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");
221