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/max77693-common.h>
21#include <linux/mfd/max77843-private.h>
22#include <linux/of_device.h>
23#include <linux/platform_device.h>
24
25static const struct mfd_cell max77843_devs[] = {
26	{
27		.name = "max77843-muic",
28		.of_compatible = "maxim,max77843-muic",
29	}, {
30		.name = "max77843-regulator",
31		.of_compatible = "maxim,max77843-regulator",
32	}, {
33		.name = "max77843-charger",
34		.of_compatible = "maxim,max77843-charger"
35	}, {
36		.name = "max77843-fuelgauge",
37		.of_compatible = "maxim,max77843-fuelgauge",
38	}, {
39		.name = "max77843-haptic",
40		.of_compatible = "maxim,max77843-haptic",
41	},
42};
43
44static const struct regmap_config max77843_charger_regmap_config = {
45	.reg_bits	= 8,
46	.val_bits	= 8,
47	.max_register	= MAX77843_CHG_REG_END,
48};
49
50static const struct regmap_config max77843_regmap_config = {
51	.reg_bits	= 8,
52	.val_bits	= 8,
53	.max_register	= MAX77843_SYS_REG_END,
54};
55
56static const struct regmap_irq max77843_irqs[] = {
57	/* TOPSYS interrupts */
58	{ .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSUVLO_INT, },
59	{ .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSOVLO_INT, },
60	{ .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TSHDN_INT, },
61	{ .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TM_INT, },
62};
63
64static const struct regmap_irq_chip max77843_irq_chip = {
65	.name		= "max77843",
66	.status_base	= MAX77843_SYS_REG_SYSINTSRC,
67	.mask_base	= MAX77843_SYS_REG_SYSINTMASK,
68	.mask_invert	= false,
69	.num_regs	= 1,
70	.irqs		= max77843_irqs,
71	.num_irqs	= ARRAY_SIZE(max77843_irqs),
72};
73
74/* Charger and Charger regulator use same regmap. */
75static int max77843_chg_init(struct max77693_dev *max77843)
76{
77	int ret;
78
79	max77843->i2c_chg = i2c_new_dummy(max77843->i2c->adapter, I2C_ADDR_CHG);
80	if (!max77843->i2c_chg) {
81		dev_err(&max77843->i2c->dev,
82				"Cannot allocate I2C device for Charger\n");
83		return -ENODEV;
84	}
85	i2c_set_clientdata(max77843->i2c_chg, max77843);
86
87	max77843->regmap_chg = devm_regmap_init_i2c(max77843->i2c_chg,
88			&max77843_charger_regmap_config);
89	if (IS_ERR(max77843->regmap_chg)) {
90		ret = PTR_ERR(max77843->regmap_chg);
91		goto err_chg_i2c;
92	}
93
94	return 0;
95
96err_chg_i2c:
97	i2c_unregister_device(max77843->i2c_chg);
98
99	return ret;
100}
101
102static int max77843_probe(struct i2c_client *i2c,
103			  const struct i2c_device_id *id)
104{
105	struct max77693_dev *max77843;
106	unsigned int reg_data;
107	int ret;
108
109	max77843 = devm_kzalloc(&i2c->dev, sizeof(*max77843), GFP_KERNEL);
110	if (!max77843)
111		return -ENOMEM;
112
113	i2c_set_clientdata(i2c, max77843);
114	max77843->dev = &i2c->dev;
115	max77843->i2c = i2c;
116	max77843->irq = i2c->irq;
117	max77843->type = id->driver_data;
118
119	max77843->regmap = devm_regmap_init_i2c(i2c,
120			&max77843_regmap_config);
121	if (IS_ERR(max77843->regmap)) {
122		dev_err(&i2c->dev, "Failed to allocate topsys register map\n");
123		return PTR_ERR(max77843->regmap);
124	}
125
126	ret = regmap_add_irq_chip(max77843->regmap, max77843->irq,
127			IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
128			0, &max77843_irq_chip, &max77843->irq_data_topsys);
129	if (ret) {
130		dev_err(&i2c->dev, "Failed to add TOPSYS IRQ chip\n");
131		return ret;
132	}
133
134	ret = regmap_read(max77843->regmap,
135			MAX77843_SYS_REG_PMICID, &reg_data);
136	if (ret < 0) {
137		dev_err(&i2c->dev, "Failed to read PMIC ID\n");
138		goto err_pmic_id;
139	}
140	dev_info(&i2c->dev, "device ID: 0x%x\n", reg_data);
141
142	ret = max77843_chg_init(max77843);
143	if (ret) {
144		dev_err(&i2c->dev, "Failed to init Charger\n");
145		goto err_pmic_id;
146	}
147
148	ret = regmap_update_bits(max77843->regmap,
149				 MAX77843_SYS_REG_INTSRCMASK,
150				 MAX77843_INTSRC_MASK_MASK,
151				 (unsigned int)~MAX77843_INTSRC_MASK_MASK);
152	if (ret < 0) {
153		dev_err(&i2c->dev, "Failed to unmask interrupt source\n");
154		goto err_pmic_id;
155	}
156
157	ret = mfd_add_devices(max77843->dev, -1, max77843_devs,
158			      ARRAY_SIZE(max77843_devs), NULL, 0, NULL);
159	if (ret < 0) {
160		dev_err(&i2c->dev, "Failed to add mfd device\n");
161		goto err_pmic_id;
162	}
163
164	device_init_wakeup(max77843->dev, true);
165
166	return 0;
167
168err_pmic_id:
169	regmap_del_irq_chip(max77843->irq, max77843->irq_data_topsys);
170
171	return ret;
172}
173
174static int max77843_remove(struct i2c_client *i2c)
175{
176	struct max77693_dev *max77843 = i2c_get_clientdata(i2c);
177
178	mfd_remove_devices(max77843->dev);
179
180	regmap_del_irq_chip(max77843->irq, max77843->irq_data_topsys);
181
182	i2c_unregister_device(max77843->i2c_chg);
183
184	return 0;
185}
186
187static const struct of_device_id max77843_dt_match[] = {
188	{ .compatible = "maxim,max77843", },
189	{ },
190};
191
192static const struct i2c_device_id max77843_id[] = {
193	{ "max77843", TYPE_MAX77843, },
194	{ },
195};
196MODULE_DEVICE_TABLE(i2c, max77843_id);
197
198static int __maybe_unused max77843_suspend(struct device *dev)
199{
200	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
201	struct max77693_dev *max77843 = i2c_get_clientdata(i2c);
202
203	disable_irq(max77843->irq);
204	if (device_may_wakeup(dev))
205		enable_irq_wake(max77843->irq);
206
207	return 0;
208}
209
210static int __maybe_unused max77843_resume(struct device *dev)
211{
212	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
213	struct max77693_dev *max77843 = i2c_get_clientdata(i2c);
214
215	if (device_may_wakeup(dev))
216		disable_irq_wake(max77843->irq);
217	enable_irq(max77843->irq);
218
219	return 0;
220}
221
222static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume);
223
224static struct i2c_driver max77843_i2c_driver = {
225	.driver	= {
226		.name = "max77843",
227		.pm = &max77843_pm,
228		.of_match_table = max77843_dt_match,
229	},
230	.probe = max77843_probe,
231	.remove = max77843_remove,
232	.id_table = max77843_id,
233};
234
235static int __init max77843_i2c_init(void)
236{
237	return i2c_add_driver(&max77843_i2c_driver);
238}
239subsys_initcall(max77843_i2c_init);
240
241static void __exit max77843_i2c_exit(void)
242{
243	i2c_del_driver(&max77843_i2c_driver);
244}
245module_exit(max77843_i2c_exit);
246