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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
19struct sy8824_config {
20
21 unsigned int vol_reg;
22 unsigned int mode_reg;
23 unsigned int enable_reg;
24
25 unsigned int vsel_min;
26 unsigned int vsel_step;
27 unsigned int vsel_count;
28 const struct regmap_config *config;
29};
30
31struct sy8824_device_info {
32 struct device *dev;
33 struct regulator_desc desc;
34 struct regulator_init_data *regulator;
35 const struct sy8824_config *cfg;
36};
37
38static int sy8824_set_mode(struct regulator_dev *rdev, unsigned int mode)
39{
40 struct sy8824_device_info *di = rdev_get_drvdata(rdev);
41 const struct sy8824_config *cfg = di->cfg;
42
43 switch (mode) {
44 case REGULATOR_MODE_FAST:
45 regmap_update_bits(rdev->regmap, cfg->mode_reg,
46 SY8824C_MODE, SY8824C_MODE);
47 break;
48 case REGULATOR_MODE_NORMAL:
49 regmap_update_bits(rdev->regmap, cfg->mode_reg,
50 SY8824C_MODE, 0);
51 break;
52 default:
53 return -EINVAL;
54 }
55 return 0;
56}
57
58static unsigned int sy8824_get_mode(struct regulator_dev *rdev)
59{
60 struct sy8824_device_info *di = rdev_get_drvdata(rdev);
61 const struct sy8824_config *cfg = di->cfg;
62 u32 val;
63 int ret = 0;
64
65 ret = regmap_read(rdev->regmap, cfg->mode_reg, &val);
66 if (ret < 0)
67 return ret;
68 if (val & SY8824C_MODE)
69 return REGULATOR_MODE_FAST;
70 else
71 return REGULATOR_MODE_NORMAL;
72}
73
74static const struct regulator_ops sy8824_regulator_ops = {
75 .set_voltage_sel = regulator_set_voltage_sel_regmap,
76 .get_voltage_sel = regulator_get_voltage_sel_regmap,
77 .set_voltage_time_sel = regulator_set_voltage_time_sel,
78 .map_voltage = regulator_map_voltage_linear,
79 .list_voltage = regulator_list_voltage_linear,
80 .enable = regulator_enable_regmap,
81 .disable = regulator_disable_regmap,
82 .is_enabled = regulator_is_enabled_regmap,
83 .set_mode = sy8824_set_mode,
84 .get_mode = sy8824_get_mode,
85};
86
87static int sy8824_regulator_register(struct sy8824_device_info *di,
88 struct regulator_config *config)
89{
90 struct regulator_desc *rdesc = &di->desc;
91 const struct sy8824_config *cfg = di->cfg;
92 struct regulator_dev *rdev;
93
94 rdesc->name = "sy8824-reg";
95 rdesc->supply_name = "vin";
96 rdesc->ops = &sy8824_regulator_ops;
97 rdesc->type = REGULATOR_VOLTAGE;
98 rdesc->n_voltages = cfg->vsel_count;
99 rdesc->enable_reg = cfg->enable_reg;
100 rdesc->enable_mask = SY8824C_BUCK_EN;
101 rdesc->min_uV = cfg->vsel_min;
102 rdesc->uV_step = cfg->vsel_step;
103 rdesc->vsel_reg = cfg->vol_reg;
104 rdesc->vsel_mask = cfg->vsel_count - 1;
105 rdesc->owner = THIS_MODULE;
106
107 rdev = devm_regulator_register(di->dev, &di->desc, config);
108 return PTR_ERR_OR_ZERO(rdev);
109}
110
111static const struct regmap_config sy8824_regmap_config = {
112 .reg_bits = 8,
113 .val_bits = 8,
114 .num_reg_defaults_raw = 1,
115 .cache_type = REGCACHE_FLAT,
116};
117
118static const struct regmap_config sy20276_regmap_config = {
119 .reg_bits = 8,
120 .val_bits = 8,
121 .num_reg_defaults_raw = 2,
122 .cache_type = REGCACHE_FLAT,
123};
124
125static int sy8824_i2c_probe(struct i2c_client *client)
126{
127 struct device *dev = &client->dev;
128 struct device_node *np = dev->of_node;
129 struct sy8824_device_info *di;
130 struct regulator_config config = { };
131 struct regmap *regmap;
132 int ret;
133
134 di = devm_kzalloc(dev, sizeof(struct sy8824_device_info), GFP_KERNEL);
135 if (!di)
136 return -ENOMEM;
137
138 di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
139 if (!di->regulator) {
140 dev_err(dev, "Platform data not found!\n");
141 return -EINVAL;
142 }
143
144 di->dev = dev;
145 di->cfg = of_device_get_match_data(dev);
146
147 regmap = devm_regmap_init_i2c(client, di->cfg->config);
148 if (IS_ERR(regmap)) {
149 dev_err(dev, "Failed to allocate regmap!\n");
150 return PTR_ERR(regmap);
151 }
152 i2c_set_clientdata(client, di);
153
154 config.dev = di->dev;
155 config.init_data = di->regulator;
156 config.regmap = regmap;
157 config.driver_data = di;
158 config.of_node = np;
159
160 ret = sy8824_regulator_register(di, &config);
161 if (ret < 0)
162 dev_err(dev, "Failed to register regulator!\n");
163 return ret;
164}
165
166static const struct sy8824_config sy8824c_cfg = {
167 .vol_reg = 0x00,
168 .mode_reg = 0x00,
169 .enable_reg = 0x00,
170 .vsel_min = 762500,
171 .vsel_step = 12500,
172 .vsel_count = 64,
173 .config = &sy8824_regmap_config,
174};
175
176static const struct sy8824_config sy8824e_cfg = {
177 .vol_reg = 0x00,
178 .mode_reg = 0x00,
179 .enable_reg = 0x00,
180 .vsel_min = 700000,
181 .vsel_step = 12500,
182 .vsel_count = 64,
183 .config = &sy8824_regmap_config,
184};
185
186static const struct sy8824_config sy20276_cfg = {
187 .vol_reg = 0x00,
188 .mode_reg = 0x01,
189 .enable_reg = 0x01,
190 .vsel_min = 600000,
191 .vsel_step = 10000,
192 .vsel_count = 128,
193 .config = &sy20276_regmap_config,
194};
195
196static const struct sy8824_config sy20278_cfg = {
197 .vol_reg = 0x00,
198 .mode_reg = 0x01,
199 .enable_reg = 0x01,
200 .vsel_min = 762500,
201 .vsel_step = 12500,
202 .vsel_count = 64,
203 .config = &sy20276_regmap_config,
204};
205
206static const struct of_device_id sy8824_dt_ids[] = {
207 {
208 .compatible = "silergy,sy8824c",
209 .data = &sy8824c_cfg
210 },
211 {
212 .compatible = "silergy,sy8824e",
213 .data = &sy8824e_cfg
214 },
215 {
216 .compatible = "silergy,sy20276",
217 .data = &sy20276_cfg
218 },
219 {
220 .compatible = "silergy,sy20278",
221 .data = &sy20278_cfg
222 },
223 { }
224};
225MODULE_DEVICE_TABLE(of, sy8824_dt_ids);
226
227static const struct i2c_device_id sy8824_id[] = {
228 { "sy8824", },
229 { },
230};
231MODULE_DEVICE_TABLE(i2c, sy8824_id);
232
233static struct i2c_driver sy8824_regulator_driver = {
234 .driver = {
235 .name = "sy8824-regulator",
236 .of_match_table = of_match_ptr(sy8824_dt_ids),
237 },
238 .probe_new = sy8824_i2c_probe,
239 .id_table = sy8824_id,
240};
241module_i2c_driver(sy8824_regulator_driver);
242
243MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
244MODULE_DESCRIPTION("SY8824C/SY8824E regulator driver");
245MODULE_LICENSE("GPL v2");
246
