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_RBTREE, |
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 | */ |
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(ptr: regmap)) { |
97 | ret = PTR_ERR(ptr: regmap); |
98 | dev_err(&i2c->dev, "Failed to allocate register map: %d\n" , |
99 | ret); |
100 | return ret; |
101 | } |
102 | |
103 | ret = regmap_read(map: regmap, MT6311_SWCID, val: &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(dev: &i2c->dev, |
124 | regulator_desc: &mt6311_regulators[i], config: &config); |
125 | if (IS_ERR(ptr: rdev)) { |
126 | dev_err(&i2c->dev, |
127 | "Failed to register MT6311 regulator\n" ); |
128 | return PTR_ERR(ptr: 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" , |
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 | |