1 /*
2 * isl6271a-regulator.c
3 *
4 * Support for Intersil ISL6271A voltage regulator
5 *
6 * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation version 2.
11 *
12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
13 * whether express or implied; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 */
17
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 /* PMIC details */
32 struct isl_pmic {
33 struct i2c_client *client;
34 struct mutex mtx;
35 };
36
isl6271a_get_voltage_sel(struct regulator_dev * dev)37 static int isl6271a_get_voltage_sel(struct regulator_dev *dev)
38 {
39 struct isl_pmic *pmic = rdev_get_drvdata(dev);
40 int idx;
41
42 mutex_lock(&pmic->mtx);
43
44 idx = i2c_smbus_read_byte(pmic->client);
45 if (idx < 0)
46 dev_err(&pmic->client->dev, "Error getting voltage\n");
47
48 mutex_unlock(&pmic->mtx);
49 return idx;
50 }
51
isl6271a_set_voltage_sel(struct regulator_dev * dev,unsigned selector)52 static int isl6271a_set_voltage_sel(struct regulator_dev *dev,
53 unsigned selector)
54 {
55 struct isl_pmic *pmic = rdev_get_drvdata(dev);
56 int err;
57
58 mutex_lock(&pmic->mtx);
59
60 err = i2c_smbus_write_byte(pmic->client, selector);
61 if (err < 0)
62 dev_err(&pmic->client->dev, "Error setting voltage\n");
63
64 mutex_unlock(&pmic->mtx);
65 return err;
66 }
67
68 static const struct regulator_ops isl_core_ops = {
69 .get_voltage_sel = isl6271a_get_voltage_sel,
70 .set_voltage_sel = isl6271a_set_voltage_sel,
71 .list_voltage = regulator_list_voltage_linear,
72 .map_voltage = regulator_map_voltage_linear,
73 };
74
75 static const struct regulator_ops isl_fixed_ops = {
76 .list_voltage = regulator_list_voltage_linear,
77 };
78
79 static const struct regulator_desc isl_rd[] = {
80 {
81 .name = "Core Buck",
82 .id = 0,
83 .n_voltages = 16,
84 .ops = &isl_core_ops,
85 .type = REGULATOR_VOLTAGE,
86 .owner = THIS_MODULE,
87 .min_uV = ISL6271A_VOLTAGE_MIN,
88 .uV_step = ISL6271A_VOLTAGE_STEP,
89 }, {
90 .name = "LDO1",
91 .id = 1,
92 .n_voltages = 1,
93 .ops = &isl_fixed_ops,
94 .type = REGULATOR_VOLTAGE,
95 .owner = THIS_MODULE,
96 .min_uV = 1100000,
97 }, {
98 .name = "LDO2",
99 .id = 2,
100 .n_voltages = 1,
101 .ops = &isl_fixed_ops,
102 .type = REGULATOR_VOLTAGE,
103 .owner = THIS_MODULE,
104 .min_uV = 1300000,
105 },
106 };
107
isl6271a_probe(struct i2c_client * i2c,const struct i2c_device_id * id)108 static int isl6271a_probe(struct i2c_client *i2c,
109 const struct i2c_device_id *id)
110 {
111 struct regulator_dev *rdev;
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 rdev = devm_regulator_register(&i2c->dev, &isl_rd[i], &config);
137 if (IS_ERR(rdev)) {
138 dev_err(&i2c->dev, "failed to register %s\n", id->name);
139 return PTR_ERR(rdev);
140 }
141 }
142
143 i2c_set_clientdata(i2c, pmic);
144
145 return 0;
146 }
147
148 static const struct i2c_device_id isl6271a_id[] = {
149 {.name = "isl6271a", 0 },
150 { },
151 };
152
153 MODULE_DEVICE_TABLE(i2c, isl6271a_id);
154
155 static struct i2c_driver isl6271a_i2c_driver = {
156 .driver = {
157 .name = "isl6271a",
158 },
159 .probe = isl6271a_probe,
160 .id_table = isl6271a_id,
161 };
162
isl6271a_init(void)163 static int __init isl6271a_init(void)
164 {
165 return i2c_add_driver(&isl6271a_i2c_driver);
166 }
167
isl6271a_cleanup(void)168 static void __exit isl6271a_cleanup(void)
169 {
170 i2c_del_driver(&isl6271a_i2c_driver);
171 }
172
173 subsys_initcall(isl6271a_init);
174 module_exit(isl6271a_cleanup);
175
176 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
177 MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
178 MODULE_LICENSE("GPL v2");
179