tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
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>
13#include <linux/init.h>
14#include <linux/types.h>
15#include <linux/device.h>
16#include <linux/workqueue.h>
17#include <linux/module.h>
18#include <linux/platform_device.h>
19#include <linux/power_supply.h>
20#include <linux/mfd/da903x.h>
21
22#include <linux/debugfs.h>
23#include <linux/seq_file.h>
24
25#define DA9030_STATUS_CHDET (1 << 3)
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
94 struct device *master;
95
96 struct da9030_adc_res adc;
97 struct delayed_work work;
98 unsigned int interval;
99
100 struct power_supply_info *battery_info;
101
102 struct da9030_battery_thresholds thresholds;
103
104 unsigned int charge_milliamp;
105 unsigned int charge_millivolt;
106
107 /* charger status */
108 bool chdet;
109 uint8_t fault;
110 int mA;
111 int mV;
112 bool is_on;
113
114 struct notifier_block nb;
115
116 /* platform callbacks for battery low and critical events */
117 void (*battery_low)(void);
118 void (*battery_critical)(void);
119
120 struct dentry *debug_file;
121};
122
123static inline int da9030_reg_to_mV(int reg)
124{
125 return ((reg * 2650) >> 8) + 2650;
126}
127
128static inline int da9030_millivolt_to_reg(int mV)
129{
130 return ((mV - 2650) << 8) / 2650;
131}
132
133static inline int da9030_reg_to_mA(int reg)
134{
135 return ((reg * 24000) >> 8) / 15;
136}
137
138#ifdef CONFIG_DEBUG_FS
139static int bat_debug_show(struct seq_file *s, void *data)
140{
141 struct da9030_charger *charger = s->private;
142
143 seq_printf(s, "charger is %s\n", charger->is_on ? "on" : "off");
144 if (charger->chdet) {
145 seq_printf(s, "iset = %dmA, vset = %dmV\n",
146 charger->mA, charger->mV);
147 }
148
149 seq_printf(s, "vbat_res = %d (%dmV)\n",
150 charger->adc.vbat_res,
151 da9030_reg_to_mV(charger->adc.vbat_res));
152 seq_printf(s, "vbatmin_res = %d (%dmV)\n",
153 charger->adc.vbatmin_res,
154 da9030_reg_to_mV(charger->adc.vbatmin_res));
155 seq_printf(s, "vbatmintxon = %d (%dmV)\n",
156 charger->adc.vbatmintxon,
157 da9030_reg_to_mV(charger->adc.vbatmintxon));
158 seq_printf(s, "ichmax_res = %d (%dmA)\n",
159 charger->adc.ichmax_res,
160 da9030_reg_to_mV(charger->adc.ichmax_res));
161 seq_printf(s, "ichmin_res = %d (%dmA)\n",
162 charger->adc.ichmin_res,
163 da9030_reg_to_mA(charger->adc.ichmin_res));
164 seq_printf(s, "ichaverage_res = %d (%dmA)\n",
165 charger->adc.ichaverage_res,
166 da9030_reg_to_mA(charger->adc.ichaverage_res));
167 seq_printf(s, "vchmax_res = %d (%dmV)\n",
168 charger->adc.vchmax_res,
169 da9030_reg_to_mA(charger->adc.vchmax_res));
170 seq_printf(s, "vchmin_res = %d (%dmV)\n",
171 charger->adc.vchmin_res,
172 da9030_reg_to_mV(charger->adc.vchmin_res));
173
174 return 0;
175}
176
177static int debug_open(struct inode *inode, struct file *file)
178{
179 return single_open(file, bat_debug_show, inode->i_private);
180}
181
182static const struct file_operations bat_debug_fops = {
183 .open = debug_open,
184 .read = seq_read,
185 .llseek = seq_lseek,
186 .release = single_release,
187};
188
189static struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
190{
191 charger->debug_file = debugfs_create_file("charger", 0666, 0, charger,
192 &bat_debug_fops);
193 return charger->debug_file;
194}
195
196static void da9030_bat_remove_debugfs(struct da9030_charger *charger)
197{
198 debugfs_remove(charger->debug_file);
199}
200#else
201static inline struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
202{
203 return NULL;
204}
205static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger)
206{
207}
208#endif
209
210static inline void da9030_read_adc(struct da9030_charger *charger,
211 struct da9030_adc_res *adc)
212{
213 da903x_reads(charger->master, DA9030_VBAT_RES,
214 sizeof(*adc), (uint8_t *)adc);
215}
216
217static void da9030_charger_update_state(struct da9030_charger *charger)
218{
219 uint8_t val;
220
221 da903x_read(charger->master, DA9030_CHARGE_CONTROL, &val);
222 charger->is_on = (val & DA9030_CHRG_CHARGER_ENABLE) ? 1 : 0;
223 charger->mA = ((val >> 3) & 0xf) * 100;
224 charger->mV = (val & 0x7) * 50 + 4000;
225
226 da9030_read_adc(charger, &charger->adc);
227 da903x_read(charger->master, DA9030_FAULT_LOG, &charger->fault);
228 charger->chdet = da903x_query_status(charger->master,
229 DA9030_STATUS_CHDET);
230}
231
232static void da9030_set_charge(struct da9030_charger *charger, int on)
233{
234 uint8_t val;
235
236 if (on) {
237 val = DA9030_CHRG_CHARGER_ENABLE;
238 val |= (charger->charge_milliamp / 100) << 3;
239 val |= (charger->charge_millivolt - 4000) / 50;
240 charger->is_on = 1;
241 } else {
242 val = 0;
243 charger->is_on = 0;
244 }
245
246 da903x_write(charger->master, DA9030_CHARGE_CONTROL, val);
247}
248
249static void da9030_charger_check_state(struct da9030_charger *charger)
250{
251 da9030_charger_update_state(charger);
252
253 /* we wake or boot with external power on */
254 if (!charger->is_on) {
255 if ((charger->chdet) &&
256 (charger->adc.vbat_res <
257 charger->thresholds.vbat_charge_start)) {
258 da9030_set_charge(charger, 1);
259 }
260 } else {
261 if (charger->adc.vbat_res >=
262 charger->thresholds.vbat_charge_stop) {
263 da9030_set_charge(charger, 0);
264 da903x_write(charger->master, DA9030_VBATMON,
265 charger->thresholds.vbat_charge_restart);
266 } else if (charger->adc.vbat_res >
267 charger->thresholds.vbat_low) {
268 /* we are charging and passed LOW_THRESH,
269 so upate DA9030 VBAT threshold
270 */
271 da903x_write(charger->master, DA9030_VBATMON,
272 charger->thresholds.vbat_low);
273 }
274 if (charger->adc.vchmax_res > charger->thresholds.vcharge_max ||
275 charger->adc.vchmin_res < charger->thresholds.vcharge_min ||
276 /* Tempreture readings are negative */
277 charger->adc.tbat_res < charger->thresholds.tbat_high ||
278 charger->adc.tbat_res > charger->thresholds.tbat_low) {
279 /* disable charger */
280 da9030_set_charge(charger, 0);
281 }
282 }
283}
284
285static void da9030_charging_monitor(struct work_struct *work)
286{
287 struct da9030_charger *charger;
288
289 charger = container_of(work, struct da9030_charger, work.work);
290
291 da9030_charger_check_state(charger);
292
293 /* reschedule for the next time */
294 schedule_delayed_work(&charger->work, charger->interval);
295}
296
297static enum power_supply_property da9030_battery_props[] = {
298 POWER_SUPPLY_PROP_MODEL_NAME,
299 POWER_SUPPLY_PROP_STATUS,
300 POWER_SUPPLY_PROP_HEALTH,
301 POWER_SUPPLY_PROP_TECHNOLOGY,
302 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
303 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
304 POWER_SUPPLY_PROP_VOLTAGE_NOW,
305 POWER_SUPPLY_PROP_CURRENT_AVG,
306};
307
308static void da9030_battery_check_status(struct da9030_charger *charger,
309 union power_supply_propval *val)
310{
311 if (charger->chdet) {
312 if (charger->is_on)
313 val->intval = POWER_SUPPLY_STATUS_CHARGING;
314 else
315 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
316 } else {
317 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
318 }
319}
320
321static void da9030_battery_check_health(struct da9030_charger *charger,
322 union power_supply_propval *val)
323{
324 if (charger->fault & DA9030_FAULT_LOG_OVER_TEMP)
325 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
326 else if (charger->fault & DA9030_FAULT_LOG_VBAT_OVER)
327 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
328 else
329 val->intval = POWER_SUPPLY_HEALTH_GOOD;
330}
331
332static int da9030_battery_get_property(struct power_supply *psy,
333 enum power_supply_property psp,
334 union power_supply_propval *val)
335{
336 struct da9030_charger *charger;
337 charger = container_of(psy, struct da9030_charger, psy);
338
339 switch (psp) {
340 case POWER_SUPPLY_PROP_STATUS:
341 da9030_battery_check_status(charger, val);
342 break;
343 case POWER_SUPPLY_PROP_HEALTH:
344 da9030_battery_check_health(charger, val);
345 break;
346 case POWER_SUPPLY_PROP_TECHNOLOGY:
347 val->intval = charger->battery_info->technology;
348 break;
349 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
350 val->intval = charger->battery_info->voltage_max_design;
351 break;
352 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
353 val->intval = charger->battery_info->voltage_min_design;
354 break;
355 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
356 val->intval = da9030_reg_to_mV(charger->adc.vbat_res) * 1000;
357 break;
358 case POWER_SUPPLY_PROP_CURRENT_AVG:
359 val->intval =
360 da9030_reg_to_mA(charger->adc.ichaverage_res) * 1000;
361 break;
362 case POWER_SUPPLY_PROP_MODEL_NAME:
363 val->strval = charger->battery_info->name;
364 break;
365 default:
366 break;
367 }
368
369 return 0;
370}
371
372static void da9030_battery_vbat_event(struct da9030_charger *charger)
373{
374 da9030_read_adc(charger, &charger->adc);
375
376 if (charger->is_on)
377 return;
378
379 if (charger->adc.vbat_res < charger->thresholds.vbat_low) {
380 /* set VBAT threshold for critical */
381 da903x_write(charger->master, DA9030_VBATMON,
382 charger->thresholds.vbat_crit);
383 if (charger->battery_low)
384 charger->battery_low();
385 } else if (charger->adc.vbat_res <
386 charger->thresholds.vbat_crit) {
387 /* notify the system of battery critical */
388 if (charger->battery_critical)
389 charger->battery_critical();
390 }
391}
392
393static int da9030_battery_event(struct notifier_block *nb, unsigned long event,
394 void *data)
395{
396 struct da9030_charger *charger =
397 container_of(nb, struct da9030_charger, nb);
398 int status;
399
400 switch (event) {
401 case DA9030_EVENT_CHDET:
402 status = da903x_query_status(charger->master,
403 DA9030_STATUS_CHDET);
404 da9030_set_charge(charger, status);
405 break;
406 case DA9030_EVENT_VBATMON:
407 da9030_battery_vbat_event(charger);
408 break;
409 case DA9030_EVENT_CHIOVER:
410 case DA9030_EVENT_TBAT:
411 da9030_set_charge(charger, 0);
412 break;
413 }
414
415 return 0;
416}
417
418static void da9030_battery_convert_thresholds(struct da9030_charger *charger,
419 struct da9030_battery_info *pdata)
420{
421 charger->thresholds.tbat_low = pdata->tbat_low;
422 charger->thresholds.tbat_high = pdata->tbat_high;
423 charger->thresholds.tbat_restart = pdata->tbat_restart;
424
425 charger->thresholds.vbat_low =
426 da9030_millivolt_to_reg(pdata->vbat_low);
427 charger->thresholds.vbat_crit =
428 da9030_millivolt_to_reg(pdata->vbat_crit);
429 charger->thresholds.vbat_charge_start =
430 da9030_millivolt_to_reg(pdata->vbat_charge_start);
431 charger->thresholds.vbat_charge_stop =
432 da9030_millivolt_to_reg(pdata->vbat_charge_stop);
433 charger->thresholds.vbat_charge_restart =
434 da9030_millivolt_to_reg(pdata->vbat_charge_restart);
435
436 charger->thresholds.vcharge_min =
437 da9030_millivolt_to_reg(pdata->vcharge_min);
438 charger->thresholds.vcharge_max =
439 da9030_millivolt_to_reg(pdata->vcharge_max);
440}
441
442static void da9030_battery_setup_psy(struct da9030_charger *charger)
443{
444 struct power_supply *psy = &charger->psy;
445 struct power_supply_info *info = charger->battery_info;
446
447 psy->name = info->name;
448 psy->use_for_apm = info->use_for_apm;
449 psy->type = POWER_SUPPLY_TYPE_BATTERY;
450 psy->get_property = da9030_battery_get_property;
451
452 psy->properties = da9030_battery_props;
453 psy->num_properties = ARRAY_SIZE(da9030_battery_props);
454};
455
456static int da9030_battery_charger_init(struct da9030_charger *charger)
457{
458 char v[5];
459 int ret;
460
461 v[0] = v[1] = charger->thresholds.vbat_low;
462 v[2] = charger->thresholds.tbat_high;
463 v[3] = charger->thresholds.tbat_restart;
464 v[4] = charger->thresholds.tbat_low;
465
466 ret = da903x_writes(charger->master, DA9030_VBATMON, 5, v);
467 if (ret)
468 return ret;
469
470 /*
471 * Enable reference voltage supply for ADC from the LDO_INTERNAL
472 * regulator. Must be set before ADC measurements can be made.
473 */
474 ret = da903x_write(charger->master, DA9030_ADC_MAN_CONTROL,
475 DA9030_ADC_LDO_INT_ENABLE |
476 DA9030_ADC_TBATREF_ENABLE);
477 if (ret)
478 return ret;
479
480 /* enable auto ADC measuremnts */
481 return da903x_write(charger->master, DA9030_ADC_AUTO_CONTROL,
482 DA9030_ADC_TBAT_ENABLE | DA9030_ADC_VBAT_IN_TXON |
483 DA9030_ADC_VCH_ENABLE | DA9030_ADC_ICH_ENABLE |
484 DA9030_ADC_VBAT_ENABLE |
485 DA9030_ADC_AUTO_SLEEP_ENABLE);
486}
487
488static int da9030_battery_probe(struct platform_device *pdev)
489{
490 struct da9030_charger *charger;
491 struct da9030_battery_info *pdata = pdev->dev.platform_data;
492 int ret;
493
494 if (pdata == NULL)
495 return -EINVAL;
496
497 if (pdata->charge_milliamp >= 1500 ||
498 pdata->charge_millivolt < 4000 ||
499 pdata->charge_millivolt > 4350)
500 return -EINVAL;
501
502 charger = kzalloc(sizeof(*charger), GFP_KERNEL);
503 if (charger == NULL)
504 return -ENOMEM;
505
506 charger->master = pdev->dev.parent;
507
508 /* 10 seconds between monotor runs unless platfrom defines other
509 interval */
510 charger->interval = msecs_to_jiffies(
511 (pdata->batmon_interval ? : 10) * 1000);
512
513 charger->charge_milliamp = pdata->charge_milliamp;
514 charger->charge_millivolt = pdata->charge_millivolt;
515 charger->battery_info = pdata->battery_info;
516 charger->battery_low = pdata->battery_low;
517 charger->battery_critical = pdata->battery_critical;
518
519 da9030_battery_convert_thresholds(charger, pdata);
520
521 ret = da9030_battery_charger_init(charger);
522 if (ret)
523 goto err_charger_init;
524
525 INIT_DELAYED_WORK(&charger->work, da9030_charging_monitor);
526 schedule_delayed_work(&charger->work, charger->interval);
527
528 charger->nb.notifier_call = da9030_battery_event;
529 ret = da903x_register_notifier(charger->master, &charger->nb,
530 DA9030_EVENT_CHDET |
531 DA9030_EVENT_VBATMON |
532 DA9030_EVENT_CHIOVER |
533 DA9030_EVENT_TBAT);
534 if (ret)
535 goto err_notifier;
536
537 da9030_battery_setup_psy(charger);
538 ret = power_supply_register(&pdev->dev, &charger->psy);
539 if (ret)
540 goto err_ps_register;
541
542 charger->debug_file = da9030_bat_create_debugfs(charger);
543 platform_set_drvdata(pdev, charger);
544 return 0;
545
546err_ps_register:
547 da903x_unregister_notifier(charger->master, &charger->nb,
548 DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
549 DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
550err_notifier:
551 cancel_delayed_work(&charger->work);
552
553err_charger_init:
554 kfree(charger);
555
556 return ret;
557}
558
559static int da9030_battery_remove(struct platform_device *dev)
560{
561 struct da9030_charger *charger = platform_get_drvdata(dev);
562
563 da9030_bat_remove_debugfs(charger);
564
565 da903x_unregister_notifier(charger->master, &charger->nb,
566 DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
567 DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
568 cancel_delayed_work(&charger->work);
569 power_supply_unregister(&charger->psy);
570
571 kfree(charger);
572
573 return 0;
574}
575
576static struct platform_driver da903x_battery_driver = {
577 .driver = {
578 .name = "da903x-battery",
579 .owner = THIS_MODULE,
580 },
581 .probe = da9030_battery_probe,
582 .remove = da9030_battery_remove,
583};
584
585static int da903x_battery_init(void)
586{
587 return platform_driver_register(&da903x_battery_driver);
588}
589
590static void da903x_battery_exit(void)
591{
592 platform_driver_unregister(&da903x_battery_driver);
593}
594
595module_init(da903x_battery_init);
596module_exit(da903x_battery_exit);
597
598MODULE_DESCRIPTION("DA9030 battery charger driver");
599MODULE_AUTHOR("Mike Rapoport, CompuLab");
600MODULE_LICENSE("GPL");