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1/*
2 * max8998.c - Voltage regulator driver for the Maxim 8998
3 *
4 * Copyright (C) 2009-2010 Samsung Electronics
5 * Kyungmin Park <kyungmin.park@samsung.com>
6 * Marek Szyprowski <m.szyprowski@samsung.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/i2c.h>
26#include <linux/err.h>
27#include <linux/gpio.h>
28#include <linux/slab.h>
29#include <linux/interrupt.h>
30#include <linux/mutex.h>
31#include <linux/delay.h>
32#include <linux/platform_device.h>
33#include <linux/regulator/driver.h>
34#include <linux/mfd/max8998.h>
35#include <linux/mfd/max8998-private.h>
36
37struct max8998_data {
38 struct device *dev;
39 struct max8998_dev *iodev;
40 int num_regulators;
41 struct regulator_dev **rdev;
42 u8 buck1_vol[4]; /* voltages for selection */
43 u8 buck2_vol[2];
44 unsigned int buck1_idx; /* index to last changed voltage */
45 /* value in a set */
46 unsigned int buck2_idx;
47};
48
49struct voltage_map_desc {
50 int min;
51 int max;
52 int step;
53};
54
55/* Voltage maps */
56static const struct voltage_map_desc ldo23_voltage_map_desc = {
57 .min = 800, .step = 50, .max = 1300,
58};
59static const struct voltage_map_desc ldo456711_voltage_map_desc = {
60 .min = 1600, .step = 100, .max = 3600,
61};
62static const struct voltage_map_desc ldo8_voltage_map_desc = {
63 .min = 3000, .step = 100, .max = 3600,
64};
65static const struct voltage_map_desc ldo9_voltage_map_desc = {
66 .min = 2800, .step = 100, .max = 3100,
67};
68static const struct voltage_map_desc ldo10_voltage_map_desc = {
69 .min = 950, .step = 50, .max = 1300,
70};
71static const struct voltage_map_desc ldo1213_voltage_map_desc = {
72 .min = 800, .step = 100, .max = 3300,
73};
74static const struct voltage_map_desc ldo1415_voltage_map_desc = {
75 .min = 1200, .step = 100, .max = 3300,
76};
77static const struct voltage_map_desc ldo1617_voltage_map_desc = {
78 .min = 1600, .step = 100, .max = 3600,
79};
80static const struct voltage_map_desc buck12_voltage_map_desc = {
81 .min = 750, .step = 25, .max = 1525,
82};
83static const struct voltage_map_desc buck3_voltage_map_desc = {
84 .min = 1600, .step = 100, .max = 3600,
85};
86static const struct voltage_map_desc buck4_voltage_map_desc = {
87 .min = 800, .step = 100, .max = 2300,
88};
89
90static const struct voltage_map_desc *ldo_voltage_map[] = {
91 NULL,
92 NULL,
93 &ldo23_voltage_map_desc, /* LDO2 */
94 &ldo23_voltage_map_desc, /* LDO3 */
95 &ldo456711_voltage_map_desc, /* LDO4 */
96 &ldo456711_voltage_map_desc, /* LDO5 */
97 &ldo456711_voltage_map_desc, /* LDO6 */
98 &ldo456711_voltage_map_desc, /* LDO7 */
99 &ldo8_voltage_map_desc, /* LDO8 */
100 &ldo9_voltage_map_desc, /* LDO9 */
101 &ldo10_voltage_map_desc, /* LDO10 */
102 &ldo456711_voltage_map_desc, /* LDO11 */
103 &ldo1213_voltage_map_desc, /* LDO12 */
104 &ldo1213_voltage_map_desc, /* LDO13 */
105 &ldo1415_voltage_map_desc, /* LDO14 */
106 &ldo1415_voltage_map_desc, /* LDO15 */
107 &ldo1617_voltage_map_desc, /* LDO16 */
108 &ldo1617_voltage_map_desc, /* LDO17 */
109 &buck12_voltage_map_desc, /* BUCK1 */
110 &buck12_voltage_map_desc, /* BUCK2 */
111 &buck3_voltage_map_desc, /* BUCK3 */
112 &buck4_voltage_map_desc, /* BUCK4 */
113};
114
115static inline int max8998_get_ldo(struct regulator_dev *rdev)
116{
117 return rdev_get_id(rdev);
118}
119
120static int max8998_list_voltage(struct regulator_dev *rdev,
121 unsigned int selector)
122{
123 const struct voltage_map_desc *desc;
124 int ldo = max8998_get_ldo(rdev);
125 int val;
126
127 if (ldo >= ARRAY_SIZE(ldo_voltage_map))
128 return -EINVAL;
129
130 desc = ldo_voltage_map[ldo];
131 if (desc == NULL)
132 return -EINVAL;
133
134 val = desc->min + desc->step * selector;
135 if (val > desc->max)
136 return -EINVAL;
137
138 return val * 1000;
139}
140
141static int max8998_get_enable_register(struct regulator_dev *rdev,
142 int *reg, int *shift)
143{
144 int ldo = max8998_get_ldo(rdev);
145
146 switch (ldo) {
147 case MAX8998_LDO2 ... MAX8998_LDO5:
148 *reg = MAX8998_REG_ONOFF1;
149 *shift = 3 - (ldo - MAX8998_LDO2);
150 break;
151 case MAX8998_LDO6 ... MAX8998_LDO13:
152 *reg = MAX8998_REG_ONOFF2;
153 *shift = 7 - (ldo - MAX8998_LDO6);
154 break;
155 case MAX8998_LDO14 ... MAX8998_LDO17:
156 *reg = MAX8998_REG_ONOFF3;
157 *shift = 7 - (ldo - MAX8998_LDO14);
158 break;
159 case MAX8998_BUCK1 ... MAX8998_BUCK4:
160 *reg = MAX8998_REG_ONOFF1;
161 *shift = 7 - (ldo - MAX8998_BUCK1);
162 break;
163 case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
164 *reg = MAX8998_REG_ONOFF4;
165 *shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
166 break;
167 case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
168 *reg = MAX8998_REG_CHGR2;
169 *shift = 7 - (ldo - MAX8998_ESAFEOUT1);
170 break;
171 default:
172 return -EINVAL;
173 }
174
175 return 0;
176}
177
178static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
179{
180 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
181 struct i2c_client *i2c = max8998->iodev->i2c;
182 int ret, reg, shift = 8;
183 u8 val;
184
185 ret = max8998_get_enable_register(rdev, ®, &shift);
186 if (ret)
187 return ret;
188
189 ret = max8998_read_reg(i2c, reg, &val);
190 if (ret)
191 return ret;
192
193 return val & (1 << shift);
194}
195
196static int max8998_ldo_enable(struct regulator_dev *rdev)
197{
198 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
199 struct i2c_client *i2c = max8998->iodev->i2c;
200 int reg, shift = 8, ret;
201
202 ret = max8998_get_enable_register(rdev, ®, &shift);
203 if (ret)
204 return ret;
205
206 return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
207}
208
209static int max8998_ldo_disable(struct regulator_dev *rdev)
210{
211 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
212 struct i2c_client *i2c = max8998->iodev->i2c;
213 int reg, shift = 8, ret;
214
215 ret = max8998_get_enable_register(rdev, ®, &shift);
216 if (ret)
217 return ret;
218
219 return max8998_update_reg(i2c, reg, 0, 1<<shift);
220}
221
222static int max8998_get_voltage_register(struct regulator_dev *rdev,
223 int *_reg, int *_shift, int *_mask)
224{
225 int ldo = max8998_get_ldo(rdev);
226 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
227 int reg, shift = 0, mask = 0xff;
228
229 switch (ldo) {
230 case MAX8998_LDO2 ... MAX8998_LDO3:
231 reg = MAX8998_REG_LDO2_LDO3;
232 mask = 0xf;
233 if (ldo == MAX8998_LDO2)
234 shift = 4;
235 else
236 shift = 0;
237 break;
238 case MAX8998_LDO4 ... MAX8998_LDO7:
239 reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
240 break;
241 case MAX8998_LDO8 ... MAX8998_LDO9:
242 reg = MAX8998_REG_LDO8_LDO9;
243 mask = 0xf;
244 if (ldo == MAX8998_LDO8)
245 shift = 4;
246 else
247 shift = 0;
248 break;
249 case MAX8998_LDO10 ... MAX8998_LDO11:
250 reg = MAX8998_REG_LDO10_LDO11;
251 if (ldo == MAX8998_LDO10) {
252 shift = 5;
253 mask = 0x7;
254 } else {
255 shift = 0;
256 mask = 0x1f;
257 }
258 break;
259 case MAX8998_LDO12 ... MAX8998_LDO17:
260 reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
261 break;
262 case MAX8998_BUCK1:
263 reg = MAX8998_REG_BUCK1_VOLTAGE1 + max8998->buck1_idx;
264 break;
265 case MAX8998_BUCK2:
266 reg = MAX8998_REG_BUCK2_VOLTAGE1 + max8998->buck2_idx;
267 break;
268 case MAX8998_BUCK3:
269 reg = MAX8998_REG_BUCK3;
270 break;
271 case MAX8998_BUCK4:
272 reg = MAX8998_REG_BUCK4;
273 break;
274 default:
275 return -EINVAL;
276 }
277
278 *_reg = reg;
279 *_shift = shift;
280 *_mask = mask;
281
282 return 0;
283}
284
285static int max8998_get_voltage(struct regulator_dev *rdev)
286{
287 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
288 struct i2c_client *i2c = max8998->iodev->i2c;
289 int reg, shift = 0, mask, ret;
290 u8 val;
291
292 ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
293 if (ret)
294 return ret;
295
296 ret = max8998_read_reg(i2c, reg, &val);
297 if (ret)
298 return ret;
299
300 val >>= shift;
301 val &= mask;
302
303 return max8998_list_voltage(rdev, val);
304}
305
306static int max8998_set_voltage_ldo(struct regulator_dev *rdev,
307 int min_uV, int max_uV, unsigned *selector)
308{
309 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
310 struct i2c_client *i2c = max8998->iodev->i2c;
311 int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
312 const struct voltage_map_desc *desc;
313 int ldo = max8998_get_ldo(rdev);
314 int reg, shift = 0, mask, ret;
315 int i = 0;
316
317 if (ldo >= ARRAY_SIZE(ldo_voltage_map))
318 return -EINVAL;
319
320 desc = ldo_voltage_map[ldo];
321 if (desc == NULL)
322 return -EINVAL;
323
324 if (max_vol < desc->min || min_vol > desc->max)
325 return -EINVAL;
326
327 while (desc->min + desc->step*i < min_vol &&
328 desc->min + desc->step*i < desc->max)
329 i++;
330
331 if (desc->min + desc->step*i > max_vol)
332 return -EINVAL;
333
334 *selector = i;
335
336 ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
337 if (ret)
338 return ret;
339
340 ret = max8998_update_reg(i2c, reg, i<<shift, mask<<shift);
341
342 return ret;
343}
344
345static inline void buck1_gpio_set(int gpio1, int gpio2, int v)
346{
347 gpio_set_value(gpio1, v & 0x1);
348 gpio_set_value(gpio2, (v >> 1) & 0x1);
349}
350
351static inline void buck2_gpio_set(int gpio, int v)
352{
353 gpio_set_value(gpio, v & 0x1);
354}
355
356static int max8998_set_voltage_buck(struct regulator_dev *rdev,
357 int min_uV, int max_uV, unsigned *selector)
358{
359 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
360 struct max8998_platform_data *pdata =
361 dev_get_platdata(max8998->iodev->dev);
362 struct i2c_client *i2c = max8998->iodev->i2c;
363 int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
364 const struct voltage_map_desc *desc;
365 int buck = max8998_get_ldo(rdev);
366 int reg, shift = 0, mask, ret;
367 int difference = 0, i = 0, j = 0, previous_vol = 0;
368 u8 val = 0;
369 static u8 buck1_last_val;
370
371 if (buck >= ARRAY_SIZE(ldo_voltage_map))
372 return -EINVAL;
373
374 desc = ldo_voltage_map[buck];
375
376 if (desc == NULL)
377 return -EINVAL;
378
379 if (max_vol < desc->min || min_vol > desc->max)
380 return -EINVAL;
381
382 while (desc->min + desc->step*i < min_vol &&
383 desc->min + desc->step*i < desc->max)
384 i++;
385
386 if (desc->min + desc->step*i > max_vol)
387 return -EINVAL;
388
389 *selector = i;
390
391 ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
392 if (ret)
393 return ret;
394
395 previous_vol = max8998_get_voltage(rdev);
396
397 /* Check if voltage needs to be changed */
398 /* if previous_voltage equal new voltage, return */
399 if (previous_vol == max8998_list_voltage(rdev, i)) {
400 dev_dbg(max8998->dev, "No voltage change, old:%d, new:%d\n",
401 previous_vol, max8998_list_voltage(rdev, i));
402 return ret;
403 }
404
405 switch (buck) {
406 case MAX8998_BUCK1:
407 dev_dbg(max8998->dev,
408 "BUCK1, i:%d, buck1_vol1:%d, buck1_vol2:%d\n"
409 "buck1_vol3:%d, buck1_vol4:%d\n",
410 i, max8998->buck1_vol[0], max8998->buck1_vol[1],
411 max8998->buck1_vol[2], max8998->buck1_vol[3]);
412
413 if (gpio_is_valid(pdata->buck1_set1) &&
414 gpio_is_valid(pdata->buck1_set2)) {
415
416 /* check if requested voltage */
417 /* value is already defined */
418 for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
419 if (max8998->buck1_vol[j] == i) {
420 max8998->buck1_idx = j;
421 buck1_gpio_set(pdata->buck1_set1,
422 pdata->buck1_set2, j);
423 goto buck1_exit;
424 }
425 }
426
427 if (pdata->buck_voltage_lock)
428 return -EINVAL;
429
430 /* no predefine regulator found */
431 max8998->buck1_idx = (buck1_last_val % 2) + 2;
432 dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
433 max8998->buck1_idx);
434 max8998->buck1_vol[max8998->buck1_idx] = i;
435 ret = max8998_get_voltage_register(rdev, ®,
436 &shift,
437 &mask);
438 ret = max8998_write_reg(i2c, reg, i);
439 buck1_gpio_set(pdata->buck1_set1,
440 pdata->buck1_set2, max8998->buck1_idx);
441 buck1_last_val++;
442buck1_exit:
443 dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
444 i2c->name, gpio_get_value(pdata->buck1_set1),
445 gpio_get_value(pdata->buck1_set2));
446 break;
447 } else {
448 ret = max8998_write_reg(i2c, reg, i);
449 }
450 break;
451
452 case MAX8998_BUCK2:
453 dev_dbg(max8998->dev,
454 "BUCK2, i:%d buck2_vol1:%d, buck2_vol2:%d\n"
455 , i, max8998->buck2_vol[0], max8998->buck2_vol[1]);
456 if (gpio_is_valid(pdata->buck2_set3)) {
457
458 /* check if requested voltage */
459 /* value is already defined */
460 for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
461 if (max8998->buck2_vol[j] == i) {
462 max8998->buck2_idx = j;
463 buck2_gpio_set(pdata->buck2_set3, j);
464 goto buck2_exit;
465 }
466 }
467
468 if (pdata->buck_voltage_lock)
469 return -EINVAL;
470
471 max8998_get_voltage_register(rdev,
472 ®, &shift, &mask);
473 ret = max8998_write_reg(i2c, reg, i);
474 max8998->buck2_vol[max8998->buck2_idx] = i;
475 buck2_gpio_set(pdata->buck2_set3, max8998->buck2_idx);
476buck2_exit:
477 dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
478 gpio_get_value(pdata->buck2_set3));
479 } else {
480 ret = max8998_write_reg(i2c, reg, i);
481 }
482 break;
483
484 case MAX8998_BUCK3:
485 case MAX8998_BUCK4:
486 ret = max8998_update_reg(i2c, reg, i<<shift, mask<<shift);
487 break;
488 }
489
490 /* Voltage stabilization */
491 max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
492
493 /* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
494 /* MAX8998 has ENRAMP bit implemented, so test it*/
495 if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
496 return ret;
497
498 difference = desc->min + desc->step*i - previous_vol/1000;
499 if (difference > 0)
500 udelay(difference / ((val & 0x0f) + 1));
501
502 return ret;
503}
504
505static struct regulator_ops max8998_ldo_ops = {
506 .list_voltage = max8998_list_voltage,
507 .is_enabled = max8998_ldo_is_enabled,
508 .enable = max8998_ldo_enable,
509 .disable = max8998_ldo_disable,
510 .get_voltage = max8998_get_voltage,
511 .set_voltage = max8998_set_voltage_ldo,
512 .set_suspend_enable = max8998_ldo_enable,
513 .set_suspend_disable = max8998_ldo_disable,
514};
515
516static struct regulator_ops max8998_buck_ops = {
517 .list_voltage = max8998_list_voltage,
518 .is_enabled = max8998_ldo_is_enabled,
519 .enable = max8998_ldo_enable,
520 .disable = max8998_ldo_disable,
521 .get_voltage = max8998_get_voltage,
522 .set_voltage = max8998_set_voltage_buck,
523 .set_suspend_enable = max8998_ldo_enable,
524 .set_suspend_disable = max8998_ldo_disable,
525};
526
527static struct regulator_ops max8998_others_ops = {
528 .is_enabled = max8998_ldo_is_enabled,
529 .enable = max8998_ldo_enable,
530 .disable = max8998_ldo_disable,
531 .set_suspend_enable = max8998_ldo_enable,
532 .set_suspend_disable = max8998_ldo_disable,
533};
534
535static struct regulator_desc regulators[] = {
536 {
537 .name = "LDO2",
538 .id = MAX8998_LDO2,
539 .ops = &max8998_ldo_ops,
540 .type = REGULATOR_VOLTAGE,
541 .owner = THIS_MODULE,
542 }, {
543 .name = "LDO3",
544 .id = MAX8998_LDO3,
545 .ops = &max8998_ldo_ops,
546 .type = REGULATOR_VOLTAGE,
547 .owner = THIS_MODULE,
548 }, {
549 .name = "LDO4",
550 .id = MAX8998_LDO4,
551 .ops = &max8998_ldo_ops,
552 .type = REGULATOR_VOLTAGE,
553 .owner = THIS_MODULE,
554 }, {
555 .name = "LDO5",
556 .id = MAX8998_LDO5,
557 .ops = &max8998_ldo_ops,
558 .type = REGULATOR_VOLTAGE,
559 .owner = THIS_MODULE,
560 }, {
561 .name = "LDO6",
562 .id = MAX8998_LDO6,
563 .ops = &max8998_ldo_ops,
564 .type = REGULATOR_VOLTAGE,
565 .owner = THIS_MODULE,
566 }, {
567 .name = "LDO7",
568 .id = MAX8998_LDO7,
569 .ops = &max8998_ldo_ops,
570 .type = REGULATOR_VOLTAGE,
571 .owner = THIS_MODULE,
572 }, {
573 .name = "LDO8",
574 .id = MAX8998_LDO8,
575 .ops = &max8998_ldo_ops,
576 .type = REGULATOR_VOLTAGE,
577 .owner = THIS_MODULE,
578 }, {
579 .name = "LDO9",
580 .id = MAX8998_LDO9,
581 .ops = &max8998_ldo_ops,
582 .type = REGULATOR_VOLTAGE,
583 .owner = THIS_MODULE,
584 }, {
585 .name = "LDO10",
586 .id = MAX8998_LDO10,
587 .ops = &max8998_ldo_ops,
588 .type = REGULATOR_VOLTAGE,
589 .owner = THIS_MODULE,
590 }, {
591 .name = "LDO11",
592 .id = MAX8998_LDO11,
593 .ops = &max8998_ldo_ops,
594 .type = REGULATOR_VOLTAGE,
595 .owner = THIS_MODULE,
596 }, {
597 .name = "LDO12",
598 .id = MAX8998_LDO12,
599 .ops = &max8998_ldo_ops,
600 .type = REGULATOR_VOLTAGE,
601 .owner = THIS_MODULE,
602 }, {
603 .name = "LDO13",
604 .id = MAX8998_LDO13,
605 .ops = &max8998_ldo_ops,
606 .type = REGULATOR_VOLTAGE,
607 .owner = THIS_MODULE,
608 }, {
609 .name = "LDO14",
610 .id = MAX8998_LDO14,
611 .ops = &max8998_ldo_ops,
612 .type = REGULATOR_VOLTAGE,
613 .owner = THIS_MODULE,
614 }, {
615 .name = "LDO15",
616 .id = MAX8998_LDO15,
617 .ops = &max8998_ldo_ops,
618 .type = REGULATOR_VOLTAGE,
619 .owner = THIS_MODULE,
620 }, {
621 .name = "LDO16",
622 .id = MAX8998_LDO16,
623 .ops = &max8998_ldo_ops,
624 .type = REGULATOR_VOLTAGE,
625 .owner = THIS_MODULE,
626 }, {
627 .name = "LDO17",
628 .id = MAX8998_LDO17,
629 .ops = &max8998_ldo_ops,
630 .type = REGULATOR_VOLTAGE,
631 .owner = THIS_MODULE,
632 }, {
633 .name = "BUCK1",
634 .id = MAX8998_BUCK1,
635 .ops = &max8998_buck_ops,
636 .type = REGULATOR_VOLTAGE,
637 .owner = THIS_MODULE,
638 }, {
639 .name = "BUCK2",
640 .id = MAX8998_BUCK2,
641 .ops = &max8998_buck_ops,
642 .type = REGULATOR_VOLTAGE,
643 .owner = THIS_MODULE,
644 }, {
645 .name = "BUCK3",
646 .id = MAX8998_BUCK3,
647 .ops = &max8998_buck_ops,
648 .type = REGULATOR_VOLTAGE,
649 .owner = THIS_MODULE,
650 }, {
651 .name = "BUCK4",
652 .id = MAX8998_BUCK4,
653 .ops = &max8998_buck_ops,
654 .type = REGULATOR_VOLTAGE,
655 .owner = THIS_MODULE,
656 }, {
657 .name = "EN32KHz AP",
658 .id = MAX8998_EN32KHZ_AP,
659 .ops = &max8998_others_ops,
660 .type = REGULATOR_VOLTAGE,
661 .owner = THIS_MODULE,
662 }, {
663 .name = "EN32KHz CP",
664 .id = MAX8998_EN32KHZ_CP,
665 .ops = &max8998_others_ops,
666 .type = REGULATOR_VOLTAGE,
667 .owner = THIS_MODULE,
668 }, {
669 .name = "ENVICHG",
670 .id = MAX8998_ENVICHG,
671 .ops = &max8998_others_ops,
672 .type = REGULATOR_VOLTAGE,
673 .owner = THIS_MODULE,
674 }, {
675 .name = "ESAFEOUT1",
676 .id = MAX8998_ESAFEOUT1,
677 .ops = &max8998_others_ops,
678 .type = REGULATOR_VOLTAGE,
679 .owner = THIS_MODULE,
680 }, {
681 .name = "ESAFEOUT2",
682 .id = MAX8998_ESAFEOUT2,
683 .ops = &max8998_others_ops,
684 .type = REGULATOR_VOLTAGE,
685 .owner = THIS_MODULE,
686 }
687};
688
689static __devinit int max8998_pmic_probe(struct platform_device *pdev)
690{
691 struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
692 struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
693 struct regulator_dev **rdev;
694 struct max8998_data *max8998;
695 struct i2c_client *i2c;
696 int i, ret, size;
697
698 if (!pdata) {
699 dev_err(pdev->dev.parent, "No platform init data supplied\n");
700 return -ENODEV;
701 }
702
703 max8998 = kzalloc(sizeof(struct max8998_data), GFP_KERNEL);
704 if (!max8998)
705 return -ENOMEM;
706
707 size = sizeof(struct regulator_dev *) * pdata->num_regulators;
708 max8998->rdev = kzalloc(size, GFP_KERNEL);
709 if (!max8998->rdev) {
710 kfree(max8998);
711 return -ENOMEM;
712 }
713
714 rdev = max8998->rdev;
715 max8998->dev = &pdev->dev;
716 max8998->iodev = iodev;
717 max8998->num_regulators = pdata->num_regulators;
718 platform_set_drvdata(pdev, max8998);
719 i2c = max8998->iodev->i2c;
720
721 max8998->buck1_idx = pdata->buck1_default_idx;
722 max8998->buck2_idx = pdata->buck2_default_idx;
723
724 /* NOTE: */
725 /* For unused GPIO NOT marked as -1 (thereof equal to 0) WARN_ON */
726 /* will be displayed */
727
728 /* Check if MAX8998 voltage selection GPIOs are defined */
729 if (gpio_is_valid(pdata->buck1_set1) &&
730 gpio_is_valid(pdata->buck1_set2)) {
731 /* Check if SET1 is not equal to 0 */
732 if (!pdata->buck1_set1) {
733 printk(KERN_ERR "MAX8998 SET1 GPIO defined as 0 !\n");
734 WARN_ON(!pdata->buck1_set1);
735 ret = -EIO;
736 goto err_free_mem;
737 }
738 /* Check if SET2 is not equal to 0 */
739 if (!pdata->buck1_set2) {
740 printk(KERN_ERR "MAX8998 SET2 GPIO defined as 0 !\n");
741 WARN_ON(!pdata->buck1_set2);
742 ret = -EIO;
743 goto err_free_mem;
744 }
745
746 gpio_request(pdata->buck1_set1, "MAX8998 BUCK1_SET1");
747 gpio_direction_output(pdata->buck1_set1,
748 max8998->buck1_idx & 0x1);
749
750
751 gpio_request(pdata->buck1_set2, "MAX8998 BUCK1_SET2");
752 gpio_direction_output(pdata->buck1_set2,
753 (max8998->buck1_idx >> 1) & 0x1);
754 /* Set predefined value for BUCK1 register 1 */
755 i = 0;
756 while (buck12_voltage_map_desc.min +
757 buck12_voltage_map_desc.step*i
758 < (pdata->buck1_voltage1 / 1000))
759 i++;
760 max8998->buck1_vol[0] = i;
761 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE1, i);
762 if (ret)
763 goto err_free_mem;
764
765 /* Set predefined value for BUCK1 register 2 */
766 i = 0;
767 while (buck12_voltage_map_desc.min +
768 buck12_voltage_map_desc.step*i
769 < (pdata->buck1_voltage2 / 1000))
770 i++;
771
772 max8998->buck1_vol[1] = i;
773 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE2, i);
774 if (ret)
775 goto err_free_mem;
776
777 /* Set predefined value for BUCK1 register 3 */
778 i = 0;
779 while (buck12_voltage_map_desc.min +
780 buck12_voltage_map_desc.step*i
781 < (pdata->buck1_voltage3 / 1000))
782 i++;
783
784 max8998->buck1_vol[2] = i;
785 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE3, i);
786 if (ret)
787 goto err_free_mem;
788
789 /* Set predefined value for BUCK1 register 4 */
790 i = 0;
791 while (buck12_voltage_map_desc.min +
792 buck12_voltage_map_desc.step*i
793 < (pdata->buck1_voltage4 / 1000))
794 i++;
795
796 max8998->buck1_vol[3] = i;
797 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE4, i);
798 if (ret)
799 goto err_free_mem;
800
801 }
802
803 if (gpio_is_valid(pdata->buck2_set3)) {
804 /* Check if SET3 is not equal to 0 */
805 if (!pdata->buck2_set3) {
806 printk(KERN_ERR "MAX8998 SET3 GPIO defined as 0 !\n");
807 WARN_ON(!pdata->buck2_set3);
808 ret = -EIO;
809 goto err_free_mem;
810 }
811 gpio_request(pdata->buck2_set3, "MAX8998 BUCK2_SET3");
812 gpio_direction_output(pdata->buck2_set3,
813 max8998->buck2_idx & 0x1);
814
815 /* BUCK2 register 1 */
816 i = 0;
817 while (buck12_voltage_map_desc.min +
818 buck12_voltage_map_desc.step*i
819 < (pdata->buck2_voltage1 / 1000))
820 i++;
821 max8998->buck2_vol[0] = i;
822 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK2_VOLTAGE1, i);
823 if (ret)
824 goto err_free_mem;
825
826 /* BUCK2 register 2 */
827 i = 0;
828 while (buck12_voltage_map_desc.min +
829 buck12_voltage_map_desc.step*i
830 < (pdata->buck2_voltage2 / 1000))
831 i++;
832 printk(KERN_ERR "i2:%d, buck2_idx:%d\n", i, max8998->buck2_idx);
833 max8998->buck2_vol[1] = i;
834 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK2_VOLTAGE2, i);
835 if (ret)
836 goto err_free_mem;
837 }
838
839 for (i = 0; i < pdata->num_regulators; i++) {
840 const struct voltage_map_desc *desc;
841 int id = pdata->regulators[i].id;
842 int index = id - MAX8998_LDO2;
843
844 desc = ldo_voltage_map[id];
845 if (desc && regulators[index].ops != &max8998_others_ops) {
846 int count = (desc->max - desc->min) / desc->step + 1;
847 regulators[index].n_voltages = count;
848 }
849 rdev[i] = regulator_register(®ulators[index], max8998->dev,
850 pdata->regulators[i].initdata, max8998);
851 if (IS_ERR(rdev[i])) {
852 ret = PTR_ERR(rdev[i]);
853 dev_err(max8998->dev, "regulator init failed\n");
854 rdev[i] = NULL;
855 goto err;
856 }
857 }
858
859
860 return 0;
861err:
862 for (i = 0; i < max8998->num_regulators; i++)
863 if (rdev[i])
864 regulator_unregister(rdev[i]);
865
866err_free_mem:
867 kfree(max8998->rdev);
868 kfree(max8998);
869
870 return ret;
871}
872
873static int __devexit max8998_pmic_remove(struct platform_device *pdev)
874{
875 struct max8998_data *max8998 = platform_get_drvdata(pdev);
876 struct regulator_dev **rdev = max8998->rdev;
877 int i;
878
879 for (i = 0; i < max8998->num_regulators; i++)
880 if (rdev[i])
881 regulator_unregister(rdev[i]);
882
883 kfree(max8998->rdev);
884 kfree(max8998);
885
886 return 0;
887}
888
889static const struct platform_device_id max8998_pmic_id[] = {
890 { "max8998-pmic", TYPE_MAX8998 },
891 { "lp3974-pmic", TYPE_LP3974 },
892 { }
893};
894MODULE_DEVICE_TABLE(platform, max8998_pmic_id);
895
896static struct platform_driver max8998_pmic_driver = {
897 .driver = {
898 .name = "max8998-pmic",
899 .owner = THIS_MODULE,
900 },
901 .probe = max8998_pmic_probe,
902 .remove = __devexit_p(max8998_pmic_remove),
903 .id_table = max8998_pmic_id,
904};
905
906static int __init max8998_pmic_init(void)
907{
908 return platform_driver_register(&max8998_pmic_driver);
909}
910subsys_initcall(max8998_pmic_init);
911
912static void __exit max8998_pmic_cleanup(void)
913{
914 platform_driver_unregister(&max8998_pmic_driver);
915}
916module_exit(max8998_pmic_cleanup);
917
918MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
919MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
920MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0+
2//
3// max8998.c - Voltage regulator driver for the Maxim 8998
4//
5// Copyright (C) 2009-2010 Samsung Electronics
6// Kyungmin Park <kyungmin.park@samsung.com>
7// Marek Szyprowski <m.szyprowski@samsung.com>
8
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/i2c.h>
12#include <linux/err.h>
13#include <linux/gpio.h>
14#include <linux/slab.h>
15#include <linux/interrupt.h>
16#include <linux/mutex.h>
17#include <linux/of.h>
18#include <linux/of_gpio.h>
19#include <linux/platform_device.h>
20#include <linux/regulator/driver.h>
21#include <linux/regulator/of_regulator.h>
22#include <linux/mfd/max8998.h>
23#include <linux/mfd/max8998-private.h>
24
25struct max8998_data {
26 struct device *dev;
27 struct max8998_dev *iodev;
28 int num_regulators;
29 u8 buck1_vol[4]; /* voltages for selection */
30 u8 buck2_vol[2];
31 unsigned int buck1_idx; /* index to last changed voltage */
32 /* value in a set */
33 unsigned int buck2_idx;
34};
35
36static int max8998_get_enable_register(struct regulator_dev *rdev,
37 int *reg, int *shift)
38{
39 int ldo = rdev_get_id(rdev);
40
41 switch (ldo) {
42 case MAX8998_LDO2 ... MAX8998_LDO5:
43 *reg = MAX8998_REG_ONOFF1;
44 *shift = 3 - (ldo - MAX8998_LDO2);
45 break;
46 case MAX8998_LDO6 ... MAX8998_LDO13:
47 *reg = MAX8998_REG_ONOFF2;
48 *shift = 7 - (ldo - MAX8998_LDO6);
49 break;
50 case MAX8998_LDO14 ... MAX8998_LDO17:
51 *reg = MAX8998_REG_ONOFF3;
52 *shift = 7 - (ldo - MAX8998_LDO14);
53 break;
54 case MAX8998_BUCK1 ... MAX8998_BUCK4:
55 *reg = MAX8998_REG_ONOFF1;
56 *shift = 7 - (ldo - MAX8998_BUCK1);
57 break;
58 case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
59 *reg = MAX8998_REG_ONOFF4;
60 *shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
61 break;
62 case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
63 *reg = MAX8998_REG_CHGR2;
64 *shift = 7 - (ldo - MAX8998_ESAFEOUT1);
65 break;
66 default:
67 return -EINVAL;
68 }
69
70 return 0;
71}
72
73static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
74{
75 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
76 struct i2c_client *i2c = max8998->iodev->i2c;
77 int ret, reg, shift = 8;
78 u8 val;
79
80 ret = max8998_get_enable_register(rdev, ®, &shift);
81 if (ret)
82 return ret;
83
84 ret = max8998_read_reg(i2c, reg, &val);
85 if (ret)
86 return ret;
87
88 return val & (1 << shift);
89}
90
91static int max8998_ldo_enable(struct regulator_dev *rdev)
92{
93 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
94 struct i2c_client *i2c = max8998->iodev->i2c;
95 int reg, shift = 8, ret;
96
97 ret = max8998_get_enable_register(rdev, ®, &shift);
98 if (ret)
99 return ret;
100
101 return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
102}
103
104static int max8998_ldo_disable(struct regulator_dev *rdev)
105{
106 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
107 struct i2c_client *i2c = max8998->iodev->i2c;
108 int reg, shift = 8, ret;
109
110 ret = max8998_get_enable_register(rdev, ®, &shift);
111 if (ret)
112 return ret;
113
114 return max8998_update_reg(i2c, reg, 0, 1<<shift);
115}
116
117static int max8998_get_voltage_register(struct regulator_dev *rdev,
118 int *_reg, int *_shift, int *_mask)
119{
120 int ldo = rdev_get_id(rdev);
121 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
122 int reg, shift = 0, mask = 0xff;
123
124 switch (ldo) {
125 case MAX8998_LDO2 ... MAX8998_LDO3:
126 reg = MAX8998_REG_LDO2_LDO3;
127 mask = 0xf;
128 if (ldo == MAX8998_LDO2)
129 shift = 4;
130 else
131 shift = 0;
132 break;
133 case MAX8998_LDO4 ... MAX8998_LDO7:
134 reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
135 break;
136 case MAX8998_LDO8 ... MAX8998_LDO9:
137 reg = MAX8998_REG_LDO8_LDO9;
138 mask = 0xf;
139 if (ldo == MAX8998_LDO8)
140 shift = 4;
141 else
142 shift = 0;
143 break;
144 case MAX8998_LDO10 ... MAX8998_LDO11:
145 reg = MAX8998_REG_LDO10_LDO11;
146 if (ldo == MAX8998_LDO10) {
147 shift = 5;
148 mask = 0x7;
149 } else {
150 shift = 0;
151 mask = 0x1f;
152 }
153 break;
154 case MAX8998_LDO12 ... MAX8998_LDO17:
155 reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
156 break;
157 case MAX8998_BUCK1:
158 reg = MAX8998_REG_BUCK1_VOLTAGE1 + max8998->buck1_idx;
159 break;
160 case MAX8998_BUCK2:
161 reg = MAX8998_REG_BUCK2_VOLTAGE1 + max8998->buck2_idx;
162 break;
163 case MAX8998_BUCK3:
164 reg = MAX8998_REG_BUCK3;
165 break;
166 case MAX8998_BUCK4:
167 reg = MAX8998_REG_BUCK4;
168 break;
169 default:
170 return -EINVAL;
171 }
172
173 *_reg = reg;
174 *_shift = shift;
175 *_mask = mask;
176
177 return 0;
178}
179
180static int max8998_get_voltage_sel(struct regulator_dev *rdev)
181{
182 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
183 struct i2c_client *i2c = max8998->iodev->i2c;
184 int reg, shift = 0, mask, ret;
185 u8 val;
186
187 ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
188 if (ret)
189 return ret;
190
191 ret = max8998_read_reg(i2c, reg, &val);
192 if (ret)
193 return ret;
194
195 val >>= shift;
196 val &= mask;
197
198 return val;
199}
200
201static int max8998_set_voltage_ldo_sel(struct regulator_dev *rdev,
202 unsigned selector)
203{
204 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
205 struct i2c_client *i2c = max8998->iodev->i2c;
206 int reg, shift = 0, mask, ret;
207
208 ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
209 if (ret)
210 return ret;
211
212 ret = max8998_update_reg(i2c, reg, selector<<shift, mask<<shift);
213
214 return ret;
215}
216
217static inline void buck1_gpio_set(int gpio1, int gpio2, int v)
218{
219 gpio_set_value(gpio1, v & 0x1);
220 gpio_set_value(gpio2, (v >> 1) & 0x1);
221}
222
223static inline void buck2_gpio_set(int gpio, int v)
224{
225 gpio_set_value(gpio, v & 0x1);
226}
227
228static int max8998_set_voltage_buck_sel(struct regulator_dev *rdev,
229 unsigned selector)
230{
231 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
232 struct max8998_platform_data *pdata = max8998->iodev->pdata;
233 struct i2c_client *i2c = max8998->iodev->i2c;
234 int buck = rdev_get_id(rdev);
235 int reg, shift = 0, mask, ret, j;
236 static u8 buck1_last_val;
237
238 ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
239 if (ret)
240 return ret;
241
242 switch (buck) {
243 case MAX8998_BUCK1:
244 dev_dbg(max8998->dev,
245 "BUCK1, selector:%d, buck1_vol1:%d, buck1_vol2:%d\n"
246 "buck1_vol3:%d, buck1_vol4:%d\n",
247 selector, max8998->buck1_vol[0], max8998->buck1_vol[1],
248 max8998->buck1_vol[2], max8998->buck1_vol[3]);
249
250 if (gpio_is_valid(pdata->buck1_set1) &&
251 gpio_is_valid(pdata->buck1_set2)) {
252
253 /* check if requested voltage */
254 /* value is already defined */
255 for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
256 if (max8998->buck1_vol[j] == selector) {
257 max8998->buck1_idx = j;
258 buck1_gpio_set(pdata->buck1_set1,
259 pdata->buck1_set2, j);
260 goto buck1_exit;
261 }
262 }
263
264 if (pdata->buck_voltage_lock)
265 return -EINVAL;
266
267 /* no predefine regulator found */
268 max8998->buck1_idx = (buck1_last_val % 2) + 2;
269 dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
270 max8998->buck1_idx);
271 max8998->buck1_vol[max8998->buck1_idx] = selector;
272 ret = max8998_get_voltage_register(rdev, ®,
273 &shift,
274 &mask);
275 ret = max8998_write_reg(i2c, reg, selector);
276 buck1_gpio_set(pdata->buck1_set1,
277 pdata->buck1_set2, max8998->buck1_idx);
278 buck1_last_val++;
279buck1_exit:
280 dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
281 i2c->name, gpio_get_value(pdata->buck1_set1),
282 gpio_get_value(pdata->buck1_set2));
283 break;
284 } else {
285 ret = max8998_write_reg(i2c, reg, selector);
286 }
287 break;
288
289 case MAX8998_BUCK2:
290 dev_dbg(max8998->dev,
291 "BUCK2, selector:%d buck2_vol1:%d, buck2_vol2:%d\n",
292 selector, max8998->buck2_vol[0], max8998->buck2_vol[1]);
293 if (gpio_is_valid(pdata->buck2_set3)) {
294
295 /* check if requested voltage */
296 /* value is already defined */
297 for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
298 if (max8998->buck2_vol[j] == selector) {
299 max8998->buck2_idx = j;
300 buck2_gpio_set(pdata->buck2_set3, j);
301 goto buck2_exit;
302 }
303 }
304
305 if (pdata->buck_voltage_lock)
306 return -EINVAL;
307
308 max8998_get_voltage_register(rdev,
309 ®, &shift, &mask);
310 ret = max8998_write_reg(i2c, reg, selector);
311 max8998->buck2_vol[max8998->buck2_idx] = selector;
312 buck2_gpio_set(pdata->buck2_set3, max8998->buck2_idx);
313buck2_exit:
314 dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
315 gpio_get_value(pdata->buck2_set3));
316 } else {
317 ret = max8998_write_reg(i2c, reg, selector);
318 }
319 break;
320
321 case MAX8998_BUCK3:
322 case MAX8998_BUCK4:
323 ret = max8998_update_reg(i2c, reg, selector<<shift,
324 mask<<shift);
325 break;
326 }
327
328 return ret;
329}
330
331static int max8998_set_voltage_buck_time_sel(struct regulator_dev *rdev,
332 unsigned int old_selector,
333 unsigned int new_selector)
334{
335 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
336 struct i2c_client *i2c = max8998->iodev->i2c;
337 int buck = rdev_get_id(rdev);
338 u8 val = 0;
339 int difference, ret;
340
341 if (buck < MAX8998_BUCK1 || buck > MAX8998_BUCK4)
342 return -EINVAL;
343
344 /* Voltage stabilization */
345 ret = max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
346 if (ret)
347 return ret;
348
349 /* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
350 /* MAX8998 has ENRAMP bit implemented, so test it*/
351 if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
352 return 0;
353
354 difference = (new_selector - old_selector) * rdev->desc->uV_step / 1000;
355 if (difference > 0)
356 return DIV_ROUND_UP(difference, (val & 0x0f) + 1);
357
358 return 0;
359}
360
361static const struct regulator_ops max8998_ldo_ops = {
362 .list_voltage = regulator_list_voltage_linear,
363 .map_voltage = regulator_map_voltage_linear,
364 .is_enabled = max8998_ldo_is_enabled,
365 .enable = max8998_ldo_enable,
366 .disable = max8998_ldo_disable,
367 .get_voltage_sel = max8998_get_voltage_sel,
368 .set_voltage_sel = max8998_set_voltage_ldo_sel,
369};
370
371static const struct regulator_ops max8998_buck_ops = {
372 .list_voltage = regulator_list_voltage_linear,
373 .map_voltage = regulator_map_voltage_linear,
374 .is_enabled = max8998_ldo_is_enabled,
375 .enable = max8998_ldo_enable,
376 .disable = max8998_ldo_disable,
377 .get_voltage_sel = max8998_get_voltage_sel,
378 .set_voltage_sel = max8998_set_voltage_buck_sel,
379 .set_voltage_time_sel = max8998_set_voltage_buck_time_sel,
380};
381
382static const struct regulator_ops max8998_others_ops = {
383 .is_enabled = max8998_ldo_is_enabled,
384 .enable = max8998_ldo_enable,
385 .disable = max8998_ldo_disable,
386};
387
388#define MAX8998_LINEAR_REG(_name, _ops, _min, _step, _max) \
389 { \
390 .name = #_name, \
391 .id = MAX8998_##_name, \
392 .ops = _ops, \
393 .min_uV = (_min), \
394 .uV_step = (_step), \
395 .n_voltages = ((_max) - (_min)) / (_step) + 1, \
396 .type = REGULATOR_VOLTAGE, \
397 .owner = THIS_MODULE, \
398 }
399
400#define MAX8998_OTHERS_REG(_name, _id) \
401 { \
402 .name = #_name, \
403 .id = _id, \
404 .ops = &max8998_others_ops, \
405 .type = REGULATOR_VOLTAGE, \
406 .owner = THIS_MODULE, \
407 }
408
409static const struct regulator_desc regulators[] = {
410 MAX8998_LINEAR_REG(LDO2, &max8998_ldo_ops, 800000, 50000, 1300000),
411 MAX8998_LINEAR_REG(LDO3, &max8998_ldo_ops, 800000, 50000, 1300000),
412 MAX8998_LINEAR_REG(LDO4, &max8998_ldo_ops, 1600000, 100000, 3600000),
413 MAX8998_LINEAR_REG(LDO5, &max8998_ldo_ops, 1600000, 100000, 3600000),
414 MAX8998_LINEAR_REG(LDO6, &max8998_ldo_ops, 1600000, 100000, 3600000),
415 MAX8998_LINEAR_REG(LDO7, &max8998_ldo_ops, 1600000, 100000, 3600000),
416 MAX8998_LINEAR_REG(LDO8, &max8998_ldo_ops, 3000000, 100000, 3600000),
417 MAX8998_LINEAR_REG(LDO9, &max8998_ldo_ops, 2800000, 100000, 3100000),
418 MAX8998_LINEAR_REG(LDO10, &max8998_ldo_ops, 950000, 50000, 1300000),
419 MAX8998_LINEAR_REG(LDO11, &max8998_ldo_ops, 1600000, 100000, 3600000),
420 MAX8998_LINEAR_REG(LDO12, &max8998_ldo_ops, 800000, 100000, 3300000),
421 MAX8998_LINEAR_REG(LDO13, &max8998_ldo_ops, 800000, 100000, 3300000),
422 MAX8998_LINEAR_REG(LDO14, &max8998_ldo_ops, 1200000, 100000, 3300000),
423 MAX8998_LINEAR_REG(LDO15, &max8998_ldo_ops, 1200000, 100000, 3300000),
424 MAX8998_LINEAR_REG(LDO16, &max8998_ldo_ops, 1600000, 100000, 3600000),
425 MAX8998_LINEAR_REG(LDO17, &max8998_ldo_ops, 1600000, 100000, 3600000),
426 MAX8998_LINEAR_REG(BUCK1, &max8998_buck_ops, 750000, 25000, 1525000),
427 MAX8998_LINEAR_REG(BUCK2, &max8998_buck_ops, 750000, 25000, 1525000),
428 MAX8998_LINEAR_REG(BUCK3, &max8998_buck_ops, 1600000, 100000, 3600000),
429 MAX8998_LINEAR_REG(BUCK4, &max8998_buck_ops, 800000, 100000, 2300000),
430 MAX8998_OTHERS_REG(EN32KHz-AP, MAX8998_EN32KHZ_AP),
431 MAX8998_OTHERS_REG(EN32KHz-CP, MAX8998_EN32KHZ_CP),
432 MAX8998_OTHERS_REG(ENVICHG, MAX8998_ENVICHG),
433 MAX8998_OTHERS_REG(ESAFEOUT1, MAX8998_ESAFEOUT1),
434 MAX8998_OTHERS_REG(ESAFEOUT2, MAX8998_ESAFEOUT2),
435};
436
437static int max8998_pmic_dt_parse_dvs_gpio(struct max8998_dev *iodev,
438 struct max8998_platform_data *pdata,
439 struct device_node *pmic_np)
440{
441 int gpio;
442
443 gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck1-dvs-gpios", 0);
444 if (!gpio_is_valid(gpio)) {
445 dev_err(iodev->dev, "invalid buck1 gpio[0]: %d\n", gpio);
446 return -EINVAL;
447 }
448 pdata->buck1_set1 = gpio;
449
450 gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck1-dvs-gpios", 1);
451 if (!gpio_is_valid(gpio)) {
452 dev_err(iodev->dev, "invalid buck1 gpio[1]: %d\n", gpio);
453 return -EINVAL;
454 }
455 pdata->buck1_set2 = gpio;
456
457 gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck2-dvs-gpio", 0);
458 if (!gpio_is_valid(gpio)) {
459 dev_err(iodev->dev, "invalid buck 2 gpio: %d\n", gpio);
460 return -EINVAL;
461 }
462 pdata->buck2_set3 = gpio;
463
464 return 0;
465}
466
467static int max8998_pmic_dt_parse_pdata(struct max8998_dev *iodev,
468 struct max8998_platform_data *pdata)
469{
470 struct device_node *pmic_np = iodev->dev->of_node;
471 struct device_node *regulators_np, *reg_np;
472 struct max8998_regulator_data *rdata;
473 unsigned int i;
474 int ret;
475
476 regulators_np = of_get_child_by_name(pmic_np, "regulators");
477 if (!regulators_np) {
478 dev_err(iodev->dev, "could not find regulators sub-node\n");
479 return -EINVAL;
480 }
481
482 /* count the number of regulators to be supported in pmic */
483 pdata->num_regulators = of_get_child_count(regulators_np);
484
485 rdata = devm_kcalloc(iodev->dev,
486 pdata->num_regulators, sizeof(*rdata),
487 GFP_KERNEL);
488 if (!rdata) {
489 of_node_put(regulators_np);
490 return -ENOMEM;
491 }
492
493 pdata->regulators = rdata;
494 for (i = 0; i < ARRAY_SIZE(regulators); ++i) {
495 reg_np = of_get_child_by_name(regulators_np,
496 regulators[i].name);
497 if (!reg_np)
498 continue;
499
500 rdata->id = regulators[i].id;
501 rdata->initdata = of_get_regulator_init_data(iodev->dev,
502 reg_np,
503 ®ulators[i]);
504 rdata->reg_node = reg_np;
505 ++rdata;
506 }
507 pdata->num_regulators = rdata - pdata->regulators;
508
509 of_node_put(reg_np);
510 of_node_put(regulators_np);
511
512 ret = max8998_pmic_dt_parse_dvs_gpio(iodev, pdata, pmic_np);
513 if (ret)
514 return -EINVAL;
515
516 if (of_find_property(pmic_np, "max8998,pmic-buck-voltage-lock", NULL))
517 pdata->buck_voltage_lock = true;
518
519 ret = of_property_read_u32(pmic_np,
520 "max8998,pmic-buck1-default-dvs-idx",
521 &pdata->buck1_default_idx);
522 if (!ret && pdata->buck1_default_idx >= 4) {
523 pdata->buck1_default_idx = 0;
524 dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
525 }
526
527 ret = of_property_read_u32(pmic_np,
528 "max8998,pmic-buck2-default-dvs-idx",
529 &pdata->buck2_default_idx);
530 if (!ret && pdata->buck2_default_idx >= 2) {
531 pdata->buck2_default_idx = 0;
532 dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
533 }
534
535 ret = of_property_read_u32_array(pmic_np,
536 "max8998,pmic-buck1-dvs-voltage",
537 pdata->buck1_voltage,
538 ARRAY_SIZE(pdata->buck1_voltage));
539 if (ret) {
540 dev_err(iodev->dev, "buck1 voltages not specified\n");
541 return -EINVAL;
542 }
543
544 ret = of_property_read_u32_array(pmic_np,
545 "max8998,pmic-buck2-dvs-voltage",
546 pdata->buck2_voltage,
547 ARRAY_SIZE(pdata->buck2_voltage));
548 if (ret) {
549 dev_err(iodev->dev, "buck2 voltages not specified\n");
550 return -EINVAL;
551 }
552
553 return 0;
554}
555
556static int max8998_pmic_probe(struct platform_device *pdev)
557{
558 struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
559 struct max8998_platform_data *pdata = iodev->pdata;
560 struct regulator_config config = { };
561 struct regulator_dev *rdev;
562 struct max8998_data *max8998;
563 struct i2c_client *i2c;
564 int i, ret;
565 unsigned int v;
566
567 if (!pdata) {
568 dev_err(pdev->dev.parent, "No platform init data supplied\n");
569 return -ENODEV;
570 }
571
572 if (IS_ENABLED(CONFIG_OF) && iodev->dev->of_node) {
573 ret = max8998_pmic_dt_parse_pdata(iodev, pdata);
574 if (ret)
575 return ret;
576 }
577
578 max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_data),
579 GFP_KERNEL);
580 if (!max8998)
581 return -ENOMEM;
582
583 max8998->dev = &pdev->dev;
584 max8998->iodev = iodev;
585 max8998->num_regulators = pdata->num_regulators;
586 platform_set_drvdata(pdev, max8998);
587 i2c = max8998->iodev->i2c;
588
589 max8998->buck1_idx = pdata->buck1_default_idx;
590 max8998->buck2_idx = pdata->buck2_default_idx;
591
592 /* NOTE: */
593 /* For unused GPIO NOT marked as -1 (thereof equal to 0) WARN_ON */
594 /* will be displayed */
595
596 /* Check if MAX8998 voltage selection GPIOs are defined */
597 if (gpio_is_valid(pdata->buck1_set1) &&
598 gpio_is_valid(pdata->buck1_set2)) {
599 /* Check if SET1 is not equal to 0 */
600 if (!pdata->buck1_set1) {
601 dev_err(&pdev->dev,
602 "MAX8998 SET1 GPIO defined as 0 !\n");
603 WARN_ON(!pdata->buck1_set1);
604 return -EIO;
605 }
606 /* Check if SET2 is not equal to 0 */
607 if (!pdata->buck1_set2) {
608 dev_err(&pdev->dev,
609 "MAX8998 SET2 GPIO defined as 0 !\n");
610 WARN_ON(!pdata->buck1_set2);
611 return -EIO;
612 }
613
614 gpio_request(pdata->buck1_set1, "MAX8998 BUCK1_SET1");
615 gpio_direction_output(pdata->buck1_set1,
616 max8998->buck1_idx & 0x1);
617
618
619 gpio_request(pdata->buck1_set2, "MAX8998 BUCK1_SET2");
620 gpio_direction_output(pdata->buck1_set2,
621 (max8998->buck1_idx >> 1) & 0x1);
622
623 /* Set predefined values for BUCK1 registers */
624 for (v = 0; v < ARRAY_SIZE(pdata->buck1_voltage); ++v) {
625 int index = MAX8998_BUCK1 - MAX8998_LDO2;
626
627 i = 0;
628 while (regulators[index].min_uV +
629 regulators[index].uV_step * i
630 < pdata->buck1_voltage[v])
631 i++;
632
633 max8998->buck1_vol[v] = i;
634 ret = max8998_write_reg(i2c,
635 MAX8998_REG_BUCK1_VOLTAGE1 + v, i);
636 if (ret)
637 return ret;
638 }
639 }
640
641 if (gpio_is_valid(pdata->buck2_set3)) {
642 /* Check if SET3 is not equal to 0 */
643 if (!pdata->buck2_set3) {
644 dev_err(&pdev->dev,
645 "MAX8998 SET3 GPIO defined as 0 !\n");
646 WARN_ON(!pdata->buck2_set3);
647 return -EIO;
648 }
649 gpio_request(pdata->buck2_set3, "MAX8998 BUCK2_SET3");
650 gpio_direction_output(pdata->buck2_set3,
651 max8998->buck2_idx & 0x1);
652
653 /* Set predefined values for BUCK2 registers */
654 for (v = 0; v < ARRAY_SIZE(pdata->buck2_voltage); ++v) {
655 int index = MAX8998_BUCK2 - MAX8998_LDO2;
656
657 i = 0;
658 while (regulators[index].min_uV +
659 regulators[index].uV_step * i
660 < pdata->buck2_voltage[v])
661 i++;
662
663 max8998->buck2_vol[v] = i;
664 ret = max8998_write_reg(i2c,
665 MAX8998_REG_BUCK2_VOLTAGE1 + v, i);
666 if (ret)
667 return ret;
668 }
669 }
670
671 for (i = 0; i < pdata->num_regulators; i++) {
672 int index = pdata->regulators[i].id - MAX8998_LDO2;
673
674 config.dev = max8998->dev;
675 config.of_node = pdata->regulators[i].reg_node;
676 config.init_data = pdata->regulators[i].initdata;
677 config.driver_data = max8998;
678
679 rdev = devm_regulator_register(&pdev->dev, ®ulators[index],
680 &config);
681 if (IS_ERR(rdev)) {
682 ret = PTR_ERR(rdev);
683 dev_err(max8998->dev, "regulator %s init failed (%d)\n",
684 regulators[index].name, ret);
685 return ret;
686 }
687 }
688
689 return 0;
690}
691
692static const struct platform_device_id max8998_pmic_id[] = {
693 { "max8998-pmic", TYPE_MAX8998 },
694 { "lp3974-pmic", TYPE_LP3974 },
695 { }
696};
697MODULE_DEVICE_TABLE(platform, max8998_pmic_id);
698
699static struct platform_driver max8998_pmic_driver = {
700 .driver = {
701 .name = "max8998-pmic",
702 },
703 .probe = max8998_pmic_probe,
704 .id_table = max8998_pmic_id,
705};
706
707static int __init max8998_pmic_init(void)
708{
709 return platform_driver_register(&max8998_pmic_driver);
710}
711subsys_initcall(max8998_pmic_init);
712
713static void __exit max8998_pmic_cleanup(void)
714{
715 platform_driver_unregister(&max8998_pmic_driver);
716}
717module_exit(max8998_pmic_cleanup);
718
719MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
720MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
721MODULE_LICENSE("GPL");