regulator: max8997: remove useless code
[linux-2.6.git] / drivers / regulator / max8997.c
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/delay.h>
26 #include <linux/err.h>
27 #include <linux/gpio.h>
28 #include <linux/slab.h>
29 #include <linux/platform_device.h>
30 #include <linux/regulator/driver.h>
31 #include <linux/regulator/machine.h>
32 #include <linux/mfd/max8997.h>
33 #include <linux/mfd/max8997-private.h>
34
35 struct max8997_data {
36         struct device *dev;
37         struct max8997_dev *iodev;
38         int num_regulators;
39         struct regulator_dev **rdev;
40         int ramp_delay; /* in mV/us */
41
42         u8 buck1_vol[8];
43         u8 buck2_vol[8];
44         u8 buck5_vol[8];
45         int buck125_gpioindex;
46
47         u8 saved_states[MAX8997_REG_MAX];
48 };
49
50 static inline void max8997_set_gpio(struct max8997_data *max8997)
51 {
52         struct max8997_platform_data *pdata =
53                 dev_get_platdata(max8997->iodev->dev);
54         int set3 = (max8997->buck125_gpioindex) & 0x1;
55         int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
56         int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;
57
58         gpio_set_value(pdata->buck125_gpios[0], set1);
59         gpio_set_value(pdata->buck125_gpios[1], set2);
60         gpio_set_value(pdata->buck125_gpios[2], set3);
61 }
62
63 struct voltage_map_desc {
64         int min;
65         int max;
66         int step;
67         unsigned int n_bits;
68 };
69
70 /* Voltage maps in mV */
71 static const struct voltage_map_desc ldo_voltage_map_desc = {
72         .min = 800,     .max = 3950,    .step = 50,     .n_bits = 6,
73 }; /* LDO1 ~ 18, 21 all */
74
75 static const struct voltage_map_desc buck1245_voltage_map_desc = {
76         .min = 650,     .max = 2225,    .step = 25,     .n_bits = 6,
77 }; /* Buck1, 2, 4, 5 */
78
79 static const struct voltage_map_desc buck37_voltage_map_desc = {
80         .min = 750,     .max = 3900,    .step = 50,     .n_bits = 6,
81 }; /* Buck3, 7 */
82
83 /* current map in mA */
84 static const struct voltage_map_desc charger_current_map_desc = {
85         .min = 200,     .max = 950,     .step = 50,     .n_bits = 4,
86 };
87
88 static const struct voltage_map_desc topoff_current_map_desc = {
89         .min = 50,      .max = 200,     .step = 10,     .n_bits = 4,
90 };
91
92 static const struct voltage_map_desc *reg_voltage_map[] = {
93         [MAX8997_LDO1] = &ldo_voltage_map_desc,
94         [MAX8997_LDO2] = &ldo_voltage_map_desc,
95         [MAX8997_LDO3] = &ldo_voltage_map_desc,
96         [MAX8997_LDO4] = &ldo_voltage_map_desc,
97         [MAX8997_LDO5] = &ldo_voltage_map_desc,
98         [MAX8997_LDO6] = &ldo_voltage_map_desc,
99         [MAX8997_LDO7] = &ldo_voltage_map_desc,
100         [MAX8997_LDO8] = &ldo_voltage_map_desc,
101         [MAX8997_LDO9] = &ldo_voltage_map_desc,
102         [MAX8997_LDO10] = &ldo_voltage_map_desc,
103         [MAX8997_LDO11] = &ldo_voltage_map_desc,
104         [MAX8997_LDO12] = &ldo_voltage_map_desc,
105         [MAX8997_LDO13] = &ldo_voltage_map_desc,
106         [MAX8997_LDO14] = &ldo_voltage_map_desc,
107         [MAX8997_LDO15] = &ldo_voltage_map_desc,
108         [MAX8997_LDO16] = &ldo_voltage_map_desc,
109         [MAX8997_LDO17] = &ldo_voltage_map_desc,
110         [MAX8997_LDO18] = &ldo_voltage_map_desc,
111         [MAX8997_LDO21] = &ldo_voltage_map_desc,
112         [MAX8997_BUCK1] = &buck1245_voltage_map_desc,
113         [MAX8997_BUCK2] = &buck1245_voltage_map_desc,
114         [MAX8997_BUCK3] = &buck37_voltage_map_desc,
115         [MAX8997_BUCK4] = &buck1245_voltage_map_desc,
116         [MAX8997_BUCK5] = &buck1245_voltage_map_desc,
117         [MAX8997_BUCK6] = NULL,
118         [MAX8997_BUCK7] = &buck37_voltage_map_desc,
119         [MAX8997_EN32KHZ_AP] = NULL,
120         [MAX8997_EN32KHZ_CP] = NULL,
121         [MAX8997_ENVICHG] = NULL,
122         [MAX8997_ESAFEOUT1] = NULL,
123         [MAX8997_ESAFEOUT2] = NULL,
124         [MAX8997_CHARGER_CV] = NULL,
125         [MAX8997_CHARGER] = &charger_current_map_desc,
126         [MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc,
127 };
128
129 static inline int max8997_get_rid(struct regulator_dev *rdev)
130 {
131         return rdev_get_id(rdev);
132 }
133
134 static int max8997_list_voltage_safeout(struct regulator_dev *rdev,
135                 unsigned int selector)
136 {
137         int rid = max8997_get_rid(rdev);
138
139         if (rid == MAX8997_ESAFEOUT1 || rid == MAX8997_ESAFEOUT2) {
140                 switch (selector) {
141                 case 0:
142                         return 4850000;
143                 case 1:
144                         return 4900000;
145                 case 2:
146                         return 4950000;
147                 case 3:
148                         return 3300000;
149                 default:
150                         return -EINVAL;
151                 }
152         }
153
154         return -EINVAL;
155 }
156
157 static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev,
158                 unsigned int selector)
159 {
160         int rid = max8997_get_rid(rdev);
161
162         if (rid != MAX8997_CHARGER_CV)
163                 goto err;
164
165         switch (selector) {
166         case 0x00:
167                 return 4200000;
168         case 0x01 ... 0x0E:
169                 return 4000000 + 20000 * (selector - 0x01);
170         case 0x0F:
171                 return 4350000;
172         default:
173                 return -EINVAL;
174         }
175 err:
176         return -EINVAL;
177 }
178
179 static int max8997_list_voltage(struct regulator_dev *rdev,
180                 unsigned int selector)
181 {
182         const struct voltage_map_desc *desc;
183         int rid = max8997_get_rid(rdev);
184         int val;
185
186         if (rid >= ARRAY_SIZE(reg_voltage_map) ||
187                         rid < 0)
188                 return -EINVAL;
189
190         desc = reg_voltage_map[rid];
191         if (desc == NULL)
192                 return -EINVAL;
193
194         val = desc->min + desc->step * selector;
195         if (val > desc->max)
196                 return -EINVAL;
197
198         return val * 1000;
199 }
200
201 static int max8997_get_enable_register(struct regulator_dev *rdev,
202                 int *reg, int *mask, int *pattern)
203 {
204         int rid = max8997_get_rid(rdev);
205
206         switch (rid) {
207         case MAX8997_LDO1 ... MAX8997_LDO21:
208                 *reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
209                 *mask = 0xC0;
210                 *pattern = 0xC0;
211                 break;
212         case MAX8997_BUCK1:
213                 *reg = MAX8997_REG_BUCK1CTRL;
214                 *mask = 0x01;
215                 *pattern = 0x01;
216                 break;
217         case MAX8997_BUCK2:
218                 *reg = MAX8997_REG_BUCK2CTRL;
219                 *mask = 0x01;
220                 *pattern = 0x01;
221                 break;
222         case MAX8997_BUCK3:
223                 *reg = MAX8997_REG_BUCK3CTRL;
224                 *mask = 0x01;
225                 *pattern = 0x01;
226                 break;
227         case MAX8997_BUCK4:
228                 *reg = MAX8997_REG_BUCK4CTRL;
229                 *mask = 0x01;
230                 *pattern = 0x01;
231                 break;
232         case MAX8997_BUCK5:
233                 *reg = MAX8997_REG_BUCK5CTRL;
234                 *mask = 0x01;
235                 *pattern = 0x01;
236                 break;
237         case MAX8997_BUCK6:
238                 *reg = MAX8997_REG_BUCK6CTRL;
239                 *mask = 0x01;
240                 *pattern = 0x01;
241                 break;
242         case MAX8997_BUCK7:
243                 *reg = MAX8997_REG_BUCK7CTRL;
244                 *mask = 0x01;
245                 *pattern = 0x01;
246                 break;
247         case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP:
248                 *reg = MAX8997_REG_MAINCON1;
249                 *mask = 0x01 << (rid - MAX8997_EN32KHZ_AP);
250                 *pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP);
251                 break;
252         case MAX8997_ENVICHG:
253                 *reg = MAX8997_REG_MBCCTRL1;
254                 *mask = 0x80;
255                 *pattern = 0x80;
256                 break;
257         case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
258                 *reg = MAX8997_REG_SAFEOUTCTRL;
259                 *mask = 0x40 << (rid - MAX8997_ESAFEOUT1);
260                 *pattern = 0x40 << (rid - MAX8997_ESAFEOUT1);
261                 break;
262         case MAX8997_CHARGER:
263                 *reg = MAX8997_REG_MBCCTRL2;
264                 *mask = 0x40;
265                 *pattern = 0x40;
266                 break;
267         default:
268                 /* Not controllable or not exists */
269                 return -EINVAL;
270         }
271
272         return 0;
273 }
274
275 static int max8997_reg_is_enabled(struct regulator_dev *rdev)
276 {
277         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
278         struct i2c_client *i2c = max8997->iodev->i2c;
279         int ret, reg, mask, pattern;
280         u8 val;
281
282         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
283         if (ret == -EINVAL)
284                 return 1; /* "not controllable" */
285         else if (ret)
286                 return ret;
287
288         ret = max8997_read_reg(i2c, reg, &val);
289         if (ret)
290                 return ret;
291
292         return (val & mask) == pattern;
293 }
294
295 static int max8997_reg_enable(struct regulator_dev *rdev)
296 {
297         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
298         struct i2c_client *i2c = max8997->iodev->i2c;
299         int ret, reg, mask, pattern;
300
301         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
302         if (ret)
303                 return ret;
304
305         return max8997_update_reg(i2c, reg, pattern, mask);
306 }
307
308 static int max8997_reg_disable(struct regulator_dev *rdev)
309 {
310         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
311         struct i2c_client *i2c = max8997->iodev->i2c;
312         int ret, reg, mask, pattern;
313
314         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
315         if (ret)
316                 return ret;
317
318         return max8997_update_reg(i2c, reg, ~pattern, mask);
319 }
320
321 static int max8997_get_voltage_register(struct regulator_dev *rdev,
322                 int *_reg, int *_shift, int *_mask)
323 {
324         int rid = max8997_get_rid(rdev);
325         int reg, shift = 0, mask = 0x3f;
326
327         switch (rid) {
328         case MAX8997_LDO1 ... MAX8997_LDO21:
329                 reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
330                 break;
331         case MAX8997_BUCK1:
332                 reg = MAX8997_REG_BUCK1DVS1;
333                 break;
334         case MAX8997_BUCK2:
335                 reg = MAX8997_REG_BUCK2DVS1;
336                 break;
337         case MAX8997_BUCK3:
338                 reg = MAX8997_REG_BUCK3DVS;
339                 break;
340         case MAX8997_BUCK4:
341                 reg = MAX8997_REG_BUCK4DVS;
342                 break;
343         case MAX8997_BUCK5:
344                 reg = MAX8997_REG_BUCK5DVS1;
345                 break;
346         case MAX8997_BUCK7:
347                 reg = MAX8997_REG_BUCK7DVS;
348                 break;
349         case MAX8997_ESAFEOUT1 ...  MAX8997_ESAFEOUT2:
350                 reg = MAX8997_REG_SAFEOUTCTRL;
351                 shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0;
352                 mask = 0x3;
353                 break;
354         case MAX8997_CHARGER_CV:
355                 reg = MAX8997_REG_MBCCTRL3;
356                 shift = 0;
357                 mask = 0xf;
358                 break;
359         case MAX8997_CHARGER:
360                 reg = MAX8997_REG_MBCCTRL4;
361                 shift = 0;
362                 mask = 0xf;
363                 break;
364         case MAX8997_CHARGER_TOPOFF:
365                 reg = MAX8997_REG_MBCCTRL5;
366                 shift = 0;
367                 mask = 0xf;
368                 break;
369         default:
370                 return -EINVAL;
371         }
372
373         *_reg = reg;
374         *_shift = shift;
375         *_mask = mask;
376
377         return 0;
378 }
379
380 static int max8997_get_voltage(struct regulator_dev *rdev)
381 {
382         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
383         struct max8997_platform_data *pdata =
384                 dev_get_platdata(max8997->iodev->dev);
385         struct i2c_client *i2c = max8997->iodev->i2c;
386         int reg, shift, mask, ret;
387         int rid = max8997_get_rid(rdev);
388         u8 val;
389
390         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
391         if (ret)
392                 return ret;
393
394         if ((rid == MAX8997_BUCK1 && pdata->buck1_gpiodvs) ||
395                         (rid == MAX8997_BUCK2 && pdata->buck2_gpiodvs) ||
396                         (rid == MAX8997_BUCK5 && pdata->buck5_gpiodvs))
397                 reg += max8997->buck125_gpioindex;
398
399         ret = max8997_read_reg(i2c, reg, &val);
400         if (ret)
401                 return ret;
402
403         val >>= shift;
404         val &= mask;
405
406         if (rdev->desc && rdev->desc->ops && rdev->desc->ops->list_voltage)
407                 return rdev->desc->ops->list_voltage(rdev, val);
408
409         /*
410          * max8997_list_voltage returns value for any rdev with voltage_map,
411          * which works for "CHARGER" and "CHARGER TOPOFF" that do not have
412          * list_voltage ops (they are current regulators).
413          */
414         return max8997_list_voltage(rdev, val);
415 }
416
417 static inline int max8997_get_voltage_proper_val(
418                 const struct voltage_map_desc *desc,
419                 int min_vol, int max_vol)
420 {
421         int i = 0;
422
423         if (desc == NULL)
424                 return -EINVAL;
425
426         if (max_vol < desc->min || min_vol > desc->max)
427                 return -EINVAL;
428
429         while (desc->min + desc->step * i < min_vol &&
430                         desc->min + desc->step * i < desc->max)
431                 i++;
432
433         if (desc->min + desc->step * i > max_vol)
434                 return -EINVAL;
435
436         if (i >= (1 << desc->n_bits))
437                 return -EINVAL;
438
439         return i;
440 }
441
442 static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev,
443                 int min_uV, int max_uV, unsigned *selector)
444 {
445         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
446         struct i2c_client *i2c = max8997->iodev->i2c;
447         int rid = max8997_get_rid(rdev);
448         int lb, ub;
449         int reg, shift = 0, mask, ret = 0;
450         u8 val = 0x0;
451
452         if (rid != MAX8997_CHARGER_CV)
453                 return -EINVAL;
454
455         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
456         if (ret)
457                 return ret;
458
459         if (max_uV < 4000000 || min_uV > 4350000)
460                 return -EINVAL;
461
462         if (min_uV <= 4000000) {
463                 if (max_uV >= 4000000)
464                         return -EINVAL;
465                 else
466                         val = 0x1;
467         } else if (min_uV <= 4200000 && max_uV >= 4200000)
468                 val = 0x0;
469         else {
470                 lb = (min_uV - 4000001) / 20000 + 2;
471                 ub = (max_uV - 4000000) / 20000 + 1;
472
473                 if (lb > ub)
474                         return -EINVAL;
475
476                 if (lb < 0xf)
477                         val = lb;
478                 else {
479                         if (ub >= 0xf)
480                                 val = 0xf;
481                         else
482                                 return -EINVAL;
483                 }
484         }
485
486         *selector = val;
487
488         ret = max8997_update_reg(i2c, reg, val << shift, mask);
489
490         return ret;
491 }
492
493 /*
494  * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
495  * BUCK1, 2, and 5 are available if they are not controlled by gpio
496  */
497 static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
498                 int min_uV, int max_uV, unsigned *selector)
499 {
500         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
501         struct i2c_client *i2c = max8997->iodev->i2c;
502         int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
503         const struct voltage_map_desc *desc;
504         int rid = max8997_get_rid(rdev);
505         int reg, shift = 0, mask, ret;
506         int i;
507         u8 org;
508
509         switch (rid) {
510         case MAX8997_LDO1 ... MAX8997_LDO21:
511                 break;
512         case MAX8997_BUCK1 ... MAX8997_BUCK5:
513                 break;
514         case MAX8997_BUCK6:
515                 return -EINVAL;
516         case MAX8997_BUCK7:
517                 break;
518         case MAX8997_CHARGER:
519                 break;
520         case MAX8997_CHARGER_TOPOFF:
521                 break;
522         default:
523                 return -EINVAL;
524         }
525
526         desc = reg_voltage_map[rid];
527
528         i = max8997_get_voltage_proper_val(desc, min_vol, max_vol);
529         if (i < 0)
530                 return i;
531
532         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
533         if (ret)
534                 return ret;
535
536         max8997_read_reg(i2c, reg, &org);
537         org = (org & mask) >> shift;
538
539         ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
540         *selector = i;
541
542         if (rid == MAX8997_BUCK1 || rid == MAX8997_BUCK2 ||
543                         rid == MAX8997_BUCK4 || rid == MAX8997_BUCK5) {
544                 /* If the voltage is increasing */
545                 if (org < i)
546                         udelay(desc->step * (i - org) / max8997->ramp_delay);
547         }
548
549         return ret;
550 }
551
552 /*
553  * Assess the damage on the voltage setting of BUCK1,2,5 by the change.
554  *
555  * When GPIO-DVS mode is used for multiple bucks, changing the voltage value
556  * of one of the bucks may affect that of another buck, which is the side
557  * effect of the change (set_voltage). This function examines the GPIO-DVS
558  * configurations and checks whether such side-effect exists.
559  */
560 static int max8997_assess_side_effect(struct regulator_dev *rdev,
561                 u8 new_val, int *best)
562 {
563         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
564         struct max8997_platform_data *pdata =
565                 dev_get_platdata(max8997->iodev->dev);
566         int rid = max8997_get_rid(rdev);
567         u8 *buckx_val[3];
568         bool buckx_gpiodvs[3];
569         int side_effect[8];
570         int min_side_effect = INT_MAX;
571         int i;
572
573         *best = -1;
574
575         switch (rid) {
576         case MAX8997_BUCK1:
577                 rid = 0;
578                 break;
579         case MAX8997_BUCK2:
580                 rid = 1;
581                 break;
582         case MAX8997_BUCK5:
583                 rid = 2;
584                 break;
585         default:
586                 return -EINVAL;
587         }
588
589         buckx_val[0] = max8997->buck1_vol;
590         buckx_val[1] = max8997->buck2_vol;
591         buckx_val[2] = max8997->buck5_vol;
592         buckx_gpiodvs[0] = pdata->buck1_gpiodvs;
593         buckx_gpiodvs[1] = pdata->buck2_gpiodvs;
594         buckx_gpiodvs[2] = pdata->buck5_gpiodvs;
595
596         for (i = 0; i < 8; i++) {
597                 int others;
598
599                 if (new_val != (buckx_val[rid])[i]) {
600                         side_effect[i] = -1;
601                         continue;
602                 }
603
604                 side_effect[i] = 0;
605                 for (others = 0; others < 3; others++) {
606                         int diff;
607
608                         if (others == rid)
609                                 continue;
610                         if (buckx_gpiodvs[others] == false)
611                                 continue; /* Not affected */
612                         diff = (buckx_val[others])[i] -
613                                 (buckx_val[others])[max8997->buck125_gpioindex];
614                         if (diff > 0)
615                                 side_effect[i] += diff;
616                         else if (diff < 0)
617                                 side_effect[i] -= diff;
618                 }
619                 if (side_effect[i] == 0) {
620                         *best = i;
621                         return 0; /* NO SIDE EFFECT! Use This! */
622                 }
623                 if (side_effect[i] < min_side_effect) {
624                         min_side_effect = side_effect[i];
625                         *best = i;
626                 }
627         }
628
629         if (*best == -1)
630                 return -EINVAL;
631
632         return side_effect[*best];
633 }
634
635 /*
636  * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
637  * max8997_set_voltage_ldobuck to do the job.
638  */
639 static int max8997_set_voltage_buck(struct regulator_dev *rdev,
640                 int min_uV, int max_uV, unsigned *selector)
641 {
642         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
643         struct max8997_platform_data *pdata =
644                 dev_get_platdata(max8997->iodev->dev);
645         int rid = max8997_get_rid(rdev);
646         const struct voltage_map_desc *desc;
647         int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
648         bool gpio_dvs_mode = false;
649         int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
650
651         if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
652                 return -EINVAL;
653
654         switch (rid) {
655         case MAX8997_BUCK1:
656                 if (pdata->buck1_gpiodvs)
657                         gpio_dvs_mode = true;
658                 break;
659         case MAX8997_BUCK2:
660                 if (pdata->buck2_gpiodvs)
661                         gpio_dvs_mode = true;
662                 break;
663         case MAX8997_BUCK5:
664                 if (pdata->buck5_gpiodvs)
665                         gpio_dvs_mode = true;
666                 break;
667         }
668
669         if (!gpio_dvs_mode)
670                 return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV,
671                                                 selector);
672
673         desc = reg_voltage_map[rid];
674         new_val = max8997_get_voltage_proper_val(desc, min_vol, max_vol);
675         if (new_val < 0)
676                 return new_val;
677
678         tmp_dmg = INT_MAX;
679         tmp_idx = -1;
680         tmp_val = -1;
681         do {
682                 damage = max8997_assess_side_effect(rdev, new_val, &new_idx);
683                 if (damage == 0)
684                         goto out;
685
686                 if (tmp_dmg > damage) {
687                         tmp_idx = new_idx;
688                         tmp_val = new_val;
689                         tmp_dmg = damage;
690                 }
691
692                 new_val++;
693         } while (desc->min + desc->step + new_val <= desc->max);
694
695         new_idx = tmp_idx;
696         new_val = tmp_val;
697
698         if (pdata->ignore_gpiodvs_side_effect == false)
699                 return -EINVAL;
700
701         dev_warn(&rdev->dev, "MAX8997 GPIO-DVS Side Effect Warning: GPIO SET:"
702                         " %d -> %d\n", max8997->buck125_gpioindex, tmp_idx);
703
704 out:
705         if (new_idx < 0 || new_val < 0)
706                 return -EINVAL;
707
708         max8997->buck125_gpioindex = new_idx;
709         max8997_set_gpio(max8997);
710         *selector = new_val;
711
712         return 0;
713 }
714
715 static const int safeoutvolt[] = {
716         3300000,
717         4850000,
718         4900000,
719         4950000,
720 };
721
722 /* For SAFEOUT1 and SAFEOUT2 */
723 static int max8997_set_voltage_safeout(struct regulator_dev *rdev,
724                 int min_uV, int max_uV, unsigned *selector)
725 {
726         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
727         struct i2c_client *i2c = max8997->iodev->i2c;
728         int rid = max8997_get_rid(rdev);
729         int reg, shift = 0, mask, ret;
730         int i = 0;
731         u8 val;
732
733         if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2)
734                 return -EINVAL;
735
736         for (i = 0; i < ARRAY_SIZE(safeoutvolt); i++) {
737                 if (min_uV <= safeoutvolt[i] &&
738                                 max_uV >= safeoutvolt[i])
739                         break;
740         }
741
742         if (i >= ARRAY_SIZE(safeoutvolt))
743                 return -EINVAL;
744
745         if (i == 0)
746                 val = 0x3;
747         else
748                 val = i - 1;
749
750         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
751         if (ret)
752                 return ret;
753
754         ret = max8997_update_reg(i2c, reg, val << shift, mask << shift);
755         *selector = val;
756
757         return ret;
758 }
759
760 static int max8997_reg_enable_suspend(struct regulator_dev *rdev)
761 {
762         return 0;
763 }
764
765 static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
766 {
767         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
768         struct i2c_client *i2c = max8997->iodev->i2c;
769         int ret, reg, mask, pattern;
770         int rid = max8997_get_rid(rdev);
771
772         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
773         if (ret)
774                 return ret;
775
776         max8997_read_reg(i2c, reg, &max8997->saved_states[rid]);
777
778         if (rid == MAX8997_LDO1 ||
779                         rid == MAX8997_LDO10 ||
780                         rid == MAX8997_LDO21) {
781                 dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n",
782                                 rdev->desc->name);
783                 return max8997_update_reg(i2c, reg, 0x40, mask);
784         }
785
786         dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
787                         rdev->desc->name, max8997->saved_states[rid] & mask,
788                         (~pattern) & mask);
789         return max8997_update_reg(i2c, reg, ~pattern, mask);
790 }
791
792 static struct regulator_ops max8997_ldo_ops = {
793         .list_voltage           = max8997_list_voltage,
794         .is_enabled             = max8997_reg_is_enabled,
795         .enable                 = max8997_reg_enable,
796         .disable                = max8997_reg_disable,
797         .get_voltage            = max8997_get_voltage,
798         .set_voltage            = max8997_set_voltage_ldobuck,
799         .set_suspend_enable     = max8997_reg_enable_suspend,
800         .set_suspend_disable    = max8997_reg_disable_suspend,
801 };
802
803 static struct regulator_ops max8997_buck_ops = {
804         .list_voltage           = max8997_list_voltage,
805         .is_enabled             = max8997_reg_is_enabled,
806         .enable                 = max8997_reg_enable,
807         .disable                = max8997_reg_disable,
808         .get_voltage            = max8997_get_voltage,
809         .set_voltage            = max8997_set_voltage_buck,
810         .set_suspend_enable     = max8997_reg_enable_suspend,
811         .set_suspend_disable    = max8997_reg_disable_suspend,
812 };
813
814 static struct regulator_ops max8997_fixedvolt_ops = {
815         .list_voltage           = max8997_list_voltage,
816         .is_enabled             = max8997_reg_is_enabled,
817         .enable                 = max8997_reg_enable,
818         .disable                = max8997_reg_disable,
819         .set_suspend_enable     = max8997_reg_enable_suspend,
820         .set_suspend_disable    = max8997_reg_disable_suspend,
821 };
822
823 static struct regulator_ops max8997_safeout_ops = {
824         .list_voltage           = max8997_list_voltage_safeout,
825         .is_enabled             = max8997_reg_is_enabled,
826         .enable                 = max8997_reg_enable,
827         .disable                = max8997_reg_disable,
828         .get_voltage            = max8997_get_voltage,
829         .set_voltage            = max8997_set_voltage_safeout,
830         .set_suspend_enable     = max8997_reg_enable_suspend,
831         .set_suspend_disable    = max8997_reg_disable_suspend,
832 };
833
834 static struct regulator_ops max8997_fixedstate_ops = {
835         .list_voltage           = max8997_list_voltage_charger_cv,
836         .get_voltage            = max8997_get_voltage,
837         .set_voltage            = max8997_set_voltage_charger_cv,
838 };
839
840 static int max8997_set_voltage_ldobuck_wrap(struct regulator_dev *rdev,
841                 int min_uV, int max_uV)
842 {
843         unsigned dummy;
844
845         return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV, &dummy);
846 }
847
848
849 static struct regulator_ops max8997_charger_ops = {
850         .is_enabled             = max8997_reg_is_enabled,
851         .enable                 = max8997_reg_enable,
852         .disable                = max8997_reg_disable,
853         .get_current_limit      = max8997_get_voltage,
854         .set_current_limit      = max8997_set_voltage_ldobuck_wrap,
855 };
856
857 static struct regulator_ops max8997_charger_fixedstate_ops = {
858         .is_enabled             = max8997_reg_is_enabled,
859         .get_current_limit      = max8997_get_voltage,
860         .set_current_limit      = max8997_set_voltage_ldobuck_wrap,
861 };
862
863 #define regulator_desc_ldo(num)         {       \
864         .name           = "LDO"#num,            \
865         .id             = MAX8997_LDO##num,     \
866         .ops            = &max8997_ldo_ops,     \
867         .type           = REGULATOR_VOLTAGE,    \
868         .owner          = THIS_MODULE,          \
869 }
870 #define regulator_desc_buck(num)                {       \
871         .name           = "BUCK"#num,           \
872         .id             = MAX8997_BUCK##num,    \
873         .ops            = &max8997_buck_ops,    \
874         .type           = REGULATOR_VOLTAGE,    \
875         .owner          = THIS_MODULE,          \
876 }
877
878 static struct regulator_desc regulators[] = {
879         regulator_desc_ldo(1),
880         regulator_desc_ldo(2),
881         regulator_desc_ldo(3),
882         regulator_desc_ldo(4),
883         regulator_desc_ldo(5),
884         regulator_desc_ldo(6),
885         regulator_desc_ldo(7),
886         regulator_desc_ldo(8),
887         regulator_desc_ldo(9),
888         regulator_desc_ldo(10),
889         regulator_desc_ldo(11),
890         regulator_desc_ldo(12),
891         regulator_desc_ldo(13),
892         regulator_desc_ldo(14),
893         regulator_desc_ldo(15),
894         regulator_desc_ldo(16),
895         regulator_desc_ldo(17),
896         regulator_desc_ldo(18),
897         regulator_desc_ldo(21),
898         regulator_desc_buck(1),
899         regulator_desc_buck(2),
900         regulator_desc_buck(3),
901         regulator_desc_buck(4),
902         regulator_desc_buck(5),
903         {
904                 .name   = "BUCK6",
905                 .id     = MAX8997_BUCK6,
906                 .ops    = &max8997_fixedvolt_ops,
907                 .type   = REGULATOR_VOLTAGE,
908                 .owner  = THIS_MODULE,
909         },
910         regulator_desc_buck(7),
911         {
912                 .name   = "EN32KHz AP",
913                 .id     = MAX8997_EN32KHZ_AP,
914                 .ops    = &max8997_fixedvolt_ops,
915                 .type   = REGULATOR_VOLTAGE,
916                 .owner  = THIS_MODULE,
917         }, {
918                 .name   = "EN32KHz CP",
919                 .id     = MAX8997_EN32KHZ_CP,
920                 .ops    = &max8997_fixedvolt_ops,
921                 .type   = REGULATOR_VOLTAGE,
922                 .owner  = THIS_MODULE,
923         }, {
924                 .name   = "ENVICHG",
925                 .id     = MAX8997_ENVICHG,
926                 .ops    = &max8997_fixedvolt_ops,
927                 .type   = REGULATOR_VOLTAGE,
928                 .owner  = THIS_MODULE,
929         }, {
930                 .name   = "ESAFEOUT1",
931                 .id     = MAX8997_ESAFEOUT1,
932                 .ops    = &max8997_safeout_ops,
933                 .type   = REGULATOR_VOLTAGE,
934                 .owner   = THIS_MODULE,
935         }, {
936                 .name   = "ESAFEOUT2",
937                 .id     = MAX8997_ESAFEOUT2,
938                 .ops    = &max8997_safeout_ops,
939                 .type   = REGULATOR_VOLTAGE,
940                 .owner   = THIS_MODULE,
941         }, {
942                 .name   = "CHARGER CV",
943                 .id     = MAX8997_CHARGER_CV,
944                 .ops    = &max8997_fixedstate_ops,
945                 .type   = REGULATOR_VOLTAGE,
946                 .owner   = THIS_MODULE,
947         }, {
948                 .name   = "CHARGER",
949                 .id     = MAX8997_CHARGER,
950                 .ops    = &max8997_charger_ops,
951                 .type   = REGULATOR_CURRENT,
952                 .owner   = THIS_MODULE,
953         }, {
954                 .name   = "CHARGER TOPOFF",
955                 .id     = MAX8997_CHARGER_TOPOFF,
956                 .ops    = &max8997_charger_fixedstate_ops,
957                 .type   = REGULATOR_CURRENT,
958                 .owner   = THIS_MODULE,
959         },
960 };
961
962 static __devinit int max8997_pmic_probe(struct platform_device *pdev)
963 {
964         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
965         struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
966         struct regulator_dev **rdev;
967         struct max8997_data *max8997;
968         struct i2c_client *i2c;
969         int i, ret, size;
970         u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
971
972         if (!pdata) {
973                 dev_err(pdev->dev.parent, "No platform init data supplied.\n");
974                 return -ENODEV;
975         }
976
977         max8997 = kzalloc(sizeof(struct max8997_data), GFP_KERNEL);
978         if (!max8997)
979                 return -ENOMEM;
980
981         size = sizeof(struct regulator_dev *) * pdata->num_regulators;
982         max8997->rdev = kzalloc(size, GFP_KERNEL);
983         if (!max8997->rdev) {
984                 kfree(max8997);
985                 return -ENOMEM;
986         }
987
988         rdev = max8997->rdev;
989         max8997->dev = &pdev->dev;
990         max8997->iodev = iodev;
991         max8997->num_regulators = pdata->num_regulators;
992         platform_set_drvdata(pdev, max8997);
993         i2c = max8997->iodev->i2c;
994
995         max8997->buck125_gpioindex = pdata->buck125_default_idx;
996
997         for (i = 0; i < 8; i++) {
998                 max8997->buck1_vol[i] = ret =
999                         max8997_get_voltage_proper_val(
1000                                         &buck1245_voltage_map_desc,
1001                                         pdata->buck1_voltage[i] / 1000,
1002                                         pdata->buck1_voltage[i] / 1000 +
1003                                         buck1245_voltage_map_desc.step);
1004                 if (ret < 0)
1005                         goto err_alloc;
1006
1007                 max8997->buck2_vol[i] = ret =
1008                         max8997_get_voltage_proper_val(
1009                                         &buck1245_voltage_map_desc,
1010                                         pdata->buck2_voltage[i] / 1000,
1011                                         pdata->buck2_voltage[i] / 1000 +
1012                                         buck1245_voltage_map_desc.step);
1013                 if (ret < 0)
1014                         goto err_alloc;
1015
1016                 max8997->buck5_vol[i] = ret =
1017                         max8997_get_voltage_proper_val(
1018                                         &buck1245_voltage_map_desc,
1019                                         pdata->buck5_voltage[i] / 1000,
1020                                         pdata->buck5_voltage[i] / 1000 +
1021                                         buck1245_voltage_map_desc.step);
1022                 if (ret < 0)
1023                         goto err_alloc;
1024
1025                 if (max_buck1 < max8997->buck1_vol[i])
1026                         max_buck1 = max8997->buck1_vol[i];
1027                 if (max_buck2 < max8997->buck2_vol[i])
1028                         max_buck2 = max8997->buck2_vol[i];
1029                 if (max_buck5 < max8997->buck5_vol[i])
1030                         max_buck5 = max8997->buck5_vol[i];
1031         }
1032
1033         /* For the safety, set max voltage before setting up */
1034         for (i = 0; i < 8; i++) {
1035                 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS(i + 1),
1036                                 max_buck1, 0x3f);
1037                 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS(i + 1),
1038                                 max_buck2, 0x3f);
1039                 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS(i + 1),
1040                                 max_buck5, 0x3f);
1041         }
1042
1043         /*
1044          * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them.
1045          * If at least one of them cares, set gpios.
1046          */
1047         if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1048                         pdata->buck5_gpiodvs) {
1049                 bool gpio1set = false, gpio2set = false;
1050
1051                 if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
1052                                 !gpio_is_valid(pdata->buck125_gpios[1]) ||
1053                                 !gpio_is_valid(pdata->buck125_gpios[2])) {
1054                         dev_err(&pdev->dev, "GPIO NOT VALID\n");
1055                         ret = -EINVAL;
1056                         goto err_alloc;
1057                 }
1058
1059                 ret = gpio_request(pdata->buck125_gpios[0],
1060                                 "MAX8997 SET1");
1061                 if (ret == -EBUSY)
1062                         dev_warn(&pdev->dev, "Duplicated gpio request"
1063                                         " on SET1\n");
1064                 else if (ret)
1065                         goto err_alloc;
1066                 else
1067                         gpio1set = true;
1068
1069                 ret = gpio_request(pdata->buck125_gpios[1],
1070                                 "MAX8997 SET2");
1071                 if (ret == -EBUSY)
1072                         dev_warn(&pdev->dev, "Duplicated gpio request"
1073                                         " on SET2\n");
1074                 else if (ret) {
1075                         if (gpio1set)
1076                                 gpio_free(pdata->buck125_gpios[0]);
1077                         goto err_alloc;
1078                 } else
1079                         gpio2set = true;
1080
1081                 ret = gpio_request(pdata->buck125_gpios[2],
1082                                 "MAX8997 SET3");
1083                 if (ret == -EBUSY)
1084                         dev_warn(&pdev->dev, "Duplicated gpio request"
1085                                         " on SET3\n");
1086                 else if (ret) {
1087                         if (gpio1set)
1088                                 gpio_free(pdata->buck125_gpios[0]);
1089                         if (gpio2set)
1090                                 gpio_free(pdata->buck125_gpios[1]);
1091                         goto err_alloc;
1092                 }
1093
1094                 gpio_direction_output(pdata->buck125_gpios[0],
1095                                 (max8997->buck125_gpioindex >> 2)
1096                                 & 0x1); /* SET1 */
1097                 gpio_direction_output(pdata->buck125_gpios[1],
1098                                 (max8997->buck125_gpioindex >> 1)
1099                                 & 0x1); /* SET2 */
1100                 gpio_direction_output(pdata->buck125_gpios[2],
1101                                 (max8997->buck125_gpioindex >> 0)
1102                                 & 0x1); /* SET3 */
1103                 ret = 0;
1104         }
1105
1106         /* DVS-GPIO disabled */
1107         max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ?
1108                         (1 << 1) : (0 << 1), 1 << 1);
1109         max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ?
1110                         (1 << 1) : (0 << 1), 1 << 1);
1111         max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ?
1112                         (1 << 1) : (0 << 1), 1 << 1);
1113
1114         /* Initialize all the DVS related BUCK registers */
1115         for (i = 0; i < 8; i++) {
1116                 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS(i + 1),
1117                                 max8997->buck1_vol[i],
1118                                 0x3f);
1119                 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS(i + 1),
1120                                 max8997->buck2_vol[i],
1121                                 0x3f);
1122                 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS(i + 1),
1123                                 max8997->buck5_vol[i],
1124                                 0x3f);
1125         }
1126
1127         for (i = 0; i < pdata->num_regulators; i++) {
1128                 const struct voltage_map_desc *desc;
1129                 int id = pdata->regulators[i].id;
1130
1131                 desc = reg_voltage_map[id];
1132                 if (desc)
1133                         regulators[id].n_voltages =
1134                                 (desc->max - desc->min) / desc->step + 1;
1135                 else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2)
1136                         regulators[id].n_voltages = 4;
1137                 else if (id == MAX8997_CHARGER_CV)
1138                         regulators[id].n_voltages = 16;
1139
1140                 rdev[i] = regulator_register(&regulators[id], max8997->dev,
1141                                 pdata->regulators[i].initdata, max8997);
1142                 if (IS_ERR(rdev[i])) {
1143                         ret = PTR_ERR(rdev[i]);
1144                         dev_err(max8997->dev, "regulator init failed for %d\n",
1145                                         id);
1146                         rdev[i] = NULL;
1147                         goto err;
1148                 }
1149         }
1150
1151         /* Misc Settings */
1152         max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
1153         max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
1154
1155         return 0;
1156 err:
1157         for (i = 0; i < max8997->num_regulators; i++)
1158                 if (rdev[i])
1159                         regulator_unregister(rdev[i]);
1160 err_alloc:
1161         kfree(max8997->rdev);
1162         kfree(max8997);
1163
1164         return ret;
1165 }
1166
1167 static int __devexit max8997_pmic_remove(struct platform_device *pdev)
1168 {
1169         struct max8997_data *max8997 = platform_get_drvdata(pdev);
1170         struct regulator_dev **rdev = max8997->rdev;
1171         int i;
1172
1173         for (i = 0; i < max8997->num_regulators; i++)
1174                 if (rdev[i])
1175                         regulator_unregister(rdev[i]);
1176
1177         kfree(max8997->rdev);
1178         kfree(max8997);
1179
1180         return 0;
1181 }
1182
1183 static const struct platform_device_id max8997_pmic_id[] = {
1184         { "max8997-pmic", 0},
1185         { },
1186 };
1187 MODULE_DEVICE_TABLE(platform, max8997_pmic_id);
1188
1189 static struct platform_driver max8997_pmic_driver = {
1190         .driver = {
1191                 .name = "max8997-pmic",
1192                 .owner = THIS_MODULE,
1193         },
1194         .probe = max8997_pmic_probe,
1195         .remove = __devexit_p(max8997_pmic_remove),
1196         .id_table = max8997_pmic_id,
1197 };
1198
1199 static int __init max8997_pmic_init(void)
1200 {
1201         return platform_driver_register(&max8997_pmic_driver);
1202 }
1203 subsys_initcall(max8997_pmic_init);
1204
1205 static void __exit max8997_pmic_cleanup(void)
1206 {
1207         platform_driver_unregister(&max8997_pmic_driver);
1208 }
1209 module_exit(max8997_pmic_cleanup);
1210
1211 MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver");
1212 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1213 MODULE_LICENSE("GPL");