Root/drivers/regulator/mc13xxx-regulator-core.c

1/*
2 * Regulator Driver for Freescale MC13xxx PMIC
3 *
4 * Copyright 2010 Yong Shen <yong.shen@linaro.org>
5 *
6 * Based on mc13783 regulator driver :
7 * Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
8 * Copyright 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 * Regs infos taken from mc13xxx drivers from freescale and mc13xxx.pdf file
15 * from freescale
16 */
17
18#include <linux/mfd/mc13xxx.h>
19#include <linux/regulator/machine.h>
20#include <linux/regulator/driver.h>
21#include <linux/regulator/of_regulator.h>
22#include <linux/platform_device.h>
23#include <linux/kernel.h>
24#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/err.h>
27#include <linux/module.h>
28#include <linux/of.h>
29#include "mc13xxx.h"
30
31static int mc13xxx_regulator_enable(struct regulator_dev *rdev)
32{
33    struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
34    struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
35    int id = rdev_get_id(rdev);
36    int ret;
37
38    dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
39
40    mc13xxx_lock(priv->mc13xxx);
41    ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
42            mc13xxx_regulators[id].enable_bit,
43            mc13xxx_regulators[id].enable_bit);
44    mc13xxx_unlock(priv->mc13xxx);
45
46    return ret;
47}
48
49static int mc13xxx_regulator_disable(struct regulator_dev *rdev)
50{
51    struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
52    struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
53    int id = rdev_get_id(rdev);
54    int ret;
55
56    dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
57
58    mc13xxx_lock(priv->mc13xxx);
59    ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
60            mc13xxx_regulators[id].enable_bit, 0);
61    mc13xxx_unlock(priv->mc13xxx);
62
63    return ret;
64}
65
66static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev)
67{
68    struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
69    struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
70    int ret, id = rdev_get_id(rdev);
71    unsigned int val;
72
73    mc13xxx_lock(priv->mc13xxx);
74    ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val);
75    mc13xxx_unlock(priv->mc13xxx);
76
77    if (ret)
78        return ret;
79
80    return (val & mc13xxx_regulators[id].enable_bit) != 0;
81}
82
83static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev,
84                         unsigned selector)
85{
86    struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
87    struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
88    int id = rdev_get_id(rdev);
89    int ret;
90
91    mc13xxx_lock(priv->mc13xxx);
92    ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
93            mc13xxx_regulators[id].vsel_mask,
94            selector << mc13xxx_regulators[id].vsel_shift);
95    mc13xxx_unlock(priv->mc13xxx);
96
97    return ret;
98}
99
100static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)
101{
102    struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
103    struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
104    int ret, id = rdev_get_id(rdev);
105    unsigned int val;
106
107    dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
108
109    mc13xxx_lock(priv->mc13xxx);
110    ret = mc13xxx_reg_read(priv->mc13xxx,
111                mc13xxx_regulators[id].vsel_reg, &val);
112    mc13xxx_unlock(priv->mc13xxx);
113
114    if (ret)
115        return ret;
116
117    val = (val & mc13xxx_regulators[id].vsel_mask)
118        >> mc13xxx_regulators[id].vsel_shift;
119
120    dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);
121
122    BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages);
123
124    return rdev->desc->volt_table[val];
125}
126
127struct regulator_ops mc13xxx_regulator_ops = {
128    .enable = mc13xxx_regulator_enable,
129    .disable = mc13xxx_regulator_disable,
130    .is_enabled = mc13xxx_regulator_is_enabled,
131    .list_voltage = regulator_list_voltage_table,
132    .set_voltage_sel = mc13xxx_regulator_set_voltage_sel,
133    .get_voltage = mc13xxx_regulator_get_voltage,
134};
135EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);
136
137int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
138           int max_uV, unsigned *selector)
139{
140    int id = rdev_get_id(rdev);
141
142    dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
143        __func__, id, min_uV, max_uV);
144
145    if (min_uV <= rdev->desc->volt_table[0] &&
146        rdev->desc->volt_table[0] <= max_uV)
147        return 0;
148    else
149        return -EINVAL;
150}
151EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);
152
153int mc13xxx_fixed_regulator_get_voltage(struct regulator_dev *rdev)
154{
155    int id = rdev_get_id(rdev);
156
157    dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
158
159    return rdev->desc->volt_table[0];
160}
161EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_get_voltage);
162
163struct regulator_ops mc13xxx_fixed_regulator_ops = {
164    .enable = mc13xxx_regulator_enable,
165    .disable = mc13xxx_regulator_disable,
166    .is_enabled = mc13xxx_regulator_is_enabled,
167    .list_voltage = regulator_list_voltage_table,
168    .set_voltage = mc13xxx_fixed_regulator_set_voltage,
169    .get_voltage = mc13xxx_fixed_regulator_get_voltage,
170};
171EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
172
173#ifdef CONFIG_OF
174int __devinit mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
175{
176    struct device_node *parent, *child;
177    int num = 0;
178
179    of_node_get(pdev->dev.parent->of_node);
180    parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
181    if (!parent)
182        return -ENODEV;
183
184    for_each_child_of_node(parent, child)
185        num++;
186
187    return num;
188}
189EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);
190
191struct mc13xxx_regulator_init_data * __devinit mc13xxx_parse_regulators_dt(
192    struct platform_device *pdev, struct mc13xxx_regulator *regulators,
193    int num_regulators)
194{
195    struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
196    struct mc13xxx_regulator_init_data *data, *p;
197    struct device_node *parent, *child;
198    int i;
199
200    of_node_get(pdev->dev.parent->of_node);
201    parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
202    if (!parent)
203        return NULL;
204
205    data = devm_kzalloc(&pdev->dev, sizeof(*data) * priv->num_regulators,
206                GFP_KERNEL);
207    if (!data)
208        return NULL;
209    p = data;
210
211    for_each_child_of_node(parent, child) {
212        for (i = 0; i < num_regulators; i++) {
213            if (!of_node_cmp(child->name,
214                     regulators[i].desc.name)) {
215                p->id = i;
216                p->init_data = of_get_regulator_init_data(
217                            &pdev->dev, child);
218                p->node = child;
219                p++;
220                break;
221            }
222        }
223    }
224
225    return data;
226}
227EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
228#endif
229
230MODULE_LICENSE("GPL v2");
231MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
232MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
233MODULE_ALIAS("mc13xxx-regulator-core");
234

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