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
83int mc13xxx_regulator_list_voltage(struct regulator_dev *rdev,
84						unsigned selector)
85{
86	int id = rdev_get_id(rdev);
87	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
88	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
89
90	if (selector >= mc13xxx_regulators[id].desc.n_voltages)
91		return -EINVAL;
92
93	return mc13xxx_regulators[id].voltages[selector];
94}
95EXPORT_SYMBOL_GPL(mc13xxx_regulator_list_voltage);
96
97int mc13xxx_get_best_voltage_index(struct regulator_dev *rdev,
98						int min_uV, int max_uV)
99{
100	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
101	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
102	int reg_id = rdev_get_id(rdev);
103	int i;
104	int bestmatch;
105	int bestindex;
106
107	/*
108	 * Locate the minimum voltage fitting the criteria on
109	 * this regulator. The switchable voltages are not
110	 * in strict falling order so we need to check them
111	 * all for the best match.
112	 */
113	bestmatch = INT_MAX;
114	bestindex = -1;
115	for (i = 0; i < mc13xxx_regulators[reg_id].desc.n_voltages; i++) {
116		if (mc13xxx_regulators[reg_id].voltages[i] >= min_uV &&
117		    mc13xxx_regulators[reg_id].voltages[i] < bestmatch) {
118			bestmatch = mc13xxx_regulators[reg_id].voltages[i];
119			bestindex = i;
120		}
121	}
122
123	if (bestindex < 0 || bestmatch > max_uV) {
124		dev_warn(&rdev->dev, "no possible value for %d<=x<=%d uV\n",
125				min_uV, max_uV);
126		return -EINVAL;
127	}
128	return bestindex;
129}
130EXPORT_SYMBOL_GPL(mc13xxx_get_best_voltage_index);
131
132static int mc13xxx_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
133		int max_uV, unsigned *selector)
134{
135	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
136	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
137	int value, id = rdev_get_id(rdev);
138	int ret;
139
140	dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
141		__func__, id, min_uV, max_uV);
142
143	/* Find the best index */
144	value = mc13xxx_get_best_voltage_index(rdev, min_uV, max_uV);
145	dev_dbg(rdev_get_dev(rdev), "%s best value: %d\n", __func__, value);
146	if (value < 0)
147		return value;
148
149	mc13xxx_lock(priv->mc13xxx);
150	ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
151			mc13xxx_regulators[id].vsel_mask,
152			value << mc13xxx_regulators[id].vsel_shift);
153	mc13xxx_unlock(priv->mc13xxx);
154
155	return ret;
156}
157
158static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)
159{
160	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
161	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
162	int ret, id = rdev_get_id(rdev);
163	unsigned int val;
164
165	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
166
167	mc13xxx_lock(priv->mc13xxx);
168	ret = mc13xxx_reg_read(priv->mc13xxx,
169				mc13xxx_regulators[id].vsel_reg, &val);
170	mc13xxx_unlock(priv->mc13xxx);
171
172	if (ret)
173		return ret;
174
175	val = (val & mc13xxx_regulators[id].vsel_mask)
176		>> mc13xxx_regulators[id].vsel_shift;
177
178	dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);
179
180	BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages);
181
182	return mc13xxx_regulators[id].voltages[val];
183}
184
185struct regulator_ops mc13xxx_regulator_ops = {
186	.enable = mc13xxx_regulator_enable,
187	.disable = mc13xxx_regulator_disable,
188	.is_enabled = mc13xxx_regulator_is_enabled,
189	.list_voltage = mc13xxx_regulator_list_voltage,
190	.set_voltage = mc13xxx_regulator_set_voltage,
191	.get_voltage = mc13xxx_regulator_get_voltage,
192};
193EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);
194
195int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
196	       int max_uV, unsigned *selector)
197{
198	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
199	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
200	int id = rdev_get_id(rdev);
201
202	dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
203		__func__, id, min_uV, max_uV);
204
205	if (min_uV >= mc13xxx_regulators[id].voltages[0] &&
206	    max_uV <= mc13xxx_regulators[id].voltages[0])
207		return 0;
208	else
209		return -EINVAL;
210}
211EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);
212
213int mc13xxx_fixed_regulator_get_voltage(struct regulator_dev *rdev)
214{
215	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
216	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
217	int id = rdev_get_id(rdev);
218
219	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
220
221	return mc13xxx_regulators[id].voltages[0];
222}
223EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_get_voltage);
224
225struct regulator_ops mc13xxx_fixed_regulator_ops = {
226	.enable = mc13xxx_regulator_enable,
227	.disable = mc13xxx_regulator_disable,
228	.is_enabled = mc13xxx_regulator_is_enabled,
229	.list_voltage = mc13xxx_regulator_list_voltage,
230	.set_voltage = mc13xxx_fixed_regulator_set_voltage,
231	.get_voltage = mc13xxx_fixed_regulator_get_voltage,
232};
233EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
234
235int mc13xxx_sw_regulator_is_enabled(struct regulator_dev *rdev)
236{
237	return 1;
238}
239EXPORT_SYMBOL_GPL(mc13xxx_sw_regulator_is_enabled);
240
241#ifdef CONFIG_OF
242int __devinit mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
243{
244	struct device_node *parent, *child;
245	int num = 0;
246
247	of_node_get(pdev->dev.parent->of_node);
248	parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
249	if (!parent)
250		return -ENODEV;
251
252	for_each_child_of_node(parent, child)
253		num++;
254
255	return num;
256}
257EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);
258
259struct mc13xxx_regulator_init_data * __devinit mc13xxx_parse_regulators_dt(
260	struct platform_device *pdev, struct mc13xxx_regulator *regulators,
261	int num_regulators)
262{
263	struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
264	struct mc13xxx_regulator_init_data *data, *p;
265	struct device_node *parent, *child;
266	int i;
267
268	of_node_get(pdev->dev.parent->of_node);
269	parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
270	if (!parent)
271		return NULL;
272
273	data = devm_kzalloc(&pdev->dev, sizeof(*data) * priv->num_regulators,
274			    GFP_KERNEL);
275	if (!data)
276		return NULL;
277	p = data;
278
279	for_each_child_of_node(parent, child) {
280		for (i = 0; i < num_regulators; i++) {
281			if (!of_node_cmp(child->name,
282					 regulators[i].desc.name)) {
283				p->id = i;
284				p->init_data = of_get_regulator_init_data(
285							&pdev->dev, child);
286				p->node = child;
287				p++;
288				break;
289			}
290		}
291	}
292
293	return data;
294}
295EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
296#endif
297
298MODULE_LICENSE("GPL v2");
299MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
300MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
301MODULE_ALIAS("mc13xxx-regulator-core");
302