aboutsummaryrefslogtreecommitdiff
path: root/drivers/power/da9030_battery.c
blob: 5ca0f4d90792d0c49be2f7225d6174744d867a82 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
/*
 * Battery charger driver for Dialog Semiconductor DA9030
 *
 * Copyright (C) 2008 Compulab, Ltd.
 * 	Mike Rapoport <mike@compulab.co.il>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/workqueue.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/da903x.h>

#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/notifier.h>

#define DA9030_FAULT_LOG		0x0a
#define DA9030_FAULT_LOG_OVER_TEMP	(1 << 7)
#define DA9030_FAULT_LOG_VBAT_OVER	(1 << 4)

#define DA9030_CHARGE_CONTROL		0x28
#define DA9030_CHRG_CHARGER_ENABLE	(1 << 7)

#define DA9030_ADC_MAN_CONTROL		0x30
#define DA9030_ADC_TBATREF_ENABLE	(1 << 5)
#define DA9030_ADC_LDO_INT_ENABLE	(1 << 4)

#define DA9030_ADC_AUTO_CONTROL		0x31
#define DA9030_ADC_TBAT_ENABLE		(1 << 5)
#define DA9030_ADC_VBAT_IN_TXON		(1 << 4)
#define DA9030_ADC_VCH_ENABLE		(1 << 3)
#define DA9030_ADC_ICH_ENABLE		(1 << 2)
#define DA9030_ADC_VBAT_ENABLE		(1 << 1)
#define DA9030_ADC_AUTO_SLEEP_ENABLE	(1 << 0)

#define DA9030_VBATMON		0x32
#define DA9030_VBATMONTXON	0x33
#define DA9030_TBATHIGHP	0x34
#define DA9030_TBATHIGHN	0x35
#define DA9030_TBATLOW		0x36

#define DA9030_VBAT_RES		0x41
#define DA9030_VBATMIN_RES	0x42
#define DA9030_VBATMINTXON_RES	0x43
#define DA9030_ICHMAX_RES	0x44
#define DA9030_ICHMIN_RES	0x45
#define DA9030_ICHAVERAGE_RES	0x46
#define DA9030_VCHMAX_RES	0x47
#define DA9030_VCHMIN_RES	0x48
#define DA9030_TBAT_RES		0x49

struct da9030_adc_res {
	uint8_t vbat_res;
	uint8_t vbatmin_res;
	uint8_t vbatmintxon;
	uint8_t ichmax_res;
	uint8_t ichmin_res;
	uint8_t ichaverage_res;
	uint8_t vchmax_res;
	uint8_t vchmin_res;
	uint8_t tbat_res;
	uint8_t adc_in4_res;
	uint8_t adc_in5_res;
};

struct da9030_battery_thresholds {
	int tbat_low;
	int tbat_high;
	int tbat_restart;

	int vbat_low;
	int vbat_crit;
	int vbat_charge_start;
	int vbat_charge_stop;
	int vbat_charge_restart;

	int vcharge_min;
	int vcharge_max;
};

struct da9030_charger {
	struct power_supply *psy;
	struct power_supply_desc psy_desc;

	struct device *master;

	struct da9030_adc_res adc;
	struct delayed_work work;
	unsigned int interval;

	struct power_supply_info *battery_info;

	struct da9030_battery_thresholds thresholds;

	unsigned int charge_milliamp;
	unsigned int charge_millivolt;

	/* charger status */
	bool chdet;
	uint8_t fault;
	int mA;
	int mV;
	bool is_on;

	struct notifier_block nb;

	/* platform callbacks for battery low and critical events */
	void (*battery_low)(void);
	void (*battery_critical)(void);

	struct dentry *debug_file;
};

static inline int da9030_reg_to_mV(int reg)
{
	return ((reg * 2650) >> 8) + 2650;
}

static inline int da9030_millivolt_to_reg(int mV)
{
	return ((mV - 2650) << 8) / 2650;
}

static inline int da9030_reg_to_mA(int reg)
{
	return ((reg * 24000) >> 8) / 15;
}

#ifdef CONFIG_DEBUG_FS
static int bat_debug_show(struct seq_file *s, void *data)
{
	struct da9030_charger *charger = s->private;

	seq_printf(s, "charger is %s\n", charger->is_on ? "on" : "off");
	if (charger->chdet) {
		seq_printf(s, "iset = %dmA, vset = %dmV\n",
			   charger->mA, charger->mV);
	}

	seq_printf(s, "vbat_res = %d (%dmV)\n",
		   charger->adc.vbat_res,
		   da9030_reg_to_mV(charger->adc.vbat_res));
	seq_printf(s, "vbatmin_res = %d (%dmV)\n",
		   charger->adc.vbatmin_res,
		   da9030_reg_to_mV(charger->adc.vbatmin_res));
	seq_printf(s, "vbatmintxon = %d (%dmV)\n",
		   charger->adc.vbatmintxon,
		   da9030_reg_to_mV(charger->adc.vbatmintxon));
	seq_printf(s, "ichmax_res = %d (%dmA)\n",
		   charger->adc.ichmax_res,
		   da9030_reg_to_mV(charger->adc.ichmax_res));
	seq_printf(s, "ichmin_res = %d (%dmA)\n",
		   charger->adc.ichmin_res,
		   da9030_reg_to_mA(charger->adc.ichmin_res));
	seq_printf(s, "ichaverage_res = %d (%dmA)\n",
		   charger->adc.ichaverage_res,
		   da9030_reg_to_mA(charger->adc.ichaverage_res));
	seq_printf(s, "vchmax_res = %d (%dmV)\n",
		   charger->adc.vchmax_res,
		   da9030_reg_to_mA(charger->adc.vchmax_res));
	seq_printf(s, "vchmin_res = %d (%dmV)\n",
		   charger->adc.vchmin_res,
		   da9030_reg_to_mV(charger->adc.vchmin_res));

	return 0;
}

static int debug_open(struct inode *inode, struct file *file)
{
	return single_open(file, bat_debug_show, inode->i_private);
}

static const struct file_operations bat_debug_fops = {
	.open		= debug_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
{
	charger->debug_file = debugfs_create_file("charger", 0666, NULL,
						  charger, &bat_debug_fops);
	return charger->debug_file;
}

static void da9030_bat_remove_debugfs(struct da9030_charger *charger)
{
	debugfs_remove(charger->debug_file);
}
#else
static inline struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
{
	return NULL;
}
static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger)
{
}
#endif

static inline void da9030_read_adc(struct da9030_charger *charger,
				   struct da9030_adc_res *adc)
{
	da903x_reads(charger->master, DA9030_VBAT_RES,
		     sizeof(*adc), (uint8_t *)adc);
}

static void da9030_charger_update_state(struct da9030_charger *charger)
{
	uint8_t val;

	da903x_read(charger->master, DA9030_CHARGE_CONTROL, &val);
	charger->is_on = (val & DA9030_CHRG_CHARGER_ENABLE) ? 1 : 0;
	charger->mA = ((val >> 3) & 0xf) * 100;
	charger->mV = (val & 0x7) * 50 + 4000;

	da9030_read_adc(charger, &charger->adc);
	da903x_read(charger->master, DA9030_FAULT_LOG, &charger->fault);
	charger->chdet = da903x_query_status(charger->master,
						     DA9030_STATUS_CHDET);
}

static void da9030_set_charge(struct da9030_charger *charger, int on)
{
	uint8_t val;

	if (on) {
		val = DA9030_CHRG_CHARGER_ENABLE;
		val |= (charger->charge_milliamp / 100) << 3;
		val |= (charger->charge_millivolt - 4000) / 50;
		charger->is_on = 1;
	} else {
		val = 0;
		charger->is_on = 0;
	}

	da903x_write(charger->master, DA9030_CHARGE_CONTROL, val);

	power_supply_changed(charger->psy);
}

static void da9030_charger_check_state(struct da9030_charger *charger)
{
	da9030_charger_update_state(charger);

	/* we wake or boot with external power on */
	if (!charger->is_on) {
		if ((charger->chdet) &&
		    (charger->adc.vbat_res <
		     charger->thresholds.vbat_charge_start)) {
			da9030_set_charge(charger, 1);
		}
	} else {
		/* Charger has been pulled out */
		if (!charger->chdet) {
			da9030_set_charge(charger, 0);
			return;
		}

		if (charger->adc.vbat_res >=
		    charger->thresholds.vbat_charge_stop) {
			da9030_set_charge(charger, 0);
			da903x_write(charger->master, DA9030_VBATMON,
				       charger->thresholds.vbat_charge_restart);
		} else if (charger->adc.vbat_res >
			   charger->thresholds.vbat_low) {
			/* we are charging and passed LOW_THRESH,
			   so upate DA9030 VBAT threshold
			 */
			da903x_write(charger->master, DA9030_VBATMON,
				     charger->thresholds.vbat_low);
		}
		if (charger->adc.vchmax_res > charger->thresholds.vcharge_max ||
		    charger->adc.vchmin_res < charger->thresholds.vcharge_min ||
		    /* Tempreture readings are negative */
		    charger->adc.tbat_res < charger->thresholds.tbat_high ||
		    charger->adc.tbat_res > charger->thresholds.tbat_low) {
			/* disable charger */
			da9030_set_charge(charger, 0);
		}
	}
}

static void da9030_charging_monitor(struct work_struct *work)
{
	struct da9030_charger *charger;

	charger = container_of(work, struct da9030_charger, work.work);

	da9030_charger_check_state(charger);

	/* reschedule for the next time */
	schedule_delayed_work(&charger->work, charger->interval);
}

static enum power_supply_property da9030_battery_props[] = {
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_AVG,
};

static void da9030_battery_check_status(struct da9030_charger *charger,
				    union power_supply_propval *val)
{
	if (charger->chdet) {
		if (charger->is_on)
			val->intval = POWER_SUPPLY_STATUS_CHARGING;
		else
			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
	} else {
		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	}
}

static void da9030_battery_check_health(struct da9030_charger *charger,
				    union power_supply_propval *val)
{
	if (charger->fault & DA9030_FAULT_LOG_OVER_TEMP)
		val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
	else if (charger->fault & DA9030_FAULT_LOG_VBAT_OVER)
		val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
	else
		val->intval = POWER_SUPPLY_HEALTH_GOOD;
}

static int da9030_battery_get_property(struct power_supply *psy,
				   enum power_supply_property psp,
				   union power_supply_propval *val)
{
	struct da9030_charger *charger = power_supply_get_drvdata(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		da9030_battery_check_status(charger, val);
		break;
	case POWER_SUPPLY_PROP_HEALTH:
		da9030_battery_check_health(charger, val);
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = charger->battery_info->technology;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
		val->intval = charger->battery_info->voltage_max_design;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
		val->intval = charger->battery_info->voltage_min_design;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		val->intval = da9030_reg_to_mV(charger->adc.vbat_res) * 1000;
		break;
	case POWER_SUPPLY_PROP_CURRENT_AVG:
		val->intval =
			da9030_reg_to_mA(charger->adc.ichaverage_res) * 1000;
		break;
	case POWER_SUPPLY_PROP_MODEL_NAME:
		val->strval = charger->battery_info->name;
		break;
	default:
		break;
	}

	return 0;
}

static void da9030_battery_vbat_event(struct da9030_charger *charger)
{
	da9030_read_adc(charger, &charger->adc);

	if (charger->is_on)
		return;

	if (charger->adc.vbat_res < charger->thresholds.vbat_low) {
		/* set VBAT threshold for critical */
		da903x_write(charger->master, DA9030_VBATMON,
			     charger->thresholds.vbat_crit);
		if (charger->battery_low)
			charger->battery_low();
	} else if (charger->adc.vbat_res <
		   charger->thresholds.vbat_crit) {
		/* notify the system of battery critical */
		if (charger->battery_critical)
			charger->battery_critical();
	}
}

static int da9030_battery_event(struct notifier_block *nb, unsigned long event,
				void *data)
{
	struct da9030_charger *charger =
		container_of(nb, struct da9030_charger, nb);

	switch (event) {
	case DA9030_EVENT_CHDET:
		cancel_delayed_work_sync(&charger->work);
		schedule_work(&charger->work.work);
		break;
	case DA9030_EVENT_VBATMON:
		da9030_battery_vbat_event(charger);
		break;
	case DA9030_EVENT_CHIOVER:
	case DA9030_EVENT_TBAT:
		da9030_set_charge(charger, 0);
		break;
	}

	return 0;
}

static void da9030_battery_convert_thresholds(struct da9030_charger *charger,
					      struct da9030_battery_info *pdata)
{
	charger->thresholds.tbat_low = pdata->tbat_low;
	charger->thresholds.tbat_high = pdata->tbat_high;
	charger->thresholds.tbat_restart  = pdata->tbat_restart;

	charger->thresholds.vbat_low =
		da9030_millivolt_to_reg(pdata->vbat_low);
	charger->thresholds.vbat_crit =
		da9030_millivolt_to_reg(pdata->vbat_crit);
	charger->thresholds.vbat_charge_start =
		da9030_millivolt_to_reg(pdata->vbat_charge_start);
	charger->thresholds.vbat_charge_stop =
		da9030_millivolt_to_reg(pdata->vbat_charge_stop);
	charger->thresholds.vbat_charge_restart =
		da9030_millivolt_to_reg(pdata->vbat_charge_restart);

	charger->thresholds.vcharge_min =
		da9030_millivolt_to_reg(pdata->vcharge_min);
	charger->thresholds.vcharge_max =
		da9030_millivolt_to_reg(pdata->vcharge_max);
}

static void da9030_battery_setup_psy(struct da9030_charger *charger)
{
	struct power_supply_desc *psy_desc = &charger->psy_desc;
	struct power_supply_info *info = charger->battery_info;

	psy_desc->name = info->name;
	psy_desc->use_for_apm = info->use_for_apm;
	psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
	psy_desc->get_property = da9030_battery_get_property;

	psy_desc->properties = da9030_battery_props;
	psy_desc->num_properties = ARRAY_SIZE(da9030_battery_props);
};

static int da9030_battery_charger_init(struct da9030_charger *charger)
{
	char v[5];
	int ret;

	v[0] = v[1] = charger->thresholds.vbat_low;
	v[2] = charger->thresholds.tbat_high;
	v[3] = charger->thresholds.tbat_restart;
	v[4] = charger->thresholds.tbat_low;

	ret = da903x_writes(charger->master, DA9030_VBATMON, 5, v);
	if (ret)
		return ret;

	/*
	 * Enable reference voltage supply for ADC from the LDO_INTERNAL
	 * regulator. Must be set before ADC measurements can be made.
	 */
	ret = da903x_write(charger->master, DA9030_ADC_MAN_CONTROL,
			   DA9030_ADC_LDO_INT_ENABLE |
			   DA9030_ADC_TBATREF_ENABLE);
	if (ret)
		return ret;

	/* enable auto ADC measuremnts */
	return da903x_write(charger->master, DA9030_ADC_AUTO_CONTROL,
			    DA9030_ADC_TBAT_ENABLE | DA9030_ADC_VBAT_IN_TXON |
			    DA9030_ADC_VCH_ENABLE | DA9030_ADC_ICH_ENABLE |
			    DA9030_ADC_VBAT_ENABLE |
			    DA9030_ADC_AUTO_SLEEP_ENABLE);
}

static int da9030_battery_probe(struct platform_device *pdev)
{
	struct da9030_charger *charger;
	struct power_supply_config psy_cfg = {};
	struct da9030_battery_info *pdata = pdev->dev.platform_data;
	int ret;

	if (pdata == NULL)
		return -EINVAL;

	if (pdata->charge_milliamp >= 1500 ||
	    pdata->charge_millivolt < 4000 ||
	    pdata->charge_millivolt > 4350)
		return -EINVAL;

	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
	if (charger == NULL)
		return -ENOMEM;

	charger->master = pdev->dev.parent;

	/* 10 seconds between monitor runs unless platform defines other
	   interval */
	charger->interval = msecs_to_jiffies(
		(pdata->batmon_interval ? : 10) * 1000);

	charger->charge_milliamp = pdata->charge_milliamp;
	charger->charge_millivolt = pdata->charge_millivolt;
	charger->battery_info = pdata->battery_info;
	charger->battery_low = pdata->battery_low;
	charger->battery_critical = pdata->battery_critical;

	da9030_battery_convert_thresholds(charger, pdata);

	ret = da9030_battery_charger_init(charger);
	if (ret)
		goto err_charger_init;

	INIT_DELAYED_WORK(&charger->work, da9030_charging_monitor);
	schedule_delayed_work(&charger->work, charger->interval);

	charger->nb.notifier_call = da9030_battery_event;
	ret = da903x_register_notifier(charger->master, &charger->nb,
				       DA9030_EVENT_CHDET |
				       DA9030_EVENT_VBATMON |
				       DA9030_EVENT_CHIOVER |
				       DA9030_EVENT_TBAT);
	if (ret)
		goto err_notifier;

	da9030_battery_setup_psy(charger);
	psy_cfg.drv_data = charger;
	charger->psy = power_supply_register(&pdev->dev, &charger->psy_desc,
					     &psy_cfg);
	if (IS_ERR(charger->psy)) {
		ret = PTR_ERR(charger->psy);
		goto err_ps_register;
	}

	charger->debug_file = da9030_bat_create_debugfs(charger);
	platform_set_drvdata(pdev, charger);
	return 0;

err_ps_register:
	da903x_unregister_notifier(charger->master, &charger->nb,
				   DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
				   DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
err_notifier:
	cancel_delayed_work(&charger->work);

err_charger_init:
	return ret;
}

static int da9030_battery_remove(struct platform_device *dev)
{
	struct da9030_charger *charger = platform_get_drvdata(dev);

	da9030_bat_remove_debugfs(charger);

	da903x_unregister_notifier(charger->master, &charger->nb,
				   DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
				   DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
	cancel_delayed_work_sync(&charger->work);
	da9030_set_charge(charger, 0);
	power_supply_unregister(charger->psy);

	return 0;
}

static struct platform_driver da903x_battery_driver = {
	.driver	= {
		.name	= "da903x-battery",
	},
	.probe = da9030_battery_probe,
	.remove = da9030_battery_remove,
};

module_platform_driver(da903x_battery_driver);

MODULE_DESCRIPTION("DA9030 battery charger driver");
MODULE_AUTHOR("Mike Rapoport, CompuLab");
MODULE_LICENSE("GPL");