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/bits.h>
14#include <linux/gpio/consumer.h>
15#include <linux/slab.h>
16#include <linux/interrupt.h>
17#include <linux/mutex.h>
18#include <linux/of.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 struct gpio_desc *buck1_gpio1;
35 struct gpio_desc *buck1_gpio2;
36 struct gpio_desc *buck2_gpio;
37};
38
39static const unsigned int charger_current_table[] = {
40 90000, 380000, 475000, 550000, 570000, 600000, 700000, 800000,
41};
42
43static int max8998_get_enable_register(struct regulator_dev *rdev,
44 int *reg, int *shift)
45{
46 int ldo = rdev_get_id(rdev);
47
48 switch (ldo) {
49 case MAX8998_LDO2 ... MAX8998_LDO5:
50 *reg = MAX8998_REG_ONOFF1;
51 *shift = 3 - (ldo - MAX8998_LDO2);
52 break;
53 case MAX8998_LDO6 ... MAX8998_LDO13:
54 *reg = MAX8998_REG_ONOFF2;
55 *shift = 7 - (ldo - MAX8998_LDO6);
56 break;
57 case MAX8998_LDO14 ... MAX8998_LDO17:
58 *reg = MAX8998_REG_ONOFF3;
59 *shift = 7 - (ldo - MAX8998_LDO14);
60 break;
61 case MAX8998_BUCK1 ... MAX8998_BUCK4:
62 *reg = MAX8998_REG_ONOFF1;
63 *shift = 7 - (ldo - MAX8998_BUCK1);
64 break;
65 case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
66 *reg = MAX8998_REG_ONOFF4;
67 *shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
68 break;
69 case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
70 *reg = MAX8998_REG_CHGR2;
71 *shift = 7 - (ldo - MAX8998_ESAFEOUT1);
72 break;
73 case MAX8998_CHARGER:
74 *reg = MAX8998_REG_CHGR2;
75 *shift = 0;
76 break;
77 default:
78 return -EINVAL;
79 }
80
81 return 0;
82}
83
84static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
85{
86 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
87 struct i2c_client *i2c = max8998->iodev->i2c;
88 int ret, reg, shift = 8;
89 u8 val;
90
91 ret = max8998_get_enable_register(rdev, reg: &reg, shift: &shift);
92 if (ret)
93 return ret;
94
95 ret = max8998_read_reg(i2c, reg, dest: &val);
96 if (ret)
97 return ret;
98
99 return val & (1 << shift);
100}
101
102static int max8998_ldo_is_enabled_inverted(struct regulator_dev *rdev)
103{
104 return (!max8998_ldo_is_enabled(rdev));
105}
106
107static int max8998_ldo_enable(struct regulator_dev *rdev)
108{
109 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
110 struct i2c_client *i2c = max8998->iodev->i2c;
111 int reg, shift = 8, ret;
112
113 ret = max8998_get_enable_register(rdev, reg: &reg, shift: &shift);
114 if (ret)
115 return ret;
116
117 return max8998_update_reg(i2c, reg, val: 1<<shift, mask: 1<<shift);
118}
119
120static int max8998_ldo_disable(struct regulator_dev *rdev)
121{
122 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
123 struct i2c_client *i2c = max8998->iodev->i2c;
124 int reg, shift = 8, ret;
125
126 ret = max8998_get_enable_register(rdev, reg: &reg, shift: &shift);
127 if (ret)
128 return ret;
129
130 return max8998_update_reg(i2c, reg, val: 0, mask: 1<<shift);
131}
132
133static int max8998_get_voltage_register(struct regulator_dev *rdev,
134 int *_reg, int *_shift, int *_mask)
135{
136 int ldo = rdev_get_id(rdev);
137 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
138 int reg, shift = 0, mask = 0xff;
139
140 switch (ldo) {
141 case MAX8998_LDO2 ... MAX8998_LDO3:
142 reg = MAX8998_REG_LDO2_LDO3;
143 mask = 0xf;
144 if (ldo == MAX8998_LDO2)
145 shift = 4;
146 else
147 shift = 0;
148 break;
149 case MAX8998_LDO4 ... MAX8998_LDO7:
150 reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
151 break;
152 case MAX8998_LDO8 ... MAX8998_LDO9:
153 reg = MAX8998_REG_LDO8_LDO9;
154 mask = 0xf;
155 if (ldo == MAX8998_LDO8)
156 shift = 4;
157 else
158 shift = 0;
159 break;
160 case MAX8998_LDO10 ... MAX8998_LDO11:
161 reg = MAX8998_REG_LDO10_LDO11;
162 if (ldo == MAX8998_LDO10) {
163 shift = 5;
164 mask = 0x7;
165 } else {
166 shift = 0;
167 mask = 0x1f;
168 }
169 break;
170 case MAX8998_LDO12 ... MAX8998_LDO17:
171 reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
172 break;
173 case MAX8998_BUCK1:
174 reg = MAX8998_REG_BUCK1_VOLTAGE1 + max8998->buck1_idx;
175 break;
176 case MAX8998_BUCK2:
177 reg = MAX8998_REG_BUCK2_VOLTAGE1 + max8998->buck2_idx;
178 break;
179 case MAX8998_BUCK3:
180 reg = MAX8998_REG_BUCK3;
181 break;
182 case MAX8998_BUCK4:
183 reg = MAX8998_REG_BUCK4;
184 break;
185 default:
186 return -EINVAL;
187 }
188
189 *_reg = reg;
190 *_shift = shift;
191 *_mask = mask;
192
193 return 0;
194}
195
196static int max8998_get_voltage_sel(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 = 0, mask, ret;
201 u8 val;
202
203 ret = max8998_get_voltage_register(rdev, reg: &reg, shift: &shift, mask: &mask);
204 if (ret)
205 return ret;
206
207 ret = max8998_read_reg(i2c, reg, dest: &val);
208 if (ret)
209 return ret;
210
211 val >>= shift;
212 val &= mask;
213
214 return val;
215}
216
217static int max8998_set_voltage_ldo_sel(struct regulator_dev *rdev,
218 unsigned selector)
219{
220 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
221 struct i2c_client *i2c = max8998->iodev->i2c;
222 int reg, shift = 0, mask, ret;
223
224 ret = max8998_get_voltage_register(rdev, reg: &reg, shift: &shift, mask: &mask);
225 if (ret)
226 return ret;
227
228 ret = max8998_update_reg(i2c, reg, val: selector<<shift, mask: mask<<shift);
229
230 return ret;
231}
232
233static inline void buck1_gpio_set(struct gpio_desc *gpio1, struct gpio_desc *gpio2, int v)
234{
235 gpiod_set_value(desc: gpio1, value: v & 0x1);
236 gpiod_set_value(desc: gpio2, value: (v >> 1) & 0x1);
237}
238
239static inline void buck2_gpio_set(struct gpio_desc *gpio, int v)
240{
241 gpiod_set_value(desc: gpio, value: v & 0x1);
242}
243
244static int max8998_set_voltage_buck_sel(struct regulator_dev *rdev,
245 unsigned selector)
246{
247 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
248 struct max8998_platform_data *pdata = max8998->iodev->pdata;
249 struct i2c_client *i2c = max8998->iodev->i2c;
250 int buck = rdev_get_id(rdev);
251 int reg, shift = 0, mask, ret, j;
252 static u8 buck1_last_val;
253
254 ret = max8998_get_voltage_register(rdev, reg: &reg, shift: &shift, mask: &mask);
255 if (ret)
256 return ret;
257
258 switch (buck) {
259 case MAX8998_BUCK1:
260 dev_dbg(max8998->dev,
261 "BUCK1, selector:%d, buck1_vol1:%d, buck1_vol2:%d\n"
262 "buck1_vol3:%d, buck1_vol4:%d\n",
263 selector, max8998->buck1_vol[0], max8998->buck1_vol[1],
264 max8998->buck1_vol[2], max8998->buck1_vol[3]);
265
266 if (max8998->buck1_gpio1 && max8998->buck1_gpio2) {
267
268 /* check if requested voltage */
269 /* value is already defined */
270 for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
271 if (max8998->buck1_vol[j] == selector) {
272 max8998->buck1_idx = j;
273 buck1_gpio_set(gpio1: max8998->buck1_gpio1,
274 gpio2: max8998->buck1_gpio2, v: j);
275 goto buck1_exit;
276 }
277 }
278
279 if (pdata->buck_voltage_lock)
280 return -EINVAL;
281
282 /* no predefine regulator found */
283 max8998->buck1_idx = (buck1_last_val % 2) + 2;
284 dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
285 max8998->buck1_idx);
286 max8998->buck1_vol[max8998->buck1_idx] = selector;
287 ret = max8998_get_voltage_register(rdev, reg: &reg,
288 shift: &shift,
289 mask: &mask);
290 ret = max8998_write_reg(i2c, reg, value: selector);
291 buck1_gpio_set(gpio1: max8998->buck1_gpio1,
292 gpio2: max8998->buck1_gpio2, v: max8998->buck1_idx);
293 buck1_last_val++;
294buck1_exit:
295 dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
296 i2c->name, gpiod_get_value(max8998->buck1_gpio1),
297 gpiod_get_value(max8998->buck1_gpio2));
298 break;
299 } else {
300 ret = max8998_write_reg(i2c, reg, value: selector);
301 }
302 break;
303
304 case MAX8998_BUCK2:
305 dev_dbg(max8998->dev,
306 "BUCK2, selector:%d buck2_vol1:%d, buck2_vol2:%d\n",
307 selector, max8998->buck2_vol[0], max8998->buck2_vol[1]);
308 if (max8998->buck2_gpio) {
309 /* check if requested voltage */
310 /* value is already defined */
311 for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
312 if (max8998->buck2_vol[j] == selector) {
313 max8998->buck2_idx = j;
314 buck2_gpio_set(gpio: max8998->buck2_gpio, v: j);
315 goto buck2_exit;
316 }
317 }
318
319 if (pdata->buck_voltage_lock)
320 return -EINVAL;
321
322 max8998_get_voltage_register(rdev,
323 reg: &reg, shift: &shift, mask: &mask);
324 ret = max8998_write_reg(i2c, reg, value: selector);
325 max8998->buck2_vol[max8998->buck2_idx] = selector;
326 buck2_gpio_set(gpio: max8998->buck2_gpio, v: max8998->buck2_idx);
327buck2_exit:
328 dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
329 gpiod_get_value(max8998->buck2_gpio));
330 } else {
331 ret = max8998_write_reg(i2c, reg, value: selector);
332 }
333 break;
334
335 case MAX8998_BUCK3:
336 case MAX8998_BUCK4:
337 ret = max8998_update_reg(i2c, reg, val: selector<<shift,
338 mask: mask<<shift);
339 break;
340 }
341
342 return ret;
343}
344
345static int max8998_set_voltage_buck_time_sel(struct regulator_dev *rdev,
346 unsigned int old_selector,
347 unsigned int new_selector)
348{
349 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
350 struct i2c_client *i2c = max8998->iodev->i2c;
351 int buck = rdev_get_id(rdev);
352 u8 val = 0;
353 int difference, ret;
354
355 if (buck < MAX8998_BUCK1 || buck > MAX8998_BUCK4)
356 return -EINVAL;
357
358 /* Voltage stabilization */
359 ret = max8998_read_reg(i2c, reg: MAX8998_REG_ONOFF4, dest: &val);
360 if (ret)
361 return ret;
362
363 /* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
364 /* MAX8998 has ENRAMP bit implemented, so test it*/
365 if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
366 return 0;
367
368 difference = (new_selector - old_selector) * rdev->desc->uV_step / 1000;
369 if (difference > 0)
370 return DIV_ROUND_UP(difference, (val & 0x0f) + 1);
371
372 return 0;
373}
374
375static int max8998_set_current_limit(struct regulator_dev *rdev,
376 int min_uA, int max_uA)
377{
378 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
379 struct i2c_client *i2c = max8998->iodev->i2c;
380 unsigned int n_currents = rdev->desc->n_current_limits;
381 int i, sel = -1;
382
383 if (n_currents == 0)
384 return -EINVAL;
385
386 if (rdev->desc->curr_table) {
387 const unsigned int *curr_table = rdev->desc->curr_table;
388 bool ascend = curr_table[n_currents - 1] > curr_table[0];
389
390 /* search for closest to maximum */
391 if (ascend) {
392 for (i = n_currents - 1; i >= 0; i--) {
393 if (min_uA <= curr_table[i] &&
394 curr_table[i] <= max_uA) {
395 sel = i;
396 break;
397 }
398 }
399 } else {
400 for (i = 0; i < n_currents; i++) {
401 if (min_uA <= curr_table[i] &&
402 curr_table[i] <= max_uA) {
403 sel = i;
404 break;
405 }
406 }
407 }
408 }
409
410 if (sel < 0)
411 return -EINVAL;
412
413 sel <<= ffs(rdev->desc->csel_mask) - 1;
414
415 return max8998_update_reg(i2c, reg: rdev->desc->csel_reg,
416 val: sel, mask: rdev->desc->csel_mask);
417}
418
419static int max8998_get_current_limit(struct regulator_dev *rdev)
420{
421 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
422 struct i2c_client *i2c = max8998->iodev->i2c;
423 u8 val;
424 int ret;
425
426 ret = max8998_read_reg(i2c, reg: rdev->desc->csel_reg, dest: &val);
427 if (ret != 0)
428 return ret;
429
430 val &= rdev->desc->csel_mask;
431 val >>= ffs(rdev->desc->csel_mask) - 1;
432
433 if (rdev->desc->curr_table) {
434 if (val >= rdev->desc->n_current_limits)
435 return -EINVAL;
436
437 return rdev->desc->curr_table[val];
438 }
439
440 return -EINVAL;
441}
442
443static const struct regulator_ops max8998_ldo_ops = {
444 .list_voltage = regulator_list_voltage_linear,
445 .map_voltage = regulator_map_voltage_linear,
446 .is_enabled = max8998_ldo_is_enabled,
447 .enable = max8998_ldo_enable,
448 .disable = max8998_ldo_disable,
449 .get_voltage_sel = max8998_get_voltage_sel,
450 .set_voltage_sel = max8998_set_voltage_ldo_sel,
451};
452
453static const struct regulator_ops max8998_buck_ops = {
454 .list_voltage = regulator_list_voltage_linear,
455 .map_voltage = regulator_map_voltage_linear,
456 .is_enabled = max8998_ldo_is_enabled,
457 .enable = max8998_ldo_enable,
458 .disable = max8998_ldo_disable,
459 .get_voltage_sel = max8998_get_voltage_sel,
460 .set_voltage_sel = max8998_set_voltage_buck_sel,
461 .set_voltage_time_sel = max8998_set_voltage_buck_time_sel,
462};
463
464static const struct regulator_ops max8998_charger_ops = {
465 .set_current_limit = max8998_set_current_limit,
466 .get_current_limit = max8998_get_current_limit,
467 .is_enabled = max8998_ldo_is_enabled_inverted,
468 /* Swapped as register is inverted */
469 .enable = max8998_ldo_disable,
470 .disable = max8998_ldo_enable,
471};
472
473static const struct regulator_ops max8998_others_ops = {
474 .is_enabled = max8998_ldo_is_enabled,
475 .enable = max8998_ldo_enable,
476 .disable = max8998_ldo_disable,
477};
478
479#define MAX8998_LINEAR_REG(_name, _ops, _min, _step, _max) \
480 { \
481 .name = #_name, \
482 .id = MAX8998_##_name, \
483 .ops = _ops, \
484 .min_uV = (_min), \
485 .uV_step = (_step), \
486 .n_voltages = ((_max) - (_min)) / (_step) + 1, \
487 .type = REGULATOR_VOLTAGE, \
488 .owner = THIS_MODULE, \
489 }
490
491#define MAX8998_CURRENT_REG(_name, _ops, _table, _reg, _mask) \
492 { \
493 .name = #_name, \
494 .id = MAX8998_##_name, \
495 .ops = _ops, \
496 .curr_table = _table, \
497 .n_current_limits = ARRAY_SIZE(_table), \
498 .csel_reg = _reg, \
499 .csel_mask = _mask, \
500 .type = REGULATOR_CURRENT, \
501 .owner = THIS_MODULE, \
502 }
503
504#define MAX8998_OTHERS_REG(_name, _id) \
505 { \
506 .name = #_name, \
507 .id = _id, \
508 .ops = &max8998_others_ops, \
509 .type = REGULATOR_VOLTAGE, \
510 .owner = THIS_MODULE, \
511 }
512
513static const struct regulator_desc regulators[] = {
514 MAX8998_LINEAR_REG(LDO2, &max8998_ldo_ops, 800000, 50000, 1300000),
515 MAX8998_LINEAR_REG(LDO3, &max8998_ldo_ops, 800000, 50000, 1300000),
516 MAX8998_LINEAR_REG(LDO4, &max8998_ldo_ops, 1600000, 100000, 3600000),
517 MAX8998_LINEAR_REG(LDO5, &max8998_ldo_ops, 1600000, 100000, 3600000),
518 MAX8998_LINEAR_REG(LDO6, &max8998_ldo_ops, 1600000, 100000, 3600000),
519 MAX8998_LINEAR_REG(LDO7, &max8998_ldo_ops, 1600000, 100000, 3600000),
520 MAX8998_LINEAR_REG(LDO8, &max8998_ldo_ops, 3000000, 100000, 3600000),
521 MAX8998_LINEAR_REG(LDO9, &max8998_ldo_ops, 2800000, 100000, 3100000),
522 MAX8998_LINEAR_REG(LDO10, &max8998_ldo_ops, 950000, 50000, 1300000),
523 MAX8998_LINEAR_REG(LDO11, &max8998_ldo_ops, 1600000, 100000, 3600000),
524 MAX8998_LINEAR_REG(LDO12, &max8998_ldo_ops, 800000, 100000, 3300000),
525 MAX8998_LINEAR_REG(LDO13, &max8998_ldo_ops, 800000, 100000, 3300000),
526 MAX8998_LINEAR_REG(LDO14, &max8998_ldo_ops, 1200000, 100000, 3300000),
527 MAX8998_LINEAR_REG(LDO15, &max8998_ldo_ops, 1200000, 100000, 3300000),
528 MAX8998_LINEAR_REG(LDO16, &max8998_ldo_ops, 1600000, 100000, 3600000),
529 MAX8998_LINEAR_REG(LDO17, &max8998_ldo_ops, 1600000, 100000, 3600000),
530 MAX8998_LINEAR_REG(BUCK1, &max8998_buck_ops, 750000, 25000, 1525000),
531 MAX8998_LINEAR_REG(BUCK2, &max8998_buck_ops, 750000, 25000, 1525000),
532 MAX8998_LINEAR_REG(BUCK3, &max8998_buck_ops, 1600000, 100000, 3600000),
533 MAX8998_LINEAR_REG(BUCK4, &max8998_buck_ops, 800000, 100000, 2300000),
534 MAX8998_OTHERS_REG(EN32KHz-AP, MAX8998_EN32KHZ_AP),
535 MAX8998_OTHERS_REG(EN32KHz-CP, MAX8998_EN32KHZ_CP),
536 MAX8998_OTHERS_REG(ENVICHG, MAX8998_ENVICHG),
537 MAX8998_OTHERS_REG(ESAFEOUT1, MAX8998_ESAFEOUT1),
538 MAX8998_OTHERS_REG(ESAFEOUT2, MAX8998_ESAFEOUT2),
539 MAX8998_CURRENT_REG(CHARGER, &max8998_charger_ops,
540 charger_current_table, MAX8998_REG_CHGR1, 0x7),
541};
542
543static int max8998_pmic_dt_parse_pdata(struct max8998_dev *iodev,
544 struct max8998_platform_data *pdata)
545{
546 struct device_node *pmic_np = iodev->dev->of_node;
547 struct device_node *regulators_np, *reg_np;
548 struct max8998_regulator_data *rdata;
549 unsigned int i;
550 int ret;
551
552 regulators_np = of_get_child_by_name(node: pmic_np, name: "regulators");
553 if (!regulators_np) {
554 dev_err(iodev->dev, "could not find regulators sub-node\n");
555 return -EINVAL;
556 }
557
558 /* count the number of regulators to be supported in pmic */
559 pdata->num_regulators = of_get_child_count(np: regulators_np);
560
561 rdata = devm_kcalloc(dev: iodev->dev,
562 n: pdata->num_regulators, size: sizeof(*rdata),
563 GFP_KERNEL);
564 if (!rdata) {
565 of_node_put(node: regulators_np);
566 return -ENOMEM;
567 }
568
569 pdata->regulators = rdata;
570 for (i = 0; i < ARRAY_SIZE(regulators); ++i) {
571 reg_np = of_get_child_by_name(node: regulators_np,
572 name: regulators[i].name);
573 if (!reg_np)
574 continue;
575
576 rdata->id = regulators[i].id;
577 rdata->initdata = of_get_regulator_init_data(dev: iodev->dev,
578 node: reg_np,
579 desc: &regulators[i]);
580 rdata->reg_node = reg_np;
581 ++rdata;
582 }
583 pdata->num_regulators = rdata - pdata->regulators;
584
585 of_node_put(node: reg_np);
586 of_node_put(node: regulators_np);
587
588 pdata->buck_voltage_lock = of_property_read_bool(np: pmic_np, propname: "max8998,pmic-buck-voltage-lock");
589
590 ret = of_property_read_u32(np: pmic_np,
591 propname: "max8998,pmic-buck1-default-dvs-idx",
592 out_value: &pdata->buck1_default_idx);
593 if (!ret && pdata->buck1_default_idx >= 4) {
594 pdata->buck1_default_idx = 0;
595 dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
596 }
597
598 ret = of_property_read_u32(np: pmic_np,
599 propname: "max8998,pmic-buck2-default-dvs-idx",
600 out_value: &pdata->buck2_default_idx);
601 if (!ret && pdata->buck2_default_idx >= 2) {
602 pdata->buck2_default_idx = 0;
603 dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
604 }
605
606 ret = of_property_read_u32_array(np: pmic_np,
607 propname: "max8998,pmic-buck1-dvs-voltage",
608 out_values: pdata->buck1_voltage,
609 ARRAY_SIZE(pdata->buck1_voltage));
610 if (ret) {
611 dev_err(iodev->dev, "buck1 voltages not specified\n");
612 return -EINVAL;
613 }
614
615 ret = of_property_read_u32_array(np: pmic_np,
616 propname: "max8998,pmic-buck2-dvs-voltage",
617 out_values: pdata->buck2_voltage,
618 ARRAY_SIZE(pdata->buck2_voltage));
619 if (ret) {
620 dev_err(iodev->dev, "buck2 voltages not specified\n");
621 return -EINVAL;
622 }
623
624 return 0;
625}
626
627static int max8998_pmic_probe(struct platform_device *pdev)
628{
629 struct max8998_dev *iodev = dev_get_drvdata(dev: pdev->dev.parent);
630 struct max8998_platform_data *pdata = iodev->pdata;
631 struct regulator_config config = { };
632 struct regulator_dev *rdev;
633 struct max8998_data *max8998;
634 struct i2c_client *i2c;
635 enum gpiod_flags flags;
636 int i, ret;
637 unsigned int v;
638
639 if (!pdata) {
640 dev_err(pdev->dev.parent, "No platform init data supplied\n");
641 return -ENODEV;
642 }
643
644 if (IS_ENABLED(CONFIG_OF) && iodev->dev->of_node) {
645 ret = max8998_pmic_dt_parse_pdata(iodev, pdata);
646 if (ret)
647 return ret;
648 }
649
650 max8998 = devm_kzalloc(dev: &pdev->dev, size: sizeof(struct max8998_data),
651 GFP_KERNEL);
652 if (!max8998)
653 return -ENOMEM;
654
655 max8998->dev = &pdev->dev;
656 max8998->iodev = iodev;
657 max8998->num_regulators = pdata->num_regulators;
658 platform_set_drvdata(pdev, data: max8998);
659 i2c = max8998->iodev->i2c;
660
661 max8998->buck1_idx = pdata->buck1_default_idx;
662 max8998->buck2_idx = pdata->buck2_default_idx;
663
664 /* Check if MAX8998 voltage selection GPIOs are defined */
665 flags = (max8998->buck1_idx & BIT(0)) ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
666 max8998->buck1_gpio1 = devm_gpiod_get_index_optional(dev: iodev->dev,
667 con_id: "max8998,pmic-buck1-dvs",
668 index: 0,
669 flags);
670 if (IS_ERR(ptr: max8998->buck1_gpio1))
671 return dev_err_probe(dev: &pdev->dev, err: PTR_ERR(ptr: max8998->buck1_gpio1),
672 fmt: "could not get BUCK1 GPIO1\n");
673 gpiod_set_consumer_name(desc: max8998->buck1_gpio1, name: "MAX8998 BUCK1_SET1");
674
675 flags = (max8998->buck1_idx & BIT(1)) ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
676 max8998->buck1_gpio2 = devm_gpiod_get_index_optional(dev: iodev->dev,
677 con_id: "max8998,pmic-buck1-dvs",
678 index: 1,
679 flags);
680 if (IS_ERR(ptr: max8998->buck1_gpio2))
681 return dev_err_probe(dev: &pdev->dev, err: PTR_ERR(ptr: max8998->buck1_gpio2),
682 fmt: "could not get BUCK1 GPIO2\n");
683 gpiod_set_consumer_name(desc: max8998->buck1_gpio1, name: "MAX8998 BUCK1_SET2");
684
685 flags = (max8998->buck2_idx & BIT(0)) ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
686 max8998->buck2_gpio = devm_gpiod_get_index_optional(dev: iodev->dev,
687 con_id: "max8998,pmic-buck2-dvs",
688 index: 0,
689 flags);
690 if (IS_ERR(ptr: max8998->buck2_gpio))
691 return dev_err_probe(dev: &pdev->dev, err: PTR_ERR(ptr: max8998->buck2_gpio),
692 fmt: "could not get BUCK2 GPIO\n");
693 gpiod_set_consumer_name(desc: max8998->buck1_gpio1, name: "MAX8998 BUCK2_SET3");
694
695 if (max8998->buck1_gpio1 && max8998->buck1_gpio2) {
696 /* Set predefined values for BUCK1 registers */
697 for (v = 0; v < ARRAY_SIZE(pdata->buck1_voltage); ++v) {
698 int index = MAX8998_BUCK1 - MAX8998_LDO2;
699
700 i = 0;
701 while (regulators[index].min_uV +
702 regulators[index].uV_step * i
703 < pdata->buck1_voltage[v])
704 i++;
705
706 max8998->buck1_vol[v] = i;
707 ret = max8998_write_reg(i2c,
708 reg: MAX8998_REG_BUCK1_VOLTAGE1 + v, value: i);
709 if (ret)
710 return ret;
711 }
712 }
713
714 if (max8998->buck2_gpio) {
715 /* Set predefined values for BUCK2 registers */
716 for (v = 0; v < ARRAY_SIZE(pdata->buck2_voltage); ++v) {
717 int index = MAX8998_BUCK2 - MAX8998_LDO2;
718
719 i = 0;
720 while (regulators[index].min_uV +
721 regulators[index].uV_step * i
722 < pdata->buck2_voltage[v])
723 i++;
724
725 max8998->buck2_vol[v] = i;
726 ret = max8998_write_reg(i2c,
727 reg: MAX8998_REG_BUCK2_VOLTAGE1 + v, value: i);
728 if (ret)
729 return ret;
730 }
731 }
732
733 for (i = 0; i < pdata->num_regulators; i++) {
734 int index = pdata->regulators[i].id - MAX8998_LDO2;
735
736 config.dev = max8998->dev;
737 config.of_node = pdata->regulators[i].reg_node;
738 config.init_data = pdata->regulators[i].initdata;
739 config.driver_data = max8998;
740
741 rdev = devm_regulator_register(dev: &pdev->dev, regulator_desc: &regulators[index],
742 config: &config);
743 if (IS_ERR(ptr: rdev)) {
744 ret = PTR_ERR(ptr: rdev);
745 dev_err(max8998->dev, "regulator %s init failed (%d)\n",
746 regulators[index].name, ret);
747 return ret;
748 }
749 }
750
751 return 0;
752}
753
754static const struct platform_device_id max8998_pmic_id[] = {
755 { "max8998-pmic", TYPE_MAX8998 },
756 { "lp3974-pmic", TYPE_LP3974 },
757 { }
758};
759MODULE_DEVICE_TABLE(platform, max8998_pmic_id);
760
761static struct platform_driver max8998_pmic_driver = {
762 .driver = {
763 .name = "max8998-pmic",
764 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
765 },
766 .probe = max8998_pmic_probe,
767 .id_table = max8998_pmic_id,
768};
769
770static int __init max8998_pmic_init(void)
771{
772 return platform_driver_register(&max8998_pmic_driver);
773}
774subsys_initcall(max8998_pmic_init);
775
776static void __exit max8998_pmic_cleanup(void)
777{
778 platform_driver_unregister(&max8998_pmic_driver);
779}
780module_exit(max8998_pmic_cleanup);
781
782MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
783MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
784MODULE_LICENSE("GPL");
785

source code of linux/drivers/regulator/max8998.c