1/*
2 * Regulator driver for Ricoh RN5T618 PMIC
3 *
4 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
9 *
10 * You should have received a copy of the GNU General Public License
11 * along with this program. If not, see <http://www.gnu.org/licenses/>.
12 */
13
14#include <linux/mfd/rn5t618.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/platform_device.h>
18#include <linux/regmap.h>
19#include <linux/regulator/driver.h>
20#include <linux/regulator/of_regulator.h>
21
22static struct regulator_ops rn5t618_reg_ops = {
23	.enable			= regulator_enable_regmap,
24	.disable		= regulator_disable_regmap,
25	.is_enabled		= regulator_is_enabled_regmap,
26	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
27	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
28	.list_voltage		= regulator_list_voltage_linear,
29};
30
31#define REG(rid, ereg, emask, vreg, vmask, min, max, step)		\
32	[RN5T618_##rid] = {						\
33		.name		= #rid,					\
34		.id		= RN5T618_##rid,			\
35		.type		= REGULATOR_VOLTAGE,			\
36		.owner		= THIS_MODULE,				\
37		.ops		= &rn5t618_reg_ops,			\
38		.n_voltages	= ((max) - (min)) / (step) + 1,		\
39		.min_uV		= (min),				\
40		.uV_step	= (step),				\
41		.enable_reg	= RN5T618_##ereg,			\
42		.enable_mask	= (emask),				\
43		.vsel_reg	= RN5T618_##vreg,			\
44		.vsel_mask	= (vmask),				\
45	}
46
47static struct regulator_desc rn5t618_regulators[] = {
48	/* DCDC */
49	REG(DCDC1, DC1CTL, BIT(0), DC1DAC, 0xff, 600000, 3500000, 12500),
50	REG(DCDC2, DC2CTL, BIT(0), DC2DAC, 0xff, 600000, 3500000, 12500),
51	REG(DCDC3, DC3CTL, BIT(0), DC3DAC, 0xff, 600000, 3500000, 12500),
52	/* LDO */
53	REG(LDO1, LDOEN1, BIT(0), LDO1DAC, 0x7f, 900000, 3500000, 25000),
54	REG(LDO2, LDOEN1, BIT(1), LDO2DAC, 0x7f, 900000, 3500000, 25000),
55	REG(LDO3, LDOEN1, BIT(2), LDO3DAC, 0x7f, 600000, 3500000, 25000),
56	REG(LDO4, LDOEN1, BIT(3), LDO4DAC, 0x7f, 900000, 3500000, 25000),
57	REG(LDO5, LDOEN1, BIT(4), LDO5DAC, 0x7f, 900000, 3500000, 25000),
58	/* LDO RTC */
59	REG(LDORTC1, LDOEN2, BIT(4), LDORTCDAC, 0x7f, 1700000, 3500000, 25000),
60	REG(LDORTC2, LDOEN2, BIT(5), LDORTC2DAC, 0x7f, 900000, 3500000, 25000),
61};
62
63static struct of_regulator_match rn5t618_matches[] = {
64	[RN5T618_DCDC1]		= { .name = "DCDC1" },
65	[RN5T618_DCDC2]		= { .name = "DCDC2" },
66	[RN5T618_DCDC3]		= { .name = "DCDC3" },
67	[RN5T618_LDO1]		= { .name = "LDO1" },
68	[RN5T618_LDO2]		= { .name = "LDO2" },
69	[RN5T618_LDO3]		= { .name = "LDO3" },
70	[RN5T618_LDO4]		= { .name = "LDO4" },
71	[RN5T618_LDO5]		= { .name = "LDO5" },
72	[RN5T618_LDORTC1]	= { .name = "LDORTC1" },
73	[RN5T618_LDORTC2]	= { .name = "LDORTC2" },
74};
75
76static int rn5t618_regulator_parse_dt(struct platform_device *pdev)
77{
78	struct device_node *np, *regulators;
79	int ret;
80
81	np = of_node_get(pdev->dev.parent->of_node);
82	if (!np)
83		return 0;
84
85	regulators = of_get_child_by_name(np, "regulators");
86	if (!regulators) {
87		dev_err(&pdev->dev, "regulators node not found\n");
88		return -EINVAL;
89	}
90
91	ret = of_regulator_match(&pdev->dev, regulators, rn5t618_matches,
92				 ARRAY_SIZE(rn5t618_matches));
93	of_node_put(regulators);
94	if (ret < 0) {
95		dev_err(&pdev->dev, "error parsing regulator init data: %d\n",
96			ret);
97	}
98
99	return 0;
100}
101
102static int rn5t618_regulator_probe(struct platform_device *pdev)
103{
104	struct rn5t618 *rn5t618 = dev_get_drvdata(pdev->dev.parent);
105	struct regulator_config config = { };
106	struct regulator_dev *rdev;
107	int ret, i;
108
109	ret = rn5t618_regulator_parse_dt(pdev);
110	if (ret)
111		return ret;
112
113	for (i = 0; i < RN5T618_REG_NUM; i++) {
114		config.dev = &pdev->dev;
115		config.init_data = rn5t618_matches[i].init_data;
116		config.of_node = rn5t618_matches[i].of_node;
117		config.regmap = rn5t618->regmap;
118
119		rdev = devm_regulator_register(&pdev->dev,
120					       &rn5t618_regulators[i],
121					       &config);
122		if (IS_ERR(rdev)) {
123			dev_err(&pdev->dev, "failed to register %s regulator\n",
124				rn5t618_regulators[i].name);
125			return PTR_ERR(rdev);
126		}
127	}
128
129	return 0;
130}
131
132static struct platform_driver rn5t618_regulator_driver = {
133	.probe = rn5t618_regulator_probe,
134	.driver = {
135		.name	= "rn5t618-regulator",
136	},
137};
138
139module_platform_driver(rn5t618_regulator_driver);
140
141MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
142MODULE_DESCRIPTION("RN5T618 regulator driver");
143MODULE_LICENSE("GPL v2");
144