Commit | Line | Data |
---|---|---|
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> | |
dae8a969 JL |
30 | #include <linux/mfd/core.h> |
31 | #include <linux/mfd/max77686.h> | |
32 | #include <linux/mfd/max77686-private.h> | |
33 | #include <linux/err.h> | |
34 | ||
35 | #define I2C_ADDR_RTC (0x0C >> 1) | |
36 | ||
37 | static struct mfd_cell max77686_devs[] = { | |
38 | { .name = "max77686-pmic", }, | |
39 | { .name = "max77686-rtc", }, | |
40 | }; | |
41 | ||
42 | static struct regmap_config max77686_regmap_config = { | |
43 | .reg_bits = 8, | |
44 | .val_bits = 8, | |
45 | }; | |
46 | ||
47 | static int max77686_i2c_probe(struct i2c_client *i2c, | |
48 | const struct i2c_device_id *id) | |
49 | { | |
50 | struct max77686_dev *max77686; | |
51 | struct max77686_platform_data *pdata = i2c->dev.platform_data; | |
52 | unsigned int data; | |
53 | int ret = 0; | |
54 | ||
55 | max77686 = kzalloc(sizeof(struct max77686_dev), GFP_KERNEL); | |
56 | if (max77686 == NULL) | |
57 | return -ENOMEM; | |
58 | ||
59 | max77686->regmap = regmap_init_i2c(i2c, &max77686_regmap_config); | |
60 | if (IS_ERR(max77686->regmap)) { | |
61 | ret = PTR_ERR(max77686->regmap); | |
62 | dev_err(max77686->dev, "Failed to allocate register map: %d\n", | |
63 | ret); | |
64 | kfree(max77686); | |
65 | return ret; | |
66 | } | |
67 | ||
68 | i2c_set_clientdata(i2c, max77686); | |
69 | max77686->dev = &i2c->dev; | |
70 | max77686->i2c = i2c; | |
71 | max77686->type = id->driver_data; | |
72 | ||
73 | if (!pdata) { | |
74 | ret = -EIO; | |
75 | goto err; | |
76 | } | |
77 | ||
78 | max77686->wakeup = pdata->wakeup; | |
79 | max77686->irq_gpio = pdata->irq_gpio; | |
80 | ||
dae8a969 JL |
81 | if (regmap_read(max77686->regmap, |
82 | MAX77686_REG_DEVICE_ID, &data) < 0) { | |
83 | dev_err(max77686->dev, | |
84 | "device not found on this channel (this is not an error)\n"); | |
85 | ret = -ENODEV; | |
86 | goto err; | |
87 | } else | |
88 | dev_info(max77686->dev, "device found\n"); | |
89 | ||
90 | max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC); | |
91 | i2c_set_clientdata(max77686->rtc, max77686); | |
92 | ||
93 | max77686_irq_init(max77686); | |
94 | ||
95 | ret = mfd_add_devices(max77686->dev, -1, max77686_devs, | |
96 | ARRAY_SIZE(max77686_devs), NULL, 0); | |
97 | ||
98 | if (ret < 0) | |
99 | goto err_mfd; | |
100 | ||
101 | return ret; | |
102 | ||
103 | err_mfd: | |
104 | mfd_remove_devices(max77686->dev); | |
105 | i2c_unregister_device(max77686->rtc); | |
106 | err: | |
107 | kfree(max77686); | |
108 | return ret; | |
109 | } | |
110 | ||
111 | static int max77686_i2c_remove(struct i2c_client *i2c) | |
112 | { | |
113 | struct max77686_dev *max77686 = i2c_get_clientdata(i2c); | |
114 | ||
115 | mfd_remove_devices(max77686->dev); | |
116 | i2c_unregister_device(max77686->rtc); | |
117 | kfree(max77686); | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
122 | static const struct i2c_device_id max77686_i2c_id[] = { | |
123 | { "max77686", TYPE_MAX77686 }, | |
124 | { } | |
125 | }; | |
126 | MODULE_DEVICE_TABLE(i2c, max77686_i2c_id); | |
127 | ||
128 | static struct i2c_driver max77686_i2c_driver = { | |
129 | .driver = { | |
130 | .name = "max77686", | |
131 | .owner = THIS_MODULE, | |
132 | }, | |
133 | .probe = max77686_i2c_probe, | |
134 | .remove = max77686_i2c_remove, | |
135 | .id_table = max77686_i2c_id, | |
136 | }; | |
137 | ||
138 | static int __init max77686_i2c_init(void) | |
139 | { | |
140 | return i2c_add_driver(&max77686_i2c_driver); | |
141 | } | |
142 | /* init early so consumer devices can complete system boot */ | |
143 | subsys_initcall(max77686_i2c_init); | |
144 | ||
145 | static void __exit max77686_i2c_exit(void) | |
146 | { | |
147 | i2c_del_driver(&max77686_i2c_driver); | |
148 | } | |
149 | module_exit(max77686_i2c_exit); | |
150 | ||
151 | MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver"); | |
152 | MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>"); | |
153 | MODULE_LICENSE("GPL"); |