File: mc13xxx-regulator-core.c

package info (click to toggle)
linux 4.19.20-1
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 954,852 kB
  • sloc: ansic: 16,749,828; asm: 271,286; makefile: 38,257; sh: 32,808; perl: 27,671; python: 21,022; cpp: 5,063; yacc: 4,648; lex: 2,585; awk: 1,385; ruby: 25; sed: 5
file content (220 lines) | stat: -rw-r--r-- 6,195 bytes parent folder | download | duplicates (7)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
// SPDX-License-Identifier: GPL-2.0
//
// Regulator Driver for Freescale MC13xxx PMIC
//
// Copyright 2010 Yong Shen <yong.shen@linaro.org>
//
// Based on mc13783 regulator driver :
// Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
// Copyright 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
//
// Regs infos taken from mc13xxx drivers from freescale and mc13xxx.pdf file
// from freescale

#include <linux/mfd/mc13xxx.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include "mc13xxx.h"

static int mc13xxx_regulator_enable(struct regulator_dev *rdev)
{
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
	int id = rdev_get_id(rdev);

	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

	return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
			       mc13xxx_regulators[id].enable_bit,
			       mc13xxx_regulators[id].enable_bit);
}

static int mc13xxx_regulator_disable(struct regulator_dev *rdev)
{
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
	int id = rdev_get_id(rdev);

	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

	return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
			       mc13xxx_regulators[id].enable_bit, 0);
}

static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev)
{
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
	int ret, id = rdev_get_id(rdev);
	unsigned int val;

	ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val);
	if (ret)
		return ret;

	return (val & mc13xxx_regulators[id].enable_bit) != 0;
}

static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev,
					     unsigned selector)
{
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
	int id = rdev_get_id(rdev);

	return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
			       mc13xxx_regulators[id].vsel_mask,
			       selector << mc13xxx_regulators[id].vsel_shift);
}

static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)
{
	struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
	struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
	int ret, id = rdev_get_id(rdev);
	unsigned int val;

	dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

	ret = mc13xxx_reg_read(priv->mc13xxx,
				mc13xxx_regulators[id].vsel_reg, &val);
	if (ret)
		return ret;

	val = (val & mc13xxx_regulators[id].vsel_mask)
		>> mc13xxx_regulators[id].vsel_shift;

	dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);

	BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages);

	return rdev->desc->volt_table[val];
}

struct regulator_ops mc13xxx_regulator_ops = {
	.enable = mc13xxx_regulator_enable,
	.disable = mc13xxx_regulator_disable,
	.is_enabled = mc13xxx_regulator_is_enabled,
	.list_voltage = regulator_list_voltage_table,
	.set_voltage_sel = mc13xxx_regulator_set_voltage_sel,
	.get_voltage = mc13xxx_regulator_get_voltage,
};
EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);

int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
	       int max_uV, unsigned *selector)
{
	int id = rdev_get_id(rdev);

	dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
		__func__, id, min_uV, max_uV);

	if (min_uV <= rdev->desc->volt_table[0] &&
	    rdev->desc->volt_table[0] <= max_uV) {
		*selector = 0;
		return 0;
	} else {
		return -EINVAL;
	}
}
EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);

struct regulator_ops mc13xxx_fixed_regulator_ops = {
	.enable = mc13xxx_regulator_enable,
	.disable = mc13xxx_regulator_disable,
	.is_enabled = mc13xxx_regulator_is_enabled,
	.list_voltage = regulator_list_voltage_table,
	.set_voltage = mc13xxx_fixed_regulator_set_voltage,
};
EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);

#ifdef CONFIG_OF
int mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
{
	struct device_node *parent;
	int num;

	if (!pdev->dev.parent->of_node)
		return -ENODEV;

	parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
	if (!parent)
		return -ENODEV;

	num = of_get_child_count(parent);
	of_node_put(parent);
	return num;
}
EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);

struct mc13xxx_regulator_init_data *mc13xxx_parse_regulators_dt(
	struct platform_device *pdev, struct mc13xxx_regulator *regulators,
	int num_regulators)
{
	struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
	struct mc13xxx_regulator_init_data *data, *p;
	struct device_node *parent, *child;
	int i, parsed = 0;

	if (!pdev->dev.parent->of_node)
		return NULL;

	parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
	if (!parent)
		return NULL;

	data = devm_kcalloc(&pdev->dev, priv->num_regulators, sizeof(*data),
			    GFP_KERNEL);
	if (!data) {
		of_node_put(parent);
		return NULL;
	}

	p = data;

	for_each_child_of_node(parent, child) {
		int found = 0;

		for (i = 0; i < num_regulators; i++) {
			if (!regulators[i].desc.name)
				continue;
			if (!of_node_cmp(child->name,
					 regulators[i].desc.name)) {
				p->id = i;
				p->init_data = of_get_regulator_init_data(
							&pdev->dev, child,
							&regulators[i].desc);
				p->node = child;
				p++;

				parsed++;
				found = 1;
				break;
			}
		}

		if (!found)
			dev_warn(&pdev->dev,
				 "Unknown regulator: %s\n", child->name);
	}
	of_node_put(parent);

	priv->num_regulators = parsed;

	return data;
}
EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
#endif

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
MODULE_ALIAS("mc13xxx-regulator-core");