?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'for-linus' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / power / supply / bq25890_charger.c
blob8e2c41ded171cebe0946cb3cbca219e992a32ac8
1 /*
2 * TI BQ25890 charger driver
3 *
4 * Copyright (C) 2015 Intel Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 */
17
18 #include <linux/module.h>
19 #include <linux/i2c.h>
20 #include <linux/power_supply.h>
21 #include <linux/regmap.h>
22 #include <linux/types.h>
23 #include <linux/gpio/consumer.h>
24 #include <linux/interrupt.h>
25 #include <linux/delay.h>
26 #include <linux/usb/phy.h>
27
28 #include <linux/acpi.h>
29 #include <linux/of.h>
30
31 #define BQ25890_MANUFACTURER "Texas Instruments"
32 #define BQ25890_IRQ_PIN "bq25890_irq"
33
34 #define BQ25890_ID 3
35
36 enum bq25890_fields {
37 F_EN_HIZ, F_EN_ILIM, F_IILIM, /* Reg00 */
38 F_BHOT, F_BCOLD, F_VINDPM_OFS, /* Reg01 */
39 F_CONV_START, F_CONV_RATE, F_BOOSTF, F_ICO_EN,
40 F_HVDCP_EN, F_MAXC_EN, F_FORCE_DPM, F_AUTO_DPDM_EN, /* Reg02 */
41 F_BAT_LOAD_EN, F_WD_RST, F_OTG_CFG, F_CHG_CFG, F_SYSVMIN, /* Reg03 */
42 F_PUMPX_EN, F_ICHG, /* Reg04 */
43 F_IPRECHG, F_ITERM, /* Reg05 */
44 F_VREG, F_BATLOWV, F_VRECHG, /* Reg06 */
45 F_TERM_EN, F_STAT_DIS, F_WD, F_TMR_EN, F_CHG_TMR,
46 F_JEITA_ISET, /* Reg07 */
47 F_BATCMP, F_VCLAMP, F_TREG, /* Reg08 */
48 F_FORCE_ICO, F_TMR2X_EN, F_BATFET_DIS, F_JEITA_VSET,
49 F_BATFET_DLY, F_BATFET_RST_EN, F_PUMPX_UP, F_PUMPX_DN, /* Reg09 */
50 F_BOOSTV, F_BOOSTI, /* Reg0A */
51 F_VBUS_STAT, F_CHG_STAT, F_PG_STAT, F_SDP_STAT, F_VSYS_STAT, /* Reg0B */
52 F_WD_FAULT, F_BOOST_FAULT, F_CHG_FAULT, F_BAT_FAULT,
53 F_NTC_FAULT, /* Reg0C */
54 F_FORCE_VINDPM, F_VINDPM, /* Reg0D */
55 F_THERM_STAT, F_BATV, /* Reg0E */
56 F_SYSV, /* Reg0F */
57 F_TSPCT, /* Reg10 */
58 F_VBUS_GD, F_VBUSV, /* Reg11 */
59 F_ICHGR, /* Reg12 */
60 F_VDPM_STAT, F_IDPM_STAT, F_IDPM_LIM, /* Reg13 */
61 F_REG_RST, F_ICO_OPTIMIZED, F_PN, F_TS_PROFILE, F_DEV_REV, /* Reg14 */
62
63 F_MAX_FIELDS
64 };
65
66 /* initial field values, converted to register values */
67 struct bq25890_init_data {
68 u8 ichg; /* charge current */
69 u8 vreg; /* regulation voltage */
70 u8 iterm; /* termination current */
71 u8 iprechg; /* precharge current */
72 u8 sysvmin; /* minimum system voltage limit */
73 u8 boostv; /* boost regulation voltage */
74 u8 boosti; /* boost current limit */
75 u8 boostf; /* boost frequency */
76 u8 ilim_en; /* enable ILIM pin */
77 u8 treg; /* thermal regulation threshold */
78 };
79
80 struct bq25890_state {
81 u8 online;
82 u8 chrg_status;
83 u8 chrg_fault;
84 u8 vsys_status;
85 u8 boost_fault;
86 u8 bat_fault;
87 };
88
89 struct bq25890_device {
90 struct i2c_client *client;
91 struct device *dev;
92 struct power_supply *charger;
93
94 struct usb_phy *usb_phy;
95 struct notifier_block usb_nb;
96 struct work_struct usb_work;
97 unsigned long usb_event;
98
99 struct regmap *rmap;
100 struct regmap_field *rmap_fields[F_MAX_FIELDS];
101
102 int chip_id;
103 struct bq25890_init_data init_data;
104 struct bq25890_state state;
105
106 struct mutex lock; /* protect state data */
107 };
108
109 static const struct regmap_range bq25890_readonly_reg_ranges[] = {
110 regmap_reg_range(0x0b, 0x0c),
111 regmap_reg_range(0x0e, 0x13),
112 };
113
114 static const struct regmap_access_table bq25890_writeable_regs = {
115 .no_ranges = bq25890_readonly_reg_ranges,
116 .n_no_ranges = ARRAY_SIZE(bq25890_readonly_reg_ranges),
117 };
118
119 static const struct regmap_range bq25890_volatile_reg_ranges[] = {
120 regmap_reg_range(0x00, 0x00),
121 regmap_reg_range(0x09, 0x09),
122 regmap_reg_range(0x0b, 0x0c),
123 regmap_reg_range(0x0e, 0x14),
124 };
125
126 static const struct regmap_access_table bq25890_volatile_regs = {
127 .yes_ranges = bq25890_volatile_reg_ranges,
128 .n_yes_ranges = ARRAY_SIZE(bq25890_volatile_reg_ranges),
129 };
130
131 static const struct regmap_config bq25890_regmap_config = {
132 .reg_bits = 8,
133 .val_bits = 8,
134
135 .max_register = 0x14,
136 .cache_type = REGCACHE_RBTREE,
137
138 .wr_table = &bq25890_writeable_regs,
139 .volatile_table = &bq25890_volatile_regs,
140 };
141
142 static const struct reg_field bq25890_reg_fields[] = {
143 /* REG00 */
144 [F_EN_HIZ] = REG_FIELD(0x00, 7, 7),
145 [F_EN_ILIM] = REG_FIELD(0x00, 6, 6),
146 [F_IILIM] = REG_FIELD(0x00, 0, 5),
147 /* REG01 */
148 [F_BHOT] = REG_FIELD(0x01, 6, 7),
149 [F_BCOLD] = REG_FIELD(0x01, 5, 5),
150 [F_VINDPM_OFS] = REG_FIELD(0x01, 0, 4),
151 /* REG02 */
152 [F_CONV_START] = REG_FIELD(0x02, 7, 7),
153 [F_CONV_RATE] = REG_FIELD(0x02, 6, 6),
154 [F_BOOSTF] = REG_FIELD(0x02, 5, 5),
155 [F_ICO_EN] = REG_FIELD(0x02, 4, 4),
156 [F_HVDCP_EN] = REG_FIELD(0x02, 3, 3),
157 [F_MAXC_EN] = REG_FIELD(0x02, 2, 2),
158 [F_FORCE_DPM] = REG_FIELD(0x02, 1, 1),
159 [F_AUTO_DPDM_EN] = REG_FIELD(0x02, 0, 0),
160 /* REG03 */
161 [F_BAT_LOAD_EN] = REG_FIELD(0x03, 7, 7),
162 [F_WD_RST] = REG_FIELD(0x03, 6, 6),
163 [F_OTG_CFG] = REG_FIELD(0x03, 5, 5),
164 [F_CHG_CFG] = REG_FIELD(0x03, 4, 4),
165 [F_SYSVMIN] = REG_FIELD(0x03, 1, 3),
166 /* REG04 */
167 [F_PUMPX_EN] = REG_FIELD(0x04, 7, 7),
168 [F_ICHG] = REG_FIELD(0x04, 0, 6),
169 /* REG05 */
170 [F_IPRECHG] = REG_FIELD(0x05, 4, 7),
171 [F_ITERM] = REG_FIELD(0x05, 0, 3),
172 /* REG06 */
173 [F_VREG] = REG_FIELD(0x06, 2, 7),
174 [F_BATLOWV] = REG_FIELD(0x06, 1, 1),
175 [F_VRECHG] = REG_FIELD(0x06, 0, 0),
176 /* REG07 */
177 [F_TERM_EN] = REG_FIELD(0x07, 7, 7),
178 [F_STAT_DIS] = REG_FIELD(0x07, 6, 6),
179 [F_WD] = REG_FIELD(0x07, 4, 5),
180 [F_TMR_EN] = REG_FIELD(0x07, 3, 3),
181 [F_CHG_TMR] = REG_FIELD(0x07, 1, 2),
182 [F_JEITA_ISET] = REG_FIELD(0x07, 0, 0),
183 /* REG08 */
184 [F_BATCMP] = REG_FIELD(0x08, 6, 7),
185 [F_VCLAMP] = REG_FIELD(0x08, 2, 4),
186 [F_TREG] = REG_FIELD(0x08, 0, 1),
187 /* REG09 */
188 [F_FORCE_ICO] = REG_FIELD(0x09, 7, 7),
189 [F_TMR2X_EN] = REG_FIELD(0x09, 6, 6),
190 [F_BATFET_DIS] = REG_FIELD(0x09, 5, 5),
191 [F_JEITA_VSET] = REG_FIELD(0x09, 4, 4),
192 [F_BATFET_DLY] = REG_FIELD(0x09, 3, 3),
193 [F_BATFET_RST_EN] = REG_FIELD(0x09, 2, 2),
194 [F_PUMPX_UP] = REG_FIELD(0x09, 1, 1),
195 [F_PUMPX_DN] = REG_FIELD(0x09, 0, 0),
196 /* REG0A */
197 [F_BOOSTV] = REG_FIELD(0x0A, 4, 7),
198 [F_BOOSTI] = REG_FIELD(0x0A, 0, 2),
199 /* REG0B */
200 [F_VBUS_STAT] = REG_FIELD(0x0B, 5, 7),
201 [F_CHG_STAT] = REG_FIELD(0x0B, 3, 4),
202 [F_PG_STAT] = REG_FIELD(0x0B, 2, 2),
203 [F_SDP_STAT] = REG_FIELD(0x0B, 1, 1),
204 [F_VSYS_STAT] = REG_FIELD(0x0B, 0, 0),
205 /* REG0C */
206 [F_WD_FAULT] = REG_FIELD(0x0C, 7, 7),
207 [F_BOOST_FAULT] = REG_FIELD(0x0C, 6, 6),
208 [F_CHG_FAULT] = REG_FIELD(0x0C, 4, 5),
209 [F_BAT_FAULT] = REG_FIELD(0x0C, 3, 3),
210 [F_NTC_FAULT] = REG_FIELD(0x0C, 0, 2),
211 /* REG0D */
212 [F_FORCE_VINDPM] = REG_FIELD(0x0D, 7, 7),
213 [F_VINDPM] = REG_FIELD(0x0D, 0, 6),
214 /* REG0E */
215 [F_THERM_STAT] = REG_FIELD(0x0E, 7, 7),
216 [F_BATV] = REG_FIELD(0x0E, 0, 6),
217 /* REG0F */
218 [F_SYSV] = REG_FIELD(0x0F, 0, 6),
219 /* REG10 */
220 [F_TSPCT] = REG_FIELD(0x10, 0, 6),
221 /* REG11 */
222 [F_VBUS_GD] = REG_FIELD(0x11, 7, 7),
223 [F_VBUSV] = REG_FIELD(0x11, 0, 6),
224 /* REG12 */
225 [F_ICHGR] = REG_FIELD(0x12, 0, 6),
226 /* REG13 */
227 [F_VDPM_STAT] = REG_FIELD(0x13, 7, 7),
228 [F_IDPM_STAT] = REG_FIELD(0x13, 6, 6),
229 [F_IDPM_LIM] = REG_FIELD(0x13, 0, 5),
230 /* REG14 */
231 [F_REG_RST] = REG_FIELD(0x14, 7, 7),
232 [F_ICO_OPTIMIZED] = REG_FIELD(0x14, 6, 6),
233 [F_PN] = REG_FIELD(0x14, 3, 5),
234 [F_TS_PROFILE] = REG_FIELD(0x14, 2, 2),
235 [F_DEV_REV] = REG_FIELD(0x14, 0, 1)
236 };
237
238 /*
239 * Most of the val -> idx conversions can be computed, given the minimum,
240 * maximum and the step between values. For the rest of conversions, we use
241 * lookup tables.
242 */
243 enum bq25890_table_ids {
244 /* range tables */
245 TBL_ICHG,
246 TBL_ITERM,
247 TBL_IPRECHG,
248 TBL_VREG,
249 TBL_BATCMP,
250 TBL_VCLAMP,
251 TBL_BOOSTV,
252 TBL_SYSVMIN,
253
254 /* lookup tables */
255 TBL_TREG,
256 TBL_BOOSTI,
257 };
258
259 /* Thermal Regulation Threshold lookup table, in degrees Celsius */
260 static const u32 bq25890_treg_tbl[] = { 60, 80, 100, 120 };
261
262 #define BQ25890_TREG_TBL_SIZE ARRAY_SIZE(bq25890_treg_tbl)
263
264 /* Boost mode current limit lookup table, in uA */
265 static const u32 bq25890_boosti_tbl[] = {
266 500000, 700000, 1100000, 1300000, 1600000, 1800000, 2100000, 2400000
267 };
268
269 #define BQ25890_BOOSTI_TBL_SIZE ARRAY_SIZE(bq25890_boosti_tbl)
270
271 struct bq25890_range {
272 u32 min;
273 u32 max;
274 u32 step;
275 };
276
277 struct bq25890_lookup {
278 const u32 *tbl;
279 u32 size;
280 };
281
282 static const union {
283 struct bq25890_range rt;
284 struct bq25890_lookup lt;
285 } bq25890_tables[] = {
286 /* range tables */
287 [TBL_ICHG] = { .rt = {0, 5056000, 64000} }, /* uA */
288 [TBL_ITERM] = { .rt = {64000, 1024000, 64000} }, /* uA */
289 [TBL_VREG] = { .rt = {3840000, 4608000, 16000} }, /* uV */
290 [TBL_BATCMP] = { .rt = {0, 140, 20} }, /* mOhm */
291 [TBL_VCLAMP] = { .rt = {0, 224000, 32000} }, /* uV */
292 [TBL_BOOSTV] = { .rt = {4550000, 5510000, 64000} }, /* uV */
293 [TBL_SYSVMIN] = { .rt = {3000000, 3700000, 100000} }, /* uV */
294
295 /* lookup tables */
296 [TBL_TREG] = { .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} },
297 [TBL_BOOSTI] = { .lt = {bq25890_boosti_tbl, BQ25890_BOOSTI_TBL_SIZE} }
298 };
299
300 static int bq25890_field_read(struct bq25890_device *bq,
301 enum bq25890_fields field_id)
302 {
303 int ret;
304 int val;
305
306 ret = regmap_field_read(bq->rmap_fields[field_id], &val);
307 if (ret < 0)
308 return ret;
309
310 return val;
311 }
312
313 static int bq25890_field_write(struct bq25890_device *bq,
314 enum bq25890_fields field_id, u8 val)
315 {
316 return regmap_field_write(bq->rmap_fields[field_id], val);
317 }
318
319 static u8 bq25890_find_idx(u32 value, enum bq25890_table_ids id)
320 {
321 u8 idx;
322
323 if (id >= TBL_TREG) {
324 const u32 *tbl = bq25890_tables[id].lt.tbl;
325 u32 tbl_size = bq25890_tables[id].lt.size;
326
327 for (idx = 1; idx < tbl_size && tbl[idx] <= value; idx++)
328 ;
329 } else {
330 const struct bq25890_range *rtbl = &bq25890_tables[id].rt;
331 u8 rtbl_size;
332
333 rtbl_size = (rtbl->max - rtbl->min) / rtbl->step + 1;
334
335 for (idx = 1;
336 idx < rtbl_size && (idx * rtbl->step + rtbl->min <= value);
337 idx++)
338 ;
339 }
340
341 return idx - 1;
342 }
343
344 static u32 bq25890_find_val(u8 idx, enum bq25890_table_ids id)
345 {
346 const struct bq25890_range *rtbl;
347
348 /* lookup table? */
349 if (id >= TBL_TREG)
350 return bq25890_tables[id].lt.tbl[idx];
351
352 /* range table */
353 rtbl = &bq25890_tables[id].rt;
354
355 return (rtbl->min + idx * rtbl->step);
356 }
357
358 enum bq25890_status {
359 STATUS_NOT_CHARGING,
360 STATUS_PRE_CHARGING,
361 STATUS_FAST_CHARGING,
362 STATUS_TERMINATION_DONE,
363 };
364
365 enum bq25890_chrg_fault {
366 CHRG_FAULT_NORMAL,
367 CHRG_FAULT_INPUT,
368 CHRG_FAULT_THERMAL_SHUTDOWN,
369 CHRG_FAULT_TIMER_EXPIRED,
370 };
371
372 static int bq25890_power_supply_get_property(struct power_supply *psy,
373 enum power_supply_property psp,
374 union power_supply_propval *val)
375 {
376 int ret;
377 struct bq25890_device *bq = power_supply_get_drvdata(psy);
378 struct bq25890_state state;
379
380 mutex_lock(&bq->lock);
381 state = bq->state;
382 mutex_unlock(&bq->lock);
383
384 switch (psp) {
385 case POWER_SUPPLY_PROP_STATUS:
386 if (!state.online)
387 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
388 else if (state.chrg_status == STATUS_NOT_CHARGING)
389 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
390 else if (state.chrg_status == STATUS_PRE_CHARGING ||
391 state.chrg_status == STATUS_FAST_CHARGING)
392 val->intval = POWER_SUPPLY_STATUS_CHARGING;
393 else if (state.chrg_status == STATUS_TERMINATION_DONE)
394 val->intval = POWER_SUPPLY_STATUS_FULL;
395 else
396 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
397
398 break;
399
400 case POWER_SUPPLY_PROP_MANUFACTURER:
401 val->strval = BQ25890_MANUFACTURER;
402 break;
403
404 case POWER_SUPPLY_PROP_ONLINE:
405 val->intval = state.online;
406 break;
407
408 case POWER_SUPPLY_PROP_HEALTH:
409 if (!state.chrg_fault && !state.bat_fault && !state.boost_fault)
410 val->intval = POWER_SUPPLY_HEALTH_GOOD;
411 else if (state.bat_fault)
412 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
413 else if (state.chrg_fault == CHRG_FAULT_TIMER_EXPIRED)
414 val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
415 else if (state.chrg_fault == CHRG_FAULT_THERMAL_SHUTDOWN)
416 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
417 else
418 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
419 break;
420
421 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
422 ret = bq25890_field_read(bq, F_ICHGR); /* read measured value */
423 if (ret < 0)
424 return ret;
425
426 /* converted_val = ADC_val * 50mA (table 10.3.19) */
427 val->intval = ret * 50000;
428 break;
429
430 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
431 val->intval = bq25890_tables[TBL_ICHG].rt.max;
432 break;
433
434 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
435 if (!state.online) {
436 val->intval = 0;
437 break;
438 }
439
440 ret = bq25890_field_read(bq, F_BATV); /* read measured value */
441 if (ret < 0)
442 return ret;
443
444 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
445 val->intval = 2304000 + ret * 20000;
446 break;
447
448 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
449 val->intval = bq25890_tables[TBL_VREG].rt.max;
450 break;
451
452 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
453 val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM);
454 break;
455
456 default:
457 return -EINVAL;
458 }
459
460 return 0;
461 }
462
463 static int bq25890_get_chip_state(struct bq25890_device *bq,
464 struct bq25890_state *state)
465 {
466 int i, ret;
467
468 struct {
469 enum bq25890_fields id;
470 u8 *data;
471 } state_fields[] = {
472 {F_CHG_STAT, &state->chrg_status},
473 {F_PG_STAT, &state->online},
474 {F_VSYS_STAT, &state->vsys_status},
475 {F_BOOST_FAULT, &state->boost_fault},
476 {F_BAT_FAULT, &state->bat_fault},
477 {F_CHG_FAULT, &state->chrg_fault}
478 };
479
480 for (i = 0; i < ARRAY_SIZE(state_fields); i++) {
481 ret = bq25890_field_read(bq, state_fields[i].id);
482 if (ret < 0)
483 return ret;
484
485 *state_fields[i].data = ret;
486 }
487
488 dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n",
489 state->chrg_status, state->online, state->vsys_status,
490 state->chrg_fault, state->boost_fault, state->bat_fault);
491
492 return 0;
493 }
494
495 static bool bq25890_state_changed(struct bq25890_device *bq,
496 struct bq25890_state *new_state)
497 {
498 struct bq25890_state old_state;
499
500 mutex_lock(&bq->lock);
501 old_state = bq->state;
502 mutex_unlock(&bq->lock);
503
504 return (old_state.chrg_status != new_state->chrg_status ||
505 old_state.chrg_fault != new_state->chrg_fault ||
506 old_state.online != new_state->online ||
507 old_state.bat_fault != new_state->bat_fault ||
508 old_state.boost_fault != new_state->boost_fault ||
509 old_state.vsys_status != new_state->vsys_status);
510 }
511
512 static void bq25890_handle_state_change(struct bq25890_device *bq,
513 struct bq25890_state *new_state)
514 {
515 int ret;
516 struct bq25890_state old_state;
517
518 mutex_lock(&bq->lock);
519 old_state = bq->state;
520 mutex_unlock(&bq->lock);
521
522 if (!new_state->online) { /* power removed */
523 /* disable ADC */
524 ret = bq25890_field_write(bq, F_CONV_START, 0);
525 if (ret < 0)
526 goto error;
527 } else if (!old_state.online) { /* power inserted */
528 /* enable ADC, to have control of charge current/voltage */
529 ret = bq25890_field_write(bq, F_CONV_START, 1);
530 if (ret < 0)
531 goto error;
532 }
533
534 return;
535
536 error:
537 dev_err(bq->dev, "Error communicating with the chip.\n");
538 }
539
540 static irqreturn_t bq25890_irq_handler_thread(int irq, void *private)
541 {
542 struct bq25890_device *bq = private;
543 int ret;
544 struct bq25890_state state;
545
546 ret = bq25890_get_chip_state(bq, &state);
547 if (ret < 0)
548 goto handled;
549
550 if (!bq25890_state_changed(bq, &state))
551 goto handled;
552
553 bq25890_handle_state_change(bq, &state);
554
555 mutex_lock(&bq->lock);
556 bq->state = state;
557 mutex_unlock(&bq->lock);
558
559 power_supply_changed(bq->charger);
560
561 handled:
562 return IRQ_HANDLED;
563 }
564
565 static int bq25890_chip_reset(struct bq25890_device *bq)
566 {
567 int ret;
568 int rst_check_counter = 10;
569
570 ret = bq25890_field_write(bq, F_REG_RST, 1);
571 if (ret < 0)
572 return ret;
573
574 do {
575 ret = bq25890_field_read(bq, F_REG_RST);
576 if (ret < 0)
577 return ret;
578
579 usleep_range(5, 10);
580 } while (ret == 1 && --rst_check_counter);
581
582 if (!rst_check_counter)
583 return -ETIMEDOUT;
584
585 return 0;
586 }
587
588 static int bq25890_hw_init(struct bq25890_device *bq)
589 {
590 int ret;
591 int i;
592 struct bq25890_state state;
593
594 const struct {
595 enum bq25890_fields id;
596 u32 value;
597 } init_data[] = {
598 {F_ICHG, bq->init_data.ichg},
599 {F_VREG, bq->init_data.vreg},
600 {F_ITERM, bq->init_data.iterm},
601 {F_IPRECHG, bq->init_data.iprechg},
602 {F_SYSVMIN, bq->init_data.sysvmin},
603 {F_BOOSTV, bq->init_data.boostv},
604 {F_BOOSTI, bq->init_data.boosti},
605 {F_BOOSTF, bq->init_data.boostf},
606 {F_EN_ILIM, bq->init_data.ilim_en},
607 {F_TREG, bq->init_data.treg}
608 };
609
610 ret = bq25890_chip_reset(bq);
611 if (ret < 0)
612 return ret;
613
614 /* disable watchdog */
615 ret = bq25890_field_write(bq, F_WD, 0);
616 if (ret < 0)
617 return ret;
618
619 /* initialize currents/voltages and other parameters */
620 for (i = 0; i < ARRAY_SIZE(init_data); i++) {
621 ret = bq25890_field_write(bq, init_data[i].id,
622 init_data[i].value);
623 if (ret < 0)
624 return ret;
625 }
626
627 /* Configure ADC for continuous conversions. This does not enable it. */
628 ret = bq25890_field_write(bq, F_CONV_RATE, 1);
629 if (ret < 0)
630 return ret;
631
632 ret = bq25890_get_chip_state(bq, &state);
633 if (ret < 0)
634 return ret;
635
636 mutex_lock(&bq->lock);
637 bq->state = state;
638 mutex_unlock(&bq->lock);
639
640 return 0;
641 }
642
643 static enum power_supply_property bq25890_power_supply_props[] = {
644 POWER_SUPPLY_PROP_MANUFACTURER,
645 POWER_SUPPLY_PROP_STATUS,
646 POWER_SUPPLY_PROP_ONLINE,
647 POWER_SUPPLY_PROP_HEALTH,
648 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
649 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
650 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
651 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
652 POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
653 };
654
655 static char *bq25890_charger_supplied_to[] = {
656 "main-battery",
657 };
658
659 static const struct power_supply_desc bq25890_power_supply_desc = {
660 .name = "bq25890-charger",
661 .type = POWER_SUPPLY_TYPE_USB,
662 .properties = bq25890_power_supply_props,
663 .num_properties = ARRAY_SIZE(bq25890_power_supply_props),
664 .get_property = bq25890_power_supply_get_property,
665 };
666
667 static int bq25890_power_supply_init(struct bq25890_device *bq)
668 {
669 struct power_supply_config psy_cfg = { .drv_data = bq, };
670
671 psy_cfg.supplied_to = bq25890_charger_supplied_to;
672 psy_cfg.num_supplicants = ARRAY_SIZE(bq25890_charger_supplied_to);
673
674 bq->charger = power_supply_register(bq->dev, &bq25890_power_supply_desc,
675 &psy_cfg);
676
677 return PTR_ERR_OR_ZERO(bq->charger);
678 }
679
680 static void bq25890_usb_work(struct work_struct *data)
681 {
682 int ret;
683 struct bq25890_device *bq =
684 container_of(data, struct bq25890_device, usb_work);
685
686 switch (bq->usb_event) {
687 case USB_EVENT_ID:
688 /* Enable boost mode */
689 ret = bq25890_field_write(bq, F_OTG_CFG, 1);
690 if (ret < 0)
691 goto error;
692 break;
693
694 case USB_EVENT_NONE:
695 /* Disable boost mode */
696 ret = bq25890_field_write(bq, F_OTG_CFG, 0);
697 if (ret < 0)
698 goto error;
699
700 power_supply_changed(bq->charger);
701 break;
702 }
703
704 return;
705
706 error:
707 dev_err(bq->dev, "Error switching to boost/charger mode.\n");
708 }
709
710 static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val,
711 void *priv)
712 {
713 struct bq25890_device *bq =
714 container_of(nb, struct bq25890_device, usb_nb);
715
716 bq->usb_event = val;
717 queue_work(system_power_efficient_wq, &bq->usb_work);
718
719 return NOTIFY_OK;
720 }
721
722 static int bq25890_irq_probe(struct bq25890_device *bq)
723 {
724 struct gpio_desc *irq;
725
726 irq = devm_gpiod_get(bq->dev, BQ25890_IRQ_PIN, GPIOD_IN);
727 if (IS_ERR(irq)) {
728 dev_err(bq->dev, "Could not probe irq pin.\n");
729 return PTR_ERR(irq);
730 }
731
732 return gpiod_to_irq(irq);
733 }
734
735 static int bq25890_fw_read_u32_props(struct bq25890_device *bq)
736 {
737 int ret;
738 u32 property;
739 int i;
740 struct bq25890_init_data *init = &bq->init_data;
741 struct {
742 char *name;
743 bool optional;
744 enum bq25890_table_ids tbl_id;
745 u8 *conv_data; /* holds converted value from given property */
746 } props[] = {
747 /* required properties */
748 {"ti,charge-current", false, TBL_ICHG, &init->ichg},
749 {"ti,battery-regulation-voltage", false, TBL_VREG, &init->vreg},
750 {"ti,termination-current", false, TBL_ITERM, &init->iterm},
751 {"ti,precharge-current", false, TBL_ITERM, &init->iprechg},
752 {"ti,minimum-sys-voltage", false, TBL_SYSVMIN, &init->sysvmin},
753 {"ti,boost-voltage", false, TBL_BOOSTV, &init->boostv},
754 {"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti},
755
756 /* optional properties */
757 {"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg}
758 };
759
760 /* initialize data for optional properties */
761 init->treg = 3; /* 120 degrees Celsius */
762
763 for (i = 0; i < ARRAY_SIZE(props); i++) {
764 ret = device_property_read_u32(bq->dev, props[i].name,
765 &property);
766 if (ret < 0) {
767 if (props[i].optional)
768 continue;
769
770 return ret;
771 }
772
773 *props[i].conv_data = bq25890_find_idx(property,
774 props[i].tbl_id);
775 }
776
777 return 0;
778 }
779
780 static int bq25890_fw_probe(struct bq25890_device *bq)
781 {
782 int ret;
783 struct bq25890_init_data *init = &bq->init_data;
784
785 ret = bq25890_fw_read_u32_props(bq);
786 if (ret < 0)
787 return ret;
788
789 init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin");
790 init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq");
791
792 return 0;
793 }
794
795 static int bq25890_probe(struct i2c_client *client,
796 const struct i2c_device_id *id)
797 {
798 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
799 struct device *dev = &client->dev;
800 struct bq25890_device *bq;
801 int ret;
802 int i;
803
804 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
805 dev_err(dev, "No support for SMBUS_BYTE_DATA\n");
806 return -ENODEV;
807 }
808
809 bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL);
810 if (!bq)
811 return -ENOMEM;
812
813 bq->client = client;
814 bq->dev = dev;
815
816 mutex_init(&bq->lock);
817
818 bq->rmap = devm_regmap_init_i2c(client, &bq25890_regmap_config);
819 if (IS_ERR(bq->rmap)) {
820 dev_err(dev, "failed to allocate register map\n");
821 return PTR_ERR(bq->rmap);
822 }
823
824 for (i = 0; i < ARRAY_SIZE(bq25890_reg_fields); i++) {
825 const struct reg_field *reg_fields = bq25890_reg_fields;
826
827 bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap,
828 reg_fields[i]);
829 if (IS_ERR(bq->rmap_fields[i])) {
830 dev_err(dev, "cannot allocate regmap field\n");
831 return PTR_ERR(bq->rmap_fields[i]);
832 }
833 }
834
835 i2c_set_clientdata(client, bq);
836
837 bq->chip_id = bq25890_field_read(bq, F_PN);
838 if (bq->chip_id < 0) {
839 dev_err(dev, "Cannot read chip ID.\n");
840 return bq->chip_id;
841 }
842
843 if (bq->chip_id != BQ25890_ID) {
844 dev_err(dev, "Chip with ID=%d, not supported!\n", bq->chip_id);
845 return -ENODEV;
846 }
847
848 if (!dev->platform_data) {
849 ret = bq25890_fw_probe(bq);
850 if (ret < 0) {
851 dev_err(dev, "Cannot read device properties.\n");
852 return ret;
853 }
854 } else {
855 return -ENODEV;
856 }
857
858 ret = bq25890_hw_init(bq);
859 if (ret < 0) {
860 dev_err(dev, "Cannot initialize the chip.\n");
861 return ret;
862 }
863
864 if (client->irq <= 0)
865 client->irq = bq25890_irq_probe(bq);
866
867 if (client->irq < 0) {
868 dev_err(dev, "No irq resource found.\n");
869 return client->irq;
870 }
871
872 /* OTG reporting */
873 bq->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
874 if (!IS_ERR_OR_NULL(bq->usb_phy)) {
875 INIT_WORK(&bq->usb_work, bq25890_usb_work);
876 bq->usb_nb.notifier_call = bq25890_usb_notifier;
877 usb_register_notifier(bq->usb_phy, &bq->usb_nb);
878 }
879
880 ret = devm_request_threaded_irq(dev, client->irq, NULL,
881 bq25890_irq_handler_thread,
882 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
883 BQ25890_IRQ_PIN, bq);
884 if (ret)
885 goto irq_fail;
886
887 ret = bq25890_power_supply_init(bq);
888 if (ret < 0) {
889 dev_err(dev, "Failed to register power supply\n");
890 goto irq_fail;
891 }
892
893 return 0;
894
895 irq_fail:
896 if (!IS_ERR_OR_NULL(bq->usb_phy))
897 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
898
899 return ret;
900 }
901
902 static int bq25890_remove(struct i2c_client *client)
903 {
904 struct bq25890_device *bq = i2c_get_clientdata(client);
905
906 power_supply_unregister(bq->charger);
907
908 if (!IS_ERR_OR_NULL(bq->usb_phy))
909 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
910
911 /* reset all registers to default values */
912 bq25890_chip_reset(bq);
913
914 return 0;
915 }
916
917 #ifdef CONFIG_PM_SLEEP
918 static int bq25890_suspend(struct device *dev)
919 {
920 struct bq25890_device *bq = dev_get_drvdata(dev);
921
922 /*
923 * If charger is removed, while in suspend, make sure ADC is diabled
924 * since it consumes slightly more power.
925 */
926 return bq25890_field_write(bq, F_CONV_START, 0);
927 }
928
929 static int bq25890_resume(struct device *dev)
930 {
931 int ret;
932 struct bq25890_state state;
933 struct bq25890_device *bq = dev_get_drvdata(dev);
934
935 ret = bq25890_get_chip_state(bq, &state);
936 if (ret < 0)
937 return ret;
938
939 mutex_lock(&bq->lock);
940 bq->state = state;
941 mutex_unlock(&bq->lock);
942
943 /* Re-enable ADC only if charger is plugged in. */
944 if (state.online) {
945 ret = bq25890_field_write(bq, F_CONV_START, 1);
946 if (ret < 0)
947 return ret;
948 }
949
950 /* signal userspace, maybe state changed while suspended */
951 power_supply_changed(bq->charger);
952
953 return 0;
954 }
955 #endif
956
957 static const struct dev_pm_ops bq25890_pm = {
958 SET_SYSTEM_SLEEP_PM_OPS(bq25890_suspend, bq25890_resume)
959 };
960
961 static const struct i2c_device_id bq25890_i2c_ids[] = {
962 { "bq25890", 0 },
963 {},
964 };
965 MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids);
966
967 static const struct of_device_id bq25890_of_match[] = {
968 { .compatible = "ti,bq25890", },
969 { },
970 };
971 MODULE_DEVICE_TABLE(of, bq25890_of_match);
972
973 static const struct acpi_device_id bq25890_acpi_match[] = {
974 {"BQ258900", 0},
975 {},
976 };
977 MODULE_DEVICE_TABLE(acpi, bq25890_acpi_match);
978
979 static struct i2c_driver bq25890_driver = {
980 .driver = {
981 .name = "bq25890-charger",
982 .of_match_table = of_match_ptr(bq25890_of_match),
983 .acpi_match_table = ACPI_PTR(bq25890_acpi_match),
984 .pm = &bq25890_pm,
985 },
986 .probe = bq25890_probe,
987 .remove = bq25890_remove,
988 .id_table = bq25890_i2c_ids,
989 };
990 module_i2c_driver(bq25890_driver);
991
992 MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>");
993 MODULE_DESCRIPTION("bq25890 charger driver");
994 MODULE_LICENSE("GPL");
Linux with added FPC-III support