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max8998.c
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1 /*
2  * max8998.c - Voltage regulator driver for the Maxim 8998
3  *
4  * Copyright (C) 2009-2010 Samsung Electronics
5  * Kyungmin Park <[email protected]>
6  * Marek Szyprowski <[email protected]>
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 
36 struct 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 
48 struct voltage_map_desc {
49  int min;
50  int max;
51  int step;
52 };
53 
54 /* Voltage maps */
55 static const struct voltage_map_desc ldo23_voltage_map_desc = {
56  .min = 800, .step = 50, .max = 1300,
57 };
58 static const struct voltage_map_desc ldo456711_voltage_map_desc = {
59  .min = 1600, .step = 100, .max = 3600,
60 };
61 static const struct voltage_map_desc ldo8_voltage_map_desc = {
62  .min = 3000, .step = 100, .max = 3600,
63 };
64 static const struct voltage_map_desc ldo9_voltage_map_desc = {
65  .min = 2800, .step = 100, .max = 3100,
66 };
67 static const struct voltage_map_desc ldo10_voltage_map_desc = {
68  .min = 950, .step = 50, .max = 1300,
69 };
70 static const struct voltage_map_desc ldo1213_voltage_map_desc = {
71  .min = 800, .step = 100, .max = 3300,
72 };
73 static const struct voltage_map_desc ldo1415_voltage_map_desc = {
74  .min = 1200, .step = 100, .max = 3300,
75 };
76 static const struct voltage_map_desc ldo1617_voltage_map_desc = {
77  .min = 1600, .step = 100, .max = 3600,
78 };
79 static const struct voltage_map_desc buck12_voltage_map_desc = {
80  .min = 750, .step = 25, .max = 1525,
81 };
82 static const struct voltage_map_desc buck3_voltage_map_desc = {
83  .min = 1600, .step = 100, .max = 3600,
84 };
85 static const struct voltage_map_desc buck4_voltage_map_desc = {
86  .min = 800, .step = 100, .max = 2300,
87 };
88 
89 static 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 
114 static int max8998_get_enable_register(struct regulator_dev *rdev,
115  int *reg, int *shift)
116 {
117  int ldo = rdev_get_id(rdev);
118 
119  switch (ldo) {
120  case MAX8998_LDO2 ... MAX8998_LDO5:
121  *reg = MAX8998_REG_ONOFF1;
122  *shift = 3 - (ldo - MAX8998_LDO2);
123  break;
124  case MAX8998_LDO6 ... MAX8998_LDO13:
125  *reg = MAX8998_REG_ONOFF2;
126  *shift = 7 - (ldo - MAX8998_LDO6);
127  break;
128  case MAX8998_LDO14 ... MAX8998_LDO17:
129  *reg = MAX8998_REG_ONOFF3;
130  *shift = 7 - (ldo - MAX8998_LDO14);
131  break;
132  case MAX8998_BUCK1 ... MAX8998_BUCK4:
133  *reg = MAX8998_REG_ONOFF1;
134  *shift = 7 - (ldo - MAX8998_BUCK1);
135  break;
136  case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
137  *reg = MAX8998_REG_ONOFF4;
138  *shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
139  break;
140  case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
141  *reg = MAX8998_REG_CHGR2;
142  *shift = 7 - (ldo - MAX8998_ESAFEOUT1);
143  break;
144  default:
145  return -EINVAL;
146  }
147 
148  return 0;
149 }
150 
151 static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
152 {
153  struct max8998_data *max8998 = rdev_get_drvdata(rdev);
154  struct i2c_client *i2c = max8998->iodev->i2c;
155  int ret, reg, shift = 8;
156  u8 val;
157 
158  ret = max8998_get_enable_register(rdev, &reg, &shift);
159  if (ret)
160  return ret;
161 
162  ret = max8998_read_reg(i2c, reg, &val);
163  if (ret)
164  return ret;
165 
166  return val & (1 << shift);
167 }
168 
169 static int max8998_ldo_enable(struct regulator_dev *rdev)
170 {
171  struct max8998_data *max8998 = rdev_get_drvdata(rdev);
172  struct i2c_client *i2c = max8998->iodev->i2c;
173  int reg, shift = 8, ret;
174 
175  ret = max8998_get_enable_register(rdev, &reg, &shift);
176  if (ret)
177  return ret;
178 
179  return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
180 }
181 
182 static int max8998_ldo_disable(struct regulator_dev *rdev)
183 {
184  struct max8998_data *max8998 = rdev_get_drvdata(rdev);
185  struct i2c_client *i2c = max8998->iodev->i2c;
186  int reg, shift = 8, ret;
187 
188  ret = max8998_get_enable_register(rdev, &reg, &shift);
189  if (ret)
190  return ret;
191 
192  return max8998_update_reg(i2c, reg, 0, 1<<shift);
193 }
194 
195 static int max8998_get_voltage_register(struct regulator_dev *rdev,
196  int *_reg, int *_shift, int *_mask)
197 {
198  int ldo = rdev_get_id(rdev);
199  struct max8998_data *max8998 = rdev_get_drvdata(rdev);
200  int reg, shift = 0, mask = 0xff;
201 
202  switch (ldo) {
203  case MAX8998_LDO2 ... MAX8998_LDO3:
204  reg = MAX8998_REG_LDO2_LDO3;
205  mask = 0xf;
206  if (ldo == MAX8998_LDO2)
207  shift = 4;
208  else
209  shift = 0;
210  break;
211  case MAX8998_LDO4 ... MAX8998_LDO7:
212  reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
213  break;
214  case MAX8998_LDO8 ... MAX8998_LDO9:
215  reg = MAX8998_REG_LDO8_LDO9;
216  mask = 0xf;
217  if (ldo == MAX8998_LDO8)
218  shift = 4;
219  else
220  shift = 0;
221  break;
222  case MAX8998_LDO10 ... MAX8998_LDO11:
223  reg = MAX8998_REG_LDO10_LDO11;
224  if (ldo == MAX8998_LDO10) {
225  shift = 5;
226  mask = 0x7;
227  } else {
228  shift = 0;
229  mask = 0x1f;
230  }
231  break;
232  case MAX8998_LDO12 ... MAX8998_LDO17:
233  reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
234  break;
235  case MAX8998_BUCK1:
236  reg = MAX8998_REG_BUCK1_VOLTAGE1 + max8998->buck1_idx;
237  break;
238  case MAX8998_BUCK2:
239  reg = MAX8998_REG_BUCK2_VOLTAGE1 + max8998->buck2_idx;
240  break;
241  case MAX8998_BUCK3:
242  reg = MAX8998_REG_BUCK3;
243  break;
244  case MAX8998_BUCK4:
245  reg = MAX8998_REG_BUCK4;
246  break;
247  default:
248  return -EINVAL;
249  }
250 
251  *_reg = reg;
252  *_shift = shift;
253  *_mask = mask;
254 
255  return 0;
256 }
257 
258 static int max8998_get_voltage_sel(struct regulator_dev *rdev)
259 {
260  struct max8998_data *max8998 = rdev_get_drvdata(rdev);
261  struct i2c_client *i2c = max8998->iodev->i2c;
262  int reg, shift = 0, mask, ret;
263  u8 val;
264 
265  ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
266  if (ret)
267  return ret;
268 
269  ret = max8998_read_reg(i2c, reg, &val);
270  if (ret)
271  return ret;
272 
273  val >>= shift;
274  val &= mask;
275 
276  return val;
277 }
278 
279 static int max8998_set_voltage_ldo_sel(struct regulator_dev *rdev,
280  unsigned selector)
281 {
282  struct max8998_data *max8998 = rdev_get_drvdata(rdev);
283  struct i2c_client *i2c = max8998->iodev->i2c;
284  int reg, shift = 0, mask, ret;
285 
286  ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
287  if (ret)
288  return ret;
289 
290  ret = max8998_update_reg(i2c, reg, selector<<shift, mask<<shift);
291 
292  return ret;
293 }
294 
295 static inline void buck1_gpio_set(int gpio1, int gpio2, int v)
296 {
297  gpio_set_value(gpio1, v & 0x1);
298  gpio_set_value(gpio2, (v >> 1) & 0x1);
299 }
300 
301 static inline void buck2_gpio_set(int gpio, int v)
302 {
303  gpio_set_value(gpio, v & 0x1);
304 }
305 
306 static int max8998_set_voltage_buck_sel(struct regulator_dev *rdev,
307  unsigned selector)
308 {
309  struct max8998_data *max8998 = rdev_get_drvdata(rdev);
310  struct max8998_platform_data *pdata =
311  dev_get_platdata(max8998->iodev->dev);
312  struct i2c_client *i2c = max8998->iodev->i2c;
313  int buck = rdev_get_id(rdev);
314  int reg, shift = 0, mask, ret;
315  int j, previous_sel;
316  static u8 buck1_last_val;
317 
318  ret = max8998_get_voltage_register(rdev, &reg, &shift, &mask);
319  if (ret)
320  return ret;
321 
322  previous_sel = max8998_get_voltage_sel(rdev);
323 
324  /* Check if voltage needs to be changed */
325  /* if previous_voltage equal new voltage, return */
326  if (previous_sel == selector) {
327  dev_dbg(max8998->dev, "No voltage change, old:%d, new:%d\n",
328  regulator_list_voltage_linear(rdev, previous_sel),
329  regulator_list_voltage_linear(rdev, selector));
330  return ret;
331  }
332 
333  switch (buck) {
334  case MAX8998_BUCK1:
335  dev_dbg(max8998->dev,
336  "BUCK1, selector:%d, buck1_vol1:%d, buck1_vol2:%d\n"
337  "buck1_vol3:%d, buck1_vol4:%d\n",
338  selector, max8998->buck1_vol[0], max8998->buck1_vol[1],
339  max8998->buck1_vol[2], max8998->buck1_vol[3]);
340 
341  if (gpio_is_valid(pdata->buck1_set1) &&
342  gpio_is_valid(pdata->buck1_set2)) {
343 
344  /* check if requested voltage */
345  /* value is already defined */
346  for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
347  if (max8998->buck1_vol[j] == selector) {
348  max8998->buck1_idx = j;
349  buck1_gpio_set(pdata->buck1_set1,
350  pdata->buck1_set2, j);
351  goto buck1_exit;
352  }
353  }
354 
355  if (pdata->buck_voltage_lock)
356  return -EINVAL;
357 
358  /* no predefine regulator found */
359  max8998->buck1_idx = (buck1_last_val % 2) + 2;
360  dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
361  max8998->buck1_idx);
362  max8998->buck1_vol[max8998->buck1_idx] = selector;
363  ret = max8998_get_voltage_register(rdev, &reg,
364  &shift,
365  &mask);
366  ret = max8998_write_reg(i2c, reg, selector);
367  buck1_gpio_set(pdata->buck1_set1,
368  pdata->buck1_set2, max8998->buck1_idx);
369  buck1_last_val++;
370 buck1_exit:
371  dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
372  i2c->name, gpio_get_value(pdata->buck1_set1),
373  gpio_get_value(pdata->buck1_set2));
374  break;
375  } else {
376  ret = max8998_write_reg(i2c, reg, selector);
377  }
378  break;
379 
380  case MAX8998_BUCK2:
381  dev_dbg(max8998->dev,
382  "BUCK2, selector:%d buck2_vol1:%d, buck2_vol2:%d\n",
383  selector, max8998->buck2_vol[0], max8998->buck2_vol[1]);
384  if (gpio_is_valid(pdata->buck2_set3)) {
385 
386  /* check if requested voltage */
387  /* value is already defined */
388  for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
389  if (max8998->buck2_vol[j] == selector) {
390  max8998->buck2_idx = j;
391  buck2_gpio_set(pdata->buck2_set3, j);
392  goto buck2_exit;
393  }
394  }
395 
396  if (pdata->buck_voltage_lock)
397  return -EINVAL;
398 
399  max8998_get_voltage_register(rdev,
400  &reg, &shift, &mask);
401  ret = max8998_write_reg(i2c, reg, selector);
402  max8998->buck2_vol[max8998->buck2_idx] = selector;
403  buck2_gpio_set(pdata->buck2_set3, max8998->buck2_idx);
404 buck2_exit:
405  dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
406  gpio_get_value(pdata->buck2_set3));
407  } else {
408  ret = max8998_write_reg(i2c, reg, selector);
409  }
410  break;
411 
412  case MAX8998_BUCK3:
413  case MAX8998_BUCK4:
414  ret = max8998_update_reg(i2c, reg, selector<<shift,
415  mask<<shift);
416  break;
417  }
418 
419  return ret;
420 }
421 
422 static int max8998_set_voltage_buck_time_sel(struct regulator_dev *rdev,
423  unsigned int old_selector,
424  unsigned int new_selector)
425 {
426  struct max8998_data *max8998 = rdev_get_drvdata(rdev);
427  struct i2c_client *i2c = max8998->iodev->i2c;
428  const struct voltage_map_desc *desc;
429  int buck = rdev_get_id(rdev);
430  u8 val = 0;
431  int difference, ret;
432 
433  if (buck < MAX8998_BUCK1 || buck > MAX8998_BUCK4)
434  return -EINVAL;
435 
436  desc = ldo_voltage_map[buck];
437 
438  /* Voltage stabilization */
439  ret = max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
440  if (ret)
441  return ret;
442 
443  /* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
444  /* MAX8998 has ENRAMP bit implemented, so test it*/
445  if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
446  return 0;
447 
448  difference = (new_selector - old_selector) * desc->step;
449  if (difference > 0)
450  return difference / ((val & 0x0f) + 1);
451 
452  return 0;
453 }
454 
455 static struct regulator_ops max8998_ldo_ops = {
456  .list_voltage = regulator_list_voltage_linear,
457  .map_voltage = regulator_map_voltage_linear,
458  .is_enabled = max8998_ldo_is_enabled,
459  .enable = max8998_ldo_enable,
460  .disable = max8998_ldo_disable,
461  .get_voltage_sel = max8998_get_voltage_sel,
462  .set_voltage_sel = max8998_set_voltage_ldo_sel,
463 };
464 
465 static struct regulator_ops max8998_buck_ops = {
466  .list_voltage = regulator_list_voltage_linear,
467  .map_voltage = regulator_map_voltage_linear,
468  .is_enabled = max8998_ldo_is_enabled,
469  .enable = max8998_ldo_enable,
470  .disable = max8998_ldo_disable,
471  .get_voltage_sel = max8998_get_voltage_sel,
472  .set_voltage_sel = max8998_set_voltage_buck_sel,
473  .set_voltage_time_sel = max8998_set_voltage_buck_time_sel,
474 };
475 
476 static struct regulator_ops max8998_others_ops = {
477  .is_enabled = max8998_ldo_is_enabled,
478  .enable = max8998_ldo_enable,
479  .disable = max8998_ldo_disable,
480 };
481 
482 static struct regulator_desc regulators[] = {
483  {
484  .name = "LDO2",
485  .id = MAX8998_LDO2,
486  .ops = &max8998_ldo_ops,
487  .type = REGULATOR_VOLTAGE,
488  .owner = THIS_MODULE,
489  }, {
490  .name = "LDO3",
491  .id = MAX8998_LDO3,
492  .ops = &max8998_ldo_ops,
493  .type = REGULATOR_VOLTAGE,
494  .owner = THIS_MODULE,
495  }, {
496  .name = "LDO4",
497  .id = MAX8998_LDO4,
498  .ops = &max8998_ldo_ops,
499  .type = REGULATOR_VOLTAGE,
500  .owner = THIS_MODULE,
501  }, {
502  .name = "LDO5",
503  .id = MAX8998_LDO5,
504  .ops = &max8998_ldo_ops,
505  .type = REGULATOR_VOLTAGE,
506  .owner = THIS_MODULE,
507  }, {
508  .name = "LDO6",
509  .id = MAX8998_LDO6,
510  .ops = &max8998_ldo_ops,
511  .type = REGULATOR_VOLTAGE,
512  .owner = THIS_MODULE,
513  }, {
514  .name = "LDO7",
515  .id = MAX8998_LDO7,
516  .ops = &max8998_ldo_ops,
517  .type = REGULATOR_VOLTAGE,
518  .owner = THIS_MODULE,
519  }, {
520  .name = "LDO8",
521  .id = MAX8998_LDO8,
522  .ops = &max8998_ldo_ops,
523  .type = REGULATOR_VOLTAGE,
524  .owner = THIS_MODULE,
525  }, {
526  .name = "LDO9",
527  .id = MAX8998_LDO9,
528  .ops = &max8998_ldo_ops,
529  .type = REGULATOR_VOLTAGE,
530  .owner = THIS_MODULE,
531  }, {
532  .name = "LDO10",
533  .id = MAX8998_LDO10,
534  .ops = &max8998_ldo_ops,
535  .type = REGULATOR_VOLTAGE,
536  .owner = THIS_MODULE,
537  }, {
538  .name = "LDO11",
539  .id = MAX8998_LDO11,
540  .ops = &max8998_ldo_ops,
541  .type = REGULATOR_VOLTAGE,
542  .owner = THIS_MODULE,
543  }, {
544  .name = "LDO12",
545  .id = MAX8998_LDO12,
546  .ops = &max8998_ldo_ops,
547  .type = REGULATOR_VOLTAGE,
548  .owner = THIS_MODULE,
549  }, {
550  .name = "LDO13",
551  .id = MAX8998_LDO13,
552  .ops = &max8998_ldo_ops,
553  .type = REGULATOR_VOLTAGE,
554  .owner = THIS_MODULE,
555  }, {
556  .name = "LDO14",
557  .id = MAX8998_LDO14,
558  .ops = &max8998_ldo_ops,
559  .type = REGULATOR_VOLTAGE,
560  .owner = THIS_MODULE,
561  }, {
562  .name = "LDO15",
563  .id = MAX8998_LDO15,
564  .ops = &max8998_ldo_ops,
565  .type = REGULATOR_VOLTAGE,
566  .owner = THIS_MODULE,
567  }, {
568  .name = "LDO16",
569  .id = MAX8998_LDO16,
570  .ops = &max8998_ldo_ops,
571  .type = REGULATOR_VOLTAGE,
572  .owner = THIS_MODULE,
573  }, {
574  .name = "LDO17",
575  .id = MAX8998_LDO17,
576  .ops = &max8998_ldo_ops,
577  .type = REGULATOR_VOLTAGE,
578  .owner = THIS_MODULE,
579  }, {
580  .name = "BUCK1",
581  .id = MAX8998_BUCK1,
582  .ops = &max8998_buck_ops,
583  .type = REGULATOR_VOLTAGE,
584  .owner = THIS_MODULE,
585  }, {
586  .name = "BUCK2",
587  .id = MAX8998_BUCK2,
588  .ops = &max8998_buck_ops,
589  .type = REGULATOR_VOLTAGE,
590  .owner = THIS_MODULE,
591  }, {
592  .name = "BUCK3",
593  .id = MAX8998_BUCK3,
594  .ops = &max8998_buck_ops,
595  .type = REGULATOR_VOLTAGE,
596  .owner = THIS_MODULE,
597  }, {
598  .name = "BUCK4",
599  .id = MAX8998_BUCK4,
600  .ops = &max8998_buck_ops,
601  .type = REGULATOR_VOLTAGE,
602  .owner = THIS_MODULE,
603  }, {
604  .name = "EN32KHz AP",
605  .id = MAX8998_EN32KHZ_AP,
606  .ops = &max8998_others_ops,
607  .type = REGULATOR_VOLTAGE,
608  .owner = THIS_MODULE,
609  }, {
610  .name = "EN32KHz CP",
611  .id = MAX8998_EN32KHZ_CP,
612  .ops = &max8998_others_ops,
613  .type = REGULATOR_VOLTAGE,
614  .owner = THIS_MODULE,
615  }, {
616  .name = "ENVICHG",
617  .id = MAX8998_ENVICHG,
618  .ops = &max8998_others_ops,
619  .type = REGULATOR_VOLTAGE,
620  .owner = THIS_MODULE,
621  }, {
622  .name = "ESAFEOUT1",
623  .id = MAX8998_ESAFEOUT1,
624  .ops = &max8998_others_ops,
625  .type = REGULATOR_VOLTAGE,
626  .owner = THIS_MODULE,
627  }, {
628  .name = "ESAFEOUT2",
629  .id = MAX8998_ESAFEOUT2,
630  .ops = &max8998_others_ops,
631  .type = REGULATOR_VOLTAGE,
632  .owner = THIS_MODULE,
633  }
634 };
635 
636 static __devinit int max8998_pmic_probe(struct platform_device *pdev)
637 {
638  struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
639  struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
640  struct regulator_config config = { };
641  struct regulator_dev **rdev;
642  struct max8998_data *max8998;
643  struct i2c_client *i2c;
644  int i, ret, size;
645 
646  if (!pdata) {
647  dev_err(pdev->dev.parent, "No platform init data supplied\n");
648  return -ENODEV;
649  }
650 
651  max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_data),
652  GFP_KERNEL);
653  if (!max8998)
654  return -ENOMEM;
655 
656  size = sizeof(struct regulator_dev *) * pdata->num_regulators;
657  max8998->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
658  if (!max8998->rdev)
659  return -ENOMEM;
660 
661  rdev = max8998->rdev;
662  max8998->dev = &pdev->dev;
663  max8998->iodev = iodev;
664  max8998->num_regulators = pdata->num_regulators;
665  platform_set_drvdata(pdev, max8998);
666  i2c = max8998->iodev->i2c;
667 
668  max8998->buck1_idx = pdata->buck1_default_idx;
669  max8998->buck2_idx = pdata->buck2_default_idx;
670 
671  /* NOTE: */
672  /* For unused GPIO NOT marked as -1 (thereof equal to 0) WARN_ON */
673  /* will be displayed */
674 
675  /* Check if MAX8998 voltage selection GPIOs are defined */
676  if (gpio_is_valid(pdata->buck1_set1) &&
677  gpio_is_valid(pdata->buck1_set2)) {
678  /* Check if SET1 is not equal to 0 */
679  if (!pdata->buck1_set1) {
680  printk(KERN_ERR "MAX8998 SET1 GPIO defined as 0 !\n");
681  WARN_ON(!pdata->buck1_set1);
682  ret = -EIO;
683  goto err_out;
684  }
685  /* Check if SET2 is not equal to 0 */
686  if (!pdata->buck1_set2) {
687  printk(KERN_ERR "MAX8998 SET2 GPIO defined as 0 !\n");
688  WARN_ON(!pdata->buck1_set2);
689  ret = -EIO;
690  goto err_out;
691  }
692 
693  gpio_request(pdata->buck1_set1, "MAX8998 BUCK1_SET1");
694  gpio_direction_output(pdata->buck1_set1,
695  max8998->buck1_idx & 0x1);
696 
697 
698  gpio_request(pdata->buck1_set2, "MAX8998 BUCK1_SET2");
699  gpio_direction_output(pdata->buck1_set2,
700  (max8998->buck1_idx >> 1) & 0x1);
701  /* Set predefined value for BUCK1 register 1 */
702  i = 0;
703  while (buck12_voltage_map_desc.min +
704  buck12_voltage_map_desc.step*i
705  < (pdata->buck1_voltage1 / 1000))
706  i++;
707  max8998->buck1_vol[0] = i;
708  ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE1, i);
709  if (ret)
710  goto err_out;
711 
712  /* Set predefined value for BUCK1 register 2 */
713  i = 0;
714  while (buck12_voltage_map_desc.min +
715  buck12_voltage_map_desc.step*i
716  < (pdata->buck1_voltage2 / 1000))
717  i++;
718 
719  max8998->buck1_vol[1] = i;
720  ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE2, i);
721  if (ret)
722  goto err_out;
723 
724  /* Set predefined value for BUCK1 register 3 */
725  i = 0;
726  while (buck12_voltage_map_desc.min +
727  buck12_voltage_map_desc.step*i
728  < (pdata->buck1_voltage3 / 1000))
729  i++;
730 
731  max8998->buck1_vol[2] = i;
732  ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE3, i);
733  if (ret)
734  goto err_out;
735 
736  /* Set predefined value for BUCK1 register 4 */
737  i = 0;
738  while (buck12_voltage_map_desc.min +
739  buck12_voltage_map_desc.step*i
740  < (pdata->buck1_voltage4 / 1000))
741  i++;
742 
743  max8998->buck1_vol[3] = i;
744  ret = max8998_write_reg(i2c, MAX8998_REG_BUCK1_VOLTAGE4, i);
745  if (ret)
746  goto err_out;
747 
748  }
749 
750  if (gpio_is_valid(pdata->buck2_set3)) {
751  /* Check if SET3 is not equal to 0 */
752  if (!pdata->buck2_set3) {
753  printk(KERN_ERR "MAX8998 SET3 GPIO defined as 0 !\n");
754  WARN_ON(!pdata->buck2_set3);
755  ret = -EIO;
756  goto err_out;
757  }
758  gpio_request(pdata->buck2_set3, "MAX8998 BUCK2_SET3");
759  gpio_direction_output(pdata->buck2_set3,
760  max8998->buck2_idx & 0x1);
761 
762  /* BUCK2 register 1 */
763  i = 0;
764  while (buck12_voltage_map_desc.min +
765  buck12_voltage_map_desc.step*i
766  < (pdata->buck2_voltage1 / 1000))
767  i++;
768  max8998->buck2_vol[0] = i;
769  ret = max8998_write_reg(i2c, MAX8998_REG_BUCK2_VOLTAGE1, i);
770  if (ret)
771  goto err_out;
772 
773  /* BUCK2 register 2 */
774  i = 0;
775  while (buck12_voltage_map_desc.min +
776  buck12_voltage_map_desc.step*i
777  < (pdata->buck2_voltage2 / 1000))
778  i++;
779  max8998->buck2_vol[1] = i;
780  ret = max8998_write_reg(i2c, MAX8998_REG_BUCK2_VOLTAGE2, i);
781  if (ret)
782  goto err_out;
783  }
784 
785  for (i = 0; i < pdata->num_regulators; i++) {
786  const struct voltage_map_desc *desc;
787  int id = pdata->regulators[i].id;
788  int index = id - MAX8998_LDO2;
789 
790  desc = ldo_voltage_map[id];
791  if (desc && regulators[index].ops != &max8998_others_ops) {
792  int count = (desc->max - desc->min) / desc->step + 1;
793 
794  regulators[index].n_voltages = count;
795  regulators[index].min_uV = desc->min * 1000;
796  regulators[index].uV_step = desc->step * 1000;
797  }
798 
799  config.dev = max8998->dev;
800  config.init_data = pdata->regulators[i].initdata;
801  config.driver_data = max8998;
802 
803  rdev[i] = regulator_register(&regulators[index], &config);
804  if (IS_ERR(rdev[i])) {
805  ret = PTR_ERR(rdev[i]);
806  dev_err(max8998->dev, "regulator init failed\n");
807  rdev[i] = NULL;
808  goto err;
809  }
810  }
811 
812 
813  return 0;
814 err:
815  while (--i >= 0)
816  regulator_unregister(rdev[i]);
817 err_out:
818  return ret;
819 }
820 
821 static int __devexit max8998_pmic_remove(struct platform_device *pdev)
822 {
823  struct max8998_data *max8998 = platform_get_drvdata(pdev);
824  struct regulator_dev **rdev = max8998->rdev;
825  int i;
826 
827  for (i = 0; i < max8998->num_regulators; i++)
828  regulator_unregister(rdev[i]);
829  return 0;
830 }
831 
832 static const struct platform_device_id max8998_pmic_id[] = {
833  { "max8998-pmic", TYPE_MAX8998 },
834  { "lp3974-pmic", TYPE_LP3974 },
835  { }
836 };
837 MODULE_DEVICE_TABLE(platform, max8998_pmic_id);
838 
839 static struct platform_driver max8998_pmic_driver = {
840  .driver = {
841  .name = "max8998-pmic",
842  .owner = THIS_MODULE,
843  },
844  .probe = max8998_pmic_probe,
845  .remove = __devexit_p(max8998_pmic_remove),
846  .id_table = max8998_pmic_id,
847 };
848 
849 static int __init max8998_pmic_init(void)
850 {
851  return platform_driver_register(&max8998_pmic_driver);
852 }
853 subsys_initcall(max8998_pmic_init);
854 
855 static void __exit max8998_pmic_cleanup(void)
856 {
857  platform_driver_unregister(&max8998_pmic_driver);
858 }
859 module_exit(max8998_pmic_cleanup);
860 
861 MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
862 MODULE_AUTHOR("Kyungmin Park <[email protected]>");
863 MODULE_LICENSE("GPL");
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