1/*
2 * MFD core driver for the Richtek RT5033.
3 *
4 * RT5033 comprises multiple sub-devices switcing charger, fuel gauge,
5 * flash LED, current source, LDO and BUCK regulators.
6 *
7 * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
8 * Author: Beomho Seo <beomho.seo@samsung.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 bythe Free Software Foundation.
13 */
14
15#include <linux/err.h>
16#include <linux/module.h>
17#include <linux/interrupt.h>
18#include <linux/of_device.h>
19#include <linux/mfd/core.h>
20#include <linux/mfd/rt5033.h>
21#include <linux/mfd/rt5033-private.h>
22
23static const struct regmap_irq rt5033_irqs[] = {
24	{ .mask = RT5033_PMIC_IRQ_BUCKOCP, },
25	{ .mask = RT5033_PMIC_IRQ_BUCKLV, },
26	{ .mask = RT5033_PMIC_IRQ_SAFELDOLV, },
27	{ .mask = RT5033_PMIC_IRQ_LDOLV, },
28	{ .mask = RT5033_PMIC_IRQ_OT, },
29	{ .mask = RT5033_PMIC_IRQ_VDDA_UV, },
30};
31
32static const struct regmap_irq_chip rt5033_irq_chip = {
33	.name		= "rt5033",
34	.status_base	= RT5033_REG_PMIC_IRQ_STAT,
35	.mask_base	= RT5033_REG_PMIC_IRQ_CTRL,
36	.mask_invert	= true,
37	.num_regs	= 1,
38	.irqs		= rt5033_irqs,
39	.num_irqs	= ARRAY_SIZE(rt5033_irqs),
40};
41
42static const struct mfd_cell rt5033_devs[] = {
43	{ .name = "rt5033-regulator", },
44	{
45		.name = "rt5033-charger",
46		.of_compatible = "richtek,rt5033-charger",
47	}, {
48		.name = "rt5033-battery",
49		.of_compatible = "richtek,rt5033-battery",
50	},
51};
52
53static const struct regmap_config rt5033_regmap_config = {
54	.reg_bits	= 8,
55	.val_bits	= 8,
56	.max_register	= RT5033_REG_END,
57};
58
59static int rt5033_i2c_probe(struct i2c_client *i2c,
60				const struct i2c_device_id *id)
61{
62	struct rt5033_dev *rt5033;
63	unsigned int dev_id;
64	int ret;
65
66	rt5033 = devm_kzalloc(&i2c->dev, sizeof(*rt5033), GFP_KERNEL);
67	if (!rt5033)
68		return -ENOMEM;
69
70	i2c_set_clientdata(i2c, rt5033);
71	rt5033->dev = &i2c->dev;
72	rt5033->irq = i2c->irq;
73	rt5033->wakeup = true;
74
75	rt5033->regmap = devm_regmap_init_i2c(i2c, &rt5033_regmap_config);
76	if (IS_ERR(rt5033->regmap)) {
77		dev_err(&i2c->dev, "Failed to allocate register map.\n");
78		return PTR_ERR(rt5033->regmap);
79	}
80
81	ret = regmap_read(rt5033->regmap, RT5033_REG_DEVICE_ID, &dev_id);
82	if (ret) {
83		dev_err(&i2c->dev, "Device not found\n");
84		return -ENODEV;
85	}
86	dev_info(&i2c->dev, "Device found Device ID: %04x\n", dev_id);
87
88	ret = regmap_add_irq_chip(rt5033->regmap, rt5033->irq,
89			IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
90			0, &rt5033_irq_chip, &rt5033->irq_data);
91	if (ret) {
92		dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
93							rt5033->irq, ret);
94		return ret;
95	}
96
97	ret = mfd_add_devices(rt5033->dev, -1, rt5033_devs,
98			ARRAY_SIZE(rt5033_devs), NULL, 0,
99			regmap_irq_get_domain(rt5033->irq_data));
100	if (ret < 0) {
101		dev_err(&i2c->dev, "Failed to add RT5033 child devices.\n");
102		return ret;
103	}
104
105	device_init_wakeup(rt5033->dev, rt5033->wakeup);
106
107	return 0;
108}
109
110static int rt5033_i2c_remove(struct i2c_client *i2c)
111{
112	mfd_remove_devices(&i2c->dev);
113
114	return 0;
115}
116
117static const struct i2c_device_id rt5033_i2c_id[] = {
118	{ "rt5033", },
119	{ }
120};
121MODULE_DEVICE_TABLE(i2c, rt5033_i2c_id);
122
123static const struct of_device_id rt5033_dt_match[] = {
124	{ .compatible = "richtek,rt5033", },
125	{ }
126};
127
128static struct i2c_driver rt5033_driver = {
129	.driver = {
130		.name = "rt5033",
131		.of_match_table = of_match_ptr(rt5033_dt_match),
132	},
133	.probe = rt5033_i2c_probe,
134	.remove = rt5033_i2c_remove,
135	.id_table = rt5033_i2c_id,
136};
137module_i2c_driver(rt5033_driver);
138
139MODULE_ALIAS("i2c:rt5033");
140MODULE_DESCRIPTION("Richtek RT5033 multi-function core driver");
141MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
142MODULE_LICENSE("GPL");
143