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18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/init.h>
21#include <linux/err.h>
22#include <linux/platform_device.h>
23#include <linux/regulator/driver.h>
24#include <linux/i2c.h>
25#include <linux/slab.h>
26
27#define ISL6271A_VOLTAGE_MIN 850000
28#define ISL6271A_VOLTAGE_MAX 1600000
29#define ISL6271A_VOLTAGE_STEP 50000
30
31
32struct isl_pmic {
33 struct i2c_client *client;
34 struct regulator_dev *rdev[3];
35 struct mutex mtx;
36};
37
38static int isl6271a_get_voltage_sel(struct regulator_dev *dev)
39{
40 struct isl_pmic *pmic = rdev_get_drvdata(dev);
41 int idx;
42
43 mutex_lock(&pmic->mtx);
44
45 idx = i2c_smbus_read_byte(pmic->client);
46 if (idx < 0)
47 dev_err(&pmic->client->dev, "Error getting voltage\n");
48
49 mutex_unlock(&pmic->mtx);
50 return idx;
51}
52
53static int isl6271a_set_voltage_sel(struct regulator_dev *dev,
54 unsigned selector)
55{
56 struct isl_pmic *pmic = rdev_get_drvdata(dev);
57 int err;
58
59 mutex_lock(&pmic->mtx);
60
61 err = i2c_smbus_write_byte(pmic->client, selector);
62 if (err < 0)
63 dev_err(&pmic->client->dev, "Error setting voltage\n");
64
65 mutex_unlock(&pmic->mtx);
66 return err;
67}
68
69static struct regulator_ops isl_core_ops = {
70 .get_voltage_sel = isl6271a_get_voltage_sel,
71 .set_voltage_sel = isl6271a_set_voltage_sel,
72 .list_voltage = regulator_list_voltage_linear,
73 .map_voltage = regulator_map_voltage_linear,
74};
75
76static struct regulator_ops isl_fixed_ops = {
77 .list_voltage = regulator_list_voltage_linear,
78};
79
80static const struct regulator_desc isl_rd[] = {
81 {
82 .name = "Core Buck",
83 .id = 0,
84 .n_voltages = 16,
85 .ops = &isl_core_ops,
86 .type = REGULATOR_VOLTAGE,
87 .owner = THIS_MODULE,
88 .min_uV = ISL6271A_VOLTAGE_MIN,
89 .uV_step = ISL6271A_VOLTAGE_STEP,
90 }, {
91 .name = "LDO1",
92 .id = 1,
93 .n_voltages = 1,
94 .ops = &isl_fixed_ops,
95 .type = REGULATOR_VOLTAGE,
96 .owner = THIS_MODULE,
97 .min_uV = 1100000,
98 }, {
99 .name = "LDO2",
100 .id = 2,
101 .n_voltages = 1,
102 .ops = &isl_fixed_ops,
103 .type = REGULATOR_VOLTAGE,
104 .owner = THIS_MODULE,
105 .min_uV = 1300000,
106 },
107};
108
109static int isl6271a_probe(struct i2c_client *i2c,
110 const struct i2c_device_id *id)
111{
112 struct regulator_config config = { };
113 struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
114 struct isl_pmic *pmic;
115 int i;
116
117 if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
118 return -EIO;
119
120 pmic = devm_kzalloc(&i2c->dev, sizeof(struct isl_pmic), GFP_KERNEL);
121 if (!pmic)
122 return -ENOMEM;
123
124 pmic->client = i2c;
125
126 mutex_init(&pmic->mtx);
127
128 for (i = 0; i < 3; i++) {
129 config.dev = &i2c->dev;
130 if (i == 0)
131 config.init_data = init_data;
132 else
133 config.init_data = NULL;
134 config.driver_data = pmic;
135
136 pmic->rdev[i] = devm_regulator_register(&i2c->dev, &isl_rd[i],
137 &config);
138 if (IS_ERR(pmic->rdev[i])) {
139 dev_err(&i2c->dev, "failed to register %s\n", id->name);
140 return PTR_ERR(pmic->rdev[i]);
141 }
142 }
143
144 i2c_set_clientdata(i2c, pmic);
145
146 return 0;
147}
148
149static const struct i2c_device_id isl6271a_id[] = {
150 {.name = "isl6271a", 0 },
151 { },
152};
153
154MODULE_DEVICE_TABLE(i2c, isl6271a_id);
155
156static struct i2c_driver isl6271a_i2c_driver = {
157 .driver = {
158 .name = "isl6271a",
159 },
160 .probe = isl6271a_probe,
161 .id_table = isl6271a_id,
162};
163
164static int __init isl6271a_init(void)
165{
166 return i2c_add_driver(&isl6271a_i2c_driver);
167}
168
169static void __exit isl6271a_cleanup(void)
170{
171 i2c_del_driver(&isl6271a_i2c_driver);
172}
173
174subsys_initcall(isl6271a_init);
175module_exit(isl6271a_cleanup);
176
177MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
178MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
179MODULE_LICENSE("GPL v2");
180
