Merge remote-tracking branch 'mkp-scsi/4.7/scsi-fixes' into fixes
[linux-2.6-block.git] / drivers / power / max8925_power.c
1 /*
2  * Battery driver for Maxim MAX8925
3  *
4  * Copyright (c) 2009-2010 Marvell International Ltd.
5  *      Haojian Zhuang <haojian.zhuang@marvell.com>
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/module.h>
13 #include <linux/err.h>
14 #include <linux/slab.h>
15 #include <linux/of.h>
16 #include <linux/i2c.h>
17 #include <linux/interrupt.h>
18 #include <linux/platform_device.h>
19 #include <linux/power_supply.h>
20 #include <linux/mfd/max8925.h>
21
22 /* registers in GPM */
23 #define MAX8925_OUT5VEN                 0x54
24 #define MAX8925_OUT3VEN                 0x58
25 #define MAX8925_CHG_CNTL1               0x7c
26
27 /* bits definition */
28 #define MAX8925_CHG_STAT_VSYSLOW        (1 << 0)
29 #define MAX8925_CHG_STAT_MODE_MASK      (3 << 2)
30 #define MAX8925_CHG_STAT_EN_MASK        (1 << 4)
31 #define MAX8925_CHG_MBDET               (1 << 1)
32 #define MAX8925_CHG_AC_RANGE_MASK       (3 << 6)
33
34 /* registers in ADC */
35 #define MAX8925_ADC_RES_CNFG1           0x06
36 #define MAX8925_ADC_AVG_CNFG1           0x07
37 #define MAX8925_ADC_ACQ_CNFG1           0x08
38 #define MAX8925_ADC_ACQ_CNFG2           0x09
39 /* 2 bytes registers in below. MSB is 1st, LSB is 2nd. */
40 #define MAX8925_ADC_AUX2                0x62
41 #define MAX8925_ADC_VCHG                0x64
42 #define MAX8925_ADC_VBBATT              0x66
43 #define MAX8925_ADC_VMBATT              0x68
44 #define MAX8925_ADC_ISNS                0x6a
45 #define MAX8925_ADC_THM                 0x6c
46 #define MAX8925_ADC_TDIE                0x6e
47 #define MAX8925_CMD_AUX2                0xc8
48 #define MAX8925_CMD_VCHG                0xd0
49 #define MAX8925_CMD_VBBATT              0xd8
50 #define MAX8925_CMD_VMBATT              0xe0
51 #define MAX8925_CMD_ISNS                0xe8
52 #define MAX8925_CMD_THM                 0xf0
53 #define MAX8925_CMD_TDIE                0xf8
54
55 enum {
56         MEASURE_AUX2,
57         MEASURE_VCHG,
58         MEASURE_VBBATT,
59         MEASURE_VMBATT,
60         MEASURE_ISNS,
61         MEASURE_THM,
62         MEASURE_TDIE,
63         MEASURE_MAX,
64 };
65
66 struct max8925_power_info {
67         struct max8925_chip     *chip;
68         struct i2c_client       *gpm;
69         struct i2c_client       *adc;
70
71         struct power_supply     *ac;
72         struct power_supply     *usb;
73         struct power_supply     *battery;
74         int                     irq_base;
75         unsigned                ac_online:1;
76         unsigned                usb_online:1;
77         unsigned                bat_online:1;
78         unsigned                chg_mode:2;
79         unsigned                batt_detect:1;  /* detecing MB by ID pin */
80         unsigned                topoff_threshold:2;
81         unsigned                fast_charge:3;
82         unsigned                no_temp_support:1;
83         unsigned                no_insert_detect:1;
84
85         int (*set_charger) (int);
86 };
87
88 static int __set_charger(struct max8925_power_info *info, int enable)
89 {
90         struct max8925_chip *chip = info->chip;
91         if (enable) {
92                 /* enable charger in platform */
93                 if (info->set_charger)
94                         info->set_charger(1);
95                 /* enable charger */
96                 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 0);
97         } else {
98                 /* disable charge */
99                 max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
100                 if (info->set_charger)
101                         info->set_charger(0);
102         }
103         dev_dbg(chip->dev, "%s\n", (enable) ? "Enable charger"
104                 : "Disable charger");
105         return 0;
106 }
107
108 static irqreturn_t max8925_charger_handler(int irq, void *data)
109 {
110         struct max8925_power_info *info = (struct max8925_power_info *)data;
111         struct max8925_chip *chip = info->chip;
112
113         switch (irq - chip->irq_base) {
114         case MAX8925_IRQ_VCHG_DC_R:
115                 info->ac_online = 1;
116                 __set_charger(info, 1);
117                 dev_dbg(chip->dev, "Adapter inserted\n");
118                 break;
119         case MAX8925_IRQ_VCHG_DC_F:
120                 info->ac_online = 0;
121                 __set_charger(info, 0);
122                 dev_dbg(chip->dev, "Adapter removed\n");
123                 break;
124         case MAX8925_IRQ_VCHG_THM_OK_F:
125                 /* Battery is not ready yet */
126                 dev_dbg(chip->dev, "Battery temperature is out of range\n");
127         case MAX8925_IRQ_VCHG_DC_OVP:
128                 dev_dbg(chip->dev, "Error detection\n");
129                 __set_charger(info, 0);
130                 break;
131         case MAX8925_IRQ_VCHG_THM_OK_R:
132                 /* Battery is ready now */
133                 dev_dbg(chip->dev, "Battery temperature is in range\n");
134                 break;
135         case MAX8925_IRQ_VCHG_SYSLOW_R:
136                 /* VSYS is low */
137                 dev_info(chip->dev, "Sys power is too low\n");
138                 break;
139         case MAX8925_IRQ_VCHG_SYSLOW_F:
140                 dev_dbg(chip->dev, "Sys power is above low threshold\n");
141                 break;
142         case MAX8925_IRQ_VCHG_DONE:
143                 __set_charger(info, 0);
144                 dev_dbg(chip->dev, "Charging is done\n");
145                 break;
146         case MAX8925_IRQ_VCHG_TOPOFF:
147                 dev_dbg(chip->dev, "Charging in top-off mode\n");
148                 break;
149         case MAX8925_IRQ_VCHG_TMR_FAULT:
150                 __set_charger(info, 0);
151                 dev_dbg(chip->dev, "Safe timer is expired\n");
152                 break;
153         case MAX8925_IRQ_VCHG_RST:
154                 __set_charger(info, 0);
155                 dev_dbg(chip->dev, "Charger is reset\n");
156                 break;
157         }
158         return IRQ_HANDLED;
159 }
160
161 static int start_measure(struct max8925_power_info *info, int type)
162 {
163         unsigned char buf[2] = {0, 0};
164         int meas_cmd;
165         int meas_reg = 0, ret;
166
167         switch (type) {
168         case MEASURE_VCHG:
169                 meas_cmd = MAX8925_CMD_VCHG;
170                 meas_reg = MAX8925_ADC_VCHG;
171                 break;
172         case MEASURE_VBBATT:
173                 meas_cmd = MAX8925_CMD_VBBATT;
174                 meas_reg = MAX8925_ADC_VBBATT;
175                 break;
176         case MEASURE_VMBATT:
177                 meas_cmd = MAX8925_CMD_VMBATT;
178                 meas_reg = MAX8925_ADC_VMBATT;
179                 break;
180         case MEASURE_ISNS:
181                 meas_cmd = MAX8925_CMD_ISNS;
182                 meas_reg = MAX8925_ADC_ISNS;
183                 break;
184         default:
185                 return -EINVAL;
186         }
187
188         max8925_reg_write(info->adc, meas_cmd, 0);
189         max8925_bulk_read(info->adc, meas_reg, 2, buf);
190         ret = ((buf[0]<<8) | buf[1]) >> 4;
191
192         return ret;
193 }
194
195 static int max8925_ac_get_prop(struct power_supply *psy,
196                                enum power_supply_property psp,
197                                union power_supply_propval *val)
198 {
199         struct max8925_power_info *info = dev_get_drvdata(psy->dev.parent);
200         int ret = 0;
201
202         switch (psp) {
203         case POWER_SUPPLY_PROP_ONLINE:
204                 val->intval = info->ac_online;
205                 break;
206         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
207                 if (info->ac_online) {
208                         ret = start_measure(info, MEASURE_VCHG);
209                         if (ret >= 0) {
210                                 val->intval = ret * 2000;       /* unit is uV */
211                                 goto out;
212                         }
213                 }
214                 ret = -ENODATA;
215                 break;
216         default:
217                 ret = -ENODEV;
218                 break;
219         }
220 out:
221         return ret;
222 }
223
224 static enum power_supply_property max8925_ac_props[] = {
225         POWER_SUPPLY_PROP_ONLINE,
226         POWER_SUPPLY_PROP_VOLTAGE_NOW,
227 };
228
229 static int max8925_usb_get_prop(struct power_supply *psy,
230                                 enum power_supply_property psp,
231                                 union power_supply_propval *val)
232 {
233         struct max8925_power_info *info = dev_get_drvdata(psy->dev.parent);
234         int ret = 0;
235
236         switch (psp) {
237         case POWER_SUPPLY_PROP_ONLINE:
238                 val->intval = info->usb_online;
239                 break;
240         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
241                 if (info->usb_online) {
242                         ret = start_measure(info, MEASURE_VCHG);
243                         if (ret >= 0) {
244                                 val->intval = ret * 2000;       /* unit is uV */
245                                 goto out;
246                         }
247                 }
248                 ret = -ENODATA;
249                 break;
250         default:
251                 ret = -ENODEV;
252                 break;
253         }
254 out:
255         return ret;
256 }
257
258 static enum power_supply_property max8925_usb_props[] = {
259         POWER_SUPPLY_PROP_ONLINE,
260         POWER_SUPPLY_PROP_VOLTAGE_NOW,
261 };
262
263 static int max8925_bat_get_prop(struct power_supply *psy,
264                                 enum power_supply_property psp,
265                                 union power_supply_propval *val)
266 {
267         struct max8925_power_info *info = dev_get_drvdata(psy->dev.parent);
268         int ret = 0;
269
270         switch (psp) {
271         case POWER_SUPPLY_PROP_ONLINE:
272                 val->intval = info->bat_online;
273                 break;
274         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
275                 if (info->bat_online) {
276                         ret = start_measure(info, MEASURE_VMBATT);
277                         if (ret >= 0) {
278                                 val->intval = ret * 2000;       /* unit is uV */
279                                 ret = 0;
280                                 break;
281                         }
282                 }
283                 ret = -ENODATA;
284                 break;
285         case POWER_SUPPLY_PROP_CURRENT_NOW:
286                 if (info->bat_online) {
287                         ret = start_measure(info, MEASURE_ISNS);
288                         if (ret >= 0) {
289                                 /* assume r_sns is 0.02 */
290                                 ret = ((ret * 6250) - 3125) /* uA */;
291                                 val->intval = 0;
292                                 if (ret > 0)
293                                         val->intval = ret; /* unit is mA */
294                                 ret = 0;
295                                 break;
296                         }
297                 }
298                 ret = -ENODATA;
299                 break;
300         case POWER_SUPPLY_PROP_CHARGE_TYPE:
301                 if (!info->bat_online) {
302                         ret = -ENODATA;
303                         break;
304                 }
305                 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
306                 ret = (ret & MAX8925_CHG_STAT_MODE_MASK) >> 2;
307                 switch (ret) {
308                 case 1:
309                         val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
310                         break;
311                 case 0:
312                 case 2:
313                         val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
314                         break;
315                 case 3:
316                         val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
317                         break;
318                 }
319                 ret = 0;
320                 break;
321         case POWER_SUPPLY_PROP_STATUS:
322                 if (!info->bat_online) {
323                         ret = -ENODATA;
324                         break;
325                 }
326                 ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
327                 if (info->usb_online || info->ac_online) {
328                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
329                         if (ret & MAX8925_CHG_STAT_EN_MASK)
330                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
331                 } else
332                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
333                 ret = 0;
334                 break;
335         default:
336                 ret = -ENODEV;
337                 break;
338         }
339         return ret;
340 }
341
342 static enum power_supply_property max8925_battery_props[] = {
343         POWER_SUPPLY_PROP_ONLINE,
344         POWER_SUPPLY_PROP_VOLTAGE_NOW,
345         POWER_SUPPLY_PROP_CURRENT_NOW,
346         POWER_SUPPLY_PROP_CHARGE_TYPE,
347         POWER_SUPPLY_PROP_STATUS,
348 };
349
350 static const struct power_supply_desc ac_desc = {
351         .name           = "max8925-ac",
352         .type           = POWER_SUPPLY_TYPE_MAINS,
353         .properties     = max8925_ac_props,
354         .num_properties = ARRAY_SIZE(max8925_ac_props),
355         .get_property   = max8925_ac_get_prop,
356 };
357
358 static const struct power_supply_desc usb_desc = {
359         .name           = "max8925-usb",
360         .type           = POWER_SUPPLY_TYPE_USB,
361         .properties     = max8925_usb_props,
362         .num_properties = ARRAY_SIZE(max8925_usb_props),
363         .get_property   = max8925_usb_get_prop,
364 };
365
366 static const struct power_supply_desc battery_desc = {
367         .name           = "max8925-battery",
368         .type           = POWER_SUPPLY_TYPE_BATTERY,
369         .properties     = max8925_battery_props,
370         .num_properties = ARRAY_SIZE(max8925_battery_props),
371         .get_property   = max8925_bat_get_prop,
372 };
373
374 #define REQUEST_IRQ(_irq, _name)                                        \
375 do {                                                                    \
376         ret = request_threaded_irq(chip->irq_base + _irq, NULL,         \
377                                     max8925_charger_handler,            \
378                                     IRQF_ONESHOT, _name, info);         \
379         if (ret)                                                        \
380                 dev_err(chip->dev, "Failed to request IRQ #%d: %d\n",   \
381                         _irq, ret);                                     \
382 } while (0)
383
384 static int max8925_init_charger(struct max8925_chip *chip,
385                                           struct max8925_power_info *info)
386 {
387         int ret;
388
389         REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp");
390         if (!info->no_insert_detect) {
391                 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove");
392                 REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert");
393         }
394         if (!info->no_temp_support) {
395                 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R, "batt-temp-in-range");
396                 REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F, "batt-temp-out-range");
397         }
398         REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F, "vsys-high");
399         REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R, "vsys-low");
400         REQUEST_IRQ(MAX8925_IRQ_VCHG_RST, "charger-reset");
401         REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE, "charger-done");
402         REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff");
403         REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire");
404
405         info->usb_online = 0;
406         info->bat_online = 0;
407
408         /* check for power - can miss interrupt at boot time */
409         if (start_measure(info, MEASURE_VCHG) * 2000 > 500000)
410                 info->ac_online = 1;
411         else
412                 info->ac_online = 0;
413
414         ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
415         if (ret >= 0) {
416                 /*
417                  * If battery detection is enabled, ID pin of battery is
418                  * connected to MBDET pin of MAX8925. It could be used to
419                  * detect battery presence.
420                  * Otherwise, we have to assume that battery is always on.
421                  */
422                 if (info->batt_detect)
423                         info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1;
424                 else
425                         info->bat_online = 1;
426                 if (ret & MAX8925_CHG_AC_RANGE_MASK)
427                         info->ac_online = 1;
428                 else
429                         info->ac_online = 0;
430         }
431         /* disable charge */
432         max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
433         /* set charging current in charge topoff mode */
434         max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 3 << 5,
435                          info->topoff_threshold << 5);
436         /* set charing current in fast charge mode */
437         max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 7, info->fast_charge);
438
439         return 0;
440 }
441
442 static int max8925_deinit_charger(struct max8925_power_info *info)
443 {
444         struct max8925_chip *chip = info->chip;
445         int irq;
446
447         irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP;
448         for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++)
449                 free_irq(irq, info);
450
451         return 0;
452 }
453
454 #ifdef CONFIG_OF
455 static struct max8925_power_pdata *
456 max8925_power_dt_init(struct platform_device *pdev)
457 {
458         struct device_node *nproot = pdev->dev.parent->of_node;
459         struct device_node *np;
460         int batt_detect;
461         int topoff_threshold;
462         int fast_charge;
463         int no_temp_support;
464         int no_insert_detect;
465         struct max8925_power_pdata *pdata;
466
467         if (!nproot)
468                 return pdev->dev.platform_data;
469
470         np = of_get_child_by_name(nproot, "charger");
471         if (!np) {
472                 dev_err(&pdev->dev, "failed to find charger node\n");
473                 return NULL;
474         }
475
476         pdata = devm_kzalloc(&pdev->dev,
477                         sizeof(struct max8925_power_pdata),
478                         GFP_KERNEL);
479         if (!pdata)
480                 goto ret;
481
482         of_property_read_u32(np, "topoff-threshold", &topoff_threshold);
483         of_property_read_u32(np, "batt-detect", &batt_detect);
484         of_property_read_u32(np, "fast-charge", &fast_charge);
485         of_property_read_u32(np, "no-insert-detect", &no_insert_detect);
486         of_property_read_u32(np, "no-temp-support", &no_temp_support);
487
488         pdata->batt_detect = batt_detect;
489         pdata->fast_charge = fast_charge;
490         pdata->topoff_threshold = topoff_threshold;
491         pdata->no_insert_detect = no_insert_detect;
492         pdata->no_temp_support = no_temp_support;
493
494 ret:
495         of_node_put(np);
496         return pdata;
497 }
498 #else
499 static struct max8925_power_pdata *
500 max8925_power_dt_init(struct platform_device *pdev)
501 {
502         return pdev->dev.platform_data;
503 }
504 #endif
505
506 static int max8925_power_probe(struct platform_device *pdev)
507 {
508         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
509         struct power_supply_config psy_cfg = {}; /* Only for ac and usb */
510         struct max8925_power_pdata *pdata = NULL;
511         struct max8925_power_info *info;
512         int ret;
513
514         pdata = max8925_power_dt_init(pdev);
515         if (!pdata) {
516                 dev_err(&pdev->dev, "platform data isn't assigned to "
517                         "power supply\n");
518                 return -EINVAL;
519         }
520
521         info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_power_info),
522                                 GFP_KERNEL);
523         if (!info)
524                 return -ENOMEM;
525         info->chip = chip;
526         info->gpm = chip->i2c;
527         info->adc = chip->adc;
528         platform_set_drvdata(pdev, info);
529
530         psy_cfg.supplied_to = pdata->supplied_to;
531         psy_cfg.num_supplicants = pdata->num_supplicants;
532
533         info->ac = power_supply_register(&pdev->dev, &ac_desc, &psy_cfg);
534         if (IS_ERR(info->ac)) {
535                 ret = PTR_ERR(info->ac);
536                 goto out;
537         }
538         info->ac->dev.parent = &pdev->dev;
539
540         info->usb = power_supply_register(&pdev->dev, &usb_desc, &psy_cfg);
541         if (IS_ERR(info->usb)) {
542                 ret = PTR_ERR(info->usb);
543                 goto out_unregister_ac;
544         }
545         info->usb->dev.parent = &pdev->dev;
546
547         info->battery = power_supply_register(&pdev->dev, &battery_desc, NULL);
548         if (IS_ERR(info->battery)) {
549                 ret = PTR_ERR(info->battery);
550                 goto out_unregister_usb;
551         }
552         info->battery->dev.parent = &pdev->dev;
553
554         info->batt_detect = pdata->batt_detect;
555         info->topoff_threshold = pdata->topoff_threshold;
556         info->fast_charge = pdata->fast_charge;
557         info->set_charger = pdata->set_charger;
558         info->no_temp_support = pdata->no_temp_support;
559         info->no_insert_detect = pdata->no_insert_detect;
560
561         max8925_init_charger(chip, info);
562         return 0;
563 out_unregister_usb:
564         power_supply_unregister(info->usb);
565 out_unregister_ac:
566         power_supply_unregister(info->ac);
567 out:
568         return ret;
569 }
570
571 static int max8925_power_remove(struct platform_device *pdev)
572 {
573         struct max8925_power_info *info = platform_get_drvdata(pdev);
574
575         if (info) {
576                 power_supply_unregister(info->ac);
577                 power_supply_unregister(info->usb);
578                 power_supply_unregister(info->battery);
579                 max8925_deinit_charger(info);
580         }
581         return 0;
582 }
583
584 static struct platform_driver max8925_power_driver = {
585         .probe  = max8925_power_probe,
586         .remove = max8925_power_remove,
587         .driver = {
588                 .name   = "max8925-power",
589         },
590 };
591
592 module_platform_driver(max8925_power_driver);
593
594 MODULE_LICENSE("GPL");
595 MODULE_DESCRIPTION("Power supply driver for MAX8925");
596 MODULE_ALIAS("platform:max8925-power");