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c7f585fe JK |
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/max77843-private.h> | |
21 | #include <linux/of_device.h> | |
22 | #include <linux/platform_device.h> | |
23 | ||
24 | static const struct mfd_cell max77843_devs[] = { | |
25 | { | |
26 | .name = "max77843-muic", | |
27 | .of_compatible = "maxim,max77843-muic", | |
28 | }, { | |
29 | .name = "max77843-regulator", | |
30 | .of_compatible = "maxim,max77843-regulator", | |
31 | }, { | |
32 | .name = "max77843-charger", | |
33 | .of_compatible = "maxim,max77843-charger" | |
34 | }, { | |
35 | .name = "max77843-fuelgauge", | |
36 | .of_compatible = "maxim,max77843-fuelgauge", | |
37 | }, { | |
38 | .name = "max77843-haptic", | |
39 | .of_compatible = "maxim,max77843-haptic", | |
40 | }, | |
41 | }; | |
42 | ||
43 | static const struct regmap_config max77843_charger_regmap_config = { | |
44 | .reg_bits = 8, | |
45 | .val_bits = 8, | |
46 | .max_register = MAX77843_CHG_REG_END, | |
47 | }; | |
48 | ||
49 | static const struct regmap_config max77843_regmap_config = { | |
50 | .reg_bits = 8, | |
51 | .val_bits = 8, | |
52 | .max_register = MAX77843_SYS_REG_END, | |
53 | }; | |
54 | ||
55 | static const struct regmap_irq max77843_irqs[] = { | |
56 | /* TOPSYS interrupts */ | |
57 | { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSUVLO_INT, }, | |
58 | { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_SYSOVLO_INT, }, | |
59 | { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TSHDN_INT, }, | |
60 | { .reg_offset = 0, .mask = MAX77843_SYS_IRQ_TM_INT, }, | |
61 | }; | |
62 | ||
63 | static const struct regmap_irq_chip max77843_irq_chip = { | |
64 | .name = "max77843", | |
65 | .status_base = MAX77843_SYS_REG_SYSINTSRC, | |
66 | .mask_base = MAX77843_SYS_REG_SYSINTMASK, | |
67 | .mask_invert = false, | |
68 | .num_regs = 1, | |
69 | .irqs = max77843_irqs, | |
70 | .num_irqs = ARRAY_SIZE(max77843_irqs), | |
71 | }; | |
72 | ||
73 | /* Charger and Charger regulator use same regmap. */ | |
74 | static int max77843_chg_init(struct max77843 *max77843) | |
75 | { | |
76 | int ret; | |
77 | ||
78 | max77843->i2c_chg = i2c_new_dummy(max77843->i2c->adapter, I2C_ADDR_CHG); | |
79 | if (!max77843->i2c_chg) { | |
80 | dev_err(&max77843->i2c->dev, | |
81 | "Cannot allocate I2C device for Charger\n"); | |
82 | return PTR_ERR(max77843->i2c_chg); | |
83 | } | |
84 | i2c_set_clientdata(max77843->i2c_chg, max77843); | |
85 | ||
86 | max77843->regmap_chg = devm_regmap_init_i2c(max77843->i2c_chg, | |
87 | &max77843_charger_regmap_config); | |
88 | if (IS_ERR(max77843->regmap_chg)) { | |
89 | ret = PTR_ERR(max77843->regmap_chg); | |
90 | goto err_chg_i2c; | |
91 | } | |
92 | ||
93 | return 0; | |
94 | ||
95 | err_chg_i2c: | |
96 | i2c_unregister_device(max77843->i2c_chg); | |
97 | ||
98 | return ret; | |
99 | } | |
100 | ||
101 | static int max77843_probe(struct i2c_client *i2c, | |
102 | const struct i2c_device_id *id) | |
103 | { | |
104 | struct max77843 *max77843; | |
105 | unsigned int reg_data; | |
106 | int ret; | |
107 | ||
108 | max77843 = devm_kzalloc(&i2c->dev, sizeof(*max77843), GFP_KERNEL); | |
109 | if (!max77843) | |
110 | return -ENOMEM; | |
111 | ||
112 | i2c_set_clientdata(i2c, max77843); | |
113 | max77843->dev = &i2c->dev; | |
114 | max77843->i2c = i2c; | |
115 | max77843->irq = i2c->irq; | |
116 | ||
117 | max77843->regmap = devm_regmap_init_i2c(i2c, | |
118 | &max77843_regmap_config); | |
119 | if (IS_ERR(max77843->regmap)) { | |
120 | dev_err(&i2c->dev, "Failed to allocate topsys register map\n"); | |
121 | return PTR_ERR(max77843->regmap); | |
122 | } | |
123 | ||
124 | ret = regmap_add_irq_chip(max77843->regmap, max77843->irq, | |
125 | IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED, | |
126 | 0, &max77843_irq_chip, &max77843->irq_data); | |
127 | if (ret) { | |
128 | dev_err(&i2c->dev, "Failed to add TOPSYS IRQ chip\n"); | |
129 | return ret; | |
130 | } | |
131 | ||
132 | ret = regmap_read(max77843->regmap, | |
133 | MAX77843_SYS_REG_PMICID, ®_data); | |
134 | if (ret < 0) { | |
135 | dev_err(&i2c->dev, "Failed to read PMIC ID\n"); | |
136 | goto err_pmic_id; | |
137 | } | |
138 | dev_info(&i2c->dev, "device ID: 0x%x\n", reg_data); | |
139 | ||
140 | ret = max77843_chg_init(max77843); | |
141 | if (ret) { | |
142 | dev_err(&i2c->dev, "Failed to init Charger\n"); | |
143 | goto err_pmic_id; | |
144 | } | |
145 | ||
146 | ret = regmap_update_bits(max77843->regmap, | |
147 | MAX77843_SYS_REG_INTSRCMASK, | |
148 | MAX77843_INTSRC_MASK_MASK, | |
149 | (unsigned int)~MAX77843_INTSRC_MASK_MASK); | |
150 | if (ret < 0) { | |
151 | dev_err(&i2c->dev, "Failed to unmask interrupt source\n"); | |
152 | goto err_pmic_id; | |
153 | } | |
154 | ||
155 | ret = mfd_add_devices(max77843->dev, -1, max77843_devs, | |
156 | ARRAY_SIZE(max77843_devs), NULL, 0, NULL); | |
157 | if (ret < 0) { | |
158 | dev_err(&i2c->dev, "Failed to add mfd device\n"); | |
159 | goto err_pmic_id; | |
160 | } | |
161 | ||
162 | device_init_wakeup(max77843->dev, true); | |
163 | ||
164 | return 0; | |
165 | ||
166 | err_pmic_id: | |
167 | regmap_del_irq_chip(max77843->irq, max77843->irq_data); | |
168 | ||
169 | return ret; | |
170 | } | |
171 | ||
172 | static int max77843_remove(struct i2c_client *i2c) | |
173 | { | |
174 | struct max77843 *max77843 = i2c_get_clientdata(i2c); | |
175 | ||
176 | mfd_remove_devices(max77843->dev); | |
177 | ||
178 | regmap_del_irq_chip(max77843->irq, max77843->irq_data); | |
179 | ||
180 | i2c_unregister_device(max77843->i2c_chg); | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | static const struct of_device_id max77843_dt_match[] = { | |
186 | { .compatible = "maxim,max77843", }, | |
187 | { }, | |
188 | }; | |
189 | ||
190 | static const struct i2c_device_id max77843_id[] = { | |
191 | { "max77843", }, | |
192 | { }, | |
193 | }; | |
194 | MODULE_DEVICE_TABLE(i2c, max77843_id); | |
195 | ||
196 | static int __maybe_unused max77843_suspend(struct device *dev) | |
197 | { | |
198 | struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); | |
199 | struct max77843 *max77843 = i2c_get_clientdata(i2c); | |
200 | ||
201 | disable_irq(max77843->irq); | |
202 | if (device_may_wakeup(dev)) | |
203 | enable_irq_wake(max77843->irq); | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | static int __maybe_unused max77843_resume(struct device *dev) | |
209 | { | |
210 | struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); | |
211 | struct max77843 *max77843 = i2c_get_clientdata(i2c); | |
212 | ||
213 | if (device_may_wakeup(dev)) | |
214 | disable_irq_wake(max77843->irq); | |
215 | enable_irq(max77843->irq); | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | static SIMPLE_DEV_PM_OPS(max77843_pm, max77843_suspend, max77843_resume); | |
221 | ||
222 | static struct i2c_driver max77843_i2c_driver = { | |
223 | .driver = { | |
224 | .name = "max77843", | |
225 | .pm = &max77843_pm, | |
226 | .of_match_table = max77843_dt_match, | |
227 | }, | |
228 | .probe = max77843_probe, | |
229 | .remove = max77843_remove, | |
230 | .id_table = max77843_id, | |
231 | }; | |
232 | ||
233 | static int __init max77843_i2c_init(void) | |
234 | { | |
235 | return i2c_add_driver(&max77843_i2c_driver); | |
236 | } | |
237 | subsys_initcall(max77843_i2c_init); | |
238 | ||
239 | static void __exit max77843_i2c_exit(void) | |
240 | { | |
241 | i2c_del_driver(&max77843_i2c_driver); | |
242 | } | |
243 | module_exit(max77843_i2c_exit); |