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/of_device.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 .mask_invert = false,
63 .num_regs = 1,
64 .irqs = max77843_irqs,
65 .num_irqs = ARRAY_SIZE(max77843_irqs),
66};
67
68/* Charger and Charger regulator use same regmap. */
69static int max77843_chg_init(struct max77693_dev *max77843)
70{
71 int ret;
72
73 max77843->i2c_chg = i2c_new_dummy(max77843->i2c->adapter, I2C_ADDR_CHG);
74 if (!max77843->i2c_chg) {
75 dev_err(&max77843->i2c->dev,
76 "Cannot allocate I2C device for Charger\n");
77 return -ENODEV;
78 }
79 i2c_set_clientdata(max77843->i2c_chg, max77843);
80
81 max77843->regmap_chg = devm_regmap_init_i2c(max77843->i2c_chg,
82 &max77843_charger_regmap_config);
83 if (IS_ERR(max77843->regmap_chg)) {
84 ret = PTR_ERR(max77843->regmap_chg);
85 goto err_chg_i2c;
86 }
87
88 return 0;
89
90err_chg_i2c:
91 i2c_unregister_device(max77843->i2c_chg);
92
93 return ret;
94}
95
96static int max77843_probe(struct i2c_client *i2c,
97 const struct i2c_device_id *id)
98{
99 struct max77693_dev *max77843;
100 unsigned int reg_data;
101 int ret;
102
103 max77843 = devm_kzalloc(&i2c->dev, sizeof(*max77843), GFP_KERNEL);
104 if (!max77843)
105 return -ENOMEM;
106
107 i2c_set_clientdata(i2c, max77843);
108 max77843->dev = &i2c->dev;
109 max77843->i2c = i2c;
110 max77843->irq = i2c->irq;
111 max77843->type = id->driver_data;
112
113 max77843->regmap = devm_regmap_init_i2c(i2c,
114 &max77843_regmap_config);
115 if (IS_ERR(max77843->regmap)) {
116 dev_err(&i2c->dev, "Failed to allocate topsys register map\n");
117 return PTR_ERR(max77843->regmap);
118 }
119
120 ret = regmap_add_irq_chip(max77843->regmap, max77843->irq,
121 IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
122 0, &max77843_irq_chip, &max77843->irq_data_topsys);
123 if (ret) {
124 dev_err(&i2c->dev, "Failed to add TOPSYS IRQ chip\n");
125 return ret;
126 }
127
128 ret = regmap_read(max77843->regmap,
129 MAX77843_SYS_REG_PMICID, &reg_data);
130 if (ret < 0) {
131 dev_err(&i2c->dev, "Failed to read PMIC ID\n");
132 goto err_pmic_id;
133 }
134 dev_info(&i2c->dev, "device ID: 0x%x\n", reg_data);
135
136 ret = max77843_chg_init(max77843);
137 if (ret) {
138 dev_err(&i2c->dev, "Failed to init Charger\n");
139 goto err_pmic_id;
140 }
141
142 ret = regmap_update_bits(max77843->regmap,
143 MAX77843_SYS_REG_INTSRCMASK,
144 MAX77843_INTSRC_MASK_MASK,
145 (unsigned int)~MAX77843_INTSRC_MASK_MASK);
146 if (ret < 0) {
147 dev_err(&i2c->dev, "Failed to unmask interrupt source\n");
148 goto err_pmic_id;
149 }
150
151 ret = mfd_add_devices(max77843->dev, -1, max77843_devs,
152 ARRAY_SIZE(max77843_devs), NULL, 0, NULL);
153 if (ret < 0) {
154 dev_err(&i2c->dev, "Failed to add mfd device\n");
155 goto err_pmic_id;
156 }
157
158 device_init_wakeup(max77843->dev, true);
159
160 return 0;
161
162err_pmic_id:
163 regmap_del_irq_chip(max77843->irq, max77843->irq_data_topsys);
164
165 return ret;
166}
167
168static const struct of_device_id max77843_dt_match[] = {
169 { .compatible = "maxim,max77843", },
170 { },
171};
172
173static const struct i2c_device_id max77843_id[] = {
174 { "max77843", TYPE_MAX77843, },
175 { },
176};
177
178static int __maybe_unused max77843_suspend(struct device *dev)
179{
180 struct i2c_client *i2c = to_i2c_client(dev);
181 struct max77693_dev *max77843 = i2c_get_clientdata(i2c);
182
183 disable_irq(max77843->irq);
184 if (device_may_wakeup(dev))
185 enable_irq_wake(max77843->irq);
186
187 return 0;
188}
189
190static int __maybe_unused max77843_resume(struct device *dev)
191{
192 struct i2c_client *i2c = to_i2c_client(dev);
193 struct max77693_dev *max77843 = i2c_get_clientdata(i2c);
194
195 if (device_may_wakeup(dev))
196 disable_irq_wake(max77843->irq);
197 enable_irq(max77843->irq);
198
199 return 0;
200}
201
202static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume);
203
204static struct i2c_driver max77843_i2c_driver = {
205 .driver = {
206 .name = "max77843",
207 .pm = &max77843_pm,
208 .of_match_table = max77843_dt_match,
209 .suppress_bind_attrs = true,
210 },
211 .probe = max77843_probe,
212 .id_table = max77843_id,
213};
214
215static int __init max77843_i2c_init(void)
216{
217 return i2c_add_driver(&max77843_i2c_driver);
218}
219subsys_initcall(max77843_i2c_init);
220