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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * drivers/regulator/ab3100.c
4 *
5 * Copyright (C) 2008-2009 ST-Ericsson AB
6 * Low-level control of the AB3100 IC Low Dropout (LDO)
7 * regulators, external regulator and buck converter
8 * Author: Mattias Wallin <mattias.wallin@stericsson.com>
9 * Author: Linus Walleij <linus.walleij@stericsson.com>
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/err.h>
16#include <linux/platform_device.h>
17#include <linux/regulator/driver.h>
18#include <linux/mfd/ab3100.h>
19#include <linux/mfd/abx500.h>
20#include <linux/of.h>
21#include <linux/regulator/of_regulator.h>
22
23/* LDO registers and some handy masking definitions for AB3100 */
24#define AB3100_LDO_A 0x40
25#define AB3100_LDO_C 0x41
26#define AB3100_LDO_D 0x42
27#define AB3100_LDO_E 0x43
28#define AB3100_LDO_E_SLEEP 0x44
29#define AB3100_LDO_F 0x45
30#define AB3100_LDO_G 0x46
31#define AB3100_LDO_H 0x47
32#define AB3100_LDO_H_SLEEP_MODE 0
33#define AB3100_LDO_H_SLEEP_EN 2
34#define AB3100_LDO_ON 4
35#define AB3100_LDO_H_VSEL_AC 5
36#define AB3100_LDO_K 0x48
37#define AB3100_LDO_EXT 0x49
38#define AB3100_BUCK 0x4A
39#define AB3100_BUCK_SLEEP 0x4B
40#define AB3100_REG_ON_MASK 0x10
41
42/**
43 * struct ab3100_regulator
44 * A struct passed around the individual regulator functions
45 * @platform_device: platform device holding this regulator
46 * @dev: handle to the device
47 * @plfdata: AB3100 platform data passed in at probe time
48 * @regreg: regulator register number in the AB3100
49 */
50struct ab3100_regulator {
51 struct device *dev;
52 struct ab3100_platform_data *plfdata;
53 u8 regreg;
54};
55
56/* The order in which registers are initialized */
57static const u8 ab3100_reg_init_order[AB3100_NUM_REGULATORS+2] = {
58 AB3100_LDO_A,
59 AB3100_LDO_C,
60 AB3100_LDO_E,
61 AB3100_LDO_E_SLEEP,
62 AB3100_LDO_F,
63 AB3100_LDO_G,
64 AB3100_LDO_H,
65 AB3100_LDO_K,
66 AB3100_LDO_EXT,
67 AB3100_BUCK,
68 AB3100_BUCK_SLEEP,
69 AB3100_LDO_D,
70};
71
72/* Preset (hardware defined) voltages for these regulators */
73#define LDO_A_VOLTAGE 2750000
74#define LDO_C_VOLTAGE 2650000
75#define LDO_D_VOLTAGE 2650000
76
77static const unsigned int ldo_e_buck_typ_voltages[] = {
78 1800000,
79 1400000,
80 1300000,
81 1200000,
82 1100000,
83 1050000,
84 900000,
85};
86
87static const unsigned int ldo_f_typ_voltages[] = {
88 1800000,
89 1400000,
90 1300000,
91 1200000,
92 1100000,
93 1050000,
94 2500000,
95 2650000,
96};
97
98static const unsigned int ldo_g_typ_voltages[] = {
99 2850000,
100 2750000,
101 1800000,
102 1500000,
103};
104
105static const unsigned int ldo_h_typ_voltages[] = {
106 2750000,
107 1800000,
108 1500000,
109 1200000,
110};
111
112static const unsigned int ldo_k_typ_voltages[] = {
113 2750000,
114 1800000,
115};
116
117
118/* The regulator devices */
119static struct ab3100_regulator
120ab3100_regulators[AB3100_NUM_REGULATORS] = {
121 {
122 .regreg = AB3100_LDO_A,
123 },
124 {
125 .regreg = AB3100_LDO_C,
126 },
127 {
128 .regreg = AB3100_LDO_D,
129 },
130 {
131 .regreg = AB3100_LDO_E,
132 },
133 {
134 .regreg = AB3100_LDO_F,
135 },
136 {
137 .regreg = AB3100_LDO_G,
138 },
139 {
140 .regreg = AB3100_LDO_H,
141 },
142 {
143 .regreg = AB3100_LDO_K,
144 },
145 {
146 .regreg = AB3100_LDO_EXT,
147 /* No voltages for the external regulator */
148 },
149 {
150 .regreg = AB3100_BUCK,
151 },
152};
153
154/*
155 * General functions for enable, disable and is_enabled used for
156 * LDO: A,C,E,F,G,H,K,EXT and BUCK
157 */
158static int ab3100_enable_regulator(struct regulator_dev *reg)
159{
160 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
161 int err;
162 u8 regval;
163
164 err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
165 ®val);
166 if (err) {
167 dev_warn(®->dev, "failed to get regid %d value\n",
168 abreg->regreg);
169 return err;
170 }
171
172 /* The regulator is already on, no reason to go further */
173 if (regval & AB3100_REG_ON_MASK)
174 return 0;
175
176 regval |= AB3100_REG_ON_MASK;
177
178 err = abx500_set_register_interruptible(abreg->dev, 0, abreg->regreg,
179 regval);
180 if (err) {
181 dev_warn(®->dev, "failed to set regid %d value\n",
182 abreg->regreg);
183 return err;
184 }
185
186 return 0;
187}
188
189static int ab3100_disable_regulator(struct regulator_dev *reg)
190{
191 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
192 int err;
193 u8 regval;
194
195 /*
196 * LDO D is a special regulator. When it is disabled, the entire
197 * system is shut down. So this is handled specially.
198 */
199 pr_info("Called ab3100_disable_regulator\n");
200 if (abreg->regreg == AB3100_LDO_D) {
201 dev_info(®->dev, "disabling LDO D - shut down system\n");
202 /* Setting LDO D to 0x00 cuts the power to the SoC */
203 return abx500_set_register_interruptible(abreg->dev, 0,
204 AB3100_LDO_D, 0x00U);
205 }
206
207 /*
208 * All other regulators are handled here
209 */
210 err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
211 ®val);
212 if (err) {
213 dev_err(®->dev, "unable to get register 0x%x\n",
214 abreg->regreg);
215 return err;
216 }
217 regval &= ~AB3100_REG_ON_MASK;
218 return abx500_set_register_interruptible(abreg->dev, 0, abreg->regreg,
219 regval);
220}
221
222static int ab3100_is_enabled_regulator(struct regulator_dev *reg)
223{
224 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
225 u8 regval;
226 int err;
227
228 err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
229 ®val);
230 if (err) {
231 dev_err(®->dev, "unable to get register 0x%x\n",
232 abreg->regreg);
233 return err;
234 }
235
236 return regval & AB3100_REG_ON_MASK;
237}
238
239static int ab3100_get_voltage_regulator(struct regulator_dev *reg)
240{
241 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
242 u8 regval;
243 int err;
244
245 /*
246 * For variable types, read out setting and index into
247 * supplied voltage list.
248 */
249 err = abx500_get_register_interruptible(abreg->dev, 0,
250 abreg->regreg, ®val);
251 if (err) {
252 dev_warn(®->dev,
253 "failed to get regulator value in register %02x\n",
254 abreg->regreg);
255 return err;
256 }
257
258 /* The 3 highest bits index voltages */
259 regval &= 0xE0;
260 regval >>= 5;
261
262 if (regval >= reg->desc->n_voltages) {
263 dev_err(®->dev,
264 "regulator register %02x contains an illegal voltage setting\n",
265 abreg->regreg);
266 return -EINVAL;
267 }
268
269 return reg->desc->volt_table[regval];
270}
271
272static int ab3100_set_voltage_regulator_sel(struct regulator_dev *reg,
273 unsigned selector)
274{
275 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
276 u8 regval;
277 int err;
278
279 err = abx500_get_register_interruptible(abreg->dev, 0,
280 abreg->regreg, ®val);
281 if (err) {
282 dev_warn(®->dev,
283 "failed to get regulator register %02x\n",
284 abreg->regreg);
285 return err;
286 }
287
288 /* The highest three bits control the variable regulators */
289 regval &= ~0xE0;
290 regval |= (selector << 5);
291
292 err = abx500_set_register_interruptible(abreg->dev, 0,
293 abreg->regreg, regval);
294 if (err)
295 dev_warn(®->dev, "failed to set regulator register %02x\n",
296 abreg->regreg);
297
298 return err;
299}
300
301static int ab3100_set_suspend_voltage_regulator(struct regulator_dev *reg,
302 int uV)
303{
304 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
305 u8 regval;
306 int err;
307 int bestindex;
308 u8 targetreg;
309
310 if (abreg->regreg == AB3100_LDO_E)
311 targetreg = AB3100_LDO_E_SLEEP;
312 else if (abreg->regreg == AB3100_BUCK)
313 targetreg = AB3100_BUCK_SLEEP;
314 else
315 return -EINVAL;
316
317 /* LDO E and BUCK have special suspend voltages you can set */
318 bestindex = regulator_map_voltage_iterate(reg, uV, uV);
319
320 err = abx500_get_register_interruptible(abreg->dev, 0,
321 targetreg, ®val);
322 if (err) {
323 dev_warn(®->dev,
324 "failed to get regulator register %02x\n",
325 targetreg);
326 return err;
327 }
328
329 /* The highest three bits control the variable regulators */
330 regval &= ~0xE0;
331 regval |= (bestindex << 5);
332
333 err = abx500_set_register_interruptible(abreg->dev, 0,
334 targetreg, regval);
335 if (err)
336 dev_warn(®->dev, "failed to set regulator register %02x\n",
337 abreg->regreg);
338
339 return err;
340}
341
342/*
343 * The external regulator can just define a fixed voltage.
344 */
345static int ab3100_get_voltage_regulator_external(struct regulator_dev *reg)
346{
347 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
348
349 if (abreg->plfdata)
350 return abreg->plfdata->external_voltage;
351 else
352 /* TODO: encode external voltage into device tree */
353 return 0;
354}
355
356static const struct regulator_ops regulator_ops_fixed = {
357 .enable = ab3100_enable_regulator,
358 .disable = ab3100_disable_regulator,
359 .is_enabled = ab3100_is_enabled_regulator,
360};
361
362static const struct regulator_ops regulator_ops_variable = {
363 .enable = ab3100_enable_regulator,
364 .disable = ab3100_disable_regulator,
365 .is_enabled = ab3100_is_enabled_regulator,
366 .get_voltage = ab3100_get_voltage_regulator,
367 .set_voltage_sel = ab3100_set_voltage_regulator_sel,
368 .list_voltage = regulator_list_voltage_table,
369};
370
371static const struct regulator_ops regulator_ops_variable_sleepable = {
372 .enable = ab3100_enable_regulator,
373 .disable = ab3100_disable_regulator,
374 .is_enabled = ab3100_is_enabled_regulator,
375 .get_voltage = ab3100_get_voltage_regulator,
376 .set_voltage_sel = ab3100_set_voltage_regulator_sel,
377 .set_suspend_voltage = ab3100_set_suspend_voltage_regulator,
378 .list_voltage = regulator_list_voltage_table,
379};
380
381/*
382 * LDO EXT is an external regulator so it is really
383 * not possible to set any voltage locally here, AB3100
384 * is an on/off switch plain an simple. The external
385 * voltage is defined in the board set-up if any.
386 */
387static const struct regulator_ops regulator_ops_external = {
388 .enable = ab3100_enable_regulator,
389 .disable = ab3100_disable_regulator,
390 .is_enabled = ab3100_is_enabled_regulator,
391 .get_voltage = ab3100_get_voltage_regulator_external,
392};
393
394static const struct regulator_desc
395ab3100_regulator_desc[AB3100_NUM_REGULATORS] = {
396 {
397 .name = "LDO_A",
398 .id = AB3100_LDO_A,
399 .ops = ®ulator_ops_fixed,
400 .n_voltages = 1,
401 .type = REGULATOR_VOLTAGE,
402 .owner = THIS_MODULE,
403 .fixed_uV = LDO_A_VOLTAGE,
404 .enable_time = 200,
405 },
406 {
407 .name = "LDO_C",
408 .id = AB3100_LDO_C,
409 .ops = ®ulator_ops_fixed,
410 .n_voltages = 1,
411 .type = REGULATOR_VOLTAGE,
412 .owner = THIS_MODULE,
413 .fixed_uV = LDO_C_VOLTAGE,
414 .enable_time = 200,
415 },
416 {
417 .name = "LDO_D",
418 .id = AB3100_LDO_D,
419 .ops = ®ulator_ops_fixed,
420 .n_voltages = 1,
421 .type = REGULATOR_VOLTAGE,
422 .owner = THIS_MODULE,
423 .fixed_uV = LDO_D_VOLTAGE,
424 .enable_time = 200,
425 },
426 {
427 .name = "LDO_E",
428 .id = AB3100_LDO_E,
429 .ops = ®ulator_ops_variable_sleepable,
430 .n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages),
431 .volt_table = ldo_e_buck_typ_voltages,
432 .type = REGULATOR_VOLTAGE,
433 .owner = THIS_MODULE,
434 .enable_time = 200,
435 },
436 {
437 .name = "LDO_F",
438 .id = AB3100_LDO_F,
439 .ops = ®ulator_ops_variable,
440 .n_voltages = ARRAY_SIZE(ldo_f_typ_voltages),
441 .volt_table = ldo_f_typ_voltages,
442 .type = REGULATOR_VOLTAGE,
443 .owner = THIS_MODULE,
444 .enable_time = 600,
445 },
446 {
447 .name = "LDO_G",
448 .id = AB3100_LDO_G,
449 .ops = ®ulator_ops_variable,
450 .n_voltages = ARRAY_SIZE(ldo_g_typ_voltages),
451 .volt_table = ldo_g_typ_voltages,
452 .type = REGULATOR_VOLTAGE,
453 .owner = THIS_MODULE,
454 .enable_time = 400,
455 },
456 {
457 .name = "LDO_H",
458 .id = AB3100_LDO_H,
459 .ops = ®ulator_ops_variable,
460 .n_voltages = ARRAY_SIZE(ldo_h_typ_voltages),
461 .volt_table = ldo_h_typ_voltages,
462 .type = REGULATOR_VOLTAGE,
463 .owner = THIS_MODULE,
464 .enable_time = 200,
465 },
466 {
467 .name = "LDO_K",
468 .id = AB3100_LDO_K,
469 .ops = ®ulator_ops_variable,
470 .n_voltages = ARRAY_SIZE(ldo_k_typ_voltages),
471 .volt_table = ldo_k_typ_voltages,
472 .type = REGULATOR_VOLTAGE,
473 .owner = THIS_MODULE,
474 .enable_time = 200,
475 },
476 {
477 .name = "LDO_EXT",
478 .id = AB3100_LDO_EXT,
479 .ops = ®ulator_ops_external,
480 .type = REGULATOR_VOLTAGE,
481 .owner = THIS_MODULE,
482 },
483 {
484 .name = "BUCK",
485 .id = AB3100_BUCK,
486 .ops = ®ulator_ops_variable_sleepable,
487 .n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages),
488 .volt_table = ldo_e_buck_typ_voltages,
489 .type = REGULATOR_VOLTAGE,
490 .owner = THIS_MODULE,
491 .enable_time = 1000,
492 },
493};
494
495static int ab3100_regulator_register(struct platform_device *pdev,
496 struct ab3100_platform_data *plfdata,
497 struct regulator_init_data *init_data,
498 struct device_node *np,
499 unsigned long id)
500{
501 const struct regulator_desc *desc;
502 struct ab3100_regulator *reg;
503 struct regulator_dev *rdev;
504 struct regulator_config config = { };
505 int err, i;
506
507 for (i = 0; i < AB3100_NUM_REGULATORS; i++) {
508 desc = &ab3100_regulator_desc[i];
509 if (desc->id == id)
510 break;
511 }
512 if (desc->id != id)
513 return -ENODEV;
514
515 /* Same index used for this array */
516 reg = &ab3100_regulators[i];
517
518 /*
519 * Initialize per-regulator struct.
520 * Inherit platform data, this comes down from the
521 * i2c boarddata, from the machine. So if you want to
522 * see what it looks like for a certain machine, go
523 * into the machine I2C setup.
524 */
525 reg->dev = &pdev->dev;
526 if (plfdata) {
527 reg->plfdata = plfdata;
528 config.init_data = &plfdata->reg_constraints[i];
529 } else if (np) {
530 config.of_node = np;
531 config.init_data = init_data;
532 }
533 config.dev = &pdev->dev;
534 config.driver_data = reg;
535
536 rdev = devm_regulator_register(&pdev->dev, desc, &config);
537 if (IS_ERR(rdev)) {
538 err = PTR_ERR(rdev);
539 dev_err(&pdev->dev,
540 "%s: failed to register regulator %s err %d\n",
541 __func__, desc->name,
542 err);
543 return err;
544 }
545
546 return 0;
547}
548
549static struct of_regulator_match ab3100_regulator_matches[] = {
550 { .name = "ab3100_ldo_a", .driver_data = (void *) AB3100_LDO_A, },
551 { .name = "ab3100_ldo_c", .driver_data = (void *) AB3100_LDO_C, },
552 { .name = "ab3100_ldo_d", .driver_data = (void *) AB3100_LDO_D, },
553 { .name = "ab3100_ldo_e", .driver_data = (void *) AB3100_LDO_E, },
554 { .name = "ab3100_ldo_f", .driver_data = (void *) AB3100_LDO_F },
555 { .name = "ab3100_ldo_g", .driver_data = (void *) AB3100_LDO_G },
556 { .name = "ab3100_ldo_h", .driver_data = (void *) AB3100_LDO_H },
557 { .name = "ab3100_ldo_k", .driver_data = (void *) AB3100_LDO_K },
558 { .name = "ab3100_ext", .driver_data = (void *) AB3100_LDO_EXT },
559 { .name = "ab3100_buck", .driver_data = (void *) AB3100_BUCK },
560};
561
562/*
563 * Initial settings of ab3100 registers.
564 * Common for below LDO regulator settings are that
565 * bit 7-5 controls voltage. Bit 4 turns regulator ON(1) or OFF(0).
566 * Bit 3-2 controls sleep enable and bit 1-0 controls sleep mode.
567 */
568/* LDO_A 0x16: 2.75V, ON, SLEEP_A, SLEEP OFF GND */
569#define LDO_A_SETTING 0x16
570/* LDO_C 0x10: 2.65V, ON, SLEEP_A or B, SLEEP full power */
571#define LDO_C_SETTING 0x10
572/* LDO_D 0x10: 2.65V, ON, sleep mode not used */
573#define LDO_D_SETTING 0x10
574/* LDO_E 0x10: 1.8V, ON, SLEEP_A or B, SLEEP full power */
575#define LDO_E_SETTING 0x10
576/* LDO_E SLEEP 0x00: 1.8V, not used, SLEEP_A or B, not used */
577#define LDO_E_SLEEP_SETTING 0x00
578/* LDO_F 0xD0: 2.5V, ON, SLEEP_A or B, SLEEP full power */
579#define LDO_F_SETTING 0xD0
580/* LDO_G 0x00: 2.85V, OFF, SLEEP_A or B, SLEEP full power */
581#define LDO_G_SETTING 0x00
582/* LDO_H 0x18: 2.75V, ON, SLEEP_B, SLEEP full power */
583#define LDO_H_SETTING 0x18
584/* LDO_K 0x00: 2.75V, OFF, SLEEP_A or B, SLEEP full power */
585#define LDO_K_SETTING 0x00
586/* LDO_EXT 0x00: Voltage not set, OFF, not used, not used */
587#define LDO_EXT_SETTING 0x00
588/* BUCK 0x7D: 1.2V, ON, SLEEP_A and B, SLEEP low power */
589#define BUCK_SETTING 0x7D
590/* BUCK SLEEP 0xAC: 1.05V, Not used, SLEEP_A and B, Not used */
591#define BUCK_SLEEP_SETTING 0xAC
592
593static const u8 ab3100_reg_initvals[] = {
594 LDO_A_SETTING,
595 LDO_C_SETTING,
596 LDO_E_SETTING,
597 LDO_E_SLEEP_SETTING,
598 LDO_F_SETTING,
599 LDO_G_SETTING,
600 LDO_H_SETTING,
601 LDO_K_SETTING,
602 LDO_EXT_SETTING,
603 BUCK_SETTING,
604 BUCK_SLEEP_SETTING,
605 LDO_D_SETTING,
606};
607
608static int
609ab3100_regulator_of_probe(struct platform_device *pdev, struct device_node *np)
610{
611 int err, i;
612
613 /*
614 * Set up the regulator registers, as was previously done with
615 * platform data.
616 */
617 /* Set up regulators */
618 for (i = 0; i < ARRAY_SIZE(ab3100_reg_init_order); i++) {
619 err = abx500_set_register_interruptible(&pdev->dev, 0,
620 ab3100_reg_init_order[i],
621 ab3100_reg_initvals[i]);
622 if (err) {
623 dev_err(&pdev->dev, "regulator initialization failed with error %d\n",
624 err);
625 return err;
626 }
627 }
628
629 for (i = 0; i < ARRAY_SIZE(ab3100_regulator_matches); i++) {
630 err = ab3100_regulator_register(
631 pdev, NULL, ab3100_regulator_matches[i].init_data,
632 ab3100_regulator_matches[i].of_node,
633 (unsigned long)ab3100_regulator_matches[i].driver_data);
634 if (err)
635 return err;
636 }
637
638 return 0;
639}
640
641
642static int ab3100_regulators_probe(struct platform_device *pdev)
643{
644 struct ab3100_platform_data *plfdata = dev_get_platdata(&pdev->dev);
645 struct device_node *np = pdev->dev.of_node;
646 int err = 0;
647 u8 data;
648 int i;
649
650 /* Check chip state */
651 err = abx500_get_register_interruptible(&pdev->dev, 0,
652 AB3100_LDO_D, &data);
653 if (err) {
654 dev_err(&pdev->dev, "could not read initial status of LDO_D\n");
655 return err;
656 }
657 if (data & 0x10)
658 dev_notice(&pdev->dev,
659 "chip is already in active mode (Warm start)\n");
660 else
661 dev_notice(&pdev->dev,
662 "chip is in inactive mode (Cold start)\n");
663
664 if (np) {
665 err = of_regulator_match(&pdev->dev, np,
666 ab3100_regulator_matches,
667 ARRAY_SIZE(ab3100_regulator_matches));
668 if (err < 0) {
669 dev_err(&pdev->dev,
670 "Error parsing regulator init data: %d\n", err);
671 return err;
672 }
673 return ab3100_regulator_of_probe(pdev, np);
674 }
675
676 /* Set up regulators */
677 for (i = 0; i < ARRAY_SIZE(ab3100_reg_init_order); i++) {
678 err = abx500_set_register_interruptible(&pdev->dev, 0,
679 ab3100_reg_init_order[i],
680 plfdata->reg_initvals[i]);
681 if (err) {
682 dev_err(&pdev->dev, "regulator initialization failed with error %d\n",
683 err);
684 return err;
685 }
686 }
687
688 /* Register the regulators */
689 for (i = 0; i < AB3100_NUM_REGULATORS; i++) {
690 const struct regulator_desc *desc = &ab3100_regulator_desc[i];
691
692 err = ab3100_regulator_register(pdev, plfdata, NULL, NULL,
693 desc->id);
694 if (err)
695 return err;
696 }
697
698 return 0;
699}
700
701static struct platform_driver ab3100_regulators_driver = {
702 .driver = {
703 .name = "ab3100-regulators",
704 },
705 .probe = ab3100_regulators_probe,
706};
707
708static __init int ab3100_regulators_init(void)
709{
710 return platform_driver_register(&ab3100_regulators_driver);
711}
712
713static __exit void ab3100_regulators_exit(void)
714{
715 platform_driver_unregister(&ab3100_regulators_driver);
716}
717
718subsys_initcall(ab3100_regulators_init);
719module_exit(ab3100_regulators_exit);
720
721MODULE_AUTHOR("Mattias Wallin <mattias.wallin@stericsson.com>");
722MODULE_DESCRIPTION("AB3100 Regulator driver");
723MODULE_LICENSE("GPL");
724MODULE_ALIAS("platform:ab3100-regulators");
1/*
2 * drivers/regulator/ab3100.c
3 *
4 * Copyright (C) 2008-2009 ST-Ericsson AB
5 * License terms: GNU General Public License (GPL) version 2
6 * Low-level control of the AB3100 IC Low Dropout (LDO)
7 * regulators, external regulator and buck converter
8 * Author: Mattias Wallin <mattias.wallin@stericsson.com>
9 * Author: Linus Walleij <linus.walleij@stericsson.com>
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/err.h>
16#include <linux/platform_device.h>
17#include <linux/regulator/driver.h>
18#include <linux/mfd/ab3100.h>
19#include <linux/mfd/abx500.h>
20#include <linux/of.h>
21#include <linux/regulator/of_regulator.h>
22
23/* LDO registers and some handy masking definitions for AB3100 */
24#define AB3100_LDO_A 0x40
25#define AB3100_LDO_C 0x41
26#define AB3100_LDO_D 0x42
27#define AB3100_LDO_E 0x43
28#define AB3100_LDO_E_SLEEP 0x44
29#define AB3100_LDO_F 0x45
30#define AB3100_LDO_G 0x46
31#define AB3100_LDO_H 0x47
32#define AB3100_LDO_H_SLEEP_MODE 0
33#define AB3100_LDO_H_SLEEP_EN 2
34#define AB3100_LDO_ON 4
35#define AB3100_LDO_H_VSEL_AC 5
36#define AB3100_LDO_K 0x48
37#define AB3100_LDO_EXT 0x49
38#define AB3100_BUCK 0x4A
39#define AB3100_BUCK_SLEEP 0x4B
40#define AB3100_REG_ON_MASK 0x10
41
42/**
43 * struct ab3100_regulator
44 * A struct passed around the individual regulator functions
45 * @platform_device: platform device holding this regulator
46 * @dev: handle to the device
47 * @plfdata: AB3100 platform data passed in at probe time
48 * @regreg: regulator register number in the AB3100
49 */
50struct ab3100_regulator {
51 struct regulator_dev *rdev;
52 struct device *dev;
53 struct ab3100_platform_data *plfdata;
54 u8 regreg;
55};
56
57/* The order in which registers are initialized */
58static const u8 ab3100_reg_init_order[AB3100_NUM_REGULATORS+2] = {
59 AB3100_LDO_A,
60 AB3100_LDO_C,
61 AB3100_LDO_E,
62 AB3100_LDO_E_SLEEP,
63 AB3100_LDO_F,
64 AB3100_LDO_G,
65 AB3100_LDO_H,
66 AB3100_LDO_K,
67 AB3100_LDO_EXT,
68 AB3100_BUCK,
69 AB3100_BUCK_SLEEP,
70 AB3100_LDO_D,
71};
72
73/* Preset (hardware defined) voltages for these regulators */
74#define LDO_A_VOLTAGE 2750000
75#define LDO_C_VOLTAGE 2650000
76#define LDO_D_VOLTAGE 2650000
77
78static const unsigned int ldo_e_buck_typ_voltages[] = {
79 1800000,
80 1400000,
81 1300000,
82 1200000,
83 1100000,
84 1050000,
85 900000,
86};
87
88static const unsigned int ldo_f_typ_voltages[] = {
89 1800000,
90 1400000,
91 1300000,
92 1200000,
93 1100000,
94 1050000,
95 2500000,
96 2650000,
97};
98
99static const unsigned int ldo_g_typ_voltages[] = {
100 2850000,
101 2750000,
102 1800000,
103 1500000,
104};
105
106static const unsigned int ldo_h_typ_voltages[] = {
107 2750000,
108 1800000,
109 1500000,
110 1200000,
111};
112
113static const unsigned int ldo_k_typ_voltages[] = {
114 2750000,
115 1800000,
116};
117
118
119/* The regulator devices */
120static struct ab3100_regulator
121ab3100_regulators[AB3100_NUM_REGULATORS] = {
122 {
123 .regreg = AB3100_LDO_A,
124 },
125 {
126 .regreg = AB3100_LDO_C,
127 },
128 {
129 .regreg = AB3100_LDO_D,
130 },
131 {
132 .regreg = AB3100_LDO_E,
133 },
134 {
135 .regreg = AB3100_LDO_F,
136 },
137 {
138 .regreg = AB3100_LDO_G,
139 },
140 {
141 .regreg = AB3100_LDO_H,
142 },
143 {
144 .regreg = AB3100_LDO_K,
145 },
146 {
147 .regreg = AB3100_LDO_EXT,
148 /* No voltages for the external regulator */
149 },
150 {
151 .regreg = AB3100_BUCK,
152 },
153};
154
155/*
156 * General functions for enable, disable and is_enabled used for
157 * LDO: A,C,E,F,G,H,K,EXT and BUCK
158 */
159static int ab3100_enable_regulator(struct regulator_dev *reg)
160{
161 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
162 int err;
163 u8 regval;
164
165 err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
166 ®val);
167 if (err) {
168 dev_warn(®->dev, "failed to get regid %d value\n",
169 abreg->regreg);
170 return err;
171 }
172
173 /* The regulator is already on, no reason to go further */
174 if (regval & AB3100_REG_ON_MASK)
175 return 0;
176
177 regval |= AB3100_REG_ON_MASK;
178
179 err = abx500_set_register_interruptible(abreg->dev, 0, abreg->regreg,
180 regval);
181 if (err) {
182 dev_warn(®->dev, "failed to set regid %d value\n",
183 abreg->regreg);
184 return err;
185 }
186
187 return 0;
188}
189
190static int ab3100_disable_regulator(struct regulator_dev *reg)
191{
192 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
193 int err;
194 u8 regval;
195
196 /*
197 * LDO D is a special regulator. When it is disabled, the entire
198 * system is shut down. So this is handled specially.
199 */
200 pr_info("Called ab3100_disable_regulator\n");
201 if (abreg->regreg == AB3100_LDO_D) {
202 dev_info(®->dev, "disabling LDO D - shut down system\n");
203 /* Setting LDO D to 0x00 cuts the power to the SoC */
204 return abx500_set_register_interruptible(abreg->dev, 0,
205 AB3100_LDO_D, 0x00U);
206 }
207
208 /*
209 * All other regulators are handled here
210 */
211 err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
212 ®val);
213 if (err) {
214 dev_err(®->dev, "unable to get register 0x%x\n",
215 abreg->regreg);
216 return err;
217 }
218 regval &= ~AB3100_REG_ON_MASK;
219 return abx500_set_register_interruptible(abreg->dev, 0, abreg->regreg,
220 regval);
221}
222
223static int ab3100_is_enabled_regulator(struct regulator_dev *reg)
224{
225 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
226 u8 regval;
227 int err;
228
229 err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
230 ®val);
231 if (err) {
232 dev_err(®->dev, "unable to get register 0x%x\n",
233 abreg->regreg);
234 return err;
235 }
236
237 return regval & AB3100_REG_ON_MASK;
238}
239
240static int ab3100_get_voltage_regulator(struct regulator_dev *reg)
241{
242 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
243 u8 regval;
244 int err;
245
246 /*
247 * For variable types, read out setting and index into
248 * supplied voltage list.
249 */
250 err = abx500_get_register_interruptible(abreg->dev, 0,
251 abreg->regreg, ®val);
252 if (err) {
253 dev_warn(®->dev,
254 "failed to get regulator value in register %02x\n",
255 abreg->regreg);
256 return err;
257 }
258
259 /* The 3 highest bits index voltages */
260 regval &= 0xE0;
261 regval >>= 5;
262
263 if (regval >= reg->desc->n_voltages) {
264 dev_err(®->dev,
265 "regulator register %02x contains an illegal voltage setting\n",
266 abreg->regreg);
267 return -EINVAL;
268 }
269
270 return reg->desc->volt_table[regval];
271}
272
273static int ab3100_set_voltage_regulator_sel(struct regulator_dev *reg,
274 unsigned selector)
275{
276 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
277 u8 regval;
278 int err;
279
280 err = abx500_get_register_interruptible(abreg->dev, 0,
281 abreg->regreg, ®val);
282 if (err) {
283 dev_warn(®->dev,
284 "failed to get regulator register %02x\n",
285 abreg->regreg);
286 return err;
287 }
288
289 /* The highest three bits control the variable regulators */
290 regval &= ~0xE0;
291 regval |= (selector << 5);
292
293 err = abx500_set_register_interruptible(abreg->dev, 0,
294 abreg->regreg, regval);
295 if (err)
296 dev_warn(®->dev, "failed to set regulator register %02x\n",
297 abreg->regreg);
298
299 return err;
300}
301
302static int ab3100_set_suspend_voltage_regulator(struct regulator_dev *reg,
303 int uV)
304{
305 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
306 u8 regval;
307 int err;
308 int bestindex;
309 u8 targetreg;
310
311 if (abreg->regreg == AB3100_LDO_E)
312 targetreg = AB3100_LDO_E_SLEEP;
313 else if (abreg->regreg == AB3100_BUCK)
314 targetreg = AB3100_BUCK_SLEEP;
315 else
316 return -EINVAL;
317
318 /* LDO E and BUCK have special suspend voltages you can set */
319 bestindex = regulator_map_voltage_iterate(reg, uV, uV);
320
321 err = abx500_get_register_interruptible(abreg->dev, 0,
322 targetreg, ®val);
323 if (err) {
324 dev_warn(®->dev,
325 "failed to get regulator register %02x\n",
326 targetreg);
327 return err;
328 }
329
330 /* The highest three bits control the variable regulators */
331 regval &= ~0xE0;
332 regval |= (bestindex << 5);
333
334 err = abx500_set_register_interruptible(abreg->dev, 0,
335 targetreg, regval);
336 if (err)
337 dev_warn(®->dev, "failed to set regulator register %02x\n",
338 abreg->regreg);
339
340 return err;
341}
342
343/*
344 * The external regulator can just define a fixed voltage.
345 */
346static int ab3100_get_voltage_regulator_external(struct regulator_dev *reg)
347{
348 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
349
350 if (abreg->plfdata)
351 return abreg->plfdata->external_voltage;
352 else
353 /* TODO: encode external voltage into device tree */
354 return 0;
355}
356
357static struct regulator_ops regulator_ops_fixed = {
358 .list_voltage = regulator_list_voltage_linear,
359 .enable = ab3100_enable_regulator,
360 .disable = ab3100_disable_regulator,
361 .is_enabled = ab3100_is_enabled_regulator,
362};
363
364static struct regulator_ops regulator_ops_variable = {
365 .enable = ab3100_enable_regulator,
366 .disable = ab3100_disable_regulator,
367 .is_enabled = ab3100_is_enabled_regulator,
368 .get_voltage = ab3100_get_voltage_regulator,
369 .set_voltage_sel = ab3100_set_voltage_regulator_sel,
370 .list_voltage = regulator_list_voltage_table,
371};
372
373static struct regulator_ops regulator_ops_variable_sleepable = {
374 .enable = ab3100_enable_regulator,
375 .disable = ab3100_disable_regulator,
376 .is_enabled = ab3100_is_enabled_regulator,
377 .get_voltage = ab3100_get_voltage_regulator,
378 .set_voltage_sel = ab3100_set_voltage_regulator_sel,
379 .set_suspend_voltage = ab3100_set_suspend_voltage_regulator,
380 .list_voltage = regulator_list_voltage_table,
381};
382
383/*
384 * LDO EXT is an external regulator so it is really
385 * not possible to set any voltage locally here, AB3100
386 * is an on/off switch plain an simple. The external
387 * voltage is defined in the board set-up if any.
388 */
389static struct regulator_ops regulator_ops_external = {
390 .enable = ab3100_enable_regulator,
391 .disable = ab3100_disable_regulator,
392 .is_enabled = ab3100_is_enabled_regulator,
393 .get_voltage = ab3100_get_voltage_regulator_external,
394};
395
396static struct regulator_desc
397ab3100_regulator_desc[AB3100_NUM_REGULATORS] = {
398 {
399 .name = "LDO_A",
400 .id = AB3100_LDO_A,
401 .ops = ®ulator_ops_fixed,
402 .n_voltages = 1,
403 .type = REGULATOR_VOLTAGE,
404 .owner = THIS_MODULE,
405 .min_uV = LDO_A_VOLTAGE,
406 .enable_time = 200,
407 },
408 {
409 .name = "LDO_C",
410 .id = AB3100_LDO_C,
411 .ops = ®ulator_ops_fixed,
412 .n_voltages = 1,
413 .type = REGULATOR_VOLTAGE,
414 .owner = THIS_MODULE,
415 .min_uV = LDO_C_VOLTAGE,
416 .enable_time = 200,
417 },
418 {
419 .name = "LDO_D",
420 .id = AB3100_LDO_D,
421 .ops = ®ulator_ops_fixed,
422 .n_voltages = 1,
423 .type = REGULATOR_VOLTAGE,
424 .owner = THIS_MODULE,
425 .min_uV = LDO_D_VOLTAGE,
426 .enable_time = 200,
427 },
428 {
429 .name = "LDO_E",
430 .id = AB3100_LDO_E,
431 .ops = ®ulator_ops_variable_sleepable,
432 .n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages),
433 .volt_table = ldo_e_buck_typ_voltages,
434 .type = REGULATOR_VOLTAGE,
435 .owner = THIS_MODULE,
436 .enable_time = 200,
437 },
438 {
439 .name = "LDO_F",
440 .id = AB3100_LDO_F,
441 .ops = ®ulator_ops_variable,
442 .n_voltages = ARRAY_SIZE(ldo_f_typ_voltages),
443 .volt_table = ldo_f_typ_voltages,
444 .type = REGULATOR_VOLTAGE,
445 .owner = THIS_MODULE,
446 .enable_time = 600,
447 },
448 {
449 .name = "LDO_G",
450 .id = AB3100_LDO_G,
451 .ops = ®ulator_ops_variable,
452 .n_voltages = ARRAY_SIZE(ldo_g_typ_voltages),
453 .volt_table = ldo_g_typ_voltages,
454 .type = REGULATOR_VOLTAGE,
455 .owner = THIS_MODULE,
456 .enable_time = 400,
457 },
458 {
459 .name = "LDO_H",
460 .id = AB3100_LDO_H,
461 .ops = ®ulator_ops_variable,
462 .n_voltages = ARRAY_SIZE(ldo_h_typ_voltages),
463 .volt_table = ldo_h_typ_voltages,
464 .type = REGULATOR_VOLTAGE,
465 .owner = THIS_MODULE,
466 .enable_time = 200,
467 },
468 {
469 .name = "LDO_K",
470 .id = AB3100_LDO_K,
471 .ops = ®ulator_ops_variable,
472 .n_voltages = ARRAY_SIZE(ldo_k_typ_voltages),
473 .volt_table = ldo_k_typ_voltages,
474 .type = REGULATOR_VOLTAGE,
475 .owner = THIS_MODULE,
476 .enable_time = 200,
477 },
478 {
479 .name = "LDO_EXT",
480 .id = AB3100_LDO_EXT,
481 .ops = ®ulator_ops_external,
482 .type = REGULATOR_VOLTAGE,
483 .owner = THIS_MODULE,
484 },
485 {
486 .name = "BUCK",
487 .id = AB3100_BUCK,
488 .ops = ®ulator_ops_variable_sleepable,
489 .n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages),
490 .volt_table = ldo_e_buck_typ_voltages,
491 .type = REGULATOR_VOLTAGE,
492 .owner = THIS_MODULE,
493 .enable_time = 1000,
494 },
495};
496
497static int ab3100_regulator_register(struct platform_device *pdev,
498 struct ab3100_platform_data *plfdata,
499 struct regulator_init_data *init_data,
500 struct device_node *np,
501 unsigned long id)
502{
503 struct regulator_desc *desc;
504 struct ab3100_regulator *reg;
505 struct regulator_dev *rdev;
506 struct regulator_config config = { };
507 int err, i;
508
509 for (i = 0; i < AB3100_NUM_REGULATORS; i++) {
510 desc = &ab3100_regulator_desc[i];
511 if (desc->id == id)
512 break;
513 }
514 if (desc->id != id)
515 return -ENODEV;
516
517 /* Same index used for this array */
518 reg = &ab3100_regulators[i];
519
520 /*
521 * Initialize per-regulator struct.
522 * Inherit platform data, this comes down from the
523 * i2c boarddata, from the machine. So if you want to
524 * see what it looks like for a certain machine, go
525 * into the machine I2C setup.
526 */
527 reg->dev = &pdev->dev;
528 if (plfdata) {
529 reg->plfdata = plfdata;
530 config.init_data = &plfdata->reg_constraints[i];
531 } else if (np) {
532 config.of_node = np;
533 config.init_data = init_data;
534 }
535 config.dev = &pdev->dev;
536 config.driver_data = reg;
537
538 rdev = devm_regulator_register(&pdev->dev, desc, &config);
539 if (IS_ERR(rdev)) {
540 err = PTR_ERR(rdev);
541 dev_err(&pdev->dev,
542 "%s: failed to register regulator %s err %d\n",
543 __func__, desc->name,
544 err);
545 return err;
546 }
547
548 /* Then set a pointer back to the registered regulator */
549 reg->rdev = rdev;
550 return 0;
551}
552
553static struct of_regulator_match ab3100_regulator_matches[] = {
554 { .name = "ab3100_ldo_a", .driver_data = (void *) AB3100_LDO_A, },
555 { .name = "ab3100_ldo_c", .driver_data = (void *) AB3100_LDO_C, },
556 { .name = "ab3100_ldo_d", .driver_data = (void *) AB3100_LDO_D, },
557 { .name = "ab3100_ldo_e", .driver_data = (void *) AB3100_LDO_E, },
558 { .name = "ab3100_ldo_f", .driver_data = (void *) AB3100_LDO_F },
559 { .name = "ab3100_ldo_g", .driver_data = (void *) AB3100_LDO_G },
560 { .name = "ab3100_ldo_h", .driver_data = (void *) AB3100_LDO_H },
561 { .name = "ab3100_ldo_k", .driver_data = (void *) AB3100_LDO_K },
562 { .name = "ab3100_ext", .driver_data = (void *) AB3100_LDO_EXT },
563 { .name = "ab3100_buck", .driver_data = (void *) AB3100_BUCK },
564};
565
566/*
567 * Initial settings of ab3100 registers.
568 * Common for below LDO regulator settings are that
569 * bit 7-5 controls voltage. Bit 4 turns regulator ON(1) or OFF(0).
570 * Bit 3-2 controls sleep enable and bit 1-0 controls sleep mode.
571 */
572/* LDO_A 0x16: 2.75V, ON, SLEEP_A, SLEEP OFF GND */
573#define LDO_A_SETTING 0x16
574/* LDO_C 0x10: 2.65V, ON, SLEEP_A or B, SLEEP full power */
575#define LDO_C_SETTING 0x10
576/* LDO_D 0x10: 2.65V, ON, sleep mode not used */
577#define LDO_D_SETTING 0x10
578/* LDO_E 0x10: 1.8V, ON, SLEEP_A or B, SLEEP full power */
579#define LDO_E_SETTING 0x10
580/* LDO_E SLEEP 0x00: 1.8V, not used, SLEEP_A or B, not used */
581#define LDO_E_SLEEP_SETTING 0x00
582/* LDO_F 0xD0: 2.5V, ON, SLEEP_A or B, SLEEP full power */
583#define LDO_F_SETTING 0xD0
584/* LDO_G 0x00: 2.85V, OFF, SLEEP_A or B, SLEEP full power */
585#define LDO_G_SETTING 0x00
586/* LDO_H 0x18: 2.75V, ON, SLEEP_B, SLEEP full power */
587#define LDO_H_SETTING 0x18
588/* LDO_K 0x00: 2.75V, OFF, SLEEP_A or B, SLEEP full power */
589#define LDO_K_SETTING 0x00
590/* LDO_EXT 0x00: Voltage not set, OFF, not used, not used */
591#define LDO_EXT_SETTING 0x00
592/* BUCK 0x7D: 1.2V, ON, SLEEP_A and B, SLEEP low power */
593#define BUCK_SETTING 0x7D
594/* BUCK SLEEP 0xAC: 1.05V, Not used, SLEEP_A and B, Not used */
595#define BUCK_SLEEP_SETTING 0xAC
596
597static const u8 ab3100_reg_initvals[] = {
598 LDO_A_SETTING,
599 LDO_C_SETTING,
600 LDO_E_SETTING,
601 LDO_E_SLEEP_SETTING,
602 LDO_F_SETTING,
603 LDO_G_SETTING,
604 LDO_H_SETTING,
605 LDO_K_SETTING,
606 LDO_EXT_SETTING,
607 BUCK_SETTING,
608 BUCK_SLEEP_SETTING,
609 LDO_D_SETTING,
610};
611
612static int ab3100_regulators_remove(struct platform_device *pdev)
613{
614 int i;
615
616 for (i = 0; i < AB3100_NUM_REGULATORS; i++) {
617 struct ab3100_regulator *reg = &ab3100_regulators[i];
618
619 reg->rdev = NULL;
620 }
621 return 0;
622}
623
624static int
625ab3100_regulator_of_probe(struct platform_device *pdev, struct device_node *np)
626{
627 int err, i;
628
629 /*
630 * Set up the regulator registers, as was previously done with
631 * platform data.
632 */
633 /* Set up regulators */
634 for (i = 0; i < ARRAY_SIZE(ab3100_reg_init_order); i++) {
635 err = abx500_set_register_interruptible(&pdev->dev, 0,
636 ab3100_reg_init_order[i],
637 ab3100_reg_initvals[i]);
638 if (err) {
639 dev_err(&pdev->dev, "regulator initialization failed with error %d\n",
640 err);
641 return err;
642 }
643 }
644
645 for (i = 0; i < ARRAY_SIZE(ab3100_regulator_matches); i++) {
646 err = ab3100_regulator_register(
647 pdev, NULL, ab3100_regulator_matches[i].init_data,
648 ab3100_regulator_matches[i].of_node,
649 (unsigned long)ab3100_regulator_matches[i].driver_data);
650 if (err) {
651 ab3100_regulators_remove(pdev);
652 return err;
653 }
654 }
655
656 return 0;
657}
658
659
660static int ab3100_regulators_probe(struct platform_device *pdev)
661{
662 struct ab3100_platform_data *plfdata = dev_get_platdata(&pdev->dev);
663 struct device_node *np = pdev->dev.of_node;
664 int err = 0;
665 u8 data;
666 int i;
667
668 /* Check chip state */
669 err = abx500_get_register_interruptible(&pdev->dev, 0,
670 AB3100_LDO_D, &data);
671 if (err) {
672 dev_err(&pdev->dev, "could not read initial status of LDO_D\n");
673 return err;
674 }
675 if (data & 0x10)
676 dev_notice(&pdev->dev,
677 "chip is already in active mode (Warm start)\n");
678 else
679 dev_notice(&pdev->dev,
680 "chip is in inactive mode (Cold start)\n");
681
682 if (np) {
683 err = of_regulator_match(&pdev->dev, np,
684 ab3100_regulator_matches,
685 ARRAY_SIZE(ab3100_regulator_matches));
686 if (err < 0) {
687 dev_err(&pdev->dev,
688 "Error parsing regulator init data: %d\n", err);
689 return err;
690 }
691 return ab3100_regulator_of_probe(pdev, np);
692 }
693
694 /* Set up regulators */
695 for (i = 0; i < ARRAY_SIZE(ab3100_reg_init_order); i++) {
696 err = abx500_set_register_interruptible(&pdev->dev, 0,
697 ab3100_reg_init_order[i],
698 plfdata->reg_initvals[i]);
699 if (err) {
700 dev_err(&pdev->dev, "regulator initialization failed with error %d\n",
701 err);
702 return err;
703 }
704 }
705
706 /* Register the regulators */
707 for (i = 0; i < AB3100_NUM_REGULATORS; i++) {
708 struct regulator_desc *desc = &ab3100_regulator_desc[i];
709
710 err = ab3100_regulator_register(pdev, plfdata, NULL, NULL,
711 desc->id);
712 if (err) {
713 ab3100_regulators_remove(pdev);
714 return err;
715 }
716 }
717
718 return 0;
719}
720
721static struct platform_driver ab3100_regulators_driver = {
722 .driver = {
723 .name = "ab3100-regulators",
724 .owner = THIS_MODULE,
725 },
726 .probe = ab3100_regulators_probe,
727 .remove = ab3100_regulators_remove,
728};
729
730static __init int ab3100_regulators_init(void)
731{
732 return platform_driver_register(&ab3100_regulators_driver);
733}
734
735static __exit void ab3100_regulators_exit(void)
736{
737 platform_driver_unregister(&ab3100_regulators_driver);
738}
739
740subsys_initcall(ab3100_regulators_init);
741module_exit(ab3100_regulators_exit);
742
743MODULE_AUTHOR("Mattias Wallin <mattias.wallin@stericsson.com>");
744MODULE_DESCRIPTION("AB3100 Regulator driver");
745MODULE_LICENSE("GPL");
746MODULE_ALIAS("platform:ab3100-regulators");