1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // SY8824C/SY8824E regulator driver
4 //
5 // Copyright (C) 2019 Synaptics Incorporated
6 //
7 // Author: Jisheng Zhang <jszhang@kernel.org>
8
9 #include <linux/module.h>
10 #include <linux/i2c.h>
11 #include <linux/of_device.h>
12 #include <linux/regmap.h>
13 #include <linux/regulator/driver.h>
14 #include <linux/regulator/of_regulator.h>
15
16 #define SY8824C_BUCK_EN (1 << 7)
17 #define SY8824C_MODE (1 << 6)
18
19 struct sy8824_config {
20 /* registers */
21 unsigned int vol_reg;
22 unsigned int mode_reg;
23 unsigned int enable_reg;
24 /* Voltage range and step(linear) */
25 unsigned int vsel_min;
26 unsigned int vsel_step;
27 unsigned int vsel_count;
28 };
29
30 struct sy8824_device_info {
31 struct device *dev;
32 struct regulator_desc desc;
33 struct regulator_init_data *regulator;
34 const struct sy8824_config *cfg;
35 };
36
sy8824_set_mode(struct regulator_dev * rdev,unsigned int mode)37 static int sy8824_set_mode(struct regulator_dev *rdev, unsigned int mode)
38 {
39 struct sy8824_device_info *di = rdev_get_drvdata(rdev);
40 const struct sy8824_config *cfg = di->cfg;
41
42 switch (mode) {
43 case REGULATOR_MODE_FAST:
44 regmap_update_bits(rdev->regmap, cfg->mode_reg,
45 SY8824C_MODE, SY8824C_MODE);
46 break;
47 case REGULATOR_MODE_NORMAL:
48 regmap_update_bits(rdev->regmap, cfg->mode_reg,
49 SY8824C_MODE, 0);
50 break;
51 default:
52 return -EINVAL;
53 }
54 return 0;
55 }
56
sy8824_get_mode(struct regulator_dev * rdev)57 static unsigned int sy8824_get_mode(struct regulator_dev *rdev)
58 {
59 struct sy8824_device_info *di = rdev_get_drvdata(rdev);
60 const struct sy8824_config *cfg = di->cfg;
61 u32 val;
62 int ret = 0;
63
64 ret = regmap_read(rdev->regmap, cfg->mode_reg, &val);
65 if (ret < 0)
66 return ret;
67 if (val & SY8824C_MODE)
68 return REGULATOR_MODE_FAST;
69 else
70 return REGULATOR_MODE_NORMAL;
71 }
72
73 static const struct regulator_ops sy8824_regulator_ops = {
74 .set_voltage_sel = regulator_set_voltage_sel_regmap,
75 .get_voltage_sel = regulator_get_voltage_sel_regmap,
76 .set_voltage_time_sel = regulator_set_voltage_time_sel,
77 .map_voltage = regulator_map_voltage_linear,
78 .list_voltage = regulator_list_voltage_linear,
79 .enable = regulator_enable_regmap,
80 .disable = regulator_disable_regmap,
81 .is_enabled = regulator_is_enabled_regmap,
82 .set_mode = sy8824_set_mode,
83 .get_mode = sy8824_get_mode,
84 };
85
sy8824_regulator_register(struct sy8824_device_info * di,struct regulator_config * config)86 static int sy8824_regulator_register(struct sy8824_device_info *di,
87 struct regulator_config *config)
88 {
89 struct regulator_desc *rdesc = &di->desc;
90 const struct sy8824_config *cfg = di->cfg;
91 struct regulator_dev *rdev;
92
93 rdesc->name = "sy8824-reg";
94 rdesc->supply_name = "vin";
95 rdesc->ops = &sy8824_regulator_ops;
96 rdesc->type = REGULATOR_VOLTAGE;
97 rdesc->n_voltages = cfg->vsel_count;
98 rdesc->enable_reg = cfg->enable_reg;
99 rdesc->enable_mask = SY8824C_BUCK_EN;
100 rdesc->min_uV = cfg->vsel_min;
101 rdesc->uV_step = cfg->vsel_step;
102 rdesc->vsel_reg = cfg->vol_reg;
103 rdesc->vsel_mask = cfg->vsel_count - 1;
104 rdesc->owner = THIS_MODULE;
105
106 rdev = devm_regulator_register(di->dev, &di->desc, config);
107 return PTR_ERR_OR_ZERO(rdev);
108 }
109
110 static const struct regmap_config sy8824_regmap_config = {
111 .reg_bits = 8,
112 .val_bits = 8,
113 };
114
sy8824_i2c_probe(struct i2c_client * client)115 static int sy8824_i2c_probe(struct i2c_client *client)
116 {
117 struct device *dev = &client->dev;
118 struct device_node *np = dev->of_node;
119 struct sy8824_device_info *di;
120 struct regulator_config config = { };
121 struct regmap *regmap;
122 int ret;
123
124 di = devm_kzalloc(dev, sizeof(struct sy8824_device_info), GFP_KERNEL);
125 if (!di)
126 return -ENOMEM;
127
128 di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
129 if (!di->regulator) {
130 dev_err(dev, "Platform data not found!\n");
131 return -EINVAL;
132 }
133
134 di->dev = dev;
135 di->cfg = of_device_get_match_data(dev);
136
137 regmap = devm_regmap_init_i2c(client, &sy8824_regmap_config);
138 if (IS_ERR(regmap)) {
139 dev_err(dev, "Failed to allocate regmap!\n");
140 return PTR_ERR(regmap);
141 }
142 i2c_set_clientdata(client, di);
143
144 config.dev = di->dev;
145 config.init_data = di->regulator;
146 config.regmap = regmap;
147 config.driver_data = di;
148 config.of_node = np;
149
150 ret = sy8824_regulator_register(di, &config);
151 if (ret < 0)
152 dev_err(dev, "Failed to register regulator!\n");
153 return ret;
154 }
155
156 static const struct sy8824_config sy8824c_cfg = {
157 .vol_reg = 0x00,
158 .mode_reg = 0x00,
159 .enable_reg = 0x00,
160 .vsel_min = 762500,
161 .vsel_step = 12500,
162 .vsel_count = 64,
163 };
164
165 static const struct sy8824_config sy8824e_cfg = {
166 .vol_reg = 0x00,
167 .mode_reg = 0x00,
168 .enable_reg = 0x00,
169 .vsel_min = 700000,
170 .vsel_step = 12500,
171 .vsel_count = 64,
172 };
173
174 static const struct sy8824_config sy20276_cfg = {
175 .vol_reg = 0x00,
176 .mode_reg = 0x01,
177 .enable_reg = 0x01,
178 .vsel_min = 600000,
179 .vsel_step = 10000,
180 .vsel_count = 128,
181 };
182
183 static const struct sy8824_config sy20278_cfg = {
184 .vol_reg = 0x00,
185 .mode_reg = 0x01,
186 .enable_reg = 0x01,
187 .vsel_min = 762500,
188 .vsel_step = 12500,
189 .vsel_count = 64,
190 };
191
192 static const struct of_device_id sy8824_dt_ids[] = {
193 {
194 .compatible = "silergy,sy8824c",
195 .data = &sy8824c_cfg
196 },
197 {
198 .compatible = "silergy,sy8824e",
199 .data = &sy8824e_cfg
200 },
201 {
202 .compatible = "silergy,sy20276",
203 .data = &sy20276_cfg
204 },
205 {
206 .compatible = "silergy,sy20278",
207 .data = &sy20278_cfg
208 },
209 { }
210 };
211 MODULE_DEVICE_TABLE(of, sy8824_dt_ids);
212
213 static const struct i2c_device_id sy8824_id[] = {
214 { "sy8824", },
215 { },
216 };
217 MODULE_DEVICE_TABLE(i2c, sy8824_id);
218
219 static struct i2c_driver sy8824_regulator_driver = {
220 .driver = {
221 .name = "sy8824-regulator",
222 .of_match_table = of_match_ptr(sy8824_dt_ids),
223 },
224 .probe_new = sy8824_i2c_probe,
225 .id_table = sy8824_id,
226 };
227 module_i2c_driver(sy8824_regulator_driver);
228
229 MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
230 MODULE_DESCRIPTION("SY8824C/SY8824E regulator driver");
231 MODULE_LICENSE("GPL v2");
232