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
37	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
38
39	return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
40			       mc13xxx_regulators[id].enable_bit,
41			       mc13xxx_regulators[id].enable_bit);
42}
43
44static int mc13xxx_regulator_disable(struct regulator_dev *rdev)
45{
46	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
47	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
48	int id = rdev_get_id(rdev);
49
50	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
51
52	return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
53			       mc13xxx_regulators[id].enable_bit, 0);
54}
55
56static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev)
57{
58	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
59	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
60	int ret, id = rdev_get_id(rdev);
61	unsigned int val;
62
63	ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val);
64	if (ret)
65		return ret;
66
67	return (val & mc13xxx_regulators[id].enable_bit) != 0;
68}
69
70static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev,
71					     unsigned selector)
72{
73	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
74	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
75	int id = rdev_get_id(rdev);
76
77	return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
78			       mc13xxx_regulators[id].vsel_mask,
79			       selector << mc13xxx_regulators[id].vsel_shift);
80}
81
82static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)
83{
84	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
85	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
86	int ret, id = rdev_get_id(rdev);
87	unsigned int val;
88
89	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
90
91	ret = mc13xxx_reg_read(priv->mc13xxx,
92				mc13xxx_regulators[id].vsel_reg, &val);
93	if (ret)
94		return ret;
95
96	val = (val & mc13xxx_regulators[id].vsel_mask)
97		>> mc13xxx_regulators[id].vsel_shift;
98
99	dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);
100
101	BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages);
102
103	return rdev->desc->volt_table[val];
104}
105
106struct regulator_ops mc13xxx_regulator_ops = {
107	.enable = mc13xxx_regulator_enable,
108	.disable = mc13xxx_regulator_disable,
109	.is_enabled = mc13xxx_regulator_is_enabled,
110	.list_voltage = regulator_list_voltage_table,
111	.set_voltage_sel = mc13xxx_regulator_set_voltage_sel,
112	.get_voltage = mc13xxx_regulator_get_voltage,
113};
114EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);
115
116int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
117	       int max_uV, unsigned *selector)
118{
119	int id = rdev_get_id(rdev);
120
121	dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
122		__func__, id, min_uV, max_uV);
123
124	if (min_uV <= rdev->desc->volt_table[0] &&
125	    rdev->desc->volt_table[0] <= max_uV) {
126		*selector = 0;
127		return 0;
128	} else {
129		return -EINVAL;
130	}
131}
132EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);
133
134struct regulator_ops mc13xxx_fixed_regulator_ops = {
135	.enable = mc13xxx_regulator_enable,
136	.disable = mc13xxx_regulator_disable,
137	.is_enabled = mc13xxx_regulator_is_enabled,
138	.list_voltage = regulator_list_voltage_table,
139	.set_voltage = mc13xxx_fixed_regulator_set_voltage,
140};
141EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
142
143#ifdef CONFIG_OF
144int mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
145{
146	struct device_node *parent;
147	int num;
148
149	if (!pdev->dev.parent->of_node)
150		return -ENODEV;
151
152	parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
153	if (!parent)
154		return -ENODEV;
155
156	num = of_get_child_count(parent);
157	of_node_put(parent);
158	return num;
159}
160EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);
161
162struct mc13xxx_regulator_init_data *mc13xxx_parse_regulators_dt(
163	struct platform_device *pdev, struct mc13xxx_regulator *regulators,
164	int num_regulators)
165{
166	struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
167	struct mc13xxx_regulator_init_data *data, *p;
168	struct device_node *parent, *child;
169	int i, parsed = 0;
170
171	if (!pdev->dev.parent->of_node)
172		return NULL;
173
174	parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
175	if (!parent)
176		return NULL;
177
178	data = devm_kzalloc(&pdev->dev, sizeof(*data) * priv->num_regulators,
179			    GFP_KERNEL);
180	if (!data) {
181		of_node_put(parent);
182		return NULL;
183	}
184
185	p = data;
186
187	for_each_child_of_node(parent, child) {
188		int found = 0;
189
190		for (i = 0; i < num_regulators; i++) {
191			if (!regulators[i].desc.name)
192				continue;
193			if (!of_node_cmp(child->name,
194					 regulators[i].desc.name)) {
195				p->id = i;
196				p->init_data = of_get_regulator_init_data(
197							&pdev->dev, child);
198				p->node = child;
199				p++;
200
201				parsed++;
202				found = 1;
203				break;
204			}
205		}
206
207		if (!found)
208			dev_warn(&pdev->dev,
209				 "Unknown regulator: %s\n", child->name);
210	}
211	of_node_put(parent);
212
213	priv->num_regulators = parsed;
214
215	return data;
216}
217EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
218#endif
219
220MODULE_LICENSE("GPL v2");
221MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
222MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
223MODULE_ALIAS("mc13xxx-regulator-core");
224