1// SPDX-License-Identifier: GPL-2.0
2//
3// Copyright (c) 2015 MediaTek Inc.
4// Author: Henry Chen <henryc.chen@mediatek.com>
5
6#include <linux/err.h>
7#include <linux/i2c.h>
8#include <linux/init.h>
9#include <linux/interrupt.h>
10#include <linux/module.h>
11#include <linux/regmap.h>
12#include <linux/regulator/driver.h>
13#include <linux/regulator/machine.h>
14#include <linux/regulator/of_regulator.h>
15#include <linux/regulator/mt6311.h>
16#include <linux/slab.h>
17#include "mt6311-regulator.h"
18
19static const struct regmap_config mt6311_regmap_config = {
20	.reg_bits = 8,
21	.val_bits = 8,
22	.max_register = MT6311_FQMTR_CON4,
23	.cache_type = REGCACHE_RBTREE,
24};
25
26/* Default limits measured in millivolts and milliamps */
27#define MT6311_MIN_UV		600000
28#define MT6311_MAX_UV		1393750
29#define MT6311_STEP_UV		6250
30
31static const struct regulator_ops mt6311_buck_ops = {
32	.list_voltage = regulator_list_voltage_linear,
33	.map_voltage = regulator_map_voltage_linear,
34	.set_voltage_sel = regulator_set_voltage_sel_regmap,
35	.get_voltage_sel = regulator_get_voltage_sel_regmap,
36	.set_voltage_time_sel = regulator_set_voltage_time_sel,
37	.enable = regulator_enable_regmap,
38	.disable = regulator_disable_regmap,
39	.is_enabled = regulator_is_enabled_regmap,
40};
41
42static const struct regulator_ops mt6311_ldo_ops = {
43	.enable = regulator_enable_regmap,
44	.disable = regulator_disable_regmap,
45	.is_enabled = regulator_is_enabled_regmap,
46};
47
48#define MT6311_BUCK(_id) \
49{\
50	.name = #_id,\
51	.ops = &mt6311_buck_ops,\
52	.of_match = of_match_ptr(#_id),\
53	.regulators_node = of_match_ptr("regulators"),\
54	.type = REGULATOR_VOLTAGE,\
55	.id = MT6311_ID_##_id,\
56	.n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1,\
57	.min_uV = MT6311_MIN_UV,\
58	.uV_step = MT6311_STEP_UV,\
59	.owner = THIS_MODULE,\
60	.enable_reg = MT6311_VDVFS11_CON9,\
61	.enable_mask = MT6311_PMIC_VDVFS11_EN_MASK,\
62	.vsel_reg = MT6311_VDVFS11_CON12,\
63	.vsel_mask = MT6311_PMIC_VDVFS11_VOSEL_MASK,\
64}
65
66#define MT6311_LDO(_id) \
67{\
68	.name = #_id,\
69	.ops = &mt6311_ldo_ops,\
70	.of_match = of_match_ptr(#_id),\
71	.regulators_node = of_match_ptr("regulators"),\
72	.type = REGULATOR_VOLTAGE,\
73	.id = MT6311_ID_##_id,\
74	.owner = THIS_MODULE,\
75	.enable_reg = MT6311_LDO_CON3,\
76	.enable_mask = MT6311_PMIC_RG_VBIASN_EN_MASK,\
77}
78
79static const struct regulator_desc mt6311_regulators[] = {
80	MT6311_BUCK(VDVFS),
81	MT6311_LDO(VBIASN),
82};
83
84/*
85 * I2C driver interface functions
86 */
87static int mt6311_i2c_probe(struct i2c_client *i2c)
88{
89	struct regulator_config config = { };
90	struct regulator_dev *rdev;
91	struct regmap *regmap;
92	int i, ret;
93	unsigned int data;
94
95	regmap = devm_regmap_init_i2c(i2c, &mt6311_regmap_config);
96	if (IS_ERR(regmap)) {
97		ret = PTR_ERR(regmap);
98		dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
99			ret);
100		return ret;
101	}
102
103	ret = regmap_read(regmap, MT6311_SWCID, &data);
104	if (ret < 0) {
105		dev_err(&i2c->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
106		return ret;
107	}
108
109	switch (data) {
110	case MT6311_E1_CID_CODE:
111	case MT6311_E2_CID_CODE:
112	case MT6311_E3_CID_CODE:
113		break;
114	default:
115		dev_err(&i2c->dev, "Unsupported device id = 0x%x.\n", data);
116		return -ENODEV;
117	}
118
119	for (i = 0; i < MT6311_MAX_REGULATORS; i++) {
120		config.dev = &i2c->dev;
121		config.regmap = regmap;
122
123		rdev = devm_regulator_register(&i2c->dev,
124			&mt6311_regulators[i], &config);
125		if (IS_ERR(rdev)) {
126			dev_err(&i2c->dev,
127				"Failed to register MT6311 regulator\n");
128			return PTR_ERR(rdev);
129		}
130	}
131
132	return 0;
133}
134
135static const struct i2c_device_id mt6311_i2c_id[] = {
136	{"mt6311", 0},
137	{},
138};
139MODULE_DEVICE_TABLE(i2c, mt6311_i2c_id);
140
141#ifdef CONFIG_OF
142static const struct of_device_id mt6311_dt_ids[] = {
143	{ .compatible = "mediatek,mt6311-regulator",
144	  .data = &mt6311_i2c_id[0] },
145	{},
146};
147MODULE_DEVICE_TABLE(of, mt6311_dt_ids);
148#endif
149
150static struct i2c_driver mt6311_regulator_driver = {
151	.driver = {
152		.name = "mt6311",
153		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
154		.of_match_table = of_match_ptr(mt6311_dt_ids),
155	},
156	.probe = mt6311_i2c_probe,
157	.id_table = mt6311_i2c_id,
158};
159
160module_i2c_driver(mt6311_regulator_driver);
161
162MODULE_AUTHOR("Henry Chen <henryc.chen@mediatek.com>");
163MODULE_DESCRIPTION("Regulator device driver for Mediatek MT6311");
164MODULE_LICENSE("GPL v2");
165