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
35struct lp8755_mphase {
36	int nreg;
37	int buck_num[LP8755_BUCK_MAX];
38};
39
40struct 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
52static 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, &regval);
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
66static 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;
104err_i2c:
105	dev_err(&rdev->dev, "i2c access error %s\n", __func__);
106	return ret;
107}
108
109static 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, &regval);
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, &regval);
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
134err_i2c:
135	dev_err(&rdev->dev, "i2c access error %s\n", __func__);
136	return 0;
137}
138
139static 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;
181err_i2c:
182	dev_err(&rdev->dev, "i2c access error %s\n", __func__);
183	return ret;
184}
185
186static 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
211static 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
220static 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
234static 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, &regval);
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
253out_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
274static 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
283static 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
312static 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
365err_i2c:
366	dev_err(pchip->dev, "i2c access error %s\n", __func__);
367	return IRQ_NONE;
368}
369
370static 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, &regval);
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
393static const struct regmap_config lp8755_regmap = {
394	.reg_bits = 8,
395	.val_bits = 8,
396	.max_register = LP8755_REG_MAX,
397};
398
399static 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
456err:
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
464static 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
475static const struct i2c_device_id lp8755_id[] = {
476	{LP8755_NAME, 0},
477	{}
478};
479
480MODULE_DEVICE_TABLE(i2c, lp8755_id);
481
482static 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
491static int __init lp8755_init(void)
492{
493	return i2c_add_driver(&lp8755_i2c_driver);
494}
495
496subsys_initcall(lp8755_init);
497
498static void __exit lp8755_exit(void)
499{
500	i2c_del_driver(&lp8755_i2c_driver);
501}
502
503module_exit(lp8755_exit);
504
505MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
506MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
507MODULE_LICENSE("GPL v2");
508