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 .cache_type = REGCACHE_RBTREE,
34};
35
36/* Default limits measured in millivolts and milliamps */
37#define MT6311_MIN_UV 600000
38#define MT6311_MAX_UV 1393750
39#define MT6311_STEP_UV 6250
40
41static const struct regulator_ops mt6311_buck_ops = {
42 .list_voltage = regulator_list_voltage_linear,
43 .map_voltage = regulator_map_voltage_linear,
44 .set_voltage_sel = regulator_set_voltage_sel_regmap,
45 .get_voltage_sel = regulator_get_voltage_sel_regmap,
46 .set_voltage_time_sel = regulator_set_voltage_time_sel,
47 .enable = regulator_enable_regmap,
48 .disable = regulator_disable_regmap,
49 .is_enabled = regulator_is_enabled_regmap,
50};
51
52static const struct regulator_ops mt6311_ldo_ops = {
53 .enable = regulator_enable_regmap,
54 .disable = regulator_disable_regmap,
55 .is_enabled = regulator_is_enabled_regmap,
56};
57
58#define MT6311_BUCK(_id) \
59{\
60 .name = #_id,\
61 .ops = &mt6311_buck_ops,\
62 .of_match = of_match_ptr(#_id),\
63 .regulators_node = of_match_ptr("regulators"),\
64 .type = REGULATOR_VOLTAGE,\
65 .id = MT6311_ID_##_id,\
66 .n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1,\
67 .min_uV = MT6311_MIN_UV,\
68 .uV_step = MT6311_STEP_UV,\
69 .owner = THIS_MODULE,\
70 .enable_reg = MT6311_VDVFS11_CON9,\
71 .enable_mask = MT6311_PMIC_VDVFS11_EN_MASK,\
72 .vsel_reg = MT6311_VDVFS11_CON12,\
73 .vsel_mask = MT6311_PMIC_VDVFS11_VOSEL_MASK,\
74}
75
76#define MT6311_LDO(_id) \
77{\
78 .name = #_id,\
79 .ops = &mt6311_ldo_ops,\
80 .of_match = of_match_ptr(#_id),\
81 .regulators_node = of_match_ptr("regulators"),\
82 .type = REGULATOR_VOLTAGE,\
83 .id = MT6311_ID_##_id,\
84 .owner = THIS_MODULE,\
85 .enable_reg = MT6311_LDO_CON3,\
86 .enable_mask = MT6311_PMIC_RG_VBIASN_EN_MASK,\
87}
88
89static const struct regulator_desc mt6311_regulators[] = {
90 MT6311_BUCK(VDVFS),
91 MT6311_LDO(VBIASN),
92};
93
94/*
95 * I2C driver interface functions
96 */
97static int mt6311_i2c_probe(struct i2c_client *i2c,
98 const struct i2c_device_id *id)
99{
100 struct regulator_config config = { };
101 struct regulator_dev *rdev;
102 struct regmap *regmap;
103 int i, ret;
104 unsigned int data;
105
106 regmap = devm_regmap_init_i2c(i2c, &mt6311_regmap_config);
107 if (IS_ERR(regmap)) {
108 ret = PTR_ERR(regmap);
109 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
110 ret);
111 return ret;
112 }
113
114 ret = regmap_read(regmap, MT6311_SWCID, &data);
115 if (ret < 0) {
116 dev_err(&i2c->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
117 return ret;
118 }
119
120 switch (data) {
121 case MT6311_E1_CID_CODE:
122 case MT6311_E2_CID_CODE:
123 case MT6311_E3_CID_CODE:
124 break;
125 default:
126 dev_err(&i2c->dev, "Unsupported device id = 0x%x.\n", data);
127 return -ENODEV;
128 }
129
130 for (i = 0; i < MT6311_MAX_REGULATORS; i++) {
131 config.dev = &i2c->dev;
132 config.regmap = regmap;
133
134 rdev = devm_regulator_register(&i2c->dev,
135 &mt6311_regulators[i], &config);
136 if (IS_ERR(rdev)) {
137 dev_err(&i2c->dev,
138 "Failed to register MT6311 regulator\n");
139 return PTR_ERR(rdev);
140 }
141 }
142
143 return 0;
144}
145
146static const struct i2c_device_id mt6311_i2c_id[] = {
147 {"mt6311", 0},
148 {},
149};
150MODULE_DEVICE_TABLE(i2c, mt6311_i2c_id);
151
152#ifdef CONFIG_OF
153static const struct of_device_id mt6311_dt_ids[] = {
154 { .compatible = "mediatek,mt6311-regulator",
155 .data = &mt6311_i2c_id[0] },
156 {},
157};
158MODULE_DEVICE_TABLE(of, mt6311_dt_ids);
159#endif
160
161static struct i2c_driver mt6311_regulator_driver = {
162 .driver = {
163 .name = "mt6311",
164 .of_match_table = of_match_ptr(mt6311_dt_ids),
165 },
166 .probe = mt6311_i2c_probe,
167 .id_table = mt6311_i2c_id,
168};
169
170module_i2c_driver(mt6311_regulator_driver);
171
172MODULE_AUTHOR("Henry Chen <henryc.chen@mediatek.com>");
173MODULE_DESCRIPTION("Regulator device driver for Mediatek MT6311");
174MODULE_LICENSE("GPL v2");
175