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Merge tag 'ntb-5.1' of git://github.com/jonmason/ntb
[mirror_ubuntu-hirsute-kernel.git] / drivers / power / supply / bq25890_charger.c
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 #define BQ25896_ID 0
36
37 enum bq25890_fields {
38 F_EN_HIZ, F_EN_ILIM, F_IILIM, /* Reg00 */
39 F_BHOT, F_BCOLD, F_VINDPM_OFS, /* Reg01 */
40 F_CONV_START, F_CONV_RATE, F_BOOSTF, F_ICO_EN,
41 F_HVDCP_EN, F_MAXC_EN, F_FORCE_DPM, F_AUTO_DPDM_EN, /* Reg02 */
42 F_BAT_LOAD_EN, F_WD_RST, F_OTG_CFG, F_CHG_CFG, F_SYSVMIN, /* Reg03 */
43 F_PUMPX_EN, F_ICHG, /* Reg04 */
44 F_IPRECHG, F_ITERM, /* Reg05 */
45 F_VREG, F_BATLOWV, F_VRECHG, /* Reg06 */
46 F_TERM_EN, F_STAT_DIS, F_WD, F_TMR_EN, F_CHG_TMR,
47 F_JEITA_ISET, /* Reg07 */
48 F_BATCMP, F_VCLAMP, F_TREG, /* Reg08 */
49 F_FORCE_ICO, F_TMR2X_EN, F_BATFET_DIS, F_JEITA_VSET,
50 F_BATFET_DLY, F_BATFET_RST_EN, F_PUMPX_UP, F_PUMPX_DN, /* Reg09 */
51 F_BOOSTV, F_BOOSTI, /* Reg0A */
52 F_VBUS_STAT, F_CHG_STAT, F_PG_STAT, F_SDP_STAT, F_VSYS_STAT, /* Reg0B */
53 F_WD_FAULT, F_BOOST_FAULT, F_CHG_FAULT, F_BAT_FAULT,
54 F_NTC_FAULT, /* Reg0C */
55 F_FORCE_VINDPM, F_VINDPM, /* Reg0D */
56 F_THERM_STAT, F_BATV, /* Reg0E */
57 F_SYSV, /* Reg0F */
58 F_TSPCT, /* Reg10 */
59 F_VBUS_GD, F_VBUSV, /* Reg11 */
60 F_ICHGR, /* Reg12 */
61 F_VDPM_STAT, F_IDPM_STAT, F_IDPM_LIM, /* Reg13 */
62 F_REG_RST, F_ICO_OPTIMIZED, F_PN, F_TS_PROFILE, F_DEV_REV, /* Reg14 */
63
64 F_MAX_FIELDS
65 };
66
67 /* initial field values, converted to register values */
68 struct bq25890_init_data {
69 u8 ichg; /* charge current */
70 u8 vreg; /* regulation voltage */
71 u8 iterm; /* termination current */
72 u8 iprechg; /* precharge current */
73 u8 sysvmin; /* minimum system voltage limit */
74 u8 boostv; /* boost regulation voltage */
75 u8 boosti; /* boost current limit */
76 u8 boostf; /* boost frequency */
77 u8 ilim_en; /* enable ILIM pin */
78 u8 treg; /* thermal regulation threshold */
79 };
80
81 struct bq25890_state {
82 u8 online;
83 u8 chrg_status;
84 u8 chrg_fault;
85 u8 vsys_status;
86 u8 boost_fault;
87 u8 bat_fault;
88 };
89
90 struct bq25890_device {
91 struct i2c_client *client;
92 struct device *dev;
93 struct power_supply *charger;
94
95 struct usb_phy *usb_phy;
96 struct notifier_block usb_nb;
97 struct work_struct usb_work;
98 unsigned long usb_event;
99
100 struct regmap *rmap;
101 struct regmap_field *rmap_fields[F_MAX_FIELDS];
102
103 int chip_id;
104 struct bq25890_init_data init_data;
105 struct bq25890_state state;
106
107 struct mutex lock; /* protect state data */
108 };
109
110 static const struct regmap_range bq25890_readonly_reg_ranges[] = {
111 regmap_reg_range(0x0b, 0x0c),
112 regmap_reg_range(0x0e, 0x13),
113 };
114
115 static const struct regmap_access_table bq25890_writeable_regs = {
116 .no_ranges = bq25890_readonly_reg_ranges,
117 .n_no_ranges = ARRAY_SIZE(bq25890_readonly_reg_ranges),
118 };
119
120 static const struct regmap_range bq25890_volatile_reg_ranges[] = {
121 regmap_reg_range(0x00, 0x00),
122 regmap_reg_range(0x09, 0x09),
123 regmap_reg_range(0x0b, 0x0c),
124 regmap_reg_range(0x0e, 0x14),
125 };
126
127 static const struct regmap_access_table bq25890_volatile_regs = {
128 .yes_ranges = bq25890_volatile_reg_ranges,
129 .n_yes_ranges = ARRAY_SIZE(bq25890_volatile_reg_ranges),
130 };
131
132 static const struct regmap_config bq25890_regmap_config = {
133 .reg_bits = 8,
134 .val_bits = 8,
135
136 .max_register = 0x14,
137 .cache_type = REGCACHE_RBTREE,
138
139 .wr_table = &bq25890_writeable_regs,
140 .volatile_table = &bq25890_volatile_regs,
141 };
142
143 static const struct reg_field bq25890_reg_fields[] = {
144 /* REG00 */
145 [F_EN_HIZ] = REG_FIELD(0x00, 7, 7),
146 [F_EN_ILIM] = REG_FIELD(0x00, 6, 6),
147 [F_IILIM] = REG_FIELD(0x00, 0, 5),
148 /* REG01 */
149 [F_BHOT] = REG_FIELD(0x01, 6, 7),
150 [F_BCOLD] = REG_FIELD(0x01, 5, 5),
151 [F_VINDPM_OFS] = REG_FIELD(0x01, 0, 4),
152 /* REG02 */
153 [F_CONV_START] = REG_FIELD(0x02, 7, 7),
154 [F_CONV_RATE] = REG_FIELD(0x02, 6, 6),
155 [F_BOOSTF] = REG_FIELD(0x02, 5, 5),
156 [F_ICO_EN] = REG_FIELD(0x02, 4, 4),
157 [F_HVDCP_EN] = REG_FIELD(0x02, 3, 3), // reserved on BQ25896
158 [F_MAXC_EN] = REG_FIELD(0x02, 2, 2), // reserved on BQ25896
159 [F_FORCE_DPM] = REG_FIELD(0x02, 1, 1),
160 [F_AUTO_DPDM_EN] = REG_FIELD(0x02, 0, 0),
161 /* REG03 */
162 [F_BAT_LOAD_EN] = REG_FIELD(0x03, 7, 7),
163 [F_WD_RST] = REG_FIELD(0x03, 6, 6),
164 [F_OTG_CFG] = REG_FIELD(0x03, 5, 5),
165 [F_CHG_CFG] = REG_FIELD(0x03, 4, 4),
166 [F_SYSVMIN] = REG_FIELD(0x03, 1, 3),
167 /* MIN_VBAT_SEL on BQ25896 */
168 /* REG04 */
169 [F_PUMPX_EN] = REG_FIELD(0x04, 7, 7),
170 [F_ICHG] = REG_FIELD(0x04, 0, 6),
171 /* REG05 */
172 [F_IPRECHG] = REG_FIELD(0x05, 4, 7),
173 [F_ITERM] = REG_FIELD(0x05, 0, 3),
174 /* REG06 */
175 [F_VREG] = REG_FIELD(0x06, 2, 7),
176 [F_BATLOWV] = REG_FIELD(0x06, 1, 1),
177 [F_VRECHG] = REG_FIELD(0x06, 0, 0),
178 /* REG07 */
179 [F_TERM_EN] = REG_FIELD(0x07, 7, 7),
180 [F_STAT_DIS] = REG_FIELD(0x07, 6, 6),
181 [F_WD] = REG_FIELD(0x07, 4, 5),
182 [F_TMR_EN] = REG_FIELD(0x07, 3, 3),
183 [F_CHG_TMR] = REG_FIELD(0x07, 1, 2),
184 [F_JEITA_ISET] = REG_FIELD(0x07, 0, 0),
185 /* REG08 */
186 [F_BATCMP] = REG_FIELD(0x08, 5, 7),
187 [F_VCLAMP] = REG_FIELD(0x08, 2, 4),
188 [F_TREG] = REG_FIELD(0x08, 0, 1),
189 /* REG09 */
190 [F_FORCE_ICO] = REG_FIELD(0x09, 7, 7),
191 [F_TMR2X_EN] = REG_FIELD(0x09, 6, 6),
192 [F_BATFET_DIS] = REG_FIELD(0x09, 5, 5),
193 [F_JEITA_VSET] = REG_FIELD(0x09, 4, 4),
194 [F_BATFET_DLY] = REG_FIELD(0x09, 3, 3),
195 [F_BATFET_RST_EN] = REG_FIELD(0x09, 2, 2),
196 [F_PUMPX_UP] = REG_FIELD(0x09, 1, 1),
197 [F_PUMPX_DN] = REG_FIELD(0x09, 0, 0),
198 /* REG0A */
199 [F_BOOSTV] = REG_FIELD(0x0A, 4, 7),
200 /* PFM_OTG_DIS 3 on BQ25896 */
201 [F_BOOSTI] = REG_FIELD(0x0A, 0, 2),
202 /* REG0B */
203 [F_VBUS_STAT] = REG_FIELD(0x0B, 5, 7),
204 [F_CHG_STAT] = REG_FIELD(0x0B, 3, 4),
205 [F_PG_STAT] = REG_FIELD(0x0B, 2, 2),
206 [F_SDP_STAT] = REG_FIELD(0x0B, 1, 1), // reserved on BQ25896
207 [F_VSYS_STAT] = REG_FIELD(0x0B, 0, 0),
208 /* REG0C */
209 [F_WD_FAULT] = REG_FIELD(0x0C, 7, 7),
210 [F_BOOST_FAULT] = REG_FIELD(0x0C, 6, 6),
211 [F_CHG_FAULT] = REG_FIELD(0x0C, 4, 5),
212 [F_BAT_FAULT] = REG_FIELD(0x0C, 3, 3),
213 [F_NTC_FAULT] = REG_FIELD(0x0C, 0, 2),
214 /* REG0D */
215 [F_FORCE_VINDPM] = REG_FIELD(0x0D, 7, 7),
216 [F_VINDPM] = REG_FIELD(0x0D, 0, 6),
217 /* REG0E */
218 [F_THERM_STAT] = REG_FIELD(0x0E, 7, 7),
219 [F_BATV] = REG_FIELD(0x0E, 0, 6),
220 /* REG0F */
221 [F_SYSV] = REG_FIELD(0x0F, 0, 6),
222 /* REG10 */
223 [F_TSPCT] = REG_FIELD(0x10, 0, 6),
224 /* REG11 */
225 [F_VBUS_GD] = REG_FIELD(0x11, 7, 7),
226 [F_VBUSV] = REG_FIELD(0x11, 0, 6),
227 /* REG12 */
228 [F_ICHGR] = REG_FIELD(0x12, 0, 6),
229 /* REG13 */
230 [F_VDPM_STAT] = REG_FIELD(0x13, 7, 7),
231 [F_IDPM_STAT] = REG_FIELD(0x13, 6, 6),
232 [F_IDPM_LIM] = REG_FIELD(0x13, 0, 5),
233 /* REG14 */
234 [F_REG_RST] = REG_FIELD(0x14, 7, 7),
235 [F_ICO_OPTIMIZED] = REG_FIELD(0x14, 6, 6),
236 [F_PN] = REG_FIELD(0x14, 3, 5),
237 [F_TS_PROFILE] = REG_FIELD(0x14, 2, 2),
238 [F_DEV_REV] = REG_FIELD(0x14, 0, 1)
239 };
240
241 /*
242 * Most of the val -> idx conversions can be computed, given the minimum,
243 * maximum and the step between values. For the rest of conversions, we use
244 * lookup tables.
245 */
246 enum bq25890_table_ids {
247 /* range tables */
248 TBL_ICHG,
249 TBL_ITERM,
250 TBL_VREG,
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_BOOSTV] = { .rt = {4550000, 5510000, 64000} }, /* uV */
291 [TBL_SYSVMIN] = { .rt = {3000000, 3700000, 100000} }, /* uV */
292
293 /* lookup tables */
294 [TBL_TREG] = { .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} },
295 [TBL_BOOSTI] = { .lt = {bq25890_boosti_tbl, BQ25890_BOOSTI_TBL_SIZE} }
296 };
297
298 static int bq25890_field_read(struct bq25890_device *bq,
299 enum bq25890_fields field_id)
300 {
301 int ret;
302 int val;
303
304 ret = regmap_field_read(bq->rmap_fields[field_id], &val);
305 if (ret < 0)
306 return ret;
307
308 return val;
309 }
310
311 static int bq25890_field_write(struct bq25890_device *bq,
312 enum bq25890_fields field_id, u8 val)
313 {
314 return regmap_field_write(bq->rmap_fields[field_id], val);
315 }
316
317 static u8 bq25890_find_idx(u32 value, enum bq25890_table_ids id)
318 {
319 u8 idx;
320
321 if (id >= TBL_TREG) {
322 const u32 *tbl = bq25890_tables[id].lt.tbl;
323 u32 tbl_size = bq25890_tables[id].lt.size;
324
325 for (idx = 1; idx < tbl_size && tbl[idx] <= value; idx++)
326 ;
327 } else {
328 const struct bq25890_range *rtbl = &bq25890_tables[id].rt;
329 u8 rtbl_size;
330
331 rtbl_size = (rtbl->max - rtbl->min) / rtbl->step + 1;
332
333 for (idx = 1;
334 idx < rtbl_size && (idx * rtbl->step + rtbl->min <= value);
335 idx++)
336 ;
337 }
338
339 return idx - 1;
340 }
341
342 static u32 bq25890_find_val(u8 idx, enum bq25890_table_ids id)
343 {
344 const struct bq25890_range *rtbl;
345
346 /* lookup table? */
347 if (id >= TBL_TREG)
348 return bq25890_tables[id].lt.tbl[idx];
349
350 /* range table */
351 rtbl = &bq25890_tables[id].rt;
352
353 return (rtbl->min + idx * rtbl->step);
354 }
355
356 enum bq25890_status {
357 STATUS_NOT_CHARGING,
358 STATUS_PRE_CHARGING,
359 STATUS_FAST_CHARGING,
360 STATUS_TERMINATION_DONE,
361 };
362
363 enum bq25890_chrg_fault {
364 CHRG_FAULT_NORMAL,
365 CHRG_FAULT_INPUT,
366 CHRG_FAULT_THERMAL_SHUTDOWN,
367 CHRG_FAULT_TIMER_EXPIRED,
368 };
369
370 static int bq25890_power_supply_get_property(struct power_supply *psy,
371 enum power_supply_property psp,
372 union power_supply_propval *val)
373 {
374 int ret;
375 struct bq25890_device *bq = power_supply_get_drvdata(psy);
376 struct bq25890_state state;
377
378 mutex_lock(&bq->lock);
379 state = bq->state;
380 mutex_unlock(&bq->lock);
381
382 switch (psp) {
383 case POWER_SUPPLY_PROP_STATUS:
384 if (!state.online)
385 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
386 else if (state.chrg_status == STATUS_NOT_CHARGING)
387 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
388 else if (state.chrg_status == STATUS_PRE_CHARGING ||
389 state.chrg_status == STATUS_FAST_CHARGING)
390 val->intval = POWER_SUPPLY_STATUS_CHARGING;
391 else if (state.chrg_status == STATUS_TERMINATION_DONE)
392 val->intval = POWER_SUPPLY_STATUS_FULL;
393 else
394 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
395
396 break;
397
398 case POWER_SUPPLY_PROP_MANUFACTURER:
399 val->strval = BQ25890_MANUFACTURER;
400 break;
401
402 case POWER_SUPPLY_PROP_MODEL_NAME:
403 if (bq->chip_id == BQ25890_ID)
404 val->strval = "BQ25890";
405 else if (bq->chip_id == BQ25896_ID)
406 val->strval = "BQ25896";
407 else
408 val->strval = "UNKNOWN";
409
410 break;
411
412 case POWER_SUPPLY_PROP_ONLINE:
413 val->intval = state.online;
414 break;
415
416 case POWER_SUPPLY_PROP_HEALTH:
417 if (!state.chrg_fault && !state.bat_fault && !state.boost_fault)
418 val->intval = POWER_SUPPLY_HEALTH_GOOD;
419 else if (state.bat_fault)
420 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
421 else if (state.chrg_fault == CHRG_FAULT_TIMER_EXPIRED)
422 val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
423 else if (state.chrg_fault == CHRG_FAULT_THERMAL_SHUTDOWN)
424 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
425 else
426 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
427 break;
428
429 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
430 ret = bq25890_field_read(bq, F_ICHGR); /* read measured value */
431 if (ret < 0)
432 return ret;
433
434 /* converted_val = ADC_val * 50mA (table 10.3.19) */
435 val->intval = ret * 50000;
436 break;
437
438 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
439 val->intval = bq25890_find_val(bq->init_data.ichg, TBL_ICHG);
440 break;
441
442 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
443 if (!state.online) {
444 val->intval = 0;
445 break;
446 }
447
448 ret = bq25890_field_read(bq, F_BATV); /* read measured value */
449 if (ret < 0)
450 return ret;
451
452 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
453 val->intval = 2304000 + ret * 20000;
454 break;
455
456 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
457 val->intval = bq25890_find_val(bq->init_data.vreg, TBL_VREG);
458 break;
459
460 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
461 val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM);
462 break;
463
464 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
465 ret = bq25890_field_read(bq, F_SYSV); /* read measured value */
466 if (ret < 0)
467 return ret;
468
469 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
470 val->intval = 2304000 + ret * 20000;
471 break;
472
473 default:
474 return -EINVAL;
475 }
476
477 return 0;
478 }
479
480 static int bq25890_get_chip_state(struct bq25890_device *bq,
481 struct bq25890_state *state)
482 {
483 int i, ret;
484
485 struct {
486 enum bq25890_fields id;
487 u8 *data;
488 } state_fields[] = {
489 {F_CHG_STAT, &state->chrg_status},
490 {F_PG_STAT, &state->online},
491 {F_VSYS_STAT, &state->vsys_status},
492 {F_BOOST_FAULT, &state->boost_fault},
493 {F_BAT_FAULT, &state->bat_fault},
494 {F_CHG_FAULT, &state->chrg_fault}
495 };
496
497 for (i = 0; i < ARRAY_SIZE(state_fields); i++) {
498 ret = bq25890_field_read(bq, state_fields[i].id);
499 if (ret < 0)
500 return ret;
501
502 *state_fields[i].data = ret;
503 }
504
505 dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n",
506 state->chrg_status, state->online, state->vsys_status,
507 state->chrg_fault, state->boost_fault, state->bat_fault);
508
509 return 0;
510 }
511
512 static bool bq25890_state_changed(struct bq25890_device *bq,
513 struct bq25890_state *new_state)
514 {
515 struct bq25890_state old_state;
516
517 mutex_lock(&bq->lock);
518 old_state = bq->state;
519 mutex_unlock(&bq->lock);
520
521 return (old_state.chrg_status != new_state->chrg_status ||
522 old_state.chrg_fault != new_state->chrg_fault ||
523 old_state.online != new_state->online ||
524 old_state.bat_fault != new_state->bat_fault ||
525 old_state.boost_fault != new_state->boost_fault ||
526 old_state.vsys_status != new_state->vsys_status);
527 }
528
529 static void bq25890_handle_state_change(struct bq25890_device *bq,
530 struct bq25890_state *new_state)
531 {
532 int ret;
533 struct bq25890_state old_state;
534
535 mutex_lock(&bq->lock);
536 old_state = bq->state;
537 mutex_unlock(&bq->lock);
538
539 if (!new_state->online) { /* power removed */
540 /* disable ADC */
541 ret = bq25890_field_write(bq, F_CONV_START, 0);
542 if (ret < 0)
543 goto error;
544 } else if (!old_state.online) { /* power inserted */
545 /* enable ADC, to have control of charge current/voltage */
546 ret = bq25890_field_write(bq, F_CONV_START, 1);
547 if (ret < 0)
548 goto error;
549 }
550
551 return;
552
553 error:
554 dev_err(bq->dev, "Error communicating with the chip.\n");
555 }
556
557 static irqreturn_t bq25890_irq_handler_thread(int irq, void *private)
558 {
559 struct bq25890_device *bq = private;
560 int ret;
561 struct bq25890_state state;
562
563 ret = bq25890_get_chip_state(bq, &state);
564 if (ret < 0)
565 goto handled;
566
567 if (!bq25890_state_changed(bq, &state))
568 goto handled;
569
570 bq25890_handle_state_change(bq, &state);
571
572 mutex_lock(&bq->lock);
573 bq->state = state;
574 mutex_unlock(&bq->lock);
575
576 power_supply_changed(bq->charger);
577
578 handled:
579 return IRQ_HANDLED;
580 }
581
582 static int bq25890_chip_reset(struct bq25890_device *bq)
583 {
584 int ret;
585 int rst_check_counter = 10;
586
587 ret = bq25890_field_write(bq, F_REG_RST, 1);
588 if (ret < 0)
589 return ret;
590
591 do {
592 ret = bq25890_field_read(bq, F_REG_RST);
593 if (ret < 0)
594 return ret;
595
596 usleep_range(5, 10);
597 } while (ret == 1 && --rst_check_counter);
598
599 if (!rst_check_counter)
600 return -ETIMEDOUT;
601
602 return 0;
603 }
604
605 static int bq25890_hw_init(struct bq25890_device *bq)
606 {
607 int ret;
608 int i;
609 struct bq25890_state state;
610
611 const struct {
612 enum bq25890_fields id;
613 u32 value;
614 } init_data[] = {
615 {F_ICHG, bq->init_data.ichg},
616 {F_VREG, bq->init_data.vreg},
617 {F_ITERM, bq->init_data.iterm},
618 {F_IPRECHG, bq->init_data.iprechg},
619 {F_SYSVMIN, bq->init_data.sysvmin},
620 {F_BOOSTV, bq->init_data.boostv},
621 {F_BOOSTI, bq->init_data.boosti},
622 {F_BOOSTF, bq->init_data.boostf},
623 {F_EN_ILIM, bq->init_data.ilim_en},
624 {F_TREG, bq->init_data.treg}
625 };
626
627 ret = bq25890_chip_reset(bq);
628 if (ret < 0) {
629 dev_dbg(bq->dev, "Reset failed %d\n", ret);
630 return ret;
631 }
632
633 /* disable watchdog */
634 ret = bq25890_field_write(bq, F_WD, 0);
635 if (ret < 0) {
636 dev_dbg(bq->dev, "Disabling watchdog failed %d\n", ret);
637 return ret;
638 }
639
640 /* initialize currents/voltages and other parameters */
641 for (i = 0; i < ARRAY_SIZE(init_data); i++) {
642 ret = bq25890_field_write(bq, init_data[i].id,
643 init_data[i].value);
644 if (ret < 0) {
645 dev_dbg(bq->dev, "Writing init data failed %d\n", ret);
646 return ret;
647 }
648 }
649
650 /* Configure ADC for continuous conversions. This does not enable it. */
651 ret = bq25890_field_write(bq, F_CONV_RATE, 1);
652 if (ret < 0) {
653 dev_dbg(bq->dev, "Config ADC failed %d\n", ret);
654 return ret;
655 }
656
657 ret = bq25890_get_chip_state(bq, &state);
658 if (ret < 0) {
659 dev_dbg(bq->dev, "Get state failed %d\n", ret);
660 return ret;
661 }
662
663 mutex_lock(&bq->lock);
664 bq->state = state;
665 mutex_unlock(&bq->lock);
666
667 return 0;
668 }
669
670 static enum power_supply_property bq25890_power_supply_props[] = {
671 POWER_SUPPLY_PROP_MANUFACTURER,
672 POWER_SUPPLY_PROP_MODEL_NAME,
673 POWER_SUPPLY_PROP_STATUS,
674 POWER_SUPPLY_PROP_ONLINE,
675 POWER_SUPPLY_PROP_HEALTH,
676 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
677 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
678 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
679 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
680 POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
681 POWER_SUPPLY_PROP_VOLTAGE_NOW,
682 };
683
684 static char *bq25890_charger_supplied_to[] = {
685 "main-battery",
686 };
687
688 static const struct power_supply_desc bq25890_power_supply_desc = {
689 .name = "bq25890-charger",
690 .type = POWER_SUPPLY_TYPE_USB,
691 .properties = bq25890_power_supply_props,
692 .num_properties = ARRAY_SIZE(bq25890_power_supply_props),
693 .get_property = bq25890_power_supply_get_property,
694 };
695
696 static int bq25890_power_supply_init(struct bq25890_device *bq)
697 {
698 struct power_supply_config psy_cfg = { .drv_data = bq, };
699
700 psy_cfg.supplied_to = bq25890_charger_supplied_to;
701 psy_cfg.num_supplicants = ARRAY_SIZE(bq25890_charger_supplied_to);
702
703 bq->charger = power_supply_register(bq->dev, &bq25890_power_supply_desc,
704 &psy_cfg);
705
706 return PTR_ERR_OR_ZERO(bq->charger);
707 }
708
709 static void bq25890_usb_work(struct work_struct *data)
710 {
711 int ret;
712 struct bq25890_device *bq =
713 container_of(data, struct bq25890_device, usb_work);
714
715 switch (bq->usb_event) {
716 case USB_EVENT_ID:
717 /* Enable boost mode */
718 ret = bq25890_field_write(bq, F_OTG_CFG, 1);
719 if (ret < 0)
720 goto error;
721 break;
722
723 case USB_EVENT_NONE:
724 /* Disable boost mode */
725 ret = bq25890_field_write(bq, F_OTG_CFG, 0);
726 if (ret < 0)
727 goto error;
728
729 power_supply_changed(bq->charger);
730 break;
731 }
732
733 return;
734
735 error:
736 dev_err(bq->dev, "Error switching to boost/charger mode.\n");
737 }
738
739 static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val,
740 void *priv)
741 {
742 struct bq25890_device *bq =
743 container_of(nb, struct bq25890_device, usb_nb);
744
745 bq->usb_event = val;
746 queue_work(system_power_efficient_wq, &bq->usb_work);
747
748 return NOTIFY_OK;
749 }
750
751 static int bq25890_irq_probe(struct bq25890_device *bq)
752 {
753 struct gpio_desc *irq;
754
755 irq = devm_gpiod_get(bq->dev, BQ25890_IRQ_PIN, GPIOD_IN);
756 if (IS_ERR(irq)) {
757 dev_err(bq->dev, "Could not probe irq pin.\n");
758 return PTR_ERR(irq);
759 }
760
761 return gpiod_to_irq(irq);
762 }
763
764 static int bq25890_fw_read_u32_props(struct bq25890_device *bq)
765 {
766 int ret;
767 u32 property;
768 int i;
769 struct bq25890_init_data *init = &bq->init_data;
770 struct {
771 char *name;
772 bool optional;
773 enum bq25890_table_ids tbl_id;
774 u8 *conv_data; /* holds converted value from given property */
775 } props[] = {
776 /* required properties */
777 {"ti,charge-current", false, TBL_ICHG, &init->ichg},
778 {"ti,battery-regulation-voltage", false, TBL_VREG, &init->vreg},
779 {"ti,termination-current", false, TBL_ITERM, &init->iterm},
780 {"ti,precharge-current", false, TBL_ITERM, &init->iprechg},
781 {"ti,minimum-sys-voltage", false, TBL_SYSVMIN, &init->sysvmin},
782 {"ti,boost-voltage", false, TBL_BOOSTV, &init->boostv},
783 {"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti},
784
785 /* optional properties */
786 {"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg}
787 };
788
789 /* initialize data for optional properties */
790 init->treg = 3; /* 120 degrees Celsius */
791
792 for (i = 0; i < ARRAY_SIZE(props); i++) {
793 ret = device_property_read_u32(bq->dev, props[i].name,
794 &property);
795 if (ret < 0) {
796 if (props[i].optional)
797 continue;
798
799 dev_err(bq->dev, "Unable to read property %d %s\n", ret,
800 props[i].name);
801
802 return ret;
803 }
804
805 *props[i].conv_data = bq25890_find_idx(property,
806 props[i].tbl_id);
807 }
808
809 return 0;
810 }
811
812 static int bq25890_fw_probe(struct bq25890_device *bq)
813 {
814 int ret;
815 struct bq25890_init_data *init = &bq->init_data;
816
817 ret = bq25890_fw_read_u32_props(bq);
818 if (ret < 0)
819 return ret;
820
821 init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin");
822 init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq");
823
824 return 0;
825 }
826
827 static int bq25890_probe(struct i2c_client *client,
828 const struct i2c_device_id *id)
829 {
830 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
831 struct device *dev = &client->dev;
832 struct bq25890_device *bq;
833 int ret;
834 int i;
835
836 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
837 dev_err(dev, "No support for SMBUS_BYTE_DATA\n");
838 return -ENODEV;
839 }
840
841 bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL);
842 if (!bq)
843 return -ENOMEM;
844
845 bq->client = client;
846 bq->dev = dev;
847
848 mutex_init(&bq->lock);
849
850 bq->rmap = devm_regmap_init_i2c(client, &bq25890_regmap_config);
851 if (IS_ERR(bq->rmap)) {
852 dev_err(dev, "failed to allocate register map\n");
853 return PTR_ERR(bq->rmap);
854 }
855
856 for (i = 0; i < ARRAY_SIZE(bq25890_reg_fields); i++) {
857 const struct reg_field *reg_fields = bq25890_reg_fields;
858
859 bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap,
860 reg_fields[i]);
861 if (IS_ERR(bq->rmap_fields[i])) {
862 dev_err(dev, "cannot allocate regmap field\n");
863 return PTR_ERR(bq->rmap_fields[i]);
864 }
865 }
866
867 i2c_set_clientdata(client, bq);
868
869 bq->chip_id = bq25890_field_read(bq, F_PN);
870 if (bq->chip_id < 0) {
871 dev_err(dev, "Cannot read chip ID.\n");
872 return bq->chip_id;
873 }
874
875 if ((bq->chip_id != BQ25890_ID) && (bq->chip_id != BQ25896_ID)) {
876 dev_err(dev, "Chip with ID=%d, not supported!\n", bq->chip_id);
877 return -ENODEV;
878 }
879
880 if (!dev->platform_data) {
881 ret = bq25890_fw_probe(bq);
882 if (ret < 0) {
883 dev_err(dev, "Cannot read device properties.\n");
884 return ret;
885 }
886 } else {
887 return -ENODEV;
888 }
889
890 ret = bq25890_hw_init(bq);
891 if (ret < 0) {
892 dev_err(dev, "Cannot initialize the chip.\n");
893 return ret;
894 }
895
896 if (client->irq <= 0)
897 client->irq = bq25890_irq_probe(bq);
898
899 if (client->irq < 0) {
900 dev_err(dev, "No irq resource found.\n");
901 return client->irq;
902 }
903
904 /* OTG reporting */
905 bq->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
906 if (!IS_ERR_OR_NULL(bq->usb_phy)) {
907 INIT_WORK(&bq->usb_work, bq25890_usb_work);
908 bq->usb_nb.notifier_call = bq25890_usb_notifier;
909 usb_register_notifier(bq->usb_phy, &bq->usb_nb);
910 }
911
912 ret = devm_request_threaded_irq(dev, client->irq, NULL,
913 bq25890_irq_handler_thread,
914 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
915 BQ25890_IRQ_PIN, bq);
916 if (ret)
917 goto irq_fail;
918
919 ret = bq25890_power_supply_init(bq);
920 if (ret < 0) {
921 dev_err(dev, "Failed to register power supply\n");
922 goto irq_fail;
923 }
924
925 return 0;
926
927 irq_fail:
928 if (!IS_ERR_OR_NULL(bq->usb_phy))
929 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
930
931 return ret;
932 }
933
934 static int bq25890_remove(struct i2c_client *client)
935 {
936 struct bq25890_device *bq = i2c_get_clientdata(client);
937
938 power_supply_unregister(bq->charger);
939
940 if (!IS_ERR_OR_NULL(bq->usb_phy))
941 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
942
943 /* reset all registers to default values */
944 bq25890_chip_reset(bq);
945
946 return 0;
947 }
948
949 #ifdef CONFIG_PM_SLEEP
950 static int bq25890_suspend(struct device *dev)
951 {
952 struct bq25890_device *bq = dev_get_drvdata(dev);
953
954 /*
955 * If charger is removed, while in suspend, make sure ADC is diabled
956 * since it consumes slightly more power.
957 */
958 return bq25890_field_write(bq, F_CONV_START, 0);
959 }
960
961 static int bq25890_resume(struct device *dev)
962 {
963 int ret;
964 struct bq25890_state state;
965 struct bq25890_device *bq = dev_get_drvdata(dev);
966
967 ret = bq25890_get_chip_state(bq, &state);
968 if (ret < 0)
969 return ret;
970
971 mutex_lock(&bq->lock);
972 bq->state = state;
973 mutex_unlock(&bq->lock);
974
975 /* Re-enable ADC only if charger is plugged in. */
976 if (state.online) {
977 ret = bq25890_field_write(bq, F_CONV_START, 1);
978 if (ret < 0)
979 return ret;
980 }
981
982 /* signal userspace, maybe state changed while suspended */
983 power_supply_changed(bq->charger);
984
985 return 0;
986 }
987 #endif
988
989 static const struct dev_pm_ops bq25890_pm = {
990 SET_SYSTEM_SLEEP_PM_OPS(bq25890_suspend, bq25890_resume)
991 };
992
993 static const struct i2c_device_id bq25890_i2c_ids[] = {
994 { "bq25890", 0 },
995 {},
996 };
997 MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids);
998
999 static const struct of_device_id bq25890_of_match[] = {
1000 { .compatible = "ti,bq25890", },
1001 { },
1002 };
1003 MODULE_DEVICE_TABLE(of, bq25890_of_match);
1004
1005 static const struct acpi_device_id bq25890_acpi_match[] = {
1006 {"BQ258900", 0},
1007 {},
1008 };
1009 MODULE_DEVICE_TABLE(acpi, bq25890_acpi_match);
1010
1011 static struct i2c_driver bq25890_driver = {
1012 .driver = {
1013 .name = "bq25890-charger",
1014 .of_match_table = of_match_ptr(bq25890_of_match),
1015 .acpi_match_table = ACPI_PTR(bq25890_acpi_match),
1016 .pm = &bq25890_pm,
1017 },
1018 .probe = bq25890_probe,
1019 .remove = bq25890_remove,
1020 .id_table = bq25890_i2c_ids,
1021 };
1022 module_i2c_driver(bq25890_driver);
1023
1024 MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>");
1025 MODULE_DESCRIPTION("bq25890 charger driver");
1026 MODULE_LICENSE("GPL");
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