1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // SY8827N regulator driver
4 //
5 // Copyright (C) 2020 Synaptics Incorporated
6 //
7 // Author: Jisheng Zhang <jszhang@kernel.org>
8
9 #include <linux/gpio/consumer.h>
10 #include <linux/module.h>
11 #include <linux/i2c.h>
12 #include <linux/of_device.h>
13 #include <linux/regmap.h>
14 #include <linux/regulator/driver.h>
15 #include <linux/regulator/of_regulator.h>
16
17 #define SY8827N_VSEL0 0
18 #define SY8827N_BUCK_EN (1 << 7)
19 #define SY8827N_MODE (1 << 6)
20 #define SY8827N_VSEL1 1
21 #define SY8827N_CTRL 2
22
23 #define SY8827N_NVOLTAGES 64
24 #define SY8827N_VSELMIN 600000
25 #define SY8827N_VSELSTEP 12500
26
27 struct sy8827n_device_info {
28 struct device *dev;
29 struct regulator_desc desc;
30 struct regulator_init_data *regulator;
31 struct gpio_desc *en_gpio;
32 unsigned int vsel_reg;
33 };
34
sy8827n_set_mode(struct regulator_dev * rdev,unsigned int mode)35 static int sy8827n_set_mode(struct regulator_dev *rdev, unsigned int mode)
36 {
37 struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
38
39 switch (mode) {
40 case REGULATOR_MODE_FAST:
41 regmap_update_bits(rdev->regmap, di->vsel_reg,
42 SY8827N_MODE, SY8827N_MODE);
43 break;
44 case REGULATOR_MODE_NORMAL:
45 regmap_update_bits(rdev->regmap, di->vsel_reg,
46 SY8827N_MODE, 0);
47 break;
48 default:
49 return -EINVAL;
50 }
51 return 0;
52 }
53
sy8827n_get_mode(struct regulator_dev * rdev)54 static unsigned int sy8827n_get_mode(struct regulator_dev *rdev)
55 {
56 struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
57 u32 val;
58 int ret = 0;
59
60 ret = regmap_read(rdev->regmap, di->vsel_reg, &val);
61 if (ret < 0)
62 return ret;
63 if (val & SY8827N_MODE)
64 return REGULATOR_MODE_FAST;
65 else
66 return REGULATOR_MODE_NORMAL;
67 }
68
69 static const struct regulator_ops sy8827n_regulator_ops = {
70 .set_voltage_sel = regulator_set_voltage_sel_regmap,
71 .get_voltage_sel = regulator_get_voltage_sel_regmap,
72 .set_voltage_time_sel = regulator_set_voltage_time_sel,
73 .map_voltage = regulator_map_voltage_linear,
74 .list_voltage = regulator_list_voltage_linear,
75 .enable = regulator_enable_regmap,
76 .disable = regulator_disable_regmap,
77 .is_enabled = regulator_is_enabled_regmap,
78 .set_mode = sy8827n_set_mode,
79 .get_mode = sy8827n_get_mode,
80 };
81
sy8827n_regulator_register(struct sy8827n_device_info * di,struct regulator_config * config)82 static int sy8827n_regulator_register(struct sy8827n_device_info *di,
83 struct regulator_config *config)
84 {
85 struct regulator_desc *rdesc = &di->desc;
86 struct regulator_dev *rdev;
87
88 rdesc->name = "sy8827n-reg";
89 rdesc->supply_name = "vin";
90 rdesc->ops = &sy8827n_regulator_ops;
91 rdesc->type = REGULATOR_VOLTAGE;
92 rdesc->n_voltages = SY8827N_NVOLTAGES;
93 rdesc->enable_reg = di->vsel_reg;
94 rdesc->enable_mask = SY8827N_BUCK_EN;
95 rdesc->min_uV = SY8827N_VSELMIN;
96 rdesc->uV_step = SY8827N_VSELSTEP;
97 rdesc->vsel_reg = di->vsel_reg;
98 rdesc->vsel_mask = rdesc->n_voltages - 1;
99 rdesc->owner = THIS_MODULE;
100
101 rdev = devm_regulator_register(di->dev, &di->desc, config);
102 return PTR_ERR_OR_ZERO(rdev);
103 }
104
105 static const struct regmap_config sy8827n_regmap_config = {
106 .reg_bits = 8,
107 .val_bits = 8,
108 };
109
sy8827n_i2c_probe(struct i2c_client * client)110 static int sy8827n_i2c_probe(struct i2c_client *client)
111 {
112 struct device *dev = &client->dev;
113 struct device_node *np = dev->of_node;
114 struct sy8827n_device_info *di;
115 struct regulator_config config = { };
116 struct regmap *regmap;
117 int ret;
118
119 di = devm_kzalloc(dev, sizeof(struct sy8827n_device_info), GFP_KERNEL);
120 if (!di)
121 return -ENOMEM;
122
123 di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
124 if (!di->regulator) {
125 dev_err(dev, "Platform data not found!\n");
126 return -EINVAL;
127 }
128
129 di->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
130 if (IS_ERR(di->en_gpio))
131 return PTR_ERR(di->en_gpio);
132
133 if (of_property_read_bool(np, "silergy,vsel-state-high"))
134 di->vsel_reg = SY8827N_VSEL1;
135 else
136 di->vsel_reg = SY8827N_VSEL0;
137
138 di->dev = dev;
139
140 regmap = devm_regmap_init_i2c(client, &sy8827n_regmap_config);
141 if (IS_ERR(regmap)) {
142 dev_err(dev, "Failed to allocate regmap!\n");
143 return PTR_ERR(regmap);
144 }
145 i2c_set_clientdata(client, di);
146
147 config.dev = di->dev;
148 config.init_data = di->regulator;
149 config.regmap = regmap;
150 config.driver_data = di;
151 config.of_node = np;
152
153 ret = sy8827n_regulator_register(di, &config);
154 if (ret < 0)
155 dev_err(dev, "Failed to register regulator!\n");
156 return ret;
157 }
158
159 #ifdef CONFIG_OF
160 static const struct of_device_id sy8827n_dt_ids[] = {
161 {
162 .compatible = "silergy,sy8827n",
163 },
164 { }
165 };
166 MODULE_DEVICE_TABLE(of, sy8827n_dt_ids);
167 #endif
168
169 static const struct i2c_device_id sy8827n_id[] = {
170 { "sy8827n", },
171 { },
172 };
173 MODULE_DEVICE_TABLE(i2c, sy8827n_id);
174
175 static struct i2c_driver sy8827n_regulator_driver = {
176 .driver = {
177 .name = "sy8827n-regulator",
178 .of_match_table = of_match_ptr(sy8827n_dt_ids),
179 },
180 .probe_new = sy8827n_i2c_probe,
181 .id_table = sy8827n_id,
182 };
183 module_i2c_driver(sy8827n_regulator_driver);
184
185 MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
186 MODULE_DESCRIPTION("SY8827N regulator driver");
187 MODULE_LICENSE("GPL v2");
188