Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

Linux/drivers/power/da9030_battery.c

  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/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 
 62 struct 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 
 76 struct 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 
 91 struct 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         /* charger status */
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         /* platform callbacks for battery low and critical events */
118         void (*battery_low)(void);
119         void (*battery_critical)(void);
120 
121         struct dentry *debug_file;
122 };
123 
124 static inline int da9030_reg_to_mV(int reg)
125 {
126         return ((reg * 2650) >> 8) + 2650;
127 }
128 
129 static inline int da9030_millivolt_to_reg(int mV)
130 {
131         return ((mV - 2650) << 8) / 2650;
132 }
133 
134 static inline int da9030_reg_to_mA(int reg)
135 {
136         return ((reg * 24000) >> 8) / 15;
137 }
138 
139 #ifdef CONFIG_DEBUG_FS
140 static 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 
178 static int debug_open(struct inode *inode, struct file *file)
179 {
180         return single_open(file, bat_debug_show, inode->i_private);
181 }
182 
183 static 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 
190 static 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 
197 static void da9030_bat_remove_debugfs(struct da9030_charger *charger)
198 {
199         debugfs_remove(charger->debug_file);
200 }
201 #else
202 static inline struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
203 {
204         return NULL;
205 }
206 static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger)
207 {
208 }
209 #endif
210 
211 static 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 
218 static 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 
233 static 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 
252 static void da9030_charger_check_state(struct da9030_charger *charger)
253 {
254         da9030_charger_update_state(charger);
255 
256         /* we wake or boot with external power on */
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                 /* Charger has been pulled out */
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                         /* we are charging and passed LOW_THRESH,
278                            so upate DA9030 VBAT threshold
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                     /* Tempreture readings are negative */
286                     charger->adc.tbat_res < charger->thresholds.tbat_high ||
287                     charger->adc.tbat_res > charger->thresholds.tbat_low) {
288                         /* disable charger */
289                         da9030_set_charge(charger, 0);
290                 }
291         }
292 }
293 
294 static 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         /* reschedule for the next time */
303         schedule_delayed_work(&charger->work, charger->interval);
304 }
305 
306 static 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 
317 static 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 
330 static 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 
341 static 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 
380 static 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                 /* set VBAT threshold for critical */
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                 /* notify the system of battery critical */
396                 if (charger->battery_critical)
397                         charger->battery_critical();
398         }
399 }
400 
401 static 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 
424 static 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 
448 static 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 
462 static 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          * Enable reference voltage supply for ADC from the LDO_INTERNAL
478          * regulator. Must be set before ADC measurements can be made.
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         /* enable auto ADC measuremnts */
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 
494 static 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         /* 10 seconds between monitor runs unless platform defines other
516            interval */
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 
557 err_ps_register:
558         da903x_unregister_notifier(charger->master, &charger->nb,
559                                    DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
560                                    DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
561 err_notifier:
562         cancel_delayed_work(&charger->work);
563 
564 err_charger_init:
565         return ret;
566 }
567 
568 static 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 
584 static 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 
592 module_platform_driver(da903x_battery_driver);
593 
594 MODULE_DESCRIPTION("DA9030 battery charger driver");
595 MODULE_AUTHOR("Mike Rapoport, CompuLab");
596 MODULE_LICENSE("GPL");
597 

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