1 // SPDX-License-Identifier: GPL-2.0-or-later
2 //
3 // helpers.c -- Voltage/Current Regulator framework helper functions.
4 //
5 // Copyright 2007, 2008 Wolfson Microelectronics PLC.
6 // Copyright 2008 SlimLogic Ltd.
7
8 #include <linux/kernel.h>
9 #include <linux/err.h>
10 #include <linux/delay.h>
11 #include <linux/regmap.h>
12 #include <linux/regulator/consumer.h>
13 #include <linux/regulator/driver.h>
14 #include <linux/module.h>
15
16 #include "internal.h"
17
18 /**
19 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
20 *
21 * @rdev: regulator to operate on
22 *
23 * Regulators that use regmap for their register I/O can set the
24 * enable_reg and enable_mask fields in their descriptor and then use
25 * this as their is_enabled operation, saving some code.
26 */
regulator_is_enabled_regmap(struct regulator_dev * rdev)27 int regulator_is_enabled_regmap(struct regulator_dev *rdev)
28 {
29 unsigned int val;
30 int ret;
31
32 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
33 if (ret != 0)
34 return ret;
35
36 val &= rdev->desc->enable_mask;
37
38 if (rdev->desc->enable_is_inverted) {
39 if (rdev->desc->enable_val)
40 return val != rdev->desc->enable_val;
41 return val == 0;
42 } else {
43 if (rdev->desc->enable_val)
44 return val == rdev->desc->enable_val;
45 return val != 0;
46 }
47 }
48 EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
49
50 /**
51 * regulator_enable_regmap - standard enable() for regmap users
52 *
53 * @rdev: regulator to operate on
54 *
55 * Regulators that use regmap for their register I/O can set the
56 * enable_reg and enable_mask fields in their descriptor and then use
57 * this as their enable() operation, saving some code.
58 */
regulator_enable_regmap(struct regulator_dev * rdev)59 int regulator_enable_regmap(struct regulator_dev *rdev)
60 {
61 unsigned int val;
62
63 if (rdev->desc->enable_is_inverted) {
64 val = rdev->desc->disable_val;
65 } else {
66 val = rdev->desc->enable_val;
67 if (!val)
68 val = rdev->desc->enable_mask;
69 }
70
71 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
72 rdev->desc->enable_mask, val);
73 }
74 EXPORT_SYMBOL_GPL(regulator_enable_regmap);
75
76 /**
77 * regulator_disable_regmap - standard disable() for regmap users
78 *
79 * @rdev: regulator to operate on
80 *
81 * Regulators that use regmap for their register I/O can set the
82 * enable_reg and enable_mask fields in their descriptor and then use
83 * this as their disable() operation, saving some code.
84 */
regulator_disable_regmap(struct regulator_dev * rdev)85 int regulator_disable_regmap(struct regulator_dev *rdev)
86 {
87 unsigned int val;
88
89 if (rdev->desc->enable_is_inverted) {
90 val = rdev->desc->enable_val;
91 if (!val)
92 val = rdev->desc->enable_mask;
93 } else {
94 val = rdev->desc->disable_val;
95 }
96
97 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
98 rdev->desc->enable_mask, val);
99 }
100 EXPORT_SYMBOL_GPL(regulator_disable_regmap);
101
regulator_range_selector_to_index(struct regulator_dev * rdev,unsigned int rval)102 static int regulator_range_selector_to_index(struct regulator_dev *rdev,
103 unsigned int rval)
104 {
105 int i;
106
107 if (!rdev->desc->linear_range_selectors)
108 return -EINVAL;
109
110 rval &= rdev->desc->vsel_range_mask;
111
112 for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
113 if (rdev->desc->linear_range_selectors[i] == rval)
114 return i;
115 }
116 return -EINVAL;
117 }
118
119 /**
120 * regulator_get_voltage_sel_pickable_regmap - pickable range get_voltage_sel
121 *
122 * @rdev: regulator to operate on
123 *
124 * Regulators that use regmap for their register I/O and use pickable
125 * ranges can set the vsel_reg, vsel_mask, vsel_range_reg and vsel_range_mask
126 * fields in their descriptor and then use this as their get_voltage_vsel
127 * operation, saving some code.
128 */
regulator_get_voltage_sel_pickable_regmap(struct regulator_dev * rdev)129 int regulator_get_voltage_sel_pickable_regmap(struct regulator_dev *rdev)
130 {
131 unsigned int r_val;
132 int range;
133 unsigned int val;
134 int ret;
135 unsigned int voltages = 0;
136 const struct linear_range *r = rdev->desc->linear_ranges;
137
138 if (!r)
139 return -EINVAL;
140
141 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
142 if (ret != 0)
143 return ret;
144
145 ret = regmap_read(rdev->regmap, rdev->desc->vsel_range_reg, &r_val);
146 if (ret != 0)
147 return ret;
148
149 val &= rdev->desc->vsel_mask;
150 val >>= ffs(rdev->desc->vsel_mask) - 1;
151
152 range = regulator_range_selector_to_index(rdev, r_val);
153 if (range < 0)
154 return -EINVAL;
155
156 voltages = linear_range_values_in_range_array(r, range);
157
158 return val + voltages;
159 }
160 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_pickable_regmap);
161
162 /**
163 * regulator_set_voltage_sel_pickable_regmap - pickable range set_voltage_sel
164 *
165 * @rdev: regulator to operate on
166 * @sel: Selector to set
167 *
168 * Regulators that use regmap for their register I/O and use pickable
169 * ranges can set the vsel_reg, vsel_mask, vsel_range_reg and vsel_range_mask
170 * fields in their descriptor and then use this as their set_voltage_vsel
171 * operation, saving some code.
172 */
regulator_set_voltage_sel_pickable_regmap(struct regulator_dev * rdev,unsigned int sel)173 int regulator_set_voltage_sel_pickable_regmap(struct regulator_dev *rdev,
174 unsigned int sel)
175 {
176 unsigned int range;
177 int ret, i;
178 unsigned int voltages_in_range = 0;
179
180 for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
181 const struct linear_range *r;
182
183 r = &rdev->desc->linear_ranges[i];
184 voltages_in_range = linear_range_values_in_range(r);
185
186 if (sel < voltages_in_range)
187 break;
188 sel -= voltages_in_range;
189 }
190
191 if (i == rdev->desc->n_linear_ranges)
192 return -EINVAL;
193
194 sel <<= ffs(rdev->desc->vsel_mask) - 1;
195 sel += rdev->desc->linear_ranges[i].min_sel;
196
197 range = rdev->desc->linear_range_selectors[i];
198
199 if (rdev->desc->vsel_reg == rdev->desc->vsel_range_reg) {
200 ret = regmap_update_bits(rdev->regmap,
201 rdev->desc->vsel_reg,
202 rdev->desc->vsel_range_mask |
203 rdev->desc->vsel_mask, sel | range);
204 } else {
205 ret = regmap_update_bits(rdev->regmap,
206 rdev->desc->vsel_range_reg,
207 rdev->desc->vsel_range_mask, range);
208 if (ret)
209 return ret;
210
211 ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
212 rdev->desc->vsel_mask, sel);
213 }
214
215 if (ret)
216 return ret;
217
218 if (rdev->desc->apply_bit)
219 ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg,
220 rdev->desc->apply_bit,
221 rdev->desc->apply_bit);
222 return ret;
223 }
224 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_pickable_regmap);
225
226 /**
227 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
228 *
229 * @rdev: regulator to operate on
230 *
231 * Regulators that use regmap for their register I/O can set the
232 * vsel_reg and vsel_mask fields in their descriptor and then use this
233 * as their get_voltage_vsel operation, saving some code.
234 */
regulator_get_voltage_sel_regmap(struct regulator_dev * rdev)235 int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
236 {
237 unsigned int val;
238 int ret;
239
240 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
241 if (ret != 0)
242 return ret;
243
244 val &= rdev->desc->vsel_mask;
245 val >>= ffs(rdev->desc->vsel_mask) - 1;
246
247 return val;
248 }
249 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
250
251 /**
252 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
253 *
254 * @rdev: regulator to operate on
255 * @sel: Selector to set
256 *
257 * Regulators that use regmap for their register I/O can set the
258 * vsel_reg and vsel_mask fields in their descriptor and then use this
259 * as their set_voltage_vsel operation, saving some code.
260 */
regulator_set_voltage_sel_regmap(struct regulator_dev * rdev,unsigned sel)261 int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
262 {
263 int ret;
264
265 sel <<= ffs(rdev->desc->vsel_mask) - 1;
266
267 ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
268 rdev->desc->vsel_mask, sel);
269 if (ret)
270 return ret;
271
272 if (rdev->desc->apply_bit)
273 ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg,
274 rdev->desc->apply_bit,
275 rdev->desc->apply_bit);
276 return ret;
277 }
278 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
279
280 /**
281 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
282 *
283 * @rdev: Regulator to operate on
284 * @min_uV: Lower bound for voltage
285 * @max_uV: Upper bound for voltage
286 *
287 * Drivers implementing set_voltage_sel() and list_voltage() can use
288 * this as their map_voltage() operation. It will find a suitable
289 * voltage by calling list_voltage() until it gets something in bounds
290 * for the requested voltages.
291 */
regulator_map_voltage_iterate(struct regulator_dev * rdev,int min_uV,int max_uV)292 int regulator_map_voltage_iterate(struct regulator_dev *rdev,
293 int min_uV, int max_uV)
294 {
295 int best_val = INT_MAX;
296 int selector = 0;
297 int i, ret;
298
299 /* Find the smallest voltage that falls within the specified
300 * range.
301 */
302 for (i = 0; i < rdev->desc->n_voltages; i++) {
303 ret = rdev->desc->ops->list_voltage(rdev, i);
304 if (ret < 0)
305 continue;
306
307 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
308 best_val = ret;
309 selector = i;
310 }
311 }
312
313 if (best_val != INT_MAX)
314 return selector;
315 else
316 return -EINVAL;
317 }
318 EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
319
320 /**
321 * regulator_map_voltage_ascend - map_voltage() for ascendant voltage list
322 *
323 * @rdev: Regulator to operate on
324 * @min_uV: Lower bound for voltage
325 * @max_uV: Upper bound for voltage
326 *
327 * Drivers that have ascendant voltage list can use this as their
328 * map_voltage() operation.
329 */
regulator_map_voltage_ascend(struct regulator_dev * rdev,int min_uV,int max_uV)330 int regulator_map_voltage_ascend(struct regulator_dev *rdev,
331 int min_uV, int max_uV)
332 {
333 int i, ret;
334
335 for (i = 0; i < rdev->desc->n_voltages; i++) {
336 ret = rdev->desc->ops->list_voltage(rdev, i);
337 if (ret < 0)
338 continue;
339
340 if (ret > max_uV)
341 break;
342
343 if (ret >= min_uV && ret <= max_uV)
344 return i;
345 }
346
347 return -EINVAL;
348 }
349 EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend);
350
351 /**
352 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
353 *
354 * @rdev: Regulator to operate on
355 * @min_uV: Lower bound for voltage
356 * @max_uV: Upper bound for voltage
357 *
358 * Drivers providing min_uV and uV_step in their regulator_desc can
359 * use this as their map_voltage() operation.
360 */
regulator_map_voltage_linear(struct regulator_dev * rdev,int min_uV,int max_uV)361 int regulator_map_voltage_linear(struct regulator_dev *rdev,
362 int min_uV, int max_uV)
363 {
364 int ret, voltage;
365
366 /* Allow uV_step to be 0 for fixed voltage */
367 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
368 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
369 return 0;
370 else
371 return -EINVAL;
372 }
373
374 if (!rdev->desc->uV_step) {
375 BUG_ON(!rdev->desc->uV_step);
376 return -EINVAL;
377 }
378
379 if (min_uV < rdev->desc->min_uV)
380 min_uV = rdev->desc->min_uV;
381
382 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
383 if (ret < 0)
384 return ret;
385
386 ret += rdev->desc->linear_min_sel;
387
388 /* Map back into a voltage to verify we're still in bounds */
389 voltage = rdev->desc->ops->list_voltage(rdev, ret);
390 if (voltage < min_uV || voltage > max_uV)
391 return -EINVAL;
392
393 return ret;
394 }
395 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
396
397 /**
398 * regulator_map_voltage_linear_range - map_voltage() for multiple linear ranges
399 *
400 * @rdev: Regulator to operate on
401 * @min_uV: Lower bound for voltage
402 * @max_uV: Upper bound for voltage
403 *
404 * Drivers providing linear_ranges in their descriptor can use this as
405 * their map_voltage() callback.
406 */
regulator_map_voltage_linear_range(struct regulator_dev * rdev,int min_uV,int max_uV)407 int regulator_map_voltage_linear_range(struct regulator_dev *rdev,
408 int min_uV, int max_uV)
409 {
410 const struct linear_range *range;
411 int ret = -EINVAL;
412 unsigned int sel;
413 bool found;
414 int voltage, i;
415
416 if (!rdev->desc->n_linear_ranges) {
417 BUG_ON(!rdev->desc->n_linear_ranges);
418 return -EINVAL;
419 }
420
421 for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
422 range = &rdev->desc->linear_ranges[i];
423
424 ret = linear_range_get_selector_high(range, min_uV, &sel,
425 &found);
426 if (ret)
427 continue;
428 ret = sel;
429
430 /*
431 * Map back into a voltage to verify we're still in bounds.
432 * If we are not, then continue checking rest of the ranges.
433 */
434 voltage = rdev->desc->ops->list_voltage(rdev, sel);
435 if (voltage >= min_uV && voltage <= max_uV)
436 break;
437 }
438
439 if (i == rdev->desc->n_linear_ranges)
440 return -EINVAL;
441
442 return ret;
443 }
444 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear_range);
445
446 /**
447 * regulator_map_voltage_pickable_linear_range - map_voltage, pickable ranges
448 *
449 * @rdev: Regulator to operate on
450 * @min_uV: Lower bound for voltage
451 * @max_uV: Upper bound for voltage
452 *
453 * Drivers providing pickable linear_ranges in their descriptor can use
454 * this as their map_voltage() callback.
455 */
regulator_map_voltage_pickable_linear_range(struct regulator_dev * rdev,int min_uV,int max_uV)456 int regulator_map_voltage_pickable_linear_range(struct regulator_dev *rdev,
457 int min_uV, int max_uV)
458 {
459 const struct linear_range *range;
460 int ret = -EINVAL;
461 int voltage, i;
462 unsigned int selector = 0;
463
464 if (!rdev->desc->n_linear_ranges) {
465 BUG_ON(!rdev->desc->n_linear_ranges);
466 return -EINVAL;
467 }
468
469 for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
470 int linear_max_uV;
471 bool found;
472 unsigned int sel;
473
474 range = &rdev->desc->linear_ranges[i];
475 linear_max_uV = linear_range_get_max_value(range);
476
477 if (!(min_uV <= linear_max_uV && max_uV >= range->min)) {
478 selector += linear_range_values_in_range(range);
479 continue;
480 }
481
482 ret = linear_range_get_selector_high(range, min_uV, &sel,
483 &found);
484 if (ret) {
485 selector += linear_range_values_in_range(range);
486 continue;
487 }
488
489 ret = selector + sel - range->min_sel;
490
491 voltage = rdev->desc->ops->list_voltage(rdev, ret);
492
493 /*
494 * Map back into a voltage to verify we're still in bounds.
495 * We may have overlapping voltage ranges. Hence we don't
496 * exit but retry until we have checked all ranges.
497 */
498 if (voltage < min_uV || voltage > max_uV)
499 selector += linear_range_values_in_range(range);
500 else
501 break;
502 }
503
504 if (i == rdev->desc->n_linear_ranges)
505 return -EINVAL;
506
507 return ret;
508 }
509 EXPORT_SYMBOL_GPL(regulator_map_voltage_pickable_linear_range);
510
511 /**
512 * regulator_desc_list_voltage_linear - List voltages with simple calculation
513 *
514 * @desc: Regulator desc for regulator which volatges are to be listed
515 * @selector: Selector to convert into a voltage
516 *
517 * Regulators with a simple linear mapping between voltages and
518 * selectors can set min_uV and uV_step in the regulator descriptor
519 * and then use this function prior regulator registration to list
520 * the voltages. This is useful when voltages need to be listed during
521 * device-tree parsing.
522 */
regulator_desc_list_voltage_linear(const struct regulator_desc * desc,unsigned int selector)523 int regulator_desc_list_voltage_linear(const struct regulator_desc *desc,
524 unsigned int selector)
525 {
526 if (selector >= desc->n_voltages)
527 return -EINVAL;
528
529 if (selector < desc->linear_min_sel)
530 return 0;
531
532 selector -= desc->linear_min_sel;
533
534 return desc->min_uV + (desc->uV_step * selector);
535 }
536 EXPORT_SYMBOL_GPL(regulator_desc_list_voltage_linear);
537
538 /**
539 * regulator_list_voltage_linear - List voltages with simple calculation
540 *
541 * @rdev: Regulator device
542 * @selector: Selector to convert into a voltage
543 *
544 * Regulators with a simple linear mapping between voltages and
545 * selectors can set min_uV and uV_step in the regulator descriptor
546 * and then use this function as their list_voltage() operation,
547 */
regulator_list_voltage_linear(struct regulator_dev * rdev,unsigned int selector)548 int regulator_list_voltage_linear(struct regulator_dev *rdev,
549 unsigned int selector)
550 {
551 return regulator_desc_list_voltage_linear(rdev->desc, selector);
552 }
553 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
554
555 /**
556 * regulator_list_voltage_pickable_linear_range - pickable range list voltages
557 *
558 * @rdev: Regulator device
559 * @selector: Selector to convert into a voltage
560 *
561 * list_voltage() operation, intended to be used by drivers utilizing pickable
562 * ranges helpers.
563 */
regulator_list_voltage_pickable_linear_range(struct regulator_dev * rdev,unsigned int selector)564 int regulator_list_voltage_pickable_linear_range(struct regulator_dev *rdev,
565 unsigned int selector)
566 {
567 const struct linear_range *range;
568 int i;
569 unsigned int all_sels = 0;
570
571 if (!rdev->desc->n_linear_ranges) {
572 BUG_ON(!rdev->desc->n_linear_ranges);
573 return -EINVAL;
574 }
575
576 for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
577 unsigned int sel_indexes;
578
579 range = &rdev->desc->linear_ranges[i];
580
581 sel_indexes = linear_range_values_in_range(range) - 1;
582
583 if (all_sels + sel_indexes >= selector) {
584 selector -= all_sels;
585 /*
586 * As we see here, pickable ranges work only as
587 * long as the first selector for each pickable
588 * range is 0, and the each subsequent range for
589 * this 'pick' follow immediately at next unused
590 * selector (Eg. there is no gaps between ranges).
591 * I think this is fine but it probably should be
592 * documented. OTOH, whole pickable range stuff
593 * might benefit from some documentation
594 */
595 return range->min + (range->step * selector);
596 }
597
598 all_sels += (sel_indexes + 1);
599 }
600
601 return -EINVAL;
602 }
603 EXPORT_SYMBOL_GPL(regulator_list_voltage_pickable_linear_range);
604
605 /**
606 * regulator_desc_list_voltage_linear_range - List voltages for linear ranges
607 *
608 * @desc: Regulator desc for regulator which volatges are to be listed
609 * @selector: Selector to convert into a voltage
610 *
611 * Regulators with a series of simple linear mappings between voltages
612 * and selectors who have set linear_ranges in the regulator descriptor
613 * can use this function prior regulator registration to list voltages.
614 * This is useful when voltages need to be listed during device-tree
615 * parsing.
616 */
regulator_desc_list_voltage_linear_range(const struct regulator_desc * desc,unsigned int selector)617 int regulator_desc_list_voltage_linear_range(const struct regulator_desc *desc,
618 unsigned int selector)
619 {
620 unsigned int val;
621 int ret;
622
623 BUG_ON(!desc->n_linear_ranges);
624
625 ret = linear_range_get_value_array(desc->linear_ranges,
626 desc->n_linear_ranges, selector,
627 &val);
628 if (ret)
629 return ret;
630
631 return val;
632 }
633 EXPORT_SYMBOL_GPL(regulator_desc_list_voltage_linear_range);
634
635 /**
636 * regulator_list_voltage_linear_range - List voltages for linear ranges
637 *
638 * @rdev: Regulator device
639 * @selector: Selector to convert into a voltage
640 *
641 * Regulators with a series of simple linear mappings between voltages
642 * and selectors can set linear_ranges in the regulator descriptor and
643 * then use this function as their list_voltage() operation,
644 */
regulator_list_voltage_linear_range(struct regulator_dev * rdev,unsigned int selector)645 int regulator_list_voltage_linear_range(struct regulator_dev *rdev,
646 unsigned int selector)
647 {
648 return regulator_desc_list_voltage_linear_range(rdev->desc, selector);
649 }
650 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear_range);
651
652 /**
653 * regulator_list_voltage_table - List voltages with table based mapping
654 *
655 * @rdev: Regulator device
656 * @selector: Selector to convert into a voltage
657 *
658 * Regulators with table based mapping between voltages and
659 * selectors can set volt_table in the regulator descriptor
660 * and then use this function as their list_voltage() operation.
661 */
regulator_list_voltage_table(struct regulator_dev * rdev,unsigned int selector)662 int regulator_list_voltage_table(struct regulator_dev *rdev,
663 unsigned int selector)
664 {
665 if (!rdev->desc->volt_table) {
666 BUG_ON(!rdev->desc->volt_table);
667 return -EINVAL;
668 }
669
670 if (selector >= rdev->desc->n_voltages)
671 return -EINVAL;
672 if (selector < rdev->desc->linear_min_sel)
673 return 0;
674
675 return rdev->desc->volt_table[selector];
676 }
677 EXPORT_SYMBOL_GPL(regulator_list_voltage_table);
678
679 /**
680 * regulator_set_bypass_regmap - Default set_bypass() using regmap
681 *
682 * @rdev: device to operate on.
683 * @enable: state to set.
684 */
regulator_set_bypass_regmap(struct regulator_dev * rdev,bool enable)685 int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable)
686 {
687 unsigned int val;
688
689 if (enable) {
690 val = rdev->desc->bypass_val_on;
691 if (!val)
692 val = rdev->desc->bypass_mask;
693 } else {
694 val = rdev->desc->bypass_val_off;
695 }
696
697 return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg,
698 rdev->desc->bypass_mask, val);
699 }
700 EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap);
701
702 /**
703 * regulator_set_soft_start_regmap - Default set_soft_start() using regmap
704 *
705 * @rdev: device to operate on.
706 */
regulator_set_soft_start_regmap(struct regulator_dev * rdev)707 int regulator_set_soft_start_regmap(struct regulator_dev *rdev)
708 {
709 unsigned int val;
710
711 val = rdev->desc->soft_start_val_on;
712 if (!val)
713 val = rdev->desc->soft_start_mask;
714
715 return regmap_update_bits(rdev->regmap, rdev->desc->soft_start_reg,
716 rdev->desc->soft_start_mask, val);
717 }
718 EXPORT_SYMBOL_GPL(regulator_set_soft_start_regmap);
719
720 /**
721 * regulator_set_pull_down_regmap - Default set_pull_down() using regmap
722 *
723 * @rdev: device to operate on.
724 */
regulator_set_pull_down_regmap(struct regulator_dev * rdev)725 int regulator_set_pull_down_regmap(struct regulator_dev *rdev)
726 {
727 unsigned int val;
728
729 val = rdev->desc->pull_down_val_on;
730 if (!val)
731 val = rdev->desc->pull_down_mask;
732
733 return regmap_update_bits(rdev->regmap, rdev->desc->pull_down_reg,
734 rdev->desc->pull_down_mask, val);
735 }
736 EXPORT_SYMBOL_GPL(regulator_set_pull_down_regmap);
737
738 /**
739 * regulator_get_bypass_regmap - Default get_bypass() using regmap
740 *
741 * @rdev: device to operate on.
742 * @enable: current state.
743 */
regulator_get_bypass_regmap(struct regulator_dev * rdev,bool * enable)744 int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable)
745 {
746 unsigned int val;
747 unsigned int val_on = rdev->desc->bypass_val_on;
748 int ret;
749
750 ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val);
751 if (ret != 0)
752 return ret;
753
754 if (!val_on)
755 val_on = rdev->desc->bypass_mask;
756
757 *enable = (val & rdev->desc->bypass_mask) == val_on;
758
759 return 0;
760 }
761 EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap);
762
763 /**
764 * regulator_set_active_discharge_regmap - Default set_active_discharge()
765 * using regmap
766 *
767 * @rdev: device to operate on.
768 * @enable: state to set, 0 to disable and 1 to enable.
769 */
regulator_set_active_discharge_regmap(struct regulator_dev * rdev,bool enable)770 int regulator_set_active_discharge_regmap(struct regulator_dev *rdev,
771 bool enable)
772 {
773 unsigned int val;
774
775 if (enable)
776 val = rdev->desc->active_discharge_on;
777 else
778 val = rdev->desc->active_discharge_off;
779
780 return regmap_update_bits(rdev->regmap,
781 rdev->desc->active_discharge_reg,
782 rdev->desc->active_discharge_mask, val);
783 }
784 EXPORT_SYMBOL_GPL(regulator_set_active_discharge_regmap);
785
786 /**
787 * regulator_set_current_limit_regmap - set_current_limit for regmap users
788 *
789 * @rdev: regulator to operate on
790 * @min_uA: Lower bound for current limit
791 * @max_uA: Upper bound for current limit
792 *
793 * Regulators that use regmap for their register I/O can set curr_table,
794 * csel_reg and csel_mask fields in their descriptor and then use this
795 * as their set_current_limit operation, saving some code.
796 */
regulator_set_current_limit_regmap(struct regulator_dev * rdev,int min_uA,int max_uA)797 int regulator_set_current_limit_regmap(struct regulator_dev *rdev,
798 int min_uA, int max_uA)
799 {
800 unsigned int n_currents = rdev->desc->n_current_limits;
801 int i, sel = -1;
802
803 if (n_currents == 0)
804 return -EINVAL;
805
806 if (rdev->desc->curr_table) {
807 const unsigned int *curr_table = rdev->desc->curr_table;
808 bool ascend = curr_table[n_currents - 1] > curr_table[0];
809
810 /* search for closest to maximum */
811 if (ascend) {
812 for (i = n_currents - 1; i >= 0; i--) {
813 if (min_uA <= curr_table[i] &&
814 curr_table[i] <= max_uA) {
815 sel = i;
816 break;
817 }
818 }
819 } else {
820 for (i = 0; i < n_currents; i++) {
821 if (min_uA <= curr_table[i] &&
822 curr_table[i] <= max_uA) {
823 sel = i;
824 break;
825 }
826 }
827 }
828 }
829
830 if (sel < 0)
831 return -EINVAL;
832
833 sel <<= ffs(rdev->desc->csel_mask) - 1;
834
835 return regmap_update_bits(rdev->regmap, rdev->desc->csel_reg,
836 rdev->desc->csel_mask, sel);
837 }
838 EXPORT_SYMBOL_GPL(regulator_set_current_limit_regmap);
839
840 /**
841 * regulator_get_current_limit_regmap - get_current_limit for regmap users
842 *
843 * @rdev: regulator to operate on
844 *
845 * Regulators that use regmap for their register I/O can set the
846 * csel_reg and csel_mask fields in their descriptor and then use this
847 * as their get_current_limit operation, saving some code.
848 */
regulator_get_current_limit_regmap(struct regulator_dev * rdev)849 int regulator_get_current_limit_regmap(struct regulator_dev *rdev)
850 {
851 unsigned int val;
852 int ret;
853
854 ret = regmap_read(rdev->regmap, rdev->desc->csel_reg, &val);
855 if (ret != 0)
856 return ret;
857
858 val &= rdev->desc->csel_mask;
859 val >>= ffs(rdev->desc->csel_mask) - 1;
860
861 if (rdev->desc->curr_table) {
862 if (val >= rdev->desc->n_current_limits)
863 return -EINVAL;
864
865 return rdev->desc->curr_table[val];
866 }
867
868 return -EINVAL;
869 }
870 EXPORT_SYMBOL_GPL(regulator_get_current_limit_regmap);
871
872 /**
873 * regulator_bulk_set_supply_names - initialize the 'supply' fields in an array
874 * of regulator_bulk_data structs
875 *
876 * @consumers: array of regulator_bulk_data entries to initialize
877 * @supply_names: array of supply name strings
878 * @num_supplies: number of supply names to initialize
879 *
880 * Note: the 'consumers' array must be the size of 'num_supplies'.
881 */
regulator_bulk_set_supply_names(struct regulator_bulk_data * consumers,const char * const * supply_names,unsigned int num_supplies)882 void regulator_bulk_set_supply_names(struct regulator_bulk_data *consumers,
883 const char *const *supply_names,
884 unsigned int num_supplies)
885 {
886 unsigned int i;
887
888 for (i = 0; i < num_supplies; i++)
889 consumers[i].supply = supply_names[i];
890 }
891 EXPORT_SYMBOL_GPL(regulator_bulk_set_supply_names);
892
893 /**
894 * regulator_is_equal - test whether two regulators are the same
895 *
896 * @reg1: first regulator to operate on
897 * @reg2: second regulator to operate on
898 */
regulator_is_equal(struct regulator * reg1,struct regulator * reg2)899 bool regulator_is_equal(struct regulator *reg1, struct regulator *reg2)
900 {
901 return reg1->rdev == reg2->rdev;
902 }
903 EXPORT_SYMBOL_GPL(regulator_is_equal);
904
find_closest_bigger(unsigned int target,const unsigned int * table,unsigned int num_sel,unsigned int * sel)905 static int find_closest_bigger(unsigned int target, const unsigned int *table,
906 unsigned int num_sel, unsigned int *sel)
907 {
908 unsigned int s, tmp, max, maxsel = 0;
909 bool found = false;
910
911 max = table[0];
912
913 for (s = 0; s < num_sel; s++) {
914 if (table[s] > max) {
915 max = table[s];
916 maxsel = s;
917 }
918 if (table[s] >= target) {
919 if (!found || table[s] - target < tmp - target) {
920 tmp = table[s];
921 *sel = s;
922 found = true;
923 if (tmp == target)
924 break;
925 }
926 }
927 }
928
929 if (!found) {
930 *sel = maxsel;
931 return -EINVAL;
932 }
933
934 return 0;
935 }
936
937 /**
938 * regulator_set_ramp_delay_regmap - set_ramp_delay() helper
939 *
940 * @rdev: regulator to operate on
941 *
942 * Regulators that use regmap for their register I/O can set the ramp_reg
943 * and ramp_mask fields in their descriptor and then use this as their
944 * set_ramp_delay operation, saving some code.
945 */
regulator_set_ramp_delay_regmap(struct regulator_dev * rdev,int ramp_delay)946 int regulator_set_ramp_delay_regmap(struct regulator_dev *rdev, int ramp_delay)
947 {
948 int ret;
949 unsigned int sel;
950
951 if (WARN_ON(!rdev->desc->n_ramp_values || !rdev->desc->ramp_delay_table))
952 return -EINVAL;
953
954 ret = find_closest_bigger(ramp_delay, rdev->desc->ramp_delay_table,
955 rdev->desc->n_ramp_values, &sel);
956
957 if (ret) {
958 dev_warn(rdev_get_dev(rdev),
959 "Can't set ramp-delay %u, setting %u\n", ramp_delay,
960 rdev->desc->ramp_delay_table[sel]);
961 }
962
963 sel <<= ffs(rdev->desc->ramp_mask) - 1;
964
965 return regmap_update_bits(rdev->regmap, rdev->desc->ramp_reg,
966 rdev->desc->ramp_mask, sel);
967 }
968 EXPORT_SYMBOL_GPL(regulator_set_ramp_delay_regmap);
969