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1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* | |
3 | * Copyright (c) 2021, The Linux Foundation. All rights reserved. | |
4 | * Copyright (c) 2022, Linaro Ltd. | |
5 | */ | |
6 | ||
d5b4c8b9 | 7 | #include <linux/bitfield.h> |
047ebaff BA |
8 | #include <linux/gpio/consumer.h> |
9 | #include <linux/i2c.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/of_platform.h> | |
12 | #include <linux/regmap.h> | |
13 | #include <linux/regulator/driver.h> | |
14 | #include <linux/regulator/machine.h> | |
15 | #include <linux/regulator/of_regulator.h> | |
16 | ||
17 | #define MAX20411_UV_STEP 6250 | |
18 | #define MAX20411_BASE_UV 243750 | |
19 | #define MAX20411_MIN_SEL 41 /* 0.5V */ | |
20 | #define MAX20411_MAX_SEL 165 /* 1.275V */ | |
21 | #define MAX20411_VID_OFFSET 0x7 | |
22 | #define MAX20411_VID_MASK 0xff | |
23 | #define MAX20411_SLEW_OFFSET 0x6 | |
24 | #define MAX20411_SLEW_DVS_MASK 0xc | |
25 | #define MAX20411_SLEW_SR_MASK 0x3 | |
26 | ||
27 | struct max20411 { | |
28 | struct device *dev; | |
29 | struct device_node *of_node; | |
30 | struct regulator_desc desc; | |
31 | struct regulator_dev *rdev; | |
32 | struct regmap *regmap; | |
33 | }; | |
34 | ||
35 | static const unsigned int max20411_slew_rates[] = { 13100, 6600, 3300, 1600 }; | |
36 | ||
37 | static int max20411_enable_time(struct regulator_dev *rdev) | |
38 | { | |
39 | int voltage, rate, ret; | |
40 | unsigned int val; | |
41 | ||
42 | /* get voltage */ | |
43 | ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); | |
44 | if (ret) | |
45 | return ret; | |
46 | ||
47 | val &= rdev->desc->vsel_mask; | |
48 | voltage = regulator_list_voltage_linear(rdev, val); | |
49 | ||
50 | /* get rate */ | |
51 | ret = regmap_read(rdev->regmap, MAX20411_SLEW_OFFSET, &val); | |
52 | if (ret) | |
53 | return ret; | |
54 | ||
55 | val = FIELD_GET(MAX20411_SLEW_SR_MASK, val); | |
56 | rate = max20411_slew_rates[val]; | |
57 | ||
58 | return DIV_ROUND_UP(voltage, rate); | |
59 | } | |
60 | ||
61 | static const struct regmap_config max20411_regmap_config = { | |
62 | .reg_bits = 8, | |
63 | .val_bits = 8, | |
64 | .max_register = 0xe, | |
65 | }; | |
66 | ||
67 | static const struct regulator_ops max20411_ops = { | |
68 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
69 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
70 | .list_voltage = regulator_list_voltage_linear, | |
71 | .enable_time = max20411_enable_time, | |
72 | }; | |
73 | ||
74 | static const struct regulator_desc max20411_desc = { | |
75 | .ops = &max20411_ops, | |
76 | .owner = THIS_MODULE, | |
77 | .type = REGULATOR_VOLTAGE, | |
78 | .supply_name = "vin", | |
79 | .name = "max20411", | |
80 | ||
81 | /* | |
82 | * voltage = 0.24375V + selector * 6.25mV | |
83 | * with valid selector between 41 to 165 (0.5V to 1.275V) | |
84 | */ | |
85 | .min_uV = MAX20411_BASE_UV, | |
86 | .uV_step = MAX20411_UV_STEP, | |
87 | .linear_min_sel = MAX20411_MIN_SEL, | |
9d1c7319 | 88 | .n_voltages = MAX20411_MAX_SEL + 1, |
047ebaff BA |
89 | |
90 | .vsel_reg = MAX20411_VID_OFFSET, | |
91 | .vsel_mask = MAX20411_VID_MASK, | |
92 | ||
93 | .ramp_reg = MAX20411_SLEW_OFFSET, | |
94 | .ramp_mask = MAX20411_SLEW_DVS_MASK, | |
95 | .ramp_delay_table = max20411_slew_rates, | |
96 | .n_ramp_values = ARRAY_SIZE(max20411_slew_rates), | |
97 | }; | |
98 | ||
fad8ddda | 99 | static int max20411_probe(struct i2c_client *client) |
047ebaff BA |
100 | { |
101 | struct regulator_init_data *init_data; | |
102 | struct device *dev = &client->dev; | |
103 | struct regulator_config cfg = {}; | |
104 | struct max20411 *max20411; | |
105 | ||
106 | max20411 = devm_kzalloc(dev, sizeof(*max20411), GFP_KERNEL); | |
107 | if (!max20411) | |
108 | return -ENOMEM; | |
109 | ||
110 | max20411->regmap = devm_regmap_init_i2c(client, &max20411_regmap_config); | |
111 | if (IS_ERR(max20411->regmap)) { | |
112 | dev_err(dev, "Failed to allocate regmap!\n"); | |
113 | return PTR_ERR(max20411->regmap); | |
114 | } | |
115 | ||
116 | max20411->dev = dev; | |
117 | max20411->of_node = dev->of_node; | |
118 | ||
119 | max20411->desc = max20411_desc; | |
120 | init_data = of_get_regulator_init_data(max20411->dev, max20411->of_node, &max20411->desc); | |
121 | if (!init_data) | |
122 | return -ENODATA; | |
123 | ||
124 | cfg.dev = max20411->dev; | |
125 | cfg.init_data = init_data; | |
126 | cfg.of_node = max20411->of_node; | |
127 | cfg.driver_data = max20411; | |
128 | ||
129 | cfg.ena_gpiod = gpiod_get(max20411->dev, "enable", GPIOD_ASIS); | |
130 | if (IS_ERR(cfg.ena_gpiod)) | |
131 | return dev_err_probe(dev, PTR_ERR(cfg.ena_gpiod), | |
132 | "unable to acquire enable gpio\n"); | |
133 | ||
134 | max20411->rdev = devm_regulator_register(max20411->dev, &max20411->desc, &cfg); | |
135 | if (IS_ERR(max20411->rdev)) | |
136 | dev_err(max20411->dev, "Failed to register regulator\n"); | |
137 | ||
138 | return PTR_ERR_OR_ZERO(max20411->rdev); | |
139 | } | |
140 | ||
141 | static const struct of_device_id of_max20411_match_tbl[] = { | |
142 | { .compatible = "maxim,max20411", }, | |
143 | { }, | |
144 | }; | |
145 | MODULE_DEVICE_TABLE(of, of_max20411_match_tbl); | |
146 | ||
147 | static const struct i2c_device_id max20411_id[] = { | |
148 | { "max20411", 0 }, | |
149 | { }, | |
150 | }; | |
151 | MODULE_DEVICE_TABLE(i2c, max20411_id); | |
152 | ||
153 | static struct i2c_driver max20411_i2c_driver = { | |
154 | .driver = { | |
155 | .name = "max20411", | |
156 | .of_match_table = of_max20411_match_tbl, | |
157 | }, | |
fad8ddda | 158 | .probe_new = max20411_probe, |
047ebaff BA |
159 | .id_table = max20411_id, |
160 | }; | |
161 | module_i2c_driver(max20411_i2c_driver); | |
162 | ||
163 | MODULE_LICENSE("GPL"); |