1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * MFD core driver for the Richtek RT5033.
4  *
5  * RT5033 comprises multiple sub-devices switcing charger, fuel gauge,
6  * flash LED, current source, LDO and BUCK regulators.
7  *
8  * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
9  * Author: Beomho Seo <beomho.seo@samsung.com>
10  */
11 
12 #include <linux/err.h>
13 #include <linux/module.h>
14 #include <linux/interrupt.h>
15 #include <linux/of_device.h>
16 #include <linux/mfd/core.h>
17 #include <linux/mfd/rt5033.h>
18 #include <linux/mfd/rt5033-private.h>
19 
20 static const struct regmap_irq rt5033_irqs[] = {
21 	{ .mask = RT5033_PMIC_IRQ_BUCKOCP, },
22 	{ .mask = RT5033_PMIC_IRQ_BUCKLV, },
23 	{ .mask = RT5033_PMIC_IRQ_SAFELDOLV, },
24 	{ .mask = RT5033_PMIC_IRQ_LDOLV, },
25 	{ .mask = RT5033_PMIC_IRQ_OT, },
26 	{ .mask = RT5033_PMIC_IRQ_VDDA_UV, },
27 };
28 
29 static const struct regmap_irq_chip rt5033_irq_chip = {
30 	.name		= "rt5033",
31 	.status_base	= RT5033_REG_PMIC_IRQ_STAT,
32 	.unmask_base	= RT5033_REG_PMIC_IRQ_CTRL,
33 	.num_regs	= 1,
34 	.irqs		= rt5033_irqs,
35 	.num_irqs	= ARRAY_SIZE(rt5033_irqs),
36 };
37 
38 static const struct mfd_cell rt5033_devs[] = {
39 	{ .name = "rt5033-regulator", },
40 	{
41 		.name = "rt5033-charger",
42 		.of_compatible = "richtek,rt5033-charger",
43 	}, {
44 		.name = "rt5033-battery",
45 		.of_compatible = "richtek,rt5033-battery",
46 	}, {
47 		.name = "rt5033-led",
48 		.of_compatible = "richtek,rt5033-led",
49 	},
50 };
51 
52 static const struct regmap_config rt5033_regmap_config = {
53 	.reg_bits	= 8,
54 	.val_bits	= 8,
55 	.max_register	= RT5033_REG_END,
56 };
57 
rt5033_i2c_probe(struct i2c_client * i2c)58 static int rt5033_i2c_probe(struct i2c_client *i2c)
59 {
60 	struct rt5033_dev *rt5033;
61 	unsigned int dev_id;
62 	int ret;
63 
64 	rt5033 = devm_kzalloc(&i2c->dev, sizeof(*rt5033), GFP_KERNEL);
65 	if (!rt5033)
66 		return -ENOMEM;
67 
68 	i2c_set_clientdata(i2c, rt5033);
69 	rt5033->dev = &i2c->dev;
70 	rt5033->irq = i2c->irq;
71 	rt5033->wakeup = true;
72 
73 	rt5033->regmap = devm_regmap_init_i2c(i2c, &rt5033_regmap_config);
74 	if (IS_ERR(rt5033->regmap)) {
75 		dev_err(&i2c->dev, "Failed to allocate register map.\n");
76 		return PTR_ERR(rt5033->regmap);
77 	}
78 
79 	ret = regmap_read(rt5033->regmap, RT5033_REG_DEVICE_ID, &dev_id);
80 	if (ret) {
81 		dev_err(&i2c->dev, "Device not found\n");
82 		return -ENODEV;
83 	}
84 	dev_info(&i2c->dev, "Device found Device ID: %04x\n", dev_id);
85 
86 	ret = regmap_add_irq_chip(rt5033->regmap, rt5033->irq,
87 			IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
88 			0, &rt5033_irq_chip, &rt5033->irq_data);
89 	if (ret) {
90 		dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
91 							rt5033->irq, ret);
92 		return ret;
93 	}
94 
95 	ret = devm_mfd_add_devices(rt5033->dev, -1, rt5033_devs,
96 				   ARRAY_SIZE(rt5033_devs), NULL, 0,
97 				   regmap_irq_get_domain(rt5033->irq_data));
98 	if (ret < 0) {
99 		dev_err(&i2c->dev, "Failed to add RT5033 child devices.\n");
100 		return ret;
101 	}
102 
103 	device_init_wakeup(rt5033->dev, rt5033->wakeup);
104 
105 	return 0;
106 }
107 
108 static const struct i2c_device_id rt5033_i2c_id[] = {
109 	{ "rt5033", },
110 	{ }
111 };
112 MODULE_DEVICE_TABLE(i2c, rt5033_i2c_id);
113 
114 static const struct of_device_id rt5033_dt_match[] = {
115 	{ .compatible = "richtek,rt5033", },
116 	{ }
117 };
118 MODULE_DEVICE_TABLE(of, rt5033_dt_match);
119 
120 static struct i2c_driver rt5033_driver = {
121 	.driver = {
122 		.name = "rt5033",
123 		.of_match_table = rt5033_dt_match,
124 	},
125 	.probe_new = rt5033_i2c_probe,
126 	.id_table = rt5033_i2c_id,
127 };
128 module_i2c_driver(rt5033_driver);
129 
130 MODULE_DESCRIPTION("Richtek RT5033 multi-function core driver");
131 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
132 MODULE_LICENSE("GPL");
133