1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // AWINIC AW37503 Regulator Driver
4 //
5 // Copyright (C) 2023 awinic. All Rights Reserved
6 //
7 // Author: <like@awinic.com>
8
9 #include <linux/err.h>
10 #include <linux/gpio/consumer.h>
11 #include <linux/i2c.h>
12 #include <linux/module.h>
13 #include <linux/regmap.h>
14 #include <linux/regulator/driver.h>
15 #include <linux/regulator/machine.h>
16
17 #define AW37503_REG_VPOS 0x00
18 #define AW37503_REG_VNEG 0x01
19 #define AW37503_REG_APPS 0x03
20 #define AW37503_REG_CONTROL 0x04
21 #define AW37503_REG_WPRTEN 0x21
22
23 #define AW37503_VOUT_MASK 0x1F
24 #define AW37503_VOUT_N_VOLTAGE 0x15
25 #define AW37503_VOUT_VMIN 4000000
26 #define AW37503_VOUT_VMAX 6000000
27 #define AW37503_VOUT_STEP 100000
28
29 #define AW37503_REG_APPS_DIS_VPOS BIT(1)
30 #define AW37503_REG_APPS_DIS_VNEG BIT(0)
31
32 #define AW37503_REGULATOR_ID_VPOS 0
33 #define AW37503_REGULATOR_ID_VNEG 1
34 #define AW37503_MAX_REGULATORS 2
35
36 struct aw37503_reg_pdata {
37 struct gpio_desc *en_gpiod;
38 int ena_gpio_state;
39 };
40
41 struct aw37503_regulator {
42 struct device *dev;
43 struct aw37503_reg_pdata reg_pdata[AW37503_MAX_REGULATORS];
44 };
45
aw37503_regulator_enable(struct regulator_dev * rdev)46 static int aw37503_regulator_enable(struct regulator_dev *rdev)
47 {
48 struct aw37503_regulator *chip = rdev_get_drvdata(rdev);
49 int id = rdev_get_id(rdev);
50 struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id];
51 int ret;
52
53 if (!IS_ERR(rpdata->en_gpiod)) {
54 gpiod_set_value_cansleep(rpdata->en_gpiod, 1);
55 rpdata->ena_gpio_state = 1;
56 }
57
58 /* Hardware automatically enable discharge bit in enable */
59 if (rdev->constraints->active_discharge ==
60 REGULATOR_ACTIVE_DISCHARGE_DISABLE) {
61 ret = regulator_set_active_discharge_regmap(rdev, false);
62 if (ret < 0) {
63 dev_err(chip->dev, "Failed to disable active discharge: %d\n",
64 ret);
65 return ret;
66 }
67 }
68
69 return 0;
70 }
71
aw37503_regulator_disable(struct regulator_dev * rdev)72 static int aw37503_regulator_disable(struct regulator_dev *rdev)
73 {
74 struct aw37503_regulator *chip = rdev_get_drvdata(rdev);
75 int id = rdev_get_id(rdev);
76 struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id];
77
78 if (!IS_ERR(rpdata->en_gpiod)) {
79 gpiod_set_value_cansleep(rpdata->en_gpiod, 0);
80 rpdata->ena_gpio_state = 0;
81 }
82
83 return 0;
84 }
85
aw37503_regulator_is_enabled(struct regulator_dev * rdev)86 static int aw37503_regulator_is_enabled(struct regulator_dev *rdev)
87 {
88 struct aw37503_regulator *chip = rdev_get_drvdata(rdev);
89 int id = rdev_get_id(rdev);
90 struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id];
91
92 if (!IS_ERR(rpdata->en_gpiod))
93 return rpdata->ena_gpio_state;
94
95 return 1;
96 }
97
98 static const struct regulator_ops aw37503_regulator_ops = {
99 .enable = aw37503_regulator_enable,
100 .disable = aw37503_regulator_disable,
101 .is_enabled = aw37503_regulator_is_enabled,
102 .list_voltage = regulator_list_voltage_linear,
103 .map_voltage = regulator_map_voltage_linear,
104 .get_voltage_sel = regulator_get_voltage_sel_regmap,
105 .set_voltage_sel = regulator_set_voltage_sel_regmap,
106 .set_active_discharge = regulator_set_active_discharge_regmap,
107 };
108
aw37503_of_parse_cb(struct device_node * np,const struct regulator_desc * desc,struct regulator_config * config)109 static int aw37503_of_parse_cb(struct device_node *np,
110 const struct regulator_desc *desc,
111 struct regulator_config *config)
112 {
113 struct aw37503_regulator *chip = config->driver_data;
114 struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[desc->id];
115 int ret;
116
117 rpdata->en_gpiod = devm_fwnode_gpiod_get(chip->dev, of_fwnode_handle(np),
118 "enable", GPIOD_OUT_LOW,
119 "enable");
120
121 if (IS_ERR(rpdata->en_gpiod)) {
122 ret = PTR_ERR(rpdata->en_gpiod);
123
124 /* Ignore the error other than probe defer */
125 if (ret == -EPROBE_DEFER)
126 return ret;
127 return 0;
128 }
129
130 return 0;
131 }
132
133 #define AW37503_REGULATOR_DESC(_id, _name) \
134 [AW37503_REGULATOR_ID_##_id] = { \
135 .name = "aw37503-"#_name, \
136 .supply_name = "vin", \
137 .id = AW37503_REGULATOR_ID_##_id, \
138 .of_match = of_match_ptr(#_name), \
139 .of_parse_cb = aw37503_of_parse_cb, \
140 .ops = &aw37503_regulator_ops, \
141 .n_voltages = AW37503_VOUT_N_VOLTAGE, \
142 .min_uV = AW37503_VOUT_VMIN, \
143 .uV_step = AW37503_VOUT_STEP, \
144 .enable_time = 500, \
145 .vsel_mask = AW37503_VOUT_MASK, \
146 .vsel_reg = AW37503_REG_##_id, \
147 .active_discharge_off = 0, \
148 .active_discharge_on = AW37503_REG_APPS_DIS_##_id, \
149 .active_discharge_mask = AW37503_REG_APPS_DIS_##_id, \
150 .active_discharge_reg = AW37503_REG_APPS, \
151 .type = REGULATOR_VOLTAGE, \
152 .owner = THIS_MODULE, \
153 }
154
155 static const struct regulator_desc aw_regs_desc[AW37503_MAX_REGULATORS] = {
156 AW37503_REGULATOR_DESC(VPOS, outp),
157 AW37503_REGULATOR_DESC(VNEG, outn),
158 };
159
160 static const struct regmap_range aw37503_no_reg_ranges[] = {
161 regmap_reg_range(AW37503_REG_CONTROL + 1,
162 AW37503_REG_WPRTEN - 1),
163 };
164
165 static const struct regmap_access_table aw37503_no_reg_table = {
166 .no_ranges = aw37503_no_reg_ranges,
167 .n_no_ranges = ARRAY_SIZE(aw37503_no_reg_ranges),
168 };
169
170 static const struct regmap_config aw37503_regmap_config = {
171 .reg_bits = 8,
172 .val_bits = 8,
173 .max_register = AW37503_REG_WPRTEN,
174 .rd_table = &aw37503_no_reg_table,
175 .wr_table = &aw37503_no_reg_table,
176 };
177
aw37503_probe(struct i2c_client * client)178 static int aw37503_probe(struct i2c_client *client)
179 {
180 struct device *dev = &client->dev;
181 struct aw37503_regulator *chip;
182 struct regulator_dev *rdev;
183 struct regmap *regmap;
184 struct regulator_config config = { };
185 int id;
186
187 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
188 if (!chip)
189 return -ENOMEM;
190
191 regmap = devm_regmap_init_i2c(client, &aw37503_regmap_config);
192 if (IS_ERR(regmap))
193 return dev_err_probe(dev, PTR_ERR(regmap),
194 "Failed to init regmap\n");
195
196 i2c_set_clientdata(client, chip);
197 chip->dev = dev;
198
199 config.regmap = regmap;
200 config.dev = dev;
201 config.driver_data = chip;
202
203 for (id = 0; id < AW37503_MAX_REGULATORS; ++id) {
204 rdev = devm_regulator_register(dev, &aw_regs_desc[id],
205 &config);
206 if (IS_ERR(rdev))
207 return dev_err_probe(dev, PTR_ERR(rdev),
208 "Failed to register regulator %s\n",
209 aw_regs_desc[id].name);
210 }
211 return 0;
212 }
213
214 static const struct i2c_device_id aw37503_id[] = {
215 {.name = "aw37503",},
216 {},
217 };
218 MODULE_DEVICE_TABLE(i2c, aw37503_id);
219
220 static const struct of_device_id aw37503_of_match[] = {
221 {.compatible = "awinic,aw37503",},
222 { /* Sentinel */ },
223 };
224
225 MODULE_DEVICE_TABLE(of, aw37503_of_match);
226
227 static struct i2c_driver aw37503_i2c_driver = {
228 .driver = {
229 .name = "aw37503",
230 .of_match_table = aw37503_of_match,
231 },
232 .probe = aw37503_probe,
233 .id_table = aw37503_id,
234 };
235
236 module_i2c_driver(aw37503_i2c_driver);
237
238 MODULE_DESCRIPTION("aw37503 regulator driver");
239 MODULE_AUTHOR("Alec Li <like@awinic.com>");
240 MODULE_LICENSE("GPL");
241