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1/*
2 * max8997.c - Regulator driver for the Maxim 8997/8966
3 *
4 * Copyright (C) 2011 Samsung Electronics
5 * MyungJoo Ham <myungjoo.ham@smasung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * This driver is based on max8998.c
22 */
23
24#include <linux/bug.h>
25#include <linux/err.h>
26#include <linux/gpio.h>
27#include <linux/of_gpio.h>
28#include <linux/slab.h>
29#include <linux/module.h>
30#include <linux/platform_device.h>
31#include <linux/regulator/driver.h>
32#include <linux/regulator/machine.h>
33#include <linux/mfd/max8997.h>
34#include <linux/mfd/max8997-private.h>
35#include <linux/regulator/of_regulator.h>
36
37struct 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
57static const unsigned int safeoutvolt[] = {
58 4850000,
59 4900000,
60 4950000,
61 3300000,
62};
63
64static inline void max8997_set_gpio(struct max8997_data *max8997)
65{
66 int set3 = (max8997->buck125_gpioindex) & 0x1;
67 int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
68 int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;
69
70 gpio_set_value(max8997->buck125_gpios[0], set1);
71 gpio_set_value(max8997->buck125_gpios[1], set2);
72 gpio_set_value(max8997->buck125_gpios[2], set3);
73}
74
75struct voltage_map_desc {
76 int min;
77 int max;
78 int step;
79};
80
81/* Voltage maps in uV */
82static const struct voltage_map_desc ldo_voltage_map_desc = {
83 .min = 800000, .max = 3950000, .step = 50000,
84}; /* LDO1 ~ 18, 21 all */
85
86static const struct voltage_map_desc buck1245_voltage_map_desc = {
87 .min = 650000, .max = 2225000, .step = 25000,
88}; /* Buck1, 2, 4, 5 */
89
90static const struct voltage_map_desc buck37_voltage_map_desc = {
91 .min = 750000, .max = 3900000, .step = 50000,
92}; /* Buck3, 7 */
93
94/* current map in uA */
95static const struct voltage_map_desc charger_current_map_desc = {
96 .min = 200000, .max = 950000, .step = 50000,
97};
98
99static const struct voltage_map_desc topoff_current_map_desc = {
100 .min = 50000, .max = 200000, .step = 10000,
101};
102
103static const struct voltage_map_desc *reg_voltage_map[] = {
104 [MAX8997_LDO1] = &ldo_voltage_map_desc,
105 [MAX8997_LDO2] = &ldo_voltage_map_desc,
106 [MAX8997_LDO3] = &ldo_voltage_map_desc,
107 [MAX8997_LDO4] = &ldo_voltage_map_desc,
108 [MAX8997_LDO5] = &ldo_voltage_map_desc,
109 [MAX8997_LDO6] = &ldo_voltage_map_desc,
110 [MAX8997_LDO7] = &ldo_voltage_map_desc,
111 [MAX8997_LDO8] = &ldo_voltage_map_desc,
112 [MAX8997_LDO9] = &ldo_voltage_map_desc,
113 [MAX8997_LDO10] = &ldo_voltage_map_desc,
114 [MAX8997_LDO11] = &ldo_voltage_map_desc,
115 [MAX8997_LDO12] = &ldo_voltage_map_desc,
116 [MAX8997_LDO13] = &ldo_voltage_map_desc,
117 [MAX8997_LDO14] = &ldo_voltage_map_desc,
118 [MAX8997_LDO15] = &ldo_voltage_map_desc,
119 [MAX8997_LDO16] = &ldo_voltage_map_desc,
120 [MAX8997_LDO17] = &ldo_voltage_map_desc,
121 [MAX8997_LDO18] = &ldo_voltage_map_desc,
122 [MAX8997_LDO21] = &ldo_voltage_map_desc,
123 [MAX8997_BUCK1] = &buck1245_voltage_map_desc,
124 [MAX8997_BUCK2] = &buck1245_voltage_map_desc,
125 [MAX8997_BUCK3] = &buck37_voltage_map_desc,
126 [MAX8997_BUCK4] = &buck1245_voltage_map_desc,
127 [MAX8997_BUCK5] = &buck1245_voltage_map_desc,
128 [MAX8997_BUCK6] = NULL,
129 [MAX8997_BUCK7] = &buck37_voltage_map_desc,
130 [MAX8997_EN32KHZ_AP] = NULL,
131 [MAX8997_EN32KHZ_CP] = NULL,
132 [MAX8997_ENVICHG] = NULL,
133 [MAX8997_ESAFEOUT1] = NULL,
134 [MAX8997_ESAFEOUT2] = NULL,
135 [MAX8997_CHARGER_CV] = NULL,
136 [MAX8997_CHARGER] = &charger_current_map_desc,
137 [MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc,
138};
139
140static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev,
141 unsigned int selector)
142{
143 int rid = rdev_get_id(rdev);
144
145 if (rid != MAX8997_CHARGER_CV)
146 goto err;
147
148 switch (selector) {
149 case 0x00:
150 return 4200000;
151 case 0x01 ... 0x0E:
152 return 4000000 + 20000 * (selector - 0x01);
153 case 0x0F:
154 return 4350000;
155 default:
156 return -EINVAL;
157 }
158err:
159 return -EINVAL;
160}
161
162static int max8997_list_voltage(struct regulator_dev *rdev,
163 unsigned int selector)
164{
165 const struct voltage_map_desc *desc;
166 int rid = rdev_get_id(rdev);
167 int val;
168
169 if (rid >= ARRAY_SIZE(reg_voltage_map) ||
170 rid < 0)
171 return -EINVAL;
172
173 desc = reg_voltage_map[rid];
174 if (desc == NULL)
175 return -EINVAL;
176
177 val = desc->min + desc->step * selector;
178 if (val > desc->max)
179 return -EINVAL;
180
181 return val;
182}
183
184static int max8997_get_enable_register(struct regulator_dev *rdev,
185 int *reg, int *mask, int *pattern)
186{
187 int rid = rdev_get_id(rdev);
188
189 switch (rid) {
190 case MAX8997_LDO1 ... MAX8997_LDO21:
191 *reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
192 *mask = 0xC0;
193 *pattern = 0xC0;
194 break;
195 case MAX8997_BUCK1:
196 *reg = MAX8997_REG_BUCK1CTRL;
197 *mask = 0x01;
198 *pattern = 0x01;
199 break;
200 case MAX8997_BUCK2:
201 *reg = MAX8997_REG_BUCK2CTRL;
202 *mask = 0x01;
203 *pattern = 0x01;
204 break;
205 case MAX8997_BUCK3:
206 *reg = MAX8997_REG_BUCK3CTRL;
207 *mask = 0x01;
208 *pattern = 0x01;
209 break;
210 case MAX8997_BUCK4:
211 *reg = MAX8997_REG_BUCK4CTRL;
212 *mask = 0x01;
213 *pattern = 0x01;
214 break;
215 case MAX8997_BUCK5:
216 *reg = MAX8997_REG_BUCK5CTRL;
217 *mask = 0x01;
218 *pattern = 0x01;
219 break;
220 case MAX8997_BUCK6:
221 *reg = MAX8997_REG_BUCK6CTRL;
222 *mask = 0x01;
223 *pattern = 0x01;
224 break;
225 case MAX8997_BUCK7:
226 *reg = MAX8997_REG_BUCK7CTRL;
227 *mask = 0x01;
228 *pattern = 0x01;
229 break;
230 case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP:
231 *reg = MAX8997_REG_MAINCON1;
232 *mask = 0x01 << (rid - MAX8997_EN32KHZ_AP);
233 *pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP);
234 break;
235 case MAX8997_ENVICHG:
236 *reg = MAX8997_REG_MBCCTRL1;
237 *mask = 0x80;
238 *pattern = 0x80;
239 break;
240 case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
241 *reg = MAX8997_REG_SAFEOUTCTRL;
242 *mask = 0x40 << (rid - MAX8997_ESAFEOUT1);
243 *pattern = 0x40 << (rid - MAX8997_ESAFEOUT1);
244 break;
245 case MAX8997_CHARGER:
246 *reg = MAX8997_REG_MBCCTRL2;
247 *mask = 0x40;
248 *pattern = 0x40;
249 break;
250 default:
251 /* Not controllable or not exists */
252 return -EINVAL;
253 }
254
255 return 0;
256}
257
258static int max8997_reg_is_enabled(struct regulator_dev *rdev)
259{
260 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
261 struct i2c_client *i2c = max8997->iodev->i2c;
262 int ret, reg, mask, pattern;
263 u8 val;
264
265 ret = max8997_get_enable_register(rdev, ®, &mask, &pattern);
266 if (ret)
267 return ret;
268
269 ret = max8997_read_reg(i2c, reg, &val);
270 if (ret)
271 return ret;
272
273 return (val & mask) == pattern;
274}
275
276static int max8997_reg_enable(struct regulator_dev *rdev)
277{
278 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
279 struct i2c_client *i2c = max8997->iodev->i2c;
280 int ret, reg, mask, pattern;
281
282 ret = max8997_get_enable_register(rdev, ®, &mask, &pattern);
283 if (ret)
284 return ret;
285
286 return max8997_update_reg(i2c, reg, pattern, mask);
287}
288
289static int max8997_reg_disable(struct regulator_dev *rdev)
290{
291 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
292 struct i2c_client *i2c = max8997->iodev->i2c;
293 int ret, reg, mask, pattern;
294
295 ret = max8997_get_enable_register(rdev, ®, &mask, &pattern);
296 if (ret)
297 return ret;
298
299 return max8997_update_reg(i2c, reg, ~pattern, mask);
300}
301
302static int max8997_get_voltage_register(struct regulator_dev *rdev,
303 int *_reg, int *_shift, int *_mask)
304{
305 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
306 int rid = rdev_get_id(rdev);
307 int reg, shift = 0, mask = 0x3f;
308
309 switch (rid) {
310 case MAX8997_LDO1 ... MAX8997_LDO21:
311 reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
312 break;
313 case MAX8997_BUCK1:
314 reg = MAX8997_REG_BUCK1DVS1;
315 if (max8997->buck1_gpiodvs)
316 reg += max8997->buck125_gpioindex;
317 break;
318 case MAX8997_BUCK2:
319 reg = MAX8997_REG_BUCK2DVS1;
320 if (max8997->buck2_gpiodvs)
321 reg += max8997->buck125_gpioindex;
322 break;
323 case MAX8997_BUCK3:
324 reg = MAX8997_REG_BUCK3DVS;
325 break;
326 case MAX8997_BUCK4:
327 reg = MAX8997_REG_BUCK4DVS;
328 break;
329 case MAX8997_BUCK5:
330 reg = MAX8997_REG_BUCK5DVS1;
331 if (max8997->buck5_gpiodvs)
332 reg += max8997->buck125_gpioindex;
333 break;
334 case MAX8997_BUCK7:
335 reg = MAX8997_REG_BUCK7DVS;
336 break;
337 case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
338 reg = MAX8997_REG_SAFEOUTCTRL;
339 shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0;
340 mask = 0x3;
341 break;
342 case MAX8997_CHARGER_CV:
343 reg = MAX8997_REG_MBCCTRL3;
344 shift = 0;
345 mask = 0xf;
346 break;
347 case MAX8997_CHARGER:
348 reg = MAX8997_REG_MBCCTRL4;
349 shift = 0;
350 mask = 0xf;
351 break;
352 case MAX8997_CHARGER_TOPOFF:
353 reg = MAX8997_REG_MBCCTRL5;
354 shift = 0;
355 mask = 0xf;
356 break;
357 default:
358 return -EINVAL;
359 }
360
361 *_reg = reg;
362 *_shift = shift;
363 *_mask = mask;
364
365 return 0;
366}
367
368static int max8997_get_voltage_sel(struct regulator_dev *rdev)
369{
370 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
371 struct i2c_client *i2c = max8997->iodev->i2c;
372 int reg, shift, mask, ret;
373 u8 val;
374
375 ret = max8997_get_voltage_register(rdev, ®, &shift, &mask);
376 if (ret)
377 return ret;
378
379 ret = max8997_read_reg(i2c, reg, &val);
380 if (ret)
381 return ret;
382
383 val >>= shift;
384 val &= mask;
385
386 return val;
387}
388
389static inline int max8997_get_voltage_proper_val(
390 const struct voltage_map_desc *desc,
391 int min_vol, int max_vol)
392{
393 int i;
394
395 if (desc == NULL)
396 return -EINVAL;
397
398 if (max_vol < desc->min || min_vol > desc->max)
399 return -EINVAL;
400
401 if (min_vol < desc->min)
402 min_vol = desc->min;
403
404 i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
405
406 if (desc->min + desc->step * i > max_vol)
407 return -EINVAL;
408
409 return i;
410}
411
412static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev,
413 int min_uV, int max_uV, unsigned *selector)
414{
415 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
416 struct i2c_client *i2c = max8997->iodev->i2c;
417 int rid = rdev_get_id(rdev);
418 int lb, ub;
419 int reg, shift = 0, mask, ret = 0;
420 u8 val = 0x0;
421
422 if (rid != MAX8997_CHARGER_CV)
423 return -EINVAL;
424
425 ret = max8997_get_voltage_register(rdev, ®, &shift, &mask);
426 if (ret)
427 return ret;
428
429 if (max_uV < 4000000 || min_uV > 4350000)
430 return -EINVAL;
431
432 if (min_uV <= 4000000) {
433 if (max_uV >= 4000000)
434 return -EINVAL;
435 else
436 val = 0x1;
437 } else if (min_uV <= 4200000 && max_uV >= 4200000)
438 val = 0x0;
439 else {
440 lb = (min_uV - 4000001) / 20000 + 2;
441 ub = (max_uV - 4000000) / 20000 + 1;
442
443 if (lb > ub)
444 return -EINVAL;
445
446 if (lb < 0xf)
447 val = lb;
448 else {
449 if (ub >= 0xf)
450 val = 0xf;
451 else
452 return -EINVAL;
453 }
454 }
455
456 *selector = val;
457
458 ret = max8997_update_reg(i2c, reg, val << shift, mask);
459
460 return ret;
461}
462
463/*
464 * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
465 * BUCK1, 2, and 5 are available if they are not controlled by gpio
466 */
467static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
468 int min_uV, int max_uV, unsigned *selector)
469{
470 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
471 struct i2c_client *i2c = max8997->iodev->i2c;
472 const struct voltage_map_desc *desc;
473 int rid = rdev_get_id(rdev);
474 int i, reg, shift, mask, ret;
475
476 switch (rid) {
477 case MAX8997_LDO1 ... MAX8997_LDO21:
478 break;
479 case MAX8997_BUCK1 ... MAX8997_BUCK5:
480 break;
481 case MAX8997_BUCK6:
482 return -EINVAL;
483 case MAX8997_BUCK7:
484 break;
485 case MAX8997_CHARGER:
486 break;
487 case MAX8997_CHARGER_TOPOFF:
488 break;
489 default:
490 return -EINVAL;
491 }
492
493 desc = reg_voltage_map[rid];
494
495 i = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
496 if (i < 0)
497 return i;
498
499 ret = max8997_get_voltage_register(rdev, ®, &shift, &mask);
500 if (ret)
501 return ret;
502
503 ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
504 *selector = i;
505
506 return ret;
507}
508
509static int max8997_set_voltage_buck_time_sel(struct regulator_dev *rdev,
510 unsigned int old_selector,
511 unsigned int new_selector)
512{
513 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
514 int rid = rdev_get_id(rdev);
515 const struct voltage_map_desc *desc = reg_voltage_map[rid];
516
517 /* Delay is required only if the voltage is increasing */
518 if (old_selector >= new_selector)
519 return 0;
520
521 /* No need to delay if gpio_dvs_mode */
522 switch (rid) {
523 case MAX8997_BUCK1:
524 if (max8997->buck1_gpiodvs)
525 return 0;
526 break;
527 case MAX8997_BUCK2:
528 if (max8997->buck2_gpiodvs)
529 return 0;
530 break;
531 case MAX8997_BUCK5:
532 if (max8997->buck5_gpiodvs)
533 return 0;
534 break;
535 }
536
537 switch (rid) {
538 case MAX8997_BUCK1:
539 case MAX8997_BUCK2:
540 case MAX8997_BUCK4:
541 case MAX8997_BUCK5:
542 return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
543 max8997->ramp_delay * 1000);
544 }
545
546 return 0;
547}
548
549/*
550 * Assess the damage on the voltage setting of BUCK1,2,5 by the change.
551 *
552 * When GPIO-DVS mode is used for multiple bucks, changing the voltage value
553 * of one of the bucks may affect that of another buck, which is the side
554 * effect of the change (set_voltage). This function examines the GPIO-DVS
555 * configurations and checks whether such side-effect exists.
556 */
557static int max8997_assess_side_effect(struct regulator_dev *rdev,
558 u8 new_val, int *best)
559{
560 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
561 int rid = rdev_get_id(rdev);
562 u8 *buckx_val[3];
563 bool buckx_gpiodvs[3];
564 int side_effect[8];
565 int min_side_effect = INT_MAX;
566 int i;
567
568 *best = -1;
569
570 switch (rid) {
571 case MAX8997_BUCK1:
572 rid = 0;
573 break;
574 case MAX8997_BUCK2:
575 rid = 1;
576 break;
577 case MAX8997_BUCK5:
578 rid = 2;
579 break;
580 default:
581 return -EINVAL;
582 }
583
584 buckx_val[0] = max8997->buck1_vol;
585 buckx_val[1] = max8997->buck2_vol;
586 buckx_val[2] = max8997->buck5_vol;
587 buckx_gpiodvs[0] = max8997->buck1_gpiodvs;
588 buckx_gpiodvs[1] = max8997->buck2_gpiodvs;
589 buckx_gpiodvs[2] = max8997->buck5_gpiodvs;
590
591 for (i = 0; i < 8; i++) {
592 int others;
593
594 if (new_val != (buckx_val[rid])[i]) {
595 side_effect[i] = -1;
596 continue;
597 }
598
599 side_effect[i] = 0;
600 for (others = 0; others < 3; others++) {
601 int diff;
602
603 if (others == rid)
604 continue;
605 if (buckx_gpiodvs[others] == false)
606 continue; /* Not affected */
607 diff = (buckx_val[others])[i] -
608 (buckx_val[others])[max8997->buck125_gpioindex];
609 if (diff > 0)
610 side_effect[i] += diff;
611 else if (diff < 0)
612 side_effect[i] -= diff;
613 }
614 if (side_effect[i] == 0) {
615 *best = i;
616 return 0; /* NO SIDE EFFECT! Use This! */
617 }
618 if (side_effect[i] < min_side_effect) {
619 min_side_effect = side_effect[i];
620 *best = i;
621 }
622 }
623
624 if (*best == -1)
625 return -EINVAL;
626
627 return side_effect[*best];
628}
629
630/*
631 * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
632 * max8997_set_voltage_ldobuck to do the job.
633 */
634static int max8997_set_voltage_buck(struct regulator_dev *rdev,
635 int min_uV, int max_uV, unsigned *selector)
636{
637 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
638 int rid = rdev_get_id(rdev);
639 const struct voltage_map_desc *desc;
640 int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
641 bool gpio_dvs_mode = false;
642
643 if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
644 return -EINVAL;
645
646 switch (rid) {
647 case MAX8997_BUCK1:
648 if (max8997->buck1_gpiodvs)
649 gpio_dvs_mode = true;
650 break;
651 case MAX8997_BUCK2:
652 if (max8997->buck2_gpiodvs)
653 gpio_dvs_mode = true;
654 break;
655 case MAX8997_BUCK5:
656 if (max8997->buck5_gpiodvs)
657 gpio_dvs_mode = true;
658 break;
659 }
660
661 if (!gpio_dvs_mode)
662 return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV,
663 selector);
664
665 desc = reg_voltage_map[rid];
666 new_val = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
667 if (new_val < 0)
668 return new_val;
669
670 tmp_dmg = INT_MAX;
671 tmp_idx = -1;
672 tmp_val = -1;
673 do {
674 damage = max8997_assess_side_effect(rdev, new_val, &new_idx);
675 if (damage == 0)
676 goto out;
677
678 if (tmp_dmg > damage) {
679 tmp_idx = new_idx;
680 tmp_val = new_val;
681 tmp_dmg = damage;
682 }
683
684 new_val++;
685 } while (desc->min + desc->step * new_val <= desc->max);
686
687 new_idx = tmp_idx;
688 new_val = tmp_val;
689
690 if (max8997->ignore_gpiodvs_side_effect == false)
691 return -EINVAL;
692
693 dev_warn(&rdev->dev,
694 "MAX8997 GPIO-DVS Side Effect Warning: GPIO SET: %d -> %d\n",
695 max8997->buck125_gpioindex, tmp_idx);
696
697out:
698 if (new_idx < 0 || new_val < 0)
699 return -EINVAL;
700
701 max8997->buck125_gpioindex = new_idx;
702 max8997_set_gpio(max8997);
703 *selector = new_val;
704
705 return 0;
706}
707
708/* For SAFEOUT1 and SAFEOUT2 */
709static int max8997_set_voltage_safeout_sel(struct regulator_dev *rdev,
710 unsigned selector)
711{
712 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
713 struct i2c_client *i2c = max8997->iodev->i2c;
714 int rid = rdev_get_id(rdev);
715 int reg, shift = 0, mask, ret;
716
717 if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2)
718 return -EINVAL;
719
720 ret = max8997_get_voltage_register(rdev, ®, &shift, &mask);
721 if (ret)
722 return ret;
723
724 return max8997_update_reg(i2c, reg, selector << shift, mask << shift);
725}
726
727static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
728{
729 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
730 struct i2c_client *i2c = max8997->iodev->i2c;
731 int ret, reg, mask, pattern;
732 int rid = rdev_get_id(rdev);
733
734 ret = max8997_get_enable_register(rdev, ®, &mask, &pattern);
735 if (ret)
736 return ret;
737
738 max8997_read_reg(i2c, reg, &max8997->saved_states[rid]);
739
740 if (rid == MAX8997_LDO1 ||
741 rid == MAX8997_LDO10 ||
742 rid == MAX8997_LDO21) {
743 dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n",
744 rdev->desc->name);
745 return max8997_update_reg(i2c, reg, 0x40, mask);
746 }
747
748 dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
749 rdev->desc->name, max8997->saved_states[rid] & mask,
750 (~pattern) & mask);
751 return max8997_update_reg(i2c, reg, ~pattern, mask);
752}
753
754static struct regulator_ops max8997_ldo_ops = {
755 .list_voltage = max8997_list_voltage,
756 .is_enabled = max8997_reg_is_enabled,
757 .enable = max8997_reg_enable,
758 .disable = max8997_reg_disable,
759 .get_voltage_sel = max8997_get_voltage_sel,
760 .set_voltage = max8997_set_voltage_ldobuck,
761 .set_suspend_disable = max8997_reg_disable_suspend,
762};
763
764static struct regulator_ops max8997_buck_ops = {
765 .list_voltage = max8997_list_voltage,
766 .is_enabled = max8997_reg_is_enabled,
767 .enable = max8997_reg_enable,
768 .disable = max8997_reg_disable,
769 .get_voltage_sel = max8997_get_voltage_sel,
770 .set_voltage = max8997_set_voltage_buck,
771 .set_voltage_time_sel = max8997_set_voltage_buck_time_sel,
772 .set_suspend_disable = max8997_reg_disable_suspend,
773};
774
775static struct regulator_ops max8997_fixedvolt_ops = {
776 .list_voltage = max8997_list_voltage,
777 .is_enabled = max8997_reg_is_enabled,
778 .enable = max8997_reg_enable,
779 .disable = max8997_reg_disable,
780 .set_suspend_disable = max8997_reg_disable_suspend,
781};
782
783static struct regulator_ops max8997_safeout_ops = {
784 .list_voltage = regulator_list_voltage_table,
785 .is_enabled = max8997_reg_is_enabled,
786 .enable = max8997_reg_enable,
787 .disable = max8997_reg_disable,
788 .get_voltage_sel = max8997_get_voltage_sel,
789 .set_voltage_sel = max8997_set_voltage_safeout_sel,
790 .set_suspend_disable = max8997_reg_disable_suspend,
791};
792
793static struct regulator_ops max8997_fixedstate_ops = {
794 .list_voltage = max8997_list_voltage_charger_cv,
795 .get_voltage_sel = max8997_get_voltage_sel,
796 .set_voltage = max8997_set_voltage_charger_cv,
797};
798
799static int max8997_set_current_limit(struct regulator_dev *rdev,
800 int min_uA, int max_uA)
801{
802 unsigned dummy;
803 int rid = rdev_get_id(rdev);
804
805 if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
806 return -EINVAL;
807
808 /* Reuse max8997_set_voltage_ldobuck to set current_limit. */
809 return max8997_set_voltage_ldobuck(rdev, min_uA, max_uA, &dummy);
810}
811
812static int max8997_get_current_limit(struct regulator_dev *rdev)
813{
814 int sel, rid = rdev_get_id(rdev);
815
816 if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
817 return -EINVAL;
818
819 sel = max8997_get_voltage_sel(rdev);
820 if (sel < 0)
821 return sel;
822
823 /* Reuse max8997_list_voltage to get current_limit. */
824 return max8997_list_voltage(rdev, sel);
825}
826
827static struct regulator_ops max8997_charger_ops = {
828 .is_enabled = max8997_reg_is_enabled,
829 .enable = max8997_reg_enable,
830 .disable = max8997_reg_disable,
831 .get_current_limit = max8997_get_current_limit,
832 .set_current_limit = max8997_set_current_limit,
833};
834
835static struct regulator_ops max8997_charger_fixedstate_ops = {
836 .get_current_limit = max8997_get_current_limit,
837 .set_current_limit = max8997_set_current_limit,
838};
839
840#define MAX8997_VOLTAGE_REGULATOR(_name, _ops) {\
841 .name = #_name, \
842 .id = MAX8997_##_name, \
843 .ops = &_ops, \
844 .type = REGULATOR_VOLTAGE, \
845 .owner = THIS_MODULE, \
846}
847
848#define MAX8997_CURRENT_REGULATOR(_name, _ops) {\
849 .name = #_name, \
850 .id = MAX8997_##_name, \
851 .ops = &_ops, \
852 .type = REGULATOR_CURRENT, \
853 .owner = THIS_MODULE, \
854}
855
856static struct regulator_desc regulators[] = {
857 MAX8997_VOLTAGE_REGULATOR(LDO1, max8997_ldo_ops),
858 MAX8997_VOLTAGE_REGULATOR(LDO2, max8997_ldo_ops),
859 MAX8997_VOLTAGE_REGULATOR(LDO3, max8997_ldo_ops),
860 MAX8997_VOLTAGE_REGULATOR(LDO4, max8997_ldo_ops),
861 MAX8997_VOLTAGE_REGULATOR(LDO5, max8997_ldo_ops),
862 MAX8997_VOLTAGE_REGULATOR(LDO6, max8997_ldo_ops),
863 MAX8997_VOLTAGE_REGULATOR(LDO7, max8997_ldo_ops),
864 MAX8997_VOLTAGE_REGULATOR(LDO8, max8997_ldo_ops),
865 MAX8997_VOLTAGE_REGULATOR(LDO9, max8997_ldo_ops),
866 MAX8997_VOLTAGE_REGULATOR(LDO10, max8997_ldo_ops),
867 MAX8997_VOLTAGE_REGULATOR(LDO11, max8997_ldo_ops),
868 MAX8997_VOLTAGE_REGULATOR(LDO12, max8997_ldo_ops),
869 MAX8997_VOLTAGE_REGULATOR(LDO13, max8997_ldo_ops),
870 MAX8997_VOLTAGE_REGULATOR(LDO14, max8997_ldo_ops),
871 MAX8997_VOLTAGE_REGULATOR(LDO15, max8997_ldo_ops),
872 MAX8997_VOLTAGE_REGULATOR(LDO16, max8997_ldo_ops),
873 MAX8997_VOLTAGE_REGULATOR(LDO17, max8997_ldo_ops),
874 MAX8997_VOLTAGE_REGULATOR(LDO18, max8997_ldo_ops),
875 MAX8997_VOLTAGE_REGULATOR(LDO21, max8997_ldo_ops),
876 MAX8997_VOLTAGE_REGULATOR(BUCK1, max8997_buck_ops),
877 MAX8997_VOLTAGE_REGULATOR(BUCK2, max8997_buck_ops),
878 MAX8997_VOLTAGE_REGULATOR(BUCK3, max8997_buck_ops),
879 MAX8997_VOLTAGE_REGULATOR(BUCK4, max8997_buck_ops),
880 MAX8997_VOLTAGE_REGULATOR(BUCK5, max8997_buck_ops),
881 MAX8997_VOLTAGE_REGULATOR(BUCK6, max8997_fixedvolt_ops),
882 MAX8997_VOLTAGE_REGULATOR(BUCK7, max8997_buck_ops),
883 MAX8997_VOLTAGE_REGULATOR(EN32KHZ_AP, max8997_fixedvolt_ops),
884 MAX8997_VOLTAGE_REGULATOR(EN32KHZ_CP, max8997_fixedvolt_ops),
885 MAX8997_VOLTAGE_REGULATOR(ENVICHG, max8997_fixedvolt_ops),
886 MAX8997_VOLTAGE_REGULATOR(ESAFEOUT1, max8997_safeout_ops),
887 MAX8997_VOLTAGE_REGULATOR(ESAFEOUT2, max8997_safeout_ops),
888 MAX8997_VOLTAGE_REGULATOR(CHARGER_CV, max8997_fixedstate_ops),
889 MAX8997_CURRENT_REGULATOR(CHARGER, max8997_charger_ops),
890 MAX8997_CURRENT_REGULATOR(CHARGER_TOPOFF,
891 max8997_charger_fixedstate_ops),
892};
893
894#ifdef CONFIG_OF
895static int max8997_pmic_dt_parse_dvs_gpio(struct platform_device *pdev,
896 struct max8997_platform_data *pdata,
897 struct device_node *pmic_np)
898{
899 int i, gpio;
900
901 for (i = 0; i < 3; i++) {
902 gpio = of_get_named_gpio(pmic_np,
903 "max8997,pmic-buck125-dvs-gpios", i);
904 if (!gpio_is_valid(gpio)) {
905 dev_err(&pdev->dev, "invalid gpio[%d]: %d\n", i, gpio);
906 return -EINVAL;
907 }
908 pdata->buck125_gpios[i] = gpio;
909 }
910 return 0;
911}
912
913static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
914 struct max8997_platform_data *pdata)
915{
916 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
917 struct device_node *pmic_np, *regulators_np, *reg_np;
918 struct max8997_regulator_data *rdata;
919 unsigned int i, dvs_voltage_nr = 1, ret;
920
921 pmic_np = of_node_get(iodev->dev->of_node);
922 if (!pmic_np) {
923 dev_err(&pdev->dev, "could not find pmic sub-node\n");
924 return -ENODEV;
925 }
926
927 regulators_np = of_find_node_by_name(pmic_np, "regulators");
928 if (!regulators_np) {
929 dev_err(&pdev->dev, "could not find regulators sub-node\n");
930 return -EINVAL;
931 }
932
933 /* count the number of regulators to be supported in pmic */
934 pdata->num_regulators = of_get_child_count(regulators_np);
935
936 rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) *
937 pdata->num_regulators, GFP_KERNEL);
938 if (!rdata) {
939 of_node_put(regulators_np);
940 dev_err(&pdev->dev, "could not allocate memory for regulator data\n");
941 return -ENOMEM;
942 }
943
944 pdata->regulators = rdata;
945 for_each_child_of_node(regulators_np, reg_np) {
946 for (i = 0; i < ARRAY_SIZE(regulators); i++)
947 if (!of_node_cmp(reg_np->name, regulators[i].name))
948 break;
949
950 if (i == ARRAY_SIZE(regulators)) {
951 dev_warn(&pdev->dev, "don't know how to configure regulator %s\n",
952 reg_np->name);
953 continue;
954 }
955
956 rdata->id = i;
957 rdata->initdata = of_get_regulator_init_data(&pdev->dev,
958 reg_np);
959 rdata->reg_node = reg_np;
960 rdata++;
961 }
962 of_node_put(regulators_np);
963
964 if (of_get_property(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs", NULL))
965 pdata->buck1_gpiodvs = true;
966
967 if (of_get_property(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs", NULL))
968 pdata->buck2_gpiodvs = true;
969
970 if (of_get_property(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs", NULL))
971 pdata->buck5_gpiodvs = true;
972
973 if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
974 pdata->buck5_gpiodvs) {
975 ret = max8997_pmic_dt_parse_dvs_gpio(pdev, pdata, pmic_np);
976 if (ret)
977 return -EINVAL;
978
979 if (of_property_read_u32(pmic_np,
980 "max8997,pmic-buck125-default-dvs-idx",
981 &pdata->buck125_default_idx)) {
982 pdata->buck125_default_idx = 0;
983 } else {
984 if (pdata->buck125_default_idx >= 8) {
985 pdata->buck125_default_idx = 0;
986 dev_info(&pdev->dev, "invalid value for default dvs index, using 0 instead\n");
987 }
988 }
989
990 if (of_get_property(pmic_np,
991 "max8997,pmic-ignore-gpiodvs-side-effect", NULL))
992 pdata->ignore_gpiodvs_side_effect = true;
993
994 dvs_voltage_nr = 8;
995 }
996
997 if (of_property_read_u32_array(pmic_np,
998 "max8997,pmic-buck1-dvs-voltage",
999 pdata->buck1_voltage, dvs_voltage_nr)) {
1000 dev_err(&pdev->dev, "buck1 voltages not specified\n");
1001 return -EINVAL;
1002 }
1003
1004 if (of_property_read_u32_array(pmic_np,
1005 "max8997,pmic-buck2-dvs-voltage",
1006 pdata->buck2_voltage, dvs_voltage_nr)) {
1007 dev_err(&pdev->dev, "buck2 voltages not specified\n");
1008 return -EINVAL;
1009 }
1010
1011 if (of_property_read_u32_array(pmic_np,
1012 "max8997,pmic-buck5-dvs-voltage",
1013 pdata->buck5_voltage, dvs_voltage_nr)) {
1014 dev_err(&pdev->dev, "buck5 voltages not specified\n");
1015 return -EINVAL;
1016 }
1017
1018 return 0;
1019}
1020#else
1021static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
1022 struct max8997_platform_data *pdata)
1023{
1024 return 0;
1025}
1026#endif /* CONFIG_OF */
1027
1028static int max8997_pmic_probe(struct platform_device *pdev)
1029{
1030 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
1031 struct max8997_platform_data *pdata = iodev->pdata;
1032 struct regulator_config config = { };
1033 struct regulator_dev **rdev;
1034 struct max8997_data *max8997;
1035 struct i2c_client *i2c;
1036 int i, ret, size, nr_dvs;
1037 u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
1038
1039 if (!pdata) {
1040 dev_err(&pdev->dev, "No platform init data supplied.\n");
1041 return -ENODEV;
1042 }
1043
1044 if (iodev->dev->of_node) {
1045 ret = max8997_pmic_dt_parse_pdata(pdev, pdata);
1046 if (ret)
1047 return ret;
1048 }
1049
1050 max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
1051 GFP_KERNEL);
1052 if (!max8997)
1053 return -ENOMEM;
1054
1055 size = sizeof(struct regulator_dev *) * pdata->num_regulators;
1056 max8997->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
1057 if (!max8997->rdev)
1058 return -ENOMEM;
1059
1060 rdev = max8997->rdev;
1061 max8997->dev = &pdev->dev;
1062 max8997->iodev = iodev;
1063 max8997->num_regulators = pdata->num_regulators;
1064 platform_set_drvdata(pdev, max8997);
1065 i2c = max8997->iodev->i2c;
1066
1067 max8997->buck125_gpioindex = pdata->buck125_default_idx;
1068 max8997->buck1_gpiodvs = pdata->buck1_gpiodvs;
1069 max8997->buck2_gpiodvs = pdata->buck2_gpiodvs;
1070 max8997->buck5_gpiodvs = pdata->buck5_gpiodvs;
1071 memcpy(max8997->buck125_gpios, pdata->buck125_gpios, sizeof(int) * 3);
1072 max8997->ignore_gpiodvs_side_effect = pdata->ignore_gpiodvs_side_effect;
1073
1074 nr_dvs = (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1075 pdata->buck5_gpiodvs) ? 8 : 1;
1076
1077 for (i = 0; i < nr_dvs; i++) {
1078 max8997->buck1_vol[i] = ret =
1079 max8997_get_voltage_proper_val(
1080 &buck1245_voltage_map_desc,
1081 pdata->buck1_voltage[i],
1082 pdata->buck1_voltage[i] +
1083 buck1245_voltage_map_desc.step);
1084 if (ret < 0)
1085 return ret;
1086
1087 max8997->buck2_vol[i] = ret =
1088 max8997_get_voltage_proper_val(
1089 &buck1245_voltage_map_desc,
1090 pdata->buck2_voltage[i],
1091 pdata->buck2_voltage[i] +
1092 buck1245_voltage_map_desc.step);
1093 if (ret < 0)
1094 return ret;
1095
1096 max8997->buck5_vol[i] = ret =
1097 max8997_get_voltage_proper_val(
1098 &buck1245_voltage_map_desc,
1099 pdata->buck5_voltage[i],
1100 pdata->buck5_voltage[i] +
1101 buck1245_voltage_map_desc.step);
1102 if (ret < 0)
1103 return ret;
1104
1105 if (max_buck1 < max8997->buck1_vol[i])
1106 max_buck1 = max8997->buck1_vol[i];
1107 if (max_buck2 < max8997->buck2_vol[i])
1108 max_buck2 = max8997->buck2_vol[i];
1109 if (max_buck5 < max8997->buck5_vol[i])
1110 max_buck5 = max8997->buck5_vol[i];
1111 }
1112
1113 /* For the safety, set max voltage before setting up */
1114 for (i = 0; i < 8; i++) {
1115 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1116 max_buck1, 0x3f);
1117 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1118 max_buck2, 0x3f);
1119 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1120 max_buck5, 0x3f);
1121 }
1122
1123 /* Initialize all the DVS related BUCK registers */
1124 for (i = 0; i < nr_dvs; i++) {
1125 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1126 max8997->buck1_vol[i],
1127 0x3f);
1128 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1129 max8997->buck2_vol[i],
1130 0x3f);
1131 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1132 max8997->buck5_vol[i],
1133 0x3f);
1134 }
1135
1136 /*
1137 * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them.
1138 * If at least one of them cares, set gpios.
1139 */
1140 if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1141 pdata->buck5_gpiodvs) {
1142
1143 if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
1144 !gpio_is_valid(pdata->buck125_gpios[1]) ||
1145 !gpio_is_valid(pdata->buck125_gpios[2])) {
1146 dev_err(&pdev->dev, "GPIO NOT VALID\n");
1147 return -EINVAL;
1148 }
1149
1150 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[0],
1151 "MAX8997 SET1");
1152 if (ret)
1153 return ret;
1154
1155 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[1],
1156 "MAX8997 SET2");
1157 if (ret)
1158 return ret;
1159
1160 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[2],
1161 "MAX8997 SET3");
1162 if (ret)
1163 return ret;
1164
1165 gpio_direction_output(pdata->buck125_gpios[0],
1166 (max8997->buck125_gpioindex >> 2)
1167 & 0x1); /* SET1 */
1168 gpio_direction_output(pdata->buck125_gpios[1],
1169 (max8997->buck125_gpioindex >> 1)
1170 & 0x1); /* SET2 */
1171 gpio_direction_output(pdata->buck125_gpios[2],
1172 (max8997->buck125_gpioindex >> 0)
1173 & 0x1); /* SET3 */
1174 }
1175
1176 /* DVS-GPIO disabled */
1177 max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ?
1178 (1 << 1) : (0 << 1), 1 << 1);
1179 max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ?
1180 (1 << 1) : (0 << 1), 1 << 1);
1181 max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ?
1182 (1 << 1) : (0 << 1), 1 << 1);
1183
1184 /* Misc Settings */
1185 max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
1186 max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
1187
1188 for (i = 0; i < pdata->num_regulators; i++) {
1189 const struct voltage_map_desc *desc;
1190 int id = pdata->regulators[i].id;
1191
1192 desc = reg_voltage_map[id];
1193 if (desc) {
1194 regulators[id].n_voltages =
1195 (desc->max - desc->min) / desc->step + 1;
1196 } else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2) {
1197 regulators[id].volt_table = safeoutvolt;
1198 regulators[id].n_voltages = ARRAY_SIZE(safeoutvolt);
1199 } else if (id == MAX8997_CHARGER_CV) {
1200 regulators[id].n_voltages = 16;
1201 }
1202
1203 config.dev = max8997->dev;
1204 config.init_data = pdata->regulators[i].initdata;
1205 config.driver_data = max8997;
1206 config.of_node = pdata->regulators[i].reg_node;
1207
1208 rdev[i] = devm_regulator_register(&pdev->dev, ®ulators[id],
1209 &config);
1210 if (IS_ERR(rdev[i])) {
1211 dev_err(max8997->dev, "regulator init failed for %d\n",
1212 id);
1213 return PTR_ERR(rdev[i]);
1214 }
1215 }
1216
1217 return 0;
1218}
1219
1220static const struct platform_device_id max8997_pmic_id[] = {
1221 { "max8997-pmic", 0},
1222 { },
1223};
1224MODULE_DEVICE_TABLE(platform, max8997_pmic_id);
1225
1226static struct platform_driver max8997_pmic_driver = {
1227 .driver = {
1228 .name = "max8997-pmic",
1229 .owner = THIS_MODULE,
1230 },
1231 .probe = max8997_pmic_probe,
1232 .id_table = max8997_pmic_id,
1233};
1234
1235static int __init max8997_pmic_init(void)
1236{
1237 return platform_driver_register(&max8997_pmic_driver);
1238}
1239subsys_initcall(max8997_pmic_init);
1240
1241static void __exit max8997_pmic_cleanup(void)
1242{
1243 platform_driver_unregister(&max8997_pmic_driver);
1244}
1245module_exit(max8997_pmic_cleanup);
1246
1247MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver");
1248MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1249MODULE_LICENSE("GPL");