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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> | |
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 | ||
20 | static const struct regmap_config mt6311_regmap_config = { | |
21 | .reg_bits = 8, | |
22 | .val_bits = 8, | |
23 | .max_register = MT6311_FQMTR_CON4, | |
47769cbc | 24 | .cache_type = REGCACHE_RBTREE, |
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25 | }; |
26 | ||
27 | /* Default limits measured in millivolts and milliamps */ | |
28 | #define MT6311_MIN_UV 600000 | |
53e38162 | 29 | #define MT6311_MAX_UV 1393750 |
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30 | #define MT6311_STEP_UV 6250 |
31 | ||
08b472f7 | 32 | static const struct regulator_ops mt6311_buck_ops = { |
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33 | .list_voltage = regulator_list_voltage_linear, |
34 | .map_voltage = regulator_map_voltage_linear, | |
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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 | ||
08b472f7 | 43 | static const struct regulator_ops mt6311_ldo_ops = { |
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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,\ | |
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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 | ||
08b472f7 | 80 | static const struct regulator_desc mt6311_regulators[] = { |
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81 | MT6311_BUCK(VDVFS), |
82 | MT6311_LDO(VBIASN), | |
83 | }; | |
84 | ||
85 | /* | |
86 | * I2C driver interface functions | |
87 | */ | |
77e29598 | 88 | static int mt6311_i2c_probe(struct i2c_client *i2c) |
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89 | { |
90 | struct regulator_config config = { }; | |
91 | struct regulator_dev *rdev; | |
92 | struct regmap *regmap; | |
08b472f7 | 93 | int i, ret; |
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94 | unsigned int data; |
95 | ||
96 | regmap = devm_regmap_init_i2c(i2c, &mt6311_regmap_config); | |
97 | if (IS_ERR(regmap)) { | |
08b472f7 | 98 | ret = PTR_ERR(regmap); |
8766018b | 99 | dev_err(&i2c->dev, "Failed to allocate register map: %d\n", |
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100 | ret); |
101 | return ret; | |
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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 | ||
136 | static const struct i2c_device_id mt6311_i2c_id[] = { | |
137 | {"mt6311", 0}, | |
138 | {}, | |
139 | }; | |
140 | MODULE_DEVICE_TABLE(i2c, mt6311_i2c_id); | |
141 | ||
142 | #ifdef CONFIG_OF | |
143 | static const struct of_device_id mt6311_dt_ids[] = { | |
144 | { .compatible = "mediatek,mt6311-regulator", | |
145 | .data = &mt6311_i2c_id[0] }, | |
146 | {}, | |
147 | }; | |
148 | MODULE_DEVICE_TABLE(of, mt6311_dt_ids); | |
149 | #endif | |
150 | ||
151 | static struct i2c_driver mt6311_regulator_driver = { | |
152 | .driver = { | |
153 | .name = "mt6311", | |
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154 | .of_match_table = of_match_ptr(mt6311_dt_ids), |
155 | }, | |
77e29598 | 156 | .probe_new = 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"); |