]>
Commit | Line | Data |
---|---|---|
4444a1c1 MR |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // | |
3 | // Copyright (c) 2019 five technologies GmbH | |
4 | // Author: Markus Reichl <m.reichl@fivetechno.de> | |
5 | ||
6 | #include <linux/module.h> | |
7 | #include <linux/i2c.h> | |
8 | #include <linux/of.h> | |
9 | #include <linux/regulator/driver.h> | |
10 | #include <linux/regmap.h> | |
11 | ||
12 | ||
13 | #define VOL_MIN_IDX 0x00 | |
14 | #define VOL_MAX_IDX 0x7ff | |
15 | ||
16 | /* Register definitions */ | |
17 | #define MP8859_VOUT_L_REG 0 //3 lo Bits | |
18 | #define MP8859_VOUT_H_REG 1 //8 hi Bits | |
19 | #define MP8859_VOUT_GO_REG 2 | |
20 | #define MP8859_IOUT_LIM_REG 3 | |
21 | #define MP8859_CTL1_REG 4 | |
22 | #define MP8859_CTL2_REG 5 | |
23 | #define MP8859_RESERVED1_REG 6 | |
24 | #define MP8859_RESERVED2_REG 7 | |
25 | #define MP8859_RESERVED3_REG 8 | |
26 | #define MP8859_STATUS_REG 9 | |
27 | #define MP8859_INTERRUPT_REG 0x0A | |
28 | #define MP8859_MASK_REG 0x0B | |
29 | #define MP8859_ID1_REG 0x0C | |
30 | #define MP8859_MFR_ID_REG 0x27 | |
31 | #define MP8859_DEV_ID_REG 0x28 | |
32 | #define MP8859_IC_REV_REG 0x29 | |
33 | ||
34 | #define MP8859_MAX_REG 0x29 | |
35 | ||
36 | #define MP8859_GO_BIT 0x01 | |
37 | ||
38 | ||
39 | static int mp8859_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel) | |
40 | { | |
41 | int ret; | |
42 | ||
43 | ret = regmap_write(rdev->regmap, MP8859_VOUT_L_REG, sel & 0x7); | |
44 | ||
45 | if (ret) | |
46 | return ret; | |
47 | ret = regmap_write(rdev->regmap, MP8859_VOUT_H_REG, sel >> 3); | |
48 | ||
49 | if (ret) | |
50 | return ret; | |
51 | ret = regmap_update_bits(rdev->regmap, MP8859_VOUT_GO_REG, | |
52 | MP8859_GO_BIT, 1); | |
53 | return ret; | |
54 | } | |
55 | ||
56 | static int mp8859_get_voltage_sel(struct regulator_dev *rdev) | |
57 | { | |
58 | unsigned int val_tmp; | |
59 | unsigned int val; | |
60 | int ret; | |
61 | ||
62 | ret = regmap_read(rdev->regmap, MP8859_VOUT_H_REG, &val_tmp); | |
63 | ||
64 | if (ret) | |
65 | return ret; | |
66 | val = val_tmp << 3; | |
67 | ||
68 | ret = regmap_read(rdev->regmap, MP8859_VOUT_L_REG, &val_tmp); | |
69 | ||
70 | if (ret) | |
71 | return ret; | |
72 | val |= val_tmp & 0x07; | |
73 | return val; | |
74 | } | |
75 | ||
60ab7f41 | 76 | static const struct linear_range mp8859_dcdc_ranges[] = { |
4444a1c1 MR |
77 | REGULATOR_LINEAR_RANGE(0, VOL_MIN_IDX, VOL_MAX_IDX, 10000), |
78 | }; | |
79 | ||
80 | static const struct regmap_config mp8859_regmap = { | |
81 | .reg_bits = 8, | |
82 | .val_bits = 8, | |
83 | .max_register = MP8859_MAX_REG, | |
84 | .cache_type = REGCACHE_RBTREE, | |
85 | }; | |
86 | ||
87 | static const struct regulator_ops mp8859_ops = { | |
88 | .set_voltage_sel = mp8859_set_voltage_sel, | |
89 | .get_voltage_sel = mp8859_get_voltage_sel, | |
90 | .list_voltage = regulator_list_voltage_linear_range, | |
91 | }; | |
92 | ||
93 | static const struct regulator_desc mp8859_regulators[] = { | |
94 | { | |
95 | .id = 0, | |
96 | .type = REGULATOR_VOLTAGE, | |
97 | .name = "mp8859_dcdc", | |
4d49177f | 98 | .supply_name = "vin", |
4444a1c1 MR |
99 | .of_match = of_match_ptr("mp8859_dcdc"), |
100 | .n_voltages = VOL_MAX_IDX + 1, | |
101 | .linear_ranges = mp8859_dcdc_ranges, | |
102 | .n_linear_ranges = 1, | |
103 | .ops = &mp8859_ops, | |
104 | .owner = THIS_MODULE, | |
105 | }, | |
106 | }; | |
107 | ||
108 | static int mp8859_i2c_probe(struct i2c_client *i2c) | |
109 | { | |
110 | int ret; | |
111 | struct regulator_config config = {.dev = &i2c->dev}; | |
112 | struct regmap *regmap = devm_regmap_init_i2c(i2c, &mp8859_regmap); | |
113 | struct regulator_dev *rdev; | |
114 | ||
115 | if (IS_ERR(regmap)) { | |
116 | ret = PTR_ERR(regmap); | |
117 | dev_err(&i2c->dev, "regmap init failed: %d\n", ret); | |
118 | return ret; | |
119 | } | |
120 | rdev = devm_regulator_register(&i2c->dev, &mp8859_regulators[0], | |
121 | &config); | |
122 | ||
123 | if (IS_ERR(rdev)) { | |
124 | ret = PTR_ERR(rdev); | |
125 | dev_err(&i2c->dev, "failed to register %s: %d\n", | |
126 | mp8859_regulators[0].name, ret); | |
b8338051 DC |
127 | return ret; |
128 | } | |
4444a1c1 MR |
129 | return 0; |
130 | } | |
131 | ||
132 | static const struct of_device_id mp8859_dt_id[] = { | |
133 | {.compatible = "mps,mp8859"}, | |
134 | {}, | |
135 | }; | |
136 | MODULE_DEVICE_TABLE(of, mp8859_dt_id); | |
137 | ||
138 | static const struct i2c_device_id mp8859_i2c_id[] = { | |
139 | { "mp8859", }, | |
140 | { }, | |
141 | }; | |
142 | MODULE_DEVICE_TABLE(i2c, mp8859_i2c_id); | |
143 | ||
144 | static struct i2c_driver mp8859_regulator_driver = { | |
145 | .driver = { | |
146 | .name = "mp8859", | |
147 | .of_match_table = of_match_ptr(mp8859_dt_id), | |
148 | }, | |
149 | .probe_new = mp8859_i2c_probe, | |
150 | .id_table = mp8859_i2c_id, | |
151 | }; | |
152 | ||
153 | module_i2c_driver(mp8859_regulator_driver); | |
154 | ||
155 | MODULE_DESCRIPTION("Monolithic Power Systems MP8859 voltage regulator driver"); | |
156 | MODULE_AUTHOR("Markus Reichl <m.reichl@fivetechno.de>"); | |
157 | MODULE_LICENSE("GPL v2"); |