Linux 3.11-rc3
[cris-mirror.git] / drivers / mfd / tps6507x.c
blob5ad4b772b09797bec97c9759bb9c80e609102651
1 /*
2 * tps6507x.c -- TPS6507x chip family multi-function driver
4 * Copyright (c) 2010 RidgeRun (todd.fischer@ridgerun.com)
6 * Author: Todd Fischer
7 * todd.fischer@ridgerun.com
9 * Credits:
11 * Using code from wm831x-*.c, wm8400-core, Wolfson Microelectronics PLC.
13 * For licencing details see kernel-base/COPYING
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_device.h>
23 #include <linux/mfd/core.h>
24 #include <linux/mfd/tps6507x.h>
26 static struct mfd_cell tps6507x_devs[] = {
28 .name = "tps6507x-pmic",
31 .name = "tps6507x-ts",
36 static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg,
37 int bytes, void *dest)
39 struct i2c_client *i2c = tps6507x->i2c_client;
40 struct i2c_msg xfer[2];
41 int ret;
43 /* Write register */
44 xfer[0].addr = i2c->addr;
45 xfer[0].flags = 0;
46 xfer[0].len = 1;
47 xfer[0].buf = &reg;
49 /* Read data */
50 xfer[1].addr = i2c->addr;
51 xfer[1].flags = I2C_M_RD;
52 xfer[1].len = bytes;
53 xfer[1].buf = dest;
55 ret = i2c_transfer(i2c->adapter, xfer, 2);
56 if (ret == 2)
57 ret = 0;
58 else if (ret >= 0)
59 ret = -EIO;
61 return ret;
64 static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg,
65 int bytes, void *src)
67 struct i2c_client *i2c = tps6507x->i2c_client;
68 /* we add 1 byte for device register */
69 u8 msg[TPS6507X_MAX_REGISTER + 1];
70 int ret;
72 if (bytes > TPS6507X_MAX_REGISTER)
73 return -EINVAL;
75 msg[0] = reg;
76 memcpy(&msg[1], src, bytes);
78 ret = i2c_master_send(i2c, msg, bytes + 1);
79 if (ret < 0)
80 return ret;
81 if (ret != bytes + 1)
82 return -EIO;
83 return 0;
86 static int tps6507x_i2c_probe(struct i2c_client *i2c,
87 const struct i2c_device_id *id)
89 struct tps6507x_dev *tps6507x;
91 tps6507x = devm_kzalloc(&i2c->dev, sizeof(struct tps6507x_dev),
92 GFP_KERNEL);
93 if (tps6507x == NULL)
94 return -ENOMEM;
96 i2c_set_clientdata(i2c, tps6507x);
97 tps6507x->dev = &i2c->dev;
98 tps6507x->i2c_client = i2c;
99 tps6507x->read_dev = tps6507x_i2c_read_device;
100 tps6507x->write_dev = tps6507x_i2c_write_device;
102 return mfd_add_devices(tps6507x->dev, -1, tps6507x_devs,
103 ARRAY_SIZE(tps6507x_devs), NULL, 0, NULL);
106 static int tps6507x_i2c_remove(struct i2c_client *i2c)
108 struct tps6507x_dev *tps6507x = i2c_get_clientdata(i2c);
110 mfd_remove_devices(tps6507x->dev);
111 return 0;
114 static const struct i2c_device_id tps6507x_i2c_id[] = {
115 { "tps6507x", 0 },
118 MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);
120 #ifdef CONFIG_OF
121 static struct of_device_id tps6507x_of_match[] = {
122 {.compatible = "ti,tps6507x", },
125 MODULE_DEVICE_TABLE(of, tps6507x_of_match);
126 #endif
128 static struct i2c_driver tps6507x_i2c_driver = {
129 .driver = {
130 .name = "tps6507x",
131 .owner = THIS_MODULE,
132 .of_match_table = of_match_ptr(tps6507x_of_match),
134 .probe = tps6507x_i2c_probe,
135 .remove = tps6507x_i2c_remove,
136 .id_table = tps6507x_i2c_id,
139 static int __init tps6507x_i2c_init(void)
141 return i2c_add_driver(&tps6507x_i2c_driver);
143 /* init early so consumer devices can complete system boot */
144 subsys_initcall(tps6507x_i2c_init);
146 static void __exit tps6507x_i2c_exit(void)
148 i2c_del_driver(&tps6507x_i2c_driver);
150 module_exit(tps6507x_i2c_exit);
152 MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");
153 MODULE_LICENSE("GPL");