tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Regulators driver for Marvell 88PM8607
3 *
4 * Copyright (C) 2009 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.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 version 2 as
9 * published by the Free Software Foundation.
10 */
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/err.h>
14#include <linux/i2c.h>
15#include <linux/platform_device.h>
16#include <linux/regulator/driver.h>
17#include <linux/regulator/machine.h>
18#include <linux/mfd/88pm860x.h>
19
20struct pm8607_regulator_info {
21 struct regulator_desc desc;
22 struct pm860x_chip *chip;
23 struct regulator_dev *regulator;
24 struct i2c_client *i2c;
25
26 int min_uV;
27 int max_uV;
28 int step_uV;
29 int vol_reg;
30 int vol_shift;
31 int vol_nbits;
32 int update_reg;
33 int update_bit;
34 int enable_reg;
35 int enable_bit;
36 int slope_double;
37};
38
39static inline int check_range(struct pm8607_regulator_info *info,
40 int min_uV, int max_uV)
41{
42 if (max_uV < info->min_uV || min_uV > info->max_uV || min_uV > max_uV)
43 return -EINVAL;
44
45 return 0;
46}
47
48static int pm8607_list_voltage(struct regulator_dev *rdev, unsigned index)
49{
50 struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
51 int ret = -EINVAL;
52
53 switch (info->desc.id) {
54 case PM8607_ID_BUCK1:
55 ret = (index < 0x1d) ? (index * 25000 + 800000) :
56 ((index < 0x20) ? 1500000 :
57 ((index < 0x40) ? ((index - 0x20) * 25000) :
58 -EINVAL));
59 break;
60 case PM8607_ID_BUCK3:
61 ret = (index < 0x3d) ? (index * 25000) :
62 ((index < 0x40) ? 1500000 : -EINVAL);
63 if (ret < 0)
64 break;
65 if (info->slope_double)
66 ret <<= 1;
67 break;
68 case PM8607_ID_LDO1:
69 ret = (index == 0) ? 1800000 :
70 ((index == 1) ? 1200000 :
71 ((index == 2) ? 2800000 : -EINVAL));
72 break;
73 case PM8607_ID_LDO5:
74 ret = (index == 0) ? 2900000 :
75 ((index == 1) ? 3000000 :
76 ((index == 2) ? 3100000 : 3300000));
77 break;
78 case PM8607_ID_LDO7:
79 case PM8607_ID_LDO8:
80 ret = (index < 3) ? (index * 50000 + 1800000) :
81 ((index < 8) ? (index * 50000 + 2550000) :
82 -EINVAL);
83 break;
84 case PM8607_ID_LDO12:
85 ret = (index < 2) ? (index * 100000 + 1800000) :
86 ((index < 7) ? (index * 100000 + 2500000) :
87 ((index == 7) ? 3300000 : 1200000));
88 break;
89 case PM8607_ID_LDO2:
90 case PM8607_ID_LDO3:
91 case PM8607_ID_LDO9:
92 ret = (index < 3) ? (index * 50000 + 1800000) :
93 ((index < 7) ? (index * 50000 + 2550000) :
94 3300000);
95 break;
96 case PM8607_ID_LDO4:
97 ret = (index < 3) ? (index * 50000 + 1800000) :
98 ((index < 6) ? (index * 50000 + 2550000) :
99 ((index == 6) ? 2900000 : 3300000));
100 break;
101 case PM8607_ID_LDO6:
102 ret = (index < 2) ? (index * 50000 + 1800000) :
103 ((index < 7) ? (index * 50000 + 2500000) :
104 3300000);
105 break;
106 case PM8607_ID_LDO10:
107 ret = (index < 3) ? (index * 50000 + 1800000) :
108 ((index < 7) ? (index * 50000 + 2550000) :
109 ((index == 7) ? 3300000 : 1200000));
110 break;
111 case PM8607_ID_LDO14:
112 ret = (index < 2) ? (index * 50000 + 1800000) :
113 ((index < 7) ? (index * 50000 + 2600000) :
114 3300000);
115 break;
116 }
117 return ret;
118}
119
120static int choose_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
121{
122 struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
123 int val = -ENOENT;
124 int ret;
125
126 switch (info->desc.id) {
127 case PM8607_ID_BUCK1:
128 if (min_uV >= 800000) /* 800mV ~ 1500mV / 25mV */
129 val = (min_uV - 775001) / 25000;
130 else { /* 25mV ~ 775mV / 25mV */
131 val = (min_uV + 249999) / 25000;
132 val += 32;
133 }
134 break;
135 case PM8607_ID_BUCK3:
136 if (info->slope_double)
137 min_uV = min_uV >> 1;
138 val = (min_uV + 249999) / 25000; /* 0mV ~ 1500mV / 25mV */
139
140 break;
141 case PM8607_ID_LDO1:
142 if (min_uV > 1800000)
143 val = 2;
144 else if (min_uV > 1200000)
145 val = 0;
146 else
147 val = 1;
148 break;
149 case PM8607_ID_LDO5:
150 if (min_uV > 3100000)
151 val = 3;
152 else /* 2900mV ~ 3100mV / 100mV */
153 val = (min_uV - 2800001) / 100000;
154 break;
155 case PM8607_ID_LDO7:
156 case PM8607_ID_LDO8:
157 if (min_uV < 2700000) { /* 1800mV ~ 1900mV / 50mV */
158 if (min_uV <= 1800000)
159 val = 0; /* 1800mv */
160 else if (min_uV <= 1900000)
161 val = (min_uV - 1750001) / 50000;
162 else
163 val = 3; /* 2700mV */
164 } else { /* 2700mV ~ 2900mV / 50mV */
165 if (min_uV <= 2900000) {
166 val = (min_uV - 2650001) / 50000;
167 val += 3;
168 } else
169 val = -EINVAL;
170 }
171 break;
172 case PM8607_ID_LDO10:
173 if (min_uV > 2850000)
174 val = 7;
175 else if (min_uV <= 1200000)
176 val = 8;
177 else if (min_uV < 2700000) /* 1800mV ~ 1900mV / 50mV */
178 val = (min_uV - 1750001) / 50000;
179 else { /* 2700mV ~ 2850mV / 50mV */
180 val = (min_uV - 2650001) / 50000;
181 val += 3;
182 }
183 break;
184 case PM8607_ID_LDO12:
185 if (min_uV < 2700000) { /* 1800mV ~ 1900mV / 100mV */
186 if (min_uV <= 1200000)
187 val = 8; /* 1200mV */
188 else if (min_uV <= 1800000)
189 val = 0; /* 1800mV */
190 else if (min_uV <= 1900000)
191 val = (min_uV - 1700001) / 100000;
192 else
193 val = 2; /* 2700mV */
194 } else { /* 2700mV ~ 3100mV / 100mV */
195 if (min_uV <= 3100000) {
196 val = (min_uV - 2600001) / 100000;
197 val += 2;
198 } else if (min_uV <= 3300000)
199 val = 7;
200 else
201 val = -EINVAL;
202 }
203 break;
204 case PM8607_ID_LDO2:
205 case PM8607_ID_LDO3:
206 case PM8607_ID_LDO9:
207 if (min_uV < 2700000) { /* 1800mV ~ 1900mV / 50mV */
208 if (min_uV <= 1800000)
209 val = 0;
210 else if (min_uV <= 1900000)
211 val = (min_uV - 1750001) / 50000;
212 else
213 val = 3; /* 2700mV */
214 } else { /* 2700mV ~ 2850mV / 50mV */
215 if (min_uV <= 2850000) {
216 val = (min_uV - 2650001) / 50000;
217 val += 3;
218 } else if (min_uV <= 3300000)
219 val = 7;
220 else
221 val = -EINVAL;
222 }
223 break;
224 case PM8607_ID_LDO4:
225 if (min_uV < 2700000) { /* 1800mV ~ 1900mV / 50mV */
226 if (min_uV <= 1800000)
227 val = 0;
228 else if (min_uV <= 1900000)
229 val = (min_uV - 1750001) / 50000;
230 else
231 val = 3; /* 2700mV */
232 } else { /* 2700mV ~ 2800mV / 50mV */
233 if (min_uV <= 2850000) {
234 val = (min_uV - 2650001) / 50000;
235 val += 3;
236 } else if (min_uV <= 2900000)
237 val = 6;
238 else if (min_uV <= 3300000)
239 val = 7;
240 else
241 val = -EINVAL;
242 }
243 break;
244 case PM8607_ID_LDO6:
245 if (min_uV < 2600000) { /* 1800mV ~ 1850mV / 50mV */
246 if (min_uV <= 1800000)
247 val = 0;
248 else if (min_uV <= 1850000)
249 val = (min_uV - 1750001) / 50000;
250 else
251 val = 2; /* 2600mV */
252 } else { /* 2600mV ~ 2800mV / 50mV */
253 if (min_uV <= 2800000) {
254 val = (min_uV - 2550001) / 50000;
255 val += 2;
256 } else if (min_uV <= 3300000)
257 val = 7;
258 else
259 val = -EINVAL;
260 }
261 break;
262 case PM8607_ID_LDO14:
263 if (min_uV < 2700000) { /* 1800mV ~ 1850mV / 50mV */
264 if (min_uV <= 1800000)
265 val = 0;
266 else if (min_uV <= 1850000)
267 val = (min_uV - 1750001) / 50000;
268 else
269 val = 2; /* 2700mV */
270 } else { /* 2700mV ~ 2900mV / 50mV */
271 if (min_uV <= 2900000) {
272 val = (min_uV - 2650001) / 50000;
273 val += 2;
274 } else if (min_uV <= 3300000)
275 val = 7;
276 else
277 val = -EINVAL;
278 }
279 break;
280 }
281 if (val >= 0) {
282 ret = pm8607_list_voltage(rdev, val);
283 if (ret > max_uV) {
284 pr_err("exceed voltage range (%d %d) uV",
285 min_uV, max_uV);
286 return -EINVAL;
287 }
288 } else
289 pr_err("invalid voltage range (%d %d) uV", min_uV, max_uV);
290 return val;
291}
292
293static int pm8607_set_voltage(struct regulator_dev *rdev,
294 int min_uV, int max_uV)
295{
296 struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
297 uint8_t val, mask;
298 int ret;
299
300 if (check_range(info, min_uV, max_uV)) {
301 pr_err("invalid voltage range (%d, %d) uV\n", min_uV, max_uV);
302 return -EINVAL;
303 }
304
305 ret = choose_voltage(rdev, min_uV, max_uV);
306 if (ret < 0)
307 return -EINVAL;
308 val = (uint8_t)(ret << info->vol_shift);
309 mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
310
311 ret = pm860x_set_bits(info->i2c, info->vol_reg, mask, val);
312 if (ret)
313 return ret;
314 switch (info->desc.id) {
315 case PM8607_ID_BUCK1:
316 case PM8607_ID_BUCK3:
317 ret = pm860x_set_bits(info->i2c, info->update_reg,
318 1 << info->update_bit,
319 1 << info->update_bit);
320 break;
321 }
322 return ret;
323}
324
325static int pm8607_get_voltage(struct regulator_dev *rdev)
326{
327 struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
328 uint8_t val, mask;
329 int ret;
330
331 ret = pm860x_reg_read(info->i2c, info->vol_reg);
332 if (ret < 0)
333 return ret;
334
335 mask = ((1 << info->vol_nbits) - 1) << info->vol_shift;
336 val = ((unsigned char)ret & mask) >> info->vol_shift;
337
338 return pm8607_list_voltage(rdev, val);
339}
340
341static int pm8607_enable(struct regulator_dev *rdev)
342{
343 struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
344
345 return pm860x_set_bits(info->i2c, info->enable_reg,
346 1 << info->enable_bit,
347 1 << info->enable_bit);
348}
349
350static int pm8607_disable(struct regulator_dev *rdev)
351{
352 struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
353
354 return pm860x_set_bits(info->i2c, info->enable_reg,
355 1 << info->enable_bit, 0);
356}
357
358static int pm8607_is_enabled(struct regulator_dev *rdev)
359{
360 struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
361 int ret;
362
363 ret = pm860x_reg_read(info->i2c, info->enable_reg);
364 if (ret < 0)
365 return ret;
366
367 return !!((unsigned char)ret & (1 << info->enable_bit));
368}
369
370static struct regulator_ops pm8607_regulator_ops = {
371 .set_voltage = pm8607_set_voltage,
372 .get_voltage = pm8607_get_voltage,
373 .enable = pm8607_enable,
374 .disable = pm8607_disable,
375 .is_enabled = pm8607_is_enabled,
376};
377
378#define PM8607_DVC(_id, min, max, step, vreg, nbits, ureg, ubit, ereg, ebit) \
379{ \
380 .desc = { \
381 .name = "BUCK" #_id, \
382 .ops = &pm8607_regulator_ops, \
383 .type = REGULATOR_VOLTAGE, \
384 .id = PM8607_ID_BUCK##_id, \
385 .owner = THIS_MODULE, \
386 }, \
387 .min_uV = (min) * 1000, \
388 .max_uV = (max) * 1000, \
389 .step_uV = (step) * 1000, \
390 .vol_reg = PM8607_##vreg, \
391 .vol_shift = (0), \
392 .vol_nbits = (nbits), \
393 .update_reg = PM8607_##ureg, \
394 .update_bit = (ubit), \
395 .enable_reg = PM8607_##ereg, \
396 .enable_bit = (ebit), \
397 .slope_double = (0), \
398}
399
400#define PM8607_LDO(_id, min, max, step, vreg, shift, nbits, ereg, ebit) \
401{ \
402 .desc = { \
403 .name = "LDO" #_id, \
404 .ops = &pm8607_regulator_ops, \
405 .type = REGULATOR_VOLTAGE, \
406 .id = PM8607_ID_LDO##_id, \
407 .owner = THIS_MODULE, \
408 }, \
409 .min_uV = (min) * 1000, \
410 .max_uV = (max) * 1000, \
411 .step_uV = (step) * 1000, \
412 .vol_reg = PM8607_##vreg, \
413 .vol_shift = (shift), \
414 .vol_nbits = (nbits), \
415 .enable_reg = PM8607_##ereg, \
416 .enable_bit = (ebit), \
417 .slope_double = (0), \
418}
419
420static struct pm8607_regulator_info pm8607_regulator_info[] = {
421 PM8607_DVC(1, 0, 1500, 25, BUCK1, 6, GO, 0, SUPPLIES_EN11, 0),
422 PM8607_DVC(3, 0, 1500, 25, BUCK3, 6, GO, 2, SUPPLIES_EN11, 2),
423
424 PM8607_LDO(1 , 1200, 2800, 0, LDO1 , 0, 2, SUPPLIES_EN11, 3),
425 PM8607_LDO(2 , 1800, 3300, 0, LDO2 , 0, 3, SUPPLIES_EN11, 4),
426 PM8607_LDO(3 , 1800, 3300, 0, LDO3 , 0, 3, SUPPLIES_EN11, 5),
427 PM8607_LDO(4 , 1800, 3300, 0, LDO4 , 0, 3, SUPPLIES_EN11, 6),
428 PM8607_LDO(5 , 2900, 3300, 0, LDO5 , 0, 2, SUPPLIES_EN11, 7),
429 PM8607_LDO(6 , 1800, 3300, 0, LDO6 , 0, 3, SUPPLIES_EN12, 0),
430 PM8607_LDO(7 , 1800, 2900, 0, LDO7 , 0, 3, SUPPLIES_EN12, 1),
431 PM8607_LDO(8 , 1800, 2900, 0, LDO8 , 0, 3, SUPPLIES_EN12, 2),
432 PM8607_LDO(9 , 1800, 3300, 0, LDO9 , 0, 3, SUPPLIES_EN12, 3),
433 PM8607_LDO(10, 1200, 3300, 0, LDO10, 0, 4, SUPPLIES_EN11, 4),
434 PM8607_LDO(12, 1200, 3300, 0, LDO12, 0, 4, SUPPLIES_EN11, 5),
435 PM8607_LDO(14, 1800, 3300, 0, LDO14, 0, 3, SUPPLIES_EN11, 6),
436};
437
438static inline struct pm8607_regulator_info *find_regulator_info(int id)
439{
440 struct pm8607_regulator_info *info;
441 int i;
442
443 for (i = 0; i < ARRAY_SIZE(pm8607_regulator_info); i++) {
444 info = &pm8607_regulator_info[i];
445 if (info->desc.id == id)
446 return info;
447 }
448 return NULL;
449}
450
451static int __devinit pm8607_regulator_probe(struct platform_device *pdev)
452{
453 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
454 struct pm860x_platform_data *pdata = chip->dev->platform_data;
455 struct pm8607_regulator_info *info = NULL;
456
457 info = find_regulator_info(pdev->id);
458 if (info == NULL) {
459 dev_err(&pdev->dev, "invalid regulator ID specified\n");
460 return -EINVAL;
461 }
462
463 info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
464 info->chip = chip;
465
466 info->regulator = regulator_register(&info->desc, &pdev->dev,
467 pdata->regulator[pdev->id], info);
468 if (IS_ERR(info->regulator)) {
469 dev_err(&pdev->dev, "failed to register regulator %s\n",
470 info->desc.name);
471 return PTR_ERR(info->regulator);
472 }
473
474 /* check DVC ramp slope double */
475 if (info->desc.id == PM8607_ID_BUCK3)
476 if (info->chip->buck3_double)
477 info->slope_double = 1;
478
479 platform_set_drvdata(pdev, info);
480 return 0;
481}
482
483static int __devexit pm8607_regulator_remove(struct platform_device *pdev)
484{
485 struct pm8607_regulator_info *info = platform_get_drvdata(pdev);
486
487 regulator_unregister(info->regulator);
488 return 0;
489}
490
491#define PM8607_REGULATOR_DRIVER(_name) \
492{ \
493 .driver = { \
494 .name = "88pm8607-" #_name, \
495 .owner = THIS_MODULE, \
496 }, \
497 .probe = pm8607_regulator_probe, \
498 .remove = __devexit_p(pm8607_regulator_remove), \
499}
500
501static struct platform_driver pm8607_regulator_driver[] = {
502 PM8607_REGULATOR_DRIVER(buck1),
503 PM8607_REGULATOR_DRIVER(buck2),
504 PM8607_REGULATOR_DRIVER(buck3),
505 PM8607_REGULATOR_DRIVER(ldo1),
506 PM8607_REGULATOR_DRIVER(ldo2),
507 PM8607_REGULATOR_DRIVER(ldo3),
508 PM8607_REGULATOR_DRIVER(ldo4),
509 PM8607_REGULATOR_DRIVER(ldo5),
510 PM8607_REGULATOR_DRIVER(ldo6),
511 PM8607_REGULATOR_DRIVER(ldo7),
512 PM8607_REGULATOR_DRIVER(ldo8),
513 PM8607_REGULATOR_DRIVER(ldo9),
514 PM8607_REGULATOR_DRIVER(ldo10),
515 PM8607_REGULATOR_DRIVER(ldo12),
516 PM8607_REGULATOR_DRIVER(ldo14),
517};
518
519static int __init pm8607_regulator_init(void)
520{
521 int i, count, ret;
522
523 count = ARRAY_SIZE(pm8607_regulator_driver);
524 for (i = 0; i < count; i++) {
525 ret = platform_driver_register(&pm8607_regulator_driver[i]);
526 if (ret != 0)
527 pr_err("Failed to register regulator driver: %d\n",
528 ret);
529 }
530 return 0;
531}
532subsys_initcall(pm8607_regulator_init);
533
534static void __exit pm8607_regulator_exit(void)
535{
536 int i, count;
537
538 count = ARRAY_SIZE(pm8607_regulator_driver);
539 for (i = 0; i < count; i++)
540 platform_driver_unregister(&pm8607_regulator_driver[i]);
541}
542module_exit(pm8607_regulator_exit);
543
544MODULE_LICENSE("GPL");
545MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
546MODULE_DESCRIPTION("Regulator Driver for Marvell 88PM8607 PMIC");
547MODULE_ALIAS("platform:88pm8607-regulator");