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.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 | const struct regmap_config *config; |
29 | }; |
30 | |
31 | struct 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 | |
38 | static 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(map: rdev->regmap, reg: cfg->mode_reg, |
46 | SY8824C_MODE, SY8824C_MODE); |
47 | break; |
48 | case REGULATOR_MODE_NORMAL: |
49 | regmap_update_bits(map: rdev->regmap, reg: cfg->mode_reg, |
50 | SY8824C_MODE, val: 0); |
51 | break; |
52 | default: |
53 | return -EINVAL; |
54 | } |
55 | return 0; |
56 | } |
57 | |
58 | static 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(map: rdev->regmap, reg: cfg->mode_reg, val: &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 | |
74 | static 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 | |
87 | static 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(dev: di->dev, regulator_desc: &di->desc, config); |
108 | return PTR_ERR_OR_ZERO(ptr: rdev); |
109 | } |
110 | |
111 | static 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 | |
118 | static 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 | |
125 | static 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, size: sizeof(struct sy8824_device_info), GFP_KERNEL); |
135 | if (!di) |
136 | return -ENOMEM; |
137 | |
138 | di->regulator = of_get_regulator_init_data(dev, node: np, desc: &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 = i2c_get_match_data(client); |
146 | |
147 | regmap = devm_regmap_init_i2c(client, di->cfg->config); |
148 | if (IS_ERR(ptr: regmap)) { |
149 | dev_err(dev, "Failed to allocate regmap!\n" ); |
150 | return PTR_ERR(ptr: regmap); |
151 | } |
152 | i2c_set_clientdata(client, data: 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: &config); |
161 | if (ret < 0) |
162 | dev_err(dev, "Failed to register regulator!\n" ); |
163 | return ret; |
164 | } |
165 | |
166 | static 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 | |
176 | static 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 | |
186 | static 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 | |
196 | static 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 | |
206 | static const struct of_device_id sy8824_dt_ids[] = { |
207 | { .compatible = "silergy,sy8824c" , .data = &sy8824c_cfg }, |
208 | { .compatible = "silergy,sy8824e" , .data = &sy8824e_cfg }, |
209 | { .compatible = "silergy,sy20276" , .data = &sy20276_cfg }, |
210 | { .compatible = "silergy,sy20278" , .data = &sy20278_cfg }, |
211 | { } |
212 | }; |
213 | MODULE_DEVICE_TABLE(of, sy8824_dt_ids); |
214 | |
215 | static const struct i2c_device_id sy8824_id[] = { |
216 | { "sy8824" , (kernel_ulong_t)&sy8824c_cfg }, |
217 | { } |
218 | }; |
219 | MODULE_DEVICE_TABLE(i2c, sy8824_id); |
220 | |
221 | static struct i2c_driver sy8824_regulator_driver = { |
222 | .driver = { |
223 | .name = "sy8824-regulator" , |
224 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
225 | .of_match_table = sy8824_dt_ids, |
226 | }, |
227 | .probe = sy8824_i2c_probe, |
228 | .id_table = sy8824_id, |
229 | }; |
230 | module_i2c_driver(sy8824_regulator_driver); |
231 | |
232 | MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>" ); |
233 | MODULE_DESCRIPTION("SY8824C/SY8824E regulator driver" ); |
234 | MODULE_LICENSE("GPL v2" ); |
235 | |