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dae8a969 JL |
1 | /* |
2 | * max77686.c - mfd core driver for the Maxim 77686 | |
3 | * | |
4 | * Copyright (C) 2012 Samsung Electronics | |
5 | * Chiwoong Byun <woong.byun@smasung.com> | |
6 | * Jonghwa Lee <jonghwa3.lee@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 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | * | |
22 | * This driver is based on max8997.c | |
23 | */ | |
24 | ||
25 | #include <linux/export.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/i2c.h> | |
28 | #include <linux/pm_runtime.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/mutex.h> | |
31 | #include <linux/mfd/core.h> | |
32 | #include <linux/mfd/max77686.h> | |
33 | #include <linux/mfd/max77686-private.h> | |
34 | #include <linux/err.h> | |
35 | ||
36 | #define I2C_ADDR_RTC (0x0C >> 1) | |
37 | ||
38 | static struct mfd_cell max77686_devs[] = { | |
39 | { .name = "max77686-pmic", }, | |
40 | { .name = "max77686-rtc", }, | |
41 | }; | |
42 | ||
43 | static struct regmap_config max77686_regmap_config = { | |
44 | .reg_bits = 8, | |
45 | .val_bits = 8, | |
46 | }; | |
47 | ||
48 | static int max77686_i2c_probe(struct i2c_client *i2c, | |
49 | const struct i2c_device_id *id) | |
50 | { | |
51 | struct max77686_dev *max77686; | |
52 | struct max77686_platform_data *pdata = i2c->dev.platform_data; | |
53 | unsigned int data; | |
54 | int ret = 0; | |
55 | ||
56 | max77686 = kzalloc(sizeof(struct max77686_dev), GFP_KERNEL); | |
57 | if (max77686 == NULL) | |
58 | return -ENOMEM; | |
59 | ||
60 | max77686->regmap = regmap_init_i2c(i2c, &max77686_regmap_config); | |
61 | if (IS_ERR(max77686->regmap)) { | |
62 | ret = PTR_ERR(max77686->regmap); | |
63 | dev_err(max77686->dev, "Failed to allocate register map: %d\n", | |
64 | ret); | |
65 | kfree(max77686); | |
66 | return ret; | |
67 | } | |
68 | ||
69 | i2c_set_clientdata(i2c, max77686); | |
70 | max77686->dev = &i2c->dev; | |
71 | max77686->i2c = i2c; | |
72 | max77686->type = id->driver_data; | |
73 | ||
74 | if (!pdata) { | |
75 | ret = -EIO; | |
76 | goto err; | |
77 | } | |
78 | ||
79 | max77686->wakeup = pdata->wakeup; | |
80 | max77686->irq_gpio = pdata->irq_gpio; | |
81 | ||
82 | mutex_init(&max77686->iolock); | |
83 | ||
84 | if (regmap_read(max77686->regmap, | |
85 | MAX77686_REG_DEVICE_ID, &data) < 0) { | |
86 | dev_err(max77686->dev, | |
87 | "device not found on this channel (this is not an error)\n"); | |
88 | ret = -ENODEV; | |
89 | goto err; | |
90 | } else | |
91 | dev_info(max77686->dev, "device found\n"); | |
92 | ||
93 | max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC); | |
94 | i2c_set_clientdata(max77686->rtc, max77686); | |
95 | ||
96 | max77686_irq_init(max77686); | |
97 | ||
98 | ret = mfd_add_devices(max77686->dev, -1, max77686_devs, | |
99 | ARRAY_SIZE(max77686_devs), NULL, 0); | |
100 | ||
101 | if (ret < 0) | |
102 | goto err_mfd; | |
103 | ||
104 | return ret; | |
105 | ||
106 | err_mfd: | |
107 | mfd_remove_devices(max77686->dev); | |
108 | i2c_unregister_device(max77686->rtc); | |
109 | err: | |
110 | kfree(max77686); | |
111 | return ret; | |
112 | } | |
113 | ||
114 | static int max77686_i2c_remove(struct i2c_client *i2c) | |
115 | { | |
116 | struct max77686_dev *max77686 = i2c_get_clientdata(i2c); | |
117 | ||
118 | mfd_remove_devices(max77686->dev); | |
119 | i2c_unregister_device(max77686->rtc); | |
120 | kfree(max77686); | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static const struct i2c_device_id max77686_i2c_id[] = { | |
126 | { "max77686", TYPE_MAX77686 }, | |
127 | { } | |
128 | }; | |
129 | MODULE_DEVICE_TABLE(i2c, max77686_i2c_id); | |
130 | ||
131 | static struct i2c_driver max77686_i2c_driver = { | |
132 | .driver = { | |
133 | .name = "max77686", | |
134 | .owner = THIS_MODULE, | |
135 | }, | |
136 | .probe = max77686_i2c_probe, | |
137 | .remove = max77686_i2c_remove, | |
138 | .id_table = max77686_i2c_id, | |
139 | }; | |
140 | ||
141 | static int __init max77686_i2c_init(void) | |
142 | { | |
143 | return i2c_add_driver(&max77686_i2c_driver); | |
144 | } | |
145 | /* init early so consumer devices can complete system boot */ | |
146 | subsys_initcall(max77686_i2c_init); | |
147 | ||
148 | static void __exit max77686_i2c_exit(void) | |
149 | { | |
150 | i2c_del_driver(&max77686_i2c_driver); | |
151 | } | |
152 | module_exit(max77686_i2c_exit); | |
153 | ||
154 | MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver"); | |
155 | MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>"); | |
156 | MODULE_LICENSE("GPL"); |