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gpio: move U300 GPIO driver to drivers/gpio
[linux-2.6/libata-dev.git] / drivers / regulator / max8997.c
blob77e0cfb30b23fcc5ff274cf66ac96b94a532a62d
1 /*
2 * max8997.c - Regulator driver for the Maxim 8997/8966
3 *
4 * Copyright (C) 2011 Samsung Electronics
5 * MyungJoo Ham <myungjoo.ham@smasung.com>
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/delay.h>
26 #include <linux/err.h>
27 #include <linux/gpio.h>
28 #include <linux/slab.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 u8 buck1_vol[8];
43 u8 buck2_vol[8];
44 u8 buck5_vol[8];
45 int buck125_gpioindex;
46
47 u8 saved_states[MAX8997_REG_MAX];
48 };
49
50 static inline void max8997_set_gpio(struct max8997_data *max8997)
51 {
52 struct max8997_platform_data *pdata =
53 dev_get_platdata(max8997->iodev->dev);
54 int set3 = (max8997->buck125_gpioindex) & 0x1;
55 int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
56 int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;
57
58 gpio_set_value(pdata->buck125_gpios[0], set1);
59 gpio_set_value(pdata->buck125_gpios[1], set2);
60 gpio_set_value(pdata->buck125_gpios[2], set3);
61 }
62
63 struct voltage_map_desc {
64 int min;
65 int max;
66 int step;
67 unsigned int n_bits;
68 };
69
70 /* Voltage maps in mV */
71 static const struct voltage_map_desc ldo_voltage_map_desc = {
72 .min = 800, .max = 3950, .step = 50, .n_bits = 6,
73 }; /* LDO1 ~ 18, 21 all */
74
75 static const struct voltage_map_desc buck1245_voltage_map_desc = {
76 .min = 650, .max = 2225, .step = 25, .n_bits = 6,
77 }; /* Buck1, 2, 4, 5 */
78
79 static const struct voltage_map_desc buck37_voltage_map_desc = {
80 .min = 750, .max = 3900, .step = 50, .n_bits = 6,
81 }; /* Buck3, 7 */
82
83 /* current map in mA */
84 static const struct voltage_map_desc charger_current_map_desc = {
85 .min = 200, .max = 950, .step = 50, .n_bits = 4,
86 };
87
88 static const struct voltage_map_desc topoff_current_map_desc = {
89 .min = 50, .max = 200, .step = 10, .n_bits = 4,
90 };
91
92 static const struct voltage_map_desc *reg_voltage_map[] = {
93 [MAX8997_LDO1] = &ldo_voltage_map_desc,
94 [MAX8997_LDO2] = &ldo_voltage_map_desc,
95 [MAX8997_LDO3] = &ldo_voltage_map_desc,
96 [MAX8997_LDO4] = &ldo_voltage_map_desc,
97 [MAX8997_LDO5] = &ldo_voltage_map_desc,
98 [MAX8997_LDO6] = &ldo_voltage_map_desc,
99 [MAX8997_LDO7] = &ldo_voltage_map_desc,
100 [MAX8997_LDO8] = &ldo_voltage_map_desc,
101 [MAX8997_LDO9] = &ldo_voltage_map_desc,
102 [MAX8997_LDO10] = &ldo_voltage_map_desc,
103 [MAX8997_LDO11] = &ldo_voltage_map_desc,
104 [MAX8997_LDO12] = &ldo_voltage_map_desc,
105 [MAX8997_LDO13] = &ldo_voltage_map_desc,
106 [MAX8997_LDO14] = &ldo_voltage_map_desc,
107 [MAX8997_LDO15] = &ldo_voltage_map_desc,
108 [MAX8997_LDO16] = &ldo_voltage_map_desc,
109 [MAX8997_LDO17] = &ldo_voltage_map_desc,
110 [MAX8997_LDO18] = &ldo_voltage_map_desc,
111 [MAX8997_LDO21] = &ldo_voltage_map_desc,
112 [MAX8997_BUCK1] = &buck1245_voltage_map_desc,
113 [MAX8997_BUCK2] = &buck1245_voltage_map_desc,
114 [MAX8997_BUCK3] = &buck37_voltage_map_desc,
115 [MAX8997_BUCK4] = &buck1245_voltage_map_desc,
116 [MAX8997_BUCK5] = &buck1245_voltage_map_desc,
117 [MAX8997_BUCK6] = NULL,
118 [MAX8997_BUCK7] = &buck37_voltage_map_desc,
119 [MAX8997_EN32KHZ_AP] = NULL,
120 [MAX8997_EN32KHZ_CP] = NULL,
121 [MAX8997_ENVICHG] = NULL,
122 [MAX8997_ESAFEOUT1] = NULL,
123 [MAX8997_ESAFEOUT2] = NULL,
124 [MAX8997_CHARGER_CV] = NULL,
125 [MAX8997_CHARGER] = &charger_current_map_desc,
126 [MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc,
127 };
128
129 static inline int max8997_get_rid(struct regulator_dev *rdev)
130 {
131 return rdev_get_id(rdev);
132 }
133
134 static int max8997_list_voltage_safeout(struct regulator_dev *rdev,
135 unsigned int selector)
136 {
137 int rid = max8997_get_rid(rdev);
138
139 if (rid == MAX8997_ESAFEOUT1 || rid == MAX8997_ESAFEOUT2) {
140 switch (selector) {
141 case 0:
142 return 4850000;
143 case 1:
144 return 4900000;
145 case 2:
146 return 4950000;
147 case 3:
148 return 3300000;
149 default:
150 return -EINVAL;
151 }
152 }
153
154 return -EINVAL;
155 }
156
157 static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev,
158 unsigned int selector)
159 {
160 int rid = max8997_get_rid(rdev);
161
162 if (rid != MAX8997_CHARGER_CV)
163 goto err;
164
165 switch (selector) {
166 case 0x00:
167 return 4200000;
168 case 0x01 ... 0x0E:
169 return 4000000 + 20000 * (selector - 0x01);
170 case 0x0F:
171 return 4350000;
172 default:
173 return -EINVAL;
174 }
175 err:
176 return -EINVAL;
177 }
178
179 static int max8997_list_voltage(struct regulator_dev *rdev,
180 unsigned int selector)
181 {
182 const struct voltage_map_desc *desc;
183 int rid = max8997_get_rid(rdev);
184 int val;
185
186 if (rid >= ARRAY_SIZE(reg_voltage_map) ||
187 rid < 0)
188 return -EINVAL;
189
190 desc = reg_voltage_map[rid];
191 if (desc == NULL)
192 return -EINVAL;
193
194 val = desc->min + desc->step * selector;
195 if (val > desc->max)
196 return -EINVAL;
197
198 return val * 1000;
199 }
200
201 static int max8997_get_enable_register(struct regulator_dev *rdev,
202 int *reg, int *mask, int *pattern)
203 {
204 int rid = max8997_get_rid(rdev);
205
206 switch (rid) {
207 case MAX8997_LDO1 ... MAX8997_LDO21:
208 *reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
209 *mask = 0xC0;
210 *pattern = 0xC0;
211 break;
212 case MAX8997_BUCK1:
213 *reg = MAX8997_REG_BUCK1CTRL;
214 *mask = 0x01;
215 *pattern = 0x01;
216 break;
217 case MAX8997_BUCK2:
218 *reg = MAX8997_REG_BUCK2CTRL;
219 *mask = 0x01;
220 *pattern = 0x01;
221 break;
222 case MAX8997_BUCK3:
223 *reg = MAX8997_REG_BUCK3CTRL;
224 *mask = 0x01;
225 *pattern = 0x01;
226 break;
227 case MAX8997_BUCK4:
228 *reg = MAX8997_REG_BUCK4CTRL;
229 *mask = 0x01;
230 *pattern = 0x01;
231 break;
232 case MAX8997_BUCK5:
233 *reg = MAX8997_REG_BUCK5CTRL;
234 *mask = 0x01;
235 *pattern = 0x01;
236 break;
237 case MAX8997_BUCK6:
238 *reg = MAX8997_REG_BUCK6CTRL;
239 *mask = 0x01;
240 *pattern = 0x01;
241 break;
242 case MAX8997_BUCK7:
243 *reg = MAX8997_REG_BUCK7CTRL;
244 *mask = 0x01;
245 *pattern = 0x01;
246 break;
247 case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP:
248 *reg = MAX8997_REG_MAINCON1;
249 *mask = 0x01 << (rid - MAX8997_EN32KHZ_AP);
250 *pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP);
251 break;
252 case MAX8997_ENVICHG:
253 *reg = MAX8997_REG_MBCCTRL1;
254 *mask = 0x80;
255 *pattern = 0x80;
256 break;
257 case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
258 *reg = MAX8997_REG_SAFEOUTCTRL;
259 *mask = 0x40 << (rid - MAX8997_ESAFEOUT1);
260 *pattern = 0x40 << (rid - MAX8997_ESAFEOUT1);
261 break;
262 case MAX8997_CHARGER:
263 *reg = MAX8997_REG_MBCCTRL2;
264 *mask = 0x40;
265 *pattern = 0x40;
266 break;
267 default:
268 /* Not controllable or not exists */
269 return -EINVAL;
270 break;
271 }
272
273 return 0;
274 }
275
276 static int max8997_reg_is_enabled(struct regulator_dev *rdev)
277 {
278 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
279 struct i2c_client *i2c = max8997->iodev->i2c;
280 int ret, reg, mask, pattern;
281 u8 val;
282
283 ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
284 if (ret == -EINVAL)
285 return 1; /* "not controllable" */
286 else if (ret)
287 return ret;
288
289 ret = max8997_read_reg(i2c, reg, &val);
290 if (ret)
291 return ret;
292
293 return (val & mask) == pattern;
294 }
295
296 static int max8997_reg_enable(struct regulator_dev *rdev)
297 {
298 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
299 struct i2c_client *i2c = max8997->iodev->i2c;
300 int ret, reg, mask, pattern;
301
302 ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
303 if (ret)
304 return ret;
305
306 return max8997_update_reg(i2c, reg, pattern, mask);
307 }
308
309 static int max8997_reg_disable(struct regulator_dev *rdev)
310 {
311 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
312 struct i2c_client *i2c = max8997->iodev->i2c;
313 int ret, reg, mask, pattern;
314
315 ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
316 if (ret)
317 return ret;
318
319 return max8997_update_reg(i2c, reg, ~pattern, mask);
320 }
321
322 static int max8997_get_voltage_register(struct regulator_dev *rdev,
323 int *_reg, int *_shift, int *_mask)
324 {
325 int rid = max8997_get_rid(rdev);
326 int reg, shift = 0, mask = 0x3f;
327
328 switch (rid) {
329 case MAX8997_LDO1 ... MAX8997_LDO21:
330 reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
331 break;
332 case MAX8997_BUCK1:
333 reg = MAX8997_REG_BUCK1DVS1;
334 break;
335 case MAX8997_BUCK2:
336 reg = MAX8997_REG_BUCK2DVS1;
337 break;
338 case MAX8997_BUCK3:
339 reg = MAX8997_REG_BUCK3DVS;
340 break;
341 case MAX8997_BUCK4:
342 reg = MAX8997_REG_BUCK4DVS;
343 break;
344 case MAX8997_BUCK5:
345 reg = MAX8997_REG_BUCK5DVS1;
346 break;
347 case MAX8997_BUCK7:
348 reg = MAX8997_REG_BUCK7DVS;
349 break;
350 case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
351 reg = MAX8997_REG_SAFEOUTCTRL;
352 shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0;
353 mask = 0x3;
354 break;
355 case MAX8997_CHARGER_CV:
356 reg = MAX8997_REG_MBCCTRL3;
357 shift = 0;
358 mask = 0xf;
359 break;
360 case MAX8997_CHARGER:
361 reg = MAX8997_REG_MBCCTRL4;
362 shift = 0;
363 mask = 0xf;
364 break;
365 case MAX8997_CHARGER_TOPOFF:
366 reg = MAX8997_REG_MBCCTRL5;
367 shift = 0;
368 mask = 0xf;
369 break;
370 default:
371 return -EINVAL;
372 }
373
374 *_reg = reg;
375 *_shift = shift;
376 *_mask = mask;
377
378 return 0;
379 }
380
381 static int max8997_get_voltage(struct regulator_dev *rdev)
382 {
383 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
384 struct max8997_platform_data *pdata =
385 dev_get_platdata(max8997->iodev->dev);
386 struct i2c_client *i2c = max8997->iodev->i2c;
387 int reg, shift, mask, ret;
388 int rid = max8997_get_rid(rdev);
389 u8 val;
390
391 ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
392 if (ret)
393 return ret;
394
395 if ((rid == MAX8997_BUCK1 && pdata->buck1_gpiodvs) ||
396 (rid == MAX8997_BUCK2 && pdata->buck2_gpiodvs) ||
397 (rid == MAX8997_BUCK5 && pdata->buck5_gpiodvs))
398 reg += max8997->buck125_gpioindex;
399
400 ret = max8997_read_reg(i2c, reg, &val);
401 if (ret)
402 return ret;
403
404 val >>= shift;
405 val &= mask;
406
407 if (rdev->desc && rdev->desc->ops && rdev->desc->ops->list_voltage)
408 return rdev->desc->ops->list_voltage(rdev, val);
409
410 /*
411 * max8997_list_voltage returns value for any rdev with voltage_map,
412 * which works for "CHARGER" and "CHARGER TOPOFF" that do not have
413 * list_voltage ops (they are current regulators).
414 */
415 return max8997_list_voltage(rdev, val);
416 }
417
418 static inline int max8997_get_voltage_proper_val(
419 const struct voltage_map_desc *desc,
420 int min_vol, int max_vol)
421 {
422 int i = 0;
423
424 if (desc == NULL)
425 return -EINVAL;
426
427 if (max_vol < desc->min || min_vol > desc->max)
428 return -EINVAL;
429
430 while (desc->min + desc->step * i < min_vol &&
431 desc->min + desc->step * i < desc->max)
432 i++;
433
434 if (desc->min + desc->step * i > max_vol)
435 return -EINVAL;
436
437 if (i >= (1 << desc->n_bits))
438 return -EINVAL;
439
440 return i;
441 }
442
443 static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev,
444 int min_uV, int max_uV, unsigned *selector)
445 {
446 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
447 struct i2c_client *i2c = max8997->iodev->i2c;
448 int rid = max8997_get_rid(rdev);
449 int lb, ub;
450 int reg, shift = 0, mask, ret = 0;
451 u8 val = 0x0;
452
453 if (rid != MAX8997_CHARGER_CV)
454 return -EINVAL;
455
456 ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
457 if (ret)
458 return ret;
459
460 if (max_uV < 4000000 || min_uV > 4350000)
461 return -EINVAL;
462
463 if (min_uV <= 4000000) {
464 if (max_uV >= 4000000)
465 return -EINVAL;
466 else
467 val = 0x1;
468 } else if (min_uV <= 4200000 && max_uV >= 4200000)
469 val = 0x0;
470 else {
471 lb = (min_uV - 4000001) / 20000 + 2;
472 ub = (max_uV - 4000000) / 20000 + 1;
473
474 if (lb > ub)
475 return -EINVAL;
476
477 if (lb < 0xf)
478 val = lb;
479 else {
480 if (ub >= 0xf)
481 val = 0xf;
482 else
483 return -EINVAL;
484 }
485 }
486
487 *selector = val;
488
489 ret = max8997_update_reg(i2c, reg, val << shift, mask);
490
491 return ret;
492 }
493
494 /*
495 * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
496 * BUCK1, 2, and 5 are available if they are not controlled by gpio
497 */
498 static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
499 int min_uV, int max_uV, unsigned *selector)
500 {
501 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
502 struct i2c_client *i2c = max8997->iodev->i2c;
503 int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
504 const struct voltage_map_desc *desc;
505 int rid = max8997_get_rid(rdev);
506 int reg, shift = 0, mask, ret;
507 int i;
508 u8 org;
509
510 switch (rid) {
511 case MAX8997_LDO1 ... MAX8997_LDO21:
512 break;
513 case MAX8997_BUCK1 ... MAX8997_BUCK5:
514 break;
515 case MAX8997_BUCK6:
516 return -EINVAL;
517 case MAX8997_BUCK7:
518 break;
519 case MAX8997_CHARGER:
520 break;
521 case MAX8997_CHARGER_TOPOFF:
522 break;
523 default:
524 return -EINVAL;
525 }
526
527 desc = reg_voltage_map[rid];
528
529 i = max8997_get_voltage_proper_val(desc, min_vol, max_vol);
530 if (i < 0)
531 return i;
532
533 ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
534 if (ret)
535 return ret;
536
537 max8997_read_reg(i2c, reg, &org);
538 org = (org & mask) >> shift;
539
540 ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
541 *selector = i;
542
543 if (rid == MAX8997_BUCK1 || rid == MAX8997_BUCK2 ||
544 rid == MAX8997_BUCK4 || rid == MAX8997_BUCK5) {
545 /* If the voltage is increasing */
546 if (org < i)
547 udelay(desc->step * (i - org) / max8997->ramp_delay);
548 }
549
550 return ret;
551 }
552
553 /*
554 * Assess the damage on the voltage setting of BUCK1,2,5 by the change.
555 *
556 * When GPIO-DVS mode is used for multiple bucks, changing the voltage value
557 * of one of the bucks may affect that of another buck, which is the side
558 * effect of the change (set_voltage). This function examines the GPIO-DVS
559 * configurations and checks whether such side-effect exists.
560 */
561 static int max8997_assess_side_effect(struct regulator_dev *rdev,
562 u8 new_val, int *best)
563 {
564 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
565 struct max8997_platform_data *pdata =
566 dev_get_platdata(max8997->iodev->dev);
567 int rid = max8997_get_rid(rdev);
568 u8 *buckx_val[3];
569 bool buckx_gpiodvs[3];
570 int side_effect[8];
571 int min_side_effect = INT_MAX;
572 int i;
573
574 *best = -1;
575
576 switch (rid) {
577 case MAX8997_BUCK1:
578 rid = 0;
579 break;
580 case MAX8997_BUCK2:
581 rid = 1;
582 break;
583 case MAX8997_BUCK5:
584 rid = 2;
585 break;
586 default:
587 return -EINVAL;
588 }
589
590 buckx_val[0] = max8997->buck1_vol;
591 buckx_val[1] = max8997->buck2_vol;
592 buckx_val[2] = max8997->buck5_vol;
593 buckx_gpiodvs[0] = pdata->buck1_gpiodvs;
594 buckx_gpiodvs[1] = pdata->buck2_gpiodvs;
595 buckx_gpiodvs[2] = pdata->buck5_gpiodvs;
596
597 for (i = 0; i < 8; i++) {
598 int others;
599
600 if (new_val != (buckx_val[rid])[i]) {
601 side_effect[i] = -1;
602 continue;
603 }
604
605 side_effect[i] = 0;
606 for (others = 0; others < 3; others++) {
607 int diff;
608
609 if (others == rid)
610 continue;
611 if (buckx_gpiodvs[others] == false)
612 continue; /* Not affected */
613 diff = (buckx_val[others])[i] -
614 (buckx_val[others])[max8997->buck125_gpioindex];
615 if (diff > 0)
616 side_effect[i] += diff;
617 else if (diff < 0)
618 side_effect[i] -= diff;
619 }
620 if (side_effect[i] == 0) {
621 *best = i;
622 return 0; /* NO SIDE EFFECT! Use This! */
623 }
624 if (side_effect[i] < min_side_effect) {
625 min_side_effect = side_effect[i];
626 *best = i;
627 }
628 }
629
630 if (*best == -1)
631 return -EINVAL;
632
633 return side_effect[*best];
634 }
635
636 /*
637 * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
638 * max8997_set_voltage_ldobuck to do the job.
639 */
640 static int max8997_set_voltage_buck(struct regulator_dev *rdev,
641 int min_uV, int max_uV, unsigned *selector)
642 {
643 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
644 struct max8997_platform_data *pdata =
645 dev_get_platdata(max8997->iodev->dev);
646 int rid = max8997_get_rid(rdev);
647 const struct voltage_map_desc *desc;
648 int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
649 bool gpio_dvs_mode = false;
650 int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
651
652 if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
653 return -EINVAL;
654
655 switch (rid) {
656 case MAX8997_BUCK1:
657 if (pdata->buck1_gpiodvs)
658 gpio_dvs_mode = true;
659 break;
660 case MAX8997_BUCK2:
661 if (pdata->buck2_gpiodvs)
662 gpio_dvs_mode = true;
663 break;
664 case MAX8997_BUCK5:
665 if (pdata->buck5_gpiodvs)
666 gpio_dvs_mode = true;
667 break;
668 }
669
670 if (!gpio_dvs_mode)
671 return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV,
672 selector);
673
674 desc = reg_voltage_map[rid];
675 new_val = max8997_get_voltage_proper_val(desc, min_vol, max_vol);
676 if (new_val < 0)
677 return new_val;
678
679 tmp_dmg = INT_MAX;
680 tmp_idx = -1;
681 tmp_val = -1;
682 do {
683 damage = max8997_assess_side_effect(rdev, new_val, &new_idx);
684 if (damage == 0)
685 goto out;
686
687 if (tmp_dmg > damage) {
688 tmp_idx = new_idx;
689 tmp_val = new_val;
690 tmp_dmg = damage;
691 }
692
693 new_val++;
694 } while (desc->min + desc->step + new_val <= desc->max);
695
696 new_idx = tmp_idx;
697 new_val = tmp_val;
698
699 if (pdata->ignore_gpiodvs_side_effect == false)
700 return -EINVAL;
701
702 dev_warn(&rdev->dev, "MAX8997 GPIO-DVS Side Effect Warning: GPIO SET:"
703 " %d -> %d\n", max8997->buck125_gpioindex, tmp_idx);
704
705 out:
706 if (new_idx < 0 || new_val < 0)
707 return -EINVAL;
708
709 max8997->buck125_gpioindex = new_idx;
710 max8997_set_gpio(max8997);
711 *selector = new_val;
712
713 return 0;
714 }
715
716 static const int safeoutvolt[] = {
717 3300000,
718 4850000,
719 4900000,
720 4950000,
721 };
722
723 /* For SAFEOUT1 and SAFEOUT2 */
724 static int max8997_set_voltage_safeout(struct regulator_dev *rdev,
725 int min_uV, int max_uV, unsigned *selector)
726 {
727 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
728 struct i2c_client *i2c = max8997->iodev->i2c;
729 int rid = max8997_get_rid(rdev);
730 int reg, shift = 0, mask, ret;
731 int i = 0;
732 u8 val;
733
734 if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2)
735 return -EINVAL;
736
737 for (i = 0; i < ARRAY_SIZE(safeoutvolt); i++) {
738 if (min_uV <= safeoutvolt[i] &&
739 max_uV >= safeoutvolt[i])
740 break;
741 }
742
743 if (i >= ARRAY_SIZE(safeoutvolt))
744 return -EINVAL;
745
746 if (i == 0)
747 val = 0x3;
748 else
749 val = i - 1;
750
751 ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
752 if (ret)
753 return ret;
754
755 ret = max8997_update_reg(i2c, reg, val << shift, mask << shift);
756 *selector = val;
757
758 return ret;
759 }
760
761 static int max8997_reg_enable_suspend(struct regulator_dev *rdev)
762 {
763 return 0;
764 }
765
766 static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
767 {
768 struct max8997_data *max8997 = rdev_get_drvdata(rdev);
769 struct i2c_client *i2c = max8997->iodev->i2c;
770 int ret, reg, mask, pattern;
771 int rid = max8997_get_rid(rdev);
772
773 ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
774 if (ret)
775 return ret;
776
777 max8997_read_reg(i2c, reg, &max8997->saved_states[rid]);
778
779 if (rid == MAX8997_LDO1 ||
780 rid == MAX8997_LDO10 ||
781 rid == MAX8997_LDO21) {
782 dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n",
783 rdev->desc->name);
784 return max8997_update_reg(i2c, reg, 0x40, mask);
785 }
786
787 dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
788 rdev->desc->name, max8997->saved_states[rid] & mask,
789 (~pattern) & mask);
790 return max8997_update_reg(i2c, reg, ~pattern, mask);
791 }
792
793 static struct regulator_ops max8997_ldo_ops = {
794 .list_voltage = max8997_list_voltage,
795 .is_enabled = max8997_reg_is_enabled,
796 .enable = max8997_reg_enable,
797 .disable = max8997_reg_disable,
798 .get_voltage = max8997_get_voltage,
799 .set_voltage = max8997_set_voltage_ldobuck,
800 .set_suspend_enable = max8997_reg_enable_suspend,
801 .set_suspend_disable = max8997_reg_disable_suspend,
802 };
803
804 static struct regulator_ops max8997_buck_ops = {
805 .list_voltage = max8997_list_voltage,
806 .is_enabled = max8997_reg_is_enabled,
807 .enable = max8997_reg_enable,
808 .disable = max8997_reg_disable,
809 .get_voltage = max8997_get_voltage,
810 .set_voltage = max8997_set_voltage_buck,
811 .set_suspend_enable = max8997_reg_enable_suspend,
812 .set_suspend_disable = max8997_reg_disable_suspend,
813 };
814
815 static struct regulator_ops max8997_fixedvolt_ops = {
816 .list_voltage = max8997_list_voltage,
817 .is_enabled = max8997_reg_is_enabled,
818 .enable = max8997_reg_enable,
819 .disable = max8997_reg_disable,
820 .set_suspend_enable = max8997_reg_enable_suspend,
821 .set_suspend_disable = max8997_reg_disable_suspend,
822 };
823
824 static struct regulator_ops max8997_safeout_ops = {
825 .list_voltage = max8997_list_voltage_safeout,
826 .is_enabled = max8997_reg_is_enabled,
827 .enable = max8997_reg_enable,
828 .disable = max8997_reg_disable,
829 .get_voltage = max8997_get_voltage,
830 .set_voltage = max8997_set_voltage_safeout,
831 .set_suspend_enable = max8997_reg_enable_suspend,
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 = max8997_get_voltage,
838 .set_voltage = max8997_set_voltage_charger_cv,
839 };
840
841 static int max8997_set_voltage_ldobuck_wrap(struct regulator_dev *rdev,
842 int min_uV, int max_uV)
843 {
844 unsigned dummy;
845
846 return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV, &dummy);
847 }
848
849
850 static struct regulator_ops max8997_charger_ops = {
851 .is_enabled = max8997_reg_is_enabled,
852 .enable = max8997_reg_enable,
853 .disable = max8997_reg_disable,
854 .get_current_limit = max8997_get_voltage,
855 .set_current_limit = max8997_set_voltage_ldobuck_wrap,
856 };
857
858 static struct regulator_ops max8997_charger_fixedstate_ops = {
859 .is_enabled = max8997_reg_is_enabled,
860 .get_current_limit = max8997_get_voltage,
861 .set_current_limit = max8997_set_voltage_ldobuck_wrap,
862 };
863
864 #define regulator_desc_ldo(num) { \
865 .name = "LDO"#num, \
866 .id = MAX8997_LDO##num, \
867 .ops = &max8997_ldo_ops, \
868 .type = REGULATOR_VOLTAGE, \
869 .owner = THIS_MODULE, \
870 }
871 #define regulator_desc_buck(num) { \
872 .name = "BUCK"#num, \
873 .id = MAX8997_BUCK##num, \
874 .ops = &max8997_buck_ops, \
875 .type = REGULATOR_VOLTAGE, \
876 .owner = THIS_MODULE, \
877 }
878
879 static struct regulator_desc regulators[] = {
880 regulator_desc_ldo(1),
881 regulator_desc_ldo(2),
882 regulator_desc_ldo(3),
883 regulator_desc_ldo(4),
884 regulator_desc_ldo(5),
885 regulator_desc_ldo(6),
886 regulator_desc_ldo(7),
887 regulator_desc_ldo(8),
888 regulator_desc_ldo(9),
889 regulator_desc_ldo(10),
890 regulator_desc_ldo(11),
891 regulator_desc_ldo(12),
892 regulator_desc_ldo(13),
893 regulator_desc_ldo(14),
894 regulator_desc_ldo(15),
895 regulator_desc_ldo(16),
896 regulator_desc_ldo(17),
897 regulator_desc_ldo(18),
898 regulator_desc_ldo(21),
899 regulator_desc_buck(1),
900 regulator_desc_buck(2),
901 regulator_desc_buck(3),
902 regulator_desc_buck(4),
903 regulator_desc_buck(5),
904 {
905 .name = "BUCK6",
906 .id = MAX8997_BUCK6,
907 .ops = &max8997_fixedvolt_ops,
908 .type = REGULATOR_VOLTAGE,
909 .owner = THIS_MODULE,
910 },
911 regulator_desc_buck(7),
912 {
913 .name = "EN32KHz AP",
914 .id = MAX8997_EN32KHZ_AP,
915 .ops = &max8997_fixedvolt_ops,
916 .type = REGULATOR_VOLTAGE,
917 .owner = THIS_MODULE,
918 }, {
919 .name = "EN32KHz CP",
920 .id = MAX8997_EN32KHZ_CP,
921 .ops = &max8997_fixedvolt_ops,
922 .type = REGULATOR_VOLTAGE,
923 .owner = THIS_MODULE,
924 }, {
925 .name = "ENVICHG",
926 .id = MAX8997_ENVICHG,
927 .ops = &max8997_fixedvolt_ops,
928 .type = REGULATOR_VOLTAGE,
929 .owner = THIS_MODULE,
930 }, {
931 .name = "ESAFEOUT1",
932 .id = MAX8997_ESAFEOUT1,
933 .ops = &max8997_safeout_ops,
934 .type = REGULATOR_VOLTAGE,
935 .owner = THIS_MODULE,
936 }, {
937 .name = "ESAFEOUT2",
938 .id = MAX8997_ESAFEOUT2,
939 .ops = &max8997_safeout_ops,
940 .type = REGULATOR_VOLTAGE,
941 .owner = THIS_MODULE,
942 }, {
943 .name = "CHARGER CV",
944 .id = MAX8997_CHARGER_CV,
945 .ops = &max8997_fixedstate_ops,
946 .type = REGULATOR_VOLTAGE,
947 .owner = THIS_MODULE,
948 }, {
949 .name = "CHARGER",
950 .id = MAX8997_CHARGER,
951 .ops = &max8997_charger_ops,
952 .type = REGULATOR_CURRENT,
953 .owner = THIS_MODULE,
954 }, {
955 .name = "CHARGER TOPOFF",
956 .id = MAX8997_CHARGER_TOPOFF,
957 .ops = &max8997_charger_fixedstate_ops,
958 .type = REGULATOR_CURRENT,
959 .owner = THIS_MODULE,
960 },
961 };
962
963 static __devinit int max8997_pmic_probe(struct platform_device *pdev)
964 {
965 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
966 struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
967 struct regulator_dev **rdev;
968 struct max8997_data *max8997;
969 struct i2c_client *i2c;
970 int i, ret, size;
971 u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
972
973 if (!pdata) {
974 dev_err(pdev->dev.parent, "No platform init data supplied.\n");
975 return -ENODEV;
976 }
977
978 max8997 = kzalloc(sizeof(struct max8997_data), GFP_KERNEL);
979 if (!max8997)
980 return -ENOMEM;
981
982 size = sizeof(struct regulator_dev *) * pdata->num_regulators;
983 max8997->rdev = kzalloc(size, GFP_KERNEL);
984 if (!max8997->rdev) {
985 kfree(max8997);
986 return -ENOMEM;
987 }
988
989 rdev = max8997->rdev;
990 max8997->dev = &pdev->dev;
991 max8997->iodev = iodev;
992 max8997->num_regulators = pdata->num_regulators;
993 platform_set_drvdata(pdev, max8997);
994 i2c = max8997->iodev->i2c;
995
996 max8997->buck125_gpioindex = pdata->buck125_default_idx;
997
998 for (i = 0; i < 8; i++) {
999 max8997->buck1_vol[i] = ret =
1000 max8997_get_voltage_proper_val(
1001 &buck1245_voltage_map_desc,
1002 pdata->buck1_voltage[i] / 1000,
1003 pdata->buck1_voltage[i] / 1000 +
1004 buck1245_voltage_map_desc.step);
1005 if (ret < 0)
1006 goto err_alloc;
1007
1008 max8997->buck2_vol[i] = ret =
1009 max8997_get_voltage_proper_val(
1010 &buck1245_voltage_map_desc,
1011 pdata->buck2_voltage[i] / 1000,
1012 pdata->buck2_voltage[i] / 1000 +
1013 buck1245_voltage_map_desc.step);
1014 if (ret < 0)
1015 goto err_alloc;
1016
1017 max8997->buck5_vol[i] = ret =
1018 max8997_get_voltage_proper_val(
1019 &buck1245_voltage_map_desc,
1020 pdata->buck5_voltage[i] / 1000,
1021 pdata->buck5_voltage[i] / 1000 +
1022 buck1245_voltage_map_desc.step);
1023 if (ret < 0)
1024 goto err_alloc;
1025
1026 if (max_buck1 < max8997->buck1_vol[i])
1027 max_buck1 = max8997->buck1_vol[i];
1028 if (max_buck2 < max8997->buck2_vol[i])
1029 max_buck2 = max8997->buck2_vol[i];
1030 if (max_buck5 < max8997->buck5_vol[i])
1031 max_buck5 = max8997->buck5_vol[i];
1032 }
1033
1034 /* For the safety, set max voltage before setting up */
1035 for (i = 0; i < 8; i++) {
1036 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS(i + 1),
1037 max_buck1, 0x3f);
1038 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS(i + 1),
1039 max_buck2, 0x3f);
1040 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS(i + 1),
1041 max_buck5, 0x3f);
1042 }
1043
1044 /*
1045 * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them.
1046 * If at least one of them cares, set gpios.
1047 */
1048 if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1049 pdata->buck5_gpiodvs) {
1050 bool gpio1set = false, gpio2set = false;
1051
1052 if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
1053 !gpio_is_valid(pdata->buck125_gpios[1]) ||
1054 !gpio_is_valid(pdata->buck125_gpios[2])) {
1055 dev_err(&pdev->dev, "GPIO NOT VALID\n");
1056 ret = -EINVAL;
1057 goto err_alloc;
1058 }
1059
1060 ret = gpio_request(pdata->buck125_gpios[0],
1061 "MAX8997 SET1");
1062 if (ret == -EBUSY)
1063 dev_warn(&pdev->dev, "Duplicated gpio request"
1064 " on SET1\n");
1065 else if (ret)
1066 goto err_alloc;
1067 else
1068 gpio1set = true;
1069
1070 ret = gpio_request(pdata->buck125_gpios[1],
1071 "MAX8997 SET2");
1072 if (ret == -EBUSY)
1073 dev_warn(&pdev->dev, "Duplicated gpio request"
1074 " on SET2\n");
1075 else if (ret) {
1076 if (gpio1set)
1077 gpio_free(pdata->buck125_gpios[0]);
1078 goto err_alloc;
1079 } else
1080 gpio2set = true;
1081
1082 ret = gpio_request(pdata->buck125_gpios[2],
1083 "MAX8997 SET3");
1084 if (ret == -EBUSY)
1085 dev_warn(&pdev->dev, "Duplicated gpio request"
1086 " on SET3\n");
1087 else if (ret) {
1088 if (gpio1set)
1089 gpio_free(pdata->buck125_gpios[0]);
1090 if (gpio2set)
1091 gpio_free(pdata->buck125_gpios[1]);
1092 goto err_alloc;
1093 }
1094
1095 gpio_direction_output(pdata->buck125_gpios[0],
1096 (max8997->buck125_gpioindex >> 2)
1097 & 0x1); /* SET1 */
1098 gpio_direction_output(pdata->buck125_gpios[1],
1099 (max8997->buck125_gpioindex >> 1)
1100 & 0x1); /* SET2 */
1101 gpio_direction_output(pdata->buck125_gpios[2],
1102 (max8997->buck125_gpioindex >> 0)
1103 & 0x1); /* SET3 */
1104 ret = 0;
1105 }
1106
1107 /* DVS-GPIO disabled */
1108 max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ?
1109 (1 << 1) : (0 << 1), 1 << 1);
1110 max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ?
1111 (1 << 1) : (0 << 1), 1 << 1);
1112 max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ?
1113 (1 << 1) : (0 << 1), 1 << 1);
1114
1115 /* Initialize all the DVS related BUCK registers */
1116 for (i = 0; i < 8; i++) {
1117 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS(i + 1),
1118 max8997->buck1_vol[i],
1119 0x3f);
1120 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS(i + 1),
1121 max8997->buck2_vol[i],
1122 0x3f);
1123 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS(i + 1),
1124 max8997->buck5_vol[i],
1125 0x3f);
1126 }
1127
1128 for (i = 0; i < pdata->num_regulators; i++) {
1129 const struct voltage_map_desc *desc;
1130 int id = pdata->regulators[i].id;
1131
1132 desc = reg_voltage_map[id];
1133 if (desc)
1134 regulators[id].n_voltages =
1135 (desc->max - desc->min) / desc->step + 1;
1136 else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2)
1137 regulators[id].n_voltages = 4;
1138 else if (id == MAX8997_CHARGER_CV)
1139 regulators[id].n_voltages = 16;
1140
1141 rdev[i] = regulator_register(&regulators[id], max8997->dev,
1142 pdata->regulators[i].initdata, max8997);
1143 if (IS_ERR(rdev[i])) {
1144 ret = PTR_ERR(rdev[i]);
1145 dev_err(max8997->dev, "regulator init failed for %d\n",
1146 id);
1147 rdev[i] = NULL;
1148 goto err;
1149 }
1150 }
1151
1152 /* Misc Settings */
1153 max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
1154 max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
1155
1156 return 0;
1157 err:
1158 for (i = 0; i < max8997->num_regulators; i++)
1159 if (rdev[i])
1160 regulator_unregister(rdev[i]);
1161 err_alloc:
1162 kfree(max8997->rdev);
1163 kfree(max8997);
1164
1165 return ret;
1166 }
1167
1168 static int __devexit max8997_pmic_remove(struct platform_device *pdev)
1169 {
1170 struct max8997_data *max8997 = platform_get_drvdata(pdev);
1171 struct regulator_dev **rdev = max8997->rdev;
1172 int i;
1173
1174 for (i = 0; i < max8997->num_regulators; i++)
1175 if (rdev[i])
1176 regulator_unregister(rdev[i]);
1177
1178 kfree(max8997->rdev);
1179 kfree(max8997);
1180
1181 return 0;
1182 }
1183
1184 static const struct platform_device_id max8997_pmic_id[] = {
1185 { "max8997-pmic", 0},
1186 { },
1187 };
1188 MODULE_DEVICE_TABLE(platform, max8997_pmic_id);
1189
1190 static struct platform_driver max8997_pmic_driver = {
1191 .driver = {
1192 .name = "max8997-pmic",
1193 .owner = THIS_MODULE,
1194 },
1195 .probe = max8997_pmic_probe,
1196 .remove = __devexit_p(max8997_pmic_remove),
1197 .id_table = max8997_pmic_id,
1198 };
1199
1200 static int __init max8997_pmic_init(void)
1201 {
1202 return platform_driver_register(&max8997_pmic_driver);
1203 }
1204 subsys_initcall(max8997_pmic_init);
1205
1206 static void __exit max8997_pmic_cleanup(void)
1207 {
1208 platform_driver_unregister(&max8997_pmic_driver);
1209 }
1210 module_exit(max8997_pmic_cleanup);
1211
1212 MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver");
1213 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1214 MODULE_LICENSE("GPL");
Linux 2.6 libata-dev (mirror)