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38fc6f29 JZ |
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_device.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 | ||
23 | #define SY8827N_NVOLTAGES 64 | |
24 | #define SY8827N_VSELMIN 600000 | |
25 | #define SY8827N_VSELSTEP 12500 | |
26 | ||
27 | struct sy8827n_device_info { | |
28 | struct device *dev; | |
29 | struct regulator_desc desc; | |
30 | struct regulator_init_data *regulator; | |
31 | struct gpio_desc *en_gpio; | |
32 | unsigned int vsel_reg; | |
33 | }; | |
34 | ||
35 | static int sy8827n_set_mode(struct regulator_dev *rdev, unsigned int mode) | |
36 | { | |
37 | struct sy8827n_device_info *di = rdev_get_drvdata(rdev); | |
38 | ||
39 | switch (mode) { | |
40 | case REGULATOR_MODE_FAST: | |
41 | regmap_update_bits(rdev->regmap, di->vsel_reg, | |
42 | SY8827N_MODE, SY8827N_MODE); | |
43 | break; | |
44 | case REGULATOR_MODE_NORMAL: | |
45 | regmap_update_bits(rdev->regmap, di->vsel_reg, | |
46 | SY8827N_MODE, 0); | |
47 | break; | |
48 | default: | |
49 | return -EINVAL; | |
50 | } | |
51 | return 0; | |
52 | } | |
53 | ||
54 | static unsigned int sy8827n_get_mode(struct regulator_dev *rdev) | |
55 | { | |
56 | struct sy8827n_device_info *di = rdev_get_drvdata(rdev); | |
57 | u32 val; | |
58 | int ret = 0; | |
59 | ||
60 | ret = regmap_read(rdev->regmap, di->vsel_reg, &val); | |
61 | if (ret < 0) | |
62 | return ret; | |
63 | if (val & SY8827N_MODE) | |
64 | return REGULATOR_MODE_FAST; | |
65 | else | |
66 | return REGULATOR_MODE_NORMAL; | |
67 | } | |
68 | ||
69 | static const struct regulator_ops sy8827n_regulator_ops = { | |
70 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
71 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
72 | .set_voltage_time_sel = regulator_set_voltage_time_sel, | |
73 | .map_voltage = regulator_map_voltage_linear, | |
74 | .list_voltage = regulator_list_voltage_linear, | |
75 | .enable = regulator_enable_regmap, | |
76 | .disable = regulator_disable_regmap, | |
77 | .is_enabled = regulator_is_enabled_regmap, | |
78 | .set_mode = sy8827n_set_mode, | |
79 | .get_mode = sy8827n_get_mode, | |
80 | }; | |
81 | ||
82 | static int sy8827n_regulator_register(struct sy8827n_device_info *di, | |
83 | struct regulator_config *config) | |
84 | { | |
85 | struct regulator_desc *rdesc = &di->desc; | |
86 | struct regulator_dev *rdev; | |
87 | ||
88 | rdesc->name = "sy8827n-reg"; | |
89 | rdesc->supply_name = "vin"; | |
90 | rdesc->ops = &sy8827n_regulator_ops; | |
91 | rdesc->type = REGULATOR_VOLTAGE; | |
92 | rdesc->n_voltages = SY8827N_NVOLTAGES; | |
93 | rdesc->enable_reg = di->vsel_reg; | |
94 | rdesc->enable_mask = SY8827N_BUCK_EN; | |
95 | rdesc->min_uV = SY8827N_VSELMIN; | |
96 | rdesc->uV_step = SY8827N_VSELSTEP; | |
97 | rdesc->vsel_reg = di->vsel_reg; | |
98 | rdesc->vsel_mask = rdesc->n_voltages - 1; | |
99 | rdesc->owner = THIS_MODULE; | |
100 | ||
101 | rdev = devm_regulator_register(di->dev, &di->desc, config); | |
102 | return PTR_ERR_OR_ZERO(rdev); | |
103 | } | |
104 | ||
105 | static const struct regmap_config sy8827n_regmap_config = { | |
106 | .reg_bits = 8, | |
107 | .val_bits = 8, | |
108 | }; | |
109 | ||
110 | static int sy8827n_i2c_probe(struct i2c_client *client) | |
111 | { | |
112 | struct device *dev = &client->dev; | |
113 | struct device_node *np = dev->of_node; | |
114 | struct sy8827n_device_info *di; | |
115 | struct regulator_config config = { }; | |
116 | struct regmap *regmap; | |
117 | int ret; | |
118 | ||
119 | di = devm_kzalloc(dev, sizeof(struct sy8827n_device_info), GFP_KERNEL); | |
120 | if (!di) | |
121 | return -ENOMEM; | |
122 | ||
123 | di->regulator = of_get_regulator_init_data(dev, np, &di->desc); | |
124 | if (!di->regulator) { | |
125 | dev_err(dev, "Platform data not found!\n"); | |
126 | return -EINVAL; | |
127 | } | |
128 | ||
129 | di->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH); | |
130 | if (IS_ERR(di->en_gpio)) | |
131 | return PTR_ERR(di->en_gpio); | |
132 | ||
133 | if (of_property_read_bool(np, "silergy,vsel-state-high")) | |
134 | di->vsel_reg = SY8827N_VSEL1; | |
135 | else | |
136 | di->vsel_reg = SY8827N_VSEL0; | |
137 | ||
138 | di->dev = dev; | |
139 | ||
140 | regmap = devm_regmap_init_i2c(client, &sy8827n_regmap_config); | |
141 | if (IS_ERR(regmap)) { | |
142 | dev_err(dev, "Failed to allocate regmap!\n"); | |
143 | return PTR_ERR(regmap); | |
144 | } | |
145 | i2c_set_clientdata(client, di); | |
146 | ||
147 | config.dev = di->dev; | |
148 | config.init_data = di->regulator; | |
149 | config.regmap = regmap; | |
150 | config.driver_data = di; | |
151 | config.of_node = np; | |
152 | ||
153 | ret = sy8827n_regulator_register(di, &config); | |
154 | if (ret < 0) | |
155 | dev_err(dev, "Failed to register regulator!\n"); | |
156 | return ret; | |
157 | } | |
158 | ||
a16138a3 | 159 | #ifdef CONFIG_OF |
38fc6f29 JZ |
160 | static const struct of_device_id sy8827n_dt_ids[] = { |
161 | { | |
162 | .compatible = "silergy,sy8827n", | |
163 | }, | |
164 | { } | |
165 | }; | |
166 | MODULE_DEVICE_TABLE(of, sy8827n_dt_ids); | |
a16138a3 | 167 | #endif |
38fc6f29 JZ |
168 | |
169 | static const struct i2c_device_id sy8827n_id[] = { | |
170 | { "sy8827n", }, | |
171 | { }, | |
172 | }; | |
173 | MODULE_DEVICE_TABLE(i2c, sy8827n_id); | |
174 | ||
175 | static struct i2c_driver sy8827n_regulator_driver = { | |
176 | .driver = { | |
177 | .name = "sy8827n-regulator", | |
178 | .of_match_table = of_match_ptr(sy8827n_dt_ids), | |
179 | }, | |
180 | .probe_new = sy8827n_i2c_probe, | |
181 | .id_table = sy8827n_id, | |
182 | }; | |
183 | module_i2c_driver(sy8827n_regulator_driver); | |
184 | ||
185 | MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>"); | |
186 | MODULE_DESCRIPTION("SY8827N regulator driver"); | |
187 | MODULE_LICENSE("GPL v2"); |