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Linux 4.1.16
[linux/fpc-iii.git] / drivers / regulator / max8997.c
blobea0196d4496b949d59e51ab2df96ad6b74bbd057
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 int ramp_delay; /* in mV/us */
42
43 bool buck1_gpiodvs;
44 bool buck2_gpiodvs;
45 bool buck5_gpiodvs;
46 u8 buck1_vol[8];
47 u8 buck2_vol[8];
48 u8 buck5_vol[8];
49 int buck125_gpios[3];
50 int buck125_gpioindex;
51 bool ignore_gpiodvs_side_effect;
52
53 u8 saved_states[MAX8997_REG_MAX];
54 };
55
56 static const unsigned int safeoutvolt[] = {
57 4850000,
58 4900000,
59 4950000,
60 3300000,
61 };
62
63 static inline void max8997_set_gpio(struct max8997_data *max8997)
64 {
65 int set3 = (max8997->buck125_gpioindex) & 0x1;
66 int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
67 int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;
68
69 gpio_set_value(max8997->buck125_gpios[0], set1);
70 gpio_set_value(max8997->buck125_gpios[1], set2);
71 gpio_set_value(max8997->buck125_gpios[2], set3);
72 }
73
74 struct voltage_map_desc {
75 int min;
76 int max;
77 int step;
78 };
79
80 /* Voltage maps in uV */
81 static const struct voltage_map_desc ldo_voltage_map_desc = {
82 .min = 800000, .max = 3950000, .step = 50000,
83 }; /* LDO1 ~ 18, 21 all */
84
85 static const struct voltage_map_desc buck1245_voltage_map_desc = {
86 .min = 650000, .max = 2225000, .step = 25000,
87 }; /* Buck1, 2, 4, 5 */
88
89 static const struct voltage_map_desc buck37_voltage_map_desc = {
90 .min = 750000, .max = 3900000, .step = 50000,
91 }; /* Buck3, 7 */
92
93 /* current map in uA */
94 static const struct voltage_map_desc charger_current_map_desc = {
95 .min = 200000, .max = 950000, .step = 50000,
96 };
97
98 static const struct voltage_map_desc topoff_current_map_desc = {
99 .min = 50000, .max = 200000, .step = 10000,
100 };
101
102 static const struct voltage_map_desc *reg_voltage_map[] = {
103 [MAX8997_LDO1] = &ldo_voltage_map_desc,
104 [MAX8997_LDO2] = &ldo_voltage_map_desc,
105 [MAX8997_LDO3] = &ldo_voltage_map_desc,
106 [MAX8997_LDO4] = &ldo_voltage_map_desc,
107 [MAX8997_LDO5] = &ldo_voltage_map_desc,
108 [MAX8997_LDO6] = &ldo_voltage_map_desc,
109 [MAX8997_LDO7] = &ldo_voltage_map_desc,
110 [MAX8997_LDO8] = &ldo_voltage_map_desc,
111 [MAX8997_LDO9] = &ldo_voltage_map_desc,
112 [MAX8997_LDO10] = &ldo_voltage_map_desc,
113 [MAX8997_LDO11] = &ldo_voltage_map_desc,
114 [MAX8997_LDO12] = &ldo_voltage_map_desc,
115 [MAX8997_LDO13] = &ldo_voltage_map_desc,
116 [MAX8997_LDO14] = &ldo_voltage_map_desc,
117 [MAX8997_LDO15] = &ldo_voltage_map_desc,
118 [MAX8997_LDO16] = &ldo_voltage_map_desc,
119 [MAX8997_LDO17] = &ldo_voltage_map_desc,
120 [MAX8997_LDO18] = &ldo_voltage_map_desc,
121 [MAX8997_LDO21] = &ldo_voltage_map_desc,
122 [MAX8997_BUCK1] = &buck1245_voltage_map_desc,
123 [MAX8997_BUCK2] = &buck1245_voltage_map_desc,
124 [MAX8997_BUCK3] = &buck37_voltage_map_desc,
125 [MAX8997_BUCK4] = &buck1245_voltage_map_desc,
126 [MAX8997_BUCK5] = &buck1245_voltage_map_desc,
127 [MAX8997_BUCK6] = NULL,
128 [MAX8997_BUCK7] = &buck37_voltage_map_desc,
129 [MAX8997_EN32KHZ_AP] = NULL,
130 [MAX8997_EN32KHZ_CP] = NULL,
131 [MAX8997_ENVICHG] = NULL,
132 [MAX8997_ESAFEOUT1] = NULL,
133 [MAX8997_ESAFEOUT2] = NULL,
134 [MAX8997_CHARGER_CV] = NULL,
135 [MAX8997_CHARGER] = &charger_current_map_desc,
136 [MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc,
137 };
138
139 static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev,
140 unsigned int selector)
141 {
142 int rid = rdev_get_id(rdev);
143
144 if (rid != MAX8997_CHARGER_CV)
145 goto err;
146
147 switch (selector) {
148 case 0x00:
149 return 4200000;
150 case 0x01 ... 0x0E:
151 return 4000000 + 20000 * (selector - 0x01);
152 case 0x0F:
153 return 4350000;
154 default:
155 return -EINVAL;
156 }
157 err:
158 return -EINVAL;
159 }
160
161 static int max8997_list_voltage(struct regulator_dev *rdev,
162 unsigned int selector)
163 {
164 const struct voltage_map_desc *desc;
165 int rid = rdev_get_id(rdev);
166 int val;
167
168 if (rid >= ARRAY_SIZE(reg_voltage_map) ||
169 rid < 0)
170 return -EINVAL;
171
172 desc = reg_voltage_map[rid];
173 if (desc == NULL)
174 return -EINVAL;
175
176 val = desc->min + desc->step * selector;
177 if (val > desc->max)
178 return -EINVAL;
179
180 return val;
181 }
182
183 static int max8997_get_enable_register(struct regulator_dev *rdev,
184 int *reg, int *mask, int *pattern)
185 {
186 int rid = rdev_get_id(rdev);
187
188 switch (rid) {
189 case MAX8997_LDO1 ... MAX8997_LDO21:
190 *reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
191 *mask = 0xC0;
192 *pattern = 0xC0;
193 break;
194 case MAX8997_BUCK1:
195 *reg = MAX8997_REG_BUCK1CTRL;
196 *mask = 0x01;
197 *pattern = 0x01;
198 break;
199 case MAX8997_BUCK2:
200 *reg = MAX8997_REG_BUCK2CTRL;
201 *mask = 0x01;
202 *pattern = 0x01;
203 break;
204 case MAX8997_BUCK3:
205 *reg = MAX8997_REG_BUCK3CTRL;
206 *mask = 0x01;
207 *pattern = 0x01;
208 break;
209 case MAX8997_BUCK4:
210 *reg = MAX8997_REG_BUCK4CTRL;
211 *mask = 0x01;
212 *pattern = 0x01;
213 break;
214 case MAX8997_BUCK5:
215 *reg = MAX8997_REG_BUCK5CTRL;
216 *mask = 0x01;
217 *pattern = 0x01;
218 break;
219 case MAX8997_BUCK6:
220 *reg = MAX8997_REG_BUCK6CTRL;
221 *mask = 0x01;
222 *pattern = 0x01;
223 break;
224 case MAX8997_BUCK7:
225 *reg = MAX8997_REG_BUCK7CTRL;
226 *mask = 0x01;
227 *pattern = 0x01;
228 break;
229 case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP:
230 *reg = MAX8997_REG_MAINCON1;
231 *mask = 0x01 << (rid - MAX8997_EN32KHZ_AP);
232 *pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP);
233 break;
234 case MAX8997_ENVICHG:
235 *reg = MAX8997_REG_MBCCTRL1;
236 *mask = 0x80;
237 *pattern = 0x80;
238 break;
239 case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
240 *reg = MAX8997_REG_SAFEOUTCTRL;
241 *mask = 0x40 << (rid - MAX8997_ESAFEOUT1);
242 *pattern = 0x40 << (rid - MAX8997_ESAFEOUT1);
243 break;
244 case MAX8997_CHARGER:
245 *reg = MAX8997_REG_MBCCTRL2;
246 *mask = 0x40;
247 *pattern = 0x40;
248 break;
249 default:
250 /* Not controllable or not exists */
251 return -EINVAL;
252 }
253
254 return 0;
255 }
256
257 static int max8997_reg_is_enabled(struct regulator_dev *rdev)
258 {
259 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
260 struct i2c_client *i2c = max8997->iodev->i2c;
261 int ret, reg, mask, pattern;
262 u8 val;
263
264 ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
265 if (ret)
266 return ret;
267
268 ret = max8997_read_reg(i2c, reg, &val);
269 if (ret)
270 return ret;
271
272 return (val & mask) == pattern;
273 }
274
275 static int max8997_reg_enable(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
281 ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
282 if (ret)
283 return ret;
284
285 return max8997_update_reg(i2c, reg, pattern, mask);
286 }
287
288 static int max8997_reg_disable(struct regulator_dev *rdev)
289 {
290 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
291 struct i2c_client *i2c = max8997->iodev->i2c;
292 int ret, reg, mask, pattern;
293
294 ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
295 if (ret)
296 return ret;
297
298 return max8997_update_reg(i2c, reg, ~pattern, mask);
299 }
300
301 static int max8997_get_voltage_register(struct regulator_dev *rdev,
302 int *_reg, int *_shift, int *_mask)
303 {
304 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
305 int rid = rdev_get_id(rdev);
306 int reg, shift = 0, mask = 0x3f;
307
308 switch (rid) {
309 case MAX8997_LDO1 ... MAX8997_LDO21:
310 reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
311 break;
312 case MAX8997_BUCK1:
313 reg = MAX8997_REG_BUCK1DVS1;
314 if (max8997->buck1_gpiodvs)
315 reg += max8997->buck125_gpioindex;
316 break;
317 case MAX8997_BUCK2:
318 reg = MAX8997_REG_BUCK2DVS1;
319 if (max8997->buck2_gpiodvs)
320 reg += max8997->buck125_gpioindex;
321 break;
322 case MAX8997_BUCK3:
323 reg = MAX8997_REG_BUCK3DVS;
324 break;
325 case MAX8997_BUCK4:
326 reg = MAX8997_REG_BUCK4DVS;
327 break;
328 case MAX8997_BUCK5:
329 reg = MAX8997_REG_BUCK5DVS1;
330 if (max8997->buck5_gpiodvs)
331 reg += max8997->buck125_gpioindex;
332 break;
333 case MAX8997_BUCK7:
334 reg = MAX8997_REG_BUCK7DVS;
335 break;
336 case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
337 reg = MAX8997_REG_SAFEOUTCTRL;
338 shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0;
339 mask = 0x3;
340 break;
341 case MAX8997_CHARGER_CV:
342 reg = MAX8997_REG_MBCCTRL3;
343 shift = 0;
344 mask = 0xf;
345 break;
346 case MAX8997_CHARGER:
347 reg = MAX8997_REG_MBCCTRL4;
348 shift = 0;
349 mask = 0xf;
350 break;
351 case MAX8997_CHARGER_TOPOFF:
352 reg = MAX8997_REG_MBCCTRL5;
353 shift = 0;
354 mask = 0xf;
355 break;
356 default:
357 return -EINVAL;
358 }
359
360 *_reg = reg;
361 *_shift = shift;
362 *_mask = mask;
363
364 return 0;
365 }
366
367 static int max8997_get_voltage_sel(struct regulator_dev *rdev)
368 {
369 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
370 struct i2c_client *i2c = max8997->iodev->i2c;
371 int reg, shift, mask, ret;
372 u8 val;
373
374 ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
375 if (ret)
376 return ret;
377
378 ret = max8997_read_reg(i2c, reg, &val);
379 if (ret)
380 return ret;
381
382 val >>= shift;
383 val &= mask;
384
385 return val;
386 }
387
388 static inline int max8997_get_voltage_proper_val(
389 const struct voltage_map_desc *desc,
390 int min_vol, int max_vol)
391 {
392 int i;
393
394 if (desc == NULL)
395 return -EINVAL;
396
397 if (max_vol < desc->min || min_vol > desc->max)
398 return -EINVAL;
399
400 if (min_vol < desc->min)
401 min_vol = desc->min;
402
403 i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
404
405 if (desc->min + desc->step * i > max_vol)
406 return -EINVAL;
407
408 return i;
409 }
410
411 static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev,
412 int min_uV, int max_uV, unsigned *selector)
413 {
414 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
415 struct i2c_client *i2c = max8997->iodev->i2c;
416 int rid = rdev_get_id(rdev);
417 int lb, ub;
418 int reg, shift = 0, mask, ret = 0;
419 u8 val = 0x0;
420
421 if (rid != MAX8997_CHARGER_CV)
422 return -EINVAL;
423
424 ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
425 if (ret)
426 return ret;
427
428 if (max_uV < 4000000 || min_uV > 4350000)
429 return -EINVAL;
430
431 if (min_uV <= 4000000) {
432 if (max_uV >= 4000000)
433 return -EINVAL;
434 else
435 val = 0x1;
436 } else if (min_uV <= 4200000 && max_uV >= 4200000)
437 val = 0x0;
438 else {
439 lb = (min_uV - 4000001) / 20000 + 2;
440 ub = (max_uV - 4000000) / 20000 + 1;
441
442 if (lb > ub)
443 return -EINVAL;
444
445 if (lb < 0xf)
446 val = lb;
447 else {
448 if (ub >= 0xf)
449 val = 0xf;
450 else
451 return -EINVAL;
452 }
453 }
454
455 *selector = val;
456
457 ret = max8997_update_reg(i2c, reg, val << shift, mask);
458
459 return ret;
460 }
461
462 /*
463 * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
464 * BUCK1, 2, and 5 are available if they are not controlled by gpio
465 */
466 static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
467 int min_uV, int max_uV, unsigned *selector)
468 {
469 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
470 struct i2c_client *i2c = max8997->iodev->i2c;
471 const struct voltage_map_desc *desc;
472 int rid = rdev_get_id(rdev);
473 int i, reg, shift, mask, ret;
474
475 switch (rid) {
476 case MAX8997_LDO1 ... MAX8997_LDO21:
477 break;
478 case MAX8997_BUCK1 ... MAX8997_BUCK5:
479 break;
480 case MAX8997_BUCK6:
481 return -EINVAL;
482 case MAX8997_BUCK7:
483 break;
484 case MAX8997_CHARGER:
485 break;
486 case MAX8997_CHARGER_TOPOFF:
487 break;
488 default:
489 return -EINVAL;
490 }
491
492 desc = reg_voltage_map[rid];
493
494 i = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
495 if (i < 0)
496 return i;
497
498 ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
499 if (ret)
500 return ret;
501
502 ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
503 *selector = i;
504
505 return ret;
506 }
507
508 static int max8997_set_voltage_buck_time_sel(struct regulator_dev *rdev,
509 unsigned int old_selector,
510 unsigned int new_selector)
511 {
512 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
513 int rid = rdev_get_id(rdev);
514 const struct voltage_map_desc *desc = reg_voltage_map[rid];
515
516 /* Delay is required only if the voltage is increasing */
517 if (old_selector >= new_selector)
518 return 0;
519
520 /* No need to delay if gpio_dvs_mode */
521 switch (rid) {
522 case MAX8997_BUCK1:
523 if (max8997->buck1_gpiodvs)
524 return 0;
525 break;
526 case MAX8997_BUCK2:
527 if (max8997->buck2_gpiodvs)
528 return 0;
529 break;
530 case MAX8997_BUCK5:
531 if (max8997->buck5_gpiodvs)
532 return 0;
533 break;
534 }
535
536 switch (rid) {
537 case MAX8997_BUCK1:
538 case MAX8997_BUCK2:
539 case MAX8997_BUCK4:
540 case MAX8997_BUCK5:
541 return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
542 max8997->ramp_delay * 1000);
543 }
544
545 return 0;
546 }
547
548 /*
549 * Assess the damage on the voltage setting of BUCK1,2,5 by the change.
550 *
551 * When GPIO-DVS mode is used for multiple bucks, changing the voltage value
552 * of one of the bucks may affect that of another buck, which is the side
553 * effect of the change (set_voltage). This function examines the GPIO-DVS
554 * configurations and checks whether such side-effect exists.
555 */
556 static int max8997_assess_side_effect(struct regulator_dev *rdev,
557 u8 new_val, int *best)
558 {
559 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
560 int rid = rdev_get_id(rdev);
561 u8 *buckx_val[3];
562 bool buckx_gpiodvs[3];
563 int side_effect[8];
564 int min_side_effect = INT_MAX;
565 int i;
566
567 *best = -1;
568
569 switch (rid) {
570 case MAX8997_BUCK1:
571 rid = 0;
572 break;
573 case MAX8997_BUCK2:
574 rid = 1;
575 break;
576 case MAX8997_BUCK5:
577 rid = 2;
578 break;
579 default:
580 return -EINVAL;
581 }
582
583 buckx_val[0] = max8997->buck1_vol;
584 buckx_val[1] = max8997->buck2_vol;
585 buckx_val[2] = max8997->buck5_vol;
586 buckx_gpiodvs[0] = max8997->buck1_gpiodvs;
587 buckx_gpiodvs[1] = max8997->buck2_gpiodvs;
588 buckx_gpiodvs[2] = max8997->buck5_gpiodvs;
589
590 for (i = 0; i < 8; i++) {
591 int others;
592
593 if (new_val != (buckx_val[rid])[i]) {
594 side_effect[i] = -1;
595 continue;
596 }
597
598 side_effect[i] = 0;
599 for (others = 0; others < 3; others++) {
600 int diff;
601
602 if (others == rid)
603 continue;
604 if (buckx_gpiodvs[others] == false)
605 continue; /* Not affected */
606 diff = (buckx_val[others])[i] -
607 (buckx_val[others])[max8997->buck125_gpioindex];
608 if (diff > 0)
609 side_effect[i] += diff;
610 else if (diff < 0)
611 side_effect[i] -= diff;
612 }
613 if (side_effect[i] == 0) {
614 *best = i;
615 return 0; /* NO SIDE EFFECT! Use This! */
616 }
617 if (side_effect[i] < min_side_effect) {
618 min_side_effect = side_effect[i];
619 *best = i;
620 }
621 }
622
623 if (*best == -1)
624 return -EINVAL;
625
626 return side_effect[*best];
627 }
628
629 /*
630 * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
631 * max8997_set_voltage_ldobuck to do the job.
632 */
633 static int max8997_set_voltage_buck(struct regulator_dev *rdev,
634 int min_uV, int max_uV, unsigned *selector)
635 {
636 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
637 int rid = rdev_get_id(rdev);
638 const struct voltage_map_desc *desc;
639 int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
640 bool gpio_dvs_mode = false;
641
642 if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
643 return -EINVAL;
644
645 switch (rid) {
646 case MAX8997_BUCK1:
647 if (max8997->buck1_gpiodvs)
648 gpio_dvs_mode = true;
649 break;
650 case MAX8997_BUCK2:
651 if (max8997->buck2_gpiodvs)
652 gpio_dvs_mode = true;
653 break;
654 case MAX8997_BUCK5:
655 if (max8997->buck5_gpiodvs)
656 gpio_dvs_mode = true;
657 break;
658 }
659
660 if (!gpio_dvs_mode)
661 return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV,
662 selector);
663
664 desc = reg_voltage_map[rid];
665 new_val = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
666 if (new_val < 0)
667 return new_val;
668
669 tmp_dmg = INT_MAX;
670 tmp_idx = -1;
671 tmp_val = -1;
672 do {
673 damage = max8997_assess_side_effect(rdev, new_val, &new_idx);
674 if (damage == 0)
675 goto out;
676
677 if (tmp_dmg > damage) {
678 tmp_idx = new_idx;
679 tmp_val = new_val;
680 tmp_dmg = damage;
681 }
682
683 new_val++;
684 } while (desc->min + desc->step * new_val <= desc->max);
685
686 new_idx = tmp_idx;
687 new_val = tmp_val;
688
689 if (max8997->ignore_gpiodvs_side_effect == false)
690 return -EINVAL;
691
692 dev_warn(&rdev->dev,
693 "MAX8997 GPIO-DVS Side Effect Warning: GPIO SET: %d -> %d\n",
694 max8997->buck125_gpioindex, tmp_idx);
695
696 out:
697 if (new_idx < 0 || new_val < 0)
698 return -EINVAL;
699
700 max8997->buck125_gpioindex = new_idx;
701 max8997_set_gpio(max8997);
702 *selector = new_val;
703
704 return 0;
705 }
706
707 /* For SAFEOUT1 and SAFEOUT2 */
708 static int max8997_set_voltage_safeout_sel(struct regulator_dev *rdev,
709 unsigned selector)
710 {
711 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
712 struct i2c_client *i2c = max8997->iodev->i2c;
713 int rid = rdev_get_id(rdev);
714 int reg, shift = 0, mask, ret;
715
716 if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2)
717 return -EINVAL;
718
719 ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
720 if (ret)
721 return ret;
722
723 return max8997_update_reg(i2c, reg, selector << shift, mask << shift);
724 }
725
726 static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
727 {
728 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
729 struct i2c_client *i2c = max8997->iodev->i2c;
730 int ret, reg, mask, pattern;
731 int rid = rdev_get_id(rdev);
732
733 ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
734 if (ret)
735 return ret;
736
737 max8997_read_reg(i2c, reg, &max8997->saved_states[rid]);
738
739 if (rid == MAX8997_LDO1 ||
740 rid == MAX8997_LDO10 ||
741 rid == MAX8997_LDO21) {
742 dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n",
743 rdev->desc->name);
744 return max8997_update_reg(i2c, reg, 0x40, mask);
745 }
746
747 dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
748 rdev->desc->name, max8997->saved_states[rid] & mask,
749 (~pattern) & mask);
750 return max8997_update_reg(i2c, reg, ~pattern, mask);
751 }
752
753 static struct regulator_ops max8997_ldo_ops = {
754 .list_voltage = max8997_list_voltage,
755 .is_enabled = max8997_reg_is_enabled,
756 .enable = max8997_reg_enable,
757 .disable = max8997_reg_disable,
758 .get_voltage_sel = max8997_get_voltage_sel,
759 .set_voltage = max8997_set_voltage_ldobuck,
760 .set_suspend_disable = max8997_reg_disable_suspend,
761 };
762
763 static struct regulator_ops max8997_buck_ops = {
764 .list_voltage = max8997_list_voltage,
765 .is_enabled = max8997_reg_is_enabled,
766 .enable = max8997_reg_enable,
767 .disable = max8997_reg_disable,
768 .get_voltage_sel = max8997_get_voltage_sel,
769 .set_voltage = max8997_set_voltage_buck,
770 .set_voltage_time_sel = max8997_set_voltage_buck_time_sel,
771 .set_suspend_disable = max8997_reg_disable_suspend,
772 };
773
774 static struct regulator_ops max8997_fixedvolt_ops = {
775 .list_voltage = max8997_list_voltage,
776 .is_enabled = max8997_reg_is_enabled,
777 .enable = max8997_reg_enable,
778 .disable = max8997_reg_disable,
779 .set_suspend_disable = max8997_reg_disable_suspend,
780 };
781
782 static struct regulator_ops max8997_safeout_ops = {
783 .list_voltage = regulator_list_voltage_table,
784 .is_enabled = max8997_reg_is_enabled,
785 .enable = max8997_reg_enable,
786 .disable = max8997_reg_disable,
787 .get_voltage_sel = max8997_get_voltage_sel,
788 .set_voltage_sel = max8997_set_voltage_safeout_sel,
789 .set_suspend_disable = max8997_reg_disable_suspend,
790 };
791
792 static struct regulator_ops max8997_fixedstate_ops = {
793 .list_voltage = max8997_list_voltage_charger_cv,
794 .get_voltage_sel = max8997_get_voltage_sel,
795 .set_voltage = max8997_set_voltage_charger_cv,
796 };
797
798 static int max8997_set_current_limit(struct regulator_dev *rdev,
799 int min_uA, int max_uA)
800 {
801 unsigned dummy;
802 int rid = rdev_get_id(rdev);
803
804 if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
805 return -EINVAL;
806
807 /* Reuse max8997_set_voltage_ldobuck to set current_limit. */
808 return max8997_set_voltage_ldobuck(rdev, min_uA, max_uA, &dummy);
809 }
810
811 static int max8997_get_current_limit(struct regulator_dev *rdev)
812 {
813 int sel, rid = rdev_get_id(rdev);
814
815 if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
816 return -EINVAL;
817
818 sel = max8997_get_voltage_sel(rdev);
819 if (sel < 0)
820 return sel;
821
822 /* Reuse max8997_list_voltage to get current_limit. */
823 return max8997_list_voltage(rdev, sel);
824 }
825
826 static struct regulator_ops max8997_charger_ops = {
827 .is_enabled = max8997_reg_is_enabled,
828 .enable = max8997_reg_enable,
829 .disable = max8997_reg_disable,
830 .get_current_limit = max8997_get_current_limit,
831 .set_current_limit = max8997_set_current_limit,
832 };
833
834 static struct regulator_ops max8997_charger_fixedstate_ops = {
835 .get_current_limit = max8997_get_current_limit,
836 .set_current_limit = max8997_set_current_limit,
837 };
838
839 #define MAX8997_VOLTAGE_REGULATOR(_name, _ops) {\
840 .name = #_name, \
841 .id = MAX8997_##_name, \
842 .ops = &_ops, \
843 .type = REGULATOR_VOLTAGE, \
844 .owner = THIS_MODULE, \
845 }
846
847 #define MAX8997_CURRENT_REGULATOR(_name, _ops) {\
848 .name = #_name, \
849 .id = MAX8997_##_name, \
850 .ops = &_ops, \
851 .type = REGULATOR_CURRENT, \
852 .owner = THIS_MODULE, \
853 }
854
855 static struct regulator_desc regulators[] = {
856 MAX8997_VOLTAGE_REGULATOR(LDO1, max8997_ldo_ops),
857 MAX8997_VOLTAGE_REGULATOR(LDO2, max8997_ldo_ops),
858 MAX8997_VOLTAGE_REGULATOR(LDO3, max8997_ldo_ops),
859 MAX8997_VOLTAGE_REGULATOR(LDO4, max8997_ldo_ops),
860 MAX8997_VOLTAGE_REGULATOR(LDO5, max8997_ldo_ops),
861 MAX8997_VOLTAGE_REGULATOR(LDO6, max8997_ldo_ops),
862 MAX8997_VOLTAGE_REGULATOR(LDO7, max8997_ldo_ops),
863 MAX8997_VOLTAGE_REGULATOR(LDO8, max8997_ldo_ops),
864 MAX8997_VOLTAGE_REGULATOR(LDO9, max8997_ldo_ops),
865 MAX8997_VOLTAGE_REGULATOR(LDO10, max8997_ldo_ops),
866 MAX8997_VOLTAGE_REGULATOR(LDO11, max8997_ldo_ops),
867 MAX8997_VOLTAGE_REGULATOR(LDO12, max8997_ldo_ops),
868 MAX8997_VOLTAGE_REGULATOR(LDO13, max8997_ldo_ops),
869 MAX8997_VOLTAGE_REGULATOR(LDO14, max8997_ldo_ops),
870 MAX8997_VOLTAGE_REGULATOR(LDO15, max8997_ldo_ops),
871 MAX8997_VOLTAGE_REGULATOR(LDO16, max8997_ldo_ops),
872 MAX8997_VOLTAGE_REGULATOR(LDO17, max8997_ldo_ops),
873 MAX8997_VOLTAGE_REGULATOR(LDO18, max8997_ldo_ops),
874 MAX8997_VOLTAGE_REGULATOR(LDO21, max8997_ldo_ops),
875 MAX8997_VOLTAGE_REGULATOR(BUCK1, max8997_buck_ops),
876 MAX8997_VOLTAGE_REGULATOR(BUCK2, max8997_buck_ops),
877 MAX8997_VOLTAGE_REGULATOR(BUCK3, max8997_buck_ops),
878 MAX8997_VOLTAGE_REGULATOR(BUCK4, max8997_buck_ops),
879 MAX8997_VOLTAGE_REGULATOR(BUCK5, max8997_buck_ops),
880 MAX8997_VOLTAGE_REGULATOR(BUCK6, max8997_fixedvolt_ops),
881 MAX8997_VOLTAGE_REGULATOR(BUCK7, max8997_buck_ops),
882 MAX8997_VOLTAGE_REGULATOR(EN32KHZ_AP, max8997_fixedvolt_ops),
883 MAX8997_VOLTAGE_REGULATOR(EN32KHZ_CP, max8997_fixedvolt_ops),
884 MAX8997_VOLTAGE_REGULATOR(ENVICHG, max8997_fixedvolt_ops),
885 MAX8997_VOLTAGE_REGULATOR(ESAFEOUT1, max8997_safeout_ops),
886 MAX8997_VOLTAGE_REGULATOR(ESAFEOUT2, max8997_safeout_ops),
887 MAX8997_VOLTAGE_REGULATOR(CHARGER_CV, max8997_fixedstate_ops),
888 MAX8997_CURRENT_REGULATOR(CHARGER, max8997_charger_ops),
889 MAX8997_CURRENT_REGULATOR(CHARGER_TOPOFF,
890 max8997_charger_fixedstate_ops),
891 };
892
893 #ifdef CONFIG_OF
894 static int max8997_pmic_dt_parse_dvs_gpio(struct platform_device *pdev,
895 struct max8997_platform_data *pdata,
896 struct device_node *pmic_np)
897 {
898 int i, gpio;
899
900 for (i = 0; i < 3; i++) {
901 gpio = of_get_named_gpio(pmic_np,
902 "max8997,pmic-buck125-dvs-gpios", i);
903 if (!gpio_is_valid(gpio)) {
904 dev_err(&pdev->dev, "invalid gpio[%d]: %d\n", i, gpio);
905 return -EINVAL;
906 }
907 pdata->buck125_gpios[i] = gpio;
908 }
909 return 0;
910 }
911
912 static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
913 struct max8997_platform_data *pdata)
914 {
915 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
916 struct device_node *pmic_np, *regulators_np, *reg_np;
917 struct max8997_regulator_data *rdata;
918 unsigned int i, dvs_voltage_nr = 1, ret;
919
920 pmic_np = iodev->dev->of_node;
921 if (!pmic_np) {
922 dev_err(&pdev->dev, "could not find pmic sub-node\n");
923 return -ENODEV;
924 }
925
926 regulators_np = of_get_child_by_name(pmic_np, "regulators");
927 if (!regulators_np) {
928 dev_err(&pdev->dev, "could not find regulators sub-node\n");
929 return -EINVAL;
930 }
931
932 /* count the number of regulators to be supported in pmic */
933 pdata->num_regulators = of_get_child_count(regulators_np);
934
935 rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) *
936 pdata->num_regulators, GFP_KERNEL);
937 if (!rdata) {
938 of_node_put(regulators_np);
939 return -ENOMEM;
940 }
941
942 pdata->regulators = rdata;
943 for_each_child_of_node(regulators_np, reg_np) {
944 for (i = 0; i < ARRAY_SIZE(regulators); i++)
945 if (!of_node_cmp(reg_np->name, regulators[i].name))
946 break;
947
948 if (i == ARRAY_SIZE(regulators)) {
949 dev_warn(&pdev->dev, "don't know how to configure regulator %s\n",
950 reg_np->name);
951 continue;
952 }
953
954 rdata->id = i;
955 rdata->initdata = of_get_regulator_init_data(&pdev->dev,
956 reg_np,
957 &regulators[i]);
958 rdata->reg_node = reg_np;
959 rdata++;
960 }
961 of_node_put(regulators_np);
962
963 if (of_get_property(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs", NULL))
964 pdata->buck1_gpiodvs = true;
965
966 if (of_get_property(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs", NULL))
967 pdata->buck2_gpiodvs = true;
968
969 if (of_get_property(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs", NULL))
970 pdata->buck5_gpiodvs = true;
971
972 if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
973 pdata->buck5_gpiodvs) {
974 ret = max8997_pmic_dt_parse_dvs_gpio(pdev, pdata, pmic_np);
975 if (ret)
976 return -EINVAL;
977
978 if (of_property_read_u32(pmic_np,
979 "max8997,pmic-buck125-default-dvs-idx",
980 &pdata->buck125_default_idx)) {
981 pdata->buck125_default_idx = 0;
982 } else {
983 if (pdata->buck125_default_idx >= 8) {
984 pdata->buck125_default_idx = 0;
985 dev_info(&pdev->dev, "invalid value for default dvs index, using 0 instead\n");
986 }
987 }
988
989 if (of_get_property(pmic_np,
990 "max8997,pmic-ignore-gpiodvs-side-effect", NULL))
991 pdata->ignore_gpiodvs_side_effect = true;
992
993 dvs_voltage_nr = 8;
994 }
995
996 if (of_property_read_u32_array(pmic_np,
997 "max8997,pmic-buck1-dvs-voltage",
998 pdata->buck1_voltage, dvs_voltage_nr)) {
999 dev_err(&pdev->dev, "buck1 voltages not specified\n");
1000 return -EINVAL;
1001 }
1002
1003 if (of_property_read_u32_array(pmic_np,
1004 "max8997,pmic-buck2-dvs-voltage",
1005 pdata->buck2_voltage, dvs_voltage_nr)) {
1006 dev_err(&pdev->dev, "buck2 voltages not specified\n");
1007 return -EINVAL;
1008 }
1009
1010 if (of_property_read_u32_array(pmic_np,
1011 "max8997,pmic-buck5-dvs-voltage",
1012 pdata->buck5_voltage, dvs_voltage_nr)) {
1013 dev_err(&pdev->dev, "buck5 voltages not specified\n");
1014 return -EINVAL;
1015 }
1016
1017 return 0;
1018 }
1019 #else
1020 static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
1021 struct max8997_platform_data *pdata)
1022 {
1023 return 0;
1024 }
1025 #endif /* CONFIG_OF */
1026
1027 static int max8997_pmic_probe(struct platform_device *pdev)
1028 {
1029 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
1030 struct max8997_platform_data *pdata = iodev->pdata;
1031 struct regulator_config config = { };
1032 struct regulator_dev *rdev;
1033 struct max8997_data *max8997;
1034 struct i2c_client *i2c;
1035 int i, ret, nr_dvs;
1036 u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
1037
1038 if (!pdata) {
1039 dev_err(&pdev->dev, "No platform init data supplied.\n");
1040 return -ENODEV;
1041 }
1042
1043 if (iodev->dev->of_node) {
1044 ret = max8997_pmic_dt_parse_pdata(pdev, pdata);
1045 if (ret)
1046 return ret;
1047 }
1048
1049 max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
1050 GFP_KERNEL);
1051 if (!max8997)
1052 return -ENOMEM;
1053
1054 max8997->dev = &pdev->dev;
1055 max8997->iodev = iodev;
1056 max8997->num_regulators = pdata->num_regulators;
1057 platform_set_drvdata(pdev, max8997);
1058 i2c = max8997->iodev->i2c;
1059
1060 max8997->buck125_gpioindex = pdata->buck125_default_idx;
1061 max8997->buck1_gpiodvs = pdata->buck1_gpiodvs;
1062 max8997->buck2_gpiodvs = pdata->buck2_gpiodvs;
1063 max8997->buck5_gpiodvs = pdata->buck5_gpiodvs;
1064 memcpy(max8997->buck125_gpios, pdata->buck125_gpios, sizeof(int) * 3);
1065 max8997->ignore_gpiodvs_side_effect = pdata->ignore_gpiodvs_side_effect;
1066
1067 nr_dvs = (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1068 pdata->buck5_gpiodvs) ? 8 : 1;
1069
1070 for (i = 0; i < nr_dvs; i++) {
1071 max8997->buck1_vol[i] = ret =
1072 max8997_get_voltage_proper_val(
1073 &buck1245_voltage_map_desc,
1074 pdata->buck1_voltage[i],
1075 pdata->buck1_voltage[i] +
1076 buck1245_voltage_map_desc.step);
1077 if (ret < 0)
1078 return ret;
1079
1080 max8997->buck2_vol[i] = ret =
1081 max8997_get_voltage_proper_val(
1082 &buck1245_voltage_map_desc,
1083 pdata->buck2_voltage[i],
1084 pdata->buck2_voltage[i] +
1085 buck1245_voltage_map_desc.step);
1086 if (ret < 0)
1087 return ret;
1088
1089 max8997->buck5_vol[i] = ret =
1090 max8997_get_voltage_proper_val(
1091 &buck1245_voltage_map_desc,
1092 pdata->buck5_voltage[i],
1093 pdata->buck5_voltage[i] +
1094 buck1245_voltage_map_desc.step);
1095 if (ret < 0)
1096 return ret;
1097
1098 if (max_buck1 < max8997->buck1_vol[i])
1099 max_buck1 = max8997->buck1_vol[i];
1100 if (max_buck2 < max8997->buck2_vol[i])
1101 max_buck2 = max8997->buck2_vol[i];
1102 if (max_buck5 < max8997->buck5_vol[i])
1103 max_buck5 = max8997->buck5_vol[i];
1104 }
1105
1106 /* For the safety, set max voltage before setting up */
1107 for (i = 0; i < 8; i++) {
1108 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1109 max_buck1, 0x3f);
1110 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1111 max_buck2, 0x3f);
1112 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1113 max_buck5, 0x3f);
1114 }
1115
1116 /* Initialize all the DVS related BUCK registers */
1117 for (i = 0; i < nr_dvs; i++) {
1118 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1119 max8997->buck1_vol[i],
1120 0x3f);
1121 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1122 max8997->buck2_vol[i],
1123 0x3f);
1124 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1125 max8997->buck5_vol[i],
1126 0x3f);
1127 }
1128
1129 /*
1130 * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them.
1131 * If at least one of them cares, set gpios.
1132 */
1133 if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1134 pdata->buck5_gpiodvs) {
1135
1136 if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
1137 !gpio_is_valid(pdata->buck125_gpios[1]) ||
1138 !gpio_is_valid(pdata->buck125_gpios[2])) {
1139 dev_err(&pdev->dev, "GPIO NOT VALID\n");
1140 return -EINVAL;
1141 }
1142
1143 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[0],
1144 "MAX8997 SET1");
1145 if (ret)
1146 return ret;
1147
1148 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[1],
1149 "MAX8997 SET2");
1150 if (ret)
1151 return ret;
1152
1153 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[2],
1154 "MAX8997 SET3");
1155 if (ret)
1156 return ret;
1157
1158 gpio_direction_output(pdata->buck125_gpios[0],
1159 (max8997->buck125_gpioindex >> 2)
1160 & 0x1); /* SET1 */
1161 gpio_direction_output(pdata->buck125_gpios[1],
1162 (max8997->buck125_gpioindex >> 1)
1163 & 0x1); /* SET2 */
1164 gpio_direction_output(pdata->buck125_gpios[2],
1165 (max8997->buck125_gpioindex >> 0)
1166 & 0x1); /* SET3 */
1167 }
1168
1169 /* DVS-GPIO disabled */
1170 max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ?
1171 (1 << 1) : (0 << 1), 1 << 1);
1172 max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ?
1173 (1 << 1) : (0 << 1), 1 << 1);
1174 max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ?
1175 (1 << 1) : (0 << 1), 1 << 1);
1176
1177 /* Misc Settings */
1178 max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
1179 max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
1180
1181 for (i = 0; i < pdata->num_regulators; i++) {
1182 const struct voltage_map_desc *desc;
1183 int id = pdata->regulators[i].id;
1184
1185 desc = reg_voltage_map[id];
1186 if (desc) {
1187 regulators[id].n_voltages =
1188 (desc->max - desc->min) / desc->step + 1;
1189 } else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2) {
1190 regulators[id].volt_table = safeoutvolt;
1191 regulators[id].n_voltages = ARRAY_SIZE(safeoutvolt);
1192 } else if (id == MAX8997_CHARGER_CV) {
1193 regulators[id].n_voltages = 16;
1194 }
1195
1196 config.dev = max8997->dev;
1197 config.init_data = pdata->regulators[i].initdata;
1198 config.driver_data = max8997;
1199 config.of_node = pdata->regulators[i].reg_node;
1200
1201 rdev = devm_regulator_register(&pdev->dev, &regulators[id],
1202 &config);
1203 if (IS_ERR(rdev)) {
1204 dev_err(max8997->dev, "regulator init failed for %d\n",
1205 id);
1206 return PTR_ERR(rdev);
1207 }
1208 }
1209
1210 return 0;
1211 }
1212
1213 static const struct platform_device_id max8997_pmic_id[] = {
1214 { "max8997-pmic", 0},
1215 { },
1216 };
1217 MODULE_DEVICE_TABLE(platform, max8997_pmic_id);
1218
1219 static struct platform_driver max8997_pmic_driver = {
1220 .driver = {
1221 .name = "max8997-pmic",
1222 },
1223 .probe = max8997_pmic_probe,
1224 .id_table = max8997_pmic_id,
1225 };
1226
1227 static int __init max8997_pmic_init(void)
1228 {
1229 return platform_driver_register(&max8997_pmic_driver);
1230 }
1231 subsys_initcall(max8997_pmic_init);
1232
1233 static void __exit max8997_pmic_cleanup(void)
1234 {
1235 platform_driver_unregister(&max8997_pmic_driver);
1236 }
1237 module_exit(max8997_pmic_cleanup);
1238
1239 MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver");
1240 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1241 MODULE_LICENSE("GPL");
Linux with added FPC-III support