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1 /*
2  * max8997.c - Regulator driver for the Maxim 8997/8966
3  *
4  * Copyright (C) 2011 Samsung Electronics
5  * MyungJoo Ham <myungjoo.ham@smasung.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 as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20  *
21  * This driver is based on max8998.c
22  */
23
24 #include <linux/bug.h>
25 #include <linux/err.h>
26 #include <linux/gpio.h>
27 #include <linux/of_gpio.h>
28 #include <linux/slab.h>
29 #include <linux/module.h>
30 #include <linux/platform_device.h>
31 #include <linux/regulator/driver.h>
32 #include <linux/regulator/machine.h>
33 #include <linux/mfd/max8997.h>
34 #include <linux/mfd/max8997-private.h>
35 #include <linux/regulator/of_regulator.h>
36
37 struct max8997_data {
38         struct device *dev;
39         struct max8997_dev *iodev;
40         int num_regulators;
41         struct regulator_dev **rdev;
42         int ramp_delay; /* in mV/us */
43
44         bool buck1_gpiodvs;
45         bool buck2_gpiodvs;
46         bool buck5_gpiodvs;
47         u8 buck1_vol[8];
48         u8 buck2_vol[8];
49         u8 buck5_vol[8];
50         int buck125_gpios[3];
51         int buck125_gpioindex;
52         bool ignore_gpiodvs_side_effect;
53
54         u8 saved_states[MAX8997_REG_MAX];
55 };
56
57 static inline void max8997_set_gpio(struct max8997_data *max8997)
58 {
59         int set3 = (max8997->buck125_gpioindex) & 0x1;
60         int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
61         int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;
62
63         gpio_set_value(max8997->buck125_gpios[0], set1);
64         gpio_set_value(max8997->buck125_gpios[1], set2);
65         gpio_set_value(max8997->buck125_gpios[2], set3);
66 }
67
68 struct voltage_map_desc {
69         int min;
70         int max;
71         int step;
72 };
73
74 /* Voltage maps in uV */
75 static const struct voltage_map_desc ldo_voltage_map_desc = {
76         .min = 800000,  .max = 3950000, .step = 50000,
77 }; /* LDO1 ~ 18, 21 all */
78
79 static const struct voltage_map_desc buck1245_voltage_map_desc = {
80         .min = 650000,  .max = 2225000, .step = 25000,
81 }; /* Buck1, 2, 4, 5 */
82
83 static const struct voltage_map_desc buck37_voltage_map_desc = {
84         .min = 750000,  .max = 3900000, .step = 50000,
85 }; /* Buck3, 7 */
86
87 /* current map in uA */
88 static const struct voltage_map_desc charger_current_map_desc = {
89         .min = 200000,  .max = 950000,  .step = 50000,
90 };
91
92 static const struct voltage_map_desc topoff_current_map_desc = {
93         .min = 50000,   .max = 200000,  .step = 10000,
94 };
95
96 static const struct voltage_map_desc *reg_voltage_map[] = {
97         [MAX8997_LDO1] = &ldo_voltage_map_desc,
98         [MAX8997_LDO2] = &ldo_voltage_map_desc,
99         [MAX8997_LDO3] = &ldo_voltage_map_desc,
100         [MAX8997_LDO4] = &ldo_voltage_map_desc,
101         [MAX8997_LDO5] = &ldo_voltage_map_desc,
102         [MAX8997_LDO6] = &ldo_voltage_map_desc,
103         [MAX8997_LDO7] = &ldo_voltage_map_desc,
104         [MAX8997_LDO8] = &ldo_voltage_map_desc,
105         [MAX8997_LDO9] = &ldo_voltage_map_desc,
106         [MAX8997_LDO10] = &ldo_voltage_map_desc,
107         [MAX8997_LDO11] = &ldo_voltage_map_desc,
108         [MAX8997_LDO12] = &ldo_voltage_map_desc,
109         [MAX8997_LDO13] = &ldo_voltage_map_desc,
110         [MAX8997_LDO14] = &ldo_voltage_map_desc,
111         [MAX8997_LDO15] = &ldo_voltage_map_desc,
112         [MAX8997_LDO16] = &ldo_voltage_map_desc,
113         [MAX8997_LDO17] = &ldo_voltage_map_desc,
114         [MAX8997_LDO18] = &ldo_voltage_map_desc,
115         [MAX8997_LDO21] = &ldo_voltage_map_desc,
116         [MAX8997_BUCK1] = &buck1245_voltage_map_desc,
117         [MAX8997_BUCK2] = &buck1245_voltage_map_desc,
118         [MAX8997_BUCK3] = &buck37_voltage_map_desc,
119         [MAX8997_BUCK4] = &buck1245_voltage_map_desc,
120         [MAX8997_BUCK5] = &buck1245_voltage_map_desc,
121         [MAX8997_BUCK6] = NULL,
122         [MAX8997_BUCK7] = &buck37_voltage_map_desc,
123         [MAX8997_EN32KHZ_AP] = NULL,
124         [MAX8997_EN32KHZ_CP] = NULL,
125         [MAX8997_ENVICHG] = NULL,
126         [MAX8997_ESAFEOUT1] = NULL,
127         [MAX8997_ESAFEOUT2] = NULL,
128         [MAX8997_CHARGER_CV] = NULL,
129         [MAX8997_CHARGER] = &charger_current_map_desc,
130         [MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc,
131 };
132
133 static int max8997_list_voltage_safeout(struct regulator_dev *rdev,
134                 unsigned int selector)
135 {
136         int rid = rdev_get_id(rdev);
137
138         if (rid == MAX8997_ESAFEOUT1 || rid == MAX8997_ESAFEOUT2) {
139                 switch (selector) {
140                 case 0:
141                         return 4850000;
142                 case 1:
143                         return 4900000;
144                 case 2:
145                         return 4950000;
146                 case 3:
147                         return 3300000;
148                 default:
149                         return -EINVAL;
150                 }
151         }
152
153         return -EINVAL;
154 }
155
156 static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev,
157                 unsigned int selector)
158 {
159         int rid = rdev_get_id(rdev);
160
161         if (rid != MAX8997_CHARGER_CV)
162                 goto err;
163
164         switch (selector) {
165         case 0x00:
166                 return 4200000;
167         case 0x01 ... 0x0E:
168                 return 4000000 + 20000 * (selector - 0x01);
169         case 0x0F:
170                 return 4350000;
171         default:
172                 return -EINVAL;
173         }
174 err:
175         return -EINVAL;
176 }
177
178 static int max8997_list_voltage(struct regulator_dev *rdev,
179                 unsigned int selector)
180 {
181         const struct voltage_map_desc *desc;
182         int rid = rdev_get_id(rdev);
183         int val;
184
185         if (rid >= ARRAY_SIZE(reg_voltage_map) ||
186                         rid < 0)
187                 return -EINVAL;
188
189         desc = reg_voltage_map[rid];
190         if (desc == NULL)
191                 return -EINVAL;
192
193         val = desc->min + desc->step * selector;
194         if (val > desc->max)
195                 return -EINVAL;
196
197         return val;
198 }
199
200 static int max8997_get_enable_register(struct regulator_dev *rdev,
201                 int *reg, int *mask, int *pattern)
202 {
203         int rid = rdev_get_id(rdev);
204
205         switch (rid) {
206         case MAX8997_LDO1 ... MAX8997_LDO21:
207                 *reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
208                 *mask = 0xC0;
209                 *pattern = 0xC0;
210                 break;
211         case MAX8997_BUCK1:
212                 *reg = MAX8997_REG_BUCK1CTRL;
213                 *mask = 0x01;
214                 *pattern = 0x01;
215                 break;
216         case MAX8997_BUCK2:
217                 *reg = MAX8997_REG_BUCK2CTRL;
218                 *mask = 0x01;
219                 *pattern = 0x01;
220                 break;
221         case MAX8997_BUCK3:
222                 *reg = MAX8997_REG_BUCK3CTRL;
223                 *mask = 0x01;
224                 *pattern = 0x01;
225                 break;
226         case MAX8997_BUCK4:
227                 *reg = MAX8997_REG_BUCK4CTRL;
228                 *mask = 0x01;
229                 *pattern = 0x01;
230                 break;
231         case MAX8997_BUCK5:
232                 *reg = MAX8997_REG_BUCK5CTRL;
233                 *mask = 0x01;
234                 *pattern = 0x01;
235                 break;
236         case MAX8997_BUCK6:
237                 *reg = MAX8997_REG_BUCK6CTRL;
238                 *mask = 0x01;
239                 *pattern = 0x01;
240                 break;
241         case MAX8997_BUCK7:
242                 *reg = MAX8997_REG_BUCK7CTRL;
243                 *mask = 0x01;
244                 *pattern = 0x01;
245                 break;
246         case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP:
247                 *reg = MAX8997_REG_MAINCON1;
248                 *mask = 0x01 << (rid - MAX8997_EN32KHZ_AP);
249                 *pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP);
250                 break;
251         case MAX8997_ENVICHG:
252                 *reg = MAX8997_REG_MBCCTRL1;
253                 *mask = 0x80;
254                 *pattern = 0x80;
255                 break;
256         case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
257                 *reg = MAX8997_REG_SAFEOUTCTRL;
258                 *mask = 0x40 << (rid - MAX8997_ESAFEOUT1);
259                 *pattern = 0x40 << (rid - MAX8997_ESAFEOUT1);
260                 break;
261         case MAX8997_CHARGER:
262                 *reg = MAX8997_REG_MBCCTRL2;
263                 *mask = 0x40;
264                 *pattern = 0x40;
265                 break;
266         default:
267                 /* Not controllable or not exists */
268                 return -EINVAL;
269         }
270
271         return 0;
272 }
273
274 static int max8997_reg_is_enabled(struct regulator_dev *rdev)
275 {
276         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
277         struct i2c_client *i2c = max8997->iodev->i2c;
278         int ret, reg, mask, pattern;
279         u8 val;
280
281         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
282         if (ret)
283                 return ret;
284
285         ret = max8997_read_reg(i2c, reg, &val);
286         if (ret)
287                 return ret;
288
289         return (val & mask) == pattern;
290 }
291
292 static int max8997_reg_enable(struct regulator_dev *rdev)
293 {
294         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
295         struct i2c_client *i2c = max8997->iodev->i2c;
296         int ret, reg, mask, pattern;
297
298         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
299         if (ret)
300                 return ret;
301
302         return max8997_update_reg(i2c, reg, pattern, mask);
303 }
304
305 static int max8997_reg_disable(struct regulator_dev *rdev)
306 {
307         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
308         struct i2c_client *i2c = max8997->iodev->i2c;
309         int ret, reg, mask, pattern;
310
311         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
312         if (ret)
313                 return ret;
314
315         return max8997_update_reg(i2c, reg, ~pattern, mask);
316 }
317
318 static int max8997_get_voltage_register(struct regulator_dev *rdev,
319                 int *_reg, int *_shift, int *_mask)
320 {
321         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
322         int rid = rdev_get_id(rdev);
323         int reg, shift = 0, mask = 0x3f;
324
325         switch (rid) {
326         case MAX8997_LDO1 ... MAX8997_LDO21:
327                 reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
328                 break;
329         case MAX8997_BUCK1:
330                 reg = MAX8997_REG_BUCK1DVS1;
331                 if (max8997->buck1_gpiodvs)
332                         reg += max8997->buck125_gpioindex;
333                 break;
334         case MAX8997_BUCK2:
335                 reg = MAX8997_REG_BUCK2DVS1;
336                 if (max8997->buck2_gpiodvs)
337                         reg += max8997->buck125_gpioindex;
338                 break;
339         case MAX8997_BUCK3:
340                 reg = MAX8997_REG_BUCK3DVS;
341                 break;
342         case MAX8997_BUCK4:
343                 reg = MAX8997_REG_BUCK4DVS;
344                 break;
345         case MAX8997_BUCK5:
346                 reg = MAX8997_REG_BUCK5DVS1;
347                 if (max8997->buck5_gpiodvs)
348                         reg += max8997->buck125_gpioindex;
349                 break;
350         case MAX8997_BUCK7:
351                 reg = MAX8997_REG_BUCK7DVS;
352                 break;
353         case MAX8997_ESAFEOUT1 ...  MAX8997_ESAFEOUT2:
354                 reg = MAX8997_REG_SAFEOUTCTRL;
355                 shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0;
356                 mask = 0x3;
357                 break;
358         case MAX8997_CHARGER_CV:
359                 reg = MAX8997_REG_MBCCTRL3;
360                 shift = 0;
361                 mask = 0xf;
362                 break;
363         case MAX8997_CHARGER:
364                 reg = MAX8997_REG_MBCCTRL4;
365                 shift = 0;
366                 mask = 0xf;
367                 break;
368         case MAX8997_CHARGER_TOPOFF:
369                 reg = MAX8997_REG_MBCCTRL5;
370                 shift = 0;
371                 mask = 0xf;
372                 break;
373         default:
374                 return -EINVAL;
375         }
376
377         *_reg = reg;
378         *_shift = shift;
379         *_mask = mask;
380
381         return 0;
382 }
383
384 static int max8997_get_voltage_sel(struct regulator_dev *rdev)
385 {
386         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
387         struct i2c_client *i2c = max8997->iodev->i2c;
388         int reg, shift, mask, ret;
389         u8 val;
390
391         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
392         if (ret)
393                 return ret;
394
395         ret = max8997_read_reg(i2c, reg, &val);
396         if (ret)
397                 return ret;
398
399         val >>= shift;
400         val &= mask;
401
402         return val;
403 }
404
405 static inline int max8997_get_voltage_proper_val(
406                 const struct voltage_map_desc *desc,
407                 int min_vol, int max_vol)
408 {
409         int i;
410
411         if (desc == NULL)
412                 return -EINVAL;
413
414         if (max_vol < desc->min || min_vol > desc->max)
415                 return -EINVAL;
416
417         if (min_vol < desc->min)
418                 min_vol = desc->min;
419
420         i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
421
422         if (desc->min + desc->step * i > max_vol)
423                 return -EINVAL;
424
425         return i;
426 }
427
428 static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev,
429                 int min_uV, int max_uV, unsigned *selector)
430 {
431         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
432         struct i2c_client *i2c = max8997->iodev->i2c;
433         int rid = rdev_get_id(rdev);
434         int lb, ub;
435         int reg, shift = 0, mask, ret = 0;
436         u8 val = 0x0;
437
438         if (rid != MAX8997_CHARGER_CV)
439                 return -EINVAL;
440
441         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
442         if (ret)
443                 return ret;
444
445         if (max_uV < 4000000 || min_uV > 4350000)
446                 return -EINVAL;
447
448         if (min_uV <= 4000000) {
449                 if (max_uV >= 4000000)
450                         return -EINVAL;
451                 else
452                         val = 0x1;
453         } else if (min_uV <= 4200000 && max_uV >= 4200000)
454                 val = 0x0;
455         else {
456                 lb = (min_uV - 4000001) / 20000 + 2;
457                 ub = (max_uV - 4000000) / 20000 + 1;
458
459                 if (lb > ub)
460                         return -EINVAL;
461
462                 if (lb < 0xf)
463                         val = lb;
464                 else {
465                         if (ub >= 0xf)
466                                 val = 0xf;
467                         else
468                                 return -EINVAL;
469                 }
470         }
471
472         *selector = val;
473
474         ret = max8997_update_reg(i2c, reg, val << shift, mask);
475
476         return ret;
477 }
478
479 /*
480  * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
481  * BUCK1, 2, and 5 are available if they are not controlled by gpio
482  */
483 static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
484                 int min_uV, int max_uV, unsigned *selector)
485 {
486         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
487         struct i2c_client *i2c = max8997->iodev->i2c;
488         const struct voltage_map_desc *desc;
489         int rid = rdev_get_id(rdev);
490         int i, reg, shift, mask, ret;
491
492         switch (rid) {
493         case MAX8997_LDO1 ... MAX8997_LDO21:
494                 break;
495         case MAX8997_BUCK1 ... MAX8997_BUCK5:
496                 break;
497         case MAX8997_BUCK6:
498                 return -EINVAL;
499         case MAX8997_BUCK7:
500                 break;
501         case MAX8997_CHARGER:
502                 break;
503         case MAX8997_CHARGER_TOPOFF:
504                 break;
505         default:
506                 return -EINVAL;
507         }
508
509         desc = reg_voltage_map[rid];
510
511         i = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
512         if (i < 0)
513                 return i;
514
515         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
516         if (ret)
517                 return ret;
518
519         ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
520         *selector = i;
521
522         return ret;
523 }
524
525 static int max8997_set_voltage_ldobuck_time_sel(struct regulator_dev *rdev,
526                                                 unsigned int old_selector,
527                                                 unsigned int new_selector)
528 {
529         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
530         int rid = rdev_get_id(rdev);
531         const struct voltage_map_desc *desc = reg_voltage_map[rid];
532
533         /* Delay is required only if the voltage is increasing */
534         if (old_selector >= new_selector)
535                 return 0;
536
537         /* No need to delay if gpio_dvs_mode */
538         switch (rid) {
539         case MAX8997_BUCK1:
540                 if (max8997->buck1_gpiodvs)
541                         return 0;
542                 break;
543         case MAX8997_BUCK2:
544                 if (max8997->buck2_gpiodvs)
545                         return 0;
546                 break;
547         case MAX8997_BUCK5:
548                 if (max8997->buck5_gpiodvs)
549                         return 0;
550                 break;
551         }
552
553         switch (rid) {
554         case MAX8997_BUCK1:
555         case MAX8997_BUCK2:
556         case MAX8997_BUCK4:
557         case MAX8997_BUCK5:
558                 return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
559                                     max8997->ramp_delay * 1000);
560         }
561
562         return 0;
563 }
564
565 /*
566  * Assess the damage on the voltage setting of BUCK1,2,5 by the change.
567  *
568  * When GPIO-DVS mode is used for multiple bucks, changing the voltage value
569  * of one of the bucks may affect that of another buck, which is the side
570  * effect of the change (set_voltage). This function examines the GPIO-DVS
571  * configurations and checks whether such side-effect exists.
572  */
573 static int max8997_assess_side_effect(struct regulator_dev *rdev,
574                 u8 new_val, int *best)
575 {
576         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
577         int rid = rdev_get_id(rdev);
578         u8 *buckx_val[3];
579         bool buckx_gpiodvs[3];
580         int side_effect[8];
581         int min_side_effect = INT_MAX;
582         int i;
583
584         *best = -1;
585
586         switch (rid) {
587         case MAX8997_BUCK1:
588                 rid = 0;
589                 break;
590         case MAX8997_BUCK2:
591                 rid = 1;
592                 break;
593         case MAX8997_BUCK5:
594                 rid = 2;
595                 break;
596         default:
597                 return -EINVAL;
598         }
599
600         buckx_val[0] = max8997->buck1_vol;
601         buckx_val[1] = max8997->buck2_vol;
602         buckx_val[2] = max8997->buck5_vol;
603         buckx_gpiodvs[0] = max8997->buck1_gpiodvs;
604         buckx_gpiodvs[1] = max8997->buck2_gpiodvs;
605         buckx_gpiodvs[2] = max8997->buck5_gpiodvs;
606
607         for (i = 0; i < 8; i++) {
608                 int others;
609
610                 if (new_val != (buckx_val[rid])[i]) {
611                         side_effect[i] = -1;
612                         continue;
613                 }
614
615                 side_effect[i] = 0;
616                 for (others = 0; others < 3; others++) {
617                         int diff;
618
619                         if (others == rid)
620                                 continue;
621                         if (buckx_gpiodvs[others] == false)
622                                 continue; /* Not affected */
623                         diff = (buckx_val[others])[i] -
624                                 (buckx_val[others])[max8997->buck125_gpioindex];
625                         if (diff > 0)
626                                 side_effect[i] += diff;
627                         else if (diff < 0)
628                                 side_effect[i] -= diff;
629                 }
630                 if (side_effect[i] == 0) {
631                         *best = i;
632                         return 0; /* NO SIDE EFFECT! Use This! */
633                 }
634                 if (side_effect[i] < min_side_effect) {
635                         min_side_effect = side_effect[i];
636                         *best = i;
637                 }
638         }
639
640         if (*best == -1)
641                 return -EINVAL;
642
643         return side_effect[*best];
644 }
645
646 /*
647  * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
648  * max8997_set_voltage_ldobuck to do the job.
649  */
650 static int max8997_set_voltage_buck(struct regulator_dev *rdev,
651                 int min_uV, int max_uV, unsigned *selector)
652 {
653         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
654         int rid = rdev_get_id(rdev);
655         const struct voltage_map_desc *desc;
656         int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
657         bool gpio_dvs_mode = false;
658
659         if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
660                 return -EINVAL;
661
662         switch (rid) {
663         case MAX8997_BUCK1:
664                 if (max8997->buck1_gpiodvs)
665                         gpio_dvs_mode = true;
666                 break;
667         case MAX8997_BUCK2:
668                 if (max8997->buck2_gpiodvs)
669                         gpio_dvs_mode = true;
670                 break;
671         case MAX8997_BUCK5:
672                 if (max8997->buck5_gpiodvs)
673                         gpio_dvs_mode = true;
674                 break;
675         }
676
677         if (!gpio_dvs_mode)
678                 return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV,
679                                                 selector);
680
681         desc = reg_voltage_map[rid];
682         new_val = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
683         if (new_val < 0)
684                 return new_val;
685
686         tmp_dmg = INT_MAX;
687         tmp_idx = -1;
688         tmp_val = -1;
689         do {
690                 damage = max8997_assess_side_effect(rdev, new_val, &new_idx);
691                 if (damage == 0)
692                         goto out;
693
694                 if (tmp_dmg > damage) {
695                         tmp_idx = new_idx;
696                         tmp_val = new_val;
697                         tmp_dmg = damage;
698                 }
699
700                 new_val++;
701         } while (desc->min + desc->step * new_val <= desc->max);
702
703         new_idx = tmp_idx;
704         new_val = tmp_val;
705
706         if (max8997->ignore_gpiodvs_side_effect == false)
707                 return -EINVAL;
708
709         dev_warn(&rdev->dev, "MAX8997 GPIO-DVS Side Effect Warning: GPIO SET:"
710                         " %d -> %d\n", max8997->buck125_gpioindex, tmp_idx);
711
712 out:
713         if (new_idx < 0 || new_val < 0)
714                 return -EINVAL;
715
716         max8997->buck125_gpioindex = new_idx;
717         max8997_set_gpio(max8997);
718         *selector = new_val;
719
720         return 0;
721 }
722
723 static const int safeoutvolt[] = {
724         3300000,
725         4850000,
726         4900000,
727         4950000,
728 };
729
730 /* For SAFEOUT1 and SAFEOUT2 */
731 static int max8997_set_voltage_safeout(struct regulator_dev *rdev,
732                 int min_uV, int max_uV, unsigned *selector)
733 {
734         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
735         struct i2c_client *i2c = max8997->iodev->i2c;
736         int rid = rdev_get_id(rdev);
737         int reg, shift = 0, mask, ret;
738         int i = 0;
739         u8 val;
740
741         if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2)
742                 return -EINVAL;
743
744         for (i = 0; i < ARRAY_SIZE(safeoutvolt); i++) {
745                 if (min_uV <= safeoutvolt[i] &&
746                                 max_uV >= safeoutvolt[i])
747                         break;
748         }
749
750         if (i >= ARRAY_SIZE(safeoutvolt))
751                 return -EINVAL;
752
753         if (i == 0)
754                 val = 0x3;
755         else
756                 val = i - 1;
757
758         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
759         if (ret)
760                 return ret;
761
762         ret = max8997_update_reg(i2c, reg, val << shift, mask << shift);
763         *selector = val;
764
765         return ret;
766 }
767
768 static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
769 {
770         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
771         struct i2c_client *i2c = max8997->iodev->i2c;
772         int ret, reg, mask, pattern;
773         int rid = rdev_get_id(rdev);
774
775         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
776         if (ret)
777                 return ret;
778
779         max8997_read_reg(i2c, reg, &max8997->saved_states[rid]);
780
781         if (rid == MAX8997_LDO1 ||
782                         rid == MAX8997_LDO10 ||
783                         rid == MAX8997_LDO21) {
784                 dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n",
785                                 rdev->desc->name);
786                 return max8997_update_reg(i2c, reg, 0x40, mask);
787         }
788
789         dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
790                         rdev->desc->name, max8997->saved_states[rid] & mask,
791                         (~pattern) & mask);
792         return max8997_update_reg(i2c, reg, ~pattern, mask);
793 }
794
795 static struct regulator_ops max8997_ldo_ops = {
796         .list_voltage           = max8997_list_voltage,
797         .is_enabled             = max8997_reg_is_enabled,
798         .enable                 = max8997_reg_enable,
799         .disable                = max8997_reg_disable,
800         .get_voltage_sel        = max8997_get_voltage_sel,
801         .set_voltage            = max8997_set_voltage_ldobuck,
802         .set_voltage_time_sel   = max8997_set_voltage_ldobuck_time_sel,
803         .set_suspend_disable    = max8997_reg_disable_suspend,
804 };
805
806 static struct regulator_ops max8997_buck_ops = {
807         .list_voltage           = max8997_list_voltage,
808         .is_enabled             = max8997_reg_is_enabled,
809         .enable                 = max8997_reg_enable,
810         .disable                = max8997_reg_disable,
811         .get_voltage_sel        = max8997_get_voltage_sel,
812         .set_voltage            = max8997_set_voltage_buck,
813         .set_voltage_time_sel   = max8997_set_voltage_ldobuck_time_sel,
814         .set_suspend_disable    = max8997_reg_disable_suspend,
815 };
816
817 static struct regulator_ops max8997_fixedvolt_ops = {
818         .list_voltage           = max8997_list_voltage,
819         .is_enabled             = max8997_reg_is_enabled,
820         .enable                 = max8997_reg_enable,
821         .disable                = max8997_reg_disable,
822         .set_suspend_disable    = max8997_reg_disable_suspend,
823 };
824
825 static struct regulator_ops max8997_safeout_ops = {
826         .list_voltage           = max8997_list_voltage_safeout,
827         .is_enabled             = max8997_reg_is_enabled,
828         .enable                 = max8997_reg_enable,
829         .disable                = max8997_reg_disable,
830         .get_voltage_sel        = max8997_get_voltage_sel,
831         .set_voltage            = max8997_set_voltage_safeout,
832         .set_suspend_disable    = max8997_reg_disable_suspend,
833 };
834
835 static struct regulator_ops max8997_fixedstate_ops = {
836         .list_voltage           = max8997_list_voltage_charger_cv,
837         .get_voltage_sel        = max8997_get_voltage_sel,
838         .set_voltage            = max8997_set_voltage_charger_cv,
839 };
840
841 static int max8997_set_current_limit(struct regulator_dev *rdev,
842                                      int min_uA, int max_uA)
843 {
844         unsigned dummy;
845         int rid = rdev_get_id(rdev);
846
847         if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
848                 return -EINVAL;
849
850         /* Reuse max8997_set_voltage_ldobuck to set current_limit. */
851         return max8997_set_voltage_ldobuck(rdev, min_uA, max_uA, &dummy);
852 }
853
854 static int max8997_get_current_limit(struct regulator_dev *rdev)
855 {
856         int sel, rid = rdev_get_id(rdev);
857
858         if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
859                 return -EINVAL;
860
861         sel = max8997_get_voltage_sel(rdev);
862         if (sel < 0)
863                 return sel;
864
865         /* Reuse max8997_list_voltage to get current_limit. */
866         return max8997_list_voltage(rdev, sel);
867 }
868
869 static struct regulator_ops max8997_charger_ops = {
870         .is_enabled             = max8997_reg_is_enabled,
871         .enable                 = max8997_reg_enable,
872         .disable                = max8997_reg_disable,
873         .get_current_limit      = max8997_get_current_limit,
874         .set_current_limit      = max8997_set_current_limit,
875 };
876
877 static struct regulator_ops max8997_charger_fixedstate_ops = {
878         .get_current_limit      = max8997_get_current_limit,
879         .set_current_limit      = max8997_set_current_limit,
880 };
881
882 #define MAX8997_VOLTAGE_REGULATOR(_name, _ops) {\
883         .name           = #_name,               \
884         .id             = MAX8997_##_name,      \
885         .ops            = &_ops,                \
886         .type           = REGULATOR_VOLTAGE,    \
887         .owner          = THIS_MODULE,          \
888 }
889
890 #define MAX8997_CURRENT_REGULATOR(_name, _ops) {\
891         .name           = #_name,               \
892         .id             = MAX8997_##_name,      \
893         .ops            = &_ops,                \
894         .type           = REGULATOR_CURRENT,    \
895         .owner          = THIS_MODULE,          \
896 }
897
898 static struct regulator_desc regulators[] = {
899         MAX8997_VOLTAGE_REGULATOR(LDO1, max8997_ldo_ops),
900         MAX8997_VOLTAGE_REGULATOR(LDO2, max8997_ldo_ops),
901         MAX8997_VOLTAGE_REGULATOR(LDO3, max8997_ldo_ops),
902         MAX8997_VOLTAGE_REGULATOR(LDO4, max8997_ldo_ops),
903         MAX8997_VOLTAGE_REGULATOR(LDO5, max8997_ldo_ops),
904         MAX8997_VOLTAGE_REGULATOR(LDO6, max8997_ldo_ops),
905         MAX8997_VOLTAGE_REGULATOR(LDO7, max8997_ldo_ops),
906         MAX8997_VOLTAGE_REGULATOR(LDO8, max8997_ldo_ops),
907         MAX8997_VOLTAGE_REGULATOR(LDO9, max8997_ldo_ops),
908         MAX8997_VOLTAGE_REGULATOR(LDO10, max8997_ldo_ops),
909         MAX8997_VOLTAGE_REGULATOR(LDO11, max8997_ldo_ops),
910         MAX8997_VOLTAGE_REGULATOR(LDO12, max8997_ldo_ops),
911         MAX8997_VOLTAGE_REGULATOR(LDO13, max8997_ldo_ops),
912         MAX8997_VOLTAGE_REGULATOR(LDO14, max8997_ldo_ops),
913         MAX8997_VOLTAGE_REGULATOR(LDO15, max8997_ldo_ops),
914         MAX8997_VOLTAGE_REGULATOR(LDO16, max8997_ldo_ops),
915         MAX8997_VOLTAGE_REGULATOR(LDO17, max8997_ldo_ops),
916         MAX8997_VOLTAGE_REGULATOR(LDO18, max8997_ldo_ops),
917         MAX8997_VOLTAGE_REGULATOR(LDO21, max8997_ldo_ops),
918         MAX8997_VOLTAGE_REGULATOR(BUCK1, max8997_buck_ops),
919         MAX8997_VOLTAGE_REGULATOR(BUCK2, max8997_buck_ops),
920         MAX8997_VOLTAGE_REGULATOR(BUCK3, max8997_buck_ops),
921         MAX8997_VOLTAGE_REGULATOR(BUCK4, max8997_buck_ops),
922         MAX8997_VOLTAGE_REGULATOR(BUCK5, max8997_buck_ops),
923         MAX8997_VOLTAGE_REGULATOR(BUCK6, max8997_fixedvolt_ops),
924         MAX8997_VOLTAGE_REGULATOR(BUCK7, max8997_buck_ops),
925         MAX8997_VOLTAGE_REGULATOR(EN32KHZ_AP, max8997_fixedvolt_ops),
926         MAX8997_VOLTAGE_REGULATOR(EN32KHZ_CP, max8997_fixedvolt_ops),
927         MAX8997_VOLTAGE_REGULATOR(ENVICHG, max8997_fixedvolt_ops),
928         MAX8997_VOLTAGE_REGULATOR(ESAFEOUT1, max8997_safeout_ops),
929         MAX8997_VOLTAGE_REGULATOR(ESAFEOUT2, max8997_safeout_ops),
930         MAX8997_VOLTAGE_REGULATOR(CHARGER_CV, max8997_fixedstate_ops),
931         MAX8997_CURRENT_REGULATOR(CHARGER, max8997_charger_ops),
932         MAX8997_CURRENT_REGULATOR(CHARGER_TOPOFF,
933                                   max8997_charger_fixedstate_ops),
934 };
935
936 #ifdef CONFIG_OF
937 static int max8997_pmic_dt_parse_dvs_gpio(struct platform_device *pdev,
938                         struct max8997_platform_data *pdata,
939                         struct device_node *pmic_np)
940 {
941         int i, gpio;
942
943         for (i = 0; i < 3; i++) {
944                 gpio = of_get_named_gpio(pmic_np,
945                                         "max8997,pmic-buck125-dvs-gpios", i);
946                 if (!gpio_is_valid(gpio)) {
947                         dev_err(&pdev->dev, "invalid gpio[%d]: %d\n", i, gpio);
948                         return -EINVAL;
949                 }
950                 pdata->buck125_gpios[i] = gpio;
951         }
952         return 0;
953 }
954
955 static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
956                                         struct max8997_platform_data *pdata)
957 {
958         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
959         struct device_node *pmic_np, *regulators_np, *reg_np;
960         struct max8997_regulator_data *rdata;
961         unsigned int i, dvs_voltage_nr = 1, ret;
962
963         pmic_np = iodev->dev->of_node;
964         if (!pmic_np) {
965                 dev_err(&pdev->dev, "could not find pmic sub-node\n");
966                 return -ENODEV;
967         }
968
969         regulators_np = of_find_node_by_name(pmic_np, "regulators");
970         if (!regulators_np) {
971                 dev_err(&pdev->dev, "could not find regulators sub-node\n");
972                 return -EINVAL;
973         }
974
975         /* count the number of regulators to be supported in pmic */
976         pdata->num_regulators = 0;
977         for_each_child_of_node(regulators_np, reg_np)
978                 pdata->num_regulators++;
979
980         rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) *
981                                 pdata->num_regulators, GFP_KERNEL);
982         if (!rdata) {
983                 dev_err(&pdev->dev, "could not allocate memory for regulator data\n");
984                 return -ENOMEM;
985         }
986
987         pdata->regulators = rdata;
988         for_each_child_of_node(regulators_np, reg_np) {
989                 for (i = 0; i < ARRAY_SIZE(regulators); i++)
990                         if (!of_node_cmp(reg_np->name, regulators[i].name))
991                                 break;
992
993                 if (i == ARRAY_SIZE(regulators)) {
994                         dev_warn(&pdev->dev, "don't know how to configure regulator %s\n",
995                                  reg_np->name);
996                         continue;
997                 }
998
999                 rdata->id = i;
1000                 rdata->initdata = of_get_regulator_init_data(&pdev->dev,
1001                                                              reg_np);
1002                 rdata->reg_node = reg_np;
1003                 rdata++;
1004         }
1005
1006         if (of_get_property(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs", NULL))
1007                 pdata->buck1_gpiodvs = true;
1008
1009         if (of_get_property(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs", NULL))
1010                 pdata->buck2_gpiodvs = true;
1011
1012         if (of_get_property(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs", NULL))
1013                 pdata->buck5_gpiodvs = true;
1014
1015         if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1016                                                 pdata->buck5_gpiodvs) {
1017                 ret = max8997_pmic_dt_parse_dvs_gpio(pdev, pdata, pmic_np);
1018                 if (ret)
1019                         return -EINVAL;
1020
1021                 if (of_property_read_u32(pmic_np,
1022                                 "max8997,pmic-buck125-default-dvs-idx",
1023                                 &pdata->buck125_default_idx)) {
1024                         pdata->buck125_default_idx = 0;
1025                 } else {
1026                         if (pdata->buck125_default_idx >= 8) {
1027                                 pdata->buck125_default_idx = 0;
1028                                 dev_info(&pdev->dev, "invalid value for default dvs index, using 0 instead\n");
1029                         }
1030                 }
1031
1032                 if (of_get_property(pmic_np,
1033                         "max8997,pmic-ignore-gpiodvs-side-effect", NULL))
1034                         pdata->ignore_gpiodvs_side_effect = true;
1035
1036                 dvs_voltage_nr = 8;
1037         }
1038
1039         if (of_property_read_u32_array(pmic_np,
1040                                 "max8997,pmic-buck1-dvs-voltage",
1041                                 pdata->buck1_voltage, dvs_voltage_nr)) {
1042                 dev_err(&pdev->dev, "buck1 voltages not specified\n");
1043                 return -EINVAL;
1044         }
1045
1046         if (of_property_read_u32_array(pmic_np,
1047                                 "max8997,pmic-buck2-dvs-voltage",
1048                                 pdata->buck2_voltage, dvs_voltage_nr)) {
1049                 dev_err(&pdev->dev, "buck2 voltages not specified\n");
1050                 return -EINVAL;
1051         }
1052
1053         if (of_property_read_u32_array(pmic_np,
1054                                 "max8997,pmic-buck5-dvs-voltage",
1055                                 pdata->buck5_voltage, dvs_voltage_nr)) {
1056                 dev_err(&pdev->dev, "buck5 voltages not specified\n");
1057                 return -EINVAL;
1058         }
1059
1060         return 0;
1061 }
1062 #else
1063 static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
1064                                         struct max8997_platform_data *pdata)
1065 {
1066         return 0;
1067 }
1068 #endif /* CONFIG_OF */
1069
1070 static int max8997_pmic_probe(struct platform_device *pdev)
1071 {
1072         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
1073         struct max8997_platform_data *pdata = iodev->pdata;
1074         struct regulator_config config = { };
1075         struct regulator_dev **rdev;
1076         struct max8997_data *max8997;
1077         struct i2c_client *i2c;
1078         int i, ret, size, nr_dvs;
1079         u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
1080
1081         if (IS_ERR_OR_NULL(pdata)) {
1082                 dev_err(pdev->dev.parent, "No platform init data supplied.\n");
1083                 return -ENODEV;
1084         }
1085
1086         if (iodev->dev->of_node) {
1087                 ret = max8997_pmic_dt_parse_pdata(pdev, pdata);
1088                 if (ret)
1089                         return ret;
1090         }
1091
1092         max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
1093                                GFP_KERNEL);
1094         if (!max8997)
1095                 return -ENOMEM;
1096
1097         size = sizeof(struct regulator_dev *) * pdata->num_regulators;
1098         max8997->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
1099         if (!max8997->rdev)
1100                 return -ENOMEM;
1101
1102         rdev = max8997->rdev;
1103         max8997->dev = &pdev->dev;
1104         max8997->iodev = iodev;
1105         max8997->num_regulators = pdata->num_regulators;
1106         platform_set_drvdata(pdev, max8997);
1107         i2c = max8997->iodev->i2c;
1108
1109         max8997->buck125_gpioindex = pdata->buck125_default_idx;
1110         max8997->buck1_gpiodvs = pdata->buck1_gpiodvs;
1111         max8997->buck2_gpiodvs = pdata->buck2_gpiodvs;
1112         max8997->buck5_gpiodvs = pdata->buck5_gpiodvs;
1113         memcpy(max8997->buck125_gpios, pdata->buck125_gpios, sizeof(int) * 3);
1114         max8997->ignore_gpiodvs_side_effect = pdata->ignore_gpiodvs_side_effect;
1115
1116         nr_dvs = (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1117                         pdata->buck5_gpiodvs) ? 8 : 1;
1118
1119         for (i = 0; i < nr_dvs; i++) {
1120                 max8997->buck1_vol[i] = ret =
1121                         max8997_get_voltage_proper_val(
1122                                         &buck1245_voltage_map_desc,
1123                                         pdata->buck1_voltage[i],
1124                                         pdata->buck1_voltage[i] +
1125                                         buck1245_voltage_map_desc.step);
1126                 if (ret < 0)
1127                         goto err_out;
1128
1129                 max8997->buck2_vol[i] = ret =
1130                         max8997_get_voltage_proper_val(
1131                                         &buck1245_voltage_map_desc,
1132                                         pdata->buck2_voltage[i],
1133                                         pdata->buck2_voltage[i] +
1134                                         buck1245_voltage_map_desc.step);
1135                 if (ret < 0)
1136                         goto err_out;
1137
1138                 max8997->buck5_vol[i] = ret =
1139                         max8997_get_voltage_proper_val(
1140                                         &buck1245_voltage_map_desc,
1141                                         pdata->buck5_voltage[i],
1142                                         pdata->buck5_voltage[i] +
1143                                         buck1245_voltage_map_desc.step);
1144                 if (ret < 0)
1145                         goto err_out;
1146
1147                 if (max_buck1 < max8997->buck1_vol[i])
1148                         max_buck1 = max8997->buck1_vol[i];
1149                 if (max_buck2 < max8997->buck2_vol[i])
1150                         max_buck2 = max8997->buck2_vol[i];
1151                 if (max_buck5 < max8997->buck5_vol[i])
1152                         max_buck5 = max8997->buck5_vol[i];
1153         }
1154
1155         /* For the safety, set max voltage before setting up */
1156         for (i = 0; i < 8; i++) {
1157                 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1158                                 max_buck1, 0x3f);
1159                 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1160                                 max_buck2, 0x3f);
1161                 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1162                                 max_buck5, 0x3f);
1163         }
1164
1165         /* Initialize all the DVS related BUCK registers */
1166         for (i = 0; i < nr_dvs; i++) {
1167                 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1168                                 max8997->buck1_vol[i],
1169                                 0x3f);
1170                 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1171                                 max8997->buck2_vol[i],
1172                                 0x3f);
1173                 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1174                                 max8997->buck5_vol[i],
1175                                 0x3f);
1176         }
1177
1178         /*
1179          * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them.
1180          * If at least one of them cares, set gpios.
1181          */
1182         if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1183                         pdata->buck5_gpiodvs) {
1184
1185                 if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
1186                                 !gpio_is_valid(pdata->buck125_gpios[1]) ||
1187                                 !gpio_is_valid(pdata->buck125_gpios[2])) {
1188                         dev_err(&pdev->dev, "GPIO NOT VALID\n");
1189                         ret = -EINVAL;
1190                         goto err_out;
1191                 }
1192
1193                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[0],
1194                                         "MAX8997 SET1");
1195                 if (ret)
1196                         goto err_out;
1197
1198                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[1],
1199                                         "MAX8997 SET2");
1200                 if (ret)
1201                         goto err_out;
1202
1203                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[2],
1204                                 "MAX8997 SET3");
1205                 if (ret)
1206                         goto err_out;
1207
1208                 gpio_direction_output(pdata->buck125_gpios[0],
1209                                 (max8997->buck125_gpioindex >> 2)
1210                                 & 0x1); /* SET1 */
1211                 gpio_direction_output(pdata->buck125_gpios[1],
1212                                 (max8997->buck125_gpioindex >> 1)
1213                                 & 0x1); /* SET2 */
1214                 gpio_direction_output(pdata->buck125_gpios[2],
1215                                 (max8997->buck125_gpioindex >> 0)
1216                                 & 0x1); /* SET3 */
1217         }
1218
1219         /* DVS-GPIO disabled */
1220         max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ?
1221                         (1 << 1) : (0 << 1), 1 << 1);
1222         max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ?
1223                         (1 << 1) : (0 << 1), 1 << 1);
1224         max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ?
1225                         (1 << 1) : (0 << 1), 1 << 1);
1226
1227         /* Misc Settings */
1228         max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
1229         max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
1230
1231         for (i = 0; i < pdata->num_regulators; i++) {
1232                 const struct voltage_map_desc *desc;
1233                 int id = pdata->regulators[i].id;
1234
1235                 desc = reg_voltage_map[id];
1236                 if (desc)
1237                         regulators[id].n_voltages =
1238                                 (desc->max - desc->min) / desc->step + 1;
1239                 else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2)
1240                         regulators[id].n_voltages = 4;
1241                 else if (id == MAX8997_CHARGER_CV)
1242                         regulators[id].n_voltages = 16;
1243
1244                 config.dev = max8997->dev;
1245                 config.init_data = pdata->regulators[i].initdata;
1246                 config.driver_data = max8997;
1247                 config.of_node = pdata->regulators[i].reg_node;
1248
1249                 rdev[i] = regulator_register(&regulators[id], &config);
1250                 if (IS_ERR(rdev[i])) {
1251                         ret = PTR_ERR(rdev[i]);
1252                         dev_err(max8997->dev, "regulator init failed for %d\n",
1253                                         id);
1254                         rdev[i] = NULL;
1255                         goto err;
1256                 }
1257         }
1258
1259         return 0;
1260 err:
1261         while (--i >= 0)
1262                 regulator_unregister(rdev[i]);
1263 err_out:
1264         return ret;
1265 }
1266
1267 static int max8997_pmic_remove(struct platform_device *pdev)
1268 {
1269         struct max8997_data *max8997 = platform_get_drvdata(pdev);
1270         struct regulator_dev **rdev = max8997->rdev;
1271         int i;
1272
1273         for (i = 0; i < max8997->num_regulators; i++)
1274                 regulator_unregister(rdev[i]);
1275         return 0;
1276 }
1277
1278 static const struct platform_device_id max8997_pmic_id[] = {
1279         { "max8997-pmic", 0},
1280         { },
1281 };
1282 MODULE_DEVICE_TABLE(platform, max8997_pmic_id);
1283
1284 static struct platform_driver max8997_pmic_driver = {
1285         .driver = {
1286                 .name = "max8997-pmic",
1287                 .owner = THIS_MODULE,
1288         },
1289         .probe = max8997_pmic_probe,
1290         .remove = max8997_pmic_remove,
1291         .id_table = max8997_pmic_id,
1292 };
1293
1294 static int __init max8997_pmic_init(void)
1295 {
1296         return platform_driver_register(&max8997_pmic_driver);
1297 }
1298 subsys_initcall(max8997_pmic_init);
1299
1300 static void __exit max8997_pmic_cleanup(void)
1301 {
1302         platform_driver_unregister(&max8997_pmic_driver);
1303 }
1304 module_exit(max8997_pmic_cleanup);
1305
1306 MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver");
1307 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1308 MODULE_LICENSE("GPL");