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12#include <linux/kernel.h>
13#include <linux/slab.h>
14#include <linux/init.h>
15#include <linux/types.h>
16#include <linux/device.h>
17#include <linux/workqueue.h>
18#include <linux/module.h>
19#include <linux/platform_device.h>
20#include <linux/power_supply.h>
21#include <linux/mfd/da903x.h>
22
23#include <linux/debugfs.h>
24#include <linux/seq_file.h>
25#include <linux/notifier.h>
26
27#define DA9030_FAULT_LOG 0x0a
28#define DA9030_FAULT_LOG_OVER_TEMP (1 << 7)
29#define DA9030_FAULT_LOG_VBAT_OVER (1 << 4)
30
31#define DA9030_CHARGE_CONTROL 0x28
32#define DA9030_CHRG_CHARGER_ENABLE (1 << 7)
33
34#define DA9030_ADC_MAN_CONTROL 0x30
35#define DA9030_ADC_TBATREF_ENABLE (1 << 5)
36#define DA9030_ADC_LDO_INT_ENABLE (1 << 4)
37
38#define DA9030_ADC_AUTO_CONTROL 0x31
39#define DA9030_ADC_TBAT_ENABLE (1 << 5)
40#define DA9030_ADC_VBAT_IN_TXON (1 << 4)
41#define DA9030_ADC_VCH_ENABLE (1 << 3)
42#define DA9030_ADC_ICH_ENABLE (1 << 2)
43#define DA9030_ADC_VBAT_ENABLE (1 << 1)
44#define DA9030_ADC_AUTO_SLEEP_ENABLE (1 << 0)
45
46#define DA9030_VBATMON 0x32
47#define DA9030_VBATMONTXON 0x33
48#define DA9030_TBATHIGHP 0x34
49#define DA9030_TBATHIGHN 0x35
50#define DA9030_TBATLOW 0x36
51
52#define DA9030_VBAT_RES 0x41
53#define DA9030_VBATMIN_RES 0x42
54#define DA9030_VBATMINTXON_RES 0x43
55#define DA9030_ICHMAX_RES 0x44
56#define DA9030_ICHMIN_RES 0x45
57#define DA9030_ICHAVERAGE_RES 0x46
58#define DA9030_VCHMAX_RES 0x47
59#define DA9030_VCHMIN_RES 0x48
60#define DA9030_TBAT_RES 0x49
61
62struct da9030_adc_res {
63 uint8_t vbat_res;
64 uint8_t vbatmin_res;
65 uint8_t vbatmintxon;
66 uint8_t ichmax_res;
67 uint8_t ichmin_res;
68 uint8_t ichaverage_res;
69 uint8_t vchmax_res;
70 uint8_t vchmin_res;
71 uint8_t tbat_res;
72 uint8_t adc_in4_res;
73 uint8_t adc_in5_res;
74};
75
76struct da9030_battery_thresholds {
77 int tbat_low;
78 int tbat_high;
79 int tbat_restart;
80
81 int vbat_low;
82 int vbat_crit;
83 int vbat_charge_start;
84 int vbat_charge_stop;
85 int vbat_charge_restart;
86
87 int vcharge_min;
88 int vcharge_max;
89};
90
91struct da9030_charger {
92 struct power_supply *psy;
93 struct power_supply_desc psy_desc;
94
95 struct device *master;
96
97 struct da9030_adc_res adc;
98 struct delayed_work work;
99 unsigned int interval;
100
101 struct power_supply_info *battery_info;
102
103 struct da9030_battery_thresholds thresholds;
104
105 unsigned int charge_milliamp;
106 unsigned int charge_millivolt;
107
108
109 bool chdet;
110 uint8_t fault;
111 int mA;
112 int mV;
113 bool is_on;
114
115 struct notifier_block nb;
116
117
118 void (*battery_low)(void);
119 void (*battery_critical)(void);
120
121 struct dentry *debug_file;
122};
123
124static inline int da9030_reg_to_mV(int reg)
125{
126 return ((reg * 2650) >> 8) + 2650;
127}
128
129static inline int da9030_millivolt_to_reg(int mV)
130{
131 return ((mV - 2650) << 8) / 2650;
132}
133
134static inline int da9030_reg_to_mA(int reg)
135{
136 return ((reg * 24000) >> 8) / 15;
137}
138
139#ifdef CONFIG_DEBUG_FS
140static int bat_debug_show(struct seq_file *s, void *data)
141{
142 struct da9030_charger *charger = s->private;
143
144 seq_printf(s, "charger is %s\n", charger->is_on ? "on" : "off");
145 if (charger->chdet) {
146 seq_printf(s, "iset = %dmA, vset = %dmV\n",
147 charger->mA, charger->mV);
148 }
149
150 seq_printf(s, "vbat_res = %d (%dmV)\n",
151 charger->adc.vbat_res,
152 da9030_reg_to_mV(charger->adc.vbat_res));
153 seq_printf(s, "vbatmin_res = %d (%dmV)\n",
154 charger->adc.vbatmin_res,
155 da9030_reg_to_mV(charger->adc.vbatmin_res));
156 seq_printf(s, "vbatmintxon = %d (%dmV)\n",
157 charger->adc.vbatmintxon,
158 da9030_reg_to_mV(charger->adc.vbatmintxon));
159 seq_printf(s, "ichmax_res = %d (%dmA)\n",
160 charger->adc.ichmax_res,
161 da9030_reg_to_mV(charger->adc.ichmax_res));
162 seq_printf(s, "ichmin_res = %d (%dmA)\n",
163 charger->adc.ichmin_res,
164 da9030_reg_to_mA(charger->adc.ichmin_res));
165 seq_printf(s, "ichaverage_res = %d (%dmA)\n",
166 charger->adc.ichaverage_res,
167 da9030_reg_to_mA(charger->adc.ichaverage_res));
168 seq_printf(s, "vchmax_res = %d (%dmV)\n",
169 charger->adc.vchmax_res,
170 da9030_reg_to_mA(charger->adc.vchmax_res));
171 seq_printf(s, "vchmin_res = %d (%dmV)\n",
172 charger->adc.vchmin_res,
173 da9030_reg_to_mV(charger->adc.vchmin_res));
174
175 return 0;
176}
177
178static int debug_open(struct inode *inode, struct file *file)
179{
180 return single_open(file, bat_debug_show, inode->i_private);
181}
182
183static const struct file_operations bat_debug_fops = {
184 .open = debug_open,
185 .read = seq_read,
186 .llseek = seq_lseek,
187 .release = single_release,
188};
189
190static struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
191{
192 charger->debug_file = debugfs_create_file("charger", 0666, NULL,
193 charger, &bat_debug_fops);
194 return charger->debug_file;
195}
196
197static void da9030_bat_remove_debugfs(struct da9030_charger *charger)
198{
199 debugfs_remove(charger->debug_file);
200}
201#else
202static inline struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
203{
204 return NULL;
205}
206static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger)
207{
208}
209#endif
210
211static inline void da9030_read_adc(struct da9030_charger *charger,
212 struct da9030_adc_res *adc)
213{
214 da903x_reads(charger->master, DA9030_VBAT_RES,
215 sizeof(*adc), (uint8_t *)adc);
216}
217
218static void da9030_charger_update_state(struct da9030_charger *charger)
219{
220 uint8_t val;
221
222 da903x_read(charger->master, DA9030_CHARGE_CONTROL, &val);
223 charger->is_on = (val & DA9030_CHRG_CHARGER_ENABLE) ? 1 : 0;
224 charger->mA = ((val >> 3) & 0xf) * 100;
225 charger->mV = (val & 0x7) * 50 + 4000;
226
227 da9030_read_adc(charger, &charger->adc);
228 da903x_read(charger->master, DA9030_FAULT_LOG, &charger->fault);
229 charger->chdet = da903x_query_status(charger->master,
230 DA9030_STATUS_CHDET);
231}
232
233static void da9030_set_charge(struct da9030_charger *charger, int on)
234{
235 uint8_t val;
236
237 if (on) {
238 val = DA9030_CHRG_CHARGER_ENABLE;
239 val |= (charger->charge_milliamp / 100) << 3;
240 val |= (charger->charge_millivolt - 4000) / 50;
241 charger->is_on = 1;
242 } else {
243 val = 0;
244 charger->is_on = 0;
245 }
246
247 da903x_write(charger->master, DA9030_CHARGE_CONTROL, val);
248
249 power_supply_changed(charger->psy);
250}
251
252static void da9030_charger_check_state(struct da9030_charger *charger)
253{
254 da9030_charger_update_state(charger);
255
256
257 if (!charger->is_on) {
258 if ((charger->chdet) &&
259 (charger->adc.vbat_res <
260 charger->thresholds.vbat_charge_start)) {
261 da9030_set_charge(charger, 1);
262 }
263 } else {
264
265 if (!charger->chdet) {
266 da9030_set_charge(charger, 0);
267 return;
268 }
269
270 if (charger->adc.vbat_res >=
271 charger->thresholds.vbat_charge_stop) {
272 da9030_set_charge(charger, 0);
273 da903x_write(charger->master, DA9030_VBATMON,
274 charger->thresholds.vbat_charge_restart);
275 } else if (charger->adc.vbat_res >
276 charger->thresholds.vbat_low) {
277
278
279
280 da903x_write(charger->master, DA9030_VBATMON,
281 charger->thresholds.vbat_low);
282 }
283 if (charger->adc.vchmax_res > charger->thresholds.vcharge_max ||
284 charger->adc.vchmin_res < charger->thresholds.vcharge_min ||
285
286 charger->adc.tbat_res < charger->thresholds.tbat_high ||
287 charger->adc.tbat_res > charger->thresholds.tbat_low) {
288
289 da9030_set_charge(charger, 0);
290 }
291 }
292}
293
294static void da9030_charging_monitor(struct work_struct *work)
295{
296 struct da9030_charger *charger;
297
298 charger = container_of(work, struct da9030_charger, work.work);
299
300 da9030_charger_check_state(charger);
301
302
303 schedule_delayed_work(&charger->work, charger->interval);
304}
305
306static enum power_supply_property da9030_battery_props[] = {
307 POWER_SUPPLY_PROP_MODEL_NAME,
308 POWER_SUPPLY_PROP_STATUS,
309 POWER_SUPPLY_PROP_HEALTH,
310 POWER_SUPPLY_PROP_TECHNOLOGY,
311 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
312 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
313 POWER_SUPPLY_PROP_VOLTAGE_NOW,
314 POWER_SUPPLY_PROP_CURRENT_AVG,
315};
316
317static void da9030_battery_check_status(struct da9030_charger *charger,
318 union power_supply_propval *val)
319{
320 if (charger->chdet) {
321 if (charger->is_on)
322 val->intval = POWER_SUPPLY_STATUS_CHARGING;
323 else
324 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
325 } else {
326 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
327 }
328}
329
330static void da9030_battery_check_health(struct da9030_charger *charger,
331 union power_supply_propval *val)
332{
333 if (charger->fault & DA9030_FAULT_LOG_OVER_TEMP)
334 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
335 else if (charger->fault & DA9030_FAULT_LOG_VBAT_OVER)
336 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
337 else
338 val->intval = POWER_SUPPLY_HEALTH_GOOD;
339}
340
341static int da9030_battery_get_property(struct power_supply *psy,
342 enum power_supply_property psp,
343 union power_supply_propval *val)
344{
345 struct da9030_charger *charger = power_supply_get_drvdata(psy);
346
347 switch (psp) {
348 case POWER_SUPPLY_PROP_STATUS:
349 da9030_battery_check_status(charger, val);
350 break;
351 case POWER_SUPPLY_PROP_HEALTH:
352 da9030_battery_check_health(charger, val);
353 break;
354 case POWER_SUPPLY_PROP_TECHNOLOGY:
355 val->intval = charger->battery_info->technology;
356 break;
357 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
358 val->intval = charger->battery_info->voltage_max_design;
359 break;
360 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
361 val->intval = charger->battery_info->voltage_min_design;
362 break;
363 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
364 val->intval = da9030_reg_to_mV(charger->adc.vbat_res) * 1000;
365 break;
366 case POWER_SUPPLY_PROP_CURRENT_AVG:
367 val->intval =
368 da9030_reg_to_mA(charger->adc.ichaverage_res) * 1000;
369 break;
370 case POWER_SUPPLY_PROP_MODEL_NAME:
371 val->strval = charger->battery_info->name;
372 break;
373 default:
374 break;
375 }
376
377 return 0;
378}
379
380static void da9030_battery_vbat_event(struct da9030_charger *charger)
381{
382 da9030_read_adc(charger, &charger->adc);
383
384 if (charger->is_on)
385 return;
386
387 if (charger->adc.vbat_res < charger->thresholds.vbat_low) {
388
389 da903x_write(charger->master, DA9030_VBATMON,
390 charger->thresholds.vbat_crit);
391 if (charger->battery_low)
392 charger->battery_low();
393 } else if (charger->adc.vbat_res <
394 charger->thresholds.vbat_crit) {
395
396 if (charger->battery_critical)
397 charger->battery_critical();
398 }
399}
400
401static int da9030_battery_event(struct notifier_block *nb, unsigned long event,
402 void *data)
403{
404 struct da9030_charger *charger =
405 container_of(nb, struct da9030_charger, nb);
406
407 switch (event) {
408 case DA9030_EVENT_CHDET:
409 cancel_delayed_work_sync(&charger->work);
410 schedule_work(&charger->work.work);
411 break;
412 case DA9030_EVENT_VBATMON:
413 da9030_battery_vbat_event(charger);
414 break;
415 case DA9030_EVENT_CHIOVER:
416 case DA9030_EVENT_TBAT:
417 da9030_set_charge(charger, 0);
418 break;
419 }
420
421 return 0;
422}
423
424static void da9030_battery_convert_thresholds(struct da9030_charger *charger,
425 struct da9030_battery_info *pdata)
426{
427 charger->thresholds.tbat_low = pdata->tbat_low;
428 charger->thresholds.tbat_high = pdata->tbat_high;
429 charger->thresholds.tbat_restart = pdata->tbat_restart;
430
431 charger->thresholds.vbat_low =
432 da9030_millivolt_to_reg(pdata->vbat_low);
433 charger->thresholds.vbat_crit =
434 da9030_millivolt_to_reg(pdata->vbat_crit);
435 charger->thresholds.vbat_charge_start =
436 da9030_millivolt_to_reg(pdata->vbat_charge_start);
437 charger->thresholds.vbat_charge_stop =
438 da9030_millivolt_to_reg(pdata->vbat_charge_stop);
439 charger->thresholds.vbat_charge_restart =
440 da9030_millivolt_to_reg(pdata->vbat_charge_restart);
441
442 charger->thresholds.vcharge_min =
443 da9030_millivolt_to_reg(pdata->vcharge_min);
444 charger->thresholds.vcharge_max =
445 da9030_millivolt_to_reg(pdata->vcharge_max);
446}
447
448static void da9030_battery_setup_psy(struct da9030_charger *charger)
449{
450 struct power_supply_desc *psy_desc = &charger->psy_desc;
451 struct power_supply_info *info = charger->battery_info;
452
453 psy_desc->name = info->name;
454 psy_desc->use_for_apm = info->use_for_apm;
455 psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
456 psy_desc->get_property = da9030_battery_get_property;
457
458 psy_desc->properties = da9030_battery_props;
459 psy_desc->num_properties = ARRAY_SIZE(da9030_battery_props);
460};
461
462static int da9030_battery_charger_init(struct da9030_charger *charger)
463{
464 char v[5];
465 int ret;
466
467 v[0] = v[1] = charger->thresholds.vbat_low;
468 v[2] = charger->thresholds.tbat_high;
469 v[3] = charger->thresholds.tbat_restart;
470 v[4] = charger->thresholds.tbat_low;
471
472 ret = da903x_writes(charger->master, DA9030_VBATMON, 5, v);
473 if (ret)
474 return ret;
475
476
477
478
479
480 ret = da903x_write(charger->master, DA9030_ADC_MAN_CONTROL,
481 DA9030_ADC_LDO_INT_ENABLE |
482 DA9030_ADC_TBATREF_ENABLE);
483 if (ret)
484 return ret;
485
486
487 return da903x_write(charger->master, DA9030_ADC_AUTO_CONTROL,
488 DA9030_ADC_TBAT_ENABLE | DA9030_ADC_VBAT_IN_TXON |
489 DA9030_ADC_VCH_ENABLE | DA9030_ADC_ICH_ENABLE |
490 DA9030_ADC_VBAT_ENABLE |
491 DA9030_ADC_AUTO_SLEEP_ENABLE);
492}
493
494static int da9030_battery_probe(struct platform_device *pdev)
495{
496 struct da9030_charger *charger;
497 struct power_supply_config psy_cfg = {};
498 struct da9030_battery_info *pdata = pdev->dev.platform_data;
499 int ret;
500
501 if (pdata == NULL)
502 return -EINVAL;
503
504 if (pdata->charge_milliamp >= 1500 ||
505 pdata->charge_millivolt < 4000 ||
506 pdata->charge_millivolt > 4350)
507 return -EINVAL;
508
509 charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
510 if (charger == NULL)
511 return -ENOMEM;
512
513 charger->master = pdev->dev.parent;
514
515
516
517 charger->interval = msecs_to_jiffies(
518 (pdata->batmon_interval ? : 10) * 1000);
519
520 charger->charge_milliamp = pdata->charge_milliamp;
521 charger->charge_millivolt = pdata->charge_millivolt;
522 charger->battery_info = pdata->battery_info;
523 charger->battery_low = pdata->battery_low;
524 charger->battery_critical = pdata->battery_critical;
525
526 da9030_battery_convert_thresholds(charger, pdata);
527
528 ret = da9030_battery_charger_init(charger);
529 if (ret)
530 goto err_charger_init;
531
532 INIT_DELAYED_WORK(&charger->work, da9030_charging_monitor);
533 schedule_delayed_work(&charger->work, charger->interval);
534
535 charger->nb.notifier_call = da9030_battery_event;
536 ret = da903x_register_notifier(charger->master, &charger->nb,
537 DA9030_EVENT_CHDET |
538 DA9030_EVENT_VBATMON |
539 DA9030_EVENT_CHIOVER |
540 DA9030_EVENT_TBAT);
541 if (ret)
542 goto err_notifier;
543
544 da9030_battery_setup_psy(charger);
545 psy_cfg.drv_data = charger;
546 charger->psy = power_supply_register(&pdev->dev, &charger->psy_desc,
547 &psy_cfg);
548 if (IS_ERR(charger->psy)) {
549 ret = PTR_ERR(charger->psy);
550 goto err_ps_register;
551 }
552
553 charger->debug_file = da9030_bat_create_debugfs(charger);
554 platform_set_drvdata(pdev, charger);
555 return 0;
556
557err_ps_register:
558 da903x_unregister_notifier(charger->master, &charger->nb,
559 DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
560 DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
561err_notifier:
562 cancel_delayed_work(&charger->work);
563
564err_charger_init:
565 return ret;
566}
567
568static int da9030_battery_remove(struct platform_device *dev)
569{
570 struct da9030_charger *charger = platform_get_drvdata(dev);
571
572 da9030_bat_remove_debugfs(charger);
573
574 da903x_unregister_notifier(charger->master, &charger->nb,
575 DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
576 DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
577 cancel_delayed_work_sync(&charger->work);
578 da9030_set_charge(charger, 0);
579 power_supply_unregister(charger->psy);
580
581 return 0;
582}
583
584static struct platform_driver da903x_battery_driver = {
585 .driver = {
586 .name = "da903x-battery",
587 },
588 .probe = da9030_battery_probe,
589 .remove = da9030_battery_remove,
590};
591
592module_platform_driver(da903x_battery_driver);
593
594MODULE_DESCRIPTION("DA9030 battery charger driver");
595MODULE_AUTHOR("Mike Rapoport, CompuLab");
596MODULE_LICENSE("GPL");
597
