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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> | |
045a44d4 | 12 | #include <linux/of.h> |
38fc6f29 JZ |
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 | |
6bdd1c67 JZ |
22 | #define SY8827N_ID1 3 |
23 | #define SY8827N_ID2 4 | |
24 | #define SY8827N_PGOOD 5 | |
25 | #define SY8827N_MAX (SY8827N_PGOOD + 1) | |
38fc6f29 JZ |
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(rdev->regmap, di->vsel_reg, | |
46 | SY8827N_MODE, SY8827N_MODE); | |
47 | break; | |
48 | case REGULATOR_MODE_NORMAL: | |
49 | regmap_update_bits(rdev->regmap, di->vsel_reg, | |
50 | SY8827N_MODE, 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(rdev->regmap, di->vsel_reg, &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(di->dev, &di->desc, config); | |
106 | return PTR_ERR_OR_ZERO(rdev); | |
107 | } | |
108 | ||
6bdd1c67 JZ |
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 | ||
38fc6f29 JZ |
116 | static const struct regmap_config sy8827n_regmap_config = { |
117 | .reg_bits = 8, | |
118 | .val_bits = 8, | |
6bdd1c67 JZ |
119 | .volatile_reg = sy8827n_volatile_reg, |
120 | .num_reg_defaults_raw = SY8827N_MAX, | |
121 | .cache_type = REGCACHE_FLAT, | |
38fc6f29 JZ |
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, sizeof(struct sy8827n_device_info), GFP_KERNEL); | |
134 | if (!di) | |
135 | return -ENOMEM; | |
136 | ||
137 | di->regulator = of_get_regulator_init_data(dev, np, &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, "enable", GPIOD_OUT_HIGH); | |
144 | if (IS_ERR(di->en_gpio)) | |
145 | return PTR_ERR(di->en_gpio); | |
146 | ||
147 | if (of_property_read_bool(np, "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(regmap)) { | |
156 | dev_err(dev, "Failed to allocate regmap!\n"); | |
157 | return PTR_ERR(regmap); | |
158 | } | |
159 | i2c_set_clientdata(client, 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); | |
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", | |
67dc71c6 | 190 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
c4b02c92 | 191 | .of_match_table = sy8827n_dt_ids, |
38fc6f29 | 192 | }, |
964e1865 | 193 | .probe = sy8827n_i2c_probe, |
38fc6f29 JZ |
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"); |