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Marek Vasut51bd6942010-06-13 17:25:51 +02001/*
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/delay.h>
26#include <linux/slab.h>
27
28#define ISL6271A_VOLTAGE_MIN 850000
29#define ISL6271A_VOLTAGE_MAX 1600000
30#define ISL6271A_VOLTAGE_STEP 50000
31
32/* PMIC details */
33struct isl_pmic {
34 struct i2c_client *client;
35 struct regulator_dev *rdev[3];
36 struct mutex mtx;
37};
38
39static int isl6271a_get_voltage(struct regulator_dev *dev)
40{
41 struct isl_pmic *pmic = rdev_get_drvdata(dev);
42 int idx, data;
43
44 mutex_lock(&pmic->mtx);
45
46 idx = i2c_smbus_read_byte(pmic->client);
47 if (idx < 0) {
48 dev_err(&pmic->client->dev, "Error getting voltage\n");
49 data = idx;
50 goto out;
51 }
52
53 /* Convert the data from chip to microvolts */
54 data = ISL6271A_VOLTAGE_MIN + (ISL6271A_VOLTAGE_STEP * (idx & 0xf));
55
56out:
57 mutex_unlock(&pmic->mtx);
58 return data;
59}
60
61static int isl6271a_set_voltage(struct regulator_dev *dev, int minuV, int maxuV)
62{
63 struct isl_pmic *pmic = rdev_get_drvdata(dev);
64 int vsel, err, data;
65
66 if (minuV < ISL6271A_VOLTAGE_MIN || minuV > ISL6271A_VOLTAGE_MAX)
67 return -EINVAL;
68 if (maxuV < ISL6271A_VOLTAGE_MIN || maxuV > ISL6271A_VOLTAGE_MAX)
69 return -EINVAL;
70
71 /* Align to 50000 mV */
72 vsel = minuV - (minuV % ISL6271A_VOLTAGE_STEP);
73
74 /* If the result fell out of [minuV,maxuV] range, put it back */
75 if (vsel < minuV)
76 vsel += ISL6271A_VOLTAGE_STEP;
77
78 /* Convert the microvolts to data for the chip */
79 data = (vsel - ISL6271A_VOLTAGE_MIN) / ISL6271A_VOLTAGE_STEP;
80
81 mutex_lock(&pmic->mtx);
82
83 err = i2c_smbus_write_byte(pmic->client, data);
84 if (err < 0)
85 dev_err(&pmic->client->dev, "Error setting voltage\n");
86
87 mutex_unlock(&pmic->mtx);
88 return err;
89}
90
91static int isl6271a_list_voltage(struct regulator_dev *dev, unsigned selector)
92{
93 return ISL6271A_VOLTAGE_MIN + (ISL6271A_VOLTAGE_STEP * selector);
94}
95
96static struct regulator_ops isl_core_ops = {
97 .get_voltage = isl6271a_get_voltage,
98 .set_voltage = isl6271a_set_voltage,
99 .list_voltage = isl6271a_list_voltage,
100};
101
102static int isl6271a_get_fixed_voltage(struct regulator_dev *dev)
103{
104 int id = rdev_get_id(dev);
105 return (id == 1) ? 1100000 : 1300000;
106}
107
108static int isl6271a_list_fixed_voltage(struct regulator_dev *dev, unsigned selector)
109{
110 int id = rdev_get_id(dev);
111 return (id == 1) ? 1100000 : 1300000;
112}
113
114static struct regulator_ops isl_fixed_ops = {
115 .get_voltage = isl6271a_get_fixed_voltage,
116 .list_voltage = isl6271a_list_fixed_voltage,
117};
118
119static struct regulator_desc isl_rd[] = {
120 {
121 .name = "Core Buck",
122 .id = 0,
123 .n_voltages = 16,
124 .ops = &isl_core_ops,
125 .type = REGULATOR_VOLTAGE,
126 .owner = THIS_MODULE,
127 }, {
128 .name = "LDO1",
129 .id = 1,
130 .n_voltages = 1,
131 .ops = &isl_fixed_ops,
132 .type = REGULATOR_VOLTAGE,
133 .owner = THIS_MODULE,
134 }, {
135 .name = "LDO2",
136 .id = 2,
137 .n_voltages = 1,
138 .ops = &isl_fixed_ops,
139 .type = REGULATOR_VOLTAGE,
140 .owner = THIS_MODULE,
141 },
142};
143
144static int __devinit isl6271a_probe(struct i2c_client *i2c,
145 const struct i2c_device_id *id)
146{
147 struct regulator_init_data *init_data = i2c->dev.platform_data;
148 struct isl_pmic *pmic;
149 int err, i;
150
151 if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
152 return -EIO;
153
154 if (!init_data) {
155 dev_err(&i2c->dev, "no platform data supplied\n");
156 return -EIO;
157 }
158
159 pmic = kzalloc(sizeof(struct isl_pmic), GFP_KERNEL);
160 if (!pmic)
161 return -ENOMEM;
162
163 pmic->client = i2c;
164
165 mutex_init(&pmic->mtx);
166
167 for (i = 0; i < 3; i++) {
Axel Linb9e5d112010-09-01 13:09:41 +0800168 pmic->rdev[i] = regulator_register(&isl_rd[i], &i2c->dev,
Marek Vasut51bd6942010-06-13 17:25:51 +0200169 init_data, pmic);
170 if (IS_ERR(pmic->rdev[i])) {
171 dev_err(&i2c->dev, "failed to register %s\n", id->name);
172 err = PTR_ERR(pmic->rdev);
173 goto error;
174 }
175 }
176
177 i2c_set_clientdata(i2c, pmic);
178
179 return 0;
180
181error:
182 while (--i >= 0)
183 regulator_unregister(pmic->rdev[i]);
184
185 kfree(pmic);
186 return err;
187}
188
189static int __devexit isl6271a_remove(struct i2c_client *i2c)
190{
191 struct isl_pmic *pmic = i2c_get_clientdata(i2c);
192 int i;
193
Marek Vasut51bd6942010-06-13 17:25:51 +0200194 for (i = 0; i < 3; i++)
195 regulator_unregister(pmic->rdev[i]);
196
197 kfree(pmic);
198
199 return 0;
200}
201
202static const struct i2c_device_id isl6271a_id[] = {
203 {.name = "isl6271a", 0 },
204 { },
205};
206
207MODULE_DEVICE_TABLE(i2c, isl6271a_id);
208
209static struct i2c_driver isl6271a_i2c_driver = {
210 .driver = {
211 .name = "isl6271a",
212 .owner = THIS_MODULE,
213 },
214 .probe = isl6271a_probe,
215 .remove = __devexit_p(isl6271a_remove),
216 .id_table = isl6271a_id,
217};
218
219static int __init isl6271a_init(void)
220{
221 return i2c_add_driver(&isl6271a_i2c_driver);
222}
223
224static void __exit isl6271a_cleanup(void)
225{
226 i2c_del_driver(&isl6271a_i2c_driver);
227}
228
229subsys_initcall(isl6271a_init);
230module_exit(isl6271a_cleanup);
231
232MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
233MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
234MODULE_LICENSE("GPL v2");