1// SPDX-License-Identifier: GPL-2.0+
2//
3// pv88090-regulator.c - Regulator device driver for PV88090
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 "pv88090-regulator.h"
18
19#define PV88090_MAX_REGULATORS	5
20
21/* PV88090 REGULATOR IDs */
22enum {
23	/* BUCKs */
24	PV88090_ID_BUCK1,
25	PV88090_ID_BUCK2,
26	PV88090_ID_BUCK3,
27
28	/* LDOs */
29	PV88090_ID_LDO1,
30	PV88090_ID_LDO2,
31};
32
33struct pv88090_regulator {
34	struct regulator_desc desc;
35	unsigned int conf;
36	unsigned int conf2;
37};
38
39struct pv88090 {
40	struct device *dev;
41	struct regmap *regmap;
42	struct regulator_dev *rdev[PV88090_MAX_REGULATORS];
43};
44
45struct pv88090_buck_voltage {
46	int min_uV;
47	int max_uV;
48	int uV_step;
49};
50
51static const struct regmap_config pv88090_regmap_config = {
52	.reg_bits = 8,
53	.val_bits = 8,
54};
55
56/* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.
57 *  Entry indexes corresponds to register values.
58 */
59
60static const unsigned int pv88090_buck1_limits[] = {
61	 220000,  440000,  660000,  880000, 1100000, 1320000, 1540000, 1760000,
62	1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000,
63	3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000,
64	5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000
65};
66
67static const unsigned int pv88090_buck23_limits[] = {
68	1496000, 2393000, 3291000, 4189000
69};
70
71static const struct pv88090_buck_voltage pv88090_buck_vol[3] = {
72	{
73		.min_uV = 600000,
74		.max_uV = 1393750,
75		.uV_step = 6250,
76	},
77
78	{
79		.min_uV = 1400000,
80		.max_uV = 2193750,
81		.uV_step = 6250,
82	},
83	{
84		.min_uV = 1250000,
85		.max_uV = 2837500,
86		.uV_step = 12500,
87	},
88};
89
90static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev)
91{
92	struct pv88090_regulator *info = rdev_get_drvdata(rdev);
93	unsigned int data;
94	int ret, mode = 0;
95
96	ret = regmap_read(rdev->regmap, info->conf, &data);
97	if (ret < 0)
98		return ret;
99
100	switch (data & PV88090_BUCK1_MODE_MASK) {
101	case PV88090_BUCK_MODE_SYNC:
102		mode = REGULATOR_MODE_FAST;
103		break;
104	case PV88090_BUCK_MODE_AUTO:
105		mode = REGULATOR_MODE_NORMAL;
106		break;
107	case PV88090_BUCK_MODE_SLEEP:
108		mode = REGULATOR_MODE_STANDBY;
109		break;
110	}
111
112	return mode;
113}
114
115static int pv88090_buck_set_mode(struct regulator_dev *rdev,
116					unsigned int mode)
117{
118	struct pv88090_regulator *info = rdev_get_drvdata(rdev);
119	int val = 0;
120
121	switch (mode) {
122	case REGULATOR_MODE_FAST:
123		val = PV88090_BUCK_MODE_SYNC;
124		break;
125	case REGULATOR_MODE_NORMAL:
126		val = PV88090_BUCK_MODE_AUTO;
127		break;
128	case REGULATOR_MODE_STANDBY:
129		val = PV88090_BUCK_MODE_SLEEP;
130		break;
131	default:
132		return -EINVAL;
133	}
134
135	return regmap_update_bits(rdev->regmap, info->conf,
136					PV88090_BUCK1_MODE_MASK, val);
137}
138
139static const struct regulator_ops pv88090_buck_ops = {
140	.get_mode = pv88090_buck_get_mode,
141	.set_mode = pv88090_buck_set_mode,
142	.enable = regulator_enable_regmap,
143	.disable = regulator_disable_regmap,
144	.is_enabled = regulator_is_enabled_regmap,
145	.set_voltage_sel = regulator_set_voltage_sel_regmap,
146	.get_voltage_sel = regulator_get_voltage_sel_regmap,
147	.list_voltage = regulator_list_voltage_linear,
148	.set_current_limit = regulator_set_current_limit_regmap,
149	.get_current_limit = regulator_get_current_limit_regmap,
150};
151
152static const struct regulator_ops pv88090_ldo_ops = {
153	.enable = regulator_enable_regmap,
154	.disable = regulator_disable_regmap,
155	.is_enabled = regulator_is_enabled_regmap,
156	.set_voltage_sel = regulator_set_voltage_sel_regmap,
157	.get_voltage_sel = regulator_get_voltage_sel_regmap,
158	.list_voltage = regulator_list_voltage_linear,
159};
160
161#define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \
162{\
163	.desc	=	{\
164		.id = chip##_ID_##regl_name,\
165		.name = __stringify(chip##_##regl_name),\
166		.of_match = of_match_ptr(#regl_name),\
167		.regulators_node = of_match_ptr("regulators"),\
168		.type = REGULATOR_VOLTAGE,\
169		.owner = THIS_MODULE,\
170		.ops = &pv88090_buck_ops,\
171		.min_uV = min, \
172		.uV_step = step, \
173		.n_voltages = ((max) - (min))/(step) + 1, \
174		.enable_reg = PV88090_REG_##regl_name##_CONF0, \
175		.enable_mask = PV88090_##regl_name##_EN, \
176		.vsel_reg = PV88090_REG_##regl_name##_CONF0, \
177		.vsel_mask = PV88090_V##regl_name##_MASK, \
178		.curr_table = limits_array, \
179		.n_current_limits = ARRAY_SIZE(limits_array), \
180		.csel_reg = PV88090_REG_##regl_name##_CONF1, \
181		.csel_mask = PV88090_##regl_name##_ILIM_MASK, \
182	},\
183	.conf = PV88090_REG_##regl_name##_CONF1, \
184	.conf2 = PV88090_REG_##regl_name##_CONF2, \
185}
186
187#define PV88090_LDO(chip, regl_name, min, step, max) \
188{\
189	.desc	=	{\
190		.id = chip##_ID_##regl_name,\
191		.name = __stringify(chip##_##regl_name),\
192		.of_match = of_match_ptr(#regl_name),\
193		.regulators_node = of_match_ptr("regulators"),\
194		.type = REGULATOR_VOLTAGE,\
195		.owner = THIS_MODULE,\
196		.ops = &pv88090_ldo_ops,\
197		.min_uV = min, \
198		.uV_step = step, \
199		.n_voltages = ((max) - (min))/(step) + 1, \
200		.enable_reg = PV88090_REG_##regl_name##_CONT, \
201		.enable_mask = PV88090_##regl_name##_EN, \
202		.vsel_reg = PV88090_REG_##regl_name##_CONT, \
203		.vsel_mask = PV88090_V##regl_name##_MASK, \
204	},\
205}
206
207static struct pv88090_regulator pv88090_regulator_info[] = {
208	PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750,
209		pv88090_buck1_limits),
210	PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750,
211		pv88090_buck23_limits),
212	PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750,
213		pv88090_buck23_limits),
214	PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000),
215	PV88090_LDO(PV88090, LDO2,  650000, 25000, 2225000),
216};
217
218static irqreturn_t pv88090_irq_handler(int irq, void *data)
219{
220	struct pv88090 *chip = data;
221	int i, reg_val, err, ret = IRQ_NONE;
222
223	err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, &reg_val);
224	if (err < 0)
225		goto error_i2c;
226
227	if (reg_val & PV88090_E_VDD_FLT) {
228		for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
229			if (chip->rdev[i] != NULL)
230				regulator_notifier_call_chain(chip->rdev[i],
231					REGULATOR_EVENT_UNDER_VOLTAGE,
232					NULL);
233		}
234
235		err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
236			PV88090_E_VDD_FLT);
237		if (err < 0)
238			goto error_i2c;
239
240		ret = IRQ_HANDLED;
241	}
242
243	if (reg_val & PV88090_E_OVER_TEMP) {
244		for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
245			if (chip->rdev[i] != NULL)
246				regulator_notifier_call_chain(chip->rdev[i],
247					REGULATOR_EVENT_OVER_TEMP,
248					NULL);
249		}
250
251		err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
252			PV88090_E_OVER_TEMP);
253		if (err < 0)
254			goto error_i2c;
255
256		ret = IRQ_HANDLED;
257	}
258
259	return ret;
260
261error_i2c:
262	dev_err(chip->dev, "I2C error : %d\n", err);
263	return IRQ_NONE;
264}
265
266/*
267 * I2C driver interface functions
268 */
269static int pv88090_i2c_probe(struct i2c_client *i2c)
270{
271	struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
272	struct pv88090 *chip;
273	struct regulator_config config = { };
274	int error, i, ret = 0;
275	unsigned int conf2, range, index;
276
277	chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL);
278	if (!chip)
279		return -ENOMEM;
280
281	chip->dev = &i2c->dev;
282	chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config);
283	if (IS_ERR(chip->regmap)) {
284		error = PTR_ERR(chip->regmap);
285		dev_err(chip->dev, "Failed to allocate register map: %d\n",
286			error);
287		return error;
288	}
289
290	i2c_set_clientdata(i2c, chip);
291
292	if (i2c->irq != 0) {
293		ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF);
294		if (ret < 0) {
295			dev_err(chip->dev,
296				"Failed to mask A reg: %d\n", ret);
297			return ret;
298		}
299
300		ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF);
301		if (ret < 0) {
302			dev_err(chip->dev,
303				"Failed to mask B reg: %d\n", ret);
304			return ret;
305		}
306
307		ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
308					pv88090_irq_handler,
309					IRQF_TRIGGER_LOW|IRQF_ONESHOT,
310					"pv88090", chip);
311		if (ret != 0) {
312			dev_err(chip->dev, "Failed to request IRQ: %d\n",
313				i2c->irq);
314			return ret;
315		}
316
317		ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A,
318			PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0);
319		if (ret < 0) {
320			dev_err(chip->dev,
321				"Failed to update mask reg: %d\n", ret);
322			return ret;
323		}
324
325	} else {
326		dev_warn(chip->dev, "No IRQ configured\n");
327	}
328
329	config.dev = chip->dev;
330	config.regmap = chip->regmap;
331
332	for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
333		if (init_data)
334			config.init_data = &init_data[i];
335
336		if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) {
337			ret = regmap_read(chip->regmap,
338				pv88090_regulator_info[i].conf2, &conf2);
339			if (ret < 0)
340				return ret;
341
342			conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) &
343				PV88090_BUCK_VDAC_RANGE_MASK;
344
345			ret = regmap_read(chip->regmap,
346				PV88090_REG_BUCK_FOLD_RANGE, &range);
347			if (ret < 0)
348				return ret;
349
350			range = (range >>
351				 (PV88090_BUCK_VRANGE_GAIN_SHIFT + i - 1)) &
352				PV88090_BUCK_VRANGE_GAIN_MASK;
353			index = ((range << 1) | conf2);
354			if (index > PV88090_ID_BUCK3) {
355				dev_err(chip->dev,
356					"Invalid index(%d)\n", index);
357				return -EINVAL;
358			}
359
360			pv88090_regulator_info[i].desc.min_uV
361				= pv88090_buck_vol[index].min_uV;
362			pv88090_regulator_info[i].desc.uV_step
363				= pv88090_buck_vol[index].uV_step;
364			pv88090_regulator_info[i].desc.n_voltages
365				= ((pv88090_buck_vol[index].max_uV)
366				- (pv88090_buck_vol[index].min_uV))
367				/(pv88090_buck_vol[index].uV_step) + 1;
368		}
369
370		config.driver_data = (void *)&pv88090_regulator_info[i];
371		chip->rdev[i] = devm_regulator_register(chip->dev,
372			&pv88090_regulator_info[i].desc, &config);
373		if (IS_ERR(chip->rdev[i])) {
374			dev_err(chip->dev,
375				"Failed to register PV88090 regulator\n");
376			return PTR_ERR(chip->rdev[i]);
377		}
378	}
379
380	return 0;
381}
382
383static const struct i2c_device_id pv88090_i2c_id[] = {
384	{"pv88090", 0},
385	{},
386};
387MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id);
388
389#ifdef CONFIG_OF
390static const struct of_device_id pv88090_dt_ids[] = {
391	{ .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] },
392	{},
393};
394MODULE_DEVICE_TABLE(of, pv88090_dt_ids);
395#endif
396
397static struct i2c_driver pv88090_regulator_driver = {
398	.driver = {
399		.name = "pv88090",
400		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
401		.of_match_table = of_match_ptr(pv88090_dt_ids),
402	},
403	.probe = pv88090_i2c_probe,
404	.id_table = pv88090_i2c_id,
405};
406
407module_i2c_driver(pv88090_regulator_driver);
408
409MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
410MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090");
411MODULE_LICENSE("GPL");
412