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
59struct 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
73struct 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
88struct 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
121static inline int da9030_reg_to_mV(int reg)
122{
123	return ((reg * 2650) >> 8) + 2650;
124}
125
126static inline int da9030_millivolt_to_reg(int mV)
127{
128	return ((mV - 2650) << 8) / 2650;
129}
130
131static inline int da9030_reg_to_mA(int reg)
132{
133	return ((reg * 24000) >> 8) / 15;
134}
135
136#ifdef CONFIG_DEBUG_FS
137static 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
175DEFINE_SHOW_ATTRIBUTE(bat_debug);
176
177static 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
184static void da9030_bat_remove_debugfs(struct da9030_charger *charger)
185{
186	debugfs_remove(charger->debug_file);
187}
188#else
189static inline struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
190{
191	return NULL;
192}
193static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger)
194{
195}
196#endif
197
198static 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
205static 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
220static 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
239static 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		    /* Tempreture 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
281static 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
293static 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
304static 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
317static 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
328static 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
367static 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
388static 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
411static 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
435static 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
449static 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 measuremnts */
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
481static 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 = power_supply_register(&pdev->dev, &charger->psy_desc,
534					     &psy_cfg);
535	if (IS_ERR(charger->psy)) {
536		ret = PTR_ERR(charger->psy);
537		goto err_ps_register;
538	}
539
540	charger->debug_file = da9030_bat_create_debugfs(charger);
541	platform_set_drvdata(pdev, charger);
542	return 0;
543
544err_ps_register:
545	da903x_unregister_notifier(charger->master, &charger->nb,
546				   DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
547				   DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
548err_notifier:
549	cancel_delayed_work(&charger->work);
550
551err_charger_init:
552	return ret;
553}
554
555static int da9030_battery_remove(struct platform_device *dev)
556{
557	struct da9030_charger *charger = platform_get_drvdata(dev);
558
559	da9030_bat_remove_debugfs(charger);
560
561	da903x_unregister_notifier(charger->master, &charger->nb,
562				   DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
563				   DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
564	cancel_delayed_work_sync(&charger->work);
565	da9030_set_charge(charger, 0);
566	power_supply_unregister(charger->psy);
567
568	return 0;
569}
570
571static struct platform_driver da903x_battery_driver = {
572	.driver	= {
573		.name	= "da903x-battery",
574	},
575	.probe = da9030_battery_probe,
576	.remove = da9030_battery_remove,
577};
578
579module_platform_driver(da903x_battery_driver);
580
581MODULE_DESCRIPTION("DA9030 battery charger driver");
582MODULE_AUTHOR("Mike Rapoport, CompuLab");
583MODULE_LICENSE("GPL");
584