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net: move procfs code to net/core/net-procfs.c
[linux/fpc-iii.git] / drivers / regulator / max8997.c
blob836908ce505e04277394622289826cee6a073b12
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");
Linux with added FPC-III support