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21#include <linux/err.h>
22#include <linux/i2c.h>
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/slab.h>
26#include <linux/regulator/driver.h>
27#include <linux/regulator/machine.h>
28#include <linux/regulator/of_regulator.h>
29#include <linux/regmap.h>
30
31#include "da9210-regulator.h"
32
33struct da9210 {
34 struct regulator_dev *rdev;
35 struct regmap *regmap;
36};
37
38static const struct regmap_config da9210_regmap_config = {
39 .reg_bits = 8,
40 .val_bits = 8,
41};
42
43static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
44 int max_uA);
45static int da9210_get_current_limit(struct regulator_dev *rdev);
46
47static struct regulator_ops da9210_buck_ops = {
48 .enable = regulator_enable_regmap,
49 .disable = regulator_disable_regmap,
50 .is_enabled = regulator_is_enabled_regmap,
51 .set_voltage_sel = regulator_set_voltage_sel_regmap,
52 .get_voltage_sel = regulator_get_voltage_sel_regmap,
53 .list_voltage = regulator_list_voltage_linear,
54 .set_current_limit = da9210_set_current_limit,
55 .get_current_limit = da9210_get_current_limit,
56};
57
58
59#define DA9210_MIN_MV 300
60#define DA9210_MAX_MV 1570
61#define DA9210_STEP_MV 10
62
63
64static const int da9210_buck_limits[] = {
65 1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000,
66 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000
67};
68
69static const struct regulator_desc da9210_reg = {
70 .name = "DA9210",
71 .id = 0,
72 .ops = &da9210_buck_ops,
73 .type = REGULATOR_VOLTAGE,
74 .n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1,
75 .min_uV = (DA9210_MIN_MV * 1000),
76 .uV_step = (DA9210_STEP_MV * 1000),
77 .vsel_reg = DA9210_REG_VBUCK_A,
78 .vsel_mask = DA9210_VBUCK_MASK,
79 .enable_reg = DA9210_REG_BUCK_CONT,
80 .enable_mask = DA9210_BUCK_EN,
81 .owner = THIS_MODULE,
82};
83
84static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
85 int max_uA)
86{
87 struct da9210 *chip = rdev_get_drvdata(rdev);
88 unsigned int sel;
89 int i;
90
91
92 for (i = ARRAY_SIZE(da9210_buck_limits)-1; i >= 0; i--) {
93 if (min_uA <= da9210_buck_limits[i] &&
94 max_uA >= da9210_buck_limits[i]) {
95 sel = i;
96 sel = sel << DA9210_BUCK_ILIM_SHIFT;
97 return regmap_update_bits(chip->regmap,
98 DA9210_REG_BUCK_ILIM,
99 DA9210_BUCK_ILIM_MASK, sel);
100 }
101 }
102
103 return -EINVAL;
104}
105
106static int da9210_get_current_limit(struct regulator_dev *rdev)
107{
108 struct da9210 *chip = rdev_get_drvdata(rdev);
109 unsigned int data;
110 unsigned int sel;
111 int ret;
112
113 ret = regmap_read(chip->regmap, DA9210_REG_BUCK_ILIM, &data);
114 if (ret < 0)
115 return ret;
116
117
118 sel = (data & DA9210_BUCK_ILIM_MASK) >> DA9210_BUCK_ILIM_SHIFT;
119
120 return da9210_buck_limits[sel];
121}
122
123
124
125
126static int da9210_i2c_probe(struct i2c_client *i2c,
127 const struct i2c_device_id *id)
128{
129 struct da9210 *chip;
130 struct device *dev = &i2c->dev;
131 struct da9210_pdata *pdata = dev_get_platdata(dev);
132 struct regulator_dev *rdev = NULL;
133 struct regulator_config config = { };
134 int error;
135
136 chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
137 if (!chip)
138 return -ENOMEM;
139
140 chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
141 if (IS_ERR(chip->regmap)) {
142 error = PTR_ERR(chip->regmap);
143 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
144 error);
145 return error;
146 }
147
148 config.dev = &i2c->dev;
149 config.init_data = pdata ? &pdata->da9210_constraints :
150 of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
151 config.driver_data = chip;
152 config.regmap = chip->regmap;
153 config.of_node = dev->of_node;
154
155
156 error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0);
157 if (!error)
158 error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0);
159 if (error) {
160 dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error);
161 return error;
162 }
163
164 rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
165 if (IS_ERR(rdev)) {
166 dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
167 return PTR_ERR(rdev);
168 }
169
170 chip->rdev = rdev;
171
172 i2c_set_clientdata(i2c, chip);
173
174 return 0;
175}
176
177static const struct i2c_device_id da9210_i2c_id[] = {
178 {"da9210", 0},
179 {},
180};
181
182MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
183
184static struct i2c_driver da9210_regulator_driver = {
185 .driver = {
186 .name = "da9210",
187 .owner = THIS_MODULE,
188 },
189 .probe = da9210_i2c_probe,
190 .id_table = da9210_i2c_id,
191};
192
193module_i2c_driver(da9210_regulator_driver);
194
195MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
196MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
197MODULE_LICENSE("GPL v2");
198
