1// SPDX-License-Identifier: GPL-2.0+
2//
3// pv88060-regulator.c - Regulator device driver for PV88060
4// Copyright (C) 2015  Powerventure Semiconductor Ltd.
5
6#include <linux/err.h>
7#include <linux/i2c.h>
8#include <linux/module.h>
9#include <linux/init.h>
10#include <linux/slab.h>
11#include <linux/regulator/driver.h>
12#include <linux/regulator/machine.h>
13#include <linux/regmap.h>
14#include <linux/irq.h>
15#include <linux/interrupt.h>
16#include <linux/regulator/of_regulator.h>
17#include "pv88060-regulator.h"
18
19#define PV88060_MAX_REGULATORS	14
20
21/* PV88060 REGULATOR IDs */
22enum {
23	/* BUCKs */
24	PV88060_ID_BUCK1,
25
26	/* LDOs */
27	PV88060_ID_LDO1,
28	PV88060_ID_LDO2,
29	PV88060_ID_LDO3,
30	PV88060_ID_LDO4,
31	PV88060_ID_LDO5,
32	PV88060_ID_LDO6,
33	PV88060_ID_LDO7,
34
35	/* SWTs */
36	PV88060_ID_SW1,
37	PV88060_ID_SW2,
38	PV88060_ID_SW3,
39	PV88060_ID_SW4,
40	PV88060_ID_SW5,
41	PV88060_ID_SW6,
42};
43
44struct pv88060_regulator {
45	struct regulator_desc desc;
46	unsigned int conf;		/* buck configuration register */
47};
48
49struct pv88060 {
50	struct device *dev;
51	struct regmap *regmap;
52	struct regulator_dev *rdev[PV88060_MAX_REGULATORS];
53};
54
55static const struct regmap_config pv88060_regmap_config = {
56	.reg_bits = 8,
57	.val_bits = 8,
58};
59
60/* Current limits array (in uA) for BUCK1
61 * Entry indexes corresponds to register values.
62 */
63
64static const unsigned int pv88060_buck1_limits[] = {
65	1496000, 2393000, 3291000, 4189000
66};
67
68static unsigned int pv88060_buck_get_mode(struct regulator_dev *rdev)
69{
70	struct pv88060_regulator *info = rdev_get_drvdata(rdev);
71	unsigned int data;
72	int ret, mode = 0;
73
74	ret = regmap_read(rdev->regmap, info->conf, &data);
75	if (ret < 0)
76		return ret;
77
78	switch (data & PV88060_BUCK_MODE_MASK) {
79	case PV88060_BUCK_MODE_SYNC:
80		mode = REGULATOR_MODE_FAST;
81		break;
82	case PV88060_BUCK_MODE_AUTO:
83		mode = REGULATOR_MODE_NORMAL;
84		break;
85	case PV88060_BUCK_MODE_SLEEP:
86		mode = REGULATOR_MODE_STANDBY;
87		break;
88	}
89
90	return mode;
91}
92
93static int pv88060_buck_set_mode(struct regulator_dev *rdev,
94					unsigned int mode)
95{
96	struct pv88060_regulator *info = rdev_get_drvdata(rdev);
97	int val = 0;
98
99	switch (mode) {
100	case REGULATOR_MODE_FAST:
101		val = PV88060_BUCK_MODE_SYNC;
102		break;
103	case REGULATOR_MODE_NORMAL:
104		val = PV88060_BUCK_MODE_AUTO;
105		break;
106	case REGULATOR_MODE_STANDBY:
107		val = PV88060_BUCK_MODE_SLEEP;
108		break;
109	default:
110		return -EINVAL;
111	}
112
113	return regmap_update_bits(rdev->regmap, info->conf,
114					PV88060_BUCK_MODE_MASK, val);
115}
116
117static const struct regulator_ops pv88060_buck_ops = {
118	.get_mode = pv88060_buck_get_mode,
119	.set_mode = pv88060_buck_set_mode,
120	.enable = regulator_enable_regmap,
121	.disable = regulator_disable_regmap,
122	.is_enabled = regulator_is_enabled_regmap,
123	.set_voltage_sel = regulator_set_voltage_sel_regmap,
124	.get_voltage_sel = regulator_get_voltage_sel_regmap,
125	.list_voltage = regulator_list_voltage_linear,
126	.set_current_limit = regulator_set_current_limit_regmap,
127	.get_current_limit = regulator_get_current_limit_regmap,
128};
129
130static const struct regulator_ops pv88060_ldo_ops = {
131	.enable = regulator_enable_regmap,
132	.disable = regulator_disable_regmap,
133	.is_enabled = regulator_is_enabled_regmap,
134	.set_voltage_sel = regulator_set_voltage_sel_regmap,
135	.get_voltage_sel = regulator_get_voltage_sel_regmap,
136	.list_voltage = regulator_list_voltage_linear,
137};
138
139static const struct regulator_ops pv88060_sw_ops = {
140	.enable = regulator_enable_regmap,
141	.disable = regulator_disable_regmap,
142	.is_enabled = regulator_is_enabled_regmap,
143};
144
145#define PV88060_BUCK(chip, regl_name, min, step, max, limits_array) \
146{\
147	.desc	=	{\
148		.id = chip##_ID_##regl_name,\
149		.name = __stringify(chip##_##regl_name),\
150		.of_match = of_match_ptr(#regl_name),\
151		.regulators_node = of_match_ptr("regulators"),\
152		.type = REGULATOR_VOLTAGE,\
153		.owner = THIS_MODULE,\
154		.ops = &pv88060_buck_ops,\
155		.min_uV = min,\
156		.uV_step = step,\
157		.n_voltages = ((max) - (min))/(step) + 1,\
158		.enable_reg = PV88060_REG_##regl_name##_CONF0,\
159		.enable_mask = PV88060_BUCK_EN, \
160		.vsel_reg = PV88060_REG_##regl_name##_CONF0,\
161		.vsel_mask = PV88060_VBUCK_MASK,\
162		.curr_table = limits_array,\
163		.n_current_limits = ARRAY_SIZE(limits_array),\
164		.csel_reg = PV88060_REG_##regl_name##_CONF1,\
165		.csel_mask = PV88060_BUCK_ILIM_MASK,\
166	},\
167	.conf = PV88060_REG_##regl_name##_CONF1,\
168}
169
170#define PV88060_LDO(chip, regl_name, min, step, max) \
171{\
172	.desc	=	{\
173		.id = chip##_ID_##regl_name,\
174		.name = __stringify(chip##_##regl_name),\
175		.of_match = of_match_ptr(#regl_name),\
176		.regulators_node = of_match_ptr("regulators"),\
177		.type = REGULATOR_VOLTAGE,\
178		.owner = THIS_MODULE,\
179		.ops = &pv88060_ldo_ops,\
180		.min_uV = min, \
181		.uV_step = step, \
182		.n_voltages = (step) ? ((max - min) / step + 1) : 1, \
183		.enable_reg = PV88060_REG_##regl_name##_CONF, \
184		.enable_mask = PV88060_LDO_EN, \
185		.vsel_reg = PV88060_REG_##regl_name##_CONF, \
186		.vsel_mask = PV88060_VLDO_MASK, \
187	},\
188}
189
190#define PV88060_SW(chip, regl_name, max) \
191{\
192	.desc	=	{\
193		.id = chip##_ID_##regl_name,\
194		.name = __stringify(chip##_##regl_name),\
195		.of_match = of_match_ptr(#regl_name),\
196		.regulators_node = of_match_ptr("regulators"),\
197		.type = REGULATOR_VOLTAGE,\
198		.owner = THIS_MODULE,\
199		.ops = &pv88060_sw_ops,\
200		.fixed_uV = max,\
201		.n_voltages = 1,\
202		.enable_reg = PV88060_REG_##regl_name##_CONF,\
203		.enable_mask = PV88060_SW_EN,\
204	},\
205}
206
207static const struct pv88060_regulator pv88060_regulator_info[] = {
208	PV88060_BUCK(PV88060, BUCK1, 2800000, 12500, 4387500,
209		pv88060_buck1_limits),
210	PV88060_LDO(PV88060, LDO1, 1200000, 50000, 3350000),
211	PV88060_LDO(PV88060, LDO2, 1200000, 50000, 3350000),
212	PV88060_LDO(PV88060, LDO3, 1200000, 50000, 3350000),
213	PV88060_LDO(PV88060, LDO4, 1200000, 50000, 3350000),
214	PV88060_LDO(PV88060, LDO5, 1200000, 50000, 3350000),
215	PV88060_LDO(PV88060, LDO6, 1200000, 50000, 3350000),
216	PV88060_LDO(PV88060, LDO7, 1200000, 50000, 3350000),
217	PV88060_SW(PV88060, SW1, 5000000),
218	PV88060_SW(PV88060, SW2, 5000000),
219	PV88060_SW(PV88060, SW3, 5000000),
220	PV88060_SW(PV88060, SW4, 5000000),
221	PV88060_SW(PV88060, SW5, 5000000),
222	PV88060_SW(PV88060, SW6, 5000000),
223};
224
225static irqreturn_t pv88060_irq_handler(int irq, void *data)
226{
227	struct pv88060 *chip = data;
228	int i, reg_val, err, ret = IRQ_NONE;
229
230	err = regmap_read(chip->regmap, PV88060_REG_EVENT_A, &reg_val);
231	if (err < 0)
232		goto error_i2c;
233
234	if (reg_val & PV88060_E_VDD_FLT) {
235		for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
236			if (chip->rdev[i] != NULL)
237				regulator_notifier_call_chain(chip->rdev[i],
238					REGULATOR_EVENT_UNDER_VOLTAGE,
239					NULL);
240		}
241
242		err = regmap_write(chip->regmap, PV88060_REG_EVENT_A,
243			PV88060_E_VDD_FLT);
244		if (err < 0)
245			goto error_i2c;
246
247		ret = IRQ_HANDLED;
248	}
249
250	if (reg_val & PV88060_E_OVER_TEMP) {
251		for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
252			if (chip->rdev[i] != NULL)
253				regulator_notifier_call_chain(chip->rdev[i],
254					REGULATOR_EVENT_OVER_TEMP,
255					NULL);
256		}
257
258		err = regmap_write(chip->regmap, PV88060_REG_EVENT_A,
259			PV88060_E_OVER_TEMP);
260		if (err < 0)
261			goto error_i2c;
262
263		ret = IRQ_HANDLED;
264	}
265
266	return ret;
267
268error_i2c:
269	dev_err(chip->dev, "I2C error : %d\n", err);
270	return IRQ_NONE;
271}
272
273/*
274 * I2C driver interface functions
275 */
276static int pv88060_i2c_probe(struct i2c_client *i2c)
277{
278	struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
279	struct pv88060 *chip;
280	struct regulator_config config = { };
281	int error, i, ret = 0;
282
283	chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88060), GFP_KERNEL);
284	if (!chip)
285		return -ENOMEM;
286
287	chip->dev = &i2c->dev;
288	chip->regmap = devm_regmap_init_i2c(i2c, &pv88060_regmap_config);
289	if (IS_ERR(chip->regmap)) {
290		error = PTR_ERR(chip->regmap);
291		dev_err(chip->dev, "Failed to allocate register map: %d\n",
292			error);
293		return error;
294	}
295
296	i2c_set_clientdata(i2c, chip);
297
298	if (i2c->irq != 0) {
299		ret = regmap_write(chip->regmap, PV88060_REG_MASK_A, 0xFF);
300		if (ret < 0) {
301			dev_err(chip->dev,
302				"Failed to mask A reg: %d\n", ret);
303			return ret;
304		}
305
306		ret = regmap_write(chip->regmap, PV88060_REG_MASK_B, 0xFF);
307		if (ret < 0) {
308			dev_err(chip->dev,
309				"Failed to mask B reg: %d\n", ret);
310			return ret;
311		}
312
313		ret = regmap_write(chip->regmap, PV88060_REG_MASK_C, 0xFF);
314		if (ret < 0) {
315			dev_err(chip->dev,
316				"Failed to mask C reg: %d\n", ret);
317			return ret;
318		}
319
320		ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
321					pv88060_irq_handler,
322					IRQF_TRIGGER_LOW|IRQF_ONESHOT,
323					"pv88060", chip);
324		if (ret != 0) {
325			dev_err(chip->dev, "Failed to request IRQ: %d\n",
326				i2c->irq);
327			return ret;
328		}
329
330		ret = regmap_update_bits(chip->regmap, PV88060_REG_MASK_A,
331			PV88060_M_VDD_FLT | PV88060_M_OVER_TEMP, 0);
332		if (ret < 0) {
333			dev_err(chip->dev,
334				"Failed to update mask reg: %d\n", ret);
335			return ret;
336		}
337
338	} else {
339		dev_warn(chip->dev, "No IRQ configured\n");
340	}
341
342	config.dev = chip->dev;
343	config.regmap = chip->regmap;
344
345	for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
346		if (init_data)
347			config.init_data = &init_data[i];
348
349		config.driver_data = (void *)&pv88060_regulator_info[i];
350		chip->rdev[i] = devm_regulator_register(chip->dev,
351			&pv88060_regulator_info[i].desc, &config);
352		if (IS_ERR(chip->rdev[i])) {
353			dev_err(chip->dev,
354				"Failed to register PV88060 regulator\n");
355			return PTR_ERR(chip->rdev[i]);
356		}
357	}
358
359	return 0;
360}
361
362static const struct i2c_device_id pv88060_i2c_id[] = {
363	{"pv88060", 0},
364	{},
365};
366MODULE_DEVICE_TABLE(i2c, pv88060_i2c_id);
367
368#ifdef CONFIG_OF
369static const struct of_device_id pv88060_dt_ids[] = {
370	{ .compatible = "pvs,pv88060", .data = &pv88060_i2c_id[0] },
371	{},
372};
373MODULE_DEVICE_TABLE(of, pv88060_dt_ids);
374#endif
375
376static struct i2c_driver pv88060_regulator_driver = {
377	.driver = {
378		.name = "pv88060",
379		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
380		.of_match_table = of_match_ptr(pv88060_dt_ids),
381	},
382	.probe = pv88060_i2c_probe,
383	.id_table = pv88060_i2c_id,
384};
385
386module_i2c_driver(pv88060_regulator_driver);
387
388MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
389MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88060");
390MODULE_LICENSE("GPL");
391