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156f2528 KP |
1 | /* |
2 | * max8698.c - mfd core driver for the Maxim 8998 | |
3 | * | |
4 | * Copyright (C) 2009-2010 Samsung Electronics | |
5 | * Kyungmin Park <kyungmin.park@samsung.com> | |
6 | * Marek Szyprowski <m.szyprowski@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 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/moduleparam.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/i2c.h> | |
28 | #include <linux/mutex.h> | |
29 | #include <linux/mfd/core.h> | |
30 | #include <linux/mfd/max8998.h> | |
31 | #include <linux/mfd/max8998-private.h> | |
32 | ||
33 | static struct mfd_cell max8998_devs[] = { | |
34 | { | |
35 | .name = "max8998-pmic", | |
36 | } | |
37 | }; | |
38 | ||
39 | static int max8998_i2c_device_read(struct max8998_dev *max8998, u8 reg, u8 *dest) | |
40 | { | |
41 | struct i2c_client *client = max8998->i2c_client; | |
42 | int ret; | |
43 | ||
44 | mutex_lock(&max8998->iolock); | |
45 | ret = i2c_smbus_read_byte_data(client, reg); | |
46 | mutex_unlock(&max8998->iolock); | |
47 | if (ret < 0) | |
48 | return ret; | |
49 | ||
50 | ret &= 0xff; | |
51 | *dest = ret; | |
52 | return 0; | |
53 | } | |
54 | ||
55 | static int max8998_i2c_device_write(struct max8998_dev *max8998, u8 reg, u8 value) | |
56 | { | |
57 | struct i2c_client *client = max8998->i2c_client; | |
58 | int ret; | |
59 | ||
60 | mutex_lock(&max8998->iolock); | |
61 | ret = i2c_smbus_write_byte_data(client, reg, value); | |
62 | mutex_unlock(&max8998->iolock); | |
63 | return ret; | |
64 | } | |
65 | ||
66 | static int max8998_i2c_device_update(struct max8998_dev *max8998, u8 reg, | |
67 | u8 val, u8 mask) | |
68 | { | |
69 | struct i2c_client *client = max8998->i2c_client; | |
70 | int ret; | |
71 | ||
72 | mutex_lock(&max8998->iolock); | |
73 | ret = i2c_smbus_read_byte_data(client, reg); | |
74 | if (ret >= 0) { | |
75 | u8 old_val = ret & 0xff; | |
76 | u8 new_val = (val & mask) | (old_val & (~mask)); | |
77 | ret = i2c_smbus_write_byte_data(client, reg, new_val); | |
78 | if (ret >= 0) | |
79 | ret = 0; | |
80 | } | |
81 | mutex_unlock(&max8998->iolock); | |
82 | return ret; | |
83 | } | |
84 | ||
85 | static int max8998_i2c_probe(struct i2c_client *i2c, | |
86 | const struct i2c_device_id *id) | |
87 | { | |
88 | struct max8998_dev *max8998; | |
89 | int ret = 0; | |
90 | ||
91 | max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL); | |
8f1f151e | 92 | if (max8998 == NULL) |
156f2528 | 93 | return -ENOMEM; |
156f2528 KP |
94 | |
95 | i2c_set_clientdata(i2c, max8998); | |
96 | max8998->dev = &i2c->dev; | |
97 | max8998->i2c_client = i2c; | |
98 | max8998->dev_read = max8998_i2c_device_read; | |
99 | max8998->dev_write = max8998_i2c_device_write; | |
100 | max8998->dev_update = max8998_i2c_device_update; | |
101 | mutex_init(&max8998->iolock); | |
102 | ||
103 | ret = mfd_add_devices(max8998->dev, -1, | |
104 | max8998_devs, ARRAY_SIZE(max8998_devs), | |
105 | NULL, 0); | |
106 | if (ret < 0) | |
107 | goto err; | |
108 | ||
109 | return ret; | |
110 | ||
111 | err: | |
112 | mfd_remove_devices(max8998->dev); | |
113 | kfree(max8998); | |
114 | return ret; | |
115 | } | |
116 | ||
117 | static int max8998_i2c_remove(struct i2c_client *i2c) | |
118 | { | |
119 | struct max8998_dev *max8998 = i2c_get_clientdata(i2c); | |
120 | ||
121 | mfd_remove_devices(max8998->dev); | |
122 | kfree(max8998); | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | static const struct i2c_device_id max8998_i2c_id[] = { | |
128 | { "max8998", 0 }, | |
129 | { } | |
130 | }; | |
131 | MODULE_DEVICE_TABLE(i2c, max8998_i2c_id); | |
132 | ||
133 | static struct i2c_driver max8998_i2c_driver = { | |
134 | .driver = { | |
135 | .name = "max8998", | |
136 | .owner = THIS_MODULE, | |
137 | }, | |
138 | .probe = max8998_i2c_probe, | |
139 | .remove = max8998_i2c_remove, | |
140 | .id_table = max8998_i2c_id, | |
141 | }; | |
142 | ||
143 | static int __init max8998_i2c_init(void) | |
144 | { | |
145 | return i2c_add_driver(&max8998_i2c_driver); | |
146 | } | |
147 | /* init early so consumer devices can complete system boot */ | |
148 | subsys_initcall(max8998_i2c_init); | |
149 | ||
150 | static void __exit max8998_i2c_exit(void) | |
151 | { | |
152 | i2c_del_driver(&max8998_i2c_driver); | |
153 | } | |
154 | module_exit(max8998_i2c_exit); | |
155 | ||
156 | MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver"); | |
157 | MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>"); | |
158 | MODULE_LICENSE("GPL"); |