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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
37
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
45
46
47
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
84
85
86
87
88
89
90#define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
91
92
93
94
95
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,
112 ldo123_voltage_map,
113 ldo123_voltage_map,
114 ldo45_voltage_map,
115 ldo45_voltage_map,
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{
173 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
174 int ldo = rdev_get_id(dev) - LP3971_LDO1;
175 int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
176 const int *vol_map = LDO_VOL_VALUE_MAP(ldo);
177 u16 val;
178
179 if (min_vol < vol_map[LDO_VOL_MIN_IDX] ||
180 min_vol > vol_map[LDO_VOL_MAX_IDX])
181 return -EINVAL;
182
183 for (val = LDO_VOL_MIN_IDX; val <= LDO_VOL_MAX_IDX; val++)
184 if (vol_map[val] >= min_vol)
185 break;
186
187 if (val > LDO_VOL_MAX_IDX || vol_map[val] > max_vol)
188 return -EINVAL;
189
190 return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
191 LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
192 val << LDO_VOL_CONTR_SHIFT(ldo));
193}
194
195static struct regulator_ops lp3971_ldo_ops = {
196 .list_voltage = lp3971_ldo_list_voltage,
197 .is_enabled = lp3971_ldo_is_enabled,
198 .enable = lp3971_ldo_enable,
199 .disable = lp3971_ldo_disable,
200 .get_voltage = lp3971_ldo_get_voltage,
201 .set_voltage = lp3971_ldo_set_voltage,
202};
203
204static int lp3971_dcdc_list_voltage(struct regulator_dev *dev, unsigned index)
205{
206 return 1000 * buck_voltage_map[index];
207}
208
209static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
210{
211 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
212 int buck = rdev_get_id(dev) - LP3971_DCDC1;
213 u16 mask = 1 << (buck * 2);
214 u16 val;
215
216 val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
217 return (val & mask) != 0;
218}
219
220static int lp3971_dcdc_enable(struct regulator_dev *dev)
221{
222 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
223 int buck = rdev_get_id(dev) - LP3971_DCDC1;
224 u16 mask = 1 << (buck * 2);
225
226 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
227}
228
229static int lp3971_dcdc_disable(struct regulator_dev *dev)
230{
231 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
232 int buck = rdev_get_id(dev) - LP3971_DCDC1;
233 u16 mask = 1 << (buck * 2);
234
235 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
236}
237
238static int lp3971_dcdc_get_voltage(struct regulator_dev *dev)
239{
240 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
241 int buck = rdev_get_id(dev) - LP3971_DCDC1;
242 u16 reg;
243 int val;
244
245 reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
246 reg &= BUCK_TARGET_VOL_MASK;
247
248 if (reg <= BUCK_TARGET_VOL_MAX_IDX)
249 val = 1000 * buck_voltage_map[reg];
250 else {
251 val = 0;
252 dev_warn(&dev->dev, "chip reported incorrect voltage value.\n");
253 }
254
255 return val;
256}
257
258static int lp3971_dcdc_set_voltage(struct regulator_dev *dev,
259 int min_uV, int max_uV)
260{
261 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
262 int buck = rdev_get_id(dev) - LP3971_DCDC1;
263 int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
264 const int *vol_map = buck_voltage_map;
265 u16 val;
266 int ret;
267
268 if (min_vol < vol_map[BUCK_TARGET_VOL_MIN_IDX] ||
269 min_vol > vol_map[BUCK_TARGET_VOL_MAX_IDX])
270 return -EINVAL;
271
272 for (val = BUCK_TARGET_VOL_MIN_IDX; val <= BUCK_TARGET_VOL_MAX_IDX;
273 val++)
274 if (vol_map[val] >= min_vol)
275 break;
276
277 if (val > BUCK_TARGET_VOL_MAX_IDX || vol_map[val] > max_vol)
278 return -EINVAL;
279
280 ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
281 BUCK_TARGET_VOL_MASK, val);
282 if (ret)
283 return ret;
284
285 ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
286 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
287 BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
288 if (ret)
289 return ret;
290
291 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
292 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
293 0 << BUCK_VOL_CHANGE_SHIFT(buck));
294}
295
296static struct regulator_ops lp3971_dcdc_ops = {
297 .list_voltage = lp3971_dcdc_list_voltage,
298 .is_enabled = lp3971_dcdc_is_enabled,
299 .enable = lp3971_dcdc_enable,
300 .disable = lp3971_dcdc_disable,
301 .get_voltage = lp3971_dcdc_get_voltage,
302 .set_voltage = lp3971_dcdc_set_voltage,
303};
304
305static struct regulator_desc regulators[] = {
306 {
307 .name = "LDO1",
308 .id = LP3971_LDO1,
309 .ops = &lp3971_ldo_ops,
310 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
311 .type = REGULATOR_VOLTAGE,
312 .owner = THIS_MODULE,
313 },
314 {
315 .name = "LDO2",
316 .id = LP3971_LDO2,
317 .ops = &lp3971_ldo_ops,
318 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
319 .type = REGULATOR_VOLTAGE,
320 .owner = THIS_MODULE,
321 },
322 {
323 .name = "LDO3",
324 .id = LP3971_LDO3,
325 .ops = &lp3971_ldo_ops,
326 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
327 .type = REGULATOR_VOLTAGE,
328 .owner = THIS_MODULE,
329 },
330 {
331 .name = "LDO4",
332 .id = LP3971_LDO4,
333 .ops = &lp3971_ldo_ops,
334 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
335 .type = REGULATOR_VOLTAGE,
336 .owner = THIS_MODULE,
337 },
338 {
339 .name = "LDO5",
340 .id = LP3971_LDO5,
341 .ops = &lp3971_ldo_ops,
342 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
343 .type = REGULATOR_VOLTAGE,
344 .owner = THIS_MODULE,
345 },
346 {
347 .name = "DCDC1",
348 .id = LP3971_DCDC1,
349 .ops = &lp3971_dcdc_ops,
350 .n_voltages = ARRAY_SIZE(buck_voltage_map),
351 .type = REGULATOR_VOLTAGE,
352 .owner = THIS_MODULE,
353 },
354 {
355 .name = "DCDC2",
356 .id = LP3971_DCDC2,
357 .ops = &lp3971_dcdc_ops,
358 .n_voltages = ARRAY_SIZE(buck_voltage_map),
359 .type = REGULATOR_VOLTAGE,
360 .owner = THIS_MODULE,
361 },
362 {
363 .name = "DCDC3",
364 .id = LP3971_DCDC3,
365 .ops = &lp3971_dcdc_ops,
366 .n_voltages = ARRAY_SIZE(buck_voltage_map),
367 .type = REGULATOR_VOLTAGE,
368 .owner = THIS_MODULE,
369 },
370};
371
372static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
373 u16 *dest)
374{
375 int ret;
376
377 if (count != 1)
378 return -EIO;
379 ret = i2c_smbus_read_byte_data(i2c, reg);
380 if (ret < 0)
381 return -EIO;
382
383 *dest = ret;
384 return 0;
385}
386
387static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
388 const u16 *src)
389{
390 if (count != 1)
391 return -EIO;
392 return i2c_smbus_write_byte_data(i2c, reg, *src);
393}
394
395static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
396{
397 u16 val = 0;
398
399 mutex_lock(&lp3971->io_lock);
400
401 lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
402
403 dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
404 (unsigned)val&0xff);
405
406 mutex_unlock(&lp3971->io_lock);
407
408 return val & 0xff;
409}
410
411static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
412{
413 u16 tmp;
414 int ret;
415
416 mutex_lock(&lp3971->io_lock);
417
418 ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
419 tmp = (tmp & ~mask) | val;
420 if (ret == 0) {
421 ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
422 dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
423 (unsigned)val&0xff);
424 }
425 mutex_unlock(&lp3971->io_lock);
426
427 return ret;
428}
429
430static int __devinit setup_regulators(struct lp3971 *lp3971,
431 struct lp3971_platform_data *pdata)
432{
433 int i, err;
434
435 lp3971->num_regulators = pdata->num_regulators;
436 lp3971->rdev = kcalloc(pdata->num_regulators,
437 sizeof(struct regulator_dev *), GFP_KERNEL);
438 if (!lp3971->rdev) {
439 err = -ENOMEM;
440 goto err_nomem;
441 }
442
443
444 for (i = 0; i < pdata->num_regulators; i++) {
445 struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
446 lp3971->rdev[i] = regulator_register(®ulators[reg->id],
447 lp3971->dev, reg->initdata, lp3971);
448
449 if (IS_ERR(lp3971->rdev[i])) {
450 err = PTR_ERR(lp3971->rdev[i]);
451 dev_err(lp3971->dev, "regulator init failed: %d\n",
452 err);
453 goto error;
454 }
455 }
456
457 return 0;
458
459error:
460 while (--i >= 0)
461 regulator_unregister(lp3971->rdev[i]);
462 kfree(lp3971->rdev);
463 lp3971->rdev = NULL;
464err_nomem:
465 return err;
466}
467
468static int __devinit lp3971_i2c_probe(struct i2c_client *i2c,
469 const struct i2c_device_id *id)
470{
471 struct lp3971 *lp3971;
472 struct lp3971_platform_data *pdata = i2c->dev.platform_data;
473 int ret;
474 u16 val;
475
476 if (!pdata) {
477 dev_dbg(&i2c->dev, "No platform init data supplied\n");
478 return -ENODEV;
479 }
480
481 lp3971 = kzalloc(sizeof(struct lp3971), GFP_KERNEL);
482 if (lp3971 == NULL)
483 return -ENOMEM;
484
485 lp3971->i2c = i2c;
486 lp3971->dev = &i2c->dev;
487
488 mutex_init(&lp3971->io_lock);
489
490
491 ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
492 if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
493 ret = -ENODEV;
494 if (ret < 0) {
495 dev_err(&i2c->dev, "failed to detect device\n");
496 goto err_detect;
497 }
498
499 ret = setup_regulators(lp3971, pdata);
500 if (ret < 0)
501 goto err_detect;
502
503 i2c_set_clientdata(i2c, lp3971);
504 return 0;
505
506err_detect:
507 kfree(lp3971);
508 return ret;
509}
510
511static int __devexit lp3971_i2c_remove(struct i2c_client *i2c)
512{
513 struct lp3971 *lp3971 = i2c_get_clientdata(i2c);
514 int i;
515
516 for (i = 0; i < lp3971->num_regulators; i++)
517 regulator_unregister(lp3971->rdev[i]);
518
519 kfree(lp3971->rdev);
520 kfree(lp3971);
521
522 return 0;
523}
524
525static const struct i2c_device_id lp3971_i2c_id[] = {
526 { "lp3971", 0 },
527 { }
528};
529MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
530
531static struct i2c_driver lp3971_i2c_driver = {
532 .driver = {
533 .name = "LP3971",
534 .owner = THIS_MODULE,
535 },
536 .probe = lp3971_i2c_probe,
537 .remove = __devexit_p(lp3971_i2c_remove),
538 .id_table = lp3971_i2c_id,
539};
540
541static int __init lp3971_module_init(void)
542{
543 int ret;
544
545 ret = i2c_add_driver(&lp3971_i2c_driver);
546 if (ret != 0)
547 pr_err("Failed to register I2C driver: %d\n", ret);
548
549 return ret;
550}
551module_init(lp3971_module_init);
552
553static void __exit lp3971_module_exit(void)
554{
555 i2c_del_driver(&lp3971_i2c_driver);
556}
557module_exit(lp3971_module_exit);
558
559MODULE_LICENSE("GPL");
560MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
561MODULE_DESCRIPTION("LP3971 PMIC driver");
562
