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dm writecache: add cond_resched to loop in persistent_memory_claim()
[linux/fpc-iii.git] / drivers / regulator / max8998.c
blob60599c3bb845cc6d3a2b60ff3e0b0e44d745d027
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
25 struct 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
36 static int max8998_get_enable_register(struct regulator_dev *rdev,
37 int *reg, int *shift)
38 {
39 int ldo = rdev_get_id(rdev);
40
41 switch (ldo) {
42 case MAX8998_LDO2 ... MAX8998_LDO5:
43 *reg = MAX8998_REG_ONOFF1;
44 *shift = 3 - (ldo - MAX8998_LDO2);
45 break;
46 case MAX8998_LDO6 ... MAX8998_LDO13:
47 *reg = MAX8998_REG_ONOFF2;
48 *shift = 7 - (ldo - MAX8998_LDO6);
49 break;
50 case MAX8998_LDO14 ... MAX8998_LDO17:
51 *reg = MAX8998_REG_ONOFF3;
52 *shift = 7 - (ldo - MAX8998_LDO14);
53 break;
54 case MAX8998_BUCK1 ... MAX8998_BUCK4:
55 *reg = MAX8998_REG_ONOFF1;
56 *shift = 7 - (ldo - MAX8998_BUCK1);
57 break;
58 case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
59 *reg = MAX8998_REG_ONOFF4;
60 *shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
61 break;
62 case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
63 *reg = MAX8998_REG_CHGR2;
64 *shift = 7 - (ldo - MAX8998_ESAFEOUT1);
65 break;
66 default:
67 return -EINVAL;
68 }
69
70 return 0;
71 }
72
73 static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
74 {
75 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
76 struct i2c_client *i2c = max8998->iodev->i2c;
77 int ret, reg, shift = 8;
78 u8 val;
79
80 ret = max8998_get_enable_register(rdev, &reg, &shift);
81 if (ret)
82 return ret;
83
84 ret = max8998_read_reg(i2c, reg, &val);
85 if (ret)
86 return ret;
87
88 return val & (1 << shift);
89 }
90
91 static int max8998_ldo_enable(struct regulator_dev *rdev)
92 {
93 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
94 struct i2c_client *i2c = max8998->iodev->i2c;
95 int reg, shift = 8, ret;
96
97 ret = max8998_get_enable_register(rdev, &reg, &shift);
98 if (ret)
99 return ret;
100
101 return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
102 }
103
104 static int max8998_ldo_disable(struct regulator_dev *rdev)
105 {
106 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
107 struct i2c_client *i2c = max8998->iodev->i2c;
108 int reg, shift = 8, ret;
109
110 ret = max8998_get_enable_register(rdev, &reg, &shift);
111 if (ret)
112 return ret;
113
114 return max8998_update_reg(i2c, reg, 0, 1<<shift);
115 }
116
117 static int max8998_get_voltage_register(struct regulator_dev *rdev,
118 int *_reg, int *_shift, int *_mask)
119 {
120 int ldo = rdev_get_id(rdev);
121 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
122 int reg, shift = 0, mask = 0xff;
123
124 switch (ldo) {
125 case MAX8998_LDO2 ... MAX8998_LDO3:
126 reg = MAX8998_REG_LDO2_LDO3;
127 mask = 0xf;
128 if (ldo == MAX8998_LDO2)
129 shift = 4;
130 else
131 shift = 0;
132 break;
133 case MAX8998_LDO4 ... MAX8998_LDO7:
134 reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
135 break;
136 case MAX8998_LDO8 ... MAX8998_LDO9:
137 reg = MAX8998_REG_LDO8_LDO9;
138 mask = 0xf;
139 if (ldo == MAX8998_LDO8)
140 shift = 4;
141 else
142 shift = 0;
143 break;
144 case MAX8998_LDO10 ... MAX8998_LDO11:
145 reg = MAX8998_REG_LDO10_LDO11;
146 if (ldo == MAX8998_LDO10) {
147 shift = 5;
148 mask = 0x7;
149 } else {
150 shift = 0;
151 mask = 0x1f;
152 }
153 break;
154 case MAX8998_LDO12 ... MAX8998_LDO17:
155 reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
156 break;
157 case MAX8998_BUCK1:
158 reg = MAX8998_REG_BUCK1_VOLTAGE1 + max8998->buck1_idx;
159 break;
160 case MAX8998_BUCK2:
161 reg = MAX8998_REG_BUCK2_VOLTAGE1 + max8998->buck2_idx;
162 break;
163 case MAX8998_BUCK3:
164 reg = MAX8998_REG_BUCK3;
165 break;
166 case MAX8998_BUCK4:
167 reg = MAX8998_REG_BUCK4;
168 break;
169 default:
170 return -EINVAL;
171 }
172
173 *_reg = reg;
174 *_shift = shift;
175 *_mask = mask;
176
177 return 0;
178 }
179
180 static int max8998_get_voltage_sel(struct regulator_dev *rdev)
181 {
182 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
183 struct i2c_client *i2c = max8998->iodev->i2c;
184 int reg, shift = 0, mask, ret;
185 u8 val;
186
187 ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
188 if (ret)
189 return ret;
190
191 ret = max8998_read_reg(i2c, reg, &val);
192 if (ret)
193 return ret;
194
195 val >>= shift;
196 val &= mask;
197
198 return val;
199 }
200
201 static int max8998_set_voltage_ldo_sel(struct regulator_dev *rdev,
202 unsigned selector)
203 {
204 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
205 struct i2c_client *i2c = max8998->iodev->i2c;
206 int reg, shift = 0, mask, ret;
207
208 ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
209 if (ret)
210 return ret;
211
212 ret = max8998_update_reg(i2c, reg, selector<<shift, mask<<shift);
213
214 return ret;
215 }
216
217 static inline void buck1_gpio_set(int gpio1, int gpio2, int v)
218 {
219 gpio_set_value(gpio1, v & 0x1);
220 gpio_set_value(gpio2, (v >> 1) & 0x1);
221 }
222
223 static inline void buck2_gpio_set(int gpio, int v)
224 {
225 gpio_set_value(gpio, v & 0x1);
226 }
227
228 static int max8998_set_voltage_buck_sel(struct regulator_dev *rdev,
229 unsigned selector)
230 {
231 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
232 struct max8998_platform_data *pdata = max8998->iodev->pdata;
233 struct i2c_client *i2c = max8998->iodev->i2c;
234 int buck = rdev_get_id(rdev);
235 int reg, shift = 0, mask, ret, j;
236 static u8 buck1_last_val;
237
238 ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
239 if (ret)
240 return ret;
241
242 switch (buck) {
243 case MAX8998_BUCK1:
244 dev_dbg(max8998->dev,
245 "BUCK1, selector:%d, buck1_vol1:%d, buck1_vol2:%d\n"
246 "buck1_vol3:%d, buck1_vol4:%d\n",
247 selector, max8998->buck1_vol[0], max8998->buck1_vol[1],
248 max8998->buck1_vol[2], max8998->buck1_vol[3]);
249
250 if (gpio_is_valid(pdata->buck1_set1) &&
251 gpio_is_valid(pdata->buck1_set2)) {
252
253 /* check if requested voltage */
254 /* value is already defined */
255 for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
256 if (max8998->buck1_vol[j] == selector) {
257 max8998->buck1_idx = j;
258 buck1_gpio_set(pdata->buck1_set1,
259 pdata->buck1_set2, j);
260 goto buck1_exit;
261 }
262 }
263
264 if (pdata->buck_voltage_lock)
265 return -EINVAL;
266
267 /* no predefine regulator found */
268 max8998->buck1_idx = (buck1_last_val % 2) + 2;
269 dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
270 max8998->buck1_idx);
271 max8998->buck1_vol[max8998->buck1_idx] = selector;
272 ret = max8998_get_voltage_register(rdev, &reg,
273 &shift,
274 &mask);
275 ret = max8998_write_reg(i2c, reg, selector);
276 buck1_gpio_set(pdata->buck1_set1,
277 pdata->buck1_set2, max8998->buck1_idx);
278 buck1_last_val++;
279 buck1_exit:
280 dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
281 i2c->name, gpio_get_value(pdata->buck1_set1),
282 gpio_get_value(pdata->buck1_set2));
283 break;
284 } else {
285 ret = max8998_write_reg(i2c, reg, selector);
286 }
287 break;
288
289 case MAX8998_BUCK2:
290 dev_dbg(max8998->dev,
291 "BUCK2, selector:%d buck2_vol1:%d, buck2_vol2:%d\n",
292 selector, max8998->buck2_vol[0], max8998->buck2_vol[1]);
293 if (gpio_is_valid(pdata->buck2_set3)) {
294
295 /* check if requested voltage */
296 /* value is already defined */
297 for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
298 if (max8998->buck2_vol[j] == selector) {
299 max8998->buck2_idx = j;
300 buck2_gpio_set(pdata->buck2_set3, j);
301 goto buck2_exit;
302 }
303 }
304
305 if (pdata->buck_voltage_lock)
306 return -EINVAL;
307
308 max8998_get_voltage_register(rdev,
309 &reg, &shift, &mask);
310 ret = max8998_write_reg(i2c, reg, selector);
311 max8998->buck2_vol[max8998->buck2_idx] = selector;
312 buck2_gpio_set(pdata->buck2_set3, max8998->buck2_idx);
313 buck2_exit:
314 dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
315 gpio_get_value(pdata->buck2_set3));
316 } else {
317 ret = max8998_write_reg(i2c, reg, selector);
318 }
319 break;
320
321 case MAX8998_BUCK3:
322 case MAX8998_BUCK4:
323 ret = max8998_update_reg(i2c, reg, selector<<shift,
324 mask<<shift);
325 break;
326 }
327
328 return ret;
329 }
330
331 static int max8998_set_voltage_buck_time_sel(struct regulator_dev *rdev,
332 unsigned int old_selector,
333 unsigned int new_selector)
334 {
335 struct max8998_data *max8998 = rdev_get_drvdata(rdev);
336 struct i2c_client *i2c = max8998->iodev->i2c;
337 int buck = rdev_get_id(rdev);
338 u8 val = 0;
339 int difference, ret;
340
341 if (buck < MAX8998_BUCK1 || buck > MAX8998_BUCK4)
342 return -EINVAL;
343
344 /* Voltage stabilization */
345 ret = max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
346 if (ret)
347 return ret;
348
349 /* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
350 /* MAX8998 has ENRAMP bit implemented, so test it*/
351 if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
352 return 0;
353
354 difference = (new_selector - old_selector) * rdev->desc->uV_step / 1000;
355 if (difference > 0)
356 return DIV_ROUND_UP(difference, (val & 0x0f) + 1);
357
358 return 0;
359 }
360
361 static const struct regulator_ops max8998_ldo_ops = {
362 .list_voltage = regulator_list_voltage_linear,
363 .map_voltage = regulator_map_voltage_linear,
364 .is_enabled = max8998_ldo_is_enabled,
365 .enable = max8998_ldo_enable,
366 .disable = max8998_ldo_disable,
367 .get_voltage_sel = max8998_get_voltage_sel,
368 .set_voltage_sel = max8998_set_voltage_ldo_sel,
369 };
370
371 static const struct regulator_ops max8998_buck_ops = {
372 .list_voltage = regulator_list_voltage_linear,
373 .map_voltage = regulator_map_voltage_linear,
374 .is_enabled = max8998_ldo_is_enabled,
375 .enable = max8998_ldo_enable,
376 .disable = max8998_ldo_disable,
377 .get_voltage_sel = max8998_get_voltage_sel,
378 .set_voltage_sel = max8998_set_voltage_buck_sel,
379 .set_voltage_time_sel = max8998_set_voltage_buck_time_sel,
380 };
381
382 static const struct regulator_ops max8998_others_ops = {
383 .is_enabled = max8998_ldo_is_enabled,
384 .enable = max8998_ldo_enable,
385 .disable = max8998_ldo_disable,
386 };
387
388 #define MAX8998_LINEAR_REG(_name, _ops, _min, _step, _max) \
389 { \
390 .name = #_name, \
391 .id = MAX8998_##_name, \
392 .ops = _ops, \
393 .min_uV = (_min), \
394 .uV_step = (_step), \
395 .n_voltages = ((_max) - (_min)) / (_step) + 1, \
396 .type = REGULATOR_VOLTAGE, \
397 .owner = THIS_MODULE, \
398 }
399
400 #define MAX8998_OTHERS_REG(_name, _id) \
401 { \
402 .name = #_name, \
403 .id = _id, \
404 .ops = &max8998_others_ops, \
405 .type = REGULATOR_VOLTAGE, \
406 .owner = THIS_MODULE, \
407 }
408
409 static const struct regulator_desc regulators[] = {
410 MAX8998_LINEAR_REG(LDO2, &max8998_ldo_ops, 800000, 50000, 1300000),
411 MAX8998_LINEAR_REG(LDO3, &max8998_ldo_ops, 800000, 50000, 1300000),
412 MAX8998_LINEAR_REG(LDO4, &max8998_ldo_ops, 1600000, 100000, 3600000),
413 MAX8998_LINEAR_REG(LDO5, &max8998_ldo_ops, 1600000, 100000, 3600000),
414 MAX8998_LINEAR_REG(LDO6, &max8998_ldo_ops, 1600000, 100000, 3600000),
415 MAX8998_LINEAR_REG(LDO7, &max8998_ldo_ops, 1600000, 100000, 3600000),
416 MAX8998_LINEAR_REG(LDO8, &max8998_ldo_ops, 3000000, 100000, 3600000),
417 MAX8998_LINEAR_REG(LDO9, &max8998_ldo_ops, 2800000, 100000, 3100000),
418 MAX8998_LINEAR_REG(LDO10, &max8998_ldo_ops, 950000, 50000, 1300000),
419 MAX8998_LINEAR_REG(LDO11, &max8998_ldo_ops, 1600000, 100000, 3600000),
420 MAX8998_LINEAR_REG(LDO12, &max8998_ldo_ops, 800000, 100000, 3300000),
421 MAX8998_LINEAR_REG(LDO13, &max8998_ldo_ops, 800000, 100000, 3300000),
422 MAX8998_LINEAR_REG(LDO14, &max8998_ldo_ops, 1200000, 100000, 3300000),
423 MAX8998_LINEAR_REG(LDO15, &max8998_ldo_ops, 1200000, 100000, 3300000),
424 MAX8998_LINEAR_REG(LDO16, &max8998_ldo_ops, 1600000, 100000, 3600000),
425 MAX8998_LINEAR_REG(LDO17, &max8998_ldo_ops, 1600000, 100000, 3600000),
426 MAX8998_LINEAR_REG(BUCK1, &max8998_buck_ops, 750000, 25000, 1525000),
427 MAX8998_LINEAR_REG(BUCK2, &max8998_buck_ops, 750000, 25000, 1525000),
428 MAX8998_LINEAR_REG(BUCK3, &max8998_buck_ops, 1600000, 100000, 3600000),
429 MAX8998_LINEAR_REG(BUCK4, &max8998_buck_ops, 800000, 100000, 2300000),
430 MAX8998_OTHERS_REG(EN32KHz-AP, MAX8998_EN32KHZ_AP),
431 MAX8998_OTHERS_REG(EN32KHz-CP, MAX8998_EN32KHZ_CP),
432 MAX8998_OTHERS_REG(ENVICHG, MAX8998_ENVICHG),
433 MAX8998_OTHERS_REG(ESAFEOUT1, MAX8998_ESAFEOUT1),
434 MAX8998_OTHERS_REG(ESAFEOUT2, MAX8998_ESAFEOUT2),
435 };
436
437 static int max8998_pmic_dt_parse_dvs_gpio(struct max8998_dev *iodev,
438 struct max8998_platform_data *pdata,
439 struct device_node *pmic_np)
440 {
441 int gpio;
442
443 gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck1-dvs-gpios", 0);
444 if (!gpio_is_valid(gpio)) {
445 dev_err(iodev->dev, "invalid buck1 gpio[0]: %d\n", gpio);
446 return -EINVAL;
447 }
448 pdata->buck1_set1 = gpio;
449
450 gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck1-dvs-gpios", 1);
451 if (!gpio_is_valid(gpio)) {
452 dev_err(iodev->dev, "invalid buck1 gpio[1]: %d\n", gpio);
453 return -EINVAL;
454 }
455 pdata->buck1_set2 = gpio;
456
457 gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck2-dvs-gpio", 0);
458 if (!gpio_is_valid(gpio)) {
459 dev_err(iodev->dev, "invalid buck 2 gpio: %d\n", gpio);
460 return -EINVAL;
461 }
462 pdata->buck2_set3 = gpio;
463
464 return 0;
465 }
466
467 static int max8998_pmic_dt_parse_pdata(struct max8998_dev *iodev,
468 struct max8998_platform_data *pdata)
469 {
470 struct device_node *pmic_np = iodev->dev->of_node;
471 struct device_node *regulators_np, *reg_np;
472 struct max8998_regulator_data *rdata;
473 unsigned int i;
474 int ret;
475
476 regulators_np = of_get_child_by_name(pmic_np, "regulators");
477 if (!regulators_np) {
478 dev_err(iodev->dev, "could not find regulators sub-node\n");
479 return -EINVAL;
480 }
481
482 /* count the number of regulators to be supported in pmic */
483 pdata->num_regulators = of_get_child_count(regulators_np);
484
485 rdata = devm_kcalloc(iodev->dev,
486 pdata->num_regulators, sizeof(*rdata),
487 GFP_KERNEL);
488 if (!rdata) {
489 of_node_put(regulators_np);
490 return -ENOMEM;
491 }
492
493 pdata->regulators = rdata;
494 for (i = 0; i < ARRAY_SIZE(regulators); ++i) {
495 reg_np = of_get_child_by_name(regulators_np,
496 regulators[i].name);
497 if (!reg_np)
498 continue;
499
500 rdata->id = regulators[i].id;
501 rdata->initdata = of_get_regulator_init_data(iodev->dev,
502 reg_np,
503 &regulators[i]);
504 rdata->reg_node = reg_np;
505 ++rdata;
506 }
507 pdata->num_regulators = rdata - pdata->regulators;
508
509 of_node_put(reg_np);
510 of_node_put(regulators_np);
511
512 ret = max8998_pmic_dt_parse_dvs_gpio(iodev, pdata, pmic_np);
513 if (ret)
514 return -EINVAL;
515
516 if (of_find_property(pmic_np, "max8998,pmic-buck-voltage-lock", NULL))
517 pdata->buck_voltage_lock = true;
518
519 ret = of_property_read_u32(pmic_np,
520 "max8998,pmic-buck1-default-dvs-idx",
521 &pdata->buck1_default_idx);
522 if (!ret && pdata->buck1_default_idx >= 4) {
523 pdata->buck1_default_idx = 0;
524 dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
525 }
526
527 ret = of_property_read_u32(pmic_np,
528 "max8998,pmic-buck2-default-dvs-idx",
529 &pdata->buck2_default_idx);
530 if (!ret && pdata->buck2_default_idx >= 2) {
531 pdata->buck2_default_idx = 0;
532 dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
533 }
534
535 ret = of_property_read_u32_array(pmic_np,
536 "max8998,pmic-buck1-dvs-voltage",
537 pdata->buck1_voltage,
538 ARRAY_SIZE(pdata->buck1_voltage));
539 if (ret) {
540 dev_err(iodev->dev, "buck1 voltages not specified\n");
541 return -EINVAL;
542 }
543
544 ret = of_property_read_u32_array(pmic_np,
545 "max8998,pmic-buck2-dvs-voltage",
546 pdata->buck2_voltage,
547 ARRAY_SIZE(pdata->buck2_voltage));
548 if (ret) {
549 dev_err(iodev->dev, "buck2 voltages not specified\n");
550 return -EINVAL;
551 }
552
553 return 0;
554 }
555
556 static int max8998_pmic_probe(struct platform_device *pdev)
557 {
558 struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
559 struct max8998_platform_data *pdata = iodev->pdata;
560 struct regulator_config config = { };
561 struct regulator_dev *rdev;
562 struct max8998_data *max8998;
563 struct i2c_client *i2c;
564 int i, ret;
565 unsigned int v;
566
567 if (!pdata) {
568 dev_err(pdev->dev.parent, "No platform init data supplied\n");
569 return -ENODEV;
570 }
571
572 if (IS_ENABLED(CONFIG_OF) && iodev->dev->of_node) {
573 ret = max8998_pmic_dt_parse_pdata(iodev, pdata);
574 if (ret)
575 return ret;
576 }
577
578 max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_data),
579 GFP_KERNEL);
580 if (!max8998)
581 return -ENOMEM;
582
583 max8998->dev = &pdev->dev;
584 max8998->iodev = iodev;
585 max8998->num_regulators = pdata->num_regulators;
586 platform_set_drvdata(pdev, max8998);
587 i2c = max8998->iodev->i2c;
588
589 max8998->buck1_idx = pdata->buck1_default_idx;
590 max8998->buck2_idx = pdata->buck2_default_idx;
591
592 /* NOTE: */
593 /* For unused GPIO NOT marked as -1 (thereof equal to 0) WARN_ON */
594 /* will be displayed */
595
596 /* Check if MAX8998 voltage selection GPIOs are defined */
597 if (gpio_is_valid(pdata->buck1_set1) &&
598 gpio_is_valid(pdata->buck1_set2)) {
599 /* Check if SET1 is not equal to 0 */
600 if (!pdata->buck1_set1) {
601 dev_err(&pdev->dev,
602 "MAX8998 SET1 GPIO defined as 0 !\n");
603 WARN_ON(!pdata->buck1_set1);
604 return -EIO;
605 }
606 /* Check if SET2 is not equal to 0 */
607 if (!pdata->buck1_set2) {
608 dev_err(&pdev->dev,
609 "MAX8998 SET2 GPIO defined as 0 !\n");
610 WARN_ON(!pdata->buck1_set2);
611 return -EIO;
612 }
613
614 gpio_request(pdata->buck1_set1, "MAX8998 BUCK1_SET1");
615 gpio_direction_output(pdata->buck1_set1,
616 max8998->buck1_idx & 0x1);
617
618
619 gpio_request(pdata->buck1_set2, "MAX8998 BUCK1_SET2");
620 gpio_direction_output(pdata->buck1_set2,
621 (max8998->buck1_idx >> 1) & 0x1);
622
623 /* Set predefined values for BUCK1 registers */
624 for (v = 0; v < ARRAY_SIZE(pdata->buck1_voltage); ++v) {
625 int index = MAX8998_BUCK1 - MAX8998_LDO2;
626
627 i = 0;
628 while (regulators[index].min_uV +
629 regulators[index].uV_step * i
630 < pdata->buck1_voltage[v])
631 i++;
632
633 max8998->buck1_vol[v] = i;
634 ret = max8998_write_reg(i2c,
635 MAX8998_REG_BUCK1_VOLTAGE1 + v, i);
636 if (ret)
637 return ret;
638 }
639 }
640
641 if (gpio_is_valid(pdata->buck2_set3)) {
642 /* Check if SET3 is not equal to 0 */
643 if (!pdata->buck2_set3) {
644 dev_err(&pdev->dev,
645 "MAX8998 SET3 GPIO defined as 0 !\n");
646 WARN_ON(!pdata->buck2_set3);
647 return -EIO;
648 }
649 gpio_request(pdata->buck2_set3, "MAX8998 BUCK2_SET3");
650 gpio_direction_output(pdata->buck2_set3,
651 max8998->buck2_idx & 0x1);
652
653 /* Set predefined values for BUCK2 registers */
654 for (v = 0; v < ARRAY_SIZE(pdata->buck2_voltage); ++v) {
655 int index = MAX8998_BUCK2 - MAX8998_LDO2;
656
657 i = 0;
658 while (regulators[index].min_uV +
659 regulators[index].uV_step * i
660 < pdata->buck2_voltage[v])
661 i++;
662
663 max8998->buck2_vol[v] = i;
664 ret = max8998_write_reg(i2c,
665 MAX8998_REG_BUCK2_VOLTAGE1 + v, i);
666 if (ret)
667 return ret;
668 }
669 }
670
671 for (i = 0; i < pdata->num_regulators; i++) {
672 int index = pdata->regulators[i].id - MAX8998_LDO2;
673
674 config.dev = max8998->dev;
675 config.of_node = pdata->regulators[i].reg_node;
676 config.init_data = pdata->regulators[i].initdata;
677 config.driver_data = max8998;
678
679 rdev = devm_regulator_register(&pdev->dev, &regulators[index],
680 &config);
681 if (IS_ERR(rdev)) {
682 ret = PTR_ERR(rdev);
683 dev_err(max8998->dev, "regulator %s init failed (%d)\n",
684 regulators[index].name, ret);
685 return ret;
686 }
687 }
688
689 return 0;
690 }
691
692 static const struct platform_device_id max8998_pmic_id[] = {
693 { "max8998-pmic", TYPE_MAX8998 },
694 { "lp3974-pmic", TYPE_LP3974 },
695 { }
696 };
697 MODULE_DEVICE_TABLE(platform, max8998_pmic_id);
698
699 static struct platform_driver max8998_pmic_driver = {
700 .driver = {
701 .name = "max8998-pmic",
702 },
703 .probe = max8998_pmic_probe,
704 .id_table = max8998_pmic_id,
705 };
706
707 static int __init max8998_pmic_init(void)
708 {
709 return platform_driver_register(&max8998_pmic_driver);
710 }
711 subsys_initcall(max8998_pmic_init);
712
713 static void __exit max8998_pmic_cleanup(void)
714 {
715 platform_driver_unregister(&max8998_pmic_driver);
716 }
717 module_exit(max8998_pmic_cleanup);
718
719 MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
720 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
721 MODULE_LICENSE("GPL");
Linux with added FPC-III support