1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Charger Driver for Rockchip rk817
4 *
5 * Copyright (c) 2021 Maya Matuszczyk <maccraft123mc@gmail.com>
6 *
7 * Authors: Maya Matuszczyk <maccraft123mc@gmail.com>
8 * Chris Morgan <macromorgan@hotmail.com>
9 */
10
11 #include <linux/unaligned.h>
12 #include <linux/devm-helpers.h>
13 #include <linux/mfd/rk808.h>
14 #include <linux/irq.h>
15 #include <linux/of.h>
16 #include <linux/platform_device.h>
17 #include <linux/power_supply.h>
18 #include <linux/regmap.h>
19
20 /* Charging statuses reported by hardware register */
21 enum rk817_charge_status {
22 CHRG_OFF,
23 DEAD_CHRG,
24 TRICKLE_CHRG,
25 CC_OR_CV_CHRG,
26 CHARGE_FINISH,
27 USB_OVER_VOL,
28 BAT_TMP_ERR,
29 BAT_TIM_ERR,
30 };
31
32 /*
33 * Max charging current read to/written from hardware register.
34 * Note how highest value corresponding to 0x7 is the lowest
35 * current, this is per the datasheet.
36 */
37 enum rk817_chg_cur {
38 CHG_1A,
39 CHG_1_5A,
40 CHG_2A,
41 CHG_2_5A,
42 CHG_2_75A,
43 CHG_3A,
44 CHG_3_5A,
45 CHG_0_5A,
46 };
47
48 struct rk817_charger {
49 struct device *dev;
50 struct rk808 *rk808;
51
52 struct power_supply *bat_ps;
53 struct power_supply *chg_ps;
54 bool plugged_in;
55 bool battery_present;
56
57 /*
58 * voltage_k and voltage_b values are used to calibrate the ADC
59 * voltage readings. While they are documented in the BSP kernel and
60 * datasheet as voltage_k and voltage_b, there is no further
61 * information explaining them in more detail.
62 */
63
64 uint32_t voltage_k;
65 uint32_t voltage_b;
66
67 /*
68 * soc - state of charge - like the BSP this is stored as a percentage,
69 * to the thousandth. BSP has a display state of charge (dsoc) and a
70 * remaining state of charge (rsoc). This value will be used for both
71 * purposes here so we don't do any fancy math to try and "smooth" the
72 * charge and just report it as it is. Note for example an soc of 100
73 * is stored as 100000, an soc of 50 is stored as 50000, etc.
74 */
75 int soc;
76
77 /*
78 * Capacity of battery when fully charged, equal or less than design
79 * capacity depending upon wear. BSP kernel saves to nvram in mAh,
80 * so this value is in mAh not the standard uAh.
81 */
82 int fcc_mah;
83
84 /*
85 * Calibrate the SOC on a fully charged battery, this way we can use
86 * the calibrated SOC value to correct for columb counter drift.
87 */
88 bool soc_cal;
89
90 /* Implementation specific immutable properties from device tree */
91 int res_div;
92 int sleep_enter_current_ua;
93 int sleep_filter_current_ua;
94 int bat_charge_full_design_uah;
95 int bat_voltage_min_design_uv;
96 int bat_voltage_max_design_uv;
97
98 /* Values updated periodically by driver for display. */
99 int charge_now_uah;
100 int volt_avg_uv;
101 int cur_avg_ua;
102 int max_chg_cur_ua;
103 int max_chg_volt_uv;
104 int charge_status;
105 int charger_input_volt_avg_uv;
106
107 /* Work queue to periodically update values. */
108 struct delayed_work work;
109 };
110
111 /* ADC coefficients extracted from BSP kernel */
112 #define ADC_TO_CURRENT(adc_value, res_div) \
113 (adc_value * 172 / res_div)
114
115 #define CURRENT_TO_ADC(current, samp_res) \
116 (current * samp_res / 172)
117
118 #define CHARGE_TO_ADC(capacity, res_div) \
119 (capacity * res_div * 3600 / 172 * 1000)
120
121 #define ADC_TO_CHARGE_UAH(adc_value, res_div) \
122 (adc_value / 3600 * 172 / res_div)
123
rk817_chg_cur_to_reg(u32 chg_cur_ma)124 static int rk817_chg_cur_to_reg(u32 chg_cur_ma)
125 {
126 if (chg_cur_ma >= 3500)
127 return CHG_3_5A;
128 else if (chg_cur_ma >= 3000)
129 return CHG_3A;
130 else if (chg_cur_ma >= 2750)
131 return CHG_2_75A;
132 else if (chg_cur_ma >= 2500)
133 return CHG_2_5A;
134 else if (chg_cur_ma >= 2000)
135 return CHG_2A;
136 else if (chg_cur_ma >= 1500)
137 return CHG_1_5A;
138 else if (chg_cur_ma >= 1000)
139 return CHG_1A;
140 else if (chg_cur_ma >= 500)
141 return CHG_0_5A;
142 else
143 return -EINVAL;
144 }
145
rk817_chg_cur_from_reg(u8 reg)146 static int rk817_chg_cur_from_reg(u8 reg)
147 {
148 switch (reg) {
149 case CHG_0_5A:
150 return 500000;
151 case CHG_1A:
152 return 1000000;
153 case CHG_1_5A:
154 return 1500000;
155 case CHG_2A:
156 return 2000000;
157 case CHG_2_5A:
158 return 2500000;
159 case CHG_2_75A:
160 return 2750000;
161 case CHG_3A:
162 return 3000000;
163 case CHG_3_5A:
164 return 3500000;
165 default:
166 return -EINVAL;
167 }
168 }
169
rk817_bat_calib_vol(struct rk817_charger * charger)170 static void rk817_bat_calib_vol(struct rk817_charger *charger)
171 {
172 uint32_t vcalib0 = 0;
173 uint32_t vcalib1 = 0;
174 u8 bulk_reg[2];
175
176 /* calibrate voltage */
177 regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_VCALIB0_H,
178 bulk_reg, 2);
179 vcalib0 = get_unaligned_be16(bulk_reg);
180
181 regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_VCALIB1_H,
182 bulk_reg, 2);
183 vcalib1 = get_unaligned_be16(bulk_reg);
184
185 /* values were taken from BSP kernel */
186 charger->voltage_k = (4025 - 2300) * 1000 /
187 ((vcalib1 - vcalib0) ? (vcalib1 - vcalib0) : 1);
188 charger->voltage_b = 4025 - (charger->voltage_k * vcalib1) / 1000;
189 }
190
rk817_bat_calib_cur(struct rk817_charger * charger)191 static void rk817_bat_calib_cur(struct rk817_charger *charger)
192 {
193 u8 bulk_reg[2];
194
195 /* calibrate current */
196 regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_IOFFSET_H,
197 bulk_reg, 2);
198 regmap_bulk_write(charger->rk808->regmap, RK817_GAS_GAUGE_CAL_OFFSET_H,
199 bulk_reg, 2);
200 }
201
202 /*
203 * note that only the fcc_mah is really used by this driver, the other values
204 * are to ensure we can remain backwards compatible with the BSP kernel.
205 */
rk817_record_battery_nvram_values(struct rk817_charger * charger)206 static int rk817_record_battery_nvram_values(struct rk817_charger *charger)
207 {
208 u8 bulk_reg[3];
209 int ret, rsoc;
210
211 /*
212 * write the soc value to the nvram location used by the BSP kernel
213 * for the dsoc value.
214 */
215 put_unaligned_le24(charger->soc, bulk_reg);
216 ret = regmap_bulk_write(charger->rk808->regmap, RK817_GAS_GAUGE_BAT_R1,
217 bulk_reg, 3);
218 if (ret < 0)
219 return ret;
220 /*
221 * write the remaining capacity in mah to the nvram location used by
222 * the BSP kernel for the rsoc value.
223 */
224 rsoc = (charger->soc * charger->fcc_mah) / 100000;
225 put_unaligned_le24(rsoc, bulk_reg);
226 ret = regmap_bulk_write(charger->rk808->regmap, RK817_GAS_GAUGE_DATA0,
227 bulk_reg, 3);
228 if (ret < 0)
229 return ret;
230 /* write the fcc_mah in mAh, just as the BSP kernel does. */
231 put_unaligned_le24(charger->fcc_mah, bulk_reg);
232 ret = regmap_bulk_write(charger->rk808->regmap, RK817_GAS_GAUGE_DATA3,
233 bulk_reg, 3);
234 if (ret < 0)
235 return ret;
236
237 return 0;
238 }
239
rk817_bat_calib_cap(struct rk817_charger * charger)240 static int rk817_bat_calib_cap(struct rk817_charger *charger)
241 {
242 struct rk808 *rk808 = charger->rk808;
243 int tmp, charge_now, charge_now_adc, volt_avg;
244 u8 bulk_reg[4];
245
246 /* Calibrate the soc and fcc on a fully charged battery */
247
248 if (charger->charge_status == CHARGE_FINISH && (!charger->soc_cal)) {
249 /*
250 * soc should be 100000 and columb counter should show the full
251 * charge capacity. Note that if the device is unplugged for a
252 * period of several days the columb counter will have a large
253 * margin of error, so setting it back to the full charge on
254 * a completed charge cycle should correct this (my device was
255 * showing 33% battery after 3 days unplugged when it should
256 * have been closer to 95% based on voltage and charge
257 * current).
258 */
259
260 charger->soc = 100000;
261 charge_now_adc = CHARGE_TO_ADC(charger->fcc_mah,
262 charger->res_div);
263 put_unaligned_be32(charge_now_adc, bulk_reg);
264 regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_Q_INIT_H3,
265 bulk_reg, 4);
266
267 charger->soc_cal = 1;
268 dev_dbg(charger->dev,
269 "Fully charged. SOC is %d, full capacity is %d\n",
270 charger->soc, charger->fcc_mah * 1000);
271 }
272
273 /*
274 * The columb counter can drift up slightly, so we should correct for
275 * it. But don't correct it until we're at 100% soc.
276 */
277 if (charger->charge_status == CHARGE_FINISH && charger->soc_cal) {
278 regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
279 bulk_reg, 4);
280 charge_now_adc = get_unaligned_be32(bulk_reg);
281 if (charge_now_adc < 0)
282 return charge_now_adc;
283 charge_now = ADC_TO_CHARGE_UAH(charge_now_adc,
284 charger->res_div);
285
286 /*
287 * Re-init columb counter with updated values to correct drift.
288 */
289 if (charge_now / 1000 > charger->fcc_mah) {
290 dev_dbg(charger->dev,
291 "Recalibrating columb counter to %d uah\n",
292 charge_now);
293 /*
294 * Order of operations matters here to ensure we keep
295 * enough precision until the last step to keep from
296 * making needless updates to columb counter.
297 */
298 charge_now_adc = CHARGE_TO_ADC(charger->fcc_mah,
299 charger->res_div);
300 put_unaligned_be32(charge_now_adc, bulk_reg);
301 regmap_bulk_write(rk808->regmap,
302 RK817_GAS_GAUGE_Q_INIT_H3,
303 bulk_reg, 4);
304 }
305 }
306
307 /*
308 * Calibrate the fully charged capacity when we previously had a full
309 * battery (soc_cal = 1) and are now empty (at or below minimum design
310 * voltage). If our columb counter is still positive, subtract that
311 * from our fcc value to get a calibrated fcc, and if our columb
312 * counter is negative add that to our fcc (but not to exceed our
313 * design capacity).
314 */
315 regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_BAT_VOL_H,
316 bulk_reg, 2);
317 tmp = get_unaligned_be16(bulk_reg);
318 volt_avg = (charger->voltage_k * tmp) + 1000 * charger->voltage_b;
319 if (volt_avg <= charger->bat_voltage_min_design_uv &&
320 charger->soc_cal) {
321 regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
322 bulk_reg, 4);
323 charge_now_adc = get_unaligned_be32(bulk_reg);
324 charge_now = ADC_TO_CHARGE_UAH(charge_now_adc,
325 charger->res_div);
326 /*
327 * Note, if charge_now is negative this will add it (what we
328 * want) and if it's positive this will subtract (also what
329 * we want).
330 */
331 charger->fcc_mah = charger->fcc_mah - (charge_now / 1000);
332
333 dev_dbg(charger->dev,
334 "Recalibrating full charge capacity to %d uah\n",
335 charger->fcc_mah * 1000);
336 }
337
338 /*
339 * Set the SOC to 0 if we are below the minimum system voltage.
340 */
341 if (volt_avg <= charger->bat_voltage_min_design_uv) {
342 charger->soc = 0;
343 charge_now_adc = CHARGE_TO_ADC(0, charger->res_div);
344 put_unaligned_be32(charge_now_adc, bulk_reg);
345 regmap_bulk_write(rk808->regmap,
346 RK817_GAS_GAUGE_Q_INIT_H3, bulk_reg, 4);
347 dev_warn(charger->dev,
348 "Battery voltage %d below minimum voltage %d\n",
349 volt_avg, charger->bat_voltage_min_design_uv);
350 }
351
352 rk817_record_battery_nvram_values(charger);
353
354 return 0;
355 }
356
rk817_read_props(struct rk817_charger * charger)357 static void rk817_read_props(struct rk817_charger *charger)
358 {
359 int tmp, reg;
360 u8 bulk_reg[4];
361
362 /*
363 * Recalibrate voltage and current readings if we need to BSP does both
364 * on CUR_CALIB_UPD, ignoring VOL_CALIB_UPD. Curiously enough, both
365 * documentation and the BSP show that you perform an update if bit 7
366 * is 1, but you clear the status by writing a 1 to bit 7.
367 */
368 regmap_read(charger->rk808->regmap, RK817_GAS_GAUGE_ADC_CONFIG1, ®);
369 if (reg & RK817_VOL_CUR_CALIB_UPD) {
370 rk817_bat_calib_cur(charger);
371 rk817_bat_calib_vol(charger);
372 regmap_write_bits(charger->rk808->regmap,
373 RK817_GAS_GAUGE_ADC_CONFIG1,
374 RK817_VOL_CUR_CALIB_UPD,
375 RK817_VOL_CUR_CALIB_UPD);
376 }
377
378 /* Update reported charge. */
379 regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
380 bulk_reg, 4);
381 tmp = get_unaligned_be32(bulk_reg);
382 charger->charge_now_uah = ADC_TO_CHARGE_UAH(tmp, charger->res_div);
383 if (charger->charge_now_uah < 0)
384 charger->charge_now_uah = 0;
385 if (charger->charge_now_uah > charger->fcc_mah * 1000)
386 charger->charge_now_uah = charger->fcc_mah * 1000;
387
388 /* Update soc based on reported charge. */
389 charger->soc = charger->charge_now_uah * 100 / charger->fcc_mah;
390
391 /* Update reported voltage. */
392 regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_BAT_VOL_H,
393 bulk_reg, 2);
394 tmp = get_unaligned_be16(bulk_reg);
395 charger->volt_avg_uv = (charger->voltage_k * tmp) + 1000 *
396 charger->voltage_b;
397
398 /*
399 * Update reported current. Note value from registers is a signed 16
400 * bit int.
401 */
402 regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_BAT_CUR_H,
403 bulk_reg, 2);
404 tmp = (short int)get_unaligned_be16(bulk_reg);
405 charger->cur_avg_ua = ADC_TO_CURRENT(tmp, charger->res_div);
406
407 /*
408 * Update the max charge current. This value shouldn't change, but we
409 * can read it to report what the PMIC says it is instead of simply
410 * returning the default value.
411 */
412 regmap_read(charger->rk808->regmap, RK817_PMIC_CHRG_OUT, ®);
413 charger->max_chg_cur_ua =
414 rk817_chg_cur_from_reg(reg & RK817_CHRG_CUR_SEL);
415
416 /*
417 * Update max charge voltage. Like the max charge current this value
418 * shouldn't change, but we can report what the PMIC says.
419 */
420 regmap_read(charger->rk808->regmap, RK817_PMIC_CHRG_OUT, ®);
421 charger->max_chg_volt_uv = ((((reg & RK817_CHRG_VOL_SEL) >> 4) *
422 50000) + 4100000);
423
424 /* Check if battery still present. */
425 regmap_read(charger->rk808->regmap, RK817_PMIC_CHRG_STS, ®);
426 charger->battery_present = (reg & RK817_BAT_EXS);
427
428 /* Get which type of charge we are using (if any). */
429 regmap_read(charger->rk808->regmap, RK817_PMIC_CHRG_STS, ®);
430 charger->charge_status = (reg >> 4) & 0x07;
431
432 /*
433 * Get charger input voltage. Note that on my example hardware (an
434 * Odroid Go Advance) the voltage of the power connector is measured
435 * on the register labelled USB in the datasheet; I don't know if this
436 * is how it is designed or just a quirk of the implementation. I
437 * believe this will also measure the voltage of the USB output when in
438 * OTG mode, if that is the case we may need to change this in the
439 * future to return 0 if the power supply status is offline (I can't
440 * test this with my current implementation. Also, when the voltage
441 * should be zero sometimes the ADC still shows a single bit (which
442 * would register as 20000uv). When this happens set it to 0.
443 */
444 regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_USB_VOL_H,
445 bulk_reg, 2);
446 reg = get_unaligned_be16(bulk_reg);
447 if (reg > 1) {
448 tmp = ((charger->voltage_k * reg / 1000 + charger->voltage_b) *
449 60 / 46);
450 charger->charger_input_volt_avg_uv = tmp * 1000;
451 } else {
452 charger->charger_input_volt_avg_uv = 0;
453 }
454
455 /* Calibrate battery capacity and soc. */
456 rk817_bat_calib_cap(charger);
457 }
458
rk817_bat_get_prop(struct power_supply * ps,enum power_supply_property prop,union power_supply_propval * val)459 static int rk817_bat_get_prop(struct power_supply *ps,
460 enum power_supply_property prop,
461 union power_supply_propval *val)
462 {
463 struct rk817_charger *charger = power_supply_get_drvdata(ps);
464
465 switch (prop) {
466 case POWER_SUPPLY_PROP_PRESENT:
467 val->intval = charger->battery_present;
468 break;
469 case POWER_SUPPLY_PROP_STATUS:
470 if (charger->cur_avg_ua < 0) {
471 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
472 break;
473 }
474 switch (charger->charge_status) {
475 case CHRG_OFF:
476 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
477 break;
478 /*
479 * Dead charge is documented, but not explained. I never
480 * observed it but assume it's a pre-charge for a dead
481 * battery.
482 */
483 case DEAD_CHRG:
484 case TRICKLE_CHRG:
485 case CC_OR_CV_CHRG:
486 val->intval = POWER_SUPPLY_STATUS_CHARGING;
487 break;
488 case CHARGE_FINISH:
489 val->intval = POWER_SUPPLY_STATUS_FULL;
490 break;
491 default:
492 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
493 return -EINVAL;
494
495 }
496 break;
497 case POWER_SUPPLY_PROP_CHARGE_TYPE:
498 switch (charger->charge_status) {
499 case CHRG_OFF:
500 case CHARGE_FINISH:
501 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
502 break;
503 case TRICKLE_CHRG:
504 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
505 break;
506 case DEAD_CHRG:
507 case CC_OR_CV_CHRG:
508 val->intval = POWER_SUPPLY_CHARGE_TYPE_STANDARD;
509 break;
510 default:
511 val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
512 break;
513 }
514 break;
515 case POWER_SUPPLY_PROP_CHARGE_FULL:
516 val->intval = charger->fcc_mah * 1000;
517 break;
518 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
519 val->intval = charger->bat_charge_full_design_uah;
520 break;
521 case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
522 val->intval = 0;
523 break;
524 case POWER_SUPPLY_PROP_CHARGE_NOW:
525 val->intval = charger->charge_now_uah;
526 break;
527 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
528 val->intval = charger->bat_voltage_min_design_uv;
529 break;
530 case POWER_SUPPLY_PROP_CAPACITY:
531 /* Add 500 so that values like 99999 are 100% not 99%. */
532 val->intval = (charger->soc + 500) / 1000;
533 if (val->intval > 100)
534 val->intval = 100;
535 if (val->intval < 0)
536 val->intval = 0;
537 break;
538 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
539 val->intval = charger->volt_avg_uv;
540 break;
541 case POWER_SUPPLY_PROP_CURRENT_AVG:
542 val->intval = charger->cur_avg_ua;
543 break;
544 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
545 val->intval = charger->max_chg_cur_ua;
546 break;
547 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
548 val->intval = charger->max_chg_volt_uv;
549 break;
550 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
551 val->intval = charger->bat_voltage_max_design_uv;
552 break;
553 default:
554 return -EINVAL;
555 }
556 return 0;
557 }
558
rk817_chg_get_prop(struct power_supply * ps,enum power_supply_property prop,union power_supply_propval * val)559 static int rk817_chg_get_prop(struct power_supply *ps,
560 enum power_supply_property prop,
561 union power_supply_propval *val)
562 {
563 struct rk817_charger *charger = power_supply_get_drvdata(ps);
564
565 switch (prop) {
566 case POWER_SUPPLY_PROP_ONLINE:
567 val->intval = charger->plugged_in;
568 break;
569 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
570 /* max voltage from datasheet at 5.5v (default 5.0v) */
571 val->intval = 5500000;
572 break;
573 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
574 /* min voltage from datasheet at 3.8v (default 5.0v) */
575 val->intval = 3800000;
576 break;
577 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
578 val->intval = charger->charger_input_volt_avg_uv;
579 break;
580 /*
581 * While it's possible that other implementations could use different
582 * USB types, the current implementation for this PMIC (the Odroid Go
583 * Advance) only uses a dedicated charging port with no rx/tx lines.
584 */
585 case POWER_SUPPLY_PROP_USB_TYPE:
586 val->intval = POWER_SUPPLY_USB_TYPE_DCP;
587 break;
588 default:
589 return -EINVAL;
590 }
591 return 0;
592
593 }
594
rk817_plug_in_isr(int irq,void * cg)595 static irqreturn_t rk817_plug_in_isr(int irq, void *cg)
596 {
597 struct rk817_charger *charger;
598
599 charger = (struct rk817_charger *)cg;
600 charger->plugged_in = 1;
601 power_supply_changed(charger->chg_ps);
602 power_supply_changed(charger->bat_ps);
603 /* try to recalibrate capacity if we hit full charge. */
604 charger->soc_cal = 0;
605
606 rk817_read_props(charger);
607
608 dev_dbg(charger->dev, "Power Cord Inserted\n");
609
610 return IRQ_HANDLED;
611 }
612
rk817_plug_out_isr(int irq,void * cg)613 static irqreturn_t rk817_plug_out_isr(int irq, void *cg)
614 {
615 struct rk817_charger *charger;
616 struct rk808 *rk808;
617
618 charger = (struct rk817_charger *)cg;
619 rk808 = charger->rk808;
620 charger->plugged_in = 0;
621 power_supply_changed(charger->bat_ps);
622 power_supply_changed(charger->chg_ps);
623
624 /*
625 * For some reason the bits of RK817_PMIC_CHRG_IN reset whenever the
626 * power cord is unplugged. This was not documented in the BSP kernel
627 * or the datasheet and only discovered by trial and error. Set minimum
628 * USB input voltage to 4.5v and enable USB voltage input limit.
629 */
630 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN,
631 RK817_USB_VLIM_SEL, (0x05 << 4));
632 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_VLIM_EN,
633 (0x01 << 7));
634
635 /*
636 * Set average USB input current limit to 1.5A and enable USB current
637 * input limit.
638 */
639 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN,
640 RK817_USB_ILIM_SEL, 0x03);
641 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_ILIM_EN,
642 (0x01 << 3));
643
644 rk817_read_props(charger);
645
646 dev_dbg(charger->dev, "Power Cord Removed\n");
647
648 return IRQ_HANDLED;
649 }
650
651 static enum power_supply_property rk817_bat_props[] = {
652 POWER_SUPPLY_PROP_PRESENT,
653 POWER_SUPPLY_PROP_STATUS,
654 POWER_SUPPLY_PROP_CHARGE_TYPE,
655 POWER_SUPPLY_PROP_CHARGE_FULL,
656 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
657 POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
658 POWER_SUPPLY_PROP_CHARGE_NOW,
659 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
660 POWER_SUPPLY_PROP_VOLTAGE_AVG,
661 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
662 POWER_SUPPLY_PROP_CURRENT_AVG,
663 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
664 POWER_SUPPLY_PROP_CAPACITY,
665 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
666 };
667
668 static enum power_supply_property rk817_chg_props[] = {
669 POWER_SUPPLY_PROP_ONLINE,
670 POWER_SUPPLY_PROP_USB_TYPE,
671 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
672 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
673 POWER_SUPPLY_PROP_VOLTAGE_AVG,
674 };
675
676 static const struct power_supply_desc rk817_bat_desc = {
677 .name = "rk817-battery",
678 .type = POWER_SUPPLY_TYPE_BATTERY,
679 .properties = rk817_bat_props,
680 .num_properties = ARRAY_SIZE(rk817_bat_props),
681 .get_property = rk817_bat_get_prop,
682 };
683
684 static const struct power_supply_desc rk817_chg_desc = {
685 .name = "rk817-charger",
686 .type = POWER_SUPPLY_TYPE_USB,
687 .usb_types = BIT(POWER_SUPPLY_USB_TYPE_DCP) |
688 BIT(POWER_SUPPLY_USB_TYPE_UNKNOWN),
689 .properties = rk817_chg_props,
690 .num_properties = ARRAY_SIZE(rk817_chg_props),
691 .get_property = rk817_chg_get_prop,
692 };
693
rk817_read_battery_nvram_values(struct rk817_charger * charger)694 static int rk817_read_battery_nvram_values(struct rk817_charger *charger)
695 {
696 u8 bulk_reg[3];
697 int ret;
698
699 /* Read the nvram data for full charge capacity. */
700 ret = regmap_bulk_read(charger->rk808->regmap,
701 RK817_GAS_GAUGE_DATA3, bulk_reg, 3);
702 if (ret < 0)
703 return ret;
704 charger->fcc_mah = get_unaligned_le24(bulk_reg);
705
706 /*
707 * Sanity checking for values equal to zero or less than would be
708 * practical for this device (BSP Kernel assumes 500mAH or less) for
709 * practicality purposes. Also check if the value is too large and
710 * correct it.
711 */
712 if ((charger->fcc_mah < 500) ||
713 ((charger->fcc_mah * 1000) > charger->bat_charge_full_design_uah)) {
714 dev_info(charger->dev,
715 "Invalid NVRAM max charge, setting to %u uAH\n",
716 charger->bat_charge_full_design_uah);
717 charger->fcc_mah = charger->bat_charge_full_design_uah / 1000;
718 }
719
720 /*
721 * Read the nvram for state of charge. Sanity check for values greater
722 * than 100 (10000) or less than 0, because other things (BSP kernels,
723 * U-Boot, or even i2cset) can write to this register. If the value is
724 * off it should get corrected automatically when the voltage drops to
725 * the min (soc is 0) or when the battery is full (soc is 100).
726 */
727 ret = regmap_bulk_read(charger->rk808->regmap,
728 RK817_GAS_GAUGE_BAT_R1, bulk_reg, 3);
729 if (ret < 0)
730 return ret;
731 charger->soc = get_unaligned_le24(bulk_reg);
732 if (charger->soc > 10000)
733 charger->soc = 10000;
734 if (charger->soc < 0)
735 charger->soc = 0;
736
737 return 0;
738 }
739
740 static int
rk817_read_or_set_full_charge_on_boot(struct rk817_charger * charger,struct power_supply_battery_info * bat_info)741 rk817_read_or_set_full_charge_on_boot(struct rk817_charger *charger,
742 struct power_supply_battery_info *bat_info)
743 {
744 struct rk808 *rk808 = charger->rk808;
745 u8 bulk_reg[4];
746 u32 boot_voltage, boot_charge_mah;
747 int ret, reg, off_time, tmp;
748 bool first_boot;
749
750 /*
751 * Check if the battery is uninitalized. If it is, the columb counter
752 * needs to be set up.
753 */
754 ret = regmap_read(rk808->regmap, RK817_GAS_GAUGE_GG_STS, ®);
755 if (ret < 0)
756 return ret;
757 first_boot = reg & RK817_BAT_CON;
758 /*
759 * If the battery is uninitialized, use the poweron voltage and an ocv
760 * lookup to guess our charge. The number won't be very accurate until
761 * we hit either our minimum voltage (0%) or full charge (100%).
762 */
763 if (first_boot) {
764 regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_PWRON_VOL_H,
765 bulk_reg, 2);
766 tmp = get_unaligned_be16(bulk_reg);
767 boot_voltage = (charger->voltage_k * tmp) +
768 1000 * charger->voltage_b;
769 /*
770 * Since only implementation has no working thermistor, assume
771 * 20C for OCV lookup. If lookup fails, report error with OCV
772 * table.
773 */
774 charger->soc = power_supply_batinfo_ocv2cap(bat_info,
775 boot_voltage,
776 20) * 1000;
777 if (charger->soc < 0)
778 charger->soc = 0;
779
780 /* Guess that full charge capacity is the design capacity */
781 charger->fcc_mah = charger->bat_charge_full_design_uah / 1000;
782 /*
783 * Set battery as "set up". BSP driver uses this value even
784 * though datasheet claims it's a read-only value.
785 */
786 regmap_write_bits(rk808->regmap, RK817_GAS_GAUGE_GG_STS,
787 RK817_BAT_CON, 0);
788 /* Save nvram values */
789 ret = rk817_record_battery_nvram_values(charger);
790 if (ret < 0)
791 return ret;
792 } else {
793 ret = rk817_read_battery_nvram_values(charger);
794 if (ret < 0)
795 return ret;
796
797 regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
798 bulk_reg, 4);
799 tmp = get_unaligned_be32(bulk_reg);
800 if (tmp < 0)
801 tmp = 0;
802 boot_charge_mah = ADC_TO_CHARGE_UAH(tmp,
803 charger->res_div) / 1000;
804 /*
805 * Check if the columb counter has been off for more than 30
806 * minutes as it tends to drift downward. If so, re-init soc
807 * with the boot voltage instead. Note the unit values for the
808 * OFF_CNT register appear to be in decaminutes and stops
809 * counting at 2550 (0xFF) minutes. BSP kernel used OCV, but
810 * for me occasionally that would show invalid values. Boot
811 * voltage is only accurate for me on first poweron (not
812 * reboots), but we shouldn't ever encounter an OFF_CNT more
813 * than 0 on a reboot anyway.
814 */
815 regmap_read(rk808->regmap, RK817_GAS_GAUGE_OFF_CNT, &off_time);
816 if (off_time >= 3) {
817 regmap_bulk_read(rk808->regmap,
818 RK817_GAS_GAUGE_PWRON_VOL_H,
819 bulk_reg, 2);
820 tmp = get_unaligned_be16(bulk_reg);
821 boot_voltage = (charger->voltage_k * tmp) +
822 1000 * charger->voltage_b;
823 charger->soc =
824 power_supply_batinfo_ocv2cap(bat_info,
825 boot_voltage,
826 20) * 1000;
827 } else {
828 charger->soc = (boot_charge_mah * 1000 * 100 /
829 charger->fcc_mah);
830 }
831 }
832
833 /*
834 * Now we have our full charge capacity and soc, init the columb
835 * counter.
836 */
837 boot_charge_mah = charger->soc * charger->fcc_mah / 100 / 1000;
838 if (boot_charge_mah > charger->fcc_mah)
839 boot_charge_mah = charger->fcc_mah;
840 tmp = CHARGE_TO_ADC(boot_charge_mah, charger->res_div);
841 put_unaligned_be32(tmp, bulk_reg);
842 ret = regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_Q_INIT_H3,
843 bulk_reg, 4);
844 if (ret < 0)
845 return ret;
846
847 /* Set QMAX value to max design capacity. */
848 tmp = CHARGE_TO_ADC((charger->bat_charge_full_design_uah / 1000),
849 charger->res_div);
850 put_unaligned_be32(tmp, bulk_reg);
851 ret = regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_Q_MAX_H3,
852 bulk_reg, 4);
853 if (ret < 0)
854 return ret;
855
856 return 0;
857 }
858
rk817_battery_init(struct rk817_charger * charger,struct power_supply_battery_info * bat_info)859 static int rk817_battery_init(struct rk817_charger *charger,
860 struct power_supply_battery_info *bat_info)
861 {
862 struct rk808 *rk808 = charger->rk808;
863 u32 tmp, max_chg_vol_mv, max_chg_cur_ma;
864 u8 max_chg_vol_reg, chg_term_i_reg;
865 int ret, chg_term_ma, max_chg_cur_reg;
866 u8 bulk_reg[2];
867
868 /* Get initial plug state */
869 regmap_read(rk808->regmap, RK817_SYS_STS, &tmp);
870 charger->plugged_in = (tmp & RK817_PLUG_IN_STS);
871
872 /*
873 * Turn on all ADC functions to measure battery, USB, and sys voltage,
874 * as well as batt temp. Note only tested implementation so far does
875 * not use a battery with a thermistor.
876 */
877 regmap_write(rk808->regmap, RK817_GAS_GAUGE_ADC_CONFIG0, 0xfc);
878
879 /*
880 * Set relax mode voltage sampling interval and ADC offset calibration
881 * interval to 8 minutes to mirror BSP kernel. Set voltage and current
882 * modes to average to mirror BSP kernel.
883 */
884 regmap_write(rk808->regmap, RK817_GAS_GAUGE_GG_CON, 0x04);
885
886 /* Calibrate voltage like the BSP does here. */
887 rk817_bat_calib_vol(charger);
888
889 /* Write relax threshold, derived from sleep enter current. */
890 tmp = CURRENT_TO_ADC(charger->sleep_enter_current_ua,
891 charger->res_div);
892 put_unaligned_be16(tmp, bulk_reg);
893 regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_RELAX_THRE_H,
894 bulk_reg, 2);
895
896 /* Write sleep sample current, derived from sleep filter current. */
897 tmp = CURRENT_TO_ADC(charger->sleep_filter_current_ua,
898 charger->res_div);
899 put_unaligned_be16(tmp, bulk_reg);
900 regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_SLEEP_CON_SAMP_CUR_H,
901 bulk_reg, 2);
902
903 /* Restart battery relax voltage */
904 regmap_write_bits(rk808->regmap, RK817_GAS_GAUGE_GG_STS,
905 RK817_RELAX_VOL_UPD, (0x0 << 2));
906
907 /*
908 * Set OCV Threshold Voltage to 127.5mV. This was hard coded like this
909 * in the BSP.
910 */
911 regmap_write(rk808->regmap, RK817_GAS_GAUGE_OCV_THRE_VOL, 0xff);
912
913 /*
914 * Set maximum charging voltage to battery max voltage. Trying to be
915 * incredibly safe with these value, as setting them wrong could
916 * overcharge the battery, which would be very bad.
917 */
918 max_chg_vol_mv = bat_info->constant_charge_voltage_max_uv / 1000;
919 max_chg_cur_ma = bat_info->constant_charge_current_max_ua / 1000;
920
921 if (max_chg_vol_mv < 4100) {
922 return dev_err_probe(charger->dev, -EINVAL,
923 "invalid max charger voltage, value %u unsupported\n",
924 max_chg_vol_mv * 1000);
925 }
926 if (max_chg_vol_mv > 4450) {
927 dev_info(charger->dev,
928 "Setting max charge voltage to 4450000uv\n");
929 max_chg_vol_mv = 4450;
930 }
931
932 if (max_chg_cur_ma < 500) {
933 return dev_err_probe(charger->dev, -EINVAL,
934 "invalid max charger current, value %u unsupported\n",
935 max_chg_cur_ma * 1000);
936 }
937 if (max_chg_cur_ma > 3500)
938 dev_info(charger->dev,
939 "Setting max charge current to 3500000ua\n");
940
941 /*
942 * Now that the values are sanity checked, if we subtract 4100 from the
943 * max voltage and divide by 50, we conviently get the exact value for
944 * the registers, which are 4.1v, 4.15v, 4.2v, 4.25v, 4.3v, 4.35v,
945 * 4.4v, and 4.45v; these correspond to values 0x00 through 0x07.
946 */
947 max_chg_vol_reg = (max_chg_vol_mv - 4100) / 50;
948
949 max_chg_cur_reg = rk817_chg_cur_to_reg(max_chg_cur_ma);
950
951 if (max_chg_vol_reg < 0 || max_chg_vol_reg > 7) {
952 return dev_err_probe(charger->dev, -EINVAL,
953 "invalid max charger voltage, value %u unsupported\n",
954 max_chg_vol_mv * 1000);
955 }
956 if (max_chg_cur_reg < 0 || max_chg_cur_reg > 7) {
957 return dev_err_probe(charger->dev, -EINVAL,
958 "invalid max charger current, value %u unsupported\n",
959 max_chg_cur_ma * 1000);
960 }
961
962 /*
963 * Write the values to the registers, and deliver an emergency warning
964 * in the event they are not written correctly.
965 */
966 ret = regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_OUT,
967 RK817_CHRG_VOL_SEL, (max_chg_vol_reg << 4));
968 if (ret) {
969 dev_emerg(charger->dev,
970 "Danger, unable to set max charger voltage: %u\n",
971 ret);
972 }
973
974 ret = regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_OUT,
975 RK817_CHRG_CUR_SEL, max_chg_cur_reg);
976 if (ret) {
977 dev_emerg(charger->dev,
978 "Danger, unable to set max charger current: %u\n",
979 ret);
980 }
981
982 /* Set charge finishing mode to analog */
983 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_TERM,
984 RK817_CHRG_TERM_ANA_DIG, (0x0 << 2));
985
986 /*
987 * Set charge finish current, warn if value not in range and keep
988 * default.
989 */
990 chg_term_ma = bat_info->charge_term_current_ua / 1000;
991 if (chg_term_ma < 150 || chg_term_ma > 400) {
992 dev_warn(charger->dev,
993 "Invalid charge termination %u, keeping default\n",
994 chg_term_ma * 1000);
995 chg_term_ma = 200;
996 }
997
998 /*
999 * Values of 150ma, 200ma, 300ma, and 400ma correspond to 00, 01, 10,
1000 * and 11.
1001 */
1002 chg_term_i_reg = (chg_term_ma - 100) / 100;
1003 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_TERM,
1004 RK817_CHRG_TERM_ANA_SEL, chg_term_i_reg);
1005
1006 ret = rk817_read_or_set_full_charge_on_boot(charger, bat_info);
1007 if (ret < 0)
1008 return ret;
1009
1010 /*
1011 * Set minimum USB input voltage to 4.5v and enable USB voltage input
1012 * limit.
1013 */
1014 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN,
1015 RK817_USB_VLIM_SEL, (0x05 << 4));
1016 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_VLIM_EN,
1017 (0x01 << 7));
1018
1019 /*
1020 * Set average USB input current limit to 1.5A and enable USB current
1021 * input limit.
1022 */
1023 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN,
1024 RK817_USB_ILIM_SEL, 0x03);
1025 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_ILIM_EN,
1026 (0x01 << 3));
1027
1028 return 0;
1029 }
1030
rk817_charging_monitor(struct work_struct * work)1031 static void rk817_charging_monitor(struct work_struct *work)
1032 {
1033 struct rk817_charger *charger;
1034
1035 charger = container_of(work, struct rk817_charger, work.work);
1036
1037 rk817_read_props(charger);
1038
1039 /* Run every 8 seconds like the BSP driver did. */
1040 queue_delayed_work(system_wq, &charger->work, msecs_to_jiffies(8000));
1041 }
1042
rk817_cleanup_node(void * data)1043 static void rk817_cleanup_node(void *data)
1044 {
1045 struct device_node *node = data;
1046
1047 of_node_put(node);
1048 }
1049
rk817_charger_probe(struct platform_device * pdev)1050 static int rk817_charger_probe(struct platform_device *pdev)
1051 {
1052 struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
1053 struct rk817_charger *charger;
1054 struct device_node *node;
1055 struct power_supply_battery_info *bat_info;
1056 struct device *dev = &pdev->dev;
1057 struct power_supply_config pscfg = {};
1058 int plugin_irq, plugout_irq;
1059 int of_value;
1060 int ret;
1061
1062 node = of_get_child_by_name(dev->parent->of_node, "charger");
1063 if (!node)
1064 return -ENODEV;
1065
1066 ret = devm_add_action_or_reset(&pdev->dev, rk817_cleanup_node, node);
1067 if (ret)
1068 return ret;
1069
1070 charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
1071 if (!charger)
1072 return -ENOMEM;
1073
1074 charger->rk808 = rk808;
1075
1076 charger->dev = &pdev->dev;
1077 platform_set_drvdata(pdev, charger);
1078
1079 rk817_bat_calib_vol(charger);
1080
1081 pscfg.drv_data = charger;
1082 pscfg.of_node = node;
1083
1084 /*
1085 * Get sample resistor value. Note only values of 10000 or 20000
1086 * microohms are allowed. Schematic for my test implementation (an
1087 * Odroid Go Advance) shows a 10 milliohm resistor for reference.
1088 */
1089 ret = of_property_read_u32(node, "rockchip,resistor-sense-micro-ohms",
1090 &of_value);
1091 if (ret < 0) {
1092 return dev_err_probe(dev, ret,
1093 "Error reading sample resistor value\n");
1094 }
1095 /*
1096 * Store as a 1 or a 2, since all we really use the value for is as a
1097 * divisor in some calculations.
1098 */
1099 charger->res_div = (of_value == 20000) ? 2 : 1;
1100
1101 /*
1102 * Get sleep enter current value. Not sure what this value is for
1103 * other than to help calibrate the relax threshold.
1104 */
1105 ret = of_property_read_u32(node,
1106 "rockchip,sleep-enter-current-microamp",
1107 &of_value);
1108 if (ret < 0) {
1109 return dev_err_probe(dev, ret,
1110 "Error reading sleep enter cur value\n");
1111 }
1112 charger->sleep_enter_current_ua = of_value;
1113
1114 /* Get sleep filter current value */
1115 ret = of_property_read_u32(node,
1116 "rockchip,sleep-filter-current-microamp",
1117 &of_value);
1118 if (ret < 0) {
1119 return dev_err_probe(dev, ret,
1120 "Error reading sleep filter cur value\n");
1121 }
1122
1123 charger->sleep_filter_current_ua = of_value;
1124
1125 charger->bat_ps = devm_power_supply_register(&pdev->dev,
1126 &rk817_bat_desc, &pscfg);
1127 if (IS_ERR(charger->bat_ps))
1128 return dev_err_probe(dev, -EINVAL,
1129 "Battery failed to probe\n");
1130
1131 charger->chg_ps = devm_power_supply_register(&pdev->dev,
1132 &rk817_chg_desc, &pscfg);
1133 if (IS_ERR(charger->chg_ps))
1134 return dev_err_probe(dev, -EINVAL,
1135 "Charger failed to probe\n");
1136
1137 ret = power_supply_get_battery_info(charger->bat_ps,
1138 &bat_info);
1139 if (ret) {
1140 return dev_err_probe(dev, ret,
1141 "Unable to get battery info\n");
1142 }
1143
1144 if ((bat_info->charge_full_design_uah <= 0) ||
1145 (bat_info->voltage_min_design_uv <= 0) ||
1146 (bat_info->voltage_max_design_uv <= 0) ||
1147 (bat_info->constant_charge_voltage_max_uv <= 0) ||
1148 (bat_info->constant_charge_current_max_ua <= 0) ||
1149 (bat_info->charge_term_current_ua <= 0)) {
1150 return dev_err_probe(dev, -EINVAL,
1151 "Required bat info missing or invalid\n");
1152 }
1153
1154 charger->bat_charge_full_design_uah = bat_info->charge_full_design_uah;
1155 charger->bat_voltage_min_design_uv = bat_info->voltage_min_design_uv;
1156 charger->bat_voltage_max_design_uv = bat_info->voltage_max_design_uv;
1157
1158 /*
1159 * Has to run after power_supply_get_battery_info as it depends on some
1160 * values discovered from that routine.
1161 */
1162 ret = rk817_battery_init(charger, bat_info);
1163 if (ret)
1164 return ret;
1165
1166 power_supply_put_battery_info(charger->bat_ps, bat_info);
1167
1168 plugin_irq = platform_get_irq(pdev, 0);
1169 if (plugin_irq < 0)
1170 return plugin_irq;
1171
1172 plugout_irq = platform_get_irq(pdev, 1);
1173 if (plugout_irq < 0)
1174 return plugout_irq;
1175
1176 ret = devm_request_threaded_irq(charger->dev, plugin_irq, NULL,
1177 rk817_plug_in_isr,
1178 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
1179 "rk817_plug_in", charger);
1180 if (ret) {
1181 return dev_err_probe(&pdev->dev, ret,
1182 "plug_in_irq request failed!\n");
1183 }
1184
1185 ret = devm_request_threaded_irq(charger->dev, plugout_irq, NULL,
1186 rk817_plug_out_isr,
1187 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
1188 "rk817_plug_out", charger);
1189 if (ret) {
1190 return dev_err_probe(&pdev->dev, ret,
1191 "plug_out_irq request failed!\n");
1192 }
1193
1194 ret = devm_delayed_work_autocancel(&pdev->dev, &charger->work,
1195 rk817_charging_monitor);
1196 if (ret)
1197 return ret;
1198
1199 /* Force the first update immediately. */
1200 mod_delayed_work(system_wq, &charger->work, 0);
1201
1202 return 0;
1203 }
1204
rk817_resume(struct device * dev)1205 static int __maybe_unused rk817_resume(struct device *dev)
1206 {
1207
1208 struct rk817_charger *charger = dev_get_drvdata(dev);
1209
1210 /* force an immediate update */
1211 mod_delayed_work(system_wq, &charger->work, 0);
1212
1213 return 0;
1214 }
1215
1216 static SIMPLE_DEV_PM_OPS(rk817_charger_pm, NULL, rk817_resume);
1217
1218 static struct platform_driver rk817_charger_driver = {
1219 .probe = rk817_charger_probe,
1220 .driver = {
1221 .name = "rk817-charger",
1222 .pm = &rk817_charger_pm,
1223 },
1224 };
1225 module_platform_driver(rk817_charger_driver);
1226
1227 MODULE_DESCRIPTION("Battery power supply driver for RK817 PMIC");
1228 MODULE_AUTHOR("Maya Matuszczyk <maccraft123mc@gmail.com>");
1229 MODULE_AUTHOR("Chris Morgan <macromorgan@hotmail.com>");
1230 MODULE_LICENSE("GPL");
1231 MODULE_ALIAS("platform:rk817-charger");
1232