1/*
2 * Copyright (c) 2015 MediaTek Inc.
3 * Author: Henry Chen <henryc.chen@mediatek.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 */
14
15#include <linux/err.h>
16#include <linux/gpio.h>
17#include <linux/i2c.h>
18#include <linux/init.h>
19#include <linux/interrupt.h>
20#include <linux/module.h>
21#include <linux/regmap.h>
22#include <linux/regulator/driver.h>
23#include <linux/regulator/machine.h>
24#include <linux/regulator/of_regulator.h>
25#include <linux/regulator/mt6311.h>
26#include <linux/slab.h>
27#include "mt6311-regulator.h"
28
29static const struct regmap_config mt6311_regmap_config = {
30	.reg_bits = 8,
31	.val_bits = 8,
32	.max_register = MT6311_FQMTR_CON4,
33};
34
35/* Default limits measured in millivolts and milliamps */
36#define MT6311_MIN_UV		600000
37#define MT6311_MAX_UV		1393750
38#define MT6311_STEP_UV		6250
39
40static const struct regulator_linear_range buck_volt_range[] = {
41	REGULATOR_LINEAR_RANGE(MT6311_MIN_UV, 0, 0x7f, MT6311_STEP_UV),
42};
43
44static const struct regulator_ops mt6311_buck_ops = {
45	.list_voltage = regulator_list_voltage_linear_range,
46	.map_voltage = regulator_map_voltage_linear_range,
47	.set_voltage_sel = regulator_set_voltage_sel_regmap,
48	.get_voltage_sel = regulator_get_voltage_sel_regmap,
49	.set_voltage_time_sel = regulator_set_voltage_time_sel,
50	.enable = regulator_enable_regmap,
51	.disable = regulator_disable_regmap,
52	.is_enabled = regulator_is_enabled_regmap,
53};
54
55static const struct regulator_ops mt6311_ldo_ops = {
56	.enable = regulator_enable_regmap,
57	.disable = regulator_disable_regmap,
58	.is_enabled = regulator_is_enabled_regmap,
59};
60
61#define MT6311_BUCK(_id) \
62{\
63	.name = #_id,\
64	.ops = &mt6311_buck_ops,\
65	.of_match = of_match_ptr(#_id),\
66	.regulators_node = of_match_ptr("regulators"),\
67	.type = REGULATOR_VOLTAGE,\
68	.id = MT6311_ID_##_id,\
69	.n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1,\
70	.min_uV = MT6311_MIN_UV,\
71	.uV_step = MT6311_STEP_UV,\
72	.owner = THIS_MODULE,\
73	.linear_ranges = buck_volt_range, \
74	.n_linear_ranges = ARRAY_SIZE(buck_volt_range), \
75	.enable_reg = MT6311_VDVFS11_CON9,\
76	.enable_mask = MT6311_PMIC_VDVFS11_EN_MASK,\
77	.vsel_reg = MT6311_VDVFS11_CON12,\
78	.vsel_mask = MT6311_PMIC_VDVFS11_VOSEL_MASK,\
79}
80
81#define MT6311_LDO(_id) \
82{\
83	.name = #_id,\
84	.ops = &mt6311_ldo_ops,\
85	.of_match = of_match_ptr(#_id),\
86	.regulators_node = of_match_ptr("regulators"),\
87	.type = REGULATOR_VOLTAGE,\
88	.id = MT6311_ID_##_id,\
89	.owner = THIS_MODULE,\
90	.enable_reg = MT6311_LDO_CON3,\
91	.enable_mask = MT6311_PMIC_RG_VBIASN_EN_MASK,\
92}
93
94static const struct regulator_desc mt6311_regulators[] = {
95	MT6311_BUCK(VDVFS),
96	MT6311_LDO(VBIASN),
97};
98
99/*
100 * I2C driver interface functions
101 */
102static int mt6311_i2c_probe(struct i2c_client *i2c,
103		const struct i2c_device_id *id)
104{
105	struct regulator_config config = { };
106	struct regulator_dev *rdev;
107	struct regmap *regmap;
108	int i, ret;
109	unsigned int data;
110
111	regmap = devm_regmap_init_i2c(i2c, &mt6311_regmap_config);
112	if (IS_ERR(regmap)) {
113		ret = PTR_ERR(regmap);
114		dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
115			ret);
116		return ret;
117	}
118
119	ret = regmap_read(regmap, MT6311_SWCID, &data);
120	if (ret < 0) {
121		dev_err(&i2c->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
122		return ret;
123	}
124
125	switch (data) {
126	case MT6311_E1_CID_CODE:
127	case MT6311_E2_CID_CODE:
128	case MT6311_E3_CID_CODE:
129		break;
130	default:
131		dev_err(&i2c->dev, "Unsupported device id = 0x%x.\n", data);
132		return -ENODEV;
133	}
134
135	for (i = 0; i < MT6311_MAX_REGULATORS; i++) {
136		config.dev = &i2c->dev;
137		config.regmap = regmap;
138
139		rdev = devm_regulator_register(&i2c->dev,
140			&mt6311_regulators[i], &config);
141		if (IS_ERR(rdev)) {
142			dev_err(&i2c->dev,
143				"Failed to register MT6311 regulator\n");
144			return PTR_ERR(rdev);
145		}
146	}
147
148	return 0;
149}
150
151static const struct i2c_device_id mt6311_i2c_id[] = {
152	{"mt6311", 0},
153	{},
154};
155MODULE_DEVICE_TABLE(i2c, mt6311_i2c_id);
156
157#ifdef CONFIG_OF
158static const struct of_device_id mt6311_dt_ids[] = {
159	{ .compatible = "mediatek,mt6311-regulator",
160	  .data = &mt6311_i2c_id[0] },
161	{},
162};
163MODULE_DEVICE_TABLE(of, mt6311_dt_ids);
164#endif
165
166static struct i2c_driver mt6311_regulator_driver = {
167	.driver = {
168		.name = "mt6311",
169		.of_match_table = of_match_ptr(mt6311_dt_ids),
170	},
171	.probe = mt6311_i2c_probe,
172	.id_table = mt6311_i2c_id,
173};
174
175module_i2c_driver(mt6311_regulator_driver);
176
177MODULE_AUTHOR("Henry Chen <henryc.chen@mediatek.com>");
178MODULE_DESCRIPTION("Regulator device driver for Mediatek MT6311");
179MODULE_LICENSE("GPL v2");
180