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usb: xhci: add USB2 Link power management BESL support
[linux/fpc-iii.git] / drivers / power / max17042_battery.c
blobd664ef58afa7d0ffd34d03e89444cd015f31ab7d
1 /*
2 * Fuel gauge driver for Maxim 17042 / 8966 / 8997
3 * Note that Maxim 8966 and 8997 are mfd and this is its subdevice.
4 *
5 * Copyright (C) 2011 Samsung Electronics
6 * MyungJoo Ham <myungjoo.ham@samsung.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * This driver is based on max17040_battery.c
23 */
24
25 #include <linux/init.h>
26 #include <linux/module.h>
27 #include <linux/slab.h>
28 #include <linux/i2c.h>
29 #include <linux/delay.h>
30 #include <linux/interrupt.h>
31 #include <linux/pm.h>
32 #include <linux/mod_devicetable.h>
33 #include <linux/power_supply.h>
34 #include <linux/power/max17042_battery.h>
35 #include <linux/of.h>
36
37 /* Status register bits */
38 #define STATUS_POR_BIT (1 << 1)
39 #define STATUS_BST_BIT (1 << 3)
40 #define STATUS_VMN_BIT (1 << 8)
41 #define STATUS_TMN_BIT (1 << 9)
42 #define STATUS_SMN_BIT (1 << 10)
43 #define STATUS_BI_BIT (1 << 11)
44 #define STATUS_VMX_BIT (1 << 12)
45 #define STATUS_TMX_BIT (1 << 13)
46 #define STATUS_SMX_BIT (1 << 14)
47 #define STATUS_BR_BIT (1 << 15)
48
49 /* Interrupt mask bits */
50 #define CONFIG_ALRT_BIT_ENBL (1 << 2)
51 #define STATUS_INTR_SOCMIN_BIT (1 << 10)
52 #define STATUS_INTR_SOCMAX_BIT (1 << 14)
53
54 #define VFSOC0_LOCK 0x0000
55 #define VFSOC0_UNLOCK 0x0080
56 #define MODEL_UNLOCK1 0X0059
57 #define MODEL_UNLOCK2 0X00C4
58 #define MODEL_LOCK1 0X0000
59 #define MODEL_LOCK2 0X0000
60
61 #define dQ_ACC_DIV 0x4
62 #define dP_ACC_100 0x1900
63 #define dP_ACC_200 0x3200
64
65 #define MAX17042_IC_VERSION 0x0092
66 #define MAX17047_IC_VERSION 0x00AC /* same for max17050 */
67
68 struct max17042_chip {
69 struct i2c_client *client;
70 struct power_supply battery;
71 enum max170xx_chip_type chip_type;
72 struct max17042_platform_data *pdata;
73 struct work_struct work;
74 int init_complete;
75 };
76
77 static int max17042_write_reg(struct i2c_client *client, u8 reg, u16 value)
78 {
79 int ret = i2c_smbus_write_word_data(client, reg, value);
80
81 if (ret < 0)
82 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
83
84 return ret;
85 }
86
87 static int max17042_read_reg(struct i2c_client *client, u8 reg)
88 {
89 int ret = i2c_smbus_read_word_data(client, reg);
90
91 if (ret < 0)
92 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
93
94 return ret;
95 }
96
97 static void max17042_set_reg(struct i2c_client *client,
98 struct max17042_reg_data *data, int size)
99 {
100 int i;
101
102 for (i = 0; i < size; i++)
103 max17042_write_reg(client, data[i].addr, data[i].data);
104 }
105
106 static enum power_supply_property max17042_battery_props[] = {
107 POWER_SUPPLY_PROP_PRESENT,
108 POWER_SUPPLY_PROP_CYCLE_COUNT,
109 POWER_SUPPLY_PROP_VOLTAGE_MAX,
110 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
111 POWER_SUPPLY_PROP_VOLTAGE_NOW,
112 POWER_SUPPLY_PROP_VOLTAGE_AVG,
113 POWER_SUPPLY_PROP_VOLTAGE_OCV,
114 POWER_SUPPLY_PROP_CAPACITY,
115 POWER_SUPPLY_PROP_CHARGE_FULL,
116 POWER_SUPPLY_PROP_CHARGE_COUNTER,
117 POWER_SUPPLY_PROP_TEMP,
118 POWER_SUPPLY_PROP_CURRENT_NOW,
119 POWER_SUPPLY_PROP_CURRENT_AVG,
120 };
121
122 static int max17042_get_property(struct power_supply *psy,
123 enum power_supply_property psp,
124 union power_supply_propval *val)
125 {
126 struct max17042_chip *chip = container_of(psy,
127 struct max17042_chip, battery);
128 int ret;
129
130 if (!chip->init_complete)
131 return -EAGAIN;
132
133 switch (psp) {
134 case POWER_SUPPLY_PROP_PRESENT:
135 ret = max17042_read_reg(chip->client, MAX17042_STATUS);
136 if (ret < 0)
137 return ret;
138
139 if (ret & MAX17042_STATUS_BattAbsent)
140 val->intval = 0;
141 else
142 val->intval = 1;
143 break;
144 case POWER_SUPPLY_PROP_CYCLE_COUNT:
145 ret = max17042_read_reg(chip->client, MAX17042_Cycles);
146 if (ret < 0)
147 return ret;
148
149 val->intval = ret;
150 break;
151 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
152 ret = max17042_read_reg(chip->client, MAX17042_MinMaxVolt);
153 if (ret < 0)
154 return ret;
155
156 val->intval = ret >> 8;
157 val->intval *= 20000; /* Units of LSB = 20mV */
158 break;
159 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
160 if (chip->chip_type == MAX17042)
161 ret = max17042_read_reg(chip->client, MAX17042_V_empty);
162 else
163 ret = max17042_read_reg(chip->client, MAX17047_V_empty);
164 if (ret < 0)
165 return ret;
166
167 val->intval = ret >> 7;
168 val->intval *= 10000; /* Units of LSB = 10mV */
169 break;
170 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
171 ret = max17042_read_reg(chip->client, MAX17042_VCELL);
172 if (ret < 0)
173 return ret;
174
175 val->intval = ret * 625 / 8;
176 break;
177 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
178 ret = max17042_read_reg(chip->client, MAX17042_AvgVCELL);
179 if (ret < 0)
180 return ret;
181
182 val->intval = ret * 625 / 8;
183 break;
184 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
185 ret = max17042_read_reg(chip->client, MAX17042_OCVInternal);
186 if (ret < 0)
187 return ret;
188
189 val->intval = ret * 625 / 8;
190 break;
191 case POWER_SUPPLY_PROP_CAPACITY:
192 ret = max17042_read_reg(chip->client, MAX17042_RepSOC);
193 if (ret < 0)
194 return ret;
195
196 val->intval = ret >> 8;
197 break;
198 case POWER_SUPPLY_PROP_CHARGE_FULL:
199 ret = max17042_read_reg(chip->client, MAX17042_FullCAP);
200 if (ret < 0)
201 return ret;
202
203 val->intval = ret * 1000 / 2;
204 break;
205 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
206 ret = max17042_read_reg(chip->client, MAX17042_QH);
207 if (ret < 0)
208 return ret;
209
210 val->intval = ret * 1000 / 2;
211 break;
212 case POWER_SUPPLY_PROP_TEMP:
213 ret = max17042_read_reg(chip->client, MAX17042_TEMP);
214 if (ret < 0)
215 return ret;
216
217 val->intval = ret;
218 /* The value is signed. */
219 if (val->intval & 0x8000) {
220 val->intval = (0x7fff & ~val->intval) + 1;
221 val->intval *= -1;
222 }
223 /* The value is converted into deci-centigrade scale */
224 /* Units of LSB = 1 / 256 degree Celsius */
225 val->intval = val->intval * 10 / 256;
226 break;
227 case POWER_SUPPLY_PROP_CURRENT_NOW:
228 if (chip->pdata->enable_current_sense) {
229 ret = max17042_read_reg(chip->client, MAX17042_Current);
230 if (ret < 0)
231 return ret;
232
233 val->intval = ret;
234 if (val->intval & 0x8000) {
235 /* Negative */
236 val->intval = ~val->intval & 0x7fff;
237 val->intval++;
238 val->intval *= -1;
239 }
240 val->intval *= 1562500 / chip->pdata->r_sns;
241 } else {
242 return -EINVAL;
243 }
244 break;
245 case POWER_SUPPLY_PROP_CURRENT_AVG:
246 if (chip->pdata->enable_current_sense) {
247 ret = max17042_read_reg(chip->client,
248 MAX17042_AvgCurrent);
249 if (ret < 0)
250 return ret;
251
252 val->intval = ret;
253 if (val->intval & 0x8000) {
254 /* Negative */
255 val->intval = ~val->intval & 0x7fff;
256 val->intval++;
257 val->intval *= -1;
258 }
259 val->intval *= 1562500 / chip->pdata->r_sns;
260 } else {
261 return -EINVAL;
262 }
263 break;
264 default:
265 return -EINVAL;
266 }
267 return 0;
268 }
269
270 static int max17042_write_verify_reg(struct i2c_client *client,
271 u8 reg, u16 value)
272 {
273 int retries = 8;
274 int ret;
275 u16 read_value;
276
277 do {
278 ret = i2c_smbus_write_word_data(client, reg, value);
279 read_value = max17042_read_reg(client, reg);
280 if (read_value != value) {
281 ret = -EIO;
282 retries--;
283 }
284 } while (retries && read_value != value);
285
286 if (ret < 0)
287 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
288
289 return ret;
290 }
291
292 static inline void max17042_override_por(
293 struct i2c_client *client, u8 reg, u16 value)
294 {
295 if (value)
296 max17042_write_reg(client, reg, value);
297 }
298
299 static inline void max10742_unlock_model(struct max17042_chip *chip)
300 {
301 struct i2c_client *client = chip->client;
302 max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
303 max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
304 }
305
306 static inline void max10742_lock_model(struct max17042_chip *chip)
307 {
308 struct i2c_client *client = chip->client;
309 max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_LOCK1);
310 max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_LOCK2);
311 }
312
313 static inline void max17042_write_model_data(struct max17042_chip *chip,
314 u8 addr, int size)
315 {
316 struct i2c_client *client = chip->client;
317 int i;
318 for (i = 0; i < size; i++)
319 max17042_write_reg(client, addr + i,
320 chip->pdata->config_data->cell_char_tbl[i]);
321 }
322
323 static inline void max17042_read_model_data(struct max17042_chip *chip,
324 u8 addr, u16 *data, int size)
325 {
326 struct i2c_client *client = chip->client;
327 int i;
328
329 for (i = 0; i < size; i++)
330 data[i] = max17042_read_reg(client, addr + i);
331 }
332
333 static inline int max17042_model_data_compare(struct max17042_chip *chip,
334 u16 *data1, u16 *data2, int size)
335 {
336 int i;
337
338 if (memcmp(data1, data2, size)) {
339 dev_err(&chip->client->dev, "%s compare failed\n", __func__);
340 for (i = 0; i < size; i++)
341 dev_info(&chip->client->dev, "0x%x, 0x%x",
342 data1[i], data2[i]);
343 dev_info(&chip->client->dev, "\n");
344 return -EINVAL;
345 }
346 return 0;
347 }
348
349 static int max17042_init_model(struct max17042_chip *chip)
350 {
351 int ret;
352 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
353 u16 *temp_data;
354
355 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
356 if (!temp_data)
357 return -ENOMEM;
358
359 max10742_unlock_model(chip);
360 max17042_write_model_data(chip, MAX17042_MODELChrTbl,
361 table_size);
362 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
363 table_size);
364
365 ret = max17042_model_data_compare(
366 chip,
367 chip->pdata->config_data->cell_char_tbl,
368 temp_data,
369 table_size);
370
371 max10742_lock_model(chip);
372 kfree(temp_data);
373
374 return ret;
375 }
376
377 static int max17042_verify_model_lock(struct max17042_chip *chip)
378 {
379 int i;
380 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
381 u16 *temp_data;
382 int ret = 0;
383
384 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
385 if (!temp_data)
386 return -ENOMEM;
387
388 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
389 table_size);
390 for (i = 0; i < table_size; i++)
391 if (temp_data[i])
392 ret = -EINVAL;
393
394 kfree(temp_data);
395 return ret;
396 }
397
398 static void max17042_write_config_regs(struct max17042_chip *chip)
399 {
400 struct max17042_config_data *config = chip->pdata->config_data;
401
402 max17042_write_reg(chip->client, MAX17042_CONFIG, config->config);
403 max17042_write_reg(chip->client, MAX17042_LearnCFG, config->learn_cfg);
404 max17042_write_reg(chip->client, MAX17042_FilterCFG,
405 config->filter_cfg);
406 max17042_write_reg(chip->client, MAX17042_RelaxCFG, config->relax_cfg);
407 if (chip->chip_type == MAX17047)
408 max17042_write_reg(chip->client, MAX17047_FullSOCThr,
409 config->full_soc_thresh);
410 }
411
412 static void max17042_write_custom_regs(struct max17042_chip *chip)
413 {
414 struct max17042_config_data *config = chip->pdata->config_data;
415
416 max17042_write_verify_reg(chip->client, MAX17042_RCOMP0,
417 config->rcomp0);
418 max17042_write_verify_reg(chip->client, MAX17042_TempCo,
419 config->tcompc0);
420 max17042_write_verify_reg(chip->client, MAX17042_ICHGTerm,
421 config->ichgt_term);
422 if (chip->chip_type == MAX17042) {
423 max17042_write_reg(chip->client, MAX17042_EmptyTempCo,
424 config->empty_tempco);
425 max17042_write_verify_reg(chip->client, MAX17042_K_empty0,
426 config->kempty0);
427 } else {
428 max17042_write_verify_reg(chip->client, MAX17047_QRTbl00,
429 config->qrtbl00);
430 max17042_write_verify_reg(chip->client, MAX17047_QRTbl10,
431 config->qrtbl10);
432 max17042_write_verify_reg(chip->client, MAX17047_QRTbl20,
433 config->qrtbl20);
434 max17042_write_verify_reg(chip->client, MAX17047_QRTbl30,
435 config->qrtbl30);
436 }
437 }
438
439 static void max17042_update_capacity_regs(struct max17042_chip *chip)
440 {
441 struct max17042_config_data *config = chip->pdata->config_data;
442
443 max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
444 config->fullcap);
445 max17042_write_reg(chip->client, MAX17042_DesignCap,
446 config->design_cap);
447 max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
448 config->fullcapnom);
449 }
450
451 static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
452 {
453 u16 vfSoc;
454
455 vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);
456 max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
457 max17042_write_verify_reg(chip->client, MAX17042_VFSOC0, vfSoc);
458 max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
459 }
460
461 static void max17042_load_new_capacity_params(struct max17042_chip *chip)
462 {
463 u16 full_cap0, rep_cap, dq_acc, vfSoc;
464 u32 rem_cap;
465
466 struct max17042_config_data *config = chip->pdata->config_data;
467
468 full_cap0 = max17042_read_reg(chip->client, MAX17042_FullCAP0);
469 vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC);
470
471 /* fg_vfSoc needs to shifted by 8 bits to get the
472 * perc in 1% accuracy, to get the right rem_cap multiply
473 * full_cap0, fg_vfSoc and devide by 100
474 */
475 rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
476 max17042_write_verify_reg(chip->client, MAX17042_RemCap, (u16)rem_cap);
477
478 rep_cap = (u16)rem_cap;
479 max17042_write_verify_reg(chip->client, MAX17042_RepCap, rep_cap);
480
481 /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
482 dq_acc = config->fullcap / dQ_ACC_DIV;
483 max17042_write_verify_reg(chip->client, MAX17042_dQacc, dq_acc);
484 max17042_write_verify_reg(chip->client, MAX17042_dPacc, dP_ACC_200);
485
486 max17042_write_verify_reg(chip->client, MAX17042_FullCAP,
487 config->fullcap);
488 max17042_write_reg(chip->client, MAX17042_DesignCap,
489 config->design_cap);
490 max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom,
491 config->fullcapnom);
492 /* Update SOC register with new SOC */
493 max17042_write_reg(chip->client, MAX17042_RepSOC, vfSoc);
494 }
495
496 /*
497 * Block write all the override values coming from platform data.
498 * This function MUST be called before the POR initialization proceedure
499 * specified by maxim.
500 */
501 static inline void max17042_override_por_values(struct max17042_chip *chip)
502 {
503 struct i2c_client *client = chip->client;
504 struct max17042_config_data *config = chip->pdata->config_data;
505
506 max17042_override_por(client, MAX17042_TGAIN, config->tgain);
507 max17042_override_por(client, MAx17042_TOFF, config->toff);
508 max17042_override_por(client, MAX17042_CGAIN, config->cgain);
509 max17042_override_por(client, MAX17042_COFF, config->coff);
510
511 max17042_override_por(client, MAX17042_VALRT_Th, config->valrt_thresh);
512 max17042_override_por(client, MAX17042_TALRT_Th, config->talrt_thresh);
513 max17042_override_por(client, MAX17042_SALRT_Th,
514 config->soc_alrt_thresh);
515 max17042_override_por(client, MAX17042_CONFIG, config->config);
516 max17042_override_por(client, MAX17042_SHDNTIMER, config->shdntimer);
517
518 max17042_override_por(client, MAX17042_DesignCap, config->design_cap);
519 max17042_override_por(client, MAX17042_ICHGTerm, config->ichgt_term);
520
521 max17042_override_por(client, MAX17042_AtRate, config->at_rate);
522 max17042_override_por(client, MAX17042_LearnCFG, config->learn_cfg);
523 max17042_override_por(client, MAX17042_FilterCFG, config->filter_cfg);
524 max17042_override_por(client, MAX17042_RelaxCFG, config->relax_cfg);
525 max17042_override_por(client, MAX17042_MiscCFG, config->misc_cfg);
526 max17042_override_por(client, MAX17042_MaskSOC, config->masksoc);
527
528 max17042_override_por(client, MAX17042_FullCAP, config->fullcap);
529 max17042_override_por(client, MAX17042_FullCAPNom, config->fullcapnom);
530 if (chip->chip_type == MAX17042)
531 max17042_override_por(client, MAX17042_SOC_empty,
532 config->socempty);
533 max17042_override_por(client, MAX17042_LAvg_empty, config->lavg_empty);
534 max17042_override_por(client, MAX17042_dQacc, config->dqacc);
535 max17042_override_por(client, MAX17042_dPacc, config->dpacc);
536
537 if (chip->chip_type == MAX17042)
538 max17042_override_por(client, MAX17042_V_empty, config->vempty);
539 else
540 max17042_override_por(client, MAX17047_V_empty, config->vempty);
541 max17042_override_por(client, MAX17042_TempNom, config->temp_nom);
542 max17042_override_por(client, MAX17042_TempLim, config->temp_lim);
543 max17042_override_por(client, MAX17042_FCTC, config->fctc);
544 max17042_override_por(client, MAX17042_RCOMP0, config->rcomp0);
545 max17042_override_por(client, MAX17042_TempCo, config->tcompc0);
546 if (chip->chip_type) {
547 max17042_override_por(client, MAX17042_EmptyTempCo,
548 config->empty_tempco);
549 max17042_override_por(client, MAX17042_K_empty0,
550 config->kempty0);
551 }
552 }
553
554 static int max17042_init_chip(struct max17042_chip *chip)
555 {
556 int ret;
557 int val;
558
559 max17042_override_por_values(chip);
560 /* After Power up, the MAX17042 requires 500mS in order
561 * to perform signal debouncing and initial SOC reporting
562 */
563 msleep(500);
564
565 /* Initialize configaration */
566 max17042_write_config_regs(chip);
567
568 /* write cell characterization data */
569 ret = max17042_init_model(chip);
570 if (ret) {
571 dev_err(&chip->client->dev, "%s init failed\n",
572 __func__);
573 return -EIO;
574 }
575
576 ret = max17042_verify_model_lock(chip);
577 if (ret) {
578 dev_err(&chip->client->dev, "%s lock verify failed\n",
579 __func__);
580 return -EIO;
581 }
582 /* write custom parameters */
583 max17042_write_custom_regs(chip);
584
585 /* update capacity params */
586 max17042_update_capacity_regs(chip);
587
588 /* delay must be atleast 350mS to allow VFSOC
589 * to be calculated from the new configuration
590 */
591 msleep(350);
592
593 /* reset vfsoc0 reg */
594 max17042_reset_vfsoc0_reg(chip);
595
596 /* load new capacity params */
597 max17042_load_new_capacity_params(chip);
598
599 /* Init complete, Clear the POR bit */
600 val = max17042_read_reg(chip->client, MAX17042_STATUS);
601 max17042_write_reg(chip->client, MAX17042_STATUS,
602 val & (~STATUS_POR_BIT));
603 return 0;
604 }
605
606 static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
607 {
608 u16 soc, soc_tr;
609
610 /* program interrupt thesholds such that we should
611 * get interrupt for every 'off' perc change in the soc
612 */
613 soc = max17042_read_reg(chip->client, MAX17042_RepSOC) >> 8;
614 soc_tr = (soc + off) << 8;
615 soc_tr |= (soc - off);
616 max17042_write_reg(chip->client, MAX17042_SALRT_Th, soc_tr);
617 }
618
619 static irqreturn_t max17042_thread_handler(int id, void *dev)
620 {
621 struct max17042_chip *chip = dev;
622 u16 val;
623
624 val = max17042_read_reg(chip->client, MAX17042_STATUS);
625 if ((val & STATUS_INTR_SOCMIN_BIT) ||
626 (val & STATUS_INTR_SOCMAX_BIT)) {
627 dev_info(&chip->client->dev, "SOC threshold INTR\n");
628 max17042_set_soc_threshold(chip, 1);
629 }
630
631 power_supply_changed(&chip->battery);
632 return IRQ_HANDLED;
633 }
634
635 static void max17042_init_worker(struct work_struct *work)
636 {
637 struct max17042_chip *chip = container_of(work,
638 struct max17042_chip, work);
639 int ret;
640
641 /* Initialize registers according to values from the platform data */
642 if (chip->pdata->enable_por_init && chip->pdata->config_data) {
643 ret = max17042_init_chip(chip);
644 if (ret)
645 return;
646 }
647
648 chip->init_complete = 1;
649 }
650
651 #ifdef CONFIG_OF
652 static struct max17042_platform_data *
653 max17042_get_pdata(struct device *dev)
654 {
655 struct device_node *np = dev->of_node;
656 u32 prop;
657 struct max17042_platform_data *pdata;
658
659 if (!np)
660 return dev->platform_data;
661
662 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
663 if (!pdata)
664 return NULL;
665
666 /*
667 * Require current sense resistor value to be specified for
668 * current-sense functionality to be enabled at all.
669 */
670 if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
671 pdata->r_sns = prop;
672 pdata->enable_current_sense = true;
673 }
674
675 return pdata;
676 }
677 #else
678 static struct max17042_platform_data *
679 max17042_get_pdata(struct device *dev)
680 {
681 return dev->platform_data;
682 }
683 #endif
684
685 static int max17042_probe(struct i2c_client *client,
686 const struct i2c_device_id *id)
687 {
688 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
689 struct max17042_chip *chip;
690 int ret;
691 int reg;
692
693 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
694 return -EIO;
695
696 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
697 if (!chip)
698 return -ENOMEM;
699
700 chip->client = client;
701 chip->pdata = max17042_get_pdata(&client->dev);
702 if (!chip->pdata) {
703 dev_err(&client->dev, "no platform data provided\n");
704 return -EINVAL;
705 }
706
707 i2c_set_clientdata(client, chip);
708
709 ret = max17042_read_reg(chip->client, MAX17042_DevName);
710 if (ret == MAX17042_IC_VERSION) {
711 dev_dbg(&client->dev, "chip type max17042 detected\n");
712 chip->chip_type = MAX17042;
713 } else if (ret == MAX17047_IC_VERSION) {
714 dev_dbg(&client->dev, "chip type max17047/50 detected\n");
715 chip->chip_type = MAX17047;
716 } else {
717 dev_err(&client->dev, "device version mismatch: %x\n", ret);
718 return -EIO;
719 }
720
721 chip->battery.name = "max170xx_battery";
722 chip->battery.type = POWER_SUPPLY_TYPE_BATTERY;
723 chip->battery.get_property = max17042_get_property;
724 chip->battery.properties = max17042_battery_props;
725 chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props);
726
727 /* When current is not measured,
728 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
729 if (!chip->pdata->enable_current_sense)
730 chip->battery.num_properties -= 2;
731
732 if (chip->pdata->r_sns == 0)
733 chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
734
735 if (chip->pdata->init_data)
736 max17042_set_reg(client, chip->pdata->init_data,
737 chip->pdata->num_init_data);
738
739 if (!chip->pdata->enable_current_sense) {
740 max17042_write_reg(client, MAX17042_CGAIN, 0x0000);
741 max17042_write_reg(client, MAX17042_MiscCFG, 0x0003);
742 max17042_write_reg(client, MAX17042_LearnCFG, 0x0007);
743 }
744
745 ret = power_supply_register(&client->dev, &chip->battery);
746 if (ret) {
747 dev_err(&client->dev, "failed: power supply register\n");
748 return ret;
749 }
750
751 if (client->irq) {
752 ret = request_threaded_irq(client->irq, NULL,
753 max17042_thread_handler,
754 IRQF_TRIGGER_FALLING,
755 chip->battery.name, chip);
756 if (!ret) {
757 reg = max17042_read_reg(client, MAX17042_CONFIG);
758 reg |= CONFIG_ALRT_BIT_ENBL;
759 max17042_write_reg(client, MAX17042_CONFIG, reg);
760 max17042_set_soc_threshold(chip, 1);
761 } else {
762 client->irq = 0;
763 dev_err(&client->dev, "%s(): cannot get IRQ\n",
764 __func__);
765 }
766 }
767
768 reg = max17042_read_reg(chip->client, MAX17042_STATUS);
769 if (reg & STATUS_POR_BIT) {
770 INIT_WORK(&chip->work, max17042_init_worker);
771 schedule_work(&chip->work);
772 } else {
773 chip->init_complete = 1;
774 }
775
776 return 0;
777 }
778
779 static int max17042_remove(struct i2c_client *client)
780 {
781 struct max17042_chip *chip = i2c_get_clientdata(client);
782
783 if (client->irq)
784 free_irq(client->irq, chip);
785 power_supply_unregister(&chip->battery);
786 return 0;
787 }
788
789 #ifdef CONFIG_PM
790 static int max17042_suspend(struct device *dev)
791 {
792 struct max17042_chip *chip = dev_get_drvdata(dev);
793
794 /*
795 * disable the irq and enable irq_wake
796 * capability to the interrupt line.
797 */
798 if (chip->client->irq) {
799 disable_irq(chip->client->irq);
800 enable_irq_wake(chip->client->irq);
801 }
802
803 return 0;
804 }
805
806 static int max17042_resume(struct device *dev)
807 {
808 struct max17042_chip *chip = dev_get_drvdata(dev);
809
810 if (chip->client->irq) {
811 disable_irq_wake(chip->client->irq);
812 enable_irq(chip->client->irq);
813 /* re-program the SOC thresholds to 1% change */
814 max17042_set_soc_threshold(chip, 1);
815 }
816
817 return 0;
818 }
819
820 static const struct dev_pm_ops max17042_pm_ops = {
821 .suspend = max17042_suspend,
822 .resume = max17042_resume,
823 };
824
825 #define MAX17042_PM_OPS (&max17042_pm_ops)
826 #else
827 #define MAX17042_PM_OPS NULL
828 #endif
829
830 #ifdef CONFIG_OF
831 static const struct of_device_id max17042_dt_match[] = {
832 { .compatible = "maxim,max17042" },
833 { .compatible = "maxim,max17047" },
834 { .compatible = "maxim,max17050" },
835 { },
836 };
837 MODULE_DEVICE_TABLE(of, max17042_dt_match);
838 #endif
839
840 static const struct i2c_device_id max17042_id[] = {
841 { "max17042", 0 },
842 { "max17047", 1 },
843 { "max17050", 2 },
844 { }
845 };
846 MODULE_DEVICE_TABLE(i2c, max17042_id);
847
848 static struct i2c_driver max17042_i2c_driver = {
849 .driver = {
850 .name = "max17042",
851 .of_match_table = of_match_ptr(max17042_dt_match),
852 .pm = MAX17042_PM_OPS,
853 },
854 .probe = max17042_probe,
855 .remove = max17042_remove,
856 .id_table = max17042_id,
857 };
858 module_i2c_driver(max17042_i2c_driver);
859
860 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
861 MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
862 MODULE_LICENSE("GPL");
Linux with added FPC-III support