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1// SPDX-License-Identifier: GPL-2.0+
2//
3// max8998.c - Voltage regulator driver for the Maxim 8998
4//
5// Copyright (C) 2009-2010 Samsung Electronics
6// Kyungmin Park <kyungmin.park@samsung.com>
7// Marek Szyprowski <m.szyprowski@samsung.com>
8
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/i2c.h>
12#include <linux/err.h>
13#include <linux/gpio.h>
14#include <linux/slab.h>
15#include <linux/interrupt.h>
16#include <linux/mutex.h>
17#include <linux/of.h>
18#include <linux/of_gpio.h>
19#include <linux/platform_device.h>
20#include <linux/regulator/driver.h>
21#include <linux/regulator/of_regulator.h>
22#include <linux/mfd/max8998.h>
23#include <linux/mfd/max8998-private.h>
24
25struct max8998_data {
26 struct device *dev;
27 struct max8998_dev *iodev;
28 int num_regulators;
29 u8 buck1_vol[4]; /* voltages for selection */
30 u8 buck2_vol[2];
31 unsigned int buck1_idx; /* index to last changed voltage */
32 /* value in a set */
33 unsigned int buck2_idx;
34};
35
36static const unsigned int charger_current_table[] = {
37 90000, 380000, 475000, 550000, 570000, 600000, 700000, 800000,
38};
39
40static int max8998_get_enable_register(struct regulator_dev *rdev,
41 int *reg, int *shift)
42{
43 int ldo = rdev_get_id(rdev);
44
45 switch (ldo) {
46 case MAX8998_LDO2 ... MAX8998_LDO5:
47 *reg = MAX8998_REG_ONOFF1;
48 *shift = 3 - (ldo - MAX8998_LDO2);
49 break;
50 case MAX8998_LDO6 ... MAX8998_LDO13:
51 *reg = MAX8998_REG_ONOFF2;
52 *shift = 7 - (ldo - MAX8998_LDO6);
53 break;
54 case MAX8998_LDO14 ... MAX8998_LDO17:
55 *reg = MAX8998_REG_ONOFF3;
56 *shift = 7 - (ldo - MAX8998_LDO14);
57 break;
58 case MAX8998_BUCK1 ... MAX8998_BUCK4:
59 *reg = MAX8998_REG_ONOFF1;
60 *shift = 7 - (ldo - MAX8998_BUCK1);
61 break;
62 case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
63 *reg = MAX8998_REG_ONOFF4;
64 *shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
65 break;
66 case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
67 *reg = MAX8998_REG_CHGR2;
68 *shift = 7 - (ldo - MAX8998_ESAFEOUT1);
69 break;
70 case MAX8998_CHARGER:
71 *reg = MAX8998_REG_CHGR2;
72 *shift = 0;
73 break;
74 default:
75 return -EINVAL;
76 }
77
78 return 0;
79}
80
81static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
82{
83 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
84 struct i2c_client *i2c = max8998->iodev->i2c;
85 int ret, reg, shift = 8;
86 u8 val;
87
88 ret = max8998_get_enable_register(rdev, ®, &shift);
89 if (ret)
90 return ret;
91
92 ret = max8998_read_reg(i2c, reg, &val);
93 if (ret)
94 return ret;
95
96 return val & (1 << shift);
97}
98
99static int max8998_ldo_is_enabled_inverted(struct regulator_dev *rdev)
100{
101 return (!max8998_ldo_is_enabled(rdev));
102}
103
104static int max8998_ldo_enable(struct regulator_dev *rdev)
105{
106 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
107 struct i2c_client *i2c = max8998->iodev->i2c;
108 int reg, shift = 8, ret;
109
110 ret = max8998_get_enable_register(rdev, ®, &shift);
111 if (ret)
112 return ret;
113
114 return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
115}
116
117static int max8998_ldo_disable(struct regulator_dev *rdev)
118{
119 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
120 struct i2c_client *i2c = max8998->iodev->i2c;
121 int reg, shift = 8, ret;
122
123 ret = max8998_get_enable_register(rdev, ®, &shift);
124 if (ret)
125 return ret;
126
127 return max8998_update_reg(i2c, reg, 0, 1<<shift);
128}
129
130static int max8998_get_voltage_register(struct regulator_dev *rdev,
131 int *_reg, int *_shift, int *_mask)
132{
133 int ldo = rdev_get_id(rdev);
134 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
135 int reg, shift = 0, mask = 0xff;
136
137 switch (ldo) {
138 case MAX8998_LDO2 ... MAX8998_LDO3:
139 reg = MAX8998_REG_LDO2_LDO3;
140 mask = 0xf;
141 if (ldo == MAX8998_LDO2)
142 shift = 4;
143 else
144 shift = 0;
145 break;
146 case MAX8998_LDO4 ... MAX8998_LDO7:
147 reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
148 break;
149 case MAX8998_LDO8 ... MAX8998_LDO9:
150 reg = MAX8998_REG_LDO8_LDO9;
151 mask = 0xf;
152 if (ldo == MAX8998_LDO8)
153 shift = 4;
154 else
155 shift = 0;
156 break;
157 case MAX8998_LDO10 ... MAX8998_LDO11:
158 reg = MAX8998_REG_LDO10_LDO11;
159 if (ldo == MAX8998_LDO10) {
160 shift = 5;
161 mask = 0x7;
162 } else {
163 shift = 0;
164 mask = 0x1f;
165 }
166 break;
167 case MAX8998_LDO12 ... MAX8998_LDO17:
168 reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
169 break;
170 case MAX8998_BUCK1:
171 reg = MAX8998_REG_BUCK1_VOLTAGE1 + max8998->buck1_idx;
172 break;
173 case MAX8998_BUCK2:
174 reg = MAX8998_REG_BUCK2_VOLTAGE1 + max8998->buck2_idx;
175 break;
176 case MAX8998_BUCK3:
177 reg = MAX8998_REG_BUCK3;
178 break;
179 case MAX8998_BUCK4:
180 reg = MAX8998_REG_BUCK4;
181 break;
182 default:
183 return -EINVAL;
184 }
185
186 *_reg = reg;
187 *_shift = shift;
188 *_mask = mask;
189
190 return 0;
191}
192
193static int max8998_get_voltage_sel(struct regulator_dev *rdev)
194{
195 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
196 struct i2c_client *i2c = max8998->iodev->i2c;
197 int reg, shift = 0, mask, ret;
198 u8 val;
199
200 ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
201 if (ret)
202 return ret;
203
204 ret = max8998_read_reg(i2c, reg, &val);
205 if (ret)
206 return ret;
207
208 val >>= shift;
209 val &= mask;
210
211 return val;
212}
213
214static int max8998_set_voltage_ldo_sel(struct regulator_dev *rdev,
215 unsigned selector)
216{
217 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
218 struct i2c_client *i2c = max8998->iodev->i2c;
219 int reg, shift = 0, mask, ret;
220
221 ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
222 if (ret)
223 return ret;
224
225 ret = max8998_update_reg(i2c, reg, selector<<shift, mask<<shift);
226
227 return ret;
228}
229
230static inline void buck1_gpio_set(int gpio1, int gpio2, int v)
231{
232 gpio_set_value(gpio1, v & 0x1);
233 gpio_set_value(gpio2, (v >> 1) & 0x1);
234}
235
236static inline void buck2_gpio_set(int gpio, int v)
237{
238 gpio_set_value(gpio, v & 0x1);
239}
240
241static int max8998_set_voltage_buck_sel(struct regulator_dev *rdev,
242 unsigned selector)
243{
244 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
245 struct max8998_platform_data *pdata = max8998->iodev->pdata;
246 struct i2c_client *i2c = max8998->iodev->i2c;
247 int buck = rdev_get_id(rdev);
248 int reg, shift = 0, mask, ret, j;
249 static u8 buck1_last_val;
250
251 ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
252 if (ret)
253 return ret;
254
255 switch (buck) {
256 case MAX8998_BUCK1:
257 dev_dbg(max8998->dev,
258 "BUCK1, selector:%d, buck1_vol1:%d, buck1_vol2:%d\n"
259 "buck1_vol3:%d, buck1_vol4:%d\n",
260 selector, max8998->buck1_vol[0], max8998->buck1_vol[1],
261 max8998->buck1_vol[2], max8998->buck1_vol[3]);
262
263 if (gpio_is_valid(pdata->buck1_set1) &&
264 gpio_is_valid(pdata->buck1_set2)) {
265
266 /* check if requested voltage */
267 /* value is already defined */
268 for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
269 if (max8998->buck1_vol[j] == selector) {
270 max8998->buck1_idx = j;
271 buck1_gpio_set(pdata->buck1_set1,
272 pdata->buck1_set2, j);
273 goto buck1_exit;
274 }
275 }
276
277 if (pdata->buck_voltage_lock)
278 return -EINVAL;
279
280 /* no predefine regulator found */
281 max8998->buck1_idx = (buck1_last_val % 2) + 2;
282 dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
283 max8998->buck1_idx);
284 max8998->buck1_vol[max8998->buck1_idx] = selector;
285 ret = max8998_get_voltage_register(rdev, ®,
286 &shift,
287 &mask);
288 ret = max8998_write_reg(i2c, reg, selector);
289 buck1_gpio_set(pdata->buck1_set1,
290 pdata->buck1_set2, max8998->buck1_idx);
291 buck1_last_val++;
292buck1_exit:
293 dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
294 i2c->name, gpio_get_value(pdata->buck1_set1),
295 gpio_get_value(pdata->buck1_set2));
296 break;
297 } else {
298 ret = max8998_write_reg(i2c, reg, selector);
299 }
300 break;
301
302 case MAX8998_BUCK2:
303 dev_dbg(max8998->dev,
304 "BUCK2, selector:%d buck2_vol1:%d, buck2_vol2:%d\n",
305 selector, max8998->buck2_vol[0], max8998->buck2_vol[1]);
306 if (gpio_is_valid(pdata->buck2_set3)) {
307
308 /* check if requested voltage */
309 /* value is already defined */
310 for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
311 if (max8998->buck2_vol[j] == selector) {
312 max8998->buck2_idx = j;
313 buck2_gpio_set(pdata->buck2_set3, j);
314 goto buck2_exit;
315 }
316 }
317
318 if (pdata->buck_voltage_lock)
319 return -EINVAL;
320
321 max8998_get_voltage_register(rdev,
322 ®, &shift, &mask);
323 ret = max8998_write_reg(i2c, reg, selector);
324 max8998->buck2_vol[max8998->buck2_idx] = selector;
325 buck2_gpio_set(pdata->buck2_set3, max8998->buck2_idx);
326buck2_exit:
327 dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
328 gpio_get_value(pdata->buck2_set3));
329 } else {
330 ret = max8998_write_reg(i2c, reg, selector);
331 }
332 break;
333
334 case MAX8998_BUCK3:
335 case MAX8998_BUCK4:
336 ret = max8998_update_reg(i2c, reg, selector<<shift,
337 mask<<shift);
338 break;
339 }
340
341 return ret;
342}
343
344static int max8998_set_voltage_buck_time_sel(struct regulator_dev *rdev,
345 unsigned int old_selector,
346 unsigned int new_selector)
347{
348 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
349 struct i2c_client *i2c = max8998->iodev->i2c;
350 int buck = rdev_get_id(rdev);
351 u8 val = 0;
352 int difference, ret;
353
354 if (buck < MAX8998_BUCK1 || buck > MAX8998_BUCK4)
355 return -EINVAL;
356
357 /* Voltage stabilization */
358 ret = max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
359 if (ret)
360 return ret;
361
362 /* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
363 /* MAX8998 has ENRAMP bit implemented, so test it*/
364 if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
365 return 0;
366
367 difference = (new_selector - old_selector) * rdev->desc->uV_step / 1000;
368 if (difference > 0)
369 return DIV_ROUND_UP(difference, (val & 0x0f) + 1);
370
371 return 0;
372}
373
374static int max8998_set_current_limit(struct regulator_dev *rdev,
375 int min_uA, int max_uA)
376{
377 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
378 struct i2c_client *i2c = max8998->iodev->i2c;
379 unsigned int n_currents = rdev->desc->n_current_limits;
380 int i, sel = -1;
381
382 if (n_currents == 0)
383 return -EINVAL;
384
385 if (rdev->desc->curr_table) {
386 const unsigned int *curr_table = rdev->desc->curr_table;
387 bool ascend = curr_table[n_currents - 1] > curr_table[0];
388
389 /* search for closest to maximum */
390 if (ascend) {
391 for (i = n_currents - 1; i >= 0; i--) {
392 if (min_uA <= curr_table[i] &&
393 curr_table[i] <= max_uA) {
394 sel = i;
395 break;
396 }
397 }
398 } else {
399 for (i = 0; i < n_currents; i++) {
400 if (min_uA <= curr_table[i] &&
401 curr_table[i] <= max_uA) {
402 sel = i;
403 break;
404 }
405 }
406 }
407 }
408
409 if (sel < 0)
410 return -EINVAL;
411
412 sel <<= ffs(rdev->desc->csel_mask) - 1;
413
414 return max8998_update_reg(i2c, rdev->desc->csel_reg,
415 sel, rdev->desc->csel_mask);
416}
417
418static int max8998_get_current_limit(struct regulator_dev *rdev)
419{
420 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
421 struct i2c_client *i2c = max8998->iodev->i2c;
422 u8 val;
423 int ret;
424
425 ret = max8998_read_reg(i2c, rdev->desc->csel_reg, &val);
426 if (ret != 0)
427 return ret;
428
429 val &= rdev->desc->csel_mask;
430 val >>= ffs(rdev->desc->csel_mask) - 1;
431
432 if (rdev->desc->curr_table) {
433 if (val >= rdev->desc->n_current_limits)
434 return -EINVAL;
435
436 return rdev->desc->curr_table[val];
437 }
438
439 return -EINVAL;
440}
441
442static const struct regulator_ops max8998_ldo_ops = {
443 .list_voltage = regulator_list_voltage_linear,
444 .map_voltage = regulator_map_voltage_linear,
445 .is_enabled = max8998_ldo_is_enabled,
446 .enable = max8998_ldo_enable,
447 .disable = max8998_ldo_disable,
448 .get_voltage_sel = max8998_get_voltage_sel,
449 .set_voltage_sel = max8998_set_voltage_ldo_sel,
450};
451
452static const struct regulator_ops max8998_buck_ops = {
453 .list_voltage = regulator_list_voltage_linear,
454 .map_voltage = regulator_map_voltage_linear,
455 .is_enabled = max8998_ldo_is_enabled,
456 .enable = max8998_ldo_enable,
457 .disable = max8998_ldo_disable,
458 .get_voltage_sel = max8998_get_voltage_sel,
459 .set_voltage_sel = max8998_set_voltage_buck_sel,
460 .set_voltage_time_sel = max8998_set_voltage_buck_time_sel,
461};
462
463static const struct regulator_ops max8998_charger_ops = {
464 .set_current_limit = max8998_set_current_limit,
465 .get_current_limit = max8998_get_current_limit,
466 .is_enabled = max8998_ldo_is_enabled_inverted,
467 /* Swapped as register is inverted */
468 .enable = max8998_ldo_disable,
469 .disable = max8998_ldo_enable,
470};
471
472static const struct regulator_ops max8998_others_ops = {
473 .is_enabled = max8998_ldo_is_enabled,
474 .enable = max8998_ldo_enable,
475 .disable = max8998_ldo_disable,
476};
477
478#define MAX8998_LINEAR_REG(_name, _ops, _min, _step, _max) \
479 { \
480 .name = #_name, \
481 .id = MAX8998_##_name, \
482 .ops = _ops, \
483 .min_uV = (_min), \
484 .uV_step = (_step), \
485 .n_voltages = ((_max) - (_min)) / (_step) + 1, \
486 .type = REGULATOR_VOLTAGE, \
487 .owner = THIS_MODULE, \
488 }
489
490#define MAX8998_CURRENT_REG(_name, _ops, _table, _reg, _mask) \
491 { \
492 .name = #_name, \
493 .id = MAX8998_##_name, \
494 .ops = _ops, \
495 .curr_table = _table, \
496 .n_current_limits = ARRAY_SIZE(_table), \
497 .csel_reg = _reg, \
498 .csel_mask = _mask, \
499 .type = REGULATOR_CURRENT, \
500 .owner = THIS_MODULE, \
501 }
502
503#define MAX8998_OTHERS_REG(_name, _id) \
504 { \
505 .name = #_name, \
506 .id = _id, \
507 .ops = &max8998_others_ops, \
508 .type = REGULATOR_VOLTAGE, \
509 .owner = THIS_MODULE, \
510 }
511
512static const struct regulator_desc regulators[] = {
513 MAX8998_LINEAR_REG(LDO2, &max8998_ldo_ops, 800000, 50000, 1300000),
514 MAX8998_LINEAR_REG(LDO3, &max8998_ldo_ops, 800000, 50000, 1300000),
515 MAX8998_LINEAR_REG(LDO4, &max8998_ldo_ops, 1600000, 100000, 3600000),
516 MAX8998_LINEAR_REG(LDO5, &max8998_ldo_ops, 1600000, 100000, 3600000),
517 MAX8998_LINEAR_REG(LDO6, &max8998_ldo_ops, 1600000, 100000, 3600000),
518 MAX8998_LINEAR_REG(LDO7, &max8998_ldo_ops, 1600000, 100000, 3600000),
519 MAX8998_LINEAR_REG(LDO8, &max8998_ldo_ops, 3000000, 100000, 3600000),
520 MAX8998_LINEAR_REG(LDO9, &max8998_ldo_ops, 2800000, 100000, 3100000),
521 MAX8998_LINEAR_REG(LDO10, &max8998_ldo_ops, 950000, 50000, 1300000),
522 MAX8998_LINEAR_REG(LDO11, &max8998_ldo_ops, 1600000, 100000, 3600000),
523 MAX8998_LINEAR_REG(LDO12, &max8998_ldo_ops, 800000, 100000, 3300000),
524 MAX8998_LINEAR_REG(LDO13, &max8998_ldo_ops, 800000, 100000, 3300000),
525 MAX8998_LINEAR_REG(LDO14, &max8998_ldo_ops, 1200000, 100000, 3300000),
526 MAX8998_LINEAR_REG(LDO15, &max8998_ldo_ops, 1200000, 100000, 3300000),
527 MAX8998_LINEAR_REG(LDO16, &max8998_ldo_ops, 1600000, 100000, 3600000),
528 MAX8998_LINEAR_REG(LDO17, &max8998_ldo_ops, 1600000, 100000, 3600000),
529 MAX8998_LINEAR_REG(BUCK1, &max8998_buck_ops, 750000, 25000, 1525000),
530 MAX8998_LINEAR_REG(BUCK2, &max8998_buck_ops, 750000, 25000, 1525000),
531 MAX8998_LINEAR_REG(BUCK3, &max8998_buck_ops, 1600000, 100000, 3600000),
532 MAX8998_LINEAR_REG(BUCK4, &max8998_buck_ops, 800000, 100000, 2300000),
533 MAX8998_OTHERS_REG(EN32KHz-AP, MAX8998_EN32KHZ_AP),
534 MAX8998_OTHERS_REG(EN32KHz-CP, MAX8998_EN32KHZ_CP),
535 MAX8998_OTHERS_REG(ENVICHG, MAX8998_ENVICHG),
536 MAX8998_OTHERS_REG(ESAFEOUT1, MAX8998_ESAFEOUT1),
537 MAX8998_OTHERS_REG(ESAFEOUT2, MAX8998_ESAFEOUT2),
538 MAX8998_CURRENT_REG(CHARGER, &max8998_charger_ops,
539 charger_current_table, MAX8998_REG_CHGR1, 0x7),
540};
541
542static int max8998_pmic_dt_parse_dvs_gpio(struct max8998_dev *iodev,
543 struct max8998_platform_data *pdata,
544 struct device_node *pmic_np)
545{
546 int gpio;
547
548 gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck1-dvs-gpios", 0);
549 if (!gpio_is_valid(gpio)) {
550 dev_err(iodev->dev, "invalid buck1 gpio[0]: %d\n", gpio);
551 return -EINVAL;
552 }
553 pdata->buck1_set1 = gpio;
554
555 gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck1-dvs-gpios", 1);
556 if (!gpio_is_valid(gpio)) {
557 dev_err(iodev->dev, "invalid buck1 gpio[1]: %d\n", gpio);
558 return -EINVAL;
559 }
560 pdata->buck1_set2 = gpio;
561
562 gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck2-dvs-gpio", 0);
563 if (!gpio_is_valid(gpio)) {
564 dev_err(iodev->dev, "invalid buck 2 gpio: %d\n", gpio);
565 return -EINVAL;
566 }
567 pdata->buck2_set3 = gpio;
568
569 return 0;
570}
571
572static int max8998_pmic_dt_parse_pdata(struct max8998_dev *iodev,
573 struct max8998_platform_data *pdata)
574{
575 struct device_node *pmic_np = iodev->dev->of_node;
576 struct device_node *regulators_np, *reg_np;
577 struct max8998_regulator_data *rdata;
578 unsigned int i;
579 int ret;
580
581 regulators_np = of_get_child_by_name(pmic_np, "regulators");
582 if (!regulators_np) {
583 dev_err(iodev->dev, "could not find regulators sub-node\n");
584 return -EINVAL;
585 }
586
587 /* count the number of regulators to be supported in pmic */
588 pdata->num_regulators = of_get_child_count(regulators_np);
589
590 rdata = devm_kcalloc(iodev->dev,
591 pdata->num_regulators, sizeof(*rdata),
592 GFP_KERNEL);
593 if (!rdata) {
594 of_node_put(regulators_np);
595 return -ENOMEM;
596 }
597
598 pdata->regulators = rdata;
599 for (i = 0; i < ARRAY_SIZE(regulators); ++i) {
600 reg_np = of_get_child_by_name(regulators_np,
601 regulators[i].name);
602 if (!reg_np)
603 continue;
604
605 rdata->id = regulators[i].id;
606 rdata->initdata = of_get_regulator_init_data(iodev->dev,
607 reg_np,
608 ®ulators[i]);
609 rdata->reg_node = reg_np;
610 ++rdata;
611 }
612 pdata->num_regulators = rdata - pdata->regulators;
613
614 of_node_put(reg_np);
615 of_node_put(regulators_np);
616
617 ret = max8998_pmic_dt_parse_dvs_gpio(iodev, pdata, pmic_np);
618 if (ret)
619 return -EINVAL;
620
621 if (of_find_property(pmic_np, "max8998,pmic-buck-voltage-lock", NULL))
622 pdata->buck_voltage_lock = true;
623
624 ret = of_property_read_u32(pmic_np,
625 "max8998,pmic-buck1-default-dvs-idx",
626 &pdata->buck1_default_idx);
627 if (!ret && pdata->buck1_default_idx >= 4) {
628 pdata->buck1_default_idx = 0;
629 dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
630 }
631
632 ret = of_property_read_u32(pmic_np,
633 "max8998,pmic-buck2-default-dvs-idx",
634 &pdata->buck2_default_idx);
635 if (!ret && pdata->buck2_default_idx >= 2) {
636 pdata->buck2_default_idx = 0;
637 dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
638 }
639
640 ret = of_property_read_u32_array(pmic_np,
641 "max8998,pmic-buck1-dvs-voltage",
642 pdata->buck1_voltage,
643 ARRAY_SIZE(pdata->buck1_voltage));
644 if (ret) {
645 dev_err(iodev->dev, "buck1 voltages not specified\n");
646 return -EINVAL;
647 }
648
649 ret = of_property_read_u32_array(pmic_np,
650 "max8998,pmic-buck2-dvs-voltage",
651 pdata->buck2_voltage,
652 ARRAY_SIZE(pdata->buck2_voltage));
653 if (ret) {
654 dev_err(iodev->dev, "buck2 voltages not specified\n");
655 return -EINVAL;
656 }
657
658 return 0;
659}
660
661static int max8998_pmic_probe(struct platform_device *pdev)
662{
663 struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
664 struct max8998_platform_data *pdata = iodev->pdata;
665 struct regulator_config config = { };
666 struct regulator_dev *rdev;
667 struct max8998_data *max8998;
668 struct i2c_client *i2c;
669 int i, ret;
670 unsigned int v;
671
672 if (!pdata) {
673 dev_err(pdev->dev.parent, "No platform init data supplied\n");
674 return -ENODEV;
675 }
676
677 if (IS_ENABLED(CONFIG_OF) && iodev->dev->of_node) {
678 ret = max8998_pmic_dt_parse_pdata(iodev, pdata);
679 if (ret)
680 return ret;
681 }
682
683 max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_data),
684 GFP_KERNEL);
685 if (!max8998)
686 return -ENOMEM;
687
688 max8998->dev = &pdev->dev;
689 max8998->iodev = iodev;
690 max8998->num_regulators = pdata->num_regulators;
691 platform_set_drvdata(pdev, max8998);
692 i2c = max8998->iodev->i2c;
693
694 max8998->buck1_idx = pdata->buck1_default_idx;
695 max8998->buck2_idx = pdata->buck2_default_idx;
696
697 /* NOTE: */
698 /* For unused GPIO NOT marked as -1 (thereof equal to 0) WARN_ON */
699 /* will be displayed */
700
701 /* Check if MAX8998 voltage selection GPIOs are defined */
702 if (gpio_is_valid(pdata->buck1_set1) &&
703 gpio_is_valid(pdata->buck1_set2)) {
704 /* Check if SET1 is not equal to 0 */
705 if (!pdata->buck1_set1) {
706 dev_err(&pdev->dev,
707 "MAX8998 SET1 GPIO defined as 0 !\n");
708 WARN_ON(!pdata->buck1_set1);
709 return -EIO;
710 }
711 /* Check if SET2 is not equal to 0 */
712 if (!pdata->buck1_set2) {
713 dev_err(&pdev->dev,
714 "MAX8998 SET2 GPIO defined as 0 !\n");
715 WARN_ON(!pdata->buck1_set2);
716 return -EIO;
717 }
718
719 gpio_request(pdata->buck1_set1, "MAX8998 BUCK1_SET1");
720 gpio_direction_output(pdata->buck1_set1,
721 max8998->buck1_idx & 0x1);
722
723
724 gpio_request(pdata->buck1_set2, "MAX8998 BUCK1_SET2");
725 gpio_direction_output(pdata->buck1_set2,
726 (max8998->buck1_idx >> 1) & 0x1);
727
728 /* Set predefined values for BUCK1 registers */
729 for (v = 0; v < ARRAY_SIZE(pdata->buck1_voltage); ++v) {
730 int index = MAX8998_BUCK1 - MAX8998_LDO2;
731
732 i = 0;
733 while (regulators[index].min_uV +
734 regulators[index].uV_step * i
735 < pdata->buck1_voltage[v])
736 i++;
737
738 max8998->buck1_vol[v] = i;
739 ret = max8998_write_reg(i2c,
740 MAX8998_REG_BUCK1_VOLTAGE1 + v, i);
741 if (ret)
742 return ret;
743 }
744 }
745
746 if (gpio_is_valid(pdata->buck2_set3)) {
747 /* Check if SET3 is not equal to 0 */
748 if (!pdata->buck2_set3) {
749 dev_err(&pdev->dev,
750 "MAX8998 SET3 GPIO defined as 0 !\n");
751 WARN_ON(!pdata->buck2_set3);
752 return -EIO;
753 }
754 gpio_request(pdata->buck2_set3, "MAX8998 BUCK2_SET3");
755 gpio_direction_output(pdata->buck2_set3,
756 max8998->buck2_idx & 0x1);
757
758 /* Set predefined values for BUCK2 registers */
759 for (v = 0; v < ARRAY_SIZE(pdata->buck2_voltage); ++v) {
760 int index = MAX8998_BUCK2 - MAX8998_LDO2;
761
762 i = 0;
763 while (regulators[index].min_uV +
764 regulators[index].uV_step * i
765 < pdata->buck2_voltage[v])
766 i++;
767
768 max8998->buck2_vol[v] = i;
769 ret = max8998_write_reg(i2c,
770 MAX8998_REG_BUCK2_VOLTAGE1 + v, i);
771 if (ret)
772 return ret;
773 }
774 }
775
776 for (i = 0; i < pdata->num_regulators; i++) {
777 int index = pdata->regulators[i].id - MAX8998_LDO2;
778
779 config.dev = max8998->dev;
780 config.of_node = pdata->regulators[i].reg_node;
781 config.init_data = pdata->regulators[i].initdata;
782 config.driver_data = max8998;
783
784 rdev = devm_regulator_register(&pdev->dev, ®ulators[index],
785 &config);
786 if (IS_ERR(rdev)) {
787 ret = PTR_ERR(rdev);
788 dev_err(max8998->dev, "regulator %s init failed (%d)\n",
789 regulators[index].name, ret);
790 return ret;
791 }
792 }
793
794 return 0;
795}
796
797static const struct platform_device_id max8998_pmic_id[] = {
798 { "max8998-pmic", TYPE_MAX8998 },
799 { "lp3974-pmic", TYPE_LP3974 },
800 { }
801};
802MODULE_DEVICE_TABLE(platform, max8998_pmic_id);
803
804static struct platform_driver max8998_pmic_driver = {
805 .driver = {
806 .name = "max8998-pmic",
807 },
808 .probe = max8998_pmic_probe,
809 .id_table = max8998_pmic_id,
810};
811
812static int __init max8998_pmic_init(void)
813{
814 return platform_driver_register(&max8998_pmic_driver);
815}
816subsys_initcall(max8998_pmic_init);
817
818static void __exit max8998_pmic_cleanup(void)
819{
820 platform_driver_unregister(&max8998_pmic_driver);
821}
822module_exit(max8998_pmic_cleanup);
823
824MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
825MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
826MODULE_LICENSE("GPL");
1/*
2 * max8998.c - Voltage regulator driver for the Maxim 8998
3 *
4 * Copyright (C) 2009-2010 Samsung Electronics
5 * Kyungmin Park <kyungmin.park@samsung.com>
6 * Marek Szyprowski <m.szyprowski@samsung.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/i2c.h>
26#include <linux/err.h>
27#include <linux/gpio.h>
28#include <linux/slab.h>
29#include <linux/interrupt.h>
30#include <linux/mutex.h>
31#include <linux/platform_device.h>
32#include <linux/regulator/driver.h>
33#include <linux/mfd/max8998.h>
34#include <linux/mfd/max8998-private.h>
35
36struct max8998_data {
37 struct device *dev;
38 struct max8998_dev *iodev;
39 int num_regulators;
40 struct regulator_dev **rdev;
41 u8 buck1_vol[4]; /* voltages for selection */
42 u8 buck2_vol[2];
43 unsigned int buck1_idx; /* index to last changed voltage */
44 /* value in a set */
45 unsigned int buck2_idx;
46};
47
48struct voltage_map_desc {
49 int min;
50 int max;
51 int step;
52};
53
54/* Voltage maps */
55static const struct voltage_map_desc ldo23_voltage_map_desc = {
56 .min = 800, .step = 50, .max = 1300,
57};
58static const struct voltage_map_desc ldo456711_voltage_map_desc = {
59 .min = 1600, .step = 100, .max = 3600,
60};
61static const struct voltage_map_desc ldo8_voltage_map_desc = {
62 .min = 3000, .step = 100, .max = 3600,
63};
64static const struct voltage_map_desc ldo9_voltage_map_desc = {
65 .min = 2800, .step = 100, .max = 3100,
66};
67static const struct voltage_map_desc ldo10_voltage_map_desc = {
68 .min = 950, .step = 50, .max = 1300,
69};
70static const struct voltage_map_desc ldo1213_voltage_map_desc = {
71 .min = 800, .step = 100, .max = 3300,
72};
73static const struct voltage_map_desc ldo1415_voltage_map_desc = {
74 .min = 1200, .step = 100, .max = 3300,
75};
76static const struct voltage_map_desc ldo1617_voltage_map_desc = {
77 .min = 1600, .step = 100, .max = 3600,
78};
79static const struct voltage_map_desc buck12_voltage_map_desc = {
80 .min = 750, .step = 25, .max = 1525,
81};
82static const struct voltage_map_desc buck3_voltage_map_desc = {
83 .min = 1600, .step = 100, .max = 3600,
84};
85static const struct voltage_map_desc buck4_voltage_map_desc = {
86 .min = 800, .step = 100, .max = 2300,
87};
88
89static const struct voltage_map_desc *ldo_voltage_map[] = {
90 NULL,
91 NULL,
92 &ldo23_voltage_map_desc, /* LDO2 */
93 &ldo23_voltage_map_desc, /* LDO3 */
94 &ldo456711_voltage_map_desc, /* LDO4 */
95 &ldo456711_voltage_map_desc, /* LDO5 */
96 &ldo456711_voltage_map_desc, /* LDO6 */
97 &ldo456711_voltage_map_desc, /* LDO7 */
98 &ldo8_voltage_map_desc, /* LDO8 */
99 &ldo9_voltage_map_desc, /* LDO9 */
100 &ldo10_voltage_map_desc, /* LDO10 */
101 &ldo456711_voltage_map_desc, /* LDO11 */
102 &ldo1213_voltage_map_desc, /* LDO12 */
103 &ldo1213_voltage_map_desc, /* LDO13 */
104 &ldo1415_voltage_map_desc, /* LDO14 */
105 &ldo1415_voltage_map_desc, /* LDO15 */
106 &ldo1617_voltage_map_desc, /* LDO16 */
107 &ldo1617_voltage_map_desc, /* LDO17 */
108 &buck12_voltage_map_desc, /* BUCK1 */
109 &buck12_voltage_map_desc, /* BUCK2 */
110 &buck3_voltage_map_desc, /* BUCK3 */
111 &buck4_voltage_map_desc, /* BUCK4 */
112};
113
114static int max8998_list_voltage(struct regulator_dev *rdev,
115 unsigned int selector)
116{
117 const struct voltage_map_desc *desc;
118 int ldo = rdev_get_id(rdev);
119 int val;
120
121 if (ldo >= ARRAY_SIZE(ldo_voltage_map))
122 return -EINVAL;
123
124 desc = ldo_voltage_map[ldo];
125 if (desc == NULL)
126 return -EINVAL;
127
128 val = desc->min + desc->step * selector;
129 if (val > desc->max)
130 return -EINVAL;
131
132 return val * 1000;
133}
134
135static int max8998_get_enable_register(struct regulator_dev *rdev,
136 int *reg, int *shift)
137{
138 int ldo = rdev_get_id(rdev);
139
140 switch (ldo) {
141 case MAX8998_LDO2 ... MAX8998_LDO5:
142 *reg = MAX8998_REG_ONOFF1;
143 *shift = 3 - (ldo - MAX8998_LDO2);
144 break;
145 case MAX8998_LDO6 ... MAX8998_LDO13:
146 *reg = MAX8998_REG_ONOFF2;
147 *shift = 7 - (ldo - MAX8998_LDO6);
148 break;
149 case MAX8998_LDO14 ... MAX8998_LDO17:
150 *reg = MAX8998_REG_ONOFF3;
151 *shift = 7 - (ldo - MAX8998_LDO14);
152 break;
153 case MAX8998_BUCK1 ... MAX8998_BUCK4:
154 *reg = MAX8998_REG_ONOFF1;
155 *shift = 7 - (ldo - MAX8998_BUCK1);
156 break;
157 case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
158 *reg = MAX8998_REG_ONOFF4;
159 *shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
160 break;
161 case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
162 *reg = MAX8998_REG_CHGR2;
163 *shift = 7 - (ldo - MAX8998_ESAFEOUT1);
164 break;
165 default:
166 return -EINVAL;
167 }
168
169 return 0;
170}
171
172static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
173{
174 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
175 struct i2c_client *i2c = max8998->iodev->i2c;
176 int ret, reg, shift = 8;
177 u8 val;
178
179 ret = max8998_get_enable_register(rdev, ®, &shift);
180 if (ret)
181 return ret;
182
183 ret = max8998_read_reg(i2c, reg, &val);
184 if (ret)
185 return ret;
186
187 return val & (1 << shift);
188}
189
190static int max8998_ldo_enable(struct regulator_dev *rdev)
191{
192 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
193 struct i2c_client *i2c = max8998->iodev->i2c;
194 int reg, shift = 8, ret;
195
196 ret = max8998_get_enable_register(rdev, ®, &shift);
197 if (ret)
198 return ret;
199
200 return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
201}
202
203static int max8998_ldo_disable(struct regulator_dev *rdev)
204{
205 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
206 struct i2c_client *i2c = max8998->iodev->i2c;
207 int reg, shift = 8, ret;
208
209 ret = max8998_get_enable_register(rdev, ®, &shift);
210 if (ret)
211 return ret;
212
213 return max8998_update_reg(i2c, reg, 0, 1<<shift);
214}
215
216static int max8998_get_voltage_register(struct regulator_dev *rdev,
217 int *_reg, int *_shift, int *_mask)
218{
219 int ldo = rdev_get_id(rdev);
220 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
221 int reg, shift = 0, mask = 0xff;
222
223 switch (ldo) {
224 case MAX8998_LDO2 ... MAX8998_LDO3:
225 reg = MAX8998_REG_LDO2_LDO3;
226 mask = 0xf;
227 if (ldo == MAX8998_LDO2)
228 shift = 4;
229 else
230 shift = 0;
231 break;
232 case MAX8998_LDO4 ... MAX8998_LDO7:
233 reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
234 break;
235 case MAX8998_LDO8 ... MAX8998_LDO9:
236 reg = MAX8998_REG_LDO8_LDO9;
237 mask = 0xf;
238 if (ldo == MAX8998_LDO8)
239 shift = 4;
240 else
241 shift = 0;
242 break;
243 case MAX8998_LDO10 ... MAX8998_LDO11:
244 reg = MAX8998_REG_LDO10_LDO11;
245 if (ldo == MAX8998_LDO10) {
246 shift = 5;
247 mask = 0x7;
248 } else {
249 shift = 0;
250 mask = 0x1f;
251 }
252 break;
253 case MAX8998_LDO12 ... MAX8998_LDO17:
254 reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
255 break;
256 case MAX8998_BUCK1:
257 reg = MAX8998_REG_BUCK1_VOLTAGE1 + max8998->buck1_idx;
258 break;
259 case MAX8998_BUCK2:
260 reg = MAX8998_REG_BUCK2_VOLTAGE1 + max8998->buck2_idx;
261 break;
262 case MAX8998_BUCK3:
263 reg = MAX8998_REG_BUCK3;
264 break;
265 case MAX8998_BUCK4:
266 reg = MAX8998_REG_BUCK4;
267 break;
268 default:
269 return -EINVAL;
270 }
271
272 *_reg = reg;
273 *_shift = shift;
274 *_mask = mask;
275
276 return 0;
277}
278
279static int max8998_get_voltage_sel(struct regulator_dev *rdev)
280{
281 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
282 struct i2c_client *i2c = max8998->iodev->i2c;
283 int reg, shift = 0, mask, ret;
284 u8 val;
285
286 ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
287 if (ret)
288 return ret;
289
290 ret = max8998_read_reg(i2c, reg, &val);
291 if (ret)
292 return ret;
293
294 val >>= shift;
295 val &= mask;
296
297 return val;
298}
299
300static int max8998_set_voltage_ldo(struct regulator_dev *rdev,
301 int min_uV, int max_uV, unsigned *selector)
302{
303 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
304 struct i2c_client *i2c = max8998->iodev->i2c;
305 int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
306 const struct voltage_map_desc *desc;
307 int ldo = rdev_get_id(rdev);
308 int reg, shift = 0, mask, ret, i;
309
310 if (ldo >= ARRAY_SIZE(ldo_voltage_map))
311 return -EINVAL;
312
313 desc = ldo_voltage_map[ldo];
314 if (desc == NULL)
315 return -EINVAL;
316
317 if (max_vol < desc->min || min_vol > desc->max)
318 return -EINVAL;
319
320 if (min_vol < desc->min)
321 min_vol = desc->min;
322
323 i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
324
325 if (desc->min + desc->step*i > max_vol)
326 return -EINVAL;
327
328 *selector = i;
329
330 ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
331 if (ret)
332 return ret;
333
334 ret = max8998_update_reg(i2c, reg, i<<shift, mask<<shift);
335
336 return ret;
337}
338
339static inline void buck1_gpio_set(int gpio1, int gpio2, int v)
340{
341 gpio_set_value(gpio1, v & 0x1);
342 gpio_set_value(gpio2, (v >> 1) & 0x1);
343}
344
345static inline void buck2_gpio_set(int gpio, int v)
346{
347 gpio_set_value(gpio, v & 0x1);
348}
349
350static int max8998_set_voltage_buck(struct regulator_dev *rdev,
351 int min_uV, int max_uV, unsigned *selector)
352{
353 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
354 struct max8998_platform_data *pdata =
355 dev_get_platdata(max8998->iodev->dev);
356 struct i2c_client *i2c = max8998->iodev->i2c;
357 int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
358 const struct voltage_map_desc *desc;
359 int buck = rdev_get_id(rdev);
360 int reg, shift = 0, mask, ret;
361 int i, j, previous_sel;
362 static u8 buck1_last_val;
363
364 if (buck >= ARRAY_SIZE(ldo_voltage_map))
365 return -EINVAL;
366
367 desc = ldo_voltage_map[buck];
368
369 if (desc == NULL)
370 return -EINVAL;
371
372 if (max_vol < desc->min || min_vol > desc->max)
373 return -EINVAL;
374
375 if (min_vol < desc->min)
376 min_vol = desc->min;
377
378 i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
379
380 if (desc->min + desc->step*i > max_vol)
381 return -EINVAL;
382
383 *selector = i;
384
385 ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
386 if (ret)
387 return ret;
388
389 previous_sel = max8998_get_voltage_sel(rdev);
390
391 /* Check if voltage needs to be changed */
392 /* if previous_voltage equal new voltage, return */
393 if (previous_sel == i) {
394 dev_dbg(max8998->dev, "No voltage change, old:%d, new:%d\n",
395 max8998_list_voltage(rdev, previous_sel),
396 max8998_list_voltage(rdev, i));
397 return ret;
398 }
399
400 switch (buck) {
401 case MAX8998_BUCK1:
402 dev_dbg(max8998->dev,
403 "BUCK1, i:%d, buck1_vol1:%d, buck1_vol2:%d\n"
404 "buck1_vol3:%d, buck1_vol4:%d\n",
405 i, max8998->buck1_vol[0], max8998->buck1_vol[1],
406 max8998->buck1_vol[2], max8998->buck1_vol[3]);
407
408 if (gpio_is_valid(pdata->buck1_set1) &&
409 gpio_is_valid(pdata->buck1_set2)) {
410
411 /* check if requested voltage */
412 /* value is already defined */
413 for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
414 if (max8998->buck1_vol[j] == i) {
415 max8998->buck1_idx = j;
416 buck1_gpio_set(pdata->buck1_set1,
417 pdata->buck1_set2, j);
418 goto buck1_exit;
419 }
420 }
421
422 if (pdata->buck_voltage_lock)
423 return -EINVAL;
424
425 /* no predefine regulator found */
426 max8998->buck1_idx = (buck1_last_val % 2) + 2;
427 dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
428 max8998->buck1_idx);
429 max8998->buck1_vol[max8998->buck1_idx] = i;
430 ret = max8998_get_voltage_register(rdev, ®,
431 &shift,
432 &mask);
433 ret = max8998_write_reg(i2c, reg, i);
434 buck1_gpio_set(pdata->buck1_set1,
435 pdata->buck1_set2, max8998->buck1_idx);
436 buck1_last_val++;
437buck1_exit:
438 dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
439 i2c->name, gpio_get_value(pdata->buck1_set1),
440 gpio_get_value(pdata->buck1_set2));
441 break;
442 } else {
443 ret = max8998_write_reg(i2c, reg, i);
444 }
445 break;
446
447 case MAX8998_BUCK2:
448 dev_dbg(max8998->dev,
449 "BUCK2, i:%d buck2_vol1:%d, buck2_vol2:%d\n"
450 , i, max8998->buck2_vol[0], max8998->buck2_vol[1]);
451 if (gpio_is_valid(pdata->buck2_set3)) {
452
453 /* check if requested voltage */
454 /* value is already defined */
455 for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
456 if (max8998->buck2_vol[j] == i) {
457 max8998->buck2_idx = j;
458 buck2_gpio_set(pdata->buck2_set3, j);
459 goto buck2_exit;
460 }
461 }
462
463 if (pdata->buck_voltage_lock)
464 return -EINVAL;
465
466 max8998_get_voltage_register(rdev,
467 ®, &shift, &mask);
468 ret = max8998_write_reg(i2c, reg, i);
469 max8998->buck2_vol[max8998->buck2_idx] = i;
470 buck2_gpio_set(pdata->buck2_set3, max8998->buck2_idx);
471buck2_exit:
472 dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
473 gpio_get_value(pdata->buck2_set3));
474 } else {
475 ret = max8998_write_reg(i2c, reg, i);
476 }
477 break;
478
479 case MAX8998_BUCK3:
480 case MAX8998_BUCK4:
481 ret = max8998_update_reg(i2c, reg, i<<shift, mask<<shift);
482 break;
483 }
484
485 return ret;
486}
487
488static int max8998_set_voltage_buck_time_sel(struct regulator_dev *rdev,
489 unsigned int old_selector,
490 unsigned int new_selector)
491{
492 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
493 struct i2c_client *i2c = max8998->iodev->i2c;
494 const struct voltage_map_desc *desc;
495 int buck = rdev_get_id(rdev);
496 u8 val = 0;
497 int difference, ret;
498
499 if (buck < MAX8998_BUCK1 || buck > MAX8998_BUCK4)
500 return -EINVAL;
501
502 desc = ldo_voltage_map[buck];
503
504 /* Voltage stabilization */
505 ret = max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
506 if (ret)
507 return ret;
508
509 /* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
510 /* MAX8998 has ENRAMP bit implemented, so test it*/
511 if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
512 return 0;
513
514 difference = (new_selector - old_selector) * desc->step;
515 if (difference > 0)
516 return difference / ((val & 0x0f) + 1);
517
518 return 0;
519}
520
521static struct regulator_ops max8998_ldo_ops = {
522 .list_voltage = max8998_list_voltage,
523 .is_enabled = max8998_ldo_is_enabled,
524 .enable = max8998_ldo_enable,
525 .disable = max8998_ldo_disable,
526 .get_voltage_sel = max8998_get_voltage_sel,
527 .set_voltage = max8998_set_voltage_ldo,
528 .set_suspend_enable = max8998_ldo_enable,
529 .set_suspend_disable = max8998_ldo_disable,
530};
531
532static struct regulator_ops max8998_buck_ops = {
533 .list_voltage = max8998_list_voltage,
534 .is_enabled = max8998_ldo_is_enabled,
535 .enable = max8998_ldo_enable,
536 .disable = max8998_ldo_disable,
537 .get_voltage_sel = max8998_get_voltage_sel,
538 .set_voltage = max8998_set_voltage_buck,
539 .set_voltage_time_sel = max8998_set_voltage_buck_time_sel,
540 .set_suspend_enable = max8998_ldo_enable,
541 .set_suspend_disable = max8998_ldo_disable,
542};
543
544static struct regulator_ops max8998_others_ops = {
545 .is_enabled = max8998_ldo_is_enabled,
546 .enable = max8998_ldo_enable,
547 .disable = max8998_ldo_disable,
548 .set_suspend_enable = max8998_ldo_enable,
549 .set_suspend_disable = max8998_ldo_disable,
550};
551
552static struct regulator_desc regulators[] = {
553 {
554 .name = "LDO2",
555 .id = MAX8998_LDO2,
556 .ops = &max8998_ldo_ops,
557 .type = REGULATOR_VOLTAGE,
558 .owner = THIS_MODULE,
559 }, {
560 .name = "LDO3",
561 .id = MAX8998_LDO3,
562 .ops = &max8998_ldo_ops,
563 .type = REGULATOR_VOLTAGE,
564 .owner = THIS_MODULE,
565 }, {
566 .name = "LDO4",
567 .id = MAX8998_LDO4,
568 .ops = &max8998_ldo_ops,
569 .type = REGULATOR_VOLTAGE,
570 .owner = THIS_MODULE,
571 }, {
572 .name = "LDO5",
573 .id = MAX8998_LDO5,
574 .ops = &max8998_ldo_ops,
575 .type = REGULATOR_VOLTAGE,
576 .owner = THIS_MODULE,
577 }, {
578 .name = "LDO6",
579 .id = MAX8998_LDO6,
580 .ops = &max8998_ldo_ops,
581 .type = REGULATOR_VOLTAGE,
582 .owner = THIS_MODULE,
583 }, {
584 .name = "LDO7",
585 .id = MAX8998_LDO7,
586 .ops = &max8998_ldo_ops,
587 .type = REGULATOR_VOLTAGE,
588 .owner = THIS_MODULE,
589 }, {
590 .name = "LDO8",
591 .id = MAX8998_LDO8,
592 .ops = &max8998_ldo_ops,
593 .type = REGULATOR_VOLTAGE,
594 .owner = THIS_MODULE,
595 }, {
596 .name = "LDO9",
597 .id = MAX8998_LDO9,
598 .ops = &max8998_ldo_ops,
599 .type = REGULATOR_VOLTAGE,
600 .owner = THIS_MODULE,
601 }, {
602 .name = "LDO10",
603 .id = MAX8998_LDO10,
604 .ops = &max8998_ldo_ops,
605 .type = REGULATOR_VOLTAGE,
606 .owner = THIS_MODULE,
607 }, {
608 .name = "LDO11",
609 .id = MAX8998_LDO11,
610 .ops = &max8998_ldo_ops,
611 .type = REGULATOR_VOLTAGE,
612 .owner = THIS_MODULE,
613 }, {
614 .name = "LDO12",
615 .id = MAX8998_LDO12,
616 .ops = &max8998_ldo_ops,
617 .type = REGULATOR_VOLTAGE,
618 .owner = THIS_MODULE,
619 }, {
620 .name = "LDO13",
621 .id = MAX8998_LDO13,
622 .ops = &max8998_ldo_ops,
623 .type = REGULATOR_VOLTAGE,
624 .owner = THIS_MODULE,
625 }, {
626 .name = "LDO14",
627 .id = MAX8998_LDO14,
628 .ops = &max8998_ldo_ops,
629 .type = REGULATOR_VOLTAGE,
630 .owner = THIS_MODULE,
631 }, {
632 .name = "LDO15",
633 .id = MAX8998_LDO15,
634 .ops = &max8998_ldo_ops,
635 .type = REGULATOR_VOLTAGE,
636 .owner = THIS_MODULE,
637 }, {
638 .name = "LDO16",
639 .id = MAX8998_LDO16,
640 .ops = &max8998_ldo_ops,
641 .type = REGULATOR_VOLTAGE,
642 .owner = THIS_MODULE,
643 }, {
644 .name = "LDO17",
645 .id = MAX8998_LDO17,
646 .ops = &max8998_ldo_ops,
647 .type = REGULATOR_VOLTAGE,
648 .owner = THIS_MODULE,
649 }, {
650 .name = "BUCK1",
651 .id = MAX8998_BUCK1,
652 .ops = &max8998_buck_ops,
653 .type = REGULATOR_VOLTAGE,
654 .owner = THIS_MODULE,
655 }, {
656 .name = "BUCK2",
657 .id = MAX8998_BUCK2,
658 .ops = &max8998_buck_ops,
659 .type = REGULATOR_VOLTAGE,
660 .owner = THIS_MODULE,
661 }, {
662 .name = "BUCK3",
663 .id = MAX8998_BUCK3,
664 .ops = &max8998_buck_ops,
665 .type = REGULATOR_VOLTAGE,
666 .owner = THIS_MODULE,
667 }, {
668 .name = "BUCK4",
669 .id = MAX8998_BUCK4,
670 .ops = &max8998_buck_ops,
671 .type = REGULATOR_VOLTAGE,
672 .owner = THIS_MODULE,
673 }, {
674 .name = "EN32KHz AP",
675 .id = MAX8998_EN32KHZ_AP,
676 .ops = &max8998_others_ops,
677 .type = REGULATOR_VOLTAGE,
678 .owner = THIS_MODULE,
679 }, {
680 .name = "EN32KHz CP",
681 .id = MAX8998_EN32KHZ_CP,
682 .ops = &max8998_others_ops,
683 .type = REGULATOR_VOLTAGE,
684 .owner = THIS_MODULE,
685 }, {
686 .name = "ENVICHG",
687 .id = MAX8998_ENVICHG,
688 .ops = &max8998_others_ops,
689 .type = REGULATOR_VOLTAGE,
690 .owner = THIS_MODULE,
691 }, {
692 .name = "ESAFEOUT1",
693 .id = MAX8998_ESAFEOUT1,
694 .ops = &max8998_others_ops,
695 .type = REGULATOR_VOLTAGE,
696 .owner = THIS_MODULE,
697 }, {
698 .name = "ESAFEOUT2",
699 .id = MAX8998_ESAFEOUT2,
700 .ops = &max8998_others_ops,
701 .type = REGULATOR_VOLTAGE,
702 .owner = THIS_MODULE,
703 }
704};
705
706static __devinit int max8998_pmic_probe(struct platform_device *pdev)
707{
708 struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
709 struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
710 struct regulator_config config = { };
711 struct regulator_dev **rdev;
712 struct max8998_data *max8998;
713 struct i2c_client *i2c;
714 int i, ret, size;
715
716 if (!pdata) {
717 dev_err(pdev->dev.parent, "No platform init data supplied\n");
718 return -ENODEV;
719 }
720
721 max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_data),
722 GFP_KERNEL);
723 if (!max8998)
724 return -ENOMEM;
725
726 size = sizeof(struct regulator_dev *) * pdata->num_regulators;
727 max8998->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
728 if (!max8998->rdev)
729 return -ENOMEM;
730
731 rdev = max8998->rdev;
732 max8998->dev = &pdev->dev;
733 max8998->iodev = iodev;
734 max8998->num_regulators = pdata->num_regulators;
735 platform_set_drvdata(pdev, max8998);
736 i2c = max8998->iodev->i2c;
737
738 max8998->buck1_idx = pdata->buck1_default_idx;
739 max8998->buck2_idx = pdata->buck2_default_idx;
740
741 /* NOTE: */
742 /* For unused GPIO NOT marked as -1 (thereof equal to 0) WARN_ON */
743 /* will be displayed */
744
745 /* Check if MAX8998 voltage selection GPIOs are defined */
746 if (gpio_is_valid(pdata->buck1_set1) &&
747 gpio_is_valid(pdata->buck1_set2)) {
748 /* Check if SET1 is not equal to 0 */
749 if (!pdata->buck1_set1) {
750 printk(KERN_ERR "MAX8998 SET1 GPIO defined as 0 !\n");
751 WARN_ON(!pdata->buck1_set1);
752 ret = -EIO;
753 goto err_out;
754 }
755 /* Check if SET2 is not equal to 0 */
756 if (!pdata->buck1_set2) {
757 printk(KERN_ERR "MAX8998 SET2 GPIO defined as 0 !\n");
758 WARN_ON(!pdata->buck1_set2);
759 ret = -EIO;
760 goto err_out;
761 }
762
763 gpio_request(pdata->buck1_set1, "MAX8998 BUCK1_SET1");
764 gpio_direction_output(pdata->buck1_set1,
765 max8998->buck1_idx & 0x1);
766
767
768 gpio_request(pdata->buck1_set2, "MAX8998 BUCK1_SET2");
769 gpio_direction_output(pdata->buck1_set2,
770 (max8998->buck1_idx >> 1) & 0x1);
771 /* Set predefined value for BUCK1 register 1 */
772 i = 0;
773 while (buck12_voltage_map_desc.min +
774 buck12_voltage_map_desc.step*i
775 < (pdata->buck1_voltage1 / 1000))
776 i++;
777 max8998->buck1_vol[0] = i;
778 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE1, i);
779 if (ret)
780 goto err_out;
781
782 /* Set predefined value for BUCK1 register 2 */
783 i = 0;
784 while (buck12_voltage_map_desc.min +
785 buck12_voltage_map_desc.step*i
786 < (pdata->buck1_voltage2 / 1000))
787 i++;
788
789 max8998->buck1_vol[1] = i;
790 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE2, i);
791 if (ret)
792 goto err_out;
793
794 /* Set predefined value for BUCK1 register 3 */
795 i = 0;
796 while (buck12_voltage_map_desc.min +
797 buck12_voltage_map_desc.step*i
798 < (pdata->buck1_voltage3 / 1000))
799 i++;
800
801 max8998->buck1_vol[2] = i;
802 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE3, i);
803 if (ret)
804 goto err_out;
805
806 /* Set predefined value for BUCK1 register 4 */
807 i = 0;
808 while (buck12_voltage_map_desc.min +
809 buck12_voltage_map_desc.step*i
810 < (pdata->buck1_voltage4 / 1000))
811 i++;
812
813 max8998->buck1_vol[3] = i;
814 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE4, i);
815 if (ret)
816 goto err_out;
817
818 }
819
820 if (gpio_is_valid(pdata->buck2_set3)) {
821 /* Check if SET3 is not equal to 0 */
822 if (!pdata->buck2_set3) {
823 printk(KERN_ERR "MAX8998 SET3 GPIO defined as 0 !\n");
824 WARN_ON(!pdata->buck2_set3);
825 ret = -EIO;
826 goto err_out;
827 }
828 gpio_request(pdata->buck2_set3, "MAX8998 BUCK2_SET3");
829 gpio_direction_output(pdata->buck2_set3,
830 max8998->buck2_idx & 0x1);
831
832 /* BUCK2 register 1 */
833 i = 0;
834 while (buck12_voltage_map_desc.min +
835 buck12_voltage_map_desc.step*i
836 < (pdata->buck2_voltage1 / 1000))
837 i++;
838 max8998->buck2_vol[0] = i;
839 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK2_VOLTAGE1, i);
840 if (ret)
841 goto err_out;
842
843 /* BUCK2 register 2 */
844 i = 0;
845 while (buck12_voltage_map_desc.min +
846 buck12_voltage_map_desc.step*i
847 < (pdata->buck2_voltage2 / 1000))
848 i++;
849 max8998->buck2_vol[1] = i;
850 ret = max8998_write_reg(i2c, MAX8998_REG_BUCK2_VOLTAGE2, i);
851 if (ret)
852 goto err_out;
853 }
854
855 for (i = 0; i < pdata->num_regulators; i++) {
856 const struct voltage_map_desc *desc;
857 int id = pdata->regulators[i].id;
858 int index = id - MAX8998_LDO2;
859
860 desc = ldo_voltage_map[id];
861 if (desc && regulators[index].ops != &max8998_others_ops) {
862 int count = (desc->max - desc->min) / desc->step + 1;
863 regulators[index].n_voltages = count;
864 }
865
866 config.dev = max8998->dev;
867 config.init_data = pdata->regulators[i].initdata;
868 config.driver_data = max8998;
869
870 rdev[i] = regulator_register(®ulators[index], &config);
871 if (IS_ERR(rdev[i])) {
872 ret = PTR_ERR(rdev[i]);
873 dev_err(max8998->dev, "regulator init failed\n");
874 rdev[i] = NULL;
875 goto err;
876 }
877 }
878
879
880 return 0;
881err:
882 while (--i >= 0)
883 regulator_unregister(rdev[i]);
884err_out:
885 return ret;
886}
887
888static int __devexit max8998_pmic_remove(struct platform_device *pdev)
889{
890 struct max8998_data *max8998 = platform_get_drvdata(pdev);
891 struct regulator_dev **rdev = max8998->rdev;
892 int i;
893
894 for (i = 0; i < max8998->num_regulators; i++)
895 regulator_unregister(rdev[i]);
896 return 0;
897}
898
899static const struct platform_device_id max8998_pmic_id[] = {
900 { "max8998-pmic", TYPE_MAX8998 },
901 { "lp3974-pmic", TYPE_LP3974 },
902 { }
903};
904MODULE_DEVICE_TABLE(platform, max8998_pmic_id);
905
906static struct platform_driver max8998_pmic_driver = {
907 .driver = {
908 .name = "max8998-pmic",
909 .owner = THIS_MODULE,
910 },
911 .probe = max8998_pmic_probe,
912 .remove = __devexit_p(max8998_pmic_remove),
913 .id_table = max8998_pmic_id,
914};
915
916static int __init max8998_pmic_init(void)
917{
918 return platform_driver_register(&max8998_pmic_driver);
919}
920subsys_initcall(max8998_pmic_init);
921
922static void __exit max8998_pmic_cleanup(void)
923{
924 platform_driver_unregister(&max8998_pmic_driver);
925}
926module_exit(max8998_pmic_cleanup);
927
928MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
929MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
930MODULE_LICENSE("GPL");