1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Battery charger driver for Dialog Semiconductor DA9030
4 *
5 * Copyright (C) 2008 Compulab, Ltd.
6 * Mike Rapoport <mike@compulab.co.il>
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/slab.h>
11 #include <linux/init.h>
12 #include <linux/types.h>
13 #include <linux/device.h>
14 #include <linux/workqueue.h>
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/power_supply.h>
18 #include <linux/mfd/da903x.h>
19
20 #include <linux/debugfs.h>
21 #include <linux/seq_file.h>
22 #include <linux/notifier.h>
23
24 #define DA9030_FAULT_LOG 0x0a
25 #define DA9030_FAULT_LOG_OVER_TEMP (1 << 7)
26 #define DA9030_FAULT_LOG_VBAT_OVER (1 << 4)
27
28 #define DA9030_CHARGE_CONTROL 0x28
29 #define DA9030_CHRG_CHARGER_ENABLE (1 << 7)
30
31 #define DA9030_ADC_MAN_CONTROL 0x30
32 #define DA9030_ADC_TBATREF_ENABLE (1 << 5)
33 #define DA9030_ADC_LDO_INT_ENABLE (1 << 4)
34
35 #define DA9030_ADC_AUTO_CONTROL 0x31
36 #define DA9030_ADC_TBAT_ENABLE (1 << 5)
37 #define DA9030_ADC_VBAT_IN_TXON (1 << 4)
38 #define DA9030_ADC_VCH_ENABLE (1 << 3)
39 #define DA9030_ADC_ICH_ENABLE (1 << 2)
40 #define DA9030_ADC_VBAT_ENABLE (1 << 1)
41 #define DA9030_ADC_AUTO_SLEEP_ENABLE (1 << 0)
42
43 #define DA9030_VBATMON 0x32
44 #define DA9030_VBATMONTXON 0x33
45 #define DA9030_TBATHIGHP 0x34
46 #define DA9030_TBATHIGHN 0x35
47 #define DA9030_TBATLOW 0x36
48
49 #define DA9030_VBAT_RES 0x41
50 #define DA9030_VBATMIN_RES 0x42
51 #define DA9030_VBATMINTXON_RES 0x43
52 #define DA9030_ICHMAX_RES 0x44
53 #define DA9030_ICHMIN_RES 0x45
54 #define DA9030_ICHAVERAGE_RES 0x46
55 #define DA9030_VCHMAX_RES 0x47
56 #define DA9030_VCHMIN_RES 0x48
57 #define DA9030_TBAT_RES 0x49
58
59 struct da9030_adc_res {
60 uint8_t vbat_res;
61 uint8_t vbatmin_res;
62 uint8_t vbatmintxon;
63 uint8_t ichmax_res;
64 uint8_t ichmin_res;
65 uint8_t ichaverage_res;
66 uint8_t vchmax_res;
67 uint8_t vchmin_res;
68 uint8_t tbat_res;
69 uint8_t adc_in4_res;
70 uint8_t adc_in5_res;
71 };
72
73 struct da9030_battery_thresholds {
74 int tbat_low;
75 int tbat_high;
76 int tbat_restart;
77
78 int vbat_low;
79 int vbat_crit;
80 int vbat_charge_start;
81 int vbat_charge_stop;
82 int vbat_charge_restart;
83
84 int vcharge_min;
85 int vcharge_max;
86 };
87
88 struct da9030_charger {
89 struct power_supply *psy;
90 struct power_supply_desc psy_desc;
91
92 struct device *master;
93
94 struct da9030_adc_res adc;
95 struct delayed_work work;
96 unsigned int interval;
97
98 struct power_supply_info *battery_info;
99
100 struct da9030_battery_thresholds thresholds;
101
102 unsigned int charge_milliamp;
103 unsigned int charge_millivolt;
104
105 /* charger status */
106 bool chdet;
107 uint8_t fault;
108 int mA;
109 int mV;
110 bool is_on;
111
112 struct notifier_block nb;
113
114 /* platform callbacks for battery low and critical events */
115 void (*battery_low)(void);
116 void (*battery_critical)(void);
117
118 struct dentry *debug_file;
119 };
120
da9030_reg_to_mV(int reg)121 static inline int da9030_reg_to_mV(int reg)
122 {
123 return ((reg * 2650) >> 8) + 2650;
124 }
125
da9030_millivolt_to_reg(int mV)126 static inline int da9030_millivolt_to_reg(int mV)
127 {
128 return ((mV - 2650) << 8) / 2650;
129 }
130
da9030_reg_to_mA(int reg)131 static inline int da9030_reg_to_mA(int reg)
132 {
133 return ((reg * 24000) >> 8) / 15;
134 }
135
136 #ifdef CONFIG_DEBUG_FS
bat_debug_show(struct seq_file * s,void * data)137 static int bat_debug_show(struct seq_file *s, void *data)
138 {
139 struct da9030_charger *charger = s->private;
140
141 seq_printf(s, "charger is %s\n", charger->is_on ? "on" : "off");
142 if (charger->chdet) {
143 seq_printf(s, "iset = %dmA, vset = %dmV\n",
144 charger->mA, charger->mV);
145 }
146
147 seq_printf(s, "vbat_res = %d (%dmV)\n",
148 charger->adc.vbat_res,
149 da9030_reg_to_mV(charger->adc.vbat_res));
150 seq_printf(s, "vbatmin_res = %d (%dmV)\n",
151 charger->adc.vbatmin_res,
152 da9030_reg_to_mV(charger->adc.vbatmin_res));
153 seq_printf(s, "vbatmintxon = %d (%dmV)\n",
154 charger->adc.vbatmintxon,
155 da9030_reg_to_mV(charger->adc.vbatmintxon));
156 seq_printf(s, "ichmax_res = %d (%dmA)\n",
157 charger->adc.ichmax_res,
158 da9030_reg_to_mV(charger->adc.ichmax_res));
159 seq_printf(s, "ichmin_res = %d (%dmA)\n",
160 charger->adc.ichmin_res,
161 da9030_reg_to_mA(charger->adc.ichmin_res));
162 seq_printf(s, "ichaverage_res = %d (%dmA)\n",
163 charger->adc.ichaverage_res,
164 da9030_reg_to_mA(charger->adc.ichaverage_res));
165 seq_printf(s, "vchmax_res = %d (%dmV)\n",
166 charger->adc.vchmax_res,
167 da9030_reg_to_mA(charger->adc.vchmax_res));
168 seq_printf(s, "vchmin_res = %d (%dmV)\n",
169 charger->adc.vchmin_res,
170 da9030_reg_to_mV(charger->adc.vchmin_res));
171
172 return 0;
173 }
174
175 DEFINE_SHOW_ATTRIBUTE(bat_debug);
176
da9030_bat_create_debugfs(struct da9030_charger * charger)177 static struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
178 {
179 charger->debug_file = debugfs_create_file("charger", 0666, NULL,
180 charger, &bat_debug_fops);
181 return charger->debug_file;
182 }
183
da9030_bat_remove_debugfs(struct da9030_charger * charger)184 static void da9030_bat_remove_debugfs(struct da9030_charger *charger)
185 {
186 debugfs_remove(charger->debug_file);
187 }
188 #else
da9030_bat_create_debugfs(struct da9030_charger * charger)189 static inline struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
190 {
191 return NULL;
192 }
da9030_bat_remove_debugfs(struct da9030_charger * charger)193 static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger)
194 {
195 }
196 #endif
197
da9030_read_adc(struct da9030_charger * charger,struct da9030_adc_res * adc)198 static inline void da9030_read_adc(struct da9030_charger *charger,
199 struct da9030_adc_res *adc)
200 {
201 da903x_reads(charger->master, DA9030_VBAT_RES,
202 sizeof(*adc), (uint8_t *)adc);
203 }
204
da9030_charger_update_state(struct da9030_charger * charger)205 static void da9030_charger_update_state(struct da9030_charger *charger)
206 {
207 uint8_t val;
208
209 da903x_read(charger->master, DA9030_CHARGE_CONTROL, &val);
210 charger->is_on = (val & DA9030_CHRG_CHARGER_ENABLE) ? 1 : 0;
211 charger->mA = ((val >> 3) & 0xf) * 100;
212 charger->mV = (val & 0x7) * 50 + 4000;
213
214 da9030_read_adc(charger, &charger->adc);
215 da903x_read(charger->master, DA9030_FAULT_LOG, &charger->fault);
216 charger->chdet = da903x_query_status(charger->master,
217 DA9030_STATUS_CHDET);
218 }
219
da9030_set_charge(struct da9030_charger * charger,int on)220 static void da9030_set_charge(struct da9030_charger *charger, int on)
221 {
222 uint8_t val;
223
224 if (on) {
225 val = DA9030_CHRG_CHARGER_ENABLE;
226 val |= (charger->charge_milliamp / 100) << 3;
227 val |= (charger->charge_millivolt - 4000) / 50;
228 charger->is_on = 1;
229 } else {
230 val = 0;
231 charger->is_on = 0;
232 }
233
234 da903x_write(charger->master, DA9030_CHARGE_CONTROL, val);
235
236 power_supply_changed(charger->psy);
237 }
238
da9030_charger_check_state(struct da9030_charger * charger)239 static void da9030_charger_check_state(struct da9030_charger *charger)
240 {
241 da9030_charger_update_state(charger);
242
243 /* we wake or boot with external power on */
244 if (!charger->is_on) {
245 if ((charger->chdet) &&
246 (charger->adc.vbat_res <
247 charger->thresholds.vbat_charge_start)) {
248 da9030_set_charge(charger, 1);
249 }
250 } else {
251 /* Charger has been pulled out */
252 if (!charger->chdet) {
253 da9030_set_charge(charger, 0);
254 return;
255 }
256
257 if (charger->adc.vbat_res >=
258 charger->thresholds.vbat_charge_stop) {
259 da9030_set_charge(charger, 0);
260 da903x_write(charger->master, DA9030_VBATMON,
261 charger->thresholds.vbat_charge_restart);
262 } else if (charger->adc.vbat_res >
263 charger->thresholds.vbat_low) {
264 /* we are charging and passed LOW_THRESH,
265 so upate DA9030 VBAT threshold
266 */
267 da903x_write(charger->master, DA9030_VBATMON,
268 charger->thresholds.vbat_low);
269 }
270 if (charger->adc.vchmax_res > charger->thresholds.vcharge_max ||
271 charger->adc.vchmin_res < charger->thresholds.vcharge_min ||
272 /* Temperature readings are negative */
273 charger->adc.tbat_res < charger->thresholds.tbat_high ||
274 charger->adc.tbat_res > charger->thresholds.tbat_low) {
275 /* disable charger */
276 da9030_set_charge(charger, 0);
277 }
278 }
279 }
280
da9030_charging_monitor(struct work_struct * work)281 static void da9030_charging_monitor(struct work_struct *work)
282 {
283 struct da9030_charger *charger;
284
285 charger = container_of(work, struct da9030_charger, work.work);
286
287 da9030_charger_check_state(charger);
288
289 /* reschedule for the next time */
290 schedule_delayed_work(&charger->work, charger->interval);
291 }
292
293 static enum power_supply_property da9030_battery_props[] = {
294 POWER_SUPPLY_PROP_MODEL_NAME,
295 POWER_SUPPLY_PROP_STATUS,
296 POWER_SUPPLY_PROP_HEALTH,
297 POWER_SUPPLY_PROP_TECHNOLOGY,
298 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
299 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
300 POWER_SUPPLY_PROP_VOLTAGE_NOW,
301 POWER_SUPPLY_PROP_CURRENT_AVG,
302 };
303
da9030_battery_check_status(struct da9030_charger * charger,union power_supply_propval * val)304 static void da9030_battery_check_status(struct da9030_charger *charger,
305 union power_supply_propval *val)
306 {
307 if (charger->chdet) {
308 if (charger->is_on)
309 val->intval = POWER_SUPPLY_STATUS_CHARGING;
310 else
311 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
312 } else {
313 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
314 }
315 }
316
da9030_battery_check_health(struct da9030_charger * charger,union power_supply_propval * val)317 static void da9030_battery_check_health(struct da9030_charger *charger,
318 union power_supply_propval *val)
319 {
320 if (charger->fault & DA9030_FAULT_LOG_OVER_TEMP)
321 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
322 else if (charger->fault & DA9030_FAULT_LOG_VBAT_OVER)
323 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
324 else
325 val->intval = POWER_SUPPLY_HEALTH_GOOD;
326 }
327
da9030_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)328 static int da9030_battery_get_property(struct power_supply *psy,
329 enum power_supply_property psp,
330 union power_supply_propval *val)
331 {
332 struct da9030_charger *charger = power_supply_get_drvdata(psy);
333
334 switch (psp) {
335 case POWER_SUPPLY_PROP_STATUS:
336 da9030_battery_check_status(charger, val);
337 break;
338 case POWER_SUPPLY_PROP_HEALTH:
339 da9030_battery_check_health(charger, val);
340 break;
341 case POWER_SUPPLY_PROP_TECHNOLOGY:
342 val->intval = charger->battery_info->technology;
343 break;
344 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
345 val->intval = charger->battery_info->voltage_max_design;
346 break;
347 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
348 val->intval = charger->battery_info->voltage_min_design;
349 break;
350 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
351 val->intval = da9030_reg_to_mV(charger->adc.vbat_res) * 1000;
352 break;
353 case POWER_SUPPLY_PROP_CURRENT_AVG:
354 val->intval =
355 da9030_reg_to_mA(charger->adc.ichaverage_res) * 1000;
356 break;
357 case POWER_SUPPLY_PROP_MODEL_NAME:
358 val->strval = charger->battery_info->name;
359 break;
360 default:
361 break;
362 }
363
364 return 0;
365 }
366
da9030_battery_vbat_event(struct da9030_charger * charger)367 static void da9030_battery_vbat_event(struct da9030_charger *charger)
368 {
369 da9030_read_adc(charger, &charger->adc);
370
371 if (charger->is_on)
372 return;
373
374 if (charger->adc.vbat_res < charger->thresholds.vbat_low) {
375 /* set VBAT threshold for critical */
376 da903x_write(charger->master, DA9030_VBATMON,
377 charger->thresholds.vbat_crit);
378 if (charger->battery_low)
379 charger->battery_low();
380 } else if (charger->adc.vbat_res <
381 charger->thresholds.vbat_crit) {
382 /* notify the system of battery critical */
383 if (charger->battery_critical)
384 charger->battery_critical();
385 }
386 }
387
da9030_battery_event(struct notifier_block * nb,unsigned long event,void * data)388 static int da9030_battery_event(struct notifier_block *nb, unsigned long event,
389 void *data)
390 {
391 struct da9030_charger *charger =
392 container_of(nb, struct da9030_charger, nb);
393
394 switch (event) {
395 case DA9030_EVENT_CHDET:
396 cancel_delayed_work_sync(&charger->work);
397 schedule_work(&charger->work.work);
398 break;
399 case DA9030_EVENT_VBATMON:
400 da9030_battery_vbat_event(charger);
401 break;
402 case DA9030_EVENT_CHIOVER:
403 case DA9030_EVENT_TBAT:
404 da9030_set_charge(charger, 0);
405 break;
406 }
407
408 return 0;
409 }
410
da9030_battery_convert_thresholds(struct da9030_charger * charger,struct da9030_battery_info * pdata)411 static void da9030_battery_convert_thresholds(struct da9030_charger *charger,
412 struct da9030_battery_info *pdata)
413 {
414 charger->thresholds.tbat_low = pdata->tbat_low;
415 charger->thresholds.tbat_high = pdata->tbat_high;
416 charger->thresholds.tbat_restart = pdata->tbat_restart;
417
418 charger->thresholds.vbat_low =
419 da9030_millivolt_to_reg(pdata->vbat_low);
420 charger->thresholds.vbat_crit =
421 da9030_millivolt_to_reg(pdata->vbat_crit);
422 charger->thresholds.vbat_charge_start =
423 da9030_millivolt_to_reg(pdata->vbat_charge_start);
424 charger->thresholds.vbat_charge_stop =
425 da9030_millivolt_to_reg(pdata->vbat_charge_stop);
426 charger->thresholds.vbat_charge_restart =
427 da9030_millivolt_to_reg(pdata->vbat_charge_restart);
428
429 charger->thresholds.vcharge_min =
430 da9030_millivolt_to_reg(pdata->vcharge_min);
431 charger->thresholds.vcharge_max =
432 da9030_millivolt_to_reg(pdata->vcharge_max);
433 }
434
da9030_battery_setup_psy(struct da9030_charger * charger)435 static void da9030_battery_setup_psy(struct da9030_charger *charger)
436 {
437 struct power_supply_desc *psy_desc = &charger->psy_desc;
438 struct power_supply_info *info = charger->battery_info;
439
440 psy_desc->name = info->name;
441 psy_desc->use_for_apm = info->use_for_apm;
442 psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
443 psy_desc->get_property = da9030_battery_get_property;
444
445 psy_desc->properties = da9030_battery_props;
446 psy_desc->num_properties = ARRAY_SIZE(da9030_battery_props);
447 };
448
da9030_battery_charger_init(struct da9030_charger * charger)449 static int da9030_battery_charger_init(struct da9030_charger *charger)
450 {
451 char v[5];
452 int ret;
453
454 v[0] = v[1] = charger->thresholds.vbat_low;
455 v[2] = charger->thresholds.tbat_high;
456 v[3] = charger->thresholds.tbat_restart;
457 v[4] = charger->thresholds.tbat_low;
458
459 ret = da903x_writes(charger->master, DA9030_VBATMON, 5, v);
460 if (ret)
461 return ret;
462
463 /*
464 * Enable reference voltage supply for ADC from the LDO_INTERNAL
465 * regulator. Must be set before ADC measurements can be made.
466 */
467 ret = da903x_write(charger->master, DA9030_ADC_MAN_CONTROL,
468 DA9030_ADC_LDO_INT_ENABLE |
469 DA9030_ADC_TBATREF_ENABLE);
470 if (ret)
471 return ret;
472
473 /* enable auto ADC measurements */
474 return da903x_write(charger->master, DA9030_ADC_AUTO_CONTROL,
475 DA9030_ADC_TBAT_ENABLE | DA9030_ADC_VBAT_IN_TXON |
476 DA9030_ADC_VCH_ENABLE | DA9030_ADC_ICH_ENABLE |
477 DA9030_ADC_VBAT_ENABLE |
478 DA9030_ADC_AUTO_SLEEP_ENABLE);
479 }
480
da9030_battery_probe(struct platform_device * pdev)481 static int da9030_battery_probe(struct platform_device *pdev)
482 {
483 struct da9030_charger *charger;
484 struct power_supply_config psy_cfg = {};
485 struct da9030_battery_info *pdata = pdev->dev.platform_data;
486 int ret;
487
488 if (pdata == NULL)
489 return -EINVAL;
490
491 if (pdata->charge_milliamp >= 1500 ||
492 pdata->charge_millivolt < 4000 ||
493 pdata->charge_millivolt > 4350)
494 return -EINVAL;
495
496 charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
497 if (charger == NULL)
498 return -ENOMEM;
499
500 charger->master = pdev->dev.parent;
501
502 /* 10 seconds between monitor runs unless platform defines other
503 interval */
504 charger->interval = msecs_to_jiffies(
505 (pdata->batmon_interval ? : 10) * 1000);
506
507 charger->charge_milliamp = pdata->charge_milliamp;
508 charger->charge_millivolt = pdata->charge_millivolt;
509 charger->battery_info = pdata->battery_info;
510 charger->battery_low = pdata->battery_low;
511 charger->battery_critical = pdata->battery_critical;
512
513 da9030_battery_convert_thresholds(charger, pdata);
514
515 ret = da9030_battery_charger_init(charger);
516 if (ret)
517 goto err_charger_init;
518
519 INIT_DELAYED_WORK(&charger->work, da9030_charging_monitor);
520 schedule_delayed_work(&charger->work, charger->interval);
521
522 charger->nb.notifier_call = da9030_battery_event;
523 ret = da903x_register_notifier(charger->master, &charger->nb,
524 DA9030_EVENT_CHDET |
525 DA9030_EVENT_VBATMON |
526 DA9030_EVENT_CHIOVER |
527 DA9030_EVENT_TBAT);
528 if (ret)
529 goto err_notifier;
530
531 da9030_battery_setup_psy(charger);
532 psy_cfg.drv_data = charger;
533 charger->psy = devm_power_supply_register(&pdev->dev,
534 &charger->psy_desc,
535 &psy_cfg);
536 if (IS_ERR(charger->psy)) {
537 ret = PTR_ERR(charger->psy);
538 goto err_ps_register;
539 }
540
541 charger->debug_file = da9030_bat_create_debugfs(charger);
542 platform_set_drvdata(pdev, charger);
543 return 0;
544
545 err_ps_register:
546 da903x_unregister_notifier(charger->master, &charger->nb,
547 DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
548 DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
549 err_notifier:
550 cancel_delayed_work(&charger->work);
551
552 err_charger_init:
553 return ret;
554 }
555
da9030_battery_remove(struct platform_device * dev)556 static void da9030_battery_remove(struct platform_device *dev)
557 {
558 struct da9030_charger *charger = platform_get_drvdata(dev);
559
560 da9030_bat_remove_debugfs(charger);
561
562 da903x_unregister_notifier(charger->master, &charger->nb,
563 DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
564 DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
565 cancel_delayed_work_sync(&charger->work);
566 da9030_set_charge(charger, 0);
567 }
568
569 static struct platform_driver da903x_battery_driver = {
570 .driver = {
571 .name = "da903x-battery",
572 },
573 .probe = da9030_battery_probe,
574 .remove = da9030_battery_remove,
575 };
576
577 module_platform_driver(da903x_battery_driver);
578
579 MODULE_DESCRIPTION("DA9030 battery charger driver");
580 MODULE_AUTHOR("Mike Rapoport, CompuLab");
581 MODULE_LICENSE("GPL");
582