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/regmap.h>
17#include <linux/uaccess.h>
18#include <linux/regulator/driver.h>
19#include <linux/regulator/machine.h>
20#include <linux/platform_data/lp8755.h>
21
22#define LP8755_REG_BUCK0	0x00
23#define LP8755_REG_BUCK1	0x03
24#define LP8755_REG_BUCK2	0x04
25#define LP8755_REG_BUCK3	0x01
26#define LP8755_REG_BUCK4	0x05
27#define LP8755_REG_BUCK5	0x02
28#define LP8755_REG_MAX		0xFF
29
30#define LP8755_BUCK_EN_M	BIT(7)
31#define LP8755_BUCK_LINEAR_OUT_MAX	0x76
32#define LP8755_BUCK_VOUT_M	0x7F
33
34struct lp8755_mphase {
35	int nreg;
36	int buck_num[LP8755_BUCK_MAX];
37};
38
39struct lp8755_chip {
40	struct device *dev;
41	struct regmap *regmap;
42	struct lp8755_platform_data *pdata;
43
44	int irq;
45	unsigned int irqmask;
46
47	int mphase;
48	struct regulator_dev *rdev[LP8755_BUCK_MAX];
49};
50
51static int lp8755_buck_enable_time(struct regulator_dev *rdev)
52{
53	int ret;
54	unsigned int regval;
55	enum lp8755_bucks id = rdev_get_id(rdev);
56
57	ret = regmap_read(rdev->regmap, 0x12 + id, &regval);
58	if (ret < 0) {
59		dev_err(&rdev->dev, "i2c access error %s\n", __func__);
60		return ret;
61	}
62	return (regval & 0xff) * 100;
63}
64
65static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
66{
67	int ret;
68	unsigned int regbval = 0x0;
69	enum lp8755_bucks id = rdev_get_id(rdev);
70	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
71
72	switch (mode) {
73	case REGULATOR_MODE_FAST:
74		/* forced pwm mode */
75		regbval = (0x01 << id);
76		break;
77	case REGULATOR_MODE_NORMAL:
78		/* enable automatic pwm/pfm mode */
79		ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x00);
80		if (ret < 0)
81			goto err_i2c;
82		break;
83	case REGULATOR_MODE_IDLE:
84		/* enable automatic pwm/pfm/lppfm mode */
85		ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x20);
86		if (ret < 0)
87			goto err_i2c;
88
89		ret = regmap_update_bits(rdev->regmap, 0x10, 0x01, 0x01);
90		if (ret < 0)
91			goto err_i2c;
92		break;
93	default:
94		dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
95		/* forced pwm mode */
96		regbval = (0x01 << id);
97	}
98
99	ret = regmap_update_bits(rdev->regmap, 0x06, 0x01 << id, regbval);
100	if (ret < 0)
101		goto err_i2c;
102	return ret;
103err_i2c:
104	dev_err(&rdev->dev, "i2c access error %s\n", __func__);
105	return ret;
106}
107
108static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
109{
110	int ret;
111	unsigned int regval;
112	enum lp8755_bucks id = rdev_get_id(rdev);
113
114	ret = regmap_read(rdev->regmap, 0x06, &regval);
115	if (ret < 0)
116		goto err_i2c;
117
118	/* mode fast means forced pwm mode */
119	if (regval & (0x01 << id))
120		return REGULATOR_MODE_FAST;
121
122	ret = regmap_read(rdev->regmap, 0x08 + id, &regval);
123	if (ret < 0)
124		goto err_i2c;
125
126	/* mode idle means automatic pwm/pfm/lppfm mode */
127	if (regval & 0x20)
128		return REGULATOR_MODE_IDLE;
129
130	/* mode normal means automatic pwm/pfm mode */
131	return REGULATOR_MODE_NORMAL;
132
133err_i2c:
134	dev_err(&rdev->dev, "i2c access error %s\n", __func__);
135	return 0;
136}
137
138static const unsigned int lp8755_buck_ramp_table[] = {
139	30000, 15000, 7500, 3800, 1900, 940, 470, 230
140};
141
142static const struct regulator_ops lp8755_buck_ops = {
143	.map_voltage = regulator_map_voltage_linear,
144	.list_voltage = regulator_list_voltage_linear,
145	.set_voltage_sel = regulator_set_voltage_sel_regmap,
146	.get_voltage_sel = regulator_get_voltage_sel_regmap,
147	.enable = regulator_enable_regmap,
148	.disable = regulator_disable_regmap,
149	.is_enabled = regulator_is_enabled_regmap,
150	.enable_time = lp8755_buck_enable_time,
151	.set_mode = lp8755_buck_set_mode,
152	.get_mode = lp8755_buck_get_mode,
153	.set_ramp_delay = regulator_set_ramp_delay_regmap,
154};
155
156#define lp8755_rail(_id) "lp8755_buck"#_id
157#define lp8755_buck_init(_id)\
158{\
159	.constraints = {\
160		.name = lp8755_rail(_id),\
161		.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
162		.min_uV = 500000,\
163		.max_uV = 1675000,\
164	},\
165}
166
167static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
168	[LP8755_BUCK0] = lp8755_buck_init(0),
169	[LP8755_BUCK1] = lp8755_buck_init(1),
170	[LP8755_BUCK2] = lp8755_buck_init(2),
171	[LP8755_BUCK3] = lp8755_buck_init(3),
172	[LP8755_BUCK4] = lp8755_buck_init(4),
173	[LP8755_BUCK5] = lp8755_buck_init(5),
174};
175
176static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
177	{ 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
178	{ 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
179	       LP8755_BUCK4, LP8755_BUCK5 } },
180	{ 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
181	       LP8755_BUCK5} },
182	{ 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
183	{ 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
184	{ 2, { LP8755_BUCK0, LP8755_BUCK5} },
185	{ 1, { LP8755_BUCK0} },
186	{ 2, { LP8755_BUCK0, LP8755_BUCK3} },
187	{ 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
188};
189
190static int lp8755_init_data(struct lp8755_chip *pchip)
191{
192	unsigned int regval;
193	int ret, icnt, buck_num;
194	struct lp8755_platform_data *pdata = pchip->pdata;
195
196	/* read back  muti-phase configuration */
197	ret = regmap_read(pchip->regmap, 0x3D, &regval);
198	if (ret < 0)
199		goto out_i2c_error;
200	pchip->mphase = regval & 0x0F;
201
202	/* set default data based on multi-phase config */
203	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
204		buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
205		pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
206	}
207	return ret;
208
209out_i2c_error:
210	dev_err(pchip->dev, "i2c access error %s\n", __func__);
211	return ret;
212}
213
214#define lp8755_buck_desc(_id)\
215{\
216	.name = lp8755_rail(_id),\
217	.id   = LP8755_BUCK##_id,\
218	.ops  = &lp8755_buck_ops,\
219	.n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
220	.uV_step = 10000,\
221	.min_uV = 500000,\
222	.type = REGULATOR_VOLTAGE,\
223	.owner = THIS_MODULE,\
224	.enable_reg = LP8755_REG_BUCK##_id,\
225	.enable_mask = LP8755_BUCK_EN_M,\
226	.vsel_reg = LP8755_REG_BUCK##_id,\
227	.vsel_mask = LP8755_BUCK_VOUT_M,\
228	.ramp_reg = (LP8755_BUCK##_id) + 0x7,\
229	.ramp_mask = 0x7,\
230	.ramp_delay_table = lp8755_buck_ramp_table,\
231	.n_ramp_values = ARRAY_SIZE(lp8755_buck_ramp_table),\
232}
233
234static const struct regulator_desc lp8755_regulators[] = {
235	lp8755_buck_desc(0),
236	lp8755_buck_desc(1),
237	lp8755_buck_desc(2),
238	lp8755_buck_desc(3),
239	lp8755_buck_desc(4),
240	lp8755_buck_desc(5),
241};
242
243static int lp8755_regulator_init(struct lp8755_chip *pchip)
244{
245	int ret, icnt, buck_num;
246	struct lp8755_platform_data *pdata = pchip->pdata;
247	struct regulator_config rconfig = { };
248
249	rconfig.regmap = pchip->regmap;
250	rconfig.dev = pchip->dev;
251	rconfig.driver_data = pchip;
252
253	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
254		buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
255		rconfig.init_data = pdata->buck_data[buck_num];
256		rconfig.of_node = pchip->dev->of_node;
257		pchip->rdev[buck_num] =
258		    devm_regulator_register(pchip->dev,
259				    &lp8755_regulators[buck_num], &rconfig);
260		if (IS_ERR(pchip->rdev[buck_num])) {
261			ret = PTR_ERR(pchip->rdev[buck_num]);
262			pchip->rdev[buck_num] = NULL;
263			dev_err(pchip->dev, "regulator init failed: buck %d\n",
264				buck_num);
265			return ret;
266		}
267	}
268
269	return 0;
270}
271
272static irqreturn_t lp8755_irq_handler(int irq, void *data)
273{
274	int ret, icnt;
275	unsigned int flag0, flag1;
276	struct lp8755_chip *pchip = data;
277
278	/* read flag0 register */
279	ret = regmap_read(pchip->regmap, 0x0D, &flag0);
280	if (ret < 0)
281		goto err_i2c;
282	/* clear flag register to pull up int. pin */
283	ret = regmap_write(pchip->regmap, 0x0D, 0x00);
284	if (ret < 0)
285		goto err_i2c;
286
287	/* sent power fault detection event to specific regulator */
288	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
289		if ((flag0 & (0x4 << icnt))
290		    && (pchip->irqmask & (0x04 << icnt))
291		    && (pchip->rdev[icnt] != NULL)) {
292			regulator_notifier_call_chain(pchip->rdev[icnt],
293						      LP8755_EVENT_PWR_FAULT,
294						      NULL);
295		}
296
297	/* read flag1 register */
298	ret = regmap_read(pchip->regmap, 0x0E, &flag1);
299	if (ret < 0)
300		goto err_i2c;
301	/* clear flag register to pull up int. pin */
302	ret = regmap_write(pchip->regmap, 0x0E, 0x00);
303	if (ret < 0)
304		goto err_i2c;
305
306	/* send OCP event to all regulator devices */
307	if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
308		for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
309			if (pchip->rdev[icnt] != NULL) {
310				regulator_notifier_call_chain(pchip->rdev[icnt],
311							      LP8755_EVENT_OCP,
312							      NULL);
313			}
314
315	/* send OVP event to all regulator devices */
316	if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
317		for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
318			if (pchip->rdev[icnt] != NULL) {
319				regulator_notifier_call_chain(pchip->rdev[icnt],
320							      LP8755_EVENT_OVP,
321							      NULL);
322			}
323	return IRQ_HANDLED;
324
325err_i2c:
326	dev_err(pchip->dev, "i2c access error %s\n", __func__);
327	return IRQ_NONE;
328}
329
330static int lp8755_int_config(struct lp8755_chip *pchip)
331{
332	int ret;
333	unsigned int regval;
334
335	if (pchip->irq == 0) {
336		dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
337		return 0;
338	}
339
340	ret = regmap_read(pchip->regmap, 0x0F, &regval);
341	if (ret < 0) {
342		dev_err(pchip->dev, "i2c access error %s\n", __func__);
343		return ret;
344	}
345
346	pchip->irqmask = regval;
347	return devm_request_threaded_irq(pchip->dev, pchip->irq, NULL,
348					 lp8755_irq_handler,
349					 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
350					 "lp8755-irq", pchip);
351}
352
353static const struct regmap_config lp8755_regmap = {
354	.reg_bits = 8,
355	.val_bits = 8,
356	.max_register = LP8755_REG_MAX,
357};
358
359static int lp8755_probe(struct i2c_client *client)
360{
361	int ret, icnt;
362	struct lp8755_chip *pchip;
363	struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev);
364
365	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
366		dev_err(&client->dev, "i2c functionality check fail.\n");
367		return -EOPNOTSUPP;
368	}
369
370	pchip = devm_kzalloc(&client->dev,
371			     sizeof(struct lp8755_chip), GFP_KERNEL);
372	if (!pchip)
373		return -ENOMEM;
374
375	pchip->dev = &client->dev;
376	pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
377	if (IS_ERR(pchip->regmap)) {
378		ret = PTR_ERR(pchip->regmap);
379		dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
380		return ret;
381	}
382	i2c_set_clientdata(client, pchip);
383
384	if (pdata != NULL) {
385		pchip->pdata = pdata;
386		pchip->mphase = pdata->mphase;
387	} else {
388		pchip->pdata = devm_kzalloc(pchip->dev,
389					    sizeof(struct lp8755_platform_data),
390					    GFP_KERNEL);
391		if (!pchip->pdata)
392			return -ENOMEM;
393		ret = lp8755_init_data(pchip);
394		if (ret < 0) {
395			dev_err(&client->dev, "fail to initialize chip\n");
396			return ret;
397		}
398	}
399
400	ret = lp8755_regulator_init(pchip);
401	if (ret < 0) {
402		dev_err(&client->dev, "fail to initialize regulators\n");
403		goto err;
404	}
405
406	pchip->irq = client->irq;
407	ret = lp8755_int_config(pchip);
408	if (ret < 0) {
409		dev_err(&client->dev, "fail to irq config\n");
410		goto err;
411	}
412
413	return ret;
414
415err:
416	/* output disable */
417	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
418		regmap_write(pchip->regmap, icnt, 0x00);
419
420	return ret;
421}
422
423static void lp8755_remove(struct i2c_client *client)
424{
425	int icnt;
426	struct lp8755_chip *pchip = i2c_get_clientdata(client);
427
428	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
429		regmap_write(pchip->regmap, icnt, 0x00);
430}
431
432static const struct i2c_device_id lp8755_id[] = {
433	{LP8755_NAME, 0},
434	{}
435};
436
437MODULE_DEVICE_TABLE(i2c, lp8755_id);
438
439static struct i2c_driver lp8755_i2c_driver = {
440	.driver = {
441		   .name = LP8755_NAME,
442		   .probe_type = PROBE_PREFER_ASYNCHRONOUS,
443		   },
444	.probe = lp8755_probe,
445	.remove = lp8755_remove,
446	.id_table = lp8755_id,
447};
448
449static int __init lp8755_init(void)
450{
451	return i2c_add_driver(&lp8755_i2c_driver);
452}
453
454subsys_initcall(lp8755_init);
455
456static void __exit lp8755_exit(void)
457{
458	i2c_del_driver(&lp8755_i2c_driver);
459}
460
461module_exit(lp8755_exit);
462
463MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
464MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
465MODULE_LICENSE("GPL v2");
466