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		.name = "rt5033-led",
 52		.of_compatible = "richtek,rt5033-led",
 53	},
 54};
 55
 56static const struct regmap_config rt5033_regmap_config = {
 57	.reg_bits	= 8,
 58	.val_bits	= 8,
 59	.max_register	= RT5033_REG_END,
 60};
 61
 62static int rt5033_i2c_probe(struct i2c_client *i2c,
 63				const struct i2c_device_id *id)
 64{
 65	struct rt5033_dev *rt5033;
 66	unsigned int dev_id;
 67	int ret;
 68
 69	rt5033 = devm_kzalloc(&i2c->dev, sizeof(*rt5033), GFP_KERNEL);
 70	if (!rt5033)
 71		return -ENOMEM;
 72
 73	i2c_set_clientdata(i2c, rt5033);
 74	rt5033->dev = &i2c->dev;
 75	rt5033->irq = i2c->irq;
 76	rt5033->wakeup = true;
 77
 78	rt5033->regmap = devm_regmap_init_i2c(i2c, &rt5033_regmap_config);
 79	if (IS_ERR(rt5033->regmap)) {
 80		dev_err(&i2c->dev, "Failed to allocate register map.\n");
 81		return PTR_ERR(rt5033->regmap);
 82	}
 83
 84	ret = regmap_read(rt5033->regmap, RT5033_REG_DEVICE_ID, &dev_id);
 85	if (ret) {
 86		dev_err(&i2c->dev, "Device not found\n");
 87		return -ENODEV;
 88	}
 89	dev_info(&i2c->dev, "Device found Device ID: %04x\n", dev_id);
 90
 91	ret = regmap_add_irq_chip(rt5033->regmap, rt5033->irq,
 92			IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 93			0, &rt5033_irq_chip, &rt5033->irq_data);
 94	if (ret) {
 95		dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
 96							rt5033->irq, ret);
 97		return ret;
 98	}
 99
100	ret = devm_mfd_add_devices(rt5033->dev, -1, rt5033_devs,
101				   ARRAY_SIZE(rt5033_devs), NULL, 0,
102				   regmap_irq_get_domain(rt5033->irq_data));
103	if (ret < 0) {
104		dev_err(&i2c->dev, "Failed to add RT5033 child devices.\n");
105		return ret;
106	}
107
108	device_init_wakeup(rt5033->dev, rt5033->wakeup);
109
110	return 0;
111}
112
113static const struct i2c_device_id rt5033_i2c_id[] = {
114	{ "rt5033", },
115	{ }
116};
117MODULE_DEVICE_TABLE(i2c, rt5033_i2c_id);
118
119static const struct of_device_id rt5033_dt_match[] = {
120	{ .compatible = "richtek,rt5033", },
121	{ }
122};
123MODULE_DEVICE_TABLE(of, rt5033_dt_match);
124
125static struct i2c_driver rt5033_driver = {
126	.driver = {
127		.name = "rt5033",
128		.of_match_table = of_match_ptr(rt5033_dt_match),
129	},
130	.probe = rt5033_i2c_probe,
131	.id_table = rt5033_i2c_id,
132};
133module_i2c_driver(rt5033_driver);
134
135MODULE_DESCRIPTION("Richtek RT5033 multi-function core driver");
136MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
137MODULE_LICENSE("GPL");