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14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/i2c.h>
17#include <linux/err.h>
18#include <linux/irq.h>
19#include <linux/interrupt.h>
20#include <linux/gpio.h>
21#include <linux/regmap.h>
22#include <linux/delay.h>
23#include <linux/uaccess.h>
24#include <linux/regulator/driver.h>
25#include <linux/regulator/machine.h>
26#include <linux/platform_data/lp8755.h>
27
28#define LP8755_REG_BUCK0 0x00
29#define LP8755_REG_BUCK1 0x03
30#define LP8755_REG_BUCK2 0x04
31#define LP8755_REG_BUCK3 0x01
32#define LP8755_REG_BUCK4 0x05
33#define LP8755_REG_BUCK5 0x02
34#define LP8755_REG_MAX 0xFF
35
36#define LP8755_BUCK_EN_M BIT(7)
37#define LP8755_BUCK_LINEAR_OUT_MAX 0x76
38#define LP8755_BUCK_VOUT_M 0x7F
39
40struct lp8755_mphase {
41 int nreg;
42 int buck_num[LP8755_BUCK_MAX];
43};
44
45struct lp8755_chip {
46 struct device *dev;
47 struct regmap *regmap;
48 struct lp8755_platform_data *pdata;
49
50 int irq;
51 unsigned int irqmask;
52
53 int mphase;
54 struct regulator_dev *rdev[LP8755_BUCK_MAX];
55};
56
57
58
59
60
61
62
63static int lp8755_read(struct lp8755_chip *pchip, unsigned int reg,
64 unsigned int *val)
65{
66 return regmap_read(pchip->regmap, reg, val);
67}
68
69
70
71
72
73
74
75static int lp8755_write(struct lp8755_chip *pchip, unsigned int reg,
76 unsigned int val)
77{
78 return regmap_write(pchip->regmap, reg, val);
79}
80
81
82
83
84
85
86
87
88static int lp8755_update_bits(struct lp8755_chip *pchip, unsigned int reg,
89 unsigned int mask, unsigned int val)
90{
91 return regmap_update_bits(pchip->regmap, reg, mask, val);
92}
93
94static int lp8755_buck_enable_time(struct regulator_dev *rdev)
95{
96 int ret;
97 unsigned int regval;
98 enum lp8755_bucks id = rdev_get_id(rdev);
99 struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
100
101 ret = lp8755_read(pchip, 0x12 + id, ®val);
102 if (ret < 0) {
103 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
104 return ret;
105 }
106 return (regval & 0xff) * 100;
107}
108
109static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
110{
111 int ret;
112 unsigned int regbval = 0x0;
113 enum lp8755_bucks id = rdev_get_id(rdev);
114 struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
115
116 switch (mode) {
117 case REGULATOR_MODE_FAST:
118
119 regbval = (0x01 << id);
120 break;
121 case REGULATOR_MODE_NORMAL:
122
123 ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x00);
124 if (ret < 0)
125 goto err_i2c;
126 break;
127 case REGULATOR_MODE_IDLE:
128
129 ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x20);
130 if (ret < 0)
131 goto err_i2c;
132
133 ret = lp8755_update_bits(pchip, 0x10, 0x01, 0x01);
134 if (ret < 0)
135 goto err_i2c;
136 break;
137 default:
138 dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
139
140 regbval = (0x01 << id);
141 }
142
143 ret = lp8755_update_bits(pchip, 0x06, 0x01 << id, regbval);
144 if (ret < 0)
145 goto err_i2c;
146 return ret;
147err_i2c:
148 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
149 return ret;
150}
151
152static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
153{
154 int ret;
155 unsigned int regval;
156 enum lp8755_bucks id = rdev_get_id(rdev);
157 struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
158
159 ret = lp8755_read(pchip, 0x06, ®val);
160 if (ret < 0)
161 goto err_i2c;
162
163
164 if (regval & (0x01 << id))
165 return REGULATOR_MODE_FAST;
166
167 ret = lp8755_read(pchip, 0x08 + id, ®val);
168 if (ret < 0)
169 goto err_i2c;
170
171
172 if (regval & 0x20)
173 return REGULATOR_MODE_IDLE;
174
175
176 return REGULATOR_MODE_NORMAL;
177
178err_i2c:
179 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
180 return 0;
181}
182
183static int lp8755_buck_set_ramp(struct regulator_dev *rdev, int ramp)
184{
185 int ret;
186 unsigned int regval = 0x00;
187 enum lp8755_bucks id = rdev_get_id(rdev);
188 struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
189
190
191 switch (ramp) {
192 case 0 ... 230:
193 regval = 0x07;
194 break;
195 case 231 ... 470:
196 regval = 0x06;
197 break;
198 case 471 ... 940:
199 regval = 0x05;
200 break;
201 case 941 ... 1900:
202 regval = 0x04;
203 break;
204 case 1901 ... 3800:
205 regval = 0x03;
206 break;
207 case 3801 ... 7500:
208 regval = 0x02;
209 break;
210 case 7501 ... 15000:
211 regval = 0x01;
212 break;
213 case 15001 ... 30000:
214 regval = 0x00;
215 break;
216 default:
217 dev_err(pchip->dev,
218 "Not supported ramp value %d %s\n", ramp, __func__);
219 return -EINVAL;
220 }
221
222 ret = lp8755_update_bits(pchip, 0x07 + id, 0x07, regval);
223 if (ret < 0)
224 goto err_i2c;
225 return ret;
226err_i2c:
227 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
228 return ret;
229}
230
231static struct regulator_ops lp8755_buck_ops = {
232 .list_voltage = regulator_list_voltage_linear,
233 .set_voltage_sel = regulator_set_voltage_sel_regmap,
234 .get_voltage_sel = regulator_get_voltage_sel_regmap,
235 .enable = regulator_enable_regmap,
236 .disable = regulator_disable_regmap,
237 .is_enabled = regulator_is_enabled_regmap,
238 .enable_time = lp8755_buck_enable_time,
239 .set_mode = lp8755_buck_set_mode,
240 .get_mode = lp8755_buck_get_mode,
241 .set_ramp_delay = lp8755_buck_set_ramp,
242};
243
244#define lp8755_rail(_id) "lp8755_buck"#_id
245#define lp8755_buck_init(_id)\
246{\
247 .constraints = {\
248 .name = lp8755_rail(_id),\
249 .valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
250 .min_uV = 500000,\
251 .max_uV = 1675000,\
252 },\
253}
254
255static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
256 [LP8755_BUCK0] = lp8755_buck_init(0),
257 [LP8755_BUCK1] = lp8755_buck_init(1),
258 [LP8755_BUCK2] = lp8755_buck_init(2),
259 [LP8755_BUCK3] = lp8755_buck_init(3),
260 [LP8755_BUCK4] = lp8755_buck_init(4),
261 [LP8755_BUCK5] = lp8755_buck_init(5),
262};
263
264static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
265 { 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
266 { 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
267 LP8755_BUCK4, LP8755_BUCK5 } },
268 { 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
269 LP8755_BUCK5} },
270 { 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
271 { 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
272 { 2, { LP8755_BUCK0, LP8755_BUCK5} },
273 { 1, { LP8755_BUCK0} },
274 { 2, { LP8755_BUCK0, LP8755_BUCK3} },
275 { 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
276};
277
278static int lp8755_init_data(struct lp8755_chip *pchip)
279{
280 unsigned int regval;
281 int ret, icnt, buck_num;
282 struct lp8755_platform_data *pdata = pchip->pdata;
283
284
285 ret = lp8755_read(pchip, 0x3D, ®val);
286 if (ret < 0)
287 goto out_i2c_error;
288 pchip->mphase = regval & 0x0F;
289
290
291 for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
292 buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
293 pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
294 }
295 return ret;
296
297out_i2c_error:
298 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
299 return ret;
300}
301
302#define lp8755_buck_desc(_id)\
303{\
304 .name = lp8755_rail(_id),\
305 .id = LP8755_BUCK##_id,\
306 .ops = &lp8755_buck_ops,\
307 .n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
308 .uV_step = 10000,\
309 .min_uV = 500000,\
310 .type = REGULATOR_VOLTAGE,\
311 .owner = THIS_MODULE,\
312 .enable_reg = LP8755_REG_BUCK##_id,\
313 .enable_mask = LP8755_BUCK_EN_M,\
314 .vsel_reg = LP8755_REG_BUCK##_id,\
315 .vsel_mask = LP8755_BUCK_VOUT_M,\
316}
317
318static struct regulator_desc lp8755_regulators[] = {
319 lp8755_buck_desc(0),
320 lp8755_buck_desc(1),
321 lp8755_buck_desc(2),
322 lp8755_buck_desc(3),
323 lp8755_buck_desc(4),
324 lp8755_buck_desc(5),
325};
326
327static int lp8755_regulator_init(struct lp8755_chip *pchip)
328{
329 int ret, icnt, buck_num;
330 struct lp8755_platform_data *pdata = pchip->pdata;
331 struct regulator_config rconfig = { };
332
333 rconfig.regmap = pchip->regmap;
334 rconfig.dev = pchip->dev;
335 rconfig.driver_data = pchip;
336
337 for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
338 buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
339 rconfig.init_data = pdata->buck_data[buck_num];
340 rconfig.of_node = pchip->dev->of_node;
341 pchip->rdev[buck_num] =
342 regulator_register(&lp8755_regulators[buck_num], &rconfig);
343 if (IS_ERR(pchip->rdev[buck_num])) {
344 ret = PTR_ERR(pchip->rdev[buck_num]);
345 pchip->rdev[buck_num] = NULL;
346 dev_err(pchip->dev, "regulator init failed: buck %d\n",
347 buck_num);
348 goto err_buck;
349 }
350 }
351
352 return 0;
353
354err_buck:
355 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
356 regulator_unregister(pchip->rdev[icnt]);
357 return ret;
358}
359
360static irqreturn_t lp8755_irq_handler(int irq, void *data)
361{
362 int ret, icnt;
363 unsigned int flag0, flag1;
364 struct lp8755_chip *pchip = data;
365
366
367 ret = lp8755_read(pchip, 0x0D, &flag0);
368 if (ret < 0)
369 goto err_i2c;
370
371 ret = lp8755_write(pchip, 0x0D, 0x00);
372 if (ret < 0)
373 goto err_i2c;
374
375
376 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
377 if ((flag0 & (0x4 << icnt))
378 && (pchip->irqmask & (0x04 << icnt))
379 && (pchip->rdev[icnt] != NULL))
380 regulator_notifier_call_chain(pchip->rdev[icnt],
381 LP8755_EVENT_PWR_FAULT,
382 NULL);
383
384
385 ret = lp8755_read(pchip, 0x0E, &flag1);
386 if (ret < 0)
387 goto err_i2c;
388
389 ret = lp8755_write(pchip, 0x0E, 0x00);
390 if (ret < 0)
391 goto err_i2c;
392
393
394 if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
395 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
396 if (pchip->rdev[icnt] != NULL)
397 regulator_notifier_call_chain(pchip->rdev[icnt],
398 LP8755_EVENT_OCP,
399 NULL);
400
401
402 if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
403 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
404 if (pchip->rdev[icnt] != NULL)
405 regulator_notifier_call_chain(pchip->rdev[icnt],
406 LP8755_EVENT_OVP,
407 NULL);
408 return IRQ_HANDLED;
409
410err_i2c:
411 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
412 return IRQ_NONE;
413}
414
415static int lp8755_int_config(struct lp8755_chip *pchip)
416{
417 int ret;
418 unsigned int regval;
419
420 if (pchip->irq == 0) {
421 dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
422 return 0;
423 }
424
425 ret = lp8755_read(pchip, 0x0F, ®val);
426 if (ret < 0)
427 goto err_i2c;
428 pchip->irqmask = regval;
429 ret = request_threaded_irq(pchip->irq, NULL, lp8755_irq_handler,
430 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
431 "lp8755-irq", pchip);
432 if (ret)
433 return ret;
434
435 return ret;
436
437err_i2c:
438 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
439 return ret;
440}
441
442static const struct regmap_config lp8755_regmap = {
443 .reg_bits = 8,
444 .val_bits = 8,
445 .max_register = LP8755_REG_MAX,
446};
447
448static int lp8755_probe(struct i2c_client *client,
449 const struct i2c_device_id *id)
450{
451 int ret, icnt;
452 struct lp8755_chip *pchip;
453 struct lp8755_platform_data *pdata = client->dev.platform_data;
454
455 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
456 dev_err(&client->dev, "i2c functionality check fail.\n");
457 return -EOPNOTSUPP;
458 }
459
460 pchip = devm_kzalloc(&client->dev,
461 sizeof(struct lp8755_chip), GFP_KERNEL);
462 if (!pchip)
463 return -ENOMEM;
464
465 pchip->dev = &client->dev;
466 pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
467 if (IS_ERR(pchip->regmap)) {
468 ret = PTR_ERR(pchip->regmap);
469 dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
470 return ret;
471 }
472 i2c_set_clientdata(client, pchip);
473
474 if (pdata != NULL) {
475 pchip->pdata = pdata;
476 pchip->mphase = pdata->mphase;
477 } else {
478 pchip->pdata = devm_kzalloc(pchip->dev,
479 sizeof(struct lp8755_platform_data),
480 GFP_KERNEL);
481 if (!pchip->pdata)
482 return -ENOMEM;
483 ret = lp8755_init_data(pchip);
484 if (ret < 0) {
485 dev_err(&client->dev, "fail to initialize chip\n");
486 return ret;
487 }
488 }
489
490 ret = lp8755_regulator_init(pchip);
491 if (ret < 0) {
492 dev_err(&client->dev, "fail to initialize regulators\n");
493 goto err_regulator;
494 }
495
496 pchip->irq = client->irq;
497 ret = lp8755_int_config(pchip);
498 if (ret < 0) {
499 dev_err(&client->dev, "fail to irq config\n");
500 goto err_irq;
501 }
502
503 return ret;
504
505err_irq:
506 for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++)
507 regulator_unregister(pchip->rdev[icnt]);
508
509err_regulator:
510
511 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
512 lp8755_write(pchip, icnt, 0x00);
513
514 return ret;
515}
516
517static int lp8755_remove(struct i2c_client *client)
518{
519 int icnt;
520 struct lp8755_chip *pchip = i2c_get_clientdata(client);
521
522 for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++)
523 regulator_unregister(pchip->rdev[icnt]);
524
525 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
526 lp8755_write(pchip, icnt, 0x00);
527
528 if (pchip->irq != 0)
529 free_irq(pchip->irq, pchip);
530
531 return 0;
532}
533
534static const struct i2c_device_id lp8755_id[] = {
535 {LP8755_NAME, 0},
536 {}
537};
538
539MODULE_DEVICE_TABLE(i2c, lp8755_id);
540
541static struct i2c_driver lp8755_i2c_driver = {
542 .driver = {
543 .name = LP8755_NAME,
544 },
545 .probe = lp8755_probe,
546 .remove = lp8755_remove,
547 .id_table = lp8755_id,
548};
549
550static int __init lp8755_init(void)
551{
552 return i2c_add_driver(&lp8755_i2c_driver);
553}
554
555subsys_initcall(lp8755_init);
556
557static void __exit lp8755_exit(void)
558{
559 i2c_del_driver(&lp8755_i2c_driver);
560}
561
562module_exit(lp8755_exit);
563
564MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
565MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
566MODULE_LICENSE("GPL v2");
567
