ACPI: processor idle: Practically limit "Dummy wait" workaround to old Intel systems
[platform/kernel/linux-rpi.git] / drivers / mfd / max77843.c
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. */
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
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
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
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
215 static int __init max77843_i2c_init(void)
216 {
217         return i2c_add_driver(&max77843_i2c_driver);
218 }
219 subsys_initcall(max77843_i2c_init);