1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // |
3 | // SY8827N regulator driver |
4 | // |
5 | // Copyright (C) 2020 Synaptics Incorporated |
6 | // |
7 | // Author: Jisheng Zhang <jszhang@kernel.org> |
8 | |
9 | #include <linux/gpio/consumer.h> |
10 | #include <linux/module.h> |
11 | #include <linux/i2c.h> |
12 | #include <linux/of.h> |
13 | #include <linux/regmap.h> |
14 | #include <linux/regulator/driver.h> |
15 | #include <linux/regulator/of_regulator.h> |
16 | |
17 | #define SY8827N_VSEL0 0 |
18 | #define SY8827N_BUCK_EN (1 << 7) |
19 | #define SY8827N_MODE (1 << 6) |
20 | #define SY8827N_VSEL1 1 |
21 | #define SY8827N_CTRL 2 |
22 | #define SY8827N_ID1 3 |
23 | #define SY8827N_ID2 4 |
24 | #define SY8827N_PGOOD 5 |
25 | #define SY8827N_MAX (SY8827N_PGOOD + 1) |
26 | |
27 | #define SY8827N_NVOLTAGES 64 |
28 | #define SY8827N_VSELMIN 600000 |
29 | #define SY8827N_VSELSTEP 12500 |
30 | |
31 | struct sy8827n_device_info { |
32 | struct device *dev; |
33 | struct regulator_desc desc; |
34 | struct regulator_init_data *regulator; |
35 | struct gpio_desc *en_gpio; |
36 | unsigned int vsel_reg; |
37 | }; |
38 | |
39 | static int sy8827n_set_mode(struct regulator_dev *rdev, unsigned int mode) |
40 | { |
41 | struct sy8827n_device_info *di = rdev_get_drvdata(rdev); |
42 | |
43 | switch (mode) { |
44 | case REGULATOR_MODE_FAST: |
45 | regmap_update_bits(map: rdev->regmap, reg: di->vsel_reg, |
46 | SY8827N_MODE, SY8827N_MODE); |
47 | break; |
48 | case REGULATOR_MODE_NORMAL: |
49 | regmap_update_bits(map: rdev->regmap, reg: di->vsel_reg, |
50 | SY8827N_MODE, val: 0); |
51 | break; |
52 | default: |
53 | return -EINVAL; |
54 | } |
55 | return 0; |
56 | } |
57 | |
58 | static unsigned int sy8827n_get_mode(struct regulator_dev *rdev) |
59 | { |
60 | struct sy8827n_device_info *di = rdev_get_drvdata(rdev); |
61 | u32 val; |
62 | int ret = 0; |
63 | |
64 | ret = regmap_read(map: rdev->regmap, reg: di->vsel_reg, val: &val); |
65 | if (ret < 0) |
66 | return ret; |
67 | if (val & SY8827N_MODE) |
68 | return REGULATOR_MODE_FAST; |
69 | else |
70 | return REGULATOR_MODE_NORMAL; |
71 | } |
72 | |
73 | static const struct regulator_ops sy8827n_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 = sy8827n_set_mode, |
83 | .get_mode = sy8827n_get_mode, |
84 | }; |
85 | |
86 | static int sy8827n_regulator_register(struct sy8827n_device_info *di, |
87 | struct regulator_config *config) |
88 | { |
89 | struct regulator_desc *rdesc = &di->desc; |
90 | struct regulator_dev *rdev; |
91 | |
92 | rdesc->name = "sy8827n-reg" ; |
93 | rdesc->supply_name = "vin" ; |
94 | rdesc->ops = &sy8827n_regulator_ops; |
95 | rdesc->type = REGULATOR_VOLTAGE; |
96 | rdesc->n_voltages = SY8827N_NVOLTAGES; |
97 | rdesc->enable_reg = di->vsel_reg; |
98 | rdesc->enable_mask = SY8827N_BUCK_EN; |
99 | rdesc->min_uV = SY8827N_VSELMIN; |
100 | rdesc->uV_step = SY8827N_VSELSTEP; |
101 | rdesc->vsel_reg = di->vsel_reg; |
102 | rdesc->vsel_mask = rdesc->n_voltages - 1; |
103 | rdesc->owner = THIS_MODULE; |
104 | |
105 | rdev = devm_regulator_register(dev: di->dev, regulator_desc: &di->desc, config); |
106 | return PTR_ERR_OR_ZERO(ptr: rdev); |
107 | } |
108 | |
109 | static bool sy8827n_volatile_reg(struct device *dev, unsigned int reg) |
110 | { |
111 | if (reg == SY8827N_PGOOD) |
112 | return true; |
113 | return false; |
114 | } |
115 | |
116 | static const struct regmap_config sy8827n_regmap_config = { |
117 | .reg_bits = 8, |
118 | .val_bits = 8, |
119 | .volatile_reg = sy8827n_volatile_reg, |
120 | .num_reg_defaults_raw = SY8827N_MAX, |
121 | .cache_type = REGCACHE_FLAT, |
122 | }; |
123 | |
124 | static int sy8827n_i2c_probe(struct i2c_client *client) |
125 | { |
126 | struct device *dev = &client->dev; |
127 | struct device_node *np = dev->of_node; |
128 | struct sy8827n_device_info *di; |
129 | struct regulator_config config = { }; |
130 | struct regmap *regmap; |
131 | int ret; |
132 | |
133 | di = devm_kzalloc(dev, size: sizeof(struct sy8827n_device_info), GFP_KERNEL); |
134 | if (!di) |
135 | return -ENOMEM; |
136 | |
137 | di->regulator = of_get_regulator_init_data(dev, node: np, desc: &di->desc); |
138 | if (!di->regulator) { |
139 | dev_err(dev, "Platform data not found!\n" ); |
140 | return -EINVAL; |
141 | } |
142 | |
143 | di->en_gpio = devm_gpiod_get_optional(dev, con_id: "enable" , flags: GPIOD_OUT_HIGH); |
144 | if (IS_ERR(ptr: di->en_gpio)) |
145 | return PTR_ERR(ptr: di->en_gpio); |
146 | |
147 | if (of_property_read_bool(np, propname: "silergy,vsel-state-high" )) |
148 | di->vsel_reg = SY8827N_VSEL1; |
149 | else |
150 | di->vsel_reg = SY8827N_VSEL0; |
151 | |
152 | di->dev = dev; |
153 | |
154 | regmap = devm_regmap_init_i2c(client, &sy8827n_regmap_config); |
155 | if (IS_ERR(ptr: regmap)) { |
156 | dev_err(dev, "Failed to allocate regmap!\n" ); |
157 | return PTR_ERR(ptr: regmap); |
158 | } |
159 | i2c_set_clientdata(client, data: di); |
160 | |
161 | config.dev = di->dev; |
162 | config.init_data = di->regulator; |
163 | config.regmap = regmap; |
164 | config.driver_data = di; |
165 | config.of_node = np; |
166 | |
167 | ret = sy8827n_regulator_register(di, config: &config); |
168 | if (ret < 0) |
169 | dev_err(dev, "Failed to register regulator!\n" ); |
170 | return ret; |
171 | } |
172 | |
173 | static const struct of_device_id sy8827n_dt_ids[] = { |
174 | { |
175 | .compatible = "silergy,sy8827n" , |
176 | }, |
177 | { } |
178 | }; |
179 | MODULE_DEVICE_TABLE(of, sy8827n_dt_ids); |
180 | |
181 | static const struct i2c_device_id sy8827n_id[] = { |
182 | { "sy8827n" , }, |
183 | { }, |
184 | }; |
185 | MODULE_DEVICE_TABLE(i2c, sy8827n_id); |
186 | |
187 | static struct i2c_driver sy8827n_regulator_driver = { |
188 | .driver = { |
189 | .name = "sy8827n-regulator" , |
190 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
191 | .of_match_table = sy8827n_dt_ids, |
192 | }, |
193 | .probe = sy8827n_i2c_probe, |
194 | .id_table = sy8827n_id, |
195 | }; |
196 | module_i2c_driver(sy8827n_regulator_driver); |
197 | |
198 | MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>" ); |
199 | MODULE_DESCRIPTION("SY8827N regulator driver" ); |
200 | MODULE_LICENSE("GPL v2" ); |
201 | |