1/*
2 * MFD core driver for the Maxim MAX77843
3 *
4 * Copyright (C) 2015 Samsung Electronics
5 * Author: Jaewon Kim <jaewon02.kim@samsung.com>
6 * Author: Beomho Seo <beomho.seo@samsung.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14#include <linux/err.h>
15#include <linux/i2c.h>
16#include <linux/init.h>
17#include <linux/interrupt.h>
18#include <linux/module.h>
19#include <linux/mfd/core.h>
20#include <linux/mfd/max77843-private.h>
21#include <linux/of_device.h>
22#include <linux/platform_device.h>
23
24static const struct mfd_cell max77843_devs[] = {
25	{
26		.name = "max77843-muic",
27		.of_compatible = "maxim,max77843-muic",
28	}, {
29		.name = "max77843-regulator",
30		.of_compatible = "maxim,max77843-regulator",
31	}, {
32		.name = "max77843-charger",
33		.of_compatible = "maxim,max77843-charger"
34	}, {
35		.name = "max77843-fuelgauge",
36		.of_compatible = "maxim,max77843-fuelgauge",
37	}, {
38		.name = "max77843-haptic",
39		.of_compatible = "maxim,max77843-haptic",
40	},
41};
42
43static const struct regmap_config max77843_charger_regmap_config = {
44	.reg_bits	= 8,
45	.val_bits	= 8,
46	.max_register	= MAX77843_CHG_REG_END,
47};
48
49static const struct regmap_config max77843_regmap_config = {
50	.reg_bits	= 8,
51	.val_bits	= 8,
52	.max_register	= MAX77843_SYS_REG_END,
53};
54
55static const struct regmap_irq max77843_irqs[] = {
56	/* TOPSYS interrupts */
57	{ .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSUVLO_INT, },
58	{ .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSOVLO_INT, },
59	{ .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TSHDN_INT, },
60	{ .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TM_INT, },
61};
62
63static const struct regmap_irq_chip max77843_irq_chip = {
64	.name		= "max77843",
65	.status_base	= MAX77843_SYS_REG_SYSINTSRC,
66	.mask_base	= MAX77843_SYS_REG_SYSINTMASK,
67	.mask_invert	= false,
68	.num_regs	= 1,
69	.irqs		= max77843_irqs,
70	.num_irqs	= ARRAY_SIZE(max77843_irqs),
71};
72
73/* Charger and Charger regulator use same regmap. */
74static int max77843_chg_init(struct max77843 *max77843)
75{
76	int ret;
77
78	max77843->i2c_chg = i2c_new_dummy(max77843->i2c->adapter, I2C_ADDR_CHG);
79	if (!max77843->i2c_chg) {
80		dev_err(&max77843->i2c->dev,
81				"Cannot allocate I2C device for Charger\n");
82		return -ENODEV;
83	}
84	i2c_set_clientdata(max77843->i2c_chg, max77843);
85
86	max77843->regmap_chg = devm_regmap_init_i2c(max77843->i2c_chg,
87			&max77843_charger_regmap_config);
88	if (IS_ERR(max77843->regmap_chg)) {
89		ret = PTR_ERR(max77843->regmap_chg);
90		goto err_chg_i2c;
91	}
92
93	return 0;
94
95err_chg_i2c:
96	i2c_unregister_device(max77843->i2c_chg);
97
98	return ret;
99}
100
101static int max77843_probe(struct i2c_client *i2c,
102			  const struct i2c_device_id *id)
103{
104	struct max77843 *max77843;
105	unsigned int reg_data;
106	int ret;
107
108	max77843 = devm_kzalloc(&i2c->dev, sizeof(*max77843), GFP_KERNEL);
109	if (!max77843)
110		return -ENOMEM;
111
112	i2c_set_clientdata(i2c, max77843);
113	max77843->dev = &i2c->dev;
114	max77843->i2c = i2c;
115	max77843->irq = i2c->irq;
116
117	max77843->regmap = devm_regmap_init_i2c(i2c,
118			&max77843_regmap_config);
119	if (IS_ERR(max77843->regmap)) {
120		dev_err(&i2c->dev, "Failed to allocate topsys register map\n");
121		return PTR_ERR(max77843->regmap);
122	}
123
124	ret = regmap_add_irq_chip(max77843->regmap, max77843->irq,
125			IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
126			0, &max77843_irq_chip, &max77843->irq_data);
127	if (ret) {
128		dev_err(&i2c->dev, "Failed to add TOPSYS IRQ chip\n");
129		return ret;
130	}
131
132	ret = regmap_read(max77843->regmap,
133			MAX77843_SYS_REG_PMICID, &reg_data);
134	if (ret < 0) {
135		dev_err(&i2c->dev, "Failed to read PMIC ID\n");
136		goto err_pmic_id;
137	}
138	dev_info(&i2c->dev, "device ID: 0x%x\n", reg_data);
139
140	ret = max77843_chg_init(max77843);
141	if (ret) {
142		dev_err(&i2c->dev, "Failed to init Charger\n");
143		goto err_pmic_id;
144	}
145
146	ret = regmap_update_bits(max77843->regmap,
147				 MAX77843_SYS_REG_INTSRCMASK,
148				 MAX77843_INTSRC_MASK_MASK,
149				 (unsigned int)~MAX77843_INTSRC_MASK_MASK);
150	if (ret < 0) {
151		dev_err(&i2c->dev, "Failed to unmask interrupt source\n");
152		goto err_pmic_id;
153	}
154
155	ret = mfd_add_devices(max77843->dev, -1, max77843_devs,
156			      ARRAY_SIZE(max77843_devs), NULL, 0, NULL);
157	if (ret < 0) {
158		dev_err(&i2c->dev, "Failed to add mfd device\n");
159		goto err_pmic_id;
160	}
161
162	device_init_wakeup(max77843->dev, true);
163
164	return 0;
165
166err_pmic_id:
167	regmap_del_irq_chip(max77843->irq, max77843->irq_data);
168
169	return ret;
170}
171
172static int max77843_remove(struct i2c_client *i2c)
173{
174	struct max77843 *max77843 = i2c_get_clientdata(i2c);
175
176	mfd_remove_devices(max77843->dev);
177
178	regmap_del_irq_chip(max77843->irq, max77843->irq_data);
179
180	i2c_unregister_device(max77843->i2c_chg);
181
182	return 0;
183}
184
185static const struct of_device_id max77843_dt_match[] = {
186	{ .compatible = "maxim,max77843", },
187	{ },
188};
189
190static const struct i2c_device_id max77843_id[] = {
191	{ "max77843", },
192	{ },
193};
194MODULE_DEVICE_TABLE(i2c, max77843_id);
195
196static int __maybe_unused max77843_suspend(struct device *dev)
197{
198	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
199	struct max77843 *max77843 = i2c_get_clientdata(i2c);
200
201	disable_irq(max77843->irq);
202	if (device_may_wakeup(dev))
203		enable_irq_wake(max77843->irq);
204
205	return 0;
206}
207
208static int __maybe_unused max77843_resume(struct device *dev)
209{
210	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
211	struct max77843 *max77843 = i2c_get_clientdata(i2c);
212
213	if (device_may_wakeup(dev))
214		disable_irq_wake(max77843->irq);
215	enable_irq(max77843->irq);
216
217	return 0;
218}
219
220static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume);
221
222static struct i2c_driver max77843_i2c_driver = {
223	.driver	= {
224		.name = "max77843",
225		.pm = &max77843_pm,
226		.of_match_table = max77843_dt_match,
227	},
228	.probe = max77843_probe,
229	.remove = max77843_remove,
230	.id_table = max77843_id,
231};
232
233static int __init max77843_i2c_init(void)
234{
235	return i2c_add_driver(&max77843_i2c_driver);
236}
237subsys_initcall(max77843_i2c_init);
238
239static void __exit max77843_i2c_exit(void)
240{
241	i2c_del_driver(&max77843_i2c_driver);
242}
243module_exit(max77843_i2c_exit);
244