blob: 6f5ecbe1132e7da4f02496672578ef2301285767 [file] [log] [blame]
Steve Twiss16f10912013-08-06 15:30:48 +01001/*
2 * da9210-regulator.c - Regulator device driver for DA9210
3 * Copyright (C) 2013 Dialog Semiconductor Ltd.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 */
20
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>
Guennadi Liakhovetski937433c2013-09-12 14:28:35 +020028#include <linux/regulator/of_regulator.h>
Steve Twiss16f10912013-08-06 15:30:48 +010029#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/* Default limits measured in millivolts and milliamps */
59#define DA9210_MIN_MV 300
60#define DA9210_MAX_MV 1570
61#define DA9210_STEP_MV 10
62
63/* Current limits for buck (uA) indices corresponds with register values */
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 /* search for closest to maximum */
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 /* select one of 16 values: 0000 (1600mA) to 1111 (4600mA) */
118 sel = (data & DA9210_BUCK_ILIM_MASK) >> DA9210_BUCK_ILIM_SHIFT;
119
120 return da9210_buck_limits[sel];
121}
122
123/*
124 * I2C driver interface functions
125 */
126static int da9210_i2c_probe(struct i2c_client *i2c,
127 const struct i2c_device_id *id)
128{
129 struct da9210 *chip;
Guennadi Liakhovetski937433c2013-09-12 14:28:35 +0200130 struct device *dev = &i2c->dev;
131 struct da9210_pdata *pdata = dev_get_platdata(dev);
Steve Twiss16f10912013-08-06 15:30:48 +0100132 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 (NULL == chip) {
138 dev_err(&i2c->dev,
139 "Cannot kzalloc memory for regulator structure\n");
140 return -ENOMEM;
141 }
142
143 chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
144 if (IS_ERR(chip->regmap)) {
145 error = PTR_ERR(chip->regmap);
146 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
147 error);
148 return error;
149 }
150
151 config.dev = &i2c->dev;
Guennadi Liakhovetski937433c2013-09-12 14:28:35 +0200152 config.init_data = pdata ? &pdata->da9210_constraints :
153 of_get_regulator_init_data(dev, dev->of_node);
Steve Twiss16f10912013-08-06 15:30:48 +0100154 config.driver_data = chip;
155 config.regmap = chip->regmap;
Guennadi Liakhovetski937433c2013-09-12 14:28:35 +0200156 config.of_node = dev->of_node;
Steve Twiss16f10912013-08-06 15:30:48 +0100157
Jingoo Han11c0da72013-09-30 09:53:57 +0900158 rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
Steve Twiss16f10912013-08-06 15:30:48 +0100159 if (IS_ERR(rdev)) {
160 dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
161 return PTR_ERR(rdev);
162 }
163
164 chip->rdev = rdev;
165
166 i2c_set_clientdata(i2c, chip);
167
168 return 0;
169}
170
Steve Twiss16f10912013-08-06 15:30:48 +0100171static const struct i2c_device_id da9210_i2c_id[] = {
172 {"da9210", 0},
173 {},
174};
175
176MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
177
178static struct i2c_driver da9210_regulator_driver = {
179 .driver = {
180 .name = "da9210",
181 .owner = THIS_MODULE,
182 },
183 .probe = da9210_i2c_probe,
Steve Twiss16f10912013-08-06 15:30:48 +0100184 .id_table = da9210_i2c_id,
185};
186
187module_i2c_driver(da9210_regulator_driver);
188
189MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
190MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
191MODULE_LICENSE("GPL v2");