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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");
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_linear_range buck_volt_range[] = {
42 REGULATOR_LINEAR_RANGE(MT6311_MIN_UV, 0, 0x7f, MT6311_STEP_UV),
43};
44
45static const struct regulator_ops mt6311_buck_ops = {
46 .list_voltage = regulator_list_voltage_linear_range,
47 .map_voltage = regulator_map_voltage_linear_range,
48 .set_voltage_sel = regulator_set_voltage_sel_regmap,
49 .get_voltage_sel = regulator_get_voltage_sel_regmap,
50 .set_voltage_time_sel = regulator_set_voltage_time_sel,
51 .enable = regulator_enable_regmap,
52 .disable = regulator_disable_regmap,
53 .is_enabled = regulator_is_enabled_regmap,
54};
55
56static const struct regulator_ops mt6311_ldo_ops = {
57 .enable = regulator_enable_regmap,
58 .disable = regulator_disable_regmap,
59 .is_enabled = regulator_is_enabled_regmap,
60};
61
62#define MT6311_BUCK(_id) \
63{\
64 .name = #_id,\
65 .ops = &mt6311_buck_ops,\
66 .of_match = of_match_ptr(#_id),\
67 .regulators_node = of_match_ptr("regulators"),\
68 .type = REGULATOR_VOLTAGE,\
69 .id = MT6311_ID_##_id,\
70 .n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1,\
71 .min_uV = MT6311_MIN_UV,\
72 .uV_step = MT6311_STEP_UV,\
73 .owner = THIS_MODULE,\
74 .linear_ranges = buck_volt_range, \
75 .n_linear_ranges = ARRAY_SIZE(buck_volt_range), \
76 .enable_reg = MT6311_VDVFS11_CON9,\
77 .enable_mask = MT6311_PMIC_VDVFS11_EN_MASK,\
78 .vsel_reg = MT6311_VDVFS11_CON12,\
79 .vsel_mask = MT6311_PMIC_VDVFS11_VOSEL_MASK,\
80}
81
82#define MT6311_LDO(_id) \
83{\
84 .name = #_id,\
85 .ops = &mt6311_ldo_ops,\
86 .of_match = of_match_ptr(#_id),\
87 .regulators_node = of_match_ptr("regulators"),\
88 .type = REGULATOR_VOLTAGE,\
89 .id = MT6311_ID_##_id,\
90 .owner = THIS_MODULE,\
91 .enable_reg = MT6311_LDO_CON3,\
92 .enable_mask = MT6311_PMIC_RG_VBIASN_EN_MASK,\
93}
94
95static const struct regulator_desc mt6311_regulators[] = {
96 MT6311_BUCK(VDVFS),
97 MT6311_LDO(VBIASN),
98};
99
100/*
101 * I2C driver interface functions
102 */
103static int mt6311_i2c_probe(struct i2c_client *i2c,
104 const struct i2c_device_id *id)
105{
106 struct regulator_config config = { };
107 struct regulator_dev *rdev;
108 struct regmap *regmap;
109 int i, ret;
110 unsigned int data;
111
112 regmap = devm_regmap_init_i2c(i2c, &mt6311_regmap_config);
113 if (IS_ERR(regmap)) {
114 ret = PTR_ERR(regmap);
115 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
116 ret);
117 return ret;
118 }
119
120 ret = regmap_read(regmap, MT6311_SWCID, &data);
121 if (ret < 0) {
122 dev_err(&i2c->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
123 return ret;
124 }
125
126 switch (data) {
127 case MT6311_E1_CID_CODE:
128 case MT6311_E2_CID_CODE:
129 case MT6311_E3_CID_CODE:
130 break;
131 default:
132 dev_err(&i2c->dev, "Unsupported device id = 0x%x.\n", data);
133 return -ENODEV;
134 }
135
136 for (i = 0; i < MT6311_MAX_REGULATORS; i++) {
137 config.dev = &i2c->dev;
138 config.regmap = regmap;
139
140 rdev = devm_regulator_register(&i2c->dev,
141 &mt6311_regulators[i], &config);
142 if (IS_ERR(rdev)) {
143 dev_err(&i2c->dev,
144 "Failed to register MT6311 regulator\n");
145 return PTR_ERR(rdev);
146 }
147 }
148
149 return 0;
150}
151
152static const struct i2c_device_id mt6311_i2c_id[] = {
153 {"mt6311", 0},
154 {},
155};
156MODULE_DEVICE_TABLE(i2c, mt6311_i2c_id);
157
158#ifdef CONFIG_OF
159static const struct of_device_id mt6311_dt_ids[] = {
160 { .compatible = "mediatek,mt6311-regulator",
161 .data = &mt6311_i2c_id[0] },
162 {},
163};
164MODULE_DEVICE_TABLE(of, mt6311_dt_ids);
165#endif
166
167static struct i2c_driver mt6311_regulator_driver = {
168 .driver = {
169 .name = "mt6311",
170 .of_match_table = of_match_ptr(mt6311_dt_ids),
171 },
172 .probe = mt6311_i2c_probe,
173 .id_table = mt6311_i2c_id,
174};
175
176module_i2c_driver(mt6311_regulator_driver);
177
178MODULE_AUTHOR("Henry Chen <henryc.chen@mediatek.com>");
179MODULE_DESCRIPTION("Regulator device driver for Mediatek MT6311");
180MODULE_LICENSE("GPL v2");