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Mike Rapoport342d7652008-12-30 22:44:53 +01001/*
2 * Battery charger driver for Dialog Semiconductor DA9030
3 *
4 * Copyright (C) 2008 Compulab, Ltd.
5 * Mike Rapoport <mike@compulab.co.il>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/kernel.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Mike Rapoport342d7652008-12-30 22:44:53 +010014#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
Mike Rapoport342d7652008-12-30 22:44:53 +010026#define DA9030_FAULT_LOG 0x0a
27#define DA9030_FAULT_LOG_OVER_TEMP (1 << 7)
28#define DA9030_FAULT_LOG_VBAT_OVER (1 << 4)
29
30#define DA9030_CHARGE_CONTROL 0x28
31#define DA9030_CHRG_CHARGER_ENABLE (1 << 7)
32
33#define DA9030_ADC_MAN_CONTROL 0x30
34#define DA9030_ADC_TBATREF_ENABLE (1 << 5)
35#define DA9030_ADC_LDO_INT_ENABLE (1 << 4)
36
37#define DA9030_ADC_AUTO_CONTROL 0x31
38#define DA9030_ADC_TBAT_ENABLE (1 << 5)
39#define DA9030_ADC_VBAT_IN_TXON (1 << 4)
40#define DA9030_ADC_VCH_ENABLE (1 << 3)
41#define DA9030_ADC_ICH_ENABLE (1 << 2)
42#define DA9030_ADC_VBAT_ENABLE (1 << 1)
43#define DA9030_ADC_AUTO_SLEEP_ENABLE (1 << 0)
44
45#define DA9030_VBATMON 0x32
46#define DA9030_VBATMONTXON 0x33
47#define DA9030_TBATHIGHP 0x34
48#define DA9030_TBATHIGHN 0x35
49#define DA9030_TBATLOW 0x36
50
51#define DA9030_VBAT_RES 0x41
52#define DA9030_VBATMIN_RES 0x42
53#define DA9030_VBATMINTXON_RES 0x43
54#define DA9030_ICHMAX_RES 0x44
55#define DA9030_ICHMIN_RES 0x45
56#define DA9030_ICHAVERAGE_RES 0x46
57#define DA9030_VCHMAX_RES 0x47
58#define DA9030_VCHMIN_RES 0x48
59#define DA9030_TBAT_RES 0x49
60
61struct da9030_adc_res {
62 uint8_t vbat_res;
63 uint8_t vbatmin_res;
64 uint8_t vbatmintxon;
65 uint8_t ichmax_res;
66 uint8_t ichmin_res;
67 uint8_t ichaverage_res;
68 uint8_t vchmax_res;
69 uint8_t vchmin_res;
70 uint8_t tbat_res;
71 uint8_t adc_in4_res;
72 uint8_t adc_in5_res;
73};
74
75struct da9030_battery_thresholds {
76 int tbat_low;
77 int tbat_high;
78 int tbat_restart;
79
80 int vbat_low;
81 int vbat_crit;
82 int vbat_charge_start;
83 int vbat_charge_stop;
84 int vbat_charge_restart;
85
86 int vcharge_min;
87 int vcharge_max;
88};
89
90struct da9030_charger {
91 struct power_supply psy;
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", charger->is_on ? "on" : "off");
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
176static int debug_open(struct inode *inode, struct file *file)
177{
178 return single_open(file, bat_debug_show, inode->i_private);
179}
180
181static const struct file_operations bat_debug_fops = {
182 .open = debug_open,
183 .read = seq_read,
184 .llseek = seq_lseek,
185 .release = single_release,
186};
187
188static struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
189{
190 charger->debug_file = debugfs_create_file("charger", 0666, 0, charger,
191 &bat_debug_fops);
192 return charger->debug_file;
193}
194
195static void da9030_bat_remove_debugfs(struct da9030_charger *charger)
196{
197 debugfs_remove(charger->debug_file);
198}
199#else
200static inline struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
201{
202 return NULL;
203}
204static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger)
205{
206}
207#endif
208
209static inline void da9030_read_adc(struct da9030_charger *charger,
210 struct da9030_adc_res *adc)
211{
212 da903x_reads(charger->master, DA9030_VBAT_RES,
213 sizeof(*adc), (uint8_t *)adc);
214}
215
216static void da9030_charger_update_state(struct da9030_charger *charger)
217{
218 uint8_t val;
219
220 da903x_read(charger->master, DA9030_CHARGE_CONTROL, &val);
221 charger->is_on = (val & DA9030_CHRG_CHARGER_ENABLE) ? 1 : 0;
222 charger->mA = ((val >> 3) & 0xf) * 100;
223 charger->mV = (val & 0x7) * 50 + 4000;
224
225 da9030_read_adc(charger, &charger->adc);
226 da903x_read(charger->master, DA9030_FAULT_LOG, &charger->fault);
227 charger->chdet = da903x_query_status(charger->master,
228 DA9030_STATUS_CHDET);
229}
230
231static void da9030_set_charge(struct da9030_charger *charger, int on)
232{
233 uint8_t val;
234
235 if (on) {
236 val = DA9030_CHRG_CHARGER_ENABLE;
237 val |= (charger->charge_milliamp / 100) << 3;
238 val |= (charger->charge_millivolt - 4000) / 50;
239 charger->is_on = 1;
240 } else {
241 val = 0;
242 charger->is_on = 0;
243 }
244
245 da903x_write(charger->master, DA9030_CHARGE_CONTROL, val);
Mike Rapoporta35d01a2009-06-09 01:09:45 +0400246
247 power_supply_changed(&charger->psy);
Mike Rapoport342d7652008-12-30 22:44:53 +0100248}
249
250static void da9030_charger_check_state(struct da9030_charger *charger)
251{
252 da9030_charger_update_state(charger);
253
254 /* we wake or boot with external power on */
255 if (!charger->is_on) {
256 if ((charger->chdet) &&
257 (charger->adc.vbat_res <
258 charger->thresholds.vbat_charge_start)) {
259 da9030_set_charge(charger, 1);
260 }
261 } else {
Mike Rapoporta35d01a2009-06-09 01:09:45 +0400262 /* Charger has been pulled out */
263 if (!charger->chdet) {
264 da9030_set_charge(charger, 0);
265 return;
266 }
267
Mike Rapoport342d7652008-12-30 22:44:53 +0100268 if (charger->adc.vbat_res >=
269 charger->thresholds.vbat_charge_stop) {
270 da9030_set_charge(charger, 0);
271 da903x_write(charger->master, DA9030_VBATMON,
272 charger->thresholds.vbat_charge_restart);
273 } else if (charger->adc.vbat_res >
274 charger->thresholds.vbat_low) {
275 /* we are charging and passed LOW_THRESH,
276 so upate DA9030 VBAT threshold
277 */
278 da903x_write(charger->master, DA9030_VBATMON,
279 charger->thresholds.vbat_low);
280 }
281 if (charger->adc.vchmax_res > charger->thresholds.vcharge_max ||
282 charger->adc.vchmin_res < charger->thresholds.vcharge_min ||
283 /* Tempreture readings are negative */
284 charger->adc.tbat_res < charger->thresholds.tbat_high ||
285 charger->adc.tbat_res > charger->thresholds.tbat_low) {
286 /* disable charger */
287 da9030_set_charge(charger, 0);
288 }
289 }
290}
291
292static void da9030_charging_monitor(struct work_struct *work)
293{
294 struct da9030_charger *charger;
295
296 charger = container_of(work, struct da9030_charger, work.work);
297
298 da9030_charger_check_state(charger);
299
300 /* reschedule for the next time */
301 schedule_delayed_work(&charger->work, charger->interval);
302}
303
304static enum power_supply_property da9030_battery_props[] = {
305 POWER_SUPPLY_PROP_MODEL_NAME,
306 POWER_SUPPLY_PROP_STATUS,
307 POWER_SUPPLY_PROP_HEALTH,
308 POWER_SUPPLY_PROP_TECHNOLOGY,
309 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
310 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
311 POWER_SUPPLY_PROP_VOLTAGE_NOW,
312 POWER_SUPPLY_PROP_CURRENT_AVG,
313};
314
315static void da9030_battery_check_status(struct da9030_charger *charger,
316 union power_supply_propval *val)
317{
318 if (charger->chdet) {
319 if (charger->is_on)
320 val->intval = POWER_SUPPLY_STATUS_CHARGING;
321 else
322 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
323 } else {
324 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
325 }
326}
327
328static void da9030_battery_check_health(struct da9030_charger *charger,
329 union power_supply_propval *val)
330{
331 if (charger->fault & DA9030_FAULT_LOG_OVER_TEMP)
332 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
333 else if (charger->fault & DA9030_FAULT_LOG_VBAT_OVER)
334 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
335 else
336 val->intval = POWER_SUPPLY_HEALTH_GOOD;
337}
338
339static int da9030_battery_get_property(struct power_supply *psy,
340 enum power_supply_property psp,
341 union power_supply_propval *val)
342{
343 struct da9030_charger *charger;
344 charger = container_of(psy, struct da9030_charger, psy);
345
346 switch (psp) {
347 case POWER_SUPPLY_PROP_STATUS:
348 da9030_battery_check_status(charger, val);
349 break;
350 case POWER_SUPPLY_PROP_HEALTH:
351 da9030_battery_check_health(charger, val);
352 break;
353 case POWER_SUPPLY_PROP_TECHNOLOGY:
354 val->intval = charger->battery_info->technology;
355 break;
356 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
357 val->intval = charger->battery_info->voltage_max_design;
358 break;
359 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
360 val->intval = charger->battery_info->voltage_min_design;
361 break;
362 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
363 val->intval = da9030_reg_to_mV(charger->adc.vbat_res) * 1000;
364 break;
365 case POWER_SUPPLY_PROP_CURRENT_AVG:
366 val->intval =
367 da9030_reg_to_mA(charger->adc.ichaverage_res) * 1000;
368 break;
369 case POWER_SUPPLY_PROP_MODEL_NAME:
370 val->strval = charger->battery_info->name;
371 break;
372 default:
373 break;
374 }
375
376 return 0;
377}
378
379static void da9030_battery_vbat_event(struct da9030_charger *charger)
380{
381 da9030_read_adc(charger, &charger->adc);
382
383 if (charger->is_on)
384 return;
385
386 if (charger->adc.vbat_res < charger->thresholds.vbat_low) {
387 /* set VBAT threshold for critical */
388 da903x_write(charger->master, DA9030_VBATMON,
389 charger->thresholds.vbat_crit);
390 if (charger->battery_low)
391 charger->battery_low();
392 } else if (charger->adc.vbat_res <
393 charger->thresholds.vbat_crit) {
394 /* notify the system of battery critical */
395 if (charger->battery_critical)
396 charger->battery_critical();
397 }
398}
399
400static int da9030_battery_event(struct notifier_block *nb, unsigned long event,
401 void *data)
402{
403 struct da9030_charger *charger =
404 container_of(nb, struct da9030_charger, nb);
Mike Rapoport342d7652008-12-30 22:44:53 +0100405
406 switch (event) {
407 case DA9030_EVENT_CHDET:
Mike Rapoporta35d01a2009-06-09 01:09:45 +0400408 cancel_delayed_work_sync(&charger->work);
409 schedule_work(&charger->work.work);
Mike Rapoport342d7652008-12-30 22:44:53 +0100410 break;
411 case DA9030_EVENT_VBATMON:
412 da9030_battery_vbat_event(charger);
413 break;
414 case DA9030_EVENT_CHIOVER:
415 case DA9030_EVENT_TBAT:
416 da9030_set_charge(charger, 0);
417 break;
418 }
419
420 return 0;
421}
422
423static void da9030_battery_convert_thresholds(struct da9030_charger *charger,
424 struct da9030_battery_info *pdata)
425{
426 charger->thresholds.tbat_low = pdata->tbat_low;
427 charger->thresholds.tbat_high = pdata->tbat_high;
428 charger->thresholds.tbat_restart = pdata->tbat_restart;
429
430 charger->thresholds.vbat_low =
431 da9030_millivolt_to_reg(pdata->vbat_low);
432 charger->thresholds.vbat_crit =
433 da9030_millivolt_to_reg(pdata->vbat_crit);
434 charger->thresholds.vbat_charge_start =
435 da9030_millivolt_to_reg(pdata->vbat_charge_start);
436 charger->thresholds.vbat_charge_stop =
437 da9030_millivolt_to_reg(pdata->vbat_charge_stop);
438 charger->thresholds.vbat_charge_restart =
439 da9030_millivolt_to_reg(pdata->vbat_charge_restart);
440
441 charger->thresholds.vcharge_min =
442 da9030_millivolt_to_reg(pdata->vcharge_min);
443 charger->thresholds.vcharge_max =
444 da9030_millivolt_to_reg(pdata->vcharge_max);
445}
446
447static void da9030_battery_setup_psy(struct da9030_charger *charger)
448{
449 struct power_supply *psy = &charger->psy;
450 struct power_supply_info *info = charger->battery_info;
451
452 psy->name = info->name;
453 psy->use_for_apm = info->use_for_apm;
454 psy->type = POWER_SUPPLY_TYPE_BATTERY;
455 psy->get_property = da9030_battery_get_property;
456
457 psy->properties = da9030_battery_props;
458 psy->num_properties = ARRAY_SIZE(da9030_battery_props);
459};
460
461static int da9030_battery_charger_init(struct da9030_charger *charger)
462{
463 char v[5];
464 int ret;
465
466 v[0] = v[1] = charger->thresholds.vbat_low;
467 v[2] = charger->thresholds.tbat_high;
468 v[3] = charger->thresholds.tbat_restart;
469 v[4] = charger->thresholds.tbat_low;
470
471 ret = da903x_writes(charger->master, DA9030_VBATMON, 5, v);
472 if (ret)
473 return ret;
474
475 /*
476 * Enable reference voltage supply for ADC from the LDO_INTERNAL
477 * regulator. Must be set before ADC measurements can be made.
478 */
479 ret = da903x_write(charger->master, DA9030_ADC_MAN_CONTROL,
480 DA9030_ADC_LDO_INT_ENABLE |
481 DA9030_ADC_TBATREF_ENABLE);
482 if (ret)
483 return ret;
484
485 /* enable auto ADC measuremnts */
486 return da903x_write(charger->master, DA9030_ADC_AUTO_CONTROL,
487 DA9030_ADC_TBAT_ENABLE | DA9030_ADC_VBAT_IN_TXON |
488 DA9030_ADC_VCH_ENABLE | DA9030_ADC_ICH_ENABLE |
489 DA9030_ADC_VBAT_ENABLE |
490 DA9030_ADC_AUTO_SLEEP_ENABLE);
491}
492
493static int da9030_battery_probe(struct platform_device *pdev)
494{
495 struct da9030_charger *charger;
496 struct da9030_battery_info *pdata = pdev->dev.platform_data;
497 int ret;
498
499 if (pdata == NULL)
500 return -EINVAL;
501
502 if (pdata->charge_milliamp >= 1500 ||
503 pdata->charge_millivolt < 4000 ||
504 pdata->charge_millivolt > 4350)
505 return -EINVAL;
506
507 charger = kzalloc(sizeof(*charger), GFP_KERNEL);
508 if (charger == NULL)
509 return -ENOMEM;
510
511 charger->master = pdev->dev.parent;
512
Stefan Weil5324dc02010-02-02 14:45:04 -0800513 /* 10 seconds between monitor runs unless platform defines other
Mike Rapoport342d7652008-12-30 22:44:53 +0100514 interval */
515 charger->interval = msecs_to_jiffies(
516 (pdata->batmon_interval ? : 10) * 1000);
517
518 charger->charge_milliamp = pdata->charge_milliamp;
519 charger->charge_millivolt = pdata->charge_millivolt;
520 charger->battery_info = pdata->battery_info;
521 charger->battery_low = pdata->battery_low;
522 charger->battery_critical = pdata->battery_critical;
523
524 da9030_battery_convert_thresholds(charger, pdata);
525
526 ret = da9030_battery_charger_init(charger);
527 if (ret)
528 goto err_charger_init;
529
530 INIT_DELAYED_WORK(&charger->work, da9030_charging_monitor);
531 schedule_delayed_work(&charger->work, charger->interval);
532
533 charger->nb.notifier_call = da9030_battery_event;
534 ret = da903x_register_notifier(charger->master, &charger->nb,
535 DA9030_EVENT_CHDET |
536 DA9030_EVENT_VBATMON |
537 DA9030_EVENT_CHIOVER |
538 DA9030_EVENT_TBAT);
539 if (ret)
540 goto err_notifier;
541
542 da9030_battery_setup_psy(charger);
543 ret = power_supply_register(&pdev->dev, &charger->psy);
544 if (ret)
545 goto err_ps_register;
546
547 charger->debug_file = da9030_bat_create_debugfs(charger);
548 platform_set_drvdata(pdev, charger);
549 return 0;
550
551err_ps_register:
552 da903x_unregister_notifier(charger->master, &charger->nb,
553 DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
554 DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
555err_notifier:
556 cancel_delayed_work(&charger->work);
557
558err_charger_init:
559 kfree(charger);
560
561 return ret;
562}
563
564static int da9030_battery_remove(struct platform_device *dev)
565{
566 struct da9030_charger *charger = platform_get_drvdata(dev);
567
568 da9030_bat_remove_debugfs(charger);
569
570 da903x_unregister_notifier(charger->master, &charger->nb,
571 DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
572 DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
Mike Rapoporta35d01a2009-06-09 01:09:45 +0400573 cancel_delayed_work_sync(&charger->work);
574 da9030_set_charge(charger, 0);
Mike Rapoport342d7652008-12-30 22:44:53 +0100575 power_supply_unregister(&charger->psy);
576
577 kfree(charger);
578
579 return 0;
580}
581
582static struct platform_driver da903x_battery_driver = {
583 .driver = {
584 .name = "da903x-battery",
585 .owner = THIS_MODULE,
586 },
587 .probe = da9030_battery_probe,
588 .remove = da9030_battery_remove,
589};
590
Axel Lin300bac72011-11-26 12:01:10 +0800591module_platform_driver(da903x_battery_driver);
Mike Rapoport342d7652008-12-30 22:44:53 +0100592
593MODULE_DESCRIPTION("DA9030 battery charger driver");
594MODULE_AUTHOR("Mike Rapoport, CompuLab");
595MODULE_LICENSE("GPL");