Merge tag 'v5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux...
[sfrench/cifs-2.6.git] / drivers / regulator / mc13xxx-regulator-core.c
1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Regulator Driver for Freescale MC13xxx PMIC
4 //
5 // Copyright 2010 Yong Shen <yong.shen@linaro.org>
6 //
7 // Based on mc13783 regulator driver :
8 // Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
9 // Copyright 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
10 //
11 // Regs infos taken from mc13xxx drivers from freescale and mc13xxx.pdf file
12 // from freescale
13
14 #include <linux/mfd/mc13xxx.h>
15 #include <linux/regulator/machine.h>
16 #include <linux/regulator/driver.h>
17 #include <linux/regulator/of_regulator.h>
18 #include <linux/platform_device.h>
19 #include <linux/kernel.h>
20 #include <linux/slab.h>
21 #include <linux/init.h>
22 #include <linux/err.h>
23 #include <linux/module.h>
24 #include <linux/of.h>
25 #include "mc13xxx.h"
26
27 static int mc13xxx_regulator_enable(struct regulator_dev *rdev)
28 {
29         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
30         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
31         int id = rdev_get_id(rdev);
32
33         dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
34
35         return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
36                                mc13xxx_regulators[id].enable_bit,
37                                mc13xxx_regulators[id].enable_bit);
38 }
39
40 static int mc13xxx_regulator_disable(struct regulator_dev *rdev)
41 {
42         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
43         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
44         int id = rdev_get_id(rdev);
45
46         dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
47
48         return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
49                                mc13xxx_regulators[id].enable_bit, 0);
50 }
51
52 static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev)
53 {
54         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
55         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
56         int ret, id = rdev_get_id(rdev);
57         unsigned int val;
58
59         ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val);
60         if (ret)
61                 return ret;
62
63         return (val & mc13xxx_regulators[id].enable_bit) != 0;
64 }
65
66 static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev,
67                                              unsigned selector)
68 {
69         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
70         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
71         int id = rdev_get_id(rdev);
72
73         return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
74                                mc13xxx_regulators[id].vsel_mask,
75                                selector << mc13xxx_regulators[id].vsel_shift);
76 }
77
78 static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)
79 {
80         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
81         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
82         int ret, id = rdev_get_id(rdev);
83         unsigned int val;
84
85         dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
86
87         ret = mc13xxx_reg_read(priv->mc13xxx,
88                                 mc13xxx_regulators[id].vsel_reg, &val);
89         if (ret)
90                 return ret;
91
92         val = (val & mc13xxx_regulators[id].vsel_mask)
93                 >> mc13xxx_regulators[id].vsel_shift;
94
95         dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);
96
97         BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages);
98
99         return rdev->desc->volt_table[val];
100 }
101
102 const struct regulator_ops mc13xxx_regulator_ops = {
103         .enable = mc13xxx_regulator_enable,
104         .disable = mc13xxx_regulator_disable,
105         .is_enabled = mc13xxx_regulator_is_enabled,
106         .list_voltage = regulator_list_voltage_table,
107         .set_voltage_sel = mc13xxx_regulator_set_voltage_sel,
108         .get_voltage = mc13xxx_regulator_get_voltage,
109 };
110 EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);
111
112 int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
113                int max_uV, unsigned *selector)
114 {
115         int id = rdev_get_id(rdev);
116
117         dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
118                 __func__, id, min_uV, max_uV);
119
120         if (min_uV <= rdev->desc->volt_table[0] &&
121             rdev->desc->volt_table[0] <= max_uV) {
122                 *selector = 0;
123                 return 0;
124         } else {
125                 return -EINVAL;
126         }
127 }
128 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);
129
130 const struct regulator_ops mc13xxx_fixed_regulator_ops = {
131         .enable = mc13xxx_regulator_enable,
132         .disable = mc13xxx_regulator_disable,
133         .is_enabled = mc13xxx_regulator_is_enabled,
134         .list_voltage = regulator_list_voltage_table,
135         .set_voltage = mc13xxx_fixed_regulator_set_voltage,
136 };
137 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
138
139 #ifdef CONFIG_OF
140 int mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
141 {
142         struct device_node *parent;
143         int num;
144
145         if (!pdev->dev.parent->of_node)
146                 return -ENODEV;
147
148         parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
149         if (!parent)
150                 return -ENODEV;
151
152         num = of_get_child_count(parent);
153         of_node_put(parent);
154         return num;
155 }
156 EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);
157
158 struct mc13xxx_regulator_init_data *mc13xxx_parse_regulators_dt(
159         struct platform_device *pdev, struct mc13xxx_regulator *regulators,
160         int num_regulators)
161 {
162         struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
163         struct mc13xxx_regulator_init_data *data, *p;
164         struct device_node *parent, *child;
165         int i, parsed = 0;
166
167         if (!pdev->dev.parent->of_node)
168                 return NULL;
169
170         parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
171         if (!parent)
172                 return NULL;
173
174         data = devm_kcalloc(&pdev->dev, priv->num_regulators, sizeof(*data),
175                             GFP_KERNEL);
176         if (!data) {
177                 of_node_put(parent);
178                 return NULL;
179         }
180
181         p = data;
182
183         for_each_child_of_node(parent, child) {
184                 int found = 0;
185
186                 for (i = 0; i < num_regulators; i++) {
187                         if (!regulators[i].desc.name)
188                                 continue;
189                         if (of_node_name_eq(child,
190                                          regulators[i].desc.name)) {
191                                 p->id = i;
192                                 p->init_data = of_get_regulator_init_data(
193                                                         &pdev->dev, child,
194                                                         &regulators[i].desc);
195                                 p->node = child;
196                                 p++;
197
198                                 parsed++;
199                                 found = 1;
200                                 break;
201                         }
202                 }
203
204                 if (!found)
205                         dev_warn(&pdev->dev,
206                                  "Unknown regulator: %pOFn\n", child);
207         }
208         of_node_put(parent);
209
210         priv->num_regulators = parsed;
211
212         return data;
213 }
214 EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
215 #endif
216
217 MODULE_LICENSE("GPL v2");
218 MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
219 MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
220 MODULE_ALIAS("mc13xxx-regulator-core");