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
19 static 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
38 static 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
44 static const struct regmap_config max77843_regmap_config = {
45 .reg_bits = 8,
46 .val_bits = 8,
47 .max_register = MAX77843_SYS_REG_END,
48 };
49
50 static 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
58 static 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. */
max77843_chg_init(struct max77693_dev * max77843)68 static 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
89 err_chg_i2c:
90 i2c_unregister_device(max77843->i2c_chg);
91
92 return ret;
93 }
94
max77843_probe(struct i2c_client * i2c)95 static 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, ®_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
161 err_pmic_id:
162 regmap_del_irq_chip(max77843->irq, max77843->irq_data_topsys);
163
164 return ret;
165 }
166
167 static const struct of_device_id max77843_dt_match[] = {
168 { .compatible = "maxim,max77843", },
169 { },
170 };
171
172 static const struct i2c_device_id max77843_id[] = {
173 { "max77843", TYPE_MAX77843, },
174 { },
175 };
176
max77843_suspend(struct device * dev)177 static 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
max77843_resume(struct device * dev)189 static 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
201 static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume);
202
203 static 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
max77843_i2c_init(void)214 static int __init max77843_i2c_init(void)
215 {
216 return i2c_add_driver(&max77843_i2c_driver);
217 }
218 subsys_initcall(max77843_i2c_init);
219
