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
19 static 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_MAPLE,
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
31 static 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
42 static 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
79 static const struct regulator_desc mt6311_regulators[] = {
80 MT6311_BUCK(VDVFS),
81 MT6311_LDO(VBIASN),
82 };
83
84 /*
85 * I2C driver interface functions
86 */
mt6311_i2c_probe(struct i2c_client * i2c)87 static 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
135 static const struct i2c_device_id mt6311_i2c_id[] = {
136 { "mt6311" },
137 {}
138 };
139 MODULE_DEVICE_TABLE(i2c, mt6311_i2c_id);
140
141 #ifdef CONFIG_OF
142 static const struct of_device_id mt6311_dt_ids[] = {
143 { .compatible = "mediatek,mt6311-regulator",
144 .data = &mt6311_i2c_id[0] },
145 {},
146 };
147 MODULE_DEVICE_TABLE(of, mt6311_dt_ids);
148 #endif
149
150 static 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
160 module_i2c_driver(mt6311_regulator_driver);
161
162 MODULE_AUTHOR("Henry Chen <henryc.chen@mediatek.com>");
163 MODULE_DESCRIPTION("Regulator device driver for Mediatek MT6311");
164 MODULE_LICENSE("GPL v2");
165