Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
max8997.c
Go to the documentation of this file.
1 /*
2  * max8997.c - Regulator driver for the Maxim 8997/8966
3  *
4  * Copyright (C) 2011 Samsung Electronics
5  * MyungJoo Ham <[email protected]>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  *
21  * This driver is based on max8998.c
22  */
23 
24 #include <linux/bug.h>
25 #include <linux/err.h>
26 #include <linux/gpio.h>
27 #include <linux/slab.h>
28 #include <linux/module.h>
29 #include <linux/platform_device.h>
30 #include <linux/regulator/driver.h>
31 #include <linux/regulator/machine.h>
32 #include <linux/mfd/max8997.h>
33 #include <linux/mfd/max8997-private.h>
34 
35 struct max8997_data {
36  struct device *dev;
37  struct max8997_dev *iodev;
38  int num_regulators;
39  struct regulator_dev **rdev;
40  int ramp_delay; /* in mV/us */
41 
42  bool buck1_gpiodvs;
43  bool buck2_gpiodvs;
44  bool buck5_gpiodvs;
45  u8 buck1_vol[8];
46  u8 buck2_vol[8];
47  u8 buck5_vol[8];
48  int buck125_gpios[3];
49  int buck125_gpioindex;
50  bool ignore_gpiodvs_side_effect;
51 
52  u8 saved_states[MAX8997_REG_MAX];
53 };
54 
55 static inline void max8997_set_gpio(struct max8997_data *max8997)
56 {
57  int set3 = (max8997->buck125_gpioindex) & 0x1;
58  int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
59  int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;
60 
61  gpio_set_value(max8997->buck125_gpios[0], set1);
62  gpio_set_value(max8997->buck125_gpios[1], set2);
63  gpio_set_value(max8997->buck125_gpios[2], set3);
64 }
65 
66 struct voltage_map_desc {
67  int min;
68  int max;
69  int step;
70 };
71 
72 /* Voltage maps in mV */
73 static const struct voltage_map_desc ldo_voltage_map_desc = {
74  .min = 800, .max = 3950, .step = 50,
75 }; /* LDO1 ~ 18, 21 all */
76 
77 static const struct voltage_map_desc buck1245_voltage_map_desc = {
78  .min = 650, .max = 2225, .step = 25,
79 }; /* Buck1, 2, 4, 5 */
80 
81 static const struct voltage_map_desc buck37_voltage_map_desc = {
82  .min = 750, .max = 3900, .step = 50,
83 }; /* Buck3, 7 */
84 
85 /* current map in mA */
86 static const struct voltage_map_desc charger_current_map_desc = {
87  .min = 200, .max = 950, .step = 50,
88 };
89 
90 static const struct voltage_map_desc topoff_current_map_desc = {
91  .min = 50, .max = 200, .step = 10,
92 };
93 
94 static const struct voltage_map_desc *reg_voltage_map[] = {
95  [MAX8997_LDO1] = &ldo_voltage_map_desc,
96  [MAX8997_LDO2] = &ldo_voltage_map_desc,
97  [MAX8997_LDO3] = &ldo_voltage_map_desc,
98  [MAX8997_LDO4] = &ldo_voltage_map_desc,
99  [MAX8997_LDO5] = &ldo_voltage_map_desc,
100  [MAX8997_LDO6] = &ldo_voltage_map_desc,
101  [MAX8997_LDO7] = &ldo_voltage_map_desc,
102  [MAX8997_LDO8] = &ldo_voltage_map_desc,
103  [MAX8997_LDO9] = &ldo_voltage_map_desc,
104  [MAX8997_LDO10] = &ldo_voltage_map_desc,
105  [MAX8997_LDO11] = &ldo_voltage_map_desc,
106  [MAX8997_LDO12] = &ldo_voltage_map_desc,
107  [MAX8997_LDO13] = &ldo_voltage_map_desc,
108  [MAX8997_LDO14] = &ldo_voltage_map_desc,
109  [MAX8997_LDO15] = &ldo_voltage_map_desc,
110  [MAX8997_LDO16] = &ldo_voltage_map_desc,
111  [MAX8997_LDO17] = &ldo_voltage_map_desc,
112  [MAX8997_LDO18] = &ldo_voltage_map_desc,
113  [MAX8997_LDO21] = &ldo_voltage_map_desc,
114  [MAX8997_BUCK1] = &buck1245_voltage_map_desc,
115  [MAX8997_BUCK2] = &buck1245_voltage_map_desc,
116  [MAX8997_BUCK3] = &buck37_voltage_map_desc,
117  [MAX8997_BUCK4] = &buck1245_voltage_map_desc,
118  [MAX8997_BUCK5] = &buck1245_voltage_map_desc,
119  [MAX8997_BUCK6] = NULL,
120  [MAX8997_BUCK7] = &buck37_voltage_map_desc,
121  [MAX8997_EN32KHZ_AP] = NULL,
122  [MAX8997_EN32KHZ_CP] = NULL,
123  [MAX8997_ENVICHG] = NULL,
124  [MAX8997_ESAFEOUT1] = NULL,
125  [MAX8997_ESAFEOUT2] = NULL,
126  [MAX8997_CHARGER_CV] = NULL,
127  [MAX8997_CHARGER] = &charger_current_map_desc,
128  [MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc,
129 };
130 
131 static int max8997_list_voltage_safeout(struct regulator_dev *rdev,
132  unsigned int selector)
133 {
134  int rid = rdev_get_id(rdev);
135 
136  if (rid == MAX8997_ESAFEOUT1 || rid == MAX8997_ESAFEOUT2) {
137  switch (selector) {
138  case 0:
139  return 4850000;
140  case 1:
141  return 4900000;
142  case 2:
143  return 4950000;
144  case 3:
145  return 3300000;
146  default:
147  return -EINVAL;
148  }
149  }
150 
151  return -EINVAL;
152 }
153 
154 static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev,
155  unsigned int selector)
156 {
157  int rid = rdev_get_id(rdev);
158 
159  if (rid != MAX8997_CHARGER_CV)
160  goto err;
161 
162  switch (selector) {
163  case 0x00:
164  return 4200000;
165  case 0x01 ... 0x0E:
166  return 4000000 + 20000 * (selector - 0x01);
167  case 0x0F:
168  return 4350000;
169  default:
170  return -EINVAL;
171  }
172 err:
173  return -EINVAL;
174 }
175 
176 static int max8997_list_voltage(struct regulator_dev *rdev,
177  unsigned int selector)
178 {
179  const struct voltage_map_desc *desc;
180  int rid = rdev_get_id(rdev);
181  int val;
182 
183  if (rid >= ARRAY_SIZE(reg_voltage_map) ||
184  rid < 0)
185  return -EINVAL;
186 
187  desc = reg_voltage_map[rid];
188  if (desc == NULL)
189  return -EINVAL;
190 
191  val = desc->min + desc->step * selector;
192  if (val > desc->max)
193  return -EINVAL;
194 
195  return val * 1000;
196 }
197 
198 static int max8997_get_enable_register(struct regulator_dev *rdev,
199  int *reg, int *mask, int *pattern)
200 {
201  int rid = rdev_get_id(rdev);
202 
203  switch (rid) {
204  case MAX8997_LDO1 ... MAX8997_LDO21:
205  *reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
206  *mask = 0xC0;
207  *pattern = 0xC0;
208  break;
209  case MAX8997_BUCK1:
210  *reg = MAX8997_REG_BUCK1CTRL;
211  *mask = 0x01;
212  *pattern = 0x01;
213  break;
214  case MAX8997_BUCK2:
215  *reg = MAX8997_REG_BUCK2CTRL;
216  *mask = 0x01;
217  *pattern = 0x01;
218  break;
219  case MAX8997_BUCK3:
220  *reg = MAX8997_REG_BUCK3CTRL;
221  *mask = 0x01;
222  *pattern = 0x01;
223  break;
224  case MAX8997_BUCK4:
225  *reg = MAX8997_REG_BUCK4CTRL;
226  *mask = 0x01;
227  *pattern = 0x01;
228  break;
229  case MAX8997_BUCK5:
230  *reg = MAX8997_REG_BUCK5CTRL;
231  *mask = 0x01;
232  *pattern = 0x01;
233  break;
234  case MAX8997_BUCK6:
235  *reg = MAX8997_REG_BUCK6CTRL;
236  *mask = 0x01;
237  *pattern = 0x01;
238  break;
239  case MAX8997_BUCK7:
240  *reg = MAX8997_REG_BUCK7CTRL;
241  *mask = 0x01;
242  *pattern = 0x01;
243  break;
244  case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP:
245  *reg = MAX8997_REG_MAINCON1;
246  *mask = 0x01 << (rid - MAX8997_EN32KHZ_AP);
247  *pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP);
248  break;
249  case MAX8997_ENVICHG:
250  *reg = MAX8997_REG_MBCCTRL1;
251  *mask = 0x80;
252  *pattern = 0x80;
253  break;
254  case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
255  *reg = MAX8997_REG_SAFEOUTCTRL;
256  *mask = 0x40 << (rid - MAX8997_ESAFEOUT1);
257  *pattern = 0x40 << (rid - MAX8997_ESAFEOUT1);
258  break;
259  case MAX8997_CHARGER:
260  *reg = MAX8997_REG_MBCCTRL2;
261  *mask = 0x40;
262  *pattern = 0x40;
263  break;
264  default:
265  /* Not controllable or not exists */
266  return -EINVAL;
267  }
268 
269  return 0;
270 }
271 
272 static int max8997_reg_is_enabled(struct regulator_dev *rdev)
273 {
274  struct max8997_data *max8997 = rdev_get_drvdata(rdev);
275  struct i2c_client *i2c = max8997->iodev->i2c;
276  int ret, reg, mask, pattern;
277  u8 val;
278 
279  ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
280  if (ret)
281  return ret;
282 
283  ret = max8997_read_reg(i2c, reg, &val);
284  if (ret)
285  return ret;
286 
287  return (val & mask) == pattern;
288 }
289 
290 static int max8997_reg_enable(struct regulator_dev *rdev)
291 {
292  struct max8997_data *max8997 = rdev_get_drvdata(rdev);
293  struct i2c_client *i2c = max8997->iodev->i2c;
294  int ret, reg, mask, pattern;
295 
296  ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
297  if (ret)
298  return ret;
299 
300  return max8997_update_reg(i2c, reg, pattern, mask);
301 }
302 
303 static int max8997_reg_disable(struct regulator_dev *rdev)
304 {
305  struct max8997_data *max8997 = rdev_get_drvdata(rdev);
306  struct i2c_client *i2c = max8997->iodev->i2c;
307  int ret, reg, mask, pattern;
308 
309  ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
310  if (ret)
311  return ret;
312 
313  return max8997_update_reg(i2c, reg, ~pattern, mask);
314 }
315 
316 static int max8997_get_voltage_register(struct regulator_dev *rdev,
317  int *_reg, int *_shift, int *_mask)
318 {
319  struct max8997_data *max8997 = rdev_get_drvdata(rdev);
320  int rid = rdev_get_id(rdev);
321  int reg, shift = 0, mask = 0x3f;
322 
323  switch (rid) {
324  case MAX8997_LDO1 ... MAX8997_LDO21:
325  reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
326  break;
327  case MAX8997_BUCK1:
328  reg = MAX8997_REG_BUCK1DVS1;
329  if (max8997->buck1_gpiodvs)
330  reg += max8997->buck125_gpioindex;
331  break;
332  case MAX8997_BUCK2:
333  reg = MAX8997_REG_BUCK2DVS1;
334  if (max8997->buck2_gpiodvs)
335  reg += max8997->buck125_gpioindex;
336  break;
337  case MAX8997_BUCK3:
338  reg = MAX8997_REG_BUCK3DVS;
339  break;
340  case MAX8997_BUCK4:
341  reg = MAX8997_REG_BUCK4DVS;
342  break;
343  case MAX8997_BUCK5:
344  reg = MAX8997_REG_BUCK5DVS1;
345  if (max8997->buck5_gpiodvs)
346  reg += max8997->buck125_gpioindex;
347  break;
348  case MAX8997_BUCK7:
349  reg = MAX8997_REG_BUCK7DVS;
350  break;
351  case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
352  reg = MAX8997_REG_SAFEOUTCTRL;
353  shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0;
354  mask = 0x3;
355  break;
356  case MAX8997_CHARGER_CV:
357  reg = MAX8997_REG_MBCCTRL3;
358  shift = 0;
359  mask = 0xf;
360  break;
361  case MAX8997_CHARGER:
362  reg = MAX8997_REG_MBCCTRL4;
363  shift = 0;
364  mask = 0xf;
365  break;
366  case MAX8997_CHARGER_TOPOFF:
367  reg = MAX8997_REG_MBCCTRL5;
368  shift = 0;
369  mask = 0xf;
370  break;
371  default:
372  return -EINVAL;
373  }
374 
375  *_reg = reg;
376  *_shift = shift;
377  *_mask = mask;
378 
379  return 0;
380 }
381 
382 static int max8997_get_voltage_sel(struct regulator_dev *rdev)
383 {
384  struct max8997_data *max8997 = rdev_get_drvdata(rdev);
385  struct i2c_client *i2c = max8997->iodev->i2c;
386  int reg, shift, mask, ret;
387  u8 val;
388 
389  ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
390  if (ret)
391  return ret;
392 
393  ret = max8997_read_reg(i2c, reg, &val);
394  if (ret)
395  return ret;
396 
397  val >>= shift;
398  val &= mask;
399 
400  return val;
401 }
402 
403 static inline int max8997_get_voltage_proper_val(
404  const struct voltage_map_desc *desc,
405  int min_vol, int max_vol)
406 {
407  int i;
408 
409  if (desc == NULL)
410  return -EINVAL;
411 
412  if (max_vol < desc->min || min_vol > desc->max)
413  return -EINVAL;
414 
415  if (min_vol < desc->min)
416  min_vol = desc->min;
417 
418  i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
419 
420  if (desc->min + desc->step * i > max_vol)
421  return -EINVAL;
422 
423  return i;
424 }
425 
426 static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev,
427  int min_uV, int max_uV, unsigned *selector)
428 {
429  struct max8997_data *max8997 = rdev_get_drvdata(rdev);
430  struct i2c_client *i2c = max8997->iodev->i2c;
431  int rid = rdev_get_id(rdev);
432  int lb, ub;
433  int reg, shift = 0, mask, ret = 0;
434  u8 val = 0x0;
435 
436  if (rid != MAX8997_CHARGER_CV)
437  return -EINVAL;
438 
439  ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
440  if (ret)
441  return ret;
442 
443  if (max_uV < 4000000 || min_uV > 4350000)
444  return -EINVAL;
445 
446  if (min_uV <= 4000000) {
447  if (max_uV >= 4000000)
448  return -EINVAL;
449  else
450  val = 0x1;
451  } else if (min_uV <= 4200000 && max_uV >= 4200000)
452  val = 0x0;
453  else {
454  lb = (min_uV - 4000001) / 20000 + 2;
455  ub = (max_uV - 4000000) / 20000 + 1;
456 
457  if (lb > ub)
458  return -EINVAL;
459 
460  if (lb < 0xf)
461  val = lb;
462  else {
463  if (ub >= 0xf)
464  val = 0xf;
465  else
466  return -EINVAL;
467  }
468  }
469 
470  *selector = val;
471 
472  ret = max8997_update_reg(i2c, reg, val << shift, mask);
473 
474  return ret;
475 }
476 
477 /*
478  * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
479  * BUCK1, 2, and 5 are available if they are not controlled by gpio
480  */
481 static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
482  int min_uV, int max_uV, unsigned *selector)
483 {
484  struct max8997_data *max8997 = rdev_get_drvdata(rdev);
485  struct i2c_client *i2c = max8997->iodev->i2c;
486  int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
487  const struct voltage_map_desc *desc;
488  int rid = rdev_get_id(rdev);
489  int i, reg, shift, mask, ret;
490 
491  switch (rid) {
492  case MAX8997_LDO1 ... MAX8997_LDO21:
493  break;
494  case MAX8997_BUCK1 ... MAX8997_BUCK5:
495  break;
496  case MAX8997_BUCK6:
497  return -EINVAL;
498  case MAX8997_BUCK7:
499  break;
500  case MAX8997_CHARGER:
501  break;
502  case MAX8997_CHARGER_TOPOFF:
503  break;
504  default:
505  return -EINVAL;
506  }
507 
508  desc = reg_voltage_map[rid];
509 
510  i = max8997_get_voltage_proper_val(desc, min_vol, max_vol);
511  if (i < 0)
512  return i;
513 
514  ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
515  if (ret)
516  return ret;
517 
518  ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
519  *selector = i;
520 
521  return ret;
522 }
523 
524 static int max8997_set_voltage_ldobuck_time_sel(struct regulator_dev *rdev,
525  unsigned int old_selector,
526  unsigned int new_selector)
527 {
528  struct max8997_data *max8997 = rdev_get_drvdata(rdev);
529  int rid = rdev_get_id(rdev);
530  const struct voltage_map_desc *desc = reg_voltage_map[rid];
531 
532  /* Delay is required only if the voltage is increasing */
533  if (old_selector >= new_selector)
534  return 0;
535 
536  /* No need to delay if gpio_dvs_mode */
537  switch (rid) {
538  case MAX8997_BUCK1:
539  if (max8997->buck1_gpiodvs)
540  return 0;
541  break;
542  case MAX8997_BUCK2:
543  if (max8997->buck2_gpiodvs)
544  return 0;
545  break;
546  case MAX8997_BUCK5:
547  if (max8997->buck5_gpiodvs)
548  return 0;
549  break;
550  }
551 
552  switch (rid) {
553  case MAX8997_BUCK1:
554  case MAX8997_BUCK2:
555  case MAX8997_BUCK4:
556  case MAX8997_BUCK5:
557  return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
558  max8997->ramp_delay);
559  }
560 
561  return 0;
562 }
563 
564 /*
565  * Assess the damage on the voltage setting of BUCK1,2,5 by the change.
566  *
567  * When GPIO-DVS mode is used for multiple bucks, changing the voltage value
568  * of one of the bucks may affect that of another buck, which is the side
569  * effect of the change (set_voltage). This function examines the GPIO-DVS
570  * configurations and checks whether such side-effect exists.
571  */
572 static int max8997_assess_side_effect(struct regulator_dev *rdev,
573  u8 new_val, int *best)
574 {
575  struct max8997_data *max8997 = rdev_get_drvdata(rdev);
576  int rid = rdev_get_id(rdev);
577  u8 *buckx_val[3];
578  bool buckx_gpiodvs[3];
579  int side_effect[8];
580  int min_side_effect = INT_MAX;
581  int i;
582 
583  *best = -1;
584 
585  switch (rid) {
586  case MAX8997_BUCK1:
587  rid = 0;
588  break;
589  case MAX8997_BUCK2:
590  rid = 1;
591  break;
592  case MAX8997_BUCK5:
593  rid = 2;
594  break;
595  default:
596  return -EINVAL;
597  }
598 
599  buckx_val[0] = max8997->buck1_vol;
600  buckx_val[1] = max8997->buck2_vol;
601  buckx_val[2] = max8997->buck5_vol;
602  buckx_gpiodvs[0] = max8997->buck1_gpiodvs;
603  buckx_gpiodvs[1] = max8997->buck2_gpiodvs;
604  buckx_gpiodvs[2] = max8997->buck5_gpiodvs;
605 
606  for (i = 0; i < 8; i++) {
607  int others;
608 
609  if (new_val != (buckx_val[rid])[i]) {
610  side_effect[i] = -1;
611  continue;
612  }
613 
614  side_effect[i] = 0;
615  for (others = 0; others < 3; others++) {
616  int diff;
617 
618  if (others == rid)
619  continue;
620  if (buckx_gpiodvs[others] == false)
621  continue; /* Not affected */
622  diff = (buckx_val[others])[i] -
623  (buckx_val[others])[max8997->buck125_gpioindex];
624  if (diff > 0)
625  side_effect[i] += diff;
626  else if (diff < 0)
627  side_effect[i] -= diff;
628  }
629  if (side_effect[i] == 0) {
630  *best = i;
631  return 0; /* NO SIDE EFFECT! Use This! */
632  }
633  if (side_effect[i] < min_side_effect) {
634  min_side_effect = side_effect[i];
635  *best = i;
636  }
637  }
638 
639  if (*best == -1)
640  return -EINVAL;
641 
642  return side_effect[*best];
643 }
644 
645 /*
646  * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
647  * max8997_set_voltage_ldobuck to do the job.
648  */
649 static int max8997_set_voltage_buck(struct regulator_dev *rdev,
650  int min_uV, int max_uV, unsigned *selector)
651 {
652  struct max8997_data *max8997 = rdev_get_drvdata(rdev);
653  int rid = rdev_get_id(rdev);
654  const struct voltage_map_desc *desc;
655  int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
656  bool gpio_dvs_mode = false;
657  int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
658 
659  if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
660  return -EINVAL;
661 
662  switch (rid) {
663  case MAX8997_BUCK1:
664  if (max8997->buck1_gpiodvs)
665  gpio_dvs_mode = true;
666  break;
667  case MAX8997_BUCK2:
668  if (max8997->buck2_gpiodvs)
669  gpio_dvs_mode = true;
670  break;
671  case MAX8997_BUCK5:
672  if (max8997->buck5_gpiodvs)
673  gpio_dvs_mode = true;
674  break;
675  }
676 
677  if (!gpio_dvs_mode)
678  return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV,
679  selector);
680 
681  desc = reg_voltage_map[rid];
682  new_val = max8997_get_voltage_proper_val(desc, min_vol, max_vol);
683  if (new_val < 0)
684  return new_val;
685 
686  tmp_dmg = INT_MAX;
687  tmp_idx = -1;
688  tmp_val = -1;
689  do {
690  damage = max8997_assess_side_effect(rdev, new_val, &new_idx);
691  if (damage == 0)
692  goto out;
693 
694  if (tmp_dmg > damage) {
695  tmp_idx = new_idx;
696  tmp_val = new_val;
697  tmp_dmg = damage;
698  }
699 
700  new_val++;
701  } while (desc->min + desc->step * new_val <= desc->max);
702 
703  new_idx = tmp_idx;
704  new_val = tmp_val;
705 
706  if (max8997->ignore_gpiodvs_side_effect == false)
707  return -EINVAL;
708 
709  dev_warn(&rdev->dev, "MAX8997 GPIO-DVS Side Effect Warning: GPIO SET:"
710  " %d -> %d\n", max8997->buck125_gpioindex, tmp_idx);
711 
712 out:
713  if (new_idx < 0 || new_val < 0)
714  return -EINVAL;
715 
716  max8997->buck125_gpioindex = new_idx;
717  max8997_set_gpio(max8997);
718  *selector = new_val;
719 
720  return 0;
721 }
722 
723 static const int safeoutvolt[] = {
724  3300000,
725  4850000,
726  4900000,
727  4950000,
728 };
729 
730 /* For SAFEOUT1 and SAFEOUT2 */
731 static int max8997_set_voltage_safeout(struct regulator_dev *rdev,
732  int min_uV, int max_uV, unsigned *selector)
733 {
734  struct max8997_data *max8997 = rdev_get_drvdata(rdev);
735  struct i2c_client *i2c = max8997->iodev->i2c;
736  int rid = rdev_get_id(rdev);
737  int reg, shift = 0, mask, ret;
738  int i = 0;
739  u8 val;
740 
741  if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2)
742  return -EINVAL;
743 
744  for (i = 0; i < ARRAY_SIZE(safeoutvolt); i++) {
745  if (min_uV <= safeoutvolt[i] &&
746  max_uV >= safeoutvolt[i])
747  break;
748  }
749 
750  if (i >= ARRAY_SIZE(safeoutvolt))
751  return -EINVAL;
752 
753  if (i == 0)
754  val = 0x3;
755  else
756  val = i - 1;
757 
758  ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
759  if (ret)
760  return ret;
761 
762  ret = max8997_update_reg(i2c, reg, val << shift, mask << shift);
763  *selector = val;
764 
765  return ret;
766 }
767 
768 static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
769 {
770  struct max8997_data *max8997 = rdev_get_drvdata(rdev);
771  struct i2c_client *i2c = max8997->iodev->i2c;
772  int ret, reg, mask, pattern;
773  int rid = rdev_get_id(rdev);
774 
775  ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
776  if (ret)
777  return ret;
778 
779  max8997_read_reg(i2c, reg, &max8997->saved_states[rid]);
780 
781  if (rid == MAX8997_LDO1 ||
782  rid == MAX8997_LDO10 ||
783  rid == MAX8997_LDO21) {
784  dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n",
785  rdev->desc->name);
786  return max8997_update_reg(i2c, reg, 0x40, mask);
787  }
788 
789  dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
790  rdev->desc->name, max8997->saved_states[rid] & mask,
791  (~pattern) & mask);
792  return max8997_update_reg(i2c, reg, ~pattern, mask);
793 }
794 
795 static struct regulator_ops max8997_ldo_ops = {
796  .list_voltage = max8997_list_voltage,
797  .is_enabled = max8997_reg_is_enabled,
798  .enable = max8997_reg_enable,
799  .disable = max8997_reg_disable,
800  .get_voltage_sel = max8997_get_voltage_sel,
801  .set_voltage = max8997_set_voltage_ldobuck,
802  .set_voltage_time_sel = max8997_set_voltage_ldobuck_time_sel,
803  .set_suspend_disable = max8997_reg_disable_suspend,
804 };
805 
806 static struct regulator_ops max8997_buck_ops = {
807  .list_voltage = max8997_list_voltage,
808  .is_enabled = max8997_reg_is_enabled,
809  .enable = max8997_reg_enable,
810  .disable = max8997_reg_disable,
811  .get_voltage_sel = max8997_get_voltage_sel,
812  .set_voltage = max8997_set_voltage_buck,
813  .set_voltage_time_sel = max8997_set_voltage_ldobuck_time_sel,
814  .set_suspend_disable = max8997_reg_disable_suspend,
815 };
816 
817 static struct regulator_ops max8997_fixedvolt_ops = {
818  .list_voltage = max8997_list_voltage,
819  .is_enabled = max8997_reg_is_enabled,
820  .enable = max8997_reg_enable,
821  .disable = max8997_reg_disable,
822  .set_suspend_disable = max8997_reg_disable_suspend,
823 };
824 
825 static struct regulator_ops max8997_safeout_ops = {
826  .list_voltage = max8997_list_voltage_safeout,
827  .is_enabled = max8997_reg_is_enabled,
828  .enable = max8997_reg_enable,
829  .disable = max8997_reg_disable,
830  .get_voltage_sel = max8997_get_voltage_sel,
831  .set_voltage = max8997_set_voltage_safeout,
832  .set_suspend_disable = max8997_reg_disable_suspend,
833 };
834 
835 static struct regulator_ops max8997_fixedstate_ops = {
836  .list_voltage = max8997_list_voltage_charger_cv,
837  .get_voltage_sel = max8997_get_voltage_sel,
838  .set_voltage = max8997_set_voltage_charger_cv,
839 };
840 
841 static int max8997_set_current_limit(struct regulator_dev *rdev,
842  int min_uA, int max_uA)
843 {
844  unsigned dummy;
845  int rid = rdev_get_id(rdev);
846 
847  if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
848  return -EINVAL;
849 
850  /* Reuse max8997_set_voltage_ldobuck to set current_limit. */
851  return max8997_set_voltage_ldobuck(rdev, min_uA, max_uA, &dummy);
852 }
853 
854 static int max8997_get_current_limit(struct regulator_dev *rdev)
855 {
856  int sel, rid = rdev_get_id(rdev);
857 
858  if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
859  return -EINVAL;
860 
861  sel = max8997_get_voltage_sel(rdev);
862  if (sel < 0)
863  return sel;
864 
865  /* Reuse max8997_list_voltage to get current_limit. */
866  return max8997_list_voltage(rdev, sel);
867 }
868 
869 static struct regulator_ops max8997_charger_ops = {
870  .is_enabled = max8997_reg_is_enabled,
871  .enable = max8997_reg_enable,
872  .disable = max8997_reg_disable,
873  .get_current_limit = max8997_get_current_limit,
874  .set_current_limit = max8997_set_current_limit,
875 };
876 
877 static struct regulator_ops max8997_charger_fixedstate_ops = {
878  .get_current_limit = max8997_get_current_limit,
879  .set_current_limit = max8997_set_current_limit,
880 };
881 
882 #define MAX8997_VOLTAGE_REGULATOR(_name, _ops) {\
883  .name = #_name, \
884  .id = MAX8997_##_name, \
885  .ops = &_ops, \
886  .type = REGULATOR_VOLTAGE, \
887  .owner = THIS_MODULE, \
888 }
889 
890 #define MAX8997_CURRENT_REGULATOR(_name, _ops) {\
891  .name = #_name, \
892  .id = MAX8997_##_name, \
893  .ops = &_ops, \
894  .type = REGULATOR_CURRENT, \
895  .owner = THIS_MODULE, \
896 }
897 
898 static struct regulator_desc regulators[] = {
899  MAX8997_VOLTAGE_REGULATOR(LDO1, max8997_ldo_ops),
900  MAX8997_VOLTAGE_REGULATOR(LDO2, max8997_ldo_ops),
901  MAX8997_VOLTAGE_REGULATOR(LDO3, max8997_ldo_ops),
902  MAX8997_VOLTAGE_REGULATOR(LDO4, max8997_ldo_ops),
903  MAX8997_VOLTAGE_REGULATOR(LDO5, max8997_ldo_ops),
904  MAX8997_VOLTAGE_REGULATOR(LDO6, max8997_ldo_ops),
905  MAX8997_VOLTAGE_REGULATOR(LDO7, max8997_ldo_ops),
906  MAX8997_VOLTAGE_REGULATOR(LDO8, max8997_ldo_ops),
907  MAX8997_VOLTAGE_REGULATOR(LDO9, max8997_ldo_ops),
908  MAX8997_VOLTAGE_REGULATOR(LDO10, max8997_ldo_ops),
909  MAX8997_VOLTAGE_REGULATOR(LDO11, max8997_ldo_ops),
910  MAX8997_VOLTAGE_REGULATOR(LDO12, max8997_ldo_ops),
911  MAX8997_VOLTAGE_REGULATOR(LDO13, max8997_ldo_ops),
912  MAX8997_VOLTAGE_REGULATOR(LDO14, max8997_ldo_ops),
913  MAX8997_VOLTAGE_REGULATOR(LDO15, max8997_ldo_ops),
914  MAX8997_VOLTAGE_REGULATOR(LDO16, max8997_ldo_ops),
915  MAX8997_VOLTAGE_REGULATOR(LDO17, max8997_ldo_ops),
916  MAX8997_VOLTAGE_REGULATOR(LDO18, max8997_ldo_ops),
917  MAX8997_VOLTAGE_REGULATOR(LDO21, max8997_ldo_ops),
918  MAX8997_VOLTAGE_REGULATOR(BUCK1, max8997_buck_ops),
919  MAX8997_VOLTAGE_REGULATOR(BUCK2, max8997_buck_ops),
920  MAX8997_VOLTAGE_REGULATOR(BUCK3, max8997_buck_ops),
921  MAX8997_VOLTAGE_REGULATOR(BUCK4, max8997_buck_ops),
922  MAX8997_VOLTAGE_REGULATOR(BUCK5, max8997_buck_ops),
923  MAX8997_VOLTAGE_REGULATOR(BUCK6, max8997_fixedvolt_ops),
924  MAX8997_VOLTAGE_REGULATOR(BUCK7, max8997_buck_ops),
925  MAX8997_VOLTAGE_REGULATOR(EN32KHZ_AP, max8997_fixedvolt_ops),
926  MAX8997_VOLTAGE_REGULATOR(EN32KHZ_CP, max8997_fixedvolt_ops),
927  MAX8997_VOLTAGE_REGULATOR(ENVICHG, max8997_fixedvolt_ops),
928  MAX8997_VOLTAGE_REGULATOR(ESAFEOUT1, max8997_safeout_ops),
929  MAX8997_VOLTAGE_REGULATOR(ESAFEOUT2, max8997_safeout_ops),
930  MAX8997_VOLTAGE_REGULATOR(CHARGER_CV, max8997_fixedstate_ops),
931  MAX8997_CURRENT_REGULATOR(CHARGER, max8997_charger_ops),
932  MAX8997_CURRENT_REGULATOR(CHARGER_TOPOFF,
933  max8997_charger_fixedstate_ops),
934 };
935 
936 static __devinit int max8997_pmic_probe(struct platform_device *pdev)
937 {
938  struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
939  struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
940  struct regulator_config config = { };
941  struct regulator_dev **rdev;
942  struct max8997_data *max8997;
943  struct i2c_client *i2c;
944  int i, ret, size;
945  u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
946 
947  if (!pdata) {
948  dev_err(pdev->dev.parent, "No platform init data supplied.\n");
949  return -ENODEV;
950  }
951 
952  max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
953  GFP_KERNEL);
954  if (!max8997)
955  return -ENOMEM;
956 
957  size = sizeof(struct regulator_dev *) * pdata->num_regulators;
958  max8997->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
959  if (!max8997->rdev)
960  return -ENOMEM;
961 
962  rdev = max8997->rdev;
963  max8997->dev = &pdev->dev;
964  max8997->iodev = iodev;
965  max8997->num_regulators = pdata->num_regulators;
966  platform_set_drvdata(pdev, max8997);
967  i2c = max8997->iodev->i2c;
968 
969  max8997->buck125_gpioindex = pdata->buck125_default_idx;
970  max8997->buck1_gpiodvs = pdata->buck1_gpiodvs;
971  max8997->buck2_gpiodvs = pdata->buck2_gpiodvs;
972  max8997->buck5_gpiodvs = pdata->buck5_gpiodvs;
973  memcpy(max8997->buck125_gpios, pdata->buck125_gpios, sizeof(int) * 3);
974  max8997->ignore_gpiodvs_side_effect = pdata->ignore_gpiodvs_side_effect;
975 
976  for (i = 0; i < 8; i++) {
977  max8997->buck1_vol[i] = ret =
978  max8997_get_voltage_proper_val(
979  &buck1245_voltage_map_desc,
980  pdata->buck1_voltage[i] / 1000,
981  pdata->buck1_voltage[i] / 1000 +
982  buck1245_voltage_map_desc.step);
983  if (ret < 0)
984  goto err_out;
985 
986  max8997->buck2_vol[i] = ret =
987  max8997_get_voltage_proper_val(
988  &buck1245_voltage_map_desc,
989  pdata->buck2_voltage[i] / 1000,
990  pdata->buck2_voltage[i] / 1000 +
991  buck1245_voltage_map_desc.step);
992  if (ret < 0)
993  goto err_out;
994 
995  max8997->buck5_vol[i] = ret =
996  max8997_get_voltage_proper_val(
997  &buck1245_voltage_map_desc,
998  pdata->buck5_voltage[i] / 1000,
999  pdata->buck5_voltage[i] / 1000 +
1000  buck1245_voltage_map_desc.step);
1001  if (ret < 0)
1002  goto err_out;
1003 
1004  if (max_buck1 < max8997->buck1_vol[i])
1005  max_buck1 = max8997->buck1_vol[i];
1006  if (max_buck2 < max8997->buck2_vol[i])
1007  max_buck2 = max8997->buck2_vol[i];
1008  if (max_buck5 < max8997->buck5_vol[i])
1009  max_buck5 = max8997->buck5_vol[i];
1010  }
1011 
1012  /* For the safety, set max voltage before setting up */
1013  for (i = 0; i < 8; i++) {
1014  max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1015  max_buck1, 0x3f);
1016  max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1017  max_buck2, 0x3f);
1018  max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1019  max_buck5, 0x3f);
1020  }
1021 
1022  /*
1023  * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them.
1024  * If at least one of them cares, set gpios.
1025  */
1026  if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1027  pdata->buck5_gpiodvs) {
1028 
1029  if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
1030  !gpio_is_valid(pdata->buck125_gpios[1]) ||
1031  !gpio_is_valid(pdata->buck125_gpios[2])) {
1032  dev_err(&pdev->dev, "GPIO NOT VALID\n");
1033  ret = -EINVAL;
1034  goto err_out;
1035  }
1036 
1037  ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[0],
1038  "MAX8997 SET1");
1039  if (ret)
1040  goto err_out;
1041 
1042  ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[1],
1043  "MAX8997 SET2");
1044  if (ret)
1045  goto err_out;
1046 
1047  ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[2],
1048  "MAX8997 SET3");
1049  if (ret)
1050  goto err_out;
1051 
1052  gpio_direction_output(pdata->buck125_gpios[0],
1053  (max8997->buck125_gpioindex >> 2)
1054  & 0x1); /* SET1 */
1055  gpio_direction_output(pdata->buck125_gpios[1],
1056  (max8997->buck125_gpioindex >> 1)
1057  & 0x1); /* SET2 */
1058  gpio_direction_output(pdata->buck125_gpios[2],
1059  (max8997->buck125_gpioindex >> 0)
1060  & 0x1); /* SET3 */
1061  }
1062 
1063  /* DVS-GPIO disabled */
1064  max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ?
1065  (1 << 1) : (0 << 1), 1 << 1);
1066  max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ?
1067  (1 << 1) : (0 << 1), 1 << 1);
1068  max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ?
1069  (1 << 1) : (0 << 1), 1 << 1);
1070 
1071  /* Initialize all the DVS related BUCK registers */
1072  for (i = 0; i < 8; i++) {
1073  max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1074  max8997->buck1_vol[i],
1075  0x3f);
1076  max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1077  max8997->buck2_vol[i],
1078  0x3f);
1079  max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1080  max8997->buck5_vol[i],
1081  0x3f);
1082  }
1083 
1084  /* Misc Settings */
1085  max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
1086  max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
1087 
1088  for (i = 0; i < pdata->num_regulators; i++) {
1089  const struct voltage_map_desc *desc;
1090  int id = pdata->regulators[i].id;
1091 
1092  desc = reg_voltage_map[id];
1093  if (desc)
1094  regulators[id].n_voltages =
1095  (desc->max - desc->min) / desc->step + 1;
1096  else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2)
1097  regulators[id].n_voltages = 4;
1098  else if (id == MAX8997_CHARGER_CV)
1099  regulators[id].n_voltages = 16;
1100 
1101  config.dev = max8997->dev;
1102  config.init_data = pdata->regulators[i].initdata;
1103  config.driver_data = max8997;
1104 
1105  rdev[i] = regulator_register(&regulators[id], &config);
1106  if (IS_ERR(rdev[i])) {
1107  ret = PTR_ERR(rdev[i]);
1108  dev_err(max8997->dev, "regulator init failed for %d\n",
1109  id);
1110  rdev[i] = NULL;
1111  goto err;
1112  }
1113  }
1114 
1115  return 0;
1116 err:
1117  while (--i >= 0)
1118  regulator_unregister(rdev[i]);
1119 err_out:
1120  return ret;
1121 }
1122 
1123 static int __devexit max8997_pmic_remove(struct platform_device *pdev)
1124 {
1125  struct max8997_data *max8997 = platform_get_drvdata(pdev);
1126  struct regulator_dev **rdev = max8997->rdev;
1127  int i;
1128 
1129  for (i = 0; i < max8997->num_regulators; i++)
1130  regulator_unregister(rdev[i]);
1131  return 0;
1132 }
1133 
1134 static const struct platform_device_id max8997_pmic_id[] = {
1135  { "max8997-pmic", 0},
1136  { },
1137 };
1138 MODULE_DEVICE_TABLE(platform, max8997_pmic_id);
1139 
1140 static struct platform_driver max8997_pmic_driver = {
1141  .driver = {
1142  .name = "max8997-pmic",
1143  .owner = THIS_MODULE,
1144  },
1145  .probe = max8997_pmic_probe,
1146  .remove = __devexit_p(max8997_pmic_remove),
1147  .id_table = max8997_pmic_id,
1148 };
1149 
1150 static int __init max8997_pmic_init(void)
1151 {
1152  return platform_driver_register(&max8997_pmic_driver);
1153 }
1154 subsys_initcall(max8997_pmic_init);
1155 
1156 static void __exit max8997_pmic_cleanup(void)
1157 {
1158  platform_driver_unregister(&max8997_pmic_driver);
1159 }
1160 module_exit(max8997_pmic_cleanup);
1161 
1162 MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver");
1163 MODULE_AUTHOR("MyungJoo Ham <[email protected]>");
1164 MODULE_LICENSE("GPL");
Generated on Thu Jan 10 2013 13:53:59 for Linux Kernel by   doxygen 1.8.2