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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> | |
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5 | |
6 | #include <linux/err.h> | |
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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, | |
47769cbc | 23 | .cache_type = REGCACHE_RBTREE, |
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24 | }; |
25 | ||
26 | /* Default limits measured in millivolts and milliamps */ | |
27 | #define MT6311_MIN_UV 600000 | |
53e38162 | 28 | #define MT6311_MAX_UV 1393750 |
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29 | #define MT6311_STEP_UV 6250 |
30 | ||
08b472f7 | 31 | static const struct regulator_ops mt6311_buck_ops = { |
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32 | .list_voltage = regulator_list_voltage_linear, |
33 | .map_voltage = regulator_map_voltage_linear, | |
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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 | ||
08b472f7 | 42 | static const struct regulator_ops mt6311_ldo_ops = { |
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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,\ | |
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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 | ||
08b472f7 | 79 | static const struct regulator_desc mt6311_regulators[] = { |
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80 | MT6311_BUCK(VDVFS), |
81 | MT6311_LDO(VBIASN), | |
82 | }; | |
83 | ||
84 | /* | |
85 | * I2C driver interface functions | |
86 | */ | |
77e29598 | 87 | static int mt6311_i2c_probe(struct i2c_client *i2c) |
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88 | { |
89 | struct regulator_config config = { }; | |
90 | struct regulator_dev *rdev; | |
91 | struct regmap *regmap; | |
08b472f7 | 92 | int i, ret; |
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93 | unsigned int data; |
94 | ||
95 | regmap = devm_regmap_init_i2c(i2c, &mt6311_regmap_config); | |
96 | if (IS_ERR(regmap)) { | |
08b472f7 | 97 | ret = PTR_ERR(regmap); |
8766018b | 98 | dev_err(&i2c->dev, "Failed to allocate register map: %d\n", |
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99 | ret); |
100 | return ret; | |
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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", 0}, | |
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", | |
259b93b2 | 153 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
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154 | .of_match_table = of_match_ptr(mt6311_dt_ids), |
155 | }, | |
964e1865 | 156 | .probe = mt6311_i2c_probe, |
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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"); |