Merge remote-tracking branch 'regulator/topic/change' into regulator-next
[linux-3.10.git] / drivers / regulator / max8998.c
1 /*
2  * max8998.c - Voltage regulator driver for the Maxim 8998
3  *
4  *  Copyright (C) 2009-2010 Samsung Electronics
5  *  Kyungmin Park <kyungmin.park@samsung.com>
6  *  Marek Szyprowski <m.szyprowski@samsung.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21  */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/i2c.h>
26 #include <linux/err.h>
27 #include <linux/gpio.h>
28 #include <linux/slab.h>
29 #include <linux/interrupt.h>
30 #include <linux/mutex.h>
31 #include <linux/platform_device.h>
32 #include <linux/regulator/driver.h>
33 #include <linux/mfd/max8998.h>
34 #include <linux/mfd/max8998-private.h>
35
36 struct max8998_data {
37         struct device           *dev;
38         struct max8998_dev      *iodev;
39         int                     num_regulators;
40         struct regulator_dev    **rdev;
41         u8                      buck1_vol[4]; /* voltages for selection */
42         u8                      buck2_vol[2];
43         unsigned int            buck1_idx; /* index to last changed voltage */
44                                            /* value in a set */
45         unsigned int            buck2_idx;
46 };
47
48 struct voltage_map_desc {
49         int min;
50         int max;
51         int step;
52 };
53
54 /* Voltage maps */
55 static const struct voltage_map_desc ldo23_voltage_map_desc = {
56         .min = 800,     .step = 50,     .max = 1300,
57 };
58 static const struct voltage_map_desc ldo456711_voltage_map_desc = {
59         .min = 1600,    .step = 100,    .max = 3600,
60 };
61 static const struct voltage_map_desc ldo8_voltage_map_desc = {
62         .min = 3000,    .step = 100,    .max = 3600,
63 };
64 static const struct voltage_map_desc ldo9_voltage_map_desc = {
65         .min = 2800,    .step = 100,    .max = 3100,
66 };
67 static const struct voltage_map_desc ldo10_voltage_map_desc = {
68         .min = 950,     .step = 50,     .max = 1300,
69 };
70 static const struct voltage_map_desc ldo1213_voltage_map_desc = {
71         .min = 800,     .step = 100,    .max = 3300,
72 };
73 static const struct voltage_map_desc ldo1415_voltage_map_desc = {
74         .min = 1200,    .step = 100,    .max = 3300,
75 };
76 static const struct voltage_map_desc ldo1617_voltage_map_desc = {
77         .min = 1600,    .step = 100,    .max = 3600,
78 };
79 static const struct voltage_map_desc buck12_voltage_map_desc = {
80         .min = 750,     .step = 25,     .max = 1525,
81 };
82 static const struct voltage_map_desc buck3_voltage_map_desc = {
83         .min = 1600,    .step = 100,    .max = 3600,
84 };
85 static const struct voltage_map_desc buck4_voltage_map_desc = {
86         .min = 800,     .step = 100,    .max = 2300,
87 };
88
89 static const struct voltage_map_desc *ldo_voltage_map[] = {
90         NULL,
91         NULL,
92         &ldo23_voltage_map_desc,        /* LDO2 */
93         &ldo23_voltage_map_desc,        /* LDO3 */
94         &ldo456711_voltage_map_desc,    /* LDO4 */
95         &ldo456711_voltage_map_desc,    /* LDO5 */
96         &ldo456711_voltage_map_desc,    /* LDO6 */
97         &ldo456711_voltage_map_desc,    /* LDO7 */
98         &ldo8_voltage_map_desc,         /* LDO8 */
99         &ldo9_voltage_map_desc,         /* LDO9 */
100         &ldo10_voltage_map_desc,        /* LDO10 */
101         &ldo456711_voltage_map_desc,    /* LDO11 */
102         &ldo1213_voltage_map_desc,      /* LDO12 */
103         &ldo1213_voltage_map_desc,      /* LDO13 */
104         &ldo1415_voltage_map_desc,      /* LDO14 */
105         &ldo1415_voltage_map_desc,      /* LDO15 */
106         &ldo1617_voltage_map_desc,      /* LDO16 */
107         &ldo1617_voltage_map_desc,      /* LDO17 */
108         &buck12_voltage_map_desc,       /* BUCK1 */
109         &buck12_voltage_map_desc,       /* BUCK2 */
110         &buck3_voltage_map_desc,        /* BUCK3 */
111         &buck4_voltage_map_desc,        /* BUCK4 */
112 };
113
114 static int max8998_get_enable_register(struct regulator_dev *rdev,
115                                         int *reg, int *shift)
116 {
117         int ldo = rdev_get_id(rdev);
118
119         switch (ldo) {
120         case MAX8998_LDO2 ... MAX8998_LDO5:
121                 *reg = MAX8998_REG_ONOFF1;
122                 *shift = 3 - (ldo - MAX8998_LDO2);
123                 break;
124         case MAX8998_LDO6 ... MAX8998_LDO13:
125                 *reg = MAX8998_REG_ONOFF2;
126                 *shift = 7 - (ldo - MAX8998_LDO6);
127                 break;
128         case MAX8998_LDO14 ... MAX8998_LDO17:
129                 *reg = MAX8998_REG_ONOFF3;
130                 *shift = 7 - (ldo - MAX8998_LDO14);
131                 break;
132         case MAX8998_BUCK1 ... MAX8998_BUCK4:
133                 *reg = MAX8998_REG_ONOFF1;
134                 *shift = 7 - (ldo - MAX8998_BUCK1);
135                 break;
136         case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
137                 *reg = MAX8998_REG_ONOFF4;
138                 *shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
139                 break;
140         case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
141                 *reg = MAX8998_REG_CHGR2;
142                 *shift = 7 - (ldo - MAX8998_ESAFEOUT1);
143                 break;
144         default:
145                 return -EINVAL;
146         }
147
148         return 0;
149 }
150
151 static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
152 {
153         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
154         struct i2c_client *i2c = max8998->iodev->i2c;
155         int ret, reg, shift = 8;
156         u8 val;
157
158         ret = max8998_get_enable_register(rdev, &reg, &shift);
159         if (ret)
160                 return ret;
161
162         ret = max8998_read_reg(i2c, reg, &val);
163         if (ret)
164                 return ret;
165
166         return val & (1 << shift);
167 }
168
169 static int max8998_ldo_enable(struct regulator_dev *rdev)
170 {
171         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
172         struct i2c_client *i2c = max8998->iodev->i2c;
173         int reg, shift = 8, ret;
174
175         ret = max8998_get_enable_register(rdev, &reg, &shift);
176         if (ret)
177                 return ret;
178
179         return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
180 }
181
182 static int max8998_ldo_disable(struct regulator_dev *rdev)
183 {
184         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
185         struct i2c_client *i2c = max8998->iodev->i2c;
186         int reg, shift = 8, ret;
187
188         ret = max8998_get_enable_register(rdev, &reg, &shift);
189         if (ret)
190                 return ret;
191
192         return max8998_update_reg(i2c, reg, 0, 1<<shift);
193 }
194
195 static int max8998_get_voltage_register(struct regulator_dev *rdev,
196                                 int *_reg, int *_shift, int *_mask)
197 {
198         int ldo = rdev_get_id(rdev);
199         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
200         int reg, shift = 0, mask = 0xff;
201
202         switch (ldo) {
203         case MAX8998_LDO2 ... MAX8998_LDO3:
204                 reg = MAX8998_REG_LDO2_LDO3;
205                 mask = 0xf;
206                 if (ldo == MAX8998_LDO2)
207                         shift = 4;
208                 else
209                         shift = 0;
210                 break;
211         case MAX8998_LDO4 ... MAX8998_LDO7:
212                 reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
213                 break;
214         case MAX8998_LDO8 ... MAX8998_LDO9:
215                 reg = MAX8998_REG_LDO8_LDO9;
216                 mask = 0xf;
217                 if (ldo == MAX8998_LDO8)
218                         shift = 4;
219                 else
220                         shift = 0;
221                 break;
222         case MAX8998_LDO10 ... MAX8998_LDO11:
223                 reg = MAX8998_REG_LDO10_LDO11;
224                 if (ldo == MAX8998_LDO10) {
225                         shift = 5;
226                         mask = 0x7;
227                 } else {
228                         shift = 0;
229                         mask = 0x1f;
230                 }
231                 break;
232         case MAX8998_LDO12 ... MAX8998_LDO17:
233                 reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
234                 break;
235         case MAX8998_BUCK1:
236                 reg = MAX8998_REG_BUCK1_VOLTAGE1 + max8998->buck1_idx;
237                 break;
238         case MAX8998_BUCK2:
239                 reg = MAX8998_REG_BUCK2_VOLTAGE1 + max8998->buck2_idx;
240                 break;
241         case MAX8998_BUCK3:
242                 reg = MAX8998_REG_BUCK3;
243                 break;
244         case MAX8998_BUCK4:
245                 reg = MAX8998_REG_BUCK4;
246                 break;
247         default:
248                 return -EINVAL;
249         }
250
251         *_reg = reg;
252         *_shift = shift;
253         *_mask = mask;
254
255         return 0;
256 }
257
258 static int max8998_get_voltage_sel(struct regulator_dev *rdev)
259 {
260         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
261         struct i2c_client *i2c = max8998->iodev->i2c;
262         int reg, shift = 0, mask, ret;
263         u8 val;
264
265         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
266         if (ret)
267                 return ret;
268
269         ret = max8998_read_reg(i2c, reg, &val);
270         if (ret)
271                 return ret;
272
273         val >>= shift;
274         val &= mask;
275
276         return val;
277 }
278
279 static int max8998_set_voltage_ldo_sel(struct regulator_dev *rdev,
280                                        unsigned selector)
281 {
282         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
283         struct i2c_client *i2c = max8998->iodev->i2c;
284         int reg, shift = 0, mask, ret;
285
286         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
287         if (ret)
288                 return ret;
289
290         ret = max8998_update_reg(i2c, reg, selector<<shift, mask<<shift);
291
292         return ret;
293 }
294
295 static inline void buck1_gpio_set(int gpio1, int gpio2, int v)
296 {
297         gpio_set_value(gpio1, v & 0x1);
298         gpio_set_value(gpio2, (v >> 1) & 0x1);
299 }
300
301 static inline void buck2_gpio_set(int gpio, int v)
302 {
303         gpio_set_value(gpio, v & 0x1);
304 }
305
306 static int max8998_set_voltage_buck_sel(struct regulator_dev *rdev,
307                                         unsigned selector)
308 {
309         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
310         struct max8998_platform_data *pdata =
311                 dev_get_platdata(max8998->iodev->dev);
312         struct i2c_client *i2c = max8998->iodev->i2c;
313         int buck = rdev_get_id(rdev);
314         int reg, shift = 0, mask, ret;
315         int j, previous_sel;
316         static u8 buck1_last_val;
317
318         ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
319         if (ret)
320                 return ret;
321
322         previous_sel = max8998_get_voltage_sel(rdev);
323
324         /* Check if voltage needs to be changed */
325         /* if previous_voltage equal new voltage, return */
326         if (previous_sel == selector) {
327                 dev_dbg(max8998->dev, "No voltage change, old:%d, new:%d\n",
328                         regulator_list_voltage_linear(rdev, previous_sel),
329                         regulator_list_voltage_linear(rdev, selector));
330                 return ret;
331         }
332
333         switch (buck) {
334         case MAX8998_BUCK1:
335                 dev_dbg(max8998->dev,
336                         "BUCK1, selector:%d, buck1_vol1:%d, buck1_vol2:%d\n"
337                         "buck1_vol3:%d, buck1_vol4:%d\n",
338                         selector, max8998->buck1_vol[0], max8998->buck1_vol[1],
339                         max8998->buck1_vol[2], max8998->buck1_vol[3]);
340
341                 if (gpio_is_valid(pdata->buck1_set1) &&
342                     gpio_is_valid(pdata->buck1_set2)) {
343
344                         /* check if requested voltage */
345                         /* value is already defined */
346                         for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
347                                 if (max8998->buck1_vol[j] == selector) {
348                                         max8998->buck1_idx = j;
349                                         buck1_gpio_set(pdata->buck1_set1,
350                                                        pdata->buck1_set2, j);
351                                         goto buck1_exit;
352                                 }
353                         }
354
355                         if (pdata->buck_voltage_lock)
356                                 return -EINVAL;
357
358                         /* no predefine regulator found */
359                         max8998->buck1_idx = (buck1_last_val % 2) + 2;
360                         dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
361                                 max8998->buck1_idx);
362                         max8998->buck1_vol[max8998->buck1_idx] = selector;
363                         ret = max8998_get_voltage_register(rdev, &reg,
364                                                            &shift,
365                                                            &mask);
366                         ret = max8998_write_reg(i2c, reg, selector);
367                         buck1_gpio_set(pdata->buck1_set1,
368                                        pdata->buck1_set2, max8998->buck1_idx);
369                         buck1_last_val++;
370 buck1_exit:
371                         dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
372                                 i2c->name, gpio_get_value(pdata->buck1_set1),
373                                 gpio_get_value(pdata->buck1_set2));
374                         break;
375                 } else {
376                         ret = max8998_write_reg(i2c, reg, selector);
377                 }
378                 break;
379
380         case MAX8998_BUCK2:
381                 dev_dbg(max8998->dev,
382                         "BUCK2, selector:%d buck2_vol1:%d, buck2_vol2:%d\n",
383                         selector, max8998->buck2_vol[0], max8998->buck2_vol[1]);
384                 if (gpio_is_valid(pdata->buck2_set3)) {
385
386                         /* check if requested voltage */
387                         /* value is already defined */
388                         for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
389                                 if (max8998->buck2_vol[j] == selector) {
390                                         max8998->buck2_idx = j;
391                                         buck2_gpio_set(pdata->buck2_set3, j);
392                                         goto buck2_exit;
393                                 }
394                         }
395
396                         if (pdata->buck_voltage_lock)
397                                 return -EINVAL;
398
399                         max8998_get_voltage_register(rdev,
400                                         &reg, &shift, &mask);
401                         ret = max8998_write_reg(i2c, reg, selector);
402                         max8998->buck2_vol[max8998->buck2_idx] = selector;
403                         buck2_gpio_set(pdata->buck2_set3, max8998->buck2_idx);
404 buck2_exit:
405                         dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
406                                 gpio_get_value(pdata->buck2_set3));
407                 } else {
408                         ret = max8998_write_reg(i2c, reg, selector);
409                 }
410                 break;
411
412         case MAX8998_BUCK3:
413         case MAX8998_BUCK4:
414                 ret = max8998_update_reg(i2c, reg, selector<<shift,
415                                          mask<<shift);
416                 break;
417         }
418
419         return ret;
420 }
421
422 static int max8998_set_voltage_buck_time_sel(struct regulator_dev *rdev,
423                                              unsigned int old_selector,
424                                              unsigned int new_selector)
425 {
426         struct max8998_data *max8998 = rdev_get_drvdata(rdev);
427         struct i2c_client *i2c = max8998->iodev->i2c;
428         const struct voltage_map_desc *desc;
429         int buck = rdev_get_id(rdev);
430         u8 val = 0;
431         int difference, ret;
432
433         if (buck < MAX8998_BUCK1 || buck > MAX8998_BUCK4)
434                 return -EINVAL;
435
436         desc = ldo_voltage_map[buck];
437
438         /* Voltage stabilization */
439         ret = max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
440         if (ret)
441                 return ret;
442
443         /* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
444         /* MAX8998 has ENRAMP bit implemented, so test it*/
445         if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
446                 return 0;
447
448         difference = (new_selector - old_selector) * desc->step;
449         if (difference > 0)
450                 return difference / ((val & 0x0f) + 1);
451
452         return 0;
453 }
454
455 static struct regulator_ops max8998_ldo_ops = {
456         .list_voltage           = regulator_list_voltage_linear,
457         .map_voltage            = regulator_map_voltage_linear,
458         .is_enabled             = max8998_ldo_is_enabled,
459         .enable                 = max8998_ldo_enable,
460         .disable                = max8998_ldo_disable,
461         .get_voltage_sel        = max8998_get_voltage_sel,
462         .set_voltage_sel        = max8998_set_voltage_ldo_sel,
463 };
464
465 static struct regulator_ops max8998_buck_ops = {
466         .list_voltage           = regulator_list_voltage_linear,
467         .map_voltage            = regulator_map_voltage_linear,
468         .is_enabled             = max8998_ldo_is_enabled,
469         .enable                 = max8998_ldo_enable,
470         .disable                = max8998_ldo_disable,
471         .get_voltage_sel        = max8998_get_voltage_sel,
472         .set_voltage_sel        = max8998_set_voltage_buck_sel,
473         .set_voltage_time_sel   = max8998_set_voltage_buck_time_sel,
474 };
475
476 static struct regulator_ops max8998_others_ops = {
477         .is_enabled             = max8998_ldo_is_enabled,
478         .enable                 = max8998_ldo_enable,
479         .disable                = max8998_ldo_disable,
480 };
481
482 static struct regulator_desc regulators[] = {
483         {
484                 .name           = "LDO2",
485                 .id             = MAX8998_LDO2,
486                 .ops            = &max8998_ldo_ops,
487                 .type           = REGULATOR_VOLTAGE,
488                 .owner          = THIS_MODULE,
489         }, {
490                 .name           = "LDO3",
491                 .id             = MAX8998_LDO3,
492                 .ops            = &max8998_ldo_ops,
493                 .type           = REGULATOR_VOLTAGE,
494                 .owner          = THIS_MODULE,
495         }, {
496                 .name           = "LDO4",
497                 .id             = MAX8998_LDO4,
498                 .ops            = &max8998_ldo_ops,
499                 .type           = REGULATOR_VOLTAGE,
500                 .owner          = THIS_MODULE,
501         }, {
502                 .name           = "LDO5",
503                 .id             = MAX8998_LDO5,
504                 .ops            = &max8998_ldo_ops,
505                 .type           = REGULATOR_VOLTAGE,
506                 .owner          = THIS_MODULE,
507         }, {
508                 .name           = "LDO6",
509                 .id             = MAX8998_LDO6,
510                 .ops            = &max8998_ldo_ops,
511                 .type           = REGULATOR_VOLTAGE,
512                 .owner          = THIS_MODULE,
513         }, {
514                 .name           = "LDO7",
515                 .id             = MAX8998_LDO7,
516                 .ops            = &max8998_ldo_ops,
517                 .type           = REGULATOR_VOLTAGE,
518                 .owner          = THIS_MODULE,
519         }, {
520                 .name           = "LDO8",
521                 .id             = MAX8998_LDO8,
522                 .ops            = &max8998_ldo_ops,
523                 .type           = REGULATOR_VOLTAGE,
524                 .owner          = THIS_MODULE,
525         }, {
526                 .name           = "LDO9",
527                 .id             = MAX8998_LDO9,
528                 .ops            = &max8998_ldo_ops,
529                 .type           = REGULATOR_VOLTAGE,
530                 .owner          = THIS_MODULE,
531         }, {
532                 .name           = "LDO10",
533                 .id             = MAX8998_LDO10,
534                 .ops            = &max8998_ldo_ops,
535                 .type           = REGULATOR_VOLTAGE,
536                 .owner          = THIS_MODULE,
537         }, {
538                 .name           = "LDO11",
539                 .id             = MAX8998_LDO11,
540                 .ops            = &max8998_ldo_ops,
541                 .type           = REGULATOR_VOLTAGE,
542                 .owner          = THIS_MODULE,
543         }, {
544                 .name           = "LDO12",
545                 .id             = MAX8998_LDO12,
546                 .ops            = &max8998_ldo_ops,
547                 .type           = REGULATOR_VOLTAGE,
548                 .owner          = THIS_MODULE,
549         }, {
550                 .name           = "LDO13",
551                 .id             = MAX8998_LDO13,
552                 .ops            = &max8998_ldo_ops,
553                 .type           = REGULATOR_VOLTAGE,
554                 .owner          = THIS_MODULE,
555         }, {
556                 .name           = "LDO14",
557                 .id             = MAX8998_LDO14,
558                 .ops            = &max8998_ldo_ops,
559                 .type           = REGULATOR_VOLTAGE,
560                 .owner          = THIS_MODULE,
561         }, {
562                 .name           = "LDO15",
563                 .id             = MAX8998_LDO15,
564                 .ops            = &max8998_ldo_ops,
565                 .type           = REGULATOR_VOLTAGE,
566                 .owner          = THIS_MODULE,
567         }, {
568                 .name           = "LDO16",
569                 .id             = MAX8998_LDO16,
570                 .ops            = &max8998_ldo_ops,
571                 .type           = REGULATOR_VOLTAGE,
572                 .owner          = THIS_MODULE,
573         }, {
574                 .name           = "LDO17",
575                 .id             = MAX8998_LDO17,
576                 .ops            = &max8998_ldo_ops,
577                 .type           = REGULATOR_VOLTAGE,
578                 .owner          = THIS_MODULE,
579         }, {
580                 .name           = "BUCK1",
581                 .id             = MAX8998_BUCK1,
582                 .ops            = &max8998_buck_ops,
583                 .type           = REGULATOR_VOLTAGE,
584                 .owner          = THIS_MODULE,
585         }, {
586                 .name           = "BUCK2",
587                 .id             = MAX8998_BUCK2,
588                 .ops            = &max8998_buck_ops,
589                 .type           = REGULATOR_VOLTAGE,
590                 .owner          = THIS_MODULE,
591         }, {
592                 .name           = "BUCK3",
593                 .id             = MAX8998_BUCK3,
594                 .ops            = &max8998_buck_ops,
595                 .type           = REGULATOR_VOLTAGE,
596                 .owner          = THIS_MODULE,
597         }, {
598                 .name           = "BUCK4",
599                 .id             = MAX8998_BUCK4,
600                 .ops            = &max8998_buck_ops,
601                 .type           = REGULATOR_VOLTAGE,
602                 .owner          = THIS_MODULE,
603         }, {
604                 .name           = "EN32KHz AP",
605                 .id             = MAX8998_EN32KHZ_AP,
606                 .ops            = &max8998_others_ops,
607                 .type           = REGULATOR_VOLTAGE,
608                 .owner          = THIS_MODULE,
609         }, {
610                 .name           = "EN32KHz CP",
611                 .id             = MAX8998_EN32KHZ_CP,
612                 .ops            = &max8998_others_ops,
613                 .type           = REGULATOR_VOLTAGE,
614                 .owner          = THIS_MODULE,
615         }, {
616                 .name           = "ENVICHG",
617                 .id             = MAX8998_ENVICHG,
618                 .ops            = &max8998_others_ops,
619                 .type           = REGULATOR_VOLTAGE,
620                 .owner          = THIS_MODULE,
621         }, {
622                 .name           = "ESAFEOUT1",
623                 .id             = MAX8998_ESAFEOUT1,
624                 .ops            = &max8998_others_ops,
625                 .type           = REGULATOR_VOLTAGE,
626                 .owner          = THIS_MODULE,
627         }, {
628                 .name           = "ESAFEOUT2",
629                 .id             = MAX8998_ESAFEOUT2,
630                 .ops            = &max8998_others_ops,
631                 .type           = REGULATOR_VOLTAGE,
632                 .owner          = THIS_MODULE,
633         }
634 };
635
636 static __devinit int max8998_pmic_probe(struct platform_device *pdev)
637 {
638         struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
639         struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
640         struct regulator_config config = { };
641         struct regulator_dev **rdev;
642         struct max8998_data *max8998;
643         struct i2c_client *i2c;
644         int i, ret, size;
645
646         if (!pdata) {
647                 dev_err(pdev->dev.parent, "No platform init data supplied\n");
648                 return -ENODEV;
649         }
650
651         max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_data),
652                                GFP_KERNEL);
653         if (!max8998)
654                 return -ENOMEM;
655
656         size = sizeof(struct regulator_dev *) * pdata->num_regulators;
657         max8998->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
658         if (!max8998->rdev)
659                 return -ENOMEM;
660
661         rdev = max8998->rdev;
662         max8998->dev = &pdev->dev;
663         max8998->iodev = iodev;
664         max8998->num_regulators = pdata->num_regulators;
665         platform_set_drvdata(pdev, max8998);
666         i2c = max8998->iodev->i2c;
667
668         max8998->buck1_idx = pdata->buck1_default_idx;
669         max8998->buck2_idx = pdata->buck2_default_idx;
670
671         /* NOTE: */
672         /* For unused GPIO NOT marked as -1 (thereof equal to 0)  WARN_ON */
673         /* will be displayed */
674
675         /* Check if MAX8998 voltage selection GPIOs are defined */
676         if (gpio_is_valid(pdata->buck1_set1) &&
677             gpio_is_valid(pdata->buck1_set2)) {
678                 /* Check if SET1 is not equal to 0 */
679                 if (!pdata->buck1_set1) {
680                         printk(KERN_ERR "MAX8998 SET1 GPIO defined as 0 !\n");
681                         WARN_ON(!pdata->buck1_set1);
682                         ret = -EIO;
683                         goto err_out;
684                 }
685                 /* Check if SET2 is not equal to 0 */
686                 if (!pdata->buck1_set2) {
687                         printk(KERN_ERR "MAX8998 SET2 GPIO defined as 0 !\n");
688                         WARN_ON(!pdata->buck1_set2);
689                         ret = -EIO;
690                         goto err_out;
691                 }
692
693                 gpio_request(pdata->buck1_set1, "MAX8998 BUCK1_SET1");
694                 gpio_direction_output(pdata->buck1_set1,
695                                       max8998->buck1_idx & 0x1);
696
697
698                 gpio_request(pdata->buck1_set2, "MAX8998 BUCK1_SET2");
699                 gpio_direction_output(pdata->buck1_set2,
700                                       (max8998->buck1_idx >> 1) & 0x1);
701                 /* Set predefined value for BUCK1 register 1 */
702                 i = 0;
703                 while (buck12_voltage_map_desc.min +
704                        buck12_voltage_map_desc.step*i
705                        < (pdata->buck1_voltage1 / 1000))
706                         i++;
707                 max8998->buck1_vol[0] = i;
708                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE1, i);
709                 if (ret)
710                         goto err_out;
711
712                 /* Set predefined value for BUCK1 register 2 */
713                 i = 0;
714                 while (buck12_voltage_map_desc.min +
715                        buck12_voltage_map_desc.step*i
716                        < (pdata->buck1_voltage2 / 1000))
717                         i++;
718
719                 max8998->buck1_vol[1] = i;
720                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE2, i);
721                 if (ret)
722                         goto err_out;
723
724                 /* Set predefined value for BUCK1 register 3 */
725                 i = 0;
726                 while (buck12_voltage_map_desc.min +
727                        buck12_voltage_map_desc.step*i
728                        < (pdata->buck1_voltage3 / 1000))
729                         i++;
730
731                 max8998->buck1_vol[2] = i;
732                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE3, i);
733                 if (ret)
734                         goto err_out;
735
736                 /* Set predefined value for BUCK1 register 4 */
737                 i = 0;
738                 while (buck12_voltage_map_desc.min +
739                        buck12_voltage_map_desc.step*i
740                        < (pdata->buck1_voltage4 / 1000))
741                         i++;
742
743                 max8998->buck1_vol[3] = i;
744                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE4, i);
745                 if (ret)
746                         goto err_out;
747
748         }
749
750         if (gpio_is_valid(pdata->buck2_set3)) {
751                 /* Check if SET3 is not equal to 0 */
752                 if (!pdata->buck2_set3) {
753                         printk(KERN_ERR "MAX8998 SET3 GPIO defined as 0 !\n");
754                         WARN_ON(!pdata->buck2_set3);
755                         ret = -EIO;
756                         goto err_out;
757                 }
758                 gpio_request(pdata->buck2_set3, "MAX8998 BUCK2_SET3");
759                 gpio_direction_output(pdata->buck2_set3,
760                                       max8998->buck2_idx & 0x1);
761
762                 /* BUCK2 register 1 */
763                 i = 0;
764                 while (buck12_voltage_map_desc.min +
765                        buck12_voltage_map_desc.step*i
766                        < (pdata->buck2_voltage1 / 1000))
767                         i++;
768                 max8998->buck2_vol[0] = i;
769                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK2_VOLTAGE1, i);
770                 if (ret)
771                         goto err_out;
772
773                 /* BUCK2 register 2 */
774                 i = 0;
775                 while (buck12_voltage_map_desc.min +
776                        buck12_voltage_map_desc.step*i
777                        < (pdata->buck2_voltage2 / 1000))
778                         i++;
779                 max8998->buck2_vol[1] = i;
780                 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK2_VOLTAGE2, i);
781                 if (ret)
782                         goto err_out;
783         }
784
785         for (i = 0; i < pdata->num_regulators; i++) {
786                 const struct voltage_map_desc *desc;
787                 int id = pdata->regulators[i].id;
788                 int index = id - MAX8998_LDO2;
789
790                 desc = ldo_voltage_map[id];
791                 if (desc && regulators[index].ops != &max8998_others_ops) {
792                         int count = (desc->max - desc->min) / desc->step + 1;
793
794                         regulators[index].n_voltages = count;
795                         regulators[index].min_uV = desc->min * 1000;
796                         regulators[index].uV_step = desc->step * 1000;
797                 }
798
799                 config.dev = max8998->dev;
800                 config.init_data = pdata->regulators[i].initdata;
801                 config.driver_data = max8998;
802
803                 rdev[i] = regulator_register(&regulators[index], &config);
804                 if (IS_ERR(rdev[i])) {
805                         ret = PTR_ERR(rdev[i]);
806                         dev_err(max8998->dev, "regulator init failed\n");
807                         rdev[i] = NULL;
808                         goto err;
809                 }
810         }
811
812
813         return 0;
814 err:
815         while (--i >= 0)
816                 regulator_unregister(rdev[i]);
817 err_out:
818         return ret;
819 }
820
821 static int __devexit max8998_pmic_remove(struct platform_device *pdev)
822 {
823         struct max8998_data *max8998 = platform_get_drvdata(pdev);
824         struct regulator_dev **rdev = max8998->rdev;
825         int i;
826
827         for (i = 0; i < max8998->num_regulators; i++)
828                 regulator_unregister(rdev[i]);
829         return 0;
830 }
831
832 static const struct platform_device_id max8998_pmic_id[] = {
833         { "max8998-pmic", TYPE_MAX8998 },
834         { "lp3974-pmic", TYPE_LP3974 },
835         { }
836 };
837 MODULE_DEVICE_TABLE(platform, max8998_pmic_id);
838
839 static struct platform_driver max8998_pmic_driver = {
840         .driver = {
841                 .name = "max8998-pmic",
842                 .owner = THIS_MODULE,
843         },
844         .probe = max8998_pmic_probe,
845         .remove = __devexit_p(max8998_pmic_remove),
846         .id_table = max8998_pmic_id,
847 };
848
849 static int __init max8998_pmic_init(void)
850 {
851         return platform_driver_register(&max8998_pmic_driver);
852 }
853 subsys_initcall(max8998_pmic_init);
854
855 static void __exit max8998_pmic_cleanup(void)
856 {
857         platform_driver_unregister(&max8998_pmic_driver);
858 }
859 module_exit(max8998_pmic_cleanup);
860
861 MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
862 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
863 MODULE_LICENSE("GPL");