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