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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 | ||
676e02d7 | 39 | int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest) |
156f2528 | 40 | { |
676e02d7 | 41 | struct max8998_dev *max8998 = i2c_get_clientdata(i2c); |
156f2528 KP |
42 | int ret; |
43 | ||
44 | mutex_lock(&max8998->iolock); | |
676e02d7 | 45 | ret = i2c_smbus_read_byte_data(i2c, reg); |
156f2528 KP |
46 | mutex_unlock(&max8998->iolock); |
47 | if (ret < 0) | |
48 | return ret; | |
49 | ||
50 | ret &= 0xff; | |
51 | *dest = ret; | |
52 | return 0; | |
53 | } | |
676e02d7 | 54 | EXPORT_SYMBOL(max8998_read_reg); |
156f2528 | 55 | |
676e02d7 | 56 | int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value) |
156f2528 | 57 | { |
676e02d7 | 58 | struct max8998_dev *max8998 = i2c_get_clientdata(i2c); |
156f2528 KP |
59 | int ret; |
60 | ||
61 | mutex_lock(&max8998->iolock); | |
676e02d7 | 62 | ret = i2c_smbus_write_byte_data(i2c, reg, value); |
156f2528 KP |
63 | mutex_unlock(&max8998->iolock); |
64 | return ret; | |
65 | } | |
676e02d7 | 66 | EXPORT_SYMBOL(max8998_write_reg); |
156f2528 | 67 | |
676e02d7 | 68 | int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask) |
156f2528 | 69 | { |
676e02d7 | 70 | struct max8998_dev *max8998 = i2c_get_clientdata(i2c); |
156f2528 KP |
71 | int ret; |
72 | ||
73 | mutex_lock(&max8998->iolock); | |
676e02d7 | 74 | ret = i2c_smbus_read_byte_data(i2c, reg); |
156f2528 KP |
75 | if (ret >= 0) { |
76 | u8 old_val = ret & 0xff; | |
77 | u8 new_val = (val & mask) | (old_val & (~mask)); | |
676e02d7 | 78 | ret = i2c_smbus_write_byte_data(i2c, reg, new_val); |
156f2528 KP |
79 | if (ret >= 0) |
80 | ret = 0; | |
81 | } | |
82 | mutex_unlock(&max8998->iolock); | |
83 | return ret; | |
84 | } | |
676e02d7 | 85 | EXPORT_SYMBOL(max8998_update_reg); |
156f2528 KP |
86 | |
87 | static int max8998_i2c_probe(struct i2c_client *i2c, | |
88 | const struct i2c_device_id *id) | |
89 | { | |
90 | struct max8998_dev *max8998; | |
91 | int ret = 0; | |
92 | ||
93 | max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL); | |
8f1f151e | 94 | if (max8998 == NULL) |
156f2528 | 95 | return -ENOMEM; |
156f2528 KP |
96 | |
97 | i2c_set_clientdata(i2c, max8998); | |
98 | max8998->dev = &i2c->dev; | |
676e02d7 | 99 | max8998->i2c = i2c; |
156f2528 KP |
100 | mutex_init(&max8998->iolock); |
101 | ||
102 | ret = mfd_add_devices(max8998->dev, -1, | |
103 | max8998_devs, ARRAY_SIZE(max8998_devs), | |
104 | NULL, 0); | |
105 | if (ret < 0) | |
106 | goto err; | |
107 | ||
108 | return ret; | |
109 | ||
110 | err: | |
111 | mfd_remove_devices(max8998->dev); | |
112 | kfree(max8998); | |
113 | return ret; | |
114 | } | |
115 | ||
116 | static int max8998_i2c_remove(struct i2c_client *i2c) | |
117 | { | |
118 | struct max8998_dev *max8998 = i2c_get_clientdata(i2c); | |
119 | ||
120 | mfd_remove_devices(max8998->dev); | |
121 | kfree(max8998); | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
126 | static const struct i2c_device_id max8998_i2c_id[] = { | |
f8539ddc KP |
127 | { "max8998", 0 }, |
128 | { "lp3974", 0 }, | |
129 | { } | |
156f2528 KP |
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"); |