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8766018b HC |
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 | ||
29 | static const struct regmap_config mt6311_regmap_config = { | |
30 | .reg_bits = 8, | |
31 | .val_bits = 8, | |
32 | .max_register = MT6311_FQMTR_CON4, | |
33 | }; | |
34 | ||
35 | /* Default limits measured in millivolts and milliamps */ | |
36 | #define MT6311_MIN_UV 600000 | |
53e38162 | 37 | #define MT6311_MAX_UV 1393750 |
8766018b HC |
38 | #define MT6311_STEP_UV 6250 |
39 | ||
40 | static const struct regulator_linear_range buck_volt_range[] = { | |
41 | REGULATOR_LINEAR_RANGE(MT6311_MIN_UV, 0, 0x7f, MT6311_STEP_UV), | |
42 | }; | |
43 | ||
44 | static struct regulator_ops mt6311_buck_ops = { | |
45 | .list_voltage = regulator_list_voltage_linear_range, | |
46 | .map_voltage = regulator_map_voltage_linear_range, | |
47 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
48 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
49 | .set_voltage_time_sel = regulator_set_voltage_time_sel, | |
50 | .enable = regulator_enable_regmap, | |
51 | .disable = regulator_disable_regmap, | |
52 | .is_enabled = regulator_is_enabled_regmap, | |
53 | }; | |
54 | ||
55 | static struct regulator_ops mt6311_ldo_ops = { | |
56 | .enable = regulator_enable_regmap, | |
57 | .disable = regulator_disable_regmap, | |
58 | .is_enabled = regulator_is_enabled_regmap, | |
59 | }; | |
60 | ||
61 | #define MT6311_BUCK(_id) \ | |
62 | {\ | |
63 | .name = #_id,\ | |
64 | .ops = &mt6311_buck_ops,\ | |
65 | .of_match = of_match_ptr(#_id),\ | |
66 | .regulators_node = of_match_ptr("regulators"),\ | |
67 | .type = REGULATOR_VOLTAGE,\ | |
68 | .id = MT6311_ID_##_id,\ | |
69 | .n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1,\ | |
70 | .min_uV = MT6311_MIN_UV,\ | |
71 | .uV_step = MT6311_STEP_UV,\ | |
72 | .owner = THIS_MODULE,\ | |
73 | .linear_ranges = buck_volt_range, \ | |
74 | .n_linear_ranges = ARRAY_SIZE(buck_volt_range), \ | |
75 | .enable_reg = MT6311_VDVFS11_CON9,\ | |
76 | .enable_mask = MT6311_PMIC_VDVFS11_EN_MASK,\ | |
77 | .vsel_reg = MT6311_VDVFS11_CON12,\ | |
78 | .vsel_mask = MT6311_PMIC_VDVFS11_VOSEL_MASK,\ | |
79 | } | |
80 | ||
81 | #define MT6311_LDO(_id) \ | |
82 | {\ | |
83 | .name = #_id,\ | |
84 | .ops = &mt6311_ldo_ops,\ | |
85 | .of_match = of_match_ptr(#_id),\ | |
86 | .regulators_node = of_match_ptr("regulators"),\ | |
87 | .type = REGULATOR_VOLTAGE,\ | |
88 | .id = MT6311_ID_##_id,\ | |
89 | .owner = THIS_MODULE,\ | |
90 | .enable_reg = MT6311_LDO_CON3,\ | |
91 | .enable_mask = MT6311_PMIC_RG_VBIASN_EN_MASK,\ | |
92 | } | |
93 | ||
94 | static struct regulator_desc mt6311_regulators[] = { | |
95 | MT6311_BUCK(VDVFS), | |
96 | MT6311_LDO(VBIASN), | |
97 | }; | |
98 | ||
99 | /* | |
100 | * I2C driver interface functions | |
101 | */ | |
102 | static int mt6311_i2c_probe(struct i2c_client *i2c, | |
103 | const struct i2c_device_id *id) | |
104 | { | |
105 | struct regulator_config config = { }; | |
106 | struct regulator_dev *rdev; | |
107 | struct regmap *regmap; | |
108 | int error, i, ret; | |
109 | unsigned int data; | |
110 | ||
111 | regmap = devm_regmap_init_i2c(i2c, &mt6311_regmap_config); | |
112 | if (IS_ERR(regmap)) { | |
113 | error = PTR_ERR(regmap); | |
114 | dev_err(&i2c->dev, "Failed to allocate register map: %d\n", | |
115 | error); | |
116 | return error; | |
117 | } | |
118 | ||
119 | ret = regmap_read(regmap, MT6311_SWCID, &data); | |
120 | if (ret < 0) { | |
121 | dev_err(&i2c->dev, "Failed to read DEVICE_ID reg: %d\n", ret); | |
122 | return ret; | |
123 | } | |
124 | ||
125 | switch (data) { | |
126 | case MT6311_E1_CID_CODE: | |
127 | case MT6311_E2_CID_CODE: | |
128 | case MT6311_E3_CID_CODE: | |
129 | break; | |
130 | default: | |
131 | dev_err(&i2c->dev, "Unsupported device id = 0x%x.\n", data); | |
132 | return -ENODEV; | |
133 | } | |
134 | ||
135 | for (i = 0; i < MT6311_MAX_REGULATORS; i++) { | |
136 | config.dev = &i2c->dev; | |
137 | config.regmap = regmap; | |
138 | ||
139 | rdev = devm_regulator_register(&i2c->dev, | |
140 | &mt6311_regulators[i], &config); | |
141 | if (IS_ERR(rdev)) { | |
142 | dev_err(&i2c->dev, | |
143 | "Failed to register MT6311 regulator\n"); | |
144 | return PTR_ERR(rdev); | |
145 | } | |
146 | } | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
151 | static const struct i2c_device_id mt6311_i2c_id[] = { | |
152 | {"mt6311", 0}, | |
153 | {}, | |
154 | }; | |
155 | MODULE_DEVICE_TABLE(i2c, mt6311_i2c_id); | |
156 | ||
157 | #ifdef CONFIG_OF | |
158 | static const struct of_device_id mt6311_dt_ids[] = { | |
159 | { .compatible = "mediatek,mt6311-regulator", | |
160 | .data = &mt6311_i2c_id[0] }, | |
161 | {}, | |
162 | }; | |
163 | MODULE_DEVICE_TABLE(of, mt6311_dt_ids); | |
164 | #endif | |
165 | ||
166 | static struct i2c_driver mt6311_regulator_driver = { | |
167 | .driver = { | |
168 | .name = "mt6311", | |
169 | .owner = THIS_MODULE, | |
170 | .of_match_table = of_match_ptr(mt6311_dt_ids), | |
171 | }, | |
172 | .probe = mt6311_i2c_probe, | |
173 | .id_table = mt6311_i2c_id, | |
174 | }; | |
175 | ||
176 | module_i2c_driver(mt6311_regulator_driver); | |
177 | ||
178 | MODULE_AUTHOR("Henry Chen <henryc.chen@mediatek.com>"); | |
179 | MODULE_DESCRIPTION("Regulator device driver for Mediatek MT6311"); | |
180 | MODULE_LICENSE("GPL v2"); |