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_FAULT_LOG 0x0a
26#define DA9030_FAULT_LOG_OVER_TEMP (1 << 7)
27#define DA9030_FAULT_LOG_VBAT_OVER (1 << 4)
28
29#define DA9030_CHARGE_CONTROL 0x28
30#define DA9030_CHRG_CHARGER_ENABLE (1 << 7)
31
32#define DA9030_ADC_MAN_CONTROL 0x30
33#define DA9030_ADC_TBATREF_ENABLE (1 << 5)
34#define DA9030_ADC_LDO_INT_ENABLE (1 << 4)
35
36#define DA9030_ADC_AUTO_CONTROL 0x31
37#define DA9030_ADC_TBAT_ENABLE (1 << 5)
38#define DA9030_ADC_VBAT_IN_TXON (1 << 4)
39#define DA9030_ADC_VCH_ENABLE (1 << 3)
40#define DA9030_ADC_ICH_ENABLE (1 << 2)
41#define DA9030_ADC_VBAT_ENABLE (1 << 1)
42#define DA9030_ADC_AUTO_SLEEP_ENABLE (1 << 0)
43
44#define DA9030_VBATMON 0x32
45#define DA9030_VBATMONTXON 0x33
46#define DA9030_TBATHIGHP 0x34
47#define DA9030_TBATHIGHN 0x35
48#define DA9030_TBATLOW 0x36
49
50#define DA9030_VBAT_RES 0x41
51#define DA9030_VBATMIN_RES 0x42
52#define DA9030_VBATMINTXON_RES 0x43
53#define DA9030_ICHMAX_RES 0x44
54#define DA9030_ICHMIN_RES 0x45
55#define DA9030_ICHAVERAGE_RES 0x46
56#define DA9030_VCHMAX_RES 0x47
57#define DA9030_VCHMIN_RES 0x48
58#define DA9030_TBAT_RES 0x49
59
60struct da9030_adc_res {
61 uint8_t vbat_res;
62 uint8_t vbatmin_res;
63 uint8_t vbatmintxon;
64 uint8_t ichmax_res;
65 uint8_t ichmin_res;
66 uint8_t ichaverage_res;
67 uint8_t vchmax_res;
68 uint8_t vchmin_res;
69 uint8_t tbat_res;
70 uint8_t adc_in4_res;
71 uint8_t adc_in5_res;
72};
73
74struct da9030_battery_thresholds {
75 int tbat_low;
76 int tbat_high;
77 int tbat_restart;
78
79 int vbat_low;
80 int vbat_crit;
81 int vbat_charge_start;
82 int vbat_charge_stop;
83 int vbat_charge_restart;
84
85 int vcharge_min;
86 int vcharge_max;
87};
88
89struct da9030_charger {
90 struct power_supply psy;
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
175static int debug_open(struct inode *inode, struct file *file)
176{
177 return single_open(file, bat_debug_show, inode->i_private);
178}
179
180static const struct file_operations bat_debug_fops = {
181 .open = debug_open,
182 .read = seq_read,
183 .llseek = seq_lseek,
184 .release = single_release,
185};
186
187static struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
188{
189 charger->debug_file = debugfs_create_file("charger", 0666, 0, charger,
190 &bat_debug_fops);
191 return charger->debug_file;
192}
193
194static void da9030_bat_remove_debugfs(struct da9030_charger *charger)
195{
196 debugfs_remove(charger->debug_file);
197}
198#else
199static inline struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
200{
201 return NULL;
202}
203static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger)
204{
205}
206#endif
207
208static inline void da9030_read_adc(struct da9030_charger *charger,
209 struct da9030_adc_res *adc)
210{
211 da903x_reads(charger->master, DA9030_VBAT_RES,
212 sizeof(*adc), (uint8_t *)adc);
213}
214
215static void da9030_charger_update_state(struct da9030_charger *charger)
216{
217 uint8_t val;
218
219 da903x_read(charger->master, DA9030_CHARGE_CONTROL, &val);
220 charger->is_on = (val & DA9030_CHRG_CHARGER_ENABLE) ? 1 : 0;
221 charger->mA = ((val >> 3) & 0xf) * 100;
222 charger->mV = (val & 0x7) * 50 + 4000;
223
224 da9030_read_adc(charger, &charger->adc);
225 da903x_read(charger->master, DA9030_FAULT_LOG, &charger->fault);
226 charger->chdet = da903x_query_status(charger->master,
227 DA9030_STATUS_CHDET);
228}
229
230static void da9030_set_charge(struct da9030_charger *charger, int on)
231{
232 uint8_t val;
233
234 if (on) {
235 val = DA9030_CHRG_CHARGER_ENABLE;
236 val |= (charger->charge_milliamp / 100) << 3;
237 val |= (charger->charge_millivolt - 4000) / 50;
238 charger->is_on = 1;
239 } else {
240 val = 0;
241 charger->is_on = 0;
242 }
243
244 da903x_write(charger->master, DA9030_CHARGE_CONTROL, val);
245
246 power_supply_changed(&charger->psy);
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 /* Charger has been pulled out */
262 if (!charger->chdet) {
263 da9030_set_charge(charger, 0);
264 return;
265 }
266
267 if (charger->adc.vbat_res >=
268 charger->thresholds.vbat_charge_stop) {
269 da9030_set_charge(charger, 0);
270 da903x_write(charger->master, DA9030_VBATMON,
271 charger->thresholds.vbat_charge_restart);
272 } else if (charger->adc.vbat_res >
273 charger->thresholds.vbat_low) {
274 /* we are charging and passed LOW_THRESH,
275 so upate DA9030 VBAT threshold
276 */
277 da903x_write(charger->master, DA9030_VBATMON,
278 charger->thresholds.vbat_low);
279 }
280 if (charger->adc.vchmax_res > charger->thresholds.vcharge_max ||
281 charger->adc.vchmin_res < charger->thresholds.vcharge_min ||
282 /* Tempreture readings are negative */
283 charger->adc.tbat_res < charger->thresholds.tbat_high ||
284 charger->adc.tbat_res > charger->thresholds.tbat_low) {
285 /* disable charger */
286 da9030_set_charge(charger, 0);
287 }
288 }
289}
290
291static void da9030_charging_monitor(struct work_struct *work)
292{
293 struct da9030_charger *charger;
294
295 charger = container_of(work, struct da9030_charger, work.work);
296
297 da9030_charger_check_state(charger);
298
299 /* reschedule for the next time */
300 schedule_delayed_work(&charger->work, charger->interval);
301}
302
303static enum power_supply_property da9030_battery_props[] = {
304 POWER_SUPPLY_PROP_MODEL_NAME,
305 POWER_SUPPLY_PROP_STATUS,
306 POWER_SUPPLY_PROP_HEALTH,
307 POWER_SUPPLY_PROP_TECHNOLOGY,
308 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
309 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
310 POWER_SUPPLY_PROP_VOLTAGE_NOW,
311 POWER_SUPPLY_PROP_CURRENT_AVG,
312};
313
314static void da9030_battery_check_status(struct da9030_charger *charger,
315 union power_supply_propval *val)
316{
317 if (charger->chdet) {
318 if (charger->is_on)
319 val->intval = POWER_SUPPLY_STATUS_CHARGING;
320 else
321 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
322 } else {
323 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
324 }
325}
326
327static void da9030_battery_check_health(struct da9030_charger *charger,
328 union power_supply_propval *val)
329{
330 if (charger->fault & DA9030_FAULT_LOG_OVER_TEMP)
331 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
332 else if (charger->fault & DA9030_FAULT_LOG_VBAT_OVER)
333 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
334 else
335 val->intval = POWER_SUPPLY_HEALTH_GOOD;
336}
337
338static int da9030_battery_get_property(struct power_supply *psy,
339 enum power_supply_property psp,
340 union power_supply_propval *val)
341{
342 struct da9030_charger *charger;
343 charger = container_of(psy, struct da9030_charger, psy);
344
345 switch (psp) {
346 case POWER_SUPPLY_PROP_STATUS:
347 da9030_battery_check_status(charger, val);
348 break;
349 case POWER_SUPPLY_PROP_HEALTH:
350 da9030_battery_check_health(charger, val);
351 break;
352 case POWER_SUPPLY_PROP_TECHNOLOGY:
353 val->intval = charger->battery_info->technology;
354 break;
355 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
356 val->intval = charger->battery_info->voltage_max_design;
357 break;
358 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
359 val->intval = charger->battery_info->voltage_min_design;
360 break;
361 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
362 val->intval = da9030_reg_to_mV(charger->adc.vbat_res) * 1000;
363 break;
364 case POWER_SUPPLY_PROP_CURRENT_AVG:
365 val->intval =
366 da9030_reg_to_mA(charger->adc.ichaverage_res) * 1000;
367 break;
368 case POWER_SUPPLY_PROP_MODEL_NAME:
369 val->strval = charger->battery_info->name;
370 break;
371 default:
372 break;
373 }
374
375 return 0;
376}
377
378static void da9030_battery_vbat_event(struct da9030_charger *charger)
379{
380 da9030_read_adc(charger, &charger->adc);
381
382 if (charger->is_on)
383 return;
384
385 if (charger->adc.vbat_res < charger->thresholds.vbat_low) {
386 /* set VBAT threshold for critical */
387 da903x_write(charger->master, DA9030_VBATMON,
388 charger->thresholds.vbat_crit);
389 if (charger->battery_low)
390 charger->battery_low();
391 } else if (charger->adc.vbat_res <
392 charger->thresholds.vbat_crit) {
393 /* notify the system of battery critical */
394 if (charger->battery_critical)
395 charger->battery_critical();
396 }
397}
398
399static int da9030_battery_event(struct notifier_block *nb, unsigned long event,
400 void *data)
401{
402 struct da9030_charger *charger =
403 container_of(nb, struct da9030_charger, nb);
404
405 switch (event) {
406 case DA9030_EVENT_CHDET:
407 cancel_delayed_work_sync(&charger->work);
408 schedule_work(&charger->work.work);
409 break;
410 case DA9030_EVENT_VBATMON:
411 da9030_battery_vbat_event(charger);
412 break;
413 case DA9030_EVENT_CHIOVER:
414 case DA9030_EVENT_TBAT:
415 da9030_set_charge(charger, 0);
416 break;
417 }
418
419 return 0;
420}
421
422static void da9030_battery_convert_thresholds(struct da9030_charger *charger,
423 struct da9030_battery_info *pdata)
424{
425 charger->thresholds.tbat_low = pdata->tbat_low;
426 charger->thresholds.tbat_high = pdata->tbat_high;
427 charger->thresholds.tbat_restart = pdata->tbat_restart;
428
429 charger->thresholds.vbat_low =
430 da9030_millivolt_to_reg(pdata->vbat_low);
431 charger->thresholds.vbat_crit =
432 da9030_millivolt_to_reg(pdata->vbat_crit);
433 charger->thresholds.vbat_charge_start =
434 da9030_millivolt_to_reg(pdata->vbat_charge_start);
435 charger->thresholds.vbat_charge_stop =
436 da9030_millivolt_to_reg(pdata->vbat_charge_stop);
437 charger->thresholds.vbat_charge_restart =
438 da9030_millivolt_to_reg(pdata->vbat_charge_restart);
439
440 charger->thresholds.vcharge_min =
441 da9030_millivolt_to_reg(pdata->vcharge_min);
442 charger->thresholds.vcharge_max =
443 da9030_millivolt_to_reg(pdata->vcharge_max);
444}
445
446static void da9030_battery_setup_psy(struct da9030_charger *charger)
447{
448 struct power_supply *psy = &charger->psy;
449 struct power_supply_info *info = charger->battery_info;
450
451 psy->name = info->name;
452 psy->use_for_apm = info->use_for_apm;
453 psy->type = POWER_SUPPLY_TYPE_BATTERY;
454 psy->get_property = da9030_battery_get_property;
455
456 psy->properties = da9030_battery_props;
457 psy->num_properties = ARRAY_SIZE(da9030_battery_props);
458};
459
460static int da9030_battery_charger_init(struct da9030_charger *charger)
461{
462 char v[5];
463 int ret;
464
465 v[0] = v[1] = charger->thresholds.vbat_low;
466 v[2] = charger->thresholds.tbat_high;
467 v[3] = charger->thresholds.tbat_restart;
468 v[4] = charger->thresholds.tbat_low;
469
470 ret = da903x_writes(charger->master, DA9030_VBATMON, 5, v);
471 if (ret)
472 return ret;
473
474 /*
475 * Enable reference voltage supply for ADC from the LDO_INTERNAL
476 * regulator. Must be set before ADC measurements can be made.
477 */
478 ret = da903x_write(charger->master, DA9030_ADC_MAN_CONTROL,
479 DA9030_ADC_LDO_INT_ENABLE |
480 DA9030_ADC_TBATREF_ENABLE);
481 if (ret)
482 return ret;
483
484 /* enable auto ADC measuremnts */
485 return da903x_write(charger->master, DA9030_ADC_AUTO_CONTROL,
486 DA9030_ADC_TBAT_ENABLE | DA9030_ADC_VBAT_IN_TXON |
487 DA9030_ADC_VCH_ENABLE | DA9030_ADC_ICH_ENABLE |
488 DA9030_ADC_VBAT_ENABLE |
489 DA9030_ADC_AUTO_SLEEP_ENABLE);
490}
491
492static int da9030_battery_probe(struct platform_device *pdev)
493{
494 struct da9030_charger *charger;
495 struct da9030_battery_info *pdata = pdev->dev.platform_data;
496 int ret;
497
498 if (pdata == NULL)
499 return -EINVAL;
500
501 if (pdata->charge_milliamp >= 1500 ||
502 pdata->charge_millivolt < 4000 ||
503 pdata->charge_millivolt > 4350)
504 return -EINVAL;
505
506 charger = kzalloc(sizeof(*charger), GFP_KERNEL);
507 if (charger == NULL)
508 return -ENOMEM;
509
510 charger->master = pdev->dev.parent;
511
512 /* 10 seconds between monotor runs unless platfrom defines other
513 interval */
514 charger->interval = msecs_to_jiffies(
515 (pdata->batmon_interval ? : 10) * 1000);
516
517 charger->charge_milliamp = pdata->charge_milliamp;
518 charger->charge_millivolt = pdata->charge_millivolt;
519 charger->battery_info = pdata->battery_info;
520 charger->battery_low = pdata->battery_low;
521 charger->battery_critical = pdata->battery_critical;
522
523 da9030_battery_convert_thresholds(charger, pdata);
524
525 ret = da9030_battery_charger_init(charger);
526 if (ret)
527 goto err_charger_init;
528
529 INIT_DELAYED_WORK(&charger->work, da9030_charging_monitor);
530 schedule_delayed_work(&charger->work, charger->interval);
531
532 charger->nb.notifier_call = da9030_battery_event;
533 ret = da903x_register_notifier(charger->master, &charger->nb,
534 DA9030_EVENT_CHDET |
535 DA9030_EVENT_VBATMON |
536 DA9030_EVENT_CHIOVER |
537 DA9030_EVENT_TBAT);
538 if (ret)
539 goto err_notifier;
540
541 da9030_battery_setup_psy(charger);
542 ret = power_supply_register(&pdev->dev, &charger->psy);
543 if (ret)
544 goto err_ps_register;
545
546 charger->debug_file = da9030_bat_create_debugfs(charger);
547 platform_set_drvdata(pdev, charger);
548 return 0;
549
550err_ps_register:
551 da903x_unregister_notifier(charger->master, &charger->nb,
552 DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
553 DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
554err_notifier:
555 cancel_delayed_work(&charger->work);
556
557err_charger_init:
558 kfree(charger);
559
560 return ret;
561}
562
563static int da9030_battery_remove(struct platform_device *dev)
564{
565 struct da9030_charger *charger = platform_get_drvdata(dev);
566
567 da9030_bat_remove_debugfs(charger);
568
569 da903x_unregister_notifier(charger->master, &charger->nb,
570 DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
571 DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
572 cancel_delayed_work_sync(&charger->work);
573 da9030_set_charge(charger, 0);
574 power_supply_unregister(&charger->psy);
575
576 kfree(charger);
577
578 return 0;
579}
580
581static struct platform_driver da903x_battery_driver = {
582 .driver = {
583 .name = "da903x-battery",
584 .owner = THIS_MODULE,
585 },
586 .probe = da9030_battery_probe,
587 .remove = da9030_battery_remove,
588};
589
590static int da903x_battery_init(void)
591{
592 return platform_driver_register(&da903x_battery_driver);
593}
594
595static void da903x_battery_exit(void)
596{
597 platform_driver_unregister(&da903x_battery_driver);
598}
599
600module_init(da903x_battery_init);
601module_exit(da903x_battery_exit);
602
603MODULE_DESCRIPTION("DA9030 battery charger driver");
604MODULE_AUTHOR("Mike Rapoport, CompuLab");
605MODULE_LICENSE("GPL");