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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/module.h>
20#include <linux/regulator/driver.h>
21#include <linux/regulator/lp3971.h>
22#include <linux/slab.h>
23
24struct lp3971 {
25 struct device *dev;
26 struct mutex io_lock;
27 struct i2c_client *i2c;
28 int num_regulators;
29 struct regulator_dev **rdev;
30};
31
32static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
33static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);
34
35#define LP3971_SYS_CONTROL1_REG 0x07
36
37
38
39#define SYS_CONTROL1_INIT_VAL 0x40
40#define SYS_CONTROL1_INIT_MASK 0xCF
41
42#define LP3971_BUCK_VOL_ENABLE_REG 0x10
43#define LP3971_BUCK_VOL_CHANGE_REG 0x20
44
45
46
47
48
49
50#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01))
51#define BUCK_VOL_CHANGE_FLAG_GO 0x01
52#define BUCK_VOL_CHANGE_FLAG_TARGET 0x02
53#define BUCK_VOL_CHANGE_FLAG_MASK 0x03
54
55#define LP3971_BUCK1_BASE 0x23
56#define LP3971_BUCK2_BASE 0x29
57#define LP3971_BUCK3_BASE 0x32
58
59static const int buck_base_addr[] = {
60 LP3971_BUCK1_BASE,
61 LP3971_BUCK2_BASE,
62 LP3971_BUCK3_BASE,
63};
64
65#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])
66#define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)
67
68static const int buck_voltage_map[] = {
69 0, 800, 850, 900, 950, 1000, 1050, 1100,
70 1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500,
71 1550, 1600, 1650, 1700, 1800, 1900, 2500, 2800,
72 3000, 3300,
73};
74
75#define BUCK_TARGET_VOL_MASK 0x3f
76#define BUCK_TARGET_VOL_MIN_IDX 0x01
77#define BUCK_TARGET_VOL_MAX_IDX 0x19
78
79#define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
80
81#define LP3971_LDO_ENABLE_REG 0x12
82#define LP3971_LDO_VOL_CONTR_BASE 0x39
83
84
85
86
87
88
89
90
91#define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
92
93
94
95
96
97
98#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
99#define LDO_VOL_CONTR_MASK 0x0f
100
101static const int ldo45_voltage_map[] = {
102 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350,
103 1400, 1500, 1800, 1900, 2500, 2800, 3000, 3300,
104};
105
106static const int ldo123_voltage_map[] = {
107 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500,
108 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300,
109};
110
111static const int *ldo_voltage_map[] = {
112 ldo123_voltage_map,
113 ldo123_voltage_map,
114 ldo123_voltage_map,
115 ldo45_voltage_map,
116 ldo45_voltage_map,
117};
118
119#define LDO_VOL_VALUE_MAP(x) (ldo_voltage_map[(x - LP3971_LDO1)])
120
121#define LDO_VOL_MIN_IDX 0x00
122#define LDO_VOL_MAX_IDX 0x0f
123
124static int lp3971_ldo_list_voltage(struct regulator_dev *dev, unsigned index)
125{
126 int ldo = rdev_get_id(dev) - LP3971_LDO1;
127 return 1000 * LDO_VOL_VALUE_MAP(ldo)[index];
128}
129
130static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
131{
132 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
133 int ldo = rdev_get_id(dev) - LP3971_LDO1;
134 u16 mask = 1 << (1 + ldo);
135 u16 val;
136
137 val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
138 return (val & mask) != 0;
139}
140
141static int lp3971_ldo_enable(struct regulator_dev *dev)
142{
143 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
144 int ldo = rdev_get_id(dev) - LP3971_LDO1;
145 u16 mask = 1 << (1 + ldo);
146
147 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
148}
149
150static int lp3971_ldo_disable(struct regulator_dev *dev)
151{
152 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
153 int ldo = rdev_get_id(dev) - LP3971_LDO1;
154 u16 mask = 1 << (1 + ldo);
155
156 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
157}
158
159static int lp3971_ldo_get_voltage(struct regulator_dev *dev)
160{
161 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
162 int ldo = rdev_get_id(dev) - LP3971_LDO1;
163 u16 val, reg;
164
165 reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
166 val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
167
168 return 1000 * LDO_VOL_VALUE_MAP(ldo)[val];
169}
170
171static int lp3971_ldo_set_voltage(struct regulator_dev *dev,
172 int min_uV, int max_uV,
173 unsigned int *selector)
174{
175 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
176 int ldo = rdev_get_id(dev) - LP3971_LDO1;
177 int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
178 const int *vol_map = LDO_VOL_VALUE_MAP(ldo);
179 u16 val;
180
181 if (min_vol < vol_map[LDO_VOL_MIN_IDX] ||
182 min_vol > vol_map[LDO_VOL_MAX_IDX])
183 return -EINVAL;
184
185 for (val = LDO_VOL_MIN_IDX; val <= LDO_VOL_MAX_IDX; val++)
186 if (vol_map[val] >= min_vol)
187 break;
188
189 if (val > LDO_VOL_MAX_IDX || vol_map[val] > max_vol)
190 return -EINVAL;
191
192 *selector = val;
193
194 return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
195 LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
196 val << LDO_VOL_CONTR_SHIFT(ldo));
197}
198
199static struct regulator_ops lp3971_ldo_ops = {
200 .list_voltage = lp3971_ldo_list_voltage,
201 .is_enabled = lp3971_ldo_is_enabled,
202 .enable = lp3971_ldo_enable,
203 .disable = lp3971_ldo_disable,
204 .get_voltage = lp3971_ldo_get_voltage,
205 .set_voltage = lp3971_ldo_set_voltage,
206};
207
208static int lp3971_dcdc_list_voltage(struct regulator_dev *dev, unsigned index)
209{
210 return 1000 * buck_voltage_map[index];
211}
212
213static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
214{
215 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
216 int buck = rdev_get_id(dev) - LP3971_DCDC1;
217 u16 mask = 1 << (buck * 2);
218 u16 val;
219
220 val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
221 return (val & mask) != 0;
222}
223
224static int lp3971_dcdc_enable(struct regulator_dev *dev)
225{
226 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
227 int buck = rdev_get_id(dev) - LP3971_DCDC1;
228 u16 mask = 1 << (buck * 2);
229
230 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
231}
232
233static int lp3971_dcdc_disable(struct regulator_dev *dev)
234{
235 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
236 int buck = rdev_get_id(dev) - LP3971_DCDC1;
237 u16 mask = 1 << (buck * 2);
238
239 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
240}
241
242static int lp3971_dcdc_get_voltage(struct regulator_dev *dev)
243{
244 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
245 int buck = rdev_get_id(dev) - LP3971_DCDC1;
246 u16 reg;
247 int val;
248
249 reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
250 reg &= BUCK_TARGET_VOL_MASK;
251
252 if (reg <= BUCK_TARGET_VOL_MAX_IDX)
253 val = 1000 * buck_voltage_map[reg];
254 else {
255 val = 0;
256 dev_warn(&dev->dev, "chip reported incorrect voltage value.\n");
257 }
258
259 return val;
260}
261
262static int lp3971_dcdc_set_voltage(struct regulator_dev *dev,
263 int min_uV, int max_uV,
264 unsigned int *selector)
265{
266 struct lp3971 *lp3971 = rdev_get_drvdata(dev);
267 int buck = rdev_get_id(dev) - LP3971_DCDC1;
268 int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
269 const int *vol_map = buck_voltage_map;
270 u16 val;
271 int ret;
272
273 if (min_vol < vol_map[BUCK_TARGET_VOL_MIN_IDX] ||
274 min_vol > vol_map[BUCK_TARGET_VOL_MAX_IDX])
275 return -EINVAL;
276
277 for (val = BUCK_TARGET_VOL_MIN_IDX; val <= BUCK_TARGET_VOL_MAX_IDX;
278 val++)
279 if (vol_map[val] >= min_vol)
280 break;
281
282 if (val > BUCK_TARGET_VOL_MAX_IDX || vol_map[val] > max_vol)
283 return -EINVAL;
284
285 *selector = val;
286
287 ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
288 BUCK_TARGET_VOL_MASK, val);
289 if (ret)
290 return ret;
291
292 ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
293 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
294 BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
295 if (ret)
296 return ret;
297
298 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
299 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
300 0 << BUCK_VOL_CHANGE_SHIFT(buck));
301}
302
303static struct regulator_ops lp3971_dcdc_ops = {
304 .list_voltage = lp3971_dcdc_list_voltage,
305 .is_enabled = lp3971_dcdc_is_enabled,
306 .enable = lp3971_dcdc_enable,
307 .disable = lp3971_dcdc_disable,
308 .get_voltage = lp3971_dcdc_get_voltage,
309 .set_voltage = lp3971_dcdc_set_voltage,
310};
311
312static struct regulator_desc regulators[] = {
313 {
314 .name = "LDO1",
315 .id = LP3971_LDO1,
316 .ops = &lp3971_ldo_ops,
317 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
318 .type = REGULATOR_VOLTAGE,
319 .owner = THIS_MODULE,
320 },
321 {
322 .name = "LDO2",
323 .id = LP3971_LDO2,
324 .ops = &lp3971_ldo_ops,
325 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
326 .type = REGULATOR_VOLTAGE,
327 .owner = THIS_MODULE,
328 },
329 {
330 .name = "LDO3",
331 .id = LP3971_LDO3,
332 .ops = &lp3971_ldo_ops,
333 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),
334 .type = REGULATOR_VOLTAGE,
335 .owner = THIS_MODULE,
336 },
337 {
338 .name = "LDO4",
339 .id = LP3971_LDO4,
340 .ops = &lp3971_ldo_ops,
341 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
342 .type = REGULATOR_VOLTAGE,
343 .owner = THIS_MODULE,
344 },
345 {
346 .name = "LDO5",
347 .id = LP3971_LDO5,
348 .ops = &lp3971_ldo_ops,
349 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),
350 .type = REGULATOR_VOLTAGE,
351 .owner = THIS_MODULE,
352 },
353 {
354 .name = "DCDC1",
355 .id = LP3971_DCDC1,
356 .ops = &lp3971_dcdc_ops,
357 .n_voltages = ARRAY_SIZE(buck_voltage_map),
358 .type = REGULATOR_VOLTAGE,
359 .owner = THIS_MODULE,
360 },
361 {
362 .name = "DCDC2",
363 .id = LP3971_DCDC2,
364 .ops = &lp3971_dcdc_ops,
365 .n_voltages = ARRAY_SIZE(buck_voltage_map),
366 .type = REGULATOR_VOLTAGE,
367 .owner = THIS_MODULE,
368 },
369 {
370 .name = "DCDC3",
371 .id = LP3971_DCDC3,
372 .ops = &lp3971_dcdc_ops,
373 .n_voltages = ARRAY_SIZE(buck_voltage_map),
374 .type = REGULATOR_VOLTAGE,
375 .owner = THIS_MODULE,
376 },
377};
378
379static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
380 u16 *dest)
381{
382 int ret;
383
384 if (count != 1)
385 return -EIO;
386 ret = i2c_smbus_read_byte_data(i2c, reg);
387 if (ret < 0)
388 return -EIO;
389
390 *dest = ret;
391 return 0;
392}
393
394static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
395 const u16 *src)
396{
397 if (count != 1)
398 return -EIO;
399 return i2c_smbus_write_byte_data(i2c, reg, *src);
400}
401
402static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
403{
404 u16 val = 0;
405
406 mutex_lock(&lp3971->io_lock);
407
408 lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
409
410 dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
411 (unsigned)val&0xff);
412
413 mutex_unlock(&lp3971->io_lock);
414
415 return val & 0xff;
416}
417
418static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
419{
420 u16 tmp;
421 int ret;
422
423 mutex_lock(&lp3971->io_lock);
424
425 ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
426 tmp = (tmp & ~mask) | val;
427 if (ret == 0) {
428 ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
429 dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
430 (unsigned)val&0xff);
431 }
432 mutex_unlock(&lp3971->io_lock);
433
434 return ret;
435}
436
437static int __devinit setup_regulators(struct lp3971 *lp3971,
438 struct lp3971_platform_data *pdata)
439{
440 int i, err;
441
442 lp3971->num_regulators = pdata->num_regulators;
443 lp3971->rdev = kcalloc(pdata->num_regulators,
444 sizeof(struct regulator_dev *), GFP_KERNEL);
445 if (!lp3971->rdev) {
446 err = -ENOMEM;
447 goto err_nomem;
448 }
449
450
451 for (i = 0; i < pdata->num_regulators; i++) {
452 struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
453 lp3971->rdev[i] = regulator_register(®ulators[reg->id],
454 lp3971->dev, reg->initdata, lp3971, NULL);
455
456 if (IS_ERR(lp3971->rdev[i])) {
457 err = PTR_ERR(lp3971->rdev[i]);
458 dev_err(lp3971->dev, "regulator init failed: %d\n",
459 err);
460 goto error;
461 }
462 }
463
464 return 0;
465
466error:
467 while (--i >= 0)
468 regulator_unregister(lp3971->rdev[i]);
469 kfree(lp3971->rdev);
470 lp3971->rdev = NULL;
471err_nomem:
472 return err;
473}
474
475static int __devinit lp3971_i2c_probe(struct i2c_client *i2c,
476 const struct i2c_device_id *id)
477{
478 struct lp3971 *lp3971;
479 struct lp3971_platform_data *pdata = i2c->dev.platform_data;
480 int ret;
481 u16 val;
482
483 if (!pdata) {
484 dev_dbg(&i2c->dev, "No platform init data supplied\n");
485 return -ENODEV;
486 }
487
488 lp3971 = kzalloc(sizeof(struct lp3971), GFP_KERNEL);
489 if (lp3971 == NULL)
490 return -ENOMEM;
491
492 lp3971->i2c = i2c;
493 lp3971->dev = &i2c->dev;
494
495 mutex_init(&lp3971->io_lock);
496
497
498 ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
499 if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
500 ret = -ENODEV;
501 if (ret < 0) {
502 dev_err(&i2c->dev, "failed to detect device\n");
503 goto err_detect;
504 }
505
506 ret = setup_regulators(lp3971, pdata);
507 if (ret < 0)
508 goto err_detect;
509
510 i2c_set_clientdata(i2c, lp3971);
511 return 0;
512
513err_detect:
514 kfree(lp3971);
515 return ret;
516}
517
518static int __devexit lp3971_i2c_remove(struct i2c_client *i2c)
519{
520 struct lp3971 *lp3971 = i2c_get_clientdata(i2c);
521 int i;
522
523 for (i = 0; i < lp3971->num_regulators; i++)
524 regulator_unregister(lp3971->rdev[i]);
525
526 kfree(lp3971->rdev);
527 kfree(lp3971);
528
529 return 0;
530}
531
532static const struct i2c_device_id lp3971_i2c_id[] = {
533 { "lp3971", 0 },
534 { }
535};
536MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
537
538static struct i2c_driver lp3971_i2c_driver = {
539 .driver = {
540 .name = "LP3971",
541 .owner = THIS_MODULE,
542 },
543 .probe = lp3971_i2c_probe,
544 .remove = __devexit_p(lp3971_i2c_remove),
545 .id_table = lp3971_i2c_id,
546};
547
548static int __init lp3971_module_init(void)
549{
550 int ret;
551
552 ret = i2c_add_driver(&lp3971_i2c_driver);
553 if (ret != 0)
554 pr_err("Failed to register I2C driver: %d\n", ret);
555
556 return ret;
557}
558module_init(lp3971_module_init);
559
560static void __exit lp3971_module_exit(void)
561{
562 i2c_del_driver(&lp3971_i2c_driver);
563}
564module_exit(lp3971_module_exit);
565
566MODULE_LICENSE("GPL");
567MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
568MODULE_DESCRIPTION("LP3971 PMIC driver");
569
