 << 1)
37#define STATUS_BST_BIT (1 << 3)
38#define STATUS_VMN_BIT (1 << 8)
39#define STATUS_TMN_BIT (1 << 9)
40#define STATUS_SMN_BIT (1 << 10)
41#define STATUS_BI_BIT (1 << 11)
42#define STATUS_VMX_BIT (1 << 12)
43#define STATUS_TMX_BIT (1 << 13)
44#define STATUS_SMX_BIT (1 << 14)
45#define STATUS_BR_BIT (1 << 15)
46
e5f3872d
RP		 47/* Interrupt mask bits */
48#define CONFIG_ALRT_BIT_ENBL (1 << 2)
49#define STATUS_INTR_SOC_BIT (1 << 14)
50#define STATUS_INTR_LOW_SOC_BIT (1 << 10)
51
f3a71a6e
RP		 52#define VFSOC0_LOCK 0x0000
53#define VFSOC0_UNLOCK 0x0080
54#define MODEL_UNLOCK1 0X0059
55#define MODEL_UNLOCK2 0X00C4
56#define MODEL_LOCK1 0X0000
57#define MODEL_LOCK2 0X0000
58
59#define dQ_ACC_DIV 0x4
60#define dP_ACC_100 0x1900
61#define dP_ACC_200 0x3200
62
359ab9f5
MH		 63struct max17042_chip {
64 struct i2c_client *client;
65 struct power_supply battery;
66 struct max17042_platform_data *pdata;
f3a71a6e
RP		 67 struct work_struct work;
68 int init_complete;
359ab9f5
MH		 69};
70
71static int max17042_write_reg(struct i2c_client *client, u8 reg, u16 value)
72{
73 int ret = i2c_smbus_write_word_data(client, reg, value);
74
75 if (ret < 0)
76 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
77
78 return ret;
79}
80
81static int max17042_read_reg(struct i2c_client *client, u8 reg)
82{
83 int ret = i2c_smbus_read_word_data(client, reg);
84
85 if (ret < 0)
86 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
87
88 return ret;
89}
90
086ef502
DK		 91static void max17042_set_reg(struct i2c_client *client,
92 struct max17042_reg_data *data, int size)
93{
94 int i;
95
96 for (i = 0; i < size; i++)
97 max17042_write_reg(client, data[i].addr, data[i].data);
98}
99
359ab9f5 100static enum power_supply_property max17042_battery_props[] = {
086ef502
DK		 101 POWER_SUPPLY_PROP_PRESENT,
102 POWER_SUPPLY_PROP_CYCLE_COUNT,
103 POWER_SUPPLY_PROP_VOLTAGE_MAX,
104 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
359ab9f5
MH		 105 POWER_SUPPLY_PROP_VOLTAGE_NOW,
106 POWER_SUPPLY_PROP_VOLTAGE_AVG,
107 POWER_SUPPLY_PROP_CAPACITY,
086ef502
DK		 108 POWER_SUPPLY_PROP_CHARGE_FULL,
109 POWER_SUPPLY_PROP_TEMP,
110 POWER_SUPPLY_PROP_CURRENT_NOW,
111 POWER_SUPPLY_PROP_CURRENT_AVG,
359ab9f5
MH		 112};
113
114static int max17042_get_property(struct power_supply *psy,
115 enum power_supply_property psp,
116 union power_supply_propval *val)
117{
118 struct max17042_chip *chip = container_of(psy,
119 struct max17042_chip, battery);
60a1f6e4 120 int ret;
359ab9f5 121
f3a71a6e
RP		 122 if (!chip->init_complete)
123 return -EAGAIN;
124
359ab9f5 125 switch (psp) {
086ef502 126 case POWER_SUPPLY_PROP_PRESENT:
60a1f6e4
RP		 127 ret = max17042_read_reg(chip->client, MAX17042_STATUS);
128 if (ret < 0)
129 return ret;
130
131 if (ret & MAX17042_STATUS_BattAbsent)
086ef502
DK		 132 val->intval = 0;
133 else
134 val->intval = 1;
135 break;
136 case POWER_SUPPLY_PROP_CYCLE_COUNT:
60a1f6e4
RP		 137 ret = max17042_read_reg(chip->client, MAX17042_Cycles);
138 if (ret < 0)
139 return ret;
140
141 val->intval = ret;
086ef502
DK		 142 break;
143 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
60a1f6e4
RP		 144 ret = max17042_read_reg(chip->client, MAX17042_MinMaxVolt);
145 if (ret < 0)
146 return ret;
147
148 val->intval = ret >> 8;
086ef502
DK		 149 val->intval *= 20000; /* Units of LSB = 20mV */
150 break;
151 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
60a1f6e4
RP		 152 ret = max17042_read_reg(chip->client, MAX17042_V_empty);
153 if (ret < 0)
154 return ret;
155
156 val->intval = ret >> 7;
086ef502
DK		 157 val->intval *= 10000; /* Units of LSB = 10mV */
158 break;
359ab9f5 159 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
60a1f6e4
RP		 160 ret = max17042_read_reg(chip->client, MAX17042_VCELL);
161 if (ret < 0)
162 return ret;
163
164 val->intval = ret * 625 / 8;
359ab9f5
MH		 165 break;
166 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
60a1f6e4
RP		 167 ret = max17042_read_reg(chip->client, MAX17042_AvgVCELL);
168 if (ret < 0)
169 return ret;
170
171 val->intval = ret * 625 / 8;
359ab9f5
MH		 172 break;
173 case POWER_SUPPLY_PROP_CAPACITY:
60a1f6e4
RP		 174 ret = max17042_read_reg(chip->client, MAX17042_SOC);
175 if (ret < 0)
176 return ret;
177
178 val->intval = ret >> 8;
359ab9f5 179 break;
086ef502 180 case POWER_SUPPLY_PROP_CHARGE_FULL:
60a1f6e4
RP		 181 ret = max17042_read_reg(chip->client, MAX17042_RepSOC);
182 if (ret < 0)
183 return ret;
184
185 if ((ret >> 8) >= MAX17042_BATTERY_FULL)
086ef502 186 val->intval = 1;
60a1f6e4 187 else if (ret >= 0)
086ef502
DK		 188 val->intval = 0;
189 break;
190 case POWER_SUPPLY_PROP_TEMP:
60a1f6e4
RP		 191 ret = max17042_read_reg(chip->client, MAX17042_TEMP);
192 if (ret < 0)
193 return ret;
194
195 val->intval = ret;
086ef502
DK		 196 /* The value is signed. */
197 if (val->intval & 0x8000) {
198 val->intval = (0x7fff & ~val->intval) + 1;
199 val->intval *= -1;
200 }
201 /* The value is converted into deci-centigrade scale */
202 /* Units of LSB = 1 / 256 degree Celsius */
203 val->intval = val->intval * 10 / 256;
204 break;
205 case POWER_SUPPLY_PROP_CURRENT_NOW:
206 if (chip->pdata->enable_current_sense) {
60a1f6e4
RP		 207 ret = max17042_read_reg(chip->client, MAX17042_Current);
208 if (ret < 0)
209 return ret;
210
211 val->intval = ret;
086ef502
DK		 212 if (val->intval & 0x8000) {
213 /* Negative */
214 val->intval = ~val->intval & 0x7fff;
215 val->intval++;
216 val->intval *= -1;
217 }
91d8b0d6 218 val->intval *= 1562500 / chip->pdata->r_sns;
086ef502
DK		 219 } else {
220 return -EINVAL;
221 }
222 break;
223 case POWER_SUPPLY_PROP_CURRENT_AVG:
224 if (chip->pdata->enable_current_sense) {
60a1f6e4
RP		 225 ret = max17042_read_reg(chip->client,
226 MAX17042_AvgCurrent);
227 if (ret < 0)
228 return ret;
229
230 val->intval = ret;
086ef502
DK		 231 if (val->intval & 0x8000) {
232 /* Negative */
233 val->intval = ~val->intval & 0x7fff;
234 val->intval++;
235 val->intval *= -1;
236 }
237 val->intval *= 1562500 / chip->pdata->r_sns;
238 } else {
239 return -EINVAL;
240 }
241 break;
359ab9f5
MH		 242 default:
243 return -EINVAL;
244 }
245 return 0;
246}
247
f3a71a6e
RP		 248static int max17042_write_verify_reg(struct i2c_client *client,
249 u8 reg, u16 value)
250{
251 int retries = 8;
252 int ret;
253 u16 read_value;
254
255 do {
256 ret = i2c_smbus_write_word_data(client, reg, value);
257 read_value = max17042_read_reg(client, reg);
258 if (read_value != value) {
259 ret = -EIO;
260 retries--;
261 }
262 } while (retries && read_value != value);
263
264 if (ret < 0)
265 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
266
267 return ret;
268}
269
270static inline void max17042_override_por(
271 struct i2c_client *client, u8 reg, u16 value)
272{
273 if (value)
274 max17042_write_reg(client, reg, value);
275}
276
277static inline void max10742_unlock_model(struct max17042_chip *chip)
278{
279 struct i2c_client *client = chip->client;
280 max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
281 max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
282}
283
284static inline void max10742_lock_model(struct max17042_chip *chip)
285{
286 struct i2c_client *client = chip->client;
287 max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_LOCK1);
288 max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_LOCK2);
289}
290
291static inline void max17042_write_model_data(struct max17042_chip *chip,
292 u8 addr, int size)
293{
294 struct i2c_client *client = chip->client;
295 int i;
296 for (i = 0; i < size; i++)
297 max17042_write_reg(client, addr + i,
298 chip->pdata->config_data->cell_char_tbl[i]);
299}
300
301static inline void max17042_read_model_data(struct max17042_chip *chip,
302 u8 addr, u16 *data, int size)
303{
304 struct i2c_client *client = chip->client;
305 int i;
306
307 for (i = 0; i < size; i++)
308 data[i] = max17042_read_reg(client, addr + i);
309}
310
311static inline int max17042_model_data_compare(struct max17042_chip *chip,
312 u16 *data1, u16 *data2, int size)
313{
314 int i;
315
316 if (memcmp(data1, data2, size)) {
317 dev_err(&chip->client->dev, "%s compare failed\n", __func__);
318 for (i = 0; i < size; i++)
319 dev_info(&chip->client->dev, "0x%x, 0x%x",
320 data1[i], data2[i]);
321 dev_info(&chip->client->dev, "\n");
322 return -EINVAL;
323 }
324 return 0;
325}
326
327static int max17042_init_model(struct max17042_chip *chip)
328{
329 int ret;
330 int table_size =
331 sizeof(chip->pdata->config_data->cell_char_tbl)/sizeof(u16);
332 u16 *temp_data;
333
334 temp_data = kzalloc(table_size, GFP_KERNEL);
335 if (!temp_data)
336 return -ENOMEM;
337
338 max10742_unlock_model(chip);
339 max17042_write_model_data(chip, MAX17042_MODELChrTbl,
340 table_size);
341 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
342 table_size);
343
344 ret = max17042_model_data_compare(
345 chip,
346 chip->pdata->config_data->cell_char_tbl,
347 temp_data,
348 table_size);
349
350 max10742_lock_model(chip);
351 kfree(temp_data);
352
353 return ret;
354}
355
356static int max17042_verify_model_lock(struct max17042_chip *chip)
357{
358 int i;
359 int table_size =
360 sizeof(chip->pdata->config_data->cell_char_tbl);
361 u16 *temp_data;
362 int ret = 0;
363
364 temp_data = kzalloc(table_size, GFP_KERNEL);
365 if (!temp_data)
366 return -ENOMEM;
367
368 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
369 table_size);
370 for (i = 0; i < table_size; i++)
371 if (temp_data[i])
372 ret = -EINVAL;
373
374 kfree(temp_data);
375 return ret;
376}
377
378static void max17042_write_config_regs(struct max17042_chip *chip)
379{
380 struct max17042_config_data *config = chip->pdata->config_data;
381
382 max17042_write_reg(chip->client, MAX17042_CONFIG, config->config);
383 max17042_write_reg(chip->client, MAX17042_LearnCFG, config->learn_cfg);
384 max17042_write_reg(chip->client, MAX17042_FilterCFG,
385 config->filter_cfg);
386 max17042_write_reg(chip->client, MAX17042_RelaxCFG, config->relax_cfg);
387}
388
389static void max17042_write_custom_regs(struct max17042_chip *chip)
390{
391 struct max17042_config_data *config = chip->pdata->config_data;
392
393 max17042_write_verify_reg(chip->client, MAX17042_RCOMP0,
394 config->rcomp0);
395 max17042_write_verify_reg(chip->client, MAX17042_TempCo,
396 config->tcompc0);
397 max17042_write_reg(chip->client, MAX17042_EmptyTempCo,
398 config->empty_tempco);
399 max17042_write_verify_reg(chip->client, MAX17042_K_empty0,
400 config->kempty0);
401 max17042_write_verify_reg(chip->client, MAX17042_ICHGTerm,
402 config->ichgt_term);
403}
404
405static void max17042_update_capacity_regs(struct max17042_chip *chip)
406{
407 struct max17042_config_data *config = chip->pdata->config_data;
408
409 max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
410 config->fullcap);
411 max17042_write_reg(chip->client, MAX17042_DesignCap,
412 config->design_cap);
413 max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
414 config->fullcapnom);
415}
416
417static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
418{
419 u16 vfSoc;
420
421 vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);
422 max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
423 max17042_write_verify_reg(chip->client, MAX17042_VFSOC0, vfSoc);
424 max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
425}
426
427static void max17042_load_new_capacity_params(struct max17042_chip *chip)
428{
429 u16 full_cap0, rep_cap, dq_acc, vfSoc;
430 u32 rem_cap;
431
432 struct max17042_config_data *config = chip->pdata->config_data;
433
434 full_cap0 = max17042_read_reg(chip->client, MAX17042_FullCAP0);
435 vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);
436
437 /* fg_vfSoc needs to shifted by 8 bits to get the
438 * perc in 1% accuracy, to get the right rem_cap multiply
439 * full_cap0, fg_vfSoc and devide by 100
440 */
441 rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
442 max17042_write_verify_reg(chip->client, MAX17042_RemCap, (u16)rem_cap);
443
444 rep_cap = (u16)rem_cap;
445 max17042_write_verify_reg(chip->client, MAX17042_RepCap, rep_cap);
446
447 /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
448 dq_acc = config->fullcap / dQ_ACC_DIV;
449 max17042_write_verify_reg(chip->client, MAX17042_dQacc, dq_acc);
450 max17042_write_verify_reg(chip->client, MAX17042_dPacc, dP_ACC_200);
451
452 max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
453 config->fullcap);
454 max17042_write_reg(chip->client, MAX17042_DesignCap,
455 config->design_cap);
456 max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
457 config->fullcapnom);
458}
459
460/*
461 * Block write all the override values coming from platform data.
462 * This function MUST be called before the POR initialization proceedure
463 * specified by maxim.
464 */
465static inline void max17042_override_por_values(struct max17042_chip *chip)
466{
467 struct i2c_client *client = chip->client;
468 struct max17042_config_data *config = chip->pdata->config_data;
469
470 max17042_override_por(client, MAX17042_TGAIN, config->tgain);
471 max17042_override_por(client, MAx17042_TOFF, config->toff);
472 max17042_override_por(client, MAX17042_CGAIN, config->cgain);
473 max17042_override_por(client, MAX17042_COFF, config->coff);
474
475 max17042_override_por(client, MAX17042_VALRT_Th, config->valrt_thresh);
476 max17042_override_por(client, MAX17042_TALRT_Th, config->talrt_thresh);
477 max17042_override_por(client, MAX17042_SALRT_Th,
478 config->soc_alrt_thresh);
479 max17042_override_por(client, MAX17042_CONFIG, config->config);
480 max17042_override_por(client, MAX17042_SHDNTIMER, config->shdntimer);
481
482 max17042_override_por(client, MAX17042_DesignCap, config->design_cap);
483 max17042_override_por(client, MAX17042_ICHGTerm, config->ichgt_term);
484
485 max17042_override_por(client, MAX17042_AtRate, config->at_rate);
486 max17042_override_por(client, MAX17042_LearnCFG, config->learn_cfg);
487 max17042_override_por(client, MAX17042_FilterCFG, config->filter_cfg);
488 max17042_override_por(client, MAX17042_RelaxCFG, config->relax_cfg);
489 max17042_override_por(client, MAX17042_MiscCFG, config->misc_cfg);
490 max17042_override_por(client, MAX17042_MaskSOC, config->masksoc);
491
492 max17042_override_por(client, MAX17042_FullCAP, config->fullcap);
493 max17042_override_por(client, MAX17042_FullCAPNom, config->fullcapnom);
494 max17042_override_por(client, MAX17042_SOC_empty, config->socempty);
495 max17042_override_por(client, MAX17042_LAvg_empty, config->lavg_empty);
496 max17042_override_por(client, MAX17042_dQacc, config->dqacc);
497 max17042_override_por(client, MAX17042_dPacc, config->dpacc);
498
499 max17042_override_por(client, MAX17042_V_empty, config->vempty);
500 max17042_override_por(client, MAX17042_TempNom, config->temp_nom);
501 max17042_override_por(client, MAX17042_TempLim, config->temp_lim);
502 max17042_override_por(client, MAX17042_FCTC, config->fctc);
503 max17042_override_por(client, MAX17042_RCOMP0, config->rcomp0);
504 max17042_override_por(client, MAX17042_TempCo, config->tcompc0);
505 max17042_override_por(client, MAX17042_EmptyTempCo,
506 config->empty_tempco);
507 max17042_override_por(client, MAX17042_K_empty0, config->kempty0);
508}
509
510static int max17042_init_chip(struct max17042_chip *chip)
511{
512 int ret;
513 int val;
514
515 max17042_override_por_values(chip);
516 /* After Power up, the MAX17042 requires 500mS in order
517 * to perform signal debouncing and initial SOC reporting
518 */
519 msleep(500);
520
521 /* Initialize configaration */
522 max17042_write_config_regs(chip);
523
524 /* write cell characterization data */
525 ret = max17042_init_model(chip);
526 if (ret) {
527 dev_err(&chip->client->dev, "%s init failed\n",
528 __func__);
529 return -EIO;
530 }
531 max17042_verify_model_lock(chip);
532 if (ret) {
533 dev_err(&chip->client->dev, "%s lock verify failed\n",
534 __func__);
535 return -EIO;
536 }
537 /* write custom parameters */
538 max17042_write_custom_regs(chip);
539
540 /* update capacity params */
541 max17042_update_capacity_regs(chip);
542
543 /* delay must be atleast 350mS to allow VFSOC
544 * to be calculated from the new configuration
545 */
546 msleep(350);
547
548 /* reset vfsoc0 reg */
549 max17042_reset_vfsoc0_reg(chip);
550
551 /* load new capacity params */
552 max17042_load_new_capacity_params(chip);
553
554 /* Init complete, Clear the POR bit */
555 val = max17042_read_reg(chip->client, MAX17042_STATUS);
556 max17042_write_reg(chip->client, MAX17042_STATUS,
557 val & (~STATUS_POR_BIT));
558 return 0;
559}
560
e5f3872d
RP		 561static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
562{
563 u16 soc, soc_tr;
564
565 /* program interrupt thesholds such that we should
566 * get interrupt for every 'off' perc change in the soc
567 */
568 soc = max17042_read_reg(chip->client, MAX17042_RepSOC) >> 8;
569 soc_tr = (soc + off) << 8;
570 soc_tr |= (soc - off);
571 max17042_write_reg(chip->client, MAX17042_SALRT_Th, soc_tr);
572}
573
574static irqreturn_t max17042_intr_handler(int id, void *dev)
575{
576 return IRQ_WAKE_THREAD;
577}
578
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);
585 if ((val & STATUS_INTR_SOC_BIT) ||
586 (val & STATUS_INTR_LOW_SOC_BIT)) {
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
359ab9f5
MH		 611static int __devinit max17042_probe(struct i2c_client *client,
612 const struct i2c_device_id *id)
613{
614 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
615 struct max17042_chip *chip;
616 int ret;
f3a71a6e 617 int reg;
359ab9f5
MH		 618
619 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
620 return -EIO;
621
622 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
623 if (!chip)
624 return -ENOMEM;
625
626 chip->client = client;
627 chip->pdata = client->dev.platform_data;
628
629 i2c_set_clientdata(client, chip);
630
631 chip->battery.name = "max17042_battery";
632 chip->battery.type = POWER_SUPPLY_TYPE_BATTERY;
633 chip->battery.get_property = max17042_get_property;
634 chip->battery.properties = max17042_battery_props;
635 chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props);
636
086ef502
DK		 637 /* When current is not measured,
638 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
639 if (!chip->pdata->enable_current_sense)
640 chip->battery.num_properties -= 2;
641
4cfa892c
PR		 642 if (chip->pdata->r_sns == 0)
643 chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
644
086ef502
DK		 645 if (chip->pdata->init_data)
646 max17042_set_reg(client, chip->pdata->init_data,
f3a71a6e 647 chip->pdata->num_init_data);
086ef502 648
359ab9f5
MH		 649 if (!chip->pdata->enable_current_sense) {
650 max17042_write_reg(client, MAX17042_CGAIN, 0x0000);
651 max17042_write_reg(client, MAX17042_MiscCFG, 0x0003);
652 max17042_write_reg(client, MAX17042_LearnCFG, 0x0007);
653 }
654
e5f3872d
RP		 655 if (client->irq) {
656 ret = request_threaded_irq(client->irq, max17042_intr_handler,
657 max17042_thread_handler,
658 0, chip->battery.name, chip);
659 if (!ret) {
660 reg = max17042_read_reg(client, MAX17042_CONFIG);
661 reg |= CONFIG_ALRT_BIT_ENBL;
662 max17042_write_reg(client, MAX17042_CONFIG, reg);
663 max17042_set_soc_threshold(chip, 1);
664 } else
665 dev_err(&client->dev, "%s(): cannot get IRQ\n",
666 __func__);
667 }
668
f3a71a6e
RP		 669 reg = max17042_read_reg(chip->client, MAX17042_STATUS);
670
671 if (reg & STATUS_POR_BIT) {
672 INIT_WORK(&chip->work, max17042_init_worker);
673 schedule_work(&chip->work);
674 } else {
675 chip->init_complete = 1;
676 }
677
678 ret = power_supply_register(&client->dev, &chip->battery);
679 if (ret) {
680 dev_err(&client->dev, "failed: power supply register\n");
681 kfree(chip);
682 }
683 return ret;
359ab9f5
MH		 684}
685
686static int __devexit max17042_remove(struct i2c_client *client)
687{
688 struct max17042_chip *chip = i2c_get_clientdata(client);
689
690 power_supply_unregister(&chip->battery);
359ab9f5
MH		 691 kfree(chip);
692 return 0;
693}
694
695static const struct i2c_device_id max17042_id[] = {
696 { "max17042", 0 },
697 { }
698};
699MODULE_DEVICE_TABLE(i2c, max17042_id);
700
701static struct i2c_driver max17042_i2c_driver = {
702 .driver = {
703 .name = "max17042",
704 },
705 .probe = max17042_probe,
706 .remove = __devexit_p(max17042_remove),
707 .id_table = max17042_id,
708};
709
710static int __init max17042_init(void)
711{
712 return i2c_add_driver(&max17042_i2c_driver);
713}
714module_init(max17042_init);
715
716static void __exit max17042_exit(void)
717{
718 i2c_del_driver(&max17042_i2c_driver);
719}
720module_exit(max17042_exit);
721
722MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
723MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
724MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)