treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
[sfrench/cifs-2.6.git] / drivers / power / supply / bq25890_charger.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * TI BQ25890 charger driver
4  *
5  * Copyright (C) 2015 Intel Corporation
6  */
7
8 #include <linux/module.h>
9 #include <linux/i2c.h>
10 #include <linux/power_supply.h>
11 #include <linux/regmap.h>
12 #include <linux/types.h>
13 #include <linux/gpio/consumer.h>
14 #include <linux/interrupt.h>
15 #include <linux/delay.h>
16 #include <linux/usb/phy.h>
17
18 #include <linux/acpi.h>
19 #include <linux/of.h>
20
21 #define BQ25890_MANUFACTURER            "Texas Instruments"
22 #define BQ25890_IRQ_PIN                 "bq25890_irq"
23
24 #define BQ25890_ID                      3
25 #define BQ25896_ID                      0
26
27 enum bq25890_fields {
28         F_EN_HIZ, F_EN_ILIM, F_IILIM,                                /* Reg00 */
29         F_BHOT, F_BCOLD, F_VINDPM_OFS,                               /* Reg01 */
30         F_CONV_START, F_CONV_RATE, F_BOOSTF, F_ICO_EN,
31         F_HVDCP_EN, F_MAXC_EN, F_FORCE_DPM, F_AUTO_DPDM_EN,          /* Reg02 */
32         F_BAT_LOAD_EN, F_WD_RST, F_OTG_CFG, F_CHG_CFG, F_SYSVMIN,    /* Reg03 */
33         F_PUMPX_EN, F_ICHG,                                          /* Reg04 */
34         F_IPRECHG, F_ITERM,                                          /* Reg05 */
35         F_VREG, F_BATLOWV, F_VRECHG,                                 /* Reg06 */
36         F_TERM_EN, F_STAT_DIS, F_WD, F_TMR_EN, F_CHG_TMR,
37         F_JEITA_ISET,                                                /* Reg07 */
38         F_BATCMP, F_VCLAMP, F_TREG,                                  /* Reg08 */
39         F_FORCE_ICO, F_TMR2X_EN, F_BATFET_DIS, F_JEITA_VSET,
40         F_BATFET_DLY, F_BATFET_RST_EN, F_PUMPX_UP, F_PUMPX_DN,       /* Reg09 */
41         F_BOOSTV, F_BOOSTI,                                          /* Reg0A */
42         F_VBUS_STAT, F_CHG_STAT, F_PG_STAT, F_SDP_STAT, F_VSYS_STAT, /* Reg0B */
43         F_WD_FAULT, F_BOOST_FAULT, F_CHG_FAULT, F_BAT_FAULT,
44         F_NTC_FAULT,                                                 /* Reg0C */
45         F_FORCE_VINDPM, F_VINDPM,                                    /* Reg0D */
46         F_THERM_STAT, F_BATV,                                        /* Reg0E */
47         F_SYSV,                                                      /* Reg0F */
48         F_TSPCT,                                                     /* Reg10 */
49         F_VBUS_GD, F_VBUSV,                                          /* Reg11 */
50         F_ICHGR,                                                     /* Reg12 */
51         F_VDPM_STAT, F_IDPM_STAT, F_IDPM_LIM,                        /* Reg13 */
52         F_REG_RST, F_ICO_OPTIMIZED, F_PN, F_TS_PROFILE, F_DEV_REV,   /* Reg14 */
53
54         F_MAX_FIELDS
55 };
56
57 /* initial field values, converted to register values */
58 struct bq25890_init_data {
59         u8 ichg;        /* charge current               */
60         u8 vreg;        /* regulation voltage           */
61         u8 iterm;       /* termination current          */
62         u8 iprechg;     /* precharge current            */
63         u8 sysvmin;     /* minimum system voltage limit */
64         u8 boostv;      /* boost regulation voltage     */
65         u8 boosti;      /* boost current limit          */
66         u8 boostf;      /* boost frequency              */
67         u8 ilim_en;     /* enable ILIM pin              */
68         u8 treg;        /* thermal regulation threshold */
69 };
70
71 struct bq25890_state {
72         u8 online;
73         u8 chrg_status;
74         u8 chrg_fault;
75         u8 vsys_status;
76         u8 boost_fault;
77         u8 bat_fault;
78 };
79
80 struct bq25890_device {
81         struct i2c_client *client;
82         struct device *dev;
83         struct power_supply *charger;
84
85         struct usb_phy *usb_phy;
86         struct notifier_block usb_nb;
87         struct work_struct usb_work;
88         unsigned long usb_event;
89
90         struct regmap *rmap;
91         struct regmap_field *rmap_fields[F_MAX_FIELDS];
92
93         int chip_id;
94         struct bq25890_init_data init_data;
95         struct bq25890_state state;
96
97         struct mutex lock; /* protect state data */
98 };
99
100 static const struct regmap_range bq25890_readonly_reg_ranges[] = {
101         regmap_reg_range(0x0b, 0x0c),
102         regmap_reg_range(0x0e, 0x13),
103 };
104
105 static const struct regmap_access_table bq25890_writeable_regs = {
106         .no_ranges = bq25890_readonly_reg_ranges,
107         .n_no_ranges = ARRAY_SIZE(bq25890_readonly_reg_ranges),
108 };
109
110 static const struct regmap_range bq25890_volatile_reg_ranges[] = {
111         regmap_reg_range(0x00, 0x00),
112         regmap_reg_range(0x09, 0x09),
113         regmap_reg_range(0x0b, 0x0c),
114         regmap_reg_range(0x0e, 0x14),
115 };
116
117 static const struct regmap_access_table bq25890_volatile_regs = {
118         .yes_ranges = bq25890_volatile_reg_ranges,
119         .n_yes_ranges = ARRAY_SIZE(bq25890_volatile_reg_ranges),
120 };
121
122 static const struct regmap_config bq25890_regmap_config = {
123         .reg_bits = 8,
124         .val_bits = 8,
125
126         .max_register = 0x14,
127         .cache_type = REGCACHE_RBTREE,
128
129         .wr_table = &bq25890_writeable_regs,
130         .volatile_table = &bq25890_volatile_regs,
131 };
132
133 static const struct reg_field bq25890_reg_fields[] = {
134         /* REG00 */
135         [F_EN_HIZ]              = REG_FIELD(0x00, 7, 7),
136         [F_EN_ILIM]             = REG_FIELD(0x00, 6, 6),
137         [F_IILIM]               = REG_FIELD(0x00, 0, 5),
138         /* REG01 */
139         [F_BHOT]                = REG_FIELD(0x01, 6, 7),
140         [F_BCOLD]               = REG_FIELD(0x01, 5, 5),
141         [F_VINDPM_OFS]          = REG_FIELD(0x01, 0, 4),
142         /* REG02 */
143         [F_CONV_START]          = REG_FIELD(0x02, 7, 7),
144         [F_CONV_RATE]           = REG_FIELD(0x02, 6, 6),
145         [F_BOOSTF]              = REG_FIELD(0x02, 5, 5),
146         [F_ICO_EN]              = REG_FIELD(0x02, 4, 4),
147         [F_HVDCP_EN]            = REG_FIELD(0x02, 3, 3),  // reserved on BQ25896
148         [F_MAXC_EN]             = REG_FIELD(0x02, 2, 2),  // reserved on BQ25896
149         [F_FORCE_DPM]           = REG_FIELD(0x02, 1, 1),
150         [F_AUTO_DPDM_EN]        = REG_FIELD(0x02, 0, 0),
151         /* REG03 */
152         [F_BAT_LOAD_EN]         = REG_FIELD(0x03, 7, 7),
153         [F_WD_RST]              = REG_FIELD(0x03, 6, 6),
154         [F_OTG_CFG]             = REG_FIELD(0x03, 5, 5),
155         [F_CHG_CFG]             = REG_FIELD(0x03, 4, 4),
156         [F_SYSVMIN]             = REG_FIELD(0x03, 1, 3),
157         /* MIN_VBAT_SEL on BQ25896 */
158         /* REG04 */
159         [F_PUMPX_EN]            = REG_FIELD(0x04, 7, 7),
160         [F_ICHG]                = REG_FIELD(0x04, 0, 6),
161         /* REG05 */
162         [F_IPRECHG]             = REG_FIELD(0x05, 4, 7),
163         [F_ITERM]               = REG_FIELD(0x05, 0, 3),
164         /* REG06 */
165         [F_VREG]                = REG_FIELD(0x06, 2, 7),
166         [F_BATLOWV]             = REG_FIELD(0x06, 1, 1),
167         [F_VRECHG]              = REG_FIELD(0x06, 0, 0),
168         /* REG07 */
169         [F_TERM_EN]             = REG_FIELD(0x07, 7, 7),
170         [F_STAT_DIS]            = REG_FIELD(0x07, 6, 6),
171         [F_WD]                  = REG_FIELD(0x07, 4, 5),
172         [F_TMR_EN]              = REG_FIELD(0x07, 3, 3),
173         [F_CHG_TMR]             = REG_FIELD(0x07, 1, 2),
174         [F_JEITA_ISET]          = REG_FIELD(0x07, 0, 0),
175         /* REG08 */
176         [F_BATCMP]              = REG_FIELD(0x08, 5, 7),
177         [F_VCLAMP]              = REG_FIELD(0x08, 2, 4),
178         [F_TREG]                = REG_FIELD(0x08, 0, 1),
179         /* REG09 */
180         [F_FORCE_ICO]           = REG_FIELD(0x09, 7, 7),
181         [F_TMR2X_EN]            = REG_FIELD(0x09, 6, 6),
182         [F_BATFET_DIS]          = REG_FIELD(0x09, 5, 5),
183         [F_JEITA_VSET]          = REG_FIELD(0x09, 4, 4),
184         [F_BATFET_DLY]          = REG_FIELD(0x09, 3, 3),
185         [F_BATFET_RST_EN]       = REG_FIELD(0x09, 2, 2),
186         [F_PUMPX_UP]            = REG_FIELD(0x09, 1, 1),
187         [F_PUMPX_DN]            = REG_FIELD(0x09, 0, 0),
188         /* REG0A */
189         [F_BOOSTV]              = REG_FIELD(0x0A, 4, 7),
190         /* PFM_OTG_DIS 3 on BQ25896 */
191         [F_BOOSTI]              = REG_FIELD(0x0A, 0, 2),
192         /* REG0B */
193         [F_VBUS_STAT]           = REG_FIELD(0x0B, 5, 7),
194         [F_CHG_STAT]            = REG_FIELD(0x0B, 3, 4),
195         [F_PG_STAT]             = REG_FIELD(0x0B, 2, 2),
196         [F_SDP_STAT]            = REG_FIELD(0x0B, 1, 1), // reserved on BQ25896
197         [F_VSYS_STAT]           = REG_FIELD(0x0B, 0, 0),
198         /* REG0C */
199         [F_WD_FAULT]            = REG_FIELD(0x0C, 7, 7),
200         [F_BOOST_FAULT]         = REG_FIELD(0x0C, 6, 6),
201         [F_CHG_FAULT]           = REG_FIELD(0x0C, 4, 5),
202         [F_BAT_FAULT]           = REG_FIELD(0x0C, 3, 3),
203         [F_NTC_FAULT]           = REG_FIELD(0x0C, 0, 2),
204         /* REG0D */
205         [F_FORCE_VINDPM]        = REG_FIELD(0x0D, 7, 7),
206         [F_VINDPM]              = REG_FIELD(0x0D, 0, 6),
207         /* REG0E */
208         [F_THERM_STAT]          = REG_FIELD(0x0E, 7, 7),
209         [F_BATV]                = REG_FIELD(0x0E, 0, 6),
210         /* REG0F */
211         [F_SYSV]                = REG_FIELD(0x0F, 0, 6),
212         /* REG10 */
213         [F_TSPCT]               = REG_FIELD(0x10, 0, 6),
214         /* REG11 */
215         [F_VBUS_GD]             = REG_FIELD(0x11, 7, 7),
216         [F_VBUSV]               = REG_FIELD(0x11, 0, 6),
217         /* REG12 */
218         [F_ICHGR]               = REG_FIELD(0x12, 0, 6),
219         /* REG13 */
220         [F_VDPM_STAT]           = REG_FIELD(0x13, 7, 7),
221         [F_IDPM_STAT]           = REG_FIELD(0x13, 6, 6),
222         [F_IDPM_LIM]            = REG_FIELD(0x13, 0, 5),
223         /* REG14 */
224         [F_REG_RST]             = REG_FIELD(0x14, 7, 7),
225         [F_ICO_OPTIMIZED]       = REG_FIELD(0x14, 6, 6),
226         [F_PN]                  = REG_FIELD(0x14, 3, 5),
227         [F_TS_PROFILE]          = REG_FIELD(0x14, 2, 2),
228         [F_DEV_REV]             = REG_FIELD(0x14, 0, 1)
229 };
230
231 /*
232  * Most of the val -> idx conversions can be computed, given the minimum,
233  * maximum and the step between values. For the rest of conversions, we use
234  * lookup tables.
235  */
236 enum bq25890_table_ids {
237         /* range tables */
238         TBL_ICHG,
239         TBL_ITERM,
240         TBL_VREG,
241         TBL_BOOSTV,
242         TBL_SYSVMIN,
243
244         /* lookup tables */
245         TBL_TREG,
246         TBL_BOOSTI,
247 };
248
249 /* Thermal Regulation Threshold lookup table, in degrees Celsius */
250 static const u32 bq25890_treg_tbl[] = { 60, 80, 100, 120 };
251
252 #define BQ25890_TREG_TBL_SIZE           ARRAY_SIZE(bq25890_treg_tbl)
253
254 /* Boost mode current limit lookup table, in uA */
255 static const u32 bq25890_boosti_tbl[] = {
256         500000, 700000, 1100000, 1300000, 1600000, 1800000, 2100000, 2400000
257 };
258
259 #define BQ25890_BOOSTI_TBL_SIZE         ARRAY_SIZE(bq25890_boosti_tbl)
260
261 struct bq25890_range {
262         u32 min;
263         u32 max;
264         u32 step;
265 };
266
267 struct bq25890_lookup {
268         const u32 *tbl;
269         u32 size;
270 };
271
272 static const union {
273         struct bq25890_range  rt;
274         struct bq25890_lookup lt;
275 } bq25890_tables[] = {
276         /* range tables */
277         [TBL_ICHG] =    { .rt = {0,       5056000, 64000} },     /* uA */
278         [TBL_ITERM] =   { .rt = {64000,   1024000, 64000} },     /* uA */
279         [TBL_VREG] =    { .rt = {3840000, 4608000, 16000} },     /* uV */
280         [TBL_BOOSTV] =  { .rt = {4550000, 5510000, 64000} },     /* uV */
281         [TBL_SYSVMIN] = { .rt = {3000000, 3700000, 100000} },    /* uV */
282
283         /* lookup tables */
284         [TBL_TREG] =    { .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} },
285         [TBL_BOOSTI] =  { .lt = {bq25890_boosti_tbl, BQ25890_BOOSTI_TBL_SIZE} }
286 };
287
288 static int bq25890_field_read(struct bq25890_device *bq,
289                               enum bq25890_fields field_id)
290 {
291         int ret;
292         int val;
293
294         ret = regmap_field_read(bq->rmap_fields[field_id], &val);
295         if (ret < 0)
296                 return ret;
297
298         return val;
299 }
300
301 static int bq25890_field_write(struct bq25890_device *bq,
302                                enum bq25890_fields field_id, u8 val)
303 {
304         return regmap_field_write(bq->rmap_fields[field_id], val);
305 }
306
307 static u8 bq25890_find_idx(u32 value, enum bq25890_table_ids id)
308 {
309         u8 idx;
310
311         if (id >= TBL_TREG) {
312                 const u32 *tbl = bq25890_tables[id].lt.tbl;
313                 u32 tbl_size = bq25890_tables[id].lt.size;
314
315                 for (idx = 1; idx < tbl_size && tbl[idx] <= value; idx++)
316                         ;
317         } else {
318                 const struct bq25890_range *rtbl = &bq25890_tables[id].rt;
319                 u8 rtbl_size;
320
321                 rtbl_size = (rtbl->max - rtbl->min) / rtbl->step + 1;
322
323                 for (idx = 1;
324                      idx < rtbl_size && (idx * rtbl->step + rtbl->min <= value);
325                      idx++)
326                         ;
327         }
328
329         return idx - 1;
330 }
331
332 static u32 bq25890_find_val(u8 idx, enum bq25890_table_ids id)
333 {
334         const struct bq25890_range *rtbl;
335
336         /* lookup table? */
337         if (id >= TBL_TREG)
338                 return bq25890_tables[id].lt.tbl[idx];
339
340         /* range table */
341         rtbl = &bq25890_tables[id].rt;
342
343         return (rtbl->min + idx * rtbl->step);
344 }
345
346 enum bq25890_status {
347         STATUS_NOT_CHARGING,
348         STATUS_PRE_CHARGING,
349         STATUS_FAST_CHARGING,
350         STATUS_TERMINATION_DONE,
351 };
352
353 enum bq25890_chrg_fault {
354         CHRG_FAULT_NORMAL,
355         CHRG_FAULT_INPUT,
356         CHRG_FAULT_THERMAL_SHUTDOWN,
357         CHRG_FAULT_TIMER_EXPIRED,
358 };
359
360 static int bq25890_power_supply_get_property(struct power_supply *psy,
361                                              enum power_supply_property psp,
362                                              union power_supply_propval *val)
363 {
364         int ret;
365         struct bq25890_device *bq = power_supply_get_drvdata(psy);
366         struct bq25890_state state;
367
368         mutex_lock(&bq->lock);
369         state = bq->state;
370         mutex_unlock(&bq->lock);
371
372         switch (psp) {
373         case POWER_SUPPLY_PROP_STATUS:
374                 if (!state.online)
375                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
376                 else if (state.chrg_status == STATUS_NOT_CHARGING)
377                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
378                 else if (state.chrg_status == STATUS_PRE_CHARGING ||
379                          state.chrg_status == STATUS_FAST_CHARGING)
380                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
381                 else if (state.chrg_status == STATUS_TERMINATION_DONE)
382                         val->intval = POWER_SUPPLY_STATUS_FULL;
383                 else
384                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
385
386                 break;
387
388         case POWER_SUPPLY_PROP_MANUFACTURER:
389                 val->strval = BQ25890_MANUFACTURER;
390                 break;
391
392         case POWER_SUPPLY_PROP_MODEL_NAME:
393                 if (bq->chip_id == BQ25890_ID)
394                         val->strval = "BQ25890";
395                 else if (bq->chip_id == BQ25896_ID)
396                         val->strval = "BQ25896";
397                 else
398                         val->strval = "UNKNOWN";
399
400                 break;
401
402         case POWER_SUPPLY_PROP_ONLINE:
403                 val->intval = state.online;
404                 break;
405
406         case POWER_SUPPLY_PROP_HEALTH:
407                 if (!state.chrg_fault && !state.bat_fault && !state.boost_fault)
408                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
409                 else if (state.bat_fault)
410                         val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
411                 else if (state.chrg_fault == CHRG_FAULT_TIMER_EXPIRED)
412                         val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
413                 else if (state.chrg_fault == CHRG_FAULT_THERMAL_SHUTDOWN)
414                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
415                 else
416                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
417                 break;
418
419         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
420                 ret = bq25890_field_read(bq, F_ICHGR); /* read measured value */
421                 if (ret < 0)
422                         return ret;
423
424                 /* converted_val = ADC_val * 50mA (table 10.3.19) */
425                 val->intval = ret * 50000;
426                 break;
427
428         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
429                 val->intval = bq25890_find_val(bq->init_data.ichg, TBL_ICHG);
430                 break;
431
432         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
433                 if (!state.online) {
434                         val->intval = 0;
435                         break;
436                 }
437
438                 ret = bq25890_field_read(bq, F_BATV); /* read measured value */
439                 if (ret < 0)
440                         return ret;
441
442                 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
443                 val->intval = 2304000 + ret * 20000;
444                 break;
445
446         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
447                 val->intval = bq25890_find_val(bq->init_data.vreg, TBL_VREG);
448                 break;
449
450         case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
451                 val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM);
452                 break;
453
454         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
455                 ret = bq25890_field_read(bq, F_SYSV); /* read measured value */
456                 if (ret < 0)
457                         return ret;
458
459                 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
460                 val->intval = 2304000 + ret * 20000;
461                 break;
462
463         default:
464                 return -EINVAL;
465         }
466
467         return 0;
468 }
469
470 static int bq25890_get_chip_state(struct bq25890_device *bq,
471                                   struct bq25890_state *state)
472 {
473         int i, ret;
474
475         struct {
476                 enum bq25890_fields id;
477                 u8 *data;
478         } state_fields[] = {
479                 {F_CHG_STAT,    &state->chrg_status},
480                 {F_PG_STAT,     &state->online},
481                 {F_VSYS_STAT,   &state->vsys_status},
482                 {F_BOOST_FAULT, &state->boost_fault},
483                 {F_BAT_FAULT,   &state->bat_fault},
484                 {F_CHG_FAULT,   &state->chrg_fault}
485         };
486
487         for (i = 0; i < ARRAY_SIZE(state_fields); i++) {
488                 ret = bq25890_field_read(bq, state_fields[i].id);
489                 if (ret < 0)
490                         return ret;
491
492                 *state_fields[i].data = ret;
493         }
494
495         dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n",
496                 state->chrg_status, state->online, state->vsys_status,
497                 state->chrg_fault, state->boost_fault, state->bat_fault);
498
499         return 0;
500 }
501
502 static bool bq25890_state_changed(struct bq25890_device *bq,
503                                   struct bq25890_state *new_state)
504 {
505         struct bq25890_state old_state;
506
507         mutex_lock(&bq->lock);
508         old_state = bq->state;
509         mutex_unlock(&bq->lock);
510
511         return (old_state.chrg_status != new_state->chrg_status ||
512                 old_state.chrg_fault != new_state->chrg_fault   ||
513                 old_state.online != new_state->online           ||
514                 old_state.bat_fault != new_state->bat_fault     ||
515                 old_state.boost_fault != new_state->boost_fault ||
516                 old_state.vsys_status != new_state->vsys_status);
517 }
518
519 static void bq25890_handle_state_change(struct bq25890_device *bq,
520                                         struct bq25890_state *new_state)
521 {
522         int ret;
523         struct bq25890_state old_state;
524
525         mutex_lock(&bq->lock);
526         old_state = bq->state;
527         mutex_unlock(&bq->lock);
528
529         if (!new_state->online) {                            /* power removed */
530                 /* disable ADC */
531                 ret = bq25890_field_write(bq, F_CONV_START, 0);
532                 if (ret < 0)
533                         goto error;
534         } else if (!old_state.online) {                     /* power inserted */
535                 /* enable ADC, to have control of charge current/voltage */
536                 ret = bq25890_field_write(bq, F_CONV_START, 1);
537                 if (ret < 0)
538                         goto error;
539         }
540
541         return;
542
543 error:
544         dev_err(bq->dev, "Error communicating with the chip.\n");
545 }
546
547 static irqreturn_t bq25890_irq_handler_thread(int irq, void *private)
548 {
549         struct bq25890_device *bq = private;
550         int ret;
551         struct bq25890_state state;
552
553         ret = bq25890_get_chip_state(bq, &state);
554         if (ret < 0)
555                 goto handled;
556
557         if (!bq25890_state_changed(bq, &state))
558                 goto handled;
559
560         bq25890_handle_state_change(bq, &state);
561
562         mutex_lock(&bq->lock);
563         bq->state = state;
564         mutex_unlock(&bq->lock);
565
566         power_supply_changed(bq->charger);
567
568 handled:
569         return IRQ_HANDLED;
570 }
571
572 static int bq25890_chip_reset(struct bq25890_device *bq)
573 {
574         int ret;
575         int rst_check_counter = 10;
576
577         ret = bq25890_field_write(bq, F_REG_RST, 1);
578         if (ret < 0)
579                 return ret;
580
581         do {
582                 ret = bq25890_field_read(bq, F_REG_RST);
583                 if (ret < 0)
584                         return ret;
585
586                 usleep_range(5, 10);
587         } while (ret == 1 && --rst_check_counter);
588
589         if (!rst_check_counter)
590                 return -ETIMEDOUT;
591
592         return 0;
593 }
594
595 static int bq25890_hw_init(struct bq25890_device *bq)
596 {
597         int ret;
598         int i;
599         struct bq25890_state state;
600
601         const struct {
602                 enum bq25890_fields id;
603                 u32 value;
604         } init_data[] = {
605                 {F_ICHG,         bq->init_data.ichg},
606                 {F_VREG,         bq->init_data.vreg},
607                 {F_ITERM,        bq->init_data.iterm},
608                 {F_IPRECHG,      bq->init_data.iprechg},
609                 {F_SYSVMIN,      bq->init_data.sysvmin},
610                 {F_BOOSTV,       bq->init_data.boostv},
611                 {F_BOOSTI,       bq->init_data.boosti},
612                 {F_BOOSTF,       bq->init_data.boostf},
613                 {F_EN_ILIM,      bq->init_data.ilim_en},
614                 {F_TREG,         bq->init_data.treg}
615         };
616
617         ret = bq25890_chip_reset(bq);
618         if (ret < 0) {
619                 dev_dbg(bq->dev, "Reset failed %d\n", ret);
620                 return ret;
621         }
622
623         /* disable watchdog */
624         ret = bq25890_field_write(bq, F_WD, 0);
625         if (ret < 0) {
626                 dev_dbg(bq->dev, "Disabling watchdog failed %d\n", ret);
627                 return ret;
628         }
629
630         /* initialize currents/voltages and other parameters */
631         for (i = 0; i < ARRAY_SIZE(init_data); i++) {
632                 ret = bq25890_field_write(bq, init_data[i].id,
633                                           init_data[i].value);
634                 if (ret < 0) {
635                         dev_dbg(bq->dev, "Writing init data failed %d\n", ret);
636                         return ret;
637                 }
638         }
639
640         /* Configure ADC for continuous conversions. This does not enable it. */
641         ret = bq25890_field_write(bq, F_CONV_RATE, 1);
642         if (ret < 0) {
643                 dev_dbg(bq->dev, "Config ADC failed %d\n", ret);
644                 return ret;
645         }
646
647         ret = bq25890_get_chip_state(bq, &state);
648         if (ret < 0) {
649                 dev_dbg(bq->dev, "Get state failed %d\n", ret);
650                 return ret;
651         }
652
653         mutex_lock(&bq->lock);
654         bq->state = state;
655         mutex_unlock(&bq->lock);
656
657         return 0;
658 }
659
660 static enum power_supply_property bq25890_power_supply_props[] = {
661         POWER_SUPPLY_PROP_MANUFACTURER,
662         POWER_SUPPLY_PROP_MODEL_NAME,
663         POWER_SUPPLY_PROP_STATUS,
664         POWER_SUPPLY_PROP_ONLINE,
665         POWER_SUPPLY_PROP_HEALTH,
666         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
667         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
668         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
669         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
670         POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
671         POWER_SUPPLY_PROP_VOLTAGE_NOW,
672 };
673
674 static char *bq25890_charger_supplied_to[] = {
675         "main-battery",
676 };
677
678 static const struct power_supply_desc bq25890_power_supply_desc = {
679         .name = "bq25890-charger",
680         .type = POWER_SUPPLY_TYPE_USB,
681         .properties = bq25890_power_supply_props,
682         .num_properties = ARRAY_SIZE(bq25890_power_supply_props),
683         .get_property = bq25890_power_supply_get_property,
684 };
685
686 static int bq25890_power_supply_init(struct bq25890_device *bq)
687 {
688         struct power_supply_config psy_cfg = { .drv_data = bq, };
689
690         psy_cfg.supplied_to = bq25890_charger_supplied_to;
691         psy_cfg.num_supplicants = ARRAY_SIZE(bq25890_charger_supplied_to);
692
693         bq->charger = power_supply_register(bq->dev, &bq25890_power_supply_desc,
694                                             &psy_cfg);
695
696         return PTR_ERR_OR_ZERO(bq->charger);
697 }
698
699 static void bq25890_usb_work(struct work_struct *data)
700 {
701         int ret;
702         struct bq25890_device *bq =
703                         container_of(data, struct bq25890_device, usb_work);
704
705         switch (bq->usb_event) {
706         case USB_EVENT_ID:
707                 /* Enable boost mode */
708                 ret = bq25890_field_write(bq, F_OTG_CFG, 1);
709                 if (ret < 0)
710                         goto error;
711                 break;
712
713         case USB_EVENT_NONE:
714                 /* Disable boost mode */
715                 ret = bq25890_field_write(bq, F_OTG_CFG, 0);
716                 if (ret < 0)
717                         goto error;
718
719                 power_supply_changed(bq->charger);
720                 break;
721         }
722
723         return;
724
725 error:
726         dev_err(bq->dev, "Error switching to boost/charger mode.\n");
727 }
728
729 static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val,
730                                 void *priv)
731 {
732         struct bq25890_device *bq =
733                         container_of(nb, struct bq25890_device, usb_nb);
734
735         bq->usb_event = val;
736         queue_work(system_power_efficient_wq, &bq->usb_work);
737
738         return NOTIFY_OK;
739 }
740
741 static int bq25890_irq_probe(struct bq25890_device *bq)
742 {
743         struct gpio_desc *irq;
744
745         irq = devm_gpiod_get(bq->dev, BQ25890_IRQ_PIN, GPIOD_IN);
746         if (IS_ERR(irq)) {
747                 dev_err(bq->dev, "Could not probe irq pin.\n");
748                 return PTR_ERR(irq);
749         }
750
751         return gpiod_to_irq(irq);
752 }
753
754 static int bq25890_fw_read_u32_props(struct bq25890_device *bq)
755 {
756         int ret;
757         u32 property;
758         int i;
759         struct bq25890_init_data *init = &bq->init_data;
760         struct {
761                 char *name;
762                 bool optional;
763                 enum bq25890_table_ids tbl_id;
764                 u8 *conv_data; /* holds converted value from given property */
765         } props[] = {
766                 /* required properties */
767                 {"ti,charge-current", false, TBL_ICHG, &init->ichg},
768                 {"ti,battery-regulation-voltage", false, TBL_VREG, &init->vreg},
769                 {"ti,termination-current", false, TBL_ITERM, &init->iterm},
770                 {"ti,precharge-current", false, TBL_ITERM, &init->iprechg},
771                 {"ti,minimum-sys-voltage", false, TBL_SYSVMIN, &init->sysvmin},
772                 {"ti,boost-voltage", false, TBL_BOOSTV, &init->boostv},
773                 {"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti},
774
775                 /* optional properties */
776                 {"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg}
777         };
778
779         /* initialize data for optional properties */
780         init->treg = 3; /* 120 degrees Celsius */
781
782         for (i = 0; i < ARRAY_SIZE(props); i++) {
783                 ret = device_property_read_u32(bq->dev, props[i].name,
784                                                &property);
785                 if (ret < 0) {
786                         if (props[i].optional)
787                                 continue;
788
789                         dev_err(bq->dev, "Unable to read property %d %s\n", ret,
790                                 props[i].name);
791
792                         return ret;
793                 }
794
795                 *props[i].conv_data = bq25890_find_idx(property,
796                                                        props[i].tbl_id);
797         }
798
799         return 0;
800 }
801
802 static int bq25890_fw_probe(struct bq25890_device *bq)
803 {
804         int ret;
805         struct bq25890_init_data *init = &bq->init_data;
806
807         ret = bq25890_fw_read_u32_props(bq);
808         if (ret < 0)
809                 return ret;
810
811         init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin");
812         init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq");
813
814         return 0;
815 }
816
817 static int bq25890_probe(struct i2c_client *client,
818                          const struct i2c_device_id *id)
819 {
820         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
821         struct device *dev = &client->dev;
822         struct bq25890_device *bq;
823         int ret;
824         int i;
825
826         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
827                 dev_err(dev, "No support for SMBUS_BYTE_DATA\n");
828                 return -ENODEV;
829         }
830
831         bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL);
832         if (!bq)
833                 return -ENOMEM;
834
835         bq->client = client;
836         bq->dev = dev;
837
838         mutex_init(&bq->lock);
839
840         bq->rmap = devm_regmap_init_i2c(client, &bq25890_regmap_config);
841         if (IS_ERR(bq->rmap)) {
842                 dev_err(dev, "failed to allocate register map\n");
843                 return PTR_ERR(bq->rmap);
844         }
845
846         for (i = 0; i < ARRAY_SIZE(bq25890_reg_fields); i++) {
847                 const struct reg_field *reg_fields = bq25890_reg_fields;
848
849                 bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap,
850                                                              reg_fields[i]);
851                 if (IS_ERR(bq->rmap_fields[i])) {
852                         dev_err(dev, "cannot allocate regmap field\n");
853                         return PTR_ERR(bq->rmap_fields[i]);
854                 }
855         }
856
857         i2c_set_clientdata(client, bq);
858
859         bq->chip_id = bq25890_field_read(bq, F_PN);
860         if (bq->chip_id < 0) {
861                 dev_err(dev, "Cannot read chip ID.\n");
862                 return bq->chip_id;
863         }
864
865         if ((bq->chip_id != BQ25890_ID) && (bq->chip_id != BQ25896_ID)) {
866                 dev_err(dev, "Chip with ID=%d, not supported!\n", bq->chip_id);
867                 return -ENODEV;
868         }
869
870         if (!dev->platform_data) {
871                 ret = bq25890_fw_probe(bq);
872                 if (ret < 0) {
873                         dev_err(dev, "Cannot read device properties.\n");
874                         return ret;
875                 }
876         } else {
877                 return -ENODEV;
878         }
879
880         ret = bq25890_hw_init(bq);
881         if (ret < 0) {
882                 dev_err(dev, "Cannot initialize the chip.\n");
883                 return ret;
884         }
885
886         if (client->irq <= 0)
887                 client->irq = bq25890_irq_probe(bq);
888
889         if (client->irq < 0) {
890                 dev_err(dev, "No irq resource found.\n");
891                 return client->irq;
892         }
893
894         /* OTG reporting */
895         bq->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
896         if (!IS_ERR_OR_NULL(bq->usb_phy)) {
897                 INIT_WORK(&bq->usb_work, bq25890_usb_work);
898                 bq->usb_nb.notifier_call = bq25890_usb_notifier;
899                 usb_register_notifier(bq->usb_phy, &bq->usb_nb);
900         }
901
902         ret = devm_request_threaded_irq(dev, client->irq, NULL,
903                                         bq25890_irq_handler_thread,
904                                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
905                                         BQ25890_IRQ_PIN, bq);
906         if (ret)
907                 goto irq_fail;
908
909         ret = bq25890_power_supply_init(bq);
910         if (ret < 0) {
911                 dev_err(dev, "Failed to register power supply\n");
912                 goto irq_fail;
913         }
914
915         return 0;
916
917 irq_fail:
918         if (!IS_ERR_OR_NULL(bq->usb_phy))
919                 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
920
921         return ret;
922 }
923
924 static int bq25890_remove(struct i2c_client *client)
925 {
926         struct bq25890_device *bq = i2c_get_clientdata(client);
927
928         power_supply_unregister(bq->charger);
929
930         if (!IS_ERR_OR_NULL(bq->usb_phy))
931                 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
932
933         /* reset all registers to default values */
934         bq25890_chip_reset(bq);
935
936         return 0;
937 }
938
939 #ifdef CONFIG_PM_SLEEP
940 static int bq25890_suspend(struct device *dev)
941 {
942         struct bq25890_device *bq = dev_get_drvdata(dev);
943
944         /*
945          * If charger is removed, while in suspend, make sure ADC is diabled
946          * since it consumes slightly more power.
947          */
948         return bq25890_field_write(bq, F_CONV_START, 0);
949 }
950
951 static int bq25890_resume(struct device *dev)
952 {
953         int ret;
954         struct bq25890_state state;
955         struct bq25890_device *bq = dev_get_drvdata(dev);
956
957         ret = bq25890_get_chip_state(bq, &state);
958         if (ret < 0)
959                 return ret;
960
961         mutex_lock(&bq->lock);
962         bq->state = state;
963         mutex_unlock(&bq->lock);
964
965         /* Re-enable ADC only if charger is plugged in. */
966         if (state.online) {
967                 ret = bq25890_field_write(bq, F_CONV_START, 1);
968                 if (ret < 0)
969                         return ret;
970         }
971
972         /* signal userspace, maybe state changed while suspended */
973         power_supply_changed(bq->charger);
974
975         return 0;
976 }
977 #endif
978
979 static const struct dev_pm_ops bq25890_pm = {
980         SET_SYSTEM_SLEEP_PM_OPS(bq25890_suspend, bq25890_resume)
981 };
982
983 static const struct i2c_device_id bq25890_i2c_ids[] = {
984         { "bq25890", 0 },
985         {},
986 };
987 MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids);
988
989 static const struct of_device_id bq25890_of_match[] = {
990         { .compatible = "ti,bq25890", },
991         { },
992 };
993 MODULE_DEVICE_TABLE(of, bq25890_of_match);
994
995 static const struct acpi_device_id bq25890_acpi_match[] = {
996         {"BQ258900", 0},
997         {},
998 };
999 MODULE_DEVICE_TABLE(acpi, bq25890_acpi_match);
1000
1001 static struct i2c_driver bq25890_driver = {
1002         .driver = {
1003                 .name = "bq25890-charger",
1004                 .of_match_table = of_match_ptr(bq25890_of_match),
1005                 .acpi_match_table = ACPI_PTR(bq25890_acpi_match),
1006                 .pm = &bq25890_pm,
1007         },
1008         .probe = bq25890_probe,
1009         .remove = bq25890_remove,
1010         .id_table = bq25890_i2c_ids,
1011 };
1012 module_i2c_driver(bq25890_driver);
1013
1014 MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>");
1015 MODULE_DESCRIPTION("bq25890 charger driver");
1016 MODULE_LICENSE("GPL");