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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
25 static 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
44 static 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
50 static const struct regmap_config max77843_regmap_config = {
51 .reg_bits = 8,
52 .val_bits = 8,
53 .max_register = MAX77843_SYS_REG_END,
54 };
55
56 static 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
64 static 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. */
75 static 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
96 err_chg_i2c:
97 i2c_unregister_device(max77843->i2c_chg);
98
99 return ret;
100 }
101
102 static 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
168 err_pmic_id:
169 regmap_del_irq_chip(max77843->irq, max77843->irq_data_topsys);
170
171 return ret;
172 }
173
174 static 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
187 static const struct of_device_id max77843_dt_match[] = {
188 { .compatible = "maxim,max77843", },
189 { },
190 };
191
192 static const struct i2c_device_id max77843_id[] = {
193 { "max77843", TYPE_MAX77843, },
194 { },
195 };
196 MODULE_DEVICE_TABLE(i2c, max77843_id);
197
198 static int __maybe_unused max77843_suspend(struct device *dev)
199 {
200 struct i2c_client *i2c = to_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
210 static int __maybe_unused max77843_resume(struct device *dev)
211 {
212 struct i2c_client *i2c = to_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
222 static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume);
223
224 static 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
235 static int __init max77843_i2c_init(void)
236 {
237 return i2c_add_driver(&max77843_i2c_driver);
238 }
239 subsys_initcall(max77843_i2c_init);
240
241 static void __exit max77843_i2c_exit(void)
242 {
243 i2c_del_driver(&max77843_i2c_driver);
244 }
245 module_exit(max77843_i2c_exit);