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