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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
Mark Brown3a93f2a2010-11-10 14:38:29 +000061static int isl6271a_set_voltage(struct regulator_dev *dev,
62 int minuV, int maxuV,
63 unsigned *selector)
Marek Vasut51bd6942010-06-13 17:25:51 +020064{
65 struct isl_pmic *pmic = rdev_get_drvdata(dev);
66 int vsel, err, data;
67
68 if (minuV < ISL6271A_VOLTAGE_MIN || minuV > ISL6271A_VOLTAGE_MAX)
69 return -EINVAL;
70 if (maxuV < ISL6271A_VOLTAGE_MIN || maxuV > ISL6271A_VOLTAGE_MAX)
71 return -EINVAL;
72
73 /* Align to 50000 mV */
74 vsel = minuV - (minuV % ISL6271A_VOLTAGE_STEP);
75
76 /* If the result fell out of [minuV,maxuV] range, put it back */
77 if (vsel < minuV)
78 vsel += ISL6271A_VOLTAGE_STEP;
79
80 /* Convert the microvolts to data for the chip */
81 data = (vsel - ISL6271A_VOLTAGE_MIN) / ISL6271A_VOLTAGE_STEP;
82
Mark Brown3a93f2a2010-11-10 14:38:29 +000083 *selector = data;
84
Marek Vasut51bd6942010-06-13 17:25:51 +020085 mutex_lock(&pmic->mtx);
86
87 err = i2c_smbus_write_byte(pmic->client, data);
88 if (err < 0)
89 dev_err(&pmic->client->dev, "Error setting voltage\n");
90
91 mutex_unlock(&pmic->mtx);
92 return err;
93}
94
95static int isl6271a_list_voltage(struct regulator_dev *dev, unsigned selector)
96{
97 return ISL6271A_VOLTAGE_MIN + (ISL6271A_VOLTAGE_STEP * selector);
98}
99
100static struct regulator_ops isl_core_ops = {
101 .get_voltage = isl6271a_get_voltage,
102 .set_voltage = isl6271a_set_voltage,
103 .list_voltage = isl6271a_list_voltage,
104};
105
106static int isl6271a_get_fixed_voltage(struct regulator_dev *dev)
107{
108 int id = rdev_get_id(dev);
109 return (id == 1) ? 1100000 : 1300000;
110}
111
112static int isl6271a_list_fixed_voltage(struct regulator_dev *dev, unsigned selector)
113{
114 int id = rdev_get_id(dev);
115 return (id == 1) ? 1100000 : 1300000;
116}
117
118static struct regulator_ops isl_fixed_ops = {
119 .get_voltage = isl6271a_get_fixed_voltage,
120 .list_voltage = isl6271a_list_fixed_voltage,
121};
122
123static struct regulator_desc isl_rd[] = {
124 {
125 .name = "Core Buck",
126 .id = 0,
127 .n_voltages = 16,
128 .ops = &isl_core_ops,
129 .type = REGULATOR_VOLTAGE,
130 .owner = THIS_MODULE,
131 }, {
132 .name = "LDO1",
133 .id = 1,
134 .n_voltages = 1,
135 .ops = &isl_fixed_ops,
136 .type = REGULATOR_VOLTAGE,
137 .owner = THIS_MODULE,
138 }, {
139 .name = "LDO2",
140 .id = 2,
141 .n_voltages = 1,
142 .ops = &isl_fixed_ops,
143 .type = REGULATOR_VOLTAGE,
144 .owner = THIS_MODULE,
145 },
146};
147
148static int __devinit isl6271a_probe(struct i2c_client *i2c,
149 const struct i2c_device_id *id)
150{
151 struct regulator_init_data *init_data = i2c->dev.platform_data;
152 struct isl_pmic *pmic;
153 int err, i;
154
155 if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
156 return -EIO;
157
158 if (!init_data) {
159 dev_err(&i2c->dev, "no platform data supplied\n");
160 return -EIO;
161 }
162
163 pmic = kzalloc(sizeof(struct isl_pmic), GFP_KERNEL);
164 if (!pmic)
165 return -ENOMEM;
166
167 pmic->client = i2c;
168
169 mutex_init(&pmic->mtx);
170
171 for (i = 0; i < 3; i++) {
Axel Linb9e5d112010-09-01 13:09:41 +0800172 pmic->rdev[i] = regulator_register(&isl_rd[i], &i2c->dev,
Marek Vasut51bd6942010-06-13 17:25:51 +0200173 init_data, pmic);
174 if (IS_ERR(pmic->rdev[i])) {
175 dev_err(&i2c->dev, "failed to register %s\n", id->name);
roel kluinfa63bd42010-12-31 16:26:47 +0100176 err = PTR_ERR(pmic->rdev[i]);
Marek Vasut51bd6942010-06-13 17:25:51 +0200177 goto error;
178 }
179 }
180
181 i2c_set_clientdata(i2c, pmic);
182
183 return 0;
184
185error:
186 while (--i >= 0)
187 regulator_unregister(pmic->rdev[i]);
188
189 kfree(pmic);
190 return err;
191}
192
193static int __devexit isl6271a_remove(struct i2c_client *i2c)
194{
195 struct isl_pmic *pmic = i2c_get_clientdata(i2c);
196 int i;
197
Marek Vasut51bd6942010-06-13 17:25:51 +0200198 for (i = 0; i < 3; i++)
199 regulator_unregister(pmic->rdev[i]);
200
201 kfree(pmic);
202
203 return 0;
204}
205
206static const struct i2c_device_id isl6271a_id[] = {
207 {.name = "isl6271a", 0 },
208 { },
209};
210
211MODULE_DEVICE_TABLE(i2c, isl6271a_id);
212
213static struct i2c_driver isl6271a_i2c_driver = {
214 .driver = {
215 .name = "isl6271a",
216 .owner = THIS_MODULE,
217 },
218 .probe = isl6271a_probe,
219 .remove = __devexit_p(isl6271a_remove),
220 .id_table = isl6271a_id,
221};
222
223static int __init isl6271a_init(void)
224{
225 return i2c_add_driver(&isl6271a_i2c_driver);
226}
227
228static void __exit isl6271a_cleanup(void)
229{
230 i2c_del_driver(&isl6271a_i2c_driver);
231}
232
233subsys_initcall(isl6271a_init);
234module_exit(isl6271a_cleanup);
235
236MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
237MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver");
238MODULE_LICENSE("GPL v2");