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/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,
24 	.cache_type = REGCACHE_RBTREE,
25 };
26 
27 /* Default limits measured in millivolts and milliamps */
28 #define MT6311_MIN_UV		600000
29 #define MT6311_MAX_UV		1393750
30 #define MT6311_STEP_UV		6250
31 
32 static const struct regulator_ops mt6311_buck_ops = {
33 	.list_voltage = regulator_list_voltage_linear,
34 	.map_voltage = regulator_map_voltage_linear,
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 
43 static const struct regulator_ops mt6311_ldo_ops = {
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,\
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 
80 static const struct regulator_desc mt6311_regulators[] = {
81 	MT6311_BUCK(VDVFS),
82 	MT6311_LDO(VBIASN),
83 };
84 
85 /*
86  * I2C driver interface functions
87  */
88 static int mt6311_i2c_probe(struct i2c_client *i2c)
89 {
90 	struct regulator_config config = { };
91 	struct regulator_dev *rdev;
92 	struct regmap *regmap;
93 	int i, ret;
94 	unsigned int data;
95 
96 	regmap = devm_regmap_init_i2c(i2c, &mt6311_regmap_config);
97 	if (IS_ERR(regmap)) {
98 		ret = PTR_ERR(regmap);
99 		dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
100 			ret);
101 		return ret;
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",
154 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
155 		.of_match_table = of_match_ptr(mt6311_dt_ids),
156 	},
157 	.probe = mt6311_i2c_probe,
158 	.id_table = mt6311_i2c_id,
159 };
160 
161 module_i2c_driver(mt6311_regulator_driver);
162 
163 MODULE_AUTHOR("Henry Chen <henryc.chen@mediatek.com>");
164 MODULE_DESCRIPTION("Regulator device driver for Mediatek MT6311");
165 MODULE_LICENSE("GPL v2");
166