1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * LP8755 High Performance Power Management Unit : System Interface Driver
4 * (based on rev. 0.26)
5 * Copyright 2012 Texas Instruments
6 *
7 * Author: Daniel(Geon Si) Jeong <daniel.jeong@ti.com>
8 */
9
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/i2c.h>
13 #include <linux/err.h>
14 #include <linux/irq.h>
15 #include <linux/interrupt.h>
16 #include <linux/gpio.h>
17 #include <linux/regmap.h>
18 #include <linux/uaccess.h>
19 #include <linux/regulator/driver.h>
20 #include <linux/regulator/machine.h>
21 #include <linux/platform_data/lp8755.h>
22
23 #define LP8755_REG_BUCK0 0x00
24 #define LP8755_REG_BUCK1 0x03
25 #define LP8755_REG_BUCK2 0x04
26 #define LP8755_REG_BUCK3 0x01
27 #define LP8755_REG_BUCK4 0x05
28 #define LP8755_REG_BUCK5 0x02
29 #define LP8755_REG_MAX 0xFF
30
31 #define LP8755_BUCK_EN_M BIT(7)
32 #define LP8755_BUCK_LINEAR_OUT_MAX 0x76
33 #define LP8755_BUCK_VOUT_M 0x7F
34
35 struct lp8755_mphase {
36 int nreg;
37 int buck_num[LP8755_BUCK_MAX];
38 };
39
40 struct lp8755_chip {
41 struct device *dev;
42 struct regmap *regmap;
43 struct lp8755_platform_data *pdata;
44
45 int irq;
46 unsigned int irqmask;
47
48 int mphase;
49 struct regulator_dev *rdev[LP8755_BUCK_MAX];
50 };
51
lp8755_buck_enable_time(struct regulator_dev * rdev)52 static int lp8755_buck_enable_time(struct regulator_dev *rdev)
53 {
54 int ret;
55 unsigned int regval;
56 enum lp8755_bucks id = rdev_get_id(rdev);
57
58 ret = regmap_read(rdev->regmap, 0x12 + id, ®val);
59 if (ret < 0) {
60 dev_err(&rdev->dev, "i2c access error %s\n", __func__);
61 return ret;
62 }
63 return (regval & 0xff) * 100;
64 }
65
lp8755_buck_set_mode(struct regulator_dev * rdev,unsigned int mode)66 static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
67 {
68 int ret;
69 unsigned int regbval = 0x0;
70 enum lp8755_bucks id = rdev_get_id(rdev);
71 struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
72
73 switch (mode) {
74 case REGULATOR_MODE_FAST:
75 /* forced pwm mode */
76 regbval = (0x01 << id);
77 break;
78 case REGULATOR_MODE_NORMAL:
79 /* enable automatic pwm/pfm mode */
80 ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x00);
81 if (ret < 0)
82 goto err_i2c;
83 break;
84 case REGULATOR_MODE_IDLE:
85 /* enable automatic pwm/pfm/lppfm mode */
86 ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x20);
87 if (ret < 0)
88 goto err_i2c;
89
90 ret = regmap_update_bits(rdev->regmap, 0x10, 0x01, 0x01);
91 if (ret < 0)
92 goto err_i2c;
93 break;
94 default:
95 dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
96 /* forced pwm mode */
97 regbval = (0x01 << id);
98 }
99
100 ret = regmap_update_bits(rdev->regmap, 0x06, 0x01 << id, regbval);
101 if (ret < 0)
102 goto err_i2c;
103 return ret;
104 err_i2c:
105 dev_err(&rdev->dev, "i2c access error %s\n", __func__);
106 return ret;
107 }
108
lp8755_buck_get_mode(struct regulator_dev * rdev)109 static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
110 {
111 int ret;
112 unsigned int regval;
113 enum lp8755_bucks id = rdev_get_id(rdev);
114
115 ret = regmap_read(rdev->regmap, 0x06, ®val);
116 if (ret < 0)
117 goto err_i2c;
118
119 /* mode fast means forced pwm mode */
120 if (regval & (0x01 << id))
121 return REGULATOR_MODE_FAST;
122
123 ret = regmap_read(rdev->regmap, 0x08 + id, ®val);
124 if (ret < 0)
125 goto err_i2c;
126
127 /* mode idle means automatic pwm/pfm/lppfm mode */
128 if (regval & 0x20)
129 return REGULATOR_MODE_IDLE;
130
131 /* mode normal means automatic pwm/pfm mode */
132 return REGULATOR_MODE_NORMAL;
133
134 err_i2c:
135 dev_err(&rdev->dev, "i2c access error %s\n", __func__);
136 return 0;
137 }
138
lp8755_buck_set_ramp(struct regulator_dev * rdev,int ramp)139 static int lp8755_buck_set_ramp(struct regulator_dev *rdev, int ramp)
140 {
141 int ret;
142 unsigned int regval = 0x00;
143 enum lp8755_bucks id = rdev_get_id(rdev);
144
145 /* uV/us */
146 switch (ramp) {
147 case 0 ... 230:
148 regval = 0x07;
149 break;
150 case 231 ... 470:
151 regval = 0x06;
152 break;
153 case 471 ... 940:
154 regval = 0x05;
155 break;
156 case 941 ... 1900:
157 regval = 0x04;
158 break;
159 case 1901 ... 3800:
160 regval = 0x03;
161 break;
162 case 3801 ... 7500:
163 regval = 0x02;
164 break;
165 case 7501 ... 15000:
166 regval = 0x01;
167 break;
168 case 15001 ... 30000:
169 regval = 0x00;
170 break;
171 default:
172 dev_err(&rdev->dev,
173 "Not supported ramp value %d %s\n", ramp, __func__);
174 return -EINVAL;
175 }
176
177 ret = regmap_update_bits(rdev->regmap, 0x07 + id, 0x07, regval);
178 if (ret < 0)
179 goto err_i2c;
180 return ret;
181 err_i2c:
182 dev_err(&rdev->dev, "i2c access error %s\n", __func__);
183 return ret;
184 }
185
186 static const struct regulator_ops lp8755_buck_ops = {
187 .map_voltage = regulator_map_voltage_linear,
188 .list_voltage = regulator_list_voltage_linear,
189 .set_voltage_sel = regulator_set_voltage_sel_regmap,
190 .get_voltage_sel = regulator_get_voltage_sel_regmap,
191 .enable = regulator_enable_regmap,
192 .disable = regulator_disable_regmap,
193 .is_enabled = regulator_is_enabled_regmap,
194 .enable_time = lp8755_buck_enable_time,
195 .set_mode = lp8755_buck_set_mode,
196 .get_mode = lp8755_buck_get_mode,
197 .set_ramp_delay = lp8755_buck_set_ramp,
198 };
199
200 #define lp8755_rail(_id) "lp8755_buck"#_id
201 #define lp8755_buck_init(_id)\
202 {\
203 .constraints = {\
204 .name = lp8755_rail(_id),\
205 .valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
206 .min_uV = 500000,\
207 .max_uV = 1675000,\
208 },\
209 }
210
211 static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
212 [LP8755_BUCK0] = lp8755_buck_init(0),
213 [LP8755_BUCK1] = lp8755_buck_init(1),
214 [LP8755_BUCK2] = lp8755_buck_init(2),
215 [LP8755_BUCK3] = lp8755_buck_init(3),
216 [LP8755_BUCK4] = lp8755_buck_init(4),
217 [LP8755_BUCK5] = lp8755_buck_init(5),
218 };
219
220 static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
221 { 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
222 { 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
223 LP8755_BUCK4, LP8755_BUCK5 } },
224 { 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
225 LP8755_BUCK5} },
226 { 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
227 { 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
228 { 2, { LP8755_BUCK0, LP8755_BUCK5} },
229 { 1, { LP8755_BUCK0} },
230 { 2, { LP8755_BUCK0, LP8755_BUCK3} },
231 { 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
232 };
233
lp8755_init_data(struct lp8755_chip * pchip)234 static int lp8755_init_data(struct lp8755_chip *pchip)
235 {
236 unsigned int regval;
237 int ret, icnt, buck_num;
238 struct lp8755_platform_data *pdata = pchip->pdata;
239
240 /* read back muti-phase configuration */
241 ret = regmap_read(pchip->regmap, 0x3D, ®val);
242 if (ret < 0)
243 goto out_i2c_error;
244 pchip->mphase = regval & 0x0F;
245
246 /* set default data based on multi-phase config */
247 for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
248 buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
249 pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
250 }
251 return ret;
252
253 out_i2c_error:
254 dev_err(pchip->dev, "i2c access error %s\n", __func__);
255 return ret;
256 }
257
258 #define lp8755_buck_desc(_id)\
259 {\
260 .name = lp8755_rail(_id),\
261 .id = LP8755_BUCK##_id,\
262 .ops = &lp8755_buck_ops,\
263 .n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
264 .uV_step = 10000,\
265 .min_uV = 500000,\
266 .type = REGULATOR_VOLTAGE,\
267 .owner = THIS_MODULE,\
268 .enable_reg = LP8755_REG_BUCK##_id,\
269 .enable_mask = LP8755_BUCK_EN_M,\
270 .vsel_reg = LP8755_REG_BUCK##_id,\
271 .vsel_mask = LP8755_BUCK_VOUT_M,\
272 }
273
274 static const struct regulator_desc lp8755_regulators[] = {
275 lp8755_buck_desc(0),
276 lp8755_buck_desc(1),
277 lp8755_buck_desc(2),
278 lp8755_buck_desc(3),
279 lp8755_buck_desc(4),
280 lp8755_buck_desc(5),
281 };
282
lp8755_regulator_init(struct lp8755_chip * pchip)283 static int lp8755_regulator_init(struct lp8755_chip *pchip)
284 {
285 int ret, icnt, buck_num;
286 struct lp8755_platform_data *pdata = pchip->pdata;
287 struct regulator_config rconfig = { };
288
289 rconfig.regmap = pchip->regmap;
290 rconfig.dev = pchip->dev;
291 rconfig.driver_data = pchip;
292
293 for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
294 buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
295 rconfig.init_data = pdata->buck_data[buck_num];
296 rconfig.of_node = pchip->dev->of_node;
297 pchip->rdev[buck_num] =
298 devm_regulator_register(pchip->dev,
299 &lp8755_regulators[buck_num], &rconfig);
300 if (IS_ERR(pchip->rdev[buck_num])) {
301 ret = PTR_ERR(pchip->rdev[buck_num]);
302 pchip->rdev[buck_num] = NULL;
303 dev_err(pchip->dev, "regulator init failed: buck %d\n",
304 buck_num);
305 return ret;
306 }
307 }
308
309 return 0;
310 }
311
lp8755_irq_handler(int irq,void * data)312 static irqreturn_t lp8755_irq_handler(int irq, void *data)
313 {
314 int ret, icnt;
315 unsigned int flag0, flag1;
316 struct lp8755_chip *pchip = data;
317
318 /* read flag0 register */
319 ret = regmap_read(pchip->regmap, 0x0D, &flag0);
320 if (ret < 0)
321 goto err_i2c;
322 /* clear flag register to pull up int. pin */
323 ret = regmap_write(pchip->regmap, 0x0D, 0x00);
324 if (ret < 0)
325 goto err_i2c;
326
327 /* sent power fault detection event to specific regulator */
328 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
329 if ((flag0 & (0x4 << icnt))
330 && (pchip->irqmask & (0x04 << icnt))
331 && (pchip->rdev[icnt] != NULL)) {
332 regulator_notifier_call_chain(pchip->rdev[icnt],
333 LP8755_EVENT_PWR_FAULT,
334 NULL);
335 }
336
337 /* read flag1 register */
338 ret = regmap_read(pchip->regmap, 0x0E, &flag1);
339 if (ret < 0)
340 goto err_i2c;
341 /* clear flag register to pull up int. pin */
342 ret = regmap_write(pchip->regmap, 0x0E, 0x00);
343 if (ret < 0)
344 goto err_i2c;
345
346 /* send OCP event to all regulator devices */
347 if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
348 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
349 if (pchip->rdev[icnt] != NULL) {
350 regulator_notifier_call_chain(pchip->rdev[icnt],
351 LP8755_EVENT_OCP,
352 NULL);
353 }
354
355 /* send OVP event to all regulator devices */
356 if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
357 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
358 if (pchip->rdev[icnt] != NULL) {
359 regulator_notifier_call_chain(pchip->rdev[icnt],
360 LP8755_EVENT_OVP,
361 NULL);
362 }
363 return IRQ_HANDLED;
364
365 err_i2c:
366 dev_err(pchip->dev, "i2c access error %s\n", __func__);
367 return IRQ_NONE;
368 }
369
lp8755_int_config(struct lp8755_chip * pchip)370 static int lp8755_int_config(struct lp8755_chip *pchip)
371 {
372 int ret;
373 unsigned int regval;
374
375 if (pchip->irq == 0) {
376 dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
377 return 0;
378 }
379
380 ret = regmap_read(pchip->regmap, 0x0F, ®val);
381 if (ret < 0) {
382 dev_err(pchip->dev, "i2c access error %s\n", __func__);
383 return ret;
384 }
385
386 pchip->irqmask = regval;
387 return devm_request_threaded_irq(pchip->dev, pchip->irq, NULL,
388 lp8755_irq_handler,
389 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
390 "lp8755-irq", pchip);
391 }
392
393 static const struct regmap_config lp8755_regmap = {
394 .reg_bits = 8,
395 .val_bits = 8,
396 .max_register = LP8755_REG_MAX,
397 };
398
lp8755_probe(struct i2c_client * client,const struct i2c_device_id * id)399 static int lp8755_probe(struct i2c_client *client,
400 const struct i2c_device_id *id)
401 {
402 int ret, icnt;
403 struct lp8755_chip *pchip;
404 struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev);
405
406 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
407 dev_err(&client->dev, "i2c functionality check fail.\n");
408 return -EOPNOTSUPP;
409 }
410
411 pchip = devm_kzalloc(&client->dev,
412 sizeof(struct lp8755_chip), GFP_KERNEL);
413 if (!pchip)
414 return -ENOMEM;
415
416 pchip->dev = &client->dev;
417 pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
418 if (IS_ERR(pchip->regmap)) {
419 ret = PTR_ERR(pchip->regmap);
420 dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
421 return ret;
422 }
423 i2c_set_clientdata(client, pchip);
424
425 if (pdata != NULL) {
426 pchip->pdata = pdata;
427 pchip->mphase = pdata->mphase;
428 } else {
429 pchip->pdata = devm_kzalloc(pchip->dev,
430 sizeof(struct lp8755_platform_data),
431 GFP_KERNEL);
432 if (!pchip->pdata)
433 return -ENOMEM;
434 ret = lp8755_init_data(pchip);
435 if (ret < 0) {
436 dev_err(&client->dev, "fail to initialize chip\n");
437 return ret;
438 }
439 }
440
441 ret = lp8755_regulator_init(pchip);
442 if (ret < 0) {
443 dev_err(&client->dev, "fail to initialize regulators\n");
444 goto err;
445 }
446
447 pchip->irq = client->irq;
448 ret = lp8755_int_config(pchip);
449 if (ret < 0) {
450 dev_err(&client->dev, "fail to irq config\n");
451 goto err;
452 }
453
454 return ret;
455
456 err:
457 /* output disable */
458 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
459 regmap_write(pchip->regmap, icnt, 0x00);
460
461 return ret;
462 }
463
lp8755_remove(struct i2c_client * client)464 static int lp8755_remove(struct i2c_client *client)
465 {
466 int icnt;
467 struct lp8755_chip *pchip = i2c_get_clientdata(client);
468
469 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
470 regmap_write(pchip->regmap, icnt, 0x00);
471
472 return 0;
473 }
474
475 static const struct i2c_device_id lp8755_id[] = {
476 {LP8755_NAME, 0},
477 {}
478 };
479
480 MODULE_DEVICE_TABLE(i2c, lp8755_id);
481
482 static struct i2c_driver lp8755_i2c_driver = {
483 .driver = {
484 .name = LP8755_NAME,
485 },
486 .probe = lp8755_probe,
487 .remove = lp8755_remove,
488 .id_table = lp8755_id,
489 };
490
lp8755_init(void)491 static int __init lp8755_init(void)
492 {
493 return i2c_add_driver(&lp8755_i2c_driver);
494 }
495
496 subsys_initcall(lp8755_init);
497
lp8755_exit(void)498 static void __exit lp8755_exit(void)
499 {
500 i2c_del_driver(&lp8755_i2c_driver);
501 }
502
503 module_exit(lp8755_exit);
504
505 MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
506 MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
507 MODULE_LICENSE("GPL v2");
508