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 
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 	.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. */
max77843_chg_init(struct max77693_dev * max77843)69 static int max77843_chg_init(struct max77693_dev *max77843)
70 {
71 	int ret;
72 
73 	max77843->i2c_chg = i2c_new_dummy_device(max77843->i2c->adapter, I2C_ADDR_CHG);
74 	if (IS_ERR(max77843->i2c_chg)) {
75 		dev_err(&max77843->i2c->dev,
76 				"Cannot allocate I2C device for Charger\n");
77 		return PTR_ERR(max77843->i2c_chg);
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 
90 err_chg_i2c:
91 	i2c_unregister_device(max77843->i2c_chg);
92 
93 	return ret;
94 }
95 
max77843_probe(struct i2c_client * i2c,const struct i2c_device_id * id)96 static 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 
162 err_pmic_id:
163 	regmap_del_irq_chip(max77843->irq, max77843->irq_data_topsys);
164 
165 	return ret;
166 }
167 
168 static const struct of_device_id max77843_dt_match[] = {
169 	{ .compatible = "maxim,max77843", },
170 	{ },
171 };
172 
173 static const struct i2c_device_id max77843_id[] = {
174 	{ "max77843", TYPE_MAX77843, },
175 	{ },
176 };
177 
max77843_suspend(struct device * dev)178 static 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 
max77843_resume(struct device * dev)190 static 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 
202 static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume);
203 
204 static 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 
max77843_i2c_init(void)215 static int __init max77843_i2c_init(void)
216 {
217 	return i2c_add_driver(&max77843_i2c_driver);
218 }
219 subsys_initcall(max77843_i2c_init);
220