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1/*
2 * Regulator driver for National Semiconductors LP3971 PMIC chip
3 *
4 * Copyright (C) 2009 Samsung Electronics
5 * Author: Marek Szyprowski <m.szyprowski@samsung.com>
6 *
7 * Based on wm8350.c
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 */
14
15#include <linux/bug.h>
16#include <linux/err.h>
17#include <linux/i2c.h>
18#include <linux/kernel.h>
19#include <linux/regulator/driver.h>
20#include <linux/regulator/lp3971.h>
21#include <linux/slab.h>
22
23struct lp3971 {
24 struct device *dev;
25 struct mutex io_lock;
26 struct i2c_client *i2c;
27 int num_regulators;
28 struct regulator_dev **rdev;
29};
30
31static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
32static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);
33
34#define LP3971_SYS_CONTROL1_REG 0x07
35
36/* System control register 1 initial value,
37 bits 4 and 5 are EPROM programmable */
38#define SYS_CONTROL1_INIT_VAL 0x40
39#define SYS_CONTROL1_INIT_MASK 0xCF
40
41#define LP3971_BUCK_VOL_ENABLE_REG 0x10
42#define LP3971_BUCK_VOL_CHANGE_REG 0x20
43
44/* Voltage control registers shift:
45 LP3971_BUCK1 -> 0
46 LP3971_BUCK2 -> 4
47 LP3971_BUCK3 -> 6
48*/
49#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01))
50#define BUCK_VOL_CHANGE_FLAG_GO 0x01
51#define BUCK_VOL_CHANGE_FLAG_TARGET 0x02
52#define BUCK_VOL_CHANGE_FLAG_MASK 0x03
53
54#define LP3971_BUCK1_BASE 0x23
55#define LP3971_BUCK2_BASE 0x29
56#define LP3971_BUCK3_BASE 0x32
57
58static const int buck_base_addr[] = {
59 LP3971_BUCK1_BASE,
60 LP3971_BUCK2_BASE,
61 LP3971_BUCK3_BASE,
62};
63
64#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])
65#define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)
66
67static const int buck_voltage_map[] = {
68 0, 800, 850, 900, 950, 1000, 1050, 1100,
69 1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500,
70 1550, 1600, 1650, 1700, 1800, 1900, 2500, 2800,
71 3000, 3300,
72};
73
74#define BUCK_TARGET_VOL_MASK 0x3f
75#define BUCK_TARGET_VOL_MIN_IDX 0x01
76#define BUCK_TARGET_VOL_MAX_IDX 0x19
77
78#define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
79
80#define LP3971_LDO_ENABLE_REG 0x12
81#define LP3971_LDO_VOL_CONTR_BASE 0x39
82
83/* Voltage control registers:
84 LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
85 LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
86 LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
87 LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
88 LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
89*/
90#define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
91
92/* Voltage control registers shift:
93 LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
94 LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
95 LP3971_LDO5 -> 0
96*/
97#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
98#define LDO_VOL_CONTR_MASK 0x0f
99
100static const int ldo45_voltage_map[] = {
101 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350,
102 1400, 1500, 1800, 1900, 2500, 2800, 3000, 3300,
103};
104
105static const int ldo123_voltage_map[] = {
106 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500,
107 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300,
108};
109
110static const int *ldo_voltage_map[] = {
111 ldo123_voltage_map, /* LDO1 */
112 ldo123_voltage_map, /* LDO2 */
113 ldo123_voltage_map, /* LDO3 */
114 ldo45_voltage_map, /* LDO4 */
115 ldo45_voltage_map, /* LDO5 */
116};
117
118#define LDO_VOL_VALUE_MAP(x) (ldo_voltage_map[(x - LP3971_LDO1)])
119
120#define LDO_VOL_MIN_IDX 0x00
121#define LDO_VOL_MAX_IDX 0x0f
122
123static int lp3971_ldo_list_voltage(struct regulator_dev *dev, unsigned index)
124{
125 int ldo = rdev_get_id(dev) - LP3971_LDO1;
126 return 1000 * LDO_VOL_VALUE_MAP(ldo)[index];
127}
128
129static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
130{
131 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
132 int ldo = rdev_get_id(dev) - LP3971_LDO1;
133 u16 mask = 1 << (1 + ldo);
134 u16 val;
135
136 val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
137 return (val & mask) != 0;
138}
139
140static int lp3971_ldo_enable(struct regulator_dev *dev)
141{
142 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
143 int ldo = rdev_get_id(dev) - LP3971_LDO1;
144 u16 mask = 1 << (1 + ldo);
145
146 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
147}
148
149static int lp3971_ldo_disable(struct regulator_dev *dev)
150{
151 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
152 int ldo = rdev_get_id(dev) - LP3971_LDO1;
153 u16 mask = 1 << (1 + ldo);
154
155 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
156}
157
158static int lp3971_ldo_get_voltage(struct regulator_dev *dev)
159{
160 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
161 int ldo = rdev_get_id(dev) - LP3971_LDO1;
162 u16 val, reg;
163
164 reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
165 val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
166
167 return 1000 * LDO_VOL_VALUE_MAP(ldo)[val];
168}
169
170static int lp3971_ldo_set_voltage(struct regulator_dev *dev,
171 int min_uV, int max_uV,
172 unsigned int *selector)
173{
174 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
175 int ldo = rdev_get_id(dev) - LP3971_LDO1;
176 int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
177 const int *vol_map = LDO_VOL_VALUE_MAP(ldo);
178 u16 val;
179
180 if (min_vol < vol_map[LDO_VOL_MIN_IDX] ||
181 min_vol > vol_map[LDO_VOL_MAX_IDX])
182 return -EINVAL;
183
184 for (val = LDO_VOL_MIN_IDX; val <= LDO_VOL_MAX_IDX; val++)
185 if (vol_map[val] >= min_vol)
186 break;
187
188 if (val > LDO_VOL_MAX_IDX || vol_map[val] > max_vol)
189 return -EINVAL;
190
191 *selector = val;
192
193 return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
194 LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
195 val << LDO_VOL_CONTR_SHIFT(ldo));
196}
197
198static struct regulator_ops lp3971_ldo_ops = {
199 .list_voltage = lp3971_ldo_list_voltage,
200 .is_enabled = lp3971_ldo_is_enabled,
201 .enable = lp3971_ldo_enable,
202 .disable = lp3971_ldo_disable,
203 .get_voltage = lp3971_ldo_get_voltage,
204 .set_voltage = lp3971_ldo_set_voltage,
205};
206
207static int lp3971_dcdc_list_voltage(struct regulator_dev *dev, unsigned index)
208{
209 return 1000 * buck_voltage_map[index];
210}
211
212static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
213{
214 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
215 int buck = rdev_get_id(dev) - LP3971_DCDC1;
216 u16 mask = 1 << (buck * 2);
217 u16 val;
218
219 val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
220 return (val & mask) != 0;
221}
222
223static int lp3971_dcdc_enable(struct regulator_dev *dev)
224{
225 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
226 int buck = rdev_get_id(dev) - LP3971_DCDC1;
227 u16 mask = 1 << (buck * 2);
228
229 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
230}
231
232static int lp3971_dcdc_disable(struct regulator_dev *dev)
233{
234 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
235 int buck = rdev_get_id(dev) - LP3971_DCDC1;
236 u16 mask = 1 << (buck * 2);
237
238 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
239}
240
241static int lp3971_dcdc_get_voltage(struct regulator_dev *dev)
242{
243 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
244 int buck = rdev_get_id(dev) - LP3971_DCDC1;
245 u16 reg;
246 int val;
247
248 reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
249 reg &= BUCK_TARGET_VOL_MASK;
250
251 if (reg <= BUCK_TARGET_VOL_MAX_IDX)
252 val = 1000 * buck_voltage_map[reg];
253 else {
254 val = 0;
255 dev_warn(&dev->dev, "chip reported incorrect voltage value.\n");
256 }
257
258 return val;
259}
260
261static int lp3971_dcdc_set_voltage(struct regulator_dev *dev,
262 int min_uV, int max_uV,
263 unsigned int *selector)
264{
265 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
266 int buck = rdev_get_id(dev) - LP3971_DCDC1;
267 int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
268 const int *vol_map = buck_voltage_map;
269 u16 val;
270 int ret;
271
272 if (min_vol < vol_map[BUCK_TARGET_VOL_MIN_IDX] ||
273 min_vol > vol_map[BUCK_TARGET_VOL_MAX_IDX])
274 return -EINVAL;
275
276 for (val = BUCK_TARGET_VOL_MIN_IDX; val <= BUCK_TARGET_VOL_MAX_IDX;
277 val++)
278 if (vol_map[val] >= min_vol)
279 break;
280
281 if (val > BUCK_TARGET_VOL_MAX_IDX || vol_map[val] > max_vol)
282 return -EINVAL;
283
284 *selector = val;
285
286 ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
287 BUCK_TARGET_VOL_MASK, val);
288 if (ret)
289 return ret;
290
291 ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
292 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
293 BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
294 if (ret)
295 return ret;
296
297 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
298 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
299 0 << BUCK_VOL_CHANGE_SHIFT(buck));
300}
301
302static struct regulator_ops lp3971_dcdc_ops = {
303 .list_voltage = lp3971_dcdc_list_voltage,
304 .is_enabled = lp3971_dcdc_is_enabled,
305 .enable = lp3971_dcdc_enable,
306 .disable = lp3971_dcdc_disable,
307 .get_voltage = lp3971_dcdc_get_voltage,
308 .set_voltage = lp3971_dcdc_set_voltage,
309};
310
311static struct regulator_desc regulators[] = {
312 {
313 .name = "LDO1",
314 .id = LP3971_LDO1,
315 .ops = &lp3971_ldo_ops,
316 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
317 .type = REGULATOR_VOLTAGE,
318 .owner = THIS_MODULE,
319 },
320 {
321 .name = "LDO2",
322 .id = LP3971_LDO2,
323 .ops = &lp3971_ldo_ops,
324 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
325 .type = REGULATOR_VOLTAGE,
326 .owner = THIS_MODULE,
327 },
328 {
329 .name = "LDO3",
330 .id = LP3971_LDO3,
331 .ops = &lp3971_ldo_ops,
332 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
333 .type = REGULATOR_VOLTAGE,
334 .owner = THIS_MODULE,
335 },
336 {
337 .name = "LDO4",
338 .id = LP3971_LDO4,
339 .ops = &lp3971_ldo_ops,
340 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
341 .type = REGULATOR_VOLTAGE,
342 .owner = THIS_MODULE,
343 },
344 {
345 .name = "LDO5",
346 .id = LP3971_LDO5,
347 .ops = &lp3971_ldo_ops,
348 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
349 .type = REGULATOR_VOLTAGE,
350 .owner = THIS_MODULE,
351 },
352 {
353 .name = "DCDC1",
354 .id = LP3971_DCDC1,
355 .ops = &lp3971_dcdc_ops,
356 .n_voltages = ARRAY_SIZE(buck_voltage_map),
357 .type = REGULATOR_VOLTAGE,
358 .owner = THIS_MODULE,
359 },
360 {
361 .name = "DCDC2",
362 .id = LP3971_DCDC2,
363 .ops = &lp3971_dcdc_ops,
364 .n_voltages = ARRAY_SIZE(buck_voltage_map),
365 .type = REGULATOR_VOLTAGE,
366 .owner = THIS_MODULE,
367 },
368 {
369 .name = "DCDC3",
370 .id = LP3971_DCDC3,
371 .ops = &lp3971_dcdc_ops,
372 .n_voltages = ARRAY_SIZE(buck_voltage_map),
373 .type = REGULATOR_VOLTAGE,
374 .owner = THIS_MODULE,
375 },
376};
377
378static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
379 u16 *dest)
380{
381 int ret;
382
383 if (count != 1)
384 return -EIO;
385 ret = i2c_smbus_read_byte_data(i2c, reg);
386 if (ret < 0)
387 return -EIO;
388
389 *dest = ret;
390 return 0;
391}
392
393static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
394 const u16 *src)
395{
396 if (count != 1)
397 return -EIO;
398 return i2c_smbus_write_byte_data(i2c, reg, *src);
399}
400
401static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
402{
403 u16 val = 0;
404
405 mutex_lock(&lp3971->io_lock);
406
407 lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
408
409 dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
410 (unsigned)val&0xff);
411
412 mutex_unlock(&lp3971->io_lock);
413
414 return val & 0xff;
415}
416
417static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
418{
419 u16 tmp;
420 int ret;
421
422 mutex_lock(&lp3971->io_lock);
423
424 ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
425 tmp = (tmp & ~mask) | val;
426 if (ret == 0) {
427 ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
428 dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
429 (unsigned)val&0xff);
430 }
431 mutex_unlock(&lp3971->io_lock);
432
433 return ret;
434}
435
436static int __devinit setup_regulators(struct lp3971 *lp3971,
437 struct lp3971_platform_data *pdata)
438{
439 int i, err;
440
441 lp3971->num_regulators = pdata->num_regulators;
442 lp3971->rdev = kcalloc(pdata->num_regulators,
443 sizeof(struct regulator_dev *), GFP_KERNEL);
444 if (!lp3971->rdev) {
445 err = -ENOMEM;
446 goto err_nomem;
447 }
448
449 /* Instantiate the regulators */
450 for (i = 0; i < pdata->num_regulators; i++) {
451 struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
452 lp3971->rdev[i] = regulator_register(®ulators[reg->id],
453 lp3971->dev, reg->initdata, lp3971);
454
455 if (IS_ERR(lp3971->rdev[i])) {
456 err = PTR_ERR(lp3971->rdev[i]);
457 dev_err(lp3971->dev, "regulator init failed: %d\n",
458 err);
459 goto error;
460 }
461 }
462
463 return 0;
464
465error:
466 while (--i >= 0)
467 regulator_unregister(lp3971->rdev[i]);
468 kfree(lp3971->rdev);
469 lp3971->rdev = NULL;
470err_nomem:
471 return err;
472}
473
474static int __devinit lp3971_i2c_probe(struct i2c_client *i2c,
475 const struct i2c_device_id *id)
476{
477 struct lp3971 *lp3971;
478 struct lp3971_platform_data *pdata = i2c->dev.platform_data;
479 int ret;
480 u16 val;
481
482 if (!pdata) {
483 dev_dbg(&i2c->dev, "No platform init data supplied\n");
484 return -ENODEV;
485 }
486
487 lp3971 = kzalloc(sizeof(struct lp3971), GFP_KERNEL);
488 if (lp3971 == NULL)
489 return -ENOMEM;
490
491 lp3971->i2c = i2c;
492 lp3971->dev = &i2c->dev;
493
494 mutex_init(&lp3971->io_lock);
495
496 /* Detect LP3971 */
497 ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
498 if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
499 ret = -ENODEV;
500 if (ret < 0) {
501 dev_err(&i2c->dev, "failed to detect device\n");
502 goto err_detect;
503 }
504
505 ret = setup_regulators(lp3971, pdata);
506 if (ret < 0)
507 goto err_detect;
508
509 i2c_set_clientdata(i2c, lp3971);
510 return 0;
511
512err_detect:
513 kfree(lp3971);
514 return ret;
515}
516
517static int __devexit lp3971_i2c_remove(struct i2c_client *i2c)
518{
519 struct lp3971 *lp3971 = i2c_get_clientdata(i2c);
520 int i;
521
522 for (i = 0; i < lp3971->num_regulators; i++)
523 regulator_unregister(lp3971->rdev[i]);
524
525 kfree(lp3971->rdev);
526 kfree(lp3971);
527
528 return 0;
529}
530
531static const struct i2c_device_id lp3971_i2c_id[] = {
532 { "lp3971", 0 },
533 { }
534};
535MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
536
537static struct i2c_driver lp3971_i2c_driver = {
538 .driver = {
539 .name = "LP3971",
540 .owner = THIS_MODULE,
541 },
542 .probe = lp3971_i2c_probe,
543 .remove = __devexit_p(lp3971_i2c_remove),
544 .id_table = lp3971_i2c_id,
545};
546
547static int __init lp3971_module_init(void)
548{
549 int ret;
550
551 ret = i2c_add_driver(&lp3971_i2c_driver);
552 if (ret != 0)
553 pr_err("Failed to register I2C driver: %d\n", ret);
554
555 return ret;
556}
557module_init(lp3971_module_init);
558
559static void __exit lp3971_module_exit(void)
560{
561 i2c_del_driver(&lp3971_i2c_driver);
562}
563module_exit(lp3971_module_exit);
564
565MODULE_LICENSE("GPL");
566MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
567MODULE_DESCRIPTION("LP3971 PMIC driver");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Regulator driver for National Semiconductors LP3971 PMIC chip
4 *
5 * Copyright (C) 2009 Samsung Electronics
6 * Author: Marek Szyprowski <m.szyprowski@samsung.com>
7 *
8 * Based on wm8350.c
9 */
10
11#include <linux/bug.h>
12#include <linux/err.h>
13#include <linux/i2c.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/regulator/driver.h>
17#include <linux/regulator/lp3971.h>
18#include <linux/slab.h>
19
20struct lp3971 {
21 struct device *dev;
22 struct mutex io_lock;
23 struct i2c_client *i2c;
24};
25
26static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
27static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);
28
29#define LP3971_SYS_CONTROL1_REG 0x07
30
31/* System control register 1 initial value,
32 bits 4 and 5 are EPROM programmable */
33#define SYS_CONTROL1_INIT_VAL 0x40
34#define SYS_CONTROL1_INIT_MASK 0xCF
35
36#define LP3971_BUCK_VOL_ENABLE_REG 0x10
37#define LP3971_BUCK_VOL_CHANGE_REG 0x20
38
39/* Voltage control registers shift:
40 LP3971_BUCK1 -> 0
41 LP3971_BUCK2 -> 4
42 LP3971_BUCK3 -> 6
43*/
44#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01))
45#define BUCK_VOL_CHANGE_FLAG_GO 0x01
46#define BUCK_VOL_CHANGE_FLAG_TARGET 0x02
47#define BUCK_VOL_CHANGE_FLAG_MASK 0x03
48
49#define LP3971_BUCK1_BASE 0x23
50#define LP3971_BUCK2_BASE 0x29
51#define LP3971_BUCK3_BASE 0x32
52
53static const int buck_base_addr[] = {
54 LP3971_BUCK1_BASE,
55 LP3971_BUCK2_BASE,
56 LP3971_BUCK3_BASE,
57};
58
59#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])
60#define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)
61
62static const unsigned int buck_voltage_map[] = {
63 0, 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000,
64 1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
65 1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000,
66 3000000, 3300000,
67};
68
69#define BUCK_TARGET_VOL_MASK 0x3f
70
71#define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
72
73#define LP3971_LDO_ENABLE_REG 0x12
74#define LP3971_LDO_VOL_CONTR_BASE 0x39
75
76/* Voltage control registers:
77 LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
78 LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
79 LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
80 LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
81 LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
82*/
83#define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
84
85/* Voltage control registers shift:
86 LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
87 LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
88 LP3971_LDO5 -> 0
89*/
90#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
91#define LDO_VOL_CONTR_MASK 0x0f
92
93static const unsigned int ldo45_voltage_map[] = {
94 1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
95 1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
96};
97
98static const unsigned int ldo123_voltage_map[] = {
99 1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
100 2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
101};
102
103#define LDO_VOL_MIN_IDX 0x00
104#define LDO_VOL_MAX_IDX 0x0f
105
106static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
107{
108 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
109 int ldo = rdev_get_id(dev) - LP3971_LDO1;
110 u16 mask = 1 << (1 + ldo);
111 u16 val;
112
113 val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
114 return (val & mask) != 0;
115}
116
117static int lp3971_ldo_enable(struct regulator_dev *dev)
118{
119 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
120 int ldo = rdev_get_id(dev) - LP3971_LDO1;
121 u16 mask = 1 << (1 + ldo);
122
123 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
124}
125
126static int lp3971_ldo_disable(struct regulator_dev *dev)
127{
128 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
129 int ldo = rdev_get_id(dev) - LP3971_LDO1;
130 u16 mask = 1 << (1 + ldo);
131
132 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
133}
134
135static int lp3971_ldo_get_voltage_sel(struct regulator_dev *dev)
136{
137 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
138 int ldo = rdev_get_id(dev) - LP3971_LDO1;
139 u16 val, reg;
140
141 reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
142 val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
143
144 return val;
145}
146
147static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,
148 unsigned int selector)
149{
150 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
151 int ldo = rdev_get_id(dev) - LP3971_LDO1;
152
153 return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
154 LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
155 selector << LDO_VOL_CONTR_SHIFT(ldo));
156}
157
158static const struct regulator_ops lp3971_ldo_ops = {
159 .list_voltage = regulator_list_voltage_table,
160 .map_voltage = regulator_map_voltage_ascend,
161 .is_enabled = lp3971_ldo_is_enabled,
162 .enable = lp3971_ldo_enable,
163 .disable = lp3971_ldo_disable,
164 .get_voltage_sel = lp3971_ldo_get_voltage_sel,
165 .set_voltage_sel = lp3971_ldo_set_voltage_sel,
166};
167
168static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
169{
170 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
171 int buck = rdev_get_id(dev) - LP3971_DCDC1;
172 u16 mask = 1 << (buck * 2);
173 u16 val;
174
175 val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
176 return (val & mask) != 0;
177}
178
179static int lp3971_dcdc_enable(struct regulator_dev *dev)
180{
181 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
182 int buck = rdev_get_id(dev) - LP3971_DCDC1;
183 u16 mask = 1 << (buck * 2);
184
185 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
186}
187
188static int lp3971_dcdc_disable(struct regulator_dev *dev)
189{
190 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
191 int buck = rdev_get_id(dev) - LP3971_DCDC1;
192 u16 mask = 1 << (buck * 2);
193
194 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
195}
196
197static int lp3971_dcdc_get_voltage_sel(struct regulator_dev *dev)
198{
199 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
200 int buck = rdev_get_id(dev) - LP3971_DCDC1;
201 u16 reg;
202
203 reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
204 reg &= BUCK_TARGET_VOL_MASK;
205
206 return reg;
207}
208
209static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,
210 unsigned int selector)
211{
212 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
213 int buck = rdev_get_id(dev) - LP3971_DCDC1;
214 int ret;
215
216 ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
217 BUCK_TARGET_VOL_MASK, selector);
218 if (ret)
219 return ret;
220
221 ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
222 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
223 BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
224 if (ret)
225 return ret;
226
227 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
228 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
229 0 << BUCK_VOL_CHANGE_SHIFT(buck));
230}
231
232static const struct regulator_ops lp3971_dcdc_ops = {
233 .list_voltage = regulator_list_voltage_table,
234 .map_voltage = regulator_map_voltage_ascend,
235 .is_enabled = lp3971_dcdc_is_enabled,
236 .enable = lp3971_dcdc_enable,
237 .disable = lp3971_dcdc_disable,
238 .get_voltage_sel = lp3971_dcdc_get_voltage_sel,
239 .set_voltage_sel = lp3971_dcdc_set_voltage_sel,
240};
241
242static const struct regulator_desc regulators[] = {
243 {
244 .name = "LDO1",
245 .id = LP3971_LDO1,
246 .ops = &lp3971_ldo_ops,
247 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
248 .volt_table = ldo123_voltage_map,
249 .type = REGULATOR_VOLTAGE,
250 .owner = THIS_MODULE,
251 },
252 {
253 .name = "LDO2",
254 .id = LP3971_LDO2,
255 .ops = &lp3971_ldo_ops,
256 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
257 .volt_table = ldo123_voltage_map,
258 .type = REGULATOR_VOLTAGE,
259 .owner = THIS_MODULE,
260 },
261 {
262 .name = "LDO3",
263 .id = LP3971_LDO3,
264 .ops = &lp3971_ldo_ops,
265 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
266 .volt_table = ldo123_voltage_map,
267 .type = REGULATOR_VOLTAGE,
268 .owner = THIS_MODULE,
269 },
270 {
271 .name = "LDO4",
272 .id = LP3971_LDO4,
273 .ops = &lp3971_ldo_ops,
274 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
275 .volt_table = ldo45_voltage_map,
276 .type = REGULATOR_VOLTAGE,
277 .owner = THIS_MODULE,
278 },
279 {
280 .name = "LDO5",
281 .id = LP3971_LDO5,
282 .ops = &lp3971_ldo_ops,
283 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
284 .volt_table = ldo45_voltage_map,
285 .type = REGULATOR_VOLTAGE,
286 .owner = THIS_MODULE,
287 },
288 {
289 .name = "DCDC1",
290 .id = LP3971_DCDC1,
291 .ops = &lp3971_dcdc_ops,
292 .n_voltages = ARRAY_SIZE(buck_voltage_map),
293 .volt_table = buck_voltage_map,
294 .type = REGULATOR_VOLTAGE,
295 .owner = THIS_MODULE,
296 },
297 {
298 .name = "DCDC2",
299 .id = LP3971_DCDC2,
300 .ops = &lp3971_dcdc_ops,
301 .n_voltages = ARRAY_SIZE(buck_voltage_map),
302 .volt_table = buck_voltage_map,
303 .type = REGULATOR_VOLTAGE,
304 .owner = THIS_MODULE,
305 },
306 {
307 .name = "DCDC3",
308 .id = LP3971_DCDC3,
309 .ops = &lp3971_dcdc_ops,
310 .n_voltages = ARRAY_SIZE(buck_voltage_map),
311 .volt_table = buck_voltage_map,
312 .type = REGULATOR_VOLTAGE,
313 .owner = THIS_MODULE,
314 },
315};
316
317static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
318 u16 *dest)
319{
320 int ret;
321
322 if (count != 1)
323 return -EIO;
324 ret = i2c_smbus_read_byte_data(i2c, reg);
325 if (ret < 0)
326 return ret;
327
328 *dest = ret;
329 return 0;
330}
331
332static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
333 const u16 *src)
334{
335 if (count != 1)
336 return -EIO;
337 return i2c_smbus_write_byte_data(i2c, reg, *src);
338}
339
340static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
341{
342 u16 val = 0;
343
344 mutex_lock(&lp3971->io_lock);
345
346 lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
347
348 dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
349 (unsigned)val&0xff);
350
351 mutex_unlock(&lp3971->io_lock);
352
353 return val & 0xff;
354}
355
356static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
357{
358 u16 tmp;
359 int ret;
360
361 mutex_lock(&lp3971->io_lock);
362
363 ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
364 if (ret == 0) {
365 tmp = (tmp & ~mask) | val;
366 ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
367 dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
368 (unsigned)val&0xff);
369 }
370 mutex_unlock(&lp3971->io_lock);
371
372 return ret;
373}
374
375static int setup_regulators(struct lp3971 *lp3971,
376 struct lp3971_platform_data *pdata)
377{
378 int i, err;
379
380 /* Instantiate the regulators */
381 for (i = 0; i < pdata->num_regulators; i++) {
382 struct regulator_config config = { };
383 struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
384 struct regulator_dev *rdev;
385
386 config.dev = lp3971->dev;
387 config.init_data = reg->initdata;
388 config.driver_data = lp3971;
389
390 rdev = devm_regulator_register(lp3971->dev,
391 ®ulators[reg->id], &config);
392 if (IS_ERR(rdev)) {
393 err = PTR_ERR(rdev);
394 dev_err(lp3971->dev, "regulator init failed: %d\n",
395 err);
396 return err;
397 }
398 }
399
400 return 0;
401}
402
403static int lp3971_i2c_probe(struct i2c_client *i2c)
404{
405 struct lp3971 *lp3971;
406 struct lp3971_platform_data *pdata = dev_get_platdata(&i2c->dev);
407 int ret;
408 u16 val;
409
410 if (!pdata) {
411 dev_dbg(&i2c->dev, "No platform init data supplied\n");
412 return -ENODEV;
413 }
414
415 lp3971 = devm_kzalloc(&i2c->dev, sizeof(struct lp3971), GFP_KERNEL);
416 if (lp3971 == NULL)
417 return -ENOMEM;
418
419 lp3971->i2c = i2c;
420 lp3971->dev = &i2c->dev;
421
422 mutex_init(&lp3971->io_lock);
423
424 /* Detect LP3971 */
425 ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
426 if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
427 ret = -ENODEV;
428 if (ret < 0) {
429 dev_err(&i2c->dev, "failed to detect device\n");
430 return ret;
431 }
432
433 ret = setup_regulators(lp3971, pdata);
434 if (ret < 0)
435 return ret;
436
437 i2c_set_clientdata(i2c, lp3971);
438 return 0;
439}
440
441static const struct i2c_device_id lp3971_i2c_id[] = {
442 { "lp3971", 0 },
443 { }
444};
445MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
446
447static struct i2c_driver lp3971_i2c_driver = {
448 .driver = {
449 .name = "LP3971",
450 },
451 .probe_new = lp3971_i2c_probe,
452 .id_table = lp3971_i2c_id,
453};
454
455module_i2c_driver(lp3971_i2c_driver);
456
457MODULE_LICENSE("GPL");
458MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
459MODULE_DESCRIPTION("LP3971 PMIC driver");