Merge branch 'printk-rework' into for-linus
[linux-2.6-microblaze.git] / drivers / mfd / tps6507x.c
1 /*
2  * tps6507x.c  --  TPS6507x chip family multi-function driver
3  *
4  *  Copyright (c) 2010 RidgeRun (todd.fischer@ridgerun.com)
5  *
6  * Author: Todd Fischer
7  *         todd.fischer@ridgerun.com
8  *
9  * Credits:
10  *
11  *    Using code from wm831x-*.c, wm8400-core, Wolfson Microelectronics PLC.
12  *
13  * For licencing details see kernel-base/COPYING
14  *
15  */
16
17 #include <linux/module.h>
18 #include <linux/moduleparam.h>
19 #include <linux/init.h>
20 #include <linux/slab.h>
21 #include <linux/i2c.h>
22 #include <linux/of.h>
23 #include <linux/of_device.h>
24 #include <linux/mfd/core.h>
25 #include <linux/mfd/tps6507x.h>
26
27 static const struct mfd_cell tps6507x_devs[] = {
28         {
29                 .name = "tps6507x-pmic",
30         },
31         {
32                 .name = "tps6507x-ts",
33         },
34 };
35
36
37 static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg,
38                                   int bytes, void *dest)
39 {
40         struct i2c_client *i2c = tps6507x->i2c_client;
41         struct i2c_msg xfer[2];
42         int ret;
43
44         /* Write register */
45         xfer[0].addr = i2c->addr;
46         xfer[0].flags = 0;
47         xfer[0].len = 1;
48         xfer[0].buf = &reg;
49
50         /* Read data */
51         xfer[1].addr = i2c->addr;
52         xfer[1].flags = I2C_M_RD;
53         xfer[1].len = bytes;
54         xfer[1].buf = dest;
55
56         ret = i2c_transfer(i2c->adapter, xfer, 2);
57         if (ret == 2)
58                 ret = 0;
59         else if (ret >= 0)
60                 ret = -EIO;
61
62         return ret;
63 }
64
65 static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg,
66                                    int bytes, void *src)
67 {
68         struct i2c_client *i2c = tps6507x->i2c_client;
69         /* we add 1 byte for device register */
70         u8 msg[TPS6507X_MAX_REGISTER + 1];
71         int ret;
72
73         if (bytes > TPS6507X_MAX_REGISTER)
74                 return -EINVAL;
75
76         msg[0] = reg;
77         memcpy(&msg[1], src, bytes);
78
79         ret = i2c_master_send(i2c, msg, bytes + 1);
80         if (ret < 0)
81                 return ret;
82         if (ret != bytes + 1)
83                 return -EIO;
84         return 0;
85 }
86
87 static int tps6507x_i2c_probe(struct i2c_client *i2c,
88                             const struct i2c_device_id *id)
89 {
90         struct tps6507x_dev *tps6507x;
91
92         tps6507x = devm_kzalloc(&i2c->dev, sizeof(struct tps6507x_dev),
93                                 GFP_KERNEL);
94         if (tps6507x == NULL)
95                 return -ENOMEM;
96
97         i2c_set_clientdata(i2c, tps6507x);
98         tps6507x->dev = &i2c->dev;
99         tps6507x->i2c_client = i2c;
100         tps6507x->read_dev = tps6507x_i2c_read_device;
101         tps6507x->write_dev = tps6507x_i2c_write_device;
102
103         return devm_mfd_add_devices(tps6507x->dev, -1, tps6507x_devs,
104                                     ARRAY_SIZE(tps6507x_devs), NULL, 0, NULL);
105 }
106
107 static const struct i2c_device_id tps6507x_i2c_id[] = {
108         { "tps6507x", 0 },
109         { }
110 };
111 MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);
112
113 #ifdef CONFIG_OF
114 static const struct of_device_id tps6507x_of_match[] = {
115         {.compatible = "ti,tps6507x", },
116         {},
117 };
118 MODULE_DEVICE_TABLE(of, tps6507x_of_match);
119 #endif
120
121 static struct i2c_driver tps6507x_i2c_driver = {
122         .driver = {
123                    .name = "tps6507x",
124                    .of_match_table = of_match_ptr(tps6507x_of_match),
125         },
126         .probe = tps6507x_i2c_probe,
127         .id_table = tps6507x_i2c_id,
128 };
129
130 static int __init tps6507x_i2c_init(void)
131 {
132         return i2c_add_driver(&tps6507x_i2c_driver);
133 }
134 /* init early so consumer devices can complete system boot */
135 subsys_initcall(tps6507x_i2c_init);
136
137 static void __exit tps6507x_i2c_exit(void)
138 {
139         i2c_del_driver(&tps6507x_i2c_driver);
140 }
141 module_exit(tps6507x_i2c_exit);
142
143 MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");
144 MODULE_LICENSE("GPL");