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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/platform_device.h>
22#include <linux/kernel.h>
23#include <linux/slab.h>
24#include <linux/init.h>
25#include <linux/err.h>
26#include "mc13xxx.h"
27
28static int mc13xxx_regulator_enable(struct regulator_dev *rdev)
29{
30 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
31 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
32 int id = rdev_get_id(rdev);
33 int ret;
34
35 dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
36
37 mc13xxx_lock(priv->mc13xxx);
38 ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
39 mc13xxx_regulators[id].enable_bit,
40 mc13xxx_regulators[id].enable_bit);
41 mc13xxx_unlock(priv->mc13xxx);
42
43 return ret;
44}
45
46static int mc13xxx_regulator_disable(struct regulator_dev *rdev)
47{
48 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
49 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
50 int id = rdev_get_id(rdev);
51 int ret;
52
53 dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
54
55 mc13xxx_lock(priv->mc13xxx);
56 ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
57 mc13xxx_regulators[id].enable_bit, 0);
58 mc13xxx_unlock(priv->mc13xxx);
59
60 return ret;
61}
62
63static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev)
64{
65 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
66 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
67 int ret, id = rdev_get_id(rdev);
68 unsigned int val;
69
70 mc13xxx_lock(priv->mc13xxx);
71 ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val);
72 mc13xxx_unlock(priv->mc13xxx);
73
74 if (ret)
75 return ret;
76
77 return (val & mc13xxx_regulators[id].enable_bit) != 0;
78}
79
80int mc13xxx_regulator_list_voltage(struct regulator_dev *rdev,
81 unsigned selector)
82{
83 int id = rdev_get_id(rdev);
84 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
85 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
86
87 if (selector >= mc13xxx_regulators[id].desc.n_voltages)
88 return -EINVAL;
89
90 return mc13xxx_regulators[id].voltages[selector];
91}
92EXPORT_SYMBOL_GPL(mc13xxx_regulator_list_voltage);
93
94int mc13xxx_get_best_voltage_index(struct regulator_dev *rdev,
95 int min_uV, int max_uV)
96{
97 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
98 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
99 int reg_id = rdev_get_id(rdev);
100 int i;
101 int bestmatch;
102 int bestindex;
103
104 /*
105 * Locate the minimum voltage fitting the criteria on
106 * this regulator. The switchable voltages are not
107 * in strict falling order so we need to check them
108 * all for the best match.
109 */
110 bestmatch = INT_MAX;
111 bestindex = -1;
112 for (i = 0; i < mc13xxx_regulators[reg_id].desc.n_voltages; i++) {
113 if (mc13xxx_regulators[reg_id].voltages[i] >= min_uV &&
114 mc13xxx_regulators[reg_id].voltages[i] < bestmatch) {
115 bestmatch = mc13xxx_regulators[reg_id].voltages[i];
116 bestindex = i;
117 }
118 }
119
120 if (bestindex < 0 || bestmatch > max_uV) {
121 dev_warn(&rdev->dev, "no possible value for %d<=x<=%d uV\n",
122 min_uV, max_uV);
123 return -EINVAL;
124 }
125 return bestindex;
126}
127EXPORT_SYMBOL_GPL(mc13xxx_get_best_voltage_index);
128
129static int mc13xxx_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
130 int max_uV, unsigned *selector)
131{
132 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
133 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
134 int value, id = rdev_get_id(rdev);
135 int ret;
136
137 dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
138 __func__, id, min_uV, max_uV);
139
140 /* Find the best index */
141 value = mc13xxx_get_best_voltage_index(rdev, min_uV, max_uV);
142 dev_dbg(rdev_get_dev(rdev), "%s best value: %d\n", __func__, value);
143 if (value < 0)
144 return value;
145
146 mc13xxx_lock(priv->mc13xxx);
147 ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
148 mc13xxx_regulators[id].vsel_mask,
149 value << mc13xxx_regulators[id].vsel_shift);
150 mc13xxx_unlock(priv->mc13xxx);
151
152 return ret;
153}
154
155static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)
156{
157 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
158 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
159 int ret, id = rdev_get_id(rdev);
160 unsigned int val;
161
162 dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
163
164 mc13xxx_lock(priv->mc13xxx);
165 ret = mc13xxx_reg_read(priv->mc13xxx,
166 mc13xxx_regulators[id].vsel_reg, &val);
167 mc13xxx_unlock(priv->mc13xxx);
168
169 if (ret)
170 return ret;
171
172 val = (val & mc13xxx_regulators[id].vsel_mask)
173 >> mc13xxx_regulators[id].vsel_shift;
174
175 dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);
176
177 BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages);
178
179 return mc13xxx_regulators[id].voltages[val];
180}
181
182struct regulator_ops mc13xxx_regulator_ops = {
183 .enable = mc13xxx_regulator_enable,
184 .disable = mc13xxx_regulator_disable,
185 .is_enabled = mc13xxx_regulator_is_enabled,
186 .list_voltage = mc13xxx_regulator_list_voltage,
187 .set_voltage = mc13xxx_regulator_set_voltage,
188 .get_voltage = mc13xxx_regulator_get_voltage,
189};
190EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);
191
192int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
193 int max_uV, unsigned *selector)
194{
195 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
196 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
197 int id = rdev_get_id(rdev);
198
199 dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
200 __func__, id, min_uV, max_uV);
201
202 if (min_uV >= mc13xxx_regulators[id].voltages[0] &&
203 max_uV <= mc13xxx_regulators[id].voltages[0])
204 return 0;
205 else
206 return -EINVAL;
207}
208EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);
209
210int mc13xxx_fixed_regulator_get_voltage(struct regulator_dev *rdev)
211{
212 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
213 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
214 int id = rdev_get_id(rdev);
215
216 dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
217
218 return mc13xxx_regulators[id].voltages[0];
219}
220EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_get_voltage);
221
222struct regulator_ops mc13xxx_fixed_regulator_ops = {
223 .enable = mc13xxx_regulator_enable,
224 .disable = mc13xxx_regulator_disable,
225 .is_enabled = mc13xxx_regulator_is_enabled,
226 .list_voltage = mc13xxx_regulator_list_voltage,
227 .set_voltage = mc13xxx_fixed_regulator_set_voltage,
228 .get_voltage = mc13xxx_fixed_regulator_get_voltage,
229};
230EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
231
232int mc13xxx_sw_regulator_is_enabled(struct regulator_dev *rdev)
233{
234 return 1;
235}
236EXPORT_SYMBOL_GPL(mc13xxx_sw_regulator_is_enabled);
237
238MODULE_LICENSE("GPL v2");
239MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
240MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
241MODULE_ALIAS("mc13xxx-regulator-core");
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 *selector = 0;
148 return 0;
149 } else {
150 return -EINVAL;
151 }
152}
153EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);
154
155struct regulator_ops mc13xxx_fixed_regulator_ops = {
156 .enable = mc13xxx_regulator_enable,
157 .disable = mc13xxx_regulator_disable,
158 .is_enabled = mc13xxx_regulator_is_enabled,
159 .list_voltage = regulator_list_voltage_table,
160 .set_voltage = mc13xxx_fixed_regulator_set_voltage,
161};
162EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
163
164#ifdef CONFIG_OF
165int mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
166{
167 struct device_node *parent;
168 int num;
169
170 if (!pdev->dev.parent->of_node)
171 return -ENODEV;
172
173 parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
174 if (!parent)
175 return -ENODEV;
176
177 num = of_get_child_count(parent);
178 of_node_put(parent);
179 return num;
180}
181EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);
182
183struct mc13xxx_regulator_init_data *mc13xxx_parse_regulators_dt(
184 struct platform_device *pdev, struct mc13xxx_regulator *regulators,
185 int num_regulators)
186{
187 struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
188 struct mc13xxx_regulator_init_data *data, *p;
189 struct device_node *parent, *child;
190 int i, parsed = 0;
191
192 if (!pdev->dev.parent->of_node)
193 return NULL;
194
195 parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
196 if (!parent)
197 return NULL;
198
199 data = devm_kzalloc(&pdev->dev, sizeof(*data) * priv->num_regulators,
200 GFP_KERNEL);
201 if (!data) {
202 of_node_put(parent);
203 return NULL;
204 }
205
206 p = data;
207
208 for_each_child_of_node(parent, child) {
209 int found = 0;
210
211 for (i = 0; i < num_regulators; i++) {
212 if (!regulators[i].desc.name)
213 continue;
214 if (!of_node_cmp(child->name,
215 regulators[i].desc.name)) {
216 p->id = i;
217 p->init_data = of_get_regulator_init_data(
218 &pdev->dev, child);
219 p->node = child;
220 p++;
221
222 parsed++;
223 found = 1;
224 break;
225 }
226 }
227
228 if (!found)
229 dev_warn(&pdev->dev,
230 "Unknown regulator: %s\n", child->name);
231 }
232 of_node_put(parent);
233
234 priv->num_regulators = parsed;
235
236 return data;
237}
238EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
239#endif
240
241MODULE_LICENSE("GPL v2");
242MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
243MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
244MODULE_ALIAS("mc13xxx-regulator-core");