Root/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
26#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);
246
247    power_supply_changed(&charger->psy);
248}
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 {
262        /* Charger has been pulled out */
263        if (!charger->chdet) {
264            da9030_set_charge(charger, 0);
265            return;
266        }
267
268        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);
405
406    switch (event) {
407    case DA9030_EVENT_CHDET:
408        cancel_delayed_work_sync(&charger->work);
409        schedule_work(&charger->work.work);
410        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
513    /* 10 seconds between monitor runs unless platform defines other
514       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);
573    cancel_delayed_work_sync(&charger->work);
574    da9030_set_charge(charger, 0);
575    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
591module_platform_driver(da903x_battery_driver);
592
593MODULE_DESCRIPTION("DA9030 battery charger driver");
594MODULE_AUTHOR("Mike Rapoport, CompuLab");
595MODULE_LICENSE("GPL");
596

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