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 | |
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(ptr: rpdata->en_gpiod)) { |
54 | gpiod_set_value_cansleep(desc: rpdata->en_gpiod, value: 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, enable: 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 | |
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(ptr: rpdata->en_gpiod)) { |
79 | gpiod_set_value_cansleep(desc: rpdata->en_gpiod, value: 0); |
80 | rpdata->ena_gpio_state = 0; |
81 | } |
82 | |
83 | return 0; |
84 | } |
85 | |
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(ptr: 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 | |
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(dev: chip->dev, of_fwnode_handle(np), |
118 | con_id: "enable" , flags: GPIOD_OUT_LOW, |
119 | label: "enable" ); |
120 | |
121 | if (IS_ERR(ptr: rpdata->en_gpiod)) { |
122 | ret = PTR_ERR(ptr: 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 | |
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, size: 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(ptr: regmap)) |
193 | return dev_err_probe(dev, err: PTR_ERR(ptr: regmap), |
194 | fmt: "Failed to init regmap\n" ); |
195 | |
196 | i2c_set_clientdata(client, data: 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, regulator_desc: &aw_regs_desc[id], |
205 | config: &config); |
206 | if (IS_ERR(ptr: rdev)) |
207 | return dev_err_probe(dev, err: PTR_ERR(ptr: rdev), |
208 | fmt: "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 | |