1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ROHM BD99954 charger driver
4 *
5 * Copyright (C) 2020 Rohm Semiconductors
6 * Originally written by:
7 * Mikko Mutanen <mikko.mutanen@fi.rohmeurope.com>
8 * Markus Laine <markus.laine@fi.rohmeurope.com>
9 * Bugs added by:
10 * Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
11 */
12
13 /*
14 * The battery charging profile of BD99954.
15 *
16 * Curve (1) represents charging current.
17 * Curve (2) represents battery voltage.
18 *
19 * The BD99954 data sheet divides charging to three phases.
20 * a) Trickle-charge with constant current (8).
21 * b) pre-charge with constant current (6)
22 * c) fast-charge, first with constant current (5) phase. After
23 * the battery voltage has reached target level (4) we have constant
24 * voltage phase until charging current has dropped to termination
25 * level (7)
26 *
27 * V ^ ^ I
28 * . .
29 * . .
30 *(4)` `.` ` ` ` ` ` ` ` ` ` ` ` ` ` ----------------------------.
31 * . :/ .
32 * . o----+/:/ ` ` ` ` ` ` ` ` ` ` ` ` `.` ` (5)
33 * . + :: + .
34 * . + /- -- .
35 * . +`/- + .
36 * . o/- -: .
37 * . .s. +` .
38 * . .--+ `/ .
39 * . ..`` + .: .
40 * . -` + -- .
41 * . (2) ...`` + :- .
42 * . ...`` + -: .
43 *(3)` `.`."" ` ` ` `+-------- ` ` ` ` ` ` `.:` ` ` ` ` ` ` ` ` .` ` (6)
44 * . + `:. .
45 * . + -: .
46 * . + -:. .
47 * . + .--. .
48 * . (1) + `.+` ` ` `.` ` (7)
49 * -..............` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` + ` ` ` .` ` (8)
50 * . + -
51 * -------------------------------------------------+++++++++-->
52 * | trickle | pre | fast |
53 *
54 * Details of DT properties for different limits can be found from BD99954
55 * device tree binding documentation.
56 */
57
58 #include <linux/delay.h>
59 #include <linux/gpio/consumer.h>
60 #include <linux/interrupt.h>
61 #include <linux/i2c.h>
62 #include <linux/kernel.h>
63 #include <linux/linear_range.h>
64 #include <linux/module.h>
65 #include <linux/mod_devicetable.h>
66 #include <linux/power_supply.h>
67 #include <linux/property.h>
68 #include <linux/regmap.h>
69 #include <linux/types.h>
70
71 #include "bd99954-charger.h"
72
73 struct battery_data {
74 u16 precharge_current; /* Trickle-charge Current */
75 u16 fc_reg_voltage; /* Fast Charging Regulation Voltage */
76 u16 voltage_min;
77 u16 voltage_max;
78 };
79
80 /* Initial field values, converted to initial register values */
81 struct bd9995x_init_data {
82 u16 vsysreg_set; /* VSYS Regulation Setting */
83 u16 ibus_lim_set; /* VBUS input current limitation */
84 u16 icc_lim_set; /* VCC/VACP Input Current Limit Setting */
85 u16 itrich_set; /* Trickle-charge Current Setting */
86 u16 iprech_set; /* Pre-Charge Current Setting */
87 u16 ichg_set; /* Fast-Charge constant current */
88 u16 vfastchg_reg_set1; /* Fast Charging Regulation Voltage */
89 u16 vprechg_th_set; /* Pre-charge Voltage Threshold Setting */
90 u16 vrechg_set; /* Re-charge Battery Voltage Setting */
91 u16 vbatovp_set; /* Battery Over Voltage Threshold Setting */
92 u16 iterm_set; /* Charging termination current */
93 };
94
95 struct bd9995x_state {
96 u8 online;
97 u16 chgstm_status;
98 u16 vbat_vsys_status;
99 u16 vbus_vcc_status;
100 };
101
102 struct bd9995x_device {
103 struct i2c_client *client;
104 struct device *dev;
105 struct power_supply *charger;
106
107 struct regmap *rmap;
108 struct regmap_field *rmap_fields[F_MAX_FIELDS];
109
110 int chip_id;
111 int chip_rev;
112 struct bd9995x_init_data init_data;
113 struct bd9995x_state state;
114
115 struct mutex lock; /* Protect state data */
116 };
117
118 static const struct regmap_range bd9995x_readonly_reg_ranges[] = {
119 regmap_reg_range(CHGSTM_STATUS, SEL_ILIM_VAL),
120 regmap_reg_range(IOUT_DACIN_VAL, IOUT_DACIN_VAL),
121 regmap_reg_range(VCC_UCD_STATUS, VCC_IDD_STATUS),
122 regmap_reg_range(VBUS_UCD_STATUS, VBUS_IDD_STATUS),
123 regmap_reg_range(CHIP_ID, CHIP_REV),
124 regmap_reg_range(SYSTEM_STATUS, SYSTEM_STATUS),
125 regmap_reg_range(IBATP_VAL, VBAT_AVE_VAL),
126 regmap_reg_range(VTH_VAL, EXTIADP_AVE_VAL),
127 };
128
129 static const struct regmap_access_table bd9995x_writeable_regs = {
130 .no_ranges = bd9995x_readonly_reg_ranges,
131 .n_no_ranges = ARRAY_SIZE(bd9995x_readonly_reg_ranges),
132 };
133
134 static const struct regmap_range bd9995x_volatile_reg_ranges[] = {
135 regmap_reg_range(CHGSTM_STATUS, WDT_STATUS),
136 regmap_reg_range(VCC_UCD_STATUS, VCC_IDD_STATUS),
137 regmap_reg_range(VBUS_UCD_STATUS, VBUS_IDD_STATUS),
138 regmap_reg_range(INT0_STATUS, INT7_STATUS),
139 regmap_reg_range(SYSTEM_STATUS, SYSTEM_CTRL_SET),
140 regmap_reg_range(IBATP_VAL, EXTIADP_AVE_VAL), /* Measurement regs */
141 };
142
143 static const struct regmap_access_table bd9995x_volatile_regs = {
144 .yes_ranges = bd9995x_volatile_reg_ranges,
145 .n_yes_ranges = ARRAY_SIZE(bd9995x_volatile_reg_ranges),
146 };
147
148 static const struct regmap_range_cfg regmap_range_cfg[] = {
149 {
150 .selector_reg = MAP_SET,
151 .selector_mask = 0xFFFF,
152 .selector_shift = 0,
153 .window_start = 0,
154 .window_len = 0x100,
155 .range_min = 0 * 0x100,
156 .range_max = 3 * 0x100,
157 },
158 };
159
160 static const struct regmap_config bd9995x_regmap_config = {
161 .reg_bits = 8,
162 .val_bits = 16,
163 .reg_stride = 1,
164
165 .max_register = 3 * 0x100,
166 .cache_type = REGCACHE_RBTREE,
167
168 .ranges = regmap_range_cfg,
169 .num_ranges = ARRAY_SIZE(regmap_range_cfg),
170 .val_format_endian = REGMAP_ENDIAN_LITTLE,
171 .wr_table = &bd9995x_writeable_regs,
172 .volatile_table = &bd9995x_volatile_regs,
173 };
174
175 enum bd9995x_chrg_fault {
176 CHRG_FAULT_NORMAL,
177 CHRG_FAULT_INPUT,
178 CHRG_FAULT_THERMAL_SHUTDOWN,
179 CHRG_FAULT_TIMER_EXPIRED,
180 };
181
bd9995x_get_prop_batt_health(struct bd9995x_device * bd)182 static int bd9995x_get_prop_batt_health(struct bd9995x_device *bd)
183 {
184 int ret, tmp;
185
186 ret = regmap_field_read(bd->rmap_fields[F_BATTEMP], &tmp);
187 if (ret)
188 return POWER_SUPPLY_HEALTH_UNKNOWN;
189
190 /* TODO: Check these against datasheet page 34 */
191
192 switch (tmp) {
193 case ROOM:
194 return POWER_SUPPLY_HEALTH_GOOD;
195 case HOT1:
196 case HOT2:
197 case HOT3:
198 return POWER_SUPPLY_HEALTH_OVERHEAT;
199 case COLD1:
200 case COLD2:
201 return POWER_SUPPLY_HEALTH_COLD;
202 case TEMP_DIS:
203 case BATT_OPEN:
204 default:
205 return POWER_SUPPLY_HEALTH_UNKNOWN;
206 }
207 }
208
bd9995x_get_prop_charge_type(struct bd9995x_device * bd)209 static int bd9995x_get_prop_charge_type(struct bd9995x_device *bd)
210 {
211 int ret, tmp;
212
213 ret = regmap_field_read(bd->rmap_fields[F_CHGSTM_STATE], &tmp);
214 if (ret)
215 return POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
216
217 switch (tmp) {
218 case CHGSTM_TRICKLE_CHARGE:
219 case CHGSTM_PRE_CHARGE:
220 return POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
221 case CHGSTM_FAST_CHARGE:
222 return POWER_SUPPLY_CHARGE_TYPE_FAST;
223 case CHGSTM_TOP_OFF:
224 case CHGSTM_DONE:
225 case CHGSTM_SUSPEND:
226 return POWER_SUPPLY_CHARGE_TYPE_NONE;
227 default: /* Rest of the states are error related, no charging */
228 return POWER_SUPPLY_CHARGE_TYPE_NONE;
229 }
230 }
231
bd9995x_get_prop_batt_present(struct bd9995x_device * bd)232 static bool bd9995x_get_prop_batt_present(struct bd9995x_device *bd)
233 {
234 int ret, tmp;
235
236 ret = regmap_field_read(bd->rmap_fields[F_BATTEMP], &tmp);
237 if (ret)
238 return false;
239
240 return tmp != BATT_OPEN;
241 }
242
bd9995x_get_prop_batt_voltage(struct bd9995x_device * bd)243 static int bd9995x_get_prop_batt_voltage(struct bd9995x_device *bd)
244 {
245 int ret, tmp;
246
247 ret = regmap_field_read(bd->rmap_fields[F_VBAT_VAL], &tmp);
248 if (ret)
249 return 0;
250
251 tmp = min(tmp, 19200);
252
253 return tmp * 1000;
254 }
255
bd9995x_get_prop_batt_current(struct bd9995x_device * bd)256 static int bd9995x_get_prop_batt_current(struct bd9995x_device *bd)
257 {
258 int ret, tmp;
259
260 ret = regmap_field_read(bd->rmap_fields[F_IBATP_VAL], &tmp);
261 if (ret)
262 return 0;
263
264 return tmp * 1000;
265 }
266
267 #define DEFAULT_BATTERY_TEMPERATURE 250
268
bd9995x_get_prop_batt_temp(struct bd9995x_device * bd)269 static int bd9995x_get_prop_batt_temp(struct bd9995x_device *bd)
270 {
271 int ret, tmp;
272
273 ret = regmap_field_read(bd->rmap_fields[F_THERM_VAL], &tmp);
274 if (ret)
275 return DEFAULT_BATTERY_TEMPERATURE;
276
277 return (200 - tmp) * 10;
278 }
279
bd9995x_power_supply_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)280 static int bd9995x_power_supply_get_property(struct power_supply *psy,
281 enum power_supply_property psp,
282 union power_supply_propval *val)
283 {
284 int ret, tmp;
285 struct bd9995x_device *bd = power_supply_get_drvdata(psy);
286 struct bd9995x_state state;
287
288 mutex_lock(&bd->lock);
289 state = bd->state;
290 mutex_unlock(&bd->lock);
291
292 switch (psp) {
293 case POWER_SUPPLY_PROP_STATUS:
294 switch (state.chgstm_status) {
295 case CHGSTM_TRICKLE_CHARGE:
296 case CHGSTM_PRE_CHARGE:
297 case CHGSTM_FAST_CHARGE:
298 case CHGSTM_TOP_OFF:
299 val->intval = POWER_SUPPLY_STATUS_CHARGING;
300 break;
301
302 case CHGSTM_DONE:
303 val->intval = POWER_SUPPLY_STATUS_FULL;
304 break;
305
306 case CHGSTM_SUSPEND:
307 case CHGSTM_TEMPERATURE_ERROR_1:
308 case CHGSTM_TEMPERATURE_ERROR_2:
309 case CHGSTM_TEMPERATURE_ERROR_3:
310 case CHGSTM_TEMPERATURE_ERROR_4:
311 case CHGSTM_TEMPERATURE_ERROR_5:
312 case CHGSTM_TEMPERATURE_ERROR_6:
313 case CHGSTM_TEMPERATURE_ERROR_7:
314 case CHGSTM_THERMAL_SHUT_DOWN_1:
315 case CHGSTM_THERMAL_SHUT_DOWN_2:
316 case CHGSTM_THERMAL_SHUT_DOWN_3:
317 case CHGSTM_THERMAL_SHUT_DOWN_4:
318 case CHGSTM_THERMAL_SHUT_DOWN_5:
319 case CHGSTM_THERMAL_SHUT_DOWN_6:
320 case CHGSTM_THERMAL_SHUT_DOWN_7:
321 case CHGSTM_BATTERY_ERROR:
322 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
323 break;
324
325 default:
326 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
327 break;
328 }
329 break;
330
331 case POWER_SUPPLY_PROP_MANUFACTURER:
332 val->strval = BD9995X_MANUFACTURER;
333 break;
334
335 case POWER_SUPPLY_PROP_ONLINE:
336 val->intval = state.online;
337 break;
338
339 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
340 ret = regmap_field_read(bd->rmap_fields[F_IBATP_VAL], &tmp);
341 if (ret)
342 return ret;
343 val->intval = tmp * 1000;
344 break;
345
346 case POWER_SUPPLY_PROP_CHARGE_AVG:
347 ret = regmap_field_read(bd->rmap_fields[F_IBATP_AVE_VAL], &tmp);
348 if (ret)
349 return ret;
350 val->intval = tmp * 1000;
351 break;
352
353 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
354 /*
355 * Currently the DT uses this property to give the
356 * target current for fast-charging constant current phase.
357 * I think it is correct in a sense.
358 *
359 * Yet, this prop we read and return here is the programmed
360 * safety limit for combined input currents. This feels
361 * also correct in a sense.
362 *
363 * However, this results a mismatch to DT value and value
364 * read from sysfs.
365 */
366 ret = regmap_field_read(bd->rmap_fields[F_SEL_ILIM_VAL], &tmp);
367 if (ret)
368 return ret;
369 val->intval = tmp * 1000;
370 break;
371
372 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
373 if (!state.online) {
374 val->intval = 0;
375 break;
376 }
377
378 ret = regmap_field_read(bd->rmap_fields[F_VFASTCHG_REG_SET1],
379 &tmp);
380 if (ret)
381 return ret;
382
383 /*
384 * The actual range : 2560 to 19200 mV. No matter what the
385 * register says
386 */
387 val->intval = clamp_val(tmp << 4, 2560, 19200);
388 val->intval *= 1000;
389 break;
390
391 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
392 ret = regmap_field_read(bd->rmap_fields[F_ITERM_SET], &tmp);
393 if (ret)
394 return ret;
395 /* Start step is 64 mA */
396 val->intval = tmp << 6;
397 /* Maximum is 1024 mA - no matter what register says */
398 val->intval = min(val->intval, 1024);
399 val->intval *= 1000;
400 break;
401
402 /* Battery properties which we access through charger */
403 case POWER_SUPPLY_PROP_PRESENT:
404 val->intval = bd9995x_get_prop_batt_present(bd);
405 break;
406
407 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
408 val->intval = bd9995x_get_prop_batt_voltage(bd);
409 break;
410
411 case POWER_SUPPLY_PROP_CURRENT_NOW:
412 val->intval = bd9995x_get_prop_batt_current(bd);
413 break;
414
415 case POWER_SUPPLY_PROP_CHARGE_TYPE:
416 val->intval = bd9995x_get_prop_charge_type(bd);
417 break;
418
419 case POWER_SUPPLY_PROP_HEALTH:
420 val->intval = bd9995x_get_prop_batt_health(bd);
421 break;
422
423 case POWER_SUPPLY_PROP_TEMP:
424 val->intval = bd9995x_get_prop_batt_temp(bd);
425 break;
426
427 case POWER_SUPPLY_PROP_TECHNOLOGY:
428 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
429 break;
430
431 case POWER_SUPPLY_PROP_MODEL_NAME:
432 val->strval = "bd99954";
433 break;
434
435 default:
436 return -EINVAL;
437
438 }
439
440 return 0;
441 }
442
bd9995x_get_chip_state(struct bd9995x_device * bd,struct bd9995x_state * state)443 static int bd9995x_get_chip_state(struct bd9995x_device *bd,
444 struct bd9995x_state *state)
445 {
446 int i, ret, tmp;
447 struct {
448 struct regmap_field *id;
449 u16 *data;
450 } state_fields[] = {
451 {
452 bd->rmap_fields[F_CHGSTM_STATE], &state->chgstm_status,
453 }, {
454 bd->rmap_fields[F_VBAT_VSYS_STATUS],
455 &state->vbat_vsys_status,
456 }, {
457 bd->rmap_fields[F_VBUS_VCC_STATUS],
458 &state->vbus_vcc_status,
459 },
460 };
461
462
463 for (i = 0; i < ARRAY_SIZE(state_fields); i++) {
464 ret = regmap_field_read(state_fields[i].id, &tmp);
465 if (ret)
466 return ret;
467
468 *state_fields[i].data = tmp;
469 }
470
471 if (state->vbus_vcc_status & STATUS_VCC_DET ||
472 state->vbus_vcc_status & STATUS_VBUS_DET)
473 state->online = 1;
474 else
475 state->online = 0;
476
477 return 0;
478 }
479
bd9995x_irq_handler_thread(int irq,void * private)480 static irqreturn_t bd9995x_irq_handler_thread(int irq, void *private)
481 {
482 struct bd9995x_device *bd = private;
483 int ret, status, mask, i;
484 unsigned long tmp;
485 struct bd9995x_state state;
486
487 /*
488 * The bd9995x does not seem to generate big amount of interrupts.
489 * The logic regarding which interrupts can cause relevant
490 * status changes seem to be pretty complex.
491 *
492 * So lets implement really simple and hopefully bullet-proof handler:
493 * It does not really matter which IRQ we handle, we just go and
494 * re-read all interesting statuses + give the framework a nudge.
495 *
496 * Other option would be building a _complex_ and error prone logic
497 * trying to decide what could have been changed (resulting this IRQ
498 * we are now handling). During the normal operation the BD99954 does
499 * not seem to be generating much of interrupts so benefit from such
500 * logic would probably be minimal.
501 */
502
503 ret = regmap_read(bd->rmap, INT0_STATUS, &status);
504 if (ret) {
505 dev_err(bd->dev, "Failed to read IRQ status\n");
506 return IRQ_NONE;
507 }
508
509 ret = regmap_field_read(bd->rmap_fields[F_INT0_SET], &mask);
510 if (ret) {
511 dev_err(bd->dev, "Failed to read IRQ mask\n");
512 return IRQ_NONE;
513 }
514
515 /* Handle only IRQs that are not masked */
516 status &= mask;
517 tmp = status;
518
519 /* Lowest bit does not represent any sub-registers */
520 tmp >>= 1;
521
522 /*
523 * Mask and ack IRQs we will handle (+ the idiot bit)
524 */
525 ret = regmap_field_write(bd->rmap_fields[F_INT0_SET], 0);
526 if (ret) {
527 dev_err(bd->dev, "Failed to mask F_INT0\n");
528 return IRQ_NONE;
529 }
530
531 ret = regmap_write(bd->rmap, INT0_STATUS, status);
532 if (ret) {
533 dev_err(bd->dev, "Failed to ack F_INT0\n");
534 goto err_umask;
535 }
536
537 for_each_set_bit(i, &tmp, 7) {
538 int sub_status, sub_mask;
539 static const int sub_status_reg[] = {
540 INT1_STATUS, INT2_STATUS, INT3_STATUS, INT4_STATUS,
541 INT5_STATUS, INT6_STATUS, INT7_STATUS,
542 };
543 struct regmap_field *sub_mask_f[] = {
544 bd->rmap_fields[F_INT1_SET],
545 bd->rmap_fields[F_INT2_SET],
546 bd->rmap_fields[F_INT3_SET],
547 bd->rmap_fields[F_INT4_SET],
548 bd->rmap_fields[F_INT5_SET],
549 bd->rmap_fields[F_INT6_SET],
550 bd->rmap_fields[F_INT7_SET],
551 };
552
553 /* Clear sub IRQs */
554 ret = regmap_read(bd->rmap, sub_status_reg[i], &sub_status);
555 if (ret) {
556 dev_err(bd->dev, "Failed to read IRQ sub-status\n");
557 goto err_umask;
558 }
559
560 ret = regmap_field_read(sub_mask_f[i], &sub_mask);
561 if (ret) {
562 dev_err(bd->dev, "Failed to read IRQ sub-mask\n");
563 goto err_umask;
564 }
565
566 /* Ack active sub-statuses */
567 sub_status &= sub_mask;
568
569 ret = regmap_write(bd->rmap, sub_status_reg[i], sub_status);
570 if (ret) {
571 dev_err(bd->dev, "Failed to ack sub-IRQ\n");
572 goto err_umask;
573 }
574 }
575
576 ret = regmap_field_write(bd->rmap_fields[F_INT0_SET], mask);
577 if (ret)
578 /* May as well retry once */
579 goto err_umask;
580
581 /* Read whole chip state */
582 ret = bd9995x_get_chip_state(bd, &state);
583 if (ret < 0) {
584 dev_err(bd->dev, "Failed to read chip state\n");
585 } else {
586 mutex_lock(&bd->lock);
587 bd->state = state;
588 mutex_unlock(&bd->lock);
589
590 power_supply_changed(bd->charger);
591 }
592
593 return IRQ_HANDLED;
594
595 err_umask:
596 ret = regmap_field_write(bd->rmap_fields[F_INT0_SET], mask);
597 if (ret)
598 dev_err(bd->dev,
599 "Failed to un-mask F_INT0 - IRQ permanently disabled\n");
600
601 return IRQ_NONE;
602 }
603
__bd9995x_chip_reset(struct bd9995x_device * bd)604 static int __bd9995x_chip_reset(struct bd9995x_device *bd)
605 {
606 int ret, state;
607 int rst_check_counter = 10;
608 u16 tmp = ALLRST | OTPLD;
609
610 ret = regmap_raw_write(bd->rmap, SYSTEM_CTRL_SET, &tmp, 2);
611 if (ret < 0)
612 return ret;
613
614 do {
615 ret = regmap_field_read(bd->rmap_fields[F_OTPLD_STATE], &state);
616 if (ret)
617 return ret;
618
619 msleep(10);
620 } while (state == 0 && --rst_check_counter);
621
622 if (!rst_check_counter) {
623 dev_err(bd->dev, "chip reset not completed\n");
624 return -ETIMEDOUT;
625 }
626
627 tmp = 0;
628 ret = regmap_raw_write(bd->rmap, SYSTEM_CTRL_SET, &tmp, 2);
629
630 return ret;
631 }
632
bd9995x_hw_init(struct bd9995x_device * bd)633 static int bd9995x_hw_init(struct bd9995x_device *bd)
634 {
635 int ret;
636 int i;
637 struct bd9995x_state state;
638 struct bd9995x_init_data *id = &bd->init_data;
639
640 const struct {
641 enum bd9995x_fields id;
642 u16 value;
643 } init_data[] = {
644 /* Enable the charging trigger after SDP charger attached */
645 {F_SDP_CHG_TRIG_EN, 1},
646 /* Enable charging trigger after SDP charger attached */
647 {F_SDP_CHG_TRIG, 1},
648 /* Disable charging trigger by BC1.2 detection */
649 {F_VBUS_BC_DISEN, 1},
650 /* Disable charging trigger by BC1.2 detection */
651 {F_VCC_BC_DISEN, 1},
652 /* Disable automatic limitation of the input current */
653 {F_ILIM_AUTO_DISEN, 1},
654 /* Select current limitation when SDP charger attached*/
655 {F_SDP_500_SEL, 1},
656 /* Select current limitation when DCP charger attached */
657 {F_DCP_2500_SEL, 1},
658 {F_VSYSREG_SET, id->vsysreg_set},
659 /* Activate USB charging and DC/DC converter */
660 {F_USB_SUS, 0},
661 /* DCDC clock: 1200 kHz*/
662 {F_DCDC_CLK_SEL, 3},
663 /* Enable charging */
664 {F_CHG_EN, 1},
665 /* Disable Input current Limit setting voltage measurement */
666 {F_EXTIADPEN, 0},
667 /* Disable input current limiting */
668 {F_VSYS_PRIORITY, 1},
669 {F_IBUS_LIM_SET, id->ibus_lim_set},
670 {F_ICC_LIM_SET, id->icc_lim_set},
671 /* Charge Termination Current Setting to 0*/
672 {F_ITERM_SET, id->iterm_set},
673 /* Trickle-charge Current Setting */
674 {F_ITRICH_SET, id->itrich_set},
675 /* Pre-charge Current setting */
676 {F_IPRECH_SET, id->iprech_set},
677 /* Fast Charge Current for constant current phase */
678 {F_ICHG_SET, id->ichg_set},
679 /* Fast Charge Voltage Regulation Setting */
680 {F_VFASTCHG_REG_SET1, id->vfastchg_reg_set1},
681 /* Set Pre-charge Voltage Threshold for trickle charging. */
682 {F_VPRECHG_TH_SET, id->vprechg_th_set},
683 {F_VRECHG_SET, id->vrechg_set},
684 {F_VBATOVP_SET, id->vbatovp_set},
685 /* Reverse buck boost voltage Setting */
686 {F_VRBOOST_SET, 0},
687 /* Disable fast-charging watchdog */
688 {F_WDT_FST, 0},
689 /* Disable pre-charging watchdog */
690 {F_WDT_PRE, 0},
691 /* Power save off */
692 {F_POWER_SAVE_MODE, 0},
693 {F_INT1_SET, INT1_ALL},
694 {F_INT2_SET, INT2_ALL},
695 {F_INT3_SET, INT3_ALL},
696 {F_INT4_SET, INT4_ALL},
697 {F_INT5_SET, INT5_ALL},
698 {F_INT6_SET, INT6_ALL},
699 {F_INT7_SET, INT7_ALL},
700 };
701
702 /*
703 * Currently we initialize charger to a known state at startup.
704 * If we want to allow for example the boot code to initialize
705 * charger we should get rid of this.
706 */
707 ret = __bd9995x_chip_reset(bd);
708 if (ret < 0)
709 return ret;
710
711 /* Initialize currents/voltages and other parameters */
712 for (i = 0; i < ARRAY_SIZE(init_data); i++) {
713 ret = regmap_field_write(bd->rmap_fields[init_data[i].id],
714 init_data[i].value);
715 if (ret) {
716 dev_err(bd->dev, "failed to initialize charger (%d)\n",
717 ret);
718 return ret;
719 }
720 }
721
722 ret = bd9995x_get_chip_state(bd, &state);
723 if (ret < 0)
724 return ret;
725
726 mutex_lock(&bd->lock);
727 bd->state = state;
728 mutex_unlock(&bd->lock);
729
730 return 0;
731 }
732
733 static enum power_supply_property bd9995x_power_supply_props[] = {
734 POWER_SUPPLY_PROP_MANUFACTURER,
735 POWER_SUPPLY_PROP_STATUS,
736 POWER_SUPPLY_PROP_ONLINE,
737 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
738 POWER_SUPPLY_PROP_CHARGE_AVG,
739 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
740 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
741 POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
742 /* Battery props we access through charger */
743 POWER_SUPPLY_PROP_PRESENT,
744 POWER_SUPPLY_PROP_VOLTAGE_NOW,
745 POWER_SUPPLY_PROP_CURRENT_NOW,
746 POWER_SUPPLY_PROP_CHARGE_TYPE,
747 POWER_SUPPLY_PROP_HEALTH,
748 POWER_SUPPLY_PROP_TEMP,
749 POWER_SUPPLY_PROP_TECHNOLOGY,
750 POWER_SUPPLY_PROP_MODEL_NAME,
751 };
752
753 static const struct power_supply_desc bd9995x_power_supply_desc = {
754 .name = "bd9995x-charger",
755 .type = POWER_SUPPLY_TYPE_USB,
756 .properties = bd9995x_power_supply_props,
757 .num_properties = ARRAY_SIZE(bd9995x_power_supply_props),
758 .get_property = bd9995x_power_supply_get_property,
759 };
760
761 /*
762 * Limit configurations for vbus-input-current and vcc-vacp-input-current
763 * Minimum limit is 0 uA. Max is 511 * 32000 uA = 16352000 uA. This is
764 * configured by writing a register so that each increment in register
765 * value equals to 32000 uA limit increment.
766 *
767 * Eg, value 0x0 is limit 0, value 0x1 is limit 32000, ...
768 * Describe the setting in linear_range table.
769 */
770 static const struct linear_range input_current_limit_ranges[] = {
771 LINEAR_RANGE(0, 0x0, 0x1ff, 32000),
772 };
773
774 /* Possible trickle, pre-charging and termination current values */
775 static const struct linear_range charging_current_ranges[] = {
776 LINEAR_RANGE(0, 0x0, 0x10, 64000),
777 LINEAR_RANGE(1024000, 0x11, 0x1f, 0),
778 };
779
780 /*
781 * Fast charging voltage regulation, starting re-charging limit
782 * and battery over voltage protection have same possible values
783 */
784 static const struct linear_range charge_voltage_regulation_ranges[] = {
785 LINEAR_RANGE(2560000, 0, 0xA0, 0),
786 LINEAR_RANGE(2560000, 0xA0, 0x4B0, 16000),
787 LINEAR_RANGE(19200000, 0x4B0, 0x7FF, 0),
788 };
789
790 /* Possible VSYS voltage regulation values */
791 static const struct linear_range vsys_voltage_regulation_ranges[] = {
792 LINEAR_RANGE(2560000, 0, 0x28, 0),
793 LINEAR_RANGE(2560000, 0x28, 0x12C, 64000),
794 LINEAR_RANGE(19200000, 0x12C, 0x1FF, 0),
795 };
796
797 /* Possible settings for switching from trickle to pre-charging limits */
798 static const struct linear_range trickle_to_pre_threshold_ranges[] = {
799 LINEAR_RANGE(2048000, 0, 0x20, 0),
800 LINEAR_RANGE(2048000, 0x20, 0x12C, 64000),
801 LINEAR_RANGE(19200000, 0x12C, 0x1FF, 0),
802 };
803
804 /* Possible current values for fast-charging constant current phase */
805 static const struct linear_range fast_charge_current_ranges[] = {
806 LINEAR_RANGE(0, 0, 0xFF, 64000),
807 };
808
809 struct battery_init {
810 const char *name;
811 int *info_data;
812 const struct linear_range *range;
813 int ranges;
814 u16 *data;
815 };
816
817 struct dt_init {
818 char *prop;
819 const struct linear_range *range;
820 int ranges;
821 u16 *data;
822 };
823
bd9995x_fw_probe(struct bd9995x_device * bd)824 static int bd9995x_fw_probe(struct bd9995x_device *bd)
825 {
826 int ret;
827 struct power_supply_battery_info *info;
828 u32 property;
829 int i;
830 int regval;
831 bool found;
832 struct bd9995x_init_data *init = &bd->init_data;
833 struct battery_init battery_inits[] = {
834 {
835 .name = "trickle-charging current",
836 .range = &charging_current_ranges[0],
837 .ranges = 2,
838 .data = &init->itrich_set,
839 }, {
840 .name = "pre-charging current",
841 .range = &charging_current_ranges[0],
842 .ranges = 2,
843 .data = &init->iprech_set,
844 }, {
845 .name = "pre-to-trickle charge voltage threshold",
846 .range = &trickle_to_pre_threshold_ranges[0],
847 .ranges = 2,
848 .data = &init->vprechg_th_set,
849 }, {
850 .name = "charging termination current",
851 .range = &charging_current_ranges[0],
852 .ranges = 2,
853 .data = &init->iterm_set,
854 }, {
855 .name = "charging re-start voltage",
856 .range = &charge_voltage_regulation_ranges[0],
857 .ranges = 2,
858 .data = &init->vrechg_set,
859 }, {
860 .name = "battery overvoltage limit",
861 .range = &charge_voltage_regulation_ranges[0],
862 .ranges = 2,
863 .data = &init->vbatovp_set,
864 }, {
865 .name = "fast-charging max current",
866 .range = &fast_charge_current_ranges[0],
867 .ranges = 1,
868 .data = &init->ichg_set,
869 }, {
870 .name = "fast-charging voltage",
871 .range = &charge_voltage_regulation_ranges[0],
872 .ranges = 2,
873 .data = &init->vfastchg_reg_set1,
874 },
875 };
876 struct dt_init props[] = {
877 {
878 .prop = "rohm,vsys-regulation-microvolt",
879 .range = &vsys_voltage_regulation_ranges[0],
880 .ranges = 2,
881 .data = &init->vsysreg_set,
882 }, {
883 .prop = "rohm,vbus-input-current-limit-microamp",
884 .range = &input_current_limit_ranges[0],
885 .ranges = 1,
886 .data = &init->ibus_lim_set,
887 }, {
888 .prop = "rohm,vcc-input-current-limit-microamp",
889 .range = &input_current_limit_ranges[0],
890 .ranges = 1,
891 .data = &init->icc_lim_set,
892 },
893 };
894
895 /*
896 * The power_supply_get_battery_info() does not support getting values
897 * from ACPI. Let's fix it if ACPI is required here.
898 */
899 ret = power_supply_get_battery_info(bd->charger, &info);
900 if (ret < 0)
901 return ret;
902
903 /* Put pointers to the generic battery info */
904 battery_inits[0].info_data = &info->tricklecharge_current_ua;
905 battery_inits[1].info_data = &info->precharge_current_ua;
906 battery_inits[2].info_data = &info->precharge_voltage_max_uv;
907 battery_inits[3].info_data = &info->charge_term_current_ua;
908 battery_inits[4].info_data = &info->charge_restart_voltage_uv;
909 battery_inits[5].info_data = &info->overvoltage_limit_uv;
910 battery_inits[6].info_data = &info->constant_charge_current_max_ua;
911 battery_inits[7].info_data = &info->constant_charge_voltage_max_uv;
912
913 for (i = 0; i < ARRAY_SIZE(battery_inits); i++) {
914 int val = *battery_inits[i].info_data;
915 const struct linear_range *range = battery_inits[i].range;
916 int ranges = battery_inits[i].ranges;
917
918 if (val == -EINVAL)
919 continue;
920
921 ret = linear_range_get_selector_low_array(range, ranges, val,
922 ®val, &found);
923 if (ret) {
924 dev_err(bd->dev, "Unsupported value for %s\n",
925 battery_inits[i].name);
926
927 power_supply_put_battery_info(bd->charger, info);
928 return -EINVAL;
929 }
930 if (!found) {
931 dev_warn(bd->dev,
932 "Unsupported value for %s - using smaller\n",
933 battery_inits[i].name);
934 }
935 *(battery_inits[i].data) = regval;
936 }
937
938 power_supply_put_battery_info(bd->charger, info);
939
940 for (i = 0; i < ARRAY_SIZE(props); i++) {
941 ret = device_property_read_u32(bd->dev, props[i].prop,
942 &property);
943 if (ret < 0) {
944 dev_err(bd->dev, "failed to read %s", props[i].prop);
945
946 return ret;
947 }
948
949 ret = linear_range_get_selector_low_array(props[i].range,
950 props[i].ranges,
951 property, ®val,
952 &found);
953 if (ret) {
954 dev_err(bd->dev, "Unsupported value for '%s'\n",
955 props[i].prop);
956
957 return -EINVAL;
958 }
959
960 if (!found) {
961 dev_warn(bd->dev,
962 "Unsupported value for '%s' - using smaller\n",
963 props[i].prop);
964 }
965
966 *(props[i].data) = regval;
967 }
968
969 return 0;
970 }
971
bd9995x_chip_reset(void * bd)972 static void bd9995x_chip_reset(void *bd)
973 {
974 __bd9995x_chip_reset(bd);
975 }
976
bd9995x_probe(struct i2c_client * client)977 static int bd9995x_probe(struct i2c_client *client)
978 {
979 struct device *dev = &client->dev;
980 struct bd9995x_device *bd;
981 struct power_supply_config psy_cfg = {};
982 int ret;
983 int i;
984
985 bd = devm_kzalloc(dev, sizeof(*bd), GFP_KERNEL);
986 if (!bd)
987 return -ENOMEM;
988
989 bd->client = client;
990 bd->dev = dev;
991 psy_cfg.drv_data = bd;
992 psy_cfg.of_node = dev->of_node;
993
994 mutex_init(&bd->lock);
995
996 bd->rmap = devm_regmap_init_i2c(client, &bd9995x_regmap_config);
997 if (IS_ERR(bd->rmap)) {
998 dev_err(dev, "Failed to setup register access via i2c\n");
999 return PTR_ERR(bd->rmap);
1000 }
1001
1002 for (i = 0; i < ARRAY_SIZE(bd9995x_reg_fields); i++) {
1003 const struct reg_field *reg_fields = bd9995x_reg_fields;
1004
1005 bd->rmap_fields[i] = devm_regmap_field_alloc(dev, bd->rmap,
1006 reg_fields[i]);
1007 if (IS_ERR(bd->rmap_fields[i])) {
1008 dev_err(dev, "cannot allocate regmap field\n");
1009 return PTR_ERR(bd->rmap_fields[i]);
1010 }
1011 }
1012
1013 i2c_set_clientdata(client, bd);
1014
1015 ret = regmap_field_read(bd->rmap_fields[F_CHIP_ID], &bd->chip_id);
1016 if (ret) {
1017 dev_err(dev, "Cannot read chip ID.\n");
1018 return ret;
1019 }
1020
1021 if (bd->chip_id != BD99954_ID) {
1022 dev_err(dev, "Chip with ID=0x%x, not supported!\n",
1023 bd->chip_id);
1024 return -ENODEV;
1025 }
1026
1027 ret = regmap_field_read(bd->rmap_fields[F_CHIP_REV], &bd->chip_rev);
1028 if (ret) {
1029 dev_err(dev, "Cannot read revision.\n");
1030 return ret;
1031 }
1032
1033 dev_info(bd->dev, "Found BD99954 chip rev %d\n", bd->chip_rev);
1034
1035 /*
1036 * We need to init the psy before we can call
1037 * power_supply_get_battery_info() for it
1038 */
1039 bd->charger = devm_power_supply_register(bd->dev,
1040 &bd9995x_power_supply_desc,
1041 &psy_cfg);
1042 if (IS_ERR(bd->charger)) {
1043 dev_err(dev, "Failed to register power supply\n");
1044 return PTR_ERR(bd->charger);
1045 }
1046
1047 ret = bd9995x_fw_probe(bd);
1048 if (ret < 0) {
1049 dev_err(dev, "Cannot read device properties.\n");
1050 return ret;
1051 }
1052
1053 ret = bd9995x_hw_init(bd);
1054 if (ret < 0) {
1055 dev_err(dev, "Cannot initialize the chip.\n");
1056 return ret;
1057 }
1058
1059 ret = devm_add_action_or_reset(dev, bd9995x_chip_reset, bd);
1060 if (ret)
1061 return ret;
1062
1063 return devm_request_threaded_irq(dev, client->irq, NULL,
1064 bd9995x_irq_handler_thread,
1065 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
1066 BD9995X_IRQ_PIN, bd);
1067 }
1068
1069 static const struct of_device_id bd9995x_of_match[] = {
1070 { .compatible = "rohm,bd99954", },
1071 { }
1072 };
1073 MODULE_DEVICE_TABLE(of, bd9995x_of_match);
1074
1075 static struct i2c_driver bd9995x_driver = {
1076 .driver = {
1077 .name = "bd9995x-charger",
1078 .of_match_table = bd9995x_of_match,
1079 },
1080 .probe = bd9995x_probe,
1081 };
1082 module_i2c_driver(bd9995x_driver);
1083
1084 MODULE_AUTHOR("Laine Markus <markus.laine@fi.rohmeurope.com>");
1085 MODULE_DESCRIPTION("ROHM BD99954 charger driver");
1086 MODULE_LICENSE("GPL");
1087