Merge branch 'drm-fixes-4.19' of git://people.freedesktop.org/~agd5f/linux into drm...
[linux-2.6-microblaze.git] / drivers / regulator / da9055-regulator.c
1 /*
2 * Regulator driver for DA9055 PMIC
3 *
4 * Copyright(c) 2012 Dialog Semiconductor Ltd.
5 *
6 * Author: David Dajun Chen <dchen@diasemi.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 */
14
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/err.h>
18 #include <linux/gpio.h>
19 #include <linux/gpio/consumer.h>
20 #include <linux/platform_device.h>
21 #include <linux/regulator/driver.h>
22 #include <linux/regulator/machine.h>
23 #include <linux/of.h>
24 #include <linux/regulator/of_regulator.h>
25
26 #include <linux/mfd/da9055/core.h>
27 #include <linux/mfd/da9055/reg.h>
28 #include <linux/mfd/da9055/pdata.h>
29
30 #define DA9055_MIN_UA           0
31 #define DA9055_MAX_UA           3
32
33 #define DA9055_LDO_MODE_SYNC    0
34 #define DA9055_LDO_MODE_SLEEP   1
35
36 #define DA9055_BUCK_MODE_SLEEP  1
37 #define DA9055_BUCK_MODE_SYNC   2
38 #define DA9055_BUCK_MODE_AUTO   3
39
40 /* DA9055 REGULATOR IDs */
41 #define DA9055_ID_BUCK1 0
42 #define DA9055_ID_BUCK2 1
43 #define DA9055_ID_LDO1          2
44 #define DA9055_ID_LDO2          3
45 #define DA9055_ID_LDO3          4
46 #define DA9055_ID_LDO4          5
47 #define DA9055_ID_LDO5          6
48 #define DA9055_ID_LDO6          7
49
50 /* DA9055 BUCK current limit */
51 static const int da9055_current_limits[] = { 500000, 600000, 700000, 800000 };
52
53 struct da9055_conf_reg {
54         int reg;
55         int sel_mask;
56         int en_mask;
57 };
58
59 struct da9055_volt_reg {
60         int reg_a;
61         int reg_b;
62         int sl_shift;
63         int v_mask;
64 };
65
66 struct da9055_mode_reg {
67         int reg;
68         int mask;
69         int shift;
70 };
71
72 struct da9055_regulator_info {
73         struct regulator_desc reg_desc;
74         struct da9055_conf_reg conf;
75         struct da9055_volt_reg volt;
76         struct da9055_mode_reg mode;
77 };
78
79 struct da9055_regulator {
80         struct da9055 *da9055;
81         struct da9055_regulator_info *info;
82         struct regulator_dev *rdev;
83         enum gpio_select reg_rselect;
84 };
85
86 static unsigned int da9055_buck_get_mode(struct regulator_dev *rdev)
87 {
88         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
89         struct da9055_regulator_info *info = regulator->info;
90         int ret, mode = 0;
91
92         ret = da9055_reg_read(regulator->da9055, info->mode.reg);
93         if (ret < 0)
94                 return ret;
95
96         switch ((ret & info->mode.mask) >> info->mode.shift) {
97         case DA9055_BUCK_MODE_SYNC:
98                 mode = REGULATOR_MODE_FAST;
99                 break;
100         case DA9055_BUCK_MODE_AUTO:
101                 mode = REGULATOR_MODE_NORMAL;
102                 break;
103         case DA9055_BUCK_MODE_SLEEP:
104                 mode = REGULATOR_MODE_STANDBY;
105                 break;
106         }
107
108         return mode;
109 }
110
111 static int da9055_buck_set_mode(struct regulator_dev *rdev,
112                                         unsigned int mode)
113 {
114         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
115         struct da9055_regulator_info *info = regulator->info;
116         int val = 0;
117
118         switch (mode) {
119         case REGULATOR_MODE_FAST:
120                 val = DA9055_BUCK_MODE_SYNC << info->mode.shift;
121                 break;
122         case REGULATOR_MODE_NORMAL:
123                 val = DA9055_BUCK_MODE_AUTO << info->mode.shift;
124                 break;
125         case REGULATOR_MODE_STANDBY:
126                 val = DA9055_BUCK_MODE_SLEEP << info->mode.shift;
127                 break;
128         }
129
130         return da9055_reg_update(regulator->da9055, info->mode.reg,
131                                  info->mode.mask, val);
132 }
133
134 static unsigned int da9055_ldo_get_mode(struct regulator_dev *rdev)
135 {
136         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
137         struct da9055_regulator_info *info = regulator->info;
138         int ret;
139
140         ret = da9055_reg_read(regulator->da9055, info->volt.reg_b);
141         if (ret < 0)
142                 return ret;
143
144         if (ret >> info->volt.sl_shift)
145                 return REGULATOR_MODE_STANDBY;
146         else
147                 return REGULATOR_MODE_NORMAL;
148 }
149
150 static int da9055_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
151 {
152         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
153         struct da9055_regulator_info *info = regulator->info;
154         struct da9055_volt_reg volt = info->volt;
155         int val = 0;
156
157         switch (mode) {
158         case REGULATOR_MODE_NORMAL:
159         case REGULATOR_MODE_FAST:
160                 val = DA9055_LDO_MODE_SYNC;
161                 break;
162         case REGULATOR_MODE_STANDBY:
163                 val = DA9055_LDO_MODE_SLEEP;
164                 break;
165         }
166
167         return da9055_reg_update(regulator->da9055, volt.reg_b,
168                                  1 << volt.sl_shift,
169                                  val << volt.sl_shift);
170 }
171
172 static int da9055_buck_get_current_limit(struct regulator_dev *rdev)
173 {
174         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
175         struct da9055_regulator_info *info = regulator->info;
176         int ret;
177
178         ret = da9055_reg_read(regulator->da9055, DA9055_REG_BUCK_LIM);
179         if (ret < 0)
180                 return ret;
181
182         ret &= info->mode.mask;
183         return da9055_current_limits[ret >> info->mode.shift];
184 }
185
186 static int da9055_buck_set_current_limit(struct regulator_dev *rdev, int min_uA,
187                                          int max_uA)
188 {
189         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
190         struct da9055_regulator_info *info = regulator->info;
191         int i;
192
193         for (i = ARRAY_SIZE(da9055_current_limits) - 1; i >= 0; i--) {
194                 if ((min_uA <= da9055_current_limits[i]) &&
195                     (da9055_current_limits[i] <= max_uA))
196                         return da9055_reg_update(regulator->da9055,
197                                                  DA9055_REG_BUCK_LIM,
198                                                  info->mode.mask,
199                                                  i << info->mode.shift);
200         }
201
202         return -EINVAL;
203 }
204
205 static int da9055_regulator_get_voltage_sel(struct regulator_dev *rdev)
206 {
207         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
208         struct da9055_regulator_info *info = regulator->info;
209         struct da9055_volt_reg volt = info->volt;
210         int ret, sel;
211
212         /*
213          * There are two voltage register set A & B for voltage ramping but
214          * either one of then can be active therefore we first determine
215          * the active register set.
216          */
217         ret = da9055_reg_read(regulator->da9055, info->conf.reg);
218         if (ret < 0)
219                 return ret;
220
221         ret &= info->conf.sel_mask;
222
223         /* Get the voltage for the active register set A/B */
224         if (ret == DA9055_REGUALTOR_SET_A)
225                 ret = da9055_reg_read(regulator->da9055, volt.reg_a);
226         else
227                 ret = da9055_reg_read(regulator->da9055, volt.reg_b);
228
229         if (ret < 0)
230                 return ret;
231
232         sel = (ret & volt.v_mask);
233         return sel;
234 }
235
236 static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev,
237                                             unsigned int selector)
238 {
239         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
240         struct da9055_regulator_info *info = regulator->info;
241         int ret;
242
243         /*
244          * Regulator register set A/B is not selected through GPIO therefore
245          * we use default register set A for voltage ramping.
246          */
247         if (regulator->reg_rselect == NO_GPIO) {
248                 /* Select register set A */
249                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
250                                         info->conf.sel_mask, DA9055_SEL_REG_A);
251                 if (ret < 0)
252                         return ret;
253
254                 /* Set the voltage */
255                 return da9055_reg_update(regulator->da9055, info->volt.reg_a,
256                                          info->volt.v_mask, selector);
257         }
258
259         /*
260          * Here regulator register set A/B is selected through GPIO.
261          * Therefore we first determine the selected register set A/B and
262          * then set the desired voltage for that register set A/B.
263          */
264         ret = da9055_reg_read(regulator->da9055, info->conf.reg);
265         if (ret < 0)
266                 return ret;
267
268         ret &= info->conf.sel_mask;
269
270         /* Set the voltage */
271         if (ret == DA9055_REGUALTOR_SET_A)
272                 return da9055_reg_update(regulator->da9055, info->volt.reg_a,
273                                          info->volt.v_mask, selector);
274         else
275                 return da9055_reg_update(regulator->da9055, info->volt.reg_b,
276                                          info->volt.v_mask, selector);
277 }
278
279 static int da9055_regulator_set_suspend_voltage(struct regulator_dev *rdev,
280                                                 int uV)
281 {
282         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
283         struct da9055_regulator_info *info = regulator->info;
284         int ret;
285
286         /* Select register set B for suspend voltage ramping. */
287         if (regulator->reg_rselect == NO_GPIO) {
288                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
289                                         info->conf.sel_mask, DA9055_SEL_REG_B);
290                 if (ret < 0)
291                         return ret;
292         }
293
294         ret = regulator_map_voltage_linear(rdev, uV, uV);
295         if (ret < 0)
296                 return ret;
297
298         return da9055_reg_update(regulator->da9055, info->volt.reg_b,
299                                  info->volt.v_mask, ret);
300 }
301
302 static int da9055_suspend_enable(struct regulator_dev *rdev)
303 {
304         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
305         struct da9055_regulator_info *info = regulator->info;
306
307         /* Select register set B for voltage ramping. */
308         if (regulator->reg_rselect == NO_GPIO)
309                 return da9055_reg_update(regulator->da9055, info->conf.reg,
310                                         info->conf.sel_mask, DA9055_SEL_REG_B);
311         else
312                 return 0;
313 }
314
315 static int da9055_suspend_disable(struct regulator_dev *rdev)
316 {
317         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
318         struct da9055_regulator_info *info = regulator->info;
319
320         /* Diselect register set B. */
321         if (regulator->reg_rselect == NO_GPIO)
322                 return da9055_reg_update(regulator->da9055, info->conf.reg,
323                                         info->conf.sel_mask, DA9055_SEL_REG_A);
324         else
325                 return 0;
326 }
327
328 static const struct regulator_ops da9055_buck_ops = {
329         .get_mode = da9055_buck_get_mode,
330         .set_mode = da9055_buck_set_mode,
331
332         .get_current_limit = da9055_buck_get_current_limit,
333         .set_current_limit = da9055_buck_set_current_limit,
334
335         .get_voltage_sel = da9055_regulator_get_voltage_sel,
336         .set_voltage_sel = da9055_regulator_set_voltage_sel,
337         .list_voltage = regulator_list_voltage_linear,
338         .map_voltage = regulator_map_voltage_linear,
339         .is_enabled = regulator_is_enabled_regmap,
340         .enable = regulator_enable_regmap,
341         .disable = regulator_disable_regmap,
342
343         .set_suspend_voltage = da9055_regulator_set_suspend_voltage,
344         .set_suspend_enable = da9055_suspend_enable,
345         .set_suspend_disable = da9055_suspend_disable,
346         .set_suspend_mode = da9055_buck_set_mode,
347 };
348
349 static const struct regulator_ops da9055_ldo_ops = {
350         .get_mode = da9055_ldo_get_mode,
351         .set_mode = da9055_ldo_set_mode,
352
353         .get_voltage_sel = da9055_regulator_get_voltage_sel,
354         .set_voltage_sel = da9055_regulator_set_voltage_sel,
355         .list_voltage = regulator_list_voltage_linear,
356         .map_voltage = regulator_map_voltage_linear,
357         .is_enabled = regulator_is_enabled_regmap,
358         .enable = regulator_enable_regmap,
359         .disable = regulator_disable_regmap,
360
361         .set_suspend_voltage = da9055_regulator_set_suspend_voltage,
362         .set_suspend_enable = da9055_suspend_enable,
363         .set_suspend_disable = da9055_suspend_disable,
364         .set_suspend_mode = da9055_ldo_set_mode,
365
366 };
367
368 #define DA9055_LDO(_id, step, min, max, vbits, voffset) \
369 {\
370         .reg_desc = {\
371                 .name = #_id,\
372                 .ops = &da9055_ldo_ops,\
373                 .type = REGULATOR_VOLTAGE,\
374                 .id = DA9055_ID_##_id,\
375                 .n_voltages = (max - min) / step + 1 + (voffset), \
376                 .enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
377                 .enable_mask = 1, \
378                 .min_uV = (min) * 1000,\
379                 .uV_step = (step) * 1000,\
380                 .linear_min_sel = (voffset),\
381                 .owner = THIS_MODULE,\
382         },\
383         .conf = {\
384                 .reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
385                 .sel_mask = (1 << 4),\
386                 .en_mask = 1,\
387         },\
388         .volt = {\
389                 .reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
390                 .reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
391                 .sl_shift = 7,\
392                 .v_mask = (1 << (vbits)) - 1,\
393         },\
394 }
395
396 #define DA9055_BUCK(_id, step, min, max, vbits, voffset, mbits, sbits) \
397 {\
398         .reg_desc = {\
399                 .name = #_id,\
400                 .ops = &da9055_buck_ops,\
401                 .type = REGULATOR_VOLTAGE,\
402                 .id = DA9055_ID_##_id,\
403                 .n_voltages = (max - min) / step + 1 + (voffset), \
404                 .enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
405                 .enable_mask = 1,\
406                 .min_uV = (min) * 1000,\
407                 .uV_step = (step) * 1000,\
408                 .linear_min_sel = (voffset),\
409                 .owner = THIS_MODULE,\
410         },\
411         .conf = {\
412                 .reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
413                 .sel_mask = (1 << 4),\
414                 .en_mask = 1,\
415         },\
416         .volt = {\
417                 .reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
418                 .reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
419                 .sl_shift = 7,\
420                 .v_mask = (1 << (vbits)) - 1,\
421         },\
422         .mode = {\
423                 .reg = DA9055_REG_BCORE_MODE,\
424                 .mask = (mbits),\
425                 .shift = (sbits),\
426         },\
427 }
428
429 static struct da9055_regulator_info da9055_regulator_info[] = {
430         DA9055_BUCK(BUCK1, 25, 725, 2075, 6, 9, 0xc, 2),
431         DA9055_BUCK(BUCK2, 25, 925, 2500, 6, 0, 3, 0),
432         DA9055_LDO(LDO1, 50, 900, 3300, 6, 2),
433         DA9055_LDO(LDO2, 50, 900, 3300, 6, 3),
434         DA9055_LDO(LDO3, 50, 900, 3300, 6, 2),
435         DA9055_LDO(LDO4, 50, 900, 3300, 6, 2),
436         DA9055_LDO(LDO5, 50, 900, 2750, 6, 2),
437         DA9055_LDO(LDO6, 20, 900, 3300, 7, 0),
438 };
439
440 /*
441  * Configures regulator to be controlled either through GPIO 1 or 2.
442  * GPIO can control regulator state and/or select the regulator register
443  * set A/B for voltage ramping.
444  */
445 static int da9055_gpio_init(struct da9055_regulator *regulator,
446                             struct regulator_config *config,
447                             struct da9055_pdata *pdata, int id)
448 {
449         struct da9055_regulator_info *info = regulator->info;
450         int ret = 0;
451
452         if (!pdata)
453                 return 0;
454
455         if (pdata->gpio_ren && pdata->gpio_ren[id]) {
456                 char name[18];
457                 int gpio_mux = pdata->gpio_ren[id];
458
459                 config->ena_gpiod = pdata->ena_gpiods[id];
460                 config->ena_gpio_invert = 1;
461
462                 /*
463                  * GPI pin is muxed with regulator to control the
464                  * regulator state.
465                  */
466                 sprintf(name, "DA9055 GPI %d", gpio_mux);
467                 ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
468                                             name);
469                 if (ret < 0)
470                         goto err;
471
472                 /*
473                  * Let the regulator know that its state is controlled
474                  * through GPI.
475                  */
476                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
477                                         DA9055_E_GPI_MASK,
478                                         pdata->reg_ren[id]
479                                         << DA9055_E_GPI_SHIFT);
480                 if (ret < 0)
481                         goto err;
482         }
483
484         if (pdata->gpio_rsel && pdata->gpio_rsel[id]) {
485                 char name[18];
486                 int gpio_mux = pdata->gpio_rsel[id];
487
488                 regulator->reg_rselect = pdata->reg_rsel[id];
489
490                 /*
491                  * GPI pin is muxed with regulator to select the
492                  * regulator register set A/B for voltage ramping.
493                  */
494                 sprintf(name, "DA9055 GPI %d", gpio_mux);
495                 ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
496                                             name);
497                 if (ret < 0)
498                         goto err;
499
500                 /*
501                  * Let the regulator know that its register set A/B
502                  * will be selected through GPI for voltage ramping.
503                  */
504                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
505                                         DA9055_V_GPI_MASK,
506                                         pdata->reg_rsel[id]
507                                         << DA9055_V_GPI_SHIFT);
508         }
509
510 err:
511         return ret;
512 }
513
514 static irqreturn_t da9055_ldo5_6_oc_irq(int irq, void *data)
515 {
516         struct da9055_regulator *regulator = data;
517
518         regulator_notifier_call_chain(regulator->rdev,
519                                       REGULATOR_EVENT_OVER_CURRENT, NULL);
520
521         return IRQ_HANDLED;
522 }
523
524 static inline struct da9055_regulator_info *find_regulator_info(int id)
525 {
526         struct da9055_regulator_info *info;
527         int i;
528
529         for (i = 0; i < ARRAY_SIZE(da9055_regulator_info); i++) {
530                 info = &da9055_regulator_info[i];
531                 if (info->reg_desc.id == id)
532                         return info;
533         }
534
535         return NULL;
536 }
537
538 #ifdef CONFIG_OF
539 static struct of_regulator_match da9055_reg_matches[] = {
540         { .name = "BUCK1", },
541         { .name = "BUCK2", },
542         { .name = "LDO1", },
543         { .name = "LDO2", },
544         { .name = "LDO3", },
545         { .name = "LDO4", },
546         { .name = "LDO5", },
547         { .name = "LDO6", },
548 };
549
550 static int da9055_regulator_dt_init(struct platform_device *pdev,
551                                     struct da9055_regulator *regulator,
552                                     struct regulator_config *config,
553                                     int regid)
554 {
555         struct device_node *nproot, *np;
556         int ret;
557
558         nproot = of_node_get(pdev->dev.parent->of_node);
559         if (!nproot)
560                 return -ENODEV;
561
562         np = of_get_child_by_name(nproot, "regulators");
563         if (!np)
564                 return -ENODEV;
565
566         ret = of_regulator_match(&pdev->dev, np, &da9055_reg_matches[regid], 1);
567         of_node_put(nproot);
568         if (ret < 0) {
569                 dev_err(&pdev->dev, "Error matching regulator: %d\n", ret);
570                 return ret;
571         }
572
573         config->init_data = da9055_reg_matches[regid].init_data;
574         config->of_node = da9055_reg_matches[regid].of_node;
575
576         if (!config->of_node)
577                 return -ENODEV;
578
579         return 0;
580 }
581 #else
582 static inline int da9055_regulator_dt_init(struct platform_device *pdev,
583                                        struct da9055_regulator *regulator,
584                                        struct regulator_config *config,
585                                        int regid)
586 {
587         return -ENODEV;
588 }
589 #endif /* CONFIG_OF */
590
591 static int da9055_regulator_probe(struct platform_device *pdev)
592 {
593         struct regulator_config config = { };
594         struct da9055_regulator *regulator;
595         struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
596         struct da9055_pdata *pdata = dev_get_platdata(da9055->dev);
597         int ret, irq;
598
599         regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9055_regulator),
600                                  GFP_KERNEL);
601         if (!regulator)
602                 return -ENOMEM;
603
604         regulator->info = find_regulator_info(pdev->id);
605         if (regulator->info == NULL) {
606                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
607                 return -EINVAL;
608         }
609
610         regulator->da9055 = da9055;
611         config.dev = &pdev->dev;
612         config.driver_data = regulator;
613         config.regmap = da9055->regmap;
614
615         if (pdata && pdata->regulators) {
616                 config.init_data = pdata->regulators[pdev->id];
617         } else {
618                 ret = da9055_regulator_dt_init(pdev, regulator, &config,
619                                                pdev->id);
620                 if (ret < 0)
621                         return ret;
622         }
623
624         ret = da9055_gpio_init(regulator, &config, pdata, pdev->id);
625         if (ret < 0)
626                 return ret;
627
628         regulator->rdev = devm_regulator_register(&pdev->dev,
629                                                   &regulator->info->reg_desc,
630                                                   &config);
631         if (IS_ERR(regulator->rdev)) {
632                 dev_err(&pdev->dev, "Failed to register regulator %s\n",
633                         regulator->info->reg_desc.name);
634                 return PTR_ERR(regulator->rdev);
635         }
636
637         /* Only LDO 5 and 6 has got the over current interrupt */
638         if (pdev->id == DA9055_ID_LDO5 || pdev->id ==  DA9055_ID_LDO6) {
639                 irq = platform_get_irq_byname(pdev, "REGULATOR");
640                 if (irq < 0)
641                         return irq;
642
643                 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
644                                                 da9055_ldo5_6_oc_irq,
645                                                 IRQF_TRIGGER_HIGH |
646                                                 IRQF_ONESHOT |
647                                                 IRQF_PROBE_SHARED,
648                                                 pdev->name, regulator);
649                 if (ret != 0) {
650                         if (ret != -EBUSY) {
651                                 dev_err(&pdev->dev,
652                                 "Failed to request Regulator IRQ %d: %d\n",
653                                 irq, ret);
654                                 return ret;
655                         }
656                 }
657         }
658
659         platform_set_drvdata(pdev, regulator);
660
661         return 0;
662 }
663
664 static struct platform_driver da9055_regulator_driver = {
665         .probe = da9055_regulator_probe,
666         .driver = {
667                 .name = "da9055-regulator",
668         },
669 };
670
671 static int __init da9055_regulator_init(void)
672 {
673         return platform_driver_register(&da9055_regulator_driver);
674 }
675 subsys_initcall(da9055_regulator_init);
676
677 static void __exit da9055_regulator_exit(void)
678 {
679         platform_driver_unregister(&da9055_regulator_driver);
680 }
681 module_exit(da9055_regulator_exit);
682
683 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
684 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9055 PMIC");
685 MODULE_LICENSE("GPL");
686 MODULE_ALIAS("platform:da9055-regulator");