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power_supply: Add support for TI BQ25890 charger chip
[linux-2.6-block.git] / drivers / power / max17042_battery.c
CommitLineData
359ab9f5
MH		 1/*
2 * Fuel gauge driver for Maxim 17042 / 8966 / 8997
3 * Note that Maxim 8966 and 8997 are mfd and this is its subdevice.
4 *
5 * Copyright (C) 2011 Samsung Electronics
6 * MyungJoo Ham <myungjoo.ham@samsung.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * This driver is based on max17040_battery.c
23 */
24
25#include <linux/init.h>
7e6d62db 26#include <linux/module.h>
359ab9f5
MH		 27#include <linux/slab.h>
28#include <linux/i2c.h>
f3a71a6e 29#include <linux/delay.h>
e5f3872d 30#include <linux/interrupt.h>
48bc1774 31#include <linux/pm.h>
359ab9f5
MH		 32#include <linux/mod_devicetable.h>
33#include <linux/power_supply.h>
34#include <linux/power/max17042_battery.h>
3832246d 35#include <linux/of.h>
39e7213e 36#include <linux/regmap.h>
359ab9f5 37
f3a71a6e
RP		 38/* Status register bits */
39#define STATUS_POR_BIT (1 << 1)
40#define STATUS_BST_BIT (1 << 3)
41#define STATUS_VMN_BIT (1 << 8)
42#define STATUS_TMN_BIT (1 << 9)
43#define STATUS_SMN_BIT (1 << 10)
44#define STATUS_BI_BIT (1 << 11)
45#define STATUS_VMX_BIT (1 << 12)
46#define STATUS_TMX_BIT (1 << 13)
47#define STATUS_SMX_BIT (1 << 14)
48#define STATUS_BR_BIT (1 << 15)
49
e5f3872d
RP		 50/* Interrupt mask bits */
51#define CONFIG_ALRT_BIT_ENBL (1 << 2)
5cdd4d7f
RP		 52#define STATUS_INTR_SOCMIN_BIT (1 << 10)
53#define STATUS_INTR_SOCMAX_BIT (1 << 14)
e5f3872d 54
f3a71a6e
RP		 55#define VFSOC0_LOCK 0x0000
56#define VFSOC0_UNLOCK 0x0080
57#define MODEL_UNLOCK1 0X0059
58#define MODEL_UNLOCK2 0X00C4
59#define MODEL_LOCK1 0X0000
60#define MODEL_LOCK2 0X0000
61
62#define dQ_ACC_DIV 0x4
63#define dP_ACC_100 0x1900
64#define dP_ACC_200 0x3200
65
359ab9f5
MH		 66struct max17042_chip {
67 struct i2c_client *client;
39e7213e 68 struct regmap *regmap;
297d716f 69 struct power_supply *battery;
9a8422d2 70 enum max170xx_chip_type chip_type;
359ab9f5 71 struct max17042_platform_data *pdata;
f3a71a6e
RP		 72 struct work_struct work;
73 int init_complete;
359ab9f5
MH		 74};
75
359ab9f5 76static enum power_supply_property max17042_battery_props[] = {
086ef502
DK		 77 POWER_SUPPLY_PROP_PRESENT,
78 POWER_SUPPLY_PROP_CYCLE_COUNT,
79 POWER_SUPPLY_PROP_VOLTAGE_MAX,
80 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
359ab9f5
MH		 81 POWER_SUPPLY_PROP_VOLTAGE_NOW,
82 POWER_SUPPLY_PROP_VOLTAGE_AVG,
a2ebfe2f 83 POWER_SUPPLY_PROP_VOLTAGE_OCV,
359ab9f5 84 POWER_SUPPLY_PROP_CAPACITY,
086ef502 85 POWER_SUPPLY_PROP_CHARGE_FULL,
5fc55bc8 86 POWER_SUPPLY_PROP_CHARGE_COUNTER,
086ef502
DK		 87 POWER_SUPPLY_PROP_TEMP,
88 POWER_SUPPLY_PROP_CURRENT_NOW,
89 POWER_SUPPLY_PROP_CURRENT_AVG,
359ab9f5
MH		 90};
91
92static int max17042_get_property(struct power_supply *psy,
93 enum power_supply_property psp,
94 union power_supply_propval *val)
95{
297d716f 96 struct max17042_chip *chip = power_supply_get_drvdata(psy);
39e7213e 97 struct regmap *map = chip->regmap;
60a1f6e4 98 int ret;
39e7213e 99 u32 data;
359ab9f5 100
f3a71a6e
RP		 101 if (!chip->init_complete)
102 return -EAGAIN;
103
359ab9f5 104 switch (psp) {
086ef502 105 case POWER_SUPPLY_PROP_PRESENT:
39e7213e 106 ret = regmap_read(map, MAX17042_STATUS, &data);
60a1f6e4
RP		 107 if (ret < 0)
108 return ret;
109
39e7213e 110 if (data & MAX17042_STATUS_BattAbsent)
086ef502
DK		 111 val->intval = 0;
112 else
113 val->intval = 1;
114 break;
115 case POWER_SUPPLY_PROP_CYCLE_COUNT:
39e7213e 116 ret = regmap_read(map, MAX17042_Cycles, &data);
60a1f6e4
RP		 117 if (ret < 0)
118 return ret;
119
39e7213e 120 val->intval = data;
086ef502
DK		 121 break;
122 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
39e7213e 123 ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
60a1f6e4
RP		 124 if (ret < 0)
125 return ret;
126
39e7213e 127 val->intval = data >> 8;
086ef502
DK		 128 val->intval *= 20000; /* Units of LSB = 20mV */
129 break;
130 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
709c2c70 131 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
39e7213e 132 ret = regmap_read(map, MAX17042_V_empty, &data);
9a8422d2 133 else
39e7213e 134 ret = regmap_read(map, MAX17047_V_empty, &data);
60a1f6e4
RP		 135 if (ret < 0)
136 return ret;
137
39e7213e 138 val->intval = data >> 7;
086ef502
DK		 139 val->intval *= 10000; /* Units of LSB = 10mV */
140 break;
359ab9f5 141 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
39e7213e 142 ret = regmap_read(map, MAX17042_VCELL, &data);
60a1f6e4
RP		 143 if (ret < 0)
144 return ret;
145
39e7213e 146 val->intval = data * 625 / 8;
359ab9f5
MH		 147 break;
148 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
39e7213e 149 ret = regmap_read(map, MAX17042_AvgVCELL, &data);
60a1f6e4
RP		 150 if (ret < 0)
151 return ret;
152
39e7213e 153 val->intval = data * 625 / 8;
a2ebfe2f
RP		 154 break;
155 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
39e7213e 156 ret = regmap_read(map, MAX17042_OCVInternal, &data);
a2ebfe2f
RP		 157 if (ret < 0)
158 return ret;
159
39e7213e 160 val->intval = data * 625 / 8;
359ab9f5
MH		 161 break;
162 case POWER_SUPPLY_PROP_CAPACITY:
39e7213e 163 ret = regmap_read(map, MAX17042_RepSOC, &data);
60a1f6e4
RP		 164 if (ret < 0)
165 return ret;
166
39e7213e 167 val->intval = data >> 8;
359ab9f5 168 break;
086ef502 169 case POWER_SUPPLY_PROP_CHARGE_FULL:
39e7213e 170 ret = regmap_read(map, MAX17042_FullCAP, &data);
60a1f6e4
RP		 171 if (ret < 0)
172 return ret;
173
39e7213e 174 val->intval = data * 1000 / 2;
5fc55bc8
RP		 175 break;
176 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
39e7213e 177 ret = regmap_read(map, MAX17042_QH, &data);
5fc55bc8
RP		 178 if (ret < 0)
179 return ret;
180
39e7213e 181 val->intval = data * 1000 / 2;
086ef502
DK		 182 break;
183 case POWER_SUPPLY_PROP_TEMP:
39e7213e 184 ret = regmap_read(map, MAX17042_TEMP, &data);
60a1f6e4
RP		 185 if (ret < 0)
186 return ret;
187
39e7213e 188 val->intval = data;
086ef502
DK		 189 /* The value is signed. */
190 if (val->intval & 0x8000) {
191 val->intval = (0x7fff & ~val->intval) + 1;
192 val->intval *= -1;
193 }
194 /* The value is converted into deci-centigrade scale */
195 /* Units of LSB = 1 / 256 degree Celsius */
196 val->intval = val->intval * 10 / 256;
197 break;
198 case POWER_SUPPLY_PROP_CURRENT_NOW:
199 if (chip->pdata->enable_current_sense) {
39e7213e 200 ret = regmap_read(map, MAX17042_Current, &data);
60a1f6e4
RP		 201 if (ret < 0)
202 return ret;
203
39e7213e 204 val->intval = data;
086ef502
DK		 205 if (val->intval & 0x8000) {
206 /* Negative */
207 val->intval = ~val->intval & 0x7fff;
208 val->intval++;
209 val->intval *= -1;
210 }
91d8b0d6 211 val->intval *= 1562500 / chip->pdata->r_sns;
086ef502
DK		 212 } else {
213 return -EINVAL;
214 }
215 break;
216 case POWER_SUPPLY_PROP_CURRENT_AVG:
217 if (chip->pdata->enable_current_sense) {
39e7213e 218 ret = regmap_read(map, MAX17042_AvgCurrent, &data);
60a1f6e4
RP		 219 if (ret < 0)
220 return ret;
221
39e7213e 222 val->intval = data;
086ef502
DK		 223 if (val->intval & 0x8000) {
224 /* Negative */
225 val->intval = ~val->intval & 0x7fff;
226 val->intval++;
227 val->intval *= -1;
228 }
229 val->intval *= 1562500 / chip->pdata->r_sns;
230 } else {
231 return -EINVAL;
232 }
233 break;
359ab9f5
MH		 234 default:
235 return -EINVAL;
236 }
237 return 0;
238}
239
39e7213e 240static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value)
f3a71a6e
RP		 241{
242 int retries = 8;
243 int ret;
39e7213e 244 u32 read_value;
f3a71a6e
RP		 245
246 do {
39e7213e
JL		 247 ret = regmap_write(map, reg, value);
248 regmap_read(map, reg, &read_value);
f3a71a6e
RP		 249 if (read_value != value) {
250 ret = -EIO;
251 retries--;
252 }
253 } while (retries && read_value != value);
254
255 if (ret < 0)
39e7213e 256 pr_err("%s: err %d\n", __func__, ret);
f3a71a6e
RP		 257
258 return ret;
259}
260
39e7213e
JL		 261static inline void max17042_override_por(struct regmap *map,
262 u8 reg, u16 value)
f3a71a6e
RP		 263{
264 if (value)
39e7213e 265 regmap_write(map, reg, value);
f3a71a6e
RP		 266}
267
268static inline void max10742_unlock_model(struct max17042_chip *chip)
269{
39e7213e 270 struct regmap *map = chip->regmap;
bbaeeaaf 271
39e7213e
JL		 272 regmap_write(map, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
273 regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
f3a71a6e
RP		 274}
275
276static inline void max10742_lock_model(struct max17042_chip *chip)
277{
39e7213e
JL		 278 struct regmap *map = chip->regmap;
279
280 regmap_write(map, MAX17042_MLOCKReg1, MODEL_LOCK1);
281 regmap_write(map, MAX17042_MLOCKReg2, MODEL_LOCK2);
f3a71a6e
RP		 282}
283
284static inline void max17042_write_model_data(struct max17042_chip *chip,
285 u8 addr, int size)
286{
39e7213e 287 struct regmap *map = chip->regmap;
f3a71a6e 288 int i;
bbaeeaaf 289
f3a71a6e 290 for (i = 0; i < size; i++)
39e7213e
JL		 291 regmap_write(map, addr + i,
292 chip->pdata->config_data->cell_char_tbl[i]);
f3a71a6e
RP		 293}
294
295static inline void max17042_read_model_data(struct max17042_chip *chip,
39e7213e 296 u8 addr, u32 *data, int size)
f3a71a6e 297{
39e7213e 298 struct regmap *map = chip->regmap;
f3a71a6e
RP		 299 int i;
300
301 for (i = 0; i < size; i++)
39e7213e 302 regmap_read(map, addr + i, &data[i]);
f3a71a6e
RP		 303}
304
305static inline int max17042_model_data_compare(struct max17042_chip *chip,
306 u16 *data1, u16 *data2, int size)
307{
308 int i;
309
310 if (memcmp(data1, data2, size)) {
311 dev_err(&chip->client->dev, "%s compare failed\n", __func__);
312 for (i = 0; i < size; i++)
313 dev_info(&chip->client->dev, "0x%x, 0x%x",
314 data1[i], data2[i]);
315 dev_info(&chip->client->dev, "\n");
316 return -EINVAL;
317 }
318 return 0;
319}
320
321static int max17042_init_model(struct max17042_chip *chip)
322{
323 int ret;
1ef3d8fb 324 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
39e7213e 325 u32 *temp_data;
f3a71a6e 326
1ef3d8fb 327 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
f3a71a6e
RP		 328 if (!temp_data)
329 return -ENOMEM;
330
331 max10742_unlock_model(chip);
332 max17042_write_model_data(chip, MAX17042_MODELChrTbl,
333 table_size);
334 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
335 table_size);
336
337 ret = max17042_model_data_compare(
338 chip,
339 chip->pdata->config_data->cell_char_tbl,
39e7213e 340 (u16 *)temp_data,
f3a71a6e
RP		 341 table_size);
342
343 max10742_lock_model(chip);
344 kfree(temp_data);
345
346 return ret;
347}
348
349static int max17042_verify_model_lock(struct max17042_chip *chip)
350{
351 int i;
1ef3d8fb 352 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
39e7213e 353 u32 *temp_data;
f3a71a6e
RP		 354 int ret = 0;
355
1ef3d8fb 356 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
f3a71a6e
RP		 357 if (!temp_data)
358 return -ENOMEM;
359
360 max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
361 table_size);
362 for (i = 0; i < table_size; i++)
363 if (temp_data[i])
364 ret = -EINVAL;
365
366 kfree(temp_data);
367 return ret;
368}
369
370static void max17042_write_config_regs(struct max17042_chip *chip)
371{
372 struct max17042_config_data *config = chip->pdata->config_data;
39e7213e 373 struct regmap *map = chip->regmap;
f3a71a6e 374
39e7213e
JL		 375 regmap_write(map, MAX17042_CONFIG, config->config);
376 regmap_write(map, MAX17042_LearnCFG, config->learn_cfg);
377 regmap_write(map, MAX17042_FilterCFG,
f3a71a6e 378 config->filter_cfg);
39e7213e 379 regmap_write(map, MAX17042_RelaxCFG, config->relax_cfg);
709c2c70
BS		 380 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047 ||
381 chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)
39e7213e 382 regmap_write(map, MAX17047_FullSOCThr,
9a8422d2 383 config->full_soc_thresh);
f3a71a6e
RP		 384}
385
386static void max17042_write_custom_regs(struct max17042_chip *chip)
387{
388 struct max17042_config_data *config = chip->pdata->config_data;
39e7213e 389 struct regmap *map = chip->regmap;
f3a71a6e 390
39e7213e
JL		 391 max17042_write_verify_reg(map, MAX17042_RCOMP0, config->rcomp0);
392 max17042_write_verify_reg(map, MAX17042_TempCo, config->tcompc0);
393 max17042_write_verify_reg(map, MAX17042_ICHGTerm, config->ichgt_term);
709c2c70 394 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) {
39e7213e
JL		 395 regmap_write(map, MAX17042_EmptyTempCo, config->empty_tempco);
396 max17042_write_verify_reg(map, MAX17042_K_empty0,
9a8422d2
RP		 397 config->kempty0);
398 } else {
39e7213e 399 max17042_write_verify_reg(map, MAX17047_QRTbl00,
9a8422d2 400 config->qrtbl00);
39e7213e 401 max17042_write_verify_reg(map, MAX17047_QRTbl10,
9a8422d2 402 config->qrtbl10);
39e7213e 403 max17042_write_verify_reg(map, MAX17047_QRTbl20,
9a8422d2 404 config->qrtbl20);
39e7213e 405 max17042_write_verify_reg(map, MAX17047_QRTbl30,
9a8422d2
RP		 406 config->qrtbl30);
407 }
f3a71a6e
RP		 408}
409
410static void max17042_update_capacity_regs(struct max17042_chip *chip)
411{
412 struct max17042_config_data *config = chip->pdata->config_data;
39e7213e 413 struct regmap *map = chip->regmap;
f3a71a6e 414
39e7213e 415 max17042_write_verify_reg(map, MAX17042_FullCAP,
f3a71a6e 416 config->fullcap);
39e7213e
JL		 417 regmap_write(map, MAX17042_DesignCap, config->design_cap);
418 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
f3a71a6e
RP		 419 config->fullcapnom);
420}
421
422static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
423{
39e7213e
JL		 424 unsigned int vfSoc;
425 struct regmap *map = chip->regmap;
f3a71a6e 426
39e7213e
JL		 427 regmap_read(map, MAX17042_VFSOC, &vfSoc);
428 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
429 max17042_write_verify_reg(map, MAX17042_VFSOC0, vfSoc);
430 regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
f3a71a6e
RP		 431}
432
433static void max17042_load_new_capacity_params(struct max17042_chip *chip)
434{
39e7213e 435 u32 full_cap0, rep_cap, dq_acc, vfSoc;
f3a71a6e
RP		 436 u32 rem_cap;
437
438 struct max17042_config_data *config = chip->pdata->config_data;
39e7213e 439 struct regmap *map = chip->regmap;
f3a71a6e 440
39e7213e
JL		 441 regmap_read(map, MAX17042_FullCAP0, &full_cap0);
442 regmap_read(map, MAX17042_VFSOC, &vfSoc);
f3a71a6e
RP		 443
444 /* fg_vfSoc needs to shifted by 8 bits to get the
445 * perc in 1% accuracy, to get the right rem_cap multiply
446 * full_cap0, fg_vfSoc and devide by 100
447 */
448 rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
39e7213e 449 max17042_write_verify_reg(map, MAX17042_RemCap, rem_cap);
f3a71a6e 450
39e7213e
JL		 451 rep_cap = rem_cap;
452 max17042_write_verify_reg(map, MAX17042_RepCap, rep_cap);
f3a71a6e
RP		 453
454 /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
455 dq_acc = config->fullcap / dQ_ACC_DIV;
39e7213e
JL		 456 max17042_write_verify_reg(map, MAX17042_dQacc, dq_acc);
457 max17042_write_verify_reg(map, MAX17042_dPacc, dP_ACC_200);
f3a71a6e 458
39e7213e 459 max17042_write_verify_reg(map, MAX17042_FullCAP,
f3a71a6e 460 config->fullcap);
39e7213e 461 regmap_write(map, MAX17042_DesignCap,
f3a71a6e 462 config->design_cap);
39e7213e 463 max17042_write_verify_reg(map, MAX17042_FullCAPNom,
f3a71a6e 464 config->fullcapnom);
9a8422d2 465 /* Update SOC register with new SOC */
39e7213e 466 regmap_write(map, MAX17042_RepSOC, vfSoc);
f3a71a6e
RP		 467}
468
469/*
470 * Block write all the override values coming from platform data.
471 * This function MUST be called before the POR initialization proceedure
472 * specified by maxim.
473 */
474static inline void max17042_override_por_values(struct max17042_chip *chip)
475{
39e7213e 476 struct regmap *map = chip->regmap;
f3a71a6e
RP		 477 struct max17042_config_data *config = chip->pdata->config_data;
478
39e7213e
JL		 479 max17042_override_por(map, MAX17042_TGAIN, config->tgain);
480 max17042_override_por(map, MAx17042_TOFF, config->toff);
481 max17042_override_por(map, MAX17042_CGAIN, config->cgain);
482 max17042_override_por(map, MAX17042_COFF, config->coff);
483
484 max17042_override_por(map, MAX17042_VALRT_Th, config->valrt_thresh);
485 max17042_override_por(map, MAX17042_TALRT_Th, config->talrt_thresh);
486 max17042_override_por(map, MAX17042_SALRT_Th,
487 config->soc_alrt_thresh);
488 max17042_override_por(map, MAX17042_CONFIG, config->config);
489 max17042_override_por(map, MAX17042_SHDNTIMER, config->shdntimer);
490
491 max17042_override_por(map, MAX17042_DesignCap, config->design_cap);
492 max17042_override_por(map, MAX17042_ICHGTerm, config->ichgt_term);
493
494 max17042_override_por(map, MAX17042_AtRate, config->at_rate);
495 max17042_override_por(map, MAX17042_LearnCFG, config->learn_cfg);
496 max17042_override_por(map, MAX17042_FilterCFG, config->filter_cfg);
497 max17042_override_por(map, MAX17042_RelaxCFG, config->relax_cfg);
498 max17042_override_por(map, MAX17042_MiscCFG, config->misc_cfg);
499 max17042_override_por(map, MAX17042_MaskSOC, config->masksoc);
500
501 max17042_override_por(map, MAX17042_FullCAP, config->fullcap);
502 max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom);
709c2c70 503 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
39e7213e 504 max17042_override_por(map, MAX17042_SOC_empty,
9a8422d2 505 config->socempty);
39e7213e
JL		 506 max17042_override_por(map, MAX17042_LAvg_empty, config->lavg_empty);
507 max17042_override_por(map, MAX17042_dQacc, config->dqacc);
508 max17042_override_por(map, MAX17042_dPacc, config->dpacc);
f3a71a6e 509
709c2c70 510 if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
39e7213e 511 max17042_override_por(map, MAX17042_V_empty, config->vempty);
9a8422d2 512 else
39e7213e
JL		 513 max17042_override_por(map, MAX17047_V_empty, config->vempty);
514 max17042_override_por(map, MAX17042_TempNom, config->temp_nom);
515 max17042_override_por(map, MAX17042_TempLim, config->temp_lim);
516 max17042_override_por(map, MAX17042_FCTC, config->fctc);
517 max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0);
518 max17042_override_por(map, MAX17042_TempCo, config->tcompc0);
9a8422d2 519 if (chip->chip_type) {
39e7213e
JL		 520 max17042_override_por(map, MAX17042_EmptyTempCo,
521 config->empty_tempco);
522 max17042_override_por(map, MAX17042_K_empty0,
523 config->kempty0);
9a8422d2 524 }
f3a71a6e
RP		 525}
526
527static int max17042_init_chip(struct max17042_chip *chip)
528{
39e7213e 529 struct regmap *map = chip->regmap;
f3a71a6e 530 int ret;
f3a71a6e
RP		 531
532 max17042_override_por_values(chip);
533 /* After Power up, the MAX17042 requires 500mS in order
534 * to perform signal debouncing and initial SOC reporting
535 */
536 msleep(500);
537
538 /* Initialize configaration */
539 max17042_write_config_regs(chip);
540
541 /* write cell characterization data */
542 ret = max17042_init_model(chip);
543 if (ret) {
544 dev_err(&chip->client->dev, "%s init failed\n",
545 __func__);
546 return -EIO;
547 }
a879f19f
AC		 548
549 ret = max17042_verify_model_lock(chip);
f3a71a6e
RP		 550 if (ret) {
551 dev_err(&chip->client->dev, "%s lock verify failed\n",
552 __func__);
553 return -EIO;
554 }
555 /* write custom parameters */
556 max17042_write_custom_regs(chip);
557
558 /* update capacity params */
559 max17042_update_capacity_regs(chip);
560
561 /* delay must be atleast 350mS to allow VFSOC
562 * to be calculated from the new configuration
563 */
564 msleep(350);
565
566 /* reset vfsoc0 reg */
567 max17042_reset_vfsoc0_reg(chip);
568
569 /* load new capacity params */
570 max17042_load_new_capacity_params(chip);
571
572 /* Init complete, Clear the POR bit */
bc352686 573 regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0);
f3a71a6e
RP		 574 return 0;
575}
576
e5f3872d
RP		 577static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
578{
39e7213e
JL		 579 struct regmap *map = chip->regmap;
580 u32 soc, soc_tr;
e5f3872d
RP		 581
582 /* program interrupt thesholds such that we should
583 * get interrupt for every 'off' perc change in the soc
584 */
39e7213e
JL		 585 regmap_read(map, MAX17042_RepSOC, &soc);
586 soc >>= 8;
e5f3872d
RP		 587 soc_tr = (soc + off) << 8;
588 soc_tr |= (soc - off);
39e7213e 589 regmap_write(map, MAX17042_SALRT_Th, soc_tr);
e5f3872d
RP		 590}
591
e5f3872d
RP		 592static irqreturn_t max17042_thread_handler(int id, void *dev)
593{
594 struct max17042_chip *chip = dev;
39e7213e 595 u32 val;
e5f3872d 596
39e7213e 597 regmap_read(chip->regmap, MAX17042_STATUS, &val);
5cdd4d7f
RP		 598 if ((val & STATUS_INTR_SOCMIN_BIT) ||
599 (val & STATUS_INTR_SOCMAX_BIT)) {
e5f3872d
RP		 600 dev_info(&chip->client->dev, "SOC threshold INTR\n");
601 max17042_set_soc_threshold(chip, 1);
602 }
603
297d716f 604 power_supply_changed(chip->battery);
e5f3872d
RP		 605 return IRQ_HANDLED;
606}
f3a71a6e
RP		 607
608static void max17042_init_worker(struct work_struct *work)
609{
610 struct max17042_chip *chip = container_of(work,
611 struct max17042_chip, work);
612 int ret;
613
614 /* Initialize registers according to values from the platform data */
615 if (chip->pdata->enable_por_init && chip->pdata->config_data) {
616 ret = max17042_init_chip(chip);
617 if (ret)
618 return;
619 }
620
621 chip->init_complete = 1;
622}
623
3832246d
KL		 624#ifdef CONFIG_OF
625static struct max17042_platform_data *
626max17042_get_pdata(struct device *dev)
627{
628 struct device_node *np = dev->of_node;
629 u32 prop;
630 struct max17042_platform_data *pdata;
631
632 if (!np)
633 return dev->platform_data;
634
635 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
636 if (!pdata)
637 return NULL;
638
639 /*
640 * Require current sense resistor value to be specified for
641 * current-sense functionality to be enabled at all.
642 */
643 if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
644 pdata->r_sns = prop;
645 pdata->enable_current_sense = true;
646 }
647
648 return pdata;
649}
650#else
651static struct max17042_platform_data *
652max17042_get_pdata(struct device *dev)
653{
654 return dev->platform_data;
655}
656#endif
657
e0291285 658static const struct regmap_config max17042_regmap_config = {
39e7213e
JL		 659 .reg_bits = 8,
660 .val_bits = 16,
661 .val_format_endian = REGMAP_ENDIAN_NATIVE,
662};
663
297d716f
KK		 664static const struct power_supply_desc max17042_psy_desc = {
665 .name = "max170xx_battery",
666 .type = POWER_SUPPLY_TYPE_BATTERY,
667 .get_property = max17042_get_property,
668 .properties = max17042_battery_props,
669 .num_properties = ARRAY_SIZE(max17042_battery_props),
670};
671
672static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
673 .name = "max170xx_battery",
674 .type = POWER_SUPPLY_TYPE_BATTERY,
675 .get_property = max17042_get_property,
676 .properties = max17042_battery_props,
677 .num_properties = ARRAY_SIZE(max17042_battery_props) - 2,
678};
679
c8afa640 680static int max17042_probe(struct i2c_client *client,
359ab9f5
MH		 681 const struct i2c_device_id *id)
682{
683 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
297d716f
KK		 684 const struct power_supply_desc *max17042_desc = &max17042_psy_desc;
685 struct power_supply_config psy_cfg = {};
359ab9f5
MH		 686 struct max17042_chip *chip;
687 int ret;
39e7213e
JL		 688 int i;
689 u32 val;
359ab9f5
MH		 690
691 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
692 return -EIO;
693
2f3b4342 694 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
359ab9f5
MH		 695 if (!chip)
696 return -ENOMEM;
697
698 chip->client = client;
39e7213e
JL		 699 chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config);
700 if (IS_ERR(chip->regmap)) {
701 dev_err(&client->dev, "Failed to initialize regmap\n");
702 return -EINVAL;
703 }
704
3832246d
KL		 705 chip->pdata = max17042_get_pdata(&client->dev);
706 if (!chip->pdata) {
707 dev_err(&client->dev, "no platform data provided\n");
708 return -EINVAL;
709 }
359ab9f5
MH		 710
711 i2c_set_clientdata(client, chip);
709c2c70 712 chip->chip_type = id->driver_data;
297d716f 713 psy_cfg.drv_data = chip;
359ab9f5 714
086ef502
DK		 715 /* When current is not measured,
716 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
717 if (!chip->pdata->enable_current_sense)
297d716f 718 max17042_desc = &max17042_no_current_sense_psy_desc;
086ef502 719
4cfa892c
PR		 720 if (chip->pdata->r_sns == 0)
721 chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
722
086ef502 723 if (chip->pdata->init_data)
39e7213e
JL		 724 for (i = 0; i < chip->pdata->num_init_data; i++)
725 regmap_write(chip->regmap,
726 chip->pdata->init_data[i].addr,
727 chip->pdata->init_data[i].data);
086ef502 728
359ab9f5 729 if (!chip->pdata->enable_current_sense) {
39e7213e
JL		 730 regmap_write(chip->regmap, MAX17042_CGAIN, 0x0000);
731 regmap_write(chip->regmap, MAX17042_MiscCFG, 0x0003);
732 regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007);
359ab9f5
MH		 733 }
734
297d716f
KK		 735 chip->battery = power_supply_register(&client->dev, max17042_desc,
736 &psy_cfg);
737 if (IS_ERR(chip->battery)) {
243e3527 738 dev_err(&client->dev, "failed: power supply register\n");
297d716f 739 return PTR_ERR(chip->battery);
243e3527
RP		 740 }
741
e5f3872d 742 if (client->irq) {
5cdd4d7f 743 ret = request_threaded_irq(client->irq, NULL,
26740dbb
JL		 744 max17042_thread_handler,
745 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
297d716f 746 chip->battery->desc->name, chip);
e5f3872d 747 if (!ret) {
bc352686
KK		 748 regmap_update_bits(chip->regmap, MAX17042_CONFIG,
749 CONFIG_ALRT_BIT_ENBL,
750 CONFIG_ALRT_BIT_ENBL);
e5f3872d 751 max17042_set_soc_threshold(chip, 1);
e5ba50bc
RP		 752 } else {
753 client->irq = 0;
e5f3872d
RP		 754 dev_err(&client->dev, "%s(): cannot get IRQ\n",
755 __func__);
e5ba50bc 756 }
e5f3872d
RP		 757 }
758
39e7213e
JL		 759 regmap_read(chip->regmap, MAX17042_STATUS, &val);
760 if (val & STATUS_POR_BIT) {
f3a71a6e
RP		 761 INIT_WORK(&chip->work, max17042_init_worker);
762 schedule_work(&chip->work);
763 } else {
764 chip->init_complete = 1;
765 }
766
243e3527 767 return 0;
359ab9f5
MH		 768}
769
415ec69f 770static int max17042_remove(struct i2c_client *client)
359ab9f5
MH		 771{
772 struct max17042_chip *chip = i2c_get_clientdata(client);
773
bb28da90
RP		 774 if (client->irq)
775 free_irq(client->irq, chip);
297d716f 776 power_supply_unregister(chip->battery);
359ab9f5
MH		 777 return 0;
778}
779
3d23c7f4 780#ifdef CONFIG_PM_SLEEP
48bc1774
RP		 781static int max17042_suspend(struct device *dev)
782{
783 struct max17042_chip *chip = dev_get_drvdata(dev);
784
48e41c70
AV		 785 /*
786 * disable the irq and enable irq_wake
48bc1774
RP		 787 * capability to the interrupt line.
788 */
789 if (chip->client->irq) {
790 disable_irq(chip->client->irq);
791 enable_irq_wake(chip->client->irq);
792 }
793
794 return 0;
795}
796
797static int max17042_resume(struct device *dev)
798{
799 struct max17042_chip *chip = dev_get_drvdata(dev);
800
801 if (chip->client->irq) {
802 disable_irq_wake(chip->client->irq);
803 enable_irq(chip->client->irq);
804 /* re-program the SOC thresholds to 1% change */
805 max17042_set_soc_threshold(chip, 1);
806 }
807
808 return 0;
809}
48bc1774
RP		 810#endif
811
3d23c7f4
MB		 812static SIMPLE_DEV_PM_OPS(max17042_pm_ops, max17042_suspend,
813 max17042_resume);
814
3832246d
KL		 815#ifdef CONFIG_OF
816static const struct of_device_id max17042_dt_match[] = {
817 { .compatible = "maxim,max17042" },
9a8422d2
RP		 818 { .compatible = "maxim,max17047" },
819 { .compatible = "maxim,max17050" },
3832246d
KL		 820 { },
821};
822MODULE_DEVICE_TABLE(of, max17042_dt_match);
823#endif
824
359ab9f5 825static const struct i2c_device_id max17042_id[] = {
709c2c70
BS		 826 { "max17042", MAXIM_DEVICE_TYPE_MAX17042 },
827 { "max17047", MAXIM_DEVICE_TYPE_MAX17047 },
828 { "max17050", MAXIM_DEVICE_TYPE_MAX17050 },
359ab9f5
MH		 829 { }
830};
831MODULE_DEVICE_TABLE(i2c, max17042_id);
832
833static struct i2c_driver max17042_i2c_driver = {
834 .driver = {
835 .name = "max17042",
3832246d 836 .of_match_table = of_match_ptr(max17042_dt_match),
3d23c7f4 837 .pm = &max17042_pm_ops,
359ab9f5
MH		 838 },
839 .probe = max17042_probe,
28ea73f4 840 .remove = max17042_remove,
359ab9f5
MH		 841 .id_table = max17042_id,
842};
5ff92e7a 843module_i2c_driver(max17042_i2c_driver);
359ab9f5
MH		 844
845MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
846MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
847MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)