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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux.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 <[email protected]>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * This driver is based on max17040_battery.c
23 */
24
25#include <linux/init.h>
7e6d62db 26#include <linux/module.h>
359ab9f5
MH		 27#include <linux/slab.h>
28#include <linux/i2c.h>
f3a71a6e 29#include <linux/delay.h>
e5f3872d 30#include <linux/interrupt.h>
48bc1774 31#include <linux/pm.h>
359ab9f5
MH		 32#include <linux/mod_devicetable.h>
33#include <linux/power_supply.h>
34#include <linux/power/max17042_battery.h>
3832246d 35#include <linux/of.h>
359ab9f5 36
f3a71a6e
RP		 37/* Status register bits */
38#define STATUS_POR_BIT (1 << 1)
39#define STATUS_BST_BIT (1 << 3)
40#define STATUS_VMN_BIT (1 << 8)
41#define STATUS_TMN_BIT (1 << 9)
42#define STATUS_SMN_BIT (1 << 10)
43#define STATUS_BI_BIT (1 << 11)
44#define STATUS_VMX_BIT (1 << 12)
45#define STATUS_TMX_BIT (1 << 13)
46#define STATUS_SMX_BIT (1 << 14)
47#define STATUS_BR_BIT (1 << 15)
48
e5f3872d
RP		 49/* Interrupt mask bits */
50#define CONFIG_ALRT_BIT_ENBL (1 << 2)
5cdd4d7f
RP		 51#define STATUS_INTR_SOCMIN_BIT (1 << 10)
52#define STATUS_INTR_SOCMAX_BIT (1 << 14)
e5f3872d 53
f3a71a6e
RP		 54#define VFSOC0_LOCK 0x0000
55#define VFSOC0_UNLOCK 0x0080
56#define MODEL_UNLOCK1 0X0059
57#define MODEL_UNLOCK2 0X00C4
58#define MODEL_LOCK1 0X0000
59#define MODEL_LOCK2 0X0000
60
61#define dQ_ACC_DIV 0x4
62#define dP_ACC_100 0x1900
63#define dP_ACC_200 0x3200
64
9a8422d2
RP		 65#define MAX17042_IC_VERSION 0x0092
66#define MAX17047_IC_VERSION 0x00AC /* same for max17050 */
67
359ab9f5
MH		 68struct max17042_chip {
69 struct i2c_client *client;
70 struct power_supply battery;
9a8422d2 71 enum max170xx_chip_type chip_type;
359ab9f5 72 struct max17042_platform_data *pdata;
f3a71a6e
RP		 73 struct work_struct work;
74 int init_complete;
359ab9f5
MH		 75};
76
77static 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
87static 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
086ef502
DK		 97static 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
359ab9f5 106static enum power_supply_property max17042_battery_props[] = {
086ef502
DK		 107 POWER_SUPPLY_PROP_PRESENT,
108 POWER_SUPPLY_PROP_CYCLE_COUNT,
109 POWER_SUPPLY_PROP_VOLTAGE_MAX,
110 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
359ab9f5
MH		 111 POWER_SUPPLY_PROP_VOLTAGE_NOW,
112 POWER_SUPPLY_PROP_VOLTAGE_AVG,
a2ebfe2f 113 POWER_SUPPLY_PROP_VOLTAGE_OCV,
359ab9f5 114 POWER_SUPPLY_PROP_CAPACITY,
086ef502 115 POWER_SUPPLY_PROP_CHARGE_FULL,
5fc55bc8 116 POWER_SUPPLY_PROP_CHARGE_COUNTER,
086ef502
DK		 117 POWER_SUPPLY_PROP_TEMP,
118 POWER_SUPPLY_PROP_CURRENT_NOW,
119 POWER_SUPPLY_PROP_CURRENT_AVG,
359ab9f5
MH		 120};
121
122static 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);
60a1f6e4 128 int ret;
359ab9f5 129
f3a71a6e
RP		 130 if (!chip->init_complete)
131 return -EAGAIN;
132
359ab9f5 133 switch (psp) {
086ef502 134 case POWER_SUPPLY_PROP_PRESENT:
60a1f6e4
RP		 135 ret = max17042_read_reg(chip->client, MAX17042_STATUS);
136 if (ret < 0)
137 return ret;
138
139 if (ret & MAX17042_STATUS_BattAbsent)
086ef502
DK		 140 val->intval = 0;
141 else
142 val->intval = 1;
143 break;
144 case POWER_SUPPLY_PROP_CYCLE_COUNT:
60a1f6e4
RP		 145 ret = max17042_read_reg(chip->client, MAX17042_Cycles);
146 if (ret < 0)
147 return ret;
148
149 val->intval = ret;
086ef502
DK		 150 break;
151 case POWER_SUPPLY_PROP_VOLTAGE_MAX:
60a1f6e4
RP		 152 ret = max17042_read_reg(chip->client, MAX17042_MinMaxVolt);
153 if (ret < 0)
154 return ret;
155
156 val->intval = ret >> 8;
086ef502
DK		 157 val->intval *= 20000; /* Units of LSB = 20mV */
158 break;
159 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
9a8422d2
RP		 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);
60a1f6e4
RP		 164 if (ret < 0)
165 return ret;
166
167 val->intval = ret >> 7;
086ef502
DK		 168 val->intval *= 10000; /* Units of LSB = 10mV */
169 break;
359ab9f5 170 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
60a1f6e4
RP		 171 ret = max17042_read_reg(chip->client, MAX17042_VCELL);
172 if (ret < 0)
173 return ret;
174
175 val->intval = ret * 625 / 8;
359ab9f5
MH		 176 break;
177 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
60a1f6e4
RP		 178 ret = max17042_read_reg(chip->client, MAX17042_AvgVCELL);
179 if (ret < 0)
180 return ret;
181
a2ebfe2f
RP		 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
60a1f6e4 189 val->intval = ret * 625 / 8;
359ab9f5
MH		 190 break;
191 case POWER_SUPPLY_PROP_CAPACITY:
13e0aa46 192 ret = max17042_read_reg(chip->client, MAX17042_RepSOC);
60a1f6e4
RP		 193 if (ret < 0)
194 return ret;
195
196 val->intval = ret >> 8;
359ab9f5 197 break;
086ef502 198 case POWER_SUPPLY_PROP_CHARGE_FULL:
6e0e60cd 199 ret = max17042_read_reg(chip->client, MAX17042_FullCAP);
60a1f6e4
RP		 200 if (ret < 0)
201 return ret;
202
5fc55bc8
RP		 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
6e0e60cd 210 val->intval = ret * 1000 / 2;
086ef502
DK		 211 break;
212 case POWER_SUPPLY_PROP_TEMP:
60a1f6e4
RP		 213 ret = max17042_read_reg(chip->client, MAX17042_TEMP);
214 if (ret < 0)
215 return ret;
216
217 val->intval = ret;
086ef502
DK		 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) {
60a1f6e4
RP		 229 ret = max17042_read_reg(chip->client, MAX17042_Current);
230 if (ret < 0)
231 return ret;
232
233 val->intval = ret;
086ef502
DK		 234 if (val->intval & 0x8000) {
235 /* Negative */
236 val->intval = ~val->intval & 0x7fff;
237 val->intval++;
238 val->intval *= -1;
239 }
91d8b0d6 240 val->intval *= 1562500 / chip->pdata->r_sns;
086ef502
DK		 241 } else {
242 return -EINVAL;
243 }
244 break;
245 case POWER_SUPPLY_PROP_CURRENT_AVG:
246 if (chip->pdata->enable_current_sense) {
60a1f6e4
RP		 247 ret = max17042_read_reg(chip->client,
248 MAX17042_AvgCurrent);
249 if (ret < 0)
250 return ret;
251
252 val->intval = ret;
086ef502
DK		 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;
359ab9f5
MH		 264 default:
265 return -EINVAL;
266 }
267 return 0;
268}
269
f3a71a6e
RP		 270static 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
292static 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
299static 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
306static 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
313static 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
323static 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
333static 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
349static int max17042_init_model(struct max17042_chip *chip)
350{
351 int ret;
1ef3d8fb 352 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
f3a71a6e
RP		 353 u16 *temp_data;
354
1ef3d8fb 355 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
f3a71a6e
RP		 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
377static int max17042_verify_model_lock(struct max17042_chip *chip)
378{
379 int i;
1ef3d8fb 380 int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
f3a71a6e
RP		 381 u16 *temp_data;
382 int ret = 0;
383
1ef3d8fb 384 temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
f3a71a6e
RP		 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
398static 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);
9a8422d2
RP		 407 if (chip->chip_type == MAX17047)
408 max17042_write_reg(chip->client, MAX17047_FullSOCThr,
409 config->full_soc_thresh);
f3a71a6e
RP		 410}
411
412static 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);
f3a71a6e
RP		 420 max17042_write_verify_reg(chip->client, MAX17042_ICHGTerm,
421 config->ichgt_term);
9a8422d2
RP		 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 }
f3a71a6e
RP		 437}
438
439static 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
451static 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
461static 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);
9a8422d2
RP		 492 /* Update SOC register with new SOC */
493 max17042_write_reg(chip->client, MAX17042_RepSOC, vfSoc);
f3a71a6e
RP		 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 */
501static 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);
9a8422d2
RP		 530 if (chip->chip_type == MAX17042)
531 max17042_override_por(client, MAX17042_SOC_empty,
532 config->socempty);
f3a71a6e
RP		 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
9a8422d2
RP		 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);
f3a71a6e
RP		 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);
9a8422d2
RP		 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 }
f3a71a6e
RP		 552}
553
554static 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 max17042_verify_model_lock(chip);
576 if (ret) {
577 dev_err(&chip->client->dev, "%s lock verify failed\n",
578 __func__);
579 return -EIO;
580 }
581 /* write custom parameters */
582 max17042_write_custom_regs(chip);
583
584 /* update capacity params */
585 max17042_update_capacity_regs(chip);
586
587 /* delay must be atleast 350mS to allow VFSOC
588 * to be calculated from the new configuration
589 */
590 msleep(350);
591
592 /* reset vfsoc0 reg */
593 max17042_reset_vfsoc0_reg(chip);
594
595 /* load new capacity params */
596 max17042_load_new_capacity_params(chip);
597
598 /* Init complete, Clear the POR bit */
599 val = max17042_read_reg(chip->client, MAX17042_STATUS);
600 max17042_write_reg(chip->client, MAX17042_STATUS,
601 val & (~STATUS_POR_BIT));
602 return 0;
603}
604
e5f3872d
RP		 605static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
606{
607 u16 soc, soc_tr;
608
609 /* program interrupt thesholds such that we should
610 * get interrupt for every 'off' perc change in the soc
611 */
612 soc = max17042_read_reg(chip->client, MAX17042_RepSOC) >> 8;
613 soc_tr = (soc + off) << 8;
614 soc_tr |= (soc - off);
615 max17042_write_reg(chip->client, MAX17042_SALRT_Th, soc_tr);
616}
617
e5f3872d
RP		 618static irqreturn_t max17042_thread_handler(int id, void *dev)
619{
620 struct max17042_chip *chip = dev;
621 u16 val;
622
623 val = max17042_read_reg(chip->client, MAX17042_STATUS);
5cdd4d7f
RP		 624 if ((val & STATUS_INTR_SOCMIN_BIT) ||
625 (val & STATUS_INTR_SOCMAX_BIT)) {
e5f3872d
RP		 626 dev_info(&chip->client->dev, "SOC threshold INTR\n");
627 max17042_set_soc_threshold(chip, 1);
628 }
629
630 power_supply_changed(&chip->battery);
631 return IRQ_HANDLED;
632}
f3a71a6e
RP		 633
634static void max17042_init_worker(struct work_struct *work)
635{
636 struct max17042_chip *chip = container_of(work,
637 struct max17042_chip, work);
638 int ret;
639
640 /* Initialize registers according to values from the platform data */
641 if (chip->pdata->enable_por_init && chip->pdata->config_data) {
642 ret = max17042_init_chip(chip);
643 if (ret)
644 return;
645 }
646
647 chip->init_complete = 1;
648}
649
3832246d
KL		 650#ifdef CONFIG_OF
651static struct max17042_platform_data *
652max17042_get_pdata(struct device *dev)
653{
654 struct device_node *np = dev->of_node;
655 u32 prop;
656 struct max17042_platform_data *pdata;
657
658 if (!np)
659 return dev->platform_data;
660
661 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
662 if (!pdata)
663 return NULL;
664
665 /*
666 * Require current sense resistor value to be specified for
667 * current-sense functionality to be enabled at all.
668 */
669 if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
670 pdata->r_sns = prop;
671 pdata->enable_current_sense = true;
672 }
673
674 return pdata;
675}
676#else
677static struct max17042_platform_data *
678max17042_get_pdata(struct device *dev)
679{
680 return dev->platform_data;
681}
682#endif
683
359ab9f5
MH		 684static int __devinit max17042_probe(struct i2c_client *client,
685 const struct i2c_device_id *id)
686{
687 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
688 struct max17042_chip *chip;
689 int ret;
f3a71a6e 690 int reg;
359ab9f5
MH		 691
692 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
693 return -EIO;
694
2f3b4342 695 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
359ab9f5
MH		 696 if (!chip)
697 return -ENOMEM;
698
699 chip->client = client;
3832246d
KL		 700 chip->pdata = max17042_get_pdata(&client->dev);
701 if (!chip->pdata) {
702 dev_err(&client->dev, "no platform data provided\n");
703 return -EINVAL;
704 }
359ab9f5
MH		 705
706 i2c_set_clientdata(client, chip);
707
9a8422d2
RP		 708 ret = max17042_read_reg(chip->client, MAX17042_DevName);
709 if (ret == MAX17042_IC_VERSION) {
710 dev_dbg(&client->dev, "chip type max17042 detected\n");
711 chip->chip_type = MAX17042;
712 } else if (ret == MAX17047_IC_VERSION) {
713 dev_dbg(&client->dev, "chip type max17047/50 detected\n");
714 chip->chip_type = MAX17047;
715 } else {
716 dev_err(&client->dev, "device version mismatch: %x\n", ret);
717 return -EIO;
718 }
719
720 chip->battery.name = "max170xx_battery";
359ab9f5
MH		 721 chip->battery.type = POWER_SUPPLY_TYPE_BATTERY;
722 chip->battery.get_property = max17042_get_property;
723 chip->battery.properties = max17042_battery_props;
724 chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props);
725
086ef502
DK		 726 /* When current is not measured,
727 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
728 if (!chip->pdata->enable_current_sense)
729 chip->battery.num_properties -= 2;
730
4cfa892c
PR		 731 if (chip->pdata->r_sns == 0)
732 chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
733
086ef502
DK		 734 if (chip->pdata->init_data)
735 max17042_set_reg(client, chip->pdata->init_data,
f3a71a6e 736 chip->pdata->num_init_data);
086ef502 737
359ab9f5
MH		 738 if (!chip->pdata->enable_current_sense) {
739 max17042_write_reg(client, MAX17042_CGAIN, 0x0000);
740 max17042_write_reg(client, MAX17042_MiscCFG, 0x0003);
741 max17042_write_reg(client, MAX17042_LearnCFG, 0x0007);
742 }
743
243e3527
RP		 744 ret = power_supply_register(&client->dev, &chip->battery);
745 if (ret) {
746 dev_err(&client->dev, "failed: power supply register\n");
747 return ret;
748 }
749
e5f3872d 750 if (client->irq) {
5cdd4d7f 751 ret = request_threaded_irq(client->irq, NULL,
e5f3872d 752 max17042_thread_handler,
5cdd4d7f
RP		 753 IRQF_TRIGGER_FALLING,
754 chip->battery.name, chip);
e5f3872d
RP		 755 if (!ret) {
756 reg = max17042_read_reg(client, MAX17042_CONFIG);
757 reg |= CONFIG_ALRT_BIT_ENBL;
758 max17042_write_reg(client, MAX17042_CONFIG, reg);
759 max17042_set_soc_threshold(chip, 1);
e5ba50bc
RP		 760 } else {
761 client->irq = 0;
e5f3872d
RP		 762 dev_err(&client->dev, "%s(): cannot get IRQ\n",
763 __func__);
e5ba50bc 764 }
e5f3872d
RP		 765 }
766
f3a71a6e 767 reg = max17042_read_reg(chip->client, MAX17042_STATUS);
f3a71a6e
RP		 768 if (reg & STATUS_POR_BIT) {
769 INIT_WORK(&chip->work, max17042_init_worker);
770 schedule_work(&chip->work);
771 } else {
772 chip->init_complete = 1;
773 }
774
243e3527 775 return 0;
359ab9f5
MH		 776}
777
778static int __devexit max17042_remove(struct i2c_client *client)
779{
780 struct max17042_chip *chip = i2c_get_clientdata(client);
781
bb28da90
RP		 782 if (client->irq)
783 free_irq(client->irq, chip);
359ab9f5 784 power_supply_unregister(&chip->battery);
359ab9f5
MH		 785 return 0;
786}
787
48bc1774
RP		 788#ifdef CONFIG_PM
789static int max17042_suspend(struct device *dev)
790{
791 struct max17042_chip *chip = dev_get_drvdata(dev);
792
48e41c70
AV		 793 /*
794 * disable the irq and enable irq_wake
48bc1774
RP		 795 * capability to the interrupt line.
796 */
797 if (chip->client->irq) {
798 disable_irq(chip->client->irq);
799 enable_irq_wake(chip->client->irq);
800 }
801
802 return 0;
803}
804
805static int max17042_resume(struct device *dev)
806{
807 struct max17042_chip *chip = dev_get_drvdata(dev);
808
809 if (chip->client->irq) {
810 disable_irq_wake(chip->client->irq);
811 enable_irq(chip->client->irq);
812 /* re-program the SOC thresholds to 1% change */
813 max17042_set_soc_threshold(chip, 1);
814 }
815
816 return 0;
817}
48e41c70
AV		 818
819static const struct dev_pm_ops max17042_pm_ops = {
820 .suspend = max17042_suspend,
821 .resume = max17042_resume,
822};
823
824#define MAX17042_PM_OPS (&max17042_pm_ops)
48bc1774 825#else
48e41c70 826#define MAX17042_PM_OPS NULL
48bc1774
RP		 827#endif
828
3832246d
KL		 829#ifdef CONFIG_OF
830static const struct of_device_id max17042_dt_match[] = {
831 { .compatible = "maxim,max17042" },
9a8422d2
RP		 832 { .compatible = "maxim,max17047" },
833 { .compatible = "maxim,max17050" },
3832246d
KL		 834 { },
835};
836MODULE_DEVICE_TABLE(of, max17042_dt_match);
837#endif
838
359ab9f5
MH		 839static const struct i2c_device_id max17042_id[] = {
840 { "max17042", 0 },
9a8422d2
RP		 841 { "max17047", 1 },
842 { "max17050", 2 },
359ab9f5
MH		 843 { }
844};
845MODULE_DEVICE_TABLE(i2c, max17042_id);
846
847static struct i2c_driver max17042_i2c_driver = {
848 .driver = {
849 .name = "max17042",
3832246d 850 .of_match_table = of_match_ptr(max17042_dt_match),
48e41c70 851 .pm = MAX17042_PM_OPS,
359ab9f5
MH		 852 },
853 .probe = max17042_probe,
854 .remove = __devexit_p(max17042_remove),
855 .id_table = max17042_id,
856};
5ff92e7a 857module_i2c_driver(max17042_i2c_driver);
359ab9f5
MH		 858
859MODULE_AUTHOR("MyungJoo Ham <[email protected]>");
860MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
861MODULE_LICENSE("GPL");
Empty description
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