1// SPDX-License-Identifier: GPL-2.0+
2//
3// MFD core driver for the Maxim MAX77843
4//
5// Copyright (C) 2015 Samsung Electronics
6// Author: Jaewon Kim <jaewon02.kim@samsung.com>
7// Author: Beomho Seo <beomho.seo@samsung.com>
8
9#include <linux/err.h>
10#include <linux/i2c.h>
11#include <linux/init.h>
12#include <linux/interrupt.h>
13#include <linux/mfd/core.h>
14#include <linux/mfd/max77693-common.h>
15#include <linux/mfd/max77843-private.h>
16#include <linux/mod_devicetable.h>
17#include <linux/platform_device.h>
18
19static const struct mfd_cell max77843_devs[] = {
20	{
21		.name = "max77843-muic",
22		.of_compatible = "maxim,max77843-muic",
23	}, {
24		.name = "max77843-regulator",
25		.of_compatible = "maxim,max77843-regulator",
26	}, {
27		.name = "max77843-charger",
28		.of_compatible = "maxim,max77843-charger"
29	}, {
30		.name = "max77843-fuelgauge",
31		.of_compatible = "maxim,max77843-fuelgauge",
32	}, {
33		.name = "max77843-haptic",
34		.of_compatible = "maxim,max77843-haptic",
35	},
36};
37
38static const struct regmap_config max77843_charger_regmap_config = {
39	.reg_bits	= 8,
40	.val_bits	= 8,
41	.max_register	= MAX77843_CHG_REG_END,
42};
43
44static const struct regmap_config max77843_regmap_config = {
45	.reg_bits	= 8,
46	.val_bits	= 8,
47	.max_register	= MAX77843_SYS_REG_END,
48};
49
50static const struct regmap_irq max77843_irqs[] = {
51	/* TOPSYS interrupts */
52	{ .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSUVLO_INT, },
53	{ .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSOVLO_INT, },
54	{ .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TSHDN_INT, },
55	{ .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TM_INT, },
56};
57
58static const struct regmap_irq_chip max77843_irq_chip = {
59	.name		= "max77843",
60	.status_base	= MAX77843_SYS_REG_SYSINTSRC,
61	.mask_base	= MAX77843_SYS_REG_SYSINTMASK,
62	.num_regs	= 1,
63	.irqs		= max77843_irqs,
64	.num_irqs	= ARRAY_SIZE(max77843_irqs),
65};
66
67/* Charger and Charger regulator use same regmap. */
68static int max77843_chg_init(struct max77693_dev *max77843)
69{
70	int ret;
71
72	max77843->i2c_chg = i2c_new_dummy_device(max77843->i2c->adapter, I2C_ADDR_CHG);
73	if (IS_ERR(max77843->i2c_chg)) {
74		dev_err(&max77843->i2c->dev,
75				"Cannot allocate I2C device for Charger\n");
76		return PTR_ERR(max77843->i2c_chg);
77	}
78	i2c_set_clientdata(max77843->i2c_chg, max77843);
79
80	max77843->regmap_chg = devm_regmap_init_i2c(max77843->i2c_chg,
81			&max77843_charger_regmap_config);
82	if (IS_ERR(max77843->regmap_chg)) {
83		ret = PTR_ERR(max77843->regmap_chg);
84		goto err_chg_i2c;
85	}
86
87	return 0;
88
89err_chg_i2c:
90	i2c_unregister_device(max77843->i2c_chg);
91
92	return ret;
93}
94
95static int max77843_probe(struct i2c_client *i2c)
96{
97	const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
98	struct max77693_dev *max77843;
99	unsigned int reg_data;
100	int ret;
101
102	max77843 = devm_kzalloc(&i2c->dev, sizeof(*max77843), GFP_KERNEL);
103	if (!max77843)
104		return -ENOMEM;
105
106	i2c_set_clientdata(i2c, max77843);
107	max77843->dev = &i2c->dev;
108	max77843->i2c = i2c;
109	max77843->irq = i2c->irq;
110	max77843->type = id->driver_data;
111
112	max77843->regmap = devm_regmap_init_i2c(i2c,
113			&max77843_regmap_config);
114	if (IS_ERR(max77843->regmap)) {
115		dev_err(&i2c->dev, "Failed to allocate topsys register map\n");
116		return PTR_ERR(max77843->regmap);
117	}
118
119	ret = regmap_add_irq_chip(max77843->regmap, max77843->irq,
120			IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
121			0, &max77843_irq_chip, &max77843->irq_data_topsys);
122	if (ret) {
123		dev_err(&i2c->dev, "Failed to add TOPSYS IRQ chip\n");
124		return ret;
125	}
126
127	ret = regmap_read(max77843->regmap,
128			MAX77843_SYS_REG_PMICID, &reg_data);
129	if (ret < 0) {
130		dev_err(&i2c->dev, "Failed to read PMIC ID\n");
131		goto err_pmic_id;
132	}
133	dev_info(&i2c->dev, "device ID: 0x%x\n", reg_data);
134
135	ret = max77843_chg_init(max77843);
136	if (ret) {
137		dev_err(&i2c->dev, "Failed to init Charger\n");
138		goto err_pmic_id;
139	}
140
141	ret = regmap_update_bits(max77843->regmap,
142				 MAX77843_SYS_REG_INTSRCMASK,
143				 MAX77843_INTSRC_MASK_MASK,
144				 (unsigned int)~MAX77843_INTSRC_MASK_MASK);
145	if (ret < 0) {
146		dev_err(&i2c->dev, "Failed to unmask interrupt source\n");
147		goto err_pmic_id;
148	}
149
150	ret = mfd_add_devices(max77843->dev, -1, max77843_devs,
151			      ARRAY_SIZE(max77843_devs), NULL, 0, NULL);
152	if (ret < 0) {
153		dev_err(&i2c->dev, "Failed to add mfd device\n");
154		goto err_pmic_id;
155	}
156
157	device_init_wakeup(max77843->dev, true);
158
159	return 0;
160
161err_pmic_id:
162	regmap_del_irq_chip(max77843->irq, max77843->irq_data_topsys);
163
164	return ret;
165}
166
167static const struct of_device_id max77843_dt_match[] = {
168	{ .compatible = "maxim,max77843", },
169	{ },
170};
171
172static const struct i2c_device_id max77843_id[] = {
173	{ "max77843", TYPE_MAX77843, },
174	{ },
175};
176
177static int __maybe_unused max77843_suspend(struct device *dev)
178{
179	struct i2c_client *i2c = to_i2c_client(dev);
180	struct max77693_dev *max77843 = i2c_get_clientdata(i2c);
181
182	disable_irq(max77843->irq);
183	if (device_may_wakeup(dev))
184		enable_irq_wake(max77843->irq);
185
186	return 0;
187}
188
189static int __maybe_unused max77843_resume(struct device *dev)
190{
191	struct i2c_client *i2c = to_i2c_client(dev);
192	struct max77693_dev *max77843 = i2c_get_clientdata(i2c);
193
194	if (device_may_wakeup(dev))
195		disable_irq_wake(max77843->irq);
196	enable_irq(max77843->irq);
197
198	return 0;
199}
200
201static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume);
202
203static struct i2c_driver max77843_i2c_driver = {
204	.driver	= {
205		.name = "max77843",
206		.pm = &max77843_pm,
207		.of_match_table = max77843_dt_match,
208		.suppress_bind_attrs = true,
209	},
210	.probe = max77843_probe,
211	.id_table = max77843_id,
212};
213
214static int __init max77843_i2c_init(void)
215{
216	return i2c_add_driver(&max77843_i2c_driver);
217}
218subsys_initcall(max77843_i2c_init);
219