1
2
3
4
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
17#define MP8859_VOUT_L_REG 0
18#define MP8859_VOUT_H_REG 1
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
39static 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
56static 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
76static const struct linear_range mp8859_dcdc_ranges[] = {
77 REGULATOR_LINEAR_RANGE(0, VOL_MIN_IDX, VOL_MAX_IDX, 10000),
78};
79
80static 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
87static 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
93static const struct regulator_desc mp8859_regulators[] = {
94 {
95 .id = 0,
96 .type = REGULATOR_VOLTAGE,
97 .name = "mp8859_dcdc",
98 .supply_name = "vin",
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
108static 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);
127 return ret;
128 }
129 return 0;
130}
131
132static const struct of_device_id mp8859_dt_id[] = {
133 {.compatible = "mps,mp8859"},
134 {},
135};
136MODULE_DEVICE_TABLE(of, mp8859_dt_id);
137
138static const struct i2c_device_id mp8859_i2c_id[] = {
139 { "mp8859", },
140 { },
141};
142MODULE_DEVICE_TABLE(i2c, mp8859_i2c_id);
143
144static 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
153module_i2c_driver(mp8859_regulator_driver);
154
155MODULE_DESCRIPTION("Monolithic Power Systems MP8859 voltage regulator driver");
156MODULE_AUTHOR("Markus Reichl <m.reichl@fivetechno.de>");
157MODULE_LICENSE("GPL v2");
158
